diff options
Diffstat (limited to 'drivers/gpu/drm/mcde/mcde_drv.c')
| -rw-r--r-- | drivers/gpu/drm/mcde/mcde_drv.c | 495 |
1 files changed, 495 insertions, 0 deletions
diff --git a/drivers/gpu/drm/mcde/mcde_drv.c b/drivers/gpu/drm/mcde/mcde_drv.c new file mode 100644 index 000000000..210f5e163 --- /dev/null +++ b/drivers/gpu/drm/mcde/mcde_drv.c @@ -0,0 +1,495 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright (C) 2018 Linus Walleij <linus.walleij@linaro.org> + * Parts of this file were based on the MCDE driver by Marcus Lorentzon + * (C) ST-Ericsson SA 2013 + */ + +/** + * DOC: ST-Ericsson MCDE Driver + * + * The MCDE (short for multi-channel display engine) is a graphics + * controller found in the Ux500 chipsets, such as NovaThor U8500. + * It was initially conceptualized by ST Microelectronics for the + * successor of the Nomadik line, STn8500 but productified in the + * ST-Ericsson U8500 where is was used for mass-market deployments + * in Android phones from Samsung and Sony Ericsson. + * + * It can do 1080p30 on SDTV CCIR656, DPI-2, DBI-2 or DSI for + * panels with or without frame buffering and can convert most + * input formats including most variants of RGB and YUV. + * + * The hardware has four display pipes, and the layout is a little + * bit like this:: + * + * Memory -> Overlay -> Channel -> FIFO -> 5 formatters -> DSI/DPI + * External 0..5 0..3 A,B, 3 x DSI bridge + * source 0..9 C0,C1 2 x DPI + * + * FIFOs A and B are for LCD and HDMI while FIFO CO/C1 are for + * panels with embedded buffer. + * 3 of the formatters are for DSI. + * 2 of the formatters are for DPI. + * + * Behind the formatters are the DSI or DPI ports that route to + * the external pins of the chip. As there are 3 DSI ports and one + * DPI port, it is possible to configure up to 4 display pipelines + * (effectively using channels 0..3) for concurrent use. + * + * In the current DRM/KMS setup, we use one external source, one overlay, + * one FIFO and one formatter which we connect to the simple CMA framebuffer + * helpers. We then provide a bridge to the DSI port, and on the DSI port + * bridge we connect hang a panel bridge or other bridge. This may be subject + * to change as we exploit more of the hardware capabilities. + * + * TODO: + * + * - Enabled damaged rectangles using drm_plane_enable_fb_damage_clips() + * so we can selectively just transmit the damaged area to a + * command-only display. + * - Enable mixing of more planes, possibly at the cost of moving away + * from using the simple framebuffer pipeline. + * - Enable output to bridges such as the AV8100 HDMI encoder from + * the DSI bridge. + */ + +#include <linux/clk.h> +#include <linux/component.h> +#include <linux/dma-buf.h> +#include <linux/irq.h> +#include <linux/io.h> +#include <linux/module.h> +#include <linux/of_platform.h> +#include <linux/platform_device.h> +#include <linux/regulator/consumer.h> +#include <linux/slab.h> +#include <linux/delay.h> + +#include <drm/drm_atomic_helper.h> +#include <drm/drm_bridge.h> +#include <drm/drm_drv.h> +#include <drm/drm_fb_cma_helper.h> +#include <drm/drm_fb_helper.h> +#include <drm/drm_gem.h> +#include <drm/drm_gem_cma_helper.h> +#include <drm/drm_gem_framebuffer_helper.h> +#include <drm/drm_managed.h> +#include <drm/drm_of.h> +#include <drm/drm_probe_helper.h> +#include <drm/drm_panel.h> +#include <drm/drm_vblank.h> + +#include "mcde_drm.h" + +#define DRIVER_DESC "DRM module for MCDE" + +#define MCDE_PID 0x000001FC +#define MCDE_PID_METALFIX_VERSION_SHIFT 0 +#define MCDE_PID_METALFIX_VERSION_MASK 0x000000FF +#define MCDE_PID_DEVELOPMENT_VERSION_SHIFT 8 +#define MCDE_PID_DEVELOPMENT_VERSION_MASK 0x0000FF00 +#define MCDE_PID_MINOR_VERSION_SHIFT 16 +#define MCDE_PID_MINOR_VERSION_MASK 0x00FF0000 +#define MCDE_PID_MAJOR_VERSION_SHIFT 24 +#define MCDE_PID_MAJOR_VERSION_MASK 0xFF000000 + +static const struct drm_mode_config_funcs mcde_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 struct drm_mode_config_helper_funcs mcde_mode_config_helpers = { + /* + * Using this function is necessary to commit atomic updates + * that need the CRTC to be enabled before a commit, as is + * the case with e.g. DSI displays. + */ + .atomic_commit_tail = drm_atomic_helper_commit_tail_rpm, +}; + +static irqreturn_t mcde_irq(int irq, void *data) +{ + struct mcde *mcde = data; + u32 val; + + val = readl(mcde->regs + MCDE_MISERR); + + mcde_display_irq(mcde); + + if (val) + dev_info(mcde->dev, "some error IRQ\n"); + writel(val, mcde->regs + MCDE_RISERR); + + return IRQ_HANDLED; +} + +static int mcde_modeset_init(struct drm_device *drm) +{ + struct drm_mode_config *mode_config; + struct mcde *mcde = to_mcde(drm); + int ret; + + if (!mcde->bridge) { + dev_err(drm->dev, "no display output bridge yet\n"); + return -EPROBE_DEFER; + } + + mode_config = &drm->mode_config; + mode_config->funcs = &mcde_mode_config_funcs; + mode_config->helper_private = &mcde_mode_config_helpers; + /* This hardware can do 1080p */ + mode_config->min_width = 1; + mode_config->max_width = 1920; + mode_config->min_height = 1; + mode_config->max_height = 1080; + + ret = drm_vblank_init(drm, 1); + if (ret) { + dev_err(drm->dev, "failed to init vblank\n"); + return ret; + } + + ret = mcde_display_init(drm); + if (ret) { + dev_err(drm->dev, "failed to init display\n"); + return ret; + } + + /* + * Attach the DSI bridge + * + * TODO: when adding support for the DPI bridge or several DSI bridges, + * we selectively connect the bridge(s) here instead of this simple + * attachment. + */ + ret = drm_simple_display_pipe_attach_bridge(&mcde->pipe, + mcde->bridge); + if (ret) { + dev_err(drm->dev, "failed to attach display output bridge\n"); + return ret; + } + + drm_mode_config_reset(drm); + drm_kms_helper_poll_init(drm); + + return 0; +} + +DEFINE_DRM_GEM_CMA_FOPS(drm_fops); + +static struct drm_driver mcde_drm_driver = { + .driver_features = + DRIVER_MODESET | DRIVER_GEM | DRIVER_ATOMIC, + .lastclose = drm_fb_helper_lastclose, + .ioctls = NULL, + .fops = &drm_fops, + .name = "mcde", + .desc = DRIVER_DESC, + .date = "20180529", + .major = 1, + .minor = 0, + .patchlevel = 0, + DRM_GEM_CMA_DRIVER_OPS, +}; + +static int mcde_drm_bind(struct device *dev) +{ + struct drm_device *drm = dev_get_drvdata(dev); + int ret; + + ret = drmm_mode_config_init(drm); + if (ret) + return ret; + + ret = component_bind_all(drm->dev, drm); + if (ret) { + dev_err(dev, "can't bind component devices\n"); + return ret; + } + + ret = mcde_modeset_init(drm); + if (ret) + goto unbind; + + ret = drm_dev_register(drm, 0); + if (ret < 0) + goto unbind; + + drm_fbdev_generic_setup(drm, 32); + + return 0; + +unbind: + component_unbind_all(drm->dev, drm); + return ret; +} + +static void mcde_drm_unbind(struct device *dev) +{ + struct drm_device *drm = dev_get_drvdata(dev); + + drm_dev_unregister(drm); + drm_atomic_helper_shutdown(drm); + component_unbind_all(drm->dev, drm); +} + +static const struct component_master_ops mcde_drm_comp_ops = { + .bind = mcde_drm_bind, + .unbind = mcde_drm_unbind, +}; + +static struct platform_driver *const mcde_component_drivers[] = { + &mcde_dsi_driver, +}; + +static int mcde_compare_dev(struct device *dev, void *data) +{ + return dev == data; +} + +static int mcde_probe(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + struct drm_device *drm; + struct mcde *mcde; + struct component_match *match = NULL; + struct resource *res; + u32 pid; + int irq; + int ret; + int i; + + mcde = devm_drm_dev_alloc(dev, &mcde_drm_driver, struct mcde, drm); + if (IS_ERR(mcde)) + return PTR_ERR(mcde); + drm = &mcde->drm; + mcde->dev = dev; + platform_set_drvdata(pdev, drm); + + /* First obtain and turn on the main power */ + mcde->epod = devm_regulator_get(dev, "epod"); + if (IS_ERR(mcde->epod)) { + ret = PTR_ERR(mcde->epod); + dev_err(dev, "can't get EPOD regulator\n"); + return ret; + } + ret = regulator_enable(mcde->epod); + if (ret) { + dev_err(dev, "can't enable EPOD regulator\n"); + return ret; + } + mcde->vana = devm_regulator_get(dev, "vana"); + if (IS_ERR(mcde->vana)) { + ret = PTR_ERR(mcde->vana); + dev_err(dev, "can't get VANA regulator\n"); + goto regulator_epod_off; + } + ret = regulator_enable(mcde->vana); + if (ret) { + dev_err(dev, "can't enable VANA regulator\n"); + goto regulator_epod_off; + } + /* + * The vendor code uses ESRAM (onchip RAM) and need to activate + * the v-esram34 regulator, but we don't use that yet + */ + + /* Clock the silicon so we can access the registers */ + mcde->mcde_clk = devm_clk_get(dev, "mcde"); + if (IS_ERR(mcde->mcde_clk)) { + dev_err(dev, "unable to get MCDE main clock\n"); + ret = PTR_ERR(mcde->mcde_clk); + goto regulator_off; + } + ret = clk_prepare_enable(mcde->mcde_clk); + if (ret) { + dev_err(dev, "failed to enable MCDE main clock\n"); + goto regulator_off; + } + dev_info(dev, "MCDE clk rate %lu Hz\n", clk_get_rate(mcde->mcde_clk)); + + mcde->lcd_clk = devm_clk_get(dev, "lcd"); + if (IS_ERR(mcde->lcd_clk)) { + dev_err(dev, "unable to get LCD clock\n"); + ret = PTR_ERR(mcde->lcd_clk); + goto clk_disable; + } + mcde->hdmi_clk = devm_clk_get(dev, "hdmi"); + if (IS_ERR(mcde->hdmi_clk)) { + dev_err(dev, "unable to get HDMI clock\n"); + ret = PTR_ERR(mcde->hdmi_clk); + goto clk_disable; + } + + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + mcde->regs = devm_ioremap_resource(dev, res); + if (IS_ERR(mcde->regs)) { + dev_err(dev, "no MCDE regs\n"); + ret = -EINVAL; + goto clk_disable; + } + + irq = platform_get_irq(pdev, 0); + if (irq < 0) { + ret = irq; + goto clk_disable; + } + + ret = devm_request_irq(dev, irq, mcde_irq, 0, "mcde", mcde); + if (ret) { + dev_err(dev, "failed to request irq %d\n", ret); + goto clk_disable; + } + + /* + * Check hardware revision, we only support U8500v2 version + * as this was the only version used for mass market deployment, + * but surely you can add more versions if you have them and + * need them. + */ + pid = readl(mcde->regs + MCDE_PID); + dev_info(dev, "found MCDE HW revision %d.%d (dev %d, metal fix %d)\n", + (pid & MCDE_PID_MAJOR_VERSION_MASK) + >> MCDE_PID_MAJOR_VERSION_SHIFT, + (pid & MCDE_PID_MINOR_VERSION_MASK) + >> MCDE_PID_MINOR_VERSION_SHIFT, + (pid & MCDE_PID_DEVELOPMENT_VERSION_MASK) + >> MCDE_PID_DEVELOPMENT_VERSION_SHIFT, + (pid & MCDE_PID_METALFIX_VERSION_MASK) + >> MCDE_PID_METALFIX_VERSION_SHIFT); + if (pid != 0x03000800) { + dev_err(dev, "unsupported hardware revision\n"); + ret = -ENODEV; + goto clk_disable; + } + + /* Disable and clear any pending interrupts */ + mcde_display_disable_irqs(mcde); + writel(0, mcde->regs + MCDE_IMSCERR); + writel(0xFFFFFFFF, mcde->regs + MCDE_RISERR); + + /* Spawn child devices for the DSI ports */ + devm_of_platform_populate(dev); + + /* Create something that will match the subdrivers when we bind */ + for (i = 0; i < ARRAY_SIZE(mcde_component_drivers); i++) { + struct device_driver *drv = &mcde_component_drivers[i]->driver; + struct device *p = NULL, *d; + + while ((d = platform_find_device_by_driver(p, drv))) { + put_device(p); + component_match_add(dev, &match, mcde_compare_dev, d); + p = d; + } + put_device(p); + } + if (!match) { + dev_err(dev, "no matching components\n"); + ret = -ENODEV; + goto clk_disable; + } + if (IS_ERR(match)) { + dev_err(dev, "could not create component match\n"); + ret = PTR_ERR(match); + goto clk_disable; + } + + /* + * Perform an invasive reset of the MCDE and all blocks by + * cutting the power to the subsystem, then bring it back up + * later when we enable the display as a result of + * component_master_add_with_match(). + */ + ret = regulator_disable(mcde->epod); + if (ret) { + dev_err(dev, "can't disable EPOD regulator\n"); + return ret; + } + /* Wait 50 ms so we are sure we cut the power */ + usleep_range(50000, 70000); + + ret = component_master_add_with_match(&pdev->dev, &mcde_drm_comp_ops, + match); + if (ret) { + dev_err(dev, "failed to add component master\n"); + /* + * The EPOD regulator is already disabled at this point so some + * special errorpath code is needed + */ + clk_disable_unprepare(mcde->mcde_clk); + regulator_disable(mcde->vana); + return ret; + } + + return 0; + +clk_disable: + clk_disable_unprepare(mcde->mcde_clk); +regulator_off: + regulator_disable(mcde->vana); +regulator_epod_off: + regulator_disable(mcde->epod); + return ret; + +} + +static int mcde_remove(struct platform_device *pdev) +{ + struct drm_device *drm = platform_get_drvdata(pdev); + struct mcde *mcde = to_mcde(drm); + + component_master_del(&pdev->dev, &mcde_drm_comp_ops); + clk_disable_unprepare(mcde->mcde_clk); + regulator_disable(mcde->vana); + regulator_disable(mcde->epod); + + return 0; +} + +static const struct of_device_id mcde_of_match[] = { + { + .compatible = "ste,mcde", + }, + {}, +}; + +static struct platform_driver mcde_driver = { + .driver = { + .name = "mcde", + .of_match_table = of_match_ptr(mcde_of_match), + }, + .probe = mcde_probe, + .remove = mcde_remove, +}; + +static struct platform_driver *const component_drivers[] = { + &mcde_dsi_driver, +}; + +static int __init mcde_drm_register(void) +{ + int ret; + + ret = platform_register_drivers(component_drivers, + ARRAY_SIZE(component_drivers)); + if (ret) + return ret; + + return platform_driver_register(&mcde_driver); +} + +static void __exit mcde_drm_unregister(void) +{ + platform_unregister_drivers(component_drivers, + ARRAY_SIZE(component_drivers)); + platform_driver_unregister(&mcde_driver); +} + +module_init(mcde_drm_register); +module_exit(mcde_drm_unregister); + +MODULE_ALIAS("platform:mcde-drm"); +MODULE_DESCRIPTION(DRIVER_DESC); +MODULE_AUTHOR("Linus Walleij <linus.walleij@linaro.org>"); +MODULE_LICENSE("GPL"); |