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linux/drivers/pinctrl/freescale/pinctrl-imx.c
Kees Cook a86854d0c5 treewide: devm_kzalloc() -> devm_kcalloc() 
The devm_kzalloc() function has a 2-factor argument form, devm_kcalloc().
This patch replaces cases of:

        devm_kzalloc(handle, a * b, gfp)

with:
        devm_kcalloc(handle, a * b, gfp)

as well as handling cases of:

        devm_kzalloc(handle, a * b * c, gfp)

with:

        devm_kzalloc(handle, array3_size(a, b, c), gfp)

as it's slightly less ugly than:

        devm_kcalloc(handle, array_size(a, b), c, gfp)

This does, however, attempt to ignore constant size factors like:

        devm_kzalloc(handle, 4 * 1024, gfp)

though any constants defined via macros get caught up in the conversion.

Any factors with a sizeof() of "unsigned char", "char", and "u8" were
dropped, since they're redundant.

Some manual whitespace fixes were needed in this patch, as Coccinelle
really liked to write "=devm_kcalloc..." instead of "= devm_kcalloc...".

The Coccinelle script used for this was:

// Fix redundant parens around sizeof().
@@
expression HANDLE;
type TYPE;
expression THING, E;
@@

(
  devm_kzalloc(HANDLE,
-	(sizeof(TYPE)) * E
+	sizeof(TYPE) * E
  , ...)
|
  devm_kzalloc(HANDLE,
-	(sizeof(THING)) * E
+	sizeof(THING) * E
  , ...)
)

// Drop single-byte sizes and redundant parens.
@@
expression HANDLE;
expression COUNT;
typedef u8;
typedef __u8;
@@

(
  devm_kzalloc(HANDLE,
-	sizeof(u8) * (COUNT)
+	COUNT
  , ...)
|
  devm_kzalloc(HANDLE,
-	sizeof(__u8) * (COUNT)
+	COUNT
  , ...)
|
  devm_kzalloc(HANDLE,
-	sizeof(char) * (COUNT)
+	COUNT
  , ...)
|
  devm_kzalloc(HANDLE,
-	sizeof(unsigned char) * (COUNT)
+	COUNT
  , ...)
|
  devm_kzalloc(HANDLE,
-	sizeof(u8) * COUNT
+	COUNT
  , ...)
|
  devm_kzalloc(HANDLE,
-	sizeof(__u8) * COUNT
+	COUNT
  , ...)
|
  devm_kzalloc(HANDLE,
-	sizeof(char) * COUNT
+	COUNT
  , ...)
|
  devm_kzalloc(HANDLE,
-	sizeof(unsigned char) * COUNT
+	COUNT
  , ...)
)

// 2-factor product with sizeof(type/expression) and identifier or constant.
@@
expression HANDLE;
type TYPE;
expression THING;
identifier COUNT_ID;
constant COUNT_CONST;
@@

(
- devm_kzalloc
+ devm_kcalloc
  (HANDLE,
-	sizeof(TYPE) * (COUNT_ID)
+	COUNT_ID, sizeof(TYPE)
  , ...)
|
- devm_kzalloc
+ devm_kcalloc
  (HANDLE,
-	sizeof(TYPE) * COUNT_ID
+	COUNT_ID, sizeof(TYPE)
  , ...)
|
- devm_kzalloc
+ devm_kcalloc
  (HANDLE,
-	sizeof(TYPE) * (COUNT_CONST)
+	COUNT_CONST, sizeof(TYPE)
  , ...)
|
- devm_kzalloc
+ devm_kcalloc
  (HANDLE,
-	sizeof(TYPE) * COUNT_CONST
+	COUNT_CONST, sizeof(TYPE)
  , ...)
|
- devm_kzalloc
+ devm_kcalloc
  (HANDLE,
-	sizeof(THING) * (COUNT_ID)
+	COUNT_ID, sizeof(THING)
  , ...)
|
- devm_kzalloc
+ devm_kcalloc
  (HANDLE,
-	sizeof(THING) * COUNT_ID
+	COUNT_ID, sizeof(THING)
  , ...)
|
- devm_kzalloc
+ devm_kcalloc
  (HANDLE,
-	sizeof(THING) * (COUNT_CONST)
+	COUNT_CONST, sizeof(THING)
  , ...)
|
- devm_kzalloc
+ devm_kcalloc
  (HANDLE,
-	sizeof(THING) * COUNT_CONST
+	COUNT_CONST, sizeof(THING)
  , ...)
)

// 2-factor product, only identifiers.
@@
expression HANDLE;
identifier SIZE, COUNT;
@@

- devm_kzalloc
+ devm_kcalloc
  (HANDLE,
-	SIZE * COUNT
+	COUNT, SIZE
  , ...)

// 3-factor product with 1 sizeof(type) or sizeof(expression), with
// redundant parens removed.
@@
expression HANDLE;
expression THING;
identifier STRIDE, COUNT;
type TYPE;
@@

(
  devm_kzalloc(HANDLE,
-	sizeof(TYPE) * (COUNT) * (STRIDE)
+	array3_size(COUNT, STRIDE, sizeof(TYPE))
  , ...)
|
  devm_kzalloc(HANDLE,
-	sizeof(TYPE) * (COUNT) * STRIDE
+	array3_size(COUNT, STRIDE, sizeof(TYPE))
  , ...)
|
  devm_kzalloc(HANDLE,
-	sizeof(TYPE) * COUNT * (STRIDE)
+	array3_size(COUNT, STRIDE, sizeof(TYPE))
  , ...)
|
  devm_kzalloc(HANDLE,
-	sizeof(TYPE) * COUNT * STRIDE
+	array3_size(COUNT, STRIDE, sizeof(TYPE))
  , ...)
|
  devm_kzalloc(HANDLE,
-	sizeof(THING) * (COUNT) * (STRIDE)
+	array3_size(COUNT, STRIDE, sizeof(THING))
  , ...)
|
  devm_kzalloc(HANDLE,
-	sizeof(THING) * (COUNT) * STRIDE
+	array3_size(COUNT, STRIDE, sizeof(THING))
  , ...)
|
  devm_kzalloc(HANDLE,
-	sizeof(THING) * COUNT * (STRIDE)
+	array3_size(COUNT, STRIDE, sizeof(THING))
  , ...)
|
  devm_kzalloc(HANDLE,
-	sizeof(THING) * COUNT * STRIDE
+	array3_size(COUNT, STRIDE, sizeof(THING))
  , ...)
)

// 3-factor product with 2 sizeof(variable), with redundant parens removed.
@@
expression HANDLE;
expression THING1, THING2;
identifier COUNT;
type TYPE1, TYPE2;
@@

(
  devm_kzalloc(HANDLE,
-	sizeof(TYPE1) * sizeof(TYPE2) * COUNT
+	array3_size(COUNT, sizeof(TYPE1), sizeof(TYPE2))
  , ...)
|
  devm_kzalloc(HANDLE,
-	sizeof(TYPE1) * sizeof(THING2) * (COUNT)
+	array3_size(COUNT, sizeof(TYPE1), sizeof(TYPE2))
  , ...)
|
  devm_kzalloc(HANDLE,
-	sizeof(THING1) * sizeof(THING2) * COUNT
+	array3_size(COUNT, sizeof(THING1), sizeof(THING2))
  , ...)
|
  devm_kzalloc(HANDLE,
-	sizeof(THING1) * sizeof(THING2) * (COUNT)
+	array3_size(COUNT, sizeof(THING1), sizeof(THING2))
  , ...)
|
  devm_kzalloc(HANDLE,
-	sizeof(TYPE1) * sizeof(THING2) * COUNT
+	array3_size(COUNT, sizeof(TYPE1), sizeof(THING2))
  , ...)
|
  devm_kzalloc(HANDLE,
-	sizeof(TYPE1) * sizeof(THING2) * (COUNT)
+	array3_size(COUNT, sizeof(TYPE1), sizeof(THING2))
  , ...)
)

// 3-factor product, only identifiers, with redundant parens removed.
@@
expression HANDLE;
identifier STRIDE, SIZE, COUNT;
@@

(
  devm_kzalloc(HANDLE,
-	(COUNT) * STRIDE * SIZE
+	array3_size(COUNT, STRIDE, SIZE)
  , ...)
|
  devm_kzalloc(HANDLE,
-	COUNT * (STRIDE) * SIZE
+	array3_size(COUNT, STRIDE, SIZE)
  , ...)
|
  devm_kzalloc(HANDLE,
-	COUNT * STRIDE * (SIZE)
+	array3_size(COUNT, STRIDE, SIZE)
  , ...)
|
  devm_kzalloc(HANDLE,
-	(COUNT) * (STRIDE) * SIZE
+	array3_size(COUNT, STRIDE, SIZE)
  , ...)
|
  devm_kzalloc(HANDLE,
-	COUNT * (STRIDE) * (SIZE)
+	array3_size(COUNT, STRIDE, SIZE)
  , ...)
|
  devm_kzalloc(HANDLE,
-	(COUNT) * STRIDE * (SIZE)
+	array3_size(COUNT, STRIDE, SIZE)
  , ...)
|
  devm_kzalloc(HANDLE,
-	(COUNT) * (STRIDE) * (SIZE)
+	array3_size(COUNT, STRIDE, SIZE)
  , ...)
|
  devm_kzalloc(HANDLE,
-	COUNT * STRIDE * SIZE
+	array3_size(COUNT, STRIDE, SIZE)
  , ...)
)

// Any remaining multi-factor products, first at least 3-factor products,
// when they're not all constants...
@@
expression HANDLE;
expression E1, E2, E3;
constant C1, C2, C3;
@@

(
  devm_kzalloc(HANDLE, C1 * C2 * C3, ...)
|
  devm_kzalloc(HANDLE,
-	(E1) * E2 * E3
+	array3_size(E1, E2, E3)
  , ...)
|
  devm_kzalloc(HANDLE,
-	(E1) * (E2) * E3
+	array3_size(E1, E2, E3)
  , ...)
|
  devm_kzalloc(HANDLE,
-	(E1) * (E2) * (E3)
+	array3_size(E1, E2, E3)
  , ...)
|
  devm_kzalloc(HANDLE,
-	E1 * E2 * E3
+	array3_size(E1, E2, E3)
  , ...)
)

// And then all remaining 2 factors products when they're not all constants,
// keeping sizeof() as the second factor argument.
@@
expression HANDLE;
expression THING, E1, E2;
type TYPE;
constant C1, C2, C3;
@@

(
  devm_kzalloc(HANDLE, sizeof(THING) * C2, ...)
|
  devm_kzalloc(HANDLE, sizeof(TYPE) * C2, ...)
|
  devm_kzalloc(HANDLE, C1 * C2 * C3, ...)
|
  devm_kzalloc(HANDLE, C1 * C2, ...)
|
- devm_kzalloc
+ devm_kcalloc
  (HANDLE,
-	sizeof(TYPE) * (E2)
+	E2, sizeof(TYPE)
  , ...)
|
- devm_kzalloc
+ devm_kcalloc
  (HANDLE,
-	sizeof(TYPE) * E2
+	E2, sizeof(TYPE)
  , ...)
|
- devm_kzalloc
+ devm_kcalloc
  (HANDLE,
-	sizeof(THING) * (E2)
+	E2, sizeof(THING)
  , ...)
|
- devm_kzalloc
+ devm_kcalloc
  (HANDLE,
-	sizeof(THING) * E2
+	E2, sizeof(THING)
  , ...)
|
- devm_kzalloc
+ devm_kcalloc
  (HANDLE,
-	(E1) * E2
+	E1, E2
  , ...)
|
- devm_kzalloc
+ devm_kcalloc
  (HANDLE,
-	(E1) * (E2)
+	E1, E2
  , ...)
|
- devm_kzalloc
+ devm_kcalloc
  (HANDLE,
-	E1 * E2
+	E1, E2
  , ...)
)

Signed-off-by: Kees Cook <keescook@chromium.org>
2018-06-12 16:19:22 -07:00

783 lines
20 KiB
C
Raw Blame History

// SPDX-License-Identifier: GPL-2.0+
//
// Core driver for the imx pin controller
//
// Copyright (C) 2012 Freescale Semiconductor, Inc.
// Copyright (C) 2012 Linaro Ltd.
//
// Author: Dong Aisheng <dong.aisheng@linaro.org>
#include <linux/err.h>
#include <linux/init.h>
#include <linux/io.h>
#include <linux/mfd/syscon.h>
#include <linux/of.h>
#include <linux/of_device.h>
#include <linux/of_address.h>
#include <linux/pinctrl/machine.h>
#include <linux/pinctrl/pinconf.h>
#include <linux/pinctrl/pinctrl.h>
#include <linux/pinctrl/pinmux.h>
#include <linux/slab.h>
#include <linux/regmap.h>
#include "../core.h"
#include "../pinconf.h"
#include "../pinmux.h"
#include "pinctrl-imx.h"
/* The bits in CONFIG cell defined in binding doc*/
#define IMX_NO_PAD_CTL 0x80000000 /* no pin config need */
#define IMX_PAD_SION 0x40000000 /* set SION */
static inline const struct group_desc *imx_pinctrl_find_group_by_name(
struct pinctrl_dev *pctldev,
const char *name)
{
const struct group_desc *grp = NULL;
int i;
for (i = 0; i < pctldev->num_groups; i++) {
grp = pinctrl_generic_get_group(pctldev, i);
if (grp && !strcmp(grp->name, name))
break;
}
return grp;
}
static void imx_pin_dbg_show(struct pinctrl_dev *pctldev, struct seq_file *s,
unsigned offset)
{
seq_printf(s, "%s", dev_name(pctldev->dev));
}
static int imx_dt_node_to_map(struct pinctrl_dev *pctldev,
struct device_node *np,
struct pinctrl_map **map, unsigned *num_maps)
{
struct imx_pinctrl *ipctl = pinctrl_dev_get_drvdata(pctldev);
const struct group_desc *grp;
struct pinctrl_map *new_map;
struct device_node *parent;
int map_num = 1;
int i, j;
/*
* first find the group of this node and check if we need create
* config maps for pins
*/
grp = imx_pinctrl_find_group_by_name(pctldev, np->name);
if (!grp) {
dev_err(ipctl->dev, "unable to find group for node %s\n",
np->name);
return -EINVAL;
}
for (i = 0; i < grp->num_pins; i++) {
struct imx_pin *pin = &((struct imx_pin *)(grp->data))[i];
if (!(pin->config & IMX_NO_PAD_CTL))
map_num++;
}
new_map = kmalloc_array(map_num, sizeof(struct pinctrl_map),
GFP_KERNEL);
if (!new_map)
return -ENOMEM;
*map = new_map;
*num_maps = map_num;
/* create mux map */
parent = of_get_parent(np);
if (!parent) {
kfree(new_map);
return -EINVAL;
}
new_map[0].type = PIN_MAP_TYPE_MUX_GROUP;
new_map[0].data.mux.function = parent->name;
new_map[0].data.mux.group = np->name;
of_node_put(parent);
/* create config map */
new_map++;
for (i = j = 0; i < grp->num_pins; i++) {
struct imx_pin *pin = &((struct imx_pin *)(grp->data))[i];
if (!(pin->config & IMX_NO_PAD_CTL)) {
new_map[j].type = PIN_MAP_TYPE_CONFIGS_PIN;
new_map[j].data.configs.group_or_pin =
pin_get_name(pctldev, pin->pin);
new_map[j].data.configs.configs = &pin->config;
new_map[j].data.configs.num_configs = 1;
j++;
}
}
dev_dbg(pctldev->dev, "maps: function %s group %s num %d\n",
(*map)->data.mux.function, (*map)->data.mux.group, map_num);
return 0;
}
static void imx_dt_free_map(struct pinctrl_dev *pctldev,
struct pinctrl_map *map, unsigned num_maps)
{
kfree(map);
}
static const struct pinctrl_ops imx_pctrl_ops = {
.get_groups_count = pinctrl_generic_get_group_count,
.get_group_name = pinctrl_generic_get_group_name,
.get_group_pins = pinctrl_generic_get_group_pins,
.pin_dbg_show = imx_pin_dbg_show,
.dt_node_to_map = imx_dt_node_to_map,
.dt_free_map = imx_dt_free_map,
};
static int imx_pmx_set(struct pinctrl_dev *pctldev, unsigned selector,
unsigned group)
{
struct imx_pinctrl *ipctl = pinctrl_dev_get_drvdata(pctldev);
const struct imx_pinctrl_soc_info *info = ipctl->info;
const struct imx_pin_reg *pin_reg;
unsigned int npins, pin_id;
int i;
struct group_desc *grp = NULL;
struct function_desc *func = NULL;
/*
* Configure the mux mode for each pin in the group for a specific
* function.
*/
grp = pinctrl_generic_get_group(pctldev, group);
if (!grp)
return -EINVAL;
func = pinmux_generic_get_function(pctldev, selector);
if (!func)
return -EINVAL;
npins = grp->num_pins;
dev_dbg(ipctl->dev, "enable function %s group %s\n",
func->name, grp->name);
for (i = 0; i < npins; i++) {
struct imx_pin *pin = &((struct imx_pin *)(grp->data))[i];
pin_id = pin->pin;
pin_reg = &ipctl->pin_regs[pin_id];
if (pin_reg->mux_reg == -1) {
dev_dbg(ipctl->dev, "Pin(%s) does not support mux function\n",
info->pins[pin_id].name);
continue;
}
if (info->flags & SHARE_MUX_CONF_REG) {
u32 reg;
reg = readl(ipctl->base + pin_reg->mux_reg);
reg &= ~info->mux_mask;
reg |= (pin->mux_mode << info->mux_shift);
writel(reg, ipctl->base + pin_reg->mux_reg);
dev_dbg(ipctl->dev, "write: offset 0x%x val 0x%x\n",
pin_reg->mux_reg, reg);
} else {
writel(pin->mux_mode, ipctl->base + pin_reg->mux_reg);
dev_dbg(ipctl->dev, "write: offset 0x%x val 0x%x\n",
pin_reg->mux_reg, pin->mux_mode);
}
/*
* If the select input value begins with 0xff, it's a quirky
* select input and the value should be interpreted as below.
* 31 23 15 7 0
* | 0xff | shift | width | select |
* It's used to work around the problem that the select
* input for some pin is not implemented in the select
* input register but in some general purpose register.
* We encode the select input value, width and shift of
* the bit field into input_val cell of pin function ID
* in device tree, and then decode them here for setting
* up the select input bits in general purpose register.
*/
if (pin->input_val >> 24 == 0xff) {
u32 val = pin->input_val;
u8 select = val & 0xff;
u8 width = (val >> 8) & 0xff;
u8 shift = (val >> 16) & 0xff;
u32 mask = ((1 << width) - 1) << shift;
/*
* The input_reg[i] here is actually some IOMUXC general
* purpose register, not regular select input register.
*/
val = readl(ipctl->base + pin->input_reg);
val &= ~mask;
val |= select << shift;
writel(val, ipctl->base + pin->input_reg);
} else if (pin->input_reg) {
/*
* Regular select input register can never be at offset
* 0, and we only print register value for regular case.
*/
if (ipctl->input_sel_base)
writel(pin->input_val, ipctl->input_sel_base +
pin->input_reg);
else
writel(pin->input_val, ipctl->base +
pin->input_reg);
dev_dbg(ipctl->dev,
"==>select_input: offset 0x%x val 0x%x\n",
pin->input_reg, pin->input_val);
}
}
return 0;
}
struct pinmux_ops imx_pmx_ops = {
.get_functions_count = pinmux_generic_get_function_count,
.get_function_name = pinmux_generic_get_function_name,
.get_function_groups = pinmux_generic_get_function_groups,
.set_mux = imx_pmx_set,
};
/* decode generic config into raw register values */
static u32 imx_pinconf_decode_generic_config(struct imx_pinctrl *ipctl,
unsigned long *configs,
unsigned int num_configs)
{
const struct imx_pinctrl_soc_info *info = ipctl->info;
const struct imx_cfg_params_decode *decode;
enum pin_config_param param;
u32 raw_config = 0;
u32 param_val;
int i, j;
WARN_ON(num_configs > info->num_decodes);
for (i = 0; i < num_configs; i++) {
param = pinconf_to_config_param(configs[i]);
param_val = pinconf_to_config_argument(configs[i]);
decode = info->decodes;
for (j = 0; j < info->num_decodes; j++) {
if (param == decode->param) {
if (decode->invert)
param_val = !param_val;
raw_config |= (param_val << decode->shift)
& decode->mask;
break;
}
decode++;
}
}
if (info->fixup)
info->fixup(configs, num_configs, &raw_config);
return raw_config;
}
static u32 imx_pinconf_parse_generic_config(struct device_node *np,
struct imx_pinctrl *ipctl)
{
const struct imx_pinctrl_soc_info *info = ipctl->info;
struct pinctrl_dev *pctl = ipctl->pctl;
unsigned int num_configs;
unsigned long *configs;
int ret;
if (!info->generic_pinconf)
return 0;
ret = pinconf_generic_parse_dt_config(np, pctl, &configs,
&num_configs);
if (ret)
return 0;
return imx_pinconf_decode_generic_config(ipctl, configs, num_configs);
}
static int imx_pinconf_get(struct pinctrl_dev *pctldev,
unsigned pin_id, unsigned long *config)
{
struct imx_pinctrl *ipctl = pinctrl_dev_get_drvdata(pctldev);
const struct imx_pinctrl_soc_info *info = ipctl->info;
const struct imx_pin_reg *pin_reg = &ipctl->pin_regs[pin_id];
if (pin_reg->conf_reg == -1) {
dev_err(ipctl->dev, "Pin(%s) does not support config function\n",
info->pins[pin_id].name);
return -EINVAL;
}
*config = readl(ipctl->base + pin_reg->conf_reg);
if (info->flags & SHARE_MUX_CONF_REG)
*config &= ~info->mux_mask;
return 0;
}
static int imx_pinconf_set(struct pinctrl_dev *pctldev,
unsigned pin_id, unsigned long *configs,
unsigned num_configs)
{
struct imx_pinctrl *ipctl = pinctrl_dev_get_drvdata(pctldev);
const struct imx_pinctrl_soc_info *info = ipctl->info;
const struct imx_pin_reg *pin_reg = &ipctl->pin_regs[pin_id];
int i;
if (pin_reg->conf_reg == -1) {
dev_err(ipctl->dev, "Pin(%s) does not support config function\n",
info->pins[pin_id].name);
return -EINVAL;
}
dev_dbg(ipctl->dev, "pinconf set pin %s\n",
info->pins[pin_id].name);
for (i = 0; i < num_configs; i++) {
if (info->flags & SHARE_MUX_CONF_REG) {
u32 reg;
reg = readl(ipctl->base + pin_reg->conf_reg);
reg &= info->mux_mask;
reg |= configs[i];
writel(reg, ipctl->base + pin_reg->conf_reg);
dev_dbg(ipctl->dev, "write: offset 0x%x val 0x%x\n",
pin_reg->conf_reg, reg);
} else {
writel(configs[i], ipctl->base + pin_reg->conf_reg);
dev_dbg(ipctl->dev, "write: offset 0x%x val 0x%lx\n",
pin_reg->conf_reg, configs[i]);
}
} /* for each config */
return 0;
}
static void imx_pinconf_dbg_show(struct pinctrl_dev *pctldev,
struct seq_file *s, unsigned pin_id)
{
struct imx_pinctrl *ipctl = pinctrl_dev_get_drvdata(pctldev);
const struct imx_pin_reg *pin_reg = &ipctl->pin_regs[pin_id];
unsigned long config;
if (!pin_reg || pin_reg->conf_reg == -1) {
seq_puts(s, "N/A");
return;
}
config = readl(ipctl->base + pin_reg->conf_reg);
seq_printf(s, "0x%lx", config);
}
static void imx_pinconf_group_dbg_show(struct pinctrl_dev *pctldev,
struct seq_file *s, unsigned group)
{
struct group_desc *grp;
unsigned long config;
const char *name;
int i, ret;
if (group > pctldev->num_groups)
return;
seq_puts(s, "\n");
grp = pinctrl_generic_get_group(pctldev, group);
if (!grp)
return;
for (i = 0; i < grp->num_pins; i++) {
struct imx_pin *pin = &((struct imx_pin *)(grp->data))[i];
name = pin_get_name(pctldev, pin->pin);
ret = imx_pinconf_get(pctldev, pin->pin, &config);
if (ret)
return;
seq_printf(s, " %s: 0x%lx\n", name, config);
}
}
static const struct pinconf_ops imx_pinconf_ops = {
.pin_config_get = imx_pinconf_get,
.pin_config_set = imx_pinconf_set,
.pin_config_dbg_show = imx_pinconf_dbg_show,
.pin_config_group_dbg_show = imx_pinconf_group_dbg_show,
};
/*
* Each pin represented in fsl,pins consists of a number of u32 PIN_FUNC_ID
* and 1 u32 CONFIG, the total size is PIN_FUNC_ID + CONFIG for each pin.
* For generic_pinconf case, there's no extra u32 CONFIG.
*
* PIN_FUNC_ID format:
* Default:
* <mux_reg conf_reg input_reg mux_mode input_val>
* SHARE_MUX_CONF_REG:
* <mux_conf_reg input_reg mux_mode input_val>
*/
#define FSL_PIN_SIZE 24
#define FSL_PIN_SHARE_SIZE 20
static int imx_pinctrl_parse_groups(struct device_node *np,
struct group_desc *grp,
struct imx_pinctrl *ipctl,
u32 index)
{
const struct imx_pinctrl_soc_info *info = ipctl->info;
int size, pin_size;
const __be32 *list;
int i;
u32 config;
dev_dbg(ipctl->dev, "group(%d): %s\n", index, np->name);
if (info->flags & SHARE_MUX_CONF_REG)
pin_size = FSL_PIN_SHARE_SIZE;
else
pin_size = FSL_PIN_SIZE;
if (info->generic_pinconf)
pin_size -= 4;
/* Initialise group */
grp->name = np->name;
/*
* the binding format is fsl,pins = <PIN_FUNC_ID CONFIG ...>,
* do sanity check and calculate pins number
*
* First try legacy 'fsl,pins' property, then fall back to the
* generic 'pinmux'.
*
* Note: for generic 'pinmux' case, there's no CONFIG part in
* the binding format.
*/
list = of_get_property(np, "fsl,pins", &size);
if (!list) {
list = of_get_property(np, "pinmux", &size);
if (!list) {
dev_err(ipctl->dev,
"no fsl,pins and pins property in node %pOF\n", np);
return -EINVAL;
}
}
/* we do not check return since it's safe node passed down */
if (!size || size % pin_size) {
dev_err(ipctl->dev, "Invalid fsl,pins or pins property in node %pOF\n", np);
return -EINVAL;
}
/* first try to parse the generic pin config */
config = imx_pinconf_parse_generic_config(np, ipctl);
grp->num_pins = size / pin_size;
grp->data = devm_kcalloc(ipctl->dev,
grp->num_pins, sizeof(struct imx_pin),
GFP_KERNEL);
grp->pins = devm_kcalloc(ipctl->dev,
grp->num_pins, sizeof(unsigned int),
GFP_KERNEL);
if (!grp->pins || !grp->data)
return -ENOMEM;
for (i = 0; i < grp->num_pins; i++) {
u32 mux_reg = be32_to_cpu(*list++);
u32 conf_reg;
unsigned int pin_id;
struct imx_pin_reg *pin_reg;
struct imx_pin *pin = &((struct imx_pin *)(grp->data))[i];
if (!(info->flags & ZERO_OFFSET_VALID) && !mux_reg)
mux_reg = -1;
if (info->flags & SHARE_MUX_CONF_REG) {
conf_reg = mux_reg;
} else {
conf_reg = be32_to_cpu(*list++);
if (!conf_reg)
conf_reg = -1;
}
pin_id = (mux_reg != -1) ? mux_reg / 4 : conf_reg / 4;
pin_reg = &ipctl->pin_regs[pin_id];
pin->pin = pin_id;
grp->pins[i] = pin_id;
pin_reg->mux_reg = mux_reg;
pin_reg->conf_reg = conf_reg;
pin->input_reg = be32_to_cpu(*list++);
pin->mux_mode = be32_to_cpu(*list++);
pin->input_val = be32_to_cpu(*list++);
if (info->generic_pinconf) {
/* generic pin config decoded */
pin->config = config;
} else {
/* legacy pin config read from devicetree */
config = be32_to_cpu(*list++);
/* SION bit is in mux register */
if (config & IMX_PAD_SION)
pin->mux_mode |= IOMUXC_CONFIG_SION;
pin->config = config & ~IMX_PAD_SION;
}
dev_dbg(ipctl->dev, "%s: 0x%x 0x%08lx", info->pins[pin_id].name,
pin->mux_mode, pin->config);
}
return 0;
}
static int imx_pinctrl_parse_functions(struct device_node *np,
struct imx_pinctrl *ipctl,
u32 index)
{
struct pinctrl_dev *pctl = ipctl->pctl;
struct device_node *child;
struct function_desc *func;
struct group_desc *grp;
u32 i = 0;
dev_dbg(pctl->dev, "parse function(%d): %s\n", index, np->name);
func = pinmux_generic_get_function(pctl, index);
if (!func)
return -EINVAL;
/* Initialise function */
func->name = np->name;
func->num_group_names = of_get_child_count(np);
if (func->num_group_names == 0) {
dev_err(ipctl->dev, "no groups defined in %pOF\n", np);
return -EINVAL;
}
func->group_names = devm_kcalloc(ipctl->dev, func->num_group_names,
sizeof(char *), GFP_KERNEL);
if (!func->group_names)
return -ENOMEM;
for_each_child_of_node(np, child) {
func->group_names[i] = child->name;
grp = devm_kzalloc(ipctl->dev, sizeof(struct group_desc),
GFP_KERNEL);
if (!grp)
return -ENOMEM;
mutex_lock(&ipctl->mutex);
radix_tree_insert(&pctl->pin_group_tree,
ipctl->group_index++, grp);
mutex_unlock(&ipctl->mutex);
imx_pinctrl_parse_groups(child, grp, ipctl, i++);
}
return 0;
}
/*
* Check if the DT contains pins in the direct child nodes. This indicates the
* newer DT format to store pins. This function returns true if the first found
* fsl,pins property is in a child of np. Otherwise false is returned.
*/
static bool imx_pinctrl_dt_is_flat_functions(struct device_node *np)
{
struct device_node *function_np;
struct device_node *pinctrl_np;
for_each_child_of_node(np, function_np) {
if (of_property_read_bool(function_np, "fsl,pins"))
return true;
for_each_child_of_node(function_np, pinctrl_np) {
if (of_property_read_bool(pinctrl_np, "fsl,pins"))
return false;
}
}
return true;
}
static int imx_pinctrl_probe_dt(struct platform_device *pdev,
struct imx_pinctrl *ipctl)
{
struct device_node *np = pdev->dev.of_node;
struct device_node *child;
struct pinctrl_dev *pctl = ipctl->pctl;
u32 nfuncs = 0;
u32 i = 0;
bool flat_funcs;
if (!np)
return -ENODEV;
flat_funcs = imx_pinctrl_dt_is_flat_functions(np);
if (flat_funcs) {
nfuncs = 1;
} else {
nfuncs = of_get_child_count(np);
if (nfuncs == 0) {
dev_err(&pdev->dev, "no functions defined\n");
return -EINVAL;
}
}
for (i = 0; i < nfuncs; i++) {
struct function_desc *function;
function = devm_kzalloc(&pdev->dev, sizeof(*function),
GFP_KERNEL);
if (!function)
return -ENOMEM;
mutex_lock(&ipctl->mutex);
radix_tree_insert(&pctl->pin_function_tree, i, function);
mutex_unlock(&ipctl->mutex);
}
pctl->num_functions = nfuncs;
ipctl->group_index = 0;
if (flat_funcs) {
pctl->num_groups = of_get_child_count(np);
} else {
pctl->num_groups = 0;
for_each_child_of_node(np, child)
pctl->num_groups += of_get_child_count(child);
}
if (flat_funcs) {
imx_pinctrl_parse_functions(np, ipctl, 0);
} else {
i = 0;
for_each_child_of_node(np, child)
imx_pinctrl_parse_functions(child, ipctl, i++);
}
return 0;
}
/*
* imx_free_resources() - free memory used by this driver
* @info: info driver instance
*/
static void imx_free_resources(struct imx_pinctrl *ipctl)
{
if (ipctl->pctl)
pinctrl_unregister(ipctl->pctl);
}
int imx_pinctrl_probe(struct platform_device *pdev,
const struct imx_pinctrl_soc_info *info)
{
struct regmap_config config = { .name = "gpr" };
struct device_node *dev_np = pdev->dev.of_node;
struct pinctrl_desc *imx_pinctrl_desc;
struct device_node *np;
struct imx_pinctrl *ipctl;
struct resource *res;
struct regmap *gpr;
int ret, i;
if (!info || !info->pins || !info->npins) {
dev_err(&pdev->dev, "wrong pinctrl info\n");
return -EINVAL;
}
if (info->gpr_compatible) {
gpr = syscon_regmap_lookup_by_compatible(info->gpr_compatible);
if (!IS_ERR(gpr))
regmap_attach_dev(&pdev->dev, gpr, &config);
}
/* Create state holders etc for this driver */
ipctl = devm_kzalloc(&pdev->dev, sizeof(*ipctl), GFP_KERNEL);
if (!ipctl)
return -ENOMEM;
ipctl->pin_regs = devm_kmalloc_array(&pdev->dev,
info->npins, sizeof(*ipctl->pin_regs),
GFP_KERNEL);
if (!ipctl->pin_regs)
return -ENOMEM;
for (i = 0; i < info->npins; i++) {
ipctl->pin_regs[i].mux_reg = -1;
ipctl->pin_regs[i].conf_reg = -1;
}
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
ipctl->base = devm_ioremap_resource(&pdev->dev, res);
if (IS_ERR(ipctl->base))
return PTR_ERR(ipctl->base);
if (of_property_read_bool(dev_np, "fsl,input-sel")) {
np = of_parse_phandle(dev_np, "fsl,input-sel", 0);
if (!np) {
dev_err(&pdev->dev, "iomuxc fsl,input-sel property not found\n");
return -EINVAL;
}
ipctl->input_sel_base = of_iomap(np, 0);
of_node_put(np);
if (!ipctl->input_sel_base) {
dev_err(&pdev->dev,
"iomuxc input select base address not found\n");
return -ENOMEM;
}
}
imx_pinctrl_desc = devm_kzalloc(&pdev->dev, sizeof(*imx_pinctrl_desc),
GFP_KERNEL);
if (!imx_pinctrl_desc)
return -ENOMEM;
imx_pinctrl_desc->name = dev_name(&pdev->dev);
imx_pinctrl_desc->pins = info->pins;
imx_pinctrl_desc->npins = info->npins;
imx_pinctrl_desc->pctlops = &imx_pctrl_ops;
imx_pinctrl_desc->pmxops = &imx_pmx_ops;
imx_pinctrl_desc->confops = &imx_pinconf_ops;
imx_pinctrl_desc->owner = THIS_MODULE;
/* for generic pinconf */
imx_pinctrl_desc->custom_params = info->custom_params;
imx_pinctrl_desc->num_custom_params = info->num_custom_params;
/* platform specific callback */
imx_pmx_ops.gpio_set_direction = info->gpio_set_direction;
mutex_init(&ipctl->mutex);
ipctl->info = info;
ipctl->dev = &pdev->dev;
platform_set_drvdata(pdev, ipctl);
ret = devm_pinctrl_register_and_init(&pdev->dev,
imx_pinctrl_desc, ipctl,
&ipctl->pctl);
if (ret) {
dev_err(&pdev->dev, "could not register IMX pinctrl driver\n");
goto free;
}
ret = imx_pinctrl_probe_dt(pdev, ipctl);
if (ret) {
dev_err(&pdev->dev, "fail to probe dt properties\n");
goto free;
}
dev_info(&pdev->dev, "initialized IMX pinctrl driver\n");
return pinctrl_enable(ipctl->pctl);
free:
imx_free_resources(ipctl);
return ret;
}
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