brcm63xx: add working lzma-loader and use it for initramfs

Add a working lzma loader and use it for generating initramfs kernels
to allow easily netbooting elf kernels on devices with a 4 MiB CFE
size limit.

Based on ar71xx's lzma-loader.

Signed-off-by: Jonas Gorski <jogo@openwrt.org>

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@41940 3c298f89-4303-0410-b956-a3cf2f4a3e73

1 files changed, 103 insertions, 0 deletions

diff --git a/target/linux/brcm63xx/image/lzma-loader/src/board.c b/target/linux/brcm63xx/image/lzma-loader/src/board.c
new file mode 100644
index 0000000000..1c715e343a
--- /dev/null
+++ b/target/linux/brcm63xx/image/lzma-loader/src/board.c
@@ -0,0 +1,103 @@
+/*
+ * BCM63XX specific implementation parts
+ *
+ * Copyright (C) 2014 Jonas Gorski <jogo@openwrt.org>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 as published
+ * by the Free Software Foundation.
+ */
+
+#include <stddef.h>
+#include "config.h"
+#include "cp0regdef.h"
+
+#define READREG(r)	*(volatile unsigned int *)(r)
+#define WRITEREG(r,v)	*(volatile unsigned int *)(r) = v
+
+#define UART_IR_REG	0x10
+#define UART_FIFO_REG	0x14
+
+unsigned long uart_base;
+
+static void wait_xfered(void)
+{
+        unsigned int val;
+
+        do {
+                val = READREG(uart_base + UART_IR_REG);
+                if (val & (1 << 5))
+                        break;
+        } while (1);
+}
+
+void board_putc(int ch)
+{
+	if (!uart_base)
+		return;
+
+	wait_xfered();
+        WRITEREG(uart_base + UART_FIFO_REG, ch);
+	wait_xfered();
+}
+
+#define PRID_IMP_BMIPS32_REV4	0x4000
+#define PRID_IMP_BMIPS32_REV8	0x8000
+#define PRID_IMP_BMIPS3300	0x9000
+#define PRID_IMP_BMIPS3300_ALT	0x9100
+#define PRID_IMP_BMIPS3300_BUG	0x0000
+#define PRID_IMP_BMIPS43XX	0xa000
+
+void board_init(void)
+{
+	unsigned long prid, chipid, chipid_reg;
+
+	prid = read_32bit_c0_register($15, 0);
+
+	switch (prid & 0xff00) {
+	case PRID_IMP_BMIPS32_REV4:
+	case PRID_IMP_BMIPS32_REV8:
+	case PRID_IMP_BMIPS3300_ALT:
+	case PRID_IMP_BMIPS3300_BUG:
+		chipid_reg = 0xfffe0000;
+		break;
+	case PRID_IMP_BMIPS3300:
+		if ((prid & 0xff) >= 0x33)
+			chipid_reg = 0xb0000000;
+		else
+			chipid_reg = 0xfffe0000;
+		break;
+	case PRID_IMP_BMIPS43XX:
+		if ((prid & 0xff) >= 0x30)
+			chipid_reg = 0xb0000000;
+		else
+			chipid_reg = 0xfffe0000;
+		break;
+	default:
+		return;
+	}
+
+	chipid = READREG(chipid_reg);
+
+	switch (chipid >> 16) {
+	case 0x6318:
+	case 0x6328:
+	case 0x6358:
+	case 0x6362:
+	case 0x6368:
+	case 0x6369:
+		uart_base = chipid_reg + 0x100;
+		break;
+	case 0x6316:
+	case 0x6326:
+		uart_base = chipid_reg + 0x180;
+		break;
+	case 0x6338:
+	case 0x6345:
+	case 0x6348:
+		uart_base = chipid_reg + 0x300;
+		break;
+	default:
+		return;
+	}
+}