/*
* linux/arch/arm/plat-omap/sram.c
*
* OMAP SRAM detection and management
*
* Copyright (C) 2005 Nokia Corporation
* Written by Tony Lindgren <tony@atomide.com>
*
* Copyright (C) 2009 Texas Instruments
* Added OMAP4 support - Santosh Shilimkar <santosh.shilimkar@ti.com>
*
* 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.
*/
#undef DEBUG
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/io.h>
#include <asm/tlb.h>
#include <asm/cacheflush.h>
#include <asm/mach/map.h>
#include <mach/sram.h>
#include <mach/board.h>
#include <mach/cpu.h>
#include <mach/control.h>
#if defined(CONFIG_ARCH_OMAP2) || defined(CONFIG_ARCH_OMAP3)
# include "../mach-omap2/prm.h"
# include "../mach-omap2/cm.h"
# include "../mach-omap2/sdrc.h"
#endif
#define OMAP1_SRAM_PA 0x20000000
#define OMAP1_SRAM_VA VMALLOC_END
#define OMAP2_SRAM_PA 0x40200000
#define OMAP2_SRAM_PUB_PA 0x4020f800
#define OMAP2_SRAM_VA 0xe3000000
#define OMAP2_SRAM_PUB_VA (OMAP2_SRAM_VA + 0x800)
#define OMAP3_SRAM_PA 0x40200000
#define OMAP3_SRAM_VA 0xd7000000
#define OMAP3_SRAM_PUB_PA 0x40208000
#define OMAP3_SRAM_PUB_VA 0xd7008000
#define OMAP4_SRAM_PA 0x40200000 /*0x402f0000*/
#define OMAP4_SRAM_VA 0xd7000000 /*0xd70f0000*/
#if defined(CONFIG_ARCH_OMAP24XX) || defined(CONFIG_ARCH_OMAP34XX)
#define SRAM_BOOTLOADER_SZ 0x00
#else
#define SRAM_BOOTLOADER_SZ 0x80
#endif
#define OMAP24XX_VA_REQINFOPERM0 IO_ADDRESS(0x68005048)
#define OMAP24XX_VA_READPERM0 IO_ADDRESS(0x68005050)
#define OMAP24XX_VA_WRITEPERM0 IO_ADDRESS(0x68005058)
#define OMAP34XX_VA_REQINFOPERM0 IO_ADDRESS(0x68012848)
#define OMAP34XX_VA_READPERM0 IO_ADDRESS(0x68012850)
#define OMAP34XX_VA_WRITEPERM0 IO_ADDRESS(0x68012858)
#define OMAP34XX_VA_ADDR_MATCH2 IO_ADDRESS(0x68012880)
#define OMAP34XX_VA_SMS_RG_ATT0 IO_ADDRESS(0x6C000048)
#define OMAP34XX_VA_CONTROL_STAT IO_ADDRESS(0x480022F0)
#define GP_DEVICE 0x300
#define ROUND_DOWN(value,boundary) ((value) & (~((boundary)-1)))
static unsigned long omap_sram_start;
static unsigned long omap_sram_base;
static unsigned long omap_sram_size;
static unsigned long omap_sram_ceil;
extern unsigned long omapfb_reserve_sram(unsigned long sram_pstart,
unsigned long sram_vstart,
unsigned long sram_size,
unsigned long pstart_avail,
unsigned long size_avail);
/*
* Depending on the target RAMFS firewall setup, the public usable amount of
* SRAM varies. The default accessible size for all device types is 2k. A GP
* device allows ARM11 but not other initiators for full size. This
* functionality seems ok until some nice security API happens.
*/
static int is_sram_locked(void)
{
int type = 0;
if (cpu_is_omap44xx())
/* Not yet supported */
return 0;
if (cpu_is_omap242x())
type = omap_rev() & OMAP2_DEVICETYPE_MASK;
if (type == GP_DEVICE) {
/* RAMFW: R/W access to all initiators for all qualifier sets */
if (cpu_is_omap242x()) {
__raw_writel(0xFF, OMAP24XX_VA_REQINFOPERM0); /* all q-vects */
__raw_writel(0xCFDE, OMAP24XX_VA_READPERM0); /* all i-read */
__raw_writel(0xCFDE, OMAP24XX_VA_WRITEPERM0); /* all i-write */
}
if (cpu_is_omap34xx()) {
__raw_writel(0xFFFF, OMAP34XX_VA_REQINFOPERM0); /* all q-vects */
__raw_writel(0xFFFF, OMAP34XX_VA_READPERM0); /* all i-read */
__raw_writel(0xFFFF, OMAP34XX_VA_WRITEPERM0); /* all i-write */
__raw_writel(0x0, OMAP34XX_VA_ADDR_MATCH2);
__raw_writel(0xFFFFFFFF, OMAP34XX_VA_SMS_RG_ATT0);
}
return 0;
} else
return 1; /* assume locked with no PPA or security driver */
}
/*
* The amount of SRAM depends on the core type.
* Note that we cannot try to test for SRAM here because writes
* to secure SRAM will hang the system. Also the SRAM is not
* yet mapped at this point.
*/
void __init omap_detect_sram(void)
{
unsigned long reserved;
if (cpu_class_is_omap2()) {
if (is_sram_locked()) {
if (cpu_is_omap34xx()) {
omap_sram_base = OMAP3_SRAM_PUB_VA;
omap_sram_start = OMAP3_SRAM_PUB_PA;
omap_sram_size = 0x8000; /* 32K */
} else {
omap_sram_base = OMAP2_SRAM_PUB_VA;
omap_sram_start = OMAP2_SRAM_PUB_PA;
omap_sram_size = 0x800; /* 2K */
}
} else {
if (cpu_is_omap34xx()) {
omap_sram_base = OMAP3_SRAM_VA;
omap_sram_start = OMAP3_SRAM_PA;
omap_sram_size = 0x10000; /* 64K */
} else if (cpu_is_omap44xx()) {
omap_sram_base = OMAP4_SRAM_VA;
omap_sram_start = OMAP4_SRAM_PA;
omap_sram_size = 0x8000; /* 32K */
} else {
omap_sram_base = OMAP2_SRAM_VA;
omap_sram_start = OMAP2_SRAM_PA;
if (cpu_is_omap242x())
omap_sram_size = 0xa0000; /* 640K */
else if (cpu_is_omap243x())
omap_sram_size = 0x10000; /* 64K */
}
}
} else {
omap_sram_base = OMAP1_SRAM_VA;
omap_sram_start = OMAP1_SRAM_PA;
if (cpu_is_omap7xx())
omap_sram_size = 0x32000; /* 200K */
else if (cpu_is_omap15xx())
omap_sram_size = 0x30000; /* 192K */
else if (cpu_is_omap1610() || cpu_is_omap1621() ||
cpu_is_omap1710())
omap_sram_size = 0x4000; /* 16K */
else if (cpu_is_omap1611())
omap_sram_size = 0x3e800; /* 250K */
else {
printk(KERN_ERR "Could not detect SRAM size\n");
omap_sram_size = 0x4000;
}
}
reserved = omapfb_reserve_sram(omap_sram_start, omap_sram_base,
omap_sram_size,
omap_sram_start + SRAM_BOOTLOADER_SZ,
omap_sram_size - SRAM_BOOTLOADER_SZ);
omap_sram_size -= reserved;
omap_sram_ceil = omap_sram_base + omap_sram_size;
}
static struct map_desc omap_sram_io_desc[] __initdata = {
{ /* .length gets filled in at runtime */
.virtual = OMAP1_SRAM_VA,
.pfn = __phys_to_pfn(OMAP1_SRAM_PA),
.type = MT_MEMORY
}
};
/*
* Note that we cannot use ioremap for SRAM, as clock init needs SRAM early.
*/
void __init omap_map_sram(void)
{
unsigned long base;
if (omap_sram_size == 0)
return;
if (cpu_is_omap24xx()) {
omap_sram_io_desc[0].virtual = OMAP2_SRAM_VA;
base = OMAP2_SRAM_PA;
base = ROUND_DOWN(base, PAGE_SIZE);
omap_sram_io_desc[0].pfn = __phys_to_pfn(base);
}
if (cpu_is_omap34xx()) {
omap_sram_io_desc[0].virtual = OMAP3_SRAM_VA;
base = OMAP3_SRAM_PA;
base = ROUND_DOWN(base, PAGE_SIZE);
omap_sram_io_desc[0].pfn = __phys_to_pfn(base);
/*
* SRAM must be marked as non-cached on OMAP3 since the
* CORE DPLL M2 divider change code (in SRAM) runs with the
* SDRAM controller disabled, and if it is marked cached,
* the ARM may attempt to write cache lines back to SDRAM
* which will cause the system to hang.
*/
omap_sram_io_desc[0].type = MT_MEMORY_NONCACHED;
}
if (cpu_is_omap44xx()) {
omap_sram_io_desc[0].virtual = OMAP4_SRAM_VA;
base = OMAP4_SRAM_PA;
base = ROUND_DOWN(base, PAGE_SIZE);
omap_sram_io_desc[0].pfn = __phys_to_pfn(base);
}
omap_sram_io_desc[0].length = 1024 * 1024; /* Use section desc */
iotable_init(omap_sram_io_desc, ARRAY_SIZE(omap_sram_io_desc));
printk(KERN_INFO "SRAM: Mapped pa 0x%08lx to va 0x%08lx size: 0x%lx\n",
__pfn_to_phys(omap_sram_io_desc[0].pfn),
omap_sram_io_desc[0].virtual,
omap_sram_io_desc[0].length);
/*
* Normally devicemaps_init() would flush caches and tlb after
* mdesc->map_io(), but since we're called from map_io(), we
* must do it here.
*/
local_flush_tlb_all();
flush_cache_all();
/*
* Looks like we need to preserve some bootloader code at the
* beginning of SRAM for jumping to flash for reboot to work...
*/
memset((void *)omap_sram_base + SRAM_BOOTLOADER_SZ, 0,
omap_sram_size - SRAM_BOOTLOADER_SZ);
}
void * omap_sram_push(void * start, unsigned long size)
{
if (size > (omap_sram_ceil - (omap_sram_base + SRAM_BOOTLOADER_SZ))) {
printk(KERN_ERR "Not enough space in SRAM\n");
return NULL;
}
omap_sram_ceil -= size;
omap_sram_ceil = ROUND_DOWN(omap_sram_ceil, sizeof(void *));
memcpy((void *)omap_sram_ceil, start, size);
flush_icache_range((unsigned long)start, (unsigned long)(start + size));
return (void *)omap_sram_ceil;
}
#ifdef CONFIG_ARCH_OMAP1
static void (*_omap_sram_reprogram_clock)(u32 dpllctl, u32 ckctl);
void omap_sram_reprogram_clock(u32 dpllctl, u32 ckctl)
{
BUG_ON(!_omap_sram_reprogram_clock);
_omap_sram_reprogram_clock(dpllctl, ckctl);
}
int __init omap1_sram_init(void)
{
_omap_sram_reprogram_clock =
omap_sram_push(omap1_sram_reprogram_clock,
omap1_sram_reprogram_clock_sz);
return 0;
}
#else
#define omap1_sram_init() do {} while (0)
#endif
#if defined(CONFIG_ARCH_OMAP2)
static void (*_omap2_sram_ddr_init)(u32 *slow_dll_ctrl, u32 fast_dll_ctrl,
u32 base_cs, u32 force_unlock);
void omap2_sram_ddr_init(u32 *slow_dll_ctrl, u32 fast_dll_ctrl,
u32 base_cs, u32 force_unlock)
{
BUG_ON(!_omap2_sram_ddr_init);
_omap2_sram_ddr_init(slow_dll_ctrl, fast_dll_ctrl,
base_cs, force_unlock);
}
static void (*_omap2_sram_reprogram_sdrc)(u32 perf_level, u32 dll_val,
u32 mem_type);
void omap2_sram_reprogram_sdrc(u32 perf_level, u32 dll_val, u32 mem_type)
{
BUG_ON(!_omap2_sram_reprogram_sdrc);
_omap2_sram_reprogram_sdrc(perf_level, dll_val, mem_type);
}
static u32 (*_omap2_set_prcm)(u32 dpll_ctrl_val, u32 sdrc_rfr_val, int bypass);
u32 omap2_set_prcm(u32 dpll_ctrl_val, u32 sdrc_rfr_val, int bypass)
{
BUG_ON(!_omap2_set_prcm);
return _omap2_set_prcm(dpll_ctrl_val, sdrc_rfr_val, bypass);
}
#endif
#ifdef CONFIG_ARCH_OMAP2420
int __init omap242x_sram_init(void)
{
_omap2_sram_ddr_init = omap_sram_push(omap242x_sram_ddr_init,
omap242x_sram_ddr_init_sz);
_omap2_sram_reprogram_sdrc = omap_sram_push(omap242x_sram_reprogram_sdrc,
omap242x_sram_reprogram_sdrc_sz);
_omap2_set_prcm = omap_sram_push(omap242x_sram_set_prcm,
omap242x_sram_set_prcm_sz);
return 0;
}
#else
static inline int omap242x_sram_init(void)
{
return 0;
}
#endif
#ifdef CONFIG_ARCH_OMAP2430
int __init omap243x_sram_init(void)
{
_omap2_sram_ddr_init = omap_sram_push(omap243x_sram_ddr_init,
omap243x_sram_ddr_init_sz);
_omap2_sram_reprogram_sdrc = omap_sram_push(omap243x_sram_reprogram_sdrc,
omap243x_sram_reprogram_sdrc_sz);
_omap2_set_prcm = omap_sram_push(omap243x_sram_set_prcm,
omap243x_sram_set_prcm_sz);
return 0;
}
#else
static inline int omap243x_sram_init(void)
{
return 0;
}
#endif
#ifdef CONFIG_ARCH_OMAP3
static u32 (*_omap3_sram_configure_core_dpll)(u32 sdrc_rfr_ctrl,
u32 sdrc_actim_ctrla,
u32 sdrc_actim_ctrlb,
u32 m2, u32 unlock_dll);
u32 omap3_configure_core_dpll(u32 sdrc_rfr_ctrl, u32 sdrc_actim_ctrla,
u32 sdrc_actim_ctrlb, u32 m2, u32 unlock_dll)
{
BUG_ON(!_omap3_sram_configure_core_dpll);
return _omap3_sram_configure_core_dpll(sdrc_rfr_ctrl,
sdrc_actim_ctrla,
sdrc_actim_ctrlb, m2,
unlock_dll);
}
/* REVISIT: Should this be same as omap34xx_sram_init() after off-idle? */
void restore_sram_functions(void)
{
omap_sram_ceil = omap_sram_base + omap_sram_size;
_omap3_sram_configure_core_dpll =
omap_sram_push(omap3_sram_configure_core_dpll,
omap3_sram_configure_core_dpll_sz);
}
int __init omap34xx_sram_init(void)
{
_omap3_sram_configure_core_dpll =
omap_sram_push(omap3_sram_configure_core_dpll,
omap3_sram_configure_core_dpll_sz);
return 0;
}
#else
static inline int omap34xx_sram_init(void)
{
return 0;
}
#endif
int __init omap_sram_init(void)
{
omap_detect_sram();
omap_map_sram();
if (!(cpu_class_is_omap2()))
omap1_sram_init();
else if (cpu_is_omap242x())
omap242x_sram_init();
else if (cpu_is_omap2430())
omap243x_sram_init();
else if (cpu_is_omap34xx())
omap34xx_sram_init();
else if (cpu_is_omap44xx())
omap34xx_sram_init(); /* FIXME: */
return 0;
}
