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69 lines
2.2 KiB
Diff
69 lines
2.2 KiB
Diff
From 61dc388f577b6f984797949f32c30021d9ea73dc Mon Sep 17 00:00:00 2001
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From: Jonas Gorski <jogo@openwrt.org>
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Date: Sun, 23 Aug 2015 12:16:02 +0200
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Subject: [PATCH V2] spi/bcm63xx-hsspi: add support for dual spi read/write
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Add support for dual read/writes on spi-bcm63xx-hsspi. This has been
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tested with a s25fl129p1 dual read capable spi flash, with a nice speed
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improvement:
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serial read:
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root@OpenWrt:/# time dd if=/dev/mtd4 of=/dev/null bs=8192
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2032+0 records in
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2032+0 records out
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real 0m 4.39s
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user 0m 0.00s
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sys 0m 1.55s
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dual read:
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root@OpenWrt:/# time dd if=/dev/mtd4 of=/dev/null bs=8192
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2032+0 records in
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2032+0 records out
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real 0m 3.09s
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user 0m 0.00s
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sys 0m 1.56s
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Signed-off-by: Jonas Gorski <jogo@openwrt.org>
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---
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drivers/spi/spi-bcm63xx-hsspi.c | 13 +++++++++----
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1 file changed, 9 insertions(+), 4 deletions(-)
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--- a/drivers/spi/spi-bcm63xx-hsspi.c
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+++ b/drivers/spi/spi-bcm63xx-hsspi.c
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@@ -76,6 +76,7 @@
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#define HSSPI_FIFO_REG(x) (0x200 + (x) * 0x200)
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+#define HSSPI_OP_MULTIBIT BIT(11)
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#define HSSPI_OP_CODE_SHIFT 13
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#define HSSPI_OP_SLEEP (0 << HSSPI_OP_CODE_SHIFT)
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#define HSSPI_OP_READ_WRITE (1 << HSSPI_OP_CODE_SHIFT)
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@@ -171,9 +172,12 @@ static int bcm63xx_hsspi_do_txrx(struct
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if (opcode != HSSPI_OP_READ)
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step_size -= HSSPI_OPCODE_LEN;
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- __raw_writel(0 << MODE_CTRL_PREPENDBYTE_CNT_SHIFT |
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- 2 << MODE_CTRL_MULTIDATA_WR_STRT_SHIFT |
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- 2 << MODE_CTRL_MULTIDATA_RD_STRT_SHIFT | 0xff,
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+ if ((opcode == HSSPI_OP_READ && t->rx_nbits == SPI_NBITS_DUAL) ||
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+ (opcode == HSSPI_OP_WRITE && t->tx_nbits == SPI_NBITS_DUAL))
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+ opcode |= HSSPI_OP_MULTIBIT;
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+
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+ __raw_writel(1 << MODE_CTRL_MULTIDATA_WR_SIZE_SHIFT |
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+ 1 << MODE_CTRL_MULTIDATA_RD_SIZE_SHIFT | 0xff,
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bs->regs + HSSPI_PROFILE_MODE_CTRL_REG(chip_select));
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while (pending > 0) {
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@@ -374,7 +378,8 @@ static int bcm63xx_hsspi_probe(struct pl
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master->num_chipselect = 8;
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master->setup = bcm63xx_hsspi_setup;
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master->transfer_one_message = bcm63xx_hsspi_transfer_one;
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- master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_CS_HIGH;
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+ master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_CS_HIGH |
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+ SPI_RX_DUAL | SPI_TX_DUAL;
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master->bits_per_word_mask = SPI_BPW_MASK(8);
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master->auto_runtime_pm = true;
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