diff options
Diffstat (limited to '')
-rw-r--r-- | drivers/dma/ti/k3-psil.c | 100 |
1 files changed, 100 insertions, 0 deletions
diff --git a/drivers/dma/ti/k3-psil.c b/drivers/dma/ti/k3-psil.c new file mode 100644 index 000000000..837853aab --- /dev/null +++ b/drivers/dma/ti/k3-psil.c @@ -0,0 +1,100 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright (C) 2019 Texas Instruments Incorporated - http://www.ti.com + * Author: Peter Ujfalusi <peter.ujfalusi@ti.com> + */ + +#include <linux/kernel.h> +#include <linux/device.h> +#include <linux/init.h> +#include <linux/mutex.h> +#include <linux/of.h> +#include <linux/sys_soc.h> + +#include "k3-psil-priv.h" + +static DEFINE_MUTEX(ep_map_mutex); +static const struct psil_ep_map *soc_ep_map; + +static const struct soc_device_attribute k3_soc_devices[] = { + { .family = "AM65X", .data = &am654_ep_map }, + { .family = "J721E", .data = &j721e_ep_map }, + { .family = "J7200", .data = &j7200_ep_map }, + { /* sentinel */ } +}; + +struct psil_endpoint_config *psil_get_ep_config(u32 thread_id) +{ + int i; + + mutex_lock(&ep_map_mutex); + if (!soc_ep_map) { + const struct soc_device_attribute *soc; + + soc = soc_device_match(k3_soc_devices); + if (soc) { + soc_ep_map = soc->data; + } else { + pr_err("PSIL: No compatible machine found for map\n"); + mutex_unlock(&ep_map_mutex); + return ERR_PTR(-ENOTSUPP); + } + pr_debug("%s: Using map for %s\n", __func__, soc_ep_map->name); + } + mutex_unlock(&ep_map_mutex); + + if (thread_id & K3_PSIL_DST_THREAD_ID_OFFSET && soc_ep_map->dst) { + /* check in destination thread map */ + for (i = 0; i < soc_ep_map->dst_count; i++) { + if (soc_ep_map->dst[i].thread_id == thread_id) + return &soc_ep_map->dst[i].ep_config; + } + } + + thread_id &= ~K3_PSIL_DST_THREAD_ID_OFFSET; + if (soc_ep_map->src) { + for (i = 0; i < soc_ep_map->src_count; i++) { + if (soc_ep_map->src[i].thread_id == thread_id) + return &soc_ep_map->src[i].ep_config; + } + } + + return ERR_PTR(-ENOENT); +} +EXPORT_SYMBOL_GPL(psil_get_ep_config); + +int psil_set_new_ep_config(struct device *dev, const char *name, + struct psil_endpoint_config *ep_config) +{ + struct psil_endpoint_config *dst_ep_config; + struct of_phandle_args dma_spec; + u32 thread_id; + int index; + + if (!dev || !dev->of_node) + return -EINVAL; + + index = of_property_match_string(dev->of_node, "dma-names", name); + if (index < 0) + return index; + + if (of_parse_phandle_with_args(dev->of_node, "dmas", "#dma-cells", + index, &dma_spec)) + return -ENOENT; + + thread_id = dma_spec.args[0]; + + dst_ep_config = psil_get_ep_config(thread_id); + if (IS_ERR(dst_ep_config)) { + pr_err("PSIL: thread ID 0x%04x not defined in map\n", + thread_id); + of_node_put(dma_spec.np); + return PTR_ERR(dst_ep_config); + } + + memcpy(dst_ep_config, ep_config, sizeof(*dst_ep_config)); + + of_node_put(dma_spec.np); + return 0; +} +EXPORT_SYMBOL_GPL(psil_set_new_ep_config); |