// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright (C) 2019-2022 Bootlin
* Author: Paul Kocialkowski <[email protected]>
*/
#include <linux/bitfield.h>
#include <linux/clk.h>
#include <linux/mfd/syscon.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_address.h>
#include <linux/of_reserved_mem.h>
#include <linux/platform_device.h>
#include <linux/regmap.h>
#include <linux/types.h>
#include <drm/drm_atomic_helper.h>
#include <drm/drm_drv.h>
#include <drm/drm_fbdev_dma.h>
#include <drm/drm_gem_dma_helper.h>
#include <drm/drm_print.h>
#include "logicvc_crtc.h"
#include "logicvc_drm.h"
#include "logicvc_interface.h"
#include "logicvc_mode.h"
#include "logicvc_layer.h"
#include "logicvc_of.h"
#include "logicvc_regs.h"
DEFINE_DRM_GEM_DMA_FOPS(logicvc_drm_fops);
static int logicvc_drm_gem_dma_dumb_create(struct drm_file *file_priv,
struct drm_device *drm_dev,
struct drm_mode_create_dumb *args)
{
struct logicvc_drm *logicvc = logicvc_drm(drm_dev);
/* Stride is always fixed to its configuration value. */
args->pitch = logicvc->config.row_stride * DIV_ROUND_UP(args->bpp, 8);
return drm_gem_dma_dumb_create_internal(file_priv, drm_dev, args);
}
static struct drm_driver logicvc_drm_driver = {
.driver_features = DRIVER_GEM | DRIVER_MODESET |
DRIVER_ATOMIC,
.fops = &logicvc_drm_fops,
.name = "logicvc-drm",
.desc = "Xylon LogiCVC DRM driver",
.date = "20200403",
.major = 1,
.minor = 0,
DRM_GEM_DMA_DRIVER_OPS_VMAP_WITH_DUMB_CREATE(logicvc_drm_gem_dma_dumb_create),
};
static struct regmap_config logicvc_drm_regmap_config = {
.reg_bits = 32,
.val_bits = 32,
.reg_stride = 4,
.name = "logicvc-drm",
};
static irqreturn_t logicvc_drm_irq_handler(int irq, void *data)
{
struct logicvc_drm *logicvc = data;
irqreturn_t ret = IRQ_NONE;
u32 stat = 0;
/* Get pending interrupt sources. */
regmap_read(logicvc->regmap, LOGICVC_INT_STAT_REG, &stat);
/* Clear all pending interrupt sources. */
regmap_write(logicvc->regmap, LOGICVC_INT_STAT_REG, stat);
if (stat & LOGICVC_INT_STAT_V_SYNC) {
logicvc_crtc_vblank_handler(logicvc);
ret = IRQ_HANDLED;
}
return ret;
}
static int logicvc_drm_config_parse(struct logicvc_drm *logicvc)
{
struct drm_device *drm_dev = &logicvc->drm_dev;
struct device *dev = drm_dev->dev;
struct device_node *of_node = dev->of_node;
struct logicvc_drm_config *config = &logicvc->config;
struct device_node *layers_node;
int ret;
logicvc_of_property_parse_bool(of_node, LOGICVC_OF_PROPERTY_DITHERING,
&config->dithering);
logicvc_of_property_parse_bool(of_node,
LOGICVC_OF_PROPERTY_BACKGROUND_LAYER,
&config->background_layer);
logicvc_of_property_parse_bool(of_node,
LOGICVC_OF_PROPERTY_LAYERS_CONFIGURABLE,
&config->layers_configurable);
ret = logicvc_of_property_parse_u32(of_node,
LOGICVC_OF_PROPERTY_DISPLAY_INTERFACE,
&config->display_interface);
if (ret)
return ret;
ret = logicvc_of_property_parse_u32(of_node,
LOGICVC_OF_PROPERTY_DISPLAY_COLORSPACE,
&config->display_colorspace);
if (ret)
return ret;
ret = logicvc_of_property_parse_u32(of_node,
LOGICVC_OF_PROPERTY_DISPLAY_DEPTH,
&config->display_depth);
if (ret)
return ret;
ret = logicvc_of_property_parse_u32(of_node,
LOGICVC_OF_PROPERTY_ROW_STRIDE,
&config->row_stride);
if (ret)
return ret;
layers_node = of_get_child_by_name(of_node, "layers");
if (!layers_node) {
drm_err(drm_dev, "Missing non-optional layers node\n");
return -EINVAL;
}
config->layers_count = of_get_child_count(layers_node);
if (!config->layers_count) {
drm_err(drm_dev,
"Missing a non-optional layers children node\n");
return -EINVAL;
}
return 0;
}
static int logicvc_clocks_prepare(struct logicvc_drm *logicvc)
{
struct drm_device *drm_dev = &logicvc->drm_dev;
struct device *dev = drm_dev->dev;
struct {
struct clk **clk;
char *name;
bool optional;
} clocks_map[] = {
{
.clk = &logicvc->vclk,
.name = "vclk",
.optional = false,
},
{
.clk = &logicvc->vclk2,
.name = "vclk2",
.optional = true,
},
{
.clk = &logicvc->lvdsclk,
.name = "lvdsclk",
.optional = true,
},
{
.clk = &logicvc->lvdsclkn,
.name = "lvdsclkn",
.optional = true,
},
};
unsigned int i;
int ret;
for (i = 0; i < ARRAY_SIZE(clocks_map); i++) {
struct clk *clk;
clk = devm_clk_get(dev, clocks_map[i].name);
if (IS_ERR(clk)) {
if (PTR_ERR(clk) == -ENOENT && clocks_map[i].optional)
continue;
drm_err(drm_dev, "Missing non-optional clock %s\n",
clocks_map[i].name);
ret = PTR_ERR(clk);
goto error;
}
ret = clk_prepare_enable(clk);
if (ret) {
drm_err(drm_dev,
"Failed to prepare and enable clock %s\n",
clocks_map[i].name);
goto error;
}
*clocks_map[i].clk = clk;
}
return 0;
error:
for (i = 0; i < ARRAY_SIZE(clocks_map); i++) {
if (!*clocks_map[i].clk)
continue;
clk_disable_unprepare(*clocks_map[i].clk);
*clocks_map[i].clk = NULL;
}
return ret;
}
static int logicvc_clocks_unprepare(struct logicvc_drm *logicvc)
{
struct clk **clocks[] = {
&logicvc->vclk,
&logicvc->vclk2,
&logicvc->lvdsclk,
&logicvc->lvdsclkn,
};
unsigned int i;
for (i = 0; i < ARRAY_SIZE(clocks); i++) {
if (!*clocks[i])
continue;
clk_disable_unprepare(*clocks[i]);
*clocks[i] = NULL;
}
return 0;
}
static const struct logicvc_drm_caps logicvc_drm_caps[] = {
{
.major = 3,
.layer_address = false,
},
{
.major = 4,
.layer_address = true,
},
{
.major = 5,
.layer_address = true,
},
};
static const struct logicvc_drm_caps *
logicvc_drm_caps_match(struct logicvc_drm *logicvc)
{
struct drm_device *drm_dev = &logicvc->drm_dev;
const struct logicvc_drm_caps *caps = NULL;
unsigned int major, minor;
char level;
unsigned int i;
u32 version;
regmap_read(logicvc->regmap, LOGICVC_IP_VERSION_REG, &version);
major = FIELD_GET(LOGICVC_IP_VERSION_MAJOR_MASK, version);
minor = FIELD_GET(LOGICVC_IP_VERSION_MINOR_MASK, version);
level = FIELD_GET(LOGICVC_IP_VERSION_LEVEL_MASK, version) + 'a';
for (i = 0; i < ARRAY_SIZE(logicvc_drm_caps); i++) {
if (logicvc_drm_caps[i].major &&
logicvc_drm_caps[i].major != major)
continue;
if (logicvc_drm_caps[i].minor &&
logicvc_drm_caps[i].minor != minor)
continue;
if (logicvc_drm_caps[i].level &&
logicvc_drm_caps[i].level != level)
continue;
caps = &logicvc_drm_caps[i];
}
drm_info(drm_dev, "LogiCVC version %d.%02d.%c\n", major, minor, level);
return caps;
}
static int logicvc_drm_probe(struct platform_device *pdev)
{
struct device_node *of_node = pdev->dev.of_node;
struct device_node *reserved_mem_node;
struct reserved_mem *reserved_mem = NULL;
const struct logicvc_drm_caps *caps;
struct logicvc_drm *logicvc;
struct device *dev = &pdev->dev;
struct drm_device *drm_dev;
struct regmap *regmap = NULL;
struct resource res;
void __iomem *base;
unsigned int preferred_bpp;
int irq;
int ret;
ret = of_reserved_mem_device_init(dev);
if (ret && ret != -ENODEV) {
dev_err(dev, "Failed to init memory region\n");
goto error_early;
}
reserved_mem_node = of_parse_phandle(of_node, "memory-region", 0);
if (reserved_mem_node) {
reserved_mem = of_reserved_mem_lookup(reserved_mem_node);
of_node_put(reserved_mem_node);
}
/* Get regmap from parent if available. */
if (of_node->parent)
regmap = syscon_node_to_regmap(of_node->parent);
/* Register our own regmap otherwise. */
if (IS_ERR_OR_NULL(regmap)) {
ret = of_address_to_resource(of_node, 0, &res);
if (ret) {
dev_err(dev, "Failed to get resource from address\n");
goto error_reserved_mem;
}
base = devm_ioremap_resource(dev, &res);
if (IS_ERR(base)) {
dev_err(dev, "Failed to map I/O base\n");
ret = PTR_ERR(base);
goto error_reserved_mem;
}
logicvc_drm_regmap_config.max_register = resource_size(&res) -
4;
regmap = devm_regmap_init_mmio(dev, base,
&logicvc_drm_regmap_config);
if (IS_ERR(regmap)) {
dev_err(dev, "Failed to create regmap for I/O\n");
ret = PTR_ERR(regmap);
goto error_reserved_mem;
}
}
irq = platform_get_irq(pdev, 0);
if (irq < 0) {
ret = -ENODEV;
goto error_reserved_mem;
}
logicvc = devm_drm_dev_alloc(dev, &logicvc_drm_driver,
struct logicvc_drm, drm_dev);
if (IS_ERR(logicvc)) {
ret = PTR_ERR(logicvc);
goto error_reserved_mem;
}
platform_set_drvdata(pdev, logicvc);
drm_dev = &logicvc->drm_dev;
logicvc->regmap = regmap;
INIT_LIST_HEAD(&logicvc->layers_list);
caps = logicvc_drm_caps_match(logicvc);
if (!caps) {
ret = -EINVAL;
goto error_reserved_mem;
}
logicvc->caps = caps;
if (reserved_mem)
logicvc->reserved_mem_base = reserved_mem->base;
ret = logicvc_clocks_prepare(logicvc);
if (ret) {
drm_err(drm_dev, "Failed to prepare clocks\n");
goto error_reserved_mem;
}
ret = devm_request_irq(dev, irq, logicvc_drm_irq_handler, 0,
dev_name(dev), logicvc);
if (ret) {
drm_err(drm_dev, "Failed to request IRQ\n");
goto error_clocks;
}
ret = logicvc_drm_config_parse(logicvc);
if (ret && ret != -ENODEV) {
drm_err(drm_dev, "Failed to parse config\n");
goto error_clocks;
}
ret = drmm_mode_config_init(drm_dev);
if (ret) {
drm_err(drm_dev, "Failed to init mode config\n");
goto error_clocks;
}
ret = logicvc_layers_init(logicvc);
if (ret) {
drm_err(drm_dev, "Failed to initialize layers\n");
goto error_clocks;
}
ret = logicvc_crtc_init(logicvc);
if (ret) {
drm_err(drm_dev, "Failed to initialize CRTC\n");
goto error_clocks;
}
logicvc_layers_attach_crtc(logicvc);
ret = logicvc_interface_init(logicvc);
if (ret) {
if (ret != -EPROBE_DEFER)
drm_err(drm_dev, "Failed to initialize interface\n");
goto error_clocks;
}
logicvc_interface_attach_crtc(logicvc);
ret = logicvc_mode_init(logicvc);
if (ret) {
drm_err(drm_dev, "Failed to initialize KMS\n");
goto error_clocks;
}
ret = drm_dev_register(drm_dev, 0);
if (ret) {
drm_err(drm_dev, "Failed to register DRM device\n");
goto error_mode;
}
switch (drm_dev->mode_config.preferred_depth) {
case 16:
preferred_bpp = 16;
break;
case 24:
case 32:
default:
preferred_bpp = 32;
break;
}
drm_fbdev_dma_setup(drm_dev, preferred_bpp);
return 0;
error_mode:
logicvc_mode_fini(logicvc);
error_clocks:
logicvc_clocks_unprepare(logicvc);
error_reserved_mem:
of_reserved_mem_device_release(dev);
error_early:
return ret;
}
static void logicvc_drm_remove(struct platform_device *pdev)
{
struct logicvc_drm *logicvc = platform_get_drvdata(pdev);
struct device *dev = &pdev->dev;
struct drm_device *drm_dev = &logicvc->drm_dev;
drm_dev_unregister(drm_dev);
drm_atomic_helper_shutdown(drm_dev);
logicvc_mode_fini(logicvc);
logicvc_clocks_unprepare(logicvc);
of_reserved_mem_device_release(dev);
}
static void logicvc_drm_shutdown(struct platform_device *pdev)
{
struct logicvc_drm *logicvc = platform_get_drvdata(pdev);
struct drm_device *drm_dev = &logicvc->drm_dev;
drm_atomic_helper_shutdown(drm_dev);
}
static const struct of_device_id logicvc_drm_of_table[] = {
{ .compatible = "xylon,logicvc-3.02.a-display" },
{ .compatible = "xylon,logicvc-4.01.a-display" },
{},
};
MODULE_DEVICE_TABLE(of, logicvc_drm_of_table);
static struct platform_driver logicvc_drm_platform_driver = {
.probe = logicvc_drm_probe,
.remove_new = logicvc_drm_remove,
.shutdown = logicvc_drm_shutdown,
.driver = {
.name = "logicvc-drm",
.of_match_table = logicvc_drm_of_table,
},
};
module_platform_driver(logicvc_drm_platform_driver);
MODULE_AUTHOR("Paul Kocialkowski <[email protected]>");
MODULE_DESCRIPTION("Xylon LogiCVC DRM driver");
MODULE_LICENSE("GPL");
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