linux-hardened/drivers/pinctrl/pinctrl-single.c
Tony Lindgren 0ac3c0a402 pinctrl: single: Fix missing flush of posted write for a wakeirq
With many repeated suspend resume cycles, the pin specific wakeirq
may not always work on omaps. This is because the write to enable the
pin interrupt may not have reached the device over the interconnect
before suspend happens.

Let's fix the issue with a flush of posted write with a readback.

Cc: stable@vger.kernel.org
Reported-by: Nishanth Menon <nm@ti.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
2016-06-22 17:58:07 +02:00

2035 lines
49 KiB
C

/*
* Generic device tree based pinctrl driver for one register per pin
* type pinmux controllers
*
* Copyright (C) 2012 Texas Instruments, Inc.
*
* This file is licensed under the terms of the GNU General Public
* License version 2. This program is licensed "as is" without any
* warranty of any kind, whether express or implied.
*/
#include <linux/init.h>
#include <linux/module.h>
#include <linux/io.h>
#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>
#include <linux/pinctrl/pinconf-generic.h>
#include <linux/platform_data/pinctrl-single.h>
#include "core.h"
#include "pinconf.h"
#define DRIVER_NAME "pinctrl-single"
#define PCS_MUX_PINS_NAME "pinctrl-single,pins"
#define PCS_MUX_BITS_NAME "pinctrl-single,bits"
#define PCS_REG_NAME_LEN ((sizeof(unsigned long) * 2) + 3)
#define PCS_OFF_DISABLED ~0U
/**
* struct pcs_pingroup - pingroups for a function
* @np: pingroup device node pointer
* @name: pingroup name
* @gpins: array of the pins in the group
* @ngpins: number of pins in the group
* @node: list node
*/
struct pcs_pingroup {
struct device_node *np;
const char *name;
int *gpins;
int ngpins;
struct list_head node;
};
/**
* struct pcs_func_vals - mux function register offset and value pair
* @reg: register virtual address
* @val: register value
*/
struct pcs_func_vals {
void __iomem *reg;
unsigned val;
unsigned mask;
};
/**
* struct pcs_conf_vals - pinconf parameter, pinconf register offset
* and value, enable, disable, mask
* @param: config parameter
* @val: user input bits in the pinconf register
* @enable: enable bits in the pinconf register
* @disable: disable bits in the pinconf register
* @mask: mask bits in the register value
*/
struct pcs_conf_vals {
enum pin_config_param param;
unsigned val;
unsigned enable;
unsigned disable;
unsigned mask;
};
/**
* struct pcs_conf_type - pinconf property name, pinconf param pair
* @name: property name in DTS file
* @param: config parameter
*/
struct pcs_conf_type {
const char *name;
enum pin_config_param param;
};
/**
* struct pcs_function - pinctrl function
* @name: pinctrl function name
* @vals: register and vals array
* @nvals: number of entries in vals array
* @pgnames: array of pingroup names the function uses
* @npgnames: number of pingroup names the function uses
* @node: list node
*/
struct pcs_function {
const char *name;
struct pcs_func_vals *vals;
unsigned nvals;
const char **pgnames;
int npgnames;
struct pcs_conf_vals *conf;
int nconfs;
struct list_head node;
};
/**
* struct pcs_gpiofunc_range - pin ranges with same mux value of gpio function
* @offset: offset base of pins
* @npins: number pins with the same mux value of gpio function
* @gpiofunc: mux value of gpio function
* @node: list node
*/
struct pcs_gpiofunc_range {
unsigned offset;
unsigned npins;
unsigned gpiofunc;
struct list_head node;
};
/**
* struct pcs_data - wrapper for data needed by pinctrl framework
* @pa: pindesc array
* @cur: index to current element
*
* REVISIT: We should be able to drop this eventually by adding
* support for registering pins individually in the pinctrl
* framework for those drivers that don't need a static array.
*/
struct pcs_data {
struct pinctrl_pin_desc *pa;
int cur;
};
/**
* struct pcs_name - register name for a pin
* @name: name of the pinctrl register
*
* REVISIT: We may want to make names optional in the pinctrl
* framework as some drivers may not care about pin names to
* avoid kernel bloat. The pin names can be deciphered by user
* space tools using debugfs based on the register address and
* SoC packaging information.
*/
struct pcs_name {
char name[PCS_REG_NAME_LEN];
};
/**
* 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
* @rearm: optional SoC specific wake-up rearm function
*/
struct pcs_soc_data {
unsigned flags;
int irq;
unsigned irq_enable_mask;
unsigned irq_status_mask;
void (*rearm)(void);
};
/**
* struct pcs_device - pinctrl device instance
* @res: resources
* @base: virtual address of the controller
* @size: size of the ioremapped area
* @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
* @fshift: function register shift
* @foff: value to turn mux off
* @fmax: max number of functions in fmask
* @bits_per_pin:number of bits per pin
* @names: array of register names for pins
* @pins: physical pins on the SoC
* @pgtree: pingroup index radix tree
* @ftree: function index radix tree
* @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
* @read: register read function to use
* @write: register write function to use
*/
struct pcs_device {
struct resource *res;
void __iomem *base;
unsigned size;
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;
unsigned fshift;
unsigned foff;
unsigned fmax;
bool bits_per_mux;
unsigned bits_per_pin;
struct pcs_name *names;
struct pcs_data pins;
struct radix_tree_root pgtree;
struct radix_tree_root ftree;
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;
unsigned (*read)(void __iomem *reg);
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,
unsigned long *config);
static int pcs_pinconf_set(struct pinctrl_dev *pctldev, unsigned pin,
unsigned long *configs, unsigned num_configs);
static enum pin_config_param pcs_bias[] = {
PIN_CONFIG_BIAS_PULL_DOWN,
PIN_CONFIG_BIAS_PULL_UP,
};
/*
* This lock class tells lockdep that irqchip core that this single
* pinctrl can be in a different category than its parents, so it won't
* report false recursion.
*/
static struct lock_class_key pcs_lock_class;
/*
* REVISIT: Reads and writes could eventually use regmap or something
* generic. But at least on omaps, some mux registers are performance
* critical as they may need to be remuxed every time before and after
* idle. Adding tests for register access width for every read and
* write like regmap is doing is not desired, and caching the registers
* does not help in this case.
*/
static unsigned __maybe_unused pcs_readb(void __iomem *reg)
{
return readb(reg);
}
static unsigned __maybe_unused pcs_readw(void __iomem *reg)
{
return readw(reg);
}
static unsigned __maybe_unused pcs_readl(void __iomem *reg)
{
return readl(reg);
}
static void __maybe_unused pcs_writeb(unsigned val, void __iomem *reg)
{
writeb(val, reg);
}
static void __maybe_unused pcs_writew(unsigned val, void __iomem *reg)
{
writew(val, reg);
}
static void __maybe_unused pcs_writel(unsigned val, void __iomem *reg)
{
writel(val, reg);
}
static int pcs_get_groups_count(struct pinctrl_dev *pctldev)
{
struct pcs_device *pcs;
pcs = pinctrl_dev_get_drvdata(pctldev);
return pcs->ngroups;
}
static const char *pcs_get_group_name(struct pinctrl_dev *pctldev,
unsigned gselector)
{
struct pcs_device *pcs;
struct pcs_pingroup *group;
pcs = pinctrl_dev_get_drvdata(pctldev);
group = radix_tree_lookup(&pcs->pgtree, gselector);
if (!group) {
dev_err(pcs->dev, "%s could not find pingroup%i\n",
__func__, gselector);
return NULL;
}
return group->name;
}
static int pcs_get_group_pins(struct pinctrl_dev *pctldev,
unsigned gselector,
const unsigned **pins,
unsigned *npins)
{
struct pcs_device *pcs;
struct pcs_pingroup *group;
pcs = pinctrl_dev_get_drvdata(pctldev);
group = radix_tree_lookup(&pcs->pgtree, gselector);
if (!group) {
dev_err(pcs->dev, "%s could not find pingroup%i\n",
__func__, gselector);
return -EINVAL;
}
*pins = group->gpins;
*npins = group->ngpins;
return 0;
}
static void pcs_pin_dbg_show(struct pinctrl_dev *pctldev,
struct seq_file *s,
unsigned pin)
{
struct pcs_device *pcs;
unsigned val, mux_bytes;
pcs = pinctrl_dev_get_drvdata(pctldev);
mux_bytes = pcs->width / BITS_PER_BYTE;
val = pcs->read(pcs->base + pin * mux_bytes);
seq_printf(s, "%08x %s " , val, DRIVER_NAME);
}
static void pcs_dt_free_map(struct pinctrl_dev *pctldev,
struct pinctrl_map *map, unsigned num_maps)
{
struct pcs_device *pcs;
pcs = pinctrl_dev_get_drvdata(pctldev);
devm_kfree(pcs->dev, map);
}
static int pcs_dt_node_to_map(struct pinctrl_dev *pctldev,
struct device_node *np_config,
struct pinctrl_map **map, unsigned *num_maps);
static const struct pinctrl_ops pcs_pinctrl_ops = {
.get_groups_count = pcs_get_groups_count,
.get_group_name = pcs_get_group_name,
.get_group_pins = pcs_get_group_pins,
.pin_dbg_show = pcs_pin_dbg_show,
.dt_node_to_map = pcs_dt_node_to_map,
.dt_free_map = pcs_dt_free_map,
};
static int pcs_get_functions_count(struct pinctrl_dev *pctldev)
{
struct pcs_device *pcs;
pcs = pinctrl_dev_get_drvdata(pctldev);
return pcs->nfuncs;
}
static const char *pcs_get_function_name(struct pinctrl_dev *pctldev,
unsigned fselector)
{
struct pcs_device *pcs;
struct pcs_function *func;
pcs = pinctrl_dev_get_drvdata(pctldev);
func = radix_tree_lookup(&pcs->ftree, fselector);
if (!func) {
dev_err(pcs->dev, "%s could not find function%i\n",
__func__, fselector);
return NULL;
}
return func->name;
}
static int pcs_get_function_groups(struct pinctrl_dev *pctldev,
unsigned fselector,
const char * const **groups,
unsigned * const ngroups)
{
struct pcs_device *pcs;
struct pcs_function *func;
pcs = pinctrl_dev_get_drvdata(pctldev);
func = radix_tree_lookup(&pcs->ftree, fselector);
if (!func) {
dev_err(pcs->dev, "%s could not find function%i\n",
__func__, fselector);
return -EINVAL;
}
*groups = func->pgnames;
*ngroups = func->npgnames;
return 0;
}
static int pcs_get_function(struct pinctrl_dev *pctldev, unsigned pin,
struct pcs_function **func)
{
struct pcs_device *pcs = pinctrl_dev_get_drvdata(pctldev);
struct pin_desc *pdesc = pin_desc_get(pctldev, pin);
const struct pinctrl_setting_mux *setting;
unsigned fselector;
/* If pin is not described in DTS & enabled, mux_setting is NULL. */
setting = pdesc->mux_setting;
if (!setting)
return -ENOTSUPP;
fselector = setting->func;
*func = radix_tree_lookup(&pcs->ftree, fselector);
if (!(*func)) {
dev_err(pcs->dev, "%s could not find function%i\n",
__func__, fselector);
return -ENOTSUPP;
}
return 0;
}
static int pcs_set_mux(struct pinctrl_dev *pctldev, unsigned fselector,
unsigned group)
{
struct pcs_device *pcs;
struct pcs_function *func;
int i;
pcs = pinctrl_dev_get_drvdata(pctldev);
/* If function mask is null, needn't enable it. */
if (!pcs->fmask)
return 0;
func = radix_tree_lookup(&pcs->ftree, fselector);
if (!func)
return -EINVAL;
dev_dbg(pcs->dev, "enabling %s function%i\n",
func->name, 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)
mask = vals->mask;
else
mask = pcs->fmask;
val &= ~mask;
val |= (vals->val & mask);
pcs->write(val, vals->reg);
raw_spin_unlock_irqrestore(&pcs->lock, flags);
}
return 0;
}
static int pcs_request_gpio(struct pinctrl_dev *pctldev,
struct pinctrl_gpio_range *range, unsigned pin)
{
struct pcs_device *pcs = pinctrl_dev_get_drvdata(pctldev);
struct pcs_gpiofunc_range *frange = NULL;
struct list_head *pos, *tmp;
int mux_bytes = 0;
unsigned data;
/* If function mask is null, return directly. */
if (!pcs->fmask)
return -ENOTSUPP;
list_for_each_safe(pos, tmp, &pcs->gpiofuncs) {
frange = list_entry(pos, struct pcs_gpiofunc_range, node);
if (pin >= frange->offset + frange->npins
|| pin < frange->offset)
continue;
mux_bytes = pcs->width / BITS_PER_BYTE;
data = pcs->read(pcs->base + pin * mux_bytes) & ~pcs->fmask;
data |= frange->gpiofunc;
pcs->write(data, pcs->base + pin * mux_bytes);
break;
}
return 0;
}
static const struct pinmux_ops pcs_pinmux_ops = {
.get_functions_count = pcs_get_functions_count,
.get_function_name = pcs_get_function_name,
.get_function_groups = pcs_get_function_groups,
.set_mux = pcs_set_mux,
.gpio_request_enable = pcs_request_gpio,
};
/* Clear BIAS value */
static void pcs_pinconf_clear_bias(struct pinctrl_dev *pctldev, unsigned pin)
{
unsigned long config;
int i;
for (i = 0; i < ARRAY_SIZE(pcs_bias); i++) {
config = pinconf_to_config_packed(pcs_bias[i], 0);
pcs_pinconf_set(pctldev, pin, &config, 1);
}
}
/*
* Check whether PIN_CONFIG_BIAS_DISABLE is valid.
* It's depend on that PULL_DOWN & PULL_UP configs are all invalid.
*/
static bool pcs_pinconf_bias_disable(struct pinctrl_dev *pctldev, unsigned pin)
{
unsigned long config;
int i;
for (i = 0; i < ARRAY_SIZE(pcs_bias); i++) {
config = pinconf_to_config_packed(pcs_bias[i], 0);
if (!pcs_pinconf_get(pctldev, pin, &config))
goto out;
}
return true;
out:
return false;
}
static int pcs_pinconf_get(struct pinctrl_dev *pctldev,
unsigned pin, unsigned long *config)
{
struct pcs_device *pcs = pinctrl_dev_get_drvdata(pctldev);
struct pcs_function *func;
enum pin_config_param param;
unsigned offset = 0, data = 0, i, j, ret;
ret = pcs_get_function(pctldev, pin, &func);
if (ret)
return ret;
for (i = 0; i < func->nconfs; i++) {
param = pinconf_to_config_param(*config);
if (param == PIN_CONFIG_BIAS_DISABLE) {
if (pcs_pinconf_bias_disable(pctldev, pin)) {
*config = 0;
return 0;
} else {
return -ENOTSUPP;
}
} else if (param != func->conf[i].param) {
continue;
}
offset = pin * (pcs->width / BITS_PER_BYTE);
data = pcs->read(pcs->base + offset) & func->conf[i].mask;
switch (func->conf[i].param) {
/* 4 parameters */
case PIN_CONFIG_BIAS_PULL_DOWN:
case PIN_CONFIG_BIAS_PULL_UP:
case PIN_CONFIG_INPUT_SCHMITT_ENABLE:
if ((data != func->conf[i].enable) ||
(data == func->conf[i].disable))
return -ENOTSUPP;
*config = 0;
break;
/* 2 parameters */
case PIN_CONFIG_INPUT_SCHMITT:
for (j = 0; j < func->nconfs; j++) {
switch (func->conf[j].param) {
case PIN_CONFIG_INPUT_SCHMITT_ENABLE:
if (data != func->conf[j].enable)
return -ENOTSUPP;
break;
default:
break;
}
}
*config = data;
break;
case PIN_CONFIG_DRIVE_STRENGTH:
case PIN_CONFIG_SLEW_RATE:
case PIN_CONFIG_LOW_POWER_MODE:
default:
*config = data;
break;
}
return 0;
}
return -ENOTSUPP;
}
static int pcs_pinconf_set(struct pinctrl_dev *pctldev,
unsigned pin, unsigned long *configs,
unsigned num_configs)
{
struct pcs_device *pcs = pinctrl_dev_get_drvdata(pctldev);
struct pcs_function *func;
unsigned offset = 0, shift = 0, i, data, ret;
u16 arg;
int j;
ret = pcs_get_function(pctldev, pin, &func);
if (ret)
return ret;
for (j = 0; j < num_configs; j++) {
for (i = 0; i < func->nconfs; i++) {
if (pinconf_to_config_param(configs[j])
!= func->conf[i].param)
continue;
offset = pin * (pcs->width / BITS_PER_BYTE);
data = pcs->read(pcs->base + offset);
arg = pinconf_to_config_argument(configs[j]);
switch (func->conf[i].param) {
/* 2 parameters */
case PIN_CONFIG_INPUT_SCHMITT:
case PIN_CONFIG_DRIVE_STRENGTH:
case PIN_CONFIG_SLEW_RATE:
case PIN_CONFIG_LOW_POWER_MODE:
shift = ffs(func->conf[i].mask) - 1;
data &= ~func->conf[i].mask;
data |= (arg << shift) & func->conf[i].mask;
break;
/* 4 parameters */
case PIN_CONFIG_BIAS_DISABLE:
pcs_pinconf_clear_bias(pctldev, pin);
break;
case PIN_CONFIG_BIAS_PULL_DOWN:
case PIN_CONFIG_BIAS_PULL_UP:
if (arg)
pcs_pinconf_clear_bias(pctldev, pin);
/* fall through */
case PIN_CONFIG_INPUT_SCHMITT_ENABLE:
data &= ~func->conf[i].mask;
if (arg)
data |= func->conf[i].enable;
else
data |= func->conf[i].disable;
break;
default:
return -ENOTSUPP;
}
pcs->write(data, pcs->base + offset);
break;
}
if (i >= func->nconfs)
return -ENOTSUPP;
} /* for each config */
return 0;
}
static int pcs_pinconf_group_get(struct pinctrl_dev *pctldev,
unsigned group, unsigned long *config)
{
const unsigned *pins;
unsigned npins, old = 0;
int i, ret;
ret = pcs_get_group_pins(pctldev, group, &pins, &npins);
if (ret)
return ret;
for (i = 0; i < npins; i++) {
if (pcs_pinconf_get(pctldev, pins[i], config))
return -ENOTSUPP;
/* configs do not match between two pins */
if (i && (old != *config))
return -ENOTSUPP;
old = *config;
}
return 0;
}
static int pcs_pinconf_group_set(struct pinctrl_dev *pctldev,
unsigned group, unsigned long *configs,
unsigned num_configs)
{
const unsigned *pins;
unsigned npins;
int i, ret;
ret = pcs_get_group_pins(pctldev, group, &pins, &npins);
if (ret)
return ret;
for (i = 0; i < npins; i++) {
if (pcs_pinconf_set(pctldev, pins[i], configs, num_configs))
return -ENOTSUPP;
}
return 0;
}
static void pcs_pinconf_dbg_show(struct pinctrl_dev *pctldev,
struct seq_file *s, unsigned pin)
{
}
static void pcs_pinconf_group_dbg_show(struct pinctrl_dev *pctldev,
struct seq_file *s, unsigned selector)
{
}
static void pcs_pinconf_config_dbg_show(struct pinctrl_dev *pctldev,
struct seq_file *s,
unsigned long config)
{
pinconf_generic_dump_config(pctldev, s, config);
}
static const struct pinconf_ops pcs_pinconf_ops = {
.pin_config_get = pcs_pinconf_get,
.pin_config_set = pcs_pinconf_set,
.pin_config_group_get = pcs_pinconf_group_get,
.pin_config_group_set = pcs_pinconf_group_set,
.pin_config_dbg_show = pcs_pinconf_dbg_show,
.pin_config_group_dbg_show = pcs_pinconf_group_dbg_show,
.pin_config_config_dbg_show = pcs_pinconf_config_dbg_show,
.is_generic = true,
};
/**
* pcs_add_pin() - add a pin to the static per controller pin array
* @pcs: pcs driver instance
* @offset: register offset from base
*/
static int pcs_add_pin(struct pcs_device *pcs, unsigned offset,
unsigned pin_pos)
{
struct pcs_soc_data *pcs_soc = &pcs->socdata;
struct pinctrl_pin_desc *pin;
struct pcs_name *pn;
int i;
i = pcs->pins.cur;
if (i >= pcs->desc.npins) {
dev_err(pcs->dev, "too many pins, max %i\n",
pcs->desc.npins);
return -ENOMEM;
}
if (pcs_soc->irq_enable_mask) {
unsigned val;
val = pcs->read(pcs->base + offset);
if (val & pcs_soc->irq_enable_mask) {
dev_dbg(pcs->dev, "irq enabled at boot for pin at %lx (%x), clearing\n",
(unsigned long)pcs->res->start + offset, val);
val &= ~pcs_soc->irq_enable_mask;
pcs->write(val, pcs->base + offset);
}
}
pin = &pcs->pins.pa[i];
pn = &pcs->names[i];
sprintf(pn->name, "%lx.%u",
(unsigned long)pcs->res->start + offset, pin_pos);
pin->name = pn->name;
pin->number = i;
pcs->pins.cur++;
return i;
}
/**
* pcs_allocate_pin_table() - adds all the pins for the pinctrl driver
* @pcs: pcs driver instance
*
* In case of errors, resources are freed in pcs_free_resources.
*
* If your hardware needs holes in the address space, then just set
* up multiple driver instances.
*/
static int pcs_allocate_pin_table(struct pcs_device *pcs)
{
int mux_bytes, nr_pins, i;
int num_pins_in_register = 0;
mux_bytes = pcs->width / BITS_PER_BYTE;
if (pcs->bits_per_mux) {
pcs->bits_per_pin = fls(pcs->fmask);
nr_pins = (pcs->size * BITS_PER_BYTE) / pcs->bits_per_pin;
num_pins_in_register = pcs->width / pcs->bits_per_pin;
} else {
nr_pins = pcs->size / mux_bytes;
}
dev_dbg(pcs->dev, "allocating %i pins\n", nr_pins);
pcs->pins.pa = devm_kzalloc(pcs->dev,
sizeof(*pcs->pins.pa) * nr_pins,
GFP_KERNEL);
if (!pcs->pins.pa)
return -ENOMEM;
pcs->names = devm_kzalloc(pcs->dev,
sizeof(struct pcs_name) * nr_pins,
GFP_KERNEL);
if (!pcs->names)
return -ENOMEM;
pcs->desc.pins = pcs->pins.pa;
pcs->desc.npins = nr_pins;
for (i = 0; i < pcs->desc.npins; i++) {
unsigned offset;
int res;
int byte_num;
int pin_pos = 0;
if (pcs->bits_per_mux) {
byte_num = (pcs->bits_per_pin * i) / BITS_PER_BYTE;
offset = (byte_num / mux_bytes) * mux_bytes;
pin_pos = i % num_pins_in_register;
} else {
offset = i * mux_bytes;
}
res = pcs_add_pin(pcs, offset, pin_pos);
if (res < 0) {
dev_err(pcs->dev, "error adding pins: %i\n", res);
return res;
}
}
return 0;
}
/**
* pcs_add_function() - adds a new function to the function list
* @pcs: pcs driver instance
* @np: device node of the mux entry
* @name: name of the function
* @vals: array of mux register value pairs used by the function
* @nvals: number of mux register value pairs
* @pgnames: array of pingroup names for the function
* @npgnames: number of pingroup names
*/
static struct pcs_function *pcs_add_function(struct pcs_device *pcs,
struct device_node *np,
const char *name,
struct pcs_func_vals *vals,
unsigned nvals,
const char **pgnames,
unsigned npgnames)
{
struct pcs_function *function;
function = devm_kzalloc(pcs->dev, sizeof(*function), GFP_KERNEL);
if (!function)
return NULL;
function->name = name;
function->vals = vals;
function->nvals = nvals;
function->pgnames = pgnames;
function->npgnames = npgnames;
mutex_lock(&pcs->mutex);
list_add_tail(&function->node, &pcs->functions);
radix_tree_insert(&pcs->ftree, pcs->nfuncs, function);
pcs->nfuncs++;
mutex_unlock(&pcs->mutex);
return function;
}
static void pcs_remove_function(struct pcs_device *pcs,
struct pcs_function *function)
{
int i;
mutex_lock(&pcs->mutex);
for (i = 0; i < pcs->nfuncs; i++) {
struct pcs_function *found;
found = radix_tree_lookup(&pcs->ftree, i);
if (found == function)
radix_tree_delete(&pcs->ftree, i);
}
list_del(&function->node);
mutex_unlock(&pcs->mutex);
}
/**
* pcs_add_pingroup() - add a pingroup to the pingroup list
* @pcs: pcs driver instance
* @np: device node of the mux entry
* @name: name of the pingroup
* @gpins: array of the pins that belong to the group
* @ngpins: number of pins in the group
*/
static int pcs_add_pingroup(struct pcs_device *pcs,
struct device_node *np,
const char *name,
int *gpins,
int ngpins)
{
struct pcs_pingroup *pingroup;
pingroup = devm_kzalloc(pcs->dev, sizeof(*pingroup), GFP_KERNEL);
if (!pingroup)
return -ENOMEM;
pingroup->name = name;
pingroup->np = np;
pingroup->gpins = gpins;
pingroup->ngpins = ngpins;
mutex_lock(&pcs->mutex);
list_add_tail(&pingroup->node, &pcs->pingroups);
radix_tree_insert(&pcs->pgtree, pcs->ngroups, pingroup);
pcs->ngroups++;
mutex_unlock(&pcs->mutex);
return 0;
}
/**
* pcs_get_pin_by_offset() - get a pin index based on the register offset
* @pcs: pcs driver instance
* @offset: register offset from the base
*
* Note that this is OK as long as the pins are in a static array.
*/
static int pcs_get_pin_by_offset(struct pcs_device *pcs, unsigned offset)
{
unsigned index;
if (offset >= pcs->size) {
dev_err(pcs->dev, "mux offset out of range: 0x%x (0x%x)\n",
offset, pcs->size);
return -EINVAL;
}
if (pcs->bits_per_mux)
index = (offset * BITS_PER_BYTE) / pcs->bits_per_pin;
else
index = offset / (pcs->width / BITS_PER_BYTE);
return index;
}
/*
* check whether data matches enable bits or disable bits
* Return value: 1 for matching enable bits, 0 for matching disable bits,
* and negative value for matching failure.
*/
static int pcs_config_match(unsigned data, unsigned enable, unsigned disable)
{
int ret = -EINVAL;
if (data == enable)
ret = 1;
else if (data == disable)
ret = 0;
return ret;
}
static void add_config(struct pcs_conf_vals **conf, enum pin_config_param param,
unsigned value, unsigned enable, unsigned disable,
unsigned mask)
{
(*conf)->param = param;
(*conf)->val = value;
(*conf)->enable = enable;
(*conf)->disable = disable;
(*conf)->mask = mask;
(*conf)++;
}
static void add_setting(unsigned long **setting, enum pin_config_param param,
unsigned arg)
{
**setting = pinconf_to_config_packed(param, arg);
(*setting)++;
}
/* add pinconf setting with 2 parameters */
static void pcs_add_conf2(struct pcs_device *pcs, struct device_node *np,
const char *name, enum pin_config_param param,
struct pcs_conf_vals **conf, unsigned long **settings)
{
unsigned value[2], shift;
int ret;
ret = of_property_read_u32_array(np, name, value, 2);
if (ret)
return;
/* set value & mask */
value[0] &= value[1];
shift = ffs(value[1]) - 1;
/* skip enable & disable */
add_config(conf, param, value[0], 0, 0, value[1]);
add_setting(settings, param, value[0] >> shift);
}
/* add pinconf setting with 4 parameters */
static void pcs_add_conf4(struct pcs_device *pcs, struct device_node *np,
const char *name, enum pin_config_param param,
struct pcs_conf_vals **conf, unsigned long **settings)
{
unsigned value[4];
int ret;
/* value to set, enable, disable, mask */
ret = of_property_read_u32_array(np, name, value, 4);
if (ret)
return;
if (!value[3]) {
dev_err(pcs->dev, "mask field of the property can't be 0\n");
return;
}
value[0] &= value[3];
value[1] &= value[3];
value[2] &= value[3];
ret = pcs_config_match(value[0], value[1], value[2]);
if (ret < 0)
dev_dbg(pcs->dev, "failed to match enable or disable bits\n");
add_config(conf, param, value[0], value[1], value[2], value[3]);
add_setting(settings, param, ret);
}
static int pcs_parse_pinconf(struct pcs_device *pcs, struct device_node *np,
struct pcs_function *func,
struct pinctrl_map **map)
{
struct pinctrl_map *m = *map;
int i = 0, nconfs = 0;
unsigned long *settings = NULL, *s = NULL;
struct pcs_conf_vals *conf = NULL;
struct pcs_conf_type prop2[] = {
{ "pinctrl-single,drive-strength", PIN_CONFIG_DRIVE_STRENGTH, },
{ "pinctrl-single,slew-rate", PIN_CONFIG_SLEW_RATE, },
{ "pinctrl-single,input-schmitt", PIN_CONFIG_INPUT_SCHMITT, },
{ "pinctrl-single,low-power-mode", PIN_CONFIG_LOW_POWER_MODE, },
};
struct pcs_conf_type prop4[] = {
{ "pinctrl-single,bias-pullup", PIN_CONFIG_BIAS_PULL_UP, },
{ "pinctrl-single,bias-pulldown", PIN_CONFIG_BIAS_PULL_DOWN, },
{ "pinctrl-single,input-schmitt-enable",
PIN_CONFIG_INPUT_SCHMITT_ENABLE, },
};
/* If pinconf isn't supported, don't parse properties in below. */
if (!PCS_HAS_PINCONF)
return 0;
/* cacluate how much properties are supported in current node */
for (i = 0; i < ARRAY_SIZE(prop2); i++) {
if (of_find_property(np, prop2[i].name, NULL))
nconfs++;
}
for (i = 0; i < ARRAY_SIZE(prop4); i++) {
if (of_find_property(np, prop4[i].name, NULL))
nconfs++;
}
if (!nconfs)
return 0;
func->conf = devm_kzalloc(pcs->dev,
sizeof(struct pcs_conf_vals) * nconfs,
GFP_KERNEL);
if (!func->conf)
return -ENOMEM;
func->nconfs = nconfs;
conf = &(func->conf[0]);
m++;
settings = devm_kzalloc(pcs->dev, sizeof(unsigned long) * nconfs,
GFP_KERNEL);
if (!settings)
return -ENOMEM;
s = &settings[0];
for (i = 0; i < ARRAY_SIZE(prop2); i++)
pcs_add_conf2(pcs, np, prop2[i].name, prop2[i].param,
&conf, &s);
for (i = 0; i < ARRAY_SIZE(prop4); i++)
pcs_add_conf4(pcs, np, prop4[i].name, prop4[i].param,
&conf, &s);
m->type = PIN_MAP_TYPE_CONFIGS_GROUP;
m->data.configs.group_or_pin = np->name;
m->data.configs.configs = settings;
m->data.configs.num_configs = nconfs;
return 0;
}
static void pcs_free_pingroups(struct pcs_device *pcs);
/**
* smux_parse_one_pinctrl_entry() - parses a device tree mux entry
* @pcs: pinctrl driver instance
* @np: device node of the mux entry
* @map: map entry
* @num_maps: number of map
* @pgnames: pingroup names
*
* Note that this binding currently supports only sets of one register + value.
*
* Also note that this driver tries to avoid understanding pin and function
* names because of the extra bloat they would cause especially in the case of
* a large number of pins. This driver just sets what is specified for the board
* in the .dts file. Further user space debugging tools can be developed to
* decipher the pin and function names using debugfs.
*
* If you are concerned about the boot time, set up the static pins in
* the bootloader, and only set up selected pins as device tree entries.
*/
static int pcs_parse_one_pinctrl_entry(struct pcs_device *pcs,
struct device_node *np,
struct pinctrl_map **map,
unsigned *num_maps,
const char **pgnames)
{
struct pcs_func_vals *vals;
const __be32 *mux;
int size, rows, *pins, index = 0, found = 0, res = -ENOMEM;
struct pcs_function *function;
mux = of_get_property(np, PCS_MUX_PINS_NAME, &size);
if ((!mux) || (size < sizeof(*mux) * 2)) {
dev_err(pcs->dev, "bad data for mux %s\n",
np->name);
return -EINVAL;
}
size /= sizeof(*mux); /* Number of elements in array */
rows = size / 2;
vals = devm_kzalloc(pcs->dev, sizeof(*vals) * rows, GFP_KERNEL);
if (!vals)
return -ENOMEM;
pins = devm_kzalloc(pcs->dev, sizeof(*pins) * rows, GFP_KERNEL);
if (!pins)
goto free_vals;
while (index < size) {
unsigned offset, val;
int pin;
offset = be32_to_cpup(mux + index++);
val = be32_to_cpup(mux + index++);
vals[found].reg = pcs->base + offset;
vals[found].val = val;
pin = pcs_get_pin_by_offset(pcs, offset);
if (pin < 0) {
dev_err(pcs->dev,
"could not add functions for %s %ux\n",
np->name, offset);
break;
}
pins[found++] = pin;
}
pgnames[0] = np->name;
function = pcs_add_function(pcs, np, np->name, vals, found, pgnames, 1);
if (!function)
goto free_pins;
res = pcs_add_pingroup(pcs, np, np->name, pins, found);
if (res < 0)
goto free_function;
(*map)->type = PIN_MAP_TYPE_MUX_GROUP;
(*map)->data.mux.group = np->name;
(*map)->data.mux.function = np->name;
if (PCS_HAS_PINCONF) {
res = pcs_parse_pinconf(pcs, np, function, map);
if (res)
goto free_pingroups;
*num_maps = 2;
} else {
*num_maps = 1;
}
return 0;
free_pingroups:
pcs_free_pingroups(pcs);
*num_maps = 1;
free_function:
pcs_remove_function(pcs, function);
free_pins:
devm_kfree(pcs->dev, pins);
free_vals:
devm_kfree(pcs->dev, vals);
return res;
}
#define PARAMS_FOR_BITS_PER_MUX 3
static int pcs_parse_bits_in_pinctrl_entry(struct pcs_device *pcs,
struct device_node *np,
struct pinctrl_map **map,
unsigned *num_maps,
const char **pgnames)
{
struct pcs_func_vals *vals;
const __be32 *mux;
int size, rows, *pins, index = 0, found = 0, res = -ENOMEM;
int npins_in_row;
struct pcs_function *function;
mux = of_get_property(np, PCS_MUX_BITS_NAME, &size);
if (!mux) {
dev_err(pcs->dev, "no valid property for %s\n", np->name);
return -EINVAL;
}
if (size < (sizeof(*mux) * PARAMS_FOR_BITS_PER_MUX)) {
dev_err(pcs->dev, "bad data for %s\n", np->name);
return -EINVAL;
}
/* Number of elements in array */
size /= sizeof(*mux);
rows = size / PARAMS_FOR_BITS_PER_MUX;
npins_in_row = pcs->width / pcs->bits_per_pin;
vals = devm_kzalloc(pcs->dev, sizeof(*vals) * rows * npins_in_row,
GFP_KERNEL);
if (!vals)
return -ENOMEM;
pins = devm_kzalloc(pcs->dev, sizeof(*pins) * rows * npins_in_row,
GFP_KERNEL);
if (!pins)
goto free_vals;
while (index < size) {
unsigned offset, val;
unsigned mask, bit_pos, val_pos, mask_pos, submask;
unsigned pin_num_from_lsb;
int pin;
offset = be32_to_cpup(mux + index++);
val = be32_to_cpup(mux + index++);
mask = be32_to_cpup(mux + index++);
/* Parse pins in each row from LSB */
while (mask) {
bit_pos = __ffs(mask);
pin_num_from_lsb = bit_pos / pcs->bits_per_pin;
mask_pos = ((pcs->fmask) << bit_pos);
val_pos = val & mask_pos;
submask = mask & mask_pos;
if ((mask & mask_pos) == 0) {
dev_err(pcs->dev,
"Invalid mask for %s at 0x%x\n",
np->name, offset);
break;
}
mask &= ~mask_pos;
if (submask != mask_pos) {
dev_warn(pcs->dev,
"Invalid submask 0x%x for %s at 0x%x\n",
submask, np->name, offset);
continue;
}
vals[found].mask = submask;
vals[found].reg = pcs->base + offset;
vals[found].val = val_pos;
pin = pcs_get_pin_by_offset(pcs, offset);
if (pin < 0) {
dev_err(pcs->dev,
"could not add functions for %s %ux\n",
np->name, offset);
break;
}
pins[found++] = pin + pin_num_from_lsb;
}
}
pgnames[0] = np->name;
function = pcs_add_function(pcs, np, np->name, vals, found, pgnames, 1);
if (!function)
goto free_pins;
res = pcs_add_pingroup(pcs, np, np->name, pins, found);
if (res < 0)
goto free_function;
(*map)->type = PIN_MAP_TYPE_MUX_GROUP;
(*map)->data.mux.group = np->name;
(*map)->data.mux.function = np->name;
if (PCS_HAS_PINCONF) {
dev_err(pcs->dev, "pinconf not supported\n");
goto free_pingroups;
}
*num_maps = 1;
return 0;
free_pingroups:
pcs_free_pingroups(pcs);
*num_maps = 1;
free_function:
pcs_remove_function(pcs, function);
free_pins:
devm_kfree(pcs->dev, pins);
free_vals:
devm_kfree(pcs->dev, vals);
return res;
}
/**
* pcs_dt_node_to_map() - allocates and parses pinctrl maps
* @pctldev: pinctrl instance
* @np_config: device tree pinmux entry
* @map: array of map entries
* @num_maps: number of maps
*/
static int pcs_dt_node_to_map(struct pinctrl_dev *pctldev,
struct device_node *np_config,
struct pinctrl_map **map, unsigned *num_maps)
{
struct pcs_device *pcs;
const char **pgnames;
int ret;
pcs = pinctrl_dev_get_drvdata(pctldev);
/* create 2 maps. One is for pinmux, and the other is for pinconf. */
*map = devm_kzalloc(pcs->dev, sizeof(**map) * 2, GFP_KERNEL);
if (!*map)
return -ENOMEM;
*num_maps = 0;
pgnames = devm_kzalloc(pcs->dev, sizeof(*pgnames), GFP_KERNEL);
if (!pgnames) {
ret = -ENOMEM;
goto free_map;
}
if (pcs->bits_per_mux) {
ret = pcs_parse_bits_in_pinctrl_entry(pcs, np_config, map,
num_maps, pgnames);
if (ret < 0) {
dev_err(pcs->dev, "no pins entries for %s\n",
np_config->name);
goto free_pgnames;
}
} else {
ret = pcs_parse_one_pinctrl_entry(pcs, np_config, map,
num_maps, pgnames);
if (ret < 0) {
dev_err(pcs->dev, "no pins entries for %s\n",
np_config->name);
goto free_pgnames;
}
}
return 0;
free_pgnames:
devm_kfree(pcs->dev, pgnames);
free_map:
devm_kfree(pcs->dev, *map);
return ret;
}
/**
* pcs_free_funcs() - free memory used by functions
* @pcs: pcs driver instance
*/
static void pcs_free_funcs(struct pcs_device *pcs)
{
struct list_head *pos, *tmp;
int i;
mutex_lock(&pcs->mutex);
for (i = 0; i < pcs->nfuncs; i++) {
struct pcs_function *func;
func = radix_tree_lookup(&pcs->ftree, i);
if (!func)
continue;
radix_tree_delete(&pcs->ftree, i);
}
list_for_each_safe(pos, tmp, &pcs->functions) {
struct pcs_function *function;
function = list_entry(pos, struct pcs_function, node);
list_del(&function->node);
}
mutex_unlock(&pcs->mutex);
}
/**
* pcs_free_pingroups() - free memory used by pingroups
* @pcs: pcs driver instance
*/
static void pcs_free_pingroups(struct pcs_device *pcs)
{
struct list_head *pos, *tmp;
int i;
mutex_lock(&pcs->mutex);
for (i = 0; i < pcs->ngroups; i++) {
struct pcs_pingroup *pingroup;
pingroup = radix_tree_lookup(&pcs->pgtree, i);
if (!pingroup)
continue;
radix_tree_delete(&pcs->pgtree, i);
}
list_for_each_safe(pos, tmp, &pcs->pingroups) {
struct pcs_pingroup *pingroup;
pingroup = list_entry(pos, struct pcs_pingroup, node);
list_del(&pingroup->node);
}
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);
pinctrl_unregister(pcs->pctl);
pcs_free_funcs(pcs);
pcs_free_pingroups(pcs);
}
#define PCS_GET_PROP_U32(name, reg, err) \
do { \
ret = of_property_read_u32(np, name, reg); \
if (ret) { \
dev_err(pcs->dev, err); \
return ret; \
} \
} while (0);
static const struct of_device_id pcs_of_match[];
static int pcs_add_gpio_func(struct device_node *node, struct pcs_device *pcs)
{
const char *propname = "pinctrl-single,gpio-range";
const char *cellname = "#pinctrl-single,gpio-range-cells";
struct of_phandle_args gpiospec;
struct pcs_gpiofunc_range *range;
int ret, i;
for (i = 0; ; i++) {
ret = of_parse_phandle_with_args(node, propname, cellname,
i, &gpiospec);
/* Do not treat it as error. Only treat it as end condition. */
if (ret) {
ret = 0;
break;
}
range = devm_kzalloc(pcs->dev, sizeof(*range), GFP_KERNEL);
if (!range) {
ret = -ENOMEM;
break;
}
range->offset = gpiospec.args[0];
range->npins = gpiospec.args[1];
range->gpiofunc = gpiospec.args[2];
mutex_lock(&pcs->mutex);
list_add_tail(&range->node, &pcs->gpiofuncs);
mutex_unlock(&pcs->mutex);
}
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);
/* flush posted write */
mask = pcs->read(pcswi->reg);
raw_spin_unlock(&pcs->lock);
}
if (pcs_soc->rearm)
pcs_soc->rearm();
}
/**
* 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(struct irq_desc *desc)
{
struct pcs_soc_data *pcs_soc = irq_desc_get_handler_data(desc);
struct irq_chip *chip;
chip = irq_desc_get_chip(desc);
chained_irq_enter(chip, desc);
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);
irq_set_lockdep_class(irq, &pcs_lock_class);
irq_set_noprobe(irq);
return 0;
}
static const 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 |
IRQF_NO_THREAD,
name, pcs_soc);
if (res) {
pcs_soc->irq = -1;
return res;
}
} else {
irq_set_chained_handler_and_data(pcs_soc->irq,
pcs_irq_chain_handler,
pcs_soc);
}
/*
* 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,
pm_message_t state)
{
struct pcs_device *pcs;
pcs = platform_get_drvdata(pdev);
if (!pcs)
return -EINVAL;
return pinctrl_force_sleep(pcs->pctl);
}
static int pinctrl_single_resume(struct platform_device *pdev)
{
struct pcs_device *pcs;
pcs = platform_get_drvdata(pdev);
if (!pcs)
return -EINVAL;
return pinctrl_force_default(pcs->pctl);
}
#endif
static int pcs_probe(struct platform_device *pdev)
{
struct device_node *np = pdev->dev.of_node;
const struct of_device_id *match;
struct pcs_pdata *pdata;
struct resource *res;
struct pcs_device *pcs;
const struct pcs_soc_data *soc;
int ret;
match = of_match_device(pcs_of_match, &pdev->dev);
if (!match)
return -EINVAL;
pcs = devm_kzalloc(&pdev->dev, sizeof(*pcs), GFP_KERNEL);
if (!pcs) {
dev_err(&pdev->dev, "could not allocate\n");
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");
ret = of_property_read_u32(np, "pinctrl-single,function-mask",
&pcs->fmask);
if (!ret) {
pcs->fshift = __ffs(pcs->fmask);
pcs->fmax = pcs->fmask >> pcs->fshift;
} else {
/* If mask property doesn't exist, function mux is invalid. */
pcs->fmask = 0;
pcs->fshift = 0;
pcs->fmax = 0;
}
ret = of_property_read_u32(np, "pinctrl-single,function-off",
&pcs->foff);
if (ret)
pcs->foff = PCS_OFF_DISABLED;
pcs->bits_per_mux = of_property_read_bool(np,
"pinctrl-single,bit-per-mux");
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!res) {
dev_err(pcs->dev, "could not get resource\n");
return -ENODEV;
}
pcs->res = devm_request_mem_region(pcs->dev, res->start,
resource_size(res), DRIVER_NAME);
if (!pcs->res) {
dev_err(pcs->dev, "could not get mem_region\n");
return -EBUSY;
}
pcs->size = resource_size(pcs->res);
pcs->base = devm_ioremap(pcs->dev, pcs->res->start, pcs->size);
if (!pcs->base) {
dev_err(pcs->dev, "could not ioremap\n");
return -ENODEV;
}
INIT_RADIX_TREE(&pcs->pgtree, GFP_KERNEL);
INIT_RADIX_TREE(&pcs->ftree, GFP_KERNEL);
platform_set_drvdata(pdev, pcs);
switch (pcs->width) {
case 8:
pcs->read = pcs_readb;
pcs->write = pcs_writeb;
break;
case 16:
pcs->read = pcs_readw;
pcs->write = pcs_writew;
break;
case 32:
pcs->read = pcs_readl;
pcs->write = pcs_writel;
break;
default:
break;
}
pcs->desc.name = DRIVER_NAME;
pcs->desc.pctlops = &pcs_pinctrl_ops;
pcs->desc.pmxops = &pcs_pinmux_ops;
if (PCS_HAS_PINCONF)
pcs->desc.confops = &pcs_pinconf_ops;
pcs->desc.owner = THIS_MODULE;
ret = pcs_allocate_pin_table(pcs);
if (ret < 0)
goto free;
pcs->pctl = pinctrl_register(&pcs->desc, pcs->dev, pcs);
if (IS_ERR(pcs->pctl)) {
dev_err(pcs->dev, "could not register single pinctrl driver\n");
ret = PTR_ERR(pcs->pctl);
goto free;
}
ret = pcs_add_gpio_func(np, pcs);
if (ret < 0)
goto free;
pcs->socdata.irq = irq_of_parse_and_map(np, 0);
if (pcs->socdata.irq)
pcs->flags |= PCS_FEAT_IRQ;
/* We still need auxdata for some omaps for PRM interrupts */
pdata = dev_get_platdata(&pdev->dev);
if (pdata) {
if (pdata->rearm)
pcs->socdata.rearm = pdata->rearm;
if (pdata->irq) {
pcs->socdata.irq = pdata->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);
return 0;
free:
pcs_free_resources(pcs);
return ret;
}
static int pcs_remove(struct platform_device *pdev)
{
struct pcs_device *pcs = platform_get_drvdata(pdev);
if (!pcs)
return 0;
pcs_free_resources(pcs);
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_dra7 = {
.irq_enable_mask = (1 << 24), /* WAKEUPENABLE */
.irq_status_mask = (1 << 25), /* WAKEUPEVENT */
};
static const struct pcs_soc_data pinctrl_single_am437x = {
.flags = PCS_QUIRK_SHARED_IRQ,
.irq_enable_mask = (1 << 29), /* OMAP_WAKEUP_EN */
.irq_status_mask = (1 << 30), /* OMAP_WAKEUP_EVENT */
};
static const struct pcs_soc_data pinctrl_single = {
};
static const struct pcs_soc_data pinconf_single = {
.flags = PCS_FEAT_PINCONF,
};
static const 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 = "ti,dra7-padconf", .data = &pinctrl_single_dra7 },
{ .compatible = "ti,am437-padconf", .data = &pinctrl_single_am437x },
{ .compatible = "pinctrl-single", .data = &pinctrl_single },
{ .compatible = "pinconf-single", .data = &pinconf_single },
{ },
};
MODULE_DEVICE_TABLE(of, pcs_of_match);
static struct platform_driver pcs_driver = {
.probe = pcs_probe,
.remove = pcs_remove,
.driver = {
.name = DRIVER_NAME,
.of_match_table = pcs_of_match,
},
#ifdef CONFIG_PM
.suspend = pinctrl_single_suspend,
.resume = pinctrl_single_resume,
#endif
};
module_platform_driver(pcs_driver);
MODULE_AUTHOR("Tony Lindgren <tony@atomide.com>");
MODULE_DESCRIPTION("One-register-per-pin type device tree based pinctrl driver");
MODULE_LICENSE("GPL v2");