gpio: Replace ARM gpio.h with the common API in include/asm-generic

ARM boards should use the generic GPIO API
This means changing gpio to unsigned type
Remove the unused gpio_toggle() function which is not part of the API
Comment that free should not modify pin state

Signed-off-by: Joe Hershberger <joe.hershberger@ni.com>
Cc: Joe Hershberger <joe.hershberger@gmail.com>

fixed merge conflict in da8xx_gpio.c, tegra2_gpio.c, and
extended to the new mxs_gpio.c.

Signed-off-by: Kim Phillips <kim.phillips@freescale.com>
Cc: Albert ARIBAUD <albert.u.boot@aribaud.net>

arch/arm/cpu/armv7/omap-common/gpio.c

@@ -36,7 +36,7 @@
  * published by the Free Software Foundation.
  */
 #include <common.h>
-#include <asm/arch/gpio.h>
+#include <asm/gpio.h>
 #include <asm/io.h>
 #include <asm/errno.h>
 
@@ -56,17 +56,17 @@ static inline int get_gpio_index(int gpio)
 static inline int gpio_valid(int gpio)
 {
 	if (gpio < 0)
-		return -EINVAL;
+		return -1;
 	if (gpio < 192)
 		return 0;
-	return -EINVAL;
+	return -1;
 }
 
 static int check_gpio(int gpio)
 {
 	if (gpio_valid(gpio) < 0) {
 		printf("ERROR : check_gpio: invalid GPIO %d\n", gpio);
-		return -EINVAL;
+		return -1;
 	}
 	return 0;
 }
@@ -106,7 +106,7 @@ static int _get_gpio_direction(const struct gpio_bank *bank, int gpio)
 		reg += OMAP_GPIO_OE;
 		break;
 	default:
-		return -EINVAL;
+		return -1;
 	}
 
 	v = __raw_readl(reg);
@@ -142,27 +142,29 @@ static void _set_gpio_dataout(const struct gpio_bank *bank, int gpio,
 /**
  * Set value of the specified gpio
  */
-void gpio_set_value(int gpio, int value)
+int gpio_set_value(unsigned gpio, int value)
 {
 	const struct gpio_bank *bank;
 
 	if (check_gpio(gpio) < 0)
-		return;
+		return -1;
 	bank = get_gpio_bank(gpio);
 	_set_gpio_dataout(bank, get_gpio_index(gpio), value);
+
+	return 0;
 }
 
 /**
  * Get value of the specified gpio
  */
-int gpio_get_value(int gpio)
+int gpio_get_value(unsigned gpio)
 {
 	const struct gpio_bank *bank;
 	void *reg;
 	int input;
 
 	if (check_gpio(gpio) < 0)
-		return -EINVAL;
+		return -1;
 	bank = get_gpio_bank(gpio);
 	reg = bank->base;
 	switch (bank->method) {
@@ -176,11 +178,11 @@ int gpio_get_value(int gpio)
 			reg += OMAP_GPIO_DATAOUT;
 			break;
 		default:
-			return -EINVAL;
+			return -1;
 		}
 		break;
 	default:
-		return -EINVAL;
+		return -1;
 	}
 	return (__raw_readl(reg)
 			& (1 << get_gpio_index(gpio))) != 0;
@@ -194,7 +196,7 @@ int gpio_direction_input(unsigned gpio)
 	const struct gpio_bank *bank;
 
 	if (check_gpio(gpio) < 0)
-		return -EINVAL;
+		return -1;
 
 	bank = get_gpio_bank(gpio);
 	_set_gpio_direction(bank, get_gpio_index(gpio), 1);
@@ -210,7 +212,7 @@ int gpio_direction_output(unsigned gpio, int value)
 	const struct gpio_bank *bank;
 
 	if (check_gpio(gpio) < 0)
-		return -EINVAL;
+		return -1;
 
 	bank = get_gpio_bank(gpio);
 	_set_gpio_dataout(bank, get_gpio_index(gpio), value);
@@ -224,10 +226,10 @@ int gpio_direction_output(unsigned gpio, int value)
  *
  * NOTE: Argument 'label' is unused.
  */
-int gpio_request(int gpio, const char *label)
+int gpio_request(unsigned gpio, const char *label)
 {
 	if (check_gpio(gpio) < 0)
-		return -EINVAL;
+		return -1;
 
 	return 0;
 }
@@ -235,6 +237,7 @@ int gpio_request(int gpio, const char *label)
 /**
  * Reset and free the gpio after using it.
  */
-void gpio_free(unsigned gpio)
+int gpio_free(unsigned gpio)
 {
+	return 0;
 }

arch/arm/include/asm/gpio.h

@@ -1,38 +1,2 @@
-/*
- * Copyright (c) 2011, NVIDIA Corp. All rights reserved.
- * See file CREDITS for list of people who contributed to this
- * project.
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License as
- * published by the Free Software Foundation; either version 2 of
- * the License, or (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
- * MA 02111-1307 USA
- */
-
-#ifndef _GPIO_H_
-#define _GPIO_H_
-
 #include <asm/arch/gpio.h>
-/*
- * Generic GPIO API
- */
-
-int gpio_request(int gp, const char *label);
-void gpio_free(int gp);
-void gpio_toggle_value(int gp);
-int gpio_direction_input(int gp);
-int gpio_direction_output(int gp, int value);
-int gpio_get_value(int gp);
-void gpio_set_value(int gp, int value);
-
-#endif	/* _GPIO_H_ */
+#include <asm-generic/gpio.h>

drivers/gpio/da8xx_gpio.c

@@ -23,7 +23,6 @@
 #include <common.h>
 #include <asm/io.h>
 #include <asm/gpio.h>
-#include <asm/arch/gpio.h>
 #include <asm/arch/hardware.h>
 #include <asm/arch/davinci_misc.h>
 
@@ -181,87 +180,93 @@ static const struct pinmux_config gpio_pinmux[] = {
 	{ pinmux(18), 8, 2 },
 };
 
-int gpio_request(int gp, const char *label)
+int gpio_request(unsigned gpio, const char *label)
 {
-	if (gp >= MAX_NUM_GPIOS)
+	if (gpio >= MAX_NUM_GPIOS)
 		return -1;
 
-	if (gpio_registry[gp].is_registered)
+	if (gpio_registry[gpio].is_registered)
 		return -1;
 
-	gpio_registry[gp].is_registered = 1;
-	strncpy(gpio_registry[gp].name, label, GPIO_NAME_SIZE);
-	gpio_registry[gp].name[GPIO_NAME_SIZE - 1] = 0;
+	gpio_registry[gpio].is_registered = 1;
+	strncpy(gpio_registry[gpio].name, label, GPIO_NAME_SIZE);
+	gpio_registry[gpio].name[GPIO_NAME_SIZE - 1] = 0;
 
-	davinci_configure_pin_mux(&gpio_pinmux[gp], 1);
+	davinci_configure_pin_mux(&gpio_pinmux[gpio], 1);
 
 	return 0;
 }
 
-void gpio_free(int gp)
+int gpio_free(unsigned gpio)
 {
-	gpio_registry[gp].is_registered = 0;
-}
+	if (gpio >= MAX_NUM_GPIOS)
+		return -1;
 
-void gpio_toggle_value(int gp)
-{
-	gpio_set_value(gp, !gpio_get_value(gp));
+	if (!gpio_registry[gpio].is_registered)
+		return -1;
+
+	gpio_registry[gpio].is_registered = 0;
+	gpio_registry[gpio].name[0] = '\0';
+	/* Do not configure as input or change pin mux here */
+	return 0;
 }
 
-int gpio_direction_input(int gp)
+int gpio_direction_input(unsigned gpio)
 {
 	struct davinci_gpio *bank;
 
-	bank = GPIO_BANK(gp);
-	setbits_le32(&bank->dir, 1U << GPIO_BIT(gp));
+	bank = GPIO_BANK(gpio);
+	setbits_le32(&bank->dir, 1U << GPIO_BIT(gpio));
 	return 0;
 }
 
-int gpio_direction_output(int gp, int value)
+int gpio_direction_output(unsigned gpio, int value)
 {
 	struct davinci_gpio *bank;
 
-	bank = GPIO_BANK(gp);
-	clrbits_le32(&bank->dir, 1U << GPIO_BIT(gp));
-	gpio_set_value(gp, value);
+	bank = GPIO_BANK(gpio);
+	clrbits_le32(&bank->dir, 1U << GPIO_BIT(gpio));
+	gpio_set_value(gpio, value);
 	return 0;
 }
 
-int gpio_get_value(int gp)
+int gpio_get_value(unsigned gpio)
 {
 	struct davinci_gpio *bank;
 	unsigned int ip;
 
-	bank = GPIO_BANK(gp);
-	ip = in_le32(&bank->in_data) & (1U << GPIO_BIT(gp));
+	bank = GPIO_BANK(gpio);
+	ip = in_le32(&bank->in_data) & (1U << GPIO_BIT(gpio));
 	return ip ? 1 : 0;
 }
 
-void gpio_set_value(int gp, int value)
+int gpio_set_value(unsigned gpio, int value)
 {
 	struct davinci_gpio *bank;
 
-	bank = GPIO_BANK(gp);
+	bank = GPIO_BANK(gpio);
 
 	if (value)
-		bank->set_data = 1U << GPIO_BIT(gp);
+		bank->set_data = 1U << GPIO_BIT(gpio);
 	else
-		bank->clr_data = 1U << GPIO_BIT(gp);
+		bank->clr_data = 1U << GPIO_BIT(gpio);
+
+	return 0;
 }
 
 void gpio_info(void)
 {
-	int gp, dir, val;
+	unsigned gpio, dir, val;
 	struct davinci_gpio *bank;
 
-	for (gp = 0; gp < MAX_NUM_GPIOS; ++gp) {
-		bank = GPIO_BANK(gp);
-		dir = in_le32(&bank->dir) & (1U << GPIO_BIT(gp));
-		val = gpio_get_value(gp);
+	for (gpio = 0; gpio < MAX_NUM_GPIOS; ++gpio) {
+		bank = GPIO_BANK(gpio);
+		dir = in_le32(&bank->dir) & (1U << GPIO_BIT(gpio));
+		val = gpio_get_value(gpio);
 
 		printf("% 4d: %s: %d [%c] %s\n",
-			gp, dir ? " in" : "out", val,
-			gpio_registry[gp].is_registered ? 'x' : ' ',
-			gpio_registry[gp].name);
+			gpio, dir ? " in" : "out", val,
+			gpio_registry[gpio].is_registered ? 'x' : ' ',
+			gpio_registry[gpio].name);
 	}
 }

drivers/gpio/mvgpio.c

@@ -35,81 +35,79 @@
 #define MV_MAX_GPIO	128
 #endif
 
-int gpio_request(int gp, const char *label)
+int gpio_request(unsigned gpio, const char *label)
 {
-	if (gp >= MV_MAX_GPIO) {
-		printf("%s: Invalid GPIO requested %d\n", __func__, gp);
-		return -EINVAL;
+	if (gpio >= MV_MAX_GPIO) {
+		printf("%s: Invalid GPIO requested %d\n", __func__, gpio);
+		return -1;
 	}
 	return 0;
 }
 
-void gpio_free(int gp)
+int gpio_free(unsigned gpio)
 {
+	return 0;
 }
 
-void gpio_toggle_value(int gp)
-{
-	gpio_set_value(gp, !gpio_get_value(gp));
-}
-
-int gpio_direction_input(int gp)
+int gpio_direction_input(unsigned gpio)
 {
 	struct gpio_reg *gpio_reg_bank;
 
-	if (gp >= MV_MAX_GPIO) {
-		printf("%s: Invalid GPIO %d\n", __func__, gp);
-		return -EINVAL;
+	if (gpio >= MV_MAX_GPIO) {
+		printf("%s: Invalid GPIO %d\n", __func__, gpio);
+		return -1;
 	}
 
-	gpio_reg_bank = get_gpio_base(GPIO_TO_REG(gp));
-	writel(GPIO_TO_BIT(gp), &gpio_reg_bank->gcdr);
+	gpio_reg_bank = get_gpio_base(GPIO_TO_REG(gpio));
+	writel(GPIO_TO_BIT(gpio), &gpio_reg_bank->gcdr);
 	return 0;
 }
 
-int gpio_direction_output(int gp, int value)
+int gpio_direction_output(unsigned gpio, int value)
 {
 	struct gpio_reg *gpio_reg_bank;
 
-	if (gp >= MV_MAX_GPIO) {
-		printf("%s: Invalid GPIO %d\n", __func__, gp);
-		return -EINVAL;
+	if (gpio >= MV_MAX_GPIO) {
+		printf("%s: Invalid GPIO %d\n", __func__, gpio);
+		return -1;
 	}
 
-	gpio_reg_bank = get_gpio_base(GPIO_TO_REG(gp));
-	writel(GPIO_TO_BIT(gp), &gpio_reg_bank->gsdr);
-	gpio_set_value(gp, value);
+	gpio_reg_bank = get_gpio_base(GPIO_TO_REG(gpio));
+	writel(GPIO_TO_BIT(gpio), &gpio_reg_bank->gsdr);
+	gpio_set_value(gpio, value);
 	return 0;
 }
 
-int gpio_get_value(int gp)
+int gpio_get_value(unsigned gpio)
 {
 	struct gpio_reg *gpio_reg_bank;
-	u32 gp_val;
+	u32 gpio_val;
 
-	if (gp >= MV_MAX_GPIO) {
-		printf("%s: Invalid GPIO %d\n", __func__, gp);
-		return -EINVAL;
+	if (gpio >= MV_MAX_GPIO) {
+		printf("%s: Invalid GPIO %d\n", __func__, gpio);
+		return -1;
 	}
 
-	gpio_reg_bank = get_gpio_base(GPIO_TO_REG(gp));
-	gp_val = readl(&gpio_reg_bank->gplr);
+	gpio_reg_bank = get_gpio_base(GPIO_TO_REG(gpio));
+	gpio_val = readl(&gpio_reg_bank->gplr);
 
-	return GPIO_VAL(gp, gp_val);
+	return GPIO_VAL(gpio, gpio_val);
 }
 
-void gpio_set_value(int gp, int value)
+int gpio_set_value(unsigned gpio, int value)
 {
 	struct gpio_reg *gpio_reg_bank;
 
-	if (gp >= MV_MAX_GPIO) {
-		printf("%s: Invalid GPIO %d\n", __func__, gp);
-		return;
+	if (gpio >= MV_MAX_GPIO) {
+		printf("%s: Invalid GPIO %d\n", __func__, gpio);
+		return -1;
 	}
 
-	gpio_reg_bank = get_gpio_base(GPIO_TO_REG(gp));
+	gpio_reg_bank = get_gpio_base(GPIO_TO_REG(gpio));
 	if (value)
-		writel(GPIO_TO_BIT(gp),	&gpio_reg_bank->gpsr);
+		writel(GPIO_TO_BIT(gpio), &gpio_reg_bank->gpsr);
 	else
-		writel(GPIO_TO_BIT(gp),	&gpio_reg_bank->gpcr);
+		writel(GPIO_TO_BIT(gpio), &gpio_reg_bank->gpcr);
+
+	return 0;
 }

drivers/gpio/mxc_gpio.c

@@ -58,7 +58,7 @@ static int mxc_gpio_direction(unsigned int gpio,
 	u32 l;
 
 	if (port >= ARRAY_SIZE(gpio_ports))
-		return -EINVAL;
+		return -1;
 
 	gpio &= 0x1f;
 
@@ -78,14 +78,14 @@ static int mxc_gpio_direction(unsigned int gpio,
 	return 0;
 }
 
-void gpio_set_value(int gpio, int value)
+int gpio_set_value(unsigned gpio, int value)
 {
 	unsigned int port = gpio >> 5;
 	struct gpio_regs *regs;
 	u32 l;
 
 	if (port >= ARRAY_SIZE(gpio_ports))
-		return;
+		return -1;
 
 	gpio &= 0x1f;
 
@@ -97,55 +97,53 @@ void gpio_set_value(int gpio, int value)
 	else
 		l &= ~(1 << gpio);
 	writel(l, &regs->gpio_dr);
+
+	return 0;
 }
 
-int gpio_get_value(int gpio)
+int gpio_get_value(unsigned gpio)
 {
 	unsigned int port = gpio >> 5;
 	struct gpio_regs *regs;
-	u32 l;
+	u32 val;
 
 	if (port >= ARRAY_SIZE(gpio_ports))
-		return -EINVAL;
+		return -1;
 
 	gpio &= 0x1f;
 
 	regs = (struct gpio_regs *)gpio_ports[port];
 
-	l = (readl(&regs->gpio_dr) >> gpio) & 0x01;
+	val = (readl(&regs->gpio_dr) >> gpio) & 0x01;
 
-	return l;
+	return val;
 }
 
-int gpio_request(int gp, const char *label)
+int gpio_request(unsigned gpio, const char *label)
 {
-	unsigned int port = gp >> 5;
+	unsigned int port = gpio >> 5;
 	if (port >= ARRAY_SIZE(gpio_ports))
-		return -EINVAL;
+		return -1;
 	return 0;
 }
 
-void gpio_free(int gp)
+int gpio_free(unsigned gpio)
 {
+	return 0;
 }
 
-void gpio_toggle_value(int gp)
-{
-	gpio_set_value(gp, !gpio_get_value(gp));
-}
-
-int gpio_direction_input(int gp)
+int gpio_direction_input(unsigned gpio)
 {
-	return mxc_gpio_direction(gp, MXC_GPIO_DIRECTION_IN);
+	return mxc_gpio_direction(gpio, MXC_GPIO_DIRECTION_IN);
 }
 
-int gpio_direction_output(int gp, int value)
+int gpio_direction_output(unsigned gpio, int value)
 {
-	int ret = mxc_gpio_direction(gp, MXC_GPIO_DIRECTION_OUT);
+	int ret = mxc_gpio_direction(gpio, MXC_GPIO_DIRECTION_OUT);
 
 	if (ret < 0)
 		return ret;
 
-	gpio_set_value(gp, value);
+	gpio_set_value(gpio, value);
 	return 0;
 }

drivers/gpio/mxs_gpio.c

@@ -69,68 +69,64 @@ void mxs_gpio_init(void)
 	}
 }
 
-int gpio_get_value(int gp)
+int gpio_get_value(unsigned gpio)
 {
-	uint32_t bank = PAD_BANK(gp);
+	uint32_t bank = PAD_BANK(gpio);
 	uint32_t offset = PINCTRL_DIN(bank);
 	struct mx28_register *reg =
 		(struct mx28_register *)(MXS_PINCTRL_BASE + offset);
 
-	return (readl(&reg->reg) >> PAD_PIN(gp)) & 1;
+	return (readl(&reg->reg) >> PAD_PIN(gpio)) & 1;
 }
 
-void gpio_set_value(int gp, int value)
+void gpio_set_value(unsigned gpio, int value)
 {
-	uint32_t bank = PAD_BANK(gp);
+	uint32_t bank = PAD_BANK(gpio);
 	uint32_t offset = PINCTRL_DOUT(bank);
 	struct mx28_register *reg =
 		(struct mx28_register *)(MXS_PINCTRL_BASE + offset);
 
 	if (value)
-		writel(1 << PAD_PIN(gp), &reg->reg_set);
+		writel(1 << PAD_PIN(gpio), &reg->reg_set);
 	else
-		writel(1 << PAD_PIN(gp), &reg->reg_clr);
+		writel(1 << PAD_PIN(gpio), &reg->reg_clr);
 }
 
-int gpio_direction_input(int gp)
+int gpio_direction_input(unsigned gpio)
 {
-	uint32_t bank = PAD_BANK(gp);
+	uint32_t bank = PAD_BANK(gpio);
 	uint32_t offset = PINCTRL_DOE(bank);
 	struct mx28_register *reg =
 		(struct mx28_register *)(MXS_PINCTRL_BASE + offset);
 
-	writel(1 << PAD_PIN(gp), &reg->reg_clr);
+	writel(1 << PAD_PIN(gpio), &reg->reg_clr);
 
 	return 0;
 }
 
-int gpio_direction_output(int gp, int value)
+int gpio_direction_output(unsigned gpio, int value)
 {
-	uint32_t bank = PAD_BANK(gp);
+	uint32_t bank = PAD_BANK(gpio);
 	uint32_t offset = PINCTRL_DOE(bank);
 	struct mx28_register *reg =
 		(struct mx28_register *)(MXS_PINCTRL_BASE + offset);
 
-	writel(1 << PAD_PIN(gp), &reg->reg_set);
+	writel(1 << PAD_PIN(gpio), &reg->reg_set);
 
-	gpio_set_value(gp, value);
+	gpio_set_value(gpio, value);
 
 	return 0;
 }
 
-int gpio_request(int gp, const char *label)
+int gpio_request(unsigned gpio, const char *label)
 {
-	if (PAD_BANK(gp) >= PINCTRL_BANKS)
-		return -EINVAL;
+	if (PAD_BANK(gpio) >= PINCTRL_BANKS)
+		return -1;
 
 	return 0;
 }
 
-void gpio_free(int gp)
+int gpio_free(unsigned gpio)
 {
-}
-
-void gpio_toggle_value(int gp)
-{
-	gpio_set_value(gp, !gpio_get_value(gp));
+	return 0;
 }

drivers/gpio/s5p_gpio.c

@@ -20,7 +20,7 @@
 
 #include <common.h>
 #include <asm/io.h>
-#include <asm/arch/gpio.h>
+#include <asm/gpio.h>
 
 #define CON_MASK(x)		(0xf << ((x) << 2))
 #define CON_SFR(x, v)		((v) << ((x) << 2))
@@ -142,46 +142,55 @@ void s5p_gpio_set_rate(struct s5p_gpio_bank *bank, int gpio, int mode)
 	writel(value, &bank->drv);
 }
 
-struct s5p_gpio_bank *s5p_gpio_get_bank(int nr)
+struct s5p_gpio_bank *s5p_gpio_get_bank(unsigned gpio)
 {
-	int bank = nr / GPIO_PER_BANK;
+	int bank = gpio / GPIO_PER_BANK;
 	bank *= sizeof(struct s5p_gpio_bank);
 
-	return (struct s5p_gpio_bank *) (s5p_gpio_base(nr) + bank);
+	return (struct s5p_gpio_bank *) (s5p_gpio_base(gpio) + bank);
 }
 
-int s5p_gpio_get_pin(int nr)
+int s5p_gpio_get_pin(unsigned gpio)
 {
-	return nr % GPIO_PER_BANK;
+	return gpio % GPIO_PER_BANK;
 }
 
-int gpio_request(int gpio, const char *label)
+/* Common GPIO API */
+
+int gpio_request(unsigned gpio, const char *label)
 {
 	return 0;
 }
 
-int gpio_direction_input(int nr)
+int gpio_free(unsigned gpio)
 {
-	s5p_gpio_direction_input(s5p_gpio_get_bank(nr),
-				s5p_gpio_get_pin(nr));
 	return 0;
 }
 
-int gpio_direction_output(int nr, int value)
+int gpio_direction_input(unsigned gpio)
 {
-	s5p_gpio_direction_output(s5p_gpio_get_bank(nr),
-				 s5p_gpio_get_pin(nr), value);
+	s5p_gpio_direction_input(s5p_gpio_get_bank(gpio),
+				s5p_gpio_get_pin(gpio));
 	return 0;
 }
 
-int gpio_get_value(int nr)
+int gpio_direction_output(unsigned gpio, int value)
 {
-	return (int) s5p_gpio_get_value(s5p_gpio_get_bank(nr),
-				       s5p_gpio_get_pin(nr));
+	s5p_gpio_direction_output(s5p_gpio_get_bank(gpio),
+				 s5p_gpio_get_pin(gpio), value);
+	return 0;
 }
 
-void gpio_set_value(int nr, int value)
+int gpio_get_value(unsigned gpio)
 {
-	s5p_gpio_set_value(s5p_gpio_get_bank(nr),
-			  s5p_gpio_get_pin(nr), value);
+	return (int) s5p_gpio_get_value(s5p_gpio_get_bank(gpio),
+				       s5p_gpio_get_pin(gpio));
+}
+
+int gpio_set_value(unsigned gpio, int value)
+{
+	s5p_gpio_set_value(s5p_gpio_get_bank(gpio),
+			  s5p_gpio_get_pin(gpio), value);
+
+	return 0;
 }

drivers/gpio/tegra2_gpio.c

@@ -49,188 +49,192 @@ static char *get_name(int i)
 	return *gpio_names[i].name ? gpio_names[i].name : "UNKNOWN";
 }
 
-/* Return config of pin 'gp' as GPIO (1) or SFPIO (0) */
-static int get_config(int gp)
+/* Return config of pin 'gpio' as GPIO (1) or SFPIO (0) */
+static int get_config(unsigned gpio)
 {
-	struct gpio_ctlr *gpio = (struct gpio_ctlr *)NV_PA_GPIO_BASE;
-	struct gpio_ctlr_bank *bank = &gpio->gpio_bank[GPIO_BANK(gp)];
+	struct gpio_ctlr *ctlr = (struct gpio_ctlr *)NV_PA_GPIO_BASE;
+	struct gpio_ctlr_bank *bank = &ctlr->gpio_bank[GPIO_BANK(gpio)];
 	u32 u;
 	int type;
 
-	u = readl(&bank->gpio_config[GPIO_PORT(gp)]);
-	type =  (u >> GPIO_BIT(gp)) & 1;
+	u = readl(&bank->gpio_config[GPIO_PORT(gpio)]);
+	type =  (u >> GPIO_BIT(gpio)) & 1;
 
 	debug("get_config: port = %d, bit = %d is %s\n",
-		GPIO_FULLPORT(gp), GPIO_BIT(gp), type ? "GPIO" : "SFPIO");
+		GPIO_FULLPORT(gpio), GPIO_BIT(gpio), type ? "GPIO" : "SFPIO");
 
 	return type;
 }
 
-/* Config pin 'gp' as GPIO or SFPIO, based on 'type' */
-static void set_config(int gp, int type)
+/* Config pin 'gpio' as GPIO or SFPIO, based on 'type' */
+static void set_config(unsigned gpio, int type)
 {
-	struct gpio_ctlr *gpio = (struct gpio_ctlr *)NV_PA_GPIO_BASE;
-	struct gpio_ctlr_bank *bank = &gpio->gpio_bank[GPIO_BANK(gp)];
+	struct gpio_ctlr *ctlr = (struct gpio_ctlr *)NV_PA_GPIO_BASE;
+	struct gpio_ctlr_bank *bank = &ctlr->gpio_bank[GPIO_BANK(gpio)];
 	u32 u;
 
 	debug("set_config: port = %d, bit = %d, %s\n",
-		GPIO_FULLPORT(gp), GPIO_BIT(gp), type ? "GPIO" : "SFPIO");
+		GPIO_FULLPORT(gpio), GPIO_BIT(gpio), type ? "GPIO" : "SFPIO");
 
-	u = readl(&bank->gpio_config[GPIO_PORT(gp)]);
+	u = readl(&bank->gpio_config[GPIO_PORT(gpio)]);
 	if (type)				/* GPIO */
-		u |= 1 << GPIO_BIT(gp);
+		u |= 1 << GPIO_BIT(gpio);
 	else
-		u &= ~(1 << GPIO_BIT(gp));
-	writel(u, &bank->gpio_config[GPIO_PORT(gp)]);
+		u &= ~(1 << GPIO_BIT(gpio));
+	writel(u, &bank->gpio_config[GPIO_PORT(gpio)]);
 }
 
-/* Return GPIO pin 'gp' direction - 0 = input or 1 = output */
-static int get_direction(int gp)
+/* Return GPIO pin 'gpio' direction - 0 = input or 1 = output */
+static int get_direction(unsigned gpio)
 {
-	struct gpio_ctlr *gpio = (struct gpio_ctlr *)NV_PA_GPIO_BASE;
-	struct gpio_ctlr_bank *bank = &gpio->gpio_bank[GPIO_BANK(gp)];
+	struct gpio_ctlr *ctlr = (struct gpio_ctlr *)NV_PA_GPIO_BASE;
+	struct gpio_ctlr_bank *bank = &ctlr->gpio_bank[GPIO_BANK(gpio)];
 	u32 u;
 	int dir;
 
-	u = readl(&bank->gpio_dir_out[GPIO_PORT(gp)]);
-	dir =  (u >> GPIO_BIT(gp)) & 1;
+	u = readl(&bank->gpio_dir_out[GPIO_PORT(gpio)]);
+	dir =  (u >> GPIO_BIT(gpio)) & 1;
 
 	debug("get_direction: port = %d, bit = %d, %s\n",
-		GPIO_FULLPORT(gp), GPIO_BIT(gp), dir ? "OUT" : "IN");
+		GPIO_FULLPORT(gpio), GPIO_BIT(gpio), dir ? "OUT" : "IN");
 
 	return dir;
 }
 
-/* Config GPIO pin 'gp' as input or output (OE) as per 'output' */
-static void set_direction(int gp, int output)
+/* Config GPIO pin 'gpio' as input or output (OE) as per 'output' */
+static void set_direction(unsigned gpio, int output)
 {
-	struct gpio_ctlr *gpio = (struct gpio_ctlr *)NV_PA_GPIO_BASE;
-	struct gpio_ctlr_bank *bank = &gpio->gpio_bank[GPIO_BANK(gp)];
+	struct gpio_ctlr *ctlr = (struct gpio_ctlr *)NV_PA_GPIO_BASE;
+	struct gpio_ctlr_bank *bank = &ctlr->gpio_bank[GPIO_BANK(gpio)];
 	u32 u;
 
 	debug("set_direction: port = %d, bit = %d, %s\n",
-		GPIO_FULLPORT(gp), GPIO_BIT(gp), output ? "OUT" : "IN");
+		GPIO_FULLPORT(gpio), GPIO_BIT(gpio), output ? "OUT" : "IN");
 
-	u = readl(&bank->gpio_dir_out[GPIO_PORT(gp)]);
+	u = readl(&bank->gpio_dir_out[GPIO_PORT(gpio)]);
 	if (output)
-		u |= 1 << GPIO_BIT(gp);
+		u |= 1 << GPIO_BIT(gpio);
 	else
-		u &= ~(1 << GPIO_BIT(gp));
-	writel(u, &bank->gpio_dir_out[GPIO_PORT(gp)]);
+		u &= ~(1 << GPIO_BIT(gpio));
+	writel(u, &bank->gpio_dir_out[GPIO_PORT(gpio)]);
 }
 
-/* set GPIO pin 'gp' output bit as 0 or 1 as per 'high' */
-static void set_level(int gp, int high)
+/* set GPIO pin 'gpio' output bit as 0 or 1 as per 'high' */
+static void set_level(unsigned gpio, int high)
 {
-	struct gpio_ctlr *gpio = (struct gpio_ctlr *)NV_PA_GPIO_BASE;
-	struct gpio_ctlr_bank *bank = &gpio->gpio_bank[GPIO_BANK(gp)];
+	struct gpio_ctlr *ctlr = (struct gpio_ctlr *)NV_PA_GPIO_BASE;
+	struct gpio_ctlr_bank *bank = &ctlr->gpio_bank[GPIO_BANK(gpio)];
 	u32 u;
 
 	debug("set_level: port = %d, bit %d == %d\n",
-		GPIO_FULLPORT(gp), GPIO_BIT(gp), high);
+		GPIO_FULLPORT(gpio), GPIO_BIT(gpio), high);
 
-	u = readl(&bank->gpio_out[GPIO_PORT(gp)]);
+	u = readl(&bank->gpio_out[GPIO_PORT(gpio)]);
 	if (high)
-		u |= 1 << GPIO_BIT(gp);
+		u |= 1 << GPIO_BIT(gpio);
 	else
-		u &= ~(1 << GPIO_BIT(gp));
-	writel(u, &bank->gpio_out[GPIO_PORT(gp)]);
+		u &= ~(1 << GPIO_BIT(gpio));
+	writel(u, &bank->gpio_out[GPIO_PORT(gpio)]);
 }
 
 /*
  * Generic_GPIO primitives.
  */
 
-int gpio_request(int gp, const char *label)
+int gpio_request(unsigned gpio, const char *label)
 {
-	if (gp >= MAX_NUM_GPIOS)
+	if (gpio >= MAX_NUM_GPIOS)
 		return -1;
 
 	if (label != NULL) {
-		strncpy(gpio_names[gp].name, label, GPIO_NAME_SIZE);
-		gpio_names[gp].name[GPIO_NAME_SIZE - 1] = '\0';
+		strncpy(gpio_names[gpio].name, label, GPIO_NAME_SIZE);
+		gpio_names[gpio].name[GPIO_NAME_SIZE - 1] = '\0';
 	}
 
 	/* Configure as a GPIO */
-	set_config(gp, 1);
+	set_config(gpio, 1);
 
 	return 0;
 }
 
-void gpio_free(int gp)
+int gpio_free(unsigned gpio)
 {
+	if (gpio >= MAX_NUM_GPIOS)
+		return -1;
+
+	gpio_names[gpio].name[0] = '\0';
+	/* Do not configure as input or change pin mux here */
+	return 0;
 }
 
-/* read GPIO OUT value of pin 'gp' */
-static int gpio_get_output_value(int gp)
+/* read GPIO OUT value of pin 'gpio' */
+static int gpio_get_output_value(unsigned gpio)
 {
-	struct gpio_ctlr *gpio = (struct gpio_ctlr *)NV_PA_GPIO_BASE;
-	struct gpio_ctlr_bank *bank = &gpio->gpio_bank[GPIO_BANK(gp)];
+	struct gpio_ctlr *ctlr = (struct gpio_ctlr *)NV_PA_GPIO_BASE;
+	struct gpio_ctlr_bank *bank = &ctlr->gpio_bank[GPIO_BANK(gpio)];
 	int val;
 
 	debug("gpio_get_output_value: pin = %d (port %d:bit %d)\n",
-		gp, GPIO_FULLPORT(gp), GPIO_BIT(gp));
+		gpio, GPIO_FULLPORT(gpio), GPIO_BIT(gpio));
 
-	val = readl(&bank->gpio_out[GPIO_PORT(gp)]);
+	val = readl(&bank->gpio_out[GPIO_PORT(gpio)]);
 
-	return (val >> GPIO_BIT(gp)) & 1;
+	return (val >> GPIO_BIT(gpio)) & 1;
 }
 
-void gpio_toggle_value(int gp)
-{
-	gpio_set_value(gp, !gpio_get_output_value(gp));
-}
-
-/* set GPIO pin 'gp' as an input */
-int gpio_direction_input(int gp)
+/* set GPIO pin 'gpio' as an input */
+int gpio_direction_input(unsigned gpio)
 {
 	debug("gpio_direction_input: pin = %d (port %d:bit %d)\n",
-		gp, GPIO_FULLPORT(gp), GPIO_BIT(gp));
+		gpio, GPIO_FULLPORT(gpio), GPIO_BIT(gpio));
 
 	/* Configure GPIO direction as input. */
-	set_direction(gp, 0);
+	set_direction(gpio, 0);
 
 	return 0;
 }
 
-/* set GPIO pin 'gp' as an output, with polarity 'value' */
-int gpio_direction_output(int gp, int value)
+/* set GPIO pin 'gpio' as an output, with polarity 'value' */
+int gpio_direction_output(unsigned gpio, int value)
 {
 	debug("gpio_direction_output: pin = %d (port %d:bit %d) = %s\n",
-		gp, GPIO_FULLPORT(gp), GPIO_BIT(gp), value ? "HIGH" : "LOW");
+		gpio, GPIO_FULLPORT(gpio), GPIO_BIT(gpio),
+		value ? "HIGH" : "LOW");
 
 	/* Configure GPIO output value. */
-	set_level(gp, value);
+	set_level(gpio, value);
 
 	/* Configure GPIO direction as output. */
-	set_direction(gp, 1);
+	set_direction(gpio, 1);
 
 	return 0;
 }
 
-/* read GPIO IN value of pin 'gp' */
-int gpio_get_value(int gp)
+/* read GPIO IN value of pin 'gpio' */
+int gpio_get_value(unsigned gpio)
 {
-	struct gpio_ctlr *gpio = (struct gpio_ctlr *)NV_PA_GPIO_BASE;
-	struct gpio_ctlr_bank *bank = &gpio->gpio_bank[GPIO_BANK(gp)];
+	struct gpio_ctlr *ctlr = (struct gpio_ctlr *)NV_PA_GPIO_BASE;
+	struct gpio_ctlr_bank *bank = &ctlr->gpio_bank[GPIO_BANK(gpio)];
 	int val;
 
 	debug("gpio_get_value: pin = %d (port %d:bit %d)\n",
-		gp, GPIO_FULLPORT(gp), GPIO_BIT(gp));
+		gpio, GPIO_FULLPORT(gpio), GPIO_BIT(gpio));
 
-	val = readl(&bank->gpio_in[GPIO_PORT(gp)]);
+	val = readl(&bank->gpio_in[GPIO_PORT(gpio)]);
 
-	return (val >> GPIO_BIT(gp)) & 1;
+	return (val >> GPIO_BIT(gpio)) & 1;
 }
 
-/* write GPIO OUT value to pin 'gp' */
-void gpio_set_value(int gp, int value)
+/* write GPIO OUT value to pin 'gpio' */
+int gpio_set_value(unsigned gpio, int value)
 {
 	debug("gpio_set_value: pin = %d (port %d:bit %d), value = %d\n",
-		gp, GPIO_FULLPORT(gp), GPIO_BIT(gp), value);
+		gpio, GPIO_FULLPORT(gpio), GPIO_BIT(gpio), value);
 
 	/* Configure GPIO output value. */
-	set_level(gp, value);
+	set_level(gpio, value);
+
+	return 0;
 }
 
 /*
@@ -238,7 +242,8 @@ void gpio_set_value(int gp, int value)
  */
 void gpio_info(void)
 {
-	int c, type;
+	unsigned c;
+	int type;
 
 	for (c = 0; c < MAX_NUM_GPIOS; c++) {
 		type = get_config(c);		/* GPIO, not SFPIO */