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1// SPDX-License-Identifier: GPL-2.0+2/*3 * Copyright (C) 2017 HiSilicon Limited, All Rights Reserved.4 * Author: Gabriele Paoloni <gabriele.paoloni@huawei.com>5 * Author: Zhichang Yuan <yuanzhichang@hisilicon.com>6 * Author: John Garry <john.garry@huawei.com>7 */8 9#define pr_fmt(fmt) "LOGIC PIO: " fmt10 11#include <linux/of.h>12#include <linux/io.h>13#include <linux/logic_pio.h>14#include <linux/mm.h>15#include <linux/rculist.h>16#include <linux/sizes.h>17#include <linux/slab.h>18 19/* The unique hardware address list */20static LIST_HEAD(io_range_list);21static DEFINE_MUTEX(io_range_mutex);22 23/**24 * logic_pio_register_range - register logical PIO range for a host25 * @new_range: pointer to the IO range to be registered.26 *27 * Returns 0 on success, the error code in case of failure.28 * If the range already exists, -EEXIST will be returned, which should be29 * considered a success.30 *31 * Register a new IO range node in the IO range list.32 */33int logic_pio_register_range(struct logic_pio_hwaddr *new_range)34{35 struct logic_pio_hwaddr *range;36 resource_size_t start;37 resource_size_t end;38 resource_size_t mmio_end = 0;39 resource_size_t iio_sz = MMIO_UPPER_LIMIT;40 int ret = 0;41 42 if (!new_range || !new_range->fwnode || !new_range->size ||43 (new_range->flags == LOGIC_PIO_INDIRECT && !new_range->ops))44 return -EINVAL;45 46 start = new_range->hw_start;47 end = new_range->hw_start + new_range->size;48 49 mutex_lock(&io_range_mutex);50 list_for_each_entry(range, &io_range_list, list) {51 if (range->fwnode == new_range->fwnode) {52 /* range already there */53 ret = -EEXIST;54 goto end_register;55 }56 if (range->flags == LOGIC_PIO_CPU_MMIO &&57 new_range->flags == LOGIC_PIO_CPU_MMIO) {58 /* for MMIO ranges we need to check for overlap */59 if (start >= range->hw_start + range->size ||60 end < range->hw_start) {61 mmio_end = range->io_start + range->size;62 } else {63 ret = -EFAULT;64 goto end_register;65 }66 } else if (range->flags == LOGIC_PIO_INDIRECT &&67 new_range->flags == LOGIC_PIO_INDIRECT) {68 iio_sz += range->size;69 }70 }71 72 /* range not registered yet, check for available space */73 if (new_range->flags == LOGIC_PIO_CPU_MMIO) {74 if (mmio_end + new_range->size - 1 > MMIO_UPPER_LIMIT) {75 /* if it's too big check if 64K space can be reserved */76 if (mmio_end + SZ_64K - 1 > MMIO_UPPER_LIMIT) {77 ret = -E2BIG;78 goto end_register;79 }80 new_range->size = SZ_64K;81 pr_warn("Requested IO range too big, new size set to 64K\n");82 }83 new_range->io_start = mmio_end;84 } else if (new_range->flags == LOGIC_PIO_INDIRECT) {85 if (iio_sz + new_range->size - 1 > IO_SPACE_LIMIT) {86 ret = -E2BIG;87 goto end_register;88 }89 new_range->io_start = iio_sz;90 } else {91 /* invalid flag */92 ret = -EINVAL;93 goto end_register;94 }95 96 list_add_tail_rcu(&new_range->list, &io_range_list);97 98end_register:99 mutex_unlock(&io_range_mutex);100 return ret;101}102 103/**104 * logic_pio_unregister_range - unregister a logical PIO range for a host105 * @range: pointer to the IO range which has been already registered.106 *107 * Unregister a previously-registered IO range node.108 */109void logic_pio_unregister_range(struct logic_pio_hwaddr *range)110{111 mutex_lock(&io_range_mutex);112 list_del_rcu(&range->list);113 mutex_unlock(&io_range_mutex);114 synchronize_rcu();115}116 117/**118 * find_io_range_by_fwnode - find logical PIO range for given FW node119 * @fwnode: FW node handle associated with logical PIO range120 *121 * Returns pointer to node on success, NULL otherwise.122 *123 * Traverse the io_range_list to find the registered node for @fwnode.124 */125struct logic_pio_hwaddr *find_io_range_by_fwnode(struct fwnode_handle *fwnode)126{127 struct logic_pio_hwaddr *range, *found_range = NULL;128 129 rcu_read_lock();130 list_for_each_entry_rcu(range, &io_range_list, list) {131 if (range->fwnode == fwnode) {132 found_range = range;133 break;134 }135 }136 rcu_read_unlock();137 138 return found_range;139}140 141/* Return a registered range given an input PIO token */142static struct logic_pio_hwaddr *find_io_range(unsigned long pio)143{144 struct logic_pio_hwaddr *range, *found_range = NULL;145 146 rcu_read_lock();147 list_for_each_entry_rcu(range, &io_range_list, list) {148 if (in_range(pio, range->io_start, range->size)) {149 found_range = range;150 break;151 }152 }153 rcu_read_unlock();154 155 if (!found_range)156 pr_err("PIO entry token 0x%lx invalid\n", pio);157 158 return found_range;159}160 161/**162 * logic_pio_to_hwaddr - translate logical PIO to HW address163 * @pio: logical PIO value164 *165 * Returns HW address if valid, ~0 otherwise.166 *167 * Translate the input logical PIO to the corresponding hardware address.168 * The input PIO should be unique in the whole logical PIO space.169 */170resource_size_t logic_pio_to_hwaddr(unsigned long pio)171{172 struct logic_pio_hwaddr *range;173 174 range = find_io_range(pio);175 if (range)176 return range->hw_start + pio - range->io_start;177 178 return (resource_size_t)~0;179}180 181/**182 * logic_pio_trans_hwaddr - translate HW address to logical PIO183 * @fwnode: FW node reference for the host184 * @addr: Host-relative HW address185 * @size: size to translate186 *187 * Returns Logical PIO value if successful, ~0UL otherwise188 */189unsigned long logic_pio_trans_hwaddr(struct fwnode_handle *fwnode,190 resource_size_t addr, resource_size_t size)191{192 struct logic_pio_hwaddr *range;193 194 range = find_io_range_by_fwnode(fwnode);195 if (!range || range->flags == LOGIC_PIO_CPU_MMIO) {196 pr_err("IO range not found or invalid\n");197 return ~0UL;198 }199 if (range->size < size) {200 pr_err("resource size %pa cannot fit in IO range size %pa\n",201 &size, &range->size);202 return ~0UL;203 }204 return addr - range->hw_start + range->io_start;205}206 207unsigned long logic_pio_trans_cpuaddr(resource_size_t addr)208{209 struct logic_pio_hwaddr *range;210 211 rcu_read_lock();212 list_for_each_entry_rcu(range, &io_range_list, list) {213 if (range->flags != LOGIC_PIO_CPU_MMIO)214 continue;215 if (in_range(addr, range->hw_start, range->size)) {216 unsigned long cpuaddr;217 218 cpuaddr = addr - range->hw_start + range->io_start;219 220 rcu_read_unlock();221 return cpuaddr;222 }223 }224 rcu_read_unlock();225 226 pr_err("addr %pa not registered in io_range_list\n", &addr);227 228 return ~0UL;229}230 231#if defined(CONFIG_INDIRECT_PIO) && defined(PCI_IOBASE)232#define BUILD_LOGIC_IO(bwl, type) \233type logic_in##bwl(unsigned long addr) \234{ \235 type ret = (type)~0; \236 \237 if (addr < MMIO_UPPER_LIMIT) { \238 ret = _in##bwl(addr); \239 } else if (addr >= MMIO_UPPER_LIMIT && addr < IO_SPACE_LIMIT) { \240 struct logic_pio_hwaddr *entry = find_io_range(addr); \241 \242 if (entry) \243 ret = entry->ops->in(entry->hostdata, \244 addr, sizeof(type)); \245 else \246 WARN_ON_ONCE(1); \247 } \248 return ret; \249} \250 \251void logic_out##bwl(type value, unsigned long addr) \252{ \253 if (addr < MMIO_UPPER_LIMIT) { \254 _out##bwl(value, addr); \255 } else if (addr >= MMIO_UPPER_LIMIT && addr < IO_SPACE_LIMIT) { \256 struct logic_pio_hwaddr *entry = find_io_range(addr); \257 \258 if (entry) \259 entry->ops->out(entry->hostdata, \260 addr, value, sizeof(type)); \261 else \262 WARN_ON_ONCE(1); \263 } \264} \265 \266void logic_ins##bwl(unsigned long addr, void *buffer, \267 unsigned int count) \268{ \269 if (addr < MMIO_UPPER_LIMIT) { \270 reads##bwl(PCI_IOBASE + addr, buffer, count); \271 } else if (addr >= MMIO_UPPER_LIMIT && addr < IO_SPACE_LIMIT) { \272 struct logic_pio_hwaddr *entry = find_io_range(addr); \273 \274 if (entry) \275 entry->ops->ins(entry->hostdata, \276 addr, buffer, sizeof(type), count); \277 else \278 WARN_ON_ONCE(1); \279 } \280 \281} \282 \283void logic_outs##bwl(unsigned long addr, const void *buffer, \284 unsigned int count) \285{ \286 if (addr < MMIO_UPPER_LIMIT) { \287 writes##bwl(PCI_IOBASE + addr, buffer, count); \288 } else if (addr >= MMIO_UPPER_LIMIT && addr < IO_SPACE_LIMIT) { \289 struct logic_pio_hwaddr *entry = find_io_range(addr); \290 \291 if (entry) \292 entry->ops->outs(entry->hostdata, \293 addr, buffer, sizeof(type), count); \294 else \295 WARN_ON_ONCE(1); \296 } \297}298 299BUILD_LOGIC_IO(b, u8)300EXPORT_SYMBOL(logic_inb);301EXPORT_SYMBOL(logic_insb);302EXPORT_SYMBOL(logic_outb);303EXPORT_SYMBOL(logic_outsb);304 305BUILD_LOGIC_IO(w, u16)306EXPORT_SYMBOL(logic_inw);307EXPORT_SYMBOL(logic_insw);308EXPORT_SYMBOL(logic_outw);309EXPORT_SYMBOL(logic_outsw);310 311BUILD_LOGIC_IO(l, u32)312EXPORT_SYMBOL(logic_inl);313EXPORT_SYMBOL(logic_insl);314EXPORT_SYMBOL(logic_outl);315EXPORT_SYMBOL(logic_outsl);316 317#endif /* CONFIG_INDIRECT_PIO && PCI_IOBASE */318