527 lines
11 KiB
C
527 lines
11 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (C) 2016 MediaTek Inc.
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*
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* Author: Chunfeng Yun <chunfeng.yun@mediatek.com>
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*/
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#include <linux/clk.h>
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#include <linux/dma-mapping.h>
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#include <linux/iopoll.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/of_address.h>
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#include <linux/of_irq.h>
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#include <linux/platform_device.h>
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#include "mtu3.h"
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#include "mtu3_dr.h"
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/* u2-port0 should be powered on and enabled; */
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int ssusb_check_clocks(struct ssusb_mtk *ssusb, u32 ex_clks)
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{
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void __iomem *ibase = ssusb->ippc_base;
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u32 value, check_val;
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int ret;
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check_val = ex_clks | SSUSB_SYS125_RST_B_STS | SSUSB_SYSPLL_STABLE |
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SSUSB_REF_RST_B_STS;
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ret = readl_poll_timeout(ibase + U3D_SSUSB_IP_PW_STS1, value,
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(check_val == (value & check_val)), 100, 20000);
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if (ret) {
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dev_err(ssusb->dev, "clks of sts1 are not stable!\n");
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return ret;
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}
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ret = readl_poll_timeout(ibase + U3D_SSUSB_IP_PW_STS2, value,
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(value & SSUSB_U2_MAC_SYS_RST_B_STS), 100, 10000);
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if (ret) {
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dev_err(ssusb->dev, "mac2 clock is not stable\n");
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return ret;
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}
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return 0;
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}
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static int ssusb_phy_init(struct ssusb_mtk *ssusb)
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{
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int i;
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int ret;
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for (i = 0; i < ssusb->num_phys; i++) {
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ret = phy_init(ssusb->phys[i]);
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if (ret)
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goto exit_phy;
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}
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return 0;
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exit_phy:
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for (; i > 0; i--)
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phy_exit(ssusb->phys[i - 1]);
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return ret;
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}
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static int ssusb_phy_exit(struct ssusb_mtk *ssusb)
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{
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int i;
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for (i = 0; i < ssusb->num_phys; i++)
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phy_exit(ssusb->phys[i]);
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return 0;
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}
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static int ssusb_phy_power_on(struct ssusb_mtk *ssusb)
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{
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int i;
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int ret;
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for (i = 0; i < ssusb->num_phys; i++) {
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ret = phy_power_on(ssusb->phys[i]);
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if (ret)
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goto power_off_phy;
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}
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return 0;
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power_off_phy:
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for (; i > 0; i--)
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phy_power_off(ssusb->phys[i - 1]);
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return ret;
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}
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static void ssusb_phy_power_off(struct ssusb_mtk *ssusb)
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{
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unsigned int i;
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for (i = 0; i < ssusb->num_phys; i++)
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phy_power_off(ssusb->phys[i]);
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}
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static int ssusb_clks_enable(struct ssusb_mtk *ssusb)
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{
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int ret;
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ret = clk_prepare_enable(ssusb->sys_clk);
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if (ret) {
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dev_err(ssusb->dev, "failed to enable sys_clk\n");
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goto sys_clk_err;
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}
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ret = clk_prepare_enable(ssusb->ref_clk);
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if (ret) {
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dev_err(ssusb->dev, "failed to enable ref_clk\n");
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goto ref_clk_err;
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}
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ret = clk_prepare_enable(ssusb->mcu_clk);
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if (ret) {
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dev_err(ssusb->dev, "failed to enable mcu_clk\n");
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goto mcu_clk_err;
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}
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ret = clk_prepare_enable(ssusb->dma_clk);
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if (ret) {
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dev_err(ssusb->dev, "failed to enable dma_clk\n");
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goto dma_clk_err;
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}
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return 0;
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dma_clk_err:
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clk_disable_unprepare(ssusb->mcu_clk);
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mcu_clk_err:
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clk_disable_unprepare(ssusb->ref_clk);
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ref_clk_err:
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clk_disable_unprepare(ssusb->sys_clk);
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sys_clk_err:
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return ret;
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}
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static void ssusb_clks_disable(struct ssusb_mtk *ssusb)
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{
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clk_disable_unprepare(ssusb->dma_clk);
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clk_disable_unprepare(ssusb->mcu_clk);
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clk_disable_unprepare(ssusb->ref_clk);
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clk_disable_unprepare(ssusb->sys_clk);
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}
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static int ssusb_rscs_init(struct ssusb_mtk *ssusb)
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{
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int ret = 0;
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ret = regulator_enable(ssusb->vusb33);
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if (ret) {
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dev_err(ssusb->dev, "failed to enable vusb33\n");
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goto vusb33_err;
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}
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ret = ssusb_clks_enable(ssusb);
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if (ret)
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goto clks_err;
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ret = ssusb_phy_init(ssusb);
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if (ret) {
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dev_err(ssusb->dev, "failed to init phy\n");
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goto phy_init_err;
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}
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ret = ssusb_phy_power_on(ssusb);
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if (ret) {
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dev_err(ssusb->dev, "failed to power on phy\n");
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goto phy_err;
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}
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return 0;
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phy_err:
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ssusb_phy_exit(ssusb);
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phy_init_err:
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ssusb_clks_disable(ssusb);
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clks_err:
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regulator_disable(ssusb->vusb33);
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vusb33_err:
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return ret;
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}
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static void ssusb_rscs_exit(struct ssusb_mtk *ssusb)
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{
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ssusb_clks_disable(ssusb);
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regulator_disable(ssusb->vusb33);
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ssusb_phy_power_off(ssusb);
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ssusb_phy_exit(ssusb);
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}
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static void ssusb_ip_sw_reset(struct ssusb_mtk *ssusb)
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{
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/* reset whole ip (xhci & u3d) */
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mtu3_setbits(ssusb->ippc_base, U3D_SSUSB_IP_PW_CTRL0, SSUSB_IP_SW_RST);
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udelay(1);
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mtu3_clrbits(ssusb->ippc_base, U3D_SSUSB_IP_PW_CTRL0, SSUSB_IP_SW_RST);
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}
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/* ignore the error if the clock does not exist */
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static struct clk *get_optional_clk(struct device *dev, const char *id)
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{
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struct clk *opt_clk;
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opt_clk = devm_clk_get(dev, id);
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/* ignore error number except EPROBE_DEFER */
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if (IS_ERR(opt_clk) && (PTR_ERR(opt_clk) != -EPROBE_DEFER))
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opt_clk = NULL;
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return opt_clk;
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}
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static int get_ssusb_rscs(struct platform_device *pdev, struct ssusb_mtk *ssusb)
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{
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struct device_node *node = pdev->dev.of_node;
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struct otg_switch_mtk *otg_sx = &ssusb->otg_switch;
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struct device *dev = &pdev->dev;
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struct regulator *vbus;
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struct resource *res;
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int i;
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int ret;
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ssusb->vusb33 = devm_regulator_get(&pdev->dev, "vusb33");
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if (IS_ERR(ssusb->vusb33)) {
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dev_err(dev, "failed to get vusb33\n");
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return PTR_ERR(ssusb->vusb33);
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}
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ssusb->sys_clk = devm_clk_get(dev, "sys_ck");
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if (IS_ERR(ssusb->sys_clk)) {
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dev_err(dev, "failed to get sys clock\n");
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return PTR_ERR(ssusb->sys_clk);
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}
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ssusb->ref_clk = get_optional_clk(dev, "ref_ck");
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if (IS_ERR(ssusb->ref_clk))
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return PTR_ERR(ssusb->ref_clk);
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ssusb->mcu_clk = get_optional_clk(dev, "mcu_ck");
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if (IS_ERR(ssusb->mcu_clk))
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return PTR_ERR(ssusb->mcu_clk);
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ssusb->dma_clk = get_optional_clk(dev, "dma_ck");
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if (IS_ERR(ssusb->dma_clk))
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return PTR_ERR(ssusb->dma_clk);
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ssusb->num_phys = of_count_phandle_with_args(node,
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"phys", "#phy-cells");
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if (ssusb->num_phys > 0) {
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ssusb->phys = devm_kcalloc(dev, ssusb->num_phys,
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sizeof(*ssusb->phys), GFP_KERNEL);
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if (!ssusb->phys)
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return -ENOMEM;
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} else {
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ssusb->num_phys = 0;
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}
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for (i = 0; i < ssusb->num_phys; i++) {
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ssusb->phys[i] = devm_of_phy_get_by_index(dev, node, i);
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if (IS_ERR(ssusb->phys[i])) {
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dev_err(dev, "failed to get phy-%d\n", i);
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return PTR_ERR(ssusb->phys[i]);
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}
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}
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res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "ippc");
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ssusb->ippc_base = devm_ioremap_resource(dev, res);
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if (IS_ERR(ssusb->ippc_base))
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return PTR_ERR(ssusb->ippc_base);
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ssusb->dr_mode = usb_get_dr_mode(dev);
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if (ssusb->dr_mode == USB_DR_MODE_UNKNOWN)
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ssusb->dr_mode = USB_DR_MODE_OTG;
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if (ssusb->dr_mode == USB_DR_MODE_PERIPHERAL)
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return 0;
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/* if host role is supported */
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ret = ssusb_wakeup_of_property_parse(ssusb, node);
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if (ret) {
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dev_err(dev, "failed to parse uwk property\n");
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return ret;
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}
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/* optional property, ignore the error if it does not exist */
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of_property_read_u32(node, "mediatek,u3p-dis-msk",
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&ssusb->u3p_dis_msk);
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vbus = devm_regulator_get(&pdev->dev, "vbus");
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if (IS_ERR(vbus)) {
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dev_err(dev, "failed to get vbus\n");
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return PTR_ERR(vbus);
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}
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otg_sx->vbus = vbus;
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if (ssusb->dr_mode == USB_DR_MODE_HOST)
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return 0;
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/* if dual-role mode is supported */
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otg_sx->is_u3_drd = of_property_read_bool(node, "mediatek,usb3-drd");
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otg_sx->manual_drd_enabled =
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of_property_read_bool(node, "enable-manual-drd");
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if (of_property_read_bool(node, "extcon")) {
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otg_sx->edev = extcon_get_edev_by_phandle(ssusb->dev, 0);
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if (IS_ERR(otg_sx->edev)) {
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dev_err(ssusb->dev, "couldn't get extcon device\n");
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return PTR_ERR(otg_sx->edev);
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}
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}
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dev_info(dev, "dr_mode: %d, is_u3_dr: %d, u3p_dis_msk: %x, drd: %s\n",
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ssusb->dr_mode, otg_sx->is_u3_drd, ssusb->u3p_dis_msk,
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otg_sx->manual_drd_enabled ? "manual" : "auto");
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return 0;
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}
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static int mtu3_probe(struct platform_device *pdev)
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{
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struct device_node *node = pdev->dev.of_node;
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struct device *dev = &pdev->dev;
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struct ssusb_mtk *ssusb;
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int ret = -ENOMEM;
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/* all elements are set to ZERO as default value */
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ssusb = devm_kzalloc(dev, sizeof(*ssusb), GFP_KERNEL);
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if (!ssusb)
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return -ENOMEM;
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ret = dma_set_mask_and_coherent(dev, DMA_BIT_MASK(32));
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if (ret) {
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dev_err(dev, "No suitable DMA config available\n");
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return -ENOTSUPP;
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}
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platform_set_drvdata(pdev, ssusb);
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ssusb->dev = dev;
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ret = get_ssusb_rscs(pdev, ssusb);
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if (ret)
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return ret;
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/* enable power domain */
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pm_runtime_enable(dev);
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pm_runtime_get_sync(dev);
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device_enable_async_suspend(dev);
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ret = ssusb_rscs_init(ssusb);
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if (ret)
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goto comm_init_err;
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ssusb_ip_sw_reset(ssusb);
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if (IS_ENABLED(CONFIG_USB_MTU3_HOST))
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ssusb->dr_mode = USB_DR_MODE_HOST;
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else if (IS_ENABLED(CONFIG_USB_MTU3_GADGET))
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ssusb->dr_mode = USB_DR_MODE_PERIPHERAL;
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/* default as host */
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ssusb->is_host = !(ssusb->dr_mode == USB_DR_MODE_PERIPHERAL);
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switch (ssusb->dr_mode) {
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case USB_DR_MODE_PERIPHERAL:
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ret = ssusb_gadget_init(ssusb);
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if (ret) {
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dev_err(dev, "failed to initialize gadget\n");
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goto comm_exit;
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}
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break;
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case USB_DR_MODE_HOST:
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ret = ssusb_host_init(ssusb, node);
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if (ret) {
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dev_err(dev, "failed to initialize host\n");
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goto comm_exit;
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}
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break;
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case USB_DR_MODE_OTG:
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ret = ssusb_gadget_init(ssusb);
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if (ret) {
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dev_err(dev, "failed to initialize gadget\n");
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goto comm_exit;
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}
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ret = ssusb_host_init(ssusb, node);
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if (ret) {
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dev_err(dev, "failed to initialize host\n");
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goto gadget_exit;
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}
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ssusb_otg_switch_init(ssusb);
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break;
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default:
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dev_err(dev, "unsupported mode: %d\n", ssusb->dr_mode);
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ret = -EINVAL;
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goto comm_exit;
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}
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return 0;
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gadget_exit:
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ssusb_gadget_exit(ssusb);
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comm_exit:
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ssusb_rscs_exit(ssusb);
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comm_init_err:
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pm_runtime_put_sync(dev);
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pm_runtime_disable(dev);
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return ret;
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}
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static int mtu3_remove(struct platform_device *pdev)
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{
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struct ssusb_mtk *ssusb = platform_get_drvdata(pdev);
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switch (ssusb->dr_mode) {
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case USB_DR_MODE_PERIPHERAL:
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ssusb_gadget_exit(ssusb);
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break;
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case USB_DR_MODE_HOST:
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ssusb_host_exit(ssusb);
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break;
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case USB_DR_MODE_OTG:
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ssusb_otg_switch_exit(ssusb);
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ssusb_gadget_exit(ssusb);
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ssusb_host_exit(ssusb);
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break;
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default:
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return -EINVAL;
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}
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ssusb_rscs_exit(ssusb);
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pm_runtime_put_sync(&pdev->dev);
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pm_runtime_disable(&pdev->dev);
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return 0;
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}
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/*
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* when support dual-role mode, we reject suspend when
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* it works as device mode;
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*/
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static int __maybe_unused mtu3_suspend(struct device *dev)
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{
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struct ssusb_mtk *ssusb = dev_get_drvdata(dev);
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dev_dbg(dev, "%s\n", __func__);
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/* REVISIT: disconnect it for only device mode? */
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if (!ssusb->is_host)
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return 0;
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ssusb_host_disable(ssusb, true);
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ssusb_phy_power_off(ssusb);
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ssusb_clks_disable(ssusb);
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ssusb_wakeup_set(ssusb, true);
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return 0;
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}
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static int __maybe_unused mtu3_resume(struct device *dev)
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{
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struct ssusb_mtk *ssusb = dev_get_drvdata(dev);
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int ret;
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dev_dbg(dev, "%s\n", __func__);
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if (!ssusb->is_host)
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return 0;
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ssusb_wakeup_set(ssusb, false);
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ret = ssusb_clks_enable(ssusb);
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if (ret)
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goto clks_err;
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ret = ssusb_phy_power_on(ssusb);
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if (ret)
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goto phy_err;
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ssusb_host_enable(ssusb);
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return 0;
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phy_err:
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ssusb_clks_disable(ssusb);
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clks_err:
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return ret;
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}
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static const struct dev_pm_ops mtu3_pm_ops = {
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SET_SYSTEM_SLEEP_PM_OPS(mtu3_suspend, mtu3_resume)
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};
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#define DEV_PM_OPS (IS_ENABLED(CONFIG_PM) ? &mtu3_pm_ops : NULL)
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#ifdef CONFIG_OF
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static const struct of_device_id mtu3_of_match[] = {
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{.compatible = "mediatek,mt8173-mtu3",},
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{.compatible = "mediatek,mtu3",},
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{},
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};
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MODULE_DEVICE_TABLE(of, mtu3_of_match);
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#endif
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static struct platform_driver mtu3_driver = {
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.probe = mtu3_probe,
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.remove = mtu3_remove,
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.driver = {
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.name = MTU3_DRIVER_NAME,
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.pm = DEV_PM_OPS,
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.of_match_table = of_match_ptr(mtu3_of_match),
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},
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};
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module_platform_driver(mtu3_driver);
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MODULE_AUTHOR("Chunfeng Yun <chunfeng.yun@mediatek.com>");
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MODULE_LICENSE("GPL v2");
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MODULE_DESCRIPTION("MediaTek USB3 DRD Controller Driver");
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