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