321 lines
8.5 KiB
C
321 lines
8.5 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Copyright (C) 2017 HiSilicon Limited, All Rights Reserved.
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* Author: Gabriele Paoloni <gabriele.paoloni@huawei.com>
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* Author: Zhichang Yuan <yuanzhichang@hisilicon.com>
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* Author: John Garry <john.garry@huawei.com>
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*/
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#define pr_fmt(fmt) "LOGIC PIO: " fmt
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#include <linux/of.h>
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#include <linux/io.h>
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#include <linux/logic_pio.h>
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#include <linux/mm.h>
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#include <linux/rculist.h>
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#include <linux/sizes.h>
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#include <linux/slab.h>
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/* The unique hardware address list */
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static LIST_HEAD(io_range_list);
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static DEFINE_MUTEX(io_range_mutex);
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/* Consider a kernel general helper for this */
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#define in_range(b, first, len) ((b) >= (first) && (b) < (first) + (len))
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/**
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* logic_pio_register_range - register logical PIO range for a host
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* @new_range: pointer to the IO range to be registered.
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*
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* Returns 0 on success, the error code in case of failure.
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* If the range already exists, -EEXIST will be returned, which should be
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* considered a success.
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*
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* Register a new IO range node in the IO range list.
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*/
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int logic_pio_register_range(struct logic_pio_hwaddr *new_range)
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{
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struct logic_pio_hwaddr *range;
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resource_size_t start;
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resource_size_t end;
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resource_size_t mmio_end = 0;
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resource_size_t iio_sz = MMIO_UPPER_LIMIT;
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int ret = 0;
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if (!new_range || !new_range->fwnode || !new_range->size ||
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(new_range->flags == LOGIC_PIO_INDIRECT && !new_range->ops))
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return -EINVAL;
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start = new_range->hw_start;
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end = new_range->hw_start + new_range->size;
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mutex_lock(&io_range_mutex);
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list_for_each_entry(range, &io_range_list, list) {
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if (range->fwnode == new_range->fwnode) {
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/* range already there */
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ret = -EEXIST;
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goto end_register;
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}
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if (range->flags == LOGIC_PIO_CPU_MMIO &&
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new_range->flags == LOGIC_PIO_CPU_MMIO) {
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/* for MMIO ranges we need to check for overlap */
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if (start >= range->hw_start + range->size ||
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end < range->hw_start) {
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mmio_end = range->io_start + range->size;
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} else {
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ret = -EFAULT;
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goto end_register;
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}
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} else if (range->flags == LOGIC_PIO_INDIRECT &&
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new_range->flags == LOGIC_PIO_INDIRECT) {
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iio_sz += range->size;
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}
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}
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/* range not registered yet, check for available space */
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if (new_range->flags == LOGIC_PIO_CPU_MMIO) {
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if (mmio_end + new_range->size - 1 > MMIO_UPPER_LIMIT) {
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/* if it's too big check if 64K space can be reserved */
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if (mmio_end + SZ_64K - 1 > MMIO_UPPER_LIMIT) {
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ret = -E2BIG;
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goto end_register;
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}
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new_range->size = SZ_64K;
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pr_warn("Requested IO range too big, new size set to 64K\n");
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}
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new_range->io_start = mmio_end;
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} else if (new_range->flags == LOGIC_PIO_INDIRECT) {
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if (iio_sz + new_range->size - 1 > IO_SPACE_LIMIT) {
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ret = -E2BIG;
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goto end_register;
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}
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new_range->io_start = iio_sz;
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} else {
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/* invalid flag */
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ret = -EINVAL;
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goto end_register;
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}
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list_add_tail_rcu(&new_range->list, &io_range_list);
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end_register:
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mutex_unlock(&io_range_mutex);
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return ret;
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}
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/**
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* logic_pio_unregister_range - unregister a logical PIO range for a host
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* @range: pointer to the IO range which has been already registered.
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*
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* Unregister a previously-registered IO range node.
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*/
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void logic_pio_unregister_range(struct logic_pio_hwaddr *range)
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{
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mutex_lock(&io_range_mutex);
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list_del_rcu(&range->list);
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mutex_unlock(&io_range_mutex);
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synchronize_rcu();
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}
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/**
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* find_io_range_by_fwnode - find logical PIO range for given FW node
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* @fwnode: FW node handle associated with logical PIO range
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*
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* Returns pointer to node on success, NULL otherwise.
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*
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* Traverse the io_range_list to find the registered node for @fwnode.
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*/
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struct logic_pio_hwaddr *find_io_range_by_fwnode(struct fwnode_handle *fwnode)
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{
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struct logic_pio_hwaddr *range, *found_range = NULL;
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rcu_read_lock();
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list_for_each_entry_rcu(range, &io_range_list, list) {
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if (range->fwnode == fwnode) {
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found_range = range;
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break;
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}
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}
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rcu_read_unlock();
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return found_range;
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}
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/* Return a registered range given an input PIO token */
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static struct logic_pio_hwaddr *find_io_range(unsigned long pio)
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{
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struct logic_pio_hwaddr *range, *found_range = NULL;
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rcu_read_lock();
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list_for_each_entry_rcu(range, &io_range_list, list) {
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if (in_range(pio, range->io_start, range->size)) {
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found_range = range;
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break;
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}
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}
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rcu_read_unlock();
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if (!found_range)
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pr_err("PIO entry token 0x%lx invalid\n", pio);
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return found_range;
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}
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/**
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* logic_pio_to_hwaddr - translate logical PIO to HW address
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* @pio: logical PIO value
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*
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* Returns HW address if valid, ~0 otherwise.
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*
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* Translate the input logical PIO to the corresponding hardware address.
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* The input PIO should be unique in the whole logical PIO space.
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*/
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resource_size_t logic_pio_to_hwaddr(unsigned long pio)
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{
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struct logic_pio_hwaddr *range;
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range = find_io_range(pio);
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if (range)
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return range->hw_start + pio - range->io_start;
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return (resource_size_t)~0;
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}
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/**
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* logic_pio_trans_hwaddr - translate HW address to logical PIO
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* @fwnode: FW node reference for the host
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* @addr: Host-relative HW address
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* @size: size to translate
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*
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* Returns Logical PIO value if successful, ~0UL otherwise
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*/
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unsigned long logic_pio_trans_hwaddr(struct fwnode_handle *fwnode,
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resource_size_t addr, resource_size_t size)
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{
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struct logic_pio_hwaddr *range;
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range = find_io_range_by_fwnode(fwnode);
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if (!range || range->flags == LOGIC_PIO_CPU_MMIO) {
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pr_err("IO range not found or invalid\n");
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return ~0UL;
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}
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if (range->size < size) {
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pr_err("resource size %pa cannot fit in IO range size %pa\n",
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&size, &range->size);
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return ~0UL;
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}
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return addr - range->hw_start + range->io_start;
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}
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unsigned long logic_pio_trans_cpuaddr(resource_size_t addr)
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{
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struct logic_pio_hwaddr *range;
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rcu_read_lock();
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list_for_each_entry_rcu(range, &io_range_list, list) {
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if (range->flags != LOGIC_PIO_CPU_MMIO)
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continue;
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if (in_range(addr, range->hw_start, range->size)) {
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unsigned long cpuaddr;
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cpuaddr = addr - range->hw_start + range->io_start;
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rcu_read_unlock();
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return cpuaddr;
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}
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}
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rcu_read_unlock();
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pr_err("addr %pa not registered in io_range_list\n", &addr);
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return ~0UL;
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}
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#if defined(CONFIG_INDIRECT_PIO) && defined(PCI_IOBASE)
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#define BUILD_LOGIC_IO(bwl, type) \
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type logic_in##bwl(unsigned long addr) \
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{ \
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type ret = (type)~0; \
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\
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if (addr < MMIO_UPPER_LIMIT) { \
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ret = _in##bwl(addr); \
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} else if (addr >= MMIO_UPPER_LIMIT && addr < IO_SPACE_LIMIT) { \
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struct logic_pio_hwaddr *entry = find_io_range(addr); \
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\
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if (entry) \
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ret = entry->ops->in(entry->hostdata, \
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addr, sizeof(type)); \
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else \
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WARN_ON_ONCE(1); \
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} \
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return ret; \
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} \
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\
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void logic_out##bwl(type value, unsigned long addr) \
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{ \
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if (addr < MMIO_UPPER_LIMIT) { \
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_out##bwl(value, addr); \
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} else if (addr >= MMIO_UPPER_LIMIT && addr < IO_SPACE_LIMIT) { \
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struct logic_pio_hwaddr *entry = find_io_range(addr); \
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\
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if (entry) \
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entry->ops->out(entry->hostdata, \
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addr, value, sizeof(type)); \
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else \
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WARN_ON_ONCE(1); \
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} \
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} \
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\
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void logic_ins##bwl(unsigned long addr, void *buffer, \
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unsigned int count) \
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{ \
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if (addr < MMIO_UPPER_LIMIT) { \
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reads##bwl(PCI_IOBASE + addr, buffer, count); \
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} else if (addr >= MMIO_UPPER_LIMIT && addr < IO_SPACE_LIMIT) { \
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struct logic_pio_hwaddr *entry = find_io_range(addr); \
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\
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if (entry) \
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entry->ops->ins(entry->hostdata, \
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addr, buffer, sizeof(type), count); \
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else \
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WARN_ON_ONCE(1); \
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} \
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\
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} \
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\
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void logic_outs##bwl(unsigned long addr, const void *buffer, \
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unsigned int count) \
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{ \
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if (addr < MMIO_UPPER_LIMIT) { \
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writes##bwl(PCI_IOBASE + addr, buffer, count); \
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} else if (addr >= MMIO_UPPER_LIMIT && addr < IO_SPACE_LIMIT) { \
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struct logic_pio_hwaddr *entry = find_io_range(addr); \
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\
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if (entry) \
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entry->ops->outs(entry->hostdata, \
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addr, buffer, sizeof(type), count); \
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else \
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WARN_ON_ONCE(1); \
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} \
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}
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BUILD_LOGIC_IO(b, u8)
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EXPORT_SYMBOL(logic_inb);
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EXPORT_SYMBOL(logic_insb);
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EXPORT_SYMBOL(logic_outb);
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EXPORT_SYMBOL(logic_outsb);
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BUILD_LOGIC_IO(w, u16)
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EXPORT_SYMBOL(logic_inw);
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EXPORT_SYMBOL(logic_insw);
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EXPORT_SYMBOL(logic_outw);
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EXPORT_SYMBOL(logic_outsw);
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BUILD_LOGIC_IO(l, u32)
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EXPORT_SYMBOL(logic_inl);
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EXPORT_SYMBOL(logic_insl);
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EXPORT_SYMBOL(logic_outl);
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EXPORT_SYMBOL(logic_outsl);
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#endif /* CONFIG_INDIRECT_PIO && PCI_IOBASE */
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