[CELL] cbe_cpufreq: reorganize code

This patch reorganizes the code of the driver into three files.
Two cbe_cpufreq_pmi.c and cbe_cpufreq_pervasive.c care about hardware.
cbe_cpufreq.c contains the logic.
There is no changed behaviour, except that the PMI related function
is now located in a seperate module cbe_cpufreq_pmi. This module
will be required by cbe_cpufreq, if CONFIG_CBE_CPUFREQ_PMI has been set.

Signed-off-by: Christian Krafft <krafft@de.ibm.com>
Signed-off-by: Arnd Bergmann <arnd.bergmann@de.ibm.com>

6 files changed, 309 insertions, 188 deletions

diff --git a/arch/powerpc/platforms/cell/Kconfig b/arch/powerpc/platforms/cell/Kconfig
index 9b2b386ccf48..ac8032034fb8 100644
--- a/arch/powerpc/platforms/cell/Kconfig
+++ b/arch/powerpc/platforms/cell/Kconfig
@@ -73,4 +73,14 @@ config CBE_CPUFREQ
           For details, take a look at <file:Documentation/cpu-freq/>.
           If you don't have such processor, say N
 
+config CBE_CPUFREQ_PMI
+        tristate "CBE frequency scaling using PMI interface"
+        depends on CBE_CPUFREQ && PPC_PMI && EXPERIMENTAL
+        default n
+        help
+          Select this, if you want to use the PMI interface
+          to switch frequencies. Using PMI, the
+          processor will not only be able to run at lower speed,
+          but also at lower core voltage.
+
 endmenu
diff --git a/arch/powerpc/platforms/cell/Makefile b/arch/powerpc/platforms/cell/Makefile
index 869af89df6ff..be059718becd 100644
--- a/arch/powerpc/platforms/cell/Makefile
+++ b/arch/powerpc/platforms/cell/Makefile
@@ -4,7 +4,9 @@ obj-$(CONFIG_PPC_CELL_NATIVE)		+= interrupt.o iommu.o setup.o \
 obj-$(CONFIG_CBE_RAS)                   += ras.o
 
 obj-$(CONFIG_CBE_THERM)                 += cbe_thermal.o
-obj-$(CONFIG_CBE_CPUFREQ)               += cbe_cpufreq.o
+obj-$(CONFIG_CBE_CPUFREQ_PMI)           += cbe_cpufreq_pmi.o
+obj-$(CONFIG_CBE_CPUFREQ)               += cbe-cpufreq.o
+cbe-cpufreq-y                           += cbe_cpufreq_pervasive.o cbe_cpufreq.o
 
 ifeq ($(CONFIG_SMP),y)
 obj-$(CONFIG_PPC_CELL_NATIVE)           += smp.o
diff --git a/arch/powerpc/platforms/cell/cbe_cpufreq.c b/arch/powerpc/platforms/cell/cbe_cpufreq.c
index a62562ee1461..9a9932624c0c 100644
--- a/arch/powerpc/platforms/cell/cbe_cpufreq.c
+++ b/arch/powerpc/platforms/cell/cbe_cpufreq.c
@@ -1,7 +1,7 @@
 /*
  * cpufreq driver for the cell processor
  *
- * (C) Copyright IBM Deutschland Entwicklung GmbH 2005
+ * (C) Copyright IBM Deutschland Entwicklung GmbH 2005-2007
  *
  * Author: Christian Krafft <krafft@de.ibm.com>
  *
@@ -21,18 +21,10 @@
  */
 
 #include <linux/cpufreq.h>
-#include <linux/timer.h>
-
-#include <asm/hw_irq.h>
-#include <asm/io.h>
 #include <asm/machdep.h>
-#include <asm/processor.h>
-#include <asm/prom.h>
-#include <asm/time.h>
-#include <asm/pmi.h>
 #include <asm/of_platform.h>
-
-#include "cbe_regs.h"
+#include <asm/prom.h>
+#include "cbe_cpufreq.h"
 
 static DEFINE_MUTEX(cbe_switch_mutex);
 
@@ -50,183 +42,24 @@ static struct cpufreq_frequency_table cbe_freqs[] = {
         {0,     CPUFREQ_TABLE_END},
 };
 
-/* to write to MIC register */
-static u64 MIC_Slow_Fast_Timer_table[] = {
-        [0 ... 7] = 0x007fc00000000000ull,
-};
-
-/* more values for the MIC */
-static u64 MIC_Slow_Next_Timer_table[] = {
-        0x0000240000000000ull,
-        0x0000268000000000ull,
-        0x000029C000000000ull,
-        0x00002D0000000000ull,
-        0x0000300000000000ull,
-        0x0000334000000000ull,
-        0x000039C000000000ull,
-        0x00003FC000000000ull,
-};
-
-static u8 pmi_slow_mode_limit[MAX_BE];
-
 /*
  * hardware specific functions
  */
 
-static bool cbe_cpufreq_has_pmi;
-
-#ifdef CONFIG_PPC_PMI
-static int set_pmode_pmi(int cpu, unsigned int pmode)
-{
-        int ret;
-        pmi_message_t pmi_msg;
-#ifdef DEBUG
-        long time;
-#endif
-
-        pmi_msg.type = PMI_TYPE_FREQ_CHANGE;
-        pmi_msg.data1 = cbe_cpu_to_node(cpu);
-        pmi_msg.data2 = pmode;
-
-#ifdef DEBUG
-        time = jiffies;
-#endif
-
-        pmi_send_message(pmi_msg);
-        ret = pmi_msg.data2;
-
-        pr_debug("PMI returned slow mode %d\n", ret);
-
-#ifdef DEBUG
-        time = jiffies - time; /* actual cycles (not cpu cycles!) */
-        time = jiffies_to_msecs(time);
-        pr_debug("had to wait %lu ms for a transition using PMI.\n", time);
-#endif
-        return ret;
-}
-#endif
-
-static int get_pmode(int cpu)
-{
-        int ret;
-        struct cbe_pmd_regs __iomem *pmd_regs;
-
-        pmd_regs = cbe_get_cpu_pmd_regs(cpu);
-        ret = in_be64(&pmd_regs->pmsr) & 0x07;
-
-        return ret;
-}
-
-static int set_pmode_reg(int cpu, unsigned int pmode)
-{
-        struct cbe_pmd_regs __iomem *pmd_regs;
-        struct cbe_mic_tm_regs __iomem *mic_tm_regs;
-        u64 flags;
-        u64 value;
-#ifdef DEBUG
-        long time;
-#endif
-
-        local_irq_save(flags);
-
-        mic_tm_regs = cbe_get_cpu_mic_tm_regs(cpu);
-        pmd_regs = cbe_get_cpu_pmd_regs(cpu);
-
-#ifdef DEBUG
-        time = jiffies;
-#endif
-        out_be64(&mic_tm_regs->slow_fast_timer_0, MIC_Slow_Fast_Timer_table[pmode]);
-        out_be64(&mic_tm_regs->slow_fast_timer_1, MIC_Slow_Fast_Timer_table[pmode]);
-
-        out_be64(&mic_tm_regs->slow_next_timer_0, MIC_Slow_Next_Timer_table[pmode]);
-        out_be64(&mic_tm_regs->slow_next_timer_1, MIC_Slow_Next_Timer_table[pmode]);
-
-        value = in_be64(&pmd_regs->pmcr);
-        /* set bits to zero */
-        value &= 0xFFFFFFFFFFFFFFF8ull;
-        /* set bits to next pmode */
-        value |= pmode;
-
-        out_be64(&pmd_regs->pmcr, value);
-
-#ifdef DEBUG
-        /* wait until new pmode appears in status register */
-        value = in_be64(&pmd_regs->pmsr) & 0x07;
-        while(value != pmode) {
-                cpu_relax();
-                value = in_be64(&pmd_regs->pmsr) & 0x07;
-        }
-
-        time = jiffies - time;
-        time = jiffies_to_msecs(time);
-        pr_debug("had to wait %lu ms for a transition using " \
-                 "the pervasive unit.\n", time);
-#endif
-        local_irq_restore(flags);
-
-        return 0;
-}
-
-static int set_pmode(int cpu, unsigned int slow_mode)
+static int set_pmode(unsigned int cpu, unsigned int slow_mode)
 {
         int rc;
-#ifdef CONFIG_PPC_PMI
+
         if (cbe_cpufreq_has_pmi)
-                rc = set_pmode_pmi(cpu, slow_mode);
+                rc = cbe_cpufreq_set_pmode_pmi(cpu, slow_mode);
         else
-#endif
-                rc = set_pmode_reg(cpu, slow_mode);
+                rc = cbe_cpufreq_set_pmode(cpu, slow_mode);
 
-        pr_debug("register contains slow mode %d\n", get_pmode(cpu));
+        pr_debug("register contains slow mode %d\n", cbe_cpufreq_get_pmode(cpu));
 
         return rc;
 }
 
-static void cbe_cpufreq_handle_pmi(pmi_message_t pmi_msg)
-{
-        u8 node; slow_mode;
-
-        BUG_ON(pmi_msg.type != PMI_TYPE_FREQ_CHANGE);
-
-        node = pmi_msg.data1;
-        slow_mode = pmi_msg.data2;
-
-        pmi_slow_mode_limit[node] = slow_mode;
-
-        pr_debug("cbe_handle_pmi: node: %d, max slow_mode=%d\n", slow_mode);
-}
-
-static int pmi_notifier(struct notifier_block *nb,
-                                       unsigned long event, void *data)
-{
-        struct cpufreq_policy *policy = data;
-        u8 node;
-
-        node = cbe_cpu_to_node(policy->cpu);
-
-        pr_debug("got notified, event=%lu, node=%u\n", event, node);
-
-        if (pmi_slow_mode_limit[node] != 0) {
-                pr_debug("limiting node %d to slow mode %d\n",
-                         node, pmi_slow_mode_limit[node]);
-
-                cpufreq_verify_within_limits(policy, 0,
-                         cbe_freqs[pmi_slow_mode_limit[node]].frequency);
-        }
-
-        return 0;
-}
-
-static struct notifier_block pmi_notifier_block = {
-        .notifier_call = pmi_notifier,
-};
-
-static struct pmi_handler cbe_pmi_handler = {
-        .type                   = PMI_TYPE_FREQ_CHANGE,
-        .handle_pmi_message     = cbe_cpufreq_handle_pmi,
-};
-
-
 /*
  * cpufreq functions
  */
@@ -270,7 +103,7 @@ static int cbe_cpufreq_cpu_init(struct cpufreq_policy *policy)
          * of a transition */
         policy->cpuinfo.transition_latency = 25000;
 
-        cur_pmode = get_pmode(policy->cpu);
+        cur_pmode = cbe_cpufreq_get_pmode(policy->cpu);
         pr_debug("current pmode is at %d\n",cur_pmode);
 
         policy->cur = cbe_freqs[cur_pmode].frequency;
@@ -297,7 +130,6 @@ static int cbe_cpufreq_verify(struct cpufreq_policy *policy)
         return cpufreq_frequency_table_verify(policy, cbe_freqs);
 }
 
-
 static int cbe_cpufreq_target(struct cpufreq_policy *policy,
                               unsigned int target_freq,
                               unsigned int relation)
@@ -352,22 +184,12 @@ static int __init cbe_cpufreq_init(void)
         if (!machine_is(cell))
                 return -ENODEV;
 
-        cbe_cpufreq_has_pmi = pmi_register_handler(&cbe_pmi_handler) == 0;
-
-        if (cbe_cpufreq_has_pmi)
-                cpufreq_register_notifier(&pmi_notifier_block, CPUFREQ_POLICY_NOTIFIER);
-
         return cpufreq_register_driver(&cbe_cpufreq_driver);
 }
 
 static void __exit cbe_cpufreq_exit(void)
 {
         cpufreq_unregister_driver(&cbe_cpufreq_driver);
-
-        if (cbe_cpufreq_has_pmi) {
-                cpufreq_unregister_notifier(&pmi_notifier_block, CPUFREQ_POLICY_NOTIFIER);
-                pmi_unregister_handler(&cbe_pmi_handler);
-        }
 }
 
 module_init(cbe_cpufreq_init);
diff --git a/arch/powerpc/platforms/cell/cbe_cpufreq.h b/arch/powerpc/platforms/cell/cbe_cpufreq.h
new file mode 100644
index 000000000000..c1d86bfa92ff
--- /dev/null
+++ b/arch/powerpc/platforms/cell/cbe_cpufreq.h
@@ -0,0 +1,24 @@
+/*
+ * cbe_cpufreq.h
+ *
+ * This file contains the definitions used by the cbe_cpufreq driver.
+ *
+ * (C) Copyright IBM Deutschland Entwicklung GmbH 2005-2007
+ *
+ * Author: Christian Krafft <krafft@de.ibm.com>
+ *
+ */
+
+#include <linux/cpufreq.h>
+#include <linux/types.h>
+
+int cbe_cpufreq_set_pmode(int cpu, unsigned int pmode);
+int cbe_cpufreq_get_pmode(int cpu);
+
+int cbe_cpufreq_set_pmode_pmi(int cpu, unsigned int pmode);
+
+#if defined(CONFIG_CBE_CPUFREQ_PMI) || defined(CONFIG_CBE_CPUFREQ_PMI_MODULE)
+extern bool cbe_cpufreq_has_pmi;
+#else
+#define cbe_cpufreq_has_pmi (0)
+#endif
diff --git a/arch/powerpc/platforms/cell/cbe_cpufreq_pervasive.c b/arch/powerpc/platforms/cell/cbe_cpufreq_pervasive.c
new file mode 100644
index 000000000000..163263b3e1cd
--- /dev/null
+++ b/arch/powerpc/platforms/cell/cbe_cpufreq_pervasive.c
@@ -0,0 +1,115 @@
+/*
+ * pervasive backend for the cbe_cpufreq driver
+ *
+ * This driver makes use of the pervasive unit to
+ * engage the desired frequency.
+ *
+ * (C) Copyright IBM Deutschland Entwicklung GmbH 2005-2007
+ *
+ * Author: Christian Krafft <krafft@de.ibm.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2, or (at your option)
+ * any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include <linux/io.h>
+#include <linux/kernel.h>
+#include <linux/time.h>
+#include <asm/machdep.h>
+#include <asm/hw_irq.h>
+
+#include "cbe_regs.h"
+#include "cbe_cpufreq.h"
+
+/* to write to MIC register */
+static u64 MIC_Slow_Fast_Timer_table[] = {
+        [0 ... 7] = 0x007fc00000000000ull,
+};
+
+/* more values for the MIC */
+static u64 MIC_Slow_Next_Timer_table[] = {
+        0x0000240000000000ull,
+        0x0000268000000000ull,
+        0x000029C000000000ull,
+        0x00002D0000000000ull,
+        0x0000300000000000ull,
+        0x0000334000000000ull,
+        0x000039C000000000ull,
+        0x00003FC000000000ull,
+};
+
+
+int cbe_cpufreq_set_pmode(int cpu, unsigned int pmode)
+{
+        struct cbe_pmd_regs __iomem *pmd_regs;
+        struct cbe_mic_tm_regs __iomem *mic_tm_regs;
+        u64 flags;
+        u64 value;
+#ifdef DEBUG
+        long time;
+#endif
+
+        local_irq_save(flags);
+
+        mic_tm_regs = cbe_get_cpu_mic_tm_regs(cpu);
+        pmd_regs = cbe_get_cpu_pmd_regs(cpu);
+
+#ifdef DEBUG
+        time = jiffies;
+#endif
+
+        out_be64(&mic_tm_regs->slow_fast_timer_0, MIC_Slow_Fast_Timer_table[pmode]);
+        out_be64(&mic_tm_regs->slow_fast_timer_1, MIC_Slow_Fast_Timer_table[pmode]);
+
+        out_be64(&mic_tm_regs->slow_next_timer_0, MIC_Slow_Next_Timer_table[pmode]);
+        out_be64(&mic_tm_regs->slow_next_timer_1, MIC_Slow_Next_Timer_table[pmode]);
+
+        value = in_be64(&pmd_regs->pmcr);
+        /* set bits to zero */
+        value &= 0xFFFFFFFFFFFFFFF8ull;
+        /* set bits to next pmode */
+        value |= pmode;
+
+        out_be64(&pmd_regs->pmcr, value);
+
+#ifdef DEBUG
+        /* wait until new pmode appears in status register */
+        value = in_be64(&pmd_regs->pmsr) & 0x07;
+        while (value != pmode) {
+                cpu_relax();
+                value = in_be64(&pmd_regs->pmsr) & 0x07;
+        }
+
+        time = jiffies  - time;
+        time = jiffies_to_msecs(time);
+        pr_debug("had to wait %lu ms for a transition using " \
+                 "pervasive unit\n", time);
+#endif
+        local_irq_restore(flags);
+
+        return 0;
+}
+
+
+int cbe_cpufreq_get_pmode(int cpu)
+{
+        int ret;
+        struct cbe_pmd_regs __iomem *pmd_regs;
+
+        pmd_regs = cbe_get_cpu_pmd_regs(cpu);
+        ret = in_be64(&pmd_regs->pmsr) & 0x07;
+
+        return ret;
+}
+
diff --git a/arch/powerpc/platforms/cell/cbe_cpufreq_pmi.c b/arch/powerpc/platforms/cell/cbe_cpufreq_pmi.c
new file mode 100644
index 000000000000..fc6f38982ff4
--- /dev/null
+++ b/arch/powerpc/platforms/cell/cbe_cpufreq_pmi.c
@@ -0,0 +1,148 @@
+/*
+ * pmi backend for the cbe_cpufreq driver
+ *
+ * (C) Copyright IBM Deutschland Entwicklung GmbH 2005-2007
+ *
+ * Author: Christian Krafft <krafft@de.ibm.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2, or (at your option)
+ * any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include <linux/kernel.h>
+#include <linux/types.h>
+#include <linux/timer.h>
+#include <asm/of_platform.h>
+#include <asm/processor.h>
+#include <asm/prom.h>
+#include <asm/pmi.h>
+
+#ifdef DEBUG
+#include <asm/time.h>
+#endif
+
+#include "cbe_regs.h"
+#include "cbe_cpufreq.h"
+
+static u8 pmi_slow_mode_limit[MAX_CBE];
+
+bool cbe_cpufreq_has_pmi = false;
+EXPORT_SYMBOL_GPL(cbe_cpufreq_has_pmi);
+
+/*
+ * hardware specific functions
+ */
+
+int cbe_cpufreq_set_pmode_pmi(int cpu, unsigned int pmode)
+{
+        int ret;
+        pmi_message_t pmi_msg;
+#ifdef DEBUG
+        long time;
+#endif
+        pmi_msg.type = PMI_TYPE_FREQ_CHANGE;
+        pmi_msg.data1 = cbe_cpu_to_node(cpu);
+        pmi_msg.data2 = pmode;
+
+#ifdef DEBUG
+        time = jiffies;
+#endif
+        pmi_send_message(pmi_msg);
+
+#ifdef DEBUG
+        time = jiffies  - time;
+        time = jiffies_to_msecs(time);
+        pr_debug("had to wait %lu ms for a transition using " \
+                 "PMI\n", time);
+#endif
+        ret = pmi_msg.data2;
+        pr_debug("PMI returned slow mode %d\n", ret);
+
+        return ret;
+}
+EXPORT_SYMBOL_GPL(cbe_cpufreq_set_pmode_pmi);
+
+
+static void cbe_cpufreq_handle_pmi(pmi_message_t pmi_msg)
+{
+        u8 node, slow_mode;
+
+        BUG_ON(pmi_msg.type != PMI_TYPE_FREQ_CHANGE);
+
+        node = pmi_msg.data1;
+        slow_mode = pmi_msg.data2;
+
+        pmi_slow_mode_limit[node] = slow_mode;
+
+        pr_debug("cbe_handle_pmi: node: %d max_freq: %d\n", node, slow_mode);
+}
+
+static int pmi_notifier(struct notifier_block *nb,
+                                       unsigned long event, void *data)
+{
+        struct cpufreq_policy *policy = data;
+        struct cpufreq_frequency_table *cbe_freqs;
+        u8 node;
+
+        cbe_freqs = cpufreq_frequency_get_table(policy->cpu);
+        node = cbe_cpu_to_node(policy->cpu);
+
+        pr_debug("got notified, event=%lu, node=%u\n", event, node);
+
+        if (pmi_slow_mode_limit[node] != 0) {
+                pr_debug("limiting node %d to slow mode %d\n",
+                         node, pmi_slow_mode_limit[node]);
+
+                cpufreq_verify_within_limits(policy, 0,
+
+                        cbe_freqs[pmi_slow_mode_limit[node]].frequency);
+        }
+
+        return 0;
+}
+
+static struct notifier_block pmi_notifier_block = {
+        .notifier_call = pmi_notifier,
+};
+
+static struct pmi_handler cbe_pmi_handler = {
+        .type                   = PMI_TYPE_FREQ_CHANGE,
+        .handle_pmi_message     = cbe_cpufreq_handle_pmi,
+};
+
+
+
+static int __init cbe_cpufreq_pmi_init(void)
+{
+        cbe_cpufreq_has_pmi = pmi_register_handler(&cbe_pmi_handler) == 0;
+
+        if (!cbe_cpufreq_has_pmi)
+                return -ENODEV;
+
+        cpufreq_register_notifier(&pmi_notifier_block, CPUFREQ_POLICY_NOTIFIER);
+
+        return 0;
+}
+
+static void __exit cbe_cpufreq_pmi_exit(void)
+{
+        cpufreq_unregister_notifier(&pmi_notifier_block, CPUFREQ_POLICY_NOTIFIER);
+        pmi_unregister_handler(&cbe_pmi_handler);
+}
+
+module_init(cbe_cpufreq_pmi_init);
+module_exit(cbe_cpufreq_pmi_exit);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Christian Krafft <krafft@de.ibm.com>");