linux-2.6.15.6

				/*				 * linux/arch/arm/plat-omap/sram.c				 *				 * OMAP SRAM detection and management				 *				 * Copyright (C) 2005 Nokia Corporation				 * Written by 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 				#include 				#include 				#include 								#include 				#include 				#include 								#include 								#define OMAP1_SRAM_PA		0x20000000				#define OMAP1_SRAM_VA		0xd0000000				#define OMAP2_SRAM_PA		0x40200000				#define OMAP2_SRAM_VA		0xd0000000								#define SRAM_BOOTLOADER_SZ	0x80								static unsigned long omap_sram_base;				static unsigned long omap_sram_size;				static unsigned long omap_sram_ceil;								/*				 * 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)				{					if (!cpu_is_omap24xx())						omap_sram_base = OMAP1_SRAM_VA;					else						omap_sram_base = OMAP2_SRAM_VA;									if (cpu_is_omap730())						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 if (cpu_is_omap2420())						omap_sram_size = 0xa0014;	/* 640K */					else {						printk(KERN_ERR "Could not detect SRAM size\n");						omap_sram_size = 0x4000;					}									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_DEVICE					}				};								/*				 * In order to use last 2kB of SRAM on 1611b, we must round the size				 * up to multiple of PAGE_SIZE. We cannot use ioremap for SRAM, as				 * clock init needs SRAM early.				 */				void __init omap_map_sram(void)				{					if (omap_sram_size == 0)						return;									if (cpu_is_omap24xx()) {						omap_sram_io_desc[0].virtual = OMAP2_SRAM_VA;						omap_sram_io_desc[0].pfn = __phys_to_pfn(OMAP2_SRAM_PA);					}									omap_sram_io_desc[0].length = (omap_sram_size + PAGE_SIZE-1)/PAGE_SIZE;					omap_sram_io_desc[0].length *= PAGE_SIZE;					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",					       omap_sram_io_desc[0].pfn, omap_sram_io_desc[0].virtual,					       omap_sram_io_desc[0].length);									/*					 * 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 &= ~0x3;					memcpy((void *)omap_sram_ceil, start, size);									return (void *)omap_sram_ceil;				}								static void omap_sram_error(void)				{					panic("Uninitialized SRAM function\n");				}								#ifdef CONFIG_ARCH_OMAP1								static void (*_omap_sram_reprogram_clock)(u32 dpllctl, u32 ckctl);								void omap_sram_reprogram_clock(u32 dpllctl, u32 ckctl)				{					if (!_omap_sram_reprogram_clock)						omap_sram_error();									return _omap_sram_reprogram_clock(dpllctl, ckctl);				}								int __init omap1_sram_init(void)				{					_omap_sram_reprogram_clock = omap_sram_push(sram_reprogram_clock,										    sram_reprogram_clock_sz);									return 0;				}								#else				#define omap1_sram_init()	do {} while (0)				#endif								#ifdef 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)				{					if (!_omap2_sram_ddr_init)						omap_sram_error();									return _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)				{					if (!_omap2_sram_reprogram_sdrc)						omap_sram_error();									return _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)				{					if (!_omap2_set_prcm)						omap_sram_error();									return _omap2_set_prcm(dpll_ctrl_val, sdrc_rfr_val, bypass);				}								int __init omap2_sram_init(void)				{					_omap2_sram_ddr_init = omap_sram_push(sram_ddr_init, sram_ddr_init_sz);									_omap2_sram_reprogram_sdrc = omap_sram_push(sram_reprogram_sdrc,										    sram_reprogram_sdrc_sz);					_omap2_set_prcm = omap_sram_push(sram_set_prcm, sram_set_prcm_sz);									return 0;				}				#else				#define omap2_sram_init()	do {} while (0)				#endif								int __init omap_sram_init(void)				{					omap_detect_sram();					omap_map_sram();									if (!cpu_is_omap24xx())						omap1_sram_init();					else						omap2_sram_init();									return 0;				}