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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 <chunfeng.yun@mediatek.com>
*/
#include <linux/clk.h>
#include <linux/iopoll.h>
#include <linux/irq.h>
#include <linux/kernel.h>
#include <linux/mfd/syscon.h>
#include <linux/of_device.h>
#include <linux/regmap.h>
#include "mtu3.h"
#include "mtu3_dr.h"
/* mt8173 etc */
#define PERI_WK_CTRL1 0x4
#define WC1_IS_C(x) (((x) & 0xf) << 26) /* cycle debounce */
#define WC1_IS_EN BIT(25)
#define WC1_IS_P BIT(6) /* polarity for ip sleep */
/* mt8183 */
#define PERI_WK_CTRL0 0x0
#define WC0_IS_C(x) ((u32)(((x) & 0xf) << 28)) /* cycle debounce */
#define WC0_IS_P BIT(12) /* polarity */
#define WC0_IS_EN BIT(6)
/* mt8192 */
#define WC0_SSUSB0_CDEN BIT(6)
#define WC0_IS_SPM_EN BIT(1)
/* mt2712 etc */
#define PERI_SSUSB_SPM_CTRL 0x0
#define SSC_IP_SLEEP_EN BIT(4)
#define SSC_SPM_INT_EN BIT(1)
enum ssusb_uwk_vers {
SSUSB_UWK_V1 = 1,
SSUSB_UWK_V2,
SSUSB_UWK_V1_1 = 101, /* specific revision 1.01 */
SSUSB_UWK_V1_2, /* specific revision 1.02 */
};
/*
* ip-sleep wakeup mode:
* all clocks can be turn off, but power domain should be kept on
*/
static void ssusb_wakeup_ip_sleep_set(struct ssusb_mtk *ssusb, bool enable)
{
u32 reg, msk, val;
switch (ssusb->uwk_vers) {
case SSUSB_UWK_V1:
reg = ssusb->uwk_reg_base + PERI_WK_CTRL1;
msk = WC1_IS_EN | WC1_IS_C(0xf) | WC1_IS_P;
val = enable ? (WC1_IS_EN | WC1_IS_C(0x8)) : 0;
break;
case SSUSB_UWK_V1_1:
reg = ssusb->uwk_reg_base + PERI_WK_CTRL0;
msk = WC0_IS_EN | WC0_IS_C(0xf) | WC0_IS_P;
val = enable ? (WC0_IS_EN | WC0_IS_C(0x8)) : 0;
break;
case SSUSB_UWK_V1_2:
reg = ssusb->uwk_reg_base + PERI_WK_CTRL0;
msk = WC0_SSUSB0_CDEN | WC0_IS_SPM_EN;
val = enable ? msk : 0;
break;
case SSUSB_UWK_V2:
reg = ssusb->uwk_reg_base + PERI_SSUSB_SPM_CTRL;
msk = SSC_IP_SLEEP_EN | SSC_SPM_INT_EN;
val = enable ? msk : 0;
break;
default:
return;
}
regmap_update_bits(ssusb->uwk, reg, msk, val);
}
int ssusb_wakeup_of_property_parse(struct ssusb_mtk *ssusb,
struct device_node *dn)
{
struct of_phandle_args args;
int ret;
/* wakeup function is optional */
ssusb->uwk_en = of_property_read_bool(dn, "wakeup-source");
if (!ssusb->uwk_en)
return 0;
ret = of_parse_phandle_with_fixed_args(dn,
"mediatek,syscon-wakeup", 2, 0, &args);
if (ret)
return ret;
ssusb->uwk_reg_base = args.args[0];
ssusb->uwk_vers = args.args[1];
ssusb->uwk = syscon_node_to_regmap(args.np);
of_node_put(args.np);
dev_info(ssusb->dev, "uwk - reg:0x%x, version:%d\n",
ssusb->uwk_reg_base, ssusb->uwk_vers);
return PTR_ERR_OR_ZERO(ssusb->uwk);
}
void ssusb_wakeup_set(struct ssusb_mtk *ssusb, bool enable)
{
if (ssusb->uwk_en)
ssusb_wakeup_ip_sleep_set(ssusb, enable);
}
static void host_ports_num_get(struct ssusb_mtk *ssusb)
{
u32 xhci_cap;
xhci_cap = mtu3_readl(ssusb->ippc_base, U3D_SSUSB_IP_XHCI_CAP);
ssusb->u2_ports = SSUSB_IP_XHCI_U2_PORT_NUM(xhci_cap);
ssusb->u3_ports = SSUSB_IP_XHCI_U3_PORT_NUM(xhci_cap);
dev_dbg(ssusb->dev, "host - u2_ports:%d, u3_ports:%d\n",
ssusb->u2_ports, ssusb->u3_ports);
}
/* only configure ports will be used later */
static int ssusb_host_enable(struct ssusb_mtk *ssusb)
{
void __iomem *ibase = ssusb->ippc_base;
int num_u3p = ssusb->u3_ports;
int num_u2p = ssusb->u2_ports;
int u3_ports_disabled;
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_disabled = 0;
for (i = 0; i < num_u3p; i++) {
if ((0x1 << i) & ssusb->u3p_dis_msk) {
u3_ports_disabled++;
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++) {
if ((0x1 << i) & ssusb->u2p_dis_msk)
continue;
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_disabled)
check_clk = SSUSB_U3_MAC_RST_B_STS;
return ssusb_check_clocks(ssusb, check_clk);
}
static int ssusb_host_disable(struct ssusb_mtk *ssusb)
{
void __iomem *ibase = ssusb->ippc_base;
int num_u3p = ssusb->u3_ports;
int num_u2p = ssusb->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) & ssusb->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 u2 ports except skipped ones */
for (i = 0; i < num_u2p; i++) {
if ((0x1 << i) & ssusb->u2p_dis_msk)
continue;
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);
return 0;
}
int ssusb_host_resume(struct ssusb_mtk *ssusb, bool p0_skipped)
{
void __iomem *ibase = ssusb->ippc_base;
int u3p_skip_msk = ssusb->u3p_dis_msk;
int u2p_skip_msk = ssusb->u2p_dis_msk;
int num_u3p = ssusb->u3_ports;
int num_u2p = ssusb->u2_ports;
u32 value;
int i;
if (p0_skipped) {
u2p_skip_msk |= 0x1;
if (ssusb->otg_switch.is_u3_drd)
u3p_skip_msk |= 0x1;
}
/* power on host ip */
mtu3_clrbits(ibase, U3D_SSUSB_IP_PW_CTRL1, SSUSB_IP_HOST_PDN);
/* power on u3 ports except skipped ones */
for (i = 0; i < num_u3p; i++) {
if ((0x1 << i) & u3p_skip_msk)
continue;
value = mtu3_readl(ibase, SSUSB_U3_CTRL(i));
value &= ~SSUSB_U3_PORT_PDN;
mtu3_writel(ibase, SSUSB_U3_CTRL(i), value);
}
/* power on all u2 ports except skipped ones */
for (i = 0; i < num_u2p; i++) {
if ((0x1 << i) & u2p_skip_msk)
continue;
value = mtu3_readl(ibase, SSUSB_U2_CTRL(i));
value &= ~SSUSB_U2_PORT_PDN;
mtu3_writel(ibase, SSUSB_U2_CTRL(i), value);
}
return 0;
}
/* here not skip port0 due to PDN can be set repeatedly */
int ssusb_host_suspend(struct ssusb_mtk *ssusb)
{
void __iomem *ibase = ssusb->ippc_base;
int num_u3p = ssusb->u3_ports;
int num_u2p = ssusb->u2_ports;
u32 value;
int ret;
int i;
/* power down u3 ports except skipped ones */
for (i = 0; i < num_u3p; i++) {
if ((0x1 << i) & ssusb->u3p_dis_msk)
continue;
value = mtu3_readl(ibase, SSUSB_U3_CTRL(i));
value |= SSUSB_U3_PORT_PDN;
mtu3_writel(ibase, SSUSB_U3_CTRL(i), value);
}
/* power down u2 ports except skipped ones */
for (i = 0; i < num_u2p; i++) {
if ((0x1 << i) & ssusb->u2p_dis_msk)
continue;
value = mtu3_readl(ibase, SSUSB_U2_CTRL(i));
value |= SSUSB_U2_PORT_PDN;
mtu3_writel(ibase, SSUSB_U2_CTRL(i), value);
}
/* power down host ip */
mtu3_setbits(ibase, U3D_SSUSB_IP_PW_CTRL1, SSUSB_IP_HOST_PDN);
/* wait for host ip to sleep */
ret = readl_poll_timeout(ibase + U3D_SSUSB_IP_PW_STS1, value,
(value & SSUSB_IP_SLEEP_STS), 100, 100000);
if (ret)
dev_err(ssusb->dev, "ip sleep failed!!!\n");
return ret;
}
static void ssusb_host_setup(struct ssusb_mtk *ssusb)
{
host_ports_num_get(ssusb);
/*
* power on host and power on/enable all ports
* if support OTG, gadget driver will switch port0 to device mode
*/
ssusb_host_enable(ssusb);
ssusb_set_force_mode(ssusb, MTU3_DR_FORCE_HOST);
/* if port0 supports dual-role, works as host mode by default */
ssusb_set_vbus(&ssusb->otg_switch, 1);
}
static void ssusb_host_cleanup(struct ssusb_mtk *ssusb)
{
if (ssusb->is_host)
ssusb_set_vbus(&ssusb->otg_switch, 0);
ssusb_host_disable(ssusb);
}
/*
* 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 device_node *parent_dn)
{
struct device *parent_dev = ssusb->dev;
int ret;
ssusb_host_setup(ssusb);
ret = of_platform_populate(parent_dn, NULL, NULL, parent_dev);
if (ret) {
dev_dbg(parent_dev, "failed to create child devices at %pOF\n",
parent_dn);
return ret;
}
dev_info(parent_dev, "xHCI platform device register success...\n");
return 0;
}
void ssusb_host_exit(struct ssusb_mtk *ssusb)
{
of_platform_depopulate(ssusb->dev);
ssusb_host_cleanup(ssusb);
}
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