+++ /dev/null
-/*
- * 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;
- int pre_init;
-};
-
-#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;
-
- if (host->pre_init) {
- mxsfb_enable_controller(fb_info);
- host->pre_init = 0;
- return 0;
- }
-
- /*
- * 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 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);
- }
-
- 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;
-
-#if defined(CONFIG_FB_PRE_INIT_FB)
- host->pre_init = 1;
-#endif
-
- 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);
- }
-
- host->pre_init = 0;
- 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");
projects / openwrt / staging / blogic.git / commitdiff