1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * Freescale MPC85xx/MPC86xx RapidIO support
5 * Copyright 2009 Sysgo AG
7 * - fixed maintenance access routines, check for aligned access
9 * Copyright 2009 Integrated Device Technology, Inc.
11 * - Added Port-Write message handling
12 * - Added Machine Check exception handling
14 * Copyright (C) 2007, 2008, 2010, 2011 Freescale Semiconductor, Inc.
17 * Copyright 2005 MontaVista Software, Inc.
21 #include <linux/init.h>
22 #include <linux/extable.h>
23 #include <linux/types.h>
24 #include <linux/dma-mapping.h>
25 #include <linux/interrupt.h>
27 #include <linux/of_address.h>
28 #include <linux/of_irq.h>
29 #include <linux/platform_device.h>
30 #include <linux/delay.h>
31 #include <linux/slab.h>
34 #include <linux/uaccess.h>
35 #include <asm/machdep.h>
40 #undef DEBUG_PW /* Port-Write debugging */
42 #define RIO_PORT1_EDCSR 0x0640
43 #define RIO_PORT2_EDCSR 0x0680
44 #define RIO_PORT1_IECSR 0x10130
45 #define RIO_PORT2_IECSR 0x101B0
47 #define RIO_GCCSR 0x13c
48 #define RIO_ESCSR 0x158
49 #define ESCSR_CLEAR 0x07120204
50 #define RIO_PORT2_ESCSR 0x178
51 #define RIO_CCSR 0x15c
52 #define RIO_LTLEDCSR_IER 0x80000000
53 #define RIO_LTLEDCSR_PRT 0x01000000
54 #define IECSR_CLEAR 0x80000000
55 #define RIO_ISR_AACR 0x10120
56 #define RIO_ISR_AACR_AA 0x1 /* Accept All ID */
58 #define RIWTAR_TRAD_VAL_SHIFT 12
59 #define RIWTAR_TRAD_MASK 0x00FFFFFF
60 #define RIWBAR_BADD_VAL_SHIFT 12
61 #define RIWBAR_BADD_MASK 0x003FFFFF
62 #define RIWAR_ENABLE 0x80000000
63 #define RIWAR_TGINT_LOCAL 0x00F00000
64 #define RIWAR_RDTYP_NO_SNOOP 0x00040000
65 #define RIWAR_RDTYP_SNOOP 0x00050000
66 #define RIWAR_WRTYP_NO_SNOOP 0x00004000
67 #define RIWAR_WRTYP_SNOOP 0x00005000
68 #define RIWAR_WRTYP_ALLOC 0x00006000
69 #define RIWAR_SIZE_MASK 0x0000003F
71 static DEFINE_SPINLOCK(fsl_rio_config_lock);
73 #define ___fsl_read_rio_config(x, addr, err, op, barrier) \
74 __asm__ __volatile__( \
75 "1: "op" %1,0(%2)\n" \
78 ".section .fixup,\"ax\"\n" \
84 : "=r" (err), "=r" (x) \
85 : "b" (addr), "i" (-EFAULT), "0" (err))
88 #define __fsl_read_rio_config(x, addr, err, op) \
89 ___fsl_read_rio_config(x, addr, err, op, "mbar")
91 #define __fsl_read_rio_config(x, addr, err, op) \
92 ___fsl_read_rio_config(x, addr, err, op, "eieio")
95 void __iomem *rio_regs_win;
96 void __iomem *rmu_regs_win;
97 resource_size_t rio_law_start;
99 struct fsl_rio_dbell *dbell;
100 struct fsl_rio_pw *pw;
102 #ifdef CONFIG_PPC_E500
103 int fsl_rio_mcheck_exception(struct pt_regs *regs)
105 const struct exception_table_entry *entry;
106 unsigned long reason;
111 reason = in_be32((u32 *)(rio_regs_win + RIO_LTLEDCSR));
112 if (reason & (RIO_LTLEDCSR_IER | RIO_LTLEDCSR_PRT)) {
113 /* Check if we are prepared to handle this fault */
114 entry = search_exception_tables(regs->nip);
116 pr_debug("RIO: %s - MC Exception handled\n",
118 out_be32((u32 *)(rio_regs_win + RIO_LTLEDCSR),
120 regs_set_recoverable(regs);
121 regs_set_return_ip(regs, extable_fixup(entry));
128 EXPORT_SYMBOL_GPL(fsl_rio_mcheck_exception);
132 * fsl_local_config_read - Generate a MPC85xx local config space read
133 * @mport: RapidIO master port info
134 * @index: ID of RapdiIO interface
135 * @offset: Offset into configuration space
136 * @len: Length (in bytes) of the maintenance transaction
137 * @data: Value to be read into
139 * Generates a MPC85xx local configuration space read. Returns %0 on
140 * success or %-EINVAL on failure.
142 static int fsl_local_config_read(struct rio_mport *mport,
143 int index, u32 offset, int len, u32 *data)
145 struct rio_priv *priv = mport->priv;
146 pr_debug("fsl_local_config_read: index %d offset %8.8x\n", index,
148 *data = in_be32(priv->regs_win + offset);
154 * fsl_local_config_write - Generate a MPC85xx local config space write
155 * @mport: RapidIO master port info
156 * @index: ID of RapdiIO interface
157 * @offset: Offset into configuration space
158 * @len: Length (in bytes) of the maintenance transaction
159 * @data: Value to be written
161 * Generates a MPC85xx local configuration space write. Returns %0 on
162 * success or %-EINVAL on failure.
164 static int fsl_local_config_write(struct rio_mport *mport,
165 int index, u32 offset, int len, u32 data)
167 struct rio_priv *priv = mport->priv;
169 ("fsl_local_config_write: index %d offset %8.8x data %8.8x\n",
170 index, offset, data);
171 out_be32(priv->regs_win + offset, data);
177 * fsl_rio_config_read - Generate a MPC85xx read maintenance transaction
178 * @mport: RapidIO master port info
179 * @index: ID of RapdiIO interface
180 * @destid: Destination ID of transaction
181 * @hopcount: Number of hops to target device
182 * @offset: Offset into configuration space
183 * @len: Length (in bytes) of the maintenance transaction
184 * @val: Location to be read into
186 * Generates a MPC85xx read maintenance transaction. Returns %0 on
187 * success or %-EINVAL on failure.
190 fsl_rio_config_read(struct rio_mport *mport, int index, u16 destid,
191 u8 hopcount, u32 offset, int len, u32 *val)
193 struct rio_priv *priv = mport->priv;
199 ("fsl_rio_config_read:"
200 " index %d destid %d hopcount %d offset %8.8x len %d\n",
201 index, destid, hopcount, offset, len);
203 /* 16MB maintenance window possible */
204 /* allow only aligned access to maintenance registers */
205 if (offset > (0x1000000 - len) || !IS_ALIGNED(offset, len))
208 spin_lock_irqsave(&fsl_rio_config_lock, flags);
210 out_be32(&priv->maint_atmu_regs->rowtar,
211 (destid << 22) | (hopcount << 12) | (offset >> 12));
212 out_be32(&priv->maint_atmu_regs->rowtear, (destid >> 10));
214 data = (u8 *) priv->maint_win + (offset & (RIO_MAINT_WIN_SIZE - 1));
217 __fsl_read_rio_config(rval, data, err, "lbz");
220 __fsl_read_rio_config(rval, data, err, "lhz");
223 __fsl_read_rio_config(rval, data, err, "lwz");
226 spin_unlock_irqrestore(&fsl_rio_config_lock, flags);
231 pr_debug("RIO: cfg_read error %d for %x:%x:%x\n",
232 err, destid, hopcount, offset);
235 spin_unlock_irqrestore(&fsl_rio_config_lock, flags);
242 * fsl_rio_config_write - Generate a MPC85xx write maintenance transaction
243 * @mport: RapidIO master port info
244 * @index: ID of RapdiIO interface
245 * @destid: Destination ID of transaction
246 * @hopcount: Number of hops to target device
247 * @offset: Offset into configuration space
248 * @len: Length (in bytes) of the maintenance transaction
249 * @val: Value to be written
251 * Generates an MPC85xx write maintenance transaction. Returns %0 on
252 * success or %-EINVAL on failure.
255 fsl_rio_config_write(struct rio_mport *mport, int index, u16 destid,
256 u8 hopcount, u32 offset, int len, u32 val)
258 struct rio_priv *priv = mport->priv;
264 ("fsl_rio_config_write:"
265 " index %d destid %d hopcount %d offset %8.8x len %d val %8.8x\n",
266 index, destid, hopcount, offset, len, val);
268 /* 16MB maintenance windows possible */
269 /* allow only aligned access to maintenance registers */
270 if (offset > (0x1000000 - len) || !IS_ALIGNED(offset, len))
273 spin_lock_irqsave(&fsl_rio_config_lock, flags);
275 out_be32(&priv->maint_atmu_regs->rowtar,
276 (destid << 22) | (hopcount << 12) | (offset >> 12));
277 out_be32(&priv->maint_atmu_regs->rowtear, (destid >> 10));
279 data = (u8 *) priv->maint_win + (offset & (RIO_MAINT_WIN_SIZE - 1));
282 out_8((u8 *) data, val);
285 out_be16((u16 *) data, val);
288 out_be32((u32 *) data, val);
293 spin_unlock_irqrestore(&fsl_rio_config_lock, flags);
298 static void fsl_rio_inbound_mem_init(struct rio_priv *priv)
302 /* close inbound windows */
303 for (i = 0; i < RIO_INB_ATMU_COUNT; i++)
304 out_be32(&priv->inb_atmu_regs[i].riwar, 0);
307 static int fsl_map_inb_mem(struct rio_mport *mport, dma_addr_t lstart,
308 u64 rstart, u64 size, u32 flags)
310 struct rio_priv *priv = mport->priv;
312 unsigned int base_size_log;
313 u64 win_start, win_end;
317 if ((size & (size - 1)) != 0 || size > 0x400000000ULL)
320 base_size_log = ilog2(size);
321 base_size = 1 << base_size_log;
323 /* check if addresses are aligned with the window size */
324 if (lstart & (base_size - 1))
326 if (rstart & (base_size - 1))
329 /* check for conflicting ranges */
330 for (i = 0; i < RIO_INB_ATMU_COUNT; i++) {
331 riwar = in_be32(&priv->inb_atmu_regs[i].riwar);
332 if ((riwar & RIWAR_ENABLE) == 0)
334 win_start = ((u64)(in_be32(&priv->inb_atmu_regs[i].riwbar) & RIWBAR_BADD_MASK))
335 << RIWBAR_BADD_VAL_SHIFT;
336 win_end = win_start + ((1 << ((riwar & RIWAR_SIZE_MASK) + 1)) - 1);
337 if (rstart < win_end && (rstart + size) > win_start)
341 /* find unused atmu */
342 for (i = 0; i < RIO_INB_ATMU_COUNT; i++) {
343 riwar = in_be32(&priv->inb_atmu_regs[i].riwar);
344 if ((riwar & RIWAR_ENABLE) == 0)
347 if (i >= RIO_INB_ATMU_COUNT)
350 out_be32(&priv->inb_atmu_regs[i].riwtar, lstart >> RIWTAR_TRAD_VAL_SHIFT);
351 out_be32(&priv->inb_atmu_regs[i].riwbar, rstart >> RIWBAR_BADD_VAL_SHIFT);
352 out_be32(&priv->inb_atmu_regs[i].riwar, RIWAR_ENABLE | RIWAR_TGINT_LOCAL |
353 RIWAR_RDTYP_SNOOP | RIWAR_WRTYP_SNOOP | (base_size_log - 1));
358 static void fsl_unmap_inb_mem(struct rio_mport *mport, dma_addr_t lstart)
360 u32 win_start_shift, base_start_shift;
361 struct rio_priv *priv = mport->priv;
365 /* skip default window */
366 base_start_shift = lstart >> RIWTAR_TRAD_VAL_SHIFT;
367 for (i = 0; i < RIO_INB_ATMU_COUNT; i++) {
368 riwar = in_be32(&priv->inb_atmu_regs[i].riwar);
369 if ((riwar & RIWAR_ENABLE) == 0)
372 riwtar = in_be32(&priv->inb_atmu_regs[i].riwtar);
373 win_start_shift = riwtar & RIWTAR_TRAD_MASK;
374 if (win_start_shift == base_start_shift) {
375 out_be32(&priv->inb_atmu_regs[i].riwar, riwar & ~RIWAR_ENABLE);
381 void fsl_rio_port_error_handler(int offset)
383 /*XXX: Error recovery is not implemented, we just clear errors */
384 out_be32((u32 *)(rio_regs_win + RIO_LTLEDCSR), 0);
387 out_be32((u32 *)(rio_regs_win + RIO_PORT1_EDCSR), 0);
388 out_be32((u32 *)(rio_regs_win + RIO_PORT1_IECSR), IECSR_CLEAR);
389 out_be32((u32 *)(rio_regs_win + RIO_ESCSR), ESCSR_CLEAR);
391 out_be32((u32 *)(rio_regs_win + RIO_PORT2_EDCSR), 0);
392 out_be32((u32 *)(rio_regs_win + RIO_PORT2_IECSR), IECSR_CLEAR);
393 out_be32((u32 *)(rio_regs_win + RIO_PORT2_ESCSR), ESCSR_CLEAR);
396 static inline void fsl_rio_info(struct device *dev, u32 ccsr)
401 switch (ccsr >> 30) {
412 dev_info(dev, "Hardware port width: %s\n", str);
414 switch ((ccsr >> 27) & 7) {
416 str = "Single-lane 0";
419 str = "Single-lane 2";
428 dev_info(dev, "Training connection status: %s\n", str);
431 if (!(ccsr & 0x80000000))
432 dev_info(dev, "Output port operating in 8-bit mode\n");
433 if (!(ccsr & 0x08000000))
434 dev_info(dev, "Input port operating in 8-bit mode\n");
439 * fsl_rio_setup - Setup Freescale PowerPC RapidIO interface
440 * @dev: platform_device pointer
442 * Initializes MPC85xx RapidIO hardware interface, configures
443 * master port with system-specific info, and registers the
444 * master port with the RapidIO subsystem.
446 static int fsl_rio_setup(struct platform_device *dev)
449 struct rio_mport *port;
450 struct rio_priv *priv;
452 const u32 *port_index;
453 u32 active_ports = 0;
454 struct device_node *np, *rmu_node;
459 struct device_node *rmu_np[MAX_MSG_UNIT_NUM] = {NULL};
461 if (!dev->dev.of_node) {
462 dev_err(&dev->dev, "Device OF-Node is NULL");
466 rio_regs_win = of_iomap(dev->dev.of_node, 0);
468 dev_err(&dev->dev, "Unable to map rio register window\n");
473 ops = kzalloc(sizeof(struct rio_ops), GFP_KERNEL);
478 ops->lcread = fsl_local_config_read;
479 ops->lcwrite = fsl_local_config_write;
480 ops->cread = fsl_rio_config_read;
481 ops->cwrite = fsl_rio_config_write;
482 ops->dsend = fsl_rio_doorbell_send;
483 ops->pwenable = fsl_rio_pw_enable;
484 ops->open_outb_mbox = fsl_open_outb_mbox;
485 ops->open_inb_mbox = fsl_open_inb_mbox;
486 ops->close_outb_mbox = fsl_close_outb_mbox;
487 ops->close_inb_mbox = fsl_close_inb_mbox;
488 ops->add_outb_message = fsl_add_outb_message;
489 ops->add_inb_buffer = fsl_add_inb_buffer;
490 ops->get_inb_message = fsl_get_inb_message;
491 ops->map_inb = fsl_map_inb_mem;
492 ops->unmap_inb = fsl_unmap_inb_mem;
494 rmu_node = of_parse_phandle(dev->dev.of_node, "fsl,srio-rmu-handle", 0);
496 dev_err(&dev->dev, "No valid fsl,srio-rmu-handle property\n");
500 rmu_regs_win = of_iomap(rmu_node, 0);
502 of_node_put(rmu_node);
504 dev_err(&dev->dev, "Unable to map rmu register window\n");
508 for_each_compatible_node(np, NULL, "fsl,srio-msg-unit") {
513 /*set up doobell node*/
514 np = of_find_compatible_node(NULL, NULL, "fsl,srio-dbell-unit");
516 dev_err(&dev->dev, "No fsl,srio-dbell-unit node\n");
520 dbell = kzalloc(sizeof(struct fsl_rio_dbell), GFP_KERNEL);
522 dev_err(&dev->dev, "Can't alloc memory for 'fsl_rio_dbell'\n");
526 dbell->dev = &dev->dev;
527 dbell->bellirq = irq_of_parse_and_map(np, 1);
528 dev_info(&dev->dev, "bellirq: %d\n", dbell->bellirq);
530 if (of_property_read_reg(np, 0, &range_start, NULL)) {
531 pr_err("%pOF: unable to find 'reg' property\n",
536 dbell->dbell_regs = (struct rio_dbell_regs *)(rmu_regs_win +
539 /*set up port write node*/
540 np = of_find_compatible_node(NULL, NULL, "fsl,srio-port-write-unit");
542 dev_err(&dev->dev, "No fsl,srio-port-write-unit node\n");
546 pw = kzalloc(sizeof(struct fsl_rio_pw), GFP_KERNEL);
548 dev_err(&dev->dev, "Can't alloc memory for 'fsl_rio_pw'\n");
553 pw->pwirq = irq_of_parse_and_map(np, 0);
554 dev_info(&dev->dev, "pwirq: %d\n", pw->pwirq);
555 if (of_property_read_reg(np, 0, &range_start, NULL)) {
556 pr_err("%pOF: unable to find 'reg' property\n",
561 pw->pw_regs = (struct rio_pw_regs *)(rmu_regs_win + (u32)range_start);
563 /*set up ports node*/
564 for_each_child_of_node(dev->dev.of_node, np) {
567 port_index = of_get_property(np, "cell-index", NULL);
569 dev_err(&dev->dev, "Can't get %pOF property 'cell-index'\n",
574 if (of_range_to_resource(np, 0, &res)) {
575 dev_err(&dev->dev, "Can't get %pOF property 'ranges'\n",
580 dev_info(&dev->dev, "%pOF: LAW %pR\n",
583 port = kzalloc(sizeof(struct rio_mport), GFP_KERNEL);
587 rc = rio_mport_initialize(port);
594 port->index = (unsigned char)i;
596 priv = kzalloc(sizeof(struct rio_priv), GFP_KERNEL);
598 dev_err(&dev->dev, "Can't alloc memory for 'priv'\n");
603 INIT_LIST_HEAD(&port->dbells);
604 port->iores = res; /* struct copy */
605 port->iores.name = "rio_io_win";
607 if (request_resource(&iomem_resource, &port->iores) < 0) {
608 dev_err(&dev->dev, "RIO: Error requesting master port region"
609 " 0x%016llx-0x%016llx\n",
610 (u64)port->iores.start, (u64)port->iores.end);
615 sprintf(port->name, "RIO mport %d", i);
617 priv->dev = &dev->dev;
618 port->dev.parent = &dev->dev;
621 port->phys_efptr = 0x100;
623 priv->regs_win = rio_regs_win;
625 ccsr = in_be32(priv->regs_win + RIO_CCSR + i*0x20);
627 /* Checking the port training status */
628 if (in_be32((priv->regs_win + RIO_ESCSR + i*0x20)) & 1) {
629 dev_err(&dev->dev, "Port %d is not ready. "
630 "Try to restart connection...\n", i);
632 out_be32(priv->regs_win
633 + RIO_CCSR + i*0x20, 0);
635 setbits32(priv->regs_win
636 + RIO_CCSR + i*0x20, 0x02000000);
638 setbits32(priv->regs_win
639 + RIO_CCSR + i*0x20, 0x00600000);
641 if (in_be32((priv->regs_win
642 + RIO_ESCSR + i*0x20)) & 1) {
644 "Port %d restart failed.\n", i);
645 release_resource(&port->iores);
650 dev_info(&dev->dev, "Port %d restart success!\n", i);
652 fsl_rio_info(&dev->dev, ccsr);
654 port->sys_size = (in_be32((priv->regs_win + RIO_PEF_CAR))
655 & RIO_PEF_CTLS) >> 4;
656 dev_info(&dev->dev, "RapidIO Common Transport System size: %d\n",
657 port->sys_size ? 65536 : 256);
659 if (port->host_deviceid >= 0)
660 out_be32(priv->regs_win + RIO_GCCSR, RIO_PORT_GEN_HOST |
661 RIO_PORT_GEN_MASTER | RIO_PORT_GEN_DISCOVERED);
663 out_be32(priv->regs_win + RIO_GCCSR,
664 RIO_PORT_GEN_MASTER);
666 priv->atmu_regs = (struct rio_atmu_regs *)(priv->regs_win
667 + ((i == 0) ? RIO_ATMU_REGS_PORT1_OFFSET :
668 RIO_ATMU_REGS_PORT2_OFFSET));
670 priv->maint_atmu_regs = priv->atmu_regs + 1;
671 priv->inb_atmu_regs = (struct rio_inb_atmu_regs __iomem *)
673 ((i == 0) ? RIO_INB_ATMU_REGS_PORT1_OFFSET :
674 RIO_INB_ATMU_REGS_PORT2_OFFSET));
676 /* Set to receive packets with any dest ID */
677 out_be32((priv->regs_win + RIO_ISR_AACR + i*0x80),
680 /* Configure maintenance transaction window */
681 out_be32(&priv->maint_atmu_regs->rowbar,
682 port->iores.start >> 12);
683 out_be32(&priv->maint_atmu_regs->rowar,
684 0x80077000 | (ilog2(RIO_MAINT_WIN_SIZE) - 1));
686 priv->maint_win = ioremap(port->iores.start,
689 rio_law_start = range_start;
691 fsl_rio_setup_rmu(port, rmu_np[i]);
692 fsl_rio_inbound_mem_init(priv);
694 dbell->mport[i] = port;
697 if (rio_register_mport(port)) {
698 release_resource(&port->iores);
711 fsl_rio_doorbell_init(dbell);
712 fsl_rio_port_write_init(pw);
722 iounmap(rmu_regs_win);
727 iounmap(rio_regs_win);
733 /* The probe function for RapidIO peer-to-peer network.
735 static int fsl_of_rio_rpn_probe(struct platform_device *dev)
737 printk(KERN_INFO "Setting up RapidIO peer-to-peer network %pOF\n",
740 return fsl_rio_setup(dev);
743 static const struct of_device_id fsl_of_rio_rpn_ids[] = {
745 .compatible = "fsl,srio",
750 static struct platform_driver fsl_of_rio_rpn_driver = {
752 .name = "fsl-of-rio",
753 .of_match_table = fsl_of_rio_rpn_ids,
755 .probe = fsl_of_rio_rpn_probe,
758 static __init int fsl_of_rio_rpn_init(void)
760 return platform_driver_register(&fsl_of_rio_rpn_driver);
763 subsys_initcall(fsl_of_rio_rpn_init);