ARMv7: De-uboot-ify Exynos5250 code

When starting the Exynos5250 port, a lot of unneeded u-boot code
was imported. This is an attempt to get rid of a lot of unneeded
code before the port is used as a basis for further ARM ports.

There is a lot more that can be done, including cleaning up the
5250's Kconfig file.

Change-Id: I2d88676c436eea4b21bcb62f40018af9fabb3016
Signed-off-by: Stefan Reinauer <reinauer@google.com>
Signed-off-by: Gabe Black <gabeblack@chromium.org>
Reviewed-on: http://review.coreboot.org/3642
Tested-by: build bot (Jenkins)
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>

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_ */