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mailbox: zynqmp: support mulitple mboxes via device-tree

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As of now only one mailbox agent is supported by mailbox driver.
On zynqmp platform there are about 7 mailbox agents which can communicate
over same IPI channel to U-Boot. This patch series introduces new
"zynqmp_ipi_dest" driver which adds one to multi-channel mailbox
support.

Following format in device-tree is expected as per latest bindings:
zynqmp-ipi {
	compatible = "xlnx,zynqmp-ipi-mailbox";

	mbox_1: mailbox@1 {
		/* New compatible for child node */
		compatible = "xlnx,zynqmp-ipi-dest-mailbox";
		...
	};

	...

	mbox_n: mailbox@n {
		compatible = "xlnx,zynqmp-ipi-dest-mailbox";
		...
	}
};

Then mailbox client uses child mailbox node as following:

ipi-dest-1 {
	...
	mboxes = <mbox_1 0>, <mbox_1 1>;
	mbox-names = "tx", "rx";
	...
};

New "zynqmp_ipi_dest" driver is for devices with
"xlnx,zynqmp-ipi-dest-mailbox" compatible string. This driver will take care
of mailbox send recv ops and it replaces previous "zynqmp_ipi" driver.
Now "zynqmp_ipi" driver simply binds each child device with "zynqmp_ipi_dest"
driver.

However, its important to maintain backward comaptibility with previous
bindings where child node does not have compatible string. In such case, new
driver isn't probed by U-Boot during boot and system fails to boot. To
resolve this issue firmware-zynqmp.c driver probes all the IPI parent node
driver which binds each child node device with "zynqmp_ipi_dest" driver.

This makes sure corresponding child driver will be
probed when requested using mbox_get_by_name or mbox_get_by_idx
framework calls.

This way multiple mailbox agents are supported in device-tree without breaking
previous binding support.

Signed-off-by: Tanmay Shah <tanmay.shah@amd.com>
Link: https://lore.kernel.org/r/20231204215620.63334-4-tanmay.shah@amd.com
Signed-off-by: Michal Simek <michal.simek@amd.com>
This commit is contained in:
Tanmay Shah 2023-12-04 13:56:19 -08:00 committed by Michal Simek
parent e2c3e9c2b1
commit babee72ff6
2 changed files with 75 additions and 14 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

22
drivers/firmware/firmware-zynqmp.c
View file

@ -8,6 +8,7 @@
#include <common.h>
#include <cpu_func.h>
#include <dm.h>
#include <dm/device_compat.h>
#include <dm/lists.h>
#include <log.h>
#include <zynqmp_firmware.h>
@ -290,10 +291,31 @@ int zynqmp_pmufw_load_config_object(const void *cfg_obj, size_t size)
static int zynqmp_power_probe(struct udevice *dev)
{
struct udevice *ipi_dev;
ofnode ipi_node;
int ret;
debug("%s, (dev=%p)\n", __func__, dev);
/*
* Probe all IPI parent node driver. It is important to have IPI
* devices available when requested by mbox_get_by* API.
* If IPI device isn't available, then mailbox request fails and
* that causes system boot failure.
* To avoid this make sure all IPI parent drivers are probed here,
* and IPI parent driver binds each child node to mailbox driver.
* This way mbox_get_by_* API will have correct mailbox device
* driver probed.
*/
ofnode_for_each_compatible_node(ipi_node, "xlnx,zynqmp-ipi-mailbox") {
ret = uclass_get_device_by_ofnode(UCLASS_NOP, ipi_node, &ipi_dev);
if (ret) {
dev_err(dev, "failed to get IPI device from node %s\n",
ofnode_get_name(ipi_node));
return ret;
}
}
ret = mbox_get_by_name(dev, "tx", &zynqmp_power.tx_chan);
if (ret) {
debug("%s: Cannot find tx mailbox\n", __func__);

67
drivers/mailbox/zynqmp-ipi.c
View file

@ -12,6 +12,7 @@
#include <dm.h>
#include <mailbox-uclass.h>
#include <dm/device_compat.h>
#include <dm/lists.h>
#include <dm/of_access.h>
#include <linux/arm-smccc.h>
#include <linux/ioport.h>
@ -157,7 +158,7 @@ static int zynqmp_ipi_recv(struct mbox_chan *chan, void *data)
return ret;
};
static int zynqmp_ipi_probe(struct udevice *dev)
static int zynqmp_ipi_dest_probe(struct udevice *dev)
{
struct zynqmp_ipi *zynqmp = dev_get_priv(dev);
struct resource res;
@ -166,14 +167,12 @@ static int zynqmp_ipi_probe(struct udevice *dev)
debug("%s(dev=%p)\n", __func__, dev);
node = dev_ofnode(dev);
if (IS_ENABLED(CONFIG_SPL_BUILD) || of_machine_is_compatible("xlnx,zynqmp"))
zynqmp->el3_supported = true;
/* Get subnode where the regs are defined */
/* Note IPI mailbox node needs to be the first one in DT */
node = ofnode_first_subnode(dev_ofnode(dev));
ret = dev_read_u32(dev, "xlnx,ipi-id", &zynqmp->local_id);
ret = dev_read_u32(dev->parent, "xlnx,ipi-id", &zynqmp->local_id);
if (ret) {
dev_err(dev, "can't get local ipi id\n");
return ret;
@ -191,6 +190,8 @@ static int zynqmp_ipi_probe(struct udevice *dev)
};
zynqmp->local_req_regs = devm_ioremap(dev, res.start,
(res.start - res.end));
if (!zynqmp->local_req_regs)
return -EINVAL;
if (ofnode_read_resource_byname(node, "local_response_region", &res)) {
dev_err(dev, "No reg property for local_response_region\n");
@ -198,6 +199,8 @@ static int zynqmp_ipi_probe(struct udevice *dev)
};
zynqmp->local_res_regs = devm_ioremap(dev, res.start,
(res.start - res.end));
if (!zynqmp->local_res_regs)
return -EINVAL;
if (ofnode_read_resource_byname(node, "remote_request_region", &res)) {
dev_err(dev, "No reg property for remote_request_region\n");
@ -205,6 +208,8 @@ static int zynqmp_ipi_probe(struct udevice *dev)
};
zynqmp->remote_req_regs = devm_ioremap(dev, res.start,
(res.start - res.end));
if (!zynqmp->remote_req_regs)
return -EINVAL;
if (ofnode_read_resource_byname(node, "remote_response_region", &res)) {
dev_err(dev, "No reg property for remote_response_region\n");
@ -212,25 +217,59 @@ static int zynqmp_ipi_probe(struct udevice *dev)
};
zynqmp->remote_res_regs = devm_ioremap(dev, res.start,
(res.start - res.end));
if (!zynqmp->remote_res_regs)
return -EINVAL;
return 0;
};
static int zynqmp_ipi_probe(struct udevice *dev)
{
struct udevice *cdev;
ofnode cnode;
int ret;
debug("%s(dev=%p)\n", __func__, dev);
dev_for_each_subnode(cnode, dev) {
ret = device_bind_driver_to_node(dev, "zynqmp_ipi_dest",
ofnode_get_name(cnode),
cnode, &cdev);
if (ret)
return ret;
}
return 0;
};
struct mbox_ops zynqmp_ipi_dest_mbox_ops = {
.send = zynqmp_ipi_send,
.recv = zynqmp_ipi_recv,
};
static const struct udevice_id zynqmp_ipi_dest_ids[] = {
{ .compatible = "xlnx,zynqmp-ipi-dest-mailbox" },
{ }
};
U_BOOT_DRIVER(zynqmp_ipi_dest) = {
.name = "zynqmp_ipi_dest",
.id = UCLASS_MAILBOX,
.of_match = zynqmp_ipi_dest_ids,
.probe = zynqmp_ipi_dest_probe,
.priv_auto = sizeof(struct zynqmp_ipi),
.ops = &zynqmp_ipi_dest_mbox_ops,
};
static const struct udevice_id zynqmp_ipi_ids[] = {
{ .compatible = "xlnx,zynqmp-ipi-mailbox" },
{ }
};
struct mbox_ops zynqmp_ipi_mbox_ops = {
.send = zynqmp_ipi_send,
.recv = zynqmp_ipi_recv,
};
U_BOOT_DRIVER(zynqmp_ipi) = {
.name = "zynqmp_ipi",
.id = UCLASS_MAILBOX,
.id = UCLASS_NOP,
.of_match = zynqmp_ipi_ids,
.probe = zynqmp_ipi_probe,
.priv_auto = sizeof(struct zynqmp_ipi),
.ops = &zynqmp_ipi_mbox_ops,
.flags = DM_FLAG_PROBE_AFTER_BIND,
};