diff options
Diffstat (limited to 'drivers/gpu/drm/ingenic/ingenic-drm.c')
| -rw-r--r-- | drivers/gpu/drm/ingenic/ingenic-drm.c | 818 |
1 files changed, 818 insertions, 0 deletions
diff --git a/drivers/gpu/drm/ingenic/ingenic-drm.c b/drivers/gpu/drm/ingenic/ingenic-drm.c new file mode 100644 index 000000000000..e9f9e9fb9b17 --- /dev/null +++ b/drivers/gpu/drm/ingenic/ingenic-drm.c @@ -0,0 +1,818 @@ +// SPDX-License-Identifier: GPL-2.0 +// +// Ingenic JZ47xx KMS driver +// +// Copyright (C) 2019, Paul Cercueil <paul@crapouillou.net> + +#include <linux/clk.h> +#include <linux/dma-mapping.h> +#include <linux/module.h> +#include <linux/of_device.h> +#include <linux/platform_device.h> +#include <linux/regmap.h> + +#include <drm/drm_atomic.h> +#include <drm/drm_atomic_helper.h> +#include <drm/drm_crtc.h> +#include <drm/drm_crtc_helper.h> +#include <drm/drm_drv.h> +#include <drm/drm_gem_cma_helper.h> +#include <drm/drm_fb_cma_helper.h> +#include <drm/drm_fb_helper.h> +#include <drm/drm_fourcc.h> +#include <drm/drm_gem_framebuffer_helper.h> +#include <drm/drm_irq.h> +#include <drm/drm_of.h> +#include <drm/drm_panel.h> +#include <drm/drm_plane.h> +#include <drm/drm_plane_helper.h> +#include <drm/drm_probe_helper.h> +#include <drm/drm_vblank.h> + +#define JZ_REG_LCD_CFG 0x00 +#define JZ_REG_LCD_VSYNC 0x04 +#define JZ_REG_LCD_HSYNC 0x08 +#define JZ_REG_LCD_VAT 0x0C +#define JZ_REG_LCD_DAH 0x10 +#define JZ_REG_LCD_DAV 0x14 +#define JZ_REG_LCD_PS 0x18 +#define JZ_REG_LCD_CLS 0x1C +#define JZ_REG_LCD_SPL 0x20 +#define JZ_REG_LCD_REV 0x24 +#define JZ_REG_LCD_CTRL 0x30 +#define JZ_REG_LCD_STATE 0x34 +#define JZ_REG_LCD_IID 0x38 +#define JZ_REG_LCD_DA0 0x40 +#define JZ_REG_LCD_SA0 0x44 +#define JZ_REG_LCD_FID0 0x48 +#define JZ_REG_LCD_CMD0 0x4C +#define JZ_REG_LCD_DA1 0x50 +#define JZ_REG_LCD_SA1 0x54 +#define JZ_REG_LCD_FID1 0x58 +#define JZ_REG_LCD_CMD1 0x5C + +#define JZ_LCD_CFG_SLCD BIT(31) +#define JZ_LCD_CFG_PS_DISABLE BIT(23) +#define JZ_LCD_CFG_CLS_DISABLE BIT(22) +#define JZ_LCD_CFG_SPL_DISABLE BIT(21) +#define JZ_LCD_CFG_REV_DISABLE BIT(20) +#define JZ_LCD_CFG_HSYNCM BIT(19) +#define JZ_LCD_CFG_PCLKM BIT(18) +#define JZ_LCD_CFG_INV BIT(17) +#define JZ_LCD_CFG_SYNC_DIR BIT(16) +#define JZ_LCD_CFG_PS_POLARITY BIT(15) +#define JZ_LCD_CFG_CLS_POLARITY BIT(14) +#define JZ_LCD_CFG_SPL_POLARITY BIT(13) +#define JZ_LCD_CFG_REV_POLARITY BIT(12) +#define JZ_LCD_CFG_HSYNC_ACTIVE_LOW BIT(11) +#define JZ_LCD_CFG_PCLK_FALLING_EDGE BIT(10) +#define JZ_LCD_CFG_DE_ACTIVE_LOW BIT(9) +#define JZ_LCD_CFG_VSYNC_ACTIVE_LOW BIT(8) +#define JZ_LCD_CFG_18_BIT BIT(7) +#define JZ_LCD_CFG_PDW (BIT(5) | BIT(4)) + +#define JZ_LCD_CFG_MODE_GENERIC_16BIT 0 +#define JZ_LCD_CFG_MODE_GENERIC_18BIT BIT(7) +#define JZ_LCD_CFG_MODE_GENERIC_24BIT BIT(6) + +#define JZ_LCD_CFG_MODE_SPECIAL_TFT_1 1 +#define JZ_LCD_CFG_MODE_SPECIAL_TFT_2 2 +#define JZ_LCD_CFG_MODE_SPECIAL_TFT_3 3 + +#define JZ_LCD_CFG_MODE_TV_OUT_P 4 +#define JZ_LCD_CFG_MODE_TV_OUT_I 6 + +#define JZ_LCD_CFG_MODE_SINGLE_COLOR_STN 8 +#define JZ_LCD_CFG_MODE_SINGLE_MONOCHROME_STN 9 +#define JZ_LCD_CFG_MODE_DUAL_COLOR_STN 10 +#define JZ_LCD_CFG_MODE_DUAL_MONOCHROME_STN 11 + +#define JZ_LCD_CFG_MODE_8BIT_SERIAL 12 +#define JZ_LCD_CFG_MODE_LCM 13 + +#define JZ_LCD_VSYNC_VPS_OFFSET 16 +#define JZ_LCD_VSYNC_VPE_OFFSET 0 + +#define JZ_LCD_HSYNC_HPS_OFFSET 16 +#define JZ_LCD_HSYNC_HPE_OFFSET 0 + +#define JZ_LCD_VAT_HT_OFFSET 16 +#define JZ_LCD_VAT_VT_OFFSET 0 + +#define JZ_LCD_DAH_HDS_OFFSET 16 +#define JZ_LCD_DAH_HDE_OFFSET 0 + +#define JZ_LCD_DAV_VDS_OFFSET 16 +#define JZ_LCD_DAV_VDE_OFFSET 0 + +#define JZ_LCD_CTRL_BURST_4 (0x0 << 28) +#define JZ_LCD_CTRL_BURST_8 (0x1 << 28) +#define JZ_LCD_CTRL_BURST_16 (0x2 << 28) +#define JZ_LCD_CTRL_RGB555 BIT(27) +#define JZ_LCD_CTRL_OFUP BIT(26) +#define JZ_LCD_CTRL_FRC_GRAYSCALE_16 (0x0 << 24) +#define JZ_LCD_CTRL_FRC_GRAYSCALE_4 (0x1 << 24) +#define JZ_LCD_CTRL_FRC_GRAYSCALE_2 (0x2 << 24) +#define JZ_LCD_CTRL_PDD_MASK (0xff << 16) +#define JZ_LCD_CTRL_EOF_IRQ BIT(13) +#define JZ_LCD_CTRL_SOF_IRQ BIT(12) +#define JZ_LCD_CTRL_OFU_IRQ BIT(11) +#define JZ_LCD_CTRL_IFU0_IRQ BIT(10) +#define JZ_LCD_CTRL_IFU1_IRQ BIT(9) +#define JZ_LCD_CTRL_DD_IRQ BIT(8) +#define JZ_LCD_CTRL_QDD_IRQ BIT(7) +#define JZ_LCD_CTRL_REVERSE_ENDIAN BIT(6) +#define JZ_LCD_CTRL_LSB_FISRT BIT(5) +#define JZ_LCD_CTRL_DISABLE BIT(4) +#define JZ_LCD_CTRL_ENABLE BIT(3) +#define JZ_LCD_CTRL_BPP_1 0x0 +#define JZ_LCD_CTRL_BPP_2 0x1 +#define JZ_LCD_CTRL_BPP_4 0x2 +#define JZ_LCD_CTRL_BPP_8 0x3 +#define JZ_LCD_CTRL_BPP_15_16 0x4 +#define JZ_LCD_CTRL_BPP_18_24 0x5 +#define JZ_LCD_CTRL_BPP_MASK (JZ_LCD_CTRL_RGB555 | (0x7 << 0)) + +#define JZ_LCD_CMD_SOF_IRQ BIT(31) +#define JZ_LCD_CMD_EOF_IRQ BIT(30) +#define JZ_LCD_CMD_ENABLE_PAL BIT(28) + +#define JZ_LCD_SYNC_MASK 0x3ff + +#define JZ_LCD_STATE_EOF_IRQ BIT(5) +#define JZ_LCD_STATE_SOF_IRQ BIT(4) +#define JZ_LCD_STATE_DISABLED BIT(0) + +struct ingenic_dma_hwdesc { + u32 next; + u32 addr; + u32 id; + u32 cmd; +} __packed; + +struct jz_soc_info { + bool needs_dev_clk; +}; + +struct ingenic_drm { + struct drm_device drm; + struct drm_plane primary; + struct drm_crtc crtc; + struct drm_encoder encoder; + + struct device *dev; + struct regmap *map; + struct clk *lcd_clk, *pix_clk; + + struct ingenic_dma_hwdesc *dma_hwdesc; + dma_addr_t dma_hwdesc_phys; +}; + +static const u32 ingenic_drm_primary_formats[] = { + DRM_FORMAT_XRGB1555, + DRM_FORMAT_RGB565, + DRM_FORMAT_XRGB8888, +}; + +static bool ingenic_drm_writeable_reg(struct device *dev, unsigned int reg) +{ + switch (reg) { + case JZ_REG_LCD_IID: + case JZ_REG_LCD_SA0: + case JZ_REG_LCD_FID0: + case JZ_REG_LCD_CMD0: + case JZ_REG_LCD_SA1: + case JZ_REG_LCD_FID1: + case JZ_REG_LCD_CMD1: + return false; + default: + return true; + } +} + +static const struct regmap_config ingenic_drm_regmap_config = { + .reg_bits = 32, + .val_bits = 32, + .reg_stride = 4, + + .max_register = JZ_REG_LCD_CMD1, + .writeable_reg = ingenic_drm_writeable_reg, +}; + +static inline struct ingenic_drm *drm_device_get_priv(struct drm_device *drm) +{ + return container_of(drm, struct ingenic_drm, drm); +} + +static inline struct ingenic_drm *drm_crtc_get_priv(struct drm_crtc *crtc) +{ + return container_of(crtc, struct ingenic_drm, crtc); +} + +static inline struct ingenic_drm * +drm_encoder_get_priv(struct drm_encoder *encoder) +{ + return container_of(encoder, struct ingenic_drm, encoder); +} + +static inline struct ingenic_drm *drm_plane_get_priv(struct drm_plane *plane) +{ + return container_of(plane, struct ingenic_drm, primary); +} + +static void ingenic_drm_crtc_atomic_enable(struct drm_crtc *crtc, + struct drm_crtc_state *state) +{ + struct ingenic_drm *priv = drm_crtc_get_priv(crtc); + + regmap_write(priv->map, JZ_REG_LCD_STATE, 0); + + regmap_update_bits(priv->map, JZ_REG_LCD_CTRL, + JZ_LCD_CTRL_ENABLE | JZ_LCD_CTRL_DISABLE, + JZ_LCD_CTRL_ENABLE); + + drm_crtc_vblank_on(crtc); +} + +static void ingenic_drm_crtc_atomic_disable(struct drm_crtc *crtc, + struct drm_crtc_state *state) +{ + struct ingenic_drm *priv = drm_crtc_get_priv(crtc); + unsigned int var; + + drm_crtc_vblank_off(crtc); + + regmap_update_bits(priv->map, JZ_REG_LCD_CTRL, + JZ_LCD_CTRL_DISABLE, JZ_LCD_CTRL_DISABLE); + + regmap_read_poll_timeout(priv->map, JZ_REG_LCD_STATE, var, + var & JZ_LCD_STATE_DISABLED, + 1000, 0); +} + +static void ingenic_drm_crtc_update_timings(struct ingenic_drm *priv, + struct drm_display_mode *mode) +{ + unsigned int vpe, vds, vde, vt, hpe, hds, hde, ht; + + vpe = mode->vsync_end - mode->vsync_start; + vds = mode->vtotal - mode->vsync_start; + vde = vds + mode->vdisplay; + vt = vde + mode->vsync_start - mode->vdisplay; + + hpe = mode->hsync_end - mode->hsync_start; + hds = mode->htotal - mode->hsync_start; + hde = hds + mode->hdisplay; + ht = hde + mode->hsync_start - mode->hdisplay; + + regmap_write(priv->map, JZ_REG_LCD_VSYNC, + 0 << JZ_LCD_VSYNC_VPS_OFFSET | + vpe << JZ_LCD_VSYNC_VPE_OFFSET); + + regmap_write(priv->map, JZ_REG_LCD_HSYNC, + 0 << JZ_LCD_HSYNC_HPS_OFFSET | + hpe << JZ_LCD_HSYNC_HPE_OFFSET); + + regmap_write(priv->map, JZ_REG_LCD_VAT, + ht << JZ_LCD_VAT_HT_OFFSET | + vt << JZ_LCD_VAT_VT_OFFSET); + + regmap_write(priv->map, JZ_REG_LCD_DAH, + hds << JZ_LCD_DAH_HDS_OFFSET | + hde << JZ_LCD_DAH_HDE_OFFSET); + regmap_write(priv->map, JZ_REG_LCD_DAV, + vds << JZ_LCD_DAV_VDS_OFFSET | + vde << JZ_LCD_DAV_VDE_OFFSET); +} + +static void ingenic_drm_crtc_update_ctrl(struct ingenic_drm *priv, + const struct drm_format_info *finfo) +{ + unsigned int ctrl = JZ_LCD_CTRL_OFUP | JZ_LCD_CTRL_BURST_16; + + switch (finfo->format) { + case DRM_FORMAT_XRGB1555: + ctrl |= JZ_LCD_CTRL_RGB555; + /* fall-through */ + case DRM_FORMAT_RGB565: + ctrl |= JZ_LCD_CTRL_BPP_15_16; + break; + case DRM_FORMAT_XRGB8888: + ctrl |= JZ_LCD_CTRL_BPP_18_24; + break; + } + + regmap_update_bits(priv->map, JZ_REG_LCD_CTRL, + JZ_LCD_CTRL_OFUP | JZ_LCD_CTRL_BURST_16 | + JZ_LCD_CTRL_BPP_MASK, ctrl); +} + +static int ingenic_drm_crtc_atomic_check(struct drm_crtc *crtc, + struct drm_crtc_state *state) +{ + struct ingenic_drm *priv = drm_crtc_get_priv(crtc); + long rate; + + if (!drm_atomic_crtc_needs_modeset(state)) + return 0; + + rate = clk_round_rate(priv->pix_clk, + state->adjusted_mode.clock * 1000); + if (rate < 0) + return rate; + + return 0; +} + +static void ingenic_drm_crtc_atomic_flush(struct drm_crtc *crtc, + struct drm_crtc_state *oldstate) +{ + struct ingenic_drm *priv = drm_crtc_get_priv(crtc); + struct drm_crtc_state *state = crtc->state; + struct drm_pending_vblank_event *event = state->event; + struct drm_framebuffer *drm_fb = crtc->primary->state->fb; + const struct drm_format_info *finfo; + + if (drm_atomic_crtc_needs_modeset(state)) { + finfo = drm_format_info(drm_fb->format->format); + + ingenic_drm_crtc_update_timings(priv, &state->mode); + ingenic_drm_crtc_update_ctrl(priv, finfo); + + clk_set_rate(priv->pix_clk, state->adjusted_mode.clock * 1000); + + regmap_write(priv->map, JZ_REG_LCD_DA0, priv->dma_hwdesc->next); + } + + if (event) { + state->event = NULL; + + spin_lock_irq(&crtc->dev->event_lock); + if (drm_crtc_vblank_get(crtc) == 0) + drm_crtc_arm_vblank_event(crtc, event); + else + drm_crtc_send_vblank_event(crtc, event); + spin_unlock_irq(&crtc->dev->event_lock); + } +} + +static void ingenic_drm_plane_atomic_update(struct drm_plane *plane, + struct drm_plane_state *oldstate) +{ + struct ingenic_drm *priv = drm_plane_get_priv(plane); + struct drm_plane_state *state = plane->state; + unsigned int width, height, cpp; + + width = state->crtc->state->adjusted_mode.hdisplay; + height = state->crtc->state->adjusted_mode.vdisplay; + cpp = state->fb->format->cpp[plane->index]; + + priv->dma_hwdesc->addr = drm_fb_cma_get_gem_addr(state->fb, state, 0); + priv->dma_hwdesc->cmd = width * height * cpp / 4; + priv->dma_hwdesc->cmd |= JZ_LCD_CMD_EOF_IRQ; +} + +static void ingenic_drm_encoder_atomic_mode_set(struct drm_encoder *encoder, + struct drm_crtc_state *crtc_state, + struct drm_connector_state *conn_state) +{ + struct ingenic_drm *priv = drm_encoder_get_priv(encoder); + struct drm_display_mode *mode = &crtc_state->adjusted_mode; + struct drm_display_info *info = &conn_state->connector->display_info; + unsigned int cfg = JZ_LCD_CFG_PS_DISABLE + | JZ_LCD_CFG_CLS_DISABLE + | JZ_LCD_CFG_SPL_DISABLE + | JZ_LCD_CFG_REV_DISABLE; + + if (mode->flags & DRM_MODE_FLAG_NHSYNC) + cfg |= JZ_LCD_CFG_HSYNC_ACTIVE_LOW; + if (mode->flags & DRM_MODE_FLAG_NVSYNC) + cfg |= JZ_LCD_CFG_VSYNC_ACTIVE_LOW; + if (info->bus_flags & DRM_BUS_FLAG_DE_LOW) + cfg |= JZ_LCD_CFG_DE_ACTIVE_LOW; + if (info->bus_flags & DRM_BUS_FLAG_PIXDATA_NEGEDGE) + cfg |= JZ_LCD_CFG_PCLK_FALLING_EDGE; + + if (conn_state->connector->connector_type == DRM_MODE_CONNECTOR_TV) { + if (mode->flags & DRM_MODE_FLAG_INTERLACE) + cfg |= JZ_LCD_CFG_MODE_TV_OUT_I; + else + cfg |= JZ_LCD_CFG_MODE_TV_OUT_P; + } else { + switch (*info->bus_formats) { + case MEDIA_BUS_FMT_RGB565_1X16: + cfg |= JZ_LCD_CFG_MODE_GENERIC_16BIT; + break; + case MEDIA_BUS_FMT_RGB666_1X18: + cfg |= JZ_LCD_CFG_MODE_GENERIC_18BIT; + break; + case MEDIA_BUS_FMT_RGB888_1X24: + cfg |= JZ_LCD_CFG_MODE_GENERIC_24BIT; + break; + default: + break; + } + } + + regmap_write(priv->map, JZ_REG_LCD_CFG, cfg); +} + +static int ingenic_drm_encoder_atomic_check(struct drm_encoder *encoder, + struct drm_crtc_state *crtc_state, + struct drm_connector_state *conn_state) +{ + struct drm_display_info *info = &conn_state->connector->display_info; + + if (info->num_bus_formats != 1) + return -EINVAL; + + if (conn_state->connector->connector_type == DRM_MODE_CONNECTOR_TV) + return 0; + + switch (*info->bus_formats) { + case MEDIA_BUS_FMT_RGB565_1X16: + case MEDIA_BUS_FMT_RGB666_1X18: + case MEDIA_BUS_FMT_RGB888_1X24: + return 0; + default: + return -EINVAL; + } +} + +static irqreturn_t ingenic_drm_irq_handler(int irq, void *arg) +{ + struct ingenic_drm *priv = arg; + unsigned int state; + + regmap_read(priv->map, JZ_REG_LCD_STATE, &state); + + regmap_update_bits(priv->map, JZ_REG_LCD_STATE, + JZ_LCD_STATE_EOF_IRQ, 0); + + if (state & JZ_LCD_STATE_EOF_IRQ) + drm_crtc_handle_vblank(&priv->crtc); + + return IRQ_HANDLED; +} + +static void ingenic_drm_release(struct drm_device *drm) +{ + struct ingenic_drm *priv = drm_device_get_priv(drm); + + drm_mode_config_cleanup(drm); + drm_dev_fini(drm); + kfree(priv); +} + +static int ingenic_drm_enable_vblank(struct drm_crtc *crtc) +{ + struct ingenic_drm *priv = drm_crtc_get_priv(crtc); + + regmap_update_bits(priv->map, JZ_REG_LCD_CTRL, + JZ_LCD_CTRL_EOF_IRQ, JZ_LCD_CTRL_EOF_IRQ); + + return 0; +} + +static void ingenic_drm_disable_vblank(struct drm_crtc *crtc) +{ + struct ingenic_drm *priv = drm_crtc_get_priv(crtc); + + regmap_update_bits(priv->map, JZ_REG_LCD_CTRL, JZ_LCD_CTRL_EOF_IRQ, 0); +} + +DEFINE_DRM_GEM_CMA_FOPS(ingenic_drm_fops); + +static struct drm_driver ingenic_drm_driver_data = { + .driver_features = DRIVER_MODESET | DRIVER_GEM | DRIVER_PRIME + | DRIVER_ATOMIC, + .name = "ingenic-drm", + .desc = "DRM module for Ingenic SoCs", + .date = "20190422", + .major = 1, + .minor = 0, + .patchlevel = 0, + + .fops = &ingenic_drm_fops, + + .dumb_create = drm_gem_cma_dumb_create, + .gem_free_object_unlocked = drm_gem_cma_free_object, + .gem_vm_ops = &drm_gem_cma_vm_ops, + + .prime_handle_to_fd = drm_gem_prime_handle_to_fd, + .prime_fd_to_handle = drm_gem_prime_fd_to_handle, + .gem_prime_get_sg_table = drm_gem_cma_prime_get_sg_table, + .gem_prime_import_sg_table = drm_gem_cma_prime_import_sg_table, + .gem_prime_vmap = drm_gem_cma_prime_vmap, + .gem_prime_vunmap = drm_gem_cma_prime_vunmap, + .gem_prime_mmap = drm_gem_cma_prime_mmap, + + .irq_handler = ingenic_drm_irq_handler, + .release = ingenic_drm_release, +}; + +static const struct drm_plane_funcs ingenic_drm_primary_plane_funcs = { + .update_plane = drm_atomic_helper_update_plane, + .disable_plane = drm_atomic_helper_disable_plane, + .reset = drm_atomic_helper_plane_reset, + .destroy = drm_plane_cleanup, + + .atomic_duplicate_state = drm_atomic_helper_plane_duplicate_state, + .atomic_destroy_state = drm_atomic_helper_plane_destroy_state, +}; + +static const struct drm_crtc_funcs ingenic_drm_crtc_funcs = { + .set_config = drm_atomic_helper_set_config, + .page_flip = drm_atomic_helper_page_flip, + .reset = drm_atomic_helper_crtc_reset, + .destroy = drm_crtc_cleanup, + + .atomic_duplicate_state = drm_atomic_helper_crtc_duplicate_state, + .atomic_destroy_state = drm_atomic_helper_crtc_destroy_state, + + .enable_vblank = ingenic_drm_enable_vblank, + .disable_vblank = ingenic_drm_disable_vblank, + + .gamma_set = drm_atomic_helper_legacy_gamma_set, +}; + +static const struct drm_plane_helper_funcs ingenic_drm_plane_helper_funcs = { + .atomic_update = ingenic_drm_plane_atomic_update, + .prepare_fb = drm_gem_fb_prepare_fb, +}; + +static const struct drm_crtc_helper_funcs ingenic_drm_crtc_helper_funcs = { + .atomic_enable = ingenic_drm_crtc_atomic_enable, + .atomic_disable = ingenic_drm_crtc_atomic_disable, + .atomic_flush = ingenic_drm_crtc_atomic_flush, + .atomic_check = ingenic_drm_crtc_atomic_check, +}; + +static const struct drm_encoder_helper_funcs ingenic_drm_encoder_helper_funcs = { + .atomic_mode_set = ingenic_drm_encoder_atomic_mode_set, + .atomic_check = ingenic_drm_encoder_atomic_check, +}; + +static const struct drm_mode_config_funcs ingenic_drm_mode_config_funcs = { + .fb_create = drm_gem_fb_create, + .output_poll_changed = drm_fb_helper_output_poll_changed, + .atomic_check = drm_atomic_helper_check, + .atomic_commit = drm_atomic_helper_commit, +}; + +static const struct drm_encoder_funcs ingenic_drm_encoder_funcs = { + .destroy = drm_encoder_cleanup, +}; + +static void ingenic_drm_free_dma_hwdesc(void *d) +{ + struct ingenic_drm *priv = d; + + dma_free_coherent(priv->dev, sizeof(*priv->dma_hwdesc), + priv->dma_hwdesc, priv->dma_hwdesc_phys); +} + +static int ingenic_drm_probe(struct platform_device *pdev) +{ + const struct jz_soc_info *soc_info; + struct device *dev = &pdev->dev; + struct ingenic_drm *priv; + struct clk *parent_clk; + struct drm_bridge *bridge; + struct drm_panel *panel; + struct drm_device *drm; + struct resource *mem; + void __iomem *base; + long parent_rate; + int ret, irq; + + soc_info = of_device_get_match_data(dev); + if (!soc_info) { + dev_err(dev, "Missing platform data\n"); + return -EINVAL; + } + + priv = kzalloc(sizeof(*priv), GFP_KERNEL); + if (!priv) + return -ENOMEM; + + priv->dev = dev; + drm = &priv->drm; + drm->dev_private = priv; + + platform_set_drvdata(pdev, priv); + + ret = devm_drm_dev_init(dev, drm, &ingenic_drm_driver_data); + if (ret) { + kfree(priv); + return ret; + } + + drm_mode_config_init(drm); + drm->mode_config.min_width = 0; + drm->mode_config.min_height = 0; + drm->mode_config.max_width = 800; + drm->mode_config.max_height = 600; + drm->mode_config.funcs = &ingenic_drm_mode_config_funcs; + + mem = platform_get_resource(pdev, IORESOURCE_MEM, 0); + base = devm_ioremap_resource(dev, mem); + if (IS_ERR(base)) { + dev_err(dev, "Failed to get memory resource"); + return PTR_ERR(base); + } + + priv->map = devm_regmap_init_mmio(dev, base, + &ingenic_drm_regmap_config); + if (IS_ERR(priv->map)) { + dev_err(dev, "Failed to create regmap"); + return PTR_ERR(priv->map); + } + + irq = platform_get_irq(pdev, 0); + if (irq < 0) { + dev_err(dev, "Failed to get platform irq"); + return irq; + } + + if (soc_info->needs_dev_clk) { + priv->lcd_clk = devm_clk_get(dev, "lcd"); + if (IS_ERR(priv->lcd_clk)) { + dev_err(dev, "Failed to get lcd clock"); + return PTR_ERR(priv->lcd_clk); + } + } + + priv->pix_clk = devm_clk_get(dev, "lcd_pclk"); + if (IS_ERR(priv->pix_clk)) { + dev_err(dev, "Failed to get pixel clock"); + return PTR_ERR(priv->pix_clk); + } + + ret = drm_of_find_panel_or_bridge(dev->of_node, 0, 0, &panel, &bridge); + if (ret) { + if (ret != -EPROBE_DEFER) + dev_err(dev, "Failed to get panel handle"); + return ret; + } + + if (panel) { + bridge = devm_drm_panel_bridge_add(dev, panel, + DRM_MODE_CONNECTOR_Unknown); + } + + priv->dma_hwdesc = dma_alloc_coherent(dev, sizeof(*priv->dma_hwdesc), + &priv->dma_hwdesc_phys, + GFP_KERNEL); + if (!priv->dma_hwdesc) + return -ENOMEM; + + ret = devm_add_action_or_reset(dev, ingenic_drm_free_dma_hwdesc, priv); + if (ret) + return ret; + + priv->dma_hwdesc->next = priv->dma_hwdesc_phys; + priv->dma_hwdesc->id = 0xdeafbead; + + drm_plane_helper_add(&priv->primary, &ingenic_drm_plane_helper_funcs); + + ret = drm_universal_plane_init(drm, &priv->primary, + 0, &ingenic_drm_primary_plane_funcs, + ingenic_drm_primary_formats, + ARRAY_SIZE(ingenic_drm_primary_formats), + NULL, DRM_PLANE_TYPE_PRIMARY, NULL); + if (ret) { + dev_err(dev, "Failed to register primary plane: %i", ret); + return ret; + } + + drm_crtc_helper_add(&priv->crtc, &ingenic_drm_crtc_helper_funcs); + + ret = drm_crtc_init_with_planes(drm, &priv->crtc, &priv->primary, + NULL, &ingenic_drm_crtc_funcs, NULL); + if (ret) { + dev_err(dev, "Failed to init CRTC: %i", ret); + return ret; + } + + priv->encoder.possible_crtcs = 1; + + drm_encoder_helper_add(&priv->encoder, + &ingenic_drm_encoder_helper_funcs); + + ret = drm_encoder_init(drm, &priv->encoder, &ingenic_drm_encoder_funcs, + DRM_MODE_ENCODER_DPI, NULL); + if (ret) { + dev_err(dev, "Failed to init encoder: %i", ret); + return ret; + } + + ret = drm_bridge_attach(&priv->encoder, bridge, NULL); + if (ret) { + dev_err(dev, "Unable to attach bridge"); + return ret; + } + + ret = drm_irq_install(drm, irq); + if (ret) { + dev_err(dev, "Unable to install IRQ handler"); + return ret; + } + + ret = drm_vblank_init(drm, 1); + if (ret) { + dev_err(dev, "Failed calling drm_vblank_init()"); + return ret; + } + + drm_mode_config_reset(drm); + + ret = clk_prepare_enable(priv->pix_clk); + if (ret) { + dev_err(dev, "Unable to start pixel clock"); + return ret; + } + + if (priv->lcd_clk) { + parent_clk = clk_get_parent(priv->lcd_clk); + parent_rate = clk_get_rate(parent_clk); + + /* LCD Device clock must be 3x the pixel clock for STN panels, + * or 1.5x the pixel clock for TFT panels. To avoid having to + * check for the LCD device clock everytime we do a mode change, + * we set the LCD device clock to the highest rate possible. + */ + ret = clk_set_rate(priv->lcd_clk, parent_rate); + if (ret) { + dev_err(dev, "Unable to set LCD clock rate"); + goto err_pixclk_disable; + } + + ret = clk_prepare_enable(priv->lcd_clk); + if (ret) { + dev_err(dev, "Unable to start lcd clock"); + goto err_pixclk_disable; + } + } + + ret = drm_dev_register(drm, 0); + if (ret) { + dev_err(dev, "Failed to register DRM driver"); + goto err_devclk_disable; + } + + ret = drm_fbdev_generic_setup(drm, 32); + if (ret) + dev_warn(dev, "Unable to start fbdev emulation: %i", ret); + + return 0; + +err_devclk_disable: + if (priv->lcd_clk) + clk_disable_unprepare(priv->lcd_clk); +err_pixclk_disable: + clk_disable_unprepare(priv->pix_clk); + return ret; +} + +static int ingenic_drm_remove(struct platform_device *pdev) +{ + struct ingenic_drm *priv = platform_get_drvdata(pdev); + + if (priv->lcd_clk) + clk_disable_unprepare(priv->lcd_clk); + clk_disable_unprepare(priv->pix_clk); + + drm_dev_unregister(&priv->drm); + drm_atomic_helper_shutdown(&priv->drm); + + return 0; +} + +static const struct jz_soc_info jz4740_soc_info = { + .needs_dev_clk = true, +}; + +static const struct jz_soc_info jz4725b_soc_info = { + .needs_dev_clk = false, +}; + +static const struct of_device_id ingenic_drm_of_match[] = { + { .compatible = "ingenic,jz4740-lcd", .data = &jz4740_soc_info }, + { .compatible = "ingenic,jz4725b-lcd", .data = &jz4725b_soc_info }, + { /* sentinel */ }, +}; + +static struct platform_driver ingenic_drm_driver = { + .driver = { + .name = "ingenic-drm", + .of_match_table = of_match_ptr(ingenic_drm_of_match), + }, + .probe = ingenic_drm_probe, + .remove = ingenic_drm_remove, +}; +module_platform_driver(ingenic_drm_driver); + +MODULE_AUTHOR("Paul Cercueil <paul@crapouillou.net>"); +MODULE_DESCRIPTION("DRM driver for the Ingenic SoCs\n"); +MODULE_LICENSE("GPL v2"); |