@@ -15,6 +15,7 @@ Required properties:
optional gpio and may be set to 0 if not present.
Optional properties:
+- atmel,nand-has-dma : boolean to support dma transfer for nand read/write.
- nand-ecc-mode : String, operation mode of the NAND ecc mode, soft by default.
Supported values are: "none", "soft", "hw", "hw_syndrome", "hw_oob_first",
"soft_bch".
@@ -43,8 +43,6 @@
#include <linux/platform_data/atmel.h>
#include <linux/pinctrl/consumer.h>
-#include <mach/cpu.h>
-
static int use_dma = 1;
module_param(use_dma, int, 0);
@@ -128,11 +126,6 @@ struct atmel_nand_host {
static struct nand_ecclayout atmel_pmecc_oobinfo;
-static int cpu_has_dma(void)
-{
- return cpu_is_at91sam9rl() || cpu_is_at91sam9g45();
-}
-
/*
* Enable NAND.
*/
@@ -1336,6 +1329,8 @@ static int atmel_of_init_port(struct atmel_nand_host *host,
board->on_flash_bbt = of_get_nand_on_flash_bbt(np);
+ board->has_dma = of_property_read_bool(np, "atmel,nand-has-dma");
+
if (of_get_nand_bus_width(np) == 16)
board->bus_width_16 = 1;
@@ -1600,7 +1595,7 @@ static int __init atmel_nand_probe(struct platform_device *pdev)
nand_chip->bbt_options |= NAND_BBT_USE_FLASH;
}
- if (!cpu_has_dma())
+ if (!host->board.has_dma)
use_dma = 0;
if (use_dma) {
@@ -71,6 +71,7 @@ struct atmel_nand_data {
u8 on_flash_bbt; /* bbt on flash */
struct mtd_partition *parts;
unsigned int num_parts;
+ bool has_dma; /* support dma transfer */
/* default is false, only for at32ap7000 chip is true */
bool need_reset_workaround;
This patch will set the nand dma support in dts. Since we will not use cpu_is_xxx() in nand driver. We needn't include the mach/cpu.h any more. Signed-off-by: Josh Wu <josh.wu@atmel.com> --- .../devicetree/bindings/mtd/atmel-nand.txt | 1 + drivers/mtd/nand/atmel_nand.c | 11 +++-------- include/linux/platform_data/atmel.h | 1 + 3 files changed, 5 insertions(+), 8 deletions(-)