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Diffstat (limited to 'arch/mips/alchemy/common/setup.c')
| -rw-r--r-- | arch/mips/alchemy/common/setup.c | 107 |
1 files changed, 107 insertions, 0 deletions
diff --git a/arch/mips/alchemy/common/setup.c b/arch/mips/alchemy/common/setup.c new file mode 100644 index 000000000..2388d6878 --- /dev/null +++ b/arch/mips/alchemy/common/setup.c @@ -0,0 +1,107 @@ +/* + * Copyright 2000, 2007-2008 MontaVista Software Inc. + * Author: MontaVista Software, Inc. <source@mvista.com + * + * Updates to 2.6, Pete Popov, Embedded Alley Solutions, Inc. + * + * 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/ioport.h> +#include <linux/mm.h> +#include <linux/dma-map-ops.h> /* for dma_default_coherent */ + +#include <asm/mipsregs.h> + +#include <au1000.h> + +extern void __init board_setup(void); +extern void __init alchemy_set_lpj(void); + +static bool alchemy_dma_coherent(void) +{ + switch (alchemy_get_cputype()) { + case ALCHEMY_CPU_AU1000: + case ALCHEMY_CPU_AU1500: + case ALCHEMY_CPU_AU1100: + return false; + case ALCHEMY_CPU_AU1200: + /* Au1200 AB USB does not support coherent memory */ + if ((read_c0_prid() & PRID_REV_MASK) == 0) + return false; + return true; + default: + return true; + } +} + +void __init plat_mem_setup(void) +{ + alchemy_set_lpj(); + + if (au1xxx_cpu_needs_config_od()) + /* Various early Au1xx0 errata corrected by this */ + set_c0_config(1 << 19); /* Set Config[OD] */ + else + /* Clear to obtain best system bus performance */ + clear_c0_config(1 << 19); /* Clear Config[OD] */ + + dma_default_coherent = alchemy_dma_coherent(); + + board_setup(); /* board specific setup */ + + /* IO/MEM resources. */ + set_io_port_base(0); + ioport_resource.start = IOPORT_RESOURCE_START; + ioport_resource.end = IOPORT_RESOURCE_END; + iomem_resource.start = IOMEM_RESOURCE_START; + iomem_resource.end = IOMEM_RESOURCE_END; +} + +#ifdef CONFIG_MIPS_FIXUP_BIGPHYS_ADDR +/* This routine should be valid for all Au1x based boards */ +phys_addr_t fixup_bigphys_addr(phys_addr_t phys_addr, phys_addr_t size) +{ + unsigned long start = ALCHEMY_PCI_MEMWIN_START; + unsigned long end = ALCHEMY_PCI_MEMWIN_END; + + /* Don't fixup 36-bit addresses */ + if ((phys_addr >> 32) != 0) + return phys_addr; + + /* Check for PCI memory window */ + if (phys_addr >= start && (phys_addr + size - 1) <= end) + return (phys_addr_t)(AU1500_PCI_MEM_PHYS_ADDR + phys_addr); + + /* default nop */ + return phys_addr; +} + +int io_remap_pfn_range(struct vm_area_struct *vma, unsigned long vaddr, + unsigned long pfn, unsigned long size, pgprot_t prot) +{ + phys_addr_t phys_addr = fixup_bigphys_addr(pfn << PAGE_SHIFT, size); + + return remap_pfn_range(vma, vaddr, phys_addr >> PAGE_SHIFT, size, prot); +} +EXPORT_SYMBOL(io_remap_pfn_range); +#endif /* CONFIG_MIPS_FIXUP_BIGPHYS_ADDR */ |