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Message-ID: <20150107172034.GN24989@titan.lakedaemon.net>
Date: Wed, 7 Jan 2015 12:20:34 -0500
From: Jason Cooper <jason@...edaemon.net>
To: Magnus Damm <magnus.damm@...il.com>
Cc: linux-kernel@...r.kernel.org, linux-sh@...r.kernel.org,
horms@...ge.net.au, tglx@...utronix.de
Subject: Re: [PATCH] irqchip: renesas-intc-irqpin: r8a7779 IRLM setup
support
On Mon, Dec 15, 2014 at 02:09:20PM +0900, Magnus Damm wrote:
> From: Magnus Damm <damm+renesas@...nsource.se>
>
> Add r8a7779 specific support for IRLM bit configuration
> in the INTC-IRQPIN driver. Without this code we need
> special workaround code in arch/arm/mach-shmobile.
>
> The IRLM bit for the INTC hardware exists on various
> older SH-based SoCs and is used to select between two
> modes for the external interrupt pins IRQ0 to IRQ3:
>
> IRLM = 0: (default from reset on r8a7779)
> In this mode the pins IRQ0 to IRQ3 are used together
> to give a value between 0 and 15 to the SoC. External
> logic is required for masking. This mode is not
> supported by the INTC-IRQPIN driver.
>
> IRLM = 1: (needs this patch or configuration elsewhere)
> In this mode IRQ0 to IRQ3 operate as 4 individual
> external interrupt pins. In this mode the SMSC ethernet
> chip can be used via IRQ1 on r8a7779 Marzen. This mode
> is the only supported mode by the INTC-IRQPIN driver.
>
> For this patch to work the r8a7779 DTS needs to pass
> the ICR0 register as the last register bank.
>
> Signed-off-by: Magnus Damm <damm+renesas@...nsource.se>
> ---
>
> Same version as sent on December 3rd.
>
> Written against renesas-devel-20141202-v3.18-rc7 which is
> basically v3.18-rc7 plus latest arch/arm/mach-shmobile code.
>
> Documentation/devicetree/bindings/interrupt-controller/renesas,intc-irqpin.txt | 5 +
> drivers/irqchip/irq-renesas-intc-irqpin.c | 50 ++++++++--
> 2 files changed, 46 insertions(+), 9 deletions(-)
>
> --- 0001/Documentation/devicetree/bindings/interrupt-controller/renesas,intc-irqpin.txt
> +++ work/Documentation/devicetree/bindings/interrupt-controller/renesas,intc-irqpin.txt 2014-12-03 20:25:13.000000000 +0900
> @@ -9,6 +9,11 @@ Required properties:
> - "renesas,intc-irqpin-r8a7778" (R-Car M1A)
> - "renesas,intc-irqpin-r8a7779" (R-Car H1)
> - "renesas,intc-irqpin-sh73a0" (SH-Mobile AG5)
> +
> +- reg: Base address and length of each register bank used by the external
> + IRQ pins driven by the interrupt controller hardware module. The base
> + addresses, length and number of required register banks varies with soctype.
> +
> - #interrupt-cells: has to be <2>: an interrupt index and flags, as defined in
> interrupts.txt in this directory
>
> --- 0001/drivers/irqchip/irq-renesas-intc-irqpin.c
> +++ work/drivers/irqchip/irq-renesas-intc-irqpin.c 2014-12-03 20:32:59.000000000 +0900
> @@ -30,6 +30,7 @@
> #include <linux/err.h>
> #include <linux/slab.h>
> #include <linux/module.h>
> +#include <linux/of_device.h>
> #include <linux/platform_data/irq-renesas-intc-irqpin.h>
> #include <linux/pm_runtime.h>
>
> @@ -40,7 +41,9 @@
> #define INTC_IRQPIN_REG_SOURCE 2 /* INTREQnn */
> #define INTC_IRQPIN_REG_MASK 3 /* INTMSKnn */
> #define INTC_IRQPIN_REG_CLEAR 4 /* INTMSKCLRnn */
> -#define INTC_IRQPIN_REG_NR 5
> +#define INTC_IRQPIN_REG_NR_MANDATORY 5
> +#define INTC_IRQPIN_REG_IRLM 5 /* ICR0 with IRLM bit (optional) */
> +#define INTC_IRQPIN_REG_NR 6
>
> /* INTC external IRQ PIN hardware register access:
> *
> @@ -82,6 +85,10 @@ struct intc_irqpin_priv {
> u8 shared_irq_mask;
> };
>
> +struct intc_irqpin_irlm_config {
> + unsigned int irlm_bit;
> +};
> +
> static unsigned long intc_irqpin_read32(void __iomem *iomem)
> {
> return ioread32(iomem);
> @@ -345,10 +352,23 @@ static struct irq_domain_ops intc_irqpin
> .xlate = irq_domain_xlate_twocell,
> };
>
> +static const struct intc_irqpin_irlm_config intc_irqpin_irlm_r8a7779 = {
> + .irlm_bit = 23, /* ICR0.IRLM0 */
> +};
> +
> +static const struct of_device_id intc_irqpin_dt_ids[] = {
> + { .compatible = "renesas,intc-irqpin", },
> + { .compatible = "renesas,intc-irqpin-r8a7779",
> + .data = &intc_irqpin_irlm_r8a7779 },
> + {},
> +};
> +MODULE_DEVICE_TABLE(of, intc_irqpin_dt_ids);
> +
> static int intc_irqpin_probe(struct platform_device *pdev)
> {
> struct device *dev = &pdev->dev;
> struct renesas_intc_irqpin_config *pdata = dev->platform_data;
> + const struct of_device_id *of_id;
> struct intc_irqpin_priv *p;
> struct intc_irqpin_iomem *i;
> struct resource *io[INTC_IRQPIN_REG_NR];
> @@ -391,10 +411,11 @@ static int intc_irqpin_probe(struct plat
> pm_runtime_enable(dev);
> pm_runtime_get_sync(dev);
>
> - /* get hold of manadatory IOMEM */
> + /* get hold of register banks */
> + memset(io, 0, sizeof(io));
> for (k = 0; k < INTC_IRQPIN_REG_NR; k++) {
> io[k] = platform_get_resource(pdev, IORESOURCE_MEM, k);
> - if (!io[k]) {
> + if (!io[k] && k < INTC_IRQPIN_REG_NR_MANDATORY) {
> dev_err(dev, "not enough IOMEM resources\n");
> ret = -EINVAL;
> goto err0;
> @@ -422,6 +443,10 @@ static int intc_irqpin_probe(struct plat
> for (k = 0; k < INTC_IRQPIN_REG_NR; k++) {
> i = &p->iomem[k];
>
> + /* handle optional registers */
> + if (!io[k])
> + continue;
> +
> switch (resource_size(io[k])) {
> case 1:
> i->width = 8;
> @@ -448,6 +473,19 @@ static int intc_irqpin_probe(struct plat
> }
> }
>
> + /* configure "individual IRQ mode" where needed */
> + of_id = of_match_device(intc_irqpin_dt_ids, dev);
> + if (of_id && of_id->data) {
> + const struct intc_irqpin_irlm_config *irlm_config = of_id->data;
> +
> + if (io[INTC_IRQPIN_REG_IRLM])
> + intc_irqpin_read_modify_write(p, INTC_IRQPIN_REG_IRLM,
> + irlm_config->irlm_bit,
> + 1, 1);
> + else
> + dev_warn(dev, "unable to select IRLM mode\n");
What was the default behavior of the arch code before the DT binding
change? Should that action be performed here?
thx,
Jason.
> + }
> +
> /* mask all interrupts using priority */
> for (k = 0; k < p->number_of_irqs; k++)
> intc_irqpin_mask_unmask_prio(p, k, 1);
> @@ -550,12 +588,6 @@ static int intc_irqpin_remove(struct pla
> return 0;
> }
>
> -static const struct of_device_id intc_irqpin_dt_ids[] = {
> - { .compatible = "renesas,intc-irqpin", },
> - {},
> -};
> -MODULE_DEVICE_TABLE(of, intc_irqpin_dt_ids);
> -
> static struct platform_driver intc_irqpin_device_driver = {
> .probe = intc_irqpin_probe,
> .remove = intc_irqpin_remove,
--
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