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
 17static DEFINE_MUTEX(ep_map_mutex);
 18static const struct psil_ep_map *soc_ep_map;
 19
 20static 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
 34struct 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}
 72EXPORT_SYMBOL_GPL(psil_get_ep_config);
 73
 74int 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}
108EXPORT_SYMBOL_GPL(psil_set_new_ep_config);
109MODULE_DESCRIPTION("K3 PSI-L endpoint configuration");
110MODULE_LICENSE("GPL v2");