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[RFC 12/18] MIPS: ath79: add common SPI controller device

To: Ralf Baechle <ralf@linux-mips.org>
Subject: [RFC 12/18] MIPS: ath79: add common SPI controller device
From: Gabor Juhos <juhosg@openwrt.org>
Date: Fri, 12 Nov 2010 22:51:18 +0100
Cc: linux-mips@linux-mips.org, "Luis R. Rodriguez" <mcgrof@gmail.com>, Cliff Holden <Cliff.Holden@Atheros.com>, Imre Kaloz <kaloz@openwrt.org>, Gabor Juhos <juhosg@openwrt.org>
In-reply-to: <1289598684-30624-1-git-send-email-juhosg@openwrt.org>
Original-recipient: rfc822;linux-mips@linux-mips.org
References: <1289598684-30624-1-git-send-email-juhosg@openwrt.org>
Sender: linux-mips-bounce@linux-mips.org
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>
---
 arch/mips/ath79/Kconfig                        |    4 ++
 arch/mips/ath79/Makefile                       |    1 +
 arch/mips/ath79/dev-spi.c                      |   38 ++++++++++++++++++++++++
 arch/mips/ath79/dev-spi.h                      |   22 ++++++++++++++
 arch/mips/ath79/mach-pb44.c                    |   17 ++++++++++
 arch/mips/include/asm/mach-ath79/ar71xx_regs.h |    2 +
 6 files changed, 84 insertions(+), 0 deletions(-)
 create mode 100644 arch/mips/ath79/dev-spi.c
 create mode 100644 arch/mips/ath79/dev-spi.h

diff --git a/arch/mips/ath79/Kconfig b/arch/mips/ath79/Kconfig
index 0c34db1..78f9999 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
        default n
        help
          Say 'Y' here if you want your kernel to support the
@@ -29,6 +30,9 @@ config ATH79_DEV_GPIO_BUTTONS
 config ATH79_DEV_LEDS_GPIO
        def_bool n
 
+config ATH79_DEV_SPI
+       def_bool n
+
 config ATH79_DEV_UART
        def_bool y
 
diff --git a/arch/mips/ath79/Makefile b/arch/mips/ath79/Makefile
index c604f46..875df71 100644
--- a/arch/mips/ath79/Makefile
+++ b/arch/mips/ath79/Makefile
@@ -14,6 +14,7 @@ obj-$(CONFIG_EARLY_PRINTK)            += early_printk.o
 
 obj-$(CONFIG_ATH79_DEV_GPIO_BUTTONS)   += dev-gpio-buttons.o
 obj-$(CONFIG_ATH79_DEV_LEDS_GPIO)      += dev-leds-gpio.o
+obj-$(CONFIG_ATH79_DEV_SPI)            += dev-spi.o
 obj-$(CONFIG_ATH79_DEV_UART)           += dev-uart.o
 obj-$(CONFIG_ATH79_DEV_WDT)            += dev-wdt.o
 
diff --git a/arch/mips/ath79/dev-spi.c b/arch/mips/ath79/dev-spi.c
new file mode 100644
index 0000000..aa30163
--- /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 0000000..9a98333
--- /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 __init 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 5e7b544..257815e 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
@@ -83,6 +84,20 @@ static struct gpio_button pb44_gpio_buttons[] __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,
@@ -94,6 +109,8 @@ static void __init pb44_init(void)
        ath79_register_gpio_buttons(-1, PB44_BUTTONS_POLL_INTERVAL,
                                    ARRAY_SIZE(pb44_gpio_buttons),
                                    pb44_gpio_buttons);
+       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 7f2933d..4f2b621 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
-- 
1.7.2.1


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