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// SPDX-License-Identifier: GPL-2.0-only
/*
* UFS Host driver for Synopsys Designware Core
*
* Copyright (C) 2015-2016 Synopsys, Inc. (www.synopsys.com)
*
* Authors: Joao Pinto <jpinto@synopsys.com>
*/
#include <linux/module.h>
#include <ufs/ufshcd.h>
#include <ufs/unipro.h>
#include "ufshcd-dwc.h"
#include "ufshci-dwc.h"
int ufshcd_dwc_dme_set_attrs(struct ufs_hba *hba,
const struct ufshcd_dme_attr_val *v, int n)
{
int ret = 0;
int attr_node = 0;
for (attr_node = 0; attr_node < n; attr_node++) {
ret = ufshcd_dme_set_attr(hba, v[attr_node].attr_sel,
ATTR_SET_NOR, v[attr_node].mib_val, v[attr_node].peer);
if (ret)
return ret;
}
return 0;
}
EXPORT_SYMBOL(ufshcd_dwc_dme_set_attrs);
/**
* ufshcd_dwc_program_clk_div()
* This function programs the clk divider value. This value is needed to
* provide 1 microsecond tick to unipro layer.
* @hba: Private Structure pointer
* @divider_val: clock divider value to be programmed
*
*/
static void ufshcd_dwc_program_clk_div(struct ufs_hba *hba, u32 divider_val)
{
ufshcd_writel(hba, divider_val, DWC_UFS_REG_HCLKDIV);
}
/**
* ufshcd_dwc_link_is_up()
* Check if link is up
* @hba: private structure pointer
*
* Returns 0 on success, non-zero value on failure
*/
static int ufshcd_dwc_link_is_up(struct ufs_hba *hba)
{
int dme_result = 0;
ufshcd_dme_get(hba, UIC_ARG_MIB(VS_POWERSTATE), &dme_result);
if (dme_result == UFSHCD_LINK_IS_UP) {
ufshcd_set_link_active(hba);
return 0;
}
return 1;
}
/**
* ufshcd_dwc_connection_setup()
* This function configures both the local side (host) and the peer side
* (device) unipro attributes to establish the connection to application/
* cport.
* This function is not required if the hardware is properly configured to
* have this connection setup on reset. But invoking this function does no
* harm and should be fine even working with any ufs device.
*
* @hba: pointer to drivers private data
*
* Returns 0 on success non-zero value on failure
*/
static int ufshcd_dwc_connection_setup(struct ufs_hba *hba)
{
static const struct ufshcd_dme_attr_val setup_attrs[] = {
{ UIC_ARG_MIB(T_CONNECTIONSTATE), 0, DME_LOCAL },
{ UIC_ARG_MIB(N_DEVICEID), 0, DME_LOCAL },
{ UIC_ARG_MIB(N_DEVICEID_VALID), 0, DME_LOCAL },
{ UIC_ARG_MIB(T_PEERDEVICEID), 1, DME_LOCAL },
{ UIC_ARG_MIB(T_PEERCPORTID), 0, DME_LOCAL },
{ UIC_ARG_MIB(T_TRAFFICCLASS), 0, DME_LOCAL },
{ UIC_ARG_MIB(T_CPORTFLAGS), 0x6, DME_LOCAL },
{ UIC_ARG_MIB(T_CPORTMODE), 1, DME_LOCAL },
{ UIC_ARG_MIB(T_CONNECTIONSTATE), 1, DME_LOCAL },
{ UIC_ARG_MIB(T_CONNECTIONSTATE), 0, DME_PEER },
{ UIC_ARG_MIB(N_DEVICEID), 1, DME_PEER },
{ UIC_ARG_MIB(N_DEVICEID_VALID), 1, DME_PEER },
{ UIC_ARG_MIB(T_PEERDEVICEID), 1, DME_PEER },
{ UIC_ARG_MIB(T_PEERCPORTID), 0, DME_PEER },
{ UIC_ARG_MIB(T_TRAFFICCLASS), 0, DME_PEER },
{ UIC_ARG_MIB(T_CPORTFLAGS), 0x6, DME_PEER },
{ UIC_ARG_MIB(T_CPORTMODE), 1, DME_PEER },
{ UIC_ARG_MIB(T_CONNECTIONSTATE), 1, DME_PEER }
};
return ufshcd_dwc_dme_set_attrs(hba, setup_attrs, ARRAY_SIZE(setup_attrs));
}
/**
* ufshcd_dwc_link_startup_notify()
* UFS Host DWC specific link startup sequence
* @hba: private structure pointer
* @status: Callback notify status
*
* Returns 0 on success, non-zero value on failure
*/
int ufshcd_dwc_link_startup_notify(struct ufs_hba *hba,
enum ufs_notify_change_status status)
{
int err = 0;
if (status == PRE_CHANGE) {
ufshcd_dwc_program_clk_div(hba, DWC_UFS_REG_HCLKDIV_DIV_125);
err = ufshcd_vops_phy_initialization(hba);
if (err) {
dev_err(hba->dev, "Phy setup failed (%d)\n", err);
goto out;
}
} else { /* POST_CHANGE */
err = ufshcd_dwc_link_is_up(hba);
if (err) {
dev_err(hba->dev, "Link is not up\n");
goto out;
}
err = ufshcd_dwc_connection_setup(hba);
if (err)
dev_err(hba->dev, "Connection setup failed (%d)\n",
err);
}
out:
return err;
}
EXPORT_SYMBOL(ufshcd_dwc_link_startup_notify);
MODULE_AUTHOR("Joao Pinto <Joao.Pinto@synopsys.com>");
MODULE_DESCRIPTION("UFS Host driver for Synopsys Designware Core");
MODULE_LICENSE("Dual BSD/GPL");
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