mmc: Split mmc struct, rework mmc initialization (v2)

The way that struct mmc was implemented was a bit of a mess;
configuration and internal state all jumbled up in a single structure.

On top of that the way initialization is done with mmc_register leads
to a lot of duplicated code in drivers.

Typically the initialization got something like this in every driver.

	struct mmc *mmc = malloc(sizeof(struct mmc));
	memset(mmc, 0, sizeof(struct mmc);
	/* fill in fields of mmc struct */
	/* store private data pointer */
	mmc_register(mmc);

By using the new mmc_create call one just passes an mmc config struct
and an optional private data pointer like this:

	struct mmc = mmc_create(&cfg, priv);

All in tree drivers have been updated to the new form, and expect
mmc_register to go away before long.

Changes since v1:

* Use calloc instead of manually calling memset.
* Mark mmc_register as deprecated.

Signed-off-by: Pantelis Antoniou <panto@antoniou-consulting.com>

1 files changed, 15 insertions, 20 deletions

diff --git a/drivers/mmc/mxcmmc.c b/drivers/mmc/mxcmmc.c
index 3357559981..561b204598 100644
--- a/drivers/mmc/mxcmmc.c
+++ b/drivers/mmc/mxcmmc.c
@@ -122,6 +122,8 @@ struct mxcmci_host {
 };
 
 static struct mxcmci_host mxcmci_host;
+
+/* maintainer note: do we really want to have a global host pointer? */
 static struct mxcmci_host *host = &mxcmci_host;
 
 static inline int mxcmci_use_dma(struct mxcmci_host *host)
@@ -491,31 +493,24 @@ static const struct mmc_ops mxcmci_ops = {
 	.init		= mxcmci_init,
 };
 
+static struct mmc_config mxcmci_cfg = {
+	.name		= "MXC MCI",
+	.ops		= &mxcmci_ops,
+	.host_caps	= MMC_MODE_4BIT,
+	.voltages	= MMC_VDD_32_33 | MMC_VDD_33_34,
+	.b_max		= CONFIG_SYS_MMC_MAX_BLK_COUNT,
+};
+
 static int mxcmci_initialize(bd_t *bis)
 {
-	struct mmc *mmc = NULL;
-
-	mmc = malloc(sizeof(struct mmc));
-
-	if (!mmc)
-		return -ENOMEM;
-
-	mmc->name = "MXC MCI";
-	mmc->ops = &mxcmci_ops;
-	mmc->host_caps = MMC_MODE_4BIT;
-
 	host->base = (struct mxcmci_regs *)CONFIG_MXC_MCI_REGS_BASE;
-	mmc->priv = host;
-	host->mmc = mmc;
-
-	mmc->voltages = MMC_VDD_32_33 | MMC_VDD_33_34;
-
-	mmc->f_min = mxc_get_clock(MXC_ESDHC_CLK) >> 7;
-	mmc->f_max = mxc_get_clock(MXC_ESDHC_CLK) >> 1;
 
-	mmc->b_max = 0;
+	mxcmci_cfg.f_min = mxc_get_clock(MXC_ESDHC_CLK) >> 7;
+	mxcmci_cfg.f_max = mxc_get_clock(MXC_ESDHC_CLK) >> 1;
 
-	mmc_register(mmc);
+	host->mmc = mmc_create(&mxcmci_cfg, host);
+	if (host->mmc == NULL)
+		return -1;
 
 	return 0;
 }