projects / mirror_ubuntu-artful-kernel.git / blame
| Commit | Line | Data |
|---|---|---|
| 73feb5c0 MH |
1 | /* |
| 2 | * arch/blackfin/mach-common/clocks-init.c - reprogram clocks / memory | |
| 3 | * | |
| 4 | * Copyright 2004-2008 Analog Devices Inc. | |
| 5 | * | |
| 6 | * Licensed under the GPL-2 or later. | |
| 7 | */ | |
| 8 | ||
| 9 | #include <linux/linkage.h> | |
| 10 | #include <linux/init.h> | |
| 11 | #include <asm/blackfin.h> | |
| 12 | ||
| 13 | #include <asm/dma.h> | |
| 14 | #include <asm/clocks.h> | |
| 15 | #include <asm/mem_init.h> | |
| 761ec44a | 16 | #include <asm/dpmc.h> |
| 73feb5c0 | 17 | |
| 33169312 | 18 | #define SDGCTL_WIDTH (1 << 31) /* SDRAM external data path width */ |
| 73feb5c0 MH |
19 | #define PLL_CTL_VAL \ |
| 20 | (((CONFIG_VCO_MULT & 63) << 9) | CLKIN_HALF | \ | |
| 7acab7a9 | 21 | (PLL_BYPASS << 8) | (ANOMALY_05000305 ? 0 : 0x8000)) |
| 73feb5c0 MH |
22 | |
| 23 | __attribute__((l1_text)) | |
| 24 | static void do_sync(void) | |
| 25 | { | |
| 26 | __builtin_bfin_ssync(); | |
| 27 | } | |
| 28 | ||
| 29 | __attribute__((l1_text)) | |
| 30 | void init_clocks(void) | |
| 31 | { | |
| 32 | /* Kill any active DMAs as they may trigger external memory accesses | |
| 33 | * in the middle of reprogramming things, and that'll screw us up. | |
| 34 | * For example, any automatic DMAs left by U-Boot for splash screens. | |
| 35 | */ | |
| 36 | size_t i; | |
| 211daf9d | 37 | for (i = 0; i < MAX_DMA_CHANNELS; ++i) { |
| 73feb5c0 MH |
38 | struct dma_register *dma = dma_io_base_addr[i]; |
| 39 | dma->cfg = 0; | |
| 40 | } | |
| 41 | ||
| 42 | do_sync(); | |
| 43 | ||
| 44 | #ifdef SIC_IWR0 | |
| 45 | bfin_write_SIC_IWR0(IWR_ENABLE(0)); | |
| 46 | # ifdef SIC_IWR1 | |
| 47 | /* BF52x system reset does not properly reset SIC_IWR1 which | |
| 48 | * will screw up the bootrom as it relies on MDMA0/1 waking it | |
| 49 | * up from IDLE instructions. See this report for more info: | |
| 50 | * http://blackfin.uclinux.org/gf/tracker/4323 | |
| 51 | */ | |
| 52 | if (ANOMALY_05000435) | |
| 53 | bfin_write_SIC_IWR1(IWR_ENABLE(10) | IWR_ENABLE(11)); | |
| 54 | else | |
| 55 | bfin_write_SIC_IWR1(IWR_DISABLE_ALL); | |
| 56 | # endif | |
| 57 | # ifdef SIC_IWR2 | |
| 58 | bfin_write_SIC_IWR2(IWR_DISABLE_ALL); | |
| 59 | # endif | |
| 60 | #else | |
| 61 | bfin_write_SIC_IWR(IWR_ENABLE(0)); | |
| 62 | #endif | |
| 63 | do_sync(); | |
| 64 | #ifdef EBIU_SDGCTL | |
| 65 | bfin_write_EBIU_SDGCTL(bfin_read_EBIU_SDGCTL() | SRFS); | |
| 66 | do_sync(); | |
| 67 | #endif | |
| 68 | ||
| 69 | #ifdef CLKBUFOE | |
| 70 | bfin_write16(VR_CTL, bfin_read_VR_CTL() | CLKBUFOE); | |
| 71 | do_sync(); | |
| 72 | __asm__ __volatile__("IDLE;"); | |
| 73 | #endif | |
| 74 | bfin_write_PLL_LOCKCNT(0x300); | |
| 75 | do_sync(); | |
| 97b070c8 | 76 | /* We always write PLL_CTL thus avoiding Anomaly 05000242 */ |
| 73feb5c0 MH |
77 | bfin_write16(PLL_CTL, PLL_CTL_VAL); |
| 78 | __asm__ __volatile__("IDLE;"); | |
| 79 | bfin_write_PLL_DIV(CONFIG_CCLK_ACT_DIV | CONFIG_SCLK_DIV); | |
| 80 | #ifdef EBIU_SDGCTL | |
| 81 | bfin_write_EBIU_SDRRC(mem_SDRRC); | |
| 33169312 | 82 | bfin_write_EBIU_SDGCTL((bfin_read_EBIU_SDGCTL() & SDGCTL_WIDTH) | mem_SDGCTL); |
| 73feb5c0 MH |
83 | #else |
| 84 | bfin_write_EBIU_RSTCTL(bfin_read_EBIU_RSTCTL() & ~(SRREQ)); | |
| 85 | do_sync(); | |
| 86 | bfin_write_EBIU_RSTCTL(bfin_read_EBIU_RSTCTL() | 0x1); | |
| 87 | bfin_write_EBIU_DDRCTL0(mem_DDRCTL0); | |
| 88 | bfin_write_EBIU_DDRCTL1(mem_DDRCTL1); | |
| 89 | bfin_write_EBIU_DDRCTL2(mem_DDRCTL2); | |
| 90 | #ifdef CONFIG_MEM_EBIU_DDRQUE | |
| 91 | bfin_write_EBIU_DDRQUE(CONFIG_MEM_EBIU_DDRQUE); | |
| 92 | #endif | |
| 93 | #endif | |
| 94 | do_sync(); | |
| 95 | bfin_read16(0); | |
| 96 | } |