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Message-ID: <DE2504B3A515524BBE6934369EFDC0DA06FBD5E8@az33exm20.fsl.freescale.net>
Date: Wed, 10 Dec 2008 09:23:20 -0700
From: "Herring Robert" <R.Herring@...escale.com>
To: "Guennadi Liakhovetski" <g.liakhovetski@....de>
Cc: <linux-fbdev-devel@...ts.sourceforge.net>, <adaplas@...il.com>,
"Sascha Hauer" <s.hauer@...gutronix.de>,
<linux-arm-kernel@...ts.arm.linux.org.uk>,
"Dan Williams" <dan.j.williams@...el.com>,
<linux-kernel@...r.kernel.org>
Subject: RE: [PATCH 3/4 v2] i.MX31: framebuffer driver
You have obviously started with Freescale copyrighted GPL code, but you
have not given credit or maintained our copyrights.
The way you have structured the code moving the low-level SDC setup to
the framebuffer will cause problems. There are lots of inter-module
dependencies that have to be handled in the correct order to avoid
hanging the h/w. For example, the SDC BG_EN has to be cleared before
disabling the IDMA channel. This structure will also not allow reuse of
framebuffer, camera, and v4l2 output drivers with the next version of
h/w.
Regards,
Rob
> -----Original Message-----
> From: linux-arm-kernel-bounces@...ts.arm.linux.org.uk
> [mailto:linux-arm-kernel-bounces@...ts.arm.linux.org.uk] On
> Behalf Of Guennadi Liakhovetski
> Sent: Wednesday, December 10, 2008 4:36 AM
> To: linux-kernel@...r.kernel.org
> Cc: linux-fbdev-devel@...ts.sourceforge.net;
> adaplas@...il.com; Sascha Hauer;
> linux-arm-kernel@...ts.arm.linux.org.uk; Dan Williams
> Subject: [PATCH 3/4 v2] i.MX31: framebuffer driver
>
> From: Guennadi Liakhovetski <g.liakhovetski@....de>
>
> This is a framebuffer driver for i.MX31 SoCs. It only
> supports synchronous
> displays, overlay support is included but has never been
> tested, similarly
> panning hasn't been tested.
>
> Signed-off-by: Guennadi Liakhovetski <lg@...x.de>
> ---
> arch/arm/plat-mxc/include/mach/mx3fb.h | 38 +
> drivers/video/Kconfig | 12 +
> drivers/video/Makefile | 1 +
> drivers/video/mx3fb.c | 1843
> ++++++++++++++++++++++++++++++++
> 4 files changed, 1894 insertions(+), 0 deletions(-)
> create mode 100644 arch/arm/plat-mxc/include/mach/mx3fb.h
> create mode 100644 drivers/video/mx3fb.c
>
> diff --git a/arch/arm/plat-mxc/include/mach/mx3fb.h
> b/arch/arm/plat-mxc/include/mach/mx3fb.h
> new file mode 100644
> index 0000000..91f03a4
> --- /dev/null
> +++ b/arch/arm/plat-mxc/include/mach/mx3fb.h
> @@ -0,0 +1,38 @@
> +/*
> + * Copyright (C) 2008
> + * Guennadi Liakhovetski, DENX Software Engineering, <lg@...x.de>
> + *
> + * 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.
> + */
> +
> +#ifndef __ASM_ARCH_MX3FB_H__
> +#define __ASM_ARCH_MX3FB_H__
> +
> +#include <linux/device.h>
> +#include <linux/fb.h>
> +
> +/* Proprietary FB_SYNC_ flags */
> +#define FB_SYNC_OE_ACT_HIGH 0x80000000
> +#define FB_SYNC_CLK_INVERT 0x40000000
> +#define FB_SYNC_DATA_INVERT 0x20000000
> +#define FB_SYNC_CLK_IDLE_EN 0x10000000
> +#define FB_SYNC_SHARP_MODE 0x08000000
> +#define FB_SYNC_SWAP_RGB 0x04000000
> +#define FB_SYNC_CLK_SEL_EN 0x02000000
> +
> +/**
> + * @dma_dev pointer to the dma-device, used for dma-slave connection
> + * @mode pointer to a platform-provided per
> mxc_register_fb() videomode
> + */
> +struct mx3fb_platform_data {
> + struct device *dma_dev;
> + const char *name;
> + const struct fb_videomode *mode;
> + int num_modes;
> +};
> +
> +extern int mx3_register_fb(const char *, const struct
> fb_videomode *, int);
> +
> +#endif
> diff --git a/drivers/video/Kconfig b/drivers/video/Kconfig
> index 5611a4f..cd9a8c2 100644
> --- a/drivers/video/Kconfig
> +++ b/drivers/video/Kconfig
> @@ -2117,6 +2117,18 @@ config FB_PRE_INIT_FB
> Select this option if display contents should be
> inherited as set by
> the bootloader.
>
> +config FB_MX3
> + tristate "MX3 Framebuffer support"
> + depends on FB && MX3_IPU
> + select FB_CFB_FILLRECT
> + select FB_CFB_COPYAREA
> + select FB_CFB_IMAGEBLIT
> + default y
> + help
> + This is a framebuffer device for the i.MX31 LCD Controller. So
> + far only synchronous displays are supported. If you
> plan to use
> + an LCD display with your i.MX31 system, say Y here.
> +
> source "drivers/video/omap/Kconfig"
>
> source "drivers/video/backlight/Kconfig"
> diff --git a/drivers/video/Makefile b/drivers/video/Makefile
> index e39e33e..8953190 100644
> --- a/drivers/video/Makefile
> +++ b/drivers/video/Makefile
> @@ -132,6 +132,7 @@ obj-$(CONFIG_FB_VGA16) += vga16fb.o
> obj-$(CONFIG_FB_OF) += offb.o
> obj-$(CONFIG_FB_BF54X_LQ043) += bf54x-lq043fb.o
> obj-$(CONFIG_FB_BFIN_T350MCQB) += bfin-t350mcqb-fb.o
> +obj-$(CONFIG_FB_MX3) += mx3fb.o
>
> # the test framebuffer is last
> obj-$(CONFIG_FB_VIRTUAL) += vfb.o
> diff --git a/drivers/video/mx3fb.c b/drivers/video/mx3fb.c
> new file mode 100644
> index 0000000..e8084ae
> --- /dev/null
> +++ b/drivers/video/mx3fb.c
> @@ -0,0 +1,1843 @@
> +/*
> + * Copyright (C) 2008
> + * Guennadi Liakhovetski, DENX Software Engineering, <lg@...x.de>
> + *
> + * Copyright 2004-2007 Freescale Semiconductor, 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 version 2 as
> + * published by the Free Software Foundation.
> + */
> +
> +#include <linux/module.h>
> +#include <linux/kernel.h>
> +#include <linux/platform_device.h>
> +#include <linux/sched.h>
> +#include <linux/errno.h>
> +#include <linux/string.h>
> +#include <linux/interrupt.h>
> +#include <linux/slab.h>
> +#include <linux/fb.h>
> +#include <linux/delay.h>
> +#include <linux/init.h>
> +#include <linux/ioport.h>
> +#include <linux/dma-mapping.h>
> +#include <linux/dmaengine.h>
> +#include <linux/console.h>
> +#include <linux/clk.h>
> +#include <linux/mutex.h>
> +
> +#include <mach/hardware.h>
> +#include <mach/ipu.h>
> +#include <mach/mx3fb.h>
> +
> +#include <asm/io.h>
> +#include <asm/uaccess.h>
> +
> +#define MX3FB_NAME "mx3_sdc_fb"
> +
> +#define MX3FB_REG_OFFSET 0xB4
> +
> +/* SDC Registers */
> +#define SDC_COM_CONF (0xB4 - MX3FB_REG_OFFSET)
> +#define SDC_GW_CTRL (0xB8 - MX3FB_REG_OFFSET)
> +#define SDC_FG_POS (0xBC - MX3FB_REG_OFFSET)
> +#define SDC_BG_POS (0xC0 - MX3FB_REG_OFFSET)
> +#define SDC_CUR_POS (0xC4 - MX3FB_REG_OFFSET)
> +#define SDC_PWM_CTRL (0xC8 - MX3FB_REG_OFFSET)
> +#define SDC_CUR_MAP (0xCC - MX3FB_REG_OFFSET)
> +#define SDC_HOR_CONF (0xD0 - MX3FB_REG_OFFSET)
> +#define SDC_VER_CONF (0xD4 - MX3FB_REG_OFFSET)
> +#define SDC_SHARP_CONF_1 (0xD8 - MX3FB_REG_OFFSET)
> +#define SDC_SHARP_CONF_2 (0xDC - MX3FB_REG_OFFSET)
> +
> +/* Register bits */
> +#define SDC_COM_TFT_COLOR 0x00000001UL
> +#define SDC_COM_FG_EN 0x00000010UL
> +#define SDC_COM_GWSEL 0x00000020UL
> +#define SDC_COM_GLB_A 0x00000040UL
> +#define SDC_COM_KEY_COLOR_G 0x00000080UL
> +#define SDC_COM_BG_EN 0x00000200UL
> +#define SDC_COM_SHARP 0x00001000UL
> +
> +#define SDC_V_SYNC_WIDTH_L 0x00000001UL
> +
> +/* Display Interface registers */
> +#define DI_DISP_IF_CONF (0x0124 - MX3FB_REG_OFFSET)
> +#define DI_DISP_SIG_POL (0x0128 - MX3FB_REG_OFFSET)
> +#define DI_SER_DISP1_CONF (0x012C - MX3FB_REG_OFFSET)
> +#define DI_SER_DISP2_CONF (0x0130 - MX3FB_REG_OFFSET)
> +#define DI_HSP_CLK_PER (0x0134 - MX3FB_REG_OFFSET)
> +#define DI_DISP0_TIME_CONF_1 (0x0138 - MX3FB_REG_OFFSET)
> +#define DI_DISP0_TIME_CONF_2 (0x013C - MX3FB_REG_OFFSET)
> +#define DI_DISP0_TIME_CONF_3 (0x0140 - MX3FB_REG_OFFSET)
> +#define DI_DISP1_TIME_CONF_1 (0x0144 - MX3FB_REG_OFFSET)
> +#define DI_DISP1_TIME_CONF_2 (0x0148 - MX3FB_REG_OFFSET)
> +#define DI_DISP1_TIME_CONF_3 (0x014C - MX3FB_REG_OFFSET)
> +#define DI_DISP2_TIME_CONF_1 (0x0150 - MX3FB_REG_OFFSET)
> +#define DI_DISP2_TIME_CONF_2 (0x0154 - MX3FB_REG_OFFSET)
> +#define DI_DISP2_TIME_CONF_3 (0x0158 - MX3FB_REG_OFFSET)
> +#define DI_DISP3_TIME_CONF (0x015C - MX3FB_REG_OFFSET)
> +#define DI_DISP0_DB0_MAP (0x0160 - MX3FB_REG_OFFSET)
> +#define DI_DISP0_DB1_MAP (0x0164 - MX3FB_REG_OFFSET)
> +#define DI_DISP0_DB2_MAP (0x0168 - MX3FB_REG_OFFSET)
> +#define DI_DISP0_CB0_MAP (0x016C - MX3FB_REG_OFFSET)
> +#define DI_DISP0_CB1_MAP (0x0170 - MX3FB_REG_OFFSET)
> +#define DI_DISP0_CB2_MAP (0x0174 - MX3FB_REG_OFFSET)
> +#define DI_DISP1_DB0_MAP (0x0178 - MX3FB_REG_OFFSET)
> +#define DI_DISP1_DB1_MAP (0x017C - MX3FB_REG_OFFSET)
> +#define DI_DISP1_DB2_MAP (0x0180 - MX3FB_REG_OFFSET)
> +#define DI_DISP1_CB0_MAP (0x0184 - MX3FB_REG_OFFSET)
> +#define DI_DISP1_CB1_MAP (0x0188 - MX3FB_REG_OFFSET)
> +#define DI_DISP1_CB2_MAP (0x018C - MX3FB_REG_OFFSET)
> +#define DI_DISP2_DB0_MAP (0x0190 - MX3FB_REG_OFFSET)
> +#define DI_DISP2_DB1_MAP (0x0194 - MX3FB_REG_OFFSET)
> +#define DI_DISP2_DB2_MAP (0x0198 - MX3FB_REG_OFFSET)
> +#define DI_DISP2_CB0_MAP (0x019C - MX3FB_REG_OFFSET)
> +#define DI_DISP2_CB1_MAP (0x01A0 - MX3FB_REG_OFFSET)
> +#define DI_DISP2_CB2_MAP (0x01A4 - MX3FB_REG_OFFSET)
> +#define DI_DISP3_B0_MAP (0x01A8 - MX3FB_REG_OFFSET)
> +#define DI_DISP3_B1_MAP (0x01AC - MX3FB_REG_OFFSET)
> +#define DI_DISP3_B2_MAP (0x01B0 - MX3FB_REG_OFFSET)
> +#define DI_DISP_ACC_CC (0x01B4 - MX3FB_REG_OFFSET)
> +#define DI_DISP_LLA_CONF (0x01B8 - MX3FB_REG_OFFSET)
> +#define DI_DISP_LLA_DATA (0x01BC - MX3FB_REG_OFFSET)
> +
> +/* DI_DISP_SIG_POL bits */
> +#define DI_D3_VSYNC_POL_SHIFT 28
> +#define DI_D3_HSYNC_POL_SHIFT 27
> +#define DI_D3_DRDY_SHARP_POL_SHIFT 26
> +#define DI_D3_CLK_POL_SHIFT 25
> +#define DI_D3_DATA_POL_SHIFT 24
> +
> +/* DI_DISP_IF_CONF bits */
> +#define DI_D3_CLK_IDLE_SHIFT 26
> +#define DI_D3_CLK_SEL_SHIFT 25
> +#define DI_D3_DATAMSK_SHIFT 24
> +
> +enum ipu_panel {
> + IPU_PANEL_SHARP_TFT,
> + IPU_PANEL_TFT,
> +};
> +
> +struct ipu_di_signal_cfg {
> + unsigned datamask_en:1;
> + unsigned clksel_en:1;
> + unsigned clkidle_en:1;
> + unsigned data_pol:1; /* true = inverted */
> + unsigned clk_pol:1; /* true = rising edge */
> + unsigned enable_pol:1;
> + unsigned Hsync_pol:1; /* true = active high */
> + unsigned Vsync_pol:1;
> +};
> +
> +static const struct fb_videomode mx3fb_modedb[] = {
> + {
> + /* 240x320 @ 60 Hz */
> + .name = "Sharp-QVGA",
> + .refresh = 60,
> + .xres = 240,
> + .yres = 320,
> + .pixclock = 185925,
> + .left_margin = 9,
> + .right_margin = 16,
> + .upper_margin = 7,
> + .lower_margin = 9,
> + .hsync_len = 1,
> + .vsync_len = 1,
> + .sync = FB_SYNC_HOR_HIGH_ACT |
> FB_SYNC_SHARP_MODE |
> + FB_SYNC_CLK_INVERT |
> FB_SYNC_DATA_INVERT |
> + FB_SYNC_CLK_IDLE_EN,
> + .vmode = FB_VMODE_NONINTERLACED,
> + .flag = 0,
> + }, {
> + /* 240x33 @ 60 Hz */
> + .name = "Sharp-CLI",
> + .refresh = 60,
> + .xres = 240,
> + .yres = 33,
> + .pixclock = 185925,
> + .left_margin = 9,
> + .right_margin = 16,
> + .upper_margin = 7,
> + .lower_margin = 9 + 287,
> + .hsync_len = 1,
> + .vsync_len = 1,
> + .sync = FB_SYNC_HOR_HIGH_ACT |
> FB_SYNC_SHARP_MODE |
> + FB_SYNC_CLK_INVERT |
> FB_SYNC_DATA_INVERT |
> + FB_SYNC_CLK_IDLE_EN,
> + .vmode = FB_VMODE_NONINTERLACED,
> + .flag = 0,
> + }, {
> + /* 640x480 @ 60 Hz */
> + .name = "NEC-VGA",
> + .refresh = 60,
> + .xres = 640,
> + .yres = 480,
> + .pixclock = 38255,
> + .left_margin = 144,
> + .right_margin = 0,
> + .upper_margin = 34,
> + .lower_margin = 40,
> + .hsync_len = 1,
> + .vsync_len = 1,
> + .sync = FB_SYNC_VERT_HIGH_ACT |
> FB_SYNC_OE_ACT_HIGH,
> + .vmode = FB_VMODE_NONINTERLACED,
> + .flag = 0,
> + }, {
> + /* NTSC TV output */
> + .name = "TV-NTSC",
> + .refresh = 60,
> + .xres = 640,
> + .yres = 480,
> + .pixclock = 37538,
> + .left_margin = 38,
> + .right_margin = 858 - 640 - 38 - 3,
> + .upper_margin = 36,
> + .lower_margin = 518 - 480 - 36 - 1,
> + .hsync_len = 3,
> + .vsync_len = 1,
> + .sync = 0,
> + .vmode = FB_VMODE_NONINTERLACED,
> + .flag = 0,
> + }, {
> + /* PAL TV output */
> + .name = "TV-PAL",
> + .refresh = 50,
> + .xres = 640,
> + .yres = 480,
> + .pixclock = 37538,
> + .left_margin = 38,
> + .right_margin = 960 - 640 - 38 - 32,
> + .upper_margin = 32,
> + .lower_margin = 555 - 480 - 32 - 3,
> + .hsync_len = 32,
> + .vsync_len = 3,
> + .sync = 0,
> + .vmode = FB_VMODE_NONINTERLACED,
> + .flag = 0,
> + }, {
> + /* TV output VGA mode, 640x480 @ 65 Hz */
> + .name = "TV-VGA",
> + .refresh = 60,
> + .xres = 640,
> + .yres = 480,
> + .pixclock = 40574,
> + .left_margin = 35,
> + .right_margin = 45,
> + .upper_margin = 9,
> + .lower_margin = 1,
> + .hsync_len = 46,
> + .vsync_len = 5,
> + .sync = 0,
> + .vmode = FB_VMODE_NONINTERLACED,
> + .flag = 0,
> + },
> +};
> +
> +struct mx3fb_data {
> + struct fb_info *fbi;
> + struct fb_info *fbi_ovl;
> + int backlight_level;
> + void __iomem *reg_base;
> + spinlock_t lock;
> + struct device *dev;
> +
> + uint32_t h_start_width;
> + uint32_t v_start_width;
> +
> + /* IDMAC / dmaengine interface */
> + struct idmac_channel *idmac_channel[2]; /* We
> need 2 channels */
> +};
> +
> +struct dma_chan_request {
> + struct mx3fb_data *mx3fb;
> + enum ipu_channel id;
> +};
> +
> +/* MX3 specific framebuffer information. */
> +struct mx3fb_info {
> + int blank;
> + enum ipu_channel ipu_ch;
> + uint32_t cur_ipu_buf;
> +
> + u32 pseudo_palette[16];
> +
> + struct completion flip_cmpl;
> + struct mutex mutex; /*
> Protects fb-ops */
> + struct mx3fb_data *mx3fb;
> + struct idmac_channel *idmac_channel;
> + struct dma_async_tx_descriptor *txd;
> + dma_cookie_t cookie;
> + struct scatterlist sg[2];
> +};
> +
> +/* Allocated overlay buffer */
> +struct mx3fb_alloc_list {
> + struct list_head list;
> + dma_addr_t phy_addr;
> + void *cpu_addr;
> + size_t size;
> +};
> +
> +/* A list of overlay buffers */
> +static LIST_HEAD(fb_alloc_list);
> +
> +/* Used fb-mode and bpp. Can be set on kernel command line,
> therefore file-static. */
> +static const char *fb_mode;
> +static unsigned long default_bpp = 16;
> +
> +static u32 mx3fb_read_reg(struct mx3fb_data *mx3fb, unsigned
> long reg)
> +{
> + return __raw_readl(mx3fb->reg_base + reg);
> +}
> +
> +static void mx3fb_write_reg(struct mx3fb_data *mx3fb, u32
> value, unsigned long reg)
> +{
> + __raw_writel(value, mx3fb->reg_base + reg);
> +}
> +
> +static const uint32_t di_mappings[] = {
> + 0x1600AAAA, 0x00E05555, 0x00070000, 3, /* RGB888 */
> + 0x0005000F, 0x000B000F, 0x0011000F, 1, /* RGB666 */
> + 0x0011000F, 0x000B000F, 0x0005000F, 1, /* BGR666 */
> + 0x0004003F, 0x000A000F, 0x000F003F, 1 /* RGB565 */
> +};
> +
> +static void sdc_fb_init(struct mx3fb_info *fbi)
> +{
> + struct mx3fb_data *mx3fb = fbi->mx3fb;
> + uint32_t reg;
> +
> + reg = mx3fb_read_reg(mx3fb, SDC_COM_CONF);
> +
> + /* Also enable foreground for overlay */
> + if (mx3fb->fbi_ovl && fbi == mx3fb->fbi_ovl->par)
> + reg |= SDC_COM_FG_EN;
> +
> + mx3fb_write_reg(mx3fb, reg | SDC_COM_BG_EN, SDC_COM_CONF);
> +}
> +
> +/* Returns enabled flag before uninit */
> +static uint32_t sdc_fb_uninit(struct mx3fb_info *fbi)
> +{
> + struct mx3fb_data *mx3fb = fbi->mx3fb;
> + uint32_t reg, chan_mask;
> +
> + reg = mx3fb_read_reg(mx3fb, SDC_COM_CONF);
> +
> + /*
> + * Don't we have to automatically disable overlay when disabling
> + * background? Attention: cannot test mx3fb->fbi_ovl->par, must
> + * test mx3fb->fbi->par, because at the time this function is
> + * called for the first time fbi_ovl is not assigned yet.
> + */
> + if (fbi == mx3fb->fbi->par)
> + chan_mask = SDC_COM_BG_EN;
> + else
> + chan_mask = SDC_COM_FG_EN;
> +
> + mx3fb_write_reg(mx3fb, reg & ~chan_mask, SDC_COM_CONF);
> +
> + return reg & chan_mask;
> +}
> +
> +static void sdc_enable_channel(struct mx3fb_info *mxc_fbi)
> +{
> + struct mx3fb_data *mx3fb = mxc_fbi->mx3fb;
> + struct idmac_channel *ichan = mxc_fbi->idmac_channel;
> + struct dma_chan *dma_chan = &ichan->dma_chan;
> + unsigned long flags;
> + dma_cookie_t cookie;
> +
> + if (!mxc_fbi->txd || !mxc_fbi->txd->tx_submit)
> + return;
> +
> + dev_dbg(mx3fb->dev, "mx3fbi %p, desc %p, sg %p\n", mxc_fbi,
> + to_tx_desc(mxc_fbi->txd), to_tx_desc(mxc_fbi->txd)->sg);
> +
> + /* This enables the channel */
> + if (mxc_fbi->cookie < 0) {
> + cookie = mxc_fbi->txd->tx_submit(mxc_fbi->txd);
> + } else {
> + /* Just re-activate the same buffer */
> + dma_async_issue_pending(dma_chan);
> + cookie = mxc_fbi->cookie;
> + }
> +
> + if (cookie >= 0) {
> + spin_lock_irqsave(&mx3fb->lock, flags);
> + sdc_fb_init(mxc_fbi);
> + mxc_fbi->cookie = cookie;
> + spin_unlock_irqrestore(&mx3fb->lock, flags);
> + }
> +
> + /*
> + * Attention! Without this msleep the channel keeps generating
> + * interrupts. Next sdc_set_brightness() is going to be called
> + * from mx3fb_blank().
> + */
> + msleep(2);
> +}
> +
> +static void sdc_disable_channel(struct mx3fb_info *mxc_fbi)
> +{
> + struct mx3fb_data *mx3fb = mxc_fbi->mx3fb;
> + uint32_t enabled;
> + unsigned long flags;
> +
> + spin_lock_irqsave(&mx3fb->lock, flags);
> +
> + enabled = sdc_fb_uninit(mxc_fbi);
> +
> + spin_unlock_irqrestore(&mx3fb->lock, flags);
> +
> +
> mxc_fbi->txd->chan->device->device_terminate_all(mxc_fbi->txd->chan);
> +}
> +
> +/**
> + * Set the window position of the foreground or background
> plane modes.
> + *
> + * @param channel Input parameter for the
> logical channel ID.
> + * @param x_pos The X coordinate position to
> place window at.
> + * The position is relative to
> the top left corner.
> + * @param y_pos The Y coordinate position to
> place window at.
> + * The position is relative to
> the top left corner.
> + * @return This function returns 0 on success or
> negative error code on fail
> + */
> +static int sdc_set_window_pos(struct mx3fb_data *mx3fb, enum
> ipu_channel channel,
> + int16_t x_pos, int16_t y_pos)
> +{
> + x_pos += mx3fb->h_start_width;
> + y_pos += mx3fb->v_start_width;
> +
> + switch (channel) {
> + case IDMAC_SDC_0:
> + mx3fb_write_reg(mx3fb, (x_pos << 16) | y_pos,
> SDC_BG_POS);
> + break;
> + case IDMAC_SDC_1:
> + mx3fb_write_reg(mx3fb, (x_pos << 16) | y_pos,
> SDC_FG_POS);
> + break;
> + default:
> + return -EINVAL;
> + }
> + return 0;
> +}
> +
> +/**
> + * Initialize a synchronous LCD panel.
> + *
> + * @param panel The type of panel.
> + * @param pixel_clk Desired pixel clock frequency in Hz.
> + * @param pixel_fmt Input parameter for pixel
> format of buffer. Pixel
> + * format is a FOURCC ASCII code.
> + * @param width The width of panel in pixels.
> + * @param height The height of panel in pixels.
> + * @param hStartWidth The number of pixel clocks
> between the HSYNC
> + * signal pulse and the start
> of valid data.
> + * @param hSyncWidth The width of the HSYNC
> signal in units of pixel
> + * clocks.
> + * @param hEndWidth The number of pixel clocks
> between the end of
> + * valid data and the HSYNC
> signal for next line.
> + * @param vStartWidth The number of lines between the VSYNC
> + * signal pulse and the start
> of valid data.
> + * @param vSyncWidth The width of the VSYNC
> signal in units of lines
> + * @param vEndWidth The number of lines between
> the end of valid
> + * data and the VSYNC signal
> for next frame.
> + * @param sig Bitfield of signal
> polarities for LCD interface.
> + * @return This function returns 0 on success or
> negative error code on
> + * fail.
> + */
> +static int sdc_init_panel(struct mx3fb_data *mx3fb, enum
> ipu_panel panel,
> + uint32_t pixel_clk,
> + uint16_t width, uint16_t height,
> + enum pixel_fmt pixel_fmt,
> + uint16_t h_start_width, uint16_t h_sync_width,
> + uint16_t h_end_width, uint16_t v_start_width,
> + uint16_t v_sync_width, uint16_t v_end_width,
> + struct ipu_di_signal_cfg sig)
> +{
> + unsigned long lock_flags;
> + uint32_t reg;
> + uint32_t old_conf;
> + uint32_t div;
> + struct clk *ipu_clk;
> +
> + dev_dbg(mx3fb->dev, "panel size = %d x %d", width, height);
> +
> + if (v_sync_width == 0 || h_sync_width == 0)
> + return -EINVAL;
> +
> + /* Init panel size and blanking periods */
> + reg = ((uint32_t) (h_sync_width - 1) << 26) |
> + ((uint32_t) (width + h_start_width +
> h_end_width - 1) << 16);
> + mx3fb_write_reg(mx3fb, reg, SDC_HOR_CONF);
> +
> + printk(" hor_conf %x,", reg);
> +
> + reg = ((uint32_t) (v_sync_width - 1) << 26) |
> SDC_V_SYNC_WIDTH_L |
> + ((uint32_t) (height + v_start_width + v_end_width -
> 1) << 16);
> + mx3fb_write_reg(mx3fb, reg, SDC_VER_CONF);
> +
> + printk(" ver_conf %x\n", reg);
> +
> + mx3fb->h_start_width = h_start_width;
> + mx3fb->v_start_width = v_start_width;
> +
> + switch (panel) {
> + case IPU_PANEL_SHARP_TFT:
> + mx3fb_write_reg(mx3fb, 0x00FD0102L, SDC_SHARP_CONF_1);
> + mx3fb_write_reg(mx3fb, 0x00F500F4L, SDC_SHARP_CONF_2);
> + mx3fb_write_reg(mx3fb, SDC_COM_SHARP |
> SDC_COM_TFT_COLOR, SDC_COM_CONF);
> + break;
> + case IPU_PANEL_TFT:
> + mx3fb_write_reg(mx3fb, SDC_COM_TFT_COLOR, SDC_COM_CONF);
> + break;
> + default:
> + return -EINVAL;
> + }
> +
> + /* Init clocking */
> +
> + /*
> + * Calculate divider: fractional part is 4 bits so
> simply multiple by
> + * 2^4 to get fractional part, as long as we stay under
> ~250MHz and on
> + * i.MX31 it (HSP_CLK) is <= 178MHz. Currently 128.267MHz
> + */
> + dev_dbg(mx3fb->dev, "pixel clk = %d\n", pixel_clk);
> +
> + ipu_clk = clk_get(mx3fb->dev, "ipu_clk");
> + div = clk_get_rate(ipu_clk) * 16 / pixel_clk;
> + clk_put(ipu_clk);
> +
> + if (div < 0x40) { /* Divider less than 4 */
> + dev_dbg(mx3fb->dev,
> + "InitPanel() - Pixel clock divider less
> than 4\n");
> + div = 0x40;
> + }
> +
> + spin_lock_irqsave(&mx3fb->lock, lock_flags);
> +
> + /*
> + * DISP3_IF_CLK_DOWN_WR is half the divider value and 2
> fraction bits
> + * fewer. Subtract 1 extra from DISP3_IF_CLK_DOWN_WR
> based on timing
> + * debug. DISP3_IF_CLK_UP_WR is 0
> + */
> + mx3fb_write_reg(mx3fb, (((div / 8) - 1) << 22) | div,
> DI_DISP3_TIME_CONF);
> +
> + /* DI settings */
> + old_conf = mx3fb_read_reg(mx3fb, DI_DISP_IF_CONF) & 0x78FFFFFF;
> + old_conf |= sig.datamask_en << DI_D3_DATAMSK_SHIFT |
> + sig.clksel_en << DI_D3_CLK_SEL_SHIFT |
> + sig.clkidle_en << DI_D3_CLK_IDLE_SHIFT;
> + mx3fb_write_reg(mx3fb, old_conf, DI_DISP_IF_CONF);
> +
> + old_conf = mx3fb_read_reg(mx3fb, DI_DISP_SIG_POL) & 0xE0FFFFFF;
> + old_conf |= sig.data_pol << DI_D3_DATA_POL_SHIFT |
> + sig.clk_pol << DI_D3_CLK_POL_SHIFT |
> + sig.enable_pol << DI_D3_DRDY_SHARP_POL_SHIFT |
> + sig.Hsync_pol << DI_D3_HSYNC_POL_SHIFT |
> + sig.Vsync_pol << DI_D3_VSYNC_POL_SHIFT;
> + mx3fb_write_reg(mx3fb, old_conf, DI_DISP_SIG_POL);
> +
> + switch (pixel_fmt) {
> + case IPU_PIX_FMT_RGB24:
> + mx3fb_write_reg(mx3fb, di_mappings[0], DI_DISP3_B0_MAP);
> + mx3fb_write_reg(mx3fb, di_mappings[1], DI_DISP3_B1_MAP);
> + mx3fb_write_reg(mx3fb, di_mappings[2], DI_DISP3_B2_MAP);
> + mx3fb_write_reg(mx3fb, mx3fb_read_reg(mx3fb,
> DI_DISP_ACC_CC) |
> + ((di_mappings[3] - 1) << 12),
> DI_DISP_ACC_CC);
> + break;
> + case IPU_PIX_FMT_RGB666:
> + mx3fb_write_reg(mx3fb, di_mappings[4], DI_DISP3_B0_MAP);
> + mx3fb_write_reg(mx3fb, di_mappings[5], DI_DISP3_B1_MAP);
> + mx3fb_write_reg(mx3fb, di_mappings[6], DI_DISP3_B2_MAP);
> + mx3fb_write_reg(mx3fb, mx3fb_read_reg(mx3fb,
> DI_DISP_ACC_CC) |
> + ((di_mappings[7] - 1) << 12),
> DI_DISP_ACC_CC);
> + break;
> + case IPU_PIX_FMT_BGR666:
> + mx3fb_write_reg(mx3fb, di_mappings[8], DI_DISP3_B0_MAP);
> + mx3fb_write_reg(mx3fb, di_mappings[9], DI_DISP3_B1_MAP);
> + mx3fb_write_reg(mx3fb, di_mappings[10],
> DI_DISP3_B2_MAP);
> + mx3fb_write_reg(mx3fb, mx3fb_read_reg(mx3fb,
> DI_DISP_ACC_CC) |
> + ((di_mappings[11] - 1) << 12),
> DI_DISP_ACC_CC);
> + break;
> + default:
> + mx3fb_write_reg(mx3fb, di_mappings[12],
> DI_DISP3_B0_MAP);
> + mx3fb_write_reg(mx3fb, di_mappings[13],
> DI_DISP3_B1_MAP);
> + mx3fb_write_reg(mx3fb, di_mappings[14],
> DI_DISP3_B2_MAP);
> + mx3fb_write_reg(mx3fb, mx3fb_read_reg(mx3fb,
> DI_DISP_ACC_CC) |
> + ((di_mappings[15] - 1) << 12),
> DI_DISP_ACC_CC);
> + break;
> + }
> +
> + spin_unlock_irqrestore(&mx3fb->lock, lock_flags);
> +
> + dev_dbg(mx3fb->dev, "DI_DISP_IF_CONF = 0x%08X\n",
> + mx3fb_read_reg(mx3fb, DI_DISP_IF_CONF));
> + dev_dbg(mx3fb->dev, "DI_DISP_SIG_POL = 0x%08X\n",
> + mx3fb_read_reg(mx3fb, DI_DISP_SIG_POL));
> + dev_dbg(mx3fb->dev, "DI_DISP3_TIME_CONF = 0x%08X\n",
> + mx3fb_read_reg(mx3fb, DI_DISP3_TIME_CONF));
> +
> + return 0;
> +}
> +
> +/**
> + * Set the transparent color key for SDC graphic plane.
> + *
> + * @param channel Input parameter for the
> logical channel ID.
> + * @param enable Boolean to enable or disable
> color key
> + * @param colorKey 24-bit RGB color to use as
> transparent color key.
> + * @return This function returns 0 on success or
> negative error code on fail
> + */
> +static int sdc_set_color_key(struct mx3fb_data *mx3fb, enum
> ipu_channel channel,
> + bool enable, uint32_t color_key)
> +{
> + uint32_t reg, sdc_conf;
> + unsigned long lock_flags;
> +
> + spin_lock_irqsave(&mx3fb->lock, lock_flags);
> +
> + sdc_conf = mx3fb_read_reg(mx3fb, SDC_COM_CONF);
> + if (channel == IDMAC_SDC_0)
> + sdc_conf &= ~SDC_COM_GWSEL;
> + else
> + sdc_conf |= SDC_COM_GWSEL;
> +
> + if (enable) {
> + reg = mx3fb_read_reg(mx3fb, SDC_GW_CTRL) & 0xFF000000L;
> + mx3fb_write_reg(mx3fb, reg | (color_key & 0x00FFFFFFL),
> + SDC_GW_CTRL);
> +
> + sdc_conf |= SDC_COM_KEY_COLOR_G;
> + } else {
> + sdc_conf &= ~SDC_COM_KEY_COLOR_G;
> + }
> + mx3fb_write_reg(mx3fb, sdc_conf, SDC_COM_CONF);
> +
> + spin_unlock_irqrestore(&mx3fb->lock, lock_flags);
> +
> + return 0;
> +}
> +
> +/**
> + * Set the foreground and background plane global alpha
> blending modes.
> + *
> + * @param enable Boolean to enable or disable
> global alpha
> + * blending. If disabled, per
> pixel blending is used.
> + * @param alpha Global alpha value.
> + * @return This function returns 0 on success or
> negative error code on fail
> + */
> +static int sdc_set_global_alpha(struct mx3fb_data *mx3fb,
> bool enable, uint8_t alpha)
> +{
> + uint32_t reg;
> + unsigned long lock_flags;
> +
> + spin_lock_irqsave(&mx3fb->lock, lock_flags);
> +
> + if (enable) {
> + reg = mx3fb_read_reg(mx3fb, SDC_GW_CTRL) & 0x00FFFFFFL;
> + mx3fb_write_reg(mx3fb, reg | ((uint32_t) alpha
> << 24), SDC_GW_CTRL);
> +
> + reg = mx3fb_read_reg(mx3fb, SDC_COM_CONF);
> + mx3fb_write_reg(mx3fb, reg | SDC_COM_GLB_A,
> SDC_COM_CONF);
> + } else {
> + reg = mx3fb_read_reg(mx3fb, SDC_COM_CONF);
> + mx3fb_write_reg(mx3fb, reg & ~SDC_COM_GLB_A,
> SDC_COM_CONF);
> + }
> +
> + spin_unlock_irqrestore(&mx3fb->lock, lock_flags);
> +
> + return 0;
> +}
> +
> +static void sdc_set_brightness(struct mx3fb_data *mx3fb,
> uint8_t value)
> +{
> + /* This might be board-specific */
> + mx3fb_write_reg(mx3fb, 0x03000000UL | value << 16,
> SDC_PWM_CTRL);
> + return;
> +}
> +
> +static uint32_t bpp_to_pixfmt(int bpp)
> +{
> + uint32_t pixfmt = 0;
> + switch (bpp) {
> + case 24:
> + pixfmt = IPU_PIX_FMT_BGR24;
> + break;
> + case 32:
> + pixfmt = IPU_PIX_FMT_BGR32;
> + break;
> + case 16:
> + pixfmt = IPU_PIX_FMT_RGB565;
> + break;
> + }
> + return pixfmt;
> +}
> +
> +static int mx3fb_blank(int blank, struct fb_info *fbi);
> +static int mx3fb_map_video_memory(struct fb_info *fbi);
> +static int mx3fb_unmap_video_memory(struct fb_info *fbi);
> +
> +/*
> + * Set fixed framebuffer parameters based on variable settings.
> + *
> + * @param info framebuffer information pointer
> + */
> +static int mx3fb_set_fix(struct fb_info *fbi)
> +{
> + struct fb_fix_screeninfo *fix = &fbi->fix;
> + struct fb_var_screeninfo *var = &fbi->var;
> + struct mx3fb_info *mxc_fbi = fbi->par;
> +
> + if (mxc_fbi->ipu_ch == IDMAC_SDC_1)
> + strncpy(fix->id, "DISP3 FG", 8);
> + else
> + strncpy(fix->id, "DISP3 BG", 8);
> +
> + fix->line_length = var->xres_virtual * var->bits_per_pixel / 8;
> +
> + fix->type = FB_TYPE_PACKED_PIXELS;
> + fix->accel = FB_ACCEL_NONE;
> + fix->visual = FB_VISUAL_TRUECOLOR;
> + fix->xpanstep = 1;
> + fix->ypanstep = 1;
> +
> + return 0;
> +}
> +
> +static void mx3fb_dma_done(void *arg)
> +{
> + struct idmac_tx_desc *tx_desc = to_tx_desc(arg);
> + struct dma_chan *chan = tx_desc->txd.chan;
> + struct idmac_channel *ichannel = to_idmac_chan(chan);
> + struct mx3fb_data *mx3fb = ichannel->client;
> + struct mx3fb_info *mxc_fbi = mx3fb->fbi->par;
> + struct mx3fb_info *mxc_fbi_ovl = mx3fb->fbi_ovl ?
> mx3fb->fbi_ovl->par :
> + NULL;
> + struct mx3fb_info *mxc_fbi_cur;
> +
> + if (ichannel == mxc_fbi->idmac_channel) {
> + mxc_fbi_cur = mxc_fbi;
> + } else if (mxc_fbi_ovl && ichannel ==
> mxc_fbi_ovl->idmac_channel) {
> + mxc_fbi_cur = mxc_fbi_ovl;
> + } else {
> + WARN(1, "Cannot identify channel!\n");
> + return;
> + }
> +
> + /* We only need one interrupt, it will be re-enabled as
> needed */
> + disable_irq(ichannel->eof_irq);
> +
> + complete(&mxc_fbi_cur->flip_cmpl);
> +}
> +
> +/*
> + * Set framebuffer parameters and change the operating mode.
> This function is
> + * either called at the very beginning when setting things
> up, or it cleans up
> + * any existing buffer settings itself
> + *
> + * @param fbi framebuffer information pointer
> + */
> +static int mx3fb_set_par(struct fb_info *fbi)
> +{
> + u32 mem_len;
> + struct ipu_di_signal_cfg sig_cfg;
> + enum ipu_panel mode = IPU_PANEL_TFT;
> + struct mx3fb_info *mxc_fbi = fbi->par;
> + struct mx3fb_data *mx3fb = mxc_fbi->mx3fb;
> + struct idmac_channel *ichan = mxc_fbi->idmac_channel;
> + struct idmac_video_param *video = &ichan->params.video;
> + struct dma_chan *dma_chan = &ichan->dma_chan;
> + struct scatterlist *sg = mxc_fbi->sg;
> + size_t screen_size;
> +
> + mutex_lock(&mxc_fbi->mutex);
> +
> + /* Total cleanup */
> + if (mxc_fbi->txd)
> + sdc_disable_channel(mxc_fbi);
> +
> + mx3fb_set_fix(fbi);
> +
> + mem_len = fbi->var.yres_virtual * fbi->fix.line_length;
> + if (mem_len > fbi->fix.smem_len) {
> + if (fbi->fix.smem_start)
> + mx3fb_unmap_video_memory(fbi);
> +
> + fbi->fix.smem_len = mem_len;
> + if (mx3fb_map_video_memory(fbi) < 0) {
> + mutex_unlock(&mxc_fbi->mutex);
> + return -ENOMEM;
> + }
> + }
> +
> + screen_size = fbi->fix.line_length * fbi->var.yres;
> +
> + sg_init_table(&sg[0], 1);
> + sg_init_table(&sg[1], 1);
> +
> + sg_dma_address(&sg[0]) = fbi->fix.smem_start;
> + sg_set_page(&sg[0], virt_to_page(fbi->screen_base),
> + fbi->fix.smem_len,
> + offset_in_page(fbi->screen_base));
> +
> + mxc_fbi->txd =
> dma_chan->device->device_prep_slave_sg(dma_chan, &sg[0],
> + 1, DMA_TO_DEVICE,
> DMA_PREP_INTERRUPT);
> + if (!mxc_fbi->txd) {
> + mutex_unlock(&mxc_fbi->mutex);
> + return -EIO;
> + }
> +
> + mxc_fbi->txd->callback_param = mxc_fbi->txd;
> + mxc_fbi->txd->callback = mx3fb_dma_done;
> +
> + if (mxc_fbi->ipu_ch == IDMAC_SDC_0) {
> + memset(&sig_cfg, 0, sizeof(sig_cfg));
> + if (fbi->var.sync & FB_SYNC_HOR_HIGH_ACT)
> + sig_cfg.Hsync_pol = true;
> + if (fbi->var.sync & FB_SYNC_VERT_HIGH_ACT)
> + sig_cfg.Vsync_pol = true;
> + if (fbi->var.sync & FB_SYNC_CLK_INVERT)
> + sig_cfg.clk_pol = true;
> + if (fbi->var.sync & FB_SYNC_DATA_INVERT)
> + sig_cfg.data_pol = true;
> + if (fbi->var.sync & FB_SYNC_OE_ACT_HIGH)
> + sig_cfg.enable_pol = true;
> + if (fbi->var.sync & FB_SYNC_CLK_IDLE_EN)
> + sig_cfg.clkidle_en = true;
> + if (fbi->var.sync & FB_SYNC_CLK_SEL_EN)
> + sig_cfg.clksel_en = true;
> + if (fbi->var.sync & FB_SYNC_SHARP_MODE)
> + mode = IPU_PANEL_SHARP_TFT;
> +
> + dev_dbg(fbi->device, "pixclock = %ul Hz\n",
> + (u32) (PICOS2KHZ(fbi->var.pixclock) * 1000UL));
> +
> + if (sdc_init_panel(mx3fb, mode,
> +
> (PICOS2KHZ(fbi->var.pixclock)) * 1000UL,
> + fbi->var.xres, fbi->var.yres,
> + (fbi->var.sync & FB_SYNC_SWAP_RGB) ?
> + IPU_PIX_FMT_BGR666 :
> IPU_PIX_FMT_RGB666,
> + fbi->var.left_margin,
> + fbi->var.hsync_len,
> + fbi->var.right_margin +
> + fbi->var.hsync_len,
> + fbi->var.upper_margin,
> + fbi->var.vsync_len,
> + fbi->var.lower_margin +
> + fbi->var.vsync_len, sig_cfg) != 0) {
> + mutex_unlock(&mxc_fbi->mutex);
> + dev_err(fbi->device,
> + "mx3fb: Error initializing panel.\n");
> + return -EINVAL;
> + }
> + }
> +
> + sdc_set_window_pos(mx3fb, mxc_fbi->ipu_ch, 0, 0);
> +
> + mxc_fbi->cur_ipu_buf = 0;
> +
> + video->out_pixel_fmt =
> bpp_to_pixfmt(fbi->var.bits_per_pixel);
> + video->out_width = fbi->var.xres;
> + video->out_height = fbi->var.yres;
> + video->out_stride = fbi->var.xres_virtual;
> +
> + if (mxc_fbi->blank == FB_BLANK_UNBLANK)
> + sdc_enable_channel(mxc_fbi);
> +
> + mutex_unlock(&mxc_fbi->mutex);
> +
> + return 0;
> +}
> +
> +/*
> + * Check framebuffer variable parameters and adjust to valid values.
> + *
> + * @param var framebuffer variable parameters
> + *
> + * @param info framebuffer information pointer
> + */
> +static int mx3fb_check_var(struct fb_var_screeninfo *var,
> struct fb_info *fbi)
> +{
> + u32 vtotal;
> + u32 htotal;
> +
> + if (var->xres_virtual < var->xres)
> + var->xres_virtual = var->xres;
> + if (var->yres_virtual < var->yres)
> + var->yres_virtual = var->yres;
> +
> + if ((var->bits_per_pixel != 32) && (var->bits_per_pixel
> != 24) &&
> + (var->bits_per_pixel != 16))
> + var->bits_per_pixel = default_bpp;
> +
> + switch (var->bits_per_pixel) {
> + case 16:
> + var->red.length = 5;
> + var->red.offset = 11;
> + var->red.msb_right = 0;
> +
> + var->green.length = 6;
> + var->green.offset = 5;
> + var->green.msb_right = 0;
> +
> + var->blue.length = 5;
> + var->blue.offset = 0;
> + var->blue.msb_right = 0;
> +
> + var->transp.length = 0;
> + var->transp.offset = 0;
> + var->transp.msb_right = 0;
> + break;
> + case 24:
> + var->red.length = 8;
> + var->red.offset = 16;
> + var->red.msb_right = 0;
> +
> + var->green.length = 8;
> + var->green.offset = 8;
> + var->green.msb_right = 0;
> +
> + var->blue.length = 8;
> + var->blue.offset = 0;
> + var->blue.msb_right = 0;
> +
> + var->transp.length = 0;
> + var->transp.offset = 0;
> + var->transp.msb_right = 0;
> + break;
> + case 32:
> + var->red.length = 8;
> + var->red.offset = 16;
> + var->red.msb_right = 0;
> +
> + var->green.length = 8;
> + var->green.offset = 8;
> + var->green.msb_right = 0;
> +
> + var->blue.length = 8;
> + var->blue.offset = 0;
> + var->blue.msb_right = 0;
> +
> + var->transp.length = 8;
> + var->transp.offset = 24;
> + var->transp.msb_right = 0;
> + break;
> + }
> +
> + if (var->pixclock < 1000) {
> + htotal = var->xres + var->right_margin +
> var->hsync_len +
> + var->left_margin;
> + vtotal = var->yres + var->lower_margin +
> var->vsync_len +
> + var->upper_margin;
> + var->pixclock = (vtotal * htotal * 6UL) / 100UL;
> + var->pixclock = KHZ2PICOS(var->pixclock);
> + dev_dbg(fbi->device, "pixclock set for 60Hz
> refresh = %u ps\n",
> + var->pixclock);
> + }
> +
> + var->height = -1;
> + var->width = -1;
> + var->grayscale = 0;
> +
> + /* Copy nonstd field to/from sync for fbset usage */
> + var->sync |= var->nonstd;
> + var->nonstd |= var->sync;
> +
> + return 0;
> +}
> +
> +static u_int _chan_to_field(u_int chan, struct fb_bitfield *bf)
> +{
> + chan &= 0xffff;
> + chan >>= 16 - bf->length;
> + return chan << bf->offset;
> +}
> +
> +static int mx3fb_setcolreg(u_int regno, u_int red, u_int
> green, u_int blue,
> + u_int trans, struct fb_info *fbi)
> +{
> + struct mx3fb_info *mxc_fbi = fbi->par;
> + unsigned int val;
> + int ret = 1;
> +
> + mutex_lock(&mxc_fbi->mutex);
> + /*
> + * If greyscale is true, then we convert the RGB value
> + * to greyscale no matter what visual we are using.
> + */
> + if (fbi->var.grayscale)
> + red = green = blue = (19595 * red + 38470 * green +
> + 7471 * blue) >> 16;
> + switch (fbi->fix.visual) {
> + case FB_VISUAL_TRUECOLOR:
> + /*
> + * 16-bit True Colour. We encode the RGB value
> + * according to the RGB bitfield information.
> + */
> + if (regno < 16) {
> + u32 *pal = fbi->pseudo_palette;
> +
> + val = _chan_to_field(red, &fbi->var.red);
> + val |= _chan_to_field(green, &fbi->var.green);
> + val |= _chan_to_field(blue, &fbi->var.blue);
> +
> + pal[regno] = val;
> +
> + ret = 0;
> + }
> + break;
> +
> + case FB_VISUAL_STATIC_PSEUDOCOLOR:
> + case FB_VISUAL_PSEUDOCOLOR:
> + break;
> + }
> + mutex_unlock(&mxc_fbi->mutex);
> +
> + return ret;
> +}
> +
> +/*
> + * Function to handle custom ioctls for MXC framebuffer.
> + *
> + * @param inode inode struct
> + *
> + * @param file file struct
> + *
> + * @param cmd Ioctl command to handle
> + *
> + * @param arg User pointer to command arguments
> + *
> + * @param fbi framebuffer information pointer
> + */
> +static int mx3fb_ioctl_ovl(struct fb_info *fbi, unsigned int cmd,
> + unsigned long arg)
> +{
> + struct mx3fb_info *mxc_fbi = fbi->par;
> + int retval = 0;
> + int __user *argp = (void __user *)arg;
> + struct mx3fb_alloc_list *mem;
> + int size;
> + unsigned long offset;
> +
> + switch (cmd) {
> + case FBIO_ALLOC:
> + if (get_user(size, argp))
> + return -EFAULT;
> +
> + mem = kzalloc(sizeof(*mem), GFP_KERNEL);
> + if (mem == NULL)
> + return -ENOMEM;
> +
> + mem->size = PAGE_ALIGN(size);
> +
> + mem->cpu_addr = dma_alloc_coherent(fbi->device, size,
> + &mem->phy_addr,
> + GFP_DMA);
> + if (mem->cpu_addr == NULL) {
> + kfree(mem);
> + return -ENOMEM;
> + }
> +
> + mutex_lock(&mxc_fbi->mutex);
> + list_add(&mem->list, &fb_alloc_list);
> + mutex_unlock(&mxc_fbi->mutex);
> +
> + dev_dbg(fbi->device, "allocated %d bytes @ 0x%08X\n",
> + mem->size, mem->phy_addr);
> +
> + if (put_user(mem->phy_addr, argp))
> + return -EFAULT;
> +
> + break;
> + case FBIO_FREE:
> + if (get_user(offset, argp))
> + return -EFAULT;
> +
> + retval = -EINVAL;
> + mutex_lock(&mxc_fbi->mutex);
> + list_for_each_entry(mem, &fb_alloc_list, list) {
> + if (mem->phy_addr == offset) {
> + list_del(&mem->list);
> + dma_free_coherent(fbi->device,
> + mem->size,
> + mem->cpu_addr,
> + mem->phy_addr);
> + kfree(mem);
> + retval = 0;
> + break;
> + }
> + }
> + mutex_unlock(&mxc_fbi->mutex);
> +
> + break;
> + default:
> + retval = -EINVAL;
> + }
> +
> + return retval;
> +}
> +
> +/*
> + * mx3fb_blank():
> + * Blank the display.
> + */
> +static int mx3fb_blank(int blank, struct fb_info *fbi)
> +{
> + struct mx3fb_info *mxc_fbi = fbi->par;
> + struct mx3fb_data *mx3fb = mxc_fbi->mx3fb;
> +
> + dev_dbg(fbi->device, "blank = %d\n", blank);
> +
> + if (mxc_fbi->blank == blank)
> + return 0;
> +
> + mutex_lock(&mxc_fbi->mutex);
> + mxc_fbi->blank = blank;
> +
> + switch (blank) {
> + case FB_BLANK_POWERDOWN:
> + case FB_BLANK_VSYNC_SUSPEND:
> + case FB_BLANK_HSYNC_SUSPEND:
> + case FB_BLANK_NORMAL:
> + sdc_disable_channel(mxc_fbi);
> + sdc_set_brightness(mx3fb, 0);
> + break;
> + case FB_BLANK_UNBLANK:
> + sdc_enable_channel(mxc_fbi);
> + sdc_set_brightness(mx3fb, mx3fb->backlight_level);
> + break;
> + }
> + mutex_unlock(&mxc_fbi->mutex);
> +
> + return 0;
> +}
> +
> +/*
> + * mx3fb_blank_ovl():
> + * Blank the display.
> + */
> +static int mx3fb_blank_ovl(int blank, struct fb_info *fbi)
> +{
> + struct mx3fb_info *mxc_fbi = fbi->par;
> +
> + dev_dbg(fbi->device, "ovl blank = %d\n", blank);
> +
> + if (mxc_fbi->blank == blank)
> + return 0;
> +
> + mutex_lock(&mxc_fbi->mutex);
> + mxc_fbi->blank = blank;
> +
> + switch (blank) {
> + case FB_BLANK_POWERDOWN:
> + case FB_BLANK_VSYNC_SUSPEND:
> + case FB_BLANK_HSYNC_SUSPEND:
> + case FB_BLANK_NORMAL:
> + sdc_disable_channel(mxc_fbi);
> + break;
> + case FB_BLANK_UNBLANK:
> + sdc_enable_channel(mxc_fbi);
> + break;
> + }
> + mutex_unlock(&mxc_fbi->mutex);
> +
> + return 0;
> +}
> +
> +/*
> + * Pan or Wrap the Display
> + *
> + * This call looks only at xoffset, yoffset and the
> FB_VMODE_YWRAP flag
> + *
> + * @param var Variable screen buffer information
> + * @param info Framebuffer information pointer
> + */
> +static int mx3fb_pan_display(struct fb_var_screeninfo *var,
> + struct fb_info *fbi)
> +{
> + struct mx3fb_info *mxc_fbi = fbi->par;
> + u32 y_bottom;
> + unsigned long base;
> + off_t offset;
> + dma_cookie_t cookie;
> + struct idmac_tx_desc *desc = to_tx_desc(mxc_fbi->txd);
> + struct scatterlist *sg = desc->sg;
> + struct dma_chan *dma_chan = &mxc_fbi->idmac_channel->dma_chan;
> + struct dma_async_tx_descriptor *txd;
> + int ret;
> +
> + if (var->xoffset > 0) {
> + dev_dbg(fbi->device, "x panning not supported\n");
> + return -EINVAL;
> + }
> +
> + if (fbi->var.xoffset == var->xoffset &&
> + fbi->var.yoffset == var->yoffset)
> + return 0; /* No change, do nothing */
> +
> + y_bottom = var->yoffset;
> +
> + if (!(var->vmode & FB_VMODE_YWRAP))
> + y_bottom += var->yres;
> +
> + if (y_bottom > fbi->var.yres_virtual)
> + return -EINVAL;
> +
> + mutex_lock(&mxc_fbi->mutex);
> +
> + offset = (var->yoffset * var->xres_virtual + var->xoffset) *
> + (var->bits_per_pixel / 8);
> + base = fbi->fix.smem_start + offset;
> +
> + dev_dbg(fbi->device, "Updating SDC BG buf %d address=0x%08lX\n",
> + mxc_fbi->cur_ipu_buf, base);
> +
> + /*
> + * We enable the End of Frame interrupt, which will
> free a tx-descriptor,
> + * which we will need for the next device_prep_slave_sg(). The
> + * IRQ-handler will disable the IRQ again.
> + */
> + init_completion(&mxc_fbi->flip_cmpl);
> + enable_irq(mxc_fbi->idmac_channel->eof_irq);
> +
> + ret = wait_for_completion_timeout(&mxc_fbi->flip_cmpl, HZ / 10);
> + if (ret <= 0) {
> + mutex_unlock(&mxc_fbi->mutex);
> + dev_info(fbi->device, "Panning failed due to
> %s\n", ret < 0 ?
> + "user interrupt" : "timeout");
> + return ret ? : -ETIMEDOUT;
> + }
> +
> + mxc_fbi->cur_ipu_buf = !mxc_fbi->cur_ipu_buf;
> +
> + sg_dma_address(&sg[mxc_fbi->cur_ipu_buf]) = base;
> + sg_set_page(&sg[mxc_fbi->cur_ipu_buf],
> + virt_to_page(fbi->screen_base + offset),
> fbi->fix.smem_len,
> + offset_in_page(fbi->screen_base + offset));
> +
> + txd = dma_chan->device->device_prep_slave_sg(dma_chan, sg +
> + mxc_fbi->cur_ipu_buf, 1, DMA_TO_DEVICE,
> DMA_PREP_INTERRUPT);
> + if (!txd) {
> + dev_err(fbi->device,
> + "Error preparing a DMA transaction
> descriptor.\n");
> + mutex_unlock(&mxc_fbi->mutex);
> + return -EIO;
> + }
> +
> + /*
> + * Emulate original mx3fb behaviour: each new call to
> idmac_tx_submit()
> + * should switch to another buffer
> + */
> + cookie = txd->tx_submit(txd);
> + if (cookie < 0) {
> + dev_err(fbi->device,
> + "Error updating SDC buf %d to
> address=0x%08lX\n",
> + mxc_fbi->cur_ipu_buf, base);
> + mutex_unlock(&mxc_fbi->mutex);
> + return -EIO;
> + }
> +
> + mxc_fbi->txd = txd;
> +
> + fbi->var.xoffset = var->xoffset;
> + fbi->var.yoffset = var->yoffset;
> +
> + if (var->vmode & FB_VMODE_YWRAP)
> + fbi->var.vmode |= FB_VMODE_YWRAP;
> + else
> + fbi->var.vmode &= ~FB_VMODE_YWRAP;
> +
> + mutex_unlock(&mxc_fbi->mutex);
> +
> + dev_dbg(fbi->device, "Update complete\n");
> +
> + return 0;
> +}
> +
> +/*
> + * Function to handle custom mmap for MXC overlay framebuffer.
> + *
> + * @param fbi framebuffer information pointer
> + *
> + * @param vma Pointer to vm_area_struct
> + */
> +static int mx3fb_mmap(struct fb_info *fbi, struct
> vm_area_struct *vma)
> +{
> + struct mx3fb_info *mxc_fbi = fbi->par;
> + bool found = false;
> + size_t len;
> + unsigned long offset = vma->vm_pgoff << PAGE_SHIFT;
> + struct mx3fb_alloc_list *mem;
> +
> + mutex_lock(&mxc_fbi->mutex);
> +
> + if (offset < fbi->fix.smem_len) {
> + /* mapping framebuffer memory */
> + len = fbi->fix.smem_len - offset;
> + vma->vm_pgoff = (fbi->fix.smem_start + offset)
> >> PAGE_SHIFT;
> + } else {
> + list_for_each_entry(mem, &fb_alloc_list, list) {
> + if (offset == mem->phy_addr) {
> + found = true;
> + len = mem->size;
> + break;
> + }
> + }
> + if (!found) {
> + mutex_unlock(&mxc_fbi->mutex);
> + return -EINVAL;
> + }
> + }
> +
> + len = PAGE_ALIGN(len);
> + if (vma->vm_end - vma->vm_start > len) {
> + mutex_unlock(&mxc_fbi->mutex);
> + return -EINVAL;
> + }
> +
> + /* make buffers write-thru cacheable */
> + vma->vm_page_prot = __pgprot(pgprot_val(vma->vm_page_prot) &
> + ~L_PTE_BUFFERABLE);
> +
> + vma->vm_flags |= VM_IO | VM_RESERVED;
> +
> + if (remap_pfn_range(vma, vma->vm_start, vma->vm_pgoff,
> + vma->vm_end - vma->vm_start,
> vma->vm_page_prot)) {
> + mutex_unlock(&mxc_fbi->mutex);
> + dev_dbg(fbi->device, "mmap remap_pfn_range failed\n");
> + return -ENOBUFS;
> +
> + }
> +
> + mutex_unlock(&mxc_fbi->mutex);
> +
> + return 0;
> +}
> +
> +/**
> + * This structure contains the pointers to the control
> functions that are
> + * invoked by the core framebuffer driver to perform operations like
> + * blitting, rectangle filling, copy regions and cursor definition.
> + */
> +static struct fb_ops mx3fb_ops = {
> + .owner = THIS_MODULE,
> + .fb_set_par = mx3fb_set_par,
> + .fb_check_var = mx3fb_check_var,
> + .fb_setcolreg = mx3fb_setcolreg,
> + .fb_pan_display = mx3fb_pan_display,
> + .fb_fillrect = cfb_fillrect,
> + .fb_copyarea = cfb_copyarea,
> + .fb_imageblit = cfb_imageblit,
> + .fb_blank = mx3fb_blank,
> +};
> +
> +static struct fb_ops mx3fb_ovl_ops = {
> + .owner = THIS_MODULE,
> + .fb_set_par = mx3fb_set_par,
> + .fb_check_var = mx3fb_check_var,
> + .fb_setcolreg = mx3fb_setcolreg,
> + .fb_pan_display = mx3fb_pan_display,
> + .fb_ioctl = mx3fb_ioctl_ovl,
> + .fb_mmap = mx3fb_mmap,
> + .fb_fillrect = cfb_fillrect,
> + .fb_copyarea = cfb_copyarea,
> + .fb_imageblit = cfb_imageblit,
> + .fb_blank = mx3fb_blank_ovl,
> +};
> +
> +#ifdef CONFIG_PM
> +/*
> + * Power management hooks. Note that we won't be called
> from IRQ context,
> + * unlike the blank functions above, so we may sleep.
> + */
> +
> +/*
> + * Suspends the framebuffer and blanks the screen. Power
> management support
> + */
> +static int mx3fb_suspend(struct platform_device *pdev,
> pm_message_t state)
> +{
> + struct mx3fb_data *drv_data = platform_get_drvdata(pdev);
> + struct mx3fb_info *mxc_fbi = drv_data->fbi->par;
> + struct mx3fb_info *mxc_fbi_ovl = drv_data->fbi_ovl->par;
> +
> + acquire_console_sem();
> + fb_set_suspend(drv_data->fbi, 1);
> + fb_set_suspend(drv_data->fbi_ovl, 1);
> + release_console_sem();
> +
> + if (mxc_fbi_ovl->blank == FB_BLANK_UNBLANK)
> + sdc_disable_channel(mxc_fbi_ovl);
> +
> + if (mxc_fbi->blank == FB_BLANK_UNBLANK) {
> + sdc_disable_channel(mxc_fbi);
> + sdc_set_brightness(mx3fb, 0);
> +
> + }
> + return 0;
> +}
> +
> +/*
> + * Resumes the framebuffer and unblanks the screen. Power
> management support
> + */
> +static int mx3fb_resume(struct platform_device *pdev)
> +{
> + struct mx3fb_data *drv_data = platform_get_drvdata(pdev);
> + struct mx3fb_info *mxc_fbi = drv_data->fbi->par;
> + struct mx3fb_info *mxc_fbi_ovl = drv_data->fbi_ovl->par;
> +
> + if (mxc_fbi->blank == FB_BLANK_UNBLANK) {
> + sdc_enable_channel(mxc_fbi);
> + sdc_set_brightness(mx3fb, drv_data->backlight_level);
> + }
> +
> + if (mxc_fbi_ovl->blank == FB_BLANK_UNBLANK)
> + sdc_enable_channel(mxc_fbi_ovl);
> +
> + acquire_console_sem();
> + fb_set_suspend(drv_data->fbi, 0);
> + fb_set_suspend(drv_data->fbi_ovl, 0);
> + release_console_sem();
> +
> + return 0;
> +}
> +#else
> +#define mx3fb_suspend NULL
> +#define mx3fb_resume NULL
> +#endif
> +
> +/*
> + * Main framebuffer functions
> + */
> +
> +/**
> + * Allocates the DRAM memory for the frame buffer. This
> buffer is remapped
> + * into a non-cached, non-buffered, memory region to allow
> palette and pixel
> + * writes to occur without flushing the cache. Once this
> area is remapped,
> + * all virtual memory access to the video memory should
> occur at the new region.
> + *
> + * @param fbi framebuffer information pointer
> + *
> + * @return Error code indicating success or failure
> + */
> +static int mx3fb_map_video_memory(struct fb_info *fbi)
> +{
> + int retval = 0;
> + dma_addr_t addr;
> +
> + fbi->screen_base = dma_alloc_writecombine(fbi->device,
> + fbi->fix.smem_len,
> + &addr, GFP_DMA);
> +
> + if (!fbi->screen_base) {
> + dev_err(fbi->device, "Cannot allocate %u bytes
> framebuffer memory\n",
> + fbi->fix.smem_len);
> + retval = -EBUSY;
> + goto err0;
> + }
> +
> + fbi->fix.smem_start = addr;
> +
> + dev_dbg(fbi->device, "allocated fb @ p=0x%08x, v=0x%p,
> size=%d.\n",
> + (uint32_t) fbi->fix.smem_start,
> fbi->screen_base, fbi->fix.smem_len);
> +
> + fbi->screen_size = fbi->fix.smem_len;
> +
> + /* Clear the screen */
> + memset((char *)fbi->screen_base, 0, fbi->fix.smem_len);
> +
> + return 0;
> +
> +err0:
> + fbi->fix.smem_len = 0;
> + fbi->fix.smem_start = 0;
> + fbi->screen_base = NULL;
> + return retval;
> +}
> +
> +/**
> + * De-allocates the DRAM memory for the frame buffer.
> + *
> + * @param fbi framebuffer information pointer
> + *
> + * @return Error code indicating success or failure
> + */
> +static int mx3fb_unmap_video_memory(struct fb_info *fbi)
> +{
> + dma_free_writecombine(fbi->device, fbi->fix.smem_len,
> + fbi->screen_base, fbi->fix.smem_start);
> +
> + fbi->screen_base = 0;
> + fbi->fix.smem_start = 0;
> + fbi->fix.smem_len = 0;
> + return 0;
> +}
> +
> +/**
> + * Initializes the framebuffer information pointer. After allocating
> + * sufficient memory for the framebuffer structure, the fields are
> + * filled with custom information passed in from the configurable
> + * structures. This includes information such as bits per pixel,
> + * color maps, screen width/height and RGBA offsets.
> + *
> + * @return Framebuffer structure initialized with our
> information
> + */
> +static struct fb_info *mx3fb_init_fbinfo(struct device *dev,
> struct fb_ops *ops)
> +{
> + struct fb_info *fbi;
> + struct mx3fb_info *mx3fbi;
> + int ret;
> +
> + /*
> + * Allocate sufficient memory for the fb structure
> + */
> + fbi = framebuffer_alloc(sizeof(struct mx3fb_info), dev);
> + if (!fbi)
> + return NULL;
> +
> + mx3fbi = fbi->par;
> + mx3fbi->cookie = -EINVAL;
> + mx3fbi->cur_ipu_buf = 0;
> +
> + fbi->var.activate = FB_ACTIVATE_NOW;
> +
> + fbi->fbops = ops;
> + fbi->flags = FBINFO_FLAG_DEFAULT;
> + fbi->pseudo_palette = mx3fbi->pseudo_palette;
> +
> + mutex_init(&mx3fbi->mutex);
> +
> + /*
> + * Allocate colormap
> + */
> + ret = fb_alloc_cmap(&fbi->cmap, 16, 0);
> + if (ret < 0) {
> + framebuffer_release(fbi);
> + return NULL;
> + }
> +
> + return fbi;
> +}
> +
> +static int init_fb_chan(struct mx3fb_data *mx3fb, struct
> idmac_channel *ichan)
> +{
> + struct device *dev = mx3fb->dev;
> + struct mx3fb_platform_data *mx3fb_pdata = dev->platform_data;
> + const char *name = mx3fb_pdata->name;
> + unsigned int irq;
> + struct fb_info *fbi;
> + struct mx3fb_info *mx3fbi;
> + const struct fb_videomode *mode;
> + int ret, num_modes;
> +
> + irq = ichan->eof_irq;
> +
> + switch (ichan->dma_chan.chan_id) {
> + case IDMAC_SDC_0:
> + fbi = mx3fb_init_fbinfo(dev, &mx3fb_ops);
> + if (!fbi)
> + return -ENOMEM;
> +
> + if (!fb_mode)
> + fb_mode = name;
> +
> + if (!fb_mode) {
> + ret = -EINVAL;
> + goto emode;
> + }
> +
> + if (mx3fb_pdata->mode && mx3fb_pdata->num_modes) {
> + mode = mx3fb_pdata->mode;
> + num_modes = mx3fb_pdata->num_modes;
> + } else {
> + mode = mx3fb_modedb;
> + num_modes = ARRAY_SIZE(mx3fb_modedb);
> + }
> +
> + if (!fb_find_mode(&fbi->var, fbi, fb_mode, mode,
> + num_modes, NULL, default_bpp)) {
> + ret = -EBUSY;
> + goto emode;
> + }
> +
> + fb_videomode_to_modelist(mode, num_modes,
> &fbi->modelist);
> +
> + /* Default Y virtual size is 2x panel size */
> + fbi->var.yres_virtual = fbi->var.yres * 2;
> +
> + mx3fb->fbi = fbi;
> +
> + /* set Display Interface clock period */
> + mx3fb_write_reg(mx3fb, 0x00100010L, DI_HSP_CLK_PER);
> + /* Might need to trigger HSP clock change - see
> 44.3.3.8.5 */
> +
> + sdc_set_brightness(mx3fb, 255);
> + sdc_set_global_alpha(mx3fb, true, 0xFF);
> + sdc_set_color_key(mx3fb, IDMAC_SDC_0, false, 0);
> +
> + break;
> + case IDMAC_SDC_1:
> + /* We know, that background has been allocated
> already! */
> + fbi = mx3fb_init_fbinfo(dev, &mx3fb_ovl_ops);
> + if (!fbi)
> + return -ENOMEM;
> +
> + /* Default Y virtual size is 2x panel size */
> + fbi->var = mx3fb->fbi->var;
> + /* This shouldn't be necessary, it is already
> set up above */
> + fbi->var.yres_virtual = mx3fb->fbi->var.yres * 2;
> +
> + mx3fb->fbi_ovl = fbi;
> +
> + break;
> + default:
> + return -EINVAL;
> + }
> +
> + mx3fbi = fbi->par;
> + mx3fbi->idmac_channel = ichan;
> + mx3fbi->ipu_ch = ichan->dma_chan.chan_id;
> + mx3fbi->mx3fb = mx3fb;
> + mx3fbi->blank = FB_BLANK_NORMAL;
> +
> + init_completion(&mx3fbi->flip_cmpl);
> + ret = mx3fb_set_par(fbi);
> + if (ret < 0)
> + goto esetpar;
> +
> + /* Overlay stays blanked by default */
> + if (ichan->dma_chan.chan_id == IDMAC_SDC_0) {
> + mx3fb_blank(FB_BLANK_UNBLANK, fbi);
> +
> + dev_info(dev, "mx3fb: fb registered, using mode
> %s\n", fb_mode);
> + }
> +
> +
> + ret = register_framebuffer(fbi);
> + if (ret < 0)
> + goto erfb;
> +
> + return 0;
> +
> +erfb:
> +esetpar:
> +emode:
> + fb_dealloc_cmap(&fbi->cmap);
> + framebuffer_release(fbi);
> +
> + return ret;
> +}
> +
> +static bool chan_filter(struct dma_chan *chan, void *arg)
> +{
> + struct dma_chan_request *rq = arg;
> + struct device *dev;
> + struct mx3fb_platform_data *mx3fb_pdata;
> +
> + if (!rq)
> + return false;
> +
> + dev = rq->mx3fb->dev;
> + mx3fb_pdata = dev->platform_data;
> +
> + return rq->id == chan->chan_id &&
> + mx3fb_pdata->dma_dev == chan->device->dev;
> +}
> +
> +static void release_fbi(struct fb_info *fbi)
> +{
> + mx3fb_unmap_video_memory(fbi);
> +
> + fb_dealloc_cmap(&fbi->cmap);
> +
> + unregister_framebuffer(fbi);
> + framebuffer_release(fbi);
> +}
> +
> +/**
> + * Probe routine for the framebuffer driver. It is called during the
> + * driver binding process. The following functions are
> performed in
> + * this routine: Framebuffer initialization, Memory allocation and
> + * mapping, Framebuffer registration, IPU initialization.
> + *
> + * @return Appropriate error code to the kernel common code
> + */
> +static int mx3fb_probe(struct platform_device *pdev)
> +{
> + struct device *dev = &pdev->dev;
> + int ret;
> + struct resource *sdc_reg;
> + struct mx3fb_data *mx3fb;
> + dma_cap_mask_t mask;
> + struct dma_chan *chan;
> + struct dma_chan_request rq;
> +
> + /*
> + * Display Interface (DI) and Synchronous Display
> Controller (SDC)
> + * registers
> + */
> + sdc_reg = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> + if (!sdc_reg)
> + return -EINVAL;
> +
> + mx3fb = kzalloc(sizeof(*mx3fb), GFP_KERNEL);
> + if (!mx3fb)
> + return -ENOMEM;
> +
> + spin_lock_init(&mx3fb->lock);
> +
> + mx3fb->reg_base = ioremap(sdc_reg->start,
> resource_size(sdc_reg));
> + if (!mx3fb->reg_base) {
> + ret = -ENOMEM;
> + goto eremap;
> + }
> +
> + pr_debug("Remapped %x to %x at %p\n", sdc_reg->start,
> sdc_reg->end,
> + mx3fb->reg_base);
> +
> + /* IDMAC interface */
> + dmaengine_get();
> +
> + mx3fb->dev = dev;
> + platform_set_drvdata(pdev, mx3fb);
> +
> + rq.mx3fb = mx3fb;
> +
> + /*
> + * Request background - it must be the first to
> guarantee channel
> + * requesting order. If background allocation fails, there is no
> + * reason to allocate overlay, however, if overlay
> fails, we still
> + * can use background.
> + */
> + dma_cap_zero(mask);
> + dma_cap_set(DMA_SLAVE, mask);
> + dma_cap_set(DMA_PRIVATE, mask);
> + rq.id = IDMAC_SDC_0;
> + chan = dma_request_channel(mask, chan_filter, &rq);
> + if (!chan) {
> + ret = -EBUSY;
> + goto ersdc0;
> + }
> + mx3fb->idmac_channel[0] = to_idmac_chan(chan);
> + mx3fb->idmac_channel[0]->client = mx3fb;
> +
> + ret = init_fb_chan(mx3fb, to_idmac_chan(chan));
> + if (ret < 0)
> + goto eisdc0;
> +
> + /* ...and foreground channels */
> + dma_cap_zero(mask);
> + dma_cap_set(DMA_SLAVE, mask);
> + dma_cap_set(DMA_PRIVATE, mask);
> + rq.id = IDMAC_SDC_1;
> + chan = dma_request_channel(mask, chan_filter, &rq);
> + if (!chan) {
> + ret = -EBUSY;
> + goto ersdc1;
> + }
> + mx3fb->idmac_channel[1] = to_idmac_chan(chan);
> + mx3fb->idmac_channel[1]->client = mx3fb;
> +
> + ret = init_fb_chan(mx3fb, to_idmac_chan(chan));
> + if (ret < 0)
> + goto eisdc1;
> +
> + mx3fb->backlight_level = 255;
> +
> + return 0;
> +
> +eisdc1:
> + dma_release_channel(&mx3fb->idmac_channel[1]->dma_chan);
> +ersdc1:
> + release_fbi(mx3fb->fbi);
> +eisdc0:
> + dma_release_channel(&mx3fb->idmac_channel[0]->dma_chan);
> +ersdc0:
> + dmaengine_put();
> + iounmap(mx3fb->reg_base);
> +eremap:
> + kfree(mx3fb);
> + dev_err(dev, "mx3fb: failed to register fb\n");
> + return ret;
> +}
> +
> +static int mx3fb_remove(struct platform_device *dev)
> +{
> + struct mx3fb_data *mx3fb = platform_get_drvdata(dev);
> + struct fb_info *fbi = mx3fb->fbi;
> +
> + if (fbi)
> + release_fbi(fbi);
> +
> + fbi = mx3fb->fbi_ovl;
> + if (fbi)
> + release_fbi(fbi);
> +
> + dma_release_channel(&mx3fb->idmac_channel[1]->dma_chan);
> + dma_release_channel(&mx3fb->idmac_channel[0]->dma_chan);
> + dmaengine_put();
> +
> + iounmap(mx3fb->reg_base);
> + kfree(mx3fb);
> + return 0;
> +}
> +
> +static struct platform_driver mx3fb_driver = {
> + .driver = {
> + .name = MX3FB_NAME,
> + },
> + .probe = mx3fb_probe,
> + .remove = mx3fb_remove,
> + .suspend = mx3fb_suspend,
> + .resume = mx3fb_resume,
> +};
> +
> +/*
> + * Parse user specified options (`video=mx3fb:')
> + * example:
> + * video=mx3fb:bpp=16
> + */
> +static int mx3fb_setup(char *options)
> +{
> + char *opt;
> + if (!options || !*options)
> + return 0;
> + while ((opt = strsep(&options, ",")) != NULL) {
> + if (!*opt)
> + continue;
> + if (!strncmp(opt, "bpp=", 4))
> + default_bpp = simple_strtoul(opt + 4, NULL, 0);
> + else
> + fb_mode = opt;
> + }
> + return 0;
> +}
> +
> +static int __init mx3fb_init(void)
> +{
> + int ret = 0;
> +#ifndef MODULE
> + char *option = NULL;
> +
> + if (fb_get_options("mx3fb", &option))
> + return -ENODEV;
> + mx3fb_setup(option);
> +#endif
> +
> + ret = platform_driver_register(&mx3fb_driver);
> + return ret;
> +}
> +
> +static void __exit mx3fb_exit(void)
> +{
> + platform_driver_unregister(&mx3fb_driver);
> +}
> +
> +module_init(mx3fb_init);
> +module_exit(mx3fb_exit);
> +
> +MODULE_AUTHOR("Freescale Semiconductor, Inc.");
> +MODULE_DESCRIPTION("MX3 framebuffer driver");
> +MODULE_ALIAS("platform:" MX3FB_NAME);
> --
> 1.5.4
>
>
> -------------------------------------------------------------------
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