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72 lines
1.8 KiB
Diff
72 lines
1.8 KiB
Diff
From b9c998eb7735df8000cf48d77f9271823e8e73da Mon Sep 17 00:00:00 2001
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From: Ram Chandra Jangir <rjangi@codeaurora.org>
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Date: Thu, 9 Mar 2017 09:39:05 +0100
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Subject: [PATCH 68/69] spi: add gpio cs support
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Signed-off-by: John Crispin <john@phrozen.org>
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---
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drivers/spi/spi-qup.c | 38 ++++++++++++++++++++++++++++++++++++++
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1 file changed, 38 insertions(+)
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--- a/drivers/spi/spi-qup.c
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+++ b/drivers/spi/spi-qup.c
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@@ -24,6 +24,7 @@
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#include <linux/spi/spi.h>
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#include <linux/dmaengine.h>
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#include <linux/dma-mapping.h>
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+#include <linux/gpio.h>
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#define QUP_CONFIG 0x0000
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#define QUP_STATE 0x0004
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@@ -1019,6 +1020,38 @@ err_tx:
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return ret;
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}
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+static void spi_qup_set_cs(struct spi_device *spi, bool val)
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+{
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+ struct spi_qup *controller;
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+ u32 spi_ioc;
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+ u32 spi_ioc_orig;
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+
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+ controller = spi_master_get_devdata(spi->master);
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+ spi_ioc = readl_relaxed(controller->base + SPI_IO_CONTROL);
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+ spi_ioc_orig = spi_ioc;
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+ if (!val)
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+ spi_ioc |= SPI_IO_C_FORCE_CS;
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+ else
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+ spi_ioc &= ~SPI_IO_C_FORCE_CS;
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+
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+ if (spi_ioc != spi_ioc_orig)
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+ writel_relaxed(spi_ioc, controller->base + SPI_IO_CONTROL);
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+}
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+
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+static int spi_qup_setup(struct spi_device *spi)
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+{
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+ if (spi->cs_gpio >= 0) {
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+ if (spi->mode & SPI_CS_HIGH)
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+ gpio_set_value(spi->cs_gpio, 0);
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+ else
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+ gpio_set_value(spi->cs_gpio, 1);
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+
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+ udelay(10);
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+ }
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+
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+ return 0;
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+}
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+
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static int spi_qup_probe(struct platform_device *pdev)
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{
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struct spi_master *master;
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@@ -1115,6 +1148,11 @@ static int spi_qup_probe(struct platform
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if (of_device_is_compatible(dev->of_node, "qcom,spi-qup-v1.1.1"))
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controller->qup_v1 = 1;
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+ if (!controller->qup_v1)
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+ master->set_cs = spi_qup_set_cs;
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+ else
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+ master->setup = spi_qup_setup;
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+
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spin_lock_init(&controller->lock);
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init_completion(&controller->done);
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init_completion(&controller->dma_tx_done);
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