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Linux/arch/arm/mach-ep93xx/snappercl15.c

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  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/i2c-gpio.h>
 25 #include <linux/fb.h>
 26 
 27 #include <linux/mtd/partitions.h>
 28 #include <linux/mtd/nand.h>
 29 
 30 #include <mach/hardware.h>
 31 #include <linux/platform_data/video-ep93xx.h>
 32 #include <mach/gpio-ep93xx.h>
 33 
 34 #include <asm/mach-types.h>
 35 #include <asm/mach/arch.h>
 36 
 37 #include "soc.h"
 38 
 39 #define SNAPPERCL15_NAND_BASE   (EP93XX_CS7_PHYS_BASE + SZ_16M)
 40 
 41 #define SNAPPERCL15_NAND_WPN    (1 << 8)  /* Write protect (active low) */
 42 #define SNAPPERCL15_NAND_ALE    (1 << 9)  /* Address latch */
 43 #define SNAPPERCL15_NAND_CLE    (1 << 10) /* Command latch */
 44 #define SNAPPERCL15_NAND_CEN    (1 << 11) /* Chip enable (active low) */
 45 #define SNAPPERCL15_NAND_RDY    (1 << 14) /* Device ready */
 46 
 47 #define NAND_CTRL_ADDR(chip)    (chip->IO_ADDR_W + 0x40)
 48 
 49 static void snappercl15_nand_cmd_ctrl(struct mtd_info *mtd, int cmd,
 50                                       unsigned int ctrl)
 51 {
 52         struct nand_chip *chip = mtd->priv;
 53         static u16 nand_state = SNAPPERCL15_NAND_WPN;
 54         u16 set;
 55 
 56         if (ctrl & NAND_CTRL_CHANGE) {
 57                 set = SNAPPERCL15_NAND_CEN | SNAPPERCL15_NAND_WPN;
 58 
 59                 if (ctrl & NAND_NCE)
 60                         set &= ~SNAPPERCL15_NAND_CEN;
 61                 if (ctrl & NAND_CLE)
 62                         set |= SNAPPERCL15_NAND_CLE;
 63                 if (ctrl & NAND_ALE)
 64                         set |= SNAPPERCL15_NAND_ALE;
 65 
 66                 nand_state &= ~(SNAPPERCL15_NAND_CEN |
 67                                 SNAPPERCL15_NAND_CLE |
 68                                 SNAPPERCL15_NAND_ALE);
 69                 nand_state |= set;
 70                 __raw_writew(nand_state, NAND_CTRL_ADDR(chip));
 71         }
 72 
 73         if (cmd != NAND_CMD_NONE)
 74                 __raw_writew((cmd & 0xff) | nand_state, chip->IO_ADDR_W);
 75 }
 76 
 77 static int snappercl15_nand_dev_ready(struct mtd_info *mtd)
 78 {
 79         struct nand_chip *chip = mtd->priv;
 80 
 81         return !!(__raw_readw(NAND_CTRL_ADDR(chip)) & SNAPPERCL15_NAND_RDY);
 82 }
 83 
 84 static struct mtd_partition snappercl15_nand_parts[] = {
 85         {
 86                 .name           = "Kernel",
 87                 .offset         = 0,
 88                 .size           = SZ_2M,
 89         },
 90         {
 91                 .name           = "Filesystem",
 92                 .offset         = MTDPART_OFS_APPEND,
 93                 .size           = MTDPART_SIZ_FULL,
 94         },
 95 };
 96 
 97 static struct platform_nand_data snappercl15_nand_data = {
 98         .chip = {
 99                 .nr_chips               = 1,
100                 .partitions             = snappercl15_nand_parts,
101                 .nr_partitions          = ARRAY_SIZE(snappercl15_nand_parts),
102                 .chip_delay             = 25,
103         },
104         .ctrl = {
105                 .dev_ready              = snappercl15_nand_dev_ready,
106                 .cmd_ctrl               = snappercl15_nand_cmd_ctrl,
107         },
108 };
109 
110 static struct resource snappercl15_nand_resource[] = {
111         {
112                 .start          = SNAPPERCL15_NAND_BASE,
113                 .end            = SNAPPERCL15_NAND_BASE + SZ_4K - 1,
114                 .flags          = IORESOURCE_MEM,
115         },
116 };
117 
118 static struct platform_device snappercl15_nand_device = {
119         .name                   = "gen_nand",
120         .id                     = -1,
121         .dev.platform_data      = &snappercl15_nand_data,
122         .resource               = snappercl15_nand_resource,
123         .num_resources          = ARRAY_SIZE(snappercl15_nand_resource),
124 };
125 
126 static struct ep93xx_eth_data __initdata snappercl15_eth_data = {
127         .phy_id                 = 1,
128 };
129 
130 static struct i2c_gpio_platform_data __initdata snappercl15_i2c_gpio_data = {
131         .sda_pin                = EP93XX_GPIO_LINE_EEDAT,
132         .sda_is_open_drain      = 0,
133         .scl_pin                = EP93XX_GPIO_LINE_EECLK,
134         .scl_is_open_drain      = 0,
135         .udelay                 = 0,
136         .timeout                = 0,
137 };
138 
139 static struct i2c_board_info __initdata snappercl15_i2c_data[] = {
140         {
141                 /* Audio codec */
142                 I2C_BOARD_INFO("tlv320aic23", 0x1a),
143         },
144 };
145 
146 static struct ep93xxfb_mach_info __initdata snappercl15_fb_info = {
147         .num_modes              = EP93XXFB_USE_MODEDB,
148         .bpp                    = 16,
149 };
150 
151 static struct platform_device snappercl15_audio_device = {
152         .name           = "snappercl15-audio",
153         .id             = -1,
154 };
155 
156 static void __init snappercl15_register_audio(void)
157 {
158         ep93xx_register_i2s();
159         platform_device_register(&snappercl15_audio_device);
160 }
161 
162 static void __init snappercl15_init_machine(void)
163 {
164         ep93xx_init_devices();
165         ep93xx_register_eth(&snappercl15_eth_data, 1);
166         ep93xx_register_i2c(&snappercl15_i2c_gpio_data, snappercl15_i2c_data,
167                             ARRAY_SIZE(snappercl15_i2c_data));
168         ep93xx_register_fb(&snappercl15_fb_info);
169         snappercl15_register_audio();
170         platform_device_register(&snappercl15_nand_device);
171 }
172 
173 MACHINE_START(SNAPPER_CL15, "Bluewater Systems Snapper CL15")
174         /* Maintainer: Ryan Mallon */
175         .atag_offset    = 0x100,
176         .map_io         = ep93xx_map_io,
177         .init_irq       = ep93xx_init_irq,
178         .init_time      = ep93xx_timer_init,
179         .init_machine   = snappercl15_init_machine,
180         .init_late      = ep93xx_init_late,
181         .restart        = ep93xx_restart,
182 MACHINE_END
183 

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