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Date: Wed, 7 Jun 2017 22:57:11 +0200 (CEST)
From: Stefan Wahren <stefan.wahren@...e.com>
To: Phil Elwell <phil@...pberrypi.org>
Cc: alexanders83@....de, Eric Anholt <eric@...olt.net>,
Rob Herring <robh+dt@...nel.org>,
Stephen Boyd <sboyd@...eaurora.org>,
linux-kernel@...r.kernel.org, linux-clk@...r.kernel.org,
devicetree@...r.kernel.org, Mark Rutland <mark.rutland@....com>,
linux-rpi-kernel@...ts.infradead.org,
Florian Fainelli <f.fainelli@...il.com>
Subject: Re: [PATCH 1/2] clk: bcm2835: Add AUX interrupt controller
> Phil Elwell <phil@...pberrypi.org> hat am 7. Juni 2017 um 13:11 geschrieben:
>
>
> Devices in the AUX block share a common interrupt line, with a register
> indicating which devices have active IRQs. Expose this as a nested
> interrupt controller to avoid IRQ sharing problems (easily observed if
> UART1 and SPI1/2 are enabled simultaneously).
>
> Signed-off-by: Phil Elwell <phil@...pberrypi.org>
> ---
> drivers/clk/bcm/clk-bcm2835-aux.c | 120 ++++++++++++++++++++++++++++++++++++++
> 1 file changed, 120 insertions(+)
>
> diff --git a/drivers/clk/bcm/clk-bcm2835-aux.c b/drivers/clk/bcm/clk-bcm2835-aux.c
> index bd750cf..41e0702 100644
> --- a/drivers/clk/bcm/clk-bcm2835-aux.c
> +++ b/drivers/clk/bcm/clk-bcm2835-aux.c
> @@ -17,17 +17,107 @@
> #include <linux/clk/bcm2835.h>
> #include <linux/module.h>
> #include <linux/platform_device.h>
> +#include <linux/interrupt.h>
> +#include <linux/irqdomain.h>
> +#include <linux/of_irq.h>
Please try to keep alphabetical order.
> #include <dt-bindings/clock/bcm2835-aux.h>
>
> #define BCM2835_AUXIRQ 0x00
> #define BCM2835_AUXENB 0x04
>
> +#define BCM2835_AUXIRQ_NUM_IRQS 3
> +
> +#define BCM2835_AUXIRQ_UART_IRQ 0
> +#define BCM2835_AUXIRQ_SPI1_IRQ 1
> +#define BCM2835_AUXIRQ_SPI2_IRQ 2
> +
> +#define BCM2835_AUXIRQ_UART_MASK 0x01
> +#define BCM2835_AUXIRQ_SPI1_MASK 0x02
> +#define BCM2835_AUXIRQ_SPI2_MASK 0x04
I think these are candidates for the BIT macro.
> +
> +#define BCM2835_AUXIRQ_ALL_MASK \
> + (BCM2835_AUXIRQ_UART_MASK | \
> + BCM2835_AUXIRQ_SPI1_MASK | \
> + BCM2835_AUXIRQ_SPI2_MASK)
> +
> +struct auxirq_state {
> + void __iomem *status;
> + u32 enables;
> + struct irq_domain *domain;
> + struct regmap *local_regmap;
This member isn't used, can it be dropped?
> +};
> +
> +static struct auxirq_state auxirq __read_mostly;
> +
> +static irqreturn_t bcm2835_auxirq_handler(int irq, void *dev_id)
> +{
> + u32 stat = readl_relaxed(auxirq.status);
> + u32 masked = stat & auxirq.enables;
> +
> + if (masked & BCM2835_AUXIRQ_UART_MASK)
> + generic_handle_irq(irq_linear_revmap(auxirq.domain,
> + BCM2835_AUXIRQ_UART_IRQ));
> +
> + if (masked & BCM2835_AUXIRQ_SPI1_MASK)
> + generic_handle_irq(irq_linear_revmap(auxirq.domain,
> + BCM2835_AUXIRQ_SPI1_IRQ));
> +
> + if (masked & BCM2835_AUXIRQ_SPI2_MASK)
> + generic_handle_irq(irq_linear_revmap(auxirq.domain,
> + BCM2835_AUXIRQ_SPI2_IRQ));
> +
> + return (masked & BCM2835_AUXIRQ_ALL_MASK) ? IRQ_HANDLED : IRQ_NONE;
> +}
> +
> +static int bcm2835_auxirq_xlate(struct irq_domain *d,
> + struct device_node *ctrlr,
> + const u32 *intspec, unsigned int intsize,
> + unsigned long *out_hwirq,
> + unsigned int *out_type)
> +{
> + if (WARN_ON(intsize != 1))
> + return -EINVAL;
> +
> + if (WARN_ON(intspec[0] >= BCM2835_AUXIRQ_NUM_IRQS))
> + return -EINVAL;
> +
> + *out_hwirq = intspec[0];
> + *out_type = IRQ_TYPE_NONE;
> + return 0;
> +}
> +
> +static void bcm2835_auxirq_mask(struct irq_data *data)
> +{
> + irq_hw_number_t hwirq = irqd_to_hwirq(data);
> +
> + auxirq.enables &= ~(1 << hwirq);
> +}
> +
> +static void bcm2835_auxirq_unmask(struct irq_data *data)
> +{
> + irq_hw_number_t hwirq = irqd_to_hwirq(data);
> +
> + auxirq.enables |= (1 << hwirq);
> +}
> +
> +static struct irq_chip bcm2835_auxirq_chip = {
> + .name = "bcm2835-auxirq",
> + .irq_mask = bcm2835_auxirq_mask,
> + .irq_unmask = bcm2835_auxirq_unmask,
> +};
> +
> +static const struct irq_domain_ops bcm2835_auxirq_ops = {
> + .xlate = bcm2835_auxirq_xlate//irq_domain_xlate_onecell
The C++ comment looks like an artifact
> +};
> +
> static int bcm2835_aux_clk_probe(struct platform_device *pdev)
> {
> struct device *dev = &pdev->dev;
> + struct device_node *node = dev->of_node;
> struct clk_hw_onecell_data *onecell;
> const char *parent;
> struct clk *parent_clk;
> + int parent_irq;
> struct resource *res;
> void __iomem *reg, *gate;
>
> @@ -41,6 +131,36 @@ static int bcm2835_aux_clk_probe(struct platform_device *pdev)
> if (IS_ERR(reg))
> return PTR_ERR(reg);
>
> + parent_irq = irq_of_parse_and_map(node, 0);
> + if (parent_irq) {
> + int ret;
> + int i;
> +
> + /* Manage the AUX irq as well */
> + auxirq.status = reg + BCM2835_AUXIRQ;
> + auxirq.domain = irq_domain_add_linear(node,
> + BCM2835_AUXIRQ_NUM_IRQS,
> + &bcm2835_auxirq_ops,
> + NULL);
> + if (!auxirq.domain)
> + return -ENXIO;
> +
> + for (i = 0; i < BCM2835_AUXIRQ_NUM_IRQS; i++) {
> + unsigned int irq = irq_create_mapping(auxirq.domain, i);
> +
> + if (irq == 0)
> + return -ENXIO;
> +
> + irq_set_chip_and_handler(irq, &bcm2835_auxirq_chip,
> + handle_level_irq);
> + }
> +
> + ret = devm_request_irq(dev, parent_irq, bcm2835_auxirq_handler,
> + 0, "bcm2835-auxirq", NULL);
> + if (ret)
> + return ret;
> + }
> +
> onecell = devm_kmalloc(dev, sizeof(*onecell) + sizeof(*onecell->hws) *
> BCM2835_AUX_CLOCK_COUNT, GFP_KERNEL);
> if (!onecell)
> --
> 1.9.1
>
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