u-boot/drivers/misc/tegra186_bpmp.c
Tom Rini 83d290c56f SPDX: Convert all of our single license tags to Linux Kernel style
When U-Boot started using SPDX tags we were among the early adopters and
there weren't a lot of other examples to borrow from.  So we picked the
area of the file that usually had a full license text and replaced it
with an appropriate SPDX-License-Identifier: entry.  Since then, the
Linux Kernel has adopted SPDX tags and they place it as the very first
line in a file (except where shebangs are used, then it's second line)
and with slightly different comment styles than us.

In part due to community overlap, in part due to better tag visibility
and in part for other minor reasons, switch over to that style.

This commit changes all instances where we have a single declared
license in the tag as both the before and after are identical in tag
contents.  There's also a few places where I found we did not have a tag
and have introduced one.

Signed-off-by: Tom Rini <trini@konsulko.com>
2018-05-07 09:34:12 -04:00

256 lines
5.8 KiB
C

// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (c) 2016, NVIDIA CORPORATION.
*/
#include <common.h>
#include <dm.h>
#include <dm/lists.h>
#include <dm/root.h>
#include <mailbox.h>
#include <misc.h>
#include <asm/arch-tegra/bpmp_abi.h>
#include <asm/arch-tegra/ivc.h>
#define BPMP_IVC_FRAME_COUNT 1
#define BPMP_IVC_FRAME_SIZE 128
#define BPMP_FLAG_DO_ACK BIT(0)
#define BPMP_FLAG_RING_DOORBELL BIT(1)
DECLARE_GLOBAL_DATA_PTR;
struct tegra186_bpmp {
struct mbox_chan mbox;
struct tegra_ivc ivc;
};
static int tegra186_bpmp_call(struct udevice *dev, int mrq, void *tx_msg,
int tx_size, void *rx_msg, int rx_size)
{
struct tegra186_bpmp *priv = dev_get_priv(dev);
int ret, err;
void *ivc_frame;
struct mrq_request *req;
struct mrq_response *resp;
ulong start_time;
debug("%s(dev=%p, mrq=%u, tx_msg=%p, tx_size=%d, rx_msg=%p, rx_size=%d) (priv=%p)\n",
__func__, dev, mrq, tx_msg, tx_size, rx_msg, rx_size, priv);
if ((tx_size > BPMP_IVC_FRAME_SIZE) || (rx_size > BPMP_IVC_FRAME_SIZE))
return -EINVAL;
ret = tegra_ivc_write_get_next_frame(&priv->ivc, &ivc_frame);
if (ret) {
pr_err("tegra_ivc_write_get_next_frame() failed: %d\n", ret);
return ret;
}
req = ivc_frame;
req->mrq = mrq;
req->flags = BPMP_FLAG_DO_ACK | BPMP_FLAG_RING_DOORBELL;
memcpy(req + 1, tx_msg, tx_size);
ret = tegra_ivc_write_advance(&priv->ivc);
if (ret) {
pr_err("tegra_ivc_write_advance() failed: %d\n", ret);
return ret;
}
start_time = timer_get_us();
for (;;) {
ret = tegra_ivc_channel_notified(&priv->ivc);
if (ret) {
pr_err("tegra_ivc_channel_notified() failed: %d\n", ret);
return ret;
}
ret = tegra_ivc_read_get_next_frame(&priv->ivc, &ivc_frame);
if (!ret)
break;
/* Timeout 20ms; roughly 10x current max observed duration */
if ((timer_get_us() - start_time) > 20 * 1000) {
pr_err("tegra_ivc_read_get_next_frame() timed out (%d)\n",
ret);
return -ETIMEDOUT;
}
}
resp = ivc_frame;
err = resp->err;
if (!err && rx_msg && rx_size)
memcpy(rx_msg, resp + 1, rx_size);
ret = tegra_ivc_read_advance(&priv->ivc);
if (ret) {
pr_err("tegra_ivc_write_advance() failed: %d\n", ret);
return ret;
}
if (err) {
pr_err("BPMP responded with error %d\n", err);
/* err isn't a U-Boot error code, so don't that */
return -EIO;
}
return rx_size;
}
/**
* The BPMP exposes multiple different services. We create a sub-device for
* each separate type of service, since each device must be of the appropriate
* UCLASS.
*/
static int tegra186_bpmp_bind(struct udevice *dev)
{
int ret;
struct udevice *child;
debug("%s(dev=%p)\n", __func__, dev);
ret = device_bind_driver_to_node(dev, "tegra186_clk", "tegra186_clk",
dev_ofnode(dev), &child);
if (ret)
return ret;
ret = device_bind_driver_to_node(dev, "tegra186_reset",
"tegra186_reset", dev_ofnode(dev),
&child);
if (ret)
return ret;
ret = device_bind_driver_to_node(dev, "tegra186_power_domain",
"tegra186_power_domain",
dev_ofnode(dev), &child);
if (ret)
return ret;
ret = dm_scan_fdt_dev(dev);
if (ret)
return ret;
return 0;
}
static ulong tegra186_bpmp_get_shmem(struct udevice *dev, int index)
{
int ret;
struct fdtdec_phandle_args args;
fdt_addr_t reg;
ret = fdtdec_parse_phandle_with_args(gd->fdt_blob, dev_of_offset(dev),
"shmem", NULL, 0, index, &args);
if (ret < 0) {
pr_err("fdtdec_parse_phandle_with_args() failed: %d\n", ret);
return ret;
}
reg = fdtdec_get_addr_size_auto_noparent(gd->fdt_blob, args.node,
"reg", 0, NULL, true);
if (reg == FDT_ADDR_T_NONE) {
pr_err("fdtdec_get_addr_size_auto_noparent() failed\n");
return -ENODEV;
}
return reg;
}
static void tegra186_bpmp_ivc_notify(struct tegra_ivc *ivc)
{
struct tegra186_bpmp *priv =
container_of(ivc, struct tegra186_bpmp, ivc);
int ret;
ret = mbox_send(&priv->mbox, NULL);
if (ret)
pr_err("mbox_send() failed: %d\n", ret);
}
static int tegra186_bpmp_probe(struct udevice *dev)
{
struct tegra186_bpmp *priv = dev_get_priv(dev);
int ret;
ulong tx_base, rx_base, start_time;
debug("%s(dev=%p) (priv=%p)\n", __func__, dev, priv);
ret = mbox_get_by_index(dev, 0, &priv->mbox);
if (ret) {
pr_err("mbox_get_by_index() failed: %d\n", ret);
return ret;
}
tx_base = tegra186_bpmp_get_shmem(dev, 0);
if (IS_ERR_VALUE(tx_base)) {
pr_err("tegra186_bpmp_get_shmem failed for tx_base\n");
return tx_base;
}
rx_base = tegra186_bpmp_get_shmem(dev, 1);
if (IS_ERR_VALUE(rx_base)) {
pr_err("tegra186_bpmp_get_shmem failed for rx_base\n");
return rx_base;
}
debug("shmem: rx=%lx, tx=%lx\n", rx_base, tx_base);
ret = tegra_ivc_init(&priv->ivc, rx_base, tx_base, BPMP_IVC_FRAME_COUNT,
BPMP_IVC_FRAME_SIZE, tegra186_bpmp_ivc_notify);
if (ret) {
pr_err("tegra_ivc_init() failed: %d\n", ret);
return ret;
}
tegra_ivc_channel_reset(&priv->ivc);
start_time = timer_get_us();
for (;;) {
ret = tegra_ivc_channel_notified(&priv->ivc);
if (!ret)
break;
/* Timeout 100ms */
if ((timer_get_us() - start_time) > 100 * 1000) {
pr_err("Initial IVC reset timed out (%d)\n", ret);
ret = -ETIMEDOUT;
goto err_free_mbox;
}
}
return 0;
err_free_mbox:
mbox_free(&priv->mbox);
return ret;
}
static int tegra186_bpmp_remove(struct udevice *dev)
{
struct tegra186_bpmp *priv = dev_get_priv(dev);
debug("%s(dev=%p) (priv=%p)\n", __func__, dev, priv);
mbox_free(&priv->mbox);
return 0;
}
static struct misc_ops tegra186_bpmp_ops = {
.call = tegra186_bpmp_call,
};
static const struct udevice_id tegra186_bpmp_ids[] = {
{ .compatible = "nvidia,tegra186-bpmp" },
{ }
};
U_BOOT_DRIVER(tegra186_bpmp) = {
.name = "tegra186_bpmp",
.id = UCLASS_MISC,
.of_match = tegra186_bpmp_ids,
.bind = tegra186_bpmp_bind,
.probe = tegra186_bpmp_probe,
.remove = tegra186_bpmp_remove,
.ops = &tegra186_bpmp_ops,
.priv_auto_alloc_size = sizeof(struct tegra186_bpmp),
};