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Linux/drivers/tty/hvc/hvc_opal.c

  1 /*
  2  * opal driver interface to hvc_console.c
  3  *
  4  * Copyright 2011 Benjamin Herrenschmidt <benh@kernel.crashing.org>, IBM Corp.
  5  *
  6  * This program is free software; you can redistribute it and/or modify
  7  * it under the terms of the GNU General Public License as published by
  8  * the Free Software Foundation; either version 2 of the License, or
  9  * (at your option) any later version.
 10  *
 11  * This program is distributed in the hope that it will be useful,
 12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
 13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 14  * GNU General Public License for more details.
 15  *
 16  * You should have received a copy of the GNU General Public License
 17  * along with this program; if not, write to the Free Software
 18  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
 19  *
 20  */
 21 
 22 #undef DEBUG
 23 
 24 #include <linux/types.h>
 25 #include <linux/init.h>
 26 #include <linux/delay.h>
 27 #include <linux/slab.h>
 28 #include <linux/console.h>
 29 #include <linux/of.h>
 30 #include <linux/of_platform.h>
 31 #include <linux/export.h>
 32 #include <linux/interrupt.h>
 33 
 34 #include <asm/hvconsole.h>
 35 #include <asm/prom.h>
 36 #include <asm/firmware.h>
 37 #include <asm/hvsi.h>
 38 #include <asm/udbg.h>
 39 #include <asm/opal.h>
 40 
 41 #include "hvc_console.h"
 42 
 43 static const char hvc_opal_name[] = "hvc_opal";
 44 
 45 static const struct of_device_id hvc_opal_match[] = {
 46         { .name = "serial", .compatible = "ibm,opal-console-raw" },
 47         { .name = "serial", .compatible = "ibm,opal-console-hvsi" },
 48         { },
 49 };
 50 
 51 typedef enum hv_protocol {
 52         HV_PROTOCOL_RAW,
 53         HV_PROTOCOL_HVSI
 54 } hv_protocol_t;
 55 
 56 struct hvc_opal_priv {
 57         hv_protocol_t           proto;  /* Raw data or HVSI packets */
 58         struct hvsi_priv        hvsi;   /* HVSI specific data */
 59 };
 60 static struct hvc_opal_priv *hvc_opal_privs[MAX_NR_HVC_CONSOLES];
 61 
 62 /* For early boot console */
 63 static struct hvc_opal_priv hvc_opal_boot_priv;
 64 static u32 hvc_opal_boot_termno;
 65 
 66 static const struct hv_ops hvc_opal_raw_ops = {
 67         .get_chars = opal_get_chars,
 68         .put_chars = opal_put_chars,
 69         .notifier_add = notifier_add_irq,
 70         .notifier_del = notifier_del_irq,
 71         .notifier_hangup = notifier_hangup_irq,
 72 };
 73 
 74 static int hvc_opal_hvsi_get_chars(uint32_t vtermno, char *buf, int count)
 75 {
 76         struct hvc_opal_priv *pv = hvc_opal_privs[vtermno];
 77 
 78         if (WARN_ON(!pv))
 79                 return -ENODEV;
 80 
 81         return hvsilib_get_chars(&pv->hvsi, buf, count);
 82 }
 83 
 84 static int hvc_opal_hvsi_put_chars(uint32_t vtermno, const char *buf, int count)
 85 {
 86         struct hvc_opal_priv *pv = hvc_opal_privs[vtermno];
 87 
 88         if (WARN_ON(!pv))
 89                 return -ENODEV;
 90 
 91         return hvsilib_put_chars(&pv->hvsi, buf, count);
 92 }
 93 
 94 static int hvc_opal_hvsi_open(struct hvc_struct *hp, int data)
 95 {
 96         struct hvc_opal_priv *pv = hvc_opal_privs[hp->vtermno];
 97         int rc;
 98 
 99         pr_devel("HVSI@%x: do open !\n", hp->vtermno);
100 
101         rc = notifier_add_irq(hp, data);
102         if (rc)
103                 return rc;
104 
105         return hvsilib_open(&pv->hvsi, hp);
106 }
107 
108 static void hvc_opal_hvsi_close(struct hvc_struct *hp, int data)
109 {
110         struct hvc_opal_priv *pv = hvc_opal_privs[hp->vtermno];
111 
112         pr_devel("HVSI@%x: do close !\n", hp->vtermno);
113 
114         hvsilib_close(&pv->hvsi, hp);
115 
116         notifier_del_irq(hp, data);
117 }
118 
119 void hvc_opal_hvsi_hangup(struct hvc_struct *hp, int data)
120 {
121         struct hvc_opal_priv *pv = hvc_opal_privs[hp->vtermno];
122 
123         pr_devel("HVSI@%x: do hangup !\n", hp->vtermno);
124 
125         hvsilib_close(&pv->hvsi, hp);
126 
127         notifier_hangup_irq(hp, data);
128 }
129 
130 static int hvc_opal_hvsi_tiocmget(struct hvc_struct *hp)
131 {
132         struct hvc_opal_priv *pv = hvc_opal_privs[hp->vtermno];
133 
134         if (!pv)
135                 return -EINVAL;
136         return pv->hvsi.mctrl;
137 }
138 
139 static int hvc_opal_hvsi_tiocmset(struct hvc_struct *hp, unsigned int set,
140                                 unsigned int clear)
141 {
142         struct hvc_opal_priv *pv = hvc_opal_privs[hp->vtermno];
143 
144         pr_devel("HVSI@%x: Set modem control, set=%x,clr=%x\n",
145                  hp->vtermno, set, clear);
146 
147         if (set & TIOCM_DTR)
148                 hvsilib_write_mctrl(&pv->hvsi, 1);
149         else if (clear & TIOCM_DTR)
150                 hvsilib_write_mctrl(&pv->hvsi, 0);
151 
152         return 0;
153 }
154 
155 static const struct hv_ops hvc_opal_hvsi_ops = {
156         .get_chars = hvc_opal_hvsi_get_chars,
157         .put_chars = hvc_opal_hvsi_put_chars,
158         .notifier_add = hvc_opal_hvsi_open,
159         .notifier_del = hvc_opal_hvsi_close,
160         .notifier_hangup = hvc_opal_hvsi_hangup,
161         .tiocmget = hvc_opal_hvsi_tiocmget,
162         .tiocmset = hvc_opal_hvsi_tiocmset,
163 };
164 
165 static int hvc_opal_probe(struct platform_device *dev)
166 {
167         const struct hv_ops *ops;
168         struct hvc_struct *hp;
169         struct hvc_opal_priv *pv;
170         hv_protocol_t proto;
171         unsigned int termno, irq, boot = 0;
172         const __be32 *reg;
173 
174         if (of_device_is_compatible(dev->dev.of_node, "ibm,opal-console-raw")) {
175                 proto = HV_PROTOCOL_RAW;
176                 ops = &hvc_opal_raw_ops;
177         } else if (of_device_is_compatible(dev->dev.of_node,
178                                            "ibm,opal-console-hvsi")) {
179                 proto = HV_PROTOCOL_HVSI;
180                 ops = &hvc_opal_hvsi_ops;
181         } else {
182                 pr_err("hvc_opal: Unknown protocol for %s\n",
183                        dev->dev.of_node->full_name);
184                 return -ENXIO;
185         }
186 
187         reg = of_get_property(dev->dev.of_node, "reg", NULL);
188         termno = reg ? be32_to_cpup(reg) : 0;
189 
190         /* Is it our boot one ? */
191         if (hvc_opal_privs[termno] == &hvc_opal_boot_priv) {
192                 pv = hvc_opal_privs[termno];
193                 boot = 1;
194         } else if (hvc_opal_privs[termno] == NULL) {
195                 pv = kzalloc(sizeof(struct hvc_opal_priv), GFP_KERNEL);
196                 if (!pv)
197                         return -ENOMEM;
198                 pv->proto = proto;
199                 hvc_opal_privs[termno] = pv;
200                 if (proto == HV_PROTOCOL_HVSI)
201                         hvsilib_init(&pv->hvsi, opal_get_chars, opal_put_chars,
202                                      termno, 0);
203 
204                 /* Instanciate now to establish a mapping index==vtermno */
205                 hvc_instantiate(termno, termno, ops);
206         } else {
207                 pr_err("hvc_opal: Device %s has duplicate terminal number #%d\n",
208                        dev->dev.of_node->full_name, termno);
209                 return -ENXIO;
210         }
211 
212         pr_info("hvc%d: %s protocol on %s%s\n", termno,
213                 proto == HV_PROTOCOL_RAW ? "raw" : "hvsi",
214                 dev->dev.of_node->full_name,
215                 boot ? " (boot console)" : "");
216 
217         irq = irq_of_parse_and_map(dev->dev.of_node, 0);
218         if (!irq) {
219                 pr_info("hvc%d: No interrupts property, using OPAL event\n",
220                                 termno);
221                 irq = opal_event_request(ilog2(OPAL_EVENT_CONSOLE_INPUT));
222         }
223 
224         if (!irq) {
225                 pr_err("hvc_opal: Unable to map interrupt for device %s\n",
226                         dev->dev.of_node->full_name);
227                 return irq;
228         }
229 
230         hp = hvc_alloc(termno, irq, ops, MAX_VIO_PUT_CHARS);
231         if (IS_ERR(hp))
232                 return PTR_ERR(hp);
233 
234         /* hvc consoles on powernv may need to share a single irq */
235         hp->flags = IRQF_SHARED;
236         dev_set_drvdata(&dev->dev, hp);
237 
238         return 0;
239 }
240 
241 static int hvc_opal_remove(struct platform_device *dev)
242 {
243         struct hvc_struct *hp = dev_get_drvdata(&dev->dev);
244         int rc, termno;
245 
246         termno = hp->vtermno;
247         rc = hvc_remove(hp);
248         if (rc == 0) {
249                 if (hvc_opal_privs[termno] != &hvc_opal_boot_priv)
250                         kfree(hvc_opal_privs[termno]);
251                 hvc_opal_privs[termno] = NULL;
252         }
253         return rc;
254 }
255 
256 static struct platform_driver hvc_opal_driver = {
257         .probe          = hvc_opal_probe,
258         .remove         = hvc_opal_remove,
259         .driver         = {
260                 .name   = hvc_opal_name,
261                 .of_match_table = hvc_opal_match,
262         }
263 };
264 
265 static int __init hvc_opal_init(void)
266 {
267         if (!firmware_has_feature(FW_FEATURE_OPAL))
268                 return -ENODEV;
269 
270         /* Register as a vio device to receive callbacks */
271         return platform_driver_register(&hvc_opal_driver);
272 }
273 device_initcall(hvc_opal_init);
274 
275 static void udbg_opal_putc(char c)
276 {
277         unsigned int termno = hvc_opal_boot_termno;
278         int count = -1;
279 
280         if (c == '\n')
281                 udbg_opal_putc('\r');
282 
283         do {
284                 switch(hvc_opal_boot_priv.proto) {
285                 case HV_PROTOCOL_RAW:
286                         count = opal_put_chars(termno, &c, 1);
287                         break;
288                 case HV_PROTOCOL_HVSI:
289                         count = hvc_opal_hvsi_put_chars(termno, &c, 1);
290                         break;
291                 }
292         } while(count == 0 || count == -EAGAIN);
293 }
294 
295 static int udbg_opal_getc_poll(void)
296 {
297         unsigned int termno = hvc_opal_boot_termno;
298         int rc = 0;
299         char c;
300 
301         switch(hvc_opal_boot_priv.proto) {
302         case HV_PROTOCOL_RAW:
303                 rc = opal_get_chars(termno, &c, 1);
304                 break;
305         case HV_PROTOCOL_HVSI:
306                 rc = hvc_opal_hvsi_get_chars(termno, &c, 1);
307                 break;
308         }
309         if (!rc)
310                 return -1;
311         return c;
312 }
313 
314 static int udbg_opal_getc(void)
315 {
316         int ch;
317         for (;;) {
318                 ch = udbg_opal_getc_poll();
319                 if (ch == -1) {
320                         /* This shouldn't be needed...but... */
321                         volatile unsigned long delay;
322                         for (delay=0; delay < 2000000; delay++)
323                                 ;
324                 } else {
325                         return ch;
326                 }
327         }
328 }
329 
330 static void udbg_init_opal_common(void)
331 {
332         udbg_putc = udbg_opal_putc;
333         udbg_getc = udbg_opal_getc;
334         udbg_getc_poll = udbg_opal_getc_poll;
335         tb_ticks_per_usec = 0x200; /* Make udelay not suck */
336 }
337 
338 void __init hvc_opal_init_early(void)
339 {
340         struct device_node *stdout_node = of_node_get(of_stdout);
341         const __be32 *termno;
342         const struct hv_ops *ops;
343         u32 index;
344 
345         /* If the console wasn't in /chosen, try /ibm,opal */
346         if (!stdout_node) {
347                 struct device_node *opal, *np;
348 
349                 /* Current OPAL takeover doesn't provide the stdout
350                  * path, so we hard wire it
351                  */
352                 opal = of_find_node_by_path("/ibm,opal/consoles");
353                 if (opal)
354                         pr_devel("hvc_opal: Found consoles in new location\n");
355                 if (!opal) {
356                         opal = of_find_node_by_path("/ibm,opal");
357                         if (opal)
358                                 pr_devel("hvc_opal: "
359                                          "Found consoles in old location\n");
360                 }
361                 if (!opal)
362                         return;
363                 for_each_child_of_node(opal, np) {
364                         if (!strcmp(np->name, "serial")) {
365                                 stdout_node = np;
366                                 break;
367                         }
368                 }
369                 of_node_put(opal);
370         }
371         if (!stdout_node)
372                 return;
373         termno = of_get_property(stdout_node, "reg", NULL);
374         index = termno ? be32_to_cpup(termno) : 0;
375         if (index >= MAX_NR_HVC_CONSOLES)
376                 return;
377         hvc_opal_privs[index] = &hvc_opal_boot_priv;
378 
379         /* Check the protocol */
380         if (of_device_is_compatible(stdout_node, "ibm,opal-console-raw")) {
381                 hvc_opal_boot_priv.proto = HV_PROTOCOL_RAW;
382                 ops = &hvc_opal_raw_ops;
383                 pr_devel("hvc_opal: Found RAW console\n");
384         }
385         else if (of_device_is_compatible(stdout_node,"ibm,opal-console-hvsi")) {
386                 hvc_opal_boot_priv.proto = HV_PROTOCOL_HVSI;
387                 ops = &hvc_opal_hvsi_ops;
388                 hvsilib_init(&hvc_opal_boot_priv.hvsi, opal_get_chars,
389                              opal_put_chars, index, 1);
390                 /* HVSI, perform the handshake now */
391                 hvsilib_establish(&hvc_opal_boot_priv.hvsi);
392                 pr_devel("hvc_opal: Found HVSI console\n");
393         } else
394                 goto out;
395         hvc_opal_boot_termno = index;
396         udbg_init_opal_common();
397         add_preferred_console("hvc", index, NULL);
398         hvc_instantiate(index, index, ops);
399 out:
400         of_node_put(stdout_node);
401 }
402 
403 #ifdef CONFIG_PPC_EARLY_DEBUG_OPAL_RAW
404 void __init udbg_init_debug_opal_raw(void)
405 {
406         u32 index = CONFIG_PPC_EARLY_DEBUG_OPAL_VTERMNO;
407         hvc_opal_privs[index] = &hvc_opal_boot_priv;
408         hvc_opal_boot_priv.proto = HV_PROTOCOL_RAW;
409         hvc_opal_boot_termno = index;
410         udbg_init_opal_common();
411 }
412 #endif /* CONFIG_PPC_EARLY_DEBUG_OPAL_RAW */
413 
414 #ifdef CONFIG_PPC_EARLY_DEBUG_OPAL_HVSI
415 void __init udbg_init_debug_opal_hvsi(void)
416 {
417         u32 index = CONFIG_PPC_EARLY_DEBUG_OPAL_VTERMNO;
418         hvc_opal_privs[index] = &hvc_opal_boot_priv;
419         hvc_opal_boot_termno = index;
420         udbg_init_opal_common();
421         hvsilib_init(&hvc_opal_boot_priv.hvsi, opal_get_chars, opal_put_chars,
422                      index, 1);
423         hvsilib_establish(&hvc_opal_boot_priv.hvsi);
424 }
425 #endif /* CONFIG_PPC_EARLY_DEBUG_OPAL_HVSI */
426 

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