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405 lines
9.7 KiB
405 lines
9.7 KiB
/* |
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* Driver for the ST Microelectronics SPEAr pinmux |
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* |
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* Copyright (C) 2012 ST Microelectronics |
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* Viresh Kumar <[email protected]> |
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* |
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* Inspired from: |
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* - U300 Pinctl drivers |
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* - Tegra Pinctl drivers |
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* |
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* This file is licensed under the terms of the GNU General Public |
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* License version 2. This program is licensed "as is" without any |
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* warranty of any kind, whether express or implied. |
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*/ |
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#include <linux/err.h> |
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#include <linux/module.h> |
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#include <linux/of.h> |
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#include <linux/of_address.h> |
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#include <linux/of_gpio.h> |
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#include <linux/pinctrl/machine.h> |
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#include <linux/pinctrl/pinctrl.h> |
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#include <linux/pinctrl/pinmux.h> |
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#include <linux/platform_device.h> |
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#include <linux/slab.h> |
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#include "pinctrl-spear.h" |
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#define DRIVER_NAME "spear-pinmux" |
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static void muxregs_endisable(struct spear_pmx *pmx, |
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struct spear_muxreg *muxregs, u8 count, bool enable) |
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{ |
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struct spear_muxreg *muxreg; |
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u32 val, temp, j; |
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for (j = 0; j < count; j++) { |
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muxreg = &muxregs[j]; |
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val = pmx_readl(pmx, muxreg->reg); |
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val &= ~muxreg->mask; |
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if (enable) |
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temp = muxreg->val; |
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else |
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temp = ~muxreg->val; |
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val |= muxreg->mask & temp; |
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pmx_writel(pmx, val, muxreg->reg); |
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} |
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} |
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static int set_mode(struct spear_pmx *pmx, int mode) |
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{ |
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struct spear_pmx_mode *pmx_mode = NULL; |
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int i; |
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u32 val; |
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if (!pmx->machdata->pmx_modes || !pmx->machdata->npmx_modes) |
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return -EINVAL; |
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for (i = 0; i < pmx->machdata->npmx_modes; i++) { |
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if (pmx->machdata->pmx_modes[i]->mode == (1 << mode)) { |
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pmx_mode = pmx->machdata->pmx_modes[i]; |
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break; |
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} |
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} |
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if (!pmx_mode) |
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return -EINVAL; |
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val = pmx_readl(pmx, pmx_mode->reg); |
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val &= ~pmx_mode->mask; |
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val |= pmx_mode->val; |
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pmx_writel(pmx, val, pmx_mode->reg); |
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pmx->machdata->mode = pmx_mode->mode; |
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dev_info(pmx->dev, "Configured Mode: %s with id: %x\n\n", |
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pmx_mode->name ? pmx_mode->name : "no_name", |
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pmx_mode->reg); |
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return 0; |
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} |
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void pmx_init_gpio_pingroup_addr(struct spear_gpio_pingroup *gpio_pingroup, |
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unsigned count, u16 reg) |
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{ |
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int i, j; |
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for (i = 0; i < count; i++) |
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for (j = 0; j < gpio_pingroup[i].nmuxregs; j++) |
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gpio_pingroup[i].muxregs[j].reg = reg; |
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} |
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void pmx_init_addr(struct spear_pinctrl_machdata *machdata, u16 reg) |
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{ |
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struct spear_pingroup *pgroup; |
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struct spear_modemux *modemux; |
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int i, j, group; |
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for (group = 0; group < machdata->ngroups; group++) { |
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pgroup = machdata->groups[group]; |
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for (i = 0; i < pgroup->nmodemuxs; i++) { |
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modemux = &pgroup->modemuxs[i]; |
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for (j = 0; j < modemux->nmuxregs; j++) |
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if (modemux->muxregs[j].reg == 0xFFFF) |
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modemux->muxregs[j].reg = reg; |
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} |
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} |
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} |
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static int spear_pinctrl_get_groups_cnt(struct pinctrl_dev *pctldev) |
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{ |
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struct spear_pmx *pmx = pinctrl_dev_get_drvdata(pctldev); |
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return pmx->machdata->ngroups; |
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} |
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static const char *spear_pinctrl_get_group_name(struct pinctrl_dev *pctldev, |
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unsigned group) |
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{ |
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struct spear_pmx *pmx = pinctrl_dev_get_drvdata(pctldev); |
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return pmx->machdata->groups[group]->name; |
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} |
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static int spear_pinctrl_get_group_pins(struct pinctrl_dev *pctldev, |
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unsigned group, const unsigned **pins, unsigned *num_pins) |
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{ |
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struct spear_pmx *pmx = pinctrl_dev_get_drvdata(pctldev); |
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*pins = pmx->machdata->groups[group]->pins; |
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*num_pins = pmx->machdata->groups[group]->npins; |
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return 0; |
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} |
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static void spear_pinctrl_pin_dbg_show(struct pinctrl_dev *pctldev, |
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struct seq_file *s, unsigned offset) |
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{ |
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seq_printf(s, " " DRIVER_NAME); |
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} |
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static int spear_pinctrl_dt_node_to_map(struct pinctrl_dev *pctldev, |
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struct device_node *np_config, |
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struct pinctrl_map **map, |
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unsigned *num_maps) |
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{ |
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struct spear_pmx *pmx = pinctrl_dev_get_drvdata(pctldev); |
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struct device_node *np; |
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struct property *prop; |
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const char *function, *group; |
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int ret, index = 0, count = 0; |
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/* calculate number of maps required */ |
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for_each_child_of_node(np_config, np) { |
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ret = of_property_read_string(np, "st,function", &function); |
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if (ret < 0) { |
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of_node_put(np); |
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return ret; |
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} |
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ret = of_property_count_strings(np, "st,pins"); |
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if (ret < 0) { |
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of_node_put(np); |
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return ret; |
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} |
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count += ret; |
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} |
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if (!count) { |
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dev_err(pmx->dev, "No child nodes passed via DT\n"); |
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return -ENODEV; |
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} |
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*map = kcalloc(count, sizeof(**map), GFP_KERNEL); |
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if (!*map) |
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return -ENOMEM; |
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for_each_child_of_node(np_config, np) { |
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of_property_read_string(np, "st,function", &function); |
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of_property_for_each_string(np, "st,pins", prop, group) { |
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(*map)[index].type = PIN_MAP_TYPE_MUX_GROUP; |
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(*map)[index].data.mux.group = group; |
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(*map)[index].data.mux.function = function; |
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index++; |
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} |
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} |
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*num_maps = count; |
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return 0; |
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} |
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static void spear_pinctrl_dt_free_map(struct pinctrl_dev *pctldev, |
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struct pinctrl_map *map, |
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unsigned num_maps) |
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{ |
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kfree(map); |
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} |
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static const struct pinctrl_ops spear_pinctrl_ops = { |
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.get_groups_count = spear_pinctrl_get_groups_cnt, |
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.get_group_name = spear_pinctrl_get_group_name, |
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.get_group_pins = spear_pinctrl_get_group_pins, |
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.pin_dbg_show = spear_pinctrl_pin_dbg_show, |
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.dt_node_to_map = spear_pinctrl_dt_node_to_map, |
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.dt_free_map = spear_pinctrl_dt_free_map, |
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}; |
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static int spear_pinctrl_get_funcs_count(struct pinctrl_dev *pctldev) |
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{ |
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struct spear_pmx *pmx = pinctrl_dev_get_drvdata(pctldev); |
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return pmx->machdata->nfunctions; |
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} |
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static const char *spear_pinctrl_get_func_name(struct pinctrl_dev *pctldev, |
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unsigned function) |
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{ |
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struct spear_pmx *pmx = pinctrl_dev_get_drvdata(pctldev); |
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return pmx->machdata->functions[function]->name; |
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} |
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static int spear_pinctrl_get_func_groups(struct pinctrl_dev *pctldev, |
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unsigned function, const char *const **groups, |
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unsigned * const ngroups) |
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{ |
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struct spear_pmx *pmx = pinctrl_dev_get_drvdata(pctldev); |
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*groups = pmx->machdata->functions[function]->groups; |
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*ngroups = pmx->machdata->functions[function]->ngroups; |
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return 0; |
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} |
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static int spear_pinctrl_endisable(struct pinctrl_dev *pctldev, |
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unsigned function, unsigned group, bool enable) |
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{ |
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struct spear_pmx *pmx = pinctrl_dev_get_drvdata(pctldev); |
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const struct spear_pingroup *pgroup; |
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const struct spear_modemux *modemux; |
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int i; |
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bool found = false; |
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pgroup = pmx->machdata->groups[group]; |
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for (i = 0; i < pgroup->nmodemuxs; i++) { |
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modemux = &pgroup->modemuxs[i]; |
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/* SoC have any modes */ |
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if (pmx->machdata->modes_supported) { |
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if (!(pmx->machdata->mode & modemux->modes)) |
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continue; |
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} |
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found = true; |
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muxregs_endisable(pmx, modemux->muxregs, modemux->nmuxregs, |
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enable); |
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} |
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if (!found) { |
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dev_err(pmx->dev, "pinmux group: %s not supported\n", |
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pgroup->name); |
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return -ENODEV; |
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} |
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return 0; |
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} |
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static int spear_pinctrl_set_mux(struct pinctrl_dev *pctldev, unsigned function, |
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unsigned group) |
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{ |
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return spear_pinctrl_endisable(pctldev, function, group, true); |
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} |
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/* gpio with pinmux */ |
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static struct spear_gpio_pingroup *get_gpio_pingroup(struct spear_pmx *pmx, |
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unsigned pin) |
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{ |
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struct spear_gpio_pingroup *gpio_pingroup; |
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int i, j; |
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if (!pmx->machdata->gpio_pingroups) |
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return NULL; |
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for (i = 0; i < pmx->machdata->ngpio_pingroups; i++) { |
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gpio_pingroup = &pmx->machdata->gpio_pingroups[i]; |
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for (j = 0; j < gpio_pingroup->npins; j++) { |
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if (gpio_pingroup->pins[j] == pin) |
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return gpio_pingroup; |
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} |
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} |
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return NULL; |
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} |
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static int gpio_request_endisable(struct pinctrl_dev *pctldev, |
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struct pinctrl_gpio_range *range, unsigned offset, bool enable) |
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{ |
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struct spear_pmx *pmx = pinctrl_dev_get_drvdata(pctldev); |
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struct spear_pinctrl_machdata *machdata = pmx->machdata; |
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struct spear_gpio_pingroup *gpio_pingroup; |
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/* |
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* Some SoC have configuration options applicable to group of pins, |
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* rather than a single pin. |
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*/ |
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gpio_pingroup = get_gpio_pingroup(pmx, offset); |
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if (gpio_pingroup) |
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muxregs_endisable(pmx, gpio_pingroup->muxregs, |
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gpio_pingroup->nmuxregs, enable); |
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/* |
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* SoC may need some extra configurations, or configurations for single |
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* pin |
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*/ |
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if (machdata->gpio_request_endisable) |
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machdata->gpio_request_endisable(pmx, offset, enable); |
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return 0; |
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} |
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static int gpio_request_enable(struct pinctrl_dev *pctldev, |
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struct pinctrl_gpio_range *range, unsigned offset) |
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{ |
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return gpio_request_endisable(pctldev, range, offset, true); |
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} |
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static void gpio_disable_free(struct pinctrl_dev *pctldev, |
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struct pinctrl_gpio_range *range, unsigned offset) |
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{ |
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gpio_request_endisable(pctldev, range, offset, false); |
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} |
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static const struct pinmux_ops spear_pinmux_ops = { |
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.get_functions_count = spear_pinctrl_get_funcs_count, |
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.get_function_name = spear_pinctrl_get_func_name, |
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.get_function_groups = spear_pinctrl_get_func_groups, |
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.set_mux = spear_pinctrl_set_mux, |
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.gpio_request_enable = gpio_request_enable, |
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.gpio_disable_free = gpio_disable_free, |
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}; |
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static struct pinctrl_desc spear_pinctrl_desc = { |
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.name = DRIVER_NAME, |
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.pctlops = &spear_pinctrl_ops, |
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.pmxops = &spear_pinmux_ops, |
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.owner = THIS_MODULE, |
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}; |
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int spear_pinctrl_probe(struct platform_device *pdev, |
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struct spear_pinctrl_machdata *machdata) |
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{ |
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struct device_node *np = pdev->dev.of_node; |
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struct spear_pmx *pmx; |
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if (!machdata) |
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return -ENODEV; |
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pmx = devm_kzalloc(&pdev->dev, sizeof(*pmx), GFP_KERNEL); |
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if (!pmx) |
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return -ENOMEM; |
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pmx->vbase = devm_platform_ioremap_resource(pdev, 0); |
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if (IS_ERR(pmx->vbase)) |
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return PTR_ERR(pmx->vbase); |
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pmx->dev = &pdev->dev; |
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pmx->machdata = machdata; |
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/* configure mode, if supported by SoC */ |
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if (machdata->modes_supported) { |
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int mode = 0; |
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if (of_property_read_u32(np, "st,pinmux-mode", &mode)) { |
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dev_err(&pdev->dev, "OF: pinmux mode not passed\n"); |
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return -EINVAL; |
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} |
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if (set_mode(pmx, mode)) { |
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dev_err(&pdev->dev, "OF: Couldn't configure mode: %x\n", |
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mode); |
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return -EINVAL; |
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} |
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} |
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platform_set_drvdata(pdev, pmx); |
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spear_pinctrl_desc.pins = machdata->pins; |
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spear_pinctrl_desc.npins = machdata->npins; |
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pmx->pctl = devm_pinctrl_register(&pdev->dev, &spear_pinctrl_desc, pmx); |
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if (IS_ERR(pmx->pctl)) { |
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dev_err(&pdev->dev, "Couldn't register pinctrl driver\n"); |
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return PTR_ERR(pmx->pctl); |
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} |
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return 0; |
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}
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