Den 05.05.2015 22:27, skrev Eric Anholt:
From: Lubomir Rintel <lkundrak@xxxxx>
This mailbox driver provides a single mailbox channel to write 32-bit
values to the VPU and get a 32-bit response. The Raspberry Pi
firmware uses this mailbox channel to implement firmware calls, while
Roku 2 (despite being derived from the same firmware tree) doesn't.
The driver was originally submitted by Lubomir, based on the
out-of-tree 2708 mailbox driver. Eric Anholt fixed it up for
upstreaming, with the major functional change being that it now has no
notion of multiple channels (since that is a firmware-dependent
concept) and instead the raspberrypi-firmware driver will do that
bit-twiddling in its own messages.
...
+static struct platform_driver bcm2835_mbox_driver = {
+ .driver = {
+ .name = "bcm2835-mbox",
+ .owner = THIS_MODULE,
+ .of_match_table = bcm2835_mbox_of_match,
+ },
+ .probe = bcm2835_mbox_probe,
+ .remove = bcm2835_mbox_remove,
+};
+module_platform_driver(bcm2835_mbox_driver);
I have tested this driver and the firmware driver booting directly
from the VideoCore bootloader (no uboot).
The mailbox driver loads too late to turn on USB power:
[ 0.754258] platform soc:firmware: Driver raspberrypi-firmware
requests probe deferral
[ 2.041136] dwc2 20980000.usb: 256 invalid for
host_nperio_tx_fifo_size. Check HW configuration.
[ 2.050058] dwc2 20980000.usb: 512 invalid for
host_perio_tx_fifo_size. Check HW configuration.
[ 4.140894] dwc2 20980000.usb: dwc2_core_reset() HANG! Soft Reset
GRSTCTL=80000001
[ 4.148583] dwc2 20980000.usb: dwc2_core_init(): Reset failed, aborting
[ 4.155281] dwc2 20980000.usb: dwc2_hcd_init() FAILED, returning -16
[ 4.161720] dwc2: probe of 20980000.usb failed with error -16
[ 4.272027] bcm2835-mbox 2000b880.mailbox: mailbox enabled
When I move mailbox module init to arch_initcall, USB power is turned on.
[ 0.548481] bcm2835-mbox 2000b880.mailbox: mailbox enabled
[ 1.733669] raspberrypi_firmware_set_power *** I have added this
[ 2.242699] USB: Power-on latency exceeded, new value 509026000 ns
[ 3.109748] dwc2 20980000.usb: DWC OTG Controller
[ 3.114690] dwc2 20980000.usb: new USB bus registered, assigned bus
number 1
[ 3.121890] dwc2 20980000.usb: irq 33, io mem 0x00000000
This silences the warning:
struct raspberrypi_power_domain raspberrypi_power_domain_usb = {
.base = {
.power_on_latency_ns = 600000000,
Noralf.
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