drivers/ssb/driver_extif.c

Source file repositories/reference/linux-study-clean/drivers/ssb/driver_extif.c

File Facts

System
Linux kernel
Corpus path
drivers/ssb/driver_extif.c
Extension
.c
Size
5119 bytes
Lines
202
Domain
Driver Families
Bucket
drivers/ssb
Inferred role
Driver Families: implementation source
Status
source implementation candidate

Why This File Exists

Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.

Dependency Surface

Detected Declarations

Annotated Snippet

if (uart_regs) {
			uart_regs += (i * 8);

			if (serial_exists(uart_regs) && ports) {
				extif_write32(extif, SSB_EXTIF_GPIO_INTMASK, 2);

				nr_ports++;
				ports[i].regs = uart_regs;
				ports[i].irq = 2;
				ports[i].baud_base = 13500000;
				ports[i].reg_shift = 0;
			}
			iounmap(uart_regs);
		}
	}
	return nr_ports;
}
#endif /* CONFIG_SSB_SERIAL */

void ssb_extif_timing_init(struct ssb_extif *extif, unsigned long ns)
{
	u32 tmp;

	/* Initialize extif so we can get to the LEDs and external UART */
	extif_write32(extif, SSB_EXTIF_PROG_CFG, SSB_EXTCFG_EN);

	/* Set timing for the flash */
	tmp  = DIV_ROUND_UP(10, ns) << SSB_PROG_WCNT_3_SHIFT;
	tmp |= DIV_ROUND_UP(40, ns) << SSB_PROG_WCNT_1_SHIFT;
	tmp |= DIV_ROUND_UP(120, ns);
	extif_write32(extif, SSB_EXTIF_PROG_WAITCNT, tmp);

	/* Set programmable interface timing for external uart */
	tmp  = DIV_ROUND_UP(10, ns) << SSB_PROG_WCNT_3_SHIFT;
	tmp |= DIV_ROUND_UP(20, ns) << SSB_PROG_WCNT_2_SHIFT;
	tmp |= DIV_ROUND_UP(100, ns) << SSB_PROG_WCNT_1_SHIFT;
	tmp |= DIV_ROUND_UP(120, ns);
	extif_write32(extif, SSB_EXTIF_PROG_WAITCNT, tmp);
}

void ssb_extif_get_clockcontrol(struct ssb_extif *extif,
				u32 *pll_type, u32 *n, u32 *m)
{
	*pll_type = SSB_PLLTYPE_1;
	*n = extif_read32(extif, SSB_EXTIF_CLOCK_N);
	*m = extif_read32(extif, SSB_EXTIF_CLOCK_SB);
}

u32 ssb_extif_watchdog_timer_set_wdt(struct bcm47xx_wdt *wdt, u32 ticks)
{
	struct ssb_extif *extif = bcm47xx_wdt_get_drvdata(wdt);

	return ssb_extif_watchdog_timer_set(extif, ticks);
}

u32 ssb_extif_watchdog_timer_set_ms(struct bcm47xx_wdt *wdt, u32 ms)
{
	struct ssb_extif *extif = bcm47xx_wdt_get_drvdata(wdt);
	u32 ticks = (SSB_EXTIF_WATCHDOG_CLK / 1000) * ms;

	ticks = ssb_extif_watchdog_timer_set(extif, ticks);

	return (ticks * 1000) / SSB_EXTIF_WATCHDOG_CLK;
}

u32 ssb_extif_watchdog_timer_set(struct ssb_extif *extif, u32 ticks)
{
	if (ticks > SSB_EXTIF_WATCHDOG_MAX_TIMER)
		ticks = SSB_EXTIF_WATCHDOG_MAX_TIMER;
	extif_write32(extif, SSB_EXTIF_WATCHDOG, ticks);

	return ticks;
}

void ssb_extif_init(struct ssb_extif *extif)
{
	if (!extif->dev)
		return; /* We don't have a Extif core */
	spin_lock_init(&extif->gpio_lock);
}

u32 ssb_extif_gpio_in(struct ssb_extif *extif, u32 mask)
{
	return extif_read32(extif, SSB_EXTIF_GPIO_IN) & mask;
}

u32 ssb_extif_gpio_out(struct ssb_extif *extif, u32 mask, u32 value)
{
	unsigned long flags;
	u32 res = 0;

Annotation

Implementation Notes