arch/arm/mach-ep93xx/snappercl15.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * arch/arm/mach-ep93xx/snappercl15.c
   4  * Bluewater Systems Snapper CL15 system module
   5  *
   6  * Copyright (C) 2009 Bluewater Systems Ltd
   7  * Author: Ryan Mallon
   8  *
   9  * NAND code adapted from driver by:
  10  *   Andre Renaud <andre@bluewatersys.com>
  11  *   James R. McKaskill
  12  */
  13
  14 #include <linux/platform_device.h>
  15 #include <linux/kernel.h>
  16 #include <linux/init.h>
  17 #include <linux/io.h>
  18 #include <linux/i2c.h>
  19 #include <linux/fb.h>
  20
  21 #include <linux/mtd/platnand.h>
  22
  23 #include "hardware.h"
  24 #include <linux/platform_data/video-ep93xx.h>
  25 #include "gpio-ep93xx.h"
  26
  27 #include <asm/mach-types.h>
  28 #include <asm/mach/arch.h>
  29
  30 #include "soc.h"
  31
  32 #define SNAPPERCL15_NAND_BASE   (EP93XX_CS7_PHYS_BASE + SZ_16M)
  33
  34 #define SNAPPERCL15_NAND_WPN    (1 << 8)  /* Write protect (active low) */
  35 #define SNAPPERCL15_NAND_ALE    (1 << 9)  /* Address latch */
  36 #define SNAPPERCL15_NAND_CLE    (1 << 10) /* Command latch */
  37 #define SNAPPERCL15_NAND_CEN    (1 << 11) /* Chip enable (active low) */
  38 #define SNAPPERCL15_NAND_RDY    (1 << 14) /* Device ready */
  39
  40 #define NAND_CTRL_ADDR(chip)    (chip->legacy.IO_ADDR_W + 0x40)
  41
  42 static void snappercl15_nand_cmd_ctrl(struct nand_chip *chip, int cmd,
  43                                       unsigned int ctrl)
  44 {
  45         static u16 nand_state = SNAPPERCL15_NAND_WPN;
  46         u16 set;
  47
  48         if (ctrl & NAND_CTRL_CHANGE) {
  49                 set = SNAPPERCL15_NAND_CEN | SNAPPERCL15_NAND_WPN;
  50
  51                 if (ctrl & NAND_NCE)
  52                         set &= ~SNAPPERCL15_NAND_CEN;
  53                 if (ctrl & NAND_CLE)
  54                         set |= SNAPPERCL15_NAND_CLE;
  55                 if (ctrl & NAND_ALE)
  56                         set |= SNAPPERCL15_NAND_ALE;
  57
  58                 nand_state &= ~(SNAPPERCL15_NAND_CEN |
  59                                 SNAPPERCL15_NAND_CLE |
  60                                 SNAPPERCL15_NAND_ALE);
  61                 nand_state |= set;
  62                 __raw_writew(nand_state, NAND_CTRL_ADDR(chip));
  63         }
  64
  65         if (cmd != NAND_CMD_NONE)
  66                 __raw_writew((cmd & 0xff) | nand_state,
  67                              chip->legacy.IO_ADDR_W);
  68 }
  69
  70 static int snappercl15_nand_dev_ready(struct nand_chip *chip)
  71 {
  72         return !!(__raw_readw(NAND_CTRL_ADDR(chip)) & SNAPPERCL15_NAND_RDY);
  73 }
  74
  75 static struct mtd_partition snappercl15_nand_parts[] = {
  76         {
  77                 .name           = "Kernel",
  78                 .offset         = 0,
  79                 .size           = SZ_2M,
  80         },
  81         {
  82                 .name           = "Filesystem",
  83                 .offset         = MTDPART_OFS_APPEND,
  84                 .size           = MTDPART_SIZ_FULL,
  85         },
  86 };
  87
  88 static struct platform_nand_data snappercl15_nand_data = {
  89         .chip = {
  90                 .nr_chips               = 1,
  91                 .partitions             = snappercl15_nand_parts,
  92                 .nr_partitions          = ARRAY_SIZE(snappercl15_nand_parts),
  93                 .chip_delay             = 25,
  94         },
  95         .ctrl = {
  96                 .dev_ready              = snappercl15_nand_dev_ready,
  97                 .cmd_ctrl               = snappercl15_nand_cmd_ctrl,
  98         },
  99 };
 100
 101 static struct resource snappercl15_nand_resource[] = {
 102         {
 103                 .start          = SNAPPERCL15_NAND_BASE,
 104                 .end            = SNAPPERCL15_NAND_BASE + SZ_4K - 1,
 105                 .flags          = IORESOURCE_MEM,
 106         },
 107 };
 108
 109 static struct platform_device snappercl15_nand_device = {
 110         .name                   = "gen_nand",
 111         .id                     = -1,
 112         .dev.platform_data      = &snappercl15_nand_data,
 113         .resource               = snappercl15_nand_resource,
 114         .num_resources          = ARRAY_SIZE(snappercl15_nand_resource),
 115 };
 116
 117 static struct ep93xx_eth_data __initdata snappercl15_eth_data = {
 118         .phy_id                 = 1,
 119 };
 120
 121 static struct i2c_board_info __initdata snappercl15_i2c_data[] = {
 122         {
 123                 /* Audio codec */
 124                 I2C_BOARD_INFO("tlv320aic23", 0x1a),
 125         },
 126 };
 127
 128 static struct ep93xxfb_mach_info __initdata snappercl15_fb_info = {
 129 };
 130
 131 static struct platform_device snappercl15_audio_device = {
 132         .name           = "snappercl15-audio",
 133         .id             = -1,
 134 };
 135
 136 static void __init snappercl15_register_audio(void)
 137 {
 138         ep93xx_register_i2s();
 139         platform_device_register(&snappercl15_audio_device);
 140 }
 141
 142 static void __init snappercl15_init_machine(void)
 143 {
 144         ep93xx_init_devices();
 145         ep93xx_register_eth(&snappercl15_eth_data, 1);
 146         ep93xx_register_i2c(snappercl15_i2c_data,
 147                             ARRAY_SIZE(snappercl15_i2c_data));
 148         ep93xx_register_fb(&snappercl15_fb_info);
 149         snappercl15_register_audio();
 150         platform_device_register(&snappercl15_nand_device);
 151 }
 152
 153 MACHINE_START(SNAPPER_CL15, "Bluewater Systems Snapper CL15")
 154         /* Maintainer: Ryan Mallon */
 155         .atag_offset    = 0x100,
 156         .map_io         = ep93xx_map_io,
 157         .init_irq       = ep93xx_init_irq,
 158         .init_time      = ep93xx_timer_init,
 159         .init_machine   = snappercl15_init_machine,
 160         .restart        = ep93xx_restart,
 161 MACHINE_END