diff options
Diffstat (limited to 'drivers/gpu/drm/tiny/simpledrm.c')
| -rw-r--r-- | drivers/gpu/drm/tiny/simpledrm.c | 901 |
1 files changed, 901 insertions, 0 deletions
diff --git a/drivers/gpu/drm/tiny/simpledrm.c b/drivers/gpu/drm/tiny/simpledrm.c new file mode 100644 index 000000000000..08ae66b1e6f5 --- /dev/null +++ b/drivers/gpu/drm/tiny/simpledrm.c @@ -0,0 +1,901 @@ +// SPDX-License-Identifier: GPL-2.0-only + +#include <linux/clk.h> +#include <linux/of_clk.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_state_helper.h> +#include <drm/drm_connector.h> +#include <drm/drm_damage_helper.h> +#include <drm/drm_device.h> +#include <drm/drm_drv.h> +#include <drm/drm_fb_helper.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_probe_helper.h> +#include <drm/drm_simple_kms_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 + +/* + * Assume a monitor resolution of 96 dpi to + * get a somewhat reasonable screen size. + */ +#define RES_MM(d) \ + (((d) * 254ul) / (96ul * 10ul)) + +#define SIMPLEDRM_MODE(hd, vd) \ + DRM_SIMPLE_MODE(hd, vd, RES_MM(hd), RES_MM(vd)) + +/* + * 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); +} + +/* + * Simple Framebuffer device + */ + +struct simpledrm_device { + struct drm_device dev; + struct platform_device *pdev; + + /* 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 resource *mem; + void __iomem *screen_base; + + /* modesetting */ + uint32_t formats[8]; + size_t nformats; + struct drm_connector connector; + struct drm_simple_display_pipe pipe; +}; + +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 = sdev->pdev; + 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 = sdev->pdev; + 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 + +/* + * Simplefb settings + */ + +static struct drm_display_mode simpledrm_mode(unsigned int width, + unsigned int height) +{ + struct drm_display_mode mode = { SIMPLEDRM_MODE(width, height) }; + + mode.clock = 60 /* Hz */ * mode.hdisplay * mode.vdisplay; + drm_mode_set_name(&mode); + + return mode; +} + +static int simpledrm_device_init_fb(struct simpledrm_device *sdev) +{ + int width, height, stride; + const struct drm_format_info *format; + struct drm_device *dev = &sdev->dev; + struct platform_device *pdev = sdev->pdev; + const struct simplefb_platform_data *pd = dev_get_platdata(&pdev->dev); + struct device_node *of_node = pdev->dev.of_node; + + if (pd) { + width = simplefb_get_width_pd(dev, pd); + if (width < 0) + return width; + height = simplefb_get_height_pd(dev, pd); + if (height < 0) + return height; + stride = simplefb_get_stride_pd(dev, pd); + if (stride < 0) + return stride; + format = simplefb_get_format_pd(dev, pd); + if (IS_ERR(format)) + return PTR_ERR(format); + } else if (of_node) { + width = simplefb_get_width_of(dev, of_node); + if (width < 0) + return width; + height = simplefb_get_height_of(dev, of_node); + if (height < 0) + return height; + stride = simplefb_get_stride_of(dev, of_node); + if (stride < 0) + return stride; + format = simplefb_get_format_of(dev, of_node); + if (IS_ERR(format)) + return PTR_ERR(format); + } else { + drm_err(dev, "no simplefb configuration found\n"); + return -ENODEV; + } + + sdev->mode = simpledrm_mode(width, height); + sdev->format = format; + sdev->pitch = stride; + + drm_dbg_kms(dev, "display mode={" DRM_MODE_FMT "}\n", + DRM_MODE_ARG(&sdev->mode)); + drm_dbg_kms(dev, + "framebuffer format=%p4cc, size=%dx%d, stride=%d byte\n", + &format->format, width, height, stride); + + return 0; +} + +/* + * Memory management + */ + +static int simpledrm_device_init_mm(struct simpledrm_device *sdev) +{ + struct drm_device *dev = &sdev->dev; + struct platform_device *pdev = sdev->pdev; + struct resource *mem; + void __iomem *screen_base; + int ret; + + mem = platform_get_resource(pdev, IORESOURCE_MEM, 0); + if (!mem) + return -EINVAL; + + ret = devm_aperture_acquire_from_firmware(dev, mem->start, resource_size(mem)); + if (ret) { + drm_err(dev, "could not acquire memory range %pr: error %d\n", + mem, ret); + return ret; + } + + screen_base = devm_ioremap_wc(&pdev->dev, mem->start, + resource_size(mem)); + if (!screen_base) + return -ENOMEM; + + sdev->mem = mem; + sdev->screen_base = screen_base; + + return 0; +} + +/* + * Modesetting + */ + +/* + * Support all formats of simplefb and maybe more; in order + * of preference. The display's update function will do any + * conversion necessary. + * + * TODO: Add blit helpers for remaining formats and uncomment + * constants. + */ +static const uint32_t simpledrm_default_formats[] = { + DRM_FORMAT_XRGB8888, + DRM_FORMAT_ARGB8888, + DRM_FORMAT_RGB565, + //DRM_FORMAT_XRGB1555, + //DRM_FORMAT_ARGB1555, + DRM_FORMAT_RGB888, + //DRM_FORMAT_XRGB2101010, + //DRM_FORMAT_ARGB2101010, +}; + +static const uint64_t simpledrm_format_modifiers[] = { + DRM_FORMAT_MOD_LINEAR, + DRM_FORMAT_MOD_INVALID +}; + +static int simpledrm_connector_helper_get_modes(struct drm_connector *connector) +{ + struct simpledrm_device *sdev = simpledrm_device_of_dev(connector->dev); + struct drm_display_mode *mode; + + mode = drm_mode_duplicate(connector->dev, &sdev->mode); + if (!mode) + return 0; + + if (mode->name[0] == '\0') + drm_mode_set_name(mode); + + mode->type |= DRM_MODE_TYPE_PREFERRED; + drm_mode_probed_add(connector, mode); + + if (mode->width_mm) + connector->display_info.width_mm = mode->width_mm; + if (mode->height_mm) + connector->display_info.height_mm = mode->height_mm; + + return 1; +} + +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 int +simpledrm_simple_display_pipe_mode_valid(struct drm_simple_display_pipe *pipe, + const struct drm_display_mode *mode) +{ + struct simpledrm_device *sdev = simpledrm_device_of_dev(pipe->crtc.dev); + + if (mode->hdisplay != sdev->mode.hdisplay && + mode->vdisplay != sdev->mode.vdisplay) + return MODE_ONE_SIZE; + else if (mode->hdisplay != sdev->mode.hdisplay) + return MODE_ONE_WIDTH; + else if (mode->vdisplay != sdev->mode.vdisplay) + return MODE_ONE_HEIGHT; + + return MODE_OK; +} + +static void +simpledrm_simple_display_pipe_enable(struct drm_simple_display_pipe *pipe, + struct drm_crtc_state *crtc_state, + struct drm_plane_state *plane_state) +{ + struct simpledrm_device *sdev = simpledrm_device_of_dev(pipe->crtc.dev); + struct drm_shadow_plane_state *shadow_plane_state = to_drm_shadow_plane_state(plane_state); + struct drm_framebuffer *fb = plane_state->fb; + void *vmap = shadow_plane_state->map[0].vaddr; /* TODO: Use mapping abstraction properly */ + struct drm_device *dev = &sdev->dev; + int idx; + + if (!fb) + return; + + if (!drm_dev_enter(dev, &idx)) + return; + + drm_fb_blit_dstclip(sdev->screen_base, sdev->pitch, + sdev->format->format, vmap, fb); + drm_dev_exit(idx); +} + +static void +simpledrm_simple_display_pipe_disable(struct drm_simple_display_pipe *pipe) +{ + struct simpledrm_device *sdev = simpledrm_device_of_dev(pipe->crtc.dev); + struct drm_device *dev = &sdev->dev; + int idx; + + if (!drm_dev_enter(dev, &idx)) + return; + + /* Clear screen to black if disabled */ + memset_io(sdev->screen_base, 0, sdev->pitch * sdev->mode.vdisplay); + + drm_dev_exit(idx); +} + +static void +simpledrm_simple_display_pipe_update(struct drm_simple_display_pipe *pipe, + struct drm_plane_state *old_plane_state) +{ + struct simpledrm_device *sdev = simpledrm_device_of_dev(pipe->crtc.dev); + struct drm_plane_state *plane_state = pipe->plane.state; + struct drm_shadow_plane_state *shadow_plane_state = to_drm_shadow_plane_state(plane_state); + void *vmap = shadow_plane_state->map[0].vaddr; /* TODO: Use mapping abstraction properly */ + struct drm_framebuffer *fb = plane_state->fb; + struct drm_device *dev = &sdev->dev; + struct drm_rect clip; + int idx; + + if (!fb) + return; + + if (!drm_atomic_helper_damage_merged(old_plane_state, plane_state, &clip)) + return; + + if (!drm_dev_enter(dev, &idx)) + return; + + drm_fb_blit_rect_dstclip(sdev->screen_base, sdev->pitch, + sdev->format->format, vmap, fb, &clip); + + drm_dev_exit(idx); +} + +static const struct drm_simple_display_pipe_funcs +simpledrm_simple_display_pipe_funcs = { + .mode_valid = simpledrm_simple_display_pipe_mode_valid, + .enable = simpledrm_simple_display_pipe_enable, + .disable = simpledrm_simple_display_pipe_disable, + .update = simpledrm_simple_display_pipe_update, + DRM_GEM_SIMPLE_DISPLAY_PIPE_SHADOW_PLANE_FUNCS, +}; + +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, +}; + +static const uint32_t *simpledrm_device_formats(struct simpledrm_device *sdev, + size_t *nformats_out) +{ + struct drm_device *dev = &sdev->dev; + size_t i; + + if (sdev->nformats) + goto out; /* don't rebuild list on recurring calls */ + + /* native format goes first */ + sdev->formats[0] = sdev->format->format; + sdev->nformats = 1; + + /* default formats go second */ + for (i = 0; i < ARRAY_SIZE(simpledrm_default_formats); ++i) { + if (simpledrm_default_formats[i] == sdev->format->format) + continue; /* native format already went first */ + sdev->formats[sdev->nformats] = simpledrm_default_formats[i]; + sdev->nformats++; + } + + /* + * TODO: The simpledrm driver converts framebuffers to the native + * format when copying them to device memory. If there are more + * formats listed than supported by the driver, the native format + * is not supported by the conversion helpers. Therefore *only* + * support the native format and add a conversion helper ASAP. + */ + if (drm_WARN_ONCE(dev, i != sdev->nformats, + "format conversion helpers required for %p4cc", + &sdev->format->format)) { + sdev->nformats = 1; + } + +out: + *nformats_out = sdev->nformats; + return sdev->formats; +} + +static int simpledrm_device_init_modeset(struct simpledrm_device *sdev) +{ + struct drm_device *dev = &sdev->dev; + struct drm_display_mode *mode = &sdev->mode; + struct drm_connector *connector = &sdev->connector; + struct drm_simple_display_pipe *pipe = &sdev->pipe; + const uint32_t *formats; + size_t nformats; + int ret; + + ret = drmm_mode_config_init(dev); + if (ret) + return ret; + + dev->mode_config.min_width = mode->hdisplay; + dev->mode_config.max_width = mode->hdisplay; + dev->mode_config.min_height = mode->vdisplay; + dev->mode_config.max_height = mode->vdisplay; + dev->mode_config.prefer_shadow_fbdev = true; + dev->mode_config.preferred_depth = sdev->format->cpp[0] * 8; + dev->mode_config.funcs = &simpledrm_mode_config_funcs; + + ret = drm_connector_init(dev, connector, &simpledrm_connector_funcs, + DRM_MODE_CONNECTOR_Unknown); + if (ret) + return ret; + drm_connector_helper_add(connector, &simpledrm_connector_helper_funcs); + + formats = simpledrm_device_formats(sdev, &nformats); + + ret = drm_simple_display_pipe_init(dev, pipe, &simpledrm_simple_display_pipe_funcs, + formats, nformats, simpledrm_format_modifiers, + connector); + if (ret) + return ret; + + drm_mode_config_reset(dev); + + return 0; +} + +/* + * Init / Cleanup + */ + +static struct simpledrm_device * +simpledrm_device_create(struct drm_driver *drv, struct platform_device *pdev) +{ + struct simpledrm_device *sdev; + int ret; + + sdev = devm_drm_dev_alloc(&pdev->dev, drv, struct simpledrm_device, + dev); + if (IS_ERR(sdev)) + return ERR_CAST(sdev); + sdev->pdev = pdev; + platform_set_drvdata(pdev, sdev); + + 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_init_fb(sdev); + if (ret) + return ERR_PTR(ret); + ret = simpledrm_device_init_mm(sdev); + if (ret) + return ERR_PTR(ret); + ret = simpledrm_device_init_modeset(sdev); + if (ret) + return ERR_PTR(ret); + + 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; + 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; + + drm_fbdev_generic_setup(dev, 0); + + return 0; +} + +static int simpledrm_remove(struct platform_device *pdev) +{ + struct simpledrm_device *sdev = platform_get_drvdata(pdev); + struct drm_device *dev = &sdev->dev; + + drm_dev_unplug(dev); + + return 0; +} + +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 = simpledrm_remove, +}; + +module_platform_driver(simpledrm_platform_driver); + +MODULE_DESCRIPTION(DRIVER_DESC); +MODULE_LICENSE("GPL v2"); |