+++ /dev/null
-/*
- * Copyright (c) 2014 Qualcomm Atheros, Inc.
- *
- * Permission to use, copy, modify, and/or distribute this software for any
- * purpose with or without fee is hereby granted, provided that the above
- * copyright notice and this permission notice appear in all copies.
- *
- * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
- * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
- * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
- * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
- * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
- * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
- * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
- */
-
-#include <linux/of.h>
-#include <linux/slab.h>
-#include <linux/msm-bus.h>
-
-#include "wil_platform.h"
-#include "wil_platform_msm.h"
-
-/**
- * struct wil_platform_msm - wil6210 msm platform module info
- *
- * @dev: device object
- * @msm_bus_handle: handle for using msm_bus API
- * @pdata: bus scale info retrieved from DT
- */
-struct wil_platform_msm {
- struct device *dev;
- uint32_t msm_bus_handle;
- struct msm_bus_scale_pdata *pdata;
-};
-
-#define KBTOB(a) (a * 1000ULL)
-
-/**
- * wil_platform_get_pdata() - Generate bus client data from device tree
- * provided by clients.
- *
- * dev: device object
- * of_node: Device tree node to extract information from
- *
- * The function returns a valid pointer to the allocated bus-scale-pdata
- * if the vectors were correctly read from the client's device node.
- * Any error in reading or parsing the device node will return NULL
- * to the caller.
- */
-static struct msm_bus_scale_pdata *wil_platform_get_pdata(
- struct device *dev,
- struct device_node *of_node)
-{
- struct msm_bus_scale_pdata *pdata;
- struct msm_bus_paths *usecase;
- int i, j, ret, len;
- unsigned int num_usecases, num_paths, mem_size;
- const uint32_t *vec_arr;
- struct msm_bus_vectors *vectors;
-
- /* first read num_usecases and num_paths so we can calculate
- * amount of memory to allocate
- */
- ret = of_property_read_u32(of_node, "qcom,msm-bus,num-cases",
- &num_usecases);
- if (ret) {
- dev_err(dev, "Error: num-usecases not found\n");
- return NULL;
- }
-
- ret = of_property_read_u32(of_node, "qcom,msm-bus,num-paths",
- &num_paths);
- if (ret) {
- dev_err(dev, "Error: num_paths not found\n");
- return NULL;
- }
-
- /* pdata memory layout:
- * msm_bus_scale_pdata
- * msm_bus_paths[num_usecases]
- * msm_bus_vectors[num_usecases][num_paths]
- */
- mem_size = sizeof(struct msm_bus_scale_pdata) +
- sizeof(struct msm_bus_paths) * num_usecases +
- sizeof(struct msm_bus_vectors) * num_usecases * num_paths;
-
- pdata = kzalloc(mem_size, GFP_KERNEL);
- if (!pdata)
- return NULL;
-
- ret = of_property_read_string(of_node, "qcom,msm-bus,name",
- &pdata->name);
- if (ret) {
- dev_err(dev, "Error: Client name not found\n");
- goto err;
- }
-
- if (of_property_read_bool(of_node, "qcom,msm-bus,active-only")) {
- pdata->active_only = 1;
- } else {
- dev_info(dev, "active_only flag absent.\n");
- dev_info(dev, "Using dual context by default\n");
- }
-
- pdata->num_usecases = num_usecases;
- pdata->usecase = (struct msm_bus_paths *)(pdata + 1);
-
- vec_arr = of_get_property(of_node, "qcom,msm-bus,vectors-KBps", &len);
- if (vec_arr == NULL) {
- dev_err(dev, "Error: Vector array not found\n");
- goto err;
- }
-
- if (len != num_usecases * num_paths * sizeof(uint32_t) * 4) {
- dev_err(dev, "Error: Length-error on getting vectors\n");
- goto err;
- }
-
- vectors = (struct msm_bus_vectors *)(pdata->usecase + num_usecases);
- for (i = 0; i < num_usecases; i++) {
- usecase = &pdata->usecase[i];
- usecase->num_paths = num_paths;
- usecase->vectors = &vectors[i];
-
- for (j = 0; j < num_paths; j++) {
- int index = ((i * num_paths) + j) * 4;
-
- usecase->vectors[j].src = be32_to_cpu(vec_arr[index]);
- usecase->vectors[j].dst =
- be32_to_cpu(vec_arr[index + 1]);
- usecase->vectors[j].ab = (uint64_t)
- KBTOB(be32_to_cpu(vec_arr[index + 2]));
- usecase->vectors[j].ib = (uint64_t)
- KBTOB(be32_to_cpu(vec_arr[index + 3]));
- }
- }
-
- return pdata;
-
-err:
- kfree(pdata);
-
- return NULL;
-}
-
-/* wil_platform API (callbacks) */
-
-static int wil_platform_bus_request(void *handle,
- uint32_t kbps /* KBytes/Sec */)
-{
- int rc, i;
- struct wil_platform_msm *msm = (struct wil_platform_msm *)handle;
- int vote = 0; /* vote 0 in case requested kbps cannot be satisfied */
- struct msm_bus_paths *usecase;
- uint32_t usecase_kbps;
- uint32_t min_kbps = ~0;
-
- /* find the lowest usecase that is bigger than requested kbps */
- for (i = 0; i < msm->pdata->num_usecases; i++) {
- usecase = &msm->pdata->usecase[i];
- /* assume we have single path (vectors[0]). If we ever
- * have multiple paths, need to define the behavior */
- usecase_kbps = div64_u64(usecase->vectors[0].ib, 1000);
- if (usecase_kbps >= kbps && usecase_kbps < min_kbps) {
- min_kbps = usecase_kbps;
- vote = i;
- }
- }
-
- rc = msm_bus_scale_client_update_request(msm->msm_bus_handle, vote);
- if (rc)
- dev_err(msm->dev, "Failed msm_bus voting. kbps=%d vote=%d, rc=%d\n",
- kbps, vote, rc);
- else
- /* TOOD: remove */
- dev_info(msm->dev, "msm_bus_scale_client_update_request succeeded. kbps=%d vote=%d\n",
- kbps, vote);
-
- return rc;
-}
-
-static void wil_platform_uninit(void *handle)
-{
- struct wil_platform_msm *msm = (struct wil_platform_msm *)handle;
-
- dev_info(msm->dev, "wil_platform_uninit\n");
-
- if (msm->msm_bus_handle)
- msm_bus_scale_unregister_client(msm->msm_bus_handle);
-
- kfree(msm->pdata);
- kfree(msm);
-}
-
-static int wil_platform_msm_bus_register(struct wil_platform_msm *msm,
- struct device_node *node)
-{
- msm->pdata = wil_platform_get_pdata(msm->dev, node);
- if (!msm->pdata) {
- dev_err(msm->dev, "Failed getting DT info\n");
- return -EINVAL;
- }
-
- msm->msm_bus_handle = msm_bus_scale_register_client(msm->pdata);
- if (!msm->msm_bus_handle) {
- dev_err(msm->dev, "Failed msm_bus registration\n");
- return -EINVAL;
- }
-
- dev_info(msm->dev, "msm_bus registration succeeded! handle 0x%x\n",
- msm->msm_bus_handle);
-
- return 0;
-}
-
-/**
- * wil_platform_msm_init() - wil6210 msm platform module init
- *
- * The function must be called before all other functions in this module.
- * It returns a handle which is used with the rest of the API
- *
- */
-void *wil_platform_msm_init(struct device *dev, struct wil_platform_ops *ops)
-{
- struct device_node *of_node;
- struct wil_platform_msm *msm;
- int rc;
-
- of_node = of_find_compatible_node(NULL, NULL, "qcom,wil6210");
- if (!of_node) {
- /* this could mean non-msm platform */
- dev_err(dev, "DT node not found\n");
- return NULL;
- }
-
- msm = kzalloc(sizeof(*msm), GFP_KERNEL);
- if (!msm)
- return NULL;
-
- msm->dev = dev;
-
- /* register with msm_bus module for scaling requests */
- rc = wil_platform_msm_bus_register(msm, of_node);
- if (rc)
- goto cleanup;
-
- memset(ops, 0, sizeof(*ops));
- ops->bus_request = wil_platform_bus_request;
- ops->uninit = wil_platform_uninit;
-
- return (void *)msm;
-
-cleanup:
- kfree(msm);
- return NULL;
-}
projects / platform / kernel / linux-exynos.git / commitdiff