sh: Add support pin function control using GPIO
Renesas SH and R-Mobile set up device using PFC.
This provide the framework. Most codes were brought from linux kernel.
Signed-off-by: Nobuhiro Iwamatsu <nobuhiro.iwamatsu.yj@renesas.com>
Signed-off-by: Nobuhiro Iwamatsu <iwamatsu@nigauri.org>
diff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile
index 32a2474..106549d 100644
--- a/drivers/gpio/Makefile
+++ b/drivers/gpio/Makefile
@@ -40,6 +40,7 @@
COBJS-$(CONFIG_DA8XX_GPIO) += da8xx_gpio.o
COBJS-$(CONFIG_ALTERA_PIO) += altera_pio.o
COBJS-$(CONFIG_MPC83XX_GPIO) += mpc83xx_gpio.o
+COBJS-$(CONFIG_SH_GPIO_PFC) += sh_pfc.o
COBJS := $(COBJS-y)
SRCS := $(COBJS:.o=.c)
diff --git a/drivers/gpio/sh_pfc.c b/drivers/gpio/sh_pfc.c
new file mode 100644
index 0000000..7a5af20
--- /dev/null
+++ b/drivers/gpio/sh_pfc.c
@@ -0,0 +1,629 @@
+/*
+ * Pinmuxed GPIO support for SuperH.
+ * Copy from linux kernel driver/sh/pfc.c
+ *
+ * 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 <common.h>
+#include <asm/bitops.h>
+#include <asm/io.h>
+#include <sh_pfc.h>
+
+static struct pinmux_info *gpioc;
+
+#define pfc_phys_to_virt(p, a) ((void *)a)
+
+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(void *mapped_reg,
+ unsigned long reg_width)
+{
+ switch (reg_width) {
+
+ case 8:
+ return readb(mapped_reg);
+ case 16:
+ return readw(mapped_reg);
+ case 32:
+ return readl(mapped_reg);
+ }
+
+ BUG();
+ return 0;
+}
+
+static void gpio_write_raw_reg(void *mapped_reg,
+ unsigned long reg_width,
+ unsigned long data)
+{
+ switch (reg_width) {
+ case 8:
+ writeb(data, mapped_reg);
+ return;
+ case 16:
+ writew(data, mapped_reg);
+ return;
+ case 32:
+ writel(data, mapped_reg);
+ return;
+ }
+
+ BUG();
+}
+
+static int gpio_read_bit(struct pinmux_data_reg *dr,
+ unsigned long in_pos)
+{
+ unsigned long pos;
+
+ pos = dr->reg_width - (in_pos + 1);
+
+ debug("read_bit: addr = %lx, pos = %ld, "
+ "r_width = %ld\n", dr->reg, pos, dr->reg_width);
+
+ return (gpio_read_raw_reg(dr->mapped_reg, dr->reg_width) >> pos) & 1;
+}
+
+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);
+
+ debug("write_bit addr = %lx, value = %d, pos = %ld, "
+ "r_width = %ld\n",
+ dr->reg, !!value, pos, dr->reg_width);
+
+ if (value)
+ __set_bit(pos, &dr->reg_shadow);
+ else
+ __clear_bit(pos, &dr->reg_shadow);
+
+ gpio_write_raw_reg(dr->mapped_reg, dr->reg_width, dr->reg_shadow);
+}
+
+static void config_reg_helper(struct pinmux_info *gpioc,
+ struct pinmux_cfg_reg *crp,
+ unsigned long in_pos,
+#if 0
+ void __iomem **mapped_regp,
+#else
+ void **mapped_regp,
+#endif
+ unsigned long *maskp,
+ unsigned long *posp)
+{
+ int k;
+
+ *mapped_regp = pfc_phys_to_virt(gpioc, crp->reg);
+
+ if (crp->field_width) {
+ *maskp = (1 << crp->field_width) - 1;
+ *posp = crp->reg_width - ((in_pos + 1) * crp->field_width);
+ } else {
+ *maskp = (1 << crp->var_field_width[in_pos]) - 1;
+ *posp = crp->reg_width;
+ for (k = 0; k <= in_pos; k++)
+ *posp -= crp->var_field_width[k];
+ }
+}
+
+static int read_config_reg(struct pinmux_info *gpioc,
+ struct pinmux_cfg_reg *crp,
+ unsigned long field)
+{
+ void *mapped_reg;
+
+ unsigned long mask, pos;
+
+ config_reg_helper(gpioc, crp, field, &mapped_reg, &mask, &pos);
+
+ debug("read_reg: addr = %lx, field = %ld, "
+ "r_width = %ld, f_width = %ld\n",
+ crp->reg, field, crp->reg_width, crp->field_width);
+
+ return (gpio_read_raw_reg(mapped_reg, crp->reg_width) >> pos) & mask;
+}
+
+static void write_config_reg(struct pinmux_info *gpioc,
+ struct pinmux_cfg_reg *crp,
+ unsigned long field, unsigned long value)
+{
+ void *mapped_reg;
+ unsigned long mask, pos, data;
+
+ config_reg_helper(gpioc, crp, field, &mapped_reg, &mask, &pos);
+
+ debug("write_reg addr = %lx, value = %ld, field = %ld, "
+ "r_width = %ld, f_width = %ld\n",
+ crp->reg, value, field, crp->reg_width, crp->field_width);
+
+ mask = ~(mask << pos);
+ value = value << pos;
+
+ data = gpio_read_raw_reg(mapped_reg, crp->reg_width);
+ data &= mask;
+ data |= value;
+
+ if (gpioc->unlock_reg)
+ gpio_write_raw_reg(pfc_phys_to_virt(gpioc, gpioc->unlock_reg),
+ 32, ~data);
+
+ gpio_write_raw_reg(mapped_reg, crp->reg_width, data);
+}
+
+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;
+
+ data_reg->mapped_reg = pfc_phys_to_virt(gpioc, data_reg->reg);
+
+ 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->mapped_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 *fieldp, int *valuep,
+ unsigned long **cntp)
+{
+ struct pinmux_cfg_reg *config_reg;
+ unsigned long r_width, f_width, curr_width, ncomb;
+ int k, m, n, pos, bit_pos;
+
+ 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;
+
+ pos = 0;
+ m = 0;
+ for (bit_pos = 0; bit_pos < r_width; bit_pos += curr_width) {
+ if (f_width)
+ curr_width = f_width;
+ else
+ curr_width = config_reg->var_field_width[m];
+
+ ncomb = 1 << curr_width;
+ for (n = 0; n < ncomb; n++) {
+ if (config_reg->enum_ids[pos + n] == enum_id) {
+ *crp = config_reg;
+ *fieldp = m;
+ *valuep = n;
+ *cntp = &config_reg->cnt[m];
+ return 0;
+ }
+ }
+ pos += ncomb;
+ m++;
+ }
+ 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)) {
+ debug("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;
+ }
+ }
+
+ debug("cannot locate data/mark enum_id for gpio %d\n", gpio);
+ 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, field, value;
+ 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;
+ field = 0;
+ value = 0;
+ while (1) {
+ pos = get_gpio_enum_id(gpioc, gpio, pos, &enum_id);
+ if (pos <= 0)
+ goto out_err;
+
+ if (!enum_id)
+ break;
+
+ /* first check if this is a function enum */
+ in_range = enum_in_range(enum_id, &gpioc->function);
+ if (!in_range) {
+ /* not a function enum */
+ if (range) {
+ /*
+ * other range exists, so this pin is
+ * a regular GPIO pin that now is being
+ * bound to a specific direction.
+ *
+ * for this case we only allow function enums
+ * and the enums that match the other range.
+ */
+ in_range = enum_in_range(enum_id, range);
+
+ /*
+ * special case pass through for fixed
+ * input-only or output-only pins without
+ * function enum register association.
+ */
+ if (in_range && enum_id == range->force)
+ continue;
+ } else {
+ /*
+ * no other range exists, so this pin
+ * must then be of the function type.
+ *
+ * allow function type pins to select
+ * any combination of function/in/out
+ * in their MARK lists.
+ */
+ in_range = 1;
+ }
+ }
+
+ if (!in_range)
+ continue;
+
+ if (get_config_reg(gpioc, enum_id, &cr,
+ &field, &value, &cntp) != 0)
+ goto out_err;
+
+ switch (cfg_mode) {
+ case GPIO_CFG_DRYRUN:
+ if (!*cntp ||
+ (read_config_reg(gpioc, cr, field) != value))
+ continue;
+ break;
+
+ case GPIO_CFG_REQ:
+ write_config_reg(gpioc, cr, field, value);
+ *cntp = *cntp + 1;
+ break;
+
+ case GPIO_CFG_FREE:
+ *cntp = *cntp - 1;
+ break;
+ }
+ }
+
+ return 0;
+ out_err:
+ return -1;
+}
+
+#if 0
+static DEFINE_SPINLOCK(gpio_lock);
+static struct pinmux_info *chip_to_pinmux(struct gpio_chip *chip)
+{
+ return container_of(chip, struct pinmux_info, chip);
+}
+#endif
+
+static int sh_gpio_request(unsigned offset)
+{
+ struct pinmux_data_reg *dummy;
+ int i, ret, pinmux_type;
+
+ ret = -1;
+
+ if (!gpioc)
+ goto err_out;
+
+ if ((gpioc->gpios[offset].flags & PINMUX_FLAG_TYPE) != PINMUX_TYPE_NONE)
+ goto err_out;
+
+ /* 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_out;
+
+ 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_out:
+ return ret;
+}
+
+static void sh_gpio_free(unsigned offset)
+{
+ int pinmux_type;
+
+ if (!gpioc)
+ return;
+
+ 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;
+}
+
+static int pinmux_direction(struct pinmux_info *gpioc,
+ unsigned gpio, int new_pinmux_type)
+{
+ int pinmux_type;
+ int ret = -1;
+
+ 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(unsigned offset)
+{
+ return pinmux_direction(gpioc, offset, PINMUX_TYPE_INPUT);
+}
+
+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(unsigned offset, int value)
+{
+ sh_gpio_set_value(gpioc, offset, value);
+ return pinmux_direction(gpioc, offset, PINMUX_TYPE_OUTPUT);
+}
+
+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)
+ return -1;
+
+ return gpio_read_bit(dr, bit);
+}
+
+static int sh_gpio_get(unsigned offset)
+{
+ return sh_gpio_get_value(gpioc, offset);
+}
+
+static void sh_gpio_set(unsigned offset, int value)
+{
+ sh_gpio_set_value(gpioc, offset, value);
+}
+
+int register_pinmux(struct pinmux_info *pip)
+{
+ if (pip != NULL) {
+ gpioc = pip;
+ debug("%s deregistering\n", pip->name);
+ setup_data_regs(gpioc);
+ }
+ return 0;
+}
+
+int unregister_pinmux(struct pinmux_info *pip)
+{
+ debug("%s deregistering\n", pip->name);
+ if (gpioc != pip)
+ return -1;
+
+ gpioc = NULL;
+ return 0;
+}
+
+int gpio_request(unsigned gpio, const char *label)
+{
+ sh_gpio_request(gpio);
+ return 0;
+}
+
+int gpio_free(unsigned gpio)
+{
+ sh_gpio_free(gpio);
+ return 0;
+}
+
+int gpio_direction_input(unsigned gpio)
+{
+ return sh_gpio_direction_input(gpio);
+}
+
+int gpio_direction_output(unsigned gpio, int value)
+{
+ return sh_gpio_direction_output(gpio, value);
+}
+
+void gpio_set_value(unsigned gpio, int value)
+{
+ sh_gpio_set(gpio, value);
+}
+
+int gpio_get_value(unsigned gpio)
+{
+ return sh_gpio_get(gpio);
+}