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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* drivers/video/geode/video_cs5530.c
* -- CS5530 video device
*
* Copyright (C) 2005 Arcom Control Systems Ltd.
*
* Based on AMD's original 2.4 driver:
* Copyright (C) 2004 Advanced Micro Devices, Inc.
*/
#include <linux/fb.h>
#include <linux/delay.h>
#include <asm/io.h>
#include <asm/delay.h>
#include "geodefb.h"
#include "video_cs5530.h"
/*
* CS5530 PLL table. This maps pixclocks to the appropriate PLL register
* value.
*/
struct cs5530_pll_entry {
long pixclock; /* ps */
u32 pll_value;
};
static const struct cs5530_pll_entry cs5530_pll_table[] = {
{ 39721, 0x31C45801, }, /* 25.1750 MHz */
{ 35308, 0x20E36802, }, /* 28.3220 */
{ 31746, 0x33915801, }, /* 31.5000 */
{ 27777, 0x31EC4801, }, /* 36.0000 */
{ 26666, 0x21E22801, }, /* 37.5000 */
{ 25000, 0x33088801, }, /* 40.0000 */
{ 22271, 0x33E22801, }, /* 44.9000 */
{ 20202, 0x336C4801, }, /* 49.5000 */
{ 20000, 0x23088801, }, /* 50.0000 */
{ 19860, 0x23088801, }, /* 50.3500 */
{ 18518, 0x3708A801, }, /* 54.0000 */
{ 17777, 0x23E36802, }, /* 56.2500 */
{ 17733, 0x23E36802, }, /* 56.3916 */
{ 17653, 0x23E36802, }, /* 56.6444 */
{ 16949, 0x37C45801, }, /* 59.0000 */
{ 15873, 0x23EC4801, }, /* 63.0000 */
{ 15384, 0x37911801, }, /* 65.0000 */
{ 14814, 0x37963803, }, /* 67.5000 */
{ 14124, 0x37058803, }, /* 70.8000 */
{ 13888, 0x3710C805, }, /* 72.0000 */
{ 13333, 0x37E22801, }, /* 75.0000 */
{ 12698, 0x27915801, }, /* 78.7500 */
{ 12500, 0x37D8D802, }, /* 80.0000 */
{ 11135, 0x27588802, }, /* 89.8000 */
{ 10582, 0x27EC4802, }, /* 94.5000 */
{ 10101, 0x27AC6803, }, /* 99.0000 */
{ 10000, 0x27088801, }, /* 100.0000 */
{ 9259, 0x2710C805, }, /* 108.0000 */
{ 8888, 0x27E36802, }, /* 112.5000 */
{ 7692, 0x27C58803, }, /* 130.0000 */
{ 7407, 0x27316803, }, /* 135.0000 */
{ 6349, 0x2F915801, }, /* 157.5000 */
{ 6172, 0x2F08A801, }, /* 162.0000 */
{ 5714, 0x2FB11802, }, /* 175.0000 */
{ 5291, 0x2FEC4802, }, /* 189.0000 */
{ 4950, 0x2F963803, }, /* 202.0000 */
{ 4310, 0x2FB1B802, }, /* 232.0000 */
};
static void cs5530_set_dclk_frequency(struct fb_info *info)
{
struct geodefb_par *par = info->par;
int i;
u32 value;
long min, diff;
/* Search the table for the closest pixclock. */
value = cs5530_pll_table[0].pll_value;
min = cs5530_pll_table[0].pixclock - info->var.pixclock;
if (min < 0) min = -min;
for (i = 1; i < ARRAY_SIZE(cs5530_pll_table); i++) {
diff = cs5530_pll_table[i].pixclock - info->var.pixclock;
if (diff < 0L) diff = -diff;
if (diff < min) {
min = diff;
value = cs5530_pll_table[i].pll_value;
}
}
writel(value, par->vid_regs + CS5530_DOT_CLK_CONFIG);
writel(value | 0x80000100, par->vid_regs + CS5530_DOT_CLK_CONFIG); /* set reset and bypass */
udelay(500); /* wait for PLL to settle */
writel(value & 0x7FFFFFFF, par->vid_regs + CS5530_DOT_CLK_CONFIG); /* clear reset */
writel(value & 0x7FFFFEFF, par->vid_regs + CS5530_DOT_CLK_CONFIG); /* clear bypass */
}
static void cs5530_configure_display(struct fb_info *info)
{
struct geodefb_par *par = info->par;
u32 dcfg;
dcfg = readl(par->vid_regs + CS5530_DISPLAY_CONFIG);
/* Clear bits from existing mode. */
dcfg &= ~(CS5530_DCFG_CRT_SYNC_SKW_MASK | CS5530_DCFG_PWR_SEQ_DLY_MASK
| CS5530_DCFG_CRT_HSYNC_POL | CS5530_DCFG_CRT_VSYNC_POL
| CS5530_DCFG_FP_PWR_EN | CS5530_DCFG_FP_DATA_EN
| CS5530_DCFG_DAC_PWR_EN | CS5530_DCFG_VSYNC_EN
| CS5530_DCFG_HSYNC_EN);
/* Set default sync skew and power sequence delays. */
dcfg |= (CS5530_DCFG_CRT_SYNC_SKW_INIT | CS5530_DCFG_PWR_SEQ_DLY_INIT
| CS5530_DCFG_GV_PAL_BYP);
/* Enable DACs, hsync and vsync for CRTs */
if (par->enable_crt) {
dcfg |= CS5530_DCFG_DAC_PWR_EN;
dcfg |= CS5530_DCFG_HSYNC_EN | CS5530_DCFG_VSYNC_EN;
}
/* Enable panel power and data if using a flat panel. */
if (par->panel_x > 0) {
dcfg |= CS5530_DCFG_FP_PWR_EN;
dcfg |= CS5530_DCFG_FP_DATA_EN;
}
/* Sync polarities. */
if (info->var.sync & FB_SYNC_HOR_HIGH_ACT)
dcfg |= CS5530_DCFG_CRT_HSYNC_POL;
if (info->var.sync & FB_SYNC_VERT_HIGH_ACT)
dcfg |= CS5530_DCFG_CRT_VSYNC_POL;
writel(dcfg, par->vid_regs + CS5530_DISPLAY_CONFIG);
}
static int cs5530_blank_display(struct fb_info *info, int blank_mode)
{
struct geodefb_par *par = info->par;
u32 dcfg;
int blank, hsync, vsync;
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->vid_regs + CS5530_DISPLAY_CONFIG);
dcfg &= ~(CS5530_DCFG_DAC_BL_EN | CS5530_DCFG_DAC_PWR_EN
| CS5530_DCFG_HSYNC_EN | CS5530_DCFG_VSYNC_EN
| CS5530_DCFG_FP_DATA_EN | CS5530_DCFG_FP_PWR_EN);
if (par->enable_crt) {
if (!blank)
dcfg |= CS5530_DCFG_DAC_BL_EN | CS5530_DCFG_DAC_PWR_EN;
if (hsync)
dcfg |= CS5530_DCFG_HSYNC_EN;
if (vsync)
dcfg |= CS5530_DCFG_VSYNC_EN;
}
if (par->panel_x > 0) {
if (!blank)
dcfg |= CS5530_DCFG_FP_DATA_EN;
if (hsync && vsync)
dcfg |= CS5530_DCFG_FP_PWR_EN;
}
writel(dcfg, par->vid_regs + CS5530_DISPLAY_CONFIG);
return 0;
}
const struct geode_vid_ops cs5530_vid_ops = {
.set_dclk = cs5530_set_dclk_frequency,
.configure_display = cs5530_configure_display,
.blank_display = cs5530_blank_display,
};
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