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authorAndré Fabian Silva Delgado <emulatorman@parabola.nu>2015-08-05 17:04:01 -0300
committerAndré Fabian Silva Delgado <emulatorman@parabola.nu>2015-08-05 17:04:01 -0300
commit57f0f512b273f60d52568b8c6b77e17f5636edc0 (patch)
tree5e910f0e82173f4ef4f51111366a3f1299037a7b /arch/hexagon/kernel/setup.c
Initial import
Diffstat (limited to 'arch/hexagon/kernel/setup.c')
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diff --git a/arch/hexagon/kernel/setup.c b/arch/hexagon/kernel/setup.c
new file mode 100644
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+++ b/arch/hexagon/kernel/setup.c
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+/*
+ * Arch related setup for Hexagon
+ *
+ * Copyright (c) 2010-2013, The Linux Foundation. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 and
+ * only version 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * 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., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301, USA.
+ */
+
+#include <linux/init.h>
+#include <linux/delay.h>
+#include <linux/bootmem.h>
+#include <linux/mmzone.h>
+#include <linux/mm.h>
+#include <linux/seq_file.h>
+#include <linux/console.h>
+#include <linux/of_fdt.h>
+#include <asm/io.h>
+#include <asm/sections.h>
+#include <asm/setup.h>
+#include <asm/processor.h>
+#include <asm/hexagon_vm.h>
+#include <asm/vm_mmu.h>
+#include <asm/time.h>
+
+char cmd_line[COMMAND_LINE_SIZE];
+static char default_command_line[COMMAND_LINE_SIZE] __initdata = CONFIG_CMDLINE;
+
+int on_simulator;
+
+void calibrate_delay(void)
+{
+ loops_per_jiffy = thread_freq_mhz * 1000000 / HZ;
+}
+
+/*
+ * setup_arch - high level architectural setup routine
+ * @cmdline_p: pointer to pointer to command-line arguments
+ */
+
+void __init setup_arch(char **cmdline_p)
+{
+ char *p = &external_cmdline_buffer;
+
+ /*
+ * These will eventually be pulled in via either some hypervisor
+ * or devicetree description. Hardwiring for now.
+ */
+ pcycle_freq_mhz = 600;
+ thread_freq_mhz = 100;
+ sleep_clk_freq = 32000;
+
+ /*
+ * Set up event bindings to handle exceptions and interrupts.
+ */
+ __vmsetvec(_K_VM_event_vector);
+
+ printk(KERN_INFO "PHYS_OFFSET=0x%08x\n", PHYS_OFFSET);
+
+ /*
+ * Simulator has a few differences from the hardware.
+ * For now, check uninitialized-but-mapped memory
+ * prior to invoking setup_arch_memory().
+ */
+ if (*(int *)((unsigned long)_end + 8) == 0x1f1f1f1f)
+ on_simulator = 1;
+ else
+ on_simulator = 0;
+
+ if (p[0] != '\0')
+ strlcpy(boot_command_line, p, COMMAND_LINE_SIZE);
+ else
+ strlcpy(boot_command_line, default_command_line,
+ COMMAND_LINE_SIZE);
+
+ /*
+ * boot_command_line and the value set up by setup_arch
+ * are both picked up by the init code. If no reason to
+ * make them different, pass the same pointer back.
+ */
+ strlcpy(cmd_line, boot_command_line, COMMAND_LINE_SIZE);
+ *cmdline_p = cmd_line;
+
+ parse_early_param();
+
+ setup_arch_memory();
+
+#ifdef CONFIG_SMP
+ smp_start_cpus();
+#endif
+}
+
+/*
+ * Functions for dumping CPU info via /proc
+ * Probably should move to kernel/proc.c or something.
+ */
+static void *c_start(struct seq_file *m, loff_t *pos)
+{
+ return *pos < nr_cpu_ids ? (void *)((unsigned long) *pos + 1) : NULL;
+}
+
+static void *c_next(struct seq_file *m, void *v, loff_t *pos)
+{
+ ++*pos;
+ return c_start(m, pos);
+}
+
+static void c_stop(struct seq_file *m, void *v)
+{
+}
+
+/*
+ * Eventually this will dump information about
+ * CPU properties like ISA level, TLB size, etc.
+ */
+static int show_cpuinfo(struct seq_file *m, void *v)
+{
+ int cpu = (unsigned long) v - 1;
+
+#ifdef CONFIG_SMP
+ if (!cpu_online(cpu))
+ return 0;
+#endif
+
+ seq_printf(m, "processor\t: %d\n", cpu);
+ seq_printf(m, "model name\t: Hexagon Virtual Machine\n");
+ seq_printf(m, "BogoMips\t: %lu.%02lu\n",
+ (loops_per_jiffy * HZ) / 500000,
+ ((loops_per_jiffy * HZ) / 5000) % 100);
+ seq_printf(m, "\n");
+ return 0;
+}
+
+const struct seq_operations cpuinfo_op = {
+ .start = &c_start,
+ .next = &c_next,
+ .stop = &c_stop,
+ .show = &show_cpuinfo,
+};