arch/arm/mach-ep93xx/snappercl15.c

   1 /*
   2  * arch/arm/mach-ep93xx/snappercl15.c
   3  * Bluewater Systems Snapper CL15 system module
   4  *
   5  * Copyright (C) 2009 Bluewater Systems Ltd
   6  * Author: Ryan Mallon
   7  *
   8  * NAND code adapted from driver by:
   9  *   Andre Renaud <andre@bluewatersys.com>
  10  *   James R. McKaskill
  11  *
  12  * This program is free software; you can redistribute it and/or modify
  13  * it under the terms of the GNU General Public License as published by
  14  * the Free Software Foundation; either version 2 of the License, or (at
  15  * your option) any later version.
  16  *
  17  */
  18
  19 #include <linux/platform_device.h>
  20 #include <linux/kernel.h>
  21 #include <linux/init.h>
  22 #include <linux/io.h>
  23 #include <linux/i2c.h>
  24 #include <linux/fb.h>
  25
  26 #include <linux/mtd/partitions.h>
  27 #include <linux/mtd/rawnand.h>
  28
  29 #include <mach/hardware.h>
  30 #include <linux/platform_data/video-ep93xx.h>
  31 #include <mach/gpio-ep93xx.h>
  32
  33 #include <asm/mach-types.h>
  34 #include <asm/mach/arch.h>
  35
  36 #include "soc.h"
  37
  38 #define SNAPPERCL15_NAND_BASE   (EP93XX_CS7_PHYS_BASE + SZ_16M)
  39
  40 #define SNAPPERCL15_NAND_WPN    (1 << 8)  /* Write protect (active low) */
  41 #define SNAPPERCL15_NAND_ALE    (1 << 9)  /* Address latch */
  42 #define SNAPPERCL15_NAND_CLE    (1 << 10) /* Command latch */
  43 #define SNAPPERCL15_NAND_CEN    (1 << 11) /* Chip enable (active low) */
  44 #define SNAPPERCL15_NAND_RDY    (1 << 14) /* Device ready */
  45
  46 #define NAND_CTRL_ADDR(chip)    (chip->IO_ADDR_W + 0x40)
  47
  48 static void snappercl15_nand_cmd_ctrl(struct mtd_info *mtd, int cmd,
  49                                       unsigned int ctrl)
  50 {
  51         struct nand_chip *chip = mtd_to_nand(mtd);
  52         static u16 nand_state = SNAPPERCL15_NAND_WPN;
  53         u16 set;
  54
  55         if (ctrl & NAND_CTRL_CHANGE) {
  56                 set = SNAPPERCL15_NAND_CEN | SNAPPERCL15_NAND_WPN;
  57
  58                 if (ctrl & NAND_NCE)
  59                         set &= ~SNAPPERCL15_NAND_CEN;
  60                 if (ctrl & NAND_CLE)
  61                         set |= SNAPPERCL15_NAND_CLE;
  62                 if (ctrl & NAND_ALE)
  63                         set |= SNAPPERCL15_NAND_ALE;
  64
  65                 nand_state &= ~(SNAPPERCL15_NAND_CEN |
  66                                 SNAPPERCL15_NAND_CLE |
  67                                 SNAPPERCL15_NAND_ALE);
  68                 nand_state |= set;
  69                 __raw_writew(nand_state, NAND_CTRL_ADDR(chip));
  70         }
  71
  72         if (cmd != NAND_CMD_NONE)
  73                 __raw_writew((cmd & 0xff) | nand_state, chip->IO_ADDR_W);
  74 }
  75
  76 static int snappercl15_nand_dev_ready(struct mtd_info *mtd)
  77 {
  78         struct nand_chip *chip = mtd_to_nand(mtd);
  79
  80         return !!(__raw_readw(NAND_CTRL_ADDR(chip)) & SNAPPERCL15_NAND_RDY);
  81 }
  82
  83 static struct mtd_partition snappercl15_nand_parts[] = {
  84         {
  85                 .name           = "Kernel",
  86                 .offset         = 0,
  87                 .size           = SZ_2M,
  88         },
  89         {
  90                 .name           = "Filesystem",
  91                 .offset         = MTDPART_OFS_APPEND,
  92                 .size           = MTDPART_SIZ_FULL,
  93         },
  94 };
  95
  96 static struct platform_nand_data snappercl15_nand_data = {
  97         .chip = {
  98                 .nr_chips               = 1,
  99                 .partitions             = snappercl15_nand_parts,
 100                 .nr_partitions          = ARRAY_SIZE(snappercl15_nand_parts),
 101                 .chip_delay             = 25,
 102         },
 103         .ctrl = {
 104                 .dev_ready              = snappercl15_nand_dev_ready,
 105                 .cmd_ctrl               = snappercl15_nand_cmd_ctrl,
 106         },
 107 };
 108
 109 static struct resource snappercl15_nand_resource[] = {
 110         {
 111                 .start          = SNAPPERCL15_NAND_BASE,
 112                 .end            = SNAPPERCL15_NAND_BASE + SZ_4K - 1,
 113                 .flags          = IORESOURCE_MEM,
 114         },
 115 };
 116
 117 static struct platform_device snappercl15_nand_device = {
 118         .name                   = "gen_nand",
 119         .id                     = -1,
 120         .dev.platform_data      = &snappercl15_nand_data,
 121         .resource               = snappercl15_nand_resource,
 122         .num_resources          = ARRAY_SIZE(snappercl15_nand_resource),
 123 };
 124
 125 static struct ep93xx_eth_data __initdata snappercl15_eth_data = {
 126         .phy_id                 = 1,
 127 };
 128
 129 static struct i2c_board_info __initdata snappercl15_i2c_data[] = {
 130         {
 131                 /* Audio codec */
 132                 I2C_BOARD_INFO("tlv320aic23", 0x1a),
 133         },
 134 };
 135
 136 static struct ep93xxfb_mach_info __initdata snappercl15_fb_info = {
 137 };
 138
 139 static struct platform_device snappercl15_audio_device = {
 140         .name           = "snappercl15-audio",
 141         .id             = -1,
 142 };
 143
 144 static void __init snappercl15_register_audio(void)
 145 {
 146         ep93xx_register_i2s();
 147         platform_device_register(&snappercl15_audio_device);
 148 }
 149
 150 static void __init snappercl15_init_machine(void)
 151 {
 152         ep93xx_init_devices();
 153         ep93xx_register_eth(&snappercl15_eth_data, 1);
 154         ep93xx_register_i2c(snappercl15_i2c_data,
 155                             ARRAY_SIZE(snappercl15_i2c_data));
 156         ep93xx_register_fb(&snappercl15_fb_info);
 157         snappercl15_register_audio();
 158         platform_device_register(&snappercl15_nand_device);
 159 }
 160
 161 MACHINE_START(SNAPPER_CL15, "Bluewater Systems Snapper CL15")
 162         /* Maintainer: Ryan Mallon */
 163         .atag_offset    = 0x100,
 164         .map_io         = ep93xx_map_io,
 165         .init_irq       = ep93xx_init_irq,
 166         .init_time      = ep93xx_timer_init,
 167         .init_machine   = snappercl15_init_machine,
 168         .init_late      = ep93xx_init_late,
 169         .restart        = ep93xx_restart,
 170 MACHINE_END