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4cb00df87a
Provide the transport half of the bcmf FullMAC driver on RP2350, so that
boards carrying an Infineon CYW43439 (or the Raspberry Pi RM2 module that
houses one) can bring up a wlan0 interface. The chip's half-duplex gSPI bus
is driven by a six-instruction PIO program with DMA in both directions, and
the driver fills in the gspi_dev_t operations that bcmf_gspi_initialize()
expects.
This is a port of the equivalent rp2040 driver. Three differences in the
RP2350 hardware and its NuttX support had to be accounted for:
- The GPIO_STATUS register no longer has an OEFROMPERI field, so the wait
for the PIO program to release the shared data line watches OETOPAD
instead. No override is configured on that pad, so the two fields carry
the same value.
- rp23xx GPIO interrupt modes are enumerated as indices rather than as the
bitmask rp2040 uses, so passing the rp2040 constant would have selected
the wrong trigger.
- RP23XX_PIO_NUM is three, and the DREQ definitions live in
hardware/rp23xx_dreq.h.
The data and clock lines are also explicitly pulled down rather than left on
the reset default. The data line doubles as the chip's active-high interrupt
request and is serviced with a level-high interrupt, so it must read low
whenever the CYW43439 has released it.
Finally, the state machine returned by rp23xx_pio_claim_unused_sm() is
collected in a signed temporary before being stored, so that the "no state
machine available" test is not defeated by an unsigned comparison.
Assisted-by: Claude Code:claude-opus-5
Signed-off-by: Marco Casaroli <marco.casaroli@gmail.com>
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| arm | ||
| arm64 | ||
| avr | ||
| ceva | ||
| dummy | ||
| hc | ||
| mips | ||
| misoc | ||
| or1k | ||
| renesas | ||
| risc-v | ||
| sim | ||
| sparc | ||
| tricore | ||
| x86 | ||
| x86_64 | ||
| xtensa | ||
| z16 | ||
| z80 | ||
| CMakeLists.txt | ||
| Kconfig | ||