fbdev: sh_mobile_hdmi: 32bit register access support

Latest SuperH HDMI allows 32bit access only.
But the data is 8bit. So, we can keep compatibility by switching 8/32 bit access.

Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Signed-off-by: Florian Tobias Schandinat <FlorianSchandinat@gmx.de>

2 files changed, 40 insertions, 3 deletions

diff --git a/drivers/video/sh_mobile_hdmi.c b/drivers/video/sh_mobile_hdmi.c
index 0bc39bc976a8..4d48a805dfe1 100644
--- a/drivers/video/sh_mobile_hdmi.c
+++ b/drivers/video/sh_mobile_hdmi.c
@@ -222,20 +222,45 @@ struct sh_hdmi {
         struct delayed_work edid_work;
         struct fb_videomode mode;
         struct fb_monspecs monspec;
+
+        /* register access functions */
+        void (*write)(struct sh_hdmi *hdmi, u8 data, u8 reg);
+        u8 (*read)(struct sh_hdmi *hdmi, u8 reg);
 };
 
 #define entity_to_sh_hdmi(e)    container_of(e, struct sh_hdmi, entity)
 
-static void hdmi_write(struct sh_hdmi *hdmi, u8 data, u8 reg)
+static void __hdmi_write8(struct sh_hdmi *hdmi, u8 data, u8 reg)
 {
         iowrite8(data, hdmi->base + reg);
 }
 
-static u8 hdmi_read(struct sh_hdmi *hdmi, u8 reg)
+static u8 __hdmi_read8(struct sh_hdmi *hdmi, u8 reg)
 {
         return ioread8(hdmi->base + reg);
 }
 
+static void __hdmi_write32(struct sh_hdmi *hdmi, u8 data, u8 reg)
+{
+        iowrite32((u32)data, hdmi->base + (reg * 4));
+        udelay(100);
+}
+
+static u8 __hdmi_read32(struct sh_hdmi *hdmi, u8 reg)
+{
+        return (u8)ioread32(hdmi->base + (reg * 4));
+}
+
+static void hdmi_write(struct sh_hdmi *hdmi, u8 data, u8 reg)
+{
+        hdmi->write(hdmi, data, reg);
+}
+
+static u8 hdmi_read(struct sh_hdmi *hdmi, u8 reg)
+{
+        return hdmi->read(hdmi, reg);
+}
+
 static void hdmi_bit_set(struct sh_hdmi *hdmi, u8 mask, u8 data, u8 reg)
 {
         u8 val = hdmi_read(hdmi, reg);
@@ -1148,6 +1173,15 @@ static int __init sh_hdmi_probe(struct platform_device *pdev)
                 goto egetclk;
         }
 
+        /* select register access functions */
+        if (pdata->flags & HDMI_32BIT_REG) {
+                hdmi->write     = __hdmi_write32;
+                hdmi->read      = __hdmi_read32;
+        } else {
+                hdmi->write     = __hdmi_write8;
+                hdmi->read      = __hdmi_read8;
+        }
+
         /* An arbitrary relaxed pixclock just to get things started: from standard 480p */
         rate = clk_round_rate(hdmi->hdmi_clk, PICOS2KHZ(37037));
         if (rate > 0)
diff --git a/include/video/sh_mobile_hdmi.h b/include/video/sh_mobile_hdmi.h
index 2699635a99ef..ce8a540996c7 100644
--- a/include/video/sh_mobile_hdmi.h
+++ b/include/video/sh_mobile_hdmi.h
@@ -18,10 +18,11 @@ struct clk;
 /*
  * flags format
  *
- * 0x000000BA
+ * 0x00000CBA
  *
  * A: Audio source select
  * B: Int output option
+ * C: Chip specific option
  */
 
 /* Audio source select */
@@ -35,6 +36,8 @@ struct clk;
 #define HDMI_OUTPUT_PUSH_PULL   (1 << 4) /* System control : output mode */
 #define HDMI_OUTPUT_POLARITY_HI (1 << 5) /* System control : output polarity */
 
+/* Chip specific option */
+#define HDMI_32BIT_REG          (1 << 8)
 
 struct sh_mobile_hdmi_info {
         unsigned int                     flags;