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u-boot/drivers/usb/host/xhci-mtk.c
Chunfeng Yun 04232f78b3 usb: xhci-mtk: support option to disable ports 
Add support to disable specific ports, it's useful for some
scenarios:
1. usb3 PHY is shared whith PCIe or SATA, the corresponding
   usb3 port can be disabled;
2. some usb2 or usb3 ports are not used on special platforms,
   they should be disabled to save power.

Signed-off-by: Chunfeng Yun <chunfeng.yun@mediatek.com>
2021-02-10 22:23:24 +01:00

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// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright (c) 2019 MediaTek, Inc.
* Authors: Chunfeng Yun <chunfeng.yun@mediatek.com>
*/
#include <clk.h>
#include <common.h>
#include <dm.h>
#include <dm/device_compat.h>
#include <dm/devres.h>
#include <generic-phy.h>
#include <malloc.h>
#include <power/regulator.h>
#include <usb.h>
#include <usb/xhci.h>
#include <linux/errno.h>
#include <linux/compat.h>
#include <linux/iopoll.h>
/* IPPC (IP Port Control) registers */
#define IPPC_IP_PW_CTRL0 0x00
#define CTRL0_IP_SW_RST BIT(0)
#define IPPC_IP_PW_CTRL1 0x04
#define CTRL1_IP_HOST_PDN BIT(0)
#define IPPC_IP_PW_STS1 0x10
#define STS1_IP_SLEEP_STS BIT(30)
#define STS1_U3_MAC_RST BIT(16)
#define STS1_XHCI_RST BIT(11)
#define STS1_SYS125_RST BIT(10)
#define STS1_REF_RST BIT(8)
#define STS1_SYSPLL_STABLE BIT(0)
#define IPPC_IP_XHCI_CAP 0x24
#define CAP_U3_PORT_NUM(p) ((p) & 0xff)
#define CAP_U2_PORT_NUM(p) (((p) >> 8) & 0xff)
#define IPPC_U3_CTRL_0P 0x30
#define CTRL_U3_PORT_HOST_SEL BIT(2)
#define CTRL_U3_PORT_PDN BIT(1)
#define CTRL_U3_PORT_DIS BIT(0)
#define IPPC_U2_CTRL_0P 0x50
#define CTRL_U2_PORT_HOST_SEL BIT(2)
#define CTRL_U2_PORT_PDN BIT(1)
#define CTRL_U2_PORT_DIS BIT(0)
#define IPPC_U3_CTRL(p) (IPPC_U3_CTRL_0P + ((p) * 0x08))
#define IPPC_U2_CTRL(p) (IPPC_U2_CTRL_0P + ((p) * 0x08))
struct mtk_xhci {
struct xhci_ctrl ctrl; /* Needs to come first in this struct! */
struct xhci_hccr *hcd;
void __iomem *ippc;
struct udevice *dev;
struct udevice *vusb33_supply;
struct udevice *vbus_supply;
struct clk_bulk clks;
struct phy_bulk phys;
int num_u2ports;
int num_u3ports;
u32 u3p_dis_msk;
u32 u2p_dis_msk;
};
static int xhci_mtk_host_enable(struct mtk_xhci *mtk)
{
int u3_ports_disabed = 0;
u32 value;
u32 check_val;
int ret;
int i;
/* power on host ip */
clrbits_le32(mtk->ippc + IPPC_IP_PW_CTRL1, CTRL1_IP_HOST_PDN);
/* power on and enable u3 ports except skipped ones */
for (i = 0; i < mtk->num_u3ports; i++) {
if (BIT(i) & mtk->u3p_dis_msk) {
u3_ports_disabed++;
continue;
}
clrsetbits_le32(mtk->ippc + IPPC_U3_CTRL(i),
CTRL_U3_PORT_PDN | CTRL_U3_PORT_DIS,
CTRL_U3_PORT_HOST_SEL);
}
/* power on and enable u2 ports except skipped ones */
for (i = 0; i < mtk->num_u2ports; i++) {
if (BIT(i) & mtk->u2p_dis_msk)
continue;
clrsetbits_le32(mtk->ippc + IPPC_U2_CTRL(i),
CTRL_U2_PORT_PDN | CTRL_U2_PORT_DIS,
CTRL_U2_PORT_HOST_SEL);
}
/*
* wait for clocks to be stable, and clock domains reset to
* be inactive after power on and enable ports
*/
check_val = STS1_SYSPLL_STABLE | STS1_REF_RST |
STS1_SYS125_RST | STS1_XHCI_RST;
if (mtk->num_u3ports > u3_ports_disabed)
check_val |= STS1_U3_MAC_RST;
ret = readl_poll_timeout(mtk->ippc + IPPC_IP_PW_STS1, value,
(check_val == (value & check_val)), 20000);
if (ret)
dev_err(mtk->dev, "clocks are not stable 0x%x!\n", value);
return ret;
}
static int xhci_mtk_host_disable(struct mtk_xhci *mtk)
{
int i;
/* power down all u3 ports */
for (i = 0; i < mtk->num_u3ports; i++)
setbits_le32(mtk->ippc + IPPC_U3_CTRL(i), CTRL_U3_PORT_PDN);
/* power down all u2 ports */
for (i = 0; i < mtk->num_u2ports; i++)
setbits_le32(mtk->ippc + IPPC_U2_CTRL(i), CTRL_U2_PORT_PDN);
/* power down host ip */
setbits_le32(mtk->ippc + IPPC_IP_PW_CTRL1, CTRL1_IP_HOST_PDN);
return 0;
}
static int xhci_mtk_ssusb_init(struct mtk_xhci *mtk)
{
u32 value;
/* reset whole ip */
setbits_le32(mtk->ippc + IPPC_IP_PW_CTRL0, CTRL0_IP_SW_RST);
udelay(1);
clrbits_le32(mtk->ippc + IPPC_IP_PW_CTRL0, CTRL0_IP_SW_RST);
value = readl(mtk->ippc + IPPC_IP_XHCI_CAP);
mtk->num_u3ports = CAP_U3_PORT_NUM(value);
mtk->num_u2ports = CAP_U2_PORT_NUM(value);
dev_info(mtk->dev, "u2p:%d, u3p:%d\n",
mtk->num_u2ports, mtk->num_u3ports);
return xhci_mtk_host_enable(mtk);
}
static int xhci_mtk_ofdata_get(struct mtk_xhci *mtk)
{
struct udevice *dev = mtk->dev;
int ret = 0;
mtk->hcd = devfdt_remap_addr_name(dev, "mac");
if (!mtk->hcd) {
dev_err(dev, "failed to get xHCI base address\n");
return -ENXIO;
}
mtk->ippc = devfdt_remap_addr_name(dev, "ippc");
if (!mtk->ippc) {
dev_err(dev, "failed to get IPPC base address\n");
return -ENXIO;
}
dev_info(dev, "hcd: 0x%p, ippc: 0x%p\n", mtk->hcd, mtk->ippc);
ret = clk_get_bulk(dev, &mtk->clks);
if (ret) {
dev_err(dev, "failed to get clocks %d!\n", ret);
return ret;
}
ret = device_get_supply_regulator(dev, "vusb33-supply",
&mtk->vusb33_supply);
if (ret)
debug("can't get vusb33 regulator %d!\n", ret);
ret = device_get_supply_regulator(dev, "vbus-supply",
&mtk->vbus_supply);
if (ret)
debug("can't get vbus regulator %d!\n", ret);
/* optional properties to disable ports, ignore the error */
dev_read_u32(dev, "mediatek,u3p-dis-msk", &mtk->u3p_dis_msk);
dev_read_u32(dev, "mediatek,u2p-dis-msk", &mtk->u2p_dis_msk);
dev_info(dev, "ports disabled mask: u3p-0x%x, u2p-0x%x\n",
mtk->u3p_dis_msk, mtk->u2p_dis_msk);
return 0;
}
static int xhci_mtk_ldos_enable(struct mtk_xhci *mtk)
{
int ret;
ret = regulator_set_enable(mtk->vusb33_supply, true);
if (ret < 0 && ret != -ENOSYS) {
dev_err(mtk->dev, "failed to enable vusb33 %d!\n", ret);
return ret;
}
ret = regulator_set_enable(mtk->vbus_supply, true);
if (ret < 0 && ret != -ENOSYS) {
dev_err(mtk->dev, "failed to enable vbus %d!\n", ret);
regulator_set_enable(mtk->vusb33_supply, false);
return ret;
}
return 0;
}
static void xhci_mtk_ldos_disable(struct mtk_xhci *mtk)
{
regulator_set_enable(mtk->vbus_supply, false);
regulator_set_enable(mtk->vusb33_supply, false);
}
static int xhci_mtk_phy_setup(struct mtk_xhci *mtk)
{
struct udevice *dev = mtk->dev;
struct phy_bulk *phys = &mtk->phys;
int ret;
ret = generic_phy_get_bulk(dev, phys);
if (ret)
return ret;
ret = generic_phy_init_bulk(phys);
if (ret)
return ret;
ret = generic_phy_power_on_bulk(phys);
if (ret)
generic_phy_exit_bulk(phys);
return ret;
}
static void xhci_mtk_phy_shutdown(struct mtk_xhci *mtk)
{
generic_phy_power_off_bulk(&mtk->phys);
generic_phy_exit_bulk(&mtk->phys);
}
static int xhci_mtk_probe(struct udevice *dev)
{
struct mtk_xhci *mtk = dev_get_priv(dev);
struct xhci_hcor *hcor;
int ret;
mtk->dev = dev;
ret = xhci_mtk_ofdata_get(mtk);
if (ret)
return ret;
ret = xhci_mtk_ldos_enable(mtk);
if (ret)
goto ldos_err;
ret = clk_enable_bulk(&mtk->clks);
if (ret)
goto clks_err;
ret = xhci_mtk_phy_setup(mtk);
if (ret)
goto phys_err;
ret = xhci_mtk_ssusb_init(mtk);
if (ret)
goto ssusb_init_err;
mtk->ctrl.quirks = XHCI_MTK_HOST;
hcor = (struct xhci_hcor *)((uintptr_t)mtk->hcd +
HC_LENGTH(xhci_readl(&mtk->hcd->cr_capbase)));
return xhci_register(dev, mtk->hcd, hcor);
ssusb_init_err:
xhci_mtk_phy_shutdown(mtk);
phys_err:
clk_disable_bulk(&mtk->clks);
clks_err:
xhci_mtk_ldos_disable(mtk);
ldos_err:
return ret;
}
static int xhci_mtk_remove(struct udevice *dev)
{
struct mtk_xhci *mtk = dev_get_priv(dev);
xhci_deregister(dev);
xhci_mtk_host_disable(mtk);
xhci_mtk_ldos_disable(mtk);
clk_disable_bulk(&mtk->clks);
return 0;
}
static const struct udevice_id xhci_mtk_ids[] = {
{ .compatible = "mediatek,mtk-xhci" },
{ }
};
U_BOOT_DRIVER(usb_xhci) = {
.name = "xhci-mtk",
.id = UCLASS_USB,
.of_match = xhci_mtk_ids,
.probe = xhci_mtk_probe,
.remove = xhci_mtk_remove,
.ops = &xhci_usb_ops,
.bind = dm_scan_fdt_dev,
.priv_auto = sizeof(struct mtk_xhci),
.flags = DM_FLAG_ALLOC_PRIV_DMA,
};
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