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/module.h>
   9 #include <linux/device.h>
  10 #include <linux/init.h>
  11 #include <linux/mutex.h>
  12 #include <linux/of.h>
  13 #include <linux/sys_soc.h>
  14
  15 #include "k3-psil-priv.h"
  16
  17 static DEFINE_MUTEX(ep_map_mutex);
  18 static const struct psil_ep_map *soc_ep_map;
  19
  20 static const struct soc_device_attribute k3_soc_devices[] = {
  21         { .family = "AM65X", .data = &am654_ep_map },
  22         { .family = "J721E", .data = &j721e_ep_map },
  23         { .family = "J7200", .data = &j7200_ep_map },
  24         { .family = "AM64X", .data = &am64_ep_map },
  25         { .family = "J721S2", .data = &j721s2_ep_map },
  26         { .family = "AM62X", .data = &am62_ep_map },
  27         { .family = "AM62AX", .data = &am62a_ep_map },
  28         { .family = "J784S4", .data = &j784s4_ep_map },
  29         { .family = "AM62PX", .data = &am62p_ep_map },
  30         { .family = "J722S", .data = &am62p_ep_map },
  31         { /* sentinel */ }
  32 };
  33
  34 struct psil_endpoint_config *psil_get_ep_config(u32 thread_id)
  35 {
  36         int i;
  37
  38         mutex_lock(&ep_map_mutex);
  39         if (!soc_ep_map) {
  40                 const struct soc_device_attribute *soc;
  41
  42                 soc = soc_device_match(k3_soc_devices);
  43                 if (soc) {
  44                         soc_ep_map = soc->data;
  45                 } else {
  46                         pr_err("PSIL: No compatible machine found for map\n");
  47                         mutex_unlock(&ep_map_mutex);
  48                         return ERR_PTR(-ENOTSUPP);
  49                 }
  50                 pr_debug("%s: Using map for %s\n", __func__, soc_ep_map->name);
  51         }
  52         mutex_unlock(&ep_map_mutex);
  53
  54         if (thread_id & K3_PSIL_DST_THREAD_ID_OFFSET && soc_ep_map->dst) {
  55                 /* check in destination thread map */
  56                 for (i = 0; i < soc_ep_map->dst_count; i++) {
  57                         if (soc_ep_map->dst[i].thread_id == thread_id)
  58                                 return &soc_ep_map->dst[i].ep_config;
  59                 }
  60         }
  61
  62         thread_id &= ~K3_PSIL_DST_THREAD_ID_OFFSET;
  63         if (soc_ep_map->src) {
  64                 for (i = 0; i < soc_ep_map->src_count; i++) {
  65                         if (soc_ep_map->src[i].thread_id == thread_id)
  66                                 return &soc_ep_map->src[i].ep_config;
  67                 }
  68         }
  69
  70         return ERR_PTR(-ENOENT);
  71 }
  72 EXPORT_SYMBOL_GPL(psil_get_ep_config);
  73
  74 int psil_set_new_ep_config(struct device *dev, const char *name,
  75                            struct psil_endpoint_config *ep_config)
  76 {
  77         struct psil_endpoint_config *dst_ep_config;
  78         struct of_phandle_args dma_spec;
  79         u32 thread_id;
  80         int index;
  81
  82         if (!dev || !dev->of_node)
  83                 return -EINVAL;
  84
  85         index = of_property_match_string(dev->of_node, "dma-names", name);
  86         if (index < 0)
  87                 return index;
  88
  89         if (of_parse_phandle_with_args(dev->of_node, "dmas", "#dma-cells",
  90                                        index, &dma_spec))
  91                 return -ENOENT;
  92
  93         thread_id = dma_spec.args[0];
  94
  95         dst_ep_config = psil_get_ep_config(thread_id);
  96         if (IS_ERR(dst_ep_config)) {
  97                 pr_err("PSIL: thread ID 0x%04x not defined in map\n",
  98                        thread_id);
  99                 of_node_put(dma_spec.np);
 100                 return PTR_ERR(dst_ep_config);
 101         }
 102
 103         memcpy(dst_ep_config, ep_config, sizeof(*dst_ep_config));
 104
 105         of_node_put(dma_spec.np);
 106         return 0;
 107 }
 108 EXPORT_SYMBOL_GPL(psil_set_new_ep_config);
 109 MODULE_DESCRIPTION("K3 PSI-L endpoint configuration");
 110 MODULE_LICENSE("GPL v2");