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Code Issues Releases Wiki Activity

ARM/musb: omap2: Remove global GPIO numbers from TUSB6010

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The TUSB6010 (MUSB) device is picking up some GPIO lines
hardcoded by number and passing on to the TUSB6010 device
when registering it.

Instead of nasty workarounds, provide a GPIO descriptor
table and then make the TUSB6010 MUSB glue driver pick up
the GPIO lines directly, convert it to an IRQ and pass down
to the MUSB driver. OMAP2 is the only system using the
TUSB6010.

Stash the GPIO descriptors in the glue layer and use
then to power up and down the TUSB6010 on-demand, instead
of using boardfile callbacks.

Since the OMAP2 boards are the only boards using the
.set_power() and .board_set_power() callbacks, we can
just delete them as the power is now handled directly
in the TUSB6010 glue code.

Cc: Bin Liu <b-liu@ti.com>
Cc: linux-usb@vger.kernel.org
Fixes: 92bf78b33b ("gpio: omap: use dynamic allocation of base")
Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
This commit is contained in:
Linus Walleij 2023-04-30 21:38:24 +02:00
parent 078dc5194c
commit 8e0285ab95
7 changed files with 73 additions and 99 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

71
arch/arm/mach-omap2/board-n8x0.c
View file

@ -10,8 +10,8 @@
#include <linux/clk.h>
#include <linux/delay.h>
#include <linux/gpio.h>
#include <linux/gpio/machine.h>
#include <linux/gpio/consumer.h>
#include <linux/init.h>
#include <linux/io.h>
#include <linux/irq.h>
@ -29,13 +29,12 @@
#include "common.h"
#include "mmc.h"
#include "usb-tusb6010.h"
#include "soc.h"
#include "common-board-devices.h"
#define TUSB6010_ASYNC_CS 1
#define TUSB6010_SYNC_CS 4
#define TUSB6010_GPIO_INT 58
#define TUSB6010_GPIO_ENABLE 0
#define TUSB6010_DMACHAN 0x3f
#define NOKIA_N810_WIMAX (1 << 2)
@ -62,37 +61,6 @@ static void board_check_revision(void)
}
#if IS_ENABLED(CONFIG_USB_MUSB_TUSB6010)
/*
* Enable or disable power to TUSB6010. When enabling, turn on 3.3 V and
* 1.5 V voltage regulators of PM companion chip. Companion chip will then
* provide then PGOOD signal to TUSB6010 which will release it from reset.
*/
static int tusb_set_power(int state)
{
int i, retval = 0;
if (state) {
gpio_set_value(TUSB6010_GPIO_ENABLE, 1);
msleep(1);
/* Wait until TUSB6010 pulls INT pin down */
i = 100;
while (i && gpio_get_value(TUSB6010_GPIO_INT)) {
msleep(1);
i--;
}
if (!i) {
printk(KERN_ERR "tusb: powerup failed\n");
retval = -ENODEV;
}
} else {
gpio_set_value(TUSB6010_GPIO_ENABLE, 0);
msleep(10);
}
return retval;
}
static struct musb_hdrc_config musb_config = {
.multipoint = 1,
@ -103,39 +71,36 @@ static struct musb_hdrc_config musb_config = {
static struct musb_hdrc_platform_data tusb_data = {
.mode = MUSB_OTG,
.set_power = tusb_set_power,
.min_power = 25, /* x2 = 50 mA drawn from VBUS as peripheral */
.power = 100, /* Max 100 mA VBUS for host mode */
.config = &musb_config,
};
static struct gpiod_lookup_table tusb_gpio_table = {
.dev_id = "musb-tusb",
.table = {
GPIO_LOOKUP("gpio-0-15", 0, "enable",
GPIO_ACTIVE_HIGH),
GPIO_LOOKUP("gpio-48-63", 10, "int",
GPIO_ACTIVE_HIGH),
{ }
},
};
static void __init n8x0_usb_init(void)
{
int ret = 0;
static const char announce[] __initconst = KERN_INFO "TUSB 6010\n";
/* PM companion chip power control pin */
ret = gpio_request_one(TUSB6010_GPIO_ENABLE, GPIOF_OUT_INIT_LOW,
"TUSB6010 enable");
if (ret != 0) {
printk(KERN_ERR "Could not get TUSB power GPIO%i\n",
TUSB6010_GPIO_ENABLE);
return;
}
tusb_set_power(0);
gpiod_add_lookup_table(&tusb_gpio_table);
ret = tusb6010_setup_interface(&tusb_data, TUSB6010_REFCLK_19, 2,
TUSB6010_ASYNC_CS, TUSB6010_SYNC_CS,
TUSB6010_GPIO_INT, TUSB6010_DMACHAN);
TUSB6010_ASYNC_CS, TUSB6010_SYNC_CS,
TUSB6010_DMACHAN);
if (ret != 0)
goto err;
return;
printk(announce);
pr_info("TUSB 6010\n");
return;
err:
gpio_free(TUSB6010_GPIO_ENABLE);
}
#else

20
arch/arm/mach-omap2/usb-tusb6010.c
View file

@ -11,12 +11,12 @@
#include <linux/errno.h>
#include <linux/delay.h>
#include <linux/platform_device.h>
#include <linux/gpio.h>
#include <linux/export.h>
#include <linux/platform_data/usb-omap.h>
#include <linux/usb/musb.h>
#include "usb-tusb6010.h"
#include "gpmc.h"
static u8 async_cs, sync_cs;
@ -132,10 +132,6 @@ static struct resource tusb_resources[] = {
{ /* Synchronous access */
.flags = IORESOURCE_MEM,
},
{ /* IRQ */
.name = "mc",
.flags = IORESOURCE_IRQ,
},
};
static u64 tusb_dmamask = ~(u32)0;
@ -154,9 +150,9 @@ static struct platform_device tusb_device = {
/* this may be called only from board-*.c setup code */
int __init tusb6010_setup_interface(struct musb_hdrc_platform_data *data,
unsigned ps_refclk, unsigned waitpin,
unsigned async, unsigned sync,
unsigned irq, unsigned dmachan)
unsigned int ps_refclk, unsigned int waitpin,
unsigned int async, unsigned int sync,
unsigned int dmachan)
{
int status;
static char error[] __initdata =
@ -192,14 +188,6 @@ int __init tusb6010_setup_interface(struct musb_hdrc_platform_data *data,
if (status < 0)
return status;
/* IRQ */
status = gpio_request_one(irq, GPIOF_IN, "TUSB6010 irq");
if (status < 0) {
printk(error, 3, status);
return status;
}
tusb_resources[2].start = gpio_to_irq(irq);
/* set up memory timings ... can speed them up later */
if (!ps_refclk) {
printk(error, 4, status);

12
arch/arm/mach-omap2/usb-tusb6010.h Normal file
View file

@ -0,0 +1,12 @@
/* SPDX-License-Identifier: GPL-2.0 */
#ifndef __USB_TUSB6010_H
#define __USB_TUSB6010_H
extern int __init tusb6010_setup_interface(
struct musb_hdrc_platform_data *data,
unsigned int ps_refclk, unsigned int waitpin,
unsigned int async_cs, unsigned int sync_cs,
unsigned int dmachan);
#endif /* __USB_TUSB6010_H */

1
drivers/usb/musb/musb_core.c
View file

@ -2330,7 +2330,6 @@ musb_init_controller(struct device *dev, int nIrq, void __iomem *ctrl)
spin_lock_init(&musb->lock);
spin_lock_init(&musb->list_lock);
musb->board_set_power = plat->set_power;
musb->min_power = plat->min_power;
musb->ops = plat->platform_ops;
musb->port_mode = plat->mode;

2
drivers/usb/musb/musb_core.h
View file

@ -352,8 +352,6 @@ struct musb {
u16 epmask;
u8 nr_endpoints;
int (*board_set_power)(int state);
u8 min_power; /* vbus for periph, in mA/2 */
enum musb_mode port_mode;

53
drivers/usb/musb/tusb6010.c
View file

@ -11,6 +11,8 @@
* interface.
*/
#include <linux/gpio/consumer.h>
#include <linux/delay.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/errno.h>
@ -30,6 +32,8 @@ struct tusb6010_glue {
struct device *dev;
struct platform_device *musb;
struct platform_device *phy;
struct gpio_desc *enable;
struct gpio_desc *intpin;
};
static void tusb_musb_set_vbus(struct musb *musb, int is_on);
@ -1021,16 +1025,29 @@ static void tusb_setup_cpu_interface(struct musb *musb)
static int tusb_musb_start(struct musb *musb)
{
struct tusb6010_glue *glue = dev_get_drvdata(musb->controller->parent);
void __iomem *tbase = musb->ctrl_base;
int ret = 0;
unsigned long flags;
u32 reg;
int i;
if (musb->board_set_power)
ret = musb->board_set_power(1);
if (ret != 0) {
printk(KERN_ERR "tusb: Cannot enable TUSB6010\n");
return ret;
/*
* Enable or disable power to TUSB6010. When enabling, turn on 3.3 V and
* 1.5 V voltage regulators of PM companion chip. Companion chip will then
* provide then PGOOD signal to TUSB6010 which will release it from reset.
*/
gpiod_set_value(glue->enable, 1);
msleep(1);
/* Wait for 100ms until TUSB6010 pulls INT pin down */
i = 100;
while (i && gpiod_get_value(glue->intpin)) {
msleep(1);
i--;
}
if (!i) {
pr_err("tusb: Powerup respones failed\n");
return -ENODEV;
}
spin_lock_irqsave(&musb->lock, flags);
@ -1083,8 +1100,8 @@ static int tusb_musb_start(struct musb *musb)
err:
spin_unlock_irqrestore(&musb->lock, flags);
if (musb->board_set_power)
musb->board_set_power(0);
gpiod_set_value(glue->enable, 0);
msleep(10);
return -ENODEV;
}
@ -1158,11 +1175,13 @@ static int tusb_musb_init(struct musb *musb)
static int tusb_musb_exit(struct musb *musb)
{
struct tusb6010_glue *glue = dev_get_drvdata(musb->controller->parent);
del_timer_sync(&musb->dev_timer);
the_musb = NULL;
if (musb->board_set_power)
musb->board_set_power(0);
gpiod_set_value(glue->enable, 0);
msleep(10);
iounmap(musb->sync_va);
@ -1218,6 +1237,15 @@ static int tusb_probe(struct platform_device *pdev)
glue->dev = &pdev->dev;
glue->enable = devm_gpiod_get(glue->dev, "enable", GPIOD_OUT_LOW);
if (IS_ERR(glue->enable))
return dev_err_probe(glue->dev, PTR_ERR(glue->enable),
"could not obtain power on/off GPIO\n");
glue->intpin = devm_gpiod_get(glue->dev, "int", GPIOD_IN);
if (IS_ERR(glue->intpin))
return dev_err_probe(glue->dev, PTR_ERR(glue->intpin),
"could not obtain INT GPIO\n");
pdata->platform_ops = &tusb_ops;
usb_phy_generic_register();
@ -1236,10 +1264,7 @@ static int tusb_probe(struct platform_device *pdev)
musb_resources[1].end = pdev->resource[1].end;
musb_resources[1].flags = pdev->resource[1].flags;
musb_resources[2].name = pdev->resource[2].name;
musb_resources[2].start = pdev->resource[2].start;
musb_resources[2].end = pdev->resource[2].end;
musb_resources[2].flags = pdev->resource[2].flags;
musb_resources[2] = DEFINE_RES_IRQ_NAMED(gpiod_to_irq(glue->intpin), "mc");
pinfo = tusb_dev_info;
pinfo.parent = &pdev->dev;

13
include/linux/usb/musb.h
View file

@ -99,9 +99,6 @@ struct musb_hdrc_platform_data {
/* (HOST or OTG) program PHY for external Vbus */
unsigned extvbus:1;
/* Power the device on or off */
int (*set_power)(int state);
/* MUSB configuration-specific details */
const struct musb_hdrc_config *config;
@ -135,14 +132,4 @@ static inline int musb_mailbox(enum musb_vbus_id_status status)
#define TUSB6010_REFCLK_24 41667 /* psec/clk @ 24.0 MHz XI */
#define TUSB6010_REFCLK_19 52083 /* psec/clk @ 19.2 MHz CLKIN */
#ifdef CONFIG_ARCH_OMAP2
extern int __init tusb6010_setup_interface(
struct musb_hdrc_platform_data *data,
unsigned ps_refclk, unsigned waitpin,
unsigned async_cs, unsigned sync_cs,
unsigned irq, unsigned dmachan);
#endif /* OMAP2 */
#endif /* __LINUX_USB_MUSB_H */