forked from Minki/linux
mtd: add device-tree support to spear_smi
This patch adds support to configure the SPEAr SMI driver via device-tree instead of platform_data. Signed-off-by: Stefan Roese <sr@denx.de> Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com> Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
This commit is contained in:
Stefan Roese
David Woodhouse
parent
f7e3dd8f48
commit
6551ab5d30
31
Documentation/devicetree/bindings/mtd/spear_smi.txt
Normal file
31
Documentation/devicetree/bindings/mtd/spear_smi.txt
Normal file
@ -0,0 +1,31 @@
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* SPEAr SMI
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Required properties:
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- compatible : "st,spear600-smi"
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- reg : Address range of the mtd chip
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- #address-cells, #size-cells : Must be present if the device has sub-nodes
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representing partitions.
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- interrupt-parent: Should be the phandle for the interrupt controller
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that services interrupts for this device
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- interrupts: Should contain the STMMAC interrupts
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- clock-rate : Functional clock rate of SMI in Hz
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Optional properties:
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- st,smi-fast-mode : Flash supports read in fast mode
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Example:
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smi: flash@fc000000 {
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compatible = "st,spear600-smi";
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#address-cells = <1>;
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#size-cells = <1>;
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reg = <0xfc000000 0x1000>;
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interrupt-parent = <&vic1>;
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interrupts = <12>;
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clock-rate = <50000000>; /* 50MHz */
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flash@f8000000 {
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st,smi-fast-mode;
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...
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};
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};
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@ -33,9 +33,8 @@
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#include <linux/sched.h>
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#include <linux/slab.h>
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#include <linux/wait.h>
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/* max possible slots for serial-nor flash chip in the SMI controller */
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#define MAX_NUM_FLASH_CHIP 4
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#include <linux/of.h>
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#include <linux/of_address.h>
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/* SMI clock rate */
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#define SMI_MAX_CLOCK_FREQ 50000000 /* 50 MHz */
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@ -748,9 +747,63 @@ err_probe:
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return ret;
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}
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static int spear_smi_setup_banks(struct platform_device *pdev, u32 bank)
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#ifdef CONFIG_OF
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static int __devinit spear_smi_probe_config_dt(struct platform_device *pdev,
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struct device_node *np)
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{
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struct spear_smi_plat_data *pdata = dev_get_platdata(&pdev->dev);
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struct device_node *pp = NULL;
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const __be32 *addr;
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u32 val;
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int len;
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int i = 0;
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if (!np)
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return -ENODEV;
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of_property_read_u32(np, "clock-rate", &val);
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pdata->clk_rate = val;
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pdata->board_flash_info = devm_kzalloc(&pdev->dev,
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sizeof(*pdata->board_flash_info),
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GFP_KERNEL);
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/* Fill structs for each subnode (flash device) */
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while ((pp = of_get_next_child(np, pp))) {
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struct spear_smi_flash_info *flash_info;
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flash_info = &pdata->board_flash_info[i];
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pdata->np[i] = pp;
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/* Read base-addr and size from DT */
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addr = of_get_property(pp, "reg", &len);
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pdata->board_flash_info->mem_base = be32_to_cpup(&addr[0]);
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pdata->board_flash_info->size = be32_to_cpup(&addr[1]);
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if (of_get_property(pp, "st,smi-fast-mode", NULL))
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pdata->board_flash_info->fast_mode = 1;
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i++;
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}
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pdata->num_flashes = i;
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return 0;
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}
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#else
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static int __devinit spear_smi_probe_config_dt(struct platform_device *pdev,
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struct device_node *np)
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{
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return -ENOSYS;
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}
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#endif
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static int spear_smi_setup_banks(struct platform_device *pdev,
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u32 bank, struct device_node *np)
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{
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struct spear_smi *dev = platform_get_drvdata(pdev);
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struct mtd_part_parser_data ppdata = {};
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struct spear_smi_flash_info *flash_info;
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struct spear_smi_plat_data *pdata;
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struct spear_snor_flash *flash;
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@ -816,11 +869,16 @@ static int spear_smi_setup_banks(struct platform_device *pdev, u32 bank)
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dev_info(&dev->pdev->dev, ".erasesize = 0x%x(%uK)\n",
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flash->mtd.erasesize, flash->mtd.erasesize / 1024);
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#ifndef CONFIG_OF
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if (flash_info->partitions) {
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parts = flash_info->partitions;
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count = flash_info->nr_partitions;
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}
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ret = mtd_device_parse_register(&flash->mtd, NULL, NULL, parts, count);
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#endif
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ppdata.of_node = np;
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ret = mtd_device_parse_register(&flash->mtd, NULL, &ppdata, parts,
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count);
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if (ret) {
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dev_err(&dev->pdev->dev, "Err MTD partition=%d\n", ret);
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goto err_map;
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@ -847,18 +905,35 @@ err_probe:
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*/
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static int __devinit spear_smi_probe(struct platform_device *pdev)
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{
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struct spear_smi_plat_data *pdata;
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struct device_node *np = pdev->dev.of_node;
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struct spear_smi_plat_data *pdata = NULL;
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struct spear_smi *dev;
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struct resource *smi_base;
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int irq, ret = 0;
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int i;
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if (np) {
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pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
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if (!pdata) {
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pr_err("%s: ERROR: no memory", __func__);
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ret = -ENOMEM;
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goto err;
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}
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pdev->dev.platform_data = pdata;
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ret = spear_smi_probe_config_dt(pdev, np);
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if (ret) {
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ret = -ENODEV;
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dev_err(&pdev->dev, "no platform data\n");
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goto err;
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}
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} else {
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pdata = dev_get_platdata(&pdev->dev);
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if (pdata < 0) {
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ret = -ENODEV;
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dev_err(&pdev->dev, "no platform data\n");
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goto err;
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}
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}
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smi_base = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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if (!smi_base) {
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@ -932,7 +1007,7 @@ static int __devinit spear_smi_probe(struct platform_device *pdev)
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/* loop for each serial nor-flash which is connected to smi */
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for (i = 0; i < dev->num_flashes; i++) {
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ret = spear_smi_setup_banks(pdev, i);
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ret = spear_smi_setup_banks(pdev, i, pdata->np[i]);
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if (ret) {
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dev_err(&dev->pdev->dev, "bank setup failed\n");
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goto err_bank_setup;
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@ -967,6 +1042,7 @@ err:
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static int __devexit spear_smi_remove(struct platform_device *pdev)
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{
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struct spear_smi *dev;
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struct spear_smi_plat_data *pdata;
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struct spear_snor_flash *flash;
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struct resource *smi_base;
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int ret;
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@ -978,6 +1054,8 @@ static int __devexit spear_smi_remove(struct platform_device *pdev)
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return -ENODEV;
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}
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pdata = dev_get_platdata(&pdev->dev);
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/* clean up for all nor flash */
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for (i = 0; i < dev->num_flashes; i++) {
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flash = dev->flash[i];
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@ -1031,11 +1109,20 @@ int spear_smi_resume(struct platform_device *pdev)
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return ret;
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}
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#ifdef CONFIG_OF
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static const struct of_device_id spear_smi_id_table[] = {
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{ .compatible = "st,spear600-smi" },
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{}
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};
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MODULE_DEVICE_TABLE(of, spear_smi_id_table);
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#endif
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static struct platform_driver spear_smi_driver = {
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.driver = {
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.name = "smi",
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.bus = &platform_bus_type,
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.owner = THIS_MODULE,
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.of_match_table = of_match_ptr(spear_smi_id_table),
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},
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.probe = spear_smi_probe,
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.remove = __devexit_p(spear_smi_remove),
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@ -14,6 +14,10 @@
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#include <linux/mtd/mtd.h>
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#include <linux/mtd/partitions.h>
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#include <linux/platform_device.h>
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#include <linux/of.h>
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/* max possible slots for serial-nor flash chip in the SMI controller */
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#define MAX_NUM_FLASH_CHIP 4
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/* macro to define partitions for flash devices */
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#define DEFINE_PARTS(n, of, s) \
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@ -55,6 +59,7 @@ struct spear_smi_plat_data {
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unsigned long clk_rate;
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int num_flashes;
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struct spear_smi_flash_info *board_flash_info;
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struct device_node *np[MAX_NUM_FLASH_CHIP];
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};
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#endif /* __MTD_SPEAR_SMI_H */
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