diff options
Diffstat (limited to 'kernel/drivers/video/fbdev/geode/display_gx1.c')
| -rw-r--r-- | kernel/drivers/video/fbdev/geode/display_gx1.c | 214 |
1 files changed, 214 insertions, 0 deletions
diff --git a/kernel/drivers/video/fbdev/geode/display_gx1.c b/kernel/drivers/video/fbdev/geode/display_gx1.c new file mode 100644 index 000000000..926d53eeb --- /dev/null +++ b/kernel/drivers/video/fbdev/geode/display_gx1.c @@ -0,0 +1,214 @@ +/* + * drivers/video/geode/display_gx1.c + * -- Geode GX1 display controller + * + * Copyright (C) 2005 Arcom Control Systems Ltd. + * + * Based on AMD's original 2.4 driver: + * Copyright (C) 2004 Advanced Micro Devices, Inc. + * + * 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. + */ +#include <linux/spinlock.h> +#include <linux/fb.h> +#include <linux/delay.h> +#include <asm/io.h> +#include <asm/div64.h> +#include <asm/delay.h> + +#include "geodefb.h" +#include "display_gx1.h" + +static DEFINE_SPINLOCK(gx1_conf_reg_lock); + +static u8 gx1_read_conf_reg(u8 reg) +{ + u8 val, ccr3; + unsigned long flags; + + spin_lock_irqsave(&gx1_conf_reg_lock, flags); + + outb(CONFIG_CCR3, 0x22); + ccr3 = inb(0x23); + outb(CONFIG_CCR3, 0x22); + outb(ccr3 | CONFIG_CCR3_MAPEN, 0x23); + outb(reg, 0x22); + val = inb(0x23); + outb(CONFIG_CCR3, 0x22); + outb(ccr3, 0x23); + + spin_unlock_irqrestore(&gx1_conf_reg_lock, flags); + + return val; +} + +unsigned gx1_gx_base(void) +{ + return (gx1_read_conf_reg(CONFIG_GCR) & 0x03) << 30; +} + +int gx1_frame_buffer_size(void) +{ + void __iomem *mc_regs; + u32 bank_cfg; + int d; + unsigned dram_size = 0, fb_base; + + mc_regs = ioremap(gx1_gx_base() + 0x8400, 0x100); + if (!mc_regs) + return -ENOMEM; + + + /* Calculate the total size of both DIMM0 and DIMM1. */ + bank_cfg = readl(mc_regs + MC_BANK_CFG); + + for (d = 0; d < 2; d++) { + if ((bank_cfg & MC_BCFG_DIMM0_PG_SZ_MASK) != MC_BCFG_DIMM0_PG_SZ_NO_DIMM) + dram_size += 0x400000 << ((bank_cfg & MC_BCFG_DIMM0_SZ_MASK) >> 8); + bank_cfg >>= 16; /* look at DIMM1 next */ + } + + fb_base = (readl(mc_regs + MC_GBASE_ADD) & MC_GADD_GBADD_MASK) << 19; + + iounmap(mc_regs); + + return dram_size - fb_base; +} + +static void gx1_set_mode(struct fb_info *info) +{ + struct geodefb_par *par = info->par; + u32 gcfg, tcfg, ocfg, dclk_div, val; + int hactive, hblankstart, hsyncstart, hsyncend, hblankend, htotal; + int vactive, vblankstart, vsyncstart, vsyncend, vblankend, vtotal; + + /* Unlock the display controller registers. */ + readl(par->dc_regs + DC_UNLOCK); + writel(DC_UNLOCK_CODE, par->dc_regs + DC_UNLOCK); + + gcfg = readl(par->dc_regs + DC_GENERAL_CFG); + tcfg = readl(par->dc_regs + DC_TIMING_CFG); + + /* Blank the display and disable the timing generator. */ + tcfg &= ~(DC_TCFG_BLKE | DC_TCFG_TGEN); + writel(tcfg, par->dc_regs + DC_TIMING_CFG); + + /* Wait for pending memory requests before disabling the FIFO load. */ + udelay(100); + + /* Disable FIFO load and compression. */ + gcfg &= ~(DC_GCFG_DFLE | DC_GCFG_CMPE | DC_GCFG_DECE); + writel(gcfg, par->dc_regs + DC_GENERAL_CFG); + + /* Setup DCLK and its divisor. */ + gcfg &= ~DC_GCFG_DCLK_MASK; + writel(gcfg, par->dc_regs + DC_GENERAL_CFG); + + par->vid_ops->set_dclk(info); + + dclk_div = DC_GCFG_DCLK_DIV_1; /* FIXME: may need to divide DCLK by 2 sometimes? */ + gcfg |= dclk_div; + writel(gcfg, par->dc_regs + DC_GENERAL_CFG); + + /* Wait for the clock generatation to settle. This is needed since + * some of the register writes that follow require that clock to be + * present. */ + udelay(1000); /* FIXME: seems a little long */ + + /* + * Setup new mode. + */ + + /* Clear all unused feature bits. */ + gcfg = DC_GCFG_VRDY | dclk_div; + + /* Set FIFO priority (default 6/5) and enable. */ + /* FIXME: increase fifo priority for 1280x1024 modes? */ + gcfg |= (6 << DC_GCFG_DFHPEL_POS) | (5 << DC_GCFG_DFHPSL_POS) | DC_GCFG_DFLE; + + /* FIXME: Set pixel and line double bits if necessary. */ + + /* Framebuffer start offset. */ + writel(0, par->dc_regs + DC_FB_ST_OFFSET); + + /* Line delta and line buffer length. */ + writel(info->fix.line_length >> 2, par->dc_regs + DC_LINE_DELTA); + writel(((info->var.xres * info->var.bits_per_pixel/8) >> 3) + 2, + par->dc_regs + DC_BUF_SIZE); + + /* Output configuration. Enable panel data, set pixel format. */ + ocfg = DC_OCFG_PCKE | DC_OCFG_PDEL | DC_OCFG_PDEH; + if (info->var.bits_per_pixel == 8) ocfg |= DC_OCFG_8BPP; + + /* Enable timing generator, sync and FP data. */ + tcfg = DC_TCFG_FPPE | DC_TCFG_HSYE | DC_TCFG_VSYE | DC_TCFG_BLKE + | DC_TCFG_TGEN; + + /* Horizontal and vertical timings. */ + hactive = info->var.xres; + hblankstart = hactive; + hsyncstart = hblankstart + info->var.right_margin; + hsyncend = hsyncstart + info->var.hsync_len; + hblankend = hsyncend + info->var.left_margin; + htotal = hblankend; + + vactive = info->var.yres; + vblankstart = vactive; + vsyncstart = vblankstart + info->var.lower_margin; + vsyncend = vsyncstart + info->var.vsync_len; + vblankend = vsyncend + info->var.upper_margin; + vtotal = vblankend; + + val = (hactive - 1) | ((htotal - 1) << 16); + writel(val, par->dc_regs + DC_H_TIMING_1); + val = (hblankstart - 1) | ((hblankend - 1) << 16); + writel(val, par->dc_regs + DC_H_TIMING_2); + val = (hsyncstart - 1) | ((hsyncend - 1) << 16); + writel(val, par->dc_regs + DC_H_TIMING_3); + writel(val, par->dc_regs + DC_FP_H_TIMING); + val = (vactive - 1) | ((vtotal - 1) << 16); + writel(val, par->dc_regs + DC_V_TIMING_1); + val = (vblankstart - 1) | ((vblankend - 1) << 16); + writel(val, par->dc_regs + DC_V_TIMING_2); + val = (vsyncstart - 1) | ((vsyncend - 1) << 16); + writel(val, par->dc_regs + DC_V_TIMING_3); + val = (vsyncstart - 2) | ((vsyncend - 2) << 16); + writel(val, par->dc_regs + DC_FP_V_TIMING); + + /* Write final register values. */ + writel(ocfg, par->dc_regs + DC_OUTPUT_CFG); + writel(tcfg, par->dc_regs + DC_TIMING_CFG); + udelay(1000); /* delay after TIMING_CFG. FIXME: perhaps a little long */ + writel(gcfg, par->dc_regs + DC_GENERAL_CFG); + + par->vid_ops->configure_display(info); + + /* Relock display controller registers */ + writel(0, par->dc_regs + DC_UNLOCK); + + /* FIXME: write line_length and bpp to Graphics Pipeline GP_BLT_STATUS + * register. */ +} + +static void gx1_set_hw_palette_reg(struct fb_info *info, unsigned regno, + unsigned red, unsigned green, unsigned blue) +{ + struct geodefb_par *par = info->par; + int val; + + /* Hardware palette is in RGB 6-6-6 format. */ + val = (red << 2) & 0x3f000; + val |= (green >> 4) & 0x00fc0; + val |= (blue >> 10) & 0x0003f; + + writel(regno, par->dc_regs + DC_PAL_ADDRESS); + writel(val, par->dc_regs + DC_PAL_DATA); +} + +struct geode_dc_ops gx1_dc_ops = { + .set_mode = gx1_set_mode, + .set_palette_reg = gx1_set_hw_palette_reg, +}; |