diff options
Diffstat (limited to 'drivers/video/fbdev/mxsfb.c')
| -rw-r--r-- | drivers/video/fbdev/mxsfb.c | 1026 |
1 files changed, 1026 insertions, 0 deletions
diff --git a/drivers/video/fbdev/mxsfb.c b/drivers/video/fbdev/mxsfb.c new file mode 100644 index 000000000..12c8bd1d2 --- /dev/null +++ b/drivers/video/fbdev/mxsfb.c @@ -0,0 +1,1026 @@ +/* + * Copyright (C) 2010 Juergen Beisert, Pengutronix + * + * This code is based on: + * Author: Vitaly Wool <vital@embeddedalley.com> + * + * Copyright 2008-2009 Freescale Semiconductor, Inc. All Rights Reserved. + * Copyright 2008 Embedded Alley Solutions, Inc All Rights Reserved. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation; either version 2 + * of the License, or (at your option) any later version. + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + */ + +#define DRIVER_NAME "mxsfb" + +/** + * @file + * @brief LCDIF driver for i.MX23 and i.MX28 + * + * The LCDIF support four modes of operation + * - MPU interface (to drive smart displays) -> not supported yet + * - VSYNC interface (like MPU interface plus Vsync) -> not supported yet + * - Dotclock interface (to drive LC displays with RGB data and sync signals) + * - DVI (to drive ITU-R BT656) -> not supported yet + * + * This driver depends on a correct setup of the pins used for this purpose + * (platform specific). + * + * For the developer: Don't forget to set the data bus width to the display + * in the imx_fb_videomode structure. You will else end up with ugly colours. + * If you fight against jitter you can vary the clock delay. This is a feature + * of the i.MX28 and you can vary it between 2 ns ... 8 ns in 2 ns steps. Give + * the required value in the imx_fb_videomode structure. + */ + +#include <linux/module.h> +#include <linux/kernel.h> +#include <linux/of_device.h> +#include <linux/platform_device.h> +#include <linux/clk.h> +#include <linux/dma-mapping.h> +#include <linux/io.h> +#include <linux/fb.h> +#include <linux/regulator/consumer.h> +#include <video/of_display_timing.h> +#include <video/of_videomode.h> +#include <video/videomode.h> + +#define REG_SET 4 +#define REG_CLR 8 + +#define LCDC_CTRL 0x00 +#define LCDC_CTRL1 0x10 +#define LCDC_V4_CTRL2 0x20 +#define LCDC_V3_TRANSFER_COUNT 0x20 +#define LCDC_V4_TRANSFER_COUNT 0x30 +#define LCDC_V4_CUR_BUF 0x40 +#define LCDC_V4_NEXT_BUF 0x50 +#define LCDC_V3_CUR_BUF 0x30 +#define LCDC_V3_NEXT_BUF 0x40 +#define LCDC_TIMING 0x60 +#define LCDC_VDCTRL0 0x70 +#define LCDC_VDCTRL1 0x80 +#define LCDC_VDCTRL2 0x90 +#define LCDC_VDCTRL3 0xa0 +#define LCDC_VDCTRL4 0xb0 +#define LCDC_DVICTRL0 0xc0 +#define LCDC_DVICTRL1 0xd0 +#define LCDC_DVICTRL2 0xe0 +#define LCDC_DVICTRL3 0xf0 +#define LCDC_DVICTRL4 0x100 +#define LCDC_V4_DATA 0x180 +#define LCDC_V3_DATA 0x1b0 +#define LCDC_V4_DEBUG0 0x1d0 +#define LCDC_V3_DEBUG0 0x1f0 + +#define CTRL_SFTRST (1 << 31) +#define CTRL_CLKGATE (1 << 30) +#define CTRL_BYPASS_COUNT (1 << 19) +#define CTRL_VSYNC_MODE (1 << 18) +#define CTRL_DOTCLK_MODE (1 << 17) +#define CTRL_DATA_SELECT (1 << 16) +#define CTRL_SET_BUS_WIDTH(x) (((x) & 0x3) << 10) +#define CTRL_GET_BUS_WIDTH(x) (((x) >> 10) & 0x3) +#define CTRL_SET_WORD_LENGTH(x) (((x) & 0x3) << 8) +#define CTRL_GET_WORD_LENGTH(x) (((x) >> 8) & 0x3) +#define CTRL_MASTER (1 << 5) +#define CTRL_DF16 (1 << 3) +#define CTRL_DF18 (1 << 2) +#define CTRL_DF24 (1 << 1) +#define CTRL_RUN (1 << 0) + +#define CTRL1_FIFO_CLEAR (1 << 21) +#define CTRL1_SET_BYTE_PACKAGING(x) (((x) & 0xf) << 16) +#define CTRL1_GET_BYTE_PACKAGING(x) (((x) >> 16) & 0xf) + +#define TRANSFER_COUNT_SET_VCOUNT(x) (((x) & 0xffff) << 16) +#define TRANSFER_COUNT_GET_VCOUNT(x) (((x) >> 16) & 0xffff) +#define TRANSFER_COUNT_SET_HCOUNT(x) ((x) & 0xffff) +#define TRANSFER_COUNT_GET_HCOUNT(x) ((x) & 0xffff) + + +#define VDCTRL0_ENABLE_PRESENT (1 << 28) +#define VDCTRL0_VSYNC_ACT_HIGH (1 << 27) +#define VDCTRL0_HSYNC_ACT_HIGH (1 << 26) +#define VDCTRL0_DOTCLK_ACT_FALLING (1 << 25) +#define VDCTRL0_ENABLE_ACT_HIGH (1 << 24) +#define VDCTRL0_VSYNC_PERIOD_UNIT (1 << 21) +#define VDCTRL0_VSYNC_PULSE_WIDTH_UNIT (1 << 20) +#define VDCTRL0_HALF_LINE (1 << 19) +#define VDCTRL0_HALF_LINE_MODE (1 << 18) +#define VDCTRL0_SET_VSYNC_PULSE_WIDTH(x) ((x) & 0x3ffff) +#define VDCTRL0_GET_VSYNC_PULSE_WIDTH(x) ((x) & 0x3ffff) + +#define VDCTRL2_SET_HSYNC_PERIOD(x) ((x) & 0x3ffff) +#define VDCTRL2_GET_HSYNC_PERIOD(x) ((x) & 0x3ffff) + +#define VDCTRL3_MUX_SYNC_SIGNALS (1 << 29) +#define VDCTRL3_VSYNC_ONLY (1 << 28) +#define SET_HOR_WAIT_CNT(x) (((x) & 0xfff) << 16) +#define GET_HOR_WAIT_CNT(x) (((x) >> 16) & 0xfff) +#define SET_VERT_WAIT_CNT(x) ((x) & 0xffff) +#define GET_VERT_WAIT_CNT(x) ((x) & 0xffff) + +#define VDCTRL4_SET_DOTCLK_DLY(x) (((x) & 0x7) << 29) /* v4 only */ +#define VDCTRL4_GET_DOTCLK_DLY(x) (((x) >> 29) & 0x7) /* v4 only */ +#define VDCTRL4_SYNC_SIGNALS_ON (1 << 18) +#define SET_DOTCLK_H_VALID_DATA_CNT(x) ((x) & 0x3ffff) + +#define DEBUG0_HSYNC (1 < 26) +#define DEBUG0_VSYNC (1 < 25) + +#define MIN_XRES 120 +#define MIN_YRES 120 + +#define RED 0 +#define GREEN 1 +#define BLUE 2 +#define TRANSP 3 + +#define STMLCDIF_8BIT 1 /** pixel data bus to the display is of 8 bit width */ +#define STMLCDIF_16BIT 0 /** pixel data bus to the display is of 16 bit width */ +#define STMLCDIF_18BIT 2 /** pixel data bus to the display is of 18 bit width */ +#define STMLCDIF_24BIT 3 /** pixel data bus to the display is of 24 bit width */ + +#define MXSFB_SYNC_DATA_ENABLE_HIGH_ACT (1 << 6) +#define MXSFB_SYNC_DOTCLK_FALLING_ACT (1 << 7) /* negative edge sampling */ + +enum mxsfb_devtype { + MXSFB_V3, + MXSFB_V4, +}; + +/* CPU dependent register offsets */ +struct mxsfb_devdata { + unsigned transfer_count; + unsigned cur_buf; + unsigned next_buf; + unsigned debug0; + unsigned hs_wdth_mask; + unsigned hs_wdth_shift; + unsigned ipversion; +}; + +struct mxsfb_info { + struct platform_device *pdev; + struct clk *clk; + struct clk *clk_axi; + struct clk *clk_disp_axi; + void __iomem *base; /* registers */ + unsigned allocated_size; + int enabled; + unsigned ld_intf_width; + unsigned dotclk_delay; + const struct mxsfb_devdata *devdata; + u32 sync; + struct regulator *reg_lcd; +}; + +#define mxsfb_is_v3(host) (host->devdata->ipversion == 3) +#define mxsfb_is_v4(host) (host->devdata->ipversion == 4) + +static const struct mxsfb_devdata mxsfb_devdata[] = { + [MXSFB_V3] = { + .transfer_count = LCDC_V3_TRANSFER_COUNT, + .cur_buf = LCDC_V3_CUR_BUF, + .next_buf = LCDC_V3_NEXT_BUF, + .debug0 = LCDC_V3_DEBUG0, + .hs_wdth_mask = 0xff, + .hs_wdth_shift = 24, + .ipversion = 3, + }, + [MXSFB_V4] = { + .transfer_count = LCDC_V4_TRANSFER_COUNT, + .cur_buf = LCDC_V4_CUR_BUF, + .next_buf = LCDC_V4_NEXT_BUF, + .debug0 = LCDC_V4_DEBUG0, + .hs_wdth_mask = 0x3fff, + .hs_wdth_shift = 18, + .ipversion = 4, + }, +}; + +/* mask and shift depends on architecture */ +static inline u32 set_hsync_pulse_width(struct mxsfb_info *host, unsigned val) +{ + return (val & host->devdata->hs_wdth_mask) << + host->devdata->hs_wdth_shift; +} + +static inline u32 get_hsync_pulse_width(struct mxsfb_info *host, unsigned val) +{ + return (val >> host->devdata->hs_wdth_shift) & + host->devdata->hs_wdth_mask; +} + +static const struct fb_bitfield def_rgb565[] = { + [RED] = { + .offset = 11, + .length = 5, + }, + [GREEN] = { + .offset = 5, + .length = 6, + }, + [BLUE] = { + .offset = 0, + .length = 5, + }, + [TRANSP] = { /* no support for transparency */ + .length = 0, + } +}; + +static const struct fb_bitfield def_rgb888[] = { + [RED] = { + .offset = 16, + .length = 8, + }, + [GREEN] = { + .offset = 8, + .length = 8, + }, + [BLUE] = { + .offset = 0, + .length = 8, + }, + [TRANSP] = { /* no support for transparency */ + .length = 0, + } +}; + +static inline unsigned chan_to_field(unsigned chan, struct fb_bitfield *bf) +{ + chan &= 0xffff; + chan >>= 16 - bf->length; + return chan << bf->offset; +} + +static int mxsfb_check_var(struct fb_var_screeninfo *var, + struct fb_info *fb_info) +{ + struct mxsfb_info *host = fb_info->par; + const struct fb_bitfield *rgb = NULL; + + if (var->xres < MIN_XRES) + var->xres = MIN_XRES; + if (var->yres < MIN_YRES) + var->yres = MIN_YRES; + + var->xres_virtual = var->xres; + + var->yres_virtual = var->yres; + + switch (var->bits_per_pixel) { + case 16: + /* always expect RGB 565 */ + rgb = def_rgb565; + break; + case 32: + switch (host->ld_intf_width) { + case STMLCDIF_8BIT: + pr_debug("Unsupported LCD bus width mapping\n"); + break; + case STMLCDIF_16BIT: + case STMLCDIF_18BIT: + case STMLCDIF_24BIT: + /* real 24 bit */ + rgb = def_rgb888; + break; + } + break; + default: + pr_err("Unsupported colour depth: %u\n", var->bits_per_pixel); + return -EINVAL; + } + + /* + * Copy the RGB parameters for this display + * from the machine specific parameters. + */ + var->red = rgb[RED]; + var->green = rgb[GREEN]; + var->blue = rgb[BLUE]; + var->transp = rgb[TRANSP]; + + return 0; +} + +static inline void mxsfb_enable_axi_clk(struct mxsfb_info *host) +{ + if (host->clk_axi) + clk_prepare_enable(host->clk_axi); +} + +static inline void mxsfb_disable_axi_clk(struct mxsfb_info *host) +{ + if (host->clk_axi) + clk_disable_unprepare(host->clk_axi); +} + +static void mxsfb_enable_controller(struct fb_info *fb_info) +{ + struct mxsfb_info *host = fb_info->par; + u32 reg; + int ret; + + dev_dbg(&host->pdev->dev, "%s\n", __func__); + + if (host->reg_lcd) { + ret = regulator_enable(host->reg_lcd); + if (ret) { + dev_err(&host->pdev->dev, + "lcd regulator enable failed: %d\n", ret); + return; + } + } + + if (host->clk_disp_axi) + clk_prepare_enable(host->clk_disp_axi); + clk_prepare_enable(host->clk); + clk_set_rate(host->clk, PICOS2KHZ(fb_info->var.pixclock) * 1000U); + + mxsfb_enable_axi_clk(host); + + /* if it was disabled, re-enable the mode again */ + writel(CTRL_DOTCLK_MODE, host->base + LCDC_CTRL + REG_SET); + + /* enable the SYNC signals first, then the DMA engine */ + reg = readl(host->base + LCDC_VDCTRL4); + reg |= VDCTRL4_SYNC_SIGNALS_ON; + writel(reg, host->base + LCDC_VDCTRL4); + + writel(CTRL_RUN, host->base + LCDC_CTRL + REG_SET); + + host->enabled = 1; +} + +static void mxsfb_disable_controller(struct fb_info *fb_info) +{ + struct mxsfb_info *host = fb_info->par; + unsigned loop; + u32 reg; + int ret; + + dev_dbg(&host->pdev->dev, "%s\n", __func__); + + /* + * Even if we disable the controller here, it will still continue + * until its FIFOs are running out of data + */ + writel(CTRL_DOTCLK_MODE, host->base + LCDC_CTRL + REG_CLR); + + loop = 1000; + while (loop) { + reg = readl(host->base + LCDC_CTRL); + if (!(reg & CTRL_RUN)) + break; + loop--; + } + + reg = readl(host->base + LCDC_VDCTRL4); + writel(reg & ~VDCTRL4_SYNC_SIGNALS_ON, host->base + LCDC_VDCTRL4); + + mxsfb_disable_axi_clk(host); + + clk_disable_unprepare(host->clk); + if (host->clk_disp_axi) + clk_disable_unprepare(host->clk_disp_axi); + + host->enabled = 0; + + if (host->reg_lcd) { + ret = regulator_disable(host->reg_lcd); + if (ret) + dev_err(&host->pdev->dev, + "lcd regulator disable failed: %d\n", ret); + } +} + +static int mxsfb_set_par(struct fb_info *fb_info) +{ + struct mxsfb_info *host = fb_info->par; + u32 ctrl, vdctrl0, vdctrl4; + int line_size, fb_size; + int reenable = 0; + + line_size = fb_info->var.xres * (fb_info->var.bits_per_pixel >> 3); + fb_size = fb_info->var.yres_virtual * line_size; + + if (fb_size > fb_info->fix.smem_len) + return -ENOMEM; + + fb_info->fix.line_length = line_size; + + /* + * It seems, you can't re-program the controller if it is still running. + * This may lead into shifted pictures (FIFO issue?). + * So, first stop the controller and drain its FIFOs + */ + if (host->enabled) { + reenable = 1; + mxsfb_disable_controller(fb_info); + } + + mxsfb_enable_axi_clk(host); + + /* clear the FIFOs */ + writel(CTRL1_FIFO_CLEAR, host->base + LCDC_CTRL1 + REG_SET); + + ctrl = CTRL_BYPASS_COUNT | CTRL_MASTER | + CTRL_SET_BUS_WIDTH(host->ld_intf_width); + + switch (fb_info->var.bits_per_pixel) { + case 16: + dev_dbg(&host->pdev->dev, "Setting up RGB565 mode\n"); + ctrl |= CTRL_SET_WORD_LENGTH(0); + writel(CTRL1_SET_BYTE_PACKAGING(0xf), host->base + LCDC_CTRL1); + break; + case 32: + dev_dbg(&host->pdev->dev, "Setting up RGB888/666 mode\n"); + ctrl |= CTRL_SET_WORD_LENGTH(3); + switch (host->ld_intf_width) { + case STMLCDIF_8BIT: + mxsfb_disable_axi_clk(host); + dev_err(&host->pdev->dev, + "Unsupported LCD bus width mapping\n"); + return -EINVAL; + case STMLCDIF_16BIT: + case STMLCDIF_18BIT: + case STMLCDIF_24BIT: + /* real 24 bit */ + break; + } + /* do not use packed pixels = one pixel per word instead */ + writel(CTRL1_SET_BYTE_PACKAGING(0x7), host->base + LCDC_CTRL1); + break; + default: + mxsfb_disable_axi_clk(host); + dev_err(&host->pdev->dev, "Unhandled color depth of %u\n", + fb_info->var.bits_per_pixel); + return -EINVAL; + } + + writel(ctrl, host->base + LCDC_CTRL); + + writel(TRANSFER_COUNT_SET_VCOUNT(fb_info->var.yres) | + TRANSFER_COUNT_SET_HCOUNT(fb_info->var.xres), + host->base + host->devdata->transfer_count); + + vdctrl0 = VDCTRL0_ENABLE_PRESENT | /* always in DOTCLOCK mode */ + VDCTRL0_VSYNC_PERIOD_UNIT | + VDCTRL0_VSYNC_PULSE_WIDTH_UNIT | + VDCTRL0_SET_VSYNC_PULSE_WIDTH(fb_info->var.vsync_len); + if (fb_info->var.sync & FB_SYNC_HOR_HIGH_ACT) + vdctrl0 |= VDCTRL0_HSYNC_ACT_HIGH; + if (fb_info->var.sync & FB_SYNC_VERT_HIGH_ACT) + vdctrl0 |= VDCTRL0_VSYNC_ACT_HIGH; + if (host->sync & MXSFB_SYNC_DATA_ENABLE_HIGH_ACT) + vdctrl0 |= VDCTRL0_ENABLE_ACT_HIGH; + if (host->sync & MXSFB_SYNC_DOTCLK_FALLING_ACT) + vdctrl0 |= VDCTRL0_DOTCLK_ACT_FALLING; + + writel(vdctrl0, host->base + LCDC_VDCTRL0); + + /* frame length in lines */ + writel(fb_info->var.upper_margin + fb_info->var.vsync_len + + fb_info->var.lower_margin + fb_info->var.yres, + host->base + LCDC_VDCTRL1); + + /* line length in units of clocks or pixels */ + writel(set_hsync_pulse_width(host, fb_info->var.hsync_len) | + VDCTRL2_SET_HSYNC_PERIOD(fb_info->var.left_margin + + fb_info->var.hsync_len + fb_info->var.right_margin + + fb_info->var.xres), + host->base + LCDC_VDCTRL2); + + writel(SET_HOR_WAIT_CNT(fb_info->var.left_margin + + fb_info->var.hsync_len) | + SET_VERT_WAIT_CNT(fb_info->var.upper_margin + + fb_info->var.vsync_len), + host->base + LCDC_VDCTRL3); + + vdctrl4 = SET_DOTCLK_H_VALID_DATA_CNT(fb_info->var.xres); + if (mxsfb_is_v4(host)) + vdctrl4 |= VDCTRL4_SET_DOTCLK_DLY(host->dotclk_delay); + writel(vdctrl4, host->base + LCDC_VDCTRL4); + + writel(fb_info->fix.smem_start + + fb_info->fix.line_length * fb_info->var.yoffset, + host->base + host->devdata->next_buf); + + mxsfb_disable_axi_clk(host); + + if (reenable) + mxsfb_enable_controller(fb_info); + + return 0; +} + +static int mxsfb_setcolreg(u_int regno, u_int red, u_int green, u_int blue, + u_int transp, struct fb_info *fb_info) +{ + unsigned int val; + int ret = -EINVAL; + + /* + * If greyscale is true, then we convert the RGB value + * to greyscale no matter what visual we are using. + */ + if (fb_info->var.grayscale) + red = green = blue = (19595 * red + 38470 * green + + 7471 * blue) >> 16; + + switch (fb_info->fix.visual) { + case FB_VISUAL_TRUECOLOR: + /* + * 12 or 16-bit True Colour. We encode the RGB value + * according to the RGB bitfield information. + */ + if (regno < 16) { + u32 *pal = fb_info->pseudo_palette; + + val = chan_to_field(red, &fb_info->var.red); + val |= chan_to_field(green, &fb_info->var.green); + val |= chan_to_field(blue, &fb_info->var.blue); + + pal[regno] = val; + ret = 0; + } + break; + + case FB_VISUAL_STATIC_PSEUDOCOLOR: + case FB_VISUAL_PSEUDOCOLOR: + break; + } + + return ret; +} + +static int mxsfb_blank(int blank, struct fb_info *fb_info) +{ + struct mxsfb_info *host = fb_info->par; + + switch (blank) { + case FB_BLANK_POWERDOWN: + case FB_BLANK_VSYNC_SUSPEND: + case FB_BLANK_HSYNC_SUSPEND: + case FB_BLANK_NORMAL: + if (host->enabled) + mxsfb_disable_controller(fb_info); + break; + + case FB_BLANK_UNBLANK: + if (!host->enabled) + mxsfb_enable_controller(fb_info); + break; + } + return 0; +} + +static int mxsfb_pan_display(struct fb_var_screeninfo *var, + struct fb_info *fb_info) +{ + struct mxsfb_info *host = fb_info->par; + unsigned offset; + + if (var->xoffset != 0) + return -EINVAL; + + offset = fb_info->fix.line_length * var->yoffset; + + mxsfb_enable_axi_clk(host); + + /* update on next VSYNC */ + writel(fb_info->fix.smem_start + offset, + host->base + host->devdata->next_buf); + + mxsfb_disable_axi_clk(host); + + return 0; +} + +static struct fb_ops mxsfb_ops = { + .owner = THIS_MODULE, + .fb_check_var = mxsfb_check_var, + .fb_set_par = mxsfb_set_par, + .fb_setcolreg = mxsfb_setcolreg, + .fb_blank = mxsfb_blank, + .fb_pan_display = mxsfb_pan_display, + .fb_fillrect = cfb_fillrect, + .fb_copyarea = cfb_copyarea, + .fb_imageblit = cfb_imageblit, +}; + +static int mxsfb_restore_mode(struct fb_info *fb_info, + struct fb_videomode *vmode) +{ + struct mxsfb_info *host = fb_info->par; + unsigned line_count; + unsigned period; + unsigned long pa, fbsize; + int bits_per_pixel, ofs, ret = 0; + u32 transfer_count, vdctrl0, vdctrl2, vdctrl3, vdctrl4, ctrl; + + mxsfb_enable_axi_clk(host); + + /* Only restore the mode when the controller is running */ + ctrl = readl(host->base + LCDC_CTRL); + if (!(ctrl & CTRL_RUN)) { + ret = -EINVAL; + goto err; + } + + vdctrl0 = readl(host->base + LCDC_VDCTRL0); + vdctrl2 = readl(host->base + LCDC_VDCTRL2); + vdctrl3 = readl(host->base + LCDC_VDCTRL3); + vdctrl4 = readl(host->base + LCDC_VDCTRL4); + + transfer_count = readl(host->base + host->devdata->transfer_count); + + vmode->xres = TRANSFER_COUNT_GET_HCOUNT(transfer_count); + vmode->yres = TRANSFER_COUNT_GET_VCOUNT(transfer_count); + + switch (CTRL_GET_WORD_LENGTH(ctrl)) { + case 0: + bits_per_pixel = 16; + break; + case 3: + bits_per_pixel = 32; + break; + case 1: + default: + ret = -EINVAL; + goto err; + } + + fb_info->var.bits_per_pixel = bits_per_pixel; + + vmode->pixclock = KHZ2PICOS(clk_get_rate(host->clk) / 1000U); + vmode->hsync_len = get_hsync_pulse_width(host, vdctrl2); + vmode->left_margin = GET_HOR_WAIT_CNT(vdctrl3) - vmode->hsync_len; + vmode->right_margin = VDCTRL2_GET_HSYNC_PERIOD(vdctrl2) - + vmode->hsync_len - vmode->left_margin - vmode->xres; + vmode->vsync_len = VDCTRL0_GET_VSYNC_PULSE_WIDTH(vdctrl0); + period = readl(host->base + LCDC_VDCTRL1); + vmode->upper_margin = GET_VERT_WAIT_CNT(vdctrl3) - vmode->vsync_len; + vmode->lower_margin = period - vmode->vsync_len - + vmode->upper_margin - vmode->yres; + + vmode->vmode = FB_VMODE_NONINTERLACED; + + vmode->sync = 0; + if (vdctrl0 & VDCTRL0_HSYNC_ACT_HIGH) + vmode->sync |= FB_SYNC_HOR_HIGH_ACT; + if (vdctrl0 & VDCTRL0_VSYNC_ACT_HIGH) + vmode->sync |= FB_SYNC_VERT_HIGH_ACT; + + pr_debug("Reconstructed video mode:\n"); + pr_debug("%dx%d, hsync: %u left: %u, right: %u, vsync: %u, upper: %u, lower: %u\n", + vmode->xres, vmode->yres, vmode->hsync_len, vmode->left_margin, + vmode->right_margin, vmode->vsync_len, vmode->upper_margin, + vmode->lower_margin); + pr_debug("pixclk: %ldkHz\n", PICOS2KHZ(vmode->pixclock)); + + host->ld_intf_width = CTRL_GET_BUS_WIDTH(ctrl); + host->dotclk_delay = VDCTRL4_GET_DOTCLK_DLY(vdctrl4); + + fb_info->fix.line_length = vmode->xres * (bits_per_pixel >> 3); + + pa = readl(host->base + host->devdata->cur_buf); + fbsize = fb_info->fix.line_length * vmode->yres; + if (pa < fb_info->fix.smem_start) { + ret = -EINVAL; + goto err; + } + if (pa + fbsize > fb_info->fix.smem_start + fb_info->fix.smem_len) { + ret = -EINVAL; + goto err; + } + ofs = pa - fb_info->fix.smem_start; + if (ofs) { + memmove(fb_info->screen_base, fb_info->screen_base + ofs, fbsize); + writel(fb_info->fix.smem_start, host->base + host->devdata->next_buf); + } + + line_count = fb_info->fix.smem_len / fb_info->fix.line_length; + fb_info->fix.ypanstep = 1; + + clk_prepare_enable(host->clk); + host->enabled = 1; + +err: + if (ret) + mxsfb_disable_axi_clk(host); + + return ret; +} + +static int mxsfb_init_fbinfo_dt(struct fb_info *fb_info, + struct fb_videomode *vmode) +{ + struct mxsfb_info *host = fb_info->par; + struct fb_var_screeninfo *var = &fb_info->var; + struct device *dev = &host->pdev->dev; + struct device_node *np = host->pdev->dev.of_node; + struct device_node *display_np; + struct videomode vm; + u32 width; + int ret; + + display_np = of_parse_phandle(np, "display", 0); + if (!display_np) { + dev_err(dev, "failed to find display phandle\n"); + return -ENOENT; + } + + ret = of_property_read_u32(display_np, "bus-width", &width); + if (ret < 0) { + dev_err(dev, "failed to get property bus-width\n"); + goto put_display_node; + } + + switch (width) { + case 8: + host->ld_intf_width = STMLCDIF_8BIT; + break; + case 16: + host->ld_intf_width = STMLCDIF_16BIT; + break; + case 18: + host->ld_intf_width = STMLCDIF_18BIT; + break; + case 24: + host->ld_intf_width = STMLCDIF_24BIT; + break; + default: + dev_err(dev, "invalid bus-width value\n"); + ret = -EINVAL; + goto put_display_node; + } + + ret = of_property_read_u32(display_np, "bits-per-pixel", + &var->bits_per_pixel); + if (ret < 0) { + dev_err(dev, "failed to get property bits-per-pixel\n"); + goto put_display_node; + } + + ret = of_get_videomode(display_np, &vm, OF_USE_NATIVE_MODE); + if (ret) { + dev_err(dev, "failed to get videomode from DT\n"); + goto put_display_node; + } + + ret = fb_videomode_from_videomode(&vm, vmode); + if (ret < 0) + goto put_display_node; + + if (vm.flags & DISPLAY_FLAGS_DE_HIGH) + host->sync |= MXSFB_SYNC_DATA_ENABLE_HIGH_ACT; + + /* + * The PIXDATA flags of the display_flags enum are controller + * centric, e.g. NEGEDGE means drive data on negative edge. + * However, the drivers flag is display centric: Sample the + * data on negative (falling) edge. Therefore, check for the + * POSEDGE flag: + * drive on positive edge => sample on negative edge + */ + if (vm.flags & DISPLAY_FLAGS_PIXDATA_POSEDGE) + host->sync |= MXSFB_SYNC_DOTCLK_FALLING_ACT; + +put_display_node: + of_node_put(display_np); + return ret; +} + +static int mxsfb_init_fbinfo(struct fb_info *fb_info, + struct fb_videomode *vmode) +{ + int ret; + struct mxsfb_info *host = fb_info->par; + struct device *dev = &host->pdev->dev; + struct fb_var_screeninfo *var = &fb_info->var; + dma_addr_t fb_phys; + void *fb_virt; + unsigned fb_size; + + fb_info->fbops = &mxsfb_ops; + fb_info->flags = FBINFO_FLAG_DEFAULT | FBINFO_READS_FAST; + strlcpy(fb_info->fix.id, "mxs", sizeof(fb_info->fix.id)); + fb_info->fix.type = FB_TYPE_PACKED_PIXELS; + fb_info->fix.ypanstep = 1; + fb_info->fix.visual = FB_VISUAL_TRUECOLOR, + fb_info->fix.accel = FB_ACCEL_NONE; + + ret = mxsfb_init_fbinfo_dt(fb_info, vmode); + if (ret) + return ret; + + var->nonstd = 0; + var->activate = FB_ACTIVATE_NOW; + var->accel_flags = 0; + var->vmode = FB_VMODE_NONINTERLACED; + + /* Memory allocation for framebuffer */ + fb_size = SZ_2M; + fb_virt = dma_alloc_wc(dev, PAGE_ALIGN(fb_size), &fb_phys, GFP_KERNEL); + if (!fb_virt) + return -ENOMEM; + + fb_info->fix.smem_start = fb_phys; + fb_info->screen_base = fb_virt; + fb_info->screen_size = fb_info->fix.smem_len = fb_size; + + if (mxsfb_restore_mode(fb_info, vmode)) + memset(fb_virt, 0, fb_size); + + return 0; +} + +static void mxsfb_free_videomem(struct fb_info *fb_info) +{ + struct mxsfb_info *host = fb_info->par; + struct device *dev = &host->pdev->dev; + + dma_free_wc(dev, fb_info->screen_size, fb_info->screen_base, + fb_info->fix.smem_start); +} + +static const struct platform_device_id mxsfb_devtype[] = { + { + .name = "imx23-fb", + .driver_data = MXSFB_V3, + }, { + .name = "imx28-fb", + .driver_data = MXSFB_V4, + }, { + /* sentinel */ + } +}; +MODULE_DEVICE_TABLE(platform, mxsfb_devtype); + +static const struct of_device_id mxsfb_dt_ids[] = { + { .compatible = "fsl,imx23-lcdif", .data = &mxsfb_devtype[0], }, + { .compatible = "fsl,imx28-lcdif", .data = &mxsfb_devtype[1], }, + { /* sentinel */ } +}; +MODULE_DEVICE_TABLE(of, mxsfb_dt_ids); + +static int mxsfb_probe(struct platform_device *pdev) +{ + const struct of_device_id *of_id = + of_match_device(mxsfb_dt_ids, &pdev->dev); + struct resource *res; + struct mxsfb_info *host; + struct fb_info *fb_info; + struct fb_videomode *mode; + int ret; + + if (of_id) + pdev->id_entry = of_id->data; + + fb_info = framebuffer_alloc(sizeof(struct mxsfb_info), &pdev->dev); + if (!fb_info) { + dev_err(&pdev->dev, "Failed to allocate fbdev\n"); + return -ENOMEM; + } + + mode = devm_kzalloc(&pdev->dev, sizeof(struct fb_videomode), + GFP_KERNEL); + if (mode == NULL) + return -ENOMEM; + + host = fb_info->par; + + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + host->base = devm_ioremap_resource(&pdev->dev, res); + if (IS_ERR(host->base)) { + ret = PTR_ERR(host->base); + goto fb_release; + } + + host->pdev = pdev; + platform_set_drvdata(pdev, host); + + host->devdata = &mxsfb_devdata[pdev->id_entry->driver_data]; + + host->clk = devm_clk_get(&host->pdev->dev, NULL); + if (IS_ERR(host->clk)) { + ret = PTR_ERR(host->clk); + goto fb_release; + } + + host->clk_axi = devm_clk_get(&host->pdev->dev, "axi"); + if (IS_ERR(host->clk_axi)) + host->clk_axi = NULL; + + host->clk_disp_axi = devm_clk_get(&host->pdev->dev, "disp_axi"); + if (IS_ERR(host->clk_disp_axi)) + host->clk_disp_axi = NULL; + + host->reg_lcd = devm_regulator_get(&pdev->dev, "lcd"); + if (IS_ERR(host->reg_lcd)) + host->reg_lcd = NULL; + + fb_info->pseudo_palette = devm_kcalloc(&pdev->dev, 16, sizeof(u32), + GFP_KERNEL); + if (!fb_info->pseudo_palette) { + ret = -ENOMEM; + goto fb_release; + } + + ret = mxsfb_init_fbinfo(fb_info, mode); + if (ret != 0) + goto fb_release; + + fb_videomode_to_var(&fb_info->var, mode); + + /* init the color fields */ + mxsfb_check_var(&fb_info->var, fb_info); + + platform_set_drvdata(pdev, fb_info); + + ret = register_framebuffer(fb_info); + if (ret != 0) { + dev_err(&pdev->dev,"Failed to register framebuffer\n"); + goto fb_destroy; + } + + if (!host->enabled) { + mxsfb_enable_axi_clk(host); + writel(0, host->base + LCDC_CTRL); + mxsfb_disable_axi_clk(host); + mxsfb_set_par(fb_info); + mxsfb_enable_controller(fb_info); + } + + dev_info(&pdev->dev, "initialized\n"); + + return 0; + +fb_destroy: + if (host->enabled) + clk_disable_unprepare(host->clk); +fb_release: + framebuffer_release(fb_info); + + return ret; +} + +static int mxsfb_remove(struct platform_device *pdev) +{ + struct fb_info *fb_info = platform_get_drvdata(pdev); + struct mxsfb_info *host = fb_info->par; + + if (host->enabled) + mxsfb_disable_controller(fb_info); + + unregister_framebuffer(fb_info); + mxsfb_free_videomem(fb_info); + + framebuffer_release(fb_info); + + return 0; +} + +static void mxsfb_shutdown(struct platform_device *pdev) +{ + struct fb_info *fb_info = platform_get_drvdata(pdev); + struct mxsfb_info *host = fb_info->par; + + mxsfb_enable_axi_clk(host); + + /* + * Force stop the LCD controller as keeping it running during reboot + * might interfere with the BootROM's boot mode pads sampling. + */ + writel(CTRL_RUN, host->base + LCDC_CTRL + REG_CLR); + + mxsfb_disable_axi_clk(host); +} + +static struct platform_driver mxsfb_driver = { + .probe = mxsfb_probe, + .remove = mxsfb_remove, + .shutdown = mxsfb_shutdown, + .id_table = mxsfb_devtype, + .driver = { + .name = DRIVER_NAME, + .of_match_table = mxsfb_dt_ids, + }, +}; + +module_platform_driver(mxsfb_driver); + +MODULE_DESCRIPTION("Freescale mxs framebuffer driver"); +MODULE_AUTHOR("Sascha Hauer, Pengutronix"); +MODULE_LICENSE("GPL"); |