diff options
Diffstat (limited to 'drivers/pinctrl/spear/pinctrl-spear.c')
| -rw-r--r-- | drivers/pinctrl/spear/pinctrl-spear.c | 414 |
1 files changed, 414 insertions, 0 deletions
diff --git a/drivers/pinctrl/spear/pinctrl-spear.c b/drivers/pinctrl/spear/pinctrl-spear.c new file mode 100644 index 000000000..abdb05ac4 --- /dev/null +++ b/drivers/pinctrl/spear/pinctrl-spear.c @@ -0,0 +1,414 @@ +/* + * Driver for the ST Microelectronics SPEAr pinmux + * + * Copyright (C) 2012 ST Microelectronics + * Viresh Kumar <viresh.linux@gmail.com> + * + * Inspired from: + * - U300 Pinctl drivers + * - Tegra Pinctl drivers + * + * 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/err.h> +#include <linux/module.h> +#include <linux/of.h> +#include <linux/of_address.h> +#include <linux/of_gpio.h> +#include <linux/pinctrl/machine.h> +#include <linux/pinctrl/pinctrl.h> +#include <linux/pinctrl/pinmux.h> +#include <linux/platform_device.h> +#include <linux/slab.h> + +#include "pinctrl-spear.h" + +#define DRIVER_NAME "spear-pinmux" + +static void muxregs_endisable(struct spear_pmx *pmx, + struct spear_muxreg *muxregs, u8 count, bool enable) +{ + struct spear_muxreg *muxreg; + u32 val, temp, j; + + for (j = 0; j < count; j++) { + muxreg = &muxregs[j]; + + val = pmx_readl(pmx, muxreg->reg); + val &= ~muxreg->mask; + + if (enable) + temp = muxreg->val; + else + temp = ~muxreg->val; + + val |= muxreg->mask & temp; + pmx_writel(pmx, val, muxreg->reg); + } +} + +static int set_mode(struct spear_pmx *pmx, int mode) +{ + struct spear_pmx_mode *pmx_mode = NULL; + int i; + u32 val; + + if (!pmx->machdata->pmx_modes || !pmx->machdata->npmx_modes) + return -EINVAL; + + for (i = 0; i < pmx->machdata->npmx_modes; i++) { + if (pmx->machdata->pmx_modes[i]->mode == (1 << mode)) { + pmx_mode = pmx->machdata->pmx_modes[i]; + break; + } + } + + if (!pmx_mode) + return -EINVAL; + + val = pmx_readl(pmx, pmx_mode->reg); + val &= ~pmx_mode->mask; + val |= pmx_mode->val; + pmx_writel(pmx, val, pmx_mode->reg); + + pmx->machdata->mode = pmx_mode->mode; + dev_info(pmx->dev, "Configured Mode: %s with id: %x\n\n", + pmx_mode->name ? pmx_mode->name : "no_name", + pmx_mode->reg); + + return 0; +} + +void pmx_init_gpio_pingroup_addr(struct spear_gpio_pingroup *gpio_pingroup, + unsigned count, u16 reg) +{ + int i, j; + + for (i = 0; i < count; i++) + for (j = 0; j < gpio_pingroup[i].nmuxregs; j++) + gpio_pingroup[i].muxregs[j].reg = reg; +} + +void pmx_init_addr(struct spear_pinctrl_machdata *machdata, u16 reg) +{ + struct spear_pingroup *pgroup; + struct spear_modemux *modemux; + int i, j, group; + + for (group = 0; group < machdata->ngroups; group++) { + pgroup = machdata->groups[group]; + + for (i = 0; i < pgroup->nmodemuxs; i++) { + modemux = &pgroup->modemuxs[i]; + + for (j = 0; j < modemux->nmuxregs; j++) + if (modemux->muxregs[j].reg == 0xFFFF) + modemux->muxregs[j].reg = reg; + } + } +} + +static int spear_pinctrl_get_groups_cnt(struct pinctrl_dev *pctldev) +{ + struct spear_pmx *pmx = pinctrl_dev_get_drvdata(pctldev); + + return pmx->machdata->ngroups; +} + +static const char *spear_pinctrl_get_group_name(struct pinctrl_dev *pctldev, + unsigned group) +{ + struct spear_pmx *pmx = pinctrl_dev_get_drvdata(pctldev); + + return pmx->machdata->groups[group]->name; +} + +static int spear_pinctrl_get_group_pins(struct pinctrl_dev *pctldev, + unsigned group, const unsigned **pins, unsigned *num_pins) +{ + struct spear_pmx *pmx = pinctrl_dev_get_drvdata(pctldev); + + *pins = pmx->machdata->groups[group]->pins; + *num_pins = pmx->machdata->groups[group]->npins; + + return 0; +} + +static void spear_pinctrl_pin_dbg_show(struct pinctrl_dev *pctldev, + struct seq_file *s, unsigned offset) +{ + seq_printf(s, " " DRIVER_NAME); +} + +static int spear_pinctrl_dt_node_to_map(struct pinctrl_dev *pctldev, + struct device_node *np_config, + struct pinctrl_map **map, + unsigned *num_maps) +{ + struct spear_pmx *pmx = pinctrl_dev_get_drvdata(pctldev); + struct device_node *np; + struct property *prop; + const char *function, *group; + int ret, index = 0, count = 0; + + /* calculate number of maps required */ + for_each_child_of_node(np_config, np) { + ret = of_property_read_string(np, "st,function", &function); + if (ret < 0) + return ret; + + ret = of_property_count_strings(np, "st,pins"); + if (ret < 0) + return ret; + + count += ret; + } + + if (!count) { + dev_err(pmx->dev, "No child nodes passed via DT\n"); + return -ENODEV; + } + + *map = kzalloc(sizeof(**map) * count, GFP_KERNEL); + if (!*map) + return -ENOMEM; + + for_each_child_of_node(np_config, np) { + of_property_read_string(np, "st,function", &function); + of_property_for_each_string(np, "st,pins", prop, group) { + (*map)[index].type = PIN_MAP_TYPE_MUX_GROUP; + (*map)[index].data.mux.group = group; + (*map)[index].data.mux.function = function; + index++; + } + } + + *num_maps = count; + + return 0; +} + +static void spear_pinctrl_dt_free_map(struct pinctrl_dev *pctldev, + struct pinctrl_map *map, + unsigned num_maps) +{ + kfree(map); +} + +static const struct pinctrl_ops spear_pinctrl_ops = { + .get_groups_count = spear_pinctrl_get_groups_cnt, + .get_group_name = spear_pinctrl_get_group_name, + .get_group_pins = spear_pinctrl_get_group_pins, + .pin_dbg_show = spear_pinctrl_pin_dbg_show, + .dt_node_to_map = spear_pinctrl_dt_node_to_map, + .dt_free_map = spear_pinctrl_dt_free_map, +}; + +static int spear_pinctrl_get_funcs_count(struct pinctrl_dev *pctldev) +{ + struct spear_pmx *pmx = pinctrl_dev_get_drvdata(pctldev); + + return pmx->machdata->nfunctions; +} + +static const char *spear_pinctrl_get_func_name(struct pinctrl_dev *pctldev, + unsigned function) +{ + struct spear_pmx *pmx = pinctrl_dev_get_drvdata(pctldev); + + return pmx->machdata->functions[function]->name; +} + +static int spear_pinctrl_get_func_groups(struct pinctrl_dev *pctldev, + unsigned function, const char *const **groups, + unsigned * const ngroups) +{ + struct spear_pmx *pmx = pinctrl_dev_get_drvdata(pctldev); + + *groups = pmx->machdata->functions[function]->groups; + *ngroups = pmx->machdata->functions[function]->ngroups; + + return 0; +} + +static int spear_pinctrl_endisable(struct pinctrl_dev *pctldev, + unsigned function, unsigned group, bool enable) +{ + struct spear_pmx *pmx = pinctrl_dev_get_drvdata(pctldev); + const struct spear_pingroup *pgroup; + const struct spear_modemux *modemux; + int i; + bool found = false; + + pgroup = pmx->machdata->groups[group]; + + for (i = 0; i < pgroup->nmodemuxs; i++) { + modemux = &pgroup->modemuxs[i]; + + /* SoC have any modes */ + if (pmx->machdata->modes_supported) { + if (!(pmx->machdata->mode & modemux->modes)) + continue; + } + + found = true; + muxregs_endisable(pmx, modemux->muxregs, modemux->nmuxregs, + enable); + } + + if (!found) { + dev_err(pmx->dev, "pinmux group: %s not supported\n", + pgroup->name); + return -ENODEV; + } + + return 0; +} + +static int spear_pinctrl_set_mux(struct pinctrl_dev *pctldev, unsigned function, + unsigned group) +{ + return spear_pinctrl_endisable(pctldev, function, group, true); +} + +/* gpio with pinmux */ +static struct spear_gpio_pingroup *get_gpio_pingroup(struct spear_pmx *pmx, + unsigned pin) +{ + struct spear_gpio_pingroup *gpio_pingroup; + int i, j; + + if (!pmx->machdata->gpio_pingroups) + return NULL; + + for (i = 0; i < pmx->machdata->ngpio_pingroups; i++) { + gpio_pingroup = &pmx->machdata->gpio_pingroups[i]; + + for (j = 0; j < gpio_pingroup->npins; j++) { + if (gpio_pingroup->pins[j] == pin) + return gpio_pingroup; + } + } + + return NULL; +} + +static int gpio_request_endisable(struct pinctrl_dev *pctldev, + struct pinctrl_gpio_range *range, unsigned offset, bool enable) +{ + struct spear_pmx *pmx = pinctrl_dev_get_drvdata(pctldev); + struct spear_pinctrl_machdata *machdata = pmx->machdata; + struct spear_gpio_pingroup *gpio_pingroup; + + /* + * Some SoC have configuration options applicable to group of pins, + * rather than a single pin. + */ + gpio_pingroup = get_gpio_pingroup(pmx, offset); + if (gpio_pingroup) + muxregs_endisable(pmx, gpio_pingroup->muxregs, + gpio_pingroup->nmuxregs, enable); + + /* + * SoC may need some extra configurations, or configurations for single + * pin + */ + if (machdata->gpio_request_endisable) + machdata->gpio_request_endisable(pmx, offset, enable); + + return 0; +} + +static int gpio_request_enable(struct pinctrl_dev *pctldev, + struct pinctrl_gpio_range *range, unsigned offset) +{ + return gpio_request_endisable(pctldev, range, offset, true); +} + +static void gpio_disable_free(struct pinctrl_dev *pctldev, + struct pinctrl_gpio_range *range, unsigned offset) +{ + gpio_request_endisable(pctldev, range, offset, false); +} + +static const struct pinmux_ops spear_pinmux_ops = { + .get_functions_count = spear_pinctrl_get_funcs_count, + .get_function_name = spear_pinctrl_get_func_name, + .get_function_groups = spear_pinctrl_get_func_groups, + .set_mux = spear_pinctrl_set_mux, + .gpio_request_enable = gpio_request_enable, + .gpio_disable_free = gpio_disable_free, +}; + +static struct pinctrl_desc spear_pinctrl_desc = { + .name = DRIVER_NAME, + .pctlops = &spear_pinctrl_ops, + .pmxops = &spear_pinmux_ops, + .owner = THIS_MODULE, +}; + +int spear_pinctrl_probe(struct platform_device *pdev, + struct spear_pinctrl_machdata *machdata) +{ + struct device_node *np = pdev->dev.of_node; + struct resource *res; + struct spear_pmx *pmx; + + if (!machdata) + return -ENODEV; + + pmx = devm_kzalloc(&pdev->dev, sizeof(*pmx), GFP_KERNEL); + if (!pmx) { + dev_err(&pdev->dev, "Can't alloc spear_pmx\n"); + return -ENOMEM; + } + + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + pmx->vbase = devm_ioremap_resource(&pdev->dev, res); + if (IS_ERR(pmx->vbase)) + return PTR_ERR(pmx->vbase); + + pmx->dev = &pdev->dev; + pmx->machdata = machdata; + + /* configure mode, if supported by SoC */ + if (machdata->modes_supported) { + int mode = 0; + + if (of_property_read_u32(np, "st,pinmux-mode", &mode)) { + dev_err(&pdev->dev, "OF: pinmux mode not passed\n"); + return -EINVAL; + } + + if (set_mode(pmx, mode)) { + dev_err(&pdev->dev, "OF: Couldn't configure mode: %x\n", + mode); + return -EINVAL; + } + } + + platform_set_drvdata(pdev, pmx); + + spear_pinctrl_desc.pins = machdata->pins; + spear_pinctrl_desc.npins = machdata->npins; + + pmx->pctl = pinctrl_register(&spear_pinctrl_desc, &pdev->dev, pmx); + if (!pmx->pctl) { + dev_err(&pdev->dev, "Couldn't register pinctrl driver\n"); + return -ENODEV; + } + + return 0; +} + +int spear_pinctrl_remove(struct platform_device *pdev) +{ + struct spear_pmx *pmx = platform_get_drvdata(pdev); + + pinctrl_unregister(pmx->pctl); + + return 0; +} |