1 /* 2 * Copyright 2000, 2007-2008 MontaVista Software Inc. 3 * Author: MontaVista Software, Inc. <source@mvista.com 4 * 5 * Updates to 2.6, Pete Popov, Embedded Alley Solutions, Inc. 6 * 7 * This program is free software; you can redistribute it and/or modify it 8 * under the terms of the GNU General Public License as published by the 9 * Free Software Foundation; either version 2 of the License, or (at your 10 * option) any later version. 11 * 12 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED 13 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 14 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN 15 * NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 16 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 17 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF 18 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON 19 * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 20 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 21 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 22 * 23 * You should have received a copy of the GNU General Public License along 24 * with this program; if not, write to the Free Software Foundation, Inc., 25 * 675 Mass Ave, Cambridge, MA 02139, USA. 26 */ 27 28 #include <linux/init.h> 29 #include <linux/ioport.h> 30 #include <linux/mm.h> 31 #include <linux/dma-map-ops.h> /* for dma_default_coherent */ 32 33 #include <asm/bootinfo.h> 34 #include <asm/mipsregs.h> 35 36 #include <au1000.h> 37 38 static bool alchemy_dma_coherent(void) 39 { 40 switch (alchemy_get_cputype()) { 41 case ALCHEMY_CPU_AU1000: 42 case ALCHEMY_CPU_AU1500: 43 case ALCHEMY_CPU_AU1100: 44 return false; 45 case ALCHEMY_CPU_AU1200: 46 /* Au1200 AB USB does not support coherent memory */ 47 if ((read_c0_prid() & PRID_REV_MASK) == 0) 48 return false; 49 return true; 50 default: 51 return true; 52 } 53 } 54 55 void __init plat_mem_setup(void) 56 { 57 alchemy_set_lpj(); 58 59 if (au1xxx_cpu_needs_config_od()) 60 /* Various early Au1xx0 errata corrected by this */ 61 set_c0_config(1 << 19); /* Set Config[OD] */ 62 else 63 /* Clear to obtain best system bus performance */ 64 clear_c0_config(1 << 19); /* Clear Config[OD] */ 65 66 dma_default_coherent = alchemy_dma_coherent(); 67 68 board_setup(); /* board specific setup */ 69 70 /* IO/MEM resources. */ 71 set_io_port_base(0); 72 ioport_resource.start = IOPORT_RESOURCE_START; 73 ioport_resource.end = IOPORT_RESOURCE_END; 74 iomem_resource.start = IOMEM_RESOURCE_START; 75 iomem_resource.end = IOMEM_RESOURCE_END; 76 } 77 78 #ifdef CONFIG_MIPS_FIXUP_BIGPHYS_ADDR 79 /* This routine should be valid for all Au1x based boards */ 80 phys_addr_t fixup_bigphys_addr(phys_addr_t phys_addr, phys_addr_t size) 81 { 82 unsigned long start = ALCHEMY_PCI_MEMWIN_START; 83 unsigned long end = ALCHEMY_PCI_MEMWIN_END; 84 85 /* Don't fixup 36-bit addresses */ 86 if ((phys_addr >> 32) != 0) 87 return phys_addr; 88 89 /* Check for PCI memory window */ 90 if (phys_addr >= start && (phys_addr + size - 1) <= end) 91 return (phys_addr_t)(AU1500_PCI_MEM_PHYS_ADDR + phys_addr); 92 93 /* default nop */ 94 return phys_addr; 95 } 96 97 int io_remap_pfn_range(struct vm_area_struct *vma, unsigned long vaddr, 98 unsigned long pfn, unsigned long size, pgprot_t prot) 99 { 100 phys_addr_t phys_addr = fixup_bigphys_addr(pfn << PAGE_SHIFT, size); 101 102 return remap_pfn_range(vma, vaddr, phys_addr >> PAGE_SHIFT, size, prot); 103 } 104 EXPORT_SYMBOL(io_remap_pfn_range); 105 #endif /* CONFIG_MIPS_FIXUP_BIGPHYS_ADDR */ 106