回复: [PATCH v14 15/22] PCI: microchip: Add event irqchip field to host port and add PLDA irqchip

From: Minda Chen <minda.chen@starfivetech.com>
To: "Conor Dooley" <conor@kernel.org>,
	"Krzysztof Wilczy��ski" <kw@linux.com>,
	"Rob Herring" <robh+dt@kernel.org>,
	"Bjorn Helgaas" <bhelgaas@google.com>,
	"Lorenzo Pieralisi" <lpieralisi@kernel.org>,
	"Daire McNamara" <daire.mcnamara@microchip.com>,
	"Emil Renner Berthing" <emil.renner.berthing@canonical.com>,
	"Krzysztof Kozlowski" <krzysztof.kozlowski+dt@linaro.org>,
	"tglx@linutronix.de" <tglx@linutronix.de>
Cc: "devicetree@vger.kernel.org" <devicetree@vger.kernel.org>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	"linux-riscv@lists.infradead.org"
	<linux-riscv@lists.infradead.org>,
	"linux-pci@vger.kernel.org" <linux-pci@vger.kernel.org>,
	Paul Walmsley <paul.walmsley@sifive.com>,
	Palmer Dabbelt <palmer@dabbelt.com>,
	Albert Ou <aou@eecs.berkeley.edu>,
	Philipp Zabel <p.zabel@pengutronix.de>,
	Mason Huo <mason.huo@starfivetech.com>,
	Leyfoon Tan <leyfoon.tan@starfivetech.com>,
	Kevin Xie <kevin.xie@starfivetech.com>
Subject: 回复: [PATCH v14 15/22] PCI: microchip: Add event irqchip field to host port and add PLDA irqchip
Date: Mon, 8 Jan 2024 11:17:19 +0000	[thread overview]
Message-ID: <SHXPR01MB0863F00F7D735A9B7189948BE66BA@SHXPR01MB0863.CHNPR01.prod.partner.outlook.cn> (raw)
In-Reply-To: <20240108110612.19048-16-minda.chen@starfivetech.com>


> 主题: [PATCH v14 15/22] PCI: microchip: Add event irqchip field to host port and
> add PLDA irqchip
> 
> As PLDA dts binding doc(Documentation/devicetree/bindings/pci/
> plda,xpressrich3-axi-common.yaml) showes, PLDA PCIe contains an interrupt
> controller.
> 
> Microchip PolarFire PCIE event IRQs includes PLDA interrupts and Polarfire their
> own 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.
> 
> To support PLDA its own event IRQ process, implements PLDA irqchip ops and
> add event irqchip field to struct pcie_plda_rp.
> 
> Signed-off-by: Minda Chen <minda.chen@starfivetech.com>
> Acked-by: Conor Dooley <conor.dooley@microchip.com>
> ---
>  .../pci/controller/plda/pcie-microchip-host.c | 66 ++++++++++++++++++-
>  drivers/pci/controller/plda/pcie-plda.h       |  5 +-
>  2 files changed, 69 insertions(+), 2 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;
> +}
> +
Hi Tomas
plda_hwirq_to_mask () is event to register mapping.

register bit      event
0                  0

|                  |
|                  |
23                23
24  ---->         24 (intx)
|     |
27  ---+
28                25
|                  |
31                28

> +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 9db92ccf286c..a3ce01735bea 100644
> --- a/drivers/pci/controller/plda/pcie-plda.h
> +++ b/drivers/pci/controller/plda/pcie-plda.h
> @@ -107,7 +107,9 @@ enum plda_int_event {
> 
>  #define PLDA_NUM_DMA_EVENTS			16
> 
> -#define PLDA_MAX_INT_NUM			(PLDA_NUM_DMA_EVENTS +
> PLDA_INT_EVENT_NUM)
> +#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)
> 
>  /*
>   * PLDA interrupt register
> @@ -155,6 +157,7 @@ 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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