Quelle  dcss-dev.c   Sprache: C

// SPDX-License-Identifier: GPL-2.0
/*
 * Copyright 2019 NXP.
 */

#include <linux/clk.h>
#include <linux/of.h>
#include <linux/of_graph.h>
#include <linux/platform_device.h>
#include <linux/pm_runtime.h>
#include <linux/slab.h>
#include <drm/drm_bridge_connector.h>
#include <drm/drm_device.h>
#include <drm/drm_modeset_helper.h>

#include "dcss-dev.h"
#include "dcss-kms.h"

static void dcss_clocks_enable(struct dcss_dev *dcss)
{
 clk_prepare_enable(dcss->axi_clk);
 clk_prepare_enable(dcss->apb_clk);
 clk_prepare_enable(dcss->rtrm_clk);
 clk_prepare_enable(dcss->dtrc_clk);
 clk_prepare_enable(dcss->pix_clk);
}

static void dcss_clocks_disable(struct dcss_dev *dcss)
{
 clk_disable_unprepare(dcss->pix_clk);
 clk_disable_unprepare(dcss->dtrc_clk);
 clk_disable_unprepare(dcss->rtrm_clk);
 clk_disable_unprepare(dcss->apb_clk);
 clk_disable_unprepare(dcss->axi_clk);
}

static void dcss_disable_dtg_and_ss_cb(void *data)
{
 struct dcss_dev *dcss = data;

 dcss->disable_callback = NULL;

 dcss_ss_shutoff(dcss->ss);
 dcss_dtg_shutoff(dcss->dtg);

 complete(&dcss->disable_completion);
}

void dcss_disable_dtg_and_ss(struct dcss_dev *dcss)
{
 dcss->disable_callback = dcss_disable_dtg_and_ss_cb;
}

void dcss_enable_dtg_and_ss(struct dcss_dev *dcss)
{
 if (dcss->disable_callback)
  dcss->disable_callback = NULL;

 dcss_dtg_enable(dcss->dtg);
 dcss_ss_enable(dcss->ss);
}

static int dcss_submodules_init(struct dcss_dev *dcss)
{
 int ret = 0;
 u32 base_addr = dcss->start_addr;
 const struct dcss_type_data *devtype = dcss->devtype;

 dcss_clocks_enable(dcss);

 ret = dcss_blkctl_init(dcss, base_addr + devtype->blkctl_ofs);
 if (ret)
  return ret;

 ret = dcss_ctxld_init(dcss, base_addr + devtype->ctxld_ofs);
 if (ret)
  goto ctxld_err;

 ret = dcss_dtg_init(dcss, base_addr + devtype->dtg_ofs);
 if (ret)
  goto dtg_err;

 ret = dcss_ss_init(dcss, base_addr + devtype->ss_ofs);
 if (ret)
  goto ss_err;

 ret = dcss_dpr_init(dcss, base_addr + devtype->dpr_ofs);
 if (ret)
  goto dpr_err;

 ret = dcss_scaler_init(dcss, base_addr + devtype->scaler_ofs);
 if (ret)
  goto scaler_err;

 dcss_clocks_disable(dcss);

 return 0;

scaler_err:
 dcss_dpr_exit(dcss->dpr);

dpr_err:
 dcss_ss_exit(dcss->ss);

ss_err:
 dcss_dtg_exit(dcss->dtg);

dtg_err:
 dcss_ctxld_exit(dcss->ctxld);

ctxld_err:
 dcss_clocks_disable(dcss);

 return ret;
}

static void dcss_submodules_stop(struct dcss_dev *dcss)
{
 dcss_clocks_enable(dcss);
 dcss_scaler_exit(dcss->scaler);
 dcss_dpr_exit(dcss->dpr);
 dcss_ss_exit(dcss->ss);
 dcss_dtg_exit(dcss->dtg);
 dcss_ctxld_exit(dcss->ctxld);
 dcss_clocks_disable(dcss);
}

static int dcss_clks_init(struct dcss_dev *dcss)
{
 int i;
 struct {
  const char *id;
  struct clk **clk;
 } clks[] = {
  {"apb",   &dcss->apb_clk},
  {"axi",   &dcss->axi_clk},
  {"pix",   &dcss->pix_clk},
  {"rtrm",  &dcss->rtrm_clk},
  {"dtrc",  &dcss->dtrc_clk},
 };

 for (i = 0; i < ARRAY_SIZE(clks); i++) {
  *clks[i].clk = devm_clk_get(dcss->dev, clks[i].id);
  if (IS_ERR(*clks[i].clk)) {
   dev_err(dcss->dev, "failed to get %s clock\n",
    clks[i].id);
   return PTR_ERR(*clks[i].clk);
  }
 }

 return 0;
}

static void dcss_clks_release(struct dcss_dev *dcss)
{
 devm_clk_put(dcss->dev, dcss->dtrc_clk);
 devm_clk_put(dcss->dev, dcss->rtrm_clk);
 devm_clk_put(dcss->dev, dcss->pix_clk);
 devm_clk_put(dcss->dev, dcss->axi_clk);
 devm_clk_put(dcss->dev, dcss->apb_clk);
}

struct dcss_dev *dcss_dev_create(struct device *dev, bool hdmi_output)
{
 struct platform_device *pdev = to_platform_device(dev);
 int ret;
 struct resource *res;
 struct dcss_dev *dcss;
 const struct dcss_type_data *devtype;

 devtype = of_device_get_match_data(dev);
 if (!devtype) {
  dev_err(dev, "no device match found\n");
  return ERR_PTR(-ENODEV);
 }

 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 if (!res) {
  dev_err(dev, "cannot get memory resource\n");
  return ERR_PTR(-EINVAL);
 }

 if (!devm_request_mem_region(dev, res->start, resource_size(res), "dcss")) {
  dev_err(dev, "cannot request memory region\n");
  return ERR_PTR(-EBUSY);
 }

 dcss = devm_kzalloc(dev, sizeof(*dcss), GFP_KERNEL);
 if (!dcss)
  return ERR_PTR(-ENOMEM);

 dcss->dev = dev;
 dcss->devtype = devtype;
 dcss->hdmi_output = hdmi_output;

 ret = dcss_clks_init(dcss);
 if (ret) {
  dev_err(dev, "clocks initialization failed\n");
  return ERR_PTR(ret);
 }

 dcss->of_port = of_graph_get_port_by_id(dev->of_node, 0);
 if (!dcss->of_port) {
  dev_err(dev, "no port@0 node in %pOF\n", dev->of_node);
  ret = -ENODEV;
  goto clks_err;
 }

 dcss->start_addr = res->start;

 ret = dcss_submodules_init(dcss);
 if (ret) {
  of_node_put(dcss->of_port);
  dev_err(dev, "submodules initialization failed\n");
  goto clks_err;
 }

 init_completion(&dcss->disable_completion);

 pm_runtime_set_autosuspend_delay(dev, 100);
 pm_runtime_use_autosuspend(dev);
 pm_runtime_set_suspended(dev);
 pm_runtime_allow(dev);
 pm_runtime_enable(dev);

 return dcss;

clks_err:
 dcss_clks_release(dcss);

 return ERR_PTR(ret);
}

void dcss_dev_destroy(struct dcss_dev *dcss)
{
 if (!pm_runtime_suspended(dcss->dev)) {
  dcss_ctxld_suspend(dcss->ctxld);
  dcss_clocks_disable(dcss);
 }

 of_node_put(dcss->of_port);

 pm_runtime_disable(dcss->dev);

 dcss_submodules_stop(dcss);

 dcss_clks_release(dcss);
}

static int dcss_dev_suspend(struct device *dev)
{
 struct dcss_dev *dcss = dcss_drv_dev_to_dcss(dev);
 struct drm_device *ddev = dcss_drv_dev_to_drm(dev);
 int ret;

 drm_mode_config_helper_suspend(ddev);

 if (pm_runtime_suspended(dev))
  return 0;

 ret = dcss_ctxld_suspend(dcss->ctxld);
 if (ret)
  return ret;

 dcss_clocks_disable(dcss);

 return 0;
}

static int dcss_dev_resume(struct device *dev)
{
 struct dcss_dev *dcss = dcss_drv_dev_to_dcss(dev);
 struct drm_device *ddev = dcss_drv_dev_to_drm(dev);

 if (pm_runtime_suspended(dev)) {
  drm_mode_config_helper_resume(ddev);
  return 0;
 }

 dcss_clocks_enable(dcss);

 dcss_blkctl_cfg(dcss->blkctl);

 dcss_ctxld_resume(dcss->ctxld);

 drm_mode_config_helper_resume(ddev);

 return 0;
}

static int dcss_dev_runtime_suspend(struct device *dev)
{
 struct dcss_dev *dcss = dcss_drv_dev_to_dcss(dev);
 int ret;

 ret = dcss_ctxld_suspend(dcss->ctxld);
 if (ret)
  return ret;

 dcss_clocks_disable(dcss);

 return 0;
}

static int dcss_dev_runtime_resume(struct device *dev)
{
 struct dcss_dev *dcss = dcss_drv_dev_to_dcss(dev);

 dcss_clocks_enable(dcss);

 dcss_blkctl_cfg(dcss->blkctl);

 dcss_ctxld_resume(dcss->ctxld);

 return 0;
}

EXPORT_GPL_DEV_PM_OPS(dcss_dev_pm_ops) = {
 RUNTIME_PM_OPS(dcss_dev_runtime_suspend, dcss_dev_runtime_resume, NULL)
 SYSTEM_SLEEP_PM_OPS(dcss_dev_suspend, dcss_dev_resume)
};