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| author | Axel Lin <axel.lin@ingics.com> | 2014-02-21 08:55:47 +0800 |
|---|---|---|
| committer | Jagannadha Sutradharudu Teki <jaganna@xilinx.com> | 2014-03-17 21:54:57 +0530 |
| commit | 7dfc4dbd2d1592ee420945afe6a82003c374b0de (patch) | |
| tree | 98be23c4969c1feec322bd7063965b94cbf2ece5 | |
| parent | c6136aad91da493c446f22af8f5d774a74dec9d1 (diff) | |
| download | u-boot-7dfc4dbd2d1592ee420945afe6a82003c374b0de.zip u-boot-7dfc4dbd2d1592ee420945afe6a82003c374b0de.tar.gz u-boot-7dfc4dbd2d1592ee420945afe6a82003c374b0de.tar.bz2 | |
spi: atmel_dataflash: Simplify AT91F_SpiEnable implementation
Refactor the code a bit to make it better in readability.
Remove the comments because now the intention of the code is pretty clear.
Signed-off-by: Axel Lin <axel.lin@ingics.com>
Reviewed-by: Jagannadha Sutradharudu Teki <jaganna@xilinx.com>
| -rw-r--r-- | drivers/spi/atmel_dataflash_spi.c | 31 |
1 files changed, 12 insertions, 19 deletions
diff --git a/drivers/spi/atmel_dataflash_spi.c b/drivers/spi/atmel_dataflash_spi.c index 8a5eddc..a2e9c00 100644 --- a/drivers/spi/atmel_dataflash_spi.c +++ b/drivers/spi/atmel_dataflash_spi.c @@ -102,33 +102,26 @@ void AT91F_SpiEnable(int cs) { unsigned long mode; + mode = readl(ATMEL_BASE_SPI0 + AT91_SPI_MR); + mode &= ~AT91_SPI_PCS; + switch (cs) { - case 0: /* Configure SPI CS0 for Serial DataFlash AT45DBxx */ - mode = readl(ATMEL_BASE_SPI0 + AT91_SPI_MR); - mode &= 0xFFF0FFFF; - writel(mode | ((AT91_SPI_PCS0_DATAFLASH_CARD<<16) & AT91_SPI_PCS), - ATMEL_BASE_SPI0 + AT91_SPI_MR); + case 0: + mode |= AT91_SPI_PCS0_DATAFLASH_CARD << 16; break; - case 1: /* Configure SPI CS1 for Serial DataFlash AT45DBxx */ - mode = readl(ATMEL_BASE_SPI0 + AT91_SPI_MR); - mode &= 0xFFF0FFFF; - writel(mode | ((AT91_SPI_PCS1_DATAFLASH_CARD<<16) & AT91_SPI_PCS), - ATMEL_BASE_SPI0 + AT91_SPI_MR); + case 1: + mode |= AT91_SPI_PCS1_DATAFLASH_CARD << 16; break; - case 2: /* Configure SPI CS2 for Serial DataFlash AT45DBxx */ - mode = readl(ATMEL_BASE_SPI0 + AT91_SPI_MR); - mode &= 0xFFF0FFFF; - writel(mode | ((AT91_SPI_PCS2_DATAFLASH_CARD<<16) & AT91_SPI_PCS), - ATMEL_BASE_SPI0 + AT91_SPI_MR); + case 2: + mode |= AT91_SPI_PCS2_DATAFLASH_CARD << 16; break; case 3: - mode = readl(ATMEL_BASE_SPI0 + AT91_SPI_MR); - mode &= 0xFFF0FFFF; - writel(mode | ((AT91_SPI_PCS3_DATAFLASH_CARD<<16) & AT91_SPI_PCS), - ATMEL_BASE_SPI0 + AT91_SPI_MR); + mode |= AT91_SPI_PCS3_DATAFLASH_CARD << 16; break; } + writel(mode, ATMEL_BASE_SPI0 + AT91_SPI_MR); + /* SPI_Enable */ writel(AT91_SPI_SPIEN, ATMEL_BASE_SPI0 + AT91_SPI_CR); } |