arch/arm/mach-s5p6440/dev-spi.c

   1 /* linux/arch/arm/mach-s5p6440/dev-spi.c
   2  *
   3  * Copyright (C) 2010 Samsung Electronics Co. Ltd.
   4  *      Jaswinder Singh <jassi.brar@samsung.com>
   5  *
   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.
   9  */
  10
  11 #include <linux/platform_device.h>
  12 #include <linux/dma-mapping.h>
  13
  14 #include <mach/dma.h>
  15 #include <mach/map.h>
  16 #include <mach/irqs.h>
  17 #include <mach/gpio.h>
  18 #include <mach/spi-clocks.h>
  19
  20 #include <plat/s3c64xx-spi.h>
  21 #include <plat/gpio-cfg.h>
  22
  23 static char *spi_src_clks[] = {
  24         [S5P6440_SPI_SRCCLK_PCLK] = "pclk",
  25         [S5P6440_SPI_SRCCLK_SCLK] = "spi_epll",
  26 };
  27
  28 /* SPI Controller platform_devices */
  29
  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.
  35  */
  36 static int s5p6440_spi_cfg_gpio(struct platform_device *pdev)
  37 {
  38         switch (pdev->id) {
  39         case 0:
  40                 s3c_gpio_cfgpin(S5P6440_GPC(0), S3C_GPIO_SFN(2));
  41                 s3c_gpio_cfgpin(S5P6440_GPC(1), S3C_GPIO_SFN(2));
  42                 s3c_gpio_cfgpin(S5P6440_GPC(2), S3C_GPIO_SFN(2));
  43                 s3c_gpio_setpull(S5P6440_GPC(0), S3C_GPIO_PULL_UP);
  44                 s3c_gpio_setpull(S5P6440_GPC(1), S3C_GPIO_PULL_UP);
  45                 s3c_gpio_setpull(S5P6440_GPC(2), S3C_GPIO_PULL_UP);
  46                 break;
  47
  48         case 1:
  49                 s3c_gpio_cfgpin(S5P6440_GPC(4), S3C_GPIO_SFN(2));
  50                 s3c_gpio_cfgpin(S5P6440_GPC(5), S3C_GPIO_SFN(2));
  51                 s3c_gpio_cfgpin(S5P6440_GPC(6), S3C_GPIO_SFN(2));
  52                 s3c_gpio_setpull(S5P6440_GPC(4), S3C_GPIO_PULL_UP);
  53                 s3c_gpio_setpull(S5P6440_GPC(5), S3C_GPIO_PULL_UP);
  54                 s3c_gpio_setpull(S5P6440_GPC(6), S3C_GPIO_PULL_UP);
  55                 break;
  56
  57         default:
  58                 dev_err(&pdev->dev, "Invalid SPI Controller number!");
  59                 return -EINVAL;
  60         }
  61
  62         return 0;
  63 }
  64
  65 static struct resource s5p6440_spi0_resource[] = {
  66         [0] = {
  67                 .start = S5P6440_PA_SPI0,
  68                 .end   = S5P6440_PA_SPI0 + 0x100 - 1,
  69                 .flags = IORESOURCE_MEM,
  70         },
  71         [1] = {
  72                 .start = DMACH_SPI0_TX,
  73                 .end   = DMACH_SPI0_TX,
  74                 .flags = IORESOURCE_DMA,
  75         },
  76         [2] = {
  77                 .start = DMACH_SPI0_RX,
  78                 .end   = DMACH_SPI0_RX,
  79                 .flags = IORESOURCE_DMA,
  80         },
  81         [3] = {
  82                 .start = IRQ_SPI0,
  83                 .end   = IRQ_SPI0,
  84                 .flags = IORESOURCE_IRQ,
  85         },
  86 };
  87
  88 static struct s3c64xx_spi_info s5p6440_spi0_pdata = {
  89         .cfg_gpio = s5p6440_spi_cfg_gpio,
  90         .fifo_lvl_mask = 0x1ff,
  91         .rx_lvl_offset = 15,
  92 };
  93
  94 static u64 spi_dmamask = DMA_BIT_MASK(32);
  95
  96 struct platform_device s5p6440_device_spi0 = {
  97         .name             = "s3c64xx-spi",
  98         .id               = 0,
  99         .num_resources    = ARRAY_SIZE(s5p6440_spi0_resource),
 100         .resource         = s5p6440_spi0_resource,
 101         .dev = {
 102                 .dma_mask               = &spi_dmamask,
 103                 .coherent_dma_mask      = DMA_BIT_MASK(32),
 104                 .platform_data = &s5p6440_spi0_pdata,
 105         },
 106 };
 107
 108 static struct resource s5p6440_spi1_resource[] = {
 109         [0] = {
 110                 .start = S5P6440_PA_SPI1,
 111                 .end   = S5P6440_PA_SPI1 + 0x100 - 1,
 112                 .flags = IORESOURCE_MEM,
 113         },
 114         [1] = {
 115                 .start = DMACH_SPI1_TX,
 116                 .end   = DMACH_SPI1_TX,
 117                 .flags = IORESOURCE_DMA,
 118         },
 119         [2] = {
 120                 .start = DMACH_SPI1_RX,
 121                 .end   = DMACH_SPI1_RX,
 122                 .flags = IORESOURCE_DMA,
 123         },
 124         [3] = {
 125                 .start = IRQ_SPI1,
 126                 .end   = IRQ_SPI1,
 127                 .flags = IORESOURCE_IRQ,
 128         },
 129 };
 130
 131 static struct s3c64xx_spi_info s5p6440_spi1_pdata = {
 132         .cfg_gpio = s5p6440_spi_cfg_gpio,
 133         .fifo_lvl_mask = 0x7f,
 134         .rx_lvl_offset = 15,
 135 };
 136
 137 struct platform_device s5p6440_device_spi1 = {
 138         .name             = "s3c64xx-spi",
 139         .id               = 1,
 140         .num_resources    = ARRAY_SIZE(s5p6440_spi1_resource),
 141         .resource         = s5p6440_spi1_resource,
 142         .dev = {
 143                 .dma_mask               = &spi_dmamask,
 144                 .coherent_dma_mask      = DMA_BIT_MASK(32),
 145                 .platform_data = &s5p6440_spi1_pdata,
 146         },
 147 };
 148
 149 void __init s5p6440_spi_set_info(int cntrlr, int src_clk_nr, int num_cs)
 150 {
 151         struct s3c64xx_spi_info *pd;
 152
 153         /* Reject invalid configuration */
 154         if (!num_cs || src_clk_nr < 0
 155                         || src_clk_nr > S5P6440_SPI_SRCCLK_SCLK) {
 156                 printk(KERN_ERR "%s: Invalid SPI configuration\n", __func__);
 157                 return;
 158         }
 159
 160         switch (cntrlr) {
 161         case 0:
 162                 pd = &s5p6440_spi0_pdata;
 163                 break;
 164         case 1:
 165                 pd = &s5p6440_spi1_pdata;
 166                 break;
 167         default:
 168                 printk(KERN_ERR "%s: Invalid SPI controller(%d)\n",
 169                                                         __func__, cntrlr);
 170                 return;
 171         }
 172
 173         pd->num_cs = num_cs;
 174         pd->src_clk_nr = src_clk_nr;
 175         pd->src_clk_name = spi_src_clks[src_clk_nr];
 176 }