1 files changed, 414 insertions, 0 deletions

diff --git a/drivers/gpu/drm/udl/udl_modeset.c b/drivers/gpu/drm/udl/udl_modeset.c
new file mode 100644
index 000000000000..b3ecb3d12a1d
--- /dev/null
+++ b/drivers/gpu/drm/udl/udl_modeset.c
@@ -0,0 +1,414 @@
+/*
+ * Copyright (C) 2012 Red Hat
+ *
+ * based in parts on udlfb.c:
+ * Copyright (C) 2009 Roberto De Ioris <roberto@unbit.it>
+ * Copyright (C) 2009 Jaya Kumar <jayakumar.lkml@gmail.com>
+ * Copyright (C) 2009 Bernie Thompson <bernie@plugable.com>
+
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License v2. See the file COPYING in the main directory of this archive for
+ * more details.
+ */
+
+#include "drmP.h"
+#include "drm_crtc.h"
+#include "drm_crtc_helper.h"
+#include "udl_drv.h"
+
+/*
+ * All DisplayLink bulk operations start with 0xAF, followed by specific code
+ * All operations are written to buffers which then later get sent to device
+ */
+static char *udl_set_register(char *buf, u8 reg, u8 val)
+{
+        *buf++ = 0xAF;
+        *buf++ = 0x20;
+        *buf++ = reg;
+        *buf++ = val;
+        return buf;
+}
+
+static char *udl_vidreg_lock(char *buf)
+{
+        return udl_set_register(buf, 0xFF, 0x00);
+}
+
+static char *udl_vidreg_unlock(char *buf)
+{
+        return udl_set_register(buf, 0xFF, 0xFF);
+}
+
+/*
+ * On/Off for driving the DisplayLink framebuffer to the display
+ *  0x00 H and V sync on
+ *  0x01 H and V sync off (screen blank but powered)
+ *  0x07 DPMS powerdown (requires modeset to come back)
+ */
+static char *udl_enable_hvsync(char *buf, bool enable)
+{
+        if (enable)
+                return udl_set_register(buf, 0x1F, 0x00);
+        else
+                return udl_set_register(buf, 0x1F, 0x07);
+}
+
+static char *udl_set_color_depth(char *buf, u8 selection)
+{
+        return udl_set_register(buf, 0x00, selection);
+}
+
+static char *udl_set_base16bpp(char *wrptr, u32 base)
+{
+        /* the base pointer is 16 bits wide, 0x20 is hi byte. */
+        wrptr = udl_set_register(wrptr, 0x20, base >> 16);
+        wrptr = udl_set_register(wrptr, 0x21, base >> 8);
+        return udl_set_register(wrptr, 0x22, base);
+}
+
+/*
+ * DisplayLink HW has separate 16bpp and 8bpp framebuffers.
+ * In 24bpp modes, the low 323 RGB bits go in the 8bpp framebuffer
+ */
+static char *udl_set_base8bpp(char *wrptr, u32 base)
+{
+        wrptr = udl_set_register(wrptr, 0x26, base >> 16);
+        wrptr = udl_set_register(wrptr, 0x27, base >> 8);
+        return udl_set_register(wrptr, 0x28, base);
+}
+
+static char *udl_set_register_16(char *wrptr, u8 reg, u16 value)
+{
+        wrptr = udl_set_register(wrptr, reg, value >> 8);
+        return udl_set_register(wrptr, reg+1, value);
+}
+
+/*
+ * This is kind of weird because the controller takes some
+ * register values in a different byte order than other registers.
+ */
+static char *udl_set_register_16be(char *wrptr, u8 reg, u16 value)
+{
+        wrptr = udl_set_register(wrptr, reg, value);
+        return udl_set_register(wrptr, reg+1, value >> 8);
+}
+
+/*
+ * LFSR is linear feedback shift register. The reason we have this is
+ * because the display controller needs to minimize the clock depth of
+ * various counters used in the display path. So this code reverses the
+ * provided value into the lfsr16 value by counting backwards to get
+ * the value that needs to be set in the hardware comparator to get the
+ * same actual count. This makes sense once you read above a couple of
+ * times and think about it from a hardware perspective.
+ */
+static u16 udl_lfsr16(u16 actual_count)
+{
+        u32 lv = 0xFFFF; /* This is the lfsr value that the hw starts with */
+
+        while (actual_count--) {
+                lv =     ((lv << 1) |
+                        (((lv >> 15) ^ (lv >> 4) ^ (lv >> 2) ^ (lv >> 1)) & 1))
+                        & 0xFFFF;
+        }
+
+        return (u16) lv;
+}
+
+/*
+ * This does LFSR conversion on the value that is to be written.
+ * See LFSR explanation above for more detail.
+ */
+static char *udl_set_register_lfsr16(char *wrptr, u8 reg, u16 value)
+{
+        return udl_set_register_16(wrptr, reg, udl_lfsr16(value));
+}
+
+/*
+ * This takes a standard fbdev screeninfo struct and all of its monitor mode
+ * details and converts them into the DisplayLink equivalent register commands.
+  ERR(vreg(dev,               0x00, (color_depth == 16) ? 0 : 1));
+  ERR(vreg_lfsr16(dev,        0x01, xDisplayStart));
+  ERR(vreg_lfsr16(dev,        0x03, xDisplayEnd));
+  ERR(vreg_lfsr16(dev,        0x05, yDisplayStart));
+  ERR(vreg_lfsr16(dev,        0x07, yDisplayEnd));
+  ERR(vreg_lfsr16(dev,        0x09, xEndCount));
+  ERR(vreg_lfsr16(dev,        0x0B, hSyncStart));
+  ERR(vreg_lfsr16(dev,        0x0D, hSyncEnd));
+  ERR(vreg_big_endian(dev,    0x0F, hPixels));
+  ERR(vreg_lfsr16(dev,        0x11, yEndCount));
+  ERR(vreg_lfsr16(dev,        0x13, vSyncStart));
+  ERR(vreg_lfsr16(dev,        0x15, vSyncEnd));
+  ERR(vreg_big_endian(dev,    0x17, vPixels));
+  ERR(vreg_little_endian(dev, 0x1B, pixelClock5KHz));
+
+  ERR(vreg(dev,               0x1F, 0));
+
+  ERR(vbuf(dev, WRITE_VIDREG_UNLOCK, DSIZEOF(WRITE_VIDREG_UNLOCK)));
+ */
+static char *udl_set_vid_cmds(char *wrptr, struct drm_display_mode *mode)
+{
+        u16 xds, yds;
+        u16 xde, yde;
+        u16 yec;
+
+        /* x display start */
+        xds = mode->crtc_htotal - mode->crtc_hsync_start;
+        wrptr = udl_set_register_lfsr16(wrptr, 0x01, xds);
+        /* x display end */
+        xde = xds + mode->crtc_hdisplay;
+        wrptr = udl_set_register_lfsr16(wrptr, 0x03, xde);
+
+        /* y display start */
+        yds = mode->crtc_vtotal - mode->crtc_vsync_start;
+        wrptr = udl_set_register_lfsr16(wrptr, 0x05, yds);
+        /* y display end */
+        yde = yds + mode->crtc_vdisplay;
+        wrptr = udl_set_register_lfsr16(wrptr, 0x07, yde);
+
+        /* x end count is active + blanking - 1 */
+        wrptr = udl_set_register_lfsr16(wrptr, 0x09,
+                                        mode->crtc_htotal - 1);
+
+        /* libdlo hardcodes hsync start to 1 */
+        wrptr = udl_set_register_lfsr16(wrptr, 0x0B, 1);
+
+        /* hsync end is width of sync pulse + 1 */
+        wrptr = udl_set_register_lfsr16(wrptr, 0x0D,
+                                        mode->crtc_hsync_end - mode->crtc_hsync_start + 1);
+
+        /* hpixels is active pixels */
+        wrptr = udl_set_register_16(wrptr, 0x0F, mode->hdisplay);
+
+        /* yendcount is vertical active + vertical blanking */
+        yec = mode->crtc_vtotal;
+        wrptr = udl_set_register_lfsr16(wrptr, 0x11, yec);
+
+        /* libdlo hardcodes vsync start to 0 */
+        wrptr = udl_set_register_lfsr16(wrptr, 0x13, 0);
+
+        /* vsync end is width of vsync pulse */
+        wrptr = udl_set_register_lfsr16(wrptr, 0x15, mode->crtc_vsync_end - mode->crtc_vsync_start);
+
+        /* vpixels is active pixels */
+        wrptr = udl_set_register_16(wrptr, 0x17, mode->crtc_vdisplay);
+
+        wrptr = udl_set_register_16be(wrptr, 0x1B,
+                                      mode->clock / 5);
+
+        return wrptr;
+}
+
+static int udl_crtc_write_mode_to_hw(struct drm_crtc *crtc)
+{
+        struct drm_device *dev = crtc->dev;
+        struct udl_device *udl = dev->dev_private;
+        struct urb *urb;
+        char *buf;
+        int retval;
+
+        urb = udl_get_urb(dev);
+        if (!urb)
+                return -ENOMEM;
+
+        buf = (char *)urb->transfer_buffer;
+
+        memcpy(buf, udl->mode_buf, udl->mode_buf_len);
+        retval = udl_submit_urb(dev, urb, udl->mode_buf_len);
+        DRM_INFO("write mode info %d\n", udl->mode_buf_len);
+        return retval;
+}
+
+
+static void udl_crtc_dpms(struct drm_crtc *crtc, int mode)
+{
+        struct drm_device *dev = crtc->dev;
+        struct udl_device *udl = dev->dev_private;
+        int retval;
+
+        if (mode == DRM_MODE_DPMS_OFF) {
+                char *buf;
+                struct urb *urb;
+                urb = udl_get_urb(dev);
+                if (!urb)
+                        return;
+
+                buf = (char *)urb->transfer_buffer;
+                buf = udl_vidreg_lock(buf);
+                buf = udl_enable_hvsync(buf, false);
+                buf = udl_vidreg_unlock(buf);
+
+                retval = udl_submit_urb(dev, urb, buf - (char *)
+                                        urb->transfer_buffer);
+        } else {
+                if (udl->mode_buf_len == 0) {
+                        DRM_ERROR("Trying to enable DPMS with no mode\n");
+                        return;
+                }
+                udl_crtc_write_mode_to_hw(crtc);
+        }
+
+}
+
+static bool udl_crtc_mode_fixup(struct drm_crtc *crtc,
+                                  struct drm_display_mode *mode,
+                                  struct drm_display_mode *adjusted_mode)
+
+{
+        return true;
+}
+
+#if 0
+static int
+udl_pipe_set_base_atomic(struct drm_crtc *crtc, struct drm_framebuffer *fb,
+                           int x, int y, enum mode_set_atomic state)
+{
+        return 0;
+}
+
+static int
+udl_pipe_set_base(struct drm_crtc *crtc, int x, int y,
+                    struct drm_framebuffer *old_fb)
+{
+        return 0;
+}
+#endif
+
+static int udl_crtc_mode_set(struct drm_crtc *crtc,
+                               struct drm_display_mode *mode,
+                               struct drm_display_mode *adjusted_mode,
+                               int x, int y,
+                               struct drm_framebuffer *old_fb)
+
+{
+        struct drm_device *dev = crtc->dev;
+        struct udl_framebuffer *ufb = to_udl_fb(crtc->fb);
+        struct udl_device *udl = dev->dev_private;
+        char *buf;
+        char *wrptr;
+        int color_depth = 0;
+
+        buf = (char *)udl->mode_buf;
+
+        /* for now we just clip 24 -> 16 - if we fix that fix this */
+        /*if  (crtc->fb->bits_per_pixel != 16)
+          color_depth = 1; */
+
+        /* This first section has to do with setting the base address on the
+        * controller * associated with the display. There are 2 base
+        * pointers, currently, we only * use the 16 bpp segment.
+        */
+        wrptr = udl_vidreg_lock(buf);
+        wrptr = udl_set_color_depth(wrptr, color_depth);
+        /* set base for 16bpp segment to 0 */
+        wrptr = udl_set_base16bpp(wrptr, 0);
+        /* set base for 8bpp segment to end of fb */
+        wrptr = udl_set_base8bpp(wrptr, 2 * mode->vdisplay * mode->hdisplay);
+
+        wrptr = udl_set_vid_cmds(wrptr, adjusted_mode);
+        wrptr = udl_enable_hvsync(wrptr, true);
+        wrptr = udl_vidreg_unlock(wrptr);
+
+        ufb->active_16 = true;
+        if (old_fb) {
+                struct udl_framebuffer *uold_fb = to_udl_fb(old_fb);
+                uold_fb->active_16 = false;
+        }
+        udl->mode_buf_len = wrptr - buf;
+
+        /* damage all of it */
+        udl_handle_damage(ufb, 0, 0, ufb->base.width, ufb->base.height);
+        return 0;
+}
+
+
+static void udl_crtc_disable(struct drm_crtc *crtc)
+{
+
+
+}
+
+static void udl_crtc_destroy(struct drm_crtc *crtc)
+{
+        drm_crtc_cleanup(crtc);
+        kfree(crtc);
+}
+
+static void udl_load_lut(struct drm_crtc *crtc)
+{
+}
+
+static void udl_crtc_prepare(struct drm_crtc *crtc)
+{
+}
+
+static void udl_crtc_commit(struct drm_crtc *crtc)
+{
+        udl_crtc_dpms(crtc, DRM_MODE_DPMS_ON);
+}
+
+static struct drm_crtc_helper_funcs udl_helper_funcs = {
+        .dpms = udl_crtc_dpms,
+        .mode_fixup = udl_crtc_mode_fixup,
+        .mode_set = udl_crtc_mode_set,
+        .prepare = udl_crtc_prepare,
+        .commit = udl_crtc_commit,
+        .disable = udl_crtc_disable,
+        .load_lut = udl_load_lut,
+};
+
+static const struct drm_crtc_funcs udl_crtc_funcs = {
+        .set_config = drm_crtc_helper_set_config,
+        .destroy = udl_crtc_destroy,
+};
+
+int udl_crtc_init(struct drm_device *dev)
+{
+        struct drm_crtc *crtc;
+
+        crtc = kzalloc(sizeof(struct drm_crtc) + sizeof(struct drm_connector *), GFP_KERNEL);
+        if (crtc == NULL)
+                return -ENOMEM;
+
+        drm_crtc_init(dev, crtc, &udl_crtc_funcs);
+        drm_crtc_helper_add(crtc, &udl_helper_funcs);
+
+        return 0;
+}
+
+static const struct drm_mode_config_funcs udl_mode_funcs = {
+        .fb_create = udl_fb_user_fb_create,
+        .output_poll_changed = NULL,
+};
+
+int udl_modeset_init(struct drm_device *dev)
+{
+        struct drm_encoder *encoder;
+        drm_mode_config_init(dev);
+
+        dev->mode_config.min_width = 640;
+        dev->mode_config.min_height = 480;
+
+        dev->mode_config.max_width = 2048;
+        dev->mode_config.max_height = 2048;
+
+        dev->mode_config.prefer_shadow = 0;
+        dev->mode_config.preferred_depth = 24;
+
+        dev->mode_config.funcs = (void *)&udl_mode_funcs;
+
+        drm_mode_create_dirty_info_property(dev);
+
+        udl_crtc_init(dev);
+
+        encoder = udl_encoder_init(dev);
+
+        udl_connector_init(dev, encoder);
+
+        return 0;
+}
+
+void udl_modeset_cleanup(struct drm_device *dev)
+{
+        drm_mode_config_cleanup(dev);
+}