| /* |
| * Copyright 2014 Advanced Micro Devices, Inc. |
| * |
| * Permission is hereby granted, free of charge, to any person obtaining a |
| * copy of this software and associated documentation files (the "Software"), |
| * to deal in the Software without restriction, including without limitation |
| * the rights to use, copy, modify, merge, publish, distribute, sublicense, |
| * and/or sell copies of the Software, and to permit persons to whom the |
| * Software is furnished to do so, subject to the following conditions: |
| * |
| * The above copyright notice and this permission notice shall be included in |
| * all copies or substantial portions of the Software. |
| * |
| * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
| * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
| * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL |
| * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR |
| * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, |
| * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR |
| * OTHER DEALINGS IN THE SOFTWARE. |
| * |
| */ |
| |
| #include <linux/pci.h> |
| |
| #include "amdgpu.h" |
| #include "amdgpu_ih.h" |
| #include "vid.h" |
| |
| #include "oss/oss_2_4_d.h" |
| #include "oss/oss_2_4_sh_mask.h" |
| |
| #include "bif/bif_5_1_d.h" |
| #include "bif/bif_5_1_sh_mask.h" |
| |
| /* |
| * Interrupts |
| * Starting with r6xx, interrupts are handled via a ring buffer. |
| * Ring buffers are areas of GPU accessible memory that the GPU |
| * writes interrupt vectors into and the host reads vectors out of. |
| * There is a rptr (read pointer) that determines where the |
| * host is currently reading, and a wptr (write pointer) |
| * which determines where the GPU has written. When the |
| * pointers are equal, the ring is idle. When the GPU |
| * writes vectors to the ring buffer, it increments the |
| * wptr. When there is an interrupt, the host then starts |
| * fetching commands and processing them until the pointers are |
| * equal again at which point it updates the rptr. |
| */ |
| |
| static void iceland_ih_set_interrupt_funcs(struct amdgpu_device *adev); |
| |
| /** |
| * iceland_ih_enable_interrupts - Enable the interrupt ring buffer |
| * |
| * @adev: amdgpu_device pointer |
| * |
| * Enable the interrupt ring buffer (VI). |
| */ |
| static void iceland_ih_enable_interrupts(struct amdgpu_device *adev) |
| { |
| u32 ih_cntl = RREG32(mmIH_CNTL); |
| u32 ih_rb_cntl = RREG32(mmIH_RB_CNTL); |
| |
| ih_cntl = REG_SET_FIELD(ih_cntl, IH_CNTL, ENABLE_INTR, 1); |
| ih_rb_cntl = REG_SET_FIELD(ih_rb_cntl, IH_RB_CNTL, RB_ENABLE, 1); |
| WREG32(mmIH_CNTL, ih_cntl); |
| WREG32(mmIH_RB_CNTL, ih_rb_cntl); |
| adev->irq.ih.enabled = true; |
| } |
| |
| /** |
| * iceland_ih_disable_interrupts - Disable the interrupt ring buffer |
| * |
| * @adev: amdgpu_device pointer |
| * |
| * Disable the interrupt ring buffer (VI). |
| */ |
| static void iceland_ih_disable_interrupts(struct amdgpu_device *adev) |
| { |
| u32 ih_rb_cntl = RREG32(mmIH_RB_CNTL); |
| u32 ih_cntl = RREG32(mmIH_CNTL); |
| |
| ih_rb_cntl = REG_SET_FIELD(ih_rb_cntl, IH_RB_CNTL, RB_ENABLE, 0); |
| ih_cntl = REG_SET_FIELD(ih_cntl, IH_CNTL, ENABLE_INTR, 0); |
| WREG32(mmIH_RB_CNTL, ih_rb_cntl); |
| WREG32(mmIH_CNTL, ih_cntl); |
| /* set rptr, wptr to 0 */ |
| WREG32(mmIH_RB_RPTR, 0); |
| WREG32(mmIH_RB_WPTR, 0); |
| adev->irq.ih.enabled = false; |
| adev->irq.ih.rptr = 0; |
| } |
| |
| /** |
| * iceland_ih_irq_init - init and enable the interrupt ring |
| * |
| * @adev: amdgpu_device pointer |
| * |
| * Allocate a ring buffer for the interrupt controller, |
| * enable the RLC, disable interrupts, enable the IH |
| * ring buffer and enable it (VI). |
| * Called at device load and reume. |
| * Returns 0 for success, errors for failure. |
| */ |
| static int iceland_ih_irq_init(struct amdgpu_device *adev) |
| { |
| struct amdgpu_ih_ring *ih = &adev->irq.ih; |
| int rb_bufsz; |
| u32 interrupt_cntl, ih_cntl, ih_rb_cntl; |
| |
| /* disable irqs */ |
| iceland_ih_disable_interrupts(adev); |
| |
| /* setup interrupt control */ |
| WREG32(mmINTERRUPT_CNTL2, adev->dummy_page_addr >> 8); |
| interrupt_cntl = RREG32(mmINTERRUPT_CNTL); |
| /* INTERRUPT_CNTL__IH_DUMMY_RD_OVERRIDE_MASK=0 - dummy read disabled with msi, enabled without msi |
| * INTERRUPT_CNTL__IH_DUMMY_RD_OVERRIDE_MASK=1 - dummy read controlled by IH_DUMMY_RD_EN |
| */ |
| interrupt_cntl = REG_SET_FIELD(interrupt_cntl, INTERRUPT_CNTL, IH_DUMMY_RD_OVERRIDE, 0); |
| /* INTERRUPT_CNTL__IH_REQ_NONSNOOP_EN_MASK=1 if ring is in non-cacheable memory, e.g., vram */ |
| interrupt_cntl = REG_SET_FIELD(interrupt_cntl, INTERRUPT_CNTL, IH_REQ_NONSNOOP_EN, 0); |
| WREG32(mmINTERRUPT_CNTL, interrupt_cntl); |
| |
| /* Ring Buffer base. [39:8] of 40-bit address of the beginning of the ring buffer*/ |
| WREG32(mmIH_RB_BASE, adev->irq.ih.gpu_addr >> 8); |
| |
| rb_bufsz = order_base_2(adev->irq.ih.ring_size / 4); |
| ih_rb_cntl = REG_SET_FIELD(0, IH_RB_CNTL, WPTR_OVERFLOW_ENABLE, 1); |
| ih_rb_cntl = REG_SET_FIELD(ih_rb_cntl, IH_RB_CNTL, WPTR_OVERFLOW_CLEAR, 1); |
| ih_rb_cntl = REG_SET_FIELD(ih_rb_cntl, IH_RB_CNTL, RB_SIZE, rb_bufsz); |
| |
| /* Ring Buffer write pointer writeback. If enabled, IH_RB_WPTR register value is written to memory */ |
| ih_rb_cntl = REG_SET_FIELD(ih_rb_cntl, IH_RB_CNTL, WPTR_WRITEBACK_ENABLE, 1); |
| |
| /* set the writeback address whether it's enabled or not */ |
| WREG32(mmIH_RB_WPTR_ADDR_LO, lower_32_bits(ih->wptr_addr)); |
| WREG32(mmIH_RB_WPTR_ADDR_HI, upper_32_bits(ih->wptr_addr) & 0xFF); |
| |
| WREG32(mmIH_RB_CNTL, ih_rb_cntl); |
| |
| /* set rptr, wptr to 0 */ |
| WREG32(mmIH_RB_RPTR, 0); |
| WREG32(mmIH_RB_WPTR, 0); |
| |
| /* Default settings for IH_CNTL (disabled at first) */ |
| ih_cntl = RREG32(mmIH_CNTL); |
| ih_cntl = REG_SET_FIELD(ih_cntl, IH_CNTL, MC_VMID, 0); |
| |
| if (adev->irq.msi_enabled) |
| ih_cntl = REG_SET_FIELD(ih_cntl, IH_CNTL, RPTR_REARM, 1); |
| WREG32(mmIH_CNTL, ih_cntl); |
| |
| pci_set_master(adev->pdev); |
| |
| /* enable interrupts */ |
| iceland_ih_enable_interrupts(adev); |
| |
| return 0; |
| } |
| |
| /** |
| * iceland_ih_irq_disable - disable interrupts |
| * |
| * @adev: amdgpu_device pointer |
| * |
| * Disable interrupts on the hw (VI). |
| */ |
| static void iceland_ih_irq_disable(struct amdgpu_device *adev) |
| { |
| iceland_ih_disable_interrupts(adev); |
| |
| /* Wait and acknowledge irq */ |
| mdelay(1); |
| } |
| |
| /** |
| * iceland_ih_get_wptr - get the IH ring buffer wptr |
| * |
| * @adev: amdgpu_device pointer |
| * @ih: IH ring buffer to fetch wptr |
| * |
| * Get the IH ring buffer wptr from either the register |
| * or the writeback memory buffer (VI). Also check for |
| * ring buffer overflow and deal with it. |
| * Used by cz_irq_process(VI). |
| * Returns the value of the wptr. |
| */ |
| static u32 iceland_ih_get_wptr(struct amdgpu_device *adev, |
| struct amdgpu_ih_ring *ih) |
| { |
| u32 wptr, tmp; |
| |
| wptr = le32_to_cpu(*ih->wptr_cpu); |
| |
| if (!REG_GET_FIELD(wptr, IH_RB_WPTR, RB_OVERFLOW)) |
| goto out; |
| |
| /* Double check that the overflow wasn't already cleared. */ |
| wptr = RREG32(mmIH_RB_WPTR); |
| |
| if (!REG_GET_FIELD(wptr, IH_RB_WPTR, RB_OVERFLOW)) |
| goto out; |
| |
| wptr = REG_SET_FIELD(wptr, IH_RB_WPTR, RB_OVERFLOW, 0); |
| /* When a ring buffer overflow happen start parsing interrupt |
| * from the last not overwritten vector (wptr + 16). Hopefully |
| * this should allow us to catchup. |
| */ |
| dev_warn(adev->dev, "IH ring buffer overflow (0x%08X, 0x%08X, 0x%08X)\n", |
| wptr, ih->rptr, (wptr + 16) & ih->ptr_mask); |
| ih->rptr = (wptr + 16) & ih->ptr_mask; |
| tmp = RREG32(mmIH_RB_CNTL); |
| tmp = REG_SET_FIELD(tmp, IH_RB_CNTL, WPTR_OVERFLOW_CLEAR, 1); |
| WREG32(mmIH_RB_CNTL, tmp); |
| |
| /* Unset the CLEAR_OVERFLOW bit immediately so new overflows |
| * can be detected. |
| */ |
| tmp = REG_SET_FIELD(tmp, IH_RB_CNTL, WPTR_OVERFLOW_CLEAR, 0); |
| WREG32(mmIH_RB_CNTL, tmp); |
| |
| out: |
| return (wptr & ih->ptr_mask); |
| } |
| |
| /** |
| * iceland_ih_decode_iv - decode an interrupt vector |
| * |
| * @adev: amdgpu_device pointer |
| * @ih: IH ring buffer to decode |
| * @entry: IV entry to place decoded information into |
| * |
| * Decodes the interrupt vector at the current rptr |
| * position and also advance the position. |
| */ |
| static void iceland_ih_decode_iv(struct amdgpu_device *adev, |
| struct amdgpu_ih_ring *ih, |
| struct amdgpu_iv_entry *entry) |
| { |
| /* wptr/rptr are in bytes! */ |
| u32 ring_index = ih->rptr >> 2; |
| uint32_t dw[4]; |
| |
| dw[0] = le32_to_cpu(ih->ring[ring_index + 0]); |
| dw[1] = le32_to_cpu(ih->ring[ring_index + 1]); |
| dw[2] = le32_to_cpu(ih->ring[ring_index + 2]); |
| dw[3] = le32_to_cpu(ih->ring[ring_index + 3]); |
| |
| entry->client_id = AMDGPU_IRQ_CLIENTID_LEGACY; |
| entry->src_id = dw[0] & 0xff; |
| entry->src_data[0] = dw[1] & 0xfffffff; |
| entry->ring_id = dw[2] & 0xff; |
| entry->vmid = (dw[2] >> 8) & 0xff; |
| entry->pasid = (dw[2] >> 16) & 0xffff; |
| |
| /* wptr/rptr are in bytes! */ |
| ih->rptr += 16; |
| } |
| |
| /** |
| * iceland_ih_set_rptr - set the IH ring buffer rptr |
| * |
| * @adev: amdgpu_device pointer |
| * @ih: IH ring buffer to set rptr |
| * |
| * Set the IH ring buffer rptr. |
| */ |
| static void iceland_ih_set_rptr(struct amdgpu_device *adev, |
| struct amdgpu_ih_ring *ih) |
| { |
| WREG32(mmIH_RB_RPTR, ih->rptr); |
| } |
| |
| static int iceland_ih_early_init(void *handle) |
| { |
| struct amdgpu_device *adev = (struct amdgpu_device *)handle; |
| int ret; |
| |
| ret = amdgpu_irq_add_domain(adev); |
| if (ret) |
| return ret; |
| |
| iceland_ih_set_interrupt_funcs(adev); |
| |
| return 0; |
| } |
| |
| static int iceland_ih_sw_init(void *handle) |
| { |
| int r; |
| struct amdgpu_device *adev = (struct amdgpu_device *)handle; |
| |
| r = amdgpu_ih_ring_init(adev, &adev->irq.ih, 64 * 1024, false); |
| if (r) |
| return r; |
| |
| r = amdgpu_irq_init(adev); |
| |
| return r; |
| } |
| |
| static int iceland_ih_sw_fini(void *handle) |
| { |
| struct amdgpu_device *adev = (struct amdgpu_device *)handle; |
| |
| amdgpu_irq_fini_sw(adev); |
| amdgpu_irq_remove_domain(adev); |
| |
| return 0; |
| } |
| |
| static int iceland_ih_hw_init(void *handle) |
| { |
| struct amdgpu_device *adev = (struct amdgpu_device *)handle; |
| |
| return iceland_ih_irq_init(adev); |
| } |
| |
| static int iceland_ih_hw_fini(void *handle) |
| { |
| struct amdgpu_device *adev = (struct amdgpu_device *)handle; |
| |
| iceland_ih_irq_disable(adev); |
| |
| return 0; |
| } |
| |
| static int iceland_ih_suspend(void *handle) |
| { |
| struct amdgpu_device *adev = (struct amdgpu_device *)handle; |
| |
| return iceland_ih_hw_fini(adev); |
| } |
| |
| static int iceland_ih_resume(void *handle) |
| { |
| struct amdgpu_device *adev = (struct amdgpu_device *)handle; |
| |
| return iceland_ih_hw_init(adev); |
| } |
| |
| static bool iceland_ih_is_idle(void *handle) |
| { |
| struct amdgpu_device *adev = (struct amdgpu_device *)handle; |
| u32 tmp = RREG32(mmSRBM_STATUS); |
| |
| if (REG_GET_FIELD(tmp, SRBM_STATUS, IH_BUSY)) |
| return false; |
| |
| return true; |
| } |
| |
| static int iceland_ih_wait_for_idle(void *handle) |
| { |
| unsigned i; |
| u32 tmp; |
| struct amdgpu_device *adev = (struct amdgpu_device *)handle; |
| |
| for (i = 0; i < adev->usec_timeout; i++) { |
| /* read MC_STATUS */ |
| tmp = RREG32(mmSRBM_STATUS); |
| if (!REG_GET_FIELD(tmp, SRBM_STATUS, IH_BUSY)) |
| return 0; |
| udelay(1); |
| } |
| return -ETIMEDOUT; |
| } |
| |
| static int iceland_ih_soft_reset(void *handle) |
| { |
| u32 srbm_soft_reset = 0; |
| struct amdgpu_device *adev = (struct amdgpu_device *)handle; |
| u32 tmp = RREG32(mmSRBM_STATUS); |
| |
| if (tmp & SRBM_STATUS__IH_BUSY_MASK) |
| srbm_soft_reset = REG_SET_FIELD(srbm_soft_reset, SRBM_SOFT_RESET, |
| SOFT_RESET_IH, 1); |
| |
| if (srbm_soft_reset) { |
| tmp = RREG32(mmSRBM_SOFT_RESET); |
| tmp |= srbm_soft_reset; |
| dev_info(adev->dev, "SRBM_SOFT_RESET=0x%08X\n", tmp); |
| WREG32(mmSRBM_SOFT_RESET, tmp); |
| tmp = RREG32(mmSRBM_SOFT_RESET); |
| |
| udelay(50); |
| |
| tmp &= ~srbm_soft_reset; |
| WREG32(mmSRBM_SOFT_RESET, tmp); |
| tmp = RREG32(mmSRBM_SOFT_RESET); |
| |
| /* Wait a little for things to settle down */ |
| udelay(50); |
| } |
| |
| return 0; |
| } |
| |
| static int iceland_ih_set_clockgating_state(void *handle, |
| enum amd_clockgating_state state) |
| { |
| return 0; |
| } |
| |
| static int iceland_ih_set_powergating_state(void *handle, |
| enum amd_powergating_state state) |
| { |
| return 0; |
| } |
| |
| static const struct amd_ip_funcs iceland_ih_ip_funcs = { |
| .name = "iceland_ih", |
| .early_init = iceland_ih_early_init, |
| .late_init = NULL, |
| .sw_init = iceland_ih_sw_init, |
| .sw_fini = iceland_ih_sw_fini, |
| .hw_init = iceland_ih_hw_init, |
| .hw_fini = iceland_ih_hw_fini, |
| .suspend = iceland_ih_suspend, |
| .resume = iceland_ih_resume, |
| .is_idle = iceland_ih_is_idle, |
| .wait_for_idle = iceland_ih_wait_for_idle, |
| .soft_reset = iceland_ih_soft_reset, |
| .set_clockgating_state = iceland_ih_set_clockgating_state, |
| .set_powergating_state = iceland_ih_set_powergating_state, |
| }; |
| |
| static const struct amdgpu_ih_funcs iceland_ih_funcs = { |
| .get_wptr = iceland_ih_get_wptr, |
| .decode_iv = iceland_ih_decode_iv, |
| .set_rptr = iceland_ih_set_rptr |
| }; |
| |
| static void iceland_ih_set_interrupt_funcs(struct amdgpu_device *adev) |
| { |
| adev->irq.ih_funcs = &iceland_ih_funcs; |
| } |
| |
| const struct amdgpu_ip_block_version iceland_ih_ip_block = |
| { |
| .type = AMD_IP_BLOCK_TYPE_IH, |
| .major = 2, |
| .minor = 4, |
| .rev = 0, |
| .funcs = &iceland_ih_ip_funcs, |
| }; |