do_div is the wrong way to divide a sector_t, as it is less efficient
when sector_t is 32-bit wide. With the upcoming do_div optimizations,
the kernel starts warning about this:

drivers/scsi/scsi_debug.c: In function 'dif_store':
include/asm-generic/div64.h:207:28: warning: comparison of distinct pointer types lacks a cast

This changes the code to use sector_div instead, which always produces
optimal code.
Signed-off-by: NArnd Bergmann <arnd@arndb.de>
Reviewed-by: NHannes Reinicke <hare@suse.de>
Reviewed-by: NSagi Grimberg <sagig@mellanox.com>
Reviewed-by: NJohannes Thumshirn <jthumshirn@suse.de>
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>

Originally the driver would use of_irq_count to calculate how much
memory is required for storing the interrupt names, since the number of
interrupt sources for the controller is variable.  Since of_irq_count
cannot be used by the driver, use fixed names.
Signed-off-by: NJohn Garry <john.garry@huawei.com>
Signed-off-by: NZhangfei Gao <zhangfei.gao@linaro.org>
Acked-by: NRob Herring <robh@kernel.org>
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>

Add maintainer for HiSilicon SAS driver.
Signed-off-by: NJohn Garry <john.garry@huawei.com>
Reviewed-by: NArnd Bergmann <arnd@arndb.de>
Reviewed-by: NHannes Reinecke <hare@suse.de>
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>

Add handlers for fatal interrupts.
Signed-off-by: NJohn Garry <john.garry@huawei.com>
Reviewed-by: NArnd Bergmann <arnd@arndb.de>
Reviewed-by: NHannes Reinecke <hare@suse.de>
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>

Add method for lldd_control_phy. Currently link rate control and spinup
hold is unsupported.
Signed-off-by: NJohn Garry <john.garry@huawei.com>
Reviewed-by: NArnd Bergmann <arnd@arndb.de>
Reviewed-by: NHannes Reinecke <hare@suse.de>
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>

Add function methods for tmf's.
Signed-off-by: NJohn Garry <john.garry@huawei.com>
Reviewed-by: NArnd Bergmann <arnd@arndb.de>
Reviewed-by: NHannes Reinecke <hare@suse.de>
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>

Add functions for scsi host template scan_finished and scan_start
methods.
Signed-off-by: NJohn Garry <john.garry@huawei.com>
Reviewed-by: NArnd Bergmann <arnd@arndb.de>
Reviewed-by: NHannes Reinecke <hare@suse.de>
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>

Add support for smp function, which allows devices attached by expander
to be controlled.
Signed-off-by: NJohn Garry <john.garry@huawei.com>
Reviewed-by: NArnd Bergmann <arnd@arndb.de>
Reviewed-by: NHannes Reinecke <hare@suse.de>
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>

This is for expander broadcast event.
Signed-off-by: NJohn Garry <john.garry@huawei.com>
Reviewed-by: NArnd Bergmann <arnd@arndb.de>
Reviewed-by: NHannes Reinecke <hare@suse.de>
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>

Add abnormal irq handler. This handler is concerned with phy down event.
Also add port formed and port deformed handlers.
Signed-off-by: NJohn Garry <john.garry@huawei.com>
Reviewed-by: NArnd Bergmann <arnd@arndb.de>
Reviewed-by: NHannes Reinecke <hare@suse.de>
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>

Add functions to deal with lldd_dev_found and lldd_dev_gone.
Signed-off-by: NJohn Garry <john.garry@huawei.com>
Reviewed-by: NArnd Bergmann <arnd@arndb.de>
Reviewed-by: NHannes Reinecke <hare@suse.de>
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>

Add cq interrupt handler and also slot error handler function.
Signed-off-by: NJohn Garry <john.garry@huawei.com>
Reviewed-by: NArnd Bergmann <arnd@arndb.de>
Reviewed-by: NHannes Reinecke <hare@suse.de>
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>

Add path to send ssp command to HW.
Signed-off-by: NJohn Garry <john.garry@huawei.com>
Reviewed-by: NArnd Bergmann <arnd@arndb.de>
Reviewed-by: NHannes Reinecke <hare@suse.de>
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>

Signed-off-by: NJohn Garry <john.garry@huawei.com>
Reviewed-by: NArnd Bergmann <arnd@arndb.de>
Reviewed-by: NHannes Reinecke <hare@suse.de>
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>

Add code to interrupts, so now we can get a phy up interrupt when a disk
is connected.
Signed-off-by: NJohn Garry <john.garry@huawei.com>
Reviewed-by: NArnd Bergmann <arnd@arndb.de>
Reviewed-by: NHannes Reinecke <hare@suse.de>
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>

Signed-off-by: NJohn Garry <john.garry@huawei.com>
Reviewed-by: NArnd Bergmann <arnd@arndb.de>
Reviewed-by: NHannes Reinecke <hare@suse.de>
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>

Signed-off-by: NJohn Garry <john.garry@huawei.com>
Reviewed-by: NArnd Bergmann <arnd@arndb.de>
Reviewed-by: NHannes Reinecke <hare@suse.de>
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>

Add module init code for v1 hw.
Signed-off-by: NJohn Garry <john.garry@huawei.com>
Reviewed-by: NArnd Bergmann <arnd@arndb.de>
Reviewed-by: NHannes Reinecke <hare@suse.de>
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>

Signed-off-by: NJohn Garry <john.garry@huawei.com>
Reviewed-by: NArnd Bergmann <arnd@arndb.de>
Reviewed-by: NHannes Reinecke <hare@suse.de>
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>

Signed-off-by: NJohn Garry <john.garry@huawei.com>
Reviewed-by: NArnd Bergmann <arnd@arndb.de>
Reviewed-by: NHannes Reinecke <hare@suse.de>
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>

Include initialisation.
Signed-off-by: NJohn Garry <john.garry@huawei.com>
Reviewed-by: NArnd Bergmann <arnd@arndb.de>
Reviewed-by: NHannes Reinecke <hare@suse.de>
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>

Signed-off-by: NJohn Garry <john.garry@huawei.com>
Reviewed-by: NArnd Bergmann <arnd@arndb.de>
Reviewed-by: NHannes Reinecke <hare@suse.de>
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>

Signed-off-by: NJohn Garry <john.garry@huawei.com>
Reviewed-by: NArnd Bergmann <arnd@arndb.de>
Reviewed-by: NHannes Reinecke <hare@suse.de>
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>

The SAS address for the HBA comes from the device tree.
Signed-off-by: NJohn Garry <john.garry@huawei.com>
Reviewed-by: NArnd Bergmann <arnd@arndb.de>
Reviewed-by: NHannes Reinecke <hare@suse.de>
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>

Each completion queue has a structure. This is mainly for passing to irq
handler so we know which queue the irq occured on.
Signed-off-by: NJohn Garry <john.garry@huawei.com>
Reviewed-by: NArnd Bergmann <arnd@arndb.de>
Reviewed-by: NHannes Reinecke <hare@suse.de>
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>

Add functionality to init slot indexing.

Slot indexing is for the host to track which slots (or tags) are free
and which are used.
Signed-off-by: NJohn Garry <john.garry@huawei.com>
Reviewed-by: NArnd Bergmann <arnd@arndb.de>
Reviewed-by: NHannes Reinecke <hare@suse.de>
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>

This patch also includes relevant memory/pool freeing and sas/scsi host
removal.
Signed-off-by: NJohn Garry <john.garry@huawei.com>
Reviewed-by: NArnd Bergmann <arnd@arndb.de>
Reviewed-by: NHannes Reinecke <hare@suse.de>
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>

Allocate DMA and non-DMA memories for the controller. Also create DMA
pools.

These include:

- Delivery queues
- Completion queues
- Command status buffer
- Command table
- ITCT (For device context)
- Host slot info
- IO status
- Breakpoint
- host slot indexing
- SG data
- FIS
- interrupts names
Signed-off-by: NJohn Garry <john.garry@huawei.com>
Reviewed-by: NArnd Bergmann <arnd@arndb.de>
Reviewed-by: NHannes Reinecke <hare@suse.de>
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>

Signed-off-by: NJohn Garry <john.garry@huawei.com>
Reviewed-by: NArnd Bergmann <arnd@arndb.de>
Reviewed-by: NHannes Reinecke <hare@suse.de>
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>

Scan the device tree for all properties. Also do this:

- do ioremap for SAS registers
- allocate memory for interrupt names
Signed-off-by: NJohn Garry <john.garry@huawei.com>
Reviewed-by: NArnd Bergmann <arnd@arndb.de>
Reviewed-by: NHannes Reinecke <hare@suse.de>
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>

Add functionality to register device as a scsi host.

The SAS domain transport ops are empty at this point.
Signed-off-by: NJohn Garry <john.garry@huawei.com>
Reviewed-by: NArnd Bergmann <arnd@arndb.de>
Reviewed-by: NHannes Reinecke <hare@suse.de>
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>

This patch adds the initial bare main driver for the HiSilicon SAS
HBA. This only introduces the changes to build and load the main driver
module.

The complete driver consists of the core main module and also a module
platform driver for driving the hw.

The HBA is a platform device.
Signed-off-by: NJohn Garry <john.garry@huawei.com>
Signed-off-by: NZhangfei Gao <zhangfei.gao@linaro.org>
Reviewed-by: NArnd Bergmann <arnd@arndb.de>
Reviewed-by: NHannes Reinecke <hare@suse.de>
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>

Add devicetree bindings for HiSilicon SAS driver.
Signed-off-by: NJohn Garry <john.garry@huawei.com>
Signed-off-by: NZhangfei Gao <zhangfei.gao@linaro.org>
Acked-by: NRob Herring <robh@kernel.org>
Reviewed-by: NArnd Bergmann <arnd@arndb.de>
Reviewed-by: NHannes Reinecke <hare@suse.de>
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>

The xfer_rdy, command, and task frame's iu structures are not available
in <scsi/sas.h>, but only aic94xx driver folder.  Add them to
include/scsi/sas.h
Signed-off-by: NJohn Garry <john.garry@huawei.com>
Reviewed-by: NArnd Bergmann <arnd@arndb.de>
Reviewed-by: NHannes Reinecke <hare@suse.de>
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>

Move 870-specific init code to a separate function atp870_init()
Signed-off-by: NOndrej Zary <linux@rainbow-software.org>
Reviewed-by: NHannes Reinicke <hare@suse.de>
Acked-by: NChristoph Hellwig <hch@lst.de>
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>

Move 885-specific init code to a separate function atp885_init()
Signed-off-by: NOndrej Zary <linux@rainbow-software.org>
Reviewed-by: NHannes Reinicke <hare@suse.de>
Acked-by: NChristoph Hellwig <hch@lst.de>
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>

Move 880-specific init code to a separate function atp880_init()
Signed-off-by: NOndrej Zary <linux@rainbow-software.org>
Reviewed-by: NHannes Reinicke <hare@suse.de>
Acked-by: NChristoph Hellwig <hch@lst.de>
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>

Call _init_tables before chip-specific initialization. This avoids code
duplication and fixes a bug(?) in 880 init where the values read from flash
into atpdev->sp are then overwritten by calling init_tables.
Signed-off-by: NOndrej Zary <linux@rainbow-software.org>
Reviewed-by: NHannes Reinicke <hare@suse.de>
Acked-by: NChristoph Hellwig <hch@lst.de>
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>

scam_on is used only during probe, no need to keep it later.
Signed-off-by: NOndrej Zary <linux@rainbow-software.org>
Reviewed-by: NHannes Reinicke <hare@suse.de>
Acked-by: NChristoph Hellwig <hch@lst.de>
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>

Allocate IRQ later during probe to avoid code duplication and also
remove the need for weird locking in _probe.
(It was probably there to prevent race with the IRQ handler?)
Signed-off-by: NOndrej Zary <linux@rainbow-software.org>
Reviewed-by: NHannes Reinicke <hare@suse.de>
Acked-by: NChristoph Hellwig <hch@lst.de>
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>