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.
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.
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 * ***************************************************************************
20 * Ported from Linux driver - driver/pci/host/pci-aardvark.c
22 * Author: Victor Gu <xigu@marvell.com>
23 * Hezi Shahmoon <hezi.shahmoon@marvell.com>
24 * Pali Rohár <pali@kernel.org>
32 #include <asm-generic/gpio.h>
33 #include <dm/device_compat.h>
34 #include <linux/bitops.h>
35 #include <linux/delay.h>
36 #include <linux/ioport.h>
38 /* PCIe core registers */
39 #define PCIE_CORE_CMD_STATUS_REG 0x4
40 #define PCIE_CORE_CMD_IO_ACCESS_EN BIT(0)
41 #define PCIE_CORE_CMD_MEM_ACCESS_EN BIT(1)
42 #define PCIE_CORE_CMD_MEM_IO_REQ_EN BIT(2)
43 #define PCIE_CORE_DEV_REV_REG 0x8
44 #define PCIE_CORE_EXP_ROM_BAR_REG 0x30
45 #define PCIE_CORE_PCIEXP_CAP_OFF 0xc0
46 #define PCIE_CORE_DEV_CTRL_STATS_REG 0xc8
47 #define PCIE_CORE_DEV_CTRL_STATS_RELAX_ORDER_DISABLE (0 << 4)
48 #define PCIE_CORE_DEV_CTRL_STATS_SNOOP_DISABLE (0 << 11)
49 #define PCIE_CORE_DEV_CTRL_STATS_MAX_PAYLOAD_SIZE 0x2
50 #define PCIE_CORE_DEV_CTRL_STATS_MAX_PAYLOAD_SIZE_SHIFT 5
51 #define PCIE_CORE_DEV_CTRL_STATS_MAX_RD_REQ_SIZE 0x2
52 #define PCIE_CORE_DEV_CTRL_STATS_MAX_RD_REQ_SIZE_SHIFT 12
53 #define PCIE_CORE_LINK_CTRL_STAT_REG 0xd0
54 #define PCIE_CORE_LINK_TRAINING BIT(5)
55 #define PCIE_CORE_ERR_CAPCTL_REG 0x118
56 #define PCIE_CORE_ERR_CAPCTL_ECRC_CHK_TX BIT(5)
57 #define PCIE_CORE_ERR_CAPCTL_ECRC_CHK_TX_EN BIT(6)
58 #define PCIE_CORE_ERR_CAPCTL_ECRC_CHECK BIT(7)
59 #define PCIE_CORE_ERR_CAPCTL_ECRC_CHECK_RCV BIT(8)
61 /* PIO registers base address and register offsets */
62 #define PIO_BASE_ADDR 0x4000
63 #define PIO_CTRL (PIO_BASE_ADDR + 0x0)
64 #define PIO_CTRL_TYPE_MASK GENMASK(3, 0)
65 #define PIO_CTRL_ADDR_WIN_DISABLE BIT(24)
66 #define PIO_STAT (PIO_BASE_ADDR + 0x4)
67 #define PIO_COMPLETION_STATUS_SHIFT 7
68 #define PIO_COMPLETION_STATUS_MASK GENMASK(9, 7)
69 #define PIO_COMPLETION_STATUS_OK 0
70 #define PIO_COMPLETION_STATUS_UR 1
71 #define PIO_COMPLETION_STATUS_CRS 2
72 #define PIO_COMPLETION_STATUS_CA 4
73 #define PIO_NON_POSTED_REQ BIT(10)
74 #define PIO_ERR_STATUS BIT(11)
75 #define PIO_ADDR_LS (PIO_BASE_ADDR + 0x8)
76 #define PIO_ADDR_MS (PIO_BASE_ADDR + 0xc)
77 #define PIO_WR_DATA (PIO_BASE_ADDR + 0x10)
78 #define PIO_WR_DATA_STRB (PIO_BASE_ADDR + 0x14)
79 #define PIO_RD_DATA (PIO_BASE_ADDR + 0x18)
80 #define PIO_START (PIO_BASE_ADDR + 0x1c)
81 #define PIO_ISR (PIO_BASE_ADDR + 0x20)
83 /* Aardvark Control registers */
84 #define CONTROL_BASE_ADDR 0x4800
85 #define PCIE_CORE_CTRL0_REG (CONTROL_BASE_ADDR + 0x0)
86 #define PCIE_GEN_SEL_MSK 0x3
87 #define PCIE_GEN_SEL_SHIFT 0x0
93 #define LANE_CNT_MSK 0x18
94 #define LANE_CNT_SHIFT 0x3
95 #define LANE_COUNT_1 (0 << LANE_CNT_SHIFT)
96 #define LANE_COUNT_2 (1 << LANE_CNT_SHIFT)
97 #define LANE_COUNT_4 (2 << LANE_CNT_SHIFT)
98 #define LANE_COUNT_8 (3 << LANE_CNT_SHIFT)
99 #define LINK_TRAINING_EN BIT(6)
100 #define PCIE_CORE_CTRL2_REG (CONTROL_BASE_ADDR + 0x8)
101 #define PCIE_CORE_CTRL2_RESERVED 0x7
102 #define PCIE_CORE_CTRL2_TD_ENABLE BIT(4)
103 #define PCIE_CORE_CTRL2_STRICT_ORDER_ENABLE BIT(5)
104 #define PCIE_CORE_CTRL2_ADDRWIN_MAP_ENABLE BIT(6)
106 /* PCIe window configuration */
107 #define OB_WIN_BASE_ADDR 0x4c00
108 #define OB_WIN_BLOCK_SIZE 0x20
109 #define OB_WIN_COUNT 8
110 #define OB_WIN_REG_ADDR(win, offset) (OB_WIN_BASE_ADDR + \
111 OB_WIN_BLOCK_SIZE * (win) + \
113 #define OB_WIN_MATCH_LS(win) OB_WIN_REG_ADDR(win, 0x00)
114 #define OB_WIN_ENABLE BIT(0)
115 #define OB_WIN_MATCH_MS(win) OB_WIN_REG_ADDR(win, 0x04)
116 #define OB_WIN_REMAP_LS(win) OB_WIN_REG_ADDR(win, 0x08)
117 #define OB_WIN_REMAP_MS(win) OB_WIN_REG_ADDR(win, 0x0c)
118 #define OB_WIN_MASK_LS(win) OB_WIN_REG_ADDR(win, 0x10)
119 #define OB_WIN_MASK_MS(win) OB_WIN_REG_ADDR(win, 0x14)
120 #define OB_WIN_ACTIONS(win) OB_WIN_REG_ADDR(win, 0x18)
121 #define OB_WIN_DEFAULT_ACTIONS (OB_WIN_ACTIONS(OB_WIN_COUNT-1) + 0x4)
122 #define OB_WIN_FUNC_NUM_MASK GENMASK(31, 24)
123 #define OB_WIN_FUNC_NUM_SHIFT 24
124 #define OB_WIN_FUNC_NUM_ENABLE BIT(23)
125 #define OB_WIN_BUS_NUM_BITS_MASK GENMASK(22, 20)
126 #define OB_WIN_BUS_NUM_BITS_SHIFT 20
127 #define OB_WIN_MSG_CODE_ENABLE BIT(22)
128 #define OB_WIN_MSG_CODE_MASK GENMASK(21, 14)
129 #define OB_WIN_MSG_CODE_SHIFT 14
130 #define OB_WIN_MSG_PAYLOAD_LEN BIT(12)
131 #define OB_WIN_ATTR_ENABLE BIT(11)
132 #define OB_WIN_ATTR_TC_MASK GENMASK(10, 8)
133 #define OB_WIN_ATTR_TC_SHIFT 8
134 #define OB_WIN_ATTR_RELAXED BIT(7)
135 #define OB_WIN_ATTR_NOSNOOP BIT(6)
136 #define OB_WIN_ATTR_POISON BIT(5)
137 #define OB_WIN_ATTR_IDO BIT(4)
138 #define OB_WIN_TYPE_MASK GENMASK(3, 0)
139 #define OB_WIN_TYPE_SHIFT 0
140 #define OB_WIN_TYPE_MEM 0x0
141 #define OB_WIN_TYPE_IO 0x4
142 #define OB_WIN_TYPE_CONFIG_TYPE0 0x8
143 #define OB_WIN_TYPE_CONFIG_TYPE1 0x9
144 #define OB_WIN_TYPE_MSG 0xc
146 /* LMI registers base address and register offsets */
147 #define LMI_BASE_ADDR 0x6000
148 #define CFG_REG (LMI_BASE_ADDR + 0x0)
149 #define LTSSM_SHIFT 24
150 #define LTSSM_MASK 0x3f
151 #define LTSSM_L0 0x10
152 #define LTSSM_DISABLED 0x20
153 #define VENDOR_ID_REG (LMI_BASE_ADDR + 0x44)
155 /* PCIe core controller registers */
156 #define CTRL_CORE_BASE_ADDR 0x18000
157 #define CTRL_CONFIG_REG (CTRL_CORE_BASE_ADDR + 0x0)
158 #define CTRL_MODE_SHIFT 0x0
159 #define CTRL_MODE_MASK 0x1
160 #define PCIE_CORE_MODE_DIRECT 0x0
161 #define PCIE_CORE_MODE_COMMAND 0x1
163 /* Transaction types */
164 #define PCIE_CONFIG_RD_TYPE0 0x8
165 #define PCIE_CONFIG_RD_TYPE1 0x9
166 #define PCIE_CONFIG_WR_TYPE0 0xa
167 #define PCIE_CONFIG_WR_TYPE1 0xb
169 /* PCIe Retries & Timeout definitions */
170 #define PIO_MAX_RETRIES 1500
171 #define PIO_WAIT_TIMEOUT 1000
172 #define LINK_MAX_RETRIES 10
173 #define LINK_WAIT_TIMEOUT 100000
175 #define CFG_RD_CRS_VAL 0xFFFF0001
178 * struct pcie_advk - Advk PCIe controller state
180 * @base: The base address of the register space.
181 * @first_busno: Bus number of the PCIe root-port.
182 * This may vary depending on the PCIe setup.
183 * @sec_busno: Bus number for the device behind the PCIe root-port.
184 * @dev: The pointer to PCI uclass device.
185 * @reset_gpio: GPIO descriptor for PERST.
186 * @cfgcache: Buffer for emulation of PCIe Root Port's PCI Bridge registers
187 * that are not available on Aardvark.
188 * @cfgcrssve: For CRSSVE emulation.
195 struct gpio_desc reset_gpio;
196 u32 cfgcache[(0x3c - 0x10) / 4];
200 static inline void advk_writel(struct pcie_advk *pcie, uint val, uint reg)
202 writel(val, pcie->base + reg);
205 static inline uint advk_readl(struct pcie_advk *pcie, uint reg)
207 return readl(pcie->base + reg);
211 * pcie_advk_addr_valid() - Check for valid bus address
213 * @pcie: Pointer to the PCI bus
214 * @busno: Bus number of PCI device
215 * @dev: Device number of PCI device
216 * @func: Function number of PCI device
217 * @bdf: The PCI device to access
219 * Return: true on valid, false on invalid
221 static bool pcie_advk_addr_valid(struct pcie_advk *pcie,
222 int busno, u8 dev, u8 func)
224 /* On the primary (local) bus there is only one PCI Bridge */
225 if (busno == pcie->first_busno && (dev != 0 || func != 0))
229 * In PCI-E only a single device (0) can exist on the secondary bus.
230 * Beyond the secondary bus, there might be a Switch and anything is
233 if (busno == pcie->sec_busno && dev != 0)
240 * pcie_advk_wait_pio() - Wait for PIO access to be accomplished
242 * @pcie: The PCI device to access
244 * Wait up to 1.5 seconds for PIO access to be accomplished.
246 * Return positive - retry count if PIO access is accomplished.
247 * Return negative - error if PIO access is timed out.
249 static int pcie_advk_wait_pio(struct pcie_advk *pcie)
254 for (count = 1; count <= PIO_MAX_RETRIES; count++) {
255 start = advk_readl(pcie, PIO_START);
256 isr = advk_readl(pcie, PIO_ISR);
260 * Do not check the PIO state too frequently,
261 * 100us delay is appropriate.
263 udelay(PIO_WAIT_TIMEOUT);
266 dev_err(pcie->dev, "PIO read/write transfer time out\n");
271 * pcie_advk_check_pio_status() - Validate PIO status and get the read result
273 * @pcie: Pointer to the PCI bus
274 * @allow_crs: Only for read requests, if CRS response is allowed
275 * @read_val: Pointer to the read result
277 * Return: 0 on success
279 static int pcie_advk_check_pio_status(struct pcie_advk *pcie,
286 char *strcomp_status, *str_posted;
288 reg = advk_readl(pcie, PIO_STAT);
289 status = (reg & PIO_COMPLETION_STATUS_MASK) >>
290 PIO_COMPLETION_STATUS_SHIFT;
293 case PIO_COMPLETION_STATUS_OK:
294 if (reg & PIO_ERR_STATUS) {
295 strcomp_status = "COMP_ERR";
299 /* Get the read result */
301 *read_val = advk_readl(pcie, PIO_RD_DATA);
303 strcomp_status = NULL;
306 case PIO_COMPLETION_STATUS_UR:
307 strcomp_status = "UR";
310 case PIO_COMPLETION_STATUS_CRS:
311 if (allow_crs && read_val) {
312 /* For reading, CRS is not an error status. */
313 *read_val = CFG_RD_CRS_VAL;
314 strcomp_status = NULL;
317 strcomp_status = "CRS";
321 case PIO_COMPLETION_STATUS_CA:
322 strcomp_status = "CA";
326 strcomp_status = "Unknown";
334 if (reg & PIO_NON_POSTED_REQ)
335 str_posted = "Non-posted";
337 str_posted = "Posted";
339 dev_dbg(pcie->dev, "%s PIO Response Status: %s, %#x @ %#x\n",
340 str_posted, strcomp_status, reg,
341 advk_readl(pcie, PIO_ADDR_LS));
347 * pcie_advk_read_config() - Read from configuration space
349 * @bus: Pointer to the PCI bus
350 * @bdf: Identifies the PCIe device to access
351 * @offset: The offset into the device's configuration space
352 * @valuep: A pointer at which to store the read value
353 * @size: Indicates the size of access to perform
355 * Read a value of size @size from offset @offset within the configuration
356 * space of the device identified by the bus, device & function numbers in @bdf
357 * on the PCI bus @bus.
359 * Return: 0 on success
361 static int pcie_advk_read_config(const struct udevice *bus, pci_dev_t bdf,
362 uint offset, ulong *valuep,
363 enum pci_size_t size)
365 struct pcie_advk *pcie = dev_get_priv(bus);
366 int busno = PCI_BUS(bdf) - dev_seq(bus);
373 dev_dbg(pcie->dev, "PCIE CFG read: (b,d,f)=(%2d,%2d,%2d) ",
374 PCI_BUS(bdf), PCI_DEV(bdf), PCI_FUNC(bdf));
376 if (!pcie_advk_addr_valid(pcie, busno, PCI_DEV(bdf), PCI_FUNC(bdf))) {
377 dev_dbg(pcie->dev, "- out of range\n");
378 *valuep = pci_get_ff(size);
383 * The configuration space of the PCI Bridge on primary (first) bus is
384 * not accessible via PIO transfers like all other PCIe devices. PCI
385 * Bridge config registers are available directly in Aardvark memory
386 * space starting at offset zero. The PCI Bridge config space is of
387 * Type 0, but the BAR registers (including ROM BAR) don't have the same
388 * meaning as in the PCIe specification. Therefore do not access BAR
389 * registers and non-common registers (those which have different
390 * meaning for Type 0 and Type 1 config space) of the primary PCI Bridge
391 * and instead read their content from driver virtual cfgcache[].
393 if (busno == pcie->first_busno) {
394 if ((offset >= 0x10 && offset < 0x34) || (offset >= 0x38 && offset < 0x3c))
395 data = pcie->cfgcache[(offset - 0x10) / 4];
397 data = advk_readl(pcie, offset & ~3);
399 if ((offset & ~3) == (PCI_HEADER_TYPE & ~3)) {
401 * Change Header Type of PCI Bridge device to Type 1
402 * (0x01, used by PCI Bridges) because hardwired value
403 * is Type 0 (0x00, used by Endpoint devices).
406 data |= PCI_HEADER_TYPE_BRIDGE << 16;
409 if ((offset & ~3) == PCIE_CORE_PCIEXP_CAP_OFF + PCI_EXP_RTCTL) {
410 /* CRSSVE bit is stored only in cache */
412 data |= PCI_EXP_RTCTL_CRSSVE;
415 if ((offset & ~3) == PCIE_CORE_PCIEXP_CAP_OFF +
416 (PCI_EXP_RTCAP & ~3)) {
417 /* CRS is emulated below, so set CRSVIS capability */
418 data |= PCI_EXP_RTCAP_CRSVIS << 16;
421 *valuep = pci_conv_32_to_size(data, offset, size);
427 * Returning fabricated CRS value (0xFFFF0001) by PCIe Root Complex to
428 * OS is allowed only for 4-byte PCI_VENDOR_ID config read request and
429 * only when CRSSVE bit in Root Port PCIe device is enabled. In all
430 * other error PCIe Root Complex must return all-ones.
432 * U-Boot currently does not support handling of CRS return value for
433 * PCI_VENDOR_ID config read request and also does not set CRSSVE bit.
434 * So it means that pcie->cfgcrssve is false. But the code is prepared
435 * for returning CRS, so that if U-Boot does support CRS in the future,
436 * it will work for Aardvark.
438 allow_crs = (offset == PCI_VENDOR_ID) && (size == PCI_SIZE_32) && pcie->cfgcrssve;
440 if (advk_readl(pcie, PIO_START)) {
442 "Previous PIO read/write transfer is still running\n");
444 *valuep = CFG_RD_CRS_VAL;
447 *valuep = pci_get_ff(size);
451 /* Program the control register */
452 reg = advk_readl(pcie, PIO_CTRL);
453 reg &= ~PIO_CTRL_TYPE_MASK;
454 if (busno == pcie->sec_busno)
455 reg |= PCIE_CONFIG_RD_TYPE0;
457 reg |= PCIE_CONFIG_RD_TYPE1;
458 advk_writel(pcie, reg, PIO_CTRL);
460 /* Program the address registers */
461 reg = PCIE_ECAM_OFFSET(busno, PCI_DEV(bdf), PCI_FUNC(bdf), (offset & ~0x3));
462 advk_writel(pcie, reg, PIO_ADDR_LS);
463 advk_writel(pcie, 0, PIO_ADDR_MS);
465 /* Program the data strobe */
466 advk_writel(pcie, 0xf, PIO_WR_DATA_STRB);
471 /* Start the transfer */
472 advk_writel(pcie, 1, PIO_ISR);
473 advk_writel(pcie, 1, PIO_START);
475 ret = pcie_advk_wait_pio(pcie);
478 *valuep = CFG_RD_CRS_VAL;
481 *valuep = pci_get_ff(size);
487 /* Check PIO status and get the read result */
488 ret = pcie_advk_check_pio_status(pcie, allow_crs, ®);
489 if (ret == -EAGAIN && retry_count < PIO_MAX_RETRIES)
492 *valuep = pci_get_ff(size);
496 dev_dbg(pcie->dev, "(addr,size,val)=(0x%04x, %d, 0x%08x)\n",
498 *valuep = pci_conv_32_to_size(reg, offset, size);
504 * pcie_calc_datastrobe() - Calculate data strobe
506 * @offset: The offset into the device's configuration space
507 * @size: Indicates the size of access to perform
509 * Calculate data strobe according to offset and size
512 static uint pcie_calc_datastrobe(uint offset, enum pci_size_t size)
514 uint bytes, data_strobe;
527 data_strobe = GENMASK(bytes - 1, 0) << (offset & 0x3);
533 * pcie_advk_write_config() - Write to configuration space
535 * @bus: Pointer to the PCI bus
536 * @bdf: Identifies the PCIe device to access
537 * @offset: The offset into the device's configuration space
538 * @value: The value to write
539 * @size: Indicates the size of access to perform
541 * Write the value @value of size @size from offset @offset within the
542 * configuration space of the device identified by the bus, device & function
543 * numbers in @bdf on the PCI bus @bus.
545 * Return: 0 on success
547 static int pcie_advk_write_config(struct udevice *bus, pci_dev_t bdf,
548 uint offset, ulong value,
549 enum pci_size_t size)
551 struct pcie_advk *pcie = dev_get_priv(bus);
552 int busno = PCI_BUS(bdf) - dev_seq(bus);
558 dev_dbg(pcie->dev, "PCIE CFG write: (b,d,f)=(%2d,%2d,%2d) ",
559 PCI_BUS(bdf), PCI_DEV(bdf), PCI_FUNC(bdf));
560 dev_dbg(pcie->dev, "(addr,size,val)=(0x%04x, %d, 0x%08lx)\n",
561 offset, size, value);
563 if (!pcie_advk_addr_valid(pcie, busno, PCI_DEV(bdf), PCI_FUNC(bdf))) {
564 dev_dbg(pcie->dev, "- out of range\n");
569 * As explained in pcie_advk_read_config(), PCI Bridge config registers
570 * are available directly in Aardvark memory space starting at offset
571 * zero. Type 1 specific registers are not available, so we write their
572 * content only into driver virtual cfgcache[].
574 if (busno == pcie->first_busno) {
575 if ((offset >= 0x10 && offset < 0x34) ||
576 (offset >= 0x38 && offset < 0x3c)) {
577 data = pcie->cfgcache[(offset - 0x10) / 4];
578 data = pci_conv_size_to_32(data, value, offset, size);
579 /* This PCI bridge does not have configurable bars */
580 if ((offset & ~3) == PCI_BASE_ADDRESS_0 ||
581 (offset & ~3) == PCI_BASE_ADDRESS_1 ||
582 (offset & ~3) == PCI_ROM_ADDRESS1)
584 pcie->cfgcache[(offset - 0x10) / 4] = data;
586 data = advk_readl(pcie, offset & ~3);
587 data = pci_conv_size_to_32(data, value, offset, size);
588 advk_writel(pcie, data, offset & ~3);
591 if (offset == PCI_PRIMARY_BUS)
592 pcie->first_busno = data & 0xff;
594 if (offset == PCI_SECONDARY_BUS ||
595 (offset == PCI_PRIMARY_BUS && size != PCI_SIZE_8))
596 pcie->sec_busno = (data >> 8) & 0xff;
598 if ((offset & ~3) == PCIE_CORE_PCIEXP_CAP_OFF + PCI_EXP_RTCTL)
599 pcie->cfgcrssve = data & PCI_EXP_RTCTL_CRSSVE;
604 if (advk_readl(pcie, PIO_START)) {
606 "Previous PIO read/write transfer is still running\n");
610 /* Program the control register */
611 reg = advk_readl(pcie, PIO_CTRL);
612 reg &= ~PIO_CTRL_TYPE_MASK;
613 if (busno == pcie->sec_busno)
614 reg |= PCIE_CONFIG_WR_TYPE0;
616 reg |= PCIE_CONFIG_WR_TYPE1;
617 advk_writel(pcie, reg, PIO_CTRL);
619 /* Program the address registers */
620 reg = PCIE_ECAM_OFFSET(busno, PCI_DEV(bdf), PCI_FUNC(bdf), (offset & ~0x3));
621 advk_writel(pcie, reg, PIO_ADDR_LS);
622 advk_writel(pcie, 0, PIO_ADDR_MS);
623 dev_dbg(pcie->dev, "\tPIO req. - addr = 0x%08x\n", reg);
625 /* Program the data register */
626 reg = pci_conv_size_to_32(0, value, offset, size);
627 advk_writel(pcie, reg, PIO_WR_DATA);
628 dev_dbg(pcie->dev, "\tPIO req. - val = 0x%08x\n", reg);
630 /* Program the data strobe */
631 reg = pcie_calc_datastrobe(offset, size);
632 advk_writel(pcie, reg, PIO_WR_DATA_STRB);
633 dev_dbg(pcie->dev, "\tPIO req. - strb = 0x%02x\n", reg);
638 /* Start the transfer */
639 advk_writel(pcie, 1, PIO_ISR);
640 advk_writel(pcie, 1, PIO_START);
642 ret = pcie_advk_wait_pio(pcie);
648 /* Check PIO status */
649 ret = pcie_advk_check_pio_status(pcie, false, NULL);
650 if (ret == -EAGAIN && retry_count < PIO_MAX_RETRIES)
656 * pcie_advk_link_up() - Check if PCIe link is up or not
658 * @pcie: The PCI device to access
660 * Return 1 (true) on link up.
661 * Return 0 (false) on link down.
663 static int pcie_advk_link_up(struct pcie_advk *pcie)
665 u32 val, ltssm_state;
667 val = advk_readl(pcie, CFG_REG);
668 ltssm_state = (val >> LTSSM_SHIFT) & LTSSM_MASK;
669 return ltssm_state >= LTSSM_L0 && ltssm_state < LTSSM_DISABLED;
673 * pcie_advk_wait_for_link() - Wait for link training to be accomplished
675 * @pcie: The PCI device to access
677 * Wait up to 1 second for link training to be accomplished.
679 * Return 1 (true) if link training ends up with link up success.
680 * Return 0 (false) if link training ends up with link up failure.
682 static int pcie_advk_wait_for_link(struct pcie_advk *pcie)
686 /* check if the link is up or not */
687 for (retries = 0; retries < LINK_MAX_RETRIES; retries++) {
688 if (pcie_advk_link_up(pcie)) {
689 printf("PCIe: Link up\n");
693 udelay(LINK_WAIT_TIMEOUT);
696 printf("PCIe: Link down\n");
702 * Set PCIe address window register which could be used for memory
705 static void pcie_advk_set_ob_win(struct pcie_advk *pcie, u8 win_num,
706 phys_addr_t match, phys_addr_t remap,
707 phys_addr_t mask, u32 actions)
709 advk_writel(pcie, OB_WIN_ENABLE |
710 lower_32_bits(match), OB_WIN_MATCH_LS(win_num));
711 advk_writel(pcie, upper_32_bits(match), OB_WIN_MATCH_MS(win_num));
712 advk_writel(pcie, lower_32_bits(remap), OB_WIN_REMAP_LS(win_num));
713 advk_writel(pcie, upper_32_bits(remap), OB_WIN_REMAP_MS(win_num));
714 advk_writel(pcie, lower_32_bits(mask), OB_WIN_MASK_LS(win_num));
715 advk_writel(pcie, upper_32_bits(mask), OB_WIN_MASK_MS(win_num));
716 advk_writel(pcie, actions, OB_WIN_ACTIONS(win_num));
719 static void pcie_advk_disable_ob_win(struct pcie_advk *pcie, u8 win_num)
721 advk_writel(pcie, 0, OB_WIN_MATCH_LS(win_num));
722 advk_writel(pcie, 0, OB_WIN_MATCH_MS(win_num));
723 advk_writel(pcie, 0, OB_WIN_REMAP_LS(win_num));
724 advk_writel(pcie, 0, OB_WIN_REMAP_MS(win_num));
725 advk_writel(pcie, 0, OB_WIN_MASK_LS(win_num));
726 advk_writel(pcie, 0, OB_WIN_MASK_MS(win_num));
727 advk_writel(pcie, 0, OB_WIN_ACTIONS(win_num));
730 static void pcie_advk_set_ob_region(struct pcie_advk *pcie, int *wins,
731 struct pci_region *region, u32 actions)
733 phys_addr_t phys_start = region->phys_start;
734 pci_addr_t bus_start = region->bus_start;
735 pci_size_t size = region->size;
736 phys_addr_t win_mask;
743 * The n-th PCIe window is configured by tuple (match, remap, mask)
744 * and an access to address A uses this window if A matches the
745 * match with given mask.
746 * So every PCIe window size must be a power of two and every start
747 * address must be aligned to window size. Minimal size is 64 KiB
748 * because lower 16 bits of mask must be zero. Remapped address
749 * may have set only bits from the mask.
751 while (*wins < OB_WIN_COUNT && size > 0) {
752 /* Calculate the largest aligned window size */
753 win_size = (1ULL << (fls64(size) - 1)) |
754 (phys_start ? (1ULL << __ffs64(phys_start)) : 0);
755 win_size = 1ULL << __ffs64(win_size);
756 win_mask = ~(win_size - 1);
757 if (win_size < 0x10000 || (bus_start & ~win_mask))
761 "Configuring PCIe window %d: [0x%llx-0x%llx] as 0x%x\n",
762 *wins, (u64)phys_start, (u64)phys_start + win_size,
764 pcie_advk_set_ob_win(pcie, *wins, phys_start, bus_start,
767 phys_start += win_size;
768 bus_start += win_size;
776 "Invalid PCIe region [0x%llx-0x%llx]\n",
777 (u64)region->phys_start,
778 (u64)region->phys_start + region->size);
783 * pcie_advk_setup_hw() - PCIe initailzation
785 * @pcie: The PCI device to access
787 * Return: 0 on success
789 static int pcie_advk_setup_hw(struct pcie_advk *pcie)
791 struct pci_region *io, *mem, *pref;
795 /* Set to Direct mode */
796 reg = advk_readl(pcie, CTRL_CONFIG_REG);
797 reg &= ~(CTRL_MODE_MASK << CTRL_MODE_SHIFT);
798 reg |= ((PCIE_CORE_MODE_DIRECT & CTRL_MODE_MASK) << CTRL_MODE_SHIFT);
799 advk_writel(pcie, reg, CTRL_CONFIG_REG);
801 /* Set PCI global control register to RC mode */
802 reg = advk_readl(pcie, PCIE_CORE_CTRL0_REG);
803 reg |= (IS_RC_MSK << IS_RC_SHIFT);
804 advk_writel(pcie, reg, PCIE_CORE_CTRL0_REG);
807 * Replace incorrect PCI vendor id value 0x1b4b by correct value 0x11ab.
808 * VENDOR_ID_REG contains vendor id in low 16 bits and subsystem vendor
809 * id in high 16 bits. Updating this register changes readback value of
810 * read-only vendor id bits in PCIE_CORE_DEV_ID_REG register. Workaround
811 * for erratum 4.1: "The value of device and vendor ID is incorrect".
813 advk_writel(pcie, 0x11ab11ab, VENDOR_ID_REG);
816 * Change Class Code of PCI Bridge device to PCI Bridge (0x600400),
817 * because default value is Mass Storage Controller (0x010400), causing
818 * U-Boot to fail to recognize it as P2P Bridge.
820 * Note that this Aardvark PCI Bridge does not have a compliant Type 1
821 * Configuration Space and it even cannot be accessed via Aardvark's
822 * PCI config space access method. Aardvark PCI Bridge Config space is
823 * available in internal Aardvark registers starting at offset 0x0
824 * and has format of Type 0 config space.
826 * Moreover Type 0 BAR registers (ranges 0x10 - 0x28 and 0x30 - 0x34)
827 * have the same format in Marvell's specification as in PCIe
828 * specification, but their meaning is totally different (and not even
829 * the same meaning as explained in the corresponding comment in the
830 * pci_mvebu driver; aardvark is still different).
832 * So our driver converts Type 0 config space to Type 1 and reports
833 * Header Type as Type 1. Access to BAR registers and to non-existent
834 * Type 1 registers is redirected to the virtual cfgcache[] buffer,
835 * which avoids changing unrelated registers.
837 reg = advk_readl(pcie, PCIE_CORE_DEV_REV_REG);
839 reg |= (PCI_CLASS_BRIDGE_PCI << 8) << 8;
840 advk_writel(pcie, reg, PCIE_CORE_DEV_REV_REG);
842 /* Set Advanced Error Capabilities and Control PF0 register */
843 reg = PCIE_CORE_ERR_CAPCTL_ECRC_CHK_TX |
844 PCIE_CORE_ERR_CAPCTL_ECRC_CHK_TX_EN |
845 PCIE_CORE_ERR_CAPCTL_ECRC_CHECK |
846 PCIE_CORE_ERR_CAPCTL_ECRC_CHECK_RCV;
847 advk_writel(pcie, reg, PCIE_CORE_ERR_CAPCTL_REG);
849 /* Set PCIe Device Control and Status 1 PF0 register */
850 reg = PCIE_CORE_DEV_CTRL_STATS_RELAX_ORDER_DISABLE |
851 (PCIE_CORE_DEV_CTRL_STATS_MAX_PAYLOAD_SIZE <<
852 PCIE_CORE_DEV_CTRL_STATS_MAX_PAYLOAD_SIZE_SHIFT) |
853 (PCIE_CORE_DEV_CTRL_STATS_MAX_RD_REQ_SIZE <<
854 PCIE_CORE_DEV_CTRL_STATS_MAX_RD_REQ_SIZE_SHIFT) |
855 PCIE_CORE_DEV_CTRL_STATS_SNOOP_DISABLE;
856 advk_writel(pcie, reg, PCIE_CORE_DEV_CTRL_STATS_REG);
858 /* Program PCIe Control 2 to disable strict ordering */
859 reg = PCIE_CORE_CTRL2_RESERVED |
860 PCIE_CORE_CTRL2_TD_ENABLE;
861 advk_writel(pcie, reg, PCIE_CORE_CTRL2_REG);
864 reg = advk_readl(pcie, PCIE_CORE_CTRL0_REG);
865 reg &= ~PCIE_GEN_SEL_MSK;
867 advk_writel(pcie, reg, PCIE_CORE_CTRL0_REG);
870 reg = advk_readl(pcie, PCIE_CORE_CTRL0_REG);
871 reg &= ~LANE_CNT_MSK;
873 advk_writel(pcie, reg, PCIE_CORE_CTRL0_REG);
875 /* Enable link training */
876 reg = advk_readl(pcie, PCIE_CORE_CTRL0_REG);
877 reg |= LINK_TRAINING_EN;
878 advk_writel(pcie, reg, PCIE_CORE_CTRL0_REG);
881 * Enable AXI address window location generation:
882 * When it is enabled, the default outbound window
883 * configurations (Default User Field: 0xD0074CFC)
884 * are used to transparent address translation for
885 * the outbound transactions. Thus, PCIe address
886 * windows are not required for transparent memory
887 * access when default outbound window configuration
888 * is set for memory access.
890 reg = advk_readl(pcie, PCIE_CORE_CTRL2_REG);
891 reg |= PCIE_CORE_CTRL2_ADDRWIN_MAP_ENABLE;
892 advk_writel(pcie, reg, PCIE_CORE_CTRL2_REG);
895 * Bypass the address window mapping for PIO:
896 * Since PIO access already contains all required
897 * info over AXI interface by PIO registers, the
898 * address window is not required.
900 reg = advk_readl(pcie, PIO_CTRL);
901 reg |= PIO_CTRL_ADDR_WIN_DISABLE;
902 advk_writel(pcie, reg, PIO_CTRL);
905 * Set memory access in Default User Field so it
906 * is not required to configure PCIe address for
907 * transparent memory access.
909 advk_writel(pcie, OB_WIN_TYPE_MEM, OB_WIN_DEFAULT_ACTIONS);
912 * Configure PCIe address windows for non-memory or
913 * non-transparent access as by default PCIe uses
914 * transparent memory access.
917 pci_get_regions(pcie->dev, &io, &mem, &pref);
919 pcie_advk_set_ob_region(pcie, &wins, io, OB_WIN_TYPE_IO);
920 if (mem && mem->phys_start != mem->bus_start)
921 pcie_advk_set_ob_region(pcie, &wins, mem, OB_WIN_TYPE_MEM);
922 if (pref && pref->phys_start != pref->bus_start)
923 pcie_advk_set_ob_region(pcie, &wins, pref, OB_WIN_TYPE_MEM);
925 /* Disable remaining PCIe outbound windows */
926 for (i = ((wins >= 0) ? wins : 0); i < OB_WIN_COUNT; i++)
927 pcie_advk_disable_ob_win(pcie, i);
932 /* Wait for PCIe link up */
933 if (pcie_advk_wait_for_link(pcie))
940 * pcie_advk_probe() - Probe the PCIe bus for active link
942 * @dev: A pointer to the device being operated on
944 * Probe for an active link on the PCIe bus and configure the controller
945 * to enable this port.
947 * Return: 0 on success, else -ENODEV
949 static int pcie_advk_probe(struct udevice *dev)
951 struct pcie_advk *pcie = dev_get_priv(dev);
953 gpio_request_by_name(dev, "reset-gpios", 0, &pcie->reset_gpio,
956 * Issue reset to add-in card through the dedicated GPIO.
957 * Some boards are connecting the card reset pin to common system
958 * reset wire and others are using separate GPIO port.
959 * In the last case we have to release a reset of the addon card
963 * The PCIe RESET signal is not supposed to be released along
964 * with the SOC RESET signal. It should be lowered as early as
965 * possible before PCIe PHY initialization. Moreover, the PCIe
966 * clock should be gated as well.
968 if (dm_gpio_is_valid(&pcie->reset_gpio)) {
969 dev_dbg(dev, "Toggle PCIE Reset GPIO ...\n");
970 dm_gpio_set_value(&pcie->reset_gpio, 1);
972 dm_gpio_set_value(&pcie->reset_gpio, 0);
974 dev_warn(dev, "PCIE Reset on GPIO support is missing\n");
977 pcie->dev = pci_get_controller(dev);
979 /* PCI Bridge support 32-bit I/O and 64-bit prefetch mem addressing */
980 pcie->cfgcache[(PCI_IO_BASE - 0x10) / 4] =
981 PCI_IO_RANGE_TYPE_32 | (PCI_IO_RANGE_TYPE_32 << 8);
982 pcie->cfgcache[(PCI_PREF_MEMORY_BASE - 0x10) / 4] =
983 PCI_PREF_RANGE_TYPE_64 | (PCI_PREF_RANGE_TYPE_64 << 16);
985 return pcie_advk_setup_hw(pcie);
988 static int pcie_advk_remove(struct udevice *dev)
990 struct pcie_advk *pcie = dev_get_priv(dev);
994 for (i = 0; i < OB_WIN_COUNT; i++)
995 pcie_advk_disable_ob_win(pcie, i);
997 reg = advk_readl(pcie, PCIE_CORE_CMD_STATUS_REG);
998 reg &= ~(PCIE_CORE_CMD_MEM_ACCESS_EN |
999 PCIE_CORE_CMD_IO_ACCESS_EN |
1000 PCIE_CORE_CMD_MEM_IO_REQ_EN);
1001 advk_writel(pcie, reg, PCIE_CORE_CMD_STATUS_REG);
1003 reg = advk_readl(pcie, PCIE_CORE_CTRL0_REG);
1004 reg &= ~LINK_TRAINING_EN;
1005 advk_writel(pcie, reg, PCIE_CORE_CTRL0_REG);
1011 * pcie_advk_of_to_plat() - Translate from DT to device state
1013 * @dev: A pointer to the device being operated on
1015 * Translate relevant data from the device tree pertaining to device @dev into
1016 * state that the driver will later make use of. This state is stored in the
1017 * device's private data structure.
1019 * Return: 0 on success, else -EINVAL
1021 static int pcie_advk_of_to_plat(struct udevice *dev)
1023 struct pcie_advk *pcie = dev_get_priv(dev);
1025 /* Get the register base address */
1026 pcie->base = (void *)dev_read_addr_index(dev, 0);
1027 if ((fdt_addr_t)pcie->base == FDT_ADDR_T_NONE)
1033 static const struct dm_pci_ops pcie_advk_ops = {
1034 .read_config = pcie_advk_read_config,
1035 .write_config = pcie_advk_write_config,
1038 static const struct udevice_id pcie_advk_ids[] = {
1039 { .compatible = "marvell,armada-3700-pcie" },
1043 U_BOOT_DRIVER(pcie_advk) = {
1044 .name = "pcie_advk",
1046 .of_match = pcie_advk_ids,
1047 .ops = &pcie_advk_ops,
1048 .of_to_plat = pcie_advk_of_to_plat,
1049 .probe = pcie_advk_probe,
1050 .remove = pcie_advk_remove,
1051 .flags = DM_FLAG_OS_PREPARE,
1052 .priv_auto = sizeof(struct pcie_advk),