target/linux/ramips/files/arch/mips/ralink/rt305x/devices.c

   1 /*
   2  *  Ralink RT305x SoC platform device registration
   3  *
   4  *  Copyright (C) 2009 Gabor Juhos <juhosg@openwrt.org>
   5  *
   6  *  This program is free software; you can redistribute it and/or modify it
   7  *  under the terms of the GNU General Public License version 2 as published
   8  *  by the Free Software Foundation.
   9  */
  10
  11 #include <linux/kernel.h>
  12 #include <linux/platform_device.h>
  13 #include <linux/mtd/mtd.h>
  14 #include <linux/mtd/physmap.h>
  15
  16 #include <asm/addrspace.h>
  17
  18 #include <asm/mach-ralink/rt305x.h>
  19 #include <asm/mach-ralink/rt305x_regs.h>
  20 #include "devices.h"
  21
  22 static struct resource rt305x_flash0_resources[] = {
  23         {
  24                 .flags  = IORESOURCE_MEM,
  25                 .start  = KSEG1ADDR(RT305X_FLASH0_BASE),
  26                 .end    = KSEG1ADDR(RT305X_FLASH0_BASE) +
  27                           RT305X_FLASH0_SIZE - 1,
  28         },
  29 };
  30
  31 static struct platform_device rt305x_flash0_device = {
  32         .name           = "physmap-flash",
  33         .resource       = rt305x_flash0_resources,
  34         .num_resources  = ARRAY_SIZE(rt305x_flash0_resources),
  35 };
  36
  37 static struct resource rt305x_flash1_resources[] = {
  38         {
  39                 .flags  = IORESOURCE_MEM,
  40                 .start  = KSEG1ADDR(RT305X_FLASH1_BASE),
  41                 .end    = KSEG1ADDR(RT305X_FLASH1_BASE) +
  42                           RT305X_FLASH1_SIZE - 1,
  43         },
  44 };
  45
  46 static struct platform_device rt305x_flash1_device = {
  47         .name           = "physmap-flash",
  48         .resource       = rt305x_flash1_resources,
  49         .num_resources  = ARRAY_SIZE(rt305x_flash1_resources),
  50 };
  51
  52 static int rt305x_flash_instance __initdata;
  53 void __init rt305x_register_flash(unsigned int id,
  54                                   struct physmap_flash_data *pdata)
  55 {
  56         struct platform_device *pdev;
  57         u32 t;
  58         int reg;
  59
  60         switch (id) {
  61         case 0:
  62                 pdev = &rt305x_flash0_device;
  63                 reg = MEMC_REG_FLASH_CFG0;
  64                 break;
  65         case 1:
  66                 pdev = &rt305x_flash1_device;
  67                 reg = MEMC_REG_FLASH_CFG1;
  68                 break;
  69         default:
  70                 return;
  71         }
  72
  73         t = rt305x_memc_rr(reg);
  74         t = (t >> FLASH_CFG_WIDTH_SHIFT) & FLASH_CFG_WIDTH_MASK;
  75
  76         switch (t) {
  77         case FLASH_CFG_WIDTH_8BIT:
  78                 pdata->width = 1;
  79                 break;
  80         case FLASH_CFG_WIDTH_16BIT:
  81                 pdata->width = 2;
  82                 break;
  83         case FLASH_CFG_WIDTH_32BIT:
  84                 pdata->width = 4;
  85                 break;
  86         default:
  87                 printk(KERN_ERR "RT305x: flash bank%u witdh is invalid\n", id);
  88                 return;
  89         }
  90
  91         pdev->dev.platform_data = pdata;
  92         pdev->id = rt305x_flash_instance;
  93
  94         platform_device_register(pdev);
  95         rt305x_flash_instance++;
  96 }