brcm2708: update linux 4.4 patches to latest version

As usual these patches were extracted and rebased from the raspberry pi repo:
https://github.com/raspberrypi/linux/tree/rpi-4.4.y

Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>

1 files changed, 169 insertions, 0 deletions

diff --git a/target/linux/brcm2708/patches-4.4/0533-brcmvirt_gpio-Create-coherent-buffer-and-push-to-fir.patch b/target/linux/brcm2708/patches-4.4/0533-brcmvirt_gpio-Create-coherent-buffer-and-push-to-fir.patch
new file mode 100644
index 0000000000..ede0abea34
--- /dev/null
+++ b/target/linux/brcm2708/patches-4.4/0533-brcmvirt_gpio-Create-coherent-buffer-and-push-to-fir.patch
@@ -0,0 +1,169 @@
+From 07afae52a73991a3ea948aab5d0303a5a9805b41 Mon Sep 17 00:00:00 2001
+From: popcornmix <popcornmix@gmail.com>
+Date: Wed, 9 Nov 2016 22:42:39 +0000
+Subject: [PATCH] brcmvirt_gpio: Create coherent buffer and push to firmware
+
+---
+ drivers/gpio/gpio-bcm-virt.c               | 88 +++++++++++++++++++++---------
+ include/soc/bcm2835/raspberrypi-firmware.h |  1 +
+ 2 files changed, 62 insertions(+), 27 deletions(-)
+
+--- a/drivers/gpio/gpio-bcm-virt.c
++++ b/drivers/gpio/gpio-bcm-virt.c
+@@ -15,6 +15,7 @@
+ #include <linux/module.h>
+ #include <linux/basic_mmio_gpio.h>
+ #include <linux/platform_device.h>
++#include <linux/dma-mapping.h>
+ #include <soc/bcm2835/raspberrypi-firmware.h>
+ 
+ #define MODULE_NAME "brcmvirt-gpio"
+@@ -26,6 +27,7 @@ struct brcmvirt_gpio {
+ 	/* two packed 16-bit counts of enabled and disables
+            Allows host to detect a brief enable that was missed */
+ 	u32			enables_disables[NUM_GPIO];
++	dma_addr_t		bus_addr;
+ };
+ 
+ static int brcmvirt_gpio_dir_in(struct gpio_chip *gc, unsigned off)
+@@ -76,13 +78,13 @@ static void brcmvirt_gpio_set(struct gpi
+ 
+ static int brcmvirt_gpio_probe(struct platform_device *pdev)
+ {
++	int err = 0;
+ 	struct device *dev = &pdev->dev;
+ 	struct device_node *np = dev->of_node;
+ 	struct device_node *fw_node;
+ 	struct rpi_firmware *fw;
+ 	struct brcmvirt_gpio *ucb;
+ 	u32 gpiovirtbuf;
+-	int err = 0;
+ 
+ 	fw_node = of_parse_phandle(np, "firmware", 0);
+ 	if (!fw_node) {
+@@ -94,35 +96,56 @@ static int brcmvirt_gpio_probe(struct pl
+ 	if (!fw)
+ 		return -EPROBE_DEFER;
+ 
+-	err = rpi_firmware_property(fw, RPI_FIRMWARE_FRAMEBUFFER_GET_GPIOVIRTBUF,
+-				    &gpiovirtbuf, sizeof(gpiovirtbuf));
+-
+-	if (err) {
+-		dev_err(dev, "Failed to get gpiovirtbuf\n");
+-		goto err;
+-	}
+-
+-	if (!gpiovirtbuf) {
+-		dev_err(dev, "No virtgpio buffer\n");
+-		err = -ENOENT;
+-		goto err;
+-	}
+-
+ 	ucb = devm_kzalloc(dev, sizeof *ucb, GFP_KERNEL);
+ 	if (!ucb) {
+ 		err = -EINVAL;
+-		goto err;
++		goto out;
+ 	}
+ 
+-	// mmap the physical memory
+-	gpiovirtbuf &= ~0xc0000000;
+-	ucb->ts_base = ioremap(gpiovirtbuf, 4096);
+-	if (ucb->ts_base == NULL) {
+-		dev_err(dev, "Failed to map physical address\n");
+-		err = -ENOENT;
+-		goto err;
++	ucb->ts_base = dma_zalloc_coherent(NULL, PAGE_SIZE, &ucb->bus_addr, GFP_KERNEL);
++	if (!ucb->ts_base) {
++		pr_err("[%s]: failed to dma_alloc_coherent(%ld)\n",
++				__func__, PAGE_SIZE);
++		err = -ENOMEM;
++		goto out;
+ 	}
+ 
++	gpiovirtbuf = (u32)ucb->bus_addr;
++	err = rpi_firmware_property(fw, RPI_FIRMWARE_FRAMEBUFFER_SET_GPIOVIRTBUF,
++				    &gpiovirtbuf, sizeof(gpiovirtbuf));
++
++	if (err || gpiovirtbuf != 0) {
++		dev_warn(dev, "Failed to set gpiovirtbuf, trying to get err:%x\n", err);
++		dma_free_coherent(NULL, PAGE_SIZE, ucb->ts_base, ucb->bus_addr);
++		ucb->ts_base = 0;
++		ucb->bus_addr = 0;
++	}
++
++	if (!ucb->ts_base) {
++		err = rpi_firmware_property(fw, RPI_FIRMWARE_FRAMEBUFFER_GET_GPIOVIRTBUF,
++					    &gpiovirtbuf, sizeof(gpiovirtbuf));
++
++		if (err) {
++			dev_err(dev, "Failed to get gpiovirtbuf\n");
++			goto out;
++		}
++
++		if (!gpiovirtbuf) {
++			dev_err(dev, "No virtgpio buffer\n");
++			err = -ENOENT;
++			goto out;
++		}
++
++		// mmap the physical memory
++		gpiovirtbuf &= ~0xc0000000;
++		ucb->ts_base = ioremap(gpiovirtbuf, 4096);
++		if (ucb->ts_base == NULL) {
++			dev_err(dev, "Failed to map physical address\n");
++			err = -ENOENT;
++			goto out;
++		}
++		ucb->bus_addr = 0;
++	}
+ 	ucb->gc.label = MODULE_NAME;
+ 	ucb->gc.owner = THIS_MODULE;
+ 	ucb->gc.dev = dev;
+@@ -138,13 +161,21 @@ static int brcmvirt_gpio_probe(struct pl
+ 
+ 	err = gpiochip_add(&ucb->gc);
+ 	if (err)
+-		goto err;
++		goto out;
+ 
+ 	platform_set_drvdata(pdev, ucb);
+ 
+-err:
++	return 0;
++out:
++	if (ucb->bus_addr) {
++		dma_free_coherent(NULL, PAGE_SIZE, ucb->ts_base, ucb->bus_addr);
++		ucb->bus_addr = 0;
++		ucb->ts_base = NULL;
++	} else if (ucb->ts_base) {
++		iounmap(ucb->ts_base);
++		ucb->ts_base = NULL;
++	}
+ 	return err;
+-
+ }
+ 
+ static int brcmvirt_gpio_remove(struct platform_device *pdev)
+@@ -153,7 +184,10 @@ static int brcmvirt_gpio_remove(struct p
+ 	struct brcmvirt_gpio *ucb = platform_get_drvdata(pdev);
+ 
+ 	gpiochip_remove(&ucb->gc);
+-	iounmap(ucb->ts_base);
++	if (ucb->bus_addr)
++		dma_free_coherent(NULL, PAGE_SIZE, ucb->ts_base, ucb->bus_addr);
++	else if (ucb->ts_base)
++		iounmap(ucb->ts_base);
+ 	return err;
+ }
+ 
+--- a/include/soc/bcm2835/raspberrypi-firmware.h
++++ b/include/soc/bcm2835/raspberrypi-firmware.h
+@@ -118,6 +118,7 @@ enum rpi_firmware_property_tag {
+ 	RPI_FIRMWARE_FRAMEBUFFER_SET_OVERSCAN =               0x0004800a,
+ 	RPI_FIRMWARE_FRAMEBUFFER_SET_PALETTE =                0x0004800b,
+ 	RPI_FIRMWARE_FRAMEBUFFER_SET_TOUCHBUF =               0x0004801f,
++	RPI_FIRMWARE_FRAMEBUFFER_SET_GPIOVIRTBUF =            0x00048020,
+ 	RPI_FIRMWARE_FRAMEBUFFER_SET_VSYNC =                  0x0004800e,
+ 	RPI_FIRMWARE_FRAMEBUFFER_SET_BACKLIGHT =              0x0004800f,
+