MIPS: Sibyte: Remove standalone kernel support

CFE is the only supported and used bootloader on the SiByte boards,
the standalone kernel support has been never used outside Broadcom.
Remove it and make the kernel use CFE by default.

Signed-off-by: Imre Kaloz <kaloz@openwrt.org>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

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 000000000000..eb5396cf81bb
--- /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_64BIT_PHYS_ADDR
+#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_t board_mem_region_addrs[SIBYTE_MAX_MEM_REGIONS];
+phys_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 64BIT_PHYS_ADDR */
+        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, CL_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[CL_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)
+                ;
+}