Convert the nand driver to a platform_device, should only allow routerboards to use it

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@8045 3c298f89-4303-0410-b956-a3cf2f4a3e73

target/linux/adm5120-2.6/files/arch/mips/adm5120/boards/mikrotik.c

@@ -47,6 +47,7 @@ static struct mtd_partition rb1xx_partitions[] = {
 
 static struct platform_device *rb1xx_devices[] __initdata = {
 	&adm5120_flash0_device,
+	&adm5120_nand_device,
 };
 
 static void __init rb1xx_setup(void)

target/linux/adm5120-2.6/files/arch/mips/adm5120/platform.c

@@ -109,3 +109,22 @@ struct platform_device adm5120_flash1_device =	{
 	.id	= 1,
 	.dev.platform_data = &adm5120_flash1_data,
 };
+
+/* NAND flash */
+struct resource adm5120_nand_resource[] = {
+	[0] = {
+		.start	= ADM5120_SRAM1_BASE,
+		.end	= ADM5120_SRAM1_BASE+0x1000-1,
+		.flags	= IORESOURCE_MEM,
+	},
+};
+
+struct adm5120_nand_platform_data adm5120_nand_data;
+
+struct platform_device adm5120_nand_device = {
+	.name 		= "adm5120-nand",
+	.id		= -1,
+	.dev.platform_data = &adm5120_nand_data,
+	.num_resources	= ARRAY_SIZE(adm5120_nand_resource),
+	.resource	= adm5120_nand_resource,
+};

target/linux/adm5120-2.6/files/drivers/mtd/nand/rbmipsnand.c

@@ -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>
@@ -36,22 +38,6 @@
 #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[] = {
     {
@@ -66,63 +52,155 @@ static struct mtd_partition partition_info[] = {
     }
 };
 
-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,
         .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) {
+unsigned get_rbnand_block_size(struct adm5120_nand_info *data)
-	return init_ok ? rmtd.writesize : 0;
+{
+	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;
 
-	if (!adm5120_nand_boot)
+	/* Allocate memory for the nand_chip structure */
-		return -ENODEV;
+	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 (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;
+	data->chip.priv = &data;
-	rnand.cmd_ctrl = rbmips_hwcontrol100;
+	data->mtd.priv = &data->chip;
-	rnand.dev_ready = rb100_dev_ready;
+	data->mtd.owner = THIS_MODULE;
-	p_nand = (void __iomem *)ioremap(( unsigned long)ADM5120_SRAM1_BASE, 0x1000);
+
-	if (!p_nand) {
+	data->chip.IO_ADDR_R = (unsigned char *)KSEG1ADDR(ADM5120_SRAM1_BASE);
-		printk(KERN_WARNING "RB1xx nand Unable ioremap buffer\n");
+	data->chip.IO_ADDR_W = data->chip.IO_ADDR_R;
-		return -ENXIO;
+	data->chip.cmd_ctrl = rbmips_hwcontrol100;
-	}
+	data->chip.dev_ready = rb100_dev_ready;
-	rnand.ecc.mode = NAND_ECC_SOFT;
+	data->chip.ecc.mode = NAND_ECC_SOFT;
-	rnand.ecc.layout = &rb_ecclayout;
+	data->chip.ecc.layout = &rb_ecclayout;
-	rnand.chip_delay = 25;
+	data->chip.chip_delay = 25;
-	rnand.options |= NAND_NO_AUTOINCR;
+	data->chip.options |= NAND_NO_AUTOINCR;
-	rmtd.priv = &rnand;
+
-	if (nand_scan(&rmtd, 1) && nand_scan(&rmtd, 1)
+	platform_set_drvdata(pdev, data);
-	    && nand_scan(&rmtd, 1)  && nand_scan(&rmtd, 1)) {
+
+	/* 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);
+		res = -ENXIO;
-		return -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");
 

target/linux/adm5120-2.6/files/include/asm-mips/mach-adm5120/adm5120_platform.h

@@ -32,8 +32,14 @@
 struct adm5120_flash_platform_data {
 	void			(*set_vpp)(struct map_info *, int);
 	void			(*switch_bank)(unsigned);
+#ifdef CONFIG_MTD_PARTITIONS
 	unsigned int		nr_parts;
 	struct mtd_partition	*parts;
+#endif
+};
+
+struct adm5120_nand_platform_data {
+	/* TODO : not yet implemented */
 };
 
 struct adm5120_switch_platform_data {
@@ -54,11 +60,13 @@ struct adm5120_pci_platform_data {
 
 extern struct adm5120_flash_platform_data adm5120_flash0_data;
 extern struct adm5120_flash_platform_data adm5120_flash1_data;
+extern struct adm5120_nand_platform_data adm5120_nand_data;
 extern struct adm5120_pci_platform_data adm5120_pci_data;
 extern struct adm5120_switch_platform_data adm5120_switch_data;
 
 extern struct platform_device adm5120_flash0_device;
 extern struct platform_device adm5120_flash1_device;
+extern struct platform_device adm5120_nand_device;
 extern struct platform_device adm5120_usbc_device;
 extern struct platform_device adm5120_pci_device;
 extern struct platform_device adm5120_switch_device;