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Commit 2967dab1 authored by Magnus Damm's avatar Magnus Damm Committed by Paul Mundt
Browse files

sh: GPIO and pinmux base code 



This patch adds gpio code together with the pinmux table parser.
In the future we should optimize this and switch back to gpiolib.

Signed-off-by: default avatarMagnus Damm <damm@igel.co.jp>
Signed-off-by: default avatarPaul Mundt <lethal@linux-sh.org>
parent 14866543

arch/sh/Kconfig

+3 −0
Original line number Diff line number Diff line
@@ -59,6 +59,9 @@ config GENERIC_HARDIRQS_NO__DO_IRQ 
config GENERIC_IRQ_PROBE

	def_bool y



config GENERIC_GPIO

	def_bool n



config GENERIC_CALIBRATE_DELAY

	bool

arch/sh/include/asm/gpio.h

+90 −2
Original line number Diff line number Diff line 
/*

 *  include/asm-sh/gpio.h

 *

 *  Copyright (C) 2007 Markus Brunner, Mark Jonas

 * Generic GPIO API and pinmux table support for SuperH.

 *

 *  Addresses for the Pin Function Controller

 * 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
@@ -16,4 +16,92 @@ 
#include <cpu/gpio.h>

#endif



typedef unsigned short pinmux_enum_t;

typedef unsigned char 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)



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;

	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;

};



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;

};



int register_pinmux(struct pinmux_info *pip);



int __gpio_request(unsigned gpio);

static inline int gpio_request(unsigned gpio, const char *label)

{

	return __gpio_request(gpio);

}

void gpio_free(unsigned gpio);

int gpio_direction_input(unsigned gpio);

int gpio_direction_output(unsigned gpio, int value);

int gpio_get_value(unsigned gpio);

void gpio_set_value(unsigned gpio, int value);

static inline int gpio_export(unsigned gpio, bool direction_may_change)

{

	return 0;

}



#endif /* __ASM_SH_GPIO_H */

arch/sh/kernel/Makefile_32

+1 −1
Original line number Diff line number Diff line
@@ -5,7 +5,7 @@ 
extra-y	:= head_32.o init_task.o vmlinux.lds



obj-y	:= debugtraps.o io.o io_generic.o irq.o machvec.o process_32.o \

	   ptrace_32.o setup.o signal_32.o sys_sh.o sys_sh32.o \

	   ptrace_32.o setup.o signal_32.o sys_sh.o sys_sh32.o gpio.o \

	   syscalls_32.o time_32.o topology.o traps.o traps_32.o



obj-y				+= cpu/ timers/

arch/sh/kernel/Makefile_64

+1 −1
Original line number Diff line number Diff line 
extra-y	:= head_64.o init_task.o vmlinux.lds



obj-y	:= debugtraps.o io.o io_generic.o irq.o machvec.o process_64.o \

	   ptrace_64.o setup.o signal_64.o sys_sh.o sys_sh64.o \

	   ptrace_64.o setup.o signal_64.o sys_sh.o sys_sh64.o gpio.o \

	   syscalls_64.o time_64.o topology.o traps.o traps_64.o



obj-y				+= cpu/ timers/

arch/sh/kernel/gpio.c

0 → 100644
+498 −0
Original line number Diff line number Diff line 
/*

 * 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 <linux/errno.h>

#include <linux/kernel.h>

#include <linux/list.h>

#include <linux/module.h>

#include <linux/clk.h>

#include <linux/err.h>

#include <linux/io.h>

#include <linux/irq.h>

#include <linux/bitops.h>

#include <linux/gpio.h>



static struct pinmux_info *registered_gpio;



static struct pinmux_info *gpio_controller(unsigned gpio)

{

	if (!registered_gpio)

		return NULL;



	if (gpio < registered_gpio->first_gpio)

		return NULL;



	if (gpio > registered_gpio->last_gpio)

		return NULL;



	return registered_gpio;

}



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 int read_write_reg(unsigned long reg, unsigned long reg_width,

			  unsigned long field_width, unsigned long in_pos,

			  unsigned long value, int do_write)

{

	unsigned long data, mask, pos;



	data = 0;

	mask = (1 << field_width) - 1;

	pos = reg_width - ((in_pos + 1) * field_width);



#ifdef DEBUG

	pr_info("%s, addr = %lx, value = %ld, pos = %ld, "

		"r_width = %ld, f_width = %ld\n",

		do_write ? "write" : "read", reg, value, pos,

		reg_width, field_width);

#endif



	switch (reg_width) {

	case 8:

		data = ctrl_inb(reg);

		break;

	case 16:

		data = ctrl_inw(reg);

		break;

	case 32:

		data = ctrl_inl(reg);

		break;

	}



	if (!do_write)

		return (data >> pos) & mask;



	data &= ~(mask << pos);

	data |= value << pos;



	switch (reg_width) {

	case 8:

		ctrl_outb(data, reg);

		break;

	case 16:

		ctrl_outw(data, reg);

		break;

	case 32:

		ctrl_outl(data, reg);

		break;

	}

	return 0;

}



static int get_data_reg(struct pinmux_info *gpioc, unsigned gpio,

			struct pinmux_data_reg **drp, int *bitp)

{

	pinmux_enum_t enum_id = gpioc->gpios[gpio].enum_id;

	struct pinmux_data_reg *data_reg;

	int k, n;



	if (!enum_in_range(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] == enum_id) {

				*drp = data_reg;

				*bitp = n;

				return 0;



			}

		}

		k++;

	}



	return -1;

}



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 int 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;



	return read_write_reg(crp->reg, crp->reg_width,

			      crp->field_width, pos, value, 1);

}



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 (read_write_reg(crp->reg, crp->reg_width,

			   crp->field_width, pos, 0, 0) == value)

		return 0;



	return -1;

}



enum { GPIO_CFG_DRYRUN, GPIO_CFG_REQ, GPIO_CFG_FREE };



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)

			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:

			if (write_config_reg(gpioc, cr, index) != 0)

				goto out_err;

			*cntp = *cntp + 1;

			break;



		case GPIO_CFG_FREE:

			*cntp = *cntp - 1;

			break;

		}

	}



	return 0;

 out_err:

	return -1;

}



static DEFINE_SPINLOCK(gpio_lock);



int __gpio_request(unsigned gpio)

{

	struct pinmux_info *gpioc = gpio_controller(gpio);

	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[gpio].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, gpio, &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, gpio,

				       pinmux_type,

				       GPIO_CFG_DRYRUN) != 0)

			goto err_unlock;



		if (pinmux_config_gpio(gpioc, gpio,

				       pinmux_type,

				       GPIO_CFG_REQ) != 0)

			BUG();

	}



	gpioc->gpios[gpio].flags = pinmux_type;



	ret = 0;

 err_unlock:

	spin_unlock_irqrestore(&gpio_lock, flags);

 err_out:

	return ret;

}

EXPORT_SYMBOL(__gpio_request);



void gpio_free(unsigned gpio)

{

	struct pinmux_info *gpioc = gpio_controller(gpio);

	unsigned long flags;

	int pinmux_type;



	if (!gpioc)

		return;



	spin_lock_irqsave(&gpio_lock, flags);



	pinmux_type = gpioc->gpios[gpio].flags & PINMUX_FLAG_TYPE;

	pinmux_config_gpio(gpioc, gpio, pinmux_type, GPIO_CFG_FREE);

	gpioc->gpios[gpio].flags = PINMUX_TYPE_NONE;



	spin_unlock_irqrestore(&gpio_lock, flags);

}

EXPORT_SYMBOL(gpio_free);



static int pinmux_direction(struct pinmux_info *gpioc,

			    unsigned gpio, int new_pinmux_type)

{

	int ret, pinmux_type;



	ret = -EINVAL;

	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 = new_pinmux_type;



	ret = 0;

 err_out:

	return ret;

}



int gpio_direction_input(unsigned gpio)

{

	struct pinmux_info *gpioc = gpio_controller(gpio);

	unsigned long flags;

	int ret = -EINVAL;



	if (!gpioc)

		goto err_out;



	spin_lock_irqsave(&gpio_lock, flags);

	ret = pinmux_direction(gpioc, gpio, PINMUX_TYPE_INPUT);

	spin_unlock_irqrestore(&gpio_lock, flags);

 err_out:

	return ret;

}

EXPORT_SYMBOL(gpio_direction_input);



static int __gpio_get_set_value(struct pinmux_info *gpioc,

				unsigned gpio, int value,

				int do_write)

{

	struct pinmux_data_reg *dr = NULL;

	int bit = 0;



	if (get_data_reg(gpioc, gpio, &dr, &bit) != 0)

		BUG();

	else

		value = read_write_reg(dr->reg, dr->reg_width,

				       1, bit, value, do_write);



	return value;

}



int gpio_direction_output(unsigned gpio, int value)

{

	struct pinmux_info *gpioc = gpio_controller(gpio);

	unsigned long flags;

	int ret = -EINVAL;



	if (!gpioc)

		goto err_out;



	spin_lock_irqsave(&gpio_lock, flags);

	__gpio_get_set_value(gpioc, gpio, value, 1);

	ret = pinmux_direction(gpioc, gpio, PINMUX_TYPE_OUTPUT);

	spin_unlock_irqrestore(&gpio_lock, flags);

 err_out:

	return ret;

}

EXPORT_SYMBOL(gpio_direction_output);



int gpio_get_value(unsigned gpio)

{

	struct pinmux_info *gpioc = gpio_controller(gpio);

	unsigned long flags;

	int value = 0;



	if (!gpioc)

		BUG();

	else {

		spin_lock_irqsave(&gpio_lock, flags);

		value = __gpio_get_set_value(gpioc, gpio, 0, 0);

		spin_unlock_irqrestore(&gpio_lock, flags);

	}



	return value;

}

EXPORT_SYMBOL(gpio_get_value);



void gpio_set_value(unsigned gpio, int value)

{

	struct pinmux_info *gpioc = gpio_controller(gpio);

	unsigned long flags;



	if (!gpioc)

		BUG();

	else {

		spin_lock_irqsave(&gpio_lock, flags);

		__gpio_get_set_value(gpioc, gpio, value, 1);

		spin_unlock_irqrestore(&gpio_lock, flags);

	}

}

EXPORT_SYMBOL(gpio_set_value);



int register_pinmux(struct pinmux_info *pip)

{

	registered_gpio = pip;

	pr_info("pinmux: %s handling gpio %d -> %d\n",

		pip->name, pip->first_gpio, pip->last_gpio);



	return 0;

}