1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * UFS Host driver for Synopsys Designware Core 4 * 5 * Copyright (C) 2015-2016 Synopsys, Inc. (www.synopsys.com) 6 * 7 * Authors: Joao Pinto <jpinto@synopsys.com> 8 */ 9 10 #include <linux/module.h> 11 12 #include <ufs/ufshcd.h> 13 #include <ufs/unipro.h> 14 15 #include "ufshcd-dwc.h" 16 #include "ufshci-dwc.h" 17 18 int ufshcd_dwc_dme_set_attrs(struct ufs_hba *hba, 19 const struct ufshcd_dme_attr_val *v, int n) 20 { 21 int ret = 0; 22 int attr_node = 0; 23 24 for (attr_node = 0; attr_node < n; attr_node++) { 25 ret = ufshcd_dme_set_attr(hba, v[attr_node].attr_sel, 26 ATTR_SET_NOR, v[attr_node].mib_val, v[attr_node].peer); 27 28 if (ret) 29 return ret; 30 } 31 32 return 0; 33 } 34 EXPORT_SYMBOL(ufshcd_dwc_dme_set_attrs); 35 36 /** 37 * ufshcd_dwc_program_clk_div() - program clock divider. 38 * @hba: Private Structure pointer 39 * @divider_val: clock divider value to be programmed 40 * 41 */ 42 static void ufshcd_dwc_program_clk_div(struct ufs_hba *hba, u32 divider_val) 43 { 44 ufshcd_writel(hba, divider_val, DWC_UFS_REG_HCLKDIV); 45 } 46 47 /** 48 * ufshcd_dwc_link_is_up() - check if link is up. 49 * @hba: private structure pointer 50 * 51 * Return: 0 on success, non-zero value on failure. 52 */ 53 static int ufshcd_dwc_link_is_up(struct ufs_hba *hba) 54 { 55 int dme_result = 0; 56 57 ufshcd_dme_get(hba, UIC_ARG_MIB(VS_POWERSTATE), &dme_result); 58 59 if (dme_result == UFSHCD_LINK_IS_UP) { 60 ufshcd_set_link_active(hba); 61 return 0; 62 } 63 64 return 1; 65 } 66 67 /** 68 * ufshcd_dwc_connection_setup() - configure unipro attributes. 69 * @hba: pointer to drivers private data 70 * 71 * This function configures both the local side (host) and the peer side 72 * (device) unipro attributes to establish the connection to application/ 73 * cport. 74 * This function is not required if the hardware is properly configured to 75 * have this connection setup on reset. But invoking this function does no 76 * harm and should be fine even working with any ufs device. 77 * 78 * Return: 0 on success non-zero value on failure. 79 */ 80 static int ufshcd_dwc_connection_setup(struct ufs_hba *hba) 81 { 82 static const struct ufshcd_dme_attr_val setup_attrs[] = { 83 { UIC_ARG_MIB(T_CONNECTIONSTATE), 0, DME_LOCAL }, 84 { UIC_ARG_MIB(N_DEVICEID), 0, DME_LOCAL }, 85 { UIC_ARG_MIB(N_DEVICEID_VALID), 0, DME_LOCAL }, 86 { UIC_ARG_MIB(T_PEERDEVICEID), 1, DME_LOCAL }, 87 { UIC_ARG_MIB(T_PEERCPORTID), 0, DME_LOCAL }, 88 { UIC_ARG_MIB(T_TRAFFICCLASS), 0, DME_LOCAL }, 89 { UIC_ARG_MIB(T_CPORTFLAGS), 0x6, DME_LOCAL }, 90 { UIC_ARG_MIB(T_CPORTMODE), 1, DME_LOCAL }, 91 { UIC_ARG_MIB(T_CONNECTIONSTATE), 1, DME_LOCAL }, 92 { UIC_ARG_MIB(T_CONNECTIONSTATE), 0, DME_PEER }, 93 { UIC_ARG_MIB(N_DEVICEID), 1, DME_PEER }, 94 { UIC_ARG_MIB(N_DEVICEID_VALID), 1, DME_PEER }, 95 { UIC_ARG_MIB(T_PEERDEVICEID), 1, DME_PEER }, 96 { UIC_ARG_MIB(T_PEERCPORTID), 0, DME_PEER }, 97 { UIC_ARG_MIB(T_TRAFFICCLASS), 0, DME_PEER }, 98 { UIC_ARG_MIB(T_CPORTFLAGS), 0x6, DME_PEER }, 99 { UIC_ARG_MIB(T_CPORTMODE), 1, DME_PEER }, 100 { UIC_ARG_MIB(T_CONNECTIONSTATE), 1, DME_PEER } 101 }; 102 103 return ufshcd_dwc_dme_set_attrs(hba, setup_attrs, ARRAY_SIZE(setup_attrs)); 104 } 105 106 /** 107 * ufshcd_dwc_link_startup_notify() - program clock divider. 108 * @hba: private structure pointer 109 * @status: Callback notify status 110 * 111 * Return: 0 on success, non-zero value on failure. 112 */ 113 int ufshcd_dwc_link_startup_notify(struct ufs_hba *hba, 114 enum ufs_notify_change_status status) 115 { 116 int err = 0; 117 118 if (status == PRE_CHANGE) { 119 ufshcd_dwc_program_clk_div(hba, DWC_UFS_REG_HCLKDIV_DIV_125); 120 121 err = ufshcd_vops_phy_initialization(hba); 122 if (err) { 123 dev_err(hba->dev, "Phy setup failed (%d)\n", err); 124 goto out; 125 } 126 } else { /* POST_CHANGE */ 127 err = ufshcd_dwc_link_is_up(hba); 128 if (err) { 129 dev_err(hba->dev, "Link is not up\n"); 130 goto out; 131 } 132 133 err = ufshcd_dwc_connection_setup(hba); 134 if (err) 135 dev_err(hba->dev, "Connection setup failed (%d)\n", 136 err); 137 } 138 139 out: 140 return err; 141 } 142 EXPORT_SYMBOL(ufshcd_dwc_link_startup_notify); 143 144 MODULE_AUTHOR("Joao Pinto <Joao.Pinto@synopsys.com>"); 145 MODULE_DESCRIPTION("UFS Host driver for Synopsys Designware Core"); 146 MODULE_LICENSE("Dual BSD/GPL"); 147