1 // SPDX-License-Identifier: GPL-2.0
11 #include <linux/mmc/host.h>
18 #include "dw_mmc-pltfm.h"
36 	if (ios->timing == MMC_TIMING_MMC_DDR52 || ios->timing == MMC_TIMING_UHS_DDR50) {  in dw_mci_starfive_set_ios()
37 		clock = (ios->clock > 50000000 && ios->clock <= 52000000) ? 100000000 : ios->clock;  in dw_mci_starfive_set_ios()
38 		ret = clk_set_rate(host->ciu_clk, clock);  in dw_mci_starfive_set_ios()
40 			dev_dbg(host->dev, "Use an external frequency divider %uHz\n", ios->clock);  in dw_mci_starfive_set_ios()
41 		host->bus_hz = clk_get_rate(host->ciu_clk);  in dw_mci_starfive_set_ios()
43 		dev_dbg(host->dev, "Using the internal divider\n");  in dw_mci_starfive_set_ios()
51 	struct dw_mci *host = slot->host;  in dw_mci_starfive_execute_tuning()
52 	struct starfive_priv *priv = host->priv;  in dw_mci_starfive_execute_tuning()
53 	int rise_point = -1, fall_point = -1;  in dw_mci_starfive_execute_tuning()
65 		regval = i << priv->syscon_shift;  in dw_mci_starfive_execute_tuning()
66 		err = regmap_update_bits(priv->reg_syscon, priv->syscon_offset,  in dw_mci_starfive_execute_tuning()
67 						priv->syscon_mask, regval);  in dw_mci_starfive_execute_tuning()
72 		err = mmc_send_tuning(slot->mmc, opcode, NULL);  in dw_mci_starfive_execute_tuning()
78 				fall_point = i - 1;  in dw_mci_starfive_execute_tuning()
83 		if (rise_point != -1 && fall_point != -1)  in dw_mci_starfive_execute_tuning()
92 		if (rise_point == -1)  in dw_mci_starfive_execute_tuning()
94 		if (fall_point == -1)  in dw_mci_starfive_execute_tuning()
95 			fall_point = grade - 1;  in dw_mci_starfive_execute_tuning()
98 			    (grade - 1))  in dw_mci_starfive_execute_tuning()
101 				i = (rise_point + grade - 1) / 2;  in dw_mci_starfive_execute_tuning()
106 		regval = i << priv->syscon_shift;  in dw_mci_starfive_execute_tuning()
107 		err = regmap_update_bits(priv->reg_syscon, priv->syscon_offset,  in dw_mci_starfive_execute_tuning()
108 						priv->syscon_mask, regval);  in dw_mci_starfive_execute_tuning()
113 		dev_info(host->dev, "Found valid delay chain! use it [delay=%d]\n", i);  in dw_mci_starfive_execute_tuning()
115 		dev_err(host->dev, "No valid delay chain! use default\n");  in dw_mci_starfive_execute_tuning()
116 		err = -EINVAL;  in dw_mci_starfive_execute_tuning()
129 	priv = devm_kzalloc(host->dev, sizeof(*priv), GFP_KERNEL);  in dw_mci_starfive_parse_dt()
131 		return -ENOMEM;  in dw_mci_starfive_parse_dt()
133 	ret = of_parse_phandle_with_fixed_args(host->dev->of_node,  in dw_mci_starfive_parse_dt()
136 		dev_err(host->dev, "Failed to parse starfive,sysreg\n");  in dw_mci_starfive_parse_dt()
137 		return -EINVAL;  in dw_mci_starfive_parse_dt()
140 	priv->reg_syscon = syscon_node_to_regmap(args.np);  in dw_mci_starfive_parse_dt()
142 	if (IS_ERR(priv->reg_syscon))  in dw_mci_starfive_parse_dt()
143 		return PTR_ERR(priv->reg_syscon);  in dw_mci_starfive_parse_dt()
145 	priv->syscon_offset = args.args[0];  in dw_mci_starfive_parse_dt()
146 	priv->syscon_shift  = args.args[1];  in dw_mci_starfive_parse_dt()
147 	priv->syscon_mask   = args.args[2];  in dw_mci_starfive_parse_dt()
149 	host->priv = priv;  in dw_mci_starfive_parse_dt()
162 	{ .compatible = "starfive,jh7110-mmc",
184 MODULE_DESCRIPTION("StarFive JH7110 Specific DW-MSHC Driver Extension");