[RFC PATCH 1/3] pinctrl: introduce driver for Atmel PIO4 controller
Ludovic Desroches
ludovic.desroches at atmel.com
Fri Jul 31 08:08:08 PDT 2015
Signed-off-by: Ludovic Desroches <ludovic.desroches at atmel.com>
---
drivers/pinctrl/pinctrl-at91-pio4.c | 959 ++++++++++++++++++++++++++++++++++++
1 file changed, 959 insertions(+)
create mode 100644 drivers/pinctrl/pinctrl-at91-pio4.c
diff --git a/drivers/pinctrl/pinctrl-at91-pio4.c b/drivers/pinctrl/pinctrl-at91-pio4.c
new file mode 100644
index 0000000..1cd3ef3
--- /dev/null
+++ b/drivers/pinctrl/pinctrl-at91-pio4.c
@@ -0,0 +1,959 @@
+/*
+ * Driver for the Atmel PIO4 controller
+ *
+ * Copyright (C) 2015 Atmel,
+ * 2015 Ludovic Desroches <ludovic.desroches at atmel.com>
+ *
+ * This software is licensed under the terms of the GNU General Public
+ * License version 2, as published by the Free Software Foundation, and
+ * may be copied, distributed, and modified under those terms.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+
+#include <asm/io.h>
+#include <linux/clk.h>
+#include <linux/gpio.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/pinctrl/pinconf.h>
+#include <linux/pinctrl/pinconf-generic.h>
+#include <linux/pinctrl/pinctrl.h>
+#include <linux/pinctrl/pinmux.h>
+#include <linux/slab.h>
+#include "core.h"
+#include "pinconf.h"
+#include "pinctrl-utils.h"
+
+/*
+ * Warning:
+ * In order to not introduce confusion between Atmel PIO groups and pinctrl
+ * framework groups, Atmel PIO groups will be called banks, line is kept to
+ * designed the pin id into this bank.
+ */
+
+#define ATMEL_PIO_MSKR 0x0000
+#define ATMEL_PIO_CFGR 0x0004
+#define ATMEL_PIO_CFGR_FUNC_MASK GENMASK(2, 0)
+#define ATMEL_PIO_DIR_MASK BIT(8)
+#define ATMEL_PIO_PUEN_MASK BIT(9)
+#define ATMEL_PIO_PDEN_MASK BIT(10)
+#define ATMEL_PIO_IFEN_MASK BIT(12)
+#define ATMEL_PIO_IFSCEN_MASK BIT(13)
+#define ATMEL_PIO_OPD_MASK BIT(14)
+#define ATMEL_PIO_SCHMITT_MASK BIT(15)
+#define ATMEL_PIO_CFGR_EVTSEL_MASK GENMASK(26,24)
+#define ATMEL_PIO_CFGR_EVTSEL_FALLING (0 << 24)
+#define ATMEL_PIO_CFGR_EVTSEL_RISING (1 << 24)
+#define ATMEL_PIO_CFGR_EVTSEL_BOTH (2 << 24)
+#define ATMEL_PIO_CFGR_EVTSEL_LOW (3 << 24)
+#define ATMEL_PIO_CFGR_EVTSEL_HIGH (4 << 24)
+#define ATMEL_PIO_PDSR 0x0008
+#define ATMEL_PIO_LOCKSR 0x000C
+#define ATMEL_PIO_SODR 0x0010
+#define ATMEL_PIO_CODR 0x0014
+#define ATMEL_PIO_ODSR 0x0018
+#define ATMEL_PIO_IER 0x0020
+#define ATMEL_PIO_IDR 0x0024
+#define ATMEL_PIO_IMR 0x0028
+#define ATMEL_PIO_ISR 0x002C
+#define ATMEL_PIO_IOFR 0x003C
+
+#define ATMEL_PIO_NPINS_PER_BANK 32
+#define ATMEL_PIO_BANK(pin_id) (pin_id / ATMEL_PIO_NPINS_PER_BANK)
+#define ATMEL_PIO_LINE(pin_id) (pin_id % ATMEL_PIO_NPINS_PER_BANK)
+#define ATMEL_PIO_BANK_OFFSET 0x40
+
+#define ATMEL_GET_PIN_NO(pinfunc) ((pinfunc) & 0xff)
+#define ATMEL_GET_PIN_FUNC(pinfunc) ((pinfunc >> 16) & 0xf)
+#define ATMEL_GET_PIN_IOSET(pinfunc) ((pinfunc >> 20) & 0xf)
+
+struct atmel_pioctrl_data {
+ unsigned nbanks;
+};
+
+struct atmel_group {
+ const char *name;
+ u32 pin;
+};
+
+struct atmel_pin {
+ unsigned pin_id;
+ unsigned mux;
+ unsigned ioset;
+ unsigned bank;
+ unsigned line;
+ const char *device;
+};
+
+/**
+ * struct atmel_pioctrl - Atmel PIO controller (pinmux + gpio)
+ * @reg_base: base address of the controller.
+ * @clk: clock of the controller.
+ * @nbanks: number of PIO groups, it can vary depending on the SoC.
+ * @pinctrl_dev: pinctrl device registered.
+ * @groups: groups table to provide group name and pin in the group to pinctrl.
+ * @group_names: group names table to provide all the group/pin names to
+ * pinctrl or gpio.
+ * @pins: pins table used for both pinctrl and gpio. pin_id, bank and line
+ * fields are set at probe time. Other ones are set when parsing dt
+ * pinctrl.
+ * @gpio_chip:
+ * @irq_domain:
+ * @irqs: table containing the hw irq number of the bank. The index of the
+ * table is the bank id.
+ */
+struct atmel_pioctrl {
+ void __iomem *reg_base;
+ struct clk *clk;
+ unsigned int nbanks;
+ struct pinctrl_dev *pinctrl_dev;
+ struct atmel_group *groups;
+ const char* const *group_names;
+ struct atmel_pin **pins;
+ unsigned int npins;
+ struct gpio_chip *gpio_chip;
+ struct irq_domain *irq_domain;
+ int *irqs;
+};
+
+static const char * const atmel_functions[] = {
+ "GPIO", "A", "B", "C", "D", "E", "F", "G"
+};
+
+/* --- GPIO --- */
+static unsigned int atmel_gpio_read(struct atmel_pioctrl *atmel_pioctrl, unsigned int bank, unsigned int reg)
+{
+ return readl_relaxed(atmel_pioctrl->reg_base + ATMEL_PIO_BANK_OFFSET * bank + reg);
+}
+
+static void atmel_gpio_write(struct atmel_pioctrl *atmel_pioctrl, unsigned int bank,
+ unsigned int reg, unsigned int val)
+{
+ writel_relaxed(val, atmel_pioctrl->reg_base + ATMEL_PIO_BANK_OFFSET * bank + reg);
+}
+
+static void atmel_gpio_irq_ack(struct irq_data *d)
+{
+
+}
+
+static int atmel_gpio_irq_set_type(struct irq_data *d, unsigned type)
+{
+ struct atmel_pioctrl *atmel_pioctrl = irq_data_get_irq_chip_data(d);
+ struct atmel_pin *pin = atmel_pioctrl->pins[d->hwirq];
+ unsigned int reg;
+
+ atmel_gpio_write(atmel_pioctrl, pin->bank, ATMEL_PIO_MSKR, BIT(pin->line));
+ reg = atmel_gpio_read(atmel_pioctrl, pin->bank, ATMEL_PIO_CFGR);
+ reg &= (~ATMEL_PIO_CFGR_EVTSEL_MASK);
+
+ switch (type) {
+ case IRQ_TYPE_EDGE_RISING:
+ __irq_set_handler_locked(d->irq, handle_edge_irq);
+ reg |= ATMEL_PIO_CFGR_EVTSEL_RISING;
+ break;
+ case IRQ_TYPE_EDGE_FALLING:
+ __irq_set_handler_locked(d->irq, handle_edge_irq);
+ reg |= ATMEL_PIO_CFGR_EVTSEL_FALLING;
+ break;
+ case IRQ_TYPE_EDGE_BOTH:
+ __irq_set_handler_locked(d->irq, handle_edge_irq);
+ reg |= ATMEL_PIO_CFGR_EVTSEL_BOTH;
+ break;
+ case IRQ_TYPE_LEVEL_LOW:
+ __irq_set_handler_locked(d->irq, handle_level_irq);
+ reg |= ATMEL_PIO_CFGR_EVTSEL_LOW;
+ break;
+ case IRQ_TYPE_LEVEL_HIGH:
+ __irq_set_handler_locked(d->irq, handle_level_irq);
+ reg |= ATMEL_PIO_CFGR_EVTSEL_HIGH;
+ break;
+ case IRQ_TYPE_NONE:
+ default:
+ return -EINVAL;
+ }
+
+ atmel_gpio_write(atmel_pioctrl, pin->bank, ATMEL_PIO_CFGR, reg);
+
+ return 0;
+}
+
+static void atmel_gpio_irq_mask(struct irq_data *d)
+{
+ struct atmel_pioctrl *atmel_pioctrl = irq_data_get_irq_chip_data(d);
+ struct atmel_pin *pin = atmel_pioctrl->pins[d->hwirq];
+
+ atmel_gpio_write(atmel_pioctrl, pin->bank, ATMEL_PIO_IDR, BIT(pin->line));
+}
+
+static void atmel_gpio_irq_unmask(struct irq_data *d)
+{
+ struct atmel_pioctrl *atmel_pioctrl = irq_data_get_irq_chip_data(d);
+ struct atmel_pin *pin = atmel_pioctrl->pins[d->hwirq];
+
+ atmel_gpio_write(atmel_pioctrl, pin->bank, ATMEL_PIO_IER, BIT(pin->line));
+}
+
+static struct irq_chip atmel_gpio_irq_chip = {
+ .name = "GPIO",
+ .irq_ack = atmel_gpio_irq_ack,
+ .irq_mask = atmel_gpio_irq_mask,
+ .irq_unmask = atmel_gpio_irq_unmask,
+ .irq_set_type = atmel_gpio_irq_set_type,
+};
+
+static void atmel_gpio_irq_handler(unsigned int irq, struct irq_desc *desc) {
+ struct irq_chip *chip = irq_desc_get_chip(desc);
+ struct atmel_pioctrl *atmel_pioctrl = irq_get_handler_data(irq);
+ unsigned long isr;
+ unsigned int bank;
+ int n;
+
+ for (n = 0; n < atmel_pioctrl->nbanks; n++) {
+ if (atmel_pioctrl->irqs[n] == irq) {
+ bank = n;
+ break;
+ }
+ }
+
+ chained_irq_enter(chip, desc);
+
+ for (;;) {
+ isr = (unsigned long) atmel_gpio_read(atmel_pioctrl, bank, ATMEL_PIO_ISR);
+ isr &= (unsigned long) atmel_gpio_read(atmel_pioctrl, bank, ATMEL_PIO_IMR);
+ if (!isr)
+ break;
+
+ for_each_set_bit(n, &isr, BITS_PER_LONG)
+ generic_handle_irq(gpio_to_irq(bank * ATMEL_PIO_NPINS_PER_BANK + n));
+ }
+
+ chained_irq_exit(chip, desc);
+}
+
+static int atmel_gpio_request(struct gpio_chip *chip, unsigned offset)
+{
+ return pinctrl_request_gpio(chip->base + offset);
+}
+
+static void atmel_gpio_free(struct gpio_chip *chip, unsigned offset)
+{
+ pinctrl_free_gpio(chip->base + offset);
+}
+
+static int atmel_gpio_direction_input(struct gpio_chip *chip, unsigned offset)
+{
+ return pinctrl_gpio_direction_input(chip->base + offset);
+}
+
+static int atmel_gpio_get(struct gpio_chip *chip, unsigned offset)
+{
+ struct atmel_pioctrl *atmel_pioctrl = dev_get_drvdata(chip->dev);
+ struct atmel_pin *pin = atmel_pioctrl->pins[offset];
+ unsigned int reg;
+
+ reg = atmel_gpio_read(atmel_pioctrl, pin->bank, ATMEL_PIO_PDSR);
+
+ return !!(reg & BIT(pin->line));
+}
+
+static int atmel_gpio_direction_output(struct gpio_chip *chip, unsigned offset)
+{
+ return pinctrl_gpio_direction_output(chip->base + offset);
+}
+
+static void atmel_gpio_set(struct gpio_chip *chip, unsigned offset, int val)
+{
+ struct atmel_pioctrl *atmel_pioctrl = dev_get_drvdata(chip->dev);
+ struct atmel_pin *pin = atmel_pioctrl->pins[offset];
+
+ atmel_gpio_write(atmel_pioctrl, pin->bank, val ? ATMEL_PIO_SODR : ATMEL_PIO_CODR,
+ BIT(pin->line));
+}
+
+static int atmel_gpio_to_irq(struct gpio_chip *chip, unsigned offset)
+{
+ struct atmel_pioctrl *atmel_pioctrl = dev_get_drvdata(chip->dev);
+
+ return irq_find_mapping(atmel_pioctrl->irq_domain, offset);
+}
+
+static struct gpio_chip atmel_gpio_chip = {
+ .request = atmel_gpio_request,
+ .free = atmel_gpio_free,
+ .direction_input = atmel_gpio_direction_input,
+ .get = atmel_gpio_get,
+ .direction_output = atmel_gpio_direction_output,
+ .set = atmel_gpio_set,
+ .to_irq = atmel_gpio_to_irq,
+ .base = 0,
+};
+
+/* --- PINCTRL --- */
+static unsigned int atmel_pin_config_read(struct pinctrl_dev *pctldev,
+ unsigned pin_id)
+{
+ struct atmel_pioctrl *atmel_pioctrl = pinctrl_dev_get_drvdata(pctldev);
+ unsigned bank = atmel_pioctrl->pins[pin_id]->bank;
+ unsigned line = atmel_pioctrl->pins[pin_id]->line;
+ void __iomem *addr = atmel_pioctrl->reg_base
+ + bank * ATMEL_PIO_BANK_OFFSET;
+
+ writel_relaxed(BIT(line), addr + ATMEL_PIO_MSKR);
+ wmb();
+
+ return readl_relaxed(addr + ATMEL_PIO_CFGR);
+}
+
+static void atmel_pin_config_write(struct pinctrl_dev *pctldev,
+ unsigned pin_id, u32 conf)
+{
+ struct atmel_pioctrl *atmel_pioctrl = pinctrl_dev_get_drvdata(pctldev);
+ unsigned bank = atmel_pioctrl->pins[pin_id]->bank;
+ unsigned line = atmel_pioctrl->pins[pin_id]->line;
+ void __iomem *addr = atmel_pioctrl->reg_base
+ + bank * ATMEL_PIO_BANK_OFFSET;
+
+ writel_relaxed(BIT(line), addr + ATMEL_PIO_MSKR);
+ wmb();
+ writel_relaxed(conf, addr + ATMEL_PIO_CFGR);
+}
+
+static int atmel_pctl_get_groups_count(struct pinctrl_dev *pctldev)
+{
+ struct atmel_pioctrl *atmel_pioctrl = pinctrl_dev_get_drvdata(pctldev);
+
+ return atmel_pioctrl->npins;
+}
+
+static const char *atmel_pctl_get_group_name(struct pinctrl_dev *pctldev,
+ unsigned selector)
+{
+ struct atmel_pioctrl *atmel_pioctrl = pinctrl_dev_get_drvdata(pctldev);
+
+ return atmel_pioctrl->groups[selector].name;
+}
+
+static int atmel_pctl_get_group_pins(struct pinctrl_dev *pctldev,
+ unsigned selector, const unsigned **pins,
+ unsigned *num_pins)
+{
+ struct atmel_pioctrl *atmel_pioctrl = pinctrl_dev_get_drvdata(pctldev);
+
+ *pins = (unsigned *)&atmel_pioctrl->groups[selector].pin;
+ *num_pins = 1;
+
+ return 0;
+}
+
+struct atmel_group *atmel_pctl_find_group_by_pin(struct pinctrl_dev *pctldev, unsigned pin)
+{
+ struct atmel_pioctrl *atmel_pioctrl = pinctrl_dev_get_drvdata(pctldev);
+ int i;
+
+ for (i = 0; i < atmel_pioctrl->npins; i++) {
+ struct atmel_group *grp = atmel_pioctrl->groups + i;
+
+ if (grp->pin == pin)
+ return grp;
+ }
+
+ return NULL;
+}
+
+static int atmel_pctl_xlate_pinfunc(struct pinctrl_dev *pctldev,
+ struct device_node *np,
+ u32 pinfunc, const char **grp_name,
+ const char **func_name)
+{
+ struct atmel_pioctrl *atmel_pioctrl = pinctrl_dev_get_drvdata(pctldev);
+ struct atmel_group *grp;
+ unsigned pin_id, func_id;
+
+ pin_id = ATMEL_GET_PIN_NO(pinfunc);
+ func_id = ATMEL_GET_PIN_FUNC(pinfunc);
+
+ if (func_id >= ARRAY_SIZE(atmel_functions))
+ return -EINVAL;
+
+ *func_name = atmel_functions[func_id];
+
+ grp = atmel_pctl_find_group_by_pin(pctldev, pin_id);
+ if (!grp)
+ return -EINVAL;
+ *grp_name = grp->name;
+
+ atmel_pioctrl->pins[pin_id]->mux = func_id;
+ atmel_pioctrl->pins[pin_id]->ioset = ATMEL_GET_PIN_IOSET(pinfunc);
+ atmel_pioctrl->pins[pin_id]->device = np->full_name;
+
+ return 0;
+}
+
+static int atmel_pctl_dt_subnode_to_map(struct pinctrl_dev *pctldev,
+ struct device_node *np,
+ struct pinctrl_map **map,
+ unsigned *reserved_maps,
+ unsigned *num_maps)
+{
+ struct property *pins;
+ int ret, i;
+ unsigned num_pins, reserve;
+ unsigned long *configs;
+ unsigned int num_configs;
+ bool has_config;
+ u32 pinfunc;
+
+ pins = of_find_property(np, "pinmux", NULL);
+ if (!pins)
+ return -EINVAL;
+
+ ret = pinconf_generic_parse_dt_config(np, pctldev, &configs,
+ &num_configs);
+ if (ret < 0) {
+ dev_err(pctldev->dev, "%s: could not parse node property\n",
+ of_node_full_name(np));
+ return ret;
+ }
+
+ if (num_configs)
+ has_config = true;
+
+ num_pins = pins->length / sizeof(u32);
+ if (!num_pins) {
+ dev_err(pctldev->dev, "no pins found in node %s\n",
+ of_node_full_name(np));
+ return -EINVAL;
+ }
+
+ /*
+ * Reserve maps, at least there is a mux map and an optionnal conf
+ * map for each pin.
+ */
+ reserve = 1;
+ if (has_config && num_pins >= 1)
+ reserve++;
+ reserve *= num_pins;
+ ret = pinctrl_utils_reserve_map(pctldev, map, reserved_maps, num_maps,
+ reserve);
+ if (ret < 0)
+ return ret;
+
+ for (i = 0; i < num_pins; i++) {
+ const char *group, *func;
+
+ ret = of_property_read_u32_index(np, "pinmux", i, &pinfunc);
+ if (ret)
+ return ret;
+
+ ret = atmel_pctl_xlate_pinfunc(pctldev, np, pinfunc, &group,
+ &func);
+ if (ret)
+ return ret;
+
+ pinctrl_utils_add_map_mux(pctldev, map, reserved_maps, num_maps,
+ group, func);
+
+ if (has_config) {
+ ret = pinctrl_utils_add_map_configs(pctldev, map,
+ reserved_maps, num_maps,
+ group, configs,
+ num_configs,
+ PIN_MAP_TYPE_CONFIGS_GROUP);
+ if (ret < 0)
+ return ret;
+ }
+ }
+
+ return 0;
+}
+
+static int atmel_pctl_dt_node_to_map(struct pinctrl_dev *pctldev,
+ struct device_node *np_config,
+ struct pinctrl_map **map,
+ unsigned *num_maps)
+{
+ struct device_node *np;
+ unsigned reserved_maps;
+ int ret;
+
+ *map = NULL;
+ *num_maps = 0;
+ reserved_maps = 0;
+
+ /*
+ * If all the pins of a device have the same configuration (or no one),
+ * it is useless to add a subnode, so directly parse node referenced by
+ * phandle.
+ */
+ ret = atmel_pctl_dt_subnode_to_map(pctldev, np_config, map,
+ &reserved_maps, num_maps);
+ if (ret) {
+ for_each_child_of_node(np_config, np) {
+ ret = atmel_pctl_dt_subnode_to_map(pctldev, np, map,
+ &reserved_maps, num_maps);
+ if (ret < 0)
+ break;
+ }
+ }
+
+ if (ret < 0) {
+ pinctrl_utils_dt_free_map(pctldev, *map, *num_maps);
+ dev_err(pctldev->dev, "can't create maps for node %s\n", np_config->full_name);
+ }
+
+ return ret;
+}
+
+static const struct pinctrl_ops atmel_pctlops = {
+ .get_groups_count = atmel_pctl_get_groups_count,
+ .get_group_name = atmel_pctl_get_group_name,
+ .get_group_pins = atmel_pctl_get_group_pins,
+ .dt_node_to_map = atmel_pctl_dt_node_to_map,
+ .dt_free_map = pinctrl_utils_dt_free_map,
+};
+
+static int atmel_pmx_get_functions_count(struct pinctrl_dev *pctldev)
+{
+ return ARRAY_SIZE(atmel_functions);
+}
+
+static const char *atmel_pmx_get_function_name(struct pinctrl_dev *pctldev,
+ unsigned selector)
+{
+ return atmel_functions[selector];
+}
+
+static int atmel_pmx_get_function_groups(struct pinctrl_dev *pctldev,
+ unsigned selector,
+ const char * const **groups,
+ unsigned * const num_groups)
+{
+ struct atmel_pioctrl *pctrl = pinctrl_dev_get_drvdata(pctldev);
+
+ *groups = pctrl->group_names;
+ *num_groups = pctrl->npins;
+
+ return 0;
+}
+
+static int atmel_pmx_set_mux(struct pinctrl_dev *pctldev,
+ unsigned function,
+ unsigned group)
+{
+ struct atmel_pioctrl *pctrl = pinctrl_dev_get_drvdata(pctldev);
+ u32 conf;
+ unsigned pin;
+
+ dev_dbg(pctldev->dev, "enable function %s group %s\n",
+ atmel_functions[function], pctrl->groups[group].name);
+
+ pin = pctrl->groups[group].pin;
+ conf = atmel_pin_config_read(pctldev, pin);
+ conf &= (~ATMEL_PIO_CFGR_FUNC_MASK);
+ conf |= (function & ATMEL_PIO_CFGR_FUNC_MASK);
+ dev_dbg(pctldev->dev, "pin: %u, conf: 0x%08x\n", pin, conf);
+ atmel_pin_config_write(pctldev, pin, conf);
+
+ return 0;
+}
+
+static const struct pinmux_ops atmel_pmxops = {
+ .get_functions_count = atmel_pmx_get_functions_count,
+ .get_function_name = atmel_pmx_get_function_name,
+ .get_function_groups = atmel_pmx_get_function_groups,
+ .set_mux = atmel_pmx_set_mux,
+ .gpio_request_enable = NULL,
+ .gpio_disable_free = NULL,
+ .gpio_set_direction = NULL,
+};
+
+static int atmel_conf_pin_config_group_get(struct pinctrl_dev *pctldev,
+ unsigned group,
+ unsigned long *config)
+{
+ struct atmel_pioctrl *pctrl = pinctrl_dev_get_drvdata(pctldev);
+ unsigned int arg = 0;
+ unsigned int param = pinconf_to_config_param(*config);
+ u32 res;
+ struct atmel_group *grp = pctrl->groups + group;
+ unsigned pin_id = grp->pin;
+
+ res = atmel_pin_config_read(pctldev, pin_id);
+
+ switch (param) {
+ case PIN_CONFIG_BIAS_PULL_UP:
+ if (!(res & ATMEL_PIO_PUEN_MASK))
+ return -EINVAL;
+ arg = 1;
+ break;
+ case PIN_CONFIG_BIAS_PULL_DOWN:
+ if ((res & ATMEL_PIO_PUEN_MASK)
+ || (!(res & ATMEL_PIO_PDEN_MASK)))
+ return -EINVAL;
+ arg = 1;
+ break;
+ case PIN_CONFIG_BIAS_DISABLE:
+ if ((res & ATMEL_PIO_PUEN_MASK)
+ || ((res & ATMEL_PIO_PDEN_MASK)))
+ return -EINVAL;
+ arg = 1;
+ break;
+ case PIN_CONFIG_DRIVE_OPEN_DRAIN:
+ if (!(res & ATMEL_PIO_OPD_MASK))
+ return -EINVAL;
+ arg = 1;
+ break;
+ case PIN_CONFIG_INPUT_SCHMITT_ENABLE:
+ if (!(res & ATMEL_PIO_SCHMITT_MASK))
+ return -EINVAL;
+ arg = 1;
+ break;
+ default:
+ return -ENOTSUPP;
+ }
+
+ *config = pinconf_to_config_packed(param, arg);
+ return 0;
+}
+
+static int atmel_conf_pin_config_group_set(struct pinctrl_dev *pctldev,
+ unsigned group,
+ unsigned long *configs,
+ unsigned num_configs)
+{
+ struct atmel_pioctrl *atmel_pioctrl = pinctrl_dev_get_drvdata(pctldev);
+ int i;
+ u32 mask, conf = 0;
+ unsigned bank, pin;
+ struct atmel_group *grp = atmel_pioctrl->groups + group;
+ unsigned pin_id = grp->pin;
+
+ conf = atmel_pin_config_read(pctldev, pin_id);
+
+ for (i = 0; i < num_configs; i++) {
+ unsigned int param = pinconf_to_config_param(configs[i]);
+ unsigned int arg = pinconf_to_config_argument(configs[i]);
+
+ dev_dbg(pctldev->dev, "%s: pin=%u, config=0x%lx\n",
+ __func__, pin_id, configs[i]);
+
+ switch(param) {
+ case PIN_CONFIG_BIAS_DISABLE:
+ conf &= (~ATMEL_PIO_PUEN_MASK);
+ conf &= (~ATMEL_PIO_PDEN_MASK);
+ break;
+ case PIN_CONFIG_BIAS_PULL_UP:
+ conf |= ATMEL_PIO_PUEN_MASK;
+ break;
+ case PIN_CONFIG_BIAS_PULL_DOWN:
+ conf |= ATMEL_PIO_PDEN_MASK;
+ break;
+ case PIN_CONFIG_DRIVE_OPEN_DRAIN:
+ if (arg == 0)
+ conf &= (~ATMEL_PIO_OPD_MASK);
+ else
+ conf |= ATMEL_PIO_OPD_MASK;
+ break;
+ case PIN_CONFIG_INPUT_SCHMITT_ENABLE:
+ if (arg == 0)
+ conf |= ATMEL_PIO_SCHMITT_MASK;
+ else
+ conf &= (~ATMEL_PIO_SCHMITT_MASK);
+ break;
+ case PIN_CONFIG_INPUT_DEBOUNCE:
+ if (arg == 0) {
+ conf &= (~ATMEL_PIO_IFEN_MASK);
+ conf &= (~ATMEL_PIO_IFSCEN_MASK);
+ } else {
+ /*
+ * We don't care about the debounce value for several reasons:
+ * - can't have different debounce periods inside a same group,
+ * - the register to configure this period is a secure register.
+ * The debouncing filter can filter a pulse with a duration of less
+ * than 1/2 slow clock period.
+ */
+ conf |= ATMEL_PIO_IFEN_MASK;
+ conf |= ATMEL_PIO_IFSCEN_MASK;
+ }
+ break;
+ case PIN_CONFIG_OUTPUT:
+ conf |= ATMEL_PIO_DIR_MASK;
+ bank = ATMEL_PIO_BANK(pin_id);
+ pin = ATMEL_PIO_LINE(pin_id);
+ mask = 1 << pin;
+
+ if (arg == 0) {
+ writel_relaxed(mask, atmel_pioctrl->reg_base +
+ bank * ATMEL_PIO_BANK_OFFSET + ATMEL_PIO_CODR);
+ } else {
+ writel_relaxed(mask, atmel_pioctrl->reg_base +
+ bank * ATMEL_PIO_BANK_OFFSET + ATMEL_PIO_SODR);
+ }
+ break;
+ default:
+ dev_warn(pctldev->dev,
+ "unsupported configuration parameter: %u\n",
+ param);
+ continue;
+ }
+ }
+
+ dev_dbg(pctldev->dev, "%s: reg=0x%08x\n", __func__, conf);
+ atmel_pin_config_write(pctldev, pin_id, conf);
+
+ return 0;
+}
+
+static void atmel_conf_pin_config_dbg_show(struct pinctrl_dev *pctldev,
+ struct seq_file *s, unsigned pin_id)
+{
+ struct atmel_pioctrl *pctrl = pinctrl_dev_get_drvdata(pctldev);
+
+ /* TODO: pinconf-pins */
+
+ if (pctrl->pins[pin_id])
+ seq_printf(s, "device: %s, ioset: %u",
+ pctrl->pins[pin_id]->device, pctrl->pins[pin_id]->ioset);
+
+ return;
+}
+
+static const struct pinconf_ops atmel_confops = {
+ .pin_config_group_get = atmel_conf_pin_config_group_get,
+ .pin_config_group_set = atmel_conf_pin_config_group_set,
+ .pin_config_dbg_show = atmel_conf_pin_config_dbg_show,
+};
+
+static struct pinctrl_desc atmel_pinctrl_desc = {
+ .name = "atmel_pinctrl",
+ .confops = &atmel_confops,
+ .pctlops = &atmel_pctlops,
+ .pmxops = &atmel_pmxops,
+};
+
+/*
+ * The number of banks can be different from a SoC to another one.
+ * We can have up to 16 banks.
+ */
+static const struct atmel_pioctrl_data atmel_sama5d2_pioctrl_data = {
+ .nbanks = 4,
+};
+
+static const struct of_device_id atmel_pctrl_of_match[] = {
+ {
+ .compatible = "atmel,sama5d2-pinctrl",
+ .data = &atmel_sama5d2_pioctrl_data,
+ }, {
+ /* sentinel */
+ }
+};
+MODULE_DEVICE_TABLE(of, atmel_pctrl_of_match);
+
+static int atmel_pinctrl_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct pinctrl_pin_desc *pin_desc;
+ const char **group_names;
+ const struct of_device_id *match;
+ int i, ret;
+ struct resource *res;
+ struct atmel_pioctrl *atmel_pioctrl;
+ struct atmel_pioctrl_data *atmel_pioctrl_data;
+
+ atmel_pioctrl = devm_kzalloc(dev, sizeof(*atmel_pioctrl), GFP_KERNEL);
+ if (!atmel_pioctrl)
+ return -ENOMEM;
+ platform_set_drvdata(pdev, atmel_pioctrl);
+
+ match = of_match_node(atmel_pctrl_of_match, dev->of_node);
+ if (!match) {
+ dev_err(dev, "unknown compatible string\n");
+ return -ENODEV;
+ }
+ atmel_pioctrl_data = (struct atmel_pioctrl_data *) match->data;
+ atmel_pioctrl->nbanks = atmel_pioctrl_data->nbanks;
+ atmel_pioctrl->npins = atmel_pioctrl->nbanks * ATMEL_PIO_NPINS_PER_BANK;
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ if (!res) {
+ dev_err(dev, "unable to get atmel pinctrl resource\n");
+ return -EINVAL;
+ }
+ atmel_pioctrl->reg_base = devm_ioremap_resource(dev, res);
+ if (IS_ERR(atmel_pioctrl->reg_base))
+ return -EINVAL;
+
+ atmel_pioctrl->clk = devm_clk_get(dev, NULL);
+ if (IS_ERR(atmel_pioctrl->clk)) {
+ dev_err(dev, "failed to get clock\n");
+ return PTR_ERR(atmel_pioctrl->clk);
+ }
+
+ atmel_pioctrl->pins = devm_kzalloc(dev, sizeof(*atmel_pioctrl->pins)
+ * atmel_pioctrl->npins, GFP_KERNEL);
+ if (!atmel_pioctrl->pins)
+ return -ENOMEM;
+
+ pin_desc = devm_kzalloc(dev, sizeof(*pin_desc)
+ * atmel_pioctrl->npins, GFP_KERNEL);
+ if (!pin_desc)
+ return -ENOMEM;
+ atmel_pinctrl_desc.pins = pin_desc;
+ atmel_pinctrl_desc.npins = atmel_pioctrl->npins;
+
+ /* One pin is one group since a pin can achieve all functions. */
+ group_names = devm_kzalloc(dev, sizeof(*group_names)
+ * atmel_pioctrl->npins, GFP_KERNEL);
+ if (!group_names)
+ return -ENOMEM;
+ atmel_pioctrl->group_names = group_names;
+
+ atmel_pioctrl->groups = devm_kzalloc(&pdev->dev,
+ sizeof(*atmel_pioctrl->groups) * atmel_pioctrl->npins,
+ GFP_KERNEL);
+ if (!atmel_pioctrl->groups)
+ return -ENOMEM;
+ for (i = 0 ; i < atmel_pioctrl->npins; i++) {
+ struct atmel_group *group = atmel_pioctrl->groups + i;
+ unsigned bank = ATMEL_PIO_BANK(i);
+ unsigned line = ATMEL_PIO_LINE(i);
+
+ atmel_pioctrl->pins[i] = devm_kzalloc(dev,
+ sizeof(**atmel_pioctrl->pins), GFP_KERNEL);
+ if (!atmel_pioctrl->pins[i])
+ return -ENOMEM;
+
+ atmel_pioctrl->pins[i]->pin_id = i;
+ atmel_pioctrl->pins[i]->bank = bank;
+ atmel_pioctrl->pins[i]->line = line;
+
+ pin_desc[i].number = i;
+ /* Pin naming convention: P(bank_name)(bank_pin_number). */
+ pin_desc[i].name = kasprintf(GFP_KERNEL, "P%c%d",
+ bank + 'A', line);
+
+ group->name = group_names[i] = pin_desc[i].name;
+ group->pin = pin_desc[i].number;
+
+ dev_dbg(dev, "pin_id=%u, bank=%u, line=%u", i, bank, line);
+ }
+
+ atmel_pioctrl->gpio_chip = &atmel_gpio_chip;
+ atmel_pioctrl->gpio_chip->of_node = dev->of_node;
+ atmel_pioctrl->gpio_chip->ngpio = atmel_pioctrl->npins;
+ atmel_pioctrl->gpio_chip->label = dev_name(dev);
+ atmel_pioctrl->gpio_chip->dev = dev;
+ atmel_pioctrl->gpio_chip->names = atmel_pioctrl->group_names;
+
+ atmel_pioctrl->irqs = devm_kzalloc(dev, sizeof(*atmel_pioctrl->irqs)
+ * atmel_pioctrl->nbanks, GFP_KERNEL);
+ if (!atmel_pioctrl->irqs)
+ return -ENOMEM;
+
+ /* There is one controller but each bank has its own irq line. */
+ for (i = 0; i < atmel_pioctrl->nbanks; i++) {
+ res = platform_get_resource(pdev, IORESOURCE_IRQ, i);
+ if (!res) {
+ dev_err(dev, "missing irq resource for group %c\n",
+ 'A' + i);
+ return -EINVAL;
+ }
+ atmel_pioctrl->irqs[i] = res->start;
+ irq_set_chained_handler(res->start, atmel_gpio_irq_handler);
+ irq_set_handler_data(res->start, atmel_pioctrl);
+ dev_dbg(dev, "bank %i: hwirq=%u\n", i, res->start);
+ }
+
+ atmel_pioctrl->irq_domain = irq_domain_add_linear(dev->of_node,
+ atmel_pioctrl->gpio_chip->ngpio,
+ &irq_domain_simple_ops, NULL);
+ if (!atmel_pioctrl->irq_domain) {
+ dev_err(dev, "can't add the irq domain\n");
+ return -ENODEV;
+ }
+ atmel_pioctrl->irq_domain->name = "atmel gpio";
+
+ for (i = 0; i < atmel_pioctrl->npins; i++) {
+ int irq = irq_create_mapping(atmel_pioctrl->irq_domain, i);
+
+ irq_set_chip_and_handler(irq, &atmel_gpio_irq_chip,
+ handle_simple_irq);
+ irq_set_chip_data(irq, atmel_pioctrl);
+ dev_dbg(dev,
+ "atmel gpio irq domain: hwirq: %d, linux irq: %d\n",
+ i, irq);
+ }
+
+ ret = clk_prepare_enable(atmel_pioctrl->clk);
+ if (ret) {
+ dev_err(dev, "failed to prepare and enable clock\n");
+ goto clk_prepare_enable_error;
+ }
+
+ atmel_pioctrl->pinctrl_dev = pinctrl_register(&atmel_pinctrl_desc, &pdev->dev, atmel_pioctrl);
+ if (!atmel_pioctrl->pinctrl_dev) {
+ dev_err(dev, "pinctrl registration failed\n");
+ goto pinctrl_register_error;
+ }
+
+
+ ret = gpiochip_add(atmel_pioctrl->gpio_chip);
+ if (ret) {
+ dev_err(dev, "failed to add gpiochip\n");
+ goto gpiochip_add_error;
+ }
+
+ ret = gpiochip_add_pin_range(atmel_pioctrl->gpio_chip, dev_name(dev),
+ 0, 0, atmel_pioctrl->gpio_chip->ngpio);
+ if (ret) {
+ dev_err(dev, "failed to add gpio pin range\n");
+ goto gpiochip_add_pin_range_error;
+ }
+
+ dev_info(&pdev->dev, "atmel pinctrl initialized\n");
+
+ return 0;
+
+clk_prepare_enable_error:
+ irq_domain_remove(atmel_pioctrl->irq_domain);
+pinctrl_register_error:
+ clk_disable_unprepare(atmel_pioctrl->clk);
+gpiochip_add_error:
+ pinctrl_unregister(atmel_pioctrl->pinctrl_dev);
+gpiochip_add_pin_range_error:
+ gpiochip_remove(atmel_pioctrl->gpio_chip);
+
+ return ret;
+}
+
+int atmel_pinctrl_remove(struct platform_device *pdev)
+{
+ struct atmel_pioctrl *atmel_pioctrl = platform_get_drvdata(pdev);
+
+ irq_domain_remove(atmel_pioctrl->irq_domain);
+ clk_disable_unprepare(atmel_pioctrl->clk);
+ pinctrl_unregister(atmel_pioctrl->pinctrl_dev);
+ gpiochip_remove(atmel_pioctrl->gpio_chip);
+
+ return 0;
+}
+
+static struct platform_driver atmel_pinctrl_driver = {
+ .driver = {
+ .name = "pinctrl-at91-pio4",
+ .of_match_table = atmel_pctrl_of_match,
+ },
+ .probe = atmel_pinctrl_probe,
+ .remove = atmel_pinctrl_remove,
+};
+module_platform_driver(atmel_pinctrl_driver);
+
+MODULE_AUTHOR(Ludovic Desroches <ludovic.desroches at atmel.com>);
+MODULE_DESCRIPTION("Atmel PIO4 pinctrl driver");
+MODULE_LICENSE("GPL v2");
--
2.5.0
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