1 // SPDX-License-Identifier: GPL-2.0-only
5  * Copyright (C) 2016 Shawn Lin <shawn.lin@rock-chips.com>
20  * The higher 16-bit of this register is used for write protection
106 	regmap_write(rk_phy->reg_base,  in rockchip_emmc_phy_power()
107 		     rk_phy->reg_offset + GRF_EMMCPHY_CON6,  in rockchip_emmc_phy_power()
111 	regmap_write(rk_phy->reg_base,  in rockchip_emmc_phy_power()
112 		     rk_phy->reg_offset + GRF_EMMCPHY_CON6,  in rockchip_emmc_phy_power()
121 	rate = clk_get_rate(rk_phy->emmcclk);  in rockchip_emmc_phy_power()
146 			rate - ideal_rate : ideal_rate - rate;  in rockchip_emmc_phy_power()
155 			dev_warn(&phy->dev, "Unsupported rate: %lu\n", rate);  in rockchip_emmc_phy_power()
164 	regmap_write(rk_phy->reg_base,  in rockchip_emmc_phy_power()
165 		     rk_phy->reg_offset + GRF_EMMCPHY_CON6,  in rockchip_emmc_phy_power()
177 	ret = regmap_read_poll_timeout(rk_phy->reg_base,  in rockchip_emmc_phy_power()
178 				       rk_phy->reg_offset + GRF_EMMCPHY_STATUS,  in rockchip_emmc_phy_power()
187 	regmap_write(rk_phy->reg_base,  in rockchip_emmc_phy_power()
188 		     rk_phy->reg_offset + GRF_EMMCPHY_CON0,  in rockchip_emmc_phy_power()
193 	regmap_write(rk_phy->reg_base,  in rockchip_emmc_phy_power()
194 		     rk_phy->reg_offset + GRF_EMMCPHY_CON6,  in rockchip_emmc_phy_power()
225 	ret = regmap_read_poll_timeout(rk_phy->reg_base,  in rockchip_emmc_phy_power()
226 				       rk_phy->reg_offset + GRF_EMMCPHY_STATUS,  in rockchip_emmc_phy_power()
245 	 * - PHY driver to probe  in rockchip_emmc_phy_init()
246 	 * - SDHCI driver to start probe  in rockchip_emmc_phy_init()
247 	 * - SDHCI driver to register it's clock  in rockchip_emmc_phy_init()
248 	 * - SDHCI driver to get the PHY  in rockchip_emmc_phy_init()
249 	 * - SDHCI driver to init the PHY  in rockchip_emmc_phy_init()
258 	rk_phy->emmcclk = clk_get_optional(&phy->dev, "emmcclk");  in rockchip_emmc_phy_init()
259 	if (IS_ERR(rk_phy->emmcclk)) {  in rockchip_emmc_phy_init()
260 		ret = PTR_ERR(rk_phy->emmcclk);  in rockchip_emmc_phy_init()
261 		dev_err(&phy->dev, "Error getting emmcclk: %d\n", ret);  in rockchip_emmc_phy_init()
262 		rk_phy->emmcclk = NULL;  in rockchip_emmc_phy_init()
272 	clk_put(rk_phy->emmcclk);  in rockchip_emmc_phy_exit()
288 	regmap_write(rk_phy->reg_base,  in rockchip_emmc_phy_power_on()
289 		     rk_phy->reg_offset + GRF_EMMCPHY_CON6,  in rockchip_emmc_phy_power_on()
290 		     HIWORD_UPDATE(rk_phy->drive_impedance,  in rockchip_emmc_phy_power_on()
294 	/* Output tap delay: enable */  in rockchip_emmc_phy_power_on()
295 	regmap_write(rk_phy->reg_base,  in rockchip_emmc_phy_power_on()
296 		     rk_phy->reg_offset + GRF_EMMCPHY_CON0,  in rockchip_emmc_phy_power_on()
301 	/* Output tap delay */  in rockchip_emmc_phy_power_on()
302 	regmap_write(rk_phy->reg_base,  in rockchip_emmc_phy_power_on()
303 		     rk_phy->reg_offset + GRF_EMMCPHY_CON0,  in rockchip_emmc_phy_power_on()
304 		     HIWORD_UPDATE(rk_phy->output_tapdelay_select,  in rockchip_emmc_phy_power_on()
308 	/* Internal pull-down for strobe line */  in rockchip_emmc_phy_power_on()
309 	regmap_write(rk_phy->reg_base,  in rockchip_emmc_phy_power_on()
310 		     rk_phy->reg_offset + GRF_EMMCPHY_CON2,  in rockchip_emmc_phy_power_on()
311 		     HIWORD_UPDATE(rk_phy->enable_strobe_pulldown,  in rockchip_emmc_phy_power_on()
342 	dev_warn(&pdev->dev, "Invalid value %u for drive-impedance-ohm.\n",  in convert_drive_impedance_ohm()
349 	struct device *dev = &pdev->dev;  in rockchip_emmc_phy_probe()
357 	if (!dev->parent || !dev->parent->of_node)  in rockchip_emmc_phy_probe()
358 		return -ENODEV;  in rockchip_emmc_phy_probe()
360 	grf = syscon_node_to_regmap(dev->parent->of_node);  in rockchip_emmc_phy_probe()
368 		return -ENOMEM;  in rockchip_emmc_phy_probe()
370 	if (of_property_read_u32(dev->of_node, "reg", &reg_offset)) {  in rockchip_emmc_phy_probe()
372 			dev->of_node);  in rockchip_emmc_phy_probe()
373 		return -EINVAL;  in rockchip_emmc_phy_probe()
376 	rk_phy->reg_offset = reg_offset;  in rockchip_emmc_phy_probe()
377 	rk_phy->reg_base = grf;  in rockchip_emmc_phy_probe()
378 	rk_phy->drive_impedance = PHYCTRL_DR_50OHM;  in rockchip_emmc_phy_probe()
379 	rk_phy->enable_strobe_pulldown = PHYCTRL_REN_STRB_DISABLE;  in rockchip_emmc_phy_probe()
380 	rk_phy->output_tapdelay_select = PHYCTRL_OTAPDLYSEL_DEFAULT;  in rockchip_emmc_phy_probe()
382 	if (!of_property_read_u32(dev->of_node, "drive-impedance-ohm", &val))  in rockchip_emmc_phy_probe()
383 		rk_phy->drive_impedance = convert_drive_impedance_ohm(pdev, val);  in rockchip_emmc_phy_probe()
385 	if (of_property_read_bool(dev->of_node, "rockchip,enable-strobe-pulldown"))  in rockchip_emmc_phy_probe()
386 		rk_phy->enable_strobe_pulldown = PHYCTRL_REN_STRB_ENABLE;  in rockchip_emmc_phy_probe()
388 	if (!of_property_read_u32(dev->of_node, "rockchip,output-tapdelay-select", &val)) {  in rockchip_emmc_phy_probe()
390 			rk_phy->output_tapdelay_select = val;  in rockchip_emmc_phy_probe()
392 			dev_err(dev, "output-tapdelay-select exceeds limit, apply default\n");  in rockchip_emmc_phy_probe()
395 	generic_phy = devm_phy_create(dev, dev->of_node, &ops);  in rockchip_emmc_phy_probe()
408 	{ .compatible = "rockchip,rk3399-emmc-phy" },
417 		.name	= "rockchip-emmc-phy",
424 MODULE_AUTHOR("Shawn Lin <shawn.lin@rock-chips.com>");