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linux/drivers/usb/mtu3/mtu3_plat.c
Chunfeng Yun 1567d661b9 usb: mtu3: get optional clock by devm_clk_get_optional() 
Use devm_clk_get_optional() to get optional clock instead of
optional_clk_get() which uses devm_clk_get() to get clock and
checks for -EPROBE_DEFER but not -ENOENT as devm_clk_get_optional()
does, in fact, only ignoring -ENOENT will cover more errors, so
the replacement doesn't change original purpose.

Signed-off-by: Chunfeng Yun <chunfeng.yun@mediatek.com>
Reviewed-by: Matthias Brugger <matthias.bgg@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-04-19 14:24:26 +02:00

532 lines
11 KiB
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// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (C) 2016 MediaTek Inc.
*
* Author: Chunfeng Yun <chunfeng.yun@mediatek.com>
*/
#include <linux/clk.h>
#include <linux/dma-mapping.h>
#include <linux/iopoll.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/of_address.h>
#include <linux/of_irq.h>
#include <linux/platform_device.h>
#include "mtu3.h"
#include "mtu3_dr.h"
#include "mtu3_debug.h"
/* u2-port0 should be powered on and enabled; */
int ssusb_check_clocks(struct ssusb_mtk *ssusb, u32 ex_clks)
{
void __iomem *ibase = ssusb->ippc_base;
u32 value, check_val;
int ret;
check_val = ex_clks | SSUSB_SYS125_RST_B_STS | SSUSB_SYSPLL_STABLE |
SSUSB_REF_RST_B_STS;
ret = readl_poll_timeout(ibase + U3D_SSUSB_IP_PW_STS1, value,
(check_val == (value & check_val)), 100, 20000);
if (ret) {
dev_err(ssusb->dev, "clks of sts1 are not stable!\n");
return ret;
}
ret = readl_poll_timeout(ibase + U3D_SSUSB_IP_PW_STS2, value,
(value & SSUSB_U2_MAC_SYS_RST_B_STS), 100, 10000);
if (ret) {
dev_err(ssusb->dev, "mac2 clock is not stable\n");
return ret;
}
return 0;
}
static int ssusb_phy_init(struct ssusb_mtk *ssusb)
{
int i;
int ret;
for (i = 0; i < ssusb->num_phys; i++) {
ret = phy_init(ssusb->phys[i]);
if (ret)
goto exit_phy;
}
return 0;
exit_phy:
for (; i > 0; i--)
phy_exit(ssusb->phys[i - 1]);
return ret;
}
static int ssusb_phy_exit(struct ssusb_mtk *ssusb)
{
int i;
for (i = 0; i < ssusb->num_phys; i++)
phy_exit(ssusb->phys[i]);
return 0;
}
static int ssusb_phy_power_on(struct ssusb_mtk *ssusb)
{
int i;
int ret;
for (i = 0; i < ssusb->num_phys; i++) {
ret = phy_power_on(ssusb->phys[i]);
if (ret)
goto power_off_phy;
}
return 0;
power_off_phy:
for (; i > 0; i--)
phy_power_off(ssusb->phys[i - 1]);
return ret;
}
static void ssusb_phy_power_off(struct ssusb_mtk *ssusb)
{
unsigned int i;
for (i = 0; i < ssusb->num_phys; i++)
phy_power_off(ssusb->phys[i]);
}
static int ssusb_clks_enable(struct ssusb_mtk *ssusb)
{
int ret;
ret = clk_prepare_enable(ssusb->sys_clk);
if (ret) {
dev_err(ssusb->dev, "failed to enable sys_clk\n");
goto sys_clk_err;
}
ret = clk_prepare_enable(ssusb->ref_clk);
if (ret) {
dev_err(ssusb->dev, "failed to enable ref_clk\n");
goto ref_clk_err;
}
ret = clk_prepare_enable(ssusb->mcu_clk);
if (ret) {
dev_err(ssusb->dev, "failed to enable mcu_clk\n");
goto mcu_clk_err;
}
ret = clk_prepare_enable(ssusb->dma_clk);
if (ret) {
dev_err(ssusb->dev, "failed to enable dma_clk\n");
goto dma_clk_err;
}
return 0;
dma_clk_err:
clk_disable_unprepare(ssusb->mcu_clk);
mcu_clk_err:
clk_disable_unprepare(ssusb->ref_clk);
ref_clk_err:
clk_disable_unprepare(ssusb->sys_clk);
sys_clk_err:
return ret;
}
static void ssusb_clks_disable(struct ssusb_mtk *ssusb)
{
clk_disable_unprepare(ssusb->dma_clk);
clk_disable_unprepare(ssusb->mcu_clk);
clk_disable_unprepare(ssusb->ref_clk);
clk_disable_unprepare(ssusb->sys_clk);
}
static int ssusb_rscs_init(struct ssusb_mtk *ssusb)
{
int ret = 0;
ret = regulator_enable(ssusb->vusb33);
if (ret) {
dev_err(ssusb->dev, "failed to enable vusb33\n");
goto vusb33_err;
}
ret = ssusb_clks_enable(ssusb);
if (ret)
goto clks_err;
ret = ssusb_phy_init(ssusb);
if (ret) {
dev_err(ssusb->dev, "failed to init phy\n");
goto phy_init_err;
}
ret = ssusb_phy_power_on(ssusb);
if (ret) {
dev_err(ssusb->dev, "failed to power on phy\n");
goto phy_err;
}
return 0;
phy_err:
ssusb_phy_exit(ssusb);
phy_init_err:
ssusb_clks_disable(ssusb);
clks_err:
regulator_disable(ssusb->vusb33);
vusb33_err:
return ret;
}
static void ssusb_rscs_exit(struct ssusb_mtk *ssusb)
{
ssusb_clks_disable(ssusb);
regulator_disable(ssusb->vusb33);
ssusb_phy_power_off(ssusb);
ssusb_phy_exit(ssusb);
}
static void ssusb_ip_sw_reset(struct ssusb_mtk *ssusb)
{
/* reset whole ip (xhci & u3d) */
mtu3_setbits(ssusb->ippc_base, U3D_SSUSB_IP_PW_CTRL0, SSUSB_IP_SW_RST);
udelay(1);
mtu3_clrbits(ssusb->ippc_base, U3D_SSUSB_IP_PW_CTRL0, SSUSB_IP_SW_RST);
/*
* device ip may be powered on in firmware/BROM stage before entering
* kernel stage;
* power down device ip, otherwise ip-sleep will fail when working as
* host only mode
*/
mtu3_setbits(ssusb->ippc_base, U3D_SSUSB_IP_PW_CTRL2, SSUSB_IP_DEV_PDN);
}
static int get_ssusb_rscs(struct platform_device *pdev, struct ssusb_mtk *ssusb)
{
struct device_node *node = pdev->dev.of_node;
struct otg_switch_mtk *otg_sx = &ssusb->otg_switch;
struct device *dev = &pdev->dev;
struct resource *res;
int i;
int ret;
ssusb->vusb33 = devm_regulator_get(dev, "vusb33");
if (IS_ERR(ssusb->vusb33)) {
dev_err(dev, "failed to get vusb33\n");
return PTR_ERR(ssusb->vusb33);
}
ssusb->sys_clk = devm_clk_get(dev, "sys_ck");
if (IS_ERR(ssusb->sys_clk)) {
dev_err(dev, "failed to get sys clock\n");
return PTR_ERR(ssusb->sys_clk);
}
ssusb->ref_clk = devm_clk_get_optional(dev, "ref_ck");
if (IS_ERR(ssusb->ref_clk))
return PTR_ERR(ssusb->ref_clk);
ssusb->mcu_clk = devm_clk_get_optional(dev, "mcu_ck");
if (IS_ERR(ssusb->mcu_clk))
return PTR_ERR(ssusb->mcu_clk);
ssusb->dma_clk = devm_clk_get_optional(dev, "dma_ck");
if (IS_ERR(ssusb->dma_clk))
return PTR_ERR(ssusb->dma_clk);
ssusb->num_phys = of_count_phandle_with_args(node,
"phys", "#phy-cells");
if (ssusb->num_phys > 0) {
ssusb->phys = devm_kcalloc(dev, ssusb->num_phys,
sizeof(*ssusb->phys), GFP_KERNEL);
if (!ssusb->phys)
return -ENOMEM;
} else {
ssusb->num_phys = 0;
}
for (i = 0; i < ssusb->num_phys; i++) {
ssusb->phys[i] = devm_of_phy_get_by_index(dev, node, i);
if (IS_ERR(ssusb->phys[i])) {
dev_err(dev, "failed to get phy-%d\n", i);
return PTR_ERR(ssusb->phys[i]);
}
}
res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "ippc");
ssusb->ippc_base = devm_ioremap_resource(dev, res);
if (IS_ERR(ssusb->ippc_base))
return PTR_ERR(ssusb->ippc_base);
ssusb->dr_mode = usb_get_dr_mode(dev);
if (ssusb->dr_mode == USB_DR_MODE_UNKNOWN)
ssusb->dr_mode = USB_DR_MODE_OTG;
if (ssusb->dr_mode == USB_DR_MODE_PERIPHERAL)
goto out;
/* if host role is supported */
ret = ssusb_wakeup_of_property_parse(ssusb, node);
if (ret) {
dev_err(dev, "failed to parse uwk property\n");
return ret;
}
/* optional property, ignore the error if it does not exist */
of_property_read_u32(node, "mediatek,u3p-dis-msk",
&ssusb->u3p_dis_msk);
otg_sx->vbus = devm_regulator_get(dev, "vbus");
if (IS_ERR(otg_sx->vbus)) {
dev_err(dev, "failed to get vbus\n");
return PTR_ERR(otg_sx->vbus);
}
if (ssusb->dr_mode == USB_DR_MODE_HOST)
goto out;
/* if dual-role mode is supported */
otg_sx->is_u3_drd = of_property_read_bool(node, "mediatek,usb3-drd");
otg_sx->manual_drd_enabled =
of_property_read_bool(node, "enable-manual-drd");
if (of_property_read_bool(node, "extcon")) {
otg_sx->edev = extcon_get_edev_by_phandle(ssusb->dev, 0);
if (IS_ERR(otg_sx->edev)) {
dev_err(ssusb->dev, "couldn't get extcon device\n");
return PTR_ERR(otg_sx->edev);
}
}
out:
dev_info(dev, "dr_mode: %d, is_u3_dr: %d, u3p_dis_msk: %x, drd: %s\n",
ssusb->dr_mode, otg_sx->is_u3_drd, ssusb->u3p_dis_msk,
otg_sx->manual_drd_enabled ? "manual" : "auto");
return 0;
}
static int mtu3_probe(struct platform_device *pdev)
{
struct device_node *node = pdev->dev.of_node;
struct device *dev = &pdev->dev;
struct ssusb_mtk *ssusb;
int ret = -ENOMEM;
/* all elements are set to ZERO as default value */
ssusb = devm_kzalloc(dev, sizeof(*ssusb), GFP_KERNEL);
if (!ssusb)
return -ENOMEM;
ret = dma_set_mask_and_coherent(dev, DMA_BIT_MASK(32));
if (ret) {
dev_err(dev, "No suitable DMA config available\n");
return -ENOTSUPP;
}
platform_set_drvdata(pdev, ssusb);
ssusb->dev = dev;
ret = get_ssusb_rscs(pdev, ssusb);
if (ret)
return ret;
ssusb_debugfs_create_root(ssusb);
/* enable power domain */
pm_runtime_enable(dev);
pm_runtime_get_sync(dev);
device_enable_async_suspend(dev);
ret = ssusb_rscs_init(ssusb);
if (ret)
goto comm_init_err;
ssusb_ip_sw_reset(ssusb);
if (IS_ENABLED(CONFIG_USB_MTU3_HOST))
ssusb->dr_mode = USB_DR_MODE_HOST;
else if (IS_ENABLED(CONFIG_USB_MTU3_GADGET))
ssusb->dr_mode = USB_DR_MODE_PERIPHERAL;
/* default as host */
ssusb->is_host = !(ssusb->dr_mode == USB_DR_MODE_PERIPHERAL);
switch (ssusb->dr_mode) {
case USB_DR_MODE_PERIPHERAL:
ret = ssusb_gadget_init(ssusb);
if (ret) {
dev_err(dev, "failed to initialize gadget\n");
goto comm_exit;
}
break;
case USB_DR_MODE_HOST:
ret = ssusb_host_init(ssusb, node);
if (ret) {
dev_err(dev, "failed to initialize host\n");
goto comm_exit;
}
break;
case USB_DR_MODE_OTG:
ret = ssusb_gadget_init(ssusb);
if (ret) {
dev_err(dev, "failed to initialize gadget\n");
goto comm_exit;
}
ret = ssusb_host_init(ssusb, node);
if (ret) {
dev_err(dev, "failed to initialize host\n");
goto gadget_exit;
}
ret = ssusb_otg_switch_init(ssusb);
if (ret) {
dev_err(dev, "failed to initialize switch\n");
goto host_exit;
}
break;
default:
dev_err(dev, "unsupported mode: %d\n", ssusb->dr_mode);
ret = -EINVAL;
goto comm_exit;
}
return 0;
host_exit:
ssusb_host_exit(ssusb);
gadget_exit:
ssusb_gadget_exit(ssusb);
comm_exit:
ssusb_rscs_exit(ssusb);
comm_init_err:
pm_runtime_put_sync(dev);
pm_runtime_disable(dev);
ssusb_debugfs_remove_root(ssusb);
return ret;
}
static int mtu3_remove(struct platform_device *pdev)
{
struct ssusb_mtk *ssusb = platform_get_drvdata(pdev);
switch (ssusb->dr_mode) {
case USB_DR_MODE_PERIPHERAL:
ssusb_gadget_exit(ssusb);
break;
case USB_DR_MODE_HOST:
ssusb_host_exit(ssusb);
break;
case USB_DR_MODE_OTG:
ssusb_otg_switch_exit(ssusb);
ssusb_gadget_exit(ssusb);
ssusb_host_exit(ssusb);
break;
default:
return -EINVAL;
}
ssusb_rscs_exit(ssusb);
pm_runtime_put_sync(&pdev->dev);
pm_runtime_disable(&pdev->dev);
ssusb_debugfs_remove_root(ssusb);
return 0;
}
/*
* when support dual-role mode, we reject suspend when
* it works as device mode;
*/
static int __maybe_unused mtu3_suspend(struct device *dev)
{
struct ssusb_mtk *ssusb = dev_get_drvdata(dev);
dev_dbg(dev, "%s\n", __func__);
/* REVISIT: disconnect it for only device mode? */
if (!ssusb->is_host)
return 0;
ssusb_host_disable(ssusb, true);
ssusb_phy_power_off(ssusb);
ssusb_clks_disable(ssusb);
ssusb_wakeup_set(ssusb, true);
return 0;
}
static int __maybe_unused mtu3_resume(struct device *dev)
{
struct ssusb_mtk *ssusb = dev_get_drvdata(dev);
int ret;
dev_dbg(dev, "%s\n", __func__);
if (!ssusb->is_host)
return 0;
ssusb_wakeup_set(ssusb, false);
ret = ssusb_clks_enable(ssusb);
if (ret)
goto clks_err;
ret = ssusb_phy_power_on(ssusb);
if (ret)
goto phy_err;
ssusb_host_enable(ssusb);
return 0;
phy_err:
ssusb_clks_disable(ssusb);
clks_err:
return ret;
}
static const struct dev_pm_ops mtu3_pm_ops = {
SET_SYSTEM_SLEEP_PM_OPS(mtu3_suspend, mtu3_resume)
};
#define DEV_PM_OPS (IS_ENABLED(CONFIG_PM) ? &mtu3_pm_ops : NULL)
#ifdef CONFIG_OF
static const struct of_device_id mtu3_of_match[] = {
{.compatible = "mediatek,mt8173-mtu3",},
{.compatible = "mediatek,mtu3",},
{},
};
MODULE_DEVICE_TABLE(of, mtu3_of_match);
#endif
static struct platform_driver mtu3_driver = {
.probe = mtu3_probe,
.remove = mtu3_remove,
.driver = {
.name = MTU3_DRIVER_NAME,
.pm = DEV_PM_OPS,
.of_match_table = of_match_ptr(mtu3_of_match),
},
};
module_platform_driver(mtu3_driver);
MODULE_AUTHOR("Chunfeng Yun <chunfeng.yun@mediatek.com>");
MODULE_LICENSE("GPL v2");
MODULE_DESCRIPTION("MediaTek USB3 DRD Controller Driver");
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