Commit 6e35d5da authored by Benjamin Herrenschmidt's avatar Benjamin Herrenschmidt
Browse files

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: default avatarBenjamin Herrenschmidt <benh@kernel.crashing.org>
parent 14a43e69

arch/powerpc/kernel/prom_init.c

+117 −19
Original line number Diff line number Diff line
@@ -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);
@@ -2200,9 +2281,15 @@ 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. */

	/* 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"
@@ -2214,6 +2301,7 @@ static void __init scan_dt_build_struct(phandle node, unsigned long *mem_start, 
			valp = make_room(mem_start, mem_end, 4, 4);

			*(u32 *)valp = node;

		}

	}



	/* do all our children */

	child = call_prom("child", 1, 1, node);
@@ -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;

}

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