patch-2.4.19 linux-2.4.19/arch/mips/au1000/common/clocks.c

• Lines: 99
• Date: Fri Aug 2 17:39:43 2002
• Orig file: linux-2.4.18/arch/mips/au1000/common/clocks.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -urN linux-2.4.18/arch/mips/au1000/common/clocks.c linux-2.4.19/arch/mips/au1000/common/clocks.c
@@ -0,0 +1,98 @@
+/*
+ * BRIEF MODULE DESCRIPTION
+ *	Simple Au1000 clocks routines.
+ *
+ * Copyright 2001 MontaVista Software Inc.
+ * Author: MontaVista Software, Inc.
+ *		ppopov@mvista.com or source@mvista.com
+ *
+ *  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/module.h>
+#include <asm/au1000.h>
+
+static unsigned int au1000_clock; // Hz
+static unsigned int lcd_clock;    // KHz
+static unsigned long uart_baud_base;
+
+/*
+ * Set the au1000_clock
+ */
+void set_au1000_speed(unsigned int new_freq)
+{
+	au1000_clock = new_freq;
+}
+
+unsigned int get_au1000_speed(void)
+{
+	return au1000_clock;
+}
+
+
+
+/*
+ * The UART baud base is not known at compile time ... if
+ * we want to be able to use the same code on different
+ * speed CPUs.
+ */
+unsigned long get_au1000_uart_baud_base(void)
+{
+	return uart_baud_base;
+}
+
+void set_au1000_uart_baud_base(unsigned long new_baud_base)
+{
+	uart_baud_base = new_baud_base;
+}
+
+/*
+ * Calculate the Au1000's LCD clock based on the current
+ * cpu clock and the system bus clock, and try to keep it
+ * below 40 MHz (the Pb1000 board can lock-up if the LCD
+ * clock is over 40 MHz).
+ */
+void set_au1000_lcd_clock(void)
+{
+	unsigned int static_cfg0;
+	unsigned int sys_busclk =
+		(get_au1000_speed()/1000) /
+		((int)(inl(SYS_POWERCTRL)&0x03) + 2);
+
+	static_cfg0 = inl(MEM_STCFG0);
+
+	if (static_cfg0 & (1<<11))
+		lcd_clock = sys_busclk / 5; /* note: BCLK switching fails with D5 */
+	else
+		lcd_clock = sys_busclk / 4;
+
+	if (lcd_clock > 50000) /* Epson MAX */
+			printk(__FUNCTION__
+			       ": warning: LCD clock too high (%d KHz)\n",
+			       lcd_clock);
+}
+
+unsigned int get_au1000_lcd_clock(void)
+{
+	return lcd_clock;
+}
+
+EXPORT_SYMBOL(get_au1000_lcd_clock);