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Release 4.7 drivers/mtd/maps/sa1100-flash.c

Directory: drivers/mtd/maps
/*
 * 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);
}


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russell kingrussell king3740.22%266.67%


Total92100.00%3100.00%






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);
}


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david woodhousedavid woodhouse610.71%133.33%


Total56100.00%3100.00%






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;
	}

	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;
}


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david woodhousedavid woodhouse5720.28%220.00%


linus torvaldslinus torvalds10.36%110.00%


Total281100.00%10100.00%






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();
}


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jamie ilesjamie iles11.00%120.00%


Total100100.00%5100.00%






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;
	}
	info->mtd->dev.parent = &pdev->dev;

	if (ret == 0)
		return info;

 err:
	sa1100_destroy(info, plat);
 out:
	return ERR_PTR(ret);
}


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russell kingrussell king32977.41%969.23%


david woodhousedavid woodhouse8219.29%215.38%


frans klaverfrans klaver133.06%17.69%


burman yanburman yan10.24%17.69%


Total425100.00%13100.00%




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;
}


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russell kingrussell king7470.48%753.85%


david woodhousedavid woodhouse1413.33%215.38%


linus torvaldslinus torvalds98.57%17.69%


jingoo hanjingoo han43.81%17.69%


dmitry eremin-baryshkovdmitry eremin-baryshkov32.86%17.69%


artem bityutskiyartem bityutskiy10.95%17.69%


Total105100.00%13100.00%






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;
}


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russell kingrussell king3681.82%675.00%


jingoo hanjingoo han49.09%112.50%


david woodhousedavid woodhouse49.09%112.50%


Total44100.00%8100.00%




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");

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russell kingrussell king93773.32%1954.29%


david woodhousedavid woodhouse19215.02%25.71%


paul parsonspaul parsons655.09%12.86%


linus torvaldslinus torvalds473.68%25.71%


frans klaverfrans klaver131.02%12.86%


jingoo hanjingoo han80.63%12.86%


kay sieverskay sievers40.31%12.86%


dmitry eremin-baryshkovdmitry eremin-baryshkov30.23%12.86%


axel linaxel lin20.16%12.86%


uwe kleine-koeniguwe kleine-koenig20.16%12.86%


artem bityutskiyartem bityutskiy20.16%25.71%


jamie ilesjamie iles10.08%12.86%


burman yanburman yan10.08%12.86%


nicolas pitrenicolas pitre10.08%12.86%


bill pembertonbill pemberton0.00%00.00%


Total1278100.00%35100.00%

  
Directory: drivers/mtd/maps



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