lantiq: Concatenate multiple flash chips for lantiq-flash
Signed-off-by: Maikel Bloemendal <openwrt@maikelenyvonne.nl> Tested-by: Eddi De Pieri <eddi@depieri.net> SVN-Revision: 43272
This commit is contained in:
John Crispin
parent
6fafcba63b
commit
44d703160b
1 changed files with 215 additions and 0 deletions
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@ -0,0 +1,215 @@
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--- "a/drivers/mtd/maps/lantiq-flash.c"
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+++ "b/drivers/mtd/maps/lantiq-flash.c"
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@@ -20,6 +20,7 @@
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#include <linux/mtd/cfi.h>
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#include <linux/platform_device.h>
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#include <linux/mtd/physmap.h>
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+#include <linux/mtd/concat.h>
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#include <linux/of.h>
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#include <lantiq_soc.h>
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@@ -39,10 +40,12 @@
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LTQ_NOR_NORMAL
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};
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+#define MAX_RESOURCES 4
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+
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struct ltq_mtd {
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- struct resource *res;
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- struct mtd_info *mtd;
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- struct map_info *map;
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+ struct mtd_info *mtd[MAX_RESOURCES];
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+ struct mtd_info *cmtd;
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+ struct map_info map[MAX_RESOURCES];
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};
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static const char ltq_map_name[] = "ltq_nor";
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@@ -110,12 +113,39 @@
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}
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static int
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+ltq_mtd_remove(struct platform_device *pdev)
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+{
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+ struct ltq_mtd *ltq_mtd = platform_get_drvdata(pdev);
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+ int i;
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+
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+ if (ltq_mtd == NULL)
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+ return 0;
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+
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+ if (ltq_mtd->cmtd) {
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+ mtd_device_unregister(ltq_mtd->cmtd);
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+ if (ltq_mtd->cmtd != ltq_mtd->mtd[0])
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+ mtd_concat_destroy(ltq_mtd->cmtd);
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+ }
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+
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+ for (i = 0; i < MAX_RESOURCES; i++) {
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+ if (ltq_mtd->mtd[i] != NULL)
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+ map_destroy(ltq_mtd->mtd[i]);
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+ }
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+
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+ kfree(ltq_mtd);
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+
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+ return 0;
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+}
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+
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+static int
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ltq_mtd_probe(struct platform_device *pdev)
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{
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struct mtd_part_parser_data ppdata;
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struct ltq_mtd *ltq_mtd;
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struct cfi_private *cfi;
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- int err;
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+ int err = 0;
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+ int i;
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+ int devices_found = 0;
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static const char *rom_probe_types[] = {
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"cfi_probe", "jedec_probe", NULL
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@@ -134,79 +164,88 @@
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platform_set_drvdata(pdev, ltq_mtd);
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- ltq_mtd->res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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- if (!ltq_mtd->res) {
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- dev_err(&pdev->dev, "failed to get memory resource\n");
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- return -ENOENT;
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+ for (i = 0; i < pdev->num_resources; i++) {
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+ printk(KERN_NOTICE "lantiq nor flash device: %.8llx at %.8llx\n",
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+ (unsigned long long)resource_size(&pdev->resource[i]),
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+ (unsigned long long)pdev->resource[i].start);
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+
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+ if (!devm_request_mem_region(&pdev->dev,
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+ pdev->resource[i].start,
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+ resource_size(&pdev->resource[i]),
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+ dev_name(&pdev->dev))) {
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+ dev_err(&pdev->dev, "Could not reserve memory region\n");
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+ return -ENOMEM;
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+ }
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+
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+ ltq_mtd->map[i].name = ltq_map_name;
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+ ltq_mtd->map[i].bankwidth = 2;
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+ ltq_mtd->map[i].read = ltq_read16;
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+ ltq_mtd->map[i].write = ltq_write16;
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+ ltq_mtd->map[i].copy_from = ltq_copy_from;
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+ ltq_mtd->map[i].copy_to = ltq_copy_to;
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+
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+ if (of_find_property(pdev->dev.of_node, "lantiq,noxip", NULL))
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+ ltq_mtd->map[i].phys = NO_XIP;
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+ else
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+ ltq_mtd->map[i].phys = pdev->resource[i].start;
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+ ltq_mtd->map[i].size = resource_size(&pdev->resource[i]);
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+ ltq_mtd->map[i].virt = devm_ioremap(&pdev->dev, ltq_mtd->map[i].phys,
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+ ltq_mtd->map[i].size);
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+ if (IS_ERR(ltq_mtd->map[i].virt))
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+ return PTR_ERR(ltq_mtd->map[i].virt);
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+
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+ if (ltq_mtd->map[i].virt == NULL) {
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+ dev_err(&pdev->dev, "Failed to ioremap flash region\n");
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+ err = PTR_ERR(ltq_mtd->map[i].virt);
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+ goto err_out;
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+ }
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+
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+ ltq_mtd->map[i].map_priv_1 = LTQ_NOR_PROBING;
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+ for (type = rom_probe_types; !ltq_mtd->mtd[i] && *type; type++)
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+ ltq_mtd->mtd[i] = do_map_probe(*type, <q_mtd->map[i]);
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+ ltq_mtd->map[i].map_priv_1 = LTQ_NOR_NORMAL;
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+
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+ if (!ltq_mtd->mtd[i]) {
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+ dev_err(&pdev->dev, "probing failed\n");
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+ return -ENXIO;
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+ } else {
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+ devices_found++;
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+ }
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+
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+ ltq_mtd->mtd[i]->owner = THIS_MODULE;
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+ ltq_mtd->mtd[i]->dev.parent = &pdev->dev;
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+
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+ cfi = ltq_mtd->map[i].fldrv_priv;
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+ cfi->addr_unlock1 ^= 1;
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+ cfi->addr_unlock2 ^= 1;
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}
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- ltq_mtd->map = devm_kzalloc(&pdev->dev, sizeof(struct map_info),
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- GFP_KERNEL);
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- if (!ltq_mtd->map)
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- return -ENOMEM;
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-
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- if (of_find_property(pdev->dev.of_node, "lantiq,noxip", NULL))
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- ltq_mtd->map->phys = NO_XIP;
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- else
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- ltq_mtd->map->phys = ltq_mtd->res->start;
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- ltq_mtd->res->start;
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- ltq_mtd->map->size = resource_size(ltq_mtd->res);
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- ltq_mtd->map->virt = devm_ioremap_resource(&pdev->dev, ltq_mtd->res);
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- if (IS_ERR(ltq_mtd->map->virt))
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- return PTR_ERR(ltq_mtd->map->virt);
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-
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- ltq_mtd->map->name = ltq_map_name;
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- ltq_mtd->map->bankwidth = 2;
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- ltq_mtd->map->read = ltq_read16;
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- ltq_mtd->map->write = ltq_write16;
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- ltq_mtd->map->copy_from = ltq_copy_from;
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- ltq_mtd->map->copy_to = ltq_copy_to;
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-
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- ltq_mtd->map->map_priv_1 = LTQ_NOR_PROBING;
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-
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- for (type = rom_probe_types; !ltq_mtd->mtd && *type; type++)
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- ltq_mtd->mtd = do_map_probe(*type, ltq_mtd->map);
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-
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- ltq_mtd->map->map_priv_1 = LTQ_NOR_NORMAL;
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-
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- if (!ltq_mtd->mtd) {
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- dev_err(&pdev->dev, "probing failed\n");
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- return -ENXIO;
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- }
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-
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- ltq_mtd->mtd->owner = THIS_MODULE;
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-
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- cfi = ltq_mtd->map->fldrv_priv;
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- cfi->addr_unlock1 ^= 1;
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- cfi->addr_unlock2 ^= 1;
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+ if (devices_found == 1) {
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+ ltq_mtd->cmtd = ltq_mtd->mtd[0];
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+ } else if (devices_found > 1) {
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+ /*
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+ * We detected multiple devices. Concatenate them together.
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+ */
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+ ltq_mtd->cmtd = mtd_concat_create(ltq_mtd->mtd, devices_found, dev_name(&pdev->dev));
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+ if (ltq_mtd->cmtd == NULL)
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+ err = -ENXIO;
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+ }
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ppdata.of_node = pdev->dev.of_node;
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- err = mtd_device_parse_register(ltq_mtd->mtd, ltq_probe_types,
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+ err = mtd_device_parse_register(ltq_mtd->cmtd, ltq_probe_types,
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&ppdata, NULL, 0);
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if (err) {
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dev_err(&pdev->dev, "failed to add partitions\n");
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- goto err_destroy;
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+ goto err_out;
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}
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return 0;
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-err_destroy:
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- map_destroy(ltq_mtd->mtd);
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+err_out:
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+ ltq_mtd_remove(pdev);
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return err;
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}
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-static int
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-ltq_mtd_remove(struct platform_device *pdev)
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-{
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- struct ltq_mtd *ltq_mtd = platform_get_drvdata(pdev);
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-
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- if (ltq_mtd && ltq_mtd->mtd) {
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- mtd_device_unregister(ltq_mtd->mtd);
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- map_destroy(ltq_mtd->mtd);
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- }
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- return 0;
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-}
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-
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static const struct of_device_id ltq_mtd_match[] = {
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{ .compatible = "lantiq,nor" },
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{},
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