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248 lines
6.1 KiB
248 lines
6.1 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* mtu3_dr.c - dual role switch and host glue layer |
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* |
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* Copyright (C) 2016 MediaTek Inc. |
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* |
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* Author: Chunfeng Yun <[email protected]> |
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*/ |
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#include <linux/clk.h> |
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#include <linux/iopoll.h> |
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#include <linux/irq.h> |
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#include <linux/kernel.h> |
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#include <linux/mfd/syscon.h> |
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#include <linux/of_device.h> |
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#include <linux/regmap.h> |
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#include "mtu3.h" |
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#include "mtu3_dr.h" |
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/* mt8173 etc */ |
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#define PERI_WK_CTRL1 0x4 |
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#define WC1_IS_C(x) (((x) & 0xf) << 26) /* cycle debounce */ |
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#define WC1_IS_EN BIT(25) |
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#define WC1_IS_P BIT(6) /* polarity for ip sleep */ |
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/* mt2712 etc */ |
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#define PERI_SSUSB_SPM_CTRL 0x0 |
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#define SSC_IP_SLEEP_EN BIT(4) |
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#define SSC_SPM_INT_EN BIT(1) |
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enum ssusb_uwk_vers { |
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SSUSB_UWK_V1 = 1, |
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SSUSB_UWK_V2, |
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}; |
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/* |
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* ip-sleep wakeup mode: |
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* all clocks can be turn off, but power domain should be kept on |
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*/ |
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static void ssusb_wakeup_ip_sleep_set(struct ssusb_mtk *ssusb, bool enable) |
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{ |
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u32 reg, msk, val; |
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switch (ssusb->uwk_vers) { |
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case SSUSB_UWK_V1: |
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reg = ssusb->uwk_reg_base + PERI_WK_CTRL1; |
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msk = WC1_IS_EN | WC1_IS_C(0xf) | WC1_IS_P; |
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val = enable ? (WC1_IS_EN | WC1_IS_C(0x8)) : 0; |
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break; |
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case SSUSB_UWK_V2: |
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reg = ssusb->uwk_reg_base + PERI_SSUSB_SPM_CTRL; |
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msk = SSC_IP_SLEEP_EN | SSC_SPM_INT_EN; |
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val = enable ? msk : 0; |
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break; |
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default: |
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return; |
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} |
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regmap_update_bits(ssusb->uwk, reg, msk, val); |
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} |
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int ssusb_wakeup_of_property_parse(struct ssusb_mtk *ssusb, |
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struct device_node *dn) |
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{ |
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struct of_phandle_args args; |
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int ret; |
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/* wakeup function is optional */ |
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ssusb->uwk_en = of_property_read_bool(dn, "wakeup-source"); |
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if (!ssusb->uwk_en) |
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return 0; |
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ret = of_parse_phandle_with_fixed_args(dn, |
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"mediatek,syscon-wakeup", 2, 0, &args); |
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if (ret) |
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return ret; |
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ssusb->uwk_reg_base = args.args[0]; |
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ssusb->uwk_vers = args.args[1]; |
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ssusb->uwk = syscon_node_to_regmap(args.np); |
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of_node_put(args.np); |
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dev_info(ssusb->dev, "uwk - reg:0x%x, version:%d\n", |
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ssusb->uwk_reg_base, ssusb->uwk_vers); |
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return PTR_ERR_OR_ZERO(ssusb->uwk); |
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} |
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void ssusb_wakeup_set(struct ssusb_mtk *ssusb, bool enable) |
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{ |
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if (ssusb->uwk_en) |
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ssusb_wakeup_ip_sleep_set(ssusb, enable); |
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} |
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static void host_ports_num_get(struct ssusb_mtk *ssusb) |
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{ |
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u32 xhci_cap; |
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xhci_cap = mtu3_readl(ssusb->ippc_base, U3D_SSUSB_IP_XHCI_CAP); |
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ssusb->u2_ports = SSUSB_IP_XHCI_U2_PORT_NUM(xhci_cap); |
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ssusb->u3_ports = SSUSB_IP_XHCI_U3_PORT_NUM(xhci_cap); |
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dev_dbg(ssusb->dev, "host - u2_ports:%d, u3_ports:%d\n", |
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ssusb->u2_ports, ssusb->u3_ports); |
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} |
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/* only configure ports will be used later */ |
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int ssusb_host_enable(struct ssusb_mtk *ssusb) |
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{ |
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void __iomem *ibase = ssusb->ippc_base; |
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int num_u3p = ssusb->u3_ports; |
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int num_u2p = ssusb->u2_ports; |
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int u3_ports_disabed; |
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u32 check_clk; |
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u32 value; |
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int i; |
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/* power on host ip */ |
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mtu3_clrbits(ibase, U3D_SSUSB_IP_PW_CTRL1, SSUSB_IP_HOST_PDN); |
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/* power on and enable u3 ports except skipped ones */ |
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u3_ports_disabed = 0; |
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for (i = 0; i < num_u3p; i++) { |
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if ((0x1 << i) & ssusb->u3p_dis_msk) { |
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u3_ports_disabed++; |
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continue; |
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} |
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value = mtu3_readl(ibase, SSUSB_U3_CTRL(i)); |
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value &= ~(SSUSB_U3_PORT_PDN | SSUSB_U3_PORT_DIS); |
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value |= SSUSB_U3_PORT_HOST_SEL; |
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mtu3_writel(ibase, SSUSB_U3_CTRL(i), value); |
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} |
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/* power on and enable all u2 ports */ |
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for (i = 0; i < num_u2p; i++) { |
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value = mtu3_readl(ibase, SSUSB_U2_CTRL(i)); |
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value &= ~(SSUSB_U2_PORT_PDN | SSUSB_U2_PORT_DIS); |
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value |= SSUSB_U2_PORT_HOST_SEL; |
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mtu3_writel(ibase, SSUSB_U2_CTRL(i), value); |
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} |
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check_clk = SSUSB_XHCI_RST_B_STS; |
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if (num_u3p > u3_ports_disabed) |
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check_clk = SSUSB_U3_MAC_RST_B_STS; |
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return ssusb_check_clocks(ssusb, check_clk); |
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} |
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int ssusb_host_disable(struct ssusb_mtk *ssusb, bool suspend) |
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{ |
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void __iomem *ibase = ssusb->ippc_base; |
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int num_u3p = ssusb->u3_ports; |
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int num_u2p = ssusb->u2_ports; |
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u32 value; |
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int ret; |
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int i; |
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/* power down and disable u3 ports except skipped ones */ |
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for (i = 0; i < num_u3p; i++) { |
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if ((0x1 << i) & ssusb->u3p_dis_msk) |
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continue; |
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value = mtu3_readl(ibase, SSUSB_U3_CTRL(i)); |
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value |= SSUSB_U3_PORT_PDN; |
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value |= suspend ? 0 : SSUSB_U3_PORT_DIS; |
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mtu3_writel(ibase, SSUSB_U3_CTRL(i), value); |
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} |
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/* power down and disable all u2 ports */ |
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for (i = 0; i < num_u2p; i++) { |
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value = mtu3_readl(ibase, SSUSB_U2_CTRL(i)); |
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value |= SSUSB_U2_PORT_PDN; |
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value |= suspend ? 0 : SSUSB_U2_PORT_DIS; |
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mtu3_writel(ibase, SSUSB_U2_CTRL(i), value); |
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} |
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/* power down host ip */ |
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mtu3_setbits(ibase, U3D_SSUSB_IP_PW_CTRL1, SSUSB_IP_HOST_PDN); |
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if (!suspend) |
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return 0; |
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/* wait for host ip to sleep */ |
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ret = readl_poll_timeout(ibase + U3D_SSUSB_IP_PW_STS1, value, |
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(value & SSUSB_IP_SLEEP_STS), 100, 100000); |
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if (ret) |
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dev_err(ssusb->dev, "ip sleep failed!!!\n"); |
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return ret; |
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} |
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static void ssusb_host_setup(struct ssusb_mtk *ssusb) |
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{ |
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struct otg_switch_mtk *otg_sx = &ssusb->otg_switch; |
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host_ports_num_get(ssusb); |
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/* |
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* power on host and power on/enable all ports |
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* if support OTG, gadget driver will switch port0 to device mode |
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*/ |
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ssusb_host_enable(ssusb); |
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if (otg_sx->manual_drd_enabled) |
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ssusb_set_force_mode(ssusb, MTU3_DR_FORCE_HOST); |
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/* if port0 supports dual-role, works as host mode by default */ |
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ssusb_set_vbus(&ssusb->otg_switch, 1); |
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} |
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static void ssusb_host_cleanup(struct ssusb_mtk *ssusb) |
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{ |
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if (ssusb->is_host) |
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ssusb_set_vbus(&ssusb->otg_switch, 0); |
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ssusb_host_disable(ssusb, false); |
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} |
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/* |
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* If host supports multiple ports, the VBUSes(5V) of ports except port0 |
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* which supports OTG are better to be enabled by default in DTS. |
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* Because the host driver will keep link with devices attached when system |
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* enters suspend mode, so no need to control VBUSes after initialization. |
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*/ |
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int ssusb_host_init(struct ssusb_mtk *ssusb, struct device_node *parent_dn) |
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{ |
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struct device *parent_dev = ssusb->dev; |
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int ret; |
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ssusb_host_setup(ssusb); |
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ret = of_platform_populate(parent_dn, NULL, NULL, parent_dev); |
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if (ret) { |
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dev_dbg(parent_dev, "failed to create child devices at %pOF\n", |
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parent_dn); |
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return ret; |
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} |
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dev_info(parent_dev, "xHCI platform device register success...\n"); |
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return 0; |
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} |
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void ssusb_host_exit(struct ssusb_mtk *ssusb) |
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{ |
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of_platform_depopulate(ssusb->dev); |
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ssusb_host_cleanup(ssusb); |
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}
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