mmc: SDHC 3.0: support 10-bit divided clock mode (85105c53) · Commits · 戴 / test

drivers/mmc/host/sdhci.c

+20 −5

Original line number	Diff line number	Diff line
		@@ -1001,13 +1001,28 @@ static void sdhci_set_clock(struct sdhci_host *host, unsigned int clock)
		if (clock == 0)
		goto out;

		if (host->version >= SDHCI_SPEC_300) {
		/* Version 3.00 divisors must be a multiple of 2. */
		if (host->max_clk <= clock)
		div = 1;
		else {
		for (div = 2; div < 2046; div += 2) {
		if ((host->max_clk / div) <= clock)
		break;
		}
		}
		} else {
		/* Version 2.00 divisors must be a power of 2. */
		for (div = 1; div < 256; div *= 2) {
		if ((host->max_clk / div) <= clock)
		break;
		}
		}
		div >>= 1;

		clk = div << SDHCI_DIVIDER_SHIFT;
		clk = (div & SDHCI_DIV_MASK) << SDHCI_DIVIDER_SHIFT;
		clk \|= ((div & SDHCI_DIV_HI_MASK) >> SDHCI_DIV_MASK_LEN)
		<< SDHCI_DIVIDER_HI_SHIFT;
		clk \|= SDHCI_CLOCK_INT_EN;
		sdhci_writew(host, clk, SDHCI_CLOCK_CONTROL);

		@@ -1708,7 +1723,7 @@ int sdhci_add_host(struct sdhci_host *host)
		host->version = sdhci_readw(host, SDHCI_HOST_VERSION);
		host->version = (host->version & SDHCI_SPEC_VER_MASK)
		>> SDHCI_SPEC_VER_SHIFT;
		if (host->version > SDHCI_SPEC_200) {
		if (host->version > SDHCI_SPEC_300) {
		printk(KERN_ERR "%s: Unknown controller version (%d). "
		"You may experience problems.\n", mmc_hostname(mmc),
		host->version);

+5 −0

Original line number	Diff line number	Diff line
		@@ -86,6 +86,10 @@

		#define SDHCI_CLOCK_CONTROL 0x2C
		#define SDHCI_DIVIDER_SHIFT 8
		#define SDHCI_DIVIDER_HI_SHIFT 6
		#define SDHCI_DIV_MASK 0xFF
		#define SDHCI_DIV_MASK_LEN 8
		#define SDHCI_DIV_HI_MASK 0x300
		#define SDHCI_CLOCK_CARD_EN 0x0004
		#define SDHCI_CLOCK_INT_STABLE 0x0002
		#define SDHCI_CLOCK_INT_EN 0x0001
		@@ -178,6 +182,7 @@
		#define SDHCI_SPEC_VER_SHIFT 0
		#define SDHCI_SPEC_100 0
		#define SDHCI_SPEC_200 1
		#define SDHCI_SPEC_300 2

		struct sdhci_ops;