1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
|
/*
* gpmc-nand.c
*
* Copyright (C) 2009 Texas Instruments
* Vimal Singh <vimalsingh@ti.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include <linux/kernel.h>
#include <linux/platform_device.h>
#include <linux/io.h>
#include <asm/mach/flash.h>
#include <plat/nand.h>
#include <plat/board.h>
#include <plat/gpmc.h>
#define WR_RD_PIN_MONITORING 0x00600000
static struct omap_nand_platform_data *gpmc_nand_data;
static struct resource gpmc_nand_resource = {
.flags = IORESOURCE_MEM,
};
static struct platform_device gpmc_nand_device = {
.name = "omap2-nand",
.id = 0,
.num_resources = 1,
.resource = &gpmc_nand_resource,
};
static int omap2_nand_gpmc_retime(void)
{
struct gpmc_timings t;
int err;
memset(&t, 0, sizeof(t));
t.sync_clk = gpmc_round_ns_to_ticks(gpmc_nand_data->gpmc_t->sync_clk);
t.cs_on = gpmc_round_ns_to_ticks(gpmc_nand_data->gpmc_t->cs_on);
t.adv_on = gpmc_round_ns_to_ticks(gpmc_nand_data->gpmc_t->adv_on);
/* Read */
t.adv_rd_off = gpmc_round_ns_to_ticks(
gpmc_nand_data->gpmc_t->adv_rd_off);
t.oe_on = t.adv_on;
t.access = gpmc_round_ns_to_ticks(gpmc_nand_data->gpmc_t->access);
t.oe_off = gpmc_round_ns_to_ticks(gpmc_nand_data->gpmc_t->oe_off);
t.cs_rd_off = gpmc_round_ns_to_ticks(gpmc_nand_data->gpmc_t->cs_rd_off);
t.rd_cycle = gpmc_round_ns_to_ticks(gpmc_nand_data->gpmc_t->rd_cycle);
/* Write */
t.adv_wr_off = gpmc_round_ns_to_ticks(
gpmc_nand_data->gpmc_t->adv_wr_off);
t.we_on = t.oe_on;
if (cpu_is_omap34xx()) {
t.wr_data_mux_bus = gpmc_round_ns_to_ticks(
gpmc_nand_data->gpmc_t->wr_data_mux_bus);
t.wr_access = gpmc_round_ns_to_ticks(
gpmc_nand_data->gpmc_t->wr_access);
}
t.we_off = gpmc_round_ns_to_ticks(gpmc_nand_data->gpmc_t->we_off);
t.cs_wr_off = gpmc_round_ns_to_ticks(gpmc_nand_data->gpmc_t->cs_wr_off);
t.wr_cycle = gpmc_round_ns_to_ticks(gpmc_nand_data->gpmc_t->wr_cycle);
/* Configure GPMC */
gpmc_cs_write_reg(gpmc_nand_data->cs, GPMC_CS_CONFIG1,
GPMC_CONFIG1_DEVICESIZE(gpmc_nand_data->devsize) |
GPMC_CONFIG1_DEVICETYPE_NAND);
err = gpmc_cs_set_timings(gpmc_nand_data->cs, &t);
if (err)
return err;
return 0;
}
static int gpmc_nand_setup(void)
{
struct device *dev = &gpmc_nand_device.dev;
/* Set timings in GPMC */
if (omap2_nand_gpmc_retime() < 0) {
dev_err(dev, "Unable to set gpmc timings\n");
return -EINVAL;
}
return 0;
}
int __init gpmc_nand_init(struct omap_nand_platform_data *_nand_data)
{
unsigned int val;
int err = 0;
struct device *dev = &gpmc_nand_device.dev;
gpmc_nand_data = _nand_data;
gpmc_nand_data->nand_setup = gpmc_nand_setup;
gpmc_nand_device.dev.platform_data = gpmc_nand_data;
err = gpmc_cs_request(gpmc_nand_data->cs, NAND_IO_SIZE,
&gpmc_nand_data->phys_base);
if (err < 0) {
dev_err(dev, "Cannot request GPMC CS\n");
return err;
}
err = gpmc_nand_setup();
if (err < 0) {
dev_err(dev, "NAND platform setup failed: %d\n", err);
return err;
}
/* Enable RD PIN Monitoring Reg */
if (gpmc_nand_data->dev_ready) {
val = gpmc_cs_read_reg(gpmc_nand_data->cs,
GPMC_CS_CONFIG1);
val |= WR_RD_PIN_MONITORING;
gpmc_cs_write_reg(gpmc_nand_data->cs,
GPMC_CS_CONFIG1, val);
}
err = platform_device_register(&gpmc_nand_device);
if (err < 0) {
dev_err(dev, "Unable to register NAND device\n");
goto out_free_cs;
}
return 0;
out_free_cs:
gpmc_cs_free(gpmc_nand_data->cs);
return err;
}
|
