bmips: add ATH9K PCI fixups

Add support for registering ATH9K PCI fixups needed to bring up wifi on some
devices.

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

3 files changed, 256 insertions, 1 deletions

diff --git a/target/linux/bmips/dts/bcm6358-huawei-hg556a-b.dts b/target/linux/bmips/dts/bcm6358-huawei-hg556a-b.dts
index 0f21ca4a6b..65b4480ee1 100644
--- a/target/linux/bmips/dts/bcm6358-huawei-hg556a-b.dts
+++ b/target/linux/bmips/dts/bcm6358-huawei-hg556a-b.dts
@@ -119,6 +119,21 @@
 			gpios = <&pinctrl 28 GPIO_ACTIVE_LOW>;
 		};
 	};
+
+	ath9k-fixup {
+		compatible = "brcm,ath9k-fixup";
+		reg = <0x30000000 0x8000000>;
+
+		pci-dev = <1>;
+
+		mtd-mac-address = <&cfe 0x6a0>;
+		mtd-mac-address-increment = <1>;
+
+		ath,eeprom = <&cal_data 0x1e000>;
+		ath,endian-check;
+		ath,led-pin = <2>;
+		ath,led-active-high;
+	};
 };
 
 &ehci {
diff --git a/target/linux/bmips/files/arch/mips/bmips/ath9k-fixup.c b/target/linux/bmips/files/arch/mips/bmips/ath9k-fixup.c
new file mode 100644
index 0000000000..dd13ac6256
--- /dev/null
+++ b/target/linux/bmips/files/arch/mips/bmips/ath9k-fixup.c
@@ -0,0 +1,240 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * ATH9K Fixup Driver
+ *
+ * Copyright (C) 2020 Álvaro Fernández Rojas <noltari@gmail.com>
+ * Copyright (C) 2014 Jonas Gorski <jonas.gorski@gmail.com>
+ * Copyright (C) 2008 Maxime Bizon <mbizon@freebox.fr>
+ * Copyright (C) 2008 Florian Fainelli <f.fainelli@gmail.com>
+ */
+
+#include <linux/delay.h>
+#include <linux/etherdevice.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/mtd/mtd.h>
+#include <linux/of_net.h>
+#include <linux/of_platform.h>
+#include <linux/pci.h>
+#include <linux/types.h>
+#include <linux/ath9k_platform.h>
+
+#define ATH9K_MAX_FIXUPS	2
+
+#define ATH9K_DEF_LED_PIN	-1
+#define ATH9K_DEF_PCI_DEV	255
+
+struct ath9k_fixup {
+	struct device *dev;
+	struct resource *mem_res;
+	u32 pci_dev;
+	u8 mac[ETH_ALEN];
+	struct ath9k_platform_data pdata;
+};
+
+static int ath9k_num_fixups;
+static struct ath9k_fixup *ath9k_fixups[ATH9K_MAX_FIXUPS];
+
+static void ath9k_pci_fixup(struct pci_dev *dev)
+{
+	void __iomem *mem;
+	struct ath9k_fixup *priv = NULL;
+	struct ath9k_platform_data *pdata = NULL;
+	struct pci_dev *bridge = pci_upstream_bridge(dev);
+	u16 *cal_data = NULL;
+	u16 cmd;
+	u32 bar0;
+	u32 val;
+	unsigned i;
+
+	for (i = 0; i < ath9k_num_fixups; i++) {
+		if (ath9k_fixups[i]->pci_dev != PCI_SLOT(dev->devfn))
+			continue;
+
+		priv = ath9k_fixups[i];
+		cal_data = priv->pdata.eeprom_data;
+		pdata = &priv->pdata;
+		break;
+	}
+
+	if (cal_data == NULL)
+		return;
+
+	if (*cal_data != 0xa55a) {
+		pr_err("pci %s: invalid calibration data\n", pci_name(dev));
+		return;
+	}
+
+	pr_info("pci %s: fixup device configuration\n", pci_name(dev));
+
+	val = priv->mem_res->start;
+	mem = ioremap(priv->mem_res->start, resource_size(priv->mem_res));
+	if (!mem) {
+		pr_err("pci %s: ioremap error\n", pci_name(dev));
+		return;
+	}
+
+	if (bridge)
+		pci_enable_device(bridge);
+
+	pci_read_config_dword(dev, PCI_BASE_ADDRESS_0, &bar0);
+	pci_read_config_dword(dev, PCI_BASE_ADDRESS_0, &bar0);
+	pci_write_config_dword(dev, PCI_BASE_ADDRESS_0, val);
+
+	pci_read_config_word(dev, PCI_COMMAND, &cmd);
+	cmd |= PCI_COMMAND_MASTER | PCI_COMMAND_MEMORY;
+	pci_write_config_word(dev, PCI_COMMAND, cmd);
+
+	/* set offset to first reg address */
+	cal_data += 3;
+	while(*cal_data != 0xffff) {
+		u32 reg;
+
+		reg = *cal_data++;
+		val = *cal_data++;
+		val |= (*cal_data++) << 16;
+
+		writel(val, mem + reg);
+		udelay(100);
+	}
+
+	pci_read_config_dword(dev, PCI_VENDOR_ID, &val);
+	dev->vendor = val & 0xffff;
+	dev->device = (val >> 16) & 0xffff;
+
+	pci_read_config_dword(dev, PCI_CLASS_REVISION, &val);
+	dev->revision = val & 0xff;
+	dev->class = val >> 8; /* upper 3 bytes */
+
+	pci_read_config_word(dev, PCI_COMMAND, &cmd);
+	cmd &= ~(PCI_COMMAND_MASTER | PCI_COMMAND_MEMORY);
+	pci_write_config_word(dev, PCI_COMMAND, cmd);
+
+	pci_write_config_dword(dev, PCI_BASE_ADDRESS_0, bar0);
+
+	if (bridge)
+		pci_disable_device(bridge);
+
+	iounmap(mem);
+
+	dev->dev.platform_data = pdata;
+}
+DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_ATHEROS, PCI_ANY_ID, ath9k_pci_fixup);
+
+static int ath9k_mtd_eeprom(struct ath9k_fixup *priv)
+{
+	struct device *dev = priv->dev;
+	struct device_node *node = dev->of_node;
+	struct device_node *mtd_np = NULL;
+	struct mtd_info *the_mtd;
+	phandle phandle;
+	size_t eeprom_readlen;
+	const char *part;
+	const __be32 *list;
+	int ret, i;
+
+	list = of_get_property(node, "ath,eeprom", &i);
+	if (!list || (i != (2 * sizeof(*list))))
+		return -ENODEV;
+
+	phandle = be32_to_cpup(list++);
+	if (phandle)
+		mtd_np = of_find_node_by_phandle(phandle);
+	if (!mtd_np)
+		return -ENODEV;
+
+	part = of_get_property(mtd_np, "label", NULL);
+	if (!part)
+		part = mtd_np->name;
+
+	the_mtd = get_mtd_device_nm(part);
+	if (IS_ERR(the_mtd))
+		return -ENODEV;
+
+	ret = mtd_read(the_mtd, be32_to_cpup(list),
+		       ATH9K_PLAT_EEP_MAX_WORDS * sizeof(u16),
+		       &eeprom_readlen, (void *) priv->pdata.eeprom_data);
+	put_mtd_device(the_mtd);
+	if (ret)
+		return ret;
+
+	return 0;
+}
+
+static int ath9k_fixup_probe(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	struct device_node *node = dev->of_node;
+	struct ath9k_fixup *priv;
+	struct resource *res;
+	const void *mac;
+	int ret;
+
+	if (ath9k_num_fixups >= ATH9K_MAX_FIXUPS)
+		return -ENOMEM;
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	if (!res)
+		return -EINVAL;
+
+	priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
+	if (!priv)
+		return -ENOMEM;
+
+	priv->dev = dev;
+	priv->mem_res = res;
+
+	ret = of_property_read_u32(node, "pci-dev", &priv->pci_dev);
+	if (ret)
+		priv->pci_dev = ATH9K_DEF_PCI_DEV;
+
+	ret = ath9k_mtd_eeprom(priv);
+	if (ret)
+		return ret;
+
+	priv->pdata.endian_check = of_property_read_bool(node,
+		"ath,endian-check");
+	ret = of_property_read_s32(node, "ath,led-pin", &priv->pdata.led_pin);
+	if (ret)
+		priv->pdata.led_pin = ATH9K_DEF_LED_PIN;
+	priv->pdata.led_active_high = of_property_read_bool(node,
+		"ath,led-active-high");
+
+	mac = of_get_mac_address(node);
+	if (!IS_ERR_OR_NULL(mac)) {
+		memcpy(priv->mac, mac, ETH_ALEN);
+		dev_info(dev, "mtd mac %pM\n", priv->mac);
+	} else {
+		random_ether_addr(priv->mac);
+		dev_info(dev, "random mac %pM\n", priv->mac);
+	}
+
+	priv->pdata.macaddr = priv->mac;
+
+	ath9k_fixups[ath9k_num_fixups] = priv;
+	ath9k_num_fixups++;
+
+	return 0;
+}
+
+static const struct of_device_id ath9k_fixup_of_match[] = {
+	{ .compatible = "brcm,ath9k-fixup" },
+	{ /* sentinel */ }
+};
+
+static struct platform_driver ath9k_fixup_driver = {
+	.probe = ath9k_fixup_probe,
+	.driver	= {
+		.name = "ath9k-fixup",
+		.of_match_table = ath9k_fixup_of_match,
+	},
+};
+
+int __init ath9k_fixup_init(void)
+{
+	int ret = platform_driver_register(&ath9k_fixup_driver);
+	if (ret)
+		pr_err("ath9k_fixup: Error registering platform driver!\n");
+	return ret;
+}
+late_initcall(ath9k_fixup_init);
diff --git a/target/linux/bmips/patches-5.10/610-mips-bmips-add-pci-fixups.patch b/target/linux/bmips/patches-5.10/610-mips-bmips-add-pci-fixups.patch
index cc393c4223..5f68308986 100644
--- a/target/linux/bmips/patches-5.10/610-mips-bmips-add-pci-fixups.patch
+++ b/target/linux/bmips/patches-5.10/610-mips-bmips-add-pci-fixups.patch
@@ -3,4 +3,4 @@
 @@ -1,2 +1,3 @@
  # SPDX-License-Identifier: GPL-2.0-only
  obj-y		+= setup.o irq.o dma.o
-+obj-y		+= b43-sprom.o
++obj-y		+= ath9k-fixup.o b43-sprom.o