ARM: OMAP: Add GPMC support for OMAP2

Implement basic support for General-Purpose Memory Controller
as found on OMAP2420.

Dynamic CS address space allocation still needs to be done.

Signed-off-by: Juha Yrjola <juha.yrjola@solidboot.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>
This commit is contained in:
Juha Yrjola 2006-06-26 16:16:16 -07:00 committed by Tony Lindgren
parent 7ff879dbcd
commit 4bbbc1adc2
4 changed files with 304 additions and 1 deletions

View File

@ -3,7 +3,8 @@
#
# Common support
obj-y := irq.o id.o io.o sram-fn.o memory.o prcm.o clock.o mux.o devices.o serial.o
obj-y := irq.o id.o io.o sram-fn.o memory.o prcm.o clock.o mux.o devices.o \
serial.o gpmc.o
obj-$(CONFIG_OMAP_MPU_TIMER) += timer-gp.o

209
arch/arm/mach-omap2/gpmc.c Normal file
View File

@ -0,0 +1,209 @@
/*
* 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 <asm/io.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
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, int div, 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_clk_period(div) * 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 CLK period is %d (div %d)\n",
cs, get_gpmc_clk_period(div), div);
#endif
l = gpmc_cs_read_reg(cs, GPMC_CS_CONFIG1);
l &= ~0x03;
l |= (div - 1);
return 0;
}
unsigned long gpmc_cs_get_base_addr(int cs)
{
return (gpmc_cs_read_reg(cs, GPMC_CS_CONFIG7) & 0x1f) << 24;
}
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);
}

View File

@ -27,6 +27,7 @@
extern void omap_sram_init(void);
extern int omap2_clk_init(void);
extern void omap2_check_revision(void);
extern void gpmc_init(void);
/*
* The machine specific code may provide the extra mapping besides the
@ -67,4 +68,5 @@ void __init omap2_init_common_hw(void)
{
omap2_mux_init();
omap2_clk_init();
gpmc_init();
}

View File

@ -0,0 +1,91 @@
/*
* General-Purpose Memory Controller for OMAP2
*
* Copyright (C) 2005-2006 Nokia Corporation
*
* 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.
*/
#ifndef __OMAP2_GPMC_H
#define __OMAP2_GPMC_H
#define GPMC_CS_CONFIG1 0x00
#define GPMC_CS_CONFIG2 0x04
#define GPMC_CS_CONFIG3 0x08
#define GPMC_CS_CONFIG4 0x0c
#define GPMC_CS_CONFIG5 0x10
#define GPMC_CS_CONFIG6 0x14
#define GPMC_CS_CONFIG7 0x18
#define GPMC_CS_NAND_COMMAND 0x1c
#define GPMC_CS_NAND_ADDRESS 0x20
#define GPMC_CS_NAND_DATA 0x24
#define GPMC_CONFIG1_WRAPBURST_SUPP (1 << 31)
#define GPMC_CONFIG1_READMULTIPLE_SUPP (1 << 20)
#define GPMC_CONFIG1_READTYPE_ASYNC (0 << 29)
#define GPMC_CONFIG1_READTYPE_SYNC (1 << 29)
#define GPMC_CONFIG1_WRITETYPE_ASYNC (0 << 27)
#define GPMC_CONFIG1_WRITETYPE_SYNC (1 << 27)
#define GPMC_CONFIG1_CLKACTIVATIONTIME(val) ((val & 3) << 25)
#define GPMC_CONFIG1_PAGE_LEN(val) ((val & 3) << 23)
#define GPMC_CONFIG1_WAIT_READ_MON (1 << 22)
#define GPMC_CONFIG1_WAIT_WRITE_MON (1 << 21)
#define GPMC_CONFIG1_WAIT_MON_IIME(val) ((val & 3) << 18)
#define GPMC_CONFIG1_WAIT_PIN_SEL(val) ((val & 3) << 16)
#define GPMC_CONFIG1_DEVICESIZE(val) ((val & 3) << 12)
#define GPMC_CONFIG1_DEVICESIZE_16 GPMC_CONFIG1_DEVICESIZE(1)
#define GPMC_CONFIG1_DEVICETYPE(val) ((val & 3) << 10)
#define GPMC_CONFIG1_DEVICETYPE_NOR GPMC_CONFIG1_DEVICETYPE(0)
#define GPMC_CONFIG1_DEVICETYPE_NAND GPMC_CONFIG1_DEVICETYPE(1)
#define GPMC_CONFIG1_MUXADDDATA (1 << 9)
#define GPMC_CONFIG1_TIME_PARA_GRAN (1 << 4)
#define GPMC_CONFIG1_FCLK_DIV(val) (val & 3)
#define GPMC_CONFIG1_FCLK_DIV2 (GPMC_CONFIG1_FCLK_DIV(1))
#define GPMC_CONFIG1_FCLK_DIV3 (GPMC_CONFIG1_FCLK_DIV(2))
#define GPMC_CONFIG1_FCLK_DIV4 (GPMC_CONFIG1_FCLK_DIV(3))
/*
* Note that all values in this struct are in nanoseconds, while
* the register values are in gpmc_fck cycles.
*/
struct gpmc_timings {
/* Minimum clock period for synchronous mode */
u16 sync_clk;
/* Chip-select signal timings corresponding to GPMC_CS_CONFIG2 */
u16 cs_on; /* Assertion time */
u16 cs_rd_off; /* Read deassertion time */
u16 cs_wr_off; /* Write deassertion time */
/* ADV signal timings corresponding to GPMC_CONFIG3 */
u16 adv_on; /* Assertion time */
u16 adv_rd_off; /* Read deassertion time */
u16 adv_wr_off; /* Write deassertion time */
/* WE signals timings corresponding to GPMC_CONFIG4 */
u16 we_on; /* WE assertion time */
u16 we_off; /* WE deassertion time */
/* OE signals timings corresponding to GPMC_CONFIG4 */
u16 oe_on; /* OE assertion time */
u16 oe_off; /* OE deassertion time */
/* Access time and cycle time timings corresponding to GPMC_CONFIG5 */
u16 page_burst_access; /* Multiple access word delay */
u16 access; /* Start-cycle to first data valid delay */
u16 rd_cycle; /* Total read cycle time */
u16 wr_cycle; /* Total write cycle time */
};
extern unsigned int gpmc_ns_to_ticks(unsigned int time_ns);
extern void gpmc_cs_write_reg(int cs, int idx, u32 val);
extern u32 gpmc_cs_read_reg(int cs, int idx);
extern int gpmc_cs_calc_divider(int cs, unsigned int sync_clk);
extern int gpmc_cs_set_timings(int cs, const struct gpmc_timings *t);
extern unsigned long gpmc_cs_get_base_addr(int cs);
#endif