diff options
Diffstat (limited to 'drivers/gpu/drm/i915/intel_sideband.c')
-rw-r--r-- | drivers/gpu/drm/i915/intel_sideband.c | 257 |
1 files changed, 0 insertions, 257 deletions
diff --git a/drivers/gpu/drm/i915/intel_sideband.c b/drivers/gpu/drm/i915/intel_sideband.c index e304bf44e1ff..59ef67216c15 100644 --- a/drivers/gpu/drm/i915/intel_sideband.c +++ b/drivers/gpu/drm/i915/intel_sideband.c @@ -27,263 +27,6 @@ #include "i915_drv.h" #include "intel_sideband.h" -/* - * IOSF sideband, see VLV2_SidebandMsg_HAS.docx and - * VLV_VLV2_PUNIT_HAS_0.8.docx - */ - -/* Standard MMIO read, non-posted */ -#define SB_MRD_NP 0x00 -/* Standard MMIO write, non-posted */ -#define SB_MWR_NP 0x01 -/* Private register read, double-word addressing, non-posted */ -#define SB_CRRDDA_NP 0x06 -/* Private register write, double-word addressing, non-posted */ -#define SB_CRWRDA_NP 0x07 - -static void ping(void *info) -{ -} - -static void __vlv_punit_get(struct drm_i915_private *i915) -{ - iosf_mbi_punit_acquire(); - - /* - * Prevent the cpu from sleeping while we use this sideband, otherwise - * the punit may cause a machine hang. The issue appears to be isolated - * with changing the power state of the CPU package while changing - * the power state via the punit, and we have only observed it - * reliably on 4-core Baytail systems suggesting the issue is in the - * power delivery mechanism and likely to be be board/function - * specific. Hence we presume the workaround needs only be applied - * to the Valleyview P-unit and not all sideband communications. - */ - if (IS_VALLEYVIEW(i915)) { - cpu_latency_qos_update_request(&i915->sb_qos, 0); - on_each_cpu(ping, NULL, 1); - } -} - -static void __vlv_punit_put(struct drm_i915_private *i915) -{ - if (IS_VALLEYVIEW(i915)) - cpu_latency_qos_update_request(&i915->sb_qos, - PM_QOS_DEFAULT_VALUE); - - iosf_mbi_punit_release(); -} - -void vlv_iosf_sb_get(struct drm_i915_private *i915, unsigned long ports) -{ - if (ports & BIT(VLV_IOSF_SB_PUNIT)) - __vlv_punit_get(i915); - - mutex_lock(&i915->sb_lock); -} - -void vlv_iosf_sb_put(struct drm_i915_private *i915, unsigned long ports) -{ - mutex_unlock(&i915->sb_lock); - - if (ports & BIT(VLV_IOSF_SB_PUNIT)) - __vlv_punit_put(i915); -} - -static int vlv_sideband_rw(struct drm_i915_private *i915, - u32 devfn, u32 port, u32 opcode, - u32 addr, u32 *val) -{ - struct intel_uncore *uncore = &i915->uncore; - const bool is_read = (opcode == SB_MRD_NP || opcode == SB_CRRDDA_NP); - int err; - - lockdep_assert_held(&i915->sb_lock); - if (port == IOSF_PORT_PUNIT) - iosf_mbi_assert_punit_acquired(); - - /* Flush the previous comms, just in case it failed last time. */ - if (intel_wait_for_register(uncore, - VLV_IOSF_DOORBELL_REQ, IOSF_SB_BUSY, 0, - 5)) { - drm_dbg(&i915->drm, "IOSF sideband idle wait (%s) timed out\n", - is_read ? "read" : "write"); - return -EAGAIN; - } - - preempt_disable(); - - intel_uncore_write_fw(uncore, VLV_IOSF_ADDR, addr); - intel_uncore_write_fw(uncore, VLV_IOSF_DATA, is_read ? 0 : *val); - intel_uncore_write_fw(uncore, VLV_IOSF_DOORBELL_REQ, - (devfn << IOSF_DEVFN_SHIFT) | - (opcode << IOSF_OPCODE_SHIFT) | - (port << IOSF_PORT_SHIFT) | - (0xf << IOSF_BYTE_ENABLES_SHIFT) | - (0 << IOSF_BAR_SHIFT) | - IOSF_SB_BUSY); - - if (__intel_wait_for_register_fw(uncore, - VLV_IOSF_DOORBELL_REQ, IOSF_SB_BUSY, 0, - 10000, 0, NULL) == 0) { - if (is_read) - *val = intel_uncore_read_fw(uncore, VLV_IOSF_DATA); - err = 0; - } else { - drm_dbg(&i915->drm, "IOSF sideband finish wait (%s) timed out\n", - is_read ? "read" : "write"); - err = -ETIMEDOUT; - } - - preempt_enable(); - - return err; -} - -u32 vlv_punit_read(struct drm_i915_private *i915, u32 addr) -{ - u32 val = 0; - - vlv_sideband_rw(i915, PCI_DEVFN(0, 0), IOSF_PORT_PUNIT, - SB_CRRDDA_NP, addr, &val); - - return val; -} - -int vlv_punit_write(struct drm_i915_private *i915, u32 addr, u32 val) -{ - return vlv_sideband_rw(i915, PCI_DEVFN(0, 0), IOSF_PORT_PUNIT, - SB_CRWRDA_NP, addr, &val); -} - -u32 vlv_bunit_read(struct drm_i915_private *i915, u32 reg) -{ - u32 val = 0; - - vlv_sideband_rw(i915, PCI_DEVFN(0, 0), IOSF_PORT_BUNIT, - SB_CRRDDA_NP, reg, &val); - - return val; -} - -void vlv_bunit_write(struct drm_i915_private *i915, u32 reg, u32 val) -{ - vlv_sideband_rw(i915, PCI_DEVFN(0, 0), IOSF_PORT_BUNIT, - SB_CRWRDA_NP, reg, &val); -} - -u32 vlv_nc_read(struct drm_i915_private *i915, u8 addr) -{ - u32 val = 0; - - vlv_sideband_rw(i915, PCI_DEVFN(0, 0), IOSF_PORT_NC, - SB_CRRDDA_NP, addr, &val); - - return val; -} - -u32 vlv_iosf_sb_read(struct drm_i915_private *i915, u8 port, u32 reg) -{ - u32 val = 0; - - vlv_sideband_rw(i915, PCI_DEVFN(0, 0), port, - SB_CRRDDA_NP, reg, &val); - - return val; -} - -void vlv_iosf_sb_write(struct drm_i915_private *i915, - u8 port, u32 reg, u32 val) -{ - vlv_sideband_rw(i915, PCI_DEVFN(0, 0), port, - SB_CRWRDA_NP, reg, &val); -} - -u32 vlv_cck_read(struct drm_i915_private *i915, u32 reg) -{ - u32 val = 0; - - vlv_sideband_rw(i915, PCI_DEVFN(0, 0), IOSF_PORT_CCK, - SB_CRRDDA_NP, reg, &val); - - return val; -} - -void vlv_cck_write(struct drm_i915_private *i915, u32 reg, u32 val) -{ - vlv_sideband_rw(i915, PCI_DEVFN(0, 0), IOSF_PORT_CCK, - SB_CRWRDA_NP, reg, &val); -} - -u32 vlv_ccu_read(struct drm_i915_private *i915, u32 reg) -{ - u32 val = 0; - - vlv_sideband_rw(i915, PCI_DEVFN(0, 0), IOSF_PORT_CCU, - SB_CRRDDA_NP, reg, &val); - - return val; -} - -void vlv_ccu_write(struct drm_i915_private *i915, u32 reg, u32 val) -{ - vlv_sideband_rw(i915, PCI_DEVFN(0, 0), IOSF_PORT_CCU, - SB_CRWRDA_NP, reg, &val); -} - -static u32 vlv_dpio_phy_iosf_port(struct drm_i915_private *i915, enum dpio_phy phy) -{ - /* - * IOSF_PORT_DPIO: VLV x2 PHY (DP/HDMI B and C), CHV x1 PHY (DP/HDMI D) - * IOSF_PORT_DPIO_2: CHV x2 PHY (DP/HDMI B and C) - */ - if (IS_CHERRYVIEW(i915)) - return phy == DPIO_PHY0 ? IOSF_PORT_DPIO_2 : IOSF_PORT_DPIO; - else - return IOSF_PORT_DPIO; -} - -u32 vlv_dpio_read(struct drm_i915_private *i915, enum pipe pipe, int reg) -{ - u32 port = vlv_dpio_phy_iosf_port(i915, DPIO_PHY(pipe)); - u32 val = 0; - - vlv_sideband_rw(i915, DPIO_DEVFN, port, SB_MRD_NP, reg, &val); - - /* - * FIXME: There might be some registers where all 1's is a valid value, - * so ideally we should check the register offset instead... - */ - drm_WARN(&i915->drm, val == 0xffffffff, - "DPIO read pipe %c reg 0x%x == 0x%x\n", - pipe_name(pipe), reg, val); - - return val; -} - -void vlv_dpio_write(struct drm_i915_private *i915, - enum pipe pipe, int reg, u32 val) -{ - u32 port = vlv_dpio_phy_iosf_port(i915, DPIO_PHY(pipe)); - - vlv_sideband_rw(i915, DPIO_DEVFN, port, SB_MWR_NP, reg, &val); -} - -u32 vlv_flisdsi_read(struct drm_i915_private *i915, u32 reg) -{ - u32 val = 0; - - vlv_sideband_rw(i915, DPIO_DEVFN, IOSF_PORT_FLISDSI, SB_CRRDDA_NP, - reg, &val); - return val; -} - -void vlv_flisdsi_write(struct drm_i915_private *i915, u32 reg, u32 val) -{ - vlv_sideband_rw(i915, DPIO_DEVFN, IOSF_PORT_FLISDSI, SB_CRWRDA_NP, - reg, &val); -} - /* SBI access */ static int intel_sbi_rw(struct drm_i915_private *i915, u16 reg, enum intel_sbi_destination destination, |