drivers/mailbox/mailbox-uclass.c

   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 };