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authorDaniel Mack <zonque@gmail.com>2012-07-22 19:51:02 +0200
committerHaojian Zhuang <haojian.zhuang@gmail.com>2012-08-16 16:14:24 +0800
commit1e7ba630d4aeabef8e022a4099b20ab9f660d37d (patch)
treeaaafa789d13ab154e42367cfc3f599d0b09610aa /drivers/mtd/nand/pxa3xx_nand.c
parent9020b7cc27439e23a0e993f79ef8632fea5e88d5 (diff)
MTD: pxa3xx-nand: add devicetree bindings
This patch contains a hack to get the DMA resources of the device when probed from a devicetree node. This can be removed once a generic DMA controller framework lands. A mtd_part_parser_data is passed mtd_device_parse_register which contains a reference to the device node, so MTD partitions can be added as children. Signed-off-by: Daniel Mack <zonque@gmail.com> Cc: David Woodhouse <dwmw2@infradead.org> Acked-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Haojian Zhuang <haojian.zhuang@gmail.com>
Diffstat (limited to 'drivers/mtd/nand/pxa3xx_nand.c')
-rw-r--r--drivers/mtd/nand/pxa3xx_nand.c85
1 files changed, 71 insertions, 14 deletions
diff --git a/drivers/mtd/nand/pxa3xx_nand.c b/drivers/mtd/nand/pxa3xx_nand.c
index 252aaefcacf..b0319d8934a 100644
--- a/drivers/mtd/nand/pxa3xx_nand.c
+++ b/drivers/mtd/nand/pxa3xx_nand.c
@@ -22,6 +22,8 @@
#include <linux/io.h>
#include <linux/irq.h>
#include <linux/slab.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
#include <mach/dma.h>
#include <plat/pxa3xx_nand.h>
@@ -1081,21 +1083,31 @@ static int alloc_nand_resource(struct platform_device *pdev)
}
clk_enable(info->clk);
- r = platform_get_resource(pdev, IORESOURCE_DMA, 0);
- if (r == NULL) {
- dev_err(&pdev->dev, "no resource defined for data DMA\n");
- ret = -ENXIO;
- goto fail_put_clk;
- }
- info->drcmr_dat = r->start;
+ /*
+ * This is a dirty hack to make this driver work from devicetree
+ * bindings. It can be removed once we have a prober DMA controller
+ * framework for DT.
+ */
+ if (pdev->dev.of_node && cpu_is_pxa3xx()) {
+ info->drcmr_dat = 97;
+ info->drcmr_cmd = 99;
+ } else {
+ r = platform_get_resource(pdev, IORESOURCE_DMA, 0);
+ if (r == NULL) {
+ dev_err(&pdev->dev, "no resource defined for data DMA\n");
+ ret = -ENXIO;
+ goto fail_put_clk;
+ }
+ info->drcmr_dat = r->start;
- r = platform_get_resource(pdev, IORESOURCE_DMA, 1);
- if (r == NULL) {
- dev_err(&pdev->dev, "no resource defined for command DMA\n");
- ret = -ENXIO;
- goto fail_put_clk;
+ r = platform_get_resource(pdev, IORESOURCE_DMA, 1);
+ if (r == NULL) {
+ dev_err(&pdev->dev, "no resource defined for command DMA\n");
+ ret = -ENXIO;
+ goto fail_put_clk;
+ }
+ info->drcmr_cmd = r->start;
}
- info->drcmr_cmd = r->start;
irq = platform_get_irq(pdev, 0);
if (irq < 0) {
@@ -1200,12 +1212,55 @@ static int pxa3xx_nand_remove(struct platform_device *pdev)
return 0;
}
+#ifdef CONFIG_OF
+static struct of_device_id pxa3xx_nand_dt_ids[] = {
+ { .compatible = "marvell,pxa3xx-nand" },
+ {}
+};
+MODULE_DEVICE_TABLE(of, i2c_pxa_dt_ids);
+
+static int pxa3xx_nand_probe_dt(struct platform_device *pdev)
+{
+ struct pxa3xx_nand_platform_data *pdata;
+ struct device_node *np = pdev->dev.of_node;
+ const struct of_device_id *of_id =
+ of_match_device(pxa3xx_nand_dt_ids, &pdev->dev);
+
+ if (!of_id)
+ return 0;
+
+ pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
+ if (!pdata)
+ return -ENOMEM;
+
+ if (of_get_property(np, "marvell,nand-enable-arbiter", NULL))
+ pdata->enable_arbiter = 1;
+ if (of_get_property(np, "marvell,nand-keep-config", NULL))
+ pdata->keep_config = 1;
+ of_property_read_u32(np, "num-cs", &pdata->num_cs);
+
+ pdev->dev.platform_data = pdata;
+
+ return 0;
+}
+#else
+static inline int pxa3xx_nand_probe_dt(struct platform_device *)
+{
+ return 0;
+}
+#endif
+
static int pxa3xx_nand_probe(struct platform_device *pdev)
{
struct pxa3xx_nand_platform_data *pdata;
+ struct mtd_part_parser_data ppdata = {};
struct pxa3xx_nand_info *info;
int ret, cs, probe_success;
+ ret = pxa3xx_nand_probe_dt(pdev);
+ if (ret)
+ return ret;
+
pdata = pdev->dev.platform_data;
if (!pdata) {
dev_err(&pdev->dev, "no platform data defined\n");
@@ -1229,8 +1284,9 @@ static int pxa3xx_nand_probe(struct platform_device *pdev)
continue;
}
+ ppdata.of_node = pdev->dev.of_node;
ret = mtd_device_parse_register(info->host[cs]->mtd, NULL,
- NULL, pdata->parts[cs],
+ &ppdata, pdata->parts[cs],
pdata->nr_parts[cs]);
if (!ret)
probe_success = 1;
@@ -1306,6 +1362,7 @@ static int pxa3xx_nand_resume(struct platform_device *pdev)
static struct platform_driver pxa3xx_nand_driver = {
.driver = {
.name = "pxa3xx-nand",
+ .of_match_table = of_match_ptr(pxa3xx_nand_dt_ids),
},
.probe = pxa3xx_nand_probe,
.remove = pxa3xx_nand_remove,