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linux-stable/drivers/pinctrl/bcm/pinctrl-ns.c
Rafał Miłecki a49d784d5a pinctrl: bcm: ns: support updated DT binding as syscon subnode 
Documentation has been recently updated specifying that pinctrl should
be subnode of the CRU "syscon". Support that by using parent node for
regmap and reading "offset" property from the DT.

Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
2018-12-21 11:45:49 +01:00

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// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (C) 2018 Rafał Miłecki <rafal@milecki.pl>
*/
#include <linux/err.h>
#include <linux/io.h>
#include <linux/mfd/syscon.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_device.h>
#include <linux/pinctrl/pinconf-generic.h>
#include <linux/pinctrl/pinctrl.h>
#include <linux/pinctrl/pinmux.h>
#include <linux/platform_device.h>
#include <linux/regmap.h>
#include <linux/slab.h>
#define FLAG_BCM4708 BIT(1)
#define FLAG_BCM4709 BIT(2)
#define FLAG_BCM53012 BIT(3)
struct ns_pinctrl {
struct device *dev;
unsigned int chipset_flag;
struct pinctrl_dev *pctldev;
struct regmap *regmap;
u32 offset;
struct pinctrl_desc pctldesc;
struct ns_pinctrl_group *groups;
unsigned int num_groups;
struct ns_pinctrl_function *functions;
unsigned int num_functions;
};
/*
* Pins
*/
static const struct pinctrl_pin_desc ns_pinctrl_pins[] = {
{ 0, "spi_clk", (void *)(FLAG_BCM4708 | FLAG_BCM4709 | FLAG_BCM53012) },
{ 1, "spi_ss", (void *)(FLAG_BCM4708 | FLAG_BCM4709 | FLAG_BCM53012) },
{ 2, "spi_mosi", (void *)(FLAG_BCM4708 | FLAG_BCM4709 | FLAG_BCM53012) },
{ 3, "spi_miso", (void *)(FLAG_BCM4708 | FLAG_BCM4709 | FLAG_BCM53012) },
{ 4, "i2c_scl", (void *)(FLAG_BCM4708 | FLAG_BCM4709 | FLAG_BCM53012) },
{ 5, "i2c_sda", (void *)(FLAG_BCM4708 | FLAG_BCM4709 | FLAG_BCM53012) },
{ 6, "mdc", (void *)(FLAG_BCM4709 | FLAG_BCM53012) },
{ 7, "mdio", (void *)(FLAG_BCM4709 | FLAG_BCM53012) },
{ 8, "pwm0", (void *)(FLAG_BCM4708 | FLAG_BCM4709 | FLAG_BCM53012) },
{ 9, "pwm1", (void *)(FLAG_BCM4708 | FLAG_BCM4709 | FLAG_BCM53012) },
{ 10, "pwm2", (void *)(FLAG_BCM4708 | FLAG_BCM4709 | FLAG_BCM53012) },
{ 11, "pwm3", (void *)(FLAG_BCM4708 | FLAG_BCM4709 | FLAG_BCM53012) },
{ 12, "uart1_rx", (void *)(FLAG_BCM4708 | FLAG_BCM4709 | FLAG_BCM53012) },
{ 13, "uart1_tx", (void *)(FLAG_BCM4708 | FLAG_BCM4709 | FLAG_BCM53012) },
{ 14, "uart1_cts", (void *)(FLAG_BCM4708 | FLAG_BCM4709 | FLAG_BCM53012) },
{ 15, "uart1_rts", (void *)(FLAG_BCM4708 | FLAG_BCM4709 | FLAG_BCM53012) },
{ 16, "uart2_rx", (void *)(FLAG_BCM4709 | FLAG_BCM53012) },
{ 17, "uart2_tx", (void *)(FLAG_BCM4709 | FLAG_BCM53012) },
/* TODO { ??, "xtal_out", (void *)(FLAG_BCM4709) }, */
{ 22, "sdio_pwr", (void *)(FLAG_BCM4709 | FLAG_BCM53012) },
{ 23, "sdio_en_1p8v", (void *)(FLAG_BCM4709 | FLAG_BCM53012) },
};
/*
* Groups
*/
struct ns_pinctrl_group {
const char *name;
const unsigned int *pins;
const unsigned int num_pins;
unsigned int chipsets;
};
static const unsigned int spi_pins[] = { 0, 1, 2, 3 };
static const unsigned int i2c_pins[] = { 4, 5 };
static const unsigned int mdio_pins[] = { 6, 7 };
static const unsigned int pwm0_pins[] = { 8 };
static const unsigned int pwm1_pins[] = { 9 };
static const unsigned int pwm2_pins[] = { 10 };
static const unsigned int pwm3_pins[] = { 11 };
static const unsigned int uart1_pins[] = { 12, 13, 14, 15 };
static const unsigned int uart2_pins[] = { 16, 17 };
static const unsigned int sdio_pwr_pins[] = { 22 };
static const unsigned int sdio_1p8v_pins[] = { 23 };
#define NS_GROUP(_name, _pins, _chipsets) \
{ \
.name = _name, \
.pins = _pins, \
.num_pins = ARRAY_SIZE(_pins), \
.chipsets = _chipsets, \
}
static const struct ns_pinctrl_group ns_pinctrl_groups[] = {
NS_GROUP("spi_grp", spi_pins, FLAG_BCM4708 | FLAG_BCM4709 | FLAG_BCM53012),
NS_GROUP("i2c_grp", i2c_pins, FLAG_BCM4708 | FLAG_BCM4709 | FLAG_BCM53012),
NS_GROUP("mdio_grp", mdio_pins, FLAG_BCM4709 | FLAG_BCM53012),
NS_GROUP("pwm0_grp", pwm0_pins, FLAG_BCM4708 | FLAG_BCM4709 | FLAG_BCM53012),
NS_GROUP("pwm1_grp", pwm1_pins, FLAG_BCM4708 | FLAG_BCM4709 | FLAG_BCM53012),
NS_GROUP("pwm2_grp", pwm2_pins, FLAG_BCM4708 | FLAG_BCM4709 | FLAG_BCM53012),
NS_GROUP("pwm3_grp", pwm3_pins, FLAG_BCM4708 | FLAG_BCM4709 | FLAG_BCM53012),
NS_GROUP("uart1_grp", uart1_pins, FLAG_BCM4708 | FLAG_BCM4709 | FLAG_BCM53012),
NS_GROUP("uart2_grp", uart2_pins, FLAG_BCM4709 | FLAG_BCM53012),
NS_GROUP("sdio_pwr_grp", sdio_pwr_pins, FLAG_BCM4709 | FLAG_BCM53012),
NS_GROUP("sdio_1p8v_grp", sdio_1p8v_pins, FLAG_BCM4709 | FLAG_BCM53012),
};
/*
* Functions
*/
struct ns_pinctrl_function {
const char *name;
const char * const *groups;
const unsigned int num_groups;
unsigned int chipsets;
};
static const char * const spi_groups[] = { "spi_grp" };
static const char * const i2c_groups[] = { "i2c_grp" };
static const char * const mdio_groups[] = { "mdio_grp" };
static const char * const pwm_groups[] = { "pwm0_grp", "pwm1_grp", "pwm2_grp",
"pwm3_grp" };
static const char * const uart1_groups[] = { "uart1_grp" };
static const char * const uart2_groups[] = { "uart2_grp" };
static const char * const sdio_groups[] = { "sdio_pwr_grp", "sdio_1p8v_grp" };
#define NS_FUNCTION(_name, _groups, _chipsets) \
{ \
.name = _name, \
.groups = _groups, \
.num_groups = ARRAY_SIZE(_groups), \
.chipsets = _chipsets, \
}
static const struct ns_pinctrl_function ns_pinctrl_functions[] = {
NS_FUNCTION("spi", spi_groups, FLAG_BCM4708 | FLAG_BCM4709 | FLAG_BCM53012),
NS_FUNCTION("i2c", i2c_groups, FLAG_BCM4708 | FLAG_BCM4709 | FLAG_BCM53012),
NS_FUNCTION("mdio", mdio_groups, FLAG_BCM4709 | FLAG_BCM53012),
NS_FUNCTION("pwm", pwm_groups, FLAG_BCM4708 | FLAG_BCM4709 | FLAG_BCM53012),
NS_FUNCTION("uart1", uart1_groups, FLAG_BCM4708 | FLAG_BCM4709 | FLAG_BCM53012),
NS_FUNCTION("uart2", uart2_groups, FLAG_BCM4709 | FLAG_BCM53012),
NS_FUNCTION("sdio", sdio_groups, FLAG_BCM4709 | FLAG_BCM53012),
};
/*
* Groups code
*/
static int ns_pinctrl_get_groups_count(struct pinctrl_dev *pctrl_dev)
{
struct ns_pinctrl *ns_pinctrl = pinctrl_dev_get_drvdata(pctrl_dev);
return ns_pinctrl->num_groups;
}
static const char *ns_pinctrl_get_group_name(struct pinctrl_dev *pctrl_dev,
unsigned int selector)
{
struct ns_pinctrl *ns_pinctrl = pinctrl_dev_get_drvdata(pctrl_dev);
return ns_pinctrl->groups[selector].name;
}
static int ns_pinctrl_get_group_pins(struct pinctrl_dev *pctrl_dev,
unsigned int selector,
const unsigned int **pins,
unsigned int *num_pins)
{
struct ns_pinctrl *ns_pinctrl = pinctrl_dev_get_drvdata(pctrl_dev);
*pins = ns_pinctrl->groups[selector].pins;
*num_pins = ns_pinctrl->groups[selector].num_pins;
return 0;
}
static const struct pinctrl_ops ns_pinctrl_ops = {
.get_groups_count = ns_pinctrl_get_groups_count,
.get_group_name = ns_pinctrl_get_group_name,
.get_group_pins = ns_pinctrl_get_group_pins,
.dt_node_to_map = pinconf_generic_dt_node_to_map_group,
.dt_free_map = pinconf_generic_dt_free_map,
};
/*
* Functions code
*/
static int ns_pinctrl_get_functions_count(struct pinctrl_dev *pctrl_dev)
{
struct ns_pinctrl *ns_pinctrl = pinctrl_dev_get_drvdata(pctrl_dev);
return ns_pinctrl->num_functions;
}
static const char *ns_pinctrl_get_function_name(struct pinctrl_dev *pctrl_dev,
unsigned int selector)
{
struct ns_pinctrl *ns_pinctrl = pinctrl_dev_get_drvdata(pctrl_dev);
return ns_pinctrl->functions[selector].name;
}
static int ns_pinctrl_get_function_groups(struct pinctrl_dev *pctrl_dev,
unsigned int selector,
const char * const **groups,
unsigned * const num_groups)
{
struct ns_pinctrl *ns_pinctrl = pinctrl_dev_get_drvdata(pctrl_dev);
*groups = ns_pinctrl->functions[selector].groups;
*num_groups = ns_pinctrl->functions[selector].num_groups;
return 0;
}
static int ns_pinctrl_set_mux(struct pinctrl_dev *pctrl_dev,
unsigned int func_select,
unsigned int grp_select)
{
struct ns_pinctrl *ns_pinctrl = pinctrl_dev_get_drvdata(pctrl_dev);
u32 unset = 0;
u32 tmp;
int i;
for (i = 0; i < ns_pinctrl->groups[grp_select].num_pins; i++) {
int pin_number = ns_pinctrl->groups[grp_select].pins[i];
unset |= BIT(pin_number);
}
regmap_read(ns_pinctrl->regmap, ns_pinctrl->offset, &tmp);
tmp &= ~unset;
regmap_write(ns_pinctrl->regmap, ns_pinctrl->offset, tmp);
return 0;
}
static const struct pinmux_ops ns_pinctrl_pmxops = {
.get_functions_count = ns_pinctrl_get_functions_count,
.get_function_name = ns_pinctrl_get_function_name,
.get_function_groups = ns_pinctrl_get_function_groups,
.set_mux = ns_pinctrl_set_mux,
};
/*
* Controller code
*/
static struct pinctrl_desc ns_pinctrl_desc = {
.name = "pinctrl-ns",
.pctlops = &ns_pinctrl_ops,
.pmxops = &ns_pinctrl_pmxops,
};
static const struct of_device_id ns_pinctrl_of_match_table[] = {
{ .compatible = "brcm,bcm4708-pinmux", .data = (void *)FLAG_BCM4708, },
{ .compatible = "brcm,bcm4709-pinmux", .data = (void *)FLAG_BCM4709, },
{ .compatible = "brcm,bcm53012-pinmux", .data = (void *)FLAG_BCM53012, },
{ }
};
static int ns_pinctrl_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct device_node *np = dev->of_node;
const struct of_device_id *of_id;
struct ns_pinctrl *ns_pinctrl;
struct pinctrl_desc *pctldesc;
struct pinctrl_pin_desc *pin;
struct ns_pinctrl_group *group;
struct ns_pinctrl_function *function;
int i;
ns_pinctrl = devm_kzalloc(dev, sizeof(*ns_pinctrl), GFP_KERNEL);
if (!ns_pinctrl)
return -ENOMEM;
pctldesc = &ns_pinctrl->pctldesc;
platform_set_drvdata(pdev, ns_pinctrl);
/* Set basic properties */
ns_pinctrl->dev = dev;
of_id = of_match_device(ns_pinctrl_of_match_table, dev);
if (!of_id)
return -EINVAL;
ns_pinctrl->chipset_flag = (uintptr_t)of_id->data;
ns_pinctrl->regmap = syscon_node_to_regmap(of_get_parent(np));
if (IS_ERR(ns_pinctrl->regmap)) {
int err = PTR_ERR(ns_pinctrl->regmap);
dev_err(dev, "Failed to map pinctrl regs: %d\n", err);
return err;
}
if (of_property_read_u32(np, "offset", &ns_pinctrl->offset)) {
dev_err(dev, "Failed to get register offset\n");
return -ENOENT;
}
memcpy(pctldesc, &ns_pinctrl_desc, sizeof(*pctldesc));
/* Set pinctrl properties */
pctldesc->pins = devm_kcalloc(dev, ARRAY_SIZE(ns_pinctrl_pins),
sizeof(struct pinctrl_pin_desc),
GFP_KERNEL);
if (!pctldesc->pins)
return -ENOMEM;
for (i = 0, pin = (struct pinctrl_pin_desc *)&pctldesc->pins[0];
i < ARRAY_SIZE(ns_pinctrl_pins); i++) {
const struct pinctrl_pin_desc *src = &ns_pinctrl_pins[i];
unsigned int chipsets = (uintptr_t)src->drv_data;
if (chipsets & ns_pinctrl->chipset_flag) {
memcpy(pin++, src, sizeof(*src));
pctldesc->npins++;
}
}
ns_pinctrl->groups = devm_kcalloc(dev, ARRAY_SIZE(ns_pinctrl_groups),
sizeof(struct ns_pinctrl_group),
GFP_KERNEL);
if (!ns_pinctrl->groups)
return -ENOMEM;
for (i = 0, group = &ns_pinctrl->groups[0];
i < ARRAY_SIZE(ns_pinctrl_groups); i++) {
const struct ns_pinctrl_group *src = &ns_pinctrl_groups[i];
if (src->chipsets & ns_pinctrl->chipset_flag) {
memcpy(group++, src, sizeof(*src));
ns_pinctrl->num_groups++;
}
}
ns_pinctrl->functions = devm_kcalloc(dev,
ARRAY_SIZE(ns_pinctrl_functions),
sizeof(struct ns_pinctrl_function),
GFP_KERNEL);
if (!ns_pinctrl->functions)
return -ENOMEM;
for (i = 0, function = &ns_pinctrl->functions[0];
i < ARRAY_SIZE(ns_pinctrl_functions); i++) {
const struct ns_pinctrl_function *src = &ns_pinctrl_functions[i];
if (src->chipsets & ns_pinctrl->chipset_flag) {
memcpy(function++, src, sizeof(*src));
ns_pinctrl->num_functions++;
}
}
/* Register */
ns_pinctrl->pctldev = devm_pinctrl_register(dev, pctldesc, ns_pinctrl);
if (IS_ERR(ns_pinctrl->pctldev)) {
dev_err(dev, "Failed to register pinctrl\n");
return PTR_ERR(ns_pinctrl->pctldev);
}
return 0;
}
static struct platform_driver ns_pinctrl_driver = {
.probe = ns_pinctrl_probe,
.driver = {
.name = "ns-pinmux",
.of_match_table = ns_pinctrl_of_match_table,
},
};
module_platform_driver(ns_pinctrl_driver);
MODULE_AUTHOR("Rafał Miłecki");
MODULE_LICENSE("GPL v2");
MODULE_DEVICE_TABLE(of, ns_pinctrl_of_match_table);
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