xref: /openbmc/u-boot/drivers/pci/pcie_dw_mvebu.c (revision 3f75e0ce)
1 /*
2  * Copyright (C) 2015 Marvell International Ltd.
3  *
4  * Copyright (C) 2016 Stefan Roese <sr@denx.de>
5  *
6  * Based on:
7  *   - drivers/pci/pcie_imx.c
8  *   - drivers/pci/pci_mvebu.c
9  *   - drivers/pci/pcie_xilinx.c
10  *
11  * SPDX-License-Identifier:	GPL-2.0+
12  */
13 
14 #include <common.h>
15 #include <dm.h>
16 #include <pci.h>
17 #include <asm/io.h>
18 #include <asm-generic/gpio.h>
19 
20 DECLARE_GLOBAL_DATA_PTR;
21 
22 /* PCI Config space registers */
23 #define PCIE_CONFIG_BAR0		0x10
24 #define PCIE_LINK_STATUS_REG		0x80
25 #define PCIE_LINK_STATUS_SPEED_OFF	16
26 #define PCIE_LINK_STATUS_SPEED_MASK	(0xf << PCIE_LINK_STATUS_SPEED_OFF)
27 #define PCIE_LINK_STATUS_WIDTH_OFF	20
28 #define PCIE_LINK_STATUS_WIDTH_MASK	(0xf << PCIE_LINK_STATUS_WIDTH_OFF)
29 
30 /* Resizable bar capability registers */
31 #define RESIZABLE_BAR_CAP		0x250
32 #define RESIZABLE_BAR_CTL0		0x254
33 #define RESIZABLE_BAR_CTL1		0x258
34 
35 /* iATU registers */
36 #define PCIE_ATU_VIEWPORT		0x900
37 #define PCIE_ATU_REGION_INBOUND		(0x1 << 31)
38 #define PCIE_ATU_REGION_OUTBOUND	(0x0 << 31)
39 #define PCIE_ATU_REGION_INDEX1		(0x1 << 0)
40 #define PCIE_ATU_REGION_INDEX0		(0x0 << 0)
41 #define PCIE_ATU_CR1			0x904
42 #define PCIE_ATU_TYPE_MEM		(0x0 << 0)
43 #define PCIE_ATU_TYPE_IO		(0x2 << 0)
44 #define PCIE_ATU_TYPE_CFG0		(0x4 << 0)
45 #define PCIE_ATU_TYPE_CFG1		(0x5 << 0)
46 #define PCIE_ATU_CR2			0x908
47 #define PCIE_ATU_ENABLE			(0x1 << 31)
48 #define PCIE_ATU_BAR_MODE_ENABLE	(0x1 << 30)
49 #define PCIE_ATU_LOWER_BASE		0x90C
50 #define PCIE_ATU_UPPER_BASE		0x910
51 #define PCIE_ATU_LIMIT			0x914
52 #define PCIE_ATU_LOWER_TARGET		0x918
53 #define PCIE_ATU_BUS(x)			(((x) & 0xff) << 24)
54 #define PCIE_ATU_DEV(x)			(((x) & 0x1f) << 19)
55 #define PCIE_ATU_FUNC(x)		(((x) & 0x7) << 16)
56 #define PCIE_ATU_UPPER_TARGET		0x91C
57 
58 #define PCIE_LINK_CAPABILITY		0x7C
59 #define PCIE_LINK_CTL_2			0xA0
60 #define TARGET_LINK_SPEED_MASK		0xF
61 #define LINK_SPEED_GEN_1		0x1
62 #define LINK_SPEED_GEN_2		0x2
63 #define LINK_SPEED_GEN_3		0x3
64 
65 #define PCIE_GEN3_RELATED		0x890
66 #define GEN3_EQU_DISABLE		(1 << 16)
67 #define GEN3_ZRXDC_NON_COMP		(1 << 0)
68 
69 #define PCIE_GEN3_EQU_CTRL		0x8A8
70 #define GEN3_EQU_EVAL_2MS_DISABLE	(1 << 5)
71 
72 #define PCIE_ROOT_COMPLEX_MODE_MASK	(0xF << 4)
73 
74 #define PCIE_LINK_UP_TIMEOUT_MS		100
75 
76 #define PCIE_GLOBAL_CONTROL		0x8000
77 #define PCIE_APP_LTSSM_EN		(1 << 2)
78 #define PCIE_DEVICE_TYPE_OFFSET		(4)
79 #define PCIE_DEVICE_TYPE_MASK		(0xF)
80 #define PCIE_DEVICE_TYPE_EP		(0x0) /* Endpoint */
81 #define PCIE_DEVICE_TYPE_LEP		(0x1) /* Legacy endpoint */
82 #define PCIE_DEVICE_TYPE_RC		(0x4) /* Root complex */
83 
84 #define PCIE_GLOBAL_STATUS		0x8008
85 #define PCIE_GLB_STS_RDLH_LINK_UP	(1 << 1)
86 #define PCIE_GLB_STS_PHY_LINK_UP	(1 << 9)
87 
88 #define PCIE_ARCACHE_TRC		0x8050
89 #define PCIE_AWCACHE_TRC		0x8054
90 #define ARCACHE_SHAREABLE_CACHEABLE	0x3511
91 #define AWCACHE_SHAREABLE_CACHEABLE	0x5311
92 
93 #define LINK_SPEED_GEN_1                0x1
94 #define LINK_SPEED_GEN_2                0x2
95 #define LINK_SPEED_GEN_3                0x3
96 
97 /**
98  * struct pcie_dw_mvebu - MVEBU DW PCIe controller state
99  *
100  * @ctrl_base: The base address of the register space
101  * @cfg_base: The base address of the configuration space
102  * @cfg_size: The size of the configuration space which is needed
103  *            as it gets written into the PCIE_ATU_LIMIT register
104  * @first_busno: This driver supports multiple PCIe controllers.
105  *               first_busno stores the bus number of the PCIe root-port
106  *               number which may vary depending on the PCIe setup
107  *               (PEX switches etc).
108  */
109 struct pcie_dw_mvebu {
110 	void *ctrl_base;
111 	void *cfg_base;
112 	fdt_size_t cfg_size;
113 	int first_busno;
114 };
115 
116 static int pcie_dw_get_link_speed(const void *regs_base)
117 {
118 	return (readl(regs_base + PCIE_LINK_STATUS_REG) &
119 		PCIE_LINK_STATUS_SPEED_MASK) >> PCIE_LINK_STATUS_SPEED_OFF;
120 }
121 
122 static int pcie_dw_get_link_width(const void *regs_base)
123 {
124 	return (readl(regs_base + PCIE_LINK_STATUS_REG) &
125 		PCIE_LINK_STATUS_WIDTH_MASK) >> PCIE_LINK_STATUS_WIDTH_OFF;
126 }
127 
128 /**
129  * set_cfg_address() - Configure the PCIe controller config space access
130  *
131  * @pcie: Pointer to the PCI controller state
132  * @d: PCI device to access
133  * @where: Offset in the configuration space
134  *
135  * Configures the PCIe controller to access the configuration space of
136  * a specific PCIe device and returns the address to use for this
137  * access.
138  *
139  * Return: Address that can be used to access the configation space
140  *         of the requested device / offset
141  */
142 static uintptr_t set_cfg_address(struct pcie_dw_mvebu *pcie,
143 				 pci_dev_t d, uint where)
144 {
145 	uintptr_t va_address;
146 
147 	/*
148 	 * Region #0 is used for Outbound CFG space access.
149 	 * Direction = Outbound
150 	 * Region Index = 0
151 	 */
152 	writel(0, pcie->ctrl_base + PCIE_ATU_VIEWPORT);
153 
154 	if (PCI_BUS(d) == (pcie->first_busno + 1))
155 		/* For local bus, change TLP Type field to 4. */
156 		writel(PCIE_ATU_TYPE_CFG0, pcie->ctrl_base + PCIE_ATU_CR1);
157 	else
158 		/* Otherwise, change TLP Type field to 5. */
159 		writel(PCIE_ATU_TYPE_CFG1, pcie->ctrl_base + PCIE_ATU_CR1);
160 
161 	if (PCI_BUS(d) == pcie->first_busno) {
162 		/* Accessing root port configuration space. */
163 		va_address = (uintptr_t)pcie->ctrl_base;
164 	} else {
165 		writel(d << 8, pcie->ctrl_base + PCIE_ATU_LOWER_TARGET);
166 		va_address = (uintptr_t)pcie->cfg_base;
167 	}
168 
169 	va_address += where & ~0x3;
170 
171 	return va_address;
172 }
173 
174 /**
175  * pcie_dw_addr_valid() - Check for valid bus address
176  *
177  * @d: The PCI device to access
178  * @first_busno: Bus number of the PCIe controller root complex
179  *
180  * Return 1 (true) if the PCI device can be accessed by this controller.
181  *
182  * Return: 1 on valid, 0 on invalid
183  */
184 static int pcie_dw_addr_valid(pci_dev_t d, int first_busno)
185 {
186 	if ((PCI_BUS(d) == first_busno) && (PCI_DEV(d) > 0))
187 		return 0;
188 	if ((PCI_BUS(d) == first_busno + 1) && (PCI_DEV(d) > 0))
189 		return 0;
190 
191 	return 1;
192 }
193 
194 /**
195  * pcie_dw_mvebu_read_config() - Read from configuration space
196  *
197  * @bus: Pointer to the PCI bus
198  * @bdf: Identifies the PCIe device to access
199  * @offset: The offset into the device's configuration space
200  * @valuep: A pointer at which to store the read value
201  * @size: Indicates the size of access to perform
202  *
203  * Read a value of size @size from offset @offset within the configuration
204  * space of the device identified by the bus, device & function numbers in @bdf
205  * on the PCI bus @bus.
206  *
207  * Return: 0 on success
208  */
209 static int pcie_dw_mvebu_read_config(struct udevice *bus, pci_dev_t bdf,
210 				     uint offset, ulong *valuep,
211 				     enum pci_size_t size)
212 {
213 	struct pcie_dw_mvebu *pcie = dev_get_priv(bus);
214 	uintptr_t va_address;
215 	ulong value;
216 
217 	debug("PCIE CFG read:  (b,d,f)=(%2d,%2d,%2d) ",
218 	      PCI_BUS(bdf), PCI_DEV(bdf), PCI_FUNC(bdf));
219 
220 	if (!pcie_dw_addr_valid(bdf, pcie->first_busno)) {
221 		debug("- out of range\n");
222 		*valuep = pci_get_ff(size);
223 		return 0;
224 	}
225 
226 	va_address = set_cfg_address(pcie, bdf, offset);
227 
228 	value = readl(va_address);
229 
230 	debug("(addr,val)=(0x%04x, 0x%08lx)\n", offset, value);
231 	*valuep = pci_conv_32_to_size(value, offset, size);
232 
233 	return 0;
234 }
235 
236 /**
237  * pcie_dw_mvebu_write_config() - Write to configuration space
238  *
239  * @bus: Pointer to the PCI bus
240  * @bdf: Identifies the PCIe device to access
241  * @offset: The offset into the device's configuration space
242  * @value: The value to write
243  * @size: Indicates the size of access to perform
244  *
245  * Write the value @value of size @size from offset @offset within the
246  * configuration space of the device identified by the bus, device & function
247  * numbers in @bdf on the PCI bus @bus.
248  *
249  * Return: 0 on success
250  */
251 static int pcie_dw_mvebu_write_config(struct udevice *bus, pci_dev_t bdf,
252 				      uint offset, ulong value,
253 				      enum pci_size_t size)
254 {
255 	struct pcie_dw_mvebu *pcie = dev_get_priv(bus);
256 	uintptr_t va_address;
257 	ulong old;
258 
259 	debug("PCIE CFG write: (b,d,f)=(%2d,%2d,%2d) ",
260 	      PCI_BUS(bdf), PCI_DEV(bdf), PCI_FUNC(bdf));
261 	debug("(addr,val)=(0x%04x, 0x%08lx)\n", offset, value);
262 
263 	if (!pcie_dw_addr_valid(bdf, pcie->first_busno)) {
264 		debug("- out of range\n");
265 		return 0;
266 	}
267 
268 	va_address = set_cfg_address(pcie, bdf, offset);
269 
270 	old = readl(va_address);
271 	value = pci_conv_size_to_32(old, value, offset, size);
272 	writel(value, va_address);
273 
274 	return 0;
275 }
276 
277 /**
278  * pcie_dw_configure() - Configure link capabilities and speed
279  *
280  * @regs_base: A pointer to the PCIe controller registers
281  * @cap_speed: The capabilities and speed to configure
282  *
283  * Configure the link capabilities and speed in the PCIe root complex.
284  */
285 static void pcie_dw_configure(const void *regs_base, u32 cap_speed)
286 {
287 	/*
288 	 * TODO (shadi@marvell.com, sr@denx.de):
289 	 * Need to read the serdes speed from the dts and according to it
290 	 * configure the PCIe gen
291 	 */
292 
293 	/* Set link to GEN 3 */
294 	clrsetbits_le32(regs_base + PCIE_LINK_CTL_2,
295 			TARGET_LINK_SPEED_MASK, cap_speed);
296 	clrsetbits_le32(regs_base + PCIE_LINK_CAPABILITY,
297 			TARGET_LINK_SPEED_MASK, cap_speed);
298 	setbits_le32(regs_base + PCIE_GEN3_EQU_CTRL, GEN3_EQU_EVAL_2MS_DISABLE);
299 }
300 
301 /**
302  * is_link_up() - Return the link state
303  *
304  * @regs_base: A pointer to the PCIe controller registers
305  *
306  * Return: 1 (true) for active line and 0 (false) for no link
307  */
308 static int is_link_up(const void *regs_base)
309 {
310 	u32 mask = PCIE_GLB_STS_RDLH_LINK_UP | PCIE_GLB_STS_PHY_LINK_UP;
311 	u32 reg;
312 
313 	reg = readl(regs_base + PCIE_GLOBAL_STATUS);
314 	if ((reg & mask) == mask)
315 		return 1;
316 
317 	return 0;
318 }
319 
320 /**
321  * wait_link_up() - Wait for the link to come up
322  *
323  * @regs_base: A pointer to the PCIe controller registers
324  *
325  * Return: 1 (true) for active line and 0 (false) for no link (timeout)
326  */
327 static int wait_link_up(const void *regs_base)
328 {
329 	unsigned long timeout;
330 
331 	timeout = get_timer(0) + PCIE_LINK_UP_TIMEOUT_MS;
332 	while (!is_link_up(regs_base)) {
333 		if (get_timer(0) > timeout)
334 			return 0;
335 	};
336 
337 	return 1;
338 }
339 
340 /**
341  * pcie_dw_mvebu_pcie_link_up() - Configure the PCIe root port
342  *
343  * @regs_base: A pointer to the PCIe controller registers
344  * @cap_speed: The capabilities and speed to configure
345  *
346  * Configure the PCIe controller root complex depending on the
347  * requested link capabilities and speed.
348  *
349  * Return: 1 (true) for active line and 0 (false) for no link
350  */
351 static int pcie_dw_mvebu_pcie_link_up(const void *regs_base, u32 cap_speed)
352 {
353 	if (!is_link_up(regs_base)) {
354 		/* Disable LTSSM state machine to enable configuration */
355 		clrbits_le32(regs_base + PCIE_GLOBAL_CONTROL,
356 			     PCIE_APP_LTSSM_EN);
357 	}
358 
359 	clrsetbits_le32(regs_base + PCIE_GLOBAL_CONTROL,
360 			PCIE_DEVICE_TYPE_MASK << PCIE_DEVICE_TYPE_OFFSET,
361 			PCIE_DEVICE_TYPE_RC << PCIE_DEVICE_TYPE_OFFSET);
362 
363 	/* Set the PCIe master AXI attributes */
364 	writel(ARCACHE_SHAREABLE_CACHEABLE, regs_base + PCIE_ARCACHE_TRC);
365 	writel(AWCACHE_SHAREABLE_CACHEABLE, regs_base + PCIE_AWCACHE_TRC);
366 
367 	/* DW pre link configurations */
368 	pcie_dw_configure(regs_base, cap_speed);
369 
370 	if (!is_link_up(regs_base)) {
371 		/* Configuration done. Start LTSSM */
372 		setbits_le32(regs_base + PCIE_GLOBAL_CONTROL,
373 			     PCIE_APP_LTSSM_EN);
374 	}
375 
376 	/* Check that link was established */
377 	if (!wait_link_up(regs_base))
378 		return 0;
379 
380 	/*
381 	 * Link can be established in Gen 1. still need to wait
382 	 * till MAC nagaotiation is completed
383 	 */
384 	udelay(100);
385 
386 	return 1;
387 }
388 
389 /**
390  * pcie_dw_regions_setup() - iATU region setup
391  *
392  * @pcie: Pointer to the PCI controller state
393  *
394  * Configure the iATU regions in the PCIe controller for outbound access.
395  */
396 static void pcie_dw_regions_setup(struct pcie_dw_mvebu *pcie)
397 {
398 	/*
399 	 * Region #0 is used for Outbound CFG space access.
400 	 * Direction = Outbound
401 	 * Region Index = 0
402 	 */
403 	writel(0, pcie->ctrl_base + PCIE_ATU_VIEWPORT);
404 
405 	writel((u32)(uintptr_t)pcie->cfg_base, pcie->ctrl_base
406 	       + PCIE_ATU_LOWER_BASE);
407 	writel(0, pcie->ctrl_base + PCIE_ATU_UPPER_BASE);
408 	writel((u32)(uintptr_t)pcie->cfg_base + pcie->cfg_size,
409 	       pcie->ctrl_base + PCIE_ATU_LIMIT);
410 
411 	writel(0, pcie->ctrl_base + PCIE_ATU_LOWER_TARGET);
412 	writel(0, pcie->ctrl_base + PCIE_ATU_UPPER_TARGET);
413 	writel(PCIE_ATU_TYPE_CFG0, pcie->ctrl_base + PCIE_ATU_CR1);
414 	writel(PCIE_ATU_ENABLE, pcie->ctrl_base + PCIE_ATU_CR2);
415 }
416 
417 /**
418  * pcie_dw_set_host_bars() - Configure the host BARs
419  *
420  * @regs_base: A pointer to the PCIe controller registers
421  *
422  * Configure the host BARs of the PCIe controller root port so that
423  * PCI(e) devices may access the system memory.
424  */
425 static void pcie_dw_set_host_bars(const void *regs_base)
426 {
427 	u32 size = gd->ram_size;
428 	u64 max_size;
429 	u32 reg;
430 	u32 bar0;
431 
432 	/* Verify the maximal BAR size */
433 	reg = readl(regs_base + RESIZABLE_BAR_CAP);
434 	max_size = 1ULL << (5 + (reg + (1 << 4)));
435 
436 	if (size > max_size) {
437 		size = max_size;
438 		printf("Warning: PCIe BARs can't map all DRAM space\n");
439 	}
440 
441 	/* Set the BAR base and size towards DDR */
442 	bar0 = CONFIG_SYS_SDRAM_BASE & ~0xf;
443 	bar0 |= PCI_BASE_ADDRESS_MEM_TYPE_32;
444 	writel(CONFIG_SYS_SDRAM_BASE, regs_base + PCIE_CONFIG_BAR0);
445 
446 	reg = ((size >> 20) - 1) << 12;
447 	writel(size, regs_base + RESIZABLE_BAR_CTL0);
448 }
449 
450 /**
451  * pcie_dw_mvebu_probe() - Probe the PCIe bus for active link
452  *
453  * @dev: A pointer to the device being operated on
454  *
455  * Probe for an active link on the PCIe bus and configure the controller
456  * to enable this port.
457  *
458  * Return: 0 on success, else -ENODEV
459  */
460 static int pcie_dw_mvebu_probe(struct udevice *dev)
461 {
462 	struct pcie_dw_mvebu *pcie = dev_get_priv(dev);
463 	struct udevice *ctlr = pci_get_controller(dev);
464 	struct pci_controller *hose = dev_get_uclass_priv(ctlr);
465 #ifdef CONFIG_DM_GPIO
466 	struct gpio_desc reset_gpio;
467 
468 	gpio_request_by_name(dev, "marvell,reset-gpio", 0, &reset_gpio,
469 			     GPIOD_IS_OUT);
470 	/*
471 	 * Issue reset to add-in card trough the dedicated GPIO.
472 	 * Some boards are connecting the card reset pin to common system
473 	 * reset wire and others are using separate GPIO port.
474 	 * In the last case we have to release a reset of the addon card
475 	 * using this GPIO.
476 	 */
477 	if (dm_gpio_is_valid(&reset_gpio)) {
478 		dm_gpio_set_value(&reset_gpio, 1);
479 		mdelay(200);
480 	}
481 #else
482 	debug("PCIE Reset on GPIO support is missing\n");
483 #endif /* CONFIG_DM_GPIO */
484 
485 	pcie->first_busno = dev->seq;
486 
487 	/* Don't register host if link is down */
488 	if (!pcie_dw_mvebu_pcie_link_up(pcie->ctrl_base, LINK_SPEED_GEN_3)) {
489 		printf("PCIE-%d: Link down\n", dev->seq);
490 	} else {
491 		printf("PCIE-%d: Link up (Gen%d-x%d, Bus%d)\n", dev->seq,
492 		       pcie_dw_get_link_speed(pcie->ctrl_base),
493 		       pcie_dw_get_link_width(pcie->ctrl_base),
494 		       hose->first_busno);
495 	}
496 
497 	pcie_dw_regions_setup(pcie);
498 
499 	/* Set the CLASS_REV of RC CFG header to PCI_CLASS_BRIDGE_PCI */
500 	clrsetbits_le32(pcie->ctrl_base + PCI_CLASS_REVISION,
501 			0xffff << 16, PCI_CLASS_BRIDGE_PCI << 16);
502 
503 	pcie_dw_set_host_bars(pcie->ctrl_base);
504 
505 	return 0;
506 }
507 
508 /**
509  * pcie_dw_mvebu_ofdata_to_platdata() - Translate from DT to device state
510  *
511  * @dev: A pointer to the device being operated on
512  *
513  * Translate relevant data from the device tree pertaining to device @dev into
514  * state that the driver will later make use of. This state is stored in the
515  * device's private data structure.
516  *
517  * Return: 0 on success, else -EINVAL
518  */
519 static int pcie_dw_mvebu_ofdata_to_platdata(struct udevice *dev)
520 {
521 	struct pcie_dw_mvebu *pcie = dev_get_priv(dev);
522 
523 	/* Get the controller base address */
524 	pcie->ctrl_base = (void *)dev_get_addr_index(dev, 0);
525 	if ((fdt_addr_t)pcie->ctrl_base == FDT_ADDR_T_NONE)
526 		return -EINVAL;
527 
528 	/* Get the config space base address and size */
529 	pcie->cfg_base = (void *)dev_get_addr_size_index(dev, 1,
530 							 &pcie->cfg_size);
531 	if ((fdt_addr_t)pcie->cfg_base == FDT_ADDR_T_NONE)
532 		return -EINVAL;
533 
534 	return 0;
535 }
536 
537 static const struct dm_pci_ops pcie_dw_mvebu_ops = {
538 	.read_config	= pcie_dw_mvebu_read_config,
539 	.write_config	= pcie_dw_mvebu_write_config,
540 };
541 
542 static const struct udevice_id pcie_dw_mvebu_ids[] = {
543 	{ .compatible = "marvell,armada8k-pcie" },
544 	{ }
545 };
546 
547 U_BOOT_DRIVER(pcie_dw_mvebu) = {
548 	.name			= "pcie_dw_mvebu",
549 	.id			= UCLASS_PCI,
550 	.of_match		= pcie_dw_mvebu_ids,
551 	.ops			= &pcie_dw_mvebu_ops,
552 	.ofdata_to_platdata	= pcie_dw_mvebu_ofdata_to_platdata,
553 	.probe			= pcie_dw_mvebu_probe,
554 	.priv_auto_alloc_size	= sizeof(struct pcie_dw_mvebu),
555 };
556