1 // SPDX-License-Identifier: GPL-2.0-only
16 #include "sdhci-pltfm.h"
23 static void sdhci_cns3xxx_set_clock(struct sdhci_host *host, unsigned int clock)  in sdhci_cns3xxx_set_clock()  argument
25 	struct device *dev = mmc_dev(host->mmc);  in sdhci_cns3xxx_set_clock()
26 	int div = 1;  in sdhci_cns3xxx_set_clock()  local
30 	host->mmc->actual_clock = 0;  in sdhci_cns3xxx_set_clock()
34 	if (clock == 0)  in sdhci_cns3xxx_set_clock()
37 	while (host->max_clk / div > clock) {  in sdhci_cns3xxx_set_clock()
42 		if (div < 4)  in sdhci_cns3xxx_set_clock()
43 			div += 1;  in sdhci_cns3xxx_set_clock()
44 		else if (div < 256)  in sdhci_cns3xxx_set_clock()
45 			div *= 2;  in sdhci_cns3xxx_set_clock()
50 	dev_dbg(dev, "desired SD clock: %d, actual: %d\n",  in sdhci_cns3xxx_set_clock()
51 		clock, host->max_clk / div);  in sdhci_cns3xxx_set_clock()
54 	if (div != 3)  in sdhci_cns3xxx_set_clock()
55 		div >>= 1;  in sdhci_cns3xxx_set_clock()
57 	clk = div << SDHCI_DIVIDER_SHIFT;  in sdhci_cns3xxx_set_clock()
65 			dev_warn(dev, "clock is unstable");  in sdhci_cns3xxx_set_clock()
68 		timeout--;  in sdhci_cns3xxx_set_clock()
100 		.name	= "sdhci-cns3xxx",