[U-Boot] [RFC 1/5] MX31: Add NAND SPL for i.MX31.
Magnus Lilja
lilja.magnus at gmail.com
Fri Apr 3 23:28:00 CEST 2009
This patch adds the NAND SPL framework needed to boot i.MX31 boards
from NAND.
The patch is based on the work by Maxim Artamonov
<scn1874 at yandex.ru > (which was signed-off-by him).
--
Changes since V3 (original author's latest post):
* Updated to apply on the main U-boot tree as of 2009-04-02
* Split the patch into two parts, one with the NAND SPL framework
and one which activates the NAND boot for the phycore board.
* Coding style corrections.
---
cpu/arm1136/start.S | 36 +++++--
include/asm-arm/arch-mx31/mx31-regs.h | 96 +++++++++++++++
nand_spl/nand_boot_mx31.c | 204 +++++++++++++++++++++++++++++++++
3 files changed, 327 insertions(+), 9 deletions(-)
create mode 100644 nand_spl/nand_boot_mx31.c
diff --git a/cpu/arm1136/start.S b/cpu/arm1136/start.S
index e622338..e87bf99 100644
--- a/cpu/arm1136/start.S
+++ b/cpu/arm1136/start.S
@@ -1,6 +1,9 @@
/*
* armboot - Startup Code for OMP2420/ARM1136 CPU-core
*
+ *
+ * Copyright (c) 2008 Maxim Artamonov, <scn1874 at yandex.ru>
+ *
* Copyright (c) 2004 Texas Instruments <r-woodruff2 at ti.com>
*
* Copyright (c) 2001 Marius Gröger <mag at sysgo.de>
@@ -32,6 +35,15 @@
#include <version.h>
.globl _start
_start: b reset
+#ifdef CONFIG_NAND_SPL
+ nop
+ nop
+ nop
+ nop
+ nop
+ nop
+ nop
+#else
#ifdef CONFIG_ONENAND_IPL
ldr pc, _hang
ldr pc, _hang
@@ -68,6 +80,7 @@ _irq: .word irq
_fiq: .word fiq
_pad: .word 0x12345678 /* now 16*4=64 */
#endif /* CONFIG_ONENAND_IPL */
+#endif /* CONFIG_NAND_SPL */
.global _end_vect
_end_vect:
@@ -156,9 +169,9 @@ relocate: /* relocate U-Boot to RAM */
adr r0, _start /* r0 <- current position of code */
ldr r1, _TEXT_BASE /* test if we run from flash or RAM */
cmp r0, r1 /* don't reloc during debug */
-#ifndef CONFIG_ONENAND_IPL
+#if !defined(CONFIG_ONENAND_IPL) && !defined(CONFIG_NAND_SPL)
beq stack_setup
-#endif /* CONFIG_ONENAND_IPL */
+#endif /* !CONFIG_ONENAND_IPL && !CONFIG_NAND_SPL*/
ldr r2, _armboot_start
ldr r3, _bss_start
@@ -175,7 +188,7 @@ copy_loop:
/* Set up the stack */
stack_setup:
ldr r0, _TEXT_BASE /* upper 128 KiB: relocated uboot */
-#ifdef CONFIG_ONENAND_IPL
+#if defined(CONFIG_ONENAND_IPL) || defined (CONFIG_NAND_SPL)
sub sp, r0, #128 /* leave 32 words for abort-stack */
#else
sub r0, r0, #CONFIG_SYS_MALLOC_LEN /* malloc area */
@@ -184,14 +197,14 @@ stack_setup:
sub r0, r0, #(CONFIG_STACKSIZE_IRQ+CONFIG_STACKSIZE_FIQ)
#endif
sub sp, r0, #12 /* leave 3 words for abort-stack */
-#endif /* CONFIG_ONENAND_IPL */
+#endif /* CONFIG_ONENAND_IPL || CONFIG_NAND_SPL*/
clear_bss:
ldr r0, _bss_start /* find start of bss segment */
ldr r1, _bss_end /* stop here */
mov r2, #0x00000000 /* clear */
-#ifndef CONFIG_ONENAND_IPL
+#if !defined(CONFIG_ONENAND_IPL) && !defined(CONFIG_NAND_SPL)
clbss_l:str r2, [r0] /* clear loop... */
add r0, r0, #4
cmp r0, r1
@@ -200,12 +213,15 @@ clbss_l:str r2, [r0] /* clear loop... */
ldr pc, _start_armboot
+#ifdef CONFIG_NAND_SPL
+_start_armboot: .word nand_boot
+#else
#ifdef CONFIG_ONENAND_IPL
_start_armboot: .word start_oneboot
#else
_start_armboot: .word start_armboot
-#endif
-
+#endif /* CONFIG_ONENAND_IPL */
+#endif /* CONFIG_NAND_SPL */
/*
*************************************************************************
@@ -244,7 +260,7 @@ cpu_init_crit:
mov lr, ip /* restore link */
mov pc, lr /* back to my caller */
-#ifndef CONFIG_ONENAND_IPL
+#if !defined(CONFIG_ONENAND_IPL) && !defined(CONFIG_NAND_SPL)
/*
*************************************************************************
*
@@ -357,11 +373,12 @@ cpu_init_crit:
.macro get_fiq_stack @ setup FIQ stack
ldr sp, FIQ_STACK_START
.endm
-#endif /* CONFIG_ONENAND_IPL */
+#endif /* !CONFIG_ONENAND_IPL && !CONFIG_NAND_SPL*/
/*
* exception handlers
*/
+#ifndef CONFIG_NAND_SPL
#ifdef CONFIG_ONENAND_IPL
.align 5
do_hang:
@@ -436,3 +453,4 @@ arm1136_cache_flush:
mcr p15, 0, r1, c7, c5, 0 @ invalidate I cache
mov pc, lr @ back to caller
#endif /* CONFIG_ONENAND_IPL */
+#endif /* !CONFIG_NAND_SPL*/
diff --git a/include/asm-arm/arch-mx31/mx31-regs.h b/include/asm-arm/arch-mx31/mx31-regs.h
index a8a05c8..45f2ae3 100644
--- a/include/asm-arm/arch-mx31/mx31-regs.h
+++ b/include/asm-arm/arch-mx31/mx31-regs.h
@@ -194,4 +194,100 @@
#define CS5_BASE 0xB6000000
#define PCMCIA_MEM_BASE 0xC0000000
+/*
+ * NAND controller
+ */
+#define NFC_BASE_ADDR 0xB8000000
+
+/*
+ * Addresses for NFC registers
+ */
+#define NFC_BUF_SIZE (*((volatile u16 *)(NFC_BASE_ADDR + 0xE00)))
+#define NFC_BUF_ADDR (*((volatile u16 *)(NFC_BASE_ADDR + 0xE04)))
+#define NFC_FLASH_ADDR (*((volatile u16 *)(NFC_BASE_ADDR + 0xE06)))
+#define NFC_FLASH_CMD (*((volatile u16 *)(NFC_BASE_ADDR + 0xE08)))
+#define NFC_CONFIG (*((volatile u16 *)(NFC_BASE_ADDR + 0xE0A)))
+#define NFC_ECC_STATUS_RESULT (*((volatile u16 *)(NFC_BASE_ADDR + 0xE0C)))
+#define NFC_RSLTMAIN_AREA (*((volatile u16 *)(NFC_BASE_ADDR + 0xE0E)))
+#define NFC_RSLTSPARE_AREA (*((volatile u16 *)(NFC_BASE_ADDR + 0xE10)))
+#define NFC_WRPROT (*((volatile u16 *)(NFC_BASE_ADDR + 0xE12)))
+#define NFC_UNLOCKSTART_BLKADDR (*((volatile u16 *)(NFC_BASE_ADDR + 0xE14)))
+#define NFC_UNLOCKEND_BLKADDR (*((volatile u16 *)(NFC_BASE_ADDR + 0xE16)))
+#define NFC_NF_WRPRST (*((volatile u16 *)(NFC_BASE_ADDR + 0xE18)))
+#define NFC_CONFIG1 (*((volatile u16 *)(NFC_BASE_ADDR + 0xE1A)))
+#define NFC_CONFIG2 (*((volatile u16 *)(NFC_BASE_ADDR + 0xE1C)))
+
+/*
+ * Addresses for NFC RAM BUFFER Main area 0
+ */
+#define MAIN_AREA0 (volatile u16 *)(NFC_BASE_ADDR + 0x000)
+#define MAIN_AREA1 (volatile u16 *)(NFC_BASE_ADDR + 0x200)
+#define MAIN_AREA2 (volatile u16 *)(NFC_BASE_ADDR + 0x400)
+#define MAIN_AREA3 (volatile u16 *)(NFC_BASE_ADDR + 0x600)
+
+/*
+ * Addresses for NFC SPARE BUFFER Spare area 0
+ */
+#define SPARE_AREA0 (volatile u16 *)(NFC_BASE_ADDR + 0x800)
+#define SPARE_AREA1 (volatile u16 *)(NFC_BASE_ADDR + 0x810)
+#define SPARE_AREA2 (volatile u16 *)(NFC_BASE_ADDR + 0x820)
+#define SPARE_AREA3 (volatile u16 *)(NFC_BASE_ADDR + 0x830)
+
+/*
+ * Set INT to 0, FCMD to 1, rest to 0 in NFC_CONFIG2 Register for Command
+ * operation
+ */
+#define NFC_CMD 0x1
+
+/*
+ * Set INT to 0, FADD to 1, rest to 0 in NFC_CONFIG2 Register for Address
+ * operation
+ */
+#define NFC_ADDR 0x2
+
+/*
+ * Set INT to 0, FDI to 1, rest to 0 in NFC_CONFIG2 Register for Input
+ * operation
+ */
+#define NFC_INPUT 0x4
+
+/*
+ * Set INT to 0, FDO to 001, rest to 0 in NFC_CONFIG2 Register for Data
+ * Output operation
+ */
+#define NFC_OUTPUT 0x8
+
+/*
+ * Set INT to 0, FD0 to 010, rest to 0 in NFC_CONFIG2 Register for Read ID
+ * operation
+ */
+#define NFC_ID 0x10
+
+/*
+ * Set INT to 0, FDO to 100, rest to 0 in NFC_CONFIG2 Register for Read
+ * Status operation
+ */
+#define NFC_STATUS 0x20
+
+/*
+ * Set INT to 1, rest to 0 in NFC_CONFIG2 Register for Read Status
+ * operation
+ */
+#define NFC_INT 0x8000
+
+#define NFC_SP_EN (1 << 2)
+#define NFC_ECC_EN (1 << 3)
+#define NFC_INT_MSK (1 << 4)
+#define NFC_BIG (1 << 5)
+#define NFC_RST (1 << 6)
+#define NFC_CE (1 << 7)
+#define NFC_ONE_CYCLE (1 << 8)
+
+/*
+ * NFMS bit in RCSR register for pagesize of nandflash
+ */
+#define NFMS (*((volatile u32 *)CCM_RCSR))
+#define NFMS_BIT 30
+
#endif /* __ASM_ARCH_MX31_REGS_H */
+
diff --git a/nand_spl/nand_boot_mx31.c b/nand_spl/nand_boot_mx31.c
new file mode 100644
index 0000000..a772756
--- /dev/null
+++ b/nand_spl/nand_boot_mx31.c
@@ -0,0 +1,204 @@
+/*
+ * (C) Copyright 2008
+ * Maxim Artamonov, <scn1874 at yandex.ru>
+ *
+ * (C) Copyright 2006-2008
+ * Stefan Roese, DENX Software Engineering, sr at denx.de.
+ *
+ * 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 <common.h>
+#include <nand.h>
+#include <asm-arm/arch/mx31-regs.h>
+
+static void mx31_wait_ready(void)
+{
+ while (1) {
+ if (NFC_CONFIG2 & NFC_INT) {
+ /* Reset interrupt flag */
+ NFC_CONFIG2 = NFC_CONFIG2 & (~NFC_INT);
+ break;
+ }
+ }
+}
+
+static void mx31_nand_init(void)
+{
+ /* unlocking RAM Buff */
+ NFC_CONFIG = 0x2;
+
+ /* hardware ECC checking and correct */
+ NFC_CONFIG1 = NFC_ECC_EN;
+}
+
+static void mx31_nand_command(unsigned short command)
+{
+ NFC_FLASH_CMD = command;
+ NFC_CONFIG2 = NFC_CMD;
+ mx31_wait_ready();
+}
+
+static void mx31_nand_page_address(unsigned int page_address)
+{
+ unsigned int page_count;
+
+ NFC_FLASH_ADDR = 0x00;
+ NFC_CONFIG2 = NFC_ADDR;
+ mx31_wait_ready();
+
+ /* code only for 2kb flash */
+ if (CFG_NAND_PAGE_SIZE == 0x800) {
+ NFC_FLASH_ADDR = 0x00;
+ NFC_CONFIG2 = NFC_ADDR;
+ mx31_wait_ready();
+ }
+
+ page_count = CFG_NAND_CHIP_SIZE / CFG_NAND_PAGE_SIZE;
+
+ if (page_address <= page_count){
+ page_count--; /* transform 0x01000000 to 0x00ffffff */
+ do {
+ NFC_FLASH_ADDR = (unsigned short)(page_address & 0xff);
+ NFC_CONFIG2 = NFC_ADDR;
+ mx31_wait_ready();
+ page_address = page_address >> 8;
+ page_count = page_count >> 8;
+ } while (page_count);
+ }
+}
+
+static void mx31_nand_data_output(void)
+{
+ int i;
+
+ /*
+ * The NAND controller requires four output commands for
+ * large page devices.
+ */
+ for (i = 0; i < (CFG_NAND_PAGE_SIZE / 512); i++) {
+ NFC_CONFIG1 = NFC_ECC_EN;
+ NFC_BUF_ADDR = i; /* read in i:th buffer */
+ NFC_CONFIG2 = NFC_OUTPUT;
+ mx31_wait_ready();
+ }
+}
+
+static int mx31_nand_check_ecc(void)
+{
+ unsigned short ecc_status_register;
+
+ ecc_status_register = NFC_ECC_STATUS_RESULT;
+
+ if (ecc_status_register != 0)
+ return 1; /* error */
+ return 0;
+}
+
+static int mx31_read_page(unsigned int page_address, unsigned char *buf)
+{
+ int i;
+ volatile u32 *p1;
+ volatile u32 *p2;
+ u32 a;
+
+ mx31_nand_init();
+ NFC_BUF_ADDR = 0; /* read in first 0 buffer */
+ mx31_nand_command(NAND_CMD_READ0);
+ mx31_nand_page_address(page_address);
+
+ if (CFG_NAND_CHIP_SIZE >= 0x08000000)
+ mx31_nand_command(NAND_CMD_READSTART);
+
+ mx31_nand_data_output(); /* fill the main buffer 0 */
+
+ if (mx31_nand_check_ecc()) {
+ while (1) {
+ /* hang-loop in case of ecc-error */
+ }
+ }
+
+ p1 = (u32 *)MAIN_AREA0;
+ p2 = (u32 *)buf;
+
+ /* main copy loop from NAND-buffer to SDRAM memory */
+ for (i = 0; i < (CFG_NAND_PAGE_SIZE / 4); i++) {
+ *p2 = *p1;
+ p1++;
+ p2++;
+ }
+
+ p1 = (u32 *)SPARE_AREA0;
+
+ /* it is hardware specific code for 8-bit 512 B NAND-flash spare area */
+ p1++;
+ a = *p1;
+ a = (a & 0x0000ff00) >> 8;
+
+ if (a != 0xff) /* bad block marker verify */
+ return 1; /* potential bad block */
+
+ return 0;
+}
+
+static int nand_load(unsigned int from, unsigned int size, unsigned char *buf)
+{
+ int i, bb;
+
+ mx31_nand_init();
+
+ /* convert from to page number */
+ from = from / CFG_NAND_PAGE_SIZE;
+
+ i = 0;
+
+ while (i < (size/CFG_NAND_PAGE_SIZE)) {
+ if ((from * CFG_NAND_PAGE_SIZE) >= CFG_NAND_CHIP_SIZE)
+ return 2; /* memory segment violation */
+
+ bb = mx31_read_page(from, buf);
+
+ /* checking first page of each block */
+ /* if this page has bb marker, then skip whole block */
+ if ((!(from % CFG_NAND_PAGES_PER_BLOCK)) && bb) {
+ from = from + CFG_NAND_PAGES_PER_BLOCK;
+ }
+ else {
+ i++;
+ from++;
+ buf = buf + CFG_NAND_PAGE_SIZE;
+ }
+ }
+
+ return 0;
+}
+
+/*
+ * The main entry for NAND booting. It's necessary that SDRAM is already
+ * configured and available since this code loads the main U-Boot image
+ * from NAND into SDRAM and starts it from there.
+ */
+void nand_boot(void)
+{
+ __attribute__((noreturn)) void (*uboot)(void);
+
+ /* CFG_NAND_U_BOOT_OFFS and CFG_NAND_U_BOOT_SIZE must */
+ /* be aligned to full pages */
+ nand_load(CFG_NAND_U_BOOT_OFFS, CFG_NAND_U_BOOT_SIZE,
+ (uchar *)CFG_NAND_U_BOOT_DST);
+
+ uboot = (void *)CFG_NAND_U_BOOT_START;
+ uboot();
+}
--
1.5.6
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