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-rw-r--r--arch/mips/sibyte/common/cfe.c330
1 files changed, 330 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..89f7fca45
--- /dev/null
+++ b/arch/mips/sibyte/common/cfe.c
@@ -0,0 +1,330 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Copyright (C) 2000, 2001, 2002, 2003 Broadcom Corporation
+ */
+
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/linkage.h>
+#include <linux/mm.h>
+#include <linux/blkdev.h>
+#include <linux/memblock.h>
+#include <linux/pm.h>
+#include <linux/smp.h>
+
+#include <asm/bootinfo.h>
+#include <asm/reboot.h>
+#include <asm/setup.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))) {
+ memblock_add(addr,
+ initrd_pstart - addr);
+ rd_flag = 1;
+ }
+ if ((initrd_pend > addr) &&
+ (initrd_pend < (addr + size))) {
+ memblock_add(initrd_pend,
+ (addr + size) - initrd_pend);
+ 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;
+ memblock_add(addr, size);
+ }
+ 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) {
+ memblock_add(initrd_pstart, initrd_pend - initrd_pstart);
+ memblock_reserve(initrd_pstart, initrd_pend - initrd_pstart);
+ }
+#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 const struct plat_smp_ops sb_smp_ops;
+extern const 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)
+ ;
+}
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