| /** |
| * io.h - DesignWare USB3 DRD IO Header |
| * |
| * Copyright (C) 2010-2011 Texas Instruments Incorporated - http://www.ti.com |
| * |
| * Authors: Felipe Balbi <balbi@ti.com>, |
| * Sebastian Andrzej Siewior <bigeasy@linutronix.de> |
| * |
| * This program is free software: you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License version 2 of |
| * the License as published by the Free Software Foundation. |
| * |
| * This program is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| * GNU General Public License for more details. |
| */ |
| |
| #ifndef __DRIVERS_USB_DWC3_IO_H |
| #define __DRIVERS_USB_DWC3_IO_H |
| |
| #include <linux/io.h> |
| #include "trace.h" |
| #include "debug.h" |
| #include "core.h" |
| |
| static inline u32 dwc3_readl(void __iomem *base, u32 offset) |
| { |
| u32 value; |
| |
| /* |
| * We requested the mem region starting from the Globals address |
| * space, see dwc3_probe in core.c. |
| * However, the offsets are given starting from xHCI address space. |
| */ |
| value = readl(base + offset - DWC3_GLOBALS_REGS_START); |
| |
| /* |
| * When tracing we want to make it easy to find the correct address on |
| * documentation, so we revert it back to the proper addresses, the |
| * same way they are described on SNPS documentation |
| */ |
| dwc3_trace(trace_dwc3_readl, "addr %p value %08x", |
| base - DWC3_GLOBALS_REGS_START + offset, value); |
| |
| return value; |
| } |
| |
| static inline void dwc3_writel(void __iomem *base, u32 offset, u32 value) |
| { |
| /* |
| * We requested the mem region starting from the Globals address |
| * space, see dwc3_probe in core.c. |
| * However, the offsets are given starting from xHCI address space. |
| */ |
| writel(value, base + offset - DWC3_GLOBALS_REGS_START); |
| |
| /* |
| * When tracing we want to make it easy to find the correct address on |
| * documentation, so we revert it back to the proper addresses, the |
| * same way they are described on SNPS documentation |
| */ |
| dwc3_trace(trace_dwc3_writel, "addr %p value %08x", |
| base - DWC3_GLOBALS_REGS_START + offset, value); |
| } |
| |
| static inline void dwc3_masked_write_readback(void __iomem *base, |
| u32 offset, const u32 mask, u32 value) |
| { |
| u32 write_val, tmp; |
| |
| tmp = readl_relaxed(base + offset - DWC3_GLOBALS_REGS_START); |
| tmp &= ~mask; /* retain other bits */ |
| write_val = tmp | value; |
| |
| writel_relaxed(write_val, base + offset - DWC3_GLOBALS_REGS_START); |
| |
| /* Read back to see if value was written */ |
| tmp = readl_relaxed(base + offset); |
| |
| dwc3_trace(trace_dwc3_masked_write_readback, |
| "addr %p readback val %08x", |
| base - DWC3_GLOBALS_REGS_START + offset, tmp); |
| |
| tmp &= mask; /* clear other bits */ |
| if (tmp != value) |
| pr_err("%s: write: %x to %x FAILED\n", |
| __func__, value, offset); |
| } |
| |
| #endif /* __DRIVERS_USB_DWC3_IO_H */ |