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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Copyright (C) 2007 Advanced Micro Devices, Inc.
* Copyright (C) 2008 Andres Salomon <dilinger@debian.org>
*/
#include <linux/fb.h>
#include <asm/io.h>
#include <asm/msr.h>
#include <linux/cs5535.h>
#include <asm/delay.h>
#include "gxfb.h"
#ifdef CONFIG_PM
static void gx_save_regs(struct gxfb_par *par)
{
int i;
/* wait for the BLT engine to stop being busy */
do {
i = read_gp(par, GP_BLT_STATUS);
} while (i & (GP_BLT_STATUS_BLT_PENDING | GP_BLT_STATUS_BLT_BUSY));
/* save MSRs */
rdmsrl(MSR_GX_MSR_PADSEL, par->msr.padsel);
rdmsrl(MSR_GLCP_DOTPLL, par->msr.dotpll);
write_dc(par, DC_UNLOCK, DC_UNLOCK_UNLOCK);
/* save registers */
memcpy(par->gp, par->gp_regs, sizeof(par->gp));
memcpy(par->dc, par->dc_regs, sizeof(par->dc));
memcpy(par->vp, par->vid_regs, sizeof(par->vp));
memcpy(par->fp, par->vid_regs + VP_FP_START, sizeof(par->fp));
/* save the palette */
write_dc(par, DC_PAL_ADDRESS, 0);
for (i = 0; i < ARRAY_SIZE(par->pal); i++)
par->pal[i] = read_dc(par, DC_PAL_DATA);
}
static void gx_set_dotpll(uint32_t dotpll_hi)
{
uint32_t dotpll_lo;
int i;
rdmsrl(MSR_GLCP_DOTPLL, dotpll_lo);
dotpll_lo |= MSR_GLCP_DOTPLL_DOTRESET;
dotpll_lo &= ~MSR_GLCP_DOTPLL_BYPASS;
wrmsr(MSR_GLCP_DOTPLL, dotpll_lo, dotpll_hi);
/* wait for the PLL to lock */
for (i = 0; i < 200; i++) {
rdmsrl(MSR_GLCP_DOTPLL, dotpll_lo);
if (dotpll_lo & MSR_GLCP_DOTPLL_LOCK)
break;
udelay(1);
}
/* PLL set, unlock */
dotpll_lo &= ~MSR_GLCP_DOTPLL_DOTRESET;
wrmsr(MSR_GLCP_DOTPLL, dotpll_lo, dotpll_hi);
}
static void gx_restore_gfx_proc(struct gxfb_par *par)
{
int i;
for (i = 0; i < ARRAY_SIZE(par->gp); i++) {
switch (i) {
case GP_VECTOR_MODE:
case GP_BLT_MODE:
case GP_BLT_STATUS:
case GP_HST_SRC:
/* don't restore these registers */
break;
default:
write_gp(par, i, par->gp[i]);
}
}
}
static void gx_restore_display_ctlr(struct gxfb_par *par)
{
int i;
for (i = 0; i < ARRAY_SIZE(par->dc); i++) {
switch (i) {
case DC_UNLOCK:
/* unlock the DC; runs first */
write_dc(par, DC_UNLOCK, DC_UNLOCK_UNLOCK);
break;
case DC_GENERAL_CFG:
/* write without the enables */
write_dc(par, i, par->dc[i] & ~(DC_GENERAL_CFG_VIDE |
DC_GENERAL_CFG_ICNE |
DC_GENERAL_CFG_CURE |
DC_GENERAL_CFG_DFLE));
break;
case DC_DISPLAY_CFG:
/* write without the enables */
write_dc(par, i, par->dc[i] & ~(DC_DISPLAY_CFG_VDEN |
DC_DISPLAY_CFG_GDEN |
DC_DISPLAY_CFG_TGEN));
break;
case DC_RSVD_0:
case DC_RSVD_1:
case DC_RSVD_2:
case DC_RSVD_3:
case DC_RSVD_4:
case DC_LINE_CNT:
case DC_PAL_ADDRESS:
case DC_PAL_DATA:
case DC_DFIFO_DIAG:
case DC_CFIFO_DIAG:
case DC_RSVD_5:
/* don't restore these registers */
break;
default:
write_dc(par, i, par->dc[i]);
}
}
/* restore the palette */
write_dc(par, DC_PAL_ADDRESS, 0);
for (i = 0; i < ARRAY_SIZE(par->pal); i++)
write_dc(par, DC_PAL_DATA, par->pal[i]);
}
static void gx_restore_video_proc(struct gxfb_par *par)
{
int i;
wrmsrl(MSR_GX_MSR_PADSEL, par->msr.padsel);
for (i = 0; i < ARRAY_SIZE(par->vp); i++) {
switch (i) {
case VP_VCFG:
/* don't enable video yet */
write_vp(par, i, par->vp[i] & ~VP_VCFG_VID_EN);
break;
case VP_DCFG:
/* don't enable CRT yet */
write_vp(par, i, par->vp[i] &
~(VP_DCFG_DAC_BL_EN | VP_DCFG_VSYNC_EN |
VP_DCFG_HSYNC_EN | VP_DCFG_CRT_EN));
break;
case VP_GAR:
case VP_GDR:
case VP_RSVD_0:
case VP_RSVD_1:
case VP_RSVD_2:
case VP_RSVD_3:
case VP_CRC32:
case VP_AWT:
case VP_VTM:
/* don't restore these registers */
break;
default:
write_vp(par, i, par->vp[i]);
}
}
}
static void gx_restore_regs(struct gxfb_par *par)
{
int i;
gx_set_dotpll((uint32_t) (par->msr.dotpll >> 32));
gx_restore_gfx_proc(par);
gx_restore_display_ctlr(par);
gx_restore_video_proc(par);
/* Flat Panel */
for (i = 0; i < ARRAY_SIZE(par->fp); i++) {
if (i != FP_PM && i != FP_RSVD_0)
write_fp(par, i, par->fp[i]);
}
}
static void gx_disable_graphics(struct gxfb_par *par)
{
/* shut down the engine */
write_vp(par, VP_VCFG, par->vp[VP_VCFG] & ~VP_VCFG_VID_EN);
write_vp(par, VP_DCFG, par->vp[VP_DCFG] & ~(VP_DCFG_DAC_BL_EN |
VP_DCFG_VSYNC_EN | VP_DCFG_HSYNC_EN | VP_DCFG_CRT_EN));
/* turn off the flat panel */
write_fp(par, FP_PM, par->fp[FP_PM] & ~FP_PM_P);
/* turn off display */
write_dc(par, DC_UNLOCK, DC_UNLOCK_UNLOCK);
write_dc(par, DC_GENERAL_CFG, par->dc[DC_GENERAL_CFG] &
~(DC_GENERAL_CFG_VIDE | DC_GENERAL_CFG_ICNE |
DC_GENERAL_CFG_CURE | DC_GENERAL_CFG_DFLE));
write_dc(par, DC_DISPLAY_CFG, par->dc[DC_DISPLAY_CFG] &
~(DC_DISPLAY_CFG_VDEN | DC_DISPLAY_CFG_GDEN |
DC_DISPLAY_CFG_TGEN));
write_dc(par, DC_UNLOCK, DC_UNLOCK_LOCK);
}
static void gx_enable_graphics(struct gxfb_par *par)
{
uint32_t fp;
fp = read_fp(par, FP_PM);
if (par->fp[FP_PM] & FP_PM_P) {
/* power on the panel if not already power{ed,ing} on */
if (!(fp & (FP_PM_PANEL_ON|FP_PM_PANEL_PWR_UP)))
write_fp(par, FP_PM, par->fp[FP_PM]);
} else {
/* power down the panel if not already power{ed,ing} down */
if (!(fp & (FP_PM_PANEL_OFF|FP_PM_PANEL_PWR_DOWN)))
write_fp(par, FP_PM, par->fp[FP_PM]);
}
/* turn everything on */
write_vp(par, VP_VCFG, par->vp[VP_VCFG]);
write_vp(par, VP_DCFG, par->vp[VP_DCFG]);
write_dc(par, DC_DISPLAY_CFG, par->dc[DC_DISPLAY_CFG]);
/* do this last; it will enable the FIFO load */
write_dc(par, DC_GENERAL_CFG, par->dc[DC_GENERAL_CFG]);
/* lock the door behind us */
write_dc(par, DC_UNLOCK, DC_UNLOCK_LOCK);
}
int gx_powerdown(struct fb_info *info)
{
struct gxfb_par *par = info->par;
if (par->powered_down)
return 0;
gx_save_regs(par);
gx_disable_graphics(par);
par->powered_down = 1;
return 0;
}
int gx_powerup(struct fb_info *info)
{
struct gxfb_par *par = info->par;
if (!par->powered_down)
return 0;
gx_restore_regs(par);
gx_enable_graphics(par);
par->powered_down = 0;
return 0;
}
#endif
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