You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
71 lines
1.8 KiB
71 lines
1.8 KiB
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);
|
|
|