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mmc: dw_mmc: support mmc power control with regulator 

This patch adds support for power regulators.

Signed-off-by: Jaehoon Chung <jh80.chung@samsung.com>
Signed-off-by: kyungmin Park <kyungmin.park@samsung.com>
Acked-by: Will Newton <will.newton@imgtec.com>
Signed-off-by: Chris Ball <cjb@laptop.org>
This commit is contained in:
Jaehoon Chung 2011-02-25 11:08:14 +09:00 committed by Chris Ball
parent e61cf1184d
commit c07946a335
2 changed files with 27 additions and 0 deletions
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25
drivers/mmc/host/dw_mmc.c
View File

@ -32,6 +32,7 @@
#include <linux/mmc/mmc.h>
#include <linux/mmc/dw_mmc.h>
#include <linux/bitops.h>
#include <linux/regulator/consumer.h>
#include "dw_mmc.h"
@ -1440,6 +1441,13 @@ static int __init dw_mci_init_slot(struct dw_mci *host, unsigned int id)
}
#endif /* CONFIG_MMC_DW_IDMAC */
host->vmmc = regulator_get(mmc_dev(mmc), "vmmc");
if (IS_ERR(host->vmmc)) {
printk(KERN_INFO "%s: no vmmc regulator found\n", mmc_hostname(mmc));
host->vmmc = NULL;
} else
regulator_enable(host->vmmc);
if (dw_mci_get_cd(mmc))
set_bit(DW_MMC_CARD_PRESENT, &slot->flags);
else
@ -1704,6 +1712,12 @@ err_dmaunmap:
host->sg_cpu, host->sg_dma);
iounmap(host->regs);
if (host->vmmc) {
regulator_disable(host->vmmc);
regulator_put(host->vmmc);
}
err_freehost:
kfree(host);
return ret;
@ -1735,6 +1749,11 @@ static int __exit dw_mci_remove(struct platform_device *pdev)
if (host->use_dma && host->dma_ops->exit)
host->dma_ops->exit(host);
if (host->vmmc) {
regulator_disable(host->vmmc);
regulator_put(host->vmmc);
}
iounmap(host->regs);
kfree(host);
@ -1750,6 +1769,9 @@ static int dw_mci_suspend(struct platform_device *pdev, pm_message_t mesg)
int i, ret;
struct dw_mci *host = platform_get_drvdata(pdev);
if (host->vmmc)
regulator_enable(host->vmmc);
for (i = 0; i < host->num_slots; i++) {
struct dw_mci_slot *slot = host->slot[i];
if (!slot)
@ -1765,6 +1787,9 @@ static int dw_mci_suspend(struct platform_device *pdev, pm_message_t mesg)
}
}
if (host->vmmc)
regulator_disable(host->vmmc);
return 0;
}

2
include/linux/mmc/dw_mmc.h
View File

@ -152,6 +152,8 @@ struct dw_mci {
/* Workaround flags */
u32 quirks;
struct regulator *vmmc; /* Power regulator */
};
/* DMA ops for Internal/External DMAC interface */