From fae4339919c741f89f7e293b8c646207e1df28e1 Mon Sep 17 00:00:00 2001 From: Magnus Damm Date: Fri, 27 Nov 2009 07:38:01 +0000 Subject: sh: Break out SuperH PFC code This file breaks out the SuperH PFC code from arch/sh/kernel/gpio.c + arch/sh/include/asm/gpio.h to drivers/sh/pfc.c + include/linux/sh_pfc.h. Similar to the INTC stuff. The non-SuperH specific file location makes it possible to share the code between multiple architectures. Signed-off-by: Magnus Damm Signed-off-by: Paul Mundt diff --git a/arch/sh/include/asm/gpio.h b/arch/sh/include/asm/gpio.h index 61f93da..f8d9a73 100644 --- a/arch/sh/include/asm/gpio.h +++ b/arch/sh/include/asm/gpio.h @@ -20,7 +20,7 @@ #endif #define ARCH_NR_GPIOS 512 -#include +#include #ifdef CONFIG_GPIOLIB @@ -53,84 +53,4 @@ static inline int irq_to_gpio(unsigned int irq) #endif /* CONFIG_GPIOLIB */ -typedef unsigned short pinmux_enum_t; -typedef unsigned short pinmux_flag_t; - -#define PINMUX_TYPE_NONE 0 -#define PINMUX_TYPE_FUNCTION 1 -#define PINMUX_TYPE_GPIO 2 -#define PINMUX_TYPE_OUTPUT 3 -#define PINMUX_TYPE_INPUT 4 -#define PINMUX_TYPE_INPUT_PULLUP 5 -#define PINMUX_TYPE_INPUT_PULLDOWN 6 - -#define PINMUX_FLAG_TYPE (0x7) -#define PINMUX_FLAG_WANT_PULLUP (1 << 3) -#define PINMUX_FLAG_WANT_PULLDOWN (1 << 4) - -#define PINMUX_FLAG_DBIT_SHIFT 5 -#define PINMUX_FLAG_DBIT (0x1f << PINMUX_FLAG_DBIT_SHIFT) -#define PINMUX_FLAG_DREG_SHIFT 10 -#define PINMUX_FLAG_DREG (0x3f << PINMUX_FLAG_DREG_SHIFT) - -struct pinmux_gpio { - pinmux_enum_t enum_id; - pinmux_flag_t flags; -}; - -#define PINMUX_GPIO(gpio, data_or_mark) [gpio] = { data_or_mark } -#define PINMUX_DATA(data_or_mark, ids...) data_or_mark, ids, 0 - -struct pinmux_cfg_reg { - unsigned long reg, reg_width, field_width; - unsigned long *cnt; - pinmux_enum_t *enum_ids; -}; - -#define PINMUX_CFG_REG(name, r, r_width, f_width) \ - .reg = r, .reg_width = r_width, .field_width = f_width, \ - .cnt = (unsigned long [r_width / f_width]) {}, \ - .enum_ids = (pinmux_enum_t [(r_width / f_width) * (1 << f_width)]) \ - -struct pinmux_data_reg { - unsigned long reg, reg_width, reg_shadow; - pinmux_enum_t *enum_ids; -}; - -#define PINMUX_DATA_REG(name, r, r_width) \ - .reg = r, .reg_width = r_width, \ - .enum_ids = (pinmux_enum_t [r_width]) \ - -struct pinmux_range { - pinmux_enum_t begin; - pinmux_enum_t end; - pinmux_enum_t force; -}; - -struct pinmux_info { - char *name; - pinmux_enum_t reserved_id; - struct pinmux_range data; - struct pinmux_range input; - struct pinmux_range input_pd; - struct pinmux_range input_pu; - struct pinmux_range output; - struct pinmux_range mark; - struct pinmux_range function; - - unsigned first_gpio, last_gpio; - - struct pinmux_gpio *gpios; - struct pinmux_cfg_reg *cfg_regs; - struct pinmux_data_reg *data_regs; - - pinmux_enum_t *gpio_data; - unsigned int gpio_data_size; - - unsigned long *gpio_in_use; - struct gpio_chip chip; -}; - -int register_pinmux(struct pinmux_info *pip); - #endif /* __ASM_SH_GPIO_H */ diff --git a/arch/sh/kernel/Makefile b/arch/sh/kernel/Makefile index 8edb927..0471a3e 100644 --- a/arch/sh/kernel/Makefile +++ b/arch/sh/kernel/Makefile @@ -32,7 +32,6 @@ obj-$(CONFIG_CRASH_DUMP) += crash_dump.o obj-$(CONFIG_STACKTRACE) += stacktrace.o obj-$(CONFIG_IO_TRAPPED) += io_trapped.o obj-$(CONFIG_KPROBES) += kprobes.o -obj-$(CONFIG_GENERIC_GPIO) += gpio.o obj-$(CONFIG_DYNAMIC_FTRACE) += ftrace.o obj-$(CONFIG_FTRACE_SYSCALLS) += ftrace.o obj-$(CONFIG_FUNCTION_GRAPH_TRACER) += ftrace.o diff --git a/arch/sh/kernel/gpio.c b/arch/sh/kernel/gpio.c deleted file mode 100644 index d22e5af..0000000 --- a/arch/sh/kernel/gpio.c +++ /dev/null @@ -1,584 +0,0 @@ -/* - * Pinmuxed GPIO support for SuperH. - * - * Copyright (C) 2008 Magnus Damm - * - * This file is subject to the terms and conditions of the GNU General Public - * License. See the file "COPYING" in the main directory of this archive - * for more details. - */ - -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include - -static int enum_in_range(pinmux_enum_t enum_id, struct pinmux_range *r) -{ - if (enum_id < r->begin) - return 0; - - if (enum_id > r->end) - return 0; - - return 1; -} - -static unsigned long gpio_read_raw_reg(unsigned long reg, - unsigned long reg_width) -{ - switch (reg_width) { - case 8: - return ctrl_inb(reg); - case 16: - return ctrl_inw(reg); - case 32: - return ctrl_inl(reg); - } - - BUG(); - return 0; -} - -static void gpio_write_raw_reg(unsigned long reg, - unsigned long reg_width, - unsigned long data) -{ - switch (reg_width) { - case 8: - ctrl_outb(data, reg); - return; - case 16: - ctrl_outw(data, reg); - return; - case 32: - ctrl_outl(data, reg); - return; - } - - BUG(); -} - -static void gpio_write_bit(struct pinmux_data_reg *dr, - unsigned long in_pos, unsigned long value) -{ - unsigned long pos; - - pos = dr->reg_width - (in_pos + 1); - -#ifdef DEBUG - pr_info("write_bit addr = %lx, value = %ld, pos = %ld, " - "r_width = %ld\n", - dr->reg, !!value, pos, dr->reg_width); -#endif - - if (value) - set_bit(pos, &dr->reg_shadow); - else - clear_bit(pos, &dr->reg_shadow); - - gpio_write_raw_reg(dr->reg, dr->reg_width, dr->reg_shadow); -} - -static int gpio_read_reg(unsigned long reg, unsigned long reg_width, - unsigned long field_width, unsigned long in_pos) -{ - unsigned long data, mask, pos; - - data = 0; - mask = (1 << field_width) - 1; - pos = reg_width - ((in_pos + 1) * field_width); - -#ifdef DEBUG - pr_info("read_reg: addr = %lx, pos = %ld, " - "r_width = %ld, f_width = %ld\n", - reg, pos, reg_width, field_width); -#endif - - data = gpio_read_raw_reg(reg, reg_width); - return (data >> pos) & mask; -} - -static void gpio_write_reg(unsigned long reg, unsigned long reg_width, - unsigned long field_width, unsigned long in_pos, - unsigned long value) -{ - unsigned long mask, pos; - - mask = (1 << field_width) - 1; - pos = reg_width - ((in_pos + 1) * field_width); - -#ifdef DEBUG - pr_info("write_reg addr = %lx, value = %ld, pos = %ld, " - "r_width = %ld, f_width = %ld\n", - reg, value, pos, reg_width, field_width); -#endif - - mask = ~(mask << pos); - value = value << pos; - - switch (reg_width) { - case 8: - ctrl_outb((ctrl_inb(reg) & mask) | value, reg); - break; - case 16: - ctrl_outw((ctrl_inw(reg) & mask) | value, reg); - break; - case 32: - ctrl_outl((ctrl_inl(reg) & mask) | value, reg); - break; - } -} - -static int setup_data_reg(struct pinmux_info *gpioc, unsigned gpio) -{ - struct pinmux_gpio *gpiop = &gpioc->gpios[gpio]; - struct pinmux_data_reg *data_reg; - int k, n; - - if (!enum_in_range(gpiop->enum_id, &gpioc->data)) - return -1; - - k = 0; - while (1) { - data_reg = gpioc->data_regs + k; - - if (!data_reg->reg_width) - break; - - for (n = 0; n < data_reg->reg_width; n++) { - if (data_reg->enum_ids[n] == gpiop->enum_id) { - gpiop->flags &= ~PINMUX_FLAG_DREG; - gpiop->flags |= (k << PINMUX_FLAG_DREG_SHIFT); - gpiop->flags &= ~PINMUX_FLAG_DBIT; - gpiop->flags |= (n << PINMUX_FLAG_DBIT_SHIFT); - return 0; - } - } - k++; - } - - BUG(); - - return -1; -} - -static void setup_data_regs(struct pinmux_info *gpioc) -{ - struct pinmux_data_reg *drp; - int k; - - for (k = gpioc->first_gpio; k <= gpioc->last_gpio; k++) - setup_data_reg(gpioc, k); - - k = 0; - while (1) { - drp = gpioc->data_regs + k; - - if (!drp->reg_width) - break; - - drp->reg_shadow = gpio_read_raw_reg(drp->reg, drp->reg_width); - k++; - } -} - -static int get_data_reg(struct pinmux_info *gpioc, unsigned gpio, - struct pinmux_data_reg **drp, int *bitp) -{ - struct pinmux_gpio *gpiop = &gpioc->gpios[gpio]; - int k, n; - - if (!enum_in_range(gpiop->enum_id, &gpioc->data)) - return -1; - - k = (gpiop->flags & PINMUX_FLAG_DREG) >> PINMUX_FLAG_DREG_SHIFT; - n = (gpiop->flags & PINMUX_FLAG_DBIT) >> PINMUX_FLAG_DBIT_SHIFT; - *drp = gpioc->data_regs + k; - *bitp = n; - return 0; -} - -static int get_config_reg(struct pinmux_info *gpioc, pinmux_enum_t enum_id, - struct pinmux_cfg_reg **crp, int *indexp, - unsigned long **cntp) -{ - struct pinmux_cfg_reg *config_reg; - unsigned long r_width, f_width; - int k, n; - - k = 0; - while (1) { - config_reg = gpioc->cfg_regs + k; - - r_width = config_reg->reg_width; - f_width = config_reg->field_width; - - if (!r_width) - break; - for (n = 0; n < (r_width / f_width) * 1 << f_width; n++) { - if (config_reg->enum_ids[n] == enum_id) { - *crp = config_reg; - *indexp = n; - *cntp = &config_reg->cnt[n / (1 << f_width)]; - return 0; - } - } - k++; - } - - return -1; -} - -static int get_gpio_enum_id(struct pinmux_info *gpioc, unsigned gpio, - int pos, pinmux_enum_t *enum_idp) -{ - pinmux_enum_t enum_id = gpioc->gpios[gpio].enum_id; - pinmux_enum_t *data = gpioc->gpio_data; - int k; - - if (!enum_in_range(enum_id, &gpioc->data)) { - if (!enum_in_range(enum_id, &gpioc->mark)) { - pr_err("non data/mark enum_id for gpio %d\n", gpio); - return -1; - } - } - - if (pos) { - *enum_idp = data[pos + 1]; - return pos + 1; - } - - for (k = 0; k < gpioc->gpio_data_size; k++) { - if (data[k] == enum_id) { - *enum_idp = data[k + 1]; - return k + 1; - } - } - - pr_err("cannot locate data/mark enum_id for gpio %d\n", gpio); - return -1; -} - -static void write_config_reg(struct pinmux_info *gpioc, - struct pinmux_cfg_reg *crp, - int index) -{ - unsigned long ncomb, pos, value; - - ncomb = 1 << crp->field_width; - pos = index / ncomb; - value = index % ncomb; - - gpio_write_reg(crp->reg, crp->reg_width, crp->field_width, pos, value); -} - -static int check_config_reg(struct pinmux_info *gpioc, - struct pinmux_cfg_reg *crp, - int index) -{ - unsigned long ncomb, pos, value; - - ncomb = 1 << crp->field_width; - pos = index / ncomb; - value = index % ncomb; - - if (gpio_read_reg(crp->reg, crp->reg_width, - crp->field_width, pos) == value) - return 0; - - return -1; -} - -enum { GPIO_CFG_DRYRUN, GPIO_CFG_REQ, GPIO_CFG_FREE }; - -static int pinmux_config_gpio(struct pinmux_info *gpioc, unsigned gpio, - int pinmux_type, int cfg_mode) -{ - struct pinmux_cfg_reg *cr = NULL; - pinmux_enum_t enum_id; - struct pinmux_range *range; - int in_range, pos, index; - unsigned long *cntp; - - switch (pinmux_type) { - - case PINMUX_TYPE_FUNCTION: - range = NULL; - break; - - case PINMUX_TYPE_OUTPUT: - range = &gpioc->output; - break; - - case PINMUX_TYPE_INPUT: - range = &gpioc->input; - break; - - case PINMUX_TYPE_INPUT_PULLUP: - range = &gpioc->input_pu; - break; - - case PINMUX_TYPE_INPUT_PULLDOWN: - range = &gpioc->input_pd; - break; - - default: - goto out_err; - } - - pos = 0; - enum_id = 0; - index = 0; - while (1) { - pos = get_gpio_enum_id(gpioc, gpio, pos, &enum_id); - if (pos <= 0) - goto out_err; - - if (!enum_id) - break; - - in_range = enum_in_range(enum_id, &gpioc->function); - if (!in_range && range) { - in_range = enum_in_range(enum_id, range); - - if (in_range && enum_id == range->force) - continue; - } - - if (!in_range) - continue; - - if (get_config_reg(gpioc, enum_id, &cr, &index, &cntp) != 0) - goto out_err; - - switch (cfg_mode) { - case GPIO_CFG_DRYRUN: - if (!*cntp || !check_config_reg(gpioc, cr, index)) - continue; - break; - - case GPIO_CFG_REQ: - write_config_reg(gpioc, cr, index); - *cntp = *cntp + 1; - break; - - case GPIO_CFG_FREE: - *cntp = *cntp - 1; - break; - } - } - - return 0; - out_err: - return -1; -} - -static DEFINE_SPINLOCK(gpio_lock); - -static struct pinmux_info *chip_to_pinmux(struct gpio_chip *chip) -{ - return container_of(chip, struct pinmux_info, chip); -} - -static int sh_gpio_request(struct gpio_chip *chip, unsigned offset) -{ - struct pinmux_info *gpioc = chip_to_pinmux(chip); - struct pinmux_data_reg *dummy; - unsigned long flags; - int i, ret, pinmux_type; - - ret = -EINVAL; - - if (!gpioc) - goto err_out; - - spin_lock_irqsave(&gpio_lock, flags); - - if ((gpioc->gpios[offset].flags & PINMUX_FLAG_TYPE) != PINMUX_TYPE_NONE) - goto err_unlock; - - /* setup pin function here if no data is associated with pin */ - - if (get_data_reg(gpioc, offset, &dummy, &i) != 0) - pinmux_type = PINMUX_TYPE_FUNCTION; - else - pinmux_type = PINMUX_TYPE_GPIO; - - if (pinmux_type == PINMUX_TYPE_FUNCTION) { - if (pinmux_config_gpio(gpioc, offset, - pinmux_type, - GPIO_CFG_DRYRUN) != 0) - goto err_unlock; - - if (pinmux_config_gpio(gpioc, offset, - pinmux_type, - GPIO_CFG_REQ) != 0) - BUG(); - } - - gpioc->gpios[offset].flags &= ~PINMUX_FLAG_TYPE; - gpioc->gpios[offset].flags |= pinmux_type; - - ret = 0; - err_unlock: - spin_unlock_irqrestore(&gpio_lock, flags); - err_out: - return ret; -} - -static void sh_gpio_free(struct gpio_chip *chip, unsigned offset) -{ - struct pinmux_info *gpioc = chip_to_pinmux(chip); - unsigned long flags; - int pinmux_type; - - if (!gpioc) - return; - - spin_lock_irqsave(&gpio_lock, flags); - - pinmux_type = gpioc->gpios[offset].flags & PINMUX_FLAG_TYPE; - pinmux_config_gpio(gpioc, offset, pinmux_type, GPIO_CFG_FREE); - gpioc->gpios[offset].flags &= ~PINMUX_FLAG_TYPE; - gpioc->gpios[offset].flags |= PINMUX_TYPE_NONE; - - spin_unlock_irqrestore(&gpio_lock, flags); -} - -static int pinmux_direction(struct pinmux_info *gpioc, - unsigned gpio, int new_pinmux_type) -{ - int pinmux_type; - int ret = -EINVAL; - - if (!gpioc) - goto err_out; - - pinmux_type = gpioc->gpios[gpio].flags & PINMUX_FLAG_TYPE; - - switch (pinmux_type) { - case PINMUX_TYPE_GPIO: - break; - case PINMUX_TYPE_OUTPUT: - case PINMUX_TYPE_INPUT: - case PINMUX_TYPE_INPUT_PULLUP: - case PINMUX_TYPE_INPUT_PULLDOWN: - pinmux_config_gpio(gpioc, gpio, pinmux_type, GPIO_CFG_FREE); - break; - default: - goto err_out; - } - - if (pinmux_config_gpio(gpioc, gpio, - new_pinmux_type, - GPIO_CFG_DRYRUN) != 0) - goto err_out; - - if (pinmux_config_gpio(gpioc, gpio, - new_pinmux_type, - GPIO_CFG_REQ) != 0) - BUG(); - - gpioc->gpios[gpio].flags &= ~PINMUX_FLAG_TYPE; - gpioc->gpios[gpio].flags |= new_pinmux_type; - - ret = 0; - err_out: - return ret; -} - -static int sh_gpio_direction_input(struct gpio_chip *chip, unsigned offset) -{ - struct pinmux_info *gpioc = chip_to_pinmux(chip); - unsigned long flags; - int ret; - - spin_lock_irqsave(&gpio_lock, flags); - ret = pinmux_direction(gpioc, offset, PINMUX_TYPE_INPUT); - spin_unlock_irqrestore(&gpio_lock, flags); - - return ret; -} - -static void sh_gpio_set_value(struct pinmux_info *gpioc, - unsigned gpio, int value) -{ - struct pinmux_data_reg *dr = NULL; - int bit = 0; - - if (!gpioc || get_data_reg(gpioc, gpio, &dr, &bit) != 0) - BUG(); - else - gpio_write_bit(dr, bit, value); -} - -static int sh_gpio_direction_output(struct gpio_chip *chip, unsigned offset, - int value) -{ - struct pinmux_info *gpioc = chip_to_pinmux(chip); - unsigned long flags; - int ret; - - sh_gpio_set_value(gpioc, offset, value); - spin_lock_irqsave(&gpio_lock, flags); - ret = pinmux_direction(gpioc, offset, PINMUX_TYPE_OUTPUT); - spin_unlock_irqrestore(&gpio_lock, flags); - - return ret; -} - -static int sh_gpio_get_value(struct pinmux_info *gpioc, unsigned gpio) -{ - struct pinmux_data_reg *dr = NULL; - int bit = 0; - - if (!gpioc || get_data_reg(gpioc, gpio, &dr, &bit) != 0) { - BUG(); - return 0; - } - - return gpio_read_reg(dr->reg, dr->reg_width, 1, bit); -} - -static int sh_gpio_get(struct gpio_chip *chip, unsigned offset) -{ - return sh_gpio_get_value(chip_to_pinmux(chip), offset); -} - -static void sh_gpio_set(struct gpio_chip *chip, unsigned offset, int value) -{ - sh_gpio_set_value(chip_to_pinmux(chip), offset, value); -} - -int register_pinmux(struct pinmux_info *pip) -{ - struct gpio_chip *chip = &pip->chip; - - pr_info("sh pinmux: %s handling gpio %d -> %d\n", - pip->name, pip->first_gpio, pip->last_gpio); - - setup_data_regs(pip); - - chip->request = sh_gpio_request; - chip->free = sh_gpio_free; - chip->direction_input = sh_gpio_direction_input; - chip->get = sh_gpio_get; - chip->direction_output = sh_gpio_direction_output; - chip->set = sh_gpio_set; - - WARN_ON(pip->first_gpio != 0); /* needs testing */ - - chip->label = pip->name; - chip->owner = THIS_MODULE; - chip->base = pip->first_gpio; - chip->ngpio = (pip->last_gpio - pip->first_gpio) + 1; - - return gpiochip_add(chip); -} diff --git a/drivers/sh/Makefile b/drivers/sh/Makefile index 6a025ce..4956bf1 100644 --- a/drivers/sh/Makefile +++ b/drivers/sh/Makefile @@ -3,4 +3,5 @@ # obj-$(CONFIG_SUPERHYWAY) += superhyway/ obj-$(CONFIG_MAPLE) += maple/ +obj-$(CONFIG_GENERIC_GPIO) += pfc.o obj-y += intc.o diff --git a/drivers/sh/pfc.c b/drivers/sh/pfc.c new file mode 100644 index 0000000..d22e5af --- /dev/null +++ b/drivers/sh/pfc.c @@ -0,0 +1,584 @@ +/* + * Pinmuxed GPIO support for SuperH. + * + * Copyright (C) 2008 Magnus Damm + * + * This file is subject to the terms and conditions of the GNU General Public + * License. See the file "COPYING" in the main directory of this archive + * for more details. + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +static int enum_in_range(pinmux_enum_t enum_id, struct pinmux_range *r) +{ + if (enum_id < r->begin) + return 0; + + if (enum_id > r->end) + return 0; + + return 1; +} + +static unsigned long gpio_read_raw_reg(unsigned long reg, + unsigned long reg_width) +{ + switch (reg_width) { + case 8: + return ctrl_inb(reg); + case 16: + return ctrl_inw(reg); + case 32: + return ctrl_inl(reg); + } + + BUG(); + return 0; +} + +static void gpio_write_raw_reg(unsigned long reg, + unsigned long reg_width, + unsigned long data) +{ + switch (reg_width) { + case 8: + ctrl_outb(data, reg); + return; + case 16: + ctrl_outw(data, reg); + return; + case 32: + ctrl_outl(data, reg); + return; + } + + BUG(); +} + +static void gpio_write_bit(struct pinmux_data_reg *dr, + unsigned long in_pos, unsigned long value) +{ + unsigned long pos; + + pos = dr->reg_width - (in_pos + 1); + +#ifdef DEBUG + pr_info("write_bit addr = %lx, value = %ld, pos = %ld, " + "r_width = %ld\n", + dr->reg, !!value, pos, dr->reg_width); +#endif + + if (value) + set_bit(pos, &dr->reg_shadow); + else + clear_bit(pos, &dr->reg_shadow); + + gpio_write_raw_reg(dr->reg, dr->reg_width, dr->reg_shadow); +} + +static int gpio_read_reg(unsigned long reg, unsigned long reg_width, + unsigned long field_width, unsigned long in_pos) +{ + unsigned long data, mask, pos; + + data = 0; + mask = (1 << field_width) - 1; + pos = reg_width - ((in_pos + 1) * field_width); + +#ifdef DEBUG + pr_info("read_reg: addr = %lx, pos = %ld, " + "r_width = %ld, f_width = %ld\n", + reg, pos, reg_width, field_width); +#endif + + data = gpio_read_raw_reg(reg, reg_width); + return (data >> pos) & mask; +} + +static void gpio_write_reg(unsigned long reg, unsigned long reg_width, + unsigned long field_width, unsigned long in_pos, + unsigned long value) +{ + unsigned long mask, pos; + + mask = (1 << field_width) - 1; + pos = reg_width - ((in_pos + 1) * field_width); + +#ifdef DEBUG + pr_info("write_reg addr = %lx, value = %ld, pos = %ld, " + "r_width = %ld, f_width = %ld\n", + reg, value, pos, reg_width, field_width); +#endif + + mask = ~(mask << pos); + value = value << pos; + + switch (reg_width) { + case 8: + ctrl_outb((ctrl_inb(reg) & mask) | value, reg); + break; + case 16: + ctrl_outw((ctrl_inw(reg) & mask) | value, reg); + break; + case 32: + ctrl_outl((ctrl_inl(reg) & mask) | value, reg); + break; + } +} + +static int setup_data_reg(struct pinmux_info *gpioc, unsigned gpio) +{ + struct pinmux_gpio *gpiop = &gpioc->gpios[gpio]; + struct pinmux_data_reg *data_reg; + int k, n; + + if (!enum_in_range(gpiop->enum_id, &gpioc->data)) + return -1; + + k = 0; + while (1) { + data_reg = gpioc->data_regs + k; + + if (!data_reg->reg_width) + break; + + for (n = 0; n < data_reg->reg_width; n++) { + if (data_reg->enum_ids[n] == gpiop->enum_id) { + gpiop->flags &= ~PINMUX_FLAG_DREG; + gpiop->flags |= (k << PINMUX_FLAG_DREG_SHIFT); + gpiop->flags &= ~PINMUX_FLAG_DBIT; + gpiop->flags |= (n << PINMUX_FLAG_DBIT_SHIFT); + return 0; + } + } + k++; + } + + BUG(); + + return -1; +} + +static void setup_data_regs(struct pinmux_info *gpioc) +{ + struct pinmux_data_reg *drp; + int k; + + for (k = gpioc->first_gpio; k <= gpioc->last_gpio; k++) + setup_data_reg(gpioc, k); + + k = 0; + while (1) { + drp = gpioc->data_regs + k; + + if (!drp->reg_width) + break; + + drp->reg_shadow = gpio_read_raw_reg(drp->reg, drp->reg_width); + k++; + } +} + +static int get_data_reg(struct pinmux_info *gpioc, unsigned gpio, + struct pinmux_data_reg **drp, int *bitp) +{ + struct pinmux_gpio *gpiop = &gpioc->gpios[gpio]; + int k, n; + + if (!enum_in_range(gpiop->enum_id, &gpioc->data)) + return -1; + + k = (gpiop->flags & PINMUX_FLAG_DREG) >> PINMUX_FLAG_DREG_SHIFT; + n = (gpiop->flags & PINMUX_FLAG_DBIT) >> PINMUX_FLAG_DBIT_SHIFT; + *drp = gpioc->data_regs + k; + *bitp = n; + return 0; +} + +static int get_config_reg(struct pinmux_info *gpioc, pinmux_enum_t enum_id, + struct pinmux_cfg_reg **crp, int *indexp, + unsigned long **cntp) +{ + struct pinmux_cfg_reg *config_reg; + unsigned long r_width, f_width; + int k, n; + + k = 0; + while (1) { + config_reg = gpioc->cfg_regs + k; + + r_width = config_reg->reg_width; + f_width = config_reg->field_width; + + if (!r_width) + break; + for (n = 0; n < (r_width / f_width) * 1 << f_width; n++) { + if (config_reg->enum_ids[n] == enum_id) { + *crp = config_reg; + *indexp = n; + *cntp = &config_reg->cnt[n / (1 << f_width)]; + return 0; + } + } + k++; + } + + return -1; +} + +static int get_gpio_enum_id(struct pinmux_info *gpioc, unsigned gpio, + int pos, pinmux_enum_t *enum_idp) +{ + pinmux_enum_t enum_id = gpioc->gpios[gpio].enum_id; + pinmux_enum_t *data = gpioc->gpio_data; + int k; + + if (!enum_in_range(enum_id, &gpioc->data)) { + if (!enum_in_range(enum_id, &gpioc->mark)) { + pr_err("non data/mark enum_id for gpio %d\n", gpio); + return -1; + } + } + + if (pos) { + *enum_idp = data[pos + 1]; + return pos + 1; + } + + for (k = 0; k < gpioc->gpio_data_size; k++) { + if (data[k] == enum_id) { + *enum_idp = data[k + 1]; + return k + 1; + } + } + + pr_err("cannot locate data/mark enum_id for gpio %d\n", gpio); + return -1; +} + +static void write_config_reg(struct pinmux_info *gpioc, + struct pinmux_cfg_reg *crp, + int index) +{ + unsigned long ncomb, pos, value; + + ncomb = 1 << crp->field_width; + pos = index / ncomb; + value = index % ncomb; + + gpio_write_reg(crp->reg, crp->reg_width, crp->field_width, pos, value); +} + +static int check_config_reg(struct pinmux_info *gpioc, + struct pinmux_cfg_reg *crp, + int index) +{ + unsigned long ncomb, pos, value; + + ncomb = 1 << crp->field_width; + pos = index / ncomb; + value = index % ncomb; + + if (gpio_read_reg(crp->reg, crp->reg_width, + crp->field_width, pos) == value) + return 0; + + return -1; +} + +enum { GPIO_CFG_DRYRUN, GPIO_CFG_REQ, GPIO_CFG_FREE }; + +static int pinmux_config_gpio(struct pinmux_info *gpioc, unsigned gpio, + int pinmux_type, int cfg_mode) +{ + struct pinmux_cfg_reg *cr = NULL; + pinmux_enum_t enum_id; + struct pinmux_range *range; + int in_range, pos, index; + unsigned long *cntp; + + switch (pinmux_type) { + + case PINMUX_TYPE_FUNCTION: + range = NULL; + break; + + case PINMUX_TYPE_OUTPUT: + range = &gpioc->output; + break; + + case PINMUX_TYPE_INPUT: + range = &gpioc->input; + break; + + case PINMUX_TYPE_INPUT_PULLUP: + range = &gpioc->input_pu; + break; + + case PINMUX_TYPE_INPUT_PULLDOWN: + range = &gpioc->input_pd; + break; + + default: + goto out_err; + } + + pos = 0; + enum_id = 0; + index = 0; + while (1) { + pos = get_gpio_enum_id(gpioc, gpio, pos, &enum_id); + if (pos <= 0) + goto out_err; + + if (!enum_id) + break; + + in_range = enum_in_range(enum_id, &gpioc->function); + if (!in_range && range) { + in_range = enum_in_range(enum_id, range); + + if (in_range && enum_id == range->force) + continue; + } + + if (!in_range) + continue; + + if (get_config_reg(gpioc, enum_id, &cr, &index, &cntp) != 0) + goto out_err; + + switch (cfg_mode) { + case GPIO_CFG_DRYRUN: + if (!*cntp || !check_config_reg(gpioc, cr, index)) + continue; + break; + + case GPIO_CFG_REQ: + write_config_reg(gpioc, cr, index); + *cntp = *cntp + 1; + break; + + case GPIO_CFG_FREE: + *cntp = *cntp - 1; + break; + } + } + + return 0; + out_err: + return -1; +} + +static DEFINE_SPINLOCK(gpio_lock); + +static struct pinmux_info *chip_to_pinmux(struct gpio_chip *chip) +{ + return container_of(chip, struct pinmux_info, chip); +} + +static int sh_gpio_request(struct gpio_chip *chip, unsigned offset) +{ + struct pinmux_info *gpioc = chip_to_pinmux(chip); + struct pinmux_data_reg *dummy; + unsigned long flags; + int i, ret, pinmux_type; + + ret = -EINVAL; + + if (!gpioc) + goto err_out; + + spin_lock_irqsave(&gpio_lock, flags); + + if ((gpioc->gpios[offset].flags & PINMUX_FLAG_TYPE) != PINMUX_TYPE_NONE) + goto err_unlock; + + /* setup pin function here if no data is associated with pin */ + + if (get_data_reg(gpioc, offset, &dummy, &i) != 0) + pinmux_type = PINMUX_TYPE_FUNCTION; + else + pinmux_type = PINMUX_TYPE_GPIO; + + if (pinmux_type == PINMUX_TYPE_FUNCTION) { + if (pinmux_config_gpio(gpioc, offset, + pinmux_type, + GPIO_CFG_DRYRUN) != 0) + goto err_unlock; + + if (pinmux_config_gpio(gpioc, offset, + pinmux_type, + GPIO_CFG_REQ) != 0) + BUG(); + } + + gpioc->gpios[offset].flags &= ~PINMUX_FLAG_TYPE; + gpioc->gpios[offset].flags |= pinmux_type; + + ret = 0; + err_unlock: + spin_unlock_irqrestore(&gpio_lock, flags); + err_out: + return ret; +} + +static void sh_gpio_free(struct gpio_chip *chip, unsigned offset) +{ + struct pinmux_info *gpioc = chip_to_pinmux(chip); + unsigned long flags; + int pinmux_type; + + if (!gpioc) + return; + + spin_lock_irqsave(&gpio_lock, flags); + + pinmux_type = gpioc->gpios[offset].flags & PINMUX_FLAG_TYPE; + pinmux_config_gpio(gpioc, offset, pinmux_type, GPIO_CFG_FREE); + gpioc->gpios[offset].flags &= ~PINMUX_FLAG_TYPE; + gpioc->gpios[offset].flags |= PINMUX_TYPE_NONE; + + spin_unlock_irqrestore(&gpio_lock, flags); +} + +static int pinmux_direction(struct pinmux_info *gpioc, + unsigned gpio, int new_pinmux_type) +{ + int pinmux_type; + int ret = -EINVAL; + + if (!gpioc) + goto err_out; + + pinmux_type = gpioc->gpios[gpio].flags & PINMUX_FLAG_TYPE; + + switch (pinmux_type) { + case PINMUX_TYPE_GPIO: + break; + case PINMUX_TYPE_OUTPUT: + case PINMUX_TYPE_INPUT: + case PINMUX_TYPE_INPUT_PULLUP: + case PINMUX_TYPE_INPUT_PULLDOWN: + pinmux_config_gpio(gpioc, gpio, pinmux_type, GPIO_CFG_FREE); + break; + default: + goto err_out; + } + + if (pinmux_config_gpio(gpioc, gpio, + new_pinmux_type, + GPIO_CFG_DRYRUN) != 0) + goto err_out; + + if (pinmux_config_gpio(gpioc, gpio, + new_pinmux_type, + GPIO_CFG_REQ) != 0) + BUG(); + + gpioc->gpios[gpio].flags &= ~PINMUX_FLAG_TYPE; + gpioc->gpios[gpio].flags |= new_pinmux_type; + + ret = 0; + err_out: + return ret; +} + +static int sh_gpio_direction_input(struct gpio_chip *chip, unsigned offset) +{ + struct pinmux_info *gpioc = chip_to_pinmux(chip); + unsigned long flags; + int ret; + + spin_lock_irqsave(&gpio_lock, flags); + ret = pinmux_direction(gpioc, offset, PINMUX_TYPE_INPUT); + spin_unlock_irqrestore(&gpio_lock, flags); + + return ret; +} + +static void sh_gpio_set_value(struct pinmux_info *gpioc, + unsigned gpio, int value) +{ + struct pinmux_data_reg *dr = NULL; + int bit = 0; + + if (!gpioc || get_data_reg(gpioc, gpio, &dr, &bit) != 0) + BUG(); + else + gpio_write_bit(dr, bit, value); +} + +static int sh_gpio_direction_output(struct gpio_chip *chip, unsigned offset, + int value) +{ + struct pinmux_info *gpioc = chip_to_pinmux(chip); + unsigned long flags; + int ret; + + sh_gpio_set_value(gpioc, offset, value); + spin_lock_irqsave(&gpio_lock, flags); + ret = pinmux_direction(gpioc, offset, PINMUX_TYPE_OUTPUT); + spin_unlock_irqrestore(&gpio_lock, flags); + + return ret; +} + +static int sh_gpio_get_value(struct pinmux_info *gpioc, unsigned gpio) +{ + struct pinmux_data_reg *dr = NULL; + int bit = 0; + + if (!gpioc || get_data_reg(gpioc, gpio, &dr, &bit) != 0) { + BUG(); + return 0; + } + + return gpio_read_reg(dr->reg, dr->reg_width, 1, bit); +} + +static int sh_gpio_get(struct gpio_chip *chip, unsigned offset) +{ + return sh_gpio_get_value(chip_to_pinmux(chip), offset); +} + +static void sh_gpio_set(struct gpio_chip *chip, unsigned offset, int value) +{ + sh_gpio_set_value(chip_to_pinmux(chip), offset, value); +} + +int register_pinmux(struct pinmux_info *pip) +{ + struct gpio_chip *chip = &pip->chip; + + pr_info("sh pinmux: %s handling gpio %d -> %d\n", + pip->name, pip->first_gpio, pip->last_gpio); + + setup_data_regs(pip); + + chip->request = sh_gpio_request; + chip->free = sh_gpio_free; + chip->direction_input = sh_gpio_direction_input; + chip->get = sh_gpio_get; + chip->direction_output = sh_gpio_direction_output; + chip->set = sh_gpio_set; + + WARN_ON(pip->first_gpio != 0); /* needs testing */ + + chip->label = pip->name; + chip->owner = THIS_MODULE; + chip->base = pip->first_gpio; + chip->ngpio = (pip->last_gpio - pip->first_gpio) + 1; + + return gpiochip_add(chip); +} diff --git a/include/linux/sh_pfc.h b/include/linux/sh_pfc.h new file mode 100644 index 0000000..07c08af --- /dev/null +++ b/include/linux/sh_pfc.h @@ -0,0 +1,96 @@ +/* + * SuperH Pin Function Controller Support + * + * Copyright (c) 2008 Magnus Damm + * + * This file is subject to the terms and conditions of the GNU General Public + * License. See the file "COPYING" in the main directory of this archive + * for more details. + */ + +#ifndef __SH_PFC_H +#define __SH_PFC_H + +#include + +typedef unsigned short pinmux_enum_t; +typedef unsigned short pinmux_flag_t; + +#define PINMUX_TYPE_NONE 0 +#define PINMUX_TYPE_FUNCTION 1 +#define PINMUX_TYPE_GPIO 2 +#define PINMUX_TYPE_OUTPUT 3 +#define PINMUX_TYPE_INPUT 4 +#define PINMUX_TYPE_INPUT_PULLUP 5 +#define PINMUX_TYPE_INPUT_PULLDOWN 6 + +#define PINMUX_FLAG_TYPE (0x7) +#define PINMUX_FLAG_WANT_PULLUP (1 << 3) +#define PINMUX_FLAG_WANT_PULLDOWN (1 << 4) + +#define PINMUX_FLAG_DBIT_SHIFT 5 +#define PINMUX_FLAG_DBIT (0x1f << PINMUX_FLAG_DBIT_SHIFT) +#define PINMUX_FLAG_DREG_SHIFT 10 +#define PINMUX_FLAG_DREG (0x3f << PINMUX_FLAG_DREG_SHIFT) + +struct pinmux_gpio { + pinmux_enum_t enum_id; + pinmux_flag_t flags; +}; + +#define PINMUX_GPIO(gpio, data_or_mark) [gpio] = { data_or_mark } +#define PINMUX_DATA(data_or_mark, ids...) data_or_mark, ids, 0 + +struct pinmux_cfg_reg { + unsigned long reg, reg_width, field_width; + unsigned long *cnt; + pinmux_enum_t *enum_ids; +}; + +#define PINMUX_CFG_REG(name, r, r_width, f_width) \ + .reg = r, .reg_width = r_width, .field_width = f_width, \ + .cnt = (unsigned long [r_width / f_width]) {}, \ + .enum_ids = (pinmux_enum_t [(r_width / f_width) * (1 << f_width)]) \ + +struct pinmux_data_reg { + unsigned long reg, reg_width, reg_shadow; + pinmux_enum_t *enum_ids; +}; + +#define PINMUX_DATA_REG(name, r, r_width) \ + .reg = r, .reg_width = r_width, \ + .enum_ids = (pinmux_enum_t [r_width]) \ + +struct pinmux_range { + pinmux_enum_t begin; + pinmux_enum_t end; + pinmux_enum_t force; +}; + +struct pinmux_info { + char *name; + pinmux_enum_t reserved_id; + struct pinmux_range data; + struct pinmux_range input; + struct pinmux_range input_pd; + struct pinmux_range input_pu; + struct pinmux_range output; + struct pinmux_range mark; + struct pinmux_range function; + + unsigned first_gpio, last_gpio; + + struct pinmux_gpio *gpios; + struct pinmux_cfg_reg *cfg_regs; + struct pinmux_data_reg *data_regs; + + pinmux_enum_t *gpio_data; + unsigned int gpio_data_size; + + unsigned long *gpio_in_use; + struct gpio_chip chip; +}; + +int register_pinmux(struct pinmux_info *pip); + +#endif /* __SH_PFC_H */ -- cgit v0.10.2