/*
* Copyright (C) 2015 Free Electrons
* Copyright (C) 2015 NextThing Co
*
* Maxime Ripard <maxime.ripard@free-electrons.com>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of
* the License, or (at your option) any later version.
*/
#include <drm/drmP.h>
#include <drm/drm_atomic_helper.h>
#include <drm/drm_crtc.h>
#include <drm/drm_crtc_helper.h>
#include <drm/drm_encoder.h>
#include <drm/drm_modes.h>
#include <drm/drm_of.h>
#include <uapi/drm/drm_mode.h>
#include <linux/component.h>
#include <linux/ioport.h>
#include <linux/of_address.h>
#include <linux/of_device.h>
#include <linux/of_irq.h>
#include <linux/regmap.h>
#include <linux/reset.h>
#include "sun4i_crtc.h"
#include "sun4i_dotclock.h"
#include "sun4i_drv.h"
#include "sun4i_rgb.h"
#include "sun4i_tcon.h"
#include "sunxi_engine.h"
static void sun4i_tcon_channel_set_status(struct sun4i_tcon *tcon, int channel,
bool enabled)
{
struct clk *clk;
switch (channel) {
case 0:
regmap_update_bits(tcon->regs, SUN4I_TCON0_CTL_REG,
SUN4I_TCON0_CTL_TCON_ENABLE,
enabled ? SUN4I_TCON0_CTL_TCON_ENABLE : 0);
clk = tcon->dclk;
break;
case 1:
WARN_ON(!tcon->quirks->has_channel_1);
regmap_update_bits(tcon->regs, SUN4I_TCON1_CTL_REG,
SUN4I_TCON1_CTL_TCON_ENABLE,
enabled ? SUN4I_TCON1_CTL_TCON_ENABLE : 0);
clk = tcon->sclk1;
break;
default:
DRM_WARN("Unknown channel... doing nothing\n");
return;
}
if (enabled)
clk_prepare_enable(clk);
else
clk_disable_unprepare(clk);
}
void sun4i_tcon_set_status(struct sun4i_tcon *tcon,
const struct drm_encoder *encoder,
bool enabled)
{
int channel;
switch (encoder->encoder_type) {
case DRM_MODE_ENCODER_NONE:
channel = 0;
break;
case DRM_MODE_ENCODER_TMDS:
case DRM_MODE_ENCODER_TVDAC:
channel = 1;
break;
default:
DRM_DEBUG_DRIVER("Unknown encoder type, doing nothing...\n");
return;
}
regmap_update_bits(tcon->regs, SUN4I_TCON_GCTL_REG,
SUN4I_TCON_GCTL_TCON_ENABLE,
enabled ? SUN4I_TCON_GCTL_TCON_ENABLE : 0);
sun4i_tcon_channel_set_status(tcon, channel, enabled);
}
void sun4i_tcon_enable_vblank(struct sun4i_tcon *tcon, bool enable)
{
u32 mask, val = 0;
DRM_DEBUG_DRIVER("%sabling VBLANK interrupt\n", enable ? "En" : "Dis");
mask = SUN4I_TCON_GINT0_VBLANK_ENABLE(0) |
SUN4I_TCON_GINT0_VBLANK_ENABLE(1);
if (enable)
val = mask;
regmap_update_bits(tcon->regs, SUN4I_TCON_GINT0_REG, mask, val);
}
EXPORT_SYMBOL(sun4i_tcon_enable_vblank);
/*
* This function is a helper for TCON output muxing. The TCON output
* muxing control register in earlier SoCs (without the TCON TOP block)
* are located in TCON0. This helper returns a pointer to TCON0's
* sun4i_tcon structure, or NULL if not found.
*/
static struct sun4i_tcon *sun4i_get_tcon0(struct drm_device *drm)
{
struct sun4i_drv *drv = drm->dev_private;
struct sun4i_tcon *tcon;
list_for_each_entry(tcon, &drv->tcon_list, list)
if (tcon->id == 0)
return tcon;
dev_warn(drm->dev,
"TCON0 not found, display output muxing may not work\n");
return NULL;
}
void sun4i_tcon_set_mux(struct sun4i_tcon *tcon, int channel,
const struct drm_encoder *encoder)
{
int ret = -ENOTSUPP;
if (tcon->quirks->set_mux)
ret = tcon->quirks->set_mux(tcon, encoder);
DRM_DEBUG_DRIVER("Muxing encoder %s to CRTC %s: %d\n",
encoder->name, encoder->crtc->name, ret);
}
static int sun4i_tcon_get_clk_delay(const struct drm_display_mode *mode,
int channel)
{
int delay = mode->vtotal - mode->vdisplay;
if (mode->flags & DRM_MODE_FLAG_INTERLACE)
delay /= 2;
if (channel == 1)
delay -= 2;
delay = min(delay, 30);
DRM_DEBUG_DRIVER("TCON %d clock delay %u\n", channel, delay);
return delay;
}
static void sun4i_tcon0_mode_set_common(struct sun4i_tcon *tcon,
const struct drm_display_mode *mode)
{
/* Configure the dot clock */
clk_set_rate(tcon->dclk, mode->crtc_clock * 1000);
/* Set the resolution */
regmap_write(tcon->regs, SUN4I_TCON0_BASIC0_REG,
SUN4I_TCON0_BASIC0_X(mode->crtc_hdisplay) |
SUN4I_TCON0_BASIC0_Y(mode->crtc_vdisplay));
}
static void sun4i_tcon0_mode_set_rgb(struct sun4i_tcon *tcon,
const struct drm_display_mode *mode)
{
unsigned int bp, hsync, vsync;
u8 clk_delay;
u32 val = 0;
sun4i_tcon0_mode_set_common(tcon, mode);
/* Adjust clock delay */
clk_delay = sun4i_tcon_get_clk_delay(mode, 0);
regmap_update_bits(tcon->regs, SUN4I_TCON0_CTL_REG,
SUN4I_TCON0_CTL_CLK_DELAY_MASK,
SUN4I_TCON0_CTL_CLK_DELAY(clk_delay));
/*
* This is called a backporch in the register documentation,
* but it really is the back porch + hsync
*/
bp = mode->crtc_htotal - mode->crtc_hsync_start;
DRM_DEBUG_DRIVER("Setting horizontal total %d, backporch %d\n",
mode->crtc_htotal, bp);
/* Set horizontal display timings */
regmap_write(tcon->regs, SUN4I_TCON0_BASIC1_REG,
SUN4I_TCON0_BASIC1_H_TOTAL(mode->crtc_htotal) |
SUN4I_TCON0_BASIC1_H_BACKPORCH(bp));
/*
* This is called a backporch in the register documentation,
* but it really is the back porch + hsync
*/
bp = mode->crtc_vtotal - mode->crtc_vsync_start;
DRM_DEBUG_DRIVER("Setting vertical total %d, backporch %d\n",
mode->crtc_vtotal, bp);
/* Set vertical display timings */
regmap_write(tcon->regs, SUN4I_TCON0_BASIC2_REG,
SUN4I_TCON0_BASIC2_V_TOTAL(mode->crtc_vtotal * 2) |
SUN4I_TCON0_BASIC2_V_BACKPORCH(bp));
/* Set Hsync and Vsync length */
hsync = mode->crtc_hsync_end - mode->crtc_hsync_start;
vsync = mode->crtc_vsync_end - mode->crtc_vsync_start;
DRM_DEBUG_DRIVER("Setting HSYNC %d, VSYNC %d\n", hsync, vsync);
regmap_write(tcon->regs, SUN4I_TCON0_BASIC3_REG,
SUN4I_TCON0_BASIC3_V_SYNC(vsync) |
SUN4I_TCON0_BASIC3_H_SYNC(hsync));
/* Setup the polarity of the various signals */
if (!(mode->flags & DRM_MODE_FLAG_PHSYNC))
val |= SUN4I_TCON0_IO_POL_HSYNC_POSITIVE;
if (!(mode->flags & DRM_MODE_FLAG_PVSYNC))
val |= SUN4I_TCON0_IO_POL_VSYNC_POSITIVE;
regmap_update_bits(tcon->regs, SUN4I_TCON0_IO_POL_REG,
SUN4I_TCON0_IO_POL_HSYNC_POSITIVE | SUN4I_TCON0_IO_POL_VSYNC_POSITIVE,
val);
/* Map output pins to channel 0 */
regmap_update_bits(tcon->regs, SUN4I_TCON_GCTL_REG,
SUN4I_TCON_GCTL_IOMAP_MASK,
SUN4I_TCON_GCTL_IOMAP_TCON0);
/* Enable the output on the pins */
regmap_write(tcon->regs, SUN4I_TCON0_IO_TRI_REG, 0);
}
static void sun4i_tcon1_mode_set(struct sun4i_tcon *tcon,
const struct drm_display_mode *mode)
{
unsigned int bp, hsync, vsync, vtotal;
u8 clk_delay;
u32 val;
WARN_ON(!tcon->quirks->has_channel_1);
/* Configure the dot clock */
clk_set_rate(tcon->sclk1, mode->crtc_clock * 1000);
/* Adjust clock delay */
clk_delay = sun4i_tcon_get_clk_delay(mode, 1);
regmap_update_bits(tcon->regs, SUN4I_TCON1_CTL_REG,
SUN4I_TCON1_CTL_CLK_DELAY_MASK,
SUN4I_TCON1_CTL_CLK_DELAY(clk_delay));
/* Set interlaced mode */
if (mode->flags & DRM_MODE_FLAG_INTERLACE)
val = SUN4I_TCON1_CTL_INTERLACE_ENABLE;
else
val = 0;
regmap_update_bits(tcon->regs, SUN4I_TCON1_CTL_REG,
SUN4I_TCON1_CTL_INTERLACE_ENABLE,
val);
/* Set the input resolution */
regmap_write(tcon->regs, SUN4I_TCON1_BASIC0_REG,
SUN4I_TCON1_BASIC0_X(mode->crtc_hdisplay) |
SUN4I_TCON1_BASIC0_Y(mode->crtc_vdisplay));
/* Set the upscaling resolution */
regmap_write(tcon->regs, SUN4I_TCON1_BASIC1_REG,
SUN4I_TCON1_BASIC1_X(mode->crtc_hdisplay) |
SUN4I_TCON1_BASIC1_Y(mode->crtc_vdisplay));
/* Set the output resolution */
regmap_write(tcon->regs, SUN4I_TCON1_BASIC2_REG,
SUN4I_TCON1_BASIC2_X(mode->crtc_hdisplay) |
SUN4I_TCON1_BASIC2_Y(mode->crtc_vdisplay));
/* Set horizontal display timings */
bp = mode->crtc_htotal - mode->crtc_hsync_start;
DRM_DEBUG_DRIVER("Setting horizontal total %d, backporch %d\n",
mode->htotal, bp);
regmap_write(tcon->regs, SUN4I_TCON1_BASIC3_REG,
SUN4I_TCON1_BASIC3_H_TOTAL(mode->crtc_htotal) |
SUN4I_TCON1_BASIC3_H_BACKPORCH(bp));
bp = mode->crtc_vtotal - mode->crtc_vsync_start;
DRM_DEBUG_DRIVER("Setting vertical total %d, backporch %d\n",
mode->crtc_vtotal, bp);
/*
* The vertical resolution needs to be doubled in all
* cases. We could use crtc_vtotal and always multiply by two,
* but that leads to a rounding error in interlace when vtotal
* is odd.
*
* This happens with TV's PAL for example, where vtotal will
* be 625, crtc_vtotal 312, and thus crtc_vtotal * 2 will be
* 624, which apparently confuses the hardware.
*
* To work around this, we will always use vtotal, and
* multiply by two only if we're not in interlace.
*/
vtotal = mode->vtotal;
if (!(mode->flags & DRM_MODE_FLAG_INTERLACE))
vtotal = vtotal * 2;
/* Set vertical display timings */
regmap_write(tcon->regs, SUN4I_TCON1_BASIC4_REG,
SUN4I_TCON1_BASIC4_V_TOTAL(vtotal) |
SUN4I_TCON1_BASIC4_V_BACKPORCH(bp));
/* Set Hsync and Vsync length */
hsync = mode->crtc_hsync_end - mode->crtc_hsync_start;
vsync = mode->crtc_vsync_end - mode->crtc_vsync_start;
DRM_DEBUG_DRIVER("Setting HSYNC %d, VSYNC %d\n", hsync, vsync);
regmap_write(tcon->regs, SUN4I_TCON1_BASIC5_REG,
SUN4I_TCON1_BASIC5_V_SYNC(vsync) |
SUN4I_TCON1_BASIC5_H_SYNC(hsync));
/* Map output pins to channel 1 */
regmap_update_bits(tcon->regs, SUN4I_TCON_GCTL_REG,
SUN4I_TCON_GCTL_IOMAP_MASK,
SUN4I_TCON_GCTL_IOMAP_TCON1);
}
void sun4i_tcon_mode_set(struct sun4i_tcon *tcon,
const struct drm_encoder *encoder,
const struct drm_display_mode *mode)
{
switch (encoder->encoder_type) {
case DRM_MODE_ENCODER_NONE:
sun4i_tcon0_mode_set_rgb(tcon, mode);
sun4i_tcon_set_mux(tcon, 0, encoder);
break;
case DRM_MODE_ENCODER_TVDAC:
case DRM_MODE_ENCODER_TMDS:
sun4i_tcon1_mode_set(tcon, mode);
sun4i_tcon_set_mux(tcon, 1, encoder);
break;
default:
DRM_DEBUG_DRIVER("Unknown encoder type, doing nothing...\n");
}
}
EXPORT_SYMBOL(sun4i_tcon_mode_set);
static void sun4i_tcon_finish_page_flip(struct drm_device *dev,
struct sun4i_crtc *scrtc)
{
unsigned long flags;
spin_lock_irqsave(&dev->event_lock, flags);
if (scrtc->event) {
drm_crtc_send_vblank_event(&scrtc->crtc, scrtc->event);
drm_crtc_vblank_put(&scrtc->crtc);
scrtc->event = NULL;
}
spin_unlock_irqrestore(&dev->event_lock, flags);
}
static irqreturn_t sun4i_tcon_handler(int irq, void *private)
{
struct sun4i_tcon *tcon = private;
struct drm_device *drm = tcon->drm;
struct sun4i_crtc *scrtc = tcon->crtc;
unsigned int status;
regmap_read(tcon->regs, SUN4I_TCON_GINT0_REG, &status);
if (!(status & (SUN4I_TCON_GINT0_VBLANK_INT(0) |
SUN4I_TCON_GINT0_VBLANK_INT(1))))
return IRQ_NONE;
drm_crtc_handle_vblank(&scrtc->crtc);
sun4i_tcon_finish_page_flip(drm, scrtc);
/* Acknowledge the interrupt */
regmap_update_bits(tcon->regs, SUN4I_TCON_GINT0_REG,
SUN4I_TCON_GINT0_VBLANK_INT(0) |
SUN4I_TCON_GINT0_VBLANK_INT(1),
0);
return IRQ_HANDLED;
}
static int sun4i_tcon_init_clocks(struct device *dev,
struct sun4i_tcon *tcon)
{
tcon->clk = devm_clk_get(dev, "ahb");
if (IS_ERR(tcon->clk)) {
dev_err(dev, "Couldn't get the TCON bus clock\n");
return PTR_ERR(tcon->clk);
}
clk_prepare_enable(tcon->clk);
tcon->sclk0 = devm_clk_get(dev, "tcon-ch0");
if (IS_ERR(tcon->sclk0)) {
dev_err(dev, "Couldn't get the TCON channel 0 clock\n");
return PTR_ERR(tcon->sclk0);
}
if (tcon->quirks->has_channel_1) {
tcon->sclk1 = devm_clk_get(dev, "tcon-ch1");
if (IS_ERR(tcon->sclk1)) {
dev_err(dev, "Couldn't get the TCON channel 1 clock\n");
return PTR_ERR(tcon->sclk1);
}
}
return 0;
}
static void sun4i_tcon_free_clocks(struct sun4i_tcon *tcon)
{
clk_disable_unprepare(tcon->clk);
}
static int sun4i_tcon_init_irq(struct device *dev,
struct sun4i_tcon *tcon)
{
struct platform_device *pdev = to_platform_device(dev);
int irq, ret;
irq = platform_get_irq(pdev, 0);
if (irq < 0) {
dev_err(dev, "Couldn't retrieve the TCON interrupt\n");
return irq;
}
ret = devm_request_irq(dev, irq, sun4i_tcon_handler, 0,
dev_name(dev), tcon);
if (ret) {
dev_err(dev, "Couldn't request the IRQ\n");
return ret;
}
return 0;
}
static struct regmap_config sun4i_tcon_regmap_config = {
.reg_bits = 32,
.val_bits = 32,
.reg_stride = 4,
.max_register = 0x800,
};
static int sun4i_tcon_init_regmap(struct device *dev,
struct sun4i_tcon *tcon)
{
struct platform_device *pdev = to_platform_device(dev);
struct resource *res;
void __iomem *regs;
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
regs = devm_ioremap_resource(dev, res);
if (IS_ERR(regs))
return PTR_ERR(regs);
tcon->regs = devm_regmap_init_mmio(dev, regs,
&sun4i_tcon_regmap_config);
if (IS_ERR(tcon->regs)) {
dev_err(dev, "Couldn't create the TCON regmap\n");
return PTR_ERR(tcon->regs);
}
/* Make sure the TCON is disabled and all IRQs are off */
regmap_write(tcon->regs, SUN4I_TCON_GCTL_REG, 0);
regmap_write(tcon->regs, SUN4I_TCON_GINT0_REG, 0);
regmap_write(tcon->regs, SUN4I_TCON_GINT1_REG, 0);
/* Disable IO lines and set them to tristate */
regmap_write(tcon->regs, SUN4I_TCON0_IO_TRI_REG, ~0);
regmap_write(tcon->regs, SUN4I_TCON1_IO_TRI_REG, ~0);
return 0;
}
/*
* On SoCs with the old display pipeline design (Display Engine 1.0),
* the TCON is always tied to just one backend. Hence we can traverse
* the of_graph upwards to find the backend our tcon is connected to,
* and take its ID as our own.
*
* We can either identify backends from their compatible strings, which
* means maintaining a large list of them. Or, since the backend is
* registered and binded before the TCON, we can just go through the
* list of registered backends and compare the device node.
*
* As the structures now store engines instead of backends, here this
* function in fact searches the corresponding engine, and the ID is
* requested via the get_id function of the engine.
*/
static struct sunxi_engine *
sun4i_tcon_find_engine_traverse(struct sun4i_drv *drv,
struct device_node *node)
{
struct device_node *port, *ep, *remote;
struct sunxi_engine *engine = ERR_PTR(-EINVAL);
port = of_graph_get_port_by_id(node, 0);
if (!port)
return ERR_PTR(-EINVAL);
/*
* This only works if there is only one path from the TCON
* to any display engine. Otherwise the probe order of the
* TCONs and display engines is not guaranteed. They may
* either bind to the wrong one, or worse, bind to the same
* one if additional checks are not done.
*
* Bail out if there are multiple input connections.
*/
if (of_get_available_child_count(port) != 1)
goto out_put_port;
/* Get the first connection without specifying an ID */
ep = of_get_next_available_child(port, NULL);
if (!ep)
goto out_put_port;
remote = of_graph_get_remote_port_parent(ep);
if (!remote)
goto out_put_ep;
/* does this node match any registered engines? */
list_for_each_entry(engine, &drv->engine_list, list)
if (remote == engine->node)
goto out_put_remote;
/* keep looking through upstream ports */
engine = sun4i_tcon_find_engine_traverse(drv, remote);
out_put_remote:
of_node_put(remote);
out_put_ep:
of_node_put(ep);
out_put_port:
of_node_put(port);
return engine;
}
/*
* The device tree binding says that the remote endpoint ID of any
* connection between components, up to and including the TCON, of
* the display pipeline should be equal to the actual ID of the local
* component. Thus we can look at any one of the input connections of
* the TCONs, and use that connection's remote endpoint ID as our own.
*
* Since the user of this function already finds the input port,
* the port is passed in directly without further checks.
*/
static int sun4i_tcon_of_get_id_from_port(struct device_node *port)
{
struct device_node *ep;
int ret = -EINVAL;
/* try finding an upstream endpoint */
for_each_available_child_of_node(port, ep) {
struct device_node *remote;
u32 reg;
remote = of_graph_get_remote_endpoint(ep);
if (!remote)
continue;
ret = of_property_read_u32(remote, "reg", ®);
if (ret)
continue;
ret = reg;
}
return ret;
}
/*
* Once we know the TCON's id, we can look through the list of
* engines to find a matching one. We assume all engines have
* been probed and added to the list.
*/
static struct sunxi_engine *sun4i_tcon_get_engine_by_id(struct sun4i_drv *drv,
int id)
{
struct sunxi_engine *engine;
list_for_each_entry(engine, &drv->engine_list, list)
if (engine->id == id)
return engine;
return ERR_PTR(-EINVAL);
}
/*
* On SoCs with the old display pipeline design (Display Engine 1.0),
* we assumed the TCON was always tied to just one backend. However
* this proved not to be the case. On the A31, the TCON can select
* either backend as its source. On the A20 (and likely on the A10),
* the backend can choose which TCON to output to.
*
* The device tree binding says that the remote endpoint ID of any
* connection between components, up to and including the TCON, of
* the display pipeline should be equal to the actual ID of the local
* component. Thus we should be able to look at any one of the input
* connections of the TCONs, and use that connection's remote endpoint
* ID as our own.
*
* However the connections between the backend and TCON were assumed
* to be always singular, and their endpoit IDs were all incorrectly
* set to 0. This means for these old device trees, we cannot just look
* up the remote endpoint ID of a TCON input endpoint. TCON1 would be
* incorrectly identified as TCON0.
*
* This function first checks if the TCON node has 2 input endpoints.
* If so, then the device tree is a corrected version, and it will use
* sun4i_tcon_of_get_id() and sun4i_tcon_get_engine_by_id() from above
* to fetch the ID and engine directly. If not, then it is likely an
* old device trees, where the endpoint IDs were incorrect, but did not
* have endpoint connections between the backend and TCON across
* different display pipelines. It will fall back to the old method of
* traversing the of_graph to try and find a matching engine by device
* node.
*
* In the case of single display pipeline device trees, either method
* works.
*/
static struct sunxi_engine *sun4i_tcon_find_engine(struct sun4i_drv *drv,
struct device_node *node)
{
struct device_node *port;
struct sunxi_engine *engine;
port = of_graph_get_port_by_id(node, 0);
if (!port)
return ERR_PTR(-EINVAL);
/*
* Is this a corrected device tree with cross pipeline
* connections between the backend and TCON?
*/
if (of_get_child_count(port) > 1) {
/* Get our ID directly from an upstream endpoint */
int id = sun4i_tcon_of_get_id_from_port(port);
/* Get our engine by matching our ID */
engine = sun4i_tcon_get_engine_by_id(drv, id);
of_node_put(port);
return engine;
}
/* Fallback to old method by traversing input endpoints */
of_node_put(port);
return sun4i_tcon_find_engine_traverse(drv, node);
}
static int sun4i_tcon_bind(struct device *dev, struct device *master,
void *data)
{
struct drm_device *drm = data;
struct sun4i_drv *drv = drm->dev_private;
struct sunxi_engine *engine;
struct sun4i_tcon *tcon;
int ret;
engine = sun4i_tcon_find_engine(drv, dev->of_node);
if (IS_ERR(engine)) {
dev_err(dev, "Couldn't find matching engine\n");
return -EPROBE_DEFER;
}
tcon = devm_kzalloc(dev, sizeof(*tcon), GFP_KERNEL);
if (!tcon)
return -ENOMEM;
dev_set_drvdata(dev, tcon);
tcon->drm = drm;
tcon->dev = dev;
tcon->id = engine->id;
tcon->quirks = of_device_get_match_data(dev);
tcon->lcd_rst = devm_reset_control_get(dev, "lcd");
if (IS_ERR(tcon->lcd_rst)) {
dev_err(dev, "Couldn't get our reset line\n");
return PTR_ERR(tcon->lcd_rst);
}
/* Make sure our TCON is reset */
ret = reset_control_reset(tcon->lcd_rst);
if (ret) {
dev_err(dev, "Couldn't deassert our reset line\n");
return ret;
}
ret = sun4i_tcon_init_clocks(dev, tcon);
if (ret) {
dev_err(dev, "Couldn't init our TCON clocks\n");
goto err_assert_reset;
}
ret = sun4i_tcon_init_regmap(dev, tcon);
if (ret) {
dev_err(dev, "Couldn't init our TCON regmap\n");
goto err_free_clocks;
}
ret = sun4i_dclk_create(dev, tcon);
if (ret) {
dev_err(dev, "Couldn't create our TCON dot clock\n");
goto err_free_clocks;
}
ret = sun4i_tcon_init_irq(dev, tcon);
if (ret) {
dev_err(dev, "Couldn't init our TCON interrupts\n");
goto err_free_dotclock;
}
tcon->crtc = sun4i_crtc_init(drm, engine, tcon);
if (IS_ERR(tcon->crtc)) {
dev_err(dev, "Couldn't create our CRTC\n");
ret = PTR_ERR(tcon->crtc);
goto err_free_clocks;
}
ret = sun4i_rgb_init(drm, tcon);
if (ret < 0)
goto err_free_clocks;
if (tcon->quirks->needs_de_be_mux) {
/*
* We assume there is no dynamic muxing of backends
* and TCONs, so we select the backend with same ID.
*
* While dynamic selection might be interesting, since
* the CRTC is tied to the TCON, while the layers are
* tied to the backends, this means, we will need to
* switch between groups of layers. There might not be
* a way to represent this constraint in DRM.
*/
regmap_update_bits(tcon->regs, SUN4I_TCON0_CTL_REG,
SUN4I_TCON0_CTL_SRC_SEL_MASK,
tcon->id);
regmap_update_bits(tcon->regs, SUN4I_TCON1_CTL_REG,
SUN4I_TCON1_CTL_SRC_SEL_MASK,
tcon->id);
}
list_add_tail(&tcon->list, &drv->tcon_list);
return 0;
err_free_dotclock:
sun4i_dclk_free(tcon);
err_free_clocks:
sun4i_tcon_free_clocks(tcon);
err_assert_reset:
reset_control_assert(tcon->lcd_rst);
return ret;
}
static void sun4i_tcon_unbind(struct device *dev, struct device *master,
void *data)
{
struct sun4i_tcon *tcon = dev_get_drvdata(dev);
list_del(&tcon->list);
sun4i_dclk_free(tcon);
sun4i_tcon_free_clocks(tcon);
}
static const struct component_ops sun4i_tcon_ops = {
.bind = sun4i_tcon_bind,
.unbind = sun4i_tcon_unbind,
};
static int sun4i_tcon_probe(struct platform_device *pdev)
{
struct device_node *node = pdev->dev.of_node;
struct drm_bridge *bridge;
struct drm_panel *panel;
int ret;
ret = drm_of_find_panel_or_bridge(node, 1, 0, &panel, &bridge);
if (ret == -EPROBE_DEFER)
return ret;
return component_add(&pdev->dev, &sun4i_tcon_ops);
}
static int sun4i_tcon_remove(struct platform_device *pdev)
{
component_del(&pdev->dev, &sun4i_tcon_ops);
return 0;
}
/* platform specific TCON muxing callbacks */
static int sun4i_a10_tcon_set_mux(struct sun4i_tcon *tcon,
const struct drm_encoder *encoder)
{
struct sun4i_tcon *tcon0 = sun4i_get_tcon0(encoder->dev);
u32 shift;
if (!tcon0)
return -EINVAL;
switch (encoder->encoder_type) {
case DRM_MODE_ENCODER_TMDS:
/* HDMI */
shift = 8;
break;
default:
return -EINVAL;
}
regmap_update_bits(tcon0->regs, SUN4I_TCON_MUX_CTRL_REG,
0x3 << shift, tcon->id << shift);
return 0;
}
static int sun5i_a13_tcon_set_mux(struct sun4i_tcon *tcon,
const struct drm_encoder *encoder)
{
u32 val;
if (encoder->encoder_type == DRM_MODE_ENCODER_TVDAC)
val = 1;
else
val = 0;
/*
* FIXME: Undocumented bits
*/
return regmap_write(tcon->regs, SUN4I_TCON_MUX_CTRL_REG, val);
}
static int sun6i_tcon_set_mux(struct sun4i_tcon *tcon,
const struct drm_encoder *encoder)
{
struct sun4i_tcon *tcon0 = sun4i_get_tcon0(encoder->dev);
u32 shift;
if (!tcon0)
return -EINVAL;
switch (encoder->encoder_type) {
case DRM_MODE_ENCODER_TMDS:
/* HDMI */
shift = 8;
break;
default:
/* TODO A31 has MIPI DSI but A31s does not */
return -EINVAL;
}
regmap_update_bits(tcon0->regs, SUN4I_TCON_MUX_CTRL_REG,
0x3 << shift, tcon->id << shift);
return 0;
}
static const struct sun4i_tcon_quirks sun4i_a10_quirks = {
.has_channel_1 = true,
.set_mux = sun4i_a10_tcon_set_mux,
};
static const struct sun4i_tcon_quirks sun5i_a13_quirks = {
.has_channel_1 = true,
.set_mux = sun5i_a13_tcon_set_mux,
};
static const struct sun4i_tcon_quirks sun6i_a31_quirks = {
.has_channel_1 = true,
.needs_de_be_mux = true,
.set_mux = sun6i_tcon_set_mux,
};
static const struct sun4i_tcon_quirks sun6i_a31s_quirks = {
.has_channel_1 = true,
.needs_de_be_mux = true,
};
static const struct sun4i_tcon_quirks sun7i_a20_quirks = {
.has_channel_1 = true,
/* Same display pipeline structure as A10 */
.set_mux = sun4i_a10_tcon_set_mux,
};
static const struct sun4i_tcon_quirks sun8i_a33_quirks = {
/* nothing is supported */
};
static const struct sun4i_tcon_quirks sun8i_v3s_quirks = {
/* nothing is supported */
};
static const struct of_device_id sun4i_tcon_of_table[] = {
{ .compatible = "allwinner,sun4i-a10-tcon", .data = &sun4i_a10_quirks },
{ .compatible = "allwinner,sun5i-a13-tcon", .data = &sun5i_a13_quirks },
{ .compatible = "allwinner,sun6i-a31-tcon", .data = &sun6i_a31_quirks },
{ .compatible = "allwinner,sun6i-a31s-tcon", .data = &sun6i_a31s_quirks },
{ .compatible = "allwinner,sun7i-a20-tcon", .data = &sun7i_a20_quirks },
{ .compatible = "allwinner,sun8i-a33-tcon", .data = &sun8i_a33_quirks },
{ .compatible = "allwinner,sun8i-v3s-tcon", .data = &sun8i_v3s_quirks },
{ }
};
MODULE_DEVICE_TABLE(of, sun4i_tcon_of_table);
static struct platform_driver sun4i_tcon_platform_driver = {
.probe = sun4i_tcon_probe,
.remove = sun4i_tcon_remove,
.driver = {
.name = "sun4i-tcon",
.of_match_table = sun4i_tcon_of_table,
},
};
module_platform_driver(sun4i_tcon_platform_driver);
MODULE_AUTHOR("Maxime Ripard <maxime.ripard@free-electrons.com>");
MODULE_DESCRIPTION("Allwinner A10 Timing Controller Driver");
MODULE_LICENSE("GPL");
