MIPS: TXx9: Add mtd support

Add helper routines to register physmap-flash platform devices for NOR
flashes.

Signed-off-by: Atsushi Nemoto <anemo@mba.ocn.ne.jp>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

arch/mips/txx9/generic/setup.c

@@ -22,6 +22,7 @@
 #include <linux/gpio.h>
 #include <linux/platform_device.h>
 #include <linux/serial_core.h>
+#include <linux/mtd/physmap.h>
 #include <asm/bootinfo.h>
 #include <asm/time.h>
 #include <asm/reboot.h>
@@ -593,3 +594,43 @@ static unsigned long __swizzle_addr_none(unsigned long port)
 unsigned long (*__swizzle_addr_b)(unsigned long port) = __swizzle_addr_none;
 EXPORT_SYMBOL(__swizzle_addr_b);
 #endif
+
+void __init txx9_physmap_flash_init(int no, unsigned long addr,
+				    unsigned long size,
+				    const struct physmap_flash_data *pdata)
+{
+#if defined(CONFIG_MTD_PHYSMAP) || defined(CONFIG_MTD_PHYSMAP_MODULE)
+	struct resource res = {
+		.start = addr,
+		.end = addr + size - 1,
+		.flags = IORESOURCE_MEM,
+	};
+	struct platform_device *pdev;
+#ifdef CONFIG_MTD_PARTITIONS
+	static struct mtd_partition parts[2];
+	struct physmap_flash_data pdata_part;
+
+	/* If this area contained boot area, make separate partition */
+	if (pdata->nr_parts == 0 && !pdata->parts &&
+	    addr < 0x1fc00000 && addr + size > 0x1fc00000 &&
+	    !parts[0].name) {
+		parts[0].name = "boot";
+		parts[0].offset = 0x1fc00000 - addr;
+		parts[0].size = addr + size - 0x1fc00000;
+		parts[1].name = "user";
+		parts[1].offset = 0;
+		parts[1].size = 0x1fc00000 - addr;
+		pdata_part = *pdata;
+		pdata_part.nr_parts = ARRAY_SIZE(parts);
+		pdata_part.parts = parts;
+		pdata = &pdata_part;
+	}
+#endif
+	pdev = platform_device_alloc("physmap-flash", no);
+	if (!pdev ||
+	    platform_device_add_resources(pdev, &res, 1) ||
+	    platform_device_add_data(pdev, pdata, sizeof(*pdata)) ||
+	    platform_device_add(pdev))
+		platform_device_put(pdev);
+#endif
+}

arch/mips/txx9/generic/setup_tx3927.c

@@ -15,6 +15,7 @@
 #include <linux/delay.h>
 #include <linux/param.h>
 #include <linux/io.h>
+#include <linux/mtd/physmap.h>
 #include <asm/mipsregs.h>
 #include <asm/txx9irq.h>
 #include <asm/txx9tmr.h>
@@ -121,3 +122,16 @@ void __init tx3927_sio_init(unsigned int sclk, unsigned int cts_mask)
 			      TXX9_IRQ_BASE + TX3927_IR_SIO(i),
 			      i, sclk, (1 << i) & cts_mask);
 }
+
+void __init tx3927_mtd_init(int ch)
+{
+	struct physmap_flash_data pdata = {
+		.width = TX3927_ROMC_WIDTH(ch) / 8,
+	};
+	unsigned long start = txx9_ce_res[ch].start;
+	unsigned long size = txx9_ce_res[ch].end - start + 1;
+
+	if (!(tx3927_romcptr->cr[ch] & 0x8))
+		return;	/* disabled */
+	txx9_physmap_flash_init(ch, start, size, &pdata);
+}

arch/mips/txx9/generic/setup_tx4927.c

@@ -14,6 +14,7 @@
 #include <linux/ioport.h>
 #include <linux/delay.h>
 #include <linux/param.h>
+#include <linux/mtd/physmap.h>
 #include <asm/txx9irq.h>
 #include <asm/txx9tmr.h>
 #include <asm/txx9pio.h>
@@ -187,3 +188,16 @@ void __init tx4927_sio_init(unsigned int sclk, unsigned int cts_mask)
 			      TXX9_IRQ_BASE + TX4927_IR_SIO(i),
 			      i, sclk, (1 << i) & cts_mask);
 }
+
+void __init tx4927_mtd_init(int ch)
+{
+	struct physmap_flash_data pdata = {
+		.width = TX4927_EBUSC_WIDTH(ch) / 8,
+	};
+	unsigned long start = txx9_ce_res[ch].start;
+	unsigned long size = txx9_ce_res[ch].end - start + 1;
+
+	if (!(TX4927_EBUSC_CR(ch) & 0x8))
+		return;	/* disabled */
+	txx9_physmap_flash_init(ch, start, size, &pdata);
+}

arch/mips/txx9/generic/setup_tx4938.c

@@ -14,6 +14,7 @@
 #include <linux/ioport.h>
 #include <linux/delay.h>
 #include <linux/param.h>
+#include <linux/mtd/physmap.h>
 #include <asm/txx9irq.h>
 #include <asm/txx9tmr.h>
 #include <asm/txx9pio.h>
@@ -269,3 +270,16 @@ void __init tx4938_ethaddr_init(unsigned char *addr0, unsigned char *addr1)
 	if (addr1 && (pcfg & TX4938_PCFG_ETH1_SEL))
 		txx9_ethaddr_init(TXX9_IRQ_BASE + TX4938_IR_ETH1, addr1);
 }
+
+void __init tx4938_mtd_init(int ch)
+{
+	struct physmap_flash_data pdata = {
+		.width = TX4938_EBUSC_WIDTH(ch) / 8,
+	};
+	unsigned long start = txx9_ce_res[ch].start;
+	unsigned long size = txx9_ce_res[ch].end - start + 1;
+
+	if (!(TX4938_EBUSC_CR(ch) & 0x8))
+		return;	/* disabled */
+	txx9_physmap_flash_init(ch, start, size, &pdata);
+}