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031e3601 ZY |
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 | */ | |
7 | ||
8 | #define pr_fmt(fmt) "LOGIC PIO: " fmt | |
9 | ||
10 | #include <linux/of.h> | |
11 | #include <linux/io.h> | |
12 | #include <linux/logic_pio.h> | |
13 | #include <linux/mm.h> | |
14 | #include <linux/rculist.h> | |
15 | #include <linux/sizes.h> | |
16 | #include <linux/slab.h> | |
17 | ||
18 | /* The unique hardware address list */ | |
19 | static LIST_HEAD(io_range_list); | |
20 | static DEFINE_MUTEX(io_range_mutex); | |
21 | ||
22 | /* Consider a kernel general helper for this */ | |
23 | #define in_range(b, first, len) ((b) >= (first) && (b) < (first) + (len)) | |
24 | ||
25 | /** | |
26 | * logic_pio_register_range - register logical PIO range for a host | |
27 | * @new_range: pointer to the IO range to be registered. | |
28 | * | |
29 | * Returns 0 on success, the error code in case of failure. | |
30 | * | |
31 | * Register a new IO range node in the IO range list. | |
32 | */ | |
33 | int 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_sz = 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 | return -EINVAL; | |
44 | ||
45 | start = new_range->hw_start; | |
46 | end = new_range->hw_start + new_range->size; | |
47 | ||
48 | mutex_lock(&io_range_mutex); | |
06709e81 | 49 | list_for_each_entry(range, &io_range_list, list) { |
031e3601 ZY |
50 | if (range->fwnode == new_range->fwnode) { |
51 | /* range already there */ | |
52 | goto end_register; | |
53 | } | |
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; | |
60 | } else { | |
61 | ret = -EFAULT; | |
62 | goto end_register; | |
63 | } | |
64 | } else if (range->flags == LOGIC_PIO_INDIRECT && | |
65 | new_range->flags == LOGIC_PIO_INDIRECT) { | |
66 | iio_sz += range->size; | |
67 | } | |
68 | } | |
69 | ||
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) { | |
75 | ret = -E2BIG; | |
76 | goto end_register; | |
77 | } | |
78 | new_range->size = SZ_64K; | |
79 | pr_warn("Requested IO range too big, new size set to 64K\n"); | |
80 | } | |
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) { | |
84 | ret = -E2BIG; | |
85 | goto end_register; | |
86 | } | |
87 | new_range->io_start = iio_sz; | |
88 | } else { | |
89 | /* invalid flag */ | |
90 | ret = -EINVAL; | |
91 | goto end_register; | |
92 | } | |
93 | ||
94 | list_add_tail_rcu(&new_range->list, &io_range_list); | |
95 | ||
96 | end_register: | |
97 | mutex_unlock(&io_range_mutex); | |
98 | return ret; | |
99 | } | |
100 | ||
101 | /** | |
102 | * find_io_range_by_fwnode - find logical PIO range for given FW node | |
103 | * @fwnode: FW node handle associated with logical PIO range | |
104 | * | |
105 | * Returns pointer to node on success, NULL otherwise. | |
106 | * | |
107 | * Traverse the io_range_list to find the registered node for @fwnode. | |
108 | */ | |
109 | struct logic_pio_hwaddr *find_io_range_by_fwnode(struct fwnode_handle *fwnode) | |
110 | { | |
06709e81 | 111 | struct logic_pio_hwaddr *range, *found_range = NULL; |
031e3601 | 112 | |
06709e81 | 113 | rcu_read_lock(); |
031e3601 | 114 | list_for_each_entry_rcu(range, &io_range_list, list) { |
06709e81 JG |
115 | if (range->fwnode == fwnode) { |
116 | found_range = range; | |
117 | break; | |
118 | } | |
031e3601 | 119 | } |
06709e81 JG |
120 | rcu_read_unlock(); |
121 | ||
122 | return found_range; | |
031e3601 ZY |
123 | } |
124 | ||
125 | /* Return a registered range given an input PIO token */ | |
126 | static struct logic_pio_hwaddr *find_io_range(unsigned long pio) | |
127 | { | |
06709e81 | 128 | struct logic_pio_hwaddr *range, *found_range = NULL; |
031e3601 | 129 | |
06709e81 | 130 | rcu_read_lock(); |
031e3601 | 131 | list_for_each_entry_rcu(range, &io_range_list, list) { |
06709e81 JG |
132 | if (in_range(pio, range->io_start, range->size)) { |
133 | found_range = range; | |
134 | break; | |
135 | } | |
031e3601 | 136 | } |
06709e81 JG |
137 | rcu_read_unlock(); |
138 | ||
139 | if (!found_range) | |
140 | pr_err("PIO entry token 0x%lx invalid\n", pio); | |
141 | ||
142 | return found_range; | |
031e3601 ZY |
143 | } |
144 | ||
145 | /** | |
146 | * logic_pio_to_hwaddr - translate logical PIO to HW address | |
147 | * @pio: logical PIO value | |
148 | * | |
149 | * Returns HW address if valid, ~0 otherwise. | |
150 | * | |
151 | * Translate the input logical PIO to the corresponding hardware address. | |
152 | * The input PIO should be unique in the whole logical PIO space. | |
153 | */ | |
154 | resource_size_t logic_pio_to_hwaddr(unsigned long pio) | |
155 | { | |
156 | struct logic_pio_hwaddr *range; | |
157 | ||
158 | range = find_io_range(pio); | |
159 | if (range) | |
160 | return range->hw_start + pio - range->io_start; | |
161 | ||
162 | return (resource_size_t)~0; | |
163 | } | |
164 | ||
165 | /** | |
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 | |
170 | * | |
171 | * Returns Logical PIO value if successful, ~0UL otherwise | |
172 | */ | |
173 | unsigned long logic_pio_trans_hwaddr(struct fwnode_handle *fwnode, | |
174 | resource_size_t addr, resource_size_t size) | |
175 | { | |
176 | struct logic_pio_hwaddr *range; | |
177 | ||
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"); | |
181 | return ~0UL; | |
182 | } | |
183 | if (range->size < size) { | |
184 | pr_err("resource size %pa cannot fit in IO range size %pa\n", | |
185 | &size, &range->size); | |
186 | return ~0UL; | |
187 | } | |
188 | return addr - range->hw_start + range->io_start; | |
189 | } | |
190 | ||
191 | unsigned long logic_pio_trans_cpuaddr(resource_size_t addr) | |
192 | { | |
193 | struct logic_pio_hwaddr *range; | |
194 | ||
06709e81 | 195 | rcu_read_lock(); |
031e3601 ZY |
196 | list_for_each_entry_rcu(range, &io_range_list, list) { |
197 | if (range->flags != LOGIC_PIO_CPU_MMIO) | |
198 | continue; | |
06709e81 JG |
199 | if (in_range(addr, range->hw_start, range->size)) { |
200 | unsigned long cpuaddr; | |
201 | ||
202 | cpuaddr = addr - range->hw_start + range->io_start; | |
203 | ||
204 | rcu_read_unlock(); | |
205 | return cpuaddr; | |
206 | } | |
031e3601 | 207 | } |
06709e81 JG |
208 | rcu_read_unlock(); |
209 | ||
210 | pr_err("addr %pa not registered in io_range_list\n", &addr); | |
211 | ||
031e3601 ZY |
212 | return ~0UL; |
213 | } | |
214 | ||
215 | #if defined(CONFIG_INDIRECT_PIO) && defined(PCI_IOBASE) | |
216 | #define BUILD_LOGIC_IO(bw, type) \ | |
217 | type logic_in##bw(unsigned long addr) \ | |
218 | { \ | |
219 | type ret = (type)~0; \ | |
220 | \ | |
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); \ | |
225 | \ | |
226 | if (entry && entry->ops) \ | |
227 | ret = entry->ops->in(entry->hostdata, \ | |
228 | addr, sizeof(type)); \ | |
229 | else \ | |
230 | WARN_ON_ONCE(1); \ | |
231 | } \ | |
232 | return ret; \ | |
233 | } \ | |
234 | \ | |
235 | void logic_out##bw(type value, unsigned long addr) \ | |
236 | { \ | |
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); \ | |
241 | \ | |
242 | if (entry && entry->ops) \ | |
243 | entry->ops->out(entry->hostdata, \ | |
244 | addr, value, sizeof(type)); \ | |
245 | else \ | |
246 | WARN_ON_ONCE(1); \ | |
247 | } \ | |
248 | } \ | |
249 | \ | |
250 | void logic_ins##bw(unsigned long addr, void *buffer, \ | |
251 | unsigned int count) \ | |
252 | { \ | |
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); \ | |
257 | \ | |
258 | if (entry && entry->ops) \ | |
259 | entry->ops->ins(entry->hostdata, \ | |
260 | addr, buffer, sizeof(type), count); \ | |
261 | else \ | |
262 | WARN_ON_ONCE(1); \ | |
263 | } \ | |
264 | \ | |
265 | } \ | |
266 | \ | |
267 | void logic_outs##bw(unsigned long addr, const void *buffer, \ | |
268 | unsigned int count) \ | |
269 | { \ | |
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); \ | |
274 | \ | |
275 | if (entry && entry->ops) \ | |
276 | entry->ops->outs(entry->hostdata, \ | |
277 | addr, buffer, sizeof(type), count); \ | |
278 | else \ | |
279 | WARN_ON_ONCE(1); \ | |
280 | } \ | |
281 | } | |
282 | ||
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); | |
288 | ||
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); | |
294 | ||
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); | |
300 | ||
301 | #endif /* CONFIG_INDIRECT_PIO && PCI_IOBASE */ |