platform-v7a: Add barebox patchstack

This adds a barebox patchstack which is needed for the rasperrypi which
otherwise issues several warnings during boot. While at it add DWC2 USB
support as well to finally get networking support for the raspberrypi.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

1 files changed, 335 insertions, 0 deletions

diff --git a/configs/platform-v7a/patches/barebox-2019.12.0/0012-gpio-Add-raspberrypi-exp-gpio-driver.patch b/configs/platform-v7a/patches/barebox-2019.12.0/0012-gpio-Add-raspberrypi-exp-gpio-driver.patch
new file mode 100644
index 0000000..dcfc4c2
--- /dev/null
+++ b/configs/platform-v7a/patches/barebox-2019.12.0/0012-gpio-Add-raspberrypi-exp-gpio-driver.patch
@@ -0,0 +1,335 @@
+From: Sascha Hauer <s.hauer@pengutronix.de>
+Date: Tue, 7 Jan 2020 10:55:11 +0100
+Subject: [PATCH] gpio: Add raspberrypi exp gpio driver
+
+Taken from the kernel adopted to barebox.
+
+Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
+---
+ arch/arm/mach-bcm283x/include/mach/mbox.h |   4 +
+ drivers/gpio/Kconfig                      |   7 +
+ drivers/gpio/Makefile                     |   1 +
+ drivers/gpio/gpio-raspberrypi-exp.c       | 272 ++++++++++++++++++++++++++++++
+ 4 files changed, 284 insertions(+)
+ create mode 100644 drivers/gpio/gpio-raspberrypi-exp.c
+
+diff --git a/arch/arm/mach-bcm283x/include/mach/mbox.h b/arch/arm/mach-bcm283x/include/mach/mbox.h
+index 6db961b8076b..f10f5bc14844 100644
+--- a/arch/arm/mach-bcm283x/include/mach/mbox.h
++++ b/arch/arm/mach-bcm283x/include/mach/mbox.h
+@@ -126,6 +126,10 @@ struct bcm2835_mbox_tag_hdr {
+  */
+ 
+ #define BCM2835_MBOX_TAG_GET_BOARD_REV	0x00010002
++#define BCM2835_MBOX_TAG_GET_GPIO_STATE 0x00030041
++#define BCM2835_MBOX_TAG_SET_GPIO_STATE 0x00038041
++#define BCM2835_MBOX_TAG_GET_GPIO_CONFIG 0x00030043
++#define BCM2835_MBOX_TAG_SET_GPIO_CONFIG 0x00038043
+ 
+ /*
+  * ids
+diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig
+index 0f924d135f0e..7e4fc90d3934 100644
+--- a/drivers/gpio/Kconfig
++++ b/drivers/gpio/Kconfig
+@@ -129,6 +129,13 @@ config GPIO_PL061
+ 	help
+ 	  Say yes here to support the PrimeCell PL061 GPIO device
+ 
++config GPIO_RASPBERRYPI_EXP
++	bool "Raspberry Pi 3 GPIO Expander"
++	depends on ARCH_BCM283X
++	help
++	  Turn on GPIO support for the expander on Raspberry Pi 3 boards, using
++	  the firmware mailbox to communicate with VideoCore on BCM283x chips.
++
+ config GPIO_STMPE
+ 	depends on MFD_STMPE
+ 	bool "STMPE GPIO Expander"
+diff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile
+index bc5c500e4d27..77dcf58f640d 100644
+--- a/drivers/gpio/Makefile
++++ b/drivers/gpio/Makefile
+@@ -22,3 +22,4 @@ obj-$(CONFIG_GPIO_TEGRA)	+= gpio-tegra.o
+ obj-$(CONFIG_GPIO_DESIGNWARE)	+= gpio-dw.o
+ obj-$(CONFIG_GPIO_SX150X)	+= gpio-sx150x.o
+ obj-$(CONFIG_GPIO_VF610)	+= gpio-vf610.o
++obj-$(CONFIG_GPIO_RASPBERRYPI_EXP) += gpio-raspberrypi-exp.o
+diff --git a/drivers/gpio/gpio-raspberrypi-exp.c b/drivers/gpio/gpio-raspberrypi-exp.c
+new file mode 100644
+index 000000000000..0713e3ca5fb6
+--- /dev/null
++++ b/drivers/gpio/gpio-raspberrypi-exp.c
+@@ -0,0 +1,272 @@
++// SPDX-License-Identifier: GPL-2.0+
++/*
++ *  Raspberry Pi 3 expander GPIO driver
++ *
++ *  Uses the firmware mailbox service to communicate with the
++ *  GPIO expander on the VPU.
++ *
++ *  Copyright (C) 2017 Raspberry Pi Trading Ltd.
++ */
++
++#include <common.h>
++#include <gpio.h>
++#include <init.h>
++#include <mach/mbox.h>
++
++#define NUM_GPIO 8
++
++#define RPI_EXP_GPIO_BASE	128
++
++#define RPI_EXP_GPIO_DIR_IN	0
++#define RPI_EXP_GPIO_DIR_OUT	1
++
++struct rpi_exp_gpio {
++	struct gpio_chip gc;
++	struct rpi_firmware *fw;
++};
++
++/* VC4 firmware mailbox interface data structures */
++struct gpio_set_config {
++	struct bcm2835_mbox_hdr hdr;		/* buf_size, code */
++	struct bcm2835_mbox_tag_hdr tag_hdr;	/* tag, val_buf_size, val_len */
++        union {
++                struct {
++			u32 gpio;
++			u32 direction;
++			u32 polarity;
++			u32 term_en;
++			u32 term_pull_up;
++			u32 state;
++                } req;
++	} body;
++	u32 end_tag;
++};
++
++struct gpio_get_config {
++	struct bcm2835_mbox_hdr hdr;
++	struct bcm2835_mbox_tag_hdr tag_hdr;
++        union {
++                struct {
++			u32 gpio;
++			u32 direction;
++			u32 polarity;
++			u32 term_en;
++			u32 term_pull_up;
++                } req;
++	} body;
++	u32 end_tag;
++};
++
++struct gpio_get_set_state {
++	struct bcm2835_mbox_hdr hdr;
++	struct bcm2835_mbox_tag_hdr tag_hdr;
++        union {
++                struct {
++			u32 gpio;
++			u32 state;
++                } req;
++	} body;
++	u32 end_tag;
++};
++
++static inline struct rpi_exp_gpio *to_rpi_gpio(struct gpio_chip *gc)
++{
++	return container_of(gc, struct rpi_exp_gpio, gc);
++}
++
++static int rpi_exp_gpio_get_polarity(struct gpio_chip *gc, unsigned int off)
++{
++	struct rpi_exp_gpio *gpio;
++	int ret;
++	BCM2835_MBOX_STACK_ALIGN(struct gpio_get_config, get);
++	BCM2835_MBOX_INIT_HDR(get);
++	BCM2835_MBOX_INIT_TAG(get, GET_GPIO_CONFIG);
++
++	gpio = to_rpi_gpio(gc);
++
++	get->body.req.gpio = off + RPI_EXP_GPIO_BASE;	/* GPIO to update */
++
++	ret = bcm2835_mbox_call_prop(BCM2835_MBOX_PROP_CHAN, &get->hdr);
++	if (ret || get->body.req.gpio != 0) {
++		dev_err(gc->dev, "Failed to get GPIO %u config (%d %x)\n",
++			off, ret, get->body.req.gpio);
++		return ret ? ret : -EIO;
++	}
++	return get->body.req.polarity;
++}
++
++static int rpi_exp_gpio_dir_in(struct gpio_chip *gc, unsigned int off)
++{
++	struct rpi_exp_gpio *gpio;
++	int ret;
++	BCM2835_MBOX_STACK_ALIGN(struct gpio_set_config, set_in);
++	BCM2835_MBOX_INIT_HDR(set_in);
++	BCM2835_MBOX_INIT_TAG(set_in, SET_GPIO_CONFIG);
++
++	gpio = to_rpi_gpio(gc);
++
++	set_in->body.req.gpio = off + RPI_EXP_GPIO_BASE;	/* GPIO to update */
++	set_in->body.req.direction = RPI_EXP_GPIO_DIR_IN;
++	set_in->body.req.term_en = 0;		/* termination disabled */
++	set_in->body.req.term_pull_up = 0;	/* n/a as termination disabled */
++	set_in->body.req.state = 0;		/* n/a as configured as an input */
++
++	ret = rpi_exp_gpio_get_polarity(gc, off);
++	if (ret < 0)
++		return ret;
++
++	set_in->body.req.polarity = ret;		/* Retain existing setting */
++
++	ret = bcm2835_mbox_call_prop(BCM2835_MBOX_PROP_CHAN, &set_in->hdr);
++	if (ret || set_in->body.req.gpio != 0) {
++		dev_err(gc->dev, "Failed to set GPIO %u to input (%d %x)\n",
++			off, ret, set_in->body.req.gpio);
++		return ret ? ret : -EIO;
++	}
++
++	return 0;
++}
++
++static int rpi_exp_gpio_dir_out(struct gpio_chip *gc, unsigned int off, int val)
++{
++	struct rpi_exp_gpio *gpio;
++	int ret;
++	BCM2835_MBOX_STACK_ALIGN(struct gpio_set_config, set_out);
++	BCM2835_MBOX_INIT_HDR(set_out);
++	BCM2835_MBOX_INIT_TAG(set_out, SET_GPIO_CONFIG);
++
++	gpio = to_rpi_gpio(gc);
++
++	set_out->body.req.gpio = off + RPI_EXP_GPIO_BASE;	/* GPIO to update */
++	set_out->body.req.direction = RPI_EXP_GPIO_DIR_OUT;
++	set_out->body.req.term_en = 0;		/* n/a as an output */
++	set_out->body.req.term_pull_up = 0;	/* n/a as termination disabled */
++	set_out->body.req.state = val;		/* Output state */
++
++	ret = rpi_exp_gpio_get_polarity(gc, off);
++	if (ret < 0)
++		return ret;
++	set_out->body.req.polarity = ret;		/* Retain existing setting */
++
++	ret = bcm2835_mbox_call_prop(BCM2835_MBOX_PROP_CHAN, &set_out->hdr);
++	if (ret || set_out->body.req.gpio != 0) {
++		dev_err(gc->dev, "Failed to set GPIO %u to output (%d %x)\n",
++			off, ret, set_out->body.req.gpio);
++		return ret ? ret : -EIO;
++	}
++	return 0;
++}
++
++static int rpi_exp_gpio_get_direction(struct gpio_chip *gc, unsigned int off)
++{
++	struct rpi_exp_gpio *gpio;
++	int ret;
++	BCM2835_MBOX_STACK_ALIGN(struct gpio_get_config, get);
++	BCM2835_MBOX_INIT_HDR(get);
++	BCM2835_MBOX_INIT_TAG(get, GET_GPIO_CONFIG);
++
++	gpio = to_rpi_gpio(gc);
++
++	get->body.req.gpio = off + RPI_EXP_GPIO_BASE;	/* GPIO to update */
++
++	ret = bcm2835_mbox_call_prop(BCM2835_MBOX_PROP_CHAN, &get->hdr);
++	if (ret || get->body.req.gpio != 0) {
++		dev_err(gc->dev,
++			"Failed to get GPIO %u config (%d %x)\n", off, ret,
++			get->body.req.gpio);
++		return ret ? ret : -EIO;
++	}
++	if (get->body.req.direction)
++		return GPIOF_DIR_OUT;
++
++	return GPIOF_DIR_IN;
++}
++
++static int rpi_exp_gpio_get(struct gpio_chip *gc, unsigned int off)
++{
++	struct rpi_exp_gpio *gpio;
++	int ret;
++	BCM2835_MBOX_STACK_ALIGN(struct gpio_get_set_state, get);
++	BCM2835_MBOX_INIT_HDR(get);
++	BCM2835_MBOX_INIT_TAG(get, GET_GPIO_STATE);
++
++	gpio = to_rpi_gpio(gc);
++
++	get->body.req.gpio = off + RPI_EXP_GPIO_BASE;	/* GPIO to update */
++	get->body.req.state = 0;		/* storage for returned value */
++
++	ret = bcm2835_mbox_call_prop(BCM2835_MBOX_PROP_CHAN, &get->hdr);
++	if (ret || get->body.req.gpio != 0) {
++		dev_err(gc->dev,
++			"Failed to get GPIO %u state (%d %x)\n", off, ret,
++			get->body.req.gpio);
++		return ret ? ret : -EIO;
++	}
++	return !!get->body.req.state;
++}
++
++static void rpi_exp_gpio_set(struct gpio_chip *gc, unsigned int off, int val)
++{
++	struct rpi_exp_gpio *gpio;
++	int ret;
++	BCM2835_MBOX_STACK_ALIGN(struct gpio_get_set_state, set);
++	BCM2835_MBOX_INIT_HDR(set);
++	BCM2835_MBOX_INIT_TAG(set, SET_GPIO_STATE);
++
++	gpio = to_rpi_gpio(gc);
++
++	set->body.req.gpio = off + RPI_EXP_GPIO_BASE;	/* GPIO to update */
++	set->body.req.state = val;	/* Output state */
++
++	ret = bcm2835_mbox_call_prop(BCM2835_MBOX_PROP_CHAN, &set->hdr);
++	if (ret || set->body.req.gpio != 0)
++		dev_err(gc->dev,
++			"Failed to set GPIO %u state (%d %x)\n", off, ret,
++			set->body.req.gpio);
++}
++
++static struct gpio_ops rpi_exp_gpio_ops = {
++	.direction_input = rpi_exp_gpio_dir_in,
++	.direction_output = rpi_exp_gpio_dir_out,
++	.get_direction = rpi_exp_gpio_get_direction,
++	.get = rpi_exp_gpio_get,
++	.set = rpi_exp_gpio_set,
++};
++
++static int rpi_exp_gpio_probe(struct device_d *dev)
++{
++	struct rpi_exp_gpio *rpi_gpio;
++	int ret;
++
++	rpi_gpio = xzalloc(sizeof(*rpi_gpio));
++
++	rpi_gpio->gc.dev = dev;
++	rpi_gpio->gc.base = -1;
++	rpi_gpio->gc.ngpio = NUM_GPIO;
++	rpi_gpio->gc.ops = &rpi_exp_gpio_ops;
++
++	ret = gpiochip_add(&rpi_gpio->gc);
++	if (ret)
++		return ret;
++
++	dev_dbg(dev, "probed gpiochip with %d gpios, base %d\n",
++			rpi_gpio->gc.ngpio, rpi_gpio->gc.base);
++
++	return 0;
++}
++
++static __maybe_unused struct of_device_id rpi_exp_gpio_ids[] = {
++	{
++		.compatible = "raspberrypi,firmware-gpio",
++	}, {
++		/* sentinel */
++	},
++};
++
++static struct driver_d rpi_exp_gpio_driver = {
++	.name = "rpi-exp-gpio",
++	.probe = rpi_exp_gpio_probe,
++	.of_compatible = DRV_OF_COMPAT(rpi_exp_gpio_ids),
++};
++
++device_platform_driver(rpi_exp_gpio_driver);