1/*
2 * BRIEF MODULE DESCRIPTION
3 *	Simple Au1000 clocks routines.
4 *
5 * Copyright 2001 MontaVista Software Inc.
6 * Author: MontaVista Software, Inc.
7 *		ppopov@mvista.com or source@mvista.com
8 *
9 *  This program is free software; you can redistribute	 it and/or modify it
10 *  under  the terms of	 the GNU General  Public License as published by the
11 *  Free Software Foundation;  either version 2 of the	License, or (at your
12 *  option) any later version.
13 *
14 *  THIS  SOFTWARE  IS PROVIDED	  ``AS	IS'' AND   ANY	EXPRESS OR IMPLIED
15 *  WARRANTIES,	  INCLUDING, BUT NOT  LIMITED  TO, THE IMPLIED WARRANTIES OF
16 *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN
17 *  NO	EVENT  SHALL   THE AUTHOR  BE	 LIABLE FOR ANY	  DIRECT, INDIRECT,
18 *  INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
19 *  NOT LIMITED	  TO, PROCUREMENT OF  SUBSTITUTE GOODS	OR SERVICES; LOSS OF
20 *  USE, DATA,	OR PROFITS; OR	BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
21 *  ANY THEORY OF LIABILITY, WHETHER IN	 CONTRACT, STRICT LIABILITY, OR TORT
22 *  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
23 *  THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
24 *
25 *  You should have received a copy of the  GNU General Public License along
26 *  with this program; if not, write  to the Free Software Foundation, Inc.,
27 *  675 Mass Ave, Cambridge, MA 02139, USA.
28 */
29
30#include <linux/module.h>
31#include <asm/mach-au1x00/au1000.h>
32
33static unsigned int au1x00_clock; // Hz
34static unsigned int lcd_clock;    // KHz
35static unsigned long uart_baud_base;
36
37/*
38 * Set the au1000_clock
39 */
40void set_au1x00_speed(unsigned int new_freq)
41{
42	au1x00_clock = new_freq;
43}
44
45unsigned int get_au1x00_speed(void)
46{
47	return au1x00_clock;
48}
49
50
51
52/*
53 * The UART baud base is not known at compile time ... if
54 * we want to be able to use the same code on different
55 * speed CPUs.
56 */
57unsigned long get_au1x00_uart_baud_base(void)
58{
59	return uart_baud_base;
60}
61
62void set_au1x00_uart_baud_base(unsigned long new_baud_base)
63{
64	uart_baud_base = new_baud_base;
65}
66
67/*
68 * Calculate the Au1x00's LCD clock based on the current
69 * cpu clock and the system bus clock, and try to keep it
70 * below 40 MHz (the Pb1000 board can lock-up if the LCD
71 * clock is over 40 MHz).
72 */
73void set_au1x00_lcd_clock(void)
74{
75	unsigned int static_cfg0;
76	unsigned int sys_busclk =
77		(get_au1x00_speed()/1000) /
78		((int)(au_readl(SYS_POWERCTRL)&0x03) + 2);
79
80	static_cfg0 = au_readl(MEM_STCFG0);
81
82	if (static_cfg0 & (1<<11))
83		lcd_clock = sys_busclk / 5; /* note: BCLK switching fails with D5 */
84	else
85		lcd_clock = sys_busclk / 4;
86
87	if (lcd_clock > 50000) /* Epson MAX */
88		printk("warning: LCD clock too high (%d KHz)\n", lcd_clock);
89}
90
91unsigned int get_au1x00_lcd_clock(void)
92{
93	return lcd_clock;
94}
95
96EXPORT_SYMBOL(get_au1x00_lcd_clock);
97