1 /* linux/arch/arm/mach-s5p6442/dev-spi.c
3 * Copyright (C) 2010 Samsung Electronics Co. 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/platform_device.h>
12 #include <linux/dma-mapping.h>
13 #include <linux/gpio.h>
17 #include <mach/irqs.h>
18 #include <mach/spi-clocks.h>
20 #include <plat/s3c64xx-spi.h>
21 #include <plat/gpio-cfg.h>
23 static char *spi_src_clks[] = {
24 [S5P6442_SPI_SRCCLK_PCLK] = "pclk",
25 [S5P6442_SPI_SRCCLK_SCLK] = "spi_epll",
28 /* SPI Controller platform_devices */
30 /* Since we emulate multi-cs capability, we do not touch the CS.
31 * The emulated CS is toggled by board specific mechanism, as it can
32 * be either some immediate GPIO or some signal out of some other
33 * chip in between ... or some yet another way.
34 * We simply do not assume anything about CS.
36 static int s5p6442_spi_cfg_gpio(struct platform_device *pdev)
40 s3c_gpio_cfgpin(S5P6442_GPB(0), S3C_GPIO_SFN(2));
41 s3c_gpio_cfgpin_range(S5P6442_GPB(2), 2, S3C_GPIO_SFN(2));
42 s3c_gpio_setpull(S5P6442_GPB(0), S3C_GPIO_PULL_UP);
43 s3c_gpio_setpull(S5P6442_GPB(2), S3C_GPIO_PULL_UP);
44 s3c_gpio_setpull(S5P6442_GPB(3), S3C_GPIO_PULL_UP);
48 dev_err(&pdev->dev, "Invalid SPI Controller number!");
55 static struct resource s5p6442_spi0_resource[] = {
57 .start = S5P6442_PA_SPI,
58 .end = S5P6442_PA_SPI + 0x100 - 1,
59 .flags = IORESOURCE_MEM,
62 .start = DMACH_SPI0_TX,
64 .flags = IORESOURCE_DMA,
67 .start = DMACH_SPI0_RX,
69 .flags = IORESOURCE_DMA,
74 .flags = IORESOURCE_IRQ,
78 static struct s3c64xx_spi_info s5p6442_spi0_pdata = {
79 .cfg_gpio = s5p6442_spi_cfg_gpio,
80 .fifo_lvl_mask = 0x1ff,
84 static u64 spi_dmamask = DMA_BIT_MASK(32);
86 struct platform_device s5p6442_device_spi = {
87 .name = "s3c64xx-spi",
89 .num_resources = ARRAY_SIZE(s5p6442_spi0_resource),
90 .resource = s5p6442_spi0_resource,
92 .dma_mask = &spi_dmamask,
93 .coherent_dma_mask = DMA_BIT_MASK(32),
94 .platform_data = &s5p6442_spi0_pdata,
98 void __init s5p6442_spi_set_info(int cntrlr, int src_clk_nr, int num_cs)
100 struct s3c64xx_spi_info *pd;
102 /* Reject invalid configuration */
103 if (!num_cs || src_clk_nr < 0
104 || src_clk_nr > S5P6442_SPI_SRCCLK_SCLK) {
105 printk(KERN_ERR "%s: Invalid SPI configuration\n", __func__);
111 pd = &s5p6442_spi0_pdata;
114 printk(KERN_ERR "%s: Invalid SPI controller(%d)\n",
120 pd->src_clk_nr = src_clk_nr;
121 pd->src_clk_name = spi_src_clks[src_clk_nr];