Re: [PATCH v16 15/22] PCI: microchip: Add event irqchip field to host port and add PLDA irqchip

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> 
> As PLDA dts binding doc(Documentation/devicetree/bindings/pci/
> plda,xpressrich3-axi-common.yaml) showed, PLDA PCIe contains an interrupt
> controller.
> 
> Microchip PolarFire PCIE event IRQs includes PLDA interrupts and Polarfire
> additional interrupts. The interrupt irqchip ops includes ack/mask/unmask
> interrupt ops, which will write correct registers.
> Microchip Polarfire PCIe additional interrupts require to write Polarfire SoC
> self-defined registers. So Microchip PCIe event irqchip ops can not be re-used.
> 
> Microchip Polarfire PCIe additional intrerrupts:
> (defined in drivers/pci/controller/plda/pcie-microchip-host.c)
> EVENT_PCIE_L2_EXIT
> EVENT_PCIE_HOTRST_EXIT
> EVENT_PCIE_DLUP_EXIT
> EVENT_SEC_TX_RAM_SEC_ERR
> EVENT_SEC_RX_RAM_SEC_ERR
> ....
> 
> To support PLDA its own event IRQ process, implements PLDA irqchip ops and
> add event irqchip field to struct pcie_plda_rp.
> 
Hi Thomas
  Could you review this patch? Thanks. 

> Signed-off-by: Minda Chen <minda.chen@xxxxxxxxxxxxxxxx>
> Acked-by: Conor Dooley <conor.dooley@xxxxxxxxxxxxx>
> ---
>  .../pci/controller/plda/pcie-microchip-host.c | 66 ++++++++++++++++++-
>  drivers/pci/controller/plda/pcie-plda.h       | 34 +++++-----
>  2 files changed, 84 insertions(+), 16 deletions(-)
> 
> diff --git a/drivers/pci/controller/plda/pcie-microchip-host.c
> b/drivers/pci/controller/plda/pcie-microchip-host.c
> index b3df373a2141..beaf5c27da84 100644
> --- a/drivers/pci/controller/plda/pcie-microchip-host.c
> +++ b/drivers/pci/controller/plda/pcie-microchip-host.c
> @@ -770,6 +770,64 @@ static struct irq_chip mc_event_irq_chip = {
>  	.irq_unmask = mc_unmask_event_irq,
>  };
> 
> +static u32 plda_hwirq_to_mask(int hwirq) {
> +	u32 mask;
> +
> +	/* hwirq 23 - 0 are the same with register */
> +	if (hwirq < EVENT_PM_MSI_INT_INTX)
> +		mask = BIT(hwirq);
> +	else if (hwirq == EVENT_PM_MSI_INT_INTX)
> +		mask = PM_MSI_INT_INTX_MASK;
> +	else
> +		mask = BIT(hwirq + PCI_NUM_INTX - 1);
> +
> +	return mask;
> +}
> +
> +static void plda_ack_event_irq(struct irq_data *data) {
> +	struct plda_pcie_rp *port = irq_data_get_irq_chip_data(data);
> +
> +	writel_relaxed(plda_hwirq_to_mask(data->hwirq),
> +		       port->bridge_addr + ISTATUS_LOCAL); }
> +
> +static void plda_mask_event_irq(struct irq_data *data) {
> +	struct plda_pcie_rp *port = irq_data_get_irq_chip_data(data);
> +	u32 mask, val;
> +
> +	mask = plda_hwirq_to_mask(data->hwirq);
> +
> +	raw_spin_lock(&port->lock);
> +	val = readl_relaxed(port->bridge_addr + IMASK_LOCAL);
> +	val &= ~mask;
> +	writel_relaxed(val, port->bridge_addr + IMASK_LOCAL);
> +	raw_spin_unlock(&port->lock);
> +}
> +
> +static void plda_unmask_event_irq(struct irq_data *data) {
> +	struct plda_pcie_rp *port = irq_data_get_irq_chip_data(data);
> +	u32 mask, val;
> +
> +	mask = plda_hwirq_to_mask(data->hwirq);
> +
> +	raw_spin_lock(&port->lock);
> +	val = readl_relaxed(port->bridge_addr + IMASK_LOCAL);
> +	val |= mask;
> +	writel_relaxed(val, port->bridge_addr + IMASK_LOCAL);
> +	raw_spin_unlock(&port->lock);
> +}
> +
> +static struct irq_chip plda_event_irq_chip = {
> +	.name = "PLDA PCIe EVENT",
> +	.irq_ack = plda_ack_event_irq,
> +	.irq_mask = plda_mask_event_irq,
> +	.irq_unmask = plda_unmask_event_irq,
> +};
> +
>  static const struct plda_event_ops plda_event_ops = {
>  	.get_events = plda_get_events,
>  };
> @@ -777,7 +835,9 @@ static const struct plda_event_ops plda_event_ops =
> {  static int plda_pcie_event_map(struct irq_domain *domain, unsigned int irq,
>  			       irq_hw_number_t hwirq)
>  {
> -	irq_set_chip_and_handler(irq, &mc_event_irq_chip, handle_level_irq);
> +	struct plda_pcie_rp *port = (void *)domain->host_data;
> +
> +	irq_set_chip_and_handler(irq, port->event_irq_chip, handle_level_irq);
>  	irq_set_chip_data(irq, domain->host_data);
> 
>  	return 0;
> @@ -962,6 +1022,9 @@ static int plda_init_interrupts(struct platform_device
> *pdev,
>  	if (!port->event_ops)
>  		port->event_ops = &plda_event_ops;
> 
> +	if (!port->event_irq_chip)
> +		port->event_irq_chip = &plda_event_irq_chip;
> +
>  	ret = plda_pcie_init_irq_domains(port);
>  	if (ret) {
>  		dev_err(dev, "failed creating IRQ domains\n"); @@ -1039,6 +1102,7
> @@ static int mc_platform_init(struct pci_config_window *cfg)
>  		return ret;
> 
>  	port->plda.event_ops = &mc_event_ops;
> +	port->plda.event_irq_chip = &mc_event_irq_chip;
> 
>  	/* Address translation is up; safe to enable interrupts */
>  	ret = plda_init_interrupts(pdev, &port->plda, &mc_event); diff --git
> a/drivers/pci/controller/plda/pcie-plda.h
> b/drivers/pci/controller/plda/pcie-plda.h
> index e0e5e7cc8434..0e5157eb3a32 100644
> --- a/drivers/pci/controller/plda/pcie-plda.h
> +++ b/drivers/pci/controller/plda/pcie-plda.h
> @@ -107,6 +107,8 @@ enum plda_int_event {
> 
>  #define PLDA_NUM_DMA_EVENTS			16
> 
> +#define EVENT_PM_MSI_INT_INTX			(PLDA_NUM_DMA_EVENTS +
> PLDA_INTX)
> +#define EVENT_PM_MSI_INT_MSI			(PLDA_NUM_DMA_EVENTS +
> PLDA_MSI)
>  #define PLDA_MAX_EVENT_NUM			(PLDA_NUM_DMA_EVENTS +
> PLDA_INT_EVENT_NUM)
> 
>  /*
> @@ -116,21 +118,22 @@ enum plda_int_event {
>   * +--+--+--+-+------+-+-+-+-+-+-+-+-+-----------+-----------+
>   * |12|11|10|9| intx |7|6|5|4|3|2|1|0| DMA error | DMA end   |
>   * +--+--+--+-+------+-+-+-+-+-+-+-+-+-----------+-----------+
> - * bit 0-7  DMA interrupt end : reserved for vendor implement
> - * bit 8-15 DMA error : reserved for vendor implement
> - * 0:  AXI post error (PLDA_AXI_POST_ERR)
> - * 1:  AXI fetch error (PLDA_AXI_FETCH_ERR)
> - * 2:  AXI discard error (PLDA_AXI_DISCARD_ERR)
> - * 3:  AXI doorbell (PLDA_PCIE_DOORBELL)
> - * 4:  PCIe post error (PLDA_PCIE_POST_ERR)
> - * 5:  PCIe fetch error (PLDA_PCIE_FETCH_ERR)
> - * 6:  PCIe discard error (PLDA_PCIE_DISCARD_ERR)
> - * 7:  PCIe doorbell (PLDA_PCIE_DOORBELL)
> - * 8:  4 INTx interruts (PLDA_INTX)
> - * 9:  MSI interrupt (PLDA_MSI)
> - * 10: AER event (PLDA_AER_EVENT)
> - * 11: PM/LTR/Hotplug (PLDA_MISC_EVENTS)
> - * 12: System error (PLDA_SYS_ERR)
> + * event  bit
> + * 0-7   (0-7)   DMA interrupt end : reserved for vendor implement
> + * 8-15  (8-15)  DMA error : reserved for vendor implement
> + * 16    (16)    AXI post error (PLDA_AXI_POST_ERR)
> + * 17    (17)    AXI fetch error (PLDA_AXI_FETCH_ERR)
> + * 18    (18)    AXI discard error (PLDA_AXI_DISCARD_ERR)
> + * 19    (19)    AXI doorbell (PLDA_PCIE_DOORBELL)
> + * 20    (20)    PCIe post error (PLDA_PCIE_POST_ERR)
> + * 21    (21)    PCIe fetch error (PLDA_PCIE_FETCH_ERR)
> + * 22    (22)    PCIe discard error (PLDA_PCIE_DISCARD_ERR)
> + * 23    (23)    PCIe doorbell (PLDA_PCIE_DOORBELL)
> + * 24    (27-24) INTx interruts (PLDA_INTX)
> + * 25    (28):   MSI interrupt (PLDA_MSI)
> + * 26    (29):   AER event (PLDA_AER_EVENT)
> + * 27    (30):   PM/LTR/Hotplug (PLDA_MISC_EVENTS)
> + * 28    (31):   System error (PLDA_SYS_ERR)
>   */
> 
>  struct plda_pcie_rp;
> @@ -155,6 +158,7 @@ struct plda_pcie_rp {
>  	raw_spinlock_t lock;
>  	struct plda_msi msi;
>  	const struct plda_event_ops *event_ops;
> +	const struct irq_chip *event_irq_chip;
>  	void __iomem *bridge_addr;
>  	int num_events;
>  };
> --
> 2.17.1






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