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 { /* sentinel */ } 24 }; 25 26 struct psil_endpoint_config *psil_get_ep_config(u32 thread_id) 27 { 28 int i; 29 30 mutex_lock(&ep_map_mutex); 31 if (!soc_ep_map) { 32 const struct soc_device_attribute *soc; 33 34 soc = soc_device_match(k3_soc_devices); 35 if (soc) { 36 soc_ep_map = soc->data; 37 } else { 38 pr_err("PSIL: No compatible machine found for map\n"); 39 mutex_unlock(&ep_map_mutex); 40 return ERR_PTR(-ENOTSUPP); 41 } 42 pr_debug("%s: Using map for %s\n", __func__, soc_ep_map->name); 43 } 44 mutex_unlock(&ep_map_mutex); 45 46 if (thread_id & K3_PSIL_DST_THREAD_ID_OFFSET && soc_ep_map->dst) { 47 /* check in destination thread map */ 48 for (i = 0; i < soc_ep_map->dst_count; i++) { 49 if (soc_ep_map->dst[i].thread_id == thread_id) 50 return &soc_ep_map->dst[i].ep_config; 51 } 52 } 53 54 thread_id &= ~K3_PSIL_DST_THREAD_ID_OFFSET; 55 if (soc_ep_map->src) { 56 for (i = 0; i < soc_ep_map->src_count; i++) { 57 if (soc_ep_map->src[i].thread_id == thread_id) 58 return &soc_ep_map->src[i].ep_config; 59 } 60 } 61 62 return ERR_PTR(-ENOENT); 63 } 64 EXPORT_SYMBOL_GPL(psil_get_ep_config); 65 66 int psil_set_new_ep_config(struct device *dev, const char *name, 67 struct psil_endpoint_config *ep_config) 68 { 69 struct psil_endpoint_config *dst_ep_config; 70 struct of_phandle_args dma_spec; 71 u32 thread_id; 72 int index; 73 74 if (!dev || !dev->of_node) 75 return -EINVAL; 76 77 index = of_property_match_string(dev->of_node, "dma-names", name); 78 if (index < 0) 79 return index; 80 81 if (of_parse_phandle_with_args(dev->of_node, "dmas", "#dma-cells", 82 index, &dma_spec)) 83 return -ENOENT; 84 85 thread_id = dma_spec.args[0]; 86 87 dst_ep_config = psil_get_ep_config(thread_id); 88 if (IS_ERR(dst_ep_config)) { 89 pr_err("PSIL: thread ID 0x%04x not defined in map\n", 90 thread_id); 91 of_node_put(dma_spec.np); 92 return PTR_ERR(dst_ep_config); 93 } 94 95 memcpy(dst_ep_config, ep_config, sizeof(*dst_ep_config)); 96 97 of_node_put(dma_spec.np); 98 return 0; 99 } 100 EXPORT_SYMBOL_GPL(psil_set_new_ep_config); 101