1 /* 2 * arch/arm/mach-tegra/io.c 3 * 4 * Copyright (C) 2010 Google, Inc. 5 * 6 * Author: 7 * Colin Cross <ccross@google.com> 8 * Erik Gilling <konkers@google.com> 9 * 10 * This software is licensed under the terms of the GNU General Public 11 * License version 2, as published by the Free Software Foundation, and 12 * may be copied, distributed, and modified under those terms. 13 * 14 * This program is distributed in the hope that it will be useful, 15 * but WITHOUT ANY WARRANTY; without even the implied warranty of 16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 17 * GNU General Public License for more details. 18 * 19 */ 20 21 #include <linux/kernel.h> 22 #include <linux/module.h> 23 #include <linux/init.h> 24 #include <linux/mm.h> 25 #include <linux/io.h> 26 27 #include <mach/hardware.h> 28 #include <asm/page.h> 29 #include <asm/mach/map.h> 30 31 #include "board.h" 32 33 static struct map_desc tegra_io_desc[] __initdata = { 34 { 35 .virtual = IO_PPSB_VIRT, 36 .pfn = __phys_to_pfn(IO_PPSB_PHYS), 37 .length = IO_PPSB_SIZE, 38 .type = MT_DEVICE, 39 }, 40 { 41 .virtual = IO_APB_VIRT, 42 .pfn = __phys_to_pfn(IO_APB_PHYS), 43 .length = IO_APB_SIZE, 44 .type = MT_DEVICE, 45 }, 46 { 47 .virtual = IO_CPU_VIRT, 48 .pfn = __phys_to_pfn(IO_CPU_PHYS), 49 .length = IO_CPU_SIZE, 50 .type = MT_DEVICE, 51 }, 52 { 53 .virtual = IO_IRAM_VIRT, 54 .pfn = __phys_to_pfn(IO_IRAM_PHYS), 55 .length = IO_IRAM_SIZE, 56 .type = MT_DEVICE, 57 }, 58 }; 59 60 void __init tegra_map_common_io(void) 61 { 62 iotable_init(tegra_io_desc, ARRAY_SIZE(tegra_io_desc)); 63 } 64 65 /* 66 * Intercept ioremap() requests for addresses in our fixed mapping regions. 67 */ 68 void __iomem *tegra_ioremap(unsigned long p, size_t size, unsigned int type) 69 { 70 void __iomem *v = IO_ADDRESS(p); 71 if (v == NULL) 72 v = __arm_ioremap(p, size, type); 73 return v; 74 } 75 EXPORT_SYMBOL(tegra_ioremap); 76 77 void tegra_iounmap(volatile void __iomem *addr) 78 { 79 unsigned long virt = (unsigned long)addr; 80 81 if (virt >= VMALLOC_START && virt < VMALLOC_END) 82 __iounmap(addr); 83 } 84 EXPORT_SYMBOL(tegra_iounmap); 85