| Message ID | 20231214072839.2367-15-minda.chen@starfivetech.com |
|---|---|
| State | New |
| Headers | show |
| Series | Refactoring Microchip PCIe driver and add StarFive PCIe | expand |
On 2023/12/28 0:31, Lorenzo Pieralisi wrote: > On Thu, Dec 14, 2023 at 03:28:32PM +0800, Minda Chen wrote: >> PolarFire implements its own PCIe interrupts, additional to the regular >> PCIe interrupts, due to lack of an MSI controller, so the interrupt to >> event number mapping is different to the PLDA local interrupts, > > I am sorry I don't understand what you mean here. > > "its own PCIe interrupts" ? > > "regular PCIe interrupts" ? > > "PLDA local interrupts" ? > > Can you spell out what those are referring to please ? > > Thanks, > Lorenzo > "its own PCIe interrupts" ? PolarFire SoC PCIe implement 11 interrupt in their platform. (can be found in pcie-microchip-host.c:87) #define EVENT_PCIE_L2_EXIT 0 #define EVENT_PCIE_HOTRST_EXIT 1 #define EVENT_PCIE_DLUP_EXIT 2 #define EVENT_SEC_TX_RAM_SEC_ERR 3 #define EVENT_SEC_RX_RAM_SEC_ERR 4 #define EVENT_SEC_PCIE2AXI_RAM_SEC_ERR 5 #define EVENT_SEC_AXI2PCIE_RAM_SEC_ERR 6 #define EVENT_DED_TX_RAM_DED_ERR 7 #define EVENT_DED_RX_RAM_DED_ERR 8 #define EVENT_DED_PCIE2AXI_RAM_DED_ERR 9 #define EVENT_DED_AXI2PCIE_RAM_DED_ERR 10 "regular PCIe interrupts" ? "PLDA local interrupts" ? Actually they are the same. I will change this. PLDA interrupt register graph in this patch. >> necessitating a custom get_events() implementation. >> >> plda_get_events() adds interrupt register to PLDA local event num mapping >> codes except DMA engine interrupt events. The DMA engine interrupt events >> are implemented by vendors. >> >> Signed-off-by: Minda Chen <minda.chen@starfivetech.com> >> Acked-by: Conor Dooley <conor.dooley@microchip.com> >> --- >> .../pci/controller/plda/pcie-microchip-host.c | 35 ++++++++++++++++++- >> drivers/pci/controller/plda/pcie-plda.h | 33 +++++++++++++++++ >> 2 files changed, 67 insertions(+), 1 deletion(-) >> >> diff --git a/drivers/pci/controller/plda/pcie-microchip-host.c b/drivers/pci/controller/plda/pcie-microchip-host.c >> index 00250781b11c..fd0d92c3d03f 100644 >> --- a/drivers/pci/controller/plda/pcie-microchip-host.c >> +++ b/drivers/pci/controller/plda/pcie-microchip-host.c >> @@ -627,6 +627,26 @@ static u32 mc_get_events(struct plda_pcie_rp *port) >> return events; >> } >> >> +static u32 plda_get_events(struct plda_pcie_rp *port) >> +{ >> + u32 events, val, origin; >> + >> + origin = readl_relaxed(port->bridge_addr + ISTATUS_LOCAL); >> + >> + /* Error events and doorbell events */ >> + events = (origin & ERROR_AND_DOORBELL_MASK) >> A_ATR_EVT_POST_ERR_SHIFT; >> + >> + /* INTx events */ >> + if (origin & PM_MSI_INT_INTX_MASK) >> + events |= BIT(EVENT_PM_MSI_INT_INTX); >> + >> + /* MSI event and sys events */ >> + val = (origin & SYS_AND_MSI_MASK) >> PM_MSI_INT_MSI_SHIFT; >> + events |= val << EVENT_PM_MSI_INT_MSI; >> + >> + return events; >> +} >> + >> static irqreturn_t mc_event_handler(int irq, void *dev_id) >> { >> struct plda_pcie_rp *port = dev_id; >> @@ -657,7 +677,7 @@ static void plda_handle_event(struct irq_desc *desc) >> >> chained_irq_enter(chip, desc); >> >> - events = mc_get_events(port); >> + events = port->event_ops->get_events(port); >> >> for_each_set_bit(bit, &events, port->num_events) >> generic_handle_domain_irq(port->event_domain, bit); >> @@ -751,6 +771,10 @@ static struct irq_chip mc_event_irq_chip = { >> .irq_unmask = mc_unmask_event_irq, >> }; >> >> +static const struct plda_event_ops plda_event_ops = { >> + .get_events = plda_get_events, >> +}; >> + >> static int plda_pcie_event_map(struct irq_domain *domain, unsigned int irq, >> irq_hw_number_t hwirq) >> { >> @@ -816,6 +840,10 @@ static int mc_request_event_irq(struct plda_pcie_rp *plda, int event_irq, >> 0, event_cause[event].sym, plda); >> } >> >> +static const struct plda_event_ops mc_event_ops = { >> + .get_events = mc_get_events, >> +}; >> + >> static const struct plda_event mc_event = { >> .request_event_irq = mc_request_event_irq, >> .intx_event = EVENT_LOCAL_PM_MSI_INT_INTX, >> @@ -932,6 +960,9 @@ static int plda_init_interrupts(struct platform_device *pdev, >> int i, intx_irq, msi_irq, event_irq; >> int ret; >> >> + if (!port->event_ops) >> + port->event_ops = &plda_event_ops; >> + >> ret = plda_pcie_init_irq_domains(port); >> if (ret) { >> dev_err(dev, "failed creating IRQ domains\n"); >> @@ -1008,6 +1039,8 @@ static int mc_platform_init(struct pci_config_window *cfg) >> if (ret) >> return ret; >> >> + port->plda.event_ops = &mc_event_ops; >> + >> /* Address translation is up; safe to enable interrupts */ >> ret = plda_init_interrupts(pdev, &port->plda, &mc_event); >> if (ret) >> diff --git a/drivers/pci/controller/plda/pcie-plda.h b/drivers/pci/controller/plda/pcie-plda.h >> index fba7343f9a96..dd8bc2750bfc 100644 >> --- a/drivers/pci/controller/plda/pcie-plda.h >> +++ b/drivers/pci/controller/plda/pcie-plda.h >> @@ -40,6 +40,7 @@ >> #define P_ATR_EVT_DISCARD_ERR_SHIFT 22 >> #define P_ATR_EVT_DOORBELL_MASK 0x00000000u >> #define P_ATR_EVT_DOORBELL_SHIFT 23 >> +#define ERROR_AND_DOORBELL_MASK GENMASK(23, 16) >> #define PM_MSI_INT_INTA_MASK 0x01000000u >> #define PM_MSI_INT_INTA_SHIFT 24 >> #define PM_MSI_INT_INTB_MASK 0x02000000u >> @@ -58,6 +59,7 @@ >> #define PM_MSI_INT_EVENTS_SHIFT 30 >> #define PM_MSI_INT_SYS_ERR_MASK 0x80000000u >> #define PM_MSI_INT_SYS_ERR_SHIFT 31 >> +#define SYS_AND_MSI_MASK GENMASK(31, 28) >> #define NUM_LOCAL_EVENTS 15 >> #define ISTATUS_LOCAL 0x184 >> #define IMASK_HOST 0x188 >> @@ -102,6 +104,36 @@ >> #define EVENT_PM_MSI_INT_SYS_ERR 12 >> #define NUM_PLDA_EVENTS 13 >> >> +/* >> + * PLDA local interrupt register >> + * >> + * 31 27 23 15 7 0 >> + * +--+--+--+-+------+-+-+-+-+-+-+-+-+-----------+-----------+ >> + * |12|11|10|9| intx |7|6|5|4|3|2|1|0| DMA error | DMA end | >> + * +--+--+--+-+------+-+-+-+-+-+-+-+-+-----------+-----------+ >> + * 0: AXI post error >> + * 1: AXI fetch error >> + * 2: AXI discard error >> + * 3: AXI doorbell >> + * 4: PCIe post error >> + * 5: PCIe fetch error >> + * 6: PCIe discard error >> + * 7: PCIe doorbell >> + * 8: 4 INTx interruts >> + * 9: MSI interrupt >> + * 10: AER event >> + * 11: PM/LTR/Hotplug >> + * 12: System error >> + * DMA error : reserved for vendor implement >> + * DMA end : reserved for vendor implement >> + */ "PLDA local interrupts" ? They are all the PLDA PCIe interrupts . >> + >> +struct plda_pcie_rp; >> + >> +struct plda_event_ops { >> + u32 (*get_events)(struct plda_pcie_rp *pcie); >> +}; >> + >> struct plda_msi { >> struct mutex lock; /* Protect used bitmap */ >> struct irq_domain *msi_domain; >> @@ -117,6 +149,7 @@ struct plda_pcie_rp { >> struct irq_domain *event_domain; >> raw_spinlock_t lock; >> struct plda_msi msi; >> + const struct plda_event_ops *event_ops; >> void __iomem *bridge_addr; >> int num_events; >> }; >> -- >> 2.17.1 >>
diff --git a/drivers/pci/controller/plda/pcie-microchip-host.c b/drivers/pci/controller/plda/pcie-microchip-host.c index 00250781b11c..fd0d92c3d03f 100644 --- a/drivers/pci/controller/plda/pcie-microchip-host.c +++ b/drivers/pci/controller/plda/pcie-microchip-host.c @@ -627,6 +627,26 @@ static u32 mc_get_events(struct plda_pcie_rp *port) return events; } +static u32 plda_get_events(struct plda_pcie_rp *port) +{ + u32 events, val, origin; + + origin = readl_relaxed(port->bridge_addr + ISTATUS_LOCAL); + + /* Error events and doorbell events */ + events = (origin & ERROR_AND_DOORBELL_MASK) >> A_ATR_EVT_POST_ERR_SHIFT; + + /* INTx events */ + if (origin & PM_MSI_INT_INTX_MASK) + events |= BIT(EVENT_PM_MSI_INT_INTX); + + /* MSI event and sys events */ + val = (origin & SYS_AND_MSI_MASK) >> PM_MSI_INT_MSI_SHIFT; + events |= val << EVENT_PM_MSI_INT_MSI; + + return events; +} + static irqreturn_t mc_event_handler(int irq, void *dev_id) { struct plda_pcie_rp *port = dev_id; @@ -657,7 +677,7 @@ static void plda_handle_event(struct irq_desc *desc) chained_irq_enter(chip, desc); - events = mc_get_events(port); + events = port->event_ops->get_events(port); for_each_set_bit(bit, &events, port->num_events) generic_handle_domain_irq(port->event_domain, bit); @@ -751,6 +771,10 @@ static struct irq_chip mc_event_irq_chip = { .irq_unmask = mc_unmask_event_irq, }; +static const struct plda_event_ops plda_event_ops = { + .get_events = plda_get_events, +}; + static int plda_pcie_event_map(struct irq_domain *domain, unsigned int irq, irq_hw_number_t hwirq) { @@ -816,6 +840,10 @@ static int mc_request_event_irq(struct plda_pcie_rp *plda, int event_irq, 0, event_cause[event].sym, plda); } +static const struct plda_event_ops mc_event_ops = { + .get_events = mc_get_events, +}; + static const struct plda_event mc_event = { .request_event_irq = mc_request_event_irq, .intx_event = EVENT_LOCAL_PM_MSI_INT_INTX, @@ -932,6 +960,9 @@ static int plda_init_interrupts(struct platform_device *pdev, int i, intx_irq, msi_irq, event_irq; int ret; + if (!port->event_ops) + port->event_ops = &plda_event_ops; + ret = plda_pcie_init_irq_domains(port); if (ret) { dev_err(dev, "failed creating IRQ domains\n"); @@ -1008,6 +1039,8 @@ static int mc_platform_init(struct pci_config_window *cfg) if (ret) return ret; + port->plda.event_ops = &mc_event_ops; + /* Address translation is up; safe to enable interrupts */ ret = plda_init_interrupts(pdev, &port->plda, &mc_event); if (ret) diff --git a/drivers/pci/controller/plda/pcie-plda.h b/drivers/pci/controller/plda/pcie-plda.h index fba7343f9a96..dd8bc2750bfc 100644 --- a/drivers/pci/controller/plda/pcie-plda.h +++ b/drivers/pci/controller/plda/pcie-plda.h @@ -40,6 +40,7 @@ #define P_ATR_EVT_DISCARD_ERR_SHIFT 22 #define P_ATR_EVT_DOORBELL_MASK 0x00000000u #define P_ATR_EVT_DOORBELL_SHIFT 23 +#define ERROR_AND_DOORBELL_MASK GENMASK(23, 16) #define PM_MSI_INT_INTA_MASK 0x01000000u #define PM_MSI_INT_INTA_SHIFT 24 #define PM_MSI_INT_INTB_MASK 0x02000000u @@ -58,6 +59,7 @@ #define PM_MSI_INT_EVENTS_SHIFT 30 #define PM_MSI_INT_SYS_ERR_MASK 0x80000000u #define PM_MSI_INT_SYS_ERR_SHIFT 31 +#define SYS_AND_MSI_MASK GENMASK(31, 28) #define NUM_LOCAL_EVENTS 15 #define ISTATUS_LOCAL 0x184 #define IMASK_HOST 0x188 @@ -102,6 +104,36 @@ #define EVENT_PM_MSI_INT_SYS_ERR 12 #define NUM_PLDA_EVENTS 13 +/* + * PLDA local interrupt register + * + * 31 27 23 15 7 0 + * +--+--+--+-+------+-+-+-+-+-+-+-+-+-----------+-----------+ + * |12|11|10|9| intx |7|6|5|4|3|2|1|0| DMA error | DMA end | + * +--+--+--+-+------+-+-+-+-+-+-+-+-+-----------+-----------+ + * 0: AXI post error + * 1: AXI fetch error + * 2: AXI discard error + * 3: AXI doorbell + * 4: PCIe post error + * 5: PCIe fetch error + * 6: PCIe discard error + * 7: PCIe doorbell + * 8: 4 INTx interruts + * 9: MSI interrupt + * 10: AER event + * 11: PM/LTR/Hotplug + * 12: System error + * DMA error : reserved for vendor implement + * DMA end : reserved for vendor implement + */ + +struct plda_pcie_rp; + +struct plda_event_ops { + u32 (*get_events)(struct plda_pcie_rp *pcie); +}; + struct plda_msi { struct mutex lock; /* Protect used bitmap */ struct irq_domain *msi_domain; @@ -117,6 +149,7 @@ struct plda_pcie_rp { struct irq_domain *event_domain; raw_spinlock_t lock; struct plda_msi msi; + const struct plda_event_ops *event_ops; void __iomem *bridge_addr; int num_events; };