arch/arm/mach-s3c64xx/dev-spi.c

   1 /* linux/arch/arm/plat-s3c64xx/dev-spi.c
   2  *
   3  * Copyright (C) 2009 Samsung Electronics 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/kernel.h>
  12 #include <linux/string.h>
  13 #include <linux/platform_device.h>
  14 #include <linux/dma-mapping.h>
  15 #include <linux/gpio.h>
  16
  17 #include <mach/dma.h>
  18 #include <mach/map.h>
  19 #include <mach/spi-clocks.h>
  20 #include <mach/irqs.h>
  21
  22 #include <plat/s3c64xx-spi.h>
  23 #include <plat/gpio-cfg.h>
  24 #include <plat/devs.h>
  25
  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",
  30 };
  31
  32 /* SPI Controller platform_devices */
  33
  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.
  39  */
  40 static int s3c64xx_spi_cfg_gpio(struct platform_device *pdev)
  41 {
  42         unsigned int base;
  43
  44         switch (pdev->id) {
  45         case 0:
  46                 base = S3C64XX_GPC(0);
  47                 break;
  48
  49         case 1:
  50                 base = S3C64XX_GPC(4);
  51                 break;
  52
  53         default:
  54                 dev_err(&pdev->dev, "Invalid SPI Controller number!");
  55                 return -EINVAL;
  56         }
  57
  58         s3c_gpio_cfgall_range(base, 3,
  59                               S3C_GPIO_SFN(2), S3C_GPIO_PULL_UP);
  60
  61         return 0;
  62 }
  63
  64 static struct resource s3c64xx_spi0_resource[] = {
  65         [0] = {
  66                 .start = S3C64XX_PA_SPI0,
  67                 .end   = S3C64XX_PA_SPI0 + 0x100 - 1,
  68                 .flags = IORESOURCE_MEM,
  69         },
  70         [1] = {
  71                 .start = DMACH_SPI0_TX,
  72                 .end   = DMACH_SPI0_TX,
  73                 .flags = IORESOURCE_DMA,
  74         },
  75         [2] = {
  76                 .start = DMACH_SPI0_RX,
  77                 .end   = DMACH_SPI0_RX,
  78                 .flags = IORESOURCE_DMA,
  79         },
  80         [3] = {
  81                 .start = IRQ_SPI0,
  82                 .end   = IRQ_SPI0,
  83                 .flags = IORESOURCE_IRQ,
  84         },
  85 };
  86
  87 static struct s3c64xx_spi_info s3c64xx_spi0_pdata = {
  88         .cfg_gpio = s3c64xx_spi_cfg_gpio,
  89         .fifo_lvl_mask = 0x7f,
  90         .rx_lvl_offset = 13,
  91 };
  92
  93 static u64 spi_dmamask = DMA_BIT_MASK(32);
  94
  95 struct platform_device s3c64xx_device_spi0 = {
  96         .name             = "s3c64xx-spi",
  97         .id               = 0,
  98         .num_resources    = ARRAY_SIZE(s3c64xx_spi0_resource),
  99         .resource         = s3c64xx_spi0_resource,
 100         .dev = {
 101                 .dma_mask               = &spi_dmamask,
 102                 .coherent_dma_mask      = DMA_BIT_MASK(32),
 103                 .platform_data = &s3c64xx_spi0_pdata,
 104         },
 105 };
 106 EXPORT_SYMBOL(s3c64xx_device_spi0);
 107
 108 static struct resource s3c64xx_spi1_resource[] = {
 109         [0] = {
 110                 .start = S3C64XX_PA_SPI1,
 111                 .end   = S3C64XX_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 s3c64xx_spi1_pdata = {
 132         .cfg_gpio = s3c64xx_spi_cfg_gpio,
 133         .fifo_lvl_mask = 0x7f,
 134         .rx_lvl_offset = 13,
 135 };
 136
 137 struct platform_device s3c64xx_device_spi1 = {
 138         .name             = "s3c64xx-spi",
 139         .id               = 1,
 140         .num_resources    = ARRAY_SIZE(s3c64xx_spi1_resource),
 141         .resource         = s3c64xx_spi1_resource,
 142         .dev = {
 143                 .dma_mask               = &spi_dmamask,
 144                 .coherent_dma_mask      = DMA_BIT_MASK(32),
 145                 .platform_data = &s3c64xx_spi1_pdata,
 146         },
 147 };
 148 EXPORT_SYMBOL(s3c64xx_device_spi1);
 149
 150 void __init s3c64xx_spi_set_info(int cntrlr, int src_clk_nr, int num_cs)
 151 {
 152         struct s3c64xx_spi_info *pd;
 153
 154         /* Reject invalid configuration */
 155         if (!num_cs || src_clk_nr < 0
 156                         || src_clk_nr > S3C64XX_SPI_SRCCLK_48M) {
 157                 printk(KERN_ERR "%s: Invalid SPI configuration\n", __func__);
 158                 return;
 159         }
 160
 161         switch (cntrlr) {
 162         case 0:
 163                 pd = &s3c64xx_spi0_pdata;
 164                 break;
 165         case 1:
 166                 pd = &s3c64xx_spi1_pdata;
 167                 break;
 168         default:
 169                 printk(KERN_ERR "%s: Invalid SPI controller(%d)\n",
 170                                                         __func__, cntrlr);
 171                 return;
 172         }
 173
 174         pd->num_cs = num_cs;
 175         pd->src_clk_nr = src_clk_nr;
 176         pd->src_clk_name = spi_src_clks[src_clk_nr];
 177 }