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author | Takashi Iwai <tiwai@suse.de> | 2009-11-01 11:11:07 +0100 |
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committer | Takashi Iwai <tiwai@suse.de> | 2009-11-01 11:11:07 +0100 |
commit | e87a3dd33eab30b4db539500064a9584867e4f2c (patch) | |
tree | 2f7ad16e46ae30518ff63bb5391b63f7f7cc74dd /arch/arm/mach-omap2/gpmc.c | |
parent | b14f5de731ae657d498d18d713c6431bfbeefb4b (diff) | |
parent | 3d00941371a765779c4e3509214c7e5793cce1fe (diff) | |
download | blackbird-op-linux-e87a3dd33eab30b4db539500064a9584867e4f2c.tar.gz blackbird-op-linux-e87a3dd33eab30b4db539500064a9584867e4f2c.zip |
Merge branch 'fix/misc' into topic/misc
Diffstat (limited to 'arch/arm/mach-omap2/gpmc.c')
-rw-r--r-- | arch/arm/mach-omap2/gpmc.c | 63 |
1 files changed, 62 insertions, 1 deletions
diff --git a/arch/arm/mach-omap2/gpmc.c b/arch/arm/mach-omap2/gpmc.c index f91934b2b092..15876828db23 100644 --- a/arch/arm/mach-omap2/gpmc.c +++ b/arch/arm/mach-omap2/gpmc.c @@ -57,6 +57,11 @@ #define GPMC_CHUNK_SHIFT 24 /* 16 MB */ #define GPMC_SECTION_SHIFT 28 /* 128 MB */ +#define PREFETCH_FIFOTHRESHOLD (0x40 << 8) +#define CS_NUM_SHIFT 24 +#define ENABLE_PREFETCH (0x1 << 7) +#define DMA_MPU_MODE 2 + static struct resource gpmc_mem_root; static struct resource gpmc_cs_mem[GPMC_CS_NUM]; static DEFINE_SPINLOCK(gpmc_mem_lock); @@ -386,6 +391,63 @@ void gpmc_cs_free(int cs) } EXPORT_SYMBOL(gpmc_cs_free); +/** + * gpmc_prefetch_enable - configures and starts prefetch transfer + * @cs: nand cs (chip select) number + * @dma_mode: dma mode enable (1) or disable (0) + * @u32_count: number of bytes to be transferred + * @is_write: prefetch read(0) or write post(1) mode + */ +int gpmc_prefetch_enable(int cs, int dma_mode, + unsigned int u32_count, int is_write) +{ + uint32_t prefetch_config1; + + if (!(gpmc_read_reg(GPMC_PREFETCH_CONTROL))) { + /* Set the amount of bytes to be prefetched */ + gpmc_write_reg(GPMC_PREFETCH_CONFIG2, u32_count); + + /* Set dma/mpu mode, the prefetch read / post write and + * enable the engine. Set which cs is has requested for. + */ + prefetch_config1 = ((cs << CS_NUM_SHIFT) | + PREFETCH_FIFOTHRESHOLD | + ENABLE_PREFETCH | + (dma_mode << DMA_MPU_MODE) | + (0x1 & is_write)); + gpmc_write_reg(GPMC_PREFETCH_CONFIG1, prefetch_config1); + } else { + return -EBUSY; + } + /* Start the prefetch engine */ + gpmc_write_reg(GPMC_PREFETCH_CONTROL, 0x1); + + return 0; +} +EXPORT_SYMBOL(gpmc_prefetch_enable); + +/** + * gpmc_prefetch_reset - disables and stops the prefetch engine + */ +void gpmc_prefetch_reset(void) +{ + /* Stop the PFPW engine */ + gpmc_write_reg(GPMC_PREFETCH_CONTROL, 0x0); + + /* Reset/disable the PFPW engine */ + gpmc_write_reg(GPMC_PREFETCH_CONFIG1, 0x0); +} +EXPORT_SYMBOL(gpmc_prefetch_reset); + +/** + * gpmc_prefetch_status - reads prefetch status of engine + */ +int gpmc_prefetch_status(void) +{ + return gpmc_read_reg(GPMC_PREFETCH_STATUS); +} +EXPORT_SYMBOL(gpmc_prefetch_status); + static void __init gpmc_mem_init(void) { int cs; @@ -452,6 +514,5 @@ void __init gpmc_init(void) l &= 0x03 << 3; l |= (0x02 << 3) | (1 << 0); gpmc_write_reg(GPMC_SYSCONFIG, l); - gpmc_mem_init(); } |