Commit 95b29380 authored by Michael Ellerman's avatar Michael Ellerman Committed by Stephen Rothwell
Browse files

ppc64 iSeries: Define /cpus in iSeries device tree 



Add the /cpus node and nodes for each cpu, as well as cache size properties,
reg propery, "linux,boot-cpu", and timebase/clock frequency.

With those properties in place we can remove:

- setup_iSeries_cache_sizes()
- code in iSeries_setup_arch() to calculate timebase etc.
- iSeries_calibrate_decr()
- smp_iSeries_numProcs() and simplify smp_iSeries_probe()

Signed-off-by: default avatarMichael Ellerman <michael@ellerman.id.au>
Signed-off-by: default avatarStephen Rothwell <sfr@canb.auug.org.au>
parent 47db3603

arch/ppc64/kernel/iSeries_setup.c

+55 −123
Original line number Diff line number Diff line
@@ -74,7 +74,6 @@ extern void hvlog(char *fmt, ...); 
extern void ppcdbg_initialize(void);



static void build_iSeries_Memory_Map(void);

static void setup_iSeries_cache_sizes(void);

static int iseries_shared_idle(void);

static int iseries_dedicated_idle(void);

#ifdef CONFIG_PCI
@@ -84,14 +83,6 @@ static void iSeries_pci_final_fixup(void) { } 
#endif



/* Global Variables */

static unsigned long procFreqHz;

static unsigned long procFreqMhz;

static unsigned long procFreqMhzHundreths;



static unsigned long tbFreqHz;

static unsigned long tbFreqMhz;

static unsigned long tbFreqMhzHundreths;



int piranha_simulator;



extern int rd_size;		/* Defined in drivers/block/rd.c */
@@ -343,12 +334,6 @@ static void __init iSeries_init_early(void) 
	iSeries_recal_tb = get_tb();

	iSeries_recal_titan = HvCallXm_loadTod();



	/*

	 * Cache sizes must be initialized before hpte_init_iSeries is called

	 * as the later need them for flush_icache_range()

	 */

	setup_iSeries_cache_sizes();



	/*

	 * Initialize the hash table management pointers

	 */
@@ -580,47 +565,6 @@ static void __init build_iSeries_Memory_Map(void) 
	systemcfg->physicalMemorySize = chunk_to_addr(nextPhysChunk);

}



/*

 * Set up the variables that describe the cache line sizes

 * for this machine.

 */

static void __init setup_iSeries_cache_sizes(void)

{

	unsigned int i, n;

	unsigned int procIx = get_paca()->lppaca.dyn_hv_phys_proc_index;



	systemcfg->icache_size =

	ppc64_caches.isize = xIoHriProcessorVpd[procIx].xInstCacheSize * 1024;

	systemcfg->icache_line_size =

	ppc64_caches.iline_size =

		xIoHriProcessorVpd[procIx].xInstCacheOperandSize;

	systemcfg->dcache_size =

	ppc64_caches.dsize =

		xIoHriProcessorVpd[procIx].xDataL1CacheSizeKB * 1024;

	systemcfg->dcache_line_size =

	ppc64_caches.dline_size =

		xIoHriProcessorVpd[procIx].xDataCacheOperandSize;

	ppc64_caches.ilines_per_page = PAGE_SIZE / ppc64_caches.iline_size;

	ppc64_caches.dlines_per_page = PAGE_SIZE / ppc64_caches.dline_size;



	i = ppc64_caches.iline_size;

	n = 0;

	while ((i = (i / 2)))

		++n;

	ppc64_caches.log_iline_size = n;



	i = ppc64_caches.dline_size;

	n = 0;

	while ((i = (i / 2)))

		++n;

	ppc64_caches.log_dline_size = n;



	printk("D-cache line size = %d\n",

			(unsigned int)ppc64_caches.dline_size);

	printk("I-cache line size = %d\n",

			(unsigned int)ppc64_caches.iline_size);

}



/*

 * Document me.

 */
@@ -636,36 +580,14 @@ static void __init iSeries_setup_arch(void) 
		printk(KERN_INFO "Using dedicated idle loop\n");

	}



	/* Add an eye catcher and the systemcfg layout version number */

	strcpy(systemcfg->eye_catcher, "SYSTEMCFG:PPC64");

	systemcfg->version.major = SYSTEMCFG_MAJOR;

	systemcfg->version.minor = SYSTEMCFG_MINOR;



	/* Setup the Lp Event Queue */

	setup_hvlpevent_queue();



	/* Compute processor frequency */

	procFreqHz = ((1UL << 34) * 1000000) /

			xIoHriProcessorVpd[procIx].xProcFreq;

	procFreqMhz = procFreqHz / 1000000;

	procFreqMhzHundreths = (procFreqHz / 10000) - (procFreqMhz * 100);

	ppc_proc_freq = procFreqHz;



	/* Compute time base frequency */

	tbFreqHz = ((1UL << 32) * 1000000) /

		xIoHriProcessorVpd[procIx].xTimeBaseFreq;

	tbFreqMhz = tbFreqHz / 1000000;

	tbFreqMhzHundreths = (tbFreqHz / 10000) - (tbFreqMhz * 100);

	ppc_tb_freq = tbFreqHz;



	printk("Max  logical processors = %d\n",

			itVpdAreas.xSlicMaxLogicalProcs);

	printk("Max physical processors = %d\n",

			itVpdAreas.xSlicMaxPhysicalProcs);

	printk("Processor frequency = %lu.%02lu\n", procFreqMhz,

			procFreqMhzHundreths);

	printk("Time base frequency = %lu.%02lu\n", tbFreqMhz,

			tbFreqMhzHundreths);



	systemcfg->processor = xIoHriProcessorVpd[procIx].xPVR;

	printk("Processor version = %x\n", systemcfg->processor);

}
@@ -709,49 +631,6 @@ static void iSeries_halt(void) 
	mf_power_off();

}



/*

 * void __init iSeries_calibrate_decr()

 *

 * Description:

 *   This routine retrieves the internal processor frequency from the VPD,

 *   and sets up the kernel timer decrementer based on that value.

 *

 */

static void __init iSeries_calibrate_decr(void)

{

	unsigned long	cyclesPerUsec;

	struct div_result divres;



	/* Compute decrementer (and TB) frequency in cycles/sec */

	cyclesPerUsec = ppc_tb_freq / 1000000;



	/*

	 * Set the amount to refresh the decrementer by.  This

	 * is the number of decrementer ticks it takes for

	 * 1/HZ seconds.

	 */

	tb_ticks_per_jiffy = ppc_tb_freq / HZ;



#if 0

	/* TEST CODE FOR ADJTIME */

	tb_ticks_per_jiffy += tb_ticks_per_jiffy / 5000;

	/* END OF TEST CODE */

#endif



	/*

	 * tb_ticks_per_sec = freq; would give better accuracy

	 * but tb_ticks_per_sec = tb_ticks_per_jiffy*HZ; assures

	 * that jiffies (and xtime) will match the time returned

	 * by do_gettimeofday.

	 */

	tb_ticks_per_sec = tb_ticks_per_jiffy * HZ;

	tb_ticks_per_usec = cyclesPerUsec;

	tb_to_us = mulhwu_scale_factor(ppc_tb_freq, 1000000);

	div128_by_32(1024 * 1024, 0, tb_ticks_per_sec, &divres);

	tb_to_xs = divres.result_low;

	setup_default_decr();

}



static void __init iSeries_progress(char * st, unsigned short code)

{

	printk("Progress: [%04x] - %s\n", (unsigned)code, st);
@@ -901,7 +780,7 @@ struct machdep_calls __initdata iseries_md = { 
	.get_boot_time	= iSeries_get_boot_time,

	.set_rtc_time	= iSeries_set_rtc_time,

	.get_rtc_time	= iSeries_get_rtc_time,

	.calibrate_decr	= iSeries_calibrate_decr,

	.calibrate_decr	= generic_calibrate_decr,

	.progress	= iSeries_progress,

	.probe		= iseries_probe,

	/* XXX Implement enable_pmcs for iSeries */
@@ -1032,6 +911,57 @@ void dt_prop_empty(struct iseries_flat_dt *dt, char *name) 
	dt_prop(dt, name, NULL, 0);

}



void dt_cpus(struct iseries_flat_dt *dt)

{

	unsigned char buf[32];

	unsigned char *p;

	unsigned int i, index;

	struct IoHriProcessorVpd *d;



	/* yuck */

	snprintf(buf, 32, "PowerPC,%s", cur_cpu_spec->cpu_name);

	p = strchr(buf, ' ');

	if (!p) p = buf + strlen(buf);



	dt_start_node(dt, "cpus");

	dt_prop_u32(dt, "#address-cells", 1);

	dt_prop_u32(dt, "#size-cells", 0);



	for (i = 0; i < NR_CPUS; i++) {

		if (paca[i].lppaca.dyn_proc_status >= 2)

			continue;



		snprintf(p, 32 - (p - buf), "@%d", i);

		dt_start_node(dt, buf);



		dt_prop_str(dt, "device_type", "cpu");



		index = paca[i].lppaca.dyn_hv_phys_proc_index;

		d = &xIoHriProcessorVpd[index];



		dt_prop_u32(dt, "i-cache-size", d->xInstCacheSize * 1024);

		dt_prop_u32(dt, "i-cache-line-size", d->xInstCacheOperandSize);



		dt_prop_u32(dt, "d-cache-size", d->xDataL1CacheSizeKB * 1024);

		dt_prop_u32(dt, "d-cache-line-size", d->xDataCacheOperandSize);



		/* magic conversions to Hz copied from old code */

		dt_prop_u32(dt, "clock-frequency",

			((1UL << 34) * 1000000) / d->xProcFreq);

		dt_prop_u32(dt, "timebase-frequency",

			((1UL << 32) * 1000000) / d->xTimeBaseFreq);



		dt_prop_u32(dt, "reg", i);



		if (dt->header.boot_cpuid_phys == i)

			dt_prop_empty(dt, "linux,boot-cpu");



		dt_end_node(dt);

	}



	dt_end_node(dt);

}



void build_flat_dt(struct iseries_flat_dt *dt)

{

	u64 tmp[2];
@@ -1057,6 +987,8 @@ void build_flat_dt(struct iseries_flat_dt *dt) 
	dt_prop_u32(dt, "linux,platform", PLATFORM_ISERIES_LPAR);

	dt_end_node(dt);



	dt_cpus(dt);



	dt_end_node(dt);



	dt_push_u32(dt, OF_DT_END);

arch/ppc64/kernel/iSeries_smp.c

+1 −29
Original line number Diff line number Diff line
@@ -82,35 +82,9 @@ static void smp_iSeries_message_pass(int target, int msg) 
	}

}



static int smp_iSeries_numProcs(void)

{

	unsigned np, i;



	np = 0;

        for (i=0; i < NR_CPUS; ++i) {

                if (paca[i].lppaca.dyn_proc_status < 2) {

			cpu_set(i, cpu_possible_map);

			cpu_set(i, cpu_present_map);

			cpu_set(i, cpu_sibling_map[i]);

                        ++np;

                }

        }

	return np;

}



static int smp_iSeries_probe(void)

{

	unsigned i;

	unsigned np = 0;



	for (i=0; i < NR_CPUS; ++i) {

		if (paca[i].lppaca.dyn_proc_status < 2) {

			/*paca[i].active = 1;*/

			++np;

		}

	}



	return np;

	return cpus_weight(cpu_possible_map);

}



static void smp_iSeries_kick_cpu(int nr)
@@ -144,6 +118,4 @@ static struct smp_ops_t iSeries_smp_ops = { 
void __init smp_init_iSeries(void)

{

	smp_ops = &iSeries_smp_ops;

	systemcfg->processorCount	= smp_iSeries_numProcs();

}

arch/ppc64/kernel/time.c

+1 −1
Original line number Diff line number Diff line
@@ -465,7 +465,7 @@ int do_settimeofday(struct timespec *tv) 


EXPORT_SYMBOL(do_settimeofday);



#if defined(CONFIG_PPC_PSERIES) || defined(CONFIG_PPC_MAPLE) || defined(CONFIG_PPC_BPA)

#if defined(CONFIG_PPC_PSERIES) || defined(CONFIG_PPC_MAPLE) || defined(CONFIG_PPC_BPA) || defined(CONFIG_PPC_ISERIES)

void __init generic_calibrate_decr(void)

{

	struct device_node *cpu;

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