From ff0fedd58529e50e972d6b983c52c54a062f8c75 Mon Sep 17 00:00:00 2001
From: Piotr Wilczek <p.wilczek@samsung.com>
Date: Fri, 19 Oct 2012 05:34:03 +0000
Subject: [PATCH] exynos4: universal_C210: use software SPI

This patch use software spi on Samsung Universal C210 board.

Signed-off-by: Piotr Wilczek <p.wilczek@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
Signed-off-by: Minkyu Kang <mk7.kang@samsung.com>
---
 board/samsung/universal_c210/universal.c | 87 +++++++++++++++++++-----
 include/configs/s5pc210_universal.h      | 21 ++++++
 2 files changed, 90 insertions(+), 18 deletions(-)

diff --git a/board/samsung/universal_c210/universal.c b/board/samsung/universal_c210/universal.c
index ded97ca312..4c1163e9bb 100644
--- a/board/samsung/universal_c210/universal.c
+++ b/board/samsung/universal_c210/universal.c
@@ -23,7 +23,9 @@
  */
 
 #include <common.h>
+#include <spi.h>
 #include <asm/io.h>
+#include <asm/gpio.h>
 #include <asm/arch/adc.h>
 #include <asm/arch/gpio.h>
 #include <asm/arch/mmc.h>
@@ -52,24 +54,6 @@ static int get_hwrev(void)
 
 static void check_hw_revision(void);
 
-int board_init(void)
-{
-	gpio1 = (struct exynos4_gpio_part1 *) EXYNOS4_GPIO_PART1_BASE;
-	gpio2 = (struct exynos4_gpio_part2 *) EXYNOS4_GPIO_PART2_BASE;
-
-	gd->bd->bi_arch_number = MACH_TYPE_UNIVERSAL_C210;
-	gd->bd->bi_boot_params = PHYS_SDRAM_1 + 0x100;
-
-#if defined(CONFIG_PMIC)
-	pmic_init();
-#endif
-
-	check_hw_revision();
-	printf("HW Revision:\t0x%x\n", board_rev);
-
-	return 0;
-}
-
 int dram_init(void)
 {
 	gd->ram_size = get_ram_size((long *)PHYS_SDRAM_1, PHYS_SDRAM_1_SIZE) +
@@ -284,3 +268,70 @@ int board_early_init_f(void)
 
 	return 0;
 }
+
+#ifdef CONFIG_SOFT_SPI
+static void soft_spi_init(void)
+{
+	gpio_direction_output(CONFIG_SOFT_SPI_GPIO_SCLK,
+		CONFIG_SOFT_SPI_MODE & SPI_CPOL);
+	gpio_direction_output(CONFIG_SOFT_SPI_GPIO_MOSI, 1);
+	gpio_direction_input(CONFIG_SOFT_SPI_GPIO_MISO);
+	gpio_direction_output(CONFIG_SOFT_SPI_GPIO_CS,
+		!(CONFIG_SOFT_SPI_MODE & SPI_CS_HIGH));
+}
+
+void spi_cs_activate(struct spi_slave *slave)
+{
+	gpio_set_value(CONFIG_SOFT_SPI_GPIO_CS,
+		!(CONFIG_SOFT_SPI_MODE & SPI_CS_HIGH));
+	SPI_SCL(1);
+	gpio_set_value(CONFIG_SOFT_SPI_GPIO_CS,
+		CONFIG_SOFT_SPI_MODE & SPI_CS_HIGH);
+}
+
+void spi_cs_deactivate(struct spi_slave *slave)
+{
+	gpio_set_value(CONFIG_SOFT_SPI_GPIO_CS,
+		!(CONFIG_SOFT_SPI_MODE & SPI_CS_HIGH));
+}
+
+int  spi_cs_is_valid(unsigned int bus, unsigned int cs)
+{
+	return bus == 0 && cs == 0;
+}
+
+void universal_spi_scl(int bit)
+{
+	gpio_set_value(CONFIG_SOFT_SPI_GPIO_SCLK, bit);
+}
+
+void universal_spi_sda(int bit)
+{
+	gpio_set_value(CONFIG_SOFT_SPI_GPIO_MOSI, bit);
+}
+
+int universal_spi_read(void)
+{
+	return gpio_get_value(CONFIG_SOFT_SPI_GPIO_MISO);
+}
+#endif
+
+int board_init(void)
+{
+	gpio1 = (struct exynos4_gpio_part1 *) EXYNOS4_GPIO_PART1_BASE;
+	gpio2 = (struct exynos4_gpio_part2 *) EXYNOS4_GPIO_PART2_BASE;
+
+	gd->bd->bi_arch_number = MACH_TYPE_UNIVERSAL_C210;
+	gd->bd->bi_boot_params = PHYS_SDRAM_1 + 0x100;
+
+#if defined(CONFIG_PMIC)
+	pmic_init();
+#endif
+#ifdef CONFIG_SOFT_SPI
+	soft_spi_init();
+#endif
+	check_hw_revision();
+	printf("HW Revision:\t0x%x\n", board_rev);
+
+	return 0;
+}
diff --git a/include/configs/s5pc210_universal.h b/include/configs/s5pc210_universal.h
index 07849fb1b2..54ee8c4ba0 100644
--- a/include/configs/s5pc210_universal.h
+++ b/include/configs/s5pc210_universal.h
@@ -263,4 +263,25 @@
 #define CONFIG_USB_GADGET_S3C_UDC_OTG
 #define CONFIG_USB_GADGET_DUALSPEED
 
+/*
+ * SPI Settings
+ */
+#define CONFIG_SOFT_SPI
+#define CONFIG_SOFT_SPI_MODE SPI_MODE_3
+#define CONFIG_SOFT_SPI_GPIO_SCLK exynos4_gpio_part2_get_nr(y3, 1)
+#define CONFIG_SOFT_SPI_GPIO_MOSI exynos4_gpio_part2_get_nr(y3, 3)
+#define CONFIG_SOFT_SPI_GPIO_MISO exynos4_gpio_part2_get_nr(y3, 0)
+#define CONFIG_SOFT_SPI_GPIO_CS exynos4_gpio_part2_get_nr(y4, 3)
+
+#define SPI_DELAY udelay(1)
+#undef SPI_INIT
+#define SPI_SCL(bit) universal_spi_scl(bit)
+#define SPI_SDA(bit) universal_spi_sda(bit)
+#define SPI_READ universal_spi_read()
+#ifndef	__ASSEMBLY__
+void universal_spi_scl(int bit);
+void universal_spi_sda(int bit);
+int universal_spi_read(void);
+#endif
+
 #endif	/* __CONFIG_H */
-- 
2.25.1