Linux Kernel  3.7.1
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setup.c
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1 /*
2  * Copyright 2000, 2007-2008 MontaVista Software Inc.
3  * Author: MontaVista Software, Inc. <[email protected]
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/jiffies.h>
31 #include <linux/module.h>
32 
33 #include <asm/mipsregs.h>
34 #include <asm/time.h>
35 
36 #include <au1000.h>
37 
38 extern void __init board_setup(void);
39 extern void set_cpuspec(void);
40 
42 {
43  unsigned long est_freq;
44 
45  /* determine core clock */
46  est_freq = au1xxx_calc_clock();
47  est_freq += 5000; /* round */
48  est_freq -= est_freq % 10000;
49  printk(KERN_INFO "(PRId %08x) @ %lu.%02lu MHz\n", read_c0_prid(),
50  est_freq / 1000000, ((est_freq % 1000000) * 100) / 1000000);
51 
52  /* this is faster than wasting cycles trying to approximate it */
53  preset_lpj = (est_freq >> 1) / HZ;
54 
55  if (au1xxx_cpu_needs_config_od())
56  /* Various early Au1xx0 errata corrected by this */
57  set_c0_config(1 << 19); /* Set Config[OD] */
58  else
59  /* Clear to obtain best system bus performance */
60  clear_c0_config(1 << 19); /* Clear Config[OD] */
61 
62  board_setup(); /* board specific setup */
63 
64  /* IO/MEM resources. */
65  set_io_port_base(0);
70 }
71 
72 #if defined(CONFIG_64BIT_PHYS_ADDR) && defined(CONFIG_PCI)
73 /* This routine should be valid for all Au1x based boards */
74 phys_t __fixup_bigphys_addr(phys_t phys_addr, phys_t size)
75 {
76  unsigned long start = ALCHEMY_PCI_MEMWIN_START;
77  unsigned long end = ALCHEMY_PCI_MEMWIN_END;
78 
79  /* Don't fixup 36-bit addresses */
80  if ((phys_addr >> 32) != 0)
81  return phys_addr;
82 
83  /* Check for PCI memory window */
84  if (phys_addr >= start && (phys_addr + size - 1) <= end)
86 
87  /* default nop */
88  return phys_addr;
89 }
90 EXPORT_SYMBOL(__fixup_bigphys_addr);
91 #endif