| Message ID | 1445871386-2377-1-git-send-email-bharatku@xilinx.com (mailing list archive) |
|---|---|
| State | New, archived |
| Delegated to: | Bjorn Helgaas |
| Headers | show |
On Mon, Oct 26, 2015 at 9:56 AM, Bharat Kumar Gogada <bharat.kumar.gogada@xilinx.com> wrote: > Adding PCIe Root Port driver for Xilinx PCIe NWL bridge IP. > > Signed-off-by: Bharat Kumar Gogada <bharatku@xilinx.com> > Signed-off-by: Ravi Kiran Gummaluri <rgummal@xilinx.com> > --- > Corrected device tree node name. > Made tuples for interrupts, interrupt-map, reg properties. > Added mutex lock in nwl_irq_domain_free function. > Removed unneccessary casts. > --- > .../devicetree/bindings/pci/xilinx-nwl-pcie.txt | 68 ++ > drivers/pci/host/Kconfig | 9 + > drivers/pci/host/Makefile | 1 + > drivers/pci/host/pcie-xilinx-nwl.c | 1057 ++++++++++++++++++++ > 4 files changed, 1135 insertions(+) > create mode 100644 Documentation/devicetree/bindings/pci/xilinx-nwl-pcie.txt > create mode 100644 drivers/pci/host/pcie-xilinx-nwl.c > > diff --git a/Documentation/devicetree/bindings/pci/xilinx-nwl-pcie.txt b/Documentation/devicetree/bindings/pci/xilinx-nwl-pcie.txt > new file mode 100644 > index 0000000..432fa1f > --- /dev/null > +++ b/Documentation/devicetree/bindings/pci/xilinx-nwl-pcie.txt > @@ -0,0 +1,68 @@ > +* Xilinx NWL PCIe Root Port Bridge DT description > + > +Required properties: > +- compatible: Should contain "xlnx,nwl-pcie-2.11" > +- #address-cells: Address representation for root ports, set to <3> > +- #size-cells: Size representation for root ports, set to <2> > +- #interrupt-cells: specifies the number of cells needed to encode an > + interrupt source. The value must be 1. Is this needed since you have the sub-node defining it? > +- reg: Should contain Bridge, PCIe Controller registers location, > + configuration sapce, and length > +- reg-names: Must include the following entries: > + "breg": bridge registers > + "pcireg": PCIe controller registers > + "cfg": configuration space region > +- device_type: must be "pci" > +- interrupts: Should contain NWL PCIe interrupt ...interrupts (add "s") > +- interrupt-names: Must include the following entries: > + "misc": interrupt asserted when miscellaneous is recieved typo > + "intx": interrupt that is asserted when an legacy interrupt is received > + "msi1, msi0": interrupt asserted when msi is recieved typo. Please specify the order of the interrupts. The implied order here doesn't match the example. > +- interrupt-map-mask and interrupt-map: standard PCI properties to define the > + mapping of the PCI interface to interrupt numbers. > +- ranges: ranges for the PCI memory regions (I/O space region is not > + supported by hardware) > + Please refer to the standard PCI bus binding document for a more > + detailed explanation > +- msi-controller: indicates that this is MSI controller node > +- msi-parent: MSI parent of the root complex itself > +- legacy-interrupt-controller: Interrupt controller device node for Legacy interrupts > + - interrupt-controller: identifies the node as an interrupt controller > + - #interrupt-cells: should be set to 1 > + - #address-cells: specifies the number of cells needed to encode an > + address. The value must be 0. > + > + > +Example: > +++++++++ > + > +nwl_pcie: pcie@fd0e0000 { > + #address-cells = <3>; > + #size-cells = <2>; > + compatible = "xlnx,nwl-pcie-2.11"; > + #interrupt-cells = <1>; > + msi-controller; > + device_type = "pci"; > + interrupt-parent = <&gic>; > + interrupts = <0 114 4>, <0 115 4>, <0 116 4>, <0 117 4>, <0 118 4>; > + interrupt-names = "msi0", "msi1", "intx", "dummy", "misc"; > + interrupt-map-mask = <0x0 0x0 0x0 0x7>; > + interrupt-map = <0x0 0x0 0x0 0x1 &pcie_intc 0x1>, > + <0x0 0x0 0x0 0x2 &pcie_intc 0x2>, > + <0x0 0x0 0x0 0x3 &pcie_intc 0x3>, > + <0x0 0x0 0x0 0x4 &pcie_intc 0x4>; > + > + msi-parent = <&nwl_pcie>; > + reg = <0x0 0xfd0e0000 0x1000>, > + <0x0 0xfd480000 0x1000>, > + <0x0 0xe0000000 0x1000000>; > + reg-names = "breg", "pcireg", "cfg"; > + ranges = <0x02000000 0x00000000 0xe1000000 0x00000000 0xe1000000 0 0x0f000000>; > + > + pcie_intc: legacy-interrupt-controller { > + interrupt-controller; > + #address-cells = <0>; > + #interrupt-cells = <1>; > + }; > + > +}; > diff --git a/drivers/pci/host/Kconfig b/drivers/pci/host/Kconfig > index c132bdd..33bbddb 100644 > --- a/drivers/pci/host/Kconfig > +++ b/drivers/pci/host/Kconfig > @@ -15,6 +15,15 @@ config PCI_MVEBU > depends on ARCH_MVEBU || ARCH_DOVE > depends on OF > > +config PCIE_XILINX_NWL > + bool "NWL PCIe Core" > + depends on ARCH_ZYNQMP > + help > + Say 'Y' here if you want kernel to support for Xilinx > + NWL PCIe controller. The controller can act as Root Port > + or End Point. The current option selection will only > + support root port enabling. > + > config PCIE_DW > bool > > diff --git a/drivers/pci/host/Makefile b/drivers/pci/host/Makefile > index 140d66f..6a56df7 100644 > --- a/drivers/pci/host/Makefile > +++ b/drivers/pci/host/Makefile > @@ -10,6 +10,7 @@ obj-$(CONFIG_PCI_HOST_GENERIC) += pci-host-generic.o > obj-$(CONFIG_PCIE_SPEAR13XX) += pcie-spear13xx.o > obj-$(CONFIG_PCI_KEYSTONE) += pci-keystone-dw.o pci-keystone.o > obj-$(CONFIG_PCIE_XILINX) += pcie-xilinx.o > +obj-$(CONFIG_PCIE_XILINX_NWL) += pcie-xilinx-nwl.o > obj-$(CONFIG_PCI_XGENE) += pci-xgene.o > obj-$(CONFIG_PCI_XGENE_MSI) += pci-xgene-msi.o > obj-$(CONFIG_PCI_LAYERSCAPE) += pci-layerscape.o > diff --git a/drivers/pci/host/pcie-xilinx-nwl.c b/drivers/pci/host/pcie-xilinx-nwl.c > new file mode 100644 > index 0000000..ef91a61 > --- /dev/null > +++ b/drivers/pci/host/pcie-xilinx-nwl.c > @@ -0,0 +1,1057 @@ > +/* > + * PCIe host controller driver for NWL PCIe Bridge > + * Based on pcie-xilinx.c, pci-tegra.c > + * > + * (C) Copyright 2014 - 2015, Xilinx, Inc. > + * > + * This program is free software: you can redistribute it and/or modify > + * it under the terms of the GNU General Public License as published by > + * the Free Software Foundation, either version 2 of the License, or > + * (at your option) any later version. > + */ > + > +#include <linux/delay.h> > +#include <linux/interrupt.h> > +#include <linux/irq.h> > +#include <linux/irqdomain.h> > +#include <linux/kernel.h> > +#include <linux/module.h> > +#include <linux/msi.h> > +#include <linux/of_address.h> > +#include <linux/of_pci.h> > +#include <linux/of_platform.h> > +#include <linux/of_irq.h> > +#include <linux/pci.h> > +#include <linux/platform_device.h> > +#include <linux/irqchip/chained_irq.h> > + > +/* Bridge core config registers */ > +#define BRCFG_PCIE_RX0 0x00000000 > +#define BRCFG_PCIE_RX1 0x00000004 > +#define BRCFG_AXI_MASTER 0x00000008 > +#define BRCFG_PCIE_TX 0x0000000C > +#define BRCFG_INTERRUPT 0x00000010 > +#define BRCFG_RAM_DISABLE0 0x00000014 > +#define BRCFG_RAM_DISABLE1 0x00000018 > +#define BRCFG_PCIE_RELAXED_ORDER 0x0000001C > +#define BRCFG_PCIE_RX_MSG_FILTER 0x00000020 > + > +/* Attribute registers */ > +#define NWL_ATTRIB_100 0x00000190 > + > +/* Egress - Bridge translation registers */ > +#define E_BREG_CAPABILITIES 0x00000200 > +#define E_BREG_STATUS 0x00000204 > +#define E_BREG_CONTROL 0x00000208 > +#define E_BREG_BASE_LO 0x00000210 > +#define E_BREG_BASE_HI 0x00000214 > +#define E_ECAM_CAPABILITIES 0x00000220 > +#define E_ECAM_STATUS 0x00000224 > +#define E_ECAM_CONTROL 0x00000228 > +#define E_ECAM_BASE_LO 0x00000230 > +#define E_ECAM_BASE_HI 0x00000234 > + > +/* Ingress - address translations */ > +#define I_MSII_CAPABILITIES 0x00000300 > +#define I_MSII_CONTROL 0x00000308 > +#define I_MSII_BASE_LO 0x00000310 > +#define I_MSII_BASE_HI 0x00000314 > + > +#define I_ISUB_CONTROL 0x000003E8 > +#define SET_ISUB_CONTROL BIT(0) > +/* Rxed msg fifo - Interrupt status registers */ > +#define MSGF_MISC_STATUS 0x00000400 > +#define MSGF_MISC_MASK 0x00000404 > +#define MSGF_LEG_STATUS 0x00000420 > +#define MSGF_LEG_MASK 0x00000424 > +#define MSGF_MSI_STATUS_LO 0x00000440 > +#define MSGF_MSI_STATUS_HI 0x00000444 > +#define MSGF_MSI_MASK_LO 0x00000448 > +#define MSGF_MSI_MASK_HI 0x0000044C > +#define MSGF_RX_FIFO_POP 0x00000484 > +#define MSGF_RX_FIFO_TYPE 0x00000488 > +#define MSGF_RX_FIFO_ADDRLO 0x00000490 > +#define MSGF_RX_FIFO_ADDRHI 0x00000494 > +#define MSGF_RX_FIFO_DATA 0x00000498 > + > +/* Msg filter mask bits */ > +#define CFG_ENABLE_PM_MSG_FWD BIT(1) > +#define CFG_ENABLE_INT_MSG_FWD BIT(2) > +#define CFG_ENABLE_ERR_MSG_FWD BIT(3) > +#define CFG_ENABLE_SLT_MSG_FWD BIT(5) > +#define CFG_ENABLE_VEN_MSG_FWD BIT(7) > +#define CFG_ENABLE_OTH_MSG_FWD BIT(13) > +#define CFG_ENABLE_VEN_MSG_EN BIT(14) > +#define CFG_ENABLE_VEN_MSG_VEN_INV BIT(15) > +#define CFG_ENABLE_VEN_MSG_VEN_ID GENMASK(31, 16) > +#define CFG_ENABLE_MSG_FILTER_MASK (CFG_ENABLE_PM_MSG_FWD | \ > + CFG_ENABLE_INT_MSG_FWD | \ > + CFG_ENABLE_ERR_MSG_FWD | \ > + CFG_ENABLE_SLT_MSG_FWD | \ > + CFG_ENABLE_VEN_MSG_FWD | \ > + CFG_ENABLE_OTH_MSG_FWD | \ > + CFG_ENABLE_VEN_MSG_EN | \ > + CFG_ENABLE_VEN_MSG_VEN_INV | \ > + CFG_ENABLE_VEN_MSG_VEN_ID) > + > +/* Misc interrupt status mask bits */ > +#define MSGF_MISC_SR_RXMSG_AVAIL BIT(0) > +#define MSGF_MISC_SR_RXMSG_OVER BIT(1) > +#define MSGF_MISC_SR_SLAVE_ERR BIT(4) > +#define MSGF_MISC_SR_MASTER_ERR BIT(5) > +#define MSGF_MISC_SR_I_ADDR_ERR BIT(6) > +#define MSGF_MISC_SR_E_ADDR_ERR BIT(7) > + > +#define MSGF_MISC_SR_PCIE_CORE GENMASK(18, 16) > +#define MSGF_MISC_SR_PCIE_CORE_ERR GENMASK(31, 20) > + > +#define MSGF_MISC_SR_MASKALL (MSGF_MISC_SR_RXMSG_AVAIL | \ > + MSGF_MISC_SR_RXMSG_OVER | \ > + MSGF_MISC_SR_SLAVE_ERR | \ > + MSGF_MISC_SR_MASTER_ERR | \ > + MSGF_MISC_SR_I_ADDR_ERR | \ > + MSGF_MISC_SR_E_ADDR_ERR | \ > + MSGF_MISC_SR_PCIE_CORE | \ > + MSGF_MISC_SR_PCIE_CORE_ERR) > + > +/* Message rx fifo type mask bits */ > +#define MSGF_RX_FIFO_TYPE_MSI (1) > +#define MSGF_RX_FIFO_TYPE_TYPE GENMASK(1, 0) > + > +/* Legacy interrupt status mask bits */ > +#define MSGF_LEG_SR_INTA BIT(0) > +#define MSGF_LEG_SR_INTB BIT(1) > +#define MSGF_LEG_SR_INTC BIT(2) > +#define MSGF_LEG_SR_INTD BIT(3) > +#define MSGF_LEG_SR_MASKALL (MSGF_LEG_SR_INTA | MSGF_LEG_SR_INTB | \ > + MSGF_LEG_SR_INTC | MSGF_LEG_SR_INTD) > + > +/* MSI interrupt status mask bits */ > +#define MSGF_MSI_SR_LO_MASK BIT(0) > +#define MSGF_MSI_SR_HI_MASK BIT(0) > + > +#define MSII_PRESENT BIT(0) > +#define MSII_ENABLE BIT(0) > +#define MSII_STATUS_ENABLE BIT(15) > + > +/* Bridge config interrupt mask */ > +#define BRCFG_INTERRUPT_MASK BIT(0) > +#define BREG_PRESENT BIT(0) > +#define BREG_ENABLE BIT(0) > +#define BREG_ENABLE_FORCE BIT(1) > + > +/* E_ECAM status mask bits */ > +#define E_ECAM_PRESENT BIT(0) > +#define E_ECAM_SR_WR_PEND BIT(16) > +#define E_ECAM_SR_RD_PEND BIT(0) > +#define E_ECAM_SR_MASKALL (E_ECAM_SR_WR_PEND | E_ECAM_SR_RD_PEND) > +#define E_ECAM_CR_ENABLE BIT(0) > +#define E_ECAM_SIZE_LOC GENMASK(20, 16) > +#define E_ECAM_SIZE_SHIFT 16 > +#define ECAM_BUS_LOC_SHIFT 20 > +#define ECAM_DEV_LOC_SHIFT 12 > +#define NWL_ECAM_VALUE_DEFAULT 12 > +#define NWL_ECAM_SIZE_MIN 4096 > + > +#define ATTR_UPSTREAM_FACING BIT(6) > +#define CFG_DMA_REG_BAR GENMASK(2, 0) > + > +/* msgf_rx_fifo_pop bits */ > +#define MSGF_RX_FIFO_POP_POP BIT(0) > + > +#define INT_PCI_MSI_NR (2 * 32) > + > +/* Readin the PS_LINKUP */ > +#define PS_LINKUP_OFFSET 0x00000238 > +#define PCIE_PHY_LINKUP_BIT BIT(0) > +#define PHY_RDY_LINKUP_BIT BIT(1) > +#define PCIE_USER_LINKUP 0 > +#define PHY_RDY_LINKUP 1 > +#define LINKUP_ITER_CHECK 5 > + > +/* PCIE Message Request */ > +#define TX_PCIE_MSG 0x00000620 > +#define TX_PCIE_MSG_CNTL 0x00000004 > +#define TX_PCIE_MSG_SPEC_LO 0x00000008 > +#define TX_PCIE_MSG_SPEC_HI 0x0000000C > +#define TX_PCIE_MSG_DATA 0x00000010 > + > +#define MSG_BUSY_BIT BIT(8) > +#define MSG_EXECUTE_BIT BIT(0) > +#define MSG_DONE_BIT BIT(16) > +#define MSG_DONE_STATUS_BIT (BIT(25) | BIT(24)) > +#define RANDOM_DIGIT 0x11223344 > +#define PATTRN_SSLP_TLP 0x01005074 > + > +#define EXP_CAP_BASE 0x60 > + > +/* SSPL ERROR */ > +#define SLVERR 0x02 > +#define DECERR 0x03 > + > +struct nwl_msi { /* struct nwl_msi - MSI information */ > + struct msi_controller msi_chip; /* msi_chip: MSI domain */ > + DECLARE_BITMAP(used, INT_PCI_MSI_NR); /* used: Declare Bitmap > + for MSI */ > + struct irq_domain *dev_domain; /* domain: IRQ domain pointer */ > + unsigned long pages; /* pages: MSI pages */ > + struct mutex lock; /* lock: mutex lock */ > + int irq_msi0; /* irq_msi0: msi0 interrupt number */ > + int irq_msi1; /* irq_msi1: msi1 interrupt number */ > +}; > + > +/** > + * struct nwl_pcie - PCIe port information > + * > + * @dev: Device pointer > + * @breg_base: IO Mapped Bridge Register Base > + * @pcireg_base: IO Mapped PCIe controller attributes > + * @ecam_base: IO Mapped configuration space > + * @phys_breg_base: Physical Bridge Register Base > + * @phys_pcie_reg_base: Physical PCIe Controller Attributes > + * @phys_ecam_base: Physical Configuration Base > + * @breg_size: Bridge Register space > + * @pcie_reg_size: PCIe controller attributes space > + * @ecam_size: PCIe Configuration space > + * @irq_intx: Legacy interrupt number > + * @irq_misc: Misc interrupt number > + * @ecam_value: ECAM value > + * @last_busno: Last Bus number configured > + * @link_up: Link status flag > + * @bus: PCI bus > + * @msi: MSI domain > + * @legacy_irq_domain: IRQ domain pointer > + */ > +struct nwl_pcie { > + struct device *dev; > + void __iomem *breg_base; > + void __iomem *pcireg_base; > + void __iomem *ecam_base; > + u32 phys_breg_base; > + u32 phys_pcie_reg_base; > + u32 phys_ecam_base; > + u32 breg_size; > + u32 pcie_reg_size; > + u32 ecam_size; > + int irq_intx; > + int irq_misc; > + u32 ecam_value; > + u8 last_busno; > + u8 link_up; > + struct pci_bus *bus; > + struct nwl_msi msi; > + struct irq_domain *legacy_irq_domain; > +}; > + > +static inline u32 nwl_bridge_readl(struct nwl_pcie *pcie, u32 off) > +{ > + return readl(pcie->breg_base + off); > +} > + > +static inline void nwl_bridge_writel(struct nwl_pcie *pcie, u32 val, u32 off) > +{ > + writel(val, pcie->breg_base + off); > +} > + > +static inline bool nwl_pcie_link_up(struct nwl_pcie *pcie, u32 check_link_up) > +{ > + unsigned int status = -EINVAL; > + > + if (check_link_up == PCIE_USER_LINKUP) > + status = (readl(pcie->pcireg_base + PS_LINKUP_OFFSET) & > + PCIE_PHY_LINKUP_BIT) ? 1 : 0; > + else if (check_link_up == PHY_RDY_LINKUP) > + status = (readl(pcie->pcireg_base + PS_LINKUP_OFFSET) & > + PHY_RDY_LINKUP_BIT) ? 1 : 0; > + return status; > +} > + > +/** > + * nwl_pcie_get_config_base - Get configuration base > + * > + * @bus: Bus structure of current bus > + * @devfn: Device/function > + * @where: Offset from base > + * > + * Return: Base address of the configuration space needed to be > + * accessed. > + */ > +static void __iomem *nwl_pcie_get_config_base(struct pci_bus *bus, > + unsigned int devfn, > + int where) > +{ > + struct nwl_pcie *pcie = bus->sysdata; > + int relbus; > + > + relbus = (bus->number << ECAM_BUS_LOC_SHIFT) | > + (devfn << ECAM_DEV_LOC_SHIFT); > + > + return pcie->ecam_base + relbus + where; > +} > + > +/** > + * nwl_setup_sspl - Set Slot Power limit > + * > + * @pcie: PCIe port information > + */ > +static int nwl_setup_sspl(struct nwl_pcie *pcie) > +{ > + unsigned int status; > + int retval = 0; > + > + do { > + status = nwl_bridge_readl(pcie, TX_PCIE_MSG) & MSG_BUSY_BIT; > + if (!status) { > + /* > + * Generate the TLP message for a single EP > + * [TODO] Add a multi-endpoint code > + */ > + nwl_bridge_writel(pcie, 0x0, > + TX_PCIE_MSG + TX_PCIE_MSG_CNTL); > + nwl_bridge_writel(pcie, 0x0, > + TX_PCIE_MSG + TX_PCIE_MSG_SPEC_LO); > + nwl_bridge_writel(pcie, 0x0, > + TX_PCIE_MSG + TX_PCIE_MSG_SPEC_HI); > + nwl_bridge_writel(pcie, 0x0, > + TX_PCIE_MSG + TX_PCIE_MSG_DATA); > + /* Pattern to generate SSLP TLP */ > + nwl_bridge_writel(pcie, PATTRN_SSLP_TLP, > + TX_PCIE_MSG + TX_PCIE_MSG_CNTL); > + nwl_bridge_writel(pcie, RANDOM_DIGIT, > + TX_PCIE_MSG + TX_PCIE_MSG_DATA); > + nwl_bridge_writel(pcie, nwl_bridge_readl(pcie, > + TX_PCIE_MSG) | 0x1, TX_PCIE_MSG); > + mdelay(2); > + status = nwl_bridge_readl(pcie, TX_PCIE_MSG) > + & MSG_DONE_BIT; > + if (status) { > + status = nwl_bridge_readl(pcie, TX_PCIE_MSG) > + & MSG_DONE_STATUS_BIT; > + if (status == SLVERR) { > + dev_err(pcie->dev, "AXI slave error"); > + retval = SLVERR; > + } else if (status == DECERR) { > + dev_err(pcie->dev, "AXI Decode error"); > + retval = DECERR; > + } > + } else { > + retval = 1; > + } > + } > + } while (status); > + > + return retval; > +} > + > +/** > + * nwl_nwl_readl_config - Read configuration space > + * > + * @bus: Bus structure of current bus > + * @devfn: Device/function > + * @where: Offset from base > + * @size: Byte/word/dword > + * @val: Value to be read > + * > + * Return: PCIBIOS_SUCCESSFUL on success > + * PCIBIOS_DEVICE_NOT_FOUND on failure. > + */ > +static int nwl_nwl_readl_config(struct pci_bus *bus, > + unsigned int devfn, > + int where, > + int size, > + u32 *val) > +{ > + void __iomem *addr; > + > + if (!bus->number && devfn > 0) { > + *val = 0xFFFFFFFF; > + return PCIBIOS_DEVICE_NOT_FOUND; > + } > + > + addr = nwl_pcie_get_config_base(bus, devfn, where); > + > + switch (size) { > + case 1: > + *val = readb(addr); > + break; > + case 2: > + *val = readw(addr); > + break; > + default: > + *val = readl(addr); > + break; > + } > + return PCIBIOS_SUCCESSFUL; > +} > + > +/** > + * nwl_nwl_writel_config - Write configuration space > + * > + * @bus: Bus structure of current bus > + * @devfn: Device/function > + * @where: Offset from base > + * @size: Byte/word/dword > + * @val: Value to be written to device > + * > + * Return: PCIBIOS_SUCCESSFUL on success, > + * PCIBIOS_DEVICE_NOT_FOUND on failure. > + */ > +static int nwl_nwl_writel_config(struct pci_bus *bus, > + unsigned int devfn, > + int where, > + int size, > + u32 val) > +{ > + void __iomem *addr; > + int retval; > + struct nwl_pcie *pcie = bus->sysdata; > + > + if (!bus->number && devfn > 0) > + return PCIBIOS_DEVICE_NOT_FOUND; > + > + addr = nwl_pcie_get_config_base(bus, devfn, where); > + > + switch (size) { > + case 1: > + writeb(val, addr); > + break; > + case 2: > + writew(val, addr); > + break; > + default: > + writel(val, addr); > + break; > + } > + if (addr == (pcie->ecam_base + EXP_CAP_BASE + PCI_EXP_SLTCAP)) { > + retval = nwl_setup_sspl(pcie); > + if (retval) > + return PCIBIOS_SET_FAILED; > + } > + > + return PCIBIOS_SUCCESSFUL; > +} > + > +/* PCIe operations */ > +static struct pci_ops nwl_pcie_ops = { > + .read = nwl_nwl_readl_config, > + .write = nwl_nwl_writel_config, > +}; > + > +static irqreturn_t nwl_pcie_misc_handler(int irq, void *data) > +{ > + struct nwl_pcie *pcie = data; > + u32 misc_stat; > + > + /* Checking for misc interrupts */ > + misc_stat = nwl_bridge_readl(pcie, MSGF_MISC_STATUS) & > + MSGF_MISC_SR_MASKALL; > + if (!misc_stat) > + return IRQ_NONE; > + > + if (misc_stat & MSGF_MISC_SR_RXMSG_OVER) > + dev_err(pcie->dev, "Received Message FIFO Overflow\n"); > + > + if (misc_stat & MSGF_MISC_SR_SLAVE_ERR) > + dev_err(pcie->dev, "Slave error\n"); > + > + if (misc_stat & MSGF_MISC_SR_MASTER_ERR) > + dev_err(pcie->dev, "Master error\n"); > + > + if (misc_stat & MSGF_MISC_SR_I_ADDR_ERR) > + dev_err(pcie->dev, > + "In Misc Ingress address translation error\n"); > + > + if (misc_stat & MSGF_MISC_SR_E_ADDR_ERR) > + dev_err(pcie->dev, > + "In Misc Egress address translation error\n"); > + > + if (misc_stat & MSGF_MISC_SR_PCIE_CORE_ERR) > + dev_err(pcie->dev, "PCIe Core error\n"); > + > + /* Clear misc interrupt status */ > + nwl_bridge_writel(pcie, misc_stat, MSGF_MISC_STATUS); > + > + return IRQ_HANDLED; > +} > + > +static void nwl_pcie_leg_handler(int irq, struct irq_desc *desc) > +{ > + struct irq_chip *chip = irq_desc_get_chip(desc); > + struct nwl_pcie *pcie; > + unsigned long status; > + u32 bit; > + u32 virq; > + > + chained_irq_enter(chip, desc); > + pcie = irq_desc_get_handler_data(desc); > + > + while ((status = nwl_bridge_readl(pcie, MSGF_LEG_STATUS) & > + MSGF_LEG_SR_MASKALL) != 0) { > + for_each_set_bit(bit, &status, 4) { > + > + virq = irq_find_mapping(pcie->legacy_irq_domain, > + bit + 1); > + if (virq) > + generic_handle_irq(virq); > + } > + } > + > + chained_irq_exit(chip, desc); > + > +} > + > +static void nwl_pcie_msi_handler_high(unsigned int irq, struct irq_desc *desc) > +{ > + struct irq_chip *chip = irq_desc_get_chip(desc); > + struct nwl_pcie *pcie; > + struct nwl_msi *msi; > + unsigned long status; > + u32 bit; > + u32 virq; > + > + chained_irq_enter(chip, desc); > + pcie = irq_desc_get_handler_data(desc); > + msi = &pcie->msi; > + > + while ((status = nwl_bridge_readl(pcie, MSGF_MSI_STATUS_HI)) != 0) { > + for_each_set_bit(bit, &status, 32) { > + nwl_bridge_writel(pcie, 1 << bit, MSGF_MSI_STATUS_HI); > + virq = irq_find_mapping(msi->dev_domain, bit); > + if (virq) > + generic_handle_irq(virq); > + } > + } > + > + chained_irq_exit(chip, desc); > +} > + > + > +static void nwl_pcie_msi_handler_low(unsigned int irq, struct irq_desc *desc) > +{ > + struct irq_chip *chip = irq_desc_get_chip(desc); > + struct nwl_pcie *pcie; > + struct nwl_msi *msi; > + unsigned long status; > + u32 bit; > + u32 virq; > + > + chained_irq_enter(chip, desc); > + pcie = irq_desc_get_handler_data(desc); > + msi = &pcie->msi; > + > + while ((status = nwl_bridge_readl(pcie, MSGF_MSI_STATUS_LO)) != 0) { > + for_each_set_bit(bit, &status, 32) { > + nwl_bridge_writel(pcie, 1 << bit, MSGF_MSI_STATUS_LO); > + virq = irq_find_mapping(msi->dev_domain, bit); > + if (virq) > + generic_handle_irq(virq); > + } > + } > + > + chained_irq_exit(chip, desc); > +} > + > +static int nwl_legacy_map(struct irq_domain *domain, unsigned int irq, > + irq_hw_number_t hwirq) > +{ > + irq_set_chip_and_handler(irq, &dummy_irq_chip, handle_simple_irq); > + irq_set_chip_data(irq, domain->host_data); > + > + return 0; > +} > + > +static const struct irq_domain_ops legacy_domain_ops = { > + .map = nwl_legacy_map, > +}; > + > +#ifdef CONFIG_PCI_MSI > +static struct irq_chip nwl_msi_irq_chip = { > + .name = "nwl_pcie:msi", > + .irq_enable = unmask_msi_irq, > + .irq_disable = mask_msi_irq, > + .irq_mask = mask_msi_irq, > + .irq_unmask = unmask_msi_irq, > + > +}; > + > +static struct msi_domain_info nwl_msi_domain_info = { > + .flags = (MSI_FLAG_USE_DEF_DOM_OPS | MSI_FLAG_USE_DEF_CHIP_OPS), > + .chip = &nwl_msi_irq_chip, > +}; > +#endif > + > +static void nwl_compose_msi_msg(struct irq_data *data, struct msi_msg *msg) > +{ > + struct nwl_pcie *pcie = irq_data_get_irq_chip_data(data); > + struct nwl_msi *msi = &pcie->msi; > + > + msg->address_lo = virt_to_phys((void *)msi->pages); > + msg->address_hi = 0; > + msg->data = data->hwirq; > + > +} > + > +static int nwl_msi_set_affinity(struct irq_data *irq_data, > + const struct cpumask *mask, bool force) > +{ > + return -EINVAL; > +} > + > +static struct irq_chip nwl_irq_chip = { > + .name = "Xilinx MSI", > + .irq_compose_msi_msg = nwl_compose_msi_msg, > + .irq_set_affinity = nwl_msi_set_affinity, > +}; > + > +static int nwl_irq_domain_alloc(struct irq_domain *domain, unsigned int virq, > + unsigned int nr_irqs, void *args) > +{ > + struct nwl_pcie *pcie = domain->host_data; > + struct nwl_msi *msi = &pcie->msi; > + unsigned long bit; > + > + mutex_lock(&msi->lock); > + bit = find_first_zero_bit(msi->used, INT_PCI_MSI_NR); > + if (bit < INT_PCI_MSI_NR) > + set_bit(bit, msi->used); > + else > + bit = -ENOSPC; > + > + mutex_unlock(&msi->lock); > + irq_domain_set_info(domain, virq, bit, &nwl_irq_chip, > + domain->host_data, handle_simple_irq, > + NULL, NULL); > + return 0; > +} > + > +static void nwl_irq_domain_free(struct irq_domain *domain, unsigned int virq, > + unsigned int nr_irqs) > +{ > + struct irq_data *data = irq_domain_get_irq_data(domain, virq); > + struct nwl_pcie *pcie = irq_data_get_irq_chip_data(data); > + struct nwl_msi *msi = &pcie->msi; > + > + mutex_lock(&msi->lock); > + if (!test_bit(data->hwirq, msi->used)) > + dev_err(pcie->dev, "freeing unused MSI %lu\n", data->hwirq); > + else > + clear_bit(data->hwirq, msi->used); > + > + mutex_unlock(&msi->lock); > +} > + > +static const struct irq_domain_ops dev_msi_domain_ops = { > + .alloc = nwl_irq_domain_alloc, > + .free = nwl_irq_domain_free, > +}; > + > +static void nwl_pcie_free_irq_domain(struct nwl_pcie *pcie) > +{ > + int i; > + u32 irq; > + > +#ifdef CONFIG_PCI_MSI > + struct nwl_msi *msi = &pcie->msi; > +#endif > + > + for (i = 0; i < 4; i++) { > + irq = irq_find_mapping(pcie->legacy_irq_domain, i + 1); > + if (irq > 0) > + irq_dispose_mapping(irq); > + } > + > + irq_domain_remove(pcie->legacy_irq_domain); > + > +#ifdef CONFIG_PCI_MSI > + irq_set_chained_handler_and_data(msi->irq_msi0, NULL, NULL); > + irq_set_chained_handler_and_data(msi->irq_msi1, NULL, NULL); > + > + irq_domain_remove(msi->msi_chip.domain); > + irq_domain_remove(msi->dev_domain); > +#endif > + > +} > + > +static int nwl_pcie_init_irq_domain(struct nwl_pcie *pcie) > +{ > + struct device_node *node = pcie->dev->of_node; > + struct device_node *legacy_intc_node; > + > +#ifdef CONFIG_PCI_MSI > + struct nwl_msi *msi = &pcie->msi; > +#endif > + > + legacy_intc_node = of_get_next_child(node, NULL); > + if (!legacy_intc_node) { > + dev_err(pcie->dev, "No legacy intc node found\n"); > + return PTR_ERR(legacy_intc_node); > + } > + > + pcie->legacy_irq_domain = irq_domain_add_linear(legacy_intc_node, 4, > + &legacy_domain_ops, > + pcie); > + > + if (!pcie->legacy_irq_domain) { > + dev_err(pcie->dev, "failed to create IRQ domain\n"); > + return -ENOMEM; > + } > + > +#ifdef CONFIG_PCI_MSI > + msi->dev_domain = irq_domain_add_linear(NULL, INT_PCI_MSI_NR, > + &dev_msi_domain_ops, pcie); > + if (!msi->dev_domain) { > + dev_err(pcie->dev, "failed to create dev IRQ domain\n"); > + return -ENOMEM; > + } > + msi->msi_chip.domain = pci_msi_create_irq_domain(node, > + &nwl_msi_domain_info, > + msi->dev_domain); > + if (!msi->msi_chip.domain) { > + dev_err(pcie->dev, "failed to create msi IRQ domain\n"); > + irq_domain_remove(msi->dev_domain); > + return -ENOMEM; > + } > +#endif > + return 0; > +} > + > +static int nwl_pcie_enable_msi(struct nwl_pcie *pcie, struct pci_bus *bus) > +{ > + struct platform_device *pdev = to_platform_device(pcie->dev); > + struct nwl_msi *msi = &pcie->msi; > + unsigned long base; > + int ret; > + > + mutex_init(&msi->lock); > + > + msi->msi_chip.dev = pcie->dev; > + bus->msi = &msi->msi_chip; > + > + /* Check for msii_present bit */ > + ret = nwl_bridge_readl(pcie, I_MSII_CAPABILITIES) & MSII_PRESENT; > + if (!ret) { > + dev_err(pcie->dev, "MSI not present\n"); > + ret = -EIO; > + goto err; > + } > + > + /* Enable MSII */ > + nwl_bridge_writel(pcie, nwl_bridge_readl(pcie, I_MSII_CONTROL) | > + MSII_ENABLE, I_MSII_CONTROL); > + > + /* Enable MSII status */ > + nwl_bridge_writel(pcie, nwl_bridge_readl(pcie, I_MSII_CONTROL) | > + MSII_STATUS_ENABLE, I_MSII_CONTROL); > + > + /* setup AFI/FPCI range */ > + msi->pages = __get_free_pages(GFP_KERNEL, 0); > + base = virt_to_phys((void *)msi->pages); > + nwl_bridge_writel(pcie, base, I_MSII_BASE_LO); > + nwl_bridge_writel(pcie, 0x0, I_MSII_BASE_HI); > + > + /* Disable high range msi interrupts */ > + nwl_bridge_writel(pcie, (u32)~MSGF_MSI_SR_HI_MASK, MSGF_MSI_MASK_HI); > + > + /* Clear pending high range msi interrupts */ > + nwl_bridge_writel(pcie, nwl_bridge_readl(pcie, MSGF_MSI_STATUS_HI) & > + MSGF_MSI_SR_HI_MASK, MSGF_MSI_STATUS_HI); > + /* Get msi_1 IRQ number */ > + msi->irq_msi1 = platform_get_irq_byname(pdev, "msi1"); > + if (msi->irq_msi1 < 0) { > + dev_err(&pdev->dev, "failed to get IRQ#%d\n", msi->irq_msi1); > + goto err; > + } > + /* Register msi handler */ > + irq_set_chained_handler_and_data(msi->irq_msi1, > + nwl_pcie_msi_handler_high, pcie); > + > + /* Enable all high range msi interrupts */ > + nwl_bridge_writel(pcie, MSGF_MSI_SR_HI_MASK, MSGF_MSI_MASK_HI); > + > + /* Disable low range msi interrupts */ > + nwl_bridge_writel(pcie, (u32)~MSGF_MSI_SR_LO_MASK, MSGF_MSI_MASK_LO); > + > + /* Clear pending low range msi interrupts */ > + nwl_bridge_writel(pcie, nwl_bridge_readl(pcie, MSGF_MSI_STATUS_LO) & > + MSGF_MSI_SR_LO_MASK, MSGF_MSI_STATUS_LO); > + /* Get msi_0 IRQ number */ > + msi->irq_msi0 = platform_get_irq_byname(pdev, "msi0"); > + if (msi->irq_msi0 < 0) { > + dev_err(&pdev->dev, "failed to get IRQ#%d\n", msi->irq_msi0); > + goto err; > + } > + > + /* Register msi handler */ > + irq_set_chained_handler_and_data(msi->irq_msi0, > + nwl_pcie_msi_handler_low, pcie); > + > + /* Enable all low range msi interrupts */ > + nwl_bridge_writel(pcie, MSGF_MSI_SR_LO_MASK, MSGF_MSI_MASK_LO); > + > + return 0; > +err: > + return ret; > +} > + > +static int nwl_pcie_bridge_init(struct nwl_pcie *pcie) > +{ > + struct platform_device *pdev = to_platform_device(pcie->dev); > + u32 breg_val, ecam_val, first_busno = 0; > + int err; > + int check_link_up = 0; > + > + /* Check for BREG present bit */ > + breg_val = nwl_bridge_readl(pcie, E_BREG_CAPABILITIES) & BREG_PRESENT; > + if (!breg_val) { > + dev_err(pcie->dev, "BREG is not present\n"); > + return breg_val; > + } > + /* Write bridge_off to breg base */ > + nwl_bridge_writel(pcie, (u32)(pcie->phys_breg_base), > + E_BREG_BASE_LO); > + > + /* Enable BREG */ > + nwl_bridge_writel(pcie, ~BREG_ENABLE_FORCE & BREG_ENABLE, > + E_BREG_CONTROL); > + > + /* Disable DMA channel registers */ > + nwl_bridge_writel(pcie, nwl_bridge_readl(pcie, BRCFG_PCIE_RX0) | > + CFG_DMA_REG_BAR, BRCFG_PCIE_RX0); > + > + /* Enable the bridge config interrupt */ > + nwl_bridge_writel(pcie, nwl_bridge_readl(pcie, BRCFG_INTERRUPT) | > + BRCFG_INTERRUPT_MASK, BRCFG_INTERRUPT); > + /* Enable Ingress subtractive decode translation */ > + nwl_bridge_writel(pcie, SET_ISUB_CONTROL, I_ISUB_CONTROL); > + > + /* Enable msg filtering details */ > + nwl_bridge_writel(pcie, CFG_ENABLE_MSG_FILTER_MASK, > + BRCFG_PCIE_RX_MSG_FILTER); > + do { > + err = nwl_pcie_link_up(pcie, PHY_RDY_LINKUP); > + if (err != 1) { > + check_link_up++; > + if (check_link_up > LINKUP_ITER_CHECK) > + return -ENODEV; > + mdelay(1000); > + } > + } while (!err); > + > + /* Check for ECAM present bit */ > + ecam_val = nwl_bridge_readl(pcie, E_ECAM_CAPABILITIES) & E_ECAM_PRESENT; > + if (!ecam_val) { > + dev_err(pcie->dev, "ECAM is not present\n"); > + return ecam_val; > + } > + > + /* Enable ECAM */ > + nwl_bridge_writel(pcie, nwl_bridge_readl(pcie, E_ECAM_CONTROL) | > + E_ECAM_CR_ENABLE, E_ECAM_CONTROL); > + /* Write ecam_value on ecam_control */ > + nwl_bridge_writel(pcie, nwl_bridge_readl(pcie, E_ECAM_CONTROL) | > + (pcie->ecam_value << E_ECAM_SIZE_SHIFT), > + E_ECAM_CONTROL); > + /* Write phy_reg_base to ecam base */ > + nwl_bridge_writel(pcie, (u32)pcie->phys_ecam_base, E_ECAM_BASE_LO); > + > + /* Get bus range */ > + ecam_val = nwl_bridge_readl(pcie, E_ECAM_CONTROL); > + pcie->last_busno = (ecam_val & E_ECAM_SIZE_LOC) >> E_ECAM_SIZE_SHIFT; > + /* Write primary, secondary and subordinate bus numbers */ > + ecam_val = first_busno; > + ecam_val |= (first_busno + 1) << 8; > + ecam_val |= (pcie->last_busno << E_ECAM_SIZE_SHIFT); > + writel(ecam_val, (pcie->ecam_base + PCI_PRIMARY_BUS)); > + > + /* Check if PCIe link is up? */ > + pcie->link_up = nwl_pcie_link_up(pcie, PCIE_USER_LINKUP); > + if (!pcie->link_up) > + dev_info(pcie->dev, "Link is DOWN\n"); > + else > + dev_info(pcie->dev, "Link is UP\n"); > + > + /* Disable all misc interrupts */ > + nwl_bridge_writel(pcie, (u32)~MSGF_MISC_SR_MASKALL, MSGF_MISC_MASK); > + > + /* Clear pending misc interrupts */ > + nwl_bridge_writel(pcie, nwl_bridge_readl(pcie, MSGF_MISC_STATUS) & > + MSGF_MISC_SR_MASKALL, MSGF_MISC_STATUS); > + > + /* Get misc IRQ number */ > + pcie->irq_misc = platform_get_irq_byname(pdev, "misc"); > + if (pcie->irq_misc < 0) { > + dev_err(&pdev->dev, "failed to get misc IRQ#%d\n", > + pcie->irq_misc); > + return pcie->irq_misc; > + } > + /* Register misc handler */ > + err = devm_request_irq(pcie->dev, pcie->irq_misc, > + nwl_pcie_misc_handler, IRQF_SHARED, > + "nwl_pcie:misc", pcie); > + if (err) { > + dev_err(pcie->dev, "fail to register misc IRQ#%d\n", > + pcie->irq_misc); > + return err; > + } > + /* Enable all misc interrupts */ > + nwl_bridge_writel(pcie, MSGF_MISC_SR_MASKALL, MSGF_MISC_MASK); > + > + /* Disable all legacy interrupts */ > + nwl_bridge_writel(pcie, (u32)~MSGF_LEG_SR_MASKALL, MSGF_LEG_MASK); > + > + /* Clear pending legacy interrupts */ > + nwl_bridge_writel(pcie, nwl_bridge_readl(pcie, MSGF_LEG_STATUS) & > + MSGF_LEG_SR_MASKALL, MSGF_LEG_STATUS); > + /* Get intx IRQ number */ > + pcie->irq_intx = platform_get_irq_byname(pdev, "intx"); > + if (pcie->irq_intx < 0) { > + dev_err(&pdev->dev, "failed to get intx IRQ#%d\n", > + pcie->irq_intx); > + return pcie->irq_intx; > + } > + > + /* Enable all legacy interrupts */ > + nwl_bridge_writel(pcie, MSGF_LEG_SR_MASKALL, MSGF_LEG_MASK); > + > + return 0; > +} > + > +static int nwl_pcie_parse_dt(struct nwl_pcie *pcie, > + struct platform_device *pdev) > +{ > + struct device_node *node = pcie->dev->of_node; > + struct resource *res; > + const char *type; > + > + /* Check for device type */ > + type = of_get_property(node, "device_type", NULL); > + if (!type || strcmp(type, "pci")) { > + dev_err(pcie->dev, "invalid \"device_type\" %s\n", type); > + return -EINVAL; > + } > + > + res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "breg"); > + pcie->breg_base = devm_ioremap_resource(pcie->dev, res); > + if (IS_ERR(pcie->breg_base)) > + return PTR_ERR(pcie->breg_base); > + pcie->phys_breg_base = res->start; > + > + res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "pcireg"); > + pcie->pcireg_base = devm_ioremap_resource(pcie->dev, res); > + if (IS_ERR(pcie->pcireg_base)) > + return PTR_ERR(pcie->pcireg_base); > + pcie->phys_pcie_reg_base = res->start; > + > + res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "cfg"); > + pcie->ecam_base = devm_ioremap_resource(pcie->dev, res); > + if (IS_ERR(pcie->ecam_base)) > + return PTR_ERR(pcie->ecam_base); > + pcie->phys_ecam_base = res->start; > + > + /* Get intx IRQ number */ > + pcie->irq_intx = platform_get_irq_byname(pdev, "intx"); > + if (pcie->irq_intx < 0) { > + dev_err(&pdev->dev, "failed to get intx IRQ#%d\n", > + pcie->irq_intx); > + return pcie->irq_intx; > + } > + > + /* Register intx handler */ > + irq_set_chained_handler_and_data(pcie->irq_intx, > + nwl_pcie_leg_handler, pcie); > + > + return 0; > +} > + > +static const struct of_device_id nwl_pcie_of_match[] = { > + { .compatible = "xlnx,nwl-pcie-2.11", }, > + {} > +}; > + > +static int nwl_pcie_probe(struct platform_device *pdev) > +{ > + struct device_node *node = pdev->dev.of_node; > + struct nwl_pcie *pcie; > + struct pci_bus *bus; > + int err; > + > + resource_size_t iobase = 0; > + LIST_HEAD(res); > + > + pcie = devm_kzalloc(&pdev->dev, sizeof(*pcie), GFP_KERNEL); > + if (!pcie) > + return -ENOMEM; > + > + pcie->ecam_value = NWL_ECAM_VALUE_DEFAULT; > + > + pcie->dev = &pdev->dev; > + > + err = nwl_pcie_parse_dt(pcie, pdev); > + if (err) { > + dev_err(pcie->dev, "Parsing DT failed\n"); > + return err; > + } > + /* Bridge initialization */ > + err = nwl_pcie_bridge_init(pcie); > + if (err) { > + dev_err(pcie->dev, "HW Initalization failed\n"); > + return err; > + } > + > + err = of_pci_get_host_bridge_resources(node, 0, 0xff, &res, &iobase); > + if (err) { > + pr_err("Getting bridge resources failed\n"); > + return err; > + } > + > + err = nwl_pcie_init_irq_domain(pcie); > + if (err) { > + dev_err(pcie->dev, "Failed creating IRQ Domain\n"); > + return err; > + } > + > + bus = pci_create_root_bus(&pdev->dev, 0, > + &nwl_pcie_ops, pcie, &res); > + if (!bus) > + return -ENOMEM; > + > + /* Enable MSI */ > + if (IS_ENABLED(CONFIG_PCI_MSI)) { > + err = nwl_pcie_enable_msi(pcie, bus); > + if (err < 0) { > + dev_err(&pdev->dev, > + "failed to enable MSI support: %d\n", err); > + return err; > + } > + } > + pci_scan_child_bus(bus); > + pci_assign_unassigned_bus_resources(bus); > + pci_bus_add_devices(bus); > + platform_set_drvdata(pdev, pcie); > + > + return 0; > +} > + > +static int nwl_pcie_remove(struct platform_device *pdev) > +{ > + struct nwl_pcie *pcie = platform_get_drvdata(pdev); > + > + nwl_pcie_free_irq_domain(pcie); > + platform_set_drvdata(pdev, NULL); > + > + return 0; > +} > + > +static struct platform_driver nwl_pcie_driver = { > + .driver = { > + .name = "nwl-pcie", > + .of_match_table = nwl_pcie_of_match, > + }, > + .probe = nwl_pcie_probe, > + .remove = nwl_pcie_remove, > +}; > +module_platform_driver(nwl_pcie_driver); > + > +MODULE_AUTHOR("Xilinx, Inc"); > +MODULE_DESCRIPTION("NWL PCIe driver"); > +MODULE_LICENSE("GPL"); > -- > 2.1.1 -- 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Hi Bharat, On Mon, Oct 26, 2015 at 08:26:26PM +0530, Bharat Kumar Gogada wrote: > Adding PCIe Root Port driver for Xilinx PCIe NWL bridge IP. > > Signed-off-by: Bharat Kumar Gogada <bharatku@xilinx.com> > Signed-off-by: Ravi Kiran Gummaluri <rgummal@xilinx.com> > --- > Corrected device tree node name. > Made tuples for interrupts, interrupt-map, reg properties. > Added mutex lock in nwl_irq_domain_free function. > Removed unneccessary casts. > --- > .../devicetree/bindings/pci/xilinx-nwl-pcie.txt | 68 ++ > drivers/pci/host/Kconfig | 9 + > drivers/pci/host/Makefile | 1 + > drivers/pci/host/pcie-xilinx-nwl.c | 1057 ++++++++++++++++++++ Please update MAINTAINERS, too. > +struct nwl_msi { /* struct nwl_msi - MSI information */ > + struct msi_controller msi_chip; /* msi_chip: MSI domain */ > + DECLARE_BITMAP(used, INT_PCI_MSI_NR); /* used: Declare Bitmap > + for MSI */ > + struct irq_domain *dev_domain; /* domain: IRQ domain pointer */ > + unsigned long pages; /* pages: MSI pages */ > + struct mutex lock; /* lock: mutex lock */ > + int irq_msi0; /* irq_msi0: msi0 interrupt number */ > + int irq_msi1; /* irq_msi1: msi1 interrupt number */ You don't need to repeat the struct or member name in the comment. > + * struct nwl_pcie - PCIe port information > + * > + * @dev: Device pointer > + * @breg_base: IO Mapped Bridge Register Base > + * @pcireg_base: IO Mapped PCIe controller attributes > + * @ecam_base: IO Mapped configuration space > + * @phys_breg_base: Physical Bridge Register Base > + * @phys_pcie_reg_base: Physical PCIe Controller Attributes > + * @phys_ecam_base: Physical Configuration Base > + * @breg_size: Bridge Register space > + * @pcie_reg_size: PCIe controller attributes space > + * @ecam_size: PCIe Configuration space > + * @irq_intx: Legacy interrupt number > + * @irq_misc: Misc interrupt number > + * @ecam_value: ECAM value > + * @last_busno: Last Bus number configured > + * @link_up: Link status flag > + * @bus: PCI bus > + * @msi: MSI domain > + * @legacy_irq_domain: IRQ domain pointer > + */ > +struct nwl_pcie { > + struct device *dev; > + void __iomem *breg_base; > + void __iomem *pcireg_base; > + void __iomem *ecam_base; > + u32 phys_breg_base; > + u32 phys_pcie_reg_base; > + u32 phys_ecam_base; > + u32 breg_size; > + u32 pcie_reg_size; > + u32 ecam_size; > + int irq_intx; > + int irq_misc; > + u32 ecam_value; > + u8 last_busno; > + u8 link_up; > + struct pci_bus *bus; > + struct nwl_msi msi; > + struct irq_domain *legacy_irq_domain; Please put the comments on the same line as the member declaration. You might not even need some of the comments, e.g., "Device pointer" merely restates what we already know from the code without adding anything useful. > +static int nwl_setup_sspl(struct nwl_pcie *pcie) > +{ > + unsigned int status; > + int retval = 0; > + > + do { > + status = nwl_bridge_readl(pcie, TX_PCIE_MSG) & MSG_BUSY_BIT; > + if (!status) { > + /* > + * Generate the TLP message for a single EP > + * [TODO] Add a multi-endpoint code > + */ > + nwl_bridge_writel(pcie, 0x0, > + TX_PCIE_MSG + TX_PCIE_MSG_CNTL); > + nwl_bridge_writel(pcie, 0x0, > + TX_PCIE_MSG + TX_PCIE_MSG_SPEC_LO); > + nwl_bridge_writel(pcie, 0x0, > + TX_PCIE_MSG + TX_PCIE_MSG_SPEC_HI); > + nwl_bridge_writel(pcie, 0x0, > + TX_PCIE_MSG + TX_PCIE_MSG_DATA); > + /* Pattern to generate SSLP TLP */ > + nwl_bridge_writel(pcie, PATTRN_SSLP_TLP, > + TX_PCIE_MSG + TX_PCIE_MSG_CNTL); > + nwl_bridge_writel(pcie, RANDOM_DIGIT, > + TX_PCIE_MSG + TX_PCIE_MSG_DATA); > + nwl_bridge_writel(pcie, nwl_bridge_readl(pcie, > + TX_PCIE_MSG) | 0x1, TX_PCIE_MSG); > + mdelay(2); > + status = nwl_bridge_readl(pcie, TX_PCIE_MSG) > + & MSG_DONE_BIT; > + if (status) { > + status = nwl_bridge_readl(pcie, TX_PCIE_MSG) > + & MSG_DONE_STATUS_BIT; > + if (status == SLVERR) { > + dev_err(pcie->dev, "AXI slave error"); > + retval = SLVERR; > + } else if (status == DECERR) { > + dev_err(pcie->dev, "AXI Decode error"); > + retval = DECERR; > + } > + } else { > + retval = 1; > + } > + } > + } while (status); > + > + return retval; This still seems confusing to me. What about if you made a helper function or two? Having the main body of a function indented two tabs is a good hint that something should be factored out of it. > +static void nwl_pcie_leg_handler(int irq, struct irq_desc *desc) > +{ > + struct irq_chip *chip = irq_desc_get_chip(desc); > + struct nwl_pcie *pcie; > + unsigned long status; > + u32 bit; > + u32 virq; > + > + chained_irq_enter(chip, desc); > + pcie = irq_desc_get_handler_data(desc); > + > + while ((status = nwl_bridge_readl(pcie, MSGF_LEG_STATUS) & > + MSGF_LEG_SR_MASKALL) != 0) { > + for_each_set_bit(bit, &status, 4) { > + > + virq = irq_find_mapping(pcie->legacy_irq_domain, > + bit + 1); > + if (virq) > + generic_handle_irq(virq); > + } > + } > + > + chained_irq_exit(chip, desc); > + Unnecessary newline. > +} > + > +static void nwl_pcie_msi_handler_high(unsigned int irq, struct irq_desc *desc) > +{ > + struct irq_chip *chip = irq_desc_get_chip(desc); > + struct nwl_pcie *pcie; > + struct nwl_msi *msi; > + unsigned long status; > + u32 bit; > + u32 virq; > + > + chained_irq_enter(chip, desc); > + pcie = irq_desc_get_handler_data(desc); > + msi = &pcie->msi; > + > + while ((status = nwl_bridge_readl(pcie, MSGF_MSI_STATUS_HI)) != 0) { > + for_each_set_bit(bit, &status, 32) { > + nwl_bridge_writel(pcie, 1 << bit, MSGF_MSI_STATUS_HI); > + virq = irq_find_mapping(msi->dev_domain, bit); > + if (virq) > + generic_handle_irq(virq); > + } > + } > + > + chained_irq_exit(chip, desc); > +} > + > + > +static void nwl_pcie_msi_handler_low(unsigned int irq, struct irq_desc *desc) > +{ > + struct irq_chip *chip = irq_desc_get_chip(desc); > + struct nwl_pcie *pcie; > + struct nwl_msi *msi; > + unsigned long status; > + u32 bit; > + u32 virq; > + > + chained_irq_enter(chip, desc); > + pcie = irq_desc_get_handler_data(desc); > + msi = &pcie->msi; > + > + while ((status = nwl_bridge_readl(pcie, MSGF_MSI_STATUS_LO)) != 0) { > + for_each_set_bit(bit, &status, 32) { > + nwl_bridge_writel(pcie, 1 << bit, MSGF_MSI_STATUS_LO); > + virq = irq_find_mapping(msi->dev_domain, bit); > + if (virq) > + generic_handle_irq(virq); > + } > + } > + > + chained_irq_exit(chip, desc); > +} These are basically identical. Can you factor them out somehow to avoid repeating the code? > +static void nwl_pcie_free_irq_domain(struct nwl_pcie *pcie) > +{ > + int i; > + u32 irq; > + > +#ifdef CONFIG_PCI_MSI > + struct nwl_msi *msi = &pcie->msi; > +#endif > + > + for (i = 0; i < 4; i++) { > + irq = irq_find_mapping(pcie->legacy_irq_domain, i + 1); > + if (irq > 0) > + irq_dispose_mapping(irq); > + } > + > + irq_domain_remove(pcie->legacy_irq_domain); > + > +#ifdef CONFIG_PCI_MSI > + irq_set_chained_handler_and_data(msi->irq_msi0, NULL, NULL); > + irq_set_chained_handler_and_data(msi->irq_msi1, NULL, NULL); > + > + irq_domain_remove(msi->msi_chip.domain); > + irq_domain_remove(msi->dev_domain); > +#endif > + > +} > + > +static int nwl_pcie_init_irq_domain(struct nwl_pcie *pcie) > +{ > + struct device_node *node = pcie->dev->of_node; > + struct device_node *legacy_intc_node; > + > +#ifdef CONFIG_PCI_MSI > + struct nwl_msi *msi = &pcie->msi; > +#endif > + > + legacy_intc_node = of_get_next_child(node, NULL); > + if (!legacy_intc_node) { > + dev_err(pcie->dev, "No legacy intc node found\n"); > + return PTR_ERR(legacy_intc_node); > + } > + > + pcie->legacy_irq_domain = irq_domain_add_linear(legacy_intc_node, 4, > + &legacy_domain_ops, > + pcie); > + > + if (!pcie->legacy_irq_domain) { > + dev_err(pcie->dev, "failed to create IRQ domain\n"); > + return -ENOMEM; > + } > + > +#ifdef CONFIG_PCI_MSI > + msi->dev_domain = irq_domain_add_linear(NULL, INT_PCI_MSI_NR, > + &dev_msi_domain_ops, pcie); > + if (!msi->dev_domain) { > + dev_err(pcie->dev, "failed to create dev IRQ domain\n"); > + return -ENOMEM; > + } > + msi->msi_chip.domain = pci_msi_create_irq_domain(node, > + &nwl_msi_domain_info, > + msi->dev_domain); > + if (!msi->msi_chip.domain) { > + dev_err(pcie->dev, "failed to create msi IRQ domain\n"); > + irq_domain_remove(msi->dev_domain); > + return -ENOMEM; > + } > +#endif > + return 0; > +} > + > +static int nwl_pcie_enable_msi(struct nwl_pcie *pcie, struct pci_bus *bus) > +{ It looks strange to have all the "#ifdef CONFIG_PCI_MSI" above, and here we have this long MSI-related function without any ifdefs around it. Seems like this should be ifdef'ed also? What about nwl_pcie_msi_handler_high(), nwl_pcie_msi_handler_low(), nwl_compose_msi_msg(), nwl_msi_set_affinity(), etc.? > + struct platform_device *pdev = to_platform_device(pcie->dev); > + struct nwl_msi *msi = &pcie->msi; > + unsigned long base; > + int ret; > + > + mutex_init(&msi->lock); > + > + msi->msi_chip.dev = pcie->dev; > + bus->msi = &msi->msi_chip; > + > + /* Check for msii_present bit */ > + ret = nwl_bridge_readl(pcie, I_MSII_CAPABILITIES) & MSII_PRESENT; > + if (!ret) { > + dev_err(pcie->dev, "MSI not present\n"); > + ret = -EIO; > + goto err; > + } > + > + /* Enable MSII */ > + nwl_bridge_writel(pcie, nwl_bridge_readl(pcie, I_MSII_CONTROL) | > + MSII_ENABLE, I_MSII_CONTROL); > + > + /* Enable MSII status */ > + nwl_bridge_writel(pcie, nwl_bridge_readl(pcie, I_MSII_CONTROL) | > + MSII_STATUS_ENABLE, I_MSII_CONTROL); > + > + /* setup AFI/FPCI range */ > + msi->pages = __get_free_pages(GFP_KERNEL, 0); > + base = virt_to_phys((void *)msi->pages); > + nwl_bridge_writel(pcie, base, I_MSII_BASE_LO); > + nwl_bridge_writel(pcie, 0x0, I_MSII_BASE_HI); > + > + /* Disable high range msi interrupts */ > + nwl_bridge_writel(pcie, (u32)~MSGF_MSI_SR_HI_MASK, MSGF_MSI_MASK_HI); > + > + /* Clear pending high range msi interrupts */ > + nwl_bridge_writel(pcie, nwl_bridge_readl(pcie, MSGF_MSI_STATUS_HI) & > + MSGF_MSI_SR_HI_MASK, MSGF_MSI_STATUS_HI); > + /* Get msi_1 IRQ number */ > + msi->irq_msi1 = platform_get_irq_byname(pdev, "msi1"); > + if (msi->irq_msi1 < 0) { > + dev_err(&pdev->dev, "failed to get IRQ#%d\n", msi->irq_msi1); > + goto err; > + } > + /* Register msi handler */ > + irq_set_chained_handler_and_data(msi->irq_msi1, > + nwl_pcie_msi_handler_high, pcie); > + > + /* Enable all high range msi interrupts */ > + nwl_bridge_writel(pcie, MSGF_MSI_SR_HI_MASK, MSGF_MSI_MASK_HI); > + > + /* Disable low range msi interrupts */ > + nwl_bridge_writel(pcie, (u32)~MSGF_MSI_SR_LO_MASK, MSGF_MSI_MASK_LO); > + > + /* Clear pending low range msi interrupts */ > + nwl_bridge_writel(pcie, nwl_bridge_readl(pcie, MSGF_MSI_STATUS_LO) & > + MSGF_MSI_SR_LO_MASK, MSGF_MSI_STATUS_LO); > + /* Get msi_0 IRQ number */ > + msi->irq_msi0 = platform_get_irq_byname(pdev, "msi0"); > + if (msi->irq_msi0 < 0) { > + dev_err(&pdev->dev, "failed to get IRQ#%d\n", msi->irq_msi0); > + goto err; > + } > + > + /* Register msi handler */ > + irq_set_chained_handler_and_data(msi->irq_msi0, > + nwl_pcie_msi_handler_low, pcie); > + > + /* Enable all low range msi interrupts */ > + nwl_bridge_writel(pcie, MSGF_MSI_SR_LO_MASK, MSGF_MSI_MASK_LO); > + > + return 0; > +err: > + return ret; > +} > ... > + bus = pci_create_root_bus(&pdev->dev, 0, > + &nwl_pcie_ops, pcie, &res); > + if (!bus) > + return -ENOMEM; > + > + /* Enable MSI */ > + if (IS_ENABLED(CONFIG_PCI_MSI)) { > + err = nwl_pcie_enable_msi(pcie, bus); > + if (err < 0) { > + dev_err(&pdev->dev, > + "failed to enable MSI support: %d\n", err); > + return err; > + } > + } > + pci_scan_child_bus(bus); > + pci_assign_unassigned_bus_resources(bus); You should call pcie_bus_configure_settings() here. The fact that the PCI core doesn't do that for you automatically is a deficiency in the core, but we have to do it by hand for now. > + pci_bus_add_devices(bus); > + platform_set_drvdata(pdev, pcie); > + > + return 0; > +} > +MODULE_LICENSE("GPL"); "GPL" is perfectly fine if that's what you want. Most people use "GPL v2" to specify that particular version. Using "GPL" means people can use this code under GPL v1, v2, v3, or possibly other versions. I'm not a lawyer and not offering advice; I'm just checking to make sure this is correct. Bjorn -- To unsubscribe from this list: send the line "unsubscribe linux-pci" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
> On Mon, Oct 26, 2015 at 08:26:26PM +0530, Bharat Kumar Gogada wrote: > > Adding PCIe Root Port driver for Xilinx PCIe NWL bridge IP. > > + > > + while ((status = nwl_bridge_readl(pcie, MSGF_MSI_STATUS_LO)) != > 0) { > > + for_each_set_bit(bit, &status, 32) { > > + nwl_bridge_writel(pcie, 1 << bit, > MSGF_MSI_STATUS_LO); > > + virq = irq_find_mapping(msi->dev_domain, bit); > > + if (virq) > > + generic_handle_irq(virq); > > + } > > + } > > + > > + chained_irq_exit(chip, desc); > > +} > > These are basically identical. Can you factor them out somehow to avoid > repeating the code? Is it okay if irq_set_chained_handler_and_data being invoked with two different interrupt numbers, but pointing to same interrupt handler? > > + > > + pcie->legacy_irq_domain = > irq_domain_add_linear(legacy_intc_node, 4, > > + > &legacy_domain_ops, > > + pcie); > > + > > + if (!pcie->legacy_irq_domain) { > > + dev_err(pcie->dev, "failed to create IRQ domain\n"); > > + return -ENOMEM; > > + } > > + > > +#ifdef CONFIG_PCI_MSI > > + msi->dev_domain = irq_domain_add_linear(NULL, > INT_PCI_MSI_NR, > > + &dev_msi_domain_ops, pcie); > > + if (!msi->dev_domain) { > > + dev_err(pcie->dev, "failed to create dev IRQ domain\n"); > > + return -ENOMEM; > > + } > > + msi->msi_chip.domain = pci_msi_create_irq_domain(node, > > + > &nwl_msi_domain_info, > > + msi->dev_domain); > > + if (!msi->msi_chip.domain) { > > + dev_err(pcie->dev, "failed to create msi IRQ domain\n"); > > + irq_domain_remove(msi->dev_domain); > > + return -ENOMEM; > > + } > > +#endif > > + return 0; > > +} > > + > > +static int nwl_pcie_enable_msi(struct nwl_pcie *pcie, struct pci_bus > > +*bus) { > > It looks strange to have all the "#ifdef CONFIG_PCI_MSI" above, and here > we have this long MSI-related function without any ifdefs around it. Seems > like this should be ifdef'ed also? What about nwl_pcie_msi_handler_high(), > nwl_pcie_msi_handler_low(), nwl_compose_msi_msg(), > nwl_msi_set_affinity(), etc.? > In probe I'm invoking "nwl_pcie_enable_msi" using "if (IS_ENABLED(CONFIG_PCI_MSI)) " check, since this is at run time I haven't kept above mentioned functions under #ifdef CONFIG_PCI_MSI. The above MSI domain allocation was under ifdef, since if driver was compiled for legacy some of the MSI hierarchy API's and structures aren't available. > > + struct platform_device *pdev = to_platform_device(pcie->dev); > > + struct nwl_msi *msi = &pcie->msi; Regards, Bharat -- To unsubscribe from this list: send the line "unsubscribe linux-pci" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
On Wed, Oct 28, 2015 at 10:17:22AM +0000, Bharat Kumar Gogada wrote: > > On Mon, Oct 26, 2015 at 08:26:26PM +0530, Bharat Kumar Gogada wrote: > > > Adding PCIe Root Port driver for Xilinx PCIe NWL bridge IP. > > > > + > > > + while ((status = nwl_bridge_readl(pcie, MSGF_MSI_STATUS_LO)) != > > 0) { > > > + for_each_set_bit(bit, &status, 32) { > > > + nwl_bridge_writel(pcie, 1 << bit, > > MSGF_MSI_STATUS_LO); > > > + virq = irq_find_mapping(msi->dev_domain, bit); > > > + if (virq) > > > + generic_handle_irq(virq); > > > + } > > > + } > > > + > > > + chained_irq_exit(chip, desc); > > > +} > > > > These are basically identical. Can you factor them out somehow to avoid > > repeating the code? > > Is it okay if irq_set_chained_handler_and_data being invoked with two different interrupt numbers, but pointing to > same interrupt handler? Yes, that should be fine. > > > + > > > + pcie->legacy_irq_domain = > > irq_domain_add_linear(legacy_intc_node, 4, > > > + > > &legacy_domain_ops, > > > + pcie); > > > + > > > + if (!pcie->legacy_irq_domain) { > > > + dev_err(pcie->dev, "failed to create IRQ domain\n"); > > > + return -ENOMEM; > > > + } > > > + > > > +#ifdef CONFIG_PCI_MSI > > > + msi->dev_domain = irq_domain_add_linear(NULL, > > INT_PCI_MSI_NR, > > > + &dev_msi_domain_ops, pcie); > > > + if (!msi->dev_domain) { > > > + dev_err(pcie->dev, "failed to create dev IRQ domain\n"); > > > + return -ENOMEM; > > > + } > > > + msi->msi_chip.domain = pci_msi_create_irq_domain(node, > > > + > > &nwl_msi_domain_info, > > > + msi->dev_domain); > > > + if (!msi->msi_chip.domain) { > > > + dev_err(pcie->dev, "failed to create msi IRQ domain\n"); > > > + irq_domain_remove(msi->dev_domain); > > > + return -ENOMEM; > > > + } > > > +#endif > > > + return 0; > > > +} > > > + > > > +static int nwl_pcie_enable_msi(struct nwl_pcie *pcie, struct pci_bus > > > +*bus) { > > > > It looks strange to have all the "#ifdef CONFIG_PCI_MSI" above, and here > > we have this long MSI-related function without any ifdefs around it. Seems > > like this should be ifdef'ed also? What about nwl_pcie_msi_handler_high(), > > nwl_pcie_msi_handler_low(), nwl_compose_msi_msg(), > > nwl_msi_set_affinity(), etc.? > > > In probe I'm invoking "nwl_pcie_enable_msi" using "if (IS_ENABLED(CONFIG_PCI_MSI)) " check, since this is at run time > I haven't kept above mentioned functions under #ifdef CONFIG_PCI_MSI. > The above MSI domain allocation was under ifdef, since if driver was compiled for legacy some of the MSI hierarchy API's and structures aren't available. OK. It *looks* strange, but maybe it's the best we can do. I'm not enamored of IS_ENABLED() thing yet; I guess I just haven't internalized the combination compile-time and run-time behavior. Bjorn -- To unsubscribe from this list: send the line "unsubscribe linux-pci" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
diff --git a/Documentation/devicetree/bindings/pci/xilinx-nwl-pcie.txt b/Documentation/devicetree/bindings/pci/xilinx-nwl-pcie.txt new file mode 100644 index 0000000..432fa1f --- /dev/null +++ b/Documentation/devicetree/bindings/pci/xilinx-nwl-pcie.txt @@ -0,0 +1,68 @@ +* Xilinx NWL PCIe Root Port Bridge DT description + +Required properties: +- compatible: Should contain "xlnx,nwl-pcie-2.11" +- #address-cells: Address representation for root ports, set to <3> +- #size-cells: Size representation for root ports, set to <2> +- #interrupt-cells: specifies the number of cells needed to encode an + interrupt source. The value must be 1. +- reg: Should contain Bridge, PCIe Controller registers location, + configuration sapce, and length +- reg-names: Must include the following entries: + "breg": bridge registers + "pcireg": PCIe controller registers + "cfg": configuration space region +- device_type: must be "pci" +- interrupts: Should contain NWL PCIe interrupt +- interrupt-names: Must include the following entries: + "misc": interrupt asserted when miscellaneous is recieved + "intx": interrupt that is asserted when an legacy interrupt is received + "msi1, msi0": interrupt asserted when msi is recieved +- interrupt-map-mask and interrupt-map: standard PCI properties to define the + mapping of the PCI interface to interrupt numbers. +- ranges: ranges for the PCI memory regions (I/O space region is not + supported by hardware) + Please refer to the standard PCI bus binding document for a more + detailed explanation +- msi-controller: indicates that this is MSI controller node +- msi-parent: MSI parent of the root complex itself +- legacy-interrupt-controller: Interrupt controller device node for Legacy interrupts + - interrupt-controller: identifies the node as an interrupt controller + - #interrupt-cells: should be set to 1 + - #address-cells: specifies the number of cells needed to encode an + address. The value must be 0. + + +Example: +++++++++ + +nwl_pcie: pcie@fd0e0000 { + #address-cells = <3>; + #size-cells = <2>; + compatible = "xlnx,nwl-pcie-2.11"; + #interrupt-cells = <1>; + msi-controller; + device_type = "pci"; + interrupt-parent = <&gic>; + interrupts = <0 114 4>, <0 115 4>, <0 116 4>, <0 117 4>, <0 118 4>; + interrupt-names = "msi0", "msi1", "intx", "dummy", "misc"; + interrupt-map-mask = <0x0 0x0 0x0 0x7>; + interrupt-map = <0x0 0x0 0x0 0x1 &pcie_intc 0x1>, + <0x0 0x0 0x0 0x2 &pcie_intc 0x2>, + <0x0 0x0 0x0 0x3 &pcie_intc 0x3>, + <0x0 0x0 0x0 0x4 &pcie_intc 0x4>; + + msi-parent = <&nwl_pcie>; + reg = <0x0 0xfd0e0000 0x1000>, + <0x0 0xfd480000 0x1000>, + <0x0 0xe0000000 0x1000000>; + reg-names = "breg", "pcireg", "cfg"; + ranges = <0x02000000 0x00000000 0xe1000000 0x00000000 0xe1000000 0 0x0f000000>; + + pcie_intc: legacy-interrupt-controller { + interrupt-controller; + #address-cells = <0>; + #interrupt-cells = <1>; + }; + +}; diff --git a/drivers/pci/host/Kconfig b/drivers/pci/host/Kconfig index c132bdd..33bbddb 100644 --- a/drivers/pci/host/Kconfig +++ b/drivers/pci/host/Kconfig @@ -15,6 +15,15 @@ config PCI_MVEBU depends on ARCH_MVEBU || ARCH_DOVE depends on OF +config PCIE_XILINX_NWL + bool "NWL PCIe Core" + depends on ARCH_ZYNQMP + help + Say 'Y' here if you want kernel to support for Xilinx + NWL PCIe controller. The controller can act as Root Port + or End Point. The current option selection will only + support root port enabling. + config PCIE_DW bool diff --git a/drivers/pci/host/Makefile b/drivers/pci/host/Makefile index 140d66f..6a56df7 100644 --- a/drivers/pci/host/Makefile +++ b/drivers/pci/host/Makefile @@ -10,6 +10,7 @@ obj-$(CONFIG_PCI_HOST_GENERIC) += pci-host-generic.o obj-$(CONFIG_PCIE_SPEAR13XX) += pcie-spear13xx.o obj-$(CONFIG_PCI_KEYSTONE) += pci-keystone-dw.o pci-keystone.o obj-$(CONFIG_PCIE_XILINX) += pcie-xilinx.o +obj-$(CONFIG_PCIE_XILINX_NWL) += pcie-xilinx-nwl.o obj-$(CONFIG_PCI_XGENE) += pci-xgene.o obj-$(CONFIG_PCI_XGENE_MSI) += pci-xgene-msi.o obj-$(CONFIG_PCI_LAYERSCAPE) += pci-layerscape.o diff --git a/drivers/pci/host/pcie-xilinx-nwl.c b/drivers/pci/host/pcie-xilinx-nwl.c new file mode 100644 index 0000000..ef91a61 --- /dev/null +++ b/drivers/pci/host/pcie-xilinx-nwl.c @@ -0,0 +1,1057 @@ +/* + * PCIe host controller driver for NWL PCIe Bridge + * Based on pcie-xilinx.c, pci-tegra.c + * + * (C) Copyright 2014 - 2015, Xilinx, Inc. + * + * This program is free software: you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation, either version 2 of the License, or + * (at your option) any later version. + */ + +#include <linux/delay.h> +#include <linux/interrupt.h> +#include <linux/irq.h> +#include <linux/irqdomain.h> +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/msi.h> +#include <linux/of_address.h> +#include <linux/of_pci.h> +#include <linux/of_platform.h> +#include <linux/of_irq.h> +#include <linux/pci.h> +#include <linux/platform_device.h> +#include <linux/irqchip/chained_irq.h> + +/* Bridge core config registers */ +#define BRCFG_PCIE_RX0 0x00000000 +#define BRCFG_PCIE_RX1 0x00000004 +#define BRCFG_AXI_MASTER 0x00000008 +#define BRCFG_PCIE_TX 0x0000000C +#define BRCFG_INTERRUPT 0x00000010 +#define BRCFG_RAM_DISABLE0 0x00000014 +#define BRCFG_RAM_DISABLE1 0x00000018 +#define BRCFG_PCIE_RELAXED_ORDER 0x0000001C +#define BRCFG_PCIE_RX_MSG_FILTER 0x00000020 + +/* Attribute registers */ +#define NWL_ATTRIB_100 0x00000190 + +/* Egress - Bridge translation registers */ +#define E_BREG_CAPABILITIES 0x00000200 +#define E_BREG_STATUS 0x00000204 +#define E_BREG_CONTROL 0x00000208 +#define E_BREG_BASE_LO 0x00000210 +#define E_BREG_BASE_HI 0x00000214 +#define E_ECAM_CAPABILITIES 0x00000220 +#define E_ECAM_STATUS 0x00000224 +#define E_ECAM_CONTROL 0x00000228 +#define E_ECAM_BASE_LO 0x00000230 +#define E_ECAM_BASE_HI 0x00000234 + +/* Ingress - address translations */ +#define I_MSII_CAPABILITIES 0x00000300 +#define I_MSII_CONTROL 0x00000308 +#define I_MSII_BASE_LO 0x00000310 +#define I_MSII_BASE_HI 0x00000314 + +#define I_ISUB_CONTROL 0x000003E8 +#define SET_ISUB_CONTROL BIT(0) +/* Rxed msg fifo - Interrupt status registers */ +#define MSGF_MISC_STATUS 0x00000400 +#define MSGF_MISC_MASK 0x00000404 +#define MSGF_LEG_STATUS 0x00000420 +#define MSGF_LEG_MASK 0x00000424 +#define MSGF_MSI_STATUS_LO 0x00000440 +#define MSGF_MSI_STATUS_HI 0x00000444 +#define MSGF_MSI_MASK_LO 0x00000448 +#define MSGF_MSI_MASK_HI 0x0000044C +#define MSGF_RX_FIFO_POP 0x00000484 +#define MSGF_RX_FIFO_TYPE 0x00000488 +#define MSGF_RX_FIFO_ADDRLO 0x00000490 +#define MSGF_RX_FIFO_ADDRHI 0x00000494 +#define MSGF_RX_FIFO_DATA 0x00000498 + +/* Msg filter mask bits */ +#define CFG_ENABLE_PM_MSG_FWD BIT(1) +#define CFG_ENABLE_INT_MSG_FWD BIT(2) +#define CFG_ENABLE_ERR_MSG_FWD BIT(3) +#define CFG_ENABLE_SLT_MSG_FWD BIT(5) +#define CFG_ENABLE_VEN_MSG_FWD BIT(7) +#define CFG_ENABLE_OTH_MSG_FWD BIT(13) +#define CFG_ENABLE_VEN_MSG_EN BIT(14) +#define CFG_ENABLE_VEN_MSG_VEN_INV BIT(15) +#define CFG_ENABLE_VEN_MSG_VEN_ID GENMASK(31, 16) +#define CFG_ENABLE_MSG_FILTER_MASK (CFG_ENABLE_PM_MSG_FWD | \ + CFG_ENABLE_INT_MSG_FWD | \ + CFG_ENABLE_ERR_MSG_FWD | \ + CFG_ENABLE_SLT_MSG_FWD | \ + CFG_ENABLE_VEN_MSG_FWD | \ + CFG_ENABLE_OTH_MSG_FWD | \ + CFG_ENABLE_VEN_MSG_EN | \ + CFG_ENABLE_VEN_MSG_VEN_INV | \ + CFG_ENABLE_VEN_MSG_VEN_ID) + +/* Misc interrupt status mask bits */ +#define MSGF_MISC_SR_RXMSG_AVAIL BIT(0) +#define MSGF_MISC_SR_RXMSG_OVER BIT(1) +#define MSGF_MISC_SR_SLAVE_ERR BIT(4) +#define MSGF_MISC_SR_MASTER_ERR BIT(5) +#define MSGF_MISC_SR_I_ADDR_ERR BIT(6) +#define MSGF_MISC_SR_E_ADDR_ERR BIT(7) + +#define MSGF_MISC_SR_PCIE_CORE GENMASK(18, 16) +#define MSGF_MISC_SR_PCIE_CORE_ERR GENMASK(31, 20) + +#define MSGF_MISC_SR_MASKALL (MSGF_MISC_SR_RXMSG_AVAIL | \ + MSGF_MISC_SR_RXMSG_OVER | \ + MSGF_MISC_SR_SLAVE_ERR | \ + MSGF_MISC_SR_MASTER_ERR | \ + MSGF_MISC_SR_I_ADDR_ERR | \ + MSGF_MISC_SR_E_ADDR_ERR | \ + MSGF_MISC_SR_PCIE_CORE | \ + MSGF_MISC_SR_PCIE_CORE_ERR) + +/* Message rx fifo type mask bits */ +#define MSGF_RX_FIFO_TYPE_MSI (1) +#define MSGF_RX_FIFO_TYPE_TYPE GENMASK(1, 0) + +/* Legacy interrupt status mask bits */ +#define MSGF_LEG_SR_INTA BIT(0) +#define MSGF_LEG_SR_INTB BIT(1) +#define MSGF_LEG_SR_INTC BIT(2) +#define MSGF_LEG_SR_INTD BIT(3) +#define MSGF_LEG_SR_MASKALL (MSGF_LEG_SR_INTA | MSGF_LEG_SR_INTB | \ + MSGF_LEG_SR_INTC | MSGF_LEG_SR_INTD) + +/* MSI interrupt status mask bits */ +#define MSGF_MSI_SR_LO_MASK BIT(0) +#define MSGF_MSI_SR_HI_MASK BIT(0) + +#define MSII_PRESENT BIT(0) +#define MSII_ENABLE BIT(0) +#define MSII_STATUS_ENABLE BIT(15) + +/* Bridge config interrupt mask */ +#define BRCFG_INTERRUPT_MASK BIT(0) +#define BREG_PRESENT BIT(0) +#define BREG_ENABLE BIT(0) +#define BREG_ENABLE_FORCE BIT(1) + +/* E_ECAM status mask bits */ +#define E_ECAM_PRESENT BIT(0) +#define E_ECAM_SR_WR_PEND BIT(16) +#define E_ECAM_SR_RD_PEND BIT(0) +#define E_ECAM_SR_MASKALL (E_ECAM_SR_WR_PEND | E_ECAM_SR_RD_PEND) +#define E_ECAM_CR_ENABLE BIT(0) +#define E_ECAM_SIZE_LOC GENMASK(20, 16) +#define E_ECAM_SIZE_SHIFT 16 +#define ECAM_BUS_LOC_SHIFT 20 +#define ECAM_DEV_LOC_SHIFT 12 +#define NWL_ECAM_VALUE_DEFAULT 12 +#define NWL_ECAM_SIZE_MIN 4096 + +#define ATTR_UPSTREAM_FACING BIT(6) +#define CFG_DMA_REG_BAR GENMASK(2, 0) + +/* msgf_rx_fifo_pop bits */ +#define MSGF_RX_FIFO_POP_POP BIT(0) + +#define INT_PCI_MSI_NR (2 * 32) + +/* Readin the PS_LINKUP */ +#define PS_LINKUP_OFFSET 0x00000238 +#define PCIE_PHY_LINKUP_BIT BIT(0) +#define PHY_RDY_LINKUP_BIT BIT(1) +#define PCIE_USER_LINKUP 0 +#define PHY_RDY_LINKUP 1 +#define LINKUP_ITER_CHECK 5 + +/* PCIE Message Request */ +#define TX_PCIE_MSG 0x00000620 +#define TX_PCIE_MSG_CNTL 0x00000004 +#define TX_PCIE_MSG_SPEC_LO 0x00000008 +#define TX_PCIE_MSG_SPEC_HI 0x0000000C +#define TX_PCIE_MSG_DATA 0x00000010 + +#define MSG_BUSY_BIT BIT(8) +#define MSG_EXECUTE_BIT BIT(0) +#define MSG_DONE_BIT BIT(16) +#define MSG_DONE_STATUS_BIT (BIT(25) | BIT(24)) +#define RANDOM_DIGIT 0x11223344 +#define PATTRN_SSLP_TLP 0x01005074 + +#define EXP_CAP_BASE 0x60 + +/* SSPL ERROR */ +#define SLVERR 0x02 +#define DECERR 0x03 + +struct nwl_msi { /* struct nwl_msi - MSI information */ + struct msi_controller msi_chip; /* msi_chip: MSI domain */ + DECLARE_BITMAP(used, INT_PCI_MSI_NR); /* used: Declare Bitmap + for MSI */ + struct irq_domain *dev_domain; /* domain: IRQ domain pointer */ + unsigned long pages; /* pages: MSI pages */ + struct mutex lock; /* lock: mutex lock */ + int irq_msi0; /* irq_msi0: msi0 interrupt number */ + int irq_msi1; /* irq_msi1: msi1 interrupt number */ +}; + +/** + * struct nwl_pcie - PCIe port information + * + * @dev: Device pointer + * @breg_base: IO Mapped Bridge Register Base + * @pcireg_base: IO Mapped PCIe controller attributes + * @ecam_base: IO Mapped configuration space + * @phys_breg_base: Physical Bridge Register Base + * @phys_pcie_reg_base: Physical PCIe Controller Attributes + * @phys_ecam_base: Physical Configuration Base + * @breg_size: Bridge Register space + * @pcie_reg_size: PCIe controller attributes space + * @ecam_size: PCIe Configuration space + * @irq_intx: Legacy interrupt number + * @irq_misc: Misc interrupt number + * @ecam_value: ECAM value + * @last_busno: Last Bus number configured + * @link_up: Link status flag + * @bus: PCI bus + * @msi: MSI domain + * @legacy_irq_domain: IRQ domain pointer + */ +struct nwl_pcie { + struct device *dev; + void __iomem *breg_base; + void __iomem *pcireg_base; + void __iomem *ecam_base; + u32 phys_breg_base; + u32 phys_pcie_reg_base; + u32 phys_ecam_base; + u32 breg_size; + u32 pcie_reg_size; + u32 ecam_size; + int irq_intx; + int irq_misc; + u32 ecam_value; + u8 last_busno; + u8 link_up; + struct pci_bus *bus; + struct nwl_msi msi; + struct irq_domain *legacy_irq_domain; +}; + +static inline u32 nwl_bridge_readl(struct nwl_pcie *pcie, u32 off) +{ + return readl(pcie->breg_base + off); +} + +static inline void nwl_bridge_writel(struct nwl_pcie *pcie, u32 val, u32 off) +{ + writel(val, pcie->breg_base + off); +} + +static inline bool nwl_pcie_link_up(struct nwl_pcie *pcie, u32 check_link_up) +{ + unsigned int status = -EINVAL; + + if (check_link_up == PCIE_USER_LINKUP) + status = (readl(pcie->pcireg_base + PS_LINKUP_OFFSET) & + PCIE_PHY_LINKUP_BIT) ? 1 : 0; + else if (check_link_up == PHY_RDY_LINKUP) + status = (readl(pcie->pcireg_base + PS_LINKUP_OFFSET) & + PHY_RDY_LINKUP_BIT) ? 1 : 0; + return status; +} + +/** + * nwl_pcie_get_config_base - Get configuration base + * + * @bus: Bus structure of current bus + * @devfn: Device/function + * @where: Offset from base + * + * Return: Base address of the configuration space needed to be + * accessed. + */ +static void __iomem *nwl_pcie_get_config_base(struct pci_bus *bus, + unsigned int devfn, + int where) +{ + struct nwl_pcie *pcie = bus->sysdata; + int relbus; + + relbus = (bus->number << ECAM_BUS_LOC_SHIFT) | + (devfn << ECAM_DEV_LOC_SHIFT); + + return pcie->ecam_base + relbus + where; +} + +/** + * nwl_setup_sspl - Set Slot Power limit + * + * @pcie: PCIe port information + */ +static int nwl_setup_sspl(struct nwl_pcie *pcie) +{ + unsigned int status; + int retval = 0; + + do { + status = nwl_bridge_readl(pcie, TX_PCIE_MSG) & MSG_BUSY_BIT; + if (!status) { + /* + * Generate the TLP message for a single EP + * [TODO] Add a multi-endpoint code + */ + nwl_bridge_writel(pcie, 0x0, + TX_PCIE_MSG + TX_PCIE_MSG_CNTL); + nwl_bridge_writel(pcie, 0x0, + TX_PCIE_MSG + TX_PCIE_MSG_SPEC_LO); + nwl_bridge_writel(pcie, 0x0, + TX_PCIE_MSG + TX_PCIE_MSG_SPEC_HI); + nwl_bridge_writel(pcie, 0x0, + TX_PCIE_MSG + TX_PCIE_MSG_DATA); + /* Pattern to generate SSLP TLP */ + nwl_bridge_writel(pcie, PATTRN_SSLP_TLP, + TX_PCIE_MSG + TX_PCIE_MSG_CNTL); + nwl_bridge_writel(pcie, RANDOM_DIGIT, + TX_PCIE_MSG + TX_PCIE_MSG_DATA); + nwl_bridge_writel(pcie, nwl_bridge_readl(pcie, + TX_PCIE_MSG) | 0x1, TX_PCIE_MSG); + mdelay(2); + status = nwl_bridge_readl(pcie, TX_PCIE_MSG) + & MSG_DONE_BIT; + if (status) { + status = nwl_bridge_readl(pcie, TX_PCIE_MSG) + & MSG_DONE_STATUS_BIT; + if (status == SLVERR) { + dev_err(pcie->dev, "AXI slave error"); + retval = SLVERR; + } else if (status == DECERR) { + dev_err(pcie->dev, "AXI Decode error"); + retval = DECERR; + } + } else { + retval = 1; + } + } + } while (status); + + return retval; +} + +/** + * nwl_nwl_readl_config - Read configuration space + * + * @bus: Bus structure of current bus + * @devfn: Device/function + * @where: Offset from base + * @size: Byte/word/dword + * @val: Value to be read + * + * Return: PCIBIOS_SUCCESSFUL on success + * PCIBIOS_DEVICE_NOT_FOUND on failure. + */ +static int nwl_nwl_readl_config(struct pci_bus *bus, + unsigned int devfn, + int where, + int size, + u32 *val) +{ + void __iomem *addr; + + if (!bus->number && devfn > 0) { + *val = 0xFFFFFFFF; + return PCIBIOS_DEVICE_NOT_FOUND; + } + + addr = nwl_pcie_get_config_base(bus, devfn, where); + + switch (size) { + case 1: + *val = readb(addr); + break; + case 2: + *val = readw(addr); + break; + default: + *val = readl(addr); + break; + } + return PCIBIOS_SUCCESSFUL; +} + +/** + * nwl_nwl_writel_config - Write configuration space + * + * @bus: Bus structure of current bus + * @devfn: Device/function + * @where: Offset from base + * @size: Byte/word/dword + * @val: Value to be written to device + * + * Return: PCIBIOS_SUCCESSFUL on success, + * PCIBIOS_DEVICE_NOT_FOUND on failure. + */ +static int nwl_nwl_writel_config(struct pci_bus *bus, + unsigned int devfn, + int where, + int size, + u32 val) +{ + void __iomem *addr; + int retval; + struct nwl_pcie *pcie = bus->sysdata; + + if (!bus->number && devfn > 0) + return PCIBIOS_DEVICE_NOT_FOUND; + + addr = nwl_pcie_get_config_base(bus, devfn, where); + + switch (size) { + case 1: + writeb(val, addr); + break; + case 2: + writew(val, addr); + break; + default: + writel(val, addr); + break; + } + if (addr == (pcie->ecam_base + EXP_CAP_BASE + PCI_EXP_SLTCAP)) { + retval = nwl_setup_sspl(pcie); + if (retval) + return PCIBIOS_SET_FAILED; + } + + return PCIBIOS_SUCCESSFUL; +} + +/* PCIe operations */ +static struct pci_ops nwl_pcie_ops = { + .read = nwl_nwl_readl_config, + .write = nwl_nwl_writel_config, +}; + +static irqreturn_t nwl_pcie_misc_handler(int irq, void *data) +{ + struct nwl_pcie *pcie = data; + u32 misc_stat; + + /* Checking for misc interrupts */ + misc_stat = nwl_bridge_readl(pcie, MSGF_MISC_STATUS) & + MSGF_MISC_SR_MASKALL; + if (!misc_stat) + return IRQ_NONE; + + if (misc_stat & MSGF_MISC_SR_RXMSG_OVER) + dev_err(pcie->dev, "Received Message FIFO Overflow\n"); + + if (misc_stat & MSGF_MISC_SR_SLAVE_ERR) + dev_err(pcie->dev, "Slave error\n"); + + if (misc_stat & MSGF_MISC_SR_MASTER_ERR) + dev_err(pcie->dev, "Master error\n"); + + if (misc_stat & MSGF_MISC_SR_I_ADDR_ERR) + dev_err(pcie->dev, + "In Misc Ingress address translation error\n"); + + if (misc_stat & MSGF_MISC_SR_E_ADDR_ERR) + dev_err(pcie->dev, + "In Misc Egress address translation error\n"); + + if (misc_stat & MSGF_MISC_SR_PCIE_CORE_ERR) + dev_err(pcie->dev, "PCIe Core error\n"); + + /* Clear misc interrupt status */ + nwl_bridge_writel(pcie, misc_stat, MSGF_MISC_STATUS); + + return IRQ_HANDLED; +} + +static void nwl_pcie_leg_handler(int irq, struct irq_desc *desc) +{ + struct irq_chip *chip = irq_desc_get_chip(desc); + struct nwl_pcie *pcie; + unsigned long status; + u32 bit; + u32 virq; + + chained_irq_enter(chip, desc); + pcie = irq_desc_get_handler_data(desc); + + while ((status = nwl_bridge_readl(pcie, MSGF_LEG_STATUS) & + MSGF_LEG_SR_MASKALL) != 0) { + for_each_set_bit(bit, &status, 4) { + + virq = irq_find_mapping(pcie->legacy_irq_domain, + bit + 1); + if (virq) + generic_handle_irq(virq); + } + } + + chained_irq_exit(chip, desc); + +} + +static void nwl_pcie_msi_handler_high(unsigned int irq, struct irq_desc *desc) +{ + struct irq_chip *chip = irq_desc_get_chip(desc); + struct nwl_pcie *pcie; + struct nwl_msi *msi; + unsigned long status; + u32 bit; + u32 virq; + + chained_irq_enter(chip, desc); + pcie = irq_desc_get_handler_data(desc); + msi = &pcie->msi; + + while ((status = nwl_bridge_readl(pcie, MSGF_MSI_STATUS_HI)) != 0) { + for_each_set_bit(bit, &status, 32) { + nwl_bridge_writel(pcie, 1 << bit, MSGF_MSI_STATUS_HI); + virq = irq_find_mapping(msi->dev_domain, bit); + if (virq) + generic_handle_irq(virq); + } + } + + chained_irq_exit(chip, desc); +} + + +static void nwl_pcie_msi_handler_low(unsigned int irq, struct irq_desc *desc) +{ + struct irq_chip *chip = irq_desc_get_chip(desc); + struct nwl_pcie *pcie; + struct nwl_msi *msi; + unsigned long status; + u32 bit; + u32 virq; + + chained_irq_enter(chip, desc); + pcie = irq_desc_get_handler_data(desc); + msi = &pcie->msi; + + while ((status = nwl_bridge_readl(pcie, MSGF_MSI_STATUS_LO)) != 0) { + for_each_set_bit(bit, &status, 32) { + nwl_bridge_writel(pcie, 1 << bit, MSGF_MSI_STATUS_LO); + virq = irq_find_mapping(msi->dev_domain, bit); + if (virq) + generic_handle_irq(virq); + } + } + + chained_irq_exit(chip, desc); +} + +static int nwl_legacy_map(struct irq_domain *domain, unsigned int irq, + irq_hw_number_t hwirq) +{ + irq_set_chip_and_handler(irq, &dummy_irq_chip, handle_simple_irq); + irq_set_chip_data(irq, domain->host_data); + + return 0; +} + +static const struct irq_domain_ops legacy_domain_ops = { + .map = nwl_legacy_map, +}; + +#ifdef CONFIG_PCI_MSI +static struct irq_chip nwl_msi_irq_chip = { + .name = "nwl_pcie:msi", + .irq_enable = unmask_msi_irq, + .irq_disable = mask_msi_irq, + .irq_mask = mask_msi_irq, + .irq_unmask = unmask_msi_irq, + +}; + +static struct msi_domain_info nwl_msi_domain_info = { + .flags = (MSI_FLAG_USE_DEF_DOM_OPS | MSI_FLAG_USE_DEF_CHIP_OPS), + .chip = &nwl_msi_irq_chip, +}; +#endif + +static void nwl_compose_msi_msg(struct irq_data *data, struct msi_msg *msg) +{ + struct nwl_pcie *pcie = irq_data_get_irq_chip_data(data); + struct nwl_msi *msi = &pcie->msi; + + msg->address_lo = virt_to_phys((void *)msi->pages); + msg->address_hi = 0; + msg->data = data->hwirq; + +} + +static int nwl_msi_set_affinity(struct irq_data *irq_data, + const struct cpumask *mask, bool force) +{ + return -EINVAL; +} + +static struct irq_chip nwl_irq_chip = { + .name = "Xilinx MSI", + .irq_compose_msi_msg = nwl_compose_msi_msg, + .irq_set_affinity = nwl_msi_set_affinity, +}; + +static int nwl_irq_domain_alloc(struct irq_domain *domain, unsigned int virq, + unsigned int nr_irqs, void *args) +{ + struct nwl_pcie *pcie = domain->host_data; + struct nwl_msi *msi = &pcie->msi; + unsigned long bit; + + mutex_lock(&msi->lock); + bit = find_first_zero_bit(msi->used, INT_PCI_MSI_NR); + if (bit < INT_PCI_MSI_NR) + set_bit(bit, msi->used); + else + bit = -ENOSPC; + + mutex_unlock(&msi->lock); + irq_domain_set_info(domain, virq, bit, &nwl_irq_chip, + domain->host_data, handle_simple_irq, + NULL, NULL); + return 0; +} + +static void nwl_irq_domain_free(struct irq_domain *domain, unsigned int virq, + unsigned int nr_irqs) +{ + struct irq_data *data = irq_domain_get_irq_data(domain, virq); + struct nwl_pcie *pcie = irq_data_get_irq_chip_data(data); + struct nwl_msi *msi = &pcie->msi; + + mutex_lock(&msi->lock); + if (!test_bit(data->hwirq, msi->used)) + dev_err(pcie->dev, "freeing unused MSI %lu\n", data->hwirq); + else + clear_bit(data->hwirq, msi->used); + + mutex_unlock(&msi->lock); +} + +static const struct irq_domain_ops dev_msi_domain_ops = { + .alloc = nwl_irq_domain_alloc, + .free = nwl_irq_domain_free, +}; + +static void nwl_pcie_free_irq_domain(struct nwl_pcie *pcie) +{ + int i; + u32 irq; + +#ifdef CONFIG_PCI_MSI + struct nwl_msi *msi = &pcie->msi; +#endif + + for (i = 0; i < 4; i++) { + irq = irq_find_mapping(pcie->legacy_irq_domain, i + 1); + if (irq > 0) + irq_dispose_mapping(irq); + } + + irq_domain_remove(pcie->legacy_irq_domain); + +#ifdef CONFIG_PCI_MSI + irq_set_chained_handler_and_data(msi->irq_msi0, NULL, NULL); + irq_set_chained_handler_and_data(msi->irq_msi1, NULL, NULL); + + irq_domain_remove(msi->msi_chip.domain); + irq_domain_remove(msi->dev_domain); +#endif + +} + +static int nwl_pcie_init_irq_domain(struct nwl_pcie *pcie) +{ + struct device_node *node = pcie->dev->of_node; + struct device_node *legacy_intc_node; + +#ifdef CONFIG_PCI_MSI + struct nwl_msi *msi = &pcie->msi; +#endif + + legacy_intc_node = of_get_next_child(node, NULL); + if (!legacy_intc_node) { + dev_err(pcie->dev, "No legacy intc node found\n"); + return PTR_ERR(legacy_intc_node); + } + + pcie->legacy_irq_domain = irq_domain_add_linear(legacy_intc_node, 4, + &legacy_domain_ops, + pcie); + + if (!pcie->legacy_irq_domain) { + dev_err(pcie->dev, "failed to create IRQ domain\n"); + return -ENOMEM; + } + +#ifdef CONFIG_PCI_MSI + msi->dev_domain = irq_domain_add_linear(NULL, INT_PCI_MSI_NR, + &dev_msi_domain_ops, pcie); + if (!msi->dev_domain) { + dev_err(pcie->dev, "failed to create dev IRQ domain\n"); + return -ENOMEM; + } + msi->msi_chip.domain = pci_msi_create_irq_domain(node, + &nwl_msi_domain_info, + msi->dev_domain); + if (!msi->msi_chip.domain) { + dev_err(pcie->dev, "failed to create msi IRQ domain\n"); + irq_domain_remove(msi->dev_domain); + return -ENOMEM; + } +#endif + return 0; +} + +static int nwl_pcie_enable_msi(struct nwl_pcie *pcie, struct pci_bus *bus) +{ + struct platform_device *pdev = to_platform_device(pcie->dev); + struct nwl_msi *msi = &pcie->msi; + unsigned long base; + int ret; + + mutex_init(&msi->lock); + + msi->msi_chip.dev = pcie->dev; + bus->msi = &msi->msi_chip; + + /* Check for msii_present bit */ + ret = nwl_bridge_readl(pcie, I_MSII_CAPABILITIES) & MSII_PRESENT; + if (!ret) { + dev_err(pcie->dev, "MSI not present\n"); + ret = -EIO; + goto err; + } + + /* Enable MSII */ + nwl_bridge_writel(pcie, nwl_bridge_readl(pcie, I_MSII_CONTROL) | + MSII_ENABLE, I_MSII_CONTROL); + + /* Enable MSII status */ + nwl_bridge_writel(pcie, nwl_bridge_readl(pcie, I_MSII_CONTROL) | + MSII_STATUS_ENABLE, I_MSII_CONTROL); + + /* setup AFI/FPCI range */ + msi->pages = __get_free_pages(GFP_KERNEL, 0); + base = virt_to_phys((void *)msi->pages); + nwl_bridge_writel(pcie, base, I_MSII_BASE_LO); + nwl_bridge_writel(pcie, 0x0, I_MSII_BASE_HI); + + /* Disable high range msi interrupts */ + nwl_bridge_writel(pcie, (u32)~MSGF_MSI_SR_HI_MASK, MSGF_MSI_MASK_HI); + + /* Clear pending high range msi interrupts */ + nwl_bridge_writel(pcie, nwl_bridge_readl(pcie, MSGF_MSI_STATUS_HI) & + MSGF_MSI_SR_HI_MASK, MSGF_MSI_STATUS_HI); + /* Get msi_1 IRQ number */ + msi->irq_msi1 = platform_get_irq_byname(pdev, "msi1"); + if (msi->irq_msi1 < 0) { + dev_err(&pdev->dev, "failed to get IRQ#%d\n", msi->irq_msi1); + goto err; + } + /* Register msi handler */ + irq_set_chained_handler_and_data(msi->irq_msi1, + nwl_pcie_msi_handler_high, pcie); + + /* Enable all high range msi interrupts */ + nwl_bridge_writel(pcie, MSGF_MSI_SR_HI_MASK, MSGF_MSI_MASK_HI); + + /* Disable low range msi interrupts */ + nwl_bridge_writel(pcie, (u32)~MSGF_MSI_SR_LO_MASK, MSGF_MSI_MASK_LO); + + /* Clear pending low range msi interrupts */ + nwl_bridge_writel(pcie, nwl_bridge_readl(pcie, MSGF_MSI_STATUS_LO) & + MSGF_MSI_SR_LO_MASK, MSGF_MSI_STATUS_LO); + /* Get msi_0 IRQ number */ + msi->irq_msi0 = platform_get_irq_byname(pdev, "msi0"); + if (msi->irq_msi0 < 0) { + dev_err(&pdev->dev, "failed to get IRQ#%d\n", msi->irq_msi0); + goto err; + } + + /* Register msi handler */ + irq_set_chained_handler_and_data(msi->irq_msi0, + nwl_pcie_msi_handler_low, pcie); + + /* Enable all low range msi interrupts */ + nwl_bridge_writel(pcie, MSGF_MSI_SR_LO_MASK, MSGF_MSI_MASK_LO); + + return 0; +err: + return ret; +} + +static int nwl_pcie_bridge_init(struct nwl_pcie *pcie) +{ + struct platform_device *pdev = to_platform_device(pcie->dev); + u32 breg_val, ecam_val, first_busno = 0; + int err; + int check_link_up = 0; + + /* Check for BREG present bit */ + breg_val = nwl_bridge_readl(pcie, E_BREG_CAPABILITIES) & BREG_PRESENT; + if (!breg_val) { + dev_err(pcie->dev, "BREG is not present\n"); + return breg_val; + } + /* Write bridge_off to breg base */ + nwl_bridge_writel(pcie, (u32)(pcie->phys_breg_base), + E_BREG_BASE_LO); + + /* Enable BREG */ + nwl_bridge_writel(pcie, ~BREG_ENABLE_FORCE & BREG_ENABLE, + E_BREG_CONTROL); + + /* Disable DMA channel registers */ + nwl_bridge_writel(pcie, nwl_bridge_readl(pcie, BRCFG_PCIE_RX0) | + CFG_DMA_REG_BAR, BRCFG_PCIE_RX0); + + /* Enable the bridge config interrupt */ + nwl_bridge_writel(pcie, nwl_bridge_readl(pcie, BRCFG_INTERRUPT) | + BRCFG_INTERRUPT_MASK, BRCFG_INTERRUPT); + /* Enable Ingress subtractive decode translation */ + nwl_bridge_writel(pcie, SET_ISUB_CONTROL, I_ISUB_CONTROL); + + /* Enable msg filtering details */ + nwl_bridge_writel(pcie, CFG_ENABLE_MSG_FILTER_MASK, + BRCFG_PCIE_RX_MSG_FILTER); + do { + err = nwl_pcie_link_up(pcie, PHY_RDY_LINKUP); + if (err != 1) { + check_link_up++; + if (check_link_up > LINKUP_ITER_CHECK) + return -ENODEV; + mdelay(1000); + } + } while (!err); + + /* Check for ECAM present bit */ + ecam_val = nwl_bridge_readl(pcie, E_ECAM_CAPABILITIES) & E_ECAM_PRESENT; + if (!ecam_val) { + dev_err(pcie->dev, "ECAM is not present\n"); + return ecam_val; + } + + /* Enable ECAM */ + nwl_bridge_writel(pcie, nwl_bridge_readl(pcie, E_ECAM_CONTROL) | + E_ECAM_CR_ENABLE, E_ECAM_CONTROL); + /* Write ecam_value on ecam_control */ + nwl_bridge_writel(pcie, nwl_bridge_readl(pcie, E_ECAM_CONTROL) | + (pcie->ecam_value << E_ECAM_SIZE_SHIFT), + E_ECAM_CONTROL); + /* Write phy_reg_base to ecam base */ + nwl_bridge_writel(pcie, (u32)pcie->phys_ecam_base, E_ECAM_BASE_LO); + + /* Get bus range */ + ecam_val = nwl_bridge_readl(pcie, E_ECAM_CONTROL); + pcie->last_busno = (ecam_val & E_ECAM_SIZE_LOC) >> E_ECAM_SIZE_SHIFT; + /* Write primary, secondary and subordinate bus numbers */ + ecam_val = first_busno; + ecam_val |= (first_busno + 1) << 8; + ecam_val |= (pcie->last_busno << E_ECAM_SIZE_SHIFT); + writel(ecam_val, (pcie->ecam_base + PCI_PRIMARY_BUS)); + + /* Check if PCIe link is up? */ + pcie->link_up = nwl_pcie_link_up(pcie, PCIE_USER_LINKUP); + if (!pcie->link_up) + dev_info(pcie->dev, "Link is DOWN\n"); + else + dev_info(pcie->dev, "Link is UP\n"); + + /* Disable all misc interrupts */ + nwl_bridge_writel(pcie, (u32)~MSGF_MISC_SR_MASKALL, MSGF_MISC_MASK); + + /* Clear pending misc interrupts */ + nwl_bridge_writel(pcie, nwl_bridge_readl(pcie, MSGF_MISC_STATUS) & + MSGF_MISC_SR_MASKALL, MSGF_MISC_STATUS); + + /* Get misc IRQ number */ + pcie->irq_misc = platform_get_irq_byname(pdev, "misc"); + if (pcie->irq_misc < 0) { + dev_err(&pdev->dev, "failed to get misc IRQ#%d\n", + pcie->irq_misc); + return pcie->irq_misc; + } + /* Register misc handler */ + err = devm_request_irq(pcie->dev, pcie->irq_misc, + nwl_pcie_misc_handler, IRQF_SHARED, + "nwl_pcie:misc", pcie); + if (err) { + dev_err(pcie->dev, "fail to register misc IRQ#%d\n", + pcie->irq_misc); + return err; + } + /* Enable all misc interrupts */ + nwl_bridge_writel(pcie, MSGF_MISC_SR_MASKALL, MSGF_MISC_MASK); + + /* Disable all legacy interrupts */ + nwl_bridge_writel(pcie, (u32)~MSGF_LEG_SR_MASKALL, MSGF_LEG_MASK); + + /* Clear pending legacy interrupts */ + nwl_bridge_writel(pcie, nwl_bridge_readl(pcie, MSGF_LEG_STATUS) & + MSGF_LEG_SR_MASKALL, MSGF_LEG_STATUS); + /* Get intx IRQ number */ + pcie->irq_intx = platform_get_irq_byname(pdev, "intx"); + if (pcie->irq_intx < 0) { + dev_err(&pdev->dev, "failed to get intx IRQ#%d\n", + pcie->irq_intx); + return pcie->irq_intx; + } + + /* Enable all legacy interrupts */ + nwl_bridge_writel(pcie, MSGF_LEG_SR_MASKALL, MSGF_LEG_MASK); + + return 0; +} + +static int nwl_pcie_parse_dt(struct nwl_pcie *pcie, + struct platform_device *pdev) +{ + struct device_node *node = pcie->dev->of_node; + struct resource *res; + const char *type; + + /* Check for device type */ + type = of_get_property(node, "device_type", NULL); + if (!type || strcmp(type, "pci")) { + dev_err(pcie->dev, "invalid \"device_type\" %s\n", type); + return -EINVAL; + } + + res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "breg"); + pcie->breg_base = devm_ioremap_resource(pcie->dev, res); + if (IS_ERR(pcie->breg_base)) + return PTR_ERR(pcie->breg_base); + pcie->phys_breg_base = res->start; + + res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "pcireg"); + pcie->pcireg_base = devm_ioremap_resource(pcie->dev, res); + if (IS_ERR(pcie->pcireg_base)) + return PTR_ERR(pcie->pcireg_base); + pcie->phys_pcie_reg_base = res->start; + + res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "cfg"); + pcie->ecam_base = devm_ioremap_resource(pcie->dev, res); + if (IS_ERR(pcie->ecam_base)) + return PTR_ERR(pcie->ecam_base); + pcie->phys_ecam_base = res->start; + + /* Get intx IRQ number */ + pcie->irq_intx = platform_get_irq_byname(pdev, "intx"); + if (pcie->irq_intx < 0) { + dev_err(&pdev->dev, "failed to get intx IRQ#%d\n", + pcie->irq_intx); + return pcie->irq_intx; + } + + /* Register intx handler */ + irq_set_chained_handler_and_data(pcie->irq_intx, + nwl_pcie_leg_handler, pcie); + + return 0; +} + +static const struct of_device_id nwl_pcie_of_match[] = { + { .compatible = "xlnx,nwl-pcie-2.11", }, + {} +}; + +static int nwl_pcie_probe(struct platform_device *pdev) +{ + struct device_node *node = pdev->dev.of_node; + struct nwl_pcie *pcie; + struct pci_bus *bus; + int err; + + resource_size_t iobase = 0; + LIST_HEAD(res); + + pcie = devm_kzalloc(&pdev->dev, sizeof(*pcie), GFP_KERNEL); + if (!pcie) + return -ENOMEM; + + pcie->ecam_value = NWL_ECAM_VALUE_DEFAULT; + + pcie->dev = &pdev->dev; + + err = nwl_pcie_parse_dt(pcie, pdev); + if (err) { + dev_err(pcie->dev, "Parsing DT failed\n"); + return err; + } + /* Bridge initialization */ + err = nwl_pcie_bridge_init(pcie); + if (err) { + dev_err(pcie->dev, "HW Initalization failed\n"); + return err; + } + + err = of_pci_get_host_bridge_resources(node, 0, 0xff, &res, &iobase); + if (err) { + pr_err("Getting bridge resources failed\n"); + return err; + } + + err = nwl_pcie_init_irq_domain(pcie); + if (err) { + dev_err(pcie->dev, "Failed creating IRQ Domain\n"); + return err; + } + + bus = pci_create_root_bus(&pdev->dev, 0, + &nwl_pcie_ops, pcie, &res); + if (!bus) + return -ENOMEM; + + /* Enable MSI */ + if (IS_ENABLED(CONFIG_PCI_MSI)) { + err = nwl_pcie_enable_msi(pcie, bus); + if (err < 0) { + dev_err(&pdev->dev, + "failed to enable MSI support: %d\n", err); + return err; + } + } + pci_scan_child_bus(bus); + pci_assign_unassigned_bus_resources(bus); + pci_bus_add_devices(bus); + platform_set_drvdata(pdev, pcie); + + return 0; +} + +static int nwl_pcie_remove(struct platform_device *pdev) +{ + struct nwl_pcie *pcie = platform_get_drvdata(pdev); + + nwl_pcie_free_irq_domain(pcie); + platform_set_drvdata(pdev, NULL); + + return 0; +} + +static struct platform_driver nwl_pcie_driver = { + .driver = { + .name = "nwl-pcie", + .of_match_table = nwl_pcie_of_match, + }, + .probe = nwl_pcie_probe, + .remove = nwl_pcie_remove, +}; +module_platform_driver(nwl_pcie_driver); + +MODULE_AUTHOR("Xilinx, Inc"); +MODULE_DESCRIPTION("NWL PCIe driver"); +MODULE_LICENSE("GPL");