lxfb: GEODE: Add framebuffer support for the AMD Geode LX

Add framebuffer support for the AMD Geode LX graphics engine.

Signed-off-by: Jordan Crouse <jordan.crouse@amd.com>
Signed-off-by: Antonino Daplas <adaplas@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 536 insertions, 0 deletions

diff --git a/drivers/video/geode/lxfb_ops.c b/drivers/video/geode/lxfb_ops.c
new file mode 100644
index 000000000000..4fbc99be96ef
--- /dev/null
+++ b/drivers/video/geode/lxfb_ops.c
@@ -0,0 +1,536 @@
+/* Geode LX framebuffer driver
+ *
+ * Copyright (C) 2006-2007, 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/kernel.h>
+#include <linux/errno.h>
+#include <linux/fb.h>
+#include <linux/uaccess.h>
+#include <linux/delay.h>
+
+#include "lxfb.h"
+
+/* TODO
+ * Support panel scaling
+ * Add acceleration
+ * Add support for interlacing (TV out)
+ * Support compression
+ */
+
+/* This is the complete list of PLL frequencies that we can set -
+ * we will choose the closest match to the incoming clock.
+ * freq is the frequency of the dotclock * 1000 (for example,
+ * 24823 = 24.983 Mhz).
+ * pllval is the corresponding PLL value
+*/
+
+static const struct {
+  unsigned int pllval;
+  unsigned int freq;
+} pll_table[] = {
+  { 0x000031AC, 24923 },
+  { 0x0000215D, 25175 },
+  { 0x00001087, 27000 },
+  { 0x0000216C, 28322 },
+  { 0x0000218D, 28560 },
+  { 0x000010C9, 31200 },
+  { 0x00003147, 31500 },
+  { 0x000010A7, 33032 },
+  { 0x00002159, 35112 },
+  { 0x00004249, 35500 },
+  { 0x00000057, 36000 },
+  { 0x0000219A, 37889 },
+  { 0x00002158, 39168 },
+  { 0x00000045, 40000 },
+  { 0x00000089, 43163 },
+  { 0x000010E7, 44900 },
+  { 0x00002136, 45720 },
+  { 0x00003207, 49500 },
+  { 0x00002187, 50000 },
+  { 0x00004286, 56250 },
+  { 0x000010E5, 60065 },
+  { 0x00004214, 65000 },
+  { 0x00001105, 68179 },
+  { 0x000031E4, 74250 },
+  { 0x00003183, 75000 },
+  { 0x00004284, 78750 },
+  { 0x00001104, 81600 },
+  { 0x00006363, 94500 },
+  { 0x00005303, 97520 },
+  { 0x00002183, 100187 },
+  { 0x00002122, 101420 },
+  { 0x00001081, 108000 },
+  { 0x00006201, 113310 },
+  { 0x00000041, 119650 },
+  { 0x000041A1, 129600 },
+  { 0x00002182, 133500 },
+  { 0x000041B1, 135000 },
+  { 0x00000051, 144000 },
+  { 0x000041E1, 148500 },
+  { 0x000062D1, 157500 },
+  { 0x000031A1, 162000 },
+  { 0x00000061, 169203 },
+  { 0x00004231, 172800 },
+  { 0x00002151, 175500 },
+  { 0x000052E1, 189000 },
+  { 0x00000071, 192000 },
+  { 0x00003201, 198000 },
+  { 0x00004291, 202500 },
+  { 0x00001101, 204750 },
+  { 0x00007481, 218250 },
+  { 0x00004170, 229500 },
+  { 0x00006210, 234000 },
+  { 0x00003140, 251182 },
+  { 0x00006250, 261000 },
+  { 0x000041C0, 278400 },
+  { 0x00005220, 280640 },
+  { 0x00000050, 288000 },
+  { 0x000041E0, 297000 },
+  { 0x00002130, 320207 }
+};
+
+
+static void lx_set_dotpll(u32 pllval)
+{
+        u32 dotpll_lo, dotpll_hi;
+        int i;
+
+        rdmsr(MSR_LX_GLCP_DOTPLL, dotpll_lo, dotpll_hi);
+
+        if ((dotpll_lo & GLCP_DOTPLL_LOCK) && (dotpll_hi == pllval))
+                return;
+
+        dotpll_hi = pllval;
+        dotpll_lo &= ~(GLCP_DOTPLL_BYPASS | GLCP_DOTPLL_HALFPIX);
+        dotpll_lo |= GLCP_DOTPLL_RESET;
+
+        wrmsr(MSR_LX_GLCP_DOTPLL, dotpll_lo, dotpll_hi);
+
+        /* Wait 100us for the PLL to lock */
+
+        udelay(100);
+
+        /* Now, loop for the lock bit */
+
+        for (i = 0; i < 1000; i++) {
+                rdmsr(MSR_LX_GLCP_DOTPLL, dotpll_lo, dotpll_hi);
+                if (dotpll_lo & GLCP_DOTPLL_LOCK)
+                        break;
+        }
+
+        /* Clear the reset bit */
+
+        dotpll_lo &= ~GLCP_DOTPLL_RESET;
+        wrmsr(MSR_LX_GLCP_DOTPLL, dotpll_lo, dotpll_hi);
+}
+
+/* Set the clock based on the frequency specified by the current mode */
+
+static void lx_set_clock(struct fb_info *info)
+{
+        unsigned int diff, min, best = 0;
+        unsigned int freq, i;
+
+        freq = (unsigned int) (0x3b9aca00 / info->var.pixclock);
+
+        min = abs(pll_table[0].freq - freq);
+
+        for (i = 0; i < ARRAY_SIZE(pll_table); i++) {
+                diff = abs(pll_table[i].freq - freq);
+                if (diff < min) {
+                        min = diff;
+                        best = i;
+                }
+        }
+
+        lx_set_dotpll(pll_table[best].pllval & 0x7FFF);
+}
+
+static void lx_graphics_disable(struct fb_info *info)
+{
+        struct lxfb_par *par = info->par;
+        unsigned int val, gcfg;
+
+        /* Note:  This assumes that the video is in a quitet state */
+
+        writel(0, par->df_regs + DF_ALPHA_CONTROL_1);
+        writel(0, par->df_regs + DF_ALPHA_CONTROL_1 + 32);
+        writel(0, par->df_regs + DF_ALPHA_CONTROL_1 + 64);
+
+        /* Turn off the VGA and video enable */
+        val = readl (par->dc_regs + DC_GENERAL_CFG) &
+                ~(DC_GCFG_VGAE | DC_GCFG_VIDE);
+
+        writel(val, par->dc_regs + DC_GENERAL_CFG);
+
+        val = readl(par->df_regs + DF_VIDEO_CFG) & ~DF_VCFG_VID_EN;
+        writel(val, par->df_regs + DF_VIDEO_CFG);
+
+        writel( DC_IRQ_MASK | DC_VSYNC_IRQ_MASK |
+                DC_IRQ_STATUS | DC_VSYNC_IRQ_STATUS,
+                par->dc_regs + DC_IRQ);
+
+        val = readl(par->dc_regs + DC_GENLCK_CTRL) & ~DC_GENLCK_ENABLE;
+        writel(val, par->dc_regs + DC_GENLCK_CTRL);
+
+        val = readl(par->dc_regs + DC_COLOR_KEY) & ~DC_CLR_KEY_ENABLE;
+        writel(val & ~DC_CLR_KEY_ENABLE, par->dc_regs + DC_COLOR_KEY);
+
+        /* We don't actually blank the panel, due to the long latency
+           involved with bringing it back */
+
+        val = readl(par->df_regs + DF_MISC) | DF_MISC_DAC_PWRDN;
+        writel(val, par->df_regs + DF_MISC);
+
+        /* Turn off the display */
+
+        val = readl(par->df_regs + DF_DISPLAY_CFG);
+        writel(val & ~(DF_DCFG_CRT_EN | DF_DCFG_HSYNC_EN | DF_DCFG_VSYNC_EN |
+                       DF_DCFG_DAC_BL_EN), par->df_regs + DF_DISPLAY_CFG);
+
+        gcfg = readl(par->dc_regs + DC_GENERAL_CFG);
+        gcfg &= ~(DC_GCFG_CMPE | DC_GCFG_DECE);
+        writel(gcfg, par->dc_regs + DC_GENERAL_CFG);
+
+        /* Turn off the TGEN */
+        val = readl(par->dc_regs + DC_DISPLAY_CFG);
+        val &= ~DC_DCFG_TGEN;
+        writel(val, par->dc_regs + DC_DISPLAY_CFG);
+
+        /* Wait 1000 usecs to ensure that the TGEN is clear */
+        udelay(1000);
+
+        /* Turn off the FIFO loader */
+
+        gcfg &= ~DC_GCFG_DFLE;
+        writel(gcfg, par->dc_regs + DC_GENERAL_CFG);
+
+        /* Lastly, wait for the GP to go idle */
+
+        do {
+                val = readl(par->gp_regs + GP_BLT_STATUS);
+        } while ((val & GP_BS_BLT_BUSY) || !(val & GP_BS_CB_EMPTY));
+}
+
+static void lx_graphics_enable(struct fb_info *info)
+{
+        struct lxfb_par *par = info->par;
+        u32 temp, config;
+
+        /* Set the video request register */
+        writel(0, par->df_regs + DF_VIDEO_REQUEST);
+
+        /* Set up the polarities */
+
+        config = readl(par->df_regs + DF_DISPLAY_CFG);
+
+        config &= ~(DF_DCFG_CRT_SYNC_SKW_MASK | DF_DCFG_PWR_SEQ_DLY_MASK |
+                  DF_DCFG_CRT_HSYNC_POL     | DF_DCFG_CRT_VSYNC_POL);
+
+        config |= (DF_DCFG_CRT_SYNC_SKW_INIT | DF_DCFG_PWR_SEQ_DLY_INIT  |
+                   DF_DCFG_GV_PAL_BYP);
+
+        if (info->var.sync & FB_SYNC_HOR_HIGH_ACT)
+                config |= DF_DCFG_CRT_HSYNC_POL;
+
+        if (info->var.sync & FB_SYNC_VERT_HIGH_ACT)
+                config |= DF_DCFG_CRT_VSYNC_POL;
+
+        if (par->output & OUTPUT_PANEL) {
+                u32 msrlo, msrhi;
+
+                writel(DF_DEFAULT_TFT_PMTIM1,
+                       par->df_regs + DF_PANEL_TIM1);
+                writel(DF_DEFAULT_TFT_PMTIM2,
+                       par->df_regs + DF_PANEL_TIM2);
+                writel(DF_DEFAULT_TFT_DITHCTL,
+                       par->df_regs + DF_DITHER_CONTROL);
+
+                msrlo = DF_DEFAULT_TFT_PAD_SEL_LOW;
+                msrhi = DF_DEFAULT_TFT_PAD_SEL_HIGH;
+
+                wrmsr(MSR_LX_DF_PADSEL, msrlo, msrhi);
+        }
+
+        if (par->output & OUTPUT_CRT) {
+                config |= DF_DCFG_CRT_EN   | DF_DCFG_HSYNC_EN |
+                        DF_DCFG_VSYNC_EN | DF_DCFG_DAC_BL_EN;
+        }
+
+        writel(config, par->df_regs + DF_DISPLAY_CFG);
+
+        /* Turn the CRT dacs back on */
+
+        if (par->output & OUTPUT_CRT) {
+                temp = readl(par->df_regs + DF_MISC);
+                temp &= ~(DF_MISC_DAC_PWRDN  | DF_MISC_A_PWRDN);
+                writel(temp, par->df_regs + DF_MISC);
+        }
+
+        /* Turn the panel on (if it isn't already) */
+
+        if (par->output & OUTPUT_PANEL) {
+                temp = readl(par->df_regs + DF_FP_PM);
+
+                if (!(temp & 0x09))
+                        writel(temp | DF_FP_PM_P, par->df_regs + DF_FP_PM);
+        }
+
+        temp = readl(par->df_regs + DF_MISC);
+        temp = readl(par->df_regs + DF_DISPLAY_CFG);
+}
+
+unsigned int lx_framebuffer_size(void)
+{
+        unsigned int val;
+
+        /* The frame buffer size is reported by a VSM in VSA II */
+        /* Virtual Register Class    = 0x02                     */
+        /* VG_MEM_SIZE (1MB units)   = 0x00                     */
+
+        outw(0xFC53, 0xAC1C);
+        outw(0x0200, 0xAC1C);
+
+        val = (unsigned int)(inw(0xAC1E)) & 0xFE;
+        return (val << 20);
+}
+
+void lx_set_mode(struct fb_info *info)
+{
+        struct lxfb_par *par = info->par;
+        u64 msrval;
+
+        unsigned int max, dv, val, size;
+
+        unsigned int gcfg, dcfg;
+        int hactive, hblankstart, hsyncstart, hsyncend, hblankend, htotal;
+        int vactive, vblankstart, vsyncstart, vsyncend, vblankend, vtotal;
+
+        /* Unlock the DC registers */
+        writel(DC_UNLOCK_CODE, par->dc_regs + DC_UNLOCK);
+
+        lx_graphics_disable(info);
+
+        lx_set_clock(info);
+
+        /* Set output mode */
+
+        rdmsrl(MSR_LX_DF_GLCONFIG, msrval);
+        msrval &= ~DF_CONFIG_OUTPUT_MASK;
+
+        if (par->output & OUTPUT_PANEL) {
+                msrval |= DF_OUTPUT_PANEL;
+
+                if (par->output & OUTPUT_CRT)
+                        msrval |= DF_SIMULTANEOUS_CRT_AND_FP;
+                else
+                        msrval &= ~DF_SIMULTANEOUS_CRT_AND_FP;
+        } else {
+                msrval |= DF_OUTPUT_CRT;
+        }
+
+        wrmsrl(MSR_LX_DF_GLCONFIG, msrval);
+
+        /* Clear the various buffers */
+        /* FIXME:  Adjust for panning here */
+
+        writel(0, par->dc_regs + DC_FB_START);
+        writel(0, par->dc_regs + DC_CB_START);
+        writel(0, par->dc_regs + DC_CURSOR_START);
+
+        /* FIXME: Add support for interlacing */
+        /* FIXME: Add support for scaling */
+
+        val = readl(par->dc_regs + DC_GENLCK_CTRL);
+        val &= ~(DC_GC_ALPHA_FLICK_ENABLE |
+                 DC_GC_FLICKER_FILTER_ENABLE | DC_GC_FLICKER_FILTER_MASK);
+
+        /* Default scaling params */
+
+        writel((0x4000 << 16) | 0x4000, par->dc_regs + DC_GFX_SCALE);
+        writel(0, par->dc_regs + DC_IRQ_FILT_CTL);
+        writel(val, par->dc_regs + DC_GENLCK_CTRL);
+
+        /* FIXME:  Support compression */
+
+        if (info->fix.line_length > 4096)
+                dv = DC_DV_LINE_SIZE_8192;
+        else if (info->fix.line_length > 2048)
+                dv = DC_DV_LINE_SIZE_4096;
+        else if (info->fix.line_length > 1024)
+                dv = DC_DV_LINE_SIZE_2048;
+        else
+                dv = DC_DV_LINE_SIZE_1024;
+
+        max = info->fix.line_length * info->var.yres;
+        max = (max + 0x3FF) & 0xFFFFFC00;
+
+        writel(max | DC_DV_TOP_ENABLE, par->dc_regs + DC_DV_TOP);
+
+        val = readl(par->dc_regs + DC_DV_CTL) & ~DC_DV_LINE_SIZE_MASK;
+        writel(val | dv, par->dc_regs + DC_DV_CTL);
+
+        size = info->var.xres * (info->var.bits_per_pixel >> 3);
+
+        writel(info->fix.line_length >> 3, par->dc_regs + DC_GRAPHICS_PITCH);
+        writel((size + 7) >> 3, par->dc_regs + DC_LINE_SIZE);
+
+        /* Set default watermark values */
+
+        rdmsrl(MSR_LX_DC_SPARE, msrval);
+
+        msrval &= ~(DC_SPARE_DISABLE_CFIFO_HGO | DC_SPARE_VFIFO_ARB_SELECT |
+                    DC_SPARE_LOAD_WM_LPEN_MASK | DC_SPARE_WM_LPEN_OVRD |
+                    DC_SPARE_DISABLE_INIT_VID_PRI | DC_SPARE_DISABLE_VFIFO_WM);
+        msrval |= DC_SPARE_DISABLE_VFIFO_WM | DC_SPARE_DISABLE_INIT_VID_PRI;
+        wrmsrl(MSR_LX_DC_SPARE, msrval);
+
+        gcfg = DC_GCFG_DFLE;   /* Display fifo enable */
+        gcfg |= 0xB600;         /* Set default priority */
+        gcfg |= DC_GCFG_FDTY;  /* Set the frame dirty mode */
+
+        dcfg  = DC_DCFG_VDEN;  /* Enable video data */
+        dcfg |= DC_DCFG_GDEN;  /* Enable graphics */
+        dcfg |= DC_DCFG_TGEN;  /* Turn on the timing generator */
+        dcfg |= DC_DCFG_TRUP;  /* Update timings immediately */
+        dcfg |= DC_DCFG_PALB;  /* Palette bypass in > 8 bpp modes */
+        dcfg |= DC_DCFG_VISL;
+        dcfg |= DC_DCFG_DCEN;  /* Always center the display */
+
+        /* Set the current BPP mode */
+
+        switch (info->var.bits_per_pixel) {
+        case 8:
+                dcfg |= DC_DCFG_DISP_MODE_8BPP;
+                break;
+
+        case 16:
+                dcfg |= DC_DCFG_DISP_MODE_16BPP | DC_DCFG_16BPP;
+                break;
+
+        case 32:
+        case 24:
+                dcfg |= DC_DCFG_DISP_MODE_24BPP;
+                break;
+        }
+
+        /* Now - set up the 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;
+
+        writel((hactive - 1) | ((htotal - 1) << 16),
+               par->dc_regs + DC_H_ACTIVE_TIMING);
+        writel((hblankstart - 1) | ((hblankend - 1) << 16),
+               par->dc_regs + DC_H_BLANK_TIMING);
+        writel((hsyncstart - 1) | ((hsyncend - 1) << 16),
+               par->dc_regs + DC_H_SYNC_TIMING);
+
+        writel((vactive - 1) | ((vtotal - 1) << 16),
+               par->dc_regs + DC_V_ACTIVE_TIMING);
+
+        writel((vblankstart - 1) | ((vblankend - 1) << 16),
+               par->dc_regs + DC_V_BLANK_TIMING);
+
+        writel((vsyncstart - 1)  | ((vsyncend - 1) << 16),
+               par->dc_regs + DC_V_SYNC_TIMING);
+
+        writel( (info->var.xres - 1) << 16 | (info->var.yres - 1),
+                par->dc_regs + DC_FB_ACTIVE);
+
+        /* And re-enable the graphics output */
+        lx_graphics_enable(info);
+
+        /* Write the two main configuration registers */
+        writel(dcfg, par->dc_regs + DC_DISPLAY_CFG);
+        writel(0, par->dc_regs + DC_ARB_CFG);
+        writel(gcfg, par->dc_regs + DC_GENERAL_CFG);
+
+        /* Lock the DC registers */
+        writel(0, par->dc_regs + DC_UNLOCK);
+}
+
+void lx_set_palette_reg(struct fb_info *info, unsigned regno,
+                        unsigned red, unsigned green, unsigned blue)
+{
+        struct lxfb_par *par = info->par;
+        int val;
+
+        /* Hardware palette is in RGB 8-8-8 format. */
+
+        val  = (red   << 8) & 0xff0000;
+        val |= (green)      & 0x00ff00;
+        val |= (blue  >> 8) & 0x0000ff;
+
+        writel(regno, par->dc_regs + DC_PAL_ADDRESS);
+        writel(val, par->dc_regs + DC_PAL_DATA);
+}
+
+int lx_blank_display(struct fb_info *info, int blank_mode)
+{
+        struct lxfb_par *par = info->par;
+        u32 dcfg, fp_pm;
+        int blank, hsync, vsync;
+
+        /* CRT power saving modes. */
+        switch (blank_mode) {
+        case FB_BLANK_UNBLANK:
+                blank = 0; hsync = 1; vsync = 1;
+                break;
+        case FB_BLANK_NORMAL:
+                blank = 1; hsync = 1; vsync = 1;
+                break;
+        case FB_BLANK_VSYNC_SUSPEND:
+                blank = 1; hsync = 1; vsync = 0;
+                break;
+        case FB_BLANK_HSYNC_SUSPEND:
+                blank = 1; hsync = 0; vsync = 1;
+                break;
+        case FB_BLANK_POWERDOWN:
+                blank = 1; hsync = 0; vsync = 0;
+                break;
+        default:
+                return -EINVAL;
+        }
+
+        dcfg = readl(par->df_regs + DF_DISPLAY_CFG);
+        dcfg &= ~(DF_DCFG_DAC_BL_EN
+                  | DF_DCFG_HSYNC_EN | DF_DCFG_VSYNC_EN);
+        if (!blank)
+                dcfg |= DF_DCFG_DAC_BL_EN;
+        if (hsync)
+                dcfg |= DF_DCFG_HSYNC_EN;
+        if (vsync)
+                dcfg |= DF_DCFG_VSYNC_EN;
+        writel(dcfg, par->df_regs + DF_DISPLAY_CFG);
+
+        /* Power on/off flat panel */
+
+        if (par->output & OUTPUT_PANEL) {
+                fp_pm = readl(par->df_regs + DF_FP_PM);
+                if (blank_mode == FB_BLANK_POWERDOWN)
+                        fp_pm &= ~DF_FP_PM_P;
+                else
+                        fp_pm |= DF_FP_PM_P;
+                writel(fp_pm, par->df_regs + DF_FP_PM);
+        }
+
+        return 0;
+}