video: ARM CLCD: support Nomadik variant

The Nomadik variant has a few special quirks that need to be respected
to make the driver work:

- The block need to be clocked during writing of the TIMn registers
  or the bus will stall.
- Special bits in the control register select how many of the output
  display lines get activated.
- Special bits in the control register select how to manage the
  different 565 and 5551 modes.
- There is a packed 24bit graphics mode, i.e 888 pixels can be stored
  in memory is three consecutive bytes, not evenly aligned to a 32bit
  word.

This patch uses the vendor data pointer from the AMBA matching mechanism
to track the quirks for this variant, and adds two hooks that variants
can use to initialize boards and panels during start-up. These will
later be used to adopt a Nomadik board profile.

Cc: Pawel Moll <pawel.moll@arm.com>
Cc: Rob Herring <robh@kernel.org>
Cc: Russell King <linux@arm.linux.org.uk>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>

1 files changed, 42 insertions, 0 deletions

diff --git a/include/linux/amba/clcd.h b/include/linux/amba/clcd.h
index 8b64ec0d574b..1035879b322c 100644
--- a/include/linux/amba/clcd.h
+++ b/include/linux/amba/clcd.h
@@ -67,6 +67,17 @@
 #define CNTL_LDMAFIFOTIME       (1 << 15)
 #define CNTL_WATERMARK          (1 << 16)
 
+/* ST Microelectronics variant bits */
+#define CNTL_ST_1XBPP_444       0x0
+#define CNTL_ST_1XBPP_5551      (1 << 17)
+#define CNTL_ST_1XBPP_565       (1 << 18)
+#define CNTL_ST_CDWID_12        0x0
+#define CNTL_ST_CDWID_16        (1 << 19)
+#define CNTL_ST_CDWID_18        (1 << 20)
+#define CNTL_ST_CDWID_24        ((1 << 19)|(1 << 20))
+#define CNTL_ST_CEAEN           (1 << 21)
+#define CNTL_ST_LCDBPP24_PACKED (6 << 1)
+
 enum {
         /* individual formats */
         CLCD_CAP_RGB444         = (1 << 0),
@@ -179,11 +190,38 @@ struct clcd_board {
 struct amba_device;
 struct clk;
 
+/**
+ * struct clcd_vendor_data - holds hardware (IP-block) vendor-specific
+ * variant information
+ *
+ * @clock_timregs: the CLCD needs to be clocked when accessing the
+ * timer registers, or the hardware will hang.
+ * @packed_24_bit_pixels: this variant supports 24bit packed pixel data,
+ * so that RGB accesses 3 bytes at a time, not just on even 32bit
+ * boundaries, packing the pixel data in memory. ST Microelectronics
+ * have this.
+ * @st_bitmux_control: ST Microelectronics have implemented output
+ * bit line multiplexing into the CLCD control register. This indicates
+ * that we need to use this.
+ * @init_board: custom board init function for this variant
+ * @init_panel: custom panel init function for this variant
+ */
+struct clcd_vendor_data {
+        bool    clock_timregs;
+        bool    packed_24_bit_pixels;
+        bool    st_bitmux_control;
+        int     (*init_board)(struct amba_device *adev,
+                              struct clcd_board *board);
+        int     (*init_panel)(struct clcd_fb *fb,
+                              struct device_node *panel);
+};
+
 /* this data structure describes each frame buffer device we find */
 struct clcd_fb {
         struct fb_info          fb;
         struct amba_device      *dev;
         struct clk              *clk;
+        struct clcd_vendor_data *vendor;
         struct clcd_panel       *panel;
         struct clcd_board       *board;
         void                    *board_data;
@@ -285,6 +323,10 @@ static inline void clcdfb_decode(struct clcd_fb *fb, struct clcd_regs *regs)
                 else
                         val |= CNTL_LCDBPP16_444;
                 break;
+        case 24:
+                /* Modified variant supporting 24 bit packed pixels */
+                val |= CNTL_ST_LCDBPP24_PACKED;
+                break;
         case 32:
                 val |= CNTL_LCDBPP24;
                 break;