// 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 ( ) - program clock divider .
* @ 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
*
* Return : 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 ( ) - configure unipro attributes .
* @ hba : pointer to drivers private data
*
* 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 .
*
* Return : 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), 0 x6, 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), 0 x6, 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 ( ) - program clock divider .
* @ hba : private structure pointer
* @ status : Callback notify status
*
* Return : 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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