p1022ds: allow for board-specific ngPIXIS functions

The ngPIXIS is an FPGA used on the reference boards of most Freescale PowerPC
SOCs.  Although programming the ngPIXIS is mostly standard on all boards that
have it, the P1022DS is unique in that the ngPIXIS needs to be programmed in
"indirect" mode whenever the video display (DIU) is active.

To support indirect mode, and to make it easier to support other quirks on
future reference boards, the low-level ngPIXIS functions are all marked as
weak, so that board-specific code can override any of them.  We take advantage
of this feature on the P1022DS, so that we can properly reset the board when
the DIU is active.

Signed-off-by: Timur Tabi <timur@freescale.com>
Signed-off-by: Kumar Gala <galak@kernel.crashing.org>

1 files changed, 63 insertions, 3 deletions

diff --git a/board/freescale/p1022ds/diu.c b/board/freescale/p1022ds/diu.c
index 8f5305ca1f..b37e0e269b 100644
--- a/board/freescale/p1022ds/diu.c
+++ b/board/freescale/p1022ds/diu.c
@@ -1,5 +1,5 @@
 /*
- * Copyright 2010 Freescale Semiconductor, Inc.
+ * Copyright 2010-2011 Freescale Semiconductor, Inc.
  * Authors: Timur Tabi <timur@freescale.com>
  *
  * FSL DIU Framebuffer driver
@@ -139,8 +139,6 @@ int platform_diu_init(unsigned int *xres, unsigned int *yres)
 	return fsl_diu_init(*xres, pixel_format, 0);
 }
 
-#ifdef CONFIG_CFI_FLASH_USE_WEAK_ACCESSORS
-
 /*
  * set_mux_to_lbc - disable the DIU so that we can read/write to elbc
  *
@@ -211,6 +209,68 @@ static void set_mux_to_diu(void)
 	in_be32(&gur->pmuxcr);
 }
 
+/*
+ * pixis_read - board-specific function to read from the PIXIS
+ *
+ * This function overrides the generic pixis_read() function, so that it can
+ * use PIXIS indirect mode if necessary.
+ */
+u8 pixis_read(unsigned int reg)
+{
+	ccsr_gur_t *gur = (void *)CONFIG_SYS_MPC85xx_GUTS_ADDR;
+
+	/* Use indirect mode if the mux is currently set to DIU mode */
+	if ((in_be32(&gur->pmuxcr) & PMUXCR_ELBCDIU_MASK) !=
+	    PMUXCR_ELBCDIU_NOR16) {
+		out_8(lbc_lcs0_ba, reg);
+		return in_8(lbc_lcs1_ba);
+	} else {
+		void *p = (void *)PIXIS_BASE;
+
+		return in_8(p + reg);
+	}
+}
+
+/*
+ * pixis_write - board-specific function to write to the PIXIS
+ *
+ * This function overrides the generic pixis_write() function, so that it can
+ * use PIXIS indirect mode if necessary.
+ */
+void pixis_write(unsigned int reg, u8 value)
+{
+	ccsr_gur_t *gur = (void *)CONFIG_SYS_MPC85xx_GUTS_ADDR;
+
+	/* Use indirect mode if the mux is currently set to DIU mode */
+	if ((in_be32(&gur->pmuxcr) & PMUXCR_ELBCDIU_MASK) !=
+	    PMUXCR_ELBCDIU_NOR16) {
+		out_8(lbc_lcs0_ba, reg);
+		out_8(lbc_lcs1_ba, value);
+		/* Do a read-back to ensure the write completed */
+		in_8(lbc_lcs1_ba);
+	} else {
+		void *p = (void *)PIXIS_BASE;
+
+		out_8(p + reg, value);
+	}
+}
+
+void pixis_bank_reset(void)
+{
+	/*
+	 * For some reason, a PIXIS bank reset does not work if the PIXIS is
+	 * in indirect mode, so switch to direct mode first.
+	 */
+	set_mux_to_lbc();
+
+	out_8(&pixis->vctl, 0);
+	out_8(&pixis->vctl, 1);
+
+	while (1);
+}
+
+#ifdef CONFIG_CFI_FLASH_USE_WEAK_ACCESSORS
+
 void flash_write8(u8 value, void *addr)
 {
 	int sw = set_mux_to_lbc();