406 lines
9.9 KiB
C
406 lines
9.9 KiB
C
/*
|
|
* Broadcom Northstar USB 3.0 PHY Driver
|
|
*
|
|
* Copyright (C) 2016 Rafał Miłecki <rafal@milecki.pl>
|
|
* Copyright (C) 2016 Broadcom
|
|
*
|
|
* All magic values used for initialization (and related comments) were obtained
|
|
* from Broadcom's SDK:
|
|
* Copyright (c) Broadcom Corp, 2012
|
|
*
|
|
* 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/delay.h>
|
|
#include <linux/err.h>
|
|
#include <linux/mdio.h>
|
|
#include <linux/module.h>
|
|
#include <linux/of_address.h>
|
|
#include <linux/of_platform.h>
|
|
#include <linux/platform_device.h>
|
|
#include <linux/phy/phy.h>
|
|
#include <linux/slab.h>
|
|
|
|
#define BCM_NS_USB3_MII_MNG_TIMEOUT_US 1000 /* usecs */
|
|
|
|
#define BCM_NS_USB3_PHY_BASE_ADDR_REG 0x1f
|
|
#define BCM_NS_USB3_PHY_PLL30_BLOCK 0x8000
|
|
#define BCM_NS_USB3_PHY_TX_PMD_BLOCK 0x8040
|
|
#define BCM_NS_USB3_PHY_PIPE_BLOCK 0x8060
|
|
|
|
/* Registers of PLL30 block */
|
|
#define BCM_NS_USB3_PLL_CONTROL 0x01
|
|
#define BCM_NS_USB3_PLLA_CONTROL0 0x0a
|
|
#define BCM_NS_USB3_PLLA_CONTROL1 0x0b
|
|
|
|
/* Registers of TX PMD block */
|
|
#define BCM_NS_USB3_TX_PMD_CONTROL1 0x01
|
|
|
|
/* Registers of PIPE block */
|
|
#define BCM_NS_USB3_LFPS_CMP 0x02
|
|
#define BCM_NS_USB3_LFPS_DEGLITCH 0x03
|
|
|
|
enum bcm_ns_family {
|
|
BCM_NS_UNKNOWN,
|
|
BCM_NS_AX,
|
|
BCM_NS_BX,
|
|
};
|
|
|
|
struct bcm_ns_usb3 {
|
|
struct device *dev;
|
|
enum bcm_ns_family family;
|
|
void __iomem *dmp;
|
|
void __iomem *ccb_mii;
|
|
struct mdio_device *mdiodev;
|
|
struct phy *phy;
|
|
|
|
int (*phy_write)(struct bcm_ns_usb3 *usb3, u16 reg, u16 value);
|
|
};
|
|
|
|
static const struct of_device_id bcm_ns_usb3_id_table[] = {
|
|
{
|
|
.compatible = "brcm,ns-ax-usb3-phy",
|
|
.data = (int *)BCM_NS_AX,
|
|
},
|
|
{
|
|
.compatible = "brcm,ns-bx-usb3-phy",
|
|
.data = (int *)BCM_NS_BX,
|
|
},
|
|
{},
|
|
};
|
|
MODULE_DEVICE_TABLE(of, bcm_ns_usb3_id_table);
|
|
|
|
static int bcm_ns_usb3_mdio_phy_write(struct bcm_ns_usb3 *usb3, u16 reg,
|
|
u16 value)
|
|
{
|
|
return usb3->phy_write(usb3, reg, value);
|
|
}
|
|
|
|
static int bcm_ns_usb3_phy_init_ns_bx(struct bcm_ns_usb3 *usb3)
|
|
{
|
|
int err;
|
|
|
|
/* USB3 PLL Block */
|
|
err = bcm_ns_usb3_mdio_phy_write(usb3, BCM_NS_USB3_PHY_BASE_ADDR_REG,
|
|
BCM_NS_USB3_PHY_PLL30_BLOCK);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
/* Assert Ana_Pllseq start */
|
|
bcm_ns_usb3_mdio_phy_write(usb3, BCM_NS_USB3_PLL_CONTROL, 0x1000);
|
|
|
|
/* Assert CML Divider ratio to 26 */
|
|
bcm_ns_usb3_mdio_phy_write(usb3, BCM_NS_USB3_PLLA_CONTROL0, 0x6400);
|
|
|
|
/* Asserting PLL Reset */
|
|
bcm_ns_usb3_mdio_phy_write(usb3, BCM_NS_USB3_PLLA_CONTROL1, 0xc000);
|
|
|
|
/* Deaaserting PLL Reset */
|
|
bcm_ns_usb3_mdio_phy_write(usb3, BCM_NS_USB3_PLLA_CONTROL1, 0x8000);
|
|
|
|
/* Deasserting USB3 system reset */
|
|
writel(0, usb3->dmp + BCMA_RESET_CTL);
|
|
|
|
/* PLL frequency monitor enable */
|
|
bcm_ns_usb3_mdio_phy_write(usb3, BCM_NS_USB3_PLL_CONTROL, 0x9000);
|
|
|
|
/* PIPE Block */
|
|
bcm_ns_usb3_mdio_phy_write(usb3, BCM_NS_USB3_PHY_BASE_ADDR_REG,
|
|
BCM_NS_USB3_PHY_PIPE_BLOCK);
|
|
|
|
/* CMPMAX & CMPMINTH setting */
|
|
bcm_ns_usb3_mdio_phy_write(usb3, BCM_NS_USB3_LFPS_CMP, 0xf30d);
|
|
|
|
/* DEGLITCH MIN & MAX setting */
|
|
bcm_ns_usb3_mdio_phy_write(usb3, BCM_NS_USB3_LFPS_DEGLITCH, 0x6302);
|
|
|
|
/* TXPMD block */
|
|
bcm_ns_usb3_mdio_phy_write(usb3, BCM_NS_USB3_PHY_BASE_ADDR_REG,
|
|
BCM_NS_USB3_PHY_TX_PMD_BLOCK);
|
|
|
|
/* Enabling SSC */
|
|
bcm_ns_usb3_mdio_phy_write(usb3, BCM_NS_USB3_TX_PMD_CONTROL1, 0x1003);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int bcm_ns_usb3_phy_init_ns_ax(struct bcm_ns_usb3 *usb3)
|
|
{
|
|
int err;
|
|
|
|
/* PLL30 block */
|
|
err = bcm_ns_usb3_mdio_phy_write(usb3, BCM_NS_USB3_PHY_BASE_ADDR_REG,
|
|
BCM_NS_USB3_PHY_PLL30_BLOCK);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
bcm_ns_usb3_mdio_phy_write(usb3, BCM_NS_USB3_PLLA_CONTROL0, 0x6400);
|
|
|
|
bcm_ns_usb3_mdio_phy_write(usb3, BCM_NS_USB3_PHY_BASE_ADDR_REG, 0x80e0);
|
|
|
|
bcm_ns_usb3_mdio_phy_write(usb3, 0x02, 0x009c);
|
|
|
|
/* Enable SSC */
|
|
bcm_ns_usb3_mdio_phy_write(usb3, BCM_NS_USB3_PHY_BASE_ADDR_REG,
|
|
BCM_NS_USB3_PHY_TX_PMD_BLOCK);
|
|
|
|
bcm_ns_usb3_mdio_phy_write(usb3, 0x02, 0x21d3);
|
|
|
|
bcm_ns_usb3_mdio_phy_write(usb3, BCM_NS_USB3_TX_PMD_CONTROL1, 0x1003);
|
|
|
|
/* Deasserting USB3 system reset */
|
|
writel(0, usb3->dmp + BCMA_RESET_CTL);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int bcm_ns_usb3_phy_init(struct phy *phy)
|
|
{
|
|
struct bcm_ns_usb3 *usb3 = phy_get_drvdata(phy);
|
|
int err;
|
|
|
|
/* Perform USB3 system soft reset */
|
|
writel(BCMA_RESET_CTL_RESET, usb3->dmp + BCMA_RESET_CTL);
|
|
|
|
switch (usb3->family) {
|
|
case BCM_NS_AX:
|
|
err = bcm_ns_usb3_phy_init_ns_ax(usb3);
|
|
break;
|
|
case BCM_NS_BX:
|
|
err = bcm_ns_usb3_phy_init_ns_bx(usb3);
|
|
break;
|
|
default:
|
|
WARN_ON(1);
|
|
err = -ENOTSUPP;
|
|
}
|
|
|
|
return err;
|
|
}
|
|
|
|
static const struct phy_ops ops = {
|
|
.init = bcm_ns_usb3_phy_init,
|
|
.owner = THIS_MODULE,
|
|
};
|
|
|
|
/**************************************************
|
|
* MDIO driver code
|
|
**************************************************/
|
|
|
|
static int bcm_ns_usb3_mdiodev_phy_write(struct bcm_ns_usb3 *usb3, u16 reg,
|
|
u16 value)
|
|
{
|
|
struct mdio_device *mdiodev = usb3->mdiodev;
|
|
|
|
return mdiobus_write(mdiodev->bus, mdiodev->addr, reg, value);
|
|
}
|
|
|
|
static int bcm_ns_usb3_mdio_probe(struct mdio_device *mdiodev)
|
|
{
|
|
struct device *dev = &mdiodev->dev;
|
|
const struct of_device_id *of_id;
|
|
struct phy_provider *phy_provider;
|
|
struct device_node *syscon_np;
|
|
struct bcm_ns_usb3 *usb3;
|
|
struct resource res;
|
|
int err;
|
|
|
|
usb3 = devm_kzalloc(dev, sizeof(*usb3), GFP_KERNEL);
|
|
if (!usb3)
|
|
return -ENOMEM;
|
|
|
|
usb3->dev = dev;
|
|
usb3->mdiodev = mdiodev;
|
|
|
|
of_id = of_match_device(bcm_ns_usb3_id_table, dev);
|
|
if (!of_id)
|
|
return -EINVAL;
|
|
usb3->family = (enum bcm_ns_family)of_id->data;
|
|
|
|
syscon_np = of_parse_phandle(dev->of_node, "usb3-dmp-syscon", 0);
|
|
err = of_address_to_resource(syscon_np, 0, &res);
|
|
of_node_put(syscon_np);
|
|
if (err)
|
|
return err;
|
|
|
|
usb3->dmp = devm_ioremap_resource(dev, &res);
|
|
if (IS_ERR(usb3->dmp)) {
|
|
dev_err(dev, "Failed to map DMP regs\n");
|
|
return PTR_ERR(usb3->dmp);
|
|
}
|
|
|
|
usb3->phy_write = bcm_ns_usb3_mdiodev_phy_write;
|
|
|
|
usb3->phy = devm_phy_create(dev, NULL, &ops);
|
|
if (IS_ERR(usb3->phy)) {
|
|
dev_err(dev, "Failed to create PHY\n");
|
|
return PTR_ERR(usb3->phy);
|
|
}
|
|
|
|
phy_set_drvdata(usb3->phy, usb3);
|
|
|
|
phy_provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate);
|
|
|
|
return PTR_ERR_OR_ZERO(phy_provider);
|
|
}
|
|
|
|
static struct mdio_driver bcm_ns_usb3_mdio_driver = {
|
|
.mdiodrv = {
|
|
.driver = {
|
|
.name = "bcm_ns_mdio_usb3",
|
|
.of_match_table = bcm_ns_usb3_id_table,
|
|
},
|
|
},
|
|
.probe = bcm_ns_usb3_mdio_probe,
|
|
};
|
|
|
|
/**************************************************
|
|
* Platform driver code
|
|
**************************************************/
|
|
|
|
static int bcm_ns_usb3_wait_reg(struct bcm_ns_usb3 *usb3, void __iomem *addr,
|
|
u32 mask, u32 value, unsigned long timeout)
|
|
{
|
|
unsigned long deadline = jiffies + timeout;
|
|
u32 val;
|
|
|
|
do {
|
|
val = readl(addr);
|
|
if ((val & mask) == value)
|
|
return 0;
|
|
cpu_relax();
|
|
udelay(10);
|
|
} while (!time_after_eq(jiffies, deadline));
|
|
|
|
dev_err(usb3->dev, "Timeout waiting for register %p\n", addr);
|
|
|
|
return -EBUSY;
|
|
}
|
|
|
|
static inline int bcm_ns_usb3_mii_mng_wait_idle(struct bcm_ns_usb3 *usb3)
|
|
{
|
|
return bcm_ns_usb3_wait_reg(usb3, usb3->ccb_mii + BCMA_CCB_MII_MNG_CTL,
|
|
0x0100, 0x0000,
|
|
usecs_to_jiffies(BCM_NS_USB3_MII_MNG_TIMEOUT_US));
|
|
}
|
|
|
|
static int bcm_ns_usb3_platform_phy_write(struct bcm_ns_usb3 *usb3, u16 reg,
|
|
u16 value)
|
|
{
|
|
u32 tmp = 0;
|
|
int err;
|
|
|
|
err = bcm_ns_usb3_mii_mng_wait_idle(usb3);
|
|
if (err < 0) {
|
|
dev_err(usb3->dev, "Couldn't write 0x%08x value\n", value);
|
|
return err;
|
|
}
|
|
|
|
/* TODO: Use a proper MDIO bus layer */
|
|
tmp |= 0x58020000; /* Magic value for MDIO PHY write */
|
|
tmp |= reg << 18;
|
|
tmp |= value;
|
|
writel(tmp, usb3->ccb_mii + BCMA_CCB_MII_MNG_CMD_DATA);
|
|
|
|
return bcm_ns_usb3_mii_mng_wait_idle(usb3);
|
|
}
|
|
|
|
static int bcm_ns_usb3_probe(struct platform_device *pdev)
|
|
{
|
|
struct device *dev = &pdev->dev;
|
|
const struct of_device_id *of_id;
|
|
struct bcm_ns_usb3 *usb3;
|
|
struct resource *res;
|
|
struct phy_provider *phy_provider;
|
|
|
|
usb3 = devm_kzalloc(dev, sizeof(*usb3), GFP_KERNEL);
|
|
if (!usb3)
|
|
return -ENOMEM;
|
|
|
|
usb3->dev = dev;
|
|
|
|
of_id = of_match_device(bcm_ns_usb3_id_table, dev);
|
|
if (!of_id)
|
|
return -EINVAL;
|
|
usb3->family = (enum bcm_ns_family)of_id->data;
|
|
|
|
res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "dmp");
|
|
usb3->dmp = devm_ioremap_resource(dev, res);
|
|
if (IS_ERR(usb3->dmp)) {
|
|
dev_err(dev, "Failed to map DMP regs\n");
|
|
return PTR_ERR(usb3->dmp);
|
|
}
|
|
|
|
res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "ccb-mii");
|
|
usb3->ccb_mii = devm_ioremap_resource(dev, res);
|
|
if (IS_ERR(usb3->ccb_mii)) {
|
|
dev_err(dev, "Failed to map ChipCommon B MII regs\n");
|
|
return PTR_ERR(usb3->ccb_mii);
|
|
}
|
|
|
|
/* Enable MDIO. Setting MDCDIV as 26 */
|
|
writel(0x0000009a, usb3->ccb_mii + BCMA_CCB_MII_MNG_CTL);
|
|
|
|
/* Wait for MDIO? */
|
|
udelay(2);
|
|
|
|
usb3->phy_write = bcm_ns_usb3_platform_phy_write;
|
|
|
|
usb3->phy = devm_phy_create(dev, NULL, &ops);
|
|
if (IS_ERR(usb3->phy)) {
|
|
dev_err(dev, "Failed to create PHY\n");
|
|
return PTR_ERR(usb3->phy);
|
|
}
|
|
|
|
phy_set_drvdata(usb3->phy, usb3);
|
|
platform_set_drvdata(pdev, usb3);
|
|
|
|
phy_provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate);
|
|
if (!IS_ERR(phy_provider))
|
|
dev_info(dev, "Registered Broadcom Northstar USB 3.0 PHY driver\n");
|
|
|
|
return PTR_ERR_OR_ZERO(phy_provider);
|
|
}
|
|
|
|
static struct platform_driver bcm_ns_usb3_driver = {
|
|
.probe = bcm_ns_usb3_probe,
|
|
.driver = {
|
|
.name = "bcm_ns_usb3",
|
|
.of_match_table = bcm_ns_usb3_id_table,
|
|
},
|
|
};
|
|
|
|
static int __init bcm_ns_usb3_module_init(void)
|
|
{
|
|
int err;
|
|
|
|
/*
|
|
* For backward compatibility we register as MDIO and platform driver.
|
|
* After getting MDIO binding commonly used (e.g. switching all DT files
|
|
* to use it) we should deprecate the old binding and eventually drop
|
|
* support for it.
|
|
*/
|
|
|
|
err = mdio_driver_register(&bcm_ns_usb3_mdio_driver);
|
|
if (err)
|
|
return err;
|
|
|
|
err = platform_driver_register(&bcm_ns_usb3_driver);
|
|
if (err)
|
|
mdio_driver_unregister(&bcm_ns_usb3_mdio_driver);
|
|
|
|
return err;
|
|
}
|
|
module_init(bcm_ns_usb3_module_init);
|
|
|
|
static void __exit bcm_ns_usb3_module_exit(void)
|
|
{
|
|
platform_driver_unregister(&bcm_ns_usb3_driver);
|
|
mdio_driver_unregister(&bcm_ns_usb3_mdio_driver);
|
|
}
|
|
module_exit(bcm_ns_usb3_module_exit)
|
|
|
|
MODULE_LICENSE("GPL v2");
|