/**************************************************************************
* Copyright (c) 2011, Intel Corporation.
* All Rights Reserved.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*
* This program is distributed in the hope it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License along with
* this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
*
**************************************************************************/
#include <linux/backlight.h>
#include <drm/drmP.h>
#include <drm/drm.h>
#include "gma_drm.h"
#include "psb_drv.h"
#include "psb_reg.h"
#include "psb_intel_reg.h"
#include "intel_bios.h"
static int psb_output_init(struct drm_device *dev)
{
struct drm_psb_private *dev_priv = dev->dev_private;
psb_intel_lvds_init(dev, &dev_priv->mode_dev);
psb_intel_sdvo_init(dev, SDVOB);
return 0;
}
#ifdef CONFIG_BACKLIGHT_CLASS_DEVICE
/*
* Poulsbo Backlight Interfaces
*/
#define BLC_PWM_PRECISION_FACTOR 100 /* 10000000 */
#define BLC_PWM_FREQ_CALC_CONSTANT 32
#define MHz 1000000
#define PSB_BLC_PWM_PRECISION_FACTOR 10
#define PSB_BLC_MAX_PWM_REG_FREQ 0xFFFE
#define PSB_BLC_MIN_PWM_REG_FREQ 0x2
#define PSB_BACKLIGHT_PWM_POLARITY_BIT_CLEAR (0xFFFE)
#define PSB_BACKLIGHT_PWM_CTL_SHIFT (16)
static int psb_brightness;
static struct backlight_device *psb_backlight_device;
static int psb_get_brightness(struct backlight_device *bd)
{
/* return locally cached var instead of HW read (due to DPST etc.) */
/* FIXME: ideally return actual value in case firmware fiddled with
it */
return psb_brightness;
}
static int psb_backlight_setup(struct drm_device *dev)
{
struct drm_psb_private *dev_priv = dev->dev_private;
unsigned long core_clock;
/* u32 bl_max_freq; */
/* unsigned long value; */
u16 bl_max_freq;
uint32_t value;
uint32_t blc_pwm_precision_factor;
/* get bl_max_freq and pol from dev_priv*/
if (!dev_priv->lvds_bl) {
dev_err(dev->dev, "Has no valid LVDS backlight info\n");
return -ENOENT;
}
bl_max_freq = dev_priv->lvds_bl->freq;
blc_pwm_precision_factor = PSB_BLC_PWM_PRECISION_FACTOR;
core_clock = dev_priv->core_freq;
value = (core_clock * MHz) / BLC_PWM_FREQ_CALC_CONSTANT;
value *= blc_pwm_precision_factor;
value /= bl_max_freq;
value /= blc_pwm_precision_factor;
if (value > (unsigned long long)PSB_BLC_MAX_PWM_REG_FREQ ||
value < (unsigned long long)PSB_BLC_MIN_PWM_REG_FREQ)
return -ERANGE;
else {
value &= PSB_BACKLIGHT_PWM_POLARITY_BIT_CLEAR;
REG_WRITE(BLC_PWM_CTL,
(value << PSB_BACKLIGHT_PWM_CTL_SHIFT) | (value));
}
return 0;
}
static int psb_set_brightness(struct backlight_device *bd)
{
struct drm_device *dev = bl_get_data(psb_backlight_device);
int level = bd->props.brightness;
/* Percentage 1-100% being valid */
if (level < 1)
level = 1;
psb_intel_lvds_set_brightness(dev, level);
psb_brightness = level;
return 0;
}
static const struct backlight_ops psb_ops = {
.get_brightness = psb_get_brightness,
.update_status = psb_set_brightness,
};
static int psb_backlight_init(struct drm_device *dev)
{
struct drm_psb_private *dev_priv = dev->dev_private;
int ret;
struct backlight_properties props;
memset(&props, 0, sizeof(struct backlight_properties));
props.max_brightness = 100;
props.type = BACKLIGHT_PLATFORM;
psb_backlight_device = backlight_device_register("psb-bl",
NULL, (void *)dev, &psb_ops, &props);
if (IS_ERR(psb_backlight_device))
return PTR_ERR(psb_backlight_device);
ret = psb_backlight_setup(dev);
if (ret < 0) {
backlight_device_unregister(psb_backlight_device);
psb_backlight_device = NULL;
return ret;
}
psb_backlight_device->props.brightness = 100;
psb_backlight_device->props.max_brightness = 100;
backlight_update_status(psb_backlight_device);
dev_priv->backlight_device = psb_backlight_device;
return 0;
}
#endif
/*
* Provide the Poulsbo specific chip logic and low level methods
* for power management
*/
static void psb_init_pm(struct drm_device *dev)
{
struct drm_psb_private *dev_priv = dev->dev_private;
u32 gating = PSB_RSGX32(PSB_CR_CLKGATECTL);
gating &= ~3; /* Disable 2D clock gating */
gating |= 1;
PSB_WSGX32(gating, PSB_CR_CLKGATECTL);
PSB_RSGX32(PSB_CR_CLKGATECTL);
}
/**
* psb_save_display_registers - save registers lost on suspend
* @dev: our DRM device
*
* Save the state we need in order to be able to restore the interface
* upon resume from suspend
*/
static int psb_save_display_registers(struct drm_device *dev)
{
struct drm_psb_private *dev_priv = dev->dev_private;
struct drm_crtc *crtc;
struct drm_connector *connector;
struct psb_state *regs = &dev_priv->regs.psb;
/* Display arbitration control + watermarks */
regs->saveDSPARB = PSB_RVDC32(DSPARB);
regs->saveDSPFW1 = PSB_RVDC32(DSPFW1);
regs->saveDSPFW2 = PSB_RVDC32(DSPFW2);
regs->saveDSPFW3 = PSB_RVDC32(DSPFW3);
regs->saveDSPFW4 = PSB_RVDC32(DSPFW4);
regs->saveDSPFW5 = PSB_RVDC32(DSPFW5);
regs->saveDSPFW6 = PSB_RVDC32(DSPFW6);
regs->saveCHICKENBIT = PSB_RVDC32(DSPCHICKENBIT);
/* Save crtc and output state */
mutex_lock(&dev->mode_config.mutex);
list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
if (drm_helper_crtc_in_use(crtc))
crtc->funcs->save(crtc);
}
list_for_each_entry(connector, &dev->mode_config.connector_list, head)
connector->funcs->save(connector);
mutex_unlock(&dev->mode_config.mutex);
return 0;
}
/**
* psb_restore_display_registers - restore lost register state
* @dev: our DRM device
*
* Restore register state that was lost during suspend and resume.
*/
static int psb_restore_display_registers(struct drm_device *dev)
{
struct drm_psb_private *dev_priv = dev->dev_private;
struct drm_crtc *crtc;
struct drm_connector *connector;
struct psb_state *regs = &dev_priv->regs.psb;
/* Display arbitration + watermarks */
PSB_WVDC32(regs->saveDSPARB, DSPARB);
PSB_WVDC32(regs->saveDSPFW1, DSPFW1);
PSB_WVDC32(regs->saveDSPFW2, DSPFW2);
PSB_WVDC32(regs->saveDSPFW3, DSPFW3);
PSB_WVDC32(regs->saveDSPFW4, DSPFW4);
PSB_WVDC32(regs->saveDSPFW5, DSPFW5);
PSB_WVDC32(regs->saveDSPFW6, DSPFW6);
PSB_WVDC32(regs->saveCHICKENBIT, DSPCHICKENBIT);
/*make sure VGA plane is off. it initializes to on after reset!*/
PSB_WVDC32(0x80000000, VGACNTRL);
mutex_lock(&dev->mode_config.mutex);
list_for_each_entry(crtc, &dev->mode_config.crtc_list, head)
if (drm_helper_crtc_in_use(crtc))
crtc->funcs->restore(crtc);
list_for_each_entry(connector, &dev->mode_config.connector_list, head)
connector->funcs->restore(connector);
mutex_unlock(&dev->mode_config.mutex);
return 0;
}
static int psb_power_down(struct drm_device *dev)
{
return 0;
}
static int psb_power_up(struct drm_device *dev)
{
return 0;
}
static void psb_get_core_freq(struct drm_device *dev)
{
uint32_t clock;
struct pci_dev *pci_root = pci_get_bus_and_slot(0, 0);
struct drm_psb_private *dev_priv = dev->dev_private;
/*pci_write_config_dword(pci_root, 0xD4, 0x00C32004);*/
/*pci_write_config_dword(pci_root, 0xD0, 0xE0033000);*/
pci_write_config_dword(pci_root, 0xD0, 0xD0050300);
pci_read_config_dword(pci_root, 0xD4, &clock);
pci_dev_put(pci_root);
switch (clock & 0x07) {
case 0:
dev_priv->core_freq = 100;
break;
case 1:
dev_priv->core_freq = 133;
break;
case 2:
dev_priv->core_freq = 150;
break;
case 3:
dev_priv->core_freq = 178;
break;
case 4:
dev_priv->core_freq = 200;
break;
case 5:
case 6:
case 7:
dev_priv->core_freq = 266;
default:
dev_priv->core_freq = 0;
}
}
static int psb_chip_setup(struct drm_device *dev)
{
psb_get_core_freq(dev);
gma_intel_setup_gmbus(dev);
gma_intel_opregion_init(dev);
psb_intel_init_bios(dev);
return 0;
}
static void psb_chip_teardown(struct drm_device *dev)
{
gma_intel_teardown_gmbus(dev);
}
const struct psb_ops psb_chip_ops = {
.name = "Poulsbo",
.accel_2d = 1,
.pipes = 2,
.crtcs = 2,
.sgx_offset = PSB_SGX_OFFSET,
.chip_setup = psb_chip_setup,
.chip_teardown = psb_chip_teardown,
.crtc_helper = &psb_intel_helper_funcs,
.crtc_funcs = &psb_intel_crtc_funcs,
.output_init = psb_output_init,
#ifdef CONFIG_BACKLIGHT_CLASS_DEVICE
.backlight_init = psb_backlight_init,
#endif
.init_pm = psb_init_pm,
.save_regs = psb_save_display_registers,
.restore_regs = psb_restore_display_registers,
.power_down = psb_power_down,
.power_up = psb_power_up,
};
