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![Uwe Kleine-König](/assets/img/avatar_default.png)
orion_nand_probe lives in .init.text, so using platform_driver_register to register it is wrong because binding a device after the init memory is discarded (e.g. via sysfs) results in an oops. As requested by Nicolas Pitre platform_driver_probe is used instead of moving the probe function to .devinit.text as proposed initially. This saves some memory, but devices registered after the driver is probed are not bound (probably there are none) and binding via sysfs isn't possible. Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de> Cc: Lennert Buytenhek <buytenh@marvell.com> Cc: Saeed Bishara <saeed@marvell.com> Cc: Joern Engel <joern@logfs.org> Acked-by: Nicolas Pitre <nico@marvell.com> Cc: Greg Kroah-Hartman <gregkh@suse.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
197 lines
4.1 KiB
C
197 lines
4.1 KiB
C
/*
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* drivers/mtd/nand/orion_nand.c
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*
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* NAND support for Marvell Orion SoC platforms
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*
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* Tzachi Perelstein <tzachi@marvell.com>
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*
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* This file is licensed under the terms of the GNU General Public
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* License version 2. This program is licensed "as is" without any
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* warranty of any kind, whether express or implied.
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*/
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#include <linux/slab.h>
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#include <linux/module.h>
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#include <linux/platform_device.h>
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#include <linux/mtd/mtd.h>
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#include <linux/mtd/nand.h>
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#include <linux/mtd/partitions.h>
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#include <asm/io.h>
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#include <asm/sizes.h>
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#include <mach/hardware.h>
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#include <plat/orion_nand.h>
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#ifdef CONFIG_MTD_CMDLINE_PARTS
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static const char *part_probes[] = { "cmdlinepart", NULL };
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#endif
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static void orion_nand_cmd_ctrl(struct mtd_info *mtd, int cmd, unsigned int ctrl)
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{
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struct nand_chip *nc = mtd->priv;
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struct orion_nand_data *board = nc->priv;
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u32 offs;
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if (cmd == NAND_CMD_NONE)
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return;
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if (ctrl & NAND_CLE)
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offs = (1 << board->cle);
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else if (ctrl & NAND_ALE)
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offs = (1 << board->ale);
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else
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return;
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if (nc->options & NAND_BUSWIDTH_16)
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offs <<= 1;
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writeb(cmd, nc->IO_ADDR_W + offs);
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}
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static void orion_nand_read_buf(struct mtd_info *mtd, uint8_t *buf, int len)
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{
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struct nand_chip *chip = mtd->priv;
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void __iomem *io_base = chip->IO_ADDR_R;
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uint64_t *buf64;
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int i = 0;
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while (len && (unsigned long)buf & 7) {
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*buf++ = readb(io_base);
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len--;
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}
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buf64 = (uint64_t *)buf;
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while (i < len/8) {
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uint64_t x;
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asm volatile ("ldrd\t%0, [%1]" : "=&r" (x) : "r" (io_base));
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buf64[i++] = x;
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}
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i *= 8;
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while (i < len)
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buf[i++] = readb(io_base);
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}
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static int __init orion_nand_probe(struct platform_device *pdev)
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{
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struct mtd_info *mtd;
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struct nand_chip *nc;
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struct orion_nand_data *board;
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void __iomem *io_base;
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int ret = 0;
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#ifdef CONFIG_MTD_PARTITIONS
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struct mtd_partition *partitions = NULL;
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int num_part = 0;
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#endif
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nc = kzalloc(sizeof(struct nand_chip) + sizeof(struct mtd_info), GFP_KERNEL);
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if (!nc) {
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printk(KERN_ERR "orion_nand: failed to allocate device structure.\n");
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ret = -ENOMEM;
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goto no_res;
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}
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mtd = (struct mtd_info *)(nc + 1);
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io_base = ioremap(pdev->resource[0].start,
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pdev->resource[0].end - pdev->resource[0].start + 1);
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if (!io_base) {
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printk(KERN_ERR "orion_nand: ioremap failed\n");
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ret = -EIO;
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goto no_res;
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}
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board = pdev->dev.platform_data;
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mtd->priv = nc;
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mtd->owner = THIS_MODULE;
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nc->priv = board;
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nc->IO_ADDR_R = nc->IO_ADDR_W = io_base;
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nc->cmd_ctrl = orion_nand_cmd_ctrl;
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nc->read_buf = orion_nand_read_buf;
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nc->ecc.mode = NAND_ECC_SOFT;
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if (board->chip_delay)
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nc->chip_delay = board->chip_delay;
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if (board->width == 16)
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nc->options |= NAND_BUSWIDTH_16;
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platform_set_drvdata(pdev, mtd);
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if (nand_scan(mtd, 1)) {
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ret = -ENXIO;
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goto no_dev;
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}
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#ifdef CONFIG_MTD_PARTITIONS
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#ifdef CONFIG_MTD_CMDLINE_PARTS
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mtd->name = "orion_nand";
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num_part = parse_mtd_partitions(mtd, part_probes, &partitions, 0);
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#endif
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/* If cmdline partitions have been passed, let them be used */
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if (num_part <= 0) {
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num_part = board->nr_parts;
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partitions = board->parts;
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}
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if (partitions && num_part > 0)
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ret = add_mtd_partitions(mtd, partitions, num_part);
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else
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ret = add_mtd_device(mtd);
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#else
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ret = add_mtd_device(mtd);
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#endif
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if (ret) {
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nand_release(mtd);
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goto no_dev;
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}
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return 0;
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no_dev:
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platform_set_drvdata(pdev, NULL);
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iounmap(io_base);
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no_res:
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kfree(nc);
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return ret;
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}
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static int __devexit orion_nand_remove(struct platform_device *pdev)
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{
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struct mtd_info *mtd = platform_get_drvdata(pdev);
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struct nand_chip *nc = mtd->priv;
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nand_release(mtd);
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iounmap(nc->IO_ADDR_W);
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kfree(nc);
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return 0;
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}
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static struct platform_driver orion_nand_driver = {
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.remove = __devexit_p(orion_nand_remove),
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.driver = {
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.name = "orion_nand",
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.owner = THIS_MODULE,
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},
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};
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static int __init orion_nand_init(void)
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{
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return platform_driver_probe(&orion_nand_driver, orion_nand_probe);
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}
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static void __exit orion_nand_exit(void)
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{
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platform_driver_unregister(&orion_nand_driver);
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}
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module_init(orion_nand_init);
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module_exit(orion_nand_exit);
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Tzachi Perelstein");
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MODULE_DESCRIPTION("NAND glue for Orion platforms");
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MODULE_ALIAS("platform:orion_nand");
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