mirror of https://gitee.com/openkylin/linux.git
149 lines
3.4 KiB
C
149 lines
3.4 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
/*
|
|
* Platform UFS Host driver for Cadence controller
|
|
*
|
|
* Copyright (C) 2018 Cadence Design Systems, Inc.
|
|
*
|
|
* Authors:
|
|
* Jan Kotas <jank@cadence.com>
|
|
*
|
|
*/
|
|
|
|
#include <linux/kernel.h>
|
|
#include <linux/module.h>
|
|
#include <linux/platform_device.h>
|
|
#include <linux/of.h>
|
|
#include <linux/time.h>
|
|
|
|
#include "ufshcd-pltfrm.h"
|
|
|
|
#define CDNS_UFS_REG_HCLKDIV 0xFC
|
|
|
|
/**
|
|
* Sets HCLKDIV register value based on the core_clk
|
|
* @hba: host controller instance
|
|
*
|
|
* Return zero for success and non-zero for failure
|
|
*/
|
|
static int cdns_ufs_set_hclkdiv(struct ufs_hba *hba)
|
|
{
|
|
struct ufs_clk_info *clki;
|
|
struct list_head *head = &hba->clk_list_head;
|
|
unsigned long core_clk_rate = 0;
|
|
u32 core_clk_div = 0;
|
|
|
|
if (list_empty(head))
|
|
return 0;
|
|
|
|
list_for_each_entry(clki, head, list) {
|
|
if (IS_ERR_OR_NULL(clki->clk))
|
|
continue;
|
|
if (!strcmp(clki->name, "core_clk"))
|
|
core_clk_rate = clk_get_rate(clki->clk);
|
|
}
|
|
|
|
if (!core_clk_rate) {
|
|
dev_err(hba->dev, "%s: unable to find core_clk rate\n",
|
|
__func__);
|
|
return -EINVAL;
|
|
}
|
|
|
|
core_clk_div = core_clk_rate / USEC_PER_SEC;
|
|
|
|
ufshcd_writel(hba, core_clk_div, CDNS_UFS_REG_HCLKDIV);
|
|
/**
|
|
* Make sure the register was updated,
|
|
* UniPro layer will not work with an incorrect value.
|
|
*/
|
|
mb();
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* Sets clocks used by the controller
|
|
* @hba: host controller instance
|
|
* @on: if true, enable clocks, otherwise disable
|
|
* @status: notify stage (pre, post change)
|
|
*
|
|
* Return zero for success and non-zero for failure
|
|
*/
|
|
static int cdns_ufs_setup_clocks(struct ufs_hba *hba, bool on,
|
|
enum ufs_notify_change_status status)
|
|
{
|
|
if ((!on) || (status == PRE_CHANGE))
|
|
return 0;
|
|
|
|
return cdns_ufs_set_hclkdiv(hba);
|
|
}
|
|
|
|
static struct ufs_hba_variant_ops cdns_pltfm_hba_vops = {
|
|
.name = "cdns-ufs-pltfm",
|
|
.setup_clocks = cdns_ufs_setup_clocks,
|
|
};
|
|
|
|
/**
|
|
* cdns_ufs_pltfrm_probe - probe routine of the driver
|
|
* @pdev: pointer to platform device handle
|
|
*
|
|
* Return zero for success and non-zero for failure
|
|
*/
|
|
static int cdns_ufs_pltfrm_probe(struct platform_device *pdev)
|
|
{
|
|
int err;
|
|
struct device *dev = &pdev->dev;
|
|
|
|
/* Perform generic probe */
|
|
err = ufshcd_pltfrm_init(pdev, &cdns_pltfm_hba_vops);
|
|
if (err)
|
|
dev_err(dev, "ufshcd_pltfrm_init() failed %d\n", err);
|
|
|
|
return err;
|
|
}
|
|
|
|
/**
|
|
* cdns_ufs_pltfrm_remove - removes the ufs driver
|
|
* @pdev: pointer to platform device handle
|
|
*
|
|
* Always returns 0
|
|
*/
|
|
static int cdns_ufs_pltfrm_remove(struct platform_device *pdev)
|
|
{
|
|
struct ufs_hba *hba = platform_get_drvdata(pdev);
|
|
|
|
ufshcd_remove(hba);
|
|
return 0;
|
|
}
|
|
|
|
static const struct of_device_id cdns_ufs_of_match[] = {
|
|
{ .compatible = "cdns,ufshc" },
|
|
{},
|
|
};
|
|
|
|
MODULE_DEVICE_TABLE(of, cdns_ufs_of_match);
|
|
|
|
static const struct dev_pm_ops cdns_ufs_dev_pm_ops = {
|
|
.suspend = ufshcd_pltfrm_suspend,
|
|
.resume = ufshcd_pltfrm_resume,
|
|
.runtime_suspend = ufshcd_pltfrm_runtime_suspend,
|
|
.runtime_resume = ufshcd_pltfrm_runtime_resume,
|
|
.runtime_idle = ufshcd_pltfrm_runtime_idle,
|
|
};
|
|
|
|
static struct platform_driver cdns_ufs_pltfrm_driver = {
|
|
.probe = cdns_ufs_pltfrm_probe,
|
|
.remove = cdns_ufs_pltfrm_remove,
|
|
.driver = {
|
|
.name = "cdns-ufshcd",
|
|
.pm = &cdns_ufs_dev_pm_ops,
|
|
.of_match_table = cdns_ufs_of_match,
|
|
},
|
|
};
|
|
|
|
module_platform_driver(cdns_ufs_pltfrm_driver);
|
|
|
|
MODULE_AUTHOR("Jan Kotas <jank@cadence.com>");
|
|
MODULE_DESCRIPTION("Cadence UFS host controller platform driver");
|
|
MODULE_LICENSE("GPL v2");
|
|
MODULE_VERSION(UFSHCD_DRIVER_VERSION);
|