TWxSoftware/twx-linux
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

usb: fotg2: add Gemini-specific handling

Browse Source 
The Cortina Systems Gemini has bolted on a PHY inside the
silicon that can be handled by six bits in a MISC register in
the system controller.

If we are running on Gemini, look up a syscon regmap through
a phandle and enable VBUS and optionally the Mini-B connector.

If the device is flagged as "wakeup-source" using the standard
DT bindings, we also enable this in the global controller for
respective port.

Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Link: https://lore.kernel.org/r/20221109200554.1957185-1-linus.walleij@linaro.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Linus Walleij
2022-11-09 21:05:54 +01:00
committed by Greg Kroah-Hartman
parent d65e6b6e88
commit 00fb05ff87
2 changed files with 81 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files
drivers/usb/fotg210/Kconfig
+1
View File
@@ -5,6 +5,7 @@ config USB_FOTG210
depends on USB || USB_GADGET
depends on HAS_DMA && HAS_IOMEM
default ARCH_GEMINI
select MFD_SYSCON
help
Faraday FOTG210 is a dual-mode USB controller that can act
in both host controller and peripheral controller mode.
drivers/usb/fotg210/fotg210-core.c
+80
View File
@@ -5,15 +5,86 @@
* whether to proceed with probing the host or the peripheral
* driver.
*/
#include <linux/bitops.h>
#include <linux/device.h>
#include <linux/mfd/syscon.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/regmap.h>
#include <linux/usb.h>
#include <linux/usb/otg.h>
#include "fotg210.h"
/*
* Gemini-specific initialization function, only executed on the
* Gemini SoC using the global misc control register.
*
* The gemini USB blocks are connected to either Mini-A (host mode) or
* Mini-B (peripheral mode) plugs. There is no role switch support on the
* Gemini SoC, just either-or.
*/
#define GEMINI_GLOBAL_MISC_CTRL 0x30
#define GEMINI_MISC_USB0_WAKEUP BIT(14)
#define GEMINI_MISC_USB1_WAKEUP BIT(15)
#define GEMINI_MISC_USB0_VBUS_ON BIT(22)
#define GEMINI_MISC_USB1_VBUS_ON BIT(23)
#define GEMINI_MISC_USB0_MINI_B BIT(29)
#define GEMINI_MISC_USB1_MINI_B BIT(30)
static int fotg210_gemini_init(struct device *dev, struct resource *res,
enum usb_dr_mode mode)
{
struct device_node *np = dev->of_node;
struct regmap *map;
bool wakeup;
u32 mask, val;
int ret;
map = syscon_regmap_lookup_by_phandle(np, "syscon");
if (IS_ERR(map)) {
dev_err(dev, "no syscon\n");
return PTR_ERR(map);
}
wakeup = of_property_read_bool(np, "wakeup-source");
/*
* Figure out if this is USB0 or USB1 by simply checking the
* physical base address.
*/
mask = 0;
if (res->start == 0x69000000) {
mask = GEMINI_MISC_USB1_VBUS_ON | GEMINI_MISC_USB1_MINI_B |
GEMINI_MISC_USB1_WAKEUP;
if (mode == USB_DR_MODE_HOST)
val = GEMINI_MISC_USB1_VBUS_ON;
else
val = GEMINI_MISC_USB1_MINI_B;
if (wakeup)
val |= GEMINI_MISC_USB1_WAKEUP;
} else {
mask = GEMINI_MISC_USB0_VBUS_ON | GEMINI_MISC_USB0_MINI_B |
GEMINI_MISC_USB0_WAKEUP;
if (mode == USB_DR_MODE_HOST)
val = GEMINI_MISC_USB0_VBUS_ON;
else
val = GEMINI_MISC_USB0_MINI_B;
if (wakeup)
val |= GEMINI_MISC_USB0_WAKEUP;
}
ret = regmap_update_bits(map, GEMINI_GLOBAL_MISC_CTRL, mask, val);
if (ret) {
dev_err(dev, "failed to initialize Gemini PHY\n");
return ret;
}
dev_info(dev, "initialized Gemini PHY in %s mode\n",
(mode == USB_DR_MODE_HOST) ? "host" : "gadget");
return 0;
}
static int fotg210_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
@@ -22,6 +93,15 @@ static int fotg210_probe(struct platform_device *pdev)
mode = usb_get_dr_mode(dev);
if (of_device_is_compatible(dev->of_node, "cortina,gemini-usb")) {
struct resource *res;
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
ret = fotg210_gemini_init(dev, res, mode);
if (ret)
return ret;
}
if (mode == USB_DR_MODE_PERIPHERAL)
ret = fotg210_udc_probe(pdev);
else