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9#include <linux/clk.h>
10#include <linux/delay.h>
11#include <linux/io.h>
12#include <linux/jiffies.h>
13#include <linux/memblock.h>
14#include <linux/init.h>
15#include <linux/of.h>
16#include <linux/of_address.h>
17#include <linux/of_irq.h>
18#include <linux/of_pci.h>
19#include <linux/pci.h>
20#include <linux/pci-acpi.h>
21#include <linux/pci-ecam.h>
22#include <linux/platform_device.h>
23#include <linux/slab.h>
24
25#include "../pci.h"
26
27#define PCIECORE_CTLANDSTATUS 0x50
28#define PIM1_1L 0x80
29#define IBAR2 0x98
30#define IR2MSK 0x9c
31#define PIM2_1L 0xa0
32#define IBAR3L 0xb4
33#define IR3MSKL 0xbc
34#define PIM3_1L 0xc4
35#define OMR1BARL 0x100
36#define OMR2BARL 0x118
37#define OMR3BARL 0x130
38#define CFGBARL 0x154
39#define CFGBARH 0x158
40#define CFGCTL 0x15c
41#define RTDID 0x160
42#define BRIDGE_CFG_0 0x2000
43#define BRIDGE_CFG_4 0x2010
44#define BRIDGE_STATUS_0 0x2600
45
46#define LINK_UP_MASK 0x00000100
47#define AXI_EP_CFG_ACCESS 0x10000
48#define EN_COHERENCY 0xF0000000
49#define EN_REG 0x00000001
50#define OB_LO_IO 0x00000002
51#define XGENE_PCIE_VENDORID 0x10E8
52#define XGENE_PCIE_DEVICEID 0xE004
53#define SZ_1T (SZ_1G*1024ULL)
54#define PIPE_PHY_RATE_RD(src) ((0xc000 & (u32)(src)) >> 0xe)
55
56#define XGENE_V1_PCI_EXP_CAP 0x40
57
58
59#define XGENE_PCIE_IP_VER_UNKN 0
60#define XGENE_PCIE_IP_VER_1 1
61#define XGENE_PCIE_IP_VER_2 2
62
63#if defined(CONFIG_PCI_XGENE) || (defined(CONFIG_ACPI) && defined(CONFIG_PCI_QUIRKS))
64struct xgene_pcie_port {
65 struct device_node *node;
66 struct device *dev;
67 struct clk *clk;
68 void __iomem *csr_base;
69 void __iomem *cfg_base;
70 unsigned long cfg_addr;
71 bool link_up;
72 u32 version;
73};
74
75static u32 xgene_pcie_readl(struct xgene_pcie_port *port, u32 reg)
76{
77 return readl(port->csr_base + reg);
78}
79
80static void xgene_pcie_writel(struct xgene_pcie_port *port, u32 reg, u32 val)
81{
82 writel(val, port->csr_base + reg);
83}
84
85static inline u32 pcie_bar_low_val(u32 addr, u32 flags)
86{
87 return (addr & PCI_BASE_ADDRESS_MEM_MASK) | flags;
88}
89
90static inline struct xgene_pcie_port *pcie_bus_to_port(struct pci_bus *bus)
91{
92 struct pci_config_window *cfg;
93
94 if (acpi_disabled)
95 return (struct xgene_pcie_port *)(bus->sysdata);
96
97 cfg = bus->sysdata;
98 return (struct xgene_pcie_port *)(cfg->priv);
99}
100
101
102
103
104
105static void __iomem *xgene_pcie_get_cfg_base(struct pci_bus *bus)
106{
107 struct xgene_pcie_port *port = pcie_bus_to_port(bus);
108
109 if (bus->number >= (bus->primary + 1))
110 return port->cfg_base + AXI_EP_CFG_ACCESS;
111
112 return port->cfg_base;
113}
114
115
116
117
118
119static void xgene_pcie_set_rtdid_reg(struct pci_bus *bus, uint devfn)
120{
121 struct xgene_pcie_port *port = pcie_bus_to_port(bus);
122 unsigned int b, d, f;
123 u32 rtdid_val = 0;
124
125 b = bus->number;
126 d = PCI_SLOT(devfn);
127 f = PCI_FUNC(devfn);
128
129 if (!pci_is_root_bus(bus))
130 rtdid_val = (b << 8) | (d << 3) | f;
131
132 xgene_pcie_writel(port, RTDID, rtdid_val);
133
134 xgene_pcie_readl(port, RTDID);
135}
136
137
138
139
140
141
142
143
144
145static bool xgene_pcie_hide_rc_bars(struct pci_bus *bus, int offset)
146{
147 if (pci_is_root_bus(bus) && ((offset == PCI_BASE_ADDRESS_0) ||
148 (offset == PCI_BASE_ADDRESS_1)))
149 return true;
150
151 return false;
152}
153
154static void __iomem *xgene_pcie_map_bus(struct pci_bus *bus, unsigned int devfn,
155 int offset)
156{
157 if ((pci_is_root_bus(bus) && devfn != 0) ||
158 xgene_pcie_hide_rc_bars(bus, offset))
159 return NULL;
160
161 xgene_pcie_set_rtdid_reg(bus, devfn);
162 return xgene_pcie_get_cfg_base(bus) + offset;
163}
164
165static int xgene_pcie_config_read32(struct pci_bus *bus, unsigned int devfn,
166 int where, int size, u32 *val)
167{
168 struct xgene_pcie_port *port = pcie_bus_to_port(bus);
169
170 if (pci_generic_config_read32(bus, devfn, where & ~0x3, 4, val) !=
171 PCIBIOS_SUCCESSFUL)
172 return PCIBIOS_DEVICE_NOT_FOUND;
173
174
175
176
177
178
179
180
181
182
183 if (pci_is_root_bus(bus) && (port->version == XGENE_PCIE_IP_VER_1) &&
184 ((where & ~0x3) == XGENE_V1_PCI_EXP_CAP + PCI_EXP_RTCTL))
185 *val &= ~(PCI_EXP_RTCAP_CRSVIS << 16);
186
187 if (size <= 2)
188 *val = (*val >> (8 * (where & 3))) & ((1 << (size * 8)) - 1);
189
190 return PCIBIOS_SUCCESSFUL;
191}
192#endif
193
194#if defined(CONFIG_ACPI) && defined(CONFIG_PCI_QUIRKS)
195static int xgene_get_csr_resource(struct acpi_device *adev,
196 struct resource *res)
197{
198 struct device *dev = &adev->dev;
199 struct resource_entry *entry;
200 struct list_head list;
201 unsigned long flags;
202 int ret;
203
204 INIT_LIST_HEAD(&list);
205 flags = IORESOURCE_MEM;
206 ret = acpi_dev_get_resources(adev, &list,
207 acpi_dev_filter_resource_type_cb,
208 (void *) flags);
209 if (ret < 0) {
210 dev_err(dev, "failed to parse _CRS method, error code %d\n",
211 ret);
212 return ret;
213 }
214
215 if (ret == 0) {
216 dev_err(dev, "no IO and memory resources present in _CRS\n");
217 return -EINVAL;
218 }
219
220 entry = list_first_entry(&list, struct resource_entry, node);
221 *res = *entry->res;
222 acpi_dev_free_resource_list(&list);
223 return 0;
224}
225
226static int xgene_pcie_ecam_init(struct pci_config_window *cfg, u32 ipversion)
227{
228 struct device *dev = cfg->parent;
229 struct acpi_device *adev = to_acpi_device(dev);
230 struct xgene_pcie_port *port;
231 struct resource csr;
232 int ret;
233
234 port = devm_kzalloc(dev, sizeof(*port), GFP_KERNEL);
235 if (!port)
236 return -ENOMEM;
237
238 ret = xgene_get_csr_resource(adev, &csr);
239 if (ret) {
240 dev_err(dev, "can't get CSR resource\n");
241 return ret;
242 }
243 port->csr_base = devm_pci_remap_cfg_resource(dev, &csr);
244 if (IS_ERR(port->csr_base))
245 return PTR_ERR(port->csr_base);
246
247 port->cfg_base = cfg->win;
248 port->version = ipversion;
249
250 cfg->priv = port;
251 return 0;
252}
253
254static int xgene_v1_pcie_ecam_init(struct pci_config_window *cfg)
255{
256 return xgene_pcie_ecam_init(cfg, XGENE_PCIE_IP_VER_1);
257}
258
259struct pci_ecam_ops xgene_v1_pcie_ecam_ops = {
260 .bus_shift = 16,
261 .init = xgene_v1_pcie_ecam_init,
262 .pci_ops = {
263 .map_bus = xgene_pcie_map_bus,
264 .read = xgene_pcie_config_read32,
265 .write = pci_generic_config_write,
266 }
267};
268
269static int xgene_v2_pcie_ecam_init(struct pci_config_window *cfg)
270{
271 return xgene_pcie_ecam_init(cfg, XGENE_PCIE_IP_VER_2);
272}
273
274struct pci_ecam_ops xgene_v2_pcie_ecam_ops = {
275 .bus_shift = 16,
276 .init = xgene_v2_pcie_ecam_init,
277 .pci_ops = {
278 .map_bus = xgene_pcie_map_bus,
279 .read = xgene_pcie_config_read32,
280 .write = pci_generic_config_write,
281 }
282};
283#endif
284
285#if defined(CONFIG_PCI_XGENE)
286static u64 xgene_pcie_set_ib_mask(struct xgene_pcie_port *port, u32 addr,
287 u32 flags, u64 size)
288{
289 u64 mask = (~(size - 1) & PCI_BASE_ADDRESS_MEM_MASK) | flags;
290 u32 val32 = 0;
291 u32 val;
292
293 val32 = xgene_pcie_readl(port, addr);
294 val = (val32 & 0x0000ffff) | (lower_32_bits(mask) << 16);
295 xgene_pcie_writel(port, addr, val);
296
297 val32 = xgene_pcie_readl(port, addr + 0x04);
298 val = (val32 & 0xffff0000) | (lower_32_bits(mask) >> 16);
299 xgene_pcie_writel(port, addr + 0x04, val);
300
301 val32 = xgene_pcie_readl(port, addr + 0x04);
302 val = (val32 & 0x0000ffff) | (upper_32_bits(mask) << 16);
303 xgene_pcie_writel(port, addr + 0x04, val);
304
305 val32 = xgene_pcie_readl(port, addr + 0x08);
306 val = (val32 & 0xffff0000) | (upper_32_bits(mask) >> 16);
307 xgene_pcie_writel(port, addr + 0x08, val);
308
309 return mask;
310}
311
312static void xgene_pcie_linkup(struct xgene_pcie_port *port,
313 u32 *lanes, u32 *speed)
314{
315 u32 val32;
316
317 port->link_up = false;
318 val32 = xgene_pcie_readl(port, PCIECORE_CTLANDSTATUS);
319 if (val32 & LINK_UP_MASK) {
320 port->link_up = true;
321 *speed = PIPE_PHY_RATE_RD(val32);
322 val32 = xgene_pcie_readl(port, BRIDGE_STATUS_0);
323 *lanes = val32 >> 26;
324 }
325}
326
327static int xgene_pcie_init_port(struct xgene_pcie_port *port)
328{
329 struct device *dev = port->dev;
330 int rc;
331
332 port->clk = clk_get(dev, NULL);
333 if (IS_ERR(port->clk)) {
334 dev_err(dev, "clock not available\n");
335 return -ENODEV;
336 }
337
338 rc = clk_prepare_enable(port->clk);
339 if (rc) {
340 dev_err(dev, "clock enable failed\n");
341 return rc;
342 }
343
344 return 0;
345}
346
347static int xgene_pcie_map_reg(struct xgene_pcie_port *port,
348 struct platform_device *pdev)
349{
350 struct device *dev = port->dev;
351 struct resource *res;
352
353 res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "csr");
354 port->csr_base = devm_pci_remap_cfg_resource(dev, res);
355 if (IS_ERR(port->csr_base))
356 return PTR_ERR(port->csr_base);
357
358 res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "cfg");
359 port->cfg_base = devm_ioremap_resource(dev, res);
360 if (IS_ERR(port->cfg_base))
361 return PTR_ERR(port->cfg_base);
362 port->cfg_addr = res->start;
363
364 return 0;
365}
366
367static void xgene_pcie_setup_ob_reg(struct xgene_pcie_port *port,
368 struct resource *res, u32 offset,
369 u64 cpu_addr, u64 pci_addr)
370{
371 struct device *dev = port->dev;
372 resource_size_t size = resource_size(res);
373 u64 restype = resource_type(res);
374 u64 mask = 0;
375 u32 min_size;
376 u32 flag = EN_REG;
377
378 if (restype == IORESOURCE_MEM) {
379 min_size = SZ_128M;
380 } else {
381 min_size = 128;
382 flag |= OB_LO_IO;
383 }
384
385 if (size >= min_size)
386 mask = ~(size - 1) | flag;
387 else
388 dev_warn(dev, "res size 0x%llx less than minimum 0x%x\n",
389 (u64)size, min_size);
390
391 xgene_pcie_writel(port, offset, lower_32_bits(cpu_addr));
392 xgene_pcie_writel(port, offset + 0x04, upper_32_bits(cpu_addr));
393 xgene_pcie_writel(port, offset + 0x08, lower_32_bits(mask));
394 xgene_pcie_writel(port, offset + 0x0c, upper_32_bits(mask));
395 xgene_pcie_writel(port, offset + 0x10, lower_32_bits(pci_addr));
396 xgene_pcie_writel(port, offset + 0x14, upper_32_bits(pci_addr));
397}
398
399static void xgene_pcie_setup_cfg_reg(struct xgene_pcie_port *port)
400{
401 u64 addr = port->cfg_addr;
402
403 xgene_pcie_writel(port, CFGBARL, lower_32_bits(addr));
404 xgene_pcie_writel(port, CFGBARH, upper_32_bits(addr));
405 xgene_pcie_writel(port, CFGCTL, EN_REG);
406}
407
408static int xgene_pcie_map_ranges(struct xgene_pcie_port *port,
409 struct list_head *res,
410 resource_size_t io_base)
411{
412 struct resource_entry *window;
413 struct device *dev = port->dev;
414 int ret;
415
416 resource_list_for_each_entry(window, res) {
417 struct resource *res = window->res;
418 u64 restype = resource_type(res);
419
420 dev_dbg(dev, "%pR\n", res);
421
422 switch (restype) {
423 case IORESOURCE_IO:
424 xgene_pcie_setup_ob_reg(port, res, OMR3BARL, io_base,
425 res->start - window->offset);
426 ret = devm_pci_remap_iospace(dev, res, io_base);
427 if (ret < 0)
428 return ret;
429 break;
430 case IORESOURCE_MEM:
431 if (res->flags & IORESOURCE_PREFETCH)
432 xgene_pcie_setup_ob_reg(port, res, OMR2BARL,
433 res->start,
434 res->start -
435 window->offset);
436 else
437 xgene_pcie_setup_ob_reg(port, res, OMR1BARL,
438 res->start,
439 res->start -
440 window->offset);
441 break;
442 case IORESOURCE_BUS:
443 break;
444 default:
445 dev_err(dev, "invalid resource %pR\n", res);
446 return -EINVAL;
447 }
448 }
449 xgene_pcie_setup_cfg_reg(port);
450 return 0;
451}
452
453static void xgene_pcie_setup_pims(struct xgene_pcie_port *port, u32 pim_reg,
454 u64 pim, u64 size)
455{
456 xgene_pcie_writel(port, pim_reg, lower_32_bits(pim));
457 xgene_pcie_writel(port, pim_reg + 0x04,
458 upper_32_bits(pim) | EN_COHERENCY);
459 xgene_pcie_writel(port, pim_reg + 0x10, lower_32_bits(size));
460 xgene_pcie_writel(port, pim_reg + 0x14, upper_32_bits(size));
461}
462
463
464
465
466
467static int xgene_pcie_select_ib_reg(u8 *ib_reg_mask, u64 size)
468{
469 if ((size > 4) && (size < SZ_16M) && !(*ib_reg_mask & (1 << 1))) {
470 *ib_reg_mask |= (1 << 1);
471 return 1;
472 }
473
474 if ((size > SZ_1K) && (size < SZ_1T) && !(*ib_reg_mask & (1 << 0))) {
475 *ib_reg_mask |= (1 << 0);
476 return 0;
477 }
478
479 if ((size > SZ_1M) && (size < SZ_1T) && !(*ib_reg_mask & (1 << 2))) {
480 *ib_reg_mask |= (1 << 2);
481 return 2;
482 }
483
484 return -EINVAL;
485}
486
487static void xgene_pcie_setup_ib_reg(struct xgene_pcie_port *port,
488 struct of_pci_range *range, u8 *ib_reg_mask)
489{
490 void __iomem *cfg_base = port->cfg_base;
491 struct device *dev = port->dev;
492 void *bar_addr;
493 u32 pim_reg;
494 u64 cpu_addr = range->cpu_addr;
495 u64 pci_addr = range->pci_addr;
496 u64 size = range->size;
497 u64 mask = ~(size - 1) | EN_REG;
498 u32 flags = PCI_BASE_ADDRESS_MEM_TYPE_64;
499 u32 bar_low;
500 int region;
501
502 region = xgene_pcie_select_ib_reg(ib_reg_mask, range->size);
503 if (region < 0) {
504 dev_warn(dev, "invalid pcie dma-range config\n");
505 return;
506 }
507
508 if (range->flags & IORESOURCE_PREFETCH)
509 flags |= PCI_BASE_ADDRESS_MEM_PREFETCH;
510
511 bar_low = pcie_bar_low_val((u32)cpu_addr, flags);
512 switch (region) {
513 case 0:
514 xgene_pcie_set_ib_mask(port, BRIDGE_CFG_4, flags, size);
515 bar_addr = cfg_base + PCI_BASE_ADDRESS_0;
516 writel(bar_low, bar_addr);
517 writel(upper_32_bits(cpu_addr), bar_addr + 0x4);
518 pim_reg = PIM1_1L;
519 break;
520 case 1:
521 xgene_pcie_writel(port, IBAR2, bar_low);
522 xgene_pcie_writel(port, IR2MSK, lower_32_bits(mask));
523 pim_reg = PIM2_1L;
524 break;
525 case 2:
526 xgene_pcie_writel(port, IBAR3L, bar_low);
527 xgene_pcie_writel(port, IBAR3L + 0x4, upper_32_bits(cpu_addr));
528 xgene_pcie_writel(port, IR3MSKL, lower_32_bits(mask));
529 xgene_pcie_writel(port, IR3MSKL + 0x4, upper_32_bits(mask));
530 pim_reg = PIM3_1L;
531 break;
532 }
533
534 xgene_pcie_setup_pims(port, pim_reg, pci_addr, ~(size - 1));
535}
536
537static int xgene_pcie_parse_map_dma_ranges(struct xgene_pcie_port *port)
538{
539 struct device_node *np = port->node;
540 struct of_pci_range range;
541 struct of_pci_range_parser parser;
542 struct device *dev = port->dev;
543 u8 ib_reg_mask = 0;
544
545 if (of_pci_dma_range_parser_init(&parser, np)) {
546 dev_err(dev, "missing dma-ranges property\n");
547 return -EINVAL;
548 }
549
550
551 for_each_of_pci_range(&parser, &range) {
552 u64 end = range.cpu_addr + range.size - 1;
553
554 dev_dbg(dev, "0x%08x 0x%016llx..0x%016llx -> 0x%016llx\n",
555 range.flags, range.cpu_addr, end, range.pci_addr);
556 xgene_pcie_setup_ib_reg(port, &range, &ib_reg_mask);
557 }
558 return 0;
559}
560
561
562static void xgene_pcie_clear_config(struct xgene_pcie_port *port)
563{
564 int i;
565
566 for (i = PIM1_1L; i <= CFGCTL; i += 4)
567 xgene_pcie_writel(port, i, 0);
568}
569
570static int xgene_pcie_setup(struct xgene_pcie_port *port, struct list_head *res,
571 resource_size_t io_base)
572{
573 struct device *dev = port->dev;
574 u32 val, lanes = 0, speed = 0;
575 int ret;
576
577 xgene_pcie_clear_config(port);
578
579
580 val = (XGENE_PCIE_DEVICEID << 16) | XGENE_PCIE_VENDORID;
581 xgene_pcie_writel(port, BRIDGE_CFG_0, val);
582
583 ret = xgene_pcie_map_ranges(port, res, io_base);
584 if (ret)
585 return ret;
586
587 ret = xgene_pcie_parse_map_dma_ranges(port);
588 if (ret)
589 return ret;
590
591 xgene_pcie_linkup(port, &lanes, &speed);
592 if (!port->link_up)
593 dev_info(dev, "(rc) link down\n");
594 else
595 dev_info(dev, "(rc) x%d gen-%d link up\n", lanes, speed + 1);
596 return 0;
597}
598
599static struct pci_ops xgene_pcie_ops = {
600 .map_bus = xgene_pcie_map_bus,
601 .read = xgene_pcie_config_read32,
602 .write = pci_generic_config_write32,
603};
604
605static int xgene_pcie_probe(struct platform_device *pdev)
606{
607 struct device *dev = &pdev->dev;
608 struct device_node *dn = dev->of_node;
609 struct xgene_pcie_port *port;
610 resource_size_t iobase = 0;
611 struct pci_bus *bus, *child;
612 struct pci_host_bridge *bridge;
613 int ret;
614 LIST_HEAD(res);
615
616 bridge = devm_pci_alloc_host_bridge(dev, sizeof(*port));
617 if (!bridge)
618 return -ENOMEM;
619
620 port = pci_host_bridge_priv(bridge);
621
622 port->node = of_node_get(dn);
623 port->dev = dev;
624
625 port->version = XGENE_PCIE_IP_VER_UNKN;
626 if (of_device_is_compatible(port->node, "apm,xgene-pcie"))
627 port->version = XGENE_PCIE_IP_VER_1;
628
629 ret = xgene_pcie_map_reg(port, pdev);
630 if (ret)
631 return ret;
632
633 ret = xgene_pcie_init_port(port);
634 if (ret)
635 return ret;
636
637 ret = devm_of_pci_get_host_bridge_resources(dev, 0, 0xff, &res,
638 &iobase);
639 if (ret)
640 return ret;
641
642 ret = devm_request_pci_bus_resources(dev, &res);
643 if (ret)
644 goto error;
645
646 ret = xgene_pcie_setup(port, &res, iobase);
647 if (ret)
648 goto error;
649
650 list_splice_init(&res, &bridge->windows);
651 bridge->dev.parent = dev;
652 bridge->sysdata = port;
653 bridge->busnr = 0;
654 bridge->ops = &xgene_pcie_ops;
655 bridge->map_irq = of_irq_parse_and_map_pci;
656 bridge->swizzle_irq = pci_common_swizzle;
657
658 ret = pci_scan_root_bus_bridge(bridge);
659 if (ret < 0)
660 goto error;
661
662 bus = bridge->bus;
663
664 pci_assign_unassigned_bus_resources(bus);
665 list_for_each_entry(child, &bus->children, node)
666 pcie_bus_configure_settings(child);
667 pci_bus_add_devices(bus);
668 return 0;
669
670error:
671 pci_free_resource_list(&res);
672 return ret;
673}
674
675static const struct of_device_id xgene_pcie_match_table[] = {
676 {.compatible = "apm,xgene-pcie",},
677 {},
678};
679
680static struct platform_driver xgene_pcie_driver = {
681 .driver = {
682 .name = "xgene-pcie",
683 .of_match_table = of_match_ptr(xgene_pcie_match_table),
684 .suppress_bind_attrs = true,
685 },
686 .probe = xgene_pcie_probe,
687};
688builtin_platform_driver(xgene_pcie_driver);
689#endif
690
