2 * PCIe host controller driver for Tegra SoCs
4 * Copyright (c) 2010, CompuLab, Ltd.
5 * Author: Mike Rapoport <mike@compulab.co.il>
7 * Based on NVIDIA PCIe driver
8 * Copyright (c) 2008-2009, NVIDIA Corporation.
10 * Bits taken from arch/arm/mach-dove/pcie.c
12 * Author: Thierry Reding <treding@nvidia.com>
14 * This program is free software; you can redistribute it and/or modify
15 * it under the terms of the GNU General Public License as published by
16 * the Free Software Foundation; either version 2 of the License, or
17 * (at your option) any later version.
19 * This program is distributed in the hope that it will be useful, but WITHOUT
20 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
21 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
24 * You should have received a copy of the GNU General Public License along
25 * with this program; if not, write to the Free Software Foundation, Inc.,
26 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
29 #include <linux/clk.h>
30 #include <linux/debugfs.h>
31 #include <linux/delay.h>
32 #include <linux/export.h>
33 #include <linux/interrupt.h>
34 #include <linux/irq.h>
35 #include <linux/irqdomain.h>
36 #include <linux/kernel.h>
37 #include <linux/init.h>
38 #include <linux/msi.h>
39 #include <linux/of_address.h>
40 #include <linux/of_pci.h>
41 #include <linux/of_platform.h>
42 #include <linux/pci.h>
43 #include <linux/phy/phy.h>
44 #include <linux/platform_device.h>
45 #include <linux/reset.h>
46 #include <linux/sizes.h>
47 #include <linux/slab.h>
48 #include <linux/vmalloc.h>
49 #include <linux/regulator/consumer.h>
51 #include <soc/tegra/cpuidle.h>
52 #include <soc/tegra/pmc.h>
54 #include <asm/mach/irq.h>
55 #include <asm/mach/map.h>
56 #include <asm/mach/pci.h>
58 #define INT_PCI_MSI_NR (8 * 32)
60 /* register definitions */
62 #define AFI_AXI_BAR0_SZ 0x00
63 #define AFI_AXI_BAR1_SZ 0x04
64 #define AFI_AXI_BAR2_SZ 0x08
65 #define AFI_AXI_BAR3_SZ 0x0c
66 #define AFI_AXI_BAR4_SZ 0x10
67 #define AFI_AXI_BAR5_SZ 0x14
69 #define AFI_AXI_BAR0_START 0x18
70 #define AFI_AXI_BAR1_START 0x1c
71 #define AFI_AXI_BAR2_START 0x20
72 #define AFI_AXI_BAR3_START 0x24
73 #define AFI_AXI_BAR4_START 0x28
74 #define AFI_AXI_BAR5_START 0x2c
76 #define AFI_FPCI_BAR0 0x30
77 #define AFI_FPCI_BAR1 0x34
78 #define AFI_FPCI_BAR2 0x38
79 #define AFI_FPCI_BAR3 0x3c
80 #define AFI_FPCI_BAR4 0x40
81 #define AFI_FPCI_BAR5 0x44
83 #define AFI_CACHE_BAR0_SZ 0x48
84 #define AFI_CACHE_BAR0_ST 0x4c
85 #define AFI_CACHE_BAR1_SZ 0x50
86 #define AFI_CACHE_BAR1_ST 0x54
88 #define AFI_MSI_BAR_SZ 0x60
89 #define AFI_MSI_FPCI_BAR_ST 0x64
90 #define AFI_MSI_AXI_BAR_ST 0x68
92 #define AFI_MSI_VEC0 0x6c
93 #define AFI_MSI_VEC1 0x70
94 #define AFI_MSI_VEC2 0x74
95 #define AFI_MSI_VEC3 0x78
96 #define AFI_MSI_VEC4 0x7c
97 #define AFI_MSI_VEC5 0x80
98 #define AFI_MSI_VEC6 0x84
99 #define AFI_MSI_VEC7 0x88
101 #define AFI_MSI_EN_VEC0 0x8c
102 #define AFI_MSI_EN_VEC1 0x90
103 #define AFI_MSI_EN_VEC2 0x94
104 #define AFI_MSI_EN_VEC3 0x98
105 #define AFI_MSI_EN_VEC4 0x9c
106 #define AFI_MSI_EN_VEC5 0xa0
107 #define AFI_MSI_EN_VEC6 0xa4
108 #define AFI_MSI_EN_VEC7 0xa8
110 #define AFI_CONFIGURATION 0xac
111 #define AFI_CONFIGURATION_EN_FPCI (1 << 0)
113 #define AFI_FPCI_ERROR_MASKS 0xb0
115 #define AFI_INTR_MASK 0xb4
116 #define AFI_INTR_MASK_INT_MASK (1 << 0)
117 #define AFI_INTR_MASK_MSI_MASK (1 << 8)
119 #define AFI_INTR_CODE 0xb8
120 #define AFI_INTR_CODE_MASK 0xf
121 #define AFI_INTR_INI_SLAVE_ERROR 1
122 #define AFI_INTR_INI_DECODE_ERROR 2
123 #define AFI_INTR_TARGET_ABORT 3
124 #define AFI_INTR_MASTER_ABORT 4
125 #define AFI_INTR_INVALID_WRITE 5
126 #define AFI_INTR_LEGACY 6
127 #define AFI_INTR_FPCI_DECODE_ERROR 7
128 #define AFI_INTR_AXI_DECODE_ERROR 8
129 #define AFI_INTR_FPCI_TIMEOUT 9
130 #define AFI_INTR_PE_PRSNT_SENSE 10
131 #define AFI_INTR_PE_CLKREQ_SENSE 11
132 #define AFI_INTR_CLKCLAMP_SENSE 12
133 #define AFI_INTR_RDY4PD_SENSE 13
134 #define AFI_INTR_P2P_ERROR 14
136 #define AFI_INTR_SIGNATURE 0xbc
137 #define AFI_UPPER_FPCI_ADDRESS 0xc0
138 #define AFI_SM_INTR_ENABLE 0xc4
139 #define AFI_SM_INTR_INTA_ASSERT (1 << 0)
140 #define AFI_SM_INTR_INTB_ASSERT (1 << 1)
141 #define AFI_SM_INTR_INTC_ASSERT (1 << 2)
142 #define AFI_SM_INTR_INTD_ASSERT (1 << 3)
143 #define AFI_SM_INTR_INTA_DEASSERT (1 << 4)
144 #define AFI_SM_INTR_INTB_DEASSERT (1 << 5)
145 #define AFI_SM_INTR_INTC_DEASSERT (1 << 6)
146 #define AFI_SM_INTR_INTD_DEASSERT (1 << 7)
148 #define AFI_AFI_INTR_ENABLE 0xc8
149 #define AFI_INTR_EN_INI_SLVERR (1 << 0)
150 #define AFI_INTR_EN_INI_DECERR (1 << 1)
151 #define AFI_INTR_EN_TGT_SLVERR (1 << 2)
152 #define AFI_INTR_EN_TGT_DECERR (1 << 3)
153 #define AFI_INTR_EN_TGT_WRERR (1 << 4)
154 #define AFI_INTR_EN_DFPCI_DECERR (1 << 5)
155 #define AFI_INTR_EN_AXI_DECERR (1 << 6)
156 #define AFI_INTR_EN_FPCI_TIMEOUT (1 << 7)
157 #define AFI_INTR_EN_PRSNT_SENSE (1 << 8)
159 #define AFI_PCIE_CONFIG 0x0f8
160 #define AFI_PCIE_CONFIG_PCIE_DISABLE(x) (1 << ((x) + 1))
161 #define AFI_PCIE_CONFIG_PCIE_DISABLE_ALL 0xe
162 #define AFI_PCIE_CONFIG_SM2TMS0_XBAR_CONFIG_MASK (0xf << 20)
163 #define AFI_PCIE_CONFIG_SM2TMS0_XBAR_CONFIG_SINGLE (0x0 << 20)
164 #define AFI_PCIE_CONFIG_SM2TMS0_XBAR_CONFIG_420 (0x0 << 20)
165 #define AFI_PCIE_CONFIG_SM2TMS0_XBAR_CONFIG_X2_X1 (0x0 << 20)
166 #define AFI_PCIE_CONFIG_SM2TMS0_XBAR_CONFIG_DUAL (0x1 << 20)
167 #define AFI_PCIE_CONFIG_SM2TMS0_XBAR_CONFIG_222 (0x1 << 20)
168 #define AFI_PCIE_CONFIG_SM2TMS0_XBAR_CONFIG_X4_X1 (0x1 << 20)
169 #define AFI_PCIE_CONFIG_SM2TMS0_XBAR_CONFIG_411 (0x2 << 20)
171 #define AFI_FUSE 0x104
172 #define AFI_FUSE_PCIE_T0_GEN2_DIS (1 << 2)
174 #define AFI_PEX0_CTRL 0x110
175 #define AFI_PEX1_CTRL 0x118
176 #define AFI_PEX2_CTRL 0x128
177 #define AFI_PEX_CTRL_RST (1 << 0)
178 #define AFI_PEX_CTRL_CLKREQ_EN (1 << 1)
179 #define AFI_PEX_CTRL_REFCLK_EN (1 << 3)
180 #define AFI_PEX_CTRL_OVERRIDE_EN (1 << 4)
182 #define AFI_PLLE_CONTROL 0x160
183 #define AFI_PLLE_CONTROL_BYPASS_PADS2PLLE_CONTROL (1 << 9)
184 #define AFI_PLLE_CONTROL_PADS2PLLE_CONTROL_EN (1 << 1)
186 #define AFI_PEXBIAS_CTRL_0 0x168
188 #define RP_VEND_XP 0x00000f00
189 #define RP_VEND_XP_DL_UP (1 << 30)
191 #define RP_VEND_CTL2 0x00000fa8
192 #define RP_VEND_CTL2_PCA_ENABLE (1 << 7)
194 #define RP_PRIV_MISC 0x00000fe0
195 #define RP_PRIV_MISC_PRSNT_MAP_EP_PRSNT (0xe << 0)
196 #define RP_PRIV_MISC_PRSNT_MAP_EP_ABSNT (0xf << 0)
198 #define RP_LINK_CONTROL_STATUS 0x00000090
199 #define RP_LINK_CONTROL_STATUS_DL_LINK_ACTIVE 0x20000000
200 #define RP_LINK_CONTROL_STATUS_LINKSTAT_MASK 0x3fff0000
202 #define PADS_CTL_SEL 0x0000009c
204 #define PADS_CTL 0x000000a0
205 #define PADS_CTL_IDDQ_1L (1 << 0)
206 #define PADS_CTL_TX_DATA_EN_1L (1 << 6)
207 #define PADS_CTL_RX_DATA_EN_1L (1 << 10)
209 #define PADS_PLL_CTL_TEGRA20 0x000000b8
210 #define PADS_PLL_CTL_TEGRA30 0x000000b4
211 #define PADS_PLL_CTL_RST_B4SM (1 << 1)
212 #define PADS_PLL_CTL_LOCKDET (1 << 8)
213 #define PADS_PLL_CTL_REFCLK_MASK (0x3 << 16)
214 #define PADS_PLL_CTL_REFCLK_INTERNAL_CML (0 << 16)
215 #define PADS_PLL_CTL_REFCLK_INTERNAL_CMOS (1 << 16)
216 #define PADS_PLL_CTL_REFCLK_EXTERNAL (2 << 16)
217 #define PADS_PLL_CTL_TXCLKREF_MASK (0x1 << 20)
218 #define PADS_PLL_CTL_TXCLKREF_DIV10 (0 << 20)
219 #define PADS_PLL_CTL_TXCLKREF_DIV5 (1 << 20)
220 #define PADS_PLL_CTL_TXCLKREF_BUF_EN (1 << 22)
222 #define PADS_REFCLK_CFG0 0x000000c8
223 #define PADS_REFCLK_CFG1 0x000000cc
224 #define PADS_REFCLK_BIAS 0x000000d0
227 * Fields in PADS_REFCLK_CFG*. Those registers form an array of 16-bit
228 * entries, one entry per PCIe port. These field definitions and desired
229 * values aren't in the TRM, but do come from NVIDIA.
231 #define PADS_REFCLK_CFG_TERM_SHIFT 2 /* 6:2 */
232 #define PADS_REFCLK_CFG_E_TERM_SHIFT 7
233 #define PADS_REFCLK_CFG_PREDI_SHIFT 8 /* 11:8 */
234 #define PADS_REFCLK_CFG_DRVI_SHIFT 12 /* 15:12 */
237 struct msi_controller chip;
238 DECLARE_BITMAP(used, INT_PCI_MSI_NR);
239 struct irq_domain *domain;
245 /* used to differentiate between Tegra SoC generations */
246 struct tegra_pcie_soc {
247 unsigned int num_ports;
248 unsigned int msi_base_shift;
251 u32 pads_refclk_cfg0;
252 u32 pads_refclk_cfg1;
253 bool has_pex_clkreq_en;
254 bool has_pex_bias_ctrl;
255 bool has_intr_prsnt_sense;
258 bool force_pca_enable;
261 static inline struct tegra_msi *to_tegra_msi(struct msi_controller *chip)
263 return container_of(chip, struct tegra_msi, chip);
273 struct list_head buses;
279 struct resource prefetch;
280 struct resource busn;
292 struct reset_control *pex_rst;
293 struct reset_control *afi_rst;
294 struct reset_control *pcie_xrst;
299 struct tegra_msi msi;
301 struct list_head ports;
304 struct regulator_bulk_data *supplies;
305 unsigned int num_supplies;
307 const struct tegra_pcie_soc *soc;
308 struct dentry *debugfs;
311 struct tegra_pcie_port {
312 struct tegra_pcie *pcie;
313 struct device_node *np;
314 struct list_head list;
315 struct resource regs;
323 struct tegra_pcie_bus {
324 struct vm_struct *area;
325 struct list_head list;
329 static inline void afi_writel(struct tegra_pcie *pcie, u32 value,
330 unsigned long offset)
332 writel(value, pcie->afi + offset);
335 static inline u32 afi_readl(struct tegra_pcie *pcie, unsigned long offset)
337 return readl(pcie->afi + offset);
340 static inline void pads_writel(struct tegra_pcie *pcie, u32 value,
341 unsigned long offset)
343 writel(value, pcie->pads + offset);
346 static inline u32 pads_readl(struct tegra_pcie *pcie, unsigned long offset)
348 return readl(pcie->pads + offset);
352 * The configuration space mapping on Tegra is somewhat similar to the ECAM
353 * defined by PCIe. However it deviates a bit in how the 4 bits for extended
354 * register accesses are mapped:
356 * [27:24] extended register number
358 * [15:11] device number
359 * [10: 8] function number
360 * [ 7: 0] register number
362 * Mapping the whole extended configuration space would require 256 MiB of
363 * virtual address space, only a small part of which will actually be used.
364 * To work around this, a 1 MiB of virtual addresses are allocated per bus
365 * when the bus is first accessed. When the physical range is mapped, the
366 * the bus number bits are hidden so that the extended register number bits
367 * appear as bits [19:16]. Therefore the virtual mapping looks like this:
369 * [19:16] extended register number
370 * [15:11] device number
371 * [10: 8] function number
372 * [ 7: 0] register number
374 * This is achieved by stitching together 16 chunks of 64 KiB of physical
375 * address space via the MMU.
377 static unsigned long tegra_pcie_conf_offset(unsigned int devfn, int where)
379 return ((where & 0xf00) << 8) | (PCI_SLOT(devfn) << 11) |
380 (PCI_FUNC(devfn) << 8) | (where & 0xfc);
383 static struct tegra_pcie_bus *tegra_pcie_bus_alloc(struct tegra_pcie *pcie,
386 struct device *dev = pcie->dev;
387 pgprot_t prot = __pgprot(L_PTE_PRESENT | L_PTE_YOUNG | L_PTE_DIRTY |
388 L_PTE_XN | L_PTE_MT_DEV_SHARED | L_PTE_SHARED);
389 phys_addr_t cs = pcie->cs->start;
390 struct tegra_pcie_bus *bus;
394 bus = kzalloc(sizeof(*bus), GFP_KERNEL);
396 return ERR_PTR(-ENOMEM);
398 INIT_LIST_HEAD(&bus->list);
401 /* allocate 1 MiB of virtual addresses */
402 bus->area = get_vm_area(SZ_1M, VM_IOREMAP);
408 /* map each of the 16 chunks of 64 KiB each */
409 for (i = 0; i < 16; i++) {
410 unsigned long virt = (unsigned long)bus->area->addr +
412 phys_addr_t phys = cs + i * SZ_16M + busnr * SZ_64K;
414 err = ioremap_page_range(virt, virt + SZ_64K, phys, prot);
416 dev_err(dev, "ioremap_page_range() failed: %d\n", err);
424 vunmap(bus->area->addr);
430 static int tegra_pcie_add_bus(struct pci_bus *bus)
432 struct pci_host_bridge *host = pci_find_host_bridge(bus);
433 struct tegra_pcie *pcie = pci_host_bridge_priv(host);
434 struct tegra_pcie_bus *b;
436 b = tegra_pcie_bus_alloc(pcie, bus->number);
440 list_add_tail(&b->list, &pcie->buses);
445 static void tegra_pcie_remove_bus(struct pci_bus *child)
447 struct pci_host_bridge *host = pci_find_host_bridge(child);
448 struct tegra_pcie *pcie = pci_host_bridge_priv(host);
449 struct tegra_pcie_bus *bus, *tmp;
451 list_for_each_entry_safe(bus, tmp, &pcie->buses, list) {
452 if (bus->nr == child->number) {
453 vunmap(bus->area->addr);
454 list_del(&bus->list);
461 static void __iomem *tegra_pcie_map_bus(struct pci_bus *bus,
465 struct pci_host_bridge *host = pci_find_host_bridge(bus);
466 struct tegra_pcie *pcie = pci_host_bridge_priv(host);
467 struct device *dev = pcie->dev;
468 void __iomem *addr = NULL;
470 if (bus->number == 0) {
471 unsigned int slot = PCI_SLOT(devfn);
472 struct tegra_pcie_port *port;
474 list_for_each_entry(port, &pcie->ports, list) {
475 if (port->index + 1 == slot) {
476 addr = port->base + (where & ~3);
481 struct tegra_pcie_bus *b;
483 list_for_each_entry(b, &pcie->buses, list)
484 if (b->nr == bus->number)
485 addr = (void __iomem *)b->area->addr;
488 dev_err(dev, "failed to map cfg. space for bus %u\n",
493 addr += tegra_pcie_conf_offset(devfn, where);
499 static struct pci_ops tegra_pcie_ops = {
500 .add_bus = tegra_pcie_add_bus,
501 .remove_bus = tegra_pcie_remove_bus,
502 .map_bus = tegra_pcie_map_bus,
503 .read = pci_generic_config_read32,
504 .write = pci_generic_config_write32,
507 static unsigned long tegra_pcie_port_get_pex_ctrl(struct tegra_pcie_port *port)
509 unsigned long ret = 0;
511 switch (port->index) {
528 static void tegra_pcie_port_reset(struct tegra_pcie_port *port)
530 unsigned long ctrl = tegra_pcie_port_get_pex_ctrl(port);
533 /* pulse reset signal */
534 value = afi_readl(port->pcie, ctrl);
535 value &= ~AFI_PEX_CTRL_RST;
536 afi_writel(port->pcie, value, ctrl);
538 usleep_range(1000, 2000);
540 value = afi_readl(port->pcie, ctrl);
541 value |= AFI_PEX_CTRL_RST;
542 afi_writel(port->pcie, value, ctrl);
545 static void tegra_pcie_port_enable(struct tegra_pcie_port *port)
547 unsigned long ctrl = tegra_pcie_port_get_pex_ctrl(port);
548 const struct tegra_pcie_soc *soc = port->pcie->soc;
551 /* enable reference clock */
552 value = afi_readl(port->pcie, ctrl);
553 value |= AFI_PEX_CTRL_REFCLK_EN;
555 if (soc->has_pex_clkreq_en)
556 value |= AFI_PEX_CTRL_CLKREQ_EN;
558 value |= AFI_PEX_CTRL_OVERRIDE_EN;
560 afi_writel(port->pcie, value, ctrl);
562 tegra_pcie_port_reset(port);
564 if (soc->force_pca_enable) {
565 value = readl(port->base + RP_VEND_CTL2);
566 value |= RP_VEND_CTL2_PCA_ENABLE;
567 writel(value, port->base + RP_VEND_CTL2);
571 static void tegra_pcie_port_disable(struct tegra_pcie_port *port)
573 unsigned long ctrl = tegra_pcie_port_get_pex_ctrl(port);
574 const struct tegra_pcie_soc *soc = port->pcie->soc;
577 /* assert port reset */
578 value = afi_readl(port->pcie, ctrl);
579 value &= ~AFI_PEX_CTRL_RST;
580 afi_writel(port->pcie, value, ctrl);
582 /* disable reference clock */
583 value = afi_readl(port->pcie, ctrl);
585 if (soc->has_pex_clkreq_en)
586 value &= ~AFI_PEX_CTRL_CLKREQ_EN;
588 value &= ~AFI_PEX_CTRL_REFCLK_EN;
589 afi_writel(port->pcie, value, ctrl);
592 static void tegra_pcie_port_free(struct tegra_pcie_port *port)
594 struct tegra_pcie *pcie = port->pcie;
595 struct device *dev = pcie->dev;
597 devm_iounmap(dev, port->base);
598 devm_release_mem_region(dev, port->regs.start,
599 resource_size(&port->regs));
600 list_del(&port->list);
601 devm_kfree(dev, port);
604 /* Tegra PCIE root complex wrongly reports device class */
605 static void tegra_pcie_fixup_class(struct pci_dev *dev)
607 dev->class = PCI_CLASS_BRIDGE_PCI << 8;
609 DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_NVIDIA, 0x0bf0, tegra_pcie_fixup_class);
610 DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_NVIDIA, 0x0bf1, tegra_pcie_fixup_class);
611 DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_NVIDIA, 0x0e1c, tegra_pcie_fixup_class);
612 DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_NVIDIA, 0x0e1d, tegra_pcie_fixup_class);
614 /* Tegra PCIE requires relaxed ordering */
615 static void tegra_pcie_relax_enable(struct pci_dev *dev)
617 pcie_capability_set_word(dev, PCI_EXP_DEVCTL, PCI_EXP_DEVCTL_RELAX_EN);
619 DECLARE_PCI_FIXUP_FINAL(PCI_ANY_ID, PCI_ANY_ID, tegra_pcie_relax_enable);
621 static int tegra_pcie_request_resources(struct tegra_pcie *pcie)
623 struct pci_host_bridge *host = pci_host_bridge_from_priv(pcie);
624 struct list_head *windows = &host->windows;
625 struct device *dev = pcie->dev;
628 pci_add_resource_offset(windows, &pcie->pio, pcie->offset.io);
629 pci_add_resource_offset(windows, &pcie->mem, pcie->offset.mem);
630 pci_add_resource_offset(windows, &pcie->prefetch, pcie->offset.mem);
631 pci_add_resource(windows, &pcie->busn);
633 err = devm_request_pci_bus_resources(dev, windows);
637 pci_remap_iospace(&pcie->pio, pcie->io.start);
642 static int tegra_pcie_map_irq(const struct pci_dev *pdev, u8 slot, u8 pin)
644 struct pci_host_bridge *host = pci_find_host_bridge(pdev->bus);
645 struct tegra_pcie *pcie = pci_host_bridge_priv(host);
648 tegra_cpuidle_pcie_irqs_in_use();
650 irq = of_irq_parse_and_map_pci(pdev, slot, pin);
657 static irqreturn_t tegra_pcie_isr(int irq, void *arg)
659 const char *err_msg[] = {
667 "Response decoding error",
668 "AXI response decoding error",
669 "Transaction timeout",
670 "Slot present pin change",
671 "Slot clock request change",
672 "TMS clock ramp change",
673 "TMS ready for power down",
676 struct tegra_pcie *pcie = arg;
677 struct device *dev = pcie->dev;
680 code = afi_readl(pcie, AFI_INTR_CODE) & AFI_INTR_CODE_MASK;
681 signature = afi_readl(pcie, AFI_INTR_SIGNATURE);
682 afi_writel(pcie, 0, AFI_INTR_CODE);
684 if (code == AFI_INTR_LEGACY)
687 if (code >= ARRAY_SIZE(err_msg))
691 * do not pollute kernel log with master abort reports since they
692 * happen a lot during enumeration
694 if (code == AFI_INTR_MASTER_ABORT)
695 dev_dbg(dev, "%s, signature: %08x\n", err_msg[code], signature);
697 dev_err(dev, "%s, signature: %08x\n", err_msg[code], signature);
699 if (code == AFI_INTR_TARGET_ABORT || code == AFI_INTR_MASTER_ABORT ||
700 code == AFI_INTR_FPCI_DECODE_ERROR) {
701 u32 fpci = afi_readl(pcie, AFI_UPPER_FPCI_ADDRESS) & 0xff;
702 u64 address = (u64)fpci << 32 | (signature & 0xfffffffc);
704 if (code == AFI_INTR_MASTER_ABORT)
705 dev_dbg(dev, " FPCI address: %10llx\n", address);
707 dev_err(dev, " FPCI address: %10llx\n", address);
714 * FPCI map is as follows:
715 * - 0xfdfc000000: I/O space
716 * - 0xfdfe000000: type 0 configuration space
717 * - 0xfdff000000: type 1 configuration space
718 * - 0xfe00000000: type 0 extended configuration space
719 * - 0xfe10000000: type 1 extended configuration space
721 static void tegra_pcie_setup_translations(struct tegra_pcie *pcie)
723 u32 fpci_bar, size, axi_address;
725 /* Bar 0: type 1 extended configuration space */
726 fpci_bar = 0xfe100000;
727 size = resource_size(pcie->cs);
728 axi_address = pcie->cs->start;
729 afi_writel(pcie, axi_address, AFI_AXI_BAR0_START);
730 afi_writel(pcie, size >> 12, AFI_AXI_BAR0_SZ);
731 afi_writel(pcie, fpci_bar, AFI_FPCI_BAR0);
733 /* Bar 1: downstream IO bar */
734 fpci_bar = 0xfdfc0000;
735 size = resource_size(&pcie->io);
736 axi_address = pcie->io.start;
737 afi_writel(pcie, axi_address, AFI_AXI_BAR1_START);
738 afi_writel(pcie, size >> 12, AFI_AXI_BAR1_SZ);
739 afi_writel(pcie, fpci_bar, AFI_FPCI_BAR1);
741 /* Bar 2: prefetchable memory BAR */
742 fpci_bar = (((pcie->prefetch.start >> 12) & 0x0fffffff) << 4) | 0x1;
743 size = resource_size(&pcie->prefetch);
744 axi_address = pcie->prefetch.start;
745 afi_writel(pcie, axi_address, AFI_AXI_BAR2_START);
746 afi_writel(pcie, size >> 12, AFI_AXI_BAR2_SZ);
747 afi_writel(pcie, fpci_bar, AFI_FPCI_BAR2);
749 /* Bar 3: non prefetchable memory BAR */
750 fpci_bar = (((pcie->mem.start >> 12) & 0x0fffffff) << 4) | 0x1;
751 size = resource_size(&pcie->mem);
752 axi_address = pcie->mem.start;
753 afi_writel(pcie, axi_address, AFI_AXI_BAR3_START);
754 afi_writel(pcie, size >> 12, AFI_AXI_BAR3_SZ);
755 afi_writel(pcie, fpci_bar, AFI_FPCI_BAR3);
757 /* NULL out the remaining BARs as they are not used */
758 afi_writel(pcie, 0, AFI_AXI_BAR4_START);
759 afi_writel(pcie, 0, AFI_AXI_BAR4_SZ);
760 afi_writel(pcie, 0, AFI_FPCI_BAR4);
762 afi_writel(pcie, 0, AFI_AXI_BAR5_START);
763 afi_writel(pcie, 0, AFI_AXI_BAR5_SZ);
764 afi_writel(pcie, 0, AFI_FPCI_BAR5);
766 /* map all upstream transactions as uncached */
767 afi_writel(pcie, 0, AFI_CACHE_BAR0_ST);
768 afi_writel(pcie, 0, AFI_CACHE_BAR0_SZ);
769 afi_writel(pcie, 0, AFI_CACHE_BAR1_ST);
770 afi_writel(pcie, 0, AFI_CACHE_BAR1_SZ);
772 /* MSI translations are setup only when needed */
773 afi_writel(pcie, 0, AFI_MSI_FPCI_BAR_ST);
774 afi_writel(pcie, 0, AFI_MSI_BAR_SZ);
775 afi_writel(pcie, 0, AFI_MSI_AXI_BAR_ST);
776 afi_writel(pcie, 0, AFI_MSI_BAR_SZ);
779 static int tegra_pcie_pll_wait(struct tegra_pcie *pcie, unsigned long timeout)
781 const struct tegra_pcie_soc *soc = pcie->soc;
784 timeout = jiffies + msecs_to_jiffies(timeout);
786 while (time_before(jiffies, timeout)) {
787 value = pads_readl(pcie, soc->pads_pll_ctl);
788 if (value & PADS_PLL_CTL_LOCKDET)
795 static int tegra_pcie_phy_enable(struct tegra_pcie *pcie)
797 struct device *dev = pcie->dev;
798 const struct tegra_pcie_soc *soc = pcie->soc;
802 /* initialize internal PHY, enable up to 16 PCIE lanes */
803 pads_writel(pcie, 0x0, PADS_CTL_SEL);
805 /* override IDDQ to 1 on all 4 lanes */
806 value = pads_readl(pcie, PADS_CTL);
807 value |= PADS_CTL_IDDQ_1L;
808 pads_writel(pcie, value, PADS_CTL);
811 * Set up PHY PLL inputs select PLLE output as refclock,
812 * set TX ref sel to div10 (not div5).
814 value = pads_readl(pcie, soc->pads_pll_ctl);
815 value &= ~(PADS_PLL_CTL_REFCLK_MASK | PADS_PLL_CTL_TXCLKREF_MASK);
816 value |= PADS_PLL_CTL_REFCLK_INTERNAL_CML | soc->tx_ref_sel;
817 pads_writel(pcie, value, soc->pads_pll_ctl);
820 value = pads_readl(pcie, soc->pads_pll_ctl);
821 value &= ~PADS_PLL_CTL_RST_B4SM;
822 pads_writel(pcie, value, soc->pads_pll_ctl);
824 usleep_range(20, 100);
826 /* take PLL out of reset */
827 value = pads_readl(pcie, soc->pads_pll_ctl);
828 value |= PADS_PLL_CTL_RST_B4SM;
829 pads_writel(pcie, value, soc->pads_pll_ctl);
831 /* wait for the PLL to lock */
832 err = tegra_pcie_pll_wait(pcie, 500);
834 dev_err(dev, "PLL failed to lock: %d\n", err);
838 /* turn off IDDQ override */
839 value = pads_readl(pcie, PADS_CTL);
840 value &= ~PADS_CTL_IDDQ_1L;
841 pads_writel(pcie, value, PADS_CTL);
843 /* enable TX/RX data */
844 value = pads_readl(pcie, PADS_CTL);
845 value |= PADS_CTL_TX_DATA_EN_1L | PADS_CTL_RX_DATA_EN_1L;
846 pads_writel(pcie, value, PADS_CTL);
851 static int tegra_pcie_phy_disable(struct tegra_pcie *pcie)
853 const struct tegra_pcie_soc *soc = pcie->soc;
856 /* disable TX/RX data */
857 value = pads_readl(pcie, PADS_CTL);
858 value &= ~(PADS_CTL_TX_DATA_EN_1L | PADS_CTL_RX_DATA_EN_1L);
859 pads_writel(pcie, value, PADS_CTL);
862 value = pads_readl(pcie, PADS_CTL);
863 value |= PADS_CTL_IDDQ_1L;
864 pads_writel(pcie, value, PADS_CTL);
867 value = pads_readl(pcie, soc->pads_pll_ctl);
868 value &= ~PADS_PLL_CTL_RST_B4SM;
869 pads_writel(pcie, value, soc->pads_pll_ctl);
871 usleep_range(20, 100);
876 static int tegra_pcie_port_phy_power_on(struct tegra_pcie_port *port)
878 struct device *dev = port->pcie->dev;
882 for (i = 0; i < port->lanes; i++) {
883 err = phy_power_on(port->phys[i]);
885 dev_err(dev, "failed to power on PHY#%u: %d\n", i, err);
893 static int tegra_pcie_port_phy_power_off(struct tegra_pcie_port *port)
895 struct device *dev = port->pcie->dev;
899 for (i = 0; i < port->lanes; i++) {
900 err = phy_power_off(port->phys[i]);
902 dev_err(dev, "failed to power off PHY#%u: %d\n", i,
911 static int tegra_pcie_phy_power_on(struct tegra_pcie *pcie)
913 struct device *dev = pcie->dev;
914 const struct tegra_pcie_soc *soc = pcie->soc;
915 struct tegra_pcie_port *port;
918 if (pcie->legacy_phy) {
920 err = phy_power_on(pcie->phy);
922 err = tegra_pcie_phy_enable(pcie);
925 dev_err(dev, "failed to power on PHY: %d\n", err);
930 list_for_each_entry(port, &pcie->ports, list) {
931 err = tegra_pcie_port_phy_power_on(port);
934 "failed to power on PCIe port %u PHY: %d\n",
940 /* Configure the reference clock driver */
941 pads_writel(pcie, soc->pads_refclk_cfg0, PADS_REFCLK_CFG0);
943 if (soc->num_ports > 2)
944 pads_writel(pcie, soc->pads_refclk_cfg1, PADS_REFCLK_CFG1);
949 static int tegra_pcie_phy_power_off(struct tegra_pcie *pcie)
951 struct device *dev = pcie->dev;
952 struct tegra_pcie_port *port;
955 if (pcie->legacy_phy) {
957 err = phy_power_off(pcie->phy);
959 err = tegra_pcie_phy_disable(pcie);
962 dev_err(dev, "failed to power off PHY: %d\n", err);
967 list_for_each_entry(port, &pcie->ports, list) {
968 err = tegra_pcie_port_phy_power_off(port);
971 "failed to power off PCIe port %u PHY: %d\n",
980 static int tegra_pcie_enable_controller(struct tegra_pcie *pcie)
982 struct device *dev = pcie->dev;
983 const struct tegra_pcie_soc *soc = pcie->soc;
984 struct tegra_pcie_port *port;
988 /* enable PLL power down */
990 value = afi_readl(pcie, AFI_PLLE_CONTROL);
991 value &= ~AFI_PLLE_CONTROL_BYPASS_PADS2PLLE_CONTROL;
992 value |= AFI_PLLE_CONTROL_PADS2PLLE_CONTROL_EN;
993 afi_writel(pcie, value, AFI_PLLE_CONTROL);
996 /* power down PCIe slot clock bias pad */
997 if (soc->has_pex_bias_ctrl)
998 afi_writel(pcie, 0, AFI_PEXBIAS_CTRL_0);
1000 /* configure mode and disable all ports */
1001 value = afi_readl(pcie, AFI_PCIE_CONFIG);
1002 value &= ~AFI_PCIE_CONFIG_SM2TMS0_XBAR_CONFIG_MASK;
1003 value |= AFI_PCIE_CONFIG_PCIE_DISABLE_ALL | pcie->xbar_config;
1005 list_for_each_entry(port, &pcie->ports, list)
1006 value &= ~AFI_PCIE_CONFIG_PCIE_DISABLE(port->index);
1008 afi_writel(pcie, value, AFI_PCIE_CONFIG);
1010 if (soc->has_gen2) {
1011 value = afi_readl(pcie, AFI_FUSE);
1012 value &= ~AFI_FUSE_PCIE_T0_GEN2_DIS;
1013 afi_writel(pcie, value, AFI_FUSE);
1015 value = afi_readl(pcie, AFI_FUSE);
1016 value |= AFI_FUSE_PCIE_T0_GEN2_DIS;
1017 afi_writel(pcie, value, AFI_FUSE);
1020 err = tegra_pcie_phy_power_on(pcie);
1022 dev_err(dev, "failed to power on PHY(s): %d\n", err);
1026 /* take the PCIe interface module out of reset */
1027 reset_control_deassert(pcie->pcie_xrst);
1029 /* finally enable PCIe */
1030 value = afi_readl(pcie, AFI_CONFIGURATION);
1031 value |= AFI_CONFIGURATION_EN_FPCI;
1032 afi_writel(pcie, value, AFI_CONFIGURATION);
1034 value = AFI_INTR_EN_INI_SLVERR | AFI_INTR_EN_INI_DECERR |
1035 AFI_INTR_EN_TGT_SLVERR | AFI_INTR_EN_TGT_DECERR |
1036 AFI_INTR_EN_TGT_WRERR | AFI_INTR_EN_DFPCI_DECERR;
1038 if (soc->has_intr_prsnt_sense)
1039 value |= AFI_INTR_EN_PRSNT_SENSE;
1041 afi_writel(pcie, value, AFI_AFI_INTR_ENABLE);
1042 afi_writel(pcie, 0xffffffff, AFI_SM_INTR_ENABLE);
1044 /* don't enable MSI for now, only when needed */
1045 afi_writel(pcie, AFI_INTR_MASK_INT_MASK, AFI_INTR_MASK);
1047 /* disable all exceptions */
1048 afi_writel(pcie, 0, AFI_FPCI_ERROR_MASKS);
1053 static void tegra_pcie_power_off(struct tegra_pcie *pcie)
1055 struct device *dev = pcie->dev;
1058 /* TODO: disable and unprepare clocks? */
1060 err = tegra_pcie_phy_power_off(pcie);
1062 dev_err(dev, "failed to power off PHY(s): %d\n", err);
1064 reset_control_assert(pcie->pcie_xrst);
1065 reset_control_assert(pcie->afi_rst);
1066 reset_control_assert(pcie->pex_rst);
1068 tegra_powergate_power_off(TEGRA_POWERGATE_PCIE);
1070 err = regulator_bulk_disable(pcie->num_supplies, pcie->supplies);
1072 dev_warn(dev, "failed to disable regulators: %d\n", err);
1075 static int tegra_pcie_power_on(struct tegra_pcie *pcie)
1077 struct device *dev = pcie->dev;
1078 const struct tegra_pcie_soc *soc = pcie->soc;
1081 reset_control_assert(pcie->pcie_xrst);
1082 reset_control_assert(pcie->afi_rst);
1083 reset_control_assert(pcie->pex_rst);
1085 tegra_powergate_power_off(TEGRA_POWERGATE_PCIE);
1087 /* enable regulators */
1088 err = regulator_bulk_enable(pcie->num_supplies, pcie->supplies);
1090 dev_err(dev, "failed to enable regulators: %d\n", err);
1092 err = tegra_powergate_sequence_power_up(TEGRA_POWERGATE_PCIE,
1096 dev_err(dev, "powerup sequence failed: %d\n", err);
1100 reset_control_deassert(pcie->afi_rst);
1102 err = clk_prepare_enable(pcie->afi_clk);
1104 dev_err(dev, "failed to enable AFI clock: %d\n", err);
1108 if (soc->has_cml_clk) {
1109 err = clk_prepare_enable(pcie->cml_clk);
1111 dev_err(dev, "failed to enable CML clock: %d\n", err);
1116 err = clk_prepare_enable(pcie->pll_e);
1118 dev_err(dev, "failed to enable PLLE clock: %d\n", err);
1125 static int tegra_pcie_clocks_get(struct tegra_pcie *pcie)
1127 struct device *dev = pcie->dev;
1128 const struct tegra_pcie_soc *soc = pcie->soc;
1130 pcie->pex_clk = devm_clk_get(dev, "pex");
1131 if (IS_ERR(pcie->pex_clk))
1132 return PTR_ERR(pcie->pex_clk);
1134 pcie->afi_clk = devm_clk_get(dev, "afi");
1135 if (IS_ERR(pcie->afi_clk))
1136 return PTR_ERR(pcie->afi_clk);
1138 pcie->pll_e = devm_clk_get(dev, "pll_e");
1139 if (IS_ERR(pcie->pll_e))
1140 return PTR_ERR(pcie->pll_e);
1142 if (soc->has_cml_clk) {
1143 pcie->cml_clk = devm_clk_get(dev, "cml");
1144 if (IS_ERR(pcie->cml_clk))
1145 return PTR_ERR(pcie->cml_clk);
1151 static int tegra_pcie_resets_get(struct tegra_pcie *pcie)
1153 struct device *dev = pcie->dev;
1155 pcie->pex_rst = devm_reset_control_get(dev, "pex");
1156 if (IS_ERR(pcie->pex_rst))
1157 return PTR_ERR(pcie->pex_rst);
1159 pcie->afi_rst = devm_reset_control_get(dev, "afi");
1160 if (IS_ERR(pcie->afi_rst))
1161 return PTR_ERR(pcie->afi_rst);
1163 pcie->pcie_xrst = devm_reset_control_get(dev, "pcie_x");
1164 if (IS_ERR(pcie->pcie_xrst))
1165 return PTR_ERR(pcie->pcie_xrst);
1170 static int tegra_pcie_phys_get_legacy(struct tegra_pcie *pcie)
1172 struct device *dev = pcie->dev;
1175 pcie->phy = devm_phy_optional_get(dev, "pcie");
1176 if (IS_ERR(pcie->phy)) {
1177 err = PTR_ERR(pcie->phy);
1178 dev_err(dev, "failed to get PHY: %d\n", err);
1182 err = phy_init(pcie->phy);
1184 dev_err(dev, "failed to initialize PHY: %d\n", err);
1188 pcie->legacy_phy = true;
1193 static struct phy *devm_of_phy_optional_get_index(struct device *dev,
1194 struct device_node *np,
1195 const char *consumer,
1201 name = kasprintf(GFP_KERNEL, "%s-%u", consumer, index);
1203 return ERR_PTR(-ENOMEM);
1205 phy = devm_of_phy_get(dev, np, name);
1208 if (IS_ERR(phy) && PTR_ERR(phy) == -ENODEV)
1214 static int tegra_pcie_port_get_phys(struct tegra_pcie_port *port)
1216 struct device *dev = port->pcie->dev;
1221 port->phys = devm_kcalloc(dev, sizeof(phy), port->lanes, GFP_KERNEL);
1225 for (i = 0; i < port->lanes; i++) {
1226 phy = devm_of_phy_optional_get_index(dev, port->np, "pcie", i);
1228 dev_err(dev, "failed to get PHY#%u: %ld\n", i,
1230 return PTR_ERR(phy);
1233 err = phy_init(phy);
1235 dev_err(dev, "failed to initialize PHY#%u: %d\n", i,
1240 port->phys[i] = phy;
1246 static int tegra_pcie_phys_get(struct tegra_pcie *pcie)
1248 const struct tegra_pcie_soc *soc = pcie->soc;
1249 struct device_node *np = pcie->dev->of_node;
1250 struct tegra_pcie_port *port;
1253 if (!soc->has_gen2 || of_find_property(np, "phys", NULL) != NULL)
1254 return tegra_pcie_phys_get_legacy(pcie);
1256 list_for_each_entry(port, &pcie->ports, list) {
1257 err = tegra_pcie_port_get_phys(port);
1265 static int tegra_pcie_get_resources(struct tegra_pcie *pcie)
1267 struct device *dev = pcie->dev;
1268 struct platform_device *pdev = to_platform_device(dev);
1269 struct resource *pads, *afi, *res;
1272 err = tegra_pcie_clocks_get(pcie);
1274 dev_err(dev, "failed to get clocks: %d\n", err);
1278 err = tegra_pcie_resets_get(pcie);
1280 dev_err(dev, "failed to get resets: %d\n", err);
1284 err = tegra_pcie_phys_get(pcie);
1286 dev_err(dev, "failed to get PHYs: %d\n", err);
1290 err = tegra_pcie_power_on(pcie);
1292 dev_err(dev, "failed to power up: %d\n", err);
1296 pads = platform_get_resource_byname(pdev, IORESOURCE_MEM, "pads");
1297 pcie->pads = devm_ioremap_resource(dev, pads);
1298 if (IS_ERR(pcie->pads)) {
1299 err = PTR_ERR(pcie->pads);
1303 afi = platform_get_resource_byname(pdev, IORESOURCE_MEM, "afi");
1304 pcie->afi = devm_ioremap_resource(dev, afi);
1305 if (IS_ERR(pcie->afi)) {
1306 err = PTR_ERR(pcie->afi);
1310 /* request configuration space, but remap later, on demand */
1311 res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "cs");
1313 err = -EADDRNOTAVAIL;
1317 pcie->cs = devm_request_mem_region(dev, res->start,
1318 resource_size(res), res->name);
1320 err = -EADDRNOTAVAIL;
1324 /* request interrupt */
1325 err = platform_get_irq_byname(pdev, "intr");
1327 dev_err(dev, "failed to get IRQ: %d\n", err);
1333 err = request_irq(pcie->irq, tegra_pcie_isr, IRQF_SHARED, "PCIE", pcie);
1335 dev_err(dev, "failed to register IRQ: %d\n", err);
1342 tegra_pcie_power_off(pcie);
1346 static int tegra_pcie_put_resources(struct tegra_pcie *pcie)
1348 struct device *dev = pcie->dev;
1352 free_irq(pcie->irq, pcie);
1354 tegra_pcie_power_off(pcie);
1356 err = phy_exit(pcie->phy);
1358 dev_err(dev, "failed to teardown PHY: %d\n", err);
1363 static int tegra_msi_alloc(struct tegra_msi *chip)
1367 mutex_lock(&chip->lock);
1369 msi = find_first_zero_bit(chip->used, INT_PCI_MSI_NR);
1370 if (msi < INT_PCI_MSI_NR)
1371 set_bit(msi, chip->used);
1375 mutex_unlock(&chip->lock);
1380 static void tegra_msi_free(struct tegra_msi *chip, unsigned long irq)
1382 struct device *dev = chip->chip.dev;
1384 mutex_lock(&chip->lock);
1386 if (!test_bit(irq, chip->used))
1387 dev_err(dev, "trying to free unused MSI#%lu\n", irq);
1389 clear_bit(irq, chip->used);
1391 mutex_unlock(&chip->lock);
1394 static irqreturn_t tegra_pcie_msi_irq(int irq, void *data)
1396 struct tegra_pcie *pcie = data;
1397 struct device *dev = pcie->dev;
1398 struct tegra_msi *msi = &pcie->msi;
1399 unsigned int i, processed = 0;
1401 for (i = 0; i < 8; i++) {
1402 unsigned long reg = afi_readl(pcie, AFI_MSI_VEC0 + i * 4);
1405 unsigned int offset = find_first_bit(®, 32);
1406 unsigned int index = i * 32 + offset;
1409 /* clear the interrupt */
1410 afi_writel(pcie, 1 << offset, AFI_MSI_VEC0 + i * 4);
1412 irq = irq_find_mapping(msi->domain, index);
1414 if (test_bit(index, msi->used))
1415 generic_handle_irq(irq);
1417 dev_info(dev, "unhandled MSI\n");
1420 * that's weird who triggered this?
1423 dev_info(dev, "unexpected MSI\n");
1426 /* see if there's any more pending in this vector */
1427 reg = afi_readl(pcie, AFI_MSI_VEC0 + i * 4);
1433 return processed > 0 ? IRQ_HANDLED : IRQ_NONE;
1436 static int tegra_msi_setup_irq(struct msi_controller *chip,
1437 struct pci_dev *pdev, struct msi_desc *desc)
1439 struct tegra_msi *msi = to_tegra_msi(chip);
1444 hwirq = tegra_msi_alloc(msi);
1448 irq = irq_create_mapping(msi->domain, hwirq);
1450 tegra_msi_free(msi, hwirq);
1454 irq_set_msi_desc(irq, desc);
1456 msg.address_lo = virt_to_phys((void *)msi->pages);
1457 /* 32 bit address only */
1461 pci_write_msi_msg(irq, &msg);
1466 static void tegra_msi_teardown_irq(struct msi_controller *chip,
1469 struct tegra_msi *msi = to_tegra_msi(chip);
1470 struct irq_data *d = irq_get_irq_data(irq);
1471 irq_hw_number_t hwirq = irqd_to_hwirq(d);
1473 irq_dispose_mapping(irq);
1474 tegra_msi_free(msi, hwirq);
1477 static struct irq_chip tegra_msi_irq_chip = {
1478 .name = "Tegra PCIe MSI",
1479 .irq_enable = pci_msi_unmask_irq,
1480 .irq_disable = pci_msi_mask_irq,
1481 .irq_mask = pci_msi_mask_irq,
1482 .irq_unmask = pci_msi_unmask_irq,
1485 static int tegra_msi_map(struct irq_domain *domain, unsigned int irq,
1486 irq_hw_number_t hwirq)
1488 irq_set_chip_and_handler(irq, &tegra_msi_irq_chip, handle_simple_irq);
1489 irq_set_chip_data(irq, domain->host_data);
1491 tegra_cpuidle_pcie_irqs_in_use();
1496 static const struct irq_domain_ops msi_domain_ops = {
1497 .map = tegra_msi_map,
1500 static int tegra_pcie_enable_msi(struct tegra_pcie *pcie)
1502 struct pci_host_bridge *host = pci_host_bridge_from_priv(pcie);
1503 struct platform_device *pdev = to_platform_device(pcie->dev);
1504 const struct tegra_pcie_soc *soc = pcie->soc;
1505 struct tegra_msi *msi = &pcie->msi;
1506 struct device *dev = pcie->dev;
1511 mutex_init(&msi->lock);
1513 msi->chip.dev = dev;
1514 msi->chip.setup_irq = tegra_msi_setup_irq;
1515 msi->chip.teardown_irq = tegra_msi_teardown_irq;
1517 msi->domain = irq_domain_add_linear(dev->of_node, INT_PCI_MSI_NR,
1518 &msi_domain_ops, &msi->chip);
1520 dev_err(dev, "failed to create IRQ domain\n");
1524 err = platform_get_irq_byname(pdev, "msi");
1526 dev_err(dev, "failed to get IRQ: %d\n", err);
1532 err = request_irq(msi->irq, tegra_pcie_msi_irq, IRQF_NO_THREAD,
1533 tegra_msi_irq_chip.name, pcie);
1535 dev_err(dev, "failed to request IRQ: %d\n", err);
1539 /* setup AFI/FPCI range */
1540 msi->pages = __get_free_pages(GFP_KERNEL, 0);
1541 base = virt_to_phys((void *)msi->pages);
1543 afi_writel(pcie, base >> soc->msi_base_shift, AFI_MSI_FPCI_BAR_ST);
1544 afi_writel(pcie, base, AFI_MSI_AXI_BAR_ST);
1545 /* this register is in 4K increments */
1546 afi_writel(pcie, 1, AFI_MSI_BAR_SZ);
1548 /* enable all MSI vectors */
1549 afi_writel(pcie, 0xffffffff, AFI_MSI_EN_VEC0);
1550 afi_writel(pcie, 0xffffffff, AFI_MSI_EN_VEC1);
1551 afi_writel(pcie, 0xffffffff, AFI_MSI_EN_VEC2);
1552 afi_writel(pcie, 0xffffffff, AFI_MSI_EN_VEC3);
1553 afi_writel(pcie, 0xffffffff, AFI_MSI_EN_VEC4);
1554 afi_writel(pcie, 0xffffffff, AFI_MSI_EN_VEC5);
1555 afi_writel(pcie, 0xffffffff, AFI_MSI_EN_VEC6);
1556 afi_writel(pcie, 0xffffffff, AFI_MSI_EN_VEC7);
1558 /* and unmask the MSI interrupt */
1559 reg = afi_readl(pcie, AFI_INTR_MASK);
1560 reg |= AFI_INTR_MASK_MSI_MASK;
1561 afi_writel(pcie, reg, AFI_INTR_MASK);
1563 host->msi = &msi->chip;
1568 irq_domain_remove(msi->domain);
1572 static int tegra_pcie_disable_msi(struct tegra_pcie *pcie)
1574 struct tegra_msi *msi = &pcie->msi;
1575 unsigned int i, irq;
1578 /* mask the MSI interrupt */
1579 value = afi_readl(pcie, AFI_INTR_MASK);
1580 value &= ~AFI_INTR_MASK_MSI_MASK;
1581 afi_writel(pcie, value, AFI_INTR_MASK);
1583 /* disable all MSI vectors */
1584 afi_writel(pcie, 0, AFI_MSI_EN_VEC0);
1585 afi_writel(pcie, 0, AFI_MSI_EN_VEC1);
1586 afi_writel(pcie, 0, AFI_MSI_EN_VEC2);
1587 afi_writel(pcie, 0, AFI_MSI_EN_VEC3);
1588 afi_writel(pcie, 0, AFI_MSI_EN_VEC4);
1589 afi_writel(pcie, 0, AFI_MSI_EN_VEC5);
1590 afi_writel(pcie, 0, AFI_MSI_EN_VEC6);
1591 afi_writel(pcie, 0, AFI_MSI_EN_VEC7);
1593 free_pages(msi->pages, 0);
1596 free_irq(msi->irq, pcie);
1598 for (i = 0; i < INT_PCI_MSI_NR; i++) {
1599 irq = irq_find_mapping(msi->domain, i);
1601 irq_dispose_mapping(irq);
1604 irq_domain_remove(msi->domain);
1609 static int tegra_pcie_get_xbar_config(struct tegra_pcie *pcie, u32 lanes,
1612 struct device *dev = pcie->dev;
1613 struct device_node *np = dev->of_node;
1615 if (of_device_is_compatible(np, "nvidia,tegra124-pcie")) {
1618 dev_info(dev, "4x1, 1x1 configuration\n");
1619 *xbar = AFI_PCIE_CONFIG_SM2TMS0_XBAR_CONFIG_X4_X1;
1623 dev_info(dev, "2x1, 1x1 configuration\n");
1624 *xbar = AFI_PCIE_CONFIG_SM2TMS0_XBAR_CONFIG_X2_X1;
1627 } else if (of_device_is_compatible(np, "nvidia,tegra30-pcie")) {
1630 dev_info(dev, "4x1, 2x1 configuration\n");
1631 *xbar = AFI_PCIE_CONFIG_SM2TMS0_XBAR_CONFIG_420;
1635 dev_info(dev, "2x3 configuration\n");
1636 *xbar = AFI_PCIE_CONFIG_SM2TMS0_XBAR_CONFIG_222;
1640 dev_info(dev, "4x1, 1x2 configuration\n");
1641 *xbar = AFI_PCIE_CONFIG_SM2TMS0_XBAR_CONFIG_411;
1644 } else if (of_device_is_compatible(np, "nvidia,tegra20-pcie")) {
1647 dev_info(dev, "single-mode configuration\n");
1648 *xbar = AFI_PCIE_CONFIG_SM2TMS0_XBAR_CONFIG_SINGLE;
1652 dev_info(dev, "dual-mode configuration\n");
1653 *xbar = AFI_PCIE_CONFIG_SM2TMS0_XBAR_CONFIG_DUAL;
1662 * Check whether a given set of supplies is available in a device tree node.
1663 * This is used to check whether the new or the legacy device tree bindings
1666 static bool of_regulator_bulk_available(struct device_node *np,
1667 struct regulator_bulk_data *supplies,
1668 unsigned int num_supplies)
1673 for (i = 0; i < num_supplies; i++) {
1674 snprintf(property, 32, "%s-supply", supplies[i].supply);
1676 if (of_find_property(np, property, NULL) == NULL)
1684 * Old versions of the device tree binding for this device used a set of power
1685 * supplies that didn't match the hardware inputs. This happened to work for a
1686 * number of cases but is not future proof. However to preserve backwards-
1687 * compatibility with old device trees, this function will try to use the old
1690 static int tegra_pcie_get_legacy_regulators(struct tegra_pcie *pcie)
1692 struct device *dev = pcie->dev;
1693 struct device_node *np = dev->of_node;
1695 if (of_device_is_compatible(np, "nvidia,tegra30-pcie"))
1696 pcie->num_supplies = 3;
1697 else if (of_device_is_compatible(np, "nvidia,tegra20-pcie"))
1698 pcie->num_supplies = 2;
1700 if (pcie->num_supplies == 0) {
1701 dev_err(dev, "device %s not supported in legacy mode\n",
1706 pcie->supplies = devm_kcalloc(dev, pcie->num_supplies,
1707 sizeof(*pcie->supplies),
1709 if (!pcie->supplies)
1712 pcie->supplies[0].supply = "pex-clk";
1713 pcie->supplies[1].supply = "vdd";
1715 if (pcie->num_supplies > 2)
1716 pcie->supplies[2].supply = "avdd";
1718 return devm_regulator_bulk_get(dev, pcie->num_supplies, pcie->supplies);
1722 * Obtains the list of regulators required for a particular generation of the
1725 * This would've been nice to do simply by providing static tables for use
1726 * with the regulator_bulk_*() API, but unfortunately Tegra30 is a bit quirky
1727 * in that it has two pairs or AVDD_PEX and VDD_PEX supplies (PEXA and PEXB)
1728 * and either seems to be optional depending on which ports are being used.
1730 static int tegra_pcie_get_regulators(struct tegra_pcie *pcie, u32 lane_mask)
1732 struct device *dev = pcie->dev;
1733 struct device_node *np = dev->of_node;
1736 if (of_device_is_compatible(np, "nvidia,tegra124-pcie")) {
1737 pcie->num_supplies = 7;
1739 pcie->supplies = devm_kcalloc(dev, pcie->num_supplies,
1740 sizeof(*pcie->supplies),
1742 if (!pcie->supplies)
1745 pcie->supplies[i++].supply = "avddio-pex";
1746 pcie->supplies[i++].supply = "dvddio-pex";
1747 pcie->supplies[i++].supply = "avdd-pex-pll";
1748 pcie->supplies[i++].supply = "hvdd-pex";
1749 pcie->supplies[i++].supply = "hvdd-pex-pll-e";
1750 pcie->supplies[i++].supply = "vddio-pex-ctl";
1751 pcie->supplies[i++].supply = "avdd-pll-erefe";
1752 } else if (of_device_is_compatible(np, "nvidia,tegra30-pcie")) {
1753 bool need_pexa = false, need_pexb = false;
1755 /* VDD_PEXA and AVDD_PEXA supply lanes 0 to 3 */
1756 if (lane_mask & 0x0f)
1759 /* VDD_PEXB and AVDD_PEXB supply lanes 4 to 5 */
1760 if (lane_mask & 0x30)
1763 pcie->num_supplies = 4 + (need_pexa ? 2 : 0) +
1764 (need_pexb ? 2 : 0);
1766 pcie->supplies = devm_kcalloc(dev, pcie->num_supplies,
1767 sizeof(*pcie->supplies),
1769 if (!pcie->supplies)
1772 pcie->supplies[i++].supply = "avdd-pex-pll";
1773 pcie->supplies[i++].supply = "hvdd-pex";
1774 pcie->supplies[i++].supply = "vddio-pex-ctl";
1775 pcie->supplies[i++].supply = "avdd-plle";
1778 pcie->supplies[i++].supply = "avdd-pexa";
1779 pcie->supplies[i++].supply = "vdd-pexa";
1783 pcie->supplies[i++].supply = "avdd-pexb";
1784 pcie->supplies[i++].supply = "vdd-pexb";
1786 } else if (of_device_is_compatible(np, "nvidia,tegra20-pcie")) {
1787 pcie->num_supplies = 5;
1789 pcie->supplies = devm_kcalloc(dev, pcie->num_supplies,
1790 sizeof(*pcie->supplies),
1792 if (!pcie->supplies)
1795 pcie->supplies[0].supply = "avdd-pex";
1796 pcie->supplies[1].supply = "vdd-pex";
1797 pcie->supplies[2].supply = "avdd-pex-pll";
1798 pcie->supplies[3].supply = "avdd-plle";
1799 pcie->supplies[4].supply = "vddio-pex-clk";
1802 if (of_regulator_bulk_available(dev->of_node, pcie->supplies,
1803 pcie->num_supplies))
1804 return devm_regulator_bulk_get(dev, pcie->num_supplies,
1808 * If not all regulators are available for this new scheme, assume
1809 * that the device tree complies with an older version of the device
1812 dev_info(dev, "using legacy DT binding for power supplies\n");
1814 devm_kfree(dev, pcie->supplies);
1815 pcie->num_supplies = 0;
1817 return tegra_pcie_get_legacy_regulators(pcie);
1820 static int tegra_pcie_parse_dt(struct tegra_pcie *pcie)
1822 struct device *dev = pcie->dev;
1823 struct device_node *np = dev->of_node, *port;
1824 const struct tegra_pcie_soc *soc = pcie->soc;
1825 struct of_pci_range_parser parser;
1826 struct of_pci_range range;
1827 u32 lanes = 0, mask = 0;
1828 unsigned int lane = 0;
1829 struct resource res;
1832 if (of_pci_range_parser_init(&parser, np)) {
1833 dev_err(dev, "missing \"ranges\" property\n");
1837 for_each_of_pci_range(&parser, &range) {
1838 err = of_pci_range_to_resource(&range, np, &res);
1842 switch (res.flags & IORESOURCE_TYPE_BITS) {
1844 /* Track the bus -> CPU I/O mapping offset. */
1845 pcie->offset.io = res.start - range.pci_addr;
1847 memcpy(&pcie->pio, &res, sizeof(res));
1848 pcie->pio.name = np->full_name;
1851 * The Tegra PCIe host bridge uses this to program the
1852 * mapping of the I/O space to the physical address,
1853 * so we override the .start and .end fields here that
1854 * of_pci_range_to_resource() converted to I/O space.
1855 * We also set the IORESOURCE_MEM type to clarify that
1856 * the resource is in the physical memory space.
1858 pcie->io.start = range.cpu_addr;
1859 pcie->io.end = range.cpu_addr + range.size - 1;
1860 pcie->io.flags = IORESOURCE_MEM;
1861 pcie->io.name = "I/O";
1863 memcpy(&res, &pcie->io, sizeof(res));
1866 case IORESOURCE_MEM:
1868 * Track the bus -> CPU memory mapping offset. This
1869 * assumes that the prefetchable and non-prefetchable
1870 * regions will be the last of type IORESOURCE_MEM in
1871 * the ranges property.
1873 pcie->offset.mem = res.start - range.pci_addr;
1875 if (res.flags & IORESOURCE_PREFETCH) {
1876 memcpy(&pcie->prefetch, &res, sizeof(res));
1877 pcie->prefetch.name = "prefetchable";
1879 memcpy(&pcie->mem, &res, sizeof(res));
1880 pcie->mem.name = "non-prefetchable";
1886 err = of_pci_parse_bus_range(np, &pcie->busn);
1888 dev_err(dev, "failed to parse ranges property: %d\n", err);
1889 pcie->busn.name = np->name;
1890 pcie->busn.start = 0;
1891 pcie->busn.end = 0xff;
1892 pcie->busn.flags = IORESOURCE_BUS;
1895 /* parse root ports */
1896 for_each_child_of_node(np, port) {
1897 struct tegra_pcie_port *rp;
1901 err = of_pci_get_devfn(port);
1903 dev_err(dev, "failed to parse address: %d\n", err);
1907 index = PCI_SLOT(err);
1909 if (index < 1 || index > soc->num_ports) {
1910 dev_err(dev, "invalid port number: %d\n", index);
1916 err = of_property_read_u32(port, "nvidia,num-lanes", &value);
1918 dev_err(dev, "failed to parse # of lanes: %d\n",
1924 dev_err(dev, "invalid # of lanes: %u\n", value);
1928 lanes |= value << (index << 3);
1930 if (!of_device_is_available(port)) {
1935 mask |= ((1 << value) - 1) << lane;
1938 rp = devm_kzalloc(dev, sizeof(*rp), GFP_KERNEL);
1942 err = of_address_to_resource(port, 0, &rp->regs);
1944 dev_err(dev, "failed to parse address: %d\n", err);
1948 INIT_LIST_HEAD(&rp->list);
1954 rp->base = devm_ioremap_resource(dev, &rp->regs);
1955 if (IS_ERR(rp->base))
1956 return PTR_ERR(rp->base);
1958 list_add_tail(&rp->list, &pcie->ports);
1961 err = tegra_pcie_get_xbar_config(pcie, lanes, &pcie->xbar_config);
1963 dev_err(dev, "invalid lane configuration\n");
1967 err = tegra_pcie_get_regulators(pcie, mask);
1975 * FIXME: If there are no PCIe cards attached, then calling this function
1976 * can result in the increase of the bootup time as there are big timeout
1979 #define TEGRA_PCIE_LINKUP_TIMEOUT 200 /* up to 1.2 seconds */
1980 static bool tegra_pcie_port_check_link(struct tegra_pcie_port *port)
1982 struct device *dev = port->pcie->dev;
1983 unsigned int retries = 3;
1984 unsigned long value;
1986 /* override presence detection */
1987 value = readl(port->base + RP_PRIV_MISC);
1988 value &= ~RP_PRIV_MISC_PRSNT_MAP_EP_ABSNT;
1989 value |= RP_PRIV_MISC_PRSNT_MAP_EP_PRSNT;
1990 writel(value, port->base + RP_PRIV_MISC);
1993 unsigned int timeout = TEGRA_PCIE_LINKUP_TIMEOUT;
1996 value = readl(port->base + RP_VEND_XP);
1998 if (value & RP_VEND_XP_DL_UP)
2001 usleep_range(1000, 2000);
2002 } while (--timeout);
2005 dev_err(dev, "link %u down, retrying\n", port->index);
2009 timeout = TEGRA_PCIE_LINKUP_TIMEOUT;
2012 value = readl(port->base + RP_LINK_CONTROL_STATUS);
2014 if (value & RP_LINK_CONTROL_STATUS_DL_LINK_ACTIVE)
2017 usleep_range(1000, 2000);
2018 } while (--timeout);
2021 tegra_pcie_port_reset(port);
2022 } while (--retries);
2027 static void tegra_pcie_enable_ports(struct tegra_pcie *pcie)
2029 struct device *dev = pcie->dev;
2030 struct tegra_pcie_port *port, *tmp;
2032 list_for_each_entry_safe(port, tmp, &pcie->ports, list) {
2033 dev_info(dev, "probing port %u, using %u lanes\n",
2034 port->index, port->lanes);
2036 tegra_pcie_port_enable(port);
2038 if (tegra_pcie_port_check_link(port))
2041 dev_info(dev, "link %u down, ignoring\n", port->index);
2043 tegra_pcie_port_disable(port);
2044 tegra_pcie_port_free(port);
2048 static const struct tegra_pcie_soc tegra20_pcie = {
2050 .msi_base_shift = 0,
2051 .pads_pll_ctl = PADS_PLL_CTL_TEGRA20,
2052 .tx_ref_sel = PADS_PLL_CTL_TXCLKREF_DIV10,
2053 .pads_refclk_cfg0 = 0xfa5cfa5c,
2054 .has_pex_clkreq_en = false,
2055 .has_pex_bias_ctrl = false,
2056 .has_intr_prsnt_sense = false,
2057 .has_cml_clk = false,
2059 .force_pca_enable = false,
2062 static const struct tegra_pcie_soc tegra30_pcie = {
2064 .msi_base_shift = 8,
2065 .pads_pll_ctl = PADS_PLL_CTL_TEGRA30,
2066 .tx_ref_sel = PADS_PLL_CTL_TXCLKREF_BUF_EN,
2067 .pads_refclk_cfg0 = 0xfa5cfa5c,
2068 .pads_refclk_cfg1 = 0xfa5cfa5c,
2069 .has_pex_clkreq_en = true,
2070 .has_pex_bias_ctrl = true,
2071 .has_intr_prsnt_sense = true,
2072 .has_cml_clk = true,
2074 .force_pca_enable = false,
2077 static const struct tegra_pcie_soc tegra124_pcie = {
2079 .msi_base_shift = 8,
2080 .pads_pll_ctl = PADS_PLL_CTL_TEGRA30,
2081 .tx_ref_sel = PADS_PLL_CTL_TXCLKREF_BUF_EN,
2082 .pads_refclk_cfg0 = 0x44ac44ac,
2083 .has_pex_clkreq_en = true,
2084 .has_pex_bias_ctrl = true,
2085 .has_intr_prsnt_sense = true,
2086 .has_cml_clk = true,
2088 .force_pca_enable = false,
2091 static const struct of_device_id tegra_pcie_of_match[] = {
2092 { .compatible = "nvidia,tegra124-pcie", .data = &tegra124_pcie },
2093 { .compatible = "nvidia,tegra30-pcie", .data = &tegra30_pcie },
2094 { .compatible = "nvidia,tegra20-pcie", .data = &tegra20_pcie },
2098 static void *tegra_pcie_ports_seq_start(struct seq_file *s, loff_t *pos)
2100 struct tegra_pcie *pcie = s->private;
2102 if (list_empty(&pcie->ports))
2105 seq_printf(s, "Index Status\n");
2107 return seq_list_start(&pcie->ports, *pos);
2110 static void *tegra_pcie_ports_seq_next(struct seq_file *s, void *v, loff_t *pos)
2112 struct tegra_pcie *pcie = s->private;
2114 return seq_list_next(v, &pcie->ports, pos);
2117 static void tegra_pcie_ports_seq_stop(struct seq_file *s, void *v)
2121 static int tegra_pcie_ports_seq_show(struct seq_file *s, void *v)
2123 bool up = false, active = false;
2124 struct tegra_pcie_port *port;
2127 port = list_entry(v, struct tegra_pcie_port, list);
2129 value = readl(port->base + RP_VEND_XP);
2131 if (value & RP_VEND_XP_DL_UP)
2134 value = readl(port->base + RP_LINK_CONTROL_STATUS);
2136 if (value & RP_LINK_CONTROL_STATUS_DL_LINK_ACTIVE)
2139 seq_printf(s, "%2u ", port->index);
2142 seq_printf(s, "up");
2146 seq_printf(s, ", ");
2148 seq_printf(s, "active");
2151 seq_printf(s, "\n");
2155 static const struct seq_operations tegra_pcie_ports_seq_ops = {
2156 .start = tegra_pcie_ports_seq_start,
2157 .next = tegra_pcie_ports_seq_next,
2158 .stop = tegra_pcie_ports_seq_stop,
2159 .show = tegra_pcie_ports_seq_show,
2162 static int tegra_pcie_ports_open(struct inode *inode, struct file *file)
2164 struct tegra_pcie *pcie = inode->i_private;
2168 err = seq_open(file, &tegra_pcie_ports_seq_ops);
2172 s = file->private_data;
2178 static const struct file_operations tegra_pcie_ports_ops = {
2179 .owner = THIS_MODULE,
2180 .open = tegra_pcie_ports_open,
2182 .llseek = seq_lseek,
2183 .release = seq_release,
2186 static int tegra_pcie_debugfs_init(struct tegra_pcie *pcie)
2188 struct dentry *file;
2190 pcie->debugfs = debugfs_create_dir("pcie", NULL);
2194 file = debugfs_create_file("ports", S_IFREG | S_IRUGO, pcie->debugfs,
2195 pcie, &tegra_pcie_ports_ops);
2202 debugfs_remove_recursive(pcie->debugfs);
2203 pcie->debugfs = NULL;
2207 static int tegra_pcie_probe(struct platform_device *pdev)
2209 struct device *dev = &pdev->dev;
2210 struct pci_host_bridge *host;
2211 struct tegra_pcie *pcie;
2212 struct pci_bus *child;
2215 host = pci_alloc_host_bridge(sizeof(*pcie));
2219 pcie = pci_host_bridge_priv(host);
2221 pcie->soc = of_device_get_match_data(dev);
2222 INIT_LIST_HEAD(&pcie->buses);
2223 INIT_LIST_HEAD(&pcie->ports);
2226 err = tegra_pcie_parse_dt(pcie);
2230 err = tegra_pcie_get_resources(pcie);
2232 dev_err(dev, "failed to request resources: %d\n", err);
2236 err = tegra_pcie_enable_controller(pcie);
2240 err = tegra_pcie_request_resources(pcie);
2244 /* setup the AFI address translations */
2245 tegra_pcie_setup_translations(pcie);
2247 if (IS_ENABLED(CONFIG_PCI_MSI)) {
2248 err = tegra_pcie_enable_msi(pcie);
2250 dev_err(dev, "failed to enable MSI support: %d\n", err);
2255 tegra_pcie_enable_ports(pcie);
2257 pci_add_flags(PCI_REASSIGN_ALL_RSRC | PCI_REASSIGN_ALL_BUS);
2258 host->busnr = pcie->busn.start;
2259 host->dev.parent = &pdev->dev;
2260 host->ops = &tegra_pcie_ops;
2262 err = pci_register_host_bridge(host);
2264 dev_err(dev, "failed to register host: %d\n", err);
2268 pci_scan_child_bus(host->bus);
2270 pci_fixup_irqs(pci_common_swizzle, tegra_pcie_map_irq);
2271 pci_bus_size_bridges(host->bus);
2272 pci_bus_assign_resources(host->bus);
2274 list_for_each_entry(child, &host->bus->children, node)
2275 pcie_bus_configure_settings(child);
2277 pci_bus_add_devices(host->bus);
2279 if (IS_ENABLED(CONFIG_DEBUG_FS)) {
2280 err = tegra_pcie_debugfs_init(pcie);
2282 dev_err(dev, "failed to setup debugfs: %d\n", err);
2288 if (IS_ENABLED(CONFIG_PCI_MSI))
2289 tegra_pcie_disable_msi(pcie);
2291 tegra_pcie_put_resources(pcie);
2295 static struct platform_driver tegra_pcie_driver = {
2297 .name = "tegra-pcie",
2298 .of_match_table = tegra_pcie_of_match,
2299 .suppress_bind_attrs = true,
2301 .probe = tegra_pcie_probe,
2303 builtin_platform_driver(tegra_pcie_driver);