starfive-tech/opensbi.git/lib, branch debug

Add "snps,dw-apb-uart" in uart8250 driver.

2021-04-28T13:59:10+00:00

This patch add "snps,dw-apb-uart".compatible ID in uart8250 driver for StarFive VIC-7100. Signed-off-by: Tekkaman Ninja

include: headers: Replace ASSEMBLY with ASSEMBLER

2021-03-22T10:32:48+00:00

GCC has already a predefined macro __ASSEMBLER__ therefore, it can be used without the need to define a new flag with -D__ASSEMBLY__. This is useful when adding the library to projects having a build system such one can build without the need to make changes. THe build system does not use the Makefile in the sources tree. Signed-off-by: Marouene Boubakri Signed-off-by: Anup Patel

lib: sbi: illegal CSR 0x306 access in hpm_allowed()

2021-03-22T03:48:56+00:00

The trap handler sbi_emulate_csr_read() invokes hpm_allowed() which reads CSR 0x306 (mcounteren). The K210 does not support CSR 0x306. While trying to handle a trap occurring in S-mode code this creates an additional trap in M-mode. This results in failure to redirect to S-mode and the system hanging in sbi_hart_hang(). In hart_detect_features() we have already determined if CSR 0x306 is available and stored that information in the scratch area. We can use this information to decide if CSR 0x306 shall be accessed in hpm_allowed() and thus avoid the M-mode trap. Likewise if CSR scounteren is not available we have to avoid reading CSR 0x106. Signed-off-by: Heinrich Schuchardt Reviewed-by: Anup Patel

lib: Remove redundant sbi_platform_ipi_clear() calls

2021-03-03T08:24:50+00:00

The sbi_platform_ipi_clear() called from wait_for_coldboot() and sbi_hsm_hart_wait() is redundant because IPI will be automatically cleared by sbi_platform_ipi_init() called from sbi_ipi_init(). Further, wait_for_coldboot() is common for warm startup and warm resume path so the sbi_platform_ipi_clear() called in warm resume path cause resuming HART to miss an IPI injected other HART to wakeup the HART. Signed-off-by: Anup Patel Reviewed-by: Atish Patra

lib: sbi: Implement SBI HSM suspend function

2021-03-03T08:21:15+00:00

This patch implements the SBI HSM suspend function. Using this new SBI call, the S-mode software can put calling HART in platform specific suspend (i.e. low-power) state. For a successful retentive suspend, the SBI call will return without errors upon resuming whereas for a successful non-retentive suspend, the SBI call will resume from a user provided resume address. Signed-off-by: Anup Patel Reviewed-by: Atish Patra

lib: sbi: Add sbi_hart_reinit() function

2021-03-03T04:49:18+00:00

We add sbi_hart_reinit() function which will re-initialize HART CSRs assuming HART features are already detected. This new function will be useful in re-initializing HART after it resumes from HSM SUSPENDED state. Signed-off-by: Anup Patel Reviewed-by: Atish Patra

lib: sbi: Fix error codes returned by HSM start() and stop() functions

2021-03-03T04:49:01+00:00

The sbi_hsm_hart_start() and sbi_hsm_hart_stop() functions should only return error codes as defined by the SBI specification. Signed-off-by: Anup Patel Reviewed-by: Atish Patra

lib: sbi: Remove redundant sbi_hsm_hart_started() function

2021-03-03T04:48:23+00:00

The sbi_hsm_hart_started() function is only used by sbi_hsm_hart_stop() for checking state of calling HART and current domain assignment. The atomic_cmpxchg() called by sbi_hsm_hart_stop() will check state of calling hart anyway and domain assignment can be checked by other domain function such as sbi_domain_is_assigned_hart(). This means sbi_hsm_hart_started() is redundant and can be removed. Signed-off-by: Anup Patel Reviewed-by: Atish Patra

lib: sbi: Rename sbi_hsm_hart_started_mask() function

2021-03-03T04:47:45+00:00

A hart can take interrupt in the new HSM states introduced by the SBI HSM suspend function (such as SUSPENDED state) so we rename sbi_hsm_hart_started_mask() to something more generic such as sbi_hsm_hart_interruptible_mask(). Signed-off-by: Anup Patel Reviewed-by: Atish Patra

lib: sbi: Use SBI_HSM_STATE_xyz defines instead of SBI_STATE_xyz defines

2021-03-03T04:47:41+00:00

We replace the use of SBI_STATE_xyz defines with SBI_HSM_STATE_xyz defines because the HSM state defines are complete enough to implement HSM state machine in OpenSBI. As a result of this, we can now remove sbi_hsm_hart_state_to_status() function because it is now redundant and sbi_hsm_hart_get_state() can directly return HSM state or error. Signed-off-by: Anup Patel Reviewed-by: Atish Patra