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64 lines
2.4 KiB
64 lines
2.4 KiB
From 905ee06a9966113fe51d6bad1819759cb30fd0bd Mon Sep 17 00:00:00 2001
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From: Ionela Voinescu <ionela.voinescu@imgtec.com>
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Date: Tue, 9 Feb 2016 10:18:31 +0000
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Subject: spi: img-spfi: use device 0 configuration for all devices
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Given that we control the chip select line externally
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we can use only one parameter register (device 0 parameter
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register) and one set of configuration bits (port configuration
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bits for device 0) for all devices (all chip select lines).
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Signed-off-by: Ionela Voinescu <ionela.voinescu@imgtec.com>
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---
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drivers/spi/spi-img-spfi.c | 23 ++++++++++++++++-------
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1 file changed, 16 insertions(+), 7 deletions(-)
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--- a/drivers/spi/spi-img-spfi.c
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+++ b/drivers/spi/spi-img-spfi.c
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@@ -437,18 +437,23 @@ static int img_spfi_prepare(struct spi_m
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struct img_spfi *spfi = spi_master_get_devdata(master);
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u32 val;
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+ /*
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+ * The chip select line is controlled externally so
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+ * we can use the CS0 configuration for all devices
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+ */
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val = spfi_readl(spfi, SPFI_PORT_STATE);
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+
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+ /* 0 for device selection */
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val &= ~(SPFI_PORT_STATE_DEV_SEL_MASK <<
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SPFI_PORT_STATE_DEV_SEL_SHIFT);
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- val |= msg->spi->chip_select << SPFI_PORT_STATE_DEV_SEL_SHIFT;
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if (msg->spi->mode & SPI_CPHA)
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- val |= SPFI_PORT_STATE_CK_PHASE(msg->spi->chip_select);
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+ val |= SPFI_PORT_STATE_CK_PHASE(0);
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else
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- val &= ~SPFI_PORT_STATE_CK_PHASE(msg->spi->chip_select);
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+ val &= ~SPFI_PORT_STATE_CK_PHASE(0);
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if (msg->spi->mode & SPI_CPOL)
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- val |= SPFI_PORT_STATE_CK_POL(msg->spi->chip_select);
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+ val |= SPFI_PORT_STATE_CK_POL(0);
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else
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- val &= ~SPFI_PORT_STATE_CK_POL(msg->spi->chip_select);
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+ val &= ~SPFI_PORT_STATE_CK_POL(0);
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spfi_writel(spfi, val, SPFI_PORT_STATE);
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return 0;
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@@ -548,11 +553,15 @@ static void img_spfi_config(struct spi_m
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div = DIV_ROUND_UP(clk_get_rate(spfi->spfi_clk), xfer->speed_hz);
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div = clamp(512 / (1 << get_count_order(div)), 1, 128);
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- val = spfi_readl(spfi, SPFI_DEVICE_PARAMETER(spi->chip_select));
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+ /*
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+ * The chip select line is controlled externally so
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+ * we can use the CS0 parameters for all devices
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+ */
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+ val = spfi_readl(spfi, SPFI_DEVICE_PARAMETER(0));
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val &= ~(SPFI_DEVICE_PARAMETER_BITCLK_MASK <<
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SPFI_DEVICE_PARAMETER_BITCLK_SHIFT);
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val |= div << SPFI_DEVICE_PARAMETER_BITCLK_SHIFT;
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- spfi_writel(spfi, val, SPFI_DEVICE_PARAMETER(spi->chip_select));
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+ spfi_writel(spfi, val, SPFI_DEVICE_PARAMETER(0));
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if (!list_is_last(&xfer->transfer_list, &master->cur_msg->transfers) &&
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/*
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