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// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (C) 2018 Linus Walleij <linus.walleij@linaro.org>
* Parts of this file were based on the MCDE driver by Marcus Lorentzon
* (C) ST-Ericsson SA 2013
*/
/**
* DOC: ST-Ericsson MCDE Driver
*
* The MCDE (short for multi-channel display engine) is a graphics
* controller found in the Ux500 chipsets, such as NovaThor U8500.
* It was initially conceptualized by ST Microelectronics for the
* successor of the Nomadik line, STn8500 but productified in the
* ST-Ericsson U8500 where is was used for mass-market deployments
* in Android phones from Samsung and Sony Ericsson.
*
* It can do 1080p30 on SDTV CCIR656, DPI-2, DBI-2 or DSI for
* panels with or without frame buffering and can convert most
* input formats including most variants of RGB and YUV.
*
* The hardware has four display pipes, and the layout is a little
* bit like this::
*
* Memory -> Overlay -> Channel -> FIFO -> 8 formatters -> DSI/DPI
* External 0..5 0..3 A,B, 6 x DSI bridge
* source 0..9 C0,C1 2 x DPI
*
* FIFOs A and B are for LCD and HDMI while FIFO CO/C1 are for
* panels with embedded buffer.
* 6 of the formatters are for DSI, 3 pairs for VID/CMD respectively.
* 2 of the formatters are for DPI.
*
* Behind the formatters are the DSI or DPI ports that route to
* the external pins of the chip. As there are 3 DSI ports and one
* DPI port, it is possible to configure up to 4 display pipelines
* (effectively using channels 0..3) for concurrent use.
*
* In the current DRM/KMS setup, we use one external source, one overlay,
* one FIFO and one formatter which we connect to the simple DMA framebuffer
* helpers. We then provide a bridge to the DSI port, and on the DSI port
* bridge we connect hang a panel bridge or other bridge. This may be subject
* to change as we exploit more of the hardware capabilities.
*
* TODO:
*
* - Enabled damaged rectangles using drm_plane_enable_fb_damage_clips()
* so we can selectively just transmit the damaged area to a
* command-only display.
* - Enable mixing of more planes, possibly at the cost of moving away
* from using the simple framebuffer pipeline.
* - Enable output to bridges such as the AV8100 HDMI encoder from
* the DSI bridge.
*/
#include <linux/clk.h>
#include <linux/component.h>
#include <linux/dma-buf.h>
#include <linux/irq.h>
#include <linux/io.h>
#include <linux/module.h>
#include <linux/of_platform.h>
#include <linux/platform_device.h>
#include <linux/regulator/consumer.h>
#include <linux/slab.h>
#include <linux/delay.h>
#include <drm/drm_atomic_helper.h>
#include <drm/drm_bridge.h>
#include <drm/drm_drv.h>
#include <drm/drm_fb_dma_helper.h>
#include <drm/drm_fbdev_dma.h>
#include <drm/drm_gem.h>
#include <drm/drm_gem_dma_helper.h>
#include <drm/drm_gem_framebuffer_helper.h>
#include <drm/drm_managed.h>
#include <drm/drm_of.h>
#include <drm/drm_probe_helper.h>
#include <drm/drm_panel.h>
#include <drm/drm_vblank.h>
#include "mcde_drm.h"
#define DRIVER_DESC "DRM module for MCDE"
#define MCDE_PID 0x000001FC
#define MCDE_PID_METALFIX_VERSION_SHIFT 0
#define MCDE_PID_METALFIX_VERSION_MASK 0x000000FF
#define MCDE_PID_DEVELOPMENT_VERSION_SHIFT 8
#define MCDE_PID_DEVELOPMENT_VERSION_MASK 0x0000FF00
#define MCDE_PID_MINOR_VERSION_SHIFT 16
#define MCDE_PID_MINOR_VERSION_MASK 0x00FF0000
#define MCDE_PID_MAJOR_VERSION_SHIFT 24
#define MCDE_PID_MAJOR_VERSION_MASK 0xFF000000
static const struct drm_mode_config_funcs mcde_mode_config_funcs = {
.fb_create = drm_gem_fb_create,
.atomic_check = drm_atomic_helper_check,
.atomic_commit = drm_atomic_helper_commit,
};
static const struct drm_mode_config_helper_funcs mcde_mode_config_helpers = {
/*
* Using this function is necessary to commit atomic updates
* that need the CRTC to be enabled before a commit, as is
* the case with e.g. DSI displays.
*/
.atomic_commit_tail = drm_atomic_helper_commit_tail_rpm,
};
static irqreturn_t mcde_irq(int irq, void *data)
{
struct mcde *mcde = data;
u32 val;
val = readl(mcde->regs + MCDE_MISERR);
mcde_display_irq(mcde);
if (val)
dev_info(mcde->dev, "some error IRQ\n");
writel(val, mcde->regs + MCDE_RISERR);
return IRQ_HANDLED;
}
static int mcde_modeset_init(struct drm_device *drm)
{
struct drm_mode_config *mode_config;
struct mcde *mcde = to_mcde(drm);
int ret;
/*
* If no other bridge was found, check if we have a DPI panel or
* any other bridge connected directly to the MCDE DPI output.
* If a DSI bridge is found, DSI will take precedence.
*
* TODO: more elaborate bridge selection if we have more than one
* thing attached to the system.
*/
if (!mcde->bridge) {
struct drm_panel *panel;
struct drm_bridge *bridge;
ret = drm_of_find_panel_or_bridge(drm->dev->of_node,
0, 0, &panel, &bridge);
if (ret) {
dev_err(drm->dev,
"Could not locate any output bridge or panel\n");
return ret;
}
if (panel) {
bridge = drm_panel_bridge_add_typed(panel,
DRM_MODE_CONNECTOR_DPI);
if (IS_ERR(bridge)) {
dev_err(drm->dev,
"Could not connect panel bridge\n");
return PTR_ERR(bridge);
}
}
mcde->dpi_output = true;
mcde->bridge = bridge;
mcde->flow_mode = MCDE_DPI_FORMATTER_FLOW;
}
mode_config = &drm->mode_config;
mode_config->funcs = &mcde_mode_config_funcs;
mode_config->helper_private = &mcde_mode_config_helpers;
/* This hardware can do 1080p */
mode_config->min_width = 1;
mode_config->max_width = 1920;
mode_config->min_height = 1;
mode_config->max_height = 1080;
ret = drm_vblank_init(drm, 1);
if (ret) {
dev_err(drm->dev, "failed to init vblank\n");
return ret;
}
ret = mcde_display_init(drm);
if (ret) {
dev_err(drm->dev, "failed to init display\n");
return ret;
}
/* Attach the bridge. */
ret = drm_simple_display_pipe_attach_bridge(&mcde->pipe,
mcde->bridge);
if (ret) {
dev_err(drm->dev, "failed to attach display output bridge\n");
return ret;
}
drm_mode_config_reset(drm);
drm_kms_helper_poll_init(drm);
return 0;
}
DEFINE_DRM_GEM_DMA_FOPS(drm_fops);
static const struct drm_driver mcde_drm_driver = {
.driver_features =
DRIVER_MODESET | DRIVER_GEM | DRIVER_ATOMIC,
.ioctls = NULL,
.fops = &drm_fops,
.name = "mcde",
.desc = DRIVER_DESC,
.date = "20180529",
.major = 1,
.minor = 0,
.patchlevel = 0,
DRM_GEM_DMA_DRIVER_OPS,
};
static int mcde_drm_bind(struct device *dev)
{
struct drm_device *drm = dev_get_drvdata(dev);
int ret;
ret = drmm_mode_config_init(drm);
if (ret)
return ret;
ret = component_bind_all(drm->dev, drm);
if (ret) {
dev_err(dev, "can't bind component devices\n");
return ret;
}
ret = mcde_modeset_init(drm);
if (ret)
goto unbind;
ret = drm_dev_register(drm, 0);
if (ret < 0)
goto unbind;
drm_fbdev_dma_setup(drm, 32);
return 0;
unbind:
component_unbind_all(drm->dev, drm);
return ret;
}
static void mcde_drm_unbind(struct device *dev)
{
struct drm_device *drm = dev_get_drvdata(dev);
drm_dev_unregister(drm);
drm_atomic_helper_shutdown(drm);
component_unbind_all(drm->dev, drm);
}
static const struct component_master_ops mcde_drm_comp_ops = {
.bind = mcde_drm_bind,
.unbind = mcde_drm_unbind,
};
static struct platform_driver *const mcde_component_drivers[] = {
&mcde_dsi_driver,
};
static int mcde_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct drm_device *drm;
struct mcde *mcde;
struct component_match *match = NULL;
u32 pid;
int irq;
int ret;
int i;
mcde = devm_drm_dev_alloc(dev, &mcde_drm_driver, struct mcde, drm);
if (IS_ERR(mcde))
return PTR_ERR(mcde);
drm = &mcde->drm;
mcde->dev = dev;
platform_set_drvdata(pdev, drm);
/* First obtain and turn on the main power */
mcde->epod = devm_regulator_get(dev, "epod");
if (IS_ERR(mcde->epod)) {
ret = PTR_ERR(mcde->epod);
dev_err(dev, "can't get EPOD regulator\n");
return ret;
}
ret = regulator_enable(mcde->epod);
if (ret) {
dev_err(dev, "can't enable EPOD regulator\n");
return ret;
}
mcde->vana = devm_regulator_get(dev, "vana");
if (IS_ERR(mcde->vana)) {
ret = PTR_ERR(mcde->vana);
dev_err(dev, "can't get VANA regulator\n");
goto regulator_epod_off;
}
ret = regulator_enable(mcde->vana);
if (ret) {
dev_err(dev, "can't enable VANA regulator\n");
goto regulator_epod_off;
}
/*
* The vendor code uses ESRAM (onchip RAM) and need to activate
* the v-esram34 regulator, but we don't use that yet
*/
/* Clock the silicon so we can access the registers */
mcde->mcde_clk = devm_clk_get(dev, "mcde");
if (IS_ERR(mcde->mcde_clk)) {
dev_err(dev, "unable to get MCDE main clock\n");
ret = PTR_ERR(mcde->mcde_clk);
goto regulator_off;
}
ret = clk_prepare_enable(mcde->mcde_clk);
if (ret) {
dev_err(dev, "failed to enable MCDE main clock\n");
goto regulator_off;
}
dev_info(dev, "MCDE clk rate %lu Hz\n", clk_get_rate(mcde->mcde_clk));
mcde->lcd_clk = devm_clk_get(dev, "lcd");
if (IS_ERR(mcde->lcd_clk)) {
dev_err(dev, "unable to get LCD clock\n");
ret = PTR_ERR(mcde->lcd_clk);
goto clk_disable;
}
mcde->hdmi_clk = devm_clk_get(dev, "hdmi");
if (IS_ERR(mcde->hdmi_clk)) {
dev_err(dev, "unable to get HDMI clock\n");
ret = PTR_ERR(mcde->hdmi_clk);
goto clk_disable;
}
mcde->regs = devm_platform_ioremap_resource(pdev, 0);
if (IS_ERR(mcde->regs)) {
dev_err(dev, "no MCDE regs\n");
ret = -EINVAL;
goto clk_disable;
}
irq = platform_get_irq(pdev, 0);
if (irq < 0) {
ret = irq;
goto clk_disable;
}
ret = devm_request_irq(dev, irq, mcde_irq, 0, "mcde", mcde);
if (ret) {
dev_err(dev, "failed to request irq %d\n", ret);
goto clk_disable;
}
/*
* Check hardware revision, we only support U8500v2 version
* as this was the only version used for mass market deployment,
* but surely you can add more versions if you have them and
* need them.
*/
pid = readl(mcde->regs + MCDE_PID);
dev_info(dev, "found MCDE HW revision %d.%d (dev %d, metal fix %d)\n",
(pid & MCDE_PID_MAJOR_VERSION_MASK)
>> MCDE_PID_MAJOR_VERSION_SHIFT,
(pid & MCDE_PID_MINOR_VERSION_MASK)
>> MCDE_PID_MINOR_VERSION_SHIFT,
(pid & MCDE_PID_DEVELOPMENT_VERSION_MASK)
>> MCDE_PID_DEVELOPMENT_VERSION_SHIFT,
(pid & MCDE_PID_METALFIX_VERSION_MASK)
>> MCDE_PID_METALFIX_VERSION_SHIFT);
if (pid != 0x03000800) {
dev_err(dev, "unsupported hardware revision\n");
ret = -ENODEV;
goto clk_disable;
}
/* Disable and clear any pending interrupts */
mcde_display_disable_irqs(mcde);
writel(0, mcde->regs + MCDE_IMSCERR);
writel(0xFFFFFFFF, mcde->regs + MCDE_RISERR);
/* Spawn child devices for the DSI ports */
devm_of_platform_populate(dev);
/* Create something that will match the subdrivers when we bind */
for (i = 0; i < ARRAY_SIZE(mcde_component_drivers); i++) {
struct device_driver *drv = &mcde_component_drivers[i]->driver;
struct device *p = NULL, *d;
while ((d = platform_find_device_by_driver(p, drv))) {
put_device(p);
component_match_add(dev, &match, component_compare_dev, d);
p = d;
}
put_device(p);
}
if (!match) {
dev_err(dev, "no matching components\n");
ret = -ENODEV;
goto clk_disable;
}
if (IS_ERR(match)) {
dev_err(dev, "could not create component match\n");
ret = PTR_ERR(match);
goto clk_disable;
}
/*
* Perform an invasive reset of the MCDE and all blocks by
* cutting the power to the subsystem, then bring it back up
* later when we enable the display as a result of
* component_master_add_with_match().
*/
ret = regulator_disable(mcde->epod);
if (ret) {
dev_err(dev, "can't disable EPOD regulator\n");
return ret;
}
/* Wait 50 ms so we are sure we cut the power */
usleep_range(50000, 70000);
ret = component_master_add_with_match(&pdev->dev, &mcde_drm_comp_ops,
match);
if (ret) {
dev_err(dev, "failed to add component master\n");
/*
* The EPOD regulator is already disabled at this point so some
* special errorpath code is needed
*/
clk_disable_unprepare(mcde->mcde_clk);
regulator_disable(mcde->vana);
return ret;
}
return 0;
clk_disable:
clk_disable_unprepare(mcde->mcde_clk);
regulator_off:
regulator_disable(mcde->vana);
regulator_epod_off:
regulator_disable(mcde->epod);
return ret;
}
static void mcde_remove(struct platform_device *pdev)
{
struct drm_device *drm = platform_get_drvdata(pdev);
struct mcde *mcde = to_mcde(drm);
component_master_del(&pdev->dev, &mcde_drm_comp_ops);
clk_disable_unprepare(mcde->mcde_clk);
regulator_disable(mcde->vana);
regulator_disable(mcde->epod);
}
static void mcde_shutdown(struct platform_device *pdev)
{
struct drm_device *drm = platform_get_drvdata(pdev);
if (drm->registered)
drm_atomic_helper_shutdown(drm);
}
static const struct of_device_id mcde_of_match[] = {
{
.compatible = "ste,mcde",
},
{},
};
static struct platform_driver mcde_driver = {
.driver = {
.name = "mcde",
.of_match_table = mcde_of_match,
},
.probe = mcde_probe,
.remove_new = mcde_remove,
.shutdown = mcde_shutdown,
};
static struct platform_driver *const component_drivers[] = {
&mcde_dsi_driver,
};
static int __init mcde_drm_register(void)
{
int ret;
if (drm_firmware_drivers_only())
return -ENODEV;
ret = platform_register_drivers(component_drivers,
ARRAY_SIZE(component_drivers));
if (ret)
return ret;
return platform_driver_register(&mcde_driver);
}
static void __exit mcde_drm_unregister(void)
{
platform_unregister_drivers(component_drivers,
ARRAY_SIZE(component_drivers));
platform_driver_unregister(&mcde_driver);
}
module_init(mcde_drm_register);
module_exit(mcde_drm_unregister);
MODULE_ALIAS("platform:mcde-drm");
MODULE_DESCRIPTION(DRIVER_DESC);
MODULE_AUTHOR("Linus Walleij <linus.walleij@linaro.org>");
MODULE_LICENSE("GPL");