Convert the nand driver to a platform_device, should only allow routerboards to use it
[openwrt/svn-archive/archive.git] / target / linux / adm5120-2.6 / files / drivers / mtd / nand / rbmipsnand.c
index 5b98833..9e6ae1b 100644 (file)
@@ -8,7 +8,9 @@
 /* Copyright(C) 2007 david.goodenough@linkchoose.co.uk (for rewriten code)      */
 /*==============================================================================*/
 
-#include <linux/init.h>
+#include <linux/io.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
 #include <linux/mtd/nand.h>
 #include <linux/mtd/mtd.h>
 #include <linux/mtd/partitions.h>
 #define NAND_STS_REG   0xB     //Status register
 
 #define MEM32(x) *((volatile unsigned *) (x))
-static void __iomem *p_nand;
-
-static int rb100_dev_ready(struct mtd_info *mtd) {
-    return SMEM1(NAND_STS_REG) & 0x80;
-}
-
-static void rbmips_hwcontrol100(struct mtd_info *mtd, int cmd, unsigned int ctrl) {
-    struct nand_chip *chip = mtd->priv;
-    if (ctrl & NAND_CTRL_CHANGE) {
-        SMEM1((( ctrl & NAND_CLE) ? NAND_SET_CLE : NAND_CLR_CLE)) = 0x01;
-        SMEM1((( ctrl & NAND_ALE) ? NAND_SET_ALE : NAND_CLR_ALE)) = 0x01;
-        SMEM1((( ctrl & NAND_NCE) ? NAND_SET_CEn : NAND_CLR_CEn)) = 0x01;
-        }
-    if( cmd != NAND_CMD_NONE)
-        writeb( cmd, chip->IO_ADDR_W);
-}
 
 static struct mtd_partition partition_info[] = {
     {
         name: "RouterBoard NAND Boot",
         offset: 0,
-       size: 4 * 1024 * 1024
+        size: 4 * 1024 * 1024
     },
     {
         name: "rootfs",
-       offset: MTDPART_OFS_NXTBLK,
-       size: MTDPART_SIZ_FULL
+        offset: MTDPART_OFS_NXTBLK,
+        size: MTDPART_SIZ_FULL
     }
 };
 
-static struct mtd_info rmtd;
-static struct nand_chip rnand;
-/*========================================================================*/
-/* We need to use the OLD Yaffs-1 OOB layout, otherwise the RB bootloader */
-/* will not be able to find the kernel that we load.  So set the oobinfo  */
-/* when creating the partitions.                                          */ 
-/*========================================================================*/
 static struct nand_ecclayout rb_ecclayout = {
         .eccbytes = 6,
         .eccpos = { 8, 9, 10, 13, 14, 15 },
-       .oobavail = 9,
+        .oobavail = 9,
         .oobfree = { { 0, 4 }, { 6, 2 }, { 11, 2 }, { 4, 1} }
 };
+
+struct adm5120_nand_info {
+       struct nand_chip chip;
+       struct mtd_info mtd;
+       void __iomem *io_base;
+#ifdef CONFIG_MTD_PARTITIONS
+       int     nr_parts;
+       struct mtd_partition *parts;
+#endif
+};
+
+static int rb100_dev_ready(struct mtd_info *mtd)
+{
+       return SMEM1(NAND_STS_REG) & 0x80;
+}
+
+static void rbmips_hwcontrol100(struct mtd_info *mtd, int cmd, unsigned int ctrl)
+{
+       struct nand_chip *chip = mtd->priv;
+       if (ctrl & NAND_CTRL_CHANGE)
+       {
+               SMEM1((( ctrl & NAND_CLE) ? NAND_SET_CLE : NAND_CLR_CLE)) = 0x01;
+               SMEM1((( ctrl & NAND_ALE) ? NAND_SET_ALE : NAND_CLR_ALE)) = 0x01;
+               SMEM1((( ctrl & NAND_NCE) ? NAND_SET_CEn : NAND_CLR_CEn)) = 0x01;
+        }
+       if (cmd != NAND_CMD_NONE)
+               writeb( cmd, chip->IO_ADDR_W);
+}
+
+/*========================================================================*/
+/* We need to use the OLD Yaffs-1 OOB layout, otherwise the RB bootloader */
+/* will not be able to find the kernel that we load.  So set the oobinfo  */
+/* when creating the partitions.                                          */ 
+/*========================================================================*/
+
 static unsigned init_ok = 0;
 
-unsigned get_rbnand_block_size(void) {
-       return init_ok ? rmtd.writesize : 0;
+unsigned get_rbnand_block_size(struct adm5120_nand_info *data)
+{
+       return init_ok ? data->mtd.writesize : 0;
 }
 
 EXPORT_SYMBOL(get_rbnand_block_size);
 
-int __init rbmips_init(void) {
+static int rbmips_probe(struct platform_device *pdev)
+{
+       struct adm5120_nand_info *data;
+       int res = 0;
+
+       /* Allocate memory for the nand_chip structure */
+       data = kzalloc(sizeof(*data), GFP_KERNEL);
+       if (!data) {
+               dev_err(&pdev->dev, "Failed to allocate device structure\n");
+               return -ENOMEM;
+
+       }
+       
+       data->io_base = ioremap(pdev->resource[0].start, 0x1000);
 
-       if (!adm5120_nand_boot)
-               return -ENODEV;
+       if (data->io_base == NULL) {
+               dev_err(&pdev->dev, "ioremap failed\n");
+               kfree(data);
+               return -EIO;
+       }
 
-       memset(&rmtd, 0, sizeof(rmtd));
-       memset(&rnand, 0, sizeof(rnand));
-       printk(KERN_INFO "RB1xx nand\n");
        MEM32(0xB2000064) = 0x100;
        MEM32(0xB2000008) = 0x1;
        SMEM1(NAND_SET_SPn) = 0x01;
        SMEM1(NAND_CLR_WPn) = 0x01;
-       rnand.IO_ADDR_R = (unsigned char *)KSEG1ADDR(ADM5120_SRAM1_BASE);
-       rnand.IO_ADDR_W = rnand.IO_ADDR_R;
-       rnand.cmd_ctrl = rbmips_hwcontrol100;
-       rnand.dev_ready = rb100_dev_ready;
-       p_nand = (void __iomem *)ioremap(( unsigned long)ADM5120_SRAM1_BASE, 0x1000);
-       if (!p_nand) {
-               printk(KERN_WARNING "RB1xx nand Unable ioremap buffer\n");
-               return -ENXIO;
-       }
-       rnand.ecc.mode = NAND_ECC_SOFT;
-       rnand.ecc.layout = &rb_ecclayout;
-       rnand.chip_delay = 25;
-       rnand.options |= NAND_NO_AUTOINCR;
-       rmtd.priv = &rnand;
-       if (nand_scan(&rmtd, 1) && nand_scan(&rmtd, 1)
-           && nand_scan(&rmtd, 1)  && nand_scan(&rmtd, 1)) {
+
+       data->chip.priv = &data;
+       data->mtd.priv = &data->chip;
+       data->mtd.owner = THIS_MODULE;
+
+       data->chip.IO_ADDR_R = (unsigned char *)KSEG1ADDR(ADM5120_SRAM1_BASE);
+       data->chip.IO_ADDR_W = data->chip.IO_ADDR_R;
+       data->chip.cmd_ctrl = rbmips_hwcontrol100;
+       data->chip.dev_ready = rb100_dev_ready;
+       data->chip.ecc.mode = NAND_ECC_SOFT;
+       data->chip.ecc.layout = &rb_ecclayout;
+       data->chip.chip_delay = 25;
+       data->chip.options |= NAND_NO_AUTOINCR;
+
+       platform_set_drvdata(pdev, data);
+
+       /* Why do we need to scan 4 times ? */
+       if (nand_scan(&data->mtd, 1) && nand_scan(&data->mtd, 1) && nand_scan(&data->mtd, 1)  && nand_scan(&data->mtd, 1)) {
                printk(KERN_INFO "RB1xxx nand device not found\n");
-               iounmap ((void *)p_nand);
-               return -ENXIO;
+               res = -ENXIO;
+               goto out;
        }
-       add_mtd_partitions(&rmtd, partition_info, 2);
+
+       add_mtd_partitions(&data->mtd, partition_info, 2);
        init_ok = 1;
+
+       res = add_mtd_device(&data->mtd);
+       if (!res)
+               return res;
+
+       nand_release(&data->mtd);
+out:
+       platform_set_drvdata(pdev, NULL);
+       iounmap(data->io_base);
+       kfree(data);
+       return res;
+}
+
+static int __devexit rbmips_remove(struct platform_device *pdev)
+{
+       struct adm5120_nand_info *data = platform_get_drvdata(pdev);
+       
+       nand_release(&data->mtd);
+       iounmap(data->io_base);
+       kfree(data);
+       
        return 0;
 }
 
-module_init(rbmips_init);
+static struct platform_driver adm5120_nand_driver = {
+       .probe          = rbmips_probe,
+       .remove         = rbmips_remove,
+       .driver         = {
+               .name   = "adm5120-nand",
+               .owner  = THIS_MODULE,
+       },
+};
+
+static int __init adm5120_nand_init(void)
+{
+       int err;
+       err = platform_driver_register(&adm5120_nand_driver);
+       return err;
+}
+
+static void __exit adm5120_nand_exit(void)
+{
+       platform_driver_unregister(&adm5120_nand_driver);
+}
+
+module_init(adm5120_nand_init);
+module_exit(adm5120_nand_exit);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("David Goodenough, Florian Fainelli");
+MODULE_DESCRIPTION("RouterBOARD 100 NAND driver");