mirror of https://gitee.com/openkylin/linux.git
123 lines
3.2 KiB
C
123 lines
3.2 KiB
C
/*
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* gpmc-nand.c
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*
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* Copyright (C) 2009 Texas Instruments
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* Vimal Singh <vimalsingh@ti.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/kernel.h>
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#include <linux/platform_device.h>
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#include <linux/io.h>
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#include <linux/mtd/nand.h>
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#include <asm/mach/flash.h>
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#include <plat/nand.h>
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#include <plat/board.h>
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#include <plat/gpmc.h>
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static struct resource gpmc_nand_resource = {
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.flags = IORESOURCE_MEM,
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};
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static struct platform_device gpmc_nand_device = {
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.name = "omap2-nand",
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.id = 0,
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.num_resources = 1,
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.resource = &gpmc_nand_resource,
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};
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static int omap2_nand_gpmc_retime(struct omap_nand_platform_data *gpmc_nand_data)
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{
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struct gpmc_timings t;
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int err;
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if (!gpmc_nand_data->gpmc_t)
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return 0;
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memset(&t, 0, sizeof(t));
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t.sync_clk = gpmc_nand_data->gpmc_t->sync_clk;
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t.cs_on = gpmc_round_ns_to_ticks(gpmc_nand_data->gpmc_t->cs_on);
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t.adv_on = gpmc_round_ns_to_ticks(gpmc_nand_data->gpmc_t->adv_on);
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/* Read */
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t.adv_rd_off = gpmc_round_ns_to_ticks(
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gpmc_nand_data->gpmc_t->adv_rd_off);
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t.oe_on = t.adv_on;
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t.access = gpmc_round_ns_to_ticks(gpmc_nand_data->gpmc_t->access);
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t.oe_off = gpmc_round_ns_to_ticks(gpmc_nand_data->gpmc_t->oe_off);
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t.cs_rd_off = gpmc_round_ns_to_ticks(gpmc_nand_data->gpmc_t->cs_rd_off);
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t.rd_cycle = gpmc_round_ns_to_ticks(gpmc_nand_data->gpmc_t->rd_cycle);
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/* Write */
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t.adv_wr_off = gpmc_round_ns_to_ticks(
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gpmc_nand_data->gpmc_t->adv_wr_off);
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t.we_on = t.oe_on;
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if (cpu_is_omap34xx()) {
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t.wr_data_mux_bus = gpmc_round_ns_to_ticks(
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gpmc_nand_data->gpmc_t->wr_data_mux_bus);
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t.wr_access = gpmc_round_ns_to_ticks(
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gpmc_nand_data->gpmc_t->wr_access);
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}
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t.we_off = gpmc_round_ns_to_ticks(gpmc_nand_data->gpmc_t->we_off);
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t.cs_wr_off = gpmc_round_ns_to_ticks(gpmc_nand_data->gpmc_t->cs_wr_off);
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t.wr_cycle = gpmc_round_ns_to_ticks(gpmc_nand_data->gpmc_t->wr_cycle);
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/* Configure GPMC */
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if (gpmc_nand_data->devsize == NAND_BUSWIDTH_16)
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gpmc_cs_configure(gpmc_nand_data->cs, GPMC_CONFIG_DEV_SIZE, 1);
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else
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gpmc_cs_configure(gpmc_nand_data->cs, GPMC_CONFIG_DEV_SIZE, 0);
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gpmc_cs_configure(gpmc_nand_data->cs,
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GPMC_CONFIG_DEV_TYPE, GPMC_DEVICETYPE_NAND);
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err = gpmc_cs_set_timings(gpmc_nand_data->cs, &t);
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if (err)
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return err;
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return 0;
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}
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int __init gpmc_nand_init(struct omap_nand_platform_data *gpmc_nand_data)
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{
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int err = 0;
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struct device *dev = &gpmc_nand_device.dev;
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gpmc_nand_device.dev.platform_data = gpmc_nand_data;
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err = gpmc_cs_request(gpmc_nand_data->cs, NAND_IO_SIZE,
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&gpmc_nand_data->phys_base);
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if (err < 0) {
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dev_err(dev, "Cannot request GPMC CS\n");
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return err;
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}
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/* Set timings in GPMC */
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err = omap2_nand_gpmc_retime(gpmc_nand_data);
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if (err < 0) {
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dev_err(dev, "Unable to set gpmc timings: %d\n", err);
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return err;
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}
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/* Enable RD PIN Monitoring Reg */
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if (gpmc_nand_data->dev_ready) {
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gpmc_cs_configure(gpmc_nand_data->cs, GPMC_CONFIG_RDY_BSY, 1);
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}
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err = platform_device_register(&gpmc_nand_device);
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if (err < 0) {
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dev_err(dev, "Unable to register NAND device\n");
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goto out_free_cs;
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}
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return 0;
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out_free_cs:
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gpmc_cs_free(gpmc_nand_data->cs);
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return err;
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}
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