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usb: atmel_usba_udc: Add at91sam9g45 and at91sam9x5 errata handling

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at91sam9g45 and at91sam9x5 SoCs have an hardware bug forcing us to
generate a pulse on the BIAS signal on "USB end of reset” and
“USB end of resume" events.

Acked-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
Reported-by: Patrice VILCHEZ <patrice.vilchez@atmel.com>
Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>
This commit is contained in:
Boris Brezillon 2015-01-06 14:46:59 +01:00 committed by Felipe Balbi
parent 3280e67536
commit 258e2ddd63
2 changed files with 29 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

28
drivers/usb/gadget/udc/atmel_usba_udc.c
View File

@ -331,6 +331,17 @@ static void toggle_bias(struct usba_udc *udc, int is_on)
udc->errata->toggle_bias(udc, is_on);
}
static void generate_bias_pulse(struct usba_udc *udc)
{
if (!udc->bias_pulse_needed)
return;
if (udc->errata && udc->errata->pulse_bias)
udc->errata->pulse_bias(udc);
udc->bias_pulse_needed = false;
}
static void next_fifo_transaction(struct usba_ep *ep, struct usba_request *req)
{
unsigned int transaction_len;
@ -1607,6 +1618,7 @@ static irqreturn_t usba_udc_irq(int irq, void *devid)
if (status & USBA_DET_SUSPEND) {
toggle_bias(udc, 0);
usba_writel(udc, INT_CLR, USBA_DET_SUSPEND);
udc->bias_pulse_needed = true;
DBG(DBG_BUS, "Suspend detected\n");
if (udc->gadget.speed != USB_SPEED_UNKNOWN
&& udc->driver && udc->driver->suspend) {
@ -1624,6 +1636,7 @@ static irqreturn_t usba_udc_irq(int irq, void *devid)
if (status & USBA_END_OF_RESUME) {
usba_writel(udc, INT_CLR, USBA_END_OF_RESUME);
generate_bias_pulse(udc);
DBG(DBG_BUS, "Resume detected\n");
if (udc->gadget.speed != USB_SPEED_UNKNOWN
&& udc->driver && udc->driver->resume) {
@ -1659,6 +1672,7 @@ static irqreturn_t usba_udc_irq(int irq, void *devid)
struct usba_ep *ep0;
usba_writel(udc, INT_CLR, USBA_END_OF_RESET);
generate_bias_pulse(udc);
reset_all_endpoints(udc);
if (udc->gadget.speed != USB_SPEED_UNKNOWN && udc->driver) {
@ -1818,13 +1832,25 @@ static void at91sam9rl_toggle_bias(struct usba_udc *udc, int is_on)
at91_pmc_write(AT91_CKGR_UCKR, uckr & ~(AT91_PMC_BIASEN));
}
static void at91sam9g45_pulse_bias(struct usba_udc *udc)
{
unsigned int uckr = at91_pmc_read(AT91_CKGR_UCKR);
at91_pmc_write(AT91_CKGR_UCKR, uckr & ~(AT91_PMC_BIASEN));
at91_pmc_write(AT91_CKGR_UCKR, uckr | AT91_PMC_BIASEN);
}
static const struct usba_udc_errata at91sam9rl_errata = {
.toggle_bias = at91sam9rl_toggle_bias,
};
static const struct usba_udc_errata at91sam9g45_errata = {
.pulse_bias = at91sam9g45_pulse_bias,
};
static const struct of_device_id atmel_udc_dt_ids[] = {
{ .compatible = "atmel,at91sam9rl-udc", .data = &at91sam9rl_errata },
{ .compatible = "atmel,at91sam9g45-udc" },
{ .compatible = "atmel,at91sam9g45-udc", .data = &at91sam9g45_errata },
{ .compatible = "atmel,sama5d3-udc" },
{ /* sentinel */ }
};

2
drivers/usb/gadget/udc/atmel_usba_udc.h
View File

@ -306,6 +306,7 @@ struct usba_request {
struct usba_udc_errata {
void (*toggle_bias)(struct usba_udc *udc, int is_on);
void (*pulse_bias)(struct usba_udc *udc);
};
struct usba_udc {
@ -326,6 +327,7 @@ struct usba_udc {
struct clk *pclk;
struct clk *hclk;
struct usba_ep *usba_ep;
bool bias_pulse_needed;
u16 devstatus;