usb: xhci-tegra: Add OTG support

Get usb-phy's for availbale USB 2 phys. Register id notifiers for available
usb-phy's to receive role change notifications. Perform PP for the received
role change usb ports.

Signed-off-by: Nagarjuna Kristam <nkristam@nvidia.com>
[treding@nvidia.com: rebase onto Greg's usb-next branch]
Signed-off-by: Thierry Reding <treding@nvidia.com>
This commit is contained in:
Nagarjuna Kristam 2020-02-10 13:41:34 +05:30 committed by Thierry Reding
parent 80525cc238
commit f836e78430
1 changed files with 227 additions and 1 deletions

View File

@ -24,6 +24,9 @@
#include <linux/regulator/consumer.h>
#include <linux/reset.h>
#include <linux/slab.h>
#include <linux/usb/otg.h>
#include <linux/usb/phy.h>
#include <linux/usb/role.h>
#include <soc/tegra/pmc.h>
#include "xhci.h"
@ -204,6 +207,7 @@ struct tegra_xusb_soc {
bool scale_ss_clock;
bool has_ipfs;
bool lpm_support;
bool otg_reset_sspi;
};
struct tegra_xusb_context {
@ -251,6 +255,14 @@ struct tegra_xusb {
struct phy **phys;
unsigned int num_phys;
struct usb_phy **usbphy;
unsigned int num_usb_phys;
int otg_usb2_port;
int otg_usb3_port;
bool host_mode;
struct notifier_block id_nb;
struct work_struct id_work;
/* Firmware loading related */
struct {
size_t size;
@ -1082,6 +1094,205 @@ static int tegra_xusb_enable_firmware_messages(struct tegra_xusb *tegra)
return err;
}
static void tegra_xhci_set_port_power(struct tegra_xusb *tegra, bool main,
bool set)
{
struct xhci_hcd *xhci = hcd_to_xhci(tegra->hcd);
struct usb_hcd *hcd = main ? xhci->main_hcd : xhci->shared_hcd;
unsigned int wait = (!main && !set) ? 1000 : 10;
u16 typeReq = set ? SetPortFeature : ClearPortFeature;
u16 wIndex = main ? tegra->otg_usb2_port + 1 : tegra->otg_usb3_port + 1;
u32 status;
u32 stat_power = main ? USB_PORT_STAT_POWER : USB_SS_PORT_STAT_POWER;
u32 status_val = set ? stat_power : 0;
dev_dbg(tegra->dev, "%s():%s %s port power\n", __func__,
set ? "set" : "clear", main ? "HS" : "SS");
hcd->driver->hub_control(hcd, typeReq, USB_PORT_FEAT_POWER, wIndex,
NULL, 0);
do {
tegra_xhci_hc_driver.hub_control(hcd, GetPortStatus, 0, wIndex,
(char *) &status, sizeof(status));
if (status_val == (status & stat_power))
break;
if (!main && !set)
usleep_range(600, 700);
else
usleep_range(10, 20);
} while (--wait > 0);
if (status_val != (status & stat_power))
dev_info(tegra->dev, "failed to %s %s PP %d\n",
set ? "set" : "clear",
main ? "HS" : "SS", status);
}
static struct phy *tegra_xusb_get_phy(struct tegra_xusb *tegra, char *name,
int port)
{
unsigned int i, phy_count = 0;
for (i = 0; i < tegra->soc->num_types; i++) {
if (!strncmp(tegra->soc->phy_types[i].name, "usb2",
strlen(name)))
return tegra->phys[phy_count+port];
phy_count += tegra->soc->phy_types[i].num;
}
return NULL;
}
static void tegra_xhci_id_work(struct work_struct *work)
{
struct tegra_xusb *tegra = container_of(work, struct tegra_xusb,
id_work);
struct xhci_hcd *xhci = hcd_to_xhci(tegra->hcd);
struct tegra_xusb_mbox_msg msg;
struct phy *phy = tegra_xusb_get_phy(tegra, "usb2",
tegra->otg_usb2_port);
u32 status;
int ret;
dev_dbg(tegra->dev, "host mode %s\n", tegra->host_mode ? "on" : "off");
mutex_lock(&tegra->lock);
if (tegra->host_mode)
phy_set_mode_ext(phy, PHY_MODE_USB_OTG, USB_ROLE_HOST);
else
phy_set_mode_ext(phy, PHY_MODE_USB_OTG, USB_ROLE_NONE);
mutex_unlock(&tegra->lock);
if (tegra->host_mode) {
/* switch to host mode */
if (tegra->otg_usb3_port >= 0) {
if (tegra->soc->otg_reset_sspi) {
/* set PP=0 */
tegra_xhci_hc_driver.hub_control(
xhci->shared_hcd, GetPortStatus,
0, tegra->otg_usb3_port+1,
(char *) &status, sizeof(status));
if (status & USB_SS_PORT_STAT_POWER)
tegra_xhci_set_port_power(tegra, false,
false);
/* reset OTG port SSPI */
msg.cmd = MBOX_CMD_RESET_SSPI;
msg.data = tegra->otg_usb3_port+1;
ret = tegra_xusb_mbox_send(tegra, &msg);
if (ret < 0) {
dev_info(tegra->dev,
"failed to RESET_SSPI %d\n",
ret);
}
}
tegra_xhci_set_port_power(tegra, false, true);
}
tegra_xhci_set_port_power(tegra, true, true);
} else {
if (tegra->otg_usb3_port >= 0)
tegra_xhci_set_port_power(tegra, false, false);
tegra_xhci_set_port_power(tegra, true, false);
}
}
static int tegra_xusb_get_usb2_port(struct tegra_xusb *tegra,
struct usb_phy *usbphy)
{
unsigned int i;
for (i = 0; i < tegra->num_usb_phys; i++) {
if (tegra->usbphy[i] && usbphy == tegra->usbphy[i])
return i;
}
return -1;
}
static int tegra_xhci_id_notify(struct notifier_block *nb,
unsigned long action, void *data)
{
struct tegra_xusb *tegra = container_of(nb, struct tegra_xusb,
id_nb);
struct usb_phy *usbphy = (struct usb_phy *)data;
dev_dbg(tegra->dev, "%s(): action is %d", __func__, usbphy->last_event);
if ((tegra->host_mode && usbphy->last_event == USB_EVENT_ID) ||
(!tegra->host_mode && usbphy->last_event != USB_EVENT_ID)) {
dev_dbg(tegra->dev, "Same role(%d) received. Ignore",
tegra->host_mode);
return NOTIFY_OK;
}
tegra->otg_usb2_port = tegra_xusb_get_usb2_port(tegra, usbphy);
tegra->otg_usb3_port = tegra_xusb_padctl_get_usb3_companion(
tegra->padctl,
tegra->otg_usb2_port);
tegra->host_mode = (usbphy->last_event == USB_EVENT_ID) ? true : false;
schedule_work(&tegra->id_work);
return NOTIFY_OK;
}
static int tegra_xusb_init_usb_phy(struct tegra_xusb *tegra)
{
unsigned int i;
tegra->usbphy = devm_kcalloc(tegra->dev, tegra->num_usb_phys,
sizeof(*tegra->usbphy), GFP_KERNEL);
if (!tegra->usbphy)
return -ENOMEM;
INIT_WORK(&tegra->id_work, tegra_xhci_id_work);
tegra->id_nb.notifier_call = tegra_xhci_id_notify;
for (i = 0; i < tegra->num_usb_phys; i++) {
struct phy *phy = tegra_xusb_get_phy(tegra, "usb2", i);
if (!phy)
continue;
tegra->usbphy[i] = devm_usb_get_phy_by_node(tegra->dev,
phy->dev.of_node,
&tegra->id_nb);
if (!IS_ERR(tegra->usbphy[i])) {
dev_dbg(tegra->dev, "usbphy-%d registered", i);
otg_set_host(tegra->usbphy[i]->otg, &tegra->hcd->self);
} else {
/*
* usb-phy is optional, continue if its not available.
*/
tegra->usbphy[i] = NULL;
}
}
return 0;
}
static void tegra_xusb_deinit_usb_phy(struct tegra_xusb *tegra)
{
unsigned int i;
cancel_work_sync(&tegra->id_work);
for (i = 0; i < tegra->num_usb_phys; i++)
if (tegra->usbphy[i])
otg_set_host(tegra->usbphy[i]->otg, NULL);
}
static int tegra_xusb_probe(struct platform_device *pdev)
{
struct tegra_xusb *tegra;
@ -1255,8 +1466,11 @@ static int tegra_xusb_probe(struct platform_device *pdev)
goto put_powerdomains;
}
for (i = 0; i < tegra->soc->num_types; i++)
for (i = 0; i < tegra->soc->num_types; i++) {
if (!strncmp(tegra->soc->phy_types[i].name, "usb2", 4))
tegra->num_usb_phys = tegra->soc->phy_types[i].num;
tegra->num_phys += tegra->soc->phy_types[i].num;
}
tegra->phys = devm_kcalloc(&pdev->dev, tegra->num_phys,
sizeof(*tegra->phys), GFP_KERNEL);
@ -1385,6 +1599,12 @@ static int tegra_xusb_probe(struct platform_device *pdev)
goto remove_usb3;
}
err = tegra_xusb_init_usb_phy(tegra);
if (err < 0) {
dev_err(&pdev->dev, "failed to init USB PHY: %d\n", err);
goto remove_usb3;
}
return 0;
remove_usb3:
@ -1421,6 +1641,8 @@ static int tegra_xusb_remove(struct platform_device *pdev)
struct tegra_xusb *tegra = platform_get_drvdata(pdev);
struct xhci_hcd *xhci = hcd_to_xhci(tegra->hcd);
tegra_xusb_deinit_usb_phy(tegra);
usb_remove_hcd(xhci->shared_hcd);
usb_put_hcd(xhci->shared_hcd);
xhci->shared_hcd = NULL;
@ -1695,6 +1917,7 @@ static const struct tegra_xusb_soc tegra124_soc = {
},
.scale_ss_clock = true,
.has_ipfs = true,
.otg_reset_sspi = false,
.mbox = {
.cmd = 0xe4,
.data_in = 0xe8,
@ -1734,6 +1957,7 @@ static const struct tegra_xusb_soc tegra210_soc = {
},
.scale_ss_clock = false,
.has_ipfs = true,
.otg_reset_sspi = true,
.mbox = {
.cmd = 0xe4,
.data_in = 0xe8,
@ -1774,6 +1998,7 @@ static const struct tegra_xusb_soc tegra186_soc = {
},
.scale_ss_clock = false,
.has_ipfs = false,
.otg_reset_sspi = false,
.mbox = {
.cmd = 0xe4,
.data_in = 0xe8,
@ -1804,6 +2029,7 @@ static const struct tegra_xusb_soc tegra194_soc = {
},
.scale_ss_clock = false,
.has_ipfs = false,
.otg_reset_sspi = false,
.mbox = {
.cmd = 0x68,
.data_in = 0x6c,