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/platnand.h>
  27
  28 #include <mach/hardware.h>
  29 #include <linux/platform_data/video-ep93xx.h>
  30 #include <mach/gpio-ep93xx.h>
  31
  32 #include <asm/mach-types.h>
  33 #include <asm/mach/arch.h>
  34
  35 #include "soc.h"
  36
  37 #define SNAPPERCL15_NAND_BASE   (EP93XX_CS7_PHYS_BASE + SZ_16M)
  38
  39 #define SNAPPERCL15_NAND_WPN    (1 << 8)  /* Write protect (active low) */
  40 #define SNAPPERCL15_NAND_ALE    (1 << 9)  /* Address latch */
  41 #define SNAPPERCL15_NAND_CLE    (1 << 10) /* Command latch */
  42 #define SNAPPERCL15_NAND_CEN    (1 << 11) /* Chip enable (active low) */
  43 #define SNAPPERCL15_NAND_RDY    (1 << 14) /* Device ready */
  44
  45 #define NAND_CTRL_ADDR(chip)    (chip->legacy.IO_ADDR_W + 0x40)
  46
  47 static void snappercl15_nand_cmd_ctrl(struct nand_chip *chip, int cmd,
  48                                       unsigned int ctrl)
  49 {
  50         static u16 nand_state = SNAPPERCL15_NAND_WPN;
  51         u16 set;
  52
  53         if (ctrl & NAND_CTRL_CHANGE) {
  54                 set = SNAPPERCL15_NAND_CEN | SNAPPERCL15_NAND_WPN;
  55
  56                 if (ctrl & NAND_NCE)
  57                         set &= ~SNAPPERCL15_NAND_CEN;
  58                 if (ctrl & NAND_CLE)
  59                         set |= SNAPPERCL15_NAND_CLE;
  60                 if (ctrl & NAND_ALE)
  61                         set |= SNAPPERCL15_NAND_ALE;
  62
  63                 nand_state &= ~(SNAPPERCL15_NAND_CEN |
  64                                 SNAPPERCL15_NAND_CLE |
  65                                 SNAPPERCL15_NAND_ALE);
  66                 nand_state |= set;
  67                 __raw_writew(nand_state, NAND_CTRL_ADDR(chip));
  68         }
  69
  70         if (cmd != NAND_CMD_NONE)
  71                 __raw_writew((cmd & 0xff) | nand_state,
  72                              chip->legacy.IO_ADDR_W);
  73 }
  74
  75 static int snappercl15_nand_dev_ready(struct nand_chip *chip)
  76 {
  77         return !!(__raw_readw(NAND_CTRL_ADDR(chip)) & SNAPPERCL15_NAND_RDY);
  78 }
  79
  80 static struct mtd_partition snappercl15_nand_parts[] = {
  81         {
  82                 .name           = "Kernel",
  83                 .offset         = 0,
  84                 .size           = SZ_2M,
  85         },
  86         {
  87                 .name           = "Filesystem",
  88                 .offset         = MTDPART_OFS_APPEND,
  89                 .size           = MTDPART_SIZ_FULL,
  90         },
  91 };
  92
  93 static struct platform_nand_data snappercl15_nand_data = {
  94         .chip = {
  95                 .nr_chips               = 1,
  96                 .partitions             = snappercl15_nand_parts,
  97                 .nr_partitions          = ARRAY_SIZE(snappercl15_nand_parts),
  98                 .chip_delay             = 25,
  99         },
 100         .ctrl = {
 101                 .dev_ready              = snappercl15_nand_dev_ready,
 102                 .cmd_ctrl               = snappercl15_nand_cmd_ctrl,
 103         },
 104 };
 105
 106 static struct resource snappercl15_nand_resource[] = {
 107         {
 108                 .start          = SNAPPERCL15_NAND_BASE,
 109                 .end            = SNAPPERCL15_NAND_BASE + SZ_4K - 1,
 110                 .flags          = IORESOURCE_MEM,
 111         },
 112 };
 113
 114 static struct platform_device snappercl15_nand_device = {
 115         .name                   = "gen_nand",
 116         .id                     = -1,
 117         .dev.platform_data      = &snappercl15_nand_data,
 118         .resource               = snappercl15_nand_resource,
 119         .num_resources          = ARRAY_SIZE(snappercl15_nand_resource),
 120 };
 121
 122 static struct ep93xx_eth_data __initdata snappercl15_eth_data = {
 123         .phy_id                 = 1,
 124 };
 125
 126 static struct i2c_board_info __initdata snappercl15_i2c_data[] = {
 127         {
 128                 /* Audio codec */
 129                 I2C_BOARD_INFO("tlv320aic23", 0x1a),
 130         },
 131 };
 132
 133 static struct ep93xxfb_mach_info __initdata snappercl15_fb_info = {
 134 };
 135
 136 static struct platform_device snappercl15_audio_device = {
 137         .name           = "snappercl15-audio",
 138         .id             = -1,
 139 };
 140
 141 static void __init snappercl15_register_audio(void)
 142 {
 143         ep93xx_register_i2s();
 144         platform_device_register(&snappercl15_audio_device);
 145 }
 146
 147 static void __init snappercl15_init_machine(void)
 148 {
 149         ep93xx_init_devices();
 150         ep93xx_register_eth(&snappercl15_eth_data, 1);
 151         ep93xx_register_i2c(snappercl15_i2c_data,
 152                             ARRAY_SIZE(snappercl15_i2c_data));
 153         ep93xx_register_fb(&snappercl15_fb_info);
 154         snappercl15_register_audio();
 155         platform_device_register(&snappercl15_nand_device);
 156 }
 157
 158 MACHINE_START(SNAPPER_CL15, "Bluewater Systems Snapper CL15")
 159         /* Maintainer: Ryan Mallon */
 160         .atag_offset    = 0x100,
 161         .map_io         = ep93xx_map_io,
 162         .init_irq       = ep93xx_init_irq,
 163         .init_time      = ep93xx_timer_init,
 164         .init_machine   = snappercl15_init_machine,
 165         .init_late      = ep93xx_init_late,
 166         .restart        = ep93xx_restart,
 167 MACHINE_END