2014-07-31 00:20:56 +08:00
|
|
|
/*
|
|
|
|
* Copyright (C) STMicroelectronics SA 2014
|
|
|
|
* Authors: Benjamin Gaignard <benjamin.gaignard@st.com>
|
|
|
|
* Fabien Dessenne <fabien.dessenne@st.com>
|
|
|
|
* Vincent Abriou <vincent.abriou@st.com>
|
|
|
|
* for STMicroelectronics.
|
|
|
|
* License terms: GNU General Public License (GPL), version 2
|
|
|
|
*/
|
|
|
|
|
|
|
|
#include <linux/module.h>
|
|
|
|
#include <linux/notifier.h>
|
|
|
|
#include <linux/platform_device.h>
|
|
|
|
|
|
|
|
#include <drm/drmP.h>
|
|
|
|
|
|
|
|
#include "sti_vtg.h"
|
|
|
|
|
|
|
|
#define VTG_TYPE_MASTER 0
|
|
|
|
#define VTG_TYPE_SLAVE_BY_EXT0 1
|
|
|
|
|
|
|
|
/* registers offset */
|
|
|
|
#define VTG_MODE 0x0000
|
|
|
|
#define VTG_CLKLN 0x0008
|
|
|
|
#define VTG_HLFLN 0x000C
|
|
|
|
#define VTG_DRST_AUTOC 0x0010
|
|
|
|
#define VTG_VID_TFO 0x0040
|
|
|
|
#define VTG_VID_TFS 0x0044
|
|
|
|
#define VTG_VID_BFO 0x0048
|
|
|
|
#define VTG_VID_BFS 0x004C
|
|
|
|
|
|
|
|
#define VTG_HOST_ITS 0x0078
|
|
|
|
#define VTG_HOST_ITS_BCLR 0x007C
|
|
|
|
#define VTG_HOST_ITM_BCLR 0x0088
|
|
|
|
#define VTG_HOST_ITM_BSET 0x008C
|
|
|
|
|
|
|
|
#define VTG_H_HD_1 0x00C0
|
|
|
|
#define VTG_TOP_V_VD_1 0x00C4
|
|
|
|
#define VTG_BOT_V_VD_1 0x00C8
|
|
|
|
#define VTG_TOP_V_HD_1 0x00CC
|
|
|
|
#define VTG_BOT_V_HD_1 0x00D0
|
|
|
|
|
|
|
|
#define VTG_H_HD_2 0x00E0
|
|
|
|
#define VTG_TOP_V_VD_2 0x00E4
|
|
|
|
#define VTG_BOT_V_VD_2 0x00E8
|
|
|
|
#define VTG_TOP_V_HD_2 0x00EC
|
|
|
|
#define VTG_BOT_V_HD_2 0x00F0
|
|
|
|
|
|
|
|
#define VTG_H_HD_3 0x0100
|
|
|
|
#define VTG_TOP_V_VD_3 0x0104
|
|
|
|
#define VTG_BOT_V_VD_3 0x0108
|
|
|
|
#define VTG_TOP_V_HD_3 0x010C
|
|
|
|
#define VTG_BOT_V_HD_3 0x0110
|
|
|
|
|
2014-12-05 17:14:11 +08:00
|
|
|
#define VTG_H_HD_4 0x0120
|
|
|
|
#define VTG_TOP_V_VD_4 0x0124
|
|
|
|
#define VTG_BOT_V_VD_4 0x0128
|
|
|
|
#define VTG_TOP_V_HD_4 0x012c
|
|
|
|
#define VTG_BOT_V_HD_4 0x0130
|
|
|
|
|
2014-07-31 00:20:56 +08:00
|
|
|
#define VTG_IRQ_BOTTOM BIT(0)
|
|
|
|
#define VTG_IRQ_TOP BIT(1)
|
|
|
|
#define VTG_IRQ_MASK (VTG_IRQ_TOP | VTG_IRQ_BOTTOM)
|
|
|
|
|
2014-12-05 17:14:11 +08:00
|
|
|
/* Delay introduced by the HDMI in nb of pixel */
|
2015-06-05 17:47:49 +08:00
|
|
|
#define HDMI_DELAY (5)
|
2014-12-05 17:14:11 +08:00
|
|
|
|
2014-07-31 00:20:56 +08:00
|
|
|
/* delay introduced by the Arbitrary Waveform Generator in nb of pixels */
|
|
|
|
#define AWG_DELAY_HD (-9)
|
|
|
|
#define AWG_DELAY_ED (-8)
|
|
|
|
#define AWG_DELAY_SD (-7)
|
|
|
|
|
|
|
|
LIST_HEAD(vtg_lookup);
|
|
|
|
|
|
|
|
/**
|
|
|
|
* STI VTG structure
|
|
|
|
*
|
|
|
|
* @dev: pointer to device driver
|
|
|
|
* @data: data associated to the device
|
|
|
|
* @irq: VTG irq
|
|
|
|
* @type: VTG type (main or aux)
|
|
|
|
* @notifier_list: notifier callback
|
|
|
|
* @crtc_id: the crtc id for vblank event
|
|
|
|
* @slave: slave vtg
|
|
|
|
* @link: List node to link the structure in lookup list
|
|
|
|
*/
|
|
|
|
struct sti_vtg {
|
|
|
|
struct device *dev;
|
|
|
|
struct device_node *np;
|
|
|
|
void __iomem *regs;
|
|
|
|
int irq;
|
|
|
|
u32 irq_status;
|
|
|
|
struct raw_notifier_head notifier_list;
|
|
|
|
int crtc_id;
|
|
|
|
struct sti_vtg *slave;
|
|
|
|
struct list_head link;
|
|
|
|
};
|
|
|
|
|
|
|
|
static void vtg_register(struct sti_vtg *vtg)
|
|
|
|
{
|
|
|
|
list_add_tail(&vtg->link, &vtg_lookup);
|
|
|
|
}
|
|
|
|
|
|
|
|
struct sti_vtg *of_vtg_find(struct device_node *np)
|
|
|
|
{
|
|
|
|
struct sti_vtg *vtg;
|
|
|
|
|
|
|
|
list_for_each_entry(vtg, &vtg_lookup, link) {
|
|
|
|
if (vtg->np == np)
|
|
|
|
return vtg;
|
|
|
|
}
|
|
|
|
return NULL;
|
|
|
|
}
|
|
|
|
EXPORT_SYMBOL(of_vtg_find);
|
|
|
|
|
|
|
|
static void vtg_reset(struct sti_vtg *vtg)
|
|
|
|
{
|
|
|
|
/* reset slave and then master */
|
|
|
|
if (vtg->slave)
|
|
|
|
vtg_reset(vtg->slave);
|
|
|
|
|
|
|
|
writel(1, vtg->regs + VTG_DRST_AUTOC);
|
|
|
|
}
|
|
|
|
|
2015-06-05 17:47:49 +08:00
|
|
|
static void vtg_set_output_window(void __iomem *regs,
|
|
|
|
const struct drm_display_mode *mode)
|
|
|
|
{
|
|
|
|
u32 video_top_field_start;
|
|
|
|
u32 video_top_field_stop;
|
|
|
|
u32 video_bottom_field_start;
|
|
|
|
u32 video_bottom_field_stop;
|
|
|
|
u32 xstart = sti_vtg_get_pixel_number(*mode, 0);
|
|
|
|
u32 ystart = sti_vtg_get_line_number(*mode, 0);
|
|
|
|
u32 xstop = sti_vtg_get_pixel_number(*mode, mode->hdisplay - 1);
|
|
|
|
u32 ystop = sti_vtg_get_line_number(*mode, mode->vdisplay - 1);
|
|
|
|
|
|
|
|
/* Set output window to fit the display mode selected */
|
|
|
|
video_top_field_start = (ystart << 16) | xstart;
|
|
|
|
video_top_field_stop = (ystop << 16) | xstop;
|
|
|
|
|
|
|
|
/* Only progressive supported for now */
|
|
|
|
video_bottom_field_start = video_top_field_start;
|
|
|
|
video_bottom_field_stop = video_top_field_stop;
|
|
|
|
|
|
|
|
writel(video_top_field_start, regs + VTG_VID_TFO);
|
|
|
|
writel(video_top_field_stop, regs + VTG_VID_TFS);
|
|
|
|
writel(video_bottom_field_start, regs + VTG_VID_BFO);
|
|
|
|
writel(video_bottom_field_stop, regs + VTG_VID_BFS);
|
|
|
|
}
|
|
|
|
|
2014-07-31 00:20:56 +08:00
|
|
|
static void vtg_set_mode(struct sti_vtg *vtg,
|
|
|
|
int type, const struct drm_display_mode *mode)
|
|
|
|
{
|
|
|
|
u32 tmp;
|
|
|
|
|
|
|
|
if (vtg->slave)
|
|
|
|
vtg_set_mode(vtg->slave, VTG_TYPE_SLAVE_BY_EXT0, mode);
|
|
|
|
|
2015-06-05 17:47:49 +08:00
|
|
|
/* Set the number of clock cycles per line */
|
2014-07-31 00:20:56 +08:00
|
|
|
writel(mode->htotal, vtg->regs + VTG_CLKLN);
|
|
|
|
|
2015-06-05 17:47:49 +08:00
|
|
|
/* Set Half Line Per Field (only progressive supported for now) */
|
|
|
|
writel(mode->vtotal * 2, vtg->regs + VTG_HLFLN);
|
2014-07-31 00:20:56 +08:00
|
|
|
|
2015-06-05 17:47:49 +08:00
|
|
|
/* Program output window */
|
|
|
|
vtg_set_output_window(vtg->regs, mode);
|
2014-07-31 00:20:56 +08:00
|
|
|
|
2014-12-05 17:14:11 +08:00
|
|
|
/* prepare VTG set 1 for HDMI */
|
|
|
|
tmp = (mode->hsync_end - mode->hsync_start + HDMI_DELAY) << 16;
|
|
|
|
tmp |= HDMI_DELAY;
|
2014-07-31 00:20:56 +08:00
|
|
|
writel(tmp, vtg->regs + VTG_H_HD_1);
|
|
|
|
|
|
|
|
tmp = (mode->vsync_end - mode->vsync_start + 1) << 16;
|
|
|
|
tmp |= 1;
|
|
|
|
writel(tmp, vtg->regs + VTG_TOP_V_VD_1);
|
|
|
|
writel(tmp, vtg->regs + VTG_BOT_V_VD_1);
|
|
|
|
writel(0, vtg->regs + VTG_TOP_V_HD_1);
|
|
|
|
writel(0, vtg->regs + VTG_BOT_V_HD_1);
|
|
|
|
|
|
|
|
/* prepare VTG set 2 for for HD DCS */
|
2014-12-05 17:14:11 +08:00
|
|
|
tmp = (mode->hsync_end - mode->hsync_start) << 16;
|
|
|
|
writel(tmp, vtg->regs + VTG_H_HD_2);
|
|
|
|
|
|
|
|
tmp = (mode->vsync_end - mode->vsync_start + 1) << 16;
|
|
|
|
tmp |= 1;
|
2014-07-31 00:20:56 +08:00
|
|
|
writel(tmp, vtg->regs + VTG_TOP_V_VD_2);
|
|
|
|
writel(tmp, vtg->regs + VTG_BOT_V_VD_2);
|
|
|
|
writel(0, vtg->regs + VTG_TOP_V_HD_2);
|
|
|
|
writel(0, vtg->regs + VTG_BOT_V_HD_2);
|
|
|
|
|
|
|
|
/* prepare VTG set 3 for HD Analog in HD mode */
|
|
|
|
tmp = (mode->hsync_end - mode->hsync_start + AWG_DELAY_HD) << 16;
|
|
|
|
tmp |= mode->htotal + AWG_DELAY_HD;
|
|
|
|
writel(tmp, vtg->regs + VTG_H_HD_3);
|
|
|
|
|
|
|
|
tmp = (mode->vsync_end - mode->vsync_start) << 16;
|
|
|
|
tmp |= mode->vtotal;
|
|
|
|
writel(tmp, vtg->regs + VTG_TOP_V_VD_3);
|
|
|
|
writel(tmp, vtg->regs + VTG_BOT_V_VD_3);
|
|
|
|
|
|
|
|
tmp = (mode->htotal + AWG_DELAY_HD) << 16;
|
|
|
|
tmp |= mode->htotal + AWG_DELAY_HD;
|
|
|
|
writel(tmp, vtg->regs + VTG_TOP_V_HD_3);
|
|
|
|
writel(tmp, vtg->regs + VTG_BOT_V_HD_3);
|
|
|
|
|
2014-12-05 17:14:11 +08:00
|
|
|
/* Prepare VTG set 4 for DVO */
|
|
|
|
tmp = (mode->hsync_end - mode->hsync_start) << 16;
|
|
|
|
writel(tmp, vtg->regs + VTG_H_HD_4);
|
|
|
|
|
|
|
|
tmp = (mode->vsync_end - mode->vsync_start + 1) << 16;
|
|
|
|
tmp |= 1;
|
|
|
|
writel(tmp, vtg->regs + VTG_TOP_V_VD_4);
|
|
|
|
writel(tmp, vtg->regs + VTG_BOT_V_VD_4);
|
|
|
|
writel(0, vtg->regs + VTG_TOP_V_HD_4);
|
|
|
|
writel(0, vtg->regs + VTG_BOT_V_HD_4);
|
|
|
|
|
2014-07-31 00:20:56 +08:00
|
|
|
/* mode */
|
|
|
|
writel(type, vtg->regs + VTG_MODE);
|
|
|
|
}
|
|
|
|
|
|
|
|
static void vtg_enable_irq(struct sti_vtg *vtg)
|
|
|
|
{
|
|
|
|
/* clear interrupt status and mask */
|
|
|
|
writel(0xFFFF, vtg->regs + VTG_HOST_ITS_BCLR);
|
|
|
|
writel(0xFFFF, vtg->regs + VTG_HOST_ITM_BCLR);
|
|
|
|
writel(VTG_IRQ_MASK, vtg->regs + VTG_HOST_ITM_BSET);
|
|
|
|
}
|
|
|
|
|
|
|
|
void sti_vtg_set_config(struct sti_vtg *vtg,
|
|
|
|
const struct drm_display_mode *mode)
|
|
|
|
{
|
|
|
|
/* write configuration */
|
|
|
|
vtg_set_mode(vtg, VTG_TYPE_MASTER, mode);
|
|
|
|
|
|
|
|
vtg_reset(vtg);
|
|
|
|
|
|
|
|
/* enable irq for the vtg vblank synchro */
|
|
|
|
if (vtg->slave)
|
|
|
|
vtg_enable_irq(vtg->slave);
|
|
|
|
else
|
|
|
|
vtg_enable_irq(vtg);
|
|
|
|
}
|
|
|
|
EXPORT_SYMBOL(sti_vtg_set_config);
|
|
|
|
|
|
|
|
/**
|
|
|
|
* sti_vtg_get_line_number
|
|
|
|
*
|
|
|
|
* @mode: display mode to be used
|
|
|
|
* @y: line
|
|
|
|
*
|
|
|
|
* Return the line number according to the display mode taking
|
|
|
|
* into account the Sync and Back Porch information.
|
|
|
|
* Video frame line numbers start at 1, y starts at 0.
|
|
|
|
* In interlaced modes the start line is the field line number of the odd
|
|
|
|
* field, but y is still defined as a progressive frame.
|
|
|
|
*/
|
|
|
|
u32 sti_vtg_get_line_number(struct drm_display_mode mode, int y)
|
|
|
|
{
|
|
|
|
u32 start_line = mode.vtotal - mode.vsync_start + 1;
|
|
|
|
|
|
|
|
if (mode.flags & DRM_MODE_FLAG_INTERLACE)
|
|
|
|
start_line *= 2;
|
|
|
|
|
|
|
|
return start_line + y;
|
|
|
|
}
|
|
|
|
EXPORT_SYMBOL(sti_vtg_get_line_number);
|
|
|
|
|
|
|
|
/**
|
|
|
|
* sti_vtg_get_pixel_number
|
|
|
|
*
|
|
|
|
* @mode: display mode to be used
|
|
|
|
* @x: row
|
|
|
|
*
|
|
|
|
* Return the pixel number according to the display mode taking
|
|
|
|
* into account the Sync and Back Porch information.
|
|
|
|
* Pixels are counted from 0.
|
|
|
|
*/
|
|
|
|
u32 sti_vtg_get_pixel_number(struct drm_display_mode mode, int x)
|
|
|
|
{
|
|
|
|
return mode.htotal - mode.hsync_start + x;
|
|
|
|
}
|
|
|
|
EXPORT_SYMBOL(sti_vtg_get_pixel_number);
|
|
|
|
|
|
|
|
int sti_vtg_register_client(struct sti_vtg *vtg,
|
|
|
|
struct notifier_block *nb, int crtc_id)
|
|
|
|
{
|
|
|
|
if (vtg->slave)
|
|
|
|
return sti_vtg_register_client(vtg->slave, nb, crtc_id);
|
|
|
|
|
|
|
|
vtg->crtc_id = crtc_id;
|
|
|
|
return raw_notifier_chain_register(&vtg->notifier_list, nb);
|
|
|
|
}
|
|
|
|
EXPORT_SYMBOL(sti_vtg_register_client);
|
|
|
|
|
|
|
|
int sti_vtg_unregister_client(struct sti_vtg *vtg, struct notifier_block *nb)
|
|
|
|
{
|
|
|
|
if (vtg->slave)
|
|
|
|
return sti_vtg_unregister_client(vtg->slave, nb);
|
|
|
|
|
|
|
|
return raw_notifier_chain_unregister(&vtg->notifier_list, nb);
|
|
|
|
}
|
|
|
|
EXPORT_SYMBOL(sti_vtg_unregister_client);
|
|
|
|
|
|
|
|
static irqreturn_t vtg_irq_thread(int irq, void *arg)
|
|
|
|
{
|
|
|
|
struct sti_vtg *vtg = arg;
|
|
|
|
u32 event;
|
|
|
|
|
|
|
|
event = (vtg->irq_status & VTG_IRQ_TOP) ?
|
|
|
|
VTG_TOP_FIELD_EVENT : VTG_BOTTOM_FIELD_EVENT;
|
|
|
|
|
|
|
|
raw_notifier_call_chain(&vtg->notifier_list, event, &vtg->crtc_id);
|
|
|
|
|
|
|
|
return IRQ_HANDLED;
|
|
|
|
}
|
|
|
|
|
|
|
|
static irqreturn_t vtg_irq(int irq, void *arg)
|
|
|
|
{
|
|
|
|
struct sti_vtg *vtg = arg;
|
|
|
|
|
|
|
|
vtg->irq_status = readl(vtg->regs + VTG_HOST_ITS);
|
|
|
|
|
|
|
|
writel(vtg->irq_status, vtg->regs + VTG_HOST_ITS_BCLR);
|
|
|
|
|
|
|
|
/* force sync bus write */
|
|
|
|
readl(vtg->regs + VTG_HOST_ITS);
|
|
|
|
|
|
|
|
return IRQ_WAKE_THREAD;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int vtg_probe(struct platform_device *pdev)
|
|
|
|
{
|
|
|
|
struct device *dev = &pdev->dev;
|
|
|
|
struct device_node *np;
|
|
|
|
struct sti_vtg *vtg;
|
|
|
|
struct resource *res;
|
|
|
|
char irq_name[32];
|
|
|
|
int ret;
|
|
|
|
|
|
|
|
vtg = devm_kzalloc(dev, sizeof(*vtg), GFP_KERNEL);
|
|
|
|
if (!vtg)
|
|
|
|
return -ENOMEM;
|
|
|
|
|
|
|
|
vtg->dev = dev;
|
|
|
|
vtg->np = pdev->dev.of_node;
|
|
|
|
|
|
|
|
/* Get Memory ressources */
|
|
|
|
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
|
|
|
|
if (!res) {
|
|
|
|
DRM_ERROR("Get memory resource failed\n");
|
|
|
|
return -ENOMEM;
|
|
|
|
}
|
|
|
|
vtg->regs = devm_ioremap_nocache(dev, res->start, resource_size(res));
|
|
|
|
|
|
|
|
np = of_parse_phandle(pdev->dev.of_node, "st,slave", 0);
|
|
|
|
if (np) {
|
|
|
|
vtg->slave = of_vtg_find(np);
|
|
|
|
|
|
|
|
if (!vtg->slave)
|
|
|
|
return -EPROBE_DEFER;
|
|
|
|
} else {
|
|
|
|
vtg->irq = platform_get_irq(pdev, 0);
|
|
|
|
if (IS_ERR_VALUE(vtg->irq)) {
|
|
|
|
DRM_ERROR("Failed to get VTG interrupt\n");
|
|
|
|
return vtg->irq;
|
|
|
|
}
|
|
|
|
|
|
|
|
snprintf(irq_name, sizeof(irq_name), "vsync-%s",
|
|
|
|
dev_name(vtg->dev));
|
|
|
|
|
|
|
|
RAW_INIT_NOTIFIER_HEAD(&vtg->notifier_list);
|
|
|
|
|
|
|
|
ret = devm_request_threaded_irq(dev, vtg->irq, vtg_irq,
|
|
|
|
vtg_irq_thread, IRQF_ONESHOT, irq_name, vtg);
|
|
|
|
if (IS_ERR_VALUE(ret)) {
|
|
|
|
DRM_ERROR("Failed to register VTG interrupt\n");
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
vtg_register(vtg);
|
|
|
|
platform_set_drvdata(pdev, vtg);
|
|
|
|
|
|
|
|
DRM_INFO("%s %s\n", __func__, dev_name(vtg->dev));
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int vtg_remove(struct platform_device *pdev)
|
|
|
|
{
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static const struct of_device_id vtg_of_match[] = {
|
|
|
|
{ .compatible = "st,vtg", },
|
|
|
|
{ /* sentinel */ }
|
|
|
|
};
|
|
|
|
MODULE_DEVICE_TABLE(of, vtg_of_match);
|
|
|
|
|
|
|
|
struct platform_driver sti_vtg_driver = {
|
|
|
|
.driver = {
|
|
|
|
.name = "sti-vtg",
|
|
|
|
.owner = THIS_MODULE,
|
|
|
|
.of_match_table = vtg_of_match,
|
|
|
|
},
|
|
|
|
.probe = vtg_probe,
|
|
|
|
.remove = vtg_remove,
|
|
|
|
};
|
|
|
|
|
|
|
|
module_platform_driver(sti_vtg_driver);
|
|
|
|
|
|
|
|
MODULE_AUTHOR("Benjamin Gaignard <benjamin.gaignard@st.com>");
|
|
|
|
MODULE_DESCRIPTION("STMicroelectronics SoC DRM driver");
|
|
|
|
MODULE_LICENSE("GPL");
|