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mmc: omap_hsmmc: Add support for quirky omap3 hsmmc controller

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When device is booted using devicetree, platforms impacted by Erratum
2.1.1.128 is not detected easily in the mmc driver. This erratum
indicates that the module cannot do multi-block transfers. Platforms
such as LDP which use OMAP3 ES revision prior to ES3.0 are impacted by
this.

Provide a new compatible property "ti,omap3-pre-es3-hsmmc" to allow
driver to determine if driver needs to implement quirks associated
with the specific module version (primarily because the IP revision
information is not sufficient for the same).

Signed-off-by: Nishanth Menon <nm@ti.com>
Acked-by: Tony Lindgren <tony@atomide.com>
Acked-by: Balaji T K <balajitk@ti.com>
Signed-off-by: Chris Ball <chris@printf.net>
This commit is contained in:
Nishanth Menon 2014-02-13 23:45:48 -06:00 committed by Chris Ball
parent b38313d627
commit 59445b10d0
2 changed files with 23 additions and 4 deletions
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1
Documentation/devicetree/bindings/mmc/ti-omap-hsmmc.txt
View File

@ -10,6 +10,7 @@ Required properties:
- compatible:
Should be "ti,omap2-hsmmc", for OMAP2 controllers
Should be "ti,omap3-hsmmc", for OMAP3 controllers
Should be "ti,omap3-pre-es3-hsmmc" for OMAP3 controllers pre ES3.0
Should be "ti,omap4-hsmmc", for OMAP4 controllers
- ti,hwmods: Must be "mmc<n>", n is controller instance starting 1

26
drivers/mmc/host/omap_hsmmc.c
View File

@ -192,6 +192,11 @@ struct omap_hsmmc_host {
struct omap_mmc_platform_data *pdata;
};
struct omap_mmc_of_data {
u32 reg_offset;
u8 controller_flags;
};
static int omap_hsmmc_card_detect(struct device *dev, int slot)
{
struct omap_hsmmc_host *host = dev_get_drvdata(dev);
@ -1677,18 +1682,29 @@ static void omap_hsmmc_debugfs(struct mmc_host *mmc)
#endif
#ifdef CONFIG_OF
static u16 omap4_reg_offset = 0x100;
static const struct omap_mmc_of_data omap3_pre_es3_mmc_of_data = {
/* See 35xx errata 2.1.1.128 in SPRZ278F */
.controller_flags = OMAP_HSMMC_BROKEN_MULTIBLOCK_READ,
};
static const struct omap_mmc_of_data omap4_mmc_of_data = {
.reg_offset = 0x100,
};
static const struct of_device_id omap_mmc_of_match[] = {
{
.compatible = "ti,omap2-hsmmc",
},
{
.compatible = "ti,omap3-pre-es3-hsmmc",
.data = &omap3_pre_es3_mmc_of_data,
},
{
.compatible = "ti,omap3-hsmmc",
},
{
.compatible = "ti,omap4-hsmmc",
.data = &omap4_reg_offset,
.data = &omap4_mmc_of_data,
},
{},
};
@ -1758,6 +1774,7 @@ static int omap_hsmmc_probe(struct platform_device *pdev)
dma_cap_mask_t mask;
unsigned tx_req, rx_req;
struct pinctrl *pinctrl;
const struct omap_mmc_of_data *data;
match = of_match_device(of_match_ptr(omap_mmc_of_match), &pdev->dev);
if (match) {
@ -1767,8 +1784,9 @@ static int omap_hsmmc_probe(struct platform_device *pdev)
return PTR_ERR(pdata);
if (match->data) {
const u16 *offsetp = match->data;
pdata->reg_offset = *offsetp;
data = match->data;
pdata->reg_offset = data->reg_offset;
pdata->controller_flags |= data->controller_flags;
}
}