--- /dev/null
+/*
+ * Flash memory access on SA11x0 based devices
+ *
+ * (C) 2000 Nicolas Pitre <nico@fluxnic.net>
+ */
+#include <linux/module.h>
+#include <linux/types.h>
+#include <linux/ioport.h>
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/errno.h>
+#include <linux/slab.h>
+#include <linux/platform_device.h>
+#include <linux/err.h>
+#include <linux/io.h>
+
+#include <linux/mtd/mtd.h>
+#include <linux/mtd/map.h>
+#include <linux/mtd/partitions.h>
+#include <linux/mtd/concat.h>
+
+#include <mach/hardware.h>
+#include <asm/sizes.h>
+#include <asm/mach/flash.h>
+
+struct sa_subdev_info {
+ char name[16];
+ struct map_info map;
+ struct mtd_info *mtd;
+ struct flash_platform_data *plat;
+};
+
+struct sa_info {
+ struct mtd_info *mtd;
+ int num_subdev;
+ struct sa_subdev_info subdev[0];
+};
+
+static DEFINE_SPINLOCK(sa1100_vpp_lock);
+static int sa1100_vpp_refcnt;
+static void sa1100_set_vpp(struct map_info *map, int on)
+{
+ struct sa_subdev_info *subdev = container_of(map, struct sa_subdev_info, map);
+ unsigned long flags;
+
+ spin_lock_irqsave(&sa1100_vpp_lock, flags);
+ if (on) {
+ if (++sa1100_vpp_refcnt == 1) /* first nested 'on' */
+ subdev->plat->set_vpp(1);
+ } else {
+ if (--sa1100_vpp_refcnt == 0) /* last nested 'off' */
+ subdev->plat->set_vpp(0);
+ }
+ spin_unlock_irqrestore(&sa1100_vpp_lock, flags);
+}
+
+static void sa1100_destroy_subdev(struct sa_subdev_info *subdev)
+{
+ if (subdev->mtd)
+ map_destroy(subdev->mtd);
+ if (subdev->map.virt)
+ iounmap(subdev->map.virt);
+ release_mem_region(subdev->map.phys, subdev->map.size);
+}
+
+static int sa1100_probe_subdev(struct sa_subdev_info *subdev, struct resource *res)
+{
+ unsigned long phys;
+ unsigned int size;
+ int ret;
+
+ phys = res->start;
+ size = res->end - phys + 1;
+
+ /*
+ * Retrieve the bankwidth from the MSC registers.
+ * We currently only implement CS0 and CS1 here.
+ */
+ switch (phys) {
+ default:
+ printk(KERN_WARNING "SA1100 flash: unknown base address "
+ "0x%08lx, assuming CS0\n", phys);
+
+ case SA1100_CS0_PHYS:
+ subdev->map.bankwidth = (MSC0 & MSC_RBW) ? 2 : 4;
+ break;
+
+ case SA1100_CS1_PHYS:
+ subdev->map.bankwidth = ((MSC0 >> 16) & MSC_RBW) ? 2 : 4;
+ break;
+ }
+
+ if (!request_mem_region(phys, size, subdev->name)) {
+ ret = -EBUSY;
+ goto out;
+ }
+
+ if (subdev->plat->set_vpp)
+ subdev->map.set_vpp = sa1100_set_vpp;
+
+ subdev->map.phys = phys;
+ subdev->map.size = size;
+ subdev->map.virt = ioremap(phys, size);
+ if (!subdev->map.virt) {
+ ret = -ENOMEM;
+ goto err;
+ }
+
+ simple_map_init(&subdev->map);
+
+ /*
+ * Now let's probe for the actual flash. Do it here since
+ * specific machine settings might have been set above.
+ */
+ subdev->mtd = do_map_probe(subdev->plat->map_name, &subdev->map);
+ if (subdev->mtd == NULL) {
+ ret = -ENXIO;
+ goto err;
+ }
+ subdev->mtd->owner = THIS_MODULE;
+
+ printk(KERN_INFO "SA1100 flash: CFI device at 0x%08lx, %uMiB, %d-bit\n",
+ phys, (unsigned)(subdev->mtd->size >> 20),
+ subdev->map.bankwidth * 8);
+
+ return 0;
+
+ err:
+ sa1100_destroy_subdev(subdev);
+ out:
+ return ret;
+}
+
+static void sa1100_destroy(struct sa_info *info, struct flash_platform_data *plat)
+{
+ int i;
+
+ if (info->mtd) {
+ mtd_device_unregister(info->mtd);
+ if (info->mtd != info->subdev[0].mtd)
+ mtd_concat_destroy(info->mtd);
+ }
+
+ for (i = info->num_subdev - 1; i >= 0; i--)
+ sa1100_destroy_subdev(&info->subdev[i]);
+ kfree(info);
+
+ if (plat->exit)
+ plat->exit();
+}
+
+static struct sa_info *sa1100_setup_mtd(struct platform_device *pdev,
+ struct flash_platform_data *plat)
+{
+ struct sa_info *info;
+ int nr, size, i, ret = 0;
+
+ /*
+ * Count number of devices.
+ */
+ for (nr = 0; ; nr++)
+ if (!platform_get_resource(pdev, IORESOURCE_MEM, nr))
+ break;
+
+ if (nr == 0) {
+ ret = -ENODEV;
+ goto out;
+ }
+
+ size = sizeof(struct sa_info) + sizeof(struct sa_subdev_info) * nr;
+
+ /*
+ * Allocate the map_info structs in one go.
+ */
+ info = kzalloc(size, GFP_KERNEL);
+ if (!info) {
+ ret = -ENOMEM;
+ goto out;
+ }
+
+ if (plat->init) {
+ ret = plat->init();
+ if (ret)
+ goto err;
+ }
+
+ /*
+ * Claim and then map the memory regions.
+ */
+ for (i = 0; i < nr; i++) {
+ struct sa_subdev_info *subdev = &info->subdev[i];
+ struct resource *res;
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, i);
+ if (!res)
+ break;
+
+ subdev->map.name = subdev->name;
+ sprintf(subdev->name, "%s-%d", plat->name, i);
+ subdev->plat = plat;
+
+ ret = sa1100_probe_subdev(subdev, res);
+ if (ret)
+ break;
+ }
+
+ info->num_subdev = i;
+
+ /*
+ * ENXIO is special. It means we didn't find a chip when we probed.
+ */
+ if (ret != 0 && !(ret == -ENXIO && info->num_subdev > 0))
+ goto err;
+
+ /*
+ * If we found one device, don't bother with concat support. If
+ * we found multiple devices, use concat if we have it available,
+ * otherwise fail. Either way, it'll be called "sa1100".
+ */
+ if (info->num_subdev == 1) {
+ strcpy(info->subdev[0].name, plat->name);
+ info->mtd = info->subdev[0].mtd;
+ ret = 0;
+ } else if (info->num_subdev > 1) {
+ struct mtd_info *cdev[nr];
+ /*
+ * We detected multiple devices. Concatenate them together.
+ */
+ for (i = 0; i < info->num_subdev; i++)
+ cdev[i] = info->subdev[i].mtd;
+
+ info->mtd = mtd_concat_create(cdev, info->num_subdev,
+ plat->name);
+ if (info->mtd == NULL)
+ ret = -ENXIO;
+ }
+
+ if (ret == 0)
+ return info;
+
+ err:
+ sa1100_destroy(info, plat);
+ out:
+ return ERR_PTR(ret);
+}
+
+static const char * const part_probes[] = { "cmdlinepart", "RedBoot", NULL };
+
+static int sa1100_mtd_probe(struct platform_device *pdev)
+{
+ struct flash_platform_data *plat = dev_get_platdata(&pdev->dev);
+ struct sa_info *info;
+ int err;
+
+ if (!plat)
+ return -ENODEV;
+
+ info = sa1100_setup_mtd(pdev, plat);
+ if (IS_ERR(info)) {
+ err = PTR_ERR(info);
+ goto out;
+ }
+
+ /*
+ * Partition selection stuff.
+ */
+ mtd_device_parse_register(info->mtd, part_probes, NULL, plat->parts,
+ plat->nr_parts);
+
+ platform_set_drvdata(pdev, info);
+ err = 0;
+
+ out:
+ return err;
+}
+
+static int sa1100_mtd_remove(struct platform_device *pdev)
+{
+ struct sa_info *info = platform_get_drvdata(pdev);
+ struct flash_platform_data *plat = dev_get_platdata(&pdev->dev);
+
+ sa1100_destroy(info, plat);
+
+ return 0;
+}
+
+static struct platform_driver sa1100_mtd_driver = {
+ .probe = sa1100_mtd_probe,
+ .remove = sa1100_mtd_remove,
+ .driver = {
+ .name = "sa1100-mtd",
+ },
+};
+
+module_platform_driver(sa1100_mtd_driver);
+
+MODULE_AUTHOR("Nicolas Pitre");
+MODULE_DESCRIPTION("SA1100 CFI map driver");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:sa1100-mtd");
Code Review / kvmfornfv.git / blobdiff