1 // SPDX-License-Identifier: GPL-2.0
3 * Copyright (c) 2016, NVIDIA CORPORATION.
15 #include <asm/arch-tegra/bpmp_abi.h>
16 #include <asm/arch-tegra/ivc.h>
17 #include <linux/bitops.h>
18 #include <linux/err.h>
20 #define BPMP_IVC_FRAME_COUNT 1
21 #define BPMP_IVC_FRAME_SIZE 128
23 #define BPMP_FLAG_DO_ACK BIT(0)
24 #define BPMP_FLAG_RING_DOORBELL BIT(1)
26 DECLARE_GLOBAL_DATA_PTR;
28 struct tegra186_bpmp {
29 struct mbox_chan mbox;
33 static int tegra186_bpmp_call(struct udevice *dev, int mrq, void *tx_msg,
34 int tx_size, void *rx_msg, int rx_size)
36 struct tegra186_bpmp *priv = dev_get_priv(dev);
39 struct mrq_request *req;
40 struct mrq_response *resp;
43 debug("%s(dev=%p, mrq=%u, tx_msg=%p, tx_size=%d, rx_msg=%p, rx_size=%d) (priv=%p)\n",
44 __func__, dev, mrq, tx_msg, tx_size, rx_msg, rx_size, priv);
46 if ((tx_size > BPMP_IVC_FRAME_SIZE) || (rx_size > BPMP_IVC_FRAME_SIZE))
49 ret = tegra_ivc_write_get_next_frame(&priv->ivc, &ivc_frame);
51 pr_err("tegra_ivc_write_get_next_frame() failed: %d\n", ret);
57 req->flags = BPMP_FLAG_DO_ACK | BPMP_FLAG_RING_DOORBELL;
58 memcpy(req + 1, tx_msg, tx_size);
60 ret = tegra_ivc_write_advance(&priv->ivc);
62 pr_err("tegra_ivc_write_advance() failed: %d\n", ret);
66 start_time = timer_get_us();
68 ret = tegra_ivc_channel_notified(&priv->ivc);
70 pr_err("tegra_ivc_channel_notified() failed: %d\n", ret);
74 ret = tegra_ivc_read_get_next_frame(&priv->ivc, &ivc_frame);
78 /* Timeout 20ms; roughly 10x current max observed duration */
79 if ((timer_get_us() - start_time) > 20 * 1000) {
80 pr_err("tegra_ivc_read_get_next_frame() timed out (%d)\n",
88 if (!err && rx_msg && rx_size)
89 memcpy(rx_msg, resp + 1, rx_size);
91 ret = tegra_ivc_read_advance(&priv->ivc);
93 pr_err("tegra_ivc_write_advance() failed: %d\n", ret);
98 pr_err("BPMP responded with error %d\n", err);
99 /* err isn't a U-Boot error code, so don't that */
107 * The BPMP exposes multiple different services. We create a sub-device for
108 * each separate type of service, since each device must be of the appropriate
111 static int tegra186_bpmp_bind(struct udevice *dev)
114 struct udevice *child;
116 debug("%s(dev=%p)\n", __func__, dev);
118 ret = device_bind_driver_to_node(dev, "tegra186_clk", "tegra186_clk",
119 dev_ofnode(dev), &child);
123 ret = device_bind_driver_to_node(dev, "tegra186_reset",
124 "tegra186_reset", dev_ofnode(dev),
129 ret = device_bind_driver_to_node(dev, "tegra186_power_domain",
130 "tegra186_power_domain",
131 dev_ofnode(dev), &child);
135 ret = dm_scan_fdt_dev(dev);
142 static ulong tegra186_bpmp_get_shmem(struct udevice *dev, int index)
145 struct fdtdec_phandle_args args;
148 ret = fdtdec_parse_phandle_with_args(gd->fdt_blob, dev_of_offset(dev),
149 "shmem", NULL, 0, index, &args);
151 pr_err("fdtdec_parse_phandle_with_args() failed: %d\n", ret);
155 reg = fdtdec_get_addr_size_auto_noparent(gd->fdt_blob, args.node,
156 "reg", 0, NULL, true);
157 if (reg == FDT_ADDR_T_NONE) {
158 pr_err("fdtdec_get_addr_size_auto_noparent() failed\n");
165 static void tegra186_bpmp_ivc_notify(struct tegra_ivc *ivc)
167 struct tegra186_bpmp *priv =
168 container_of(ivc, struct tegra186_bpmp, ivc);
171 ret = mbox_send(&priv->mbox, NULL);
173 pr_err("mbox_send() failed: %d\n", ret);
176 static int tegra186_bpmp_probe(struct udevice *dev)
178 struct tegra186_bpmp *priv = dev_get_priv(dev);
180 ulong tx_base, rx_base, start_time;
182 debug("%s(dev=%p) (priv=%p)\n", __func__, dev, priv);
184 ret = mbox_get_by_index(dev, 0, &priv->mbox);
186 pr_err("mbox_get_by_index() failed: %d\n", ret);
190 tx_base = tegra186_bpmp_get_shmem(dev, 0);
191 if (IS_ERR_VALUE(tx_base)) {
192 pr_err("tegra186_bpmp_get_shmem failed for tx_base\n");
195 rx_base = tegra186_bpmp_get_shmem(dev, 1);
196 if (IS_ERR_VALUE(rx_base)) {
197 pr_err("tegra186_bpmp_get_shmem failed for rx_base\n");
200 debug("shmem: rx=%lx, tx=%lx\n", rx_base, tx_base);
202 ret = tegra_ivc_init(&priv->ivc, rx_base, tx_base, BPMP_IVC_FRAME_COUNT,
203 BPMP_IVC_FRAME_SIZE, tegra186_bpmp_ivc_notify);
205 pr_err("tegra_ivc_init() failed: %d\n", ret);
209 tegra_ivc_channel_reset(&priv->ivc);
210 start_time = timer_get_us();
212 ret = tegra_ivc_channel_notified(&priv->ivc);
217 if ((timer_get_us() - start_time) > 100 * 1000) {
218 pr_err("Initial IVC reset timed out (%d)\n", ret);
227 mbox_free(&priv->mbox);
232 static int tegra186_bpmp_remove(struct udevice *dev)
234 struct tegra186_bpmp *priv = dev_get_priv(dev);
236 debug("%s(dev=%p) (priv=%p)\n", __func__, dev, priv);
238 mbox_free(&priv->mbox);
243 static struct misc_ops tegra186_bpmp_ops = {
244 .call = tegra186_bpmp_call,
247 static const struct udevice_id tegra186_bpmp_ids[] = {
248 { .compatible = "nvidia,tegra186-bpmp" },
252 U_BOOT_DRIVER(tegra186_bpmp) = {
253 .name = "tegra186_bpmp",
255 .of_match = tegra186_bpmp_ids,
256 .bind = tegra186_bpmp_bind,
257 .probe = tegra186_bpmp_probe,
258 .remove = tegra186_bpmp_remove,
259 .ops = &tegra186_bpmp_ops,
260 .priv_auto = sizeof(struct tegra186_bpmp),