MIPS: ath79: add common SPI controller device

Several boards are using the built-in SPI controller of the
AR71XX/AR724X/AR913X SoCs. This patch adds common platform_device
and helper code to register it. Additionally, the patch registers
the SPI bus on the PB44 board.

Signed-off-by: Gabor Juhos <juhosg@openwrt.org>
Cc: linux-mips@linux-mips.org
Cc: Imre Kaloz <kaloz@openwrt.org>
Cc: Luis R. Rodriguez <lrodriguez@atheros.com>
Cc: Cliff Holden <Cliff.Holden@Atheros.com>
Cc: Kathy Giori <Kathy.Giori@Atheros.com>
Patchwork: https://patchwork.linux-mips.org/patch/1956/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

6 files changed, 84 insertions, 0 deletions

diff --git a/arch/mips/ath79/Kconfig b/arch/mips/ath79/Kconfig
index 185a8d6c73de..cd6c738a916c 100644
--- a/arch/mips/ath79/Kconfig
+++ b/arch/mips/ath79/Kconfig
@@ -7,6 +7,7 @@ config ATH79_MACH_PB44
         select SOC_AR71XX
         select ATH79_DEV_GPIO_BUTTONS
         select ATH79_DEV_LEDS_GPIO
+        select ATH79_DEV_SPI
         help
           Say 'Y' here if you want your kernel to support the
           Atheros PB44 reference board.
@@ -28,4 +29,7 @@ config ATH79_DEV_GPIO_BUTTONS
 config ATH79_DEV_LEDS_GPIO
         def_bool n
 
+config ATH79_DEV_SPI
+        def_bool n
+
 endif
diff --git a/arch/mips/ath79/Makefile b/arch/mips/ath79/Makefile
index 344e9ab1e106..42f4295e650a 100644
--- a/arch/mips/ath79/Makefile
+++ b/arch/mips/ath79/Makefile
@@ -18,6 +18,7 @@ obj-$(CONFIG_EARLY_PRINTK)		+= early_printk.o
 obj-y                                   += dev-common.o
 obj-$(CONFIG_ATH79_DEV_GPIO_BUTTONS)    += dev-gpio-buttons.o
 obj-$(CONFIG_ATH79_DEV_LEDS_GPIO)       += dev-leds-gpio.o
+obj-$(CONFIG_ATH79_DEV_SPI)             += dev-spi.o
 
 #
 # Machines
diff --git a/arch/mips/ath79/dev-spi.c b/arch/mips/ath79/dev-spi.c
new file mode 100644
index 000000000000..aa30163efbfd
--- /dev/null
+++ b/arch/mips/ath79/dev-spi.c
@@ -0,0 +1,38 @@
+/*
+ *  Atheros AR71XX/AR724X/AR913X SPI controller device
+ *
+ *  Copyright (C) 2008-2010 Gabor Juhos <juhosg@openwrt.org>
+ *  Copyright (C) 2008 Imre Kaloz <kaloz@openwrt.org>
+ *
+ *  This program is free software; you can redistribute it and/or modify it
+ *  under the terms of the GNU General Public License version 2 as published
+ *  by the Free Software Foundation.
+ */
+
+#include <linux/platform_device.h>
+#include <asm/mach-ath79/ar71xx_regs.h>
+#include "dev-spi.h"
+
+static struct resource ath79_spi_resources[] = {
+        {
+                .start  = AR71XX_SPI_BASE,
+                .end    = AR71XX_SPI_BASE + AR71XX_SPI_SIZE - 1,
+                .flags  = IORESOURCE_MEM,
+        },
+};
+
+static struct platform_device ath79_spi_device = {
+        .name           = "ath79-spi",
+        .id             = -1,
+        .resource       = ath79_spi_resources,
+        .num_resources  = ARRAY_SIZE(ath79_spi_resources),
+};
+
+void __init ath79_register_spi(struct ath79_spi_platform_data *pdata,
+                               struct spi_board_info const *info,
+                               unsigned n)
+{
+        spi_register_board_info(info, n);
+        ath79_spi_device.dev.platform_data = pdata;
+        platform_device_register(&ath79_spi_device);
+}
diff --git a/arch/mips/ath79/dev-spi.h b/arch/mips/ath79/dev-spi.h
new file mode 100644
index 000000000000..d732565ca736
--- /dev/null
+++ b/arch/mips/ath79/dev-spi.h
@@ -0,0 +1,22 @@
+/*
+ *  Atheros AR71XX/AR724X/AR913X SPI controller device
+ *
+ *  Copyright (C) 2008-2010 Gabor Juhos <juhosg@openwrt.org>
+ *  Copyright (C) 2008 Imre Kaloz <kaloz@openwrt.org>
+ *
+ *  This program is free software; you can redistribute it and/or modify it
+ *  under the terms of the GNU General Public License version 2 as published
+ *  by the Free Software Foundation.
+ */
+
+#ifndef _ATH79_DEV_SPI_H
+#define _ATH79_DEV_SPI_H
+
+#include <linux/spi/spi.h>
+#include <asm/mach-ath79/ath79_spi_platform.h>
+
+void ath79_register_spi(struct ath79_spi_platform_data *pdata,
+                         struct spi_board_info const *info,
+                         unsigned n);
+
+#endif /* _ATH79_DEV_SPI_H */
diff --git a/arch/mips/ath79/mach-pb44.c b/arch/mips/ath79/mach-pb44.c
index 3dc5080185cb..ec7b7a135d53 100644
--- a/arch/mips/ath79/mach-pb44.c
+++ b/arch/mips/ath79/mach-pb44.c
@@ -17,6 +17,7 @@
 #include "machtypes.h"
 #include "dev-gpio-buttons.h"
 #include "dev-leds-gpio.h"
+#include "dev-spi.h"
 
 #define PB44_GPIO_I2C_SCL       0
 #define PB44_GPIO_I2C_SDA       1
@@ -84,6 +85,20 @@ static struct gpio_keys_button pb44_gpio_keys[] __initdata = {
         }
 };
 
+static struct spi_board_info pb44_spi_info[] = {
+        {
+                .bus_num        = 0,
+                .chip_select    = 0,
+                .max_speed_hz   = 25000000,
+                .modalias       = "m25p64",
+        },
+};
+
+static struct ath79_spi_platform_data pb44_spi_data = {
+        .bus_num                = 0,
+        .num_chipselect         = 1,
+};
+
 static void __init pb44_init(void)
 {
         i2c_register_board_info(0, pb44_i2c_board_info,
@@ -95,6 +110,8 @@ static void __init pb44_init(void)
         ath79_register_gpio_keys_polled(-1, PB44_KEYS_POLL_INTERVAL,
                                         ARRAY_SIZE(pb44_gpio_keys),
                                         pb44_gpio_keys);
+        ath79_register_spi(&pb44_spi_data, pb44_spi_info,
+                           ARRAY_SIZE(pb44_spi_info));
 }
 
 MIPS_MACHINE(ATH79_MACH_PB44, "PB44", "Atheros PB44 reference board",
diff --git a/arch/mips/include/asm/mach-ath79/ar71xx_regs.h b/arch/mips/include/asm/mach-ath79/ar71xx_regs.h
index 7f2933d8b935..4f2b621638d9 100644
--- a/arch/mips/include/asm/mach-ath79/ar71xx_regs.h
+++ b/arch/mips/include/asm/mach-ath79/ar71xx_regs.h
@@ -20,6 +20,8 @@
 #include <linux/bitops.h>
 
 #define AR71XX_APB_BASE         0x18000000
+#define AR71XX_SPI_BASE         0x1f000000
+#define AR71XX_SPI_SIZE         0x01000000
 
 #define AR71XX_DDR_CTRL_BASE    (AR71XX_APB_BASE + 0x00000000)
 #define AR71XX_DDR_CTRL_SIZE    0x100