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// SPDX-License-Identifier: GPL-2.0-only
#include <linux/delay.h>
#include <linux/pci.h>
#include <drm/drm_atomic.h>
#include <drm/drm_drv.h>
#include "mgag200_drv.h"
void mgag200_g200eh_init_registers(struct mga_device *mdev)
{
static const u8 dacvalue[] = {
MGAG200_DAC_DEFAULT(0x00, 0xc9,
MGA1064_MISC_CTL_VGA8 | MGA1064_MISC_CTL_DAC_RAM_CS,
0x00, 0x00, 0x00)
};
size_t i;
for (i = 0; i < ARRAY_SIZE(dacvalue); i++) {
if ((i <= 0x17) ||
(i == 0x1b) ||
(i == 0x1c) ||
((i >= 0x1f) && (i <= 0x29)) ||
((i >= 0x30) && (i <= 0x37)) ||
((i >= 0x44) && (i <= 0x4e)))
continue;
WREG_DAC(i, dacvalue[i]);
}
mgag200_init_registers(mdev);
}
/*
* PIXPLLC
*/
static int mgag200_g200eh_pixpllc_atomic_check(struct drm_crtc *crtc,
struct drm_atomic_state *new_state)
{
static const unsigned int vcomax = 800000;
static const unsigned int vcomin = 400000;
static const unsigned int pllreffreq = 33333;
struct drm_crtc_state *new_crtc_state = drm_atomic_get_new_crtc_state(new_state, crtc);
struct mgag200_crtc_state *new_mgag200_crtc_state = to_mgag200_crtc_state(new_crtc_state);
long clock = new_crtc_state->mode.clock;
struct mgag200_pll_values *pixpllc = &new_mgag200_crtc_state->pixpllc;
unsigned int delta, tmpdelta;
unsigned int testp, testm, testn;
unsigned int p, m, n, s;
unsigned int computed;
m = n = p = s = 0;
delta = 0xffffffff;
for (testp = 16; testp > 0; testp >>= 1) {
if (clock * testp > vcomax)
continue;
if (clock * testp < vcomin)
continue;
for (testm = 1; testm < 33; testm++) {
for (testn = 17; testn < 257; testn++) {
computed = (pllreffreq * testn) / (testm * testp);
if (computed > clock)
tmpdelta = computed - clock;
else
tmpdelta = clock - computed;
if (tmpdelta < delta) {
delta = tmpdelta;
n = testn;
m = testm;
p = testp;
}
}
}
}
pixpllc->m = m;
pixpllc->n = n;
pixpllc->p = p;
pixpllc->s = s;
return 0;
}
void mgag200_g200eh_pixpllc_atomic_update(struct drm_crtc *crtc,
struct drm_atomic_state *old_state)
{
struct drm_device *dev = crtc->dev;
struct mga_device *mdev = to_mga_device(dev);
struct drm_crtc_state *crtc_state = crtc->state;
struct mgag200_crtc_state *mgag200_crtc_state = to_mgag200_crtc_state(crtc_state);
struct mgag200_pll_values *pixpllc = &mgag200_crtc_state->pixpllc;
unsigned int pixpllcm, pixpllcn, pixpllcp, pixpllcs;
u8 xpixpllcm, xpixpllcn, xpixpllcp, tmp;
int i, j, tmpcount, vcount;
bool pll_locked = false;
pixpllcm = pixpllc->m - 1;
pixpllcn = pixpllc->n - 1;
pixpllcp = pixpllc->p - 1;
pixpllcs = pixpllc->s;
xpixpllcm = ((pixpllcn & BIT(8)) >> 1) | pixpllcm;
xpixpllcn = pixpllcn;
xpixpllcp = (pixpllcs << 3) | pixpllcp;
WREG_MISC_MASKED(MGAREG_MISC_CLKSEL_MGA, MGAREG_MISC_CLKSEL_MASK);
for (i = 0; i <= 32 && pll_locked == false; i++) {
WREG8(DAC_INDEX, MGA1064_PIX_CLK_CTL);
tmp = RREG8(DAC_DATA);
tmp |= MGA1064_PIX_CLK_CTL_CLK_DIS;
WREG8(DAC_DATA, tmp);
tmp = RREG8(MGAREG_MEM_MISC_READ);
tmp |= 0x3 << 2;
WREG8(MGAREG_MEM_MISC_WRITE, tmp);
WREG8(DAC_INDEX, MGA1064_PIX_CLK_CTL);
tmp = RREG8(DAC_DATA);
tmp |= MGA1064_PIX_CLK_CTL_CLK_POW_DOWN;
WREG8(DAC_DATA, tmp);
udelay(500);
WREG_DAC(MGA1064_EH_PIX_PLLC_M, xpixpllcm);
WREG_DAC(MGA1064_EH_PIX_PLLC_N, xpixpllcn);
WREG_DAC(MGA1064_EH_PIX_PLLC_P, xpixpllcp);
udelay(500);
WREG8(DAC_INDEX, MGA1064_PIX_CLK_CTL);
tmp = RREG8(DAC_DATA);
tmp &= ~MGA1064_PIX_CLK_CTL_SEL_MSK;
tmp |= MGA1064_PIX_CLK_CTL_SEL_PLL;
WREG8(DAC_DATA, tmp);
WREG8(DAC_INDEX, MGA1064_PIX_CLK_CTL);
tmp = RREG8(DAC_DATA);
tmp &= ~MGA1064_PIX_CLK_CTL_CLK_DIS;
tmp &= ~MGA1064_PIX_CLK_CTL_CLK_POW_DOWN;
WREG8(DAC_DATA, tmp);
vcount = RREG8(MGAREG_VCOUNT);
for (j = 0; j < 30 && pll_locked == false; j++) {
tmpcount = RREG8(MGAREG_VCOUNT);
if (tmpcount < vcount)
vcount = 0;
if ((tmpcount - vcount) > 2)
pll_locked = true;
else
udelay(5);
}
}
}
/*
* DRM device
*/
static const struct mgag200_device_info mgag200_g200eh_device_info =
MGAG200_DEVICE_INFO_INIT(2048, 2048, 37500, false, 1, 0, false);
static const struct mgag200_device_funcs mgag200_g200eh_device_funcs = {
.pixpllc_atomic_check = mgag200_g200eh_pixpllc_atomic_check,
.pixpllc_atomic_update = mgag200_g200eh_pixpllc_atomic_update,
};
struct mga_device *mgag200_g200eh_device_create(struct pci_dev *pdev, const struct drm_driver *drv,
enum mga_type type)
{
struct mga_device *mdev;
struct drm_device *dev;
resource_size_t vram_available;
int ret;
mdev = devm_drm_dev_alloc(&pdev->dev, drv, struct mga_device, base);
if (IS_ERR(mdev))
return mdev;
dev = &mdev->base;
pci_set_drvdata(pdev, dev);
ret = mgag200_init_pci_options(pdev, 0x00000120, 0x0000b000);
if (ret)
return ERR_PTR(ret);
ret = mgag200_device_preinit(mdev);
if (ret)
return ERR_PTR(ret);
ret = mgag200_device_init(mdev, type, &mgag200_g200eh_device_info,
&mgag200_g200eh_device_funcs);
if (ret)
return ERR_PTR(ret);
mgag200_g200eh_init_registers(mdev);
vram_available = mgag200_device_probe_vram(mdev);
ret = mgag200_modeset_init(mdev, vram_available);
if (ret)
return ERR_PTR(ret);
return mdev;
}
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