Commit b759012c authored by Yannick Fertre's avatar Yannick Fertre Committed by Eric Anholt

drm/stm: Add STM32 LTDC driver

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.
Reviewed-by: default avatarEric Anholt <eric@anholt.net>
Signed-off-by: default avatarYannick Fertre <yannick.fertre@st.com>
Signed-off-by: default avatarEric Anholt <eric@anholt.net>
Link: http://patchwork.freedesktop.org/patch/msgid/1492164819-10513-5-git-send-email-yannick.fertre@st.comReviewed-by: default avatarNeil Armstrong <narmstrong@baylibre.com>
Reviewed-by: default avatarEric Anholt <eric@anholt.net>
parent 7121926d
...@@ -246,6 +246,8 @@ source "drivers/gpu/drm/fsl-dcu/Kconfig" ...@@ -246,6 +246,8 @@ source "drivers/gpu/drm/fsl-dcu/Kconfig"
source "drivers/gpu/drm/tegra/Kconfig" source "drivers/gpu/drm/tegra/Kconfig"
source "drivers/gpu/drm/stm/Kconfig"
source "drivers/gpu/drm/panel/Kconfig" source "drivers/gpu/drm/panel/Kconfig"
source "drivers/gpu/drm/bridge/Kconfig" source "drivers/gpu/drm/bridge/Kconfig"
......
...@@ -82,6 +82,7 @@ obj-$(CONFIG_DRM_BOCHS) += bochs/ ...@@ -82,6 +82,7 @@ obj-$(CONFIG_DRM_BOCHS) += bochs/
obj-$(CONFIG_DRM_VIRTIO_GPU) += virtio/ obj-$(CONFIG_DRM_VIRTIO_GPU) += virtio/
obj-$(CONFIG_DRM_MSM) += msm/ obj-$(CONFIG_DRM_MSM) += msm/
obj-$(CONFIG_DRM_TEGRA) += tegra/ obj-$(CONFIG_DRM_TEGRA) += tegra/
obj-$(CONFIG_DRM_STM) += stm/
obj-$(CONFIG_DRM_STI) += sti/ obj-$(CONFIG_DRM_STI) += sti/
obj-$(CONFIG_DRM_IMX) += imx/ obj-$(CONFIG_DRM_IMX) += imx/
obj-$(CONFIG_DRM_MEDIATEK) += mediatek/ obj-$(CONFIG_DRM_MEDIATEK) += mediatek/
......
config DRM_STM
tristate "DRM Support for STMicroelectronics SoC Series"
depends on DRM && (ARCH_STM32 || ARCH_MULTIPLATFORM)
select DRM_KMS_HELPER
select DRM_GEM_CMA_HELPER
select DRM_KMS_CMA_HELPER
select DRM_PANEL
select VIDEOMODE_HELPERS
select FB_PROVIDE_GET_FB_UNMAPPED_AREA
default y
help
Enable support for the on-chip display controller on
STMicroelectronics STM32 MCUs.
To compile this driver as a module, choose M here: the module
will be called stm-drm.
ccflags-y := -Iinclude/drm
stm-drm-y := \
drv.o \
ltdc.o
obj-$(CONFIG_DRM_STM) += stm-drm.o
/*
* 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");
/*
* 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);
DRM_DEBUG_DRIVER("\n");
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);
}
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_DPI, NULL);
drm_encoder_helper_add(encoder, &ltdc_rgb_encoder_helper_funcs);
DRM_DEBUG_DRIVER("RGB encoder:%d created\n", encoder->base.id);
return encoder;
}
/*
* 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_DPI);
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 (ldev->panel) {
encoder = ltdc_rgb_encoder_create(ddev);
if (!encoder) {
DRM_ERROR("Failed to create 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");
/*
* 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
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