patch-2.4.9 linux/arch/arm/mach-sa1100/generic.c

• Lines: 174
• Date: Sun Aug 12 17:36:24 2001
• Orig file: v2.4.8/linux/arch/arm/mach-sa1100/generic.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.4.8/linux/arch/arm/mach-sa1100/generic.c linux/arch/arm/mach-sa1100/generic.c
@@ -0,0 +1,173 @@
+/*
+ * linux/arch/arm/mach-sa1100/generic.c
+ *
+ * Author: Nicolas Pitre
+ *
+ * Code common to all SA11x0 machines.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * Since this file should be linked before any other machine specific file,
+ * the __initcall() here will be executed first.  This serves as default
+ * initialization stuff for SA1100 machines which can be overriden later if
+ * need be.
+ */
+#include <linux/config.h>
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/delay.h>
+#include <linux/pm.h>
+#include <linux/cpufreq.h>
+
+#include <asm/hardware.h>
+#include <asm/system.h>
+#include <asm/pgtable.h>
+#include <asm/mach/map.h>
+
+#include "generic.h"
+
+#define NR_FREQS	16
+
+/*
+ * This table is setup for a 3.6864MHz Crystal.
+ */
+static const unsigned short cclk_frequency_100khz[NR_FREQS] = {
+	 590,	/*  59.0 MHz */
+	 737,	/*  73.7 MHz */
+	 885, 	/*  88.5 MHz */
+	1032,	/* 103.2 MHz */
+	1180,	/* 118.0 MHz */
+	1327,	/* 132.7 MHz */
+	1475,	/* 147.5 MHz */
+	1622,	/* 162.2 MHz */
+	1769,	/* 176.9 MHz */
+	1917,	/* 191.7 MHz */
+	2064,	/* 206.4 MHz */
+	2212,	/* 221.2 MHz */
+	2359,   /* 235.9 MHz */
+	2507,   /* 250.7 MHz */
+	2654,   /* 265.4 MHz */
+	2802    /* 280.2 MHz */
+};
+
+/*
+ * Return the current CPU clock frequency in units of 100kHz
+ */
+unsigned short get_cclk_frequency(void)
+{
+	return cclk_frequency_100khz[PPCR & 0xf];
+}
+
+EXPORT_SYMBOL(get_cclk_frequency);
+
+#ifdef CONFIG_CPU_FREQ
+
+/*
+ * Validate the speed in khz.  If we can't generate the precise
+ * frequency requested, round it down (to be on the safe side).
+ */
+unsigned int cpufreq_validatespeed(unsigned int khz)
+{
+	int i;
+
+	khz /= 100;
+
+	for (i = NR_FREQS - 1; i > 0; i--)
+		if (cclk_frequency_100khz[i] <= khz)
+			break;
+
+	return cclk_frequency_100khz[i] * 100;
+}
+
+/*
+ * Ok, set the CPU frequency.  Since we've done the validation
+ * above, we can match for an exact frequency.  If we don't find
+ * an exact match, we will to set the lowest frequency to be safe.
+ */
+void cpufreq_setspeed(unsigned int khz)
+{
+	int i;
+
+	khz /= 100;
+
+	for (i = NR_FREQS - 1; i > 0; i--)
+		if (cclk_frequency_100khz[i] == khz)
+			break;
+//printk("setting ppcr to %d\n", i);
+	PPCR = i;
+}
+
+static int __init sa1100_init_clock(void)
+{
+	cpufreq_init(get_cclk_frequency() * 100);
+	return 0;
+}
+
+__initcall(sa1100_init_clock);
+#endif
+
+/*
+ * Default power-off for SA1100
+ */
+static void sa1100_power_off(void)
+{
+	mdelay(100);
+	cli();
+	/* disable internal oscillator, float CS lines */
+	PCFR = (PCFR_OPDE | PCFR_FP | PCFR_FS);
+	/* enable wake-up on GPIO0 (Assabet...) */
+	PWER = GFER = GRER = 1;
+	/*
+	 * set scratchpad to zero, just in case it is used as a
+	 * restart address by the bootloader.
+	 */
+	PSPR = 0;
+	/* enter sleep mode */
+	PMCR = PMCR_SF;
+}
+
+static int __init sa1100_set_poweroff(void)
+{
+	pm_power_off = sa1100_power_off;
+	return 0;
+}
+
+__initcall(sa1100_set_poweroff);
+
+
+/*
+ * Common I/O mapping:
+ *
+ * Typically, static virtual address mappings are as follow:
+ *
+ * 0xe8000000-0xefffffff:	flash memory (especially when multiple flash
+ * 				banks need to be mapped contigously)
+ * 0xf0000000-0xf3ffffff:	miscellaneous stuff (CPLDs, etc.)
+ * 0xf4000000-0xf4ffffff:	SA-1111
+ * 0xf5000000-0xf5ffffff:	reserved (used by cache flushing area)
+ * 0xf6000000-0xffffffff:	reserved (internal SA1100 IO defined above)
+ *
+ * Below 0xe8000000 is reserved for vm allocation.
+ *
+ * The machine specific code must provide the extra mapping beside the
+ * default mapping provided here.
+ */
+
+static struct map_desc standard_io_desc[] __initdata = {
+ /* virtual     physical    length      domain     r  w  c  b */
+  { 0xf6000000, 0x20000000, 0x01000000, DOMAIN_IO, 1, 1, 0, 0 }, /* PCMCIA0 IO */
+  { 0xf7000000, 0x30000000, 0x01000000, DOMAIN_IO, 1, 1, 0, 0 }, /* PCMCIA1 IO */
+  { 0xf8000000, 0x80000000, 0x00100000, DOMAIN_IO, 0, 1, 0, 0 }, /* PCM */
+  { 0xfa000000, 0x90000000, 0x00100000, DOMAIN_IO, 0, 1, 0, 0 }, /* SCM */
+  { 0xfc000000, 0xa0000000, 0x00100000, DOMAIN_IO, 0, 1, 0, 0 }, /* MER */
+  { 0xfe000000, 0xb0000000, 0x00200000, DOMAIN_IO, 0, 1, 0, 0 }, /* LCD + DMA */
+  LAST_DESC
+};
+
+void __init sa1100_map_io(void)
+{
+	iotable_init(standard_io_desc);
+}