soc/mediatek/mt8192: Add SPI flash controller dual read function
Support SPI flash dual read funciton which change spi mode (1-1-1) to dual mode (1-1-2). Signed-off-by: CK Hu <ck.hu@mediatek.com> Change-Id: Iabd3668fc4bc42137b7743144fc1cced4fe72737 Reviewed-on: https://review.coreboot.org/c/coreboot/+/44852 Reviewed-by: Patrick Georgi <pgeorgi@google.com> Reviewed-by: Hung-Te Lin <hungte@chromium.org> Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
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@ -132,6 +132,9 @@ static int nor_read(const struct spi_flash *flash, u32 addr, size_t len,
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u32 done, read_len, copy_len;
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uint8_t *dest = (uint8_t *)buf;
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setbits8(&mt8192_nor->read_dual, SFLASH_READ_DUAL_EN);
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write8(&mt8192_nor->prgdata[3], SFLASH_1_1_2_READ);
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/* DMA: start [ skip | len | drop ] = total end */
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for (done = 0; done < total; dest += copy_len) {
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read_len = MIN(dma_buf_len, total - done);
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@ -29,7 +29,10 @@ enum {
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/* DMA commands */
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SFLASH_DMA_TRIGGER = 1 << 0,
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SFLASH_DMA_SW_RESET = 1 << 1,
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SFLASH_DMA_WDLE_EN = 1 << 2
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SFLASH_DMA_WDLE_EN = 1 << 2,
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/* Dual mode */
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SFLASH_READ_DUAL_EN = 0x1,
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SFLASH_1_1_2_READ = 0x3b
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};
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/* register Offset */
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