linux-kernel - Re: [PATCH 3/3] gpio: pcie-idio-24: Enable PEX8311 interrupts

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Date:   Wed, 4 Nov 2020 10:47:44 -0500
From:   William Breathitt Gray <vilhelm.gray@...il.com>
To:     Arnaud de Turckheim <quarium@...il.com>
Cc:     linus.walleij@...aro.org, bgolaszewski@...libre.com,
        linux-kernel@...r.kernel.org, linux-gpio@...r.kernel.org
Subject: Re: [PATCH 3/3] gpio: pcie-idio-24: Enable PEX8311 interrupts

On Wed, Nov 04, 2020 at 04:24:55PM +0100, Arnaud de Turckheim wrote:
> This enables the PEX8311 internal PCI wire interrupt and the PEX8311
> local interrupt input so the local interrupts are forwarded to the PCI.
> 
> Fixes: 585562046628 ("gpio: Add GPIO support for the ACCES PCIe-IDIO-24 family")
> Signed-off-by: Arnaud de Turckheim <quarium@...il.com>

Reviewed-by: William Breathitt Gray <vilhelm.gray@...il.com>

> ---
>  drivers/gpio/gpio-pcie-idio-24.c | 52 +++++++++++++++++++++++++++++++-
>  1 file changed, 51 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/gpio/gpio-pcie-idio-24.c b/drivers/gpio/gpio-pcie-idio-24.c
> index a61de14d09b6..2a07fd96707e 100644
> --- a/drivers/gpio/gpio-pcie-idio-24.c
> +++ b/drivers/gpio/gpio-pcie-idio-24.c
> @@ -28,6 +28,47 @@
>  #include <linux/spinlock.h>
>  #include <linux/types.h>
>  
> +/*
> + * PLX PEX8311 PCI LCS_INTCSR Interrupt Control/Status
> + *
> + * Bit: Description
> + *   0: Enable Interrupt Sources (Bit 0)
> + *   1: Enable Interrupt Sources (Bit 1)
> + *   2: Generate Internal PCI Bus Internal SERR# Interrupt
> + *   3: Mailbox Interrupt Enable
> + *   4: Power Management Interrupt Enable
> + *   5: Power Management Interrupt
> + *   6: Slave Read Local Data Parity Check Error Enable
> + *   7: Slave Read Local Data Parity Check Error Status
> + *   8: Internal PCI Wire Interrupt Enable
> + *   9: PCI Express Doorbell Interrupt Enable
> + *  10: PCI Abort Interrupt Enable
> + *  11: Local Interrupt Input Enable
> + *  12: Retry Abort Enable
> + *  13: PCI Express Doorbell Interrupt Active
> + *  14: PCI Abort Interrupt Active
> + *  15: Local Interrupt Input Active
> + *  16: Local Interrupt Output Enable
> + *  17: Local Doorbell Interrupt Enable
> + *  18: DMA Channel 0 Interrupt Enable
> + *  19: DMA Channel 1 Interrupt Enable
> + *  20: Local Doorbell Interrupt Active
> + *  21: DMA Channel 0 Interrupt Active
> + *  22: DMA Channel 1 Interrupt Active
> + *  23: Built-In Self-Test (BIST) Interrupt Active
> + *  24: Direct Master was the Bus Master during a Master or Target Abort
> + *  25: DMA Channel 0 was the Bus Master during a Master or Target Abort
> + *  26: DMA Channel 1 was the Bus Master during a Master or Target Abort
> + *  27: Target Abort after internal 256 consecutive Master Retrys
> + *  28: PCI Bus wrote data to LCS_MBOX0
> + *  29: PCI Bus wrote data to LCS_MBOX1
> + *  30: PCI Bus wrote data to LCS_MBOX2
> + *  31: PCI Bus wrote data to LCS_MBOX3
> + */
> +#define PLX_PEX8311_PCI_LCS_INTCSR  0x68
> +#define INTCSR_INTERNAL_PCI_WIRE    BIT(8)
> +#define INTCSR_LOCAL_INPUT          BIT(11)
> +
>  /**
>   * struct idio_24_gpio_reg - GPIO device registers structure
>   * @out0_7:	Read: FET Outputs 0-7
> @@ -92,6 +133,7 @@ struct idio_24_gpio_reg {
>  struct idio_24_gpio {
>  	struct gpio_chip chip;
>  	raw_spinlock_t lock;
> +	__u8 __iomem *plx;
>  	struct idio_24_gpio_reg __iomem *reg;
>  	unsigned long irq_mask;
>  };
> @@ -455,6 +497,7 @@ static int idio_24_probe(struct pci_dev *pdev, const struct pci_device_id *id)
>  	struct device *const dev = &pdev->dev;
>  	struct idio_24_gpio *idio24gpio;
>  	int err;
> +	const size_t pci_plx_bar_index = 1;
>  	const size_t pci_bar_index = 2;
>  	const char *const name = pci_name(pdev);
>  	struct gpio_irq_chip *girq;
> @@ -469,12 +512,13 @@ static int idio_24_probe(struct pci_dev *pdev, const struct pci_device_id *id)
>  		return err;
>  	}
>  
> -	err = pcim_iomap_regions(pdev, BIT(pci_bar_index), name);
> +	err = pcim_iomap_regions(pdev, BIT(pci_plx_bar_index) | BIT(pci_bar_index), name);
>  	if (err) {
>  		dev_err(dev, "Unable to map PCI I/O addresses (%d)\n", err);
>  		return err;
>  	}
>  
> +	idio24gpio->plx = pcim_iomap_table(pdev)[pci_plx_bar_index];
>  	idio24gpio->reg = pcim_iomap_table(pdev)[pci_bar_index];
>  
>  	idio24gpio->chip.label = name;
> @@ -504,6 +548,12 @@ static int idio_24_probe(struct pci_dev *pdev, const struct pci_device_id *id)
>  
>  	/* Software board reset */
>  	iowrite8(0, &idio24gpio->reg->soft_reset);
> +	/*
> +	 * enable PLX PEX8311 internal PCI wire interrupt and local interrupt
> +	 * input
> +	 */
> +	iowrite8((INTCSR_INTERNAL_PCI_WIRE | INTCSR_LOCAL_INPUT) >> 8,
> +		 idio24gpio->plx + PLX_PEX8311_PCI_LCS_INTCSR + 1);
>  
>  	err = devm_gpiochip_add_data(dev, &idio24gpio->chip, idio24gpio);
>  	if (err) {
> -- 
> 2.25.1
> 

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