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mmc: tmio: ioremap memory resource in tmio_mmc_host_alloc()

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The register region is ioremap'ed in the tmio_mmc_host_probe(), i.e.
drivers cannot get access to the hardware before mmc_add_host().

Actually, renesas_sdhi_core.c reads out the CTL_VERSION register to
complete the platform-specific settings.  However, at this point,
the MMC host is already running.

Move the register ioremap to tmio_mmc_host_alloc() so that drivers
can perform platform-specific settings between tmio_mmc_host_alloc()
and tmio_mmc_host_probe().

I changed tmio_mmc_host_alloc() to return an error pointer to
propagate the return code from devm_ioremap_resource().

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Reviewed-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
This commit is contained in:
Masahiro Yamada 2018-01-18 01:28:01 +09:00 committed by Ulf Hansson
parent 659032dcb9
commit 8d09a13386
3 changed files with 14 additions and 10 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
drivers/mmc/host/renesas_sdhi_core.c
View File

@ -512,8 +512,8 @@ int renesas_sdhi_probe(struct platform_device *pdev,
}
host = tmio_mmc_host_alloc(pdev);
if (!host)
return -ENOMEM;
if (IS_ERR(host))
return PTR_ERR(host);
if (of_data) {
mmc_data->flags |= of_data->tmio_flags;

4
drivers/mmc/host/tmio_mmc.c
View File

@ -93,8 +93,10 @@ static int tmio_mmc_probe(struct platform_device *pdev)
pdata->flags |= TMIO_MMC_HAVE_HIGH_REG;
host = tmio_mmc_host_alloc(pdev);
if (!host)
if (IS_ERR(host)) {
ret = PTR_ERR(host);
goto cell_disable;
}
/* SD control register space size is 0x200, 0x400 for bus_shift=1 */
host->bus_shift = resource_size(res) >> 10;

16
drivers/mmc/host/tmio_mmc_core.c
View File

@ -1150,12 +1150,20 @@ tmio_mmc_host_alloc(struct platform_device *pdev)
{
struct tmio_mmc_host *host;
struct mmc_host *mmc;
struct resource *res;
void __iomem *ctl;
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
ctl = devm_ioremap_resource(&pdev->dev, res);
if (IS_ERR(ctl))
return ERR_CAST(ctl);
mmc = mmc_alloc_host(sizeof(struct tmio_mmc_host), &pdev->dev);
if (!mmc)
return NULL;
return ERR_PTR(-ENOMEM);
host = mmc_priv(mmc);
host->ctl = ctl;
host->mmc = mmc;
host->pdev = pdev;
host->ops = tmio_mmc_ops;
@ -1177,7 +1185,6 @@ int tmio_mmc_host_probe(struct tmio_mmc_host *_host,
{
struct platform_device *pdev = _host->pdev;
struct mmc_host *mmc = _host->mmc;
struct resource *res_ctl;
int ret;
u32 irq_mask = TMIO_MASK_CMD;
@ -1186,11 +1193,6 @@ int tmio_mmc_host_probe(struct tmio_mmc_host *_host,
if (!(pdata->flags & TMIO_MMC_HAS_IDLE_WAIT))
_host->write16_hook = NULL;
res_ctl = platform_get_resource(pdev, IORESOURCE_MEM, 0);
_host->ctl = devm_ioremap_resource(&pdev->dev, res_ctl);
if (IS_ERR(_host->ctl))
return PTR_ERR(_host->ctl);
ret = mmc_of_parse(mmc);
if (ret < 0)
return ret;