// SPDX-License-Identifier: GPL-2.0-only /* * Flash memory access on SA11x0 based devices * * (C) 2000 Nicolas Pitre */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include 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[]; }; 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); fallthrough; 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; } 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, 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; } /* * Allocate the map_info structs in one go. */ info = kzalloc(struct_size(info, subdev, nr), 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; cdev = kmalloc_array(nr, sizeof(*cdev), GFP_KERNEL); if (!cdev) { ret = -ENOMEM; goto err; } /* * 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); kfree(cdev); if (info->mtd == NULL) { ret = -ENXIO; goto err; } } info->mtd->dev.parent = &pdev->dev; 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 void 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); } 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");