upstream u-boot with additional patches for our devices/boards:
https://lists.denx.de/pipermail/u-boot/2017-March/282789.html (AXP crashes) ;
Gbit ethernet patch for some LIME2 revisions ;
with SPI flash support
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544 lines
15 KiB
544 lines
15 KiB
/*
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* Copyright (C) 1994, 1995 Waldorf GmbH
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* Copyright (C) 1994 - 2000, 06 Ralf Baechle
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* Copyright (C) 1999, 2000 Silicon Graphics, Inc.
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* Copyright (C) 2004, 2005 MIPS Technologies, Inc. All rights reserved.
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* Author: Maciej W. Rozycki <macro@mips.com>
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*
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* SPDX-License-Identifier: GPL-2.0
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*/
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#ifndef _ASM_IO_H
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#define _ASM_IO_H
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#include <linux/compiler.h>
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#include <linux/types.h>
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#include <asm/addrspace.h>
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#include <asm/byteorder.h>
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#include <asm/cpu-features.h>
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#include <asm/pgtable-bits.h>
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#include <asm/processor.h>
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#include <asm/string.h>
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#include <ioremap.h>
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#include <mangle-port.h>
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#include <spaces.h>
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/*
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* Slowdown I/O port space accesses for antique hardware.
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*/
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#undef CONF_SLOWDOWN_IO
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/*
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* Raw operations are never swapped in software. OTOH values that raw
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* operations are working on may or may not have been swapped by the bus
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* hardware. An example use would be for flash memory that's used for
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* execute in place.
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*/
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# define __raw_ioswabb(a, x) (x)
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# define __raw_ioswabw(a, x) (x)
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# define __raw_ioswabl(a, x) (x)
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# define __raw_ioswabq(a, x) (x)
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# define ____raw_ioswabq(a, x) (x)
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/* ioswab[bwlq], __mem_ioswab[bwlq] are defined in mangle-port.h */
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#define IO_SPACE_LIMIT 0xffff
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/*
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* On MIPS I/O ports are memory mapped, so we access them using normal
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* load/store instructions. mips_io_port_base is the virtual address to
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* which all ports are being mapped. For sake of efficiency some code
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* assumes that this is an address that can be loaded with a single lui
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* instruction, so the lower 16 bits must be zero. Should be true on
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* on any sane architecture; generic code does not use this assumption.
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*/
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extern const unsigned long mips_io_port_base;
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/*
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* Gcc will generate code to load the value of mips_io_port_base after each
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* function call which may be fairly wasteful in some cases. So we don't
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* play quite by the book. We tell gcc mips_io_port_base is a long variable
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* which solves the code generation issue. Now we need to violate the
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* aliasing rules a little to make initialization possible and finally we
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* will need the barrier() to fight side effects of the aliasing chat.
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* This trickery will eventually collapse under gcc's optimizer. Oh well.
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*/
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static inline void set_io_port_base(unsigned long base)
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{
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* (unsigned long *) &mips_io_port_base = base;
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barrier();
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}
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/*
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* Thanks to James van Artsdalen for a better timing-fix than
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* the two short jumps: using outb's to a nonexistent port seems
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* to guarantee better timings even on fast machines.
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*
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* On the other hand, I'd like to be sure of a non-existent port:
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* I feel a bit unsafe about using 0x80 (should be safe, though)
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*
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* Linus
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*
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*/
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#define __SLOW_DOWN_IO \
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__asm__ __volatile__( \
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"sb\t$0,0x80(%0)" \
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: : "r" (mips_io_port_base));
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#ifdef CONF_SLOWDOWN_IO
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#ifdef REALLY_SLOW_IO
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#define SLOW_DOWN_IO { __SLOW_DOWN_IO; __SLOW_DOWN_IO; __SLOW_DOWN_IO; __SLOW_DOWN_IO; }
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#else
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#define SLOW_DOWN_IO __SLOW_DOWN_IO
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#endif
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#else
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#define SLOW_DOWN_IO
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#endif
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/*
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* virt_to_phys - map virtual addresses to physical
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* @address: address to remap
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*
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* The returned physical address is the physical (CPU) mapping for
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* the memory address given. It is only valid to use this function on
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* addresses directly mapped or allocated via kmalloc.
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*
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* This function does not give bus mappings for DMA transfers. In
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* almost all conceivable cases a device driver should not be using
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* this function
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*/
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static inline unsigned long virt_to_phys(volatile const void *address)
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{
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unsigned long addr = (unsigned long)address;
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/* this corresponds to kernel implementation of __pa() */
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#ifdef CONFIG_64BIT
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if (addr < CKSEG0)
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return XPHYSADDR(addr);
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return CPHYSADDR(addr);
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#else
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return addr - PAGE_OFFSET + PHYS_OFFSET;
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#endif
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}
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/*
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* phys_to_virt - map physical address to virtual
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* @address: address to remap
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*
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* The returned virtual address is a current CPU mapping for
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* the memory address given. It is only valid to use this function on
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* addresses that have a kernel mapping
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*
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* This function does not handle bus mappings for DMA transfers. In
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* almost all conceivable cases a device driver should not be using
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* this function
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*/
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static inline void *phys_to_virt(unsigned long address)
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{
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return (void *)(address + PAGE_OFFSET - PHYS_OFFSET);
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}
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/*
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* ISA I/O bus memory addresses are 1:1 with the physical address.
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*/
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static inline unsigned long isa_virt_to_bus(volatile void *address)
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{
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return (unsigned long)address - PAGE_OFFSET;
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}
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static inline void *isa_bus_to_virt(unsigned long address)
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{
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return (void *)(address + PAGE_OFFSET);
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}
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#define isa_page_to_bus page_to_phys
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/*
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* However PCI ones are not necessarily 1:1 and therefore these interfaces
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* are forbidden in portable PCI drivers.
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*
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* Allow them for x86 for legacy drivers, though.
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*/
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#define virt_to_bus virt_to_phys
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#define bus_to_virt phys_to_virt
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static inline void __iomem *__ioremap_mode(phys_addr_t offset, unsigned long size,
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unsigned long flags)
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{
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void __iomem *addr;
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phys_addr_t phys_addr;
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addr = plat_ioremap(offset, size, flags);
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if (addr)
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return addr;
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phys_addr = fixup_bigphys_addr(offset, size);
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return (void __iomem *)(unsigned long)CKSEG1ADDR(phys_addr);
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}
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/*
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* ioremap - map bus memory into CPU space
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* @offset: bus address of the memory
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* @size: size of the resource to map
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*
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* ioremap performs a platform specific sequence of operations to
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* make bus memory CPU accessible via the readb/readw/readl/writeb/
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* writew/writel functions and the other mmio helpers. The returned
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* address is not guaranteed to be usable directly as a virtual
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* address.
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*/
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#define ioremap(offset, size) \
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__ioremap_mode((offset), (size), _CACHE_UNCACHED)
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/*
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* ioremap_nocache - map bus memory into CPU space
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* @offset: bus address of the memory
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* @size: size of the resource to map
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*
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* ioremap_nocache performs a platform specific sequence of operations to
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* make bus memory CPU accessible via the readb/readw/readl/writeb/
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* writew/writel functions and the other mmio helpers. The returned
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* address is not guaranteed to be usable directly as a virtual
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* address.
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*
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* This version of ioremap ensures that the memory is marked uncachable
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* on the CPU as well as honouring existing caching rules from things like
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* the PCI bus. Note that there are other caches and buffers on many
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* busses. In particular driver authors should read up on PCI writes
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*
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* It's useful if some control registers are in such an area and
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* write combining or read caching is not desirable:
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*/
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#define ioremap_nocache(offset, size) \
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__ioremap_mode((offset), (size), _CACHE_UNCACHED)
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#define ioremap_uc ioremap_nocache
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/*
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* ioremap_cachable - map bus memory into CPU space
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* @offset: bus address of the memory
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* @size: size of the resource to map
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*
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* ioremap_nocache performs a platform specific sequence of operations to
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* make bus memory CPU accessible via the readb/readw/readl/writeb/
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* writew/writel functions and the other mmio helpers. The returned
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* address is not guaranteed to be usable directly as a virtual
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* address.
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*
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* This version of ioremap ensures that the memory is marked cachable by
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* the CPU. Also enables full write-combining. Useful for some
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* memory-like regions on I/O busses.
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*/
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#define ioremap_cachable(offset, size) \
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__ioremap_mode((offset), (size), _page_cachable_default)
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/*
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* These two are MIPS specific ioremap variant. ioremap_cacheable_cow
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* requests a cachable mapping, ioremap_uncached_accelerated requests a
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* mapping using the uncached accelerated mode which isn't supported on
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* all processors.
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*/
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#define ioremap_cacheable_cow(offset, size) \
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__ioremap_mode((offset), (size), _CACHE_CACHABLE_COW)
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#define ioremap_uncached_accelerated(offset, size) \
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__ioremap_mode((offset), (size), _CACHE_UNCACHED_ACCELERATED)
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static inline void iounmap(const volatile void __iomem *addr)
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{
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plat_iounmap(addr);
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}
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#ifdef CONFIG_CPU_CAVIUM_OCTEON
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#define war_octeon_io_reorder_wmb() wmb()
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#else
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#define war_octeon_io_reorder_wmb() do { } while (0)
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#endif
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#define __BUILD_MEMORY_SINGLE(pfx, bwlq, type, irq) \
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\
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static inline void pfx##write##bwlq(type val, \
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volatile void __iomem *mem) \
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{ \
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volatile type *__mem; \
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type __val; \
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\
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war_octeon_io_reorder_wmb(); \
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\
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__mem = (void *)__swizzle_addr_##bwlq((unsigned long)(mem)); \
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\
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__val = pfx##ioswab##bwlq(__mem, val); \
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\
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if (sizeof(type) != sizeof(u64) || sizeof(u64) == sizeof(long)) \
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*__mem = __val; \
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else if (cpu_has_64bits) { \
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type __tmp; \
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\
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__asm__ __volatile__( \
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".set arch=r4000" "\t\t# __writeq""\n\t" \
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"dsll32 %L0, %L0, 0" "\n\t" \
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"dsrl32 %L0, %L0, 0" "\n\t" \
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"dsll32 %M0, %M0, 0" "\n\t" \
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"or %L0, %L0, %M0" "\n\t" \
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"sd %L0, %2" "\n\t" \
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".set mips0" "\n" \
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: "=r" (__tmp) \
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: "0" (__val), "m" (*__mem)); \
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} else \
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BUG(); \
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} \
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\
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static inline type pfx##read##bwlq(const volatile void __iomem *mem) \
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{ \
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volatile type *__mem; \
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type __val; \
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\
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__mem = (void *)__swizzle_addr_##bwlq((unsigned long)(mem)); \
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\
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if (sizeof(type) != sizeof(u64) || sizeof(u64) == sizeof(long)) \
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__val = *__mem; \
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else if (cpu_has_64bits) { \
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__asm__ __volatile__( \
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".set arch=r4000" "\t\t# __readq" "\n\t" \
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"ld %L0, %1" "\n\t" \
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"dsra32 %M0, %L0, 0" "\n\t" \
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"sll %L0, %L0, 0" "\n\t" \
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".set mips0" "\n" \
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: "=r" (__val) \
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: "m" (*__mem)); \
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} else { \
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__val = 0; \
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BUG(); \
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} \
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\
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return pfx##ioswab##bwlq(__mem, __val); \
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}
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#define __BUILD_IOPORT_SINGLE(pfx, bwlq, type, p, slow) \
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\
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static inline void pfx##out##bwlq##p(type val, unsigned long port) \
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{ \
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volatile type *__addr; \
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type __val; \
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\
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war_octeon_io_reorder_wmb(); \
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\
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__addr = (void *)__swizzle_addr_##bwlq(mips_io_port_base + port); \
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\
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__val = pfx##ioswab##bwlq(__addr, val); \
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\
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/* Really, we want this to be atomic */ \
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BUILD_BUG_ON(sizeof(type) > sizeof(unsigned long)); \
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\
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*__addr = __val; \
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slow; \
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} \
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\
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static inline type pfx##in##bwlq##p(unsigned long port) \
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{ \
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volatile type *__addr; \
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type __val; \
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\
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__addr = (void *)__swizzle_addr_##bwlq(mips_io_port_base + port); \
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\
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BUILD_BUG_ON(sizeof(type) > sizeof(unsigned long)); \
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\
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__val = *__addr; \
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slow; \
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\
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return pfx##ioswab##bwlq(__addr, __val); \
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}
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#define __BUILD_MEMORY_PFX(bus, bwlq, type) \
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\
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__BUILD_MEMORY_SINGLE(bus, bwlq, type, 1)
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#define BUILDIO_MEM(bwlq, type) \
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\
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__BUILD_MEMORY_PFX(__raw_, bwlq, type) \
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__BUILD_MEMORY_PFX(, bwlq, type) \
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__BUILD_MEMORY_PFX(__mem_, bwlq, type) \
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BUILDIO_MEM(b, u8)
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BUILDIO_MEM(w, u16)
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BUILDIO_MEM(l, u32)
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BUILDIO_MEM(q, u64)
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#define __BUILD_IOPORT_PFX(bus, bwlq, type) \
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__BUILD_IOPORT_SINGLE(bus, bwlq, type, ,) \
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__BUILD_IOPORT_SINGLE(bus, bwlq, type, _p, SLOW_DOWN_IO)
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#define BUILDIO_IOPORT(bwlq, type) \
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__BUILD_IOPORT_PFX(, bwlq, type) \
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__BUILD_IOPORT_PFX(__mem_, bwlq, type)
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BUILDIO_IOPORT(b, u8)
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BUILDIO_IOPORT(w, u16)
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BUILDIO_IOPORT(l, u32)
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#ifdef CONFIG_64BIT
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BUILDIO_IOPORT(q, u64)
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#endif
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#define __BUILDIO(bwlq, type) \
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\
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__BUILD_MEMORY_SINGLE(____raw_, bwlq, type, 0)
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__BUILDIO(q, u64)
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#define readb_relaxed readb
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#define readw_relaxed readw
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#define readl_relaxed readl
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#define readq_relaxed readq
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#define writeb_relaxed writeb
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#define writew_relaxed writew
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#define writel_relaxed writel
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#define writeq_relaxed writeq
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#define readb_be(addr) \
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__raw_readb((__force unsigned *)(addr))
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#define readw_be(addr) \
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be16_to_cpu(__raw_readw((__force unsigned *)(addr)))
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#define readl_be(addr) \
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be32_to_cpu(__raw_readl((__force unsigned *)(addr)))
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#define readq_be(addr) \
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be64_to_cpu(__raw_readq((__force unsigned *)(addr)))
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#define writeb_be(val, addr) \
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__raw_writeb((val), (__force unsigned *)(addr))
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#define writew_be(val, addr) \
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__raw_writew(cpu_to_be16((val)), (__force unsigned *)(addr))
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#define writel_be(val, addr) \
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__raw_writel(cpu_to_be32((val)), (__force unsigned *)(addr))
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#define writeq_be(val, addr) \
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__raw_writeq(cpu_to_be64((val)), (__force unsigned *)(addr))
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/*
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|
* Some code tests for these symbols
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|
*/
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#define readq readq
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#define writeq writeq
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#define __BUILD_MEMORY_STRING(bwlq, type) \
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|
\
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static inline void writes##bwlq(volatile void __iomem *mem, \
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|
const void *addr, unsigned int count) \
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|
{ \
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const volatile type *__addr = addr; \
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|
\
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while (count--) { \
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__mem_write##bwlq(*__addr, mem); \
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__addr++; \
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} \
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} \
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\
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static inline void reads##bwlq(volatile void __iomem *mem, void *addr, \
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|
unsigned int count) \
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|
{ \
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|
volatile type *__addr = addr; \
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|
\
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|
while (count--) { \
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|
*__addr = __mem_read##bwlq(mem); \
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__addr++; \
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} \
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|
}
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|
|
|
#define __BUILD_IOPORT_STRING(bwlq, type) \
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|
\
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|
static inline void outs##bwlq(unsigned long port, const void *addr, \
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|
unsigned int count) \
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|
{ \
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|
const volatile type *__addr = addr; \
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|
\
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while (count--) { \
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|
__mem_out##bwlq(*__addr, port); \
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__addr++; \
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} \
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} \
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\
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static inline void ins##bwlq(unsigned long port, void *addr, \
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|
unsigned int count) \
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|
{ \
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volatile type *__addr = addr; \
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|
\
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|
while (count--) { \
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*__addr = __mem_in##bwlq(port); \
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__addr++; \
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} \
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}
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#define BUILDSTRING(bwlq, type) \
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\
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__BUILD_MEMORY_STRING(bwlq, type) \
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__BUILD_IOPORT_STRING(bwlq, type)
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BUILDSTRING(b, u8)
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BUILDSTRING(w, u16)
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BUILDSTRING(l, u32)
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|
#ifdef CONFIG_64BIT
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BUILDSTRING(q, u64)
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|
#endif
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|
|
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|
#ifdef CONFIG_CPU_CAVIUM_OCTEON
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|
#define mmiowb() wmb()
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#else
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/* Depends on MIPS II instruction set */
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#define mmiowb() asm volatile ("sync" ::: "memory")
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#endif
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static inline void memset_io(volatile void __iomem *addr, unsigned char val, int count)
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{
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memset((void __force *)addr, val, count);
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}
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static inline void memcpy_fromio(void *dst, const volatile void __iomem *src, int count)
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|
{
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|
memcpy(dst, (void __force *)src, count);
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|
}
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|
static inline void memcpy_toio(volatile void __iomem *dst, const void *src, int count)
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|
{
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|
memcpy((void __force *)dst, src, count);
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|
}
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|
|
/*
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|
* Read a 32-bit register that requires a 64-bit read cycle on the bus.
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|
* Avoid interrupt mucking, just adjust the address for 4-byte access.
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|
* Assume the addresses are 8-byte aligned.
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|
*/
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|
#ifdef __MIPSEB__
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|
#define __CSR_32_ADJUST 4
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|
#else
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|
#define __CSR_32_ADJUST 0
|
|
#endif
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|
|
|
#define csr_out32(v, a) (*(volatile u32 *)((unsigned long)(a) + __CSR_32_ADJUST) = (v))
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|
#define csr_in32(a) (*(volatile u32 *)((unsigned long)(a) + __CSR_32_ADJUST))
|
|
|
|
/*
|
|
* U-Boot specific
|
|
*/
|
|
#define sync() mmiowb()
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|
|
|
#define MAP_NOCACHE (1)
|
|
#define MAP_WRCOMBINE (0)
|
|
#define MAP_WRBACK (0)
|
|
#define MAP_WRTHROUGH (0)
|
|
|
|
static inline void *
|
|
map_physmem(phys_addr_t paddr, unsigned long len, unsigned long flags)
|
|
{
|
|
if (flags == MAP_NOCACHE)
|
|
return ioremap(paddr, len);
|
|
|
|
return (void *)paddr;
|
|
}
|
|
|
|
/*
|
|
* Take down a mapping set up by map_physmem().
|
|
*/
|
|
static inline void unmap_physmem(void *vaddr, unsigned long flags)
|
|
{
|
|
}
|
|
|
|
#endif /* _ASM_IO_H */
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|
|