From 6e35d5dac0c83ebb616ff3b9c2d6155c9a9ccb86 Mon Sep 17 00:00:00 2001 From: Benjamin Herrenschmidt Date: Mon, 19 Sep 2011 18:28:01 +0000 Subject: [PATCH] powerpc/powernv: Add support for instanciating OPAL v2 from Open Firmware OPAL v2 is instantiated in a way similar to RTAS using Open Firmware client interface calls, and the resulting address and entry point are put in the device-tree Signed-off-by: Benjamin Herrenschmidt --- arch/powerpc/kernel/prom_init.c | 136 +++++++++++++++++++++++++++----- 1 file changed, 117 insertions(+), 19 deletions(-) diff --git a/arch/powerpc/kernel/prom_init.c b/arch/powerpc/kernel/prom_init.c index e3f390427216..e96f5d0d2c78 100644 --- a/arch/powerpc/kernel/prom_init.c +++ b/arch/powerpc/kernel/prom_init.c @@ -140,7 +140,9 @@ struct mem_map_entry { typedef u32 cell_t; -extern void __start(unsigned long r3, unsigned long r4, unsigned long r5); +extern void __start(unsigned long r3, unsigned long r4, unsigned long r5, + unsigned long r6, unsigned long r7, unsigned long r8, + unsigned long r9); #ifdef CONFIG_PPC64 extern int enter_prom(struct prom_args *args, unsigned long entry); @@ -1293,6 +1295,11 @@ static int __initdata prom_rtas_start_cpu; static u64 __initdata prom_rtas_data; static u64 __initdata prom_rtas_entry; +#ifdef CONFIG_PPC_EARLY_DEBUG_OPAL +static u64 __initdata prom_opal_base; +static u64 __initdata prom_opal_entry; +#endif + /* XXX Don't change this structure without updating opal-takeover.S */ static struct opal_secondary_data { s64 ack; /* 0 */ @@ -1468,6 +1475,76 @@ static void prom_opal_takeover(void) for (;;) opal_do_takeover(args); } + +/* + * Allocate room for and instantiate OPAL + */ +static void __init prom_instantiate_opal(void) +{ + phandle opal_node; + ihandle opal_inst; + u64 base, entry; + u64 size = 0, align = 0x10000; + u32 rets[2]; + + prom_debug("prom_instantiate_opal: start...\n"); + + opal_node = call_prom("finddevice", 1, 1, ADDR("/ibm,opal")); + prom_debug("opal_node: %x\n", opal_node); + if (!PHANDLE_VALID(opal_node)) + return; + + prom_getprop(opal_node, "opal-runtime-size", &size, sizeof(size)); + if (size == 0) + return; + prom_getprop(opal_node, "opal-runtime-alignment", &align, + sizeof(align)); + + base = alloc_down(size, align, 0); + if (base == 0) { + prom_printf("OPAL allocation failed !\n"); + return; + } + + opal_inst = call_prom("open", 1, 1, ADDR("/ibm,opal")); + if (!IHANDLE_VALID(opal_inst)) { + prom_printf("opening opal package failed (%x)\n", opal_inst); + return; + } + + prom_printf("instantiating opal at 0x%x...", base); + + if (call_prom_ret("call-method", 4, 3, rets, + ADDR("load-opal-runtime"), + opal_inst, + base >> 32, base & 0xffffffff) != 0 + || (rets[0] == 0 && rets[1] == 0)) { + prom_printf(" failed\n"); + return; + } + entry = (((u64)rets[0]) << 32) | rets[1]; + + prom_printf(" done\n"); + + reserve_mem(base, size); + + prom_debug("opal base = 0x%x\n", base); + prom_debug("opal align = 0x%x\n", align); + prom_debug("opal entry = 0x%x\n", entry); + prom_debug("opal size = 0x%x\n", (long)size); + + prom_setprop(opal_node, "/ibm,opal", "opal-base-address", + &base, sizeof(base)); + prom_setprop(opal_node, "/ibm,opal", "opal-entry-address", + &entry, sizeof(entry)); + +#ifdef CONFIG_PPC_EARLY_DEBUG_OPAL + RELOC(prom_opal_base) = base; + RELOC(prom_opal_entry) = entry; +#endif + prom_debug("prom_instantiate_opal: end...\n"); +} + #endif /* CONFIG_PPC_POWERNV */ /* @@ -1863,7 +1940,7 @@ static int __init prom_find_machine_type(void) int x; #endif - /* Look for a PowerMac */ + /* Look for a PowerMac or a Cell */ len = prom_getprop(_prom->root, "compatible", compat, sizeof(compat)-1); if (len > 0) { @@ -1889,7 +1966,11 @@ static int __init prom_find_machine_type(void) } } #ifdef CONFIG_PPC64 - /* If not a mac, try to figure out if it's an IBM pSeries or any other + /* Try to detect OPAL */ + if (PHANDLE_VALID(call_prom("finddevice", 1, 1, ADDR("/ibm,opal")))) + return PLATFORM_OPAL; + + /* Try to figure out if it's an IBM pSeries or any other * PAPR compliant platform. We assume it is if : * - /device_type is "chrp" (please, do NOT use that for future * non-IBM designs ! @@ -2116,7 +2197,7 @@ static void __init scan_dt_build_struct(phandle node, unsigned long *mem_start, unsigned long soff; unsigned char *valp; static char pname[MAX_PROPERTY_NAME]; - int l, room; + int l, room, has_phandle = 0; dt_push_token(OF_DT_BEGIN_NODE, mem_start, mem_end); @@ -2200,19 +2281,26 @@ static void __init scan_dt_build_struct(phandle node, unsigned long *mem_start, valp = make_room(mem_start, mem_end, l, 4); call_prom("getprop", 4, 1, node, RELOC(pname), valp, l); *mem_start = _ALIGN(*mem_start, 4); + + if (!strcmp(RELOC(pname), RELOC("phandle"))) + has_phandle = 1; } - /* Add a "linux,phandle" property. */ - soff = dt_find_string(RELOC("linux,phandle")); - if (soff == 0) - prom_printf("WARNING: Can't find string index for" - " node %s\n", path); - else { - dt_push_token(OF_DT_PROP, mem_start, mem_end); - dt_push_token(4, mem_start, mem_end); - dt_push_token(soff, mem_start, mem_end); - valp = make_room(mem_start, mem_end, 4, 4); - *(u32 *)valp = node; + /* Add a "linux,phandle" property if no "phandle" property already + * existed (can happen with OPAL) + */ + if (!has_phandle) { + soff = dt_find_string(RELOC("linux,phandle")); + if (soff == 0) + prom_printf("WARNING: Can't find string index for" + " node %s\n", path); + else { + dt_push_token(OF_DT_PROP, mem_start, mem_end); + dt_push_token(4, mem_start, mem_end); + dt_push_token(soff, mem_start, mem_end); + valp = make_room(mem_start, mem_end, 4, 4); + *(u32 *)valp = node; + } } /* do all our children */ @@ -2746,6 +2834,7 @@ unsigned long __init prom_init(unsigned long r3, unsigned long r4, * between pSeries SMP and pSeries LPAR */ RELOC(of_platform) = prom_find_machine_type(); + prom_printf("Detected machine type: %x\n", RELOC(of_platform)); #ifndef CONFIG_RELOCATABLE /* Bail if this is a kdump kernel. */ @@ -2807,7 +2896,8 @@ unsigned long __init prom_init(unsigned long r3, unsigned long r4, * On non-powermacs, try to instantiate RTAS. PowerMacs don't * have a usable RTAS implementation. */ - if (RELOC(of_platform) != PLATFORM_POWERMAC) + if (RELOC(of_platform) != PLATFORM_POWERMAC && + RELOC(of_platform) != PLATFORM_OPAL) prom_instantiate_rtas(); #ifdef CONFIG_PPC_POWERNV @@ -2818,7 +2908,8 @@ unsigned long __init prom_init(unsigned long r3, unsigned long r4, prom_opal_hold_cpus(); prom_opal_takeover(); } - } + } else if (RELOC(of_platform) == PLATFORM_OPAL) + prom_instantiate_opal(); #endif /* @@ -2826,7 +2917,8 @@ unsigned long __init prom_init(unsigned long r3, unsigned long r4, * * PowerMacs use a different mechanism to spin CPUs */ - if (RELOC(of_platform) != PLATFORM_POWERMAC) + if (RELOC(of_platform) != PLATFORM_POWERMAC && + RELOC(of_platform) != PLATFORM_OPAL) prom_hold_cpus(); /* @@ -2894,7 +2986,13 @@ unsigned long __init prom_init(unsigned long r3, unsigned long r4, reloc_got2(-offset); #endif - __start(hdr, kbase, 0); +#ifdef CONFIG_PPC_EARLY_DEBUG_OPAL + /* OPAL early debug gets the OPAL base & entry in r8 and r9 */ + __start(hdr, kbase, 0, 0, 0, + RELOC(prom_opal_base), RELOC(prom_opal_entry)); +#else + __start(hdr, kbase, 0, 0, 0, 0, 0); +#endif return 0; } -- 2.39.5