arch/arm/mach-omap2/gpmc.c - kernel/msm-5.4 - Gitiles

 /*
  * GPMC support functions
  *
  * Copyright (C) 2005-2006 Nokia Corporation
  *
  * Author: Juha Yrjola
  *
  * 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/kernel.h>
 #include <linux/init.h>
 #include <linux/err.h>
 #include <linux/clk.h>
 #include <linux/ioport.h>
 #include <linux/spinlock.h>

 #include <asm/io.h>
 #include <asm/mach-types.h>
 #include <asm/arch/gpmc.h>

 #undef DEBUG

 #define GPMC_BASE		0x6800a000
 #define GPMC_REVISION		0x00
 #define GPMC_SYSCONFIG		0x10
 #define GPMC_SYSSTATUS		0x14
 #define GPMC_IRQSTATUS		0x18
 #define GPMC_IRQENABLE		0x1c
 #define GPMC_TIMEOUT_CONTROL	0x40
 #define GPMC_ERR_ADDRESS	0x44
 #define GPMC_ERR_TYPE		0x48
 #define GPMC_CONFIG		0x50
 #define GPMC_STATUS		0x54
 #define GPMC_PREFETCH_CONFIG1	0x1e0
 #define GPMC_PREFETCH_CONFIG2	0x1e4
 #define GPMC_PREFETCH_CONTROL	0x1e8
 #define GPMC_PREFETCH_STATUS	0x1f0
 #define GPMC_ECC_CONFIG		0x1f4
 #define GPMC_ECC_CONTROL	0x1f8
 #define GPMC_ECC_SIZE_CONFIG	0x1fc

 #define GPMC_CS0		0x60
 #define GPMC_CS_SIZE		0x30

 #define GPMC_CS_NUM		8
 #define GPMC_MEM_START		0x00000000
 #define GPMC_MEM_END		0x3FFFFFFF
 #define BOOT_ROM_SPACE		0x100000	/* 1MB */

 #define GPMC_CHUNK_SHIFT	24		/* 16 MB */
 #define GPMC_SECTION_SHIFT	28		/* 128 MB */

 static struct resource	gpmc_mem_root;
 static struct resource	gpmc_cs_mem[GPMC_CS_NUM];
 static spinlock_t	gpmc_mem_lock = SPIN_LOCK_UNLOCKED;
 static unsigned		gpmc_cs_map;

 static void __iomem *gpmc_base =
 	(void __iomem *) IO_ADDRESS(GPMC_BASE);
 static void __iomem *gpmc_cs_base =
 	(void __iomem *) IO_ADDRESS(GPMC_BASE) + GPMC_CS0;

 static struct clk *gpmc_l3_clk;

 static void gpmc_write_reg(int idx, u32 val)
 {
 	__raw_writel(val, gpmc_base + idx);
 }

 static u32 gpmc_read_reg(int idx)
 {
 	return __raw_readl(gpmc_base + idx);
 }

 void gpmc_cs_write_reg(int cs, int idx, u32 val)
 {
 	void __iomem *reg_addr;

 	reg_addr = gpmc_cs_base + (cs * GPMC_CS_SIZE) + idx;
 	__raw_writel(val, reg_addr);
 }

 u32 gpmc_cs_read_reg(int cs, int idx)
 {
 	return __raw_readl(gpmc_cs_base + (cs * GPMC_CS_SIZE) + idx);
 }

 /* TODO: Add support for gpmc_fck to clock framework and use it */
 static unsigned long gpmc_get_fclk_period(void)
 {
 	/* In picoseconds */
 	return 1000000000 / ((clk_get_rate(gpmc_l3_clk)) / 1000);
 }

 unsigned int gpmc_ns_to_ticks(unsigned int time_ns)
 {
 	unsigned long tick_ps;

 	/* Calculate in picosecs to yield more exact results */
 	tick_ps = gpmc_get_fclk_period();

 	return (time_ns * 1000 + tick_ps - 1) / tick_ps;
 }

 #ifdef DEBUG
 static int set_gpmc_timing_reg(int cs, int reg, int st_bit, int end_bit,
 			       int time, const char *name)
 #else
 static int set_gpmc_timing_reg(int cs, int reg, int st_bit, int end_bit,
 			       int time)
 #endif
 {
 	u32 l;
 	int ticks, mask, nr_bits;

 	if (time == 0)
 		ticks = 0;
 	else
 		ticks = gpmc_ns_to_ticks(time);
 	nr_bits = end_bit - st_bit + 1;
 	if (ticks >= 1 << nr_bits)
 		return -1;

 	mask = (1 << nr_bits) - 1;
 	l = gpmc_cs_read_reg(cs, reg);
 #ifdef DEBUG
 	printk(KERN_INFO "GPMC CS%d: %-10s: %d ticks, %3lu ns (was %i ticks)\n",
 	       cs, name, ticks, gpmc_get_fclk_period() * ticks / 1000,
 	       (l >> st_bit) & mask);
 #endif
 	l &= ~(mask << st_bit);
 	l |= ticks << st_bit;
 	gpmc_cs_write_reg(cs, reg, l);

 	return 0;
 }

 #ifdef DEBUG
 #define GPMC_SET_ONE(reg, st, end, field) \
 	if (set_gpmc_timing_reg(cs, (reg), (st), (end),		\
 			t->field, #field) < 0)			\
 		return -1
 #else
 #define GPMC_SET_ONE(reg, st, end, field) \
 	if (set_gpmc_timing_reg(cs, (reg), (st), (end), t->field) < 0) \
 		return -1
 #endif

 int gpmc_cs_calc_divider(int cs, unsigned int sync_clk)
 {
 	int div;
 	u32 l;

 	l = sync_clk * 1000 + (gpmc_get_fclk_period() - 1);
 	div = l / gpmc_get_fclk_period();
 	if (div > 4)
 		return -1;
 	if (div < 0)
 		div = 1;

 	return div;
 }

 int gpmc_cs_set_timings(int cs, const struct gpmc_timings *t)
 {
 	int div;
 	u32 l;

 	div = gpmc_cs_calc_divider(cs, t->sync_clk);
 	if (div < 0)
 		return -1;

 	GPMC_SET_ONE(GPMC_CS_CONFIG2,  0,  3, cs_on);
 	GPMC_SET_ONE(GPMC_CS_CONFIG2,  8, 12, cs_rd_off);
 	GPMC_SET_ONE(GPMC_CS_CONFIG2, 16, 20, cs_wr_off);

 	GPMC_SET_ONE(GPMC_CS_CONFIG3,  0,  3, adv_on);
 	GPMC_SET_ONE(GPMC_CS_CONFIG3,  8, 12, adv_rd_off);
 	GPMC_SET_ONE(GPMC_CS_CONFIG3, 16, 20, adv_wr_off);

 	GPMC_SET_ONE(GPMC_CS_CONFIG4,  0,  3, oe_on);
 	GPMC_SET_ONE(GPMC_CS_CONFIG4,  8, 12, oe_off);
 	GPMC_SET_ONE(GPMC_CS_CONFIG4, 16, 19, we_on);
 	GPMC_SET_ONE(GPMC_CS_CONFIG4, 24, 28, we_off);

 	GPMC_SET_ONE(GPMC_CS_CONFIG5,  0,  4, rd_cycle);
 	GPMC_SET_ONE(GPMC_CS_CONFIG5,  8, 12, wr_cycle);
 	GPMC_SET_ONE(GPMC_CS_CONFIG5, 16, 20, access);

 	GPMC_SET_ONE(GPMC_CS_CONFIG5, 24, 27, page_burst_access);

 #ifdef DEBUG
 	printk(KERN_INFO "GPMC CS%d CLK period is %lu (div %d)\n",
 	       cs, gpmc_get_fclk_period(), div);
 #endif

 	l = gpmc_cs_read_reg(cs, GPMC_CS_CONFIG1);
 	l &= ~0x03;
 	l |= (div - 1);

 	return 0;
 }

 static void gpmc_cs_enable_mem(int cs, u32 base, u32 size)
 {
 	u32 l;
 	u32 mask;

 	mask = (1 << GPMC_SECTION_SHIFT) - size;
 	l = gpmc_cs_read_reg(cs, GPMC_CS_CONFIG7);
 	l &= ~0x3f;
 	l = (base >> GPMC_CHUNK_SHIFT) & 0x3f;
 	l &= ~(0x0f << 8);
 	l |= ((mask >> GPMC_CHUNK_SHIFT) & 0x0f) << 8;
 	l |= 1 << 6;		/* CSVALID */
 	gpmc_cs_write_reg(cs, GPMC_CS_CONFIG7, l);
 }

 static void gpmc_cs_disable_mem(int cs)
 {
 	u32 l;

 	l = gpmc_cs_read_reg(cs, GPMC_CS_CONFIG7);
 	l &= ~(1 << 6);		/* CSVALID */
 	gpmc_cs_write_reg(cs, GPMC_CS_CONFIG7, l);
 }

 static void gpmc_cs_get_memconf(int cs, u32 *base, u32 *size)
 {
 	u32 l;
 	u32 mask;

 	l = gpmc_cs_read_reg(cs, GPMC_CS_CONFIG7);
 	*base = (l & 0x3f) << GPMC_CHUNK_SHIFT;
 	mask = (l >> 8) & 0x0f;
 	*size = (1 << GPMC_SECTION_SHIFT) - (mask << GPMC_CHUNK_SHIFT);
 }

 static int gpmc_cs_mem_enabled(int cs)
 {
 	u32 l;

 	l = gpmc_cs_read_reg(cs, GPMC_CS_CONFIG7);
 	return l & (1 << 6);
 }

 static void gpmc_cs_set_reserved(int cs, int reserved)
 {
 	gpmc_cs_map &= ~(1 << cs);
 	gpmc_cs_map |= (reserved ? 1 : 0) << cs;
 }

 static int gpmc_cs_reserved(int cs)
 {
 	return gpmc_cs_map & (1 << cs);
 }

 static unsigned long gpmc_mem_align(unsigned long size)
 {
 	int order;

 	size = (size - 1) >> (GPMC_CHUNK_SHIFT - 1);
 	order = GPMC_CHUNK_SHIFT - 1;
 	do {
 		size >>= 1;
 		order++;
 	} while (size);
 	size = 1 << order;
 	return size;
 }

 static int gpmc_cs_insert_mem(int cs, unsigned long base, unsigned long size)
 {
 	struct resource	*res = &gpmc_cs_mem[cs];
 	int r;

 	size = gpmc_mem_align(size);
 	spin_lock(&gpmc_mem_lock);
 	res->start = base;
 	res->end = base + size - 1;
 	r = request_resource(&gpmc_mem_root, res);
 	spin_unlock(&gpmc_mem_lock);

 	return r;
 }

 int gpmc_cs_request(int cs, unsigned long size, unsigned long *base)
 {
 	struct resource *res = &gpmc_cs_mem[cs];
 	int r = -1;

 	if (cs > GPMC_CS_NUM)
 		return -ENODEV;

 	size = gpmc_mem_align(size);
 	if (size > (1 << GPMC_SECTION_SHIFT))
 		return -ENOMEM;

 	spin_lock(&gpmc_mem_lock);
 	if (gpmc_cs_reserved(cs)) {
 		r = -EBUSY;
 		goto out;
 	}
 	if (gpmc_cs_mem_enabled(cs))
 		r = adjust_resource(res, res->start & ~(size - 1), size);
 	if (r < 0)
 		r = allocate_resource(&gpmc_mem_root, res, size, 0, ~0,
 				      size, NULL, NULL);
 	if (r < 0)
 		goto out;

 	gpmc_cs_enable_mem(cs, res->start, res->end - res->start + 1);
 	*base = res->start;
 	gpmc_cs_set_reserved(cs, 1);
 out:
 	spin_unlock(&gpmc_mem_lock);
 	return r;
 }

 void gpmc_cs_free(int cs)
 {
 	spin_lock(&gpmc_mem_lock);
 	if (cs >= GPMC_CS_NUM || !gpmc_cs_reserved(cs)) {
 		printk(KERN_ERR "Trying to free non-reserved GPMC CS%d\n", cs);
 		BUG();
 		spin_unlock(&gpmc_mem_lock);
 		return;
 	}
 	gpmc_cs_disable_mem(cs);
 	release_resource(&gpmc_cs_mem[cs]);
 	gpmc_cs_set_reserved(cs, 0);
 	spin_unlock(&gpmc_mem_lock);
 }

 void __init gpmc_mem_init(void)
 {
 	int cs;
 	unsigned long boot_rom_space = 0;

 	/* never allocate the first page, to facilitate bug detection;
 	 * even if we didn't boot from ROM.
 	 */
 	boot_rom_space = BOOT_ROM_SPACE;
 	/* In apollon the CS0 is mapped as 0x0000 0000 */
 	if (machine_is_omap_apollon())
 		boot_rom_space = 0;
 	gpmc_mem_root.start = GPMC_MEM_START + boot_rom_space;
 	gpmc_mem_root.end = GPMC_MEM_END;

 	/* Reserve all regions that has been set up by bootloader */
 	for (cs = 0; cs < GPMC_CS_NUM; cs++) {
 		u32 base, size;

 		if (!gpmc_cs_mem_enabled(cs))
 			continue;
 		gpmc_cs_get_memconf(cs, &base, &size);
 		if (gpmc_cs_insert_mem(cs, base, size) < 0)
 			BUG();
 	}
 }

 void __init gpmc_init(void)
 {
 	u32 l;

 	gpmc_l3_clk = clk_get(NULL, "core_l3_ck");
 	BUG_ON(IS_ERR(gpmc_l3_clk));

 	l = gpmc_read_reg(GPMC_REVISION);
 	printk(KERN_INFO "GPMC revision %d.%d\n", (l >> 4) & 0x0f, l & 0x0f);
 	/* Set smart idle mode and automatic L3 clock gating */
 	l = gpmc_read_reg(GPMC_SYSCONFIG);
 	l &= 0x03 << 3;
 	l |= (0x02 << 3) | (1 << 0);
 	gpmc_write_reg(GPMC_SYSCONFIG, l);

 	gpmc_mem_init();
 }
	/*
	* GPMC support functions
	*
	* Copyright (C) 2005-2006 Nokia Corporation
	*
	* Author: Juha Yrjola
	*
	* 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/kernel.h>
	#include <linux/init.h>
	#include <linux/err.h>
	#include <linux/clk.h>
	#include <linux/ioport.h>
	#include <linux/spinlock.h>

	#include <asm/io.h>
	#include <asm/mach-types.h>
	#include <asm/arch/gpmc.h>

	#undef DEBUG

	#define GPMC_BASE 0x6800a000
	#define GPMC_REVISION 0x00
	#define GPMC_SYSCONFIG 0x10
	#define GPMC_SYSSTATUS 0x14
	#define GPMC_IRQSTATUS 0x18
	#define GPMC_IRQENABLE 0x1c
	#define GPMC_TIMEOUT_CONTROL 0x40
	#define GPMC_ERR_ADDRESS 0x44
	#define GPMC_ERR_TYPE 0x48
	#define GPMC_CONFIG 0x50
	#define GPMC_STATUS 0x54
	#define GPMC_PREFETCH_CONFIG1 0x1e0
	#define GPMC_PREFETCH_CONFIG2 0x1e4
	#define GPMC_PREFETCH_CONTROL 0x1e8
	#define GPMC_PREFETCH_STATUS 0x1f0
	#define GPMC_ECC_CONFIG 0x1f4
	#define GPMC_ECC_CONTROL 0x1f8
	#define GPMC_ECC_SIZE_CONFIG 0x1fc

	#define GPMC_CS0 0x60
	#define GPMC_CS_SIZE 0x30

	#define GPMC_CS_NUM 8
	#define GPMC_MEM_START 0x00000000
	#define GPMC_MEM_END 0x3FFFFFFF
	#define BOOT_ROM_SPACE 0x100000 /* 1MB */

	#define GPMC_CHUNK_SHIFT 24 /* 16 MB */
	#define GPMC_SECTION_SHIFT 28 /* 128 MB */

	static struct resource gpmc_mem_root;
	static struct resource gpmc_cs_mem[GPMC_CS_NUM];
	static spinlock_t gpmc_mem_lock = SPIN_LOCK_UNLOCKED;
	static unsigned gpmc_cs_map;

	static void __iomem *gpmc_base =
	(void __iomem *) IO_ADDRESS(GPMC_BASE);
	static void __iomem *gpmc_cs_base =
	(void __iomem *) IO_ADDRESS(GPMC_BASE) + GPMC_CS0;

	static struct clk *gpmc_l3_clk;

	static void gpmc_write_reg(int idx, u32 val)
	{
	__raw_writel(val, gpmc_base + idx);
	}

	static u32 gpmc_read_reg(int idx)
	{
	return __raw_readl(gpmc_base + idx);
	}

	void gpmc_cs_write_reg(int cs, int idx, u32 val)
	{
	void __iomem *reg_addr;

	reg_addr = gpmc_cs_base + (cs * GPMC_CS_SIZE) + idx;
	__raw_writel(val, reg_addr);
	}

	u32 gpmc_cs_read_reg(int cs, int idx)
	{
	return __raw_readl(gpmc_cs_base + (cs * GPMC_CS_SIZE) + idx);
	}

	/* TODO: Add support for gpmc_fck to clock framework and use it */
	static unsigned long gpmc_get_fclk_period(void)
	{
	/* In picoseconds */
	return 1000000000 / ((clk_get_rate(gpmc_l3_clk)) / 1000);
	}

	unsigned int gpmc_ns_to_ticks(unsigned int time_ns)
	{
	unsigned long tick_ps;

	/* Calculate in picosecs to yield more exact results */
	tick_ps = gpmc_get_fclk_period();

	return (time_ns * 1000 + tick_ps - 1) / tick_ps;
	}

	#ifdef DEBUG
	static int set_gpmc_timing_reg(int cs, int reg, int st_bit, int end_bit,
	int time, const char *name)
	#else
	static int set_gpmc_timing_reg(int cs, int reg, int st_bit, int end_bit,
	int time)
	#endif
	{
	u32 l;
	int ticks, mask, nr_bits;

	if (time == 0)
	ticks = 0;
	else
	ticks = gpmc_ns_to_ticks(time);
	nr_bits = end_bit - st_bit + 1;
	if (ticks >= 1 << nr_bits)
	return -1;

	mask = (1 << nr_bits) - 1;
	l = gpmc_cs_read_reg(cs, reg);
	#ifdef DEBUG
	printk(KERN_INFO "GPMC CS%d: %-10s: %d ticks, %3lu ns (was %i ticks)\n",
	cs, name, ticks, gpmc_get_fclk_period() * ticks / 1000,
	(l >> st_bit) & mask);
	#endif
	l &= ~(mask << st_bit);
	l \|= ticks << st_bit;
	gpmc_cs_write_reg(cs, reg, l);

	return 0;
	}

	#ifdef DEBUG
	#define GPMC_SET_ONE(reg, st, end, field) \
	if (set_gpmc_timing_reg(cs, (reg), (st), (end), \
	t->field, #field) < 0) \
	return -1
	#else
	#define GPMC_SET_ONE(reg, st, end, field) \
	if (set_gpmc_timing_reg(cs, (reg), (st), (end), t->field) < 0) \
	return -1
	#endif

	int gpmc_cs_calc_divider(int cs, unsigned int sync_clk)
	{
	int div;
	u32 l;

	l = sync_clk * 1000 + (gpmc_get_fclk_period() - 1);
	div = l / gpmc_get_fclk_period();
	if (div > 4)
	return -1;
	if (div < 0)
	div = 1;

	return div;
	}

	int gpmc_cs_set_timings(int cs, const struct gpmc_timings *t)
	{
	int div;
	u32 l;

	div = gpmc_cs_calc_divider(cs, t->sync_clk);
	if (div < 0)
	return -1;

	GPMC_SET_ONE(GPMC_CS_CONFIG2, 0, 3, cs_on);
	GPMC_SET_ONE(GPMC_CS_CONFIG2, 8, 12, cs_rd_off);
	GPMC_SET_ONE(GPMC_CS_CONFIG2, 16, 20, cs_wr_off);

	GPMC_SET_ONE(GPMC_CS_CONFIG3, 0, 3, adv_on);
	GPMC_SET_ONE(GPMC_CS_CONFIG3, 8, 12, adv_rd_off);
	GPMC_SET_ONE(GPMC_CS_CONFIG3, 16, 20, adv_wr_off);

	GPMC_SET_ONE(GPMC_CS_CONFIG4, 0, 3, oe_on);
	GPMC_SET_ONE(GPMC_CS_CONFIG4, 8, 12, oe_off);
	GPMC_SET_ONE(GPMC_CS_CONFIG4, 16, 19, we_on);
	GPMC_SET_ONE(GPMC_CS_CONFIG4, 24, 28, we_off);

	GPMC_SET_ONE(GPMC_CS_CONFIG5, 0, 4, rd_cycle);
	GPMC_SET_ONE(GPMC_CS_CONFIG5, 8, 12, wr_cycle);
	GPMC_SET_ONE(GPMC_CS_CONFIG5, 16, 20, access);

	GPMC_SET_ONE(GPMC_CS_CONFIG5, 24, 27, page_burst_access);

	#ifdef DEBUG
	printk(KERN_INFO "GPMC CS%d CLK period is %lu (div %d)\n",
	cs, gpmc_get_fclk_period(), div);
	#endif

	l = gpmc_cs_read_reg(cs, GPMC_CS_CONFIG1);
	l &= ~0x03;
	l \|= (div - 1);

	return 0;
	}

	static void gpmc_cs_enable_mem(int cs, u32 base, u32 size)
	{
	u32 l;
	u32 mask;

	mask = (1 << GPMC_SECTION_SHIFT) - size;
	l = gpmc_cs_read_reg(cs, GPMC_CS_CONFIG7);
	l &= ~0x3f;
	l = (base >> GPMC_CHUNK_SHIFT) & 0x3f;
	l &= ~(0x0f << 8);
	l \|= ((mask >> GPMC_CHUNK_SHIFT) & 0x0f) << 8;
	l \|= 1 << 6; /* CSVALID */
	gpmc_cs_write_reg(cs, GPMC_CS_CONFIG7, l);
	}

	static void gpmc_cs_disable_mem(int cs)
	{
	u32 l;

	l = gpmc_cs_read_reg(cs, GPMC_CS_CONFIG7);
	l &= ~(1 << 6); /* CSVALID */
	gpmc_cs_write_reg(cs, GPMC_CS_CONFIG7, l);
	}

	static void gpmc_cs_get_memconf(int cs, u32 base, u32 size)
	{
	u32 l;
	u32 mask;

	l = gpmc_cs_read_reg(cs, GPMC_CS_CONFIG7);
	*base = (l & 0x3f) << GPMC_CHUNK_SHIFT;
	mask = (l >> 8) & 0x0f;
	*size = (1 << GPMC_SECTION_SHIFT) - (mask << GPMC_CHUNK_SHIFT);
	}

	static int gpmc_cs_mem_enabled(int cs)
	{
	u32 l;

	l = gpmc_cs_read_reg(cs, GPMC_CS_CONFIG7);
	return l & (1 << 6);
	}

	static void gpmc_cs_set_reserved(int cs, int reserved)
	{
	gpmc_cs_map &= ~(1 << cs);
	gpmc_cs_map \|= (reserved ? 1 : 0) << cs;
	}

	static int gpmc_cs_reserved(int cs)
	{
	return gpmc_cs_map & (1 << cs);
	}

	static unsigned long gpmc_mem_align(unsigned long size)
	{
	int order;

	size = (size - 1) >> (GPMC_CHUNK_SHIFT - 1);
	order = GPMC_CHUNK_SHIFT - 1;
	do {
	size >>= 1;
	order++;
	} while (size);
	size = 1 << order;
	return size;
	}

	static int gpmc_cs_insert_mem(int cs, unsigned long base, unsigned long size)
	{
	struct resource *res = &gpmc_cs_mem[cs];
	int r;

	size = gpmc_mem_align(size);
	spin_lock(&gpmc_mem_lock);
	res->start = base;
	res->end = base + size - 1;
	r = request_resource(&gpmc_mem_root, res);
	spin_unlock(&gpmc_mem_lock);

	return r;
	}

	int gpmc_cs_request(int cs, unsigned long size, unsigned long *base)
	{
	struct resource *res = &gpmc_cs_mem[cs];
	int r = -1;

	if (cs > GPMC_CS_NUM)
	return -ENODEV;

	size = gpmc_mem_align(size);
	if (size > (1 << GPMC_SECTION_SHIFT))
	return -ENOMEM;

	spin_lock(&gpmc_mem_lock);
	if (gpmc_cs_reserved(cs)) {
	r = -EBUSY;
	goto out;
	}
	if (gpmc_cs_mem_enabled(cs))
	r = adjust_resource(res, res->start & ~(size - 1), size);
	if (r < 0)
	r = allocate_resource(&gpmc_mem_root, res, size, 0, ~0,
	size, NULL, NULL);
	if (r < 0)
	goto out;

	gpmc_cs_enable_mem(cs, res->start, res->end - res->start + 1);
	*base = res->start;
	gpmc_cs_set_reserved(cs, 1);
	out:
	spin_unlock(&gpmc_mem_lock);
	return r;
	}

	void gpmc_cs_free(int cs)
	{
	spin_lock(&gpmc_mem_lock);
	if (cs >= GPMC_CS_NUM \|\| !gpmc_cs_reserved(cs)) {
	printk(KERN_ERR "Trying to free non-reserved GPMC CS%d\n", cs);
	BUG();
	spin_unlock(&gpmc_mem_lock);
	return;
	}
	gpmc_cs_disable_mem(cs);
	release_resource(&gpmc_cs_mem[cs]);
	gpmc_cs_set_reserved(cs, 0);
	spin_unlock(&gpmc_mem_lock);
	}

	void __init gpmc_mem_init(void)
	{
	int cs;
	unsigned long boot_rom_space = 0;

	/* never allocate the first page, to facilitate bug detection;
	* even if we didn't boot from ROM.
	*/
	boot_rom_space = BOOT_ROM_SPACE;
	/* In apollon the CS0 is mapped as 0x0000 0000 */
	if (machine_is_omap_apollon())
	boot_rom_space = 0;
	gpmc_mem_root.start = GPMC_MEM_START + boot_rom_space;
	gpmc_mem_root.end = GPMC_MEM_END;

	/* Reserve all regions that has been set up by bootloader */
	for (cs = 0; cs < GPMC_CS_NUM; cs++) {
	u32 base, size;

	if (!gpmc_cs_mem_enabled(cs))
	continue;
	gpmc_cs_get_memconf(cs, &base, &size);
	if (gpmc_cs_insert_mem(cs, base, size) < 0)
	BUG();
	}
	}

	void __init gpmc_init(void)
	{
	u32 l;

	gpmc_l3_clk = clk_get(NULL, "core_l3_ck");
	BUG_ON(IS_ERR(gpmc_l3_clk));

	l = gpmc_read_reg(GPMC_REVISION);
	printk(KERN_INFO "GPMC revision %d.%d\n", (l >> 4) & 0x0f, l & 0x0f);
	/* Set smart idle mode and automatic L3 clock gating */
	l = gpmc_read_reg(GPMC_SYSCONFIG);
	l &= 0x03 << 3;
	l \|= (0x02 << 3) \| (1 << 0);
	gpmc_write_reg(GPMC_SYSCONFIG, l);

	gpmc_mem_init();
	}