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: Michael Ellerman <michael@ellerman.id.au>
Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au>

3 files changed, 57 insertions, 153 deletions

diff --git a/arch/ppc64/kernel/iSeries_setup.c b/arch/ppc64/kernel/iSeries_setup.c
index 4895f674a4ba..cadfc623a838 100644
--- a/arch/ppc64/kernel/iSeries_setup.c
+++ b/arch/ppc64/kernel/iSeries_setup.c
@@ -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 */
@@ -344,12 +335,6 @@ static void __init iSeries_init_early(void)
         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
          */
         hpte_init_iSeries();
@@ -581,47 +566,6 @@ static void __init build_iSeries_Memory_Map(void)
 }
 
 /*
- * 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.
  */
 static void __init iSeries_setup_arch(void)
@@ -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);
diff --git a/arch/ppc64/kernel/iSeries_smp.c b/arch/ppc64/kernel/iSeries_smp.c
index f74386e31638..f982e5b805f4 100644
--- a/arch/ppc64/kernel/iSeries_smp.c
+++ b/arch/ppc64/kernel/iSeries_smp.c
@@ -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();
 }
-
diff --git a/arch/ppc64/kernel/time.c b/arch/ppc64/kernel/time.c
index fb4bf0ad8f32..7f63755eddfd 100644
--- a/arch/ppc64/kernel/time.c
+++ b/arch/ppc64/kernel/time.c
@@ -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;