| Message ID | 20210120150800.1650898-1-arnd@kernel.org (mailing list archive) |
|---|---|
| State | Accepted |
| Delegated to: | Lorenzo Pieralisi |
| Headers | show |
| Series | pci: remove tango host controller driver | expand |
Arnd Bergmann <arnd@kernel.org> writes: > From: Arnd Bergmann <arnd@arndb.de> > > The tango platform is getting removed, so the driver is no > longer needed. > > Cc: Marc Gonzalez <marc.w.gonzalez@free.fr> > Cc: Mans Rullgard <mans@mansr.com> > Signed-off-by: Arnd Bergmann <arnd@arndb.de> Acked-by: Mans Rullgard <mans@mansr.com> > --- > drivers/pci/controller/Kconfig | 14 -- > drivers/pci/controller/Makefile | 1 - > drivers/pci/controller/pcie-tango.c | 341 ---------------------------- > 3 files changed, 356 deletions(-) > delete mode 100644 drivers/pci/controller/pcie-tango.c > > diff --git a/drivers/pci/controller/Kconfig b/drivers/pci/controller/Kconfig > index 64e2f5e379aa..8c85c16594f2 100644 > --- a/drivers/pci/controller/Kconfig > +++ b/drivers/pci/controller/Kconfig > @@ -242,20 +242,6 @@ config PCIE_MEDIATEK > Say Y here if you want to enable PCIe controller support on > MediaTek SoCs. > > -config PCIE_TANGO_SMP8759 > - bool "Tango SMP8759 PCIe controller (DANGEROUS)" > - depends on ARCH_TANGO && PCI_MSI && OF > - depends on BROKEN > - select PCI_HOST_COMMON > - help > - Say Y here to enable PCIe controller support for Sigma Designs > - Tango SMP8759-based systems. > - > - Note: The SMP8759 controller multiplexes PCI config and MMIO > - accesses, and Linux doesn't provide a way to serialize them. > - This can lead to data corruption if drivers perform concurrent > - config and MMIO accesses. > - > config VMD > depends on PCI_MSI && X86_64 && SRCU > tristate "Intel Volume Management Device Driver" > diff --git a/drivers/pci/controller/Makefile b/drivers/pci/controller/Makefile > index 04c6edc285c5..b3a7912f8a5c 100644 > --- a/drivers/pci/controller/Makefile > +++ b/drivers/pci/controller/Makefile > @@ -27,7 +27,6 @@ obj-$(CONFIG_PCIE_ROCKCHIP) += pcie-rockchip.o > obj-$(CONFIG_PCIE_ROCKCHIP_EP) += pcie-rockchip-ep.o > obj-$(CONFIG_PCIE_ROCKCHIP_HOST) += pcie-rockchip-host.o > obj-$(CONFIG_PCIE_MEDIATEK) += pcie-mediatek.o > -obj-$(CONFIG_PCIE_TANGO_SMP8759) += pcie-tango.o > obj-$(CONFIG_VMD) += vmd.o > obj-$(CONFIG_PCIE_BRCMSTB) += pcie-brcmstb.o > obj-$(CONFIG_PCI_LOONGSON) += pci-loongson.o > diff --git a/drivers/pci/controller/pcie-tango.c b/drivers/pci/controller/pcie-tango.c > deleted file mode 100644 > index 62a061f1d62e..000000000000 > --- a/drivers/pci/controller/pcie-tango.c > +++ /dev/null > @@ -1,341 +0,0 @@ > -// SPDX-License-Identifier: GPL-2.0 > -#include <linux/irqchip/chained_irq.h> > -#include <linux/irqdomain.h> > -#include <linux/pci-ecam.h> > -#include <linux/delay.h> > -#include <linux/msi.h> > -#include <linux/of_address.h> > - > -#define MSI_MAX 256 > - > -#define SMP8759_MUX 0x48 > -#define SMP8759_TEST_OUT 0x74 > -#define SMP8759_DOORBELL 0x7c > -#define SMP8759_STATUS 0x80 > -#define SMP8759_ENABLE 0xa0 > - > -struct tango_pcie { > - DECLARE_BITMAP(used_msi, MSI_MAX); > - u64 msi_doorbell; > - spinlock_t used_msi_lock; > - void __iomem *base; > - struct irq_domain *dom; > -}; > - > -static void tango_msi_isr(struct irq_desc *desc) > -{ > - struct irq_chip *chip = irq_desc_get_chip(desc); > - struct tango_pcie *pcie = irq_desc_get_handler_data(desc); > - unsigned long status, base, virq, idx, pos = 0; > - > - chained_irq_enter(chip, desc); > - spin_lock(&pcie->used_msi_lock); > - > - while ((pos = find_next_bit(pcie->used_msi, MSI_MAX, pos)) < MSI_MAX) { > - base = round_down(pos, 32); > - status = readl_relaxed(pcie->base + SMP8759_STATUS + base / 8); > - for_each_set_bit(idx, &status, 32) { > - virq = irq_find_mapping(pcie->dom, base + idx); > - generic_handle_irq(virq); > - } > - pos = base + 32; > - } > - > - spin_unlock(&pcie->used_msi_lock); > - chained_irq_exit(chip, desc); > -} > - > -static void tango_ack(struct irq_data *d) > -{ > - struct tango_pcie *pcie = d->chip_data; > - u32 offset = (d->hwirq / 32) * 4; > - u32 bit = BIT(d->hwirq % 32); > - > - writel_relaxed(bit, pcie->base + SMP8759_STATUS + offset); > -} > - > -static void update_msi_enable(struct irq_data *d, bool unmask) > -{ > - unsigned long flags; > - struct tango_pcie *pcie = d->chip_data; > - u32 offset = (d->hwirq / 32) * 4; > - u32 bit = BIT(d->hwirq % 32); > - u32 val; > - > - spin_lock_irqsave(&pcie->used_msi_lock, flags); > - val = readl_relaxed(pcie->base + SMP8759_ENABLE + offset); > - val = unmask ? val | bit : val & ~bit; > - writel_relaxed(val, pcie->base + SMP8759_ENABLE + offset); > - spin_unlock_irqrestore(&pcie->used_msi_lock, flags); > -} > - > -static void tango_mask(struct irq_data *d) > -{ > - update_msi_enable(d, false); > -} > - > -static void tango_unmask(struct irq_data *d) > -{ > - update_msi_enable(d, true); > -} > - > -static int tango_set_affinity(struct irq_data *d, const struct cpumask *mask, > - bool force) > -{ > - return -EINVAL; > -} > - > -static void tango_compose_msi_msg(struct irq_data *d, struct msi_msg *msg) > -{ > - struct tango_pcie *pcie = d->chip_data; > - msg->address_lo = lower_32_bits(pcie->msi_doorbell); > - msg->address_hi = upper_32_bits(pcie->msi_doorbell); > - msg->data = d->hwirq; > -} > - > -static struct irq_chip tango_chip = { > - .irq_ack = tango_ack, > - .irq_mask = tango_mask, > - .irq_unmask = tango_unmask, > - .irq_set_affinity = tango_set_affinity, > - .irq_compose_msi_msg = tango_compose_msi_msg, > -}; > - > -static void msi_ack(struct irq_data *d) > -{ > - irq_chip_ack_parent(d); > -} > - > -static void msi_mask(struct irq_data *d) > -{ > - pci_msi_mask_irq(d); > - irq_chip_mask_parent(d); > -} > - > -static void msi_unmask(struct irq_data *d) > -{ > - pci_msi_unmask_irq(d); > - irq_chip_unmask_parent(d); > -} > - > -static struct irq_chip msi_chip = { > - .name = "MSI", > - .irq_ack = msi_ack, > - .irq_mask = msi_mask, > - .irq_unmask = msi_unmask, > -}; > - > -static struct msi_domain_info msi_dom_info = { > - .flags = MSI_FLAG_PCI_MSIX > - | MSI_FLAG_USE_DEF_DOM_OPS > - | MSI_FLAG_USE_DEF_CHIP_OPS, > - .chip = &msi_chip, > -}; > - > -static int tango_irq_domain_alloc(struct irq_domain *dom, unsigned int virq, > - unsigned int nr_irqs, void *args) > -{ > - struct tango_pcie *pcie = dom->host_data; > - unsigned long flags; > - int pos; > - > - spin_lock_irqsave(&pcie->used_msi_lock, flags); > - pos = find_first_zero_bit(pcie->used_msi, MSI_MAX); > - if (pos >= MSI_MAX) { > - spin_unlock_irqrestore(&pcie->used_msi_lock, flags); > - return -ENOSPC; > - } > - __set_bit(pos, pcie->used_msi); > - spin_unlock_irqrestore(&pcie->used_msi_lock, flags); > - irq_domain_set_info(dom, virq, pos, &tango_chip, > - pcie, handle_edge_irq, NULL, NULL); > - > - return 0; > -} > - > -static void tango_irq_domain_free(struct irq_domain *dom, unsigned int virq, > - unsigned int nr_irqs) > -{ > - unsigned long flags; > - struct irq_data *d = irq_domain_get_irq_data(dom, virq); > - struct tango_pcie *pcie = d->chip_data; > - > - spin_lock_irqsave(&pcie->used_msi_lock, flags); > - __clear_bit(d->hwirq, pcie->used_msi); > - spin_unlock_irqrestore(&pcie->used_msi_lock, flags); > -} > - > -static const struct irq_domain_ops dom_ops = { > - .alloc = tango_irq_domain_alloc, > - .free = tango_irq_domain_free, > -}; > - > -static int smp8759_config_read(struct pci_bus *bus, unsigned int devfn, > - int where, int size, u32 *val) > -{ > - struct pci_config_window *cfg = bus->sysdata; > - struct tango_pcie *pcie = dev_get_drvdata(cfg->parent); > - int ret; > - > - /* Reads in configuration space outside devfn 0 return garbage */ > - if (devfn != 0) > - return PCIBIOS_FUNC_NOT_SUPPORTED; > - > - /* > - * PCI config and MMIO accesses are muxed. Linux doesn't have a > - * mutual exclusion mechanism for config vs. MMIO accesses, so > - * concurrent accesses may cause corruption. > - */ > - writel_relaxed(1, pcie->base + SMP8759_MUX); > - ret = pci_generic_config_read(bus, devfn, where, size, val); > - writel_relaxed(0, pcie->base + SMP8759_MUX); > - > - return ret; > -} > - > -static int smp8759_config_write(struct pci_bus *bus, unsigned int devfn, > - int where, int size, u32 val) > -{ > - struct pci_config_window *cfg = bus->sysdata; > - struct tango_pcie *pcie = dev_get_drvdata(cfg->parent); > - int ret; > - > - writel_relaxed(1, pcie->base + SMP8759_MUX); > - ret = pci_generic_config_write(bus, devfn, where, size, val); > - writel_relaxed(0, pcie->base + SMP8759_MUX); > - > - return ret; > -} > - > -static const struct pci_ecam_ops smp8759_ecam_ops = { > - .pci_ops = { > - .map_bus = pci_ecam_map_bus, > - .read = smp8759_config_read, > - .write = smp8759_config_write, > - } > -}; > - > -static int tango_pcie_link_up(struct tango_pcie *pcie) > -{ > - void __iomem *test_out = pcie->base + SMP8759_TEST_OUT; > - int i; > - > - writel_relaxed(16, test_out); > - for (i = 0; i < 10; ++i) { > - u32 ltssm_state = readl_relaxed(test_out) >> 8; > - if ((ltssm_state & 0x1f) == 0xf) /* L0 */ > - return 1; > - usleep_range(3000, 4000); > - } > - > - return 0; > -} > - > -static int tango_pcie_probe(struct platform_device *pdev) > -{ > - struct device *dev = &pdev->dev; > - struct tango_pcie *pcie; > - struct resource *res; > - struct fwnode_handle *fwnode = of_node_to_fwnode(dev->of_node); > - struct irq_domain *msi_dom, *irq_dom; > - struct of_pci_range_parser parser; > - struct of_pci_range range; > - int virq, offset; > - > - dev_warn(dev, "simultaneous PCI config and MMIO accesses may cause data corruption\n"); > - add_taint(TAINT_CRAP, LOCKDEP_STILL_OK); > - > - pcie = devm_kzalloc(dev, sizeof(*pcie), GFP_KERNEL); > - if (!pcie) > - return -ENOMEM; > - > - res = platform_get_resource(pdev, IORESOURCE_MEM, 1); > - pcie->base = devm_ioremap_resource(dev, res); > - if (IS_ERR(pcie->base)) > - return PTR_ERR(pcie->base); > - > - platform_set_drvdata(pdev, pcie); > - > - if (!tango_pcie_link_up(pcie)) > - return -ENODEV; > - > - if (of_pci_dma_range_parser_init(&parser, dev->of_node) < 0) > - return -ENOENT; > - > - if (of_pci_range_parser_one(&parser, &range) == NULL) > - return -ENOENT; > - > - range.pci_addr += range.size; > - pcie->msi_doorbell = range.pci_addr + res->start + SMP8759_DOORBELL; > - > - for (offset = 0; offset < MSI_MAX / 8; offset += 4) > - writel_relaxed(0, pcie->base + SMP8759_ENABLE + offset); > - > - virq = platform_get_irq(pdev, 1); > - if (virq < 0) > - return virq; > - > - irq_dom = irq_domain_create_linear(fwnode, MSI_MAX, &dom_ops, pcie); > - if (!irq_dom) { > - dev_err(dev, "Failed to create IRQ domain\n"); > - return -ENOMEM; > - } > - > - msi_dom = pci_msi_create_irq_domain(fwnode, &msi_dom_info, irq_dom); > - if (!msi_dom) { > - dev_err(dev, "Failed to create MSI domain\n"); > - irq_domain_remove(irq_dom); > - return -ENOMEM; > - } > - > - pcie->dom = irq_dom; > - spin_lock_init(&pcie->used_msi_lock); > - irq_set_chained_handler_and_data(virq, tango_msi_isr, pcie); > - > - return pci_host_common_probe(pdev); > -} > - > -static const struct of_device_id tango_pcie_ids[] = { > - { > - .compatible = "sigma,smp8759-pcie", > - .data = &smp8759_ecam_ops, > - }, > - { }, > -}; > - > -static struct platform_driver tango_pcie_driver = { > - .probe = tango_pcie_probe, > - .driver = { > - .name = KBUILD_MODNAME, > - .of_match_table = tango_pcie_ids, > - .suppress_bind_attrs = true, > - }, > -}; > -builtin_platform_driver(tango_pcie_driver); > - > -/* > - * The root complex advertises the wrong device class. > - * Header Type 1 is for PCI-to-PCI bridges. > - */ > -static void tango_fixup_class(struct pci_dev *dev) > -{ > - dev->class = PCI_CLASS_BRIDGE_PCI << 8; > -} > -DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_SIGMA, 0x0024, tango_fixup_class); > -DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_SIGMA, 0x0028, tango_fixup_class); > - > -/* > - * The root complex exposes a "fake" BAR, which is used to filter > - * bus-to-system accesses. Only accesses within the range defined by this > - * BAR are forwarded to the host, others are ignored. > - * > - * By default, the DMA framework expects an identity mapping, and DRAM0 is > - * mapped at 0x80000000. > - */ > -static void tango_fixup_bar(struct pci_dev *dev) > -{ > - dev->non_compliant_bars = true; > - pci_write_config_dword(dev, PCI_BASE_ADDRESS_0, 0x80000000); > -} > -DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_SIGMA, 0x0024, tango_fixup_bar); > -DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_SIGMA, 0x0028, tango_fixup_bar); > -- > > 2.29.2 >
On Wed, 20 Jan 2021 16:07:29 +0100, Arnd Bergmann wrote: > The tango platform is getting removed, so the driver is no > longer needed. Applied to pci/tango, thanks! [1/1] PCI: Remove tango host controller driver https://git.kernel.org/lpieralisi/pci/c/de9427ca87 Thanks, Lorenzo
diff --git a/drivers/pci/controller/Kconfig b/drivers/pci/controller/Kconfig index 64e2f5e379aa..8c85c16594f2 100644 --- a/drivers/pci/controller/Kconfig +++ b/drivers/pci/controller/Kconfig @@ -242,20 +242,6 @@ config PCIE_MEDIATEK Say Y here if you want to enable PCIe controller support on MediaTek SoCs. -config PCIE_TANGO_SMP8759 - bool "Tango SMP8759 PCIe controller (DANGEROUS)" - depends on ARCH_TANGO && PCI_MSI && OF - depends on BROKEN - select PCI_HOST_COMMON - help - Say Y here to enable PCIe controller support for Sigma Designs - Tango SMP8759-based systems. - - Note: The SMP8759 controller multiplexes PCI config and MMIO - accesses, and Linux doesn't provide a way to serialize them. - This can lead to data corruption if drivers perform concurrent - config and MMIO accesses. - config VMD depends on PCI_MSI && X86_64 && SRCU tristate "Intel Volume Management Device Driver" diff --git a/drivers/pci/controller/Makefile b/drivers/pci/controller/Makefile index 04c6edc285c5..b3a7912f8a5c 100644 --- a/drivers/pci/controller/Makefile +++ b/drivers/pci/controller/Makefile @@ -27,7 +27,6 @@ obj-$(CONFIG_PCIE_ROCKCHIP) += pcie-rockchip.o obj-$(CONFIG_PCIE_ROCKCHIP_EP) += pcie-rockchip-ep.o obj-$(CONFIG_PCIE_ROCKCHIP_HOST) += pcie-rockchip-host.o obj-$(CONFIG_PCIE_MEDIATEK) += pcie-mediatek.o -obj-$(CONFIG_PCIE_TANGO_SMP8759) += pcie-tango.o obj-$(CONFIG_VMD) += vmd.o obj-$(CONFIG_PCIE_BRCMSTB) += pcie-brcmstb.o obj-$(CONFIG_PCI_LOONGSON) += pci-loongson.o diff --git a/drivers/pci/controller/pcie-tango.c b/drivers/pci/controller/pcie-tango.c deleted file mode 100644 index 62a061f1d62e..000000000000 --- a/drivers/pci/controller/pcie-tango.c +++ /dev/null @@ -1,341 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0 -#include <linux/irqchip/chained_irq.h> -#include <linux/irqdomain.h> -#include <linux/pci-ecam.h> -#include <linux/delay.h> -#include <linux/msi.h> -#include <linux/of_address.h> - -#define MSI_MAX 256 - -#define SMP8759_MUX 0x48 -#define SMP8759_TEST_OUT 0x74 -#define SMP8759_DOORBELL 0x7c -#define SMP8759_STATUS 0x80 -#define SMP8759_ENABLE 0xa0 - -struct tango_pcie { - DECLARE_BITMAP(used_msi, MSI_MAX); - u64 msi_doorbell; - spinlock_t used_msi_lock; - void __iomem *base; - struct irq_domain *dom; -}; - -static void tango_msi_isr(struct irq_desc *desc) -{ - struct irq_chip *chip = irq_desc_get_chip(desc); - struct tango_pcie *pcie = irq_desc_get_handler_data(desc); - unsigned long status, base, virq, idx, pos = 0; - - chained_irq_enter(chip, desc); - spin_lock(&pcie->used_msi_lock); - - while ((pos = find_next_bit(pcie->used_msi, MSI_MAX, pos)) < MSI_MAX) { - base = round_down(pos, 32); - status = readl_relaxed(pcie->base + SMP8759_STATUS + base / 8); - for_each_set_bit(idx, &status, 32) { - virq = irq_find_mapping(pcie->dom, base + idx); - generic_handle_irq(virq); - } - pos = base + 32; - } - - spin_unlock(&pcie->used_msi_lock); - chained_irq_exit(chip, desc); -} - -static void tango_ack(struct irq_data *d) -{ - struct tango_pcie *pcie = d->chip_data; - u32 offset = (d->hwirq / 32) * 4; - u32 bit = BIT(d->hwirq % 32); - - writel_relaxed(bit, pcie->base + SMP8759_STATUS + offset); -} - -static void update_msi_enable(struct irq_data *d, bool unmask) -{ - unsigned long flags; - struct tango_pcie *pcie = d->chip_data; - u32 offset = (d->hwirq / 32) * 4; - u32 bit = BIT(d->hwirq % 32); - u32 val; - - spin_lock_irqsave(&pcie->used_msi_lock, flags); - val = readl_relaxed(pcie->base + SMP8759_ENABLE + offset); - val = unmask ? val | bit : val & ~bit; - writel_relaxed(val, pcie->base + SMP8759_ENABLE + offset); - spin_unlock_irqrestore(&pcie->used_msi_lock, flags); -} - -static void tango_mask(struct irq_data *d) -{ - update_msi_enable(d, false); -} - -static void tango_unmask(struct irq_data *d) -{ - update_msi_enable(d, true); -} - -static int tango_set_affinity(struct irq_data *d, const struct cpumask *mask, - bool force) -{ - return -EINVAL; -} - -static void tango_compose_msi_msg(struct irq_data *d, struct msi_msg *msg) -{ - struct tango_pcie *pcie = d->chip_data; - msg->address_lo = lower_32_bits(pcie->msi_doorbell); - msg->address_hi = upper_32_bits(pcie->msi_doorbell); - msg->data = d->hwirq; -} - -static struct irq_chip tango_chip = { - .irq_ack = tango_ack, - .irq_mask = tango_mask, - .irq_unmask = tango_unmask, - .irq_set_affinity = tango_set_affinity, - .irq_compose_msi_msg = tango_compose_msi_msg, -}; - -static void msi_ack(struct irq_data *d) -{ - irq_chip_ack_parent(d); -} - -static void msi_mask(struct irq_data *d) -{ - pci_msi_mask_irq(d); - irq_chip_mask_parent(d); -} - -static void msi_unmask(struct irq_data *d) -{ - pci_msi_unmask_irq(d); - irq_chip_unmask_parent(d); -} - -static struct irq_chip msi_chip = { - .name = "MSI", - .irq_ack = msi_ack, - .irq_mask = msi_mask, - .irq_unmask = msi_unmask, -}; - -static struct msi_domain_info msi_dom_info = { - .flags = MSI_FLAG_PCI_MSIX - | MSI_FLAG_USE_DEF_DOM_OPS - | MSI_FLAG_USE_DEF_CHIP_OPS, - .chip = &msi_chip, -}; - -static int tango_irq_domain_alloc(struct irq_domain *dom, unsigned int virq, - unsigned int nr_irqs, void *args) -{ - struct tango_pcie *pcie = dom->host_data; - unsigned long flags; - int pos; - - spin_lock_irqsave(&pcie->used_msi_lock, flags); - pos = find_first_zero_bit(pcie->used_msi, MSI_MAX); - if (pos >= MSI_MAX) { - spin_unlock_irqrestore(&pcie->used_msi_lock, flags); - return -ENOSPC; - } - __set_bit(pos, pcie->used_msi); - spin_unlock_irqrestore(&pcie->used_msi_lock, flags); - irq_domain_set_info(dom, virq, pos, &tango_chip, - pcie, handle_edge_irq, NULL, NULL); - - return 0; -} - -static void tango_irq_domain_free(struct irq_domain *dom, unsigned int virq, - unsigned int nr_irqs) -{ - unsigned long flags; - struct irq_data *d = irq_domain_get_irq_data(dom, virq); - struct tango_pcie *pcie = d->chip_data; - - spin_lock_irqsave(&pcie->used_msi_lock, flags); - __clear_bit(d->hwirq, pcie->used_msi); - spin_unlock_irqrestore(&pcie->used_msi_lock, flags); -} - -static const struct irq_domain_ops dom_ops = { - .alloc = tango_irq_domain_alloc, - .free = tango_irq_domain_free, -}; - -static int smp8759_config_read(struct pci_bus *bus, unsigned int devfn, - int where, int size, u32 *val) -{ - struct pci_config_window *cfg = bus->sysdata; - struct tango_pcie *pcie = dev_get_drvdata(cfg->parent); - int ret; - - /* Reads in configuration space outside devfn 0 return garbage */ - if (devfn != 0) - return PCIBIOS_FUNC_NOT_SUPPORTED; - - /* - * PCI config and MMIO accesses are muxed. Linux doesn't have a - * mutual exclusion mechanism for config vs. MMIO accesses, so - * concurrent accesses may cause corruption. - */ - writel_relaxed(1, pcie->base + SMP8759_MUX); - ret = pci_generic_config_read(bus, devfn, where, size, val); - writel_relaxed(0, pcie->base + SMP8759_MUX); - - return ret; -} - -static int smp8759_config_write(struct pci_bus *bus, unsigned int devfn, - int where, int size, u32 val) -{ - struct pci_config_window *cfg = bus->sysdata; - struct tango_pcie *pcie = dev_get_drvdata(cfg->parent); - int ret; - - writel_relaxed(1, pcie->base + SMP8759_MUX); - ret = pci_generic_config_write(bus, devfn, where, size, val); - writel_relaxed(0, pcie->base + SMP8759_MUX); - - return ret; -} - -static const struct pci_ecam_ops smp8759_ecam_ops = { - .pci_ops = { - .map_bus = pci_ecam_map_bus, - .read = smp8759_config_read, - .write = smp8759_config_write, - } -}; - -static int tango_pcie_link_up(struct tango_pcie *pcie) -{ - void __iomem *test_out = pcie->base + SMP8759_TEST_OUT; - int i; - - writel_relaxed(16, test_out); - for (i = 0; i < 10; ++i) { - u32 ltssm_state = readl_relaxed(test_out) >> 8; - if ((ltssm_state & 0x1f) == 0xf) /* L0 */ - return 1; - usleep_range(3000, 4000); - } - - return 0; -} - -static int tango_pcie_probe(struct platform_device *pdev) -{ - struct device *dev = &pdev->dev; - struct tango_pcie *pcie; - struct resource *res; - struct fwnode_handle *fwnode = of_node_to_fwnode(dev->of_node); - struct irq_domain *msi_dom, *irq_dom; - struct of_pci_range_parser parser; - struct of_pci_range range; - int virq, offset; - - dev_warn(dev, "simultaneous PCI config and MMIO accesses may cause data corruption\n"); - add_taint(TAINT_CRAP, LOCKDEP_STILL_OK); - - pcie = devm_kzalloc(dev, sizeof(*pcie), GFP_KERNEL); - if (!pcie) - return -ENOMEM; - - res = platform_get_resource(pdev, IORESOURCE_MEM, 1); - pcie->base = devm_ioremap_resource(dev, res); - if (IS_ERR(pcie->base)) - return PTR_ERR(pcie->base); - - platform_set_drvdata(pdev, pcie); - - if (!tango_pcie_link_up(pcie)) - return -ENODEV; - - if (of_pci_dma_range_parser_init(&parser, dev->of_node) < 0) - return -ENOENT; - - if (of_pci_range_parser_one(&parser, &range) == NULL) - return -ENOENT; - - range.pci_addr += range.size; - pcie->msi_doorbell = range.pci_addr + res->start + SMP8759_DOORBELL; - - for (offset = 0; offset < MSI_MAX / 8; offset += 4) - writel_relaxed(0, pcie->base + SMP8759_ENABLE + offset); - - virq = platform_get_irq(pdev, 1); - if (virq < 0) - return virq; - - irq_dom = irq_domain_create_linear(fwnode, MSI_MAX, &dom_ops, pcie); - if (!irq_dom) { - dev_err(dev, "Failed to create IRQ domain\n"); - return -ENOMEM; - } - - msi_dom = pci_msi_create_irq_domain(fwnode, &msi_dom_info, irq_dom); - if (!msi_dom) { - dev_err(dev, "Failed to create MSI domain\n"); - irq_domain_remove(irq_dom); - return -ENOMEM; - } - - pcie->dom = irq_dom; - spin_lock_init(&pcie->used_msi_lock); - irq_set_chained_handler_and_data(virq, tango_msi_isr, pcie); - - return pci_host_common_probe(pdev); -} - -static const struct of_device_id tango_pcie_ids[] = { - { - .compatible = "sigma,smp8759-pcie", - .data = &smp8759_ecam_ops, - }, - { }, -}; - -static struct platform_driver tango_pcie_driver = { - .probe = tango_pcie_probe, - .driver = { - .name = KBUILD_MODNAME, - .of_match_table = tango_pcie_ids, - .suppress_bind_attrs = true, - }, -}; -builtin_platform_driver(tango_pcie_driver); - -/* - * The root complex advertises the wrong device class. - * Header Type 1 is for PCI-to-PCI bridges. - */ -static void tango_fixup_class(struct pci_dev *dev) -{ - dev->class = PCI_CLASS_BRIDGE_PCI << 8; -} -DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_SIGMA, 0x0024, tango_fixup_class); -DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_SIGMA, 0x0028, tango_fixup_class); - -/* - * The root complex exposes a "fake" BAR, which is used to filter - * bus-to-system accesses. Only accesses within the range defined by this - * BAR are forwarded to the host, others are ignored. - * - * By default, the DMA framework expects an identity mapping, and DRAM0 is - * mapped at 0x80000000. - */ -static void tango_fixup_bar(struct pci_dev *dev) -{ - dev->non_compliant_bars = true; - pci_write_config_dword(dev, PCI_BASE_ADDRESS_0, 0x80000000); -} -DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_SIGMA, 0x0024, tango_fixup_bar); -DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_SIGMA, 0x0028, tango_fixup_bar);