mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-12-11 13:04:03 +08:00
7f04614b67
Add blank lines to improve code readability. No functional change. Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
325 lines
7.3 KiB
C
325 lines
7.3 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
|
|
/*
|
|
* Copyright (C) 2020 BAIKAL ELECTRONICS, JSC
|
|
*
|
|
* Authors:
|
|
* Serge Semin <Sergey.Semin@baikalelectronics.ru>
|
|
*
|
|
* Baikal-T1 CM2 L2-cache Control Block driver.
|
|
*/
|
|
|
|
#include <linux/kernel.h>
|
|
#include <linux/module.h>
|
|
#include <linux/bitfield.h>
|
|
#include <linux/types.h>
|
|
#include <linux/device.h>
|
|
#include <linux/platform_device.h>
|
|
#include <linux/regmap.h>
|
|
#include <linux/mfd/syscon.h>
|
|
#include <linux/sysfs.h>
|
|
#include <linux/of.h>
|
|
|
|
#define L2_CTL_REG 0x028
|
|
#define L2_CTL_DATA_STALL_FLD 0
|
|
#define L2_CTL_DATA_STALL_MASK GENMASK(1, L2_CTL_DATA_STALL_FLD)
|
|
#define L2_CTL_TAG_STALL_FLD 2
|
|
#define L2_CTL_TAG_STALL_MASK GENMASK(3, L2_CTL_TAG_STALL_FLD)
|
|
#define L2_CTL_WS_STALL_FLD 4
|
|
#define L2_CTL_WS_STALL_MASK GENMASK(5, L2_CTL_WS_STALL_FLD)
|
|
#define L2_CTL_SET_CLKRATIO BIT(13)
|
|
#define L2_CTL_CLKRATIO_LOCK BIT(31)
|
|
|
|
#define L2_CTL_STALL_MIN 0
|
|
#define L2_CTL_STALL_MAX 3
|
|
#define L2_CTL_STALL_SET_DELAY_US 1
|
|
#define L2_CTL_STALL_SET_TOUT_US 1000
|
|
|
|
/*
|
|
* struct l2_ctl - Baikal-T1 L2 Control block private data.
|
|
* @dev: Pointer to the device structure.
|
|
* @sys_regs: Baikal-T1 System Controller registers map.
|
|
*/
|
|
struct l2_ctl {
|
|
struct device *dev;
|
|
|
|
struct regmap *sys_regs;
|
|
};
|
|
|
|
/*
|
|
* enum l2_ctl_stall - Baikal-T1 L2-cache-RAM stall identifier.
|
|
* @L2_WSSTALL: Way-select latency.
|
|
* @L2_TAGSTALL: Tag latency.
|
|
* @L2_DATASTALL: Data latency.
|
|
*/
|
|
enum l2_ctl_stall {
|
|
L2_WS_STALL,
|
|
L2_TAG_STALL,
|
|
L2_DATA_STALL
|
|
};
|
|
|
|
/*
|
|
* struct l2_ctl_device_attribute - Baikal-T1 L2-cache device attribute.
|
|
* @dev_attr: Actual sysfs device attribute.
|
|
* @id: L2-cache stall field identifier.
|
|
*/
|
|
struct l2_ctl_device_attribute {
|
|
struct device_attribute dev_attr;
|
|
enum l2_ctl_stall id;
|
|
};
|
|
|
|
#define to_l2_ctl_dev_attr(_dev_attr) \
|
|
container_of(_dev_attr, struct l2_ctl_device_attribute, dev_attr)
|
|
|
|
#define L2_CTL_ATTR_RW(_name, _prefix, _id) \
|
|
struct l2_ctl_device_attribute l2_ctl_attr_##_name = \
|
|
{ __ATTR(_name, 0644, _prefix##_show, _prefix##_store), _id }
|
|
|
|
static int l2_ctl_get_latency(struct l2_ctl *l2, enum l2_ctl_stall id, u32 *val)
|
|
{
|
|
u32 data = 0;
|
|
int ret;
|
|
|
|
ret = regmap_read(l2->sys_regs, L2_CTL_REG, &data);
|
|
if (ret)
|
|
return ret;
|
|
|
|
switch (id) {
|
|
case L2_WS_STALL:
|
|
*val = FIELD_GET(L2_CTL_WS_STALL_MASK, data);
|
|
break;
|
|
case L2_TAG_STALL:
|
|
*val = FIELD_GET(L2_CTL_TAG_STALL_MASK, data);
|
|
break;
|
|
case L2_DATA_STALL:
|
|
*val = FIELD_GET(L2_CTL_DATA_STALL_MASK, data);
|
|
break;
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int l2_ctl_set_latency(struct l2_ctl *l2, enum l2_ctl_stall id, u32 val)
|
|
{
|
|
u32 mask = 0, data = 0;
|
|
int ret;
|
|
|
|
val = clamp_val(val, L2_CTL_STALL_MIN, L2_CTL_STALL_MAX);
|
|
|
|
switch (id) {
|
|
case L2_WS_STALL:
|
|
data = FIELD_PREP(L2_CTL_WS_STALL_MASK, val);
|
|
mask = L2_CTL_WS_STALL_MASK;
|
|
break;
|
|
case L2_TAG_STALL:
|
|
data = FIELD_PREP(L2_CTL_TAG_STALL_MASK, val);
|
|
mask = L2_CTL_TAG_STALL_MASK;
|
|
break;
|
|
case L2_DATA_STALL:
|
|
data = FIELD_PREP(L2_CTL_DATA_STALL_MASK, val);
|
|
mask = L2_CTL_DATA_STALL_MASK;
|
|
break;
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
|
|
data |= L2_CTL_SET_CLKRATIO;
|
|
mask |= L2_CTL_SET_CLKRATIO;
|
|
|
|
ret = regmap_update_bits(l2->sys_regs, L2_CTL_REG, mask, data);
|
|
if (ret)
|
|
return ret;
|
|
|
|
return regmap_read_poll_timeout(l2->sys_regs, L2_CTL_REG, data,
|
|
data & L2_CTL_CLKRATIO_LOCK,
|
|
L2_CTL_STALL_SET_DELAY_US,
|
|
L2_CTL_STALL_SET_TOUT_US);
|
|
}
|
|
|
|
static void l2_ctl_clear_data(void *data)
|
|
{
|
|
struct l2_ctl *l2 = data;
|
|
struct platform_device *pdev = to_platform_device(l2->dev);
|
|
|
|
platform_set_drvdata(pdev, NULL);
|
|
}
|
|
|
|
static struct l2_ctl *l2_ctl_create_data(struct platform_device *pdev)
|
|
{
|
|
struct device *dev = &pdev->dev;
|
|
struct l2_ctl *l2;
|
|
int ret;
|
|
|
|
l2 = devm_kzalloc(dev, sizeof(*l2), GFP_KERNEL);
|
|
if (!l2)
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
ret = devm_add_action(dev, l2_ctl_clear_data, l2);
|
|
if (ret) {
|
|
dev_err(dev, "Can't add L2 CTL data clear action\n");
|
|
return ERR_PTR(ret);
|
|
}
|
|
|
|
l2->dev = dev;
|
|
platform_set_drvdata(pdev, l2);
|
|
|
|
return l2;
|
|
}
|
|
|
|
static int l2_ctl_find_sys_regs(struct l2_ctl *l2)
|
|
{
|
|
l2->sys_regs = syscon_node_to_regmap(l2->dev->of_node->parent);
|
|
if (IS_ERR(l2->sys_regs)) {
|
|
dev_err(l2->dev, "Couldn't get L2 CTL register map\n");
|
|
return PTR_ERR(l2->sys_regs);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int l2_ctl_of_parse_property(struct l2_ctl *l2, enum l2_ctl_stall id,
|
|
const char *propname)
|
|
{
|
|
int ret = 0;
|
|
u32 data;
|
|
|
|
if (!of_property_read_u32(l2->dev->of_node, propname, &data)) {
|
|
ret = l2_ctl_set_latency(l2, id, data);
|
|
if (ret)
|
|
dev_err(l2->dev, "Invalid value of '%s'\n", propname);
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int l2_ctl_of_parse(struct l2_ctl *l2)
|
|
{
|
|
int ret;
|
|
|
|
ret = l2_ctl_of_parse_property(l2, L2_WS_STALL, "baikal,l2-ws-latency");
|
|
if (ret)
|
|
return ret;
|
|
|
|
ret = l2_ctl_of_parse_property(l2, L2_TAG_STALL, "baikal,l2-tag-latency");
|
|
if (ret)
|
|
return ret;
|
|
|
|
return l2_ctl_of_parse_property(l2, L2_DATA_STALL,
|
|
"baikal,l2-data-latency");
|
|
}
|
|
|
|
static ssize_t l2_ctl_latency_show(struct device *dev,
|
|
struct device_attribute *attr,
|
|
char *buf)
|
|
{
|
|
struct l2_ctl_device_attribute *devattr = to_l2_ctl_dev_attr(attr);
|
|
struct l2_ctl *l2 = dev_get_drvdata(dev);
|
|
u32 data;
|
|
int ret;
|
|
|
|
ret = l2_ctl_get_latency(l2, devattr->id, &data);
|
|
if (ret)
|
|
return ret;
|
|
|
|
return scnprintf(buf, PAGE_SIZE, "%u\n", data);
|
|
}
|
|
|
|
static ssize_t l2_ctl_latency_store(struct device *dev,
|
|
struct device_attribute *attr,
|
|
const char *buf, size_t count)
|
|
{
|
|
struct l2_ctl_device_attribute *devattr = to_l2_ctl_dev_attr(attr);
|
|
struct l2_ctl *l2 = dev_get_drvdata(dev);
|
|
u32 data;
|
|
int ret;
|
|
|
|
if (kstrtouint(buf, 0, &data) < 0)
|
|
return -EINVAL;
|
|
|
|
ret = l2_ctl_set_latency(l2, devattr->id, data);
|
|
if (ret)
|
|
return ret;
|
|
|
|
return count;
|
|
}
|
|
|
|
static L2_CTL_ATTR_RW(l2_ws_latency, l2_ctl_latency, L2_WS_STALL);
|
|
static L2_CTL_ATTR_RW(l2_tag_latency, l2_ctl_latency, L2_TAG_STALL);
|
|
static L2_CTL_ATTR_RW(l2_data_latency, l2_ctl_latency, L2_DATA_STALL);
|
|
|
|
static struct attribute *l2_ctl_sysfs_attrs[] = {
|
|
&l2_ctl_attr_l2_ws_latency.dev_attr.attr,
|
|
&l2_ctl_attr_l2_tag_latency.dev_attr.attr,
|
|
&l2_ctl_attr_l2_data_latency.dev_attr.attr,
|
|
NULL
|
|
};
|
|
ATTRIBUTE_GROUPS(l2_ctl_sysfs);
|
|
|
|
static void l2_ctl_remove_sysfs(void *data)
|
|
{
|
|
struct l2_ctl *l2 = data;
|
|
|
|
device_remove_groups(l2->dev, l2_ctl_sysfs_groups);
|
|
}
|
|
|
|
static int l2_ctl_init_sysfs(struct l2_ctl *l2)
|
|
{
|
|
int ret;
|
|
|
|
ret = device_add_groups(l2->dev, l2_ctl_sysfs_groups);
|
|
if (ret) {
|
|
dev_err(l2->dev, "Failed to create L2 CTL sysfs nodes\n");
|
|
return ret;
|
|
}
|
|
|
|
ret = devm_add_action_or_reset(l2->dev, l2_ctl_remove_sysfs, l2);
|
|
if (ret)
|
|
dev_err(l2->dev, "Can't add L2 CTL sysfs remove action\n");
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int l2_ctl_probe(struct platform_device *pdev)
|
|
{
|
|
struct l2_ctl *l2;
|
|
int ret;
|
|
|
|
l2 = l2_ctl_create_data(pdev);
|
|
if (IS_ERR(l2))
|
|
return PTR_ERR(l2);
|
|
|
|
ret = l2_ctl_find_sys_regs(l2);
|
|
if (ret)
|
|
return ret;
|
|
|
|
ret = l2_ctl_of_parse(l2);
|
|
if (ret)
|
|
return ret;
|
|
|
|
ret = l2_ctl_init_sysfs(l2);
|
|
if (ret)
|
|
return ret;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct of_device_id l2_ctl_of_match[] = {
|
|
{ .compatible = "baikal,bt1-l2-ctl" },
|
|
{ }
|
|
};
|
|
MODULE_DEVICE_TABLE(of, l2_ctl_of_match);
|
|
|
|
static struct platform_driver l2_ctl_driver = {
|
|
.probe = l2_ctl_probe,
|
|
.driver = {
|
|
.name = "bt1-l2-ctl",
|
|
.of_match_table = l2_ctl_of_match
|
|
}
|
|
};
|
|
module_platform_driver(l2_ctl_driver);
|
|
|
|
MODULE_AUTHOR("Serge Semin <Sergey.Semin@baikalelectronics.ru>");
|
|
MODULE_DESCRIPTION("Baikal-T1 L2-cache driver");
|
|
MODULE_LICENSE("GPL v2");
|