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>

4 files changed, 83 insertions, 0 deletions

diff --git a/arch/mips/txx9/generic/setup.c b/arch/mips/txx9/generic/setup.c
index fa45f174b0ee..cfa3ccf493bb 100644
--- a/arch/mips/txx9/generic/setup.c
+++ b/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
+}
diff --git a/arch/mips/txx9/generic/setup_tx3927.c b/arch/mips/txx9/generic/setup_tx3927.c
index 06c492576078..9505d58454c8 100644
--- a/arch/mips/txx9/generic/setup_tx3927.c
+++ b/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);
+}
diff --git a/arch/mips/txx9/generic/setup_tx4927.c b/arch/mips/txx9/generic/setup_tx4927.c
index e679c79a4b0f..0840ef930e40 100644
--- a/arch/mips/txx9/generic/setup_tx4927.c
+++ b/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);
+}
diff --git a/arch/mips/txx9/generic/setup_tx4938.c b/arch/mips/txx9/generic/setup_tx4938.c
index 95c058f0a96c..630a7aac61f6 100644
--- a/arch/mips/txx9/generic/setup_tx4938.c
+++ b/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);
+}