1 // SPDX-License-Identifier: MIT
2 /*
3 * Copyright © 2023 Intel Corporation
4 */
5
6 #include "i915_irq.h"
7 #include "i915_reg.h"
8 #include "intel_uncore.h"
9
gen2_irq_reset(struct intel_uncore * uncore,struct i915_irq_regs regs)10 void gen2_irq_reset(struct intel_uncore *uncore, struct i915_irq_regs regs)
11 {
12 intel_uncore_write(uncore, regs.imr, 0xffffffff);
13 intel_uncore_posting_read(uncore, regs.imr);
14
15 intel_uncore_write(uncore, regs.ier, 0);
16
17 /* IIR can theoretically queue up two events. Be paranoid. */
18 intel_uncore_write(uncore, regs.iir, 0xffffffff);
19 intel_uncore_posting_read(uncore, regs.iir);
20 intel_uncore_write(uncore, regs.iir, 0xffffffff);
21 intel_uncore_posting_read(uncore, regs.iir);
22 }
23
24 /*
25 * We should clear IMR at preinstall/uninstall, and just check at postinstall.
26 */
gen2_assert_iir_is_zero(struct intel_uncore * uncore,i915_reg_t reg)27 void gen2_assert_iir_is_zero(struct intel_uncore *uncore, i915_reg_t reg)
28 {
29 struct xe_device *xe = container_of(uncore, struct xe_device, uncore);
30 u32 val = intel_uncore_read(uncore, reg);
31
32 if (val == 0)
33 return;
34
35 drm_WARN(&xe->drm, 1,
36 "Interrupt register 0x%x is not zero: 0x%08x\n",
37 i915_mmio_reg_offset(reg), val);
38 intel_uncore_write(uncore, reg, 0xffffffff);
39 intel_uncore_posting_read(uncore, reg);
40 intel_uncore_write(uncore, reg, 0xffffffff);
41 intel_uncore_posting_read(uncore, reg);
42 }
43
gen2_irq_init(struct intel_uncore * uncore,struct i915_irq_regs regs,u32 imr_val,u32 ier_val)44 void gen2_irq_init(struct intel_uncore *uncore, struct i915_irq_regs regs,
45 u32 imr_val, u32 ier_val)
46 {
47 gen2_assert_iir_is_zero(uncore, regs.iir);
48
49 intel_uncore_write(uncore, regs.ier, ier_val);
50 intel_uncore_write(uncore, regs.imr, imr_val);
51 intel_uncore_posting_read(uncore, regs.imr);
52 }
53
intel_irqs_enabled(struct xe_device * xe)54 bool intel_irqs_enabled(struct xe_device *xe)
55 {
56 return atomic_read(&xe->irq.enabled);
57 }
58
intel_synchronize_irq(struct xe_device * xe)59 void intel_synchronize_irq(struct xe_device *xe)
60 {
61 synchronize_irq(to_pci_dev(xe->drm.dev)->irq);
62 }
63