mirror of https://github.com/hak5/openwrt.git
577 lines
16 KiB
Diff
577 lines
16 KiB
Diff
From a28a55876fa9df72d7e3c1bc0fc2ea4bd65337f0 Mon Sep 17 00:00:00 2001
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From: Eric Anholt <eric@anholt.net>
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Date: Tue, 26 Apr 2016 13:46:13 -0700
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Subject: [PATCH 126/454] drm/panel: Add support for the Raspberry Pi 7"
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Touchscreen.
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This driver communicates with the Atmel microcontroller for sequencing
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the poweron of the TC358762 DSI-DPI bridge and controlling the
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backlight PWM.
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The following lines are required in config.txt, to keep the firmware
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from trying to bash our I2C lines and steal the DSI interrupts:
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disable_touchscreen=1
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ignore_lcd=2
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mask_gpu_interrupt1=0x1000
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This means that the firmware won't power on the panel at boot time (no
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rainbow) and the touchscreen input won't work. The native input
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driver for the touchscreen still needs to be written.
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v2: Set the same default orientation as the closed source firmware
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used, which is the best for viewing angle.
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Signed-off-by: Eric Anholt <eric@anholt.net>
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---
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drivers/gpu/drm/panel/Kconfig | 8 +
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drivers/gpu/drm/panel/Makefile | 1 +
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.../drm/panel/panel-raspberrypi-touchscreen.c | 514 ++++++++++++++++++
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3 files changed, 523 insertions(+)
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create mode 100644 drivers/gpu/drm/panel/panel-raspberrypi-touchscreen.c
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--- a/drivers/gpu/drm/panel/Kconfig
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+++ b/drivers/gpu/drm/panel/Kconfig
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@@ -73,6 +73,14 @@ config DRM_PANEL_PANASONIC_VVX10F034N00
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WUXGA (1920x1200) Novatek NT1397-based DSI panel as found in some
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Xperia Z2 tablets
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+config DRM_PANEL_RASPBERRYPI_TOUCHSCREEN
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+ tristate "Raspberry Pi 7-inch touchscreen panel"
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+ depends on DRM_MIPI_DSI
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+ help
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+ Say Y here if you want to enable support for the Raspberry
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+ Pi 7" Touchscreen. To compile this driver as a module,
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+ choose M here.
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+
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config DRM_PANEL_SAMSUNG_S6E3HA2
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tristate "Samsung S6E3HA2 DSI video mode panel"
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depends on OF
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--- a/drivers/gpu/drm/panel/Makefile
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+++ b/drivers/gpu/drm/panel/Makefile
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@@ -5,6 +5,7 @@ obj-$(CONFIG_DRM_PANEL_INNOLUX_P079ZCA)
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obj-$(CONFIG_DRM_PANEL_JDI_LT070ME05000) += panel-jdi-lt070me05000.o
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obj-$(CONFIG_DRM_PANEL_LG_LG4573) += panel-lg-lg4573.o
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obj-$(CONFIG_DRM_PANEL_PANASONIC_VVX10F034N00) += panel-panasonic-vvx10f034n00.o
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+obj-$(CONFIG_DRM_PANEL_RASPBERRYPI_TOUCHSCREEN) += panel-raspberrypi-touchscreen.o
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obj-$(CONFIG_DRM_PANEL_SAMSUNG_LD9040) += panel-samsung-ld9040.o
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obj-$(CONFIG_DRM_PANEL_SAMSUNG_S6E3HA2) += panel-samsung-s6e3ha2.o
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obj-$(CONFIG_DRM_PANEL_SAMSUNG_S6E8AA0) += panel-samsung-s6e8aa0.o
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--- /dev/null
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+++ b/drivers/gpu/drm/panel/panel-raspberrypi-touchscreen.c
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@@ -0,0 +1,514 @@
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+/*
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+ * Copyright © 2016 Broadcom
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+ *
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+ * This program is free software; you can redistribute it and/or modify
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+ * it under the terms of the GNU General Public License version 2 as
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+ * published by the Free Software Foundation.
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+ *
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+ * Portions of this file (derived from panel-simple.c) are:
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+ *
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+ * Copyright (C) 2013, NVIDIA Corporation. All rights reserved.
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+ *
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+ * Permission is hereby granted, free of charge, to any person obtaining a
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+ * copy of this software and associated documentation files (the "Software"),
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+ * to deal in the Software without restriction, including without limitation
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+ * the rights to use, copy, modify, merge, publish, distribute, sub license,
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+ * and/or sell copies of the Software, and to permit persons to whom the
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+ * Software is furnished to do so, subject to the following conditions:
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+ *
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+ * The above copyright notice and this permission notice (including the
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+ * next paragraph) shall be included in all copies or substantial portions
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+ * of the Software.
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+ *
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+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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+ * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
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+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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+ * DEALINGS IN THE SOFTWARE.
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+ */
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+
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+/**
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+ * DOC: Raspberry Pi 7" touchscreen panel driver.
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+ *
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+ * The 7" touchscreen consists of a DPI LCD panel, a Toshiba
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+ * TC358762XBG DSI-DPI bridge, and an I2C-connected Atmel ATTINY88-MUR
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+ * controlling power management, the LCD PWM, and the touchscreen.
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+ *
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+ * This driver presents this device as a MIPI DSI panel to the DRM
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+ * driver, and should expose the touchscreen as a HID device.
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+ */
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+
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+#include <linux/delay.h>
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+#include <linux/err.h>
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+#include <linux/fb.h>
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+#include <linux/gpio.h>
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+#include <linux/gpio/consumer.h>
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+#include <linux/i2c.h>
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+#include <linux/module.h>
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+#include <linux/of.h>
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+#include <linux/of_device.h>
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+#include <linux/of_graph.h>
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+#include <linux/pm.h>
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+
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+#include <drm/drm_panel.h>
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+#include <drm/drmP.h>
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+#include <drm/drm_crtc.h>
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+#include <drm/drm_mipi_dsi.h>
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+#include <drm/drm_panel.h>
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+
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+/* I2C registers of the Atmel microcontroller. */
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+enum REG_ADDR {
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+ REG_ID = 0x80,
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+ REG_PORTA, // BIT(2) for horizontal flip, BIT(3) for vertical flip
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+ REG_PORTB,
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+ REG_PORTC,
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+ REG_PORTD,
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+ REG_POWERON,
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+ REG_PWM,
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+ REG_DDRA,
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+ REG_DDRB,
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+ REG_DDRC,
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+ REG_DDRD,
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+ REG_TEST,
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+ REG_WR_ADDRL,
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+ REG_WR_ADDRH,
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+ REG_READH,
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+ REG_READL,
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+ REG_WRITEH,
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+ REG_WRITEL,
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+ REG_ID2,
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+};
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+
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+/* We only turn the PWM on or off, without varying values. */
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+#define RPI_TOUCHSCREEN_MAX_BRIGHTNESS 1
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+
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+/* DSI D-PHY Layer Registers */
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+#define D0W_DPHYCONTTX 0x0004
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+#define CLW_DPHYCONTRX 0x0020
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+#define D0W_DPHYCONTRX 0x0024
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+#define D1W_DPHYCONTRX 0x0028
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+#define COM_DPHYCONTRX 0x0038
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+#define CLW_CNTRL 0x0040
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+#define D0W_CNTRL 0x0044
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+#define D1W_CNTRL 0x0048
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+#define DFTMODE_CNTRL 0x0054
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+
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+/* DSI PPI Layer Registers */
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+#define PPI_STARTPPI 0x0104
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+#define PPI_BUSYPPI 0x0108
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+#define PPI_LINEINITCNT 0x0110
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+#define PPI_LPTXTIMECNT 0x0114
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+//#define PPI_LANEENABLE 0x0134
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+//#define PPI_TX_RX_TA 0x013C
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+#define PPI_CLS_ATMR 0x0140
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+#define PPI_D0S_ATMR 0x0144
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+#define PPI_D1S_ATMR 0x0148
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+#define PPI_D0S_CLRSIPOCOUNT 0x0164
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+#define PPI_D1S_CLRSIPOCOUNT 0x0168
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+#define CLS_PRE 0x0180
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+#define D0S_PRE 0x0184
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+#define D1S_PRE 0x0188
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+#define CLS_PREP 0x01A0
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+#define D0S_PREP 0x01A4
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+#define D1S_PREP 0x01A8
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+#define CLS_ZERO 0x01C0
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+#define D0S_ZERO 0x01C4
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+#define D1S_ZERO 0x01C8
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+#define PPI_CLRFLG 0x01E0
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+#define PPI_CLRSIPO 0x01E4
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+#define HSTIMEOUT 0x01F0
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+#define HSTIMEOUTENABLE 0x01F4
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+
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+/* DSI Protocol Layer Registers */
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+#define DSI_STARTDSI 0x0204
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+#define DSI_BUSYDSI 0x0208
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+#define DSI_LANEENABLE 0x0210
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+# define DSI_LANEENABLE_CLOCK BIT(0)
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+# define DSI_LANEENABLE_D0 BIT(1)
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+# define DSI_LANEENABLE_D1 BIT(2)
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+
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+#define DSI_LANESTATUS0 0x0214
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+#define DSI_LANESTATUS1 0x0218
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+#define DSI_INTSTATUS 0x0220
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+#define DSI_INTMASK 0x0224
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+#define DSI_INTCLR 0x0228
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+#define DSI_LPTXTO 0x0230
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+#define DSI_MODE 0x0260
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+#define DSI_PAYLOAD0 0x0268
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+#define DSI_PAYLOAD1 0x026C
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+#define DSI_SHORTPKTDAT 0x0270
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+#define DSI_SHORTPKTREQ 0x0274
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+#define DSI_BTASTA 0x0278
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+#define DSI_BTACLR 0x027C
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+
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+/* DSI General Registers */
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+#define DSIERRCNT 0x0300
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+#define DSISIGMOD 0x0304
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+
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+/* DSI Application Layer Registers */
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+#define APLCTRL 0x0400
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+#define APLSTAT 0x0404
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+#define APLERR 0x0408
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+#define PWRMOD 0x040C
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+#define RDPKTLN 0x0410
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+#define PXLFMT 0x0414
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+#define MEMWRCMD 0x0418
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+
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+/* LCDC/DPI Host Registers */
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+#define LCDCTRL 0x0420
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+#define HSR 0x0424
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+#define HDISPR 0x0428
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+#define VSR 0x042C
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+#define VDISPR 0x0430
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+#define VFUEN 0x0434
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+
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+/* DBI-B Host Registers */
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+#define DBIBCTRL 0x0440
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+
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+/* SPI Master Registers */
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+#define SPICMR 0x0450
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+#define SPITCR 0x0454
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+
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+/* System Controller Registers */
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+#define SYSSTAT 0x0460
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+#define SYSCTRL 0x0464
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+#define SYSPLL1 0x0468
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+#define SYSPLL2 0x046C
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+#define SYSPLL3 0x0470
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+#define SYSPMCTRL 0x047C
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+
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+/* GPIO Registers */
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+#define GPIOC 0x0480
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+#define GPIOO 0x0484
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+#define GPIOI 0x0488
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+
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+/* I2C Registers */
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+#define I2CCLKCTRL 0x0490
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+
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+/* Chip/Rev Registers */
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+#define IDREG 0x04A0
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+
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+/* Debug Registers */
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+#define WCMDQUEUE 0x0500
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+#define RCMDQUEUE 0x0504
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+
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+struct rpi_touchscreen {
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+ struct drm_panel base;
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+ struct mipi_dsi_device *dsi;
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+ struct i2c_client *bridge_i2c;
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+
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+ /* Version of the firmware on the bridge chip */
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+ int atmel_ver;
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+};
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+
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+static const struct drm_display_mode rpi_touchscreen_modes[] = {
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+ {
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+ /* The DSI PLL can only integer divide from the 2Ghz
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+ * PLLD, giving us few choices. We pick a divide by 3
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+ * as our DSI HS clock, giving us a pixel clock of
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+ * that divided by 24 bits. Pad out HFP to get our
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+ * panel to refresh at 60Hz, even if that doesn't
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+ * match the datasheet.
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+ */
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+#define PIXEL_CLOCK ((2000000000 / 3) / 24)
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+#define VREFRESH 60
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+#define VTOTAL (480 + 7 + 2 + 21)
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+#define HACT 800
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+#define HSW 2
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+#define HBP 46
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+#define HFP ((PIXEL_CLOCK / (VTOTAL * VREFRESH)) - (HACT + HSW + HBP))
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+
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+ .clock = PIXEL_CLOCK / 1000,
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+ .hdisplay = HACT,
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+ .hsync_start = HACT + HFP,
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+ .hsync_end = HACT + HFP + HSW,
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+ .htotal = HACT + HFP + HSW + HBP,
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+ .vdisplay = 480,
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+ .vsync_start = 480 + 7,
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+ .vsync_end = 480 + 7 + 2,
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+ .vtotal = VTOTAL,
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+ .vrefresh = 60,
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+ },
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+};
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+
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+static struct rpi_touchscreen *panel_to_ts(struct drm_panel *panel)
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+{
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+ return container_of(panel, struct rpi_touchscreen, base);
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+}
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+
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+static u8 rpi_touchscreen_i2c_read(struct rpi_touchscreen *ts, u8 reg)
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+{
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+ return i2c_smbus_read_byte_data(ts->bridge_i2c, reg);
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+}
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+
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+static void rpi_touchscreen_i2c_write(struct rpi_touchscreen *ts,
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+ u8 reg, u8 val)
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+{
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+ int ret;
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+
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+ ret = i2c_smbus_write_byte_data(ts->bridge_i2c, reg, val);
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+ if (ret)
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+ dev_err(&ts->dsi->dev, "I2C write failed: %d\n", ret);
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+}
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+
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+static int rpi_touchscreen_write(struct rpi_touchscreen *ts, u16 reg, u32 val)
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+{
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+#if 0
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+ /* The firmware uses LP DSI transactions like this to bring up
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+ * the hardware, which should be faster than using I2C to then
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+ * pass to the Toshiba. However, I was unable to get it to
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+ * work.
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+ */
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+ u8 msg[] = {
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+ reg,
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+ reg >> 8,
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+ val,
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+ val >> 8,
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+ val >> 16,
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+ val >> 24,
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+ };
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+
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+ mipi_dsi_dcs_write_buffer(ts->dsi, msg, sizeof(msg));
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+#else
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+ rpi_touchscreen_i2c_write(ts, REG_WR_ADDRH, reg >> 8);
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+ rpi_touchscreen_i2c_write(ts, REG_WR_ADDRL, reg);
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+ rpi_touchscreen_i2c_write(ts, REG_WRITEH, val >> 8);
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+ rpi_touchscreen_i2c_write(ts, REG_WRITEL, val);
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+#endif
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+
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+ return 0;
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+}
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+
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+static int rpi_touchscreen_disable(struct drm_panel *panel)
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+{
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+ struct rpi_touchscreen *ts = panel_to_ts(panel);
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+
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+ rpi_touchscreen_i2c_write(ts, REG_PWM, 0);
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+
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+ rpi_touchscreen_i2c_write(ts, REG_POWERON, 0);
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+ udelay(1);
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+
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+ return 0;
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+}
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+
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+static int rpi_touchscreen_noop(struct drm_panel *panel)
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+{
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+ return 0;
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+}
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+
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+static int rpi_touchscreen_enable(struct drm_panel *panel)
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+{
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+ struct rpi_touchscreen *ts = panel_to_ts(panel);
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+ int i;
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+
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+ rpi_touchscreen_i2c_write(ts, REG_POWERON, 1);
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+ /* Wait for nPWRDWN to go low to indicate poweron is done. */
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+ for (i = 0; i < 100; i++) {
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+ if (rpi_touchscreen_i2c_read(ts, REG_PORTB) & 1)
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+ break;
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+ }
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+
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+ rpi_touchscreen_write(ts, DSI_LANEENABLE,
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+ DSI_LANEENABLE_CLOCK |
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+ DSI_LANEENABLE_D0 |
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+ (ts->dsi->lanes > 1 ? DSI_LANEENABLE_D1 : 0));
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+ rpi_touchscreen_write(ts, PPI_D0S_CLRSIPOCOUNT, 0x05);
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+ rpi_touchscreen_write(ts, PPI_D1S_CLRSIPOCOUNT, 0x05);
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+ rpi_touchscreen_write(ts, PPI_D0S_ATMR, 0x00);
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+ rpi_touchscreen_write(ts, PPI_D1S_ATMR, 0x00);
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+ rpi_touchscreen_write(ts, PPI_LPTXTIMECNT, 0x03);
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+
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+ rpi_touchscreen_write(ts, SPICMR, 0x00);
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+ rpi_touchscreen_write(ts, LCDCTRL, 0x00100150);
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+ rpi_touchscreen_write(ts, SYSCTRL, 0x040f);
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+ msleep(100);
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+
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+ rpi_touchscreen_write(ts, PPI_STARTPPI, 0x01);
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+ rpi_touchscreen_write(ts, DSI_STARTDSI, 0x01);
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+ msleep(100);
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+
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+ /* Turn on the backlight. */
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+ rpi_touchscreen_i2c_write(ts, REG_PWM, 255);
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+
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+ /* Default to the same orientation as the closed source
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+ * firmware used for the panel. Runtime rotation
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+ * configuration will be supported using VC4's plane
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+ * orientation bits.
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+ */
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+ rpi_touchscreen_i2c_write(ts, REG_PORTA, BIT(2));
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+
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+ return 0;
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+}
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+
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+static int rpi_touchscreen_get_modes(struct drm_panel *panel)
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+{
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+ struct drm_connector *connector = panel->connector;
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+ struct drm_device *drm = panel->drm;
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+ unsigned int i, num = 0;
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+
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+ for (i = 0; i < ARRAY_SIZE(rpi_touchscreen_modes); i++) {
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+ const struct drm_display_mode *m = &rpi_touchscreen_modes[i];
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+ struct drm_display_mode *mode;
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+
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+ mode = drm_mode_duplicate(drm, m);
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+ if (!mode) {
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+ dev_err(drm->dev, "failed to add mode %ux%u@%u\n",
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+ m->hdisplay, m->vdisplay, m->vrefresh);
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+ continue;
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+ }
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+
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+ mode->type |= DRM_MODE_TYPE_DRIVER;
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+
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+ if (i == 0)
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+ mode->type |= DRM_MODE_TYPE_PREFERRED;
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+
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+ drm_mode_set_name(mode);
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+
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+ drm_mode_probed_add(connector, mode);
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+ num++;
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+ }
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+
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+ connector->display_info.bpc = 8;
|
|
+ connector->display_info.width_mm = 154;
|
|
+ connector->display_info.height_mm = 86;
|
|
+
|
|
+ return num;
|
|
+}
|
|
+
|
|
+static const struct drm_panel_funcs rpi_touchscreen_funcs = {
|
|
+ .disable = rpi_touchscreen_disable,
|
|
+ .unprepare = rpi_touchscreen_noop,
|
|
+ .prepare = rpi_touchscreen_noop,
|
|
+ .enable = rpi_touchscreen_enable,
|
|
+ .get_modes = rpi_touchscreen_get_modes,
|
|
+};
|
|
+
|
|
+static struct i2c_client *rpi_touchscreen_get_i2c(struct device *dev,
|
|
+ const char *name)
|
|
+{
|
|
+ struct device_node *node;
|
|
+ struct i2c_client *client;
|
|
+
|
|
+ node = of_parse_phandle(dev->of_node, name, 0);
|
|
+ if (!node)
|
|
+ return ERR_PTR(-ENODEV);
|
|
+
|
|
+ client = of_find_i2c_device_by_node(node);
|
|
+
|
|
+ of_node_put(node);
|
|
+
|
|
+ return client;
|
|
+}
|
|
+
|
|
+static int rpi_touchscreen_dsi_probe(struct mipi_dsi_device *dsi)
|
|
+{
|
|
+ struct device *dev = &dsi->dev;
|
|
+ struct rpi_touchscreen *ts;
|
|
+ int ret, ver;
|
|
+
|
|
+ ts = devm_kzalloc(dev, sizeof(*ts), GFP_KERNEL);
|
|
+ if (!ts)
|
|
+ return -ENOMEM;
|
|
+
|
|
+ dev_set_drvdata(dev, ts);
|
|
+
|
|
+ ts->dsi = dsi;
|
|
+ dsi->mode_flags = (MIPI_DSI_MODE_VIDEO |
|
|
+ MIPI_DSI_MODE_VIDEO_SYNC_PULSE |
|
|
+ MIPI_DSI_MODE_LPM);
|
|
+ dsi->format = MIPI_DSI_FMT_RGB888;
|
|
+ dsi->lanes = 1;
|
|
+
|
|
+ ts->bridge_i2c =
|
|
+ rpi_touchscreen_get_i2c(dev, "raspberrypi,touchscreen-bridge");
|
|
+ if (IS_ERR(ts->bridge_i2c)) {
|
|
+ ret = -EPROBE_DEFER;
|
|
+ return ret;
|
|
+ }
|
|
+
|
|
+ ver = rpi_touchscreen_i2c_read(ts, REG_ID);
|
|
+ if (ver < 0) {
|
|
+ dev_err(dev, "Atmel I2C read failed: %d\n", ver);
|
|
+ return -ENODEV;
|
|
+ }
|
|
+
|
|
+ switch (ver) {
|
|
+ case 0xde:
|
|
+ ts->atmel_ver = 1;
|
|
+ break;
|
|
+ case 0xc3:
|
|
+ ts->atmel_ver = 2;
|
|
+ break;
|
|
+ default:
|
|
+ dev_err(dev, "Unknown Atmel firmware revision: 0x%02x\n", ver);
|
|
+ return -ENODEV;
|
|
+ }
|
|
+
|
|
+ /* Turn off at boot, so we can cleanly sequence powering on. */
|
|
+ rpi_touchscreen_i2c_write(ts, REG_POWERON, 0);
|
|
+
|
|
+ drm_panel_init(&ts->base);
|
|
+ ts->base.dev = dev;
|
|
+ ts->base.funcs = &rpi_touchscreen_funcs;
|
|
+
|
|
+ ret = drm_panel_add(&ts->base);
|
|
+ if (ret < 0)
|
|
+ goto err_release_bridge;
|
|
+
|
|
+ return mipi_dsi_attach(dsi);
|
|
+
|
|
+err_release_bridge:
|
|
+ put_device(&ts->bridge_i2c->dev);
|
|
+ return ret;
|
|
+}
|
|
+
|
|
+static int rpi_touchscreen_dsi_remove(struct mipi_dsi_device *dsi)
|
|
+{
|
|
+ struct device *dev = &dsi->dev;
|
|
+ struct rpi_touchscreen *ts = dev_get_drvdata(dev);
|
|
+ int ret;
|
|
+
|
|
+ ret = mipi_dsi_detach(dsi);
|
|
+ if (ret < 0) {
|
|
+ dev_err(&dsi->dev, "failed to detach from DSI host: %d\n", ret);
|
|
+ return ret;
|
|
+ }
|
|
+
|
|
+ drm_panel_detach(&ts->base);
|
|
+ drm_panel_remove(&ts->base);
|
|
+
|
|
+ put_device(&ts->bridge_i2c->dev);
|
|
+
|
|
+ return 0;
|
|
+}
|
|
+
|
|
+static void rpi_touchscreen_dsi_shutdown(struct mipi_dsi_device *dsi)
|
|
+{
|
|
+ struct device *dev = &dsi->dev;
|
|
+ struct rpi_touchscreen *ts = dev_get_drvdata(dev);
|
|
+
|
|
+ rpi_touchscreen_i2c_write(ts, REG_POWERON, 0);
|
|
+}
|
|
+
|
|
+static const struct of_device_id rpi_touchscreen_of_match[] = {
|
|
+ { .compatible = "raspberrypi,touchscreen" },
|
|
+ { } /* sentinel */
|
|
+};
|
|
+MODULE_DEVICE_TABLE(of, rpi_touchscreen_of_match);
|
|
+
|
|
+static struct mipi_dsi_driver rpi_touchscreen_driver = {
|
|
+ .driver = {
|
|
+ .name = "raspberrypi-touchscreen",
|
|
+ .of_match_table = rpi_touchscreen_of_match,
|
|
+ },
|
|
+ .probe = rpi_touchscreen_dsi_probe,
|
|
+ .remove = rpi_touchscreen_dsi_remove,
|
|
+ .shutdown = rpi_touchscreen_dsi_shutdown,
|
|
+};
|
|
+module_mipi_dsi_driver(rpi_touchscreen_driver);
|
|
+
|
|
+MODULE_AUTHOR("Eric Anholt <eric@anholt.net>");
|
|
+MODULE_DESCRIPTION("Raspberry Pi 7-inch touchscreen driver");
|
|
+MODULE_LICENSE("GPL v2");
|