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linux/drivers/gpu/drm/sti/sti_vtg.c
Benjamin Gaignard f2cb314864 drm: sti: add VTG driver 
Video Time Generator drivers are used to synchronize the compositor
and tvout hardware IPs by providing line count, sample count,
synchronization signals (HSYNC, VSYNC) and top and bottom fields
indication.
VTG are used by pair for each data path (main or auxiliary)
one for master and one for slave.

Signed-off-by: Benjamin Gaignard <benjamin.gaignard@linaro.org>
Reviewed-by: Rob Clark <robdclark@gmail.com>
2014-07-30 18:20:56 +02:00

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/*
* 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
#define VTG_IRQ_BOTTOM BIT(0)
#define VTG_IRQ_TOP BIT(1)
#define VTG_IRQ_MASK (VTG_IRQ_TOP | VTG_IRQ_BOTTOM)
/* 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);
}
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);
writel(mode->htotal, vtg->regs + VTG_CLKLN);
writel(mode->vtotal * 2, vtg->regs + VTG_HLFLN);
tmp = (mode->vtotal - mode->vsync_start + 1) << 16;
tmp |= mode->htotal - mode->hsync_start;
writel(tmp, vtg->regs + VTG_VID_TFO);
writel(tmp, vtg->regs + VTG_VID_BFO);
tmp = (mode->vdisplay + mode->vtotal - mode->vsync_start + 1) << 16;
tmp |= mode->hdisplay + mode->htotal - mode->hsync_start;
writel(tmp, vtg->regs + VTG_VID_TFS);
writel(tmp, vtg->regs + VTG_VID_BFS);
/* prepare VTG set 1 and 2 for HDMI and VTG set 3 for HD DAC */
tmp = (mode->hsync_end - mode->hsync_start) << 16;
writel(tmp, vtg->regs + VTG_H_HD_1);
writel(tmp, vtg->regs + VTG_H_HD_2);
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 */
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);
/* 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");
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