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>
26 #include <linux/device.h>
27 #include <linux/of_address.h>
28 #include <linux/of_irq.h>
29 #include <linux/of_platform.h>
30 #include <linux/delay.h>
31 #include <linux/slab.h>
34 #include <linux/uaccess.h>
35 #include <asm/machdep.h>
39 #undef DEBUG_PW /* Port-Write debugging */
41 #define RIO_PORT1_EDCSR 0x0640
42 #define RIO_PORT2_EDCSR 0x0680
43 #define RIO_PORT1_IECSR 0x10130
44 #define RIO_PORT2_IECSR 0x101B0
46 #define RIO_GCCSR 0x13c
47 #define RIO_ESCSR 0x158
48 #define ESCSR_CLEAR 0x07120204
49 #define RIO_PORT2_ESCSR 0x178
50 #define RIO_CCSR 0x15c
51 #define RIO_LTLEDCSR_IER 0x80000000
52 #define RIO_LTLEDCSR_PRT 0x01000000
53 #define IECSR_CLEAR 0x80000000
54 #define RIO_ISR_AACR 0x10120
55 #define RIO_ISR_AACR_AA 0x1 /* Accept All ID */
57 #define RIWTAR_TRAD_VAL_SHIFT 12
58 #define RIWTAR_TRAD_MASK 0x00FFFFFF
59 #define RIWBAR_BADD_VAL_SHIFT 12
60 #define RIWBAR_BADD_MASK 0x003FFFFF
61 #define RIWAR_ENABLE 0x80000000
62 #define RIWAR_TGINT_LOCAL 0x00F00000
63 #define RIWAR_RDTYP_NO_SNOOP 0x00040000
64 #define RIWAR_RDTYP_SNOOP 0x00050000
65 #define RIWAR_WRTYP_NO_SNOOP 0x00004000
66 #define RIWAR_WRTYP_SNOOP 0x00005000
67 #define RIWAR_WRTYP_ALLOC 0x00006000
68 #define RIWAR_SIZE_MASK 0x0000003F
70 static DEFINE_SPINLOCK(fsl_rio_config_lock);
72 #define ___fsl_read_rio_config(x, addr, err, op, barrier) \
73 __asm__ __volatile__( \
74 "1: "op" %1,0(%2)\n" \
77 ".section .fixup,\"ax\"\n" \
83 : "=r" (err), "=r" (x) \
84 : "b" (addr), "i" (-EFAULT), "0" (err))
87 #define __fsl_read_rio_config(x, addr, err, op) \
88 ___fsl_read_rio_config(x, addr, err, op, "mbar")
90 #define __fsl_read_rio_config(x, addr, err, op) \
91 ___fsl_read_rio_config(x, addr, err, op, "eieio")
94 void __iomem *rio_regs_win;
95 void __iomem *rmu_regs_win;
96 resource_size_t rio_law_start;
98 struct fsl_rio_dbell *dbell;
99 struct fsl_rio_pw *pw;
101 #ifdef CONFIG_PPC_E500
102 int fsl_rio_mcheck_exception(struct pt_regs *regs)
104 const struct exception_table_entry *entry;
105 unsigned long reason;
110 reason = in_be32((u32 *)(rio_regs_win + RIO_LTLEDCSR));
111 if (reason & (RIO_LTLEDCSR_IER | RIO_LTLEDCSR_PRT)) {
112 /* Check if we are prepared to handle this fault */
113 entry = search_exception_tables(regs->nip);
115 pr_debug("RIO: %s - MC Exception handled\n",
117 out_be32((u32 *)(rio_regs_win + RIO_LTLEDCSR),
119 regs_set_recoverable(regs);
120 regs_set_return_ip(regs, extable_fixup(entry));
127 EXPORT_SYMBOL_GPL(fsl_rio_mcheck_exception);
131 * fsl_local_config_read - Generate a MPC85xx local config space read
132 * @mport: RapidIO master port info
133 * @index: ID of RapdiIO interface
134 * @offset: Offset into configuration space
135 * @len: Length (in bytes) of the maintenance transaction
136 * @data: Value to be read into
138 * Generates a MPC85xx local configuration space read. Returns %0 on
139 * success or %-EINVAL on failure.
141 static int fsl_local_config_read(struct rio_mport *mport,
142 int index, u32 offset, int len, u32 *data)
144 struct rio_priv *priv = mport->priv;
145 pr_debug("fsl_local_config_read: index %d offset %8.8x\n", index,
147 *data = in_be32(priv->regs_win + offset);
153 * fsl_local_config_write - Generate a MPC85xx local config space write
154 * @mport: RapidIO master port info
155 * @index: ID of RapdiIO interface
156 * @offset: Offset into configuration space
157 * @len: Length (in bytes) of the maintenance transaction
158 * @data: Value to be written
160 * Generates a MPC85xx local configuration space write. Returns %0 on
161 * success or %-EINVAL on failure.
163 static int fsl_local_config_write(struct rio_mport *mport,
164 int index, u32 offset, int len, u32 data)
166 struct rio_priv *priv = mport->priv;
168 ("fsl_local_config_write: index %d offset %8.8x data %8.8x\n",
169 index, offset, data);
170 out_be32(priv->regs_win + offset, data);
176 * fsl_rio_config_read - Generate a MPC85xx read maintenance transaction
177 * @mport: RapidIO master port info
178 * @index: ID of RapdiIO interface
179 * @destid: Destination ID of transaction
180 * @hopcount: Number of hops to target device
181 * @offset: Offset into configuration space
182 * @len: Length (in bytes) of the maintenance transaction
183 * @val: Location to be read into
185 * Generates a MPC85xx read maintenance transaction. Returns %0 on
186 * success or %-EINVAL on failure.
189 fsl_rio_config_read(struct rio_mport *mport, int index, u16 destid,
190 u8 hopcount, u32 offset, int len, u32 *val)
192 struct rio_priv *priv = mport->priv;
198 ("fsl_rio_config_read:"
199 " index %d destid %d hopcount %d offset %8.8x len %d\n",
200 index, destid, hopcount, offset, len);
202 /* 16MB maintenance window possible */
203 /* allow only aligned access to maintenance registers */
204 if (offset > (0x1000000 - len) || !IS_ALIGNED(offset, len))
207 spin_lock_irqsave(&fsl_rio_config_lock, flags);
209 out_be32(&priv->maint_atmu_regs->rowtar,
210 (destid << 22) | (hopcount << 12) | (offset >> 12));
211 out_be32(&priv->maint_atmu_regs->rowtear, (destid >> 10));
213 data = (u8 *) priv->maint_win + (offset & (RIO_MAINT_WIN_SIZE - 1));
216 __fsl_read_rio_config(rval, data, err, "lbz");
219 __fsl_read_rio_config(rval, data, err, "lhz");
222 __fsl_read_rio_config(rval, data, err, "lwz");
225 spin_unlock_irqrestore(&fsl_rio_config_lock, flags);
230 pr_debug("RIO: cfg_read error %d for %x:%x:%x\n",
231 err, destid, hopcount, offset);
234 spin_unlock_irqrestore(&fsl_rio_config_lock, flags);
241 * fsl_rio_config_write - Generate a MPC85xx write maintenance transaction
242 * @mport: RapidIO master port info
243 * @index: ID of RapdiIO interface
244 * @destid: Destination ID of transaction
245 * @hopcount: Number of hops to target device
246 * @offset: Offset into configuration space
247 * @len: Length (in bytes) of the maintenance transaction
248 * @val: Value to be written
250 * Generates an MPC85xx write maintenance transaction. Returns %0 on
251 * success or %-EINVAL on failure.
254 fsl_rio_config_write(struct rio_mport *mport, int index, u16 destid,
255 u8 hopcount, u32 offset, int len, u32 val)
257 struct rio_priv *priv = mport->priv;
263 ("fsl_rio_config_write:"
264 " index %d destid %d hopcount %d offset %8.8x len %d val %8.8x\n",
265 index, destid, hopcount, offset, len, val);
267 /* 16MB maintenance windows possible */
268 /* allow only aligned access to maintenance registers */
269 if (offset > (0x1000000 - len) || !IS_ALIGNED(offset, len))
272 spin_lock_irqsave(&fsl_rio_config_lock, flags);
274 out_be32(&priv->maint_atmu_regs->rowtar,
275 (destid << 22) | (hopcount << 12) | (offset >> 12));
276 out_be32(&priv->maint_atmu_regs->rowtear, (destid >> 10));
278 data = (u8 *) priv->maint_win + (offset & (RIO_MAINT_WIN_SIZE - 1));
281 out_8((u8 *) data, val);
284 out_be16((u16 *) data, val);
287 out_be32((u32 *) data, val);
292 spin_unlock_irqrestore(&fsl_rio_config_lock, flags);
297 static void fsl_rio_inbound_mem_init(struct rio_priv *priv)
301 /* close inbound windows */
302 for (i = 0; i < RIO_INB_ATMU_COUNT; i++)
303 out_be32(&priv->inb_atmu_regs[i].riwar, 0);
306 int fsl_map_inb_mem(struct rio_mport *mport, dma_addr_t lstart,
307 u64 rstart, u64 size, u32 flags)
309 struct rio_priv *priv = mport->priv;
311 unsigned int base_size_log;
312 u64 win_start, win_end;
316 if ((size & (size - 1)) != 0 || size > 0x400000000ULL)
319 base_size_log = ilog2(size);
320 base_size = 1 << base_size_log;
322 /* check if addresses are aligned with the window size */
323 if (lstart & (base_size - 1))
325 if (rstart & (base_size - 1))
328 /* check for conflicting ranges */
329 for (i = 0; i < RIO_INB_ATMU_COUNT; i++) {
330 riwar = in_be32(&priv->inb_atmu_regs[i].riwar);
331 if ((riwar & RIWAR_ENABLE) == 0)
333 win_start = ((u64)(in_be32(&priv->inb_atmu_regs[i].riwbar) & RIWBAR_BADD_MASK))
334 << RIWBAR_BADD_VAL_SHIFT;
335 win_end = win_start + ((1 << ((riwar & RIWAR_SIZE_MASK) + 1)) - 1);
336 if (rstart < win_end && (rstart + size) > win_start)
340 /* find unused atmu */
341 for (i = 0; i < RIO_INB_ATMU_COUNT; i++) {
342 riwar = in_be32(&priv->inb_atmu_regs[i].riwar);
343 if ((riwar & RIWAR_ENABLE) == 0)
346 if (i >= RIO_INB_ATMU_COUNT)
349 out_be32(&priv->inb_atmu_regs[i].riwtar, lstart >> RIWTAR_TRAD_VAL_SHIFT);
350 out_be32(&priv->inb_atmu_regs[i].riwbar, rstart >> RIWBAR_BADD_VAL_SHIFT);
351 out_be32(&priv->inb_atmu_regs[i].riwar, RIWAR_ENABLE | RIWAR_TGINT_LOCAL |
352 RIWAR_RDTYP_SNOOP | RIWAR_WRTYP_SNOOP | (base_size_log - 1));
357 void fsl_unmap_inb_mem(struct rio_mport *mport, dma_addr_t lstart)
359 u32 win_start_shift, base_start_shift;
360 struct rio_priv *priv = mport->priv;
364 /* skip default window */
365 base_start_shift = lstart >> RIWTAR_TRAD_VAL_SHIFT;
366 for (i = 0; i < RIO_INB_ATMU_COUNT; i++) {
367 riwar = in_be32(&priv->inb_atmu_regs[i].riwar);
368 if ((riwar & RIWAR_ENABLE) == 0)
371 riwtar = in_be32(&priv->inb_atmu_regs[i].riwtar);
372 win_start_shift = riwtar & RIWTAR_TRAD_MASK;
373 if (win_start_shift == base_start_shift) {
374 out_be32(&priv->inb_atmu_regs[i].riwar, riwar & ~RIWAR_ENABLE);
380 void fsl_rio_port_error_handler(int offset)
382 /*XXX: Error recovery is not implemented, we just clear errors */
383 out_be32((u32 *)(rio_regs_win + RIO_LTLEDCSR), 0);
386 out_be32((u32 *)(rio_regs_win + RIO_PORT1_EDCSR), 0);
387 out_be32((u32 *)(rio_regs_win + RIO_PORT1_IECSR), IECSR_CLEAR);
388 out_be32((u32 *)(rio_regs_win + RIO_ESCSR), ESCSR_CLEAR);
390 out_be32((u32 *)(rio_regs_win + RIO_PORT2_EDCSR), 0);
391 out_be32((u32 *)(rio_regs_win + RIO_PORT2_IECSR), IECSR_CLEAR);
392 out_be32((u32 *)(rio_regs_win + RIO_PORT2_ESCSR), ESCSR_CLEAR);
395 static inline void fsl_rio_info(struct device *dev, u32 ccsr)
400 switch (ccsr >> 30) {
411 dev_info(dev, "Hardware port width: %s\n", str);
413 switch ((ccsr >> 27) & 7) {
415 str = "Single-lane 0";
418 str = "Single-lane 2";
427 dev_info(dev, "Training connection status: %s\n", str);
430 if (!(ccsr & 0x80000000))
431 dev_info(dev, "Output port operating in 8-bit mode\n");
432 if (!(ccsr & 0x08000000))
433 dev_info(dev, "Input port operating in 8-bit mode\n");
438 * fsl_rio_setup - Setup Freescale PowerPC RapidIO interface
439 * @dev: platform_device pointer
441 * Initializes MPC85xx RapidIO hardware interface, configures
442 * master port with system-specific info, and registers the
443 * master port with the RapidIO subsystem.
445 int fsl_rio_setup(struct platform_device *dev)
448 struct rio_mport *port;
449 struct rio_priv *priv;
451 const u32 *port_index;
452 u32 active_ports = 0;
453 struct device_node *np, *rmu_node;
458 struct device_node *rmu_np[MAX_MSG_UNIT_NUM] = {NULL};
460 if (!dev->dev.of_node) {
461 dev_err(&dev->dev, "Device OF-Node is NULL");
465 rio_regs_win = of_iomap(dev->dev.of_node, 0);
467 dev_err(&dev->dev, "Unable to map rio register window\n");
472 ops = kzalloc(sizeof(struct rio_ops), GFP_KERNEL);
477 ops->lcread = fsl_local_config_read;
478 ops->lcwrite = fsl_local_config_write;
479 ops->cread = fsl_rio_config_read;
480 ops->cwrite = fsl_rio_config_write;
481 ops->dsend = fsl_rio_doorbell_send;
482 ops->pwenable = fsl_rio_pw_enable;
483 ops->open_outb_mbox = fsl_open_outb_mbox;
484 ops->open_inb_mbox = fsl_open_inb_mbox;
485 ops->close_outb_mbox = fsl_close_outb_mbox;
486 ops->close_inb_mbox = fsl_close_inb_mbox;
487 ops->add_outb_message = fsl_add_outb_message;
488 ops->add_inb_buffer = fsl_add_inb_buffer;
489 ops->get_inb_message = fsl_get_inb_message;
490 ops->map_inb = fsl_map_inb_mem;
491 ops->unmap_inb = fsl_unmap_inb_mem;
493 rmu_node = of_parse_phandle(dev->dev.of_node, "fsl,srio-rmu-handle", 0);
495 dev_err(&dev->dev, "No valid fsl,srio-rmu-handle property\n");
499 rmu_regs_win = of_iomap(rmu_node, 0);
501 of_node_put(rmu_node);
503 dev_err(&dev->dev, "Unable to map rmu register window\n");
507 for_each_compatible_node(np, NULL, "fsl,srio-msg-unit") {
512 /*set up doobell node*/
513 np = of_find_compatible_node(NULL, NULL, "fsl,srio-dbell-unit");
515 dev_err(&dev->dev, "No fsl,srio-dbell-unit node\n");
519 dbell = kzalloc(sizeof(struct fsl_rio_dbell), GFP_KERNEL);
521 dev_err(&dev->dev, "Can't alloc memory for 'fsl_rio_dbell'\n");
525 dbell->dev = &dev->dev;
526 dbell->bellirq = irq_of_parse_and_map(np, 1);
527 dev_info(&dev->dev, "bellirq: %d\n", dbell->bellirq);
529 if (of_property_read_reg(np, 0, &range_start, NULL)) {
530 pr_err("%pOF: unable to find 'reg' property\n",
535 dbell->dbell_regs = (struct rio_dbell_regs *)(rmu_regs_win +
538 /*set up port write node*/
539 np = of_find_compatible_node(NULL, NULL, "fsl,srio-port-write-unit");
541 dev_err(&dev->dev, "No fsl,srio-port-write-unit node\n");
545 pw = kzalloc(sizeof(struct fsl_rio_pw), GFP_KERNEL);
547 dev_err(&dev->dev, "Can't alloc memory for 'fsl_rio_pw'\n");
552 pw->pwirq = irq_of_parse_and_map(np, 0);
553 dev_info(&dev->dev, "pwirq: %d\n", pw->pwirq);
554 if (of_property_read_reg(np, 0, &range_start, NULL)) {
555 pr_err("%pOF: unable to find 'reg' property\n",
560 pw->pw_regs = (struct rio_pw_regs *)(rmu_regs_win + (u32)range_start);
562 /*set up ports node*/
563 for_each_child_of_node(dev->dev.of_node, np) {
566 port_index = of_get_property(np, "cell-index", NULL);
568 dev_err(&dev->dev, "Can't get %pOF property 'cell-index'\n",
573 if (of_range_to_resource(np, 0, &res)) {
574 dev_err(&dev->dev, "Can't get %pOF property 'ranges'\n",
579 dev_info(&dev->dev, "%pOF: LAW %pR\n",
582 port = kzalloc(sizeof(struct rio_mport), GFP_KERNEL);
586 rc = rio_mport_initialize(port);
593 port->index = (unsigned char)i;
595 priv = kzalloc(sizeof(struct rio_priv), GFP_KERNEL);
597 dev_err(&dev->dev, "Can't alloc memory for 'priv'\n");
602 INIT_LIST_HEAD(&port->dbells);
603 port->iores = res; /* struct copy */
604 port->iores.name = "rio_io_win";
606 if (request_resource(&iomem_resource, &port->iores) < 0) {
607 dev_err(&dev->dev, "RIO: Error requesting master port region"
608 " 0x%016llx-0x%016llx\n",
609 (u64)port->iores.start, (u64)port->iores.end);
614 sprintf(port->name, "RIO mport %d", i);
616 priv->dev = &dev->dev;
617 port->dev.parent = &dev->dev;
620 port->phys_efptr = 0x100;
622 priv->regs_win = rio_regs_win;
624 ccsr = in_be32(priv->regs_win + RIO_CCSR + i*0x20);
626 /* Checking the port training status */
627 if (in_be32((priv->regs_win + RIO_ESCSR + i*0x20)) & 1) {
628 dev_err(&dev->dev, "Port %d is not ready. "
629 "Try to restart connection...\n", i);
631 out_be32(priv->regs_win
632 + RIO_CCSR + i*0x20, 0);
634 setbits32(priv->regs_win
635 + RIO_CCSR + i*0x20, 0x02000000);
637 setbits32(priv->regs_win
638 + RIO_CCSR + i*0x20, 0x00600000);
640 if (in_be32((priv->regs_win
641 + RIO_ESCSR + i*0x20)) & 1) {
643 "Port %d restart failed.\n", i);
644 release_resource(&port->iores);
649 dev_info(&dev->dev, "Port %d restart success!\n", i);
651 fsl_rio_info(&dev->dev, ccsr);
653 port->sys_size = (in_be32((priv->regs_win + RIO_PEF_CAR))
654 & RIO_PEF_CTLS) >> 4;
655 dev_info(&dev->dev, "RapidIO Common Transport System size: %d\n",
656 port->sys_size ? 65536 : 256);
658 if (port->host_deviceid >= 0)
659 out_be32(priv->regs_win + RIO_GCCSR, RIO_PORT_GEN_HOST |
660 RIO_PORT_GEN_MASTER | RIO_PORT_GEN_DISCOVERED);
662 out_be32(priv->regs_win + RIO_GCCSR,
663 RIO_PORT_GEN_MASTER);
665 priv->atmu_regs = (struct rio_atmu_regs *)(priv->regs_win
666 + ((i == 0) ? RIO_ATMU_REGS_PORT1_OFFSET :
667 RIO_ATMU_REGS_PORT2_OFFSET));
669 priv->maint_atmu_regs = priv->atmu_regs + 1;
670 priv->inb_atmu_regs = (struct rio_inb_atmu_regs __iomem *)
672 ((i == 0) ? RIO_INB_ATMU_REGS_PORT1_OFFSET :
673 RIO_INB_ATMU_REGS_PORT2_OFFSET));
675 /* Set to receive packets with any dest ID */
676 out_be32((priv->regs_win + RIO_ISR_AACR + i*0x80),
679 /* Configure maintenance transaction window */
680 out_be32(&priv->maint_atmu_regs->rowbar,
681 port->iores.start >> 12);
682 out_be32(&priv->maint_atmu_regs->rowar,
683 0x80077000 | (ilog2(RIO_MAINT_WIN_SIZE) - 1));
685 priv->maint_win = ioremap(port->iores.start,
688 rio_law_start = range_start;
690 fsl_rio_setup_rmu(port, rmu_np[i]);
691 fsl_rio_inbound_mem_init(priv);
693 dbell->mport[i] = port;
696 if (rio_register_mport(port)) {
697 release_resource(&port->iores);
710 fsl_rio_doorbell_init(dbell);
711 fsl_rio_port_write_init(pw);
721 iounmap(rmu_regs_win);
726 iounmap(rio_regs_win);
732 /* The probe function for RapidIO peer-to-peer network.
734 static int fsl_of_rio_rpn_probe(struct platform_device *dev)
736 printk(KERN_INFO "Setting up RapidIO peer-to-peer network %pOF\n",
739 return fsl_rio_setup(dev);
742 static const struct of_device_id fsl_of_rio_rpn_ids[] = {
744 .compatible = "fsl,srio",
749 static struct platform_driver fsl_of_rio_rpn_driver = {
751 .name = "fsl-of-rio",
752 .of_match_table = fsl_of_rio_rpn_ids,
754 .probe = fsl_of_rio_rpn_probe,
757 static __init int fsl_of_rio_rpn_init(void)
759 return platform_driver_register(&fsl_of_rio_rpn_driver);
762 subsys_initcall(fsl_of_rio_rpn_init);