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mmc: bcm2835: Drop pointer to mmc_host from bcm2835_host

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The BCM2835 MMC host driver uses a pointer to get from the private
bcm2835_host structure to the generic mmc_host structure.  However the
latter is always immediately preceding the former in memory, so compute
its address with a subtraction (which is cheaper than a dereference) and
drop the superfluous pointer.

No functional change intended.

Signed-off-by: Lukas Wunner <lukas@wunner.de>
Cc: Frank Pavlic <f.pavlic@kunbus.de>
Cc: Alexander Graf <agraf@suse.de>
Reviewed-by: Alexander Graf <agraf@suse.de>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
This commit is contained in:
Lukas Wunner 2019-02-03 09:27:00 +01:00 committed by Ulf Hansson
parent e5c1e63c93
commit c58ccf2b6d
2 changed files with 15 additions and 10 deletions
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20
drivers/mmc/host/bcm2835.c
View File

@ -148,7 +148,6 @@ struct bcm2835_host {
void __iomem *ioaddr;
u32 phys_addr;
struct mmc_host *mmc;
struct platform_device *pdev;
int clock; /* Current clock speed */
@ -618,7 +617,7 @@ static void bcm2835_finish_request(struct bcm2835_host *host)
"failed to terminate DMA (%d)\n", err);
}
mmc_request_done(host->mmc, mrq);
mmc_request_done(mmc_from_priv(host), mrq);
}
static
@ -837,7 +836,7 @@ static void bcm2835_timeout(struct work_struct *work)
dev_err(dev, "timeout waiting for hardware interrupt.\n");
bcm2835_dumpregs(host);
bcm2835_reset(host->mmc);
bcm2835_reset(mmc_from_priv(host));
if (host->data) {
host->data->error = -ETIMEDOUT;
@ -1100,6 +1099,7 @@ static void bcm2835_dma_complete_work(struct work_struct *work)
static void bcm2835_set_clock(struct bcm2835_host *host, unsigned int clock)
{
struct mmc_host *mmc = mmc_from_priv(host);
int div;
/* The SDCDIV register has 11 bits, and holds (div - 2). But
@ -1143,18 +1143,18 @@ static void bcm2835_set_clock(struct bcm2835_host *host, unsigned int clock)
div = SDCDIV_MAX_CDIV;
clock = host->max_clk / (div + 2);
host->mmc->actual_clock = clock;
mmc->actual_clock = clock;
/* Calibrate some delays */
host->ns_per_fifo_word = (1000000000 / clock) *
((host->mmc->caps & MMC_CAP_4_BIT_DATA) ? 8 : 32);
((mmc->caps & MMC_CAP_4_BIT_DATA) ? 8 : 32);
host->cdiv = div;
writel(host->cdiv, host->ioaddr + SDCDIV);
/* Set the timeout to 500ms */
writel(host->mmc->actual_clock / 2, host->ioaddr + SDTOUT);
writel(mmc->actual_clock / 2, host->ioaddr + SDTOUT);
}
static void bcm2835_request(struct mmc_host *mmc, struct mmc_request *mrq)
@ -1264,7 +1264,7 @@ static const struct mmc_host_ops bcm2835_ops = {
static int bcm2835_add_host(struct bcm2835_host *host)
{
struct mmc_host *mmc = host->mmc;
struct mmc_host *mmc = mmc_from_priv(host);
struct device *dev = &host->pdev->dev;
char pio_limit_string[20];
int ret;
@ -1370,7 +1370,6 @@ static int bcm2835_probe(struct platform_device *pdev)
mmc->ops = &bcm2835_ops;
host = mmc_priv(mmc);
host->mmc = mmc;
host->pdev = pdev;
spin_lock_init(&host->lock);
@ -1441,8 +1440,9 @@ err:
static int bcm2835_remove(struct platform_device *pdev)
{
struct bcm2835_host *host = platform_get_drvdata(pdev);
struct mmc_host *mmc = mmc_from_priv(host);
mmc_remove_host(host->mmc);
mmc_remove_host(mmc);
writel(SDVDD_POWER_OFF, host->ioaddr + SDVDD);
@ -1454,7 +1454,7 @@ static int bcm2835_remove(struct platform_device *pdev)
if (host->dma_chan_rxtx)
dma_release_channel(host->dma_chan_rxtx);
mmc_free_host(host->mmc);
mmc_free_host(mmc);
platform_set_drvdata(pdev, NULL);
return 0;

5
include/linux/mmc/host.h
View File

@ -478,6 +478,11 @@ static inline void *mmc_priv(struct mmc_host *host)
return (void *)host->private;
}
static inline struct mmc_host *mmc_from_priv(void *priv)
{
return container_of(priv, struct mmc_host, private);
}
#define mmc_host_is_spi(host) ((host)->caps & MMC_CAP_SPI)
#define mmc_dev(x) ((x)->parent)