1 /* 2 * Huawei HiNIC PCI Express Linux driver 3 * Copyright(c) 2017 Huawei Technologies Co., Ltd 4 * 5 * This program is free software; you can redistribute it and/or modify it 6 * under the terms and conditions of the GNU General Public License, 7 * version 2, as published by the Free Software Foundation. 8 * 9 * This program is distributed in the hope it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * for more details. 13 * 14 */ 15 16 #include <linux/pci.h> 17 #include <linux/device.h> 18 #include <linux/errno.h> 19 #include <linux/io.h> 20 #include <linux/types.h> 21 #include <linux/bitops.h> 22 23 #include "hinic_hw_csr.h" 24 #include "hinic_hw_if.h" 25 26 #define PCIE_ATTR_ENTRY 0 27 28 #define VALID_MSIX_IDX(attr, msix_index) ((msix_index) < (attr)->num_irqs) 29 30 /** 31 * hinic_msix_attr_set - set message attribute for msix entry 32 * @hwif: the HW interface of a pci function device 33 * @msix_index: msix_index 34 * @pending_limit: the maximum pending interrupt events (unit 8) 35 * @coalesc_timer: coalesc period for interrupt (unit 8 us) 36 * @lli_timer: replenishing period for low latency credit (unit 8 us) 37 * @lli_credit_limit: maximum credits for low latency msix messages (unit 8) 38 * @resend_timer: maximum wait for resending msix (unit coalesc period) 39 * 40 * Return 0 - Success, negative - Failure 41 **/ 42 int hinic_msix_attr_set(struct hinic_hwif *hwif, u16 msix_index, 43 u8 pending_limit, u8 coalesc_timer, 44 u8 lli_timer, u8 lli_credit_limit, 45 u8 resend_timer) 46 { 47 u32 msix_ctrl, addr; 48 49 if (!VALID_MSIX_IDX(&hwif->attr, msix_index)) 50 return -EINVAL; 51 52 msix_ctrl = HINIC_MSIX_ATTR_SET(pending_limit, PENDING_LIMIT) | 53 HINIC_MSIX_ATTR_SET(coalesc_timer, COALESC_TIMER) | 54 HINIC_MSIX_ATTR_SET(lli_timer, LLI_TIMER) | 55 HINIC_MSIX_ATTR_SET(lli_credit_limit, LLI_CREDIT) | 56 HINIC_MSIX_ATTR_SET(resend_timer, RESEND_TIMER); 57 58 addr = HINIC_CSR_MSIX_CTRL_ADDR(msix_index); 59 60 hinic_hwif_write_reg(hwif, addr, msix_ctrl); 61 return 0; 62 } 63 64 /** 65 * hinic_msix_attr_get - get message attribute of msix entry 66 * @hwif: the HW interface of a pci function device 67 * @msix_index: msix_index 68 * @pending_limit: the maximum pending interrupt events (unit 8) 69 * @coalesc_timer: coalesc period for interrupt (unit 8 us) 70 * @lli_timer: replenishing period for low latency credit (unit 8 us) 71 * @lli_credit_limit: maximum credits for low latency msix messages (unit 8) 72 * @resend_timer: maximum wait for resending msix (unit coalesc period) 73 * 74 * Return 0 - Success, negative - Failure 75 **/ 76 int hinic_msix_attr_get(struct hinic_hwif *hwif, u16 msix_index, 77 u8 *pending_limit, u8 *coalesc_timer, 78 u8 *lli_timer, u8 *lli_credit_limit, 79 u8 *resend_timer) 80 { 81 u32 addr, val; 82 83 if (!VALID_MSIX_IDX(&hwif->attr, msix_index)) 84 return -EINVAL; 85 86 addr = HINIC_CSR_MSIX_CTRL_ADDR(msix_index); 87 val = hinic_hwif_read_reg(hwif, addr); 88 89 *pending_limit = HINIC_MSIX_ATTR_GET(val, PENDING_LIMIT); 90 *coalesc_timer = HINIC_MSIX_ATTR_GET(val, COALESC_TIMER); 91 *lli_timer = HINIC_MSIX_ATTR_GET(val, LLI_TIMER); 92 *lli_credit_limit = HINIC_MSIX_ATTR_GET(val, LLI_CREDIT); 93 *resend_timer = HINIC_MSIX_ATTR_GET(val, RESEND_TIMER); 94 return 0; 95 } 96 97 /** 98 * hinic_msix_attr_cnt_clear - clear message attribute counters for msix entry 99 * @hwif: the HW interface of a pci function device 100 * @msix_index: msix_index 101 * 102 * Return 0 - Success, negative - Failure 103 **/ 104 int hinic_msix_attr_cnt_clear(struct hinic_hwif *hwif, u16 msix_index) 105 { 106 u32 msix_ctrl, addr; 107 108 if (!VALID_MSIX_IDX(&hwif->attr, msix_index)) 109 return -EINVAL; 110 111 msix_ctrl = HINIC_MSIX_CNT_SET(1, RESEND_TIMER); 112 addr = HINIC_CSR_MSIX_CNT_ADDR(msix_index); 113 114 hinic_hwif_write_reg(hwif, addr, msix_ctrl); 115 return 0; 116 } 117 118 /** 119 * hinic_set_pf_action - set action on pf channel 120 * @hwif: the HW interface of a pci function device 121 * @action: action on pf channel 122 * 123 * Return 0 - Success, negative - Failure 124 **/ 125 void hinic_set_pf_action(struct hinic_hwif *hwif, enum hinic_pf_action action) 126 { 127 u32 attr5 = hinic_hwif_read_reg(hwif, HINIC_CSR_FUNC_ATTR5_ADDR); 128 129 attr5 = HINIC_FA5_CLEAR(attr5, PF_ACTION); 130 attr5 |= HINIC_FA5_SET(action, PF_ACTION); 131 132 hinic_hwif_write_reg(hwif, HINIC_CSR_FUNC_ATTR5_ADDR, attr5); 133 } 134 135 enum hinic_outbound_state hinic_outbound_state_get(struct hinic_hwif *hwif) 136 { 137 u32 attr4 = hinic_hwif_read_reg(hwif, HINIC_CSR_FUNC_ATTR4_ADDR); 138 139 return HINIC_FA4_GET(attr4, OUTBOUND_STATE); 140 } 141 142 void hinic_outbound_state_set(struct hinic_hwif *hwif, 143 enum hinic_outbound_state outbound_state) 144 { 145 u32 attr4 = hinic_hwif_read_reg(hwif, HINIC_CSR_FUNC_ATTR4_ADDR); 146 147 attr4 = HINIC_FA4_CLEAR(attr4, OUTBOUND_STATE); 148 attr4 |= HINIC_FA4_SET(outbound_state, OUTBOUND_STATE); 149 150 hinic_hwif_write_reg(hwif, HINIC_CSR_FUNC_ATTR4_ADDR, attr4); 151 } 152 153 enum hinic_db_state hinic_db_state_get(struct hinic_hwif *hwif) 154 { 155 u32 attr4 = hinic_hwif_read_reg(hwif, HINIC_CSR_FUNC_ATTR4_ADDR); 156 157 return HINIC_FA4_GET(attr4, DB_STATE); 158 } 159 160 void hinic_db_state_set(struct hinic_hwif *hwif, 161 enum hinic_db_state db_state) 162 { 163 u32 attr4 = hinic_hwif_read_reg(hwif, HINIC_CSR_FUNC_ATTR4_ADDR); 164 165 attr4 = HINIC_FA4_CLEAR(attr4, DB_STATE); 166 attr4 |= HINIC_FA4_SET(db_state, DB_STATE); 167 168 hinic_hwif_write_reg(hwif, HINIC_CSR_FUNC_ATTR4_ADDR, attr4); 169 } 170 171 /** 172 * hwif_ready - test if the HW is ready for use 173 * @hwif: the HW interface of a pci function device 174 * 175 * Return 0 - Success, negative - Failure 176 **/ 177 static int hwif_ready(struct hinic_hwif *hwif) 178 { 179 struct pci_dev *pdev = hwif->pdev; 180 u32 addr, attr1; 181 182 addr = HINIC_CSR_FUNC_ATTR1_ADDR; 183 attr1 = hinic_hwif_read_reg(hwif, addr); 184 185 if (!HINIC_FA1_GET(attr1, INIT_STATUS)) { 186 dev_err(&pdev->dev, "hwif status is not ready\n"); 187 return -EFAULT; 188 } 189 190 return 0; 191 } 192 193 /** 194 * set_hwif_attr - set the attributes in the relevant members in hwif 195 * @hwif: the HW interface of a pci function device 196 * @attr0: the first attribute that was read from the hw 197 * @attr1: the second attribute that was read from the hw 198 **/ 199 static void set_hwif_attr(struct hinic_hwif *hwif, u32 attr0, u32 attr1) 200 { 201 hwif->attr.func_idx = HINIC_FA0_GET(attr0, FUNC_IDX); 202 hwif->attr.pf_idx = HINIC_FA0_GET(attr0, PF_IDX); 203 hwif->attr.pci_intf_idx = HINIC_FA0_GET(attr0, PCI_INTF_IDX); 204 hwif->attr.func_type = HINIC_FA0_GET(attr0, FUNC_TYPE); 205 206 hwif->attr.num_aeqs = BIT(HINIC_FA1_GET(attr1, AEQS_PER_FUNC)); 207 hwif->attr.num_ceqs = BIT(HINIC_FA1_GET(attr1, CEQS_PER_FUNC)); 208 hwif->attr.num_irqs = BIT(HINIC_FA1_GET(attr1, IRQS_PER_FUNC)); 209 hwif->attr.num_dma_attr = BIT(HINIC_FA1_GET(attr1, DMA_ATTR_PER_FUNC)); 210 } 211 212 /** 213 * read_hwif_attr - read the attributes and set members in hwif 214 * @hwif: the HW interface of a pci function device 215 **/ 216 static void read_hwif_attr(struct hinic_hwif *hwif) 217 { 218 u32 addr, attr0, attr1; 219 220 addr = HINIC_CSR_FUNC_ATTR0_ADDR; 221 attr0 = hinic_hwif_read_reg(hwif, addr); 222 223 addr = HINIC_CSR_FUNC_ATTR1_ADDR; 224 attr1 = hinic_hwif_read_reg(hwif, addr); 225 226 set_hwif_attr(hwif, attr0, attr1); 227 } 228 229 /** 230 * set_ppf - try to set hwif as ppf and set the type of hwif in this case 231 * @hwif: the HW interface of a pci function device 232 **/ 233 static void set_ppf(struct hinic_hwif *hwif) 234 { 235 struct hinic_func_attr *attr = &hwif->attr; 236 u32 addr, val, ppf_election; 237 238 /* Read Modify Write */ 239 addr = HINIC_CSR_PPF_ELECTION_ADDR(HINIC_HWIF_PCI_INTF(hwif)); 240 241 val = hinic_hwif_read_reg(hwif, addr); 242 val = HINIC_PPF_ELECTION_CLEAR(val, IDX); 243 244 ppf_election = HINIC_PPF_ELECTION_SET(HINIC_HWIF_FUNC_IDX(hwif), IDX); 245 246 val |= ppf_election; 247 hinic_hwif_write_reg(hwif, addr, val); 248 249 /* check PPF */ 250 val = hinic_hwif_read_reg(hwif, addr); 251 252 attr->ppf_idx = HINIC_PPF_ELECTION_GET(val, IDX); 253 if (attr->ppf_idx == HINIC_HWIF_FUNC_IDX(hwif)) 254 attr->func_type = HINIC_PPF; 255 } 256 257 /** 258 * set_dma_attr - set the dma attributes in the HW 259 * @hwif: the HW interface of a pci function device 260 * @entry_idx: the entry index in the dma table 261 * @st: PCIE TLP steering tag 262 * @at: PCIE TLP AT field 263 * @ph: PCIE TLP Processing Hint field 264 * @no_snooping: PCIE TLP No snooping 265 * @tph_en: PCIE TLP Processing Hint Enable 266 **/ 267 static void set_dma_attr(struct hinic_hwif *hwif, u32 entry_idx, 268 u8 st, u8 at, u8 ph, 269 enum hinic_pcie_nosnoop no_snooping, 270 enum hinic_pcie_tph tph_en) 271 { 272 u32 addr, val, dma_attr_entry; 273 274 /* Read Modify Write */ 275 addr = HINIC_CSR_DMA_ATTR_ADDR(entry_idx); 276 277 val = hinic_hwif_read_reg(hwif, addr); 278 val = HINIC_DMA_ATTR_CLEAR(val, ST) & 279 HINIC_DMA_ATTR_CLEAR(val, AT) & 280 HINIC_DMA_ATTR_CLEAR(val, PH) & 281 HINIC_DMA_ATTR_CLEAR(val, NO_SNOOPING) & 282 HINIC_DMA_ATTR_CLEAR(val, TPH_EN); 283 284 dma_attr_entry = HINIC_DMA_ATTR_SET(st, ST) | 285 HINIC_DMA_ATTR_SET(at, AT) | 286 HINIC_DMA_ATTR_SET(ph, PH) | 287 HINIC_DMA_ATTR_SET(no_snooping, NO_SNOOPING) | 288 HINIC_DMA_ATTR_SET(tph_en, TPH_EN); 289 290 val |= dma_attr_entry; 291 hinic_hwif_write_reg(hwif, addr, val); 292 } 293 294 /** 295 * dma_attr_table_init - initialize the the default dma attributes 296 * @hwif: the HW interface of a pci function device 297 **/ 298 static void dma_attr_init(struct hinic_hwif *hwif) 299 { 300 set_dma_attr(hwif, PCIE_ATTR_ENTRY, HINIC_PCIE_ST_DISABLE, 301 HINIC_PCIE_AT_DISABLE, HINIC_PCIE_PH_DISABLE, 302 HINIC_PCIE_SNOOP, HINIC_PCIE_TPH_DISABLE); 303 } 304 305 /** 306 * hinic_init_hwif - initialize the hw interface 307 * @hwif: the HW interface of a pci function device 308 * @pdev: the pci device for acessing PCI resources 309 * 310 * Return 0 - Success, negative - Failure 311 **/ 312 int hinic_init_hwif(struct hinic_hwif *hwif, struct pci_dev *pdev) 313 { 314 int err; 315 316 hwif->pdev = pdev; 317 318 hwif->cfg_regs_bar = pci_ioremap_bar(pdev, HINIC_PCI_CFG_REGS_BAR); 319 if (!hwif->cfg_regs_bar) { 320 dev_err(&pdev->dev, "Failed to map configuration regs\n"); 321 return -ENOMEM; 322 } 323 324 err = hwif_ready(hwif); 325 if (err) { 326 dev_err(&pdev->dev, "HW interface is not ready\n"); 327 goto err_hwif_ready; 328 } 329 330 read_hwif_attr(hwif); 331 332 if (HINIC_IS_PF(hwif)) 333 set_ppf(hwif); 334 335 /* No transactionss before DMA is initialized */ 336 dma_attr_init(hwif); 337 return 0; 338 339 err_hwif_ready: 340 iounmap(hwif->cfg_regs_bar); 341 return err; 342 } 343 344 /** 345 * hinic_free_hwif - free the HW interface 346 * @hwif: the HW interface of a pci function device 347 **/ 348 void hinic_free_hwif(struct hinic_hwif *hwif) 349 { 350 iounmap(hwif->cfg_regs_bar); 351 } 352