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Diffstat (limited to 'src/cpu/samsung/exynos5250/gpio.h')
-rw-r--r--src/cpu/samsung/exynos5250/gpio.h236
1 files changed, 96 insertions, 140 deletions
diff --git a/src/cpu/samsung/exynos5250/gpio.h b/src/cpu/samsung/exynos5250/gpio.h
index 70e7f2d458..e70c653e85 100644
--- a/src/cpu/samsung/exynos5250/gpio.h
+++ b/src/cpu/samsung/exynos5250/gpio.h
@@ -1,11 +1,11 @@
/*
- * (C) Copyright 2010 Samsung Electronics
- * Minkyu Kang <mk7.kang@samsung.com>
+ * This file is part of the coreboot 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.
+ * Copyright (C) 2010 Samsung Electronics
+ *
+ * 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; version 2 of the License.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
@@ -14,14 +14,11 @@
*
* 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
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
-#ifndef EXYNOS5250_GPIO_H_
-#define EXYNOS5250_GPIO_H_
-
-#include <cpu/samsung/exynos5250/cpu.h> /* FIXME: for S5PC110_GPIO_BASE */
+#ifndef CPU_SAMSUNG_EXYNOS5250_GPIO_H
+#define CPU_SAMSUNG_EXYNOS5250_GPIO_H
struct s5p_gpio_bank {
unsigned int con;
@@ -33,99 +30,6 @@ struct s5p_gpio_bank {
unsigned char res1[8];
};
-struct s5pc100_gpio {
- struct s5p_gpio_bank a0;
- struct s5p_gpio_bank a1;
- struct s5p_gpio_bank b;
- struct s5p_gpio_bank c;
- struct s5p_gpio_bank d;
- struct s5p_gpio_bank e0;
- struct s5p_gpio_bank e1;
- struct s5p_gpio_bank f0;
- struct s5p_gpio_bank f1;
- struct s5p_gpio_bank f2;
- struct s5p_gpio_bank f3;
- struct s5p_gpio_bank g0;
- struct s5p_gpio_bank g1;
- struct s5p_gpio_bank g2;
- struct s5p_gpio_bank g3;
- struct s5p_gpio_bank i;
- struct s5p_gpio_bank j0;
- struct s5p_gpio_bank j1;
- struct s5p_gpio_bank j2;
- struct s5p_gpio_bank j3;
- struct s5p_gpio_bank j4;
- struct s5p_gpio_bank k0;
- struct s5p_gpio_bank k1;
- struct s5p_gpio_bank k2;
- struct s5p_gpio_bank k3;
- struct s5p_gpio_bank l0;
- struct s5p_gpio_bank l1;
- struct s5p_gpio_bank l2;
- struct s5p_gpio_bank l3;
- struct s5p_gpio_bank l4;
- struct s5p_gpio_bank h0;
- struct s5p_gpio_bank h1;
- struct s5p_gpio_bank h2;
- struct s5p_gpio_bank h3;
-};
-
-struct s5pc110_gpio {
- struct s5p_gpio_bank a0;
- struct s5p_gpio_bank a1;
- struct s5p_gpio_bank b;
- struct s5p_gpio_bank c0;
- struct s5p_gpio_bank c1;
- struct s5p_gpio_bank d0;
- struct s5p_gpio_bank d1;
- struct s5p_gpio_bank e0;
- struct s5p_gpio_bank e1;
- struct s5p_gpio_bank f0;
- struct s5p_gpio_bank f1;
- struct s5p_gpio_bank f2;
- struct s5p_gpio_bank f3;
- struct s5p_gpio_bank g0;
- struct s5p_gpio_bank g1;
- struct s5p_gpio_bank g2;
- struct s5p_gpio_bank g3;
- struct s5p_gpio_bank i;
- struct s5p_gpio_bank j0;
- struct s5p_gpio_bank j1;
- struct s5p_gpio_bank j2;
- struct s5p_gpio_bank j3;
- struct s5p_gpio_bank j4;
- struct s5p_gpio_bank mp0_1;
- struct s5p_gpio_bank mp0_2;
- struct s5p_gpio_bank mp0_3;
- struct s5p_gpio_bank mp0_4;
- struct s5p_gpio_bank mp0_5;
- struct s5p_gpio_bank mp0_6;
- struct s5p_gpio_bank mp0_7;
- struct s5p_gpio_bank mp1_0;
- struct s5p_gpio_bank mp1_1;
- struct s5p_gpio_bank mp1_2;
- struct s5p_gpio_bank mp1_3;
- struct s5p_gpio_bank mp1_4;
- struct s5p_gpio_bank mp1_5;
- struct s5p_gpio_bank mp1_6;
- struct s5p_gpio_bank mp1_7;
- struct s5p_gpio_bank mp1_8;
- struct s5p_gpio_bank mp2_0;
- struct s5p_gpio_bank mp2_1;
- struct s5p_gpio_bank mp2_2;
- struct s5p_gpio_bank mp2_3;
- struct s5p_gpio_bank mp2_4;
- struct s5p_gpio_bank mp2_5;
- struct s5p_gpio_bank mp2_6;
- struct s5p_gpio_bank mp2_7;
- struct s5p_gpio_bank mp2_8;
- struct s5p_gpio_bank res1[48];
- struct s5p_gpio_bank h0;
- struct s5p_gpio_bank h1;
- struct s5p_gpio_bank h2;
- struct s5p_gpio_bank h3;
-};
-
/* functions */
void s5p_gpio_cfg_pin(struct s5p_gpio_bank *bank, int gpio, int cfg);
void s5p_gpio_direction_output(struct s5p_gpio_bank *bank, int gpio, int en);
@@ -139,16 +43,6 @@ void s5p_gpio_set_rate(struct s5p_gpio_bank *bank, int gpio, int mode);
/* GPIO pins per bank */
#define GPIO_PER_BANK 8
-static inline unsigned int s5p_gpio_base(int nr)
-{
- return S5PC110_GPIO_BASE;
-}
-
-#define s5pc110_gpio_get_nr(bank, pin) \
- ((((((unsigned int)&(((struct s5pc110_gpio *)S5PC110_GPIO_BASE)->bank))\
- - S5PC110_GPIO_BASE) / sizeof(struct s5p_gpio_bank)) \
- * GPIO_PER_BANK) + pin)
-
/* Pin configurations */
#define GPIO_INPUT 0x0
#define GPIO_OUTPUT 0x1
@@ -685,41 +579,103 @@ void gpio_set_drv(int gpio, int mode);
*/
void gpio_set_rate(int gpio, int mode);
-/* FIXME(dhendrix) use generic arch/gpio.h API instead */
-//int gpio_direction_input(unsigned gpio);
-//int gpio_direction_output(unsigned gpio, int value);
+/*
+ * reads only a single GPIO
+ *
+ * @param gpio GPIO to read
+ * @return -1 if the value cannot be determined. Otherwise returns
+ * the corresponding MVL3 enum value.
+ */
+int gpio_read_mvl3(unsigned gpio);
+
-/**
- * Decode a list of GPIOs into an integer.
+///////////////////////////////
+/*
+ * Generic GPIO API for U-Boot
*
- * TODO(sjg@chromium.org): This could perhaps become a generic function?
+ * GPIOs are numbered from 0 to GPIO_COUNT-1 which value is defined
+ * by the SOC/architecture.
*
- * Each GPIO pin can be put into three states using external resistors:
- * - pulled up
- * - pulled down
- * - not connected
+ * Each GPIO can be an input or output. If an input then its value can
+ * be read as 0 or 1. If an output then its value can be set to 0 or 1.
+ * If you try to write an input then the value is undefined. If you try
+ * to read an output, barring something very unusual, you will get
+ * back the value of the output that you previously set.
*
- * Read each GPIO in turn to produce an integer value. The first GPIO
- * produces a number 1 * (0 to 2), the second produces 3 * (0 to 2), etc.
- * In this way, each GPIO increases the number of possible states by a
- * factor of 3.
+ * In some cases the operation may fail, for example if the GPIO number
+ * is out of range, or the GPIO is not available because its pin is
+ * being used by another function. In that case, functions may return
+ * an error value of -1.
+ */
+
+/**
+ * Make a GPIO an input.
*
- * @param gpio_list List of GPIO numbers to decode
- * @param count Number of GPIOs in list
- * @return -1 if the value cannot be determined, or any GPIO number is
- * invalid. Otherwise returns the calculated value
+ * @param gpio GPIO number
+ * @return 0 if ok, -1 on error
*/
-int gpio_decode_number(unsigned gpio_list[], int count);
+int gpio_direction_input(unsigned gpio);
-/*
- * similar to gpio_decode_number, but reads only a single GPIO
+/**
+ * Make a GPIO an output, and set its value.
*
- * @param gpio GPIO to read
- * @return -1 if the value cannot be determined. Otherwise returns
- * the corresponding MVL3 enum value.
+ * @param gpio GPIO number
+ * @param value GPIO value (0 for low or 1 for high)
+ * @return 0 if ok, -1 on error
*/
-int gpio_read_mvl3(unsigned gpio);
+int gpio_direction_output(unsigned gpio, int value);
+
+/**
+ * Get a GPIO's value. This will work whether the GPIO is an input
+ * or an output.
+ *
+ * @param gpio GPIO number
+ * @return 0 if low, 1 if high, -1 on error
+ */
+int gpio_get_value(unsigned gpio);
+
+/**
+ * Set an output GPIO's value. The GPIO must already be an output or
+ * this function may have no effect.
+ *
+ * @param gpio GPIO number
+ * @param value GPIO value (0 for low or 1 for high)
+ * @return 0 if ok, -1 on error
+ */
+int gpio_set_value(unsigned gpio, int value);
+
+
+///////////////////////////////
+
void gpio_info(void);
+enum gpio_types {
+ GPIO_IN,
+ GPIO_OUT,
+ GPIO_ALT, /* catch-all for alternate functions */
+};
+
+/*
+ * Many-value logic (3 states). This can be used for inputs whereby presence
+ * of external pull-up or pull-down resistors can be added to overcome internal
+ * pull-ups/pull-downs and force a single value.
+ *
+ * Thus, external pull resistors can force a 0 or 1 and if the value changes
+ * along with internal pull-up/down enable then the input is floating.
+ *
+ * Vpd | Vpu | MVL
+ * -----------------
+ * 0 | 0 | 0
+ * -----------------
+ * 0 | 1 | Z <-- floating input will follow internal pull up/down
+ * -----------------
+ * 1 | 1 | 1
+ */
+enum mvl3 {
+ LOGIC_0,
+ LOGIC_1,
+ LOGIC_Z, /* high impedence / tri-stated / floating */
+};
+
#endif /* EXYNOS5250_GPIO_H_ */
generated by cgit v1.2.3 (git 2.39.1) at 2024-07-09 03:30:17 +0000