ARM: S3C64XX: SPI: Define SPI controller devices

Platform devices for SPI Controller of S3C64XX are defined and exported for
machines to include. Also, controller setup helper functions are defined for
machine code to set runtime configuration of the controller and the bus.

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

3 files changed, 184 insertions, 0 deletions

diff --git a/arch/arm/plat-s3c/include/plat/devs.h b/arch/arm/plat-s3c/include/plat/devs.h
index 8a4153b49f40..f4a7e57bab2b 100644
--- a/arch/arm/plat-s3c/include/plat/devs.h
+++ b/arch/arm/plat-s3c/include/plat/devs.h
@@ -29,6 +29,9 @@ extern struct platform_device s3c64xx_device_iis0;
 extern struct platform_device s3c64xx_device_iis1;
 extern struct platform_device s3c64xx_device_iisv4;
 
+extern struct platform_device s3c64xx_device_spi0;
+extern struct platform_device s3c64xx_device_spi1;
+
 extern struct platform_device s3c64xx_device_pcm0;
 extern struct platform_device s3c64xx_device_pcm1;
 
diff --git a/arch/arm/plat-s3c64xx/Makefile b/arch/arm/plat-s3c64xx/Makefile
index b241f3695560..80255a5e1789 100644
--- a/arch/arm/plat-s3c64xx/Makefile
+++ b/arch/arm/plat-s3c64xx/Makefile
@@ -47,3 +47,4 @@ obj-$(CONFIG_S3C64XX_SETUP_I2C1) += setup-i2c1.o
 obj-$(CONFIG_S3C64XX_SETUP_FB_24BPP) += setup-fb-24bpp.o
 obj-$(CONFIG_S3C64XX_SETUP_SDHCI_GPIO) += setup-sdhci-gpio.o
 obj-$(CONFIG_SND_S3C24XX_SOC) += dev-audio.o
+obj-$(CONFIG_SPI_S3C64XX) += dev-spi.o
diff --git a/arch/arm/plat-s3c64xx/dev-spi.c b/arch/arm/plat-s3c64xx/dev-spi.c
new file mode 100644
index 000000000000..6b6d7af06624
--- /dev/null
+++ b/arch/arm/plat-s3c64xx/dev-spi.c
@@ -0,0 +1,180 @@
+/* linux/arch/arm/plat-s3c64xx/dev-spi.c
+ *
+ * Copyright (C) 2009 Samsung Electronics 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/kernel.h>
+#include <linux/string.h>
+#include <linux/platform_device.h>
+#include <linux/dma-mapping.h>
+
+#include <mach/dma.h>
+#include <mach/map.h>
+#include <mach/gpio.h>
+
+#include <plat/spi-clocks.h>
+#include <plat/s3c64xx-spi.h>
+#include <plat/gpio-bank-c.h>
+#include <plat/gpio-cfg.h>
+#include <plat/irqs.h>
+
+static char *spi_src_clks[] = {
+        [S3C64XX_SPI_SRCCLK_PCLK] = "pclk",
+        [S3C64XX_SPI_SRCCLK_SPIBUS] = "spi-bus",
+        [S3C64XX_SPI_SRCCLK_48M] = "spi_48m",
+};
+
+/* SPI Controller platform_devices */
+
+/* Since we emulate multi-cs capability, we do not touch the GPC-3,7.
+ * 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 s3c64xx_spi_cfg_gpio(struct platform_device *pdev)
+{
+        switch (pdev->id) {
+        case 0:
+                s3c_gpio_cfgpin(S3C64XX_GPC(0), S3C64XX_GPC0_SPI_MISO0);
+                s3c_gpio_cfgpin(S3C64XX_GPC(1), S3C64XX_GPC1_SPI_CLKO);
+                s3c_gpio_cfgpin(S3C64XX_GPC(2), S3C64XX_GPC2_SPI_MOSIO);
+                s3c_gpio_setpull(S3C64XX_GPC(0), S3C_GPIO_PULL_UP);
+                s3c_gpio_setpull(S3C64XX_GPC(1), S3C_GPIO_PULL_UP);
+                s3c_gpio_setpull(S3C64XX_GPC(2), S3C_GPIO_PULL_UP);
+                break;
+
+        case 1:
+                s3c_gpio_cfgpin(S3C64XX_GPC(4), S3C64XX_GPC4_SPI_MISO1);
+                s3c_gpio_cfgpin(S3C64XX_GPC(5), S3C64XX_GPC5_SPI_CLK1);
+                s3c_gpio_cfgpin(S3C64XX_GPC(6), S3C64XX_GPC6_SPI_MOSI1);
+                s3c_gpio_setpull(S3C64XX_GPC(4), S3C_GPIO_PULL_UP);
+                s3c_gpio_setpull(S3C64XX_GPC(5), S3C_GPIO_PULL_UP);
+                s3c_gpio_setpull(S3C64XX_GPC(6), S3C_GPIO_PULL_UP);
+                break;
+
+        default:
+                dev_err(&pdev->dev, "Invalid SPI Controller number!");
+                return -EINVAL;
+        }
+
+        return 0;
+}
+
+static struct resource s3c64xx_spi0_resource[] = {
+        [0] = {
+                .start = S3C64XX_PA_SPI0,
+                .end   = S3C64XX_PA_SPI0 + 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 s3c64xx_spi0_pdata = {
+        .cfg_gpio = s3c64xx_spi_cfg_gpio,
+        .fifo_lvl_mask = 0x7f,
+        .rx_lvl_offset = 13,
+};
+
+static u64 spi_dmamask = DMA_BIT_MASK(32);
+
+struct platform_device s3c64xx_device_spi0 = {
+        .name             = "s3c64xx-spi",
+        .id               = 0,
+        .num_resources    = ARRAY_SIZE(s3c64xx_spi0_resource),
+        .resource         = s3c64xx_spi0_resource,
+        .dev = {
+                .dma_mask               = &spi_dmamask,
+                .coherent_dma_mask      = DMA_BIT_MASK(32),
+                .platform_data = &s3c64xx_spi0_pdata,
+        },
+};
+EXPORT_SYMBOL(s3c64xx_device_spi0);
+
+static struct resource s3c64xx_spi1_resource[] = {
+        [0] = {
+                .start = S3C64XX_PA_SPI1,
+                .end   = S3C64XX_PA_SPI1 + 0x100 - 1,
+                .flags = IORESOURCE_MEM,
+        },
+        [1] = {
+                .start = DMACH_SPI1_TX,
+                .end   = DMACH_SPI1_TX,
+                .flags = IORESOURCE_DMA,
+        },
+        [2] = {
+                .start = DMACH_SPI1_RX,
+                .end   = DMACH_SPI1_RX,
+                .flags = IORESOURCE_DMA,
+        },
+        [3] = {
+                .start = IRQ_SPI1,
+                .end   = IRQ_SPI1,
+                .flags = IORESOURCE_IRQ,
+        },
+};
+
+static struct s3c64xx_spi_info s3c64xx_spi1_pdata = {
+        .cfg_gpio = s3c64xx_spi_cfg_gpio,
+        .fifo_lvl_mask = 0x7f,
+        .rx_lvl_offset = 13,
+};
+
+struct platform_device s3c64xx_device_spi1 = {
+        .name             = "s3c64xx-spi",
+        .id               = 1,
+        .num_resources    = ARRAY_SIZE(s3c64xx_spi1_resource),
+        .resource         = s3c64xx_spi1_resource,
+        .dev = {
+                .dma_mask               = &spi_dmamask,
+                .coherent_dma_mask      = DMA_BIT_MASK(32),
+                .platform_data = &s3c64xx_spi1_pdata,
+        },
+};
+EXPORT_SYMBOL(s3c64xx_device_spi1);
+
+void __init s3c64xx_spi_set_info(int cntrlr, int src_clk_nr, int num_cs)
+{
+        /* Reject invalid configuration */
+        if (!num_cs || src_clk_nr < 0
+                        || src_clk_nr > S3C64XX_SPI_SRCCLK_48M) {
+                printk(KERN_ERR "%s: Invalid SPI configuration\n", __func__);
+                return;
+        }
+
+        switch (cntrlr) {
+        case 0:
+                s3c64xx_spi0_pdata.num_cs = num_cs;
+                s3c64xx_spi0_pdata.src_clk_nr = src_clk_nr;
+                s3c64xx_spi0_pdata.src_clk_name = spi_src_clks[src_clk_nr];
+                break;
+        case 1:
+                s3c64xx_spi1_pdata.num_cs = num_cs;
+                s3c64xx_spi1_pdata.src_clk_nr = src_clk_nr;
+                s3c64xx_spi1_pdata.src_clk_name = spi_src_clks[src_clk_nr];
+                break;
+        default:
+                printk(KERN_ERR "%s: Invalid SPI controller(%d)\n",
+                                                        __func__, cntrlr);
+                return;
+        }
+}