drm/radeon/kms: add support for gen2 pcie link speeds

Supported on rv6xx/r7xx/evergreen.  Cards come up in gen1 mode.

Signed-off-by: Alex Deucher <alexdeucher@gmail.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>

7 files changed, 348 insertions, 0 deletions

diff --git a/drivers/gpu/drm/radeon/evergreen.c b/drivers/gpu/drm/radeon/evergreen.c
index eaf4fba90b7..11344c76e21 100644
--- a/drivers/gpu/drm/radeon/evergreen.c
+++ b/drivers/gpu/drm/radeon/evergreen.c
@@ -39,6 +39,7 @@
 
 static void evergreen_gpu_init(struct radeon_device *rdev);
 void evergreen_fini(struct radeon_device *rdev);
+static void evergreen_pcie_gen2_enable(struct radeon_device *rdev);
 
 void evergreen_pre_page_flip(struct radeon_device *rdev, int crtc)
 {
@@ -2767,6 +2768,9 @@ static int evergreen_startup(struct radeon_device *rdev)
 {
         int r;
 
+        /* enable pcie gen2 link */
+        evergreen_pcie_gen2_enable(rdev);
+
         if (!rdev->me_fw || !rdev->pfp_fw || !rdev->rlc_fw) {
                 r = r600_init_microcode(rdev);
                 if (r) {
@@ -3049,3 +3053,52 @@ void evergreen_fini(struct radeon_device *rdev)
         rdev->bios = NULL;
         radeon_dummy_page_fini(rdev);
 }
+
+static void evergreen_pcie_gen2_enable(struct radeon_device *rdev)
+{
+        u32 link_width_cntl, speed_cntl;
+
+        if (rdev->flags & RADEON_IS_IGP)
+                return;
+
+        if (!(rdev->flags & RADEON_IS_PCIE))
+                return;
+
+        /* x2 cards have a special sequence */
+        if (ASIC_IS_X2(rdev))
+                return;
+
+        speed_cntl = RREG32_PCIE_P(PCIE_LC_SPEED_CNTL);
+        if ((speed_cntl & LC_OTHER_SIDE_EVER_SENT_GEN2) ||
+            (speed_cntl & LC_OTHER_SIDE_SUPPORTS_GEN2)) {
+
+                link_width_cntl = RREG32_PCIE_P(PCIE_LC_LINK_WIDTH_CNTL);
+                link_width_cntl &= ~LC_UPCONFIGURE_DIS;
+                WREG32_PCIE_P(PCIE_LC_LINK_WIDTH_CNTL, link_width_cntl);
+
+                speed_cntl = RREG32_PCIE_P(PCIE_LC_SPEED_CNTL);
+                speed_cntl &= ~LC_TARGET_LINK_SPEED_OVERRIDE_EN;
+                WREG32_PCIE_P(PCIE_LC_SPEED_CNTL, speed_cntl);
+
+                speed_cntl = RREG32_PCIE_P(PCIE_LC_SPEED_CNTL);
+                speed_cntl |= LC_CLR_FAILED_SPD_CHANGE_CNT;
+                WREG32_PCIE_P(PCIE_LC_SPEED_CNTL, speed_cntl);
+
+                speed_cntl = RREG32_PCIE_P(PCIE_LC_SPEED_CNTL);
+                speed_cntl &= ~LC_CLR_FAILED_SPD_CHANGE_CNT;
+                WREG32_PCIE_P(PCIE_LC_SPEED_CNTL, speed_cntl);
+
+                speed_cntl = RREG32_PCIE_P(PCIE_LC_SPEED_CNTL);
+                speed_cntl |= LC_GEN2_EN_STRAP;
+                WREG32_PCIE_P(PCIE_LC_SPEED_CNTL, speed_cntl);
+
+        } else {
+                link_width_cntl = RREG32_PCIE_P(PCIE_LC_LINK_WIDTH_CNTL);
+                /* XXX: only disable it if gen1 bridge vendor == 0x111d or 0x1106 */
+                if (1)
+                        link_width_cntl |= LC_UPCONFIGURE_DIS;
+                else
+                        link_width_cntl &= ~LC_UPCONFIGURE_DIS;
+                WREG32_PCIE_P(PCIE_LC_LINK_WIDTH_CNTL, link_width_cntl);
+        }
+}
diff --git a/drivers/gpu/drm/radeon/evergreend.h b/drivers/gpu/drm/radeon/evergreend.h
index 94140e142ab..b8da323f15c 100644
--- a/drivers/gpu/drm/radeon/evergreend.h
+++ b/drivers/gpu/drm/radeon/evergreend.h
@@ -581,6 +581,44 @@
 #       define DC_HPDx_RX_INT_TIMER(x)                    ((x) << 16)
 #       define DC_HPDx_EN                                 (1 << 28)
 
+/* PCIE link stuff */
+#define PCIE_LC_TRAINING_CNTL                             0xa1 /* PCIE_P */
+#define PCIE_LC_LINK_WIDTH_CNTL                           0xa2 /* PCIE_P */
+#       define LC_LINK_WIDTH_SHIFT                        0
+#       define LC_LINK_WIDTH_MASK                         0x7
+#       define LC_LINK_WIDTH_X0                           0
+#       define LC_LINK_WIDTH_X1                           1
+#       define LC_LINK_WIDTH_X2                           2
+#       define LC_LINK_WIDTH_X4                           3
+#       define LC_LINK_WIDTH_X8                           4
+#       define LC_LINK_WIDTH_X16                          6
+#       define LC_LINK_WIDTH_RD_SHIFT                     4
+#       define LC_LINK_WIDTH_RD_MASK                      0x70
+#       define LC_RECONFIG_ARC_MISSING_ESCAPE             (1 << 7)
+#       define LC_RECONFIG_NOW                            (1 << 8)
+#       define LC_RENEGOTIATION_SUPPORT                   (1 << 9)
+#       define LC_RENEGOTIATE_EN                          (1 << 10)
+#       define LC_SHORT_RECONFIG_EN                       (1 << 11)
+#       define LC_UPCONFIGURE_SUPPORT                     (1 << 12)
+#       define LC_UPCONFIGURE_DIS                         (1 << 13)
+#define PCIE_LC_SPEED_CNTL                                0xa4 /* PCIE_P */
+#       define LC_GEN2_EN_STRAP                           (1 << 0)
+#       define LC_TARGET_LINK_SPEED_OVERRIDE_EN           (1 << 1)
+#       define LC_FORCE_EN_HW_SPEED_CHANGE                (1 << 5)
+#       define LC_FORCE_DIS_HW_SPEED_CHANGE               (1 << 6)
+#       define LC_SPEED_CHANGE_ATTEMPTS_ALLOWED_MASK      (0x3 << 8)
+#       define LC_SPEED_CHANGE_ATTEMPTS_ALLOWED_SHIFT     3
+#       define LC_CURRENT_DATA_RATE                       (1 << 11)
+#       define LC_VOLTAGE_TIMER_SEL_MASK                  (0xf << 14)
+#       define LC_CLR_FAILED_SPD_CHANGE_CNT               (1 << 21)
+#       define LC_OTHER_SIDE_EVER_SENT_GEN2               (1 << 23)
+#       define LC_OTHER_SIDE_SUPPORTS_GEN2                (1 << 24)
+#define MM_CFGREGS_CNTL                                   0x544c
+#       define MM_WR_TO_CFG_EN                            (1 << 3)
+#define LINK_CNTL2                                        0x88 /* F0 */
+#       define TARGET_LINK_SPEED_MASK                     (0xf << 0)
+#       define SELECTABLE_DEEMPHASIS                      (1 << 6)
+
 /*
  * PM4
  */
diff --git a/drivers/gpu/drm/radeon/r600.c b/drivers/gpu/drm/radeon/r600.c
index 60ad8c03081..6b50716267c 100644
--- a/drivers/gpu/drm/radeon/r600.c
+++ b/drivers/gpu/drm/radeon/r600.c
@@ -94,6 +94,7 @@ int r600_mc_wait_for_idle(struct radeon_device *rdev);
 void r600_gpu_init(struct radeon_device *rdev);
 void r600_fini(struct radeon_device *rdev);
 void r600_irq_disable(struct radeon_device *rdev);
+static void r600_pcie_gen2_enable(struct radeon_device *rdev);
 
 /* get temperature in millidegrees */
 u32 rv6xx_get_temp(struct radeon_device *rdev)
@@ -2379,6 +2380,9 @@ int r600_startup(struct radeon_device *rdev)
 {
         int r;
 
+        /* enable pcie gen2 link */
+        r600_pcie_gen2_enable(rdev);
+
         if (!rdev->me_fw || !rdev->pfp_fw || !rdev->rlc_fw) {
                 r = r600_init_microcode(rdev);
                 if (r) {
@@ -3649,3 +3653,101 @@ int r600_get_pcie_lanes(struct radeon_device *rdev)
         }
 }
 
+static void r600_pcie_gen2_enable(struct radeon_device *rdev)
+{
+        u32 link_width_cntl, lanes, speed_cntl, training_cntl, tmp;
+        u16 link_cntl2;
+
+        if (rdev->flags & RADEON_IS_IGP)
+                return;
+
+        if (!(rdev->flags & RADEON_IS_PCIE))
+                return;
+
+        /* x2 cards have a special sequence */
+        if (ASIC_IS_X2(rdev))
+                return;
+
+        /* only RV6xx+ chips are supported */
+        if (rdev->family <= CHIP_R600)
+                return;
+
+        /* 55 nm r6xx asics */
+        if ((rdev->family == CHIP_RV670) ||
+            (rdev->family == CHIP_RV620) ||
+            (rdev->family == CHIP_RV635)) {
+                /* advertise upconfig capability */
+                link_width_cntl = RREG32_PCIE_P(PCIE_LC_LINK_WIDTH_CNTL);
+                link_width_cntl &= ~LC_UPCONFIGURE_DIS;
+                WREG32_PCIE_P(PCIE_LC_LINK_WIDTH_CNTL, link_width_cntl);
+                link_width_cntl = RREG32_PCIE_P(PCIE_LC_LINK_WIDTH_CNTL);
+                if (link_width_cntl & LC_RENEGOTIATION_SUPPORT) {
+                        lanes = (link_width_cntl & LC_LINK_WIDTH_RD_MASK) >> LC_LINK_WIDTH_RD_SHIFT;
+                        link_width_cntl &= ~(LC_LINK_WIDTH_MASK |
+                                             LC_RECONFIG_ARC_MISSING_ESCAPE);
+                        link_width_cntl |= lanes | LC_RECONFIG_NOW | LC_RENEGOTIATE_EN;
+                        WREG32_PCIE_P(PCIE_LC_LINK_WIDTH_CNTL, link_width_cntl);
+                } else {
+                        link_width_cntl |= LC_UPCONFIGURE_DIS;
+                        WREG32_PCIE_P(PCIE_LC_LINK_WIDTH_CNTL, link_width_cntl);
+                }
+        }
+
+        speed_cntl = RREG32_PCIE_P(PCIE_LC_SPEED_CNTL);
+        if ((speed_cntl & LC_OTHER_SIDE_EVER_SENT_GEN2) &&
+            (speed_cntl & LC_OTHER_SIDE_SUPPORTS_GEN2)) {
+
+                /* 55 nm r6xx asics */
+                if ((rdev->family == CHIP_RV670) ||
+                    (rdev->family == CHIP_RV620) ||
+                    (rdev->family == CHIP_RV635)) {
+                        WREG32(MM_CFGREGS_CNTL, 0x8);
+                        link_cntl2 = RREG32(0x4088);
+                        WREG32(MM_CFGREGS_CNTL, 0);
+                        /* not supported yet */
+                        if (link_cntl2 & SELECTABLE_DEEMPHASIS)
+                                return;
+                }
+
+                speed_cntl &= ~LC_SPEED_CHANGE_ATTEMPTS_ALLOWED_MASK;
+                speed_cntl |= (0x3 << LC_SPEED_CHANGE_ATTEMPTS_ALLOWED_SHIFT);
+                speed_cntl &= ~LC_VOLTAGE_TIMER_SEL_MASK;
+                speed_cntl &= ~LC_FORCE_DIS_HW_SPEED_CHANGE;
+                speed_cntl |= LC_FORCE_EN_HW_SPEED_CHANGE;
+                WREG32_PCIE_P(PCIE_LC_SPEED_CNTL, speed_cntl);
+
+                tmp = RREG32(0x541c);
+                WREG32(0x541c, tmp | 0x8);
+                WREG32(MM_CFGREGS_CNTL, MM_WR_TO_CFG_EN);
+                link_cntl2 = RREG16(0x4088);
+                link_cntl2 &= ~TARGET_LINK_SPEED_MASK;
+                link_cntl2 |= 0x2;
+                WREG16(0x4088, link_cntl2);
+                WREG32(MM_CFGREGS_CNTL, 0);
+
+                if ((rdev->family == CHIP_RV670) ||
+                    (rdev->family == CHIP_RV620) ||
+                    (rdev->family == CHIP_RV635)) {
+                        training_cntl = RREG32_PCIE_P(PCIE_LC_TRAINING_CNTL);
+                        training_cntl &= ~LC_POINT_7_PLUS_EN;
+                        WREG32_PCIE_P(PCIE_LC_TRAINING_CNTL, training_cntl);
+                } else {
+                        speed_cntl = RREG32_PCIE_P(PCIE_LC_SPEED_CNTL);
+                        speed_cntl &= ~LC_TARGET_LINK_SPEED_OVERRIDE_EN;
+                        WREG32_PCIE_P(PCIE_LC_SPEED_CNTL, speed_cntl);
+                }
+
+                speed_cntl = RREG32_PCIE_P(PCIE_LC_SPEED_CNTL);
+                speed_cntl |= LC_GEN2_EN_STRAP;
+                WREG32_PCIE_P(PCIE_LC_SPEED_CNTL, speed_cntl);
+
+        } else {
+                link_width_cntl = RREG32_PCIE_P(PCIE_LC_LINK_WIDTH_CNTL);
+                /* XXX: only disable it if gen1 bridge vendor == 0x111d or 0x1106 */
+                if (1)
+                        link_width_cntl |= LC_UPCONFIGURE_DIS;
+                else
+                        link_width_cntl &= ~LC_UPCONFIGURE_DIS;
+                WREG32_PCIE_P(PCIE_LC_LINK_WIDTH_CNTL, link_width_cntl);
+        }
+}
diff --git a/drivers/gpu/drm/radeon/r600d.h b/drivers/gpu/drm/radeon/r600d.h
index c89cfa8e0c0..a5d898b4bad 100644
--- a/drivers/gpu/drm/radeon/r600d.h
+++ b/drivers/gpu/drm/radeon/r600d.h
@@ -737,6 +737,45 @@
 #       define DxGRPH_PFLIP_INT_MASK                      (1 << 0)
 #       define DxGRPH_PFLIP_INT_TYPE                      (1 << 8)
 
+/* PCIE link stuff */
+#define PCIE_LC_TRAINING_CNTL                             0xa1 /* PCIE_P */
+#       define LC_POINT_7_PLUS_EN                         (1 << 6)
+#define PCIE_LC_LINK_WIDTH_CNTL                           0xa2 /* PCIE_P */
+#       define LC_LINK_WIDTH_SHIFT                        0
+#       define LC_LINK_WIDTH_MASK                         0x7
+#       define LC_LINK_WIDTH_X0                           0
+#       define LC_LINK_WIDTH_X1                           1
+#       define LC_LINK_WIDTH_X2                           2
+#       define LC_LINK_WIDTH_X4                           3
+#       define LC_LINK_WIDTH_X8                           4
+#       define LC_LINK_WIDTH_X16                          6
+#       define LC_LINK_WIDTH_RD_SHIFT                     4
+#       define LC_LINK_WIDTH_RD_MASK                      0x70
+#       define LC_RECONFIG_ARC_MISSING_ESCAPE             (1 << 7)
+#       define LC_RECONFIG_NOW                            (1 << 8)
+#       define LC_RENEGOTIATION_SUPPORT                   (1 << 9)
+#       define LC_RENEGOTIATE_EN                          (1 << 10)
+#       define LC_SHORT_RECONFIG_EN                       (1 << 11)
+#       define LC_UPCONFIGURE_SUPPORT                     (1 << 12)
+#       define LC_UPCONFIGURE_DIS                         (1 << 13)
+#define PCIE_LC_SPEED_CNTL                                0xa4 /* PCIE_P */
+#       define LC_GEN2_EN_STRAP                           (1 << 0)
+#       define LC_TARGET_LINK_SPEED_OVERRIDE_EN           (1 << 1)
+#       define LC_FORCE_EN_HW_SPEED_CHANGE                (1 << 5)
+#       define LC_FORCE_DIS_HW_SPEED_CHANGE               (1 << 6)
+#       define LC_SPEED_CHANGE_ATTEMPTS_ALLOWED_MASK      (0x3 << 8)
+#       define LC_SPEED_CHANGE_ATTEMPTS_ALLOWED_SHIFT     3
+#       define LC_CURRENT_DATA_RATE                       (1 << 11)
+#       define LC_VOLTAGE_TIMER_SEL_MASK                  (0xf << 14)
+#       define LC_CLR_FAILED_SPD_CHANGE_CNT               (1 << 21)
+#       define LC_OTHER_SIDE_EVER_SENT_GEN2               (1 << 23)
+#       define LC_OTHER_SIDE_SUPPORTS_GEN2                (1 << 24)
+#define MM_CFGREGS_CNTL                                   0x544c
+#       define MM_WR_TO_CFG_EN                            (1 << 3)
+#define LINK_CNTL2                                        0x88 /* F0 */
+#       define TARGET_LINK_SPEED_MASK                     (0xf << 0)
+#       define SELECTABLE_DEEMPHASIS                      (1 << 6)
+
 /*
  * PM4
  */
diff --git a/drivers/gpu/drm/radeon/radeon.h b/drivers/gpu/drm/radeon/radeon.h
index e9fb64c1e20..3e635c65190 100644
--- a/drivers/gpu/drm/radeon/radeon.h
+++ b/drivers/gpu/drm/radeon/radeon.h
@@ -1244,6 +1244,8 @@ static inline void r100_io_wreg(struct radeon_device *rdev, u32 reg, u32 v)
  */
 #define RREG8(reg) readb(((void __iomem *)rdev->rmmio) + (reg))
 #define WREG8(reg, v) writeb(v, ((void __iomem *)rdev->rmmio) + (reg))
+#define RREG16(reg) readw(((void __iomem *)rdev->rmmio) + (reg))
+#define WREG16(reg, v) writew(v, ((void __iomem *)rdev->rmmio) + (reg))
 #define RREG32(reg) r100_mm_rreg(rdev, (reg))
 #define DREG32(reg) printk(KERN_INFO "REGISTER: " #reg " : 0x%08X\n", r100_mm_rreg(rdev, (reg)))
 #define WREG32(reg, v) r100_mm_wreg(rdev, (reg), (v))
diff --git a/drivers/gpu/drm/radeon/rv770.c b/drivers/gpu/drm/radeon/rv770.c
index 645aa1fd761..3a264aa3a79 100644
--- a/drivers/gpu/drm/radeon/rv770.c
+++ b/drivers/gpu/drm/radeon/rv770.c
@@ -41,6 +41,7 @@
 
 static void rv770_gpu_init(struct radeon_device *rdev);
 void rv770_fini(struct radeon_device *rdev);
+static void rv770_pcie_gen2_enable(struct radeon_device *rdev);
 
 u32 rv770_page_flip(struct radeon_device *rdev, int crtc_id, u64 crtc_base)
 {
@@ -1124,6 +1125,9 @@ static int rv770_startup(struct radeon_device *rdev)
 {
         int r;
 
+        /* enable pcie gen2 link */
+        rv770_pcie_gen2_enable(rdev);
+
         if (!rdev->me_fw || !rdev->pfp_fw || !rdev->rlc_fw) {
                 r = r600_init_microcode(rdev);
                 if (r) {
@@ -1362,3 +1366,75 @@ void rv770_fini(struct radeon_device *rdev)
         rdev->bios = NULL;
         radeon_dummy_page_fini(rdev);
 }
+
+static void rv770_pcie_gen2_enable(struct radeon_device *rdev)
+{
+        u32 link_width_cntl, lanes, speed_cntl, tmp;
+        u16 link_cntl2;
+
+        if (rdev->flags & RADEON_IS_IGP)
+                return;
+
+        if (!(rdev->flags & RADEON_IS_PCIE))
+                return;
+
+        /* x2 cards have a special sequence */
+        if (ASIC_IS_X2(rdev))
+                return;
+
+        /* advertise upconfig capability */
+        link_width_cntl = RREG32_PCIE_P(PCIE_LC_LINK_WIDTH_CNTL);
+        link_width_cntl &= ~LC_UPCONFIGURE_DIS;
+        WREG32_PCIE_P(PCIE_LC_LINK_WIDTH_CNTL, link_width_cntl);
+        link_width_cntl = RREG32_PCIE_P(PCIE_LC_LINK_WIDTH_CNTL);
+        if (link_width_cntl & LC_RENEGOTIATION_SUPPORT) {
+                lanes = (link_width_cntl & LC_LINK_WIDTH_RD_MASK) >> LC_LINK_WIDTH_RD_SHIFT;
+                link_width_cntl &= ~(LC_LINK_WIDTH_MASK |
+                                     LC_RECONFIG_ARC_MISSING_ESCAPE);
+                link_width_cntl |= lanes | LC_RECONFIG_NOW |
+                        LC_RENEGOTIATE_EN | LC_UPCONFIGURE_SUPPORT;
+                WREG32_PCIE_P(PCIE_LC_LINK_WIDTH_CNTL, link_width_cntl);
+        } else {
+                link_width_cntl |= LC_UPCONFIGURE_DIS;
+                WREG32_PCIE_P(PCIE_LC_LINK_WIDTH_CNTL, link_width_cntl);
+        }
+
+        speed_cntl = RREG32_PCIE_P(PCIE_LC_SPEED_CNTL);
+        if ((speed_cntl & LC_OTHER_SIDE_EVER_SENT_GEN2) &&
+            (speed_cntl & LC_OTHER_SIDE_SUPPORTS_GEN2)) {
+
+                tmp = RREG32(0x541c);
+                WREG32(0x541c, tmp | 0x8);
+                WREG32(MM_CFGREGS_CNTL, MM_WR_TO_CFG_EN);
+                link_cntl2 = RREG16(0x4088);
+                link_cntl2 &= ~TARGET_LINK_SPEED_MASK;
+                link_cntl2 |= 0x2;
+                WREG16(0x4088, link_cntl2);
+                WREG32(MM_CFGREGS_CNTL, 0);
+
+                speed_cntl = RREG32_PCIE_P(PCIE_LC_SPEED_CNTL);
+                speed_cntl &= ~LC_TARGET_LINK_SPEED_OVERRIDE_EN;
+                WREG32_PCIE_P(PCIE_LC_SPEED_CNTL, speed_cntl);
+
+                speed_cntl = RREG32_PCIE_P(PCIE_LC_SPEED_CNTL);
+                speed_cntl |= LC_CLR_FAILED_SPD_CHANGE_CNT;
+                WREG32_PCIE_P(PCIE_LC_SPEED_CNTL, speed_cntl);
+
+                speed_cntl = RREG32_PCIE_P(PCIE_LC_SPEED_CNTL);
+                speed_cntl &= ~LC_CLR_FAILED_SPD_CHANGE_CNT;
+                WREG32_PCIE_P(PCIE_LC_SPEED_CNTL, speed_cntl);
+
+                speed_cntl = RREG32_PCIE_P(PCIE_LC_SPEED_CNTL);
+                speed_cntl |= LC_GEN2_EN_STRAP;
+                WREG32_PCIE_P(PCIE_LC_SPEED_CNTL, speed_cntl);
+
+        } else {
+                link_width_cntl = RREG32_PCIE_P(PCIE_LC_LINK_WIDTH_CNTL);
+                /* XXX: only disable it if gen1 bridge vendor == 0x111d or 0x1106 */
+                if (1)
+                        link_width_cntl |= LC_UPCONFIGURE_DIS;
+                else
+                        link_width_cntl &= ~LC_UPCONFIGURE_DIS;
+                WREG32_PCIE_P(PCIE_LC_LINK_WIDTH_CNTL, link_width_cntl);
+        }
+}
diff --git a/drivers/gpu/drm/radeon/rv770d.h b/drivers/gpu/drm/radeon/rv770d.h
index fc77e1e1a17..abc8cf5a367 100644
--- a/drivers/gpu/drm/radeon/rv770d.h
+++ b/drivers/gpu/drm/radeon/rv770d.h
@@ -360,4 +360,42 @@
 #define D1GRPH_SECONDARY_SURFACE_ADDRESS_HIGH             0x691c
 #define D2GRPH_SECONDARY_SURFACE_ADDRESS_HIGH             0x611c
 
+/* PCIE link stuff */
+#define PCIE_LC_TRAINING_CNTL                             0xa1 /* PCIE_P */
+#define PCIE_LC_LINK_WIDTH_CNTL                           0xa2 /* PCIE_P */
+#       define LC_LINK_WIDTH_SHIFT                        0
+#       define LC_LINK_WIDTH_MASK                         0x7
+#       define LC_LINK_WIDTH_X0                           0
+#       define LC_LINK_WIDTH_X1                           1
+#       define LC_LINK_WIDTH_X2                           2
+#       define LC_LINK_WIDTH_X4                           3
+#       define LC_LINK_WIDTH_X8                           4
+#       define LC_LINK_WIDTH_X16                          6
+#       define LC_LINK_WIDTH_RD_SHIFT                     4
+#       define LC_LINK_WIDTH_RD_MASK                      0x70
+#       define LC_RECONFIG_ARC_MISSING_ESCAPE             (1 << 7)
+#       define LC_RECONFIG_NOW                            (1 << 8)
+#       define LC_RENEGOTIATION_SUPPORT                   (1 << 9)
+#       define LC_RENEGOTIATE_EN                          (1 << 10)
+#       define LC_SHORT_RECONFIG_EN                       (1 << 11)
+#       define LC_UPCONFIGURE_SUPPORT                     (1 << 12)
+#       define LC_UPCONFIGURE_DIS                         (1 << 13)
+#define PCIE_LC_SPEED_CNTL                                0xa4 /* PCIE_P */
+#       define LC_GEN2_EN_STRAP                           (1 << 0)
+#       define LC_TARGET_LINK_SPEED_OVERRIDE_EN           (1 << 1)
+#       define LC_FORCE_EN_HW_SPEED_CHANGE                (1 << 5)
+#       define LC_FORCE_DIS_HW_SPEED_CHANGE               (1 << 6)
+#       define LC_SPEED_CHANGE_ATTEMPTS_ALLOWED_MASK      (0x3 << 8)
+#       define LC_SPEED_CHANGE_ATTEMPTS_ALLOWED_SHIFT     3
+#       define LC_CURRENT_DATA_RATE                       (1 << 11)
+#       define LC_VOLTAGE_TIMER_SEL_MASK                  (0xf << 14)
+#       define LC_CLR_FAILED_SPD_CHANGE_CNT               (1 << 21)
+#       define LC_OTHER_SIDE_EVER_SENT_GEN2               (1 << 23)
+#       define LC_OTHER_SIDE_SUPPORTS_GEN2                (1 << 24)
+#define MM_CFGREGS_CNTL                                   0x544c
+#       define MM_WR_TO_CFG_EN                            (1 << 3)
+#define LINK_CNTL2                                        0x88 /* F0 */
+#       define TARGET_LINK_SPEED_MASK                     (0xf << 0)
+#       define SELECTABLE_DEEMPHASIS                      (1 << 6)
+
 #endif