arch/arm/mach-s5pc100/dev-spi.c

   1 /* linux/arch/arm/mach-s5pc100/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 #include <linux/gpio.h>
  14
  15 #include <mach/dma.h>
  16 #include <mach/map.h>
  17 #include <mach/spi-clocks.h>
  18
  19 #include <plat/s3c64xx-spi.h>
  20 #include <plat/gpio-cfg.h>
  21 #include <plat/irqs.h>
  22
  23 static char *spi_src_clks[] = {
  24         [S5PC100_SPI_SRCCLK_PCLK] = "pclk",
  25         [S5PC100_SPI_SRCCLK_48M] = "spi_48m",
  26         [S5PC100_SPI_SRCCLK_SPIBUS] = "spi_bus",
  27 };
  28
  29 /* SPI Controller platform_devices */
  30
  31 /* Since we emulate multi-cs capability, we do not touch the CS.
  32  * The emulated CS is toggled by board specific mechanism, as it can
  33  * be either some immediate GPIO or some signal out of some other
  34  * chip in between ... or some yet another way.
  35  * We simply do not assume anything about CS.
  36  */
  37 static int s5pc100_spi_cfg_gpio(struct platform_device *pdev)
  38 {
  39         switch (pdev->id) {
  40         case 0:
  41                 s3c_gpio_cfgall_range(S5PC100_GPB(0), 3,
  42                                       S3C_GPIO_SFN(2), S3C_GPIO_PULL_UP);
  43                 break;
  44
  45         case 1:
  46                 s3c_gpio_cfgall_range(S5PC100_GPB(4), 3,
  47                                       S3C_GPIO_SFN(2), S3C_GPIO_PULL_UP);
  48                 break;
  49
  50         case 2:
  51                 s3c_gpio_cfgpin(S5PC100_GPG3(0), S3C_GPIO_SFN(3));
  52                 s3c_gpio_setpull(S5PC100_GPG3(0), S3C_GPIO_PULL_UP);
  53                 s3c_gpio_cfgall_range(S5PC100_GPB(2), 2,
  54                                       S3C_GPIO_SFN(3), 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 s5pc100_spi0_resource[] = {
  66         [0] = {
  67                 .start = S5PC100_PA_SPI0,
  68                 .end   = S5PC100_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 s5pc100_spi0_pdata = {
  89         .cfg_gpio = s5pc100_spi_cfg_gpio,
  90         .fifo_lvl_mask = 0x7f,
  91         .rx_lvl_offset = 13,
  92         .high_speed = 1,
  93 };
  94
  95 static u64 spi_dmamask = DMA_BIT_MASK(32);
  96
  97 struct platform_device s5pc100_device_spi0 = {
  98         .name             = "s3c64xx-spi",
  99         .id               = 0,
 100         .num_resources    = ARRAY_SIZE(s5pc100_spi0_resource),
 101         .resource         = s5pc100_spi0_resource,
 102         .dev = {
 103                 .dma_mask               = &spi_dmamask,
 104                 .coherent_dma_mask      = DMA_BIT_MASK(32),
 105                 .platform_data = &s5pc100_spi0_pdata,
 106         },
 107 };
 108
 109 static struct resource s5pc100_spi1_resource[] = {
 110         [0] = {
 111                 .start = S5PC100_PA_SPI1,
 112                 .end   = S5PC100_PA_SPI1 + 0x100 - 1,
 113                 .flags = IORESOURCE_MEM,
 114         },
 115         [1] = {
 116                 .start = DMACH_SPI1_TX,
 117                 .end   = DMACH_SPI1_TX,
 118                 .flags = IORESOURCE_DMA,
 119         },
 120         [2] = {
 121                 .start = DMACH_SPI1_RX,
 122                 .end   = DMACH_SPI1_RX,
 123                 .flags = IORESOURCE_DMA,
 124         },
 125         [3] = {
 126                 .start = IRQ_SPI1,
 127                 .end   = IRQ_SPI1,
 128                 .flags = IORESOURCE_IRQ,
 129         },
 130 };
 131
 132 static struct s3c64xx_spi_info s5pc100_spi1_pdata = {
 133         .cfg_gpio = s5pc100_spi_cfg_gpio,
 134         .fifo_lvl_mask = 0x7f,
 135         .rx_lvl_offset = 13,
 136         .high_speed = 1,
 137 };
 138
 139 struct platform_device s5pc100_device_spi1 = {
 140         .name             = "s3c64xx-spi",
 141         .id               = 1,
 142         .num_resources    = ARRAY_SIZE(s5pc100_spi1_resource),
 143         .resource         = s5pc100_spi1_resource,
 144         .dev = {
 145                 .dma_mask               = &spi_dmamask,
 146                 .coherent_dma_mask      = DMA_BIT_MASK(32),
 147                 .platform_data = &s5pc100_spi1_pdata,
 148         },
 149 };
 150
 151 static struct resource s5pc100_spi2_resource[] = {
 152         [0] = {
 153                 .start = S5PC100_PA_SPI2,
 154                 .end   = S5PC100_PA_SPI2 + 0x100 - 1,
 155                 .flags = IORESOURCE_MEM,
 156         },
 157         [1] = {
 158                 .start = DMACH_SPI2_TX,
 159                 .end   = DMACH_SPI2_TX,
 160                 .flags = IORESOURCE_DMA,
 161         },
 162         [2] = {
 163                 .start = DMACH_SPI2_RX,
 164                 .end   = DMACH_SPI2_RX,
 165                 .flags = IORESOURCE_DMA,
 166         },
 167         [3] = {
 168                 .start = IRQ_SPI2,
 169                 .end   = IRQ_SPI2,
 170                 .flags = IORESOURCE_IRQ,
 171         },
 172 };
 173
 174 static struct s3c64xx_spi_info s5pc100_spi2_pdata = {
 175         .cfg_gpio = s5pc100_spi_cfg_gpio,
 176         .fifo_lvl_mask = 0x7f,
 177         .rx_lvl_offset = 13,
 178         .high_speed = 1,
 179 };
 180
 181 struct platform_device s5pc100_device_spi2 = {
 182         .name             = "s3c64xx-spi",
 183         .id               = 2,
 184         .num_resources    = ARRAY_SIZE(s5pc100_spi2_resource),
 185         .resource         = s5pc100_spi2_resource,
 186         .dev = {
 187                 .dma_mask               = &spi_dmamask,
 188                 .coherent_dma_mask      = DMA_BIT_MASK(32),
 189                 .platform_data = &s5pc100_spi2_pdata,
 190         },
 191 };
 192
 193 void __init s5pc100_spi_set_info(int cntrlr, int src_clk_nr, int num_cs)
 194 {
 195         struct s3c64xx_spi_info *pd;
 196
 197         /* Reject invalid configuration */
 198         if (!num_cs || src_clk_nr < 0
 199                         || src_clk_nr > S5PC100_SPI_SRCCLK_SPIBUS) {
 200                 printk(KERN_ERR "%s: Invalid SPI configuration\n", __func__);
 201                 return;
 202         }
 203
 204         switch (cntrlr) {
 205         case 0:
 206                 pd = &s5pc100_spi0_pdata;
 207                 break;
 208         case 1:
 209                 pd = &s5pc100_spi1_pdata;
 210                 break;
 211         case 2:
 212                 pd = &s5pc100_spi2_pdata;
 213                 break;
 214         default:
 215                 printk(KERN_ERR "%s: Invalid SPI controller(%d)\n",
 216                                                         __func__, cntrlr);
 217                 return;
 218         }
 219
 220         pd->num_cs = num_cs;
 221         pd->src_clk_nr = src_clk_nr;
 222         pd->src_clk_name = spi_src_clks[src_clk_nr];
 223 }