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// 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/clk.h>
#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
#define CDNS_UFS_REG_PHY_XCFGD1 0x113C
#define CDNS_UFS_MAX_L4_ATTRS 12
struct cdns_ufs_host {
/**
* cdns_ufs_dme_attr_val - for storing L4 attributes
*/
u32 cdns_ufs_dme_attr_val[CDNS_UFS_MAX_L4_ATTRS];
};
/**
* cdns_ufs_get_l4_attr - get L4 attributes on local side
* @hba: per adapter instance
*
*/
static void cdns_ufs_get_l4_attr(struct ufs_hba *hba)
{
struct cdns_ufs_host *host = ufshcd_get_variant(hba);
ufshcd_dme_get(hba, UIC_ARG_MIB(T_PEERDEVICEID),
&host->cdns_ufs_dme_attr_val[0]);
ufshcd_dme_get(hba, UIC_ARG_MIB(T_PEERCPORTID),
&host->cdns_ufs_dme_attr_val[1]);
ufshcd_dme_get(hba, UIC_ARG_MIB(T_TRAFFICCLASS),
&host->cdns_ufs_dme_attr_val[2]);
ufshcd_dme_get(hba, UIC_ARG_MIB(T_PROTOCOLID),
&host->cdns_ufs_dme_attr_val[3]);
ufshcd_dme_get(hba, UIC_ARG_MIB(T_CPORTFLAGS),
&host->cdns_ufs_dme_attr_val[4]);
ufshcd_dme_get(hba, UIC_ARG_MIB(T_TXTOKENVALUE),
&host->cdns_ufs_dme_attr_val[5]);
ufshcd_dme_get(hba, UIC_ARG_MIB(T_RXTOKENVALUE),
&host->cdns_ufs_dme_attr_val[6]);
ufshcd_dme_get(hba, UIC_ARG_MIB(T_LOCALBUFFERSPACE),
&host->cdns_ufs_dme_attr_val[7]);
ufshcd_dme_get(hba, UIC_ARG_MIB(T_PEERBUFFERSPACE),
&host->cdns_ufs_dme_attr_val[8]);
ufshcd_dme_get(hba, UIC_ARG_MIB(T_CREDITSTOSEND),
&host->cdns_ufs_dme_attr_val[9]);
ufshcd_dme_get(hba, UIC_ARG_MIB(T_CPORTMODE),
&host->cdns_ufs_dme_attr_val[10]);
ufshcd_dme_get(hba, UIC_ARG_MIB(T_CONNECTIONSTATE),
&host->cdns_ufs_dme_attr_val[11]);
}
/**
* cdns_ufs_set_l4_attr - set L4 attributes on local side
* @hba: per adapter instance
*
*/
static void cdns_ufs_set_l4_attr(struct ufs_hba *hba)
{
struct cdns_ufs_host *host = ufshcd_get_variant(hba);
ufshcd_dme_set(hba, UIC_ARG_MIB(T_CONNECTIONSTATE), 0);
ufshcd_dme_set(hba, UIC_ARG_MIB(T_PEERDEVICEID),
host->cdns_ufs_dme_attr_val[0]);
ufshcd_dme_set(hba, UIC_ARG_MIB(T_PEERCPORTID),
host->cdns_ufs_dme_attr_val[1]);
ufshcd_dme_set(hba, UIC_ARG_MIB(T_TRAFFICCLASS),
host->cdns_ufs_dme_attr_val[2]);
ufshcd_dme_set(hba, UIC_ARG_MIB(T_PROTOCOLID),
host->cdns_ufs_dme_attr_val[3]);
ufshcd_dme_set(hba, UIC_ARG_MIB(T_CPORTFLAGS),
host->cdns_ufs_dme_attr_val[4]);
ufshcd_dme_set(hba, UIC_ARG_MIB(T_TXTOKENVALUE),
host->cdns_ufs_dme_attr_val[5]);
ufshcd_dme_set(hba, UIC_ARG_MIB(T_RXTOKENVALUE),
host->cdns_ufs_dme_attr_val[6]);
ufshcd_dme_set(hba, UIC_ARG_MIB(T_LOCALBUFFERSPACE),
host->cdns_ufs_dme_attr_val[7]);
ufshcd_dme_set(hba, UIC_ARG_MIB(T_PEERBUFFERSPACE),
host->cdns_ufs_dme_attr_val[8]);
ufshcd_dme_set(hba, UIC_ARG_MIB(T_CREDITSTOSEND),
host->cdns_ufs_dme_attr_val[9]);
ufshcd_dme_set(hba, UIC_ARG_MIB(T_CPORTMODE),
host->cdns_ufs_dme_attr_val[10]);
ufshcd_dme_set(hba, UIC_ARG_MIB(T_CONNECTIONSTATE),
host->cdns_ufs_dme_attr_val[11]);
}
/**
* cdns_ufs_set_hclkdiv() - set 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;
}
/**
* cdns_ufs_hce_enable_notify() - set HCLKDIV register
* @hba: host controller instance
* @status: notify stage (pre, post change)
*
* Return: zero for success and non-zero for failure.
*/
static int cdns_ufs_hce_enable_notify(struct ufs_hba *hba,
enum ufs_notify_change_status status)
{
if (status != PRE_CHANGE)
return 0;
return cdns_ufs_set_hclkdiv(hba);
}
/**
* cdns_ufs_hibern8_notify() - save and restore L4 attributes.
* @hba: host controller instance
* @cmd: UIC Command
* @status: notify stage (pre, post change)
*/
static void cdns_ufs_hibern8_notify(struct ufs_hba *hba, enum uic_cmd_dme cmd,
enum ufs_notify_change_status status)
{
if (status == PRE_CHANGE && cmd == UIC_CMD_DME_HIBER_ENTER)
cdns_ufs_get_l4_attr(hba);
if (status == POST_CHANGE && cmd == UIC_CMD_DME_HIBER_EXIT)
cdns_ufs_set_l4_attr(hba);
}
/**
* cdns_ufs_link_startup_notify() - handle link startup.
* @hba: host controller instance
* @status: notify stage (pre, post change)
*
* Return: zero for success and non-zero for failure.
*/
static int cdns_ufs_link_startup_notify(struct ufs_hba *hba,
enum ufs_notify_change_status status)
{
if (status != PRE_CHANGE)
return 0;
/*
* Some UFS devices have issues if LCC is enabled.
* So we are setting PA_Local_TX_LCC_Enable to 0
* before link startup which will make sure that both host
* and device TX LCC are disabled once link startup is
* completed.
*/
ufshcd_disable_host_tx_lcc(hba);
/*
* Disabling Autohibern8 feature in cadence UFS
* to mask unexpected interrupt trigger.
*/
hba->ahit = 0;
return 0;
}
/**
* cdns_ufs_init - performs additional ufs initialization
* @hba: host controller instance
*
* Return: status of initialization.
*/
static int cdns_ufs_init(struct ufs_hba *hba)
{
int status = 0;
struct cdns_ufs_host *host;
struct device *dev = hba->dev;
host = devm_kzalloc(dev, sizeof(*host), GFP_KERNEL);
if (!host)
return -ENOMEM;
ufshcd_set_variant(hba, host);
status = ufshcd_vops_phy_initialization(hba);
return status;
}
/**
* cdns_ufs_m31_16nm_phy_initialization - performs m31 phy initialization
* @hba: host controller instance
*
* Return: 0 (success).
*/
static int cdns_ufs_m31_16nm_phy_initialization(struct ufs_hba *hba)
{
u32 data;
/* Increase RX_Advanced_Min_ActivateTime_Capability */
data = ufshcd_readl(hba, CDNS_UFS_REG_PHY_XCFGD1);
data |= BIT(24);
ufshcd_writel(hba, data, CDNS_UFS_REG_PHY_XCFGD1);
return 0;
}
static const struct ufs_hba_variant_ops cdns_ufs_pltfm_hba_vops = {
.name = "cdns-ufs-pltfm",
.init = cdns_ufs_init,
.hce_enable_notify = cdns_ufs_hce_enable_notify,
.link_startup_notify = cdns_ufs_link_startup_notify,
.hibern8_notify = cdns_ufs_hibern8_notify,
};
static const struct ufs_hba_variant_ops cdns_ufs_m31_16nm_pltfm_hba_vops = {
.name = "cdns-ufs-pltfm",
.init = cdns_ufs_init,
.hce_enable_notify = cdns_ufs_hce_enable_notify,
.link_startup_notify = cdns_ufs_link_startup_notify,
.phy_initialization = cdns_ufs_m31_16nm_phy_initialization,
.hibern8_notify = cdns_ufs_hibern8_notify,
};
static const struct of_device_id cdns_ufs_of_match[] = {
{
.compatible = "cdns,ufshc",
.data = &cdns_ufs_pltfm_hba_vops,
},
{
.compatible = "cdns,ufshc-m31-16nm",
.data = &cdns_ufs_m31_16nm_pltfm_hba_vops,
},
{ },
};
MODULE_DEVICE_TABLE(of, cdns_ufs_of_match);
/**
* 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;
const struct of_device_id *of_id;
struct ufs_hba_variant_ops *vops;
struct device *dev = &pdev->dev;
of_id = of_match_node(cdns_ufs_of_match, dev->of_node);
vops = (struct ufs_hba_variant_ops *)of_id->data;
/* Perform generic probe */
err = ufshcd_pltfrm_init(pdev, 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
*
* Return: 0 (success).
*/
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 dev_pm_ops cdns_ufs_dev_pm_ops = {
SET_SYSTEM_SLEEP_PM_OPS(ufshcd_system_suspend, ufshcd_system_resume)
SET_RUNTIME_PM_OPS(ufshcd_runtime_suspend, ufshcd_runtime_resume, NULL)
.prepare = ufshcd_suspend_prepare,
.complete = ufshcd_resume_complete,
};
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");
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