1 /* 2 * Copyright 2015 Advanced Micro Devices, Inc. 3 * 4 * Permission is hereby granted, free of charge, to any person obtaining a 5 * copy of this software and associated documentation files (the "Software"), 6 * to deal in the Software without restriction, including without limitation 7 * the rights to use, copy, modify, merge, publish, distribute, sublicense, 8 * and/or sell copies of the Software, and to permit persons to whom the 9 * Software is furnished to do so, subject to the following conditions: 10 * 11 * The above copyright notice and this permission notice shall be included in 12 * all copies or substantial portions of the Software. 13 * 14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 15 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 16 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 17 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR 18 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, 19 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR 20 * OTHER DEALINGS IN THE SOFTWARE. 21 * 22 */ 23 24 #include <linux/pci.h> 25 26 #include "amdgpu.h" 27 #include "amdgpu_ih.h" 28 #include "sid.h" 29 #include "si_ih.h" 30 #include "oss/oss_1_0_d.h" 31 #include "oss/oss_1_0_sh_mask.h" 32 33 static void si_ih_set_interrupt_funcs(struct amdgpu_device *adev); 34 35 static void si_ih_enable_interrupts(struct amdgpu_device *adev) 36 { 37 u32 ih_cntl = RREG32(IH_CNTL); 38 u32 ih_rb_cntl = RREG32(IH_RB_CNTL); 39 40 ih_cntl |= ENABLE_INTR; 41 ih_rb_cntl |= IH_RB_ENABLE; 42 WREG32(IH_CNTL, ih_cntl); 43 WREG32(IH_RB_CNTL, ih_rb_cntl); 44 adev->irq.ih.enabled = true; 45 } 46 47 static void si_ih_disable_interrupts(struct amdgpu_device *adev) 48 { 49 u32 ih_rb_cntl = RREG32(IH_RB_CNTL); 50 u32 ih_cntl = RREG32(IH_CNTL); 51 52 ih_rb_cntl &= ~IH_RB_ENABLE; 53 ih_cntl &= ~ENABLE_INTR; 54 WREG32(IH_RB_CNTL, ih_rb_cntl); 55 WREG32(IH_CNTL, ih_cntl); 56 WREG32(IH_RB_RPTR, 0); 57 WREG32(IH_RB_WPTR, 0); 58 adev->irq.ih.enabled = false; 59 adev->irq.ih.rptr = 0; 60 } 61 62 static int si_ih_irq_init(struct amdgpu_device *adev) 63 { 64 struct amdgpu_ih_ring *ih = &adev->irq.ih; 65 int rb_bufsz; 66 u32 interrupt_cntl, ih_cntl, ih_rb_cntl; 67 68 si_ih_disable_interrupts(adev); 69 /* set dummy read address to dummy page address */ 70 WREG32(INTERRUPT_CNTL2, adev->dummy_page_addr >> 8); 71 interrupt_cntl = RREG32(INTERRUPT_CNTL); 72 interrupt_cntl &= ~IH_DUMMY_RD_OVERRIDE; 73 interrupt_cntl &= ~IH_REQ_NONSNOOP_EN; 74 WREG32(INTERRUPT_CNTL, interrupt_cntl); 75 76 WREG32(IH_RB_BASE, adev->irq.ih.gpu_addr >> 8); 77 rb_bufsz = order_base_2(adev->irq.ih.ring_size / 4); 78 79 ih_rb_cntl = IH_WPTR_OVERFLOW_ENABLE | 80 IH_WPTR_OVERFLOW_CLEAR | 81 (rb_bufsz << 1) | 82 IH_WPTR_WRITEBACK_ENABLE; 83 84 WREG32(IH_RB_WPTR_ADDR_LO, lower_32_bits(ih->wptr_addr)); 85 WREG32(IH_RB_WPTR_ADDR_HI, upper_32_bits(ih->wptr_addr) & 0xFF); 86 WREG32(IH_RB_CNTL, ih_rb_cntl); 87 WREG32(IH_RB_RPTR, 0); 88 WREG32(IH_RB_WPTR, 0); 89 90 ih_cntl = MC_WRREQ_CREDIT(0x10) | MC_WR_CLEAN_CNT(0x10) | MC_VMID(0); 91 if (adev->irq.msi_enabled) 92 ih_cntl |= RPTR_REARM; 93 WREG32(IH_CNTL, ih_cntl); 94 95 pci_set_master(adev->pdev); 96 si_ih_enable_interrupts(adev); 97 98 return 0; 99 } 100 101 static void si_ih_irq_disable(struct amdgpu_device *adev) 102 { 103 si_ih_disable_interrupts(adev); 104 mdelay(1); 105 } 106 107 static u32 si_ih_get_wptr(struct amdgpu_device *adev, 108 struct amdgpu_ih_ring *ih) 109 { 110 u32 wptr, tmp; 111 112 wptr = le32_to_cpu(*ih->wptr_cpu); 113 114 if (wptr & IH_RB_WPTR__RB_OVERFLOW_MASK) { 115 wptr &= ~IH_RB_WPTR__RB_OVERFLOW_MASK; 116 dev_warn(adev->dev, "IH ring buffer overflow (0x%08X, 0x%08X, 0x%08X)\n", 117 wptr, ih->rptr, (wptr + 16) & ih->ptr_mask); 118 ih->rptr = (wptr + 16) & ih->ptr_mask; 119 tmp = RREG32(IH_RB_CNTL); 120 tmp |= IH_RB_CNTL__WPTR_OVERFLOW_CLEAR_MASK; 121 WREG32(IH_RB_CNTL, tmp); 122 } 123 return (wptr & ih->ptr_mask); 124 } 125 126 static void si_ih_decode_iv(struct amdgpu_device *adev, 127 struct amdgpu_ih_ring *ih, 128 struct amdgpu_iv_entry *entry) 129 { 130 u32 ring_index = ih->rptr >> 2; 131 uint32_t dw[4]; 132 133 dw[0] = le32_to_cpu(ih->ring[ring_index + 0]); 134 dw[1] = le32_to_cpu(ih->ring[ring_index + 1]); 135 dw[2] = le32_to_cpu(ih->ring[ring_index + 2]); 136 dw[3] = le32_to_cpu(ih->ring[ring_index + 3]); 137 138 entry->client_id = AMDGPU_IRQ_CLIENTID_LEGACY; 139 entry->src_id = dw[0] & 0xff; 140 entry->src_data[0] = dw[1] & 0xfffffff; 141 entry->ring_id = dw[2] & 0xff; 142 entry->vmid = (dw[2] >> 8) & 0xff; 143 144 ih->rptr += 16; 145 } 146 147 static void si_ih_set_rptr(struct amdgpu_device *adev, 148 struct amdgpu_ih_ring *ih) 149 { 150 WREG32(IH_RB_RPTR, ih->rptr); 151 } 152 153 static int si_ih_early_init(void *handle) 154 { 155 struct amdgpu_device *adev = (struct amdgpu_device *)handle; 156 157 si_ih_set_interrupt_funcs(adev); 158 159 return 0; 160 } 161 162 static int si_ih_sw_init(void *handle) 163 { 164 int r; 165 struct amdgpu_device *adev = (struct amdgpu_device *)handle; 166 167 r = amdgpu_ih_ring_init(adev, &adev->irq.ih, 64 * 1024, false); 168 if (r) 169 return r; 170 171 return amdgpu_irq_init(adev); 172 } 173 174 static int si_ih_sw_fini(void *handle) 175 { 176 struct amdgpu_device *adev = (struct amdgpu_device *)handle; 177 178 amdgpu_irq_fini(adev); 179 amdgpu_ih_ring_fini(adev, &adev->irq.ih); 180 181 return 0; 182 } 183 184 static int si_ih_hw_init(void *handle) 185 { 186 struct amdgpu_device *adev = (struct amdgpu_device *)handle; 187 188 return si_ih_irq_init(adev); 189 } 190 191 static int si_ih_hw_fini(void *handle) 192 { 193 struct amdgpu_device *adev = (struct amdgpu_device *)handle; 194 195 si_ih_irq_disable(adev); 196 197 return 0; 198 } 199 200 static int si_ih_suspend(void *handle) 201 { 202 struct amdgpu_device *adev = (struct amdgpu_device *)handle; 203 204 return si_ih_hw_fini(adev); 205 } 206 207 static int si_ih_resume(void *handle) 208 { 209 struct amdgpu_device *adev = (struct amdgpu_device *)handle; 210 211 return si_ih_hw_init(adev); 212 } 213 214 static bool si_ih_is_idle(void *handle) 215 { 216 struct amdgpu_device *adev = (struct amdgpu_device *)handle; 217 u32 tmp = RREG32(SRBM_STATUS); 218 219 if (tmp & SRBM_STATUS__IH_BUSY_MASK) 220 return false; 221 222 return true; 223 } 224 225 static int si_ih_wait_for_idle(void *handle) 226 { 227 unsigned i; 228 struct amdgpu_device *adev = (struct amdgpu_device *)handle; 229 230 for (i = 0; i < adev->usec_timeout; i++) { 231 if (si_ih_is_idle(handle)) 232 return 0; 233 udelay(1); 234 } 235 return -ETIMEDOUT; 236 } 237 238 static int si_ih_soft_reset(void *handle) 239 { 240 struct amdgpu_device *adev = (struct amdgpu_device *)handle; 241 242 u32 srbm_soft_reset = 0; 243 u32 tmp = RREG32(SRBM_STATUS); 244 245 if (tmp & SRBM_STATUS__IH_BUSY_MASK) 246 srbm_soft_reset |= SRBM_SOFT_RESET__SOFT_RESET_IH_MASK; 247 248 if (srbm_soft_reset) { 249 tmp = RREG32(SRBM_SOFT_RESET); 250 tmp |= srbm_soft_reset; 251 dev_info(adev->dev, "SRBM_SOFT_RESET=0x%08X\n", tmp); 252 WREG32(SRBM_SOFT_RESET, tmp); 253 tmp = RREG32(SRBM_SOFT_RESET); 254 255 udelay(50); 256 257 tmp &= ~srbm_soft_reset; 258 WREG32(SRBM_SOFT_RESET, tmp); 259 tmp = RREG32(SRBM_SOFT_RESET); 260 261 udelay(50); 262 } 263 264 return 0; 265 } 266 267 static int si_ih_set_clockgating_state(void *handle, 268 enum amd_clockgating_state state) 269 { 270 return 0; 271 } 272 273 static int si_ih_set_powergating_state(void *handle, 274 enum amd_powergating_state state) 275 { 276 return 0; 277 } 278 279 static const struct amd_ip_funcs si_ih_ip_funcs = { 280 .name = "si_ih", 281 .early_init = si_ih_early_init, 282 .late_init = NULL, 283 .sw_init = si_ih_sw_init, 284 .sw_fini = si_ih_sw_fini, 285 .hw_init = si_ih_hw_init, 286 .hw_fini = si_ih_hw_fini, 287 .suspend = si_ih_suspend, 288 .resume = si_ih_resume, 289 .is_idle = si_ih_is_idle, 290 .wait_for_idle = si_ih_wait_for_idle, 291 .soft_reset = si_ih_soft_reset, 292 .set_clockgating_state = si_ih_set_clockgating_state, 293 .set_powergating_state = si_ih_set_powergating_state, 294 }; 295 296 static const struct amdgpu_ih_funcs si_ih_funcs = { 297 .get_wptr = si_ih_get_wptr, 298 .decode_iv = si_ih_decode_iv, 299 .set_rptr = si_ih_set_rptr 300 }; 301 302 static void si_ih_set_interrupt_funcs(struct amdgpu_device *adev) 303 { 304 adev->irq.ih_funcs = &si_ih_funcs; 305 } 306 307 const struct amdgpu_ip_block_version si_ih_ip_block = 308 { 309 .type = AMD_IP_BLOCK_TYPE_IH, 310 .major = 1, 311 .minor = 0, 312 .rev = 0, 313 .funcs = &si_ih_ip_funcs, 314 }; 315