drivers/dma/ti/k3-psil.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  *  Copyright (C) 2019 Texas Instruments Incorporated - http://www.ti.com
   4  *  Author: Peter Ujfalusi <peter.ujfalusi@ti.com>
   5  */
   6
   7 #include <linux/kernel.h>
   8 #include <linux/device.h>
   9 #include <linux/init.h>
  10 #include <linux/mutex.h>
  11 #include <linux/of.h>
  12 #include <linux/sys_soc.h>
  13
  14 #include "k3-psil-priv.h"
  15
  16 static DEFINE_MUTEX(ep_map_mutex);
  17 static const struct psil_ep_map *soc_ep_map;
  18
  19 static const struct soc_device_attribute k3_soc_devices[] = {
  20         { .family = "AM65X", .data = &am654_ep_map },
  21         { .family = "J721E", .data = &j721e_ep_map },
  22         { .family = "J7200", .data = &j7200_ep_map },
  23         { .family = "AM64X", .data = &am64_ep_map },
  24         { /* sentinel */ }
  25 };
  26
  27 struct psil_endpoint_config *psil_get_ep_config(u32 thread_id)
  28 {
  29         int i;
  30
  31         mutex_lock(&ep_map_mutex);
  32         if (!soc_ep_map) {
  33                 const struct soc_device_attribute *soc;
  34
  35                 soc = soc_device_match(k3_soc_devices);
  36                 if (soc) {
  37                         soc_ep_map = soc->data;
  38                 } else {
  39                         pr_err("PSIL: No compatible machine found for map\n");
  40                         mutex_unlock(&ep_map_mutex);
  41                         return ERR_PTR(-ENOTSUPP);
  42                 }
  43                 pr_debug("%s: Using map for %s\n", __func__, soc_ep_map->name);
  44         }
  45         mutex_unlock(&ep_map_mutex);
  46
  47         if (thread_id & K3_PSIL_DST_THREAD_ID_OFFSET && soc_ep_map->dst) {
  48                 /* check in destination thread map */
  49                 for (i = 0; i < soc_ep_map->dst_count; i++) {
  50                         if (soc_ep_map->dst[i].thread_id == thread_id)
  51                                 return &soc_ep_map->dst[i].ep_config;
  52                 }
  53         }
  54
  55         thread_id &= ~K3_PSIL_DST_THREAD_ID_OFFSET;
  56         if (soc_ep_map->src) {
  57                 for (i = 0; i < soc_ep_map->src_count; i++) {
  58                         if (soc_ep_map->src[i].thread_id == thread_id)
  59                                 return &soc_ep_map->src[i].ep_config;
  60                 }
  61         }
  62
  63         return ERR_PTR(-ENOENT);
  64 }
  65 EXPORT_SYMBOL_GPL(psil_get_ep_config);
  66
  67 int psil_set_new_ep_config(struct device *dev, const char *name,
  68                            struct psil_endpoint_config *ep_config)
  69 {
  70         struct psil_endpoint_config *dst_ep_config;
  71         struct of_phandle_args dma_spec;
  72         u32 thread_id;
  73         int index;
  74
  75         if (!dev || !dev->of_node)
  76                 return -EINVAL;
  77
  78         index = of_property_match_string(dev->of_node, "dma-names", name);
  79         if (index < 0)
  80                 return index;
  81
  82         if (of_parse_phandle_with_args(dev->of_node, "dmas", "#dma-cells",
  83                                        index, &dma_spec))
  84                 return -ENOENT;
  85
  86         thread_id = dma_spec.args[0];
  87
  88         dst_ep_config = psil_get_ep_config(thread_id);
  89         if (IS_ERR(dst_ep_config)) {
  90                 pr_err("PSIL: thread ID 0x%04x not defined in map\n",
  91                        thread_id);
  92                 of_node_put(dma_spec.np);
  93                 return PTR_ERR(dst_ep_config);
  94         }
  95
  96         memcpy(dst_ep_config, ep_config, sizeof(*dst_ep_config));
  97
  98         of_node_put(dma_spec.np);
  99         return 0;
 100 }
 101 EXPORT_SYMBOL_GPL(psil_set_new_ep_config);