[U-Boot] [PATCH v2] arm:exynos4:universal_c210: implement software SPI

[Piotr Wilczek]

This patch implements software SPI for the universal C210 board.

Signed-off-by: Piotr Wilczek <p.wilczek at samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park at samsung.com>
CC: Minkyu Kang <mk7.kang at samsung.com>
CC: Wolfgang Denk <wd at denx.de>
CC: Jean-Christophe PLAGNIOL-VILLARD <plagnioj at jcrosoft.com>
---
Changes in v2:
- removed space between # and include;
- changed return in spi_cs_is_valid function;

 board/samsung/universal_c210/universal.c |   35 ++++++++++++++++++++++++++++++
 drivers/spi/soft_spi.c                   |    7 +++++-
 include/configs/s5pc210_universal.h      |   19 ++++++++++++++++
 3 files changed, 60 insertions(+), 1 deletions(-)

diff --git a/board/samsung/universal_c210/universal.c b/board/samsung/universal_c210/universal.c
index ded97ca..6947e83 100644
--- a/board/samsung/universal_c210/universal.c
+++ b/board/samsung/universal_c210/universal.c
@@ -24,6 +24,7 @@
 
 #include <common.h>
 #include <asm/io.h>
+#include <spi.h>
 #include <asm/arch/adc.h>
 #include <asm/arch/gpio.h>
 #include <asm/arch/mmc.h>
@@ -33,6 +34,9 @@
 #include <asm/arch/cpu.h>
 #include <max8998_pmic.h>
 #include <asm/arch/watchdog.h>
+#if defined(CONFIG_SOFT_SPI)
+# include <asm/gpio.h>
+#endif
 
 DECLARE_GLOBAL_DATA_PTR;
 
@@ -284,3 +288,34 @@ int board_early_init_f(void)
 
 	return 0;
 }
+
+void soft_spi_init()
+{
+	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;
+}
+
diff --git a/drivers/spi/soft_spi.c b/drivers/spi/soft_spi.c
index 13df8cb..a0a3012 100644
--- a/drivers/spi/soft_spi.c
+++ b/drivers/spi/soft_spi.c
@@ -29,6 +29,10 @@
 
 #include <malloc.h>
 
+#if defined(CONFIG_SOFT_SPI)
+# include <asm/gpio.h>
+#endif
+
 /*-----------------------------------------------------------------------
  * Definitions
  */
@@ -59,8 +63,9 @@ static inline struct soft_spi_slave *to_soft_spi(struct spi_slave *slave)
 void spi_init (void)
 {
 #ifdef	SPI_INIT
+#ifdef CONFIG_SYS_IMMR
 	volatile immap_t *immr = (immap_t *)CONFIG_SYS_IMMR;
-
+#endif
 	SPI_INIT;
 #endif
 }
diff --git a/include/configs/s5pc210_universal.h b/include/configs/s5pc210_universal.h
index 46f2663..f7a7443 100644
--- a/include/configs/s5pc210_universal.h
+++ b/include/configs/s5pc210_universal.h
@@ -264,4 +264,23 @@
 #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)
+#define SPI_INIT soft_spi_init()
+#define SPI_SCL(bit) gpio_set_value(CONFIG_SOFT_SPI_GPIO_SCLK, bit)
+#define SPI_SDA(bit) gpio_set_value(CONFIG_SOFT_SPI_GPIO_MOSI, bit)
+#define SPI_READ gpio_get_value(CONFIG_SOFT_SPI_GPIO_MISO)
+#ifndef	__ASSEMBLY__
+void soft_spi_init(void);
+#endif
+
 #endif	/* __CONFIG_H */
-- 
1.7.5.4