diff options
Diffstat (limited to 'drivers/phy/mediatek/phy-mtk-mipi-dsi.c')
| -rw-r--r-- | drivers/phy/mediatek/phy-mtk-mipi-dsi.c | 248 |
1 files changed, 248 insertions, 0 deletions
diff --git a/drivers/phy/mediatek/phy-mtk-mipi-dsi.c b/drivers/phy/mediatek/phy-mtk-mipi-dsi.c new file mode 100644 index 000000000000..18c481251f04 --- /dev/null +++ b/drivers/phy/mediatek/phy-mtk-mipi-dsi.c @@ -0,0 +1,248 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Copyright (c) 2015 MediaTek Inc. + */ + +#include "phy-mtk-mipi-dsi.h" + +inline struct mtk_mipi_tx *mtk_mipi_tx_from_clk_hw(struct clk_hw *hw) +{ + return container_of(hw, struct mtk_mipi_tx, pll_hw); +} + +void mtk_mipi_tx_clear_bits(struct mtk_mipi_tx *mipi_tx, u32 offset, + u32 bits) +{ + u32 temp = readl(mipi_tx->regs + offset); + + writel(temp & ~bits, mipi_tx->regs + offset); +} + +void mtk_mipi_tx_set_bits(struct mtk_mipi_tx *mipi_tx, u32 offset, + u32 bits) +{ + u32 temp = readl(mipi_tx->regs + offset); + + writel(temp | bits, mipi_tx->regs + offset); +} + +void mtk_mipi_tx_update_bits(struct mtk_mipi_tx *mipi_tx, u32 offset, + u32 mask, u32 data) +{ + u32 temp = readl(mipi_tx->regs + offset); + + writel((temp & ~mask) | (data & mask), mipi_tx->regs + offset); +} + +int mtk_mipi_tx_pll_set_rate(struct clk_hw *hw, unsigned long rate, + unsigned long parent_rate) +{ + struct mtk_mipi_tx *mipi_tx = mtk_mipi_tx_from_clk_hw(hw); + + dev_dbg(mipi_tx->dev, "set rate: %lu Hz\n", rate); + + mipi_tx->data_rate = rate; + + return 0; +} + +unsigned long mtk_mipi_tx_pll_recalc_rate(struct clk_hw *hw, + unsigned long parent_rate) +{ + struct mtk_mipi_tx *mipi_tx = mtk_mipi_tx_from_clk_hw(hw); + + return mipi_tx->data_rate; +} + +static int mtk_mipi_tx_power_on(struct phy *phy) +{ + struct mtk_mipi_tx *mipi_tx = phy_get_drvdata(phy); + int ret; + + /* Power up core and enable PLL */ + ret = clk_prepare_enable(mipi_tx->pll); + if (ret < 0) + return ret; + + /* Enable DSI Lane LDO outputs, disable pad tie low */ + mipi_tx->driver_data->mipi_tx_enable_signal(phy); + return 0; +} + +static int mtk_mipi_tx_power_off(struct phy *phy) +{ + struct mtk_mipi_tx *mipi_tx = phy_get_drvdata(phy); + + /* Enable pad tie low, disable DSI Lane LDO outputs */ + mipi_tx->driver_data->mipi_tx_disable_signal(phy); + + /* Disable PLL and power down core */ + clk_disable_unprepare(mipi_tx->pll); + + return 0; +} + +static const struct phy_ops mtk_mipi_tx_ops = { + .power_on = mtk_mipi_tx_power_on, + .power_off = mtk_mipi_tx_power_off, + .owner = THIS_MODULE, +}; + +static void mtk_mipi_tx_get_calibration_datal(struct mtk_mipi_tx *mipi_tx) +{ + struct nvmem_cell *cell; + size_t len; + u32 *buf; + + cell = nvmem_cell_get(mipi_tx->dev, "calibration-data"); + if (IS_ERR(cell)) { + dev_info(mipi_tx->dev, "can't get nvmem_cell_get, ignore it\n"); + return; + } + buf = (u32 *)nvmem_cell_read(cell, &len); + nvmem_cell_put(cell); + + if (IS_ERR(buf)) { + dev_info(mipi_tx->dev, "can't get data, ignore it\n"); + return; + } + + if (len < 3 * sizeof(u32)) { + dev_info(mipi_tx->dev, "invalid calibration data\n"); + kfree(buf); + return; + } + + mipi_tx->rt_code[0] = ((buf[0] >> 6 & 0x1f) << 5) | + (buf[0] >> 11 & 0x1f); + mipi_tx->rt_code[1] = ((buf[1] >> 27 & 0x1f) << 5) | + (buf[0] >> 1 & 0x1f); + mipi_tx->rt_code[2] = ((buf[1] >> 17 & 0x1f) << 5) | + (buf[1] >> 22 & 0x1f); + mipi_tx->rt_code[3] = ((buf[1] >> 7 & 0x1f) << 5) | + (buf[1] >> 12 & 0x1f); + mipi_tx->rt_code[4] = ((buf[2] >> 27 & 0x1f) << 5) | + (buf[1] >> 2 & 0x1f); + kfree(buf); +} + +static int mtk_mipi_tx_probe(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + struct mtk_mipi_tx *mipi_tx; + struct resource *mem; + const char *ref_clk_name; + struct clk *ref_clk; + struct clk_init_data clk_init = { + .num_parents = 1, + .parent_names = (const char * const *)&ref_clk_name, + .flags = CLK_SET_RATE_GATE, + }; + struct phy *phy; + struct phy_provider *phy_provider; + int ret; + + mipi_tx = devm_kzalloc(dev, sizeof(*mipi_tx), GFP_KERNEL); + if (!mipi_tx) + return -ENOMEM; + + mipi_tx->driver_data = of_device_get_match_data(dev); + + mem = platform_get_resource(pdev, IORESOURCE_MEM, 0); + mipi_tx->regs = devm_ioremap_resource(dev, mem); + if (IS_ERR(mipi_tx->regs)) { + ret = PTR_ERR(mipi_tx->regs); + dev_err(dev, "Failed to get memory resource: %d\n", ret); + return ret; + } + + ref_clk = devm_clk_get(dev, NULL); + if (IS_ERR(ref_clk)) { + ret = PTR_ERR(ref_clk); + dev_err(dev, "Failed to get reference clock: %d\n", ret); + return ret; + } + + ret = of_property_read_u32(dev->of_node, "drive-strength-microamp", + &mipi_tx->mipitx_drive); + /* If can't get the "mipi_tx->mipitx_drive", set it default 0x8 */ + if (ret < 0) + mipi_tx->mipitx_drive = 4600; + + /* check the mipitx_drive valid */ + if (mipi_tx->mipitx_drive > 6000 || mipi_tx->mipitx_drive < 3000) { + dev_warn(dev, "drive-strength-microamp is invalid %d, not in 3000 ~ 6000\n", + mipi_tx->mipitx_drive); + mipi_tx->mipitx_drive = clamp_val(mipi_tx->mipitx_drive, 3000, + 6000); + } + + ref_clk_name = __clk_get_name(ref_clk); + + ret = of_property_read_string(dev->of_node, "clock-output-names", + &clk_init.name); + if (ret < 0) { + dev_err(dev, "Failed to read clock-output-names: %d\n", ret); + return ret; + } + + clk_init.ops = mipi_tx->driver_data->mipi_tx_clk_ops; + + mipi_tx->pll_hw.init = &clk_init; + mipi_tx->pll = devm_clk_register(dev, &mipi_tx->pll_hw); + if (IS_ERR(mipi_tx->pll)) { + ret = PTR_ERR(mipi_tx->pll); + dev_err(dev, "Failed to register PLL: %d\n", ret); + return ret; + } + + phy = devm_phy_create(dev, NULL, &mtk_mipi_tx_ops); + if (IS_ERR(phy)) { + ret = PTR_ERR(phy); + dev_err(dev, "Failed to create MIPI D-PHY: %d\n", ret); + return ret; + } + phy_set_drvdata(phy, mipi_tx); + + phy_provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate); + if (IS_ERR(phy_provider)) { + ret = PTR_ERR(phy_provider); + return ret; + } + + mipi_tx->dev = dev; + + mtk_mipi_tx_get_calibration_datal(mipi_tx); + + return of_clk_add_provider(dev->of_node, of_clk_src_simple_get, + mipi_tx->pll); +} + +static int mtk_mipi_tx_remove(struct platform_device *pdev) +{ + of_clk_del_provider(pdev->dev.of_node); + return 0; +} + +static const struct of_device_id mtk_mipi_tx_match[] = { + { .compatible = "mediatek,mt2701-mipi-tx", + .data = &mt2701_mipitx_data }, + { .compatible = "mediatek,mt8173-mipi-tx", + .data = &mt8173_mipitx_data }, + { .compatible = "mediatek,mt8183-mipi-tx", + .data = &mt8183_mipitx_data }, + { }, +}; + +struct platform_driver mtk_mipi_tx_driver = { + .probe = mtk_mipi_tx_probe, + .remove = mtk_mipi_tx_remove, + .driver = { + .name = "mediatek-mipi-tx", + .of_match_table = mtk_mipi_tx_match, + }, +}; +module_platform_driver(mtk_mipi_tx_driver); + +MODULE_DESCRIPTION("MediaTek MIPI TX Driver"); +MODULE_LICENSE("GPL v2"); |