1 // SPDX-License-Identifier: GPL-2.0-only
3  * Rockchip emmc PHY driver
5  * Copyright (C) 2016 Shawn Lin <shawn.lin@rock-chips.com>
15 #include <linux/phy/phy.h>
20  * The higher 16-bit of this register is used for write protection
85 static int rockchip_emmc_phy_power(struct phy *phy, bool on_off)  in rockchip_emmc_phy_power()  argument
87 	struct rockchip_emmc_phy *rk_phy = phy_get_drvdata(phy);  in rockchip_emmc_phy_power()
98 	regmap_write(rk_phy->reg_base,  in rockchip_emmc_phy_power()
99 		     rk_phy->reg_offset + GRF_EMMCPHY_CON6,  in rockchip_emmc_phy_power()
103 	regmap_write(rk_phy->reg_base,  in rockchip_emmc_phy_power()
104 		     rk_phy->reg_offset + GRF_EMMCPHY_CON6,  in rockchip_emmc_phy_power()
113 	rate = clk_get_rate(rk_phy->emmcclk);  in rockchip_emmc_phy_power()
138 			rate - ideal_rate : ideal_rate - rate;  in rockchip_emmc_phy_power()
143 		 * far off.  Also warn if we're above the 200 MHz max.  Don't  in rockchip_emmc_phy_power()
144 		 * warn for really slow rates since we won't be tuning then.  in rockchip_emmc_phy_power()
147 			dev_warn(&phy->dev, "Unsupported rate: %lu\n", rate);  in rockchip_emmc_phy_power()
156 	regmap_write(rk_phy->reg_base,  in rockchip_emmc_phy_power()
157 		     rk_phy->reg_offset + GRF_EMMCPHY_CON6,  in rockchip_emmc_phy_power()
169 	ret = regmap_read_poll_timeout(rk_phy->reg_base,  in rockchip_emmc_phy_power()
170 				       rk_phy->reg_offset + GRF_EMMCPHY_STATUS,  in rockchip_emmc_phy_power()
179 	regmap_write(rk_phy->reg_base,  in rockchip_emmc_phy_power()
180 		     rk_phy->reg_offset + GRF_EMMCPHY_CON0,  in rockchip_emmc_phy_power()
185 	regmap_write(rk_phy->reg_base,  in rockchip_emmc_phy_power()
186 		     rk_phy->reg_offset + GRF_EMMCPHY_CON6,  in rockchip_emmc_phy_power()
193 	 * clock might be turned on later.  ...but we can't wait for the DLL  in rockchip_emmc_phy_power()
198 	 * is turned on, but for now we won't.  in rockchip_emmc_phy_power()
206 	 * with clock speed.  If we are powering on the PHY and the card clock  in rockchip_emmc_phy_power()
209 	 * Hopefully we won't be running at 100 kHz, but we should still make  in rockchip_emmc_phy_power()
213 	 * extra long to lock for reasons that aren't understood.  In some  in rockchip_emmc_phy_power()
217 	ret = regmap_read_poll_timeout(rk_phy->reg_base,  in rockchip_emmc_phy_power()
218 				       rk_phy->reg_offset + GRF_EMMCPHY_STATUS,  in rockchip_emmc_phy_power()
229 static int rockchip_emmc_phy_init(struct phy *phy)  in rockchip_emmc_phy_init()  argument
231 	struct rockchip_emmc_phy *rk_phy = phy_get_drvdata(phy);  in rockchip_emmc_phy_init()
237 	 * - PHY driver to probe  in rockchip_emmc_phy_init()
238 	 * - SDHCI driver to start probe  in rockchip_emmc_phy_init()
239 	 * - SDHCI driver to register it's clock  in rockchip_emmc_phy_init()
240 	 * - SDHCI driver to get the PHY  in rockchip_emmc_phy_init()
241 	 * - SDHCI driver to init the PHY  in rockchip_emmc_phy_init()
246 	 * NOTE: we don't do anything special for EPROBE_DEFER here.  Given the  in rockchip_emmc_phy_init()
247 	 * above expected use case, EPROBE_DEFER isn't sensible to expect, so  in rockchip_emmc_phy_init()
250 	rk_phy->emmcclk = clk_get_optional(&phy->dev, "emmcclk");  in rockchip_emmc_phy_init()
251 	if (IS_ERR(rk_phy->emmcclk)) {  in rockchip_emmc_phy_init()
252 		ret = PTR_ERR(rk_phy->emmcclk);  in rockchip_emmc_phy_init()
253 		dev_err(&phy->dev, "Error getting emmcclk: %d\n", ret);  in rockchip_emmc_phy_init()
254 		rk_phy->emmcclk = NULL;  in rockchip_emmc_phy_init()
260 static int rockchip_emmc_phy_exit(struct phy *phy)  in rockchip_emmc_phy_exit()  argument
262 	struct rockchip_emmc_phy *rk_phy = phy_get_drvdata(phy);  in rockchip_emmc_phy_exit()
264 	clk_put(rk_phy->emmcclk);  in rockchip_emmc_phy_exit()
269 static int rockchip_emmc_phy_power_off(struct phy *phy)  in rockchip_emmc_phy_power_off()  argument
271 	/* Power down emmc phy analog blocks */  in rockchip_emmc_phy_power_off()
272 	return rockchip_emmc_phy_power(phy, PHYCTRL_PDB_PWR_OFF);  in rockchip_emmc_phy_power_off()
275 static int rockchip_emmc_phy_power_on(struct phy *phy)  in rockchip_emmc_phy_power_on()  argument
277 	struct rockchip_emmc_phy *rk_phy = phy_get_drvdata(phy);  in rockchip_emmc_phy_power_on()
280 	regmap_write(rk_phy->reg_base,  in rockchip_emmc_phy_power_on()
281 		     rk_phy->reg_offset + GRF_EMMCPHY_CON6,  in rockchip_emmc_phy_power_on()
282 		     HIWORD_UPDATE(rk_phy->drive_impedance,  in rockchip_emmc_phy_power_on()
287 	regmap_write(rk_phy->reg_base,  in rockchip_emmc_phy_power_on()
288 		     rk_phy->reg_offset + GRF_EMMCPHY_CON0,  in rockchip_emmc_phy_power_on()
294 	regmap_write(rk_phy->reg_base,  in rockchip_emmc_phy_power_on()
295 		     rk_phy->reg_offset + GRF_EMMCPHY_CON0,  in rockchip_emmc_phy_power_on()
300 	/* Power up emmc phy analog blocks */  in rockchip_emmc_phy_power_on()
301 	return rockchip_emmc_phy_power(phy, PHYCTRL_PDB_PWR_ON);  in rockchip_emmc_phy_power_on()
327 	dev_warn(&pdev->dev, "Invalid value %u for drive-impedance-ohm.\n",  in convert_drive_impedance_ohm()
334 	struct device *dev = &pdev->dev;  in rockchip_emmc_phy_probe()
336 	struct phy *generic_phy;  in rockchip_emmc_phy_probe()
342 	if (!dev->parent || !dev->parent->of_node)  in rockchip_emmc_phy_probe()
343 		return -ENODEV;  in rockchip_emmc_phy_probe()
345 	grf = syscon_node_to_regmap(dev->parent->of_node);  in rockchip_emmc_phy_probe()
353 		return -ENOMEM;  in rockchip_emmc_phy_probe()
355 	if (of_property_read_u32(dev->of_node, "reg", &reg_offset)) {  in rockchip_emmc_phy_probe()
357 			dev->of_node);  in rockchip_emmc_phy_probe()
358 		return -EINVAL;  in rockchip_emmc_phy_probe()
361 	rk_phy->reg_offset = reg_offset;  in rockchip_emmc_phy_probe()
362 	rk_phy->reg_base = grf;  in rockchip_emmc_phy_probe()
363 	rk_phy->drive_impedance = PHYCTRL_DR_50OHM;  in rockchip_emmc_phy_probe()
365 	if (!of_property_read_u32(dev->of_node, "drive-impedance-ohm", &val))  in rockchip_emmc_phy_probe()
366 		rk_phy->drive_impedance = convert_drive_impedance_ohm(pdev, val);  in rockchip_emmc_phy_probe()
368 	generic_phy = devm_phy_create(dev, dev->of_node, &ops);  in rockchip_emmc_phy_probe()
370 		dev_err(dev, "failed to create PHY\n");  in rockchip_emmc_phy_probe()
381 	{ .compatible = "rockchip,rk3399-emmc-phy" },
390 		.name	= "rockchip-emmc-phy",
397 MODULE_AUTHOR("Shawn Lin <shawn.lin@rock-chips.com>");
398 MODULE_DESCRIPTION("Rockchip EMMC PHY driver");