openkylin
/
linux
mirror of https://gitee.com/openkylin/linux.git
9
0
Fork 0
Code Issues Projects Releases Wiki Activity

mtd: nand: fsmc: finally remove fsmc_nand_platform_data 

Since the driver now only supports DT probing, it doesn't make a lot of
sense to have a private data structure called platform_data, fill it in
with information coming from the DT, and then copying this into the
driver-specific structure fsmc_nand_data.

So instead, we remove fsmc_nand_platform_data entirely, and have
fsmc_nand_probe_config_dt() fill in the fsmc_nand_data structure
directly.

This requires calling fsmc_nand_probe_config_dt() after fsmc_nand_data
has been allocated instead of before.

Also, as an added bonus, we now propagate properly the return value of
fsmc_nand_probe_config_dt() instead of returning -ENODEV on failure. The
error message is also removed, since it no longer made any sense.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
This commit is contained in:
Thomas Petazzoni 2017-03-21 11:04:02 +01:00 committed by Boris Brezillon
parent c0d218c816
commit a1b1e1d5bd
1 changed files with 21 additions and 52 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

73
drivers/mtd/nand/fsmc_nand.c
View File

@ -132,26 +132,6 @@ enum access_mode {
USE_WORD_ACCESS,
};
/**
* fsmc_nand_platform_data - platform specific NAND controller config
* @nand_timings: timing setup for the physical NAND interface
* @partitions: partition table for the platform, use a default fallback
* if this is NULL
* @nr_partitions: the number of partitions in the previous entry
* @options: different options for the driver
* @width: bus width
* @bank: default bank
* platform-specific. If the controller only supports one bank
* this may be set to NULL
*/
struct fsmc_nand_platform_data {
struct fsmc_nand_timings *nand_timings;
unsigned int options;
unsigned int bank;
enum access_mode mode;
};
/**
* struct fsmc_nand_data - structure for FSMC NAND device state
*
@ -798,17 +778,18 @@ static bool filter(struct dma_chan *chan, void *slave)
}
static int fsmc_nand_probe_config_dt(struct platform_device *pdev,
struct device_node *np)
struct fsmc_nand_data *host,
struct nand_chip *nand)
{
struct fsmc_nand_platform_data *pdata = dev_get_platdata(&pdev->dev);
struct device_node *np = pdev->dev.of_node;
u32 val;
int ret;
pdata->options = 0;
nand->options = 0;
if (!of_property_read_u32(np, "bank-width", &val)) {
if (val == 2) {
pdata->options |= NAND_BUSWIDTH_16;
nand->options |= NAND_BUSWIDTH_16;
} else if (val != 1) {
dev_err(&pdev->dev, "invalid bank-width %u\n", val);
return -EINVAL;
@ -816,27 +797,27 @@ static int fsmc_nand_probe_config_dt(struct platform_device *pdev,
}
if (of_get_property(np, "nand-skip-bbtscan", NULL))
pdata->options |= NAND_SKIP_BBTSCAN;
nand->options |= NAND_SKIP_BBTSCAN;
pdata->nand_timings = devm_kzalloc(&pdev->dev,
sizeof(*pdata->nand_timings), GFP_KERNEL);
if (!pdata->nand_timings)
host->dev_timings = devm_kzalloc(&pdev->dev,
sizeof(*host->dev_timings), GFP_KERNEL);
if (!host->dev_timings)
return -ENOMEM;
ret = of_property_read_u8_array(np, "timings", (u8 *)pdata->nand_timings,
sizeof(*pdata->nand_timings));
ret = of_property_read_u8_array(np, "timings", (u8 *)host->dev_timings,
sizeof(*host->dev_timings));
if (ret) {
dev_info(&pdev->dev, "No timings in dts specified, using default timings!\n");
pdata->nand_timings = NULL;
host->dev_timings = NULL;
}
/* Set default NAND bank to 0 */
pdata->bank = 0;
host->bank = 0;
if (!of_property_read_u32(np, "bank", &val)) {
if (val > 3) {
dev_err(&pdev->dev, "invalid bank %u\n", val);
return -EINVAL;
}
pdata->bank = val;
host->bank = val;
}
return 0;
}
@ -847,8 +828,6 @@ static int fsmc_nand_probe_config_dt(struct platform_device *pdev,
*/
static int __init fsmc_nand_probe(struct platform_device *pdev)
{
struct fsmc_nand_platform_data *pdata = dev_get_platdata(&pdev->dev);
struct device_node __maybe_unused *np = pdev->dev.of_node;
struct fsmc_nand_data *host;
struct mtd_info *mtd;
struct nand_chip *nand;
@ -858,22 +837,17 @@ static int __init fsmc_nand_probe(struct platform_device *pdev)
u32 pid;
int i;
pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
if (!pdata)
return -ENOMEM;
pdev->dev.platform_data = pdata;
ret = fsmc_nand_probe_config_dt(pdev, np);
if (ret) {
dev_err(&pdev->dev, "no platform data\n");
return -ENODEV;
}
/* Allocate memory for the device structure (and zero it) */
host = devm_kzalloc(&pdev->dev, sizeof(*host), GFP_KERNEL);
if (!host)
return -ENOMEM;
nand = &host->nand;
ret = fsmc_nand_probe_config_dt(pdev, host, nand);
if (ret)
return ret;
res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "nand_data");
host->data_va = devm_ioremap_resource(&pdev->dev, res);
if (IS_ERR(host->data_va))
@ -918,19 +892,15 @@ static int __init fsmc_nand_probe(struct platform_device *pdev)
AMBA_PART_BITS(pid), AMBA_MANF_BITS(pid),
AMBA_REV_BITS(pid), AMBA_CONFIG_BITS(pid));
host->bank = pdata->bank;
host->dev = &pdev->dev;
host->dev_timings = pdata->nand_timings;
host->mode = pdata->mode;
if (host->mode == USE_DMA_ACCESS)
init_completion(&host->dma_access_complete);
/* Link all private pointers */
mtd = nand_to_mtd(&host->nand);
nand = &host->nand;
nand_set_controller_data(nand, host);
nand_set_flash_node(nand, np);
nand_set_flash_node(nand, pdev->dev.of_node);
mtd->dev.parent = &pdev->dev;
nand->IO_ADDR_R = host->data_va;
@ -945,7 +915,6 @@ static int __init fsmc_nand_probe(struct platform_device *pdev)
nand->ecc.mode = NAND_ECC_HW;
nand->ecc.hwctl = fsmc_enable_hwecc;
nand->ecc.size = 512;
nand->options = pdata->options;
nand->badblockbits = 7;
switch (host->mode) {