mmc: atmel: Implement proper private data

Instead of passing just the register area as a private data, introduce
a proper struct atmel_mci_priv structure instead. This will become useful
in the subsequent patch, where we eliminate the global variable from this
driver.

Signed-off-by: Marek Vasut <marex@denx.de>
Reviewed-by: Andreas Bießmann <andreas.devel@googlemail.com>
[fix free()]
Signed-off-by: Andreas Bießmann <andreas.devel@googlemail.com>

drivers/mmc/gen_atmel_mci.c

@@ -32,6 +32,11 @@
 # define MCI_BUS 0
 #endif
 
+struct atmel_mci_priv {
+	struct mmc_config	cfg;
+	struct atmel_mci	*mci;
+};
+
 static int initialized = 0;
 
 /* Read Atmel MCI IP version */
@@ -55,7 +60,8 @@ static void dump_cmd(u32 cmdr, u32 arg, u32 status, const char* msg)
 /* Setup for MCI Clock and Block Size */
 static void mci_set_mode(struct mmc *mmc, u32 hz, u32 blklen)
 {
-	atmel_mci_t *mci = mmc->priv;
+	struct atmel_mci_priv *priv = mmc->priv;
+	atmel_mci_t *mci = priv->mci;
 	u32 bus_hz = get_mci_clk_rate();
 	u32 clkdiv = 255;
 	unsigned int version = atmel_mci_get_version(mci);
@@ -198,7 +204,8 @@ io_fail:
 static int
 mci_send_cmd(struct mmc *mmc, struct mmc_cmd *cmd, struct mmc_data *data)
 {
-	atmel_mci_t *mci = mmc->priv;
+	struct atmel_mci_priv *priv = mmc->priv;
+	atmel_mci_t *mci = priv->mci;
 	u32 cmdr;
 	u32 error_flags = 0;
 	u32 status;
@@ -323,7 +330,8 @@ mci_send_cmd(struct mmc *mmc, struct mmc_cmd *cmd, struct mmc_data *data)
 /* Entered into mmc structure during driver init */
 static void mci_set_ios(struct mmc *mmc)
 {
-	atmel_mci_t *mci = mmc->priv;
+	struct atmel_mci_priv *priv = mmc->priv;
+	atmel_mci_t *mci = priv->mci;
 	int bus_width = mmc->bus_width;
 	unsigned int version = atmel_mci_get_version(mci);
 	int busw;
@@ -359,7 +367,8 @@ static void mci_set_ios(struct mmc *mmc)
 /* Entered into mmc structure during driver init */
 static int mci_init(struct mmc *mmc)
 {
-	atmel_mci_t *mci = mmc->priv;
+	struct atmel_mci_priv *priv = mmc->priv;
+	atmel_mci_t *mci = priv->mci;
 
 	/* Initialize controller */
 	writel(MMCI_BIT(SWRST), &mci->cr);	/* soft reset */
@@ -393,22 +402,23 @@ int atmel_mci_init(void *regs)
 {
 	struct mmc *mmc;
 	struct mmc_config *cfg;
-	struct atmel_mci *mci;
+	struct atmel_mci_priv *priv;
 	unsigned int version;
 
-	cfg = malloc(sizeof(*cfg));
-	if (cfg == NULL)
-		return -1;
-	memset(cfg, 0, sizeof(*cfg));
+	priv = calloc(1, sizeof(*priv));
+	if (!priv)
+		return -ENOMEM;
 
-	mci = (struct atmel_mci *)regs;
+	cfg = &priv->cfg;
 
 	cfg->name = "mci";
 	cfg->ops = &atmel_mci_ops;
 
+	priv->mci = (struct atmel_mci *)regs;
+
 	/* need to be able to pass these in on a board by board basis */
 	cfg->voltages = MMC_VDD_32_33 | MMC_VDD_33_34;
-	version = atmel_mci_get_version(mci);
+	version = atmel_mci_get_version(priv->mci);
 	if ((version & 0xf00) >= 0x300) {
 		cfg->host_caps = MMC_MODE_8BIT;
 		cfg->host_caps |= MMC_MODE_HS | MMC_MODE_HS_52MHz;
@@ -425,13 +435,13 @@ int atmel_mci_init(void *regs)
 
 	cfg->b_max = CONFIG_SYS_MMC_MAX_BLK_COUNT;
 
-	mmc = mmc_create(cfg, regs);
+	mmc = mmc_create(cfg, priv);
 
 	if (mmc == NULL) {
-		free(cfg);
-		return -1;
+		free(priv);
+		return -ENODEV;
 	}
-	/* NOTE: possibly leaking the cfg structure */
+	/* NOTE: possibly leaking the priv structure */
 
 	return 0;
 }