openwrt/target/linux/ipq806x/patches-4.4/709-spi-qup-Fix-fifo-and-dma-support-for-IPQ806x.patch

From 16d2871830ff3fe12a6bff582549a9264adff278 Mon Sep 17 00:00:00 2001
From: Ram Chandra Jangir <rjangi@codeaurora.org>
Date: Tue, 10 May 2016 20:19:31 +0530
Subject: [PATCH] spi: qup: Fix fifo and dma support for IPQ806x

Signed-off-by: Ram Chandra Jangir <rjangi@codeaurora.org>
---
 drivers/spi/spi-qup.c | 54 +++++++++++++++++++++++++++++++++++++++++++++++++--
 1 file changed, 52 insertions(+), 2 deletions(-)

diff --git a/drivers/spi/spi-qup.c b/drivers/spi/spi-qup.c
index 810a7fa..0808017 100644
--- 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
@@ -152,6 +153,7 @@ struct spi_qup {
 	int			use_dma;
 	struct dma_slave_config	rx_conf;
 	struct dma_slave_config	tx_conf;
+	int mode;
 };
 
 
@@ -370,7 +372,8 @@ static int spi_qup_do_pio(struct spi_master *master, struct spi_transfer *xfer)
 		return ret;
 	}
 
-	spi_qup_fifo_write(qup, xfer);
+	if (qup->mode == QUP_IO_M_MODE_FIFO)
+		spi_qup_fifo_write(qup, xfer);
 
 	return 0;
 }
@@ -448,6 +451,7 @@ spi_qup_get_mode(struct spi_master *master, struct spi_transfer *xfer)
 {
 	struct spi_qup *qup = spi_master_get_devdata(master);
 	u32 mode;
+	size_t dma_align = dma_get_cache_alignment();
 
 	qup->w_size = 4;
 
@@ -458,6 +462,14 @@ spi_qup_get_mode(struct spi_master *master, struct spi_transfer *xfer)
 
 	qup->n_words = xfer->len / qup->w_size;
 
+	if (!IS_ERR_OR_NULL(master->dma_rx) &&
+			IS_ALIGNED((size_t)xfer->tx_buf, dma_align) &&
+			IS_ALIGNED((size_t)xfer->rx_buf, dma_align) &&
+			!is_vmalloc_addr(xfer->tx_buf) &&
+			!is_vmalloc_addr(xfer->rx_buf) &&
+			(xfer->len > 3*qup->in_blk_sz))
+		qup->use_dma = 1;
+
 	if (qup->n_words <= (qup->in_fifo_sz / sizeof(u32)))
 		mode = QUP_IO_M_MODE_FIFO;
 	else
@@ -491,7 +503,7 @@ static int spi_qup_io_config(struct spi_device *spi, struct spi_transfer *xfer)
 		return -EIO;
 	}
 
-	mode = spi_qup_get_mode(spi->master, xfer);
+	controller->mode = mode = spi_qup_get_mode(spi->master, xfer);
 	n_words = controller->n_words;
 
 	if (mode == QUP_IO_M_MODE_FIFO) {
@@ -500,6 +512,7 @@ static int spi_qup_io_config(struct spi_device *spi, struct spi_transfer *xfer)
 		/* must be zero for FIFO */
 		writel_relaxed(0, controller->base + QUP_MX_INPUT_CNT);
 		writel_relaxed(0, controller->base + QUP_MX_OUTPUT_CNT);
+		controller->use_dma = 0;
 	} else if (!controller->use_dma) {
 		writel_relaxed(n_words, controller->base + QUP_MX_INPUT_CNT);
 		writel_relaxed(n_words, controller->base + QUP_MX_OUTPUT_CNT);
@@ -750,6 +763,38 @@ 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;
@@ -846,6 +891,11 @@ static int spi_qup_probe(struct platform_device *pdev)
 	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);
 
-- 
2.7.2