416 lines
9.3 KiB
C
416 lines
9.3 KiB
C
/*
|
|
* 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
|
|
|
|
#ifdef CONFIG_ARCH_OMAP2420
|
|
#define GPMC_BASE 0x6800a000
|
|
#endif
|
|
|
|
#ifdef CONFIG_ARCH_OMAP2430
|
|
#define GPMC_BASE 0x6E000000
|
|
#endif
|
|
|
|
#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 0x1ec
|
|
#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 DEFINE_SPINLOCK(gpmc_mem_lock);
|
|
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_fck;
|
|
|
|
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);
|
|
}
|
|
|
|
unsigned long gpmc_get_fclk_period(void)
|
|
{
|
|
/* In picoseconds */
|
|
return 1000000000 / ((clk_get_rate(gpmc_fck)) / 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;
|
|
}
|
|
|
|
unsigned int gpmc_round_ns_to_ticks(unsigned int time_ns)
|
|
{
|
|
unsigned long ticks = gpmc_ns_to_ticks(time_ns);
|
|
|
|
return ticks * gpmc_get_fclk_period() / 1000;
|
|
}
|
|
|
|
#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) {
|
|
#ifdef DEBUG
|
|
printk(KERN_INFO "GPMC CS%d: %-10s* %3d ns, %3d ticks >= %d\n",
|
|
cs, name, time, ticks, 1 << nr_bits);
|
|
#endif
|
|
return -1;
|
|
}
|
|
|
|
mask = (1 << nr_bits) - 1;
|
|
l = gpmc_cs_read_reg(cs, reg);
|
|
#ifdef DEBUG
|
|
printk(KERN_INFO
|
|
"GPMC CS%d: %-10s: %3d ticks, %3lu ns (was %3i ticks) %3d ns\n",
|
|
cs, name, ticks, gpmc_get_fclk_period() * ticks / 1000,
|
|
(l >> st_bit) & mask, time);
|
|
#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);
|
|
|
|
/* caller is expected to have initialized CONFIG1 to cover
|
|
* at least sync vs async
|
|
*/
|
|
l = gpmc_cs_read_reg(cs, GPMC_CS_CONFIG1);
|
|
if (l & (GPMC_CONFIG1_READTYPE_SYNC | GPMC_CONFIG1_WRITETYPE_SYNC)) {
|
|
#ifdef DEBUG
|
|
printk(KERN_INFO "GPMC CS%d CLK period is %lu ns (div %d)\n",
|
|
cs, (div * gpmc_get_fclk_period()) / 1000, div);
|
|
#endif
|
|
l &= ~0x03;
|
|
l |= (div - 1);
|
|
gpmc_cs_write_reg(cs, GPMC_CS_CONFIG1, l);
|
|
}
|
|
|
|
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);
|
|
}
|
|
|
|
int gpmc_cs_set_reserved(int cs, int reserved)
|
|
{
|
|
if (cs > GPMC_CS_NUM)
|
|
return -ENODEV;
|
|
|
|
gpmc_cs_map &= ~(1 << cs);
|
|
gpmc_cs_map |= (reserved ? 1 : 0) << cs;
|
|
|
|
return 0;
|
|
}
|
|
|
|
int gpmc_cs_reserved(int cs)
|
|
{
|
|
if (cs > GPMC_CS_NUM)
|
|
return -ENODEV;
|
|
|
|
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_fck = clk_get(NULL, "gpmc_fck"); /* Always on ENABLE_ON_INIT */
|
|
if (IS_ERR(gpmc_fck))
|
|
WARN_ON(1);
|
|
else
|
|
clk_enable(gpmc_fck);
|
|
|
|
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();
|
|
}
|