bcm6368-usbh-phy.c
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// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright (C) 2018 Álvaro Fernández Rojas <noltari@gmail.com>
*
* Derived from linux/arch/mips/bcm63xx/usb-common.c:
* Copyright 2008 Maxime Bizon <mbizon@freebox.fr>
* Copyright 2013 Florian Fainelli <florian@openwrt.org>
*/
#include <common.h>
#include <clk.h>
#include <dm.h>
#include <generic-phy.h>
#include <power-domain.h>
#include <reset.h>
#include <asm/io.h>
#include <dm/device.h>
/* USBH PLL Control register */
#define USBH_PLL_REG 0x18
#define USBH_PLL_IDDQ_PWRDN BIT(9)
#define USBH_PLL_PWRDN_DELAY BIT(10)
/* USBH Swap Control register */
#define USBH_SWAP_REG 0x1c
#define USBH_SWAP_OHCI_DATA BIT(0)
#define USBH_SWAP_OHCI_ENDIAN BIT(1)
#define USBH_SWAP_EHCI_DATA BIT(3)
#define USBH_SWAP_EHCI_ENDIAN BIT(4)
/* USBH Setup register */
#define USBH_SETUP_REG 0x28
#define USBH_SETUP_IOC BIT(4)
#define USBH_SETUP_IPP BIT(5)
struct bcm6368_usbh_hw {
uint32_t setup_clr;
uint32_t pll_clr;
};
struct bcm6368_usbh_priv {
const struct bcm6368_usbh_hw *hw;
void __iomem *regs;
};
static int bcm6368_usbh_init(struct phy *phy)
{
struct bcm6368_usbh_priv *priv = dev_get_priv(phy->dev);
const struct bcm6368_usbh_hw *hw = priv->hw;
/* configure to work in native cpu endian */
clrsetbits_be32(priv->regs + USBH_SWAP_REG,
USBH_SWAP_EHCI_ENDIAN | USBH_SWAP_OHCI_ENDIAN,
USBH_SWAP_EHCI_DATA | USBH_SWAP_OHCI_DATA);
/* setup config */
if (hw->setup_clr)
clrbits_be32(priv->regs + USBH_SETUP_REG, hw->setup_clr);
setbits_be32(priv->regs + USBH_SETUP_REG, USBH_SETUP_IOC);
/* enable pll control */
if (hw->pll_clr)
clrbits_be32(priv->regs + USBH_PLL_REG, hw->pll_clr);
return 0;
}
static struct phy_ops bcm6368_usbh_ops = {
.init = bcm6368_usbh_init,
};
static const struct bcm6368_usbh_hw bcm6328_hw = {
.pll_clr = USBH_PLL_IDDQ_PWRDN | USBH_PLL_PWRDN_DELAY,
.setup_clr = 0,
};
static const struct bcm6368_usbh_hw bcm6362_hw = {
.pll_clr = 0,
.setup_clr = 0,
};
static const struct bcm6368_usbh_hw bcm6368_hw = {
.pll_clr = 0,
.setup_clr = 0,
};
static const struct bcm6368_usbh_hw bcm63268_hw = {
.pll_clr = USBH_PLL_IDDQ_PWRDN | USBH_PLL_PWRDN_DELAY,
.setup_clr = USBH_SETUP_IPP,
};
static const struct udevice_id bcm6368_usbh_ids[] = {
{
.compatible = "brcm,bcm6328-usbh",
.data = (ulong)&bcm6328_hw,
}, {
.compatible = "brcm,bcm6362-usbh",
.data = (ulong)&bcm6362_hw,
}, {
.compatible = "brcm,bcm6368-usbh",
.data = (ulong)&bcm6368_hw,
}, {
.compatible = "brcm,bcm63268-usbh",
.data = (ulong)&bcm63268_hw,
}, { /* sentinel */ }
};
static int bcm6368_usbh_probe(struct udevice *dev)
{
struct bcm6368_usbh_priv *priv = dev_get_priv(dev);
const struct bcm6368_usbh_hw *hw =
(const struct bcm6368_usbh_hw *)dev_get_driver_data(dev);
#if defined(CONFIG_POWER_DOMAIN)
struct power_domain pwr_dom;
#endif
struct reset_ctl rst_ctl;
struct clk clk;
int ret;
priv->regs = dev_remap_addr(dev);
if (!priv->regs)
return -EINVAL;
priv->hw = hw;
/* enable usbh clock */
ret = clk_get_by_name(dev, "usbh", &clk);
if (ret < 0)
return ret;
ret = clk_enable(&clk);
if (ret < 0)
return ret;
ret = clk_free(&clk);
if (ret < 0)
return ret;
#if defined(CONFIG_POWER_DOMAIN)
/* enable power domain */
ret = power_domain_get(dev, &pwr_dom);
if (ret < 0)
return ret;
ret = power_domain_on(&pwr_dom);
if (ret < 0)
return ret;
ret = power_domain_free(&pwr_dom);
if (ret < 0)
return ret;
#endif
/* perform reset */
ret = reset_get_by_index(dev, 0, &rst_ctl);
if (ret < 0)
return ret;
ret = reset_deassert(&rst_ctl);
if (ret < 0)
return ret;
ret = reset_free(&rst_ctl);
if (ret < 0)
return ret;
/* enable usb_ref clock */
ret = clk_get_by_name(dev, "usb_ref", &clk);
if (!ret) {
ret = clk_enable(&clk);
if (ret < 0)
return ret;
ret = clk_free(&clk);
if (ret < 0)
return ret;
}
mdelay(100);
return 0;
}
U_BOOT_DRIVER(bcm6368_usbh) = {
.name = "bcm6368-usbh",
.id = UCLASS_PHY,
.of_match = bcm6368_usbh_ids,
.ops = &bcm6368_usbh_ops,
.priv_auto_alloc_size = sizeof(struct bcm6368_usbh_priv),
.probe = bcm6368_usbh_probe,
};