diff options
Diffstat (limited to 'drivers/video/fbdev/geode/display_gx.c')
| -rw-r--r-- | drivers/video/fbdev/geode/display_gx.c | 180 |
1 files changed, 180 insertions, 0 deletions
diff --git a/drivers/video/fbdev/geode/display_gx.c b/drivers/video/fbdev/geode/display_gx.c new file mode 100644 index 000000000..b5f25dffd --- /dev/null +++ b/drivers/video/fbdev/geode/display_gx.c @@ -0,0 +1,180 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Geode GX display controller. + * + * Copyright (C) 2005 Arcom Control Systems Ltd. + * + * Portions from AMD's original 2.4 driver: + * Copyright (C) 2004 Advanced Micro Devices, Inc. + */ +#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 <linux/cs5535.h> + +#include "gxfb.h" + +unsigned int gx_frame_buffer_size(void) +{ + unsigned int val; + + if (!cs5535_has_vsa2()) { + uint32_t hi, lo; + + /* The number of pages is (PMAX - PMIN)+1 */ + rdmsr(MSR_GLIU_P2D_RO0, lo, hi); + + /* PMAX */ + val = ((hi & 0xff) << 12) | ((lo & 0xfff00000) >> 20); + /* PMIN */ + val -= (lo & 0x000fffff); + val += 1; + + /* The page size is 4k */ + return (val << 12); + } + + /* FB size can be obtained from the VSA II */ + /* Virtual register class = 0x02 */ + /* VG_MEM_SIZE(512Kb units) = 0x00 */ + + outw(VSA_VR_UNLOCK, VSA_VRC_INDEX); + outw(VSA_VR_MEM_SIZE, VSA_VRC_INDEX); + + val = (unsigned int)(inw(VSA_VRC_DATA)) & 0xFFl; + return (val << 19); +} + +int gx_line_delta(int xres, int bpp) +{ + /* Must be a multiple of 8 bytes. */ + return (xres * (bpp >> 3) + 7) & ~0x7; +} + +void gx_set_mode(struct fb_info *info) +{ + struct gxfb_par *par = info->par; + u32 gcfg, dcfg; + int hactive, hblankstart, hsyncstart, hsyncend, hblankend, htotal; + int vactive, vblankstart, vsyncstart, vsyncend, vblankend, vtotal; + + /* Unlock the display controller registers. */ + write_dc(par, DC_UNLOCK, DC_UNLOCK_UNLOCK); + + gcfg = read_dc(par, DC_GENERAL_CFG); + dcfg = read_dc(par, DC_DISPLAY_CFG); + + /* Disable the timing generator. */ + dcfg &= ~DC_DISPLAY_CFG_TGEN; + write_dc(par, DC_DISPLAY_CFG, dcfg); + + /* Wait for pending memory requests before disabling the FIFO load. */ + udelay(100); + + /* Disable FIFO load and compression. */ + gcfg &= ~(DC_GENERAL_CFG_DFLE | DC_GENERAL_CFG_CMPE | + DC_GENERAL_CFG_DECE); + write_dc(par, DC_GENERAL_CFG, gcfg); + + /* Setup DCLK and its divisor. */ + gx_set_dclk_frequency(info); + + /* + * Setup new mode. + */ + + /* Clear all unused feature bits. */ + gcfg &= DC_GENERAL_CFG_YUVM | DC_GENERAL_CFG_VDSE; + dcfg = 0; + + /* Set FIFO priority (default 6/5) and enable. */ + /* FIXME: increase fifo priority for 1280x1024 and higher modes? */ + gcfg |= (6 << DC_GENERAL_CFG_DFHPEL_SHIFT) | + (5 << DC_GENERAL_CFG_DFHPSL_SHIFT) | DC_GENERAL_CFG_DFLE; + + /* Framebuffer start offset. */ + write_dc(par, DC_FB_ST_OFFSET, 0); + + /* Line delta and line buffer length. */ + write_dc(par, DC_GFX_PITCH, info->fix.line_length >> 3); + write_dc(par, DC_LINE_SIZE, + ((info->var.xres * info->var.bits_per_pixel/8) >> 3) + 2); + + + /* Enable graphics and video data and unmask address lines. */ + dcfg |= DC_DISPLAY_CFG_GDEN | DC_DISPLAY_CFG_VDEN | + DC_DISPLAY_CFG_A20M | DC_DISPLAY_CFG_A18M; + + /* Set pixel format. */ + switch (info->var.bits_per_pixel) { + case 8: + dcfg |= DC_DISPLAY_CFG_DISP_MODE_8BPP; + break; + case 16: + dcfg |= DC_DISPLAY_CFG_DISP_MODE_16BPP; + break; + case 32: + dcfg |= DC_DISPLAY_CFG_DISP_MODE_24BPP; + dcfg |= DC_DISPLAY_CFG_PALB; + break; + } + + /* Enable timing generator. */ + dcfg |= DC_DISPLAY_CFG_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; + + write_dc(par, DC_H_ACTIVE_TIMING, (hactive - 1) | + ((htotal - 1) << 16)); + write_dc(par, DC_H_BLANK_TIMING, (hblankstart - 1) | + ((hblankend - 1) << 16)); + write_dc(par, DC_H_SYNC_TIMING, (hsyncstart - 1) | + ((hsyncend - 1) << 16)); + + write_dc(par, DC_V_ACTIVE_TIMING, (vactive - 1) | + ((vtotal - 1) << 16)); + write_dc(par, DC_V_BLANK_TIMING, (vblankstart - 1) | + ((vblankend - 1) << 16)); + write_dc(par, DC_V_SYNC_TIMING, (vsyncstart - 1) | + ((vsyncend - 1) << 16)); + + /* Write final register values. */ + write_dc(par, DC_DISPLAY_CFG, dcfg); + write_dc(par, DC_GENERAL_CFG, gcfg); + + gx_configure_display(info); + + /* Relock display controller registers */ + write_dc(par, DC_UNLOCK, DC_UNLOCK_LOCK); +} + +void gx_set_hw_palette_reg(struct fb_info *info, unsigned regno, + unsigned red, unsigned green, unsigned blue) +{ + struct gxfb_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; + + write_dc(par, DC_PAL_ADDRESS, regno); + write_dc(par, DC_PAL_DATA, val); +} |