diff options
author | CK Hu <ck.hu@mediatek.com> | 2020-08-25 14:29:20 +0800 |
---|---|---|
committer | Hung-Te Lin <hungte@chromium.org> | 2020-09-08 02:14:49 +0000 |
commit | 80518ee5124209adbe42c2613900b670695a5763 (patch) | |
tree | fbee1323451f75fffbc3d7986e5d3f35ffa8ff5d /src/soc/mediatek | |
parent | 2ee5dcb153d85b9823e1cc8f50005c614fbbe343 (diff) | |
download | coreboot-80518ee5124209adbe42c2613900b670695a5763.tar.xz |
soc/mediatek/mt8192: Add SPI flash controller DMA read function
To speed up SPI flash read, enable DMA read function.
Signed-off-by: CK Hu <ck.hu@mediatek.com>
Change-Id: Ic1679ef7940258350feeadac50ad8ea407fd7b90
Reviewed-on: https://review.coreboot.org/c/coreboot/+/44851
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Hung-Te Lin <hungte@chromium.org>
Diffstat (limited to 'src/soc/mediatek')
-rw-r--r-- | src/soc/mediatek/mt8192/flash_controller.c | 56 |
1 files changed, 47 insertions, 9 deletions
diff --git a/src/soc/mediatek/mt8192/flash_controller.c b/src/soc/mediatek/mt8192/flash_controller.c index 304e4c353e..b2528809bc 100644 --- a/src/soc/mediatek/mt8192/flash_controller.c +++ b/src/soc/mediatek/mt8192/flash_controller.c @@ -8,6 +8,7 @@ #include <spi-generic.h> #include <stdint.h> #include <string.h> +#include <symbols.h> #include <timer.h> #include <types.h> @@ -91,25 +92,62 @@ static int sector_erase(int offset) return 0; } -static int pio_read(u32 addr, u8 *buf, u32 len) +static int dma_read(u32 addr, uintptr_t dma_buf, u32 len) { - set_sfpaddr(addr); - while (len) { - if (mt8192_nor_execute_cmd(SFLASH_RD_TRIGGER | SFLASH_AUTOINC)) - return -1; + struct stopwatch sw; - *buf++ = read8(&mt8192_nor->rdata); - len--; + assert(IS_ALIGNED((uintptr_t)addr, SFLASH_DMA_ALIGN) && + IS_ALIGNED(len, SFLASH_DMA_ALIGN)); + + /* do dma reset */ + write32(&mt8192_nor->fdma_ctl, SFLASH_DMA_SW_RESET); + write32(&mt8192_nor->fdma_ctl, SFLASH_DMA_WDLE_EN); + /* flash source address and dram dest address */ + write32(&mt8192_nor->fdma_fadr, addr); + write32(&mt8192_nor->fdma_dadr, dma_buf); + write32(&mt8192_nor->fdma_end_dadr, (dma_buf + len)); + /* start dma */ + write32(&mt8192_nor->fdma_ctl, SFLASH_DMA_TRIGGER | SFLASH_DMA_WDLE_EN); + + stopwatch_init_usecs_expire(&sw, SFLASH_POLLINGREG_US); + while ((read32(&mt8192_nor->fdma_ctl) & SFLASH_DMA_TRIGGER) != 0) { + if (stopwatch_expired(&sw)) { + printk(BIOS_WARNING, "dma read timeout!\n"); + return -1; + } } + return 0; } static int nor_read(const struct spi_flash *flash, u32 addr, size_t len, void *buf) { - if (pio_read(addr, buf, len)) - return -1; + uintptr_t dma_buf = (uintptr_t)_dma_coherent; + size_t dma_buf_len = REGION_SIZE(dma_coherent); + u32 start = ALIGN_DOWN(addr, SFLASH_DMA_ALIGN); + u32 skip = addr - start; + u32 total = ALIGN_UP(skip + len, SFLASH_DMA_ALIGN); + u32 drop = total - skip - len; + u32 done, read_len, copy_len; + uint8_t *dest = (uint8_t *)buf; + + /* DMA: start [ skip | len | drop ] = total end */ + for (done = 0; done < total; dest += copy_len) { + read_len = MIN(dma_buf_len, total - done); + if (dma_read(start + done, dma_buf, read_len)) + return -1; + + done += read_len; + /* decide the range to copy into buffer */ + if (done == total) + read_len -= drop; /* Only drop in last iteration */ + copy_len = read_len - skip; + memcpy(dest, (uint8_t *)dma_buf + skip, copy_len); + if (skip) + skip = 0; /* Only apply skip in first iteration. */ + } return 0; } |