mtd: mxc_nand: implement device tree probing

This is tested on i.MX27.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
This commit is contained in:
Uwe Kleine-König 2012-04-23 11:23:41 +02:00 committed by David Woodhouse
parent f48d0f9aa9
commit 6436356ba1
2 changed files with 114 additions and 19 deletions

View file

@ -0,0 +1,19 @@
* Freescale's mxc_nand
Required properties:
- compatible: "fsl,imxXX-nand"
- reg: address range of the nfc block
- interrupts: irq to be used
- nand-bus-width: see nand.txt
- nand-ecc-mode: see nand.txt
- nand-on-flash-bbt: see nand.txt
Example:
nand@d8000000 {
compatible = "fsl,imx27-nand";
reg = <0xd8000000 0x1000>;
interrupts = <29>;
nand-bus-width = <8>;
nand-ecc-mode = "hw";
};

View file

@ -32,6 +32,8 @@
#include <linux/io.h>
#include <linux/irq.h>
#include <linux/completion.h>
#include <linux/of_device.h>
#include <linux/of_mtd.h>
#include <asm/mach/flash.h>
#include <mach/mxc_nand.h>
@ -199,6 +201,7 @@ struct mxc_nand_host {
unsigned int buf_start;
const struct mxc_nand_devtype_data *devtype_data;
struct mxc_nand_platform_data pdata;
};
/* OOB placement block for use with hardware ecc generation */
@ -268,7 +271,7 @@ static struct nand_ecclayout nandv2_hw_eccoob_4k = {
}
};
static const char *part_probes[] = { "RedBoot", "cmdlinepart", NULL };
static const char *part_probes[] = { "RedBoot", "cmdlinepart", "ofpart", NULL };
static int check_int_v3(struct mxc_nand_host *host)
{
@ -1236,11 +1239,85 @@ static const struct mxc_nand_devtype_data imx51_nand_devtype_data = {
.eccsize = 0,
};
#ifdef CONFIG_OF_MTD
static const struct of_device_id mxcnd_dt_ids[] = {
{
.compatible = "fsl,imx21-nand",
.data = &imx21_nand_devtype_data,
}, {
.compatible = "fsl,imx27-nand",
.data = &imx27_nand_devtype_data,
}, {
.compatible = "fsl,imx25-nand",
.data = &imx25_nand_devtype_data,
}, {
.compatible = "fsl,imx51-nand",
.data = &imx51_nand_devtype_data,
},
{ /* sentinel */ }
};
static int __init mxcnd_probe_dt(struct mxc_nand_host *host)
{
struct device_node *np = host->dev->of_node;
struct mxc_nand_platform_data *pdata = &host->pdata;
const struct of_device_id *of_id =
of_match_device(mxcnd_dt_ids, host->dev);
int buswidth;
if (!np)
return 1;
if (of_get_nand_ecc_mode(np) >= 0)
pdata->hw_ecc = 1;
pdata->flash_bbt = of_get_nand_on_flash_bbt(np);
buswidth = of_get_nand_bus_width(np);
if (buswidth < 0)
return buswidth;
pdata->width = buswidth / 8;
host->devtype_data = of_id->data;
return 0;
}
#else
static int __init mxcnd_probe_dt(struct mxc_nand_host *host)
{
return 1;
}
#endif
static int __init mxcnd_probe_pdata(struct mxc_nand_host *host)
{
struct mxc_nand_platform_data *pdata = host->dev->platform_data;
if (!pdata)
return -ENODEV;
host->pdata = *pdata;
if (nfc_is_v1()) {
if (cpu_is_mx21())
host->devtype_data = &imx21_nand_devtype_data;
else
host->devtype_data = &imx27_nand_devtype_data;
} else if (nfc_is_v21()) {
host->devtype_data = &imx25_nand_devtype_data;
} else if (nfc_is_v3_2()) {
host->devtype_data = &imx51_nand_devtype_data;
} else
BUG();
return 0;
}
static int __init mxcnd_probe(struct platform_device *pdev)
{
struct nand_chip *this;
struct mtd_info *mtd;
struct mxc_nand_platform_data *pdata = pdev->dev.platform_data;
struct mxc_nand_host *host;
struct resource *res;
int err = 0;
@ -1297,17 +1374,11 @@ static int __init mxcnd_probe(struct platform_device *pdev)
host->main_area0 = host->base;
if (nfc_is_v1()) {
if (cpu_is_mx21())
host->devtype_data = &imx21_nand_devtype_data;
else
host->devtype_data = &imx27_nand_devtype_data;
} else if (nfc_is_v21()) {
host->devtype_data = &imx25_nand_devtype_data;
} else if (nfc_is_v3_2()) {
host->devtype_data = &imx51_nand_devtype_data;
} else
BUG();
err = mxcnd_probe_dt(host);
if (err > 0)
err = mxcnd_probe_pdata(host);
if (err < 0)
goto eirq;
if (host->devtype_data->regs_offset)
host->regs = host->base + host->devtype_data->regs_offset;
@ -1335,7 +1406,7 @@ static int __init mxcnd_probe(struct platform_device *pdev)
}
}
if (pdata->hw_ecc) {
if (host->pdata.hw_ecc) {
this->ecc.calculate = mxc_nand_calculate_ecc;
this->ecc.hwctl = mxc_nand_enable_hwecc;
this->ecc.correct = host->devtype_data->correct_data;
@ -1344,11 +1415,11 @@ static int __init mxcnd_probe(struct platform_device *pdev)
this->ecc.mode = NAND_ECC_SOFT;
}
/* NAND bus width determines access funtions used by upper layer */
if (pdata->width == 2)
/* NAND bus width determines access functions used by upper layer */
if (host->pdata.width == 2)
this->options |= NAND_BUSWIDTH_16;
if (pdata->flash_bbt) {
if (host->pdata.flash_bbt) {
this->bbt_td = &bbt_main_descr;
this->bbt_md = &bbt_mirror_descr;
/* update flash based bbt */
@ -1408,8 +1479,12 @@ static int __init mxcnd_probe(struct platform_device *pdev)
}
/* Register the partitions */
mtd_device_parse_register(mtd, part_probes, NULL, pdata->parts,
pdata->nr_parts);
mtd_device_parse_register(mtd, part_probes,
&(struct mtd_part_parser_data){
.of_node = pdev->dev.of_node,
},
host->pdata.parts,
host->pdata.nr_parts);
platform_set_drvdata(pdev, host);
@ -1451,6 +1526,7 @@ static struct platform_driver mxcnd_driver = {
.driver = {
.name = DRIVER_NAME,
.owner = THIS_MODULE,
.of_match_table = of_match_ptr(mxcnd_dt_ids),
},
.remove = __devexit_p(mxcnd_remove),
};