[PATCH v6 6/9] mmc: dw_mmc: add device tree support
Thomas Abraham
thomas.abraham at linaro.org
Thu Sep 20 14:36:53 EST 2012
On 19 September 2012 19:09, Seungwon Jeon <tgih.jun at samsung.com> wrote:
> On Tuesday, September 18, 2012, Thomas Abraham <thomas.abraham at linaro.org> wrote:
>> +#ifdef CONFIG_OF
>> +/* given a slot id, find out the device node representing that slot */
>> +static struct device_node *dw_mci_of_find_slot_node(struct device *dev, u8 slot)
>> +{
>> + struct device_node *np;
>> + const __be32 *addr;
>> + int len;
>> +
>> + if (!dev || !dev->of_node)
>> + return NULL;
>> +
>> + for_each_child_of_node(dev->of_node, np) {
>> + addr = of_get_property(np, "reg", &len);
>> + if (!addr || (len < sizeof(int)))
>> + continue;
>> + if (be32_to_cpup(addr) == slot)
>> + return np;
>> + }
>> + return NULL;
>> +}
>> +
>> +/* find out bus-width for a given slot */
>> +static u32 dw_mci_of_get_bus_wd(struct device *dev, u8 slot)
>> +{
>> + struct device_node *np = dw_mci_of_find_slot_node(dev, slot);
>> + u32 bus_wd = 1;
>> +
>> + if (!np)
>> + return 1;
>> +
>> + if (of_property_read_u32(np, "bus-width", &bus_wd))
>> + dev_err(dev, "bus-width property not found, assuming width"
>> + " as 1\n");
>> + return bus_wd;
>> +}
>> +#else /* CONFIG_OF */
>> +static u32 dw_mci_of_get_bus_wd(struct device *dev, u8 slot)
>> +{
>> + return 1;
>> +}
>> +static struct device_node *dw_mci_of_find_slot_node(struct device *dev, u8 slot)
>> +{
>> + return NULL;
>> +}
>> +#endif /* CONFIG_OF */
>> +
>> static int dw_mci_init_slot(struct dw_mci *host, unsigned int id)
>> {
>> struct mmc_host *mmc;
>> struct dw_mci_slot *slot;
>> + u8 bus_width;
>>
>> mmc = mmc_alloc_host(sizeof(struct dw_mci_slot), host->dev);
>> if (!mmc)
>> @@ -1782,6 +1830,7 @@ static int dw_mci_init_slot(struct dw_mci *host, unsigned int id)
>> slot->id = id;
>> slot->mmc = mmc;
>> slot->host = host;
>> + host->slot[id] = slot;
>>
>> mmc->ops = &dw_mci_ops;
>> mmc->f_min = DIV_ROUND_UP(host->bus_hz, 510);
>> @@ -1806,8 +1855,18 @@ static int dw_mci_init_slot(struct dw_mci *host, unsigned int id)
>> mmc->caps2 = host->pdata->caps2;
>>
>> if (host->pdata->get_bus_wd)
>> - if (host->pdata->get_bus_wd(slot->id) >= 4)
>> - mmc->caps |= MMC_CAP_4_BIT_DATA;
>> + bus_width = host->pdata->get_bus_wd(slot->id);
>> + else if (host->dev->of_node)
>> + bus_width = dw_mci_of_get_bus_wd(host->dev, slot->id);
>> + else
>> + bus_width = 1;
>> +
>> + switch (bus_width) {
>> + case 8:
>> + mmc->caps |= MMC_CAP_8_BIT_DATA;
>> + case 4:
>> + mmc->caps |= MMC_CAP_4_BIT_DATA;
>> + }
>>
>> if (host->pdata->quirks & DW_MCI_QUIRK_HIGHSPEED)
>> mmc->caps |= MMC_CAP_SD_HIGHSPEED | MMC_CAP_MMC_HIGHSPEED;
>> @@ -1852,7 +1911,6 @@ static int dw_mci_init_slot(struct dw_mci *host, unsigned int id)
>> else
>> clear_bit(DW_MMC_CARD_PRESENT, &slot->flags);
>>
>> - host->slot[id] = slot;
>> mmc_add_host(mmc);
>>
>> #if defined(CONFIG_DEBUG_FS)
>> @@ -1944,16 +2002,74 @@ static bool mci_wait_reset(struct device *dev, struct dw_mci *host)
>> return false;
>> }
>>
> The following CONFIG_OF block can be put together in upper CONFIG_OF .
The placement of device tree related code is considering the logical
structure and flow of the code. So maybe we can just retain the below
code here for now.
>
>> +#ifdef CONFIG_OF
>> +static struct dw_mci_of_quirks {
>> + char *quirk;
>> + int id;
>> +} of_quirks[] = {
>> + {
>> + .quirk = "supports-highspeed",
>> + .id = DW_MCI_QUIRK_HIGHSPEED,
>> + }, {
>> + .quirk = "broken-cd",
>> + .id = DW_MCI_QUIRK_BROKEN_CARD_DETECTION,
>> + },
>> +};
>> +
>> +static struct dw_mci_board *dw_mci_parse_dt(struct dw_mci *host)
>> +{
>> + struct dw_mci_board *pdata;
>> + struct device *dev = host->dev;
>> + struct device_node *np = dev->of_node;
>> + int idx;
>> +
>> + pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
>> + if (!pdata) {
>> + dev_err(dev, "could not allocate memory for pdata\n");
>> + return ERR_PTR(-ENOMEM);
>> + }
>> +
>> + /* find out number of slots supported */
>> + if (of_property_read_u32(dev->of_node, "num-slots",
>> + &pdata->num_slots)) {
>> + dev_info(dev, "num-slots property not found, "
>> + "assuming 1 slot is available\n");
>> + pdata->num_slots = 1;
>> + }
>> +
>> + /* get quirks */
>> + for (idx = 0; idx < ARRAY_SIZE(of_quirks); idx++)
>> + if (of_get_property(np, of_quirks[idx].quirk, NULL))
>> + pdata->quirks |= of_quirks[idx].id;
>> +
>> + if (of_property_read_u32(np, "fifo-depth", &pdata->fifo_depth))
>> + dev_info(dev, "fifo-depth property not found, using "
>> + "value of FIFOTH register as default\n");
>> +
>> + of_property_read_u32(np, "card-detect-delay", &pdata->detect_delay_ms);
>> +
>> + return pdata;
>> +}
>> +
>> +#else /* CONFIG_OF */
>> +static struct dw_mci_board *dw_mci_parse_dt(struct dw_mci *host)
>> +{
>> + return ERR_PTR(-EINVAL);
>> +}
>> +#endif /* CONFIG_OF */
>> +
>> int dw_mci_probe(struct dw_mci *host)
>> {
>> int width, i, ret = 0;
>> u32 fifo_size;
>> int init_slots = 0;
>>
>> - if (!host->pdata || !host->pdata->init) {
> "!host->pdata->init" is removed.
> Please check it.
I have checked again in mmc-next branch and "init" is still there.
Thanks,
Thomas.
>
> Thanks,
> Seungwon Jeon
>
>> - dev_err(host->dev,
>> - "Platform data must supply init function\n");
>> - return -ENODEV;
>> + if (!host->pdata) {
>> + host->pdata = dw_mci_parse_dt(host);
>> + if (IS_ERR(host->pdata)) {
>> + dev_err(host->dev, "platform data not available\n");
>> + return -EINVAL;
>> + }
>> }
>>
>> if (!host->pdata->select_slot && host->pdata->num_slots > 1) {
>> --
>> 1.6.6.rc2
>>
>> --
>> To unsubscribe from this list: send the line "unsubscribe linux-mmc" in
>> the body of a message to majordomo at vger.kernel.org
>> More majordomo info at http://vger.kernel.org/majordomo-info.html
>
[...]
More information about the devicetree-discuss
mailing list