arm/km: use spi claim bus to switch between SPI and NAND

We overwrite these weak functions from the kirkwood spi code to
use our own method to be able to switch between the SPI NOR and
the NAND flash. This is needed e.g. to update the u-boot. The former
command do_spi_toggle can therefore be removed. And the usage of
this command is removed from the u-boot update command in the
u-boot environment.

Signed-off-by: Valentin Longchamp <valentin.longchamp@keymile.com>
Signed-off-by: Prafulla Wadaskar <prafulla@marvell.com>
cc: Holger Brunck <holger.brunck@keymile.com>
cc: Prafulla Wadaskar <prafulla@marvell.com>

board/keymile/km_arm/km_arm.c

@@ -33,6 +33,7 @@
 #include <nand.h>
 #include <netdev.h>
 #include <miiphy.h>
+#include <spi.h>
 #include <asm/io.h>
 #include <asm/arch/cpu.h>
 #include <asm/arch/kirkwood.h>
@@ -284,48 +285,17 @@ int board_init(void)
 	return 0;
 }
 
-#if defined(CONFIG_CMD_SF)
-int do_spi_toggle(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
+int board_spi_claim_bus(struct spi_slave *slave)
 {
-	u32 tmp;
-	if (argc < 2)
-		return cmd_usage(cmdtp);
-
-	if ((strcmp(argv[1], "off") == 0)) {
-		printf("SPI FLASH disabled, NAND enabled\n");
-		/* Multi-Purpose Pins Functionality configuration */
-		kwmpp_config[0] = MPP0_NF_IO2;
-		kwmpp_config[1] = MPP1_NF_IO3;
-		kwmpp_config[2] = MPP2_NF_IO4;
-		kwmpp_config[3] = MPP3_NF_IO5;
-
-		kirkwood_mpp_conf(kwmpp_config, NULL);
-		tmp = readl(KW_GPIO0_BASE);
-		writel(tmp | FLASH_GPIO_PIN , KW_GPIO0_BASE);
-	} else if ((strcmp(argv[1], "on") == 0)) {
-		printf("SPI FLASH enabled, NAND disabled\n");
-		/* Multi-Purpose Pins Functionality configuration */
-		kwmpp_config[0] = MPP0_SPI_SCn;
-		kwmpp_config[1] = MPP1_SPI_MOSI;
-		kwmpp_config[2] = MPP2_SPI_SCK;
-		kwmpp_config[3] = MPP3_SPI_MISO;
-
-		kirkwood_mpp_conf(kwmpp_config, NULL);
-		tmp = readl(KW_GPIO0_BASE);
-		writel(tmp & (~FLASH_GPIO_PIN) , KW_GPIO0_BASE);
-	} else {
-		return cmd_usage(cmdtp);
-	}
+	kw_gpio_set_value(KM_FLASH_GPIO_PIN, 0);
 
 	return 0;
 }
 
-U_BOOT_CMD(
-	spitoggle,	2,	0,	do_spi_toggle,
-	"En-/disable SPI FLASH access",
-	"<on|off> - Enable (on) or disable (off) SPI FLASH access\n"
-	);
-#endif
+void board_spi_release_bus(struct spi_slave *slave)
+{
+	kw_gpio_set_value(KM_FLASH_GPIO_PIN, 1);
+}
 
 int dram_init(void)
 {

include/configs/km/km_arm.h

@@ -227,7 +227,11 @@ int get_scl(void);
 #define CONFIG_SPI_FLASH
 #define CONFIG_SPI_FLASH_STMICRO
 
+/* SPI bus claim MPP configuration */
+#define CONFIG_SYS_KW_SPI_MPP	0x0
+
 #define FLASH_GPIO_PIN			0x00010000
+#define KM_FLASH_GPIO_PIN	16
 
 #ifndef MTDIDS_DEFAULT
 # define MTDIDS_DEFAULT		"nand0=orion_nand"
@@ -241,9 +245,8 @@ int get_scl(void);
 
 #define	CONFIG_KM_UPDATE_UBOOT						\
 	"update="							\
-		"spi on;sf probe 0;sf erase 0 +${filesize};"		\
-		"sf write ${load_addr_r} 0 ${filesize};"		\
-		"spi off\0"
+		"sf probe 0;sf erase 0 +${filesize};"			\
+		"sf write ${load_addr_r} 0 ${filesize};\0"
 
 /*
  * Default environment variables