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/export.h>
  14 #include <linux/platform_device.h>
  15 #include <linux/dma-mapping.h>
  16 #include <linux/gpio.h>
  17
  18 #include <mach/dma.h>
  19 #include <mach/map.h>
  20 #include <mach/spi-clocks.h>
  21 #include <mach/irqs.h>
  22
  23 #include <plat/s3c64xx-spi.h>
  24 #include <plat/gpio-cfg.h>
  25 #include <plat/devs.h>
  26
  27 static char *spi_src_clks[] = {
  28         [S3C64XX_SPI_SRCCLK_PCLK] = "pclk",
  29         [S3C64XX_SPI_SRCCLK_SPIBUS] = "spi-bus",
  30         [S3C64XX_SPI_SRCCLK_48M] = "spi_48m",
  31 };
  32
  33 /* SPI Controller platform_devices */
  34
  35 /* Since we emulate multi-cs capability, we do not touch the GPC-3,7.
  36  * The emulated CS is toggled by board specific mechanism, as it can
  37  * be either some immediate GPIO or some signal out of some other
  38  * chip in between ... or some yet another way.
  39  * We simply do not assume anything about CS.
  40  */
  41 static int s3c64xx_spi_cfg_gpio(struct platform_device *pdev)
  42 {
  43         unsigned int base;
  44
  45         switch (pdev->id) {
  46         case 0:
  47                 base = S3C64XX_GPC(0);
  48                 break;
  49
  50         case 1:
  51                 base = S3C64XX_GPC(4);
  52                 break;
  53
  54         default:
  55                 dev_err(&pdev->dev, "Invalid SPI Controller number!");
  56                 return -EINVAL;
  57         }
  58
  59         s3c_gpio_cfgall_range(base, 3,
  60                               S3C_GPIO_SFN(2), S3C_GPIO_PULL_UP);
  61
  62         return 0;
  63 }
  64
  65 static struct resource s3c64xx_spi0_resource[] = {
  66         [0] = {
  67                 .start = S3C64XX_PA_SPI0,
  68                 .end   = S3C64XX_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 s3c64xx_spi0_pdata = {
  89         .cfg_gpio = s3c64xx_spi_cfg_gpio,
  90         .fifo_lvl_mask = 0x7f,
  91         .rx_lvl_offset = 13,
  92         .tx_st_done = 21,
  93 };
  94
  95 static u64 spi_dmamask = DMA_BIT_MASK(32);
  96
  97 struct platform_device s3c64xx_device_spi0 = {
  98         .name             = "s3c64xx-spi",
  99         .id               = 0,
 100         .num_resources    = ARRAY_SIZE(s3c64xx_spi0_resource),
 101         .resource         = s3c64xx_spi0_resource,
 102         .dev = {
 103                 .dma_mask               = &spi_dmamask,
 104                 .coherent_dma_mask      = DMA_BIT_MASK(32),
 105                 .platform_data = &s3c64xx_spi0_pdata,
 106         },
 107 };
 108 EXPORT_SYMBOL(s3c64xx_device_spi0);
 109
 110 static struct resource s3c64xx_spi1_resource[] = {
 111         [0] = {
 112                 .start = S3C64XX_PA_SPI1,
 113                 .end   = S3C64XX_PA_SPI1 + 0x100 - 1,
 114                 .flags = IORESOURCE_MEM,
 115         },
 116         [1] = {
 117                 .start = DMACH_SPI1_TX,
 118                 .end   = DMACH_SPI1_TX,
 119                 .flags = IORESOURCE_DMA,
 120         },
 121         [2] = {
 122                 .start = DMACH_SPI1_RX,
 123                 .end   = DMACH_SPI1_RX,
 124                 .flags = IORESOURCE_DMA,
 125         },
 126         [3] = {
 127                 .start = IRQ_SPI1,
 128                 .end   = IRQ_SPI1,
 129                 .flags = IORESOURCE_IRQ,
 130         },
 131 };
 132
 133 static struct s3c64xx_spi_info s3c64xx_spi1_pdata = {
 134         .cfg_gpio = s3c64xx_spi_cfg_gpio,
 135         .fifo_lvl_mask = 0x7f,
 136         .rx_lvl_offset = 13,
 137         .tx_st_done = 21,
 138 };
 139
 140 struct platform_device s3c64xx_device_spi1 = {
 141         .name             = "s3c64xx-spi",
 142         .id               = 1,
 143         .num_resources    = ARRAY_SIZE(s3c64xx_spi1_resource),
 144         .resource         = s3c64xx_spi1_resource,
 145         .dev = {
 146                 .dma_mask               = &spi_dmamask,
 147                 .coherent_dma_mask      = DMA_BIT_MASK(32),
 148                 .platform_data = &s3c64xx_spi1_pdata,
 149         },
 150 };
 151 EXPORT_SYMBOL(s3c64xx_device_spi1);
 152
 153 void __init s3c64xx_spi_set_info(int cntrlr, int src_clk_nr, int num_cs)
 154 {
 155         struct s3c64xx_spi_info *pd;
 156
 157         /* Reject invalid configuration */
 158         if (!num_cs || src_clk_nr < 0
 159                         || src_clk_nr > S3C64XX_SPI_SRCCLK_48M) {
 160                 printk(KERN_ERR "%s: Invalid SPI configuration\n", __func__);
 161                 return;
 162         }
 163
 164         switch (cntrlr) {
 165         case 0:
 166                 pd = &s3c64xx_spi0_pdata;
 167                 break;
 168         case 1:
 169                 pd = &s3c64xx_spi1_pdata;
 170                 break;
 171         default:
 172                 printk(KERN_ERR "%s: Invalid SPI controller(%d)\n",
 173                                                         __func__, cntrlr);
 174                 return;
 175         }
 176
 177         pd->num_cs = num_cs;
 178         pd->src_clk_nr = src_clk_nr;
 179         pd->src_clk_name = spi_src_clks[src_clk_nr];
 180 }