patch-2.4.9 linux/arch/arm/mach-sa1100/generic.c
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- 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);
+}
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