RE: [PATCH 3/4 v2] i.MX31: framebuffer driver

From: Herring Robert
Date: Wed Dec 10 2008 - 11:24:09 EST

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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@xxxxxxxxxxxxxxxxxxxxxx
> [mailto:linux-arm-kernel-bounces@xxxxxxxxxxxxxxxxxxxxxx] On
> Behalf Of Guennadi Liakhovetski
> Sent: Wednesday, December 10, 2008 4:36 AM
> To: linux-kernel@xxxxxxxxxxxxxxx
> Cc: linux-fbdev-devel@xxxxxxxxxxxxxxxxxxxxx;
> adaplas@xxxxxxxxx; Sascha Hauer;
> linux-arm-kernel@xxxxxxxxxxxxxxxxxxxxxx; Dan Williams
> Subject: [PATCH 3/4 v2] i.MX31: framebuffer driver
>
> From: Guennadi Liakhovetski <g.liakhovetski@xxxxxx>
>
> 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@xxxxxxx>
> ---
> 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@xxxxxxx>
> + *
> + * 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@xxxxxxx>
> + *
> + * 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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>
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