1 files changed, 392 insertions, 0 deletions
diff --git a/board/pb1x00/lowlevel_init.S b/board/pb1x00/lowlevel_init.S
new file mode 100644
index 000000000..e851e2fed
--- /dev/null
+++ b/board/pb1x00/lowlevel_init.S
@@ -0,0 +1,392 @@
+/* Memory sub-system initialization code */
+
+#include <config.h>
+#include <version.h>
+#include <asm/regdef.h>
+#include <asm/au1x00.h>
+#include <asm/mipsregs.h>
+
+#define AU1500_SYS_ADDR		0xB1900000
+#define sys_endian		0x0038
+#define CP0_Config0		$16
+#define MEM_1MS			((396000000/1000000) * 1000)
+
+	.text
+	.set noreorder
+	.set mips32
+
+	.globl	lowlevel_init
+lowlevel_init:
+	/*
+	 * Step 1) Establish CPU endian mode.
+	 * NOTE: A fair amount of code is necessary on the Pb1000 to
+	 * obtain the value of Switch S8.1 which is used to determine
+	 * endian at run-time.
+	 */
+
+	/* RCE1 */
+	li		t0, MEM_STCFG1
+	li		t1, 0x00000083
+	sw		t1, 0(t0)
+
+	li		t0, MEM_STTIME1
+	li		t1, 0x33030A10
+	sw		t1, 0(t0)
+
+	li		t0, MEM_STADDR1
+	li		t1, 0x11803E40
+	sw		t1, 0(t0)
+
+	/* Set DSTRB bits so switch will read correctly */
+	li		t1, 0xBE00000C
+	lw		t2, 0(t1)
+	or		t2, t2, 0x00000300
+	sw		t2, 0(t1)
+
+	/* Check switch setting */
+	li		t1, 0xBE000014
+	lw		t2, 0(t1)
+	and		t2, t2, 0x00000100
+	bne		t2, zero, big_endian
+	nop
+
+little_endian:
+
+	/* Change Au1 core to little endian */
+	li	t0, AU1500_SYS_ADDR
+	li	t1, 1
+	sw	t1, sys_endian(t0)
+	mfc0	t2, CP0_CONFIG
+	mtc0	t2, CP0_CONFIG
+	nop
+	nop
+
+	/* Big Endian is default so nothing to do but fall through */
+
+big_endian:
+
+	/*
+	 * Step 2) Establish Status Register
+	 * (set BEV, clear ERL, clear EXL, clear IE)
+	 */
+	li	t1, 0x00400000
+	mtc0	t1, CP0_STATUS
+
+	/*
+	 * Step 3) Establish CP0 Config0
+	 * (set OD, set K0=3)
+	 */
+	li	t1, 0x00080003
+	mtc0	t1, CP0_CONFIG
+
+	/*
+	 * Step 4) Disable Watchpoint facilities
+	 */
+	li t1, 0x00000000
+	mtc0	t1, CP0_WATCHLO
+	mtc0	t1, CP0_IWATCHLO
+	/*
+	 * Step 5) Disable the performance counters
+	 */
+	mtc0	zero, CP0_PERFORMANCE
+	nop
+
+	/*
+	 * Step 6) Establish EJTAG Debug register
+	 */
+	mtc0	zero, CP0_DEBUG
+	nop
+
+	/*
+	 * Step 7) Establish Cause
+	 * (set IV bit)
+	 */
+	li	t1, 0x00800000
+	mtc0	t1, CP0_CAUSE
+
+	/* Establish Wired (and Random) */
+	mtc0	zero, CP0_WIRED
+	nop
+
+	/* First setup pll:s to make serial work ok */
+	/* We have a 12 MHz crystal */
+	li	t0, SYS_CPUPLL
+	li	t1, 0x21  /* 396 MHz */
+	sw	t1, 0(t0)
+	sync
+	nop
+	nop
+
+	/* wait 1mS for clocks to settle */
+	li	t1, MEM_1MS
+1:	add	t1, -1
+	bne	t1, zero, 1b
+	nop
+	/* Setup AUX PLL */
+	li	t0, SYS_AUXPLL
+	li	t1, 8 /* 96 MHz */
+	sw	t1, 0(t0) /* aux pll */
+	sync
+
+	/*  Static memory controller */
+
+	/* RCE0 8MB AMD29D323 Flash */
+	li	t0, MEM_STCFG0
+	li	t1, 0x00001403
+	sw	t1, 0(t0)
+
+	li	t0, MEM_STTIME0
+	li	t1, 0xFFFFFFDD
+	sw	t1, 0(t0)
+
+	li	t0, MEM_STADDR0
+	li	t1, 0x11F83FE0
+	sw	t1, 0(t0)
+
+	/* RCE1 CPLD Board Logic */
+	li	t0, MEM_STCFG1
+	li	t1, 0x00000083
+	sw	t1, 0(t0)
+
+	li	t0, MEM_STTIME1
+	li	t1, 0x33030A10
+	sw	t1, 0(t0)
+
+	li	t0, MEM_STADDR1
+	li	t1, 0x11803E40
+	sw	t1, 0(t0)
+
+	/* RCE2 CPLD Board Logic */
+	li	t0, MEM_STCFG2
+	li	t1, 0x00000004
+	sw	t1, 0(t0)
+
+	li	t0, MEM_STTIME2
+	li	t1, 0x08061908
+	sw	t1, 0(t0)
+
+	li	t0, MEM_STADDR2
+	li	t1, 0x12A03FC0
+	sw	t1, 0(t0)
+
+	/* RCE3 PCMCIA 250ns */
+	li	t0, MEM_STCFG3
+	li	t1, 0x00000002
+	sw	t1, 0(t0)
+
+	li	t0, MEM_STTIME3
+	li	t1, 0x280E3E07
+	sw	t1, 0(t0)
+
+	li	t0, MEM_STADDR3
+	li	t1, 0x10000000
+	sw	t1, 0(t0)
+
+	sync
+
+	/* Set peripherals to a known state */
+	li	t0, IC0_CFG0CLR
+	li	t1, 0xFFFFFFFF
+	sw	t1, 0(t0)
+
+	li	t0, IC0_CFG0CLR
+	sw	t1, 0(t0)
+
+	li	t0, IC0_CFG1CLR
+	sw	t1, 0(t0)
+
+	li	t0, IC0_CFG2CLR
+	sw	t1, 0(t0)
+
+	li	t0, IC0_SRCSET
+	sw	t1, 0(t0)
+
+	li	t0, IC0_ASSIGNSET
+	sw	t1, 0(t0)
+
+	li	t0, IC0_WAKECLR
+	sw	t1, 0(t0)
+
+	li	t0, IC0_RISINGCLR
+	sw	t1, 0(t0)
+
+	li	t0, IC0_FALLINGCLR
+	sw	t1, 0(t0)
+
+	li	t0, IC0_TESTBIT
+	li	t1, 0x00000000
+	sw	t1, 0(t0)
+	sync
+
+	li	t0, IC1_CFG0CLR
+	li	t1, 0xFFFFFFFF
+	sw	t1, 0(t0)
+
+	li	t0, IC1_CFG0CLR
+	sw	t1, 0(t0)
+
+	li	t0, IC1_CFG1CLR
+	sw	t1, 0(t0)
+
+	li	t0, IC1_CFG2CLR
+	sw	t1, 0(t0)
+
+	li	t0, IC1_SRCSET
+	sw	t1, 0(t0)
+
+	li	t0, IC1_ASSIGNSET
+	sw	t1, 0(t0)
+
+	li	t0, IC1_WAKECLR
+	sw	t1, 0(t0)
+
+	li	t0, IC1_RISINGCLR
+	sw	t1, 0(t0)
+
+	li	t0, IC1_FALLINGCLR
+	sw	t1, 0(t0)
+
+	li	t0, IC1_TESTBIT
+	li	t1, 0x00000000
+	sw	t1, 0(t0)
+	sync
+
+	li	t0, SYS_FREQCTRL0
+	li	t1, 0x00000000
+	sw	t1, 0(t0)
+
+	li	t0, SYS_FREQCTRL1
+	li	t1, 0x00000000
+	sw	t1, 0(t0)
+
+	li	t0, SYS_CLKSRC
+	li	t1, 0x00000000
+	sw	t1, 0(t0)
+
+	li	t0, SYS_PININPUTEN
+	li	t1, 0x00000000
+	sw	t1, 0(t0)
+	sync
+
+	li	t0, 0xB1100100
+	li	t1, 0x00000000
+	sw	t1, 0(t0)
+
+	li	t0, 0xB1400100
+	li	t1, 0x00000000
+	sw	t1, 0(t0)
+
+
+	li	t0, SYS_WAKEMSK
+	li	t1, 0x00000000
+	sw	t1, 0(t0)
+
+	li	t0, SYS_WAKESRC
+	li	t1, 0x00000000
+	sw	t1, 0(t0)
+
+	/* wait 1mS before setup */
+	li	t1, MEM_1MS
+1:	add	t1, -1
+	bne	t1, zero, 1b
+	nop
+
+	/*
+	 * Skip memory setup if we are running from memory
+	 */
+	li		t0, 0x90000000
+	sub		t0, ra, t0
+	bltz		t0, skip_memsetup
+	nop
+
+	/*
+	 * SDCS0 - Not used, for SMROM
+	 * SDCS1 - 32MB Micron 48LCBM16A2
+	 * SDCS2 - 32MB Micron 48LCBM16A2
+	 */
+	li	t0, MEM_SDMODE0
+	li	t1, 0x00000000
+	sw	t1, 0(t0)
+
+	li	t0, MEM_SDMODE1
+	li	t1, 0x00552229
+	sw	t1, 0(t0)
+
+	li	t0, MEM_SDMODE2
+	li	t1, 0x00552229
+	sw	t1, 0(t0)
+
+	li	t0, MEM_SDADDR0
+	li	t1, 0x00000000
+	sw	t1, 0(t0)
+
+	li	t0, MEM_SDADDR1
+	li	t1, 0x001003F8
+	sw	t1, 0(t0)
+
+	li	t0, MEM_SDADDR2
+	li	t1, 0x001023F8
+	sw	t1, 0(t0)
+
+	sync
+
+	li	t0, MEM_SDREFCFG
+	li	t1, 0x74000c30 /* Disable */
+	sw	t1, 0(t0)
+	sync
+
+	li	t0, MEM_SDPRECMD
+	sw	zero, 0(t0)
+	sync
+
+	li	t0, MEM_SDAUTOREF
+	sw	zero, 0(t0)
+	sync
+	sw	zero, 0(t0)
+	sync
+
+	li	t0, MEM_SDREFCFG
+	li	t1, 0x76000c30 /* Enable */
+	sw	t1, 0(t0)
+	sync
+
+	li	t0, MEM_SDWRMD0
+	li	t1, 0x00000023
+	sw	t1, 0(t0)
+	sync
+
+	li	t0, MEM_SDWRMD1
+	li	t1, 0x00000023
+	sw	t1, 0(t0)
+	sync
+
+	li	t0, MEM_SDWRMD2
+	li	t1, 0x00000023
+	sw	t1, 0(t0)
+	sync
+
+	/* wait 1mS after setup */
+	li	t1, MEM_1MS
+1:	add	t1, -1
+	bne	t1, zero, 1b
+	nop
+
+skip_memsetup:
+
+	li	t0, SYS_PINFUNC
+	li	t1, 0/*0x00008080*/
+	sw	t1, 0(t0)
+
+	/*
+	li	t0, SYS_TRIOUTCLR
+	li	t1, 0x00001FFF
+	sw	t1, 0(t0)
+
+	li	t0, SYS_OUTPUTCLR
+	li	t1, 0x00008000
+	sw	t1, 0(t0)
+	*/
+	sync
+
+	j	ra
+	nop