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/* Copyright (c) 2012-2015, 2017-2018, The Linux Foundation.
* All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 and
* only version 2 as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#include <linux/clk.h>
#include <linux/clk/clk-conf.h>
#include <linux/err.h>
#include <linux/delay.h>
#include <drm/drm_print.h>
#include "dpu_io_util.h"
void msm_dss_put_clk(struct dss_clk *clk_arry, int num_clk)
{
int i;
for (i = num_clk - 1; i >= 0; i--) {
if (clk_arry[i].clk)
clk_put(clk_arry[i].clk);
clk_arry[i].clk = NULL;
}
}
int msm_dss_get_clk(struct device *dev, struct dss_clk *clk_arry, int num_clk)
{
int i, rc = 0;
for (i = 0; i < num_clk; i++) {
clk_arry[i].clk = clk_get(dev, clk_arry[i].clk_name);
rc = PTR_ERR_OR_ZERO(clk_arry[i].clk);
if (rc) {
DEV_ERR("%pS->%s: '%s' get failed. rc=%d\n",
__builtin_return_address(0), __func__,
clk_arry[i].clk_name, rc);
goto error;
}
}
return rc;
error:
for (i--; i >= 0; i--) {
if (clk_arry[i].clk)
clk_put(clk_arry[i].clk);
clk_arry[i].clk = NULL;
}
return rc;
}
int msm_dss_clk_set_rate(struct dss_clk *clk_arry, int num_clk)
{
int i, rc = 0;
for (i = 0; i < num_clk; i++) {
if (clk_arry[i].clk) {
if (clk_arry[i].type != DSS_CLK_AHB) {
DEV_DBG("%pS->%s: '%s' rate %ld\n",
__builtin_return_address(0), __func__,
clk_arry[i].clk_name,
clk_arry[i].rate);
rc = clk_set_rate(clk_arry[i].clk,
clk_arry[i].rate);
if (rc) {
DEV_ERR("%pS->%s: %s failed. rc=%d\n",
__builtin_return_address(0),
__func__,
clk_arry[i].clk_name, rc);
break;
}
}
} else {
DEV_ERR("%pS->%s: '%s' is not available\n",
__builtin_return_address(0), __func__,
clk_arry[i].clk_name);
rc = -EPERM;
break;
}
}
return rc;
}
int msm_dss_enable_clk(struct dss_clk *clk_arry, int num_clk, int enable)
{
int i, rc = 0;
if (enable) {
for (i = 0; i < num_clk; i++) {
DEV_DBG("%pS->%s: enable '%s'\n",
__builtin_return_address(0), __func__,
clk_arry[i].clk_name);
if (clk_arry[i].clk) {
rc = clk_prepare_enable(clk_arry[i].clk);
if (rc)
DEV_ERR("%pS->%s: %s en fail. rc=%d\n",
__builtin_return_address(0),
__func__,
clk_arry[i].clk_name, rc);
} else {
DEV_ERR("%pS->%s: '%s' is not available\n",
__builtin_return_address(0), __func__,
clk_arry[i].clk_name);
rc = -EPERM;
}
if (rc) {
msm_dss_enable_clk(&clk_arry[i],
i, false);
break;
}
}
} else {
for (i = num_clk - 1; i >= 0; i--) {
DEV_DBG("%pS->%s: disable '%s'\n",
__builtin_return_address(0), __func__,
clk_arry[i].clk_name);
if (clk_arry[i].clk)
clk_disable_unprepare(clk_arry[i].clk);
else
DEV_ERR("%pS->%s: '%s' is not available\n",
__builtin_return_address(0), __func__,
clk_arry[i].clk_name);
}
}
return rc;
}
int msm_dss_parse_clock(struct platform_device *pdev,
struct dss_module_power *mp)
{
u32 i, rc = 0;
const char *clock_name;
int num_clk = 0;
if (!pdev || !mp)
return -EINVAL;
mp->num_clk = 0;
num_clk = of_property_count_strings(pdev->dev.of_node, "clock-names");
if (num_clk <= 0) {
pr_debug("clocks are not defined\n");
return 0;
}
mp->clk_config = devm_kcalloc(&pdev->dev,
num_clk, sizeof(struct dss_clk),
GFP_KERNEL);
if (!mp->clk_config)
return -ENOMEM;
for (i = 0; i < num_clk; i++) {
rc = of_property_read_string_index(pdev->dev.of_node,
"clock-names", i,
&clock_name);
if (rc) {
DRM_DEV_ERROR(&pdev->dev, "Failed to get clock name for %d\n",
i);
break;
}
strlcpy(mp->clk_config[i].clk_name, clock_name,
sizeof(mp->clk_config[i].clk_name));
mp->clk_config[i].type = DSS_CLK_AHB;
}
rc = msm_dss_get_clk(&pdev->dev, mp->clk_config, num_clk);
if (rc) {
DRM_DEV_ERROR(&pdev->dev, "Failed to get clock refs %d\n", rc);
goto err;
}
rc = of_clk_set_defaults(pdev->dev.of_node, false);
if (rc) {
DRM_DEV_ERROR(&pdev->dev, "Failed to set clock defaults %d\n", rc);
goto err;
}
for (i = 0; i < num_clk; i++) {
u32 rate = clk_get_rate(mp->clk_config[i].clk);
if (!rate)
continue;
mp->clk_config[i].rate = rate;
mp->clk_config[i].type = DSS_CLK_PCLK;
}
mp->num_clk = num_clk;
return 0;
err:
msm_dss_put_clk(mp->clk_config, num_clk);
return rc;
}
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