Northstar is a family of SoCs used in home routers. They have USB 2.0
and 3.0 controllers with PHYs that need to be properly initialized.
This driver provides PHY init support in a generic way and can be bound
with XHCI controller driver.
Signed-off-by: Rafał Miłecki <zajec5@xxxxxxxxx>
---
.../devicetree/bindings/usb/ns-usb3-phy.txt | 14 ++
drivers/usb/phy/Kconfig | 8 +
drivers/usb/phy/Makefile | 1 +
drivers/usb/phy/phy-bcm-ns-usb3.c | 256 +++++++++++++++++++++
include/linux/bcma/bcma_driver_chipcommon.h | 3 +
5 files changed, 282 insertions(+)
create mode 100644 Documentation/devicetree/bindings/usb/ns-usb3-phy.txt
create mode 100644 drivers/usb/phy/phy-bcm-ns-usb3.c
diff --git a/Documentation/devicetree/bindings/usb/ns-usb3-phy.txt b/Documentation/devicetree/bindings/usb/ns-usb3-phy.txt
new file mode 100644
index 0000000..ded03a9
--- /dev/null
+++ b/Documentation/devicetree/bindings/usb/ns-usb3-phy.txt
@@ -0,0 +1,14 @@
+Driver for Broadcom Northstar USB 3.0 PHY
+
+Required properties:
+- compatible: brcm,ns-usb3-phy
+- bus: phandle of brcm,bus-axi
+
+To initialize USB 3.0 PHY driver needs to access various bus cores (devices).
+This is why phandle to bcma bus is needed.
+
+Example:
+ usb3-phy {
+ compatible = "brcm,ns-usb3-phy";
+ bus = <&axi>;
+ };
diff --git a/drivers/usb/phy/Kconfig b/drivers/usb/phy/Kconfig
index c690474..aa28ea7 100644
--- a/drivers/usb/phy/Kconfig
+++ b/drivers/usb/phy/Kconfig
@@ -18,6 +18,14 @@ config AB8500_USB
This transceiver supports high and full speed devices plus,
in host mode, low speed.
+config BCM_NS_USB3_PHY
+ tristate "Broadcom Northstar USB 3.0 PHY Driver"
+ depends on BCMA
+ select USB_PHY
+ help
+ Enable this to support USB 3.0 PHY connected to the USB controller on
+ bcma bus.
+
config FSL_USB2_OTG
bool "Freescale USB OTG Transceiver Driver"
depends on USB_EHCI_FSL && USB_FSL_USB2 && USB_OTG_FSM && PM
diff --git a/drivers/usb/phy/Makefile b/drivers/usb/phy/Makefile
index b433e5d..5247572 100644
--- a/drivers/usb/phy/Makefile
+++ b/drivers/usb/phy/Makefile
@@ -7,6 +7,7 @@ obj-$(CONFIG_OF) += of.o
# transceiver drivers, keep the list sorted
obj-$(CONFIG_AB8500_USB) += phy-ab8500-usb.o
+obj-$(CONFIG_BCM_NS_USB3_PHY) += phy-bcm-ns-usb3.o
obj-$(CONFIG_FSL_USB2_OTG) += phy-fsl-usb.o
obj-$(CONFIG_ISP1301_OMAP) += phy-isp1301-omap.o
obj-$(CONFIG_NOP_USB_XCEIV) += phy-generic.o
diff --git a/drivers/usb/phy/phy-bcm-ns-usb3.c b/drivers/usb/phy/phy-bcm-ns-usb3.c
new file mode 100644
index 0000000..23c95f4
--- /dev/null
+++ b/drivers/usb/phy/phy-bcm-ns-usb3.c
@@ -0,0 +1,256 @@
+/*
+ * Broadcom Northstar USB 3.0 PHY Driver
+ *
+ * Copyright (C) 2016 Rafał Miłecki <zajec5@xxxxxxxxx>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ */
+
+#include <linux/bcma/bcma.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/of_platform.h>
+#include <linux/usb/otg.h>
+#include <linux/slab.h>
+#include <linux/delay.h>
+#include <linux/err.h>
+
+#define BCM_NS_USB3_MII_MNG_TIMEOUT 1000 /* us */
+
+struct bcm_ns_usb3 {
+ struct device *dev;
+ struct bcma_bus *bus;
+ struct bcma_device *core;
+ struct usb_phy phy;
+};
+
+static inline struct bcm_ns_usb3 *phy_to_usb3(struct usb_phy *phy)
+{
+ return container_of(phy, struct bcm_ns_usb3, phy);
+}
+
+static bool bcm_ns_usb3_wait_reg(struct bcm_ns_usb3 *usb3, void __iomem *addr,
+ u32 mask, u32 value, int timeout)
+{
+ unsigned long deadline = jiffies + timeout;
+ u32 val;
+
+ do {
+ val = readl(addr);
+ if ((val & mask) == value)
+ return true;
+ cpu_relax();
+ udelay(10);
+ } while (!time_after_eq(jiffies, deadline));
+
+ dev_err(usb3->dev, "Timeout waiting for register %p\n", addr);
+
+ return false;
+}
+
+static inline bool bcm_ns_usb3_mii_mng_wait_idle(struct bcm_ns_usb3 *usb3)
+{
+ struct bcma_drv_cc_b *ccb = &usb3->bus->drv_cc_b;
+
+ return bcm_ns_usb3_wait_reg(usb3, ccb->mii + BCMA_CCB_MII_MNG_CTL,
+ 0x0100, 0x0000,
+ BCM_NS_USB3_MII_MNG_TIMEOUT);
+}
+
+static void bcm_ns_usb3_mii_mng_write32(struct bcm_ns_usb3 *usb3, u32 value)
+{
+ struct bcma_drv_cc_b *ccb = &usb3->bus->drv_cc_b;
+
+ bcm_ns_usb3_mii_mng_wait_idle(usb3);
+
+ iowrite32(value, ccb->mii + BCMA_CCB_MII_MNG_CMD_DATA);
+}
+
+static void bcm_ns_usb3_phy_init_ns_bx(struct bcm_ns_usb3 *usb3)
+{
+ struct bcma_drv_cc_b *ccb = &usb3->bus->drv_cc_b;
+
+ /* Enable MDIO. Setting MDCDIV as 26 */
+ iowrite32(0x0000009a, ccb->mii + BCMA_CCB_MII_MNG_CTL);
+ udelay(2);
+
+ /* USB3 PLL Block */
+ bcm_ns_usb3_mii_mng_write32(usb3, 0x587e8000);
+
+ /* Assert Ana_Pllseq start */
+ bcm_ns_usb3_mii_mng_write32(usb3, 0x58061000);
+
+ /* Assert CML Divider ratio to 26 */
+ bcm_ns_usb3_mii_mng_write32(usb3, 0x582a6400);
+
+ /* Asserting PLL Reset */
+ bcm_ns_usb3_mii_mng_write32(usb3, 0x582ec000);
+
+ /* Deaaserting PLL Reset */
+ bcm_ns_usb3_mii_mng_write32(usb3, 0x582e8000);
+
+ /* Waiting MII Mgt interface idle */
+ bcm_ns_usb3_mii_mng_wait_idle(usb3);
+
+ /* Deasserting USB3 system reset */
+ bcma_awrite32(usb3->core, BCMA_RESET_CTL, 0);
+
+ /* PLL frequency monitor enable */
+ bcm_ns_usb3_mii_mng_write32(usb3, 0x58069000);
+
+ /* PIPE Block */
+ bcm_ns_usb3_mii_mng_write32(usb3, 0x587e8060);
+
+ /* CMPMAX & CMPMINTH setting */
+ bcm_ns_usb3_mii_mng_write32(usb3, 0x580af30d);
+
+ /* DEGLITCH MIN & MAX setting */
+ bcm_ns_usb3_mii_mng_write32(usb3, 0x580e6302);
+
+ /* TXPMD block */
+ bcm_ns_usb3_mii_mng_write32(usb3, 0x587e8040);
+
+ /* Enabling SSC */
+ bcm_ns_usb3_mii_mng_write32(usb3, 0x58061003);
+
+ /* Waiting MII Mgt interface idle */
+ bcm_ns_usb3_mii_mng_wait_idle(usb3);
+}
+
+static void bcm_ns_usb3_phy_init_ns_ax(struct bcm_ns_usb3 *usb3)
+{
+ struct bcma_drv_cc_b *ccb = &usb3->bus->drv_cc_b;
+
+ /* Enable MDIO. Setting MDCDIV as 26 */
+ iowrite32(0x0000009a, ccb->mii + BCMA_CCB_MII_MNG_CTL);
+ udelay(2);
+
+ /* PLL30 block */
+ bcm_ns_usb3_mii_mng_write32(usb3, 0x587e8000);
+
+ bcm_ns_usb3_mii_mng_write32(usb3, 0x582a6400);
+
+ bcm_ns_usb3_mii_mng_write32(usb3, 0x587e80e0);
+
+ bcm_ns_usb3_mii_mng_write32(usb3, 0x580a009c);
+
+ /* Enable SSC */
+ bcm_ns_usb3_mii_mng_write32(usb3, 0x587e8040);
+
+ bcm_ns_usb3_mii_mng_write32(usb3, 0x580a21d3);
+
+ bcm_ns_usb3_mii_mng_write32(usb3, 0x58061003);
+
+ /* Waiting MII Mgt interface idle */
+ bcm_ns_usb3_mii_mng_wait_idle(usb3);
+
+ /* Deasserting USB3 system reset */
+ bcma_awrite32(usb3->core, BCMA_RESET_CTL, 0);
+}
+
+static int bcm_ns_usb3_phy_init(struct usb_phy *phy)
+{
+ struct bcm_ns_usb3 *usb3 = phy_to_usb3(phy);
+ struct bcma_chipinfo *chipinfo = &usb3->bus->chipinfo;
+
+ /* Perform USB3 system soft reset */
+ bcma_awrite32(usb3->core, BCMA_RESET_CTL, BCMA_RESET_CTL_RESET);
+
+ if (chipinfo->id == BCMA_CHIP_ID_BCM53018 ||
+ (chipinfo->id == BCMA_CHIP_ID_BCM4707 && (chipinfo->rev == 4 || chipinfo->rev == 6)) ||
+ chipinfo->id == BCMA_CHIP_ID_BCM47094) {
+ bcm_ns_usb3_phy_init_ns_bx(usb3);
+ } else if (chipinfo->id == BCMA_CHIP_ID_BCM4707) {
+ bcm_ns_usb3_phy_init_ns_ax(usb3);
+ } else {
+ WARN_ON(1);
+ return -ENOTSUPP;
+ }
+
+ return 0;
+}
+
+static struct bcma_bus *bcm_ns_usb3_get_bus(struct platform_device *pdev)
+{
+ struct device_node *node;
+ struct platform_device *bus_pdev;
+
+ node = of_parse_phandle(pdev->dev.of_node, "bus", 0);
+ if (!node)
+ return NULL;
+
+ bus_pdev = of_find_device_by_node(node);
+ if (!bus_pdev)
+ return NULL;
+
+ return platform_get_drvdata(bus_pdev);
+}
+
+static int bcm_ns_usb3_probe(struct platform_device *pdev)
+{
+ struct bcm_ns_usb3 *usb3;
+ struct bcma_bus *bus;
+ int err;
+
+ bus = bcm_ns_usb3_get_bus(pdev);
+ if (!bus)
+ return -EPROBE_DEFER;
+
+ usb3 = devm_kzalloc(&pdev->dev, sizeof(*usb3), GFP_KERNEL);
+ if (!usb3)
+ return -ENOMEM;
+
+ usb3->dev = &pdev->dev;
+ usb3->bus = bus;
+ usb3->phy.dev = usb3->dev;
+ usb3->phy.label = "bcm_ns_usb3";
+ usb3->phy.init = bcm_ns_usb3_phy_init;
+
+ usb3->core = bcma_find_core(usb3->bus, BCMA_CORE_NS_USB30);
+ if (!usb3->core)
+ return -ENODEV;
+
+ err = usb_add_phy(&usb3->phy, USB_PHY_TYPE_USB3);
+ if (err) {
+ dev_err(usb3->dev, "Failed to add PHY: %d\n", err);
+ return err;
+ }
+
+ platform_set_drvdata(pdev, usb3);
+
+ dev_info(usb3->dev, "Registered driver for Broadcom Northstar USB PHY for bcma chip with id %d\n",
+ usb3->bus->chipinfo.id);
+
+ return 0;
+}
+
+static int bcm_ns_usb3_remove(struct platform_device *pdev)
+{
+ struct bcm_ns_usb3 *usb3 = platform_get_drvdata(pdev);
+
+ usb_remove_phy(&usb3->phy);
+
+ return 0;
+}
+
+static const struct of_device_id bcm_ns_usb3_id_table[] = {
+ { .compatible = "brcm,ns-usb3-phy", },
+ {},
+};
+MODULE_DEVICE_TABLE(of, bcm_ns_usb3_id_table);
+
+static struct platform_driver bcm_ns_usb3_driver = {
+ .probe = bcm_ns_usb3_probe,
+ .remove = bcm_ns_usb3_remove,
+ .driver = {
+ .owner = THIS_MODULE,
+ .name = "bcm_ns_usb3",
+ .of_match_table = bcm_ns_usb3_id_table,
+ },
+};
+module_platform_driver(bcm_ns_usb3_driver);
+
+MODULE_LICENSE("GPL");
diff --git a/include/linux/bcma/bcma_driver_chipcommon.h b/include/linux/bcma/bcma_driver_chipcommon.h
index 846513c..3a86e48 100644
--- a/include/linux/bcma/bcma_driver_chipcommon.h
+++ b/include/linux/bcma/bcma_driver_chipcommon.h
@@ -504,6 +504,9 @@
#define BCMA_CC_PMU1_PLL0_PC2_NDIV_INT_MASK 0x1ff00000
#define BCMA_CC_PMU1_PLL0_PC2_NDIV_INT_SHIFT 20
+#define BCMA_CCB_MII_MNG_CTL 0x0000
+#define BCMA_CCB_MII_MNG_CMD_DATA 0x0004
+
/* BCM4331 ChipControl numbers. */
#define BCMA_CHIPCTL_4331_BT_COEXIST BIT(0) /* 0 disable */
#define BCMA_CHIPCTL_4331_SECI BIT(1) /* 0 SECI is disabled (JATG functional) */
--
1.8.4.5
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