brcm2708: rename target to bcm27xx

This change makes the names of Broadcom targets consistent by using
the common notation based on SoC/CPU ID (which is used internally
anyway), bcmXXXX instead of brcmXXXX.
This is even used for target TITLE in make menuconfig already,
only the short target name used brcm so far.

Despite, since subtargets range from bcm2708 to bcm2711, it seems
appropriate to use bcm27xx instead of bcm2708 (again, as already done
for BOARDNAME).

This also renames the packages brcm2708-userland and brcm2708-gpu-fw.

Signed-off-by: Adrian Schmutzler <freifunk@adrianschmutzler.de>
Acked-by: Álvaro Fernández Rojas <noltari@gmail.com>

1 files changed, 158 insertions, 0 deletions

diff --git a/target/linux/bcm27xx/patches-4.19/950-0465-hwrng-iproc-rng200-Add-BCM2838-support.patch b/target/linux/bcm27xx/patches-4.19/950-0465-hwrng-iproc-rng200-Add-BCM2838-support.patch
new file mode 100644
index 0000000000..c2a29a01ca
--- /dev/null
+++ b/target/linux/bcm27xx/patches-4.19/950-0465-hwrng-iproc-rng200-Add-BCM2838-support.patch
@@ -0,0 +1,158 @@
+From e9c0fd87b6169baf5bd10293a85675d505086191 Mon Sep 17 00:00:00 2001
+From: Stefan Wahren <wahrenst@gmx.net>
+Date: Sat, 4 May 2019 17:06:15 +0200
+Subject: [PATCH] hwrng: iproc-rng200: Add BCM2838 support
+
+The HWRNG on the BCM2838 is compatible to iproc-rng200, so add the
+support to this driver instead of bcm2835-rng.
+
+Signed-off-by: Stefan Wahren <wahrenst@gmx.net>
+---
+ drivers/char/hw_random/Kconfig        |  4 +-
+ drivers/char/hw_random/iproc-rng200.c | 81 +++++++++++++++++++++++++--
+ 2 files changed, 79 insertions(+), 6 deletions(-)
+
+--- a/drivers/char/hw_random/Kconfig
++++ b/drivers/char/hw_random/Kconfig
+@@ -89,11 +89,11 @@ config HW_RANDOM_BCM2835
+ 
+ config HW_RANDOM_IPROC_RNG200
+ 	tristate "Broadcom iProc/STB RNG200 support"
+-	depends on ARCH_BCM_IPROC || ARCH_BRCMSTB
++	depends on ARCH_BCM_IPROC || ARCH_BCM2835 || ARCH_BRCMSTB
+ 	default HW_RANDOM
+ 	---help---
+ 	  This driver provides kernel-side support for the RNG200
+-	  hardware found on the Broadcom iProc and STB SoCs.
++	  hardware found on the Broadcom iProc, BCM2838 and STB SoCs.
+ 
+ 	  To compile this driver as a module, choose M here: the
+ 	  module will be called iproc-rng200
+--- a/drivers/char/hw_random/iproc-rng200.c
++++ b/drivers/char/hw_random/iproc-rng200.c
+@@ -29,6 +29,7 @@
+ #define RNG_CTRL_RNG_RBGEN_MASK				0x00001FFF
+ #define RNG_CTRL_RNG_RBGEN_ENABLE			0x00000001
+ #define RNG_CTRL_RNG_RBGEN_DISABLE			0x00000000
++#define RNG_CTRL_RNG_DIV_CTRL_SHIFT			13
+ 
+ #define RNG_SOFT_RESET_OFFSET				0x04
+ #define RNG_SOFT_RESET					0x00000001
+@@ -36,16 +37,23 @@
+ #define RBG_SOFT_RESET_OFFSET				0x08
+ #define RBG_SOFT_RESET					0x00000001
+ 
++#define RNG_TOTAL_BIT_COUNT_OFFSET			0x0C
++
++#define RNG_TOTAL_BIT_COUNT_THRESHOLD_OFFSET		0x10
++
+ #define RNG_INT_STATUS_OFFSET				0x18
+ #define RNG_INT_STATUS_MASTER_FAIL_LOCKOUT_IRQ_MASK	0x80000000
+ #define RNG_INT_STATUS_STARTUP_TRANSITIONS_MET_IRQ_MASK	0x00020000
+ #define RNG_INT_STATUS_NIST_FAIL_IRQ_MASK		0x00000020
+ #define RNG_INT_STATUS_TOTAL_BITS_COUNT_IRQ_MASK	0x00000001
+ 
++#define RNG_INT_ENABLE_OFFSET				0x1C
++
+ #define RNG_FIFO_DATA_OFFSET				0x20
+ 
+ #define RNG_FIFO_COUNT_OFFSET				0x24
+ #define RNG_FIFO_COUNT_RNG_FIFO_COUNT_MASK		0x000000FF
++#define RNG_FIFO_COUNT_RNG_FIFO_THRESHOLD_SHIFT		8
+ 
+ struct iproc_rng200_dev {
+ 	struct hwrng rng;
+@@ -166,6 +174,64 @@ static int iproc_rng200_init(struct hwrn
+ 	return 0;
+ }
+ 
++static int bcm2838_rng200_read(struct hwrng *rng, void *buf, size_t max,
++			       bool wait)
++{
++	struct iproc_rng200_dev *priv = to_rng_priv(rng);
++	u32 max_words = max / sizeof(u32);
++	u32 num_words, count, val;
++
++	/* ensure warm up period has elapsed */
++	while (1) {
++		val = ioread32(priv->base + RNG_TOTAL_BIT_COUNT_OFFSET);
++		if (val > 16)
++			break;
++		cpu_relax();
++	}
++
++	/* ensure fifo is not empty */
++	while (1) {
++		num_words = ioread32(priv->base + RNG_FIFO_COUNT_OFFSET) &
++			    RNG_FIFO_COUNT_RNG_FIFO_COUNT_MASK;
++		if (num_words)
++			break;
++		if (!wait)
++			return 0;
++		cpu_relax();
++	}
++
++	if (num_words > max_words)
++		num_words = max_words;
++
++	for (count = 0; count < num_words; count++) {
++		((u32 *)buf)[count] = ioread32(priv->base +
++					       RNG_FIFO_DATA_OFFSET);
++	}
++
++	return num_words * sizeof(u32);
++}
++
++static int bcm2838_rng200_init(struct hwrng *rng)
++{
++	struct iproc_rng200_dev *priv = to_rng_priv(rng);
++	uint32_t val;
++
++	if (ioread32(priv->base + RNG_CTRL_OFFSET) & RNG_CTRL_RNG_RBGEN_MASK)
++		return 0;
++
++	/* initial numbers generated are "less random" so will be discarded */
++	val = 0x40000;
++	iowrite32(val, priv->base + RNG_TOTAL_BIT_COUNT_THRESHOLD_OFFSET);
++	/* min fifo count to generate full interrupt */
++	val = 2 << RNG_FIFO_COUNT_RNG_FIFO_THRESHOLD_SHIFT;
++	iowrite32(val, priv->base + RNG_FIFO_COUNT_OFFSET);
++	/* enable the rng - 1Mhz sample rate */
++	val = (0x3 << RNG_CTRL_RNG_DIV_CTRL_SHIFT) | RNG_CTRL_RNG_RBGEN_MASK;
++	iowrite32(val, priv->base + RNG_CTRL_OFFSET);
++
++	return 0;
++}
++
+ static void iproc_rng200_cleanup(struct hwrng *rng)
+ {
+ 	struct iproc_rng200_dev *priv = to_rng_priv(rng);
+@@ -202,10 +268,16 @@ static int iproc_rng200_probe(struct pla
+ 		return PTR_ERR(priv->base);
+ 	}
+ 
+-	priv->rng.name = "iproc-rng200",
+-	priv->rng.read = iproc_rng200_read,
+-	priv->rng.init = iproc_rng200_init,
+-	priv->rng.cleanup = iproc_rng200_cleanup,
++	priv->rng.name = pdev->name;
++	priv->rng.cleanup = iproc_rng200_cleanup;
++
++	if (of_device_is_compatible(dev->of_node, "brcm,bcm2838-rng200")) {
++		priv->rng.init = bcm2838_rng200_init;
++		priv->rng.read = bcm2838_rng200_read;
++	} else {
++		priv->rng.init = iproc_rng200_init;
++		priv->rng.read = iproc_rng200_read;
++	}
+ 
+ 	/* Register driver */
+ 	ret = devm_hwrng_register(dev, &priv->rng);
+@@ -222,6 +294,7 @@ static int iproc_rng200_probe(struct pla
+ static const struct of_device_id iproc_rng200_of_match[] = {
+ 	{ .compatible = "brcm,bcm7278-rng200", },
+ 	{ .compatible = "brcm,iproc-rng200", },
++	{ .compatible = "brcm,bcm2838-rng200"},
+ 	{},
+ };
+ MODULE_DEVICE_TABLE(of, iproc_rng200_of_match);