[PATCH 1/2] video: Add i.MX23/28 framebuffer driver
Sascha Hauer
s.hauer at pengutronix.de
Wed Feb 16 04:56:38 EST 2011
changes since v1:
- Add a LCDC_ prefix to the register names.
- use set/clear registers where appropriate
- protect call to mxsfb_disable_controller() in mxsfb_remove()
with a (host->enabled) as suggested by Lothar Wassmann
Signed-off-by: Sascha Hauer <s.hauer at pengutronix.de>
Cc: Paul Mundt <lethal at linux-sh.org>
Cc: linux-fbdev at vger.kernel.org
Cc: Shawn Guo <shawn.guo at freescale.com>
---
arch/arm/mach-mxs/include/mach/fb.h | 48 ++
drivers/video/Kconfig | 9 +
drivers/video/Makefile | 1 +
drivers/video/mxsfb.c | 910 +++++++++++++++++++++++++++++++++++
4 files changed, 968 insertions(+), 0 deletions(-)
create mode 100644 arch/arm/mach-mxs/include/mach/fb.h
create mode 100644 drivers/video/mxsfb.c
diff --git a/arch/arm/mach-mxs/include/mach/fb.h b/arch/arm/mach-mxs/include/mach/fb.h
new file mode 100644
index 0000000..923f397
--- /dev/null
+++ b/arch/arm/mach-mxs/include/mach/fb.h
@@ -0,0 +1,48 @@
+/*
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ * 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., 51 Franklin Street, Fifth Floor, Boston,
+ * MA 02110-1301, USA.
+ */
+
+#ifndef __MACH_FB_H
+#define __MACH_FB_H
+
+#include <linux/fb.h>
+
+#define STMLCDIF_8BIT 1 /** pixel data bus to the display is of 8 bit width */
+#define STMLCDIF_16BIT 0 /** pixel data bus to the display is of 16 bit width */
+#define STMLCDIF_18BIT 2 /** pixel data bus to the display is of 18 bit width */
+#define STMLCDIF_24BIT 3 /** pixel data bus to the display is of 24 bit width */
+
+#define FB_SYNC_DATA_ENABLE_HIGH_ACT 64
+
+struct mxsfb_platform_data {
+ struct fb_videomode *mode_list;
+ unsigned mode_count;
+
+ unsigned default_bpp;
+
+ unsigned dotclk_delay; /* refer manual HW_LCDIF_VDCTRL4 register */
+ unsigned ld_intf_width; /* refer STMLCDIF_* macros */
+
+ unsigned fb_size; /* Size of the video memory. If zero a
+ * default will be used
+ */
+ unsigned long fb_phys; /* physical address for the video memory. If
+ * zero the framebuffer memory will be dynamically
+ * allocated. If specified,fb_size must also be specified.
+ * fb_phys must be unused by Linux.
+ */
+};
+
+#endif /* __MACH_FB_H */
diff --git a/drivers/video/Kconfig b/drivers/video/Kconfig
index 6bafb51b..e0ea23f 100644
--- a/drivers/video/Kconfig
+++ b/drivers/video/Kconfig
@@ -2365,6 +2365,15 @@ config FB_JZ4740
help
Framebuffer support for the JZ4740 SoC.
+config FB_MXS
+ tristate "MXS LCD framebuffer support"
+ depends on FB && ARCH_MXS
+ select FB_CFB_FILLRECT
+ select FB_CFB_COPYAREA
+ select FB_CFB_IMAGEBLIT
+ help
+ Framebuffer support for the MXS SoC.
+
source "drivers/video/omap/Kconfig"
source "drivers/video/omap2/Kconfig"
diff --git a/drivers/video/Makefile b/drivers/video/Makefile
index 8c8fabd..9a096ae 100644
--- a/drivers/video/Makefile
+++ b/drivers/video/Makefile
@@ -153,6 +153,7 @@ obj-$(CONFIG_FB_BFIN_T350MCQB) += bfin-t350mcqb-fb.o
obj-$(CONFIG_FB_BFIN_7393) += bfin_adv7393fb.o
obj-$(CONFIG_FB_MX3) += mx3fb.o
obj-$(CONFIG_FB_DA8XX) += da8xx-fb.o
+obj-$(CONFIG_FB_MXS) += mxsfb.o
# the test framebuffer is last
obj-$(CONFIG_FB_VIRTUAL) += vfb.o
diff --git a/drivers/video/mxsfb.c b/drivers/video/mxsfb.c
new file mode 100644
index 0000000..ac9939b
--- /dev/null
+++ b/drivers/video/mxsfb.c
@@ -0,0 +1,910 @@
+/*
+ * Copyright (C) 2010 Juergen Beisert, Pengutronix
+ *
+ * This code is based on:
+ * Author: Vitaly Wool <vital at embeddedalley.com>
+ *
+ * Copyright 2008-2009 Freescale Semiconductor, Inc. All Rights Reserved.
+ * Copyright 2008 Embedded Alley Solutions, Inc All Rights Reserved.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ * 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.
+ */
+
+#define DRIVER_NAME "mxsfb"
+
+/**
+ * @file
+ * @brief LCDIF driver for i.MX23 and i.MX28
+ *
+ * The LCDIF support four modes of operation
+ * - MPU interface (to drive smart displays) -> not supported yet
+ * - VSYNC interface (like MPU interface plus Vsync) -> not supported yet
+ * - Dotclock interface (to drive LC displays with RGB data and sync signals)
+ * - DVI (to drive ITU-R BT656) -> not supported yet
+ *
+ * This driver depends on a correct setup of the pins used for this purpose
+ * (platform specific).
+ *
+ * For the developer: Don't forget to set the data bus width to the display
+ * in the imx_fb_videomode structure. You will else end up with ugly colours.
+ * If you fight against jitter you can vary the clock delay. This is a feature
+ * of the i.MX28 and you can vary it between 2 ns ... 8 ns in 2 ns steps. Give
+ * the required value in the imx_fb_videomode structure.
+ */
+
+#include <linux/kernel.h>
+#include <linux/platform_device.h>
+#include <linux/clk.h>
+#include <linux/dma-mapping.h>
+#include <linux/io.h>
+#include <mach/fb.h>
+#include <mach/hardware.h>
+#include <mach/mxs.h>
+
+#define REG_SET 4
+#define REG_CLR 8
+
+#define LCDC_CTRL 0x00
+#define LCDC_CTRL1 0x10
+#define LCDC_MX28_CTRL2 0x20
+#define LCDC_MX23_TRANSFER_COUNT 0x20
+#define LCDC_MX28_TRANSFER_COUNT 0x30
+#define LCDC_MX28_CUR_BUF 0x40
+#define LCDC_MX28_NEXT_BUF 0x50
+#define LCDC_MX23_CUR_BUF 0x30
+#define LCDC_MX23_NEXT_BUF 0x40
+#define LCDC_TIMING 0x60
+#define LCDC_VDCTRL0 0x70
+#define LCDC_VDCTRL1 0x80
+#define LCDC_VDCTRL2 0x90
+#define LCDC_VDCTRL3 0xa0
+#define LCDC_VDCTRL4 0xb0
+#define LCDC_DVICTRL0 0xc0
+#define LCDC_DVICTRL1 0xd0
+#define LCDC_DVICTRL2 0xe0
+#define LCDC_DVICTRL3 0xf0
+#define LCDC_DVICTRL4 0x100
+#define LCDC_MX28_DATA 0x180
+#define LCDC_MX23_DATA 0x1b0
+#define LCDC_MX28_DEBUG0 0x1d0
+#define LCDC_MX23_DEBUG0 0x1f0
+
+#define CTRL_SFTRST (1 << 31)
+#define CTRL_CLKGATE (1 << 30)
+#define CTRL_BYPASS_COUNT (1 << 19)
+#define CTRL_VSYNC_MODE (1 << 18)
+#define CTRL_DOTCLK_MODE (1 << 17)
+#define CTRL_DATA_SELECT (1 << 16)
+#define CTRL_SET_BUS_WIDTH(x) (((x) & 0x3) << 10)
+#define CTRL_GET_BUS_WIDTH(x) (((x) >> 10) & 0x3)
+#define CTRL_SET_WORD_LENGTH(x) (((x) & 0x3) << 8)
+#define CTRL_GET_WORD_LENGTH(x) (((x) >> 8) & 0x3)
+#define CTRL_MASTER (1 << 5)
+#define CTRL_DF16 (1 << 3)
+#define CTRL_DF18 (1 << 2)
+#define CTRL_DF24 (1 << 1)
+#define CTRL_RUN (1 << 0)
+
+#define CTRL1_FIFO_CLEAR (1 << 21)
+#define CTRL1_SET_BYTE_PACKAGING(x) (((x) & 0xf) << 16)
+#define CTRL1_GET_BYTE_PACKAGING(x) (((x) >> 16) & 0xf)
+
+#define TRANSFER_COUNT_SET_VCOUNT(x) (((x) & 0xffff) << 16)
+#define TRANSFER_COUNT_GET_VCOUNT(x) (((x) >> 16) & 0xffff)
+#define TRANSFER_COUNT_SET_HCOUNT(x) ((x) & 0xffff)
+#define TRANSFER_COUNT_GET_HCOUNT(x) ((x) & 0xffff)
+
+
+#define VDCTRL0_ENABLE_PRESENT (1 << 28)
+#define VDCTRL0_VSYNC_ACT_HIGH (1 << 27)
+#define VDCTRL0_HSYNC_ACT_HIGH (1 << 26)
+#define VDCTRL0_DOTCLK_ACTIVE_HIGH (1 << 25)
+#define VDCTRL0_POL_ACTIVE_HIGH (1 << 24)
+#define VDCTRL0_VSYNC_PERIOD_UNIT (1 << 21)
+#define VDCTRL0_VSYNC_PULSE_WIDTH_UNIT (1 << 20)
+#define VDCTRL0_HALF_LINE (1 << 19)
+#define VDCTRL0_HALF_LINE_MODE (1 << 18)
+#define VDCTRL0_SET_VSYNC_PULSE_WIDTH(x) ((x) & 0x3ffff)
+#define VDCTRL0_GET_VSYNC_PULSE_WIDTH(x) ((x) & 0x3ffff)
+
+#define VDCTRL2_SET_HSYNC_PERIOD(x) ((x) & 0x3ffff)
+#define VDCTRL2_GET_HSYNC_PERIOD(x) ((x) & 0x3ffff)
+
+#define VDCTRL3_MUX_SYNC_SIGNALS (1 << 29)
+#define VDCTRL3_VSYNC_ONLY (1 << 28)
+#define SET_HOR_WAIT_CNT(x) (((x) & 0xfff) << 16)
+#define GET_HOR_WAIT_CNT(x) (((x) >> 16) & 0xfff)
+#define SET_VERT_WAIT_CNT(x) ((x) & 0xffff)
+#define GET_VERT_WAIT_CNT(x) ((x) & 0xffff)
+
+#define VDCTRL4_SET_DOTCLK_DLY(x) (((x) & 0x7) << 29) /* i.MX28 only */
+#define VDCTRL4_GET_DOTCLK_DLY(x) (((x) >> 29) & 0x7) /* i.MX28 only */
+#define VDCTRL4_SYNC_SIGNALS_ON (1 << 18)
+#define SET_DOTCLK_H_VALID_DATA_CNT(x) ((x) & 0x3ffff)
+
+#define DEBUG0_HSYNC (1 < 26)
+#define DEBUG0_VSYNC (1 < 25)
+
+#define MIN_XRES 120
+#define MIN_YRES 120
+
+#define RED 0
+#define GREEN 1
+#define BLUE 2
+#define TRANSP 3
+
+enum mxsfb_devtype {
+ MXSFB_MX23,
+ MXSFB_MX28,
+};
+
+/* CPU dependent register offsets */
+struct mxsfb_devdata {
+ unsigned transfer_count;
+ unsigned cur_buf;
+ unsigned next_buf;
+ unsigned debug0;
+ unsigned hs_wdth_mask;
+ unsigned hs_wdth_shift;
+};
+
+struct mxsfb_info {
+ struct fb_info fb_info;
+ struct platform_device *pdev;
+ struct clk *clk;
+ void __iomem *base; /* registers */
+ unsigned allocated_size;
+ int enabled;
+ unsigned ld_intf_width;
+ unsigned dotclk_delay;
+ const struct mxsfb_devdata *devdata;
+ int mapped;
+};
+
+static const struct mxsfb_devdata mxsfb_devdata[] = {
+ [MXSFB_MX23] = {
+ .transfer_count = LCDC_MX23_TRANSFER_COUNT,
+ .cur_buf = LCDC_MX23_CUR_BUF,
+ .next_buf = LCDC_MX23_NEXT_BUF,
+ .debug0 = LCDC_MX23_DEBUG0,
+ .hs_wdth_mask = 0xff,
+ .hs_wdth_shift = 24,
+ },
+ [MXSFB_MX28] = {
+ .transfer_count = LCDC_MX28_TRANSFER_COUNT,
+ .cur_buf = LCDC_MX28_CUR_BUF,
+ .next_buf = LCDC_MX28_NEXT_BUF,
+ .debug0 = LCDC_MX28_DEBUG0,
+ .hs_wdth_mask = 0x3fff,
+ .hs_wdth_shift = 18,
+ },
+};
+
+#define to_imxfb_host(x) (container_of(x, struct mxsfb_info, fb_info))
+
+/* mask and shift depends on architecture */
+static inline u32 set_hsync_pulse_width(struct mxsfb_info *host, unsigned val)
+{
+ return (val & host->devdata->hs_wdth_mask) <<
+ host->devdata->hs_wdth_shift;
+}
+
+static inline u32 get_hsync_pulse_width(struct mxsfb_info *host, unsigned val)
+{
+ return (val >> host->devdata->hs_wdth_shift) &
+ host->devdata->hs_wdth_mask;
+}
+
+static const struct fb_bitfield def_rgb565[] = {
+ [RED] = {
+ .offset = 11,
+ .length = 5,
+ },
+ [GREEN] = {
+ .offset = 5,
+ .length = 6,
+ },
+ [BLUE] = {
+ .offset = 0,
+ .length = 5,
+ },
+ [TRANSP] = { /* no support for transparency */
+ .length = 0,
+ }
+};
+
+static const struct fb_bitfield def_rgb666[] = {
+ [RED] = {
+ .offset = 16,
+ .length = 6,
+ },
+ [GREEN] = {
+ .offset = 8,
+ .length = 6,
+ },
+ [BLUE] = {
+ .offset = 0,
+ .length = 6,
+ },
+ [TRANSP] = { /* no support for transparency */
+ .length = 0,
+ }
+};
+
+static const struct fb_bitfield def_rgb888[] = {
+ [RED] = {
+ .offset = 16,
+ .length = 8,
+ },
+ [GREEN] = {
+ .offset = 8,
+ .length = 8,
+ },
+ [BLUE] = {
+ .offset = 0,
+ .length = 8,
+ },
+ [TRANSP] = { /* no support for transparency */
+ .length = 0,
+ }
+};
+
+static inline unsigned chan_to_field(unsigned chan, struct fb_bitfield *bf)
+{
+ chan &= 0xffff;
+ chan >>= 16 - bf->length;
+ return chan << bf->offset;
+}
+
+static int mxsfb_check_var(struct fb_var_screeninfo *var,
+ struct fb_info *fb_info)
+{
+ struct mxsfb_info *host = to_imxfb_host(fb_info);
+ const struct fb_bitfield *rgb = NULL;
+
+ if (var->xres < MIN_XRES)
+ var->xres = MIN_XRES;
+ if (var->yres < MIN_YRES)
+ var->yres = MIN_YRES;
+
+ var->xres_virtual = var->xres;
+
+ var->yres_virtual = var->yres;
+
+ switch (var->bits_per_pixel) {
+ case 16:
+ /* always expect RGB 565 */
+ rgb = def_rgb565;
+ break;
+ case 32:
+ switch (host->ld_intf_width) {
+ case STMLCDIF_8BIT:
+ pr_debug("Unsupported LCD bus width mapping\n");
+ break;
+ case STMLCDIF_16BIT:
+ case STMLCDIF_18BIT:
+ /* 24 bit to 18 bit mapping */
+ rgb = def_rgb666;
+ break;
+ case STMLCDIF_24BIT:
+ /* real 24 bit */
+ rgb = def_rgb888;
+ break;
+ }
+ break;
+ default:
+ pr_debug("Unsupported colour depth: %u\n", var->bits_per_pixel);
+ return -EINVAL;
+ }
+
+ /*
+ * Copy the RGB parameters for this display
+ * from the machine specific parameters.
+ */
+ var->red = rgb[RED];
+ var->green = rgb[GREEN];
+ var->blue = rgb[BLUE];
+ var->transp = rgb[TRANSP];
+
+ return 0;
+}
+
+static void mxsfb_enable_controller(struct fb_info *fb_info)
+{
+ struct mxsfb_info *host = to_imxfb_host(fb_info);
+ u32 reg;
+
+ dev_dbg(&host->pdev->dev, "%s\n", __func__);
+
+ clk_enable(host->clk);
+ clk_set_rate(host->clk, PICOS2KHZ(fb_info->var.pixclock) * 1000U);
+
+ /* if it was disabled, re-enable the mode again */
+ writel(CTRL_DOTCLK_MODE, host->base + LCDC_CTRL + REG_SET);
+
+ /* enable the SYNC signals first, then the DMA engine */
+ reg = readl(host->base + LCDC_VDCTRL4);
+ reg |= VDCTRL4_SYNC_SIGNALS_ON;
+ writel(reg, host->base + LCDC_VDCTRL4);
+
+ writel(CTRL_RUN, host->base + LCDC_CTRL + REG_SET);
+
+ host->enabled = 1;
+}
+
+static void mxsfb_disable_controller(struct fb_info *fb_info)
+{
+ struct mxsfb_info *host = to_imxfb_host(fb_info);
+ unsigned loop;
+ u32 reg;
+
+ dev_dbg(&host->pdev->dev, "%s\n", __func__);
+
+ /*
+ * Even if we disable the controller here, it will still continue
+ * until its FIFOs are running out of data
+ */
+ writel(CTRL_DOTCLK_MODE, host->base + LCDC_CTRL + REG_CLR);
+
+ loop = 1000;
+ while (loop) {
+ reg = readl(host->base + LCDC_CTRL);
+ if (!(reg & CTRL_RUN))
+ break;
+ loop--;
+ }
+
+ writel(VDCTRL4_SYNC_SIGNALS_ON, host->base + LCDC_VDCTRL4 + REG_CLR);
+
+ clk_disable(host->clk);
+
+ host->enabled = 0;
+}
+
+static int mxsfb_set_par(struct fb_info *fb_info)
+{
+ struct mxsfb_info *host = to_imxfb_host(fb_info);
+ u32 ctrl, vdctrl0, vdctrl4;
+ int line_size, fb_size;
+ int reenable = 0;
+
+ line_size = fb_info->var.xres * (fb_info->var.bits_per_pixel >> 3);
+ fb_size = fb_info->var.yres_virtual * line_size;
+
+ if (fb_size > fb_info->fix.smem_len)
+ return -ENOMEM;
+
+ fb_info->fix.line_length = line_size;
+
+ /*
+ * It seems, you can't re-program the controller if it is still running.
+ * This may lead into shifted pictures (FIFO issue?).
+ * So, first stop the controller and drain its FIFOs
+ */
+ if (host->enabled) {
+ reenable = 1;
+ mxsfb_disable_controller(fb_info);
+ }
+
+ /* clear the FIFOs */
+ writel(CTRL1_FIFO_CLEAR, host->base + LCDC_CTRL1 + REG_SET);
+
+ ctrl = CTRL_BYPASS_COUNT | CTRL_MASTER |
+ CTRL_SET_BUS_WIDTH(host->ld_intf_width);;
+
+ switch (fb_info->var.bits_per_pixel) {
+ case 16:
+ dev_dbg(&host->pdev->dev, "Setting up RGB565 mode\n");
+ ctrl |= CTRL_SET_WORD_LENGTH(0);
+ writel(CTRL1_SET_BYTE_PACKAGING(0xf), host->base + LCDC_CTRL1);
+ break;
+ case 32:
+ dev_dbg(&host->pdev->dev, "Setting up RGB888/666 mode\n");
+ ctrl |= CTRL_SET_WORD_LENGTH(3);
+ switch (host->ld_intf_width) {
+ case STMLCDIF_8BIT:
+ dev_dbg(&host->pdev->dev,
+ "Unsupported LCD bus width mapping\n");
+ return -EINVAL;
+ case STMLCDIF_16BIT:
+ case STMLCDIF_18BIT:
+ /* 24 bit to 18 bit mapping */
+ ctrl |= CTRL_DF24; /* ignore the upper 2 bits in
+ * each colour component
+ */
+ break;
+ case STMLCDIF_24BIT:
+ /* real 24 bit */
+ break;
+ }
+ /* do not use packed pixels = one pixel per word instead */
+ writel(CTRL1_SET_BYTE_PACKAGING(0x7), host->base + LCDC_CTRL1);
+ break;
+ default:
+ dev_dbg(&host->pdev->dev, "Unhandled color depth of %u\n",
+ fb_info->var.bits_per_pixel);
+ return -EINVAL;
+ }
+
+ writel(ctrl, host->base + LCDC_CTRL);
+
+ writel(TRANSFER_COUNT_SET_VCOUNT(fb_info->var.yres) |
+ TRANSFER_COUNT_SET_HCOUNT(fb_info->var.xres),
+ host->base + host->devdata->transfer_count);
+
+ vdctrl0 = VDCTRL0_ENABLE_PRESENT | /* always in DOTCLOCK mode */
+ VDCTRL0_VSYNC_PERIOD_UNIT |
+ VDCTRL0_VSYNC_PULSE_WIDTH_UNIT |
+ VDCTRL0_SET_VSYNC_PULSE_WIDTH(fb_info->var.vsync_len);
+ if (fb_info->var.sync & FB_SYNC_HOR_HIGH_ACT)
+ vdctrl0 |= VDCTRL0_HSYNC_ACT_HIGH;
+ if (fb_info->var.sync & FB_SYNC_VERT_HIGH_ACT)
+ vdctrl0 |= VDCTRL0_VSYNC_ACT_HIGH;
+ if (fb_info->var.sync & FB_SYNC_DATA_ENABLE_HIGH_ACT)
+ vdctrl0 |= VDCTRL0_POL_ACTIVE_HIGH;
+
+ writel(vdctrl0, host->base + LCDC_VDCTRL0);
+
+ /* frame length in lines */
+ writel(fb_info->var.upper_margin + fb_info->var.vsync_len +
+ fb_info->var.lower_margin + fb_info->var.yres,
+ host->base + LCDC_VDCTRL1);
+
+ /* line length in units of clocks or pixels */
+ writel(set_hsync_pulse_width(host, fb_info->var.hsync_len) |
+ VDCTRL2_SET_HSYNC_PERIOD(fb_info->var.left_margin +
+ fb_info->var.hsync_len + fb_info->var.right_margin +
+ fb_info->var.xres),
+ host->base + LCDC_VDCTRL2);
+
+ writel(SET_HOR_WAIT_CNT(fb_info->var.left_margin +
+ fb_info->var.hsync_len) |
+ SET_VERT_WAIT_CNT(fb_info->var.upper_margin +
+ fb_info->var.vsync_len),
+ host->base + LCDC_VDCTRL3);
+
+ vdctrl4 = SET_DOTCLK_H_VALID_DATA_CNT(fb_info->var.xres);
+ if (cpu_is_mx28())
+ vdctrl4 |= VDCTRL4_SET_DOTCLK_DLY(host->dotclk_delay);
+ writel(vdctrl4, host->base + LCDC_VDCTRL4);
+
+ writel(fb_info->fix.smem_start +
+ fb_info->fix.line_length * fb_info->var.yoffset,
+ host->base + host->devdata->next_buf);
+
+ if (reenable)
+ mxsfb_enable_controller(fb_info);
+
+ return 0;
+}
+
+static int mxsfb_setcolreg(u_int regno, u_int red, u_int green, u_int blue,
+ u_int transp, struct fb_info *fb_info)
+{
+ unsigned int val;
+ int ret = -EINVAL;
+
+ /*
+ * If greyscale is true, then we convert the RGB value
+ * to greyscale no matter what visual we are using.
+ */
+ if (fb_info->var.grayscale)
+ red = green = blue = (19595 * red + 38470 * green +
+ 7471 * blue) >> 16;
+
+ switch (fb_info->fix.visual) {
+ case FB_VISUAL_TRUECOLOR:
+ /*
+ * 12 or 16-bit True Colour. We encode the RGB value
+ * according to the RGB bitfield information.
+ */
+ if (regno < 16) {
+ u32 *pal = fb_info->pseudo_palette;
+
+ val = chan_to_field(red, &fb_info->var.red);
+ val |= chan_to_field(green, &fb_info->var.green);
+ val |= chan_to_field(blue, &fb_info->var.blue);
+
+ pal[regno] = val;
+ ret = 0;
+ }
+ break;
+
+ case FB_VISUAL_STATIC_PSEUDOCOLOR:
+ case FB_VISUAL_PSEUDOCOLOR:
+ break;
+ }
+
+ return ret;
+}
+
+static int mxsfb_blank(int blank, struct fb_info *fb_info)
+{
+ struct mxsfb_info *host = to_imxfb_host(fb_info);
+
+ switch (blank) {
+ case FB_BLANK_POWERDOWN:
+ case FB_BLANK_VSYNC_SUSPEND:
+ case FB_BLANK_HSYNC_SUSPEND:
+ case FB_BLANK_NORMAL:
+ if (host->enabled)
+ mxsfb_disable_controller(fb_info);
+ break;
+
+ case FB_BLANK_UNBLANK:
+ if (!host->enabled)
+ mxsfb_enable_controller(fb_info);
+ break;
+ }
+ return 0;
+}
+
+static int mxsfb_pan_display(struct fb_var_screeninfo *var,
+ struct fb_info *fb_info)
+{
+ struct mxsfb_info *host = to_imxfb_host(fb_info);
+ unsigned offset;
+
+ if (var->xoffset != 0)
+ return -EINVAL;
+
+ offset = fb_info->fix.line_length * var->yoffset;
+
+ /* update on next VSYNC */
+ writel(fb_info->fix.smem_start + offset,
+ host->base + host->devdata->next_buf);
+
+ return 0;
+}
+
+static struct fb_ops mxsfb_ops = {
+ .owner = THIS_MODULE,
+ .fb_check_var = mxsfb_check_var,
+ .fb_set_par = mxsfb_set_par,
+ .fb_setcolreg = mxsfb_setcolreg,
+ .fb_blank = mxsfb_blank,
+ .fb_pan_display = mxsfb_pan_display,
+ .fb_fillrect = cfb_fillrect,
+ .fb_copyarea = cfb_copyarea,
+ .fb_imageblit = cfb_imageblit,
+};
+
+static int __devinit mxsfb_restore_mode(struct mxsfb_info *host)
+{
+ struct fb_info *fb_info = &host->fb_info;
+ unsigned line_count;
+ unsigned period;
+ unsigned long pa, fbsize;
+ int bits_per_pixel, ofs;
+ u32 transfer_count, vdctrl0, vdctrl2, vdctrl3, vdctrl4, ctrl;
+ struct fb_videomode vmode;
+
+ /* Only restore the mode when the controller is running */
+ ctrl = readl(host->base + LCDC_CTRL);
+ if (!(ctrl & CTRL_RUN))
+ return -EINVAL;
+
+ vdctrl0 = readl(host->base + LCDC_VDCTRL0);
+ vdctrl2 = readl(host->base + LCDC_VDCTRL2);
+ vdctrl3 = readl(host->base + LCDC_VDCTRL3);
+ vdctrl4 = readl(host->base + LCDC_VDCTRL4);
+
+ transfer_count = readl(host->base + host->devdata->transfer_count);
+
+ vmode.xres = TRANSFER_COUNT_GET_HCOUNT(transfer_count);
+ vmode.yres = TRANSFER_COUNT_GET_VCOUNT(transfer_count);
+
+ switch (CTRL_GET_WORD_LENGTH(ctrl)) {
+ case 0:
+ bits_per_pixel = 16;
+ break;
+ case 3:
+ bits_per_pixel = 32;
+ case 1:
+ default:
+ return -EINVAL;
+ }
+
+ fb_info->var.bits_per_pixel = bits_per_pixel;
+
+ vmode.pixclock = KHZ2PICOS(clk_get_rate(host->clk) / 1000U);
+ vmode.hsync_len = get_hsync_pulse_width(host, vdctrl2);
+ vmode.left_margin = GET_HOR_WAIT_CNT(vdctrl3) - vmode.hsync_len;
+ vmode.right_margin = VDCTRL2_GET_HSYNC_PERIOD(vdctrl2) - vmode.hsync_len -
+ vmode.left_margin - vmode.xres;
+ vmode.vsync_len = VDCTRL0_GET_VSYNC_PULSE_WIDTH(vdctrl0);
+ period = readl(host->base + LCDC_VDCTRL1);
+ vmode.upper_margin = GET_VERT_WAIT_CNT(vdctrl3) - vmode.vsync_len;
+ vmode.lower_margin = period - vmode.vsync_len - vmode.upper_margin - vmode.yres;
+
+ vmode.vmode = FB_VMODE_NONINTERLACED;
+
+ vmode.sync = 0;
+ if (vdctrl0 & VDCTRL0_HSYNC_ACT_HIGH)
+ vmode.sync |= FB_SYNC_HOR_HIGH_ACT;
+ if (vdctrl0 & VDCTRL0_VSYNC_ACT_HIGH)
+ vmode.sync |= FB_SYNC_VERT_HIGH_ACT;
+
+ pr_debug("Reconstructed video mode:\n");
+ pr_debug("%dx%d, hsync: %u left: %u, right: %u, vsync: %u, upper: %u, lower: %u\n",
+ vmode.xres, vmode.yres,
+ vmode.hsync_len, vmode.left_margin, vmode.right_margin,
+ vmode.vsync_len, vmode.upper_margin, vmode.lower_margin);
+ pr_debug("pixclk: %ldkHz\n", PICOS2KHZ(vmode.pixclock));
+
+ fb_add_videomode(&vmode, &fb_info->modelist);
+
+ host->ld_intf_width = CTRL_GET_BUS_WIDTH(ctrl);
+ host->dotclk_delay = VDCTRL4_GET_DOTCLK_DLY(vdctrl4);
+
+ fb_info->fix.line_length = vmode.xres * (bits_per_pixel >> 3);
+
+ pa = readl(host->base + host->devdata->cur_buf);
+ fbsize = fb_info->fix.line_length * vmode.yres;
+ if (pa < fb_info->fix.smem_start)
+ return -EINVAL;
+ if (pa + fbsize > fb_info->fix.smem_start + fb_info->fix.smem_len)
+ return -EINVAL;
+ ofs = pa - fb_info->fix.smem_start;
+ if (ofs) {
+ memmove(fb_info->screen_base, fb_info->screen_base + ofs, fbsize);
+ writel(fb_info->fix.smem_start, host->base + host->devdata->next_buf);
+ }
+
+ line_count = fb_info->fix.smem_len / fb_info->fix.line_length;
+ fb_info->fix.ypanstep = 1;
+
+ clk_enable(host->clk);
+ host->enabled = 1;
+
+ return 0;
+}
+
+static int __devinit mxsfb_init_fbinfo(struct mxsfb_info *host)
+{
+ struct fb_info *fb_info = &host->fb_info;
+ struct fb_var_screeninfo *var = &fb_info->var;
+ struct mxsfb_platform_data *pdata = host->pdev->dev.platform_data;
+ dma_addr_t fb_phys;
+ void *fb_virt;
+ unsigned fb_size = pdata->fb_size;
+
+ fb_info->fbops = &mxsfb_ops;
+ fb_info->flags = FBINFO_FLAG_DEFAULT | FBINFO_READS_FAST;
+ strlcpy(fb_info->fix.id, "mxs", sizeof(fb_info->fix.id));
+ fb_info->fix.type = FB_TYPE_PACKED_PIXELS;
+ fb_info->fix.ypanstep = 1;
+ fb_info->fix.visual = FB_VISUAL_TRUECOLOR,
+ fb_info->fix.accel = FB_ACCEL_NONE;
+
+ var->bits_per_pixel = pdata->default_bpp ? pdata->default_bpp : 16;
+ var->nonstd = 0;
+ var->activate = FB_ACTIVATE_NOW;
+ var->accel_flags = 0;
+ var->vmode = FB_VMODE_NONINTERLACED;
+
+ host->dotclk_delay = pdata->dotclk_delay;
+ host->ld_intf_width = pdata->ld_intf_width;
+
+ /* Memory allocation for framebuffer */
+ if (pdata->fb_phys) {
+ if (!fb_size)
+ return -EINVAL;
+
+ fb_phys = pdata->fb_phys;
+
+ if (!request_mem_region(fb_phys, fb_size, host->pdev->name))
+ return -ENOMEM;
+
+ fb_virt = ioremap(fb_phys, fb_size);
+ if (!fb_virt) {
+ release_mem_region(fb_phys, fb_size);
+ return -ENOMEM;
+ }
+ host->mapped = 1;
+ } else {
+ if (!fb_size)
+ fb_size = SZ_2M; /* default */
+ fb_virt = alloc_pages_exact(fb_size, GFP_DMA);
+ if (!fb_info->screen_base)
+ return -ENOMEM;
+
+ fb_phys = virt_to_phys(fb_virt);
+ }
+
+ fb_info->fix.smem_start = fb_phys;
+ fb_info->screen_base = fb_virt;
+ fb_info->screen_size = fb_info->fix.smem_len = fb_size;
+
+ if (mxsfb_restore_mode(host))
+ memset(fb_virt, 0, fb_size);
+
+ return 0;
+}
+
+static void __devexit mxsfb_free_videomem(struct mxsfb_info *host)
+{
+ struct fb_info *fb_info = &host->fb_info;
+
+ if (host->mapped) {
+ iounmap(fb_info->screen_base);
+ release_mem_region(fb_info->fix.smem_start,
+ fb_info->screen_size);
+ } else {
+ free_pages_exact(fb_info->screen_base, fb_info->fix.smem_len);
+ }
+}
+
+static int __devinit mxsfb_probe(struct platform_device *pdev)
+{
+ struct mxsfb_platform_data *pdata = pdev->dev.platform_data;
+ struct resource *res;
+ struct mxsfb_info *host;
+ struct fb_info *fb_info;
+ struct fb_modelist *modelist;
+ int i, ret;
+
+ if (!pdata) {
+ dev_err(&pdev->dev, "No platformdata. Giving up\n");
+ return -ENODEV;
+ }
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ if (!res) {
+ dev_err(&pdev->dev, "Cannot get memory IO resource\n");
+ return -ENODEV;
+ }
+
+ if (!request_mem_region(res->start, resource_size(res), pdev->name))
+ return -EBUSY;
+
+ fb_info = framebuffer_alloc(sizeof(struct mxsfb_info), &pdev->dev);
+ if (!fb_info) {
+ dev_err(&pdev->dev, "Failed to allocate fbdev\n");
+ ret = -ENOMEM;
+ goto error_alloc_info;
+ }
+
+ host = to_imxfb_host(fb_info);
+
+ host->base = ioremap(res->start, resource_size(res));
+ if (!host->base) {
+ dev_err(&pdev->dev, "ioremap failed\n");
+ ret = -ENOMEM;
+ goto error_ioremap;
+ }
+
+ host->pdev = pdev;
+ platform_set_drvdata(pdev, host);
+
+ host->devdata = &mxsfb_devdata[pdev->id_entry->driver_data];
+
+ host->clk = clk_get(&host->pdev->dev, NULL);
+ if (IS_ERR(host->clk)) {
+ ret = PTR_ERR(host->clk);
+ goto error_getclock;
+ }
+
+ fb_info->pseudo_palette = kmalloc(sizeof(u32) * 16, GFP_KERNEL);
+ if (!fb_info->pseudo_palette) {
+ ret = -ENOMEM;
+ goto error_pseudo_pallette;
+ }
+
+ INIT_LIST_HEAD(&fb_info->modelist);
+
+ ret = mxsfb_init_fbinfo(host);
+ if (ret != 0)
+ goto error_init_fb;
+
+ for (i = 0; i < pdata->mode_count; i++)
+ fb_add_videomode(&pdata->mode_list[i], &fb_info->modelist);
+
+ modelist = list_first_entry(&fb_info->modelist,
+ struct fb_modelist, list);
+ fb_videomode_to_var(&fb_info->var, &modelist->mode);
+
+ /* init the color fields */
+ mxsfb_check_var(&fb_info->var, fb_info);
+
+ platform_set_drvdata(pdev, fb_info);
+
+ ret = register_framebuffer(fb_info);
+ if (ret != 0) {
+ dev_err(&pdev->dev,"Failed to register framebuffer\n");
+ goto error_register;
+ }
+
+ if (!host->enabled) {
+ writel(0, host->base + LCDC_CTRL);
+ mxsfb_set_par(fb_info);
+ mxsfb_enable_controller(fb_info);
+ }
+
+ return 0;
+
+error_register:
+ if (host->enabled)
+ clk_disable(host->clk);
+ fb_destroy_modelist(&fb_info->modelist);
+error_init_fb:
+ kfree(fb_info->pseudo_palette);
+error_pseudo_pallette:
+ clk_put(host->clk);
+error_getclock:
+ iounmap(host->base);
+error_ioremap:
+ framebuffer_release(fb_info);
+error_alloc_info:
+ release_mem_region(res->start, resource_size(res));
+
+ return ret;
+}
+
+static int __devexit mxsfb_remove(struct platform_device *pdev)
+{
+ struct fb_info *fb_info = platform_get_drvdata(pdev);
+ struct mxsfb_info *host = to_imxfb_host(fb_info);
+ struct resource *res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+
+ if (host->enabled)
+ mxsfb_disable_controller(fb_info);
+
+ unregister_framebuffer(fb_info);
+ kfree(fb_info->pseudo_palette);
+ mxsfb_free_videomem(host);
+ iounmap(host->base);
+ clk_put(host->clk);
+
+ framebuffer_release(fb_info);
+ release_mem_region(res->start, resource_size(res));
+
+ platform_set_drvdata(pdev, NULL);
+
+ return 0;
+}
+
+static struct platform_device_id mxsfb_devtype[] = {
+ {
+ .name = "imx23-fb",
+ .driver_data = MXSFB_MX23,
+ }, {
+ .name = "imx28-fb",
+ .driver_data = MXSFB_MX28,
+ }, {
+ },
+};
+MODULE_DEVICE_TABLE(platform, mxsfb_devtype);
+
+static struct platform_driver mxsfb_driver = {
+ .probe = mxsfb_probe,
+ .remove = __devexit_p(mxsfb_remove),
+ .id_table = mxsfb_devtype,
+ .driver = {
+ .name = DRIVER_NAME,
+ },
+};
+
+static int __init mxsfb_init(void)
+{
+ return platform_driver_register(&mxsfb_driver);
+}
+
+static void __exit mxsfb_exit(void)
+{
+ platform_driver_unregister(&mxsfb_driver);
+}
+
+module_init(mxsfb_init);
+module_exit(mxsfb_exit);
+
+MODULE_DESCRIPTION("Freescale mxs framebuffer driver");
+MODULE_AUTHOR("Sascha Hauer, Pengutronix");
+MODULE_LICENSE("GPL");
--
1.7.2.3
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