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git.proxmox.com Git - mirror_ubuntu-bionic-kernel.git/blob - lib/logic_pio.c
1 // SPDX-License-Identifier: GPL-2.0+
3 * Copyright (C) 2017 HiSilicon Limited, All Rights Reserved.
4 * Author: Gabriele Paoloni <gabriele.paoloni@huawei.com>
5 * Author: Zhichang Yuan <yuanzhichang@hisilicon.com>
8 #define pr_fmt(fmt) "LOGIC PIO: " fmt
12 #include <linux/logic_pio.h>
14 #include <linux/rculist.h>
15 #include <linux/sizes.h>
16 #include <linux/slab.h>
18 /* The unique hardware address list */
19 static LIST_HEAD(io_range_list
);
20 static DEFINE_MUTEX(io_range_mutex
);
22 /* Consider a kernel general helper for this */
23 #define in_range(b, first, len) ((b) >= (first) && (b) < (first) + (len))
26 * logic_pio_register_range - register logical PIO range for a host
27 * @new_range: pointer to the IO range to be registered.
29 * Returns 0 on success, the error code in case of failure.
31 * Register a new IO range node in the IO range list.
33 int logic_pio_register_range(struct logic_pio_hwaddr
*new_range
)
35 struct logic_pio_hwaddr
*range
;
36 resource_size_t start
;
38 resource_size_t mmio_end
= 0;
39 resource_size_t iio_sz
= MMIO_UPPER_LIMIT
;
42 if (!new_range
|| !new_range
->fwnode
|| !new_range
->size
)
45 start
= new_range
->hw_start
;
46 end
= new_range
->hw_start
+ new_range
->size
;
48 mutex_lock(&io_range_mutex
);
49 list_for_each_entry(range
, &io_range_list
, list
) {
50 if (range
->fwnode
== new_range
->fwnode
) {
51 /* range already there */
54 if (range
->flags
== LOGIC_PIO_CPU_MMIO
&&
55 new_range
->flags
== LOGIC_PIO_CPU_MMIO
) {
56 /* for MMIO ranges we need to check for overlap */
57 if (start
>= range
->hw_start
+ range
->size
||
58 end
< range
->hw_start
) {
59 mmio_end
= range
->io_start
+ range
->size
;
64 } else if (range
->flags
== LOGIC_PIO_INDIRECT
&&
65 new_range
->flags
== LOGIC_PIO_INDIRECT
) {
66 iio_sz
+= range
->size
;
70 /* range not registered yet, check for available space */
71 if (new_range
->flags
== LOGIC_PIO_CPU_MMIO
) {
72 if (mmio_end
+ new_range
->size
- 1 > MMIO_UPPER_LIMIT
) {
73 /* if it's too big check if 64K space can be reserved */
74 if (mmio_end
+ SZ_64K
- 1 > MMIO_UPPER_LIMIT
) {
78 new_range
->size
= SZ_64K
;
79 pr_warn("Requested IO range too big, new size set to 64K\n");
81 new_range
->io_start
= mmio_end
;
82 } else if (new_range
->flags
== LOGIC_PIO_INDIRECT
) {
83 if (iio_sz
+ new_range
->size
- 1 > IO_SPACE_LIMIT
) {
87 new_range
->io_start
= iio_sz
;
94 list_add_tail_rcu(&new_range
->list
, &io_range_list
);
97 mutex_unlock(&io_range_mutex
);
102 * find_io_range_by_fwnode - find logical PIO range for given FW node
103 * @fwnode: FW node handle associated with logical PIO range
105 * Returns pointer to node on success, NULL otherwise.
107 * Traverse the io_range_list to find the registered node for @fwnode.
109 struct logic_pio_hwaddr
*find_io_range_by_fwnode(struct fwnode_handle
*fwnode
)
111 struct logic_pio_hwaddr
*range
, *found_range
= NULL
;
114 list_for_each_entry_rcu(range
, &io_range_list
, list
) {
115 if (range
->fwnode
== fwnode
) {
125 /* Return a registered range given an input PIO token */
126 static struct logic_pio_hwaddr
*find_io_range(unsigned long pio
)
128 struct logic_pio_hwaddr
*range
, *found_range
= NULL
;
131 list_for_each_entry_rcu(range
, &io_range_list
, list
) {
132 if (in_range(pio
, range
->io_start
, range
->size
)) {
140 pr_err("PIO entry token 0x%lx invalid\n", pio
);
146 * logic_pio_to_hwaddr - translate logical PIO to HW address
147 * @pio: logical PIO value
149 * Returns HW address if valid, ~0 otherwise.
151 * Translate the input logical PIO to the corresponding hardware address.
152 * The input PIO should be unique in the whole logical PIO space.
154 resource_size_t
logic_pio_to_hwaddr(unsigned long pio
)
156 struct logic_pio_hwaddr
*range
;
158 range
= find_io_range(pio
);
160 return range
->hw_start
+ pio
- range
->io_start
;
162 return (resource_size_t
)~0;
166 * logic_pio_trans_hwaddr - translate HW address to logical PIO
167 * @fwnode: FW node reference for the host
168 * @addr: Host-relative HW address
169 * @size: size to translate
171 * Returns Logical PIO value if successful, ~0UL otherwise
173 unsigned long logic_pio_trans_hwaddr(struct fwnode_handle
*fwnode
,
174 resource_size_t addr
, resource_size_t size
)
176 struct logic_pio_hwaddr
*range
;
178 range
= find_io_range_by_fwnode(fwnode
);
179 if (!range
|| range
->flags
== LOGIC_PIO_CPU_MMIO
) {
180 pr_err("IO range not found or invalid\n");
183 if (range
->size
< size
) {
184 pr_err("resource size %pa cannot fit in IO range size %pa\n",
185 &size
, &range
->size
);
188 return addr
- range
->hw_start
+ range
->io_start
;
191 unsigned long logic_pio_trans_cpuaddr(resource_size_t addr
)
193 struct logic_pio_hwaddr
*range
;
196 list_for_each_entry_rcu(range
, &io_range_list
, list
) {
197 if (range
->flags
!= LOGIC_PIO_CPU_MMIO
)
199 if (in_range(addr
, range
->hw_start
, range
->size
)) {
200 unsigned long cpuaddr
;
202 cpuaddr
= addr
- range
->hw_start
+ range
->io_start
;
210 pr_err("addr %pa not registered in io_range_list\n", &addr
);
215 #if defined(CONFIG_INDIRECT_PIO) && defined(PCI_IOBASE)
216 #define BUILD_LOGIC_IO(bw, type) \
217 type logic_in##bw(unsigned long addr) \
219 type ret = (type)~0; \
221 if (addr < MMIO_UPPER_LIMIT) { \
222 ret = read##bw(PCI_IOBASE + addr); \
223 } else if (addr >= MMIO_UPPER_LIMIT && addr < IO_SPACE_LIMIT) { \
224 struct logic_pio_hwaddr *entry = find_io_range(addr); \
226 if (entry && entry->ops) \
227 ret = entry->ops->in(entry->hostdata, \
228 addr, sizeof(type)); \
235 void logic_out##bw(type value, unsigned long addr) \
237 if (addr < MMIO_UPPER_LIMIT) { \
238 write##bw(value, PCI_IOBASE + addr); \
239 } else if (addr >= MMIO_UPPER_LIMIT && addr < IO_SPACE_LIMIT) { \
240 struct logic_pio_hwaddr *entry = find_io_range(addr); \
242 if (entry && entry->ops) \
243 entry->ops->out(entry->hostdata, \
244 addr, value, sizeof(type)); \
250 void logic_ins##bw(unsigned long addr, void *buffer, \
251 unsigned int count) \
253 if (addr < MMIO_UPPER_LIMIT) { \
254 reads##bw(PCI_IOBASE + addr, buffer, count); \
255 } else if (addr >= MMIO_UPPER_LIMIT && addr < IO_SPACE_LIMIT) { \
256 struct logic_pio_hwaddr *entry = find_io_range(addr); \
258 if (entry && entry->ops) \
259 entry->ops->ins(entry->hostdata, \
260 addr, buffer, sizeof(type), count); \
267 void logic_outs##bw(unsigned long addr, const void *buffer, \
268 unsigned int count) \
270 if (addr < MMIO_UPPER_LIMIT) { \
271 writes##bw(PCI_IOBASE + addr, buffer, count); \
272 } else if (addr >= MMIO_UPPER_LIMIT && addr < IO_SPACE_LIMIT) { \
273 struct logic_pio_hwaddr *entry = find_io_range(addr); \
275 if (entry && entry->ops) \
276 entry->ops->outs(entry->hostdata, \
277 addr, buffer, sizeof(type), count); \
283 BUILD_LOGIC_IO(b
, u8
)
284 EXPORT_SYMBOL(logic_inb
);
285 EXPORT_SYMBOL(logic_insb
);
286 EXPORT_SYMBOL(logic_outb
);
287 EXPORT_SYMBOL(logic_outsb
);
289 BUILD_LOGIC_IO(w
, u16
)
290 EXPORT_SYMBOL(logic_inw
);
291 EXPORT_SYMBOL(logic_insw
);
292 EXPORT_SYMBOL(logic_outw
);
293 EXPORT_SYMBOL(logic_outsw
);
295 BUILD_LOGIC_IO(l
, u32
)
296 EXPORT_SYMBOL(logic_inl
);
297 EXPORT_SYMBOL(logic_insl
);
298 EXPORT_SYMBOL(logic_outl
);
299 EXPORT_SYMBOL(logic_outsl
);
301 #endif /* CONFIG_INDIRECT_PIO && PCI_IOBASE */