1 /*
2 * ***************************************************************************
3 * Copyright (C) 2015 Marvell International Ltd.
4 * ***************************************************************************
5 * This program is free software: you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License as published by the Free
7 * Software Foundation, either version 2 of the License, or any later version.
8 *
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with this program. If not, see <http://www.gnu.org/licenses/>.
16 * ***************************************************************************
17 */
18 /* pcie_advk.c
19 *
20 * Ported from Linux driver - driver/pci/host/pci-aardvark.c
21 *
22 * Author: Victor Gu <xigu@marvell.com>
23 * Hezi Shahmoon <hezi.shahmoon@marvell.com>
24 *
25 */
26
27 #include <common.h>
28 #include <dm.h>
29 #include <pci.h>
30 #include <asm/io.h>
31 #include <asm-generic/gpio.h>
32 #include <linux/ioport.h>
33
34 /* PCIe core registers */
35 #define PCIE_CORE_CMD_STATUS_REG 0x4
36 #define PCIE_CORE_CMD_IO_ACCESS_EN BIT(0)
37 #define PCIE_CORE_CMD_MEM_ACCESS_EN BIT(1)
38 #define PCIE_CORE_CMD_MEM_IO_REQ_EN BIT(2)
39 #define PCIE_CORE_DEV_CTRL_STATS_REG 0xc8
40 #define PCIE_CORE_DEV_CTRL_STATS_RELAX_ORDER_DISABLE (0 << 4)
41 #define PCIE_CORE_DEV_CTRL_STATS_SNOOP_DISABLE (0 << 11)
42 #define PCIE_CORE_LINK_CTRL_STAT_REG 0xd0
43 #define PCIE_CORE_LINK_TRAINING BIT(5)
44 #define PCIE_CORE_ERR_CAPCTL_REG 0x118
45 #define PCIE_CORE_ERR_CAPCTL_ECRC_CHK_TX BIT(5)
46 #define PCIE_CORE_ERR_CAPCTL_ECRC_CHK_TX_EN BIT(6)
47 #define PCIE_CORE_ERR_CAPCTL_ECRC_CHECK BIT(7)
48 #define PCIE_CORE_ERR_CAPCTL_ECRC_CHECK_RCV BIT(8)
49
50 /* PIO registers base address and register offsets */
51 #define PIO_BASE_ADDR 0x4000
52 #define PIO_CTRL (PIO_BASE_ADDR + 0x0)
53 #define PIO_CTRL_TYPE_MASK GENMASK(3, 0)
54 #define PIO_CTRL_ADDR_WIN_DISABLE BIT(24)
55 #define PIO_STAT (PIO_BASE_ADDR + 0x4)
56 #define PIO_COMPLETION_STATUS_SHIFT 7
57 #define PIO_COMPLETION_STATUS_MASK GENMASK(9, 7)
58 #define PIO_COMPLETION_STATUS_OK 0
59 #define PIO_COMPLETION_STATUS_UR 1
60 #define PIO_COMPLETION_STATUS_CRS 2
61 #define PIO_COMPLETION_STATUS_CA 4
62 #define PIO_NON_POSTED_REQ BIT(10)
63 #define PIO_ERR_STATUS BIT(11)
64 #define PIO_ADDR_LS (PIO_BASE_ADDR + 0x8)
65 #define PIO_ADDR_MS (PIO_BASE_ADDR + 0xc)
66 #define PIO_WR_DATA (PIO_BASE_ADDR + 0x10)
67 #define PIO_WR_DATA_STRB (PIO_BASE_ADDR + 0x14)
68 #define PIO_RD_DATA (PIO_BASE_ADDR + 0x18)
69 #define PIO_START (PIO_BASE_ADDR + 0x1c)
70 #define PIO_ISR (PIO_BASE_ADDR + 0x20)
71
72 /* Aardvark Control registers */
73 #define CONTROL_BASE_ADDR 0x4800
74 #define PCIE_CORE_CTRL0_REG (CONTROL_BASE_ADDR + 0x0)
75 #define PCIE_GEN_SEL_MSK 0x3
76 #define PCIE_GEN_SEL_SHIFT 0x0
77 #define SPEED_GEN_1 0
78 #define SPEED_GEN_2 1
79 #define SPEED_GEN_3 2
80 #define IS_RC_MSK 1
81 #define IS_RC_SHIFT 2
82 #define LANE_CNT_MSK 0x18
83 #define LANE_CNT_SHIFT 0x3
84 #define LANE_COUNT_1 (0 << LANE_CNT_SHIFT)
85 #define LANE_COUNT_2 (1 << LANE_CNT_SHIFT)
86 #define LANE_COUNT_4 (2 << LANE_CNT_SHIFT)
87 #define LANE_COUNT_8 (3 << LANE_CNT_SHIFT)
88 #define LINK_TRAINING_EN BIT(6)
89 #define PCIE_CORE_CTRL2_REG (CONTROL_BASE_ADDR + 0x8)
90 #define PCIE_CORE_CTRL2_RESERVED 0x7
91 #define PCIE_CORE_CTRL2_TD_ENABLE BIT(4)
92 #define PCIE_CORE_CTRL2_STRICT_ORDER_ENABLE BIT(5)
93 #define PCIE_CORE_CTRL2_ADDRWIN_MAP_ENABLE BIT(6)
94
95 /* LMI registers base address and register offsets */
96 #define LMI_BASE_ADDR 0x6000
97 #define CFG_REG (LMI_BASE_ADDR + 0x0)
98 #define LTSSM_SHIFT 24
99 #define LTSSM_MASK 0x3f
100 #define LTSSM_L0 0x10
101
102 /* PCIe core controller registers */
103 #define CTRL_CORE_BASE_ADDR 0x18000
104 #define CTRL_CONFIG_REG (CTRL_CORE_BASE_ADDR + 0x0)
105 #define CTRL_MODE_SHIFT 0x0
106 #define CTRL_MODE_MASK 0x1
107 #define PCIE_CORE_MODE_DIRECT 0x0
108 #define PCIE_CORE_MODE_COMMAND 0x1
109
110 /* Transaction types */
111 #define PCIE_CONFIG_RD_TYPE0 0x8
112 #define PCIE_CONFIG_RD_TYPE1 0x9
113 #define PCIE_CONFIG_WR_TYPE0 0xa
114 #define PCIE_CONFIG_WR_TYPE1 0xb
115
116 /* PCI_BDF shifts 8bit, so we need extra 4bit shift */
117 #define PCIE_BDF(dev) (dev << 4)
118 #define PCIE_CONF_BUS(bus) (((bus) & 0xff) << 20)
119 #define PCIE_CONF_DEV(dev) (((dev) & 0x1f) << 15)
120 #define PCIE_CONF_FUNC(fun) (((fun) & 0x7) << 12)
121 #define PCIE_CONF_REG(reg) ((reg) & 0xffc)
122 #define PCIE_CONF_ADDR(bus, devfn, where) \
123 (PCIE_CONF_BUS(bus) | PCIE_CONF_DEV(PCI_SLOT(devfn)) | \
124 PCIE_CONF_FUNC(PCI_FUNC(devfn)) | PCIE_CONF_REG(where))
125
126 /* PCIe Retries & Timeout definitions */
127 #define MAX_RETRIES 10
128 #define PIO_WAIT_TIMEOUT 100
129 #define LINK_WAIT_TIMEOUT 100000
130
131 #define CFG_RD_UR_VAL 0xFFFFFFFF
132 #define CFG_RD_CRS_VAL 0xFFFF0001
133
134 /**
135 * struct pcie_advk - Advk PCIe controller state
136 *
137 * @reg_base: The base address of the register space.
138 * @first_busno: This driver supports multiple PCIe controllers.
139 * first_busno stores the bus number of the PCIe root-port
140 * number which may vary depending on the PCIe setup
141 * (PEX switches etc).
142 * @device: The pointer to PCI uclass device.
143 */
144 struct pcie_advk {
145 void *base;
146 int first_busno;
147 struct udevice *dev;
148 };
149
advk_writel(struct pcie_advk * pcie,uint val,uint reg)150 static inline void advk_writel(struct pcie_advk *pcie, uint val, uint reg)
151 {
152 writel(val, pcie->base + reg);
153 }
154
advk_readl(struct pcie_advk * pcie,uint reg)155 static inline uint advk_readl(struct pcie_advk *pcie, uint reg)
156 {
157 return readl(pcie->base + reg);
158 }
159
160 /**
161 * pcie_advk_addr_valid() - Check for valid bus address
162 *
163 * @bdf: The PCI device to access
164 * @first_busno: Bus number of the PCIe controller root complex
165 *
166 * Return: 1 on valid, 0 on invalid
167 */
pcie_advk_addr_valid(pci_dev_t bdf,int first_busno)168 static int pcie_advk_addr_valid(pci_dev_t bdf, int first_busno)
169 {
170 /*
171 * In PCIE-E only a single device (0) can exist
172 * on the local bus. Beyound the local bus, there might be
173 * a Switch and everything is possible.
174 */
175 if ((PCI_BUS(bdf) == first_busno) && (PCI_DEV(bdf) > 0))
176 return 0;
177
178 return 1;
179 }
180
181 /**
182 * pcie_advk_wait_pio() - Wait for PIO access to be accomplished
183 *
184 * @pcie: The PCI device to access
185 *
186 * Wait up to 1 micro second for PIO access to be accomplished.
187 *
188 * Return 1 (true) if PIO access is accomplished.
189 * Return 0 (false) if PIO access is timed out.
190 */
pcie_advk_wait_pio(struct pcie_advk * pcie)191 static int pcie_advk_wait_pio(struct pcie_advk *pcie)
192 {
193 uint start, isr;
194 uint count;
195
196 for (count = 0; count < MAX_RETRIES; count++) {
197 start = advk_readl(pcie, PIO_START);
198 isr = advk_readl(pcie, PIO_ISR);
199 if (!start && isr)
200 return 1;
201 /*
202 * Do not check the PIO state too frequently,
203 * 100us delay is appropriate.
204 */
205 udelay(PIO_WAIT_TIMEOUT);
206 }
207
208 dev_err(pcie->dev, "config read/write timed out\n");
209 return 0;
210 }
211
212 /**
213 * pcie_advk_check_pio_status() - Validate PIO status and get the read result
214 *
215 * @pcie: Pointer to the PCI bus
216 * @read: Read from or write to configuration space - true(read) false(write)
217 * @read_val: Pointer to the read result, only valid when read is true
218 *
219 */
pcie_advk_check_pio_status(struct pcie_advk * pcie,bool read,uint * read_val)220 static int pcie_advk_check_pio_status(struct pcie_advk *pcie,
221 bool read,
222 uint *read_val)
223 {
224 uint reg;
225 unsigned int status;
226 char *strcomp_status, *str_posted;
227
228 reg = advk_readl(pcie, PIO_STAT);
229 status = (reg & PIO_COMPLETION_STATUS_MASK) >>
230 PIO_COMPLETION_STATUS_SHIFT;
231
232 switch (status) {
233 case PIO_COMPLETION_STATUS_OK:
234 if (reg & PIO_ERR_STATUS) {
235 strcomp_status = "COMP_ERR";
236 break;
237 }
238 /* Get the read result */
239 if (read)
240 *read_val = advk_readl(pcie, PIO_RD_DATA);
241 /* No error */
242 strcomp_status = NULL;
243 break;
244 case PIO_COMPLETION_STATUS_UR:
245 if (read) {
246 /* For reading, UR is not an error status. */
247 *read_val = CFG_RD_UR_VAL;
248 strcomp_status = NULL;
249 } else {
250 strcomp_status = "UR";
251 }
252 break;
253 case PIO_COMPLETION_STATUS_CRS:
254 if (read) {
255 /* For reading, CRS is not an error status. */
256 *read_val = CFG_RD_CRS_VAL;
257 strcomp_status = NULL;
258 } else {
259 strcomp_status = "CRS";
260 }
261 break;
262 case PIO_COMPLETION_STATUS_CA:
263 strcomp_status = "CA";
264 break;
265 default:
266 strcomp_status = "Unknown";
267 break;
268 }
269
270 if (!strcomp_status)
271 return 0;
272
273 if (reg & PIO_NON_POSTED_REQ)
274 str_posted = "Non-posted";
275 else
276 str_posted = "Posted";
277
278 dev_err(pcie->dev, "%s PIO Response Status: %s, %#x @ %#x\n",
279 str_posted, strcomp_status, reg,
280 advk_readl(pcie, PIO_ADDR_LS));
281
282 return -EFAULT;
283 }
284
285 /**
286 * pcie_advk_read_config() - Read from configuration space
287 *
288 * @bus: Pointer to the PCI bus
289 * @bdf: Identifies the PCIe device to access
290 * @offset: The offset into the device's configuration space
291 * @valuep: A pointer at which to store the read value
292 * @size: Indicates the size of access to perform
293 *
294 * Read a value of size @size from offset @offset within the configuration
295 * space of the device identified by the bus, device & function numbers in @bdf
296 * on the PCI bus @bus.
297 *
298 * Return: 0 on success
299 */
pcie_advk_read_config(struct udevice * bus,pci_dev_t bdf,uint offset,ulong * valuep,enum pci_size_t size)300 static int pcie_advk_read_config(struct udevice *bus, pci_dev_t bdf,
301 uint offset, ulong *valuep,
302 enum pci_size_t size)
303 {
304 struct pcie_advk *pcie = dev_get_priv(bus);
305 uint reg;
306 int ret;
307
308 dev_dbg(pcie->dev, "PCIE CFG read: (b,d,f)=(%2d,%2d,%2d) ",
309 PCI_BUS(bdf), PCI_DEV(bdf), PCI_FUNC(bdf));
310
311 if (!pcie_advk_addr_valid(bdf, pcie->first_busno)) {
312 dev_dbg(pcie->dev, "- out of range\n");
313 *valuep = pci_get_ff(size);
314 return 0;
315 }
316
317 /* Start PIO */
318 advk_writel(pcie, 0, PIO_START);
319 advk_writel(pcie, 1, PIO_ISR);
320
321 /* Program the control register */
322 reg = advk_readl(pcie, PIO_CTRL);
323 reg &= ~PIO_CTRL_TYPE_MASK;
324 if (PCI_BUS(bdf) == pcie->first_busno)
325 reg |= PCIE_CONFIG_RD_TYPE0;
326 else
327 reg |= PCIE_CONFIG_RD_TYPE1;
328 advk_writel(pcie, reg, PIO_CTRL);
329
330 /* Program the address registers */
331 reg = PCIE_BDF(bdf) | PCIE_CONF_REG(offset);
332 advk_writel(pcie, reg, PIO_ADDR_LS);
333 advk_writel(pcie, 0, PIO_ADDR_MS);
334
335 /* Start the transfer */
336 advk_writel(pcie, 1, PIO_START);
337
338 if (!pcie_advk_wait_pio(pcie))
339 return -EINVAL;
340
341 /* Check PIO status and get the read result */
342 ret = pcie_advk_check_pio_status(pcie, true, ®);
343 if (ret)
344 return ret;
345
346 dev_dbg(pcie->dev, "(addr,size,val)=(0x%04x, %d, 0x%08x)\n",
347 offset, size, reg);
348 *valuep = pci_conv_32_to_size(reg, offset, size);
349
350 return 0;
351 }
352
353 /**
354 * pcie_calc_datastrobe() - Calculate data strobe
355 *
356 * @offset: The offset into the device's configuration space
357 * @size: Indicates the size of access to perform
358 *
359 * Calculate data strobe according to offset and size
360 *
361 */
pcie_calc_datastrobe(uint offset,enum pci_size_t size)362 static uint pcie_calc_datastrobe(uint offset, enum pci_size_t size)
363 {
364 uint bytes, data_strobe;
365
366 switch (size) {
367 case PCI_SIZE_8:
368 bytes = 1;
369 break;
370 case PCI_SIZE_16:
371 bytes = 2;
372 break;
373 default:
374 bytes = 4;
375 }
376
377 data_strobe = GENMASK(bytes - 1, 0) << (offset & 0x3);
378
379 return data_strobe;
380 }
381
382 /**
383 * pcie_advk_write_config() - Write to configuration space
384 *
385 * @bus: Pointer to the PCI bus
386 * @bdf: Identifies the PCIe device to access
387 * @offset: The offset into the device's configuration space
388 * @value: The value to write
389 * @size: Indicates the size of access to perform
390 *
391 * Write the value @value of size @size from offset @offset within the
392 * configuration space of the device identified by the bus, device & function
393 * numbers in @bdf on the PCI bus @bus.
394 *
395 * Return: 0 on success
396 */
pcie_advk_write_config(struct udevice * bus,pci_dev_t bdf,uint offset,ulong value,enum pci_size_t size)397 static int pcie_advk_write_config(struct udevice *bus, pci_dev_t bdf,
398 uint offset, ulong value,
399 enum pci_size_t size)
400 {
401 struct pcie_advk *pcie = dev_get_priv(bus);
402 uint reg;
403
404 dev_dbg(pcie->dev, "PCIE CFG write: (b,d,f)=(%2d,%2d,%2d) ",
405 PCI_BUS(bdf), PCI_DEV(bdf), PCI_FUNC(bdf));
406 dev_dbg(pcie->dev, "(addr,size,val)=(0x%04x, %d, 0x%08lx)\n",
407 offset, size, value);
408
409 if (!pcie_advk_addr_valid(bdf, pcie->first_busno)) {
410 dev_dbg(pcie->dev, "- out of range\n");
411 return 0;
412 }
413
414 /* Start PIO */
415 advk_writel(pcie, 0, PIO_START);
416 advk_writel(pcie, 1, PIO_ISR);
417
418 /* Program the control register */
419 reg = advk_readl(pcie, PIO_CTRL);
420 reg &= ~PIO_CTRL_TYPE_MASK;
421 if (PCI_BUS(bdf) == pcie->first_busno)
422 reg |= PCIE_CONFIG_WR_TYPE0;
423 else
424 reg |= PCIE_CONFIG_WR_TYPE1;
425 advk_writel(pcie, reg, PIO_CTRL);
426
427 /* Program the address registers */
428 reg = PCIE_BDF(bdf) | PCIE_CONF_REG(offset);
429 advk_writel(pcie, reg, PIO_ADDR_LS);
430 advk_writel(pcie, 0, PIO_ADDR_MS);
431 dev_dbg(pcie->dev, "\tPIO req. - addr = 0x%08x\n", reg);
432
433 /* Program the data register */
434 reg = pci_conv_size_to_32(0, value, offset, size);
435 advk_writel(pcie, reg, PIO_WR_DATA);
436 dev_dbg(pcie->dev, "\tPIO req. - val = 0x%08x\n", reg);
437
438 /* Program the data strobe */
439 reg = pcie_calc_datastrobe(offset, size);
440 advk_writel(pcie, reg, PIO_WR_DATA_STRB);
441 dev_dbg(pcie->dev, "\tPIO req. - strb = 0x%02x\n", reg);
442
443 /* Start the transfer */
444 advk_writel(pcie, 1, PIO_START);
445
446 if (!pcie_advk_wait_pio(pcie)) {
447 dev_dbg(pcie->dev, "- wait pio timeout\n");
448 return -EINVAL;
449 }
450
451 /* Check PIO status */
452 pcie_advk_check_pio_status(pcie, false, ®);
453
454 return 0;
455 }
456
457 /**
458 * pcie_advk_link_up() - Check if PCIe link is up or not
459 *
460 * @pcie: The PCI device to access
461 *
462 * Return 1 (true) on link up.
463 * Return 0 (false) on link down.
464 */
pcie_advk_link_up(struct pcie_advk * pcie)465 static int pcie_advk_link_up(struct pcie_advk *pcie)
466 {
467 u32 val, ltssm_state;
468
469 val = advk_readl(pcie, CFG_REG);
470 ltssm_state = (val >> LTSSM_SHIFT) & LTSSM_MASK;
471 return ltssm_state >= LTSSM_L0;
472 }
473
474 /**
475 * pcie_advk_wait_for_link() - Wait for link training to be accomplished
476 *
477 * @pcie: The PCI device to access
478 *
479 * Wait up to 1 second for link training to be accomplished.
480 *
481 * Return 1 (true) if link training ends up with link up success.
482 * Return 0 (false) if link training ends up with link up failure.
483 */
pcie_advk_wait_for_link(struct pcie_advk * pcie)484 static int pcie_advk_wait_for_link(struct pcie_advk *pcie)
485 {
486 int retries;
487
488 /* check if the link is up or not */
489 for (retries = 0; retries < MAX_RETRIES; retries++) {
490 if (pcie_advk_link_up(pcie)) {
491 printf("PCIE-%d: Link up\n", pcie->first_busno);
492 return 0;
493 }
494
495 udelay(LINK_WAIT_TIMEOUT);
496 }
497
498 printf("PCIE-%d: Link down\n", pcie->first_busno);
499
500 return -ETIMEDOUT;
501 }
502
503 /**
504 * pcie_advk_setup_hw() - PCIe initailzation
505 *
506 * @pcie: The PCI device to access
507 *
508 * Return: 0 on success
509 */
pcie_advk_setup_hw(struct pcie_advk * pcie)510 static int pcie_advk_setup_hw(struct pcie_advk *pcie)
511 {
512 u32 reg;
513
514 /* Set to Direct mode */
515 reg = advk_readl(pcie, CTRL_CONFIG_REG);
516 reg &= ~(CTRL_MODE_MASK << CTRL_MODE_SHIFT);
517 reg |= ((PCIE_CORE_MODE_DIRECT & CTRL_MODE_MASK) << CTRL_MODE_SHIFT);
518 advk_writel(pcie, reg, CTRL_CONFIG_REG);
519
520 /* Set PCI global control register to RC mode */
521 reg = advk_readl(pcie, PCIE_CORE_CTRL0_REG);
522 reg |= (IS_RC_MSK << IS_RC_SHIFT);
523 advk_writel(pcie, reg, PCIE_CORE_CTRL0_REG);
524
525 /* Set Advanced Error Capabilities and Control PF0 register */
526 reg = PCIE_CORE_ERR_CAPCTL_ECRC_CHK_TX |
527 PCIE_CORE_ERR_CAPCTL_ECRC_CHK_TX_EN |
528 PCIE_CORE_ERR_CAPCTL_ECRC_CHECK |
529 PCIE_CORE_ERR_CAPCTL_ECRC_CHECK_RCV;
530 advk_writel(pcie, reg, PCIE_CORE_ERR_CAPCTL_REG);
531
532 /* Set PCIe Device Control and Status 1 PF0 register */
533 reg = PCIE_CORE_DEV_CTRL_STATS_RELAX_ORDER_DISABLE |
534 PCIE_CORE_DEV_CTRL_STATS_SNOOP_DISABLE;
535 advk_writel(pcie, reg, PCIE_CORE_DEV_CTRL_STATS_REG);
536
537 /* Program PCIe Control 2 to disable strict ordering */
538 reg = PCIE_CORE_CTRL2_RESERVED |
539 PCIE_CORE_CTRL2_TD_ENABLE;
540 advk_writel(pcie, reg, PCIE_CORE_CTRL2_REG);
541
542 /* Set GEN2 */
543 reg = advk_readl(pcie, PCIE_CORE_CTRL0_REG);
544 reg &= ~PCIE_GEN_SEL_MSK;
545 reg |= SPEED_GEN_2;
546 advk_writel(pcie, reg, PCIE_CORE_CTRL0_REG);
547
548 /* Set lane X1 */
549 reg = advk_readl(pcie, PCIE_CORE_CTRL0_REG);
550 reg &= ~LANE_CNT_MSK;
551 reg |= LANE_COUNT_1;
552 advk_writel(pcie, reg, PCIE_CORE_CTRL0_REG);
553
554 /* Enable link training */
555 reg = advk_readl(pcie, PCIE_CORE_CTRL0_REG);
556 reg |= LINK_TRAINING_EN;
557 advk_writel(pcie, reg, PCIE_CORE_CTRL0_REG);
558
559 /*
560 * Enable AXI address window location generation:
561 * When it is enabled, the default outbound window
562 * configurations (Default User Field: 0xD0074CFC)
563 * are used to transparent address translation for
564 * the outbound transactions. Thus, PCIe address
565 * windows are not required.
566 */
567 reg = advk_readl(pcie, PCIE_CORE_CTRL2_REG);
568 reg |= PCIE_CORE_CTRL2_ADDRWIN_MAP_ENABLE;
569 advk_writel(pcie, reg, PCIE_CORE_CTRL2_REG);
570
571 /*
572 * Bypass the address window mapping for PIO:
573 * Since PIO access already contains all required
574 * info over AXI interface by PIO registers, the
575 * address window is not required.
576 */
577 reg = advk_readl(pcie, PIO_CTRL);
578 reg |= PIO_CTRL_ADDR_WIN_DISABLE;
579 advk_writel(pcie, reg, PIO_CTRL);
580
581 /* Start link training */
582 reg = advk_readl(pcie, PCIE_CORE_LINK_CTRL_STAT_REG);
583 reg |= PCIE_CORE_LINK_TRAINING;
584 advk_writel(pcie, reg, PCIE_CORE_LINK_CTRL_STAT_REG);
585
586 /* Wait for PCIe link up */
587 if (pcie_advk_wait_for_link(pcie))
588 return -ENXIO;
589
590 reg = advk_readl(pcie, PCIE_CORE_CMD_STATUS_REG);
591 reg |= PCIE_CORE_CMD_MEM_ACCESS_EN |
592 PCIE_CORE_CMD_IO_ACCESS_EN |
593 PCIE_CORE_CMD_MEM_IO_REQ_EN;
594 advk_writel(pcie, reg, PCIE_CORE_CMD_STATUS_REG);
595
596 return 0;
597 }
598
599 /**
600 * pcie_advk_probe() - Probe the PCIe bus for active link
601 *
602 * @dev: A pointer to the device being operated on
603 *
604 * Probe for an active link on the PCIe bus and configure the controller
605 * to enable this port.
606 *
607 * Return: 0 on success, else -ENODEV
608 */
pcie_advk_probe(struct udevice * dev)609 static int pcie_advk_probe(struct udevice *dev)
610 {
611 struct pcie_advk *pcie = dev_get_priv(dev);
612
613 #ifdef CONFIG_DM_GPIO
614 struct gpio_desc reset_gpio;
615
616 gpio_request_by_name(dev, "reset-gpio", 0, &reset_gpio,
617 GPIOD_IS_OUT);
618 /*
619 * Issue reset to add-in card through the dedicated GPIO.
620 * Some boards are connecting the card reset pin to common system
621 * reset wire and others are using separate GPIO port.
622 * In the last case we have to release a reset of the addon card
623 * using this GPIO.
624 *
625 * FIX-ME:
626 * The PCIe RESET signal is not supposed to be released along
627 * with the SOC RESET signal. It should be lowered as early as
628 * possible before PCIe PHY initialization. Moreover, the PCIe
629 * clock should be gated as well.
630 */
631 if (dm_gpio_is_valid(&reset_gpio)) {
632 dev_dbg(pcie->dev, "Toggle PCIE Reset GPIO ...\n");
633 dm_gpio_set_value(&reset_gpio, 0);
634 mdelay(200);
635 dm_gpio_set_value(&reset_gpio, 1);
636 }
637 #else
638 dev_dbg(pcie->dev, "PCIE Reset on GPIO support is missing\n");
639 #endif /* CONFIG_DM_GPIO */
640
641 pcie->first_busno = dev->seq;
642 pcie->dev = pci_get_controller(dev);
643
644 return pcie_advk_setup_hw(pcie);
645 }
646
647 /**
648 * pcie_advk_ofdata_to_platdata() - Translate from DT to device state
649 *
650 * @dev: A pointer to the device being operated on
651 *
652 * Translate relevant data from the device tree pertaining to device @dev into
653 * state that the driver will later make use of. This state is stored in the
654 * device's private data structure.
655 *
656 * Return: 0 on success, else -EINVAL
657 */
pcie_advk_ofdata_to_platdata(struct udevice * dev)658 static int pcie_advk_ofdata_to_platdata(struct udevice *dev)
659 {
660 struct pcie_advk *pcie = dev_get_priv(dev);
661
662 /* Get the register base address */
663 pcie->base = (void *)dev_read_addr_index(dev, 0);
664 if ((fdt_addr_t)pcie->base == FDT_ADDR_T_NONE)
665 return -EINVAL;
666
667 return 0;
668 }
669
670 static const struct dm_pci_ops pcie_advk_ops = {
671 .read_config = pcie_advk_read_config,
672 .write_config = pcie_advk_write_config,
673 };
674
675 static const struct udevice_id pcie_advk_ids[] = {
676 { .compatible = "marvell,armada-37xx-pcie" },
677 { }
678 };
679
680 U_BOOT_DRIVER(pcie_advk) = {
681 .name = "pcie_advk",
682 .id = UCLASS_PCI,
683 .of_match = pcie_advk_ids,
684 .ops = &pcie_advk_ops,
685 .ofdata_to_platdata = pcie_advk_ofdata_to_platdata,
686 .probe = pcie_advk_probe,
687 .priv_auto_alloc_size = sizeof(struct pcie_advk),
688 };
689