1 /* linux/arch/arm/plat-s3c64xx/dev-spi.c
3 * Copyright (C) 2009 Samsung Electronics Ltd.
4 * Jaswinder Singh <jassi.brar@samsung.com>
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
11 #include <linux/kernel.h>
12 #include <linux/string.h>
13 #include <linux/platform_device.h>
14 #include <linux/dma-mapping.h>
15 #include <linux/gpio.h>
19 #include <mach/spi-clocks.h>
20 #include <mach/irqs.h>
22 #include <plat/s3c64xx-spi.h>
23 #include <plat/gpio-cfg.h>
24 #include <plat/devs.h>
26 static char *spi_src_clks[] = {
27 [S3C64XX_SPI_SRCCLK_PCLK] = "pclk",
28 [S3C64XX_SPI_SRCCLK_SPIBUS] = "spi-bus",
29 [S3C64XX_SPI_SRCCLK_48M] = "spi_48m",
32 /* SPI Controller platform_devices */
34 /* Since we emulate multi-cs capability, we do not touch the GPC-3,7.
35 * The emulated CS is toggled by board specific mechanism, as it can
36 * be either some immediate GPIO or some signal out of some other
37 * chip in between ... or some yet another way.
38 * We simply do not assume anything about CS.
40 static int s3c64xx_spi_cfg_gpio(struct platform_device *pdev)
46 base = S3C64XX_GPC(0);
50 base = S3C64XX_GPC(4);
54 dev_err(&pdev->dev, "Invalid SPI Controller number!");
58 s3c_gpio_cfgall_range(base, 3,
59 S3C_GPIO_SFN(2), S3C_GPIO_PULL_UP);
64 static struct resource s3c64xx_spi0_resource[] = {
66 .start = S3C64XX_PA_SPI0,
67 .end = S3C64XX_PA_SPI0 + 0x100 - 1,
68 .flags = IORESOURCE_MEM,
71 .start = DMACH_SPI0_TX,
73 .flags = IORESOURCE_DMA,
76 .start = DMACH_SPI0_RX,
78 .flags = IORESOURCE_DMA,
83 .flags = IORESOURCE_IRQ,
87 static struct s3c64xx_spi_info s3c64xx_spi0_pdata = {
88 .cfg_gpio = s3c64xx_spi_cfg_gpio,
89 .fifo_lvl_mask = 0x7f,
94 static u64 spi_dmamask = DMA_BIT_MASK(32);
96 struct platform_device s3c64xx_device_spi0 = {
97 .name = "s3c64xx-spi",
99 .num_resources = ARRAY_SIZE(s3c64xx_spi0_resource),
100 .resource = s3c64xx_spi0_resource,
102 .dma_mask = &spi_dmamask,
103 .coherent_dma_mask = DMA_BIT_MASK(32),
104 .platform_data = &s3c64xx_spi0_pdata,
107 EXPORT_SYMBOL(s3c64xx_device_spi0);
109 static struct resource s3c64xx_spi1_resource[] = {
111 .start = S3C64XX_PA_SPI1,
112 .end = S3C64XX_PA_SPI1 + 0x100 - 1,
113 .flags = IORESOURCE_MEM,
116 .start = DMACH_SPI1_TX,
117 .end = DMACH_SPI1_TX,
118 .flags = IORESOURCE_DMA,
121 .start = DMACH_SPI1_RX,
122 .end = DMACH_SPI1_RX,
123 .flags = IORESOURCE_DMA,
128 .flags = IORESOURCE_IRQ,
132 static struct s3c64xx_spi_info s3c64xx_spi1_pdata = {
133 .cfg_gpio = s3c64xx_spi_cfg_gpio,
134 .fifo_lvl_mask = 0x7f,
139 struct platform_device s3c64xx_device_spi1 = {
140 .name = "s3c64xx-spi",
142 .num_resources = ARRAY_SIZE(s3c64xx_spi1_resource),
143 .resource = s3c64xx_spi1_resource,
145 .dma_mask = &spi_dmamask,
146 .coherent_dma_mask = DMA_BIT_MASK(32),
147 .platform_data = &s3c64xx_spi1_pdata,
150 EXPORT_SYMBOL(s3c64xx_device_spi1);
152 void __init s3c64xx_spi_set_info(int cntrlr, int src_clk_nr, int num_cs)
154 struct s3c64xx_spi_info *pd;
156 /* Reject invalid configuration */
157 if (!num_cs || src_clk_nr < 0
158 || src_clk_nr > S3C64XX_SPI_SRCCLK_48M) {
159 printk(KERN_ERR "%s: Invalid SPI configuration\n", __func__);
165 pd = &s3c64xx_spi0_pdata;
168 pd = &s3c64xx_spi1_pdata;
171 printk(KERN_ERR "%s: Invalid SPI controller(%d)\n",
177 pd->src_clk_nr = src_clk_nr;
178 pd->src_clk_name = spi_src_clks[src_clk_nr];