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cpufreq: ppc_cbe: Remove powerpc Cell driver 

This driver can no longer be built since support for IBM Cell Blades was
removed, in particular CBE_RAS.

Remove the driver.

Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Signed-off-by: Madhavan Srinivasan <maddy@linux.ibm.com>
Link: https://patch.msgid.link/20241218105523.416573-22-mpe@ellerman.id.au
pull/1188/head
Michael Ellerman 2024-12-18 21:55:10 +11:00 committed by Madhavan Srinivasan
parent 333e8eb3e0
commit 16479389cf
6 changed files with 0 additions and 479 deletions
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18
drivers/cpufreq/Kconfig.powerpc
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@ -1,22 +1,4 @@
# SPDX-License-Identifier: GPL-2.0-only
config CPU_FREQ_CBE
tristate "CBE frequency scaling"
depends on CBE_RAS && PPC_CELL
default m
help
This adds the cpufreq driver for Cell BE processors.
For details, take a look at <file:Documentation/cpu-freq/>.
If you don't have such processor, say N
config CPU_FREQ_CBE_PMI
bool "CBE frequency scaling using PMI interface"
depends on CPU_FREQ_CBE
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.
config CPU_FREQ_PMAC
bool "Support for Apple PowerBooks"
depends on ADB_PMU && PPC32

3
drivers/cpufreq/Makefile
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@ -91,9 +91,6 @@ obj-$(CONFIG_ARM_VEXPRESS_SPC_CPUFREQ) += vexpress-spc-cpufreq.o
##################################################################################
# PowerPC platform drivers
obj-$(CONFIG_CPU_FREQ_CBE) += ppc-cbe-cpufreq.o
ppc-cbe-cpufreq-y += ppc_cbe_cpufreq_pervasive.o ppc_cbe_cpufreq.o
obj-$(CONFIG_CPU_FREQ_CBE_PMI) += ppc_cbe_cpufreq_pmi.o
obj-$(CONFIG_QORIQ_CPUFREQ) += qoriq-cpufreq.o
obj-$(CONFIG_CPU_FREQ_PMAC) += pmac32-cpufreq.o
obj-$(CONFIG_CPU_FREQ_PMAC64) += pmac64-cpufreq.o

173
drivers/cpufreq/ppc_cbe_cpufreq.c
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@ -1,173 +0,0 @@
// SPDX-License-Identifier: GPL-2.0-or-later
/*
* cpufreq driver for the cell processor
*
* (C) Copyright IBM Deutschland Entwicklung GmbH 2005-2007
*
* Author: Christian Krafft <krafft@de.ibm.com>
*/
#include <linux/cpufreq.h>
#include <linux/module.h>
#include <linux/of.h>
#include <asm/machdep.h>
#include <asm/cell-regs.h>
#include "ppc_cbe_cpufreq.h"
/* the CBE supports an 8 step frequency scaling */
static struct cpufreq_frequency_table cbe_freqs[] = {
{0, 1, 0},
{0, 2, 0},
{0, 3, 0},
{0, 4, 0},
{0, 5, 0},
{0, 6, 0},
{0, 8, 0},
{0, 10, 0},
{0, 0, CPUFREQ_TABLE_END},
};
/*
* hardware specific functions
*/
static int set_pmode(unsigned int cpu, unsigned int slow_mode)
{
int rc;
if (cbe_cpufreq_has_pmi)
rc = cbe_cpufreq_set_pmode_pmi(cpu, slow_mode);
else
rc = cbe_cpufreq_set_pmode(cpu, slow_mode);
pr_debug("register contains slow mode %d\n", cbe_cpufreq_get_pmode(cpu));
return rc;
}
/*
* cpufreq functions
*/
static int cbe_cpufreq_cpu_init(struct cpufreq_policy *policy)
{
struct cpufreq_frequency_table *pos;
const u32 *max_freqp;
u32 max_freq;
int cur_pmode;
struct device_node *cpu;
cpu = of_get_cpu_node(policy->cpu, NULL);
if (!cpu)
return -ENODEV;
pr_debug("init cpufreq on CPU %d\n", policy->cpu);
/*
* Let's check we can actually get to the CELL regs
*/
if (!cbe_get_cpu_pmd_regs(policy->cpu) ||
!cbe_get_cpu_mic_tm_regs(policy->cpu)) {
pr_info("invalid CBE regs pointers for cpufreq\n");
of_node_put(cpu);
return -EINVAL;
}
max_freqp = of_get_property(cpu, "clock-frequency", NULL);
of_node_put(cpu);
if (!max_freqp)
return -EINVAL;
/* we need the freq in kHz */
max_freq = *max_freqp / 1000;
pr_debug("max clock-frequency is at %u kHz\n", max_freq);
pr_debug("initializing frequency table\n");
/* initialize frequency table */
cpufreq_for_each_entry(pos, cbe_freqs) {
pos->frequency = max_freq / pos->driver_data;
pr_debug("%d: %d\n", (int)(pos - cbe_freqs), pos->frequency);
}
/* if DEBUG is enabled set_pmode() measures the latency
* of a transition */
policy->cpuinfo.transition_latency = 25000;
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;
#ifdef CONFIG_SMP
cpumask_copy(policy->cpus, cpu_sibling_mask(policy->cpu));
#endif
policy->freq_table = cbe_freqs;
cbe_cpufreq_pmi_policy_init(policy);
return 0;
}
static void cbe_cpufreq_cpu_exit(struct cpufreq_policy *policy)
{
cbe_cpufreq_pmi_policy_exit(policy);
}
static int cbe_cpufreq_target(struct cpufreq_policy *policy,
unsigned int cbe_pmode_new)
{
pr_debug("setting frequency for cpu %d to %d kHz, " \
"1/%d of max frequency\n",
policy->cpu,
cbe_freqs[cbe_pmode_new].frequency,
cbe_freqs[cbe_pmode_new].driver_data);
return set_pmode(policy->cpu, cbe_pmode_new);
}
static struct cpufreq_driver cbe_cpufreq_driver = {
.verify = cpufreq_generic_frequency_table_verify,
.target_index = cbe_cpufreq_target,
.init = cbe_cpufreq_cpu_init,
.exit = cbe_cpufreq_cpu_exit,
.name = "cbe-cpufreq",
.flags = CPUFREQ_CONST_LOOPS,
};
/*
* module init and destoy
*/
static int __init cbe_cpufreq_init(void)
{
int ret;
if (!machine_is(cell))
return -ENODEV;
cbe_cpufreq_pmi_init();
ret = cpufreq_register_driver(&cbe_cpufreq_driver);
if (ret)
cbe_cpufreq_pmi_exit();
return ret;
}
static void __exit cbe_cpufreq_exit(void)
{
cpufreq_unregister_driver(&cbe_cpufreq_driver);
cbe_cpufreq_pmi_exit();
}
module_init(cbe_cpufreq_init);
module_exit(cbe_cpufreq_exit);
MODULE_DESCRIPTION("cpufreq driver for Cell BE processors");
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Christian Krafft <krafft@de.ibm.com>");

33
drivers/cpufreq/ppc_cbe_cpufreq.h
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@ -1,33 +0,0 @@
/* SPDX-License-Identifier: GPL-2.0 */
/*
* ppc_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 IS_ENABLED(CONFIG_CPU_FREQ_CBE_PMI)
extern bool cbe_cpufreq_has_pmi;
void cbe_cpufreq_pmi_policy_init(struct cpufreq_policy *policy);
void cbe_cpufreq_pmi_policy_exit(struct cpufreq_policy *policy);
void cbe_cpufreq_pmi_init(void);
void cbe_cpufreq_pmi_exit(void);
#else
#define cbe_cpufreq_has_pmi (0)
static inline void cbe_cpufreq_pmi_policy_init(struct cpufreq_policy *policy) {}
static inline void cbe_cpufreq_pmi_policy_exit(struct cpufreq_policy *policy) {}
static inline void cbe_cpufreq_pmi_init(void) {}
static inline void cbe_cpufreq_pmi_exit(void) {}
#endif

102
drivers/cpufreq/ppc_cbe_cpufreq_pervasive.c
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@ -1,102 +0,0 @@
// SPDX-License-Identifier: GPL-2.0-or-later
/*
* 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>
*/
#include <linux/io.h>
#include <linux/kernel.h>
#include <linux/time.h>
#include <asm/machdep.h>
#include <asm/hw_irq.h>
#include <asm/cell-regs.h>
#include "ppc_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;
unsigned long 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;
}

150
drivers/cpufreq/ppc_cbe_cpufreq_pmi.c
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@ -1,150 +0,0 @@
// SPDX-License-Identifier: GPL-2.0-or-later
/*
* pmi backend for the cbe_cpufreq driver
*
* (C) Copyright IBM Deutschland Entwicklung GmbH 2005-2007
*
* Author: Christian Krafft <krafft@de.ibm.com>
*/
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/timer.h>
#include <linux/init.h>
#include <linux/pm_qos.h>
#include <linux/slab.h>
#include <asm/processor.h>
#include <asm/pmi.h>
#include <asm/cell-regs.h>
#ifdef DEBUG
#include <asm/time.h>
#endif
#include "ppc_cbe_cpufreq.h"
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)
{
struct cpufreq_policy *policy;
struct freq_qos_request *req;
u8 node, slow_mode;
int cpu, ret;
BUG_ON(pmi_msg.type != PMI_TYPE_FREQ_CHANGE);
node = pmi_msg.data1;
slow_mode = pmi_msg.data2;
cpu = cbe_node_to_cpu(node);
pr_debug("cbe_handle_pmi: node: %d max_freq: %d\n", node, slow_mode);
policy = cpufreq_cpu_get(cpu);
if (!policy) {
pr_warn("cpufreq policy not found cpu%d\n", cpu);
return;
}
req = policy->driver_data;
ret = freq_qos_update_request(req,
policy->freq_table[slow_mode].frequency);
if (ret < 0)
pr_warn("Failed to update freq constraint: %d\n", ret);
else
pr_debug("limiting node %d to slow mode %d\n", node, slow_mode);
cpufreq_cpu_put(policy);
}
static struct pmi_handler cbe_pmi_handler = {
.type = PMI_TYPE_FREQ_CHANGE,
.handle_pmi_message = cbe_cpufreq_handle_pmi,
};
void cbe_cpufreq_pmi_policy_init(struct cpufreq_policy *policy)
{
struct freq_qos_request *req;
int ret;
if (!cbe_cpufreq_has_pmi)
return;
req = kzalloc(sizeof(*req), GFP_KERNEL);
if (!req)
return;
ret = freq_qos_add_request(&policy->constraints, req, FREQ_QOS_MAX,
policy->freq_table[0].frequency);
if (ret < 0) {
pr_err("Failed to add freq constraint (%d)\n", ret);
kfree(req);
return;
}
policy->driver_data = req;
}
EXPORT_SYMBOL_GPL(cbe_cpufreq_pmi_policy_init);
void cbe_cpufreq_pmi_policy_exit(struct cpufreq_policy *policy)
{
struct freq_qos_request *req = policy->driver_data;
if (cbe_cpufreq_has_pmi) {
freq_qos_remove_request(req);
kfree(req);
}
}
EXPORT_SYMBOL_GPL(cbe_cpufreq_pmi_policy_exit);
void cbe_cpufreq_pmi_init(void)
{
if (!pmi_register_handler(&cbe_pmi_handler))
cbe_cpufreq_has_pmi = true;
}
EXPORT_SYMBOL_GPL(cbe_cpufreq_pmi_init);
void cbe_cpufreq_pmi_exit(void)
{
pmi_unregister_handler(&cbe_pmi_handler);
cbe_cpufreq_has_pmi = false;
}
EXPORT_SYMBOL_GPL(cbe_cpufreq_pmi_exit);