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
32 #include <asm/dma-coherence.h>
33 #include <asm/mipsregs.h>
34
35 #include <au1000.h>
36
37 extern void __init board_setup(void);
38 extern void __init alchemy_set_lpj(void);
39
plat_mem_setup(void)40 void __init plat_mem_setup(void)
41 {
42 alchemy_set_lpj();
43
44 if (au1xxx_cpu_needs_config_od())
45 /* Various early Au1xx0 errata corrected by this */
46 set_c0_config(1 << 19); /* Set Config[OD] */
47 else
48 /* Clear to obtain best system bus performance */
49 clear_c0_config(1 << 19); /* Clear Config[OD] */
50
51 hw_coherentio = 0;
52 coherentio = IO_COHERENCE_ENABLED;
53 switch (alchemy_get_cputype()) {
54 case ALCHEMY_CPU_AU1000:
55 case ALCHEMY_CPU_AU1500:
56 case ALCHEMY_CPU_AU1100:
57 coherentio = IO_COHERENCE_DISABLED;
58 break;
59 case ALCHEMY_CPU_AU1200:
60 /* Au1200 AB USB does not support coherent memory */
61 if (0 == (read_c0_prid() & PRID_REV_MASK))
62 coherentio = IO_COHERENCE_DISABLED;
63 break;
64 }
65
66 board_setup(); /* board specific setup */
67
68 /* IO/MEM resources. */
69 set_io_port_base(0);
70 ioport_resource.start = IOPORT_RESOURCE_START;
71 ioport_resource.end = IOPORT_RESOURCE_END;
72 iomem_resource.start = IOMEM_RESOURCE_START;
73 iomem_resource.end = IOMEM_RESOURCE_END;
74 }
75
76 #ifdef CONFIG_MIPS_FIXUP_BIGPHYS_ADDR
77 /* This routine should be valid for all Au1x based boards */
fixup_bigphys_addr(phys_addr_t phys_addr,phys_addr_t size)78 phys_addr_t fixup_bigphys_addr(phys_addr_t phys_addr, phys_addr_t size)
79 {
80 unsigned long start = ALCHEMY_PCI_MEMWIN_START;
81 unsigned long end = ALCHEMY_PCI_MEMWIN_END;
82
83 /* Don't fixup 36-bit addresses */
84 if ((phys_addr >> 32) != 0)
85 return phys_addr;
86
87 /* Check for PCI memory window */
88 if (phys_addr >= start && (phys_addr + size - 1) <= end)
89 return (phys_addr_t)(AU1500_PCI_MEM_PHYS_ADDR + phys_addr);
90
91 /* default nop */
92 return phys_addr;
93 }
94
io_remap_pfn_range(struct vm_area_struct * vma,unsigned long vaddr,unsigned long pfn,unsigned long size,pgprot_t prot)95 int io_remap_pfn_range(struct vm_area_struct *vma, unsigned long vaddr,
96 unsigned long pfn, unsigned long size, pgprot_t prot)
97 {
98 phys_addr_t phys_addr = fixup_bigphys_addr(pfn << PAGE_SHIFT, size);
99
100 return remap_pfn_range(vma, vaddr, phys_addr >> PAGE_SHIFT, size, prot);
101 }
102 EXPORT_SYMBOL(io_remap_pfn_range);
103 #endif /* CONFIG_MIPS_FIXUP_BIGPHYS_ADDR */
104
