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linux/drivers/phy/mediatek/phy-mtk-mipi-csi-0-5.c
Krzysztof Kozlowski 00ca8a15da phy: constify of_phandle_args in xlate 
The xlate callbacks are supposed to translate of_phandle_args to proper
provider without modifying the of_phandle_args.  Make the argument
pointer to const for code safety and readability.

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Acked-by: Thierry Reding <treding@nvidia.com>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Acked-by: Florian Fainelli <florian.fainelli@broadcom.com> #Broadcom
Link: https://lore.kernel.org/r/20240217093937.58234-1-krzysztof.kozlowski@linaro.org
Signed-off-by: Vinod Koul <vkoul@kernel.org>
2024-02-23 17:43:14 +05:30

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// SPDX-License-Identifier: GPL-2.0
/*
* MediaTek MIPI CSI v0.5 driver
*
* Copyright (c) 2023, MediaTek Inc.
* Copyright (c) 2023, BayLibre Inc.
*/
#include <dt-bindings/phy/phy.h>
#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_cdphy_port {
struct device *dev;
void __iomem *base;
struct phy *phy;
u32 type;
u32 mode;
u32 num_lanes;
};
enum PHY_TYPE {
DPHY = 0,
CPHY,
CDPHY,
};
static void mtk_phy_csi_cdphy_ana_eq_tune(void __iomem *base)
{
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);
}
static void mtk_phy_csi_dphy_ana_eq_tune(void __iomem *base)
{
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);
}
static int mtk_mipi_phy_power_on(struct phy *phy)
{
struct mtk_mipi_cdphy_port *port = phy_get_drvdata(phy);
void __iomem *base = port->base;
/*
* The driver currently supports DPHY and CD-PHY phys,
* but the only mode supported is DPHY,
* so CD-PHY capable phys must be configured in DPHY mode
*/
if (port->type == 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->type == CDPHY)
mtk_phy_csi_cdphy_ana_eq_tune(base);
else
mtk_phy_csi_dphy_ana_eq_tune(base);
/* 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_cdphy_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 struct phy *mtk_mipi_cdphy_xlate(struct device *dev,
const struct of_phandle_args *args)
{
struct mtk_mipi_cdphy_port *priv = dev_get_drvdata(dev);
/*
* If PHY is CD-PHY then we need to get the operating mode
* For now only D-PHY mode is supported
*/
if (priv->type == CDPHY) {
if (args->args_count != 1) {
dev_err(dev, "invalid number of arguments\n");
return ERR_PTR(-EINVAL);
}
switch (args->args[0]) {
case PHY_TYPE_DPHY:
priv->mode = DPHY;
if (priv->num_lanes != 4) {
dev_err(dev, "Only 4D1C mode is supported for now!\n");
return ERR_PTR(-EINVAL);
}
break;
default:
dev_err(dev, "Unsupported PHY type: %i\n", args->args[0]);
return ERR_PTR(-EINVAL);
}
} else {
if (args->args_count) {
dev_err(dev, "invalid number of arguments\n");
return ERR_PTR(-EINVAL);
}
priv->mode = DPHY;
}
return priv->phy;
}
static const struct phy_ops mtk_cdphy_ops = {
.power_on = mtk_mipi_phy_power_on,
.power_off = mtk_mipi_phy_power_off,
.owner = THIS_MODULE,
};
static int mtk_mipi_cdphy_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct phy_provider *phy_provider;
struct mtk_mipi_cdphy_port *port;
struct phy *phy;
int ret;
u32 phy_type;
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);
ret = of_property_read_u32(dev->of_node, "num-lanes", &port->num_lanes);
if (ret) {
dev_err(dev, "Failed to read num-lanes property: %i\n", ret);
return ret;
}
/*
* phy-type is optional, if not present, PHY is considered to be CD-PHY
*/
if (device_property_present(dev, "phy-type")) {
ret = of_property_read_u32(dev->of_node, "phy-type", &phy_type);
if (ret) {
dev_err(dev, "Failed to read phy-type property: %i\n", ret);
return ret;
}
switch (phy_type) {
case PHY_TYPE_DPHY:
port->type = DPHY;
break;
default:
dev_err(dev, "Unsupported PHY type: %i\n", phy_type);
return -EINVAL;
}
} else {
port->type = CDPHY;
}
phy = devm_phy_create(dev, NULL, &mtk_cdphy_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, mtk_mipi_cdphy_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_cdphy_of_match[] = {
{ .compatible = "mediatek,mt8365-csi-rx" },
{ /* sentinel */},
};
MODULE_DEVICE_TABLE(of, mtk_mipi_cdphy_of_match);
static struct platform_driver mipi_cdphy_pdrv = {
.probe = mtk_mipi_cdphy_probe,
.driver = {
.name = "mtk-mipi-csi-0-5",
.of_match_table = mtk_mipi_cdphy_of_match,
},
};
module_platform_driver(mipi_cdphy_pdrv);
MODULE_DESCRIPTION("MediaTek MIPI CSI CD-PHY v0.5 Driver");
MODULE_AUTHOR("Louis Kuo <louis.kuo@mediatek.com>");
MODULE_LICENSE("GPL");
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