diff options
Diffstat (limited to 'drivers/pinctrl/freescale/pinctrl-mxs.c')
-rw-r--r-- | drivers/pinctrl/freescale/pinctrl-mxs.c | 541 |
1 files changed, 541 insertions, 0 deletions
diff --git a/drivers/pinctrl/freescale/pinctrl-mxs.c b/drivers/pinctrl/freescale/pinctrl-mxs.c new file mode 100644 index 0000000..f98c6bb --- /dev/null +++ b/drivers/pinctrl/freescale/pinctrl-mxs.c @@ -0,0 +1,541 @@ +/* + * Copyright 2012 Freescale Semiconductor, Inc. + * + * The code contained herein is licensed under the GNU General Public + * License. You may obtain a copy of the GNU General Public License + * Version 2 or later at the following locations: + * + * http://www.opensource.org/licenses/gpl-license.html + * http://www.gnu.org/copyleft/gpl.html + */ + +#include <linux/err.h> +#include <linux/init.h> +#include <linux/io.h> +#include <linux/module.h> +#include <linux/of.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/platform_device.h> +#include <linux/slab.h> +#include "../core.h" +#include "pinctrl-mxs.h" + +#define SUFFIX_LEN 4 + +struct mxs_pinctrl_data { + struct device *dev; + struct pinctrl_dev *pctl; + void __iomem *base; + struct mxs_pinctrl_soc_data *soc; +}; + +static int mxs_get_groups_count(struct pinctrl_dev *pctldev) +{ + struct mxs_pinctrl_data *d = pinctrl_dev_get_drvdata(pctldev); + + return d->soc->ngroups; +} + +static const char *mxs_get_group_name(struct pinctrl_dev *pctldev, + unsigned group) +{ + struct mxs_pinctrl_data *d = pinctrl_dev_get_drvdata(pctldev); + + return d->soc->groups[group].name; +} + +static int mxs_get_group_pins(struct pinctrl_dev *pctldev, unsigned group, + const unsigned **pins, unsigned *num_pins) +{ + struct mxs_pinctrl_data *d = pinctrl_dev_get_drvdata(pctldev); + + *pins = d->soc->groups[group].pins; + *num_pins = d->soc->groups[group].npins; + + return 0; +} + +static void mxs_pin_dbg_show(struct pinctrl_dev *pctldev, struct seq_file *s, + unsigned offset) +{ + seq_printf(s, " %s", dev_name(pctldev->dev)); +} + +static int mxs_dt_node_to_map(struct pinctrl_dev *pctldev, + struct device_node *np, + struct pinctrl_map **map, unsigned *num_maps) +{ + struct pinctrl_map *new_map; + char *group = NULL; + unsigned new_num = 1; + unsigned long config = 0; + unsigned long *pconfig; + int length = strlen(np->name) + SUFFIX_LEN; + bool purecfg = false; + u32 val, reg; + int ret, i = 0; + + /* Check for pin config node which has no 'reg' property */ + if (of_property_read_u32(np, "reg", ®)) + purecfg = true; + + ret = of_property_read_u32(np, "fsl,drive-strength", &val); + if (!ret) + config = val | MA_PRESENT; + ret = of_property_read_u32(np, "fsl,voltage", &val); + if (!ret) + config |= val << VOL_SHIFT | VOL_PRESENT; + ret = of_property_read_u32(np, "fsl,pull-up", &val); + if (!ret) + config |= val << PULL_SHIFT | PULL_PRESENT; + + /* Check for group node which has both mux and config settings */ + if (!purecfg && config) + new_num = 2; + + new_map = kzalloc(sizeof(*new_map) * new_num, GFP_KERNEL); + if (!new_map) + return -ENOMEM; + + if (!purecfg) { + new_map[i].type = PIN_MAP_TYPE_MUX_GROUP; + new_map[i].data.mux.function = np->name; + + /* Compose group name */ + group = kzalloc(length, GFP_KERNEL); + if (!group) { + ret = -ENOMEM; + goto free; + } + snprintf(group, length, "%s.%d", np->name, reg); + new_map[i].data.mux.group = group; + i++; + } + + if (config) { + pconfig = kmemdup(&config, sizeof(config), GFP_KERNEL); + if (!pconfig) { + ret = -ENOMEM; + goto free_group; + } + + new_map[i].type = PIN_MAP_TYPE_CONFIGS_GROUP; + new_map[i].data.configs.group_or_pin = purecfg ? np->name : + group; + new_map[i].data.configs.configs = pconfig; + new_map[i].data.configs.num_configs = 1; + } + + *map = new_map; + *num_maps = new_num; + + return 0; + +free_group: + if (!purecfg) + kfree(group); +free: + kfree(new_map); + return ret; +} + +static void mxs_dt_free_map(struct pinctrl_dev *pctldev, + struct pinctrl_map *map, unsigned num_maps) +{ + u32 i; + + for (i = 0; i < num_maps; i++) { + if (map[i].type == PIN_MAP_TYPE_MUX_GROUP) + kfree(map[i].data.mux.group); + if (map[i].type == PIN_MAP_TYPE_CONFIGS_GROUP) + kfree(map[i].data.configs.configs); + } + + kfree(map); +} + +static const struct pinctrl_ops mxs_pinctrl_ops = { + .get_groups_count = mxs_get_groups_count, + .get_group_name = mxs_get_group_name, + .get_group_pins = mxs_get_group_pins, + .pin_dbg_show = mxs_pin_dbg_show, + .dt_node_to_map = mxs_dt_node_to_map, + .dt_free_map = mxs_dt_free_map, +}; + +static int mxs_pinctrl_get_funcs_count(struct pinctrl_dev *pctldev) +{ + struct mxs_pinctrl_data *d = pinctrl_dev_get_drvdata(pctldev); + + return d->soc->nfunctions; +} + +static const char *mxs_pinctrl_get_func_name(struct pinctrl_dev *pctldev, + unsigned function) +{ + struct mxs_pinctrl_data *d = pinctrl_dev_get_drvdata(pctldev); + + return d->soc->functions[function].name; +} + +static int mxs_pinctrl_get_func_groups(struct pinctrl_dev *pctldev, + unsigned group, + const char * const **groups, + unsigned * const num_groups) +{ + struct mxs_pinctrl_data *d = pinctrl_dev_get_drvdata(pctldev); + + *groups = d->soc->functions[group].groups; + *num_groups = d->soc->functions[group].ngroups; + + return 0; +} + +static int mxs_pinctrl_set_mux(struct pinctrl_dev *pctldev, unsigned selector, + unsigned group) +{ + struct mxs_pinctrl_data *d = pinctrl_dev_get_drvdata(pctldev); + struct mxs_group *g = &d->soc->groups[group]; + void __iomem *reg; + u8 bank, shift; + u16 pin; + u32 i; + + for (i = 0; i < g->npins; i++) { + bank = PINID_TO_BANK(g->pins[i]); + pin = PINID_TO_PIN(g->pins[i]); + reg = d->base + d->soc->regs->muxsel; + reg += bank * 0x20 + pin / 16 * 0x10; + shift = pin % 16 * 2; + + writel(0x3 << shift, reg + CLR); + writel(g->muxsel[i] << shift, reg + SET); + } + + return 0; +} + +static const struct pinmux_ops mxs_pinmux_ops = { + .get_functions_count = mxs_pinctrl_get_funcs_count, + .get_function_name = mxs_pinctrl_get_func_name, + .get_function_groups = mxs_pinctrl_get_func_groups, + .set_mux = mxs_pinctrl_set_mux, +}; + +static int mxs_pinconf_get(struct pinctrl_dev *pctldev, + unsigned pin, unsigned long *config) +{ + return -ENOTSUPP; +} + +static int mxs_pinconf_set(struct pinctrl_dev *pctldev, + unsigned pin, unsigned long *configs, + unsigned num_configs) +{ + return -ENOTSUPP; +} + +static int mxs_pinconf_group_get(struct pinctrl_dev *pctldev, + unsigned group, unsigned long *config) +{ + struct mxs_pinctrl_data *d = pinctrl_dev_get_drvdata(pctldev); + + *config = d->soc->groups[group].config; + + return 0; +} + +static int mxs_pinconf_group_set(struct pinctrl_dev *pctldev, + unsigned group, unsigned long *configs, + unsigned num_configs) +{ + struct mxs_pinctrl_data *d = pinctrl_dev_get_drvdata(pctldev); + struct mxs_group *g = &d->soc->groups[group]; + void __iomem *reg; + u8 ma, vol, pull, bank, shift; + u16 pin; + u32 i; + int n; + unsigned long config; + + for (n = 0; n < num_configs; n++) { + config = configs[n]; + + ma = CONFIG_TO_MA(config); + vol = CONFIG_TO_VOL(config); + pull = CONFIG_TO_PULL(config); + + for (i = 0; i < g->npins; i++) { + bank = PINID_TO_BANK(g->pins[i]); + pin = PINID_TO_PIN(g->pins[i]); + + /* drive */ + reg = d->base + d->soc->regs->drive; + reg += bank * 0x40 + pin / 8 * 0x10; + + /* mA */ + if (config & MA_PRESENT) { + shift = pin % 8 * 4; + writel(0x3 << shift, reg + CLR); + writel(ma << shift, reg + SET); + } + + /* vol */ + if (config & VOL_PRESENT) { + shift = pin % 8 * 4 + 2; + if (vol) + writel(1 << shift, reg + SET); + else + writel(1 << shift, reg + CLR); + } + + /* pull */ + if (config & PULL_PRESENT) { + reg = d->base + d->soc->regs->pull; + reg += bank * 0x10; + shift = pin; + if (pull) + writel(1 << shift, reg + SET); + else + writel(1 << shift, reg + CLR); + } + } + + /* cache the config value for mxs_pinconf_group_get() */ + g->config = config; + + } /* for each config */ + + return 0; +} + +static void mxs_pinconf_dbg_show(struct pinctrl_dev *pctldev, + struct seq_file *s, unsigned pin) +{ + /* Not support */ +} + +static void mxs_pinconf_group_dbg_show(struct pinctrl_dev *pctldev, + struct seq_file *s, unsigned group) +{ + unsigned long config; + + if (!mxs_pinconf_group_get(pctldev, group, &config)) + seq_printf(s, "0x%lx", config); +} + +static const struct pinconf_ops mxs_pinconf_ops = { + .pin_config_get = mxs_pinconf_get, + .pin_config_set = mxs_pinconf_set, + .pin_config_group_get = mxs_pinconf_group_get, + .pin_config_group_set = mxs_pinconf_group_set, + .pin_config_dbg_show = mxs_pinconf_dbg_show, + .pin_config_group_dbg_show = mxs_pinconf_group_dbg_show, +}; + +static struct pinctrl_desc mxs_pinctrl_desc = { + .pctlops = &mxs_pinctrl_ops, + .pmxops = &mxs_pinmux_ops, + .confops = &mxs_pinconf_ops, + .owner = THIS_MODULE, +}; + +static int mxs_pinctrl_parse_group(struct platform_device *pdev, + struct device_node *np, int idx, + const char **out_name) +{ + struct mxs_pinctrl_data *d = platform_get_drvdata(pdev); + struct mxs_group *g = &d->soc->groups[idx]; + struct property *prop; + const char *propname = "fsl,pinmux-ids"; + char *group; + int length = strlen(np->name) + SUFFIX_LEN; + u32 val, i; + + group = devm_kzalloc(&pdev->dev, length, GFP_KERNEL); + if (!group) + return -ENOMEM; + if (of_property_read_u32(np, "reg", &val)) + snprintf(group, length, "%s", np->name); + else + snprintf(group, length, "%s.%d", np->name, val); + g->name = group; + + prop = of_find_property(np, propname, &length); + if (!prop) + return -EINVAL; + g->npins = length / sizeof(u32); + + g->pins = devm_kzalloc(&pdev->dev, g->npins * sizeof(*g->pins), + GFP_KERNEL); + if (!g->pins) + return -ENOMEM; + + g->muxsel = devm_kzalloc(&pdev->dev, g->npins * sizeof(*g->muxsel), + GFP_KERNEL); + if (!g->muxsel) + return -ENOMEM; + + of_property_read_u32_array(np, propname, g->pins, g->npins); + for (i = 0; i < g->npins; i++) { + g->muxsel[i] = MUXID_TO_MUXSEL(g->pins[i]); + g->pins[i] = MUXID_TO_PINID(g->pins[i]); + } + + if (out_name) + *out_name = g->name; + + return 0; +} + +static int mxs_pinctrl_probe_dt(struct platform_device *pdev, + struct mxs_pinctrl_data *d) +{ + struct mxs_pinctrl_soc_data *soc = d->soc; + struct device_node *np = pdev->dev.of_node; + struct device_node *child; + struct mxs_function *f; + const char *gpio_compat = "fsl,mxs-gpio"; + const char *fn, *fnull = ""; + int i = 0, idxf = 0, idxg = 0; + int ret; + u32 val; + + child = of_get_next_child(np, NULL); + if (!child) { + dev_err(&pdev->dev, "no group is defined\n"); + return -ENOENT; + } + + /* Count total functions and groups */ + fn = fnull; + for_each_child_of_node(np, child) { + if (of_device_is_compatible(child, gpio_compat)) + continue; + soc->ngroups++; + /* Skip pure pinconf node */ + if (of_property_read_u32(child, "reg", &val)) + continue; + if (strcmp(fn, child->name)) { + fn = child->name; + soc->nfunctions++; + } + } + + soc->functions = devm_kzalloc(&pdev->dev, soc->nfunctions * + sizeof(*soc->functions), GFP_KERNEL); + if (!soc->functions) + return -ENOMEM; + + soc->groups = devm_kzalloc(&pdev->dev, soc->ngroups * + sizeof(*soc->groups), GFP_KERNEL); + if (!soc->groups) + return -ENOMEM; + + /* Count groups for each function */ + fn = fnull; + f = &soc->functions[idxf]; + for_each_child_of_node(np, child) { + if (of_device_is_compatible(child, gpio_compat)) + continue; + if (of_property_read_u32(child, "reg", &val)) + continue; + if (strcmp(fn, child->name)) { + f = &soc->functions[idxf++]; + f->name = fn = child->name; + } + f->ngroups++; + }; + + /* Get groups for each function */ + idxf = 0; + fn = fnull; + for_each_child_of_node(np, child) { + if (of_device_is_compatible(child, gpio_compat)) + continue; + if (of_property_read_u32(child, "reg", &val)) { + ret = mxs_pinctrl_parse_group(pdev, child, + idxg++, NULL); + if (ret) + return ret; + continue; + } + + if (strcmp(fn, child->name)) { + f = &soc->functions[idxf++]; + f->groups = devm_kzalloc(&pdev->dev, f->ngroups * + sizeof(*f->groups), + GFP_KERNEL); + if (!f->groups) + return -ENOMEM; + fn = child->name; + i = 0; + } + ret = mxs_pinctrl_parse_group(pdev, child, idxg++, + &f->groups[i++]); + if (ret) + return ret; + } + + return 0; +} + +int mxs_pinctrl_probe(struct platform_device *pdev, + struct mxs_pinctrl_soc_data *soc) +{ + struct device_node *np = pdev->dev.of_node; + struct mxs_pinctrl_data *d; + int ret; + + d = devm_kzalloc(&pdev->dev, sizeof(*d), GFP_KERNEL); + if (!d) + return -ENOMEM; + + d->dev = &pdev->dev; + d->soc = soc; + + d->base = of_iomap(np, 0); + if (!d->base) + return -EADDRNOTAVAIL; + + mxs_pinctrl_desc.pins = d->soc->pins; + mxs_pinctrl_desc.npins = d->soc->npins; + mxs_pinctrl_desc.name = dev_name(&pdev->dev); + + platform_set_drvdata(pdev, d); + + ret = mxs_pinctrl_probe_dt(pdev, d); + if (ret) { + dev_err(&pdev->dev, "dt probe failed: %d\n", ret); + goto err; + } + + d->pctl = pinctrl_register(&mxs_pinctrl_desc, &pdev->dev, d); + if (!d->pctl) { + dev_err(&pdev->dev, "Couldn't register MXS pinctrl driver\n"); + ret = -EINVAL; + goto err; + } + + return 0; + +err: + iounmap(d->base); + return ret; +} +EXPORT_SYMBOL_GPL(mxs_pinctrl_probe); + +int mxs_pinctrl_remove(struct platform_device *pdev) +{ + struct mxs_pinctrl_data *d = platform_get_drvdata(pdev); + + pinctrl_unregister(d->pctl); + iounmap(d->base); + + return 0; +} +EXPORT_SYMBOL_GPL(mxs_pinctrl_remove); |