projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| ef8028a7 | 1 | /* |
| 1da177e4 LT |
2 | * Rescue code to be prepended on a kimage and copied to the |
| 3 | * rescue serial port. | |
| 4 | * This is called from the rescue code, it will copy received data to | |
| 5 | * 4004000 and after a timeout jump to it. | |
| 6 | */ | |
| 7 | ||
| 1da177e4 | 8 | #define ASSEMBLER_MACROS_ONLY |
| 556dcee7 | 9 | #include <arch/sv_addr_ag.h> |
| 1da177e4 LT |
10 | |
| 11 | #define CODE_START 0x40004000 | |
| 12 | #define CODE_LENGTH 784 | |
| 13 | #define TIMEOUT_VALUE 1000 | |
| ef8028a7 JN |
14 | |
| 15 | ||
| 1da177e4 LT |
16 | #ifdef CONFIG_ETRAX_RESCUE_SER0 |
| 17 | #define SERXOFF R_SERIAL0_XOFF | |
| 18 | #define SERBAUD R_SERIAL0_BAUD | |
| 19 | #define SERRECC R_SERIAL0_REC_CTRL | |
| 20 | #define SERRDAT R_SERIAL0_REC_DATA | |
| 21 | #define SERSTAT R_SERIAL0_STATUS | |
| 22 | #endif | |
| 23 | #ifdef CONFIG_ETRAX_RESCUE_SER1 | |
| 24 | #define SERXOFF R_SERIAL1_XOFF | |
| 25 | #define SERBAUD R_SERIAL1_BAUD | |
| 26 | #define SERRECC R_SERIAL1_REC_CTRL | |
| 27 | #define SERRDAT R_SERIAL1_REC_DATA | |
| 28 | #define SERSTAT R_SERIAL1_STATUS | |
| 29 | #endif | |
| 30 | #ifdef CONFIG_ETRAX_RESCUE_SER2 | |
| 31 | #define SERXOFF R_SERIAL2_XOFF | |
| 32 | #define SERBAUD R_SERIAL2_BAUD | |
| 33 | #define SERRECC R_SERIAL2_REC_CTRL | |
| 34 | #define SERRDAT R_SERIAL2_REC_DATA | |
| 35 | #define SERSTAT R_SERIAL2_STATUS | |
| ef8028a7 | 36 | #endif |
| 1da177e4 LT |
37 | #ifdef CONFIG_ETRAX_RESCUE_SER3 |
| 38 | #define SERXOFF R_SERIAL3_XOFF | |
| 39 | #define SERBAUD R_SERIAL3_BAUD | |
| 40 | #define SERRECC R_SERIAL3_REC_CTRL | |
| 41 | #define SERRDAT R_SERIAL3_REC_DATA | |
| 42 | #define SERSTAT R_SERIAL3_STATUS | |
| 43 | #endif | |
| 44 | ||
| 45 | .text | |
| 46 | ;; This is the entry point of the rescue code | |
| 47 | ;; 0x80000000 if loaded in flash (as it should be) | |
| 48 | ;; since etrax actually starts at address 2 when booting from flash, we | |
| 49 | ;; put a nop (2 bytes) here first so we dont accidentally skip the di | |
| ef8028a7 JN |
50 | |
| 51 | nop | |
| 1da177e4 | 52 | di |
| 1da177e4 LT |
53 | ;; setup port PA and PB default initial directions and data |
| 54 | ;; (so we can flash LEDs, and so that DTR and others are set) | |
| ef8028a7 | 55 | |
| 1da177e4 LT |
56 | move.b CONFIG_ETRAX_DEF_R_PORT_PA_DIR, $r0 |
| 57 | move.b $r0, [R_PORT_PA_DIR] | |
| 58 | move.b CONFIG_ETRAX_DEF_R_PORT_PA_DATA, $r0 | |
| 59 | move.b $r0, [R_PORT_PA_DATA] | |
| ef8028a7 | 60 | |
| 1da177e4 LT |
61 | move.b CONFIG_ETRAX_DEF_R_PORT_PB_DIR, $r0 |
| 62 | move.b $r0, [R_PORT_PB_DIR] | |
| 63 | move.b CONFIG_ETRAX_DEF_R_PORT_PB_DATA, $r0 | |
| 64 | move.b $r0, [R_PORT_PB_DATA] | |
| ef8028a7 | 65 | |
| 1da177e4 LT |
66 | ;; We need to setup the bus registers before we start using the DRAM |
| 67 | #include "../../lib/dram_init.S" | |
| ef8028a7 | 68 | |
| 1da177e4 LT |
69 | ;; Setup the stack to a suitably high address. |
| 70 | ;; We assume 8 MB is the minimum DRAM in an eLinux | |
| 71 | ;; product and put the sp at the top for now. | |
| 72 | ||
| 73 | move.d 0x40800000, $sp | |
| ef8028a7 | 74 | |
| 1da177e4 | 75 | ;; setup the serial port at 115200 baud |
| ef8028a7 | 76 | |
| 1da177e4 | 77 | moveq 0, $r0 |
| ef8028a7 | 78 | move.d $r0, [SERXOFF] |
| 1da177e4 LT |
79 | |
| 80 | move.b 0x99, $r0 | |
| ef8028a7 JN |
81 | move.b $r0, [SERBAUD] ; 115.2kbaud for both transmit |
| 82 | ; and receive | |
| 1da177e4 LT |
83 | |
| 84 | move.b 0x40, $r0 ; rec enable | |
| ef8028a7 | 85 | move.b $r0, [SERRECC] |
| 1da177e4 LT |
86 | |
| 87 | ||
| ef8028a7 JN |
88 | moveq 0, $r1 ; "timer" to clock out a LED red flash |
| 89 | move.d CODE_START, $r3 ; destination counter | |
| 1da177e4 LT |
90 | move.d CODE_LENGTH, $r4 ; length |
| 91 | move.d TIMEOUT_VALUE, $r5 ; "timeout" until jump | |
| 92 | ||
| 93 | wait_ser: | |
| 94 | addq 1, $r1 | |
| ef8028a7 JN |
95 | subq 1, $r5 ; decrease timeout |
| 96 | beq jump_start ; timed out | |
| 1da177e4 LT |
97 | nop |
| 98 | #ifndef CONFIG_ETRAX_NO_LEDS | |
| 99 | #ifdef CONFIG_ETRAX_PA_LEDS | |
| 100 | move.b CONFIG_ETRAX_DEF_R_PORT_PA_DATA, $r2 | |
| 101 | #endif | |
| 102 | #ifdef CONFIG_ETRAX_PB_LEDS | |
| 103 | move.b CONFIG_ETRAX_DEF_R_PORT_PB_DATA, $r2 | |
| 104 | #endif | |
| 105 | move.d (1 << CONFIG_ETRAX_LED1R) | (1 << CONFIG_ETRAX_LED2R), $r0 | |
| 106 | btstq 16, $r1 | |
| 107 | bpl 1f | |
| 108 | nop | |
| 109 | or.d $r0, $r2 ; set bit | |
| 110 | ba 2f | |
| 111 | nop | |
| ef8028a7 | 112 | 1: not $r0 ; clear bit |
| 1da177e4 | 113 | and.d $r0, $r2 |
| ef8028a7 | 114 | 2: |
| 1da177e4 LT |
115 | #ifdef CONFIG_ETRAX_PA_LEDS |
| 116 | move.b $r2, [R_PORT_PA_DATA] | |
| ef8028a7 | 117 | #endif |
| 1da177e4 LT |
118 | #ifdef CONFIG_ETRAX_PB_LEDS |
| 119 | move.b $r2, [R_PORT_PB_DATA] | |
| 120 | #endif | |
| 121 | #endif | |
| ef8028a7 | 122 | |
| 1da177e4 | 123 | ;; check if we got something on the serial port |
| ef8028a7 | 124 | |
| 1da177e4 | 125 | move.b [SERSTAT], $r0 |
| ef8028a7 | 126 | btstq 0, $r0 ; data_avail |
| 1da177e4 LT |
127 | bpl wait_ser |
| 128 | nop | |
| 129 | ||
| 130 | ;; got something - copy the byte and loop | |
| 131 | ||
| 132 | move.b [SERRDAT], $r0 | |
| 133 | move.b $r0, [$r3+] | |
| 134 | move.d TIMEOUT_VALUE, $r5 ; reset "timeout" | |
| ef8028a7 | 135 | subq 1, $r4 ; decrease length |
| 1da177e4 LT |
136 | bne wait_ser |
| 137 | nop | |
| 138 | jump_start: | |
| 139 | ;; jump into downloaded code | |
| 140 | ||
| 141 | jump CODE_START |