[v17] i2c: Add drivers for the AMD PCIe MP2 I2C controller

MP2 controllers have two separate busses, so may accommodate up to two I2C
adapters. Those adapters are listed in the ACPI namespace with the
"AMDI0011" HID, and probed by a platform driver.

Communication with the MP2 takes place through MMIO registers, or through
DMA for more than 32 bytes transfers.

This is major rework of the patch submitted by Nehal-bakulchandra Shah from
AMD (https://patchwork.kernel.org/patch/10597369/).

Most of the event handling of v3 was rewritten to make it work with more
than one bus (e.g on Ryzen-based Lenovo Yoga 530), and this version
contains many other improvements.

Signed-off-by: Elie Morisse <syniurge@gmail.com>
---
Changes since v1 (https://www.spinics.net/lists/linux-i2c/msg34650.html):
-> Add fix for IOMMU
-> Add dependency of ACPI
-> Add locks to avoid the crash

Changes since v2 (https://patchwork.ozlabs.org/patch/961270/):

-> fix for review comments
-> fix for more than 32 bytes write issue

Changes since v3 (https://patchwork.kernel.org/patch/10597369/) by Elie M.:

-> support more than one bus/adapter
-> support more than one slave per bus
-> use the bus speed specified by the slaves declared in the DSDT instead of
   assuming speed == 400kbits/s
-> instead of kzalloc'ing a buffer for every less than 32 bytes reads, simply
   use i2c_msg.buf
-> fix buffer overreads/overflows when (<=32 bytes) message lengths aren't a
   multiple of 4 by using memcpy_fromio and memcpy_toio
-> use streaming DMA mappings instead of allocating a coherent DMA buffer for
   every >32 bytes read/write
-> properly check for timeouts during i2c_amd_xfer and increase it from 50
   jiffies to 250 msecs (which is more in line with other drivers)
-> complete amd_i2c_dev.msg even if the device doesn't return a xxx_success
   event, instead of stalling i2c_amd_xfer
-> removed the spinlock and mdelay during i2c_amd_pci_configure, I didn't see
   the point since it's already waiting for a i2c_busenable_complete event
-> add an adapter-specific mutex lock for i2c_amd_xfer, since we don't want
   parallel calls writing to AMD_C2P_MSG0 (or AMD_C2P_MSG1)
-> add a global mutex lock for registers AMD_C2P_MSG2 to AMD_C2P_MSG9,  which
   are shared across the two busses/adapters
-> add MODULE_DEVICE_TABLE to automatically load i2c-amd-platdrv if the DSDT
   enumerates devices with the "AMDI0011" HID
-> set maximum length of reads/writes to 4095 (event's length field is 12 bits)
-> basic PM support
-> style corrections to match the kernel code style, and tried to reduce code
   duplication whenever possible

Changes since v4 by Elie M.:

-> fix missing typecast warning
-> removed the duplicated entry in Kconfig

Changes since v5 by Elie M.:

-> move DMA mapping from the platform driver to the PCI driver
-> attempt to find the platform device's PCI parent through the _DEP ACPI method
   (if not found take the first MP2 device registred in the i2c-amd-pci-mp2
   driver, like before)
-> do not assume anymore that the PCI device is owned by the i2c-amd-pci-mp2
   driver
-> address other review comments by Bjorn Helgaas (meant for v3)

Changes since v6 by Elie M.:

-> remove unnecessary memcpy from the DMA buffer during i2c_amd_read_completion

Changes since v7 by Elie M.:

-> merge the two modules into one named i2c-amd-mp2, delete now useless exports
-> unlock the C2P mutex if i2c_amd_xfer_msg timeouts, to prevent stalling the
   MP2 controller if a slave doesn't respond to a read or write request
-> unmap the DMA buffer before read/write_complete
-> fix bus_disable commands handling (no more errors during module exit)
-> prefer managed versions of pci_ and dev_ functions whenever possible
-> increase adapter retries from 0 to 3
-> reduce code duplication in debugfs functions
-> address other review points by Bjorn Helgaas (except regarding the _DEP
   hint)

Changes since v8 by Elie M.:

-> remove mostly redundant amd_i2c_rw_config, refer to i2c_msg whenever
possible
-> use i2c_get_dma_safe_msg_buf and i2c_put_dma_safe_msg_buf
-> defer probe() by the platform driver if no MP2 device has been probed
yet by the PCI driver (which should address Bjorn Helgaas' concern while
preserving the platform driver)
-> if the interrupt following a command doesn't get handled after 250ms,
zero AMD_P2C_MSG_INTEN to prevent the MP2 from stalling for a few more
seconds
-> include AMD_P2C_MSG3 and fix typo in debugfs output
-> cosmetic fixes, code reduction, and better comments
-> add Nehal Shah and Shyam Sundar S K from AMD to the list of maintainers

Changes since v9 by Elie M.:

-> remove the xfer_lock mutex which was redundant with i2c_adapter.bus_lock
-> platform device remove() fixes (protection against the very unlikely
case that both the PCI and platform devices get detached manually and
simultaneously)
-> fix manually unbinding the PCI device and then rebinding, there was an
interrupt that wouldn't get serviced and thus the line got disabled
-> look for the MP2 device corresponding to an AMDI0011 ACPI device in
every device enumerated by _DEP, not just the first one
-> set i2c_adapter.nr to pdev->id and call i2c_add_numbered_adapter()
-> add Documentation/i2c/busses/ entry
-> minor enhancements

Changes since v10 by Elie M.:

-> runtime PM support
-> synchronisation fixes for <=32 bytes reads/writes through C2P registers,
no more timeouts or "irq: nobody cared" errors on Lenovo Ideapad 530s
-> remove the isr spinlock, not needed since isr aren't re-entrant
-> remove the delayed_work field, make the isr complete .cmd_complete
directly
-> xfer now returns -EIO if the MP2 response isn't the expected one
-> check that the adapter still exists at the beginning of xfer
-> less code duplication in amd_mp2_read/write
-> better names (bus_xnable => bus_enable_set, _msg => _cmd) and other
minor enhancements

Changes since v11 by Elie M.:

-> remove the ACPI _DEP hint, Nehal from AMD said that there's no plan to
have more than one MP2 device per system and this wasn't _DEP's purpose
-> use device links between the two drivers to simplify the .remove logic
-> do not hardcode the i2c adapter timeout
-> code reduction and comment fixes

Changes since v12 by Elie M.:

-> fix the two warnings by the kbuild test bot

Changes since v13 by Elie M., requested by Nehal Shah from AMD:

-> split the i2c-amd-mp2 module back into two, i2c-amd-mp2-pci and
i2c-amd-mp2-plat
-> move DMA mapping back into the platform driver

Changes since v14 by Elie M.:

-> fix build failure if CONFIG_PM isn't defined

Changes since v15 by Elie M.:

-> changes requested by Wolfram Sang in his v15 review

Changes since v16 by Elie M.:

-> ensure that writeq gets defined
-> fix the device name in Documentation/ to match the entry at pci-ids (https://pci-ids.ucw.cz/read/PC/1022/15e6)
-> remove the unused DRIVER_xxx defines (forgot to remove them in v16)

 Documentation/i2c/busses/i2c-amd-mp2  |  23 ++
 MAINTAINERS                           |   8 +
 drivers/i2c/busses/Kconfig            |  10 +
 drivers/i2c/busses/Makefile           |   1 +
 drivers/i2c/busses/i2c-amd-mp2-pci.c  | 483 ++++++++++++++++++++++++++
 drivers/i2c/busses/i2c-amd-mp2-plat.c | 367 +++++++++++++++++++
 drivers/i2c/busses/i2c-amd-mp2.h      | 219 ++++++++++++
 7 files changed, 1111 insertions(+)
 create mode 100644 Documentation/i2c/busses/i2c-amd-mp2
 create mode 100644 drivers/i2c/busses/i2c-amd-mp2-pci.c
 create mode 100644 drivers/i2c/busses/i2c-amd-mp2-plat.c
 create mode 100644 drivers/i2c/busses/i2c-amd-mp2.h

Hi Elie,

On 3/5/2019 8:43 PM, Elie Morisse wrote:
> MP2 controllers have two separate busses, so may accommodate up to two I2C
> adapters. Those adapters are listed in the ACPI namespace with the
> "AMDI0011" HID, and probed by a platform driver.
> 
> Communication with the MP2 takes place through MMIO registers, or through
> DMA for more than 32 bytes transfers.
> 
> This is major rework of the patch submitted by Nehal-bakulchandra Shah from
> AMD (https://patchwork.kernel.org/patch/10597369/).
> 
> Most of the event handling of v3 was rewritten to make it work with more
> than one bus (e.g on Ryzen-based Lenovo Yoga 530), and this version
> contains many other improvements.
> 
> Signed-off-by: Elie Morisse <syniurge@gmail.com>
> ---
> Changes since v1 (https://www.spinics.net/lists/linux-i2c/msg34650.html):
> -> Add fix for IOMMU
> -> Add dependency of ACPI
> -> Add locks to avoid the crash
> 
> Changes since v2 (https://patchwork.ozlabs.org/patch/961270/):
> 
> -> fix for review comments
> -> fix for more than 32 bytes write issue
> 
> Changes since v3 (https://patchwork.kernel.org/patch/10597369/) by Elie M.:
> 
> -> support more than one bus/adapter
> -> support more than one slave per bus
> -> use the bus speed specified by the slaves declared in the DSDT instead of
>    assuming speed == 400kbits/s
> -> instead of kzalloc'ing a buffer for every less than 32 bytes reads, simply
>    use i2c_msg.buf
> -> fix buffer overreads/overflows when (<=32 bytes) message lengths aren't a
>    multiple of 4 by using memcpy_fromio and memcpy_toio
> -> use streaming DMA mappings instead of allocating a coherent DMA buffer for
>    every >32 bytes read/write
> -> properly check for timeouts during i2c_amd_xfer and increase it from 50
>    jiffies to 250 msecs (which is more in line with other drivers)
> -> complete amd_i2c_dev.msg even if the device doesn't return a xxx_success
>    event, instead of stalling i2c_amd_xfer
> -> removed the spinlock and mdelay during i2c_amd_pci_configure, I didn't see
>    the point since it's already waiting for a i2c_busenable_complete event
> -> add an adapter-specific mutex lock for i2c_amd_xfer, since we don't want
>    parallel calls writing to AMD_C2P_MSG0 (or AMD_C2P_MSG1)
> -> add a global mutex lock for registers AMD_C2P_MSG2 to AMD_C2P_MSG9,  which
>    are shared across the two busses/adapters
> -> add MODULE_DEVICE_TABLE to automatically load i2c-amd-platdrv if the DSDT
>    enumerates devices with the "AMDI0011" HID
> -> set maximum length of reads/writes to 4095 (event's length field is 12 bits)
> -> basic PM support
> -> style corrections to match the kernel code style, and tried to reduce code
>    duplication whenever possible
> 
> Changes since v4 by Elie M.:
> 
> -> fix missing typecast warning
> -> removed the duplicated entry in Kconfig
> 
> Changes since v5 by Elie M.:
> 
> -> move DMA mapping from the platform driver to the PCI driver
> -> attempt to find the platform device's PCI parent through the _DEP ACPI method
>    (if not found take the first MP2 device registred in the i2c-amd-pci-mp2
>    driver, like before)
> -> do not assume anymore that the PCI device is owned by the i2c-amd-pci-mp2
>    driver
> -> address other review comments by Bjorn Helgaas (meant for v3)
> 
> Changes since v6 by Elie M.:
> 
> -> remove unnecessary memcpy from the DMA buffer during i2c_amd_read_completion
> 
> Changes since v7 by Elie M.:
> 
> -> merge the two modules into one named i2c-amd-mp2, delete now useless exports
> -> unlock the C2P mutex if i2c_amd_xfer_msg timeouts, to prevent stalling the
>    MP2 controller if a slave doesn't respond to a read or write request
> -> unmap the DMA buffer before read/write_complete
> -> fix bus_disable commands handling (no more errors during module exit)
> -> prefer managed versions of pci_ and dev_ functions whenever possible
> -> increase adapter retries from 0 to 3
> -> reduce code duplication in debugfs functions
> -> address other review points by Bjorn Helgaas (except regarding the _DEP
>    hint)
> 
> Changes since v8 by Elie M.:
> 
> -> remove mostly redundant amd_i2c_rw_config, refer to i2c_msg whenever
> possible
> -> use i2c_get_dma_safe_msg_buf and i2c_put_dma_safe_msg_buf
> -> defer probe() by the platform driver if no MP2 device has been probed
> yet by the PCI driver (which should address Bjorn Helgaas' concern while
> preserving the platform driver)
> -> if the interrupt following a command doesn't get handled after 250ms,
> zero AMD_P2C_MSG_INTEN to prevent the MP2 from stalling for a few more
> seconds
> -> include AMD_P2C_MSG3 and fix typo in debugfs output
> -> cosmetic fixes, code reduction, and better comments
> -> add Nehal Shah and Shyam Sundar S K from AMD to the list of maintainers
> 
> Changes since v9 by Elie M.:
> 
> -> remove the xfer_lock mutex which was redundant with i2c_adapter.bus_lock
> -> platform device remove() fixes (protection against the very unlikely
> case that both the PCI and platform devices get detached manually and
> simultaneously)
> -> fix manually unbinding the PCI device and then rebinding, there was an
> interrupt that wouldn't get serviced and thus the line got disabled
> -> look for the MP2 device corresponding to an AMDI0011 ACPI device in
> every device enumerated by _DEP, not just the first one
> -> set i2c_adapter.nr to pdev->id and call i2c_add_numbered_adapter()
> -> add Documentation/i2c/busses/ entry
> -> minor enhancements
> 
> Changes since v10 by Elie M.:
> 
> -> runtime PM support
> -> synchronisation fixes for <=32 bytes reads/writes through C2P registers,
> no more timeouts or "irq: nobody cared" errors on Lenovo Ideapad 530s
> -> remove the isr spinlock, not needed since isr aren't re-entrant
> -> remove the delayed_work field, make the isr complete .cmd_complete
> directly
> -> xfer now returns -EIO if the MP2 response isn't the expected one
> -> check that the adapter still exists at the beginning of xfer
> -> less code duplication in amd_mp2_read/write
> -> better names (bus_xnable => bus_enable_set, _msg => _cmd) and other
> minor enhancements
> 
> Changes since v11 by Elie M.:
> 
> -> remove the ACPI _DEP hint, Nehal from AMD said that there's no plan to
> have more than one MP2 device per system and this wasn't _DEP's purpose
> -> use device links between the two drivers to simplify the .remove logic
> -> do not hardcode the i2c adapter timeout
> -> code reduction and comment fixes
> 
> Changes since v12 by Elie M.:
> 
> -> fix the two warnings by the kbuild test bot
> 
> Changes since v13 by Elie M., requested by Nehal Shah from AMD:
> 
> -> split the i2c-amd-mp2 module back into two, i2c-amd-mp2-pci and
> i2c-amd-mp2-plat
> -> move DMA mapping back into the platform driver
> 
> Changes since v14 by Elie M.:
> 
> -> fix build failure if CONFIG_PM isn't defined
> 
> Changes since v15 by Elie M.:
> 
> -> changes requested by Wolfram Sang in his v15 review
> 
> Changes since v16 by Elie M.:
> 
> -> ensure that writeq gets defined
> -> fix the device name in Documentation/ to match the entry at pci-ids (https://pci-ids.ucw.cz/read/PC/1022/15e6)
> -> remove the unused DRIVER_xxx defines (forgot to remove them in v16)
> 
>  Documentation/i2c/busses/i2c-amd-mp2  |  23 ++
>  MAINTAINERS                           |   8 +
>  drivers/i2c/busses/Kconfig            |  10 +
>  drivers/i2c/busses/Makefile           |   1 +
>  drivers/i2c/busses/i2c-amd-mp2-pci.c  | 483 ++++++++++++++++++++++++++
>  drivers/i2c/busses/i2c-amd-mp2-plat.c | 367 +++++++++++++++++++
>  drivers/i2c/busses/i2c-amd-mp2.h      | 219 ++++++++++++
>  7 files changed, 1111 insertions(+)
>  create mode 100644 Documentation/i2c/busses/i2c-amd-mp2
>  create mode 100644 drivers/i2c/busses/i2c-amd-mp2-pci.c
>  create mode 100644 drivers/i2c/busses/i2c-amd-mp2-plat.c
>  create mode 100644 drivers/i2c/busses/i2c-amd-mp2.h
> 
> diff --git a/Documentation/i2c/busses/i2c-amd-mp2 b/Documentation/i2c/busses/i2c-amd-mp2
> new file mode 100644
> index 000000000000..6571487171f4
> --- /dev/null
> +++ b/Documentation/i2c/busses/i2c-amd-mp2
> @@ -0,0 +1,23 @@
> +Kernel driver i2c-amd-mp2
> +
> +Supported adapters:
> +  * AMD MP2 PCIe interface
> +
> +Datasheet: not publicly available.
> +
> +Authors:
> +	Shyam Sundar S K <Shyam-sundar.S-k@amd.com>
> +	Nehal Shah <nehal-bakulchandra.shah@amd.com>
> +	Elie Morisse <syniurge@gmail.com>
> +
> +Description
> +-----------
> +
> +The MP2 is an ARM processor programmed as an I2C controller and communicating
> +with the x86 host through PCI.
> +
> +If you see something like this:
> +
> +03:00.7 MP2 I2C controller: Advanced Micro Devices, Inc. [AMD] Device 15e6
> +
> +in your 'lspci -v', then this driver is for your device.
> diff --git a/MAINTAINERS b/MAINTAINERS
> index d27401df091f..76f8b3c40132 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -808,6 +808,14 @@ F:	drivers/gpu/drm/amd/include/vi_structs.h
>  F:	drivers/gpu/drm/amd/include/v9_structs.h
>  F:	include/uapi/linux/kfd_ioctl.h
>  
> +AMD MP2 I2C DRIVER
> +M:	Elie Morisse <syniurge@gmail.com>
> +M:	Nehal Shah <nehal-bakulchandra.shah@amd.com>
> +M:	Shyam Sundar S K <shyam-sundar.s-k@amd.com>
> +L:	linux-i2c@vger.kernel.org
> +S:	Maintained
> +F:	drivers/i2c/busses/i2c-amd-mp2*
> +
>  AMD POWERPLAY
>  M:	Rex Zhu <rex.zhu@amd.com>
>  M:	Evan Quan <evan.quan@amd.com>
> diff --git a/drivers/i2c/busses/Kconfig b/drivers/i2c/busses/Kconfig
> index f2c681971201..c97478e65102 100644
> --- a/drivers/i2c/busses/Kconfig
> +++ b/drivers/i2c/busses/Kconfig
> @@ -77,6 +77,16 @@ config I2C_AMD8111
>  	  This driver can also be built as a module.  If so, the module
>  	  will be called i2c-amd8111.
>  
> +config I2C_AMD_MP2
> +	tristate "AMD MP2 PCIe"
> +	depends on PCI && ACPI
> +	help
> +	  If you say yes to this option, support will be included for the AMD
> +	  MP2 PCIe I2C adapter.
> +
> +	  This driver can also be built as modules.  If so, the modules will
> +	  be called i2c-amd-mp2-pci and i2c-amd-mp2-plat.
> +
>  config I2C_HIX5HD2
>  	tristate "Hix5hd2 high-speed I2C driver"
>  	depends on ARCH_HISI || ARCH_HIX5HD2 || COMPILE_TEST
> diff --git a/drivers/i2c/busses/Makefile b/drivers/i2c/busses/Makefile
> index 5f0cb6915969..2e98a6618ce5 100644
> --- a/drivers/i2c/busses/Makefile
> +++ b/drivers/i2c/busses/Makefile
> @@ -33,6 +33,7 @@ obj-$(CONFIG_I2C_POWERMAC)	+= i2c-powermac.o
>  
>  # Embedded system I2C/SMBus host controller drivers
>  obj-$(CONFIG_I2C_ALTERA)	+= i2c-altera.o
> +obj-$(CONFIG_I2C_AMD_MP2)	+= i2c-amd-mp2-pci.o i2c-amd-mp2-plat.o
>  obj-$(CONFIG_I2C_ASPEED)	+= i2c-aspeed.o
>  obj-$(CONFIG_I2C_AT91)		+= i2c-at91.o
>  obj-$(CONFIG_I2C_AU1550)	+= i2c-au1550.o
> diff --git a/drivers/i2c/busses/i2c-amd-mp2-pci.c b/drivers/i2c/busses/i2c-amd-mp2-pci.c
> new file mode 100644
> index 000000000000..455e1f36a2a3
> --- /dev/null
> +++ b/drivers/i2c/busses/i2c-amd-mp2-pci.c
> @@ -0,0 +1,483 @@
> +// SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause
> +/*
> + * AMD MP2 PCIe communication driver
> + *
> + * Authors: Shyam Sundar S K <Shyam-sundar.S-k@amd.com>
> + *          Elie Morisse <syniurge@gmail.com>
> + */
> +
> +#include <linux/dma-mapping.h>
> +#include <linux/interrupt.h>
> +#include <linux/module.h>
> +#include <linux/pci.h>
> +#include <linux/slab.h>
> +
> +#include "i2c-amd-mp2.h"
> +
> +#include <linux/io-64-nonatomic-lo-hi.h>
> +
> +static void amd_mp2_c2p_mutex_lock(struct amd_i2c_common *i2c_common)
> +{
> +	struct amd_mp2_dev *privdata = i2c_common->mp2_dev;
> +
> +	/* there is only one data mailbox for two i2c adapters */
> +	mutex_lock(&privdata->c2p_lock);
> +	privdata->c2p_lock_busid = i2c_common->bus_id;
> +}
> +
> +static void amd_mp2_c2p_mutex_unlock(struct amd_i2c_common *i2c_common)
> +{
> +	struct amd_mp2_dev *privdata = i2c_common->mp2_dev;
> +
> +	if (unlikely(privdata->c2p_lock_busid != i2c_common->bus_id)) {
> +		dev_warn(ndev_dev(privdata),
> +			 "bus %d attempting to unlock C2P locked by bus %d\n",
> +			 i2c_common->bus_id, privdata->c2p_lock_busid);
> +		return;
> +	}
> +
> +	mutex_unlock(&privdata->c2p_lock);
> +}
> +
> +static int amd_mp2_cmd(struct amd_i2c_common *i2c_common,
> +		       union i2c_cmd_base i2c_cmd_base)
> +{
> +	struct amd_mp2_dev *privdata = i2c_common->mp2_dev;
> +	void __iomem *reg;
> +
> +	i2c_common->reqcmd = i2c_cmd_base.s.i2c_cmd;
> +
> +	reg = privdata->mmio + ((i2c_cmd_base.s.bus_id == 1) ?
> +				AMD_C2P_MSG1 : AMD_C2P_MSG0);
> +	writel(i2c_cmd_base.ul, reg);
> +
> +	return 0;
> +}
> +
> +int amd_mp2_bus_enable_set(struct amd_i2c_common *i2c_common, bool enable)
> +{
> +	struct amd_mp2_dev *privdata = i2c_common->mp2_dev;
> +	union i2c_cmd_base i2c_cmd_base;
> +
> +	dev_dbg(ndev_dev(privdata), "%s id: %d\n", __func__,
> +		i2c_common->bus_id);
> +
> +	i2c_cmd_base.ul = 0;
> +	i2c_cmd_base.s.i2c_cmd = enable ? i2c_enable : i2c_disable;
> +	i2c_cmd_base.s.bus_id = i2c_common->bus_id;
> +	i2c_cmd_base.s.i2c_speed = i2c_common->i2c_speed;
> +
> +	amd_mp2_c2p_mutex_lock(i2c_common);
> +
> +	return amd_mp2_cmd(i2c_common, i2c_cmd_base);
> +}
> +EXPORT_SYMBOL_GPL(amd_mp2_bus_enable_set);
> +
> +static void amd_mp2_cmd_rw_fill(struct amd_i2c_common *i2c_common,
> +				union i2c_cmd_base *i2c_cmd_base,
> +				enum i2c_cmd reqcmd)
> +{
> +	i2c_cmd_base->s.i2c_cmd = reqcmd;
> +	i2c_cmd_base->s.bus_id = i2c_common->bus_id;
> +	i2c_cmd_base->s.i2c_speed = i2c_common->i2c_speed;
> +	i2c_cmd_base->s.slave_addr = i2c_common->msg->addr;
> +	i2c_cmd_base->s.length = i2c_common->msg->len;
> +}
> +
> +int amd_mp2_rw(struct amd_i2c_common *i2c_common, enum i2c_cmd reqcmd)
> +{
> +	struct amd_mp2_dev *privdata = i2c_common->mp2_dev;
> +	union i2c_cmd_base i2c_cmd_base;
> +
> +	amd_mp2_cmd_rw_fill(i2c_common, &i2c_cmd_base, reqcmd);
> +	amd_mp2_c2p_mutex_lock(i2c_common);
> +
> +	if (i2c_common->msg->len <= 32) {
> +		i2c_cmd_base.s.mem_type = use_c2pmsg;
> +		if (reqcmd == i2c_write)
> +			memcpy_toio(privdata->mmio + AMD_C2P_MSG2,
> +				    i2c_common->msg->buf,
> +				    i2c_common->msg->len);
> +	} else {
> +		i2c_cmd_base.s.mem_type = use_dram;
> +		writeq((u64)i2c_common->dma_addr,
> +		       privdata->mmio + AMD_C2P_MSG2);
> +	}
> +
> +	return amd_mp2_cmd(i2c_common, i2c_cmd_base);
> +}
> +EXPORT_SYMBOL_GPL(amd_mp2_rw);
> +
> +static void amd_mp2_pci_check_rw_event(struct amd_i2c_common *i2c_common)
> +{
> +	struct amd_mp2_dev *privdata = i2c_common->mp2_dev;
> +	int len = i2c_common->eventval.r.length;
> +	u32 slave_addr = i2c_common->eventval.r.slave_addr;
> +	bool err = false;
> +
> +	if (unlikely(len != i2c_common->msg->len)) {
> +		dev_err(ndev_dev(privdata),
> +			"length %d in event doesn't match buffer length %d!\n",
> +			len, i2c_common->msg->len);
> +		err = true;
> +	}
> +
> +	if (unlikely(slave_addr != i2c_common->msg->addr)) {
> +		dev_err(ndev_dev(privdata),
> +			"unexpected slave address %x (expected: %x)!\n",
> +			slave_addr, i2c_common->msg->addr);
> +		err = true;
> +	}
> +
> +	if (!err)
> +		i2c_common->cmd_success = true;
> +}
> +
> +static void __amd_mp2_process_event(struct amd_i2c_common *i2c_common)
> +{
> +	struct amd_mp2_dev *privdata = i2c_common->mp2_dev;
> +	enum status_type sts = i2c_common->eventval.r.status;
> +	enum response_type res = i2c_common->eventval.r.response;
> +	int len = i2c_common->eventval.r.length;
> +
> +	if (res != command_success) {
> +		if (res != command_failed)
> +			dev_err(ndev_dev(privdata), "invalid response to i2c command!\n");
> +		return;
> +	}
> +
> +	switch (i2c_common->reqcmd) {
> +	case i2c_read:
> +		if (sts == i2c_readcomplete_event) {
> +			amd_mp2_pci_check_rw_event(i2c_common);
> +			if (len <= 32)
> +				memcpy_fromio(i2c_common->msg->buf,
> +					      privdata->mmio + AMD_C2P_MSG2,
> +					      len);
> +		} else if (sts != i2c_readfail_event) {
> +			dev_err(ndev_dev(privdata),
> +				"invalid i2c status after read (%d)!\n", sts);
> +		}
> +		break;
> +	case i2c_write:
> +		if (sts == i2c_writecomplete_event)
> +			amd_mp2_pci_check_rw_event(i2c_common);
> +		else if (sts != i2c_writefail_event)
> +			dev_err(ndev_dev(privdata),
> +				"invalid i2c status after write (%d)!\n", sts);
> +		break;
> +	case i2c_enable:
> +		if (sts == i2c_busenable_complete)
> +			i2c_common->cmd_success = true;
> +		else if (sts != i2c_busenable_failed)
> +			dev_err(ndev_dev(privdata),
> +				"invalid i2c status after bus enable (%d)!\n",
> +				sts);
> +		break;
> +	case i2c_disable:
> +		if (sts == i2c_busdisable_complete)
> +			i2c_common->cmd_success = true;
> +		else if (sts != i2c_busdisable_failed)
> +			dev_err(ndev_dev(privdata),
> +				"invalid i2c status after bus disable (%d)!\n",
> +				sts);
> +		break;
> +	default:
> +		break;
> +	}
> +}
> +
> +void amd_mp2_process_event(struct amd_i2c_common *i2c_common)
> +{
> +	struct amd_mp2_dev *privdata = i2c_common->mp2_dev;
> +
> +	if (unlikely(i2c_common->reqcmd == i2c_none)) {
> +		dev_warn(ndev_dev(privdata),
> +			 "received msg but no cmd was sent (bus = %d)!\n",
> +			 i2c_common->bus_id);
> +		return;
> +	}
> +
> +	__amd_mp2_process_event(i2c_common);
> +
> +	i2c_common->reqcmd = i2c_none;
> +	amd_mp2_c2p_mutex_unlock(i2c_common);
> +}
> +EXPORT_SYMBOL_GPL(amd_mp2_process_event);
> +
> +static irqreturn_t amd_mp2_irq_isr(int irq, void *dev)
> +{
> +	struct amd_mp2_dev *privdata = dev;
> +	struct amd_i2c_common *i2c_common;
> +	u32 val;
> +	unsigned int bus_id;
> +	void __iomem *reg;
> +	enum irqreturn ret = IRQ_NONE;
> +
> +	for (bus_id = 0; bus_id < 2; bus_id++) {
> +		i2c_common = privdata->busses[bus_id];
> +		if (!i2c_common)
> +			continue;
> +
> +		reg = privdata->mmio + ((bus_id == 0) ?
> +					AMD_P2C_MSG1 : AMD_P2C_MSG2);
> +		val = readl(reg);
> +		if (val != 0) {
> +			writel(0, reg);
> +			writel(0, privdata->mmio + AMD_P2C_MSG_INTEN);
> +			i2c_common->eventval.ul = val;
> +			i2c_common->cmd_completion(i2c_common);
> +
> +			ret = IRQ_HANDLED;
> +		}
> +	}
> +
> +	if (ret != IRQ_HANDLED) {
> +		val = readl(privdata->mmio + AMD_P2C_MSG_INTEN);
> +		if (val != 0) {
> +			writel(0, privdata->mmio + AMD_P2C_MSG_INTEN);
> +			dev_warn(ndev_dev(privdata),
> +				 "received irq without message\n");
> +			ret = IRQ_HANDLED;
> +		}
> +	}
> +
> +	return ret;
> +}
> +
> +void amd_mp2_rw_timeout(struct amd_i2c_common *i2c_common)
> +{
> +	i2c_common->reqcmd = i2c_none;
> +	amd_mp2_c2p_mutex_unlock(i2c_common);
> +}
> +EXPORT_SYMBOL_GPL(amd_mp2_rw_timeout);
> +
> +int amd_mp2_register_cb(struct amd_i2c_common *i2c_common)
> +{
> +	struct amd_mp2_dev *privdata = i2c_common->mp2_dev;
> +
> +	if (i2c_common->bus_id > 1)
> +		return -EINVAL;
> +
> +	if (privdata->busses[i2c_common->bus_id]) {
> +		dev_err(ndev_dev(privdata),
> +			"Bus %d already taken!\n", i2c_common->bus_id);
> +		return -EINVAL;
> +	}
> +
> +	privdata->busses[i2c_common->bus_id] = i2c_common;
> +
> +	return 0;
> +}
> +EXPORT_SYMBOL_GPL(amd_mp2_register_cb);
> +
> +int amd_mp2_unregister_cb(struct amd_i2c_common *i2c_common)
> +{
> +	struct amd_mp2_dev *privdata = i2c_common->mp2_dev;
> +
> +	privdata->busses[i2c_common->bus_id] = NULL;
> +
> +	return 0;
> +}
> +EXPORT_SYMBOL_GPL(amd_mp2_unregister_cb);
> +
> +static void amd_mp2_clear_reg(struct amd_mp2_dev *privdata)
> +{
> +	int reg;
> +
> +	for (reg = AMD_C2P_MSG0; reg <= AMD_C2P_MSG9; reg += 4)
> +		writel(0, privdata->mmio + reg);
> +
> +	for (reg = AMD_P2C_MSG1; reg <= AMD_P2C_MSG2; reg += 4)
> +		writel(0, privdata->mmio + reg);
> +}
> +
> +static int amd_mp2_pci_init(struct amd_mp2_dev *privdata,
> +			    struct pci_dev *pci_dev)
> +{
> +	int rc;
> +
> +	pci_set_drvdata(pci_dev, privdata);
> +
> +	rc = pcim_enable_device(pci_dev);
> +	if (rc) {
> +		dev_err(ndev_dev(privdata), "Failed to enable MP2 PCI device\n");
> +		goto err_pci_enable;
> +	}
> +
> +	rc = pcim_iomap_regions(pci_dev, 1 << 2, pci_name(pci_dev));
> +	if (rc) {
> +		dev_err(ndev_dev(privdata), "I/O memory remapping failed\n");
> +		goto err_pci_enable;
> +	}
> +	privdata->mmio = pcim_iomap_table(pci_dev)[2];
> +
> +	pci_set_master(pci_dev);
> +
> +	rc = pci_set_dma_mask(pci_dev, DMA_BIT_MASK(64));
> +	if (rc) {
> +		rc = pci_set_dma_mask(pci_dev, DMA_BIT_MASK(32));
> +		if (rc)
> +			goto err_dma_mask;
> +	}
> +
> +	/* Set up intx irq */
> +	writel(0, privdata->mmio + AMD_P2C_MSG_INTEN);
> +	pci_intx(pci_dev, 1);
> +	rc = devm_request_irq(&pci_dev->dev, pci_dev->irq, amd_mp2_irq_isr,
> +			      IRQF_SHARED, dev_name(&pci_dev->dev), privdata);
> +	if (rc)
> +		dev_err(&pci_dev->dev, "Failure requesting irq %i: %d\n",
> +			pci_dev->irq, rc);
> +
> +	return rc;
> +
> +err_dma_mask:
> +	pci_clear_master(pci_dev);
> +err_pci_enable:
> +	pci_set_drvdata(pci_dev, NULL);
> +	return rc;
> +}
> +
> +static int amd_mp2_pci_probe(struct pci_dev *pci_dev,
> +			     const struct pci_device_id *id)
> +{
> +	struct amd_mp2_dev *privdata;
> +	int rc;
> +
> +	privdata = devm_kzalloc(&pci_dev->dev, sizeof(*privdata), GFP_KERNEL);
> +	if (!privdata)
> +		return -ENOMEM;
> +
> +	rc = amd_mp2_pci_init(privdata, pci_dev);
> +	if (rc)
> +		return rc;
> +
> +	mutex_init(&privdata->c2p_lock);
> +	privdata->pci_dev = pci_dev;
> +
> +	pm_runtime_set_autosuspend_delay(&pci_dev->dev, 1000);
> +	pm_runtime_use_autosuspend(&pci_dev->dev);
> +	pm_runtime_put_autosuspend(&pci_dev->dev);
> +	pm_runtime_allow(&pci_dev->dev);
> +
> +	privdata->probed = true;
> +
> +	dev_info(&pci_dev->dev, "MP2 device registered.\n");
> +	return 0;
> +}
> +
> +static void amd_mp2_pci_remove(struct pci_dev *pci_dev)
> +{
> +	struct amd_mp2_dev *privdata = pci_get_drvdata(pci_dev);
> +
> +	pm_runtime_forbid(&pci_dev->dev);
> +	pm_runtime_get_noresume(&pci_dev->dev);
> +
> +	pci_intx(pci_dev, 0);
> +	pci_clear_master(pci_dev);
> +
> +	amd_mp2_clear_reg(privdata);
> +}
> +
> +#ifdef CONFIG_PM
> +static int amd_mp2_pci_suspend(struct device *dev)
> +{
> +	struct pci_dev *pci_dev = to_pci_dev(dev);
> +	struct amd_mp2_dev *privdata = pci_get_drvdata(pci_dev);
> +	struct amd_i2c_common *i2c_common;
> +	unsigned int bus_id;
> +	int ret = 0;
> +
> +	for (bus_id = 0; bus_id < 2; bus_id++) {
> +		i2c_common = privdata->busses[bus_id];
> +		if (i2c_common)
> +			i2c_common->suspend(i2c_common);
> +	}
> +
> +	ret = pci_save_state(pci_dev);
> +	if (ret) {
> +		dev_err(ndev_dev(privdata),
> +			"pci_save_state failed = %d\n", ret);
> +		return ret;
> +	}
> +
> +	pci_disable_device(pci_dev);
> +	return ret;
> +}
> +
> +static int amd_mp2_pci_resume(struct device *dev)
> +{
> +	struct pci_dev *pci_dev = to_pci_dev(dev);
> +	struct amd_mp2_dev *privdata = pci_get_drvdata(pci_dev);
> +	struct amd_i2c_common *i2c_common;
> +	unsigned int bus_id;
> +	int ret = 0;
> +
> +	pci_restore_state(pci_dev);
> +	ret = pci_enable_device(pci_dev);
> +	if (ret < 0) {
> +		dev_err(ndev_dev(privdata),
> +			"pci_enable_device failed = %d\n", ret);
> +		return ret;
> +	}
> +
> +	for (bus_id = 0; bus_id < 2; bus_id++) {
> +		i2c_common = privdata->busses[bus_id];
> +		if (i2c_common) {
> +			ret = i2c_common->resume(i2c_common);
> +			if (ret < 0)
> +				return ret;
> +		}
> +	}
> +
> +	return ret;
> +}
> +
> +static UNIVERSAL_DEV_PM_OPS(amd_mp2_pci_pm_ops, amd_mp2_pci_suspend,
> +			    amd_mp2_pci_resume, NULL);
> +#endif /* CONFIG_PM */
> +
> +static const struct pci_device_id amd_mp2_pci_tbl[] = {
> +	{PCI_VDEVICE(AMD, PCI_DEVICE_ID_AMD_MP2)},
> +	{0}
> +};
> +MODULE_DEVICE_TABLE(pci, amd_mp2_pci_tbl);
> +
> +static struct pci_driver amd_mp2_pci_driver = {
> +	.name		= "i2c_amd_mp2",
> +	.id_table	= amd_mp2_pci_tbl,
> +	.probe		= amd_mp2_pci_probe,
> +	.remove		= amd_mp2_pci_remove,
> +#ifdef CONFIG_PM
> +	.driver = {
> +		.pm	= &amd_mp2_pci_pm_ops,
> +	},
> +#endif
> +};
> +module_pci_driver(amd_mp2_pci_driver);
> +
> +static int amd_mp2_device_match(struct device *dev, void *data)
> +{
> +	return 1;
> +}
> +
> +struct amd_mp2_dev *amd_mp2_find_device(void)
> +{
> +	struct device *dev;
> +	struct pci_dev *pci_dev;
> +
> +	dev = driver_find_device(&amd_mp2_pci_driver.driver, NULL, NULL,
> +				 amd_mp2_device_match);
> +	if (!dev)
> +		return NULL;
> +
> +	pci_dev = to_pci_dev(dev);
> +	return (struct amd_mp2_dev *)pci_get_drvdata(pci_dev);
> +}
> +EXPORT_SYMBOL_GPL(amd_mp2_find_device);
> +
> +MODULE_DESCRIPTION("AMD(R) PCI-E MP2 I2C Controller Driver");
> +MODULE_AUTHOR("Shyam Sundar S K <Shyam-sundar.S-k@amd.com>");
> +MODULE_AUTHOR("Elie Morisse <syniurge@gmail.com>");
> +MODULE_LICENSE("Dual BSD/GPL");
> diff --git a/drivers/i2c/busses/i2c-amd-mp2-plat.c b/drivers/i2c/busses/i2c-amd-mp2-plat.c
> new file mode 100644
> index 000000000000..f5b3f00c6559
> --- /dev/null
> +++ b/drivers/i2c/busses/i2c-amd-mp2-plat.c
> @@ -0,0 +1,367 @@
> +// SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause
> +/*
> + * AMD MP2 platform driver
> + *
> + * Setup the I2C adapters enumerated in the ACPI namespace.
> + * MP2 controllers have 2 separate busses, up to 2 I2C adapters may be listed.
> + *
> + * Authors: Nehal Bakulchandra Shah <Nehal-bakulchandra.shah@amd.com>
> + *          Elie Morisse <syniurge@gmail.com>
> + */
> +
> +#include <linux/acpi.h>
> +#include <linux/kernel.h>
> +#include <linux/module.h>
> +#include <linux/platform_device.h>
> +#include <linux/slab.h>
> +#include <linux/types.h>
> +
> +#include "i2c-amd-mp2.h"
> +
> +#define AMD_MP2_I2C_MAX_RW_LENGTH ((1 << 12) - 1)
> +#define AMD_I2C_TIMEOUT (msecs_to_jiffies(250))
> +
> +/**
> + * struct amd_i2c_dev - MP2 bus/i2c adapter context
> + * @common: shared context with the MP2 PCI driver
> + * @pdev: platform driver node
> + * @adap: i2c adapter
> + * @cmd_complete: xfer completion object
> + */
> +struct amd_i2c_dev {
> +	struct amd_i2c_common common;
> +	struct platform_device *pdev;
> +	struct i2c_adapter adap;
> +	struct completion cmd_complete;
> +};
> +
> +#define amd_i2c_dev_common(__common) \
> +	container_of(__common, struct amd_i2c_dev, common)
> +
> +static int i2c_amd_dma_map(struct amd_i2c_common *i2c_common)
> +{
> +	struct device *dev_pci = &i2c_common->mp2_dev->pci_dev->dev;
> +	struct amd_i2c_dev *i2c_dev = amd_i2c_dev_common(i2c_common);
> +	enum dma_data_direction dma_direction =
> +			i2c_common->msg->flags & I2C_M_RD ?
> +			DMA_FROM_DEVICE : DMA_TO_DEVICE;
> +
> +	i2c_common->dma_buf = i2c_get_dma_safe_msg_buf(i2c_common->msg, 0);
> +	i2c_common->dma_addr = dma_map_single(dev_pci, i2c_common->dma_buf,
> +					      i2c_common->msg->len,
> +					      dma_direction);
> +
> +	if (unlikely(dma_mapping_error(dev_pci, i2c_common->dma_addr))) {
> +		dev_err(&i2c_dev->pdev->dev,
> +			"Error while mapping dma buffer %p\n",
> +			i2c_common->dma_buf);
> +		return -EIO;
> +	}
> +
> +	return 0;
> +}
> +
> +static void i2c_amd_dma_unmap(struct amd_i2c_common *i2c_common)
> +{
> +	struct device *dev_pci = &i2c_common->mp2_dev->pci_dev->dev;
> +	enum dma_data_direction dma_direction =
> +			i2c_common->msg->flags & I2C_M_RD ?
> +			DMA_FROM_DEVICE : DMA_TO_DEVICE;
> +
> +	dma_unmap_single(dev_pci, i2c_common->dma_addr,
> +			 i2c_common->msg->len, dma_direction);
> +
> +	i2c_put_dma_safe_msg_buf(i2c_common->dma_buf, i2c_common->msg, true);
> +}
> +
> +static void i2c_amd_start_cmd(struct amd_i2c_dev *i2c_dev)
> +{
> +	struct amd_i2c_common *i2c_common = &i2c_dev->common;
> +
> +	reinit_completion(&i2c_dev->cmd_complete);
> +	i2c_common->cmd_success = false;
> +}
> +
> +static void i2c_amd_cmd_completion(struct amd_i2c_common *i2c_common)
> +{
> +	struct amd_i2c_dev *i2c_dev = amd_i2c_dev_common(i2c_common);
> +	union i2c_event *event = &i2c_common->eventval;
> +
> +	if (event->r.status == i2c_readcomplete_event)
> +		dev_dbg(&i2c_dev->pdev->dev, "%s readdata:%*ph\n",
> +			__func__, event->r.length,
> +			i2c_common->msg->buf);
> +
> +	complete(&i2c_dev->cmd_complete);
> +}
> +
> +static int i2c_amd_check_cmd_completion(struct amd_i2c_dev *i2c_dev)
> +{
> +	struct amd_i2c_common *i2c_common = &i2c_dev->common;
> +	unsigned long timeout;
> +
> +	timeout = wait_for_completion_timeout(&i2c_dev->cmd_complete,
> +					      i2c_dev->adap.timeout);
> +
> +	if ((i2c_common->reqcmd == i2c_read ||
> +	     i2c_common->reqcmd == i2c_write) &&
> +	    i2c_common->msg->len > 32)
> +		i2c_amd_dma_unmap(i2c_common);
> +
> +	if (timeout == 0) {
> +		amd_mp2_rw_timeout(i2c_common);
> +		return -ETIMEDOUT;
> +	}
> +
> +	amd_mp2_process_event(i2c_common);
> +
> +	if (!i2c_common->cmd_success)
> +		return -EIO;
> +
> +	return 0;
> +}
> +
> +static int i2c_amd_enable_set(struct amd_i2c_dev *i2c_dev, bool enable)
> +{
> +	struct amd_i2c_common *i2c_common = &i2c_dev->common;
> +
> +	i2c_amd_start_cmd(i2c_dev);
> +	amd_mp2_bus_enable_set(i2c_common, enable);
> +
> +	return i2c_amd_check_cmd_completion(i2c_dev);
> +}
> +
> +static int i2c_amd_xfer_msg(struct amd_i2c_dev *i2c_dev, struct i2c_msg *pmsg)
> +{
> +	struct amd_i2c_common *i2c_common = &i2c_dev->common;
> +
> +	i2c_amd_start_cmd(i2c_dev);
> +	i2c_common->msg = pmsg;
> +
> +	if (pmsg->len > 32)
> +		if (i2c_amd_dma_map(i2c_common))
> +			return -EIO;
> +
> +	if (pmsg->flags & I2C_M_RD)
> +		amd_mp2_rw(i2c_common, i2c_read);
> +	else
> +		amd_mp2_rw(i2c_common, i2c_write);
> +
> +	return i2c_amd_check_cmd_completion(i2c_dev);
> +}
> +
> +static int i2c_amd_xfer(struct i2c_adapter *adap, struct i2c_msg *msgs, int num)
> +{
> +	struct amd_i2c_dev *i2c_dev = i2c_get_adapdata(adap);
> +	int i;
> +	struct i2c_msg *pmsg;
> +	int err;
> +
> +	/* the adapter might have been deleted while waiting for the bus lock */
> +	if (unlikely(!i2c_dev->common.mp2_dev))
> +		return -EINVAL;
> +
> +	amd_mp2_pm_runtime_get(i2c_dev->common.mp2_dev);
> +
> +	for (i = 0; i < num; i++) {
> +		pmsg = &msgs[i];
> +		err = i2c_amd_xfer_msg(i2c_dev, pmsg);
> +		if (err)
> +			break;
> +	}
> +
> +	amd_mp2_pm_runtime_put(i2c_dev->common.mp2_dev);
> +	return err ? err : num;
> +}
> +
> +static u32 i2c_amd_func(struct i2c_adapter *a)
> +{
> +	return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL;
> +}
> +
> +static const struct i2c_algorithm i2c_amd_algorithm = {
> +	.master_xfer = i2c_amd_xfer,
> +	.functionality = i2c_amd_func,
> +};
> +
> +#ifdef CONFIG_PM
> +static int i2c_amd_suspend(struct amd_i2c_common *i2c_common)
> +{
> +	struct amd_i2c_dev *i2c_dev = amd_i2c_dev_common(i2c_common);
> +
> +	i2c_amd_enable_set(i2c_dev, false);
> +	return 0;
> +}
> +
> +static int i2c_amd_resume(struct amd_i2c_common *i2c_common)
> +{
> +	struct amd_i2c_dev *i2c_dev = amd_i2c_dev_common(i2c_common);
> +
> +	return i2c_amd_enable_set(i2c_dev, true);
> +}
> +#endif
> +
> +static enum speed_enum i2c_amd_get_bus_speed(struct platform_device *pdev)
> +{
> +	u32 acpi_speed;
> +	int i;
> +	static const u32 supported_speeds[] = {
> +		0, 100000, 400000, 1000000, 1400000, 3400000
> +	};
> +
> +	acpi_speed = i2c_acpi_find_bus_speed(&pdev->dev);
> +	/* round down to the lowest standard speed */
> +	for (i = 1; i < ARRAY_SIZE(supported_speeds); i++) {
> +		if (acpi_speed < supported_speeds[i])
> +			break;
> +	}
> +	acpi_speed = supported_speeds[i - 1];
> +
> +	switch (acpi_speed) {
> +	case 100000:
> +		return speed100k;
> +	case 400000:
> +		return speed400k;
> +	case 1000000:
> +		return speed1000k;
> +	case 1400000:
> +		return speed1400k;
> +	case 3400000:
> +		return speed3400k;
> +	default:
> +		return speed400k;
> +	}
> +}
> +
> +static const struct i2c_adapter_quirks amd_i2c_dev_quirks = {
> +	.max_read_len = AMD_MP2_I2C_MAX_RW_LENGTH,
> +	.max_write_len = AMD_MP2_I2C_MAX_RW_LENGTH,
> +};
> +
> +static int i2c_amd_probe(struct platform_device *pdev)
> +{
> +	int ret;
> +	struct amd_i2c_dev *i2c_dev;
> +	acpi_handle handle = ACPI_HANDLE(&pdev->dev);
> +	struct acpi_device *adev;
> +	struct amd_mp2_dev *mp2_dev;
> +	const char *uid;
> +
> +	if (acpi_bus_get_device(handle, &adev))
> +		return -ENODEV;
> +
> +	/* The ACPI namespace doesn't contain information about which MP2 PCI
> +	 * device an AMDI0011 ACPI device is related to, so assume that there's
> +	 * only one MP2 PCI device per system.
> +	 */
> +	mp2_dev = amd_mp2_find_device();
> +	if (!mp2_dev || !mp2_dev->probed)
> +		/* The MP2 PCI device should get probed later */
> +		return -EPROBE_DEFER;
> +
> +	i2c_dev = devm_kzalloc(&pdev->dev, sizeof(*i2c_dev), GFP_KERNEL);
> +	if (!i2c_dev)
> +		return -ENOMEM;
> +
> +	i2c_dev->common.mp2_dev = mp2_dev;
> +	i2c_dev->pdev = pdev;
> +	platform_set_drvdata(pdev, i2c_dev);
> +
> +	i2c_dev->common.cmd_completion = &i2c_amd_cmd_completion;
> +#ifdef CONFIG_PM
> +	i2c_dev->common.suspend = &i2c_amd_suspend;
> +	i2c_dev->common.resume = &i2c_amd_resume;
> +#endif
> +
> +	uid = adev->pnp.unique_id;
> +	if (!uid) {
> +		dev_err(&pdev->dev, "missing UID/bus id!\n");
> +		return -EINVAL;
> +	} else if (strcmp(uid, "0") == 0) {
> +		i2c_dev->common.bus_id = 0;
> +	} else if (strcmp(uid, "1") == 0) {
> +		i2c_dev->common.bus_id = 1;
> +	} else {
> +		dev_err(&pdev->dev, "incorrect UID/bus id \"%s\"!\n", uid);
> +		return -EINVAL;
> +	}
> +	dev_dbg(&pdev->dev, "bus id is %u\n", i2c_dev->common.bus_id);
> +
> +	/* Register the adapter */
> +	amd_mp2_pm_runtime_get(mp2_dev);
> +
> +	i2c_dev->common.reqcmd = i2c_none;
> +	if (amd_mp2_register_cb(&i2c_dev->common))
> +		return -EINVAL;
> +	device_link_add(&i2c_dev->pdev->dev, &mp2_dev->pci_dev->dev,
> +			DL_FLAG_AUTOREMOVE_CONSUMER);
> +
> +	i2c_dev->common.i2c_speed = i2c_amd_get_bus_speed(pdev);
> +
> +	/* Setup i2c adapter description */
> +	i2c_dev->adap.owner = THIS_MODULE;
> +	i2c_dev->adap.algo = &i2c_amd_algorithm;
> +	i2c_dev->adap.quirks = &amd_i2c_dev_quirks;
> +	i2c_dev->adap.dev.parent = &pdev->dev;
> +	i2c_dev->adap.algo_data = i2c_dev;
> +	i2c_dev->adap.timeout = AMD_I2C_TIMEOUT;
> +	ACPI_COMPANION_SET(&i2c_dev->adap.dev, ACPI_COMPANION(&pdev->dev));
> +	i2c_dev->adap.dev.of_node = pdev->dev.of_node;
> +	snprintf(i2c_dev->adap.name, sizeof(i2c_dev->adap.name),
> +		 "AMD MP2 i2c bus %u", i2c_dev->common.bus_id);
> +	i2c_set_adapdata(&i2c_dev->adap, i2c_dev);
> +
> +	init_completion(&i2c_dev->cmd_complete);
> +
> +	/* Enable the bus */
> +	if (i2c_amd_enable_set(i2c_dev, true))
> +		dev_err(&pdev->dev, "initial bus enable failed\n");
> +
> +	/* Attach to the i2c layer */
> +	ret = i2c_add_adapter(&i2c_dev->adap);
> +
> +	amd_mp2_pm_runtime_put(mp2_dev);
> +
> +	if (ret < 0)
> +		dev_err(&pdev->dev, "i2c add adapter failed = %d\n", ret);
> +
> +	return ret;
> +}
> +
> +static int i2c_amd_remove(struct platform_device *pdev)
> +{
> +	struct amd_i2c_dev *i2c_dev = platform_get_drvdata(pdev);
> +	struct amd_i2c_common *i2c_common = &i2c_dev->common;
> +
> +	i2c_lock_bus(&i2c_dev->adap, I2C_LOCK_ROOT_ADAPTER);
> +
> +	i2c_amd_enable_set(i2c_dev, false);
> +	amd_mp2_unregister_cb(i2c_common);
> +	i2c_common->mp2_dev = NULL;
> +
> +	i2c_unlock_bus(&i2c_dev->adap, I2C_LOCK_ROOT_ADAPTER);
> +
> +	i2c_del_adapter(&i2c_dev->adap);
> +	return 0;
> +}
> +
> +static const struct acpi_device_id i2c_amd_acpi_match[] = {
> +	{ "AMDI0011" },
> +	{ },
> +};
> +MODULE_DEVICE_TABLE(acpi, i2c_amd_acpi_match);
> +
> +static struct platform_driver i2c_amd_plat_driver = {
> +	.probe = i2c_amd_probe,
> +	.remove = i2c_amd_remove,
> +	.driver = {
> +		.name = "i2c_amd_mp2",
> +		.acpi_match_table = ACPI_PTR(i2c_amd_acpi_match),
> +	},
> +};
> +module_platform_driver(i2c_amd_plat_driver);
> +
> +MODULE_DESCRIPTION("AMD(R) MP2 I2C Platform Driver");
> +MODULE_AUTHOR("Nehal Shah <nehal-bakulchandra.shah@amd.com>");
> +MODULE_AUTHOR("Elie Morisse <syniurge@gmail.com>");
> +MODULE_LICENSE("Dual BSD/GPL");
> diff --git a/drivers/i2c/busses/i2c-amd-mp2.h b/drivers/i2c/busses/i2c-amd-mp2.h
> new file mode 100644
> index 000000000000..058362edebaa
> --- /dev/null
> +++ b/drivers/i2c/busses/i2c-amd-mp2.h
> @@ -0,0 +1,219 @@
> +/* SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause */
> +/*
> + * AMD MP2 I2C adapter driver
> + *
> + * Authors: Shyam Sundar S K <Shyam-sundar.S-k@amd.com>
> + *          Elie Morisse <syniurge@gmail.com>
> + */
> +
> +#ifndef I2C_AMD_PCI_MP2_H
> +#define I2C_AMD_PCI_MP2_H
> +
> +#include <linux/i2c.h>
> +#include <linux/pci.h>
> +#include <linux/pm_runtime.h>
> +
> +#define PCI_DEVICE_ID_AMD_MP2	0x15E6
> +
> +struct amd_i2c_common;
> +struct amd_mp2_dev;
> +
> +enum {
> +	/* MP2 C2P Message Registers */
> +	AMD_C2P_MSG0 = 0x10500,			/* MP2 Message for I2C0 */
> +	AMD_C2P_MSG1 = 0x10504,			/* MP2 Message for I2C1 */
> +	AMD_C2P_MSG2 = 0x10508,			/* DRAM Address Lo / Data 0 */
> +	AMD_C2P_MSG3 = 0x1050c,			/* DRAM Address HI / Data 1 */
> +	AMD_C2P_MSG4 = 0x10510,			/* Data 2 */
> +	AMD_C2P_MSG5 = 0x10514,			/* Data 3 */
> +	AMD_C2P_MSG6 = 0x10518,			/* Data 4 */
> +	AMD_C2P_MSG7 = 0x1051c,			/* Data 5 */
> +	AMD_C2P_MSG8 = 0x10520,			/* Data 6 */
> +	AMD_C2P_MSG9 = 0x10524,			/* Data 7 */
> +
> +	/* MP2 P2C Message Registers */
> +	AMD_P2C_MSG0 = 0x10680,			/* Do not use */
> +	AMD_P2C_MSG1 = 0x10684,			/* I2C0 interrupt register */
> +	AMD_P2C_MSG2 = 0x10688,			/* I2C1 interrupt register */
> +	AMD_P2C_MSG3 = 0x1068C,			/* MP2 debug info */
> +	AMD_P2C_MSG_INTEN = 0x10690,		/* MP2 interrupt gen register */
> +	AMD_P2C_MSG_INTSTS = 0x10694,		/* Interrupt status */
> +};
> +
> +/* Command register data structures */
> +
> +#define i2c_none (-1)
> +enum i2c_cmd {
> +	i2c_read = 0,
> +	i2c_write,
> +	i2c_enable,
> +	i2c_disable,
> +	number_of_sensor_discovered,
> +	is_mp2_active,
> +	invalid_cmd = 0xF,
> +};
> +
> +enum speed_enum {
> +	speed100k = 0,
> +	speed400k = 1,
> +	speed1000k = 2,
> +	speed1400k = 3,
> +	speed3400k = 4
> +};
> +
> +enum mem_type {
> +	use_dram = 0,
> +	use_c2pmsg = 1,
> +};
> +
> +/**
> + * union i2c_cmd_base : bit access of C2P commands
> + * @i2c_cmd: bit 0..3 i2c R/W command
> + * @bus_id: bit 4..7 i2c bus index
> + * @slave_addr: bit 8..15 slave address
> + * @length: bit 16..27 read/write length
> + * @i2c_speed: bit 28..30 bus speed
> + * @mem_type: bit 31 0-DRAM; 1-C2P msg o/p
> + */
> +union i2c_cmd_base {
> +	u32 ul;
> +	struct {
> +		enum i2c_cmd i2c_cmd : 4;
> +		u8 bus_id : 4;
> +		u32 slave_addr : 8;
> +		u32 length : 12;
> +		enum speed_enum i2c_speed : 3;
> +		enum mem_type mem_type : 1;
> +	} s;
> +};
> +
> +enum response_type {
> +	invalid_response = 0,
> +	command_success = 1,
> +	command_failed = 2,
> +};
> +
> +enum status_type {
> +	i2c_readcomplete_event = 0,
> +	i2c_readfail_event = 1,
> +	i2c_writecomplete_event = 2,
> +	i2c_writefail_event = 3,
> +	i2c_busenable_complete = 4,
> +	i2c_busenable_failed = 5,
> +	i2c_busdisable_complete = 6,
> +	i2c_busdisable_failed = 7,
> +	invalid_data_length = 8,
> +	invalid_slave_address = 9,
> +	invalid_i2cbus_id = 10,
> +	invalid_dram_addr = 11,
> +	invalid_command = 12,
> +	mp2_active = 13,
> +	numberof_sensors_discovered_resp = 14,
> +	i2c_bus_notinitialized
> +};
> +
> +/**
> + * union i2c_event : bit access of P2C events
> + * @response: bit 0..1 i2c response type
> + * @status: bit 2..6 status_type
> + * @mem_type: bit 7 0-DRAM; 1-C2P msg o/p
> + * @bus_id: bit 8..11 i2c bus id
> + * @length: bit 12..23 message length
> + * @slave_addr: bit 24-31 slave address
> + */
> +union i2c_event {
> +	u32 ul;
> +	struct {
> +		enum response_type response : 2;
> +		enum status_type status : 5;
> +		enum mem_type mem_type : 1;
> +		u8 bus_id : 4;
> +		u32 length : 12;
> +		u32 slave_addr : 8;
> +	} r;
> +};
> +
> +/**
> + * struct amd_i2c_common - per bus/i2c adapter context, shared
> + *	between the pci and the platform driver
> + * @eventval: MP2 event value set by the IRQ handler
> + * @mp2_dev: MP2 pci device this adapter is part of
> + * @msg: i2c message
> + * @cmd_completion: function called by the IRQ handler to signal
> + *		    the platform driver
> + * @reqcmd: requested i2c command type
> + * @cmd_success: set to true if the MP2 responded to a command with
> + *		 the expected status and response type
> + * @bus_id: bus index
> + * @i2c_speed: i2c bus speed determined by the slowest slave
> + * @dma_buf: if msg length > 32, holds the DMA buffer virtual address
> + * @dma_addr: if msg length > 32, holds the DMA buffer address
> + */
> +struct amd_i2c_common {
> +	union i2c_event eventval;
> +	struct amd_mp2_dev *mp2_dev;
> +	struct i2c_msg *msg;
> +	void (*cmd_completion)(struct amd_i2c_common *i2c_common);
> +	enum i2c_cmd reqcmd;
> +	u8 cmd_success;
> +	u8 bus_id;
> +	enum speed_enum i2c_speed;
> +	u8 *dma_buf;
> +	dma_addr_t dma_addr;
> +#ifdef CONFIG_PM
> +	int (*suspend)(struct amd_i2c_common *i2c_common);
> +	int (*resume)(struct amd_i2c_common *i2c_common);
> +#endif /* CONFIG_PM */
> +};
> +
> +/**
> + * struct amd_mp2_dev - per PCI device context
> + * @pci_dev: PCI driver node
> + * @busses: MP2 devices may have up to two busses,
> + *	    each bus corresponding to an i2c adapter
> + * @mmio: iommapped registers
> + * @c2p_lock: controls access to the C2P mailbox shared between
> + *	      the two adapters
> + * @c2p_lock_busid: id of the adapter which locked c2p_lock
> + */
> +struct amd_mp2_dev {
> +	struct pci_dev *pci_dev;
> +	struct amd_i2c_common *busses[2];
> +	void __iomem *mmio;
> +	struct mutex c2p_lock;
> +	u8 c2p_lock_busid;
> +	unsigned int probed;
> +};
> +
> +#define ndev_pdev(ndev) ((ndev)->pci_dev)
> +#define ndev_name(ndev) pci_name(ndev_pdev(ndev))
> +#define ndev_dev(ndev) (&ndev_pdev(ndev)->dev)
> +#define work_amd_i2c_common(__work) \
> +	container_of(__work, struct amd_i2c_common, work.work)
> +
> +/* PCIe communication driver */
> +
> +int amd_mp2_rw(struct amd_i2c_common *i2c_common, enum i2c_cmd reqcmd);
> +int amd_mp2_bus_enable_set(struct amd_i2c_common *i2c_common, bool enable);
> +
> +void amd_mp2_process_event(struct amd_i2c_common *i2c_common);
> +
> +void amd_mp2_rw_timeout(struct amd_i2c_common *i2c_common);
> +
> +int amd_mp2_register_cb(struct amd_i2c_common *i2c_common);
> +int amd_mp2_unregister_cb(struct amd_i2c_common *i2c_common);
> +
> +struct amd_mp2_dev *amd_mp2_find_device(void);
> +
> +static inline void amd_mp2_pm_runtime_get(struct amd_mp2_dev *mp2_dev)
> +{
> +	pm_runtime_get_sync(&mp2_dev->pci_dev->dev);
> +}
> +
> +static inline void amd_mp2_pm_runtime_put(struct amd_mp2_dev *mp2_dev)
> +{
> +	pm_runtime_mark_last_busy(&mp2_dev->pci_dev->dev);
> +	pm_runtime_put_autosuspend(&mp2_dev->pci_dev->dev);
> +}
> +
> +#endif
> 

Thanks for the push.
Looks Ok and as mentioned in previous mail, we need both modules separately.

Thanks
Nehal Shah

On Tue, Mar 05, 2019 at 12:13:19PM -0300, Elie Morisse wrote:
> MP2 controllers have two separate busses, so may accommodate up to two I2C
> adapters. Those adapters are listed in the ACPI namespace with the
> "AMDI0011" HID, and probed by a platform driver.
> 
> Communication with the MP2 takes place through MMIO registers, or through
> DMA for more than 32 bytes transfers.
> 
> This is major rework of the patch submitted by Nehal-bakulchandra Shah from
> AMD (https://patchwork.kernel.org/patch/10597369/).
> 
> Most of the event handling of v3 was rewritten to make it work with more
> than one bus (e.g on Ryzen-based Lenovo Yoga 530), and this version
> contains many other improvements.
> 
> Signed-off-by: Elie Morisse <syniurge@gmail.com>

OK, there are still some parts I am not exactly happy with (e.g. the
find/match_device mechanism), but the driver seems to work and I don't
see major blockers anymore. The remaining issues can be fixed
incrementally. Hopefully the driver will become more visible now.

Applied to for-next, thanks everyone, especially Elie!