260 lines
6.7 KiB
C
260 lines
6.7 KiB
C
/* Copyright (c) 2018, The Linux Foundation. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 and
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* only version 2 as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#define pr_fmt(fmt) "%s:%s " fmt, KBUILD_MODNAME, __func__
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#include <linux/module.h>
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#include <linux/platform_device.h>
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#include <linux/thermal.h>
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#include <linux/err.h>
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#include <linux/slab.h>
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#include <linux/io.h>
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#define CXIP_LM_CDEV_DRIVER "cx-ipeak-cooling-device"
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#define CXIP_LM_CDEV_MAX_STATE 1
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#define CXIP_LM_VOTE_STATUS 0x0
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#define CXIP_LM_BYPASS 0x4
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#define CXIP_LM_VOTE_CLEAR 0x8
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#define CXIP_LM_VOTE_SET 0xc
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#define CXIP_LM_FEATURE_EN 0x10
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#define CXIP_LM_BYPASS_VAL 0xff20
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#define CXIP_LM_THERM_VOTE_VAL 0x80
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#define CXIP_LM_FEATURE_EN_VAL 0x1
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struct cxip_lm_cooling_device {
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struct thermal_cooling_device *cool_dev;
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char cdev_name[THERMAL_NAME_LENGTH];
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void *cx_ip_reg_base;
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unsigned int therm_clnt;
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unsigned int *bypass_clnts;
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unsigned int bypass_clnt_cnt;
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bool state;
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};
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static void cxip_lm_therm_vote_apply(struct cxip_lm_cooling_device *cxip_dev,
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bool vote)
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{
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int vote_offset = 0, val = 0, sts_offset = 0;
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if (!cxip_dev->therm_clnt) {
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vote_offset = vote ? CXIP_LM_VOTE_SET : CXIP_LM_VOTE_CLEAR;
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val = CXIP_LM_THERM_VOTE_VAL;
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sts_offset = CXIP_LM_VOTE_STATUS;
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} else {
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vote_offset = cxip_dev->therm_clnt;
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val = vote ? 0x1 : 0x0;
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sts_offset = vote_offset;
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}
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writel_relaxed(val, cxip_dev->cx_ip_reg_base + vote_offset);
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pr_debug("%s vote for cxip_lm. vote:0x%x\n",
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vote ? "Applied" : "Cleared",
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readl_relaxed(cxip_dev->cx_ip_reg_base + sts_offset));
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}
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static void cxip_lm_initialize_cxip_hw(struct cxip_lm_cooling_device *cxip_dev)
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{
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int i = 0;
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/* Set CXIP LM proxy vote for clients who are not participating */
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if (cxip_dev->bypass_clnt_cnt)
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for (i = 0; i < cxip_dev->bypass_clnt_cnt; i++)
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writel_relaxed(0x1, cxip_dev->cx_ip_reg_base +
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cxip_dev->bypass_clnts[i]);
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else if (!cxip_dev->therm_clnt)
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writel_relaxed(CXIP_LM_BYPASS_VAL,
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cxip_dev->cx_ip_reg_base + CXIP_LM_BYPASS);
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/* Enable CXIP LM HW */
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writel_relaxed(CXIP_LM_FEATURE_EN_VAL, cxip_dev->cx_ip_reg_base +
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CXIP_LM_FEATURE_EN);
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}
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static int cxip_lm_get_max_state(struct thermal_cooling_device *cdev,
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unsigned long *state)
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{
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*state = CXIP_LM_CDEV_MAX_STATE;
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return 0;
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}
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static int cxip_lm_set_cur_state(struct thermal_cooling_device *cdev,
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unsigned long state)
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{
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struct cxip_lm_cooling_device *cxip_dev = cdev->devdata;
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int ret = 0;
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if (state > CXIP_LM_CDEV_MAX_STATE)
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state = CXIP_LM_CDEV_MAX_STATE;
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if (cxip_dev->state == state)
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return 0;
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cxip_lm_therm_vote_apply(cxip_dev, state);
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cxip_dev->state = state;
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return ret;
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}
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static int cxip_lm_get_cur_state(struct thermal_cooling_device *cdev,
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unsigned long *state)
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{
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struct cxip_lm_cooling_device *cxip_dev = cdev->devdata;
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*state = cxip_dev->state;
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return 0;
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}
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static struct thermal_cooling_device_ops cxip_lm_device_ops = {
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.get_max_state = cxip_lm_get_max_state,
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.get_cur_state = cxip_lm_get_cur_state,
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.set_cur_state = cxip_lm_set_cur_state,
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};
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static int cxip_lm_cdev_remove(struct platform_device *pdev)
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{
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struct cxip_lm_cooling_device *cxip_dev =
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(struct cxip_lm_cooling_device *)dev_get_drvdata(&pdev->dev);
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if (cxip_dev) {
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if (cxip_dev->cool_dev)
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thermal_cooling_device_unregister(cxip_dev->cool_dev);
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if (cxip_dev->cx_ip_reg_base)
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cxip_lm_therm_vote_apply(cxip_dev->cx_ip_reg_base,
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false);
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}
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return 0;
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}
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static int cxip_lm_get_devicetree_data(struct platform_device *pdev,
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struct cxip_lm_cooling_device *cxip_dev,
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struct device_node *np)
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{
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int ret = 0;
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ret = of_property_read_u32(np, "qcom,thermal-client-offset",
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&cxip_dev->therm_clnt);
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if (ret) {
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dev_dbg(&pdev->dev,
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"error for qcom,thermal-client-offset. ret:%d\n",
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ret);
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cxip_dev->therm_clnt = 0;
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ret = 0;
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return ret;
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}
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ret = of_property_count_u32_elems(np, "qcom,bypass-client-list");
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if (ret <= 0) {
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dev_dbg(&pdev->dev, "Invalid number of clients err:%d\n", ret);
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ret = 0;
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return ret;
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}
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cxip_dev->bypass_clnt_cnt = ret;
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cxip_dev->bypass_clnts = devm_kcalloc(&pdev->dev,
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cxip_dev->bypass_clnt_cnt,
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sizeof(*cxip_dev->bypass_clnts), GFP_KERNEL);
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if (!cxip_dev->bypass_clnts)
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return -ENOMEM;
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ret = of_property_read_u32_array(np, "qcom,bypass-client-list",
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cxip_dev->bypass_clnts, cxip_dev->bypass_clnt_cnt);
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if (ret) {
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dev_dbg(&pdev->dev, "bypass client list err:%d, cnt:%d\n",
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ret, cxip_dev->bypass_clnt_cnt);
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cxip_dev->bypass_clnt_cnt = 0;
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ret = 0;
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}
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return ret;
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}
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static int cxip_lm_cdev_probe(struct platform_device *pdev)
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{
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struct cxip_lm_cooling_device *cxip_dev = NULL;
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int ret = 0;
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struct device_node *np;
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struct resource *res = NULL;
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np = dev_of_node(&pdev->dev);
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if (!np) {
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dev_err(&pdev->dev,
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"of node not available for cxip_lm cdev\n");
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return -EINVAL;
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}
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cxip_dev = devm_kzalloc(&pdev->dev, sizeof(*cxip_dev), GFP_KERNEL);
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if (!cxip_dev)
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return -ENOMEM;
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ret = cxip_lm_get_devicetree_data(pdev, cxip_dev, np);
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if (ret)
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return ret;
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res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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if (!res) {
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dev_err(&pdev->dev,
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"cxip_lm platform get resource failed\n");
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return -ENODEV;
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}
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cxip_dev->cx_ip_reg_base = devm_ioremap(&pdev->dev, res->start,
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resource_size(res));
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if (!cxip_dev->cx_ip_reg_base) {
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dev_err(&pdev->dev, "cxip_lm reg remap failed\n");
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return -ENOMEM;
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}
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cxip_lm_initialize_cxip_hw(cxip_dev);
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/* Set thermal vote till we get first vote from TF */
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cxip_dev->state = true;
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cxip_lm_therm_vote_apply(cxip_dev, cxip_dev->state);
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strlcpy(cxip_dev->cdev_name, np->name, THERMAL_NAME_LENGTH);
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cxip_dev->cool_dev = thermal_of_cooling_device_register(
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np, cxip_dev->cdev_name, cxip_dev,
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&cxip_lm_device_ops);
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if (IS_ERR(cxip_dev->cool_dev)) {
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ret = PTR_ERR(cxip_dev->cool_dev);
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dev_err(&pdev->dev, "cxip_lm cdev register err:%d\n",
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ret);
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cxip_dev->cool_dev = NULL;
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cxip_lm_therm_vote_apply(cxip_dev->cx_ip_reg_base,
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false);
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return ret;
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}
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dev_set_drvdata(&pdev->dev, cxip_dev);
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return ret;
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}
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static const struct of_device_id cxip_lm_cdev_of_match[] = {
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{.compatible = "qcom,cxip-lm-cooling-device", },
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{}
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};
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static struct platform_driver cxip_lm_cdev_driver = {
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.driver = {
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.name = CXIP_LM_CDEV_DRIVER,
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.of_match_table = cxip_lm_cdev_of_match,
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},
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.probe = cxip_lm_cdev_probe,
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.remove = cxip_lm_cdev_remove,
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};
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builtin_platform_driver(cxip_lm_cdev_driver);
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