3  * UFS PHY driver for Samsung SoC
18 #include <linux/phy/phy.h>
22 #include "phy-samsung-ufs.h"
24 #define for_each_phy_lane(phy, i) \  argument
25 	for (i = 0; i < (phy)->lane_cnt; i++)
31 static void samsung_ufs_phy_config(struct samsung_ufs_phy *phy,  in samsung_ufs_phy_config()  argument
39 		writel(cfg->val, (phy)->reg_pma + cfg->off_0);  in samsung_ufs_phy_config()
43 			writel(cfg->val, (phy)->reg_pma + cfg->off_1);  in samsung_ufs_phy_config()
48 static int samsung_ufs_phy_wait_for_lock_acq(struct phy *phy)  in samsung_ufs_phy_wait_for_lock_acq()  argument
50 	struct samsung_ufs_phy *ufs_phy = get_samsung_ufs_phy(phy);  in samsung_ufs_phy_wait_for_lock_acq()
61 			"failed to get phy pll lock acquisition %d\n", err);  in samsung_ufs_phy_wait_for_lock_acq()
71 			"failed to get phy cdr lock acquisition %d\n", err);  in samsung_ufs_phy_wait_for_lock_acq()
76 static int samsung_ufs_phy_calibrate(struct phy *phy)  in samsung_ufs_phy_calibrate()  argument
78 	struct samsung_ufs_phy *ufs_phy = get_samsung_ufs_phy(phy);  in samsung_ufs_phy_calibrate()
86 		dev_err(ufs_phy->dev, "invalid phy config index %d\n", ufs_phy->ufs_phy_state);  in samsung_ufs_phy_calibrate()
101 		err = samsung_ufs_phy_wait_for_lock_acq(phy);  in samsung_ufs_phy_calibrate()
104 	 * In Samsung ufshci, PHY need to be calibrated at different  in samsung_ufs_phy_calibrate()
107 	 * Below state machine to make sure to calibrate PHY in each  in samsung_ufs_phy_calibrate()
108 	 * state. Here after configuring PHY in a given state, will  in samsung_ufs_phy_calibrate()
109 	 * change the state to next state so that next state phy  in samsung_ufs_phy_calibrate()
128 		dev_err(ufs_phy->dev, "wrong state for phy calibration\n");  in samsung_ufs_phy_calibrate()
134 static int samsung_ufs_phy_clks_init(struct samsung_ufs_phy *phy)  in samsung_ufs_phy_clks_init()  argument
137 	const struct samsung_ufs_phy_drvdata *drvdata = phy->drvdata;  in samsung_ufs_phy_clks_init()
140 	phy->clks = devm_kcalloc(phy->dev, num_clks, sizeof(*phy->clks),  in samsung_ufs_phy_clks_init()
142 	if (!phy->clks)  in samsung_ufs_phy_clks_init()
146 		phy->clks[i].id = drvdata->clk_list[i];  in samsung_ufs_phy_clks_init()
148 	return devm_clk_bulk_get(phy->dev, num_clks, phy->clks);  in samsung_ufs_phy_clks_init()
151 static int samsung_ufs_phy_init(struct phy *phy)  in samsung_ufs_phy_init()  argument
153 	struct samsung_ufs_phy *ss_phy = get_samsung_ufs_phy(phy);  in samsung_ufs_phy_init()
155 	ss_phy->lane_cnt = phy->attrs.bus_width;  in samsung_ufs_phy_init()
161 static int samsung_ufs_phy_power_on(struct phy *phy)  in samsung_ufs_phy_power_on()  argument
163 	struct samsung_ufs_phy *ss_phy = get_samsung_ufs_phy(phy);  in samsung_ufs_phy_power_on()
170 		dev_err(ss_phy->dev, "failed to enable ufs phy clocks\n");  in samsung_ufs_phy_power_on()
175 		ret = samsung_ufs_phy_calibrate(phy);  in samsung_ufs_phy_power_on()
177 			dev_err(ss_phy->dev, "ufs phy calibration failed\n");  in samsung_ufs_phy_power_on()
183 static int samsung_ufs_phy_power_off(struct phy *phy)  in samsung_ufs_phy_power_off()  argument
185 	struct samsung_ufs_phy *ss_phy = get_samsung_ufs_phy(phy);  in samsung_ufs_phy_power_off()
194 static int samsung_ufs_phy_set_mode(struct phy *generic_phy,  in samsung_ufs_phy_set_mode()
207 static int samsung_ufs_phy_exit(struct phy *phy)  in samsung_ufs_phy_exit()  argument
209 	struct samsung_ufs_phy *ss_phy = get_samsung_ufs_phy(phy);  in samsung_ufs_phy_exit()
232 	struct samsung_ufs_phy *phy;  in samsung_ufs_phy_probe()  local
233 	struct phy *gen_phy;  in samsung_ufs_phy_probe()
246 	phy = devm_kzalloc(dev, sizeof(*phy), GFP_KERNEL);  in samsung_ufs_phy_probe()
247 	if (!phy) {  in samsung_ufs_phy_probe()
252 	phy->reg_pma = devm_platform_ioremap_resource_byname(pdev, "phy-pma");  in samsung_ufs_phy_probe()
253 	if (IS_ERR(phy->reg_pma)) {  in samsung_ufs_phy_probe()
254 		err = PTR_ERR(phy->reg_pma);  in samsung_ufs_phy_probe()
258 	phy->reg_pmu = syscon_regmap_lookup_by_phandle(  in samsung_ufs_phy_probe()
260 	if (IS_ERR(phy->reg_pmu)) {  in samsung_ufs_phy_probe()
261 		err = PTR_ERR(phy->reg_pmu);  in samsung_ufs_phy_probe()
269 		dev_err(dev, "failed to create PHY for ufs-phy\n");  in samsung_ufs_phy_probe()
274 	phy->dev = dev;  in samsung_ufs_phy_probe()
275 	phy->drvdata = drvdata;  in samsung_ufs_phy_probe()
276 	phy->cfgs = drvdata->cfgs;  in samsung_ufs_phy_probe()
277 	memcpy(&phy->isol, &drvdata->isol, sizeof(phy->isol));  in samsung_ufs_phy_probe()
281 		phy->isol.offset = isol_offset;  in samsung_ufs_phy_probe()
283 	phy->lane_cnt = PHY_DEF_LANE_CNT;  in samsung_ufs_phy_probe()
285 	err = samsung_ufs_phy_clks_init(phy);  in samsung_ufs_phy_probe()
287 		dev_err(dev, "failed to get phy clocks\n");  in samsung_ufs_phy_probe()
291 	phy_set_drvdata(gen_phy, phy);  in samsung_ufs_phy_probe()
296 		dev_err(dev, "failed to register phy-provider\n");  in samsung_ufs_phy_probe()
305 		.compatible = "samsung,exynos7-ufs-phy",
308 		.compatible = "samsung,exynosautov9-ufs-phy",
311 		.compatible = "tesla,fsd-ufs-phy",
321 		.name = "samsung-ufs-phy",
326 MODULE_DESCRIPTION("Samsung SoC UFS PHY Driver");