forked from Minki/linux
cb881f5e15
bcm47xx only uses the CFE code for early print to a console, but that is also possible with a early print serial 8250 driver. The CFE api init causes hangs somewhere in prom_init_cfe() on some devices like the Buffalo WHR-HP-G54 and the Asus WL-520GU. This was reported in https://dev.openwrt.org/ticket/4061 and https://forum.openwrt.org/viewtopic.php?id=17063 This will remove all the CFE handling code from bcm47xx. Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de> Tested-by: Aaro Koskinen <aaro.koskinen@iki.fi> Signed-off-by: John Crispin <blogic@openwrt.org> Patchwork: http://patchwork.linux-mips.org/patch/5888/
105 lines
3.5 KiB
C
105 lines
3.5 KiB
C
/*
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* Copyright (C) 2004 Florian Schirmer <jolt@tuxbox.org>
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* Copyright (C) 2007 Aurelien Jarno <aurelien@aurel32.net>
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* Copyright (C) 2010-2012 Hauke Mehrtens <hauke@hauke-m.de>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN
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* NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
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* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
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* ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include <linux/init.h>
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#include <linux/types.h>
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#include <linux/kernel.h>
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#include <linux/spinlock.h>
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#include <linux/smp.h>
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#include <asm/bootinfo.h>
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#include <bcm47xx.h>
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#include <bcm47xx_board.h>
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static char bcm47xx_system_type[20] = "Broadcom BCM47XX";
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const char *get_system_type(void)
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{
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return bcm47xx_system_type;
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}
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__init void bcm47xx_set_system_type(u16 chip_id)
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{
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snprintf(bcm47xx_system_type, sizeof(bcm47xx_system_type),
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(chip_id > 0x9999) ? "Broadcom BCM%d" :
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"Broadcom BCM%04X",
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chip_id);
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}
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static __init void prom_init_mem(void)
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{
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unsigned long mem;
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unsigned long max;
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unsigned long off;
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struct cpuinfo_mips *c = ¤t_cpu_data;
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/* Figure out memory size by finding aliases.
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*
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* We should theoretically use the mapping from CFE using cfe_enummem().
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* However as the BCM47XX is mostly used on low-memory systems, we
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* want to reuse the memory used by CFE (around 4MB). That means cfe_*
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* functions stop to work at some point during the boot, we should only
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* call them at the beginning of the boot.
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*
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* BCM47XX uses 128MB for addressing the ram, if the system contains
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* less that that amount of ram it remaps the ram more often into the
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* available space.
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* Accessing memory after 128MB will cause an exception.
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* max contains the biggest possible address supported by the platform.
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* If the method wants to try something above we assume 128MB ram.
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*/
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off = (unsigned long)prom_init;
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max = off | ((128 << 20) - 1);
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for (mem = (1 << 20); mem < (128 << 20); mem += (1 << 20)) {
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if ((off + mem) > max) {
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mem = (128 << 20);
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printk(KERN_DEBUG "assume 128MB RAM\n");
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break;
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}
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if (!memcmp(prom_init, prom_init + mem, 32))
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break;
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}
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/* Ignoring the last page when ddr size is 128M. Cached
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* accesses to last page is causing the processor to prefetch
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* using address above 128M stepping out of the ddr address
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* space.
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*/
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if (c->cputype == CPU_74K && (mem == (128 << 20)))
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mem -= 0x1000;
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add_memory_region(0, mem, BOOT_MEM_RAM);
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}
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void __init prom_init(void)
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{
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prom_init_mem();
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}
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void __init prom_free_prom_memory(void)
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{
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}
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