diff options
Diffstat (limited to 'drivers/pinctrl/pinctrl-abx500.c')
| -rw-r--r-- | drivers/pinctrl/pinctrl-abx500.c | 1361 |
1 files changed, 0 insertions, 1361 deletions
diff --git a/drivers/pinctrl/pinctrl-abx500.c b/drivers/pinctrl/pinctrl-abx500.c deleted file mode 100644 index 163da9c3ea0e..000000000000 --- a/drivers/pinctrl/pinctrl-abx500.c +++ /dev/null @@ -1,1361 +0,0 @@ -/* - * Copyright (C) ST-Ericsson SA 2013 - * - * Author: Patrice Chotard <patrice.chotard@st.com> - * License terms: GNU General Public License (GPL) version 2 - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License version 2 as - * published by the Free Software Foundation. - */ -#include <linux/kernel.h> -#include <linux/types.h> -#include <linux/slab.h> -#include <linux/init.h> -#include <linux/module.h> -#include <linux/err.h> -#include <linux/of.h> -#include <linux/of_device.h> -#include <linux/platform_device.h> -#include <linux/gpio.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" - -/* - * The AB9540 and AB8540 GPIO support are extended versions - * of the AB8500 GPIO support. - * The AB9540 supports an additional (7th) register so that - * more GPIO may be configured and used. - * The AB8540 supports 4 new gpios (GPIOx_VBAT) that have - * internal pull-up and pull-down capabilities. - */ - -/* - * 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 AB9540_GPIO_SEL7_REG 0x06 - -#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 AB9540_GPIO_DIR7_REG 0x16 - -#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 AB9540_GPIO_OUT7_REG 0x26 - -#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 AB9540_GPIO_PUD7_REG 0x36 - -#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 AB9540_GPIO_IN7_REG 0x46 -#define AB8540_GPIO_VINSEL_REG 0x47 -#define AB8540_GPIO_PULL_UPDOWN_REG 0x48 -#define AB8500_GPIO_ALTFUN_REG 0x50 -#define AB8540_GPIO_PULL_UPDOWN_MASK 0x03 -#define AB8540_GPIO_VINSEL_MASK 0x03 -#define AB8540_GPIOX_VBAT_START 51 -#define AB8540_GPIOX_VBAT_END 54 - -#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; -}; - -/** - * to_abx500_pinctrl() - get the pointer to abx500_pinctrl - * @chip: Member of the structure abx500_pinctrl - */ -static inline struct abx500_pinctrl *to_abx500_pinctrl(struct gpio_chip *chip) -{ - return container_of(chip, struct abx500_pinctrl, chip); -} - -static int abx500_gpio_get_bit(struct gpio_chip *chip, u8 reg, - unsigned offset, bool *bit) -{ - struct abx500_pinctrl *pct = to_abx500_pinctrl(chip); - u8 pos = offset % 8; - u8 val; - int ret; - - reg += offset / 8; - ret = abx500_get_register_interruptible(pct->dev, - AB8500_MISC, reg, &val); - - *bit = !!(val & BIT(pos)); - - if (ret < 0) - dev_err(pct->dev, - "%s read reg =%x, offset=%x failed (%d)\n", - __func__, reg, offset, ret); - - return ret; -} - -static int abx500_gpio_set_bits(struct gpio_chip *chip, u8 reg, - unsigned offset, int val) -{ - struct abx500_pinctrl *pct = to_abx500_pinctrl(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 = to_abx500_pinctrl(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 = to_abx500_pinctrl(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_get_pull_updown(struct abx500_pinctrl *pct, int offset, - enum abx500_gpio_pull_updown *pull_updown) -{ - u8 pos; - u8 val; - int ret; - struct pullud *pullud; - - if (!pct->soc->pullud) { - dev_err(pct->dev, "%s AB chip doesn't support pull up/down feature", - __func__); - ret = -EPERM; - goto out; - } - - pullud = pct->soc->pullud; - - if ((offset < pullud->first_pin) - || (offset > pullud->last_pin)) { - ret = -EINVAL; - goto out; - } - - ret = abx500_get_register_interruptible(pct->dev, - AB8500_MISC, AB8540_GPIO_PULL_UPDOWN_REG, &val); - - pos = (offset - pullud->first_pin) << 1; - *pull_updown = (val >> pos) & AB8540_GPIO_PULL_UPDOWN_MASK; - -out: - if (ret < 0) - dev_err(pct->dev, "%s failed (%d)\n", __func__, ret); - - return ret; -} - -static int abx500_set_pull_updown(struct abx500_pinctrl *pct, - int offset, enum abx500_gpio_pull_updown val) -{ - u8 pos; - int ret; - struct pullud *pullud; - - if (!pct->soc->pullud) { - dev_err(pct->dev, "%s AB chip doesn't support pull up/down feature", - __func__); - ret = -EPERM; - goto out; - } - - pullud = pct->soc->pullud; - - if ((offset < pullud->first_pin) - || (offset > pullud->last_pin)) { - ret = -EINVAL; - goto out; - } - pos = (offset - pullud->first_pin) << 1; - - ret = abx500_mask_and_set_register_interruptible(pct->dev, - AB8500_MISC, AB8540_GPIO_PULL_UPDOWN_REG, - AB8540_GPIO_PULL_UPDOWN_MASK << pos, val << pos); - -out: - if (ret < 0) - dev_err(pct->dev, "%s failed (%d)\n", __func__, ret); - - return ret; -} - -static bool abx500_pullud_supported(struct gpio_chip *chip, unsigned gpio) -{ - struct abx500_pinctrl *pct = to_abx500_pinctrl(chip); - struct pullud *pullud = pct->soc->pullud; - - return (pullud && - gpio >= pullud->first_pin && - gpio <= pullud->last_pin); -} - -static int abx500_gpio_direction_output(struct gpio_chip *chip, - unsigned offset, - int val) -{ - struct abx500_pinctrl *pct = to_abx500_pinctrl(chip); - unsigned gpio; - 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); - if (ret < 0) - goto out; - - /* if supported, disable both pull down and pull up */ - gpio = offset + 1; - if (abx500_pullud_supported(chip, gpio)) { - ret = abx500_set_pull_updown(pct, - gpio, - 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 = to_abx500_pinctrl(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, "unknow alt_setting %d\n", alt_setting); - - return -EINVAL; - } -out: - if (ret < 0) - dev_err(pct->dev, "%s failed (%d)\n", __func__, ret); - - return ret; -} - -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; -} - -#ifdef CONFIG_DEBUG_FS - -#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; - enum abx500_gpio_pull_updown pud = 0; - 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) { - if (abx500_pullud_supported(chip, offset)) { - ret = abx500_get_pull_updown(pct, offset, &pud); - if (ret < 0) - goto out; - - seq_printf(s, " %-9s", pull_up_down[pud]); - } else { - 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"); - - if (pctldev) - 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 = to_abx500_pinctrl(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_printf(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 int abx500_gpio_request(struct gpio_chip *chip, unsigned offset) -{ - int gpio = chip->base + offset; - - return pinctrl_request_gpio(gpio); -} - -static void abx500_gpio_free(struct gpio_chip *chip, unsigned offset) -{ - int gpio = chip->base + offset; - - pinctrl_free_gpio(gpio); -} - -static struct gpio_chip abx500gpio_chip = { - .label = "abx500-gpio", - .owner = THIS_MODULE, - .request = abx500_gpio_request, - .free = abx500_gpio_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_enable(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 void abx500_pmx_disable(struct pinctrl_dev *pctldev, - unsigned function, unsigned group) -{ - struct abx500_pinctrl *pct = pinctrl_dev_get_drvdata(pctldev); - const struct abx500_pingroup *g; - - g = &pct->soc->groups[group]; - if (g->altsetting < 0) - return; - - /* FIXME: poke out the mux, set the pin to some default state? */ - dev_dbg(pct->dev, "disable group %s, %u pins\n", g->name, g->npins); -} - -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, - .enable = abx500_pmx_enable, - .disable = abx500_pmx_disable, - .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 void abx500_dt_free_map(struct pinctrl_dev *pctldev, - struct pinctrl_map *map, unsigned num_maps) -{ - int i; - - for (i = 0; i < num_maps; i++) - if (map[i].type == PIN_MAP_TYPE_CONFIGS_PIN) - kfree(map[i].data.configs.configs); - kfree(map); -} - -static int abx500_dt_reserve_map(struct pinctrl_map **map, - unsigned *reserved_maps, - unsigned *num_maps, - unsigned reserve) -{ - unsigned old_num = *reserved_maps; - unsigned new_num = *num_maps + reserve; - struct pinctrl_map *new_map; - - if (old_num >= new_num) - return 0; - - new_map = krealloc(*map, sizeof(*new_map) * new_num, GFP_KERNEL); - if (!new_map) - return -ENOMEM; - - memset(new_map + old_num, 0, (new_num - old_num) * sizeof(*new_map)); - - *map = new_map; - *reserved_maps = new_num; - - return 0; -} - -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; - bool has_config = 0; - unsigned reserve = 0; - struct property *prop; - const char *group, *gpio_name; - struct device_node *np_config; - - ret = of_property_read_string(np, "ste,function", &function); - if (ret >= 0) - reserve = 1; - - ret = pinconf_generic_parse_dt_config(np, &configs, &nconfigs); - if (nconfigs) - has_config = 1; - - np_config = of_parse_phandle(np, "ste,config", 0); - if (np_config) { - ret = pinconf_generic_parse_dt_config(np_config, &configs, - &nconfigs); - if (ret) - goto exit; - has_config |= nconfigs; - } - - ret = of_property_count_strings(np, "ste,pins"); - if (ret < 0) - goto exit; - - if (has_config) - reserve++; - - reserve *= ret; - - ret = abx500_dt_reserve_map(map, reserved_maps, num_maps, reserve); - if (ret < 0) - goto exit; - - of_property_for_each_string(np, "ste,pins", prop, group) { - if (function) { - ret = abx500_dt_add_map_mux(map, reserved_maps, - num_maps, group, function); - if (ret < 0) - goto exit; - } - if (has_config) { - gpio_name = abx500_find_pin_name(pctldev, group); - - 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) { - abx500_dt_free_map(pctldev, *map, *num_maps); - 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 = abx500_dt_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->dev, "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; - /* - * Some chips only support pull down, while some - * actually support both pull up and pull down. Such - * chips have a "pullud" range specified for the pins - * that support both features. If the pin is not - * within that range, we fall back to the old bit set - * that only support pull down. - */ - if (abx500_pullud_supported(chip, pin)) - ret = abx500_set_pull_updown(pct, - pin, - ABX500_GPIO_PULL_NONE); - else - /* 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 - * Some chips only support pull down, while some - * actually support both pull up and pull down. Such - * chips have a "pullud" range specified for the pins - * that support both features. If the pin is not - * within that range, we fall back to the old bit set - * that only support pull down. - */ - if (abx500_pullud_supported(chip, pin)) - ret = abx500_set_pull_updown(pct, - pin, - argument ? ABX500_GPIO_PULL_DOWN : - ABX500_GPIO_PULL_NONE); - else - /* 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); - /* - * Some chips only support pull down, while some - * actually support both pull up and pull down. Such - * chips have a "pullud" range specified for the pins - * that support both features. If the pin is not - * within that range, do nothing - */ - if (abx500_pullud_supported(chip, pin)) - ret = abx500_set_pull_updown(pct, - pin, - argument ? ABX500_GPIO_PULL_UP : - ABX500_GPIO_PULL_NONE); - break; - - case PIN_CONFIG_OUTPUT: - ret = abx500_gpio_direction_output(chip, offset, - argument); - break; - - default: - dev_err(chip->dev, "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, -}; - -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, }, - { .compatible = "stericsson,ab8540-gpio", .data = (void *)PINCTRL_AB8540, }, - { .compatible = "stericsson,ab9540-gpio", .data = (void *)PINCTRL_AB9540, }, - { } -}; - -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, err; - int i; - - if (!np) { - dev_err(&pdev->dev, "gpio dt node missing\n"); - return -ENODEV; - } - - pct = devm_kzalloc(&pdev->dev, sizeof(struct abx500_pinctrl), - GFP_KERNEL); - if (pct == NULL) { - dev_err(&pdev->dev, - "failed to allocate memory for pct\n"); - return -ENOMEM; - } - - pct->dev = &pdev->dev; - pct->parent = dev_get_drvdata(pdev->dev.parent); - pct->chip = abx500gpio_chip; - pct->chip.dev = &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_AB8540: - abx500_pinctrl_ab8540_init(&pct->soc); - break; - case PINCTRL_AB9540: - abx500_pinctrl_ab9540_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(&pct->chip); - 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 = pinctrl_register(&abx500_pinctrl_desc, &pdev->dev, pct); - if (!pct->pctldev) { - dev_err(&pdev->dev, - "could not register abx500 pinctrl driver\n"); - ret = -EINVAL; - 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: - err = gpiochip_remove(&pct->chip); - if (err) - dev_info(&pdev->dev, "failed to remove gpiochip\n"); - - 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); - int ret; - - ret = gpiochip_remove(&pct->chip); - if (ret < 0) { - dev_err(pct->dev, "unable to remove gpiochip: %d\n", - ret); - return ret; - } - - return 0; -} - -static struct platform_driver abx500_gpio_driver = { - .driver = { - .name = "abx500-gpio", - .owner = THIS_MODULE, - .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); - -MODULE_AUTHOR("Patrice Chotard <patrice.chotard@st.com>"); -MODULE_DESCRIPTION("Driver allows to use AxB5xx unused pins to be used as GPIO"); -MODULE_ALIAS("platform:abx500-gpio"); -MODULE_LICENSE("GPL v2"); |