1 /*
2 * gpmc-nand.c
3 *
4 * Copyright (C) 2009 Texas Instruments
5 * Vimal Singh <vimalsingh@ti.com>
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
10 */
11
12 #include <linux/kernel.h>
13 #include <linux/platform_device.h>
14 #include <linux/io.h>
15 #include <linux/mtd/nand.h>
16
17 #include <asm/mach/flash.h>
18
19 #include <plat/nand.h>
20 #include <plat/board.h>
21 #include <plat/gpmc.h>
22
23 static struct resource gpmc_nand_resource = {
24 .flags = IORESOURCE_MEM,
25 };
26
27 static struct platform_device gpmc_nand_device = {
28 .name = "omap2-nand",
29 .id = 0,
30 .num_resources = 1,
31 .resource = &gpmc_nand_resource,
32 };
33
omap2_nand_gpmc_retime(struct omap_nand_platform_data * gpmc_nand_data)34 static int omap2_nand_gpmc_retime(struct omap_nand_platform_data *gpmc_nand_data)
35 {
36 struct gpmc_timings t;
37 int err;
38
39 if (!gpmc_nand_data->gpmc_t)
40 return 0;
41
42 memset(&t, 0, sizeof(t));
43 t.sync_clk = gpmc_nand_data->gpmc_t->sync_clk;
44 t.cs_on = gpmc_round_ns_to_ticks(gpmc_nand_data->gpmc_t->cs_on);
45 t.adv_on = gpmc_round_ns_to_ticks(gpmc_nand_data->gpmc_t->adv_on);
46
47 /* Read */
48 t.adv_rd_off = gpmc_round_ns_to_ticks(
49 gpmc_nand_data->gpmc_t->adv_rd_off);
50 t.oe_on = t.adv_on;
51 t.access = gpmc_round_ns_to_ticks(gpmc_nand_data->gpmc_t->access);
52 t.oe_off = gpmc_round_ns_to_ticks(gpmc_nand_data->gpmc_t->oe_off);
53 t.cs_rd_off = gpmc_round_ns_to_ticks(gpmc_nand_data->gpmc_t->cs_rd_off);
54 t.rd_cycle = gpmc_round_ns_to_ticks(gpmc_nand_data->gpmc_t->rd_cycle);
55
56 /* Write */
57 t.adv_wr_off = gpmc_round_ns_to_ticks(
58 gpmc_nand_data->gpmc_t->adv_wr_off);
59 t.we_on = t.oe_on;
60 if (cpu_is_omap34xx()) {
61 t.wr_data_mux_bus = gpmc_round_ns_to_ticks(
62 gpmc_nand_data->gpmc_t->wr_data_mux_bus);
63 t.wr_access = gpmc_round_ns_to_ticks(
64 gpmc_nand_data->gpmc_t->wr_access);
65 }
66 t.we_off = gpmc_round_ns_to_ticks(gpmc_nand_data->gpmc_t->we_off);
67 t.cs_wr_off = gpmc_round_ns_to_ticks(gpmc_nand_data->gpmc_t->cs_wr_off);
68 t.wr_cycle = gpmc_round_ns_to_ticks(gpmc_nand_data->gpmc_t->wr_cycle);
69
70 /* Configure GPMC */
71 if (gpmc_nand_data->devsize == NAND_BUSWIDTH_16)
72 gpmc_cs_configure(gpmc_nand_data->cs, GPMC_CONFIG_DEV_SIZE, 1);
73 else
74 gpmc_cs_configure(gpmc_nand_data->cs, GPMC_CONFIG_DEV_SIZE, 0);
75 gpmc_cs_configure(gpmc_nand_data->cs,
76 GPMC_CONFIG_DEV_TYPE, GPMC_DEVICETYPE_NAND);
77 err = gpmc_cs_set_timings(gpmc_nand_data->cs, &t);
78 if (err)
79 return err;
80
81 return 0;
82 }
83
gpmc_nand_init(struct omap_nand_platform_data * gpmc_nand_data)84 int __init gpmc_nand_init(struct omap_nand_platform_data *gpmc_nand_data)
85 {
86 int err = 0;
87 struct device *dev = &gpmc_nand_device.dev;
88
89 gpmc_nand_device.dev.platform_data = gpmc_nand_data;
90
91 err = gpmc_cs_request(gpmc_nand_data->cs, NAND_IO_SIZE,
92 &gpmc_nand_data->phys_base);
93 if (err < 0) {
94 dev_err(dev, "Cannot request GPMC CS\n");
95 return err;
96 }
97
98 /* Set timings in GPMC */
99 err = omap2_nand_gpmc_retime(gpmc_nand_data);
100 if (err < 0) {
101 dev_err(dev, "Unable to set gpmc timings: %d\n", err);
102 return err;
103 }
104
105 /* Enable RD PIN Monitoring Reg */
106 if (gpmc_nand_data->dev_ready) {
107 gpmc_cs_configure(gpmc_nand_data->cs, GPMC_CONFIG_RDY_BSY, 1);
108 }
109
110 err = platform_device_register(&gpmc_nand_device);
111 if (err < 0) {
112 dev_err(dev, "Unable to register NAND device\n");
113 goto out_free_cs;
114 }
115
116 return 0;
117
118 out_free_cs:
119 gpmc_cs_free(gpmc_nand_data->cs);
120
121 return err;
122 }
123