1 // SPDX-License-Identifier: GPL-2.0-or-later
3  * Driver for Renesas 9-series PCIe clock generator driver
6  *   - 9FGV/9DBV/9DMV/9FGL/9DML/9QXL/9SQ
8  *   - 9FGV0241
9  *   - 9FGV0441
14 #include <linux/clk-provider.h>
52 /* Supported Renesas 9-series models. */
53 enum rs9_model {
58 /* Structure to describe features of a particular 9-series model */
60 	const enum rs9_model	model;  member
76  * Renesas 9-series i2c regmap
112 		return -EIO;  in rs9_regmap_i2c_write()
124 	xfer[0].addr = i2c->addr;  in rs9_regmap_i2c_read()
129 	xfer[1].addr = i2c->addr;  in rs9_regmap_i2c_read()
134 	ret = i2c_transfer(i2c->adapter, xfer, 2);  in rs9_regmap_i2c_read()
138 		return -EIO;  in rs9_regmap_i2c_read()
163 	enum rs9_model model = rs9->chip_info->model;  in rs9_calc_dif()  local
165 	if (model == RENESAS_9FGV0241)  in rs9_calc_dif()
167 	else if (model == RENESAS_9FGV0441)  in rs9_calc_dif()
175 	struct i2c_client *client = rs9->client;  in rs9_get_output_config()
183 	rs9->clk_dif_sr |= dif;  in rs9_get_output_config()
186 	np = of_get_child_by_name(client->dev.of_node, name);  in rs9_get_output_config()
191 	ret = of_property_read_u32(np, "renesas,slew-rate", &sr);  in rs9_get_output_config()
195 			rs9->clk_dif_sr &= ~dif;  in rs9_get_output_config()
197 			rs9->clk_dif_sr |= dif;  in rs9_get_output_config()
199 			ret = dev_err_probe(&client->dev, -EINVAL,  in rs9_get_output_config()
200 					    "Invalid renesas,slew-rate value\n");  in rs9_get_output_config()
208 	struct i2c_client *client = rs9->client;  in rs9_get_common_config()
209 	struct device_node *np = client->dev.of_node;  in rs9_get_common_config()
214 	rs9->pll_amplitude = RS9_REG_SS_AMP_0V7;  in rs9_get_common_config()
215 	rs9->pll_ssc = RS9_REG_SS_SSC_100;  in rs9_get_common_config()
218 	ret = of_property_read_u32(np, "renesas,out-amplitude-microvolt",  in rs9_get_common_config()
222 			rs9->pll_amplitude = RS9_REG_SS_AMP_0V6;  in rs9_get_common_config()
224 			rs9->pll_amplitude = RS9_REG_SS_AMP_0V7;  in rs9_get_common_config()
226 			rs9->pll_amplitude = RS9_REG_SS_AMP_0V8;  in rs9_get_common_config()
228 			rs9->pll_amplitude = RS9_REG_SS_AMP_0V9;  in rs9_get_common_config()
230 			return dev_err_probe(&client->dev, -EINVAL,  in rs9_get_common_config()
231 					     "Invalid renesas,out-amplitude-microvolt value\n");  in rs9_get_common_config()
235 	ret = of_property_read_u32(np, "renesas,out-spread-spectrum", &ssc);  in rs9_get_common_config()
238 			rs9->pll_ssc = RS9_REG_SS_SSC_100;  in rs9_get_common_config()
239 		else if (ssc == 99750)	/* -0.25% ... down spread */  in rs9_get_common_config()
240 			rs9->pll_ssc = RS9_REG_SS_SSC_M025;  in rs9_get_common_config()
241 		else if (ssc == 99500)	/* -0.50% ... down spread */  in rs9_get_common_config()
242 			rs9->pll_ssc = RS9_REG_SS_SSC_M050;  in rs9_get_common_config()
244 			return dev_err_probe(&client->dev, -EINVAL,  in rs9_get_common_config()
245 					     "Invalid renesas,out-spread-spectrum value\n");  in rs9_get_common_config()
255 	/* If amplitude is non-default, update it. */  in rs9_update_config()
256 	if (rs9->pll_amplitude != RS9_REG_SS_AMP_0V7) {  in rs9_update_config()
257 		regmap_update_bits(rs9->regmap, RS9_REG_SS, RS9_REG_SS_AMP_MASK,  in rs9_update_config()
258 				   rs9->pll_amplitude);  in rs9_update_config()
261 	/* If SSC is non-default, update it. */  in rs9_update_config()
262 	if (rs9->pll_ssc != RS9_REG_SS_SSC_100) {  in rs9_update_config()
263 		regmap_update_bits(rs9->regmap, RS9_REG_SS, RS9_REG_SS_SSC_MASK,  in rs9_update_config()
264 				   rs9->pll_ssc);  in rs9_update_config()
267 	for (i = 0; i < rs9->chip_info->num_clks; i++) {  in rs9_update_config()
270 		if (rs9->clk_dif_sr & dif)  in rs9_update_config()
273 		regmap_update_bits(rs9->regmap, RS9_REG_SR, dif,  in rs9_update_config()
274 				   rs9->clk_dif_sr & dif);  in rs9_update_config()
282 	unsigned int idx = clkspec->args[0];  in rs9_of_clk_get()
284 	return rs9->clk_dif[idx];  in rs9_of_clk_get()
295 	rs9 = devm_kzalloc(&client->dev, sizeof(*rs9), GFP_KERNEL);  in rs9_probe()
297 		return -ENOMEM;  in rs9_probe()
300 	rs9->client = client;  in rs9_probe()
301 	rs9->chip_info = device_get_match_data(&client->dev);  in rs9_probe()
302 	if (!rs9->chip_info)  in rs9_probe()
303 		return -EINVAL;  in rs9_probe()
311 	for (i = 0; i < rs9->chip_info->num_clks; i++) {  in rs9_probe()
317 	rs9->regmap = devm_regmap_init(&client->dev, NULL,  in rs9_probe()
319 	if (IS_ERR(rs9->regmap))  in rs9_probe()
320 		return dev_err_probe(&client->dev, PTR_ERR(rs9->regmap),  in rs9_probe()
324 	ret = regmap_write(rs9->regmap, RS9_REG_BCP, 1);  in rs9_probe()
328 	ret = regmap_read(rs9->regmap, RS9_REG_VID, &vid);  in rs9_probe()
332 	ret = regmap_read(rs9->regmap, RS9_REG_DID, &did);  in rs9_probe()
336 	if (vid != RS9_REG_VID_IDT || did != rs9->chip_info->did)  in rs9_probe()
337 		return dev_err_probe(&client->dev, -ENODEV,  in rs9_probe()
340 				     rs9->chip_info->did);  in rs9_probe()
343 	for (i = 0; i < rs9->chip_info->num_clks; i++) {  in rs9_probe()
345 		hw = devm_clk_hw_register_fixed_factor_index(&client->dev, name,  in rs9_probe()
350 		rs9->clk_dif[i] = hw;  in rs9_probe()
353 	ret = devm_of_clk_add_hw_provider(&client->dev, rs9_of_clk_get, rs9);  in rs9_probe()
364 	regcache_cache_only(rs9->regmap, true);  in rs9_suspend()
365 	regcache_mark_dirty(rs9->regmap);  in rs9_suspend()
375 	regcache_cache_only(rs9->regmap, false);  in rs9_resume()
376 	ret = regcache_sync(rs9->regmap);  in rs9_resume()
383 	.model		= RENESAS_9FGV0241,
389 	.model		= RENESAS_9FGV0441,
412 		.name = "clk-renesas-pcie-9series",
422 MODULE_DESCRIPTION("Renesas 9-series PCIe clock generator driver");