arch/powerpc/platforms/83xx/usb_831x.c

Source file repositories/reference/linux-study-clean/arch/powerpc/platforms/83xx/usb_831x.c

File Facts

System
Linux kernel
Corpus path
arch/powerpc/platforms/83xx/usb_831x.c
Extension
.c
Size
3348 bytes
Lines
129
Domain
Architecture Layer
Bucket
arch/powerpc
Inferred role
Architecture Layer: implementation source
Status
source implementation candidate

Why This File Exists

CPU and platform-specific kernel glue: boot entry, traps, syscall entry, interrupts, page tables, context switch, and low-level barriers.

Dependency Surface

Detected Declarations

Annotated Snippet

if (of_device_is_compatible(immr_node, "fsl,mpc8308-immr")) {
			clrsetbits_be32(immap + MPC83XX_SICRH_OFFS,
					MPC8308_SICRH_USB_MASK,
					MPC8308_SICRH_USB_ULPI);
		} else if (of_device_is_compatible(immr_node, "fsl,mpc8315-immr")) {
			clrsetbits_be32(immap + MPC83XX_SICRL_OFFS,
					MPC8315_SICRL_USB_MASK,
					MPC8315_SICRL_USB_ULPI);
			clrsetbits_be32(immap + MPC83XX_SICRH_OFFS,
					MPC8315_SICRH_USB_MASK,
					MPC8315_SICRH_USB_ULPI);
		} else {
			clrsetbits_be32(immap + MPC83XX_SICRL_OFFS,
					MPC831X_SICRL_USB_MASK,
					MPC831X_SICRL_USB_ULPI);
			clrsetbits_be32(immap + MPC83XX_SICRH_OFFS,
					MPC831X_SICRH_USB_MASK,
					MPC831X_SICRH_USB_ULPI);
		}
	}

	iounmap(immap);

	of_node_put(immr_node);

	/* Map USB SOC space */
	ret = of_address_to_resource(np, 0, &res);
	if (ret) {
		of_node_put(np);
		return ret;
	}
	usb_regs = ioremap(res.start, resource_size(&res));

	/* Using on-chip PHY */
	if (prop && (!strcmp(prop, "utmi_wide") || !strcmp(prop, "utmi"))) {
		u32 refsel;

		if (of_device_is_compatible(immr_node, "fsl,mpc8308-immr"))
			goto out;

		if (of_device_is_compatible(immr_node, "fsl,mpc8315-immr"))
			refsel = CONTROL_REFSEL_24MHZ;
		else
			refsel = CONTROL_REFSEL_48MHZ;
		/* Set UTMI_PHY_EN and REFSEL */
		out_be32(usb_regs + FSL_USB2_CONTROL_OFFS,
			 CONTROL_UTMI_PHY_EN | refsel);
	/* Using external UPLI PHY */
	} else if (prop && !strcmp(prop, "ulpi")) {
		/* Set PHY_CLK_SEL to ULPI */
		temp = CONTROL_PHY_CLK_SEL_ULPI;
#ifdef CONFIG_USB_OTG
		/* Set OTG_PORT */
		if (!of_device_is_compatible(immr_node, "fsl,mpc8308-immr")) {
			dr_mode = of_get_property(np, "dr_mode", NULL);
			if (dr_mode && !strcmp(dr_mode, "otg"))
				temp |= CONTROL_OTG_PORT;
		}
#endif /* CONFIG_USB_OTG */
		out_be32(usb_regs + FSL_USB2_CONTROL_OFFS, temp);
	} else {
		pr_warn("831x USB PHY type not supported\n");
		ret = -EINVAL;
	}

out:
	iounmap(usb_regs);
	of_node_put(np);
	return ret;
}

Annotation

Implementation Notes