1 /* 2 * Copyright (c) 2016, NVIDIA CORPORATION. 3 * 4 * SPDX-License-Identifier: GPL-2.0 5 */ 6 7 #include <common.h> 8 #include <dm.h> 9 #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 22 DECLARE_GLOBAL_DATA_PTR; 23 24 struct tegra186_bpmp { 25 struct mbox_chan mbox; 26 struct tegra_ivc ivc; 27 }; 28 29 static 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) { 47 error("tegra_ivc_write_get_next_frame() failed: %d\n", ret); 48 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) { 58 error("tegra_ivc_write_advance() failed: %d\n", ret); 59 return ret; 60 } 61 62 start_time = timer_get_us(); 63 for (;;) { 64 ret = tegra_ivc_channel_notified(&priv->ivc); 65 if (ret) { 66 error("tegra_ivc_channel_notified() failed: %d\n", ret); 67 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) { 76 error("tegra_ivc_read_get_next_frame() timed out (%d)\n", 77 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) { 89 error("tegra_ivc_write_advance() failed: %d\n", ret); 90 return ret; 91 } 92 93 if (err) { 94 error("BPMP responded with error %d\n", err); 95 /* 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 */ 107 static 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", 115 dev->of_offset, &child); 116 if (ret) 117 return ret; 118 119 ret = device_bind_driver_to_node(dev, "tegra186_reset", 120 "tegra186_reset", dev->of_offset, 121 &child); 122 if (ret) 123 return ret; 124 125 ret = device_bind_driver_to_node(dev, "tegra186_power_domain", 126 "tegra186_power_domain", 127 dev->of_offset, &child); 128 if (ret) 129 return ret; 130 131 ret = dm_scan_fdt_dev(dev); 132 if (ret) 133 return ret; 134 135 return 0; 136 } 137 138 static 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; 143 144 ret = fdtdec_parse_phandle_with_args(gd->fdt_blob, dev->of_offset, 145 "shmem", NULL, 0, index, &args); 146 if (ret < 0) { 147 error("fdtdec_parse_phandle_with_args() failed: %d\n", ret); 148 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) { 154 error("fdtdec_get_addr_size_auto_noparent() failed\n"); 155 return -ENODEV; 156 } 157 158 return reg; 159 } 160 161 static 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) 169 error("mbox_send() failed: %d\n", ret); 170 } 171 172 static 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) { 182 error("mbox_get_by_index() failed: %d\n", ret); 183 return ret; 184 } 185 186 tx_base = tegra186_bpmp_get_shmem(dev, 0); 187 if (IS_ERR_VALUE(tx_base)) { 188 error("tegra186_bpmp_get_shmem failed for tx_base\n"); 189 return tx_base; 190 } 191 rx_base = tegra186_bpmp_get_shmem(dev, 1); 192 if (IS_ERR_VALUE(rx_base)) { 193 error("tegra186_bpmp_get_shmem failed for rx_base\n"); 194 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) { 201 error("tegra_ivc_init() failed: %d\n", ret); 202 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) { 214 error("Initial IVC reset timed out (%d)\n", ret); 215 ret = -ETIMEDOUT; 216 goto err_free_mbox; 217 } 218 } 219 220 return 0; 221 222 err_free_mbox: 223 mbox_free(&priv->mbox); 224 225 return ret; 226 } 227 228 static 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 } 238 239 static struct misc_ops tegra186_bpmp_ops = { 240 .call = tegra186_bpmp_call, 241 }; 242 243 static const struct udevice_id tegra186_bpmp_ids[] = { 244 { .compatible = "nvidia,tegra186-bpmp" }, 245 { } 246 }; 247 248 U_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 }; 258