1 /* 2 * OMAP SRAM detection and management 3 * 4 * Copyright (C) 2005 Nokia Corporation 5 * Written by Tony Lindgren <tony@atomide.com> 6 * 7 * This program is free software; you can redistribute it and/or modify 8 * it under the terms of the GNU General Public License version 2 as 9 * published by the Free Software Foundation. 10 */ 11 12 #include <linux/module.h> 13 #include <linux/kernel.h> 14 #include <linux/init.h> 15 #include <linux/io.h> 16 17 #include <asm/fncpy.h> 18 #include <asm/tlb.h> 19 #include <asm/cacheflush.h> 20 21 #include <asm/mach/map.h> 22 23 #include "soc.h" 24 #include "sram.h" 25 26 #define OMAP1_SRAM_PA 0x20000000 27 #define SRAM_BOOTLOADER_SZ 0x80 28 29 /* 30 * The amount of SRAM depends on the core type. 31 * Note that we cannot try to test for SRAM here because writes 32 * to secure SRAM will hang the system. Also the SRAM is not 33 * yet mapped at this point. 34 */ 35 static void __init omap_detect_and_map_sram(void) 36 { 37 unsigned long omap_sram_skip = SRAM_BOOTLOADER_SZ; 38 unsigned long omap_sram_start = OMAP1_SRAM_PA; 39 unsigned long omap_sram_size; 40 41 if (cpu_is_omap7xx()) 42 omap_sram_size = 0x32000; /* 200K */ 43 else if (cpu_is_omap15xx()) 44 omap_sram_size = 0x30000; /* 192K */ 45 else if (cpu_is_omap1610() || cpu_is_omap1611() || 46 cpu_is_omap1621() || cpu_is_omap1710()) 47 omap_sram_size = 0x4000; /* 16K */ 48 else { 49 pr_err("Could not detect SRAM size\n"); 50 omap_sram_size = 0x4000; 51 } 52 53 omap_map_sram(omap_sram_start, omap_sram_size, 54 omap_sram_skip, 1); 55 } 56 57 static void (*_omap_sram_reprogram_clock)(u32 dpllctl, u32 ckctl); 58 59 void omap_sram_reprogram_clock(u32 dpllctl, u32 ckctl) 60 { 61 BUG_ON(!_omap_sram_reprogram_clock); 62 /* On 730, bit 13 must always be 1 */ 63 if (cpu_is_omap7xx()) 64 ckctl |= 0x2000; 65 _omap_sram_reprogram_clock(dpllctl, ckctl); 66 } 67 68 int __init omap_sram_init(void) 69 { 70 omap_detect_and_map_sram(); 71 _omap_sram_reprogram_clock = 72 omap_sram_push(omap1_sram_reprogram_clock, 73 omap1_sram_reprogram_clock_sz); 74 75 return 0; 76 } 77