1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * Freescale MPC85xx/MPC86xx RapidIO support
5 * Copyright 2009 Sysgo AG
6 * Thomas Moll <thomas.moll@sysgo.com>
7 * - fixed maintenance access routines, check for aligned access
9 * Copyright 2009 Integrated Device Technology, Inc.
10 * Alex Bounine <alexandre.bounine@idt.com>
11 * - Added Port-Write message handling
12 * - Added Machine Check exception handling
14 * Copyright (C) 2007, 2008, 2010, 2011 Freescale Semiconductor, Inc.
15 * Zhang Wei <wei.zhang@freescale.com>
17 * Copyright 2005 MontaVista Software, Inc.
18 * Matt Porter <mporter@kernel.crashing.org>
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) \
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))
86 void __iomem *rio_regs_win;
87 void __iomem *rmu_regs_win;
88 resource_size_t rio_law_start;
90 struct fsl_rio_dbell *dbell;
91 struct fsl_rio_pw *pw;
94 int fsl_rio_mcheck_exception(struct pt_regs *regs)
96 const struct exception_table_entry *entry;
102 reason = in_be32((u32 *)(rio_regs_win + RIO_LTLEDCSR));
103 if (reason & (RIO_LTLEDCSR_IER | RIO_LTLEDCSR_PRT)) {
104 /* Check if we are prepared to handle this fault */
105 entry = search_exception_tables(regs->nip);
107 pr_debug("RIO: %s - MC Exception handled\n",
109 out_be32((u32 *)(rio_regs_win + RIO_LTLEDCSR),
111 regs_set_recoverable(regs);
112 regs_set_return_ip(regs, extable_fixup(entry));
119 EXPORT_SYMBOL_GPL(fsl_rio_mcheck_exception);
123 * fsl_local_config_read - Generate a MPC85xx local config space read
124 * @mport: RapidIO master port info
125 * @index: ID of RapdiIO interface
126 * @offset: Offset into configuration space
127 * @len: Length (in bytes) of the maintenance transaction
128 * @data: Value to be read into
130 * Generates a MPC85xx local configuration space read. Returns %0 on
131 * success or %-EINVAL on failure.
133 static int fsl_local_config_read(struct rio_mport *mport,
134 int index, u32 offset, int len, u32 *data)
136 struct rio_priv *priv = mport->priv;
137 pr_debug("fsl_local_config_read: index %d offset %8.8x\n", index,
139 *data = in_be32(priv->regs_win + offset);
145 * fsl_local_config_write - Generate a MPC85xx local config space write
146 * @mport: RapidIO master port info
147 * @index: ID of RapdiIO interface
148 * @offset: Offset into configuration space
149 * @len: Length (in bytes) of the maintenance transaction
150 * @data: Value to be written
152 * Generates a MPC85xx local configuration space write. Returns %0 on
153 * success or %-EINVAL on failure.
155 static int fsl_local_config_write(struct rio_mport *mport,
156 int index, u32 offset, int len, u32 data)
158 struct rio_priv *priv = mport->priv;
160 ("fsl_local_config_write: index %d offset %8.8x data %8.8x\n",
161 index, offset, data);
162 out_be32(priv->regs_win + offset, data);
168 * fsl_rio_config_read - Generate a MPC85xx read maintenance transaction
169 * @mport: RapidIO master port info
170 * @index: ID of RapdiIO interface
171 * @destid: Destination ID of transaction
172 * @hopcount: Number of hops to target device
173 * @offset: Offset into configuration space
174 * @len: Length (in bytes) of the maintenance transaction
175 * @val: Location to be read into
177 * Generates a MPC85xx read maintenance transaction. Returns %0 on
178 * success or %-EINVAL on failure.
181 fsl_rio_config_read(struct rio_mport *mport, int index, u16 destid,
182 u8 hopcount, u32 offset, int len, u32 *val)
184 struct rio_priv *priv = mport->priv;
190 ("fsl_rio_config_read:"
191 " index %d destid %d hopcount %d offset %8.8x len %d\n",
192 index, destid, hopcount, offset, len);
194 /* 16MB maintenance window possible */
195 /* allow only aligned access to maintenance registers */
196 if (offset > (0x1000000 - len) || !IS_ALIGNED(offset, len))
199 spin_lock_irqsave(&fsl_rio_config_lock, flags);
201 out_be32(&priv->maint_atmu_regs->rowtar,
202 (destid << 22) | (hopcount << 12) | (offset >> 12));
203 out_be32(&priv->maint_atmu_regs->rowtear, (destid >> 10));
205 data = (u8 *) priv->maint_win + (offset & (RIO_MAINT_WIN_SIZE - 1));
208 __fsl_read_rio_config(rval, data, err, "lbz");
211 __fsl_read_rio_config(rval, data, err, "lhz");
214 __fsl_read_rio_config(rval, data, err, "lwz");
217 spin_unlock_irqrestore(&fsl_rio_config_lock, flags);
222 pr_debug("RIO: cfg_read error %d for %x:%x:%x\n",
223 err, destid, hopcount, offset);
226 spin_unlock_irqrestore(&fsl_rio_config_lock, flags);
233 * fsl_rio_config_write - Generate a MPC85xx write maintenance transaction
234 * @mport: RapidIO master port info
235 * @index: ID of RapdiIO interface
236 * @destid: Destination ID of transaction
237 * @hopcount: Number of hops to target device
238 * @offset: Offset into configuration space
239 * @len: Length (in bytes) of the maintenance transaction
240 * @val: Value to be written
242 * Generates an MPC85xx write maintenance transaction. Returns %0 on
243 * success or %-EINVAL on failure.
246 fsl_rio_config_write(struct rio_mport *mport, int index, u16 destid,
247 u8 hopcount, u32 offset, int len, u32 val)
249 struct rio_priv *priv = mport->priv;
255 ("fsl_rio_config_write:"
256 " index %d destid %d hopcount %d offset %8.8x len %d val %8.8x\n",
257 index, destid, hopcount, offset, len, val);
259 /* 16MB maintenance windows possible */
260 /* allow only aligned access to maintenance registers */
261 if (offset > (0x1000000 - len) || !IS_ALIGNED(offset, len))
264 spin_lock_irqsave(&fsl_rio_config_lock, flags);
266 out_be32(&priv->maint_atmu_regs->rowtar,
267 (destid << 22) | (hopcount << 12) | (offset >> 12));
268 out_be32(&priv->maint_atmu_regs->rowtear, (destid >> 10));
270 data = (u8 *) priv->maint_win + (offset & (RIO_MAINT_WIN_SIZE - 1));
273 out_8((u8 *) data, val);
276 out_be16((u16 *) data, val);
279 out_be32((u32 *) data, val);
284 spin_unlock_irqrestore(&fsl_rio_config_lock, flags);
289 static void fsl_rio_inbound_mem_init(struct rio_priv *priv)
293 /* close inbound windows */
294 for (i = 0; i < RIO_INB_ATMU_COUNT; i++)
295 out_be32(&priv->inb_atmu_regs[i].riwar, 0);
298 int fsl_map_inb_mem(struct rio_mport *mport, dma_addr_t lstart,
299 u64 rstart, u64 size, u32 flags)
301 struct rio_priv *priv = mport->priv;
303 unsigned int base_size_log;
304 u64 win_start, win_end;
308 if ((size & (size - 1)) != 0 || size > 0x400000000ULL)
311 base_size_log = ilog2(size);
312 base_size = 1 << base_size_log;
314 /* check if addresses are aligned with the window size */
315 if (lstart & (base_size - 1))
317 if (rstart & (base_size - 1))
320 /* check for conflicting ranges */
321 for (i = 0; i < RIO_INB_ATMU_COUNT; i++) {
322 riwar = in_be32(&priv->inb_atmu_regs[i].riwar);
323 if ((riwar & RIWAR_ENABLE) == 0)
325 win_start = ((u64)(in_be32(&priv->inb_atmu_regs[i].riwbar) & RIWBAR_BADD_MASK))
326 << RIWBAR_BADD_VAL_SHIFT;
327 win_end = win_start + ((1 << ((riwar & RIWAR_SIZE_MASK) + 1)) - 1);
328 if (rstart < win_end && (rstart + size) > win_start)
332 /* find unused atmu */
333 for (i = 0; i < RIO_INB_ATMU_COUNT; i++) {
334 riwar = in_be32(&priv->inb_atmu_regs[i].riwar);
335 if ((riwar & RIWAR_ENABLE) == 0)
338 if (i >= RIO_INB_ATMU_COUNT)
341 out_be32(&priv->inb_atmu_regs[i].riwtar, lstart >> RIWTAR_TRAD_VAL_SHIFT);
342 out_be32(&priv->inb_atmu_regs[i].riwbar, rstart >> RIWBAR_BADD_VAL_SHIFT);
343 out_be32(&priv->inb_atmu_regs[i].riwar, RIWAR_ENABLE | RIWAR_TGINT_LOCAL |
344 RIWAR_RDTYP_SNOOP | RIWAR_WRTYP_SNOOP | (base_size_log - 1));
349 void fsl_unmap_inb_mem(struct rio_mport *mport, dma_addr_t lstart)
351 u32 win_start_shift, base_start_shift;
352 struct rio_priv *priv = mport->priv;
356 /* skip default window */
357 base_start_shift = lstart >> RIWTAR_TRAD_VAL_SHIFT;
358 for (i = 0; i < RIO_INB_ATMU_COUNT; i++) {
359 riwar = in_be32(&priv->inb_atmu_regs[i].riwar);
360 if ((riwar & RIWAR_ENABLE) == 0)
363 riwtar = in_be32(&priv->inb_atmu_regs[i].riwtar);
364 win_start_shift = riwtar & RIWTAR_TRAD_MASK;
365 if (win_start_shift == base_start_shift) {
366 out_be32(&priv->inb_atmu_regs[i].riwar, riwar & ~RIWAR_ENABLE);
372 void fsl_rio_port_error_handler(int offset)
374 /*XXX: Error recovery is not implemented, we just clear errors */
375 out_be32((u32 *)(rio_regs_win + RIO_LTLEDCSR), 0);
378 out_be32((u32 *)(rio_regs_win + RIO_PORT1_EDCSR), 0);
379 out_be32((u32 *)(rio_regs_win + RIO_PORT1_IECSR), IECSR_CLEAR);
380 out_be32((u32 *)(rio_regs_win + RIO_ESCSR), ESCSR_CLEAR);
382 out_be32((u32 *)(rio_regs_win + RIO_PORT2_EDCSR), 0);
383 out_be32((u32 *)(rio_regs_win + RIO_PORT2_IECSR), IECSR_CLEAR);
384 out_be32((u32 *)(rio_regs_win + RIO_PORT2_ESCSR), ESCSR_CLEAR);
387 static inline void fsl_rio_info(struct device *dev, u32 ccsr)
392 switch (ccsr >> 30) {
403 dev_info(dev, "Hardware port width: %s\n", str);
405 switch ((ccsr >> 27) & 7) {
407 str = "Single-lane 0";
410 str = "Single-lane 2";
419 dev_info(dev, "Training connection status: %s\n", str);
422 if (!(ccsr & 0x80000000))
423 dev_info(dev, "Output port operating in 8-bit mode\n");
424 if (!(ccsr & 0x08000000))
425 dev_info(dev, "Input port operating in 8-bit mode\n");
430 * fsl_rio_setup - Setup Freescale PowerPC RapidIO interface
431 * @dev: platform_device pointer
433 * Initializes MPC85xx RapidIO hardware interface, configures
434 * master port with system-specific info, and registers the
435 * master port with the RapidIO subsystem.
437 int fsl_rio_setup(struct platform_device *dev)
440 struct rio_mport *port;
441 struct rio_priv *priv;
443 const u32 *dt_range, *cell, *port_index;
444 u32 active_ports = 0;
445 struct resource regs, rmu_regs;
446 struct device_node *np, *rmu_node;
449 u64 range_start, range_size;
453 struct device_node *rmu_np[MAX_MSG_UNIT_NUM] = {NULL};
455 if (!dev->dev.of_node) {
456 dev_err(&dev->dev, "Device OF-Node is NULL");
460 rc = of_address_to_resource(dev->dev.of_node, 0, ®s);
462 dev_err(&dev->dev, "Can't get %pOF property 'reg'\n",
466 dev_info(&dev->dev, "Of-device full name %pOF\n",
468 dev_info(&dev->dev, "Regs: %pR\n", ®s);
470 rio_regs_win = ioremap(regs.start, resource_size(®s));
472 dev_err(&dev->dev, "Unable to map rio register window\n");
477 ops = kzalloc(sizeof(struct rio_ops), GFP_KERNEL);
482 ops->lcread = fsl_local_config_read;
483 ops->lcwrite = fsl_local_config_write;
484 ops->cread = fsl_rio_config_read;
485 ops->cwrite = fsl_rio_config_write;
486 ops->dsend = fsl_rio_doorbell_send;
487 ops->pwenable = fsl_rio_pw_enable;
488 ops->open_outb_mbox = fsl_open_outb_mbox;
489 ops->open_inb_mbox = fsl_open_inb_mbox;
490 ops->close_outb_mbox = fsl_close_outb_mbox;
491 ops->close_inb_mbox = fsl_close_inb_mbox;
492 ops->add_outb_message = fsl_add_outb_message;
493 ops->add_inb_buffer = fsl_add_inb_buffer;
494 ops->get_inb_message = fsl_get_inb_message;
495 ops->map_inb = fsl_map_inb_mem;
496 ops->unmap_inb = fsl_unmap_inb_mem;
498 rmu_node = of_parse_phandle(dev->dev.of_node, "fsl,srio-rmu-handle", 0);
500 dev_err(&dev->dev, "No valid fsl,srio-rmu-handle property\n");
504 rc = of_address_to_resource(rmu_node, 0, &rmu_regs);
506 dev_err(&dev->dev, "Can't get %pOF property 'reg'\n",
510 rmu_regs_win = ioremap(rmu_regs.start, resource_size(&rmu_regs));
512 dev_err(&dev->dev, "Unable to map rmu register window\n");
516 for_each_compatible_node(np, NULL, "fsl,srio-msg-unit") {
521 /*set up doobell node*/
522 np = of_find_compatible_node(NULL, NULL, "fsl,srio-dbell-unit");
524 dev_err(&dev->dev, "No fsl,srio-dbell-unit node\n");
528 dbell = kzalloc(sizeof(struct fsl_rio_dbell), GFP_KERNEL);
530 dev_err(&dev->dev, "Can't alloc memory for 'fsl_rio_dbell'\n");
534 dbell->dev = &dev->dev;
535 dbell->bellirq = irq_of_parse_and_map(np, 1);
536 dev_info(&dev->dev, "bellirq: %d\n", dbell->bellirq);
538 aw = of_n_addr_cells(np);
539 dt_range = of_get_property(np, "reg", &rlen);
541 pr_err("%pOF: unable to find 'reg' property\n",
546 range_start = of_read_number(dt_range, aw);
547 dbell->dbell_regs = (struct rio_dbell_regs *)(rmu_regs_win +
550 /*set up port write node*/
551 np = of_find_compatible_node(NULL, NULL, "fsl,srio-port-write-unit");
553 dev_err(&dev->dev, "No fsl,srio-port-write-unit node\n");
557 pw = kzalloc(sizeof(struct fsl_rio_pw), GFP_KERNEL);
559 dev_err(&dev->dev, "Can't alloc memory for 'fsl_rio_pw'\n");
564 pw->pwirq = irq_of_parse_and_map(np, 0);
565 dev_info(&dev->dev, "pwirq: %d\n", pw->pwirq);
566 aw = of_n_addr_cells(np);
567 dt_range = of_get_property(np, "reg", &rlen);
569 pr_err("%pOF: unable to find 'reg' property\n",
574 range_start = of_read_number(dt_range, aw);
575 pw->pw_regs = (struct rio_pw_regs *)(rmu_regs_win + (u32)range_start);
577 /*set up ports node*/
578 for_each_child_of_node(dev->dev.of_node, np) {
579 port_index = of_get_property(np, "cell-index", NULL);
581 dev_err(&dev->dev, "Can't get %pOF property 'cell-index'\n",
586 dt_range = of_get_property(np, "ranges", &rlen);
588 dev_err(&dev->dev, "Can't get %pOF property 'ranges'\n",
593 /* Get node address wide */
594 cell = of_get_property(np, "#address-cells", NULL);
598 aw = of_n_addr_cells(np);
599 /* Get node size wide */
600 cell = of_get_property(np, "#size-cells", NULL);
604 sw = of_n_size_cells(np);
605 /* Get parent address wide wide */
606 paw = of_n_addr_cells(np);
607 range_start = of_read_number(dt_range + aw, paw);
608 range_size = of_read_number(dt_range + aw + paw, sw);
610 dev_info(&dev->dev, "%pOF: LAW start 0x%016llx, size 0x%016llx.\n",
611 np, range_start, range_size);
613 port = kzalloc(sizeof(struct rio_mport), GFP_KERNEL);
617 rc = rio_mport_initialize(port);
624 port->index = (unsigned char)i;
626 priv = kzalloc(sizeof(struct rio_priv), GFP_KERNEL);
628 dev_err(&dev->dev, "Can't alloc memory for 'priv'\n");
633 INIT_LIST_HEAD(&port->dbells);
634 port->iores.start = range_start;
635 port->iores.end = port->iores.start + range_size - 1;
636 port->iores.flags = IORESOURCE_MEM;
637 port->iores.name = "rio_io_win";
639 if (request_resource(&iomem_resource, &port->iores) < 0) {
640 dev_err(&dev->dev, "RIO: Error requesting master port region"
641 " 0x%016llx-0x%016llx\n",
642 (u64)port->iores.start, (u64)port->iores.end);
647 sprintf(port->name, "RIO mport %d", i);
649 priv->dev = &dev->dev;
650 port->dev.parent = &dev->dev;
653 port->phys_efptr = 0x100;
655 priv->regs_win = rio_regs_win;
657 ccsr = in_be32(priv->regs_win + RIO_CCSR + i*0x20);
659 /* Checking the port training status */
660 if (in_be32((priv->regs_win + RIO_ESCSR + i*0x20)) & 1) {
661 dev_err(&dev->dev, "Port %d is not ready. "
662 "Try to restart connection...\n", i);
664 out_be32(priv->regs_win
665 + RIO_CCSR + i*0x20, 0);
667 setbits32(priv->regs_win
668 + RIO_CCSR + i*0x20, 0x02000000);
670 setbits32(priv->regs_win
671 + RIO_CCSR + i*0x20, 0x00600000);
673 if (in_be32((priv->regs_win
674 + RIO_ESCSR + i*0x20)) & 1) {
676 "Port %d restart failed.\n", i);
677 release_resource(&port->iores);
682 dev_info(&dev->dev, "Port %d restart success!\n", i);
684 fsl_rio_info(&dev->dev, ccsr);
686 port->sys_size = (in_be32((priv->regs_win + RIO_PEF_CAR))
687 & RIO_PEF_CTLS) >> 4;
688 dev_info(&dev->dev, "RapidIO Common Transport System size: %d\n",
689 port->sys_size ? 65536 : 256);
691 if (port->host_deviceid >= 0)
692 out_be32(priv->regs_win + RIO_GCCSR, RIO_PORT_GEN_HOST |
693 RIO_PORT_GEN_MASTER | RIO_PORT_GEN_DISCOVERED);
695 out_be32(priv->regs_win + RIO_GCCSR,
696 RIO_PORT_GEN_MASTER);
698 priv->atmu_regs = (struct rio_atmu_regs *)(priv->regs_win
699 + ((i == 0) ? RIO_ATMU_REGS_PORT1_OFFSET :
700 RIO_ATMU_REGS_PORT2_OFFSET));
702 priv->maint_atmu_regs = priv->atmu_regs + 1;
703 priv->inb_atmu_regs = (struct rio_inb_atmu_regs __iomem *)
705 ((i == 0) ? RIO_INB_ATMU_REGS_PORT1_OFFSET :
706 RIO_INB_ATMU_REGS_PORT2_OFFSET));
708 /* Set to receive packets with any dest ID */
709 out_be32((priv->regs_win + RIO_ISR_AACR + i*0x80),
712 /* Configure maintenance transaction window */
713 out_be32(&priv->maint_atmu_regs->rowbar,
714 port->iores.start >> 12);
715 out_be32(&priv->maint_atmu_regs->rowar,
716 0x80077000 | (ilog2(RIO_MAINT_WIN_SIZE) - 1));
718 priv->maint_win = ioremap(port->iores.start,
721 rio_law_start = range_start;
723 fsl_rio_setup_rmu(port, rmu_np[i]);
724 fsl_rio_inbound_mem_init(priv);
726 dbell->mport[i] = port;
729 if (rio_register_mport(port)) {
730 release_resource(&port->iores);
743 fsl_rio_doorbell_init(dbell);
744 fsl_rio_port_write_init(pw);
754 iounmap(rmu_regs_win);
759 iounmap(rio_regs_win);
765 /* The probe function for RapidIO peer-to-peer network.
767 static int fsl_of_rio_rpn_probe(struct platform_device *dev)
769 printk(KERN_INFO "Setting up RapidIO peer-to-peer network %pOF\n",
772 return fsl_rio_setup(dev);
775 static const struct of_device_id fsl_of_rio_rpn_ids[] = {
777 .compatible = "fsl,srio",
782 static struct platform_driver fsl_of_rio_rpn_driver = {
784 .name = "fsl-of-rio",
785 .of_match_table = fsl_of_rio_rpn_ids,
787 .probe = fsl_of_rio_rpn_probe,
790 static __init int fsl_of_rio_rpn_init(void)
792 return platform_driver_register(&fsl_of_rio_rpn_driver);
795 subsys_initcall(fsl_of_rio_rpn_init);