Initial import

1 files changed, 344 insertions, 0 deletions

diff --git a/arch/mips/sibyte/common/cfe.c b/arch/mips/sibyte/common/cfe.c
new file mode 100644
index 000000000..c1a11a11d
--- /dev/null
+++ b/arch/mips/sibyte/common/cfe.c
@@ -0,0 +1,344 @@
+/*
+ * Copyright (C) 2000, 2001, 2002, 2003 Broadcom Corporation
+ *
+ * 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 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., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
+ */
+
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/linkage.h>
+#include <linux/mm.h>
+#include <linux/blkdev.h>
+#include <linux/bootmem.h>
+#include <linux/pm.h>
+#include <linux/smp.h>
+
+#include <asm/bootinfo.h>
+#include <asm/reboot.h>
+#include <asm/sibyte/board.h>
+#include <asm/smp-ops.h>
+
+#include <asm/fw/cfe/cfe_api.h>
+#include <asm/fw/cfe/cfe_error.h>
+
+/* Max ram addressable in 32-bit segments */
+#ifdef CONFIG_64BIT
+#define MAX_RAM_SIZE (~0ULL)
+#else
+#ifdef CONFIG_HIGHMEM
+#ifdef CONFIG_PHYS_ADDR_T_64BIT
+#define MAX_RAM_SIZE (~0ULL)
+#else
+#define MAX_RAM_SIZE (0xffffffffULL)
+#endif
+#else
+#define MAX_RAM_SIZE (0x1fffffffULL)
+#endif
+#endif
+
+#define SIBYTE_MAX_MEM_REGIONS 8
+phys_addr_t board_mem_region_addrs[SIBYTE_MAX_MEM_REGIONS];
+phys_addr_t board_mem_region_sizes[SIBYTE_MAX_MEM_REGIONS];
+unsigned int board_mem_region_count;
+
+int cfe_cons_handle;
+
+#ifdef CONFIG_BLK_DEV_INITRD
+extern unsigned long initrd_start, initrd_end;
+#endif
+
+static void __noreturn cfe_linux_exit(void *arg)
+{
+	int warm = *(int *)arg;
+
+	if (smp_processor_id()) {
+		static int reboot_smp;
+
+		/* Don't repeat the process from another CPU */
+		if (!reboot_smp) {
+			/* Get CPU 0 to do the cfe_exit */
+			reboot_smp = 1;
+			smp_call_function(cfe_linux_exit, arg, 0);
+		}
+	} else {
+		printk("Passing control back to CFE...\n");
+		cfe_exit(warm, 0);
+		printk("cfe_exit returned??\n");
+	}
+	while (1);
+}
+
+static void __noreturn cfe_linux_restart(char *command)
+{
+	static const int zero;
+
+	cfe_linux_exit((void *)&zero);
+}
+
+static void __noreturn cfe_linux_halt(void)
+{
+	static const int one = 1;
+
+	cfe_linux_exit((void *)&one);
+}
+
+static __init void prom_meminit(void)
+{
+	u64 addr, size, type; /* regardless of PHYS_ADDR_T_64BIT */
+	int mem_flags = 0;
+	unsigned int idx;
+	int rd_flag;
+#ifdef CONFIG_BLK_DEV_INITRD
+	unsigned long initrd_pstart;
+	unsigned long initrd_pend;
+
+	initrd_pstart = CPHYSADDR(initrd_start);
+	initrd_pend = CPHYSADDR(initrd_end);
+	if (initrd_start &&
+	    ((initrd_pstart > MAX_RAM_SIZE)
+	     || (initrd_pend > MAX_RAM_SIZE))) {
+		panic("initrd out of addressable memory");
+	}
+
+#endif /* INITRD */
+
+	for (idx = 0; cfe_enummem(idx, mem_flags, &addr, &size, &type) != CFE_ERR_NOMORE;
+	     idx++) {
+		rd_flag = 0;
+		if (type == CFE_MI_AVAILABLE) {
+			/*
+			 * See if this block contains (any portion of) the
+			 * ramdisk
+			 */
+#ifdef CONFIG_BLK_DEV_INITRD
+			if (initrd_start) {
+				if ((initrd_pstart > addr) &&
+				    (initrd_pstart < (addr + size))) {
+					add_memory_region(addr,
+							  initrd_pstart - addr,
+							  BOOT_MEM_RAM);
+					rd_flag = 1;
+				}
+				if ((initrd_pend > addr) &&
+				    (initrd_pend < (addr + size))) {
+					add_memory_region(initrd_pend,
+						(addr + size) - initrd_pend,
+						 BOOT_MEM_RAM);
+					rd_flag = 1;
+				}
+			}
+#endif
+			if (!rd_flag) {
+				if (addr > MAX_RAM_SIZE)
+					continue;
+				if (addr+size > MAX_RAM_SIZE)
+					size = MAX_RAM_SIZE - (addr+size) + 1;
+				/*
+				 * memcpy/__copy_user prefetch, which
+				 * will cause a bus error for
+				 * KSEG/KUSEG addrs not backed by RAM.
+				 * Hence, reserve some padding for the
+				 * prefetch distance.
+				 */
+				if (size > 512)
+					size -= 512;
+				add_memory_region(addr, size, BOOT_MEM_RAM);
+			}
+			board_mem_region_addrs[board_mem_region_count] = addr;
+			board_mem_region_sizes[board_mem_region_count] = size;
+			board_mem_region_count++;
+			if (board_mem_region_count ==
+			    SIBYTE_MAX_MEM_REGIONS) {
+				/*
+				 * Too many regions.  Need to configure more
+				 */
+				while(1);
+			}
+		}
+	}
+#ifdef CONFIG_BLK_DEV_INITRD
+	if (initrd_start) {
+		add_memory_region(initrd_pstart, initrd_pend - initrd_pstart,
+				  BOOT_MEM_RESERVED);
+	}
+#endif
+}
+
+#ifdef CONFIG_BLK_DEV_INITRD
+static int __init initrd_setup(char *str)
+{
+	char rdarg[64];
+	int idx;
+	char *tmp, *endptr;
+	unsigned long initrd_size;
+
+	/* Make a copy of the initrd argument so we can smash it up here */
+	for (idx = 0; idx < sizeof(rdarg)-1; idx++) {
+		if (!str[idx] || (str[idx] == ' ')) break;
+		rdarg[idx] = str[idx];
+	}
+
+	rdarg[idx] = 0;
+	str = rdarg;
+
+	/*
+	 *Initrd location comes in the form "<hex size of ramdisk in bytes>@<location in memory>"
+	 *  e.g. initrd=3abfd@80010000.	 This is set up by the loader.
+	 */
+	for (tmp = str; *tmp != '@'; tmp++) {
+		if (!*tmp) {
+			goto fail;
+		}
+	}
+	*tmp = 0;
+	tmp++;
+	if (!*tmp) {
+		goto fail;
+	}
+	initrd_size = simple_strtoul(str, &endptr, 16);
+	if (*endptr) {
+		*(tmp-1) = '@';
+		goto fail;
+	}
+	*(tmp-1) = '@';
+	initrd_start = simple_strtoul(tmp, &endptr, 16);
+	if (*endptr) {
+		goto fail;
+	}
+	initrd_end = initrd_start + initrd_size;
+	printk("Found initrd of %lx@%lx\n", initrd_size, initrd_start);
+	return 1;
+ fail:
+	printk("Bad initrd argument.  Disabling initrd\n");
+	initrd_start = 0;
+	initrd_end = 0;
+	return 1;
+}
+
+#endif
+
+extern struct plat_smp_ops sb_smp_ops;
+extern struct plat_smp_ops bcm1480_smp_ops;
+
+/*
+ * prom_init is called just after the cpu type is determined, from setup_arch()
+ */
+void __init prom_init(void)
+{
+	uint64_t cfe_ept, cfe_handle;
+	unsigned int cfe_eptseal;
+	int argc = fw_arg0;
+	char **envp = (char **) fw_arg2;
+	int *prom_vec = (int *) fw_arg3;
+
+	_machine_restart   = cfe_linux_restart;
+	_machine_halt	   = cfe_linux_halt;
+	pm_power_off = cfe_linux_halt;
+
+	/*
+	 * Check if a loader was used; if NOT, the 4 arguments are
+	 * what CFE gives us (handle, 0, EPT and EPTSEAL)
+	 */
+	if (argc < 0) {
+		cfe_handle = (uint64_t)(long)argc;
+		cfe_ept = (long)envp;
+		cfe_eptseal = (uint32_t)(unsigned long)prom_vec;
+	} else {
+		if ((int32_t)(long)prom_vec < 0) {
+			/*
+			 * Old loader; all it gives us is the handle,
+			 * so use the "known" entrypoint and assume
+			 * the seal.
+			 */
+			cfe_handle = (uint64_t)(long)prom_vec;
+			cfe_ept = (uint64_t)((int32_t)0x9fc00500);
+			cfe_eptseal = CFE_EPTSEAL;
+		} else {
+			/*
+			 * Newer loaders bundle the handle/ept/eptseal
+			 * Note: prom_vec is in the loader's useg
+			 * which is still alive in the TLB.
+			 */
+			cfe_handle = (uint64_t)((int32_t *)prom_vec)[0];
+			cfe_ept = (uint64_t)((int32_t *)prom_vec)[2];
+			cfe_eptseal = (unsigned int)((uint32_t *)prom_vec)[3];
+		}
+	}
+	if (cfe_eptseal != CFE_EPTSEAL) {
+		/* too early for panic to do any good */
+		printk("CFE's entrypoint seal doesn't match. Spinning.");
+		while (1) ;
+	}
+	cfe_init(cfe_handle, cfe_ept);
+	/*
+	 * Get the handle for (at least) prom_putchar, possibly for
+	 * boot console
+	 */
+	cfe_cons_handle = cfe_getstdhandle(CFE_STDHANDLE_CONSOLE);
+	if (cfe_getenv("LINUX_CMDLINE", arcs_cmdline, COMMAND_LINE_SIZE) < 0) {
+		if (argc >= 0) {
+			/* The loader should have set the command line */
+			/* too early for panic to do any good */
+			printk("LINUX_CMDLINE not defined in cfe.");
+			while (1) ;
+		}
+	}
+
+#ifdef CONFIG_BLK_DEV_INITRD
+	{
+		char *ptr;
+		/* Need to find out early whether we've got an initrd.	So scan
+		   the list looking now */
+		for (ptr = arcs_cmdline; *ptr; ptr++) {
+			while (*ptr == ' ') {
+				ptr++;
+			}
+			if (!strncmp(ptr, "initrd=", 7)) {
+				initrd_setup(ptr+7);
+				break;
+			} else {
+				while (*ptr && (*ptr != ' ')) {
+					ptr++;
+				}
+			}
+		}
+	}
+#endif /* CONFIG_BLK_DEV_INITRD */
+
+	/* Not sure this is needed, but it's the safe way. */
+	arcs_cmdline[COMMAND_LINE_SIZE-1] = 0;
+
+	prom_meminit();
+
+#if defined(CONFIG_SIBYTE_BCM112X) || defined(CONFIG_SIBYTE_SB1250)
+	register_smp_ops(&sb_smp_ops);
+#endif
+#if defined(CONFIG_SIBYTE_BCM1x55) || defined(CONFIG_SIBYTE_BCM1x80)
+	register_smp_ops(&bcm1480_smp_ops);
+#endif
+}
+
+void __init prom_free_prom_memory(void)
+{
+	/* Not sure what I'm supposed to do here.  Nothing, I think */
+}
+
+void prom_putchar(char c)
+{
+	int ret;
+
+	while ((ret = cfe_write(cfe_cons_handle, &c, 1)) == 0)
+		;
+}