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linux/drivers/phy/broadcom/phy-bcm-ns-usb3.c
Rafał Miłecki af850e14a7 phy: bcm-ns-usb3: add MDIO driver using proper bus layer 
As USB 3.0 PHY is attached to the MDIO bus this module should provide a
MDIO driver and use a proper bus layer. This is a proper (cleaner)
solution which doesn't require code to know this specific MDIO bus
details. It also allows reusing the driver with other MDIO buses.

For now keep platform device support in place. We may consider dropping
it once MDIO bindings gets used "everywhere".

Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>
2017-06-16 13:22:26 +05:30

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/*
* 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");
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