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Subject[RFC PATCH 6/7] soc: mediatek: add MT8183 dvfsrc support
Date
Add dvfsrc driver for MT8183

Signed-off-by: Henry Chen <henryc.chen@mediatek.com>
---
drivers/soc/mediatek/Kconfig | 15 ++
drivers/soc/mediatek/Makefile | 1 +
drivers/soc/mediatek/mtk-dvfsrc.c | 473 ++++++++++++++++++++++++++++++++++++++
3 files changed, 489 insertions(+)
create mode 100644 drivers/soc/mediatek/mtk-dvfsrc.c

diff --git a/drivers/soc/mediatek/Kconfig b/drivers/soc/mediatek/Kconfig
index a7d0667..f956f03 100644
--- a/drivers/soc/mediatek/Kconfig
+++ b/drivers/soc/mediatek/Kconfig
@@ -12,6 +12,21 @@ config MTK_INFRACFG
INFRACFG controller contains various infrastructure registers not
directly associated to any device.

+config MTK_DVFSRC
+ bool "MediaTek DVFSRC Support"
+ depends on ARCH_MEDIATEK
+ default ARCH_MEDIATEK
+ select REGMAP
+ select MTK_INFRACFG
+ select PM_GENERIC_DOMAINS if PM
+ depends on MTK_SCPSYS
+ help
+ Say yes here to add support for the MediaTek DVFSRC 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_PMIC_WRAP
tristate "MediaTek PMIC Wrapper Support"
depends on RESET_CONTROLLER
diff --git a/drivers/soc/mediatek/Makefile b/drivers/soc/mediatek/Makefile
index 9dc6670..5c010b9 100644
--- a/drivers/soc/mediatek/Makefile
+++ b/drivers/soc/mediatek/Makefile
@@ -1,3 +1,4 @@
+obj-$(CONFIG_MTK_DVFSRC) += mtk-dvfsrc.o
obj-$(CONFIG_MTK_INFRACFG) += mtk-infracfg.o mtk-scpsys-ext.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..af462a3
--- /dev/null
+++ b/drivers/soc/mediatek/mtk-dvfsrc.c
@@ -0,0 +1,473 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) 2018 MediaTek Inc.
+ */
+#include <linux/arm-smccc.h>
+#include <linux/clk.h>
+#include <linux/interrupt.h>
+#include <linux/io.h>
+#include <linux/irq.h>
+#include <linux/delay.h>
+#include <linux/kthread.h>
+#include <linux/module.h>
+#include <linux/notifier.h>
+#include <linux/of_device.h>
+#include <linux/platform_device.h>
+#include <linux/pm_qos.h>
+#include <linux/slab.h>
+#include <linux/spinlock.h>
+#include <soc/mediatek/mtk_sip.h>
+#include <dt-bindings/power/mt8183-power.h>
+#include <dt-bindings/soc/mtk,dvfsrc.h>
+#include "mtk-scpsys.h"
+
+#define DVFSRC_IDLE 0x00
+#define DVFSRC_GET_TARGET_LEVEL(x) (((x) >> 0) & 0x0000ffff)
+#define DVFSRC_GET_CURRENT_LEVEL(x) (((x) >> 16) & 0x0000ffff)
+
+/* macro for irq */
+#define DVFSRC_IRQ_TIMEOUT_EN BIT(1)
+
+struct dvfsrc_opp {
+ int vcore_opp;
+ int dram_opp;
+};
+
+struct dvfsrc_domain {
+ int id;
+ int state;
+};
+
+struct mtk_dvfsrc;
+struct dvfsrc_soc_data {
+ const int *regs;
+ int num_opp;
+ int num_domains;
+ int dram_sft;
+ int vcore_sft;
+ const struct dvfsrc_opp **opps;
+ struct dvfsrc_domain *domains;
+ void (*init_soc)(struct mtk_dvfsrc *dvfsrc);
+ int (*get_target_level)(struct mtk_dvfsrc *dvfsrc);
+ int (*get_current_level)(struct mtk_dvfsrc *dvfsrc);
+};
+
+struct mtk_dvfsrc {
+ struct device *dev;
+ struct clk *clk_dvfsrc;
+ const struct dvfsrc_soc_data *dvd;
+ int dram_type;
+ int irq;
+ void __iomem *regs;
+ struct mutex lock; /* generic mutex for dvfsrc driver */
+
+ struct notifier_block qos_notifier;
+ 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]);
+}
+
+enum dvfsrc_regs {
+ DVFSRC_BASIC_CONTROL,
+ DVFSRC_SW_REQ,
+ DVFSRC_SW_REQ2,
+ DVFSRC_EMI_REQUEST,
+ DVFSRC_EMI_REQUEST2,
+ DVFSRC_EMI_REQUEST3,
+ DVFSRC_EMI_QOS0,
+ DVFSRC_EMI_QOS1,
+ DVFSRC_EMI_QOS2,
+ DVFSRC_EMI_MD2SPM0,
+ DVFSRC_EMI_MD2SPM1,
+ DVFSRC_VCORE_REQUEST,
+ DVFSRC_VCORE_REQUEST2,
+ DVFSRC_VCORE_MD2SPM0,
+ DVFSRC_INT,
+ DVFSRC_INT_EN,
+ DVFSRC_INT_CLR,
+ DVFSRC_TIMEOUT_NEXTREQ,
+ DVFSRC_LEVEL,
+ DVFSRC_LEVEL_LABEL_0_1,
+ DVFSRC_LEVEL_LABEL_2_3,
+ DVFSRC_LEVEL_LABEL_4_5,
+ DVFSRC_LEVEL_LABEL_6_7,
+ DVFSRC_LEVEL_LABEL_8_9,
+ DVFSRC_LEVEL_LABEL_10_11,
+ DVFSRC_LEVEL_LABEL_12_13,
+ DVFSRC_LEVEL_LABEL_14_15,
+ DVFSRC_SW_BW_0,
+ DVFSRC_QOS_EN,
+ DVFSRC_FORCE,
+ DVFSRC_LAST,
+ DVFSRC_RSRV_0,
+ DVFSRC_RSRV_1,
+};
+
+static int mt8183_regs[] = {
+ [DVFSRC_BASIC_CONTROL] = 0x0,
+ [DVFSRC_SW_REQ] = 0x4,
+ [DVFSRC_SW_REQ2] = 0x8,
+ [DVFSRC_EMI_REQUEST] = 0xC,
+ [DVFSRC_EMI_REQUEST2] = 0x10,
+ [DVFSRC_EMI_REQUEST3] = 0x14,
+ [DVFSRC_EMI_QOS0] = 0x24,
+ [DVFSRC_EMI_QOS1] = 0x28,
+ [DVFSRC_EMI_QOS2] = 0x2C,
+ [DVFSRC_EMI_MD2SPM0] = 0x30,
+ [DVFSRC_EMI_MD2SPM1] = 0x34,
+ [DVFSRC_VCORE_REQUEST] = 0x48,
+ [DVFSRC_VCORE_REQUEST2] = 0x4C,
+ [DVFSRC_VCORE_MD2SPM0] = 0x68,
+ [DVFSRC_INT] = 0x98,
+ [DVFSRC_INT_EN] = 0x9C,
+ [DVFSRC_INT_CLR] = 0xA0,
+ [DVFSRC_TIMEOUT_NEXTREQ] = 0xD8,
+ [DVFSRC_LEVEL] = 0xDC,
+ [DVFSRC_LEVEL_LABEL_0_1] = 0xE0,
+ [DVFSRC_LEVEL_LABEL_2_3] = 0xE4,
+ [DVFSRC_LEVEL_LABEL_4_5] = 0xE8,
+ [DVFSRC_LEVEL_LABEL_6_7] = 0xEC,
+ [DVFSRC_LEVEL_LABEL_8_9] = 0xF0,
+ [DVFSRC_LEVEL_LABEL_10_11] = 0xF4,
+ [DVFSRC_LEVEL_LABEL_12_13] = 0xF8,
+ [DVFSRC_LEVEL_LABEL_14_15] = 0xFC,
+ [DVFSRC_SW_BW_0] = 0x160,
+ [DVFSRC_QOS_EN] = 0x180,
+ [DVFSRC_FORCE] = 0x300,
+ [DVFSRC_LAST] = 0x308,
+ [DVFSRC_RSRV_0] = 0x600,
+ [DVFSRC_RSRV_1] = 0x604,
+};
+
+static bool dvfsrc_is_idle(struct mtk_dvfsrc *dvfsrc)
+{
+ int val = 0;
+
+ if (dvfsrc->dvd->get_target_level)
+ val = dvfsrc->dvd->get_target_level(dvfsrc);
+
+ return val == DVFSRC_IDLE;
+}
+
+static int dvfsrc_wait_for_state(struct mtk_dvfsrc *dvfsrc,
+ bool (*fp)(struct mtk_dvfsrc *))
+{
+ unsigned long timeout;
+
+ timeout = jiffies + usecs_to_jiffies(1000);
+
+ do {
+ if (fp(dvfsrc))
+ return 0;
+ } while (!time_after(jiffies, timeout));
+
+ return -ETIMEDOUT;
+}
+
+static void mtk_dvfsrc_mt8183_init(struct mtk_dvfsrc *dvfsrc)
+{
+ struct arm_smccc_res res;
+
+ mutex_lock(&dvfsrc->lock);
+
+ arm_smccc_smc(MTK_SIP_SPM, MTK_SIP_SPM_DVFSRC_INIT, 0, 0, 0, 0, 0, 0,
+ &res);
+
+ dvfsrc_write(dvfsrc, DVFSRC_LEVEL_LABEL_0_1, 0x00100000);
+
+ dvfsrc_write(dvfsrc, DVFSRC_LEVEL_LABEL_2_3, 0x00210011);
+ dvfsrc_write(dvfsrc, DVFSRC_LEVEL_LABEL_4_5, 0x01100100);
+ dvfsrc_write(dvfsrc, DVFSRC_LEVEL_LABEL_6_7, 0x01210111);
+ dvfsrc_write(dvfsrc, DVFSRC_LEVEL_LABEL_8_9, 0x02100200);
+ dvfsrc_write(dvfsrc, DVFSRC_LEVEL_LABEL_10_11, 0x02210211);
+ dvfsrc_write(dvfsrc, DVFSRC_LEVEL_LABEL_12_13, 0x03210321);
+ dvfsrc_write(dvfsrc, DVFSRC_LEVEL_LABEL_14_15, 0x03210321);
+
+ /* EMI/VCORE HRT, MD2SPM, BW setting */
+ dvfsrc_write(dvfsrc, DVFSRC_EMI_QOS0, 0x32);
+ dvfsrc_write(dvfsrc, DVFSRC_EMI_QOS1, 0x66);
+ dvfsrc_write(dvfsrc, DVFSRC_EMI_MD2SPM0, 0x80F8);
+ dvfsrc_write(dvfsrc, DVFSRC_EMI_MD2SPM1, 0x0);
+ dvfsrc_write(dvfsrc, DVFSRC_VCORE_MD2SPM0, 0x80C0);
+
+ dvfsrc_write(dvfsrc, DVFSRC_RSRV_1, 0x0000001C);
+ dvfsrc_write(dvfsrc, DVFSRC_TIMEOUT_NEXTREQ, 0x00000013);
+ dvfsrc_write(dvfsrc, DVFSRC_INT_EN, 0x2);
+
+ dvfsrc_write(dvfsrc, DVFSRC_EMI_REQUEST, 0x00290209);
+ dvfsrc_write(dvfsrc, DVFSRC_EMI_REQUEST2, 0);
+
+ dvfsrc_write(dvfsrc, DVFSRC_VCORE_REQUEST, 0x00150000);
+
+ dvfsrc_write(dvfsrc, DVFSRC_QOS_EN, 0x0000407F);
+ dvfsrc_write(dvfsrc, DVFSRC_EMI_REQUEST3, 0x09000000);
+
+ dvfsrc_write(dvfsrc, DVFSRC_FORCE, 0x00400000);
+ dvfsrc_write(dvfsrc, DVFSRC_BASIC_CONTROL, 0x0000C07B);
+ dvfsrc_write(dvfsrc, DVFSRC_BASIC_CONTROL, 0x0000017B);
+
+ dvfsrc_write(dvfsrc, DVFSRC_VCORE_REQUEST,
+ (dvfsrc_read(dvfsrc, DVFSRC_VCORE_REQUEST)
+ & ~(0x3 << 20)));
+ dvfsrc_write(dvfsrc, DVFSRC_EMI_REQUEST,
+ (dvfsrc_read(dvfsrc, DVFSRC_EMI_REQUEST)
+ & ~(0x3 << 20)));
+
+ mutex_unlock(&dvfsrc->lock);
+}
+
+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)
+{
+ return DVFSRC_GET_CURRENT_LEVEL(dvfsrc_read(dvfsrc, DVFSRC_LEVEL));
+}
+
+static int get_cur_performance_level(struct mtk_dvfsrc *dvfsrc)
+{
+ int bit = 0;
+
+ if (dvfsrc->dvd->get_current_level)
+ bit = dvfsrc->dvd->get_current_level(dvfsrc);
+
+ return ffs(bit);
+}
+
+static int pm_qos_memory_bw_notify(struct notifier_block *b,
+ unsigned long bw, void *v)
+{
+ struct mtk_dvfsrc *dvfsrc;
+
+ dvfsrc = container_of(b, struct mtk_dvfsrc, qos_notifier);
+ mutex_lock(&dvfsrc->lock);
+
+ dev_dbg(dvfsrc->dev, "data: 0x%lx\n", bw);
+ dvfsrc_write(dvfsrc, DVFSRC_SW_BW_0, bw / 100);
+
+ mutex_unlock(&dvfsrc->lock);
+
+ return NOTIFY_OK;
+}
+
+static int dvfsrc_set_performace(struct notifier_block *b,
+ unsigned long l, void *v)
+{
+ int i, val, highest = 0, vcore_opp = 0, dram_opp = 0;
+ struct mtk_dvfsrc *dvfsrc;
+ struct scp_event_data *sc = v;
+ struct dvfsrc_domain *d;
+
+ if (sc->event_type != MTK_SCPSYS_PSTATE)
+ return 0;
+
+ dvfsrc = container_of(b, struct mtk_dvfsrc, scpsys_notifier);
+
+ mutex_lock(&dvfsrc->lock);
+ d = dvfsrc->dvd->domains;
+
+ if (l > dvfsrc->dvd->num_opp || l <= 0) {
+ dev_err(dvfsrc->dev, "pstate out of range = %ld\n", l);
+ goto out;
+ }
+
+ for (i = 0, highest = 0; i < dvfsrc->dvd->num_domains - 1; i++, d++) {
+ if (sc->domain_id == d->id)
+ d->state = l;
+ if (d->state > highest)
+ highest = d->state;
+ }
+
+ if (highest == 0) {
+ dev_err(dvfsrc->dev, "domain not match\n");
+ goto out;
+ }
+
+ /* translate pstate to dvfsrc level, and set it to DVFSRC HW */
+ vcore_opp =
+ dvfsrc->dvd->opps[dvfsrc->dram_type][highest - 1].vcore_opp;
+ dram_opp = dvfsrc->dvd->opps[dvfsrc->dram_type][highest - 1].dram_opp;
+
+ if (dvfsrc_wait_for_state(dvfsrc, dvfsrc_is_idle)) {
+ dev_warn(dvfsrc->dev, "[%s] wait idle, last: %d -> %d\n",
+ __func__, dvfsrc_read(dvfsrc, DVFSRC_LEVEL),
+ dvfsrc_read(dvfsrc, DVFSRC_LAST));
+ goto out;
+ }
+
+ dvfsrc_write(dvfsrc, DVFSRC_SW_REQ,
+ dram_opp << dvfsrc->dvd->dram_sft |
+ vcore_opp << dvfsrc->dvd->vcore_sft);
+
+ if (dvfsrc_wait_for_state(dvfsrc, dvfsrc_is_idle)) {
+ dev_warn(dvfsrc->dev, "[%s] wait idle, last: %d -> %d\n",
+ __func__, dvfsrc_read(dvfsrc, DVFSRC_LEVEL),
+ dvfsrc_read(dvfsrc, DVFSRC_LAST));
+ goto out;
+ }
+
+ val = get_cur_performance_level(dvfsrc);
+ if (val < highest) {
+ dev_err(dvfsrc->dev, "current: %d < hightest: %x\n",
+ highest, val);
+ }
+out:
+ mutex_unlock(&dvfsrc->lock);
+
+ return 0;
+}
+
+static void pstate_notifier_register(struct mtk_dvfsrc *dvfsrc)
+{
+ dvfsrc->scpsys_notifier.notifier_call = dvfsrc_set_performace;
+ register_scpsys_notifier(&dvfsrc->scpsys_notifier);
+}
+
+static void pm_qos_notifier_register(struct mtk_dvfsrc *dvfsrc)
+{
+ dvfsrc->qos_notifier.notifier_call = pm_qos_memory_bw_notify;
+ pm_qos_add_notifier(PM_QOS_MEMORY_BANDWIDTH, &dvfsrc->qos_notifier);
+}
+
+static irqreturn_t mtk_dvfsrc_interrupt(int irq, void *dev_id)
+{
+ u32 val;
+ struct mtk_dvfsrc *dvfsrc = dev_id;
+
+ val = dvfsrc_read(dvfsrc, DVFSRC_INT);
+ dvfsrc_write(dvfsrc, DVFSRC_INT_CLR, val);
+ dvfsrc_write(dvfsrc, DVFSRC_INT_CLR, 0x0);
+ if (val & DVFSRC_IRQ_TIMEOUT_EN)
+ dev_warn(dvfsrc->dev, "timeout at spm = %x", val);
+
+ return IRQ_HANDLED;
+}
+
+static int mtk_dvfsrc_probe(struct platform_device *pdev)
+{
+ 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);
+
+ dvfsrc->clk_dvfsrc = devm_clk_get(dvfsrc->dev, "dvfsrc");
+ if (IS_ERR(dvfsrc->clk_dvfsrc)) {
+ dev_err(dvfsrc->dev, "failed to get clock: %ld\n",
+ PTR_ERR(dvfsrc->clk_dvfsrc));
+ return PTR_ERR(dvfsrc->clk_dvfsrc);
+ }
+
+ ret = clk_prepare_enable(dvfsrc->clk_dvfsrc);
+ if (ret)
+ return ret;
+
+ ret = of_property_read_u32(dvfsrc->dev->of_node, "dram_type",
+ &dvfsrc->dram_type);
+ if (ret) {
+ dev_err(dvfsrc->dev, "failed to get dram_type: %d\n", ret);
+ clk_disable_unprepare(dvfsrc->clk_dvfsrc);
+ return ret;
+ }
+
+ dvfsrc->irq = platform_get_irq(pdev, 0);
+ ret = request_irq(dvfsrc->irq, mtk_dvfsrc_interrupt
+ , IRQF_TRIGGER_HIGH, "dvfsrc", dvfsrc);
+ if (ret)
+ dev_dbg(dvfsrc->dev, "interrupt not use\n");
+
+ mutex_init(&dvfsrc->lock);
+ if (dvfsrc->dvd->init_soc)
+ dvfsrc->dvd->init_soc(dvfsrc);
+
+ pstate_notifier_register(dvfsrc);
+ pm_qos_notifier_register(dvfsrc);
+ platform_set_drvdata(pdev, dvfsrc);
+
+ return 0;
+}
+
+static const struct dvfsrc_opp dvfsrc_opp_mt8183_lp4[] = {
+ {0, 0}, {1, 0}, {1, 1}, {1, 2},
+};
+
+static const struct dvfsrc_opp dvfsrc_opp_mt8183_1p3[] = {
+ {0, 0}, {0, 1}, {1, 1}, {1, 2},
+};
+
+static const struct dvfsrc_opp *dvfsrc_opp_mt8183[] = {
+ [MT8183_DVFSRC_OPP_LP4] = dvfsrc_opp_mt8183_lp4,
+ [MT8183_DVFSRC_OPP_LP4X] = dvfsrc_opp_mt8183_1p3,
+ [MT8183_DVFSRC_OPP_LP3] = dvfsrc_opp_mt8183_1p3,
+};
+
+static struct dvfsrc_domain dvfsrc_domains_mt8183[] = {
+ {MT8183_POWER_DOMAIN_MFG_ASYNC, 0},
+ {MT8183_POWER_DOMAIN_MFG, 0},
+ {MT8183_POWER_DOMAIN_CAM, 0},
+ {MT8183_POWER_DOMAIN_DISP, 0},
+ {MT8183_POWER_DOMAIN_ISP, 0},
+ {MT8183_POWER_DOMAIN_VDEC, 0},
+ {MT8183_POWER_DOMAIN_VENC, 0},
+};
+
+static const struct dvfsrc_soc_data mt8183_data = {
+ .opps = dvfsrc_opp_mt8183,
+ .num_opp = ARRAY_SIZE(dvfsrc_opp_mt8183_lp4),
+ .regs = mt8183_regs,
+ .domains = dvfsrc_domains_mt8183,
+ .num_domains = ARRAY_SIZE(dvfsrc_domains_mt8183),
+ .init_soc = mtk_dvfsrc_mt8183_init,
+ .get_target_level = mt8183_get_target_level,
+ .get_current_level = mt8183_get_current_level,
+ .dram_sft = 0,
+ .vcore_sft = 2,
+};
+
+static int mtk_dvfsrc_remove(struct platform_device *pdev)
+{
+ 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),
+ },
+};
+
+builtin_platform_driver(mtk_dvfsrc_driver);
+
+MODULE_LICENSE("GPL v2");
+MODULE_DESCRIPTION("MTK DVFSRC driver");
--
1.9.1
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