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/*
* Copyright (c) 2016, NVIDIA CORPORATION.
*
* SPDX-License-Identifier: GPL-2.0
*/
#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) {
error("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) {
error("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) {
error("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) {
error("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) {
error("tegra_ivc_write_advance() failed: %d\n", ret);
return ret;
}
if (err) {
error("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_of_offset(dev), &child);
if (ret)
return ret;
ret = device_bind_driver_to_node(dev, "tegra186_reset",
"tegra186_reset", dev_of_offset(dev),
&child);
if (ret)
return ret;
ret = device_bind_driver_to_node(dev, "tegra186_power_domain",
"tegra186_power_domain",
dev_of_offset(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) {
error("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) {
error("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)
error("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) {
error("mbox_get_by_index() failed: %d\n", ret);
return ret;
}
tx_base = tegra186_bpmp_get_shmem(dev, 0);
if (IS_ERR_VALUE(tx_base)) {
error("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)) {
error("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) {
error("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) {
error("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),
};
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