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path: root/drivers/gpu/drm/vc4/vc4_txp.c
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Diffstat (limited to 'drivers/gpu/drm/vc4/vc4_txp.c')
-rw-r--r--drivers/gpu/drm/vc4/vc4_txp.c477
1 files changed, 477 insertions, 0 deletions
diff --git a/drivers/gpu/drm/vc4/vc4_txp.c b/drivers/gpu/drm/vc4/vc4_txp.c
new file mode 100644
index 000000000000..6e23c50168f9
--- /dev/null
+++ b/drivers/gpu/drm/vc4/vc4_txp.c
@@ -0,0 +1,477 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright © 2018 Broadcom
+ *
+ * Authors:
+ * Eric Anholt <eric@anholt.net>
+ * Boris Brezillon <boris.brezillon@bootlin.com>
+ */
+
+#include <drm/drm_atomic_helper.h>
+#include <drm/drm_fb_cma_helper.h>
+#include <drm/drm_crtc_helper.h>
+#include <drm/drm_edid.h>
+#include <drm/drm_panel.h>
+#include <drm/drm_writeback.h>
+#include <linux/clk.h>
+#include <linux/component.h>
+#include <linux/of_graph.h>
+#include <linux/of_platform.h>
+#include <linux/pm_runtime.h>
+
+#include "vc4_drv.h"
+#include "vc4_regs.h"
+
+/* Base address of the output. Raster formats must be 4-byte aligned,
+ * T and LT must be 16-byte aligned or maybe utile-aligned (docs are
+ * inconsistent, but probably utile).
+ */
+#define TXP_DST_PTR 0x00
+
+/* Pitch in bytes for raster images, 16-byte aligned. For tiled, it's
+ * the width in tiles.
+ */
+#define TXP_DST_PITCH 0x04
+/* For T-tiled imgaes, DST_PITCH should be the number of tiles wide,
+ * shifted up.
+ */
+# define TXP_T_TILE_WIDTH_SHIFT 7
+/* For LT-tiled images, DST_PITCH should be the number of utiles wide,
+ * shifted up.
+ */
+# define TXP_LT_TILE_WIDTH_SHIFT 4
+
+/* Pre-rotation width/height of the image. Must match HVS config.
+ *
+ * If TFORMAT and 32-bit, limit is 1920 for 32-bit and 3840 to 16-bit
+ * and width/height must be tile or utile-aligned as appropriate. If
+ * transposing (rotating), width is limited to 1920.
+ *
+ * Height is limited to various numbers between 4088 and 4095. I'd
+ * just use 4088 to be safe.
+ */
+#define TXP_DIM 0x08
+# define TXP_HEIGHT_SHIFT 16
+# define TXP_HEIGHT_MASK GENMASK(31, 16)
+# define TXP_WIDTH_SHIFT 0
+# define TXP_WIDTH_MASK GENMASK(15, 0)
+
+#define TXP_DST_CTRL 0x0c
+/* These bits are set to 0x54 */
+#define TXP_PILOT_SHIFT 24
+#define TXP_PILOT_MASK GENMASK(31, 24)
+/* Bits 22-23 are set to 0x01 */
+#define TXP_VERSION_SHIFT 22
+#define TXP_VERSION_MASK GENMASK(23, 22)
+
+/* Powers down the internal memory. */
+# define TXP_POWERDOWN BIT(21)
+
+/* Enables storing the alpha component in 8888/4444, instead of
+ * filling with ~ALPHA_INVERT.
+ */
+# define TXP_ALPHA_ENABLE BIT(20)
+
+/* 4 bits, each enables stores for a channel in each set of 4 bytes.
+ * Set to 0xf for normal operation.
+ */
+# define TXP_BYTE_ENABLE_SHIFT 16
+# define TXP_BYTE_ENABLE_MASK GENMASK(19, 16)
+
+/* Debug: Generate VSTART again at EOF. */
+# define TXP_VSTART_AT_EOF BIT(15)
+
+/* Debug: Terminate the current frame immediately. Stops AXI
+ * writes.
+ */
+# define TXP_ABORT BIT(14)
+
+# define TXP_DITHER BIT(13)
+
+/* Inverts alpha if TXP_ALPHA_ENABLE, chooses fill value for
+ * !TXP_ALPHA_ENABLE.
+ */
+# define TXP_ALPHA_INVERT BIT(12)
+
+/* Note: I've listed the channels here in high bit (in byte 3/2/1) to
+ * low bit (in byte 0) order.
+ */
+# define TXP_FORMAT_SHIFT 8
+# define TXP_FORMAT_MASK GENMASK(11, 8)
+# define TXP_FORMAT_ABGR4444 0
+# define TXP_FORMAT_ARGB4444 1
+# define TXP_FORMAT_BGRA4444 2
+# define TXP_FORMAT_RGBA4444 3
+# define TXP_FORMAT_BGR565 6
+# define TXP_FORMAT_RGB565 7
+/* 888s are non-rotated, raster-only */
+# define TXP_FORMAT_BGR888 8
+# define TXP_FORMAT_RGB888 9
+# define TXP_FORMAT_ABGR8888 12
+# define TXP_FORMAT_ARGB8888 13
+# define TXP_FORMAT_BGRA8888 14
+# define TXP_FORMAT_RGBA8888 15
+
+/* If TFORMAT is set, generates LT instead of T format. */
+# define TXP_LINEAR_UTILE BIT(7)
+
+/* Rotate output by 90 degrees. */
+# define TXP_TRANSPOSE BIT(6)
+
+/* Generate a tiled format for V3D. */
+# define TXP_TFORMAT BIT(5)
+
+/* Generates some undefined test mode output. */
+# define TXP_TEST_MODE BIT(4)
+
+/* Request odd field from HVS. */
+# define TXP_FIELD BIT(3)
+
+/* Raise interrupt when idle. */
+# define TXP_EI BIT(2)
+
+/* Set when generating a frame, clears when idle. */
+# define TXP_BUSY BIT(1)
+
+/* Starts a frame. Self-clearing. */
+# define TXP_GO BIT(0)
+
+/* Number of lines received and committed to memory. */
+#define TXP_PROGRESS 0x10
+
+#define TXP_READ(offset) readl(txp->regs + (offset))
+#define TXP_WRITE(offset, val) writel(val, txp->regs + (offset))
+
+struct vc4_txp {
+ struct platform_device *pdev;
+
+ struct drm_writeback_connector connector;
+
+ void __iomem *regs;
+};
+
+static inline struct vc4_txp *encoder_to_vc4_txp(struct drm_encoder *encoder)
+{
+ return container_of(encoder, struct vc4_txp, connector.encoder);
+}
+
+static inline struct vc4_txp *connector_to_vc4_txp(struct drm_connector *conn)
+{
+ return container_of(conn, struct vc4_txp, connector.base);
+}
+
+#define TXP_REG(reg) { reg, #reg }
+static const struct {
+ u32 reg;
+ const char *name;
+} txp_regs[] = {
+ TXP_REG(TXP_DST_PTR),
+ TXP_REG(TXP_DST_PITCH),
+ TXP_REG(TXP_DIM),
+ TXP_REG(TXP_DST_CTRL),
+ TXP_REG(TXP_PROGRESS),
+};
+
+#ifdef CONFIG_DEBUG_FS
+int vc4_txp_debugfs_regs(struct seq_file *m, void *unused)
+{
+ struct drm_info_node *node = (struct drm_info_node *)m->private;
+ struct drm_device *dev = node->minor->dev;
+ struct vc4_dev *vc4 = to_vc4_dev(dev);
+ struct vc4_txp *txp = vc4->txp;
+ int i;
+
+ if (!txp)
+ return 0;
+
+ for (i = 0; i < ARRAY_SIZE(txp_regs); i++) {
+ seq_printf(m, "%s (0x%04x): 0x%08x\n",
+ txp_regs[i].name, txp_regs[i].reg,
+ TXP_READ(txp_regs[i].reg));
+ }
+
+ return 0;
+}
+#endif
+
+static int vc4_txp_connector_get_modes(struct drm_connector *connector)
+{
+ struct drm_device *dev = connector->dev;
+
+ return drm_add_modes_noedid(connector, dev->mode_config.max_width,
+ dev->mode_config.max_height);
+}
+
+static enum drm_mode_status
+vc4_txp_connector_mode_valid(struct drm_connector *connector,
+ struct drm_display_mode *mode)
+{
+ struct drm_device *dev = connector->dev;
+ struct drm_mode_config *mode_config = &dev->mode_config;
+ int w = mode->hdisplay, h = mode->vdisplay;
+
+ if (w < mode_config->min_width || w > mode_config->max_width)
+ return MODE_BAD_HVALUE;
+
+ if (h < mode_config->min_height || h > mode_config->max_height)
+ return MODE_BAD_VVALUE;
+
+ return MODE_OK;
+}
+
+static const u32 drm_fmts[] = {
+ DRM_FORMAT_RGB888,
+ DRM_FORMAT_BGR888,
+ DRM_FORMAT_XRGB8888,
+ DRM_FORMAT_XBGR8888,
+ DRM_FORMAT_ARGB8888,
+ DRM_FORMAT_ABGR8888,
+ DRM_FORMAT_RGBX8888,
+ DRM_FORMAT_BGRX8888,
+ DRM_FORMAT_RGBA8888,
+ DRM_FORMAT_BGRA8888,
+};
+
+static const u32 txp_fmts[] = {
+ TXP_FORMAT_RGB888,
+ TXP_FORMAT_BGR888,
+ TXP_FORMAT_ARGB8888,
+ TXP_FORMAT_ABGR8888,
+ TXP_FORMAT_ARGB8888,
+ TXP_FORMAT_ABGR8888,
+ TXP_FORMAT_RGBA8888,
+ TXP_FORMAT_BGRA8888,
+ TXP_FORMAT_RGBA8888,
+ TXP_FORMAT_BGRA8888,
+};
+
+static int vc4_txp_connector_atomic_check(struct drm_connector *conn,
+ struct drm_connector_state *conn_state)
+{
+ struct drm_crtc_state *crtc_state;
+ struct drm_gem_cma_object *gem;
+ struct drm_framebuffer *fb;
+ int i;
+
+ if (!conn_state->writeback_job || !conn_state->writeback_job->fb)
+ return 0;
+
+ crtc_state = drm_atomic_get_new_crtc_state(conn_state->state,
+ conn_state->crtc);
+
+ fb = conn_state->writeback_job->fb;
+ if (fb->width != crtc_state->mode.hdisplay ||
+ fb->height != crtc_state->mode.vdisplay) {
+ DRM_DEBUG_KMS("Invalid framebuffer size %ux%u\n",
+ fb->width, fb->height);
+ return -EINVAL;
+ }
+
+ for (i = 0; i < ARRAY_SIZE(drm_fmts); i++) {
+ if (fb->format->format == drm_fmts[i])
+ break;
+ }
+
+ if (i == ARRAY_SIZE(drm_fmts))
+ return -EINVAL;
+
+ gem = drm_fb_cma_get_gem_obj(fb, 0);
+
+ /* Pitch must be aligned on 16 bytes. */
+ if (fb->pitches[0] & GENMASK(3, 0))
+ return -EINVAL;
+
+ vc4_crtc_txp_armed(crtc_state);
+
+ return 0;
+}
+
+static void vc4_txp_connector_atomic_commit(struct drm_connector *conn,
+ struct drm_connector_state *conn_state)
+{
+ struct vc4_txp *txp = connector_to_vc4_txp(conn);
+ struct drm_gem_cma_object *gem;
+ struct drm_display_mode *mode;
+ struct drm_framebuffer *fb;
+ u32 ctrl;
+ int i;
+
+ if (WARN_ON(!conn_state->writeback_job ||
+ !conn_state->writeback_job->fb))
+ return;
+
+ mode = &conn_state->crtc->state->adjusted_mode;
+ fb = conn_state->writeback_job->fb;
+
+ for (i = 0; i < ARRAY_SIZE(drm_fmts); i++) {
+ if (fb->format->format == drm_fmts[i])
+ break;
+ }
+
+ if (WARN_ON(i == ARRAY_SIZE(drm_fmts)))
+ return;
+
+ ctrl = TXP_GO | TXP_VSTART_AT_EOF | TXP_EI |
+ VC4_SET_FIELD(0xf, TXP_BYTE_ENABLE) |
+ VC4_SET_FIELD(txp_fmts[i], TXP_FORMAT);
+
+ if (fb->format->has_alpha)
+ ctrl |= TXP_ALPHA_ENABLE;
+
+ gem = drm_fb_cma_get_gem_obj(fb, 0);
+ TXP_WRITE(TXP_DST_PTR, gem->paddr + fb->offsets[0]);
+ TXP_WRITE(TXP_DST_PITCH, fb->pitches[0]);
+ TXP_WRITE(TXP_DIM,
+ VC4_SET_FIELD(mode->hdisplay, TXP_WIDTH) |
+ VC4_SET_FIELD(mode->vdisplay, TXP_HEIGHT));
+
+ TXP_WRITE(TXP_DST_CTRL, ctrl);
+
+ drm_writeback_queue_job(&txp->connector, conn_state->writeback_job);
+}
+
+static const struct drm_connector_helper_funcs vc4_txp_connector_helper_funcs = {
+ .get_modes = vc4_txp_connector_get_modes,
+ .mode_valid = vc4_txp_connector_mode_valid,
+ .atomic_check = vc4_txp_connector_atomic_check,
+ .atomic_commit = vc4_txp_connector_atomic_commit,
+};
+
+static enum drm_connector_status
+vc4_txp_connector_detect(struct drm_connector *connector, bool force)
+{
+ return connector_status_connected;
+}
+
+static void vc4_txp_connector_destroy(struct drm_connector *connector)
+{
+ drm_connector_unregister(connector);
+ drm_connector_cleanup(connector);
+}
+
+static const struct drm_connector_funcs vc4_txp_connector_funcs = {
+ .detect = vc4_txp_connector_detect,
+ .fill_modes = drm_helper_probe_single_connector_modes,
+ .destroy = vc4_txp_connector_destroy,
+ .reset = drm_atomic_helper_connector_reset,
+ .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
+ .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
+};
+
+static void vc4_txp_encoder_disable(struct drm_encoder *encoder)
+{
+ struct vc4_txp *txp = encoder_to_vc4_txp(encoder);
+
+ if (TXP_READ(TXP_DST_CTRL) & TXP_BUSY) {
+ unsigned long timeout = jiffies + msecs_to_jiffies(1000);
+
+ TXP_WRITE(TXP_DST_CTRL, TXP_ABORT);
+
+ while (TXP_READ(TXP_DST_CTRL) & TXP_BUSY &&
+ time_before(jiffies, timeout))
+ ;
+
+ WARN_ON(TXP_READ(TXP_DST_CTRL) & TXP_BUSY);
+ }
+
+ TXP_WRITE(TXP_DST_CTRL, TXP_POWERDOWN);
+}
+
+static const struct drm_encoder_helper_funcs vc4_txp_encoder_helper_funcs = {
+ .disable = vc4_txp_encoder_disable,
+};
+
+static irqreturn_t vc4_txp_interrupt(int irq, void *data)
+{
+ struct vc4_txp *txp = data;
+
+ TXP_WRITE(TXP_DST_CTRL, TXP_READ(TXP_DST_CTRL) & ~TXP_EI);
+ vc4_crtc_handle_vblank(to_vc4_crtc(txp->connector.base.state->crtc));
+ drm_writeback_signal_completion(&txp->connector, 0);
+
+ return IRQ_HANDLED;
+}
+
+static int vc4_txp_bind(struct device *dev, struct device *master, void *data)
+{
+ struct platform_device *pdev = to_platform_device(dev);
+ struct drm_device *drm = dev_get_drvdata(master);
+ struct vc4_dev *vc4 = to_vc4_dev(drm);
+ struct vc4_txp *txp;
+ int ret, irq;
+
+ irq = platform_get_irq(pdev, 0);
+ if (irq < 0)
+ return irq;
+
+ txp = devm_kzalloc(dev, sizeof(*txp), GFP_KERNEL);
+ if (!txp)
+ return -ENOMEM;
+
+ txp->pdev = pdev;
+
+ txp->regs = vc4_ioremap_regs(pdev, 0);
+ if (IS_ERR(txp->regs))
+ return PTR_ERR(txp->regs);
+
+ drm_connector_helper_add(&txp->connector.base,
+ &vc4_txp_connector_helper_funcs);
+ ret = drm_writeback_connector_init(drm, &txp->connector,
+ &vc4_txp_connector_funcs,
+ &vc4_txp_encoder_helper_funcs,
+ drm_fmts, ARRAY_SIZE(drm_fmts));
+ if (ret)
+ return ret;
+
+ ret = devm_request_irq(dev, irq, vc4_txp_interrupt, 0,
+ dev_name(dev), txp);
+ if (ret)
+ return ret;
+
+ dev_set_drvdata(dev, txp);
+ vc4->txp = txp;
+
+ return 0;
+}
+
+static void vc4_txp_unbind(struct device *dev, struct device *master,
+ void *data)
+{
+ struct drm_device *drm = dev_get_drvdata(master);
+ struct vc4_dev *vc4 = to_vc4_dev(drm);
+ struct vc4_txp *txp = dev_get_drvdata(dev);
+
+ vc4_txp_connector_destroy(&txp->connector.base);
+
+ vc4->txp = NULL;
+}
+
+static const struct component_ops vc4_txp_ops = {
+ .bind = vc4_txp_bind,
+ .unbind = vc4_txp_unbind,
+};
+
+static int vc4_txp_probe(struct platform_device *pdev)
+{
+ return component_add(&pdev->dev, &vc4_txp_ops);
+}
+
+static int vc4_txp_remove(struct platform_device *pdev)
+{
+ component_del(&pdev->dev, &vc4_txp_ops);
+ return 0;
+}
+
+static const struct of_device_id vc4_txp_dt_match[] = {
+ { .compatible = "brcm,bcm2835-txp" },
+ { /* sentinel */ },
+};
+
+struct platform_driver vc4_txp_driver = {
+ .probe = vc4_txp_probe,
+ .remove = vc4_txp_remove,
+ .driver = {
+ .name = "vc4_txp",
+ .of_match_table = vc4_txp_dt_match,
+ },
+};