--- /dev/null
+/*
+ * Freescale i.MX Frame Buffer device driver
+ *
+ * Copyright (C) 2004 Sascha Hauer, Pengutronix
+ * Based on acornfb.c Copyright (C) Russell King.
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License. See the file COPYING in the main directory of this archive for
+ * more details.
+ *
+ * Please direct your questions and comments on this driver to the following
+ * email address:
+ *
+ * linux-arm-kernel@lists.arm.linux.org.uk
+ */
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/errno.h>
+#include <linux/string.h>
+#include <linux/interrupt.h>
+#include <linux/slab.h>
+#include <linux/mm.h>
+#include <linux/fb.h>
+#include <linux/delay.h>
+#include <linux/init.h>
+#include <linux/ioport.h>
+#include <linux/cpufreq.h>
+#include <linux/clk.h>
+#include <linux/platform_device.h>
+#include <linux/dma-mapping.h>
+#include <linux/io.h>
+#include <linux/lcd.h>
+#include <linux/math64.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
+
+#include <linux/regulator/consumer.h>
+
+#include <video/of_display_timing.h>
+#include <video/of_videomode.h>
+#include <video/videomode.h>
+
+#include <linux/platform_data/video-imxfb.h>
+
+/*
+ * Complain if VAR is out of range.
+ */
+#define DEBUG_VAR 1
+
+#define DRIVER_NAME "imx-fb"
+
+#define LCDC_SSA 0x00
+
+#define LCDC_SIZE 0x04
+#define SIZE_XMAX(x) ((((x) >> 4) & 0x3f) << 20)
+
+#define YMAX_MASK_IMX1 0x1ff
+#define YMAX_MASK_IMX21 0x3ff
+
+#define LCDC_VPW 0x08
+#define VPW_VPW(x) ((x) & 0x3ff)
+
+#define LCDC_CPOS 0x0C
+#define CPOS_CC1 (1<<31)
+#define CPOS_CC0 (1<<30)
+#define CPOS_OP (1<<28)
+#define CPOS_CXP(x) (((x) & 3ff) << 16)
+
+#define LCDC_LCWHB 0x10
+#define LCWHB_BK_EN (1<<31)
+#define LCWHB_CW(w) (((w) & 0x1f) << 24)
+#define LCWHB_CH(h) (((h) & 0x1f) << 16)
+#define LCWHB_BD(x) ((x) & 0xff)
+
+#define LCDC_LCHCC 0x14
+
+#define LCDC_PCR 0x18
+
+#define LCDC_HCR 0x1C
+#define HCR_H_WIDTH(x) (((x) & 0x3f) << 26)
+#define HCR_H_WAIT_1(x) (((x) & 0xff) << 8)
+#define HCR_H_WAIT_2(x) ((x) & 0xff)
+
+#define LCDC_VCR 0x20
+#define VCR_V_WIDTH(x) (((x) & 0x3f) << 26)
+#define VCR_V_WAIT_1(x) (((x) & 0xff) << 8)
+#define VCR_V_WAIT_2(x) ((x) & 0xff)
+
+#define LCDC_POS 0x24
+#define POS_POS(x) ((x) & 1f)
+
+#define LCDC_LSCR1 0x28
+/* bit fields in imxfb.h */
+
+#define LCDC_PWMR 0x2C
+/* bit fields in imxfb.h */
+
+#define LCDC_DMACR 0x30
+/* bit fields in imxfb.h */
+
+#define LCDC_RMCR 0x34
+
+#define RMCR_LCDC_EN_MX1 (1<<1)
+
+#define RMCR_SELF_REF (1<<0)
+
+#define LCDC_LCDICR 0x38
+#define LCDICR_INT_SYN (1<<2)
+#define LCDICR_INT_CON (1)
+
+#define LCDC_LCDISR 0x40
+#define LCDISR_UDR_ERR (1<<3)
+#define LCDISR_ERR_RES (1<<2)
+#define LCDISR_EOF (1<<1)
+#define LCDISR_BOF (1<<0)
+
+#define IMXFB_LSCR1_DEFAULT 0x00120300
+
+/* Used fb-mode. Can be set on kernel command line, therefore file-static. */
+static const char *fb_mode;
+
+/*
+ * These are the bitfields for each
+ * display depth that we support.
+ */
+struct imxfb_rgb {
+ struct fb_bitfield red;
+ struct fb_bitfield green;
+ struct fb_bitfield blue;
+ struct fb_bitfield transp;
+};
+
+enum imxfb_type {
+ IMX1_FB,
+ IMX21_FB,
+};
+
+struct imxfb_info {
+ struct platform_device *pdev;
+ void __iomem *regs;
+ struct clk *clk_ipg;
+ struct clk *clk_ahb;
+ struct clk *clk_per;
+ enum imxfb_type devtype;
+ bool enabled;
+
+ /*
+ * These are the addresses we mapped
+ * the framebuffer memory region to.
+ */
+ dma_addr_t map_dma;
+ u_int map_size;
+
+ u_int palette_size;
+
+ dma_addr_t dbar1;
+ dma_addr_t dbar2;
+
+ u_int pcr;
+ u_int pwmr;
+ u_int lscr1;
+ u_int dmacr;
+ bool cmap_inverse;
+ bool cmap_static;
+
+ struct imx_fb_videomode *mode;
+ int num_modes;
+
+ struct regulator *lcd_pwr;
+};
+
+static struct platform_device_id imxfb_devtype[] = {
+ {
+ .name = "imx1-fb",
+ .driver_data = IMX1_FB,
+ }, {
+ .name = "imx21-fb",
+ .driver_data = IMX21_FB,
+ }, {
+ /* sentinel */
+ }
+};
+MODULE_DEVICE_TABLE(platform, imxfb_devtype);
+
+static const struct of_device_id imxfb_of_dev_id[] = {
+ {
+ .compatible = "fsl,imx1-fb",
+ .data = &imxfb_devtype[IMX1_FB],
+ }, {
+ .compatible = "fsl,imx21-fb",
+ .data = &imxfb_devtype[IMX21_FB],
+ }, {
+ /* sentinel */
+ }
+};
+MODULE_DEVICE_TABLE(of, imxfb_of_dev_id);
+
+static inline int is_imx1_fb(struct imxfb_info *fbi)
+{
+ return fbi->devtype == IMX1_FB;
+}
+
+#define IMX_NAME "IMX"
+
+/*
+ * Minimum X and Y resolutions
+ */
+#define MIN_XRES 64
+#define MIN_YRES 64
+
+/* Actually this really is 18bit support, the lowest 2 bits of each colour
+ * are unused in hardware. We claim to have 24bit support to make software
+ * like X work, which does not support 18bit.
+ */
+static struct imxfb_rgb def_rgb_18 = {
+ .red = {.offset = 16, .length = 8,},
+ .green = {.offset = 8, .length = 8,},
+ .blue = {.offset = 0, .length = 8,},
+ .transp = {.offset = 0, .length = 0,},
+};
+
+static struct imxfb_rgb def_rgb_16_tft = {
+ .red = {.offset = 11, .length = 5,},
+ .green = {.offset = 5, .length = 6,},
+ .blue = {.offset = 0, .length = 5,},
+ .transp = {.offset = 0, .length = 0,},
+};
+
+static struct imxfb_rgb def_rgb_16_stn = {
+ .red = {.offset = 8, .length = 4,},
+ .green = {.offset = 4, .length = 4,},
+ .blue = {.offset = 0, .length = 4,},
+ .transp = {.offset = 0, .length = 0,},
+};
+
+static struct imxfb_rgb def_rgb_8 = {
+ .red = {.offset = 0, .length = 8,},
+ .green = {.offset = 0, .length = 8,},
+ .blue = {.offset = 0, .length = 8,},
+ .transp = {.offset = 0, .length = 0,},
+};
+
+static int imxfb_activate_var(struct fb_var_screeninfo *var,
+ struct fb_info *info);
+
+static inline u_int chan_to_field(u_int chan, struct fb_bitfield *bf)
+{
+ chan &= 0xffff;
+ chan >>= 16 - bf->length;
+ return chan << bf->offset;
+}
+
+static int imxfb_setpalettereg(u_int regno, u_int red, u_int green, u_int blue,
+ u_int trans, struct fb_info *info)
+{
+ struct imxfb_info *fbi = info->par;
+ u_int val, ret = 1;
+
+#define CNVT_TOHW(val,width) ((((val)<<(width))+0x7FFF-(val))>>16)
+ if (regno < fbi->palette_size) {
+ val = (CNVT_TOHW(red, 4) << 8) |
+ (CNVT_TOHW(green,4) << 4) |
+ CNVT_TOHW(blue, 4);
+
+ writel(val, fbi->regs + 0x800 + (regno << 2));
+ ret = 0;
+ }
+ return ret;
+}
+
+static int imxfb_setcolreg(u_int regno, u_int red, u_int green, u_int blue,
+ u_int trans, struct fb_info *info)
+{
+ struct imxfb_info *fbi = info->par;
+ unsigned int val;
+ int ret = 1;
+
+ /*
+ * If inverse mode was selected, invert all the colours
+ * rather than the register number. The register number
+ * is what you poke into the framebuffer to produce the
+ * colour you requested.
+ */
+ if (fbi->cmap_inverse) {
+ red = 0xffff - red;
+ green = 0xffff - green;
+ blue = 0xffff - blue;
+ }
+
+ /*
+ * If greyscale is true, then we convert the RGB value
+ * to greyscale no mater what visual we are using.
+ */
+ if (info->var.grayscale)
+ red = green = blue = (19595 * red + 38470 * green +
+ 7471 * blue) >> 16;
+
+ switch (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 = info->pseudo_palette;
+
+ val = chan_to_field(red, &info->var.red);
+ val |= chan_to_field(green, &info->var.green);
+ val |= chan_to_field(blue, &info->var.blue);
+
+ pal[regno] = val;
+ ret = 0;
+ }
+ break;
+
+ case FB_VISUAL_STATIC_PSEUDOCOLOR:
+ case FB_VISUAL_PSEUDOCOLOR:
+ ret = imxfb_setpalettereg(regno, red, green, blue, trans, info);
+ break;
+ }
+
+ return ret;
+}
+
+static const struct imx_fb_videomode *imxfb_find_mode(struct imxfb_info *fbi)
+{
+ struct imx_fb_videomode *m;
+ int i;
+
+ if (!fb_mode)
+ return &fbi->mode[0];
+
+ for (i = 0, m = &fbi->mode[0]; i < fbi->num_modes; i++, m++) {
+ if (!strcmp(m->mode.name, fb_mode))
+ return m;
+ }
+ return NULL;
+}
+
+/*
+ * imxfb_check_var():
+ * Round up in the following order: bits_per_pixel, xres,
+ * yres, xres_virtual, yres_virtual, xoffset, yoffset, grayscale,
+ * bitfields, horizontal timing, vertical timing.
+ */
+static int imxfb_check_var(struct fb_var_screeninfo *var, struct fb_info *info)
+{
+ struct imxfb_info *fbi = info->par;
+ struct imxfb_rgb *rgb;
+ const struct imx_fb_videomode *imxfb_mode;
+ unsigned long lcd_clk;
+ unsigned long long tmp;
+ u32 pcr = 0;
+
+ if (var->xres < MIN_XRES)
+ var->xres = MIN_XRES;
+ if (var->yres < MIN_YRES)
+ var->yres = MIN_YRES;
+
+ imxfb_mode = imxfb_find_mode(fbi);
+ if (!imxfb_mode)
+ return -EINVAL;
+
+ var->xres = imxfb_mode->mode.xres;
+ var->yres = imxfb_mode->mode.yres;
+ var->bits_per_pixel = imxfb_mode->bpp;
+ var->pixclock = imxfb_mode->mode.pixclock;
+ var->hsync_len = imxfb_mode->mode.hsync_len;
+ var->left_margin = imxfb_mode->mode.left_margin;
+ var->right_margin = imxfb_mode->mode.right_margin;
+ var->vsync_len = imxfb_mode->mode.vsync_len;
+ var->upper_margin = imxfb_mode->mode.upper_margin;
+ var->lower_margin = imxfb_mode->mode.lower_margin;
+ var->sync = imxfb_mode->mode.sync;
+ var->xres_virtual = max(var->xres_virtual, var->xres);
+ var->yres_virtual = max(var->yres_virtual, var->yres);
+
+ pr_debug("var->bits_per_pixel=%d\n", var->bits_per_pixel);
+
+ lcd_clk = clk_get_rate(fbi->clk_per);
+
+ tmp = var->pixclock * (unsigned long long)lcd_clk;
+
+ do_div(tmp, 1000000);
+
+ if (do_div(tmp, 1000000) > 500000)
+ tmp++;
+
+ pcr = (unsigned int)tmp;
+
+ if (--pcr > 0x3F) {
+ pcr = 0x3F;
+ printk(KERN_WARNING "Must limit pixel clock to %luHz\n",
+ lcd_clk / pcr);
+ }
+
+ switch (var->bits_per_pixel) {
+ case 32:
+ pcr |= PCR_BPIX_18;
+ rgb = &def_rgb_18;
+ break;
+ case 16:
+ default:
+ if (is_imx1_fb(fbi))
+ pcr |= PCR_BPIX_12;
+ else
+ pcr |= PCR_BPIX_16;
+
+ if (imxfb_mode->pcr & PCR_TFT)
+ rgb = &def_rgb_16_tft;
+ else
+ rgb = &def_rgb_16_stn;
+ break;
+ case 8:
+ pcr |= PCR_BPIX_8;
+ rgb = &def_rgb_8;
+ break;
+ }
+
+ /* add sync polarities */
+ pcr |= imxfb_mode->pcr & ~(0x3f | (7 << 25));
+
+ fbi->pcr = pcr;
+
+ /*
+ * 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;
+
+ pr_debug("RGBT length = %d:%d:%d:%d\n",
+ var->red.length, var->green.length, var->blue.length,
+ var->transp.length);
+
+ pr_debug("RGBT offset = %d:%d:%d:%d\n",
+ var->red.offset, var->green.offset, var->blue.offset,
+ var->transp.offset);
+
+ return 0;
+}
+
+/*
+ * imxfb_set_par():
+ * Set the user defined part of the display for the specified console
+ */
+static int imxfb_set_par(struct fb_info *info)
+{
+ struct imxfb_info *fbi = info->par;
+ struct fb_var_screeninfo *var = &info->var;
+
+ if (var->bits_per_pixel == 16 || var->bits_per_pixel == 32)
+ info->fix.visual = FB_VISUAL_TRUECOLOR;
+ else if (!fbi->cmap_static)
+ info->fix.visual = FB_VISUAL_PSEUDOCOLOR;
+ else {
+ /*
+ * Some people have weird ideas about wanting static
+ * pseudocolor maps. I suspect their user space
+ * applications are broken.
+ */
+ info->fix.visual = FB_VISUAL_STATIC_PSEUDOCOLOR;
+ }
+
+ info->fix.line_length = var->xres_virtual * var->bits_per_pixel / 8;
+ fbi->palette_size = var->bits_per_pixel == 8 ? 256 : 16;
+
+ imxfb_activate_var(var, info);
+
+ return 0;
+}
+
+static void imxfb_enable_controller(struct imxfb_info *fbi)
+{
+
+ if (fbi->enabled)
+ return;
+
+ pr_debug("Enabling LCD controller\n");
+
+ writel(fbi->map_dma, fbi->regs + LCDC_SSA);
+
+ /* panning offset 0 (0 pixel offset) */
+ writel(0x00000000, fbi->regs + LCDC_POS);
+
+ /* disable hardware cursor */
+ writel(readl(fbi->regs + LCDC_CPOS) & ~(CPOS_CC0 | CPOS_CC1),
+ fbi->regs + LCDC_CPOS);
+
+ /*
+ * RMCR_LCDC_EN_MX1 is present on i.MX1 only, but doesn't hurt
+ * on other SoCs
+ */
+ writel(RMCR_LCDC_EN_MX1, fbi->regs + LCDC_RMCR);
+
+ clk_prepare_enable(fbi->clk_ipg);
+ clk_prepare_enable(fbi->clk_ahb);
+ clk_prepare_enable(fbi->clk_per);
+ fbi->enabled = true;
+}
+
+static void imxfb_disable_controller(struct imxfb_info *fbi)
+{
+ if (!fbi->enabled)
+ return;
+
+ pr_debug("Disabling LCD controller\n");
+
+ clk_disable_unprepare(fbi->clk_per);
+ clk_disable_unprepare(fbi->clk_ipg);
+ clk_disable_unprepare(fbi->clk_ahb);
+ fbi->enabled = false;
+
+ writel(0, fbi->regs + LCDC_RMCR);
+}
+
+static int imxfb_blank(int blank, struct fb_info *info)
+{
+ struct imxfb_info *fbi = info->par;
+
+ pr_debug("imxfb_blank: blank=%d\n", blank);
+
+ switch (blank) {
+ case FB_BLANK_POWERDOWN:
+ case FB_BLANK_VSYNC_SUSPEND:
+ case FB_BLANK_HSYNC_SUSPEND:
+ case FB_BLANK_NORMAL:
+ imxfb_disable_controller(fbi);
+ break;
+
+ case FB_BLANK_UNBLANK:
+ imxfb_enable_controller(fbi);
+ break;
+ }
+ return 0;
+}
+
+static struct fb_ops imxfb_ops = {
+ .owner = THIS_MODULE,
+ .fb_check_var = imxfb_check_var,
+ .fb_set_par = imxfb_set_par,
+ .fb_setcolreg = imxfb_setcolreg,
+ .fb_fillrect = cfb_fillrect,
+ .fb_copyarea = cfb_copyarea,
+ .fb_imageblit = cfb_imageblit,
+ .fb_blank = imxfb_blank,
+};
+
+/*
+ * imxfb_activate_var():
+ * Configures LCD Controller based on entries in var parameter. Settings are
+ * only written to the controller if changes were made.
+ */
+static int imxfb_activate_var(struct fb_var_screeninfo *var, struct fb_info *info)
+{
+ struct imxfb_info *fbi = info->par;
+ u32 ymax_mask = is_imx1_fb(fbi) ? YMAX_MASK_IMX1 : YMAX_MASK_IMX21;
+
+ pr_debug("var: xres=%d hslen=%d lm=%d rm=%d\n",
+ var->xres, var->hsync_len,
+ var->left_margin, var->right_margin);
+ pr_debug("var: yres=%d vslen=%d um=%d bm=%d\n",
+ var->yres, var->vsync_len,
+ var->upper_margin, var->lower_margin);
+
+#if DEBUG_VAR
+ if (var->xres < 16 || var->xres > 1024)
+ printk(KERN_ERR "%s: invalid xres %d\n",
+ info->fix.id, var->xres);
+ if (var->hsync_len < 1 || var->hsync_len > 64)
+ printk(KERN_ERR "%s: invalid hsync_len %d\n",
+ info->fix.id, var->hsync_len);
+ if (var->left_margin > 255)
+ printk(KERN_ERR "%s: invalid left_margin %d\n",
+ info->fix.id, var->left_margin);
+ if (var->right_margin > 255)
+ printk(KERN_ERR "%s: invalid right_margin %d\n",
+ info->fix.id, var->right_margin);
+ if (var->yres < 1 || var->yres > ymax_mask)
+ printk(KERN_ERR "%s: invalid yres %d\n",
+ info->fix.id, var->yres);
+ if (var->vsync_len > 100)
+ printk(KERN_ERR "%s: invalid vsync_len %d\n",
+ info->fix.id, var->vsync_len);
+ if (var->upper_margin > 63)
+ printk(KERN_ERR "%s: invalid upper_margin %d\n",
+ info->fix.id, var->upper_margin);
+ if (var->lower_margin > 255)
+ printk(KERN_ERR "%s: invalid lower_margin %d\n",
+ info->fix.id, var->lower_margin);
+#endif
+
+ /* physical screen start address */
+ writel(VPW_VPW(var->xres * var->bits_per_pixel / 8 / 4),
+ fbi->regs + LCDC_VPW);
+
+ writel(HCR_H_WIDTH(var->hsync_len - 1) |
+ HCR_H_WAIT_1(var->right_margin - 1) |
+ HCR_H_WAIT_2(var->left_margin - 3),
+ fbi->regs + LCDC_HCR);
+
+ writel(VCR_V_WIDTH(var->vsync_len) |
+ VCR_V_WAIT_1(var->lower_margin) |
+ VCR_V_WAIT_2(var->upper_margin),
+ fbi->regs + LCDC_VCR);
+
+ writel(SIZE_XMAX(var->xres) | (var->yres & ymax_mask),
+ fbi->regs + LCDC_SIZE);
+
+ writel(fbi->pcr, fbi->regs + LCDC_PCR);
+ if (fbi->pwmr)
+ writel(fbi->pwmr, fbi->regs + LCDC_PWMR);
+ writel(fbi->lscr1, fbi->regs + LCDC_LSCR1);
+
+ /* dmacr = 0 is no valid value, as we need DMA control marks. */
+ if (fbi->dmacr)
+ writel(fbi->dmacr, fbi->regs + LCDC_DMACR);
+
+ return 0;
+}
+
+static int imxfb_init_fbinfo(struct platform_device *pdev)
+{
+ struct imx_fb_platform_data *pdata = dev_get_platdata(&pdev->dev);
+ struct fb_info *info = dev_get_drvdata(&pdev->dev);
+ struct imxfb_info *fbi = info->par;
+ struct device_node *np;
+
+ pr_debug("%s\n",__func__);
+
+ info->pseudo_palette = kmalloc(sizeof(u32) * 16, GFP_KERNEL);
+ if (!info->pseudo_palette)
+ return -ENOMEM;
+
+ memset(fbi, 0, sizeof(struct imxfb_info));
+
+ fbi->devtype = pdev->id_entry->driver_data;
+
+ strlcpy(info->fix.id, IMX_NAME, sizeof(info->fix.id));
+
+ info->fix.type = FB_TYPE_PACKED_PIXELS;
+ info->fix.type_aux = 0;
+ info->fix.xpanstep = 0;
+ info->fix.ypanstep = 0;
+ info->fix.ywrapstep = 0;
+ info->fix.accel = FB_ACCEL_NONE;
+
+ info->var.nonstd = 0;
+ info->var.activate = FB_ACTIVATE_NOW;
+ info->var.height = -1;
+ info->var.width = -1;
+ info->var.accel_flags = 0;
+ info->var.vmode = FB_VMODE_NONINTERLACED;
+
+ info->fbops = &imxfb_ops;
+ info->flags = FBINFO_FLAG_DEFAULT |
+ FBINFO_READS_FAST;
+ if (pdata) {
+ fbi->lscr1 = pdata->lscr1;
+ fbi->dmacr = pdata->dmacr;
+ fbi->pwmr = pdata->pwmr;
+ } else {
+ np = pdev->dev.of_node;
+ info->var.grayscale = of_property_read_bool(np,
+ "cmap-greyscale");
+ fbi->cmap_inverse = of_property_read_bool(np, "cmap-inverse");
+ fbi->cmap_static = of_property_read_bool(np, "cmap-static");
+
+ fbi->lscr1 = IMXFB_LSCR1_DEFAULT;
+
+ of_property_read_u32(np, "fsl,lpccr", &fbi->pwmr);
+
+ of_property_read_u32(np, "fsl,lscr1", &fbi->lscr1);
+
+ of_property_read_u32(np, "fsl,dmacr", &fbi->dmacr);
+ }
+
+ return 0;
+}
+
+static int imxfb_of_read_mode(struct device *dev, struct device_node *np,
+ struct imx_fb_videomode *imxfb_mode)
+{
+ int ret;
+ struct fb_videomode *of_mode = &imxfb_mode->mode;
+ u32 bpp;
+ u32 pcr;
+
+ ret = of_property_read_string(np, "model", &of_mode->name);
+ if (ret)
+ of_mode->name = NULL;
+
+ ret = of_get_fb_videomode(np, of_mode, OF_USE_NATIVE_MODE);
+ if (ret) {
+ dev_err(dev, "Failed to get videomode from DT\n");
+ return ret;
+ }
+
+ ret = of_property_read_u32(np, "bits-per-pixel", &bpp);
+ ret |= of_property_read_u32(np, "fsl,pcr", &pcr);
+
+ if (ret) {
+ dev_err(dev, "Failed to read bpp and pcr from DT\n");
+ return -EINVAL;
+ }
+
+ if (bpp < 1 || bpp > 255) {
+ dev_err(dev, "Bits per pixel have to be between 1 and 255\n");
+ return -EINVAL;
+ }
+
+ imxfb_mode->bpp = bpp;
+ imxfb_mode->pcr = pcr;
+
+ return 0;
+}
+
+static int imxfb_lcd_check_fb(struct lcd_device *lcddev, struct fb_info *fi)
+{
+ struct imxfb_info *fbi = dev_get_drvdata(&lcddev->dev);
+
+ if (!fi || fi->par == fbi)
+ return 1;
+
+ return 0;
+}
+
+static int imxfb_lcd_get_contrast(struct lcd_device *lcddev)
+{
+ struct imxfb_info *fbi = dev_get_drvdata(&lcddev->dev);
+
+ return fbi->pwmr & 0xff;
+}
+
+static int imxfb_lcd_set_contrast(struct lcd_device *lcddev, int contrast)
+{
+ struct imxfb_info *fbi = dev_get_drvdata(&lcddev->dev);
+
+ if (fbi->pwmr && fbi->enabled) {
+ if (contrast > 255)
+ contrast = 255;
+ else if (contrast < 0)
+ contrast = 0;
+
+ fbi->pwmr &= ~0xff;
+ fbi->pwmr |= contrast;
+
+ writel(fbi->pwmr, fbi->regs + LCDC_PWMR);
+ }
+
+ return 0;
+}
+
+static int imxfb_lcd_get_power(struct lcd_device *lcddev)
+{
+ struct imxfb_info *fbi = dev_get_drvdata(&lcddev->dev);
+
+ if (!IS_ERR(fbi->lcd_pwr))
+ return regulator_is_enabled(fbi->lcd_pwr);
+
+ return 1;
+}
+
+static int imxfb_lcd_set_power(struct lcd_device *lcddev, int power)
+{
+ struct imxfb_info *fbi = dev_get_drvdata(&lcddev->dev);
+
+ if (!IS_ERR(fbi->lcd_pwr)) {
+ if (power)
+ return regulator_enable(fbi->lcd_pwr);
+ else
+ return regulator_disable(fbi->lcd_pwr);
+ }
+
+ return 0;
+}
+
+static struct lcd_ops imxfb_lcd_ops = {
+ .check_fb = imxfb_lcd_check_fb,
+ .get_contrast = imxfb_lcd_get_contrast,
+ .set_contrast = imxfb_lcd_set_contrast,
+ .get_power = imxfb_lcd_get_power,
+ .set_power = imxfb_lcd_set_power,
+};
+
+static int imxfb_setup(void)
+{
+ char *opt, *options = NULL;
+
+ if (fb_get_options("imxfb", &options))
+ return -ENODEV;
+
+ if (!options || !*options)
+ return 0;
+
+ while ((opt = strsep(&options, ",")) != NULL) {
+ if (!*opt)
+ continue;
+ else
+ fb_mode = opt;
+ }
+
+ return 0;
+}
+
+static int imxfb_probe(struct platform_device *pdev)
+{
+ struct imxfb_info *fbi;
+ struct lcd_device *lcd;
+ struct fb_info *info;
+ struct imx_fb_platform_data *pdata;
+ struct resource *res;
+ struct imx_fb_videomode *m;
+ const struct of_device_id *of_id;
+ int ret, i;
+ int bytes_per_pixel;
+
+ dev_info(&pdev->dev, "i.MX Framebuffer driver\n");
+
+ ret = imxfb_setup();
+ if (ret < 0)
+ return ret;
+
+ of_id = of_match_device(imxfb_of_dev_id, &pdev->dev);
+ if (of_id)
+ pdev->id_entry = of_id->data;
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ if (!res)
+ return -ENODEV;
+
+ pdata = dev_get_platdata(&pdev->dev);
+
+ info = framebuffer_alloc(sizeof(struct imxfb_info), &pdev->dev);
+ if (!info)
+ return -ENOMEM;
+
+ fbi = info->par;
+
+ platform_set_drvdata(pdev, info);
+
+ ret = imxfb_init_fbinfo(pdev);
+ if (ret < 0)
+ goto failed_init;
+
+ if (pdata) {
+ if (!fb_mode)
+ fb_mode = pdata->mode[0].mode.name;
+
+ fbi->mode = pdata->mode;
+ fbi->num_modes = pdata->num_modes;
+ } else {
+ struct device_node *display_np;
+ fb_mode = NULL;
+
+ display_np = of_parse_phandle(pdev->dev.of_node, "display", 0);
+ if (!display_np) {
+ dev_err(&pdev->dev, "No display defined in devicetree\n");
+ ret = -EINVAL;
+ goto failed_of_parse;
+ }
+
+ /*
+ * imxfb does not support more modes, we choose only the native
+ * mode.
+ */
+ fbi->num_modes = 1;
+
+ fbi->mode = devm_kzalloc(&pdev->dev,
+ sizeof(struct imx_fb_videomode), GFP_KERNEL);
+ if (!fbi->mode) {
+ ret = -ENOMEM;
+ goto failed_of_parse;
+ }
+
+ ret = imxfb_of_read_mode(&pdev->dev, display_np, fbi->mode);
+ if (ret)
+ goto failed_of_parse;
+ }
+
+ /* Calculate maximum bytes used per pixel. In most cases this should
+ * be the same as m->bpp/8 */
+ m = &fbi->mode[0];
+ bytes_per_pixel = (m->bpp + 7) / 8;
+ for (i = 0; i < fbi->num_modes; i++, m++)
+ info->fix.smem_len = max_t(size_t, info->fix.smem_len,
+ m->mode.xres * m->mode.yres * bytes_per_pixel);
+
+ res = request_mem_region(res->start, resource_size(res),
+ DRIVER_NAME);
+ if (!res) {
+ ret = -EBUSY;
+ goto failed_req;
+ }
+
+ fbi->clk_ipg = devm_clk_get(&pdev->dev, "ipg");
+ if (IS_ERR(fbi->clk_ipg)) {
+ ret = PTR_ERR(fbi->clk_ipg);
+ goto failed_getclock;
+ }
+
+ fbi->clk_ahb = devm_clk_get(&pdev->dev, "ahb");
+ if (IS_ERR(fbi->clk_ahb)) {
+ ret = PTR_ERR(fbi->clk_ahb);
+ goto failed_getclock;
+ }
+
+ fbi->clk_per = devm_clk_get(&pdev->dev, "per");
+ if (IS_ERR(fbi->clk_per)) {
+ ret = PTR_ERR(fbi->clk_per);
+ goto failed_getclock;
+ }
+
+ fbi->regs = ioremap(res->start, resource_size(res));
+ if (fbi->regs == NULL) {
+ dev_err(&pdev->dev, "Cannot map frame buffer registers\n");
+ ret = -ENOMEM;
+ goto failed_ioremap;
+ }
+
+ fbi->map_size = PAGE_ALIGN(info->fix.smem_len);
+ info->screen_base = dma_alloc_writecombine(&pdev->dev, fbi->map_size,
+ &fbi->map_dma, GFP_KERNEL);
+
+ if (!info->screen_base) {
+ dev_err(&pdev->dev, "Failed to allocate video RAM: %d\n", ret);
+ ret = -ENOMEM;
+ goto failed_map;
+ }
+
+ info->fix.smem_start = fbi->map_dma;
+
+ if (pdata && pdata->init) {
+ ret = pdata->init(fbi->pdev);
+ if (ret)
+ goto failed_platform_init;
+ }
+
+
+ INIT_LIST_HEAD(&info->modelist);
+ for (i = 0; i < fbi->num_modes; i++)
+ fb_add_videomode(&fbi->mode[i].mode, &info->modelist);
+
+ /*
+ * This makes sure that our colour bitfield
+ * descriptors are correctly initialised.
+ */
+ imxfb_check_var(&info->var, info);
+
+ ret = fb_alloc_cmap(&info->cmap, 1 << info->var.bits_per_pixel, 0);
+ if (ret < 0)
+ goto failed_cmap;
+
+ imxfb_set_par(info);
+ ret = register_framebuffer(info);
+ if (ret < 0) {
+ dev_err(&pdev->dev, "failed to register framebuffer\n");
+ goto failed_register;
+ }
+
+ fbi->lcd_pwr = devm_regulator_get(&pdev->dev, "lcd");
+ if (IS_ERR(fbi->lcd_pwr) && (PTR_ERR(fbi->lcd_pwr) == -EPROBE_DEFER)) {
+ ret = -EPROBE_DEFER;
+ goto failed_lcd;
+ }
+
+ lcd = devm_lcd_device_register(&pdev->dev, "imxfb-lcd", &pdev->dev, fbi,
+ &imxfb_lcd_ops);
+ if (IS_ERR(lcd)) {
+ ret = PTR_ERR(lcd);
+ goto failed_lcd;
+ }
+
+ lcd->props.max_contrast = 0xff;
+
+ imxfb_enable_controller(fbi);
+ fbi->pdev = pdev;
+
+ return 0;
+
+failed_lcd:
+ unregister_framebuffer(info);
+
+failed_register:
+ fb_dealloc_cmap(&info->cmap);
+failed_cmap:
+ if (pdata && pdata->exit)
+ pdata->exit(fbi->pdev);
+failed_platform_init:
+ dma_free_writecombine(&pdev->dev, fbi->map_size, info->screen_base,
+ fbi->map_dma);
+failed_map:
+ iounmap(fbi->regs);
+failed_ioremap:
+failed_getclock:
+ release_mem_region(res->start, resource_size(res));
+failed_req:
+failed_of_parse:
+ kfree(info->pseudo_palette);
+failed_init:
+ framebuffer_release(info);
+ return ret;
+}
+
+static int imxfb_remove(struct platform_device *pdev)
+{
+ struct imx_fb_platform_data *pdata;
+ struct fb_info *info = platform_get_drvdata(pdev);
+ struct imxfb_info *fbi = info->par;
+ struct resource *res;
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+
+ imxfb_disable_controller(fbi);
+
+ unregister_framebuffer(info);
+
+ pdata = dev_get_platdata(&pdev->dev);
+ if (pdata && pdata->exit)
+ pdata->exit(fbi->pdev);
+
+ fb_dealloc_cmap(&info->cmap);
+ kfree(info->pseudo_palette);
+ framebuffer_release(info);
+
+ dma_free_writecombine(&pdev->dev, fbi->map_size, info->screen_base,
+ fbi->map_dma);
+
+ iounmap(fbi->regs);
+ release_mem_region(res->start, resource_size(res));
+
+ return 0;
+}
+
+static int __maybe_unused imxfb_suspend(struct device *dev)
+{
+ struct fb_info *info = dev_get_drvdata(dev);
+ struct imxfb_info *fbi = info->par;
+
+ imxfb_disable_controller(fbi);
+
+ return 0;
+}
+
+static int __maybe_unused imxfb_resume(struct device *dev)
+{
+ struct fb_info *info = dev_get_drvdata(dev);
+ struct imxfb_info *fbi = info->par;
+
+ imxfb_enable_controller(fbi);
+
+ return 0;
+}
+
+static SIMPLE_DEV_PM_OPS(imxfb_pm_ops, imxfb_suspend, imxfb_resume);
+
+static struct platform_driver imxfb_driver = {
+ .driver = {
+ .name = DRIVER_NAME,
+ .of_match_table = imxfb_of_dev_id,
+ .pm = &imxfb_pm_ops,
+ },
+ .probe = imxfb_probe,
+ .remove = imxfb_remove,
+ .id_table = imxfb_devtype,
+};
+module_platform_driver(imxfb_driver);
+
+MODULE_DESCRIPTION("Freescale i.MX framebuffer driver");
+MODULE_AUTHOR("Sascha Hauer, Pengutronix");
+MODULE_LICENSE("GPL");
Code Review / kvmfornfv.git / blobdiff