p2020ds: add alternate boot bank support using the ngPIXIS FPGA

The Freescale P2020DS board uses a new type of PIXIS FPGA, called the ngPIXIS.
The ngPIXIS has one distinct new feature: the values of the on-board switches
can be selectively overridden with shadow registers.  This feature is used to
boot from a different NOR flash bank, instead of having a register dedicated
for this purpose.  Because the ngPIXIS is so different from the previous PIXIS,
a new file is introduced: ngpixis.c.

Also update the P2020DS checkboard() function to use the new macros defined
in the header file.

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

1 files changed, 57 insertions, 0 deletions

diff --git a/board/freescale/common/ngpixis.h b/board/freescale/common/ngpixis.h
new file mode 100644
index 0000000..284d044
--- /dev/null
+++ b/board/freescale/common/ngpixis.h
@@ -0,0 +1,57 @@
+/**
+ * Copyright 2010 Freescale Semiconductor
+ * Author: Timur Tabi <timur@freescale.com>
+ *
+ * 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.
+ *
+ * This file provides support for the ngPIXIS, a board-specific FPGA used on
+ * some Freescale reference boards.
+ */
+
+/* ngPIXIS register set. Hopefully, this won't change too much over time.
+ * Feel free to add board-specific #ifdefs where necessary.
+ */
+typedef struct ngpixis {
+	u8 id;
+	u8 arch;
+	u8 scver;
+	u8 csr;
+	u8 rst;
+	u8 res1;
+	u8 aux;
+	u8 spd;
+	u8 brdcfg0;
+	u8 dma;
+	u8 addr;
+	u8 res2[2];
+	u8 data;
+	u8 led;
+	u8 res3;
+	u8 vctl;
+	u8 vstat;
+	u8 vcfgen0;
+	u8 res4;
+	u8 ocmcsr;
+	u8 ocmmsg;
+	u8 gmdbg;
+	u8 res5[2];
+	u8 sclk[3];
+	u8 dclk[3];
+	u8 watch;
+	struct {
+		u8 sw;
+		u8 en;
+	} s[8];
+} ngpixis_t  __attribute__ ((aligned(1)));
+
+/* Pointer to the PIXIS register set */
+#define pixis ((ngpixis_t *)PIXIS_BASE)
+
+/* The PIXIS SW register that corresponds to board switch X, where x >= 1 */
+#define PIXIS_SW(x)		(pixis->s[(x) - 1].sw)
+
+/* The PIXIS EN register that corresponds to board switch X, where x >= 1 */
+#define PIXIS_EN(x)		(pixis->s[(x) - 1].en)