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Subject[PATCH 07/30] viafb: complete support for VX800/VX855 accelerated framebuffer
Date
This patch is a painful merge of change
a90bab567ece3e915d0ccd55ab00c9bb333fa8c0 (viafb: Add support for 2D
accelerated framebuffer on VX800/VX855) in the OLPC tree, originally by
Harald Welte. Harald's changelog read:

The VX800/VX820 and the VX855/VX875 chipsets have a different 2D
acceleration engine called "M1". The M1 engine has some subtle
(and some not-so-subtle) differences to the previous engines, so
support for accelerated framebuffer on those chipsets was disabled
so far.

This merge tries to preserve Harald's changes in the framework of the
much-changed 2.6.34 viafb code.

Cc: Florian Tobias Schandinat <FlorianSchandinat@gmx.de>
Cc: ScottFang@viatech.com.cn
Cc: JosephChan@via.com.tw
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
---
drivers/video/via/accel.c | 42 +++++++++++++++++++++++++++++++++---------
drivers/video/via/accel.h | 40 ++++++++++++++++++++++++++++++++++++++++
2 files changed, 73 insertions(+), 9 deletions(-)
diff --git a/drivers/video/via/accel.c b/drivers/video/via/accel.c
index 7c1d9c4..0d90c85 100644
--- a/drivers/video/via/accel.c
+++ b/drivers/video/via/accel.c
@@ -317,6 +317,7 @@ int viafb_init_engine(struct fb_info *info)
{
struct viafb_par *viapar = info->par;
void __iomem *engine;
+ int highest_reg, i;
u32 vq_start_addr, vq_end_addr, vq_start_low, vq_end_low, vq_high,
vq_len, chip_name = viapar->shared->chip_info.gfx_chip_name;

@@ -328,6 +329,18 @@ int viafb_init_engine(struct fb_info *info)
return -ENOMEM;
}

+ /* Initialize registers to reset the 2D engine */
+ switch (viapar->shared->chip_info.twod_engine) {
+ case VIA_2D_ENG_M1:
+ highest_reg = 0x5c;
+ break;
+ default:
+ highest_reg = 0x40;
+ break;
+ }
+ for (i = 0; i <= highest_reg; i += 4)
+ writel(0x0, engine + i);
+
switch (chip_name) {
case UNICHROME_CLE266:
case UNICHROME_K400:
@@ -357,13 +370,12 @@ int viafb_init_engine(struct fb_info *info)
viapar->shared->vq_vram_addr = viapar->fbmem_free;
viapar->fbmem_used += VQ_SIZE;

- /* Init 2D engine reg to reset 2D engine */
- writel(0x0, engine + VIA_REG_KEYCONTROL);
-
/* Init AGP and VQ regs */
switch (chip_name) {
case UNICHROME_K8M890:
case UNICHROME_P4M900:
+ case UNICHROME_VX800:
+ case UNICHROME_VX855:
writel(0x00100000, engine + VIA_REG_CR_TRANSET);
writel(0x680A0000, engine + VIA_REG_CR_TRANSPACE);
writel(0x02000000, engine + VIA_REG_CR_TRANSPACE);
@@ -398,6 +410,8 @@ int viafb_init_engine(struct fb_info *info)
switch (chip_name) {
case UNICHROME_K8M890:
case UNICHROME_P4M900:
+ case UNICHROME_VX800:
+ case UNICHROME_VX855:
vq_start_low |= 0x20000000;
vq_end_low |= 0x20000000;
vq_high |= 0x20000000;
@@ -475,15 +489,25 @@ void viafb_wait_engine_idle(struct fb_info *info)
{
struct viafb_par *viapar = info->par;
int loop = 0;
+ u32 mask;

- while (!(readl(viapar->shared->engine_mmio + VIA_REG_STATUS) &
- VIA_VR_QUEUE_BUSY) && (loop < MAXLOOP)) {
- loop++;
- cpu_relax();
+ switch (viapar->shared->chip_info.twod_engine) {
+ case VIA_2D_ENG_H5:
+ case VIA_2D_ENG_M1:
+ mask = VIA_CMD_RGTR_BUSY_M1 | VIA_2D_ENG_BUSY_M1 |
+ VIA_3D_ENG_BUSY_M1;
+ break;
+ default:
+ while (!(readl(viapar->shared->engine_mmio + VIA_REG_STATUS) &
+ VIA_VR_QUEUE_BUSY) && (loop < MAXLOOP)) {
+ loop++;
+ cpu_relax();
+ }
+ mask = VIA_CMD_RGTR_BUSY | VIA_2D_ENG_BUSY | VIA_3D_ENG_BUSY;
+ break;
}

- while ((readl(viapar->shared->engine_mmio + VIA_REG_STATUS) &
- (VIA_CMD_RGTR_BUSY | VIA_2D_ENG_BUSY | VIA_3D_ENG_BUSY)) &&
+ while ((readl(viapar->shared->engine_mmio + VIA_REG_STATUS) & mask) &&
(loop < MAXLOOP)) {
loop++;
cpu_relax();
diff --git a/drivers/video/via/accel.h b/drivers/video/via/accel.h
index 615c84a..2c122d2 100644
--- a/drivers/video/via/accel.h
+++ b/drivers/video/via/accel.h
@@ -67,6 +67,34 @@
/* from 0x100 to 0x1ff */
#define VIA_REG_COLORPAT 0x100

+/* defines for VIA 2D registers for vt3353/3409 (M1 engine)*/
+#define VIA_REG_GECMD_M1 0x000
+#define VIA_REG_GEMODE_M1 0x004
+#define VIA_REG_GESTATUS_M1 0x004 /* as same as VIA_REG_GEMODE */
+#define VIA_REG_PITCH_M1 0x008 /* pitch of src and dst */
+#define VIA_REG_DIMENSION_M1 0x00C /* width and height */
+#define VIA_REG_DSTPOS_M1 0x010
+#define VIA_REG_LINE_XY_M1 0x010
+#define VIA_REG_DSTBASE_M1 0x014
+#define VIA_REG_SRCPOS_M1 0x018
+#define VIA_REG_LINE_K1K2_M1 0x018
+#define VIA_REG_SRCBASE_M1 0x01C
+#define VIA_REG_PATADDR_M1 0x020
+#define VIA_REG_MONOPAT0_M1 0x024
+#define VIA_REG_MONOPAT1_M1 0x028
+#define VIA_REG_OFFSET_M1 0x02C
+#define VIA_REG_LINE_ERROR_M1 0x02C
+#define VIA_REG_CLIPTL_M1 0x040 /* top and left of clipping */
+#define VIA_REG_CLIPBR_M1 0x044 /* bottom and right of clipping */
+#define VIA_REG_KEYCONTROL_M1 0x048 /* color key control */
+#define VIA_REG_FGCOLOR_M1 0x04C
+#define VIA_REG_DSTCOLORKEY_M1 0x04C /* as same as VIA_REG_FG */
+#define VIA_REG_BGCOLOR_M1 0x050
+#define VIA_REG_SRCCOLORKEY_M1 0x050 /* as same as VIA_REG_BG */
+#define VIA_REG_MONOPATFGC_M1 0x058 /* Add BG color of Pattern. */
+#define VIA_REG_MONOPATBGC_M1 0x05C /* Add FG color of Pattern. */
+#define VIA_REG_COLORPAT_M1 0x100 /* from 0x100 to 0x1ff */
+
/* VIA_REG_PITCH(0x38): Pitch Setting */
#define VIA_PITCH_ENABLE 0x80000000

@@ -157,6 +185,18 @@
/* Virtual Queue is busy */
#define VIA_VR_QUEUE_BUSY 0x00020000

+/* VIA_REG_STATUS(0x400): Engine Status for H5 */
+#define VIA_CMD_RGTR_BUSY_H5 0x00000010 /* Command Regulator is busy */
+#define VIA_2D_ENG_BUSY_H5 0x00000002 /* 2D Engine is busy */
+#define VIA_3D_ENG_BUSY_H5 0x00001FE1 /* 3D Engine is busy */
+#define VIA_VR_QUEUE_BUSY_H5 0x00000004 /* Virtual Queue is busy */
+
+/* VIA_REG_STATUS(0x400): Engine Status for VT3353/3409 */
+#define VIA_CMD_RGTR_BUSY_M1 0x00000010 /* Command Regulator is busy */
+#define VIA_2D_ENG_BUSY_M1 0x00000002 /* 2D Engine is busy */
+#define VIA_3D_ENG_BUSY_M1 0x00001FE1 /* 3D Engine is busy */
+#define VIA_VR_QUEUE_BUSY_M1 0x00000004 /* Virtual Queue is busy */
+
#define MAXLOOP 0xFFFFFF

#define VIA_BITBLT_COLOR 1
--
1.7.0.1


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