Add preliminary RouterBoard RB1xx support

SVN-Revision: 6839

1 files changed, 196 insertions, 0 deletions

diff --git a/target/linux/rb1xx-2.6/files/drivers/mtd/nand/rbmipsnand.c b/target/linux/rb1xx-2.6/files/drivers/mtd/nand/rbmipsnand.c
new file mode 100644
index 0000000..9d6588a
--- /dev/null
+++ b/target/linux/rb1xx-2.6/files/drivers/mtd/nand/rbmipsnand.c
@@ -0,0 +1,196 @@
+#include <linux/init.h>
+#include <linux/mtd/nand.h>
+#include <linux/mtd/mtd.h>
+#include <linux/mtd/partitions.h>
+#include <linux/delay.h>
+#include <asm/io.h>
+#include <asm/irq.h>
+#include <asm/bootinfo.h>
+#ifdef CONFIG_MIPS_ADM5120
+#include <asm/mach-adm5120/adm5120_defs.h>
+#endif
+
+#define IDT434_REG_BASE ((volatile void *) KSEG1ADDR(0x18000000))
+
+#define GPIOF 0x050000
+#define GPIOC 0x050004
+#define GPIOD 0x050008
+
+#define GPIO_RDY (1 << 0x08)
+#define GPIO_WPX (1 << 0x09)
+#define GPIO_ALE (1 << 0x0a)
+#define GPIO_CLE (1 << 0x0b)
+
+#define DEV2BASE 0x010020
+
+#define LO_WPX   (1 << 0)
+#define LO_ALE   (1 << 1)
+#define LO_CLE   (1 << 2)
+#define LO_CEX   (1 << 3)
+#define LO_FOFF  (1 << 5)
+#define LO_SPICS (1 << 6)
+#define LO_ULED  (1 << 7)
+
+#define MEM32(x) *((volatile unsigned *) (x))
+
+
+/* RouterBoard RB1xx specific definitions */
+#define SMEM1(x) (*((volatile unsigned char *) (KSEG1ADDR(ADM5120_SRAM1_BASE) + x)))
+
+#define NAND_RW_REG     0x0     //data register
+#define NAND_SET_CEn    0x1     //CE# low
+#define NAND_CLR_CEn    0x2     //CE# high
+#define NAND_CLR_CLE    0x3     //CLE low
+#define NAND_SET_CLE    0x4     //CLE high
+#define NAND_CLR_ALE    0x5     //ALE low
+#define NAND_SET_ALE    0x6     //ALE high
+#define NAND_SET_SPn    0x7     //SP# low (use spare area)
+#define NAND_CLR_SPn    0x8     //SP# high (do not use spare area)
+#define NAND_SET_WPn    0x9     //WP# low
+#define NAND_CLR_WPn    0xA     //WP# high
+#define NAND_STS_REG    0xB     //Status register
+
+static void __iomem *p_nand;
+
+#ifdef CONFIG_MIKROTIK_RB500
+extern void changeLatchU5(unsigned char orMask, unsigned char nandMask);
+
+static int rb500_dev_ready(struct mtd_info *mtd)
+{
+	return MEM32(IDT434_REG_BASE + GPIOD) & GPIO_RDY;
+}
+
+/*
+ * hardware specific access to control-lines
+ *
+ * ctrl:
+ *     NAND_CLE: bit 2 -> bit 3 
+ *     NAND_ALE: bit 3 -> bit 2
+ */
+static void rbmips_hwcontrol500(struct mtd_info *mtd, int cmd,
+				unsigned int ctrl)
+{
+	struct nand_chip *chip = mtd->priv;
+	unsigned char orbits, nandbits;
+
+	if (ctrl & NAND_CTRL_CHANGE) {
+
+		orbits = (ctrl & NAND_CLE) << 1;
+		orbits |= (ctrl & NAND_ALE) >> 1;
+
+		nandbits = (~ctrl & NAND_CLE) << 1;
+		nandbits |= (~ctrl & NAND_ALE) >> 1;
+
+		changeLatchU5(orbits, nandbits);
+	}
+	if (cmd != NAND_CMD_NONE)
+		writeb(cmd, chip->IO_ADDR_W);
+
+}
+#endif
+
+#ifdef CONFIG_MIPS_ADM5120
+static int rb100_dev_ready(struct mtd_info *mtd)
+{
+	return SMEM1(NAND_STS_REG) & 0x80; /* found out by experiment */
+}
+
+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) = 0x01;
+	if (cmd != NAND_CMD_NONE)
+		writeb(cmd, chip->IO_ADDR_W);
+}
+#endif
+
+
+static struct mtd_partition partition_info[] = {
+	{
+	      name:"RouterBoard NAND Boot",
+	      offset:0,
+      size:4 * 1024 * 1024},
+	{
+	      name:"RouterBoard NAND Main",
+	      offset:MTDPART_OFS_NXTBLK,
+      size:MTDPART_SIZ_FULL}
+};
+
+static struct mtd_info rmtd;
+static struct nand_chip rnand;
+
+static unsigned init_ok = 0;
+
+unsigned get_rbnand_block_size(void)
+{
+	if (init_ok)
+		return rmtd.writesize;
+	else
+		return 0;
+}
+
+EXPORT_SYMBOL(get_rbnand_block_size);
+
+int __init rbmips_init(void)
+{
+	memset(&rmtd, 0, sizeof(rmtd));
+	memset(&rnand, 0, sizeof(rnand));
+
+#ifdef CONFIG_MIKROTIK_RB500
+	printk("RB500 nand\n");
+	changeLatchU5(LO_WPX | LO_FOFF | LO_CEX,
+		      LO_ULED | LO_ALE | LO_CLE);
+	rnand.cmd_ctrl = rbmips_hwcontrol500;
+
+	rnand.dev_ready = rb500_dev_ready;
+	rnand.IO_ADDR_W = (unsigned char *)
+	    KSEG1ADDR(MEM32(IDT434_REG_BASE + DEV2BASE));
+	rnand.IO_ADDR_R = rnand.IO_ADDR_W;
+#endif
+
+#ifdef CONFIG_MIPS_ADM5120
+	printk("RB100 nand\n");
+	/* enable NAND flash */
+	MEM32(0xB2000064) = 0x100;
+	/* boot done */
+	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;
+#endif
+	p_nand = (void __iomem *) ioremap((void *) 0x18a20000, 0x1000);
+	if (!p_nand) {
+		printk("RBnand Unable ioremap buffer");
+		return -ENXIO;
+	}
+	rnand.ecc.mode = NAND_ECC_SOFT;
+	rnand.chip_delay = 25;
+	rnand.options |= NAND_NO_AUTOINCR;
+	rmtd.priv = &rnand;
+
+#ifdef CONFIG_MIKROTIK_RB500
+	int *b;
+
+	b = (int *) KSEG1ADDR(0x18010020);
+	printk("dev2base 0x%08x mask 0x%08x c 0x%08x tc 0x%08x\n", b[0],
+	       b[1], b[2], b[3]);
+#endif
+
+	if (nand_scan(&rmtd, 1) && nand_scan(&rmtd, 1)
+	    && nand_scan(&rmtd, 1) && nand_scan(&rmtd, 1)) {
+		printk("RBxxx nand device not found");
+		iounmap((void *) p_nand);
+		return -ENXIO;
+	}
+
+	add_mtd_partitions(&rmtd, partition_info, 2);
+	init_ok = 1;
+	return 0;
+}
+
+module_init(rbmips_init);