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 <fdtdec.h> 10 #include <mailbox.h> 11 #include <mailbox-uclass.h> 12 13 DECLARE_GLOBAL_DATA_PTR; 14 15 static inline struct mbox_ops *mbox_dev_ops(struct udevice *dev) 16 { 17 return (struct mbox_ops *)dev->driver->ops; 18 } 19 20 static int mbox_of_xlate_default(struct mbox_chan *chan, 21 struct fdtdec_phandle_args *args) 22 { 23 debug("%s(chan=%p)\n", __func__, chan); 24 25 if (args->args_count != 1) { 26 debug("Invaild args_count: %d\n", args->args_count); 27 return -EINVAL; 28 } 29 30 chan->id = args->args[0]; 31 32 return 0; 33 } 34 35 int mbox_get_by_index(struct udevice *dev, int index, struct mbox_chan *chan) 36 { 37 struct fdtdec_phandle_args args; 38 int ret; 39 struct udevice *dev_mbox; 40 struct mbox_ops *ops; 41 42 debug("%s(dev=%p, index=%d, chan=%p)\n", __func__, dev, index, chan); 43 44 ret = fdtdec_parse_phandle_with_args(gd->fdt_blob, dev->of_offset, 45 "mboxes", "#mbox-cells", 0, 46 index, &args); 47 if (ret) { 48 debug("%s: fdtdec_parse_phandle_with_args failed: %d\n", 49 __func__, ret); 50 return ret; 51 } 52 53 ret = uclass_get_device_by_of_offset(UCLASS_MAILBOX, args.node, 54 &dev_mbox); 55 if (ret) { 56 debug("%s: uclass_get_device_by_of_offset failed: %d\n", 57 __func__, ret); 58 return ret; 59 } 60 ops = mbox_dev_ops(dev_mbox); 61 62 chan->dev = dev_mbox; 63 if (ops->of_xlate) 64 ret = ops->of_xlate(chan, &args); 65 else 66 ret = mbox_of_xlate_default(chan, &args); 67 if (ret) { 68 debug("of_xlate() failed: %d\n", ret); 69 return ret; 70 } 71 72 ret = ops->request(chan); 73 if (ret) { 74 debug("ops->request() failed: %d\n", ret); 75 return ret; 76 } 77 78 return 0; 79 } 80 81 int mbox_get_by_name(struct udevice *dev, const char *name, 82 struct mbox_chan *chan) 83 { 84 int index; 85 86 debug("%s(dev=%p, name=%s, chan=%p)\n", __func__, dev, name, chan); 87 88 index = fdt_find_string(gd->fdt_blob, dev->of_offset, "mbox-names", 89 name); 90 if (index < 0) { 91 debug("fdt_find_string() failed: %d\n", index); 92 return index; 93 } 94 95 return mbox_get_by_index(dev, index, chan); 96 } 97 98 int mbox_free(struct mbox_chan *chan) 99 { 100 struct mbox_ops *ops = mbox_dev_ops(chan->dev); 101 102 debug("%s(chan=%p)\n", __func__, chan); 103 104 return ops->free(chan); 105 } 106 107 int mbox_send(struct mbox_chan *chan, const void *data) 108 { 109 struct mbox_ops *ops = mbox_dev_ops(chan->dev); 110 111 debug("%s(chan=%p, data=%p)\n", __func__, chan, data); 112 113 return ops->send(chan, data); 114 } 115 116 int mbox_recv(struct mbox_chan *chan, void *data, ulong timeout_us) 117 { 118 struct mbox_ops *ops = mbox_dev_ops(chan->dev); 119 ulong start_time; 120 int ret; 121 122 debug("%s(chan=%p, data=%p, timeout_us=%ld)\n", __func__, chan, data, 123 timeout_us); 124 125 start_time = timer_get_us(); 126 /* 127 * Account for partial us ticks, but if timeout_us is 0, ensure we 128 * still don't wait at all. 129 */ 130 if (timeout_us) 131 timeout_us++; 132 133 for (;;) { 134 ret = ops->recv(chan, data); 135 if (ret != -ENODATA) 136 return ret; 137 if ((timer_get_us() - start_time) >= timeout_us) 138 return -ETIMEDOUT; 139 } 140 } 141 142 UCLASS_DRIVER(mailbox) = { 143 .id = UCLASS_MAILBOX, 144 .name = "mailbox", 145 }; 146