openwrt/target/linux/brcm2708/patches-4.1/0137-fbdev-bcm2708-Use-firmware-API.patch

From f220fe12bab49d45cde9e00cd4aaf2f9bbc5ff5f Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Noralf=20Tr=C3=B8nnes?= <noralf@tronnes.org>
Date: Mon, 20 Jul 2015 12:20:59 +0200
Subject: [PATCH 137/171] fbdev: bcm2708: Use firmware API
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

Use the new firmware API instead of the legacy mailbox API.

Signed-off-by: Noralf Trønnes <noralf@tronnes.org>
---
 arch/arm/boot/dts/bcm2708_common.dtsi |   1 +
 drivers/video/fbdev/bcm2708_fb.c      | 273 +++++++++++++++++++---------------
 2 files changed, 152 insertions(+), 122 deletions(-)

--- a/arch/arm/boot/dts/bcm2708_common.dtsi
+++ b/arch/arm/boot/dts/bcm2708_common.dtsi
@@ -217,6 +217,7 @@
 
 		fb: fb {
 			compatible = "brcm,bcm2708-fb";
+			firmware = <&firmware>;
 			status = "disabled";
 		};
 
--- a/drivers/video/fbdev/bcm2708_fb.c
+++ b/drivers/video/fbdev/bcm2708_fb.c
@@ -25,7 +25,6 @@
 #include <linux/ioport.h>
 #include <linux/list.h>
 #include <linux/platform_data/dma-bcm2708.h>
-#include <linux/platform_data/mailbox-bcm2708.h>
 #include <linux/platform_device.h>
 #include <linux/clk.h>
 #include <linux/printk.h>
@@ -34,6 +33,7 @@
 #include <asm/sizes.h>
 #include <linux/io.h>
 #include <linux/dma-mapping.h>
+#include <soc/bcm2835/raspberrypi-firmware.h>
 
 //#define BCM2708_FB_DEBUG
 #define MODULE_NAME "bcm2708_fb"
@@ -58,15 +58,19 @@ static u32 dma_busy_wait_threshold = 1<<
 module_param(dma_busy_wait_threshold, int, 0644);
 MODULE_PARM_DESC(dma_busy_wait_threshold, "Busy-wait for DMA completion below this area");
 
-/* this data structure describes each frame buffer device we find */
-
-struct fbinfo_s {
-	u32 xres, yres, xres_virtual, yres_virtual;
-	u32 pitch, bpp;
+struct fb_alloc_tags {
+	struct rpi_firmware_property_tag_header tag1;
+	u32 xres, yres;
+	struct rpi_firmware_property_tag_header tag2;
+	u32 xres_virtual, yres_virtual;
+	struct rpi_firmware_property_tag_header tag3;
+	u32 bpp;
+	struct rpi_firmware_property_tag_header tag4;
 	u32 xoffset, yoffset;
-	u32 base;
-	u32 screen_size;
-	u16 cmap[256];
+	struct rpi_firmware_property_tag_header tag5;
+	u32 base, screen_size;
+	struct rpi_firmware_property_tag_header tag6;
+	u32 pitch;
 };
 
 struct bcm2708_fb_stats {
@@ -78,9 +82,9 @@ struct bcm2708_fb_stats {
 struct bcm2708_fb {
 	struct fb_info fb;
 	struct platform_device *dev;
-	struct fbinfo_s *info;
-	dma_addr_t dma;
+	struct rpi_firmware *fw;
 	u32 cmap[16];
+	u32 gpu_cmap[256];
 	int dma_chan;
 	int dma_irq;
 	void __iomem *dma_chan_base;
@@ -270,69 +274,71 @@ static int bcm2708_fb_check_var(struct f
 
 static int bcm2708_fb_set_par(struct fb_info *info)
 {
-	uint32_t val = 0;
 	struct bcm2708_fb *fb = to_bcm2708(info);
-	volatile struct fbinfo_s *fbinfo = fb->info;
-	fbinfo->xres = info->var.xres;
-	fbinfo->yres = info->var.yres;
-	fbinfo->xres_virtual = info->var.xres_virtual;
-	fbinfo->yres_virtual = info->var.yres_virtual;
-	fbinfo->bpp = info->var.bits_per_pixel;
-	fbinfo->xoffset = info->var.xoffset;
-	fbinfo->yoffset = info->var.yoffset;
-	fbinfo->base = 0;	/* filled in by VC */
-	fbinfo->pitch = 0;	/* filled in by VC */
+	struct fb_alloc_tags fbinfo = {
+		.tag1 = { RPI_FIRMWARE_FRAMEBUFFER_SET_PHYSICAL_WIDTH_HEIGHT,
+			  8, 0, },
+			.xres = info->var.xres,
+			.yres = info->var.yres,
+		.tag2 = { RPI_FIRMWARE_FRAMEBUFFER_SET_VIRTUAL_WIDTH_HEIGHT,
+			  8, 0, },
+			.xres_virtual = info->var.xres_virtual,
+			.yres_virtual = info->var.yres_virtual,
+		.tag3 = { RPI_FIRMWARE_FRAMEBUFFER_SET_DEPTH, 4, 0 },
+			.bpp = info->var.bits_per_pixel,
+		.tag4 = { RPI_FIRMWARE_FRAMEBUFFER_SET_VIRTUAL_OFFSET, 8, 0 },
+			.xoffset = info->var.xoffset,
+			.yoffset = info->var.yoffset,
+		.tag5 = { RPI_FIRMWARE_FRAMEBUFFER_ALLOCATE, 8, 0 },
+			.base = 0,
+			.screen_size = 0,
+		.tag6 = { RPI_FIRMWARE_FRAMEBUFFER_GET_PITCH, 4, 0 },
+			.pitch = 0,
+	};
+	int ret;
 
 	print_debug("bcm2708_fb_set_par info(%p) %dx%d (%dx%d), %d, %d\n", info,
 		info->var.xres, info->var.yres, info->var.xres_virtual,
 		info->var.yres_virtual, (int)info->screen_size,
 		info->var.bits_per_pixel);
 
-	/* ensure last write to fbinfo is visible to GPU */
-	wmb();
-
-	/* inform vc about new framebuffer */
-	bcm_mailbox_write(MBOX_CHAN_FB, fb->dma);
+	ret = rpi_firmware_property_list(fb->fw, &fbinfo, sizeof(fbinfo));
+	if (ret) {
+		dev_err(info->device,
+			"Failed to allocate GPU framebuffer (%d)\n", ret);
+		return ret;
+	}
 
-	/* TODO: replace fb driver with vchiq version */
-	/* wait for response */
-	bcm_mailbox_read(MBOX_CHAN_FB, &val);
-
-	/* ensure GPU writes are visible to us */
-	rmb();
-
-        if (val == 0) {
-		fb->fb.fix.line_length = fbinfo->pitch;
-
-		if (info->var.bits_per_pixel <= 8)
-			fb->fb.fix.visual = FB_VISUAL_PSEUDOCOLOR;
-		else
-			fb->fb.fix.visual = FB_VISUAL_TRUECOLOR;
-
-		fb->fb_bus_address = fbinfo->base;
-		fbinfo->base &= ~0xc0000000;
-		fb->fb.fix.smem_start = fbinfo->base;
-		fb->fb.fix.smem_len = fbinfo->pitch * fbinfo->yres_virtual;
-		fb->fb.screen_size = fbinfo->screen_size;
-		if (fb->fb.screen_base)
-			iounmap(fb->fb.screen_base);
-		fb->fb.screen_base =
-			(void *)ioremap_wc(fbinfo->base, fb->fb.screen_size);
-		if (!fb->fb.screen_base) {
-			/* the console may currently be locked */
-			console_trylock();
-			console_unlock();
-			pr_err("bcm2708_fb_set_par: Failed to set screen_base\n");
-			return -EIO;
-		}
+	if (info->var.bits_per_pixel <= 8)
+		fb->fb.fix.visual = FB_VISUAL_PSEUDOCOLOR;
+	else
+		fb->fb.fix.visual = FB_VISUAL_TRUECOLOR;
+
+	fb->fb.fix.line_length = fbinfo.pitch;
+	fbinfo.base |= 0x40000000;
+	fb->fb_bus_address = fbinfo.base;
+	fbinfo.base &= ~0xc0000000;
+	fb->fb.fix.smem_start = fbinfo.base;
+	fb->fb.fix.smem_len = fbinfo.pitch * fbinfo.yres_virtual;
+	fb->fb.screen_size = fbinfo.screen_size;
+	if (fb->fb.screen_base)
+		iounmap(fb->fb.screen_base);
+	fb->fb.screen_base = ioremap_wc(fbinfo.base, fb->fb.screen_size);
+	if (!fb->fb.screen_base) {
+		/* the console may currently be locked */
+		console_trylock();
+		console_unlock();
+		dev_err(info->device, "Failed to set screen_base\n");
+		return -ENOMEM;
 	}
+
 	print_debug
-	    ("BCM2708FB: start = %p,%p width=%d, height=%d, bpp=%d, pitch=%d size=%d success=%d\n",
+	    ("BCM2708FB: start = %p,%p width=%d, height=%d, bpp=%d, pitch=%d size=%d\n",
 	     (void *)fb->fb.screen_base, (void *)fb->fb_bus_address,
-	     fbinfo->xres, fbinfo->yres, fbinfo->bpp,
-	     fbinfo->pitch, (int)fb->fb.screen_size, val);
+	     fbinfo.xres, fbinfo.yres, fbinfo.bpp,
+	     fbinfo.pitch, (int)fb->fb.screen_size);
 
-	return val;
+	return 0;
 }
 
 static inline u32 convert_bitfield(int val, struct fb_bitfield *bf)
@@ -352,15 +358,34 @@ static int bcm2708_fb_setcolreg(unsigned
 	/*print_debug("BCM2708FB: setcolreg %d:(%02x,%02x,%02x,%02x) %x\n", regno, red, green, blue, transp, fb->fb.fix.visual);*/
 	if (fb->fb.var.bits_per_pixel <= 8) {
 		if (regno < 256) {
-			/* blue [0:4], green [5:10], red [11:15] */
-			fb->info->cmap[regno] = ((red   >> (16-5)) & 0x1f) << 11 |
-						((green >> (16-6)) & 0x3f) << 5 |
-						((blue  >> (16-5)) & 0x1f) << 0;
+			/* blue [23:16], green [15:8], red [7:0] */
+			fb->gpu_cmap[regno] = ((red   >> 8) & 0xff) << 0 |
+					      ((green >> 8) & 0xff) << 8 |
+					      ((blue  >> 8) & 0xff) << 16;
 		}
 		/* Hack: we need to tell GPU the palette has changed, but currently bcm2708_fb_set_par takes noticable time when called for every (256) colour */
 		/* So just call it for what looks like the last colour in a list for now. */
-		if (regno == 15 || regno == 255)
-			bcm2708_fb_set_par(info);
+		if (regno == 15 || regno == 255) {
+			struct packet {
+				u32 offset;
+				u32 length;
+				u32 cmap[256];
+			} *packet;
+			int ret;
+
+			packet = kmalloc(sizeof(*packet), GFP_KERNEL);
+			if (!packet)
+				return -ENOMEM;
+			packet->offset = 0;
+			packet->length = regno + 1;
+			memcpy(packet->cmap, fb->gpu_cmap, sizeof(packet->cmap));
+			ret = rpi_firmware_property(fb->fw, RPI_FIRMWARE_FRAMEBUFFER_SET_PALETTE,
+						    packet, (2 + packet->length) * sizeof(u32));
+			if (ret || packet->offset)
+				dev_err(info->device, "Failed to set palette (%d,%u)\n",
+					ret, packet->offset);
+			kfree(packet);
+		}
         } else if (regno < 16) {
 		fb->cmap[regno] = convert_bitfield(transp, &fb->fb.var.transp) |
 		    convert_bitfield(blue, &fb->fb.var.blue) |
@@ -372,27 +397,31 @@ static int bcm2708_fb_setcolreg(unsigned
 
 static int bcm2708_fb_blank(int blank_mode, struct fb_info *info)
 {
-	s32 result = -1;
-	u32 p[7];
-	if ( 	(blank_mode == FB_BLANK_NORMAL) ||
-		(blank_mode == FB_BLANK_UNBLANK)) {
-
-		p[0] = 28; //  size = sizeof u32 * length of p
-		p[1] = VCMSG_PROCESS_REQUEST; // process request
-		p[2] = VCMSG_SET_BLANK_SCREEN; // (the tag id)
-		p[3] = 4; // (size of the response buffer)
-		p[4] = 4; // (size of the request data)
-		p[5] = blank_mode;
-		p[6] = VCMSG_PROPERTY_END; // end tag
-
-		bcm_mailbox_property(&p, p[0]);
-
-		if ( p[1] == VCMSG_REQUEST_SUCCESSFUL )
-			result = 0;
-		else
-			pr_err("bcm2708_fb_blank(%d) returns=%d p[1]=0x%x\n", blank_mode, p[5], p[1]);
+	struct bcm2708_fb *fb = to_bcm2708(info);
+	u32 value;
+	int ret;
+
+	switch (blank_mode) {
+	case FB_BLANK_UNBLANK:
+		value = 0;
+		break;
+	case FB_BLANK_NORMAL:
+	case FB_BLANK_VSYNC_SUSPEND:
+	case FB_BLANK_HSYNC_SUSPEND:
+	case FB_BLANK_POWERDOWN:
+		value = 1;
+		break;
+	default:
+		return -EINVAL;
 	}
-	return result;
+
+	ret = rpi_firmware_property(fb->fw, RPI_FIRMWARE_FRAMEBUFFER_BLANK,
+				    &value, sizeof(value));
+	if (ret)
+		dev_err(info->device, "bcm2708_fb_blank(%d) failed: %d\n",
+			blank_mode, ret);
+
+	return ret;
 }
 
 static int bcm2708_fb_pan_display(struct fb_var_screeninfo *var, struct fb_info *info)
@@ -408,25 +437,25 @@ static int bcm2708_fb_pan_display(struct
 
 static int bcm2708_ioctl(struct fb_info *info, unsigned int cmd, unsigned long arg)
 {
-	s32 result = -1;
-	u32 p[7];
-	if (cmd == FBIO_WAITFORVSYNC) {
-		p[0] = 28; //  size = sizeof u32 * length of p
-		p[1] = VCMSG_PROCESS_REQUEST; // process request
-		p[2] = VCMSG_SET_VSYNC; // (the tag id)
-		p[3] = 4; // (size of the response buffer)
-		p[4] = 4; // (size of the request data)
-		p[5] = 0; // dummy
-		p[6] = VCMSG_PROPERTY_END; // end tag
-
-		bcm_mailbox_property(&p, p[0]);
-
-		if ( p[1] == VCMSG_REQUEST_SUCCESSFUL )
-			result = 0;
-		else
-			pr_err("bcm2708_fb_ioctl %x,%lx returns=%d p[1]=0x%x\n", cmd, arg, p[5], p[1]);
+	struct bcm2708_fb *fb = to_bcm2708(info);
+	u32 dummy = 0;
+	int ret;
+
+	switch (cmd) {
+	case FBIO_WAITFORVSYNC:
+		ret = rpi_firmware_property(fb->fw,
+					    RPI_FIRMWARE_FRAMEBUFFER_SET_VSYNC,
+					    &dummy, sizeof(dummy));
+		break;
+	default:
+		dev_err(info->device, "Unknown ioctl 0x%x\n", cmd);
+		return -EINVAL;
 	}
-	return result;
+
+	if (ret)
+		dev_err(info->device, "ioctl 0x%x failed (%d)\n", cmd, ret);
+
+	return ret;
 }
 static void bcm2708_fb_fillrect(struct fb_info *info,
 				const struct fb_fillrect *rect)
@@ -621,20 +650,7 @@ static struct fb_ops bcm2708_fb_ops = {
 static int bcm2708_fb_register(struct bcm2708_fb *fb)
 {
 	int ret;
-	dma_addr_t dma;
-	void *mem;
 
-	mem =
-	    dma_alloc_coherent(&fb->dev->dev, PAGE_ALIGN(sizeof(*fb->info)), &dma,
-			       GFP_KERNEL);
-
-	if (NULL == mem) {
-		pr_err(": unable to allocate fbinfo buffer\n");
-		ret = -ENOMEM;
-	} else {
-		fb->info = (struct fbinfo_s *)mem;
-		fb->dma = dma;
-	}
 	fb->fb.fbops = &bcm2708_fb_ops;
 	fb->fb.flags = FBINFO_FLAG_DEFAULT | FBINFO_HWACCEL_COPYAREA;
 	fb->fb.pseudo_palette = fb->cmap;
@@ -693,9 +709,22 @@ out:
 
 static int bcm2708_fb_probe(struct platform_device *dev)
 {
+	struct device_node *fw_np;
+	struct rpi_firmware *fw;
 	struct bcm2708_fb *fb;
 	int ret;
 
+	fw_np = of_parse_phandle(dev->dev.of_node, "firmware", 0);
+/* Remove comment when booting without Device Tree is no longer supported
+	if (!fw_np) {
+		dev_err(&dev->dev, "Missing firmware node\n");
+		return -ENOENT;
+	}
+*/
+	fw = rpi_firmware_get(fw_np);
+	if (!fw)
+		return -EPROBE_DEFER;
+
 	fb = kzalloc(sizeof(struct bcm2708_fb), GFP_KERNEL);
 	if (!fb) {
 		dev_err(&dev->dev,
@@ -704,6 +733,7 @@ static int bcm2708_fb_probe(struct platf
 		goto free_region;
 	}
 
+	fb->fw = fw;
 	bcm2708_fb_debugfs_init(fb);
 
 	fb->cb_base = dma_alloc_writecombine(&dev->dev, SZ_64K,
@@ -737,6 +767,7 @@ static int bcm2708_fb_probe(struct platf
 	       fb->dma_chan, fb->dma_chan_base);
 
 	fb->dev = dev;
+	fb->fb.device = &dev->dev;
 
 	ret = bcm2708_fb_register(fb);
 	if (ret == 0) {
@@ -769,8 +800,6 @@ static int bcm2708_fb_remove(struct plat
 	dma_free_writecombine(&dev->dev, SZ_64K, fb->cb_base, fb->cb_handle);
 	bcm_dma_chan_free(fb->dma_chan);
 
-	dma_free_coherent(NULL, PAGE_ALIGN(sizeof(*fb->info)), (void *)fb->info,
-			  fb->dma);
 	bcm2708_fb_debugfs_deinit(fb);
 
 	free_irq(fb->dma_irq, fb);