| /* |
| * Driver for the ST Microelectronics SPEAr pinmux |
| * |
| * Copyright (C) 2012 ST Microelectronics |
| * Viresh Kumar <vireshk@kernel.org> |
| * |
| * 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/mfd/syscon.h> |
| #include <linux/module.h> |
| #include <linux/of.h> |
| #include <linux/of_address.h> |
| #include <linux/of_gpio.h> |
| #include <linux/platform_device.h> |
| #include <linux/seq_file.h> |
| #include <linux/slab.h> |
| |
| #include <linux/pinctrl/machine.h> |
| #include <linux/pinctrl/pinctrl.h> |
| #include <linux/pinctrl/pinmux.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) { |
| of_node_put(np); |
| return ret; |
| } |
| |
| ret = of_property_count_strings(np, "st,pins"); |
| if (ret < 0) { |
| of_node_put(np); |
| return ret; |
| } |
| |
| count += ret; |
| } |
| |
| if (!count) { |
| dev_err(pmx->dev, "No child nodes passed via DT\n"); |
| return -ENODEV; |
| } |
| |
| *map = kcalloc(count, sizeof(**map), 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 spear_pmx *pmx; |
| |
| if (!machdata) |
| return -ENODEV; |
| |
| pmx = devm_kzalloc(&pdev->dev, sizeof(*pmx), GFP_KERNEL); |
| if (!pmx) |
| return -ENOMEM; |
| |
| pmx->regmap = device_node_to_regmap(np); |
| if (IS_ERR(pmx->regmap)) { |
| dev_err(&pdev->dev, "Init regmap failed (%pe).\n", |
| pmx->regmap); |
| return PTR_ERR(pmx->regmap); |
| } |
| |
| 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 = devm_pinctrl_register(&pdev->dev, &spear_pinctrl_desc, pmx); |
| if (IS_ERR(pmx->pctl)) { |
| dev_err(&pdev->dev, "Couldn't register pinctrl driver\n"); |
| return PTR_ERR(pmx->pctl); |
| } |
| |
| return 0; |
| } |