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Diffstat (limited to 'arch/arm/mach-s3c64xx/dev-spi.c')
-rw-r--r--arch/arm/mach-s3c64xx/dev-spi.c182
1 files changed, 182 insertions, 0 deletions
diff --git a/arch/arm/mach-s3c64xx/dev-spi.c b/arch/arm/mach-s3c64xx/dev-spi.c
new file mode 100644
index 00000000000..29c32d08851
--- /dev/null
+++ b/arch/arm/mach-s3c64xx/dev-spi.c
@@ -0,0 +1,182 @@
+/* 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 <mach/gpio-bank-c.h>
+#include <mach/spi-clocks.h>
+
+#include <plat/s3c64xx-spi.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)
+{
+ struct s3c64xx_spi_info *pd;
+
+ /* 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:
+ pd = &s3c64xx_spi0_pdata;
+ break;
+ case 1:
+ pd = &s3c64xx_spi1_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];
+}