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-rw-r--r--drivers/gpu/drm/tiny/simpledrm.c917
1 files changed, 917 insertions, 0 deletions
diff --git a/drivers/gpu/drm/tiny/simpledrm.c b/drivers/gpu/drm/tiny/simpledrm.c
new file mode 100644
index 0000000000..8ea120eb86
--- /dev/null
+++ b/drivers/gpu/drm/tiny/simpledrm.c
@@ -0,0 +1,917 @@
+// 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/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_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_plane_helper.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
+
+ /* 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
+
+/*
+ * Modesetting
+ */
+
+static const uint64_t simpledrm_primary_plane_format_modifiers[] = {
+ DRM_FORMAT_MOD_LINEAR,
+ DRM_FORMAT_MOD_INVALID
+};
+
+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);
+ }
+
+ 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 = drm_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);
+
+ 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");