1 // SPDX-License-Identifier: GPL-2.0
3 * Copyright (c) 2016, NVIDIA CORPORATION.
13 #include <asm/arch-tegra/bpmp_abi.h>
14 #include <asm/arch-tegra/ivc.h>
15 #include <linux/err.h>
17 #define BPMP_IVC_FRAME_COUNT 1
18 #define BPMP_IVC_FRAME_SIZE 128
20 #define BPMP_FLAG_DO_ACK BIT(0)
21 #define BPMP_FLAG_RING_DOORBELL BIT(1)
23 DECLARE_GLOBAL_DATA_PTR;
25 struct tegra186_bpmp {
26 struct mbox_chan mbox;
30 static int tegra186_bpmp_call(struct udevice *dev, int mrq, void *tx_msg,
31 int tx_size, void *rx_msg, int rx_size)
33 struct tegra186_bpmp *priv = dev_get_priv(dev);
36 struct mrq_request *req;
37 struct mrq_response *resp;
40 debug("%s(dev=%p, mrq=%u, tx_msg=%p, tx_size=%d, rx_msg=%p, rx_size=%d) (priv=%p)\n",
41 __func__, dev, mrq, tx_msg, tx_size, rx_msg, rx_size, priv);
43 if ((tx_size > BPMP_IVC_FRAME_SIZE) || (rx_size > BPMP_IVC_FRAME_SIZE))
46 ret = tegra_ivc_write_get_next_frame(&priv->ivc, &ivc_frame);
48 pr_err("tegra_ivc_write_get_next_frame() failed: %d\n", ret);
54 req->flags = BPMP_FLAG_DO_ACK | BPMP_FLAG_RING_DOORBELL;
55 memcpy(req + 1, tx_msg, tx_size);
57 ret = tegra_ivc_write_advance(&priv->ivc);
59 pr_err("tegra_ivc_write_advance() failed: %d\n", ret);
63 start_time = timer_get_us();
65 ret = tegra_ivc_channel_notified(&priv->ivc);
67 pr_err("tegra_ivc_channel_notified() failed: %d\n", ret);
71 ret = tegra_ivc_read_get_next_frame(&priv->ivc, &ivc_frame);
75 /* Timeout 20ms; roughly 10x current max observed duration */
76 if ((timer_get_us() - start_time) > 20 * 1000) {
77 pr_err("tegra_ivc_read_get_next_frame() timed out (%d)\n",
85 if (!err && rx_msg && rx_size)
86 memcpy(rx_msg, resp + 1, rx_size);
88 ret = tegra_ivc_read_advance(&priv->ivc);
90 pr_err("tegra_ivc_write_advance() failed: %d\n", ret);
95 pr_err("BPMP responded with error %d\n", err);
96 /* err isn't a U-Boot error code, so don't that */
104 * The BPMP exposes multiple different services. We create a sub-device for
105 * each separate type of service, since each device must be of the appropriate
108 static int tegra186_bpmp_bind(struct udevice *dev)
111 struct udevice *child;
113 debug("%s(dev=%p)\n", __func__, dev);
115 ret = device_bind_driver_to_node(dev, "tegra186_clk", "tegra186_clk",
116 dev_ofnode(dev), &child);
120 ret = device_bind_driver_to_node(dev, "tegra186_reset",
121 "tegra186_reset", dev_ofnode(dev),
126 ret = device_bind_driver_to_node(dev, "tegra186_power_domain",
127 "tegra186_power_domain",
128 dev_ofnode(dev), &child);
132 ret = dm_scan_fdt_dev(dev);
139 static ulong tegra186_bpmp_get_shmem(struct udevice *dev, int index)
142 struct fdtdec_phandle_args args;
145 ret = fdtdec_parse_phandle_with_args(gd->fdt_blob, dev_of_offset(dev),
146 "shmem", NULL, 0, index, &args);
148 pr_err("fdtdec_parse_phandle_with_args() failed: %d\n", ret);
152 reg = fdtdec_get_addr_size_auto_noparent(gd->fdt_blob, args.node,
153 "reg", 0, NULL, true);
154 if (reg == FDT_ADDR_T_NONE) {
155 pr_err("fdtdec_get_addr_size_auto_noparent() failed\n");
162 static void tegra186_bpmp_ivc_notify(struct tegra_ivc *ivc)
164 struct tegra186_bpmp *priv =
165 container_of(ivc, struct tegra186_bpmp, ivc);
168 ret = mbox_send(&priv->mbox, NULL);
170 pr_err("mbox_send() failed: %d\n", ret);
173 static int tegra186_bpmp_probe(struct udevice *dev)
175 struct tegra186_bpmp *priv = dev_get_priv(dev);
177 ulong tx_base, rx_base, start_time;
179 debug("%s(dev=%p) (priv=%p)\n", __func__, dev, priv);
181 ret = mbox_get_by_index(dev, 0, &priv->mbox);
183 pr_err("mbox_get_by_index() failed: %d\n", ret);
187 tx_base = tegra186_bpmp_get_shmem(dev, 0);
188 if (IS_ERR_VALUE(tx_base)) {
189 pr_err("tegra186_bpmp_get_shmem failed for tx_base\n");
192 rx_base = tegra186_bpmp_get_shmem(dev, 1);
193 if (IS_ERR_VALUE(rx_base)) {
194 pr_err("tegra186_bpmp_get_shmem failed for rx_base\n");
197 debug("shmem: rx=%lx, tx=%lx\n", rx_base, tx_base);
199 ret = tegra_ivc_init(&priv->ivc, rx_base, tx_base, BPMP_IVC_FRAME_COUNT,
200 BPMP_IVC_FRAME_SIZE, tegra186_bpmp_ivc_notify);
202 pr_err("tegra_ivc_init() failed: %d\n", ret);
206 tegra_ivc_channel_reset(&priv->ivc);
207 start_time = timer_get_us();
209 ret = tegra_ivc_channel_notified(&priv->ivc);
214 if ((timer_get_us() - start_time) > 100 * 1000) {
215 pr_err("Initial IVC reset timed out (%d)\n", ret);
224 mbox_free(&priv->mbox);
229 static int tegra186_bpmp_remove(struct udevice *dev)
231 struct tegra186_bpmp *priv = dev_get_priv(dev);
233 debug("%s(dev=%p) (priv=%p)\n", __func__, dev, priv);
235 mbox_free(&priv->mbox);
240 static struct misc_ops tegra186_bpmp_ops = {
241 .call = tegra186_bpmp_call,
244 static const struct udevice_id tegra186_bpmp_ids[] = {
245 { .compatible = "nvidia,tegra186-bpmp" },
249 U_BOOT_DRIVER(tegra186_bpmp) = {
250 .name = "tegra186_bpmp",
252 .of_match = tegra186_bpmp_ids,
253 .bind = tegra186_bpmp_bind,
254 .probe = tegra186_bpmp_probe,
255 .remove = tegra186_bpmp_remove,
256 .ops = &tegra186_bpmp_ops,
257 .priv_auto_alloc_size = sizeof(struct tegra186_bpmp),