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pinctrl: single: Add support for wake-up interrupts

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The pin control registers can have interrupts for example
for device wake-up. These interrupts can be treated as a
chained interrupt controller as suggested earlier by
Linus Walleij <linus.walleij@linaro.org>.

This patch adds support for interrupts in a way that
should be pretty generic, and works for the omaps that
support wake-up interrupts. On omaps, there's an
interrupt enable and interrupt status bit for each pin.
The two pinctrl domains on omaps share a single interrupt
from the PRM chained interrupt handler. Support for
other similar hardware should be easy to add.

Note that this patch does not attempt to handle the
wake-up interrupts automatically unlike the earlier
patches. This patch allows the device drivers to do
a request_irq() on the wake-up pins as needed. I'll
try to do also a separate generic patch for handling
the wake-up events automatically.

Also note that as this patch makes the pinctrl-single
an irq controller, the current bindings need some
extra trickery to use interrupts from two different
interrupt controllers for the same driver. So it
might be worth waiting a little on the patches
enabling the wake-up interrupts from drivers as there
should be a generic way to handle it coming. And also
there's been discussion of interrupts-extended binding
for using interrupts from multiple interrupt controllers.

In any case, this patch should be ready to go allowing
handling the wake-up interrupts in a generic way, or
separately from the device drivers.

Cc: Peter Ujfalusi <peter.ujfalusi@ti.com>
Cc: Grygorii Strashko <grygorii.strashko@ti.com>
Cc: Prakash Manjunathappa <prakash.pm@ti.com>
Cc: Roger Quadros <rogerq@ti.com>
Cc: linux-kernel@vger.kernel.org
Cc: Benoît Cousson <bcousson@baylibre.com>
Cc: devicetree@vger.kernel.org
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Acked-by: Haojian Zhuang <haojian.zhuang@gmail.com>
Reviewed-by: Kevin Hilman <khilman@linaro.org>
Tested-by: Kevin Hilman <khilman@linaro.org>
Signed-off-by: Tony Lindgren <tony@atomide.com>
This commit is contained in:
Tony Lindgren 2013-10-02 21:39:40 -07:00
parent 02e483f66d
commit 3e6cee1786
2 changed files with 333 additions and 0 deletions
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11
Documentation/devicetree/bindings/pinctrl/pinctrl-single.txt
View File

@ -72,6 +72,13 @@ Optional properties:
/* pin base, nr pins & gpio function */
pinctrl-single,gpio-range = <&range 0 3 0 &range 3 9 1>;
- interrupt-controller : standard interrupt controller binding if using
interrupts for wake-up events for example. In this case pinctrl-single
is set up as a chained interrupt controller and the wake-up interrupts
can be requested by the drivers using request_irq().
- #interrupt-cells : standard interrupt binding if using interrupts
This driver assumes that there is only one register for each pin (unless the
pinctrl-single,bit-per-mux is set), and uses the common pinctrl bindings as
specified in the pinctrl-bindings.txt document in this directory.
@ -121,6 +128,8 @@ pmx_core: pinmux@4a100040 {
reg = <0x4a100040 0x0196>;
#address-cells = <1>;
#size-cells = <0>;
#interrupt-cells = <1>;
interrupt-controller;
pinctrl-single,register-width = <16>;
pinctrl-single,function-mask = <0xffff>;
};
@ -131,6 +140,8 @@ pmx_wkup: pinmux@4a31e040 {
reg = <0x4a31e040 0x0038>;
#address-cells = <1>;
#size-cells = <0>;
#interrupt-cells = <1>;
interrupt-controller;
pinctrl-single,register-width = <16>;
pinctrl-single,function-mask = <0xffff>;
};

322
drivers/pinctrl/pinctrl-single.c
View File

@ -15,10 +15,14 @@
#include <linux/slab.h>
#include <linux/err.h>
#include <linux/list.h>
#include <linux/interrupt.h>
#include <linux/irqchip/chained_irq.h>
#include <linux/of.h>
#include <linux/of_device.h>
#include <linux/of_address.h>
#include <linux/of_irq.h>
#include <linux/pinctrl/pinctrl.h>
#include <linux/pinctrl/pinmux.h>
@ -152,9 +156,15 @@ struct pcs_name {
/**
* struct pcs_soc_data - SoC specific settings
* @flags: initial SoC specific PCS_FEAT_xxx values
* @irq: optional interrupt for the controller
* @irq_enable_mask: optional SoC specific interrupt enable mask
* @irq_status_mask: optional SoC specific interrupt status mask
*/
struct pcs_soc_data {
unsigned flags;
int irq;
unsigned irq_enable_mask;
unsigned irq_status_mask;
};
/**
@ -165,6 +175,7 @@ struct pcs_soc_data {
* @dev: device entry
* @pctl: pin controller device
* @flags: mask of PCS_FEAT_xxx values
* @lock: spinlock for register access
* @mutex: mutex protecting the lists
* @width: bits per mux register
* @fmask: function register mask
@ -179,6 +190,9 @@ struct pcs_soc_data {
* @pingroups: list of pingroups
* @functions: list of functions
* @gpiofuncs: list of gpio functions
* @irqs: list of interrupt registers
* @chip: chip container for this instance
* @domain: IRQ domain for this instance
* @ngroups: number of pingroups
* @nfuncs: number of functions
* @desc: pin controller descriptor
@ -192,7 +206,11 @@ struct pcs_device {
struct device *dev;
struct pinctrl_dev *pctl;
unsigned flags;
#define PCS_QUIRK_SHARED_IRQ (1 << 2)
#define PCS_FEAT_IRQ (1 << 1)
#define PCS_FEAT_PINCONF (1 << 0)
struct pcs_soc_data socdata;
raw_spinlock_t lock;
struct mutex mutex;
unsigned width;
unsigned fmask;
@ -208,6 +226,9 @@ struct pcs_device {
struct list_head pingroups;
struct list_head functions;
struct list_head gpiofuncs;
struct list_head irqs;
struct irq_chip chip;
struct irq_domain *domain;
unsigned ngroups;
unsigned nfuncs;
struct pinctrl_desc desc;
@ -215,6 +236,8 @@ struct pcs_device {
void (*write)(unsigned val, void __iomem *reg);
};
#define PCS_QUIRK_HAS_SHARED_IRQ (pcs->flags & PCS_QUIRK_SHARED_IRQ)
#define PCS_HAS_IRQ (pcs->flags & PCS_FEAT_IRQ)
#define PCS_HAS_PINCONF (pcs->flags & PCS_FEAT_PINCONF)
static int pcs_pinconf_get(struct pinctrl_dev *pctldev, unsigned pin,
@ -440,9 +463,11 @@ static int pcs_enable(struct pinctrl_dev *pctldev, unsigned fselector,
for (i = 0; i < func->nvals; i++) {
struct pcs_func_vals *vals;
unsigned long flags;
unsigned val, mask;
vals = &func->vals[i];
raw_spin_lock_irqsave(&pcs->lock, flags);
val = pcs->read(vals->reg);
if (pcs->bits_per_mux)
@ -453,6 +478,7 @@ static int pcs_enable(struct pinctrl_dev *pctldev, unsigned fselector,
val &= ~mask;
val |= (vals->val & mask);
pcs->write(val, vals->reg);
raw_spin_unlock_irqrestore(&pcs->lock, flags);
}
return 0;
@ -494,13 +520,16 @@ static void pcs_disable(struct pinctrl_dev *pctldev, unsigned fselector,
for (i = 0; i < func->nvals; i++) {
struct pcs_func_vals *vals;
unsigned long flags;
unsigned val;
vals = &func->vals[i];
raw_spin_lock_irqsave(&pcs->lock, flags);
val = pcs->read(vals->reg);
val &= ~pcs->fmask;
val |= pcs->foff << pcs->fshift;
pcs->write(val, vals->reg);
raw_spin_unlock_irqrestore(&pcs->lock, flags);
}
}
@ -1450,12 +1479,34 @@ static void pcs_free_pingroups(struct pcs_device *pcs)
mutex_unlock(&pcs->mutex);
}
/**
* pcs_irq_free() - free interrupt
* @pcs: pcs driver instance
*/
static void pcs_irq_free(struct pcs_device *pcs)
{
struct pcs_soc_data *pcs_soc = &pcs->socdata;
if (pcs_soc->irq < 0)
return;
if (pcs->domain)
irq_domain_remove(pcs->domain);
if (PCS_QUIRK_HAS_SHARED_IRQ)
free_irq(pcs_soc->irq, pcs_soc);
else
irq_set_chained_handler(pcs_soc->irq, NULL);
}
/**
* pcs_free_resources() - free memory used by this driver
* @pcs: pcs driver instance
*/
static void pcs_free_resources(struct pcs_device *pcs)
{
pcs_irq_free(pcs);
if (pcs->pctl)
pinctrl_unregister(pcs->pctl);
@ -1504,6 +1555,256 @@ static int pcs_add_gpio_func(struct device_node *node, struct pcs_device *pcs)
}
return ret;
}
/**
* @reg: virtual address of interrupt register
* @hwirq: hardware irq number
* @irq: virtual irq number
* @node: list node
*/
struct pcs_interrupt {
void __iomem *reg;
irq_hw_number_t hwirq;
unsigned int irq;
struct list_head node;
};
/**
* pcs_irq_set() - enables or disables an interrupt
*
* Note that this currently assumes one interrupt per pinctrl
* register that is typically used for wake-up events.
*/
static inline void pcs_irq_set(struct pcs_soc_data *pcs_soc,
int irq, const bool enable)
{
struct pcs_device *pcs;
struct list_head *pos;
unsigned mask;
pcs = container_of(pcs_soc, struct pcs_device, socdata);
list_for_each(pos, &pcs->irqs) {
struct pcs_interrupt *pcswi;
unsigned soc_mask;
pcswi = list_entry(pos, struct pcs_interrupt, node);
if (irq != pcswi->irq)
continue;
soc_mask = pcs_soc->irq_enable_mask;
raw_spin_lock(&pcs->lock);
mask = pcs->read(pcswi->reg);
if (enable)
mask |= soc_mask;
else
mask &= ~soc_mask;
pcs->write(mask, pcswi->reg);
raw_spin_unlock(&pcs->lock);
}
}
/**
* pcs_irq_mask() - mask pinctrl interrupt
* @d: interrupt data
*/
static void pcs_irq_mask(struct irq_data *d)
{
struct pcs_soc_data *pcs_soc = irq_data_get_irq_chip_data(d);
pcs_irq_set(pcs_soc, d->irq, false);
}
/**
* pcs_irq_unmask() - unmask pinctrl interrupt
* @d: interrupt data
*/
static void pcs_irq_unmask(struct irq_data *d)
{
struct pcs_soc_data *pcs_soc = irq_data_get_irq_chip_data(d);
pcs_irq_set(pcs_soc, d->irq, true);
}
/**
* pcs_irq_set_wake() - toggle the suspend and resume wake up
* @d: interrupt data
* @state: wake-up state
*
* Note that this should be called only for suspend and resume.
* For runtime PM, the wake-up events should be enabled by default.
*/
static int pcs_irq_set_wake(struct irq_data *d, unsigned int state)
{
if (state)
pcs_irq_unmask(d);
else
pcs_irq_mask(d);
return 0;
}
/**
* pcs_irq_handle() - common interrupt handler
* @pcs_irq: interrupt data
*
* Note that this currently assumes we have one interrupt bit per
* mux register. This interrupt is typically used for wake-up events.
* For more complex interrupts different handlers can be specified.
*/
static int pcs_irq_handle(struct pcs_soc_data *pcs_soc)
{
struct pcs_device *pcs;
struct list_head *pos;
int count = 0;
pcs = container_of(pcs_soc, struct pcs_device, socdata);
list_for_each(pos, &pcs->irqs) {
struct pcs_interrupt *pcswi;
unsigned mask;
pcswi = list_entry(pos, struct pcs_interrupt, node);
raw_spin_lock(&pcs->lock);
mask = pcs->read(pcswi->reg);
raw_spin_unlock(&pcs->lock);
if (mask & pcs_soc->irq_status_mask) {
generic_handle_irq(irq_find_mapping(pcs->domain,
pcswi->hwirq));
count++;
}
}
return count;
}
/**
* pcs_irq_handler() - handler for the shared interrupt case
* @irq: interrupt
* @d: data
*
* Use this for cases where multiple instances of
* pinctrl-single share a single interrupt like on omaps.
*/
static irqreturn_t pcs_irq_handler(int irq, void *d)
{
struct pcs_soc_data *pcs_soc = d;
return pcs_irq_handle(pcs_soc) ? IRQ_HANDLED : IRQ_NONE;
}
/**
* pcs_irq_handle() - handler for the dedicated chained interrupt case
* @irq: interrupt
* @desc: interrupt descriptor
*
* Use this if you have a separate interrupt for each
* pinctrl-single instance.
*/
static void pcs_irq_chain_handler(unsigned int irq, struct irq_desc *desc)
{
struct pcs_soc_data *pcs_soc = irq_desc_get_handler_data(desc);
struct irq_chip *chip;
int res;
chip = irq_get_chip(irq);
chained_irq_enter(chip, desc);
res = pcs_irq_handle(pcs_soc);
/* REVISIT: export and add handle_bad_irq(irq, desc)? */
chained_irq_exit(chip, desc);
return;
}
static int pcs_irqdomain_map(struct irq_domain *d, unsigned int irq,
irq_hw_number_t hwirq)
{
struct pcs_soc_data *pcs_soc = d->host_data;
struct pcs_device *pcs;
struct pcs_interrupt *pcswi;
pcs = container_of(pcs_soc, struct pcs_device, socdata);
pcswi = devm_kzalloc(pcs->dev, sizeof(*pcswi), GFP_KERNEL);
if (!pcswi)
return -ENOMEM;
pcswi->reg = pcs->base + hwirq;
pcswi->hwirq = hwirq;
pcswi->irq = irq;
mutex_lock(&pcs->mutex);
list_add_tail(&pcswi->node, &pcs->irqs);
mutex_unlock(&pcs->mutex);
irq_set_chip_data(irq, pcs_soc);
irq_set_chip_and_handler(irq, &pcs->chip,
handle_level_irq);
set_irq_flags(irq, IRQF_VALID | IRQF_PROBE);
return 0;
}
static struct irq_domain_ops pcs_irqdomain_ops = {
.map = pcs_irqdomain_map,
.xlate = irq_domain_xlate_onecell,
};
/**
* pcs_irq_init_chained_handler() - set up a chained interrupt handler
* @pcs: pcs driver instance
* @np: device node pointer
*/
static int pcs_irq_init_chained_handler(struct pcs_device *pcs,
struct device_node *np)
{
struct pcs_soc_data *pcs_soc = &pcs->socdata;
const char *name = "pinctrl";
int num_irqs;
if (!pcs_soc->irq_enable_mask ||
!pcs_soc->irq_status_mask) {
pcs_soc->irq = -1;
return -EINVAL;
}
INIT_LIST_HEAD(&pcs->irqs);
pcs->chip.name = name;
pcs->chip.irq_ack = pcs_irq_mask;
pcs->chip.irq_mask = pcs_irq_mask;
pcs->chip.irq_unmask = pcs_irq_unmask;
pcs->chip.irq_set_wake = pcs_irq_set_wake;
if (PCS_QUIRK_HAS_SHARED_IRQ) {
int res;
res = request_irq(pcs_soc->irq, pcs_irq_handler,
IRQF_SHARED | IRQF_NO_SUSPEND,
name, pcs_soc);
if (res) {
pcs_soc->irq = -1;
return res;
}
} else {
irq_set_handler_data(pcs_soc->irq, pcs_soc);
irq_set_chained_handler(pcs_soc->irq,
pcs_irq_chain_handler);
}
/*
* We can use the register offset as the hardirq
* number as irq_domain_add_simple maps them lazily.
* This way we can easily support more than one
* interrupt per function if needed.
*/
num_irqs = pcs->size;
pcs->domain = irq_domain_add_simple(np, num_irqs, 0,
&pcs_irqdomain_ops,
pcs_soc);
if (!pcs->domain) {
irq_set_chained_handler(pcs_soc->irq, NULL);
return -EINVAL;
}
return 0;
}
#ifdef CONFIG_PM
static int pinctrl_single_suspend(struct platform_device *pdev,
@ -1549,12 +1850,14 @@ static int pcs_probe(struct platform_device *pdev)
return -ENOMEM;
}
pcs->dev = &pdev->dev;
raw_spin_lock_init(&pcs->lock);
mutex_init(&pcs->mutex);
INIT_LIST_HEAD(&pcs->pingroups);
INIT_LIST_HEAD(&pcs->functions);
INIT_LIST_HEAD(&pcs->gpiofuncs);
soc = match->data;
pcs->flags = soc->flags;
memcpy(&pcs->socdata, soc, sizeof(*soc));
PCS_GET_PROP_U32("pinctrl-single,register-width", &pcs->width,
"register width not specified\n");
@ -1642,6 +1945,16 @@ static int pcs_probe(struct platform_device *pdev)
if (ret < 0)
goto free;
pcs->socdata.irq = irq_of_parse_and_map(np, 0);
if (pcs->socdata.irq)
pcs->flags |= PCS_FEAT_IRQ;
if (PCS_HAS_IRQ) {
ret = pcs_irq_init_chained_handler(pcs, np);
if (ret < 0)
dev_warn(pcs->dev, "initialized with no interrupts\n");
}
dev_info(pcs->dev, "%i pins at pa %p size %u\n",
pcs->desc.npins, pcs->base, pcs->size);
@ -1665,6 +1978,12 @@ static int pcs_remove(struct platform_device *pdev)
return 0;
}
static const struct pcs_soc_data pinctrl_single_omap_wkup = {
.flags = PCS_QUIRK_SHARED_IRQ,
.irq_enable_mask = (1 << 14), /* OMAP_WAKEUP_EN */
.irq_status_mask = (1 << 15), /* OMAP_WAKEUP_EVENT */
};
static const struct pcs_soc_data pinctrl_single = {
};
@ -1673,6 +1992,9 @@ static const struct pcs_soc_data pinconf_single = {
};
static struct of_device_id pcs_of_match[] = {
{ .compatible = "ti,omap3-padconf", .data = &pinctrl_single_omap_wkup },
{ .compatible = "ti,omap4-padconf", .data = &pinctrl_single_omap_wkup },
{ .compatible = "ti,omap5-padconf", .data = &pinctrl_single_omap_wkup },
{ .compatible = "pinctrl-single", .data = &pinctrl_single },
{ .compatible = "pinconf-single", .data = &pinconf_single },
{ },