| Message ID | 20171030124221.20690-7-niklas.cassel@axis.com (mailing list archive) |
|---|---|
| State | New, archived |
| Delegated to: | Bjorn Helgaas |
| Headers | show |
Hi, On Monday 30 October 2017 06:12 PM, Niklas Cassel wrote: > This function can be used by all DWC based controllers to raise a MSI > irq. However, certain controllers, like DRA7xx, has a special > convenience register for raising MSI irqs that doesn't require you to > explicitly map the MSI address. > > Signed-off-by: Niklas Cassel <niklas.cassel@axis.com> > --- > V2: > * New patch in this series. The other changes in the changelog are against > the version that was included in pcie-artpec6.c in V1. > * raise_msi_irq now uses readw/writew instead of masking. > * raise_msi_irq now uses fixed offset for MSI cap in raise_msi, since it is > always at the same offset for this IP. > * raise_msi_irq now uses PCI_MSI_FLAGS_64BIT rather than BIT(7). > > drivers/pci/dwc/pcie-designware-ep.c | 34 ++++++++++++++++++++++++++++++++++ > drivers/pci/dwc/pcie-designware.h | 9 +++++++++ > 2 files changed, 43 insertions(+) > > diff --git a/drivers/pci/dwc/pcie-designware-ep.c b/drivers/pci/dwc/pcie-designware-ep.c > index 47134a85a342..92b7ca36bae4 100644 > --- a/drivers/pci/dwc/pcie-designware-ep.c > +++ b/drivers/pci/dwc/pcie-designware-ep.c > @@ -282,6 +282,40 @@ static const struct pci_epc_ops epc_ops = { > .stop = dw_pcie_ep_stop, > }; > > +int dw_pcie_ep_raise_msi_irq(struct dw_pcie_ep *ep, > + u8 interrupt_num) > +{ > + struct dw_pcie *pci = to_dw_pcie_from_ep(ep); > + struct pci_epc *epc = ep->epc; > + u16 msg_ctrl, msg_data; > + u32 msg_addr_lower, msg_addr_upper; > + u64 msg_addr; > + bool has_upper; > + int ret; > + > + /* Raise MSI per the PCI Local Bus Specification Revision 3.0, 6.8.1. */ > + msg_ctrl = dw_pcie_readw_dbi(pci, MSI_MESSAGE_CONTROL); > + has_upper = !!(msg_ctrl & PCI_MSI_FLAGS_64BIT); > + msg_addr_lower = dw_pcie_readl_dbi(pci, MSI_MESSAGE_ADDR_L32); > + if (has_upper) { > + msg_addr_upper = dw_pcie_readl_dbi(pci, MSI_MESSAGE_ADDR_U32); > + msg_data = dw_pcie_readw_dbi(pci, MSI_MESSAGE_DATA_64); > + } else { > + msg_addr_upper = 0; > + msg_data = dw_pcie_readw_dbi(pci, MSI_MESSAGE_DATA_32); > + } > + msg_addr = ((u64) msg_addr_upper) << 32 | msg_addr_lower; > + ret = dw_pcie_ep_map_addr(epc, ep->msi_mem_phys, msg_addr, PAGE_SIZE); > + if (ret) > + return ret; > + > + writel(msg_data | (interrupt_num - 1), ep->msi_mem); > + > + dw_pcie_ep_unmap_addr(epc, ep->msi_mem_phys); > + > + return 0; > +} > + > void dw_pcie_ep_exit(struct dw_pcie_ep *ep) > { > struct pci_epc *epc = ep->epc; > diff --git a/drivers/pci/dwc/pcie-designware.h b/drivers/pci/dwc/pcie-designware.h > index 37dfad8d003f..24edac035160 100644 > --- a/drivers/pci/dwc/pcie-designware.h > +++ b/drivers/pci/dwc/pcie-designware.h > @@ -106,6 +106,8 @@ > #define MSI_CAP_MME_MASK (7 << MSI_CAP_MME_SHIFT) > #define MSI_MESSAGE_ADDR_L32 0x54 > #define MSI_MESSAGE_ADDR_U32 0x58 > +#define MSI_MESSAGE_DATA_32 0x58 Does ADDR_U32 and DATA_32 share the same offset? (in dra7xx MSI_64_EN is hardwired to 1 so I can't know this for sure.) Thanks Kishon
On 10/31/2017 07:22 AM, Kishon Vijay Abraham I wrote: (snip) >> --- a/drivers/pci/dwc/pcie-designware.h >> +++ b/drivers/pci/dwc/pcie-designware.h >> @@ -106,6 +106,8 @@ >> #define MSI_CAP_MME_MASK (7 << MSI_CAP_MME_SHIFT) >> #define MSI_MESSAGE_ADDR_L32 0x54 >> #define MSI_MESSAGE_ADDR_U32 0x58 >> +#define MSI_MESSAGE_DATA_32 0x58 > > Does ADDR_U32 and DATA_32 share the same offset? (in dra7xx MSI_64_EN is > hardwired to 1 so I can't know this for sure.) > Hello Kishon, Yes, they do. The information in the register depends on if the bit MSI_64_EN is set or not. There exists defines for this also in the generic uapi header pci_regs.h, however, utilizing that header would be a separate patch. $ grep -E "MSI_DATA|MSI_MASK" include/uapi/linux/pci_regs.h #define PCI_MSI_DATA_32 8 /* 16 bits of data for 32-bit devices */ #define PCI_MSI_MASK_32 12 /* Mask bits register for 32-bit devices */ #define PCI_MSI_DATA_64 12 /* 16 bits of data for 64-bit devices */ #define PCI_MSI_MASK_64 16 /* Mask bits register for 64-bit devices */ Regards, Niklas
diff --git a/drivers/pci/dwc/pcie-designware-ep.c b/drivers/pci/dwc/pcie-designware-ep.c index 47134a85a342..92b7ca36bae4 100644 --- a/drivers/pci/dwc/pcie-designware-ep.c +++ b/drivers/pci/dwc/pcie-designware-ep.c @@ -282,6 +282,40 @@ static const struct pci_epc_ops epc_ops = { .stop = dw_pcie_ep_stop, }; +int dw_pcie_ep_raise_msi_irq(struct dw_pcie_ep *ep, + u8 interrupt_num) +{ + struct dw_pcie *pci = to_dw_pcie_from_ep(ep); + struct pci_epc *epc = ep->epc; + u16 msg_ctrl, msg_data; + u32 msg_addr_lower, msg_addr_upper; + u64 msg_addr; + bool has_upper; + int ret; + + /* Raise MSI per the PCI Local Bus Specification Revision 3.0, 6.8.1. */ + msg_ctrl = dw_pcie_readw_dbi(pci, MSI_MESSAGE_CONTROL); + has_upper = !!(msg_ctrl & PCI_MSI_FLAGS_64BIT); + msg_addr_lower = dw_pcie_readl_dbi(pci, MSI_MESSAGE_ADDR_L32); + if (has_upper) { + msg_addr_upper = dw_pcie_readl_dbi(pci, MSI_MESSAGE_ADDR_U32); + msg_data = dw_pcie_readw_dbi(pci, MSI_MESSAGE_DATA_64); + } else { + msg_addr_upper = 0; + msg_data = dw_pcie_readw_dbi(pci, MSI_MESSAGE_DATA_32); + } + msg_addr = ((u64) msg_addr_upper) << 32 | msg_addr_lower; + ret = dw_pcie_ep_map_addr(epc, ep->msi_mem_phys, msg_addr, PAGE_SIZE); + if (ret) + return ret; + + writel(msg_data | (interrupt_num - 1), ep->msi_mem); + + dw_pcie_ep_unmap_addr(epc, ep->msi_mem_phys); + + return 0; +} + void dw_pcie_ep_exit(struct dw_pcie_ep *ep) { struct pci_epc *epc = ep->epc; diff --git a/drivers/pci/dwc/pcie-designware.h b/drivers/pci/dwc/pcie-designware.h index 37dfad8d003f..24edac035160 100644 --- a/drivers/pci/dwc/pcie-designware.h +++ b/drivers/pci/dwc/pcie-designware.h @@ -106,6 +106,8 @@ #define MSI_CAP_MME_MASK (7 << MSI_CAP_MME_SHIFT) #define MSI_MESSAGE_ADDR_L32 0x54 #define MSI_MESSAGE_ADDR_U32 0x58 +#define MSI_MESSAGE_DATA_32 0x58 +#define MSI_MESSAGE_DATA_64 0x5C /* * Maximum number of MSI IRQs can be 256 per controller. But keep @@ -338,6 +340,7 @@ static inline int dw_pcie_host_init(struct pcie_port *pp) void dw_pcie_ep_linkup(struct dw_pcie_ep *ep); int dw_pcie_ep_init(struct dw_pcie_ep *ep); void dw_pcie_ep_exit(struct dw_pcie_ep *ep); +int dw_pcie_ep_raise_msi_irq(struct dw_pcie_ep *ep, u8 interrupt_num); void dw_pcie_ep_reset_bar(struct dw_pcie *pci, enum pci_barno bar); #else static inline void dw_pcie_ep_linkup(struct dw_pcie_ep *ep) @@ -353,6 +356,12 @@ static inline void dw_pcie_ep_exit(struct dw_pcie_ep *ep) { } +static inline int dw_pcie_ep_raise_msi_irq(struct dw_pcie_ep *ep, + u8 interrupt_num) +{ + return 0; +} + static inline void dw_pcie_ep_reset_bar(struct dw_pcie *pci, enum pci_barno bar) { }
This function can be used by all DWC based controllers to raise a MSI irq. However, certain controllers, like DRA7xx, has a special convenience register for raising MSI irqs that doesn't require you to explicitly map the MSI address. Signed-off-by: Niklas Cassel <niklas.cassel@axis.com> --- V2: * New patch in this series. The other changes in the changelog are against the version that was included in pcie-artpec6.c in V1. * raise_msi_irq now uses readw/writew instead of masking. * raise_msi_irq now uses fixed offset for MSI cap in raise_msi, since it is always at the same offset for this IP. * raise_msi_irq now uses PCI_MSI_FLAGS_64BIT rather than BIT(7). drivers/pci/dwc/pcie-designware-ep.c | 34 ++++++++++++++++++++++++++++++++++ drivers/pci/dwc/pcie-designware.h | 9 +++++++++ 2 files changed, 43 insertions(+)