forked from luck/tmp_suning_uos_patched
mmc: atmel-mci: add device tree support
Signed-off-by: Ludovic Desroches <ludovic.desroches@atmel.com> Acked-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com> Signed-off-by: Chris Ball <cjb@laptop.org>
This commit is contained in:
Ludovic Desroches
Chris Ball
parent
77dcb3f4c3
commit
e919fd2000
68
Documentation/devicetree/bindings/mmc/atmel-hsmci.txt
Normal file
68
Documentation/devicetree/bindings/mmc/atmel-hsmci.txt
Normal file
@ -0,0 +1,68 @@
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* Atmel High Speed MultiMedia Card Interface
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This controller on atmel products provides an interface for MMC, SD and SDIO
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types of memory cards.
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This file documents differences between the core properties described
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by mmc.txt and the properties used by the atmel-mci driver.
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1) MCI node
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Required properties:
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- compatible: should be "atmel,hsmci"
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- #address-cells: should be one. The cell is the slot id.
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- #size-cells: should be zero.
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- at least one slot node
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The node contains child nodes for each slot that the platform uses
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Example MCI node:
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mmc0: mmc@f0008000 {
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compatible = "atmel,hsmci";
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reg = <0xf0008000 0x600>;
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interrupts = <12 4>;
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#address-cells = <1>;
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#size-cells = <0>;
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[ child node definitions...]
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};
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2) slot nodes
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Required properties:
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- reg: should contain the slot id.
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- bus-width: number of data lines connected to the controller
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Optional properties:
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- cd-gpios: specify GPIOs for card detection
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- cd-inverted: invert the value of external card detect gpio line
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- wp-gpios: specify GPIOs for write protection
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Example slot node:
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slot@0 {
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reg = <0>;
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bus-width = <4>;
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cd-gpios = <&pioD 15 0>
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cd-inverted;
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};
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Example full MCI node:
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mmc0: mmc@f0008000 {
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compatible = "atmel,hsmci";
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reg = <0xf0008000 0x600>;
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interrupts = <12 4>;
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#address-cells = <1>;
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#size-cells = <0>;
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slot@0 {
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reg = <0>;
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bus-width = <4>;
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cd-gpios = <&pioD 15 0>
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cd-inverted;
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};
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slot@1 {
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reg = <1>;
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bus-width = <4>;
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};
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};
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@ -19,6 +19,9 @@
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#include <linux/interrupt.h>
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#include <linux/ioport.h>
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#include <linux/module.h>
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#include <linux/of.h>
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#include <linux/of_device.h>
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#include <linux/of_gpio.h>
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#include <linux/platform_device.h>
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#include <linux/scatterlist.h>
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#include <linux/seq_file.h>
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@ -500,6 +503,70 @@ static void atmci_init_debugfs(struct atmel_mci_slot *slot)
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dev_err(&mmc->class_dev, "failed to initialize debugfs for slot\n");
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}
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#if defined(CONFIG_OF)
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static const struct of_device_id atmci_dt_ids[] = {
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{ .compatible = "atmel,hsmci" },
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{ /* sentinel */ }
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};
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MODULE_DEVICE_TABLE(of, atmci_dt_ids);
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static struct mci_platform_data __devinit*
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atmci_of_init(struct platform_device *pdev)
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{
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struct device_node *np = pdev->dev.of_node;
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struct device_node *cnp;
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struct mci_platform_data *pdata;
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u32 slot_id;
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if (!np) {
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dev_err(&pdev->dev, "device node not found\n");
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return ERR_PTR(-EINVAL);
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}
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pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
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if (!pdata) {
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dev_err(&pdev->dev, "could not allocate memory for pdata\n");
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return ERR_PTR(-ENOMEM);
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}
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for_each_child_of_node(np, cnp) {
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if (of_property_read_u32(cnp, "reg", &slot_id)) {
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dev_warn(&pdev->dev, "reg property is missing for %s\n",
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cnp->full_name);
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continue;
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}
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if (slot_id >= ATMCI_MAX_NR_SLOTS) {
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dev_warn(&pdev->dev, "can't have more than %d slots\n",
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ATMCI_MAX_NR_SLOTS);
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break;
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}
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if (of_property_read_u32(cnp, "bus-width",
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&pdata->slot[slot_id].bus_width))
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pdata->slot[slot_id].bus_width = 1;
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pdata->slot[slot_id].detect_pin =
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of_get_named_gpio(cnp, "cd-gpios", 0);
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pdata->slot[slot_id].detect_is_active_high =
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of_property_read_bool(cnp, "cd-inverted");
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pdata->slot[slot_id].wp_pin =
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of_get_named_gpio(cnp, "wp-gpios", 0);
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}
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return pdata;
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}
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#else /* CONFIG_OF */
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static inline struct mci_platform_data*
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atmci_of_init(struct platform_device *dev)
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{
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return ERR_PTR(-EINVAL);
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}
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#endif
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static inline unsigned int atmci_get_version(struct atmel_mci *host)
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{
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return atmci_readl(host, ATMCI_VERSION) & 0x00000fff;
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@ -2046,6 +2113,13 @@ static int __init atmci_init_slot(struct atmel_mci *host,
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slot->sdc_reg = sdc_reg;
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slot->sdio_irq = sdio_irq;
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dev_dbg(&mmc->class_dev,
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"slot[%u]: bus_width=%u, detect_pin=%d, "
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"detect_is_active_high=%s, wp_pin=%d\n",
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id, slot_data->bus_width, slot_data->detect_pin,
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slot_data->detect_is_active_high ? "true" : "false",
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slot_data->wp_pin);
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mmc->ops = &atmci_ops;
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mmc->f_min = DIV_ROUND_UP(host->bus_hz, 512);
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mmc->f_max = host->bus_hz / 2;
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@ -2268,8 +2342,14 @@ static int __init atmci_probe(struct platform_device *pdev)
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if (!regs)
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return -ENXIO;
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pdata = pdev->dev.platform_data;
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if (!pdata)
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return -ENXIO;
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if (!pdata) {
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pdata = atmci_of_init(pdev);
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if (IS_ERR(pdata)) {
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dev_err(&pdev->dev, "platform data not available\n");
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return PTR_ERR(pdata);
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}
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}
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irq = platform_get_irq(pdev, 0);
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if (irq < 0)
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return irq;
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@ -2487,6 +2567,7 @@ static struct platform_driver atmci_driver = {
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.driver = {
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.name = "atmel_mci",
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.pm = ATMCI_PM_OPS,
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.of_match_table = of_match_ptr(atmci_dt_ids),
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},
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};
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