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_PRIV_MISC 0x00000fe0
192 #define RP_PRIV_MISC_PRSNT_MAP_EP_PRSNT (0xe << 0)
193 #define RP_PRIV_MISC_PRSNT_MAP_EP_ABSNT (0xf << 0)
195 #define RP_LINK_CONTROL_STATUS 0x00000090
196 #define RP_LINK_CONTROL_STATUS_DL_LINK_ACTIVE 0x20000000
197 #define RP_LINK_CONTROL_STATUS_LINKSTAT_MASK 0x3fff0000
199 #define PADS_CTL_SEL 0x0000009c
201 #define PADS_CTL 0x000000a0
202 #define PADS_CTL_IDDQ_1L (1 << 0)
203 #define PADS_CTL_TX_DATA_EN_1L (1 << 6)
204 #define PADS_CTL_RX_DATA_EN_1L (1 << 10)
206 #define PADS_PLL_CTL_TEGRA20 0x000000b8
207 #define PADS_PLL_CTL_TEGRA30 0x000000b4
208 #define PADS_PLL_CTL_RST_B4SM (1 << 1)
209 #define PADS_PLL_CTL_LOCKDET (1 << 8)
210 #define PADS_PLL_CTL_REFCLK_MASK (0x3 << 16)
211 #define PADS_PLL_CTL_REFCLK_INTERNAL_CML (0 << 16)
212 #define PADS_PLL_CTL_REFCLK_INTERNAL_CMOS (1 << 16)
213 #define PADS_PLL_CTL_REFCLK_EXTERNAL (2 << 16)
214 #define PADS_PLL_CTL_TXCLKREF_MASK (0x1 << 20)
215 #define PADS_PLL_CTL_TXCLKREF_DIV10 (0 << 20)
216 #define PADS_PLL_CTL_TXCLKREF_DIV5 (1 << 20)
217 #define PADS_PLL_CTL_TXCLKREF_BUF_EN (1 << 22)
219 #define PADS_REFCLK_CFG0 0x000000c8
220 #define PADS_REFCLK_CFG1 0x000000cc
221 #define PADS_REFCLK_BIAS 0x000000d0
224 * Fields in PADS_REFCLK_CFG*. Those registers form an array of 16-bit
225 * entries, one entry per PCIe port. These field definitions and desired
226 * values aren't in the TRM, but do come from NVIDIA.
228 #define PADS_REFCLK_CFG_TERM_SHIFT 2 /* 6:2 */
229 #define PADS_REFCLK_CFG_E_TERM_SHIFT 7
230 #define PADS_REFCLK_CFG_PREDI_SHIFT 8 /* 11:8 */
231 #define PADS_REFCLK_CFG_DRVI_SHIFT 12 /* 15:12 */
234 struct msi_controller chip;
235 DECLARE_BITMAP(used, INT_PCI_MSI_NR);
236 struct irq_domain *domain;
242 /* used to differentiate between Tegra SoC generations */
243 struct tegra_pcie_soc {
244 unsigned int num_ports;
245 unsigned int msi_base_shift;
248 u32 pads_refclk_cfg0;
249 u32 pads_refclk_cfg1;
250 bool has_pex_clkreq_en;
251 bool has_pex_bias_ctrl;
252 bool has_intr_prsnt_sense;
257 static inline struct tegra_msi *to_tegra_msi(struct msi_controller *chip)
259 return container_of(chip, struct tegra_msi, chip);
269 struct list_head buses;
275 struct resource prefetch;
276 struct resource busn;
288 struct reset_control *pex_rst;
289 struct reset_control *afi_rst;
290 struct reset_control *pcie_xrst;
295 struct tegra_msi msi;
297 struct list_head ports;
300 struct regulator_bulk_data *supplies;
301 unsigned int num_supplies;
303 const struct tegra_pcie_soc *soc;
304 struct dentry *debugfs;
307 struct tegra_pcie_port {
308 struct tegra_pcie *pcie;
309 struct device_node *np;
310 struct list_head list;
311 struct resource regs;
319 struct tegra_pcie_bus {
320 struct vm_struct *area;
321 struct list_head list;
325 static inline struct tegra_pcie *sys_to_pcie(struct pci_sys_data *sys)
327 return sys->private_data;
330 static inline void afi_writel(struct tegra_pcie *pcie, u32 value,
331 unsigned long offset)
333 writel(value, pcie->afi + offset);
336 static inline u32 afi_readl(struct tegra_pcie *pcie, unsigned long offset)
338 return readl(pcie->afi + offset);
341 static inline void pads_writel(struct tegra_pcie *pcie, u32 value,
342 unsigned long offset)
344 writel(value, pcie->pads + offset);
347 static inline u32 pads_readl(struct tegra_pcie *pcie, unsigned long offset)
349 return readl(pcie->pads + offset);
353 * The configuration space mapping on Tegra is somewhat similar to the ECAM
354 * defined by PCIe. However it deviates a bit in how the 4 bits for extended
355 * register accesses are mapped:
357 * [27:24] extended register number
359 * [15:11] device number
360 * [10: 8] function number
361 * [ 7: 0] register number
363 * Mapping the whole extended configuration space would require 256 MiB of
364 * virtual address space, only a small part of which will actually be used.
365 * To work around this, a 1 MiB of virtual addresses are allocated per bus
366 * when the bus is first accessed. When the physical range is mapped, the
367 * the bus number bits are hidden so that the extended register number bits
368 * appear as bits [19:16]. Therefore the virtual mapping looks like this:
370 * [19:16] extended register number
371 * [15:11] device number
372 * [10: 8] function number
373 * [ 7: 0] register number
375 * This is achieved by stitching together 16 chunks of 64 KiB of physical
376 * address space via the MMU.
378 static unsigned long tegra_pcie_conf_offset(unsigned int devfn, int where)
380 return ((where & 0xf00) << 8) | (PCI_SLOT(devfn) << 11) |
381 (PCI_FUNC(devfn) << 8) | (where & 0xfc);
384 static struct tegra_pcie_bus *tegra_pcie_bus_alloc(struct tegra_pcie *pcie,
387 struct device *dev = pcie->dev;
388 pgprot_t prot = __pgprot(L_PTE_PRESENT | L_PTE_YOUNG | L_PTE_DIRTY |
389 L_PTE_XN | L_PTE_MT_DEV_SHARED | L_PTE_SHARED);
390 phys_addr_t cs = pcie->cs->start;
391 struct tegra_pcie_bus *bus;
395 bus = kzalloc(sizeof(*bus), GFP_KERNEL);
397 return ERR_PTR(-ENOMEM);
399 INIT_LIST_HEAD(&bus->list);
402 /* allocate 1 MiB of virtual addresses */
403 bus->area = get_vm_area(SZ_1M, VM_IOREMAP);
409 /* map each of the 16 chunks of 64 KiB each */
410 for (i = 0; i < 16; i++) {
411 unsigned long virt = (unsigned long)bus->area->addr +
413 phys_addr_t phys = cs + i * SZ_16M + busnr * SZ_64K;
415 err = ioremap_page_range(virt, virt + SZ_64K, phys, prot);
417 dev_err(dev, "ioremap_page_range() failed: %d\n", err);
425 vunmap(bus->area->addr);
431 static int tegra_pcie_add_bus(struct pci_bus *bus)
433 struct tegra_pcie *pcie = sys_to_pcie(bus->sysdata);
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 tegra_pcie *pcie = sys_to_pcie(child->sysdata);
448 struct tegra_pcie_bus *bus, *tmp;
450 list_for_each_entry_safe(bus, tmp, &pcie->buses, list) {
451 if (bus->nr == child->number) {
452 vunmap(bus->area->addr);
453 list_del(&bus->list);
460 static void __iomem *tegra_pcie_map_bus(struct pci_bus *bus,
464 struct tegra_pcie *pcie = sys_to_pcie(bus->sysdata);
465 struct device *dev = pcie->dev;
466 void __iomem *addr = NULL;
468 if (bus->number == 0) {
469 unsigned int slot = PCI_SLOT(devfn);
470 struct tegra_pcie_port *port;
472 list_for_each_entry(port, &pcie->ports, list) {
473 if (port->index + 1 == slot) {
474 addr = port->base + (where & ~3);
479 struct tegra_pcie_bus *b;
481 list_for_each_entry(b, &pcie->buses, list)
482 if (b->nr == bus->number)
483 addr = (void __iomem *)b->area->addr;
486 dev_err(dev, "failed to map cfg. space for bus %u\n",
491 addr += tegra_pcie_conf_offset(devfn, where);
497 static struct pci_ops tegra_pcie_ops = {
498 .add_bus = tegra_pcie_add_bus,
499 .remove_bus = tegra_pcie_remove_bus,
500 .map_bus = tegra_pcie_map_bus,
501 .read = pci_generic_config_read32,
502 .write = pci_generic_config_write32,
505 static unsigned long tegra_pcie_port_get_pex_ctrl(struct tegra_pcie_port *port)
507 unsigned long ret = 0;
509 switch (port->index) {
526 static void tegra_pcie_port_reset(struct tegra_pcie_port *port)
528 unsigned long ctrl = tegra_pcie_port_get_pex_ctrl(port);
531 /* pulse reset signal */
532 value = afi_readl(port->pcie, ctrl);
533 value &= ~AFI_PEX_CTRL_RST;
534 afi_writel(port->pcie, value, ctrl);
536 usleep_range(1000, 2000);
538 value = afi_readl(port->pcie, ctrl);
539 value |= AFI_PEX_CTRL_RST;
540 afi_writel(port->pcie, value, ctrl);
543 static void tegra_pcie_port_enable(struct tegra_pcie_port *port)
545 unsigned long ctrl = tegra_pcie_port_get_pex_ctrl(port);
546 const struct tegra_pcie_soc *soc = port->pcie->soc;
549 /* enable reference clock */
550 value = afi_readl(port->pcie, ctrl);
551 value |= AFI_PEX_CTRL_REFCLK_EN;
553 if (soc->has_pex_clkreq_en)
554 value |= AFI_PEX_CTRL_CLKREQ_EN;
556 value |= AFI_PEX_CTRL_OVERRIDE_EN;
558 afi_writel(port->pcie, value, ctrl);
560 tegra_pcie_port_reset(port);
563 static void tegra_pcie_port_disable(struct tegra_pcie_port *port)
565 unsigned long ctrl = tegra_pcie_port_get_pex_ctrl(port);
566 const struct tegra_pcie_soc *soc = port->pcie->soc;
569 /* assert port reset */
570 value = afi_readl(port->pcie, ctrl);
571 value &= ~AFI_PEX_CTRL_RST;
572 afi_writel(port->pcie, value, ctrl);
574 /* disable reference clock */
575 value = afi_readl(port->pcie, ctrl);
577 if (soc->has_pex_clkreq_en)
578 value &= ~AFI_PEX_CTRL_CLKREQ_EN;
580 value &= ~AFI_PEX_CTRL_REFCLK_EN;
581 afi_writel(port->pcie, value, ctrl);
584 static void tegra_pcie_port_free(struct tegra_pcie_port *port)
586 struct tegra_pcie *pcie = port->pcie;
587 struct device *dev = pcie->dev;
589 devm_iounmap(dev, port->base);
590 devm_release_mem_region(dev, port->regs.start,
591 resource_size(&port->regs));
592 list_del(&port->list);
593 devm_kfree(dev, port);
596 /* Tegra PCIE root complex wrongly reports device class */
597 static void tegra_pcie_fixup_class(struct pci_dev *dev)
599 dev->class = PCI_CLASS_BRIDGE_PCI << 8;
601 DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_NVIDIA, 0x0bf0, tegra_pcie_fixup_class);
602 DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_NVIDIA, 0x0bf1, tegra_pcie_fixup_class);
603 DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_NVIDIA, 0x0e1c, tegra_pcie_fixup_class);
604 DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_NVIDIA, 0x0e1d, tegra_pcie_fixup_class);
606 /* Tegra PCIE requires relaxed ordering */
607 static void tegra_pcie_relax_enable(struct pci_dev *dev)
609 pcie_capability_set_word(dev, PCI_EXP_DEVCTL, PCI_EXP_DEVCTL_RELAX_EN);
611 DECLARE_PCI_FIXUP_FINAL(PCI_ANY_ID, PCI_ANY_ID, tegra_pcie_relax_enable);
613 static int tegra_pcie_setup(int nr, struct pci_sys_data *sys)
615 struct tegra_pcie *pcie = sys_to_pcie(sys);
616 struct device *dev = pcie->dev;
619 sys->mem_offset = pcie->offset.mem;
620 sys->io_offset = pcie->offset.io;
622 err = devm_request_resource(dev, &iomem_resource, &pcie->io);
626 err = pci_remap_iospace(&pcie->pio, pcie->io.start);
628 pci_add_resource_offset(&sys->resources, &pcie->pio,
631 pci_add_resource_offset(&sys->resources, &pcie->mem, sys->mem_offset);
632 pci_add_resource_offset(&sys->resources, &pcie->prefetch,
634 pci_add_resource(&sys->resources, &pcie->busn);
636 err = devm_request_pci_bus_resources(dev, &sys->resources);
643 static int tegra_pcie_map_irq(const struct pci_dev *pdev, u8 slot, u8 pin)
645 struct tegra_pcie *pcie = sys_to_pcie(pdev->bus->sysdata);
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 device *dev = pcie->dev;
1503 struct platform_device *pdev = to_platform_device(dev);
1504 const struct tegra_pcie_soc *soc = pcie->soc;
1505 struct tegra_msi *msi = &pcie->msi;
1510 mutex_init(&msi->lock);
1512 msi->chip.dev = dev;
1513 msi->chip.setup_irq = tegra_msi_setup_irq;
1514 msi->chip.teardown_irq = tegra_msi_teardown_irq;
1516 msi->domain = irq_domain_add_linear(dev->of_node, INT_PCI_MSI_NR,
1517 &msi_domain_ops, &msi->chip);
1519 dev_err(dev, "failed to create IRQ domain\n");
1523 err = platform_get_irq_byname(pdev, "msi");
1525 dev_err(dev, "failed to get IRQ: %d\n", err);
1531 err = request_irq(msi->irq, tegra_pcie_msi_irq, IRQF_NO_THREAD,
1532 tegra_msi_irq_chip.name, pcie);
1534 dev_err(dev, "failed to request IRQ: %d\n", err);
1538 /* setup AFI/FPCI range */
1539 msi->pages = __get_free_pages(GFP_KERNEL, 0);
1540 base = virt_to_phys((void *)msi->pages);
1542 afi_writel(pcie, base >> soc->msi_base_shift, AFI_MSI_FPCI_BAR_ST);
1543 afi_writel(pcie, base, AFI_MSI_AXI_BAR_ST);
1544 /* this register is in 4K increments */
1545 afi_writel(pcie, 1, AFI_MSI_BAR_SZ);
1547 /* enable all MSI vectors */
1548 afi_writel(pcie, 0xffffffff, AFI_MSI_EN_VEC0);
1549 afi_writel(pcie, 0xffffffff, AFI_MSI_EN_VEC1);
1550 afi_writel(pcie, 0xffffffff, AFI_MSI_EN_VEC2);
1551 afi_writel(pcie, 0xffffffff, AFI_MSI_EN_VEC3);
1552 afi_writel(pcie, 0xffffffff, AFI_MSI_EN_VEC4);
1553 afi_writel(pcie, 0xffffffff, AFI_MSI_EN_VEC5);
1554 afi_writel(pcie, 0xffffffff, AFI_MSI_EN_VEC6);
1555 afi_writel(pcie, 0xffffffff, AFI_MSI_EN_VEC7);
1557 /* and unmask the MSI interrupt */
1558 reg = afi_readl(pcie, AFI_INTR_MASK);
1559 reg |= AFI_INTR_MASK_MSI_MASK;
1560 afi_writel(pcie, reg, AFI_INTR_MASK);
1565 irq_domain_remove(msi->domain);
1569 static int tegra_pcie_disable_msi(struct tegra_pcie *pcie)
1571 struct tegra_msi *msi = &pcie->msi;
1572 unsigned int i, irq;
1575 /* mask the MSI interrupt */
1576 value = afi_readl(pcie, AFI_INTR_MASK);
1577 value &= ~AFI_INTR_MASK_MSI_MASK;
1578 afi_writel(pcie, value, AFI_INTR_MASK);
1580 /* disable all MSI vectors */
1581 afi_writel(pcie, 0, AFI_MSI_EN_VEC0);
1582 afi_writel(pcie, 0, AFI_MSI_EN_VEC1);
1583 afi_writel(pcie, 0, AFI_MSI_EN_VEC2);
1584 afi_writel(pcie, 0, AFI_MSI_EN_VEC3);
1585 afi_writel(pcie, 0, AFI_MSI_EN_VEC4);
1586 afi_writel(pcie, 0, AFI_MSI_EN_VEC5);
1587 afi_writel(pcie, 0, AFI_MSI_EN_VEC6);
1588 afi_writel(pcie, 0, AFI_MSI_EN_VEC7);
1590 free_pages(msi->pages, 0);
1593 free_irq(msi->irq, pcie);
1595 for (i = 0; i < INT_PCI_MSI_NR; i++) {
1596 irq = irq_find_mapping(msi->domain, i);
1598 irq_dispose_mapping(irq);
1601 irq_domain_remove(msi->domain);
1606 static int tegra_pcie_get_xbar_config(struct tegra_pcie *pcie, u32 lanes,
1609 struct device *dev = pcie->dev;
1610 struct device_node *np = dev->of_node;
1612 if (of_device_is_compatible(np, "nvidia,tegra124-pcie")) {
1615 dev_info(dev, "4x1, 1x1 configuration\n");
1616 *xbar = AFI_PCIE_CONFIG_SM2TMS0_XBAR_CONFIG_X4_X1;
1620 dev_info(dev, "2x1, 1x1 configuration\n");
1621 *xbar = AFI_PCIE_CONFIG_SM2TMS0_XBAR_CONFIG_X2_X1;
1624 } else if (of_device_is_compatible(np, "nvidia,tegra30-pcie")) {
1627 dev_info(dev, "4x1, 2x1 configuration\n");
1628 *xbar = AFI_PCIE_CONFIG_SM2TMS0_XBAR_CONFIG_420;
1632 dev_info(dev, "2x3 configuration\n");
1633 *xbar = AFI_PCIE_CONFIG_SM2TMS0_XBAR_CONFIG_222;
1637 dev_info(dev, "4x1, 1x2 configuration\n");
1638 *xbar = AFI_PCIE_CONFIG_SM2TMS0_XBAR_CONFIG_411;
1641 } else if (of_device_is_compatible(np, "nvidia,tegra20-pcie")) {
1644 dev_info(dev, "single-mode configuration\n");
1645 *xbar = AFI_PCIE_CONFIG_SM2TMS0_XBAR_CONFIG_SINGLE;
1649 dev_info(dev, "dual-mode configuration\n");
1650 *xbar = AFI_PCIE_CONFIG_SM2TMS0_XBAR_CONFIG_DUAL;
1659 * Check whether a given set of supplies is available in a device tree node.
1660 * This is used to check whether the new or the legacy device tree bindings
1663 static bool of_regulator_bulk_available(struct device_node *np,
1664 struct regulator_bulk_data *supplies,
1665 unsigned int num_supplies)
1670 for (i = 0; i < num_supplies; i++) {
1671 snprintf(property, 32, "%s-supply", supplies[i].supply);
1673 if (of_find_property(np, property, NULL) == NULL)
1681 * Old versions of the device tree binding for this device used a set of power
1682 * supplies that didn't match the hardware inputs. This happened to work for a
1683 * number of cases but is not future proof. However to preserve backwards-
1684 * compatibility with old device trees, this function will try to use the old
1687 static int tegra_pcie_get_legacy_regulators(struct tegra_pcie *pcie)
1689 struct device *dev = pcie->dev;
1690 struct device_node *np = dev->of_node;
1692 if (of_device_is_compatible(np, "nvidia,tegra30-pcie"))
1693 pcie->num_supplies = 3;
1694 else if (of_device_is_compatible(np, "nvidia,tegra20-pcie"))
1695 pcie->num_supplies = 2;
1697 if (pcie->num_supplies == 0) {
1698 dev_err(dev, "device %s not supported in legacy mode\n",
1703 pcie->supplies = devm_kcalloc(dev, pcie->num_supplies,
1704 sizeof(*pcie->supplies),
1706 if (!pcie->supplies)
1709 pcie->supplies[0].supply = "pex-clk";
1710 pcie->supplies[1].supply = "vdd";
1712 if (pcie->num_supplies > 2)
1713 pcie->supplies[2].supply = "avdd";
1715 return devm_regulator_bulk_get(dev, pcie->num_supplies, pcie->supplies);
1719 * Obtains the list of regulators required for a particular generation of the
1722 * This would've been nice to do simply by providing static tables for use
1723 * with the regulator_bulk_*() API, but unfortunately Tegra30 is a bit quirky
1724 * in that it has two pairs or AVDD_PEX and VDD_PEX supplies (PEXA and PEXB)
1725 * and either seems to be optional depending on which ports are being used.
1727 static int tegra_pcie_get_regulators(struct tegra_pcie *pcie, u32 lane_mask)
1729 struct device *dev = pcie->dev;
1730 struct device_node *np = dev->of_node;
1733 if (of_device_is_compatible(np, "nvidia,tegra124-pcie")) {
1734 pcie->num_supplies = 7;
1736 pcie->supplies = devm_kcalloc(dev, pcie->num_supplies,
1737 sizeof(*pcie->supplies),
1739 if (!pcie->supplies)
1742 pcie->supplies[i++].supply = "avddio-pex";
1743 pcie->supplies[i++].supply = "dvddio-pex";
1744 pcie->supplies[i++].supply = "avdd-pex-pll";
1745 pcie->supplies[i++].supply = "hvdd-pex";
1746 pcie->supplies[i++].supply = "hvdd-pex-pll-e";
1747 pcie->supplies[i++].supply = "vddio-pex-ctl";
1748 pcie->supplies[i++].supply = "avdd-pll-erefe";
1749 } else if (of_device_is_compatible(np, "nvidia,tegra30-pcie")) {
1750 bool need_pexa = false, need_pexb = false;
1752 /* VDD_PEXA and AVDD_PEXA supply lanes 0 to 3 */
1753 if (lane_mask & 0x0f)
1756 /* VDD_PEXB and AVDD_PEXB supply lanes 4 to 5 */
1757 if (lane_mask & 0x30)
1760 pcie->num_supplies = 4 + (need_pexa ? 2 : 0) +
1761 (need_pexb ? 2 : 0);
1763 pcie->supplies = devm_kcalloc(dev, pcie->num_supplies,
1764 sizeof(*pcie->supplies),
1766 if (!pcie->supplies)
1769 pcie->supplies[i++].supply = "avdd-pex-pll";
1770 pcie->supplies[i++].supply = "hvdd-pex";
1771 pcie->supplies[i++].supply = "vddio-pex-ctl";
1772 pcie->supplies[i++].supply = "avdd-plle";
1775 pcie->supplies[i++].supply = "avdd-pexa";
1776 pcie->supplies[i++].supply = "vdd-pexa";
1780 pcie->supplies[i++].supply = "avdd-pexb";
1781 pcie->supplies[i++].supply = "vdd-pexb";
1783 } else if (of_device_is_compatible(np, "nvidia,tegra20-pcie")) {
1784 pcie->num_supplies = 5;
1786 pcie->supplies = devm_kcalloc(dev, pcie->num_supplies,
1787 sizeof(*pcie->supplies),
1789 if (!pcie->supplies)
1792 pcie->supplies[0].supply = "avdd-pex";
1793 pcie->supplies[1].supply = "vdd-pex";
1794 pcie->supplies[2].supply = "avdd-pex-pll";
1795 pcie->supplies[3].supply = "avdd-plle";
1796 pcie->supplies[4].supply = "vddio-pex-clk";
1799 if (of_regulator_bulk_available(dev->of_node, pcie->supplies,
1800 pcie->num_supplies))
1801 return devm_regulator_bulk_get(dev, pcie->num_supplies,
1805 * If not all regulators are available for this new scheme, assume
1806 * that the device tree complies with an older version of the device
1809 dev_info(dev, "using legacy DT binding for power supplies\n");
1811 devm_kfree(dev, pcie->supplies);
1812 pcie->num_supplies = 0;
1814 return tegra_pcie_get_legacy_regulators(pcie);
1817 static int tegra_pcie_parse_dt(struct tegra_pcie *pcie)
1819 struct device *dev = pcie->dev;
1820 struct device_node *np = dev->of_node, *port;
1821 const struct tegra_pcie_soc *soc = pcie->soc;
1822 struct of_pci_range_parser parser;
1823 struct of_pci_range range;
1824 u32 lanes = 0, mask = 0;
1825 unsigned int lane = 0;
1826 struct resource res;
1829 if (of_pci_range_parser_init(&parser, np)) {
1830 dev_err(dev, "missing \"ranges\" property\n");
1834 for_each_of_pci_range(&parser, &range) {
1835 err = of_pci_range_to_resource(&range, np, &res);
1839 switch (res.flags & IORESOURCE_TYPE_BITS) {
1841 /* Track the bus -> CPU I/O mapping offset. */
1842 pcie->offset.io = res.start - range.pci_addr;
1844 memcpy(&pcie->pio, &res, sizeof(res));
1845 pcie->pio.name = np->full_name;
1848 * The Tegra PCIe host bridge uses this to program the
1849 * mapping of the I/O space to the physical address,
1850 * so we override the .start and .end fields here that
1851 * of_pci_range_to_resource() converted to I/O space.
1852 * We also set the IORESOURCE_MEM type to clarify that
1853 * the resource is in the physical memory space.
1855 pcie->io.start = range.cpu_addr;
1856 pcie->io.end = range.cpu_addr + range.size - 1;
1857 pcie->io.flags = IORESOURCE_MEM;
1858 pcie->io.name = "I/O";
1860 memcpy(&res, &pcie->io, sizeof(res));
1863 case IORESOURCE_MEM:
1865 * Track the bus -> CPU memory mapping offset. This
1866 * assumes that the prefetchable and non-prefetchable
1867 * regions will be the last of type IORESOURCE_MEM in
1868 * the ranges property.
1870 pcie->offset.mem = res.start - range.pci_addr;
1872 if (res.flags & IORESOURCE_PREFETCH) {
1873 memcpy(&pcie->prefetch, &res, sizeof(res));
1874 pcie->prefetch.name = "prefetchable";
1876 memcpy(&pcie->mem, &res, sizeof(res));
1877 pcie->mem.name = "non-prefetchable";
1883 err = of_pci_parse_bus_range(np, &pcie->busn);
1885 dev_err(dev, "failed to parse ranges property: %d\n", err);
1886 pcie->busn.name = np->name;
1887 pcie->busn.start = 0;
1888 pcie->busn.end = 0xff;
1889 pcie->busn.flags = IORESOURCE_BUS;
1892 /* parse root ports */
1893 for_each_child_of_node(np, port) {
1894 struct tegra_pcie_port *rp;
1898 err = of_pci_get_devfn(port);
1900 dev_err(dev, "failed to parse address: %d\n", err);
1904 index = PCI_SLOT(err);
1906 if (index < 1 || index > soc->num_ports) {
1907 dev_err(dev, "invalid port number: %d\n", index);
1913 err = of_property_read_u32(port, "nvidia,num-lanes", &value);
1915 dev_err(dev, "failed to parse # of lanes: %d\n",
1921 dev_err(dev, "invalid # of lanes: %u\n", value);
1925 lanes |= value << (index << 3);
1927 if (!of_device_is_available(port)) {
1932 mask |= ((1 << value) - 1) << lane;
1935 rp = devm_kzalloc(dev, sizeof(*rp), GFP_KERNEL);
1939 err = of_address_to_resource(port, 0, &rp->regs);
1941 dev_err(dev, "failed to parse address: %d\n", err);
1945 INIT_LIST_HEAD(&rp->list);
1951 rp->base = devm_ioremap_resource(dev, &rp->regs);
1952 if (IS_ERR(rp->base))
1953 return PTR_ERR(rp->base);
1955 list_add_tail(&rp->list, &pcie->ports);
1958 err = tegra_pcie_get_xbar_config(pcie, lanes, &pcie->xbar_config);
1960 dev_err(dev, "invalid lane configuration\n");
1964 err = tegra_pcie_get_regulators(pcie, mask);
1972 * FIXME: If there are no PCIe cards attached, then calling this function
1973 * can result in the increase of the bootup time as there are big timeout
1976 #define TEGRA_PCIE_LINKUP_TIMEOUT 200 /* up to 1.2 seconds */
1977 static bool tegra_pcie_port_check_link(struct tegra_pcie_port *port)
1979 struct device *dev = port->pcie->dev;
1980 unsigned int retries = 3;
1981 unsigned long value;
1983 /* override presence detection */
1984 value = readl(port->base + RP_PRIV_MISC);
1985 value &= ~RP_PRIV_MISC_PRSNT_MAP_EP_ABSNT;
1986 value |= RP_PRIV_MISC_PRSNT_MAP_EP_PRSNT;
1987 writel(value, port->base + RP_PRIV_MISC);
1990 unsigned int timeout = TEGRA_PCIE_LINKUP_TIMEOUT;
1993 value = readl(port->base + RP_VEND_XP);
1995 if (value & RP_VEND_XP_DL_UP)
1998 usleep_range(1000, 2000);
1999 } while (--timeout);
2002 dev_err(dev, "link %u down, retrying\n", port->index);
2006 timeout = TEGRA_PCIE_LINKUP_TIMEOUT;
2009 value = readl(port->base + RP_LINK_CONTROL_STATUS);
2011 if (value & RP_LINK_CONTROL_STATUS_DL_LINK_ACTIVE)
2014 usleep_range(1000, 2000);
2015 } while (--timeout);
2018 tegra_pcie_port_reset(port);
2019 } while (--retries);
2024 static int tegra_pcie_enable(struct tegra_pcie *pcie)
2026 struct device *dev = pcie->dev;
2027 struct tegra_pcie_port *port, *tmp;
2030 list_for_each_entry_safe(port, tmp, &pcie->ports, list) {
2031 dev_info(dev, "probing port %u, using %u lanes\n",
2032 port->index, port->lanes);
2034 tegra_pcie_port_enable(port);
2036 if (tegra_pcie_port_check_link(port))
2039 dev_info(dev, "link %u down, ignoring\n", port->index);
2041 tegra_pcie_port_disable(port);
2042 tegra_pcie_port_free(port);
2045 memset(&hw, 0, sizeof(hw));
2047 #ifdef CONFIG_PCI_MSI
2048 hw.msi_ctrl = &pcie->msi.chip;
2051 hw.nr_controllers = 1;
2052 hw.private_data = (void **)&pcie;
2053 hw.setup = tegra_pcie_setup;
2054 hw.map_irq = tegra_pcie_map_irq;
2055 hw.ops = &tegra_pcie_ops;
2057 pci_common_init_dev(dev, &hw);
2061 static const struct tegra_pcie_soc tegra20_pcie = {
2063 .msi_base_shift = 0,
2064 .pads_pll_ctl = PADS_PLL_CTL_TEGRA20,
2065 .tx_ref_sel = PADS_PLL_CTL_TXCLKREF_DIV10,
2066 .pads_refclk_cfg0 = 0xfa5cfa5c,
2067 .has_pex_clkreq_en = false,
2068 .has_pex_bias_ctrl = false,
2069 .has_intr_prsnt_sense = false,
2070 .has_cml_clk = false,
2074 static const struct tegra_pcie_soc tegra30_pcie = {
2076 .msi_base_shift = 8,
2077 .pads_pll_ctl = PADS_PLL_CTL_TEGRA30,
2078 .tx_ref_sel = PADS_PLL_CTL_TXCLKREF_BUF_EN,
2079 .pads_refclk_cfg0 = 0xfa5cfa5c,
2080 .pads_refclk_cfg1 = 0xfa5cfa5c,
2081 .has_pex_clkreq_en = true,
2082 .has_pex_bias_ctrl = true,
2083 .has_intr_prsnt_sense = true,
2084 .has_cml_clk = true,
2088 static const struct tegra_pcie_soc tegra124_pcie = {
2090 .msi_base_shift = 8,
2091 .pads_pll_ctl = PADS_PLL_CTL_TEGRA30,
2092 .tx_ref_sel = PADS_PLL_CTL_TXCLKREF_BUF_EN,
2093 .pads_refclk_cfg0 = 0x44ac44ac,
2094 .has_pex_clkreq_en = true,
2095 .has_pex_bias_ctrl = true,
2096 .has_intr_prsnt_sense = true,
2097 .has_cml_clk = true,
2101 static const struct of_device_id tegra_pcie_of_match[] = {
2102 { .compatible = "nvidia,tegra124-pcie", .data = &tegra124_pcie },
2103 { .compatible = "nvidia,tegra30-pcie", .data = &tegra30_pcie },
2104 { .compatible = "nvidia,tegra20-pcie", .data = &tegra20_pcie },
2108 static void *tegra_pcie_ports_seq_start(struct seq_file *s, loff_t *pos)
2110 struct tegra_pcie *pcie = s->private;
2112 if (list_empty(&pcie->ports))
2115 seq_printf(s, "Index Status\n");
2117 return seq_list_start(&pcie->ports, *pos);
2120 static void *tegra_pcie_ports_seq_next(struct seq_file *s, void *v, loff_t *pos)
2122 struct tegra_pcie *pcie = s->private;
2124 return seq_list_next(v, &pcie->ports, pos);
2127 static void tegra_pcie_ports_seq_stop(struct seq_file *s, void *v)
2131 static int tegra_pcie_ports_seq_show(struct seq_file *s, void *v)
2133 bool up = false, active = false;
2134 struct tegra_pcie_port *port;
2137 port = list_entry(v, struct tegra_pcie_port, list);
2139 value = readl(port->base + RP_VEND_XP);
2141 if (value & RP_VEND_XP_DL_UP)
2144 value = readl(port->base + RP_LINK_CONTROL_STATUS);
2146 if (value & RP_LINK_CONTROL_STATUS_DL_LINK_ACTIVE)
2149 seq_printf(s, "%2u ", port->index);
2152 seq_printf(s, "up");
2156 seq_printf(s, ", ");
2158 seq_printf(s, "active");
2161 seq_printf(s, "\n");
2165 static const struct seq_operations tegra_pcie_ports_seq_ops = {
2166 .start = tegra_pcie_ports_seq_start,
2167 .next = tegra_pcie_ports_seq_next,
2168 .stop = tegra_pcie_ports_seq_stop,
2169 .show = tegra_pcie_ports_seq_show,
2172 static int tegra_pcie_ports_open(struct inode *inode, struct file *file)
2174 struct tegra_pcie *pcie = inode->i_private;
2178 err = seq_open(file, &tegra_pcie_ports_seq_ops);
2182 s = file->private_data;
2188 static const struct file_operations tegra_pcie_ports_ops = {
2189 .owner = THIS_MODULE,
2190 .open = tegra_pcie_ports_open,
2192 .llseek = seq_lseek,
2193 .release = seq_release,
2196 static int tegra_pcie_debugfs_init(struct tegra_pcie *pcie)
2198 struct dentry *file;
2200 pcie->debugfs = debugfs_create_dir("pcie", NULL);
2204 file = debugfs_create_file("ports", S_IFREG | S_IRUGO, pcie->debugfs,
2205 pcie, &tegra_pcie_ports_ops);
2212 debugfs_remove_recursive(pcie->debugfs);
2213 pcie->debugfs = NULL;
2217 static int tegra_pcie_probe(struct platform_device *pdev)
2219 struct device *dev = &pdev->dev;
2220 struct tegra_pcie *pcie;
2223 pcie = devm_kzalloc(dev, sizeof(*pcie), GFP_KERNEL);
2227 pcie->soc = of_device_get_match_data(dev);
2228 INIT_LIST_HEAD(&pcie->buses);
2229 INIT_LIST_HEAD(&pcie->ports);
2232 err = tegra_pcie_parse_dt(pcie);
2236 err = tegra_pcie_get_resources(pcie);
2238 dev_err(dev, "failed to request resources: %d\n", err);
2242 err = tegra_pcie_enable_controller(pcie);
2246 /* setup the AFI address translations */
2247 tegra_pcie_setup_translations(pcie);
2249 if (IS_ENABLED(CONFIG_PCI_MSI)) {
2250 err = tegra_pcie_enable_msi(pcie);
2252 dev_err(dev, "failed to enable MSI support: %d\n", err);
2257 err = tegra_pcie_enable(pcie);
2259 dev_err(dev, "failed to enable PCIe ports: %d\n", err);
2263 if (IS_ENABLED(CONFIG_DEBUG_FS)) {
2264 err = tegra_pcie_debugfs_init(pcie);
2266 dev_err(dev, "failed to setup debugfs: %d\n", err);
2272 if (IS_ENABLED(CONFIG_PCI_MSI))
2273 tegra_pcie_disable_msi(pcie);
2275 tegra_pcie_put_resources(pcie);
2279 static struct platform_driver tegra_pcie_driver = {
2281 .name = "tegra-pcie",
2282 .of_match_table = tegra_pcie_of_match,
2283 .suppress_bind_attrs = true,
2285 .probe = tegra_pcie_probe,
2287 builtin_platform_driver(tegra_pcie_driver);