This reconfigures the EBI (External Bus Interface) on the integrator so that chip select 1, handling the flash memory, is set to writeable. Without this it is not possible for U-Boot to access flash memory and it crashes on startup since CFI won't work properly.

Since this is the first time we use the EBI, we create a header file for its registers.

Signed-off-by: Linus Walleij linus.walleij@linaro.org --- ChangeLog v1->v2: - Moved the arm-ebi.h file from the global include/ dir to the board/armltd/integrator/ dir since it's only needed by the Integrator. ChangeLog v2->v3: - Rebased to U-Boot ARM HEAD at Alberts request, see message 4EA1C8E7.7090105@aribaud.net ChangeLog v3->v4: - Rebased to U-Boot ARM HEAD at Alberts request, see message 4EB84700.1030109@aribaud.net --- board/armltd/integrator/arm-ebi.h | 62 ++++++++++++++++++++++++++++++++++ board/armltd/integrator/integrator.c | 15 ++++++++ 2 files changed, 77 insertions(+), 0 deletions(-) create mode 100644 board/armltd/integrator/arm-ebi.h

diff --git a/board/armltd/integrator/arm-ebi.h b/board/armltd/integrator/arm-ebi.h new file mode 100644 index 0000000..2d85e3f --- /dev/null +++ b/board/armltd/integrator/arm-ebi.h @@ -0,0 +1,62 @@ +/* + * (C) Copyright 2011 + * Linaro + * Linus Walleij linus.walleij@linaro.org + * Register definitions for the External Bus Interface (EBI) + * found in the ARM Integrator AP and CP reference designs + * + * See file CREDITS for list of people who contributed to this + * project. + * + * 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 + */ + +#ifndef __ARM_EBI_H +#define __ARM_EBI_H + +#define EBI_BASE 0x12000000 + +#define EBI_CSR0_REG 0x00 /* CS0 = Boot ROM */ +#define EBI_CSR1_REG 0x04 /* CS1 = Flash */ +#define EBI_CSR2_REG 0x08 /* CS2 = SSRAM */ +#define EBI_CSR3_REG 0x0C /* CS3 = Expansion memory */ +/* + * The four upper bits are the waitstates for each chip select + * 0x00 = 2 cycles, 0x10 = 3 cycles, ... 0xe0 = 16 cycles, 0xf0 = 16 cycles + */ +#define EBI_CSR_WAIT_MASK 0xF0 +/* Whether memory is synchronous or asynchronous */ +#define EBI_CSR_SYNC_MASK 0xF7 +#define EBI_CSR_ASYNC 0x00 +#define EBI_CSR_SYNC 0x08 +/* Whether memory is write enabled or not */ +#define EBI_CSR_WREN_MASK 0xFB +#define EBI_CSR_WREN_DISABLE 0x00 +#define EBI_CSR_WREN_ENABLE 0x04 +/* Memory bit width for each chip select */ +#define EBI_CSR_MEMSIZE_MASK 0xFC +#define EBI_CSR_MEMSIZE_8BIT 0x00 +#define EBI_CSR_MEMSIZE_16BIT 0x01 +#define EBI_CSR_MEMSIZE_32BIT 0x02 + +/* + * The lock register need to be written with 0xa05f before anything in the + * EBI can be changed. + */ +#define EBI_LOCK_REG 0x20 +#define EBI_UNLOCK_MAGIC 0xA05F + +#endif diff --git a/board/armltd/integrator/integrator.c b/board/armltd/integrator/integrator.c index 780218c..dd83ca5 100644 --- a/board/armltd/integrator/integrator.c +++ b/board/armltd/integrator/integrator.c @@ -36,6 +36,7 @@ #include <common.h> #include <netdev.h> #include <asm/io.h> +#include "arm-ebi.h"

DECLARE_GLOBAL_DATA_PTR;

@@ -56,6 +57,8 @@ void show_boot_progress(int progress)

int board_init (void) { + u32 val; + /* arch number of Integrator Board */ #ifdef CONFIG_ARCH_CINTEGRATOR gd->bd->bi_arch_number = MACH_TYPE_CINTEGRATOR; @@ -73,6 +76,18 @@ extern void cm_remap(void); cm_remap(); /* remaps writeable memory to 0x00000000 */ #endif

+ /* + * The system comes up with the flash memory non-writable and + * configuration locked. If we want U-Boot to be used for flash + * access we cannot have the flash memory locked. + */ + writel(EBI_UNLOCK_MAGIC, EBI_BASE + EBI_LOCK_REG); + val = readl(EBI_BASE + EBI_CSR1_REG); + val &= EBI_CSR_WREN_MASK; + val |= EBI_CSR_WREN_ENABLE; + writel(val, EBI_BASE + EBI_CSR1_REG); + writel(0, EBI_BASE + EBI_LOCK_REG); + icache_enable ();

return 0;