mtd: Add device-tree support to fsmc_nand
This patch adds support to configure the FSMC NAND driver (used amongst others on SPEAr platforms) 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
30053b87d5
commit
eea628199d
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@ -0,0 +1,33 @@
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* FSMC NAND
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Required properties:
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- compatible : "st,spear600-fsmc-nand"
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- reg : Address range of the mtd chip
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- reg-names: Should contain the reg names "fsmc_regs" and "nand_data"
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- st,ale-off : Chip specific offset to ALE
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- st,cle-off : Chip specific offset to CLE
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Optional properties:
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- bank-width : Width (in bytes) of the device. If not present, the width
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defaults to 1 byte
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- nand-skip-bbtscan: Indicates the the BBT scanning should be skipped
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Example:
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fsmc: flash@d1800000 {
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compatible = "st,spear600-fsmc-nand";
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#address-cells = <1>;
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#size-cells = <1>;
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reg = <0xd1800000 0x1000 /* FSMC Register */
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0xd2000000 0x4000>; /* NAND Base */
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reg-names = "fsmc_regs", "nand_data";
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st,ale-off = <0x20000>;
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st,cle-off = <0x10000>;
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bank-width = <1>;
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nand-skip-bbtscan;
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partition@0 {
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...
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};
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};
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@ -31,6 +31,7 @@
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#include <linux/mtd/nand.h>
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#include <linux/mtd/nand_ecc.h>
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#include <linux/platform_device.h>
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#include <linux/of.h>
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#include <linux/mtd/partitions.h>
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#include <linux/io.h>
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#include <linux/slab.h>
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@ -854,6 +855,38 @@ static bool filter(struct dma_chan *chan, void *slave)
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return true;
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}
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#ifdef CONFIG_OF
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static int __devinit fsmc_nand_probe_config_dt(struct platform_device *pdev,
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struct device_node *np)
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{
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struct fsmc_nand_platform_data *pdata = dev_get_platdata(&pdev->dev);
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u32 val;
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/* Set default NAND width to 8 bits */
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pdata->width = 8;
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if (!of_property_read_u32(np, "bank-width", &val)) {
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if (val == 2) {
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pdata->width = 16;
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} else if (val != 1) {
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dev_err(&pdev->dev, "invalid bank-width %u\n", val);
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return -EINVAL;
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}
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}
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of_property_read_u32(np, "st,ale-off", &pdata->ale_off);
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of_property_read_u32(np, "st,cle-off", &pdata->cle_off);
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if (of_get_property(np, "nand-skip-bbtscan", NULL))
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pdata->options = NAND_SKIP_BBTSCAN;
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return 0;
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}
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#else
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static int __devinit fsmc_nand_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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/*
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* fsmc_nand_probe - Probe function
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* @pdev: platform device structure
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@ -861,6 +894,8 @@ static bool filter(struct dma_chan *chan, void *slave)
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static int __init fsmc_nand_probe(struct platform_device *pdev)
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{
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struct fsmc_nand_platform_data *pdata = dev_get_platdata(&pdev->dev);
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struct device_node __maybe_unused *np = pdev->dev.of_node;
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struct mtd_part_parser_data ppdata = {};
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struct fsmc_nand_data *host;
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struct mtd_info *mtd;
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struct nand_chip *nand;
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@ -870,6 +905,16 @@ static int __init fsmc_nand_probe(struct platform_device *pdev)
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u32 pid;
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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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pdev->dev.platform_data = pdata;
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ret = fsmc_nand_probe_config_dt(pdev, np);
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if (ret) {
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dev_err(&pdev->dev, "no platform data\n");
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return -ENODEV;
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}
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}
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if (!pdata) {
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dev_err(&pdev->dev, "platform data is NULL\n");
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return -EINVAL;
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@ -1113,7 +1158,8 @@ static int __init fsmc_nand_probe(struct platform_device *pdev)
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* Check for partition info passed
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*/
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host->mtd.name = "nand";
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ret = mtd_device_parse_register(&host->mtd, NULL, NULL,
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ppdata.of_node = np;
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ret = mtd_device_parse_register(&host->mtd, NULL, &ppdata,
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host->partitions, host->nr_partitions);
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if (ret)
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goto err_probe;
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@ -1183,11 +1229,20 @@ static int fsmc_nand_resume(struct device *dev)
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static SIMPLE_DEV_PM_OPS(fsmc_nand_pm_ops, fsmc_nand_suspend, fsmc_nand_resume);
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#endif
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#ifdef CONFIG_OF
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static const struct of_device_id fsmc_nand_id_table[] = {
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{ .compatible = "st,spear600-fsmc-nand" },
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{}
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};
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MODULE_DEVICE_TABLE(of, fsmc_nand_id_table);
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#endif
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static struct platform_driver fsmc_nand_driver = {
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.remove = fsmc_nand_remove,
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.driver = {
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.owner = THIS_MODULE,
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.name = "fsmc-nand",
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.of_match_table = of_match_ptr(fsmc_nand_id_table),
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#ifdef CONFIG_PM
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.pm = &fsmc_nand_pm_ops,
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#endif
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@ -156,8 +156,8 @@ struct fsmc_nand_platform_data {
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unsigned int bank;
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/* CLE, ALE offsets */
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unsigned long cle_off;
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unsigned long ale_off;
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unsigned int cle_off;
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unsigned int ale_off;
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enum access_mode mode;
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void (*select_bank)(uint32_t bank, uint32_t busw);
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