Re: [PATCH v6 08/19] PCI: plda: Add event interrupt codes and IRQ domain ops

[Conor Dooley <conor@kernel.org>]

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On Fri, Sep 15, 2023 at 06:22:32PM +0800, Minda Chen wrote:
> For PolarFire implements non-PLDA local interrupt events, most of
> event interrupt process codes can not be re-used. PLDA implements
> new codes and IRQ domain ops like PolarFire.
> 
> plda_get_events() adds a new IRQ num to event num mapping codes for
> PLDA local event except DMA engine interrupt events. The DMA engine
> interrupt events are implemented by vendors.
> 
> Signed-off-by: Minda Chen <minda.chen@starfivetech.com>

Perhaps not important as they will go away in the next patch, but for
this patch the riscv patchwork stuff noticed:
drivers/pci/controller/plda/pcie-plda-host.c:114:36: warning: unused variable 'plda_evt_dom_ops' [-Wunused-const-variable]
drivers/pci/controller/plda/pcie-plda-host.c:118:36: warning: unused variable 'plda_event_ops' [-Wunused-const-variable]

Cheers,
Conor.

> ---
>  drivers/pci/controller/plda/pcie-plda-host.c | 99 ++++++++++++++++++++
>  drivers/pci/controller/plda/pcie-plda.h      | 33 +++++++
>  2 files changed, 132 insertions(+)
> 
> diff --git a/drivers/pci/controller/plda/pcie-plda-host.c b/drivers/pci/controller/plda/pcie-plda-host.c
> index f0c7636f1f64..f29ff0f00dda 100644
> --- a/drivers/pci/controller/plda/pcie-plda-host.c
> +++ b/drivers/pci/controller/plda/pcie-plda-host.c
> @@ -20,6 +20,105 @@
>  
>  #include "pcie-plda.h"
>  
> +irqreturn_t plda_event_handler(int irq, void *dev_id)
> +{
> +	return IRQ_HANDLED;
> +}
> +
> +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 >> A_ATR_EVT_POST_ERR_SHIFT) & 0xff;
> +
> +	/* INTx events */
> +	if (origin & PM_MSI_INT_INTX_MASK)
> +		events |= BIT(EVENT_PM_MSI_INT_INTX);
> +
> +	/* MSI event and sys events */
> +	val = (origin >> PM_MSI_INT_MSI_SHIFT) & 0xf;
> +	events |= val << EVENT_PM_MSI_INT_MSI;
> +
> +	return events;
> +}
> +
> +static u32 plda_hwirq_to_mask(int hwirq)
> +{
> +	u32 mask;
> +
> +	if (hwirq < EVENT_PM_MSI_INT_INTX)
> +		mask = BIT(hwirq + A_ATR_EVT_POST_ERR_SHIFT);
> +	else if (hwirq == EVENT_PM_MSI_INT_INTX)
> +		mask = PM_MSI_INT_INTX_MASK;
> +	else
> +		mask = BIT(hwirq + PM_MSI_TO_MASK_OFFSET);
> +
> +	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 int plda_pcie_event_map(struct irq_domain *domain, unsigned int irq,
> +			       irq_hw_number_t hwirq)
> +{
> +	irq_set_chip_and_handler(irq, &plda_event_irq_chip, handle_level_irq);
> +	irq_set_chip_data(irq, domain->host_data);
> +
> +	return 0;
> +}
> +
> +static const struct irq_domain_ops plda_evt_dom_ops = {
> +	.map = plda_pcie_event_map,
> +};
> +
> +static const struct plda_event_ops plda_event_ops = {
> +	.get_events = plda_get_events,
> +};
> +
>  void plda_pcie_setup_window(void __iomem *bridge_base_addr, u32 index,
>  			    phys_addr_t axi_addr, phys_addr_t pci_addr,
>  			    size_t size)
> diff --git a/drivers/pci/controller/plda/pcie-plda.h b/drivers/pci/controller/plda/pcie-plda.h
> index 3deefd35fa5a..32a913d4101f 100644
> --- a/drivers/pci/controller/plda/pcie-plda.h
> +++ b/drivers/pci/controller/plda/pcie-plda.h
> @@ -102,6 +102,38 @@
>  #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
> + */
> +
> +#define PM_MSI_TO_MASK_OFFSET			19
> +
> +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;
> @@ -120,6 +152,7 @@ struct plda_pcie_rp {
>  	void __iomem *bridge_addr;
>  };
>  
> +irqreturn_t plda_event_handler(int irq, void *dev_id);
>  void plda_pcie_setup_window(void __iomem *bridge_base_addr, u32 index,
>  			    phys_addr_t axi_addr, phys_addr_t pci_addr,
>  			    size_t size);
> -- 
> 2.17.1
> 

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