mmc: dw_mmc: add device tree support
Add device tree based discovery support. Signed-off-by: Thomas Abraham <thomas.abraham@linaro.org> Acked-by: Will Newton <will.newton@imgtec.com> Signed-off-by: Chris Ball <cjb@laptop.org>
This commit is contained in:
Thomas Abraham
Chris Ball
parent
b4967aa58e
commit
c91eab4b25
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@ -0,0 +1,79 @@
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* Synopsis Designware Mobile Storage Host Controller
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The Synopsis designware mobile storage host controller is used to interface
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a SoC with storage medium such as eMMC or SD/MMC cards. This file documents
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differences between the core mmc properties described by mmc.txt and the
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properties used by the Synopsis Designware Mobile Storage Host Controller.
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Required Properties:
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* compatible: should be
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- snps,dw-mshc: for controllers compliant with synopsis dw-mshc.
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* #address-cells: should be 1.
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* #size-cells: should be 0.
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# Slots: The slot specific information are contained within child-nodes with
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each child-node representing a supported slot. There should be atleast one
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child node representing a card slot. The name of the child node representing
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the slot is recommended to be slot@n where n is the unique number of the slot
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connnected to the controller. The following are optional properties which
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can be included in the slot child node.
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* reg: specifies the physical slot number. The valid values of this
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property is 0 to (num-slots -1), where num-slots is the value
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specified by the num-slots property.
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* bus-width: as documented in mmc core bindings.
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* wp-gpios: specifies the write protect gpio line. The format of the
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gpio specifier depends on the gpio controller. If the write-protect
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line is not available, this property is optional.
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Optional properties:
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* num-slots: specifies the number of slots supported by the controller.
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The number of physical slots actually used could be equal or less than the
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value specified by num-slots. If this property is not specified, the value
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of num-slot property is assumed to be 1.
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* fifo-depth: The maximum size of the tx/rx fifo's. If this property is not
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specified, the default value of the fifo size is determined from the
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controller registers.
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* card-detect-delay: Delay in milli-seconds before detecting card after card
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insert event. The default value is 0.
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* supports-highspeed: Enables support for high speed cards (upto 50MHz)
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* broken-cd: as documented in mmc core bindings.
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Aliases:
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- All the MSHC controller nodes should be represented in the aliases node using
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the following format 'mshc{n}' where n is a unique number for the alias.
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Example:
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The MSHC controller node can be split into two portions, SoC specific and
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board specific portions as listed below.
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dwmmc0@12200000 {
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compatible = "snps,dw-mshc";
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reg = <0x12200000 0x1000>;
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interrupts = <0 75 0>;
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#address-cells = <1>;
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#size-cells = <0>;
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};
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dwmmc0@12200000 {
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num-slots = <1>;
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supports-highspeed;
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broken-cd;
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fifo-depth = <0x80>;
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card-detect-delay = <200>;
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slot@0 {
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reg = <0>;
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bus-width = <8>;
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};
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};
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@ -19,6 +19,8 @@
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#include <linux/mmc/host.h>
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#include <linux/mmc/mmc.h>
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#include <linux/mmc/dw_mmc.h>
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#include <linux/of.h>
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#include "dw_mmc.h"
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static int __devinit dw_mci_pltfm_probe(struct platform_device *pdev)
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@ -94,10 +96,17 @@ static int dw_mci_pltfm_resume(struct device *dev)
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static SIMPLE_DEV_PM_OPS(dw_mci_pltfm_pmops, dw_mci_pltfm_suspend, dw_mci_pltfm_resume);
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static const struct of_device_id dw_mci_pltfm_match[] = {
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{ .compatible = "snps,dw-mshc", },
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{},
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};
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MODULE_DEVICE_TABLE(of, dw_mci_pltfm_match);
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static struct platform_driver dw_mci_pltfm_driver = {
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.remove = __exit_p(dw_mci_pltfm_remove),
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.driver = {
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.name = "dw_mmc",
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.of_match_table = of_match_ptr(dw_mci_pltfm_match),
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.pm = &dw_mci_pltfm_pmops,
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},
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};
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@ -33,6 +33,7 @@
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#include <linux/bitops.h>
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#include <linux/regulator/consumer.h>
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#include <linux/workqueue.h>
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#include <linux/of.h>
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#include "dw_mmc.h"
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@ -1769,10 +1770,57 @@ static void dw_mci_work_routine_card(struct work_struct *work)
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}
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}
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#ifdef CONFIG_OF
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/* given a slot id, find out the device node representing that slot */
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static struct device_node *dw_mci_of_find_slot_node(struct device *dev, u8 slot)
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{
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struct device_node *np;
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const __be32 *addr;
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int len;
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if (!dev || !dev->of_node)
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return NULL;
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for_each_child_of_node(dev->of_node, np) {
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addr = of_get_property(np, "reg", &len);
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if (!addr || (len < sizeof(int)))
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continue;
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if (be32_to_cpup(addr) == slot)
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return np;
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}
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return NULL;
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}
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/* find out bus-width for a given slot */
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static u32 dw_mci_of_get_bus_wd(struct device *dev, u8 slot)
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{
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struct device_node *np = dw_mci_of_find_slot_node(dev, slot);
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u32 bus_wd = 1;
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if (!np)
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return 1;
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if (of_property_read_u32(np, "bus-width", &bus_wd))
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dev_err(dev, "bus-width property not found, assuming width"
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" as 1\n");
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return bus_wd;
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}
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#else /* CONFIG_OF */
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static u32 dw_mci_of_get_bus_wd(struct device *dev, u8 slot)
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{
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return 1;
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}
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static struct device_node *dw_mci_of_find_slot_node(struct device *dev, u8 slot)
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{
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return NULL;
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}
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#endif /* CONFIG_OF */
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static int dw_mci_init_slot(struct dw_mci *host, unsigned int id)
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{
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struct mmc_host *mmc;
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struct dw_mci_slot *slot;
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u8 bus_width;
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mmc = mmc_alloc_host(sizeof(struct dw_mci_slot), host->dev);
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if (!mmc)
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@ -1782,6 +1830,7 @@ static int dw_mci_init_slot(struct dw_mci *host, unsigned int id)
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slot->id = id;
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slot->mmc = mmc;
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slot->host = host;
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host->slot[id] = slot;
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mmc->ops = &dw_mci_ops;
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mmc->f_min = DIV_ROUND_UP(host->bus_hz, 510);
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@ -1806,8 +1855,18 @@ static int dw_mci_init_slot(struct dw_mci *host, unsigned int id)
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mmc->caps2 = host->pdata->caps2;
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if (host->pdata->get_bus_wd)
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if (host->pdata->get_bus_wd(slot->id) >= 4)
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mmc->caps |= MMC_CAP_4_BIT_DATA;
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bus_width = host->pdata->get_bus_wd(slot->id);
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else if (host->dev->of_node)
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bus_width = dw_mci_of_get_bus_wd(host->dev, slot->id);
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else
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bus_width = 1;
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switch (bus_width) {
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case 8:
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mmc->caps |= MMC_CAP_8_BIT_DATA;
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case 4:
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mmc->caps |= MMC_CAP_4_BIT_DATA;
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}
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if (host->pdata->quirks & DW_MCI_QUIRK_HIGHSPEED)
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mmc->caps |= MMC_CAP_SD_HIGHSPEED | MMC_CAP_MMC_HIGHSPEED;
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@ -1852,7 +1911,6 @@ static int dw_mci_init_slot(struct dw_mci *host, unsigned int id)
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else
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clear_bit(DW_MMC_CARD_PRESENT, &slot->flags);
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host->slot[id] = slot;
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mmc_add_host(mmc);
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#if defined(CONFIG_DEBUG_FS)
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@ -1944,16 +2002,74 @@ static bool mci_wait_reset(struct device *dev, struct dw_mci *host)
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return false;
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}
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#ifdef CONFIG_OF
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static struct dw_mci_of_quirks {
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char *quirk;
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int id;
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} of_quirks[] = {
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{
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.quirk = "supports-highspeed",
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.id = DW_MCI_QUIRK_HIGHSPEED,
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}, {
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.quirk = "broken-cd",
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.id = DW_MCI_QUIRK_BROKEN_CARD_DETECTION,
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},
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};
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static struct dw_mci_board *dw_mci_parse_dt(struct dw_mci *host)
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{
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struct dw_mci_board *pdata;
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struct device *dev = host->dev;
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struct device_node *np = dev->of_node;
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int idx;
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pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
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if (!pdata) {
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dev_err(dev, "could not allocate memory for pdata\n");
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return ERR_PTR(-ENOMEM);
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}
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/* find out number of slots supported */
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if (of_property_read_u32(dev->of_node, "num-slots",
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&pdata->num_slots)) {
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dev_info(dev, "num-slots property not found, "
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"assuming 1 slot is available\n");
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pdata->num_slots = 1;
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}
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/* get quirks */
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for (idx = 0; idx < ARRAY_SIZE(of_quirks); idx++)
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if (of_get_property(np, of_quirks[idx].quirk, NULL))
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pdata->quirks |= of_quirks[idx].id;
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if (of_property_read_u32(np, "fifo-depth", &pdata->fifo_depth))
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dev_info(dev, "fifo-depth property not found, using "
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"value of FIFOTH register as default\n");
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of_property_read_u32(np, "card-detect-delay", &pdata->detect_delay_ms);
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return pdata;
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}
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#else /* CONFIG_OF */
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static struct dw_mci_board *dw_mci_parse_dt(struct dw_mci *host)
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{
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return ERR_PTR(-EINVAL);
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}
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#endif /* CONFIG_OF */
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int dw_mci_probe(struct dw_mci *host)
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{
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int width, i, ret = 0;
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u32 fifo_size;
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int init_slots = 0;
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if (!host->pdata || !host->pdata->init) {
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dev_err(host->dev,
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"Platform data must supply init function\n");
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return -ENODEV;
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if (!host->pdata) {
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host->pdata = dw_mci_parse_dt(host);
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if (IS_ERR(host->pdata)) {
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dev_err(host->dev, "platform data not available\n");
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return -EINVAL;
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}
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}
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if (!host->pdata->select_slot && host->pdata->num_slots > 1) {
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