603 lines
15 KiB
C
603 lines
15 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
|
|
/*
|
|
* Copyright 2017 NXP
|
|
* Copyright 2011,2016 Freescale Semiconductor, Inc.
|
|
* Copyright 2011 Linaro Ltd.
|
|
*/
|
|
|
|
#include <linux/clk.h>
|
|
#include <linux/hrtimer.h>
|
|
#include <linux/init.h>
|
|
#include <linux/interrupt.h>
|
|
#include <linux/io.h>
|
|
#include <linux/module.h>
|
|
#include <linux/of.h>
|
|
#include <linux/of_address.h>
|
|
#include <linux/of_device.h>
|
|
#include <linux/perf_event.h>
|
|
#include <linux/slab.h>
|
|
|
|
#include "common.h"
|
|
|
|
#define MMDC_MAPSR 0x404
|
|
#define BP_MMDC_MAPSR_PSD 0
|
|
#define BP_MMDC_MAPSR_PSS 4
|
|
|
|
#define MMDC_MDMISC 0x18
|
|
#define BM_MMDC_MDMISC_DDR_TYPE 0x18
|
|
#define BP_MMDC_MDMISC_DDR_TYPE 0x3
|
|
|
|
#define TOTAL_CYCLES 0x0
|
|
#define BUSY_CYCLES 0x1
|
|
#define READ_ACCESSES 0x2
|
|
#define WRITE_ACCESSES 0x3
|
|
#define READ_BYTES 0x4
|
|
#define WRITE_BYTES 0x5
|
|
|
|
/* Enables, resets, freezes, overflow profiling*/
|
|
#define DBG_DIS 0x0
|
|
#define DBG_EN 0x1
|
|
#define DBG_RST 0x2
|
|
#define PRF_FRZ 0x4
|
|
#define CYC_OVF 0x8
|
|
#define PROFILE_SEL 0x10
|
|
|
|
#define MMDC_MADPCR0 0x410
|
|
#define MMDC_MADPCR1 0x414
|
|
#define MMDC_MADPSR0 0x418
|
|
#define MMDC_MADPSR1 0x41C
|
|
#define MMDC_MADPSR2 0x420
|
|
#define MMDC_MADPSR3 0x424
|
|
#define MMDC_MADPSR4 0x428
|
|
#define MMDC_MADPSR5 0x42C
|
|
|
|
#define MMDC_NUM_COUNTERS 6
|
|
|
|
#define MMDC_FLAG_PROFILE_SEL 0x1
|
|
#define MMDC_PRF_AXI_ID_CLEAR 0x0
|
|
|
|
#define to_mmdc_pmu(p) container_of(p, struct mmdc_pmu, pmu)
|
|
|
|
static int ddr_type;
|
|
|
|
struct fsl_mmdc_devtype_data {
|
|
unsigned int flags;
|
|
};
|
|
|
|
static const struct fsl_mmdc_devtype_data imx6q_data = {
|
|
};
|
|
|
|
static const struct fsl_mmdc_devtype_data imx6qp_data = {
|
|
.flags = MMDC_FLAG_PROFILE_SEL,
|
|
};
|
|
|
|
static const struct of_device_id imx_mmdc_dt_ids[] = {
|
|
{ .compatible = "fsl,imx6q-mmdc", .data = (void *)&imx6q_data},
|
|
{ .compatible = "fsl,imx6qp-mmdc", .data = (void *)&imx6qp_data},
|
|
{ /* sentinel */ }
|
|
};
|
|
|
|
#ifdef CONFIG_PERF_EVENTS
|
|
|
|
static enum cpuhp_state cpuhp_mmdc_state;
|
|
static DEFINE_IDA(mmdc_ida);
|
|
|
|
PMU_EVENT_ATTR_STRING(total-cycles, mmdc_pmu_total_cycles, "event=0x00")
|
|
PMU_EVENT_ATTR_STRING(busy-cycles, mmdc_pmu_busy_cycles, "event=0x01")
|
|
PMU_EVENT_ATTR_STRING(read-accesses, mmdc_pmu_read_accesses, "event=0x02")
|
|
PMU_EVENT_ATTR_STRING(write-accesses, mmdc_pmu_write_accesses, "event=0x03")
|
|
PMU_EVENT_ATTR_STRING(read-bytes, mmdc_pmu_read_bytes, "event=0x04")
|
|
PMU_EVENT_ATTR_STRING(read-bytes.unit, mmdc_pmu_read_bytes_unit, "MB");
|
|
PMU_EVENT_ATTR_STRING(read-bytes.scale, mmdc_pmu_read_bytes_scale, "0.000001");
|
|
PMU_EVENT_ATTR_STRING(write-bytes, mmdc_pmu_write_bytes, "event=0x05")
|
|
PMU_EVENT_ATTR_STRING(write-bytes.unit, mmdc_pmu_write_bytes_unit, "MB");
|
|
PMU_EVENT_ATTR_STRING(write-bytes.scale, mmdc_pmu_write_bytes_scale, "0.000001");
|
|
|
|
struct mmdc_pmu {
|
|
struct pmu pmu;
|
|
void __iomem *mmdc_base;
|
|
cpumask_t cpu;
|
|
struct hrtimer hrtimer;
|
|
unsigned int active_events;
|
|
struct device *dev;
|
|
struct perf_event *mmdc_events[MMDC_NUM_COUNTERS];
|
|
struct hlist_node node;
|
|
struct fsl_mmdc_devtype_data *devtype_data;
|
|
struct clk *mmdc_ipg_clk;
|
|
};
|
|
|
|
/*
|
|
* Polling period is set to one second, overflow of total-cycles (the fastest
|
|
* increasing counter) takes ten seconds so one second is safe
|
|
*/
|
|
static unsigned int mmdc_pmu_poll_period_us = 1000000;
|
|
|
|
module_param_named(pmu_pmu_poll_period_us, mmdc_pmu_poll_period_us, uint,
|
|
S_IRUGO | S_IWUSR);
|
|
|
|
static ktime_t mmdc_pmu_timer_period(void)
|
|
{
|
|
return ns_to_ktime((u64)mmdc_pmu_poll_period_us * 1000);
|
|
}
|
|
|
|
static ssize_t mmdc_pmu_cpumask_show(struct device *dev,
|
|
struct device_attribute *attr, char *buf)
|
|
{
|
|
struct mmdc_pmu *pmu_mmdc = dev_get_drvdata(dev);
|
|
|
|
return cpumap_print_to_pagebuf(true, buf, &pmu_mmdc->cpu);
|
|
}
|
|
|
|
static struct device_attribute mmdc_pmu_cpumask_attr =
|
|
__ATTR(cpumask, S_IRUGO, mmdc_pmu_cpumask_show, NULL);
|
|
|
|
static struct attribute *mmdc_pmu_cpumask_attrs[] = {
|
|
&mmdc_pmu_cpumask_attr.attr,
|
|
NULL,
|
|
};
|
|
|
|
static struct attribute_group mmdc_pmu_cpumask_attr_group = {
|
|
.attrs = mmdc_pmu_cpumask_attrs,
|
|
};
|
|
|
|
static struct attribute *mmdc_pmu_events_attrs[] = {
|
|
&mmdc_pmu_total_cycles.attr.attr,
|
|
&mmdc_pmu_busy_cycles.attr.attr,
|
|
&mmdc_pmu_read_accesses.attr.attr,
|
|
&mmdc_pmu_write_accesses.attr.attr,
|
|
&mmdc_pmu_read_bytes.attr.attr,
|
|
&mmdc_pmu_read_bytes_unit.attr.attr,
|
|
&mmdc_pmu_read_bytes_scale.attr.attr,
|
|
&mmdc_pmu_write_bytes.attr.attr,
|
|
&mmdc_pmu_write_bytes_unit.attr.attr,
|
|
&mmdc_pmu_write_bytes_scale.attr.attr,
|
|
NULL,
|
|
};
|
|
|
|
static struct attribute_group mmdc_pmu_events_attr_group = {
|
|
.name = "events",
|
|
.attrs = mmdc_pmu_events_attrs,
|
|
};
|
|
|
|
PMU_FORMAT_ATTR(event, "config:0-63");
|
|
PMU_FORMAT_ATTR(axi_id, "config1:0-63");
|
|
|
|
static struct attribute *mmdc_pmu_format_attrs[] = {
|
|
&format_attr_event.attr,
|
|
&format_attr_axi_id.attr,
|
|
NULL,
|
|
};
|
|
|
|
static struct attribute_group mmdc_pmu_format_attr_group = {
|
|
.name = "format",
|
|
.attrs = mmdc_pmu_format_attrs,
|
|
};
|
|
|
|
static const struct attribute_group *attr_groups[] = {
|
|
&mmdc_pmu_events_attr_group,
|
|
&mmdc_pmu_format_attr_group,
|
|
&mmdc_pmu_cpumask_attr_group,
|
|
NULL,
|
|
};
|
|
|
|
static u32 mmdc_pmu_read_counter(struct mmdc_pmu *pmu_mmdc, int cfg)
|
|
{
|
|
void __iomem *mmdc_base, *reg;
|
|
|
|
mmdc_base = pmu_mmdc->mmdc_base;
|
|
|
|
switch (cfg) {
|
|
case TOTAL_CYCLES:
|
|
reg = mmdc_base + MMDC_MADPSR0;
|
|
break;
|
|
case BUSY_CYCLES:
|
|
reg = mmdc_base + MMDC_MADPSR1;
|
|
break;
|
|
case READ_ACCESSES:
|
|
reg = mmdc_base + MMDC_MADPSR2;
|
|
break;
|
|
case WRITE_ACCESSES:
|
|
reg = mmdc_base + MMDC_MADPSR3;
|
|
break;
|
|
case READ_BYTES:
|
|
reg = mmdc_base + MMDC_MADPSR4;
|
|
break;
|
|
case WRITE_BYTES:
|
|
reg = mmdc_base + MMDC_MADPSR5;
|
|
break;
|
|
default:
|
|
return WARN_ONCE(1,
|
|
"invalid configuration %d for mmdc counter", cfg);
|
|
}
|
|
return readl(reg);
|
|
}
|
|
|
|
static int mmdc_pmu_offline_cpu(unsigned int cpu, struct hlist_node *node)
|
|
{
|
|
struct mmdc_pmu *pmu_mmdc = hlist_entry_safe(node, struct mmdc_pmu, node);
|
|
int target;
|
|
|
|
if (!cpumask_test_and_clear_cpu(cpu, &pmu_mmdc->cpu))
|
|
return 0;
|
|
|
|
target = cpumask_any_but(cpu_online_mask, cpu);
|
|
if (target >= nr_cpu_ids)
|
|
return 0;
|
|
|
|
perf_pmu_migrate_context(&pmu_mmdc->pmu, cpu, target);
|
|
cpumask_set_cpu(target, &pmu_mmdc->cpu);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static bool mmdc_pmu_group_event_is_valid(struct perf_event *event,
|
|
struct pmu *pmu,
|
|
unsigned long *used_counters)
|
|
{
|
|
int cfg = event->attr.config;
|
|
|
|
if (is_software_event(event))
|
|
return true;
|
|
|
|
if (event->pmu != pmu)
|
|
return false;
|
|
|
|
return !test_and_set_bit(cfg, used_counters);
|
|
}
|
|
|
|
/*
|
|
* Each event has a single fixed-purpose counter, so we can only have a
|
|
* single active event for each at any point in time. Here we just check
|
|
* for duplicates, and rely on mmdc_pmu_event_init to verify that the HW
|
|
* event numbers are valid.
|
|
*/
|
|
static bool mmdc_pmu_group_is_valid(struct perf_event *event)
|
|
{
|
|
struct pmu *pmu = event->pmu;
|
|
struct perf_event *leader = event->group_leader;
|
|
struct perf_event *sibling;
|
|
unsigned long counter_mask = 0;
|
|
|
|
set_bit(leader->attr.config, &counter_mask);
|
|
|
|
if (event != leader) {
|
|
if (!mmdc_pmu_group_event_is_valid(event, pmu, &counter_mask))
|
|
return false;
|
|
}
|
|
|
|
for_each_sibling_event(sibling, leader) {
|
|
if (!mmdc_pmu_group_event_is_valid(sibling, pmu, &counter_mask))
|
|
return false;
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
static int mmdc_pmu_event_init(struct perf_event *event)
|
|
{
|
|
struct mmdc_pmu *pmu_mmdc = to_mmdc_pmu(event->pmu);
|
|
int cfg = event->attr.config;
|
|
|
|
if (event->attr.type != event->pmu->type)
|
|
return -ENOENT;
|
|
|
|
if (is_sampling_event(event) || event->attach_state & PERF_ATTACH_TASK)
|
|
return -EOPNOTSUPP;
|
|
|
|
if (event->cpu < 0) {
|
|
dev_warn(pmu_mmdc->dev, "Can't provide per-task data!\n");
|
|
return -EOPNOTSUPP;
|
|
}
|
|
|
|
if (event->attr.sample_period)
|
|
return -EINVAL;
|
|
|
|
if (cfg < 0 || cfg >= MMDC_NUM_COUNTERS)
|
|
return -EINVAL;
|
|
|
|
if (!mmdc_pmu_group_is_valid(event))
|
|
return -EINVAL;
|
|
|
|
event->cpu = cpumask_first(&pmu_mmdc->cpu);
|
|
return 0;
|
|
}
|
|
|
|
static void mmdc_pmu_event_update(struct perf_event *event)
|
|
{
|
|
struct mmdc_pmu *pmu_mmdc = to_mmdc_pmu(event->pmu);
|
|
struct hw_perf_event *hwc = &event->hw;
|
|
u64 delta, prev_raw_count, new_raw_count;
|
|
|
|
do {
|
|
prev_raw_count = local64_read(&hwc->prev_count);
|
|
new_raw_count = mmdc_pmu_read_counter(pmu_mmdc,
|
|
event->attr.config);
|
|
} while (local64_cmpxchg(&hwc->prev_count, prev_raw_count,
|
|
new_raw_count) != prev_raw_count);
|
|
|
|
delta = (new_raw_count - prev_raw_count) & 0xFFFFFFFF;
|
|
|
|
local64_add(delta, &event->count);
|
|
}
|
|
|
|
static void mmdc_pmu_event_start(struct perf_event *event, int flags)
|
|
{
|
|
struct mmdc_pmu *pmu_mmdc = to_mmdc_pmu(event->pmu);
|
|
struct hw_perf_event *hwc = &event->hw;
|
|
void __iomem *mmdc_base, *reg;
|
|
u32 val;
|
|
|
|
mmdc_base = pmu_mmdc->mmdc_base;
|
|
reg = mmdc_base + MMDC_MADPCR0;
|
|
|
|
/*
|
|
* hrtimer is required because mmdc does not provide an interrupt so
|
|
* polling is necessary
|
|
*/
|
|
hrtimer_start(&pmu_mmdc->hrtimer, mmdc_pmu_timer_period(),
|
|
HRTIMER_MODE_REL_PINNED);
|
|
|
|
local64_set(&hwc->prev_count, 0);
|
|
|
|
writel(DBG_RST, reg);
|
|
|
|
/*
|
|
* Write the AXI id parameter to MADPCR1.
|
|
*/
|
|
val = event->attr.config1;
|
|
reg = mmdc_base + MMDC_MADPCR1;
|
|
writel(val, reg);
|
|
|
|
reg = mmdc_base + MMDC_MADPCR0;
|
|
val = DBG_EN;
|
|
if (pmu_mmdc->devtype_data->flags & MMDC_FLAG_PROFILE_SEL)
|
|
val |= PROFILE_SEL;
|
|
|
|
writel(val, reg);
|
|
}
|
|
|
|
static int mmdc_pmu_event_add(struct perf_event *event, int flags)
|
|
{
|
|
struct mmdc_pmu *pmu_mmdc = to_mmdc_pmu(event->pmu);
|
|
struct hw_perf_event *hwc = &event->hw;
|
|
|
|
int cfg = event->attr.config;
|
|
|
|
if (flags & PERF_EF_START)
|
|
mmdc_pmu_event_start(event, flags);
|
|
|
|
if (pmu_mmdc->mmdc_events[cfg] != NULL)
|
|
return -EAGAIN;
|
|
|
|
pmu_mmdc->mmdc_events[cfg] = event;
|
|
pmu_mmdc->active_events++;
|
|
|
|
local64_set(&hwc->prev_count, mmdc_pmu_read_counter(pmu_mmdc, cfg));
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void mmdc_pmu_event_stop(struct perf_event *event, int flags)
|
|
{
|
|
struct mmdc_pmu *pmu_mmdc = to_mmdc_pmu(event->pmu);
|
|
void __iomem *mmdc_base, *reg;
|
|
|
|
mmdc_base = pmu_mmdc->mmdc_base;
|
|
reg = mmdc_base + MMDC_MADPCR0;
|
|
|
|
writel(PRF_FRZ, reg);
|
|
|
|
reg = mmdc_base + MMDC_MADPCR1;
|
|
writel(MMDC_PRF_AXI_ID_CLEAR, reg);
|
|
|
|
mmdc_pmu_event_update(event);
|
|
}
|
|
|
|
static void mmdc_pmu_event_del(struct perf_event *event, int flags)
|
|
{
|
|
struct mmdc_pmu *pmu_mmdc = to_mmdc_pmu(event->pmu);
|
|
int cfg = event->attr.config;
|
|
|
|
pmu_mmdc->mmdc_events[cfg] = NULL;
|
|
pmu_mmdc->active_events--;
|
|
|
|
if (pmu_mmdc->active_events == 0)
|
|
hrtimer_cancel(&pmu_mmdc->hrtimer);
|
|
|
|
mmdc_pmu_event_stop(event, PERF_EF_UPDATE);
|
|
}
|
|
|
|
static void mmdc_pmu_overflow_handler(struct mmdc_pmu *pmu_mmdc)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < MMDC_NUM_COUNTERS; i++) {
|
|
struct perf_event *event = pmu_mmdc->mmdc_events[i];
|
|
|
|
if (event)
|
|
mmdc_pmu_event_update(event);
|
|
}
|
|
}
|
|
|
|
static enum hrtimer_restart mmdc_pmu_timer_handler(struct hrtimer *hrtimer)
|
|
{
|
|
struct mmdc_pmu *pmu_mmdc = container_of(hrtimer, struct mmdc_pmu,
|
|
hrtimer);
|
|
|
|
mmdc_pmu_overflow_handler(pmu_mmdc);
|
|
hrtimer_forward_now(hrtimer, mmdc_pmu_timer_period());
|
|
|
|
return HRTIMER_RESTART;
|
|
}
|
|
|
|
static int mmdc_pmu_init(struct mmdc_pmu *pmu_mmdc,
|
|
void __iomem *mmdc_base, struct device *dev)
|
|
{
|
|
int mmdc_num;
|
|
|
|
*pmu_mmdc = (struct mmdc_pmu) {
|
|
.pmu = (struct pmu) {
|
|
.task_ctx_nr = perf_invalid_context,
|
|
.attr_groups = attr_groups,
|
|
.event_init = mmdc_pmu_event_init,
|
|
.add = mmdc_pmu_event_add,
|
|
.del = mmdc_pmu_event_del,
|
|
.start = mmdc_pmu_event_start,
|
|
.stop = mmdc_pmu_event_stop,
|
|
.read = mmdc_pmu_event_update,
|
|
.capabilities = PERF_PMU_CAP_NO_EXCLUDE,
|
|
},
|
|
.mmdc_base = mmdc_base,
|
|
.dev = dev,
|
|
.active_events = 0,
|
|
};
|
|
|
|
mmdc_num = ida_simple_get(&mmdc_ida, 0, 0, GFP_KERNEL);
|
|
|
|
return mmdc_num;
|
|
}
|
|
|
|
static int imx_mmdc_remove(struct platform_device *pdev)
|
|
{
|
|
struct mmdc_pmu *pmu_mmdc = platform_get_drvdata(pdev);
|
|
|
|
cpuhp_state_remove_instance_nocalls(cpuhp_mmdc_state, &pmu_mmdc->node);
|
|
perf_pmu_unregister(&pmu_mmdc->pmu);
|
|
iounmap(pmu_mmdc->mmdc_base);
|
|
clk_disable_unprepare(pmu_mmdc->mmdc_ipg_clk);
|
|
kfree(pmu_mmdc);
|
|
return 0;
|
|
}
|
|
|
|
static int imx_mmdc_perf_init(struct platform_device *pdev, void __iomem *mmdc_base,
|
|
struct clk *mmdc_ipg_clk)
|
|
{
|
|
struct mmdc_pmu *pmu_mmdc;
|
|
char *name;
|
|
int mmdc_num;
|
|
int ret;
|
|
const struct of_device_id *of_id =
|
|
of_match_device(imx_mmdc_dt_ids, &pdev->dev);
|
|
|
|
pmu_mmdc = kzalloc(sizeof(*pmu_mmdc), GFP_KERNEL);
|
|
if (!pmu_mmdc) {
|
|
pr_err("failed to allocate PMU device!\n");
|
|
return -ENOMEM;
|
|
}
|
|
|
|
/* The first instance registers the hotplug state */
|
|
if (!cpuhp_mmdc_state) {
|
|
ret = cpuhp_setup_state_multi(CPUHP_AP_ONLINE_DYN,
|
|
"perf/arm/mmdc:online", NULL,
|
|
mmdc_pmu_offline_cpu);
|
|
if (ret < 0) {
|
|
pr_err("cpuhp_setup_state_multi failed\n");
|
|
goto pmu_free;
|
|
}
|
|
cpuhp_mmdc_state = ret;
|
|
}
|
|
|
|
mmdc_num = mmdc_pmu_init(pmu_mmdc, mmdc_base, &pdev->dev);
|
|
pmu_mmdc->mmdc_ipg_clk = mmdc_ipg_clk;
|
|
if (mmdc_num == 0)
|
|
name = "mmdc";
|
|
else
|
|
name = devm_kasprintf(&pdev->dev,
|
|
GFP_KERNEL, "mmdc%d", mmdc_num);
|
|
|
|
pmu_mmdc->devtype_data = (struct fsl_mmdc_devtype_data *)of_id->data;
|
|
|
|
hrtimer_init(&pmu_mmdc->hrtimer, CLOCK_MONOTONIC,
|
|
HRTIMER_MODE_REL);
|
|
pmu_mmdc->hrtimer.function = mmdc_pmu_timer_handler;
|
|
|
|
cpumask_set_cpu(raw_smp_processor_id(), &pmu_mmdc->cpu);
|
|
|
|
/* Register the pmu instance for cpu hotplug */
|
|
cpuhp_state_add_instance_nocalls(cpuhp_mmdc_state, &pmu_mmdc->node);
|
|
|
|
ret = perf_pmu_register(&(pmu_mmdc->pmu), name, -1);
|
|
if (ret)
|
|
goto pmu_register_err;
|
|
|
|
platform_set_drvdata(pdev, pmu_mmdc);
|
|
return 0;
|
|
|
|
pmu_register_err:
|
|
pr_warn("MMDC Perf PMU failed (%d), disabled\n", ret);
|
|
cpuhp_state_remove_instance_nocalls(cpuhp_mmdc_state, &pmu_mmdc->node);
|
|
hrtimer_cancel(&pmu_mmdc->hrtimer);
|
|
pmu_free:
|
|
kfree(pmu_mmdc);
|
|
return ret;
|
|
}
|
|
|
|
#else
|
|
#define imx_mmdc_remove NULL
|
|
#define imx_mmdc_perf_init(pdev, mmdc_base, mmdc_ipg_clk) 0
|
|
#endif
|
|
|
|
static int imx_mmdc_probe(struct platform_device *pdev)
|
|
{
|
|
struct device_node *np = pdev->dev.of_node;
|
|
void __iomem *mmdc_base, *reg;
|
|
struct clk *mmdc_ipg_clk;
|
|
u32 val;
|
|
int err;
|
|
|
|
/* the ipg clock is optional */
|
|
mmdc_ipg_clk = devm_clk_get(&pdev->dev, NULL);
|
|
if (IS_ERR(mmdc_ipg_clk))
|
|
mmdc_ipg_clk = NULL;
|
|
|
|
err = clk_prepare_enable(mmdc_ipg_clk);
|
|
if (err) {
|
|
dev_err(&pdev->dev, "Unable to enable mmdc ipg clock.\n");
|
|
return err;
|
|
}
|
|
|
|
mmdc_base = of_iomap(np, 0);
|
|
WARN_ON(!mmdc_base);
|
|
|
|
reg = mmdc_base + MMDC_MDMISC;
|
|
/* Get ddr type */
|
|
val = readl_relaxed(reg);
|
|
ddr_type = (val & BM_MMDC_MDMISC_DDR_TYPE) >>
|
|
BP_MMDC_MDMISC_DDR_TYPE;
|
|
|
|
reg = mmdc_base + MMDC_MAPSR;
|
|
|
|
/* Enable automatic power saving */
|
|
val = readl_relaxed(reg);
|
|
val &= ~(1 << BP_MMDC_MAPSR_PSD);
|
|
writel_relaxed(val, reg);
|
|
|
|
err = imx_mmdc_perf_init(pdev, mmdc_base, mmdc_ipg_clk);
|
|
if (err) {
|
|
iounmap(mmdc_base);
|
|
clk_disable_unprepare(mmdc_ipg_clk);
|
|
}
|
|
|
|
return err;
|
|
}
|
|
|
|
int imx_mmdc_get_ddr_type(void)
|
|
{
|
|
return ddr_type;
|
|
}
|
|
|
|
static struct platform_driver imx_mmdc_driver = {
|
|
.driver = {
|
|
.name = "imx-mmdc",
|
|
.of_match_table = imx_mmdc_dt_ids,
|
|
},
|
|
.probe = imx_mmdc_probe,
|
|
.remove = imx_mmdc_remove,
|
|
};
|
|
|
|
static int __init imx_mmdc_init(void)
|
|
{
|
|
return platform_driver_register(&imx_mmdc_driver);
|
|
}
|
|
postcore_initcall(imx_mmdc_init);
|