/* * Copyright (C) 2004 Florian Schirmer <jolt@tuxbox.org> * Copyright (C) 2007 Aurelien Jarno <aurelien@aurel32.net> * Copyright (C) 2010-2012 Hauke Mehrtens <hauke@hauke-m.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 SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN * NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. * * 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., * 675 Mass Ave, Cambridge, MA 02139, USA. */ #include <linux/init.h> #include <linux/types.h> #include <linux/kernel.h> #include <linux/memblock.h> #include <linux/spinlock.h> #include <linux/ssb/ssb_driver_chipcommon.h> #include <linux/ssb/ssb_regs.h> #include <linux/smp.h> #include <asm/bmips.h> #include <asm/bootinfo.h> #include <bcm47xx.h> #include <bcm47xx_board.h> #include "bcm47xx_private.h" static char bcm47xx_system_type[20] = "Broadcom BCM47XX"; const char *get_system_type(void) { return bcm47xx_system_type; } __init void bcm47xx_set_system_type(u16 chip_id) { snprintf(bcm47xx_system_type, sizeof(bcm47xx_system_type), (chip_id > 0x9999) ? "Broadcom BCM%d" : "Broadcom BCM%04X", chip_id); } static unsigned long lowmem __initdata; static __init void prom_init_mem(void) { unsigned long mem; unsigned long max; unsigned long off; struct cpuinfo_mips *c = ¤t_cpu_data; /* Figure out memory size by finding aliases. * * We should theoretically use the mapping from CFE using cfe_enummem(). * However as the BCM47XX is mostly used on low-memory systems, we * want to reuse the memory used by CFE (around 4MB). That means cfe_* * functions stop to work at some point during the boot, we should only * call them at the beginning of the boot. * * BCM47XX uses 128MB for addressing the ram, if the system contains * less than that amount of ram it remaps the ram more often into the * available space. */ /* Physical address, without mapping to any kernel segment */ off = CPHYSADDR((unsigned long)prom_init); /* Accessing memory after 128 MiB will cause an exception */ max = 128 << 20; for (mem = 1 << 20; mem < max; mem += 1 << 20) { /* Loop condition may be not enough, off may be over 1 MiB */ if (off + mem >= max) { mem = max; pr_debug("Assume 128MB RAM\n"); break; } if (!memcmp((void *)prom_init, (void *)prom_init + mem, 32)) break; } lowmem = mem; /* Ignoring the last page when ddr size is 128M. Cached * accesses to last page is causing the processor to prefetch * using address above 128M stepping out of the ddr address * space. */ if (c->cputype == CPU_74K && (mem == (128 << 20))) mem -= 0x1000; memblock_add(0, mem); } /* * This is the first serial on the chip common core, it is at this position * for sb (ssb) and ai (bcma) bus. */ #define BCM47XX_SERIAL_ADDR (SSB_ENUM_BASE + SSB_CHIPCO_UART0_DATA) void __init prom_init(void) { /* Cache CBR addr before CPU/DMA setup */ bmips_cbr_addr = BMIPS_GET_CBR(); prom_init_mem(); setup_8250_early_printk_port(CKSEG1ADDR(BCM47XX_SERIAL_ADDR), 0, 0); } #if defined(CONFIG_BCM47XX_BCMA) && defined(CONFIG_HIGHMEM) #define EXTVBASE 0xc0000000 #define ENTRYLO(x) ((pte_val(pfn_pte((x) >> PFN_PTE_SHIFT, PAGE_KERNEL_UNCACHED)) >> 6) | 1) #include <asm/tlbflush.h> /* Stripped version of tlb_init, with the call to build_tlb_refill_handler * dropped. Calling it at this stage causes a hang. */ static void early_tlb_init(void) { write_c0_pagemask(PM_DEFAULT_MASK); write_c0_wired(0); temp_tlb_entry = current_cpu_data.tlbsize - 1; local_flush_tlb_all(); } void __init bcm47xx_prom_highmem_init(void) { unsigned long off = (unsigned long)prom_init; unsigned long extmem = 0; bool highmem_region = false; if (WARN_ON(bcm47xx_bus_type != BCM47XX_BUS_TYPE_BCMA)) return; if (bcm47xx_bus.bcma.bus.chipinfo.id == BCMA_CHIP_ID_BCM4706) highmem_region = true; if (lowmem != 128 << 20 || !highmem_region) return; early_tlb_init(); /* Add one temporary TLB entry to map SDRAM Region 2. * Physical Virtual * 0x80000000 0xc0000000 (1st: 256MB) * 0x90000000 0xd0000000 (2nd: 256MB) */ add_temporary_entry(ENTRYLO(0x80000000), ENTRYLO(0x80000000 + (256 << 20)), EXTVBASE, PM_256M); off = EXTVBASE + __pa(off); for (extmem = 128 << 20; extmem < 512 << 20; extmem <<= 1) { if (!memcmp((void *)prom_init, (void *)(off + extmem), 16)) break; } extmem -= lowmem; early_tlb_init(); if (!extmem) return; pr_warn("Found %lu MiB of extra memory, but highmem is unsupported yet!\n", extmem >> 20); /* TODO: Register extra memory */ } #endif /* defined(CONFIG_BCM47XX_BCMA) && defined(CONFIG_HIGHMEM) */
