drm/i915/hsw+: Add support for multiple power well regs

Future platforms increase the number of power wells which require
additional control registers. A convenient way to select the correct
register is to use the high bits of the power well ID as index. This
patch only prepares for this, while upcoming platform enabling patches
will add the actual new power well IDs and corresponding power well
control registers.

Cc: Paulo Zanoni <[e-mail]>
Cc: Animesh Manna <[e-mail]>
Cc: Rakshmi Bhatia <[e-mail]>
Signed-off-by: Imre Deak <[e-mail]>
Reviewed-by: Animesh Manna <[e-mail]>
Reviewed-by: Rakshmi Bhatia <[e-mail]>
Link: https://patchwork.freedesktop.org/patch/msgid/[e-mail]

drivers/gpu/drm/i915/gvt/handlers.c

···
 	MMIO_D(GEN6_RC6p_THRESHOLD, D_ALL);
 	MMIO_D(GEN6_RC6pp_THRESHOLD, D_ALL);
 	MMIO_D(GEN6_PMINTRMSK, D_ALL);
-	MMIO_DH(HSW_PWR_WELL_BIOS, D_BDW, NULL, power_well_ctl_mmio_write);
-	MMIO_DH(HSW_PWR_WELL_DRIVER, D_BDW, NULL, power_well_ctl_mmio_write);
-	MMIO_DH(HSW_PWR_WELL_KVMR, D_BDW, NULL, power_well_ctl_mmio_write);
-	MMIO_DH(HSW_PWR_WELL_DEBUG, D_BDW, NULL, power_well_ctl_mmio_write);
+	/*
+	 * Use an arbitrary power well controlled by the PWR_WELL_CTL
+	 * register.
+	 */
+	MMIO_DH(HSW_PWR_WELL_CTL_BIOS(HSW_DISP_PW_GLOBAL), D_BDW, NULL,
+		power_well_ctl_mmio_write);
+	MMIO_DH(HSW_PWR_WELL_CTL_DRIVER(HSW_DISP_PW_GLOBAL), D_BDW, NULL,
+		power_well_ctl_mmio_write);
+	MMIO_DH(HSW_PWR_WELL_CTL_KVMR, D_BDW, NULL, power_well_ctl_mmio_write);
+	MMIO_DH(HSW_PWR_WELL_CTL_DEBUG(HSW_DISP_PW_GLOBAL), D_BDW, NULL,
+		power_well_ctl_mmio_write);
 	MMIO_DH(HSW_PWR_WELL_CTL5, D_BDW, NULL, power_well_ctl_mmio_write);
 	MMIO_DH(HSW_PWR_WELL_CTL6, D_BDW, NULL, power_well_ctl_mmio_write);
 
···
 	MMIO_F(_DPD_AUX_CH_CTL, 6 * 4, 0, 0, 0, D_SKL_PLUS, NULL,
 						dp_aux_ch_ctl_mmio_write);
 
-	MMIO_D(HSW_PWR_WELL_BIOS, D_SKL_PLUS);
-	MMIO_DH(HSW_PWR_WELL_DRIVER, D_SKL_PLUS, NULL,
-						skl_power_well_ctl_write);
+	/*
+	 * Use an arbitrary power well controlled by the PWR_WELL_CTL
+	 * register.
+	 */
+	MMIO_D(HSW_PWR_WELL_CTL_BIOS(SKL_DISP_PW_MISC_IO), D_SKL_PLUS);
+	MMIO_DH(HSW_PWR_WELL_CTL_DRIVER(SKL_DISP_PW_MISC_IO), D_SKL_PLUS, NULL,
+		skl_power_well_ctl_write);
+	MMIO_DH(GEN6_PCODE_MAILBOX, D_SKL_PLUS, NULL, mailbox_write);
 
 	MMIO_D(0xa210, D_SKL_PLUS);
 	MMIO_D(GEN9_MEDIA_PG_IDLE_HYSTERESIS, D_SKL_PLUS);

drivers/gpu/drm/i915/i915_reg.h

···
 
 	/*
 	 * HSW/BDW
-	 *  - HSW_PWR_WELL_DRIVER (status bit: id*2, req bit: id*2+1)
+	 *  - HSW_PWR_WELL_CTL_DRIVER(0) (status bit: id*2, req bit: id*2+1)
 	 */
 	HSW_DISP_PW_GLOBAL = 15,
 
 	/*
 	 * GEN9+
-	 *  - HSW_PWR_WELL_DRIVER (status bit: id*2, req bit: id*2+1)
+	 *  - HSW_PWR_WELL_CTL_DRIVER(0) (status bit: id*2, req bit: id*2+1)
 	 */
 	SKL_DISP_PW_MISC_IO = 0,
 	SKL_DISP_PW_DDI_A_E,
···
 #define   SKL_AUD_CODEC_WAKE_SIGNAL		(1 << 15)
 
 /* HSW Power Wells */
-#define HSW_PWR_WELL_BIOS			_MMIO(0x45400) /* CTL1 */
-#define HSW_PWR_WELL_DRIVER			_MMIO(0x45404) /* CTL2 */
-#define HSW_PWR_WELL_KVMR			_MMIO(0x45408) /* CTL3 */
-#define HSW_PWR_WELL_DEBUG			_MMIO(0x4540C) /* CTL4 */
-#define _HSW_PW_SHIFT(pw)			((pw) * 2)
+#define _HSW_PWR_WELL_CTL1			0x45400
+#define _HSW_PWR_WELL_CTL2			0x45404
+#define _HSW_PWR_WELL_CTL3			0x45408
+#define _HSW_PWR_WELL_CTL4			0x4540C
+
+/*
+ * Each power well control register contains up to 16 (request, status) HW
+ * flag tuples. The register index and HW flag shift is determined by the
+ * power well ID (see i915_power_well_id). There are 4 possible sources of
+ * power well requests each source having its own set of control registers:
+ * BIOS, DRIVER, KVMR, DEBUG.
+ */
+#define _HSW_PW_REG_IDX(pw)			((pw) >> 4)
+#define _HSW_PW_SHIFT(pw)			(((pw) & 0xf) * 2)
+/* TODO: Add all PWR_WELL_CTL registers below for new platforms */
+#define HSW_PWR_WELL_CTL_BIOS(pw)	_MMIO(_PICK(_HSW_PW_REG_IDX(pw),       \
+						    _HSW_PWR_WELL_CTL1))
+#define HSW_PWR_WELL_CTL_DRIVER(pw)	_MMIO(_PICK(_HSW_PW_REG_IDX(pw),       \
+						    _HSW_PWR_WELL_CTL2))
+#define HSW_PWR_WELL_CTL_KVMR		_MMIO(_HSW_PWR_WELL_CTL3)
+#define HSW_PWR_WELL_CTL_DEBUG(pw)	_MMIO(_PICK(_HSW_PW_REG_IDX(pw),       \
+						    _HSW_PWR_WELL_CTL4))
+
 #define   HSW_PWR_WELL_CTL_REQ(pw)		(1 << (_HSW_PW_SHIFT(pw) + 1))
 #define   HSW_PWR_WELL_CTL_STATE(pw)		(1 << _HSW_PW_SHIFT(pw))
 #define HSW_PWR_WELL_CTL5			_MMIO(0x45410)

drivers/gpu/drm/i915/intel_display.c

···
 		I915_STATE_WARN(crtc->active, "CRTC for pipe %c enabled\n",
 		     pipe_name(crtc->pipe));
 
-	I915_STATE_WARN(I915_READ(HSW_PWR_WELL_DRIVER), "Power well on\n");
+	I915_STATE_WARN(I915_READ(HSW_PWR_WELL_CTL_DRIVER(HSW_DISP_PW_GLOBAL)),
+			"Display power well on\n");
 	I915_STATE_WARN(I915_READ(SPLL_CTL) & SPLL_PLL_ENABLE, "SPLL enabled\n");
 	I915_STATE_WARN(I915_READ(WRPLL_CTL(0)) & WRPLL_PLL_ENABLE, "WRPLL1 enabled\n");
 	I915_STATE_WARN(I915_READ(WRPLL_CTL(1)) & WRPLL_PLL_ENABLE, "WRPLL2 enabled\n");
···
 		return NULL;
 
 	if (IS_HASWELL(dev_priv) || IS_BROADWELL(dev_priv))
-		error->power_well_driver = I915_READ(HSW_PWR_WELL_DRIVER);
+		error->power_well_driver =
+			I915_READ(HSW_PWR_WELL_CTL_DRIVER(HSW_DISP_PW_GLOBAL));
 
 	for_each_pipe(dev_priv, i) {
 		error->pipe[i].power_domain_on =

drivers/gpu/drm/i915/intel_runtime_pm.c

···
 
 	/* Timeout for PW1:10 us, AUX:not specified, other PWs:20 us. */
 	WARN_ON(intel_wait_for_register(dev_priv,
-					HSW_PWR_WELL_DRIVER,
+					HSW_PWR_WELL_CTL_DRIVER(id),
 					HSW_PWR_WELL_CTL_STATE(id),
 					HSW_PWR_WELL_CTL_STATE(id),
 					1));
···
 	u32 req_mask = HSW_PWR_WELL_CTL_REQ(id);
 	u32 ret;
 
-	ret = I915_READ(HSW_PWR_WELL_BIOS) & req_mask ? 1 : 0;
-	ret |= I915_READ(HSW_PWR_WELL_DRIVER) & req_mask ? 2 : 0;
-	ret |= I915_READ(HSW_PWR_WELL_KVMR) & req_mask ? 4 : 0;
-	ret |= I915_READ(HSW_PWR_WELL_DEBUG) & req_mask ? 8 : 0;
+	ret = I915_READ(HSW_PWR_WELL_CTL_BIOS(id)) & req_mask ? 1 : 0;
+	ret |= I915_READ(HSW_PWR_WELL_CTL_DRIVER(id)) & req_mask ? 2 : 0;
+	ret |= I915_READ(HSW_PWR_WELL_CTL_KVMR) & req_mask ? 4 : 0;
+	ret |= I915_READ(HSW_PWR_WELL_CTL_DEBUG(id)) & req_mask ? 8 : 0;
 
 	return ret;
 }
···
 	 * Skip the wait in case any of the request bits are set and print a
 	 * diagnostic message.
 	 */
-	wait_for((disabled = !(I915_READ(HSW_PWR_WELL_DRIVER) &
+	wait_for((disabled = !(I915_READ(HSW_PWR_WELL_CTL_DRIVER(id)) &
 			       HSW_PWR_WELL_CTL_STATE(id))) ||
 		 (reqs = hsw_power_well_requesters(dev_priv, id)), 1);
 	if (disabled)
···
 			gen9_wait_for_power_well_fuses(dev_priv, SKL_PG0);
 	}
 
-	val = I915_READ(HSW_PWR_WELL_DRIVER);
-	I915_WRITE(HSW_PWR_WELL_DRIVER, val | HSW_PWR_WELL_CTL_REQ(id));
+	val = I915_READ(HSW_PWR_WELL_CTL_DRIVER(id));
+	I915_WRITE(HSW_PWR_WELL_CTL_DRIVER(id), val | HSW_PWR_WELL_CTL_REQ(id));
 	hsw_wait_for_power_well_enable(dev_priv, power_well);
 
 	if (wait_fuses)
···
 
 	hsw_power_well_pre_disable(dev_priv, power_well->hsw.irq_pipe_mask);
 
-	val = I915_READ(HSW_PWR_WELL_DRIVER);
-	I915_WRITE(HSW_PWR_WELL_DRIVER, val & ~HSW_PWR_WELL_CTL_REQ(id));
+	val = I915_READ(HSW_PWR_WELL_CTL_DRIVER(id));
+	I915_WRITE(HSW_PWR_WELL_CTL_DRIVER(id),
+		   val & ~HSW_PWR_WELL_CTL_REQ(id));
 	hsw_wait_for_power_well_disable(dev_priv, power_well);
 }
 
···
 	enum i915_power_well_id id = power_well->id;
 	u32 mask = HSW_PWR_WELL_CTL_REQ(id) | HSW_PWR_WELL_CTL_STATE(id);
 
-	return (I915_READ(HSW_PWR_WELL_DRIVER) & mask) == mask;
+	return (I915_READ(HSW_PWR_WELL_CTL_DRIVER(id)) & mask) == mask;
 }
 
 static void assert_can_enable_dc9(struct drm_i915_private *dev_priv)
 {
+	enum i915_power_well_id id = SKL_DISP_PW_2;
+
 	WARN_ONCE((I915_READ(DC_STATE_EN) & DC_STATE_EN_DC9),
 		  "DC9 already programmed to be enabled.\n");
 	WARN_ONCE(I915_READ(DC_STATE_EN) & DC_STATE_EN_UPTO_DC5,
 		  "DC5 still not disabled to enable DC9.\n");
-	WARN_ONCE(I915_READ(HSW_PWR_WELL_DRIVER) &
-		  HSW_PWR_WELL_CTL_REQ(SKL_DISP_PW_2),
+	WARN_ONCE(I915_READ(HSW_PWR_WELL_CTL_DRIVER(id)) &
+		  HSW_PWR_WELL_CTL_REQ(id),
 		  "Power well 2 on.\n");
 	WARN_ONCE(intel_irqs_enabled(dev_priv),
 		  "Interrupts not disabled yet.\n");
···
 {
 	enum i915_power_well_id id = power_well->id;
 	u32 mask = HSW_PWR_WELL_CTL_REQ(id);
-	u32 bios_req = I915_READ(HSW_PWR_WELL_BIOS);
+	u32 bios_req = I915_READ(HSW_PWR_WELL_CTL_BIOS(id));
 
 	/* Take over the request bit if set by BIOS. */
 	if (bios_req & mask) {
-		u32 drv_req = I915_READ(HSW_PWR_WELL_DRIVER);
+		u32 drv_req = I915_READ(HSW_PWR_WELL_CTL_DRIVER(id));
 
 		if (!(drv_req & mask))
-			I915_WRITE(HSW_PWR_WELL_DRIVER, drv_req | mask);
-		I915_WRITE(HSW_PWR_WELL_BIOS, bios_req & ~mask);
+			I915_WRITE(HSW_PWR_WELL_CTL_DRIVER(id), drv_req | mask);
+		I915_WRITE(HSW_PWR_WELL_CTL_BIOS(id), bios_req & ~mask);
 	}
 }