arm/mach-ep93xx/snappercl15.c

0001 // SPDX-License-Identifier: GPL-2.0-or-later
0002 /*
0003  * arch/arm/mach-ep93xx/snappercl15.c
0004  * Bluewater Systems Snapper CL15 system module
0005  *
0006  * Copyright (C) 2009 Bluewater Systems Ltd
0007  * Author: Ryan Mallon
0008  *
0009  * NAND code adapted from driver by:
0010  *   Andre Renaud <andre@bluewatersys.com>
0011  *   James R. McKaskill
0012  */
0013
0014 #include <linux/platform_device.h>
0015 #include <linux/kernel.h>
0016 #include <linux/init.h>
0017 #include <linux/io.h>
0018 #include <linux/i2c.h>
0019 #include <linux/fb.h>
0020
0021 #include <linux/mtd/platnand.h>
0022
0023 #include "hardware.h"
0024 #include <linux/platform_data/video-ep93xx.h>
0025 #include "gpio-ep93xx.h"
0026
0027 #include <asm/mach-types.h>
0028 #include <asm/mach/arch.h>
0029
0030 #include "soc.h"
0031
0032 #define SNAPPERCL15_NAND_BASE   (EP93XX_CS7_PHYS_BASE + SZ_16M)
0033
0034 #define SNAPPERCL15_NAND_WPN    (1 << 8)  /* Write protect (active low) */
0035 #define SNAPPERCL15_NAND_ALE    (1 << 9)  /* Address latch */
0036 #define SNAPPERCL15_NAND_CLE    (1 << 10) /* Command latch */
0037 #define SNAPPERCL15_NAND_CEN    (1 << 11) /* Chip enable (active low) */
0038 #define SNAPPERCL15_NAND_RDY    (1 << 14) /* Device ready */
0039
0040 #define NAND_CTRL_ADDR(chip)    (chip->legacy.IO_ADDR_W + 0x40)
0041
0042 static void snappercl15_nand_cmd_ctrl(struct nand_chip *chip, int cmd,
0043                       unsigned int ctrl)
0044 {
0045     static u16 nand_state = SNAPPERCL15_NAND_WPN;
0046     u16 set;
0047
0048     if (ctrl & NAND_CTRL_CHANGE) {
0049         set = SNAPPERCL15_NAND_CEN | SNAPPERCL15_NAND_WPN;
0050
0051         if (ctrl & NAND_NCE)
0052             set &= ~SNAPPERCL15_NAND_CEN;
0053         if (ctrl & NAND_CLE)
0054             set |= SNAPPERCL15_NAND_CLE;
0055         if (ctrl & NAND_ALE)
0056             set |= SNAPPERCL15_NAND_ALE;
0057
0058         nand_state &= ~(SNAPPERCL15_NAND_CEN |
0059                 SNAPPERCL15_NAND_CLE |
0060                 SNAPPERCL15_NAND_ALE);
0061         nand_state |= set;
0062         __raw_writew(nand_state, NAND_CTRL_ADDR(chip));
0063     }
0064
0065     if (cmd != NAND_CMD_NONE)
0066         __raw_writew((cmd & 0xff) | nand_state,
0067                  chip->legacy.IO_ADDR_W);
0068 }
0069
0070 static int snappercl15_nand_dev_ready(struct nand_chip *chip)
0071 {
0072     return !!(__raw_readw(NAND_CTRL_ADDR(chip)) & SNAPPERCL15_NAND_RDY);
0073 }
0074
0075 static struct mtd_partition snappercl15_nand_parts[] = {
0076     {
0077         .name       = "Kernel",
0078         .offset     = 0,
0079         .size       = SZ_2M,
0080     },
0081     {
0082         .name       = "Filesystem",
0083         .offset     = MTDPART_OFS_APPEND,
0084         .size       = MTDPART_SIZ_FULL,
0085     },
0086 };
0087
0088 static struct platform_nand_data snappercl15_nand_data = {
0089     .chip = {
0090         .nr_chips       = 1,
0091         .partitions     = snappercl15_nand_parts,
0092         .nr_partitions      = ARRAY_SIZE(snappercl15_nand_parts),
0093         .chip_delay     = 25,
0094     },
0095     .ctrl = {
0096         .dev_ready      = snappercl15_nand_dev_ready,
0097         .cmd_ctrl       = snappercl15_nand_cmd_ctrl,
0098     },
0099 };
0100
0101 static struct resource snappercl15_nand_resource[] = {
0102     {
0103         .start      = SNAPPERCL15_NAND_BASE,
0104         .end        = SNAPPERCL15_NAND_BASE + SZ_4K - 1,
0105         .flags      = IORESOURCE_MEM,
0106     },
0107 };
0108
0109 static struct platform_device snappercl15_nand_device = {
0110     .name           = "gen_nand",
0111     .id         = -1,
0112     .dev.platform_data  = &snappercl15_nand_data,
0113     .resource       = snappercl15_nand_resource,
0114     .num_resources      = ARRAY_SIZE(snappercl15_nand_resource),
0115 };
0116
0117 static struct ep93xx_eth_data __initdata snappercl15_eth_data = {
0118     .phy_id         = 1,
0119 };
0120
0121 static struct i2c_board_info __initdata snappercl15_i2c_data[] = {
0122     {
0123         /* Audio codec */
0124         I2C_BOARD_INFO("tlv320aic23", 0x1a),
0125     },
0126 };
0127
0128 static struct ep93xxfb_mach_info __initdata snappercl15_fb_info = {
0129 };
0130
0131 static struct platform_device snappercl15_audio_device = {
0132     .name       = "snappercl15-audio",
0133     .id     = -1,
0134 };
0135
0136 static void __init snappercl15_register_audio(void)
0137 {
0138     ep93xx_register_i2s();
0139     platform_device_register(&snappercl15_audio_device);
0140 }
0141
0142 static void __init snappercl15_init_machine(void)
0143 {
0144     ep93xx_init_devices();
0145     ep93xx_register_eth(&snappercl15_eth_data, 1);
0146     ep93xx_register_i2c(snappercl15_i2c_data,
0147                 ARRAY_SIZE(snappercl15_i2c_data));
0148     ep93xx_register_fb(&snappercl15_fb_info);
0149     snappercl15_register_audio();
0150     platform_device_register(&snappercl15_nand_device);
0151 }
0152
0153 MACHINE_START(SNAPPER_CL15, "Bluewater Systems Snapper CL15")
0154     /* Maintainer: Ryan Mallon */
0155     .atag_offset    = 0x100,
0156     .nr_irqs    = NR_EP93XX_IRQS,
0157     .map_io     = ep93xx_map_io,
0158     .init_irq   = ep93xx_init_irq,
0159     .init_time  = ep93xx_timer_init,
0160     .init_machine   = snappercl15_init_machine,
0161     .restart    = ep93xx_restart,
0162 MACHINE_END