| /* |
| * Google LWIS Clock Interface |
| * |
| * Copyright (c) 2018 Google, LLC |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License version 2 as |
| * published by the Free Software Foundation. |
| */ |
| |
| #define pr_fmt(fmt) KBUILD_MODNAME "-clock: " fmt |
| |
| #include <linux/kernel.h> |
| #include <linux/slab.h> |
| |
| #include "lwis_clock.h" |
| |
| struct lwis_clock_list *lwis_clock_list_alloc(int num_clks) |
| { |
| struct lwis_clock_list *list; |
| |
| /* No need to allocate if num_clks is invalid */ |
| if (num_clks <= 0) { |
| return ERR_PTR(-EINVAL); |
| } |
| |
| list = kmalloc(sizeof(struct lwis_clock_list), GFP_KERNEL); |
| if (!list) { |
| return ERR_PTR(-ENOMEM); |
| } |
| |
| list->clk = kzalloc(num_clks * sizeof(struct lwis_clock), GFP_KERNEL); |
| if (!list->clk) { |
| kfree(list); |
| return ERR_PTR(-ENOMEM); |
| } |
| |
| list->count = num_clks; |
| |
| return list; |
| } |
| |
| void lwis_clock_list_free(struct lwis_clock_list *list) |
| { |
| if (!list) { |
| return; |
| } |
| |
| if (list->clk) { |
| kfree(list->clk); |
| } |
| |
| kfree(list); |
| } |
| |
| int lwis_clock_get(struct lwis_clock_list *list, char *name, struct device *dev, uint32_t rate) |
| { |
| struct clk *clk; |
| int i; |
| int index = -1; |
| |
| if (!dev || !list) { |
| return -EINVAL; |
| } |
| |
| /* Look for empty slot and duplicate entries */ |
| for (i = 0; i < list->count; ++i) { |
| if (list->clk[i].clk == NULL) { |
| index = i; |
| break; |
| } else if (!strcmp(list->clk[i].name, name)) { |
| pr_info("Clock %s already allocated\n", name); |
| return i; |
| } |
| } |
| |
| /* No empty slot */ |
| if (index < 0) { |
| pr_err("No empty slots in the lwis_clock struct\n"); |
| return -ENOMEM; |
| } |
| |
| /* Make sure clock exists */ |
| clk = devm_clk_get(dev, name); |
| if (IS_ERR(clk)) { |
| pr_err("Clock %s not found\n", name); |
| return PTR_ERR(clk); |
| } |
| |
| list->clk[index].clk = clk; |
| list->clk[index].name = name; |
| list->clk[index].rate = rate; |
| |
| return index; |
| } |
| |
| int lwis_clock_put_by_idx(struct lwis_clock_list *list, int index, struct device *dev) |
| { |
| if (!dev || !list || index < 0 || index >= list->count) { |
| return -EINVAL; |
| } |
| |
| if (IS_ERR_OR_NULL(list->clk[index].clk)) { |
| return -EINVAL; |
| } |
| |
| devm_clk_put(dev, list->clk[index].clk); |
| memset(list->clk + index, 0, sizeof(struct lwis_clock)); |
| |
| return 0; |
| } |
| |
| int lwis_clock_put_by_name(struct lwis_clock_list *list, char *name, struct device *dev) |
| { |
| int i; |
| |
| if (!dev || !list) { |
| return -EINVAL; |
| } |
| |
| /* Find entry by name */ |
| for (i = 0; i < list->count; ++i) { |
| if (!strcmp(list->clk[i].name, name)) { |
| if (IS_ERR_OR_NULL(list->clk[i].clk)) { |
| return -EINVAL; |
| } |
| devm_clk_put(dev, list->clk[i].clk); |
| memset(list->clk + i, 0, sizeof(struct lwis_clock)); |
| return 0; |
| } |
| } |
| |
| pr_err("Clock %s not found\n", name); |
| return -EINVAL; |
| } |
| |
| int lwis_clock_enable_by_idx(struct lwis_clock_list *list, int index) |
| { |
| int ret = 0; |
| |
| if (!list || index < 0 || index >= list->count) { |
| return -EINVAL; |
| } |
| |
| ret = clk_prepare_enable(list->clk[index].clk); |
| if (ret) { |
| return ret; |
| } |
| |
| if (list->clk[index].rate > 0) { |
| ret = clk_set_rate(list->clk[index].clk, list->clk[index].rate); |
| } |
| |
| return ret; |
| } |
| |
| int lwis_clock_enable_by_name(struct lwis_clock_list *list, char *name) |
| { |
| int i; |
| |
| if (!list) { |
| return -EINVAL; |
| } |
| |
| for (i = 0; i < list->count; ++i) { |
| if (!strcmp(list->clk[i].name, name)) { |
| return lwis_clock_enable_by_idx(list, i); |
| } |
| } |
| |
| pr_err("Clock %s not found\n", name); |
| return -ENOENT; |
| } |
| |
| int lwis_clock_enable_all(struct lwis_clock_list *list) |
| { |
| int i; |
| int ret; |
| |
| if (!list) { |
| return -EINVAL; |
| } |
| |
| for (i = 0; i < list->count; ++i) { |
| ret = lwis_clock_enable_by_idx(list, i); |
| if (ret) { |
| pr_err("Error enabling clock %s\n", list->clk[i].name); |
| return ret; |
| } |
| } |
| |
| return 0; |
| } |
| |
| void lwis_clock_disable_by_idx(struct lwis_clock_list *list, int index) |
| { |
| if (!list || index < 0 || index >= list->count) { |
| return; |
| } |
| |
| clk_disable_unprepare(list->clk[index].clk); |
| } |
| |
| void lwis_clock_disable_by_name(struct lwis_clock_list *list, char *name) |
| { |
| int i; |
| |
| if (!list) { |
| return; |
| } |
| |
| for (i = 0; i < list->count; ++i) { |
| if (!strcmp(list->clk[i].name, name)) { |
| lwis_clock_disable_by_idx(list, i); |
| return; |
| } |
| } |
| |
| pr_err("Clock %s not found\n", name); |
| } |
| |
| void lwis_clock_disable_all(struct lwis_clock_list *list) |
| { |
| int i; |
| |
| if (!list) { |
| return; |
| } |
| |
| for (i = 0; i < list->count; ++i) { |
| lwis_clock_disable_by_idx(list, i); |
| } |
| } |
| |
| void lwis_clock_print(struct lwis_clock_list *list) |
| { |
| int i; |
| for (i = 0; i < list->count; ++i) { |
| pr_info("%s: %s: rate: %d\n", __func__, list->clk[i].name, list->clk[i].rate); |
| } |
| } |