bcm27xx: add linux 5.4 support

Tested on bcm2710 (Raspberry Pi 3B).

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

1 files changed, 88 insertions, 0 deletions

diff --git a/target/linux/bcm27xx/patches-5.4/950-0421-pcie-brcmstb-Bounce-buffer-support-is-for-BCM2711B0.patch b/target/linux/bcm27xx/patches-5.4/950-0421-pcie-brcmstb-Bounce-buffer-support-is-for-BCM2711B0.patch
new file mode 100644
index 0000000000..73da382074
--- /dev/null
+++ b/target/linux/bcm27xx/patches-5.4/950-0421-pcie-brcmstb-Bounce-buffer-support-is-for-BCM2711B0.patch
@@ -0,0 +1,88 @@
+From 58ac2d4474e531300f9f83773aa4d09e95ee2626 Mon Sep 17 00:00:00 2001
+From: Phil Elwell <phil@raspberrypi.org>
+Date: Fri, 12 Jul 2019 11:41:25 +0100
+Subject: [PATCH] pcie-brcmstb: Bounce buffer support is for BCM2711B0
+
+Add a new compatible string to identify BCM2711B0, as later revisions
+don't require the bounce buffer support.
+
+Signed-off-by: Phil Elwell <phil@raspberrypi.org>
+---
+ drivers/pci/controller/pcie-brcmstb.c | 31 +++++++++++++++++++++++----
+ 1 file changed, 27 insertions(+), 4 deletions(-)
+
+--- a/drivers/pci/controller/pcie-brcmstb.c
++++ b/drivers/pci/controller/pcie-brcmstb.c
+@@ -206,6 +206,8 @@ enum pcie_type {
+ 	BCM7435,
+ 	GENERIC,
+ 	BCM7278,
++	BCM2711B0,
++	BCM2711,
+ };
+ 
+ struct brcm_window {
+@@ -302,6 +304,20 @@ static const int pcie_offsets[] = {
+ 	[EXT_CFG_DATA]   = 0x8000,
+ };
+ 
++static const struct pcie_cfg_data bcm2711b0_cfg = {
++	.reg_field_info	= pcie_reg_field_info,
++	.offsets	= pcie_offsets,
++	.max_burst_size	= BURST_SIZE_128,
++	.type		= BCM2711B0,
++};
++
++static const struct pcie_cfg_data bcm2711_cfg = {
++	.reg_field_info	= pcie_reg_field_info,
++	.offsets	= pcie_offsets,
++	.max_burst_size	= BURST_SIZE_128,
++	.type		= BCM2711,
++};
++
+ static const struct pcie_cfg_data bcm7435_cfg = {
+ 	.reg_field_info	= pcie_reg_field_info,
+ 	.offsets	= pcie_offsets,
+@@ -312,7 +328,7 @@ static const struct pcie_cfg_data bcm743
+ static const struct pcie_cfg_data generic_cfg = {
+ 	.reg_field_info	= pcie_reg_field_info,
+ 	.offsets	= pcie_offsets,
+-	.max_burst_size	= BURST_SIZE_128, // before BURST_SIZE_512
++	.max_burst_size	= BURST_SIZE_512,
+ 	.type		= GENERIC,
+ };
+ 
+@@ -380,7 +396,7 @@ static unsigned int bounce_buffer = 32*1
+ module_param(bounce_buffer, uint, 0644);
+ MODULE_PARM_DESC(bounce_buffer, "Size of bounce buffer");
+ 
+-static unsigned int bounce_threshold = 0xc0000000;
++static unsigned int bounce_threshold;
+ module_param(bounce_threshold, uint, 0644);
+ MODULE_PARM_DESC(bounce_threshold, "Bounce threshold");
+ 
+@@ -1675,6 +1691,8 @@ static int brcm_pcie_remove(struct platf
+ }
+ 
+ static const struct of_device_id brcm_pcie_match[] = {
++	{ .compatible = "brcm,bcm2711b0-pcie", .data = &bcm2711b0_cfg },
++	{ .compatible = "brcm,bcm2711-pcie", .data = &bcm2711_cfg },
+ 	{ .compatible = "brcm,bcm7425-pcie", .data = &bcm7425_cfg },
+ 	{ .compatible = "brcm,bcm7435-pcie", .data = &bcm7435_cfg },
+ 	{ .compatible = "brcm,bcm7278-pcie", .data = &bcm7278_cfg },
+@@ -1731,8 +1749,13 @@ static int brcm_pcie_probe(struct platfo
+ 	if (IS_ERR(base))
+ 		return PTR_ERR(base);
+ 
+-	/* To Do: Add hardware check if this ever gets fixed */
+-	if (max_pfn > (bounce_threshold/PAGE_SIZE)) {
++	if (!bounce_threshold) {
++		/* PCIe on BCM2711B0 can only address 3GB */
++		if (pcie->type == BCM2711B0 || pcie->type == GENERIC)
++			bounce_threshold = 0xc0000000;
++	}
++
++	if (bounce_threshold && (max_pfn > (bounce_threshold/PAGE_SIZE))) {
+ 		int ret;
+ 		ret = brcm_pcie_bounce_init(dev, bounce_buffer,
+ 					    (dma_addr_t)bounce_threshold);