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
42static 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
70static int snappercl15_nand_dev_ready(struct nand_chip *chip)
71{
72	return !!(__raw_readw(NAND_CTRL_ADDR(chip)) & SNAPPERCL15_NAND_RDY);
73}
74
75static 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
88static 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
101static 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
109static 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
117static struct ep93xx_eth_data __initdata snappercl15_eth_data = {
118	.phy_id			= 1,
119};
120
121static struct i2c_board_info __initdata snappercl15_i2c_data[] = {
122	{
123		/* Audio codec */
124		I2C_BOARD_INFO("tlv320aic23", 0x1a),
125	},
126};
127
128static struct ep93xxfb_mach_info __initdata snappercl15_fb_info = {
129};
130
131static struct platform_device snappercl15_audio_device = {
132	.name		= "snappercl15-audio",
133	.id		= -1,
134};
135
136static void __init snappercl15_register_audio(void)
137{
138	ep93xx_register_i2s();
139	platform_device_register(&snappercl15_audio_device);
140}
141
142static 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
153MACHINE_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,
162MACHINE_END
163