powerpc/85xx: Enable display support for t1042rdb

Add a diu_ops implementation for t1042rdb.

Signed-off-by: Jason Jin <jason.jin@nxp.com>
[Meng Yi: Made file t1042rdb-specific]
Signed-off-by: Meng Yi <meng.yi@nxp.com>
[scottwood: clean up commit message]
Signed-off-by: Scott Wood <oss@buserror.net>

diff --git a/arch/powerpc/platforms/85xx/Makefile b/arch/powerpc/platforms/85xx/Makefile
index 7bc86dae9517654cc14a379c6022f56b05f00f9f..fe19dad568e2d2c4e01a798326db6169838ec200 100644 (file)
--- a/arch/powerpc/platforms/85xx/Makefile
+++ b/arch/powerpc/platforms/85xx/Makefile
@@ -22,6 +22,7 @@ obj-$(CONFIG_P1022_RDK)   += p1022_rdk.o
 obj-$(CONFIG_P1023_RDB)   += p1023_rdb.o
 obj-$(CONFIG_TWR_P102x)   += twr_p102x.o
 obj-$(CONFIG_CORENET_GENERIC)   += corenet_generic.o
+obj-$(CONFIG_FB_FSL_DIU)       += t1042rdb_diu.o
 obj-$(CONFIG_STX_GP3)    += stx_gp3.o
 obj-$(CONFIG_TQM85xx)    += tqm85xx.o
 obj-$(CONFIG_SBC8548)     += sbc8548.o

diff --git a/arch/powerpc/platforms/85xx/t1042rdb_diu.c b/arch/powerpc/platforms/85xx/t1042rdb_diu.c
new file mode 100644 (file)
index 0000000..58fa3d3
--- /dev/null
+++ b/arch/powerpc/platforms/85xx/t1042rdb_diu.c
@@ -0,0 +1,152 @@
+/*
+ * T1042 platform DIU operation
+ *
+ * Copyright 2014 Freescale Semiconductor Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.
+ */
+
+#include <linux/io.h>
+#include <linux/kernel.h>
+#include <linux/of.h>
+#include <linux/of_address.h>
+
+#include <sysdev/fsl_soc.h>
+
+/*DIU Pixel ClockCR offset in scfg*/
+#define CCSR_SCFG_PIXCLKCR      0x28
+
+/* DIU Pixel Clock bits of the PIXCLKCR */
+#define PIXCLKCR_PXCKEN                0x80000000
+#define PIXCLKCR_PXCKINV       0x40000000
+#define PIXCLKCR_PXCKDLY       0x0000FF00
+#define PIXCLKCR_PXCLK_MASK    0x00FF0000
+
+/* Some CPLD register definitions */
+#define CPLD_DIUCSR            0x16
+#define CPLD_DIUCSR_DVIEN      0x80
+#define CPLD_DIUCSR_BACKLIGHT  0x0f
+
+struct device_node *cpld_node;
+
+/**
+ * t1042rdb_set_monitor_port: switch the output to a different monitor port
+ */
+static void t1042rdb_set_monitor_port(enum fsl_diu_monitor_port port)
+{
+       static void __iomem *cpld_base;
+
+       cpld_base = of_iomap(cpld_node, 0);
+       if (!cpld_base) {
+               pr_err("%s: Could not map cpld registers\n", __func__);
+               goto exit;
+       }
+
+       switch (port) {
+       case FSL_DIU_PORT_DVI:
+               /* Enable the DVI(HDMI) port, disable the DFP and
+                * the backlight
+                */
+               clrbits8(cpld_base + CPLD_DIUCSR, CPLD_DIUCSR_DVIEN);
+               break;
+       case FSL_DIU_PORT_LVDS:
+               /*
+                * LVDS also needs backlight enabled, otherwise the display
+                * will be blank.
+                */
+               /* Enable the DFP port, disable the DVI*/
+               setbits8(cpld_base + CPLD_DIUCSR, 0x01 << 8);
+               setbits8(cpld_base + CPLD_DIUCSR, 0x01 << 4);
+               setbits8(cpld_base + CPLD_DIUCSR, CPLD_DIUCSR_BACKLIGHT);
+               break;
+       default:
+               pr_err("%s: Unsupported monitor port %i\n", __func__, port);
+       }
+
+       iounmap(cpld_base);
+exit:
+       of_node_put(cpld_node);
+}
+
+/**
+ * t1042rdb_set_pixel_clock: program the DIU's clock
+ * @pixclock: pixel clock in ps (pico seconds)
+ */
+static void t1042rdb_set_pixel_clock(unsigned int pixclock)
+{
+       struct device_node *scfg_np;
+       void __iomem *scfg;
+       unsigned long freq;
+       u64 temp;
+       u32 pxclk;
+
+       scfg_np = of_find_compatible_node(NULL, NULL, "fsl,t1040-scfg");
+       if (!scfg_np) {
+               pr_err("%s: Missing scfg node. Can not display video.\n",
+                      __func__);
+               return;
+       }
+
+       scfg = of_iomap(scfg_np, 0);
+       of_node_put(scfg_np);
+       if (!scfg) {
+               pr_err("%s: Could not map device. Can not display video.\n",
+                      __func__);
+               return;
+       }
+
+       /* Convert pixclock into frequency */
+       temp = 1000000000000ULL;
+       do_div(temp, pixclock);
+       freq = temp;
+
+       /*
+        * 'pxclk' is the ratio of the platform clock to the pixel clock.
+        * This number is programmed into the PIXCLKCR register, and the valid
+        * range of values is 2-255.
+        */
+       pxclk = DIV_ROUND_CLOSEST(fsl_get_sys_freq(), freq);
+       pxclk = clamp_t(u32, pxclk, 2, 255);
+
+       /* Disable the pixel clock, and set it to non-inverted and no delay */
+       clrbits32(scfg + CCSR_SCFG_PIXCLKCR,
+                 PIXCLKCR_PXCKEN | PIXCLKCR_PXCKDLY | PIXCLKCR_PXCLK_MASK);
+
+       /* Enable the clock and set the pxclk */
+       setbits32(scfg + CCSR_SCFG_PIXCLKCR, PIXCLKCR_PXCKEN | (pxclk << 16));
+
+       iounmap(scfg);
+}
+
+/**
+ * t1042rdb_valid_monitor_port: set the monitor port for sysfs
+ */
+static enum fsl_diu_monitor_port
+t1042rdb_valid_monitor_port(enum fsl_diu_monitor_port port)
+{
+       switch (port) {
+       case FSL_DIU_PORT_DVI:
+       case FSL_DIU_PORT_LVDS:
+               return port;
+       default:
+               return FSL_DIU_PORT_DVI; /* Dual-link LVDS is not supported */
+       }
+}
+
+static int __init t1042rdb_diu_init(void)
+{
+       cpld_node = of_find_compatible_node(NULL, NULL, "fsl,t1042rdb-cpld");
+       if (!cpld_node)
+               return 0;
+
+       diu_ops.set_monitor_port        = t1042rdb_set_monitor_port;
+       diu_ops.set_pixel_clock         = t1042rdb_set_pixel_clock;
+       diu_ops.valid_monitor_port      = t1042rdb_valid_monitor_port;
+
+       return 0;
+}
+
+early_initcall(t1042rdb_diu_init);