[PATCH V7 03/13] soc: mediatek: add driver for dvfsrc support

Henry Chen
2021-01-08T07:59:34Z

Add dvfsrc driver for MT6873/MT8183/MT8192

Signed-off-by: Henry Chen <henryc.chen@mediatek.com>
---
drivers/soc/mediatek/Kconfig | 12 +
drivers/soc/mediatek/Makefile | 1 +
drivers/soc/mediatek/mtk-dvfsrc.c | 421 ++++++++++++++++++++++++++++++++
include/linux/soc/mediatek/mtk_dvfsrc.h | 35 +++
4 files changed, 469 insertions(+)
create mode 100644 drivers/soc/mediatek/mtk-dvfsrc.c
create mode 100644 include/linux/soc/mediatek/mtk_dvfsrc.h

diff --git a/drivers/soc/mediatek/Kconfig b/drivers/soc/mediatek/Kconfig
index fdd8bc0..693a0ff 100644
--- a/drivers/soc/mediatek/Kconfig
+++ b/drivers/soc/mediatek/Kconfig
@@ -26,6 +26,18 @@ config MTK_DEVAPC
The violation information is logged for further analysis or
countermeasures.

+config MTK_DVFSRC
+ tristate "MediaTek DVFSRC Support"
+ depends on ARCH_MEDIATEK
+ depends on MTK_SCPSYS
+ help
+ Say yes here to add support for the MediaTek DVFSRC (dynamic voltage
+ and frequency scaling resource collector) found
+ on different MediaTek SoCs. The DVFSRC is a proprietary
+ hardware which is used to collect all the requests from
+ system and turn into the decision of minimum Vcore voltage
+ and minimum DRAM frequency to fulfill those requests.
+
config MTK_INFRACFG
bool "MediaTek INFRACFG Support"
select REGMAP
diff --git a/drivers/soc/mediatek/Makefile b/drivers/soc/mediatek/Makefile
index b6908db..4ead103 100644
--- a/drivers/soc/mediatek/Makefile
+++ b/drivers/soc/mediatek/Makefile
@@ -1,6 +1,7 @@
# SPDX-License-Identifier: GPL-2.0-only
obj-$(CONFIG_MTK_CMDQ) += mtk-cmdq-helper.o
obj-$(CONFIG_MTK_DEVAPC) += mtk-devapc.o
+obj-$(CONFIG_MTK_DVFSRC) += mtk-dvfsrc.o
obj-$(CONFIG_MTK_INFRACFG) += mtk-infracfg.o
obj-$(CONFIG_MTK_PMIC_WRAP) += mtk-pmic-wrap.o
obj-$(CONFIG_MTK_SCPSYS) += mtk-scpsys.o
diff --git a/drivers/soc/mediatek/mtk-dvfsrc.c b/drivers/soc/mediatek/mtk-dvfsrc.c
new file mode 100644
index 0000000..c0c6d91
--- /dev/null
+++ b/drivers/soc/mediatek/mtk-dvfsrc.c
@@ -0,0 +1,421 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) 2021 MediaTek Inc.
+ */
+
+#include <linux/arm-smccc.h>
+#include <linux/io.h>
+#include <linux/iopoll.h>
+#include <linux/module.h>
+#include <linux/notifier.h>
+#include <linux/of_device.h>
+#include <linux/platform_device.h>
+#include <linux/soc/mediatek/mtk_dvfsrc.h>
+#include <linux/soc/mediatek/mtk_sip_svc.h>
+
+#define DVFSRC_IDLE 0x00
+#define DVFSRC_GET_TARGET_LEVEL(x) (((x) >> 0) & 0x0000ffff)
+#define DVFSRC_GET_CURRENT_LEVEL(x) (((x) >> 16) & 0x0000ffff)
+#define kbps_to_mbps(x) ((x) / 1000)
+
+#define POLL_TIMEOUT 1000
+#define STARTUP_TIME 1
+
+#define MTK_SIP_DVFSRC_INIT 0x00
+
+#define DVFSRC_OPP_DESC(_opp_table) \
+{ \
+ .opps = _opp_table, \
+ .num_opp = ARRAY_SIZE(_opp_table), \
+}
+
+struct dvfsrc_opp {
+ u32 vcore_opp;
+ u32 dram_opp;
+};
+
+struct dvfsrc_opp_desc {
+ const struct dvfsrc_opp *opps;
+ u32 num_opp;
+};
+
+struct mtk_dvfsrc;
+struct dvfsrc_soc_data {
+ const int *regs;
+ const struct dvfsrc_opp_desc *opps_desc;
+ int (*get_target_level)(struct mtk_dvfsrc *dvfsrc);
+ int (*get_current_level)(struct mtk_dvfsrc *dvfsrc);
+ u32 (*get_vcore_level)(struct mtk_dvfsrc *dvfsrc);
+ u32 (*get_vcp_level)(struct mtk_dvfsrc *dvfsrc);
+ void (*set_dram_bw)(struct mtk_dvfsrc *dvfsrc, u64 bw);
+ void (*set_dram_peak_bw)(struct mtk_dvfsrc *dvfsrc, u64 bw);
+ void (*set_dram_hrtbw)(struct mtk_dvfsrc *dvfsrc, u64 bw);
+ void (*set_opp_level)(struct mtk_dvfsrc *dvfsrc, u32 level);
+ void (*set_vcore_level)(struct mtk_dvfsrc *dvfsrc, u32 level);
+ void (*set_vscp_level)(struct mtk_dvfsrc *dvfsrc, u32 level);
+ int (*wait_for_opp_level)(struct mtk_dvfsrc *dvfsrc, u32 level);
+ int (*wait_for_vcore_level)(struct mtk_dvfsrc *dvfsrc, u32 level);
+};
+
+struct mtk_dvfsrc {
+ struct device *dev;
+ struct platform_device *icc;
+ struct platform_device *regulator;
+ const struct dvfsrc_soc_data *dvd;
+ int dram_type;
+ const struct dvfsrc_opp_desc *curr_opps;
+ void __iomem *regs;
+ spinlock_t req_lock;
+ struct mutex pstate_lock;
+ struct notifier_block scpsys_notifier;
+};
+
+static u32 dvfsrc_read(struct mtk_dvfsrc *dvfs, u32 offset)
+{
+ return readl(dvfs->regs + dvfs->dvd->regs[offset]);
+}
+
+static void dvfsrc_write(struct mtk_dvfsrc *dvfs, u32 offset, u32 val)
+{
+ writel(val, dvfs->regs + dvfs->dvd->regs[offset]);
+}
+
+#define dvfsrc_rmw(dvfs, offset, val, mask, shift) \
+ dvfsrc_write(dvfs, offset, \
+ (dvfsrc_read(dvfs, offset) & ~(mask << shift)) | (val << shift))
+
+enum dvfsrc_regs {
+ DVFSRC_SW_REQ,
+ DVFSRC_SW_REQ2,
+ DVFSRC_LEVEL,
+ DVFSRC_TARGET_LEVEL,
+ DVFSRC_SW_BW,
+ DVFSRC_SW_PEAK_BW,
+ DVFSRC_SW_HRT_BW,
+ DVFSRC_VCORE_REQUEST,
+};
+
+static const int mt8183_regs[] = {
+ [DVFSRC_SW_REQ] = 0x4,
+ [DVFSRC_SW_REQ2] = 0x8,
+ [DVFSRC_LEVEL] = 0xDC,
+ [DVFSRC_SW_BW] = 0x160,
+};
+
+static const struct dvfsrc_opp *get_current_opp(struct mtk_dvfsrc *dvfsrc)
+{
+ int level;
+
+ level = dvfsrc->dvd->get_current_level(dvfsrc);
+ return &dvfsrc->curr_opps->opps[level];
+}
+
+static int dvfsrc_is_idle(struct mtk_dvfsrc *dvfsrc)
+{
+ if (!dvfsrc->dvd->get_target_level)
+ return true;
+
+ return dvfsrc->dvd->get_target_level(dvfsrc);
+}
+
+static int dvfsrc_wait_for_vcore_level(struct mtk_dvfsrc *dvfsrc, u32 level)
+{
+ const struct dvfsrc_opp *curr;
+
+ return readx_poll_timeout_atomic(get_current_opp, dvfsrc, curr,
+ curr->vcore_opp >= level, STARTUP_TIME,
+ POLL_TIMEOUT);
+}
+
+static int mt8183_wait_for_opp_level(struct mtk_dvfsrc *dvfsrc, u32 level)
+{
+ const struct dvfsrc_opp *target, *curr;
+ int ret;
+
+ target = &dvfsrc->curr_opps->opps[level];
+ ret = readx_poll_timeout(get_current_opp, dvfsrc, curr,
+ curr->dram_opp >= target->dram_opp &&
+ curr->vcore_opp >= target->vcore_opp,
+ STARTUP_TIME, POLL_TIMEOUT);
+ if (ret < 0) {
+ dev_warn(dvfsrc->dev,
+ "timeout, target: %u, dram: %d, vcore: %d\n", level,
+ curr->dram_opp, curr->vcore_opp);
+ return ret;
+ }
+
+ return 0;
+}
+
+static int mt8183_get_target_level(struct mtk_dvfsrc *dvfsrc)
+{
+ return DVFSRC_GET_TARGET_LEVEL(dvfsrc_read(dvfsrc, DVFSRC_LEVEL));
+}
+
+static int mt8183_get_current_level(struct mtk_dvfsrc *dvfsrc)
+{
+ int level;
+
+ /* HW level 0 is begin from 0x10000 */
+ level = DVFSRC_GET_CURRENT_LEVEL(dvfsrc_read(dvfsrc, DVFSRC_LEVEL));
+ /* Array index start from 0 */
+ return ffs(level) - 1;
+}
+
+static u32 mt8183_get_vcore_level(struct mtk_dvfsrc *dvfsrc)
+{
+ return (dvfsrc_read(dvfsrc, DVFSRC_SW_REQ2) >> 2) & 0x3;
+}
+
+static void mt8183_set_dram_bw(struct mtk_dvfsrc *dvfsrc, u64 bw)
+{
+ dvfsrc_write(dvfsrc, DVFSRC_SW_BW, div_u64(kbps_to_mbps(bw), 100));
+}
+
+static void mt8183_set_opp_level(struct mtk_dvfsrc *dvfsrc, u32 level)
+{
+ int vcore_opp, dram_opp;
+ const struct dvfsrc_opp *opp;
+
+ /* translate pstate to dvfsrc level, and set it to DVFSRC HW */
+ opp = &dvfsrc->curr_opps->opps[level];
+ vcore_opp = opp->vcore_opp;
+ dram_opp = opp->dram_opp;
+
+ dev_dbg(dvfsrc->dev, "vcore_opp: %d, dram_opp: %d\n",
+ vcore_opp, dram_opp);
+ dvfsrc_write(dvfsrc, DVFSRC_SW_REQ, dram_opp | vcore_opp << 2);
+}
+
+static void mt8183_set_vcore_level(struct mtk_dvfsrc *dvfsrc, u32 level)
+{
+ dvfsrc_write(dvfsrc, DVFSRC_SW_REQ2, level << 2);
+}
+
+void mtk_dvfsrc_send_request(const struct device *dev, u32 cmd, u64 data)
+{
+ int ret, state;
+ struct mtk_dvfsrc *dvfsrc = dev_get_drvdata(dev);
+
+ dev_dbg(dvfsrc->dev, "cmd: %d, data: %llu\n", cmd, data);
+
+ switch (cmd) {
+ case MTK_DVFSRC_CMD_BW_REQUEST:
+ dvfsrc->dvd->set_dram_bw(dvfsrc, data);
+ return;
+ case MTK_DVFSRC_CMD_PEAK_BW_REQUEST:
+ if (dvfsrc->dvd->set_dram_peak_bw)
+ dvfsrc->dvd->set_dram_peak_bw(dvfsrc, data);
+ return;
+ case MTK_DVFSRC_CMD_OPP_REQUEST:
+ if (dvfsrc->dvd->set_opp_level)
+ dvfsrc->dvd->set_opp_level(dvfsrc, data);
+ break;
+ case MTK_DVFSRC_CMD_VCORE_REQUEST:
+ dvfsrc->dvd->set_vcore_level(dvfsrc, data);
+ break;
+ case MTK_DVFSRC_CMD_HRTBW_REQUEST:
+ if (dvfsrc->dvd->set_dram_hrtbw)
+ dvfsrc->dvd->set_dram_hrtbw(dvfsrc, data);
+ else
+ return;
+ break;
+ case MTK_DVFSRC_CMD_VSCP_REQUEST:
+ dvfsrc->dvd->set_vscp_level(dvfsrc, data);
+ break;
+ default:
+ dev_err(dvfsrc->dev, "unknown command: %d\n", cmd);
+ return;
+ }
+
+ /* DVFSRC need to wait at least 2T(~196ns) to handle request
+ * after recieving command
+ */
+ udelay(STARTUP_TIME);
+
+ ret = readx_poll_timeout(dvfsrc_is_idle, dvfsrc,
+ state, state == DVFSRC_IDLE,
+ STARTUP_TIME, POLL_TIMEOUT);
+
+ if (ret < 0) {
+ dev_warn(dvfsrc->dev,
+ "%d: idle timeout, data: %llu, last: %d -> %d\n",
+ cmd, data,
+ dvfsrc->dvd->get_current_level(dvfsrc),
+ dvfsrc->dvd->get_target_level(dvfsrc));
+ return;
+ }
+
+ /* The previous change may be requested by previous request.
+ * So we delay 1us, then start checking opp is reached enough.
+ */
+ udelay(STARTUP_TIME);
+
+ if (cmd == MTK_DVFSRC_CMD_OPP_REQUEST)
+ ret = dvfsrc->dvd->wait_for_opp_level(dvfsrc, data);
+ else
+ ret = dvfsrc->dvd->wait_for_vcore_level(dvfsrc, data);
+
+ if (ret < 0) {
+ dev_warn(dvfsrc->dev,
+ "%d: wait timeout, data: %llu, last: %d -> %d\n",
+ cmd, data,
+ dvfsrc->dvd->get_current_level(dvfsrc),
+ dvfsrc->dvd->get_target_level(dvfsrc));
+ }
+
+}
+EXPORT_SYMBOL(mtk_dvfsrc_send_request);
+
+int mtk_dvfsrc_query_info(const struct device *dev, u32 cmd, int *data)
+{
+ struct mtk_dvfsrc *dvfsrc = dev_get_drvdata(dev);
+
+ switch (cmd) {
+ case MTK_DVFSRC_CMD_VCORE_LEVEL_QUERY:
+ *data = dvfsrc->dvd->get_vcore_level(dvfsrc);
+ break;
+ case MTK_DVFSRC_CMD_VSCP_LEVEL_QUERY:
+ *data = dvfsrc->dvd->get_vcp_level(dvfsrc);
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ return 0;
+}
+EXPORT_SYMBOL(mtk_dvfsrc_query_info);
+
+static int mtk_dvfsrc_probe(struct platform_device *pdev)
+{
+ struct arm_smccc_res ares;
+ struct resource *res;
+ struct mtk_dvfsrc *dvfsrc;
+ int ret;
+
+ dvfsrc = devm_kzalloc(&pdev->dev, sizeof(*dvfsrc), GFP_KERNEL);
+ if (!dvfsrc)
+ return -ENOMEM;
+
+ dvfsrc->dvd = of_device_get_match_data(&pdev->dev);
+ dvfsrc->dev = &pdev->dev;
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ dvfsrc->regs = devm_ioremap_resource(&pdev->dev, res);
+ if (IS_ERR(dvfsrc->regs))
+ return PTR_ERR(dvfsrc->regs);
+
+ spin_lock_init(&dvfsrc->req_lock);
+ mutex_init(&dvfsrc->pstate_lock);
+
+ arm_smccc_smc(MTK_SIP_VCOREFS_CONTROL, MTK_SIP_DVFSRC_INIT, 0, 0, 0,
+ 0, 0, 0, &ares);
+
+ if (!ares.a0) {
+ dvfsrc->dram_type = ares.a1;
+ dev_info(dvfsrc->dev, "dram_type: %d\n", dvfsrc->dram_type);
+ } else {
+ dev_err(dvfsrc->dev, "init fails: %lu\n", ares.a0);
+ return ares.a0;
+ }
+
+ dvfsrc->curr_opps = &dvfsrc->dvd->opps_desc[dvfsrc->dram_type];
+ platform_set_drvdata(pdev, dvfsrc);
+
+ dvfsrc->regulator = platform_device_register_data(dvfsrc->dev,
+ "mtk-dvfsrc-regulator", -1, NULL, 0);
+ if (IS_ERR(dvfsrc->regulator)) {
+ dev_err(dvfsrc->dev, "Failed create regulator device\n");
+ ret = PTR_ERR(dvfsrc->regulator);
+ goto err;
+ }
+
+ dvfsrc->icc = platform_device_register_data(dvfsrc->dev,
+ "mediatek-emi-icc", -1, NULL, 0);
+ if (IS_ERR(dvfsrc->icc)) {
+ dev_err(dvfsrc->dev, "Failed create icc device\n");
+ ret = PTR_ERR(dvfsrc->icc);
+ goto unregister_regulator;
+ }
+
+ ret = devm_of_platform_populate(&pdev->dev);
+ if (ret)
+ platform_device_unregister(dvfsrc->icc);
+
+ return 0;
+
+unregister_regulator:
+ platform_device_unregister(dvfsrc->regulator);
+err:
+ return ret;
+}
+
+static const struct dvfsrc_opp dvfsrc_opp_mt8183_lp4[] = {
+ {0, 0}, {0, 1}, {0, 2}, {1, 2},
+};
+
+static const struct dvfsrc_opp dvfsrc_opp_mt8183_lp3[] = {
+ {0, 0}, {0, 1}, {1, 1}, {1, 2},
+};
+
+static const struct dvfsrc_opp_desc dvfsrc_opp_mt8183_desc[] = {
+ DVFSRC_OPP_DESC(dvfsrc_opp_mt8183_lp4),
+ DVFSRC_OPP_DESC(dvfsrc_opp_mt8183_lp3),
+ DVFSRC_OPP_DESC(dvfsrc_opp_mt8183_lp3),
+};
+
+static const struct dvfsrc_soc_data mt8183_data = {
+ .opps_desc = dvfsrc_opp_mt8183_desc,
+ .regs = mt8183_regs,
+ .get_target_level = mt8183_get_target_level,
+ .get_current_level = mt8183_get_current_level,
+ .get_vcore_level = mt8183_get_vcore_level,
+ .set_dram_bw = mt8183_set_dram_bw,
+ .set_opp_level = mt8183_set_opp_level,
+ .set_vcore_level = mt8183_set_vcore_level,
+ .wait_for_opp_level = mt8183_wait_for_opp_level,
+ .wait_for_vcore_level = dvfsrc_wait_for_vcore_level,
+};
+
+static int mtk_dvfsrc_remove(struct platform_device *pdev)
+{
+ struct mtk_dvfsrc *dvfsrc = platform_get_drvdata(pdev);
+
+ platform_device_unregister(dvfsrc->regulator);
+ platform_device_unregister(dvfsrc->icc);
+
+ return 0;
+}
+
+static const struct of_device_id mtk_dvfsrc_of_match[] = {
+ {
+ .compatible = "mediatek,mt8183-dvfsrc",
+ .data = &mt8183_data,
+ }, {
+ /* sentinel */
+ },
+};
+
+static struct platform_driver mtk_dvfsrc_driver = {
+ .probe = mtk_dvfsrc_probe,
+ .remove = mtk_dvfsrc_remove,
+ .driver = {
+ .name = "mtk-dvfsrc",
+ .of_match_table = of_match_ptr(mtk_dvfsrc_of_match),
+ },
+};
+
+static int __init mtk_dvfsrc_init(void)
+{
+ return platform_driver_register(&mtk_dvfsrc_driver);
+}
+subsys_initcall(mtk_dvfsrc_init);
+
+static void __exit mtk_dvfsrc_exit(void)
+{
+ platform_driver_unregister(&mtk_dvfsrc_driver);
+}
+module_exit(mtk_dvfsrc_exit);
+
+MODULE_LICENSE("GPL v2");
+MODULE_DESCRIPTION("MTK DVFSRC driver");
diff --git a/include/linux/soc/mediatek/mtk_dvfsrc.h b/include/linux/soc/mediatek/mtk_dvfsrc.h
new file mode 100644
index 0000000..823eff9
--- /dev/null
+++ b/include/linux/soc/mediatek/mtk_dvfsrc.h
@@ -0,0 +1,35 @@
+/* SPDX-License-Identifier: GPL-2.0
+ *
+ * Copyright (c) 2021 MediaTek Inc.
+ */
+
+#ifndef __SOC_MTK_DVFSRC_H
+#define __SOC_MTK_DVFSRC_H
+
+#define MTK_DVFSRC_CMD_BW_REQUEST 0
+#define MTK_DVFSRC_CMD_OPP_REQUEST 1
+#define MTK_DVFSRC_CMD_VCORE_REQUEST 2
+#define MTK_DVFSRC_CMD_HRTBW_REQUEST 3
+#define MTK_DVFSRC_CMD_VSCP_REQUEST 4
+#define MTK_DVFSRC_CMD_PEAK_BW_REQUEST 5
+
+#define MTK_DVFSRC_CMD_VCORE_LEVEL_QUERY 0
+#define MTK_DVFSRC_CMD_VSCP_LEVEL_QUERY 1
+
+#if IS_ENABLED(CONFIG_MTK_DVFSRC)
+void mtk_dvfsrc_send_request(const struct device *dev, u32 cmd, u64 data);
+int mtk_dvfsrc_query_info(const struct device *dev, u32 cmd, int *data);
+
+#else
+
+static inline void mtk_dvfsrc_send_request(const struct device *dev, u32 cmd,
+ u64 data)
+{ return -ENODEV; }
+
+static inline int mtk_dvfsrc_query_info(const struct device *dev, u32 cmd,
+ int *data);
+{ return -ENODEV; }
+
+#endif /* CONFIG_MTK_DVFSRC */
+
+#endif