x86/sfi: Enable enumeration of SD devices

SFI specification v0.8.2 defines type of devices which are connected to
SD bus. In particularly WiFi dongle is a such.

Add a callback to enumerate the devices connected to SD bus.

Signed-off-by: Andy Shevchenko <[e-mail]>
Cc: Bjorn Helgaas <[e-mail]>
Cc: Linus Torvalds <[e-mail]>
Cc: Peter Zijlstra <[e-mail]>
Cc: Thomas Gleixner <[e-mail]>
Link: http://lkml.kernel.org/r/[e-mail]
Signed-off-by: Ingo Molnar <[e-mail]>

arch/x86/include/asm/intel-mid.h

···
 	static const struct devs_id *const __intel_mid_sfi_##i##_dev __used	\
 	__attribute__((__section__(".x86_intel_mid_dev.init"))) = &i
 
+/**
+* struct mid_sd_board_info - template for SD device creation
+* @name:		identifies the driver
+* @bus_num:		board-specific identifier for a given SD controller
+* @max_clk:		the maximum frequency device supports
+* @platform_data:	the particular data stored there is driver-specific
+*/
+struct mid_sd_board_info {
+	char		name[SFI_NAME_LEN];
+	int		bus_num;
+	unsigned short	addr;
+	u32		max_clk;
+	void		*platform_data;
+};
+
 /*
  * Medfield is the follow-up of Moorestown, it combines two chip solution into
  * one. Other than that it also added always-on and constant tsc and lapic

arch/x86/platform/intel-mid/sfi.c

···
 		i2c_register_board_info(pentry->host_num, &i2c_info, 1);
 }
 
+static void __init sfi_handle_sd_dev(struct sfi_device_table_entry *pentry,
+					struct devs_id *dev)
+{
+	struct mid_sd_board_info sd_info;
+	void *pdata;
+
+	memset(&sd_info, 0, sizeof(sd_info));
+	strncpy(sd_info.name, pentry->name, SFI_NAME_LEN);
+	sd_info.bus_num = pentry->host_num;
+	sd_info.max_clk = pentry->max_freq;
+	sd_info.addr = pentry->addr;
+	pr_debug("SD bus = %d, name = %16.16s, max_clk = %d, addr = 0x%x\n",
+		 sd_info.bus_num,
+		 sd_info.name,
+		 sd_info.max_clk,
+		 sd_info.addr);
+	pdata = intel_mid_sfi_get_pdata(dev, &sd_info);
+	if (IS_ERR(pdata))
+		return;
+
+	/* Nothing we can do with this for now */
+	sd_info.platform_data = pdata;
+
+	pr_debug("Successfully registered %16.16s", sd_info.name);
+}
+
 extern struct devs_id *const __x86_intel_mid_dev_start[],
 		      *const __x86_intel_mid_dev_end[];
 
···
 				break;
 			case SFI_DEV_TYPE_I2C:
 				sfi_handle_i2c_dev(pentry, dev);
+				break;
+			case SFI_DEV_TYPE_SD:
+				sfi_handle_sd_dev(pentry, dev);
 				break;
 			case SFI_DEV_TYPE_UART:
 			case SFI_DEV_TYPE_HSI:

include/linux/sfi.h

···
 #define SFI_DEV_TYPE_UART	2
 #define SFI_DEV_TYPE_HSI	3
 #define SFI_DEV_TYPE_IPC	4
+#define SFI_DEV_TYPE_SD		5
 
 	u8	host_num;	/* attached to host 0, 1...*/
 	u16	addr;