[PATCH] xtensa: Architecture support for Tensilica Xtensa Part 3

The attached patches provides part 3 of an architecture implementation for the
Tensilica Xtensa CPU series.

Signed-off-by: Chris Zankel <chris@zankel.net>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 520 insertions, 0 deletions

diff --git a/arch/xtensa/kernel/setup.c b/arch/xtensa/kernel/setup.c
new file mode 100644
index 0000000..1f5bf5d
--- /dev/null
+++ b/arch/xtensa/kernel/setup.c
@@ -0,0 +1,520 @@
+/*
+ * arch/xtensa/setup.c
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * Copyright (C) 1995  Linus Torvalds
+ * Copyright (C) 2001 - 2005  Tensilica Inc.
+ *
+ * Chris Zankel	<chris@zankel.net>
+ * Joe Taylor	<joe@tensilica.com, joetylr@yahoo.com>
+ * Kevin Chea
+ * Marc Gauthier<marc@tensilica.com> <marc@alumni.uwaterloo.ca>
+ */
+
+#include <linux/config.h>
+#include <linux/errno.h>
+#include <linux/init.h>
+#include <linux/proc_fs.h>
+#include <linux/tty.h>
+#include <linux/bootmem.h>
+#include <linux/kernel.h>
+
+#if defined(CONFIG_VGA_CONSOLE) || defined(CONFIG_DUMMY_CONSOLE)
+# include <linux/console.h>
+#endif
+
+#ifdef CONFIG_RTC
+# include <linux/timex.h>
+#endif
+
+#ifdef CONFIG_PROC_FS
+# include <linux/seq_file.h>
+#endif
+
+#include <asm/system.h>
+#include <asm/bootparam.h>
+#include <asm/pgtable.h>
+#include <asm/processor.h>
+#include <asm/timex.h>
+#include <asm/platform.h>
+#include <asm/page.h>
+#include <asm/setup.h>
+
+#include <xtensa/config/system.h>
+
+#if defined(CONFIG_VGA_CONSOLE) || defined(CONFIG_DUMMY_CONSOLE)
+struct screen_info screen_info = { 0, 24, 0, 0, 0, 80, 0, 0, 0, 24, 1, 16};
+#endif
+
+#ifdef CONFIG_BLK_DEV_FD
+extern struct fd_ops no_fd_ops;
+struct fd_ops *fd_ops;
+#endif
+
+#if defined(CONFIG_BLK_DEV_IDE) || defined(CONFIG_BLK_DEV_IDE_MODULE)
+extern struct ide_ops no_ide_ops;
+struct ide_ops *ide_ops;
+#endif
+
+extern struct rtc_ops no_rtc_ops;
+struct rtc_ops *rtc_ops;
+
+#ifdef CONFIG_PC_KEYB
+extern struct kbd_ops no_kbd_ops;
+struct kbd_ops *kbd_ops;
+#endif
+
+#ifdef CONFIG_BLK_DEV_INITRD
+extern void *initrd_start;
+extern void *initrd_end;
+extern void *__initrd_start;
+extern void *__initrd_end;
+int initrd_is_mapped = 0;
+extern int initrd_below_start_ok;
+#endif
+
+unsigned char aux_device_present;
+extern unsigned long loops_per_jiffy;
+
+/* Command line specified as configuration option. */
+
+static char command_line[COMMAND_LINE_SIZE];
+
+#ifdef CONFIG_CMDLINE_BOOL
+static char default_command_line[COMMAND_LINE_SIZE] __initdata = CONFIG_CMDLINE;
+#endif
+
+sysmem_info_t __initdata sysmem;
+
+#ifdef CONFIG_BLK_DEV_INITRD
+int initrd_is_mapped;
+#endif
+
+extern void init_mmu(void);
+
+/*
+ * Boot parameter parsing.
+ *
+ * The Xtensa port uses a list of variable-sized tags to pass data to
+ * the kernel. The first tag must be a BP_TAG_FIRST tag for the list
+ * to be recognised. The list is terminated with a zero-sized
+ * BP_TAG_LAST tag.
+ */
+
+typedef struct tagtable {
+	u32 tag;
+	int (*parse)(const bp_tag_t*);
+} tagtable_t;
+
+#define __tagtable(tag, fn) static tagtable_t __tagtable_##fn 		\
+	__attribute__((unused, __section__(".taglist"))) = { tag, fn }
+
+/* parse current tag */
+
+static int __init parse_tag_mem(const bp_tag_t *tag)
+{
+	meminfo_t *mi = (meminfo_t*)(tag->data);
+
+	if (mi->type != MEMORY_TYPE_CONVENTIONAL)
+		return -1;
+
+	if (sysmem.nr_banks >= SYSMEM_BANKS_MAX) {
+		printk(KERN_WARNING
+		       "Ignoring memory bank 0x%08lx size %ldKB\n",
+		       (unsigned long)mi->start,
+		       (unsigned long)mi->end - (unsigned long)mi->start);
+		return -EINVAL;
+	}
+	sysmem.bank[sysmem.nr_banks].type  = mi->type;
+	sysmem.bank[sysmem.nr_banks].start = PAGE_ALIGN(mi->start);
+	sysmem.bank[sysmem.nr_banks].end   = mi->end & PAGE_SIZE;
+	sysmem.nr_banks++;
+
+	return 0;
+}
+
+__tagtable(BP_TAG_MEMORY, parse_tag_mem);
+
+#ifdef CONFIG_BLK_DEV_INITRD
+
+static int __init parse_tag_initrd(const bp_tag_t* tag)
+{
+	meminfo_t* mi;
+	mi = (meminfo_t*)(tag->data);
+	initrd_start = (void*)(mi->start);
+	initrd_end = (void*)(mi->end);
+
+	return 0;
+}
+
+__tagtable(BP_TAG_INITRD, parse_tag_initrd);
+
+#endif /* CONFIG_BLK_DEV_INITRD */
+
+static int __init parse_tag_cmdline(const bp_tag_t* tag)
+{
+	strncpy(command_line, (char*)(tag->data), COMMAND_LINE_SIZE);
+	command_line[COMMAND_LINE_SIZE - 1] = '\0';
+	return 0;
+}
+
+__tagtable(BP_TAG_COMMAND_LINE, parse_tag_cmdline);
+
+static int __init parse_bootparam(const bp_tag_t* tag)
+{
+	extern tagtable_t __tagtable_begin, __tagtable_end;
+	tagtable_t *t;
+
+	/* Boot parameters must start with a BP_TAG_FIRST tag. */
+
+	if (tag->id != BP_TAG_FIRST) {
+		printk(KERN_WARNING "Invalid boot parameters!\n");
+		return 0;
+	}
+
+	tag = (bp_tag_t*)((unsigned long)tag + sizeof(bp_tag_t) + tag->size);
+
+	/* Parse all tags. */
+
+	while (tag != NULL && tag->id != BP_TAG_LAST) {
+	 	for (t = &__tagtable_begin; t < &__tagtable_end; t++) {
+			if (tag->id == t->tag) {
+				t->parse(tag);
+				break;
+			}
+		}
+		if (t == &__tagtable_end)
+			printk(KERN_WARNING "Ignoring tag "
+			       "0x%08x\n", tag->id);
+		tag = (bp_tag_t*)((unsigned long)(tag + 1) + tag->size);
+	}
+
+	return 0;
+}
+
+/*
+ * Initialize architecture. (Early stage)
+ */
+
+void __init init_arch(bp_tag_t *bp_start)
+{
+
+#ifdef CONFIG_BLK_DEV_INITRD
+	initrd_start = &__initrd_start;
+	initrd_end = &__initrd_end;
+#endif
+
+	sysmem.nr_banks = 0;
+
+#ifdef CONFIG_CMDLINE_BOOL
+	strcpy(command_line, default_command_line);
+#endif
+
+	/* Parse boot parameters */
+
+        if (bp_start)
+	  parse_bootparam(bp_start);
+
+	if (sysmem.nr_banks == 0) {
+		sysmem.nr_banks = 1;
+		sysmem.bank[0].start = PLATFORM_DEFAULT_MEM_START;
+		sysmem.bank[0].end = PLATFORM_DEFAULT_MEM_START
+				     + PLATFORM_DEFAULT_MEM_SIZE;
+	}
+
+	/* Early hook for platforms */
+
+	platform_init(bp_start);
+
+	/* Initialize MMU. */
+
+	init_mmu();
+}
+
+/*
+ * Initialize system. Setup memory and reserve regions.
+ */
+
+extern char _end;
+extern char _stext;
+extern char _WindowVectors_text_start;
+extern char _WindowVectors_text_end;
+extern char _DebugInterruptVector_literal_start;
+extern char _DebugInterruptVector_text_end;
+extern char _KernelExceptionVector_literal_start;
+extern char _KernelExceptionVector_text_end;
+extern char _UserExceptionVector_literal_start;
+extern char _UserExceptionVector_text_end;
+extern char _DoubleExceptionVector_literal_start;
+extern char _DoubleExceptionVector_text_end;
+
+void __init setup_arch(char **cmdline_p)
+{
+	extern int mem_reserve(unsigned long, unsigned long, int);
+	extern void bootmem_init(void);
+
+	memcpy(saved_command_line, command_line, COMMAND_LINE_SIZE);
+	saved_command_line[COMMAND_LINE_SIZE-1] = '\0';
+	*cmdline_p = command_line;
+
+	/* Reserve some memory regions */
+
+#ifdef CONFIG_BLK_DEV_INITRD
+	if (initrd_start < initrd_end) {
+		initrd_is_mapped = mem_reserve(__pa(initrd_start),
+					       __pa(initrd_end), 0);
+		initrd_below_start_ok = 1;
+ 	} else {
+		initrd_start = 0;
+	}
+#endif
+
+	mem_reserve(__pa(&_stext),__pa(&_end), 1);
+
+	mem_reserve(__pa(&_WindowVectors_text_start),
+		    __pa(&_WindowVectors_text_end), 0);
+
+	mem_reserve(__pa(&_DebugInterruptVector_literal_start),
+		    __pa(&_DebugInterruptVector_text_end), 0);
+
+	mem_reserve(__pa(&_KernelExceptionVector_literal_start),
+		    __pa(&_KernelExceptionVector_text_end), 0);
+
+	mem_reserve(__pa(&_UserExceptionVector_literal_start),
+		    __pa(&_UserExceptionVector_text_end), 0);
+
+	mem_reserve(__pa(&_DoubleExceptionVector_literal_start),
+		    __pa(&_DoubleExceptionVector_text_end), 0);
+
+	bootmem_init();
+
+	platform_setup(cmdline_p);
+
+
+	paging_init();
+
+#ifdef CONFIG_VT
+# if defined(CONFIG_VGA_CONSOLE)
+	conswitchp = &vga_con;
+# elif defined(CONFIG_DUMMY_CONSOLE)
+	conswitchp = &dummy_con;
+# endif
+#endif
+
+#if CONFIG_PCI
+	platform_pcibios_init();
+#endif
+}
+
+void machine_restart(char * cmd)
+{
+	platform_restart();
+}
+
+void machine_halt(void)
+{
+	platform_halt();
+	while (1);
+}
+
+void machine_power_off(void)
+{
+	platform_power_off();
+	while (1);
+}
+#ifdef CONFIG_PROC_FS
+
+/*
+ * Display some core information through /proc/cpuinfo.
+ */
+
+static int
+c_show(struct seq_file *f, void *slot)
+{
+	/* high-level stuff */
+	seq_printf(f,"processor\t: 0\n"
+		     "vendor_id\t: Tensilica\n"
+		     "model\t\t: Xtensa " XCHAL_HW_RELEASE_NAME "\n"
+		     "core ID\t\t: " XCHAL_CORE_ID "\n"
+		     "build ID\t: 0x%x\n"
+		     "byte order\t: %s\n"
+ 		     "cpu MHz\t\t: %lu.%02lu\n"
+		     "bogomips\t: %lu.%02lu\n",
+		     XCHAL_BUILD_UNIQUE_ID,
+		     XCHAL_HAVE_BE ?  "big" : "little",
+		     CCOUNT_PER_JIFFY/(1000000/HZ),
+		     (CCOUNT_PER_JIFFY/(10000/HZ)) % 100,
+		     loops_per_jiffy/(500000/HZ),
+		     (loops_per_jiffy/(5000/HZ)) % 100);
+
+	seq_printf(f,"flags\t\t: "
+#if XCHAL_HAVE_NMI
+		     "nmi "
+#endif
+#if XCHAL_HAVE_DEBUG
+		     "debug "
+# if XCHAL_HAVE_OCD
+		     "ocd "
+# endif
+#endif
+#if XCHAL_HAVE_DENSITY
+	    	     "density "
+#endif
+#if XCHAL_HAVE_BOOLEANS
+		     "boolean "
+#endif
+#if XCHAL_HAVE_LOOPS
+		     "loop "
+#endif
+#if XCHAL_HAVE_NSA
+		     "nsa "
+#endif
+#if XCHAL_HAVE_MINMAX
+		     "minmax "
+#endif
+#if XCHAL_HAVE_SEXT
+		     "sext "
+#endif
+#if XCHAL_HAVE_CLAMPS
+		     "clamps "
+#endif
+#if XCHAL_HAVE_MAC16
+		     "mac16 "
+#endif
+#if XCHAL_HAVE_MUL16
+		     "mul16 "
+#endif
+#if XCHAL_HAVE_MUL32
+		     "mul32 "
+#endif
+#if XCHAL_HAVE_MUL32_HIGH
+		     "mul32h "
+#endif
+#if XCHAL_HAVE_FP
+		     "fpu "
+#endif
+		     "\n");
+
+	/* Registers. */
+	seq_printf(f,"physical aregs\t: %d\n"
+		     "misc regs\t: %d\n"
+		     "ibreak\t\t: %d\n"
+		     "dbreak\t\t: %d\n",
+		     XCHAL_NUM_AREGS,
+		     XCHAL_NUM_MISC_REGS,
+		     XCHAL_NUM_IBREAK,
+		     XCHAL_NUM_DBREAK);
+
+
+	/* Interrupt. */
+	seq_printf(f,"num ints\t: %d\n"
+		     "ext ints\t: %d\n"
+		     "int levels\t: %d\n"
+		     "timers\t\t: %d\n"
+		     "debug level\t: %d\n",
+		     XCHAL_NUM_INTERRUPTS,
+		     XCHAL_NUM_EXTINTERRUPTS,
+		     XCHAL_NUM_INTLEVELS,
+		     XCHAL_NUM_TIMERS,
+		     XCHAL_DEBUGLEVEL);
+
+	/* Coprocessors */
+#if XCHAL_HAVE_CP
+	seq_printf(f, "coprocessors\t: %d\n", XCHAL_CP_NUM);
+#else
+	seq_printf(f, "coprocessors\t: none\n");
+#endif
+
+	/* {I,D}{RAM,ROM} and XLMI */
+	seq_printf(f,"inst ROMs\t: %d\n"
+		     "inst RAMs\t: %d\n"
+		     "data ROMs\t: %d\n"
+		     "data RAMs\t: %d\n"
+		     "XLMI ports\t: %d\n",
+		     XCHAL_NUM_IROM,
+		     XCHAL_NUM_IRAM,
+		     XCHAL_NUM_DROM,
+		     XCHAL_NUM_DRAM,
+		     XCHAL_NUM_XLMI);
+
+	/* Cache */
+	seq_printf(f,"icache line size: %d\n"
+		     "icache ways\t: %d\n"
+		     "icache size\t: %d\n"
+		     "icache flags\t: "
+#if XCHAL_ICACHE_LINE_LOCKABLE
+		     "lock"
+#endif
+		     "\n"
+		     "dcache line size: %d\n"
+		     "dcache ways\t: %d\n"
+		     "dcache size\t: %d\n"
+		     "dcache flags\t: "
+#if XCHAL_DCACHE_IS_WRITEBACK
+		     "writeback"
+#endif
+#if XCHAL_DCACHE_LINE_LOCKABLE
+		     "lock"
+#endif
+		     "\n",
+		     XCHAL_ICACHE_LINESIZE,
+		     XCHAL_ICACHE_WAYS,
+		     XCHAL_ICACHE_SIZE,
+		     XCHAL_DCACHE_LINESIZE,
+		     XCHAL_DCACHE_WAYS,
+		     XCHAL_DCACHE_SIZE);
+
+	/* MMU */
+	seq_printf(f,"ASID bits\t: %d\n"
+		     "ASID invalid\t: %d\n"
+		     "ASID kernel\t: %d\n"
+		     "rings\t\t: %d\n"
+		     "itlb ways\t: %d\n"
+		     "itlb AR ways\t: %d\n"
+		     "dtlb ways\t: %d\n"
+		     "dtlb AR ways\t: %d\n",
+		     XCHAL_MMU_ASID_BITS,
+		     XCHAL_MMU_ASID_INVALID,
+		     XCHAL_MMU_ASID_KERNEL,
+		     XCHAL_MMU_RINGS,
+		     XCHAL_ITLB_WAYS,
+		     XCHAL_ITLB_ARF_WAYS,
+		     XCHAL_DTLB_WAYS,
+		     XCHAL_DTLB_ARF_WAYS);
+
+	return 0;
+}
+
+/*
+ * We show only CPU #0 info.
+ */
+static void *
+c_start(struct seq_file *f, loff_t *pos)
+{
+	return (void *) ((*pos == 0) ? (void *)1 : NULL);
+}
+
+static void *
+c_next(struct seq_file *f, void *v, loff_t *pos)
+{
+	return NULL;
+}
+
+static void
+c_stop(struct seq_file *f, void *v)
+{
+}
+
+struct seq_operations cpuinfo_op =
+{
+	start:  c_start,
+	next:   c_next,
+	stop:   c_stop,
+	show:   c_show
+};
+
+#endif /* CONFIG_PROC_FS */
+