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memory: brcmstb_memc: Add Broadcom STB memory controller driver 

Add support for configuring the Self Refresh Power Down (SRPD)
inactivity timeout on Broadcom STB chips. This is used to conserve power
when the DRAM activity is reduced.

Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/20220812222533.2428033-4-f.fainelli@gmail.com
This commit is contained in:
Florian Fainelli 2022-08-12 15:25:33 -07:00 committed by Krzysztof Kozlowski
parent e3a1b9245e
commit a4be90ff7a
3 changed files with 311 additions and 0 deletions
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9
drivers/memory/Kconfig
View File

@ -66,6 +66,15 @@ config BRCMSTB_DPFE
for the DRAM's temperature. Slower refresh rate means cooler RAM,
higher refresh rate means hotter RAM.
config BRCMSTB_MEMC
tristate "Broadcom STB MEMC driver"
default ARCH_BRCMSTB
depends on ARCH_BRCMSTB || COMPILE_TEST
help
This driver provides a way to configure the Broadcom STB memory
controller and specifically control the Self Refresh Power Down
(SRPD) inactivity timeout.
config BT1_L2_CTL
bool "Baikal-T1 CM2 L2-RAM Cache Control Block"
depends on MIPS_BAIKAL_T1 || COMPILE_TEST

1
drivers/memory/Makefile
View File

@ -11,6 +11,7 @@ obj-$(CONFIG_ARM_PL172_MPMC) += pl172.o
obj-$(CONFIG_ATMEL_SDRAMC) += atmel-sdramc.o
obj-$(CONFIG_ATMEL_EBI) += atmel-ebi.o
obj-$(CONFIG_BRCMSTB_DPFE) += brcmstb_dpfe.o
obj-$(CONFIG_BRCMSTB_MEMC) += brcmstb_memc.o
obj-$(CONFIG_BT1_L2_CTL) += bt1-l2-ctl.o
obj-$(CONFIG_TI_AEMIF) += ti-aemif.o
obj-$(CONFIG_TI_EMIF) += emif.o

301
drivers/memory/brcmstb_memc.c Normal file
View File

@ -0,0 +1,301 @@
// SPDX-License-Identifier: GPL-2.0-only
/*
* DDR Self-Refresh Power Down (SRPD) support for Broadcom STB SoCs
*
*/
#include <linux/init.h>
#include <linux/io.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/of_device.h>
#include <linux/platform_device.h>
#define REG_MEMC_CNTRLR_CONFIG 0x00
#define CNTRLR_CONFIG_LPDDR4_SHIFT 5
#define CNTRLR_CONFIG_MASK 0xf
#define REG_MEMC_SRPD_CFG_21 0x20
#define REG_MEMC_SRPD_CFG_20 0x34
#define REG_MEMC_SRPD_CFG_1x 0x3c
#define INACT_COUNT_SHIFT 0
#define INACT_COUNT_MASK 0xffff
#define SRPD_EN_SHIFT 16
struct brcmstb_memc_data {
u32 srpd_offset;
};
struct brcmstb_memc {
struct device *dev;
void __iomem *ddr_ctrl;
unsigned int timeout_cycles;
u32 frequency;
u32 srpd_offset;
};
static int brcmstb_memc_uses_lpddr4(struct brcmstb_memc *memc)
{
void __iomem *config = memc->ddr_ctrl + REG_MEMC_CNTRLR_CONFIG;
u32 reg;
reg = readl_relaxed(config) & CNTRLR_CONFIG_MASK;
return reg == CNTRLR_CONFIG_LPDDR4_SHIFT;
}
static int brcmstb_memc_srpd_config(struct brcmstb_memc *memc,
unsigned int cycles)
{
void __iomem *cfg = memc->ddr_ctrl + memc->srpd_offset;
u32 val;
/* Max timeout supported in HW */
if (cycles > INACT_COUNT_MASK)
return -EINVAL;
memc->timeout_cycles = cycles;
val = (cycles << INACT_COUNT_SHIFT) & INACT_COUNT_MASK;
if (cycles)
val |= BIT(SRPD_EN_SHIFT);
writel_relaxed(val, cfg);
/* Ensure the write is committed to the controller */
(void)readl_relaxed(cfg);
return 0;
}
static ssize_t frequency_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct brcmstb_memc *memc = dev_get_drvdata(dev);
return sprintf(buf, "%d\n", memc->frequency);
}
static ssize_t srpd_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct brcmstb_memc *memc = dev_get_drvdata(dev);
return sprintf(buf, "%d\n", memc->timeout_cycles);
}
static ssize_t srpd_store(struct device *dev, struct device_attribute *attr,
const char *buf, size_t count)
{
struct brcmstb_memc *memc = dev_get_drvdata(dev);
unsigned int val;
int ret;
/*
* Cannot change the inactivity timeout on LPDDR4 chips because the
* dynamic tuning process will also get affected by the inactivity
* timeout, thus making it non functional.
*/
if (brcmstb_memc_uses_lpddr4(memc))
return -EOPNOTSUPP;
ret = kstrtouint(buf, 10, &val);
if (ret < 0)
return ret;
ret = brcmstb_memc_srpd_config(memc, val);
if (ret)
return ret;
return count;
}
static DEVICE_ATTR_RO(frequency);
static DEVICE_ATTR_RW(srpd);
static struct attribute *dev_attrs[] = {
&dev_attr_frequency.attr,
&dev_attr_srpd.attr,
NULL,
};
static struct attribute_group dev_attr_group = {
.attrs = dev_attrs,
};
static const struct of_device_id brcmstb_memc_of_match[];
static int brcmstb_memc_probe(struct platform_device *pdev)
{
const struct brcmstb_memc_data *memc_data;
const struct of_device_id *of_id;
struct device *dev = &pdev->dev;
struct brcmstb_memc *memc;
int ret;
memc = devm_kzalloc(dev, sizeof(*memc), GFP_KERNEL);
if (!memc)
return -ENOMEM;
dev_set_drvdata(dev, memc);
of_id = of_match_device(brcmstb_memc_of_match, dev);
memc_data = of_id->data;
memc->srpd_offset = memc_data->srpd_offset;
memc->ddr_ctrl = devm_platform_ioremap_resource(pdev, 0);
if (IS_ERR(memc->ddr_ctrl))
return PTR_ERR(memc->ddr_ctrl);
of_property_read_u32(pdev->dev.of_node, "clock-frequency",
&memc->frequency);
ret = sysfs_create_group(&dev->kobj, &dev_attr_group);
if (ret)
return ret;
return 0;
}
static int brcmstb_memc_remove(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
sysfs_remove_group(&dev->kobj, &dev_attr_group);
return 0;
}
enum brcmstb_memc_hwtype {
BRCMSTB_MEMC_V21,
BRCMSTB_MEMC_V20,
BRCMSTB_MEMC_V1X,
};
static const struct brcmstb_memc_data brcmstb_memc_versions[] = {
{ .srpd_offset = REG_MEMC_SRPD_CFG_21 },
{ .srpd_offset = REG_MEMC_SRPD_CFG_20 },
{ .srpd_offset = REG_MEMC_SRPD_CFG_1x },
};
static const struct of_device_id brcmstb_memc_of_match[] = {
{
.compatible = "brcm,brcmstb-memc-ddr-rev-b.1.x",
.data = &brcmstb_memc_versions[BRCMSTB_MEMC_V1X]
},
{
.compatible = "brcm,brcmstb-memc-ddr-rev-b.2.0",
.data = &brcmstb_memc_versions[BRCMSTB_MEMC_V20]
},
{
.compatible = "brcm,brcmstb-memc-ddr-rev-b.2.1",
.data = &brcmstb_memc_versions[BRCMSTB_MEMC_V21]
},
{
.compatible = "brcm,brcmstb-memc-ddr-rev-b.2.2",
.data = &brcmstb_memc_versions[BRCMSTB_MEMC_V21]
},
{
.compatible = "brcm,brcmstb-memc-ddr-rev-b.2.3",
.data = &brcmstb_memc_versions[BRCMSTB_MEMC_V21]
},
{
.compatible = "brcm,brcmstb-memc-ddr-rev-b.2.5",
.data = &brcmstb_memc_versions[BRCMSTB_MEMC_V21]
},
{
.compatible = "brcm,brcmstb-memc-ddr-rev-b.2.6",
.data = &brcmstb_memc_versions[BRCMSTB_MEMC_V21]
},
{
.compatible = "brcm,brcmstb-memc-ddr-rev-b.2.7",
.data = &brcmstb_memc_versions[BRCMSTB_MEMC_V21]
},
{
.compatible = "brcm,brcmstb-memc-ddr-rev-b.2.8",
.data = &brcmstb_memc_versions[BRCMSTB_MEMC_V21]
},
{
.compatible = "brcm,brcmstb-memc-ddr-rev-b.3.0",
.data = &brcmstb_memc_versions[BRCMSTB_MEMC_V21]
},
{
.compatible = "brcm,brcmstb-memc-ddr-rev-b.3.1",
.data = &brcmstb_memc_versions[BRCMSTB_MEMC_V21]
},
{
.compatible = "brcm,brcmstb-memc-ddr-rev-c.1.0",
.data = &brcmstb_memc_versions[BRCMSTB_MEMC_V21]
},
{
.compatible = "brcm,brcmstb-memc-ddr-rev-c.1.1",
.data = &brcmstb_memc_versions[BRCMSTB_MEMC_V21]
},
{
.compatible = "brcm,brcmstb-memc-ddr-rev-c.1.2",
.data = &brcmstb_memc_versions[BRCMSTB_MEMC_V21]
},
{
.compatible = "brcm,brcmstb-memc-ddr-rev-c.1.3",
.data = &brcmstb_memc_versions[BRCMSTB_MEMC_V21]
},
{
.compatible = "brcm,brcmstb-memc-ddr-rev-c.1.4",
.data = &brcmstb_memc_versions[BRCMSTB_MEMC_V21]
},
/* default to the original offset */
{
.compatible = "brcm,brcmstb-memc-ddr",
.data = &brcmstb_memc_versions[BRCMSTB_MEMC_V1X]
},
{}
};
static int brcmstb_memc_suspend(struct device *dev)
{
struct brcmstb_memc *memc = dev_get_drvdata(dev);
void __iomem *cfg = memc->ddr_ctrl + memc->srpd_offset;
u32 val;
if (memc->timeout_cycles == 0)
return 0;
/*
* Disable SRPD prior to suspending the system since that can
* cause issues with other memory clients managed by the ARM
* trusted firmware to access memory.
*/
val = readl_relaxed(cfg);
val &= ~BIT(SRPD_EN_SHIFT);
writel_relaxed(val, cfg);
/* Ensure the write is committed to the controller */
(void)readl_relaxed(cfg);
return 0;
}
static int brcmstb_memc_resume(struct device *dev)
{
struct brcmstb_memc *memc = dev_get_drvdata(dev);
if (memc->timeout_cycles == 0)
return 0;
return brcmstb_memc_srpd_config(memc, memc->timeout_cycles);
}
static DEFINE_SIMPLE_DEV_PM_OPS(brcmstb_memc_pm_ops, brcmstb_memc_suspend,
brcmstb_memc_resume);
static struct platform_driver brcmstb_memc_driver = {
.probe = brcmstb_memc_probe,
.remove = brcmstb_memc_remove,
.driver = {
.name = "brcmstb_memc",
.of_match_table = brcmstb_memc_of_match,
.pm = pm_ptr(&brcmstb_memc_pm_ops),
},
};
module_platform_driver(brcmstb_memc_driver);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Broadcom");
MODULE_DESCRIPTION("DDR SRPD driver for Broadcom STB chips");