Merge tag 'trace-v7.3-2' of git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-tracegrafted

Pull tracing fixes from Steven Rostedt:

 - Fix error output of boot instance creation failure

   Currently if a boot instance creation fails, instead of printing out
   the name of the instance that failed, it prints "(null)". That is
   because it prints "cur_str" that had already been processed by
   strsep(). Print the saved name instead.

   While at it, print the error code of the failure.

 - Fix use-after-free for same named historgrams

   Histograms can be named so that they can be used in multiple events.
   But if the named histogram has a variable attached, the second event
   that uses the named histogram which duplicates it and needs to free
   the original after duplication leaves the old variable in place and
   still visible. If another histogram uses than variable, it will use
   the stale one which will try to reference the freed duplicate
   histogram and crash the kernel.

   Free the duplicate variables along with the duplicated histogram
   data.

 - Check return value of kthread_run() in event self test

   The events self tests uses a kthread for testing but does not check
   if it succeeded in creating a kthread. If the kthread creation were
   to fail, the code will still try to call kthread_stop() on the error
   returned.

 - Fix race between reading trace_pipe and updating subbuffer size

   If a user is reading the trace_pipe file at the same time they update
   the ring buffer sub-buffer size, can cause the trace_pipe read to
   read stale data. Add trace_access_lock() around updating the ring
   buffer sub-buffer size.

 - Fix eventfs_inode on failure path in creation of the events directory

   In the creation of the "events" directory, if after allocating the
   eventfs_inode a failure is detected, it calls cleanup_ei() which
   calls free_ei(). The free_ei() will test if eventfs_inode being freed
   has no children. It is a bug if it does. But on the failure case of
   the creation of the "events" directory, the children lists have not
   yet been initialized and the free will trigger a warning because
   list_empty() on an uninitialized list returns false.

   Move the initialization into init_ei() where it makes more sense and
   makes sure that a created eventfs_inode has its lists initialized
   upon creation.

 - Check return value of kthread_run() in ftrace direct sample code

   The sample code that shows how to use the ftrace direct calls does
   not test the return of kthread_run() to see if it succeeds. Return a
   failure if the kthread_run() doesn't succeed.

 - Clear user events state on fork in case of alloc failure

   On fork, the child gets a pointer to the parent's user events state.
   It makes a copy of it then updates the child's pointer to it. But if
   the allocation fails, the duplication function leaves the child with
   a pointer to its parent's descriptor. When the child cleans up its
   data, it will free the parent's descriptor while the parent is still
   using it.

   In the duplication function, set the child's user_event_mm to NULL
   before testing if the allocation succeeded, and when it exits it will
   not free the parent's descriptor.

 - Fix retry exhaustion in simple ring buffer reader swap

   simple_ring_buffer_swap_reader_page() starts with retry set to 8 and
   post-decrements it only after a failed link replacement. On the final
   attempt, a successful replacement leaves retry at zero, while a
   failed replacement leaves it at -1.

   But the check for success expects the retry value to be non-zero and
   exits with an error on zero. This is the opposite result. Fix it.

 - Fail nicely when the remote swap_reader_page() returns an error

   Currently, if the swap_reader_page() of a remote buffer fails, it
   triggers a WARN_ON_ONCE() and continues normally. Instead, have it
   exit with an error and a pr_warn() print instead of a full WARNING.

* tag 'trace-v7.3-2' of git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-trace:
  ring-buffer: Stop remote reader update when page swap fails
  tracing: Fix retry exhaustion in simple ring buffer reader swap
  tracing/user_events: Clear copied tracing state before fork duplication
  samples/ftrace: Fix kthread_stop() on ERR_PTR in ftrace-direct-multi-modify
  samples/ftrace: Fix kthread_stop() on ERR_PTR in ftrace-direct-modify
  eventfs: Initialize ei->children and ei->list in init_ei()
  tracing: Fix use-after-free in trace_pipe read on sub-buffer order change
  tracing: Fix crash passing ERR_PTR to kthread_stop()
  tracing: Fix use-after-free with same-name named triggers
  tracing: Fix logged instance name on creation failure

1 files changed, 793 insertions, 0 deletions

diff --git a/drivers/video/fbdev/carminefb.c b/drivers/video/fbdev/carminefb.c
new file mode 100644
index 000000000..fca50b796
--- /dev/null
+++ b/drivers/video/fbdev/carminefb.c
@@ -0,0 +1,793 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Frame buffer driver for the Carmine GPU.
+ *
+ * The driver configures the GPU as follows
+ * - FB0 is display 0 with unique memory area
+ * - FB1 is display 1 with unique memory area
+ * - both display use 32 bit colors
+ */
+#include <linux/aperture.h>
+#include <linux/delay.h>
+#include <linux/errno.h>
+#include <linux/fb.h>
+#include <linux/interrupt.h>
+#include <linux/pci.h>
+#include <linux/slab.h>
+#include <linux/module.h>
+
+#include "carminefb.h"
+#include "carminefb_regs.h"
+
+#if !defined(__LITTLE_ENDIAN) && !defined(__BIG_ENDIAN)
+#error  "The endianness of the target host has not been defined."
+#endif
+
+/*
+ * The initial video mode can be supplied via two different ways:
+ * - as a string that is passed to fb_find_mode() (module option fb_mode_str)
+ * - as an integer that picks the video mode from carmine_modedb[] (module
+ *   option fb_mode)
+ *
+ * If nothing is used than the initial video mode will be the
+ * CARMINEFB_DEFAULT_VIDEO_MODE member of the carmine_modedb[].
+ */
+#define CARMINEFB_DEFAULT_VIDEO_MODE	1
+
+static unsigned int fb_mode = CARMINEFB_DEFAULT_VIDEO_MODE;
+module_param(fb_mode, uint, 0444);
+MODULE_PARM_DESC(fb_mode, "Initial video mode as integer.");
+
+static char *fb_mode_str;
+module_param(fb_mode_str, charp, 0444);
+MODULE_PARM_DESC(fb_mode_str, "Initial video mode in characters.");
+
+/*
+ * Carminefb displays:
+ * 0b000 None
+ * 0b001 Display 0
+ * 0b010 Display 1
+ */
+static int fb_displays = CARMINE_USE_DISPLAY0 | CARMINE_USE_DISPLAY1;
+module_param(fb_displays, int, 0444);
+MODULE_PARM_DESC(fb_displays, "Bit mode, which displays are used");
+
+struct carmine_hw {
+	void __iomem *v_regs;
+	void __iomem *screen_mem;
+	struct fb_info *fb[MAX_DISPLAY];
+};
+
+struct carmine_resolution {
+	u32 htp;
+	u32 hsp;
+	u32 hsw;
+	u32 hdp;
+	u32 vtr;
+	u32 vsp;
+	u32 vsw;
+	u32 vdp;
+	u32 disp_mode;
+};
+
+struct carmine_fb {
+	void __iomem *display_reg;
+	void __iomem *screen_base;
+	u32 smem_offset;
+	u32 cur_mode;
+	u32 new_mode;
+	struct carmine_resolution *res;
+	u32 pseudo_palette[16];
+};
+
+static struct fb_fix_screeninfo carminefb_fix = {
+	.id = "Carmine",
+	.type = FB_TYPE_PACKED_PIXELS,
+	.visual = FB_VISUAL_TRUECOLOR,
+	.accel = FB_ACCEL_NONE,
+};
+
+static const struct fb_videomode carmine_modedb[] = {
+	{
+		.name		= "640x480",
+		.xres		= 640,
+		.yres		= 480,
+	}, {
+		.name		= "800x600",
+		.xres		= 800,
+		.yres		= 600,
+	},
+};
+
+static struct carmine_resolution car_modes[] = {
+	{
+		/* 640x480 */
+		.htp = 800,
+		.hsp = 672,
+		.hsw = 96,
+		.hdp = 640,
+		.vtr = 525,
+		.vsp = 490,
+		.vsw = 2,
+		.vdp = 480,
+		.disp_mode = 0x1400,
+	},
+	{
+		/* 800x600 */
+		.htp = 1060,
+		.hsp = 864,
+		.hsw = 72,
+		.hdp = 800,
+		.vtr = 628,
+		.vsp = 601,
+		.vsw = 2,
+		.vdp = 600,
+		.disp_mode = 0x0d00,
+	}
+};
+
+static int carmine_find_mode(const struct fb_var_screeninfo *var)
+{
+	int i;
+
+	for (i = 0; i < ARRAY_SIZE(car_modes); i++)
+		if (car_modes[i].hdp == var->xres &&
+		    car_modes[i].vdp == var->yres)
+			return i;
+	return -EINVAL;
+}
+
+static void c_set_disp_reg(const struct carmine_fb *par,
+		u32 offset, u32 val)
+{
+	writel(val, par->display_reg + offset);
+}
+
+static u32 c_get_disp_reg(const struct carmine_fb *par,
+		u32 offset)
+{
+	return readl(par->display_reg + offset);
+}
+
+static void c_set_hw_reg(const struct carmine_hw *hw,
+		u32 offset, u32 val)
+{
+	writel(val, hw->v_regs + offset);
+}
+
+static u32 c_get_hw_reg(const struct carmine_hw *hw,
+		u32 offset)
+{
+	return readl(hw->v_regs + offset);
+}
+
+static int carmine_setcolreg(unsigned regno, unsigned red, unsigned green,
+		unsigned blue, unsigned transp, struct fb_info *info)
+{
+	if (regno >= 16)
+		return 1;
+
+	red >>= 8;
+	green >>= 8;
+	blue >>= 8;
+	transp >>= 8;
+
+	((__be32 *)info->pseudo_palette)[regno] = cpu_to_be32(transp << 24 |
+		red << 0 | green << 8 | blue << 16);
+	return 0;
+}
+
+static int carmine_check_var(struct fb_var_screeninfo *var,
+		struct fb_info *info)
+{
+	int ret;
+
+	ret = carmine_find_mode(var);
+	if (ret < 0)
+		return ret;
+
+	if (var->grayscale || var->rotate || var->nonstd)
+		return -EINVAL;
+
+	var->xres_virtual = var->xres;
+	var->yres_virtual = var->yres;
+
+	var->bits_per_pixel = 32;
+
+#ifdef __BIG_ENDIAN
+	var->transp.offset = 24;
+	var->red.offset = 0;
+	var->green.offset = 8;
+	var->blue.offset = 16;
+#else
+	var->transp.offset = 24;
+	var->red.offset = 16;
+	var->green.offset = 8;
+	var->blue.offset = 0;
+#endif
+
+	var->red.length = 8;
+	var->green.length = 8;
+	var->blue.length = 8;
+	var->transp.length = 8;
+
+	var->red.msb_right = 0;
+	var->green.msb_right = 0;
+	var->blue.msb_right = 0;
+	var->transp.msb_right = 0;
+	return 0;
+}
+
+static void carmine_init_display_param(struct carmine_fb *par)
+{
+	u32 width;
+	u32 height;
+	u32 param;
+	u32 window_size;
+	u32 soffset = par->smem_offset;
+
+	c_set_disp_reg(par, CARMINE_DISP_REG_C_TRANS, 0);
+	c_set_disp_reg(par, CARMINE_DISP_REG_MLMR_TRANS, 0);
+	c_set_disp_reg(par, CARMINE_DISP_REG_CURSOR_MODE,
+			CARMINE_CURSOR0_PRIORITY_MASK |
+			CARMINE_CURSOR1_PRIORITY_MASK |
+			CARMINE_CURSOR_CUTZ_MASK);
+
+	/* Set default cursor position */
+	c_set_disp_reg(par, CARMINE_DISP_REG_CUR1_POS, 0 << 16 | 0);
+	c_set_disp_reg(par, CARMINE_DISP_REG_CUR2_POS, 0 << 16 | 0);
+
+	/* Set default display mode */
+	c_set_disp_reg(par, CARMINE_DISP_REG_L0_EXT_MODE, CARMINE_WINDOW_MODE |
+			CARMINE_EXT_CMODE_DIRECT24_RGBA);
+	c_set_disp_reg(par, CARMINE_DISP_REG_L1_EXT_MODE,
+			CARMINE_EXT_CMODE_DIRECT24_RGBA);
+	c_set_disp_reg(par, CARMINE_DISP_REG_L2_EXT_MODE, CARMINE_EXTEND_MODE |
+			CARMINE_EXT_CMODE_DIRECT24_RGBA);
+	c_set_disp_reg(par, CARMINE_DISP_REG_L3_EXT_MODE, CARMINE_EXTEND_MODE |
+			CARMINE_EXT_CMODE_DIRECT24_RGBA);
+	c_set_disp_reg(par, CARMINE_DISP_REG_L4_EXT_MODE, CARMINE_EXTEND_MODE |
+			CARMINE_EXT_CMODE_DIRECT24_RGBA);
+	c_set_disp_reg(par, CARMINE_DISP_REG_L5_EXT_MODE, CARMINE_EXTEND_MODE |
+			CARMINE_EXT_CMODE_DIRECT24_RGBA);
+	c_set_disp_reg(par, CARMINE_DISP_REG_L6_EXT_MODE, CARMINE_EXTEND_MODE |
+			CARMINE_EXT_CMODE_DIRECT24_RGBA);
+	c_set_disp_reg(par, CARMINE_DISP_REG_L7_EXT_MODE, CARMINE_EXTEND_MODE |
+			CARMINE_EXT_CMODE_DIRECT24_RGBA);
+
+	/* Set default frame size to layer mode register */
+	width = par->res->hdp * 4 / CARMINE_DISP_WIDTH_UNIT;
+	width = width << CARMINE_DISP_WIDTH_SHIFT;
+
+	height = par->res->vdp - 1;
+	param = width | height;
+
+	c_set_disp_reg(par, CARMINE_DISP_REG_L0_MODE_W_H, param);
+	c_set_disp_reg(par, CARMINE_DISP_REG_L1_WIDTH, width);
+	c_set_disp_reg(par, CARMINE_DISP_REG_L2_MODE_W_H, param);
+	c_set_disp_reg(par, CARMINE_DISP_REG_L3_MODE_W_H, param);
+	c_set_disp_reg(par, CARMINE_DISP_REG_L4_MODE_W_H, param);
+	c_set_disp_reg(par, CARMINE_DISP_REG_L5_MODE_W_H, param);
+	c_set_disp_reg(par, CARMINE_DISP_REG_L6_MODE_W_H, param);
+	c_set_disp_reg(par, CARMINE_DISP_REG_L7_MODE_W_H, param);
+
+	/* Set default pos and size */
+	window_size = (par->res->vdp - 1) << CARMINE_DISP_WIN_H_SHIFT;
+	window_size |= par->res->hdp;
+
+	c_set_disp_reg(par, CARMINE_DISP_REG_L0_WIN_POS, 0);
+	c_set_disp_reg(par, CARMINE_DISP_REG_L0_WIN_SIZE, window_size);
+	c_set_disp_reg(par, CARMINE_DISP_REG_L1_WIN_POS, 0);
+	c_set_disp_reg(par, CARMINE_DISP_REG_L1_WIN_SIZE, window_size);
+	c_set_disp_reg(par, CARMINE_DISP_REG_L2_WIN_POS, 0);
+	c_set_disp_reg(par, CARMINE_DISP_REG_L2_WIN_SIZE, window_size);
+	c_set_disp_reg(par, CARMINE_DISP_REG_L3_WIN_POS, 0);
+	c_set_disp_reg(par, CARMINE_DISP_REG_L3_WIN_SIZE, window_size);
+	c_set_disp_reg(par, CARMINE_DISP_REG_L4_WIN_POS, 0);
+	c_set_disp_reg(par, CARMINE_DISP_REG_L4_WIN_SIZE, window_size);
+	c_set_disp_reg(par, CARMINE_DISP_REG_L5_WIN_POS, 0);
+	c_set_disp_reg(par, CARMINE_DISP_REG_L5_WIN_SIZE, window_size);
+	c_set_disp_reg(par, CARMINE_DISP_REG_L6_WIN_POS, 0);
+	c_set_disp_reg(par, CARMINE_DISP_REG_L6_WIN_SIZE, window_size);
+	c_set_disp_reg(par, CARMINE_DISP_REG_L7_WIN_POS, 0);
+	c_set_disp_reg(par, CARMINE_DISP_REG_L7_WIN_SIZE, window_size);
+
+	/* Set default origin address */
+	c_set_disp_reg(par, CARMINE_DISP_REG_L0_ORG_ADR, soffset);
+	c_set_disp_reg(par, CARMINE_DISP_REG_L1_ORG_ADR, soffset);
+	c_set_disp_reg(par, CARMINE_DISP_REG_L2_ORG_ADR1, soffset);
+	c_set_disp_reg(par, CARMINE_DISP_REG_L3_ORG_ADR1, soffset);
+	c_set_disp_reg(par, CARMINE_DISP_REG_L4_ORG_ADR1, soffset);
+	c_set_disp_reg(par, CARMINE_DISP_REG_L5_ORG_ADR1, soffset);
+	c_set_disp_reg(par, CARMINE_DISP_REG_L6_ORG_ADR1, soffset);
+	c_set_disp_reg(par, CARMINE_DISP_REG_L7_ORG_ADR1, soffset);
+
+	/* Set default display address */
+	c_set_disp_reg(par, CARMINE_DISP_REG_L0_DISP_ADR, soffset);
+	c_set_disp_reg(par, CARMINE_DISP_REG_L2_DISP_ADR1, soffset);
+	c_set_disp_reg(par, CARMINE_DISP_REG_L3_DISP_ADR1, soffset);
+	c_set_disp_reg(par, CARMINE_DISP_REG_L4_DISP_ADR1, soffset);
+	c_set_disp_reg(par, CARMINE_DISP_REG_L5_DISP_ADR1, soffset);
+	c_set_disp_reg(par, CARMINE_DISP_REG_L6_DISP_ADR0, soffset);
+	c_set_disp_reg(par, CARMINE_DISP_REG_L7_DISP_ADR0, soffset);
+
+	/* Set default display position */
+	c_set_disp_reg(par, CARMINE_DISP_REG_L0_DISP_POS, 0);
+	c_set_disp_reg(par, CARMINE_DISP_REG_L2_DISP_POS, 0);
+	c_set_disp_reg(par, CARMINE_DISP_REG_L3_DISP_POS, 0);
+	c_set_disp_reg(par, CARMINE_DISP_REG_L4_DISP_POS, 0);
+	c_set_disp_reg(par, CARMINE_DISP_REG_L5_DISP_POS, 0);
+	c_set_disp_reg(par, CARMINE_DISP_REG_L6_DISP_POS, 0);
+	c_set_disp_reg(par, CARMINE_DISP_REG_L7_DISP_POS, 0);
+
+	/* Set default blend mode */
+	c_set_disp_reg(par, CARMINE_DISP_REG_BLEND_MODE_L0, 0);
+	c_set_disp_reg(par, CARMINE_DISP_REG_BLEND_MODE_L1, 0);
+	c_set_disp_reg(par, CARMINE_DISP_REG_BLEND_MODE_L2, 0);
+	c_set_disp_reg(par, CARMINE_DISP_REG_BLEND_MODE_L3, 0);
+	c_set_disp_reg(par, CARMINE_DISP_REG_BLEND_MODE_L4, 0);
+	c_set_disp_reg(par, CARMINE_DISP_REG_BLEND_MODE_L5, 0);
+	c_set_disp_reg(par, CARMINE_DISP_REG_BLEND_MODE_L6, 0);
+	c_set_disp_reg(par, CARMINE_DISP_REG_BLEND_MODE_L7, 0);
+
+	/* default transparency mode */
+	c_set_disp_reg(par, CARMINE_DISP_REG_L0_TRANS, 0);
+	c_set_disp_reg(par, CARMINE_DISP_REG_L1_TRANS, 0);
+	c_set_disp_reg(par, CARMINE_DISP_REG_L2_TRANS, 0);
+	c_set_disp_reg(par, CARMINE_DISP_REG_L3_TRANS, 0);
+	c_set_disp_reg(par, CARMINE_DISP_REG_L4_TRANS, 0);
+	c_set_disp_reg(par, CARMINE_DISP_REG_L5_TRANS, 0);
+	c_set_disp_reg(par, CARMINE_DISP_REG_L6_TRANS, 0);
+	c_set_disp_reg(par, CARMINE_DISP_REG_L7_TRANS, 0);
+
+	/* Set default read skip parameter */
+	c_set_disp_reg(par, CARMINE_DISP_REG_L0RM, 0);
+	c_set_disp_reg(par, CARMINE_DISP_REG_L2RM, 0);
+	c_set_disp_reg(par, CARMINE_DISP_REG_L3RM, 0);
+	c_set_disp_reg(par, CARMINE_DISP_REG_L4RM, 0);
+	c_set_disp_reg(par, CARMINE_DISP_REG_L5RM, 0);
+	c_set_disp_reg(par, CARMINE_DISP_REG_L6RM, 0);
+	c_set_disp_reg(par, CARMINE_DISP_REG_L7RM, 0);
+
+	c_set_disp_reg(par, CARMINE_DISP_REG_L0PX, 0);
+	c_set_disp_reg(par, CARMINE_DISP_REG_L2PX, 0);
+	c_set_disp_reg(par, CARMINE_DISP_REG_L3PX, 0);
+	c_set_disp_reg(par, CARMINE_DISP_REG_L4PX, 0);
+	c_set_disp_reg(par, CARMINE_DISP_REG_L5PX, 0);
+	c_set_disp_reg(par, CARMINE_DISP_REG_L6PX, 0);
+	c_set_disp_reg(par, CARMINE_DISP_REG_L7PX, 0);
+
+	c_set_disp_reg(par, CARMINE_DISP_REG_L0PY, 0);
+	c_set_disp_reg(par, CARMINE_DISP_REG_L2PY, 0);
+	c_set_disp_reg(par, CARMINE_DISP_REG_L3PY, 0);
+	c_set_disp_reg(par, CARMINE_DISP_REG_L4PY, 0);
+	c_set_disp_reg(par, CARMINE_DISP_REG_L5PY, 0);
+	c_set_disp_reg(par, CARMINE_DISP_REG_L6PY, 0);
+	c_set_disp_reg(par, CARMINE_DISP_REG_L7PY, 0);
+}
+
+static void set_display_parameters(struct carmine_fb *par)
+{
+	u32 mode;
+	u32 hdp, vdp, htp, hsp, hsw, vtr, vsp, vsw;
+
+	/*
+	 * display timing. Parameters are decreased by one because hardware
+	 * spec is 0 to (n - 1)
+	 * */
+	hdp = par->res->hdp - 1;
+	vdp = par->res->vdp - 1;
+	htp = par->res->htp - 1;
+	hsp = par->res->hsp - 1;
+	hsw = par->res->hsw - 1;
+	vtr = par->res->vtr - 1;
+	vsp = par->res->vsp - 1;
+	vsw = par->res->vsw - 1;
+
+	c_set_disp_reg(par, CARMINE_DISP_REG_H_TOTAL,
+			htp << CARMINE_DISP_HTP_SHIFT);
+	c_set_disp_reg(par, CARMINE_DISP_REG_H_PERIOD,
+			(hdp << CARMINE_DISP_HDB_SHIFT)	| hdp);
+	c_set_disp_reg(par, CARMINE_DISP_REG_V_H_W_H_POS,
+			(vsw << CARMINE_DISP_VSW_SHIFT) |
+			(hsw << CARMINE_DISP_HSW_SHIFT) |
+			(hsp));
+	c_set_disp_reg(par, CARMINE_DISP_REG_V_TOTAL,
+			vtr << CARMINE_DISP_VTR_SHIFT);
+	c_set_disp_reg(par, CARMINE_DISP_REG_V_PERIOD_POS,
+			(vdp << CARMINE_DISP_VDP_SHIFT) | vsp);
+
+	/* clock */
+	mode = c_get_disp_reg(par, CARMINE_DISP_REG_DCM1);
+	mode = (mode & ~CARMINE_DISP_DCM_MASK) |
+		(par->res->disp_mode & CARMINE_DISP_DCM_MASK);
+	/* enable video output and layer 0 */
+	mode |= CARMINE_DEN | CARMINE_L0E;
+	c_set_disp_reg(par, CARMINE_DISP_REG_DCM1, mode);
+}
+
+static int carmine_set_par(struct fb_info *info)
+{
+	struct carmine_fb *par = info->par;
+	int ret;
+
+	ret = carmine_find_mode(&info->var);
+	if (ret < 0)
+		return ret;
+
+	par->new_mode = ret;
+	if (par->cur_mode != par->new_mode) {
+
+		par->cur_mode = par->new_mode;
+		par->res = &car_modes[par->new_mode];
+
+		carmine_init_display_param(par);
+		set_display_parameters(par);
+	}
+
+	info->fix.line_length = info->var.xres * info->var.bits_per_pixel / 8;
+	return 0;
+}
+
+static int init_hardware(struct carmine_hw *hw)
+{
+	u32 flags;
+	u32 loops;
+	u32 ret;
+
+	/* Initialize Carmine */
+	/* Sets internal clock */
+	c_set_hw_reg(hw, CARMINE_CTL_REG + CARMINE_CTL_REG_CLOCK_ENABLE,
+			CARMINE_DFLT_IP_CLOCK_ENABLE);
+
+	/* Video signal output is turned off */
+	c_set_hw_reg(hw, CARMINE_DISP0_REG + CARMINE_DISP_REG_DCM1, 0);
+	c_set_hw_reg(hw, CARMINE_DISP1_REG + CARMINE_DISP_REG_DCM1, 0);
+
+	/* Software reset */
+	c_set_hw_reg(hw, CARMINE_CTL_REG + CARMINE_CTL_REG_SOFTWARE_RESET, 1);
+	c_set_hw_reg(hw, CARMINE_CTL_REG + CARMINE_CTL_REG_SOFTWARE_RESET, 0);
+
+	/* I/O mode settings */
+	flags = CARMINE_DFLT_IP_DCTL_IO_CONT1 << 16 |
+		CARMINE_DFLT_IP_DCTL_IO_CONT0;
+	c_set_hw_reg(hw, CARMINE_DCTL_REG + CARMINE_DCTL_REG_IOCONT1_IOCONT0,
+			flags);
+
+	/* DRAM initial sequence */
+	flags = CARMINE_DFLT_IP_DCTL_MODE << 16 | CARMINE_DFLT_IP_DCTL_ADD;
+	c_set_hw_reg(hw, CARMINE_DCTL_REG + CARMINE_DCTL_REG_MODE_ADD,
+			flags);
+
+	flags = CARMINE_DFLT_IP_DCTL_SET_TIME1 << 16 |
+		CARMINE_DFLT_IP_DCTL_EMODE;
+	c_set_hw_reg(hw, CARMINE_DCTL_REG + CARMINE_DCTL_REG_SETTIME1_EMODE,
+			flags);
+
+	flags = CARMINE_DFLT_IP_DCTL_REFRESH << 16 |
+		CARMINE_DFLT_IP_DCTL_SET_TIME2;
+	c_set_hw_reg(hw, CARMINE_DCTL_REG + CARMINE_DCTL_REG_REFRESH_SETTIME2,
+			flags);
+
+	flags = CARMINE_DFLT_IP_DCTL_RESERVE2 << 16 |
+		CARMINE_DFLT_IP_DCTL_FIFO_DEPTH;
+	c_set_hw_reg(hw, CARMINE_DCTL_REG + CARMINE_DCTL_REG_RSV2_RSV1, flags);
+
+	flags = CARMINE_DFLT_IP_DCTL_DDRIF2 << 16 | CARMINE_DFLT_IP_DCTL_DDRIF1;
+	c_set_hw_reg(hw, CARMINE_DCTL_REG + CARMINE_DCTL_REG_DDRIF2_DDRIF1,
+			flags);
+
+	flags = CARMINE_DFLT_IP_DCTL_RESERVE0 << 16 |
+		CARMINE_DFLT_IP_DCTL_STATES;
+	c_set_hw_reg(hw, CARMINE_DCTL_REG + CARMINE_DCTL_REG_RSV0_STATES,
+			flags);
+
+	/* Executes DLL reset */
+	if (CARMINE_DCTL_DLL_RESET) {
+		for (loops = 0; loops < CARMINE_DCTL_INIT_WAIT_LIMIT; loops++) {
+
+			ret = c_get_hw_reg(hw, CARMINE_DCTL_REG +
+					CARMINE_DCTL_REG_RSV0_STATES);
+			ret &= CARMINE_DCTL_REG_STATES_MASK;
+			if (!ret)
+				break;
+
+			mdelay(CARMINE_DCTL_INIT_WAIT_INTERVAL);
+		}
+
+		if (loops >= CARMINE_DCTL_INIT_WAIT_LIMIT) {
+			printk(KERN_ERR "DRAM init failed\n");
+			return -EIO;
+		}
+	}
+
+	flags = CARMINE_DFLT_IP_DCTL_MODE_AFT_RST << 16 |
+		CARMINE_DFLT_IP_DCTL_ADD;
+	c_set_hw_reg(hw, CARMINE_DCTL_REG + CARMINE_DCTL_REG_MODE_ADD, flags);
+
+	flags = CARMINE_DFLT_IP_DCTL_RESERVE0 << 16 |
+		CARMINE_DFLT_IP_DCTL_STATES_AFT_RST;
+	c_set_hw_reg(hw, CARMINE_DCTL_REG + CARMINE_DCTL_REG_RSV0_STATES,
+			flags);
+
+	/* Initialize the write back register */
+	c_set_hw_reg(hw, CARMINE_WB_REG + CARMINE_WB_REG_WBM,
+			CARMINE_WB_REG_WBM_DEFAULT);
+
+	/* Initialize the Kottos registers */
+	c_set_hw_reg(hw, CARMINE_GRAPH_REG + CARMINE_GRAPH_REG_VRINTM, 0);
+	c_set_hw_reg(hw, CARMINE_GRAPH_REG + CARMINE_GRAPH_REG_VRERRM, 0);
+
+	/* Set DC offsets */
+	c_set_hw_reg(hw, CARMINE_GRAPH_REG + CARMINE_GRAPH_REG_DC_OFFSET_PX, 0);
+	c_set_hw_reg(hw, CARMINE_GRAPH_REG + CARMINE_GRAPH_REG_DC_OFFSET_PY, 0);
+	c_set_hw_reg(hw, CARMINE_GRAPH_REG + CARMINE_GRAPH_REG_DC_OFFSET_LX, 0);
+	c_set_hw_reg(hw, CARMINE_GRAPH_REG + CARMINE_GRAPH_REG_DC_OFFSET_LY, 0);
+	c_set_hw_reg(hw, CARMINE_GRAPH_REG + CARMINE_GRAPH_REG_DC_OFFSET_TX, 0);
+	c_set_hw_reg(hw, CARMINE_GRAPH_REG + CARMINE_GRAPH_REG_DC_OFFSET_TY, 0);
+	return 0;
+}
+
+static const struct fb_ops carminefb_ops = {
+	.owner		= THIS_MODULE,
+	FB_DEFAULT_IOMEM_OPS,
+	.fb_check_var	= carmine_check_var,
+	.fb_set_par	= carmine_set_par,
+	.fb_setcolreg	= carmine_setcolreg,
+};
+
+static int alloc_carmine_fb(void __iomem *regs, void __iomem *smem_base,
+			    int smem_offset, struct device *device,
+			    struct fb_info **rinfo)
+{
+	int ret;
+	struct fb_info *info;
+	struct carmine_fb *par;
+
+	info = framebuffer_alloc(sizeof *par, device);
+	if (!info)
+		return -ENOMEM;
+
+	par = info->par;
+	par->display_reg = regs;
+	par->smem_offset = smem_offset;
+
+	info->screen_base = smem_base + smem_offset;
+	info->screen_size = CARMINE_DISPLAY_MEM;
+	info->fbops = &carminefb_ops;
+
+	info->fix = carminefb_fix;
+	info->pseudo_palette = par->pseudo_palette;
+
+	ret = fb_alloc_cmap(&info->cmap, 256, 1);
+	if (ret < 0)
+		goto err_free_fb;
+
+	if (fb_mode >= ARRAY_SIZE(carmine_modedb))
+		fb_mode = CARMINEFB_DEFAULT_VIDEO_MODE;
+
+	par->cur_mode = par->new_mode = ~0;
+
+	ret = fb_find_mode(&info->var, info, fb_mode_str, carmine_modedb,
+			ARRAY_SIZE(carmine_modedb),
+			&carmine_modedb[fb_mode], 32);
+	if (!ret || ret == 4) {
+		ret = -EINVAL;
+		goto err_dealloc_cmap;
+	}
+
+	fb_videomode_to_modelist(carmine_modedb, ARRAY_SIZE(carmine_modedb),
+			&info->modelist);
+
+	ret = register_framebuffer(info);
+	if (ret < 0)
+		goto err_dealloc_cmap;
+
+	fb_info(info, "%s frame buffer device\n", info->fix.id);
+
+	*rinfo = info;
+	return 0;
+
+err_dealloc_cmap:
+	fb_destroy_modelist(&info->modelist);
+	fb_dealloc_cmap(&info->cmap);
+err_free_fb:
+	framebuffer_release(info);
+	return ret;
+}
+
+static void cleanup_fb_device(struct fb_info *info)
+{
+	if (info) {
+		unregister_framebuffer(info);
+		fb_dealloc_cmap(&info->cmap);
+		framebuffer_release(info);
+	}
+}
+
+static int carminefb_probe(struct pci_dev *dev, const struct pci_device_id *ent)
+{
+	struct carmine_hw *hw;
+	struct device *device = &dev->dev;
+	struct fb_info *info;
+	int ret;
+
+	ret = aperture_remove_conflicting_pci_devices(dev, "carminefb");
+	if (ret)
+		return ret;
+
+	ret = pci_enable_device(dev);
+	if (ret)
+		return ret;
+
+	ret = -ENOMEM;
+	hw = kzalloc_obj(*hw);
+	if (!hw)
+		goto err_enable_pci;
+
+	carminefb_fix.mmio_start = pci_resource_start(dev, CARMINE_CONFIG_BAR);
+	carminefb_fix.mmio_len = pci_resource_len(dev, CARMINE_CONFIG_BAR);
+
+	if (!request_mem_region(carminefb_fix.mmio_start,
+				carminefb_fix.mmio_len,
+				"carminefb regbase")) {
+		printk(KERN_ERR "carminefb: Can't reserve regbase.\n");
+		ret = -EBUSY;
+		goto err_free_hw;
+	}
+	hw->v_regs = ioremap(carminefb_fix.mmio_start,
+			carminefb_fix.mmio_len);
+	if (!hw->v_regs) {
+		printk(KERN_ERR "carminefb: Can't remap %s register.\n",
+				carminefb_fix.id);
+		goto err_free_reg_mmio;
+	}
+
+	carminefb_fix.smem_start = pci_resource_start(dev, CARMINE_MEMORY_BAR);
+	carminefb_fix.smem_len = pci_resource_len(dev, CARMINE_MEMORY_BAR);
+
+	/* The memory area tends to be very large (256 MiB). Remap only what
+	 * is required for that largest resolution to avoid remaps at run
+	 * time
+	 */
+	if (carminefb_fix.smem_len > CARMINE_TOTAL_DISPLAY_MEM)
+		carminefb_fix.smem_len = CARMINE_TOTAL_DISPLAY_MEM;
+
+	else if (carminefb_fix.smem_len < CARMINE_TOTAL_DISPLAY_MEM) {
+		printk(KERN_ERR "carminefb: Memory bar is only %d bytes, %d "
+				"are required.", carminefb_fix.smem_len,
+				CARMINE_TOTAL_DISPLAY_MEM);
+		goto err_unmap_vregs;
+	}
+
+	if (!request_mem_region(carminefb_fix.smem_start,
+				carminefb_fix.smem_len,	"carminefb smem")) {
+		printk(KERN_ERR "carminefb: Can't reserve smem.\n");
+		goto err_unmap_vregs;
+	}
+
+	hw->screen_mem = ioremap(carminefb_fix.smem_start,
+			carminefb_fix.smem_len);
+	if (!hw->screen_mem) {
+		printk(KERN_ERR "carmine: Can't ioremap smem area.\n");
+		goto err_reg_smem;
+	}
+
+	ret = init_hardware(hw);
+	if (ret)
+		goto err_unmap_screen;
+
+	info = NULL;
+	if (fb_displays & CARMINE_USE_DISPLAY0) {
+		ret = alloc_carmine_fb(hw->v_regs + CARMINE_DISP0_REG,
+				hw->screen_mem, CARMINE_DISPLAY_MEM * 0,
+				device, &info);
+		if (ret)
+			goto err_deinit_hw;
+	}
+
+	hw->fb[0] = info;
+
+	info = NULL;
+	if (fb_displays & CARMINE_USE_DISPLAY1) {
+		ret = alloc_carmine_fb(hw->v_regs + CARMINE_DISP1_REG,
+				hw->screen_mem, CARMINE_DISPLAY_MEM * 1,
+				device, &info);
+		if (ret)
+			goto err_cleanup_fb0;
+	}
+
+	hw->fb[1] = info;
+	info = NULL;
+
+	pci_set_drvdata(dev, hw);
+	return 0;
+
+err_cleanup_fb0:
+	cleanup_fb_device(hw->fb[0]);
+err_deinit_hw:
+	/* disable clock, etc */
+	c_set_hw_reg(hw, CARMINE_CTL_REG + CARMINE_CTL_REG_CLOCK_ENABLE, 0);
+err_unmap_screen:
+	iounmap(hw->screen_mem);
+err_reg_smem:
+	release_mem_region(carminefb_fix.smem_start, carminefb_fix.smem_len);
+err_unmap_vregs:
+	iounmap(hw->v_regs);
+err_free_reg_mmio:
+	release_mem_region(carminefb_fix.mmio_start, carminefb_fix.mmio_len);
+err_free_hw:
+	kfree(hw);
+err_enable_pci:
+	pci_disable_device(dev);
+	return ret;
+}
+
+static void carminefb_remove(struct pci_dev *dev)
+{
+	struct carmine_hw *hw = pci_get_drvdata(dev);
+	struct fb_fix_screeninfo fix;
+	int i;
+
+	/* in case we use only fb1 and not fb1 */
+	if (hw->fb[0])
+		fix = hw->fb[0]->fix;
+	else
+		fix = hw->fb[1]->fix;
+
+	/* deactivate display(s) and switch clocks */
+	c_set_hw_reg(hw, CARMINE_DISP0_REG + CARMINE_DISP_REG_DCM1, 0);
+	c_set_hw_reg(hw, CARMINE_DISP1_REG + CARMINE_DISP_REG_DCM1, 0);
+	c_set_hw_reg(hw, CARMINE_CTL_REG + CARMINE_CTL_REG_CLOCK_ENABLE, 0);
+
+	for (i = 0; i < MAX_DISPLAY; i++)
+		cleanup_fb_device(hw->fb[i]);
+
+	iounmap(hw->screen_mem);
+	release_mem_region(fix.smem_start, fix.smem_len);
+	iounmap(hw->v_regs);
+	release_mem_region(fix.mmio_start, fix.mmio_len);
+
+	pci_disable_device(dev);
+	kfree(hw);
+}
+
+#define PCI_VENDOR_ID_FUJITU_LIMITED 0x10cf
+static struct pci_device_id carmine_devices[] = {
+	{ PCI_DEVICE(PCI_VENDOR_ID_FUJITU_LIMITED, 0x202b) },
+	{ }
+};
+
+MODULE_DEVICE_TABLE(pci, carmine_devices);
+
+static struct pci_driver carmine_pci_driver = {
+	.name		= "carminefb",
+	.id_table	= carmine_devices,
+	.probe		= carminefb_probe,
+	.remove		= carminefb_remove,
+};
+
+static int __init carminefb_init(void)
+{
+	if (fb_modesetting_disabled("carminefb"))
+		return -ENODEV;
+
+	if (!(fb_displays &
+		(CARMINE_USE_DISPLAY0 | CARMINE_USE_DISPLAY1))) {
+		printk(KERN_ERR "If you disable both displays than you don't "
+				"need the driver at all\n");
+		return -EINVAL;
+	}
+	return pci_register_driver(&carmine_pci_driver);
+}
+module_init(carminefb_init);
+
+static void __exit carminefb_cleanup(void)
+{
+	pci_unregister_driver(&carmine_pci_driver);
+}
+module_exit(carminefb_cleanup);
+
+MODULE_AUTHOR("Sebastian Siewior <bigeasy@linutronix.de>");
+MODULE_DESCRIPTION("Framebuffer driver for Fujitsu Carmine based devices");
+MODULE_LICENSE("GPL v2");