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636752bcb5
linux/drivers/i2c/busses
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Daniel Kurtz 636752bcb5 i2c-i801: Enable IRQ for SMBus transactions 
Add a new 'feature' to i2c-i801 to enable using PCI interrupts.
When the feature is enabled, then an isr is installed for the device's
PCI IRQ.

An I2C/SMBus transaction is always terminated by one of the following
interrupt sources: FAILED, BUS_ERR, DEV_ERR, or on success: INTR.

When the isr fires for one of these cases, it sets the ->status variable
and wakes up the waitq.  The waitq then saves off the status code, and
clears ->status (in preparation for some future transaction).
The SMBus controller generates an INTR irq at the end of each
transaction where INTREN was set in the HST_CNT register.

No locking is needed around accesses to priv->status since all writes to
it are serialized: it is only ever set once in the isr at the end of a
transaction, and cleared while no interrupts can occur.  In addition, the
I2C adapter lock guarantees that entire I2C transactions for a single
adapter are always serialized.

For this patch, the INTREN bit is set only for SMBus block, byte and word
transactions, but not for I2C reads or writes.  The use of the DS
(BYTE_DONE) interrupt with byte-by-byte I2C transactions is implemented in
a subsequent patch.

The interrupt feature has only been enabled for COUGARPOINT hardware.
In addition, it is disabled if SMBus is using the SMI# interrupt.

Signed-off-by: Daniel Kurtz <djkurtz@chromium.org>
Signed-off-by: Jean Delvare <khali@linux-fr.org>
2012-07-24 14:13:58 +02:00
..
i2c-acorn.c Remove all #inclusions of asm/system.h 2012-03-28 18:30:03 +01:00
i2c-ali15x3.c i2c/busses: Use module_pci_driver 2012-07-24 14:13:56 +02:00
i2c-ali1535.c i2c/busses: Use module_pci_driver 2012-07-24 14:13:56 +02:00
i2c-ali1563.c i2c/busses: Use module_pci_driver 2012-07-24 14:13:56 +02:00
i2c-amd756-s4882.c
i2c-amd756.c i2c/busses: Use module_pci_driver 2012-07-24 14:13:56 +02:00
i2c-amd8111.c i2c/busses: Use module_pci_driver 2012-07-24 14:13:56 +02:00
i2c-at91.c i2c/busses: Use module_platform_driver() 2012-01-12 20:32:04 +01:00
i2c-au1550.c i2c/busses: Use module_platform_driver() 2012-01-12 20:32:04 +01:00
i2c-bfin-twi.c i2c: irq: Remove IRQF_DISABLED 2011-10-29 09:55:45 +01:00
i2c-cpm.c i2c/busses: Use module_platform_driver() 2012-01-12 20:32:04 +01:00
i2c-davinci.c i2c: davinci: Free requested IRQ in remove 2012-05-12 20:36:24 +02:00
i2c-designware-core.c i2c: designware: Add support for 16bit register access 2012-05-12 14:28:11 +02:00
i2c-designware-core.h i2c: designware: Add support for 16bit register access 2012-05-12 14:28:11 +02:00
i2c-designware-pcidrv.c i2c/busses: Use module_pci_driver 2012-07-24 14:13:56 +02:00
i2c-designware-platdrv.c i2c: designware: Add clk_{un}prepare() support 2012-05-12 14:28:15 +02:00
i2c-diolan-u2c.c i2c: Update Guenter Roeck's e-mail address 2012-07-24 14:13:56 +02:00
i2c-eg20t.c i2c/busses: Use module_pci_driver 2012-07-24 14:13:56 +02:00
i2c-elektor.c Fix common misspellings 2011-03-31 11:26:23 -03:00
i2c-gpio.c i2c: Dynamically assign adapter id if it wasn't explictly specified 2012-05-12 14:28:11 +02:00
i2c-highlander.c Autogenerated GPG tag for Rusty D1ADB8F1: 15EE 8D6C AB0E 7F0C F999 BFCB D920 0E6C D1AD B8F1 2012-01-14 12:32:16 -08:00
i2c-hydra.c i2c/busses: Use module_pci_driver 2012-07-24 14:13:56 +02:00
i2c-i801.c i2c-i801: Enable IRQ for SMBus transactions 2012-07-24 14:13:58 +02:00
i2c-ibm_iic.c Autogenerated GPG tag for Rusty D1ADB8F1: 15EE 8D6C AB0E 7F0C F999 BFCB D920 0E6C D1AD B8F1 2012-01-14 12:32:16 -08:00
i2c-ibm_iic.h
i2c-imx.c i2c: imx: remove unneeded mach/irqs.h inclusion 2012-07-01 21:58:27 +08:00
i2c-intel-mid.c i2c/busses: Use module_pci_driver 2012-07-24 14:13:56 +02:00
i2c-iop3xx.c i2c/busses: Use module_platform_driver() 2012-01-12 20:32:04 +01:00
i2c-iop3xx.h i2c-iop3xx: add iomem annotation 2011-01-04 00:53:37 +00:00
i2c-isch.c i2c-isch: Decrease delay in command completion check loop 2012-03-26 21:47:18 +02:00
i2c-mpc.c i2c-mpc: avoid I2C abnormal after resuming from deep sleep 2012-05-12 14:28:12 +02:00
i2c-mv64xxx.c i2c/busses: Use module_platform_driver() 2012-01-12 20:32:04 +01:00
i2c-mxs.c arm-soc: device tree conversions, part 2 2012-05-26 12:57:47 -07:00
i2c-nforce2-s4985.c
i2c-nforce2.c i2c/busses: Use module_pci_driver 2012-07-24 14:13:56 +02:00
i2c-nomadik.c ARM: ux500: Remove unused i2c platform_data initialisation code 2012-07-13 09:55:44 +02:00
i2c-nuc900.c i2c: Split I2C_M_NOSTART support out of I2C_FUNC_PROTOCOL_MANGLING 2012-05-30 10:55:34 +02:00
i2c-ocores.c i2c: ocores: register OF i2c devices 2012-05-12 16:49:54 +02:00
i2c-octeon.c i2c/busses: Use module_platform_driver() 2012-01-12 20:32:04 +01:00
i2c-omap.c i2c: OMAP: Fix OMAP1 build error 2012-01-20 08:24:22 -08:00
i2c-parport-light.c i2c-parport: Various cleanups 2011-05-24 20:58:49 +02:00
i2c-parport.c i2c-parport: Various cleanups 2011-05-24 20:58:49 +02:00
i2c-parport.h i2c-parport: Various cleanups 2011-05-24 20:58:49 +02:00
i2c-pasemi.c i2c/busses: Use module_pci_driver 2012-07-24 14:13:56 +02:00
i2c-pca-isa.c i2c-pca: Fix waitforcompletion() return value 2010-09-30 14:14:22 +02:00
i2c-pca-platform.c i2c: Dynamically assign adapter id if it wasn't explictly specified 2012-05-12 14:28:11 +02:00
i2c-piix4.c i2c-piix4: Support AMD auxiliary SMBus controller 2012-07-24 14:13:57 +02:00
i2c-pmcmsp.c i2c/busses: Use module_platform_driver() 2012-01-12 20:32:04 +01:00
i2c-pnx.c i2c: pnx: add device tree support 2012-05-12 14:28:14 +02:00
i2c-powermac.c i2c/powermac: Improve detection of devices from device-tree 2012-07-11 18:22:46 +10:00
i2c-puv3.c i2c-puv3: using module_platform_driver() 2012-01-10 10:29:41 +08:00
i2c-pxa-pci.c i2c/busses: Use module_pci_driver 2012-07-24 14:13:56 +02:00
i2c-pxa.c i2c-pxa: Drop leftover comment 2012-05-12 14:28:11 +02:00
i2c-s3c2410.c i2c: Split I2C_M_NOSTART support out of I2C_FUNC_PROTOCOL_MANGLING 2012-05-30 10:55:34 +02:00
i2c-s6000.c i2c: Change mail address of Oskar Schirmer 2012-05-17 15:15:56 +02:00
i2c-s6000.h i2c: Change mail address of Oskar Schirmer 2012-05-17 15:15:56 +02:00
i2c-scmi.c
i2c-sh7760.c i2c/busses: Use module_platform_driver() 2012-01-12 20:32:04 +01:00
i2c-sh_mobile.c i2c: sh_mobile: add device tree support 2012-05-12 14:28:12 +02:00
i2c-sibyte.c i2c/mips: Fix error return codes from Sibyte i2c bus driver 2010-07-10 09:42:47 +02:00
i2c-simtec.c i2c/busses: Use module_platform_driver() 2012-01-12 20:32:04 +01:00
i2c-sirf.c i2c: add CSR SiRFprimaII on-chip I2C controllers driver 2012-03-07 19:05:04 +01:00
i2c-sis96x.c i2c/busses: Use module_pci_driver 2012-07-24 14:13:56 +02:00
i2c-sis630.c i2c/busses: Use module_pci_driver 2012-07-24 14:13:56 +02:00
i2c-sis5595.c i2c: Convert to DEFINE_PCI_DEVICE_TABLE 2012-01-12 20:32:04 +01:00
i2c-stu300.c i2c: irq: Remove IRQF_DISABLED 2011-10-29 09:55:45 +01:00
i2c-stub.c i2c-stub: Expose the default functionality flags 2010-05-21 18:40:56 +02:00
i2c-taos-evm.c i2c-taos-evm: Fix log messages 2011-06-29 11:36:10 +02:00
i2c-tegra.c i2c: tegra: Add clk_prepare/clk_unprepare 2012-06-11 11:53:35 -06:00
i2c-tiny-usb.c USB: convert some miscellanies drivers to use module_usb_driver() 2011-11-18 09:52:10 -08:00
i2c-versatile.c i2c: Dynamically assign adapter id if it wasn't explictly specified 2012-05-12 14:28:11 +02:00
i2c-via.c i2c/busses: Use module_pci_driver 2012-07-24 14:13:56 +02:00
i2c-viapro.c Autogenerated GPG tag for Rusty D1ADB8F1: 15EE 8D6C AB0E 7F0C F999 BFCB D920 0E6C D1AD B8F1 2012-01-14 12:32:16 -08:00
i2c-xiic.c I2C: xiic: Add OF binding support 2012-05-12 14:28:18 +02:00
i2c-xlr.c i2c: Support for Netlogic XLR/XLS I2C controller. 2012-02-24 22:25:57 +01:00
Kconfig i2c-piix4: Support AMD auxiliary SMBus controller 2012-07-24 14:13:57 +02:00
Makefile i2c: ixp2000: remove driver 2012-05-12 14:28:14 +02:00
scx200_acb.c i2c: Convert to DEFINE_PCI_DEVICE_TABLE 2012-01-12 20:32:04 +01:00
scx200_i2c.c i2c: Use <linux/io.h> instead of <asm/io.h> 2010-05-21 18:41:01 +02:00