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
snappercl15_nand_cmd_ctrl(struct nand_chip * chip,int cmd,unsigned int ctrl)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
snappercl15_nand_dev_ready(struct nand_chip * chip)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
snappercl15_register_audio(void)136 static void __init snappercl15_register_audio(void)
137 {
138 ep93xx_register_i2s();
139 platform_device_register(&snappercl15_audio_device);
140 }
141
snappercl15_init_machine(void)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 .init_late = ep93xx_init_late,
161 .restart = ep93xx_restart,
162 MACHINE_END
163