sdhci: add support for the SysKonnect CardBus2SDIO adapter

This is still in use especially to develop SDIO device drivers on laptop
machines which are lacking SDIO slots.  This adapter supports SDIO cards
only due to lack of 136-bit response capability.

Signed-off-by: Nicolas Pitre <nico@marvell.com>
Cc: <linux-mmc@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

drivers/mmc/host/sdhci-pci.c

@@ -285,6 +285,73 @@ static const struct sdhci_pci_fixes sdhci_jmicron = {
 	.resume		= jmicron_resume,
 };
 
+/* SysKonnect CardBus2SDIO extra registers */
+#define SYSKT_CTRL		0x200
+#define SYSKT_RDFIFO_STAT	0x204
+#define SYSKT_WRFIFO_STAT	0x208
+#define SYSKT_POWER_DATA	0x20c
+#define   SYSKT_POWER_330	0xef
+#define   SYSKT_POWER_300	0xf8
+#define   SYSKT_POWER_184	0xcc
+#define SYSKT_POWER_CMD		0x20d
+#define   SYSKT_POWER_START	(1 << 7)
+#define SYSKT_POWER_STATUS	0x20e
+#define   SYSKT_POWER_STATUS_OK	(1 << 0)
+#define SYSKT_BOARD_REV		0x210
+#define SYSKT_CHIP_REV		0x211
+#define SYSKT_CONF_DATA		0x212
+#define   SYSKT_CONF_DATA_1V8	(1 << 2)
+#define   SYSKT_CONF_DATA_2V5	(1 << 1)
+#define   SYSKT_CONF_DATA_3V3	(1 << 0)
+
+static int syskt_probe(struct sdhci_pci_chip *chip)
+{
+	if ((chip->pdev->class & 0x0000FF) == PCI_SDHCI_IFVENDOR) {
+		chip->pdev->class &= ~0x0000FF;
+		chip->pdev->class |= PCI_SDHCI_IFDMA;
+	}
+	return 0;
+}
+
+static int syskt_probe_slot(struct sdhci_pci_slot *slot)
+{
+	int tm, ps;
+
+	u8 board_rev = readb(slot->host->ioaddr + SYSKT_BOARD_REV);
+	u8  chip_rev = readb(slot->host->ioaddr + SYSKT_CHIP_REV);
+	dev_info(&slot->chip->pdev->dev, "SysKonnect CardBus2SDIO, "
+					 "board rev %d.%d, chip rev %d.%d\n",
+					 board_rev >> 4, board_rev & 0xf,
+					 chip_rev >> 4,  chip_rev & 0xf);
+	if (chip_rev >= 0x20)
+		slot->host->quirks |= SDHCI_QUIRK_FORCE_DMA;
+
+	writeb(SYSKT_POWER_330, slot->host->ioaddr + SYSKT_POWER_DATA);
+	writeb(SYSKT_POWER_START, slot->host->ioaddr + SYSKT_POWER_CMD);
+	udelay(50);
+	tm = 10;  /* Wait max 1 ms */
+	do {
+		ps = readw(slot->host->ioaddr + SYSKT_POWER_STATUS);
+		if (ps & SYSKT_POWER_STATUS_OK)
+			break;
+		udelay(100);
+	} while (--tm);
+	if (!tm) {
+		dev_err(&slot->chip->pdev->dev,
+			"power regulator never stabilized");
+		writeb(0, slot->host->ioaddr + SYSKT_POWER_CMD);
+		return -ENODEV;
+	}
+
+	return 0;
+}
+
+static const struct sdhci_pci_fixes sdhci_syskt = {
+	.quirks		= SDHCI_QUIRK_NO_SIMULT_VDD_AND_POWER,
+	.probe		= syskt_probe,
+	.probe_slot	= syskt_probe_slot,
+};
+
 static int via_probe(struct sdhci_pci_chip *chip)
 {
 	if (chip->pdev->revision == 0x10)
@@ -362,6 +429,14 @@ static const struct pci_device_id pci_ids[] __devinitdata = {
 		.driver_data	= (kernel_ulong_t)&sdhci_jmicron,
 	},
 
+	{
+		.vendor		= PCI_VENDOR_ID_SYSKONNECT,
+		.device		= 0x8000,
+		.subvendor	= PCI_ANY_ID,
+		.subdevice	= PCI_ANY_ID,
+		.driver_data	= (kernel_ulong_t)&sdhci_syskt,
+	},
+
 	{
 		.vendor		= PCI_VENDOR_ID_VIA,
 		.device		= 0x95d0,