The fdt_addr_t and phys_addr_t size have been decoupled.
A 32bit CPU can expect 64-bit data from the device tree parser,
so use devfdt_get_addr_index_ptr and devfdt_get_addr_size_index_ptr
function in the spi-aspeed-smc.c file. Also fix dev_dbg to be able
to handle both sizes. As we are there also streamline the error
response to -EINVAL on return.
Signed-off-by: Johan Jonker <jbx6244@gmail.com>
Reviewed-by: Michael Trimarchi <michael@amarulasolutions.com>
Fix some typos in spi drivers
Signed-off-by: Pengfei Fan <fanpengfei1@eswincomputing.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Jagan Teki <jagan@amarulasolutions.com>
Driver can configure the SPI clock frequnecy to the
target value of "spi-max-frequency" property in
the device tree. The frequency is divided from HCLK,
200MHz. Usually, the ASPEED SPI clock frequency range
is between 12.5MHz and 100MHz. On AST2600, the lowest
SPI clock frequency can be about 780kHz.
Signed-off-by: Chin-Ting Kuo <chin-ting_kuo@aspeedtech.com>
If "decoded-ranges" is defined in the device tree, the
driver will apply the decoded address ranges from this
property to the controller during probe stage.
This patch refers to the following OpenBMC u-boot patch.
https://patchwork.ozlabs.org/project/openbmc/list/?series=306969
Signed-off-by: Chin-Ting Kuo <chin-ting_kuo@aspeedtech.com>
There are some known HW problems about decoded
range register configurations on existing AST2500 and
AST2600 platforms. Additional callback function,
adjust_decoded_sz, is added to solve these problems
on each platform. Besides, aspeed_spi_trim_decoded_size
function is added to modify overall decoded address
size for fitting the maximum AHB decoded size.
Signed-off-by: Chin-Ting Kuo <chin-ting_kuo@aspeedtech.com>
From the HW point of view, the performance of
command read mode is greater than user mode slightly.
Thus, dirmap read framework is introduced to achieve
this goal. In dirmap_create, command read mode is
configured. Usually, the decoded address area with flash
size is assigned to each CS. CPU can thus access the
SPI flash as normal memory in dirmap_read function.
Signed-off-by: Chin-Ting Kuo <chin-ting_kuo@aspeedtech.com>
Although AST2400 is EOL officially, in order to achieve
sustainability and completeness, AST2400 part is added.
For AST2400,
- Five CSs are supported by FMC controller.
- SPI1 controller only supports single CS and there is
no address segment address register. The CE control
register of SPI1 is located at the offset 0x04 and
the 4-byte address mode control bit is bit 13 of
this register.
Signed-off-by: Chin-Ting Kuo <chin-ting_kuo@aspeedtech.com>
Add ASPEED BMC FMC/SPI memory controller driver with
spi-mem interface for AST2500 and AST2600 platform.
There are three SPI memory controllers embedded in an ASPEED SoC.
- FMC: Named as Firmware Memory Controller. After AC on, MCU ROM
fetches initial device boot image from FMC chip select(CS) 0.
- SPI1: Play the role of a SPI Master controller. Or, there is a
dedicated path for HOST(X86) to access its BIOS flash mounted
under BMC. spi-aspeed-smc.c implements the control sequence when
SPI1 is a SPI master.
- SPI2: It is a pure SPI flash controller. For most scenarios, flashes
mounted under it are for pure storage purpose.
ASPEED SPI controller supports 1-1-1, 1-1-2 and 1-1-4 SPI flash mode.
Three types of command mode are supported, normal mode, command
read/write mode and user mode.
- Normal mode: Default mode. After power on, normal read command 03h or
13h is used to fetch boot image from SPI flash.
- AST2500: Only 03h command can be used after power on
or reset.
- AST2600: If FMC04[6:4] is set, 13h command is used,
otherwise, 03h command.
The address length is decided by FMC04[2:0].
- Command mode: SPI controller can send command and address
automatically when CPU read/write the related remapped
or decoded address area. The command used by this mode
can be configured by FMC10/14/18[23:16]. Also, the
address length is decided by FMC04[2:0]. This mode will
be implemented in the following patch series.
- User mode: It is a traditional and pure SPI operation, where
SPI transmission is controlled by CPU. It is the main
mode in this patch.
Each SPI controller in ASPEED SoC has its own decoded address mapping.
Within each SPI controller decoded address, driver can assign a specific
address region for each CS of a SPI controller. The decoded address
cannot overlap to each other. With normal mode and command mode, the
decoded address accessed by the CPU determines which CS is active.
When user mode is adopted, the CS decoded address is a FIFO, CPU can
send/receive any SPI transmission by accessing the related decoded
address for the target CS.
This patch only implements user mode initially. Command read/write
mode will be implemented in the following patches.
Signed-off-by: Chin-Ting Kuo <chin-ting_kuo@aspeedtech.com>
