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311 lines
6.5 KiB
311 lines
6.5 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* Flash memory access on SA11x0 based devices |
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* |
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* (C) 2000 Nicolas Pitre <[email protected]> |
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*/ |
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#include <linux/module.h> |
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#include <linux/types.h> |
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#include <linux/ioport.h> |
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#include <linux/kernel.h> |
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#include <linux/init.h> |
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#include <linux/errno.h> |
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#include <linux/slab.h> |
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#include <linux/platform_device.h> |
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#include <linux/err.h> |
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#include <linux/io.h> |
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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 <mach/hardware.h> |
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#include <linux/sizes.h> |
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#include <asm/mach/flash.h> |
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struct sa_subdev_info { |
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char name[16]; |
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struct map_info map; |
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struct mtd_info *mtd; |
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struct flash_platform_data *plat; |
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}; |
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struct sa_info { |
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struct mtd_info *mtd; |
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int num_subdev; |
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struct sa_subdev_info subdev[]; |
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}; |
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static DEFINE_SPINLOCK(sa1100_vpp_lock); |
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static int sa1100_vpp_refcnt; |
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static void sa1100_set_vpp(struct map_info *map, int on) |
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{ |
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struct sa_subdev_info *subdev = container_of(map, struct sa_subdev_info, map); |
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unsigned long flags; |
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spin_lock_irqsave(&sa1100_vpp_lock, flags); |
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if (on) { |
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if (++sa1100_vpp_refcnt == 1) /* first nested 'on' */ |
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subdev->plat->set_vpp(1); |
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} else { |
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if (--sa1100_vpp_refcnt == 0) /* last nested 'off' */ |
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subdev->plat->set_vpp(0); |
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} |
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spin_unlock_irqrestore(&sa1100_vpp_lock, flags); |
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} |
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static void sa1100_destroy_subdev(struct sa_subdev_info *subdev) |
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{ |
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if (subdev->mtd) |
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map_destroy(subdev->mtd); |
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if (subdev->map.virt) |
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iounmap(subdev->map.virt); |
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release_mem_region(subdev->map.phys, subdev->map.size); |
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} |
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static int sa1100_probe_subdev(struct sa_subdev_info *subdev, struct resource *res) |
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{ |
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unsigned long phys; |
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unsigned int size; |
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int ret; |
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phys = res->start; |
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size = res->end - phys + 1; |
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/* |
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* Retrieve the bankwidth from the MSC registers. |
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* We currently only implement CS0 and CS1 here. |
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*/ |
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switch (phys) { |
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default: |
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printk(KERN_WARNING "SA1100 flash: unknown base address " |
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"0x%08lx, assuming CS0\n", phys); |
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fallthrough; |
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case SA1100_CS0_PHYS: |
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subdev->map.bankwidth = (MSC0 & MSC_RBW) ? 2 : 4; |
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break; |
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case SA1100_CS1_PHYS: |
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subdev->map.bankwidth = ((MSC0 >> 16) & MSC_RBW) ? 2 : 4; |
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break; |
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} |
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if (!request_mem_region(phys, size, subdev->name)) { |
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ret = -EBUSY; |
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goto out; |
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} |
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if (subdev->plat->set_vpp) |
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subdev->map.set_vpp = sa1100_set_vpp; |
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subdev->map.phys = phys; |
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subdev->map.size = size; |
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subdev->map.virt = ioremap(phys, size); |
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if (!subdev->map.virt) { |
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ret = -ENOMEM; |
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goto err; |
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} |
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simple_map_init(&subdev->map); |
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/* |
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* Now let's probe for the actual flash. Do it here since |
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* specific machine settings might have been set above. |
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*/ |
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subdev->mtd = do_map_probe(subdev->plat->map_name, &subdev->map); |
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if (subdev->mtd == NULL) { |
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ret = -ENXIO; |
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goto err; |
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} |
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printk(KERN_INFO "SA1100 flash: CFI device at 0x%08lx, %uMiB, %d-bit\n", |
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phys, (unsigned)(subdev->mtd->size >> 20), |
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subdev->map.bankwidth * 8); |
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return 0; |
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err: |
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sa1100_destroy_subdev(subdev); |
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out: |
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return ret; |
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} |
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static void sa1100_destroy(struct sa_info *info, struct flash_platform_data *plat) |
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{ |
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int i; |
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if (info->mtd) { |
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mtd_device_unregister(info->mtd); |
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if (info->mtd != info->subdev[0].mtd) |
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mtd_concat_destroy(info->mtd); |
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} |
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for (i = info->num_subdev - 1; i >= 0; i--) |
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sa1100_destroy_subdev(&info->subdev[i]); |
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kfree(info); |
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if (plat->exit) |
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plat->exit(); |
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} |
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static struct sa_info *sa1100_setup_mtd(struct platform_device *pdev, |
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struct flash_platform_data *plat) |
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{ |
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struct sa_info *info; |
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int nr, size, i, ret = 0; |
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/* |
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* Count number of devices. |
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*/ |
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for (nr = 0; ; nr++) |
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if (!platform_get_resource(pdev, IORESOURCE_MEM, nr)) |
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break; |
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if (nr == 0) { |
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ret = -ENODEV; |
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goto out; |
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} |
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size = sizeof(struct sa_info) + sizeof(struct sa_subdev_info) * nr; |
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/* |
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* Allocate the map_info structs in one go. |
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*/ |
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info = kzalloc(size, GFP_KERNEL); |
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if (!info) { |
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ret = -ENOMEM; |
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goto out; |
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} |
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if (plat->init) { |
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ret = plat->init(); |
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if (ret) |
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goto err; |
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} |
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/* |
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* Claim and then map the memory regions. |
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*/ |
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for (i = 0; i < nr; i++) { |
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struct sa_subdev_info *subdev = &info->subdev[i]; |
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struct resource *res; |
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res = platform_get_resource(pdev, IORESOURCE_MEM, i); |
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if (!res) |
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break; |
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subdev->map.name = subdev->name; |
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sprintf(subdev->name, "%s-%d", plat->name, i); |
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subdev->plat = plat; |
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ret = sa1100_probe_subdev(subdev, res); |
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if (ret) |
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break; |
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} |
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info->num_subdev = i; |
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/* |
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* ENXIO is special. It means we didn't find a chip when we probed. |
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*/ |
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if (ret != 0 && !(ret == -ENXIO && info->num_subdev > 0)) |
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goto err; |
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/* |
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* If we found one device, don't bother with concat support. If |
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* we found multiple devices, use concat if we have it available, |
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* otherwise fail. Either way, it'll be called "sa1100". |
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*/ |
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if (info->num_subdev == 1) { |
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strcpy(info->subdev[0].name, plat->name); |
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info->mtd = info->subdev[0].mtd; |
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ret = 0; |
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} else if (info->num_subdev > 1) { |
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struct mtd_info **cdev; |
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cdev = kmalloc_array(nr, sizeof(*cdev), GFP_KERNEL); |
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if (!cdev) { |
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ret = -ENOMEM; |
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goto err; |
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} |
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/* |
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* We detected multiple devices. Concatenate them together. |
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*/ |
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for (i = 0; i < info->num_subdev; i++) |
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cdev[i] = info->subdev[i].mtd; |
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info->mtd = mtd_concat_create(cdev, info->num_subdev, |
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plat->name); |
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kfree(cdev); |
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if (info->mtd == NULL) { |
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ret = -ENXIO; |
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goto err; |
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} |
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} |
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info->mtd->dev.parent = &pdev->dev; |
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if (ret == 0) |
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return info; |
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err: |
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sa1100_destroy(info, plat); |
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out: |
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return ERR_PTR(ret); |
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} |
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static const char * const part_probes[] = { "cmdlinepart", "RedBoot", NULL }; |
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static int sa1100_mtd_probe(struct platform_device *pdev) |
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{ |
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struct flash_platform_data *plat = dev_get_platdata(&pdev->dev); |
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struct sa_info *info; |
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int err; |
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if (!plat) |
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return -ENODEV; |
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info = sa1100_setup_mtd(pdev, plat); |
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if (IS_ERR(info)) { |
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err = PTR_ERR(info); |
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goto out; |
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} |
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/* |
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* Partition selection stuff. |
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*/ |
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mtd_device_parse_register(info->mtd, part_probes, NULL, plat->parts, |
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plat->nr_parts); |
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platform_set_drvdata(pdev, info); |
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err = 0; |
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out: |
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return err; |
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} |
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static int sa1100_mtd_remove(struct platform_device *pdev) |
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{ |
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struct sa_info *info = platform_get_drvdata(pdev); |
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struct flash_platform_data *plat = dev_get_platdata(&pdev->dev); |
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sa1100_destroy(info, plat); |
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return 0; |
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} |
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static struct platform_driver sa1100_mtd_driver = { |
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.probe = sa1100_mtd_probe, |
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.remove = sa1100_mtd_remove, |
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.driver = { |
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.name = "sa1100-mtd", |
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}, |
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}; |
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module_platform_driver(sa1100_mtd_driver); |
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MODULE_AUTHOR("Nicolas Pitre"); |
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MODULE_DESCRIPTION("SA1100 CFI map driver"); |
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MODULE_LICENSE("GPL"); |
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MODULE_ALIAS("platform:sa1100-mtd");
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