mirror of https://gitee.com/openkylin/linux.git
mtd: physmap_of: Add multiple regions and concatenation support
This patch adds support to handle multiple non-identical chips in one
flash device tree node. It also adds concat support to physmap_of. This
makes it possible to support e.g. the Intel P30 48F4400 chips which
internally consists of 2 non-identical NOR chips on one die. Additionally
partitions now can span over multiple chips.
To describe such a chip's, multiple "reg" tuples are now supported in one
flash device tree node. Here an dts example:
flash@f0000000,0 {
#address-cells = <1>;
#size-cells = <1>;
compatible = "cfi-flash";
reg = <0 0x00000000 0x02000000
0 0x02000000 0x02000000>;
bank-width = <2>;
partition@0 {
label = "test-part1";
reg = <0 0x04000000>;
};
};
Signed-off-by: Stefan Roese <sr@denx.de>
Reviewed-by: Grant Likely <grant.likely@secretlab.ca>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
This commit is contained in:
Stefan Roese
David Woodhouse
parent
43950a605d
commit
143070e746
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@ -20,16 +20,23 @@
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#include <linux/mtd/mtd.h>
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#include <linux/mtd/map.h>
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#include <linux/mtd/partitions.h>
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#include <linux/mtd/concat.h>
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#include <linux/of.h>
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#include <linux/of_platform.h>
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struct of_flash {
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struct of_flash_list {
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struct mtd_info *mtd;
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struct map_info map;
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struct resource *res;
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};
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struct of_flash {
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struct mtd_info *cmtd;
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#ifdef CONFIG_MTD_PARTITIONS
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struct mtd_partition *parts;
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#endif
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int list_size; /* number of elements in of_flash_list */
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struct of_flash_list list[0];
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};
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#ifdef CONFIG_MTD_PARTITIONS
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@ -88,29 +95,43 @@ static int parse_obsolete_partitions(struct of_device *dev,
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static int of_flash_remove(struct of_device *dev)
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{
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struct of_flash *info;
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int i;
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info = dev_get_drvdata(&dev->dev);
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if (!info)
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return 0;
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dev_set_drvdata(&dev->dev, NULL);
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if (info->mtd) {
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#ifdef CONFIG_MTD_CONCAT
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if (info->cmtd != info->list[0].mtd) {
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del_mtd_device(info->cmtd);
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mtd_concat_destroy(info->cmtd);
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}
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#endif
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if (info->cmtd) {
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if (OF_FLASH_PARTS(info)) {
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del_mtd_partitions(info->mtd);
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del_mtd_partitions(info->cmtd);
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kfree(OF_FLASH_PARTS(info));
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} else {
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del_mtd_device(info->mtd);
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del_mtd_device(info->cmtd);
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}
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map_destroy(info->mtd);
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}
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if (info->map.virt)
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iounmap(info->map.virt);
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for (i = 0; i < info->list_size; i++) {
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if (info->list[i].mtd)
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map_destroy(info->list[i].mtd);
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if (info->res) {
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release_resource(info->res);
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kfree(info->res);
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if (info->list[i].map.virt)
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iounmap(info->list[i].map.virt);
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if (info->list[i].res) {
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release_resource(info->list[i].res);
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kfree(info->list[i].res);
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}
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}
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kfree(info);
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return 0;
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}
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@ -164,67 +185,129 @@ static int __devinit of_flash_probe(struct of_device *dev,
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const char *probe_type = match->data;
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const u32 *width;
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int err;
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int i;
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int count;
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const u32 *p;
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int reg_tuple_size;
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struct mtd_info **mtd_list = NULL;
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err = -ENXIO;
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if (of_address_to_resource(dp, 0, &res)) {
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dev_err(&dev->dev, "Can't get IO address from device tree\n");
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reg_tuple_size = (of_n_addr_cells(dp) + of_n_size_cells(dp)) * sizeof(u32);
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/*
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* Get number of "reg" tuples. Scan for MTD devices on area's
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* described by each "reg" region. This makes it possible (including
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* the concat support) to support the Intel P30 48F4400 chips which
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* consists internally of 2 non-identical NOR chips on one die.
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*/
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p = of_get_property(dp, "reg", &count);
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if (count % reg_tuple_size != 0) {
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dev_err(&dev->dev, "Malformed reg property on %s\n",
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dev->node->full_name);
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err = -EINVAL;
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goto err_out;
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}
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dev_dbg(&dev->dev, "of_flash device: %.8llx-%.8llx\n",
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(unsigned long long)res.start, (unsigned long long)res.end);
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count /= reg_tuple_size;
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err = -ENOMEM;
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info = kzalloc(sizeof(*info), GFP_KERNEL);
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info = kzalloc(sizeof(struct of_flash) +
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sizeof(struct of_flash_list) * count, GFP_KERNEL);
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if (!info)
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goto err_out;
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mtd_list = kzalloc(sizeof(struct mtd_info) * count, GFP_KERNEL);
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if (!info)
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goto err_out;
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dev_set_drvdata(&dev->dev, info);
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for (i = 0; i < count; i++) {
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err = -ENXIO;
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if (of_address_to_resource(dp, i, &res)) {
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dev_err(&dev->dev, "Can't get IO address from device"
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" tree\n");
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goto err_out;
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}
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dev_dbg(&dev->dev, "of_flash device: %.8llx-%.8llx\n",
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(unsigned long long)res.start,
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(unsigned long long)res.end);
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err = -EBUSY;
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info->res = request_mem_region(res.start, res.end - res.start + 1,
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info->list[i].res = request_mem_region(res.start, res.end -
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res.start + 1,
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dev_name(&dev->dev));
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if (!info->res)
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if (!info->list[i].res)
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goto err_out;
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err = -ENXIO;
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width = of_get_property(dp, "bank-width", NULL);
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if (!width) {
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dev_err(&dev->dev, "Can't get bank width from device tree\n");
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dev_err(&dev->dev, "Can't get bank width from device"
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" tree\n");
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goto err_out;
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}
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info->map.name = dev_name(&dev->dev);
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info->map.phys = res.start;
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info->map.size = res.end - res.start + 1;
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info->map.bankwidth = *width;
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info->list[i].map.name = dev_name(&dev->dev);
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info->list[i].map.phys = res.start;
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info->list[i].map.size = res.end - res.start + 1;
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info->list[i].map.bankwidth = *width;
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err = -ENOMEM;
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info->map.virt = ioremap(info->map.phys, info->map.size);
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if (!info->map.virt) {
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dev_err(&dev->dev, "Failed to ioremap() flash region\n");
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info->list[i].map.virt = ioremap(info->list[i].map.phys,
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info->list[i].map.size);
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if (!info->list[i].map.virt) {
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dev_err(&dev->dev, "Failed to ioremap() flash"
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" region\n");
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goto err_out;
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}
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simple_map_init(&info->map);
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simple_map_init(&info->list[i].map);
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if (probe_type)
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info->mtd = do_map_probe(probe_type, &info->map);
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else
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info->mtd = obsolete_probe(dev, &info->map);
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if (probe_type) {
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info->list[i].mtd = do_map_probe(probe_type,
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&info->list[i].map);
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} else {
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info->list[i].mtd = obsolete_probe(dev,
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&info->list[i].map);
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}
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mtd_list[i] = info->list[i].mtd;
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err = -ENXIO;
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if (!info->mtd) {
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if (!info->list[i].mtd) {
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dev_err(&dev->dev, "do_map_probe() failed\n");
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goto err_out;
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} else {
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info->list_size++;
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}
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info->mtd->owner = THIS_MODULE;
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info->mtd->dev.parent = &dev->dev;
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info->list[i].mtd->owner = THIS_MODULE;
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info->list[i].mtd->dev.parent = &dev->dev;
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}
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err = 0;
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if (info->list_size == 1) {
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info->cmtd = info->list[0].mtd;
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} else if (info->list_size > 1) {
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/*
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* We detected multiple devices. Concatenate them together.
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*/
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#ifdef CONFIG_MTD_CONCAT
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info->cmtd = mtd_concat_create(mtd_list, info->list_size,
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dev_name(&dev->dev));
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if (info->cmtd == NULL)
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err = -ENXIO;
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#else
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printk(KERN_ERR "physmap_of: multiple devices "
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"found but MTD concat support disabled.\n");
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err = -ENXIO;
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#endif
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}
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if (err)
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goto err_out;
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#ifdef CONFIG_MTD_PARTITIONS
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/* First look for RedBoot table or partitions on the command
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* line, these take precedence over device tree information */
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err = parse_mtd_partitions(info->mtd, part_probe_types,
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err = parse_mtd_partitions(info->cmtd, part_probe_types,
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&info->parts, 0);
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if (err < 0)
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return err;
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@ -244,15 +327,19 @@ static int __devinit of_flash_probe(struct of_device *dev,
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}
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if (err > 0)
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add_mtd_partitions(info->mtd, info->parts, err);
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add_mtd_partitions(info->cmtd, info->parts, err);
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else
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#endif
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add_mtd_device(info->mtd);
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add_mtd_device(info->cmtd);
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kfree(mtd_list);
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return 0;
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err_out:
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kfree(mtd_list);
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of_flash_remove(dev);
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return err;
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}
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