[PATCH v5 04/10] drm/stm: Add STM32 LTDC driver

Yannick Fertre
2017-03-28T09:44:47Z

This controller provides output signals to interface directly a variety
of LCD and TFT panels. These output signals are: RGB signals
(up to 24bpp), vertical & horizontal synchronisations, data enable and
the pixel clock.

Signed-off-by: Yannick Fertre <yannick.fertre@st.com>
---
drivers/gpu/drm/Kconfig | 3 +-
drivers/gpu/drm/Makefile | 1 +
drivers/gpu/drm/stm/Kconfig | 16 +
drivers/gpu/drm/stm/Makefile | 7 +
drivers/gpu/drm/stm/drv.c | 221 ++++++++
drivers/gpu/drm/stm/ltdc.c | 1210 ++++++++++++++++++++++++++++++++++++++++++
drivers/gpu/drm/stm/ltdc.h | 40 ++
7 files changed, 1497 insertions(+), 1 deletion(-)
create mode 100644 drivers/gpu/drm/stm/Kconfig
create mode 100644 drivers/gpu/drm/stm/Makefile
create mode 100644 drivers/gpu/drm/stm/drv.c
create mode 100644 drivers/gpu/drm/stm/ltdc.c
create mode 100644 drivers/gpu/drm/stm/ltdc.h

diff --git a/drivers/gpu/drm/Kconfig b/drivers/gpu/drm/Kconfig
index 78d7fc0..dd5762a 100644
--- a/drivers/gpu/drm/Kconfig
+++ b/drivers/gpu/drm/Kconfig
@@ -203,7 +203,6 @@ config DRM_VGEM
as used by Mesa's software renderer for enhanced performance.
If M is selected the module will be called vgem.

-
source "drivers/gpu/drm/exynos/Kconfig"

source "drivers/gpu/drm/rockchip/Kconfig"
@@ -246,6 +245,8 @@ source "drivers/gpu/drm/fsl-dcu/Kconfig"

source "drivers/gpu/drm/tegra/Kconfig"

+source "drivers/gpu/drm/stm/Kconfig"
+
source "drivers/gpu/drm/panel/Kconfig"

source "drivers/gpu/drm/bridge/Kconfig"
diff --git a/drivers/gpu/drm/Makefile b/drivers/gpu/drm/Makefile
index 59f0f9b..aa62ded 100644
--- a/drivers/gpu/drm/Makefile
+++ b/drivers/gpu/drm/Makefile
@@ -82,6 +82,7 @@ obj-$(CONFIG_DRM_BOCHS) += bochs/
obj-$(CONFIG_DRM_VIRTIO_GPU) += virtio/
obj-$(CONFIG_DRM_MSM) += msm/
obj-$(CONFIG_DRM_TEGRA) += tegra/
+obj-$(CONFIG_DRM_STM) += stm/
obj-$(CONFIG_DRM_STI) += sti/
obj-$(CONFIG_DRM_IMX) += imx/
obj-$(CONFIG_DRM_MEDIATEK) += mediatek/
diff --git a/drivers/gpu/drm/stm/Kconfig b/drivers/gpu/drm/stm/Kconfig
new file mode 100644
index 0000000..2c4817f
--- /dev/null
+++ b/drivers/gpu/drm/stm/Kconfig
@@ -0,0 +1,16 @@
+config DRM_STM
+ tristate "DRM Support for STMicroelectronics SoC Series"
+ depends on DRM && (ARCH_STM32 || ARCH_MULTIPLATFORM)
+ select DRM_KMS_HELPER
+ select DRM_GEM_CMA_HELPER
+ select DRM_KMS_CMA_HELPER
+ select DRM_PANEL
+ select VIDEOMODE_HELPERS
+ select FB_PROVIDE_GET_FB_UNMAPPED_AREA
+ default y
+
+ help
+ Enable support for the on-chip display controller on
+ STMicroelectronics STM32 MCUs.
+ To compile this driver as a module, choose M here: the module
+ will be called stm-drm.
diff --git a/drivers/gpu/drm/stm/Makefile b/drivers/gpu/drm/stm/Makefile
new file mode 100644
index 0000000..e114d45
--- /dev/null
+++ b/drivers/gpu/drm/stm/Makefile
@@ -0,0 +1,7 @@
+ccflags-y := -Iinclude/drm
+
+stm-drm-y := \
+ drv.o \
+ ltdc.o
+
+obj-$(CONFIG_DRM_STM) += stm-drm.o
diff --git a/drivers/gpu/drm/stm/drv.c b/drivers/gpu/drm/stm/drv.c
new file mode 100644
index 0000000..83ab48f
--- /dev/null
+++ b/drivers/gpu/drm/stm/drv.c
@@ -0,0 +1,221 @@
+/*
+ * Copyright (C) STMicroelectronics SA 2017
+ *
+ * Authors: Philippe Cornu <philippe.cornu@st.com>
+ * Yannick Fertre <yannick.fertre@st.com>
+ * Fabien Dessenne <fabien.dessenne@st.com>
+ * Mickael Reulier <mickael.reulier@st.com>
+ *
+ * License terms: GNU General Public License (GPL), version 2
+ */
+
+#include <linux/component.h>
+#include <linux/of_platform.h>
+
+#include <drm/drm_atomic.h>
+#include <drm/drm_atomic_helper.h>
+#include <drm/drm_crtc_helper.h>
+#include <drm/drm_fb_cma_helper.h>
+#include <drm/drm_gem_cma_helper.h>
+
+#include "ltdc.h"
+
+#define DRIVER_NAME "stm"
+#define DRIVER_DESC "STMicroelectronics SoC DRM"
+#define DRIVER_DATE "20170330"
+#define DRIVER_MAJOR 1
+#define DRIVER_MINOR 0
+#define DRIVER_PATCH_LEVEL 0
+
+#define STM_MAX_FB_WIDTH 2048
+#define STM_MAX_FB_HEIGHT 2048 /* same as width to handle orientation */
+
+static void drv_output_poll_changed(struct drm_device *ddev)
+{
+ struct ltdc_device *ldev = ddev->dev_private;
+
+ drm_fbdev_cma_hotplug_event(ldev->fbdev);
+}
+
+static const struct drm_mode_config_funcs drv_mode_config_funcs = {
+ .fb_create = drm_fb_cma_create,
+ .output_poll_changed = drv_output_poll_changed,
+ .atomic_check = drm_atomic_helper_check,
+ .atomic_commit = drm_atomic_helper_commit,
+};
+
+static void drv_lastclose(struct drm_device *ddev)
+{
+ struct ltdc_device *ldev = ddev->dev_private;
+
+ DRM_DEBUG("%s\n", __func__);
+
+ drm_fbdev_cma_restore_mode(ldev->fbdev);
+}
+
+DEFINE_DRM_GEM_CMA_FOPS(drv_driver_fops);
+
+static struct drm_driver drv_driver = {
+ .driver_features = DRIVER_MODESET | DRIVER_GEM | DRIVER_PRIME |
+ DRIVER_ATOMIC,
+ .lastclose = drv_lastclose,
+ .name = DRIVER_NAME,
+ .desc = DRIVER_DESC,
+ .date = DRIVER_DATE,
+ .major = DRIVER_MAJOR,
+ .minor = DRIVER_MINOR,
+ .patchlevel = DRIVER_PATCH_LEVEL,
+ .fops = &drv_driver_fops,
+ .dumb_create = drm_gem_cma_dumb_create,
+ .dumb_map_offset = drm_gem_cma_dumb_map_offset,
+ .dumb_destroy = drm_gem_dumb_destroy,
+ .prime_handle_to_fd = drm_gem_prime_handle_to_fd,
+ .prime_fd_to_handle = drm_gem_prime_fd_to_handle,
+ .gem_free_object_unlocked = drm_gem_cma_free_object,
+ .gem_vm_ops = &drm_gem_cma_vm_ops,
+ .gem_prime_export = drm_gem_prime_export,
+ .gem_prime_import = drm_gem_prime_import,
+ .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,
+ .enable_vblank = ltdc_crtc_enable_vblank,
+ .disable_vblank = ltdc_crtc_disable_vblank,
+};
+
+static int drv_load(struct drm_device *ddev)
+{
+ struct platform_device *pdev = to_platform_device(ddev->dev);
+ struct drm_fbdev_cma *fbdev;
+ struct ltdc_device *ldev;
+ int ret;
+
+ DRM_DEBUG("%s\n", __func__);
+
+ ldev = devm_kzalloc(ddev->dev, sizeof(*ldev), GFP_KERNEL);
+ if (!ldev)
+ return -ENOMEM;
+
+ ddev->dev_private = (void *)ldev;
+
+ drm_mode_config_init(ddev);
+
+ /*
+ * set max width and height as default value.
+ * this value would be used to check framebuffer size limitation
+ * at drm_mode_addfb().
+ */
+ ddev->mode_config.min_width = 0;
+ ddev->mode_config.min_height = 0;
+ ddev->mode_config.max_width = STM_MAX_FB_WIDTH;
+ ddev->mode_config.max_height = STM_MAX_FB_HEIGHT;
+ ddev->mode_config.funcs = &drv_mode_config_funcs;
+
+ ret = ltdc_load(ddev);
+ if (ret)
+ goto err;
+
+ drm_mode_config_reset(ddev);
+ drm_kms_helper_poll_init(ddev);
+
+ if (ddev->mode_config.num_connector) {
+ ldev = ddev->dev_private;
+ fbdev = drm_fbdev_cma_init(ddev, 16,
+ ddev->mode_config.num_connector);
+ if (IS_ERR(fbdev)) {
+ DRM_DEBUG("Warning: fails to create fbdev\n");
+ fbdev = NULL;
+ }
+ ldev->fbdev = fbdev;
+ }
+
+ platform_set_drvdata(pdev, ddev);
+
+ return 0;
+err:
+ drm_mode_config_cleanup(ddev);
+ return ret;
+}
+
+static void drv_unload(struct drm_device *ddev)
+{
+ struct ltdc_device *ldev = ddev->dev_private;
+
+ DRM_DEBUG("%s\n", __func__);
+
+ if (ldev->fbdev) {
+ drm_fbdev_cma_fini(ldev->fbdev);
+ ldev->fbdev = NULL;
+ }
+ drm_kms_helper_poll_fini(ddev);
+ ltdc_unload(ddev);
+ drm_mode_config_cleanup(ddev);
+}
+
+static int stm_drm_platform_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct drm_device *ddev;
+ int ret;
+
+ DRM_DEBUG("%s\n", __func__);
+
+ dma_set_coherent_mask(dev, DMA_BIT_MASK(32));
+
+ ddev = drm_dev_alloc(&drv_driver, dev);
+ if (IS_ERR(ddev))
+ return PTR_ERR(ddev);
+
+ ret = drv_load(ddev);
+ if (ret)
+ goto err_unref;
+
+ ret = drm_dev_register(ddev, 0);
+ if (ret)
+ goto err_unref;
+
+ return 0;
+
+err_unref:
+ drm_dev_unref(ddev);
+
+ return ret;
+}
+
+static int stm_drm_platform_remove(struct platform_device *pdev)
+{
+ struct drm_device *ddev = platform_get_drvdata(pdev);
+
+ DRM_DEBUG("%s\n", __func__);
+
+ drm_dev_unregister(ddev);
+ drv_unload(ddev);
+ drm_dev_unref(ddev);
+
+ return 0;
+}
+
+static const struct of_device_id drv_dt_ids[] = {
+ { .compatible = "st,stm32-ltdc"},
+ { /* end node */ },
+};
+MODULE_DEVICE_TABLE(of, drv_dt_ids);
+
+static struct platform_driver stm_drm_platform_driver = {
+ .probe = stm_drm_platform_probe,
+ .remove = stm_drm_platform_remove,
+ .driver = {
+ .name = DRIVER_NAME,
+ .of_match_table = drv_dt_ids,
+ },
+};
+
+module_platform_driver(stm_drm_platform_driver);
+
+MODULE_AUTHOR("Philippe Cornu <philippe.cornu@st.com>");
+MODULE_AUTHOR("Yannick Fertre <yannick.fertre@st.com>");
+MODULE_AUTHOR("Fabien Dessenne <fabien.dessenne@st.com>");
+MODULE_AUTHOR("Mickael Reulier <mickael.reulier@st.com>");
+MODULE_DESCRIPTION("STMicroelectronics ST DRM LTDC driver");
+MODULE_LICENSE("GPL v2");
diff --git a/drivers/gpu/drm/stm/ltdc.c b/drivers/gpu/drm/stm/ltdc.c
new file mode 100644
index 0000000..922f021
--- /dev/null
+++ b/drivers/gpu/drm/stm/ltdc.c
@@ -0,0 +1,1210 @@
+/*
+ * Copyright (C) STMicroelectronics SA 2017
+ *
+ * Authors: Philippe Cornu <philippe.cornu@st.com>
+ * Yannick Fertre <yannick.fertre@st.com>
+ * Fabien Dessenne <fabien.dessenne@st.com>
+ * Mickael Reulier <mickael.reulier@st.com>
+ *
+ * License terms: GNU General Public License (GPL), version 2
+ */
+
+#include <linux/clk.h>
+#include <linux/component.h>
+#include <linux/of_address.h>
+#include <linux/of_graph.h>
+#include <linux/reset.h>
+
+#include <drm/drm_atomic.h>
+#include <drm/drm_atomic_helper.h>
+#include <drm/drm_crtc_helper.h>
+#include <drm/drm_fb_cma_helper.h>
+#include <drm/drm_gem_cma_helper.h>
+#include <drm/drm_of.h>
+#include <drm/drm_panel.h>
+#include <drm/drm_plane_helper.h>
+
+#include <video/videomode.h>
+
+#include "ltdc.h"
+
+#define NB_CRTC 1
+#define CRTC_MASK GENMASK(NB_CRTC - 1, 0)
+
+#define MAX_IRQ 4
+
+#define HWVER_10200 0x010200
+#define HWVER_10300 0x010300
+#define HWVER_20101 0x020101
+
+/*
+ * The address of some registers depends on the HW version: such registers have
+ * an extra offset specified with reg_ofs.
+ */
+#define REG_OFS_NONE 0
+#define REG_OFS_4 4 /* Insertion of "Layer Configuration 2" reg */
+#define REG_OFS (ldev->caps.reg_ofs)
+#define LAY_OFS 0x80 /* Register Offset between 2 layers */
+
+/* Global register offsets */
+#define LTDC_IDR 0x0000 /* IDentification */
+#define LTDC_LCR 0x0004 /* Layer Count */
+#define LTDC_SSCR 0x0008 /* Synchronization Size Configuration */
+#define LTDC_BPCR 0x000C /* Back Porch Configuration */
+#define LTDC_AWCR 0x0010 /* Active Width Configuration */
+#define LTDC_TWCR 0x0014 /* Total Width Configuration */
+#define LTDC_GCR 0x0018 /* Global Control */
+#define LTDC_GC1R 0x001C /* Global Configuration 1 */
+#define LTDC_GC2R 0x0020 /* Global Configuration 2 */
+#define LTDC_SRCR 0x0024 /* Shadow Reload Configuration */
+#define LTDC_GACR 0x0028 /* GAmma Correction */
+#define LTDC_BCCR 0x002C /* Background Color Configuration */
+#define LTDC_IER 0x0034 /* Interrupt Enable */
+#define LTDC_ISR 0x0038 /* Interrupt Status */
+#define LTDC_ICR 0x003C /* Interrupt Clear */
+#define LTDC_LIPCR 0x0040 /* Line Interrupt Position Configuration */
+#define LTDC_CPSR 0x0044 /* Current Position Status */
+#define LTDC_CDSR 0x0048 /* Current Display Status */
+
+/* Layer register offsets */
+#define LTDC_L1LC1R (0x0080) /* L1 Layer Configuration 1 */
+#define LTDC_L1LC2R (0x0084) /* L1 Layer Configuration 2 */
+#define LTDC_L1CR (0x0084 + REG_OFS) /* L1 Control */
+#define LTDC_L1WHPCR (0x0088 + REG_OFS) /* L1 Window Hor Position Config */
+#define LTDC_L1WVPCR (0x008C + REG_OFS) /* L1 Window Vert Position Config */
+#define LTDC_L1CKCR (0x0090 + REG_OFS) /* L1 Color Keying Configuration */
+#define LTDC_L1PFCR (0x0094 + REG_OFS) /* L1 Pixel Format Configuration */
+#define LTDC_L1CACR (0x0098 + REG_OFS) /* L1 Constant Alpha Config */
+#define LTDC_L1DCCR (0x009C + REG_OFS) /* L1 Default Color Configuration */
+#define LTDC_L1BFCR (0x00A0 + REG_OFS) /* L1 Blend Factors Configuration */
+#define LTDC_L1FBBCR (0x00A4 + REG_OFS) /* L1 FrameBuffer Bus Control */
+#define LTDC_L1AFBCR (0x00A8 + REG_OFS) /* L1 AuxFB Control */
+#define LTDC_L1CFBAR (0x00AC + REG_OFS) /* L1 Color FrameBuffer Address */
+#define LTDC_L1CFBLR (0x00B0 + REG_OFS) /* L1 Color FrameBuffer Length */
+#define LTDC_L1CFBLNR (0x00B4 + REG_OFS) /* L1 Color FrameBuffer Line Nb */
+#define LTDC_L1AFBAR (0x00B8 + REG_OFS) /* L1 AuxFB Address */
+#define LTDC_L1AFBLR (0x00BC + REG_OFS) /* L1 AuxFB Length */
+#define LTDC_L1AFBLNR (0x00C0 + REG_OFS) /* L1 AuxFB Line Number */
+#define LTDC_L1CLUTWR (0x00C4 + REG_OFS) /* L1 CLUT Write */
+#define LTDC_L1YS1R (0x00E0 + REG_OFS) /* L1 YCbCr Scale 1 */
+#define LTDC_L1YS2R (0x00E4 + REG_OFS) /* L1 YCbCr Scale 2 */
+
+/* Bit definitions */
+#define SSCR_VSH GENMASK(10, 0) /* Vertical Synchronization Height */
+#define SSCR_HSW GENMASK(27, 16) /* Horizontal Synchronization Width */
+
+#define BPCR_AVBP GENMASK(10, 0) /* Accumulated Vertical Back Porch */
+#define BPCR_AHBP GENMASK(27, 16) /* Accumulated Horizontal Back Porch */
+
+#define AWCR_AAH GENMASK(10, 0) /* Accumulated Active Height */
+#define AWCR_AAW GENMASK(27, 16) /* Accumulated Active Width */
+
+#define TWCR_TOTALH GENMASK(10, 0) /* TOTAL Height */
+#define TWCR_TOTALW GENMASK(27, 16) /* TOTAL Width */
+
+#define GCR_LTDCEN BIT(0) /* LTDC ENable */
+#define GCR_DEN BIT(16) /* Dither ENable */
+#define GCR_PCPOL BIT(28) /* Pixel Clock POLarity */
+#define GCR_DEPOL BIT(29) /* Data Enable POLarity */
+#define GCR_VSPOL BIT(30) /* Vertical Synchro POLarity */
+#define GCR_HSPOL BIT(31) /* Horizontal Synchro POLarity */
+
+#define GC1R_WBCH GENMASK(3, 0) /* Width of Blue CHannel output */
+#define GC1R_WGCH GENMASK(7, 4) /* Width of Green Channel output */
+#define GC1R_WRCH GENMASK(11, 8) /* Width of Red Channel output */
+#define GC1R_PBEN BIT(12) /* Precise Blending ENable */
+#define GC1R_DT GENMASK(15, 14) /* Dithering Technique */
+#define GC1R_GCT GENMASK(19, 17) /* Gamma Correction Technique */
+#define GC1R_SHREN BIT(21) /* SHadow Registers ENabled */
+#define GC1R_BCP BIT(22) /* Background Colour Programmable */
+#define GC1R_BBEN BIT(23) /* Background Blending ENabled */
+#define GC1R_LNIP BIT(24) /* Line Number IRQ Position */
+#define GC1R_TP BIT(25) /* Timing Programmable */
+#define GC1R_IPP BIT(26) /* IRQ Polarity Programmable */
+#define GC1R_SPP BIT(27) /* Sync Polarity Programmable */
+#define GC1R_DWP BIT(28) /* Dither Width Programmable */
+#define GC1R_STREN BIT(29) /* STatus Registers ENabled */
+#define GC1R_BMEN BIT(31) /* Blind Mode ENabled */
+
+#define GC2R_EDCA BIT(0) /* External Display Control Ability */
+#define GC2R_STSAEN BIT(1) /* Slave Timing Sync Ability ENabled */
+#define GC2R_DVAEN BIT(2) /* Dual-View Ability ENabled */
+#define GC2R_DPAEN BIT(3) /* Dual-Port Ability ENabled */
+#define GC2R_BW GENMASK(6, 4) /* Bus Width (log2 of nb of bytes) */
+#define GC2R_EDCEN BIT(7) /* External Display Control ENabled */
+
+#define SRCR_IMR BIT(0) /* IMmediate Reload */
+#define SRCR_VBR BIT(1) /* Vertical Blanking Reload */
+
+#define BCCR_BCBLACK 0x00 /* Background Color BLACK */
+#define BCCR_BCBLUE GENMASK(7, 0) /* Background Color BLUE */
+#define BCCR_BCGREEN GENMASK(15, 8) /* Background Color GREEN */
+#define BCCR_BCRED GENMASK(23, 16) /* Background Color RED */
+#define BCCR_BCWHITE GENMASK(23, 0) /* Background Color WHITE */
+
+#define IER_LIE BIT(0) /* Line Interrupt Enable */
+#define IER_FUIE BIT(1) /* Fifo Underrun Interrupt Enable */
+#define IER_TERRIE BIT(2) /* Transfer ERRor Interrupt Enable */
+#define IER_RRIE BIT(3) /* Register Reload Interrupt enable */
+
+#define ISR_LIF BIT(0) /* Line Interrupt Flag */
+#define ISR_FUIF BIT(1) /* Fifo Underrun Interrupt Flag */
+#define ISR_TERRIF BIT(2) /* Transfer ERRor Interrupt Flag */
+#define ISR_RRIF BIT(3) /* Register Reload Interrupt Flag */
+
+#define LXCR_LEN BIT(0) /* Layer ENable */
+#define LXCR_COLKEN BIT(1) /* Color Keying Enable */
+#define LXCR_CLUTEN BIT(4) /* Color Look-Up Table ENable */
+
+#define LXWHPCR_WHSTPOS GENMASK(11, 0) /* Window Horizontal StarT POSition */
+#define LXWHPCR_WHSPPOS GENMASK(27, 16) /* Window Horizontal StoP POSition */
+
+#define LXWVPCR_WVSTPOS GENMASK(10, 0) /* Window Vertical StarT POSition */
+#define LXWVPCR_WVSPPOS GENMASK(26, 16) /* Window Vertical StoP POSition */
+
+#define LXPFCR_PF GENMASK(2, 0) /* Pixel Format */
+
+#define LXCACR_CONSTA GENMASK(7, 0) /* CONSTant Alpha */
+
+#define LXBFCR_BF2 GENMASK(2, 0) /* Blending Factor 2 */
+#define LXBFCR_BF1 GENMASK(10, 8) /* Blending Factor 1 */
+
+#define LXCFBLR_CFBLL GENMASK(12, 0) /* Color Frame Buffer Line Length */
+#define LXCFBLR_CFBP GENMASK(28, 16) /* Color Frame Buffer Pitch in bytes */
+
+#define LXCFBLNR_CFBLN GENMASK(10, 0) /* Color Frame Buffer Line Number */
+
+#define HSPOL_AL 0 /* Horizontal Sync POLarity Active Low */
+#define VSPOL_AL 0 /* Vertical Sync POLarity Active Low */
+#define DEPOL_AL 0 /* Data Enable POLarity Active Low */
+#define PCPOL_IPC 0 /* Input Pixel Clock */
+#define HSPOL_AH GCR_HSPOL /* Horizontal Sync POLarity Active High */
+#define VSPOL_AH GCR_VSPOL /* Vertical Sync POLarity Active High */
+#define DEPOL_AH GCR_DEPOL /* Data Enable POLarity Active High */
+#define PCPOL_IIPC GCR_PCPOL /* Inverted Input Pixel Clock */
+#define CONSTA_MAX 0xFF /* CONSTant Alpha MAX= 1.0 */
+#define BF1_PAXCA 0x600 /* Pixel Alpha x Constant Alpha */
+#define BF1_CA 0x400 /* Constant Alpha */
+#define BF2_1PAXCA 0x007 /* 1 - (Pixel Alpha x Constant Alpha) */
+#define BF2_1CA 0x005 /* 1 - Constant Alpha */
+
+#define NB_PF 8 /* Max nb of HW pixel format */
+
+enum ltdc_pix_fmt {
+ PF_NONE,
+ /* RGB formats */
+ PF_ARGB8888, /* ARGB [32 bits] */
+ PF_RGBA8888, /* RGBA [32 bits] */
+ PF_RGB888, /* RGB [24 bits] */
+ PF_RGB565, /* RGB [16 bits] */
+ PF_ARGB1555, /* ARGB A:1 bit RGB:15 bits [16 bits] */
+ PF_ARGB4444, /* ARGB A:4 bits R/G/B: 4 bits each [16 bits] */
+ /* Indexed formats */
+ PF_L8, /* Indexed 8 bits [8 bits] */
+ PF_AL44, /* Alpha:4 bits + indexed 4 bits [8 bits] */
+ PF_AL88 /* Alpha:8 bits + indexed 8 bits [16 bits] */
+};
+
+/* The index gives the encoding of the pixel format for an HW version */
+static const enum ltdc_pix_fmt ltdc_pix_fmt_a0[NB_PF] = {
+ PF_ARGB8888, /* 0x00 */
+ PF_RGB888, /* 0x01 */
+ PF_RGB565, /* 0x02 */
+ PF_ARGB1555, /* 0x03 */
+ PF_ARGB4444, /* 0x04 */
+ PF_L8, /* 0x05 */
+ PF_AL44, /* 0x06 */
+ PF_AL88 /* 0x07 */
+};
+
+static const enum ltdc_pix_fmt ltdc_pix_fmt_a1[NB_PF] = {
+ PF_ARGB8888, /* 0x00 */
+ PF_RGB888, /* 0x01 */
+ PF_RGB565, /* 0x02 */
+ PF_RGBA8888, /* 0x03 */
+ PF_AL44, /* 0x04 */
+ PF_L8, /* 0x05 */
+ PF_ARGB1555, /* 0x06 */
+ PF_ARGB4444 /* 0x07 */
+};
+
+static inline u32 reg_read(void __iomem *base, u32 reg)
+{
+ return readl_relaxed(base + reg);
+}
+
+static inline void reg_write(void __iomem *base, u32 reg, u32 val)
+{
+ writel_relaxed(val, base + reg);
+}
+
+static inline void reg_set(void __iomem *base, u32 reg, u32 mask)
+{
+ reg_write(base, reg, reg_read(base, reg) | mask);
+}
+
+static inline void reg_clear(void __iomem *base, u32 reg, u32 mask)
+{
+ reg_write(base, reg, reg_read(base, reg) & ~mask);
+}
+
+static inline void reg_update_bits(void __iomem *base, u32 reg, u32 mask,
+ u32 val)
+{
+ reg_write(base, reg, (reg_read(base, reg) & ~mask) | val);
+}
+
+static inline struct ltdc_device *crtc_to_ltdc(struct drm_crtc *crtc)
+{
+ return (struct ltdc_device *)crtc->dev->dev_private;
+}
+
+static inline struct ltdc_device *plane_to_ltdc(struct drm_plane *plane)
+{
+ return (struct ltdc_device *)plane->dev->dev_private;
+}
+
+static inline struct ltdc_device *encoder_to_ltdc(struct drm_encoder *enc)
+{
+ return (struct ltdc_device *)enc->dev->dev_private;
+}
+
+static inline struct ltdc_device *connector_to_ltdc(struct drm_connector *con)
+{
+ return (struct ltdc_device *)con->dev->dev_private;
+}
+
+static inline enum ltdc_pix_fmt to_ltdc_pixelformat(u32 drm_fmt)
+{
+ enum ltdc_pix_fmt pf;
+
+ switch (drm_fmt) {
+ case DRM_FORMAT_ARGB8888:
+ case DRM_FORMAT_XRGB8888:
+ pf = PF_ARGB8888;
+ break;
+ case DRM_FORMAT_RGBA8888:
+ case DRM_FORMAT_RGBX8888:
+ pf = PF_RGBA8888;
+ break;
+ case DRM_FORMAT_RGB888:
+ pf = PF_RGB888;
+ break;
+ case DRM_FORMAT_RGB565:
+ pf = PF_RGB565;
+ break;
+ case DRM_FORMAT_ARGB1555:
+ case DRM_FORMAT_XRGB1555:
+ pf = PF_ARGB1555;
+ break;
+ case DRM_FORMAT_ARGB4444:
+ case DRM_FORMAT_XRGB4444:
+ pf = PF_ARGB4444;
+ break;
+ case DRM_FORMAT_C8:
+ pf = PF_L8;
+ break;
+ default:
+ pf = PF_NONE;
+ break;
+ /* Note: There are no DRM_FORMAT for AL44 and AL88 */
+ }
+
+ return pf;
+}
+
+static inline u32 to_drm_pixelformat(enum ltdc_pix_fmt pf)
+{
+ switch (pf) {
+ case PF_ARGB8888:
+ return DRM_FORMAT_ARGB8888;
+ case PF_RGBA8888:
+ return DRM_FORMAT_RGBA8888;
+ case PF_RGB888:
+ return DRM_FORMAT_RGB888;
+ case PF_RGB565:
+ return DRM_FORMAT_RGB565;
+ case PF_ARGB1555:
+ return DRM_FORMAT_ARGB1555;
+ case PF_ARGB4444:
+ return DRM_FORMAT_ARGB4444;
+ case PF_L8:
+ return DRM_FORMAT_C8;
+ case PF_AL44: /* No DRM support */
+ case PF_AL88: /* No DRM support */
+ case PF_NONE:
+ default:
+ return 0;
+ }
+}
+
+static irqreturn_t ltdc_irq_thread(int irq, void *arg)
+{
+ struct drm_device *ddev = arg;
+ struct ltdc_device *ldev = ddev->dev_private;
+ struct drm_crtc *crtc = drm_crtc_from_index(ddev, 0);
+
+ /* Line IRQ : trigger the vblank event */
+ if (ldev->irq_status & ISR_LIF)
+ drm_crtc_handle_vblank(crtc);
+
+ /* Save FIFO Underrun & Transfer Error status */
+ mutex_lock(&ldev->err_lock);
+ if (ldev->irq_status & ISR_FUIF)
+ ldev->error_status |= ISR_FUIF;
+ if (ldev->irq_status & ISR_TERRIF)
+ ldev->error_status |= ISR_TERRIF;
+ mutex_unlock(&ldev->err_lock);
+
+ return IRQ_HANDLED;
+}
+
+static irqreturn_t ltdc_irq(int irq, void *arg)
+{
+ struct drm_device *ddev = arg;
+ struct ltdc_device *ldev = ddev->dev_private;
+
+ /* Read & Clear the interrupt status */
+ ldev->irq_status = reg_read(ldev->regs, LTDC_ISR);
+ reg_write(ldev->regs, LTDC_ICR, ldev->irq_status);
+
+ return IRQ_WAKE_THREAD;
+}
+
+/*
+ * DRM_CRTC
+ */
+
+static void ltdc_crtc_load_lut(struct drm_crtc *crtc)
+{
+ struct ltdc_device *ldev = crtc_to_ltdc(crtc);
+ unsigned int i, lay;
+
+ for (lay = 0; lay < ldev->caps.nb_layers; lay++)
+ for (i = 0; i < 256; i++)
+ reg_write(ldev->regs, LTDC_L1CLUTWR + lay * LAY_OFS,
+ ldev->clut[i]);
+}
+
+static void ltdc_crtc_enable(struct drm_crtc *crtc)
+{
+ struct ltdc_device *ldev = crtc_to_ltdc(crtc);
+
+ DRM_DEBUG_DRIVER("\n");
+
+ /* Sets the background color value */
+ reg_write(ldev->regs, LTDC_BCCR, BCCR_BCBLACK);
+
+ /* Enable IRQ */
+ reg_set(ldev->regs, LTDC_IER, IER_RRIE | IER_FUIE | IER_TERRIE);
+
+ /* Immediately commit the planes */
+ reg_set(ldev->regs, LTDC_SRCR, SRCR_IMR);
+
+ /* Enable LTDC */
+ reg_set(ldev->regs, LTDC_GCR, GCR_LTDCEN);
+
+ drm_crtc_vblank_on(crtc);
+}
+
+static void ltdc_crtc_disable(struct drm_crtc *crtc)
+{
+ struct ltdc_device *ldev = crtc_to_ltdc(crtc);
+ struct drm_pending_vblank_event *event = crtc->state->event;
+
+ DRM_DEBUG_DRIVER("\n");
+
+ if (!crtc->enabled) {
+ DRM_DEBUG_DRIVER("already disabled\n");
+ return;
+ }
+
+ drm_crtc_vblank_off(crtc);
+
+ /* disable LTDC */
+ reg_clear(ldev->regs, LTDC_GCR, GCR_LTDCEN);
+
+ /* disable IRQ */
+ reg_clear(ldev->regs, LTDC_IER, IER_RRIE | IER_FUIE | IER_TERRIE);
+
+ /* immediately commit disable of layers before switching off LTDC */
+ reg_set(ldev->regs, LTDC_SRCR, SRCR_IMR);
+
+ if (event) {
+ crtc->state->event = NULL;
+
+ spin_lock_irq(&crtc->dev->event_lock);
+ if (crtc->state->active && 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 ltdc_crtc_mode_set_nofb(struct drm_crtc *crtc)
+{
+ struct ltdc_device *ldev = crtc_to_ltdc(crtc);
+ struct drm_display_mode *mode = &crtc->state->adjusted_mode;
+ struct videomode vm;
+ int rate = mode->clock * 1000;
+ u32 hsync, vsync, accum_hbp, accum_vbp, accum_act_w, accum_act_h;
+ u32 total_width, total_height;
+ u32 val;
+
+ drm_display_mode_to_videomode(mode, &vm);
+
+ DRM_DEBUG_DRIVER("CRTC:%d mode:%s\n", crtc->base.id, mode->name);
+ DRM_DEBUG_DRIVER("Video mode: %dx%d", vm.hactive, vm.vactive);
+ DRM_DEBUG_DRIVER(" hfp %d hbp %d hsl %d vfp %d vbp %d vsl %d\n",
+ vm.hfront_porch, vm.hback_porch, vm.hsync_len,
+ vm.vfront_porch, vm.vback_porch, vm.vsync_len);
+
+ /* Convert video timings to ltdc timings */
+ hsync = vm.hsync_len - 1;
+ vsync = vm.vsync_len - 1;
+ accum_hbp = hsync + vm.hback_porch;
+ accum_vbp = vsync + vm.vback_porch;
+ accum_act_w = accum_hbp + vm.hactive;
+ accum_act_h = accum_vbp + vm.vactive;
+ total_width = accum_act_w + vm.hfront_porch;
+ total_height = accum_act_h + vm.vfront_porch;
+
+ clk_disable(ldev->pixel_clk);
+
+ if (clk_set_rate(ldev->pixel_clk, rate) < 0) {
+ DRM_ERROR("Cannot set rate (%dHz) for pixel clk\n", rate);
+ return;
+ }
+
+ clk_enable(ldev->pixel_clk);
+
+ /* Configures the HS, VS, DE and PC polarities. */
+ val = HSPOL_AL | HSPOL_AL | DEPOL_AL | PCPOL_IPC;
+
+ if (vm.flags & DISPLAY_FLAGS_HSYNC_HIGH)
+ val |= HSPOL_AH;
+
+ if (vm.flags & DISPLAY_FLAGS_VSYNC_HIGH)
+ val |= VSPOL_AH;
+
+ if (vm.flags & DISPLAY_FLAGS_DE_HIGH)
+ val |= DEPOL_AH;
+
+ if (vm.flags & DISPLAY_FLAGS_PIXDATA_NEGEDGE)
+ val |= PCPOL_IIPC;
+
+ reg_update_bits(ldev->regs, LTDC_GCR,
+ GCR_HSPOL | GCR_VSPOL | GCR_DEPOL | GCR_PCPOL, val);
+
+ /* Set Synchronization size */
+ val = (hsync << 16) | vsync;
+ reg_update_bits(ldev->regs, LTDC_SSCR, SSCR_VSH | SSCR_HSW, val);
+
+ /* Set Accumulated Back porch */
+ val = (accum_hbp << 16) | accum_vbp;
+ reg_update_bits(ldev->regs, LTDC_BPCR, BPCR_AVBP | BPCR_AHBP, val);
+
+ /* Set Accumulated Active Width */
+ val = (accum_act_w << 16) | accum_act_h;
+ reg_update_bits(ldev->regs, LTDC_AWCR, AWCR_AAW | AWCR_AAH, val);
+
+ /* Set total width & height */
+ val = (total_width << 16) | total_height;
+ reg_update_bits(ldev->regs, LTDC_TWCR, TWCR_TOTALH | TWCR_TOTALW, val);
+
+ reg_write(ldev->regs, LTDC_LIPCR, (accum_act_h + 1));
+}
+
+static void ltdc_crtc_atomic_flush(struct drm_crtc *crtc,
+ struct drm_crtc_state *old_crtc_state)
+{
+ struct ltdc_device *ldev = crtc_to_ltdc(crtc);
+ struct drm_pending_vblank_event *event = crtc->state->event;
+
+ DRM_DEBUG_ATOMIC("\n");
+
+ /* Commit shadow registers = update planes at next vblank */
+ reg_set(ldev->regs, LTDC_SRCR, SRCR_VBR);
+
+ if (event) {
+ crtc->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 struct drm_crtc_helper_funcs ltdc_crtc_helper_funcs = {
+ .load_lut = ltdc_crtc_load_lut,
+ .enable = ltdc_crtc_enable,
+ .disable = ltdc_crtc_disable,
+ .mode_set_nofb = ltdc_crtc_mode_set_nofb,
+ .atomic_flush = ltdc_crtc_atomic_flush,
+};
+
+int ltdc_crtc_enable_vblank(struct drm_device *ddev, unsigned int pipe)
+{
+ struct ltdc_device *ldev = ddev->dev_private;
+
+ DRM_DEBUG_DRIVER("\n");
+ reg_set(ldev->regs, LTDC_IER, IER_LIE);
+
+ return 0;
+}
+
+void ltdc_crtc_disable_vblank(struct drm_device *ddev, unsigned int pipe)
+{
+ struct ltdc_device *ldev = ddev->dev_private;
+
+ DRM_DEBUG_DRIVER("\n");
+ reg_clear(ldev->regs, LTDC_IER, IER_LIE);
+}
+
+static struct drm_crtc_funcs ltdc_crtc_funcs = {
+ .destroy = drm_crtc_cleanup,
+ .set_config = drm_atomic_helper_set_config,
+ .page_flip = drm_atomic_helper_page_flip,
+ .reset = drm_atomic_helper_crtc_reset,
+ .atomic_duplicate_state = drm_atomic_helper_crtc_duplicate_state,
+ .atomic_destroy_state = drm_atomic_helper_crtc_destroy_state,
+};
+
+/*
+ * DRM_PLANE
+ */
+
+static int ltdc_plane_atomic_check(struct drm_plane *plane,
+ struct drm_plane_state *state)
+{
+ struct drm_framebuffer *fb = state->fb;
+ u32 src_x, src_y, src_w, src_h;
+
+ DRM_DEBUG_DRIVER("\n");
+
+ if (!fb)
+ return 0;
+
+ /* convert src_ from 16:16 format */
+ src_x = state->src_x >> 16;
+ src_y = state->src_y >> 16;
+ src_w = state->src_w >> 16;
+ src_h = state->src_h >> 16;
+
+ /* Reject scaling */
+ if ((src_w != state->crtc_w) || (src_h != state->crtc_h)) {
+ DRM_ERROR("Scaling is not supported");
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+static void ltdc_plane_atomic_update(struct drm_plane *plane,
+ struct drm_plane_state *oldstate)
+{
+ struct ltdc_device *ldev = plane_to_ltdc(plane);
+ struct drm_plane_state *state = plane->state;
+ struct drm_framebuffer *fb = state->fb;
+ u32 lofs = plane->index * LAY_OFS;
+ u32 x0 = state->crtc_x;
+ u32 x1 = state->crtc_x + state->crtc_w - 1;
+ u32 y0 = state->crtc_y;
+ u32 y1 = state->crtc_y + state->crtc_h - 1;
+ u32 src_x, src_y, src_w, src_h;
+ u32 val, pitch_in_bytes, line_length, paddr, ahbp, avbp, bpcr;
+ enum ltdc_pix_fmt pf;
+
+ if (!state->crtc || !fb) {
+ DRM_DEBUG_DRIVER("fb or crtc NULL");
+ return;
+ }
+
+ /* convert src_ from 16:16 format */
+ src_x = state->src_x >> 16;
+ src_y = state->src_y >> 16;
+ src_w = state->src_w >> 16;
+ src_h = state->src_h >> 16;
+
+ DRM_DEBUG_DRIVER(
+ "plane:%d fb:%d (%dx%d)@(%d,%d) -> (%dx%d)@(%d,%d)\n",
+ plane->base.id, fb->base.id,
+ src_w, src_h, src_x, src_y,
+ state->crtc_w, state->crtc_h, state->crtc_x, state->crtc_y);
+
+ bpcr = reg_read(ldev->regs, LTDC_BPCR);
+ ahbp = (bpcr & BPCR_AHBP) >> 16;
+ avbp = bpcr & BPCR_AVBP;
+
+ /* Configures the horizontal start and stop position */
+ val = ((x1 + 1 + ahbp) << 16) + (x0 + 1 + ahbp);
+ reg_update_bits(ldev->regs, LTDC_L1WHPCR + lofs,
+ LXWHPCR_WHSTPOS | LXWHPCR_WHSPPOS, val);
+
+ /* Configures the vertical start and stop position */
+ val = ((y1 + 1 + avbp) << 16) + (y0 + 1 + avbp);
+ reg_update_bits(ldev->regs, LTDC_L1WVPCR + lofs,
+ LXWVPCR_WVSTPOS | LXWVPCR_WVSPPOS, val);
+
+ /* Specifies the pixel format */
+ pf = to_ltdc_pixelformat(fb->format->format);
+ for (val = 0; val < NB_PF; val++)
+ if (ldev->caps.pix_fmt_hw[val] == pf)
+ break;
+
+ if (val == NB_PF) {
+ DRM_ERROR("Pixel format %.4s not supported\n",
+ (char *)&fb->format->format);
+ val = 0; /* set by default ARGB 32 bits */
+ }
+ reg_update_bits(ldev->regs, LTDC_L1PFCR + lofs, LXPFCR_PF, val);
+
+ /* Configures the color frame buffer pitch in bytes & line length */
+ pitch_in_bytes = fb->pitches[0];
+ line_length = drm_format_plane_cpp(fb->format->format, 0) *
+ (x1 - x0 + 1) + (ldev->caps.bus_width >> 3) - 1;
+ val = ((pitch_in_bytes << 16) | line_length);
+ reg_update_bits(ldev->regs, LTDC_L1CFBLR + lofs,
+ LXCFBLR_CFBLL | LXCFBLR_CFBP, val);
+
+ /* Specifies the constant alpha value */
+ val = CONSTA_MAX;
+ reg_update_bits(ldev->regs, LTDC_L1CACR + lofs,
+ LXCACR_CONSTA, val);
+
+ /* Specifies the blending factors */
+ val = BF1_PAXCA | BF2_1PAXCA;
+ reg_update_bits(ldev->regs, LTDC_L1BFCR + lofs,
+ LXBFCR_BF2 | LXBFCR_BF1, val);
+
+ /* Configures the frame buffer line number */
+ val = y1 - y0 + 1;
+ reg_update_bits(ldev->regs, LTDC_L1CFBLNR + lofs,
+ LXCFBLNR_CFBLN, val);
+
+ /* Sets the FB address */
+ paddr = (u32)drm_fb_cma_get_gem_addr(fb, state, 0);
+
+ DRM_DEBUG_DRIVER("fb: phys 0x%08x", paddr);
+ reg_write(ldev->regs, LTDC_L1CFBAR + lofs, paddr);
+
+ /* Enable layer and CLUT if needed */
+ val = fb->format->format == DRM_FORMAT_C8 ? LXCR_CLUTEN : 0;
+ val |= LXCR_LEN;
+ reg_update_bits(ldev->regs, LTDC_L1CR + lofs,
+ LXCR_LEN | LXCR_CLUTEN, val);
+
+ mutex_lock(&ldev->err_lock);
+ if (ldev->error_status & ISR_FUIF) {
+ DRM_DEBUG_DRIVER("Fifo underrun\n");
+ ldev->error_status &= ~ISR_FUIF;
+ }
+ if (ldev->error_status & ISR_TERRIF) {
+ DRM_DEBUG_DRIVER("Transfer error\n");
+ ldev->error_status &= ~ISR_TERRIF;
+ }
+ mutex_unlock(&ldev->err_lock);
+}
+
+static void ltdc_plane_atomic_disable(struct drm_plane *plane,
+ struct drm_plane_state *oldstate)
+{
+ struct ltdc_device *ldev = plane_to_ltdc(plane);
+ u32 lofs = plane->index * LAY_OFS;
+
+ /* disable layer */
+ reg_clear(ldev->regs, LTDC_L1CR + lofs, LXCR_LEN);
+
+ DRM_DEBUG_DRIVER("CRTC:%d plane:%d\n",
+ oldstate->crtc->base.id, plane->base.id);
+}
+
+static struct drm_plane_funcs ltdc_plane_funcs = {
+ .update_plane = drm_atomic_helper_update_plane,
+ .disable_plane = drm_atomic_helper_disable_plane,
+ .destroy = drm_plane_cleanup,
+ .set_property = drm_atomic_helper_plane_set_property,
+ .reset = drm_atomic_helper_plane_reset,
+ .atomic_duplicate_state = drm_atomic_helper_plane_duplicate_state,
+ .atomic_destroy_state = drm_atomic_helper_plane_destroy_state,
+};
+
+static const struct drm_plane_helper_funcs ltdc_plane_helper_funcs = {
+ .atomic_check = ltdc_plane_atomic_check,
+ .atomic_update = ltdc_plane_atomic_update,
+ .atomic_disable = ltdc_plane_atomic_disable,
+};
+
+static struct drm_plane *ltdc_plane_create(struct drm_device *ddev,
+ enum drm_plane_type type)
+{
+ unsigned long possible_crtcs = CRTC_MASK;
+ struct ltdc_device *ldev = ddev->dev_private;
+ struct device *dev = ddev->dev;
+ struct drm_plane *plane;
+ unsigned int i, nb_fmt = 0;
+ u32 formats[NB_PF];
+ u32 drm_fmt;
+ int ret;
+
+ /* Get supported pixel formats */
+ for (i = 0; i < NB_PF; i++) {
+ drm_fmt = to_drm_pixelformat(ldev->caps.pix_fmt_hw[i]);
+ if (!drm_fmt)
+ continue;
+ formats[nb_fmt++] = drm_fmt;
+ }
+
+ plane = devm_kzalloc(dev, sizeof(*plane), GFP_KERNEL);
+ if (!plane)
+ return 0;
+
+ ret = drm_universal_plane_init(ddev, plane, possible_crtcs,
+ &ltdc_plane_funcs, formats, nb_fmt,
+ type, NULL);
+ if (ret < 0)
+ return 0;
+
+ drm_plane_helper_add(plane, &ltdc_plane_helper_funcs);
+
+ DRM_DEBUG_DRIVER("plane:%d created\n", plane->base.id);
+
+ return plane;
+}
+
+static void ltdc_plane_destroy_all(struct drm_device *ddev)
+{
+ struct drm_plane *plane, *plane_temp;
+
+ list_for_each_entry_safe(plane, plane_temp,
+ &ddev->mode_config.plane_list, head)
+ drm_plane_cleanup(plane);
+}
+
+static int ltdc_crtc_init(struct drm_device *ddev, struct drm_crtc *crtc)
+{
+ struct ltdc_device *ldev = ddev->dev_private;
+ struct drm_plane *primary, *overlay;
+ unsigned int i;
+ int res;
+
+ primary = ltdc_plane_create(ddev, DRM_PLANE_TYPE_PRIMARY);
+ if (!primary) {
+ DRM_ERROR("Can not create primary plane\n");
+ return -EINVAL;
+ }
+
+ res = drm_crtc_init_with_planes(ddev, crtc, primary, NULL,
+ &ltdc_crtc_funcs, NULL);
+ if (res) {
+ DRM_ERROR("Can not initialize CRTC\n");
+ goto cleanup;
+ }
+
+ drm_crtc_helper_add(crtc, &ltdc_crtc_helper_funcs);
+
+ DRM_DEBUG_DRIVER("CRTC:%d created\n", crtc->base.id);
+
+ /* Add planes. Note : the first layer is used by primary plane */
+ for (i = 1; i < ldev->caps.nb_layers; i++) {
+ overlay = ltdc_plane_create(ddev, DRM_PLANE_TYPE_OVERLAY);
+ if (!overlay) {
+ res = -ENOMEM;
+ DRM_ERROR("Can not create overlay plane %d\n", i);
+ goto cleanup;
+ }
+ }
+
+ return 0;
+
+cleanup:
+ ltdc_plane_destroy_all(ddev);
+ return res;
+}
+
+/*
+ * DRM_ENCODER
+ */
+
+static void ltdc_rgb_encoder_enable(struct drm_encoder *encoder)
+{
+ struct ltdc_device *ldev = encoder_to_ltdc(encoder);
+
+ DRM_DEBUG_DRIVER("\n");
+
+ drm_panel_prepare(ldev->panel);
+ drm_panel_enable(ldev->panel);
+}
+
+static void ltdc_rgb_encoder_disable(struct drm_encoder *encoder)
+{
+ struct ltdc_device *ldev = encoder_to_ltdc(encoder);
+
+ DRM_DEBUG_DRIVER("\n");
+
+ drm_panel_disable(ldev->panel);
+ drm_panel_unprepare(ldev->panel);
+}
+
+static const struct drm_encoder_helper_funcs ltdc_rgb_encoder_helper_funcs = {
+ .enable = ltdc_rgb_encoder_enable,
+ .disable = ltdc_rgb_encoder_disable,
+};
+
+static const struct drm_encoder_funcs ltdc_rgb_encoder_funcs = {
+ .destroy = drm_encoder_cleanup,
+};
+
+static struct drm_encoder *ltdc_rgb_encoder_create(struct drm_device *ddev)
+{
+ struct drm_encoder *encoder;
+
+ encoder = devm_kzalloc(ddev->dev, sizeof(*encoder), GFP_KERNEL);
+ if (!encoder)
+ return NULL;
+
+ encoder->possible_crtcs = CRTC_MASK;
+ encoder->possible_clones = 0; /* No cloning support */
+
+ drm_encoder_init(ddev, encoder, &ltdc_rgb_encoder_funcs,
+ DRM_MODE_ENCODER_LVDS, NULL);
+
+ drm_encoder_helper_add(encoder, &ltdc_rgb_encoder_helper_funcs);
+
+ DRM_DEBUG_DRIVER("RGB encoder:%d created\n", encoder->base.id);
+
+ return encoder;
+}
+
+static struct drm_encoder *ltdc_rgb_encoder_find(struct drm_device *ddev)
+{
+ struct drm_encoder *encoder;
+
+ list_for_each_entry(encoder, &ddev->mode_config.encoder_list, head) {
+ if (encoder->encoder_type == DRM_MODE_ENCODER_LVDS)
+ return encoder;
+ }
+
+ return NULL;
+}
+
+static int ltdc_create_encoders(struct drm_device *ddev)
+{
+ struct ltdc_device *ldev = ddev->dev_private;
+ struct drm_encoder *encoder;
+
+ DRM_DEBUG_DRIVER("\n");
+
+ if (ldev->panel) {
+ encoder = ltdc_rgb_encoder_create(ddev);
+ if (!encoder)
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+/*
+ * DRM_CONNECTOR
+ */
+
+static int ltdc_rgb_connector_get_modes(struct drm_connector *connector)
+{
+ struct drm_device *ddev = connector->dev;
+ struct ltdc_device *ldev = ddev->dev_private;
+ int ret = 0;
+
+ DRM_DEBUG_DRIVER("\n");
+
+ if (ldev->panel)
+ ret = drm_panel_get_modes(ldev->panel);
+
+ return ret < 0 ? 0 : ret;
+}
+
+static struct drm_connector_helper_funcs ltdc_rgb_connector_helper_funcs = {
+ .get_modes = ltdc_rgb_connector_get_modes,
+};
+
+static enum drm_connector_status
+ltdc_rgb_connector_detect(struct drm_connector *connector, bool force)
+{
+ struct ltdc_device *ldev = connector_to_ltdc(connector);
+
+ return ldev->panel ? connector_status_connected :
+ connector_status_disconnected;
+}
+
+static void ltdc_rgb_connector_destroy(struct drm_connector *connector)
+{
+ DRM_DEBUG_DRIVER("\n");
+
+ drm_connector_unregister(connector);
+ drm_connector_cleanup(connector);
+}
+
+static const struct drm_connector_funcs ltdc_rgb_connector_funcs = {
+ .dpms = drm_atomic_helper_connector_dpms,
+ .fill_modes = drm_helper_probe_single_connector_modes,
+ .detect = ltdc_rgb_connector_detect,
+ .destroy = ltdc_rgb_connector_destroy,
+ .reset = drm_atomic_helper_connector_reset,
+ .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
+ .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
+};
+
+struct drm_connector *ltdc_rgb_connector_create(struct drm_device *ddev)
+{
+ struct drm_connector *connector;
+ int err;
+
+ connector = devm_kzalloc(ddev->dev, sizeof(*connector), GFP_KERNEL);
+ if (!connector) {
+ DRM_ERROR("Failed to allocate connector\n");
+ return NULL;
+ }
+
+ connector->polled = DRM_CONNECTOR_POLL_HPD;
+
+ err = drm_connector_init(ddev, connector, &ltdc_rgb_connector_funcs,
+ DRM_MODE_CONNECTOR_LVDS);
+ if (err) {
+ DRM_ERROR("Failed to initialize connector\n");
+ return NULL;
+ }
+
+ drm_connector_helper_add(connector, &ltdc_rgb_connector_helper_funcs);
+
+ DRM_DEBUG_DRIVER("RGB connector:%d created\n", connector->base.id);
+
+ return connector;
+}
+
+static int ltdc_get_caps(struct drm_device *ddev)
+{
+ struct ltdc_device *ldev = ddev->dev_private;
+ u32 bus_width_log2, lcr, gc2r;
+
+ /* at least 1 layer must be managed */
+ lcr = reg_read(ldev->regs, LTDC_LCR);
+
+ ldev->caps.nb_layers = max_t(int, lcr, 1);
+
+ /* set data bus width */
+ gc2r = reg_read(ldev->regs, LTDC_GC2R);
+ bus_width_log2 = (gc2r & GC2R_BW) >> 4;
+ ldev->caps.bus_width = 8 << bus_width_log2;
+ ldev->caps.hw_version = reg_read(ldev->regs, LTDC_IDR);
+
+ switch (ldev->caps.hw_version) {
+ case HWVER_10200:
+ case HWVER_10300:
+ ldev->caps.reg_ofs = REG_OFS_NONE;
+ ldev->caps.pix_fmt_hw = ltdc_pix_fmt_a0;
+ break;
+ case HWVER_20101:
+ ldev->caps.reg_ofs = REG_OFS_4;
+ ldev->caps.pix_fmt_hw = ltdc_pix_fmt_a1;
+ break;
+ default:
+ return -ENODEV;
+ }
+
+ return 0;
+}
+
+static struct drm_panel *ltdc_get_panel(struct drm_device *ddev)
+{
+ struct device *dev = ddev->dev;
+ struct device_node *np = dev->of_node;
+ struct device_node *entity, *port = NULL;
+ struct drm_panel *panel = NULL;
+
+ DRM_DEBUG_DRIVER("\n");
+
+ /*
+ * Parse ltdc node to get remote port and find RGB panel / HDMI slave
+ * If a dsi or a bridge (hdmi, lvds...) is connected to ltdc,
+ * a remote port & RGB panel will not be found.
+ */
+ for_each_endpoint_of_node(np, entity) {
+ if (!of_device_is_available(entity))
+ continue;
+
+ port = of_graph_get_remote_port_parent(entity);
+ if (port) {
+ panel = of_drm_find_panel(port);
+ of_node_put(port);
+ if (panel) {
+ DRM_DEBUG_DRIVER("remote panel %s\n",
+ port->full_name);
+ } else {
+ DRM_DEBUG_DRIVER("panel missing\n");
+ of_node_put(entity);
+ }
+ }
+ }
+
+ return panel;
+}
+
+int ltdc_load(struct drm_device *ddev)
+{
+ struct platform_device *pdev = to_platform_device(ddev->dev);
+ struct ltdc_device *ldev = ddev->dev_private;
+ struct device *dev = ddev->dev;
+ struct device_node *np = dev->of_node;
+ struct drm_encoder *encoder;
+ struct drm_connector *connector = NULL;
+ struct drm_crtc *crtc;
+ struct reset_control *rstc;
+ struct resource res;
+ int irq, ret, i;
+
+ DRM_DEBUG_DRIVER("\n");
+
+ ldev->panel = ltdc_get_panel(ddev);
+ if (!ldev->panel)
+ return -EPROBE_DEFER;
+
+ rstc = of_reset_control_get(np, NULL);
+
+ mutex_init(&ldev->err_lock);
+
+ ldev->pixel_clk = devm_clk_get(dev, "lcd");
+ if (IS_ERR(ldev->pixel_clk)) {
+ DRM_ERROR("Unable to get lcd clock\n");
+ return -ENODEV;
+ }
+
+ if (clk_prepare_enable(ldev->pixel_clk)) {
+ DRM_ERROR("Unable to prepare pixel clock\n");
+ return -ENODEV;
+ }
+
+ if (of_address_to_resource(np, 0, &res)) {
+ DRM_ERROR("Unable to get resource\n");
+ return -ENODEV;
+ }
+
+ ldev->regs = devm_ioremap_resource(dev, &res);
+ if (IS_ERR(ldev->regs)) {
+ DRM_ERROR("Unable to get ltdc registers\n");
+ return PTR_ERR(ldev->regs);
+ }
+
+ for (i = 0; i < MAX_IRQ; i++) {
+ irq = platform_get_irq(pdev, i);
+ if (irq < 0)
+ continue;
+
+ ret = devm_request_threaded_irq(dev, irq, ltdc_irq,
+ ltdc_irq_thread, IRQF_ONESHOT,
+ dev_name(dev), ddev);
+ if (ret) {
+ DRM_ERROR("Failed to register LTDC interrupt\n");
+ return ret;
+ }
+ }
+
+ if (!IS_ERR(rstc))
+ reset_control_deassert(rstc);
+
+ /* Disable interrupts */
+ reg_clear(ldev->regs, LTDC_IER,
+ IER_LIE | IER_RRIE | IER_FUIE | IER_TERRIE);
+
+ ret = ltdc_get_caps(ddev);
+ if (ret) {
+ DRM_ERROR("hardware identifier (0x%08x) not supported!\n",
+ ldev->caps.hw_version);
+ return ret;
+ }
+
+ DRM_INFO("ltdc hw version 0x%08x - ready\n", ldev->caps.hw_version);
+
+ if (ltdc_create_encoders(ddev)) {
+ DRM_ERROR("Failed to create encoders\n");
+ return -EINVAL;
+ }
+
+ if (ldev->panel) {
+ encoder = ltdc_rgb_encoder_find(ddev);
+ if (!encoder) {
+ DRM_ERROR("Failed to find RGB encoder\n");
+ ret = -EINVAL;
+ goto err;
+ }
+
+ connector = ltdc_rgb_connector_create(ddev);
+ if (!connector) {
+ DRM_ERROR("Failed to create RGB connector\n");
+ ret = -EINVAL;
+ goto err;
+ }
+
+ ret = drm_mode_connector_attach_encoder(connector, encoder);
+ if (ret) {
+ DRM_ERROR("Failed to attach connector to encoder\n");
+ goto err;
+ }
+
+ drm_panel_attach(ldev->panel, connector);
+ }
+
+ crtc = devm_kzalloc(dev, sizeof(*crtc), GFP_KERNEL);
+ if (!crtc) {
+ DRM_ERROR("Failed to allocate crtc\n");
+ ret = -ENOMEM;
+ goto err;
+ }
+
+ ret = ltdc_crtc_init(ddev, crtc);
+ if (ret) {
+ DRM_ERROR("Failed to init crtc\n");
+ goto err;
+ }
+
+ ret = drm_vblank_init(ddev, NB_CRTC);
+ if (ret) {
+ DRM_ERROR("Failed calling drm_vblank_init()\n");
+ goto err;
+ }
+
+ /* Allow usage of vblank without having to call drm_irq_install */
+ ddev->irq_enabled = 1;
+
+ return 0;
+err:
+ if (ldev->panel)
+ drm_panel_detach(ldev->panel);
+
+ clk_disable_unprepare(ldev->pixel_clk);
+
+ return ret;
+}
+
+void ltdc_unload(struct drm_device *ddev)
+{
+ struct ltdc_device *ldev = ddev->dev_private;
+
+ DRM_DEBUG_DRIVER("\n");
+
+ drm_vblank_cleanup(ddev);
+
+ if (ldev->panel)
+ drm_panel_detach(ldev->panel);
+
+ clk_disable_unprepare(ldev->pixel_clk);
+}
+
+MODULE_AUTHOR("Philippe Cornu <philippe.cornu@st.com>");
+MODULE_AUTHOR("Yannick Fertre <yannick.fertre@st.com>");
+MODULE_AUTHOR("Fabien Dessenne <fabien.dessenne@st.com>");
+MODULE_AUTHOR("Mickael Reulier <mickael.reulier@st.com>");
+MODULE_DESCRIPTION("STMicroelectronics ST DRM LTDC driver");
+MODULE_LICENSE("GPL v2");
diff --git a/drivers/gpu/drm/stm/ltdc.h b/drivers/gpu/drm/stm/ltdc.h
new file mode 100644
index 0000000..d7a9c73
--- /dev/null
+++ b/drivers/gpu/drm/stm/ltdc.h
@@ -0,0 +1,40 @@
+/*
+ * Copyright (C) STMicroelectronics SA 2017
+ *
+ * Authors: Philippe Cornu <philippe.cornu@st.com>
+ * Yannick Fertre <yannick.fertre@st.com>
+ * Fabien Dessenne <fabien.dessenne@st.com>
+ * Mickael Reulier <mickael.reulier@st.com>
+ *
+ * License terms: GNU General Public License (GPL), version 2
+ */
+
+#ifndef _LTDC_H_
+#define _LTDC_H_
+
+struct ltdc_caps {
+ u32 hw_version; /* hardware version */
+ u32 nb_layers; /* number of supported layers */
+ u32 reg_ofs; /* register offset for applicable regs */
+ u32 bus_width; /* bus width (32 or 64 bits) */
+ const u32 *pix_fmt_hw; /* supported pixel formats */
+};
+
+struct ltdc_device {
+ struct drm_fbdev_cma *fbdev;
+ void __iomem *regs;
+ struct clk *pixel_clk; /* lcd pixel clock */
+ struct drm_panel *panel;
+ struct mutex err_lock; /* protecting error_status */
+ struct ltdc_caps caps;
+ u32 clut[256]; /* color look up table */
+ u32 error_status;
+ u32 irq_status;
+};
+
+int ltdc_crtc_enable_vblank(struct drm_device *dev, unsigned int pipe);
+void ltdc_crtc_disable_vblank(struct drm_device *dev, unsigned int pipe);
+int ltdc_load(struct drm_device *ddev);
+void ltdc_unload(struct drm_device *ddev);
+
+#endif
--
1.9.1