Re: [PATCH 8/9] arm: twr-k70f120m: extend Freescale eDMA driver with ability to support Kinetis SoC
From: Paul Osmialowski
Date: Wed Jun 24 2015 - 13:48:46 EST
Hi Vinod,
Tanks for your comments. Actually, fsl-lpuart driver is done the way you
propose to rework this one. I'll consider this during my work on the
second iteration.
On Wed, 24 Jun 2015, Vinod Koul wrote:
On Tue, Jun 23, 2015 at 11:19:46PM +0200, Paul Osmialowski wrote:
Surprisingly small amount of work was required in order to extend already
existing eDMA driver with the support for Kinetis SoC architecture.
Note that <mach/memory.h> is needed (which is denoted by
CONFIG_NEED_MACH_MEMORY_H) as it provides macros required for proper
operation of DMA allocation functions.
Signed-off-by: Paul Osmialowski <pawelo@xxxxxxxxxxx>
---
Documentation/devicetree/bindings/dma/fsl-edma.txt | 38 +++++++++-
arch/arm/Kconfig | 4 ++
arch/arm/boot/dts/kinetis.dtsi | 34 +++++++++
arch/arm/mach-kinetis/include/mach/memory.h | 61 ++++++++++++++++
drivers/clk/clk-kinetis.c | 15 ++++
drivers/dma/fsl-edma.c | 81 +++++++++++++++++++++-
include/dt-bindings/clock/kinetis-mcg.h | 5 +-
having so many change into one patch is not a great idea, please breka them
up. I am looking for single/multiple patches which only touch dmaengine
files
+#ifdef CONFIG_ARCH_KINETIS
+static const char * const txirq_names[] = {
+ "edma-tx-0,16",
+ "edma-tx-1,17",
+ "edma-tx-2,18",
+ "edma-tx-3,19",
+ "edma-tx-4,20",
+ "edma-tx-5,21",
+ "edma-tx-6,22",
+ "edma-tx-7,23",
+ "edma-tx-8,24",
+ "edma-tx-9,25",
+ "edma-tx-10,26",
+ "edma-tx-11,27",
+ "edma-tx-12,28",
+ "edma-tx-13,29",
+ "edma-tx-14,30",
+ "edma-tx-15,31",
+};
why do we need this array, these seem to come from DT, right?
+#endif
+
struct fsl_edma_engine {
struct dma_device dma_dev;
void __iomem *membase;
+#ifdef CONFIG_ARCH_KINETIS
+ struct clk *clk;
+#endif
void __iomem *muxbase[DMAMUX_NR];
struct clk *muxclk[DMAMUX_NR];
struct mutex fsl_edma_mutex;
u32 n_chans;
+#ifdef CONFIG_ARCH_KINETIS
+ int txirq[ARRAY_SIZE(txirq_names)];
+#else
int txirq;
+#endif
int errirq;
bool big_endian;
struct fsl_edma_chan chans[];
we can define these bits and only be used on kinetis machines?
@@ -709,6 +737,7 @@ static irqreturn_t fsl_edma_err_handler(int irq, void *dev_id)
return IRQ_HANDLED;
}
+#ifndef CONFIG_ARCH_KINETIS
static irqreturn_t fsl_edma_irq_handler(int irq, void *dev_id)
{
if (fsl_edma_tx_handler(irq, dev_id) == IRQ_HANDLED)
@@ -716,6 +745,7 @@ static irqreturn_t fsl_edma_irq_handler(int irq, void *dev_id)
return fsl_edma_err_handler(irq, dev_id);
}
+#endif
static void fsl_edma_issue_pending(struct dma_chan *chan)
{
@@ -788,15 +818,29 @@ static void fsl_edma_free_chan_resources(struct dma_chan *chan)
}
static int
-fsl_edma_irq_init(struct platform_device *pdev, struct fsl_edma_engine *fsl_edma)
+fsl_edma_irq_init(struct platform_device *pdev,
+ struct fsl_edma_engine *fsl_edma)
{
int ret;
+#ifdef CONFIG_ARCH_KINETIS
+ int i;
+ for (i = 0; i < ARRAY_SIZE(txirq_names); i++) {
+ fsl_edma->txirq[i] = platform_get_irq_byname(pdev,
+ txirq_names[i]);
+ if (fsl_edma->txirq[i] < 0) {
+ dev_err(&pdev->dev, "Can't get %s irq.\n",
+ txirq_names[i]);
+ return fsl_edma->txirq[i];
+ }
+ }
+#else
fsl_edma->txirq = platform_get_irq_byname(pdev, "edma-tx");
if (fsl_edma->txirq < 0) {
dev_err(&pdev->dev, "Can't get edma-tx irq.\n");
return fsl_edma->txirq;
}
+#endif
can you have two routines and with one of them onvoked based on machine type
which should be configured based on DT data rather
fsl_edma->errirq = platform_get_irq_byname(pdev, "edma-err");
if (fsl_edma->errirq < 0) {
@@ -804,6 +848,16 @@ fsl_edma_irq_init(struct platform_device *pdev, struct fsl_edma_engine *fsl_edma
return fsl_edma->errirq;
}
+#ifdef CONFIG_ARCH_KINETIS
+ for (i = 0; i < ARRAY_SIZE(txirq_names); i++) {
+ ret = devm_request_irq(&pdev->dev, fsl_edma->txirq[i],
+ fsl_edma_tx_handler, 0, txirq_names[i], fsl_edma);
+ if (ret) {
+ dev_err(&pdev->dev, "Can't register eDMA tx IRQ.\n");
+ return ret;
+ }
+ }
+#else
if (fsl_edma->txirq == fsl_edma->errirq) {
ret = devm_request_irq(&pdev->dev, fsl_edma->txirq,
fsl_edma_irq_handler, 0, "eDMA", fsl_edma);
@@ -818,6 +872,7 @@ fsl_edma_irq_init(struct platform_device *pdev, struct fsl_edma_engine *fsl_edma
dev_err(&pdev->dev, "Can't register eDMA tx IRQ.\n");
return ret;
}
+#endif
only one of them will be populated so if-else should work too
please get rid of these ifdef stuff and make it based on DT data based flags
--
~Vinod
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