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96 lines
2.9 KiB
Diff
96 lines
2.9 KiB
Diff
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From 3f65aaaabc3ddc09bacf06bb608f8bab5671fb18 Mon Sep 17 00:00:00 2001
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From: Grigori Goronzy <greg@blackbox>
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Date: Mon, 11 Jun 2012 18:52:04 +0200
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Subject: [PATCH 012/174] sdhci-bcm2708: remove custom clock handling
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The custom clock handling code is redundant and buggy. The MMC/SDHCI
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subsystem does a better job than it, so remove it for good.
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---
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drivers/mmc/host/sdhci-bcm2708.c | 65 +---------------------------------------
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1 file changed, 1 insertion(+), 64 deletions(-)
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--- a/drivers/mmc/host/sdhci-bcm2708.c
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+++ b/drivers/mmc/host/sdhci-bcm2708.c
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@@ -353,68 +353,9 @@ void sdhci_bcm2708_writeb(struct sdhci_h
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static unsigned int sdhci_bcm2708_get_max_clock(struct sdhci_host *host)
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{
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- return 20000000; // this value is in Hz (20MHz)
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+ return BCM2708_EMMC_CLOCK_FREQ;
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}
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-static unsigned int sdhci_bcm2708_get_timeout_clock(struct sdhci_host *host)
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-{
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- if(host->clock)
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- return (host->clock / 1000); // this value is in kHz (100MHz)
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- else
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- return (sdhci_bcm2708_get_max_clock(host) / 1000);
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-}
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-
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-static void sdhci_bcm2708_set_clock(struct sdhci_host *host, unsigned int clock)
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-{
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- int div = 0;
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- u16 clk = 0;
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- unsigned long timeout;
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-
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- if (clock == host->clock)
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- return;
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-
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- sdhci_writew(host, 0, SDHCI_CLOCK_CONTROL);
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-
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- if (clock == 0)
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- goto out;
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-
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- if (BCM2708_EMMC_CLOCK_FREQ <= clock)
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- div = 1;
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- else {
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- for (div = 2; div < SDHCI_MAX_DIV_SPEC_300; div += 2) {
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- if ((BCM2708_EMMC_CLOCK_FREQ / div) <= clock)
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- break;
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- }
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- }
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-
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- DBG( "desired SD clock: %d, actual: %d\n",
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- clock, BCM2708_EMMC_CLOCK_FREQ / div);
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-
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- clk |= (div & SDHCI_DIV_MASK) << SDHCI_DIVIDER_SHIFT;
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- clk |= ((div & SDHCI_DIV_HI_MASK) >> SDHCI_DIV_MASK_LEN)
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- << SDHCI_DIVIDER_HI_SHIFT;
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- clk |= SDHCI_CLOCK_INT_EN;
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-
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- sdhci_writew(host, clk, SDHCI_CLOCK_CONTROL);
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-
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- timeout = 20;
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- while (!((clk = sdhci_readw(host, SDHCI_CLOCK_CONTROL))
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- & SDHCI_CLOCK_INT_STABLE)) {
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- if (timeout == 0) {
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- printk(KERN_ERR "%s: Internal clock never "
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- "stabilised.\n", mmc_hostname(host->mmc));
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- return;
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- }
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- timeout--;
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- mdelay(1);
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- }
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-
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- clk |= SDHCI_CLOCK_CARD_EN;
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- sdhci_writew(host, clk, SDHCI_CLOCK_CONTROL);
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-out:
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- host->clock = clock;
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- }
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-
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/*****************************************************************************\
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* *
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* DMA Operation *
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@@ -1189,11 +1130,7 @@ static struct sdhci_ops sdhci_bcm2708_op
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#else
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#error The BCM2708 SDHCI driver needs CONFIG_MMC_SDHCI_IO_ACCESSORS to be set
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#endif
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- //.enable_dma = NULL,
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- .set_clock = sdhci_bcm2708_set_clock,
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.get_max_clock = sdhci_bcm2708_get_max_clock,
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- //.get_min_clock = NULL,
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- .get_timeout_clock = sdhci_bcm2708_get_timeout_clock,
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#ifdef CONFIG_MMC_SDHCI_BCM2708_DMA
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// Platform DMA operations
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