1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * IDT RXS Gen.3 Serial RapidIO switch family support
4 *
5 * Copyright 2016 Integrated Device Technology, Inc.
6 */
7
8#include <linux/stat.h>
9#include <linux/module.h>
10#include <linux/rio.h>
11#include <linux/rio_drv.h>
12#include <linux/rio_ids.h>
13#include <linux/delay.h>
14
15#include <asm/page.h>
16#include "../rio.h"
17
18#define RIO_EM_PW_STAT 0x40020
19#define RIO_PW_CTL 0x40204
20#define RIO_PW_CTL_PW_TMR 0xffffff00
21#define RIO_PW_ROUTE 0x40208
22
23#define RIO_EM_DEV_INT_EN 0x40030
24
25#define RIO_PLM_SPx_IMP_SPEC_CTL(x) (0x10100 + (x)*0x100)
26#define RIO_PLM_SPx_IMP_SPEC_CTL_SOFT_RST 0x02000000
27
28#define RIO_PLM_SPx_PW_EN(x) (0x10118 + (x)*0x100)
29#define RIO_PLM_SPx_PW_EN_OK2U 0x40000000
30#define RIO_PLM_SPx_PW_EN_LINIT 0x10000000
31
32#define RIO_BC_L2_Gn_ENTRYx_CSR(n, x) (0x31000 + (n)*0x400 + (x)*0x4)
33#define RIO_SPx_L2_Gn_ENTRYy_CSR(x, n, y) \
34 (0x51000 + (x)*0x2000 + (n)*0x400 + (y)*0x4)
35
36static int
37idtg3_route_add_entry(struct rio_mport *mport, u16 destid, u8 hopcount,
38 u16 table, u16 route_destid, u8 route_port)
39{
40 u32 rval;
41 u32 entry = route_port;
42 int err = 0;
43
44 pr_debug("RIO: %s t=0x%x did_%x to p_%x\n",
45 __func__, table, route_destid, entry);
46
47 if (route_destid > 0xFF)
48 return -EINVAL;
49
50 if (route_port == RIO_INVALID_ROUTE)
51 entry = RIO_RT_ENTRY_DROP_PKT;
52
53 if (table == RIO_GLOBAL_TABLE) {
54 /* Use broadcast register to update all per-port tables */
55 err = rio_mport_write_config_32(port: mport, destid, hopcount,
56 RIO_BC_L2_Gn_ENTRYx_CSR(0, route_destid),
57 data: entry);
58 return err;
59 }
60
61 /*
62 * Verify that specified port/table number is valid
63 */
64 err = rio_mport_read_config_32(port: mport, destid, hopcount,
65 RIO_SWP_INFO_CAR, data: &rval);
66 if (err)
67 return err;
68
69 if (table >= RIO_GET_TOTAL_PORTS(rval))
70 return -EINVAL;
71
72 err = rio_mport_write_config_32(port: mport, destid, hopcount,
73 RIO_SPx_L2_Gn_ENTRYy_CSR(table, 0, route_destid),
74 data: entry);
75 return err;
76}
77
78static int
79idtg3_route_get_entry(struct rio_mport *mport, u16 destid, u8 hopcount,
80 u16 table, u16 route_destid, u8 *route_port)
81{
82 u32 rval;
83 int err;
84
85 if (route_destid > 0xFF)
86 return -EINVAL;
87
88 err = rio_mport_read_config_32(port: mport, destid, hopcount,
89 RIO_SWP_INFO_CAR, data: &rval);
90 if (err)
91 return err;
92
93 /*
94 * This switch device does not have the dedicated global routing table.
95 * It is substituted by reading routing table of the ingress port of
96 * maintenance read requests.
97 */
98 if (table == RIO_GLOBAL_TABLE)
99 table = RIO_GET_PORT_NUM(rval);
100 else if (table >= RIO_GET_TOTAL_PORTS(rval))
101 return -EINVAL;
102
103 err = rio_mport_read_config_32(port: mport, destid, hopcount,
104 RIO_SPx_L2_Gn_ENTRYy_CSR(table, 0, route_destid),
105 data: &rval);
106 if (err)
107 return err;
108
109 if (rval == RIO_RT_ENTRY_DROP_PKT)
110 *route_port = RIO_INVALID_ROUTE;
111 else
112 *route_port = (u8)rval;
113
114 return 0;
115}
116
117static int
118idtg3_route_clr_table(struct rio_mport *mport, u16 destid, u8 hopcount,
119 u16 table)
120{
121 u32 i;
122 u32 rval;
123 int err;
124
125 if (table == RIO_GLOBAL_TABLE) {
126 for (i = 0; i <= 0xff; i++) {
127 err = rio_mport_write_config_32(port: mport, destid, hopcount,
128 RIO_BC_L2_Gn_ENTRYx_CSR(0, i),
129 RIO_RT_ENTRY_DROP_PKT);
130 if (err)
131 break;
132 }
133
134 return err;
135 }
136
137 err = rio_mport_read_config_32(port: mport, destid, hopcount,
138 RIO_SWP_INFO_CAR, data: &rval);
139 if (err)
140 return err;
141
142 if (table >= RIO_GET_TOTAL_PORTS(rval))
143 return -EINVAL;
144
145 for (i = 0; i <= 0xff; i++) {
146 err = rio_mport_write_config_32(port: mport, destid, hopcount,
147 RIO_SPx_L2_Gn_ENTRYy_CSR(table, 0, i),
148 RIO_RT_ENTRY_DROP_PKT);
149 if (err)
150 break;
151 }
152
153 return err;
154}
155
156/*
157 * This routine performs device-specific initialization only.
158 * All standard EM configuration should be performed at upper level.
159 */
160static int
161idtg3_em_init(struct rio_dev *rdev)
162{
163 int i, tmp;
164 u32 rval;
165
166 pr_debug("RIO: %s [%d:%d]\n", __func__, rdev->destid, rdev->hopcount);
167
168 /* Disable assertion of interrupt signal */
169 rio_write_config_32(rdev, RIO_EM_DEV_INT_EN, data: 0);
170
171 /* Disable port-write event notifications during initialization */
172 rio_write_config_32(rdev, offset: rdev->em_efptr + RIO_EM_PW_TX_CTRL,
173 RIO_EM_PW_TX_CTRL_PW_DIS);
174
175 /* Configure Port-Write notifications for hot-swap events */
176 tmp = RIO_GET_TOTAL_PORTS(rdev->swpinfo);
177 for (i = 0; i < tmp; i++) {
178
179 rio_read_config_32(rdev,
180 RIO_DEV_PORT_N_ERR_STS_CSR(rdev, i),
181 data: &rval);
182 if (rval & RIO_PORT_N_ERR_STS_PORT_UA)
183 continue;
184
185 /* Clear events signaled before enabling notification */
186 rio_write_config_32(rdev,
187 offset: rdev->em_efptr + RIO_EM_PN_ERR_DETECT(i), data: 0);
188
189 /* Enable event notifications */
190 rio_write_config_32(rdev,
191 offset: rdev->em_efptr + RIO_EM_PN_ERRRATE_EN(i),
192 RIO_EM_PN_ERRRATE_EN_OK2U | RIO_EM_PN_ERRRATE_EN_U2OK);
193 /* Enable port-write generation on events */
194 rio_write_config_32(rdev, RIO_PLM_SPx_PW_EN(i),
195 RIO_PLM_SPx_PW_EN_OK2U | RIO_PLM_SPx_PW_EN_LINIT);
196
197 }
198
199 /* Set Port-Write destination port */
200 tmp = RIO_GET_PORT_NUM(rdev->swpinfo);
201 rio_write_config_32(rdev, RIO_PW_ROUTE, data: 1 << tmp);
202
203
204 /* Enable sending port-write event notifications */
205 rio_write_config_32(rdev, offset: rdev->em_efptr + RIO_EM_PW_TX_CTRL, data: 0);
206
207 /* set TVAL = ~50us */
208 rio_write_config_32(rdev,
209 offset: rdev->phys_efptr + RIO_PORT_LINKTO_CTL_CSR, data: 0x8e << 8);
210 return 0;
211}
212
213
214/*
215 * idtg3_em_handler - device-specific error handler
216 *
217 * If the link is down (PORT_UNINIT) does nothing - this is considered
218 * as link partner removal from the port.
219 *
220 * If the link is up (PORT_OK) - situation is handled as *new* device insertion.
221 * In this case ERR_STOP bits are cleared by issuing soft reset command to the
222 * reporting port. Inbound and outbound ackIDs are cleared by the reset as well.
223 * This way the port is synchronized with freshly inserted device (assuming it
224 * was reset/powered-up on insertion).
225 *
226 * TODO: This is not sufficient in a situation when a link between two devices
227 * was down and up again (e.g. cable disconnect). For that situation full ackID
228 * realignment process has to be implemented.
229 */
230static int
231idtg3_em_handler(struct rio_dev *rdev, u8 pnum)
232{
233 u32 err_status;
234 u32 rval;
235
236 rio_read_config_32(rdev,
237 RIO_DEV_PORT_N_ERR_STS_CSR(rdev, pnum),
238 data: &err_status);
239
240 /* Do nothing for device/link removal */
241 if (err_status & RIO_PORT_N_ERR_STS_PORT_UNINIT)
242 return 0;
243
244 /* When link is OK we have a device insertion.
245 * Request port soft reset to clear errors if they present.
246 * Inbound and outbound ackIDs will be 0 after reset.
247 */
248 if (err_status & (RIO_PORT_N_ERR_STS_OUT_ES |
249 RIO_PORT_N_ERR_STS_INP_ES)) {
250 rio_read_config_32(rdev, RIO_PLM_SPx_IMP_SPEC_CTL(pnum), data: &rval);
251 rio_write_config_32(rdev, RIO_PLM_SPx_IMP_SPEC_CTL(pnum),
252 data: rval | RIO_PLM_SPx_IMP_SPEC_CTL_SOFT_RST);
253 udelay(10);
254 rio_write_config_32(rdev, RIO_PLM_SPx_IMP_SPEC_CTL(pnum), data: rval);
255 msleep(msecs: 500);
256 }
257
258 return 0;
259}
260
261static struct rio_switch_ops idtg3_switch_ops = {
262 .owner = THIS_MODULE,
263 .add_entry = idtg3_route_add_entry,
264 .get_entry = idtg3_route_get_entry,
265 .clr_table = idtg3_route_clr_table,
266 .em_init = idtg3_em_init,
267 .em_handle = idtg3_em_handler,
268};
269
270static int idtg3_probe(struct rio_dev *rdev, const struct rio_device_id *id)
271{
272 pr_debug("RIO: %s for %s\n", __func__, rio_name(rdev));
273
274 spin_lock(lock: &rdev->rswitch->lock);
275
276 if (rdev->rswitch->ops) {
277 spin_unlock(lock: &rdev->rswitch->lock);
278 return -EINVAL;
279 }
280
281 rdev->rswitch->ops = &idtg3_switch_ops;
282
283 if (rdev->do_enum) {
284 /* Disable hierarchical routing support: Existing fabric
285 * enumeration/discovery process (see rio-scan.c) uses 8-bit
286 * flat destination ID routing only.
287 */
288 rio_write_config_32(rdev, offset: 0x5000 + RIO_BC_RT_CTL_CSR, data: 0);
289 }
290
291 spin_unlock(lock: &rdev->rswitch->lock);
292
293 return 0;
294}
295
296static void idtg3_remove(struct rio_dev *rdev)
297{
298 pr_debug("RIO: %s for %s\n", __func__, rio_name(rdev));
299 spin_lock(lock: &rdev->rswitch->lock);
300 if (rdev->rswitch->ops == &idtg3_switch_ops)
301 rdev->rswitch->ops = NULL;
302 spin_unlock(lock: &rdev->rswitch->lock);
303}
304
305/*
306 * Gen3 switches repeat sending PW messages until a corresponding event flag
307 * is cleared. Use shutdown notification to disable generation of port-write
308 * messages if their destination node is shut down.
309 */
310static void idtg3_shutdown(struct rio_dev *rdev)
311{
312 int i;
313 u32 rval;
314 u16 destid;
315
316 /* Currently the enumerator node acts also as PW handler */
317 if (!rdev->do_enum)
318 return;
319
320 pr_debug("RIO: %s(%s)\n", __func__, rio_name(rdev));
321
322 rio_read_config_32(rdev, RIO_PW_ROUTE, data: &rval);
323 i = RIO_GET_PORT_NUM(rdev->swpinfo);
324
325 /* Check port-write destination port */
326 if (!((1 << i) & rval))
327 return;
328
329 /* Disable sending port-write event notifications if PW destID
330 * matches to one of the enumerator node
331 */
332 rio_read_config_32(rdev, offset: rdev->em_efptr + RIO_EM_PW_TGT_DEVID, data: &rval);
333
334 if (rval & RIO_EM_PW_TGT_DEVID_DEV16)
335 destid = rval >> 16;
336 else
337 destid = ((rval & RIO_EM_PW_TGT_DEVID_D8) >> 16);
338
339 if (rdev->net->hport->host_deviceid == destid) {
340 rio_write_config_32(rdev,
341 offset: rdev->em_efptr + RIO_EM_PW_TX_CTRL, data: 0);
342 pr_debug("RIO: %s(%s) PW transmission disabled\n",
343 __func__, rio_name(rdev));
344 }
345}
346
347static const struct rio_device_id idtg3_id_table[] = {
348 {RIO_DEVICE(RIO_DID_IDTRXS1632, RIO_VID_IDT)},
349 {RIO_DEVICE(RIO_DID_IDTRXS2448, RIO_VID_IDT)},
350 { 0, } /* terminate list */
351};
352
353static struct rio_driver idtg3_driver = {
354 .name = "idt_gen3",
355 .id_table = idtg3_id_table,
356 .probe = idtg3_probe,
357 .remove = idtg3_remove,
358 .shutdown = idtg3_shutdown,
359};
360
361static int __init idtg3_init(void)
362{
363 return rio_register_driver(&idtg3_driver);
364}
365
366static void __exit idtg3_exit(void)
367{
368 pr_debug("RIO: %s\n", __func__);
369 rio_unregister_driver(&idtg3_driver);
370 pr_debug("RIO: %s done\n", __func__);
371}
372
373device_initcall(idtg3_init);
374module_exit(idtg3_exit);
375
376MODULE_DESCRIPTION("IDT RXS Gen.3 Serial RapidIO switch family driver");
377MODULE_AUTHOR("Integrated Device Technology, Inc.");
378MODULE_LICENSE("GPL");
379

source code of linux/drivers/rapidio/switches/idt_gen3.c