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Tom Rini83d290c2018-05-06 17:58:06 -04001// SPDX-License-Identifier: GPL-2.0
Stephen Warren73dd5c42016-08-08 09:41:34 -06002/*
3 * Copyright (c) 2016, NVIDIA CORPORATION.
Stephen Warren73dd5c42016-08-08 09:41:34 -06004 */
5
6#include <common.h>
7#include <dm.h>
Simon Glass10453152019-11-14 12:57:30 -07008#include <time.h>
Stephen Warren73dd5c42016-08-08 09:41:34 -06009#include <dm/lists.h>
10#include <dm/root.h>
11#include <mailbox.h>
12#include <misc.h>
13#include <asm/arch-tegra/bpmp_abi.h>
14#include <asm/arch-tegra/ivc.h>
15
16#define BPMP_IVC_FRAME_COUNT 1
17#define BPMP_IVC_FRAME_SIZE 128
18
19#define BPMP_FLAG_DO_ACK BIT(0)
20#define BPMP_FLAG_RING_DOORBELL BIT(1)
21
22DECLARE_GLOBAL_DATA_PTR;
23
24struct tegra186_bpmp {
25 struct mbox_chan mbox;
26 struct tegra_ivc ivc;
27};
28
29static int tegra186_bpmp_call(struct udevice *dev, int mrq, void *tx_msg,
30 int tx_size, void *rx_msg, int rx_size)
31{
32 struct tegra186_bpmp *priv = dev_get_priv(dev);
33 int ret, err;
34 void *ivc_frame;
35 struct mrq_request *req;
36 struct mrq_response *resp;
37 ulong start_time;
38
39 debug("%s(dev=%p, mrq=%u, tx_msg=%p, tx_size=%d, rx_msg=%p, rx_size=%d) (priv=%p)\n",
40 __func__, dev, mrq, tx_msg, tx_size, rx_msg, rx_size, priv);
41
42 if ((tx_size > BPMP_IVC_FRAME_SIZE) || (rx_size > BPMP_IVC_FRAME_SIZE))
43 return -EINVAL;
44
45 ret = tegra_ivc_write_get_next_frame(&priv->ivc, &ivc_frame);
46 if (ret) {
Masahiro Yamada9b643e32017-09-16 14:10:41 +090047 pr_err("tegra_ivc_write_get_next_frame() failed: %d\n", ret);
Stephen Warren73dd5c42016-08-08 09:41:34 -060048 return ret;
49 }
50
51 req = ivc_frame;
52 req->mrq = mrq;
53 req->flags = BPMP_FLAG_DO_ACK | BPMP_FLAG_RING_DOORBELL;
54 memcpy(req + 1, tx_msg, tx_size);
55
56 ret = tegra_ivc_write_advance(&priv->ivc);
57 if (ret) {
Masahiro Yamada9b643e32017-09-16 14:10:41 +090058 pr_err("tegra_ivc_write_advance() failed: %d\n", ret);
Stephen Warren73dd5c42016-08-08 09:41:34 -060059 return ret;
60 }
61
62 start_time = timer_get_us();
63 for (;;) {
64 ret = tegra_ivc_channel_notified(&priv->ivc);
65 if (ret) {
Masahiro Yamada9b643e32017-09-16 14:10:41 +090066 pr_err("tegra_ivc_channel_notified() failed: %d\n", ret);
Stephen Warren73dd5c42016-08-08 09:41:34 -060067 return ret;
68 }
69
70 ret = tegra_ivc_read_get_next_frame(&priv->ivc, &ivc_frame);
71 if (!ret)
72 break;
73
74 /* Timeout 20ms; roughly 10x current max observed duration */
75 if ((timer_get_us() - start_time) > 20 * 1000) {
Masahiro Yamada9b643e32017-09-16 14:10:41 +090076 pr_err("tegra_ivc_read_get_next_frame() timed out (%d)\n",
Stephen Warren73dd5c42016-08-08 09:41:34 -060077 ret);
78 return -ETIMEDOUT;
79 }
80 }
81
82 resp = ivc_frame;
83 err = resp->err;
84 if (!err && rx_msg && rx_size)
85 memcpy(rx_msg, resp + 1, rx_size);
86
87 ret = tegra_ivc_read_advance(&priv->ivc);
88 if (ret) {
Masahiro Yamada9b643e32017-09-16 14:10:41 +090089 pr_err("tegra_ivc_write_advance() failed: %d\n", ret);
Stephen Warren73dd5c42016-08-08 09:41:34 -060090 return ret;
91 }
92
93 if (err) {
Masahiro Yamada9b643e32017-09-16 14:10:41 +090094 pr_err("BPMP responded with error %d\n", err);
Stephen Warren73dd5c42016-08-08 09:41:34 -060095 /* err isn't a U-Boot error code, so don't that */
96 return -EIO;
97 }
98
99 return rx_size;
100}
101
102/**
103 * The BPMP exposes multiple different services. We create a sub-device for
104 * each separate type of service, since each device must be of the appropriate
105 * UCLASS.
106 */
107static int tegra186_bpmp_bind(struct udevice *dev)
108{
109 int ret;
110 struct udevice *child;
111
112 debug("%s(dev=%p)\n", __func__, dev);
113
114 ret = device_bind_driver_to_node(dev, "tegra186_clk", "tegra186_clk",
Simon Glass45a26862017-05-18 20:09:07 -0600115 dev_ofnode(dev), &child);
Stephen Warren73dd5c42016-08-08 09:41:34 -0600116 if (ret)
117 return ret;
118
119 ret = device_bind_driver_to_node(dev, "tegra186_reset",
Simon Glass45a26862017-05-18 20:09:07 -0600120 "tegra186_reset", dev_ofnode(dev),
Stephen Warren73dd5c42016-08-08 09:41:34 -0600121 &child);
122 if (ret)
123 return ret;
124
125 ret = device_bind_driver_to_node(dev, "tegra186_power_domain",
126 "tegra186_power_domain",
Simon Glass45a26862017-05-18 20:09:07 -0600127 dev_ofnode(dev), &child);
Stephen Warren73dd5c42016-08-08 09:41:34 -0600128 if (ret)
129 return ret;
130
131 ret = dm_scan_fdt_dev(dev);
132 if (ret)
133 return ret;
134
135 return 0;
136}
137
138static ulong tegra186_bpmp_get_shmem(struct udevice *dev, int index)
139{
140 int ret;
141 struct fdtdec_phandle_args args;
142 fdt_addr_t reg;
143
Simon Glasse160f7d2017-01-17 16:52:55 -0700144 ret = fdtdec_parse_phandle_with_args(gd->fdt_blob, dev_of_offset(dev),
Stephen Warren73dd5c42016-08-08 09:41:34 -0600145 "shmem", NULL, 0, index, &args);
146 if (ret < 0) {
Masahiro Yamada9b643e32017-09-16 14:10:41 +0900147 pr_err("fdtdec_parse_phandle_with_args() failed: %d\n", ret);
Stephen Warren73dd5c42016-08-08 09:41:34 -0600148 return ret;
149 }
150
151 reg = fdtdec_get_addr_size_auto_noparent(gd->fdt_blob, args.node,
152 "reg", 0, NULL, true);
153 if (reg == FDT_ADDR_T_NONE) {
Masahiro Yamada9b643e32017-09-16 14:10:41 +0900154 pr_err("fdtdec_get_addr_size_auto_noparent() failed\n");
Stephen Warren73dd5c42016-08-08 09:41:34 -0600155 return -ENODEV;
156 }
157
158 return reg;
159}
160
161static void tegra186_bpmp_ivc_notify(struct tegra_ivc *ivc)
162{
163 struct tegra186_bpmp *priv =
164 container_of(ivc, struct tegra186_bpmp, ivc);
165 int ret;
166
167 ret = mbox_send(&priv->mbox, NULL);
168 if (ret)
Masahiro Yamada9b643e32017-09-16 14:10:41 +0900169 pr_err("mbox_send() failed: %d\n", ret);
Stephen Warren73dd5c42016-08-08 09:41:34 -0600170}
171
172static int tegra186_bpmp_probe(struct udevice *dev)
173{
174 struct tegra186_bpmp *priv = dev_get_priv(dev);
175 int ret;
176 ulong tx_base, rx_base, start_time;
177
178 debug("%s(dev=%p) (priv=%p)\n", __func__, dev, priv);
179
180 ret = mbox_get_by_index(dev, 0, &priv->mbox);
181 if (ret) {
Masahiro Yamada9b643e32017-09-16 14:10:41 +0900182 pr_err("mbox_get_by_index() failed: %d\n", ret);
Stephen Warren73dd5c42016-08-08 09:41:34 -0600183 return ret;
184 }
185
186 tx_base = tegra186_bpmp_get_shmem(dev, 0);
187 if (IS_ERR_VALUE(tx_base)) {
Masahiro Yamada9b643e32017-09-16 14:10:41 +0900188 pr_err("tegra186_bpmp_get_shmem failed for tx_base\n");
Stephen Warren73dd5c42016-08-08 09:41:34 -0600189 return tx_base;
190 }
191 rx_base = tegra186_bpmp_get_shmem(dev, 1);
192 if (IS_ERR_VALUE(rx_base)) {
Masahiro Yamada9b643e32017-09-16 14:10:41 +0900193 pr_err("tegra186_bpmp_get_shmem failed for rx_base\n");
Stephen Warren73dd5c42016-08-08 09:41:34 -0600194 return rx_base;
195 }
196 debug("shmem: rx=%lx, tx=%lx\n", rx_base, tx_base);
197
198 ret = tegra_ivc_init(&priv->ivc, rx_base, tx_base, BPMP_IVC_FRAME_COUNT,
199 BPMP_IVC_FRAME_SIZE, tegra186_bpmp_ivc_notify);
200 if (ret) {
Masahiro Yamada9b643e32017-09-16 14:10:41 +0900201 pr_err("tegra_ivc_init() failed: %d\n", ret);
Stephen Warren73dd5c42016-08-08 09:41:34 -0600202 return ret;
203 }
204
205 tegra_ivc_channel_reset(&priv->ivc);
206 start_time = timer_get_us();
207 for (;;) {
208 ret = tegra_ivc_channel_notified(&priv->ivc);
209 if (!ret)
210 break;
211
212 /* Timeout 100ms */
213 if ((timer_get_us() - start_time) > 100 * 1000) {
Masahiro Yamada9b643e32017-09-16 14:10:41 +0900214 pr_err("Initial IVC reset timed out (%d)\n", ret);
Stephen Warren73dd5c42016-08-08 09:41:34 -0600215 ret = -ETIMEDOUT;
216 goto err_free_mbox;
217 }
218 }
219
220 return 0;
221
222err_free_mbox:
223 mbox_free(&priv->mbox);
224
225 return ret;
226}
227
228static int tegra186_bpmp_remove(struct udevice *dev)
229{
230 struct tegra186_bpmp *priv = dev_get_priv(dev);
231
232 debug("%s(dev=%p) (priv=%p)\n", __func__, dev, priv);
233
234 mbox_free(&priv->mbox);
235
236 return 0;
237}
238
239static struct misc_ops tegra186_bpmp_ops = {
240 .call = tegra186_bpmp_call,
241};
242
243static const struct udevice_id tegra186_bpmp_ids[] = {
244 { .compatible = "nvidia,tegra186-bpmp" },
245 { }
246};
247
248U_BOOT_DRIVER(tegra186_bpmp) = {
249 .name = "tegra186_bpmp",
250 .id = UCLASS_MISC,
251 .of_match = tegra186_bpmp_ids,
252 .bind = tegra186_bpmp_bind,
253 .probe = tegra186_bpmp_probe,
254 .remove = tegra186_bpmp_remove,
255 .ops = &tegra186_bpmp_ops,
256 .priv_auto_alloc_size = sizeof(struct tegra186_bpmp),
257};