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-rw-r--r--arch/powerpc/platforms/powermac/cpufreq_64.c496
1 files changed, 449 insertions, 47 deletions
diff --git a/arch/powerpc/platforms/powermac/cpufreq_64.c b/arch/powerpc/platforms/powermac/cpufreq_64.c
index 39150342c6f..a4b50c4109c 100644
--- a/arch/powerpc/platforms/powermac/cpufreq_64.c
+++ b/arch/powerpc/platforms/powermac/cpufreq_64.c
@@ -28,6 +28,7 @@
#include <asm/cputable.h>
#include <asm/time.h>
#include <asm/smu.h>
+#include <asm/pmac_pfunc.h>
#undef DEBUG
@@ -85,6 +86,10 @@ static u32 *g5_pmode_data;
static int g5_pmode_max;
static int g5_pmode_cur;
+static void (*g5_switch_volt)(int speed_mode);
+static int (*g5_switch_freq)(int speed_mode);
+static int (*g5_query_freq)(void);
+
static DECLARE_MUTEX(g5_switch_mutex);
@@ -92,9 +97,11 @@ static struct smu_sdbp_fvt *g5_fvt_table; /* table of op. points */
static int g5_fvt_count; /* number of op. points */
static int g5_fvt_cur; /* current op. point */
-/* ----------------- real hardware interface */
+/*
+ * SMU based voltage switching for Neo2 platforms
+ */
-static void g5_switch_volt(int speed_mode)
+static void g5_smu_switch_volt(int speed_mode)
{
struct smu_simple_cmd cmd;
@@ -105,26 +112,57 @@ static void g5_switch_volt(int speed_mode)
wait_for_completion(&comp);
}
-static int g5_switch_freq(int speed_mode)
+/*
+ * Platform function based voltage/vdnap switching for Neo2
+ */
+
+static struct pmf_function *pfunc_set_vdnap0;
+static struct pmf_function *pfunc_vdnap0_complete;
+
+static void g5_vdnap_switch_volt(int speed_mode)
{
- struct cpufreq_freqs freqs;
- int to;
+ struct pmf_args args;
+ u32 slew, done = 0;
+ unsigned long timeout;
- if (g5_pmode_cur == speed_mode)
- return 0;
+ slew = (speed_mode == CPUFREQ_LOW) ? 1 : 0;
+ args.count = 1;
+ args.u[0].p = &slew;
- down(&g5_switch_mutex);
+ pmf_call_one(pfunc_set_vdnap0, &args);
- freqs.old = g5_cpu_freqs[g5_pmode_cur].frequency;
- freqs.new = g5_cpu_freqs[speed_mode].frequency;
- freqs.cpu = 0;
+ /* It's an irq GPIO so we should be able to just block here,
+ * I'll do that later after I've properly tested the IRQ code for
+ * platform functions
+ */
+ timeout = jiffies + HZ/10;
+ while(!time_after(jiffies, timeout)) {
+ args.count = 1;
+ args.u[0].p = &done;
+ pmf_call_one(pfunc_vdnap0_complete, &args);
+ if (done)
+ break;
+ msleep(1);
+ }
+ if (done == 0)
+ printk(KERN_WARNING "cpufreq: Timeout in clock slewing !\n");
+}
- cpufreq_notify_transition(&freqs, CPUFREQ_PRECHANGE);
+
+/*
+ * SCOM based frequency switching for 970FX rev3
+ */
+static int g5_scom_switch_freq(int speed_mode)
+{
+ unsigned long flags;
+ int to;
/* If frequency is going up, first ramp up the voltage */
if (speed_mode < g5_pmode_cur)
g5_switch_volt(speed_mode);
+ local_irq_save(flags);
+
/* Clear PCR high */
scom970_write(SCOM_PCR, 0);
/* Clear PCR low */
@@ -147,6 +185,8 @@ static int g5_switch_freq(int speed_mode)
udelay(100);
}
+ local_irq_restore(flags);
+
/* If frequency is going down, last ramp the voltage */
if (speed_mode > g5_pmode_cur)
g5_switch_volt(speed_mode);
@@ -154,14 +194,10 @@ static int g5_switch_freq(int speed_mode)
g5_pmode_cur = speed_mode;
ppc_proc_freq = g5_cpu_freqs[speed_mode].frequency * 1000ul;
- cpufreq_notify_transition(&freqs, CPUFREQ_POSTCHANGE);
-
- up(&g5_switch_mutex);
-
return 0;
}
-static int g5_query_freq(void)
+static int g5_scom_query_freq(void)
{
unsigned long psr = scom970_read(SCOM_PSR);
int i;
@@ -173,7 +209,104 @@ static int g5_query_freq(void)
return i;
}
-/* ----------------- cpufreq bookkeeping */
+/*
+ * Platform function based voltage switching for PowerMac7,2 & 7,3
+ */
+
+static struct pmf_function *pfunc_cpu0_volt_high;
+static struct pmf_function *pfunc_cpu0_volt_low;
+static struct pmf_function *pfunc_cpu1_volt_high;
+static struct pmf_function *pfunc_cpu1_volt_low;
+
+static void g5_pfunc_switch_volt(int speed_mode)
+{
+ if (speed_mode == CPUFREQ_HIGH) {
+ if (pfunc_cpu0_volt_high)
+ pmf_call_one(pfunc_cpu0_volt_high, NULL);
+ if (pfunc_cpu1_volt_high)
+ pmf_call_one(pfunc_cpu1_volt_high, NULL);
+ } else {
+ if (pfunc_cpu0_volt_low)
+ pmf_call_one(pfunc_cpu0_volt_low, NULL);
+ if (pfunc_cpu1_volt_low)
+ pmf_call_one(pfunc_cpu1_volt_low, NULL);
+ }
+ msleep(10); /* should be faster , to fix */
+}
+
+/*
+ * Platform function based frequency switching for PowerMac7,2 & 7,3
+ */
+
+static struct pmf_function *pfunc_cpu_setfreq_high;
+static struct pmf_function *pfunc_cpu_setfreq_low;
+static struct pmf_function *pfunc_cpu_getfreq;
+static struct pmf_function *pfunc_slewing_done;;
+
+static int g5_pfunc_switch_freq(int speed_mode)
+{
+ struct pmf_args args;
+ u32 done = 0;
+ unsigned long timeout;
+
+ /* If frequency is going up, first ramp up the voltage */
+ if (speed_mode < g5_pmode_cur)
+ g5_switch_volt(speed_mode);
+
+ /* Do it */
+ if (speed_mode == CPUFREQ_HIGH)
+ pmf_call_one(pfunc_cpu_setfreq_high, NULL);
+ else
+ pmf_call_one(pfunc_cpu_setfreq_low, NULL);
+
+ /* It's an irq GPIO so we should be able to just block here,
+ * I'll do that later after I've properly tested the IRQ code for
+ * platform functions
+ */
+ timeout = jiffies + HZ/10;
+ while(!time_after(jiffies, timeout)) {
+ args.count = 1;
+ args.u[0].p = &done;
+ pmf_call_one(pfunc_slewing_done, &args);
+ if (done)
+ break;
+ msleep(1);
+ }
+ if (done == 0)
+ printk(KERN_WARNING "cpufreq: Timeout in clock slewing !\n");
+
+ /* If frequency is going down, last ramp the voltage */
+ if (speed_mode > g5_pmode_cur)
+ g5_switch_volt(speed_mode);
+
+ g5_pmode_cur = speed_mode;
+ ppc_proc_freq = g5_cpu_freqs[speed_mode].frequency * 1000ul;
+
+ return 0;
+}
+
+static int g5_pfunc_query_freq(void)
+{
+ struct pmf_args args;
+ u32 val = 0;
+
+ args.count = 1;
+ args.u[0].p = &val;
+ pmf_call_one(pfunc_cpu_getfreq, &args);
+ return val ? CPUFREQ_HIGH : CPUFREQ_LOW;
+}
+
+/*
+ * Fake voltage switching for platforms with missing support
+ */
+
+static void g5_dummy_switch_volt(int speed_mode)
+{
+}
+
+/*
+ * Common interface to the cpufreq core
+ */
static int g5_cpufreq_verify(struct cpufreq_policy *policy)
{
@@ -183,13 +316,30 @@ static int g5_cpufreq_verify(struct cpufreq_policy *policy)
static int g5_cpufreq_target(struct cpufreq_policy *policy,
unsigned int target_freq, unsigned int relation)
{
- unsigned int newstate = 0;
+ unsigned int newstate = 0;
+ struct cpufreq_freqs freqs;
+ int rc;
if (cpufreq_frequency_table_target(policy, g5_cpu_freqs,
target_freq, relation, &newstate))
return -EINVAL;
- return g5_switch_freq(newstate);
+ if (g5_pmode_cur == newstate)
+ return 0;
+
+ down(&g5_switch_mutex);
+
+ freqs.old = g5_cpu_freqs[g5_pmode_cur].frequency;
+ freqs.new = g5_cpu_freqs[newstate].frequency;
+ freqs.cpu = 0;
+
+ cpufreq_notify_transition(&freqs, CPUFREQ_PRECHANGE);
+ rc = g5_switch_freq(newstate);
+ cpufreq_notify_transition(&freqs, CPUFREQ_POSTCHANGE);
+
+ up(&g5_switch_mutex);
+
+ return rc;
}
static unsigned int g5_cpufreq_get_speed(unsigned int cpu)
@@ -205,6 +355,7 @@ static int g5_cpufreq_cpu_init(struct cpufreq_policy *policy)
policy->governor = CPUFREQ_DEFAULT_GOVERNOR;
policy->cpuinfo.transition_latency = CPUFREQ_ETERNAL;
policy->cur = g5_cpu_freqs[g5_query_freq()].frequency;
+ policy->cpus = cpu_possible_map;
cpufreq_frequency_table_get_attr(g5_cpu_freqs, policy->cpu);
return cpufreq_frequency_table_cpuinfo(policy,
@@ -224,19 +375,39 @@ static struct cpufreq_driver g5_cpufreq_driver = {
};
-static int __init g5_cpufreq_init(void)
+static int __init g5_neo2_cpufreq_init(struct device_node *cpus)
{
struct device_node *cpunode;
unsigned int psize, ssize;
- struct smu_sdbp_header *shdr;
unsigned long max_freq;
- u32 *valp;
+ char *freq_method, *volt_method;
+ u32 *valp, pvr_hi;
+ int use_volts_vdnap = 0;
+ int use_volts_smu = 0;
int rc = -ENODEV;
- /* Look for CPU and SMU nodes */
- cpunode = of_find_node_by_type(NULL, "cpu");
- if (!cpunode) {
- DBG("No CPU node !\n");
+ /* Check supported platforms */
+ if (machine_is_compatible("PowerMac8,1") ||
+ machine_is_compatible("PowerMac8,2") ||
+ machine_is_compatible("PowerMac9,1"))
+ use_volts_smu = 1;
+ else if (machine_is_compatible("PowerMac11,2"))
+ use_volts_vdnap = 1;
+ else
+ return -ENODEV;
+
+ /* Get first CPU node */
+ for (cpunode = NULL;
+ (cpunode = of_get_next_child(cpus, cpunode)) != NULL;) {
+ u32 *reg =
+ (u32 *)get_property(cpunode, "reg", NULL);
+ if (reg == NULL || (*reg) != 0)
+ continue;
+ if (!strcmp(cpunode->type, "cpu"))
+ break;
+ }
+ if (cpunode == NULL) {
+ printk(KERN_ERR "cpufreq: Can't find any CPU 0 node\n");
return -ENODEV;
}
@@ -246,8 +417,9 @@ static int __init g5_cpufreq_init(void)
DBG("No cpu-version property !\n");
goto bail_noprops;
}
- if (((*valp) >> 16) != 0x3c) {
- DBG("Wrong CPU version: %08x\n", *valp);
+ pvr_hi = (*valp) >> 16;
+ if (pvr_hi != 0x3c && pvr_hi != 0x44) {
+ printk(KERN_ERR "cpufreq: Unsupported CPU version\n");
goto bail_noprops;
}
@@ -259,18 +431,50 @@ static int __init g5_cpufreq_init(void)
}
g5_pmode_max = psize / sizeof(u32) - 1;
- /* Look for the FVT table */
- shdr = smu_get_sdb_partition(SMU_SDB_FVT_ID, NULL);
- if (!shdr)
- goto bail_noprops;
- g5_fvt_table = (struct smu_sdbp_fvt *)&shdr[1];
- ssize = (shdr->len * sizeof(u32)) - sizeof(struct smu_sdbp_header);
- g5_fvt_count = ssize / sizeof(struct smu_sdbp_fvt);
- g5_fvt_cur = 0;
-
- /* Sanity checking */
- if (g5_fvt_count < 1 || g5_pmode_max < 1)
- goto bail_noprops;
+ if (use_volts_smu) {
+ struct smu_sdbp_header *shdr;
+
+ /* Look for the FVT table */
+ shdr = smu_get_sdb_partition(SMU_SDB_FVT_ID, NULL);
+ if (!shdr)
+ goto bail_noprops;
+ g5_fvt_table = (struct smu_sdbp_fvt *)&shdr[1];
+ ssize = (shdr->len * sizeof(u32)) -
+ sizeof(struct smu_sdbp_header);
+ g5_fvt_count = ssize / sizeof(struct smu_sdbp_fvt);
+ g5_fvt_cur = 0;
+
+ /* Sanity checking */
+ if (g5_fvt_count < 1 || g5_pmode_max < 1)
+ goto bail_noprops;
+
+ g5_switch_volt = g5_smu_switch_volt;
+ volt_method = "SMU";
+ } else if (use_volts_vdnap) {
+ struct device_node *root;
+
+ root = of_find_node_by_path("/");
+ if (root == NULL) {
+ printk(KERN_ERR "cpufreq: Can't find root of "
+ "device tree\n");
+ goto bail_noprops;
+ }
+ pfunc_set_vdnap0 = pmf_find_function(root, "set-vdnap0");
+ pfunc_vdnap0_complete =
+ pmf_find_function(root, "slewing-done");
+ if (pfunc_set_vdnap0 == NULL ||
+ pfunc_vdnap0_complete == NULL) {
+ printk(KERN_ERR "cpufreq: Can't find required "
+ "platform function\n");
+ goto bail_noprops;
+ }
+
+ g5_switch_volt = g5_vdnap_switch_volt;
+ volt_method = "GPIO";
+ } else {
+ g5_switch_volt = g5_dummy_switch_volt;
+ volt_method = "none";
+ }
/*
* From what I see, clock-frequency is always the maximal frequency.
@@ -286,19 +490,23 @@ static int __init g5_cpufreq_init(void)
g5_cpu_freqs[0].frequency = max_freq;
g5_cpu_freqs[1].frequency = max_freq/2;
- /* Check current frequency */
- g5_pmode_cur = g5_query_freq();
- if (g5_pmode_cur > 1)
- /* We don't support anything but 1:1 and 1:2, fixup ... */
- g5_pmode_cur = 1;
+ /* Set callbacks */
+ g5_switch_freq = g5_scom_switch_freq;
+ g5_query_freq = g5_scom_query_freq;
+ freq_method = "SCOM";
/* Force apply current frequency to make sure everything is in
* sync (voltage is right for example). Firmware may leave us with
* a strange setting ...
*/
- g5_switch_freq(g5_pmode_cur);
+ g5_switch_volt(CPUFREQ_HIGH);
+ msleep(10);
+ g5_pmode_cur = -1;
+ g5_switch_freq(g5_query_freq());
printk(KERN_INFO "Registering G5 CPU frequency driver\n");
+ printk(KERN_INFO "Frequency method: %s, Voltage method: %s\n",
+ freq_method, volt_method);
printk(KERN_INFO "Low: %d Mhz, High: %d Mhz, Cur: %d MHz\n",
g5_cpu_freqs[1].frequency/1000,
g5_cpu_freqs[0].frequency/1000,
@@ -317,6 +525,200 @@ static int __init g5_cpufreq_init(void)
return rc;
}
+static int __init g5_pm72_cpufreq_init(struct device_node *cpus)
+{
+ struct device_node *cpuid = NULL, *hwclock = NULL, *cpunode = NULL;
+ u8 *eeprom = NULL;
+ u32 *valp;
+ u64 max_freq, min_freq, ih, il;
+ int has_volt = 1, rc = 0;
+
+ /* Get first CPU node */
+ for (cpunode = NULL;
+ (cpunode = of_get_next_child(cpus, cpunode)) != NULL;) {
+ if (!strcmp(cpunode->type, "cpu"))
+ break;
+ }
+ if (cpunode == NULL) {
+ printk(KERN_ERR "cpufreq: Can't find any CPU node\n");
+ return -ENODEV;
+ }
+
+ /* Lookup the cpuid eeprom node */
+ cpuid = of_find_node_by_path("/u3@0,f8000000/i2c@f8001000/cpuid@a0");
+ if (cpuid != NULL)
+ eeprom = (u8 *)get_property(cpuid, "cpuid", NULL);
+ if (eeprom == NULL) {
+ printk(KERN_ERR "cpufreq: Can't find cpuid EEPROM !\n");
+ rc = -ENODEV;
+ goto bail;
+ }
+
+ /* Lookup the i2c hwclock */
+ for (hwclock = NULL;
+ (hwclock = of_find_node_by_name(hwclock, "i2c-hwclock")) != NULL;){
+ char *loc = get_property(hwclock, "hwctrl-location", NULL);
+ if (loc == NULL)
+ continue;
+ if (strcmp(loc, "CPU CLOCK"))
+ continue;
+ if (!get_property(hwclock, "platform-get-frequency", NULL))
+ continue;
+ break;
+ }
+ if (hwclock == NULL) {
+ printk(KERN_ERR "cpufreq: Can't find i2c clock chip !\n");
+ rc = -ENODEV;
+ goto bail;
+ }
+
+ DBG("cpufreq: i2c clock chip found: %s\n", hwclock->full_name);
+
+ /* Now get all the platform functions */
+ pfunc_cpu_getfreq =
+ pmf_find_function(hwclock, "get-frequency");
+ pfunc_cpu_setfreq_high =
+ pmf_find_function(hwclock, "set-frequency-high");
+ pfunc_cpu_setfreq_low =
+ pmf_find_function(hwclock, "set-frequency-low");
+ pfunc_slewing_done =
+ pmf_find_function(hwclock, "slewing-done");
+ pfunc_cpu0_volt_high =
+ pmf_find_function(hwclock, "set-voltage-high-0");
+ pfunc_cpu0_volt_low =
+ pmf_find_function(hwclock, "set-voltage-low-0");
+ pfunc_cpu1_volt_high =
+ pmf_find_function(hwclock, "set-voltage-high-1");
+ pfunc_cpu1_volt_low =
+ pmf_find_function(hwclock, "set-voltage-low-1");
+
+ /* Check we have minimum requirements */
+ if (pfunc_cpu_getfreq == NULL || pfunc_cpu_setfreq_high == NULL ||
+ pfunc_cpu_setfreq_low == NULL || pfunc_slewing_done == NULL) {
+ printk(KERN_ERR "cpufreq: Can't find platform functions !\n");
+ rc = -ENODEV;
+ goto bail;
+ }
+
+ /* Check that we have complete sets */
+ if (pfunc_cpu0_volt_high == NULL || pfunc_cpu0_volt_low == NULL) {
+ pmf_put_function(pfunc_cpu0_volt_high);
+ pmf_put_function(pfunc_cpu0_volt_low);
+ pfunc_cpu0_volt_high = pfunc_cpu0_volt_low = NULL;
+ has_volt = 0;
+ }
+ if (!has_volt ||
+ pfunc_cpu1_volt_high == NULL || pfunc_cpu1_volt_low == NULL) {
+ pmf_put_function(pfunc_cpu1_volt_high);
+ pmf_put_function(pfunc_cpu1_volt_low);
+ pfunc_cpu1_volt_high = pfunc_cpu1_volt_low = NULL;
+ }
+
+ /* Note: The device tree also contains a "platform-set-values"
+ * function for which I haven't quite figured out the usage. It
+ * might have to be called on init and/or wakeup, I'm not too sure
+ * but things seem to work fine without it so far ...
+ */
+
+ /* Get max frequency from device-tree */
+ valp = (u32 *)get_property(cpunode, "clock-frequency", NULL);
+ if (!valp) {
+ printk(KERN_ERR "cpufreq: Can't find CPU frequency !\n");
+ rc = -ENODEV;
+ goto bail;
+ }
+
+ max_freq = (*valp)/1000;
+
+ /* Now calculate reduced frequency by using the cpuid input freq
+ * ratio. This requires 64 bits math unless we are willing to lose
+ * some precision
+ */
+ ih = *((u32 *)(eeprom + 0x10));
+ il = *((u32 *)(eeprom + 0x20));
+ min_freq = 0;
+ if (ih != 0 && il != 0)
+ min_freq = (max_freq * il) / ih;
+
+ /* Sanity check */
+ if (min_freq >= max_freq || min_freq < 1000) {
+ printk(KERN_ERR "cpufreq: Can't calculate low frequency !\n");
+ rc = -ENODEV;
+ goto bail;
+ }
+ g5_cpu_freqs[0].frequency = max_freq;
+ g5_cpu_freqs[1].frequency = min_freq;
+
+ /* Set callbacks */
+ g5_switch_volt = g5_pfunc_switch_volt;
+ g5_switch_freq = g5_pfunc_switch_freq;
+ g5_query_freq = g5_pfunc_query_freq;
+
+ /* Force apply current frequency to make sure everything is in
+ * sync (voltage is right for example). Firmware may leave us with
+ * a strange setting ...
+ */
+ g5_switch_volt(CPUFREQ_HIGH);
+ msleep(10);
+ g5_pmode_cur = -1;
+ g5_switch_freq(g5_query_freq());
+
+ printk(KERN_INFO "Registering G5 CPU frequency driver\n");
+ printk(KERN_INFO "Frequency method: i2c/pfunc, "
+ "Voltage method: %s\n", has_volt ? "i2c/pfunc" : "none");
+ printk(KERN_INFO "Low: %d Mhz, High: %d Mhz, Cur: %d MHz\n",
+ g5_cpu_freqs[1].frequency/1000,
+ g5_cpu_freqs[0].frequency/1000,
+ g5_cpu_freqs[g5_pmode_cur].frequency/1000);
+
+ rc = cpufreq_register_driver(&g5_cpufreq_driver);
+ bail:
+ if (rc != 0) {
+ pmf_put_function(pfunc_cpu_getfreq);
+ pmf_put_function(pfunc_cpu_setfreq_high);
+ pmf_put_function(pfunc_cpu_setfreq_low);
+ pmf_put_function(pfunc_slewing_done);
+ pmf_put_function(pfunc_cpu0_volt_high);
+ pmf_put_function(pfunc_cpu0_volt_low);
+ pmf_put_function(pfunc_cpu1_volt_high);
+ pmf_put_function(pfunc_cpu1_volt_low);
+ }
+ of_node_put(hwclock);
+ of_node_put(cpuid);
+ of_node_put(cpunode);
+
+ return rc;
+}
+
+static int __init g5_rm31_cpufreq_init(struct device_node *cpus)
+{
+ /* NYI */
+ return 0;
+}
+
+static int __init g5_cpufreq_init(void)
+{
+ struct device_node *cpus;
+ int rc;
+
+ cpus = of_find_node_by_path("/cpus");
+ if (cpus == NULL) {
+ DBG("No /cpus node !\n");
+ return -ENODEV;
+ }
+
+ if (machine_is_compatible("PowerMac7,2") ||
+ machine_is_compatible("PowerMac7,3"))
+ rc = g5_pm72_cpufreq_init(cpus);
+ else if (machine_is_compatible("RackMac3,1"))
+ rc = g5_rm31_cpufreq_init(cpus);
+ else
+ rc = g5_neo2_cpufreq_init(cpus);
+
+ of_node_put(cpus);
+ return rc;
+}
+
module_init(g5_cpufreq_init);
generated by cgit v1.2.3-18-g5258 (git 2.32.0) at 2024-12-02 07:36:44 +0000