1 // SPDX-License-Identifier: GPL-2.0-only
3  * Intel ThunderBay eMMC PHY driver
15 #include <linux/phy/phy.h>
18 /* eMMC/SD/SDIO core/phy configuration registers */
134 /* Phy power status */
140  * To avoid incorrectly setting the phy for init(400KHZ) "phy_power_sts" is used.
141  * When actual clock is set always phy is powered off once and then powered on.
144  * 0 --> init settings
145  * 1 --> actual settings
159 	tmp = readl(tbh_phy->reg_base + offset);  in update_reg()
162 	writel(tmp, tbh_phy->reg_base + offset);  in update_reg()
165 static int thunderbay_emmc_phy_power(struct phy *phy, bool power_on)  in thunderbay_emmc_phy_power()  argument
167 	struct thunderbay_emmc_phy *tbh_phy = phy_get_drvdata(phy);  in thunderbay_emmc_phy_power()
175 	rate = clk_get_rate(tbh_phy->emmcclk);  in thunderbay_emmc_phy_power()
192 	rate = clk_get_rate(tbh_phy->emmcclk);  in thunderbay_emmc_phy_power()
230 		dev_warn(&phy->dev, "Unsupported rate: %lu\n", rate);  in thunderbay_emmc_phy_power()
246 		ret = readl_poll_timeout(tbh_phy->reg_base + PHY_STAT,  in thunderbay_emmc_phy_power()
249 			dev_err(&phy->dev, "caldone failed, ret=%d\n", ret);  in thunderbay_emmc_phy_power()
253 	rate = clk_get_rate(tbh_phy->emmcclk);  in thunderbay_emmc_phy_power()
265 		 * with clock speed. If we are powering on the PHY and the card clock  in thunderbay_emmc_phy_power()
276 		ret = readl_poll_timeout(tbh_phy->reg_base + PHY_STAT,  in thunderbay_emmc_phy_power()
279 			dev_err(&phy->dev, "dllrdy failed, ret=%d\n", ret);  in thunderbay_emmc_phy_power()
290 static int thunderbay_emmc_phy_init(struct phy *phy)  in thunderbay_emmc_phy_init()  argument
292 	struct thunderbay_emmc_phy *tbh_phy = phy_get_drvdata(phy);  in thunderbay_emmc_phy_init()
294 	tbh_phy->emmcclk = clk_get(&phy->dev, "emmcclk");  in thunderbay_emmc_phy_init()
296 	return PTR_ERR_OR_ZERO(tbh_phy->emmcclk);  in thunderbay_emmc_phy_init()
299 static int thunderbay_emmc_phy_exit(struct phy *phy)  in thunderbay_emmc_phy_exit()  argument
301 	struct thunderbay_emmc_phy *tbh_phy = phy_get_drvdata(phy);  in thunderbay_emmc_phy_exit()
303 	clk_put(tbh_phy->emmcclk);  in thunderbay_emmc_phy_exit()
308 static int thunderbay_emmc_phy_power_on(struct phy *phy)  in thunderbay_emmc_phy_power_on()  argument
310 	struct thunderbay_emmc_phy *tbh_phy = phy_get_drvdata(phy);  in thunderbay_emmc_phy_power_on()
329 	if (tbh_phy->phy_power_sts == PHY_UNINITIALIZED) {  in thunderbay_emmc_phy_power_on()
340 	} else if (tbh_phy->phy_power_sts == PHY_INITIALIZED) {  in thunderbay_emmc_phy_power_on()
342 		rate = clk_get_rate(tbh_phy->emmcclk);  in thunderbay_emmc_phy_power_on()
424 		tbh_phy->phy_power_sts = PHY_UNINITIALIZED;  in thunderbay_emmc_phy_power_on()
430 	return thunderbay_emmc_phy_power(phy, 1);  in thunderbay_emmc_phy_power_on()
433 static int thunderbay_emmc_phy_power_off(struct phy *phy)  in thunderbay_emmc_phy_power_off()  argument
435 	struct thunderbay_emmc_phy *tbh_phy = phy_get_drvdata(phy);  in thunderbay_emmc_phy_power_off()
437 	tbh_phy->phy_power_sts = PHY_INITIALIZED;  in thunderbay_emmc_phy_power_off()
439 	return thunderbay_emmc_phy_power(phy, 0);  in thunderbay_emmc_phy_power_off()
451 	{ .compatible = "intel,thunderbay-emmc-phy",
461 	struct device *dev = &pdev->dev;  in thunderbay_emmc_phy_probe()
463 	struct phy *generic_phy;  in thunderbay_emmc_phy_probe()
466 	if (!dev->of_node)  in thunderbay_emmc_phy_probe()
467 		return -ENODEV;  in thunderbay_emmc_phy_probe()
471 		return -ENOMEM;  in thunderbay_emmc_phy_probe()
474 	tbh_phy->reg_base = devm_ioremap_resource(&pdev->dev, res);  in thunderbay_emmc_phy_probe()
475 	if (IS_ERR(tbh_phy->reg_base))  in thunderbay_emmc_phy_probe()
476 		return PTR_ERR(tbh_phy->reg_base);  in thunderbay_emmc_phy_probe()
478 	tbh_phy->phy_power_sts = PHY_UNINITIALIZED;  in thunderbay_emmc_phy_probe()
479 	id = of_match_node(thunderbay_emmc_phy_of_match, pdev->dev.of_node);  in thunderbay_emmc_phy_probe()
482 		return -EINVAL;  in thunderbay_emmc_phy_probe()
485 	generic_phy = devm_phy_create(dev, dev->of_node, id->data);  in thunderbay_emmc_phy_probe()
487 		dev_err(dev, "failed to create PHY\n");  in thunderbay_emmc_phy_probe()
500 		.name	 = "thunderbay-emmc-phy",
508 MODULE_DESCRIPTION("Intel Thunder Bay eMMC PHY driver");