/* * 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/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 = 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 resource *res; struct spear_pmx *pmx; if (!machdata) return -ENODEV; pmx = devm_kzalloc(&pdev->dev, sizeof(*pmx), GFP_KERNEL); if (!pmx) 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 = 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; }