1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * linux/arch/arm/mach-omap1/io.c 4 * 5 * OMAP1 I/O mapping code 6 */ 7 8 #include <linux/module.h> 9 #include <linux/kernel.h> 10 #include <linux/init.h> 11 #include <linux/io.h> 12 #include <linux/omap-dma.h> 13 14 #include <asm/tlb.h> 15 #include <asm/mach/map.h> 16 17 #include "tc.h" 18 #include "iomap.h" 19 #include "common.h" 20 21 /* 22 * The machine specific code may provide the extra mapping besides the 23 * default mapping provided here. 24 */ 25 static struct map_desc omap1_io_desc[] __initdata = { 26 { 27 .virtual = OMAP1_IO_VIRT, 28 .pfn = __phys_to_pfn(OMAP1_IO_PHYS), 29 .length = OMAP1_IO_SIZE, 30 .type = MT_DEVICE 31 }, { 32 .virtual = OMAP1_DSP_BASE, 33 .pfn = __phys_to_pfn(OMAP1_DSP_START), 34 .length = OMAP1_DSP_SIZE, 35 .type = MT_DEVICE 36 }, { 37 .virtual = OMAP1_DSPREG_BASE, 38 .pfn = __phys_to_pfn(OMAP1_DSPREG_START), 39 .length = OMAP1_DSPREG_SIZE, 40 .type = MT_DEVICE 41 } 42 }; 43 44 /* 45 * Maps common IO regions for omap1 46 */ 47 void __init omap1_map_io(void) 48 { 49 iotable_init(omap1_io_desc, ARRAY_SIZE(omap1_io_desc)); 50 } 51 52 /* 53 * Common low-level hardware init for omap1. 54 */ 55 void __init omap1_init_early(void) 56 { 57 omap_check_revision(); 58 59 /* REVISIT: Refer to OMAP5910 Errata, Advisory SYS_1: "Timeout Abort 60 * on a Posted Write in the TIPB Bridge". 61 */ 62 omap_writew(0x0, MPU_PUBLIC_TIPB_CNTL); 63 omap_writew(0x0, MPU_PRIVATE_TIPB_CNTL); 64 } 65 66 void __init omap1_init_late(void) 67 { 68 omap_serial_wakeup_init(); 69 } 70 71 /* 72 * NOTE: Please use ioremap + __raw_read/write where possible instead of these 73 */ 74 75 u8 omap_readb(u32 pa) 76 { 77 return __raw_readb(OMAP1_IO_ADDRESS(pa)); 78 } 79 EXPORT_SYMBOL(omap_readb); 80 81 u16 omap_readw(u32 pa) 82 { 83 return __raw_readw(OMAP1_IO_ADDRESS(pa)); 84 } 85 EXPORT_SYMBOL(omap_readw); 86 87 u32 omap_readl(u32 pa) 88 { 89 return __raw_readl(OMAP1_IO_ADDRESS(pa)); 90 } 91 EXPORT_SYMBOL(omap_readl); 92 93 void omap_writeb(u8 v, u32 pa) 94 { 95 __raw_writeb(v, OMAP1_IO_ADDRESS(pa)); 96 } 97 EXPORT_SYMBOL(omap_writeb); 98 99 void omap_writew(u16 v, u32 pa) 100 { 101 __raw_writew(v, OMAP1_IO_ADDRESS(pa)); 102 } 103 EXPORT_SYMBOL(omap_writew); 104 105 void omap_writel(u32 v, u32 pa) 106 { 107 __raw_writel(v, OMAP1_IO_ADDRESS(pa)); 108 } 109 EXPORT_SYMBOL(omap_writel); 110