| /* |
| * Copyright (C) STMicroelectronics SA 2014 |
| * Author: Vincent Abriou <vincent.abriou@st.com> for STMicroelectronics. |
| * License terms: GNU General Public License (GPL), version 2 |
| */ |
| |
| #include <linux/clk.h> |
| #include <linux/component.h> |
| #include <linux/debugfs.h> |
| #include <linux/module.h> |
| #include <linux/of_gpio.h> |
| #include <linux/platform_device.h> |
| |
| #include <drm/drmP.h> |
| #include <drm/drm_atomic_helper.h> |
| #include <drm/drm_crtc_helper.h> |
| #include <drm/drm_panel.h> |
| |
| #include "sti_awg_utils.h" |
| #include "sti_mixer.h" |
| |
| /* DVO registers */ |
| #define DVO_AWG_DIGSYNC_CTRL 0x0000 |
| #define DVO_DOF_CFG 0x0004 |
| #define DVO_LUT_PROG_LOW 0x0008 |
| #define DVO_LUT_PROG_MID 0x000C |
| #define DVO_LUT_PROG_HIGH 0x0010 |
| #define DVO_DIGSYNC_INSTR_I 0x0100 |
| |
| #define DVO_AWG_CTRL_EN BIT(0) |
| #define DVO_AWG_FRAME_BASED_SYNC BIT(2) |
| |
| #define DVO_DOF_EN_LOWBYTE BIT(0) |
| #define DVO_DOF_EN_MIDBYTE BIT(1) |
| #define DVO_DOF_EN_HIGHBYTE BIT(2) |
| #define DVO_DOF_EN BIT(6) |
| #define DVO_DOF_MOD_COUNT_SHIFT 8 |
| |
| #define DVO_LUT_ZERO 0 |
| #define DVO_LUT_Y_G 1 |
| #define DVO_LUT_Y_G_DEL 2 |
| #define DVO_LUT_CB_B 3 |
| #define DVO_LUT_CB_B_DEL 4 |
| #define DVO_LUT_CR_R 5 |
| #define DVO_LUT_CR_R_DEL 6 |
| #define DVO_LUT_HOLD 7 |
| |
| struct dvo_config { |
| u32 flags; |
| u32 lowbyte; |
| u32 midbyte; |
| u32 highbyte; |
| int (*awg_fwgen_fct)( |
| struct awg_code_generation_params *fw_gen_params, |
| struct awg_timing *timing); |
| }; |
| |
| static struct dvo_config rgb_24bit_de_cfg = { |
| .flags = (0L << DVO_DOF_MOD_COUNT_SHIFT), |
| .lowbyte = DVO_LUT_CR_R, |
| .midbyte = DVO_LUT_Y_G, |
| .highbyte = DVO_LUT_CB_B, |
| .awg_fwgen_fct = sti_awg_generate_code_data_enable_mode, |
| }; |
| |
| /** |
| * STI digital video output structure |
| * |
| * @dev: driver device |
| * @drm_dev: pointer to drm device |
| * @mode: current display mode selected |
| * @regs: dvo registers |
| * @clk_pix: pixel clock for dvo |
| * @clk: clock for dvo |
| * @clk_main_parent: dvo parent clock if main path used |
| * @clk_aux_parent: dvo parent clock if aux path used |
| * @panel_node: panel node reference from device tree |
| * @panel: reference to the panel connected to the dvo |
| * @enabled: true if dvo is enabled else false |
| * @encoder: drm_encoder it is bound |
| */ |
| struct sti_dvo { |
| struct device dev; |
| struct drm_device *drm_dev; |
| struct drm_display_mode mode; |
| void __iomem *regs; |
| struct clk *clk_pix; |
| struct clk *clk; |
| struct clk *clk_main_parent; |
| struct clk *clk_aux_parent; |
| struct device_node *panel_node; |
| struct drm_panel *panel; |
| struct dvo_config *config; |
| bool enabled; |
| struct drm_encoder *encoder; |
| struct drm_bridge *bridge; |
| }; |
| |
| struct sti_dvo_connector { |
| struct drm_connector drm_connector; |
| struct drm_encoder *encoder; |
| struct sti_dvo *dvo; |
| }; |
| |
| #define to_sti_dvo_connector(x) \ |
| container_of(x, struct sti_dvo_connector, drm_connector) |
| |
| #define BLANKING_LEVEL 16 |
| int dvo_awg_generate_code(struct sti_dvo *dvo, u8 *ram_size, u32 *ram_code) |
| { |
| struct drm_display_mode *mode = &dvo->mode; |
| struct dvo_config *config = dvo->config; |
| struct awg_code_generation_params fw_gen_params; |
| struct awg_timing timing; |
| |
| fw_gen_params.ram_code = ram_code; |
| fw_gen_params.instruction_offset = 0; |
| |
| timing.total_lines = mode->vtotal; |
| timing.active_lines = mode->vdisplay; |
| timing.blanking_lines = mode->vsync_start - mode->vdisplay; |
| timing.trailing_lines = mode->vtotal - mode->vsync_start; |
| timing.total_pixels = mode->htotal; |
| timing.active_pixels = mode->hdisplay; |
| timing.blanking_pixels = mode->hsync_start - mode->hdisplay; |
| timing.trailing_pixels = mode->htotal - mode->hsync_start; |
| timing.blanking_level = BLANKING_LEVEL; |
| |
| if (config->awg_fwgen_fct(&fw_gen_params, &timing)) { |
| DRM_ERROR("AWG firmware not properly generated\n"); |
| return -EINVAL; |
| } |
| |
| *ram_size = fw_gen_params.instruction_offset; |
| |
| return 0; |
| } |
| |
| /* Configure AWG, writing instructions |
| * |
| * @dvo: pointer to DVO structure |
| * @awg_ram_code: pointer to AWG instructions table |
| * @nb: nb of AWG instructions |
| */ |
| static void dvo_awg_configure(struct sti_dvo *dvo, u32 *awg_ram_code, int nb) |
| { |
| int i; |
| |
| DRM_DEBUG_DRIVER("\n"); |
| |
| for (i = 0; i < nb; i++) |
| writel(awg_ram_code[i], |
| dvo->regs + DVO_DIGSYNC_INSTR_I + i * 4); |
| for (i = nb; i < AWG_MAX_INST; i++) |
| writel(0, dvo->regs + DVO_DIGSYNC_INSTR_I + i * 4); |
| |
| writel(DVO_AWG_CTRL_EN, dvo->regs + DVO_AWG_DIGSYNC_CTRL); |
| } |
| |
| #define DBGFS_DUMP(reg) seq_printf(s, "\n %-25s 0x%08X", #reg, \ |
| readl(dvo->regs + reg)) |
| |
| static void dvo_dbg_awg_microcode(struct seq_file *s, void __iomem *reg) |
| { |
| unsigned int i; |
| |
| seq_puts(s, "\n\n"); |
| seq_puts(s, " DVO AWG microcode:"); |
| for (i = 0; i < AWG_MAX_INST; i++) { |
| if (i % 8 == 0) |
| seq_printf(s, "\n %04X:", i); |
| seq_printf(s, " %04X", readl(reg + i * 4)); |
| } |
| } |
| |
| static int dvo_dbg_show(struct seq_file *s, void *data) |
| { |
| struct drm_info_node *node = s->private; |
| struct sti_dvo *dvo = (struct sti_dvo *)node->info_ent->data; |
| |
| seq_printf(s, "DVO: (vaddr = 0x%p)", dvo->regs); |
| DBGFS_DUMP(DVO_AWG_DIGSYNC_CTRL); |
| DBGFS_DUMP(DVO_DOF_CFG); |
| DBGFS_DUMP(DVO_LUT_PROG_LOW); |
| DBGFS_DUMP(DVO_LUT_PROG_MID); |
| DBGFS_DUMP(DVO_LUT_PROG_HIGH); |
| dvo_dbg_awg_microcode(s, dvo->regs + DVO_DIGSYNC_INSTR_I); |
| seq_puts(s, "\n"); |
| |
| return 0; |
| } |
| |
| static struct drm_info_list dvo_debugfs_files[] = { |
| { "dvo", dvo_dbg_show, 0, NULL }, |
| }; |
| |
| static void dvo_debugfs_exit(struct sti_dvo *dvo, struct drm_minor *minor) |
| { |
| drm_debugfs_remove_files(dvo_debugfs_files, |
| ARRAY_SIZE(dvo_debugfs_files), |
| minor); |
| } |
| |
| static int dvo_debugfs_init(struct sti_dvo *dvo, struct drm_minor *minor) |
| { |
| unsigned int i; |
| |
| for (i = 0; i < ARRAY_SIZE(dvo_debugfs_files); i++) |
| dvo_debugfs_files[i].data = dvo; |
| |
| return drm_debugfs_create_files(dvo_debugfs_files, |
| ARRAY_SIZE(dvo_debugfs_files), |
| minor->debugfs_root, minor); |
| } |
| |
| static void sti_dvo_disable(struct drm_bridge *bridge) |
| { |
| struct sti_dvo *dvo = bridge->driver_private; |
| |
| if (!dvo->enabled) |
| return; |
| |
| DRM_DEBUG_DRIVER("\n"); |
| |
| if (dvo->config->awg_fwgen_fct) |
| writel(0x00000000, dvo->regs + DVO_AWG_DIGSYNC_CTRL); |
| |
| writel(0x00000000, dvo->regs + DVO_DOF_CFG); |
| |
| if (dvo->panel) |
| dvo->panel->funcs->disable(dvo->panel); |
| |
| /* Disable/unprepare dvo clock */ |
| clk_disable_unprepare(dvo->clk_pix); |
| clk_disable_unprepare(dvo->clk); |
| |
| dvo->enabled = false; |
| } |
| |
| static void sti_dvo_pre_enable(struct drm_bridge *bridge) |
| { |
| struct sti_dvo *dvo = bridge->driver_private; |
| struct dvo_config *config = dvo->config; |
| u32 val; |
| |
| DRM_DEBUG_DRIVER("\n"); |
| |
| if (dvo->enabled) |
| return; |
| |
| /* Make sure DVO is disabled */ |
| writel(0x00000000, dvo->regs + DVO_DOF_CFG); |
| writel(0x00000000, dvo->regs + DVO_AWG_DIGSYNC_CTRL); |
| |
| if (config->awg_fwgen_fct) { |
| u8 nb_instr; |
| u32 awg_ram_code[AWG_MAX_INST]; |
| /* Configure AWG */ |
| if (!dvo_awg_generate_code(dvo, &nb_instr, awg_ram_code)) |
| dvo_awg_configure(dvo, awg_ram_code, nb_instr); |
| else |
| return; |
| } |
| |
| /* Prepare/enable clocks */ |
| if (clk_prepare_enable(dvo->clk_pix)) |
| DRM_ERROR("Failed to prepare/enable dvo_pix clk\n"); |
| if (clk_prepare_enable(dvo->clk)) |
| DRM_ERROR("Failed to prepare/enable dvo clk\n"); |
| |
| if (dvo->panel) |
| dvo->panel->funcs->enable(dvo->panel); |
| |
| /* Set LUT */ |
| writel(config->lowbyte, dvo->regs + DVO_LUT_PROG_LOW); |
| writel(config->midbyte, dvo->regs + DVO_LUT_PROG_MID); |
| writel(config->highbyte, dvo->regs + DVO_LUT_PROG_HIGH); |
| |
| /* Digital output formatter config */ |
| val = (config->flags | DVO_DOF_EN); |
| writel(val, dvo->regs + DVO_DOF_CFG); |
| |
| dvo->enabled = true; |
| } |
| |
| static void sti_dvo_set_mode(struct drm_bridge *bridge, |
| struct drm_display_mode *mode, |
| struct drm_display_mode *adjusted_mode) |
| { |
| struct sti_dvo *dvo = bridge->driver_private; |
| struct sti_mixer *mixer = to_sti_mixer(dvo->encoder->crtc); |
| int rate = mode->clock * 1000; |
| struct clk *clkp; |
| int ret; |
| |
| DRM_DEBUG_DRIVER("\n"); |
| |
| memcpy(&dvo->mode, mode, sizeof(struct drm_display_mode)); |
| |
| /* According to the path used (main or aux), the dvo clocks should |
| * have a different parent clock. */ |
| if (mixer->id == STI_MIXER_MAIN) |
| clkp = dvo->clk_main_parent; |
| else |
| clkp = dvo->clk_aux_parent; |
| |
| if (clkp) { |
| clk_set_parent(dvo->clk_pix, clkp); |
| clk_set_parent(dvo->clk, clkp); |
| } |
| |
| /* DVO clocks = compositor clock */ |
| ret = clk_set_rate(dvo->clk_pix, rate); |
| if (ret < 0) { |
| DRM_ERROR("Cannot set rate (%dHz) for dvo_pix clk\n", rate); |
| return; |
| } |
| |
| ret = clk_set_rate(dvo->clk, rate); |
| if (ret < 0) { |
| DRM_ERROR("Cannot set rate (%dHz) for dvo clk\n", rate); |
| return; |
| } |
| |
| /* For now, we only support 24bit data enable (DE) synchro format */ |
| dvo->config = &rgb_24bit_de_cfg; |
| } |
| |
| static void sti_dvo_bridge_nope(struct drm_bridge *bridge) |
| { |
| /* do nothing */ |
| } |
| |
| static const struct drm_bridge_funcs sti_dvo_bridge_funcs = { |
| .pre_enable = sti_dvo_pre_enable, |
| .enable = sti_dvo_bridge_nope, |
| .disable = sti_dvo_disable, |
| .post_disable = sti_dvo_bridge_nope, |
| .mode_set = sti_dvo_set_mode, |
| }; |
| |
| static int sti_dvo_connector_get_modes(struct drm_connector *connector) |
| { |
| struct sti_dvo_connector *dvo_connector |
| = to_sti_dvo_connector(connector); |
| struct sti_dvo *dvo = dvo_connector->dvo; |
| |
| if (dvo->panel) |
| return dvo->panel->funcs->get_modes(dvo->panel); |
| |
| return 0; |
| } |
| |
| #define CLK_TOLERANCE_HZ 50 |
| |
| static int sti_dvo_connector_mode_valid(struct drm_connector *connector, |
| struct drm_display_mode *mode) |
| { |
| int target = mode->clock * 1000; |
| int target_min = target - CLK_TOLERANCE_HZ; |
| int target_max = target + CLK_TOLERANCE_HZ; |
| int result; |
| struct sti_dvo_connector *dvo_connector |
| = to_sti_dvo_connector(connector); |
| struct sti_dvo *dvo = dvo_connector->dvo; |
| |
| result = clk_round_rate(dvo->clk_pix, target); |
| |
| DRM_DEBUG_DRIVER("target rate = %d => available rate = %d\n", |
| target, result); |
| |
| if ((result < target_min) || (result > target_max)) { |
| DRM_DEBUG_DRIVER("dvo pixclk=%d not supported\n", target); |
| return MODE_BAD; |
| } |
| |
| return MODE_OK; |
| } |
| |
| static const |
| struct drm_connector_helper_funcs sti_dvo_connector_helper_funcs = { |
| .get_modes = sti_dvo_connector_get_modes, |
| .mode_valid = sti_dvo_connector_mode_valid, |
| }; |
| |
| static enum drm_connector_status |
| sti_dvo_connector_detect(struct drm_connector *connector, bool force) |
| { |
| struct sti_dvo_connector *dvo_connector |
| = to_sti_dvo_connector(connector); |
| struct sti_dvo *dvo = dvo_connector->dvo; |
| |
| DRM_DEBUG_DRIVER("\n"); |
| |
| if (!dvo->panel) { |
| dvo->panel = of_drm_find_panel(dvo->panel_node); |
| if (dvo->panel) |
| drm_panel_attach(dvo->panel, connector); |
| } |
| |
| if (dvo->panel) |
| return connector_status_connected; |
| |
| return connector_status_disconnected; |
| } |
| |
| static int sti_dvo_late_register(struct drm_connector *connector) |
| { |
| struct sti_dvo_connector *dvo_connector |
| = to_sti_dvo_connector(connector); |
| struct sti_dvo *dvo = dvo_connector->dvo; |
| |
| if (dvo_debugfs_init(dvo, dvo->drm_dev->primary)) { |
| DRM_ERROR("DVO debugfs setup failed\n"); |
| return -EINVAL; |
| } |
| |
| return 0; |
| } |
| |
| static const struct drm_connector_funcs sti_dvo_connector_funcs = { |
| .dpms = drm_atomic_helper_connector_dpms, |
| .fill_modes = drm_helper_probe_single_connector_modes, |
| .detect = sti_dvo_connector_detect, |
| .destroy = drm_connector_cleanup, |
| .reset = drm_atomic_helper_connector_reset, |
| .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state, |
| .atomic_destroy_state = drm_atomic_helper_connector_destroy_state, |
| .late_register = sti_dvo_late_register, |
| }; |
| |
| static struct drm_encoder *sti_dvo_find_encoder(struct drm_device *dev) |
| { |
| struct drm_encoder *encoder; |
| |
| list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) { |
| if (encoder->encoder_type == DRM_MODE_ENCODER_LVDS) |
| return encoder; |
| } |
| |
| return NULL; |
| } |
| |
| static int sti_dvo_bind(struct device *dev, struct device *master, void *data) |
| { |
| struct sti_dvo *dvo = dev_get_drvdata(dev); |
| struct drm_device *drm_dev = data; |
| struct drm_encoder *encoder; |
| struct sti_dvo_connector *connector; |
| struct drm_connector *drm_connector; |
| struct drm_bridge *bridge; |
| int err; |
| |
| /* Set the drm device handle */ |
| dvo->drm_dev = drm_dev; |
| |
| encoder = sti_dvo_find_encoder(drm_dev); |
| if (!encoder) |
| return -ENOMEM; |
| |
| connector = devm_kzalloc(dev, sizeof(*connector), GFP_KERNEL); |
| if (!connector) |
| return -ENOMEM; |
| |
| connector->dvo = dvo; |
| |
| bridge = devm_kzalloc(dev, sizeof(*bridge), GFP_KERNEL); |
| if (!bridge) |
| return -ENOMEM; |
| |
| bridge->driver_private = dvo; |
| bridge->funcs = &sti_dvo_bridge_funcs; |
| bridge->of_node = dvo->dev.of_node; |
| err = drm_bridge_add(bridge); |
| if (err) { |
| DRM_ERROR("Failed to add bridge\n"); |
| return err; |
| } |
| |
| err = drm_bridge_attach(drm_dev, bridge); |
| if (err) { |
| DRM_ERROR("Failed to attach bridge\n"); |
| return err; |
| } |
| |
| dvo->bridge = bridge; |
| encoder->bridge = bridge; |
| connector->encoder = encoder; |
| dvo->encoder = encoder; |
| |
| drm_connector = (struct drm_connector *)connector; |
| |
| drm_connector->polled = DRM_CONNECTOR_POLL_HPD; |
| |
| drm_connector_init(drm_dev, drm_connector, |
| &sti_dvo_connector_funcs, DRM_MODE_CONNECTOR_LVDS); |
| drm_connector_helper_add(drm_connector, |
| &sti_dvo_connector_helper_funcs); |
| |
| err = drm_mode_connector_attach_encoder(drm_connector, encoder); |
| if (err) { |
| DRM_ERROR("Failed to attach a connector to a encoder\n"); |
| goto err_sysfs; |
| } |
| |
| return 0; |
| |
| err_sysfs: |
| drm_bridge_remove(bridge); |
| return -EINVAL; |
| } |
| |
| static void sti_dvo_unbind(struct device *dev, |
| struct device *master, void *data) |
| { |
| struct sti_dvo *dvo = dev_get_drvdata(dev); |
| struct drm_device *drm_dev = data; |
| |
| dvo_debugfs_exit(dvo, drm_dev->primary); |
| |
| drm_bridge_remove(dvo->bridge); |
| } |
| |
| static const struct component_ops sti_dvo_ops = { |
| .bind = sti_dvo_bind, |
| .unbind = sti_dvo_unbind, |
| }; |
| |
| static int sti_dvo_probe(struct platform_device *pdev) |
| { |
| struct device *dev = &pdev->dev; |
| struct sti_dvo *dvo; |
| struct resource *res; |
| struct device_node *np = dev->of_node; |
| |
| DRM_INFO("%s\n", __func__); |
| |
| dvo = devm_kzalloc(dev, sizeof(*dvo), GFP_KERNEL); |
| if (!dvo) { |
| DRM_ERROR("Failed to allocate memory for DVO\n"); |
| return -ENOMEM; |
| } |
| |
| dvo->dev = pdev->dev; |
| |
| res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "dvo-reg"); |
| if (!res) { |
| DRM_ERROR("Invalid dvo resource\n"); |
| return -ENOMEM; |
| } |
| dvo->regs = devm_ioremap_nocache(dev, res->start, |
| resource_size(res)); |
| if (!dvo->regs) |
| return -ENOMEM; |
| |
| dvo->clk_pix = devm_clk_get(dev, "dvo_pix"); |
| if (IS_ERR(dvo->clk_pix)) { |
| DRM_ERROR("Cannot get dvo_pix clock\n"); |
| return PTR_ERR(dvo->clk_pix); |
| } |
| |
| dvo->clk = devm_clk_get(dev, "dvo"); |
| if (IS_ERR(dvo->clk)) { |
| DRM_ERROR("Cannot get dvo clock\n"); |
| return PTR_ERR(dvo->clk); |
| } |
| |
| dvo->clk_main_parent = devm_clk_get(dev, "main_parent"); |
| if (IS_ERR(dvo->clk_main_parent)) { |
| DRM_DEBUG_DRIVER("Cannot get main_parent clock\n"); |
| dvo->clk_main_parent = NULL; |
| } |
| |
| dvo->clk_aux_parent = devm_clk_get(dev, "aux_parent"); |
| if (IS_ERR(dvo->clk_aux_parent)) { |
| DRM_DEBUG_DRIVER("Cannot get aux_parent clock\n"); |
| dvo->clk_aux_parent = NULL; |
| } |
| |
| dvo->panel_node = of_parse_phandle(np, "sti,panel", 0); |
| if (!dvo->panel_node) |
| DRM_ERROR("No panel associated to the dvo output\n"); |
| of_node_put(dvo->panel_node); |
| |
| platform_set_drvdata(pdev, dvo); |
| |
| return component_add(&pdev->dev, &sti_dvo_ops); |
| } |
| |
| static int sti_dvo_remove(struct platform_device *pdev) |
| { |
| component_del(&pdev->dev, &sti_dvo_ops); |
| return 0; |
| } |
| |
| static struct of_device_id dvo_of_match[] = { |
| { .compatible = "st,stih407-dvo", }, |
| { /* end node */ } |
| }; |
| MODULE_DEVICE_TABLE(of, dvo_of_match); |
| |
| struct platform_driver sti_dvo_driver = { |
| .driver = { |
| .name = "sti-dvo", |
| .owner = THIS_MODULE, |
| .of_match_table = dvo_of_match, |
| }, |
| .probe = sti_dvo_probe, |
| .remove = sti_dvo_remove, |
| }; |
| |
| MODULE_AUTHOR("Benjamin Gaignard <benjamin.gaignard@st.com>"); |
| MODULE_DESCRIPTION("STMicroelectronics SoC DRM driver"); |
| MODULE_LICENSE("GPL"); |