diff options
| -rw-r--r-- | drivers/soc/mediatek/mtk-mmsys.c | 68 | ||||
| -rw-r--r-- | drivers/soc/mediatek/mtk-mmsys.h | 2 |
2 files changed, 70 insertions, 0 deletions
diff --git a/drivers/soc/mediatek/mtk-mmsys.c b/drivers/soc/mediatek/mtk-mmsys.c index 5ecfe09a5751..1e448f1ffefb 100644 --- a/drivers/soc/mediatek/mtk-mmsys.c +++ b/drivers/soc/mediatek/mtk-mmsys.c @@ -4,10 +4,12 @@ * Author: James Liao <jamesjj.liao@mediatek.com> */ +#include <linux/delay.h> #include <linux/device.h> #include <linux/io.h> #include <linux/of_device.h> #include <linux/platform_device.h> +#include <linux/reset-controller.h> #include <linux/soc/mediatek/mtk-mmsys.h> #include "mtk-mmsys.h" @@ -69,6 +71,8 @@ static const struct mtk_mmsys_driver_data mt8365_mmsys_driver_data = { struct mtk_mmsys { void __iomem *regs; const struct mtk_mmsys_driver_data *data; + spinlock_t lock; /* protects mmsys_sw_rst_b reg */ + struct reset_controller_dev rcdev; }; void mtk_mmsys_ddp_connect(struct device *dev, @@ -108,6 +112,58 @@ void mtk_mmsys_ddp_disconnect(struct device *dev, } EXPORT_SYMBOL_GPL(mtk_mmsys_ddp_disconnect); +static int mtk_mmsys_reset_update(struct reset_controller_dev *rcdev, unsigned long id, + bool assert) +{ + struct mtk_mmsys *mmsys = container_of(rcdev, struct mtk_mmsys, rcdev); + unsigned long flags; + u32 reg; + + spin_lock_irqsave(&mmsys->lock, flags); + + reg = readl_relaxed(mmsys->regs + MMSYS_SW0_RST_B); + + if (assert) + reg &= ~BIT(id); + else + reg |= BIT(id); + + writel_relaxed(reg, mmsys->regs + MMSYS_SW0_RST_B); + + spin_unlock_irqrestore(&mmsys->lock, flags); + + return 0; +} + +static int mtk_mmsys_reset_assert(struct reset_controller_dev *rcdev, unsigned long id) +{ + return mtk_mmsys_reset_update(rcdev, id, true); +} + +static int mtk_mmsys_reset_deassert(struct reset_controller_dev *rcdev, unsigned long id) +{ + return mtk_mmsys_reset_update(rcdev, id, false); +} + +static int mtk_mmsys_reset(struct reset_controller_dev *rcdev, unsigned long id) +{ + int ret; + + ret = mtk_mmsys_reset_assert(rcdev, id); + if (ret) + return ret; + + usleep_range(1000, 1100); + + return mtk_mmsys_reset_deassert(rcdev, id); +} + +static const struct reset_control_ops mtk_mmsys_reset_ops = { + .assert = mtk_mmsys_reset_assert, + .deassert = mtk_mmsys_reset_deassert, + .reset = mtk_mmsys_reset, +}; + static int mtk_mmsys_probe(struct platform_device *pdev) { struct device *dev = &pdev->dev; @@ -127,6 +183,18 @@ static int mtk_mmsys_probe(struct platform_device *pdev) return ret; } + spin_lock_init(&mmsys->lock); + + mmsys->rcdev.owner = THIS_MODULE; + mmsys->rcdev.nr_resets = 32; + mmsys->rcdev.ops = &mtk_mmsys_reset_ops; + mmsys->rcdev.of_node = pdev->dev.of_node; + ret = devm_reset_controller_register(&pdev->dev, &mmsys->rcdev); + if (ret) { + dev_err(&pdev->dev, "Couldn't register mmsys reset controller: %d\n", ret); + return ret; + } + mmsys->data = of_device_get_match_data(&pdev->dev); platform_set_drvdata(pdev, mmsys); diff --git a/drivers/soc/mediatek/mtk-mmsys.h b/drivers/soc/mediatek/mtk-mmsys.h index 9e2b81bd38db..8b0ed05117ea 100644 --- a/drivers/soc/mediatek/mtk-mmsys.h +++ b/drivers/soc/mediatek/mtk-mmsys.h @@ -78,6 +78,8 @@ #define DSI_SEL_IN_RDMA 0x1 #define DSI_SEL_IN_MASK 0x1 +#define MMSYS_SW0_RST_B 0x140 + struct mtk_mmsys_routes { u32 from_comp; u32 to_comp; |