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Date: Thu, 02 Sep 2010 11:57:10 +0300
From: Mike Rapoport <mike@...pulab.co.il>
To: Gary King <gking@...dia.com>
CC: linux-kernel@...r.kernel.org, sameo@...ux.intel.com,
Mike Rapoport <mike@...pulab.co.il>
Subject: Re: [PATCH] mfd: tps6586x: add basic interrupt support
Gary King wrote:
> This patch adds interrupt framework support to the tps6586x driver.
>
> --
> From 9820b7412a2f209c3249da16a000ef2555978213 Mon Sep 17 00:00:00 2001
> From: Gary King <gking@...dia.com>
> Date: Mon, 30 Aug 2010 16:16:55 -0700
> Subject: [PATCH] mfd: tps6586x: add basic interrupt support
>
> add support for enabling and disabling tps6586x subdevice interrupts,
> and add support for the RTC interrupts
>
> Signed-off-by: Gary King <gking@...dia.com>
> ---
> drivers/mfd/tps6586x.c | 184 ++++++++++++++++++++++++++++++++++++++++++
> include/linux/mfd/tps6586x.h | 7 ++
> 2 files changed, 191 insertions(+), 0 deletions(-)
>
> diff --git a/drivers/mfd/tps6586x.c b/drivers/mfd/tps6586x.c
> index 4cde31e..b98f41b 100644
> --- a/drivers/mfd/tps6586x.c
> +++ b/drivers/mfd/tps6586x.c
> @@ -15,6 +15,8 @@
> * published by the Free Software Foundation.
> */
>
> +#include <linux/interrupt.h>
> +#include <linux/irq.h>
> #include <linux/kernel.h>
> #include <linux/module.h>
> #include <linux/mutex.h>
> @@ -29,16 +31,58 @@
> #define TPS6586X_GPIOSET1 0x5d
> #define TPS6586X_GPIOSET2 0x5e
>
> +/* interrupt control registers */
> +#define TPS6586X_INT_ACK1 0xb5
> +#define TPS6586X_INT_ACK2 0xb6
> +#define TPS6586X_INT_ACK3 0xb7
> +#define TPS6586X_INT_ACK4 0xb8
> +
> +/* interrupt mask registers */
> +#define TPS6586X_INT_MASK1 0xb0
> +#define TPS6586X_INT_MASK2 0xb1
> +#define TPS6586X_INT_MASK3 0xb2
> +#define TPS6586X_INT_MASK4 0xb3
> +#define TPS6586X_INT_MASK5 0xb4
> +
> /* device id */
> #define TPS6586X_VERSIONCRC 0xcd
> #define TPS658621A_VERSIONCRC 0x15
>
> +struct tps6586x_irq_data {
> + u8 ack_reg;
> + u8 ack_mask;
If you treat the INT_ACK registers like single 32-bit int, you can enumerate the
interrupts using their indexes into the 32-bit mask, i.e
enum {
TPS6586X_INT_PLDO0 = (1 << 0),
TPS6586X_INT_PLDO1 = (1 << 1),
...
TPS6586X_INT_RTC_ALM1 = (1 << 16),
TPS6586X_INT_RTC_ALM2 = (1 << 27),
...
}
and then get rig of ack_reg and ack_mask bits and simplify the ISR (see comments
below).
> + u8 mask_reg;
> + u8 mask_mask;
> +};
> +
> +static const struct tps6586x_irq_data tps6586x_irqs[] = {
> + [TPS6586X_INT_RTC_ALM1] = {
> + .ack_reg = TPS6586X_INT_ACK3 - TPS6586X_INT_ACK1,
> + .ack_mask = (1 << 0),
> + .mask_reg = TPS6586X_INT_MASK5 - TPS6586X_INT_MASK1,
> + .mask_mask = (1 << 4),
> + },
> + [TPS6586X_INT_RTC_ALM2] = {
> + .ack_reg = TPS6586X_INT_ACK4 - TPS6586X_INT_ACK1,
> + .ack_mask = (1 << 2),
> + .mask_reg = TPS6586X_INT_MASK4 - TPS6586X_INT_MASK1,
> + .mask_mask = (1 << 1),
> + },
> +};
> +
> struct tps6586x {
> struct mutex lock;
> struct device *dev;
> struct i2c_client *client;
>
> struct gpio_chip gpio;
> + struct irq_chip irq_chip;
> + struct mutex irq_lock;
> + int irq_base;
> + int core_irq;
> + bool irq_en[ARRAY_SIZE(tps6586x_irqs)];
This as well can be u32 irq_en
> + u8 mask_cache[5];
> + u8 mask_reg[5];
> };
>
> static inline int __tps6586x_read(struct i2c_client *client,
> @@ -262,6 +306,134 @@ static int tps6586x_remove_subdevs(struct tps6586x *tps6586x)
> return device_for_each_child(tps6586x->dev, NULL, __remove_subdev);
> }
>
> +static void tps6586x_irq_lock(unsigned int irq)
> +{
> + struct tps6586x *tps6586x = get_irq_chip_data(irq);
> +
> + mutex_lock(&tps6586x->irq_lock);
> +}
> +
> +static void tps6586x_irq_enable(unsigned int irq)
> +{
> + struct tps6586x *tps6586x = get_irq_chip_data(irq);
> + unsigned int __irq = irq - tps6586x->irq_base;
> + const struct tps6586x_irq_data *data = &tps6586x_irqs[__irq];
> +
> + tps6586x->mask_reg[data->mask_reg] &= ~data->mask_mask;
> + tps6586x->irq_en[__irq] = true;
tps6586x->irq_en |= (1 << __irq);
> +}
> +
> +static void tps6586x_irq_disable(unsigned int irq)
> +{
> + struct tps6586x *tps6586x = get_irq_chip_data(irq);
> +
> + unsigned int __irq = irq - tps6586x->irq_base;
> + const struct tps6586x_irq_data *data = &tps6586x_irqs[__irq];
> +
> + tps6586x->mask_reg[data->mask_reg] |= data->mask_mask;
> + tps6586x->irq_en[__irq] = false;
tps6586x->irq_en &= (1 << __irq);
> +}
> +
> +static void tps6586x_irq_sync_unlock(unsigned int irq)
> +{
> + struct tps6586x *tps6586x = get_irq_chip_data(irq);
> + int i;
> +
> + for (i = 0; i < ARRAY_SIZE(tps6586x->mask_reg); i++) {
> + if (tps6586x->mask_reg[i] != tps6586x->mask_cache[i]) {
> + if (!WARN_ON(tps6586x_write(tps6586x->dev,
> + TPS6586X_INT_MASK1 + i,
> + tps6586x->mask_reg[i])))
> + tps6586x->mask_cache[i] = tps6586x->mask_reg[i];
> + }
> + }
> +
> + mutex_unlock(&tps6586x->irq_lock);
> +}
> +
> +static irqreturn_t tps6586x_irq(int irq, void *data)
> +{
> + struct tps6586x *tps6586x = data;
> + u8 acks[4];
> + int ret = 0, i;
> +
> + for (i = 0; i < 4 && !ret; i++) {
> + ret = tps6586x_read(tps6586x->dev, TPS6586X_INT_ACK1 + i,
> + &acks[i]);
> + }
> +
> + if (WARN_ON(ret)) {
> + disable_irq_nosync(irq);
> + return IRQ_HANDLED;
> + }
> +
> + for (i = 0; i < ARRAY_SIZE(tps6586x_irqs); i++) {
> + u8 ack;
> +
> + ack = acks[tps6586x_irqs[i].ack_reg];
> + ack &= tps6586x_irqs[i].ack_mask;
> + if (tps6586x->irq_en[i] && ack)
> + handle_nested_irq(tps6586x->irq_base + i);
> + }
> +
> + return IRQ_HANDLED;
> +}
With the interrupts enumeration proposed above the ISR could be:
static irqreturn_t tps6586x_irq(int irq, void *data)
{
struct tps6586x *tps6586x = data;
u32 acks;
int ret = 0, i;
ret = tps6586x_reads(tps6586x->dev, TPS6586X_INT_ACK1, &acks);
if (WARN_ON(ret)) {
disable_irq_nosync(irq);
return IRQ_HANDLED;
}
while (acks) {
i = __ffs(acks);
if (tps6586x->irq_en & (1 << i))
handle_nested_irq(tps6586x->irq_base + i);
acks &= ~(1 << i);
}
return IRQ_HANDLED;
}
> +static int __devinit tps6586x_irq_init(struct tps6586x *tps6586x, int irq,
> + int irq_base)
> +{
> + int i, ret;
> + u8 tmp;
> +
> + if (!irq_base) {
> + dev_warn(tps6586x->dev, "No interrupt support on IRQ base\n");
> + return -EINVAL;
> + }
> +
> + mutex_init(&tps6586x->irq_lock);
> + for (i = 0; i < 5; i++) {
> + tps6586x->mask_cache[i] = 0xff;
> + tps6586x->mask_reg[i] = 0xff;
> + tps6586x_write(tps6586x->dev, TPS6586X_INT_MASK1 + i, 0xff);
> + }
> + tps6586x_read(tps6586x->dev, TPS6586X_INT_ACK1, &tmp);
> + tps6586x_read(tps6586x->dev, TPS6586X_INT_ACK2, &tmp);
> + tps6586x_read(tps6586x->dev, TPS6586X_INT_ACK3, &tmp);
> + tps6586x_read(tps6586x->dev, TPS6586X_INT_ACK4, &tmp);
tps6586x_reads would be better here
> + tps6586x->irq_base = irq_base;
> +
> + tps6586x->irq_chip.name = "tps6586x";
> + tps6586x->irq_chip.enable = tps6586x_irq_enable;
> + tps6586x->irq_chip.disable = tps6586x_irq_disable;
> + tps6586x->irq_chip.bus_lock = tps6586x_irq_lock;
> + tps6586x->irq_chip.bus_sync_unlock = tps6586x_irq_sync_unlock;
> +
> + for (i = 0; i < ARRAY_SIZE(tps6586x_irqs); i++) {
> + int __irq = i + tps6586x->irq_base;
> + set_irq_chip_data(__irq, tps6586x);
> + set_irq_chip_and_handler(__irq, &tps6586x->irq_chip,
> + handle_simple_irq);
> + set_irq_nested_thread(__irq, 1);
> +#ifdef CONFIG_ARM
> + set_irq_flags(__irq, IRQF_VALID);
> +#endif
> + }
> +
> + tps6586x->core_irq = irq;
> + ret = request_threaded_irq(irq, NULL, tps6586x_irq, IRQF_ONESHOT,
> + "tps6586x", tps6586x);
> + if (ret) {
> + dev_err(tps6586x->dev, "Failed to request IRQ: %d\n", ret);
> + tps6586x->core_irq = -1;
> + } else {
> + device_init_wakeup(tps6586x->dev, 1);
> + enable_irq_wake(tps6586x->core_irq);
> + }
> +
> + return ret;
> +}
> +
> static int __devinit tps6586x_add_subdevs(struct tps6586x *tps6586x,
> struct tps6586x_platform_data *pdata)
> {
> @@ -315,12 +487,19 @@ static int __devinit tps6586x_i2c_probe(struct i2c_client *client,
> if (tps6586x == NULL)
> return -ENOMEM;
>
> + tps6586x->core_irq = -1;
> tps6586x->client = client;
> tps6586x->dev = &client->dev;
> i2c_set_clientdata(client, tps6586x);
>
> mutex_init(&tps6586x->lock);
>
> + if (pdata->irq) {
> + ret = tps6586x_irq_init(tps6586x, pdata->irq, pdata->irq_base);
> + if (ret)
> + dev_warn(&client->dev, "IRQ init failed: %d\n", ret);
> + }
> +
> ret = tps6586x_add_subdevs(tps6586x, pdata);
> if (ret) {
> dev_err(&client->dev, "add devices failed: %d\n", ret);
> @@ -338,6 +517,11 @@ err_add_devs:
>
> static int __devexit tps6586x_i2c_remove(struct i2c_client *client)
> {
> + struct tps6586x *tps6586x = i2c_get_clientdata(client);
> +
> + if (tps6586x->core_irq != -1)
> + free_irq(tps6586x->core_irq, tps6586x);
> +
> return 0;
> }
>
> diff --git a/include/linux/mfd/tps6586x.h b/include/linux/mfd/tps6586x.h
> index 772b3ae..e395219 100644
> --- a/include/linux/mfd/tps6586x.h
> +++ b/include/linux/mfd/tps6586x.h
> @@ -18,6 +18,11 @@ enum {
> TPS6586X_ID_LDO_RTC,
> };
>
> +enum {
> + TPS6586X_INT_RTC_ALM1,
> + TPS6586X_INT_RTC_ALM2,
> +};
> +
> struct tps6586x_subdev_info {
> int id;
> const char *name;
> @@ -29,6 +34,8 @@ struct tps6586x_platform_data {
> struct tps6586x_subdev_info *subdevs;
>
> int gpio_base;
> + int irq_base;
> + int irq;
> };
>
> /*
--
Sincerely yours,
Mike.
--
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