| Message ID | 20230111125323.1911373-8-daire.mcnamara@microchip.com |
|---|---|
| State | New |
| Headers | show |
| Series | PCI: microchip: Partition address translations | expand |
On Wed, Jan 11, 2023 at 12:53:19PM +0000, daire.mcnamara@microchip.com wrote: > From: Daire McNamara <daire.mcnamara@microchip.com> > > The PCIe Root Complex on PolarFire SoC is configured at bitstream creation > time using Libero. Key MSI-related parameters include the number of > MSIs (1/2/4/8/16/32) and the MSI address. In the device driver, extract > this information from hw registers at init time, and use it to configure > MSI system, including configuring MSI capability structure correctly in > configuration space. I don't understand whether this is backward compatible with all existing host controllers in the field. I assume MSI parameters can always been probed and that has been always the case for all controllers supported based on this design, please confirm before I proceed with the review. Thanks, Lorenzo > Signed-off-by: Daire McNamara <daire.mcnamara@microchip.com> > Reviewed-by: Conor Dooley <conor.dooley@microchip.com> > --- > drivers/pci/controller/pcie-microchip-host.c | 73 +++++++++++--------- > 1 file changed, 40 insertions(+), 33 deletions(-) > > diff --git a/drivers/pci/controller/pcie-microchip-host.c b/drivers/pci/controller/pcie-microchip-host.c > index 751f0243deb4..9ff0fb04b953 100644 > --- a/drivers/pci/controller/pcie-microchip-host.c > +++ b/drivers/pci/controller/pcie-microchip-host.c > @@ -20,8 +20,7 @@ > #include "../pci.h" > > /* Number of MSI IRQs */ > -#define MC_NUM_MSI_IRQS 32 > -#define MC_NUM_MSI_IRQS_CODED 5 > +#define MC_MAX_NUM_MSI_IRQS 32 > > /* PCIe Bridge Phy and Controller Phy offsets */ > #define MC_PCIE1_BRIDGE_ADDR 0x00008000u > @@ -31,6 +30,11 @@ > #define MC_PCIE_CTRL_ADDR (MC_PCIE1_CTRL_ADDR) > > /* PCIe Bridge Phy Regs */ > +#define PCIE_PCI_IRQ_DW0 0xa8 > +#define MSIX_CAP_MASK BIT(31) > +#define NUM_MSI_MSGS_MASK GENMASK(6, 4) > +#define NUM_MSI_MSGS_SHIFT 4 > + > #define IMASK_LOCAL 0x180 > #define DMA_END_ENGINE_0_MASK 0x00000000u > #define DMA_END_ENGINE_0_SHIFT 0 > @@ -79,7 +83,6 @@ > #define IMASK_HOST 0x188 > #define ISTATUS_HOST 0x18c > #define IMSI_ADDR 0x190 > -#define MSI_ADDR 0x190 > #define ISTATUS_MSI 0x194 > > /* PCIe Master table init defines */ > @@ -158,8 +161,6 @@ > > /* PCIe Config space MSI capability structure */ > #define MC_MSI_CAP_CTRL_OFFSET 0xe0u > -#define MC_MSI_MAX_Q_AVAIL (MC_NUM_MSI_IRQS_CODED << 1) > -#define MC_MSI_Q_SIZE (MC_NUM_MSI_IRQS_CODED << 4) > > /* Events */ > #define EVENT_PCIE_L2_EXIT 0 > @@ -259,7 +260,7 @@ struct mc_msi { > struct irq_domain *dev_domain; > u32 num_vectors; > u64 vector_phy; > - DECLARE_BITMAP(used, MC_NUM_MSI_IRQS); > + DECLARE_BITMAP(used, MC_MAX_NUM_MSI_IRQS); > }; > > struct mc_pcie { > @@ -382,25 +383,29 @@ static struct { > > static char poss_clks[][5] = { "fic0", "fic1", "fic2", "fic3" }; > > -static void mc_pcie_enable_msi(struct mc_pcie *port, void __iomem *base) > +static void mc_pcie_fixup_ecam(struct mc_pcie *port, void __iomem *ecam) > { > struct mc_msi *msi = &port->msi; > - u32 cap_offset = MC_MSI_CAP_CTRL_OFFSET; > - u16 msg_ctrl = readw_relaxed(base + cap_offset + PCI_MSI_FLAGS); > - > - msg_ctrl |= PCI_MSI_FLAGS_ENABLE; > - msg_ctrl &= ~PCI_MSI_FLAGS_QMASK; > - msg_ctrl |= MC_MSI_MAX_Q_AVAIL; > - msg_ctrl &= ~PCI_MSI_FLAGS_QSIZE; > - msg_ctrl |= MC_MSI_Q_SIZE; > - msg_ctrl |= PCI_MSI_FLAGS_64BIT; > - > - writew_relaxed(msg_ctrl, base + cap_offset + PCI_MSI_FLAGS); > - > + u16 reg; > + u8 queue_size; > + > + /* Fixup MSI enable flag */ > + reg = readw_relaxed(ecam + MC_MSI_CAP_CTRL_OFFSET + PCI_MSI_FLAGS); > + reg |= PCI_MSI_FLAGS_ENABLE; > + writew_relaxed(reg, ecam + MC_MSI_CAP_CTRL_OFFSET + PCI_MSI_FLAGS); > + > + /* Fixup PCI MSI queue flags */ > + queue_size = reg & PCI_MSI_FLAGS_QMASK; > + queue_size >>= 1; > + reg &= ~PCI_MSI_FLAGS_QSIZE; > + reg |= queue_size << 4; > + writew_relaxed(reg, ecam + MC_MSI_CAP_CTRL_OFFSET + PCI_MSI_FLAGS); > + > + /* Fixup MSI addr fields */ > writel_relaxed(lower_32_bits(msi->vector_phy), > - base + cap_offset + PCI_MSI_ADDRESS_LO); > + ecam + MC_MSI_CAP_CTRL_OFFSET + PCI_MSI_ADDRESS_LO); > writel_relaxed(upper_32_bits(msi->vector_phy), > - base + cap_offset + PCI_MSI_ADDRESS_HI); > + ecam + MC_MSI_CAP_CTRL_OFFSET + PCI_MSI_ADDRESS_HI); > } > > static void mc_handle_msi(struct irq_desc *desc) > @@ -473,10 +478,7 @@ static int mc_irq_msi_domain_alloc(struct irq_domain *domain, unsigned int virq, > { > struct mc_pcie *port = domain->host_data; > struct mc_msi *msi = &port->msi; > - void __iomem *bridge_base_addr = > - port->axi_base_addr + MC_PCIE_BRIDGE_ADDR; > unsigned long bit; > - u32 val; > > mutex_lock(&msi->lock); > bit = find_first_zero_bit(msi->used, msi->num_vectors); > @@ -490,11 +492,6 @@ static int mc_irq_msi_domain_alloc(struct irq_domain *domain, unsigned int virq, > irq_domain_set_info(domain, virq, bit, &mc_msi_bottom_irq_chip, > domain->host_data, handle_edge_irq, NULL, NULL); > > - /* Enable MSI interrupts */ > - val = readl_relaxed(bridge_base_addr + IMASK_LOCAL); > - val |= PM_MSI_INT_MSI_MASK; > - writel_relaxed(val, bridge_base_addr + IMASK_LOCAL); > - > mutex_unlock(&msi->lock); > > return 0; > @@ -1117,6 +1114,7 @@ static int mc_platform_init(struct pci_config_window *cfg) > struct mc_pcie *port; > void __iomem *bridge_base_addr; > int ret; > + u32 val; > > port = devm_kzalloc(dev, sizeof(*port), GFP_KERNEL); > if (!port) > @@ -1137,11 +1135,20 @@ static int mc_platform_init(struct pci_config_window *cfg) > > bridge_base_addr = port->axi_base_addr + MC_PCIE_BRIDGE_ADDR; > > - port->msi.vector_phy = MSI_ADDR; > - port->msi.num_vectors = MC_NUM_MSI_IRQS; > + /* Allow enabling MSI by disabling MSI-X */ > + val = readl(bridge_base_addr + PCIE_PCI_IRQ_DW0); > + val &= ~MSIX_CAP_MASK; > + writel(val, bridge_base_addr + PCIE_PCI_IRQ_DW0); > + > + /* Pick num vectors from bitfile programmed onto FPGA fabric */ > + val = readl(bridge_base_addr + PCIE_PCI_IRQ_DW0); > + val &= NUM_MSI_MSGS_MASK; > + val >>= NUM_MSI_MSGS_SHIFT; > + > + port->msi.num_vectors = 1 << val; > > - /* Hardware doesn't setup MSI by default */ > - mc_pcie_enable_msi(port, cfg->win); > + /* Pick vector address from design */ > + port->msi.vector_phy = readl_relaxed(bridge_base_addr + IMSI_ADDR); > > /* Configure Address Translation Table 0 for PCIe config space */ > mc_pcie_setup_window(bridge_base_addr, 0, cfg->res.start & 0xffffffff, > -- > 2.25.1 > > > _______________________________________________ > linux-riscv mailing list > linux-riscv@lists.infradead.org > http://lists.infradead.org/mailman/listinfo/linux-riscv
diff --git a/drivers/pci/controller/pcie-microchip-host.c b/drivers/pci/controller/pcie-microchip-host.c index 751f0243deb4..9ff0fb04b953 100644 --- a/drivers/pci/controller/pcie-microchip-host.c +++ b/drivers/pci/controller/pcie-microchip-host.c @@ -20,8 +20,7 @@ #include "../pci.h" /* Number of MSI IRQs */ -#define MC_NUM_MSI_IRQS 32 -#define MC_NUM_MSI_IRQS_CODED 5 +#define MC_MAX_NUM_MSI_IRQS 32 /* PCIe Bridge Phy and Controller Phy offsets */ #define MC_PCIE1_BRIDGE_ADDR 0x00008000u @@ -31,6 +30,11 @@ #define MC_PCIE_CTRL_ADDR (MC_PCIE1_CTRL_ADDR) /* PCIe Bridge Phy Regs */ +#define PCIE_PCI_IRQ_DW0 0xa8 +#define MSIX_CAP_MASK BIT(31) +#define NUM_MSI_MSGS_MASK GENMASK(6, 4) +#define NUM_MSI_MSGS_SHIFT 4 + #define IMASK_LOCAL 0x180 #define DMA_END_ENGINE_0_MASK 0x00000000u #define DMA_END_ENGINE_0_SHIFT 0 @@ -79,7 +83,6 @@ #define IMASK_HOST 0x188 #define ISTATUS_HOST 0x18c #define IMSI_ADDR 0x190 -#define MSI_ADDR 0x190 #define ISTATUS_MSI 0x194 /* PCIe Master table init defines */ @@ -158,8 +161,6 @@ /* PCIe Config space MSI capability structure */ #define MC_MSI_CAP_CTRL_OFFSET 0xe0u -#define MC_MSI_MAX_Q_AVAIL (MC_NUM_MSI_IRQS_CODED << 1) -#define MC_MSI_Q_SIZE (MC_NUM_MSI_IRQS_CODED << 4) /* Events */ #define EVENT_PCIE_L2_EXIT 0 @@ -259,7 +260,7 @@ struct mc_msi { struct irq_domain *dev_domain; u32 num_vectors; u64 vector_phy; - DECLARE_BITMAP(used, MC_NUM_MSI_IRQS); + DECLARE_BITMAP(used, MC_MAX_NUM_MSI_IRQS); }; struct mc_pcie { @@ -382,25 +383,29 @@ static struct { static char poss_clks[][5] = { "fic0", "fic1", "fic2", "fic3" }; -static void mc_pcie_enable_msi(struct mc_pcie *port, void __iomem *base) +static void mc_pcie_fixup_ecam(struct mc_pcie *port, void __iomem *ecam) { struct mc_msi *msi = &port->msi; - u32 cap_offset = MC_MSI_CAP_CTRL_OFFSET; - u16 msg_ctrl = readw_relaxed(base + cap_offset + PCI_MSI_FLAGS); - - msg_ctrl |= PCI_MSI_FLAGS_ENABLE; - msg_ctrl &= ~PCI_MSI_FLAGS_QMASK; - msg_ctrl |= MC_MSI_MAX_Q_AVAIL; - msg_ctrl &= ~PCI_MSI_FLAGS_QSIZE; - msg_ctrl |= MC_MSI_Q_SIZE; - msg_ctrl |= PCI_MSI_FLAGS_64BIT; - - writew_relaxed(msg_ctrl, base + cap_offset + PCI_MSI_FLAGS); - + u16 reg; + u8 queue_size; + + /* Fixup MSI enable flag */ + reg = readw_relaxed(ecam + MC_MSI_CAP_CTRL_OFFSET + PCI_MSI_FLAGS); + reg |= PCI_MSI_FLAGS_ENABLE; + writew_relaxed(reg, ecam + MC_MSI_CAP_CTRL_OFFSET + PCI_MSI_FLAGS); + + /* Fixup PCI MSI queue flags */ + queue_size = reg & PCI_MSI_FLAGS_QMASK; + queue_size >>= 1; + reg &= ~PCI_MSI_FLAGS_QSIZE; + reg |= queue_size << 4; + writew_relaxed(reg, ecam + MC_MSI_CAP_CTRL_OFFSET + PCI_MSI_FLAGS); + + /* Fixup MSI addr fields */ writel_relaxed(lower_32_bits(msi->vector_phy), - base + cap_offset + PCI_MSI_ADDRESS_LO); + ecam + MC_MSI_CAP_CTRL_OFFSET + PCI_MSI_ADDRESS_LO); writel_relaxed(upper_32_bits(msi->vector_phy), - base + cap_offset + PCI_MSI_ADDRESS_HI); + ecam + MC_MSI_CAP_CTRL_OFFSET + PCI_MSI_ADDRESS_HI); } static void mc_handle_msi(struct irq_desc *desc) @@ -473,10 +478,7 @@ static int mc_irq_msi_domain_alloc(struct irq_domain *domain, unsigned int virq, { struct mc_pcie *port = domain->host_data; struct mc_msi *msi = &port->msi; - void __iomem *bridge_base_addr = - port->axi_base_addr + MC_PCIE_BRIDGE_ADDR; unsigned long bit; - u32 val; mutex_lock(&msi->lock); bit = find_first_zero_bit(msi->used, msi->num_vectors); @@ -490,11 +492,6 @@ static int mc_irq_msi_domain_alloc(struct irq_domain *domain, unsigned int virq, irq_domain_set_info(domain, virq, bit, &mc_msi_bottom_irq_chip, domain->host_data, handle_edge_irq, NULL, NULL); - /* Enable MSI interrupts */ - val = readl_relaxed(bridge_base_addr + IMASK_LOCAL); - val |= PM_MSI_INT_MSI_MASK; - writel_relaxed(val, bridge_base_addr + IMASK_LOCAL); - mutex_unlock(&msi->lock); return 0; @@ -1117,6 +1114,7 @@ static int mc_platform_init(struct pci_config_window *cfg) struct mc_pcie *port; void __iomem *bridge_base_addr; int ret; + u32 val; port = devm_kzalloc(dev, sizeof(*port), GFP_KERNEL); if (!port) @@ -1137,11 +1135,20 @@ static int mc_platform_init(struct pci_config_window *cfg) bridge_base_addr = port->axi_base_addr + MC_PCIE_BRIDGE_ADDR; - port->msi.vector_phy = MSI_ADDR; - port->msi.num_vectors = MC_NUM_MSI_IRQS; + /* Allow enabling MSI by disabling MSI-X */ + val = readl(bridge_base_addr + PCIE_PCI_IRQ_DW0); + val &= ~MSIX_CAP_MASK; + writel(val, bridge_base_addr + PCIE_PCI_IRQ_DW0); + + /* Pick num vectors from bitfile programmed onto FPGA fabric */ + val = readl(bridge_base_addr + PCIE_PCI_IRQ_DW0); + val &= NUM_MSI_MSGS_MASK; + val >>= NUM_MSI_MSGS_SHIFT; + + port->msi.num_vectors = 1 << val; - /* Hardware doesn't setup MSI by default */ - mc_pcie_enable_msi(port, cfg->win); + /* Pick vector address from design */ + port->msi.vector_phy = readl_relaxed(bridge_base_addr + IMSI_ADDR); /* Configure Address Translation Table 0 for PCIe config space */ mc_pcie_setup_window(bridge_base_addr, 0, cfg->res.start & 0xffffffff,