ARM: S5P6442: Define SPI platform devices

Define SPI platform devices for the SoC.

Signed-off-by: Jassi Brar <jassi.brar@samsung.com>
Signed-off-by: Ben Dooks <ben-linux@fluff.org>

4 files changed, 143 insertions, 0 deletions

diff --git a/arch/arm/mach-s5p6442/Makefile b/arch/arm/mach-s5p6442/Makefile
index e30a7f76aee6..90a3d8373416 100644
--- a/arch/arm/mach-s5p6442/Makefile
+++ b/arch/arm/mach-s5p6442/Makefile
@@ -21,3 +21,4 @@ obj-$(CONFIG_MACH_SMDK6442)	+= mach-smdk6442.o
 
 # device support
 obj-y                           += dev-audio.o
+obj-$(CONFIG_S3C64XX_DEV_SPI)   += dev-spi.o
diff --git a/arch/arm/mach-s5p6442/dev-spi.c b/arch/arm/mach-s5p6442/dev-spi.c
new file mode 100644
index 000000000000..30199525daca
--- /dev/null
+++ b/arch/arm/mach-s5p6442/dev-spi.c
@@ -0,0 +1,123 @@
+/* linux/arch/arm/mach-s5p6442/dev-spi.c
+ *
+ * Copyright (C) 2010 Samsung Electronics Co. Ltd.
+ *      Jaswinder Singh <jassi.brar@samsung.com>
+ *
+ * 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 <linux/dma-mapping.h>
+
+#include <mach/dma.h>
+#include <mach/map.h>
+#include <mach/irqs.h>
+#include <mach/gpio.h>
+#include <mach/spi-clocks.h>
+
+#include <plat/s3c64xx-spi.h>
+#include <plat/gpio-cfg.h>
+
+static char *spi_src_clks[] = {
+        [S5P6442_SPI_SRCCLK_PCLK] = "pclk",
+        [S5P6442_SPI_SRCCLK_SCLK] = "spi_epll",
+};
+
+/* SPI Controller platform_devices */
+
+/* Since we emulate multi-cs capability, we do not touch the CS.
+ * The emulated CS is toggled by board specific mechanism, as it can
+ * be either some immediate GPIO or some signal out of some other
+ * chip in between ... or some yet another way.
+ * We simply do not assume anything about CS.
+ */
+static int s5p6442_spi_cfg_gpio(struct platform_device *pdev)
+{
+        switch (pdev->id) {
+        case 0:
+                s3c_gpio_cfgpin(S5P6442_GPB(0), S3C_GPIO_SFN(2));
+                s3c_gpio_cfgpin(S5P6442_GPB(2), S3C_GPIO_SFN(2));
+                s3c_gpio_cfgpin(S5P6442_GPB(3), S3C_GPIO_SFN(2));
+                s3c_gpio_setpull(S5P6442_GPB(0), S3C_GPIO_PULL_UP);
+                s3c_gpio_setpull(S5P6442_GPB(2), S3C_GPIO_PULL_UP);
+                s3c_gpio_setpull(S5P6442_GPB(3), S3C_GPIO_PULL_UP);
+                break;
+
+        default:
+                dev_err(&pdev->dev, "Invalid SPI Controller number!");
+                return -EINVAL;
+        }
+
+        return 0;
+}
+
+static struct resource s5p6442_spi0_resource[] = {
+        [0] = {
+                .start = S5P6442_PA_SPI,
+                .end   = S5P6442_PA_SPI + 0x100 - 1,
+                .flags = IORESOURCE_MEM,
+        },
+        [1] = {
+                .start = DMACH_SPI0_TX,
+                .end   = DMACH_SPI0_TX,
+                .flags = IORESOURCE_DMA,
+        },
+        [2] = {
+                .start = DMACH_SPI0_RX,
+                .end   = DMACH_SPI0_RX,
+                .flags = IORESOURCE_DMA,
+        },
+        [3] = {
+                .start = IRQ_SPI0,
+                .end   = IRQ_SPI0,
+                .flags = IORESOURCE_IRQ,
+        },
+};
+
+static struct s3c64xx_spi_info s5p6442_spi0_pdata = {
+        .cfg_gpio = s5p6442_spi_cfg_gpio,
+        .fifo_lvl_mask = 0x1ff,
+        .rx_lvl_offset = 15,
+};
+
+static u64 spi_dmamask = DMA_BIT_MASK(32);
+
+struct platform_device s5p6442_device_spi = {
+        .name             = "s3c64xx-spi",
+        .id               = 0,
+        .num_resources    = ARRAY_SIZE(s5p6442_spi0_resource),
+        .resource         = s5p6442_spi0_resource,
+        .dev = {
+                .dma_mask               = &spi_dmamask,
+                .coherent_dma_mask      = DMA_BIT_MASK(32),
+                .platform_data = &s5p6442_spi0_pdata,
+        },
+};
+
+void __init s5p6442_spi_set_info(int cntrlr, int src_clk_nr, int num_cs)
+{
+        struct s3c64xx_spi_info *pd;
+
+        /* Reject invalid configuration */
+        if (!num_cs || src_clk_nr < 0
+                        || src_clk_nr > S5P6442_SPI_SRCCLK_SCLK) {
+                printk(KERN_ERR "%s: Invalid SPI configuration\n", __func__);
+                return;
+        }
+
+        switch (cntrlr) {
+        case 0:
+                pd = &s5p6442_spi0_pdata;
+                break;
+        default:
+                printk(KERN_ERR "%s: Invalid SPI controller(%d)\n",
+                                                        __func__, cntrlr);
+                return;
+        }
+
+        pd->num_cs = num_cs;
+        pd->src_clk_nr = src_clk_nr;
+        pd->src_clk_name = spi_src_clks[src_clk_nr];
+}
diff --git a/arch/arm/mach-s5p6442/include/mach/map.h b/arch/arm/mach-s5p6442/include/mach/map.h
index 7568dc0d6be0..32ca424ef7f9 100644
--- a/arch/arm/mach-s5p6442/include/mach/map.h
+++ b/arch/arm/mach-s5p6442/include/mach/map.h
@@ -54,6 +54,8 @@
 #define S5P6442_PA_SDRAM        (0x20000000)
 #define S5P_PA_SDRAM            S5P6442_PA_SDRAM
 
+#define S5P6442_PA_SPI          0xEC300000
+
 /* I2S */
 #define S5P6442_PA_I2S0         0xC0B00000
 #define S5P6442_PA_I2S1         0xF2200000
diff --git a/arch/arm/mach-s5p6442/include/mach/spi-clocks.h b/arch/arm/mach-s5p6442/include/mach/spi-clocks.h
new file mode 100644
index 000000000000..7fd88205a97c
--- /dev/null
+++ b/arch/arm/mach-s5p6442/include/mach/spi-clocks.h
@@ -0,0 +1,17 @@
+/* linux/arch/arm/mach-s5p6442/include/mach/spi-clocks.h
+ *
+ * Copyright (C) 2010 Samsung Electronics Co. Ltd.
+ *      Jaswinder Singh <jassi.brar@samsung.com>
+ *
+ * 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 __S5P6442_PLAT_SPI_CLKS_H
+#define __S5P6442_PLAT_SPI_CLKS_H __FILE__
+
+#define S5P6442_SPI_SRCCLK_PCLK         0
+#define S5P6442_SPI_SRCCLK_SCLK         1
+
+#endif /* __S5P6442_PLAT_SPI_CLKS_H */