arch/arm/mach-omap2/gpmc-onenand.c - LeafOS-Devices/android_kernel_samsung_gta4xl - Gitiles

 /*
  * linux/arch/arm/mach-omap2/gpmc-onenand.c
  *
  * Copyright (C) 2006 - 2009 Nokia Corporation
  * Contacts:	Juha Yrjola
  *		Tony Lindgren
  *
  * 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/string.h>
 #include <linux/kernel.h>
 #include <linux/platform_device.h>
 #include <linux/mtd/onenand_regs.h>
 #include <linux/io.h>

 #include <asm/mach/flash.h>

 #include <plat/cpu.h>
 #include <plat/onenand.h>
 #include <plat/board.h>
 #include <plat/gpmc.h>

 static struct omap_onenand_platform_data *gpmc_onenand_data;

 static struct platform_device gpmc_onenand_device = {
 	.name		= "omap2-onenand",
 	.id		= -1,
 };

 static int omap2_onenand_set_async_mode(int cs, void __iomem *onenand_base)
 {
 	struct gpmc_timings t;
 	u32 reg;
 	int err;

 	const int t_cer = 15;
 	const int t_avdp = 12;
 	const int t_aavdh = 7;
 	const int t_ce = 76;
 	const int t_aa = 76;
 	const int t_oe = 20;
 	const int t_cez = 20; /* max of t_cez, t_oez */
 	const int t_ds = 30;
 	const int t_wpl = 40;
 	const int t_wph = 30;

 	/* Ensure sync read and sync write are disabled */
 	reg = readw(onenand_base + ONENAND_REG_SYS_CFG1);
 	reg &= ~ONENAND_SYS_CFG1_SYNC_READ & ~ONENAND_SYS_CFG1_SYNC_WRITE;
 	writew(reg, onenand_base + ONENAND_REG_SYS_CFG1);

 	memset(&t, 0, sizeof(t));
 	t.sync_clk = 0;
 	t.cs_on = 0;
 	t.adv_on = 0;

 	/* Read */
 	t.adv_rd_off = gpmc_round_ns_to_ticks(max_t(int, t_avdp, t_cer));
 	t.oe_on  = t.adv_rd_off + gpmc_round_ns_to_ticks(t_aavdh);
 	t.access = t.adv_on + gpmc_round_ns_to_ticks(t_aa);
 	t.access = max_t(int, t.access, t.cs_on + gpmc_round_ns_to_ticks(t_ce));
 	t.access = max_t(int, t.access, t.oe_on + gpmc_round_ns_to_ticks(t_oe));
 	t.oe_off = t.access + gpmc_round_ns_to_ticks(1);
 	t.cs_rd_off = t.oe_off;
 	t.rd_cycle  = t.cs_rd_off + gpmc_round_ns_to_ticks(t_cez);

 	/* Write */
 	t.adv_wr_off = t.adv_rd_off;
 	t.we_on  = t.oe_on;
 	if (cpu_is_omap34xx()) {
 		t.wr_data_mux_bus = t.we_on;
 		t.wr_access = t.we_on + gpmc_round_ns_to_ticks(t_ds);
 	}
 	t.we_off = t.we_on + gpmc_round_ns_to_ticks(t_wpl);
 	t.cs_wr_off = t.we_off + gpmc_round_ns_to_ticks(t_wph);
 	t.wr_cycle  = t.cs_wr_off + gpmc_round_ns_to_ticks(t_cez);

 	/* Configure GPMC for asynchronous read */
 	gpmc_cs_write_reg(cs, GPMC_CS_CONFIG1,
 			  GPMC_CONFIG1_DEVICESIZE_16 |
 			  GPMC_CONFIG1_MUXADDDATA);

 	err = gpmc_cs_set_timings(cs, &t);
 	if (err)
 		return err;

 	/* Ensure sync read and sync write are disabled */
 	reg = readw(onenand_base + ONENAND_REG_SYS_CFG1);
 	reg &= ~ONENAND_SYS_CFG1_SYNC_READ & ~ONENAND_SYS_CFG1_SYNC_WRITE;
 	writew(reg, onenand_base + ONENAND_REG_SYS_CFG1);

 	return 0;
 }

 static void set_onenand_cfg(void __iomem *onenand_base, int latency,
 				int sync_read, int sync_write, int hf, int vhf)
 {
 	u32 reg;

 	reg = readw(onenand_base + ONENAND_REG_SYS_CFG1);
 	reg &= ~((0x7 << ONENAND_SYS_CFG1_BRL_SHIFT) | (0x7 << 9));
 	reg |=	(latency << ONENAND_SYS_CFG1_BRL_SHIFT) |
 		ONENAND_SYS_CFG1_BL_16;
 	if (sync_read)
 		reg |= ONENAND_SYS_CFG1_SYNC_READ;
 	else
 		reg &= ~ONENAND_SYS_CFG1_SYNC_READ;
 	if (sync_write)
 		reg |= ONENAND_SYS_CFG1_SYNC_WRITE;
 	else
 		reg &= ~ONENAND_SYS_CFG1_SYNC_WRITE;
 	if (hf)
 		reg |= ONENAND_SYS_CFG1_HF;
 	else
 		reg &= ~ONENAND_SYS_CFG1_HF;
 	if (vhf)
 		reg |= ONENAND_SYS_CFG1_VHF;
 	else
 		reg &= ~ONENAND_SYS_CFG1_VHF;
 	writew(reg, onenand_base + ONENAND_REG_SYS_CFG1);
 }

 static int omap2_onenand_get_freq(struct omap_onenand_platform_data *cfg,
 				  void __iomem *onenand_base, bool *clk_dep)
 {
 	u16 ver = readw(onenand_base + ONENAND_REG_VERSION_ID);
 	int freq = 0;

 	if (cfg->get_freq) {
 		struct onenand_freq_info fi;

 		fi.maf_id = readw(onenand_base + ONENAND_REG_MANUFACTURER_ID);
 		fi.dev_id = readw(onenand_base + ONENAND_REG_DEVICE_ID);
 		fi.ver_id = ver;
 		freq = cfg->get_freq(&fi, clk_dep);
 		if (freq)
 			return freq;
 	}

 	switch ((ver >> 4) & 0xf) {
 	case 0:
 		freq = 40;
 		break;
 	case 1:
 		freq = 54;
 		break;
 	case 2:
 		freq = 66;
 		break;
 	case 3:
 		freq = 83;
 		break;
 	case 4:
 		freq = 104;
 		break;
 	default:
 		freq = 54;
 		break;
 	}

 	return freq;
 }

 static int omap2_onenand_set_sync_mode(struct omap_onenand_platform_data *cfg,
 					void __iomem *onenand_base,
 					int *freq_ptr)
 {
 	struct gpmc_timings t;
 	const int t_cer  = 15;
 	const int t_avdp = 12;
 	const int t_cez  = 20; /* max of t_cez, t_oez */
 	const int t_ds   = 30;
 	const int t_wpl  = 40;
 	const int t_wph  = 30;
 	int min_gpmc_clk_period, t_ces, t_avds, t_avdh, t_ach, t_aavdh, t_rdyo;
 	int div, fclk_offset_ns, fclk_offset, gpmc_clk_ns, latency;
 	int first_time = 0, hf = 0, vhf = 0, sync_read = 0, sync_write = 0;
 	int err, ticks_cez;
 	int cs = cfg->cs, freq = *freq_ptr;
 	u32 reg;
 	bool clk_dep = false;

 	if (cfg->flags & ONENAND_SYNC_READ) {
 		sync_read = 1;
 	} else if (cfg->flags & ONENAND_SYNC_READWRITE) {
 		sync_read = 1;
 		sync_write = 1;
 	} else
 		return omap2_onenand_set_async_mode(cs, onenand_base);

 	if (!freq) {
 		/* Very first call freq is not known */
 		err = omap2_onenand_set_async_mode(cs, onenand_base);
 		if (err)
 			return err;
 		freq = omap2_onenand_get_freq(cfg, onenand_base, &clk_dep);
 		first_time = 1;
 	}

 	switch (freq) {
 	case 104:
 		min_gpmc_clk_period = 9600; /* 104 MHz */
 		t_ces   = 3;
 		t_avds  = 4;
 		t_avdh  = 2;
 		t_ach   = 3;
 		t_aavdh = 6;
 		t_rdyo  = 6;
 		break;
 	case 83:
 		min_gpmc_clk_period = 12000; /* 83 MHz */
 		t_ces   = 5;
 		t_avds  = 4;
 		t_avdh  = 2;
 		t_ach   = 6;
 		t_aavdh = 6;
 		t_rdyo  = 9;
 		break;
 	case 66:
 		min_gpmc_clk_period = 15000; /* 66 MHz */
 		t_ces   = 6;
 		t_avds  = 5;
 		t_avdh  = 2;
 		t_ach   = 6;
 		t_aavdh = 6;
 		t_rdyo  = 11;
 		break;
 	default:
 		min_gpmc_clk_period = 18500; /* 54 MHz */
 		t_ces   = 7;
 		t_avds  = 7;
 		t_avdh  = 7;
 		t_ach   = 9;
 		t_aavdh = 7;
 		t_rdyo  = 15;
 		sync_write = 0;
 		break;
 	}

 	div = gpmc_cs_calc_divider(cs, min_gpmc_clk_period);
 	gpmc_clk_ns = gpmc_ticks_to_ns(div);
 	if (gpmc_clk_ns < 15) /* >66Mhz */
 		hf = 1;
 	if (gpmc_clk_ns < 12) /* >83Mhz */
 		vhf = 1;
 	if (vhf)
 		latency = 8;
 	else if (hf)
 		latency = 6;
 	else if (gpmc_clk_ns >= 25) /* 40 MHz*/
 		latency = 3;
 	else
 		latency = 4;

 	if (clk_dep) {
 		if (gpmc_clk_ns < 12) { /* >83Mhz */
 			t_ces   = 3;
 			t_avds  = 4;
 		} else if (gpmc_clk_ns < 15) { /* >66Mhz */
 			t_ces   = 5;
 			t_avds  = 4;
 		} else if (gpmc_clk_ns < 25) { /* >40Mhz */
 			t_ces   = 6;
 			t_avds  = 5;
 		} else {
 			t_ces   = 7;
 			t_avds  = 7;
 		}
 	}

 	if (first_time)
 		set_onenand_cfg(onenand_base, latency,
 					sync_read, sync_write, hf, vhf);

 	if (div == 1) {
 		reg = gpmc_cs_read_reg(cs, GPMC_CS_CONFIG2);
 		reg |= (1 << 7);
 		gpmc_cs_write_reg(cs, GPMC_CS_CONFIG2, reg);
 		reg = gpmc_cs_read_reg(cs, GPMC_CS_CONFIG3);
 		reg |= (1 << 7);
 		gpmc_cs_write_reg(cs, GPMC_CS_CONFIG3, reg);
 		reg = gpmc_cs_read_reg(cs, GPMC_CS_CONFIG4);
 		reg |= (1 << 7);
 		reg |= (1 << 23);
 		gpmc_cs_write_reg(cs, GPMC_CS_CONFIG4, reg);
 	} else {
 		reg = gpmc_cs_read_reg(cs, GPMC_CS_CONFIG2);
 		reg &= ~(1 << 7);
 		gpmc_cs_write_reg(cs, GPMC_CS_CONFIG2, reg);
 		reg = gpmc_cs_read_reg(cs, GPMC_CS_CONFIG3);
 		reg &= ~(1 << 7);
 		gpmc_cs_write_reg(cs, GPMC_CS_CONFIG3, reg);
 		reg = gpmc_cs_read_reg(cs, GPMC_CS_CONFIG4);
 		reg &= ~(1 << 7);
 		reg &= ~(1 << 23);
 		gpmc_cs_write_reg(cs, GPMC_CS_CONFIG4, reg);
 	}

 	/* Set synchronous read timings */
 	memset(&t, 0, sizeof(t));
 	t.sync_clk = min_gpmc_clk_period;
 	t.cs_on = 0;
 	t.adv_on = 0;
 	fclk_offset_ns = gpmc_round_ns_to_ticks(max_t(int, t_ces, t_avds));
 	fclk_offset = gpmc_ns_to_ticks(fclk_offset_ns);
 	t.page_burst_access = gpmc_clk_ns;

 	/* Read */
 	t.adv_rd_off = gpmc_ticks_to_ns(fclk_offset + gpmc_ns_to_ticks(t_avdh));
 	t.oe_on = gpmc_ticks_to_ns(fclk_offset + gpmc_ns_to_ticks(t_ach));
 	/* Force at least 1 clk between AVD High to OE Low */
 	if (t.oe_on <= t.adv_rd_off)
 		t.oe_on = t.adv_rd_off + gpmc_round_ns_to_ticks(1);
 	t.access = gpmc_ticks_to_ns(fclk_offset + (latency + 1) * div);
 	t.oe_off = t.access + gpmc_round_ns_to_ticks(1);
 	t.cs_rd_off = t.oe_off;
 	ticks_cez = ((gpmc_ns_to_ticks(t_cez) + div - 1) / div) * div;
 	t.rd_cycle = gpmc_ticks_to_ns(fclk_offset + (latency + 1) * div +
 		     ticks_cez);

 	/* Write */
 	if (sync_write) {
 		t.adv_wr_off = t.adv_rd_off;
 		t.we_on  = 0;
 		t.we_off = t.cs_rd_off;
 		t.cs_wr_off = t.cs_rd_off;
 		t.wr_cycle  = t.rd_cycle;
 		if (cpu_is_omap34xx()) {
 			t.wr_data_mux_bus = gpmc_ticks_to_ns(fclk_offset +
 					gpmc_ps_to_ticks(min_gpmc_clk_period +
 					t_rdyo * 1000));
 			t.wr_access = t.access;
 		}
 	} else {
 		t.adv_wr_off = gpmc_round_ns_to_ticks(max_t(int,
 							t_avdp, t_cer));
 		t.we_on  = t.adv_wr_off + gpmc_round_ns_to_ticks(t_aavdh);
 		t.we_off = t.we_on + gpmc_round_ns_to_ticks(t_wpl);
 		t.cs_wr_off = t.we_off + gpmc_round_ns_to_ticks(t_wph);
 		t.wr_cycle  = t.cs_wr_off + gpmc_round_ns_to_ticks(t_cez);
 		if (cpu_is_omap34xx()) {
 			t.wr_data_mux_bus = t.we_on;
 			t.wr_access = t.we_on + gpmc_round_ns_to_ticks(t_ds);
 		}
 	}

 	/* Configure GPMC for synchronous read */
 	gpmc_cs_write_reg(cs, GPMC_CS_CONFIG1,
 			  GPMC_CONFIG1_WRAPBURST_SUPP |
 			  GPMC_CONFIG1_READMULTIPLE_SUPP |
 			  (sync_read ? GPMC_CONFIG1_READTYPE_SYNC : 0) |
 			  (sync_write ? GPMC_CONFIG1_WRITEMULTIPLE_SUPP : 0) |
 			  (sync_write ? GPMC_CONFIG1_WRITETYPE_SYNC : 0) |
 			  GPMC_CONFIG1_CLKACTIVATIONTIME(fclk_offset) |
 			  GPMC_CONFIG1_PAGE_LEN(2) |
 			  (cpu_is_omap34xx() ? 0 :
 				(GPMC_CONFIG1_WAIT_READ_MON |
 				 GPMC_CONFIG1_WAIT_PIN_SEL(0))) |
 			  GPMC_CONFIG1_DEVICESIZE_16 |
 			  GPMC_CONFIG1_DEVICETYPE_NOR |
 			  GPMC_CONFIG1_MUXADDDATA);

 	err = gpmc_cs_set_timings(cs, &t);
 	if (err)
 		return err;

 	set_onenand_cfg(onenand_base, latency, sync_read, sync_write, hf, vhf);

 	*freq_ptr = freq;

 	return 0;
 }

 static int gpmc_onenand_setup(void __iomem *onenand_base, int *freq_ptr)
 {
 	struct device *dev = &gpmc_onenand_device.dev;

 	/* Set sync timings in GPMC */
 	if (omap2_onenand_set_sync_mode(gpmc_onenand_data, onenand_base,
 			freq_ptr) < 0) {
 		dev_err(dev, "Unable to set synchronous mode\n");
 		return -EINVAL;
 	}

 	return 0;
 }

 void __init gpmc_onenand_init(struct omap_onenand_platform_data *_onenand_data)
 {
 	gpmc_onenand_data = _onenand_data;
 	gpmc_onenand_data->onenand_setup = gpmc_onenand_setup;
 	gpmc_onenand_device.dev.platform_data = gpmc_onenand_data;

 	if (cpu_is_omap24xx() &&
 			(gpmc_onenand_data->flags & ONENAND_SYNC_READWRITE)) {
 		printk(KERN_ERR "Onenand using only SYNC_READ on 24xx\n");
 		gpmc_onenand_data->flags &= ~ONENAND_SYNC_READWRITE;
 		gpmc_onenand_data->flags |= ONENAND_SYNC_READ;
 	}

 	if (platform_device_register(&gpmc_onenand_device) < 0) {
 		printk(KERN_ERR "Unable to register OneNAND device\n");
 		return;
 	}
 }
	/*
	* linux/arch/arm/mach-omap2/gpmc-onenand.c
	*
	* Copyright (C) 2006 - 2009 Nokia Corporation
	* Contacts: Juha Yrjola
	* Tony Lindgren
	*
	* 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/string.h>
	#include <linux/kernel.h>
	#include <linux/platform_device.h>
	#include <linux/mtd/onenand_regs.h>
	#include <linux/io.h>

	#include <asm/mach/flash.h>

	#include <plat/cpu.h>
	#include <plat/onenand.h>
	#include <plat/board.h>
	#include <plat/gpmc.h>

	static struct omap_onenand_platform_data *gpmc_onenand_data;

	static struct platform_device gpmc_onenand_device = {
	.name = "omap2-onenand",
	.id = -1,
	};

	static int omap2_onenand_set_async_mode(int cs, void __iomem *onenand_base)
	{
	struct gpmc_timings t;
	u32 reg;
	int err;

	const int t_cer = 15;
	const int t_avdp = 12;
	const int t_aavdh = 7;
	const int t_ce = 76;
	const int t_aa = 76;
	const int t_oe = 20;
	const int t_cez = 20; /* max of t_cez, t_oez */
	const int t_ds = 30;
	const int t_wpl = 40;
	const int t_wph = 30;

	/* Ensure sync read and sync write are disabled */
	reg = readw(onenand_base + ONENAND_REG_SYS_CFG1);
	reg &= ~ONENAND_SYS_CFG1_SYNC_READ & ~ONENAND_SYS_CFG1_SYNC_WRITE;
	writew(reg, onenand_base + ONENAND_REG_SYS_CFG1);

	memset(&t, 0, sizeof(t));
	t.sync_clk = 0;
	t.cs_on = 0;
	t.adv_on = 0;

	/* Read */
	t.adv_rd_off = gpmc_round_ns_to_ticks(max_t(int, t_avdp, t_cer));
	t.oe_on = t.adv_rd_off + gpmc_round_ns_to_ticks(t_aavdh);
	t.access = t.adv_on + gpmc_round_ns_to_ticks(t_aa);
	t.access = max_t(int, t.access, t.cs_on + gpmc_round_ns_to_ticks(t_ce));
	t.access = max_t(int, t.access, t.oe_on + gpmc_round_ns_to_ticks(t_oe));
	t.oe_off = t.access + gpmc_round_ns_to_ticks(1);
	t.cs_rd_off = t.oe_off;
	t.rd_cycle = t.cs_rd_off + gpmc_round_ns_to_ticks(t_cez);

	/* Write */
	t.adv_wr_off = t.adv_rd_off;
	t.we_on = t.oe_on;
	if (cpu_is_omap34xx()) {
	t.wr_data_mux_bus = t.we_on;
	t.wr_access = t.we_on + gpmc_round_ns_to_ticks(t_ds);
	}
	t.we_off = t.we_on + gpmc_round_ns_to_ticks(t_wpl);
	t.cs_wr_off = t.we_off + gpmc_round_ns_to_ticks(t_wph);
	t.wr_cycle = t.cs_wr_off + gpmc_round_ns_to_ticks(t_cez);

	/* Configure GPMC for asynchronous read */
	gpmc_cs_write_reg(cs, GPMC_CS_CONFIG1,
	GPMC_CONFIG1_DEVICESIZE_16 \|
	GPMC_CONFIG1_MUXADDDATA);

	err = gpmc_cs_set_timings(cs, &t);
	if (err)
	return err;

	/* Ensure sync read and sync write are disabled */
	reg = readw(onenand_base + ONENAND_REG_SYS_CFG1);
	reg &= ~ONENAND_SYS_CFG1_SYNC_READ & ~ONENAND_SYS_CFG1_SYNC_WRITE;
	writew(reg, onenand_base + ONENAND_REG_SYS_CFG1);

	return 0;
	}

	static void set_onenand_cfg(void __iomem *onenand_base, int latency,
	int sync_read, int sync_write, int hf, int vhf)
	{
	u32 reg;

	reg = readw(onenand_base + ONENAND_REG_SYS_CFG1);
	reg &= ~((0x7 << ONENAND_SYS_CFG1_BRL_SHIFT) \| (0x7 << 9));
	reg \|= (latency << ONENAND_SYS_CFG1_BRL_SHIFT) \|
	ONENAND_SYS_CFG1_BL_16;
	if (sync_read)
	reg \|= ONENAND_SYS_CFG1_SYNC_READ;
	else
	reg &= ~ONENAND_SYS_CFG1_SYNC_READ;
	if (sync_write)
	reg \|= ONENAND_SYS_CFG1_SYNC_WRITE;
	else
	reg &= ~ONENAND_SYS_CFG1_SYNC_WRITE;
	if (hf)
	reg \|= ONENAND_SYS_CFG1_HF;
	else
	reg &= ~ONENAND_SYS_CFG1_HF;
	if (vhf)
	reg \|= ONENAND_SYS_CFG1_VHF;
	else
	reg &= ~ONENAND_SYS_CFG1_VHF;
	writew(reg, onenand_base + ONENAND_REG_SYS_CFG1);
	}

	static int omap2_onenand_get_freq(struct omap_onenand_platform_data *cfg,
	void __iomem onenand_base, bool clk_dep)
	{
	u16 ver = readw(onenand_base + ONENAND_REG_VERSION_ID);
	int freq = 0;

	if (cfg->get_freq) {
	struct onenand_freq_info fi;

	fi.maf_id = readw(onenand_base + ONENAND_REG_MANUFACTURER_ID);
	fi.dev_id = readw(onenand_base + ONENAND_REG_DEVICE_ID);
	fi.ver_id = ver;
	freq = cfg->get_freq(&fi, clk_dep);
	if (freq)
	return freq;
	}

	switch ((ver >> 4) & 0xf) {
	case 0:
	freq = 40;
	break;
	case 1:
	freq = 54;
	break;
	case 2:
	freq = 66;
	break;
	case 3:
	freq = 83;
	break;
	case 4:
	freq = 104;
	break;
	default:
	freq = 54;
	break;
	}

	return freq;
	}

	static int omap2_onenand_set_sync_mode(struct omap_onenand_platform_data *cfg,
	void __iomem *onenand_base,
	int *freq_ptr)
	{
	struct gpmc_timings t;
	const int t_cer = 15;
	const int t_avdp = 12;
	const int t_cez = 20; /* max of t_cez, t_oez */
	const int t_ds = 30;
	const int t_wpl = 40;
	const int t_wph = 30;
	int min_gpmc_clk_period, t_ces, t_avds, t_avdh, t_ach, t_aavdh, t_rdyo;
	int div, fclk_offset_ns, fclk_offset, gpmc_clk_ns, latency;
	int first_time = 0, hf = 0, vhf = 0, sync_read = 0, sync_write = 0;
	int err, ticks_cez;
	int cs = cfg->cs, freq = *freq_ptr;
	u32 reg;
	bool clk_dep = false;

	if (cfg->flags & ONENAND_SYNC_READ) {
	sync_read = 1;
	} else if (cfg->flags & ONENAND_SYNC_READWRITE) {
	sync_read = 1;
	sync_write = 1;
	} else
	return omap2_onenand_set_async_mode(cs, onenand_base);

	if (!freq) {
	/* Very first call freq is not known */
	err = omap2_onenand_set_async_mode(cs, onenand_base);
	if (err)
	return err;
	freq = omap2_onenand_get_freq(cfg, onenand_base, &clk_dep);
	first_time = 1;
	}

	switch (freq) {
	case 104:
	min_gpmc_clk_period = 9600; /* 104 MHz */
	t_ces = 3;
	t_avds = 4;
	t_avdh = 2;
	t_ach = 3;
	t_aavdh = 6;
	t_rdyo = 6;
	break;
	case 83:
	min_gpmc_clk_period = 12000; /* 83 MHz */
	t_ces = 5;
	t_avds = 4;
	t_avdh = 2;
	t_ach = 6;
	t_aavdh = 6;
	t_rdyo = 9;
	break;
	case 66:
	min_gpmc_clk_period = 15000; /* 66 MHz */
	t_ces = 6;
	t_avds = 5;
	t_avdh = 2;
	t_ach = 6;
	t_aavdh = 6;
	t_rdyo = 11;
	break;
	default:
	min_gpmc_clk_period = 18500; /* 54 MHz */
	t_ces = 7;
	t_avds = 7;
	t_avdh = 7;
	t_ach = 9;
	t_aavdh = 7;
	t_rdyo = 15;
	sync_write = 0;
	break;
	}

	div = gpmc_cs_calc_divider(cs, min_gpmc_clk_period);
	gpmc_clk_ns = gpmc_ticks_to_ns(div);
	if (gpmc_clk_ns < 15) /* >66Mhz */
	hf = 1;
	if (gpmc_clk_ns < 12) /* >83Mhz */
	vhf = 1;
	if (vhf)
	latency = 8;
	else if (hf)
	latency = 6;
	else if (gpmc_clk_ns >= 25) /* 40 MHz*/
	latency = 3;
	else
	latency = 4;

	if (clk_dep) {
	if (gpmc_clk_ns < 12) { /* >83Mhz */
	t_ces = 3;
	t_avds = 4;
	} else if (gpmc_clk_ns < 15) { /* >66Mhz */
	t_ces = 5;
	t_avds = 4;
	} else if (gpmc_clk_ns < 25) { /* >40Mhz */
	t_ces = 6;
	t_avds = 5;
	} else {
	t_ces = 7;
	t_avds = 7;
	}
	}

	if (first_time)
	set_onenand_cfg(onenand_base, latency,
	sync_read, sync_write, hf, vhf);

	if (div == 1) {
	reg = gpmc_cs_read_reg(cs, GPMC_CS_CONFIG2);
	reg \|= (1 << 7);
	gpmc_cs_write_reg(cs, GPMC_CS_CONFIG2, reg);
	reg = gpmc_cs_read_reg(cs, GPMC_CS_CONFIG3);
	reg \|= (1 << 7);
	gpmc_cs_write_reg(cs, GPMC_CS_CONFIG3, reg);
	reg = gpmc_cs_read_reg(cs, GPMC_CS_CONFIG4);
	reg \|= (1 << 7);
	reg \|= (1 << 23);
	gpmc_cs_write_reg(cs, GPMC_CS_CONFIG4, reg);
	} else {
	reg = gpmc_cs_read_reg(cs, GPMC_CS_CONFIG2);
	reg &= ~(1 << 7);
	gpmc_cs_write_reg(cs, GPMC_CS_CONFIG2, reg);
	reg = gpmc_cs_read_reg(cs, GPMC_CS_CONFIG3);
	reg &= ~(1 << 7);
	gpmc_cs_write_reg(cs, GPMC_CS_CONFIG3, reg);
	reg = gpmc_cs_read_reg(cs, GPMC_CS_CONFIG4);
	reg &= ~(1 << 7);
	reg &= ~(1 << 23);
	gpmc_cs_write_reg(cs, GPMC_CS_CONFIG4, reg);
	}

	/* Set synchronous read timings */
	memset(&t, 0, sizeof(t));
	t.sync_clk = min_gpmc_clk_period;
	t.cs_on = 0;
	t.adv_on = 0;
	fclk_offset_ns = gpmc_round_ns_to_ticks(max_t(int, t_ces, t_avds));
	fclk_offset = gpmc_ns_to_ticks(fclk_offset_ns);
	t.page_burst_access = gpmc_clk_ns;

	/* Read */
	t.adv_rd_off = gpmc_ticks_to_ns(fclk_offset + gpmc_ns_to_ticks(t_avdh));
	t.oe_on = gpmc_ticks_to_ns(fclk_offset + gpmc_ns_to_ticks(t_ach));
	/* Force at least 1 clk between AVD High to OE Low */
	if (t.oe_on <= t.adv_rd_off)
	t.oe_on = t.adv_rd_off + gpmc_round_ns_to_ticks(1);
	t.access = gpmc_ticks_to_ns(fclk_offset + (latency + 1) * div);
	t.oe_off = t.access + gpmc_round_ns_to_ticks(1);
	t.cs_rd_off = t.oe_off;
	ticks_cez = ((gpmc_ns_to_ticks(t_cez) + div - 1) / div) * div;
	t.rd_cycle = gpmc_ticks_to_ns(fclk_offset + (latency + 1) * div +
	ticks_cez);

	/* Write */
	if (sync_write) {
	t.adv_wr_off = t.adv_rd_off;
	t.we_on = 0;
	t.we_off = t.cs_rd_off;
	t.cs_wr_off = t.cs_rd_off;
	t.wr_cycle = t.rd_cycle;
	if (cpu_is_omap34xx()) {
	t.wr_data_mux_bus = gpmc_ticks_to_ns(fclk_offset +
	gpmc_ps_to_ticks(min_gpmc_clk_period +
	t_rdyo * 1000));
	t.wr_access = t.access;
	}
	} else {
	t.adv_wr_off = gpmc_round_ns_to_ticks(max_t(int,
	t_avdp, t_cer));
	t.we_on = t.adv_wr_off + gpmc_round_ns_to_ticks(t_aavdh);
	t.we_off = t.we_on + gpmc_round_ns_to_ticks(t_wpl);
	t.cs_wr_off = t.we_off + gpmc_round_ns_to_ticks(t_wph);
	t.wr_cycle = t.cs_wr_off + gpmc_round_ns_to_ticks(t_cez);
	if (cpu_is_omap34xx()) {
	t.wr_data_mux_bus = t.we_on;
	t.wr_access = t.we_on + gpmc_round_ns_to_ticks(t_ds);
	}
	}

	/* Configure GPMC for synchronous read */
	gpmc_cs_write_reg(cs, GPMC_CS_CONFIG1,
	GPMC_CONFIG1_WRAPBURST_SUPP \|
	GPMC_CONFIG1_READMULTIPLE_SUPP \|
	(sync_read ? GPMC_CONFIG1_READTYPE_SYNC : 0) \|
	(sync_write ? GPMC_CONFIG1_WRITEMULTIPLE_SUPP : 0) \|
	(sync_write ? GPMC_CONFIG1_WRITETYPE_SYNC : 0) \|
	GPMC_CONFIG1_CLKACTIVATIONTIME(fclk_offset) \|
	GPMC_CONFIG1_PAGE_LEN(2) \|
	(cpu_is_omap34xx() ? 0 :
	(GPMC_CONFIG1_WAIT_READ_MON \|
	GPMC_CONFIG1_WAIT_PIN_SEL(0))) \|
	GPMC_CONFIG1_DEVICESIZE_16 \|
	GPMC_CONFIG1_DEVICETYPE_NOR \|
	GPMC_CONFIG1_MUXADDDATA);

	err = gpmc_cs_set_timings(cs, &t);
	if (err)
	return err;

	set_onenand_cfg(onenand_base, latency, sync_read, sync_write, hf, vhf);

	*freq_ptr = freq;

	return 0;
	}

	static int gpmc_onenand_setup(void __iomem onenand_base, int freq_ptr)
	{
	struct device *dev = &gpmc_onenand_device.dev;

	/* Set sync timings in GPMC */
	if (omap2_onenand_set_sync_mode(gpmc_onenand_data, onenand_base,
	freq_ptr) < 0) {
	dev_err(dev, "Unable to set synchronous mode\n");
	return -EINVAL;
	}

	return 0;
	}

	void __init gpmc_onenand_init(struct omap_onenand_platform_data *_onenand_data)
	{
	gpmc_onenand_data = _onenand_data;
	gpmc_onenand_data->onenand_setup = gpmc_onenand_setup;
	gpmc_onenand_device.dev.platform_data = gpmc_onenand_data;

	if (cpu_is_omap24xx() &&
	(gpmc_onenand_data->flags & ONENAND_SYNC_READWRITE)) {
	printk(KERN_ERR "Onenand using only SYNC_READ on 24xx\n");
	gpmc_onenand_data->flags &= ~ONENAND_SYNC_READWRITE;
	gpmc_onenand_data->flags \|= ONENAND_SYNC_READ;
	}

	if (platform_device_register(&gpmc_onenand_device) < 0) {
	printk(KERN_ERR "Unable to register OneNAND device\n");
	return;
	}
	}