qong: support for Dave/DENX QongEVB-LITE board

This patch adds support for Dave/DENX QongEVB-LITE i.MX31-based board.

Signed-off-by: Ilya Yanok <yanok@emcraft.com>
Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>

1 files changed, 172 insertions, 0 deletions

diff --git a/board/davedenx/qong/lowlevel_init.S b/board/davedenx/qong/lowlevel_init.S
new file mode 100644
index 0000000000..198dd76b8a
--- /dev/null
+++ b/board/davedenx/qong/lowlevel_init.S
@@ -0,0 +1,172 @@
+/*
+ * Copyright (C) 2009, Emcraft Systems, Ilya Yanok <yanok@emcraft.com>
+ *
+ * Based on board/freescale/mx31ads/lowlevel_init.S
+ * by Guennadi Liakhovetski.
+ *
+ * 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 program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ */
+
+#include <asm/arch/mx31-regs.h>
+
+.macro REG reg, val
+	ldr r2, =\reg
+	ldr r3, =\val
+	str r3, [r2]
+.endm
+
+.macro REG8 reg, val
+	ldr r2, =\reg
+	ldr r3, =\val
+	strb r3, [r2]
+.endm
+
+.macro DELAY loops
+	ldr r2, =\loops
+1:
+	subs	r2, r2, #1
+	nop
+	bcs 1b
+.endm
+
+/* RedBoot: To support 133MHz DDR */
+.macro init_drive_strength
+	/*
+	 * Disable maximum drive strength SDRAM/DDR lines by clearing DSE1 bits
+	 * in SW_PAD_CTL registers
+	 */
+
+	/* SDCLK */
+	ldr r1, =IOMUXC_SW_PAD_CTL(0x2b)
+	ldr r0, [r1, #0x6C]
+	bic r0, r0, #(1 << 12)
+	str r0, [r1, #0x6C]
+
+	/* CAS */
+	ldr r0, [r1, #0x70]
+	bic r0, r0, #(1 << 22)
+	str r0, [r1, #0x70]
+
+	/* RAS */
+	ldr r0, [r1, #0x74]
+	bic r0, r0, #(1 << 2)
+	str r0, [r1, #0x74]
+
+	/* CS2 (CSD0) */
+	ldr r0, [r1, #0x7C]
+	bic r0, r0, #(1 << 22)
+	str r0, [r1, #0x7C]
+
+	/* DQM3 */
+	ldr r0, [r1, #0x84]
+	bic r0, r0, #(1 << 22)
+	str r0, [r1, #0x84]
+
+	/* DQM2, DQM1, DQM0, SD31-SD0, A25-A0, MA10 (0x288..0x2DC) */
+	ldr r2, =22	/* (0x2E0 - 0x288) / 4 = 22 */
+pad_loop:
+	ldr r0, [r1, #0x88]
+	bic r0, r0, #(1 << 22)
+	bic r0, r0, #(1 << 12)
+	bic r0, r0, #(1 << 2)
+	str r0, [r1, #0x88]
+	add r1, r1, #4
+	subs r2, r2, #0x1
+	bne pad_loop
+.endm /* init_drive_strength */
+
+.globl lowlevel_init
+lowlevel_init:
+
+	init_drive_strength
+
+	/* Image Processing Unit: */
+	/* Too early to switch display on? */
+	/* Switch on Display Interface */
+	REG	IPU_CONF, IPU_CONF_DI_EN
+	/* Clock Control Module: */
+	REG	CCM_CCMR, 0x074B0BF5		/* Use CKIH, MCU PLL off */
+
+	DELAY 0x40000
+
+	REG	CCM_CCMR, 0x074B0BF5 | CCMR_MPE			/* MCU PLL on */
+	/* Switch to MCU PLL */
+	REG	CCM_CCMR, (0x074B0BF5 | CCMR_MPE) & ~CCMR_MDS
+
+	/* 399-133-66.5 */
+	ldr	r0, =CCM_BASE
+	ldr	r1, =0xFF871650
+	/* PDR0 */
+	str	r1, [r0, #0x4]
+	ldr	r1, MPCTL_PARAM_399
+	/* MPCTL */
+	str	r1, [r0, #0x10]
+
+	/* Set UPLL=240MHz, USB=60MHz */
+	ldr	r1, =0x49FCFE7F
+	/* PDR1 */
+	str	r1, [r0, #0x8]
+	ldr	r1, UPCTL_PARAM_240
+	/* UPCTL */
+	str	r1, [r0, #0x14]
+	/* default CLKO to 1/8 of the ARM core */
+	mov	r1, #0x00000208
+	/* COSR */
+	str	r1, [r0, #0x1c]
+
+	/* Default: 1, 4, 12, 1 */
+	REG	CCM_SPCTL, PLL_PD(1) | PLL_MFD(4) | PLL_MFI(12) | PLL_MFN(1)
+
+	/* B8xxxxxx - NAND, 8xxxxxxx - CSD0 RAM */
+	REG	0xB8001010, 0x00000004
+	REG	0xB8001004, ((3 << 21) | /* tXP */	\
+			     (0 << 20) | /* tWTR */	\
+			     (2 << 18) | /* tRP */	\
+			     (1 << 16) | /* tMRD */	\
+			     (0 << 15) | /* tWR */	\
+			     (5 << 12) | /* tRAS */	\
+			     (1 << 10) | /* tRRD */	\
+			     (3 << 8)  | /* tCAS */	\
+			     (2 << 4)  | /* tRCD */	\
+			     (7 << 0)    /* tRC */ )
+	REG	0xB8001000, 0x92100000
+	REG	0x80000f00, 0x12344321
+	REG	0xB8001000, 0xa2100000
+	REG	0x80000000, 0x12344321
+	REG	0x80000000, 0x12344321
+	REG	0xB8001000, 0xb2100000
+	REG8	0x80000033, 0xda
+	REG8	0x81000000, 0xff
+	REG	0xB8001000, ((1 << 31) |				\
+			     (0 << 28) |				\
+			     (0 << 27) |				\
+			     (3 << 24) | /* 14 rows */			\
+			     (2 << 20) | /* 10 cols */			\
+			     (2 << 16) |				\
+			     (4 << 13) | /* 3.91us (64ms/16384) */	\
+			     (0 << 10) |				\
+			     (0 << 8)  |				\
+			     (1 << 7)  |				\
+			     (0 << 0))
+	REG	0x80000000, 0xDEADBEEF
+	REG	0xB8001010, 0x0000000c
+
+	mov	pc, lr
+
+MPCTL_PARAM_399:
+	.word (((1 - 1) << 26) + ((52 - 1) << 16) + (7 << 10) + (35 << 0))
+UPCTL_PARAM_240:
+	.word (((2 - 1) << 26) + ((13 - 1) << 16) + (9 << 10) + (3  << 0))