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178 lines
5.4 KiB
178 lines
5.4 KiB
/* |
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* Copyright (C) 2004 Florian Schirmer <[email protected]> |
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* Copyright (C) 2007 Aurelien Jarno <[email protected]> |
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* Copyright (C) 2010-2012 Hauke Mehrtens <[email protected]> |
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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((void *)prom_init, (void *)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((void *)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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