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Diffstat (limited to 'arch/powerpc/platforms/powermac/smp.c')
-rw-r--r--arch/powerpc/platforms/powermac/smp.c530
1 files changed, 340 insertions, 190 deletions
diff --git a/arch/powerpc/platforms/powermac/smp.c b/arch/powerpc/platforms/powermac/smp.c
index ccaa0534d60..e1f9443cc87 100644
--- a/arch/powerpc/platforms/powermac/smp.c
+++ b/arch/powerpc/platforms/powermac/smp.c
@@ -44,20 +44,33 @@
#include <asm/io.h>
#include <asm/prom.h>
#include <asm/smp.h>
-#include <asm/residual.h>
#include <asm/machdep.h>
#include <asm/pmac_feature.h>
#include <asm/time.h>
#include <asm/mpic.h>
#include <asm/cacheflush.h>
#include <asm/keylargo.h>
+#include <asm/pmac_low_i2c.h>
+
+#undef DEBUG
+
+#ifdef DEBUG
+#define DBG(fmt...) udbg_printf(fmt)
+#else
+#define DBG(fmt...)
+#endif
+
+extern void __secondary_start_pmac_0(void);
+
+#ifdef CONFIG_PPC32
+
+/* Sync flag for HW tb sync */
+static volatile int sec_tb_reset = 0;
/*
* Powersurge (old powermac SMP) support.
*/
-extern void __secondary_start_pmac_0(void);
-
/* Addresses for powersurge registers */
#define HAMMERHEAD_BASE 0xf8000000
#define HHEAD_CONFIG 0x90
@@ -106,47 +119,6 @@ static volatile u32 __iomem *psurge_start;
/* what sort of powersurge board we have */
static int psurge_type = PSURGE_NONE;
-/* L2 and L3 cache settings to pass from CPU0 to CPU1 */
-volatile static long int core99_l2_cache;
-volatile static long int core99_l3_cache;
-
-/* Timebase freeze GPIO */
-static unsigned int core99_tb_gpio;
-
-/* Sync flag for HW tb sync */
-static volatile int sec_tb_reset = 0;
-static unsigned int pri_tb_hi, pri_tb_lo;
-static unsigned int pri_tb_stamp;
-
-static void __devinit core99_init_caches(int cpu)
-{
- if (!cpu_has_feature(CPU_FTR_L2CR))
- return;
-
- if (cpu == 0) {
- core99_l2_cache = _get_L2CR();
- printk("CPU0: L2CR is %lx\n", core99_l2_cache);
- } else {
- printk("CPU%d: L2CR was %lx\n", cpu, _get_L2CR());
- _set_L2CR(0);
- _set_L2CR(core99_l2_cache);
- printk("CPU%d: L2CR set to %lx\n", cpu, core99_l2_cache);
- }
-
- if (!cpu_has_feature(CPU_FTR_L3CR))
- return;
-
- if (cpu == 0){
- core99_l3_cache = _get_L3CR();
- printk("CPU0: L3CR is %lx\n", core99_l3_cache);
- } else {
- printk("CPU%d: L3CR was %lx\n", cpu, _get_L3CR());
- _set_L3CR(0);
- _set_L3CR(core99_l3_cache);
- printk("CPU%d: L3CR set to %lx\n", cpu, core99_l3_cache);
- }
-}
-
/*
* Set and clear IPIs for powersurge.
*/
@@ -436,151 +408,188 @@ void __init smp_psurge_give_timebase(void)
/* Dummy implementation */
}
-static int __init smp_core99_probe(void)
-{
-#ifdef CONFIG_6xx
- extern int powersave_nap;
-#endif
- struct device_node *cpus, *firstcpu;
- int i, ncpus = 0, boot_cpu = -1;
- u32 *tbprop = NULL;
-
- if (ppc_md.progress) ppc_md.progress("smp_core99_probe", 0x345);
- cpus = firstcpu = find_type_devices("cpu");
- while(cpus != NULL) {
- u32 *regprop = (u32 *)get_property(cpus, "reg", NULL);
- char *stateprop = (char *)get_property(cpus, "state", NULL);
- if (regprop != NULL && stateprop != NULL &&
- !strncmp(stateprop, "running", 7))
- boot_cpu = *regprop;
- ++ncpus;
- cpus = cpus->next;
- }
- if (boot_cpu == -1)
- printk(KERN_WARNING "Couldn't detect boot CPU !\n");
- if (boot_cpu != 0)
- printk(KERN_WARNING "Boot CPU is %d, unsupported setup !\n", boot_cpu);
+/* PowerSurge-style Macs */
+struct smp_ops_t psurge_smp_ops = {
+ .message_pass = smp_psurge_message_pass,
+ .probe = smp_psurge_probe,
+ .kick_cpu = smp_psurge_kick_cpu,
+ .setup_cpu = smp_psurge_setup_cpu,
+ .give_timebase = smp_psurge_give_timebase,
+ .take_timebase = smp_psurge_take_timebase,
+};
+#endif /* CONFIG_PPC32 - actually powersurge support */
- if (machine_is_compatible("MacRISC4")) {
- extern struct smp_ops_t core99_smp_ops;
+#ifdef CONFIG_PPC64
+/*
+ * G5s enable/disable the timebase via an i2c-connected clock chip.
+ */
+static struct device_node *pmac_tb_clock_chip_host;
+static u8 pmac_tb_pulsar_addr;
+static void (*pmac_tb_freeze)(int freeze);
+static DEFINE_SPINLOCK(timebase_lock);
+static unsigned long timebase;
- core99_smp_ops.take_timebase = smp_generic_take_timebase;
- core99_smp_ops.give_timebase = smp_generic_give_timebase;
- } else {
- if (firstcpu != NULL)
- tbprop = (u32 *)get_property(firstcpu, "timebase-enable", NULL);
- if (tbprop)
- core99_tb_gpio = *tbprop;
- else
- core99_tb_gpio = KL_GPIO_TB_ENABLE;
- }
+static void smp_core99_cypress_tb_freeze(int freeze)
+{
+ u8 data;
+ int rc;
- if (ncpus > 1) {
- mpic_request_ipis();
- for (i = 1; i < ncpus; ++i)
- smp_hw_index[i] = i;
-#ifdef CONFIG_6xx
- powersave_nap = 0;
-#endif
- core99_init_caches(0);
+ /* Strangely, the device-tree says address is 0xd2, but darwin
+ * accesses 0xd0 ...
+ */
+ pmac_low_i2c_setmode(pmac_tb_clock_chip_host, pmac_low_i2c_mode_combined);
+ rc = pmac_low_i2c_xfer(pmac_tb_clock_chip_host,
+ 0xd0 | pmac_low_i2c_read,
+ 0x81, &data, 1);
+ if (rc != 0)
+ goto bail;
+
+ data = (data & 0xf3) | (freeze ? 0x00 : 0x0c);
+
+ pmac_low_i2c_setmode(pmac_tb_clock_chip_host, pmac_low_i2c_mode_stdsub);
+ rc = pmac_low_i2c_xfer(pmac_tb_clock_chip_host,
+ 0xd0 | pmac_low_i2c_write,
+ 0x81, &data, 1);
+
+ bail:
+ if (rc != 0) {
+ printk("Cypress Timebase %s rc: %d\n",
+ freeze ? "freeze" : "unfreeze", rc);
+ panic("Timebase freeze failed !\n");
}
-
- return ncpus;
}
-static void __devinit smp_core99_kick_cpu(int nr)
-{
- unsigned long save_vector, new_vector;
- unsigned long flags;
- volatile unsigned long *vector
- = ((volatile unsigned long *)(KERNELBASE+0x100));
- if (nr < 0 || nr > 3)
- return;
- if (ppc_md.progress) ppc_md.progress("smp_core99_kick_cpu", 0x346);
+static void smp_core99_pulsar_tb_freeze(int freeze)
+{
+ u8 data;
+ int rc;
+
+ pmac_low_i2c_setmode(pmac_tb_clock_chip_host, pmac_low_i2c_mode_combined);
+ rc = pmac_low_i2c_xfer(pmac_tb_clock_chip_host,
+ pmac_tb_pulsar_addr | pmac_low_i2c_read,
+ 0x2e, &data, 1);
+ if (rc != 0)
+ goto bail;
+
+ data = (data & 0x88) | (freeze ? 0x11 : 0x22);
+
+ pmac_low_i2c_setmode(pmac_tb_clock_chip_host, pmac_low_i2c_mode_stdsub);
+ rc = pmac_low_i2c_xfer(pmac_tb_clock_chip_host,
+ pmac_tb_pulsar_addr | pmac_low_i2c_write,
+ 0x2e, &data, 1);
+ bail:
+ if (rc != 0) {
+ printk(KERN_ERR "Pulsar Timebase %s rc: %d\n",
+ freeze ? "freeze" : "unfreeze", rc);
+ panic("Timebase freeze failed !\n");
+ }
+}
- local_irq_save(flags);
- local_irq_disable();
- /* Save reset vector */
- save_vector = *vector;
+static void smp_core99_give_timebase(void)
+{
+ /* Open i2c bus for synchronous access */
+ if (pmac_low_i2c_open(pmac_tb_clock_chip_host, 0))
+ panic("Can't open i2c for TB sync !\n");
- /* Setup fake reset vector that does
- * b __secondary_start_pmac_0 + nr*8 - KERNELBASE
- */
- new_vector = (unsigned long) __secondary_start_pmac_0 + nr * 8;
- *vector = 0x48000002 + new_vector - KERNELBASE;
+ spin_lock(&timebase_lock);
+ (*pmac_tb_freeze)(1);
+ mb();
+ timebase = get_tb();
+ spin_unlock(&timebase_lock);
- /* flush data cache and inval instruction cache */
- flush_icache_range((unsigned long) vector, (unsigned long) vector + 4);
+ while (timebase)
+ barrier();
- /* Put some life in our friend */
- pmac_call_feature(PMAC_FTR_RESET_CPU, NULL, nr, 0);
+ spin_lock(&timebase_lock);
+ (*pmac_tb_freeze)(0);
+ spin_unlock(&timebase_lock);
- /* FIXME: We wait a bit for the CPU to take the exception, I should
- * instead wait for the entry code to set something for me. Well,
- * ideally, all that crap will be done in prom.c and the CPU left
- * in a RAM-based wait loop like CHRP.
- */
- mdelay(1);
+ /* Close i2c bus */
+ pmac_low_i2c_close(pmac_tb_clock_chip_host);
+}
- /* Restore our exception vector */
- *vector = save_vector;
- flush_icache_range((unsigned long) vector, (unsigned long) vector + 4);
- local_irq_restore(flags);
- if (ppc_md.progress) ppc_md.progress("smp_core99_kick_cpu done", 0x347);
+static void __devinit smp_core99_take_timebase(void)
+{
+ while (!timebase)
+ barrier();
+ spin_lock(&timebase_lock);
+ set_tb(timebase >> 32, timebase & 0xffffffff);
+ timebase = 0;
+ spin_unlock(&timebase_lock);
}
-static void __devinit smp_core99_setup_cpu(int cpu_nr)
+static void __init smp_core99_setup(int ncpus)
{
- /* Setup L2/L3 */
- if (cpu_nr != 0)
- core99_init_caches(cpu_nr);
+ struct device_node *cc = NULL;
+ struct device_node *p;
+ u32 *reg;
+ int ok;
+
+ /* HW sync only on these platforms */
+ if (!machine_is_compatible("PowerMac7,2") &&
+ !machine_is_compatible("PowerMac7,3") &&
+ !machine_is_compatible("RackMac3,1"))
+ return;
- /* Setup openpic */
- mpic_setup_this_cpu();
+ /* Look for the clock chip */
+ while ((cc = of_find_node_by_name(cc, "i2c-hwclock")) != NULL) {
+ p = of_get_parent(cc);
+ ok = p && device_is_compatible(p, "uni-n-i2c");
+ of_node_put(p);
+ if (!ok)
+ continue;
- if (cpu_nr == 0) {
-#ifdef CONFIG_POWER4
- extern void g5_phy_disable_cpu1(void);
+ reg = (u32 *)get_property(cc, "reg", NULL);
+ if (reg == NULL)
+ continue;
- /* If we didn't start the second CPU, we must take
- * it off the bus
- */
- if (machine_is_compatible("MacRISC4") &&
- num_online_cpus() < 2)
- g5_phy_disable_cpu1();
-#endif /* CONFIG_POWER4 */
- if (ppc_md.progress) ppc_md.progress("core99_setup_cpu 0 done", 0x349);
+ switch (*reg) {
+ case 0xd2:
+ if (device_is_compatible(cc, "pulsar-legacy-slewing")) {
+ pmac_tb_freeze = smp_core99_pulsar_tb_freeze;
+ pmac_tb_pulsar_addr = 0xd2;
+ printk(KERN_INFO "Timebase clock is Pulsar chip\n");
+ } else if (device_is_compatible(cc, "cy28508")) {
+ pmac_tb_freeze = smp_core99_cypress_tb_freeze;
+ printk(KERN_INFO "Timebase clock is Cypress chip\n");
+ }
+ break;
+ case 0xd4:
+ pmac_tb_freeze = smp_core99_pulsar_tb_freeze;
+ pmac_tb_pulsar_addr = 0xd4;
+ printk(KERN_INFO "Timebase clock is Pulsar chip\n");
+ break;
+ }
+ if (pmac_tb_freeze != NULL) {
+ pmac_tb_clock_chip_host = of_get_parent(cc);
+ of_node_put(cc);
+ break;
+ }
+ }
+ if (pmac_tb_freeze == NULL) {
+ smp_ops->give_timebase = smp_generic_give_timebase;
+ smp_ops->take_timebase = smp_generic_take_timebase;
}
}
-/* not __init, called in sleep/wakeup code */
-void smp_core99_take_timebase(void)
+/* nothing to do here, caches are already set up by service processor */
+static inline void __devinit core99_init_caches(int cpu)
{
- unsigned long flags;
+}
- /* tell the primary we're here */
- sec_tb_reset = 1;
- mb();
+#else /* CONFIG_PPC64 */
- /* wait for the primary to set pri_tb_hi/lo */
- while (sec_tb_reset < 2)
- mb();
+/*
+ * SMP G4 powermacs use a GPIO to enable/disable the timebase.
+ */
- /* set our stuff the same as the primary */
- local_irq_save(flags);
- set_dec(1);
- set_tb(pri_tb_hi, pri_tb_lo);
- last_jiffy_stamp(smp_processor_id()) = pri_tb_stamp;
- mb();
+static unsigned int core99_tb_gpio; /* Timebase freeze GPIO */
- /* tell the primary we're done */
- sec_tb_reset = 0;
- mb();
- local_irq_restore(flags);
-}
+static unsigned int pri_tb_hi, pri_tb_lo;
+static unsigned int pri_tb_stamp;
/* not __init, called in sleep/wakeup code */
void smp_core99_give_timebase(void)
@@ -626,43 +635,184 @@ void smp_core99_give_timebase(void)
local_irq_restore(flags);
}
-void smp_core99_message_pass(int target, int msg)
+/* not __init, called in sleep/wakeup code */
+void smp_core99_take_timebase(void)
+{
+ unsigned long flags;
+
+ /* tell the primary we're here */
+ sec_tb_reset = 1;
+ mb();
+
+ /* wait for the primary to set pri_tb_hi/lo */
+ while (sec_tb_reset < 2)
+ mb();
+
+ /* set our stuff the same as the primary */
+ local_irq_save(flags);
+ set_dec(1);
+ set_tb(pri_tb_hi, pri_tb_lo);
+ last_jiffy_stamp(smp_processor_id()) = pri_tb_stamp;
+ mb();
+
+ /* tell the primary we're done */
+ sec_tb_reset = 0;
+ mb();
+ local_irq_restore(flags);
+}
+
+/* L2 and L3 cache settings to pass from CPU0 to CPU1 on G4 cpus */
+volatile static long int core99_l2_cache;
+volatile static long int core99_l3_cache;
+
+static void __devinit core99_init_caches(int cpu)
{
- cpumask_t mask = CPU_MASK_ALL;
- /* make sure we're sending something that translates to an IPI */
- if (msg > 0x3) {
- printk("SMP %d: smp_message_pass: unknown msg %d\n",
- smp_processor_id(), msg);
+ if (!cpu_has_feature(CPU_FTR_L2CR))
return;
+
+ if (cpu == 0) {
+ core99_l2_cache = _get_L2CR();
+ printk("CPU0: L2CR is %lx\n", core99_l2_cache);
+ } else {
+ printk("CPU%d: L2CR was %lx\n", cpu, _get_L2CR());
+ _set_L2CR(0);
+ _set_L2CR(core99_l2_cache);
+ printk("CPU%d: L2CR set to %lx\n", cpu, core99_l2_cache);
}
- switch (target) {
- case MSG_ALL:
- mpic_send_ipi(msg, cpus_addr(mask)[0]);
- break;
- case MSG_ALL_BUT_SELF:
- cpu_clear(smp_processor_id(), mask);
- mpic_send_ipi(msg, cpus_addr(mask)[0]);
- break;
- default:
- mpic_send_ipi(msg, 1 << target);
- break;
+
+ if (!cpu_has_feature(CPU_FTR_L3CR))
+ return;
+
+ if (cpu == 0){
+ core99_l3_cache = _get_L3CR();
+ printk("CPU0: L3CR is %lx\n", core99_l3_cache);
+ } else {
+ printk("CPU%d: L3CR was %lx\n", cpu, _get_L3CR());
+ _set_L3CR(0);
+ _set_L3CR(core99_l3_cache);
+ printk("CPU%d: L3CR set to %lx\n", cpu, core99_l3_cache);
}
}
+static void __init smp_core99_setup(int ncpus)
+{
+ struct device_node *cpu;
+ u32 *tbprop = NULL;
+ int i;
+
+ core99_tb_gpio = KL_GPIO_TB_ENABLE; /* default value */
+ cpu = of_find_node_by_type(NULL, "cpu");
+ if (cpu != NULL) {
+ tbprop = (u32 *)get_property(cpu, "timebase-enable", NULL);
+ if (tbprop)
+ core99_tb_gpio = *tbprop;
+ of_node_put(cpu);
+ }
+
+ /* XXX should get this from reg properties */
+ for (i = 1; i < ncpus; ++i)
+ smp_hw_index[i] = i;
+ powersave_nap = 0;
+}
+#endif
+
+static int __init smp_core99_probe(void)
+{
+ struct device_node *cpus;
+ int ncpus = 0;
+
+ if (ppc_md.progress) ppc_md.progress("smp_core99_probe", 0x345);
+
+ /* Count CPUs in the device-tree */
+ for (cpus = NULL; (cpus = of_find_node_by_type(cpus, "cpu")) != NULL;)
+ ++ncpus;
+
+ printk(KERN_INFO "PowerMac SMP probe found %d cpus\n", ncpus);
+
+ /* Nothing more to do if less than 2 of them */
+ if (ncpus <= 1)
+ return 1;
+
+ smp_core99_setup(ncpus);
+ mpic_request_ipis();
+ core99_init_caches(0);
+
+ return ncpus;
+}
+
+static void __devinit smp_core99_kick_cpu(int nr)
+{
+ unsigned int save_vector;
+ unsigned long new_vector;
+ unsigned long flags;
+ volatile unsigned int *vector
+ = ((volatile unsigned int *)(KERNELBASE+0x100));
+
+ if (nr < 0 || nr > 3)
+ return;
+ if (ppc_md.progress) ppc_md.progress("smp_core99_kick_cpu", 0x346);
+
+ local_irq_save(flags);
+ local_irq_disable();
+
+ /* Save reset vector */
+ save_vector = *vector;
+
+ /* Setup fake reset vector that does
+ * b __secondary_start_pmac_0 + nr*8 - KERNELBASE
+ */
+ new_vector = (unsigned long) __secondary_start_pmac_0 + nr * 8;
+ *vector = 0x48000002 + new_vector - KERNELBASE;
+
+ /* flush data cache and inval instruction cache */
+ flush_icache_range((unsigned long) vector, (unsigned long) vector + 4);
+
+ /* Put some life in our friend */
+ pmac_call_feature(PMAC_FTR_RESET_CPU, NULL, nr, 0);
+
+ /* FIXME: We wait a bit for the CPU to take the exception, I should
+ * instead wait for the entry code to set something for me. Well,
+ * ideally, all that crap will be done in prom.c and the CPU left
+ * in a RAM-based wait loop like CHRP.
+ */
+ mdelay(1);
+
+ /* Restore our exception vector */
+ *vector = save_vector;
+ flush_icache_range((unsigned long) vector, (unsigned long) vector + 4);
+
+ local_irq_restore(flags);
+ if (ppc_md.progress) ppc_md.progress("smp_core99_kick_cpu done", 0x347);
+}
+
+static void __devinit smp_core99_setup_cpu(int cpu_nr)
+{
+ /* Setup L2/L3 */
+ if (cpu_nr != 0)
+ core99_init_caches(cpu_nr);
+
+ /* Setup openpic */
+ mpic_setup_this_cpu();
+
+ if (cpu_nr == 0) {
+#ifdef CONFIG_POWER4
+ extern void g5_phy_disable_cpu1(void);
+
+ /* If we didn't start the second CPU, we must take
+ * it off the bus
+ */
+ if (machine_is_compatible("MacRISC4") &&
+ num_online_cpus() < 2)
+ g5_phy_disable_cpu1();
+#endif /* CONFIG_POWER4 */
+ if (ppc_md.progress) ppc_md.progress("core99_setup_cpu 0 done", 0x349);
+ }
+}
-/* PowerSurge-style Macs */
-struct smp_ops_t psurge_smp_ops = {
- .message_pass = smp_psurge_message_pass,
- .probe = smp_psurge_probe,
- .kick_cpu = smp_psurge_kick_cpu,
- .setup_cpu = smp_psurge_setup_cpu,
- .give_timebase = smp_psurge_give_timebase,
- .take_timebase = smp_psurge_take_timebase,
-};
-/* Core99 Macs (dual G4s) */
+/* Core99 Macs (dual G4s and G5s) */
struct smp_ops_t core99_smp_ops = {
- .message_pass = smp_core99_message_pass,
+ .message_pass = smp_mpic_message_pass,
.probe = smp_core99_probe,
.kick_cpu = smp_core99_kick_cpu,
.setup_cpu = smp_core99_setup_cpu,
@@ -670,7 +820,7 @@ struct smp_ops_t core99_smp_ops = {
.take_timebase = smp_core99_take_timebase,
};
-#ifdef CONFIG_HOTPLUG_CPU
+#if defined(CONFIG_HOTPLUG_CPU) && defined(CONFIG_PPC32)
int __cpu_disable(void)
{
@@ -685,7 +835,7 @@ int __cpu_disable(void)
return 0;
}
-extern void low_cpu_die(void) __attribute__((noreturn)); /* in pmac_sleep.S */
+extern void low_cpu_die(void) __attribute__((noreturn)); /* in sleep.S */
static int cpu_dead[NR_CPUS];
void cpu_die(void)
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-12 01:55:35 +0000