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Date: Fri, 10 Jul 2009 12:10:45 +0400
From: "Andrey Panin" <pazke@...trinvest.ru>
To: Sudhakar Rajashekhara <sudhakar.raj@...com>
Cc: linux-kernel@...r.kernel.org, akpm@...ux-foundation.org,
linux-fbdev-devel@...ts.sourceforge.net,
davinci-linux-open-source@...ux.davincidsp.com,
krzysztof.h1@...zta.fm, Pavel Kiryukhin <pkiryukhin@...mvista.com>,
Steve Chen <schen@...sta.com>
Subject: Re: [PATCH v2] davinci: fb: Frame Buffer driver for TI
DA8xx/OMAP-L1xx
On 191, 07 10, 2009 at 02:30:19AM -0400, Sudhakar Rajashekhara wrote:
> Adds LCD controller (LCDC) driver for TI's DA8xx/OMAP-L1xx
> architecture. LCDC specifications can be found at
> http://www.ti.com/litv/pdf/sprufm0a.
>
> LCDC on DA8xx consists of two independent controllers, the
> Raster Controller and the LCD Interface Display Driver (LIDD)
> controller. LIDD further supports character and graphic displays.
>
> This patch adds support for the graphic display (Sharp LQ035Q3DG01)
> found on the DA830 based EVM. The EVM details can be found at:
> http://support.spectrumdigital.com/boards/dskda830/revc/.
>
> Signed-off-by: Sudhakar Rajashekhara <sudhakar.raj@...com>
> Signed-off-by: Pavel Kiryukhin <pkiryukhin@...mvista.com>
> Signed-off-by: Steve Chen <schen@...sta.com>
> Acked-by: Krzysztof Helt <krzysztof.h1@...pl>
> ---
> This patch applies to Linus's Kernel tree.
>
> Since the previous version, return value of ioremap is being
> checked and mapped region has been unmapped using the iounmap
> call.
Please add iounmap(da8xx_fb_reg_base) to fb_remove() function too,
otherwise mapped region will leak on module unload.
>
> drivers/video/Kconfig | 11 +
> drivers/video/Makefile | 1 +
> drivers/video/da8xx-fb.c | 907 ++++++++++++++++++++++++++++++++++++++++++++++
> include/video/da8xx-fb.h | 106 ++++++
> 4 files changed, 1025 insertions(+), 0 deletions(-)
> create mode 100644 drivers/video/da8xx-fb.c
> create mode 100644 include/video/da8xx-fb.h
>
> diff --git a/drivers/video/Kconfig b/drivers/video/Kconfig
> index 8afcf08..d048b7e 100644
> --- a/drivers/video/Kconfig
> +++ b/drivers/video/Kconfig
> @@ -2038,6 +2038,17 @@ config FB_SH7760
> and 8, 15 or 16 bpp color; 90 degrees clockwise display rotation for
> panels <= 320 pixel horizontal resolution.
>
> +config FB_DA8XX
> + tristate "DA8xx/OMAP-L1xx Framebuffer support"
> + depends on FB && ARCH_DAVINCI_DA830
> + select FB_CFB_FILLRECT
> + select FB_CFB_COPYAREA
> + select FB_CFB_IMAGEBLIT
> + ---help---
> + This is the frame buffer device driver for the TI LCD controller
> + found on DA8xx/OMAP-L1xx SoCs.
> + If unsure, say N.
> +
> config FB_VIRTUAL
> tristate "Virtual Frame Buffer support (ONLY FOR TESTING!)"
> depends on FB
> diff --git a/drivers/video/Makefile b/drivers/video/Makefile
> index 01a819f..288d9b0 100644
> --- a/drivers/video/Makefile
> +++ b/drivers/video/Makefile
> @@ -136,6 +136,7 @@ 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
> +obj-$(CONFIG_FB_DA8XX) += da8xx-fb.o
>
> # the test framebuffer is last
> obj-$(CONFIG_FB_VIRTUAL) += vfb.o
> diff --git a/drivers/video/da8xx-fb.c b/drivers/video/da8xx-fb.c
> new file mode 100644
> index 0000000..fafd82c
> --- /dev/null
> +++ b/drivers/video/da8xx-fb.c
> @@ -0,0 +1,907 @@
> +/*
> + * Copyright (C) 2008-2009 MontaVista Software Inc.
> + * Copyright (C) 2008-2009 Texas Instruments Inc
> + *
> + * Based on the LCD driver for TI Avalanche processors written by
> + * Ajay Singh and Shalom Hai.
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License as published by
> + * the Free Software Foundation; either version 2 of the License, or
> + * (at your option)any later version.
> + *
> + * This program is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
> + * GNU General Public License for more details.
> + *
> + * You should have received a copy of the GNU General Public License
> + * along with this program; if not, write to the Free Software
> + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
> + */
> +#include <linux/module.h>
> +#include <linux/kernel.h>
> +#include <linux/fb.h>
> +#include <linux/dma-mapping.h>
> +#include <linux/device.h>
> +#include <linux/platform_device.h>
> +#include <linux/uaccess.h>
> +#include <linux/device.h>
> +#include <linux/interrupt.h>
> +#include <linux/clk.h>
> +#include <video/da8xx-fb.h>
> +
> +#define DRIVER_NAME "da8xx_lcdc"
> +
> +/* LCD Status Register */
> +#define LCD_END_OF_FRAME0 BIT(8)
> +#define LCD_FIFO_UNDERFLOW BIT(5)
> +#define LCD_SYNC_LOST BIT(2)
> +
> +/* LCD DMA Control Register */
> +#define LCD_DMA_BURST_SIZE(x) ((x) << 4)
> +#define LCD_DMA_BURST_1 0x0
> +#define LCD_DMA_BURST_2 0x1
> +#define LCD_DMA_BURST_4 0x2
> +#define LCD_DMA_BURST_8 0x3
> +#define LCD_DMA_BURST_16 0x4
> +#define LCD_END_OF_FRAME_INT_ENA BIT(2)
> +#define LCD_DUAL_FRAME_BUFFER_ENABLE BIT(0)
> +
> +/* LCD Control Register */
> +#define LCD_CLK_DIVISOR(x) ((x) << 8)
> +#define LCD_RASTER_MODE 0x01
> +
> +/* LCD Raster Control Register */
> +#define LCD_PALETTE_LOAD_MODE(x) ((x) << 20)
> +#define PALETTE_AND_DATA 0x00
> +#define PALETTE_ONLY 0x01
> +
> +#define LCD_MONO_8BIT_MODE BIT(9)
> +#define LCD_RASTER_ORDER BIT(8)
> +#define LCD_TFT_MODE BIT(7)
> +#define LCD_UNDERFLOW_INT_ENA BIT(6)
> +#define LCD_MONOCHROME_MODE BIT(1)
> +#define LCD_RASTER_ENABLE BIT(0)
> +#define LCD_TFT_ALT_ENABLE BIT(23)
> +#define LCD_STN_565_ENABLE BIT(24)
> +
> +/* LCD Raster Timing 2 Register */
> +#define LCD_AC_BIAS_TRANSITIONS_PER_INT(x) ((x) << 16)
> +#define LCD_AC_BIAS_FREQUENCY(x) ((x) << 8)
> +#define LCD_SYNC_CTRL BIT(25)
> +#define LCD_SYNC_EDGE BIT(24)
> +#define LCD_INVERT_PIXEL_CLOCK BIT(22)
> +#define LCD_INVERT_LINE_CLOCK BIT(21)
> +#define LCD_INVERT_FRAME_CLOCK BIT(20)
> +
> +/* LCD Block */
> +#define LCD_CTRL_REG 0x4
> +#define LCD_STAT_REG 0x8
> +#define LCD_RASTER_CTRL_REG 0x28
> +#define LCD_RASTER_TIMING_0_REG 0x2C
> +#define LCD_RASTER_TIMING_1_REG 0x30
> +#define LCD_RASTER_TIMING_2_REG 0x34
> +#define LCD_DMA_CTRL_REG 0x40
> +#define LCD_DMA_FRM_BUF_BASE_ADDR_0_REG 0x44
> +#define LCD_DMA_FRM_BUF_CEILING_ADDR_0_REG 0x48
> +
> +#define WSI_TIMEOUT 50
> +#define PALETTE_SIZE 256
> +#define LEFT_MARGIN 64
> +#define RIGHT_MARGIN 64
> +#define UPPER_MARGIN 32
> +#define LOWER_MARGIN 32
> +
> +static resource_size_t da8xx_fb_reg_base;
> +
> +static inline unsigned int lcdc_read(unsigned int addr)
> +{
> + return (unsigned int)__raw_readl(da8xx_fb_reg_base + (addr));
> +}
> +
> +static inline void lcdc_write(unsigned int val, unsigned int addr)
> +{
> + __raw_writel(val, da8xx_fb_reg_base + (addr));
> +}
> +
> +struct da8xx_fb_par {
> + wait_queue_head_t da8xx_wq;
> + resource_size_t p_palette_base;
> + unsigned char *v_palette_base;
> + struct clk *lcdc_clk;
> + unsigned int irq;
> + unsigned short pseudo_palette[16];
> + unsigned int databuf_sz;
> + unsigned int palette_sz;
> +};
> +
> +/* Variable Screen Information */
> +static struct fb_var_screeninfo da8xx_fb_var __devinitdata = {
> + .xoffset = 0,
> + .yoffset = 0,
> + .transp = {0, 0, 0},
> + .nonstd = 0,
> + .activate = 0,
> + .height = -1,
> + .width = -1,
> + .pixclock = 46666, /* 46us - AUO display */
> + .accel_flags = 0,
> + .left_margin = LEFT_MARGIN,
> + .right_margin = RIGHT_MARGIN,
> + .upper_margin = UPPER_MARGIN,
> + .lower_margin = LOWER_MARGIN,
> + .sync = 0,
> + .vmode = FB_VMODE_NONINTERLACED
> +};
> +
> +static struct fb_fix_screeninfo da8xx_fb_fix __devinitdata = {
> + .id = "DA8xx FB Drv",
> + .type = FB_TYPE_PACKED_PIXELS,
> + .type_aux = 0,
> + .visual = FB_VISUAL_PSEUDOCOLOR,
> + .xpanstep = 1,
> + .ypanstep = 1,
> + .ywrapstep = 1,
> + .accel = FB_ACCEL_NONE
> +};
> +
> +struct da8xx_panel {
> + const char name[25]; /* Full name <vendor>_<model> */
> + unsigned short width;
> + unsigned short height;
> + int hfp; /* Horizontal front porch */
> + int hbp; /* Horizontal back porch */
> + int hsw; /* Horizontal Sync Pulse Width */
> + int vfp; /* Vertical front porch */
> + int vbp; /* Vertical back porch */
> + int vsw; /* Vertical Sync Pulse Width */
> + int pxl_clk; /* Pixel clock */
> +};
> +
> +static struct da8xx_panel known_lcd_panels[] = {
> + /* Sharp LCD035Q3DG01 */
> + [0] = {
> + .name = "Sharp_LCD035Q3DG01",
> + .width = 320,
> + .height = 240,
> + .hfp = 8,
> + .hbp = 6,
> + .hsw = 0,
> + .vfp = 2,
> + .vbp = 2,
> + .vsw = 0,
> + .pxl_clk = 0x10,
> + },
> + /* Sharp LK043T1DG01 */
> + [1] = {
> + .name = "Sharp_LK043T1DG01",
> + .width = 480,
> + .height = 272,
> + .hfp = 2,
> + .hbp = 2,
> + .hsw = 41,
> + .vfp = 2,
> + .vbp = 2,
> + .vsw = 10,
> + .pxl_clk = 0x12,
> + },
> +};
> +
> +/* Disable the Raster Engine of the LCD Controller */
> +static int lcd_disable_raster(struct da8xx_fb_par *par)
> +{
> + int ret = 0;
> + u32 reg;
> +
> + reg = lcdc_read(LCD_RASTER_CTRL_REG);
> + if (reg & LCD_RASTER_ENABLE) {
> + lcdc_write(reg & ~LCD_RASTER_ENABLE, LCD_RASTER_CTRL_REG);
> + ret = wait_event_interruptible_timeout(par->da8xx_wq,
> + !lcdc_read(LCD_STAT_REG) &
> + LCD_END_OF_FRAME0, WSI_TIMEOUT);
> + }
> +
> + if (ret < 0)
> + return ret;
> + if (ret == 0)
> + return -ETIMEDOUT;
> +
> + return 0;
> +}
> +
> +static void lcd_blit(int load_mode, struct da8xx_fb_par *par)
> +{
> + u32 tmp = par->p_palette_base + par->databuf_sz - 4;
> + u32 reg;
> +
> + /* Update the databuf in the hw. */
> + lcdc_write(par->p_palette_base, LCD_DMA_FRM_BUF_BASE_ADDR_0_REG);
> + lcdc_write(tmp, LCD_DMA_FRM_BUF_CEILING_ADDR_0_REG);
> +
> + /* Start the DMA. */
> + reg = lcdc_read(LCD_RASTER_CTRL_REG);
> + reg &= ~(3 << 20);
> + if (load_mode == LOAD_DATA)
> + reg |= LCD_PALETTE_LOAD_MODE(PALETTE_AND_DATA);
> + else if (load_mode == LOAD_PALETTE)
> + reg |= LCD_PALETTE_LOAD_MODE(PALETTE_ONLY);
> +
> + lcdc_write(reg, LCD_RASTER_CTRL_REG);
> +}
> +
> +/* Configure the Burst Size of DMA */
> +static int lcd_cfg_dma(int burst_size)
> +{
> + u32 reg;
> +
> + reg = lcdc_read(LCD_DMA_CTRL_REG) & 0x00000001;
> + switch (burst_size) {
> + case 1:
> + reg |= LCD_DMA_BURST_SIZE(LCD_DMA_BURST_1);
> + break;
> + case 2:
> + reg |= LCD_DMA_BURST_SIZE(LCD_DMA_BURST_2);
> + break;
> + case 4:
> + reg |= LCD_DMA_BURST_SIZE(LCD_DMA_BURST_4);
> + break;
> + case 8:
> + reg |= LCD_DMA_BURST_SIZE(LCD_DMA_BURST_8);
> + break;
> + case 16:
> + reg |= LCD_DMA_BURST_SIZE(LCD_DMA_BURST_16);
> + break;
> + default:
> + return -EINVAL;
> + }
> + lcdc_write(reg | LCD_END_OF_FRAME_INT_ENA, LCD_DMA_CTRL_REG);
> +
> + return 0;
> +}
> +
> +static void lcd_cfg_ac_bias(int period, int transitions_per_int)
> +{
> + u32 reg;
> +
> + /* Set the AC Bias Period and Number of Transisitons per Interrupt */
> + reg = lcdc_read(LCD_RASTER_TIMING_2_REG) & 0xFFF00000;
> + reg |= LCD_AC_BIAS_FREQUENCY(period) |
> + LCD_AC_BIAS_TRANSITIONS_PER_INT(transitions_per_int);
> + lcdc_write(reg, LCD_RASTER_TIMING_2_REG);
> +}
> +
> +static void lcd_cfg_horizontal_sync(int back_porch, int pulse_width,
> + int front_porch)
> +{
> + u32 reg;
> +
> + reg = lcdc_read(LCD_RASTER_TIMING_0_REG) & 0xf;
> + reg |= ((back_porch & 0xff) << 24)
> + | ((front_porch & 0xff) << 16)
> + | ((pulse_width & 0x3f) << 10);
> + lcdc_write(reg, LCD_RASTER_TIMING_0_REG);
> +}
> +
> +static void lcd_cfg_vertical_sync(int back_porch, int pulse_width,
> + int front_porch)
> +{
> + u32 reg;
> +
> + reg = lcdc_read(LCD_RASTER_TIMING_1_REG) & 0x3ff;
> + reg |= ((back_porch & 0xff) << 24)
> + | ((front_porch & 0xff) << 16)
> + | ((pulse_width & 0x3f) << 10);
> + lcdc_write(reg, LCD_RASTER_TIMING_1_REG);
> +}
> +
> +static int lcd_cfg_display(const struct lcd_ctrl_config *cfg)
> +{
> + u32 reg;
> +
> + reg = lcdc_read(LCD_RASTER_CTRL_REG) & ~(LCD_TFT_MODE |
> + LCD_MONO_8BIT_MODE |
> + LCD_MONOCHROME_MODE);
> +
> + switch (cfg->p_disp_panel->panel_shade) {
> + case MONOCHROME:
> + reg |= LCD_MONOCHROME_MODE;
> + if (cfg->mono_8bit_mode)
> + reg |= LCD_MONO_8BIT_MODE;
> + break;
> + case COLOR_ACTIVE:
> + reg |= LCD_TFT_MODE;
> + if (cfg->tft_alt_mode)
> + reg |= LCD_TFT_ALT_ENABLE;
> + break;
> +
> + case COLOR_PASSIVE:
> + if (cfg->stn_565_mode)
> + reg |= LCD_STN_565_ENABLE;
> + break;
> +
> + default:
> + return -EINVAL;
> + }
> +
> + /* enable additional interrupts here */
> + reg |= LCD_UNDERFLOW_INT_ENA;
> +
> + lcdc_write(reg, LCD_RASTER_CTRL_REG);
> +
> + reg = lcdc_read(LCD_RASTER_TIMING_2_REG);
> +
> + if (cfg->sync_ctrl)
> + reg |= LCD_SYNC_CTRL;
> + else
> + reg &= ~LCD_SYNC_CTRL;
> +
> + if (cfg->sync_edge)
> + reg |= LCD_SYNC_EDGE;
> + else
> + reg &= ~LCD_SYNC_EDGE;
> +
> + if (cfg->invert_pxl_clock)
> + reg |= LCD_INVERT_PIXEL_CLOCK;
> + else
> + reg &= ~LCD_INVERT_PIXEL_CLOCK;
> +
> + if (cfg->invert_line_clock)
> + reg |= LCD_INVERT_LINE_CLOCK;
> + else
> + reg &= ~LCD_INVERT_LINE_CLOCK;
> +
> + if (cfg->invert_frm_clock)
> + reg |= LCD_INVERT_FRAME_CLOCK;
> + else
> + reg &= ~LCD_INVERT_FRAME_CLOCK;
> +
> + lcdc_write(reg, LCD_RASTER_TIMING_2_REG);
> +
> + return 0;
> +}
> +
> +static int lcd_cfg_frame_buffer(struct da8xx_fb_par *par, u32 width, u32 height,
> + u32 bpp, u32 raster_order)
> +{
> + u32 bpl, reg;
> +
> + /* Disable Dual Frame Buffer. */
> + reg = lcdc_read(LCD_DMA_CTRL_REG);
> + lcdc_write(reg & ~LCD_DUAL_FRAME_BUFFER_ENABLE,
> + LCD_DMA_CTRL_REG);
> + /* Set the Panel Width */
> + /* Pixels per line = (PPL + 1)*16 */
> + /*0x3F in bits 4..9 gives max horisontal resolution = 1024 pixels*/
> + width &= 0x3f0;
> + reg = lcdc_read(LCD_RASTER_TIMING_0_REG);
> + reg &= 0xfffffc00;
> + reg |= ((width >> 4) - 1) << 4;
> + lcdc_write(reg, LCD_RASTER_TIMING_0_REG);
> +
> + /* Set the Panel Height */
> + reg = lcdc_read(LCD_RASTER_TIMING_1_REG);
> + reg = ((height - 1) & 0x3ff) | (reg & 0xfffffc00);
> + lcdc_write(reg, LCD_RASTER_TIMING_1_REG);
> +
> + /* Set the Raster Order of the Frame Buffer */
> + reg = lcdc_read(LCD_RASTER_CTRL_REG) & ~(1 << 8);
> + if (raster_order)
> + reg |= LCD_RASTER_ORDER;
> + lcdc_write(reg, LCD_RASTER_CTRL_REG);
> +
> + switch (bpp) {
> + case 1:
> + case 2:
> + case 4:
> + case 16:
> + par->palette_sz = 16 * 2;
> + break;
> +
> + case 8:
> + par->palette_sz = 256 * 2;
> + break;
> +
> + default:
> + return -EINVAL;
> + }
> +
> + bpl = width * bpp / 8;
> + par->databuf_sz = height * bpl + par->palette_sz;
> +
> + return 0;
> +}
> +
> +static int fb_setcolreg(unsigned regno, unsigned red, unsigned green,
> + unsigned blue, unsigned transp,
> + struct fb_info *info)
> +{
> + struct da8xx_fb_par *par = info->par;
> + unsigned short *palette = (unsigned short *)par->v_palette_base;
> + u_short pal;
> +
> + if (regno > 255)
> + return 1;
> +
> + if (info->fix.visual == FB_VISUAL_DIRECTCOLOR)
> + return 1;
> +
> + if (info->var.bits_per_pixel == 8) {
> + red >>= 4;
> + green >>= 8;
> + blue >>= 12;
> +
> + pal = (red & 0x0f00);
> + pal |= (green & 0x00f0);
> + pal |= (blue & 0x000f);
> +
> + palette[regno] = pal;
> +
> + } else if ((info->var.bits_per_pixel == 16) && regno < 16) {
> + red >>= (16 - info->var.red.length);
> + red <<= info->var.red.offset;
> +
> + green >>= (16 - info->var.green.length);
> + green <<= info->var.green.offset;
> +
> + blue >>= (16 - info->var.blue.length);
> + blue <<= info->var.blue.offset;
> +
> + par->pseudo_palette[regno] = red | green | blue;
> +
> + palette[0] = 0x4000;
> + }
> +
> + return 0;
> +}
> +
> +static int lcd_reset(struct da8xx_fb_par *par)
> +{
> + int ret = 0;
> +
> + /* Disable the Raster if previously Enabled */
> + if (lcdc_read(LCD_RASTER_CTRL_REG) & LCD_RASTER_ENABLE)
> + ret = lcd_disable_raster(par);
> +
> + /* DMA has to be disabled */
> + lcdc_write(0, LCD_DMA_CTRL_REG);
> + lcdc_write(0, LCD_RASTER_CTRL_REG);
> +
> + return ret;
> +}
> +
> +static int lcd_init(struct da8xx_fb_par *par, const struct lcd_ctrl_config *cfg,
> + struct da8xx_panel *panel)
> +{
> + u32 bpp, ret = 0;
> +
> + ret = lcd_reset(par);
> + if (ret != 0)
> + return ret;
> +
> + /* Configure the LCD clock divisor. */
> + lcdc_write(LCD_CLK_DIVISOR(panel->pxl_clk) |
> + (LCD_RASTER_MODE & 0x1), LCD_CTRL_REG);
> +
> + /* Configure the DMA burst size. */
> + ret = lcd_cfg_dma(cfg->dma_burst_sz);
> + if (ret < 0)
> + return ret;
> +
> + /* Configure the AC bias properties. */
> + lcd_cfg_ac_bias(cfg->ac_bias, cfg->ac_bias_intrpt);
> +
> + /* Configure the vertical and horizontal sync properties. */
> + lcd_cfg_vertical_sync(panel->vbp, panel->vsw, panel->vfp);
> + lcd_cfg_horizontal_sync(panel->hbp, panel->hsw, panel->hfp);
> +
> + /* Configure for disply */
> + ret = lcd_cfg_display(cfg);
> + if (ret < 0)
> + return ret;
> +
> + if (QVGA != cfg->p_disp_panel->panel_type)
> + return -EINVAL;
> +
> + if (cfg->bpp <= cfg->p_disp_panel->max_bpp &&
> + cfg->bpp >= cfg->p_disp_panel->min_bpp)
> + bpp = cfg->bpp;
> + else
> + bpp = cfg->p_disp_panel->max_bpp;
> + if (bpp == 12)
> + bpp = 16;
> + ret = lcd_cfg_frame_buffer(par, (unsigned int)panel->width,
> + (unsigned int)panel->height, bpp,
> + cfg->raster_order);
> + if (ret < 0)
> + return ret;
> +
> + /* Configure FDD */
> + lcdc_write((lcdc_read(LCD_RASTER_CTRL_REG) & 0xfff00fff) |
> + (cfg->fdd << 12), LCD_RASTER_CTRL_REG);
> +
> + return 0;
> +}
> +
> +static irqreturn_t lcdc_irq_handler(int irq, void *arg)
> +{
> + u32 stat = lcdc_read(LCD_STAT_REG);
> + struct da8xx_fb_par *par = arg;
> + u32 reg;
> +
> + if ((stat & LCD_SYNC_LOST) && (stat & LCD_FIFO_UNDERFLOW)) {
> + reg = lcdc_read(LCD_RASTER_CTRL_REG);
> + lcdc_write(reg & ~LCD_RASTER_ENABLE, LCD_RASTER_CTRL_REG);
> + lcdc_write(stat, LCD_STAT_REG);
> + lcdc_write(reg | LCD_RASTER_ENABLE, LCD_RASTER_CTRL_REG);
> + } else
> + lcdc_write(stat, LCD_STAT_REG);
> +
> + wake_up_interruptible(&par->da8xx_wq);
> + return IRQ_HANDLED;
> +}
> +
> +static int fb_check_var(struct fb_var_screeninfo *var,
> + struct fb_info *info)
> +{
> + int err = 0;
> +
> + switch (var->bits_per_pixel) {
> + case 1:
> + case 8:
> + var->red.offset = 0;
> + var->red.length = 8;
> + var->green.offset = 0;
> + var->green.length = 8;
> + var->blue.offset = 0;
> + var->blue.length = 8;
> + var->transp.offset = 0;
> + var->transp.length = 0;
> + break;
> + case 4:
> + var->red.offset = 0;
> + var->red.length = 4;
> + var->green.offset = 0;
> + var->green.length = 4;
> + var->blue.offset = 0;
> + var->blue.length = 4;
> + var->transp.offset = 0;
> + var->transp.length = 0;
> + break;
> + case 16: /* RGB 565 */
> + var->red.offset = 0;
> + var->red.length = 5;
> + var->green.offset = 5;
> + var->green.length = 6;
> + var->blue.offset = 11;
> + var->blue.length = 5;
> + var->transp.offset = 0;
> + var->transp.length = 0;
> + break;
> + default:
> + err = -EINVAL;
> + }
> +
> + var->red.msb_right = 0;
> + var->green.msb_right = 0;
> + var->blue.msb_right = 0;
> + var->transp.msb_right = 0;
> + return err;
> +}
> +
> +static int __devexit fb_remove(struct platform_device *dev)
> +{
> + struct fb_info *info = dev_get_drvdata(&dev->dev);
> + int ret = 0;
> +
> + if (info) {
> + struct da8xx_fb_par *par = info->par;
> +
> + if (lcdc_read(LCD_RASTER_CTRL_REG) & LCD_RASTER_ENABLE)
> + ret = lcd_disable_raster(par);
> + lcdc_write(0, LCD_RASTER_CTRL_REG);
> +
> + /* disable DMA */
> + lcdc_write(0, LCD_DMA_CTRL_REG);
> +
> + unregister_framebuffer(info);
> + fb_dealloc_cmap(&info->cmap);
> + dma_free_coherent(NULL, par->databuf_sz + PAGE_SIZE,
> + info->screen_base,
> + info->fix.smem_start);
> + free_irq(par->irq, NULL);
> + clk_disable(par->lcdc_clk);
> + clk_put(par->lcdc_clk);
> + framebuffer_release(info);
> +
> + }
> + return ret;
> +}
> +
> +static int fb_ioctl(struct fb_info *info, unsigned int cmd,
> + unsigned long arg)
> +{
> + struct lcd_sync_arg sync_arg;
> +
> + switch (cmd) {
> + case FBIOGET_CONTRAST:
> + case FBIOPUT_CONTRAST:
> + case FBIGET_BRIGHTNESS:
> + case FBIPUT_BRIGHTNESS:
> + case FBIGET_COLOR:
> + case FBIPUT_COLOR:
> + return -EINVAL;
> + case FBIPUT_HSYNC:
> + if (copy_from_user(&sync_arg, (char *)arg,
> + sizeof(struct lcd_sync_arg)))
> + return -EINVAL;
> + lcd_cfg_horizontal_sync(sync_arg.back_porch,
> + sync_arg.pulse_width,
> + sync_arg.front_porch);
> + break;
> + case FBIPUT_VSYNC:
> + if (copy_from_user(&sync_arg, (char *)arg,
> + sizeof(struct lcd_sync_arg)))
> + return -EINVAL;
> + lcd_cfg_vertical_sync(sync_arg.back_porch,
> + sync_arg.pulse_width,
> + sync_arg.front_porch);
> + break;
> + default:
> + return -EINVAL;
> + }
> + return 0;
> +}
> +
> +static struct fb_ops da8xx_fb_ops = {
> + .owner = THIS_MODULE,
> + .fb_check_var = fb_check_var,
> + .fb_setcolreg = fb_setcolreg,
> + .fb_ioctl = fb_ioctl,
> + .fb_fillrect = cfb_fillrect,
> + .fb_copyarea = cfb_copyarea,
> + .fb_imageblit = cfb_imageblit,
> +};
> +
> +static int __init fb_probe(struct platform_device *device)
> +{
> + struct da8xx_lcdc_platform_data *fb_pdata =
> + device->dev.platform_data;
> + struct lcd_ctrl_config *lcd_cfg;
> + struct da8xx_panel *lcdc_info;
> + struct fb_info *da8xx_fb_info;
> + struct resource *lcdc_regs;
> + struct clk *fb_clk = NULL;
> + struct da8xx_fb_par *par;
> + resource_size_t len;
> + int ret, i;
> +
> + if (fb_pdata == NULL) {
> + dev_err(&device->dev, "Can not get platform data\n");
> + return -ENOENT;
> + }
> +
> + lcdc_regs = platform_get_resource(device, IORESOURCE_MEM, 0);
> + if (!lcdc_regs) {
> + dev_err(&device->dev,
> + "Can not get memory resource for LCD controller\n");
> + return -ENOENT;
> + }
> +
> + len = lcdc_regs->end - lcdc_regs->start + 1;
> +
> + lcdc_regs = request_mem_region(lcdc_regs->start, len, lcdc_regs->name);
> + if (!lcdc_regs)
> + return -EBUSY;
> +
> + da8xx_fb_reg_base = (resource_size_t)ioremap(lcdc_regs->start, len);
> + if (!da8xx_fb_reg_base) {
> + ret = -EBUSY;
> + goto err_request_mem;
> + }
> +
> + fb_clk = clk_get(&device->dev, NULL);
> + if (IS_ERR(fb_clk)) {
> + dev_err(&device->dev, "Can not get device clock\n");
> + ret = -ENODEV;
> + goto err_ioremap;
> + }
> + ret = clk_enable(fb_clk);
> + if (ret)
> + goto err_clk_put;
> +
> + for (i = 0, lcdc_info = known_lcd_panels;
> + i < ARRAY_SIZE(known_lcd_panels);
> + i++, lcdc_info++) {
> + if (strcmp(fb_pdata->type, lcdc_info->name) == 0)
> + break;
> + }
> +
> + if (i == ARRAY_SIZE(known_lcd_panels)) {
> + dev_err(&device->dev, "GLCD: No valid panel found\n");
> + ret = ENODEV;
> + goto err_clk_disable;
> + } else
> + dev_info(&device->dev, "GLCD: Found %s panel\n",
> + fb_pdata->type);
> +
> + lcd_cfg = (struct lcd_ctrl_config *)fb_pdata->controller_data;
> +
> + da8xx_fb_info = framebuffer_alloc(sizeof(struct da8xx_fb_par),
> + &device->dev);
> + if (!da8xx_fb_info) {
> + dev_dbg(&device->dev, "Memory allocation failed for fb_info\n");
> + ret = -ENOMEM;
> + goto err_clk_disable;
> + }
> +
> + par = da8xx_fb_info->par;
> +
> + if (lcd_init(par, lcd_cfg, lcdc_info) < 0) {
> + dev_err(&device->dev, "lcd_init failed\n");
> + ret = -EFAULT;
> + goto err_release_fb;
> + }
> +
> + /* allocate frame buffer */
> + da8xx_fb_info->screen_base = dma_alloc_coherent(NULL,
> + par->databuf_sz + PAGE_SIZE,
> + (resource_size_t *)
> + &da8xx_fb_info->fix.smem_start,
> + GFP_KERNEL | GFP_DMA);
> +
> + if (!da8xx_fb_info->screen_base) {
> + dev_err(&device->dev,
> + "GLCD: kmalloc for frame buffer failed\n");
> + ret = -EINVAL;
> + goto err_release_fb;
> + }
> +
> + /* move palette base pointer by (PAGE_SIZE - palette_sz) bytes */
> + par->v_palette_base = da8xx_fb_info->screen_base +
> + (PAGE_SIZE - par->palette_sz);
> + par->p_palette_base = da8xx_fb_info->fix.smem_start +
> + (PAGE_SIZE - par->palette_sz);
> +
> + /* the rest of the frame buffer is pixel data */
> + da8xx_fb_info->screen_base = par->v_palette_base + par->palette_sz;
> + da8xx_fb_fix.smem_start = par->p_palette_base + par->palette_sz;
> + da8xx_fb_fix.smem_len = par->databuf_sz - par->palette_sz;
> + da8xx_fb_fix.line_length = (lcdc_info->width * lcd_cfg->bpp) / 8;
> +
> + par->lcdc_clk = fb_clk;
> +
> + init_waitqueue_head(&par->da8xx_wq);
> +
> + par->irq = platform_get_irq(device, 0);
> + if (par->irq < 0) {
> + ret = -ENOENT;
> + goto err_release_fb_mem;
> + }
> +
> + ret = request_irq(par->irq, lcdc_irq_handler, 0, DRIVER_NAME, par);
> + if (ret)
> + goto err_release_fb_mem;
> +
> + /* Initialize par */
> + da8xx_fb_info->var.bits_per_pixel = lcd_cfg->bpp;
> +
> + da8xx_fb_var.xres = lcdc_info->width;
> + da8xx_fb_var.xres_virtual = lcdc_info->width;
> +
> + da8xx_fb_var.yres = lcdc_info->height;
> + da8xx_fb_var.yres_virtual = lcdc_info->height;
> +
> + da8xx_fb_var.grayscale =
> + lcd_cfg->p_disp_panel->panel_shade == MONOCHROME ? 1 : 0;
> + da8xx_fb_var.bits_per_pixel = lcd_cfg->bpp;
> +
> + da8xx_fb_var.hsync_len = lcdc_info->hsw;
> + da8xx_fb_var.vsync_len = lcdc_info->vsw;
> +
> + /* Initialize fbinfo */
> + da8xx_fb_info->flags = FBINFO_FLAG_DEFAULT;
> + da8xx_fb_info->fix = da8xx_fb_fix;
> + da8xx_fb_info->var = da8xx_fb_var;
> + da8xx_fb_info->fbops = &da8xx_fb_ops;
> + da8xx_fb_info->pseudo_palette = par->pseudo_palette;
> +
> + ret = fb_alloc_cmap(&da8xx_fb_info->cmap, PALETTE_SIZE, 0);
> + if (ret)
> + goto err_free_irq;
> +
> + /* First palette_sz byte of the frame buffer is the palette */
> + da8xx_fb_info->cmap.len = par->palette_sz;
> +
> + /* Flush the buffer to the screen. */
> + lcd_blit(LOAD_DATA, par);
> +
> + /* initialize var_screeninfo */
> + da8xx_fb_var.activate = FB_ACTIVATE_FORCE;
> + fb_set_var(da8xx_fb_info, &da8xx_fb_var);
> +
> + dev_set_drvdata(&device->dev, da8xx_fb_info);
> + /* Register the Frame Buffer */
> + if (register_framebuffer(da8xx_fb_info) < 0) {
> + dev_err(&device->dev,
> + "GLCD: Frame Buffer Registration Failed!\n");
> + ret = -EINVAL;
> + goto err_dealloc_cmap;
> + }
> +
> + /* enable raster engine */
> + lcdc_write(lcdc_read(LCD_RASTER_CTRL_REG) |
> + LCD_RASTER_ENABLE, LCD_RASTER_CTRL_REG);
> +
> + return 0;
> +
> +err_dealloc_cmap:
> + fb_dealloc_cmap(&da8xx_fb_info->cmap);
> +
> +err_free_irq:
> + free_irq(par->irq, NULL);
> +
> +err_release_fb_mem:
> + dma_free_coherent(NULL, par->databuf_sz + PAGE_SIZE,
> + da8xx_fb_info->screen_base,
> + da8xx_fb_info->fix.smem_start);
> +
> +err_release_fb:
> + framebuffer_release(da8xx_fb_info);
> +
> +err_clk_disable:
> + clk_disable(fb_clk);
> +
> +err_clk_put:
> + clk_put(fb_clk);
> +
> +err_ioremap:
> + iounmap(da8xx_fb_reg_base);
> +
> +err_request_mem:
> + release_mem_region(lcdc_regs->start, len);;
> +
> + return ret;
> +}
> +
> +#ifdef CONFIG_PM
> +static int fb_suspend(struct platform_device *dev, pm_message_t state)
> +{
> + return -EBUSY;
> +}
> +static int fb_resume(struct platform_device *dev)
> +{
> + return -EBUSY;
> +}
> +#else
> +#define fb_suspend NULL
> +#define fb_resume NULL
> +#endif
> +
> +static struct platform_driver da8xx_fb_driver = {
> + .probe = fb_probe,
> + .remove = fb_remove,
> + .suspend = fb_suspend,
> + .resume = fb_resume,
> + .driver = {
> + .name = DRIVER_NAME,
> + .owner = THIS_MODULE,
> + },
> +};
> +
> +static int __init da8xx_fb_init(void)
> +{
> + return platform_driver_register(&da8xx_fb_driver);
> +}
> +
> +static void __exit da8xx_fb_cleanup(void)
> +{
> + platform_driver_unregister(&da8xx_fb_driver);
> +}
> +
> +module_init(da8xx_fb_init);
> +module_exit(da8xx_fb_cleanup);
> +
> +MODULE_DESCRIPTION("Framebuffer driver for TI da8xx/omap-l1xx");
> +MODULE_AUTHOR("Texas Instruments");
> +MODULE_LICENSE("GPL");
> diff --git a/include/video/da8xx-fb.h b/include/video/da8xx-fb.h
> new file mode 100644
> index 0000000..5f77675
> --- /dev/null
> +++ b/include/video/da8xx-fb.h
> @@ -0,0 +1,106 @@
> +/*
> + * Header file for TI DA8XX LCD controller platform data.
> + *
> + * Copyright (C) 2008-2009 MontaVista Software Inc.
> + * Copyright (C) 2008-2009 Texas Instruments Inc
> + *
> + * This file is licensed under the terms of the GNU General Public License
> + * version 2. This program is licensed "as is" without any warranty of any
> + * kind, whether express or implied.
> + */
> +
> +#ifndef DA8XX_FB_H
> +#define DA8XX_FB_H
> +
> +enum panel_type {
> + QVGA = 0
> +};
> +
> +enum panel_shade {
> + MONOCHROME = 0,
> + COLOR_ACTIVE,
> + COLOR_PASSIVE,
> +};
> +
> +enum raster_load_mode {
> + LOAD_DATA = 1,
> + LOAD_PALETTE,
> +};
> +
> +struct display_panel {
> + enum panel_type panel_type; /* QVGA */
> + int max_bpp;
> + int min_bpp;
> + enum panel_shade panel_shade;
> +};
> +
> +struct da8xx_lcdc_platform_data {
> + const char manu_name[10];
> + void *controller_data;
> + const char type[25];
> +};
> +
> +struct lcd_ctrl_config {
> + const struct display_panel *p_disp_panel;
> +
> + /* AC Bias Pin Frequency */
> + int ac_bias;
> +
> + /* AC Bias Pin Transitions per Interrupt */
> + int ac_bias_intrpt;
> +
> + /* DMA burst size */
> + int dma_burst_sz;
> +
> + /* Bits per pixel */
> + int bpp;
> +
> + /* FIFO DMA Request Delay */
> + int fdd;
> +
> + /* TFT Alternative Signal Mapping (Only for active) */
> + unsigned char tft_alt_mode;
> +
> + /* 12 Bit Per Pixel (5-6-5) Mode (Only for passive) */
> + unsigned char stn_565_mode;
> +
> + /* Mono 8-bit Mode: 1=D0-D7 or 0=D0-D3 */
> + unsigned char mono_8bit_mode;
> +
> + /* Invert pixel clock */
> + unsigned char invert_pxl_clock;
> +
> + /* Invert line clock */
> + unsigned char invert_line_clock;
> +
> + /* Invert frame clock */
> + unsigned char invert_frm_clock;
> +
> + /* Horizontal and Vertical Sync Edge: 0=rising 1=falling */
> + unsigned char sync_edge;
> +
> + /* Horizontal and Vertical Sync: Control: 0=ignore */
> + unsigned char sync_ctrl;
> +
> + /* Raster Data Order Select: 1=Most-to-least 0=Least-to-most */
> + unsigned char raster_order;
> +};
> +
> +struct lcd_sync_arg {
> + int back_porch;
> + int front_porch;
> + int pulse_width;
> +};
> +
> +/* ioctls */
> +#define FBIOGET_CONTRAST _IOR('F', 1, int)
> +#define FBIOPUT_CONTRAST _IOW('F', 2, int)
> +#define FBIGET_BRIGHTNESS _IOR('F', 3, int)
> +#define FBIPUT_BRIGHTNESS _IOW('F', 3, int)
> +#define FBIGET_COLOR _IOR('F', 5, int)
> +#define FBIPUT_COLOR _IOW('F', 6, int)
> +#define FBIPUT_HSYNC _IOW('F', 9, int)
> +#define FBIPUT_VSYNC _IOW('F', 10, int)
> +
> +#endif /* ifndef DA8XX_FB_H */
> +
> --
> 1.5.6
>
> --
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