GitLab

Clock enable EEMI API is reimplemented to use system-level clock
and pll EEMI APIs rather than direct MMIO read/write accesses to clock
and pll control registers.
Since linux still uses clock enable API to trigger locking of the PLLs
in the pm_clock_enable() implementation we need to workaround this by
distinguishing two cases: 1) if the given clock ID corresponds to a PLL
output clock ID; or 2) given clock ID is truly an on-chip clock that can
be gated.
For case 1) we'll call pm_api_clock_pll_enable() implemented in
pm_api_clock.h/c. This function checks what is the buffered PLL mode and
calls the system-level PLL set mode EEMI API with the buffered mode value
specified as argument. Long term, if linux driver get fixed to use PLL
EEMI API to control PLLs, this case could be removed from ATF.
For case 2) we'll call the PMU to configure the clock gate. This is done
using system-level clock enable EEMI API.
Signed-off-by: Mirela Simonovic <mirela.simonovic@aggios.com>
Acked-by: Will Wong <WILLW@xilinx.com>
Signed-off-by: Jolly Shah <jollys@xilinx.com>

When linux calls pm_ioctl_get_pll_frac_mode() it doesn't expect the actual
mode to be read from hardware, but the value that it is intending to
program. Therefore, we return the buffered value to linux.
Signed-off-by: Mirela Simonovic <mirela.simonovic@aggios.com>
Acked-by: Will Wong <WILLW@xilinx.com>
Signed-off-by: Jolly Shah <jollys@xilinx.com>

When linux calls pm_ioctl_set_pll_frac_mode() it doesn't expect the
fractional mode to be changed in hardware. Furthermore, even before this
patch setting the mode which is done by writing into register takes
no effect until the PLL reset is deasserted, i.e. until linux "enables"
the PLL. To adjust the code to system-level PLL EEMI API and avoid
unnecessary IPIs that would otherwise be issued, we buffer the mode
value set via IOCTL until the PLL mode really needs to be set.
Signed-off-by: Mirela Simonovic <mirela.simonovic@aggios.com>
Acked-by: Will Wong <WILLW@xilinx.com>
Signed-off-by: Jolly Shah <jollys@xilinx.com>

Fractional data should be set using PLL set parameter EEMI API. This
stands for system-level communication (APU to PMU). Since linux
already uses a specific IOCTL function to do this and we need to
keep it that way, the pll clock ID given by linux has to be mapped
to the pll node ID that is communicated at the system-level (argument
of PLL set parameter API).
With this modification the function pm_api_clk_set_pll_frac_data is
removed from pm_api_clock.c/h because it became unused.
Signed-off-by: Mirela Simonovic <mirela.simonovic@aggios.com>
Acked-by: Will Wong <WILLW@xilinx.com>
Signed-off-by: Jolly Shah <jollys@xilinx.com>

Fractional data should be get using PLL get parameter EEMI API. This
stands for system-level communication (APU to PMU). Since linux
already uses a specific IOCTL function to do this and we need to
keep it that way, the pll clock ID given by linux has to be mapped
to the pll node ID that is communicated at the system-level (argument
of PLL get parameter API).
With this modification the function pm_api_clk_get_pll_frac_data is
removed from pm_api_clock.c/h because it became unused.
The clock enum is defined as 'enum clock_id'.
Signed-off-by: Mirela Simonovic <mirela.simonovic@aggios.com>
Acked-by: Will Wong <WILLW@xilinx.com>
Signed-off-by: Jolly Shah <jollys@xilinx.com>

All identifiers, regardless of use, that start with two underscores are
reserved. This means they can't be used in header guards.

The style that this project is now to use the full name of the file in
capital letters followed by 'H'. For example, for a file called
"uart_example.h", the header guard is UART_EXAMPLE_H.

The exceptions are files that are imported from other projects:

- CryptoCell driver
- dt-bindings folders
- zlib headers

Change-Id: I50561bf6c88b491ec440d0c8385c74650f3c106e
Signed-off-by: Antonio Nino Diaz <antonio.ninodiaz@arm.com>

Currently in Linux maximum number of clocks is hard-coded and
so it needs to allocate static memory. It can get actual clock
number after querying all clock names by special clock name
string. Add new query data parameter to get actual number of
clocks so Linux can get actual clock numbers in advance.
Signed-off-by: Rajan Vaja <rajan.vaja@xilinx.com>

Various changes to comply with MISRA static analysis rules
Signed-off-by: Jolly Shah <jollys@xilinx.com>

- Add clock entries and information to clock database.
- Implement APIs to provide clock topology and other
  information to caller.
- Implement APIs to control clocks and PLLs.
Signed-off-by: Rajan Vaja <rajanv@xilinx.com>
Signed-off-by: Jolly Shah <jollys@xilinx.com>

These are empty functions with no logic right now. Code
will be added in subsequent commits.
Signed-off-by: Rajan Vaja <rajanv@xilinx.com>
Signed-off-by: Jolly Shah <jollys@xilinx.com>