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path: root/drivers/gpu/drm/i915/intel_sideband.c
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Diffstat (limited to 'drivers/gpu/drm/i915/intel_sideband.c')
-rw-r--r--drivers/gpu/drm/i915/intel_sideband.c177
1 files changed, 177 insertions, 0 deletions
diff --git a/drivers/gpu/drm/i915/intel_sideband.c b/drivers/gpu/drm/i915/intel_sideband.c
new file mode 100644
index 0000000..9a0e6c5
--- /dev/null
+++ b/drivers/gpu/drm/i915/intel_sideband.c
@@ -0,0 +1,177 @@
+/*
+ * Copyright © 2013 Intel Corporation
+ *
+ * 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 (including the next
+ * paragraph) 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 AUTHORS OR COPYRIGHT HOLDERS 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 "i915_drv.h"
+#include "intel_drv.h"
+
+/* IOSF sideband */
+static int vlv_sideband_rw(struct drm_i915_private *dev_priv, u32 devfn,
+ u32 port, u32 opcode, u32 addr, u32 *val)
+{
+ u32 cmd, be = 0xf, bar = 0;
+ bool is_read = (opcode == PUNIT_OPCODE_REG_READ ||
+ opcode == DPIO_OPCODE_REG_READ);
+
+ cmd = (devfn << IOSF_DEVFN_SHIFT) | (opcode << IOSF_OPCODE_SHIFT) |
+ (port << IOSF_PORT_SHIFT) | (be << IOSF_BYTE_ENABLES_SHIFT) |
+ (bar << IOSF_BAR_SHIFT);
+
+ WARN_ON(!mutex_is_locked(&dev_priv->dpio_lock));
+
+ if (wait_for((I915_READ(VLV_IOSF_DOORBELL_REQ) & IOSF_SB_BUSY) == 0, 5)) {
+ DRM_DEBUG_DRIVER("IOSF sideband idle wait (%s) timed out\n",
+ is_read ? "read" : "write");
+ return -EAGAIN;
+ }
+
+ I915_WRITE(VLV_IOSF_ADDR, addr);
+ if (!is_read)
+ I915_WRITE(VLV_IOSF_DATA, *val);
+ I915_WRITE(VLV_IOSF_DOORBELL_REQ, cmd);
+
+ if (wait_for((I915_READ(VLV_IOSF_DOORBELL_REQ) & IOSF_SB_BUSY) == 0, 5)) {
+ DRM_DEBUG_DRIVER("IOSF sideband finish wait (%s) timed out\n",
+ is_read ? "read" : "write");
+ return -ETIMEDOUT;
+ }
+
+ if (is_read)
+ *val = I915_READ(VLV_IOSF_DATA);
+ I915_WRITE(VLV_IOSF_DATA, 0);
+
+ return 0;
+}
+
+u32 vlv_punit_read(struct drm_i915_private *dev_priv, u8 addr)
+{
+ u32 val = 0;
+
+ WARN_ON(!mutex_is_locked(&dev_priv->rps.hw_lock));
+
+ mutex_lock(&dev_priv->dpio_lock);
+ vlv_sideband_rw(dev_priv, PCI_DEVFN(2, 0), IOSF_PORT_PUNIT,
+ PUNIT_OPCODE_REG_READ, addr, &val);
+ mutex_unlock(&dev_priv->dpio_lock);
+
+ return val;
+}
+
+void vlv_punit_write(struct drm_i915_private *dev_priv, u8 addr, u32 val)
+{
+ WARN_ON(!mutex_is_locked(&dev_priv->rps.hw_lock));
+
+ mutex_lock(&dev_priv->dpio_lock);
+ vlv_sideband_rw(dev_priv, PCI_DEVFN(2, 0), IOSF_PORT_PUNIT,
+ PUNIT_OPCODE_REG_WRITE, addr, &val);
+ mutex_unlock(&dev_priv->dpio_lock);
+}
+
+u32 vlv_nc_read(struct drm_i915_private *dev_priv, u8 addr)
+{
+ u32 val = 0;
+
+ WARN_ON(!mutex_is_locked(&dev_priv->rps.hw_lock));
+
+ mutex_lock(&dev_priv->dpio_lock);
+ vlv_sideband_rw(dev_priv, PCI_DEVFN(2, 0), IOSF_PORT_NC,
+ PUNIT_OPCODE_REG_READ, addr, &val);
+ mutex_unlock(&dev_priv->dpio_lock);
+
+ return val;
+}
+
+u32 vlv_dpio_read(struct drm_i915_private *dev_priv, int reg)
+{
+ u32 val = 0;
+
+ vlv_sideband_rw(dev_priv, DPIO_DEVFN, IOSF_PORT_DPIO,
+ DPIO_OPCODE_REG_READ, reg, &val);
+
+ return val;
+}
+
+void vlv_dpio_write(struct drm_i915_private *dev_priv, int reg, u32 val)
+{
+ vlv_sideband_rw(dev_priv, DPIO_DEVFN, IOSF_PORT_DPIO,
+ DPIO_OPCODE_REG_WRITE, reg, &val);
+}
+
+/* SBI access */
+u32 intel_sbi_read(struct drm_i915_private *dev_priv, u16 reg,
+ enum intel_sbi_destination destination)
+{
+ u32 value = 0;
+ WARN_ON(!mutex_is_locked(&dev_priv->dpio_lock));
+
+ if (wait_for((I915_READ(SBI_CTL_STAT) & SBI_BUSY) == 0,
+ 100)) {
+ DRM_ERROR("timeout waiting for SBI to become ready\n");
+ return 0;
+ }
+
+ I915_WRITE(SBI_ADDR, (reg << 16));
+
+ if (destination == SBI_ICLK)
+ value = SBI_CTL_DEST_ICLK | SBI_CTL_OP_CRRD;
+ else
+ value = SBI_CTL_DEST_MPHY | SBI_CTL_OP_IORD;
+ I915_WRITE(SBI_CTL_STAT, value | SBI_BUSY);
+
+ if (wait_for((I915_READ(SBI_CTL_STAT) & (SBI_BUSY | SBI_RESPONSE_FAIL)) == 0,
+ 100)) {
+ DRM_ERROR("timeout waiting for SBI to complete read transaction\n");
+ return 0;
+ }
+
+ return I915_READ(SBI_DATA);
+}
+
+void intel_sbi_write(struct drm_i915_private *dev_priv, u16 reg, u32 value,
+ enum intel_sbi_destination destination)
+{
+ u32 tmp;
+
+ WARN_ON(!mutex_is_locked(&dev_priv->dpio_lock));
+
+ if (wait_for((I915_READ(SBI_CTL_STAT) & SBI_BUSY) == 0,
+ 100)) {
+ DRM_ERROR("timeout waiting for SBI to become ready\n");
+ return;
+ }
+
+ I915_WRITE(SBI_ADDR, (reg << 16));
+ I915_WRITE(SBI_DATA, value);
+
+ if (destination == SBI_ICLK)
+ tmp = SBI_CTL_DEST_ICLK | SBI_CTL_OP_CRWR;
+ else
+ tmp = SBI_CTL_DEST_MPHY | SBI_CTL_OP_IOWR;
+ I915_WRITE(SBI_CTL_STAT, SBI_BUSY | tmp);
+
+ if (wait_for((I915_READ(SBI_CTL_STAT) & (SBI_BUSY | SBI_RESPONSE_FAIL)) == 0,
+ 100)) {
+ DRM_ERROR("timeout waiting for SBI to complete write transaction\n");
+ return;
+ }
+}
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