/* * SuperH Mobile LCDC Framebuffer * * Copyright (c) 2008 Magnus Damm * * 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. */ #include <linux/kernel.h> #include <linux/init.h> #include <linux/delay.h> #include <linux/mm.h> #include <linux/fb.h> #include <linux/clk.h> #include <linux/platform_device.h> #include <linux/dma-mapping.h> #include <asm/sh_mobile_lcdc.h> #define PALETTE_NR 16 struct sh_mobile_lcdc_priv; struct sh_mobile_lcdc_chan { struct sh_mobile_lcdc_priv *lcdc; unsigned long *reg_offs; unsigned long ldmt1r_value; unsigned long enabled; /* ME and SE in LDCNT2R */ struct sh_mobile_lcdc_chan_cfg cfg; u32 pseudo_palette[PALETTE_NR]; struct fb_info info; dma_addr_t dma_handle; }; struct sh_mobile_lcdc_priv { void __iomem *base; struct clk *clk; unsigned long lddckr; struct sh_mobile_lcdc_chan ch[2]; }; /* shared registers */ #define _LDDCKR 0x410 #define _LDDCKSTPR 0x414 #define _LDINTR 0x468 #define _LDSR 0x46c #define _LDCNT1R 0x470 #define _LDCNT2R 0x474 #define _LDDDSR 0x47c #define _LDDWD0R 0x800 #define _LDDRDR 0x840 #define _LDDWAR 0x900 #define _LDDRAR 0x904 /* per-channel registers */ enum { LDDCKPAT1R, LDDCKPAT2R, LDMT1R, LDMT2R, LDMT3R, LDDFR, LDSM1R, LDSA1R, LDMLSR, LDHCNR, LDHSYNR, LDVLNR, LDVSYNR, LDPMR }; static unsigned long lcdc_offs_mainlcd[] = { [LDDCKPAT1R] = 0x400, [LDDCKPAT2R] = 0x404, [LDMT1R] = 0x418, [LDMT2R] = 0x41c, [LDMT3R] = 0x420, [LDDFR] = 0x424, [LDSM1R] = 0x428, [LDSA1R] = 0x430, [LDMLSR] = 0x438, [LDHCNR] = 0x448, [LDHSYNR] = 0x44c, [LDVLNR] = 0x450, [LDVSYNR] = 0x454, [LDPMR] = 0x460, }; static unsigned long lcdc_offs_sublcd[] = { [LDDCKPAT1R] = 0x408, [LDDCKPAT2R] = 0x40c, [LDMT1R] = 0x600, [LDMT2R] = 0x604, [LDMT3R] = 0x608, [LDDFR] = 0x60c, [LDSM1R] = 0x610, [LDSA1R] = 0x618, [LDMLSR] = 0x620, [LDHCNR] = 0x624, [LDHSYNR] = 0x628, [LDVLNR] = 0x62c, [LDVSYNR] = 0x630, [LDPMR] = 0x63c, }; #define START_LCDC 0x00000001 #define LCDC_RESET 0x00000100 #define DISPLAY_BEU 0x00000008 #define LCDC_ENABLE 0x00000001 static void lcdc_write_chan(struct sh_mobile_lcdc_chan *chan, int reg_nr, unsigned long data) { iowrite32(data, chan->lcdc->base + chan->reg_offs[reg_nr]); } static unsigned long lcdc_read_chan(struct sh_mobile_lcdc_chan *chan, int reg_nr) { return ioread32(chan->lcdc->base + chan->reg_offs[reg_nr]); } static void lcdc_write(struct sh_mobile_lcdc_priv *priv, unsigned long reg_offs, unsigned long data) { iowrite32(data, priv->base + reg_offs); } static unsigned long lcdc_read(struct sh_mobile_lcdc_priv *priv, unsigned long reg_offs) { return ioread32(priv->base + reg_offs); } static void lcdc_wait_bit(struct sh_mobile_lcdc_priv *priv, unsigned long reg_offs, unsigned long mask, unsigned long until) { while ((lcdc_read(priv, reg_offs) & mask) != until) cpu_relax(); } static int lcdc_chan_is_sublcd(struct sh_mobile_lcdc_chan *chan) { return chan->cfg.chan == LCDC_CHAN_SUBLCD; } static void lcdc_sys_write_index(void *handle, unsigned long data) { struct sh_mobile_lcdc_chan *ch = handle; lcdc_write(ch->lcdc, _LDDWD0R, data | 0x10000000); lcdc_wait_bit(ch->lcdc, _LDSR, 2, 0); lcdc_write(ch->lcdc, _LDDWAR, 1 | (lcdc_chan_is_sublcd(ch) ? 2 : 0)); } static void lcdc_sys_write_data(void *handle, unsigned long data) { struct sh_mobile_lcdc_chan *ch = handle; lcdc_write(ch->lcdc, _LDDWD0R, data | 0x11000000); lcdc_wait_bit(ch->lcdc, _LDSR, 2, 0); lcdc_write(ch->lcdc, _LDDWAR, 1 | (lcdc_chan_is_sublcd(ch) ? 2 : 0)); } static unsigned long lcdc_sys_read_data(void *handle) { struct sh_mobile_lcdc_chan *ch = handle; lcdc_write(ch->lcdc, _LDDRDR, 0x01000000); lcdc_wait_bit(ch->lcdc, _LDSR, 2, 0); lcdc_write(ch->lcdc, _LDDRAR, 1 | (lcdc_chan_is_sublcd(ch) ? 2 : 0)); udelay(1); return lcdc_read(ch->lcdc, _LDDRDR) & 0xffff; } struct sh_mobile_lcdc_sys_bus_ops sh_mobile_lcdc_sys_bus_ops = { lcdc_sys_write_index, lcdc_sys_write_data, lcdc_sys_read_data, }; static void sh_mobile_lcdc_start_stop(struct sh_mobile_lcdc_priv *priv, int start) { unsigned long tmp = lcdc_read(priv, _LDCNT2R); int k; /* start or stop the lcdc */ if (start) lcdc_write(priv, _LDCNT2R, tmp | START_LCDC); else lcdc_write(priv, _LDCNT2R, tmp & ~START_LCDC); /* wait until power is applied/stopped on all channels */ for (k = 0; k < ARRAY_SIZE(priv->ch); k++) if (lcdc_read(priv, _LDCNT2R) & priv->ch[k].enabled) while (1) { tmp = lcdc_read_chan(&priv->ch[k], LDPMR) & 3; if (start && tmp == 3) break; if (!start && tmp == 0) break; cpu_relax(); } if (!start) lcdc_write(priv, _LDDCKSTPR, 1); /* stop dotclock */ } static int sh_mobile_lcdc_start(struct sh_mobile_lcdc_priv *priv) { struct sh_mobile_lcdc_chan *ch; struct fb_videomode *lcd_cfg; struct sh_mobile_lcdc_board_cfg *board_cfg; unsigned long tmp; int k, m; int ret = 0; /* reset */ lcdc_write(priv, _LDCNT2R, lcdc_read(priv, _LDCNT2R) | LCDC_RESET); lcdc_wait_bit(priv, _LDCNT2R, LCDC_RESET, 0); /* enable LCDC channels */ tmp = lcdc_read(priv, _LDCNT2R); tmp |= priv->ch[0].enabled; tmp |= priv->ch[1].enabled; lcdc_write(priv, _LDCNT2R, tmp); /* read data from external memory, avoid using the BEU for now */ lcdc_write(priv, _LDCNT2R, lcdc_read(priv, _LDCNT2R) & ~DISPLAY_BEU); /* stop the lcdc first */ sh_mobile_lcdc_start_stop(priv, 0); /* configure clocks */ tmp = priv->lddckr; for (k = 0; k < ARRAY_SIZE(priv->ch); k++) { ch = &priv->ch[k]; if (!priv->ch[k].enabled) continue; m = ch->cfg.clock_divider; if (!m) continue; if (m == 1) m = 1 << 6; tmp |= m << (lcdc_chan_is_sublcd(ch) ? 8 : 0); lcdc_write_chan(ch, LDDCKPAT1R, 0x00000000); lcdc_write_chan(ch, LDDCKPAT2R, (1 << (m/2)) - 1); } lcdc_write(priv, _LDDCKR, tmp); /* start dotclock again */ lcdc_write(priv, _LDDCKSTPR, 0); lcdc_wait_bit(priv, _LDDCKSTPR, ~0, 0); /* interrupts are disabled */ lcdc_write(priv, _LDINTR, 0); for (k = 0; k < ARRAY_SIZE(priv->ch); k++) { ch = &priv->ch[k]; lcd_cfg = &ch->cfg.lcd_cfg; if (!ch->enabled) continue; tmp = ch->ldmt1r_value; tmp |= (lcd_cfg->sync & FB_SYNC_VERT_HIGH_ACT) ? 0 : 1 << 28; tmp |= (lcd_cfg->sync & FB_SYNC_HOR_HIGH_ACT) ? 0 : 1 << 27; lcdc_write_chan(ch, LDMT1R, tmp); /* setup SYS bus */ lcdc_write_chan(ch, LDMT2R, ch->cfg.sys_bus_cfg.ldmt2r); lcdc_write_chan(ch, LDMT3R, ch->cfg.sys_bus_cfg.ldmt3r); /* horizontal configuration */ tmp = lcd_cfg->xres + lcd_cfg->hsync_len; tmp += lcd_cfg->left_margin; tmp += lcd_cfg->right_margin; tmp /= 8; /* HTCN */ tmp |= (lcd_cfg->xres / 8) << 16; /* HDCN */ lcdc_write_chan(ch, LDHCNR, tmp); tmp = lcd_cfg->xres; tmp += lcd_cfg->right_margin; tmp /= 8; /* HSYNP */ tmp |= (lcd_cfg->hsync_len / 8) << 16; /* HSYNW */ lcdc_write_chan(ch, LDHSYNR, tmp); /* power supply */ lcdc_write_chan(ch, LDPMR, 0); /* vertical configuration */ tmp = lcd_cfg->yres + lcd_cfg->vsync_len; tmp += lcd_cfg->upper_margin; tmp += lcd_cfg->lower_margin; /* VTLN */ tmp |= lcd_cfg->yres << 16; /* VDLN */ lcdc_write_chan(ch, LDVLNR, tmp); tmp = lcd_cfg->yres; tmp += lcd_cfg->lower_margin; /* VSYNP */ tmp |= lcd_cfg->vsync_len << 16; /* VSYNW */ lcdc_write_chan(ch, LDVSYNR, tmp); board_cfg = &ch->cfg.board_cfg; if (board_cfg->setup_sys) ret = board_cfg->setup_sys(board_cfg->board_data, ch, &sh_mobile_lcdc_sys_bus_ops); if (ret) return ret; } /* --- display_lcdc_data() --- */ lcdc_write(priv, _LDINTR, 0x00000f00); /* word and long word swap */ lcdc_write(priv, _LDDDSR, lcdc_read(priv, _LDDDSR) | 6); for (k = 0; k < ARRAY_SIZE(priv->ch); k++) { ch = &priv->ch[k]; if (!priv->ch[k].enabled) continue; /* set bpp format in PKF[4:0] */ tmp = lcdc_read_chan(ch, LDDFR); tmp &= ~(0x0001001f); tmp |= (priv->ch[k].info.var.bits_per_pixel == 16) ? 3 : 0; lcdc_write_chan(ch, LDDFR, tmp); /* point out our frame buffer */ lcdc_write_chan(ch, LDSA1R, ch->info.fix.smem_start); /* set line size */ lcdc_write_chan(ch, LDMLSR, ch->info.fix.line_length); /* continuous read mode */ lcdc_write_chan(ch, LDSM1R, 0); } /* display output */ lcdc_write(priv, _LDCNT1R, LCDC_ENABLE); /* start the lcdc */ sh_mobile_lcdc_start_stop(priv, 1); /* tell the board code to enable the panel */ for (k = 0; k < ARRAY_SIZE(priv->ch); k++) { ch = &priv->ch[k]; board_cfg = &ch->cfg.board_cfg; if (board_cfg->display_on) board_cfg->display_on(board_cfg->board_data); } return 0; } static void sh_mobile_lcdc_stop(struct sh_mobile_lcdc_priv *priv) { struct sh_mobile_lcdc_chan *ch; struct sh_mobile_lcdc_board_cfg *board_cfg; int k; /* tell the board code to disable the panel */ for (k = 0; k < ARRAY_SIZE(priv->ch); k++) { ch = &priv->ch[k]; board_cfg = &ch->cfg.board_cfg; if (board_cfg->display_off) board_cfg->display_off(board_cfg->board_data); } /* stop the lcdc */ sh_mobile_lcdc_start_stop(priv, 0); } static int sh_mobile_lcdc_check_interface(struct sh_mobile_lcdc_chan *ch) { int ifm, miftyp; switch (ch->cfg.interface_type) { case RGB8: ifm = 0; miftyp = 0; break; case RGB9: ifm = 0; miftyp = 4; break; case RGB12A: ifm = 0; miftyp = 5; break; case RGB12B: ifm = 0; miftyp = 6; break; case RGB16: ifm = 0; miftyp = 7; break; case RGB18: ifm = 0; miftyp = 10; break; case RGB24: ifm = 0; miftyp = 11; break; case SYS8A: ifm = 1; miftyp = 0; break; case SYS8B: ifm = 1; miftyp = 1; break; case SYS8C: ifm = 1; miftyp = 2; break; case SYS8D: ifm = 1; miftyp = 3; break; case SYS9: ifm = 1; miftyp = 4; break; case SYS12: ifm = 1; miftyp = 5; break; case SYS16A: ifm = 1; miftyp = 7; break; case SYS16B: ifm = 1; miftyp = 8; break; case SYS16C: ifm = 1; miftyp = 9; break; case SYS18: ifm = 1; miftyp = 10; break; case SYS24: ifm = 1; miftyp = 11; break; default: goto bad; } /* SUBLCD only supports SYS interface */ if (lcdc_chan_is_sublcd(ch)) { if (ifm == 0) goto bad; else ifm = 0; } ch->ldmt1r_value = (ifm << 12) | miftyp; return 0; bad: return -EINVAL; } static int sh_mobile_lcdc_setup_clocks(struct device *dev, int clock_source, struct sh_mobile_lcdc_priv *priv) { char *str; int icksel; switch (clock_source) { case LCDC_CLK_BUS: str = "bus_clk"; icksel = 0; break; case LCDC_CLK_PERIPHERAL: str = "peripheral_clk"; icksel = 1; break; case LCDC_CLK_EXTERNAL: str = NULL; icksel = 2; break; default: return -EINVAL; } priv->lddckr = icksel << 16; if (str) { priv->clk = clk_get(dev, str); if (IS_ERR(priv->clk)) { dev_err(dev, "cannot get clock %s\n", str); return PTR_ERR(priv->clk); } clk_enable(priv->clk); } return 0; } static int sh_mobile_lcdc_setcolreg(u_int regno, u_int red, u_int green, u_int blue, u_int transp, struct fb_info *info) { u32 *palette = info->pseudo_palette; if (regno >= PALETTE_NR) return -EINVAL; /* only FB_VISUAL_TRUECOLOR supported */ red >>= 16 - info->var.red.length; green >>= 16 - info->var.green.length; blue >>= 16 - info->var.blue.length; transp >>= 16 - info->var.transp.length; palette[regno] = (red << info->var.red.offset) | (green << info->var.green.offset) | (blue << info->var.blue.offset) | (transp << info->var.transp.offset); return 0; } static struct fb_fix_screeninfo sh_mobile_lcdc_fix = { .id = "SH Mobile LCDC", .type = FB_TYPE_PACKED_PIXELS, .visual = FB_VISUAL_TRUECOLOR, .accel = FB_ACCEL_NONE, }; static struct fb_ops sh_mobile_lcdc_ops = { .fb_setcolreg = sh_mobile_lcdc_setcolreg, .fb_fillrect = cfb_fillrect, .fb_copyarea = cfb_copyarea, .fb_imageblit = cfb_imageblit, }; static int sh_mobile_lcdc_set_bpp(struct fb_var_screeninfo *var, int bpp) { switch (bpp) { case 16: /* PKF[4:0] = 00011 - RGB 565 */ var->red.offset = 11; var->red.length = 5; var->green.offset = 5; var->green.length = 6; var->blue.offset = 0; var->blue.length = 5; var->transp.offset = 0; var->transp.length = 0; break; case 32: /* PKF[4:0] = 00000 - RGB 888 * sh7722 pdf says 00RRGGBB but reality is GGBB00RR * this may be because LDDDSR has word swap enabled.. */ var->red.offset = 0; var->red.length = 8; var->green.offset = 24; var->green.length = 8; var->blue.offset = 16; var->blue.length = 8; var->transp.offset = 0; var->transp.length = 0; break; default: return -EINVAL; } var->bits_per_pixel = bpp; var->red.msb_right = 0; var->green.msb_right = 0; var->blue.msb_right = 0; var->transp.msb_right = 0; return 0; } static int sh_mobile_lcdc_remove(struct platform_device *pdev); static int __init sh_mobile_lcdc_probe(struct platform_device *pdev) { struct fb_info *info; struct sh_mobile_lcdc_priv *priv; struct sh_mobile_lcdc_info *pdata; struct sh_mobile_lcdc_chan_cfg *cfg; struct resource *res; int error; void *buf; int i, j; if (!pdev->dev.platform_data) { dev_err(&pdev->dev, "no platform data defined\n"); error = -EINVAL; goto err0; } res = platform_get_resource(pdev, IORESOURCE_MEM, 0); if (res == NULL) { dev_err(&pdev->dev, "cannot find IO resource\n"); error = -ENOENT; goto err0; } priv = kzalloc(sizeof(*priv), GFP_KERNEL); if (!priv) { dev_err(&pdev->dev, "cannot allocate device data\n"); error = -ENOMEM; goto err0; } platform_set_drvdata(pdev, priv); pdata = pdev->dev.platform_data; j = 0; for (i = 0; i < ARRAY_SIZE(pdata->ch); i++) { priv->ch[j].lcdc = priv; memcpy(&priv->ch[j].cfg, &pdata->ch[i], sizeof(pdata->ch[i])); error = sh_mobile_lcdc_check_interface(&priv->ch[i]); if (error) { dev_err(&pdev->dev, "unsupported interface type\n"); goto err1; } switch (pdata->ch[i].chan) { case LCDC_CHAN_MAINLCD: priv->ch[j].enabled = 1 << 1; priv->ch[j].reg_offs = lcdc_offs_mainlcd; j++; break; case LCDC_CHAN_SUBLCD: priv->ch[j].enabled = 1 << 2; priv->ch[j].reg_offs = lcdc_offs_sublcd; j++; break; } } if (!j) { dev_err(&pdev->dev, "no channels defined\n"); error = -EINVAL; goto err1; } error = sh_mobile_lcdc_setup_clocks(&pdev->dev, pdata->clock_source, priv); if (error) { dev_err(&pdev->dev, "unable to setup clocks\n"); goto err1; } priv->lddckr = pdata->lddckr; priv->base = ioremap_nocache(res->start, (res->end - res->start) + 1); for (i = 0; i < j; i++) { info = &priv->ch[i].info; cfg = &priv->ch[i].cfg; info->fbops = &sh_mobile_lcdc_ops; info->var.xres = info->var.xres_virtual = cfg->lcd_cfg.xres; info->var.yres = info->var.yres_virtual = cfg->lcd_cfg.yres; info->var.width = cfg->lcd_size_cfg.width; info->var.height = cfg->lcd_size_cfg.height; info->var.activate = FB_ACTIVATE_NOW; error = sh_mobile_lcdc_set_bpp(&info->var, cfg->bpp); if (error) break; info->fix = sh_mobile_lcdc_fix; info->fix.line_length = cfg->lcd_cfg.xres * (cfg->bpp / 8); info->fix.smem_len = info->fix.line_length * cfg->lcd_cfg.yres; buf = dma_alloc_coherent(&pdev->dev, info->fix.smem_len, &priv->ch[i].dma_handle, GFP_KERNEL); if (!buf) { dev_err(&pdev->dev, "unable to allocate buffer\n"); error = -ENOMEM; break; } info->pseudo_palette = &priv->ch[i].pseudo_palette; info->flags = FBINFO_FLAG_DEFAULT; error = fb_alloc_cmap(&info->cmap, PALETTE_NR, 0); if (error < 0) { dev_err(&pdev->dev, "unable to allocate cmap\n"); dma_free_coherent(&pdev->dev, info->fix.smem_len, buf, priv->ch[i].dma_handle); break; } memset(buf, 0, info->fix.smem_len); info->fix.smem_start = priv->ch[i].dma_handle; info->screen_base = buf; info->device = &pdev->dev; } if (error) goto err1; error = sh_mobile_lcdc_start(priv); if (error) { dev_err(&pdev->dev, "unable to start hardware\n"); goto err1; } for (i = 0; i < j; i++) { error = register_framebuffer(&priv->ch[i].info); if (error < 0) goto err1; } for (i = 0; i < j; i++) { info = &priv->ch[i].info; dev_info(info->dev, "registered %s/%s as %dx%d %dbpp.\n", pdev->name, (priv->ch[i].cfg.chan == LCDC_CHAN_MAINLCD) ? "mainlcd" : "sublcd", (int) priv->ch[i].cfg.lcd_cfg.xres, (int) priv->ch[i].cfg.lcd_cfg.yres, priv->ch[i].cfg.bpp); } return 0; err1: sh_mobile_lcdc_remove(pdev); err0: return error; } static int sh_mobile_lcdc_remove(struct platform_device *pdev) { struct sh_mobile_lcdc_priv *priv = platform_get_drvdata(pdev); struct fb_info *info; int i; for (i = 0; i < ARRAY_SIZE(priv->ch); i++) if (priv->ch[i].info.dev) unregister_framebuffer(&priv->ch[i].info); sh_mobile_lcdc_stop(priv); for (i = 0; i < ARRAY_SIZE(priv->ch); i++) { info = &priv->ch[i].info; if (!info->device) continue; dma_free_coherent(&pdev->dev, info->fix.smem_len, info->screen_base, priv->ch[i].dma_handle); fb_dealloc_cmap(&info->cmap); } if (priv->clk) { clk_disable(priv->clk); clk_put(priv->clk); } if (priv->base) iounmap(priv->base); kfree(priv); return 0; } static struct platform_driver sh_mobile_lcdc_driver = { .driver = { .name = "sh_mobile_lcdc_fb", .owner = THIS_MODULE, }, .probe = sh_mobile_lcdc_probe, .remove = sh_mobile_lcdc_remove, }; static int __init sh_mobile_lcdc_init(void) { return platform_driver_register(&sh_mobile_lcdc_driver); } static void __exit sh_mobile_lcdc_exit(void) { platform_driver_unregister(&sh_mobile_lcdc_driver); } module_init(sh_mobile_lcdc_init); module_exit(sh_mobile_lcdc_exit); MODULE_DESCRIPTION("SuperH Mobile LCDC Framebuffer driver"); MODULE_AUTHOR("Magnus Damm <damm@opensource.se>"); MODULE_LICENSE("GPL v2");