opensbi.git/lib/utils, branch v1.0

lib: pmu: support the event ID encoded by a bitmap.

2021-12-03T04:07:03Z

RISC-V privilege specification does not specify how to encode the event ID. Therefore, each platform is allowed to customize its own encoding rule. The common encoding methods are as follow, directly assigning a number to an event, or every bit in the mphmevent CSR controls one specified event or mixes the above two methods. To enable OpenSBI to support the above three encoding methods simultaneously, this patch repurpose the dt property "riscv,raw-event-to-mhpmcounters". The "riscv,raw-event-to-mhpmcounters" will describes the one or multiple raw events that could be counted by a set of counters. But, the column number of "riscv,raw-event-to-mhpmcounters" is extended from 2 to 3. The 1st column (64bit) is the ID of the raw events. The 2nd column (64bit) represents a select_mask now to represent the bits used for event ID encoding. If a platform directly encodes each raw PMU event as a unique ID, the value of select_mask will be 0xffffffff_ffffffff. Signed-off-by: Vincent Chen Signed-off-by: Atish Patra Reviewed-by: Anup Patel

lib: utils: Add LiteX UART support

2021-11-18T07:52:02Z

Add support for the UART provided by the LiteX SoC framework (https://github.com/enjoy-digital/litex), based on its FDT info (described in the Linux tree at Documentation/devicetree/bindings/serial/litex,liteuart.yaml). Signed-off-by: Gabriel Somlo Reviewed-by: Xiang W Reviewed-by: Anup Patel

lib: utils/i2c: Add minimal SiFive I2C driver

2021-11-12T04:59:08Z

Minimum SiFive I2C driver to read/send bytes over I2C bus. This allows querying information and perform operation of onboard PMIC, as well as power-off and reset. Tested-by: Heinrich Schuchardt Reviewed-by: Alexandre Ghiti Tested-by: Alexandre Ghiti Signed-off-by: Nikita Shubin

lib: utils/i2c: Add simple FDT based I2C framework

2021-11-12T04:49:45Z

FDT based I2C framework on the top of I2C library. The drivers are probed on demand by fdt_i2c_adapter_get function. Tested-by: Heinrich Schuchardt Reviewed-by: Alexandre Ghiti Tested-by: Alexandre Ghiti Signed-off-by: Nikita Shubin

lib: utils/i2c: Add generic I2C configuration library

2021-11-12T04:47:50Z

Helper library to keep track of registered I2C adapters, identified by dts offset, basic send/read functions and adapter configuration (enable, set dividers, etc...). Tested-by: Heinrich Schuchardt Reviewed-by: Alexandre Ghiti Tested-by: Alexandre Ghiti Signed-off-by: Nikita Shubin

lib: utils/reset: separate driver init func

2021-11-12T04:46:23Z

Move driver init code to separate function, so it can be reused elsewhere. Tested-by: Heinrich Schuchardt Reviewed-by: Alexandre Ghiti Tested-by: Alexandre Ghiti Signed-off-by: Nikita Shubin

lib: utils/reset: add priority to gpio reset

2021-11-12T04:45:54Z

Make gpio_system_reset_check return priority instead of just true/false. Make default 128 priority for reset/shutdown. Tested-by: Heinrich Schuchardt Reviewed-by: Alexandre Ghiti Tested-by: Alexandre Ghiti Signed-off-by: Nikita Shubin

lib: utils: Rename the prefix in PMU DT properties

2021-11-11T12:24:46Z

As per the DT schema rules, the prefix should be vendor. As the PMU properties are generic for all vendors, change the prefix to riscv instead of pmu. Reviewed-by: Anup Patel Reviewed-by: Bin Meng Signed-off-by: Atish Patra

lib: sbi: Enable PMU extension for platforms without mcountinhibit

2021-11-11T12:24:01Z

Some platforms such as hifive unmatched doesn't implement mcountinhibit csr. However, it has hardware events that can be monitored using 2 hpmcounter it has (i.e. mhpmcounter3 & mhpmcounter4). Currently, PMU extension disabled if mcountinhibit is absent. That's not really necessary as long as the supervisor OS keeps track of the delta value of the counters. Without mcountinhibit, the delta value won't be entirely accurate because the counters are freely running. However, that should be fine to produce an approximate counter value which can help performance analysis. Perf sampling won't work though as sscof extension is not present in hifive unmatched. Reviewed-by: Anup Patel Reviewed-by: Bin Meng Signed-off-by: Atish Patra

lib: sbi: error handling in fdt_reset_init()

2021-11-08T05:20:48Z

The initialization of a reset driver may fail for various reasons, like a PMIC based reset driver not finding the required I2C driver. The return code of the init routine may take other error values than -ENODEV. If the initialization of a reset driver fails, this should not lead to the board hanging. It is enough that the reset driver does not call sbi_system_reset_add_device() to avoid invoking the driver for a device that could not be initialized. Change the return type of fdt_reset_init() to void. Print a message if an error occurs. Signed-off-by: Heinrich Schuchardt Reviewed-by: Dong Du Reviewed-by: Anup Patel