projects / GitHub / mt8127 / android_kernel_alcatel_ttab.git / blame
| Commit | Line | Data |
|---|---|---|
| 92105bb7 | 1 | /* |
| f30c2269 | 2 | * linux/arch/arm/plat-omap/sram-fn.S |
| 92105bb7 TL |
3 | * |
| 4 | * Functions that need to be run in internal SRAM | |
| 5 | * | |
| 6 | * This program is free software; you can redistribute it and/or modify | |
| 7 | * it under the terms of the GNU General Public License version 2 as | |
| 8 | * published by the Free Software Foundation. | |
| 9 | */ | |
| 10 | ||
| 92105bb7 TL |
11 | #include <linux/linkage.h> |
| 12 | #include <asm/assembler.h> | |
| 13 | #include <asm/arch/io.h> | |
| 0a5709b2 | 14 | #include <asm/hardware.h> |
| 92105bb7 TL |
15 | |
| 16 | .text | |
| 17 | ||
| 18 | /* | |
| 19 | * Reprograms ULPD and CKCTL. | |
| 20 | */ | |
| 21 | ENTRY(sram_reprogram_clock) | |
| 22 | stmfd sp!, {r0 - r12, lr} @ save registers on stack | |
| 23 | ||
| 24 | mov r2, #IO_ADDRESS(DPLL_CTL) & 0xff000000 | |
| 25 | orr r2, r2, #IO_ADDRESS(DPLL_CTL) & 0x00ff0000 | |
| 26 | orr r2, r2, #IO_ADDRESS(DPLL_CTL) & 0x0000ff00 | |
| 27 | ||
| 28 | mov r3, #IO_ADDRESS(ARM_CKCTL) & 0xff000000 | |
| 29 | orr r3, r3, #IO_ADDRESS(ARM_CKCTL) & 0x00ff0000 | |
| 30 | orr r3, r3, #IO_ADDRESS(ARM_CKCTL) & 0x0000ff00 | |
| 31 | ||
| 32 | tst r0, #1 << 4 @ want lock mode? | |
| 33 | beq newck @ nope | |
| 34 | bic r0, r0, #1 << 4 @ else clear lock bit | |
| 35 | strh r0, [r2] @ set dpll into bypass mode | |
| 36 | orr r0, r0, #1 << 4 @ set lock bit again | |
| 37 | ||
| 38 | newck: | |
| 39 | strh r1, [r3] @ write new ckctl value | |
| 40 | strh r0, [r2] @ write new dpll value | |
| 41 | ||
| 42 | mov r4, #0x0700 @ let the clocks settle | |
| 43 | orr r4, r4, #0x00ff | |
| 44 | delay: sub r4, r4, #1 | |
| 45 | cmp r4, #0 | |
| 46 | bne delay | |
| 47 | ||
| 48 | lock: ldrh r4, [r2], #0 @ read back dpll value | |
| 49 | tst r0, #1 << 4 @ want lock mode? | |
| 50 | beq out @ nope | |
| 51 | tst r4, #1 << 0 @ dpll rate locked? | |
| 52 | beq lock @ try again | |
| 53 | ||
| 54 | out: | |
| 55 | ldmfd sp!, {r0 - r12, pc} @ restore regs and return | |
| 56 | ENTRY(sram_reprogram_clock_sz) | |
| 57 | .word . - sram_reprogram_clock |