sdhci: add num index for multi controllers case

Some devices have several controllers; need add the index info to
device slot name host->slot_desc[]
Signed-off-by: Feng Tang <feng.tang@intel.com>
Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>

drivers/mmc/host/sdhci.c

@@ -30,6 +30,10 @@
 
 static unsigned int debug_quirks = 0;
 
+/* For multi controllers in one platform case */
+static u16 chip_index = 0;
+static spinlock_t index_lock;
+
 /*
  * Different quirks to handle when the hardware deviates from a strict
  * interpretation of the SDHCI specification.
@@ -1320,7 +1324,7 @@ static int __devinit sdhci_probe_slot(struct pci_dev *pdev, int slot)
 
 	DBG("slot %d at 0x%08lx, irq %d\n", slot, host->addr, host->irq);
 
-	snprintf(host->slot_descr, 20, "sdhci:slot%d", slot);
+	snprintf(host->slot_descr, 20, "sdhc%d:slot%d", chip->index, slot);
 
 	ret = pci_request_region(pdev, host->bar, host->slot_descr);
 	if (ret)
@@ -1585,6 +1589,11 @@ static int __devinit sdhci_probe(struct pci_dev *pdev,
 	chip->num_slots = slots;
 	pci_set_drvdata(pdev, chip);
 
+	/* Add for multi controller case */
+	spin_lock(&index_lock);
+	chip->index = chip_index++;
+	spin_unlock(&index_lock);
+
 	for (i = 0;i < slots;i++) {
 		ret = sdhci_probe_slot(pdev, i);
 		if (ret) {
@@ -1645,6 +1654,8 @@ static int __init sdhci_drv_init(void)
 		": Secure Digital Host Controller Interface driver\n");
 	printk(KERN_INFO DRIVER_NAME ": Copyright(c) Pierre Ossman\n");
 
+	spin_lock_init(&index_lock);
+
 	return pci_register_driver(&sdhci_driver);
 }
 

drivers/mmc/host/sdhci.h

@@ -208,6 +208,7 @@ struct sdhci_chip {
 
 	unsigned long		quirks;
 
+	int			index;		/* Index for chip0, chip1 ...*/
 	int			num_slots;	/* Slots on controller */
 	struct sdhci_host	*hosts[0];	/* Pointers to hosts */
 };