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Diffstat (limited to 'drivers/pinctrl/nomadik/pinctrl-abx500.c')
-rw-r--r--drivers/pinctrl/nomadik/pinctrl-abx500.c1101
1 files changed, 1101 insertions, 0 deletions
diff --git a/drivers/pinctrl/nomadik/pinctrl-abx500.c b/drivers/pinctrl/nomadik/pinctrl-abx500.c
new file mode 100644
index 000000000..7aa534576
--- /dev/null
+++ b/drivers/pinctrl/nomadik/pinctrl-abx500.c
@@ -0,0 +1,1101 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (C) ST-Ericsson SA 2013
+ *
+ * Author: Patrice Chotard <patrice.chotard@st.com>
+ *
+ * Driver allows to use AxB5xx unused pins to be used as GPIO
+ */
+#include <linux/kernel.h>
+#include <linux/types.h>
+#include <linux/slab.h>
+#include <linux/init.h>
+#include <linux/err.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
+#include <linux/platform_device.h>
+#include <linux/gpio/driver.h>
+#include <linux/irq.h>
+#include <linux/irqdomain.h>
+#include <linux/interrupt.h>
+#include <linux/bitops.h>
+#include <linux/mfd/abx500.h>
+#include <linux/mfd/abx500/ab8500.h>
+#include <linux/pinctrl/pinctrl.h>
+#include <linux/pinctrl/consumer.h>
+#include <linux/pinctrl/pinmux.h>
+#include <linux/pinctrl/pinconf.h>
+#include <linux/pinctrl/pinconf-generic.h>
+#include <linux/pinctrl/machine.h>
+
+#include "pinctrl-abx500.h"
+#include "../core.h"
+#include "../pinconf.h"
+#include "../pinctrl-utils.h"
+
+/*
+ * GPIO registers offset
+ * Bank: 0x10
+ */
+#define AB8500_GPIO_SEL1_REG 0x00
+#define AB8500_GPIO_SEL2_REG 0x01
+#define AB8500_GPIO_SEL3_REG 0x02
+#define AB8500_GPIO_SEL4_REG 0x03
+#define AB8500_GPIO_SEL5_REG 0x04
+#define AB8500_GPIO_SEL6_REG 0x05
+
+#define AB8500_GPIO_DIR1_REG 0x10
+#define AB8500_GPIO_DIR2_REG 0x11
+#define AB8500_GPIO_DIR3_REG 0x12
+#define AB8500_GPIO_DIR4_REG 0x13
+#define AB8500_GPIO_DIR5_REG 0x14
+#define AB8500_GPIO_DIR6_REG 0x15
+
+#define AB8500_GPIO_OUT1_REG 0x20
+#define AB8500_GPIO_OUT2_REG 0x21
+#define AB8500_GPIO_OUT3_REG 0x22
+#define AB8500_GPIO_OUT4_REG 0x23
+#define AB8500_GPIO_OUT5_REG 0x24
+#define AB8500_GPIO_OUT6_REG 0x25
+
+#define AB8500_GPIO_PUD1_REG 0x30
+#define AB8500_GPIO_PUD2_REG 0x31
+#define AB8500_GPIO_PUD3_REG 0x32
+#define AB8500_GPIO_PUD4_REG 0x33
+#define AB8500_GPIO_PUD5_REG 0x34
+#define AB8500_GPIO_PUD6_REG 0x35
+
+#define AB8500_GPIO_IN1_REG 0x40
+#define AB8500_GPIO_IN2_REG 0x41
+#define AB8500_GPIO_IN3_REG 0x42
+#define AB8500_GPIO_IN4_REG 0x43
+#define AB8500_GPIO_IN5_REG 0x44
+#define AB8500_GPIO_IN6_REG 0x45
+#define AB8500_GPIO_ALTFUN_REG 0x50
+
+#define ABX500_GPIO_INPUT 0
+#define ABX500_GPIO_OUTPUT 1
+
+struct abx500_pinctrl {
+ struct device *dev;
+ struct pinctrl_dev *pctldev;
+ struct abx500_pinctrl_soc_data *soc;
+ struct gpio_chip chip;
+ struct ab8500 *parent;
+ struct abx500_gpio_irq_cluster *irq_cluster;
+ int irq_cluster_size;
+};
+
+static int abx500_gpio_get_bit(struct gpio_chip *chip, u8 reg,
+ unsigned offset, bool *bit)
+{
+ struct abx500_pinctrl *pct = gpiochip_get_data(chip);
+ u8 pos = offset % 8;
+ u8 val;
+ int ret;
+
+ reg += offset / 8;
+ ret = abx500_get_register_interruptible(pct->dev,
+ AB8500_MISC, reg, &val);
+ if (ret < 0) {
+ dev_err(pct->dev,
+ "%s read reg =%x, offset=%x failed (%d)\n",
+ __func__, reg, offset, ret);
+ return ret;
+ }
+
+ *bit = !!(val & BIT(pos));
+
+ return 0;
+}
+
+static int abx500_gpio_set_bits(struct gpio_chip *chip, u8 reg,
+ unsigned offset, int val)
+{
+ struct abx500_pinctrl *pct = gpiochip_get_data(chip);
+ u8 pos = offset % 8;
+ int ret;
+
+ reg += offset / 8;
+ ret = abx500_mask_and_set_register_interruptible(pct->dev,
+ AB8500_MISC, reg, BIT(pos), val << pos);
+ if (ret < 0)
+ dev_err(pct->dev, "%s write reg, %x offset %x failed (%d)\n",
+ __func__, reg, offset, ret);
+
+ return ret;
+}
+
+/**
+ * abx500_gpio_get() - Get the particular GPIO value
+ * @chip: Gpio device
+ * @offset: GPIO number to read
+ */
+static int abx500_gpio_get(struct gpio_chip *chip, unsigned offset)
+{
+ struct abx500_pinctrl *pct = gpiochip_get_data(chip);
+ bool bit;
+ bool is_out;
+ u8 gpio_offset = offset - 1;
+ int ret;
+
+ ret = abx500_gpio_get_bit(chip, AB8500_GPIO_DIR1_REG,
+ gpio_offset, &is_out);
+ if (ret < 0)
+ goto out;
+
+ if (is_out)
+ ret = abx500_gpio_get_bit(chip, AB8500_GPIO_OUT1_REG,
+ gpio_offset, &bit);
+ else
+ ret = abx500_gpio_get_bit(chip, AB8500_GPIO_IN1_REG,
+ gpio_offset, &bit);
+out:
+ if (ret < 0) {
+ dev_err(pct->dev, "%s failed (%d)\n", __func__, ret);
+ return ret;
+ }
+
+ return bit;
+}
+
+static void abx500_gpio_set(struct gpio_chip *chip, unsigned offset, int val)
+{
+ struct abx500_pinctrl *pct = gpiochip_get_data(chip);
+ int ret;
+
+ ret = abx500_gpio_set_bits(chip, AB8500_GPIO_OUT1_REG, offset, val);
+ if (ret < 0)
+ dev_err(pct->dev, "%s write failed (%d)\n", __func__, ret);
+}
+
+static int abx500_gpio_direction_output(struct gpio_chip *chip,
+ unsigned offset,
+ int val)
+{
+ struct abx500_pinctrl *pct = gpiochip_get_data(chip);
+ int ret;
+
+ /* set direction as output */
+ ret = abx500_gpio_set_bits(chip,
+ AB8500_GPIO_DIR1_REG,
+ offset,
+ ABX500_GPIO_OUTPUT);
+ if (ret < 0)
+ goto out;
+
+ /* disable pull down */
+ ret = abx500_gpio_set_bits(chip,
+ AB8500_GPIO_PUD1_REG,
+ offset,
+ ABX500_GPIO_PULL_NONE);
+
+out:
+ if (ret < 0) {
+ dev_err(pct->dev, "%s failed (%d)\n", __func__, ret);
+ return ret;
+ }
+
+ /* set the output as 1 or 0 */
+ return abx500_gpio_set_bits(chip, AB8500_GPIO_OUT1_REG, offset, val);
+}
+
+static int abx500_gpio_direction_input(struct gpio_chip *chip, unsigned offset)
+{
+ /* set the register as input */
+ return abx500_gpio_set_bits(chip,
+ AB8500_GPIO_DIR1_REG,
+ offset,
+ ABX500_GPIO_INPUT);
+}
+
+static int abx500_gpio_to_irq(struct gpio_chip *chip, unsigned offset)
+{
+ struct abx500_pinctrl *pct = gpiochip_get_data(chip);
+ /* The AB8500 GPIO numbers are off by one */
+ int gpio = offset + 1;
+ int hwirq;
+ int i;
+
+ for (i = 0; i < pct->irq_cluster_size; i++) {
+ struct abx500_gpio_irq_cluster *cluster =
+ &pct->irq_cluster[i];
+
+ if (gpio >= cluster->start && gpio <= cluster->end) {
+ /*
+ * The ABx500 GPIO's associated IRQs are clustered together
+ * throughout the interrupt numbers at irregular intervals.
+ * To solve this quandry, we have placed the read-in values
+ * into the cluster information table.
+ */
+ hwirq = gpio - cluster->start + cluster->to_irq;
+ return irq_create_mapping(pct->parent->domain, hwirq);
+ }
+ }
+
+ return -EINVAL;
+}
+
+static int abx500_set_mode(struct pinctrl_dev *pctldev, struct gpio_chip *chip,
+ unsigned gpio, int alt_setting)
+{
+ struct abx500_pinctrl *pct = pinctrl_dev_get_drvdata(pctldev);
+ struct alternate_functions af = pct->soc->alternate_functions[gpio];
+ int ret;
+ int val;
+ unsigned offset;
+
+ const char *modes[] = {
+ [ABX500_DEFAULT] = "default",
+ [ABX500_ALT_A] = "altA",
+ [ABX500_ALT_B] = "altB",
+ [ABX500_ALT_C] = "altC",
+ };
+
+ /* sanity check */
+ if (((alt_setting == ABX500_ALT_A) && (af.gpiosel_bit == UNUSED)) ||
+ ((alt_setting == ABX500_ALT_B) && (af.alt_bit1 == UNUSED)) ||
+ ((alt_setting == ABX500_ALT_C) && (af.alt_bit2 == UNUSED))) {
+ dev_dbg(pct->dev, "pin %d doesn't support %s mode\n", gpio,
+ modes[alt_setting]);
+ return -EINVAL;
+ }
+
+ /* on ABx5xx, there is no GPIO0, so adjust the offset */
+ offset = gpio - 1;
+
+ switch (alt_setting) {
+ case ABX500_DEFAULT:
+ /*
+ * for ABx5xx family, default mode is always selected by
+ * writing 0 to GPIOSELx register, except for pins which
+ * support at least ALT_B mode, default mode is selected
+ * by writing 1 to GPIOSELx register
+ */
+ val = 0;
+ if (af.alt_bit1 != UNUSED)
+ val++;
+
+ ret = abx500_gpio_set_bits(chip, AB8500_GPIO_SEL1_REG,
+ offset, val);
+ break;
+
+ case ABX500_ALT_A:
+ /*
+ * for ABx5xx family, alt_a mode is always selected by
+ * writing 1 to GPIOSELx register, except for pins which
+ * support at least ALT_B mode, alt_a mode is selected
+ * by writing 0 to GPIOSELx register and 0 in ALTFUNC
+ * register
+ */
+ if (af.alt_bit1 != UNUSED) {
+ ret = abx500_gpio_set_bits(chip, AB8500_GPIO_SEL1_REG,
+ offset, 0);
+ if (ret < 0)
+ goto out;
+
+ ret = abx500_gpio_set_bits(chip,
+ AB8500_GPIO_ALTFUN_REG,
+ af.alt_bit1,
+ !!(af.alta_val & BIT(0)));
+ if (ret < 0)
+ goto out;
+
+ if (af.alt_bit2 != UNUSED)
+ ret = abx500_gpio_set_bits(chip,
+ AB8500_GPIO_ALTFUN_REG,
+ af.alt_bit2,
+ !!(af.alta_val & BIT(1)));
+ } else
+ ret = abx500_gpio_set_bits(chip, AB8500_GPIO_SEL1_REG,
+ offset, 1);
+ break;
+
+ case ABX500_ALT_B:
+ ret = abx500_gpio_set_bits(chip, AB8500_GPIO_SEL1_REG,
+ offset, 0);
+ if (ret < 0)
+ goto out;
+
+ ret = abx500_gpio_set_bits(chip, AB8500_GPIO_ALTFUN_REG,
+ af.alt_bit1, !!(af.altb_val & BIT(0)));
+ if (ret < 0)
+ goto out;
+
+ if (af.alt_bit2 != UNUSED)
+ ret = abx500_gpio_set_bits(chip,
+ AB8500_GPIO_ALTFUN_REG,
+ af.alt_bit2,
+ !!(af.altb_val & BIT(1)));
+ break;
+
+ case ABX500_ALT_C:
+ ret = abx500_gpio_set_bits(chip, AB8500_GPIO_SEL1_REG,
+ offset, 0);
+ if (ret < 0)
+ goto out;
+
+ ret = abx500_gpio_set_bits(chip, AB8500_GPIO_ALTFUN_REG,
+ af.alt_bit2, !!(af.altc_val & BIT(0)));
+ if (ret < 0)
+ goto out;
+
+ ret = abx500_gpio_set_bits(chip, AB8500_GPIO_ALTFUN_REG,
+ af.alt_bit2, !!(af.altc_val & BIT(1)));
+ break;
+
+ default:
+ dev_dbg(pct->dev, "unknown alt_setting %d\n", alt_setting);
+
+ return -EINVAL;
+ }
+out:
+ if (ret < 0)
+ dev_err(pct->dev, "%s failed (%d)\n", __func__, ret);
+
+ return ret;
+}
+
+#ifdef CONFIG_DEBUG_FS
+static int abx500_get_mode(struct pinctrl_dev *pctldev, struct gpio_chip *chip,
+ unsigned gpio)
+{
+ u8 mode;
+ bool bit_mode;
+ bool alt_bit1;
+ bool alt_bit2;
+ struct abx500_pinctrl *pct = pinctrl_dev_get_drvdata(pctldev);
+ struct alternate_functions af = pct->soc->alternate_functions[gpio];
+ /* on ABx5xx, there is no GPIO0, so adjust the offset */
+ unsigned offset = gpio - 1;
+ int ret;
+
+ /*
+ * if gpiosel_bit is set to unused,
+ * it means no GPIO or special case
+ */
+ if (af.gpiosel_bit == UNUSED)
+ return ABX500_DEFAULT;
+
+ /* read GpioSelx register */
+ ret = abx500_gpio_get_bit(chip, AB8500_GPIO_SEL1_REG + (offset / 8),
+ af.gpiosel_bit, &bit_mode);
+ if (ret < 0)
+ goto out;
+
+ mode = bit_mode;
+
+ /* sanity check */
+ if ((af.alt_bit1 < UNUSED) || (af.alt_bit1 > 7) ||
+ (af.alt_bit2 < UNUSED) || (af.alt_bit2 > 7)) {
+ dev_err(pct->dev,
+ "alt_bitX value not in correct range (-1 to 7)\n");
+ return -EINVAL;
+ }
+
+ /* if alt_bit2 is used, alt_bit1 must be used too */
+ if ((af.alt_bit2 != UNUSED) && (af.alt_bit1 == UNUSED)) {
+ dev_err(pct->dev,
+ "if alt_bit2 is used, alt_bit1 can't be unused\n");
+ return -EINVAL;
+ }
+
+ /* check if pin use AlternateFunction register */
+ if ((af.alt_bit1 == UNUSED) && (af.alt_bit2 == UNUSED))
+ return mode;
+ /*
+ * if pin GPIOSEL bit is set and pin supports alternate function,
+ * it means DEFAULT mode
+ */
+ if (mode)
+ return ABX500_DEFAULT;
+
+ /*
+ * pin use the AlternatFunction register
+ * read alt_bit1 value
+ */
+ ret = abx500_gpio_get_bit(chip, AB8500_GPIO_ALTFUN_REG,
+ af.alt_bit1, &alt_bit1);
+ if (ret < 0)
+ goto out;
+
+ if (af.alt_bit2 != UNUSED) {
+ /* read alt_bit2 value */
+ ret = abx500_gpio_get_bit(chip, AB8500_GPIO_ALTFUN_REG,
+ af.alt_bit2,
+ &alt_bit2);
+ if (ret < 0)
+ goto out;
+ } else
+ alt_bit2 = 0;
+
+ mode = (alt_bit2 << 1) + alt_bit1;
+ if (mode == af.alta_val)
+ return ABX500_ALT_A;
+ else if (mode == af.altb_val)
+ return ABX500_ALT_B;
+ else
+ return ABX500_ALT_C;
+
+out:
+ dev_err(pct->dev, "%s failed (%d)\n", __func__, ret);
+ return ret;
+}
+
+#include <linux/seq_file.h>
+
+static void abx500_gpio_dbg_show_one(struct seq_file *s,
+ struct pinctrl_dev *pctldev,
+ struct gpio_chip *chip,
+ unsigned offset, unsigned gpio)
+{
+ struct abx500_pinctrl *pct = pinctrl_dev_get_drvdata(pctldev);
+ const char *label = gpiochip_is_requested(chip, offset - 1);
+ u8 gpio_offset = offset - 1;
+ int mode = -1;
+ bool is_out;
+ bool pd;
+ int ret;
+
+ const char *modes[] = {
+ [ABX500_DEFAULT] = "default",
+ [ABX500_ALT_A] = "altA",
+ [ABX500_ALT_B] = "altB",
+ [ABX500_ALT_C] = "altC",
+ };
+
+ const char *pull_up_down[] = {
+ [ABX500_GPIO_PULL_DOWN] = "pull down",
+ [ABX500_GPIO_PULL_NONE] = "pull none",
+ [ABX500_GPIO_PULL_NONE + 1] = "pull none",
+ [ABX500_GPIO_PULL_UP] = "pull up",
+ };
+
+ ret = abx500_gpio_get_bit(chip, AB8500_GPIO_DIR1_REG,
+ gpio_offset, &is_out);
+ if (ret < 0)
+ goto out;
+
+ seq_printf(s, " gpio-%-3d (%-20.20s) %-3s",
+ gpio, label ?: "(none)",
+ is_out ? "out" : "in ");
+
+ if (!is_out) {
+ ret = abx500_gpio_get_bit(chip, AB8500_GPIO_PUD1_REG,
+ gpio_offset, &pd);
+ if (ret < 0)
+ goto out;
+
+ seq_printf(s, " %-9s", pull_up_down[pd]);
+ } else
+ seq_printf(s, " %-9s", chip->get(chip, offset) ? "hi" : "lo");
+
+ mode = abx500_get_mode(pctldev, chip, offset);
+
+ seq_printf(s, " %s", (mode < 0) ? "unknown" : modes[mode]);
+
+out:
+ if (ret < 0)
+ dev_err(pct->dev, "%s failed (%d)\n", __func__, ret);
+}
+
+static void abx500_gpio_dbg_show(struct seq_file *s, struct gpio_chip *chip)
+{
+ unsigned i;
+ unsigned gpio = chip->base;
+ struct abx500_pinctrl *pct = gpiochip_get_data(chip);
+ struct pinctrl_dev *pctldev = pct->pctldev;
+
+ for (i = 0; i < chip->ngpio; i++, gpio++) {
+ /* On AB8500, there is no GPIO0, the first is the GPIO 1 */
+ abx500_gpio_dbg_show_one(s, pctldev, chip, i + 1, gpio);
+ seq_putc(s, '\n');
+ }
+}
+
+#else
+static inline void abx500_gpio_dbg_show_one(struct seq_file *s,
+ struct pinctrl_dev *pctldev,
+ struct gpio_chip *chip,
+ unsigned offset, unsigned gpio)
+{
+}
+#define abx500_gpio_dbg_show NULL
+#endif
+
+static const struct gpio_chip abx500gpio_chip = {
+ .label = "abx500-gpio",
+ .owner = THIS_MODULE,
+ .request = gpiochip_generic_request,
+ .free = gpiochip_generic_free,
+ .direction_input = abx500_gpio_direction_input,
+ .get = abx500_gpio_get,
+ .direction_output = abx500_gpio_direction_output,
+ .set = abx500_gpio_set,
+ .to_irq = abx500_gpio_to_irq,
+ .dbg_show = abx500_gpio_dbg_show,
+};
+
+static int abx500_pmx_get_funcs_cnt(struct pinctrl_dev *pctldev)
+{
+ struct abx500_pinctrl *pct = pinctrl_dev_get_drvdata(pctldev);
+
+ return pct->soc->nfunctions;
+}
+
+static const char *abx500_pmx_get_func_name(struct pinctrl_dev *pctldev,
+ unsigned function)
+{
+ struct abx500_pinctrl *pct = pinctrl_dev_get_drvdata(pctldev);
+
+ return pct->soc->functions[function].name;
+}
+
+static int abx500_pmx_get_func_groups(struct pinctrl_dev *pctldev,
+ unsigned function,
+ const char * const **groups,
+ unsigned * const num_groups)
+{
+ struct abx500_pinctrl *pct = pinctrl_dev_get_drvdata(pctldev);
+
+ *groups = pct->soc->functions[function].groups;
+ *num_groups = pct->soc->functions[function].ngroups;
+
+ return 0;
+}
+
+static int abx500_pmx_set(struct pinctrl_dev *pctldev, unsigned function,
+ unsigned group)
+{
+ struct abx500_pinctrl *pct = pinctrl_dev_get_drvdata(pctldev);
+ struct gpio_chip *chip = &pct->chip;
+ const struct abx500_pingroup *g;
+ int i;
+ int ret = 0;
+
+ g = &pct->soc->groups[group];
+ if (g->altsetting < 0)
+ return -EINVAL;
+
+ dev_dbg(pct->dev, "enable group %s, %u pins\n", g->name, g->npins);
+
+ for (i = 0; i < g->npins; i++) {
+ dev_dbg(pct->dev, "setting pin %d to altsetting %d\n",
+ g->pins[i], g->altsetting);
+
+ ret = abx500_set_mode(pctldev, chip, g->pins[i], g->altsetting);
+ }
+
+ if (ret < 0)
+ dev_err(pct->dev, "%s failed (%d)\n", __func__, ret);
+
+ return ret;
+}
+
+static int abx500_gpio_request_enable(struct pinctrl_dev *pctldev,
+ struct pinctrl_gpio_range *range,
+ unsigned offset)
+{
+ struct abx500_pinctrl *pct = pinctrl_dev_get_drvdata(pctldev);
+ const struct abx500_pinrange *p;
+ int ret;
+ int i;
+
+ /*
+ * Different ranges have different ways to enable GPIO function on a
+ * pin, so refer back to our local range type, where we handily define
+ * what altfunc enables GPIO for a certain pin.
+ */
+ for (i = 0; i < pct->soc->gpio_num_ranges; i++) {
+ p = &pct->soc->gpio_ranges[i];
+ if ((offset >= p->offset) &&
+ (offset < (p->offset + p->npins)))
+ break;
+ }
+
+ if (i == pct->soc->gpio_num_ranges) {
+ dev_err(pct->dev, "%s failed to locate range\n", __func__);
+ return -ENODEV;
+ }
+
+ dev_dbg(pct->dev, "enable GPIO by altfunc %d at gpio %d\n",
+ p->altfunc, offset);
+
+ ret = abx500_set_mode(pct->pctldev, &pct->chip,
+ offset, p->altfunc);
+ if (ret < 0)
+ dev_err(pct->dev, "%s setting altfunc failed\n", __func__);
+
+ return ret;
+}
+
+static void abx500_gpio_disable_free(struct pinctrl_dev *pctldev,
+ struct pinctrl_gpio_range *range,
+ unsigned offset)
+{
+}
+
+static const struct pinmux_ops abx500_pinmux_ops = {
+ .get_functions_count = abx500_pmx_get_funcs_cnt,
+ .get_function_name = abx500_pmx_get_func_name,
+ .get_function_groups = abx500_pmx_get_func_groups,
+ .set_mux = abx500_pmx_set,
+ .gpio_request_enable = abx500_gpio_request_enable,
+ .gpio_disable_free = abx500_gpio_disable_free,
+};
+
+static int abx500_get_groups_cnt(struct pinctrl_dev *pctldev)
+{
+ struct abx500_pinctrl *pct = pinctrl_dev_get_drvdata(pctldev);
+
+ return pct->soc->ngroups;
+}
+
+static const char *abx500_get_group_name(struct pinctrl_dev *pctldev,
+ unsigned selector)
+{
+ struct abx500_pinctrl *pct = pinctrl_dev_get_drvdata(pctldev);
+
+ return pct->soc->groups[selector].name;
+}
+
+static int abx500_get_group_pins(struct pinctrl_dev *pctldev,
+ unsigned selector,
+ const unsigned **pins,
+ unsigned *num_pins)
+{
+ struct abx500_pinctrl *pct = pinctrl_dev_get_drvdata(pctldev);
+
+ *pins = pct->soc->groups[selector].pins;
+ *num_pins = pct->soc->groups[selector].npins;
+
+ return 0;
+}
+
+static void abx500_pin_dbg_show(struct pinctrl_dev *pctldev,
+ struct seq_file *s, unsigned offset)
+{
+ struct abx500_pinctrl *pct = pinctrl_dev_get_drvdata(pctldev);
+ struct gpio_chip *chip = &pct->chip;
+
+ abx500_gpio_dbg_show_one(s, pctldev, chip, offset,
+ chip->base + offset - 1);
+}
+
+static int abx500_dt_add_map_mux(struct pinctrl_map **map,
+ unsigned *reserved_maps,
+ unsigned *num_maps, const char *group,
+ const char *function)
+{
+ if (*num_maps == *reserved_maps)
+ return -ENOSPC;
+
+ (*map)[*num_maps].type = PIN_MAP_TYPE_MUX_GROUP;
+ (*map)[*num_maps].data.mux.group = group;
+ (*map)[*num_maps].data.mux.function = function;
+ (*num_maps)++;
+
+ return 0;
+}
+
+static int abx500_dt_add_map_configs(struct pinctrl_map **map,
+ unsigned *reserved_maps,
+ unsigned *num_maps, const char *group,
+ unsigned long *configs, unsigned num_configs)
+{
+ unsigned long *dup_configs;
+
+ if (*num_maps == *reserved_maps)
+ return -ENOSPC;
+
+ dup_configs = kmemdup(configs, num_configs * sizeof(*dup_configs),
+ GFP_KERNEL);
+ if (!dup_configs)
+ return -ENOMEM;
+
+ (*map)[*num_maps].type = PIN_MAP_TYPE_CONFIGS_PIN;
+
+ (*map)[*num_maps].data.configs.group_or_pin = group;
+ (*map)[*num_maps].data.configs.configs = dup_configs;
+ (*map)[*num_maps].data.configs.num_configs = num_configs;
+ (*num_maps)++;
+
+ return 0;
+}
+
+static const char *abx500_find_pin_name(struct pinctrl_dev *pctldev,
+ const char *pin_name)
+{
+ int i, pin_number;
+ struct abx500_pinctrl *npct = pinctrl_dev_get_drvdata(pctldev);
+
+ if (sscanf((char *)pin_name, "GPIO%d", &pin_number) == 1)
+ for (i = 0; i < npct->soc->npins; i++)
+ if (npct->soc->pins[i].number == pin_number)
+ return npct->soc->pins[i].name;
+ return NULL;
+}
+
+static int abx500_dt_subnode_to_map(struct pinctrl_dev *pctldev,
+ struct device_node *np,
+ struct pinctrl_map **map,
+ unsigned *reserved_maps,
+ unsigned *num_maps)
+{
+ int ret;
+ const char *function = NULL;
+ unsigned long *configs;
+ unsigned int nconfigs = 0;
+ struct property *prop;
+
+ ret = of_property_read_string(np, "function", &function);
+ if (ret >= 0) {
+ const char *group;
+
+ ret = of_property_count_strings(np, "groups");
+ if (ret < 0)
+ goto exit;
+
+ ret = pinctrl_utils_reserve_map(pctldev, map, reserved_maps,
+ num_maps, ret);
+ if (ret < 0)
+ goto exit;
+
+ of_property_for_each_string(np, "groups", prop, group) {
+ ret = abx500_dt_add_map_mux(map, reserved_maps,
+ num_maps, group, function);
+ if (ret < 0)
+ goto exit;
+ }
+ }
+
+ ret = pinconf_generic_parse_dt_config(np, pctldev, &configs, &nconfigs);
+ if (nconfigs) {
+ const char *gpio_name;
+ const char *pin;
+
+ ret = of_property_count_strings(np, "pins");
+ if (ret < 0)
+ goto exit;
+
+ ret = pinctrl_utils_reserve_map(pctldev, map,
+ reserved_maps,
+ num_maps, ret);
+ if (ret < 0)
+ goto exit;
+
+ of_property_for_each_string(np, "pins", prop, pin) {
+ gpio_name = abx500_find_pin_name(pctldev, pin);
+
+ ret = abx500_dt_add_map_configs(map, reserved_maps,
+ num_maps, gpio_name, configs, 1);
+ if (ret < 0)
+ goto exit;
+ }
+ }
+
+exit:
+ return ret;
+}
+
+static int abx500_dt_node_to_map(struct pinctrl_dev *pctldev,
+ struct device_node *np_config,
+ struct pinctrl_map **map, unsigned *num_maps)
+{
+ unsigned reserved_maps;
+ struct device_node *np;
+ int ret;
+
+ reserved_maps = 0;
+ *map = NULL;
+ *num_maps = 0;
+
+ for_each_child_of_node(np_config, np) {
+ ret = abx500_dt_subnode_to_map(pctldev, np, map,
+ &reserved_maps, num_maps);
+ if (ret < 0) {
+ pinctrl_utils_free_map(pctldev, *map, *num_maps);
+ of_node_put(np);
+ return ret;
+ }
+ }
+
+ return 0;
+}
+
+static const struct pinctrl_ops abx500_pinctrl_ops = {
+ .get_groups_count = abx500_get_groups_cnt,
+ .get_group_name = abx500_get_group_name,
+ .get_group_pins = abx500_get_group_pins,
+ .pin_dbg_show = abx500_pin_dbg_show,
+ .dt_node_to_map = abx500_dt_node_to_map,
+ .dt_free_map = pinctrl_utils_free_map,
+};
+
+static int abx500_pin_config_get(struct pinctrl_dev *pctldev,
+ unsigned pin,
+ unsigned long *config)
+{
+ return -ENOSYS;
+}
+
+static int abx500_pin_config_set(struct pinctrl_dev *pctldev,
+ unsigned pin,
+ unsigned long *configs,
+ unsigned num_configs)
+{
+ struct abx500_pinctrl *pct = pinctrl_dev_get_drvdata(pctldev);
+ struct gpio_chip *chip = &pct->chip;
+ unsigned offset;
+ int ret = -EINVAL;
+ int i;
+ enum pin_config_param param;
+ enum pin_config_param argument;
+
+ for (i = 0; i < num_configs; i++) {
+ param = pinconf_to_config_param(configs[i]);
+ argument = pinconf_to_config_argument(configs[i]);
+
+ dev_dbg(chip->parent, "pin %d [%#lx]: %s %s\n",
+ pin, configs[i],
+ (param == PIN_CONFIG_OUTPUT) ? "output " : "input",
+ (param == PIN_CONFIG_OUTPUT) ?
+ (argument ? "high" : "low") :
+ (argument ? "pull up" : "pull down"));
+
+ /* on ABx500, there is no GPIO0, so adjust the offset */
+ offset = pin - 1;
+
+ switch (param) {
+ case PIN_CONFIG_BIAS_DISABLE:
+ ret = abx500_gpio_direction_input(chip, offset);
+ if (ret < 0)
+ goto out;
+
+ /* Chip only supports pull down */
+ ret = abx500_gpio_set_bits(chip,
+ AB8500_GPIO_PUD1_REG, offset,
+ ABX500_GPIO_PULL_NONE);
+ break;
+
+ case PIN_CONFIG_BIAS_PULL_DOWN:
+ ret = abx500_gpio_direction_input(chip, offset);
+ if (ret < 0)
+ goto out;
+ /*
+ * if argument = 1 set the pull down
+ * else clear the pull down
+ * Chip only supports pull down
+ */
+ ret = abx500_gpio_set_bits(chip,
+ AB8500_GPIO_PUD1_REG,
+ offset,
+ argument ? ABX500_GPIO_PULL_DOWN :
+ ABX500_GPIO_PULL_NONE);
+ break;
+
+ case PIN_CONFIG_BIAS_PULL_UP:
+ ret = abx500_gpio_direction_input(chip, offset);
+ if (ret < 0)
+ goto out;
+ /*
+ * if argument = 1 set the pull up
+ * else clear the pull up
+ */
+ ret = abx500_gpio_direction_input(chip, offset);
+ break;
+
+ case PIN_CONFIG_OUTPUT:
+ ret = abx500_gpio_direction_output(chip, offset,
+ argument);
+ break;
+
+ default:
+ dev_err(chip->parent,
+ "illegal configuration requested\n");
+ }
+ } /* for each config */
+out:
+ if (ret < 0)
+ dev_err(pct->dev, "%s failed (%d)\n", __func__, ret);
+
+ return ret;
+}
+
+static const struct pinconf_ops abx500_pinconf_ops = {
+ .pin_config_get = abx500_pin_config_get,
+ .pin_config_set = abx500_pin_config_set,
+ .is_generic = true,
+};
+
+static struct pinctrl_desc abx500_pinctrl_desc = {
+ .name = "pinctrl-abx500",
+ .pctlops = &abx500_pinctrl_ops,
+ .pmxops = &abx500_pinmux_ops,
+ .confops = &abx500_pinconf_ops,
+ .owner = THIS_MODULE,
+};
+
+static int abx500_get_gpio_num(struct abx500_pinctrl_soc_data *soc)
+{
+ unsigned int lowest = 0;
+ unsigned int highest = 0;
+ unsigned int npins = 0;
+ int i;
+
+ /*
+ * Compute number of GPIOs from the last SoC gpio range descriptors
+ * These ranges may include "holes" but the GPIO number space shall
+ * still be homogeneous, so we need to detect and account for any
+ * such holes so that these are included in the number of GPIO pins.
+ */
+ for (i = 0; i < soc->gpio_num_ranges; i++) {
+ unsigned gstart;
+ unsigned gend;
+ const struct abx500_pinrange *p;
+
+ p = &soc->gpio_ranges[i];
+ gstart = p->offset;
+ gend = p->offset + p->npins - 1;
+
+ if (i == 0) {
+ /* First iteration, set start values */
+ lowest = gstart;
+ highest = gend;
+ } else {
+ if (gstart < lowest)
+ lowest = gstart;
+ if (gend > highest)
+ highest = gend;
+ }
+ }
+ /* this gives the absolute number of pins */
+ npins = highest - lowest + 1;
+ return npins;
+}
+
+static const struct of_device_id abx500_gpio_match[] = {
+ { .compatible = "stericsson,ab8500-gpio", .data = (void *)PINCTRL_AB8500, },
+ { .compatible = "stericsson,ab8505-gpio", .data = (void *)PINCTRL_AB8505, },
+ { }
+};
+
+static int abx500_gpio_probe(struct platform_device *pdev)
+{
+ struct device_node *np = pdev->dev.of_node;
+ const struct of_device_id *match;
+ struct abx500_pinctrl *pct;
+ unsigned int id = -1;
+ int ret;
+ int i;
+
+ if (!np) {
+ dev_err(&pdev->dev, "gpio dt node missing\n");
+ return -ENODEV;
+ }
+
+ pct = devm_kzalloc(&pdev->dev, sizeof(*pct), GFP_KERNEL);
+ if (!pct)
+ return -ENOMEM;
+
+ pct->dev = &pdev->dev;
+ pct->parent = dev_get_drvdata(pdev->dev.parent);
+ pct->chip = abx500gpio_chip;
+ pct->chip.parent = &pdev->dev;
+ pct->chip.base = -1; /* Dynamic allocation */
+
+ match = of_match_device(abx500_gpio_match, &pdev->dev);
+ if (!match) {
+ dev_err(&pdev->dev, "gpio dt not matching\n");
+ return -ENODEV;
+ }
+ id = (unsigned long)match->data;
+
+ /* Poke in other ASIC variants here */
+ switch (id) {
+ case PINCTRL_AB8500:
+ abx500_pinctrl_ab8500_init(&pct->soc);
+ break;
+ case PINCTRL_AB8505:
+ abx500_pinctrl_ab8505_init(&pct->soc);
+ break;
+ default:
+ dev_err(&pdev->dev, "Unsupported pinctrl sub driver (%d)\n", id);
+ return -EINVAL;
+ }
+
+ if (!pct->soc) {
+ dev_err(&pdev->dev, "Invalid SOC data\n");
+ return -EINVAL;
+ }
+
+ pct->chip.ngpio = abx500_get_gpio_num(pct->soc);
+ pct->irq_cluster = pct->soc->gpio_irq_cluster;
+ pct->irq_cluster_size = pct->soc->ngpio_irq_cluster;
+
+ ret = gpiochip_add_data(&pct->chip, pct);
+ if (ret) {
+ dev_err(&pdev->dev, "unable to add gpiochip: %d\n", ret);
+ return ret;
+ }
+ dev_info(&pdev->dev, "added gpiochip\n");
+
+ abx500_pinctrl_desc.pins = pct->soc->pins;
+ abx500_pinctrl_desc.npins = pct->soc->npins;
+ pct->pctldev = devm_pinctrl_register(&pdev->dev, &abx500_pinctrl_desc,
+ pct);
+ if (IS_ERR(pct->pctldev)) {
+ dev_err(&pdev->dev,
+ "could not register abx500 pinctrl driver\n");
+ ret = PTR_ERR(pct->pctldev);
+ goto out_rem_chip;
+ }
+ dev_info(&pdev->dev, "registered pin controller\n");
+
+ /* We will handle a range of GPIO pins */
+ for (i = 0; i < pct->soc->gpio_num_ranges; i++) {
+ const struct abx500_pinrange *p = &pct->soc->gpio_ranges[i];
+
+ ret = gpiochip_add_pin_range(&pct->chip,
+ dev_name(&pdev->dev),
+ p->offset - 1, p->offset, p->npins);
+ if (ret < 0)
+ goto out_rem_chip;
+ }
+
+ platform_set_drvdata(pdev, pct);
+ dev_info(&pdev->dev, "initialized abx500 pinctrl driver\n");
+
+ return 0;
+
+out_rem_chip:
+ gpiochip_remove(&pct->chip);
+ return ret;
+}
+
+/**
+ * abx500_gpio_remove() - remove Ab8500-gpio driver
+ * @pdev: Platform device registered
+ */
+static int abx500_gpio_remove(struct platform_device *pdev)
+{
+ struct abx500_pinctrl *pct = platform_get_drvdata(pdev);
+
+ gpiochip_remove(&pct->chip);
+ return 0;
+}
+
+static struct platform_driver abx500_gpio_driver = {
+ .driver = {
+ .name = "abx500-gpio",
+ .of_match_table = abx500_gpio_match,
+ },
+ .probe = abx500_gpio_probe,
+ .remove = abx500_gpio_remove,
+};
+
+static int __init abx500_gpio_init(void)
+{
+ return platform_driver_register(&abx500_gpio_driver);
+}
+core_initcall(abx500_gpio_init);