--- /dev/null
+/*
+ * 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;
+}
Code Review / kvmfornfv.git / blobdiff