From c91eab4b2564f2424268113ab348eacf9381c2d9 Mon Sep 17 00:00:00 2001 From: Thomas Abraham Date: Mon, 17 Sep 2012 18:16:40 +0000 Subject: mmc: dw_mmc: add device tree support Add device tree based discovery support. Signed-off-by: Thomas Abraham Acked-by: Will Newton Signed-off-by: Chris Ball --- drivers/mmc/host/dw_mmc-pltfm.c | 9 +++ drivers/mmc/host/dw_mmc.c | 130 +++++++++++++++++++++++++++++++++++++--- 2 files changed, 132 insertions(+), 7 deletions(-) (limited to 'drivers/mmc') diff --git a/drivers/mmc/host/dw_mmc-pltfm.c b/drivers/mmc/host/dw_mmc-pltfm.c index ce7be1ac6621..72059050540f 100644 --- a/drivers/mmc/host/dw_mmc-pltfm.c +++ b/drivers/mmc/host/dw_mmc-pltfm.c @@ -19,6 +19,8 @@ #include #include #include +#include + #include "dw_mmc.h" static int __devinit dw_mci_pltfm_probe(struct platform_device *pdev) @@ -94,10 +96,17 @@ static int dw_mci_pltfm_resume(struct device *dev) static SIMPLE_DEV_PM_OPS(dw_mci_pltfm_pmops, dw_mci_pltfm_suspend, dw_mci_pltfm_resume); +static const struct of_device_id dw_mci_pltfm_match[] = { + { .compatible = "snps,dw-mshc", }, + {}, +}; +MODULE_DEVICE_TABLE(of, dw_mci_pltfm_match); + static struct platform_driver dw_mci_pltfm_driver = { .remove = __exit_p(dw_mci_pltfm_remove), .driver = { .name = "dw_mmc", + .of_match_table = of_match_ptr(dw_mci_pltfm_match), .pm = &dw_mci_pltfm_pmops, }, }; diff --git a/drivers/mmc/host/dw_mmc.c b/drivers/mmc/host/dw_mmc.c index 455a155406bc..c792466fb8ac 100644 --- a/drivers/mmc/host/dw_mmc.c +++ b/drivers/mmc/host/dw_mmc.c @@ -33,6 +33,7 @@ #include #include #include +#include #include "dw_mmc.h" @@ -1769,10 +1770,57 @@ static void dw_mci_work_routine_card(struct work_struct *work) } } +#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; } +#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) { - 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) { -- cgit v1.2.2