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Message-Id: <20230515090551.1251389-3-jstephan@baylibre.com>
Date: Mon, 15 May 2023 11:05:51 +0200
From: Julien Stephan <jstephan@...libre.com>
To: unlisted-recipients:; (no To-header on input)
Cc: krzysztof.kozlowski@...aro.org, robh@...nel.org,
chunkuang.hu@...nel.org, linux-mediatek@...ts.infradead.org,
Phi-bang Nguyen <pnguyen@...libre.com>,
Louis Kuo <louis.kuo@...iatek.com>,
Julien Stephan <jstephan@...libre.com>,
Chunfeng Yun <chunfeng.yun@...iatek.com>,
Vinod Koul <vkoul@...nel.org>,
Kishon Vijay Abraham I <kishon@...nel.org>,
Andy Hsieh <andy.hsieh@...iatek.com>,
Philipp Zabel <p.zabel@...gutronix.de>,
Matthias Brugger <matthias.bgg@...il.com>,
AngeloGioacchino Del Regno
<angelogioacchino.delregno@...labora.com>,
linux-kernel@...r.kernel.org (open list),
linux-arm-kernel@...ts.infradead.org (moderated list:ARM/Mediatek USB3
PHY DRIVER),
linux-phy@...ts.infradead.org (open list:GENERIC PHY FRAMEWORK),
dri-devel@...ts.freedesktop.org (open list:DRM DRIVERS FOR MEDIATEK)
Subject: [PATCH v2 2/2] phy: mtk-mipi-csi: add driver for CSI phy
From: Phi-bang Nguyen <pnguyen@...libre.com>
This is a new driver that supports the MIPI CSI CD-PHY version 0.5
The number of PHYs depend on the soc.
Signed-off-by: Louis Kuo <louis.kuo@...iatek.com>
Signed-off-by: Phi-bang Nguyen <pnguyen@...libre.com>
[Julien Stephan: use GENMASK]
[Julien Stephan: refactor code]
[Julien Stephan: update device tree support and probe function]
Co-developed-by: Julien Stephan <jstephan@...libre.com>
Signed-off-by: Julien Stephan <jstephan@...libre.com>
---
MAINTAINERS | 1 +
drivers/phy/mediatek/Kconfig | 8 +
drivers/phy/mediatek/Makefile | 2 +
.../mediatek/phy-mtk-mipi-csi-0-5-rx-reg.h | 58 ++++
drivers/phy/mediatek/phy-mtk-mipi-csi-0-5.c | 257 ++++++++++++++++++
5 files changed, 326 insertions(+)
create mode 100644 drivers/phy/mediatek/phy-mtk-mipi-csi-0-5-rx-reg.h
create mode 100644 drivers/phy/mediatek/phy-mtk-mipi-csi-0-5.c
diff --git a/MAINTAINERS b/MAINTAINERS
index 44f0ff11e984..fc2766cb50d3 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -13103,6 +13103,7 @@ M: Julien Stephan <jstephan@...libre.com>
M: Andy Hsieh <andy.hsieh@...iatek.com>
S: Supported
F: Documentation/devicetree/bindings/phy/mediatek,phy-mipi-csi-0-5.yaml
+F: drivers/phy/mediatek/phy-mtk-mipi-csi-0-5*
MEDIATEK MMC/SD/SDIO DRIVER
M: Chaotian Jing <chaotian.jing@...iatek.com>
diff --git a/drivers/phy/mediatek/Kconfig b/drivers/phy/mediatek/Kconfig
index 3125ecb5d119..452bc7ac5ce5 100644
--- a/drivers/phy/mediatek/Kconfig
+++ b/drivers/phy/mediatek/Kconfig
@@ -74,3 +74,11 @@ config PHY_MTK_DP
select GENERIC_PHY
help
Support DisplayPort PHY for MediaTek SoCs.
+
+config PHY_MTK_MIPI_CSI_0_5
+ tristate "MediaTek CSI CD-PHY v 0.5 Driver"
+ depends on ARCH_MEDIATEK && OF
+ select GENERIC_PHY
+ help
+ Enable this to support the MIPI CSI CD-PHY receiver version 0.5.
+ The driver supports multiple CSI cdphy ports simultaneously.
diff --git a/drivers/phy/mediatek/Makefile b/drivers/phy/mediatek/Makefile
index fb1f8edaffa7..8eb7b8747c67 100644
--- a/drivers/phy/mediatek/Makefile
+++ b/drivers/phy/mediatek/Makefile
@@ -18,3 +18,5 @@ phy-mtk-mipi-dsi-drv-y := phy-mtk-mipi-dsi.o
phy-mtk-mipi-dsi-drv-y += phy-mtk-mipi-dsi-mt8173.o
phy-mtk-mipi-dsi-drv-y += phy-mtk-mipi-dsi-mt8183.o
obj-$(CONFIG_PHY_MTK_MIPI_DSI) += phy-mtk-mipi-dsi-drv.o
+
+obj-$(CONFIG_PHY_MTK_MIPI_CSI_0_5) += phy-mtk-mipi-csi-0-5.o
diff --git a/drivers/phy/mediatek/phy-mtk-mipi-csi-0-5-rx-reg.h b/drivers/phy/mediatek/phy-mtk-mipi-csi-0-5-rx-reg.h
new file mode 100644
index 000000000000..e9a7f1ab3e2f
--- /dev/null
+++ b/drivers/phy/mediatek/phy-mtk-mipi-csi-0-5-rx-reg.h
@@ -0,0 +1,58 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+
+#ifndef __PHY_MTK__MIPI_CSI__C_0_5_RX_REG_H__
+#define __PHY_MTK__MIPI_CSI__C_0_5_RX_REG_H__
+
+/*
+ * CSI1 and CSI2 are identical, and similar to CSI0. All CSIx macros are
+ * applicable to the three PHYs. Where differences exist, they are denoted by
+ * macro names using CSI0 and CSI1, the latter being applicable to CSI1 and
+ * CSI2 alike.
+ */
+
+#define MIPI_RX_ANA00_CSIxA 0x0000
+#define RG_CSI0A_CPHY_EN BIT(0)
+#define RG_CSIxA_EQ_PROTECT_EN BIT(1)
+#define RG_CSIxA_BG_LPF_EN BIT(2)
+#define RG_CSIxA_BG_CORE_EN BIT(3)
+#define RG_CSIxA_DPHY_L0_CKMODE_EN BIT(5)
+#define RG_CSIxA_DPHY_L0_CKSEL BIT(6)
+#define RG_CSIxA_DPHY_L1_CKMODE_EN BIT(8)
+#define RG_CSIxA_DPHY_L1_CKSEL BIT(9)
+#define RG_CSIxA_DPHY_L2_CKMODE_EN BIT(11)
+#define RG_CSIxA_DPHY_L2_CKSEL BIT(12)
+
+#define MIPI_RX_ANA18_CSIxA 0x0018
+#define RG_CSI0A_L0_T0AB_EQ_IS GENMASK(5, 4)
+#define RG_CSI0A_L0_T0AB_EQ_BW GENMASK(7, 6)
+#define RG_CSI0A_L1_T1AB_EQ_IS GENMASK(21, 20)
+#define RG_CSI0A_L1_T1AB_EQ_BW GENMASK(23, 22)
+#define RG_CSI0A_L2_T1BC_EQ_IS GENMASK(21, 20)
+#define RG_CSI0A_L2_T1BC_EQ_BW GENMASK(23, 22)
+#define RG_CSI1A_L0_EQ_IS GENMASK(5, 4)
+#define RG_CSI1A_L0_EQ_BW GENMASK(7, 6)
+#define RG_CSI1A_L1_EQ_IS GENMASK(21, 20)
+#define RG_CSI1A_L1_EQ_BW GENMASK(23, 22)
+#define RG_CSI1A_L2_EQ_IS GENMASK(5, 4)
+#define RG_CSI1A_L2_EQ_BW GENMASK(7, 6)
+
+#define MIPI_RX_ANA1C_CSIxA 0x001c
+#define MIPI_RX_ANA20_CSI0A 0x0020
+
+#define MIPI_RX_ANA24_CSIxA 0x0024
+#define RG_CSIxA_RESERVE GENMASK(31, 24)
+
+#define MIPI_RX_ANA40_CSIxA 0x0040
+#define RG_CSIxA_CPHY_FMCK_SEL GENMASK(1, 0)
+#define RG_CSIxA_ASYNC_OPTION GENMASK(7, 4)
+#define RG_CSIxA_CPHY_SPARE GENMASK(31, 16)
+
+#define MIPI_RX_WRAPPER80_CSIxA 0x0080
+#define CSR_CSI_RST_MODE GENMASK(17, 16)
+
+#define MIPI_RX_ANAA8_CSIxA 0x00a8
+#define RG_CSIxA_CDPHY_L0_T0_BYTECK_INVERT BIT(0)
+#define RG_CSIxA_DPHY_L1_BYTECK_INVERT BIT(1)
+#define RG_CSIxA_CDPHY_L2_T1_BYTECK_INVERT BIT(2)
+
+#endif
diff --git a/drivers/phy/mediatek/phy-mtk-mipi-csi-0-5.c b/drivers/phy/mediatek/phy-mtk-mipi-csi-0-5.c
new file mode 100644
index 000000000000..ae2d3dc9631d
--- /dev/null
+++ b/drivers/phy/mediatek/phy-mtk-mipi-csi-0-5.c
@@ -0,0 +1,257 @@
+// SPDX-License-Identifier: GPL-2.0
+
+#include <linux/bitfield.h>
+#include <linux/delay.h>
+#include <linux/io.h>
+#include <linux/module.h>
+#include <linux/mutex.h>
+#include <linux/phy/phy.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+
+#include "phy-mtk-io.h"
+#include "phy-mtk-mipi-csi-0-5-rx-reg.h"
+
+#define CSIxB_OFFSET 0x1000
+
+struct mtk_mipi_dphy;
+
+struct mtk_mipi_dphy_port {
+ struct device *dev;
+ void __iomem *base;
+ struct phy *phy;
+ bool is_cdphy;
+};
+
+static int mtk_mipi_phy_power_on(struct phy *phy)
+{
+ struct mtk_mipi_dphy_port *port = phy_get_drvdata(phy);
+ void __iomem *base = port->base;
+
+ /*
+ * Only DPHY is supported for now,
+ * so set analog phy mode to DPHY in CDPHY compatible PHYs
+ */
+ if (port->is_cdphy) {
+ mtk_phy_update_field(base + MIPI_RX_ANA00_CSIxA,
+ RG_CSI0A_CPHY_EN, 0);
+ mtk_phy_update_field(base + CSIxB_OFFSET + MIPI_RX_ANA00_CSIxA,
+ RG_CSI0A_CPHY_EN, 0);
+ }
+
+ /*
+ * Lane configuration:
+ *
+ * Only 4 data + 1 clock is supported for now with the following mapping:
+ *
+ * CSIxA_LNR0 --> D2
+ * CSIxA_LNR1 --> D0
+ * CSIxA_LNR2 --> C
+ * CSIxB_LNR0 --> D1
+ * CSIxB_LNR1 --> D3
+ */
+ mtk_phy_update_field(base + MIPI_RX_ANA00_CSIxA,
+ RG_CSIxA_DPHY_L0_CKMODE_EN, 0);
+ mtk_phy_update_field(base + MIPI_RX_ANA00_CSIxA,
+ RG_CSIxA_DPHY_L0_CKSEL, 1);
+ mtk_phy_update_field(base + MIPI_RX_ANA00_CSIxA,
+ RG_CSIxA_DPHY_L1_CKMODE_EN, 0);
+ mtk_phy_update_field(base + MIPI_RX_ANA00_CSIxA,
+ RG_CSIxA_DPHY_L1_CKSEL, 1);
+ mtk_phy_update_field(base + MIPI_RX_ANA00_CSIxA,
+ RG_CSIxA_DPHY_L2_CKMODE_EN, 1);
+ mtk_phy_update_field(base + MIPI_RX_ANA00_CSIxA,
+ RG_CSIxA_DPHY_L2_CKSEL, 1);
+
+ mtk_phy_update_field(base + CSIxB_OFFSET + MIPI_RX_ANA00_CSIxA,
+ RG_CSIxA_DPHY_L0_CKMODE_EN, 0);
+ mtk_phy_update_field(base + CSIxB_OFFSET + MIPI_RX_ANA00_CSIxA,
+ RG_CSIxA_DPHY_L0_CKSEL, 1);
+ mtk_phy_update_field(base + CSIxB_OFFSET + MIPI_RX_ANA00_CSIxA,
+ RG_CSIxA_DPHY_L1_CKMODE_EN, 0);
+ mtk_phy_update_field(base + CSIxB_OFFSET + MIPI_RX_ANA00_CSIxA,
+ RG_CSIxA_DPHY_L1_CKSEL, 1);
+ mtk_phy_update_field(base + CSIxB_OFFSET + MIPI_RX_ANA00_CSIxA,
+ RG_CSIxA_DPHY_L2_CKMODE_EN, 0);
+ mtk_phy_update_field(base + CSIxB_OFFSET + MIPI_RX_ANA00_CSIxA,
+ RG_CSIxA_DPHY_L2_CKSEL, 1);
+
+ /* Byte clock invert */
+ mtk_phy_update_field(base + MIPI_RX_ANAA8_CSIxA,
+ RG_CSIxA_CDPHY_L0_T0_BYTECK_INVERT, 1);
+ mtk_phy_update_field(base + MIPI_RX_ANAA8_CSIxA,
+ RG_CSIxA_DPHY_L1_BYTECK_INVERT, 1);
+ mtk_phy_update_field(base + MIPI_RX_ANAA8_CSIxA,
+ RG_CSIxA_CDPHY_L2_T1_BYTECK_INVERT, 1);
+
+ mtk_phy_update_field(base + CSIxB_OFFSET + MIPI_RX_ANAA8_CSIxA,
+ RG_CSIxA_CDPHY_L0_T0_BYTECK_INVERT, 1);
+ mtk_phy_update_field(base + CSIxB_OFFSET + MIPI_RX_ANAA8_CSIxA,
+ RG_CSIxA_DPHY_L1_BYTECK_INVERT, 1);
+ mtk_phy_update_field(base + CSIxB_OFFSET + MIPI_RX_ANAA8_CSIxA,
+ RG_CSIxA_CDPHY_L2_T1_BYTECK_INVERT, 1);
+
+ /* Start ANA EQ tuning */
+ if (port->is_cdphy) {
+ mtk_phy_update_field(base + MIPI_RX_ANA18_CSIxA,
+ RG_CSI0A_L0_T0AB_EQ_IS, 1);
+ mtk_phy_update_field(base + MIPI_RX_ANA18_CSIxA,
+ RG_CSI0A_L0_T0AB_EQ_BW, 1);
+ mtk_phy_update_field(base + MIPI_RX_ANA1C_CSIxA,
+ RG_CSI0A_L1_T1AB_EQ_IS, 1);
+ mtk_phy_update_field(base + MIPI_RX_ANA1C_CSIxA,
+ RG_CSI0A_L1_T1AB_EQ_BW, 1);
+ mtk_phy_update_field(base + MIPI_RX_ANA20_CSI0A,
+ RG_CSI0A_L2_T1BC_EQ_IS, 1);
+ mtk_phy_update_field(base + MIPI_RX_ANA20_CSI0A,
+ RG_CSI0A_L2_T1BC_EQ_BW, 1);
+
+ mtk_phy_update_field(base + CSIxB_OFFSET + MIPI_RX_ANA18_CSIxA,
+ RG_CSI0A_L0_T0AB_EQ_IS, 1);
+ mtk_phy_update_field(base + CSIxB_OFFSET + MIPI_RX_ANA18_CSIxA,
+ RG_CSI0A_L0_T0AB_EQ_BW, 1);
+ mtk_phy_update_field(base + CSIxB_OFFSET + MIPI_RX_ANA1C_CSIxA,
+ RG_CSI0A_L1_T1AB_EQ_IS, 1);
+ mtk_phy_update_field(base + CSIxB_OFFSET + MIPI_RX_ANA1C_CSIxA,
+ RG_CSI0A_L1_T1AB_EQ_BW, 1);
+ mtk_phy_update_field(base + CSIxB_OFFSET + MIPI_RX_ANA20_CSI0A,
+ RG_CSI0A_L2_T1BC_EQ_IS, 1);
+ mtk_phy_update_field(base + CSIxB_OFFSET + MIPI_RX_ANA20_CSI0A,
+ RG_CSI0A_L2_T1BC_EQ_BW, 1);
+ } else {
+ mtk_phy_update_field(base + MIPI_RX_ANA18_CSIxA,
+ RG_CSI1A_L0_EQ_IS, 1);
+ mtk_phy_update_field(base + MIPI_RX_ANA18_CSIxA,
+ RG_CSI1A_L0_EQ_BW, 1);
+ mtk_phy_update_field(base + MIPI_RX_ANA18_CSIxA,
+ RG_CSI1A_L1_EQ_IS, 1);
+ mtk_phy_update_field(base + MIPI_RX_ANA18_CSIxA,
+ RG_CSI1A_L1_EQ_BW, 1);
+ mtk_phy_update_field(base + MIPI_RX_ANA1C_CSIxA,
+ RG_CSI1A_L2_EQ_IS, 1);
+ mtk_phy_update_field(base + MIPI_RX_ANA1C_CSIxA,
+ RG_CSI1A_L2_EQ_BW, 1);
+
+ mtk_phy_update_field(base + CSIxB_OFFSET + MIPI_RX_ANA18_CSIxA,
+ RG_CSI1A_L0_EQ_IS, 1);
+ mtk_phy_update_field(base + CSIxB_OFFSET + MIPI_RX_ANA18_CSIxA,
+ RG_CSI1A_L0_EQ_BW, 1);
+ mtk_phy_update_field(base + CSIxB_OFFSET + MIPI_RX_ANA18_CSIxA,
+ RG_CSI1A_L1_EQ_IS, 1);
+ mtk_phy_update_field(base + CSIxB_OFFSET + MIPI_RX_ANA18_CSIxA,
+ RG_CSI1A_L1_EQ_BW, 1);
+ mtk_phy_update_field(base + CSIxB_OFFSET + MIPI_RX_ANA1C_CSIxA,
+ RG_CSI1A_L2_EQ_IS, 1);
+ mtk_phy_update_field(base + CSIxB_OFFSET + MIPI_RX_ANA1C_CSIxA,
+ RG_CSI1A_L2_EQ_BW, 1);
+ }
+
+ /* End ANA EQ tuning */
+ mtk_phy_set_bits(base + MIPI_RX_ANA40_CSIxA, 0x90);
+
+ mtk_phy_update_field(base + MIPI_RX_ANA24_CSIxA,
+ RG_CSIxA_RESERVE, 0x40);
+ mtk_phy_update_field(base + CSIxB_OFFSET + MIPI_RX_ANA24_CSIxA,
+ RG_CSIxA_RESERVE, 0x40);
+ mtk_phy_update_field(base + MIPI_RX_WRAPPER80_CSIxA,
+ CSR_CSI_RST_MODE, 0);
+ mtk_phy_update_field(base + CSIxB_OFFSET + MIPI_RX_WRAPPER80_CSIxA,
+ CSR_CSI_RST_MODE, 0);
+ /* ANA power on */
+ mtk_phy_update_field(base + MIPI_RX_ANA00_CSIxA,
+ RG_CSIxA_BG_CORE_EN, 1);
+ mtk_phy_update_field(base + CSIxB_OFFSET + MIPI_RX_ANA00_CSIxA,
+ RG_CSIxA_BG_CORE_EN, 1);
+ usleep_range(20, 40);
+ mtk_phy_update_field(base + MIPI_RX_ANA00_CSIxA,
+ RG_CSIxA_BG_LPF_EN, 1);
+ mtk_phy_update_field(base + CSIxB_OFFSET + MIPI_RX_ANA00_CSIxA,
+ RG_CSIxA_BG_LPF_EN, 1);
+
+ return 0;
+}
+
+static int mtk_mipi_phy_power_off(struct phy *phy)
+{
+ struct mtk_mipi_dphy_port *port = phy_get_drvdata(phy);
+ void __iomem *base = port->base;
+
+ /* Disable MIPI BG. */
+ mtk_phy_update_field(base + MIPI_RX_ANA00_CSIxA,
+ RG_CSIxA_BG_CORE_EN, 0);
+ mtk_phy_update_field(base + MIPI_RX_ANA00_CSIxA,
+ RG_CSIxA_BG_LPF_EN, 0);
+
+ mtk_phy_update_field(base + CSIxB_OFFSET + MIPI_RX_ANA00_CSIxA,
+ RG_CSIxA_BG_CORE_EN, 0);
+ mtk_phy_update_field(base + CSIxB_OFFSET + MIPI_RX_ANA00_CSIxA,
+ RG_CSIxA_BG_LPF_EN, 0);
+
+ return 0;
+}
+
+static const struct phy_ops mtk_dphy_ops = {
+ .power_on = mtk_mipi_phy_power_on,
+ .power_off = mtk_mipi_phy_power_off,
+ .owner = THIS_MODULE,
+};
+
+static int mtk_mipi_dphy_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct phy_provider *phy_provider;
+ struct mtk_mipi_dphy_port *port;
+ struct phy *phy;
+
+ port = devm_kzalloc(dev, sizeof(*port), GFP_KERNEL);
+ if (!port)
+ return -ENOMEM;
+
+ dev_set_drvdata(dev, port);
+
+ port->dev = dev;
+
+ port->base = devm_platform_ioremap_resource(pdev, 0);
+ if (IS_ERR(port->base))
+ return PTR_ERR(port->base);
+
+ port->is_cdphy = of_property_read_bool(dev->of_node, "mediatek,is_cdphy");
+
+ phy = devm_phy_create(dev, NULL, &mtk_dphy_ops);
+ if (IS_ERR(phy)) {
+ dev_err(dev, "Failed to create PHY: %ld\n", PTR_ERR(phy));
+ return PTR_ERR(phy);
+ }
+
+ port->phy = phy;
+ phy_set_drvdata(phy, port);
+
+ phy_provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate);
+ if (IS_ERR(phy_provider)) {
+ dev_err(dev, "Failed to register PHY provider: %ld\n",
+ PTR_ERR(phy_provider));
+ return PTR_ERR(phy_provider);
+ }
+
+ return 0;
+}
+
+static const struct of_device_id mtk_mipi_dphy_of_match[] = {
+ {.compatible = "mediatek,phy-mipi-csi-0-5"},
+ {},
+};
+MODULE_DEVICE_TABLE(of, mtk_mipi_dphy_of_match);
+
+static struct platform_driver mipi_dphy_pdrv = {
+ .probe = mtk_mipi_dphy_probe,
+ .driver = {
+ .name = "mtk-mipi-csi-0-5",
+ .of_match_table = mtk_mipi_dphy_of_match,
+ },
+};
+
+module_platform_driver(mipi_dphy_pdrv);
+
+MODULE_DESCRIPTION("MTK mipi csi cdphy driver");
+MODULE_AUTHOR("Louis Kuo <louis.kuo@...iatek.com>");
+MODULE_LICENSE("GPL");
--
2.40.0
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