4 * Copyright (C) 2009 Texas Instruments
5 * Vimal Singh <vimalsingh@ti.com>
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.
12 #include <linux/kernel.h>
13 #include <linux/platform_device.h>
15 #include <linux/mtd/nand.h>
16 #include <linux/platform_data/mtd-nand-omap2.h>
18 #include <asm/mach/flash.h>
20 #include <plat/gpmc.h>
24 static struct resource gpmc_nand_resource
[] = {
26 .flags
= IORESOURCE_MEM
,
29 .flags
= IORESOURCE_IRQ
,
32 .flags
= IORESOURCE_IRQ
,
36 static struct platform_device gpmc_nand_device
= {
39 .num_resources
= ARRAY_SIZE(gpmc_nand_resource
),
40 .resource
= gpmc_nand_resource
,
43 static int omap2_nand_gpmc_retime(struct omap_nand_platform_data
*gpmc_nand_data
)
45 struct gpmc_timings t
;
48 if (!gpmc_nand_data
->gpmc_t
)
51 memset(&t
, 0, sizeof(t
));
52 t
.sync_clk
= gpmc_nand_data
->gpmc_t
->sync_clk
;
53 t
.cs_on
= gpmc_round_ns_to_ticks(gpmc_nand_data
->gpmc_t
->cs_on
);
54 t
.adv_on
= gpmc_round_ns_to_ticks(gpmc_nand_data
->gpmc_t
->adv_on
);
57 t
.adv_rd_off
= gpmc_round_ns_to_ticks(
58 gpmc_nand_data
->gpmc_t
->adv_rd_off
);
60 t
.access
= gpmc_round_ns_to_ticks(gpmc_nand_data
->gpmc_t
->access
);
61 t
.oe_off
= gpmc_round_ns_to_ticks(gpmc_nand_data
->gpmc_t
->oe_off
);
62 t
.cs_rd_off
= gpmc_round_ns_to_ticks(gpmc_nand_data
->gpmc_t
->cs_rd_off
);
63 t
.rd_cycle
= gpmc_round_ns_to_ticks(gpmc_nand_data
->gpmc_t
->rd_cycle
);
66 t
.adv_wr_off
= gpmc_round_ns_to_ticks(
67 gpmc_nand_data
->gpmc_t
->adv_wr_off
);
69 if (cpu_is_omap34xx()) {
70 t
.wr_data_mux_bus
= gpmc_round_ns_to_ticks(
71 gpmc_nand_data
->gpmc_t
->wr_data_mux_bus
);
72 t
.wr_access
= gpmc_round_ns_to_ticks(
73 gpmc_nand_data
->gpmc_t
->wr_access
);
75 t
.we_off
= gpmc_round_ns_to_ticks(gpmc_nand_data
->gpmc_t
->we_off
);
76 t
.cs_wr_off
= gpmc_round_ns_to_ticks(gpmc_nand_data
->gpmc_t
->cs_wr_off
);
77 t
.wr_cycle
= gpmc_round_ns_to_ticks(gpmc_nand_data
->gpmc_t
->wr_cycle
);
80 if (gpmc_nand_data
->devsize
== NAND_BUSWIDTH_16
)
81 gpmc_cs_configure(gpmc_nand_data
->cs
, GPMC_CONFIG_DEV_SIZE
, 1);
83 gpmc_cs_configure(gpmc_nand_data
->cs
, GPMC_CONFIG_DEV_SIZE
, 0);
84 gpmc_cs_configure(gpmc_nand_data
->cs
,
85 GPMC_CONFIG_DEV_TYPE
, GPMC_DEVICETYPE_NAND
);
86 gpmc_cs_configure(gpmc_nand_data
->cs
, GPMC_CONFIG_WP
, 0);
87 err
= gpmc_cs_set_timings(gpmc_nand_data
->cs
, &t
);
94 int __init
gpmc_nand_init(struct omap_nand_platform_data
*gpmc_nand_data
)
97 struct device
*dev
= &gpmc_nand_device
.dev
;
99 gpmc_nand_device
.dev
.platform_data
= gpmc_nand_data
;
101 err
= gpmc_cs_request(gpmc_nand_data
->cs
, NAND_IO_SIZE
,
102 (unsigned long *)&gpmc_nand_resource
[0].start
);
104 dev_err(dev
, "Cannot request GPMC CS\n");
108 gpmc_nand_resource
[0].end
= gpmc_nand_resource
[0].start
+
111 gpmc_nand_resource
[1].start
=
112 gpmc_get_client_irq(GPMC_IRQ_FIFOEVENTENABLE
);
113 gpmc_nand_resource
[2].start
=
114 gpmc_get_client_irq(GPMC_IRQ_COUNT_EVENT
);
115 /* Set timings in GPMC */
116 err
= omap2_nand_gpmc_retime(gpmc_nand_data
);
118 dev_err(dev
, "Unable to set gpmc timings: %d\n", err
);
122 /* Enable RD PIN Monitoring Reg */
123 if (gpmc_nand_data
->dev_ready
) {
124 gpmc_cs_configure(gpmc_nand_data
->cs
, GPMC_CONFIG_RDY_BSY
, 1);
127 gpmc_update_nand_reg(&gpmc_nand_data
->reg
, gpmc_nand_data
->cs
);
129 err
= platform_device_register(&gpmc_nand_device
);
131 dev_err(dev
, "Unable to register NAND device\n");
138 gpmc_cs_free(gpmc_nand_data
->cs
);