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git.proxmox.com Git - mirror_ubuntu-jammy-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_sz
= 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_rcu(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_sz
+= 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_sz
+ new_range
->size
- 1 > MMIO_UPPER_LIMIT
) {
73 /* if it's too big check if 64K space can be reserved */
74 if (mmio_sz
+ 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_sz
;
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
;
113 list_for_each_entry_rcu(range
, &io_range_list
, list
) {
114 if (range
->fwnode
== fwnode
)
120 /* Return a registered range given an input PIO token */
121 static struct logic_pio_hwaddr
*find_io_range(unsigned long pio
)
123 struct logic_pio_hwaddr
*range
;
125 list_for_each_entry_rcu(range
, &io_range_list
, list
) {
126 if (in_range(pio
, range
->io_start
, range
->size
))
129 pr_err("PIO entry token %lx invalid\n", pio
);
134 * logic_pio_to_hwaddr - translate logical PIO to HW address
135 * @pio: logical PIO value
137 * Returns HW address if valid, ~0 otherwise.
139 * Translate the input logical PIO to the corresponding hardware address.
140 * The input PIO should be unique in the whole logical PIO space.
142 resource_size_t
logic_pio_to_hwaddr(unsigned long pio
)
144 struct logic_pio_hwaddr
*range
;
146 range
= find_io_range(pio
);
148 return range
->hw_start
+ pio
- range
->io_start
;
150 return (resource_size_t
)~0;
154 * logic_pio_trans_hwaddr - translate HW address to logical PIO
155 * @fwnode: FW node reference for the host
156 * @addr: Host-relative HW address
157 * @size: size to translate
159 * Returns Logical PIO value if successful, ~0UL otherwise
161 unsigned long logic_pio_trans_hwaddr(struct fwnode_handle
*fwnode
,
162 resource_size_t addr
, resource_size_t size
)
164 struct logic_pio_hwaddr
*range
;
166 range
= find_io_range_by_fwnode(fwnode
);
167 if (!range
|| range
->flags
== LOGIC_PIO_CPU_MMIO
) {
168 pr_err("IO range not found or invalid\n");
171 if (range
->size
< size
) {
172 pr_err("resource size %pa cannot fit in IO range size %pa\n",
173 &size
, &range
->size
);
176 return addr
- range
->hw_start
+ range
->io_start
;
179 unsigned long logic_pio_trans_cpuaddr(resource_size_t addr
)
181 struct logic_pio_hwaddr
*range
;
183 list_for_each_entry_rcu(range
, &io_range_list
, list
) {
184 if (range
->flags
!= LOGIC_PIO_CPU_MMIO
)
186 if (in_range(addr
, range
->hw_start
, range
->size
))
187 return addr
- range
->hw_start
+ range
->io_start
;
189 pr_err("addr %llx not registered in io_range_list\n",
190 (unsigned long long) addr
);
194 #if defined(CONFIG_INDIRECT_PIO) && defined(PCI_IOBASE)
195 #define BUILD_LOGIC_IO(bw, type) \
196 type logic_in##bw(unsigned long addr) \
198 type ret = (type)~0; \
200 if (addr < MMIO_UPPER_LIMIT) { \
201 ret = read##bw(PCI_IOBASE + addr); \
202 } else if (addr >= MMIO_UPPER_LIMIT && addr < IO_SPACE_LIMIT) { \
203 struct logic_pio_hwaddr *entry = find_io_range(addr); \
205 if (entry && entry->ops) \
206 ret = entry->ops->in(entry->hostdata, \
207 addr, sizeof(type)); \
214 void logic_out##bw(type value, unsigned long addr) \
216 if (addr < MMIO_UPPER_LIMIT) { \
217 write##bw(value, PCI_IOBASE + addr); \
218 } else if (addr >= MMIO_UPPER_LIMIT && addr < IO_SPACE_LIMIT) { \
219 struct logic_pio_hwaddr *entry = find_io_range(addr); \
221 if (entry && entry->ops) \
222 entry->ops->out(entry->hostdata, \
223 addr, value, sizeof(type)); \
229 void logic_ins##bw(unsigned long addr, void *buffer, \
230 unsigned int count) \
232 if (addr < MMIO_UPPER_LIMIT) { \
233 reads##bw(PCI_IOBASE + addr, buffer, count); \
234 } else if (addr >= MMIO_UPPER_LIMIT && addr < IO_SPACE_LIMIT) { \
235 struct logic_pio_hwaddr *entry = find_io_range(addr); \
237 if (entry && entry->ops) \
238 entry->ops->ins(entry->hostdata, \
239 addr, buffer, sizeof(type), count); \
246 void logic_outs##bw(unsigned long addr, const void *buffer, \
247 unsigned int count) \
249 if (addr < MMIO_UPPER_LIMIT) { \
250 writes##bw(PCI_IOBASE + addr, buffer, count); \
251 } else if (addr >= MMIO_UPPER_LIMIT && addr < IO_SPACE_LIMIT) { \
252 struct logic_pio_hwaddr *entry = find_io_range(addr); \
254 if (entry && entry->ops) \
255 entry->ops->outs(entry->hostdata, \
256 addr, buffer, sizeof(type), count); \
262 BUILD_LOGIC_IO(b
, u8
)
263 EXPORT_SYMBOL(logic_inb
);
264 EXPORT_SYMBOL(logic_insb
);
265 EXPORT_SYMBOL(logic_outb
);
266 EXPORT_SYMBOL(logic_outsb
);
268 BUILD_LOGIC_IO(w
, u16
)
269 EXPORT_SYMBOL(logic_inw
);
270 EXPORT_SYMBOL(logic_insw
);
271 EXPORT_SYMBOL(logic_outw
);
272 EXPORT_SYMBOL(logic_outsw
);
274 BUILD_LOGIC_IO(l
, u32
)
275 EXPORT_SYMBOL(logic_inl
);
276 EXPORT_SYMBOL(logic_insl
);
277 EXPORT_SYMBOL(logic_outl
);
278 EXPORT_SYMBOL(logic_outsl
);
280 #endif /* CONFIG_INDIRECT_PIO && PCI_IOBASE */