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mtu3_host.c
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mtu3_host.c
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// SPDX-License-Identifier: GPL-2.0
/*
* mtu3_dr.c - dual role switch and host glue layer
*
* Copyright (C) 2016 MediaTek Inc.
*
* Author: Chunfeng Yun <[email protected]>
*/
#include <dm/lists.h>
#include <linux/iopoll.h>
#include "mtu3.h"
#include "mtu3_dr.h"
static void host_ports_num_get(struct mtu3_host *u3h)
{
u32 xhci_cap;
xhci_cap = mtu3_readl(u3h->ippc_base, U3D_SSUSB_IP_XHCI_CAP);
u3h->u2_ports = SSUSB_IP_XHCI_U2_PORT_NUM(xhci_cap);
u3h->u3_ports = SSUSB_IP_XHCI_U3_PORT_NUM(xhci_cap);
dev_dbg(u3h->dev, "host - u2_ports:%d, u3_ports:%d\n",
u3h->u2_ports, u3h->u3_ports);
}
/* only configure ports will be used later */
static int ssusb_host_enable(struct mtu3_host *u3h)
{
void __iomem *ibase = u3h->ippc_base;
int num_u3p = u3h->u3_ports;
int num_u2p = u3h->u2_ports;
int u3_ports_disabed;
u32 check_clk;
u32 value;
int i;
/* power on host ip */
mtu3_clrbits(ibase, U3D_SSUSB_IP_PW_CTRL1, SSUSB_IP_HOST_PDN);
/* power on and enable u3 ports except skipped ones */
u3_ports_disabed = 0;
for (i = 0; i < num_u3p; i++) {
if ((0x1 << i) & u3h->u3p_dis_msk) {
u3_ports_disabed++;
continue;
}
value = mtu3_readl(ibase, SSUSB_U3_CTRL(i));
value &= ~(SSUSB_U3_PORT_PDN | SSUSB_U3_PORT_DIS);
value |= SSUSB_U3_PORT_HOST_SEL;
mtu3_writel(ibase, SSUSB_U3_CTRL(i), value);
}
/* power on and enable all u2 ports */
for (i = 0; i < num_u2p; i++) {
value = mtu3_readl(ibase, SSUSB_U2_CTRL(i));
value &= ~(SSUSB_U2_PORT_PDN | SSUSB_U2_PORT_DIS);
value |= SSUSB_U2_PORT_HOST_SEL;
mtu3_writel(ibase, SSUSB_U2_CTRL(i), value);
}
check_clk = SSUSB_XHCI_RST_B_STS;
if (num_u3p > u3_ports_disabed)
check_clk = SSUSB_U3_MAC_RST_B_STS;
return ssusb_check_clocks(u3h->ssusb, check_clk);
}
static void ssusb_host_disable(struct mtu3_host *u3h)
{
void __iomem *ibase = u3h->ippc_base;
int num_u3p = u3h->u3_ports;
int num_u2p = u3h->u2_ports;
u32 value;
int i;
/* power down and disable u3 ports except skipped ones */
for (i = 0; i < num_u3p; i++) {
if ((0x1 << i) & u3h->u3p_dis_msk)
continue;
value = mtu3_readl(ibase, SSUSB_U3_CTRL(i));
value |= SSUSB_U3_PORT_PDN | SSUSB_U3_PORT_DIS;
mtu3_writel(ibase, SSUSB_U3_CTRL(i), value);
}
/* power down and disable all u2 ports */
for (i = 0; i < num_u2p; i++) {
value = mtu3_readl(ibase, SSUSB_U2_CTRL(i));
value |= SSUSB_U2_PORT_PDN | SSUSB_U2_PORT_DIS;
mtu3_writel(ibase, SSUSB_U2_CTRL(i), value);
}
/* power down host ip */
mtu3_setbits(ibase, U3D_SSUSB_IP_PW_CTRL1, SSUSB_IP_HOST_PDN);
}
/*
* If host supports multiple ports, the VBUSes(5V) of ports except port0
* which supports OTG are better to be enabled by default in DTS.
* Because the host driver will keep link with devices attached when system
* enters suspend mode, so no need to control VBUSes after initialization.
*/
int ssusb_host_init(struct ssusb_mtk *ssusb)
{
struct mtu3_host *u3h = ssusb->u3h;
struct udevice *dev = u3h->dev;
int ret;
u3h->ssusb = ssusb;
u3h->hcd = ssusb->mac_base;
u3h->ippc_base = ssusb->ippc_base;
/* optional property, ignore the error */
dev_read_u32(dev, "mediatek,u3p-dis-msk", &u3h->u3p_dis_msk);
host_ports_num_get(u3h);
ret = ssusb_host_enable(u3h);
if (ret)
return ret;
ssusb_set_force_mode(ssusb, MTU3_DR_FORCE_HOST);
ret = regulator_set_enable(ssusb->vbus_supply, true);
if (ret < 0 && ret != -ENOSYS) {
dev_err(dev, "failed to enable vbus %d!\n", ret);
return ret;
}
dev_info(dev, "%s done...\n", __func__);
return 0;
}
void ssusb_host_exit(struct ssusb_mtk *ssusb)
{
regulator_set_enable(ssusb->vbus_supply, false);
ssusb_host_disable(ssusb->u3h);
}