1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * Universal Flash Storage Host controller Platform bus based glue driver
4 * Copyright (C) 2011-2013 Samsung India Software Operations
7 * Santosh Yaraganavi <santosh.sy@samsung.com>
8 * Vinayak Holikatti <h.vinayak@samsung.com>
11 #include <linux/platform_device.h>
12 #include <linux/pm_runtime.h>
16 #include "ufshcd-pltfrm.h"
19 #define UFSHCD_DEFAULT_LANES_PER_DIRECTION 2
21 static int ufshcd_parse_clock_info(struct ufs_hba *hba)
26 struct device *dev = hba->dev;
27 struct device_node *np = dev->of_node;
30 struct ufs_clk_info *clki;
37 cnt = of_property_count_strings(np, "clock-names");
38 if (!cnt || (cnt == -EINVAL)) {
39 dev_info(dev, "%s: Unable to find clocks, assuming enabled\n",
42 dev_err(dev, "%s: count clock strings failed, err %d\n",
50 if (!of_get_property(np, "freq-table-hz", &len)) {
51 dev_info(dev, "freq-table-hz property not specified\n");
58 sz = len / sizeof(*clkfreq);
60 dev_err(dev, "%s len mismatch\n", "freq-table-hz");
65 clkfreq = devm_kcalloc(dev, sz, sizeof(*clkfreq),
72 ret = of_property_read_u32_array(np, "freq-table-hz",
74 if (ret && (ret != -EINVAL)) {
75 dev_err(dev, "%s: error reading array %d\n",
76 "freq-table-hz", ret);
80 for (i = 0; i < sz; i += 2) {
81 ret = of_property_read_string_index(np,
82 "clock-names", i/2, (const char **)&name);
86 clki = devm_kzalloc(dev, sizeof(*clki), GFP_KERNEL);
92 clki->min_freq = clkfreq[i];
93 clki->max_freq = clkfreq[i+1];
94 clki->name = kstrdup(name, GFP_KERNEL);
95 if (!strcmp(name, "ref_clk"))
96 clki->keep_link_active = true;
97 dev_dbg(dev, "%s: min %u max %u name %s\n", "freq-table-hz",
98 clki->min_freq, clki->max_freq, clki->name);
99 list_add_tail(&clki->list, &hba->clk_list_head);
105 #define MAX_PROP_SIZE 32
106 static int ufshcd_populate_vreg(struct device *dev, const char *name,
107 struct ufs_vreg **out_vreg)
109 char prop_name[MAX_PROP_SIZE];
110 struct ufs_vreg *vreg = NULL;
111 struct device_node *np = dev->of_node;
114 dev_err(dev, "%s: non DT initialization\n", __func__);
118 snprintf(prop_name, MAX_PROP_SIZE, "%s-supply", name);
119 if (!of_parse_phandle(np, prop_name, 0)) {
120 dev_info(dev, "%s: Unable to find %s regulator, assuming enabled\n",
121 __func__, prop_name);
125 vreg = devm_kzalloc(dev, sizeof(*vreg), GFP_KERNEL);
129 vreg->name = kstrdup(name, GFP_KERNEL);
131 snprintf(prop_name, MAX_PROP_SIZE, "%s-max-microamp", name);
132 if (of_property_read_u32(np, prop_name, &vreg->max_uA)) {
133 dev_info(dev, "%s: unable to find %s\n", __func__, prop_name);
142 * ufshcd_parse_regulator_info - get regulator info from device tree
143 * @hba: per adapter instance
145 * Get regulator info from device tree for vcc, vccq, vccq2 power supplies.
146 * If any of the supplies are not defined it is assumed that they are always-on
147 * and hence return zero. If the property is defined but parsing is failed
148 * then return corresponding error.
150 static int ufshcd_parse_regulator_info(struct ufs_hba *hba)
153 struct device *dev = hba->dev;
154 struct ufs_vreg_info *info = &hba->vreg_info;
156 err = ufshcd_populate_vreg(dev, "vdd-hba", &info->vdd_hba);
160 err = ufshcd_populate_vreg(dev, "vcc", &info->vcc);
164 err = ufshcd_populate_vreg(dev, "vccq", &info->vccq);
168 err = ufshcd_populate_vreg(dev, "vccq2", &info->vccq2);
173 void ufshcd_pltfrm_shutdown(struct platform_device *pdev)
175 ufshcd_shutdown((struct ufs_hba *)platform_get_drvdata(pdev));
177 EXPORT_SYMBOL_GPL(ufshcd_pltfrm_shutdown);
179 static void ufshcd_init_lanes_per_dir(struct ufs_hba *hba)
181 struct device *dev = hba->dev;
184 ret = of_property_read_u32(dev->of_node, "lanes-per-direction",
185 &hba->lanes_per_direction);
188 "%s: failed to read lanes-per-direction, ret=%d\n",
190 hba->lanes_per_direction = UFSHCD_DEFAULT_LANES_PER_DIRECTION;
195 * ufshcd_get_pwr_dev_param - get finally agreed attributes for
197 * @pltfrm_param: pointer to platform parameters
198 * @dev_max: pointer to device attributes
199 * @agreed_pwr: returned agreed attributes
201 * Returns 0 on success, non-zero value on failure
203 int ufshcd_get_pwr_dev_param(struct ufs_dev_params *pltfrm_param,
204 struct ufs_pa_layer_attr *dev_max,
205 struct ufs_pa_layer_attr *agreed_pwr)
209 bool is_dev_sup_hs = false;
210 bool is_pltfrm_max_hs = false;
212 if (dev_max->pwr_rx == FAST_MODE)
213 is_dev_sup_hs = true;
215 if (pltfrm_param->desired_working_mode == UFS_HS_MODE) {
216 is_pltfrm_max_hs = true;
217 min_pltfrm_gear = min_t(u32, pltfrm_param->hs_rx_gear,
218 pltfrm_param->hs_tx_gear);
220 min_pltfrm_gear = min_t(u32, pltfrm_param->pwm_rx_gear,
221 pltfrm_param->pwm_tx_gear);
225 * device doesn't support HS but
226 * pltfrm_param->desired_working_mode is HS,
227 * thus device and pltfrm_param don't agree
229 if (!is_dev_sup_hs && is_pltfrm_max_hs) {
230 pr_info("%s: device doesn't support HS\n",
233 } else if (is_dev_sup_hs && is_pltfrm_max_hs) {
235 * since device supports HS, it supports FAST_MODE.
236 * since pltfrm_param->desired_working_mode is also HS
237 * then final decision (FAST/FASTAUTO) is done according
238 * to pltfrm_params as it is the restricting factor
240 agreed_pwr->pwr_rx = pltfrm_param->rx_pwr_hs;
241 agreed_pwr->pwr_tx = agreed_pwr->pwr_rx;
244 * here pltfrm_param->desired_working_mode is PWM.
245 * it doesn't matter whether device supports HS or PWM,
246 * in both cases pltfrm_param->desired_working_mode will
249 agreed_pwr->pwr_rx = pltfrm_param->rx_pwr_pwm;
250 agreed_pwr->pwr_tx = agreed_pwr->pwr_rx;
254 * we would like tx to work in the minimum number of lanes
255 * between device capability and vendor preferences.
256 * the same decision will be made for rx
258 agreed_pwr->lane_tx = min_t(u32, dev_max->lane_tx,
259 pltfrm_param->tx_lanes);
260 agreed_pwr->lane_rx = min_t(u32, dev_max->lane_rx,
261 pltfrm_param->rx_lanes);
263 /* device maximum gear is the minimum between device rx and tx gears */
264 min_dev_gear = min_t(u32, dev_max->gear_rx, dev_max->gear_tx);
267 * if both device capabilities and vendor pre-defined preferences are
268 * both HS or both PWM then set the minimum gear to be the chosen
270 * if one is PWM and one is HS then the one that is PWM get to decide
271 * what is the gear, as it is the one that also decided previously what
272 * pwr the device will be configured to.
274 if ((is_dev_sup_hs && is_pltfrm_max_hs) ||
275 (!is_dev_sup_hs && !is_pltfrm_max_hs)) {
276 agreed_pwr->gear_rx =
277 min_t(u32, min_dev_gear, min_pltfrm_gear);
278 } else if (!is_dev_sup_hs) {
279 agreed_pwr->gear_rx = min_dev_gear;
281 agreed_pwr->gear_rx = min_pltfrm_gear;
283 agreed_pwr->gear_tx = agreed_pwr->gear_rx;
285 agreed_pwr->hs_rate = pltfrm_param->hs_rate;
289 EXPORT_SYMBOL_GPL(ufshcd_get_pwr_dev_param);
291 void ufshcd_init_pwr_dev_param(struct ufs_dev_params *dev_param)
293 dev_param->tx_lanes = 2;
294 dev_param->rx_lanes = 2;
295 dev_param->hs_rx_gear = UFS_HS_G3;
296 dev_param->hs_tx_gear = UFS_HS_G3;
297 dev_param->pwm_rx_gear = UFS_PWM_G4;
298 dev_param->pwm_tx_gear = UFS_PWM_G4;
299 dev_param->rx_pwr_pwm = SLOW_MODE;
300 dev_param->tx_pwr_pwm = SLOW_MODE;
301 dev_param->rx_pwr_hs = FAST_MODE;
302 dev_param->tx_pwr_hs = FAST_MODE;
303 dev_param->hs_rate = PA_HS_MODE_B;
304 dev_param->desired_working_mode = UFS_HS_MODE;
306 EXPORT_SYMBOL_GPL(ufshcd_init_pwr_dev_param);
309 * ufshcd_pltfrm_init - probe routine of the driver
310 * @pdev: pointer to Platform device handle
311 * @vops: pointer to variant ops
313 * Returns 0 on success, non-zero value on failure
315 int ufshcd_pltfrm_init(struct platform_device *pdev,
316 const struct ufs_hba_variant_ops *vops)
319 void __iomem *mmio_base;
321 struct device *dev = &pdev->dev;
323 mmio_base = devm_platform_ioremap_resource(pdev, 0);
324 if (IS_ERR(mmio_base)) {
325 err = PTR_ERR(mmio_base);
329 irq = platform_get_irq(pdev, 0);
335 err = ufshcd_alloc_host(dev, &hba);
337 dev_err(&pdev->dev, "Allocation failed\n");
343 err = ufshcd_parse_clock_info(hba);
345 dev_err(&pdev->dev, "%s: clock parse failed %d\n",
349 err = ufshcd_parse_regulator_info(hba);
351 dev_err(&pdev->dev, "%s: regulator init failed %d\n",
356 ufshcd_init_lanes_per_dir(hba);
358 err = ufshcd_init(hba, mmio_base, irq);
360 dev_err(dev, "Initialization failed\n");
364 platform_set_drvdata(pdev, hba);
366 pm_runtime_set_active(&pdev->dev);
367 pm_runtime_enable(&pdev->dev);
372 ufshcd_dealloc_host(hba);
376 EXPORT_SYMBOL_GPL(ufshcd_pltfrm_init);
378 MODULE_AUTHOR("Santosh Yaragnavi <santosh.sy@samsung.com>");
379 MODULE_AUTHOR("Vinayak Holikatti <h.vinayak@samsung.com>");
380 MODULE_DESCRIPTION("UFS host controller Platform bus based glue driver");
381 MODULE_LICENSE("GPL");
382 MODULE_VERSION(UFSHCD_DRIVER_VERSION);