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 * This program is free software; you can redistribute it and/or modify
13 * it under the terms of the GNU General Public License as published by
14 * the Free Software Foundation; either version 2 of the License, or
15 * (at your option) any later version.
17 * This program is distributed in the hope that it will be useful, but WITHOUT
18 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
19 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
22 * You should have received a copy of the GNU General Public License along
23 * with this program; if not, write to the Free Software Foundation, Inc.,
24 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
27 #include <linux/clk.h>
28 #include <linux/debugfs.h>
29 #include <linux/delay.h>
30 #include <linux/export.h>
31 #include <linux/interrupt.h>
32 #include <linux/irq.h>
33 #include <linux/irqdomain.h>
34 #include <linux/kernel.h>
35 #include <linux/module.h>
36 #include <linux/msi.h>
37 #include <linux/of_address.h>
38 #include <linux/of_pci.h>
39 #include <linux/of_platform.h>
40 #include <linux/pci.h>
41 #include <linux/phy/phy.h>
42 #include <linux/platform_device.h>
43 #include <linux/reset.h>
44 #include <linux/sizes.h>
45 #include <linux/slab.h>
46 #include <linux/vmalloc.h>
47 #include <linux/regulator/consumer.h>
49 #include <soc/tegra/cpuidle.h>
50 #include <soc/tegra/pmc.h>
52 #include <asm/mach/irq.h>
53 #include <asm/mach/map.h>
54 #include <asm/mach/pci.h>
56 #define INT_PCI_MSI_NR (8 * 32)
58 /* register definitions */
60 #define AFI_AXI_BAR0_SZ 0x00
61 #define AFI_AXI_BAR1_SZ 0x04
62 #define AFI_AXI_BAR2_SZ 0x08
63 #define AFI_AXI_BAR3_SZ 0x0c
64 #define AFI_AXI_BAR4_SZ 0x10
65 #define AFI_AXI_BAR5_SZ 0x14
67 #define AFI_AXI_BAR0_START 0x18
68 #define AFI_AXI_BAR1_START 0x1c
69 #define AFI_AXI_BAR2_START 0x20
70 #define AFI_AXI_BAR3_START 0x24
71 #define AFI_AXI_BAR4_START 0x28
72 #define AFI_AXI_BAR5_START 0x2c
74 #define AFI_FPCI_BAR0 0x30
75 #define AFI_FPCI_BAR1 0x34
76 #define AFI_FPCI_BAR2 0x38
77 #define AFI_FPCI_BAR3 0x3c
78 #define AFI_FPCI_BAR4 0x40
79 #define AFI_FPCI_BAR5 0x44
81 #define AFI_CACHE_BAR0_SZ 0x48
82 #define AFI_CACHE_BAR0_ST 0x4c
83 #define AFI_CACHE_BAR1_SZ 0x50
84 #define AFI_CACHE_BAR1_ST 0x54
86 #define AFI_MSI_BAR_SZ 0x60
87 #define AFI_MSI_FPCI_BAR_ST 0x64
88 #define AFI_MSI_AXI_BAR_ST 0x68
90 #define AFI_MSI_VEC0 0x6c
91 #define AFI_MSI_VEC1 0x70
92 #define AFI_MSI_VEC2 0x74
93 #define AFI_MSI_VEC3 0x78
94 #define AFI_MSI_VEC4 0x7c
95 #define AFI_MSI_VEC5 0x80
96 #define AFI_MSI_VEC6 0x84
97 #define AFI_MSI_VEC7 0x88
99 #define AFI_MSI_EN_VEC0 0x8c
100 #define AFI_MSI_EN_VEC1 0x90
101 #define AFI_MSI_EN_VEC2 0x94
102 #define AFI_MSI_EN_VEC3 0x98
103 #define AFI_MSI_EN_VEC4 0x9c
104 #define AFI_MSI_EN_VEC5 0xa0
105 #define AFI_MSI_EN_VEC6 0xa4
106 #define AFI_MSI_EN_VEC7 0xa8
108 #define AFI_CONFIGURATION 0xac
109 #define AFI_CONFIGURATION_EN_FPCI (1 << 0)
111 #define AFI_FPCI_ERROR_MASKS 0xb0
113 #define AFI_INTR_MASK 0xb4
114 #define AFI_INTR_MASK_INT_MASK (1 << 0)
115 #define AFI_INTR_MASK_MSI_MASK (1 << 8)
117 #define AFI_INTR_CODE 0xb8
118 #define AFI_INTR_CODE_MASK 0xf
119 #define AFI_INTR_INI_SLAVE_ERROR 1
120 #define AFI_INTR_INI_DECODE_ERROR 2
121 #define AFI_INTR_TARGET_ABORT 3
122 #define AFI_INTR_MASTER_ABORT 4
123 #define AFI_INTR_INVALID_WRITE 5
124 #define AFI_INTR_LEGACY 6
125 #define AFI_INTR_FPCI_DECODE_ERROR 7
126 #define AFI_INTR_AXI_DECODE_ERROR 8
127 #define AFI_INTR_FPCI_TIMEOUT 9
128 #define AFI_INTR_PE_PRSNT_SENSE 10
129 #define AFI_INTR_PE_CLKREQ_SENSE 11
130 #define AFI_INTR_CLKCLAMP_SENSE 12
131 #define AFI_INTR_RDY4PD_SENSE 13
132 #define AFI_INTR_P2P_ERROR 14
134 #define AFI_INTR_SIGNATURE 0xbc
135 #define AFI_UPPER_FPCI_ADDRESS 0xc0
136 #define AFI_SM_INTR_ENABLE 0xc4
137 #define AFI_SM_INTR_INTA_ASSERT (1 << 0)
138 #define AFI_SM_INTR_INTB_ASSERT (1 << 1)
139 #define AFI_SM_INTR_INTC_ASSERT (1 << 2)
140 #define AFI_SM_INTR_INTD_ASSERT (1 << 3)
141 #define AFI_SM_INTR_INTA_DEASSERT (1 << 4)
142 #define AFI_SM_INTR_INTB_DEASSERT (1 << 5)
143 #define AFI_SM_INTR_INTC_DEASSERT (1 << 6)
144 #define AFI_SM_INTR_INTD_DEASSERT (1 << 7)
146 #define AFI_AFI_INTR_ENABLE 0xc8
147 #define AFI_INTR_EN_INI_SLVERR (1 << 0)
148 #define AFI_INTR_EN_INI_DECERR (1 << 1)
149 #define AFI_INTR_EN_TGT_SLVERR (1 << 2)
150 #define AFI_INTR_EN_TGT_DECERR (1 << 3)
151 #define AFI_INTR_EN_TGT_WRERR (1 << 4)
152 #define AFI_INTR_EN_DFPCI_DECERR (1 << 5)
153 #define AFI_INTR_EN_AXI_DECERR (1 << 6)
154 #define AFI_INTR_EN_FPCI_TIMEOUT (1 << 7)
155 #define AFI_INTR_EN_PRSNT_SENSE (1 << 8)
157 #define AFI_PCIE_CONFIG 0x0f8
158 #define AFI_PCIE_CONFIG_PCIE_DISABLE(x) (1 << ((x) + 1))
159 #define AFI_PCIE_CONFIG_PCIE_DISABLE_ALL 0xe
160 #define AFI_PCIE_CONFIG_SM2TMS0_XBAR_CONFIG_MASK (0xf << 20)
161 #define AFI_PCIE_CONFIG_SM2TMS0_XBAR_CONFIG_SINGLE (0x0 << 20)
162 #define AFI_PCIE_CONFIG_SM2TMS0_XBAR_CONFIG_420 (0x0 << 20)
163 #define AFI_PCIE_CONFIG_SM2TMS0_XBAR_CONFIG_X2_X1 (0x0 << 20)
164 #define AFI_PCIE_CONFIG_SM2TMS0_XBAR_CONFIG_DUAL (0x1 << 20)
165 #define AFI_PCIE_CONFIG_SM2TMS0_XBAR_CONFIG_222 (0x1 << 20)
166 #define AFI_PCIE_CONFIG_SM2TMS0_XBAR_CONFIG_X4_X1 (0x1 << 20)
167 #define AFI_PCIE_CONFIG_SM2TMS0_XBAR_CONFIG_411 (0x2 << 20)
169 #define AFI_FUSE 0x104
170 #define AFI_FUSE_PCIE_T0_GEN2_DIS (1 << 2)
172 #define AFI_PEX0_CTRL 0x110
173 #define AFI_PEX1_CTRL 0x118
174 #define AFI_PEX2_CTRL 0x128
175 #define AFI_PEX_CTRL_RST (1 << 0)
176 #define AFI_PEX_CTRL_CLKREQ_EN (1 << 1)
177 #define AFI_PEX_CTRL_REFCLK_EN (1 << 3)
178 #define AFI_PEX_CTRL_OVERRIDE_EN (1 << 4)
180 #define AFI_PLLE_CONTROL 0x160
181 #define AFI_PLLE_CONTROL_BYPASS_PADS2PLLE_CONTROL (1 << 9)
182 #define AFI_PLLE_CONTROL_PADS2PLLE_CONTROL_EN (1 << 1)
184 #define AFI_PEXBIAS_CTRL_0 0x168
186 #define RP_VEND_XP 0x00000F00
187 #define RP_VEND_XP_DL_UP (1 << 30)
189 #define RP_PRIV_MISC 0x00000FE0
190 #define RP_PRIV_MISC_PRSNT_MAP_EP_PRSNT (0xE << 0)
191 #define RP_PRIV_MISC_PRSNT_MAP_EP_ABSNT (0xF << 0)
193 #define RP_LINK_CONTROL_STATUS 0x00000090
194 #define RP_LINK_CONTROL_STATUS_DL_LINK_ACTIVE 0x20000000
195 #define RP_LINK_CONTROL_STATUS_LINKSTAT_MASK 0x3fff0000
197 #define PADS_CTL_SEL 0x0000009C
199 #define PADS_CTL 0x000000A0
200 #define PADS_CTL_IDDQ_1L (1 << 0)
201 #define PADS_CTL_TX_DATA_EN_1L (1 << 6)
202 #define PADS_CTL_RX_DATA_EN_1L (1 << 10)
204 #define PADS_PLL_CTL_TEGRA20 0x000000B8
205 #define PADS_PLL_CTL_TEGRA30 0x000000B4
206 #define PADS_PLL_CTL_RST_B4SM (1 << 1)
207 #define PADS_PLL_CTL_LOCKDET (1 << 8)
208 #define PADS_PLL_CTL_REFCLK_MASK (0x3 << 16)
209 #define PADS_PLL_CTL_REFCLK_INTERNAL_CML (0 << 16)
210 #define PADS_PLL_CTL_REFCLK_INTERNAL_CMOS (1 << 16)
211 #define PADS_PLL_CTL_REFCLK_EXTERNAL (2 << 16)
212 #define PADS_PLL_CTL_TXCLKREF_MASK (0x1 << 20)
213 #define PADS_PLL_CTL_TXCLKREF_DIV10 (0 << 20)
214 #define PADS_PLL_CTL_TXCLKREF_DIV5 (1 << 20)
215 #define PADS_PLL_CTL_TXCLKREF_BUF_EN (1 << 22)
217 #define PADS_REFCLK_CFG0 0x000000C8
218 #define PADS_REFCLK_CFG1 0x000000CC
219 #define PADS_REFCLK_BIAS 0x000000D0
222 * Fields in PADS_REFCLK_CFG*. Those registers form an array of 16-bit
223 * entries, one entry per PCIe port. These field definitions and desired
224 * values aren't in the TRM, but do come from NVIDIA.
226 #define PADS_REFCLK_CFG_TERM_SHIFT 2 /* 6:2 */
227 #define PADS_REFCLK_CFG_E_TERM_SHIFT 7
228 #define PADS_REFCLK_CFG_PREDI_SHIFT 8 /* 11:8 */
229 #define PADS_REFCLK_CFG_DRVI_SHIFT 12 /* 15:12 */
231 /* Default value provided by HW engineering is 0xfa5c */
232 #define PADS_REFCLK_CFG_VALUE \
234 (0x17 << PADS_REFCLK_CFG_TERM_SHIFT) | \
235 (0 << PADS_REFCLK_CFG_E_TERM_SHIFT) | \
236 (0xa << PADS_REFCLK_CFG_PREDI_SHIFT) | \
237 (0xf << PADS_REFCLK_CFG_DRVI_SHIFT) \
241 struct msi_chip chip;
242 DECLARE_BITMAP(used, INT_PCI_MSI_NR);
243 struct irq_domain *domain;
249 /* used to differentiate between Tegra SoC generations */
250 struct tegra_pcie_soc_data {
251 unsigned int num_ports;
252 unsigned int msi_base_shift;
255 bool has_pex_clkreq_en;
256 bool has_pex_bias_ctrl;
257 bool has_intr_prsnt_sense;
262 static inline struct tegra_msi *to_tegra_msi(struct msi_chip *chip)
264 return container_of(chip, struct tegra_msi, chip);
274 struct list_head buses;
281 struct resource prefetch;
282 struct resource busn;
289 struct reset_control *pex_rst;
290 struct reset_control *afi_rst;
291 struct reset_control *pcie_xrst;
295 struct tegra_msi msi;
297 struct list_head ports;
298 unsigned int num_ports;
301 struct regulator_bulk_data *supplies;
302 unsigned int num_supplies;
304 const struct tegra_pcie_soc_data *soc_data;
305 struct dentry *debugfs;
308 struct tegra_pcie_port {
309 struct tegra_pcie *pcie;
310 struct list_head list;
311 struct resource regs;
317 struct tegra_pcie_bus {
318 struct vm_struct *area;
319 struct list_head list;
323 static inline struct tegra_pcie *sys_to_pcie(struct pci_sys_data *sys)
325 return sys->private_data;
328 static inline void afi_writel(struct tegra_pcie *pcie, u32 value,
329 unsigned long offset)
331 writel(value, pcie->afi + offset);
334 static inline u32 afi_readl(struct tegra_pcie *pcie, unsigned long offset)
336 return readl(pcie->afi + offset);
339 static inline void pads_writel(struct tegra_pcie *pcie, u32 value,
340 unsigned long offset)
342 writel(value, pcie->pads + offset);
345 static inline u32 pads_readl(struct tegra_pcie *pcie, unsigned long offset)
347 return readl(pcie->pads + offset);
351 * The configuration space mapping on Tegra is somewhat similar to the ECAM
352 * defined by PCIe. However it deviates a bit in how the 4 bits for extended
353 * register accesses are mapped:
355 * [27:24] extended register number
357 * [15:11] device number
358 * [10: 8] function number
359 * [ 7: 0] register number
361 * Mapping the whole extended configuration space would require 256 MiB of
362 * virtual address space, only a small part of which will actually be used.
363 * To work around this, a 1 MiB of virtual addresses are allocated per bus
364 * when the bus is first accessed. When the physical range is mapped, the
365 * the bus number bits are hidden so that the extended register number bits
366 * appear as bits [19:16]. Therefore the virtual mapping looks like this:
368 * [19:16] extended register number
369 * [15:11] device number
370 * [10: 8] function number
371 * [ 7: 0] register number
373 * This is achieved by stitching together 16 chunks of 64 KiB of physical
374 * address space via the MMU.
376 static unsigned long tegra_pcie_conf_offset(unsigned int devfn, int where)
378 return ((where & 0xf00) << 8) | (PCI_SLOT(devfn) << 11) |
379 (PCI_FUNC(devfn) << 8) | (where & 0xfc);
382 static struct tegra_pcie_bus *tegra_pcie_bus_alloc(struct tegra_pcie *pcie,
385 pgprot_t prot = L_PTE_PRESENT | L_PTE_YOUNG | L_PTE_DIRTY | L_PTE_XN |
386 L_PTE_MT_DEV_SHARED | L_PTE_SHARED;
387 phys_addr_t cs = pcie->cs->start;
388 struct tegra_pcie_bus *bus;
392 bus = kzalloc(sizeof(*bus), GFP_KERNEL);
394 return ERR_PTR(-ENOMEM);
396 INIT_LIST_HEAD(&bus->list);
399 /* allocate 1 MiB of virtual addresses */
400 bus->area = get_vm_area(SZ_1M, VM_IOREMAP);
406 /* map each of the 16 chunks of 64 KiB each */
407 for (i = 0; i < 16; i++) {
408 unsigned long virt = (unsigned long)bus->area->addr +
410 phys_addr_t phys = cs + i * SZ_16M + busnr * SZ_64K;
412 err = ioremap_page_range(virt, virt + SZ_64K, phys, prot);
414 dev_err(pcie->dev, "ioremap_page_range() failed: %d\n",
423 vunmap(bus->area->addr);
430 * Look up a virtual address mapping for the specified bus number. If no such
431 * mapping exists, try to create one.
433 static void __iomem *tegra_pcie_bus_map(struct tegra_pcie *pcie,
436 struct tegra_pcie_bus *bus;
438 list_for_each_entry(bus, &pcie->buses, list)
439 if (bus->nr == busnr)
440 return (void __iomem *)bus->area->addr;
442 bus = tegra_pcie_bus_alloc(pcie, busnr);
446 list_add_tail(&bus->list, &pcie->buses);
448 return (void __iomem *)bus->area->addr;
451 static void __iomem *tegra_pcie_conf_address(struct pci_bus *bus,
455 struct tegra_pcie *pcie = sys_to_pcie(bus->sysdata);
456 void __iomem *addr = NULL;
458 if (bus->number == 0) {
459 unsigned int slot = PCI_SLOT(devfn);
460 struct tegra_pcie_port *port;
462 list_for_each_entry(port, &pcie->ports, list) {
463 if (port->index + 1 == slot) {
464 addr = port->base + (where & ~3);
469 addr = tegra_pcie_bus_map(pcie, bus->number);
472 "failed to map cfg. space for bus %u\n",
477 addr += tegra_pcie_conf_offset(devfn, where);
483 static int tegra_pcie_read_conf(struct pci_bus *bus, unsigned int devfn,
484 int where, int size, u32 *value)
488 addr = tegra_pcie_conf_address(bus, devfn, where);
491 return PCIBIOS_DEVICE_NOT_FOUND;
494 *value = readl(addr);
497 *value = (*value >> (8 * (where & 3))) & 0xff;
499 *value = (*value >> (8 * (where & 3))) & 0xffff;
501 return PCIBIOS_SUCCESSFUL;
504 static int tegra_pcie_write_conf(struct pci_bus *bus, unsigned int devfn,
505 int where, int size, u32 value)
510 addr = tegra_pcie_conf_address(bus, devfn, where);
512 return PCIBIOS_DEVICE_NOT_FOUND;
516 return PCIBIOS_SUCCESSFUL;
520 mask = ~(0xffff << ((where & 0x3) * 8));
522 mask = ~(0xff << ((where & 0x3) * 8));
524 return PCIBIOS_BAD_REGISTER_NUMBER;
526 tmp = readl(addr) & mask;
527 tmp |= value << ((where & 0x3) * 8);
530 return PCIBIOS_SUCCESSFUL;
533 static struct pci_ops tegra_pcie_ops = {
534 .read = tegra_pcie_read_conf,
535 .write = tegra_pcie_write_conf,
538 static unsigned long tegra_pcie_port_get_pex_ctrl(struct tegra_pcie_port *port)
540 unsigned long ret = 0;
542 switch (port->index) {
559 static void tegra_pcie_port_reset(struct tegra_pcie_port *port)
561 unsigned long ctrl = tegra_pcie_port_get_pex_ctrl(port);
564 /* pulse reset signal */
565 value = afi_readl(port->pcie, ctrl);
566 value &= ~AFI_PEX_CTRL_RST;
567 afi_writel(port->pcie, value, ctrl);
569 usleep_range(1000, 2000);
571 value = afi_readl(port->pcie, ctrl);
572 value |= AFI_PEX_CTRL_RST;
573 afi_writel(port->pcie, value, ctrl);
576 static void tegra_pcie_port_enable(struct tegra_pcie_port *port)
578 const struct tegra_pcie_soc_data *soc = port->pcie->soc_data;
579 unsigned long ctrl = tegra_pcie_port_get_pex_ctrl(port);
582 /* enable reference clock */
583 value = afi_readl(port->pcie, ctrl);
584 value |= AFI_PEX_CTRL_REFCLK_EN;
586 if (soc->has_pex_clkreq_en)
587 value |= AFI_PEX_CTRL_CLKREQ_EN;
589 value |= AFI_PEX_CTRL_OVERRIDE_EN;
591 afi_writel(port->pcie, value, ctrl);
593 tegra_pcie_port_reset(port);
596 static void tegra_pcie_port_disable(struct tegra_pcie_port *port)
598 const struct tegra_pcie_soc_data *soc = port->pcie->soc_data;
599 unsigned long ctrl = tegra_pcie_port_get_pex_ctrl(port);
602 /* assert port reset */
603 value = afi_readl(port->pcie, ctrl);
604 value &= ~AFI_PEX_CTRL_RST;
605 afi_writel(port->pcie, value, ctrl);
607 /* disable reference clock */
608 value = afi_readl(port->pcie, ctrl);
610 if (soc->has_pex_clkreq_en)
611 value &= ~AFI_PEX_CTRL_CLKREQ_EN;
613 value &= ~AFI_PEX_CTRL_REFCLK_EN;
614 afi_writel(port->pcie, value, ctrl);
617 static void tegra_pcie_port_free(struct tegra_pcie_port *port)
619 struct tegra_pcie *pcie = port->pcie;
621 devm_iounmap(pcie->dev, port->base);
622 devm_release_mem_region(pcie->dev, port->regs.start,
623 resource_size(&port->regs));
624 list_del(&port->list);
625 devm_kfree(pcie->dev, port);
628 static void tegra_pcie_fixup_bridge(struct pci_dev *dev)
632 if ((dev->class >> 16) == PCI_BASE_CLASS_BRIDGE) {
633 pci_read_config_word(dev, PCI_COMMAND, ®);
634 reg |= (PCI_COMMAND_IO | PCI_COMMAND_MEMORY |
635 PCI_COMMAND_MASTER | PCI_COMMAND_SERR);
636 pci_write_config_word(dev, PCI_COMMAND, reg);
639 DECLARE_PCI_FIXUP_FINAL(PCI_ANY_ID, PCI_ANY_ID, tegra_pcie_fixup_bridge);
641 /* Tegra PCIE root complex wrongly reports device class */
642 static void tegra_pcie_fixup_class(struct pci_dev *dev)
644 dev->class = PCI_CLASS_BRIDGE_PCI << 8;
646 DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_NVIDIA, 0x0bf0, tegra_pcie_fixup_class);
647 DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_NVIDIA, 0x0bf1, tegra_pcie_fixup_class);
648 DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_NVIDIA, 0x0e1c, tegra_pcie_fixup_class);
649 DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_NVIDIA, 0x0e1d, tegra_pcie_fixup_class);
651 /* Tegra PCIE requires relaxed ordering */
652 static void tegra_pcie_relax_enable(struct pci_dev *dev)
654 pcie_capability_set_word(dev, PCI_EXP_DEVCTL, PCI_EXP_DEVCTL_RELAX_EN);
656 DECLARE_PCI_FIXUP_FINAL(PCI_ANY_ID, PCI_ANY_ID, tegra_pcie_relax_enable);
658 static int tegra_pcie_setup(int nr, struct pci_sys_data *sys)
660 struct tegra_pcie *pcie = sys_to_pcie(sys);
663 err = devm_request_resource(pcie->dev, &pcie->all, &pcie->mem);
667 err = devm_request_resource(pcie->dev, &pcie->all, &pcie->prefetch);
671 pci_add_resource_offset(&sys->resources, &pcie->mem, sys->mem_offset);
672 pci_add_resource_offset(&sys->resources, &pcie->prefetch,
674 pci_add_resource(&sys->resources, &pcie->busn);
676 pci_ioremap_io(pcie->pio.start, pcie->io.start);
681 static int tegra_pcie_map_irq(const struct pci_dev *pdev, u8 slot, u8 pin)
683 struct tegra_pcie *pcie = sys_to_pcie(pdev->bus->sysdata);
686 tegra_cpuidle_pcie_irqs_in_use();
688 irq = of_irq_parse_and_map_pci(pdev, slot, pin);
695 static void tegra_pcie_add_bus(struct pci_bus *bus)
697 if (IS_ENABLED(CONFIG_PCI_MSI)) {
698 struct tegra_pcie *pcie = sys_to_pcie(bus->sysdata);
700 bus->msi = &pcie->msi.chip;
704 static struct pci_bus *tegra_pcie_scan_bus(int nr, struct pci_sys_data *sys)
706 struct tegra_pcie *pcie = sys_to_pcie(sys);
709 bus = pci_create_root_bus(pcie->dev, sys->busnr, &tegra_pcie_ops, sys,
714 pci_scan_child_bus(bus);
719 static irqreturn_t tegra_pcie_isr(int irq, void *arg)
721 const char *err_msg[] = {
729 "Response decoding error",
730 "AXI response decoding error",
731 "Transaction timeout",
732 "Slot present pin change",
733 "Slot clock request change",
734 "TMS clock ramp change",
735 "TMS ready for power down",
738 struct tegra_pcie *pcie = arg;
741 code = afi_readl(pcie, AFI_INTR_CODE) & AFI_INTR_CODE_MASK;
742 signature = afi_readl(pcie, AFI_INTR_SIGNATURE);
743 afi_writel(pcie, 0, AFI_INTR_CODE);
745 if (code == AFI_INTR_LEGACY)
748 if (code >= ARRAY_SIZE(err_msg))
752 * do not pollute kernel log with master abort reports since they
753 * happen a lot during enumeration
755 if (code == AFI_INTR_MASTER_ABORT)
756 dev_dbg(pcie->dev, "%s, signature: %08x\n", err_msg[code],
759 dev_err(pcie->dev, "%s, signature: %08x\n", err_msg[code],
762 if (code == AFI_INTR_TARGET_ABORT || code == AFI_INTR_MASTER_ABORT ||
763 code == AFI_INTR_FPCI_DECODE_ERROR) {
764 u32 fpci = afi_readl(pcie, AFI_UPPER_FPCI_ADDRESS) & 0xff;
765 u64 address = (u64)fpci << 32 | (signature & 0xfffffffc);
767 if (code == AFI_INTR_MASTER_ABORT)
768 dev_dbg(pcie->dev, " FPCI address: %10llx\n", address);
770 dev_err(pcie->dev, " FPCI address: %10llx\n", address);
777 * FPCI map is as follows:
778 * - 0xfdfc000000: I/O space
779 * - 0xfdfe000000: type 0 configuration space
780 * - 0xfdff000000: type 1 configuration space
781 * - 0xfe00000000: type 0 extended configuration space
782 * - 0xfe10000000: type 1 extended configuration space
784 static void tegra_pcie_setup_translations(struct tegra_pcie *pcie)
786 u32 fpci_bar, size, axi_address;
788 /* Bar 0: type 1 extended configuration space */
789 fpci_bar = 0xfe100000;
790 size = resource_size(pcie->cs);
791 axi_address = pcie->cs->start;
792 afi_writel(pcie, axi_address, AFI_AXI_BAR0_START);
793 afi_writel(pcie, size >> 12, AFI_AXI_BAR0_SZ);
794 afi_writel(pcie, fpci_bar, AFI_FPCI_BAR0);
796 /* Bar 1: downstream IO bar */
797 fpci_bar = 0xfdfc0000;
798 size = resource_size(&pcie->io);
799 axi_address = pcie->io.start;
800 afi_writel(pcie, axi_address, AFI_AXI_BAR1_START);
801 afi_writel(pcie, size >> 12, AFI_AXI_BAR1_SZ);
802 afi_writel(pcie, fpci_bar, AFI_FPCI_BAR1);
804 /* Bar 2: prefetchable memory BAR */
805 fpci_bar = (((pcie->prefetch.start >> 12) & 0x0fffffff) << 4) | 0x1;
806 size = resource_size(&pcie->prefetch);
807 axi_address = pcie->prefetch.start;
808 afi_writel(pcie, axi_address, AFI_AXI_BAR2_START);
809 afi_writel(pcie, size >> 12, AFI_AXI_BAR2_SZ);
810 afi_writel(pcie, fpci_bar, AFI_FPCI_BAR2);
812 /* Bar 3: non prefetchable memory BAR */
813 fpci_bar = (((pcie->mem.start >> 12) & 0x0fffffff) << 4) | 0x1;
814 size = resource_size(&pcie->mem);
815 axi_address = pcie->mem.start;
816 afi_writel(pcie, axi_address, AFI_AXI_BAR3_START);
817 afi_writel(pcie, size >> 12, AFI_AXI_BAR3_SZ);
818 afi_writel(pcie, fpci_bar, AFI_FPCI_BAR3);
820 /* NULL out the remaining BARs as they are not used */
821 afi_writel(pcie, 0, AFI_AXI_BAR4_START);
822 afi_writel(pcie, 0, AFI_AXI_BAR4_SZ);
823 afi_writel(pcie, 0, AFI_FPCI_BAR4);
825 afi_writel(pcie, 0, AFI_AXI_BAR5_START);
826 afi_writel(pcie, 0, AFI_AXI_BAR5_SZ);
827 afi_writel(pcie, 0, AFI_FPCI_BAR5);
829 /* map all upstream transactions as uncached */
830 afi_writel(pcie, PHYS_OFFSET, AFI_CACHE_BAR0_ST);
831 afi_writel(pcie, 0, AFI_CACHE_BAR0_SZ);
832 afi_writel(pcie, 0, AFI_CACHE_BAR1_ST);
833 afi_writel(pcie, 0, AFI_CACHE_BAR1_SZ);
835 /* MSI translations are setup only when needed */
836 afi_writel(pcie, 0, AFI_MSI_FPCI_BAR_ST);
837 afi_writel(pcie, 0, AFI_MSI_BAR_SZ);
838 afi_writel(pcie, 0, AFI_MSI_AXI_BAR_ST);
839 afi_writel(pcie, 0, AFI_MSI_BAR_SZ);
842 static int tegra_pcie_pll_wait(struct tegra_pcie *pcie, unsigned long timeout)
844 const struct tegra_pcie_soc_data *soc = pcie->soc_data;
847 timeout = jiffies + msecs_to_jiffies(timeout);
849 while (time_before(jiffies, timeout)) {
850 value = pads_readl(pcie, soc->pads_pll_ctl);
851 if (value & PADS_PLL_CTL_LOCKDET)
858 static int tegra_pcie_phy_enable(struct tegra_pcie *pcie)
860 const struct tegra_pcie_soc_data *soc = pcie->soc_data;
864 /* initialize internal PHY, enable up to 16 PCIE lanes */
865 pads_writel(pcie, 0x0, PADS_CTL_SEL);
867 /* override IDDQ to 1 on all 4 lanes */
868 value = pads_readl(pcie, PADS_CTL);
869 value |= PADS_CTL_IDDQ_1L;
870 pads_writel(pcie, value, PADS_CTL);
873 * Set up PHY PLL inputs select PLLE output as refclock,
874 * set TX ref sel to div10 (not div5).
876 value = pads_readl(pcie, soc->pads_pll_ctl);
877 value &= ~(PADS_PLL_CTL_REFCLK_MASK | PADS_PLL_CTL_TXCLKREF_MASK);
878 value |= PADS_PLL_CTL_REFCLK_INTERNAL_CML | soc->tx_ref_sel;
879 pads_writel(pcie, value, soc->pads_pll_ctl);
882 value = pads_readl(pcie, soc->pads_pll_ctl);
883 value &= ~PADS_PLL_CTL_RST_B4SM;
884 pads_writel(pcie, value, soc->pads_pll_ctl);
886 usleep_range(20, 100);
888 /* take PLL out of reset */
889 value = pads_readl(pcie, soc->pads_pll_ctl);
890 value |= PADS_PLL_CTL_RST_B4SM;
891 pads_writel(pcie, value, soc->pads_pll_ctl);
893 /* Configure the reference clock driver */
894 value = PADS_REFCLK_CFG_VALUE | (PADS_REFCLK_CFG_VALUE << 16);
895 pads_writel(pcie, value, PADS_REFCLK_CFG0);
896 if (soc->num_ports > 2)
897 pads_writel(pcie, PADS_REFCLK_CFG_VALUE, PADS_REFCLK_CFG1);
899 /* wait for the PLL to lock */
900 err = tegra_pcie_pll_wait(pcie, 500);
902 dev_err(pcie->dev, "PLL failed to lock: %d\n", err);
906 /* turn off IDDQ override */
907 value = pads_readl(pcie, PADS_CTL);
908 value &= ~PADS_CTL_IDDQ_1L;
909 pads_writel(pcie, value, PADS_CTL);
911 /* enable TX/RX data */
912 value = pads_readl(pcie, PADS_CTL);
913 value |= PADS_CTL_TX_DATA_EN_1L | PADS_CTL_RX_DATA_EN_1L;
914 pads_writel(pcie, value, PADS_CTL);
919 static int tegra_pcie_enable_controller(struct tegra_pcie *pcie)
921 const struct tegra_pcie_soc_data *soc = pcie->soc_data;
922 struct tegra_pcie_port *port;
926 /* enable PLL power down */
928 value = afi_readl(pcie, AFI_PLLE_CONTROL);
929 value &= ~AFI_PLLE_CONTROL_BYPASS_PADS2PLLE_CONTROL;
930 value |= AFI_PLLE_CONTROL_PADS2PLLE_CONTROL_EN;
931 afi_writel(pcie, value, AFI_PLLE_CONTROL);
934 /* power down PCIe slot clock bias pad */
935 if (soc->has_pex_bias_ctrl)
936 afi_writel(pcie, 0, AFI_PEXBIAS_CTRL_0);
938 /* configure mode and disable all ports */
939 value = afi_readl(pcie, AFI_PCIE_CONFIG);
940 value &= ~AFI_PCIE_CONFIG_SM2TMS0_XBAR_CONFIG_MASK;
941 value |= AFI_PCIE_CONFIG_PCIE_DISABLE_ALL | pcie->xbar_config;
943 list_for_each_entry(port, &pcie->ports, list)
944 value &= ~AFI_PCIE_CONFIG_PCIE_DISABLE(port->index);
946 afi_writel(pcie, value, AFI_PCIE_CONFIG);
949 value = afi_readl(pcie, AFI_FUSE);
950 value &= ~AFI_FUSE_PCIE_T0_GEN2_DIS;
951 afi_writel(pcie, value, AFI_FUSE);
953 value = afi_readl(pcie, AFI_FUSE);
954 value |= AFI_FUSE_PCIE_T0_GEN2_DIS;
955 afi_writel(pcie, value, AFI_FUSE);
959 err = tegra_pcie_phy_enable(pcie);
961 err = phy_power_on(pcie->phy);
964 dev_err(pcie->dev, "failed to power on PHY: %d\n", err);
968 /* take the PCIe interface module out of reset */
969 reset_control_deassert(pcie->pcie_xrst);
971 /* finally enable PCIe */
972 value = afi_readl(pcie, AFI_CONFIGURATION);
973 value |= AFI_CONFIGURATION_EN_FPCI;
974 afi_writel(pcie, value, AFI_CONFIGURATION);
976 value = AFI_INTR_EN_INI_SLVERR | AFI_INTR_EN_INI_DECERR |
977 AFI_INTR_EN_TGT_SLVERR | AFI_INTR_EN_TGT_DECERR |
978 AFI_INTR_EN_TGT_WRERR | AFI_INTR_EN_DFPCI_DECERR;
980 if (soc->has_intr_prsnt_sense)
981 value |= AFI_INTR_EN_PRSNT_SENSE;
983 afi_writel(pcie, value, AFI_AFI_INTR_ENABLE);
984 afi_writel(pcie, 0xffffffff, AFI_SM_INTR_ENABLE);
986 /* don't enable MSI for now, only when needed */
987 afi_writel(pcie, AFI_INTR_MASK_INT_MASK, AFI_INTR_MASK);
989 /* disable all exceptions */
990 afi_writel(pcie, 0, AFI_FPCI_ERROR_MASKS);
995 static void tegra_pcie_power_off(struct tegra_pcie *pcie)
999 /* TODO: disable and unprepare clocks? */
1001 err = phy_power_off(pcie->phy);
1003 dev_warn(pcie->dev, "failed to power off PHY: %d\n", err);
1005 reset_control_assert(pcie->pcie_xrst);
1006 reset_control_assert(pcie->afi_rst);
1007 reset_control_assert(pcie->pex_rst);
1009 tegra_powergate_power_off(TEGRA_POWERGATE_PCIE);
1011 err = regulator_bulk_disable(pcie->num_supplies, pcie->supplies);
1013 dev_warn(pcie->dev, "failed to disable regulators: %d\n", err);
1016 static int tegra_pcie_power_on(struct tegra_pcie *pcie)
1018 const struct tegra_pcie_soc_data *soc = pcie->soc_data;
1021 reset_control_assert(pcie->pcie_xrst);
1022 reset_control_assert(pcie->afi_rst);
1023 reset_control_assert(pcie->pex_rst);
1025 tegra_powergate_power_off(TEGRA_POWERGATE_PCIE);
1027 /* enable regulators */
1028 err = regulator_bulk_enable(pcie->num_supplies, pcie->supplies);
1030 dev_err(pcie->dev, "failed to enable regulators: %d\n", err);
1032 err = tegra_powergate_sequence_power_up(TEGRA_POWERGATE_PCIE,
1036 dev_err(pcie->dev, "powerup sequence failed: %d\n", err);
1040 reset_control_deassert(pcie->afi_rst);
1042 err = clk_prepare_enable(pcie->afi_clk);
1044 dev_err(pcie->dev, "failed to enable AFI clock: %d\n", err);
1048 if (soc->has_cml_clk) {
1049 err = clk_prepare_enable(pcie->cml_clk);
1051 dev_err(pcie->dev, "failed to enable CML clock: %d\n",
1057 err = clk_prepare_enable(pcie->pll_e);
1059 dev_err(pcie->dev, "failed to enable PLLE clock: %d\n", err);
1066 static int tegra_pcie_clocks_get(struct tegra_pcie *pcie)
1068 const struct tegra_pcie_soc_data *soc = pcie->soc_data;
1070 pcie->pex_clk = devm_clk_get(pcie->dev, "pex");
1071 if (IS_ERR(pcie->pex_clk))
1072 return PTR_ERR(pcie->pex_clk);
1074 pcie->afi_clk = devm_clk_get(pcie->dev, "afi");
1075 if (IS_ERR(pcie->afi_clk))
1076 return PTR_ERR(pcie->afi_clk);
1078 pcie->pll_e = devm_clk_get(pcie->dev, "pll_e");
1079 if (IS_ERR(pcie->pll_e))
1080 return PTR_ERR(pcie->pll_e);
1082 if (soc->has_cml_clk) {
1083 pcie->cml_clk = devm_clk_get(pcie->dev, "cml");
1084 if (IS_ERR(pcie->cml_clk))
1085 return PTR_ERR(pcie->cml_clk);
1091 static int tegra_pcie_resets_get(struct tegra_pcie *pcie)
1093 pcie->pex_rst = devm_reset_control_get(pcie->dev, "pex");
1094 if (IS_ERR(pcie->pex_rst))
1095 return PTR_ERR(pcie->pex_rst);
1097 pcie->afi_rst = devm_reset_control_get(pcie->dev, "afi");
1098 if (IS_ERR(pcie->afi_rst))
1099 return PTR_ERR(pcie->afi_rst);
1101 pcie->pcie_xrst = devm_reset_control_get(pcie->dev, "pcie_x");
1102 if (IS_ERR(pcie->pcie_xrst))
1103 return PTR_ERR(pcie->pcie_xrst);
1108 static int tegra_pcie_get_resources(struct tegra_pcie *pcie)
1110 struct platform_device *pdev = to_platform_device(pcie->dev);
1111 struct resource *pads, *afi, *res;
1114 err = tegra_pcie_clocks_get(pcie);
1116 dev_err(&pdev->dev, "failed to get clocks: %d\n", err);
1120 err = tegra_pcie_resets_get(pcie);
1122 dev_err(&pdev->dev, "failed to get resets: %d\n", err);
1126 pcie->phy = devm_phy_optional_get(pcie->dev, "pcie");
1127 if (IS_ERR(pcie->phy)) {
1128 err = PTR_ERR(pcie->phy);
1129 dev_err(&pdev->dev, "failed to get PHY: %d\n", err);
1133 err = phy_init(pcie->phy);
1135 dev_err(&pdev->dev, "failed to initialize PHY: %d\n", err);
1139 err = tegra_pcie_power_on(pcie);
1141 dev_err(&pdev->dev, "failed to power up: %d\n", err);
1145 pads = platform_get_resource_byname(pdev, IORESOURCE_MEM, "pads");
1146 pcie->pads = devm_ioremap_resource(&pdev->dev, pads);
1147 if (IS_ERR(pcie->pads)) {
1148 err = PTR_ERR(pcie->pads);
1152 afi = platform_get_resource_byname(pdev, IORESOURCE_MEM, "afi");
1153 pcie->afi = devm_ioremap_resource(&pdev->dev, afi);
1154 if (IS_ERR(pcie->afi)) {
1155 err = PTR_ERR(pcie->afi);
1159 /* request configuration space, but remap later, on demand */
1160 res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "cs");
1162 err = -EADDRNOTAVAIL;
1166 pcie->cs = devm_request_mem_region(pcie->dev, res->start,
1167 resource_size(res), res->name);
1169 err = -EADDRNOTAVAIL;
1173 /* request interrupt */
1174 err = platform_get_irq_byname(pdev, "intr");
1176 dev_err(&pdev->dev, "failed to get IRQ: %d\n", err);
1182 err = request_irq(pcie->irq, tegra_pcie_isr, IRQF_SHARED, "PCIE", pcie);
1184 dev_err(&pdev->dev, "failed to register IRQ: %d\n", err);
1191 tegra_pcie_power_off(pcie);
1195 static int tegra_pcie_put_resources(struct tegra_pcie *pcie)
1200 free_irq(pcie->irq, pcie);
1202 tegra_pcie_power_off(pcie);
1204 err = phy_exit(pcie->phy);
1206 dev_err(pcie->dev, "failed to teardown PHY: %d\n", err);
1211 static int tegra_msi_alloc(struct tegra_msi *chip)
1215 mutex_lock(&chip->lock);
1217 msi = find_first_zero_bit(chip->used, INT_PCI_MSI_NR);
1218 if (msi < INT_PCI_MSI_NR)
1219 set_bit(msi, chip->used);
1223 mutex_unlock(&chip->lock);
1228 static void tegra_msi_free(struct tegra_msi *chip, unsigned long irq)
1230 struct device *dev = chip->chip.dev;
1232 mutex_lock(&chip->lock);
1234 if (!test_bit(irq, chip->used))
1235 dev_err(dev, "trying to free unused MSI#%lu\n", irq);
1237 clear_bit(irq, chip->used);
1239 mutex_unlock(&chip->lock);
1242 static irqreturn_t tegra_pcie_msi_irq(int irq, void *data)
1244 struct tegra_pcie *pcie = data;
1245 struct tegra_msi *msi = &pcie->msi;
1246 unsigned int i, processed = 0;
1248 for (i = 0; i < 8; i++) {
1249 unsigned long reg = afi_readl(pcie, AFI_MSI_VEC0 + i * 4);
1252 unsigned int offset = find_first_bit(®, 32);
1253 unsigned int index = i * 32 + offset;
1256 /* clear the interrupt */
1257 afi_writel(pcie, 1 << offset, AFI_MSI_VEC0 + i * 4);
1259 irq = irq_find_mapping(msi->domain, index);
1261 if (test_bit(index, msi->used))
1262 generic_handle_irq(irq);
1264 dev_info(pcie->dev, "unhandled MSI\n");
1267 * that's weird who triggered this?
1270 dev_info(pcie->dev, "unexpected MSI\n");
1273 /* see if there's any more pending in this vector */
1274 reg = afi_readl(pcie, AFI_MSI_VEC0 + i * 4);
1280 return processed > 0 ? IRQ_HANDLED : IRQ_NONE;
1283 static int tegra_msi_setup_irq(struct msi_chip *chip, struct pci_dev *pdev,
1284 struct msi_desc *desc)
1286 struct tegra_msi *msi = to_tegra_msi(chip);
1291 hwirq = tegra_msi_alloc(msi);
1295 irq = irq_create_mapping(msi->domain, hwirq);
1297 tegra_msi_free(msi, hwirq);
1301 irq_set_msi_desc(irq, desc);
1303 msg.address_lo = virt_to_phys((void *)msi->pages);
1304 /* 32 bit address only */
1308 write_msi_msg(irq, &msg);
1313 static void tegra_msi_teardown_irq(struct msi_chip *chip, unsigned int irq)
1315 struct tegra_msi *msi = to_tegra_msi(chip);
1316 struct irq_data *d = irq_get_irq_data(irq);
1317 irq_hw_number_t hwirq = irqd_to_hwirq(d);
1319 irq_dispose_mapping(irq);
1320 tegra_msi_free(msi, hwirq);
1323 static struct irq_chip tegra_msi_irq_chip = {
1324 .name = "Tegra PCIe MSI",
1325 .irq_enable = unmask_msi_irq,
1326 .irq_disable = mask_msi_irq,
1327 .irq_mask = mask_msi_irq,
1328 .irq_unmask = unmask_msi_irq,
1331 static int tegra_msi_map(struct irq_domain *domain, unsigned int irq,
1332 irq_hw_number_t hwirq)
1334 irq_set_chip_and_handler(irq, &tegra_msi_irq_chip, handle_simple_irq);
1335 irq_set_chip_data(irq, domain->host_data);
1336 set_irq_flags(irq, IRQF_VALID);
1338 tegra_cpuidle_pcie_irqs_in_use();
1343 static const struct irq_domain_ops msi_domain_ops = {
1344 .map = tegra_msi_map,
1347 static int tegra_pcie_enable_msi(struct tegra_pcie *pcie)
1349 struct platform_device *pdev = to_platform_device(pcie->dev);
1350 const struct tegra_pcie_soc_data *soc = pcie->soc_data;
1351 struct tegra_msi *msi = &pcie->msi;
1356 mutex_init(&msi->lock);
1358 msi->chip.dev = pcie->dev;
1359 msi->chip.setup_irq = tegra_msi_setup_irq;
1360 msi->chip.teardown_irq = tegra_msi_teardown_irq;
1362 msi->domain = irq_domain_add_linear(pcie->dev->of_node, INT_PCI_MSI_NR,
1363 &msi_domain_ops, &msi->chip);
1365 dev_err(&pdev->dev, "failed to create IRQ domain\n");
1369 err = platform_get_irq_byname(pdev, "msi");
1371 dev_err(&pdev->dev, "failed to get IRQ: %d\n", err);
1377 err = request_irq(msi->irq, tegra_pcie_msi_irq, 0,
1378 tegra_msi_irq_chip.name, pcie);
1380 dev_err(&pdev->dev, "failed to request IRQ: %d\n", err);
1384 /* setup AFI/FPCI range */
1385 msi->pages = __get_free_pages(GFP_KERNEL, 0);
1386 base = virt_to_phys((void *)msi->pages);
1388 afi_writel(pcie, base >> soc->msi_base_shift, AFI_MSI_FPCI_BAR_ST);
1389 afi_writel(pcie, base, AFI_MSI_AXI_BAR_ST);
1390 /* this register is in 4K increments */
1391 afi_writel(pcie, 1, AFI_MSI_BAR_SZ);
1393 /* enable all MSI vectors */
1394 afi_writel(pcie, 0xffffffff, AFI_MSI_EN_VEC0);
1395 afi_writel(pcie, 0xffffffff, AFI_MSI_EN_VEC1);
1396 afi_writel(pcie, 0xffffffff, AFI_MSI_EN_VEC2);
1397 afi_writel(pcie, 0xffffffff, AFI_MSI_EN_VEC3);
1398 afi_writel(pcie, 0xffffffff, AFI_MSI_EN_VEC4);
1399 afi_writel(pcie, 0xffffffff, AFI_MSI_EN_VEC5);
1400 afi_writel(pcie, 0xffffffff, AFI_MSI_EN_VEC6);
1401 afi_writel(pcie, 0xffffffff, AFI_MSI_EN_VEC7);
1403 /* and unmask the MSI interrupt */
1404 reg = afi_readl(pcie, AFI_INTR_MASK);
1405 reg |= AFI_INTR_MASK_MSI_MASK;
1406 afi_writel(pcie, reg, AFI_INTR_MASK);
1411 irq_domain_remove(msi->domain);
1415 static int tegra_pcie_disable_msi(struct tegra_pcie *pcie)
1417 struct tegra_msi *msi = &pcie->msi;
1418 unsigned int i, irq;
1421 /* mask the MSI interrupt */
1422 value = afi_readl(pcie, AFI_INTR_MASK);
1423 value &= ~AFI_INTR_MASK_MSI_MASK;
1424 afi_writel(pcie, value, AFI_INTR_MASK);
1426 /* disable all MSI vectors */
1427 afi_writel(pcie, 0, AFI_MSI_EN_VEC0);
1428 afi_writel(pcie, 0, AFI_MSI_EN_VEC1);
1429 afi_writel(pcie, 0, AFI_MSI_EN_VEC2);
1430 afi_writel(pcie, 0, AFI_MSI_EN_VEC3);
1431 afi_writel(pcie, 0, AFI_MSI_EN_VEC4);
1432 afi_writel(pcie, 0, AFI_MSI_EN_VEC5);
1433 afi_writel(pcie, 0, AFI_MSI_EN_VEC6);
1434 afi_writel(pcie, 0, AFI_MSI_EN_VEC7);
1436 free_pages(msi->pages, 0);
1439 free_irq(msi->irq, pcie);
1441 for (i = 0; i < INT_PCI_MSI_NR; i++) {
1442 irq = irq_find_mapping(msi->domain, i);
1444 irq_dispose_mapping(irq);
1447 irq_domain_remove(msi->domain);
1452 static int tegra_pcie_get_xbar_config(struct tegra_pcie *pcie, u32 lanes,
1455 struct device_node *np = pcie->dev->of_node;
1457 if (of_device_is_compatible(np, "nvidia,tegra124-pcie")) {
1460 dev_info(pcie->dev, "4x1, 1x1 configuration\n");
1461 *xbar = AFI_PCIE_CONFIG_SM2TMS0_XBAR_CONFIG_X4_X1;
1465 dev_info(pcie->dev, "2x1, 1x1 configuration\n");
1466 *xbar = AFI_PCIE_CONFIG_SM2TMS0_XBAR_CONFIG_X2_X1;
1469 } else if (of_device_is_compatible(np, "nvidia,tegra30-pcie")) {
1472 dev_info(pcie->dev, "4x1, 2x1 configuration\n");
1473 *xbar = AFI_PCIE_CONFIG_SM2TMS0_XBAR_CONFIG_420;
1477 dev_info(pcie->dev, "2x3 configuration\n");
1478 *xbar = AFI_PCIE_CONFIG_SM2TMS0_XBAR_CONFIG_222;
1482 dev_info(pcie->dev, "4x1, 1x2 configuration\n");
1483 *xbar = AFI_PCIE_CONFIG_SM2TMS0_XBAR_CONFIG_411;
1486 } else if (of_device_is_compatible(np, "nvidia,tegra20-pcie")) {
1489 dev_info(pcie->dev, "single-mode configuration\n");
1490 *xbar = AFI_PCIE_CONFIG_SM2TMS0_XBAR_CONFIG_SINGLE;
1494 dev_info(pcie->dev, "dual-mode configuration\n");
1495 *xbar = AFI_PCIE_CONFIG_SM2TMS0_XBAR_CONFIG_DUAL;
1504 * Check whether a given set of supplies is available in a device tree node.
1505 * This is used to check whether the new or the legacy device tree bindings
1508 static bool of_regulator_bulk_available(struct device_node *np,
1509 struct regulator_bulk_data *supplies,
1510 unsigned int num_supplies)
1515 for (i = 0; i < num_supplies; i++) {
1516 snprintf(property, 32, "%s-supply", supplies[i].supply);
1518 if (of_find_property(np, property, NULL) == NULL)
1526 * Old versions of the device tree binding for this device used a set of power
1527 * supplies that didn't match the hardware inputs. This happened to work for a
1528 * number of cases but is not future proof. However to preserve backwards-
1529 * compatibility with old device trees, this function will try to use the old
1532 static int tegra_pcie_get_legacy_regulators(struct tegra_pcie *pcie)
1534 struct device_node *np = pcie->dev->of_node;
1536 if (of_device_is_compatible(np, "nvidia,tegra30-pcie"))
1537 pcie->num_supplies = 3;
1538 else if (of_device_is_compatible(np, "nvidia,tegra20-pcie"))
1539 pcie->num_supplies = 2;
1541 if (pcie->num_supplies == 0) {
1542 dev_err(pcie->dev, "device %s not supported in legacy mode\n",
1547 pcie->supplies = devm_kcalloc(pcie->dev, pcie->num_supplies,
1548 sizeof(*pcie->supplies),
1550 if (!pcie->supplies)
1553 pcie->supplies[0].supply = "pex-clk";
1554 pcie->supplies[1].supply = "vdd";
1556 if (pcie->num_supplies > 2)
1557 pcie->supplies[2].supply = "avdd";
1559 return devm_regulator_bulk_get(pcie->dev, pcie->num_supplies,
1564 * Obtains the list of regulators required for a particular generation of the
1567 * This would've been nice to do simply by providing static tables for use
1568 * with the regulator_bulk_*() API, but unfortunately Tegra30 is a bit quirky
1569 * in that it has two pairs or AVDD_PEX and VDD_PEX supplies (PEXA and PEXB)
1570 * and either seems to be optional depending on which ports are being used.
1572 static int tegra_pcie_get_regulators(struct tegra_pcie *pcie, u32 lane_mask)
1574 struct device_node *np = pcie->dev->of_node;
1577 if (of_device_is_compatible(np, "nvidia,tegra124-pcie")) {
1578 pcie->num_supplies = 7;
1580 pcie->supplies = devm_kcalloc(pcie->dev, pcie->num_supplies,
1581 sizeof(*pcie->supplies),
1583 if (!pcie->supplies)
1586 pcie->supplies[i++].supply = "avddio-pex";
1587 pcie->supplies[i++].supply = "dvddio-pex";
1588 pcie->supplies[i++].supply = "avdd-pex-pll";
1589 pcie->supplies[i++].supply = "hvdd-pex";
1590 pcie->supplies[i++].supply = "hvdd-pex-pll-e";
1591 pcie->supplies[i++].supply = "vddio-pex-ctl";
1592 pcie->supplies[i++].supply = "avdd-pll-erefe";
1593 } else if (of_device_is_compatible(np, "nvidia,tegra30-pcie")) {
1594 bool need_pexa = false, need_pexb = false;
1596 /* VDD_PEXA and AVDD_PEXA supply lanes 0 to 3 */
1597 if (lane_mask & 0x0f)
1600 /* VDD_PEXB and AVDD_PEXB supply lanes 4 to 5 */
1601 if (lane_mask & 0x30)
1604 pcie->num_supplies = 4 + (need_pexa ? 2 : 0) +
1605 (need_pexb ? 2 : 0);
1607 pcie->supplies = devm_kcalloc(pcie->dev, pcie->num_supplies,
1608 sizeof(*pcie->supplies),
1610 if (!pcie->supplies)
1613 pcie->supplies[i++].supply = "avdd-pex-pll";
1614 pcie->supplies[i++].supply = "hvdd-pex";
1615 pcie->supplies[i++].supply = "vddio-pex-ctl";
1616 pcie->supplies[i++].supply = "avdd-plle";
1619 pcie->supplies[i++].supply = "avdd-pexa";
1620 pcie->supplies[i++].supply = "vdd-pexa";
1624 pcie->supplies[i++].supply = "avdd-pexb";
1625 pcie->supplies[i++].supply = "vdd-pexb";
1627 } else if (of_device_is_compatible(np, "nvidia,tegra20-pcie")) {
1628 pcie->num_supplies = 5;
1630 pcie->supplies = devm_kcalloc(pcie->dev, pcie->num_supplies,
1631 sizeof(*pcie->supplies),
1633 if (!pcie->supplies)
1636 pcie->supplies[0].supply = "avdd-pex";
1637 pcie->supplies[1].supply = "vdd-pex";
1638 pcie->supplies[2].supply = "avdd-pex-pll";
1639 pcie->supplies[3].supply = "avdd-plle";
1640 pcie->supplies[4].supply = "vddio-pex-clk";
1643 if (of_regulator_bulk_available(pcie->dev->of_node, pcie->supplies,
1644 pcie->num_supplies))
1645 return devm_regulator_bulk_get(pcie->dev, pcie->num_supplies,
1649 * If not all regulators are available for this new scheme, assume
1650 * that the device tree complies with an older version of the device
1653 dev_info(pcie->dev, "using legacy DT binding for power supplies\n");
1655 devm_kfree(pcie->dev, pcie->supplies);
1656 pcie->num_supplies = 0;
1658 return tegra_pcie_get_legacy_regulators(pcie);
1661 static int tegra_pcie_parse_dt(struct tegra_pcie *pcie)
1663 const struct tegra_pcie_soc_data *soc = pcie->soc_data;
1664 struct device_node *np = pcie->dev->of_node, *port;
1665 struct of_pci_range_parser parser;
1666 struct of_pci_range range;
1667 u32 lanes = 0, mask = 0;
1668 unsigned int lane = 0;
1669 struct resource res;
1672 memset(&pcie->all, 0, sizeof(pcie->all));
1673 pcie->all.flags = IORESOURCE_MEM;
1674 pcie->all.name = np->full_name;
1675 pcie->all.start = ~0;
1678 if (of_pci_range_parser_init(&parser, np)) {
1679 dev_err(pcie->dev, "missing \"ranges\" property\n");
1683 for_each_of_pci_range(&parser, &range) {
1684 err = of_pci_range_to_resource(&range, np, &res);
1688 switch (res.flags & IORESOURCE_TYPE_BITS) {
1690 memcpy(&pcie->pio, &res, sizeof(res));
1691 pcie->pio.name = np->full_name;
1694 * The Tegra PCIe host bridge uses this to program the
1695 * mapping of the I/O space to the physical address,
1696 * so we override the .start and .end fields here that
1697 * of_pci_range_to_resource() converted to I/O space.
1698 * We also set the IORESOURCE_MEM type to clarify that
1699 * the resource is in the physical memory space.
1701 pcie->io.start = range.cpu_addr;
1702 pcie->io.end = range.cpu_addr + range.size - 1;
1703 pcie->io.flags = IORESOURCE_MEM;
1704 pcie->io.name = "I/O";
1706 memcpy(&res, &pcie->io, sizeof(res));
1709 case IORESOURCE_MEM:
1710 if (res.flags & IORESOURCE_PREFETCH) {
1711 memcpy(&pcie->prefetch, &res, sizeof(res));
1712 pcie->prefetch.name = "prefetchable";
1714 memcpy(&pcie->mem, &res, sizeof(res));
1715 pcie->mem.name = "non-prefetchable";
1720 if (res.start <= pcie->all.start)
1721 pcie->all.start = res.start;
1723 if (res.end >= pcie->all.end)
1724 pcie->all.end = res.end;
1727 err = devm_request_resource(pcie->dev, &iomem_resource, &pcie->all);
1731 err = of_pci_parse_bus_range(np, &pcie->busn);
1733 dev_err(pcie->dev, "failed to parse ranges property: %d\n",
1735 pcie->busn.name = np->name;
1736 pcie->busn.start = 0;
1737 pcie->busn.end = 0xff;
1738 pcie->busn.flags = IORESOURCE_BUS;
1741 /* parse root ports */
1742 for_each_child_of_node(np, port) {
1743 struct tegra_pcie_port *rp;
1747 err = of_pci_get_devfn(port);
1749 dev_err(pcie->dev, "failed to parse address: %d\n",
1754 index = PCI_SLOT(err);
1756 if (index < 1 || index > soc->num_ports) {
1757 dev_err(pcie->dev, "invalid port number: %d\n", index);
1763 err = of_property_read_u32(port, "nvidia,num-lanes", &value);
1765 dev_err(pcie->dev, "failed to parse # of lanes: %d\n",
1771 dev_err(pcie->dev, "invalid # of lanes: %u\n", value);
1775 lanes |= value << (index << 3);
1777 if (!of_device_is_available(port)) {
1782 mask |= ((1 << value) - 1) << lane;
1785 rp = devm_kzalloc(pcie->dev, sizeof(*rp), GFP_KERNEL);
1789 err = of_address_to_resource(port, 0, &rp->regs);
1791 dev_err(pcie->dev, "failed to parse address: %d\n",
1796 INIT_LIST_HEAD(&rp->list);
1801 rp->base = devm_ioremap_resource(pcie->dev, &rp->regs);
1802 if (IS_ERR(rp->base))
1803 return PTR_ERR(rp->base);
1805 list_add_tail(&rp->list, &pcie->ports);
1808 err = tegra_pcie_get_xbar_config(pcie, lanes, &pcie->xbar_config);
1810 dev_err(pcie->dev, "invalid lane configuration\n");
1814 err = tegra_pcie_get_regulators(pcie, mask);
1822 * FIXME: If there are no PCIe cards attached, then calling this function
1823 * can result in the increase of the bootup time as there are big timeout
1826 #define TEGRA_PCIE_LINKUP_TIMEOUT 200 /* up to 1.2 seconds */
1827 static bool tegra_pcie_port_check_link(struct tegra_pcie_port *port)
1829 unsigned int retries = 3;
1830 unsigned long value;
1832 /* override presence detection */
1833 value = readl(port->base + RP_PRIV_MISC);
1834 value &= ~RP_PRIV_MISC_PRSNT_MAP_EP_ABSNT;
1835 value |= RP_PRIV_MISC_PRSNT_MAP_EP_PRSNT;
1836 writel(value, port->base + RP_PRIV_MISC);
1839 unsigned int timeout = TEGRA_PCIE_LINKUP_TIMEOUT;
1842 value = readl(port->base + RP_VEND_XP);
1844 if (value & RP_VEND_XP_DL_UP)
1847 usleep_range(1000, 2000);
1848 } while (--timeout);
1851 dev_err(port->pcie->dev, "link %u down, retrying\n",
1856 timeout = TEGRA_PCIE_LINKUP_TIMEOUT;
1859 value = readl(port->base + RP_LINK_CONTROL_STATUS);
1861 if (value & RP_LINK_CONTROL_STATUS_DL_LINK_ACTIVE)
1864 usleep_range(1000, 2000);
1865 } while (--timeout);
1868 tegra_pcie_port_reset(port);
1869 } while (--retries);
1874 static int tegra_pcie_enable(struct tegra_pcie *pcie)
1876 struct tegra_pcie_port *port, *tmp;
1879 list_for_each_entry_safe(port, tmp, &pcie->ports, list) {
1880 dev_info(pcie->dev, "probing port %u, using %u lanes\n",
1881 port->index, port->lanes);
1883 tegra_pcie_port_enable(port);
1885 if (tegra_pcie_port_check_link(port))
1888 dev_info(pcie->dev, "link %u down, ignoring\n", port->index);
1890 tegra_pcie_port_disable(port);
1891 tegra_pcie_port_free(port);
1894 memset(&hw, 0, sizeof(hw));
1896 hw.nr_controllers = 1;
1897 hw.private_data = (void **)&pcie;
1898 hw.setup = tegra_pcie_setup;
1899 hw.map_irq = tegra_pcie_map_irq;
1900 hw.add_bus = tegra_pcie_add_bus;
1901 hw.scan = tegra_pcie_scan_bus;
1902 hw.ops = &tegra_pcie_ops;
1904 pci_common_init_dev(pcie->dev, &hw);
1909 static const struct tegra_pcie_soc_data tegra20_pcie_data = {
1911 .msi_base_shift = 0,
1912 .pads_pll_ctl = PADS_PLL_CTL_TEGRA20,
1913 .tx_ref_sel = PADS_PLL_CTL_TXCLKREF_DIV10,
1914 .has_pex_clkreq_en = false,
1915 .has_pex_bias_ctrl = false,
1916 .has_intr_prsnt_sense = false,
1917 .has_cml_clk = false,
1921 static const struct tegra_pcie_soc_data tegra30_pcie_data = {
1923 .msi_base_shift = 8,
1924 .pads_pll_ctl = PADS_PLL_CTL_TEGRA30,
1925 .tx_ref_sel = PADS_PLL_CTL_TXCLKREF_BUF_EN,
1926 .has_pex_clkreq_en = true,
1927 .has_pex_bias_ctrl = true,
1928 .has_intr_prsnt_sense = true,
1929 .has_cml_clk = true,
1933 static const struct tegra_pcie_soc_data tegra124_pcie_data = {
1935 .msi_base_shift = 8,
1936 .pads_pll_ctl = PADS_PLL_CTL_TEGRA30,
1937 .tx_ref_sel = PADS_PLL_CTL_TXCLKREF_BUF_EN,
1938 .has_pex_clkreq_en = true,
1939 .has_pex_bias_ctrl = true,
1940 .has_intr_prsnt_sense = true,
1941 .has_cml_clk = true,
1945 static const struct of_device_id tegra_pcie_of_match[] = {
1946 { .compatible = "nvidia,tegra124-pcie", .data = &tegra124_pcie_data },
1947 { .compatible = "nvidia,tegra30-pcie", .data = &tegra30_pcie_data },
1948 { .compatible = "nvidia,tegra20-pcie", .data = &tegra20_pcie_data },
1951 MODULE_DEVICE_TABLE(of, tegra_pcie_of_match);
1953 static void *tegra_pcie_ports_seq_start(struct seq_file *s, loff_t *pos)
1955 struct tegra_pcie *pcie = s->private;
1957 if (list_empty(&pcie->ports))
1960 seq_printf(s, "Index Status\n");
1962 return seq_list_start(&pcie->ports, *pos);
1965 static void *tegra_pcie_ports_seq_next(struct seq_file *s, void *v, loff_t *pos)
1967 struct tegra_pcie *pcie = s->private;
1969 return seq_list_next(v, &pcie->ports, pos);
1972 static void tegra_pcie_ports_seq_stop(struct seq_file *s, void *v)
1976 static int tegra_pcie_ports_seq_show(struct seq_file *s, void *v)
1978 bool up = false, active = false;
1979 struct tegra_pcie_port *port;
1982 port = list_entry(v, struct tegra_pcie_port, list);
1984 value = readl(port->base + RP_VEND_XP);
1986 if (value & RP_VEND_XP_DL_UP)
1989 value = readl(port->base + RP_LINK_CONTROL_STATUS);
1991 if (value & RP_LINK_CONTROL_STATUS_DL_LINK_ACTIVE)
1994 seq_printf(s, "%2u ", port->index);
1997 seq_printf(s, "up");
2001 seq_printf(s, ", ");
2003 seq_printf(s, "active");
2006 seq_printf(s, "\n");
2010 static const struct seq_operations tegra_pcie_ports_seq_ops = {
2011 .start = tegra_pcie_ports_seq_start,
2012 .next = tegra_pcie_ports_seq_next,
2013 .stop = tegra_pcie_ports_seq_stop,
2014 .show = tegra_pcie_ports_seq_show,
2017 static int tegra_pcie_ports_open(struct inode *inode, struct file *file)
2019 struct tegra_pcie *pcie = inode->i_private;
2023 err = seq_open(file, &tegra_pcie_ports_seq_ops);
2027 s = file->private_data;
2033 static const struct file_operations tegra_pcie_ports_ops = {
2034 .owner = THIS_MODULE,
2035 .open = tegra_pcie_ports_open,
2037 .llseek = seq_lseek,
2038 .release = seq_release,
2041 static int tegra_pcie_debugfs_init(struct tegra_pcie *pcie)
2043 struct dentry *file;
2045 pcie->debugfs = debugfs_create_dir("pcie", NULL);
2049 file = debugfs_create_file("ports", S_IFREG | S_IRUGO, pcie->debugfs,
2050 pcie, &tegra_pcie_ports_ops);
2057 debugfs_remove_recursive(pcie->debugfs);
2058 pcie->debugfs = NULL;
2062 static int tegra_pcie_probe(struct platform_device *pdev)
2064 const struct of_device_id *match;
2065 struct tegra_pcie *pcie;
2068 match = of_match_device(tegra_pcie_of_match, &pdev->dev);
2072 pcie = devm_kzalloc(&pdev->dev, sizeof(*pcie), GFP_KERNEL);
2076 INIT_LIST_HEAD(&pcie->buses);
2077 INIT_LIST_HEAD(&pcie->ports);
2078 pcie->soc_data = match->data;
2079 pcie->dev = &pdev->dev;
2081 err = tegra_pcie_parse_dt(pcie);
2085 pcibios_min_mem = 0;
2087 err = tegra_pcie_get_resources(pcie);
2089 dev_err(&pdev->dev, "failed to request resources: %d\n", err);
2093 err = tegra_pcie_enable_controller(pcie);
2097 /* setup the AFI address translations */
2098 tegra_pcie_setup_translations(pcie);
2100 if (IS_ENABLED(CONFIG_PCI_MSI)) {
2101 err = tegra_pcie_enable_msi(pcie);
2104 "failed to enable MSI support: %d\n",
2110 err = tegra_pcie_enable(pcie);
2112 dev_err(&pdev->dev, "failed to enable PCIe ports: %d\n", err);
2116 if (IS_ENABLED(CONFIG_DEBUG_FS)) {
2117 err = tegra_pcie_debugfs_init(pcie);
2119 dev_err(&pdev->dev, "failed to setup debugfs: %d\n",
2123 platform_set_drvdata(pdev, pcie);
2127 if (IS_ENABLED(CONFIG_PCI_MSI))
2128 tegra_pcie_disable_msi(pcie);
2130 tegra_pcie_put_resources(pcie);
2134 static struct platform_driver tegra_pcie_driver = {
2136 .name = "tegra-pcie",
2137 .owner = THIS_MODULE,
2138 .of_match_table = tegra_pcie_of_match,
2139 .suppress_bind_attrs = true,
2141 .probe = tegra_pcie_probe,
2143 module_platform_driver(tegra_pcie_driver);
2145 MODULE_AUTHOR("Thierry Reding <treding@nvidia.com>");
2146 MODULE_DESCRIPTION("NVIDIA Tegra PCIe driver");
2147 MODULE_LICENSE("GPL v2");