TXx9: Add TX4938 ATA support (v3)

Add a helper routine to register tx4938ide driver and use it on
RBTX4938 board.

Signed-off-by: Atsushi Nemoto <anemo@mba.ocn.ne.jp>
Acked-by: Ralf Baechle <ralf@linux-mips.org>
Acked-by: Sergei Shtylyov <sshtylyov@ru.mvista.com>
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>

3 files changed, 61 insertions, 0 deletions

diff --git a/arch/mips/include/asm/txx9/tx4938.h b/arch/mips/include/asm/txx9/tx4938.h
index 989e7751135a..0b068154054c 100644
--- a/arch/mips/include/asm/txx9/tx4938.h
+++ b/arch/mips/include/asm/txx9/tx4938.h
@@ -292,4 +292,17 @@ void tx4938_setup_pcierr_irq(void);
 void tx4938_irq_init(void);
 void tx4938_mtd_init(int ch);
 
+struct tx4938ide_platform_info {
+        /*
+         * I/O port shift, for platforms with ports that are
+         * constantly spaced and need larger than the 1-byte
+         * spacing used by ata_std_ports().
+         */
+        unsigned int ioport_shift;
+        unsigned int gbus_clock;        /*  0 means no PIO mode tuning. */
+        unsigned int ebus_ch;
+};
+
+void tx4938_ata_init(unsigned int irq, unsigned int shift, int tune);
+
 #endif
diff --git a/arch/mips/txx9/generic/setup_tx4938.c b/arch/mips/txx9/generic/setup_tx4938.c
index af724e53ef91..25819ff1c350 100644
--- a/arch/mips/txx9/generic/setup_tx4938.c
+++ b/arch/mips/txx9/generic/setup_tx4938.c
@@ -16,6 +16,7 @@
 #include <linux/param.h>
 #include <linux/ptrace.h>
 #include <linux/mtd/physmap.h>
+#include <linux/platform_device.h>
 #include <asm/reboot.h>
 #include <asm/traps.h>
 #include <asm/txx9irq.h>
@@ -335,6 +336,52 @@ void __init tx4938_mtd_init(int ch)
         txx9_physmap_flash_init(ch, start, size, &pdata);
 }
 
+void __init tx4938_ata_init(unsigned int irq, unsigned int shift, int tune)
+{
+        struct platform_device *pdev;
+        struct resource res[] = {
+                {
+                        /* .start and .end are filled in later */
+                        .flags = IORESOURCE_MEM,
+                }, {
+                        .start = irq,
+                        .flags = IORESOURCE_IRQ,
+                },
+        };
+        struct tx4938ide_platform_info pdata = {
+                .ioport_shift = shift,
+                /*
+                 * The IDE driver should not change bus timings if other ISA
+                 * devices existed.
+                 */
+                .gbus_clock = tune ? txx9_gbus_clock : 0,
+        };
+        u64 ebccr;
+        int i;
+
+        if ((__raw_readq(&tx4938_ccfgptr->pcfg) &
+             (TX4938_PCFG_ATA_SEL | TX4938_PCFG_NDF_SEL))
+            != TX4938_PCFG_ATA_SEL)
+                return;
+        for (i = 0; i < 8; i++) {
+                /* check EBCCRn.ISA, EBCCRn.BSZ, EBCCRn.ME */
+                ebccr = __raw_readq(&tx4938_ebuscptr->cr[i]);
+                if ((ebccr & 0x00f00008) == 0x00e00008)
+                        break;
+        }
+        if (i == 8)
+                return;
+        pdata.ebus_ch = i;
+        res[0].start = ((ebccr >> 48) << 20) + 0x10000;
+        res[0].end = res[0].start + 0x20000 - 1;
+        pdev = platform_device_alloc("tx4938ide", -1);
+        if (!pdev ||
+            platform_device_add_resources(pdev, res, ARRAY_SIZE(res)) ||
+            platform_device_add_data(pdev, &pdata, sizeof(pdata)) ||
+            platform_device_add(pdev))
+                platform_device_put(pdev);
+}
+
 static void __init tx4938_stop_unused_modules(void)
 {
         __u64 pcfg, rst = 0, ckd = 0;
diff --git a/arch/mips/txx9/rbtx4938/setup.c b/arch/mips/txx9/rbtx4938/setup.c
index e077cc4d3a59..547ff2920bf0 100644
--- a/arch/mips/txx9/rbtx4938/setup.c
+++ b/arch/mips/txx9/rbtx4938/setup.c
@@ -352,6 +352,7 @@ static void __init rbtx4938_device_init(void)
         rbtx4938_ne_init();
         tx4938_wdt_init();
         rbtx4938_mtd_init();
+        tx4938_ata_init(RBTX4938_IRQ_IOC_ATA, 0, 1);
         txx9_iocled_init(RBTX4938_LED_ADDR - IO_BASE, -1, 8, 1, "green", NULL);
 }