1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * OMAP SRAM detection and management 4 * 5 * Copyright (C) 2005 Nokia Corporation 6 * Written by Tony Lindgren <tony@atomide.com> 7 */ 8 9 #include <linux/module.h> 10 #include <linux/kernel.h> 11 #include <linux/init.h> 12 #include <linux/io.h> 13 14 #include <asm/fncpy.h> 15 #include <asm/tlb.h> 16 #include <asm/cacheflush.h> 17 18 #include <asm/mach/map.h> 19 20 #include "soc.h" 21 #include "sram.h" 22 23 #define OMAP1_SRAM_PA 0x20000000 24 #define SRAM_BOOTLOADER_SZ 0x80 25 26 /* 27 * The amount of SRAM depends on the core type. 28 * Note that we cannot try to test for SRAM here because writes 29 * to secure SRAM will hang the system. Also the SRAM is not 30 * yet mapped at this point. 31 */ 32 static void __init omap_detect_and_map_sram(void) 33 { 34 unsigned long omap_sram_skip = SRAM_BOOTLOADER_SZ; 35 unsigned long omap_sram_start = OMAP1_SRAM_PA; 36 unsigned long omap_sram_size; 37 38 if (cpu_is_omap7xx()) 39 omap_sram_size = 0x32000; /* 200K */ 40 else if (cpu_is_omap15xx()) 41 omap_sram_size = 0x30000; /* 192K */ 42 else if (cpu_is_omap1610() || cpu_is_omap1611() || 43 cpu_is_omap1621() || cpu_is_omap1710()) 44 omap_sram_size = 0x4000; /* 16K */ 45 else { 46 pr_err("Could not detect SRAM size\n"); 47 omap_sram_size = 0x4000; 48 } 49 50 omap_map_sram(omap_sram_start, omap_sram_size, 51 omap_sram_skip, 1); 52 } 53 54 static void (*_omap_sram_reprogram_clock)(u32 dpllctl, u32 ckctl); 55 56 void omap_sram_reprogram_clock(u32 dpllctl, u32 ckctl) 57 { 58 BUG_ON(!_omap_sram_reprogram_clock); 59 /* On 730, bit 13 must always be 1 */ 60 if (cpu_is_omap7xx()) 61 ckctl |= 0x2000; 62 _omap_sram_reprogram_clock(dpllctl, ckctl); 63 } 64 65 int __init omap_sram_init(void) 66 { 67 omap_detect_and_map_sram(); 68 _omap_sram_reprogram_clock = 69 omap_sram_push(omap1_sram_reprogram_clock, 70 omap1_sram_reprogram_clock_sz); 71 72 return 0; 73 } 74