This patch adds a set of functions to enable the clock for each of the
watchdog IP blocks.
Unlike the MMC and UART blocks, the watchdog blocks operate off of the one
root clock, only the clock-gates are enable/disabled individually.
As a consequence the function clock_set_wdog_clk_root_bits() is used to set
the root-slice just once for all of the watchdog blocks.
Future implementations may need to change this model but for now on the one
supported processor and similar NXP SoCs this model should work fine.
Signed-off-by: Bryan O'Donoghue <bryan.odonoghue@linaro.org>
This patch adds an API to configure up the base USDHC clocks, taking a
bit-mask of silicon specific bits as an input from a higher layer in order
to direct the necessary clock source.
Signed-off-by: Jun Nie <jun.nie@linaro.org>
Signed-off-by: Bryan O'Donoghue <bryan.odonoghue@linaro.org>
This patch adds an API to configure up the base UART clocks, taking a
bit-mask of silicon specific bits as an input from a higher layer in order
to direct the necessary clock source.
Signed-off-by: Bryan O'Donoghue <bryan.odonoghue@linaro.org>
This commit:
- Defines a clock stub with a conjoined header defining the clock
memory map.
- Defines the CCM Clock Gating Register which comes in a quadrumvirate
register set to read, set, clear and toggle individual clock gates into
one of four states based bitmask.
00: Domain clocks not needed
01: Domain clocks needed when in RUN
10: Domain clocks needed when in RUN and WAIT
11: Domain clocks needed all the time
- Defines clock control register bits
There are various quadrumvirate register blocks target-root, misc-root,
post-root, pre-root in the CCM.
The number of registers is huge but the four registers in each
quadrumvirate block contain the same bits, so the number of bit
definitions is actually quite low.
- Defines clock identifiers
An array of clock gates is provided in the CCM block. In order to index
that array and thus enable/disable clock gates for the right components,
we need to provide meaningful names to the indices.
Section 5.2.5 of the i.MX7 Solo Application Processor Reference Manual
Rev 0.1 provides the relevant details.
- Defines target mux select bits
This is a comprehensive definition of the target clock mux select bits.
These bits are required to correctly select the clock source. Defining
all of the bits up-front even for unused blocks in ATF means we can
switch on any block we want at a later date without having to write new
code in the clock-mux layer.
- Defines identifier indices into root-slice array
The root-slice array of control registers has a specific set of indices,
which differ from the clock-gate indices.
- Provides a clock gate enable/disable routine
Provides a clock-gate enable/disable routine via the set/clr
registers in a given clock-gate control register block.
This index passed should be one of the enums associated with CCM and
depending on enable/disable being passed either set or clr will be
written to.
The Domain0 bits are currently the only bits targeted by this write, more
work may need to be done on the domain bits in subsequent patches as a
result.
- imx: Adds set/clr routines to clock layer
Adds a set and clr routine to the clock layer. These routines allow us to
access the set and clear registers of the "target" block registers. These
are the registers where we select the clock source from the available list.
Signed-off-by: Bryan O'Donoghue <bryan.odonoghue@linaro.org>
Bryan O'Donoghue
Jun Nie