179 lines
5.4 KiB
C
179 lines
5.4 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/memblock.h>
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#include <linux/spinlock.h>
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#include <linux/ssb/ssb_driver_chipcommon.h>
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#include <linux/ssb/ssb_regs.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 unsigned long lowmem __initdata;
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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 than that amount of ram it remaps the ram more often into the
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* available space.
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*/
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/* Physical address, without mapping to any kernel segment */
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off = CPHYSADDR((unsigned long)prom_init);
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/* Accessing memory after 128 MiB will cause an exception */
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max = 128 << 20;
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for (mem = 1 << 20; mem < max; mem += 1 << 20) {
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/* Loop condition may be not enough, off may be over 1 MiB */
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if (off + mem >= max) {
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mem = max;
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pr_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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lowmem = mem;
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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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memblock_add(0, mem);
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}
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/*
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* This is the first serial on the chip common core, it is at this position
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* for sb (ssb) and ai (bcma) bus.
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*/
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#define BCM47XX_SERIAL_ADDR (SSB_ENUM_BASE + SSB_CHIPCO_UART0_DATA)
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void __init prom_init(void)
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{
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prom_init_mem();
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setup_8250_early_printk_port(CKSEG1ADDR(BCM47XX_SERIAL_ADDR), 0, 0);
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}
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#if defined(CONFIG_BCM47XX_BCMA) && defined(CONFIG_HIGHMEM)
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#define EXTVBASE 0xc0000000
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#define ENTRYLO(x) ((pte_val(pfn_pte((x) >> _PFN_SHIFT, PAGE_KERNEL_UNCACHED)) >> 6) | 1)
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#include <asm/tlbflush.h>
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/* Stripped version of tlb_init, with the call to build_tlb_refill_handler
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* dropped. Calling it at this stage causes a hang.
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*/
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void early_tlb_init(void)
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{
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write_c0_pagemask(PM_DEFAULT_MASK);
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write_c0_wired(0);
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temp_tlb_entry = current_cpu_data.tlbsize - 1;
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local_flush_tlb_all();
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}
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void __init bcm47xx_prom_highmem_init(void)
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{
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unsigned long off = (unsigned long)prom_init;
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unsigned long extmem = 0;
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bool highmem_region = false;
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if (WARN_ON(bcm47xx_bus_type != BCM47XX_BUS_TYPE_BCMA))
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return;
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if (bcm47xx_bus.bcma.bus.chipinfo.id == BCMA_CHIP_ID_BCM4706)
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highmem_region = true;
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if (lowmem != 128 << 20 || !highmem_region)
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return;
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early_tlb_init();
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/* Add one temporary TLB entry to map SDRAM Region 2.
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* Physical Virtual
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* 0x80000000 0xc0000000 (1st: 256MB)
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* 0x90000000 0xd0000000 (2nd: 256MB)
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*/
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add_temporary_entry(ENTRYLO(0x80000000),
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ENTRYLO(0x80000000 + (256 << 20)),
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EXTVBASE, PM_256M);
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off = EXTVBASE + __pa(off);
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for (extmem = 128 << 20; extmem < 512 << 20; extmem <<= 1) {
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if (!memcmp(prom_init, (void *)(off + extmem), 16))
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break;
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}
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extmem -= lowmem;
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early_tlb_init();
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if (!extmem)
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return;
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pr_warn("Found %lu MiB of extra memory, but highmem is unsupported yet!\n",
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extmem >> 20);
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/* TODO: Register extra memory */
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}
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#endif /* defined(CONFIG_BCM47XX_BCMA) && defined(CONFIG_HIGHMEM) */
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