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Subject[PATCH 05/19] OMAP: Add support for VRFB rotation engine
Date
VRFB rotation engine is a block in OMAP2/3 that offers 12 independent
contexts that can be used for framebuffer rotation.

Each context has a backend area of real memory, where it stores the
pixels in undisclosed format. This memory is offered to users via 4
virtual memory areas, which see the same memory area in different
rotation angles (0, 90, 180 and 270 degrees).

Signed-off-by: Tomi Valkeinen <tomi.valkeinen@nokia.com>
---
arch/arm/plat-omap/include/mach/vrfb.h | 46 ++++++
drivers/video/omap2/Kconfig | 3 +
drivers/video/omap2/Makefile | 1 +
drivers/video/omap2/vrfb.c | 277 ++++++++++++++++++++++++++++++++
4 files changed, 327 insertions(+), 0 deletions(-)
create mode 100644 arch/arm/plat-omap/include/mach/vrfb.h
create mode 100644 drivers/video/omap2/vrfb.c
diff --git a/arch/arm/plat-omap/include/mach/vrfb.h b/arch/arm/plat-omap/include/mach/vrfb.h
new file mode 100644
index 0000000..8790612
--- /dev/null
+++ b/arch/arm/plat-omap/include/mach/vrfb.h
@@ -0,0 +1,46 @@
+/*
+ * VRFB Rotation Engine
+ *
+ * Copyright (C) 2009 Nokia Corporation
+ * Author: Tomi Valkeinen <tomi.valkeinen@nokia.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ */
+
+#ifndef __OMAP_VRFB_H__
+#define __OMAP_VRFB_H__
+
+#define OMAP_VRFB_LINE_LEN 2048
+
+struct vrfb {
+ u8 context;
+ void __iomem *vaddr[4];
+ unsigned long paddr[4];
+ u16 xoffset;
+ u16 yoffset;
+ u8 bytespp;
+};
+
+extern int omap_vrfb_request_ctx(struct vrfb *vrfb);
+extern void omap_vrfb_release_ctx(struct vrfb *vrfb);
+extern void omap_vrfb_suspend_ctx(struct vrfb *vrfb);
+extern void omap_vrfb_resume_ctx(struct vrfb *vrfb);
+extern void omap_vrfb_adjust_size(u16 *width, u16 *height,
+ u8 bytespp);
+extern void omap_vrfb_setup(struct vrfb *vrfb, unsigned long paddr,
+ u16 width, u16 height,
+ unsigned bytespp, bool yuv_mode);
+extern void omap_vrfb_restore_context(void);
+
+#endif /* __VRFB_H */
diff --git a/drivers/video/omap2/Kconfig b/drivers/video/omap2/Kconfig
index 7a6c4c9..ac8b650 100644
--- a/drivers/video/omap2/Kconfig
+++ b/drivers/video/omap2/Kconfig
@@ -1,2 +1,5 @@
config OMAP2_VRAM
bool
+
+config OMAP2_VRFB
+ bool
diff --git a/drivers/video/omap2/Makefile b/drivers/video/omap2/Makefile
index 7fdf7bd..aa3751b 100644
--- a/drivers/video/omap2/Makefile
+++ b/drivers/video/omap2/Makefile
@@ -1 +1,2 @@
obj-$(CONFIG_OMAP2_VRAM) += vram.o
+obj-$(CONFIG_OMAP2_VRFB) += vrfb.o
diff --git a/drivers/video/omap2/vrfb.c b/drivers/video/omap2/vrfb.c
new file mode 100644
index 0000000..8726689
--- /dev/null
+++ b/drivers/video/omap2/vrfb.c
@@ -0,0 +1,277 @@
+/*
+ * VRFB Rotation Engine
+ *
+ * Copyright (C) 2009 Nokia Corporation
+ * Author: Tomi Valkeinen <tomi.valkeinen@nokia.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/ioport.h>
+#include <linux/io.h>
+#include <linux/bitops.h>
+#include <linux/mutex.h>
+
+#include <mach/io.h>
+#include <mach/vrfb.h>
+#include <mach/sdrc.h>
+/*#define DEBUG*/
+
+#ifdef DEBUG
+#define DBG(format, ...) pr_debug("VRFB: " format, ## __VA_ARGS__)
+#else
+#define DBG(format, ...)
+#endif
+
+#define SMS_ROT_VIRT_BASE(context, rot) \
+ (((context >= 4) ? 0xD0000000 : 0x70000000) \
+ + (0x4000000 * (context)) \
+ + (0x1000000 * (rot)))
+
+#define OMAP_VRFB_SIZE (2048 * 2048 * 4)
+
+#define VRFB_PAGE_WIDTH_EXP 5 /* Assuming SDRAM pagesize= 1024 */
+#define VRFB_PAGE_HEIGHT_EXP 5 /* 1024 = 2^5 * 2^5 */
+#define VRFB_PAGE_WIDTH (1 << VRFB_PAGE_WIDTH_EXP)
+#define VRFB_PAGE_HEIGHT (1 << VRFB_PAGE_HEIGHT_EXP)
+#define SMS_IMAGEHEIGHT_OFFSET 16
+#define SMS_IMAGEWIDTH_OFFSET 0
+#define SMS_PH_OFFSET 8
+#define SMS_PW_OFFSET 4
+#define SMS_PS_OFFSET 0
+
+#define VRFB_NUM_CTXS 12
+/* bitmap of reserved contexts */
+static unsigned long ctx_map;
+/* bitmap of contexts for which we have to keep the HW context valid */
+static unsigned long ctx_map_active;
+
+static DEFINE_MUTEX(ctx_lock);
+
+/*
+ * Access to this happens from client drivers or the PM core after wake-up.
+ * For the first case we require locking at the driver level, for the second
+ * we don't need locking, since no drivers will run until after the wake-up
+ * has finished.
+ */
+static struct {
+ u32 physical_ba;
+ u32 control;
+ u32 size;
+} vrfb_hw_context[VRFB_NUM_CTXS];
+
+static inline void restore_hw_context(int ctx)
+{
+ omap2_sms_write_rot_control(vrfb_hw_context[ctx].control, ctx);
+ omap2_sms_write_rot_size(vrfb_hw_context[ctx].size, ctx);
+ omap2_sms_write_rot_physical_ba(vrfb_hw_context[ctx].physical_ba, ctx);
+}
+
+void omap_vrfb_restore_context(void)
+{
+ int i;
+ unsigned long map = ctx_map_active;
+
+ for (i = ffs(map); i; i = ffs(map)) {
+ /* i=1..32 */
+ i--;
+ map &= ~(1 << i);
+ restore_hw_context(i);
+ }
+}
+
+void omap_vrfb_adjust_size(u16 *width, u16 *height,
+ u8 bytespp)
+{
+ *width = ALIGN(*width * bytespp, VRFB_PAGE_WIDTH) / bytespp;
+ *height = ALIGN(*height, VRFB_PAGE_HEIGHT);
+}
+EXPORT_SYMBOL(omap_vrfb_adjust_size);
+
+void omap_vrfb_setup(struct vrfb *vrfb, unsigned long paddr,
+ u16 width, u16 height,
+ unsigned bytespp, bool yuv_mode)
+{
+ unsigned pixel_size_exp;
+ u16 vrfb_width;
+ u16 vrfb_height;
+ u8 ctx = vrfb->context;
+ u32 size;
+ u32 control;
+
+ DBG("omapfb_set_vrfb(%d, %lx, %dx%d, %d)\n", ctx, paddr,
+ width, height, color_mode);
+
+ /* For YUV2 and UYVY modes VRFB needs to handle pixels a bit
+ * differently. See TRM. */
+ if (yuv_mode) {
+ bytespp *= 2;
+ width /= 2;
+ }
+
+ if (bytespp == 4)
+ pixel_size_exp = 2;
+ else if (bytespp == 2)
+ pixel_size_exp = 1;
+ else
+ BUG();
+
+ vrfb_width = ALIGN(width * bytespp, VRFB_PAGE_WIDTH) / bytespp;
+ vrfb_height = ALIGN(height, VRFB_PAGE_HEIGHT);
+
+ DBG("vrfb w %u, h %u bytespp %d\n", vrfb_width, vrfb_height, bytespp);
+
+ size = vrfb_width << SMS_IMAGEWIDTH_OFFSET;
+ size |= vrfb_height << SMS_IMAGEHEIGHT_OFFSET;
+
+ control = pixel_size_exp << SMS_PS_OFFSET;
+ control |= VRFB_PAGE_WIDTH_EXP << SMS_PW_OFFSET;
+ control |= VRFB_PAGE_HEIGHT_EXP << SMS_PH_OFFSET;
+
+ vrfb_hw_context[ctx].physical_ba = paddr;
+ vrfb_hw_context[ctx].size = size;
+ vrfb_hw_context[ctx].control = control;
+
+ omap2_sms_write_rot_physical_ba(paddr, ctx);
+ omap2_sms_write_rot_size(size, ctx);
+ omap2_sms_write_rot_control(control, ctx);
+
+ DBG("vrfb offset pixels %d, %d\n",
+ vrfb_width - width, vrfb_height - height);
+
+ vrfb->xoffset = vrfb_width - width;
+ vrfb->yoffset = vrfb_height - height;
+ vrfb->bytespp = bytespp;
+}
+EXPORT_SYMBOL(omap_vrfb_setup);
+
+void omap_vrfb_release_ctx(struct vrfb *vrfb)
+{
+ int rot;
+ int ctx = vrfb->context;
+
+ if (ctx == 0xff)
+ return;
+
+ DBG("release ctx %d\n", ctx);
+
+ mutex_lock(&ctx_lock);
+
+ BUG_ON(!(ctx_map & (1 << ctx)));
+
+ clear_bit(ctx, &ctx_map_active);
+ clear_bit(ctx, &ctx_map);
+
+ for (rot = 0; rot < 4; ++rot) {
+ if (vrfb->paddr[rot]) {
+ release_mem_region(vrfb->paddr[rot], OMAP_VRFB_SIZE);
+ vrfb->paddr[rot] = 0;
+ }
+ }
+
+ vrfb->context = 0xff;
+
+ mutex_unlock(&ctx_lock);
+}
+EXPORT_SYMBOL(omap_vrfb_release_ctx);
+
+int omap_vrfb_request_ctx(struct vrfb *vrfb)
+{
+ int rot;
+ u32 paddr;
+ u8 ctx;
+ int r;
+
+ DBG("request ctx\n");
+
+ mutex_lock(&ctx_lock);
+
+ for (ctx = 0; ctx < VRFB_NUM_CTXS; ++ctx)
+ if ((ctx_map & (1 << ctx)) == 0)
+ break;
+
+ if (ctx == VRFB_NUM_CTXS) {
+ pr_err("vrfb: no free contexts\n");
+ r = -EBUSY;
+ goto out;
+ }
+
+ DBG("found free ctx %d\n", ctx);
+
+ set_bit(ctx, &ctx_map);
+ WARN_ON(ctx_map_active & (1 << ctx));
+ set_bit(ctx, &ctx_map_active);
+
+ memset(vrfb, 0, sizeof(*vrfb));
+
+ vrfb->context = ctx;
+
+ for (rot = 0; rot < 4; ++rot) {
+ paddr = SMS_ROT_VIRT_BASE(ctx, rot);
+ if (!request_mem_region(paddr, OMAP_VRFB_SIZE, "vrfb")) {
+ pr_err("vrfb: failed to reserve VRFB "
+ "area for ctx %d, rotation %d\n",
+ ctx, rot * 90);
+ omap_vrfb_release_ctx(vrfb);
+ r = -ENOMEM;
+ goto out;
+ }
+
+ vrfb->paddr[rot] = paddr;
+
+ DBG("VRFB %d/%d: %lx\n", ctx, rot*90, vrfb->paddr[rot]);
+ }
+
+ r = 0;
+out:
+ mutex_unlock(&ctx_lock);
+ return r;
+}
+EXPORT_SYMBOL(omap_vrfb_request_ctx);
+
+void omap_vrfb_suspend_ctx(struct vrfb *vrfb)
+{
+ DBG("suspend ctx %d\n", vrfb->context);
+ mutex_lock(&ctx_lock);
+
+ BUG_ON(vrfb->context >= VRFB_NUM_CTXS);
+ BUG_ON(!((1 << vrfb->context) & ctx_map_active));
+
+ clear_bit(vrfb->context, &ctx_map_active);
+ mutex_unlock(&ctx_lock);
+}
+EXPORT_SYMBOL(omap_vrfb_suspend_ctx);
+
+void omap_vrfb_resume_ctx(struct vrfb *vrfb)
+{
+ DBG("resume ctx %d\n", vrfb->context);
+ mutex_lock(&ctx_lock);
+
+ BUG_ON(vrfb->context >= VRFB_NUM_CTXS);
+ BUG_ON((1 << vrfb->context) & ctx_map_active);
+
+ /*
+ * omap_vrfb_restore_context is normally called by the core domain
+ * save / restore logic, but since this VRFB context was suspended
+ * those calls didn't actually restore the context and now we might
+ * have an invalid context. Do an explicit restore here.
+ */
+ restore_hw_context(vrfb->context);
+ set_bit(vrfb->context, &ctx_map_active);
+ mutex_unlock(&ctx_lock);
+}
+EXPORT_SYMBOL(omap_vrfb_resume_ctx);
+
--
1.6.4


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