// SPDX-License-Identifier: GPL-2.0-only
#include <linux/clk.h>
#include <linux/of_clk.h>
#include <linux/minmax.h>
#include <linux/of_address.h>
#include <linux/platform_data/simplefb.h>
#include <linux/platform_device.h>
#include <linux/pm_domain.h>
#include <linux/regulator/consumer.h>
#include <drm/drm_aperture.h>
#include <drm/drm_atomic.h>
#include <drm/drm_atomic_state_helper.h>
#include <drm/drm_connector.h>
#include <drm/drm_crtc_helper.h>
#include <drm/drm_damage_helper.h>
#include <drm/drm_device.h>
#include <drm/drm_drv.h>
#include <drm/drm_fbdev_generic.h>
#include <drm/drm_format_helper.h>
#include <drm/drm_framebuffer.h>
#include <drm/drm_gem_atomic_helper.h>
#include <drm/drm_gem_framebuffer_helper.h>
#include <drm/drm_gem_shmem_helper.h>
#include <drm/drm_managed.h>
#include <drm/drm_modeset_helper_vtables.h>
#include <drm/drm_probe_helper.h>
#define DRIVER_NAME "simpledrm"
#define DRIVER_DESC "DRM driver for simple-framebuffer platform devices"
#define DRIVER_DATE "20200625"
#define DRIVER_MAJOR 1
#define DRIVER_MINOR 0
/*
* Helpers for simplefb
*/
static int
simplefb_get_validated_int(struct drm_device *dev, const char *name,
uint32_t value)
{
if (value > INT_MAX) {
drm_err(dev, "simplefb: invalid framebuffer %s of %u\n",
name, value);
return -EINVAL;
}
return (int)value;
}
static int
simplefb_get_validated_int0(struct drm_device *dev, const char *name,
uint32_t value)
{
if (!value) {
drm_err(dev, "simplefb: invalid framebuffer %s of %u\n",
name, value);
return -EINVAL;
}
return simplefb_get_validated_int(dev, name, value);
}
static const struct drm_format_info *
simplefb_get_validated_format(struct drm_device *dev, const char *format_name)
{
static const struct simplefb_format formats[] = SIMPLEFB_FORMATS;
const struct simplefb_format *fmt = formats;
const struct simplefb_format *end = fmt + ARRAY_SIZE(formats);
const struct drm_format_info *info;
if (!format_name) {
drm_err(dev, "simplefb: missing framebuffer format\n");
return ERR_PTR(-EINVAL);
}
while (fmt < end) {
if (!strcmp(format_name, fmt->name)) {
info = drm_format_info(fmt->fourcc);
if (!info)
return ERR_PTR(-EINVAL);
return info;
}
++fmt;
}
drm_err(dev, "simplefb: unknown framebuffer format %s\n",
format_name);
return ERR_PTR(-EINVAL);
}
static int
simplefb_get_width_pd(struct drm_device *dev,
const struct simplefb_platform_data *pd)
{
return simplefb_get_validated_int0(dev, "width", pd->width);
}
static int
simplefb_get_height_pd(struct drm_device *dev,
const struct simplefb_platform_data *pd)
{
return simplefb_get_validated_int0(dev, "height", pd->height);
}
static int
simplefb_get_stride_pd(struct drm_device *dev,
const struct simplefb_platform_data *pd)
{
return simplefb_get_validated_int(dev, "stride", pd->stride);
}
static const struct drm_format_info *
simplefb_get_format_pd(struct drm_device *dev,
const struct simplefb_platform_data *pd)
{
return simplefb_get_validated_format(dev, pd->format);
}
static int
simplefb_read_u32_of(struct drm_device *dev, struct device_node *of_node,
const char *name, u32 *value)
{
int ret = of_property_read_u32(of_node, name, value);
if (ret)
drm_err(dev, "simplefb: cannot parse framebuffer %s: error %d\n",
name, ret);
return ret;
}
static int
simplefb_read_string_of(struct drm_device *dev, struct device_node *of_node,
const char *name, const char **value)
{
int ret = of_property_read_string(of_node, name, value);
if (ret)
drm_err(dev, "simplefb: cannot parse framebuffer %s: error %d\n",
name, ret);
return ret;
}
static int
simplefb_get_width_of(struct drm_device *dev, struct device_node *of_node)
{
u32 width;
int ret = simplefb_read_u32_of(dev, of_node, "width", &width);
if (ret)
return ret;
return simplefb_get_validated_int0(dev, "width", width);
}
static int
simplefb_get_height_of(struct drm_device *dev, struct device_node *of_node)
{
u32 height;
int ret = simplefb_read_u32_of(dev, of_node, "height", &height);
if (ret)
return ret;
return simplefb_get_validated_int0(dev, "height", height);
}
static int
simplefb_get_stride_of(struct drm_device *dev, struct device_node *of_node)
{
u32 stride;
int ret = simplefb_read_u32_of(dev, of_node, "stride", &stride);
if (ret)
return ret;
return simplefb_get_validated_int(dev, "stride", stride);
}
static const struct drm_format_info *
simplefb_get_format_of(struct drm_device *dev, struct device_node *of_node)
{
const char *format;
int ret = simplefb_read_string_of(dev, of_node, "format", &format);
if (ret)
return ERR_PTR(ret);
return simplefb_get_validated_format(dev, format);
}
static struct resource *
simplefb_get_memory_of(struct drm_device *dev, struct device_node *of_node)
{
struct device_node *np;
struct resource *res;
int err;
np = of_parse_phandle(of_node, "memory-region", 0);
if (!np)
return NULL;
res = devm_kzalloc(dev->dev, sizeof(*res), GFP_KERNEL);
if (!res)
return ERR_PTR(-ENOMEM);
err = of_address_to_resource(np, 0, res);
if (err)
return ERR_PTR(err);
if (of_property_present(of_node, "reg"))
drm_warn(dev, "preferring \"memory-region\" over \"reg\" property\n");
return res;
}
/*
* Simple Framebuffer device
*/
struct simpledrm_device {
struct drm_device dev;
/* clocks */
#if defined CONFIG_OF && defined CONFIG_COMMON_CLK
unsigned int clk_count;
struct clk **clks;
#endif
/* regulators */
#if defined CONFIG_OF && defined CONFIG_REGULATOR
unsigned int regulator_count;
struct regulator **regulators;
#endif
/* power-domains */
#if defined CONFIG_OF && defined CONFIG_PM_GENERIC_DOMAINS
int pwr_dom_count;
struct device **pwr_dom_devs;
struct device_link **pwr_dom_links;
#endif
/* simplefb settings */
struct drm_display_mode mode;
const struct drm_format_info *format;
unsigned int pitch;
/* memory management */
struct iosys_map screen_base;
/* modesetting */
uint32_t formats[8];
size_t nformats;
struct drm_plane primary_plane;
struct drm_crtc crtc;
struct drm_encoder encoder;
struct drm_connector connector;
};
static struct simpledrm_device *simpledrm_device_of_dev(struct drm_device *dev)
{
return container_of(dev, struct simpledrm_device, dev);
}
/*
* Hardware
*/
#if defined CONFIG_OF && defined CONFIG_COMMON_CLK
/*
* Clock handling code.
*
* Here we handle the clocks property of our "simple-framebuffer" dt node.
* This is necessary so that we can make sure that any clocks needed by
* the display engine that the bootloader set up for us (and for which it
* provided a simplefb dt node), stay up, for the life of the simplefb
* driver.
*
* When the driver unloads, we cleanly disable, and then release the clocks.
*
* We only complain about errors here, no action is taken as the most likely
* error can only happen due to a mismatch between the bootloader which set
* up simplefb, and the clock definitions in the device tree. Chances are
* that there are no adverse effects, and if there are, a clean teardown of
* the fb probe will not help us much either. So just complain and carry on,
* and hope that the user actually gets a working fb at the end of things.
*/
static void simpledrm_device_release_clocks(void *res)
{
struct simpledrm_device *sdev = simpledrm_device_of_dev(res);
unsigned int i;
for (i = 0; i < sdev->clk_count; ++i) {
if (sdev->clks[i]) {
clk_disable_unprepare(sdev->clks[i]);
clk_put(sdev->clks[i]);
}
}
}
static int simpledrm_device_init_clocks(struct simpledrm_device *sdev)
{
struct drm_device *dev = &sdev->dev;
struct platform_device *pdev = to_platform_device(dev->dev);
struct device_node *of_node = pdev->dev.of_node;
struct clk *clock;
unsigned int i;
int ret;
if (dev_get_platdata(&pdev->dev) || !of_node)
return 0;
sdev->clk_count = of_clk_get_parent_count(of_node);
if (!sdev->clk_count)
return 0;
sdev->clks = drmm_kzalloc(dev, sdev->clk_count * sizeof(sdev->clks[0]),
GFP_KERNEL);
if (!sdev->clks)
return -ENOMEM;
for (i = 0; i < sdev->clk_count; ++i) {
clock = of_clk_get(of_node, i);
if (IS_ERR(clock)) {
ret = PTR_ERR(clock);
if (ret == -EPROBE_DEFER)
goto err;
drm_err(dev, "clock %u not found: %d\n", i, ret);
continue;
}
ret = clk_prepare_enable(clock);
if (ret) {
drm_err(dev, "failed to enable clock %u: %d\n",
i, ret);
clk_put(clock);
continue;
}
sdev->clks[i] = clock;
}
return devm_add_action_or_reset(&pdev->dev,
simpledrm_device_release_clocks,
sdev);
err:
while (i) {
--i;
if (sdev->clks[i]) {
clk_disable_unprepare(sdev->clks[i]);
clk_put(sdev->clks[i]);
}
}
return ret;
}
#else
static int simpledrm_device_init_clocks(struct simpledrm_device *sdev)
{
return 0;
}
#endif
#if defined CONFIG_OF && defined CONFIG_REGULATOR
#define SUPPLY_SUFFIX "-supply"
/*
* Regulator handling code.
*
* Here we handle the num-supplies and vin*-supply properties of our
* "simple-framebuffer" dt node. This is necessary so that we can make sure
* that any regulators needed by the display hardware that the bootloader
* set up for us (and for which it provided a simplefb dt node), stay up,
* for the life of the simplefb driver.
*
* When the driver unloads, we cleanly disable, and then release the
* regulators.
*
* We only complain about errors here, no action is taken as the most likely
* error can only happen due to a mismatch between the bootloader which set
* up simplefb, and the regulator definitions in the device tree. Chances are
* that there are no adverse effects, and if there are, a clean teardown of
* the fb probe will not help us much either. So just complain and carry on,
* and hope that the user actually gets a working fb at the end of things.
*/
static void simpledrm_device_release_regulators(void *res)
{
struct simpledrm_device *sdev = simpledrm_device_of_dev(res);
unsigned int i;
for (i = 0; i < sdev->regulator_count; ++i) {
if (sdev->regulators[i]) {
regulator_disable(sdev->regulators[i]);
regulator_put(sdev->regulators[i]);
}
}
}
static int simpledrm_device_init_regulators(struct simpledrm_device *sdev)
{
struct drm_device *dev = &sdev->dev;
struct platform_device *pdev = to_platform_device(dev->dev);
struct device_node *of_node = pdev->dev.of_node;
struct property *prop;
struct regulator *regulator;
const char *p;
unsigned int count = 0, i = 0;
int ret;
if (dev_get_platdata(&pdev->dev) || !of_node)
return 0;
/* Count the number of regulator supplies */
for_each_property_of_node(of_node, prop) {
p = strstr(prop->name, SUPPLY_SUFFIX);
if (p && p != prop->name)
++count;
}
if (!count)
return 0;
sdev->regulators = drmm_kzalloc(dev,
count * sizeof(sdev->regulators[0]),
GFP_KERNEL);
if (!sdev->regulators)
return -ENOMEM;
for_each_property_of_node(of_node, prop) {
char name[32]; /* 32 is max size of property name */
size_t len;
p = strstr(prop->name, SUPPLY_SUFFIX);
if (!p || p == prop->name)
continue;
len = strlen(prop->name) - strlen(SUPPLY_SUFFIX) + 1;
strscpy(name, prop->name, min(sizeof(name), len));
regulator = regulator_get_optional(&pdev->dev, name);
if (IS_ERR(regulator)) {
ret = PTR_ERR(regulator);
if (ret == -EPROBE_DEFER)
goto err;
drm_err(dev, "regulator %s not found: %d\n",
name, ret);
continue;
}
ret = regulator_enable(regulator);
if (ret) {
drm_err(dev, "failed to enable regulator %u: %d\n",
i, ret);
regulator_put(regulator);
continue;
}
sdev->regulators[i++] = regulator;
}
sdev->regulator_count = i;
return devm_add_action_or_reset(&pdev->dev,
simpledrm_device_release_regulators,
sdev);
err:
while (i) {
--i;
if (sdev->regulators[i]) {
regulator_disable(sdev->regulators[i]);
regulator_put(sdev->regulators[i]);
}
}
return ret;
}
#else
static int simpledrm_device_init_regulators(struct simpledrm_device *sdev)
{
return 0;
}
#endif
#if defined CONFIG_OF && defined CONFIG_PM_GENERIC_DOMAINS
/*
* Generic power domain handling code.
*
* Here we handle the power-domains properties of our "simple-framebuffer"
* dt node. This is only necessary if there is more than one power-domain.
* A single power-domains is handled automatically by the driver core. Multiple
* power-domains have to be handled by drivers since the driver core can't know
* the correct power sequencing. Power sequencing is not an issue for simpledrm
* since the bootloader has put the power domains already in the correct state.
* simpledrm has only to ensure they remain active for its lifetime.
*
* When the driver unloads, we detach from the power-domains.
*
* We only complain about errors here, no action is taken as the most likely
* error can only happen due to a mismatch between the bootloader which set
* up the "simple-framebuffer" dt node, and the PM domain providers in the
* device tree. Chances are that there are no adverse effects, and if there are,
* a clean teardown of the fb probe will not help us much either. So just
* complain and carry on, and hope that the user actually gets a working fb at
* the end of things.
*/
static void simpledrm_device_detach_genpd(void *res)
{
int i;
struct simpledrm_device *sdev = res;
if (sdev->pwr_dom_count <= 1)
return;
for (i = sdev->pwr_dom_count - 1; i >= 0; i--) {
if (sdev->pwr_dom_links[i])
device_link_del(sdev->pwr_dom_links[i]);
if (!IS_ERR_OR_NULL(sdev->pwr_dom_devs[i]))
dev_pm_domain_detach(sdev->pwr_dom_devs[i], true);
}
}
static int simpledrm_device_attach_genpd(struct simpledrm_device *sdev)
{
struct device *dev = sdev->dev.dev;
int i;
sdev->pwr_dom_count = of_count_phandle_with_args(dev->of_node, "power-domains",
"#power-domain-cells");
/*
* Single power-domain devices are handled by driver core nothing to do
* here. The same for device nodes without "power-domains" property.
*/
if (sdev->pwr_dom_count <= 1)
return 0;
sdev->pwr_dom_devs = devm_kcalloc(dev, sdev->pwr_dom_count,
sizeof(*sdev->pwr_dom_devs),
GFP_KERNEL);
if (!sdev->pwr_dom_devs)
return -ENOMEM;
sdev->pwr_dom_links = devm_kcalloc(dev, sdev->pwr_dom_count,
sizeof(*sdev->pwr_dom_links),
GFP_KERNEL);
if (!sdev->pwr_dom_links)
return -ENOMEM;
for (i = 0; i < sdev->pwr_dom_count; i++) {
sdev->pwr_dom_devs[i] = dev_pm_domain_attach_by_id(dev, i);
if (IS_ERR(sdev->pwr_dom_devs[i])) {
int ret = PTR_ERR(sdev->pwr_dom_devs[i]);
if (ret == -EPROBE_DEFER) {
simpledrm_device_detach_genpd(sdev);
return ret;
}
drm_warn(&sdev->dev,
"pm_domain_attach_by_id(%u) failed: %d\n", i, ret);
continue;
}
sdev->pwr_dom_links[i] = device_link_add(dev,
sdev->pwr_dom_devs[i],
DL_FLAG_STATELESS |
DL_FLAG_PM_RUNTIME |
DL_FLAG_RPM_ACTIVE);
if (!sdev->pwr_dom_links[i])
drm_warn(&sdev->dev, "failed to link power-domain %d\n", i);
}
return devm_add_action_or_reset(dev, simpledrm_device_detach_genpd, sdev);
}
#else
static int simpledrm_device_attach_genpd(struct simpledrm_device *sdev)
{
return 0;
}
#endif
/*
* Modesetting
*/
static const uint64_t simpledrm_primary_plane_format_modifiers[] = {
DRM_FORMAT_MOD_LINEAR,
DRM_FORMAT_MOD_INVALID
};
static int simpledrm_primary_plane_helper_atomic_check(struct drm_plane *plane,
struct drm_atomic_state *state)
{
struct drm_plane_state *new_plane_state = drm_atomic_get_new_plane_state(state, plane);
struct drm_shadow_plane_state *new_shadow_plane_state =
to_drm_shadow_plane_state(new_plane_state);
struct drm_framebuffer *new_fb = new_plane_state->fb;
struct drm_crtc *new_crtc = new_plane_state->crtc;
struct drm_crtc_state *new_crtc_state = NULL;
struct drm_device *dev = plane->dev;
struct simpledrm_device *sdev = simpledrm_device_of_dev(dev);
int ret;
if (new_crtc)
new_crtc_state = drm_atomic_get_new_crtc_state(state, new_crtc);
ret = drm_atomic_helper_check_plane_state(new_plane_state, new_crtc_state,
DRM_PLANE_NO_SCALING,
DRM_PLANE_NO_SCALING,
false, false);
if (ret)
return ret;
else if (!new_plane_state->visible)
return 0;
if (new_fb->format != sdev->format) {
void *buf;
/* format conversion necessary; reserve buffer */
buf = drm_format_conv_state_reserve(&new_shadow_plane_state->fmtcnv_state,
sdev->pitch, GFP_KERNEL);
if (!buf)
return -ENOMEM;
}
return 0;
}
static void simpledrm_primary_plane_helper_atomic_update(struct drm_plane *plane,
struct drm_atomic_state *state)
{
struct drm_plane_state *plane_state = drm_atomic_get_new_plane_state(state, plane);
struct drm_plane_state *old_plane_state = drm_atomic_get_old_plane_state(state, plane);
struct drm_shadow_plane_state *shadow_plane_state = to_drm_shadow_plane_state(plane_state);
struct drm_framebuffer *fb = plane_state->fb;
struct drm_device *dev = plane->dev;
struct simpledrm_device *sdev = simpledrm_device_of_dev(dev);
struct drm_atomic_helper_damage_iter iter;
struct drm_rect damage;
int ret, idx;
ret = drm_gem_fb_begin_cpu_access(fb, DMA_FROM_DEVICE);
if (ret)
return;
if (!drm_dev_enter(dev, &idx))
goto out_drm_gem_fb_end_cpu_access;
drm_atomic_helper_damage_iter_init(&iter, old_plane_state, plane_state);
drm_atomic_for_each_plane_damage(&iter, &damage) {
struct drm_rect dst_clip = plane_state->dst;
struct iosys_map dst = sdev->screen_base;
if (!drm_rect_intersect(&dst_clip, &damage))
continue;
iosys_map_incr(&dst, drm_fb_clip_offset(sdev->pitch, sdev->format, &dst_clip));
drm_fb_blit(&dst, &sdev->pitch, sdev->format->format, shadow_plane_state->data,
fb, &damage, &shadow_plane_state->fmtcnv_state);
}
drm_dev_exit(idx);
out_drm_gem_fb_end_cpu_access:
drm_gem_fb_end_cpu_access(fb, DMA_FROM_DEVICE);
}
static void simpledrm_primary_plane_helper_atomic_disable(struct drm_plane *plane,
struct drm_atomic_state *state)
{
struct drm_device *dev = plane->dev;
struct simpledrm_device *sdev = simpledrm_device_of_dev(dev);
int idx;
if (!drm_dev_enter(dev, &idx))
return;
/* Clear screen to black if disabled */
iosys_map_memset(&sdev->screen_base, 0, 0, sdev->pitch * sdev->mode.vdisplay);
drm_dev_exit(idx);
}
static const struct drm_plane_helper_funcs simpledrm_primary_plane_helper_funcs = {
DRM_GEM_SHADOW_PLANE_HELPER_FUNCS,
.atomic_check = simpledrm_primary_plane_helper_atomic_check,
.atomic_update = simpledrm_primary_plane_helper_atomic_update,
.atomic_disable = simpledrm_primary_plane_helper_atomic_disable,
};
static const struct drm_plane_funcs simpledrm_primary_plane_funcs = {
.update_plane = drm_atomic_helper_update_plane,
.disable_plane = drm_atomic_helper_disable_plane,
.destroy = drm_plane_cleanup,
DRM_GEM_SHADOW_PLANE_FUNCS,
};
static enum drm_mode_status simpledrm_crtc_helper_mode_valid(struct drm_crtc *crtc,
const struct drm_display_mode *mode)
{
struct simpledrm_device *sdev = simpledrm_device_of_dev(crtc->dev);
return drm_crtc_helper_mode_valid_fixed(crtc, mode, &sdev->mode);
}
/*
* The CRTC is always enabled. Screen updates are performed by
* the primary plane's atomic_update function. Disabling clears
* the screen in the primary plane's atomic_disable function.
*/
static const struct drm_crtc_helper_funcs simpledrm_crtc_helper_funcs = {
.mode_valid = simpledrm_crtc_helper_mode_valid,
.atomic_check = drm_crtc_helper_atomic_check,
};
static const struct drm_crtc_funcs simpledrm_crtc_funcs = {
.reset = drm_atomic_helper_crtc_reset,
.destroy = drm_crtc_cleanup,
.set_config = drm_atomic_helper_set_config,
.page_flip = drm_atomic_helper_page_flip,
.atomic_duplicate_state = drm_atomic_helper_crtc_duplicate_state,
.atomic_destroy_state = drm_atomic_helper_crtc_destroy_state,
};
static const struct drm_encoder_funcs simpledrm_encoder_funcs = {
.destroy = drm_encoder_cleanup,
};
static int simpledrm_connector_helper_get_modes(struct drm_connector *connector)
{
struct simpledrm_device *sdev = simpledrm_device_of_dev(connector->dev);
return drm_connector_helper_get_modes_fixed(connector, &sdev->mode);
}
static const struct drm_connector_helper_funcs simpledrm_connector_helper_funcs = {
.get_modes = simpledrm_connector_helper_get_modes,
};
static const struct drm_connector_funcs simpledrm_connector_funcs = {
.reset = drm_atomic_helper_connector_reset,
.fill_modes = drm_helper_probe_single_connector_modes,
.destroy = drm_connector_cleanup,
.atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
.atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
};
static const struct drm_mode_config_funcs simpledrm_mode_config_funcs = {
.fb_create = drm_gem_fb_create_with_dirty,
.atomic_check = drm_atomic_helper_check,
.atomic_commit = drm_atomic_helper_commit,
};
/*
* Init / Cleanup
*/
static struct drm_display_mode simpledrm_mode(unsigned int width,
unsigned int height,
unsigned int width_mm,
unsigned int height_mm)
{
const struct drm_display_mode mode = {
DRM_MODE_INIT(60, width, height, width_mm, height_mm)
};
return mode;
}
static struct simpledrm_device *simpledrm_device_create(struct drm_driver *drv,
struct platform_device *pdev)
{
const struct simplefb_platform_data *pd = dev_get_platdata(&pdev->dev);
struct device_node *of_node = pdev->dev.of_node;
struct simpledrm_device *sdev;
struct drm_device *dev;
int width, height, stride;
int width_mm = 0, height_mm = 0;
struct device_node *panel_node;
const struct drm_format_info *format;
struct resource *res, *mem = NULL;
struct drm_plane *primary_plane;
struct drm_crtc *crtc;
struct drm_encoder *encoder;
struct drm_connector *connector;
unsigned long max_width, max_height;
size_t nformats;
int ret;
sdev = devm_drm_dev_alloc(&pdev->dev, drv, struct simpledrm_device, dev);
if (IS_ERR(sdev))
return ERR_CAST(sdev);
dev = &sdev->dev;
platform_set_drvdata(pdev, sdev);
/*
* Hardware settings
*/
ret = simpledrm_device_init_clocks(sdev);
if (ret)
return ERR_PTR(ret);
ret = simpledrm_device_init_regulators(sdev);
if (ret)
return ERR_PTR(ret);
ret = simpledrm_device_attach_genpd(sdev);
if (ret)
return ERR_PTR(ret);
if (pd) {
width = simplefb_get_width_pd(dev, pd);
if (width < 0)
return ERR_PTR(width);
height = simplefb_get_height_pd(dev, pd);
if (height < 0)
return ERR_PTR(height);
stride = simplefb_get_stride_pd(dev, pd);
if (stride < 0)
return ERR_PTR(stride);
format = simplefb_get_format_pd(dev, pd);
if (IS_ERR(format))
return ERR_CAST(format);
} else if (of_node) {
width = simplefb_get_width_of(dev, of_node);
if (width < 0)
return ERR_PTR(width);
height = simplefb_get_height_of(dev, of_node);
if (height < 0)
return ERR_PTR(height);
stride = simplefb_get_stride_of(dev, of_node);
if (stride < 0)
return ERR_PTR(stride);
format = simplefb_get_format_of(dev, of_node);
if (IS_ERR(format))
return ERR_CAST(format);
mem = simplefb_get_memory_of(dev, of_node);
if (IS_ERR(mem))
return ERR_CAST(mem);
panel_node = of_parse_phandle(of_node, "panel", 0);
if (panel_node) {
simplefb_read_u32_of(dev, panel_node, "width-mm", &width_mm);
simplefb_read_u32_of(dev, panel_node, "height-mm", &height_mm);
of_node_put(panel_node);
}
} else {
drm_err(dev, "no simplefb configuration found\n");
return ERR_PTR(-ENODEV);
}
if (!stride) {
stride = drm_format_info_min_pitch(format, 0, width);
if (drm_WARN_ON(dev, !stride))
return ERR_PTR(-EINVAL);
}
/*
* Assume a monitor resolution of 96 dpi if physical dimensions
* are not specified to get a somewhat reasonable screen size.
*/
if (!width_mm)
width_mm = DRM_MODE_RES_MM(width, 96ul);
if (!height_mm)
height_mm = DRM_MODE_RES_MM(height, 96ul);
sdev->mode = simpledrm_mode(width, height, width_mm, height_mm);
sdev->format = format;
sdev->pitch = stride;
drm_dbg(dev, "display mode={" DRM_MODE_FMT "}\n", DRM_MODE_ARG(&sdev->mode));
drm_dbg(dev, "framebuffer format=%p4cc, size=%dx%d, stride=%d byte\n",
&format->format, width, height, stride);
/*
* Memory management
*/
if (mem) {
void *screen_base;
ret = devm_aperture_acquire_from_firmware(dev, mem->start, resource_size(mem));
if (ret) {
drm_err(dev, "could not acquire memory range %pr: %d\n", mem, ret);
return ERR_PTR(ret);
}
drm_dbg(dev, "using system memory framebuffer at %pr\n", mem);
screen_base = devm_memremap(dev->dev, mem->start, resource_size(mem), MEMREMAP_WC);
if (IS_ERR(screen_base))
return screen_base;
iosys_map_set_vaddr(&sdev->screen_base, screen_base);
} else {
void __iomem *screen_base;
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!res)
return ERR_PTR(-EINVAL);
ret = devm_aperture_acquire_from_firmware(dev, res->start, resource_size(res));
if (ret) {
drm_err(dev, "could not acquire memory range %pr: %d\n", res, ret);
return ERR_PTR(ret);
}
drm_dbg(dev, "using I/O memory framebuffer at %pr\n", res);
mem = devm_request_mem_region(&pdev->dev, res->start, resource_size(res),
drv->name);
if (!mem) {
/*
* We cannot make this fatal. Sometimes this comes from magic
* spaces our resource handlers simply don't know about. Use
* the I/O-memory resource as-is and try to map that instead.
*/
drm_warn(dev, "could not acquire memory region %pr\n", res);
mem = res;
}
screen_base = devm_ioremap_wc(&pdev->dev, mem->start, resource_size(mem));
if (!screen_base)
return ERR_PTR(-ENOMEM);
iosys_map_set_vaddr_iomem(&sdev->screen_base, screen_base);
}
/*
* Modesetting
*/
ret = drmm_mode_config_init(dev);
if (ret)
return ERR_PTR(ret);
max_width = max_t(unsigned long, width, DRM_SHADOW_PLANE_MAX_WIDTH);
max_height = max_t(unsigned long, height, DRM_SHADOW_PLANE_MAX_HEIGHT);
dev->mode_config.min_width = width;
dev->mode_config.max_width = max_width;
dev->mode_config.min_height = height;
dev->mode_config.max_height = max_height;
dev->mode_config.preferred_depth = format->depth;
dev->mode_config.funcs = &simpledrm_mode_config_funcs;
/* Primary plane */
nformats = drm_fb_build_fourcc_list(dev, &format->format, 1,
sdev->formats, ARRAY_SIZE(sdev->formats));
primary_plane = &sdev->primary_plane;
ret = drm_universal_plane_init(dev, primary_plane, 0, &simpledrm_primary_plane_funcs,
sdev->formats, nformats,
simpledrm_primary_plane_format_modifiers,
DRM_PLANE_TYPE_PRIMARY, NULL);
if (ret)
return ERR_PTR(ret);
drm_plane_helper_add(primary_plane, &simpledrm_primary_plane_helper_funcs);
drm_plane_enable_fb_damage_clips(primary_plane);
/* CRTC */
crtc = &sdev->crtc;
ret = drm_crtc_init_with_planes(dev, crtc, primary_plane, NULL,
&simpledrm_crtc_funcs, NULL);
if (ret)
return ERR_PTR(ret);
drm_crtc_helper_add(crtc, &simpledrm_crtc_helper_funcs);
/* Encoder */
encoder = &sdev->encoder;
ret = drm_encoder_init(dev, encoder, &simpledrm_encoder_funcs,
DRM_MODE_ENCODER_NONE, NULL);
if (ret)
return ERR_PTR(ret);
encoder->possible_crtcs = drm_crtc_mask(crtc);
/* Connector */
connector = &sdev->connector;
ret = drm_connector_init(dev, connector, &simpledrm_connector_funcs,
DRM_MODE_CONNECTOR_Unknown);
if (ret)
return ERR_PTR(ret);
drm_connector_helper_add(connector, &simpledrm_connector_helper_funcs);
drm_connector_set_panel_orientation_with_quirk(connector,
DRM_MODE_PANEL_ORIENTATION_UNKNOWN,
width, height);
ret = drm_connector_attach_encoder(connector, encoder);
if (ret)
return ERR_PTR(ret);
drm_mode_config_reset(dev);
return sdev;
}
/*
* DRM driver
*/
DEFINE_DRM_GEM_FOPS(simpledrm_fops);
static struct drm_driver simpledrm_driver = {
DRM_GEM_SHMEM_DRIVER_OPS,
.name = DRIVER_NAME,
.desc = DRIVER_DESC,
.date = DRIVER_DATE,
.major = DRIVER_MAJOR,
.minor = DRIVER_MINOR,
.driver_features = DRIVER_ATOMIC | DRIVER_GEM | DRIVER_MODESET,
.fops = &simpledrm_fops,
};
/*
* Platform driver
*/
static int simpledrm_probe(struct platform_device *pdev)
{
struct simpledrm_device *sdev;
struct drm_device *dev;
unsigned int color_mode;
int ret;
sdev = simpledrm_device_create(&simpledrm_driver, pdev);
if (IS_ERR(sdev))
return PTR_ERR(sdev);
dev = &sdev->dev;
ret = drm_dev_register(dev, 0);
if (ret)
return ret;
color_mode = drm_format_info_bpp(sdev->format, 0);
if (color_mode == 16)
color_mode = sdev->format->depth; // can be 15 or 16
drm_fbdev_generic_setup(dev, color_mode);
return 0;
}
static void simpledrm_remove(struct platform_device *pdev)
{
struct simpledrm_device *sdev = platform_get_drvdata(pdev);
struct drm_device *dev = &sdev->dev;
drm_dev_unplug(dev);
}
static const struct of_device_id simpledrm_of_match_table[] = {
{ .compatible = "simple-framebuffer", },
{ },
};
MODULE_DEVICE_TABLE(of, simpledrm_of_match_table);
static struct platform_driver simpledrm_platform_driver = {
.driver = {
.name = "simple-framebuffer", /* connect to sysfb */
.of_match_table = simpledrm_of_match_table,
},
.probe = simpledrm_probe,
.remove_new = simpledrm_remove,
};
module_platform_driver(simpledrm_platform_driver);
MODULE_DESCRIPTION(DRIVER_DESC);
MODULE_LICENSE("GPL v2");
