1 files changed, 209 insertions, 2 deletions

diff --git a/arch/powerpc/platforms/85xx/p1022_ds.c b/arch/powerpc/platforms/85xx/p1022_ds.c
index 2b390d19a1d1..7eb5c40c069f 100644
--- a/arch/powerpc/platforms/85xx/p1022_ds.c
+++ b/arch/powerpc/platforms/85xx/p1022_ds.c
@@ -8,7 +8,6 @@
  * Copyright 2010 Freescale Semiconductor, Inc.
  *
  * This file is taken from the Freescale P1022DS BSP, with modifications:
- * 1) No DIU support (pending rewrite of DIU code)
  * 2) No AMP support
  * 3) No PCI endpoint support
  *
@@ -20,12 +19,211 @@
 #include <linux/pci.h>
 #include <linux/of_platform.h>
 #include <linux/memblock.h>
-
+#include <asm/div64.h>
 #include <asm/mpic.h>
 #include <asm/swiotlb.h>
 
 #include <sysdev/fsl_soc.h>
 #include <sysdev/fsl_pci.h>
+#include <asm/fsl_guts.h>
+
+#if defined(CONFIG_FB_FSL_DIU) || defined(CONFIG_FB_FSL_DIU_MODULE)
+
+/*
+ * Board-specific initialization of the DIU.  This code should probably be
+ * executed when the DIU is opened, rather than in arch code, but the DIU
+ * driver does not have a mechanism for this (yet).
+ *
+ * This is especially problematic on the P1022DS because the local bus (eLBC)
+ * and the DIU video signals share the same pins, which means that enabling the
+ * DIU will disable access to NOR flash.
+ */
+
+/* DIU Pixel Clock bits of the CLKDVDR Global Utilities register */
+#define CLKDVDR_PXCKEN          0x80000000
+#define CLKDVDR_PXCKINV         0x10000000
+#define CLKDVDR_PXCKDLY         0x06000000
+#define CLKDVDR_PXCLK_MASK      0x00FF0000
+
+/* Some ngPIXIS register definitions */
+#define PX_BRDCFG1_DVIEN        0x80
+#define PX_BRDCFG1_DFPEN        0x40
+#define PX_BRDCFG1_BACKLIGHT    0x20
+#define PX_BRDCFG1_DDCEN        0x10
+
+/*
+ * DIU Area Descriptor
+ *
+ * Note that we need to byte-swap the value before it's written to the AD
+ * register.  So even though the registers don't look like they're in the same
+ * bit positions as they are on the MPC8610, the same value is written to the
+ * AD register on the MPC8610 and on the P1022.
+ */
+#define AD_BYTE_F               0x10000000
+#define AD_ALPHA_C_MASK         0x0E000000
+#define AD_ALPHA_C_SHIFT        25
+#define AD_BLUE_C_MASK          0x01800000
+#define AD_BLUE_C_SHIFT         23
+#define AD_GREEN_C_MASK         0x00600000
+#define AD_GREEN_C_SHIFT        21
+#define AD_RED_C_MASK           0x00180000
+#define AD_RED_C_SHIFT          19
+#define AD_PALETTE              0x00040000
+#define AD_PIXEL_S_MASK         0x00030000
+#define AD_PIXEL_S_SHIFT        16
+#define AD_COMP_3_MASK          0x0000F000
+#define AD_COMP_3_SHIFT         12
+#define AD_COMP_2_MASK          0x00000F00
+#define AD_COMP_2_SHIFT         8
+#define AD_COMP_1_MASK          0x000000F0
+#define AD_COMP_1_SHIFT         4
+#define AD_COMP_0_MASK          0x0000000F
+#define AD_COMP_0_SHIFT         0
+
+#define MAKE_AD(alpha, red, blue, green, size, c0, c1, c2, c3) \
+        cpu_to_le32(AD_BYTE_F | (alpha << AD_ALPHA_C_SHIFT) | \
+        (blue << AD_BLUE_C_SHIFT) | (green << AD_GREEN_C_SHIFT) | \
+        (red << AD_RED_C_SHIFT) | (c3 << AD_COMP_3_SHIFT) | \
+        (c2 << AD_COMP_2_SHIFT) | (c1 << AD_COMP_1_SHIFT) | \
+        (c0 << AD_COMP_0_SHIFT) | (size << AD_PIXEL_S_SHIFT))
+
+/**
+ * p1022ds_get_pixel_format: return the Area Descriptor for a given pixel depth
+ *
+ * The Area Descriptor is a 32-bit value that determine which bits in each
+ * pixel are to be used for each color.
+ */
+static unsigned int p1022ds_get_pixel_format(unsigned int bits_per_pixel,
+        int monitor_port)
+{
+        switch (bits_per_pixel) {
+        case 32:
+                /* 0x88883316 */
+                return MAKE_AD(3, 2, 0, 1, 3, 8, 8, 8, 8);
+        case 24:
+                /* 0x88082219 */
+                return MAKE_AD(4, 0, 1, 2, 2, 0, 8, 8, 8);
+        case 16:
+                /* 0x65053118 */
+                return MAKE_AD(4, 2, 1, 0, 1, 5, 6, 5, 0);
+        default:
+                pr_err("fsl-diu: unsupported pixel depth %u\n", bits_per_pixel);
+                return 0;
+        }
+}
+
+/**
+ * p1022ds_set_gamma_table: update the gamma table, if necessary
+ *
+ * On some boards, the gamma table for some ports may need to be modified.
+ * This is not the case on the P1022DS, so we do nothing.
+*/
+static void p1022ds_set_gamma_table(int monitor_port, char *gamma_table_base)
+{
+}
+
+/**
+ * p1022ds_set_monitor_port: switch the output to a different monitor port
+ *
+ */
+static void p1022ds_set_monitor_port(int monitor_port)
+{
+        struct device_node *pixis_node;
+        u8 __iomem *brdcfg1;
+
+        pixis_node = of_find_compatible_node(NULL, NULL, "fsl,p1022ds-pixis");
+        if (!pixis_node) {
+                pr_err("p1022ds: missing ngPIXIS node\n");
+                return;
+        }
+
+        brdcfg1 = of_iomap(pixis_node, 0);
+        if (!brdcfg1) {
+                pr_err("p1022ds: could not map ngPIXIS registers\n");
+                return;
+        }
+        brdcfg1 += 9;   /* BRDCFG1 is at offset 9 in the ngPIXIS */
+
+        switch (monitor_port) {
+        case 0: /* DVI */
+                /* Enable the DVI port, disable the DFP and the backlight */
+                clrsetbits_8(brdcfg1, PX_BRDCFG1_DFPEN | PX_BRDCFG1_BACKLIGHT,
+                             PX_BRDCFG1_DVIEN);
+                break;
+        case 1: /* Single link LVDS */
+                /* Enable the DFP port, disable the DVI and the backlight */
+                clrsetbits_8(brdcfg1, PX_BRDCFG1_DVIEN | PX_BRDCFG1_BACKLIGHT,
+                             PX_BRDCFG1_DFPEN);
+                break;
+        default:
+                pr_err("p1022ds: unsupported monitor port %i\n", monitor_port);
+        }
+}
+
+/**
+ * p1022ds_set_pixel_clock: program the DIU's clock
+ *
+ * @pixclock: the wavelength, in picoseconds, of the clock
+ */
+void p1022ds_set_pixel_clock(unsigned int pixclock)
+{
+        struct device_node *guts_np = NULL;
+        struct ccsr_guts_85xx __iomem *guts;
+        unsigned long freq;
+        u64 temp;
+        u32 pxclk;
+
+        /* Map the global utilities registers. */
+        guts_np = of_find_compatible_node(NULL, NULL, "fsl,p1022-guts");
+        if (!guts_np) {
+                pr_err("p1022ds: missing global utilties device node\n");
+                return;
+        }
+
+        guts = of_iomap(guts_np, 0);
+        of_node_put(guts_np);
+        if (!guts) {
+                pr_err("p1022ds: could not map global utilties device\n");
+                return;
+        }
+
+        /* Convert pixclock from a wavelength to a frequency */
+        temp = 1000000000000ULL;
+        do_div(temp, pixclock);
+        freq = temp;
+
+        /* pixclk is the ratio of the platform clock to the pixel clock */
+        pxclk = DIV_ROUND_CLOSEST(fsl_get_sys_freq(), freq);
+
+        /* Disable the pixel clock, and set it to non-inverted and no delay */
+        clrbits32(&guts->clkdvdr,
+                  CLKDVDR_PXCKEN | CLKDVDR_PXCKDLY | CLKDVDR_PXCLK_MASK);
+
+        /* Enable the clock and set the pxclk */
+        setbits32(&guts->clkdvdr, CLKDVDR_PXCKEN | (pxclk << 16));
+}
+
+/**
+ * p1022ds_show_monitor_port: show the current monitor
+ *
+ * This function returns a string indicating whether the current monitor is
+ * set to DVI or LVDS.
+ */
+ssize_t p1022ds_show_monitor_port(int monitor_port, char *buf)
+{
+        return sprintf(buf, "%c0 - DVI\n%c1 - Single link LVDS\n",
+                monitor_port == 0 ? '*' : ' ', monitor_port == 1 ? '*' : ' ');
+}
+
+/**
+ * p1022ds_set_sysfs_monitor_port: set the monitor port for sysfs
+ */
+int p1022ds_set_sysfs_monitor_port(int val)
+{
+        return val < 2 ? val : 0;
+}
+
+#endif
 
 void __init p1022_ds_pic_init(void)
 {
@@ -92,6 +290,15 @@ static void __init p1022_ds_setup_arch(void)
         }
 #endif
 
+#if defined(CONFIG_FB_FSL_DIU) || defined(CONFIG_FB_FSL_DIU_MODULE)
+        diu_ops.get_pixel_format        = p1022ds_get_pixel_format;
+        diu_ops.set_gamma_table         = p1022ds_set_gamma_table;
+        diu_ops.set_monitor_port        = p1022ds_set_monitor_port;
+        diu_ops.set_pixel_clock         = p1022ds_set_pixel_clock;
+        diu_ops.show_monitor_port       = p1022ds_show_monitor_port;
+        diu_ops.set_sysfs_monitor_port  = p1022ds_set_sysfs_monitor_port;
+#endif
+
 #ifdef CONFIG_SMP
         mpc85xx_smp_init();
 #endif