af8184718a
This patch makes the SMC configuration take timings in clock cycles instead of nanoseconds. A function to calculate timings in clock cycles is added. This patch removes the rounding troubles of the previous SMC configuration method. [hskinnemoen@atmel.com: fix atstk1002/atngw100 flash config] Signed-off-by: Kristoffer Nyborg Gregertsen <gregerts@stud.ntnu.no> Signed-off-by: Haavard Skinnemoen <hskinnemoen@atmel.com>
98 lines
2.1 KiB
C
98 lines
2.1 KiB
C
/*
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* ATSTK1000 board-specific flash initialization
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*
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* Copyright (C) 2005-2006 Atmel Corporation
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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/init.h>
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#include <linux/platform_device.h>
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#include <linux/mtd/mtd.h>
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#include <linux/mtd/partitions.h>
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#include <linux/mtd/physmap.h>
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#include <asm/arch/smc.h>
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static struct smc_timing flash_timing __initdata = {
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.ncs_read_setup = 0,
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.nrd_setup = 40,
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.ncs_write_setup = 0,
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.nwe_setup = 10,
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.ncs_read_pulse = 80,
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.nrd_pulse = 40,
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.ncs_write_pulse = 65,
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.nwe_pulse = 55,
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.read_cycle = 120,
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.write_cycle = 120,
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};
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static struct smc_config flash_config __initdata = {
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.bus_width = 2,
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.nrd_controlled = 1,
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.nwe_controlled = 1,
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.byte_write = 1,
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};
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static struct mtd_partition flash_parts[] = {
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{
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.name = "u-boot",
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.offset = 0x00000000,
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.size = 0x00020000, /* 128 KiB */
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.mask_flags = MTD_WRITEABLE,
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},
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{
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.name = "root",
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.offset = 0x00020000,
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.size = 0x007d0000,
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},
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{
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.name = "env",
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.offset = 0x007f0000,
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.size = 0x00010000,
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.mask_flags = MTD_WRITEABLE,
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},
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};
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static struct physmap_flash_data flash_data = {
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.width = 2,
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.nr_parts = ARRAY_SIZE(flash_parts),
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.parts = flash_parts,
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};
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static struct resource flash_resource = {
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.start = 0x00000000,
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.end = 0x007fffff,
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.flags = IORESOURCE_MEM,
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};
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static struct platform_device flash_device = {
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.name = "physmap-flash",
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.id = 0,
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.resource = &flash_resource,
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.num_resources = 1,
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.dev = {
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.platform_data = &flash_data,
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},
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};
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/* This needs to be called after the SMC has been initialized */
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static int __init atstk1000_flash_init(void)
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{
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int ret;
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smc_set_timing(&flash_config, &flash_timing);
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ret = smc_set_configuration(0, &flash_config);
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if (ret < 0) {
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printk(KERN_ERR "atstk1000: failed to set NOR flash timing\n");
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return ret;
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}
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platform_device_register(&flash_device);
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return 0;
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}
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device_initcall(atstk1000_flash_init);
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