phy: add support for bcm6368 usbh phy

Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>
Reviewed-by: Daniel Schwierzeck <daniel.schwierzeck@gmail.com>

1 files changed, 196 insertions, 0 deletions

diff --git a/drivers/phy/bcm6368-usbh-phy.c b/drivers/phy/bcm6368-usbh-phy.c
new file mode 100644
index 0000000000..71abc0fcc4
--- /dev/null
+++ b/drivers/phy/bcm6368-usbh-phy.c
@@ -0,0 +1,196 @@
+/*
+ * 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>
+ *
+ * SPDX-License-Identifier: GPL-2.0+
+ */
+
+#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;
+	fdt_addr_t addr;
+	fdt_size_t size;
+	int ret;
+
+	addr = devfdt_get_addr_size_index(dev, 0, &size);
+	if (addr == FDT_ADDR_T_NONE)
+		return -EINVAL;
+
+	priv->regs = ioremap(addr, size);
+	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,
+};