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Date: Mon, 27 May 2019 16:51:17 +0800
From: yibin.gong@....com
To: robh@...nel.org, shawnguo@...nel.org, s.hauer@...gutronix.de,
festevam@...il.com, mark.rutland@....com, vkoul@...nel.org,
dan.j.williams@...el.com
Cc: linux-imx@....com, linux-arm-kernel@...ts.infradead.org,
linux-kernel@...r.kernel.org, dmaengine@...r.kernel.org,
devicetree@...r.kernel.org, kernel@...gutronix.de
Subject: [PATCH v2 6/7] dmaengine: fsl-edma: add i.mx7ulp edma2 version support
From: Robin Gong <yibin.gong@....com>
Add edma2 for i.mx7ulp by version v3, since v2 has already
been used by mcf-edma.
The big changes based on v1 are belows:
1. only one dmamux.
2. another clock dma_clk except dmamux clk.
3. 16 independent interrupts instead of only one interrupt for
all channels.
Signed-off-by: Robin Gong <yibin.gong@....com>
---
drivers/dma/fsl-edma-common.c | 18 +++++++++-
drivers/dma/fsl-edma-common.h | 3 ++
drivers/dma/fsl-edma.c | 84 ++++++++++++++++++++++++++++++++++++++-----
3 files changed, 96 insertions(+), 9 deletions(-)
diff --git a/drivers/dma/fsl-edma-common.c b/drivers/dma/fsl-edma-common.c
index 45d70d3..0d9915c 100644
--- a/drivers/dma/fsl-edma-common.c
+++ b/drivers/dma/fsl-edma-common.c
@@ -90,6 +90,19 @@ static void mux_configure8(struct fsl_edma_chan *fsl_chan, void __iomem *addr,
iowrite8(val8, addr + off);
}
+void mux_configure32(struct fsl_edma_chan *fsl_chan, void __iomem *addr,
+ u32 off, u32 slot, bool enable)
+{
+ u32 val;
+
+ if (enable)
+ val = EDMAMUX_CHCFG_ENBL << 24 | slot;
+ else
+ val = EDMAMUX_CHCFG_DIS;
+
+ iowrite32(val, addr + off * 4);
+}
+
void fsl_edma_chan_mux(struct fsl_edma_chan *fsl_chan,
unsigned int slot, bool enable)
{
@@ -102,7 +115,10 @@ void fsl_edma_chan_mux(struct fsl_edma_chan *fsl_chan,
muxaddr = fsl_chan->edma->muxbase[ch / chans_per_mux];
slot = EDMAMUX_CHCFG_SOURCE(slot);
- mux_configure8(fsl_chan, muxaddr, ch_off, slot, enable);
+ if (fsl_chan->edma->version == v3)
+ mux_configure32(fsl_chan, muxaddr, ch_off, slot, enable);
+ else
+ mux_configure8(fsl_chan, muxaddr, ch_off, slot, enable);
}
EXPORT_SYMBOL_GPL(fsl_edma_chan_mux);
diff --git a/drivers/dma/fsl-edma-common.h b/drivers/dma/fsl-edma-common.h
index 21a9cfd..2b0cc8e 100644
--- a/drivers/dma/fsl-edma-common.h
+++ b/drivers/dma/fsl-edma-common.h
@@ -124,6 +124,7 @@ struct fsl_edma_chan {
dma_addr_t dma_dev_addr;
u32 dma_dev_size;
enum dma_data_direction dma_dir;
+ char chan_name[16];
};
struct fsl_edma_desc {
@@ -138,6 +139,7 @@ struct fsl_edma_desc {
enum edma_version {
v1, /* 32ch, Vybrid, mpc57x, etc */
v2, /* 64ch Coldfire */
+ v3, /* 32ch, i.mx7ulp */
};
struct fsl_edma_engine {
@@ -145,6 +147,7 @@ struct fsl_edma_engine {
void __iomem *membase;
void __iomem *muxbase[DMAMUX_NR];
struct clk *muxclk[DMAMUX_NR];
+ struct clk *dmaclk;
u32 dmamux_nr;
struct mutex fsl_edma_mutex;
u32 n_chans;
diff --git a/drivers/dma/fsl-edma.c b/drivers/dma/fsl-edma.c
index 7b65ef4..055f430 100644
--- a/drivers/dma/fsl-edma.c
+++ b/drivers/dma/fsl-edma.c
@@ -165,6 +165,51 @@ fsl_edma_irq_init(struct platform_device *pdev, struct fsl_edma_engine *fsl_edma
return 0;
}
+static int
+fsl_edma2_irq_init(struct platform_device *pdev,
+ struct fsl_edma_engine *fsl_edma)
+{
+ struct device_node *np = pdev->dev.of_node;
+ int i, ret, irq;
+ int count = 0;
+
+ count = of_irq_count(np);
+ dev_info(&pdev->dev, "%s Found %d interrupts\r\n", __func__, count);
+ if (count <= 2) {
+ dev_err(&pdev->dev, "Interrupts in DTS not correct.\n");
+ return -EINVAL;
+ }
+ /*
+ * 16 channel independent interrupts + 1 error interrupt on i.mx7ulp.
+ * 2 channel share one interrupt, for example, ch0/ch16, ch1/ch17...
+ * For now, just simply request irq without IRQF_SHARED flag, since 16
+ * channels are enough on i.mx7ulp whose M4 domain own some peripherals.
+ */
+ for (i = 0; i < count; i++) {
+ irq = platform_get_irq(pdev, i);
+ if (irq < 0)
+ return -ENXIO;
+
+ sprintf(fsl_edma->chans[i].chan_name, "eDMA2-CH%02d", i);
+
+ /* The last IRQ is for eDMA err */
+ if (i == count - 1)
+ ret = devm_request_irq(&pdev->dev, irq,
+ fsl_edma_err_handler,
+ 0, "eDMA2-ERR", fsl_edma);
+ else
+
+ ret = devm_request_irq(&pdev->dev, irq,
+ fsl_edma_tx_handler, 0,
+ fsl_edma->chans[i].chan_name,
+ fsl_edma);
+ if (ret)
+ return ret;
+ }
+
+ return 0;
+}
+
static void fsl_edma_irq_exit(
struct platform_device *pdev, struct fsl_edma_engine *fsl_edma)
{
@@ -184,8 +229,17 @@ static void fsl_disable_clocks(struct fsl_edma_engine *fsl_edma, int nr_clocks)
clk_disable_unprepare(fsl_edma->muxclk[i]);
}
+static const struct of_device_id fsl_edma_dt_ids[] = {
+ { .compatible = "fsl,vf610-edma", .data = (void *)v1 },
+ { .compatible = "fsl,imx7ulp-edma", .data = (void *)v3 },
+ { /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, fsl_edma_dt_ids);
+
static int fsl_edma_probe(struct platform_device *pdev)
{
+ const struct of_device_id *of_id =
+ of_match_device(fsl_edma_dt_ids, &pdev->dev);
struct device_node *np = pdev->dev.of_node;
struct fsl_edma_engine *fsl_edma;
struct fsl_edma_chan *fsl_chan;
@@ -205,7 +259,7 @@ static int fsl_edma_probe(struct platform_device *pdev)
if (!fsl_edma)
return -ENOMEM;
- fsl_edma->version = v1;
+ fsl_edma->version = (enum edma_version)of_id->data;
fsl_edma->dmamux_nr = DMAMUX_NR;
fsl_edma->n_chans = chans;
mutex_init(&fsl_edma->fsl_edma_mutex);
@@ -218,6 +272,22 @@ static int fsl_edma_probe(struct platform_device *pdev)
fsl_edma_setup_regs(fsl_edma);
regs = &fsl_edma->regs;
+ if (fsl_edma->version == v3) {
+ fsl_edma->dmamux_nr = 1;
+
+ fsl_edma->dmaclk = devm_clk_get(&pdev->dev, "dma");
+ if (IS_ERR(fsl_edma->dmaclk)) {
+ dev_err(&pdev->dev, "Missing DMA block clock.\n");
+ return PTR_ERR(fsl_edma->dmaclk);
+ }
+
+ ret = clk_prepare_enable(fsl_edma->dmaclk);
+ if (ret) {
+ dev_err(&pdev->dev, "DMA clk block failed.\n");
+ return ret;
+ }
+ }
+
for (i = 0; i < fsl_edma->dmamux_nr; i++) {
char clkname[32];
@@ -264,7 +334,11 @@ static int fsl_edma_probe(struct platform_device *pdev)
}
edma_writel(fsl_edma, ~0, regs->intl);
- ret = fsl_edma_irq_init(pdev, fsl_edma);
+
+ if (fsl_edma->version == v3)
+ ret = fsl_edma2_irq_init(pdev, fsl_edma);
+ else
+ ret = fsl_edma_irq_init(pdev, fsl_edma);
if (ret)
return ret;
@@ -383,12 +457,6 @@ static const struct dev_pm_ops fsl_edma_pm_ops = {
.resume_early = fsl_edma_resume_early,
};
-static const struct of_device_id fsl_edma_dt_ids[] = {
- { .compatible = "fsl,vf610-edma", },
- { /* sentinel */ }
-};
-MODULE_DEVICE_TABLE(of, fsl_edma_dt_ids);
-
static struct platform_driver fsl_edma_driver = {
.driver = {
.name = "fsl-edma",
--
2.7.4
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