diff options
Diffstat (limited to 'drivers/usb/mtu3/mtu3_host.c')
| -rw-r--r-- | drivers/usb/mtu3/mtu3_host.c | 248 |
1 files changed, 248 insertions, 0 deletions
diff --git a/drivers/usb/mtu3/mtu3_host.c b/drivers/usb/mtu3/mtu3_host.c new file mode 100644 index 000000000..c871b94f3 --- /dev/null +++ b/drivers/usb/mtu3/mtu3_host.c @@ -0,0 +1,248 @@ +// 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 */ + +/* 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, +}; + +/* + * 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_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 */ +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_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) & ssusb->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(ssusb, check_clk); +} + +int ssusb_host_disable(struct ssusb_mtk *ssusb, bool suspend) +{ + 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 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; + value |= suspend ? 0 : 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; + value |= suspend ? 0 : 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 (!suspend) + return 0; + + /* 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) +{ + struct otg_switch_mtk *otg_sx = &ssusb->otg_switch; + + 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); + + if (otg_sx->manual_drd_enabled) + 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, false); +} + +/* + * 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); +} |