/*
* RCPM(Run Control/Power Management) support
*
* Copyright 2012-2015 Freescale Semiconductor Inc.
*
* Author: Chenhui Zhao <chenhui.zhao@freescale.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 of the License, or (at your
* option) any later version.
*/
#define pr_fmt(fmt) "%s: " fmt, __func__
#include <linux/types.h>
#include <linux/errno.h>
#include <linux/of_address.h>
#include <linux/export.h>
#include <asm/io.h>
#include <linux/fsl/guts.h>
#include <asm/cputhreads.h>
#include <asm/fsl_pm.h>
#include <asm/smp.h>
static struct ccsr_rcpm_v1 __iomem *rcpm_v1_regs;
static struct ccsr_rcpm_v2 __iomem *rcpm_v2_regs;
static unsigned int fsl_supported_pm_modes;
static void rcpm_v1_irq_mask(int cpu)
{
int hw_cpu = get_hard_smp_processor_id(cpu);
unsigned int mask = 1 << hw_cpu;
setbits32(&rcpm_v1_regs->cpmimr, mask);
setbits32(&rcpm_v1_regs->cpmcimr, mask);
setbits32(&rcpm_v1_regs->cpmmcmr, mask);
setbits32(&rcpm_v1_regs->cpmnmimr, mask);
}
static void rcpm_v2_irq_mask(int cpu)
{
int hw_cpu = get_hard_smp_processor_id(cpu);
unsigned int mask = 1 << hw_cpu;
setbits32(&rcpm_v2_regs->tpmimr0, mask);
setbits32(&rcpm_v2_regs->tpmcimr0, mask);
setbits32(&rcpm_v2_regs->tpmmcmr0, mask);
setbits32(&rcpm_v2_regs->tpmnmimr0, mask);
}
static void rcpm_v1_irq_unmask(int cpu)
{
int hw_cpu = get_hard_smp_processor_id(cpu);
unsigned int mask = 1 << hw_cpu;
clrbits32(&rcpm_v1_regs->cpmimr, mask);
clrbits32(&rcpm_v1_regs->cpmcimr, mask);
clrbits32(&rcpm_v1_regs->cpmmcmr, mask);
clrbits32(&rcpm_v1_regs->cpmnmimr, mask);
}
static void rcpm_v2_irq_unmask(int cpu)
{
int hw_cpu = get_hard_smp_processor_id(cpu);
unsigned int mask = 1 << hw_cpu;
clrbits32(&rcpm_v2_regs->tpmimr0, mask);
clrbits32(&rcpm_v2_regs->tpmcimr0, mask);
clrbits32(&rcpm_v2_regs->tpmmcmr0, mask);
clrbits32(&rcpm_v2_regs->tpmnmimr0, mask);
}
static void rcpm_v1_set_ip_power(bool enable, u32 mask)
{
if (enable)
setbits32(&rcpm_v1_regs->ippdexpcr, mask);
else
clrbits32(&rcpm_v1_regs->ippdexpcr, mask);
}
static void rcpm_v2_set_ip_power(bool enable, u32 mask)
{
if (enable)
setbits32(&rcpm_v2_regs->ippdexpcr[0], mask);
else
clrbits32(&rcpm_v2_regs->ippdexpcr[0], mask);
}
static void rcpm_v1_cpu_enter_state(int cpu, int state)
{
int hw_cpu = get_hard_smp_processor_id(cpu);
unsigned int mask = 1 << hw_cpu;
switch (state) {
case E500_PM_PH10:
setbits32(&rcpm_v1_regs->cdozcr, mask);
break;
case E500_PM_PH15:
setbits32(&rcpm_v1_regs->cnapcr, mask);
break;
default:
pr_warn("Unknown cpu PM state (%d)\n", state);
break;
}
}
static void rcpm_v2_cpu_enter_state(int cpu, int state)
{
int hw_cpu = get_hard_smp_processor_id(cpu);
u32 mask = 1 << cpu_core_index_of_thread(cpu);
switch (state) {
case E500_PM_PH10:
/* one bit corresponds to one thread for PH10 of 6500 */
setbits32(&rcpm_v2_regs->tph10setr0, 1 << hw_cpu);
break;
case E500_PM_PH15:
setbits32(&rcpm_v2_regs->pcph15setr, mask);
break;
case E500_PM_PH20:
setbits32(&rcpm_v2_regs->pcph20setr, mask);
break;
case E500_PM_PH30:
setbits32(&rcpm_v2_regs->pcph30setr, mask);
break;
default:
pr_warn("Unknown cpu PM state (%d)\n", state);
}
}
static void rcpm_v1_cpu_die(int cpu)
{
rcpm_v1_cpu_enter_state(cpu, E500_PM_PH15);
}
#ifdef CONFIG_PPC64
static void qoriq_disable_thread(int cpu)
{
int thread = cpu_thread_in_core(cpu);
book3e_stop_thread(thread);
}
#endif
static void rcpm_v2_cpu_die(int cpu)
{
#ifdef CONFIG_PPC64
int primary;
if (threads_per_core == 2) {
primary = cpu_first_thread_sibling(cpu);
if (cpu_is_offline(primary) && cpu_is_offline(primary + 1)) {
/* if both threads are offline, put the cpu in PH20 */
rcpm_v2_cpu_enter_state(cpu, E500_PM_PH20);
} else {
/* if only one thread is offline, disable the thread */
qoriq_disable_thread(cpu);
}
}
#endif
if (threads_per_core == 1)
rcpm_v2_cpu_enter_state(cpu, E500_PM_PH20);
}
static void rcpm_v1_cpu_exit_state(int cpu, int state)
{
int hw_cpu = get_hard_smp_processor_id(cpu);
unsigned int mask = 1 << hw_cpu;
switch (state) {
case E500_PM_PH10:
clrbits32(&rcpm_v1_regs->cdozcr, mask);
break;
case E500_PM_PH15:
clrbits32(&rcpm_v1_regs->cnapcr, mask);
break;
default:
pr_warn("Unknown cpu PM state (%d)\n", state);
break;
}
}
static void rcpm_v1_cpu_up_prepare(int cpu)
{
rcpm_v1_cpu_exit_state(cpu, E500_PM_PH15);
rcpm_v1_irq_unmask(cpu);
}
static void rcpm_v2_cpu_exit_state(int cpu, int state)
{
int hw_cpu = get_hard_smp_processor_id(cpu);
u32 mask = 1 << cpu_core_index_of_thread(cpu);
switch (state) {
case E500_PM_PH10:
setbits32(&rcpm_v2_regs->tph10clrr0, 1 << hw_cpu);
break;
case E500_PM_PH15:
setbits32(&rcpm_v2_regs->pcph15clrr, mask);
break;
case E500_PM_PH20:
setbits32(&rcpm_v2_regs->pcph20clrr, mask);
break;
case E500_PM_PH30:
setbits32(&rcpm_v2_regs->pcph30clrr, mask);
break;
default:
pr_warn("Unknown cpu PM state (%d)\n", state);
}
}
static void rcpm_v2_cpu_up_prepare(int cpu)
{
rcpm_v2_cpu_exit_state(cpu, E500_PM_PH20);
rcpm_v2_irq_unmask(cpu);
}
static int rcpm_v1_plat_enter_state(int state)
{
u32 *pmcsr_reg = &rcpm_v1_regs->powmgtcsr;
int ret = 0;
int result;
switch (state) {
case PLAT_PM_SLEEP:
setbits32(pmcsr_reg, RCPM_POWMGTCSR_SLP);
/* Upon resume, wait for RCPM_POWMGTCSR_SLP bit to be clear. */
result = spin_event_timeout(
!(in_be32(pmcsr_reg) & RCPM_POWMGTCSR_SLP), 10000, 10);
if (!result) {
pr_err("timeout waiting for SLP bit to be cleared\n");
ret = -ETIMEDOUT;
}
break;
default:
pr_warn("Unknown platform PM state (%d)", state);
ret = -EINVAL;
}
return ret;
}
static int rcpm_v2_plat_enter_state(int state)
{
u32 *pmcsr_reg = &rcpm_v2_regs->powmgtcsr;
int ret = 0;
int result;
switch (state) {
case PLAT_PM_LPM20:
/* clear previous LPM20 status */
setbits32(pmcsr_reg, RCPM_POWMGTCSR_P_LPM20_ST);
/* enter LPM20 status */
setbits32(pmcsr_reg, RCPM_POWMGTCSR_LPM20_RQ);
/* At this point, the device is in LPM20 status. */
/* resume ... */
result = spin_event_timeout(
!(in_be32(pmcsr_reg) & RCPM_POWMGTCSR_LPM20_ST), 10000, 10);
if (!result) {
pr_err("timeout waiting for LPM20 bit to be cleared\n");
ret = -ETIMEDOUT;
}
break;
default:
pr_warn("Unknown platform PM state (%d)\n", state);
ret = -EINVAL;
}
return ret;
}
static int rcpm_v1_plat_enter_sleep(void)
{
return rcpm_v1_plat_enter_state(PLAT_PM_SLEEP);
}
static int rcpm_v2_plat_enter_sleep(void)
{
return rcpm_v2_plat_enter_state(PLAT_PM_LPM20);
}
static void rcpm_common_freeze_time_base(u32 *tben_reg, int freeze)
{
static u32 mask;
if (freeze) {
mask = in_be32(tben_reg);
clrbits32(tben_reg, mask);
} else {
setbits32(tben_reg, mask);
}
/* read back to push the previous write */
in_be32(tben_reg);
}
static void rcpm_v1_freeze_time_base(bool freeze)
{
rcpm_common_freeze_time_base(&rcpm_v1_regs->ctbenr, freeze);
}
static void rcpm_v2_freeze_time_base(bool freeze)
{
rcpm_common_freeze_time_base(&rcpm_v2_regs->pctbenr, freeze);
}
static unsigned int rcpm_get_pm_modes(void)
{
return fsl_supported_pm_modes;
}
static const struct fsl_pm_ops qoriq_rcpm_v1_ops = {
.irq_mask = rcpm_v1_irq_mask,
.irq_unmask = rcpm_v1_irq_unmask,
.cpu_enter_state = rcpm_v1_cpu_enter_state,
.cpu_exit_state = rcpm_v1_cpu_exit_state,
.cpu_up_prepare = rcpm_v1_cpu_up_prepare,
.cpu_die = rcpm_v1_cpu_die,
.plat_enter_sleep = rcpm_v1_plat_enter_sleep,
.set_ip_power = rcpm_v1_set_ip_power,
.freeze_time_base = rcpm_v1_freeze_time_base,
.get_pm_modes = rcpm_get_pm_modes,
};
static const struct fsl_pm_ops qoriq_rcpm_v2_ops = {
.irq_mask = rcpm_v2_irq_mask,
.irq_unmask = rcpm_v2_irq_unmask,
.cpu_enter_state = rcpm_v2_cpu_enter_state,
.cpu_exit_state = rcpm_v2_cpu_exit_state,
.cpu_up_prepare = rcpm_v2_cpu_up_prepare,
.cpu_die = rcpm_v2_cpu_die,
.plat_enter_sleep = rcpm_v2_plat_enter_sleep,
.set_ip_power = rcpm_v2_set_ip_power,
.freeze_time_base = rcpm_v2_freeze_time_base,
.get_pm_modes = rcpm_get_pm_modes,
};
static const struct of_device_id rcpm_matches[] = {
{
.compatible = "fsl,qoriq-rcpm-1.0",
.data = &qoriq_rcpm_v1_ops,
},
{
.compatible = "fsl,qoriq-rcpm-2.0",
.data = &qoriq_rcpm_v2_ops,
},
{
.compatible = "fsl,qoriq-rcpm-2.1",
.data = &qoriq_rcpm_v2_ops,
},
{},
};
int __init fsl_rcpm_init(void)
{
struct device_node *np;
const struct of_device_id *match;
void __iomem *base;
np = of_find_matching_node_and_match(NULL, rcpm_matches, &match);
if (!np)
return 0;
base = of_iomap(np, 0);
of_node_put(np);
if (!base) {
pr_err("of_iomap() error.\n");
return -ENOMEM;
}
rcpm_v1_regs = base;
rcpm_v2_regs = base;
/* support sleep by default */
fsl_supported_pm_modes = FSL_PM_SLEEP;
qoriq_pm_ops = match->data;
return 0;
}
