Commit a575b807 authored by Paul Mackerras's avatar Paul Mackerras
Browse files

powerpc: Run on old powermacs. 



Old powermacs have a number of differences from current machines:
- there is no interrupt tree in the device tree, just interrupt
  or AAPL,interrupt properties
- the chosen node in the device tree is called /chosen@0
- the OF claim method doesn't map the memory, so we have to do
  an explicit map call as well
- there is no /chosen/cpu property on SMP machines
- the NVRAM isn't structured as a set of partitions.

This adapts the merged powermac support code to cope with these
issues.

Signed-off-by: default avatarPaul Mackerras <paulus@samba.org>
parent 96c44507

arch/powerpc/kernel/prom.c

+35 −1
Original line number Diff line number Diff line
@@ -309,6 +309,37 @@ static int __devinit finish_node_interrupts(struct device_node *np, 
	unsigned int *irq, virq;

	struct device_node *ic;



	if (num_interrupt_controllers == 0) {

		/*

		 * Old machines just have a list of interrupt numbers

		 * and no interrupt-controller nodes.

		 */

		ints = (unsigned int *) get_property(np, "AAPL,interrupts",

						     &intlen);

		/* XXX old interpret_pci_props looked in parent too */

		/* XXX old interpret_macio_props looked for interrupts

		   before AAPL,interrupts */

		if (ints == NULL)

			ints = (unsigned int *) get_property(np, "interrupts",

							     &intlen);

		if (ints == NULL)

			return 0;



		np->n_intrs = intlen / sizeof(unsigned int);

		np->intrs = prom_alloc(np->n_intrs * sizeof(np->intrs[0]),

				       mem_start);

		if (!np->intrs)

			return -ENOMEM;

		if (measure_only)

			return 0;



		for (i = 0; i < np->n_intrs; ++i) {

			np->intrs[i].line = *ints++;

			np->intrs[i].sense = 1;

		}

		return 0;

	}



	ints = (unsigned int *) get_property(np, "interrupts", &intlen);

	if (ints == NULL)

		return 0;
@@ -1024,6 +1055,8 @@ void __init unflatten_device_tree(void) 


	/* Get pointer to OF "/chosen" node for use everywhere */

	of_chosen = of_find_node_by_path("/chosen");

	if (of_chosen == NULL)

		of_chosen = of_find_node_by_path("/chosen@0");



	/* Retreive command line */

	if (of_chosen != NULL) {
@@ -1123,7 +1156,8 @@ static int __init early_init_dt_scan_chosen(unsigned long node, 


	DBG("search \"chosen\", depth: %d, uname: %s\n", depth, uname);



	if (depth != 1 || strcmp(uname, "chosen") != 0)

	if (depth != 1 ||

	    (strcmp(uname, "chosen") != 0 && strcmp(uname, "chosen@0") != 0))

		return 0;



	/* get platform type */

arch/powerpc/kernel/prom_init.c

+63 −24
Original line number Diff line number Diff line
@@ -132,6 +132,7 @@ struct prom_t { 
	ihandle chosen;

	int cpu;

	ihandle stdout;

	ihandle mmumap;

};



struct mem_map_entry {
@@ -274,14 +275,6 @@ static int __init call_prom_ret(const char *service, int nargs, int nret, 
}





static unsigned int __init prom_claim(unsigned long virt, unsigned long size,

				unsigned long align)

{

	return (unsigned int)call_prom("claim", 3, 1,

				       (prom_arg_t)virt, (prom_arg_t)size,

				       (prom_arg_t)align);

}



static void __init prom_print(const char *msg)

{

	const char *p, *q;
@@ -363,6 +356,21 @@ static void __init prom_printf(const char *format, ...) 
}





static unsigned int __init prom_claim(unsigned long virt, unsigned long size,

				unsigned long align)

{

	int ret;

	struct prom_t *_prom = &RELOC(prom);



	ret = call_prom("claim", 3, 1, (prom_arg_t)virt, (prom_arg_t)size,

			(prom_arg_t)align);

	if (ret != -1 && _prom->mmumap != 0)

		/* old pmacs need us to map as well */

		call_prom("call-method", 6, 1,

			  ADDR("map"), _prom->mmumap, 0, size, virt, virt);

	return ret;

}



static void __init __attribute__((noreturn)) prom_panic(const char *reason)

{

#ifdef CONFIG_PPC64
@@ -1323,7 +1331,37 @@ static void __init prom_init_client_services(unsigned long pp) 
	_prom->root = call_prom("finddevice", 1, 1, ADDR("/"));

	if (!PHANDLE_VALID(_prom->root))

		prom_panic("cannot find device tree root"); /* msg won't be printed :( */



	_prom->mmumap = 0;

}



#ifdef CONFIG_PPC32

/*

 * For really old powermacs, we need to map things we claim.

 * For that, we need the ihandle of the mmu.

 */

static void __init prom_find_mmu(void)

{

	struct prom_t *_prom = &RELOC(prom);

	phandle oprom;

	char version[64];



	oprom = call_prom("finddevice", 1, 1, ADDR("/openprom"));

	if (!PHANDLE_VALID(oprom))

		return;

	if (prom_getprop(oprom, "model", version, sizeof(version)) <= 0)

		return;

	version[sizeof(version) - 1] = 0;

	prom_printf("OF version is '%s'\n", version);

	/* XXX might need to add other versions here */

	if (strcmp(version, "Open Firmware, 1.0.5") != 0)

		return;

	prom_getprop(_prom->chosen, "mmu", &_prom->mmumap,

		     sizeof(_prom->mmumap));

}

#else

#define prom_find_mmu()

#endif



static void __init prom_init_stdout(void)

{
@@ -1379,7 +1417,7 @@ static int __init prom_find_machine_type(void) 
			if (sl == 0)

				break;

			if (strstr(p, RELOC("Power Macintosh")) ||

			    strstr(p, RELOC("MacRISC4")))

			    strstr(p, RELOC("MacRISC")))

				return PLATFORM_POWERMAC;

#ifdef CONFIG_PPC64

			if (strstr(p, RELOC("Momentum,Maple")))
@@ -1618,22 +1656,17 @@ static void __init scan_dt_build_struct(phandle node, unsigned long *mem_start, 
		namep[l] = '\0';



		/* Fixup an Apple bug where they have bogus \0 chars in the

		 * middle of the path in some properties

		 * middle of the path in some properties, and extract

		 * the unit name (everything after the last '/').

		 */

		for (p = namep, ep = namep + l; p < ep; p++)

			if (*p == '\0') {

				memmove(p, p+1, ep - p);

				ep--; l--; p--;

			}



		/* now try to extract the unit name in that mess */

		for (p = namep, lp = NULL; *p; p++)

		for (lp = p = namep, ep = namep + l; p < ep; p++) {

			if (*p == '/')

				lp = p + 1;

		if (lp != NULL)

			memmove(namep, lp, strlen(lp) + 1);

		*mem_start = _ALIGN(((unsigned long) namep) +

				    strlen(namep) + 1, 4);

				lp = namep;

			else if (*p != 0)

				*lp++ = *p;

		}

		*lp = 0;

		*mem_start = _ALIGN((unsigned long)lp + 1, 4);

	}



	/* get it again for debugging */
@@ -1858,8 +1891,9 @@ static void __init prom_find_boot_cpu(void) 
	ihandle prom_cpu;

	phandle cpu_pkg;



	_prom->cpu = 0;

	if (prom_getprop(_prom->chosen, "cpu", &prom_cpu, sizeof(prom_cpu)) <= 0)

		prom_panic("cannot find boot cpu");

		return;



	cpu_pkg = call_prom("instance-to-package", 1, 1, prom_cpu);
@@ -1933,6 +1967,11 @@ unsigned long __init prom_init(unsigned long r3, unsigned long r4, 
	 */

	prom_init_stdout();



	/*

	 * See if this OF is old enough that we need to do explicit maps

	 */

	prom_find_mmu();



	/*

	 * Check for an initrd

	 */

arch/powerpc/platforms/powermac/setup.c

+8 −2
Original line number Diff line number Diff line
@@ -225,7 +225,7 @@ int find_via_pmu(void) 
		return 0;

	printk("WARNING ! Your machine is PMU-based but your kernel\n");

	printk("          wasn't compiled with CONFIG_ADB_PMU option !\n");

	return;

	return 0;

}

#endif
@@ -293,7 +293,7 @@ static void __init l2cr_init(void) 


void __init pmac_setup_arch(void)

{

	struct device_node *cpu;

	struct device_node *cpu, *ic;

	int *fp;

	unsigned long pvr;
@@ -319,6 +319,12 @@ void __init pmac_setup_arch(void) 
		of_node_put(cpu);

	}



	/* See if newworld or oldworld */

	ic = of_find_node_by_name(NULL, "interrupt-controller");

	pmac_newworld = (ic != NULL);

	if (ic)

		of_node_put(ic);



	/* Lookup PCI hosts */

	pmac_pci_init();

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