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/*
* Copyright (c) 2013-2017, ARM Limited and Contributors. All rights reserved.
*
* SPDX-License-Identifier: BSD-3-Clause
*/
/*
* APU specific definition of processors in the subsystem as well as functions
* for getting information about and changing state of the APU.
*/
#include <assert.h>
#include <bakery_lock.h>
#include <bl_common.h>
#include <gic_common.h>
#include <gicv2.h>
#include <mmio.h>
#include <string.h>
#include <utils.h>
#include "../zynqmp_def.h"
#include "pm_api_sys.h"
#include "pm_client.h"
#include "pm_ipi.h"
#define IRQ_MAX 84
#define NUM_GICD_ISENABLER ((IRQ_MAX >> 5) + 1)
#define UNDEFINED_CPUID (~0)
DEFINE_BAKERY_LOCK(pm_client_secure_lock);
extern const struct pm_ipi apu_ipi;
/* Order in pm_procs_all array must match cpu ids */
static const struct pm_proc pm_procs_all[] = {
{
.node_id = NODE_APU_0,
.pwrdn_mask = APU_0_PWRCTL_CPUPWRDWNREQ_MASK,
.ipi = &apu_ipi,
},
{
.node_id = NODE_APU_1,
.pwrdn_mask = APU_1_PWRCTL_CPUPWRDWNREQ_MASK,
.ipi = &apu_ipi,
},
{
.node_id = NODE_APU_2,
.pwrdn_mask = APU_2_PWRCTL_CPUPWRDWNREQ_MASK,
.ipi = &apu_ipi,
},
{
.node_id = NODE_APU_3,
.pwrdn_mask = APU_3_PWRCTL_CPUPWRDWNREQ_MASK,
.ipi = &apu_ipi,
},
};
/* Interrupt to PM node ID map */
static enum pm_node_id irq_node_map[IRQ_MAX + 1] = {
NODE_UNKNOWN,
NODE_UNKNOWN,
NODE_UNKNOWN,
NODE_UNKNOWN, /* 3 */
NODE_UNKNOWN,
NODE_UNKNOWN,
NODE_UNKNOWN,
NODE_UNKNOWN, /* 7 */
NODE_UNKNOWN,
NODE_UNKNOWN,
NODE_UNKNOWN,
NODE_UNKNOWN, /* 11 */
NODE_UNKNOWN,
NODE_UNKNOWN,
NODE_NAND,
NODE_QSPI, /* 15 */
NODE_GPIO,
NODE_I2C_0,
NODE_I2C_1,
NODE_SPI_0, /* 19 */
NODE_SPI_1,
NODE_UART_0,
NODE_UART_1,
NODE_CAN_0, /* 23 */
NODE_CAN_1,
NODE_UNKNOWN,
NODE_RTC,
NODE_RTC, /* 27 */
NODE_UNKNOWN,
NODE_UNKNOWN,
NODE_UNKNOWN,
NODE_UNKNOWN, /* 31 */
NODE_UNKNOWN,
NODE_UNKNOWN,
NODE_UNKNOWN,
NODE_UNKNOWN, /* 35, NODE_IPI_APU */
NODE_TTC_0,
NODE_TTC_0,
NODE_TTC_0,
NODE_TTC_1, /* 39 */
NODE_TTC_1,
NODE_TTC_1,
NODE_TTC_2,
NODE_TTC_2, /* 43 */
NODE_TTC_2,
NODE_TTC_3,
NODE_TTC_3,
NODE_TTC_3, /* 47 */
NODE_SD_0,
NODE_SD_1,
NODE_SD_0,
NODE_SD_1, /* 51 */
NODE_UNKNOWN,
NODE_UNKNOWN,
NODE_UNKNOWN,
NODE_UNKNOWN, /* 55 */
NODE_UNKNOWN,
NODE_ETH_0,
NODE_ETH_0,
NODE_ETH_1, /* 59 */
NODE_ETH_1,
NODE_ETH_2,
NODE_ETH_2,
NODE_ETH_3, /* 63 */
NODE_ETH_3,
NODE_USB_0,
NODE_USB_0,
NODE_USB_0, /* 67 */
NODE_USB_0,
NODE_USB_0,
NODE_USB_1,
NODE_USB_1, /* 71 */
NODE_USB_1,
NODE_USB_1,
NODE_USB_1,
NODE_USB_0, /* 75 */
NODE_USB_0,
NODE_ADMA,
NODE_ADMA,
NODE_ADMA, /* 79 */
NODE_ADMA,
NODE_ADMA,
NODE_ADMA,
NODE_ADMA, /* 83 */
NODE_ADMA,
};
/**
* irq_to_pm_node - Get PM node ID corresponding to the interrupt number
* @irq: Interrupt number
*
* Return: PM node ID corresponding to the specified interrupt
*/
static enum pm_node_id irq_to_pm_node(unsigned int irq)
{
assert(irq <= IRQ_MAX);
return irq_node_map[irq];
}
/**
* pm_client_set_wakeup_sources - Set all slaves with enabled interrupts as wake
* sources in the PMU firmware
*/
static void pm_client_set_wakeup_sources(void)
{
uint32_t reg_num;
uint8_t pm_wakeup_nodes_set[NODE_MAX];
uintptr_t isenabler1 = BASE_GICD_BASE + GICD_ISENABLER + 4;
zeromem(&pm_wakeup_nodes_set, sizeof(pm_wakeup_nodes_set));
for (reg_num = 0; reg_num < NUM_GICD_ISENABLER; reg_num++) {
uint32_t base_irq = reg_num << ISENABLER_SHIFT;
uint32_t reg = mmio_read_32(isenabler1 + (reg_num << 2));
if (!reg)
continue;
while (reg) {
enum pm_node_id node;
uint32_t idx, ret, irq, lowest_set = reg & (-reg);
idx = __builtin_ctz(lowest_set);
irq = base_irq + idx;
if (irq > IRQ_MAX)
break;
node = irq_to_pm_node(irq);
reg &= ~lowest_set;
if ((node != NODE_UNKNOWN) &&
(!pm_wakeup_nodes_set[node])) {
ret = pm_set_wakeup_source(NODE_APU, node, 1);
pm_wakeup_nodes_set[node] = !ret;
}
}
}
}
/**
* pm_get_proc() - returns pointer to the proc structure
* @cpuid: id of the cpu whose proc struct pointer should be returned
*
* Return: pointer to a proc structure if proc is found, otherwise NULL
*/
const struct pm_proc *pm_get_proc(unsigned int cpuid)
{
if (cpuid < ARRAY_SIZE(pm_procs_all))
return &pm_procs_all[cpuid];
return NULL;
}
/**
* pm_get_proc_by_node() - returns pointer to the proc structure
* @nid: node id of the processor
*
* Return: pointer to a proc structure if proc is found, otherwise NULL
*/
const struct pm_proc *pm_get_proc_by_node(enum pm_node_id nid)
{
for (size_t i = 0; i < ARRAY_SIZE(pm_procs_all); i++) {
if (nid == pm_procs_all[i].node_id)
return &pm_procs_all[i];
}
return NULL;
}
/**
* pm_get_cpuid() - get the local cpu ID for a global node ID
* @nid: node id of the processor
*
* Return: the cpu ID (starting from 0) for the subsystem
*/
static unsigned int pm_get_cpuid(enum pm_node_id nid)
{
for (size_t i = 0; i < ARRAY_SIZE(pm_procs_all); i++) {
if (pm_procs_all[i].node_id == nid)
return i;
}
return UNDEFINED_CPUID;
}
const struct pm_proc *primary_proc = &pm_procs_all[0];
/**
* pm_client_suspend() - Client-specific suspend actions
*
* This function should contain any PU-specific actions
* required prior to sending suspend request to PMU
* Actions taken depend on the state system is suspending to.
*/
void pm_client_suspend(const struct pm_proc *proc, unsigned int state)
{
bakery_lock_get(&pm_client_secure_lock);
if (state == PM_STATE_SUSPEND_TO_RAM)
pm_client_set_wakeup_sources();
/* Set powerdown request */
mmio_write_32(APU_PWRCTL, mmio_read_32(APU_PWRCTL) | proc->pwrdn_mask);
bakery_lock_release(&pm_client_secure_lock);
}
/**
* pm_client_abort_suspend() - Client-specific abort-suspend actions
*
* This function should contain any PU-specific actions
* required for aborting a prior suspend request
*/
void pm_client_abort_suspend(void)
{
/* Enable interrupts at processor level (for current cpu) */
gicv2_cpuif_enable();
bakery_lock_get(&pm_client_secure_lock);
/* Clear powerdown request */
mmio_write_32(APU_PWRCTL,
mmio_read_32(APU_PWRCTL) & ~primary_proc->pwrdn_mask);
bakery_lock_release(&pm_client_secure_lock);
}
/**
* pm_client_wakeup() - Client-specific wakeup actions
*
* This function should contain any PU-specific actions
* required for waking up another APU core
*/
void pm_client_wakeup(const struct pm_proc *proc)
{
unsigned int cpuid = pm_get_cpuid(proc->node_id);
if (cpuid == UNDEFINED_CPUID)
return;
bakery_lock_get(&pm_client_secure_lock);
/* clear powerdown bit for affected cpu */
uint32_t val = mmio_read_32(APU_PWRCTL);
val &= ~(proc->pwrdn_mask);
mmio_write_32(APU_PWRCTL, val);
bakery_lock_release(&pm_client_secure_lock);
}
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