--- /dev/null
+/*
+ * 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.
+ */
+
+/*#define DEBUG*/
+
+#include <linux/err.h>
+#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 <linux/platform_device.h>
+
+#include <video/omapvrfb.h>
+
+#ifdef DEBUG
+#define DBG(format, ...) pr_debug("VRFB: " format, ## __VA_ARGS__)
+#else
+#define DBG(format, ...)
+#endif
+
+#define SMS_ROT_CONTROL(context) (0x0 + 0x10 * context)
+#define SMS_ROT_SIZE(context) (0x4 + 0x10 * context)
+#define SMS_ROT_PHYSICAL_BA(context) (0x8 + 0x10 * context)
+#define SMS_ROT_VIRT_BASE(rot) (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
+
+/* bitmap of reserved contexts */
+static unsigned long ctx_map;
+
+struct vrfb_ctx {
+ u32 base;
+ u32 physical_ba;
+ u32 control;
+ u32 size;
+};
+
+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 void __iomem *vrfb_base;
+
+static int num_ctxs;
+static struct vrfb_ctx *ctxs;
+
+static bool vrfb_loaded;
+
+static void omap2_sms_write_rot_control(u32 val, unsigned ctx)
+{
+ __raw_writel(val, vrfb_base + SMS_ROT_CONTROL(ctx));
+}
+
+static void omap2_sms_write_rot_size(u32 val, unsigned ctx)
+{
+ __raw_writel(val, vrfb_base + SMS_ROT_SIZE(ctx));
+}
+
+static void omap2_sms_write_rot_physical_ba(u32 val, unsigned ctx)
+{
+ __raw_writel(val, vrfb_base + SMS_ROT_PHYSICAL_BA(ctx));
+}
+
+static inline void restore_hw_context(int ctx)
+{
+ omap2_sms_write_rot_control(ctxs[ctx].control, ctx);
+ omap2_sms_write_rot_size(ctxs[ctx].size, ctx);
+ omap2_sms_write_rot_physical_ba(ctxs[ctx].physical_ba, ctx);
+}
+
+static u32 get_image_width_roundup(u16 width, u8 bytespp)
+{
+ unsigned long stride = width * bytespp;
+ unsigned long ceil_pages_per_stride = (stride / VRFB_PAGE_WIDTH) +
+ (stride % VRFB_PAGE_WIDTH != 0);
+
+ return ceil_pages_per_stride * VRFB_PAGE_WIDTH / bytespp;
+}
+
+/*
+ * This the extra space needed in the VRFB physical area for VRFB to safely wrap
+ * any memory accesses to the invisible part of the virtual view to the physical
+ * area.
+ */
+static inline u32 get_extra_physical_size(u16 image_width_roundup, u8 bytespp)
+{
+ return (OMAP_VRFB_LINE_LEN - image_width_roundup) * VRFB_PAGE_HEIGHT *
+ bytespp;
+}
+
+void omap_vrfb_restore_context(void)
+{
+ int i;
+ unsigned long map = ctx_map;
+
+ 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);
+
+u32 omap_vrfb_min_phys_size(u16 width, u16 height, u8 bytespp)
+{
+ unsigned long image_width_roundup = get_image_width_roundup(width,
+ bytespp);
+
+ if (image_width_roundup > OMAP_VRFB_LINE_LEN)
+ return 0;
+
+ return (width * height * bytespp) + get_extra_physical_size(
+ image_width_roundup, bytespp);
+}
+EXPORT_SYMBOL(omap_vrfb_min_phys_size);
+
+u16 omap_vrfb_max_height(u32 phys_size, u16 width, u8 bytespp)
+{
+ unsigned long image_width_roundup = get_image_width_roundup(width,
+ bytespp);
+ unsigned long height;
+ unsigned long extra;
+
+ if (image_width_roundup > OMAP_VRFB_LINE_LEN)
+ return 0;
+
+ extra = get_extra_physical_size(image_width_roundup, bytespp);
+
+ if (phys_size < extra)
+ return 0;
+
+ height = (phys_size - extra) / (width * bytespp);
+
+ /* Virtual views provided by VRFB are limited to 2048x2048. */
+ return min_t(unsigned long, height, 2048);
+}
+EXPORT_SYMBOL(omap_vrfb_max_height);
+
+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, %d)\n", ctx, paddr,
+ width, height, bytespp, yuv_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();
+ return;
+ }
+
+ 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;
+
+ ctxs[ctx].physical_ba = paddr;
+ ctxs[ctx].size = size;
+ ctxs[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->xres = width;
+ vrfb->yres = height;
+ vrfb->xoffset = vrfb_width - width;
+ vrfb->yoffset = vrfb_height - height;
+ vrfb->bytespp = bytespp;
+ vrfb->yuv_mode = yuv_mode;
+}
+EXPORT_SYMBOL(omap_vrfb_setup);
+
+int omap_vrfb_map_angle(struct vrfb *vrfb, u16 height, u8 rot)
+{
+ unsigned long size = height * OMAP_VRFB_LINE_LEN * vrfb->bytespp;
+
+ vrfb->vaddr[rot] = ioremap_wc(vrfb->paddr[rot], size);
+
+ if (!vrfb->vaddr[rot]) {
+ printk(KERN_ERR "vrfb: ioremap failed\n");
+ return -ENOMEM;
+ }
+
+ DBG("ioremapped vrfb area %d of size %lu into %p\n", rot, size,
+ vrfb->vaddr[rot]);
+
+ return 0;
+}
+EXPORT_SYMBOL(omap_vrfb_map_angle);
+
+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);
+
+ 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 < num_ctxs; ++ctx)
+ if ((ctx_map & (1 << ctx)) == 0)
+ break;
+
+ if (ctx == 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);
+
+ memset(vrfb, 0, sizeof(*vrfb));
+
+ vrfb->context = ctx;
+
+ for (rot = 0; rot < 4; ++rot) {
+ paddr = ctxs[ctx].base + SMS_ROT_VIRT_BASE(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);
+
+bool omap_vrfb_supported(void)
+{
+ return vrfb_loaded;
+}
+EXPORT_SYMBOL(omap_vrfb_supported);
+
+static int __init vrfb_probe(struct platform_device *pdev)
+{
+ struct resource *mem;
+ int i;
+
+ /* first resource is the register res, the rest are vrfb contexts */
+
+ mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ vrfb_base = devm_ioremap_resource(&pdev->dev, mem);
+ if (IS_ERR(vrfb_base))
+ return PTR_ERR(vrfb_base);
+
+ num_ctxs = pdev->num_resources - 1;
+
+ ctxs = devm_kzalloc(&pdev->dev,
+ sizeof(struct vrfb_ctx) * num_ctxs,
+ GFP_KERNEL);
+
+ if (!ctxs)
+ return -ENOMEM;
+
+ for (i = 0; i < num_ctxs; ++i) {
+ mem = platform_get_resource(pdev, IORESOURCE_MEM, 1 + i);
+ if (!mem) {
+ dev_err(&pdev->dev, "can't get vrfb ctx %d address\n",
+ i);
+ return -EINVAL;
+ }
+
+ ctxs[i].base = mem->start;
+ }
+
+ vrfb_loaded = true;
+
+ return 0;
+}
+
+static void __exit vrfb_remove(struct platform_device *pdev)
+{
+ vrfb_loaded = false;
+}
+
+static struct platform_driver vrfb_driver = {
+ .driver.name = "omapvrfb",
+ .remove = __exit_p(vrfb_remove),
+};
+
+module_platform_driver_probe(vrfb_driver, vrfb_probe);
+
+MODULE_AUTHOR("Tomi Valkeinen <tomi.valkeinen@ti.com>");
+MODULE_DESCRIPTION("OMAP VRFB");
+MODULE_LICENSE("GPL v2");
Code Review / kvmfornfv.git / blobdiff