x86/mrst: Add SFI platform device parsing code

SFI provides a series of tables. These describe the platform devices present
including SPI and I²C devices, as well as various sensors, keypads and other
glue as well as interfaces provided via the SCU IPC mechanism (intel_scu_ipc.c)

This patch is a merge of the core elements and relevant fixes from the
Intel development code by Feng, Alek, myself into a single coherent patch
for upstream submission.

It provides the needed infrastructure to register I2C, SPI and platform devices
described by the tables, as well as handlers for some of the hardware already
supported in kernel. The 0.8 firmware also provides GPIO tables.

Devices are created at boot time or if they are SCU dependant at the point an
SCU is discovered. The existing Linux device mechanisms will then handle the
device binding. At an abstract level this is an SFI to Linux device translator.

Device/platform specific setup/glue is in this file. This is done so that the
drivers for the generic I²C and SPI bus devices remain cross platform as they
should.

(Updated from RFC version to correct the emc1403 name used by the firmware
 and a wrongly used #define)
Signed-off-by: Alek Du <alek.du@linux.intel.com>
LKML-Reference: <20101109112158.20013.6158.stgit@localhost.localdomain>
[Clean ups, removal of 0.7 support]
Signed-off-by: Feng Tang <feng.tang@linux.intel.com>
[Clean ups]
Signed-off-by: Alan Cox <alan@linux.intel.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

arch/x86/Kconfig

@@ -385,6 +385,8 @@ config X86_MRST
 	depends on X86_EXTENDED_PLATFORM
 	depends on X86_IO_APIC
 	select APB_TIMER
+	select I2C
+	select SPI
 	---help---
 	  Moorestown is Intel's Low Power Intel Architecture (LPIA) based Moblin
 	  Internet Device(MID) platform. Moorestown consists of two chips:

arch/x86/include/asm/mrst.h

@@ -50,4 +50,8 @@ extern void mrst_early_console_init(void);
 
 extern struct console early_hsu_console;
 extern void hsu_early_console_init(void);
+
+extern void intel_scu_devices_create(void);
+extern void intel_scu_devices_destroy(void);
+
 #endif /* _ASM_X86_MRST_H */

drivers/platform/x86/intel_scu_ipc.c

@@ -26,6 +26,7 @@
 #include <linux/sfi.h>
 #include <asm/mrst.h>
 #include <asm/intel_scu_ipc.h>
+#include <asm/mrst.h>
 
 /* IPC defines the following message types */
 #define IPCMSG_WATCHDOG_TIMER 0xF8 /* Set Kernel Watchdog Threshold */
@@ -699,6 +700,9 @@ static int ipc_probe(struct pci_dev *dev, const struct pci_device_id *id)
 		iounmap(ipcdev.ipc_base);
 		return -ENOMEM;
 	}
+
+	intel_scu_devices_create();
+
 	return 0;
 }
 
@@ -720,6 +724,7 @@ static void ipc_remove(struct pci_dev *pdev)
 	iounmap(ipcdev.ipc_base);
 	iounmap(ipcdev.i2c_base);
 	ipcdev.pdev = NULL;
+	intel_scu_devices_destroy();
 }
 
 static const struct pci_device_id pci_ids[] = {

include/linux/sfi.h

@@ -77,6 +77,8 @@
 #define SFI_OEM_ID_SIZE		6
 #define SFI_OEM_TABLE_ID_SIZE	8
 
+#define SFI_NAME_LEN		16
+
 #define SFI_SYST_SEARCH_BEGIN		0x000E0000
 #define SFI_SYST_SEARCH_END		0x000FFFFF
 
@@ -156,13 +158,13 @@ struct sfi_device_table_entry {
 	u16	addr;
 	u8	irq;
 	u32	max_freq;
-	char	name[16];
+	char	name[SFI_NAME_LEN];
 } __packed;
 
 struct sfi_gpio_table_entry {
-	char	controller_name[16];
+	char	controller_name[SFI_NAME_LEN];
 	u16	pin_no;
-	char	pin_name[16];
+	char	pin_name[SFI_NAME_LEN];
 } __packed;
 
 typedef int (*sfi_table_handler) (struct sfi_table_header *table);