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author | angelo@sysam.it <angelo@sysam.it> | 2015-02-12 00:39:40 (GMT) |
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committer | Tom Rini <trini@konsulko.com> | 2015-03-06 01:13:21 (GMT) |
commit | 06fd66a4aa8f0bdb0e78072593728fa31be8dadf (patch) | |
tree | be219ed21931578e8ad556fa60158a9c0324e6b6 /board/sysam/amcore/amcore.c | |
parent | a2bc4321e49fa90933029596dd5fa322aad99de4 (diff) | |
download | u-boot-06fd66a4aa8f0bdb0e78072593728fa31be8dadf.tar.xz |
m68k: add amcore board support
Add Sysam Amcore m68k-based board support.
Signed-off-by: Angelo Dureghello <angelo@sysam.it>
Diffstat (limited to 'board/sysam/amcore/amcore.c')
-rw-r--r-- | board/sysam/amcore/amcore.c | 101 |
1 files changed, 101 insertions, 0 deletions
diff --git a/board/sysam/amcore/amcore.c b/board/sysam/amcore/amcore.c new file mode 100644 index 0000000..42b7c23 --- /dev/null +++ b/board/sysam/amcore/amcore.c @@ -0,0 +1,101 @@ +/* + * Board functions for Sysam AMCORE (MCF5307 based) board + * + * (C) Copyright 2015 Angelo Dureghello <angelo@sysam.it> + * + * SPDX-License-Identifier: GPL-2.0+ + * + * This file copies memory testdram() from sandburst/common/sb_common.c + */ + +#include <common.h> +#include <asm/immap.h> +#include <asm/io.h> + +void init_lcd(void) +{ + /* setup for possible K0108 lcd connected on the parallel port */ + sim_t *sim = (sim_t *)(MMAP_SIM); + + out_be16(&sim->par, 0x300); + + gpio_t *gpio = (gpio_t *)(MMAP_GPIO); + + out_be16(&gpio->paddr, 0xfcff); + out_be16(&gpio->padat, 0x0c00); +} + +int checkboard(void) +{ + puts("Board: "); + puts("AMCORE v.001(alpha)\n"); + + init_lcd(); + + return 0; +} + +/* + * in initdram we are here executing from flash + * case 1: + * is with no ACR/flash cache enabled + * nop = 40ns (scope measured) + */ +void fudelay(int usec) +{ + while (usec--) + asm volatile ("nop"); +} + +phys_size_t initdram(int board_type) +{ + u32 dramsize, RC; + + sdramctrl_t *dc = (sdramctrl_t *)(MMAP_DRAMC); + + /* + * SDRAM MT48LC4M32B2 details + * Memory block 0: 16 MB of SDRAM at address $00000000 + * Port size: 32-bit port + * + * Memory block 0 wired as follows: + * CPU : A15 A14 A13 A12 A11 A10 A9 A17 A18 A19 A20 A21 A22 A23 + * SDRAM : A0 A1 A2 A3 A4 A5 A6 A7 A8 A9 A10 A11 BA0 BA1 + * + * Ensure that there is a delay of at least 100 microseconds from + * processor reset to the following code so that the SDRAM is ready + * for commands. + */ + fudelay(100); + + /* + * DCR + * set proper RC as per specification + */ + RC = (CONFIG_SYS_CPU_CLK / 1000000) >> 1; + RC = (RC * 15) >> 4; + + /* 0x8000 is the faster option */ + out_be16(&dc->dcr, 0x8200 | RC); + + /* + * DACR0, page mode continuous, CMD on A20 0x0300 + */ + out_be32(&dc->dacr0, 0x00003304); + + dramsize = ((CONFIG_SYS_SDRAM_SIZE)-1) & 0xfffc0000; + out_be32(&dc->dmr0, dramsize|1); + + /* issue a PRECHARGE ALL */ + out_be32(&dc->dacr0, 0x0000330c); + out_be32((u32 *)0x00000004, 0xbeaddeed); + /* issue AUTOREFRESH */ + out_be32(&dc->dacr0, 0x0000b304); + /* let refresh occour */ + fudelay(1); + + out_be32(&dc->dacr0, 0x0000b344); + out_be32((u32 *)0x00000c00, 0xbeaddeed); + + return get_ram_size(CONFIG_SYS_SDRAM_BASE, CONFIG_SYS_SDRAM_SIZE); +} |