303 lines
6.3 KiB
C
303 lines
6.3 KiB
C
/*
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* Flash memory access on SA11x0 based devices
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*
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* (C) 2000 Nicolas Pitre <nico@fluxnic.net>
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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 <asm/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[0];
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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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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[nr];
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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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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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