On Tuesday, September 18, 2012, Thomas Abraham <thomas.abra...@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 .
> +#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.
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
>
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