mtd: gpmi: move to use generic DMA helper
With the generic DMA device tree helper supported by mxs-dma driver,
client devices only need to call dma_request_slave_channel() for
requesting a DMA channel from dmaengine.
Signed-off-by: Shawn Guo <shawn.guo@linaro.org>
Acked-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>
Reviewed-by: Arnd Bergmann <arnd@arndb.de>
diff --git a/Documentation/devicetree/bindings/mtd/gpmi-nand.txt b/Documentation/devicetree/bindings/mtd/gpmi-nand.txt
index 3fb3f901..551b2a1 100644
--- a/Documentation/devicetree/bindings/mtd/gpmi-nand.txt
+++ b/Documentation/devicetree/bindings/mtd/gpmi-nand.txt
@@ -7,10 +7,12 @@
- compatible : should be "fsl,<chip>-gpmi-nand"
- reg : should contain registers location and length for gpmi and bch.
- reg-names: Should contain the reg names "gpmi-nand" and "bch"
- - interrupts : The first is the DMA interrupt number for GPMI.
- The second is the BCH interrupt number.
- - interrupt-names : The interrupt names "gpmi-dma", "bch";
- - fsl,gpmi-dma-channel : Should contain the dma channel it uses.
+ - interrupts : BCH interrupt number.
+ - interrupt-names : Should be "bch".
+ - dmas: DMA specifier, consisting of a phandle to DMA controller node
+ and GPMI DMA channel ID.
+ Refer to dma.txt and fsl-mxs-dma.txt for details.
+ - dma-names: Must be "rx-tx".
Optional properties:
- nand-on-flash-bbt: boolean to enable on flash bbt option if not
@@ -27,9 +29,10 @@
#size-cells = <1>;
reg = <0x8000c000 2000>, <0x8000a000 2000>;
reg-names = "gpmi-nand", "bch";
- interrupts = <88>, <41>;
- interrupt-names = "gpmi-dma", "bch";
- fsl,gpmi-dma-channel = <4>;
+ interrupts = <41>;
+ interrupt-names = "bch";
+ dmas = <&dma_apbh 4>;
+ dma-names = "rx-tx";
partition@0 {
...
diff --git a/drivers/mtd/nand/gpmi-nand/gpmi-nand.c b/drivers/mtd/nand/gpmi-nand/gpmi-nand.c
index 717881a..25ecfa1 100644
--- a/drivers/mtd/nand/gpmi-nand/gpmi-nand.c
+++ b/drivers/mtd/nand/gpmi-nand/gpmi-nand.c
@@ -36,7 +36,6 @@
#define GPMI_NAND_GPMI_REGS_ADDR_RES_NAME "gpmi-nand"
#define GPMI_NAND_BCH_REGS_ADDR_RES_NAME "bch"
#define GPMI_NAND_BCH_INTERRUPT_RES_NAME "bch"
-#define GPMI_NAND_DMA_INTERRUPT_RES_NAME "gpmi-dma"
/* add our owner bbt descriptor */
static uint8_t scan_ff_pattern[] = { 0xff };
@@ -420,28 +419,6 @@
free_irq(i, this);
}
-static bool gpmi_dma_filter(struct dma_chan *chan, void *param)
-{
- struct gpmi_nand_data *this = param;
- int dma_channel = (int)this->private;
-
- if (!mxs_dma_is_apbh(chan))
- return false;
- /*
- * only catch the GPMI dma channels :
- * for mx23 : MX23_DMA_GPMI0 ~ MX23_DMA_GPMI3
- * (These four channels share the same IRQ!)
- *
- * for mx28 : MX28_DMA_GPMI0 ~ MX28_DMA_GPMI7
- * (These eight channels share the same IRQ!)
- */
- if (dma_channel == chan->chan_id) {
- chan->private = &this->dma_data;
- return true;
- }
- return false;
-}
-
static void release_dma_channels(struct gpmi_nand_data *this)
{
unsigned int i;
@@ -455,36 +432,10 @@
static int acquire_dma_channels(struct gpmi_nand_data *this)
{
struct platform_device *pdev = this->pdev;
- struct resource *r_dma;
- struct device_node *dn;
- u32 dma_channel;
- int ret;
struct dma_chan *dma_chan;
- dma_cap_mask_t mask;
-
- /* dma channel, we only use the first one. */
- dn = pdev->dev.of_node;
- ret = of_property_read_u32(dn, "fsl,gpmi-dma-channel", &dma_channel);
- if (ret) {
- pr_err("unable to get DMA channel from dt.\n");
- goto acquire_err;
- }
- this->private = (void *)dma_channel;
-
- /* gpmi dma interrupt */
- r_dma = platform_get_resource_byname(pdev, IORESOURCE_IRQ,
- GPMI_NAND_DMA_INTERRUPT_RES_NAME);
- if (!r_dma) {
- pr_err("Can't get resource for DMA\n");
- goto acquire_err;
- }
- this->dma_data.chan_irq = r_dma->start;
/* request dma channel */
- dma_cap_zero(mask);
- dma_cap_set(DMA_SLAVE, mask);
-
- dma_chan = dma_request_channel(mask, gpmi_dma_filter, this);
+ dma_chan = dma_request_slave_channel(&pdev->dev, "rx-tx");
if (!dma_chan) {
pr_err("Failed to request DMA channel.\n");
goto acquire_err;
diff --git a/drivers/mtd/nand/gpmi-nand/gpmi-nand.h b/drivers/mtd/nand/gpmi-nand/gpmi-nand.h
index 0729477..a7685e3 100644
--- a/drivers/mtd/nand/gpmi-nand/gpmi-nand.h
+++ b/drivers/mtd/nand/gpmi-nand/gpmi-nand.h
@@ -20,7 +20,7 @@
#include <linux/mtd/nand.h>
#include <linux/platform_device.h>
#include <linux/dma-mapping.h>
-#include <linux/fsl/mxs-dma.h>
+#include <linux/dmaengine.h>
#define GPMI_CLK_MAX 5 /* MX6Q needs five clocks */
struct resources {
@@ -180,7 +180,6 @@
/* DMA channels */
#define DMA_CHANS 8
struct dma_chan *dma_chans[DMA_CHANS];
- struct mxs_dma_data dma_data;
enum dma_ops_type last_dma_type;
enum dma_ops_type dma_type;
struct completion dma_done;