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77ffc146 MR |
1 | /* |
2 | * arch/arm/mach-tegra/pci.c | |
3 | * | |
4 | * PCIe host controller driver for TEGRA(2) SOCs | |
5 | * | |
6 | * Copyright (c) 2010, CompuLab, Ltd. | |
7 | * Author: Mike Rapoport <mike@compulab.co.il> | |
8 | * | |
9 | * Based on NVIDIA PCIe driver | |
10 | * Copyright (c) 2008-2009, NVIDIA Corporation. | |
11 | * | |
12 | * Bits taken from arch/arm/mach-dove/pcie.c | |
13 | * | |
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. | |
18 | * | |
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 | |
22 | * more details. | |
23 | * | |
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. | |
27 | */ | |
28 | ||
29 | #include <linux/kernel.h> | |
30 | #include <linux/pci.h> | |
31 | #include <linux/interrupt.h> | |
32 | #include <linux/irq.h> | |
33 | #include <linux/clk.h> | |
34 | #include <linux/delay.h> | |
dc28094b | 35 | #include <linux/export.h> |
61fd290d | 36 | #include <linux/clk/tegra.h> |
e4bcda28 | 37 | #include <linux/tegra-powergate.h> |
77ffc146 MR |
38 | |
39 | #include <asm/sizes.h> | |
40 | #include <asm/mach/pci.h> | |
41 | ||
3ead5137 | 42 | #include "board.h" |
2be39c07 | 43 | #include "iomap.h" |
3ead5137 | 44 | |
c5a4d6b0 SW |
45 | /* Hack - need to parse this from DT */ |
46 | #define INT_PCIE_INTR 130 | |
47 | ||
77ffc146 MR |
48 | /* register definitions */ |
49 | #define AFI_OFFSET 0x3800 | |
50 | #define PADS_OFFSET 0x3000 | |
51 | #define RP0_OFFSET 0x0000 | |
52 | #define RP1_OFFSET 0x1000 | |
53 | ||
54 | #define AFI_AXI_BAR0_SZ 0x00 | |
55 | #define AFI_AXI_BAR1_SZ 0x04 | |
56 | #define AFI_AXI_BAR2_SZ 0x08 | |
57 | #define AFI_AXI_BAR3_SZ 0x0c | |
58 | #define AFI_AXI_BAR4_SZ 0x10 | |
59 | #define AFI_AXI_BAR5_SZ 0x14 | |
60 | ||
61 | #define AFI_AXI_BAR0_START 0x18 | |
62 | #define AFI_AXI_BAR1_START 0x1c | |
63 | #define AFI_AXI_BAR2_START 0x20 | |
64 | #define AFI_AXI_BAR3_START 0x24 | |
65 | #define AFI_AXI_BAR4_START 0x28 | |
66 | #define AFI_AXI_BAR5_START 0x2c | |
67 | ||
68 | #define AFI_FPCI_BAR0 0x30 | |
69 | #define AFI_FPCI_BAR1 0x34 | |
70 | #define AFI_FPCI_BAR2 0x38 | |
71 | #define AFI_FPCI_BAR3 0x3c | |
72 | #define AFI_FPCI_BAR4 0x40 | |
73 | #define AFI_FPCI_BAR5 0x44 | |
74 | ||
75 | #define AFI_CACHE_BAR0_SZ 0x48 | |
76 | #define AFI_CACHE_BAR0_ST 0x4c | |
77 | #define AFI_CACHE_BAR1_SZ 0x50 | |
78 | #define AFI_CACHE_BAR1_ST 0x54 | |
79 | ||
80 | #define AFI_MSI_BAR_SZ 0x60 | |
81 | #define AFI_MSI_FPCI_BAR_ST 0x64 | |
82 | #define AFI_MSI_AXI_BAR_ST 0x68 | |
83 | ||
84 | #define AFI_CONFIGURATION 0xac | |
85 | #define AFI_CONFIGURATION_EN_FPCI (1 << 0) | |
86 | ||
87 | #define AFI_FPCI_ERROR_MASKS 0xb0 | |
88 | ||
89 | #define AFI_INTR_MASK 0xb4 | |
90 | #define AFI_INTR_MASK_INT_MASK (1 << 0) | |
91 | #define AFI_INTR_MASK_MSI_MASK (1 << 8) | |
92 | ||
93 | #define AFI_INTR_CODE 0xb8 | |
94 | #define AFI_INTR_CODE_MASK 0xf | |
95 | #define AFI_INTR_MASTER_ABORT 4 | |
96 | #define AFI_INTR_LEGACY 6 | |
97 | ||
98 | #define AFI_INTR_SIGNATURE 0xbc | |
99 | #define AFI_SM_INTR_ENABLE 0xc4 | |
100 | ||
101 | #define AFI_AFI_INTR_ENABLE 0xc8 | |
102 | #define AFI_INTR_EN_INI_SLVERR (1 << 0) | |
103 | #define AFI_INTR_EN_INI_DECERR (1 << 1) | |
104 | #define AFI_INTR_EN_TGT_SLVERR (1 << 2) | |
105 | #define AFI_INTR_EN_TGT_DECERR (1 << 3) | |
106 | #define AFI_INTR_EN_TGT_WRERR (1 << 4) | |
107 | #define AFI_INTR_EN_DFPCI_DECERR (1 << 5) | |
108 | #define AFI_INTR_EN_AXI_DECERR (1 << 6) | |
109 | #define AFI_INTR_EN_FPCI_TIMEOUT (1 << 7) | |
110 | ||
111 | #define AFI_PCIE_CONFIG 0x0f8 | |
112 | #define AFI_PCIE_CONFIG_PCIEC0_DISABLE_DEVICE (1 << 1) | |
113 | #define AFI_PCIE_CONFIG_PCIEC1_DISABLE_DEVICE (1 << 2) | |
114 | #define AFI_PCIE_CONFIG_SM2TMS0_XBAR_CONFIG_MASK (0xf << 20) | |
115 | #define AFI_PCIE_CONFIG_SM2TMS0_XBAR_CONFIG_SINGLE (0x0 << 20) | |
116 | #define AFI_PCIE_CONFIG_SM2TMS0_XBAR_CONFIG_DUAL (0x1 << 20) | |
117 | ||
118 | #define AFI_FUSE 0x104 | |
119 | #define AFI_FUSE_PCIE_T0_GEN2_DIS (1 << 2) | |
120 | ||
121 | #define AFI_PEX0_CTRL 0x110 | |
122 | #define AFI_PEX1_CTRL 0x118 | |
123 | #define AFI_PEX_CTRL_RST (1 << 0) | |
124 | #define AFI_PEX_CTRL_REFCLK_EN (1 << 3) | |
125 | ||
126 | #define RP_VEND_XP 0x00000F00 | |
127 | #define RP_VEND_XP_DL_UP (1 << 30) | |
128 | ||
129 | #define RP_LINK_CONTROL_STATUS 0x00000090 | |
130 | #define RP_LINK_CONTROL_STATUS_LINKSTAT_MASK 0x3fff0000 | |
131 | ||
132 | #define PADS_CTL_SEL 0x0000009C | |
133 | ||
134 | #define PADS_CTL 0x000000A0 | |
135 | #define PADS_CTL_IDDQ_1L (1 << 0) | |
136 | #define PADS_CTL_TX_DATA_EN_1L (1 << 6) | |
137 | #define PADS_CTL_RX_DATA_EN_1L (1 << 10) | |
138 | ||
139 | #define PADS_PLL_CTL 0x000000B8 | |
140 | #define PADS_PLL_CTL_RST_B4SM (1 << 1) | |
141 | #define PADS_PLL_CTL_LOCKDET (1 << 8) | |
142 | #define PADS_PLL_CTL_REFCLK_MASK (0x3 << 16) | |
143 | #define PADS_PLL_CTL_REFCLK_INTERNAL_CML (0 << 16) | |
144 | #define PADS_PLL_CTL_REFCLK_INTERNAL_CMOS (1 << 16) | |
145 | #define PADS_PLL_CTL_REFCLK_EXTERNAL (2 << 16) | |
146 | #define PADS_PLL_CTL_TXCLKREF_MASK (0x1 << 20) | |
147 | #define PADS_PLL_CTL_TXCLKREF_DIV10 (0 << 20) | |
148 | #define PADS_PLL_CTL_TXCLKREF_DIV5 (1 << 20) | |
149 | ||
150 | /* PMC access is required for PCIE xclk (un)clamping */ | |
151 | #define PMC_SCRATCH42 0x144 | |
152 | #define PMC_SCRATCH42_PCX_CLAMP (1 << 0) | |
153 | ||
154 | static void __iomem *reg_pmc_base = IO_ADDRESS(TEGRA_PMC_BASE); | |
155 | ||
156 | #define pmc_writel(value, reg) \ | |
efaa19a5 | 157 | __raw_writel(value, reg_pmc_base + (reg)) |
77ffc146 | 158 | #define pmc_readl(reg) \ |
efaa19a5 | 159 | __raw_readl(reg_pmc_base + (reg)) |
77ffc146 MR |
160 | |
161 | /* | |
162 | * Tegra2 defines 1GB in the AXI address map for PCIe. | |
163 | * | |
164 | * That address space is split into different regions, with sizes and | |
165 | * offsets as follows: | |
166 | * | |
167 | * 0x80000000 - 0x80003fff - PCI controller registers | |
168 | * 0x80004000 - 0x80103fff - PCI configuration space | |
169 | * 0x80104000 - 0x80203fff - PCI extended configuration space | |
170 | * 0x80203fff - 0x803fffff - unused | |
171 | * 0x80400000 - 0x8040ffff - downstream IO | |
172 | * 0x80410000 - 0x8fffffff - unused | |
173 | * 0x90000000 - 0x9fffffff - non-prefetchable memory | |
174 | * 0xa0000000 - 0xbfffffff - prefetchable memory | |
175 | */ | |
77ffc146 MR |
176 | #define PCIE_REGS_SZ SZ_16K |
177 | #define PCIE_CFG_OFF PCIE_REGS_SZ | |
178 | #define PCIE_CFG_SZ SZ_1M | |
179 | #define PCIE_EXT_CFG_OFF (PCIE_CFG_SZ + PCIE_CFG_OFF) | |
180 | #define PCIE_EXT_CFG_SZ SZ_1M | |
181 | #define PCIE_IOMAP_SZ (PCIE_REGS_SZ + PCIE_CFG_SZ + PCIE_EXT_CFG_SZ) | |
182 | ||
77ffc146 MR |
183 | #define MEM_BASE_0 (TEGRA_PCIE_BASE + SZ_256M) |
184 | #define MEM_SIZE_0 SZ_128M | |
185 | #define MEM_BASE_1 (MEM_BASE_0 + MEM_SIZE_0) | |
186 | #define MEM_SIZE_1 SZ_128M | |
187 | #define PREFETCH_MEM_BASE_0 (MEM_BASE_1 + MEM_SIZE_1) | |
188 | #define PREFETCH_MEM_SIZE_0 SZ_128M | |
189 | #define PREFETCH_MEM_BASE_1 (PREFETCH_MEM_BASE_0 + PREFETCH_MEM_SIZE_0) | |
190 | #define PREFETCH_MEM_SIZE_1 SZ_128M | |
191 | ||
192 | #define PCIE_CONF_BUS(b) ((b) << 16) | |
193 | #define PCIE_CONF_DEV(d) ((d) << 11) | |
194 | #define PCIE_CONF_FUNC(f) ((f) << 8) | |
195 | #define PCIE_CONF_REG(r) \ | |
196 | (((r) & ~0x3) | (((r) < 256) ? PCIE_CFG_OFF : PCIE_EXT_CFG_OFF)) | |
197 | ||
198 | struct tegra_pcie_port { | |
199 | int index; | |
200 | u8 root_bus_nr; | |
201 | void __iomem *base; | |
202 | ||
203 | bool link_up; | |
204 | ||
77ffc146 MR |
205 | char mem_space_name[16]; |
206 | char prefetch_space_name[20]; | |
d94c7a04 | 207 | struct resource res[2]; |
77ffc146 MR |
208 | }; |
209 | ||
210 | struct tegra_pcie_info { | |
211 | struct tegra_pcie_port port[2]; | |
212 | int num_ports; | |
213 | ||
214 | void __iomem *regs; | |
215 | struct resource res_mmio; | |
216 | ||
217 | struct clk *pex_clk; | |
218 | struct clk *afi_clk; | |
219 | struct clk *pcie_xclk; | |
220 | struct clk *pll_e; | |
221 | }; | |
222 | ||
d94c7a04 | 223 | static struct tegra_pcie_info tegra_pcie; |
77ffc146 MR |
224 | |
225 | static inline void afi_writel(u32 value, unsigned long offset) | |
226 | { | |
227 | writel(value, offset + AFI_OFFSET + tegra_pcie.regs); | |
228 | } | |
229 | ||
230 | static inline u32 afi_readl(unsigned long offset) | |
231 | { | |
232 | return readl(offset + AFI_OFFSET + tegra_pcie.regs); | |
233 | } | |
234 | ||
235 | static inline void pads_writel(u32 value, unsigned long offset) | |
236 | { | |
237 | writel(value, offset + PADS_OFFSET + tegra_pcie.regs); | |
238 | } | |
239 | ||
240 | static inline u32 pads_readl(unsigned long offset) | |
241 | { | |
242 | return readl(offset + PADS_OFFSET + tegra_pcie.regs); | |
243 | } | |
244 | ||
245 | static struct tegra_pcie_port *bus_to_port(int bus) | |
246 | { | |
247 | int i; | |
248 | ||
249 | for (i = tegra_pcie.num_ports - 1; i >= 0; i--) { | |
250 | int rbus = tegra_pcie.port[i].root_bus_nr; | |
251 | if (rbus != -1 && rbus == bus) | |
252 | break; | |
253 | } | |
254 | ||
255 | return i >= 0 ? tegra_pcie.port + i : NULL; | |
256 | } | |
257 | ||
258 | static int tegra_pcie_read_conf(struct pci_bus *bus, unsigned int devfn, | |
259 | int where, int size, u32 *val) | |
260 | { | |
261 | struct tegra_pcie_port *pp = bus_to_port(bus->number); | |
262 | void __iomem *addr; | |
263 | ||
264 | if (pp) { | |
265 | if (devfn != 0) { | |
266 | *val = 0xffffffff; | |
267 | return PCIBIOS_DEVICE_NOT_FOUND; | |
268 | } | |
269 | ||
270 | addr = pp->base + (where & ~0x3); | |
271 | } else { | |
272 | addr = tegra_pcie.regs + (PCIE_CONF_BUS(bus->number) + | |
273 | PCIE_CONF_DEV(PCI_SLOT(devfn)) + | |
274 | PCIE_CONF_FUNC(PCI_FUNC(devfn)) + | |
275 | PCIE_CONF_REG(where)); | |
276 | } | |
277 | ||
278 | *val = readl(addr); | |
279 | ||
280 | if (size == 1) | |
281 | *val = (*val >> (8 * (where & 3))) & 0xff; | |
282 | else if (size == 2) | |
283 | *val = (*val >> (8 * (where & 3))) & 0xffff; | |
284 | ||
285 | return PCIBIOS_SUCCESSFUL; | |
286 | } | |
287 | ||
288 | static int tegra_pcie_write_conf(struct pci_bus *bus, unsigned int devfn, | |
289 | int where, int size, u32 val) | |
290 | { | |
291 | struct tegra_pcie_port *pp = bus_to_port(bus->number); | |
292 | void __iomem *addr; | |
293 | ||
294 | u32 mask; | |
295 | u32 tmp; | |
296 | ||
297 | if (pp) { | |
298 | if (devfn != 0) | |
299 | return PCIBIOS_DEVICE_NOT_FOUND; | |
300 | ||
301 | addr = pp->base + (where & ~0x3); | |
302 | } else { | |
303 | addr = tegra_pcie.regs + (PCIE_CONF_BUS(bus->number) + | |
304 | PCIE_CONF_DEV(PCI_SLOT(devfn)) + | |
305 | PCIE_CONF_FUNC(PCI_FUNC(devfn)) + | |
306 | PCIE_CONF_REG(where)); | |
307 | } | |
308 | ||
309 | if (size == 4) { | |
310 | writel(val, addr); | |
311 | return PCIBIOS_SUCCESSFUL; | |
312 | } | |
313 | ||
314 | if (size == 2) | |
315 | mask = ~(0xffff << ((where & 0x3) * 8)); | |
316 | else if (size == 1) | |
317 | mask = ~(0xff << ((where & 0x3) * 8)); | |
318 | else | |
319 | return PCIBIOS_BAD_REGISTER_NUMBER; | |
320 | ||
321 | tmp = readl(addr) & mask; | |
322 | tmp |= val << ((where & 0x3) * 8); | |
323 | writel(tmp, addr); | |
324 | ||
325 | return PCIBIOS_SUCCESSFUL; | |
326 | } | |
327 | ||
328 | static struct pci_ops tegra_pcie_ops = { | |
329 | .read = tegra_pcie_read_conf, | |
330 | .write = tegra_pcie_write_conf, | |
331 | }; | |
332 | ||
351a102d | 333 | static void tegra_pcie_fixup_bridge(struct pci_dev *dev) |
77ffc146 MR |
334 | { |
335 | u16 reg; | |
336 | ||
337 | if ((dev->class >> 16) == PCI_BASE_CLASS_BRIDGE) { | |
338 | pci_read_config_word(dev, PCI_COMMAND, ®); | |
339 | reg |= (PCI_COMMAND_IO | PCI_COMMAND_MEMORY | | |
340 | PCI_COMMAND_MASTER | PCI_COMMAND_SERR); | |
341 | pci_write_config_word(dev, PCI_COMMAND, reg); | |
342 | } | |
343 | } | |
344 | DECLARE_PCI_FIXUP_FINAL(PCI_ANY_ID, PCI_ANY_ID, tegra_pcie_fixup_bridge); | |
345 | ||
346 | /* Tegra PCIE root complex wrongly reports device class */ | |
351a102d | 347 | static void tegra_pcie_fixup_class(struct pci_dev *dev) |
77ffc146 MR |
348 | { |
349 | dev->class = PCI_CLASS_BRIDGE_PCI << 8; | |
350 | } | |
351 | DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_NVIDIA, 0x0bf0, tegra_pcie_fixup_class); | |
352 | DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_NVIDIA, 0x0bf1, tegra_pcie_fixup_class); | |
353 | ||
354 | /* Tegra PCIE requires relaxed ordering */ | |
351a102d | 355 | static void tegra_pcie_relax_enable(struct pci_dev *dev) |
77ffc146 | 356 | { |
3b87011d | 357 | pcie_capability_set_word(dev, PCI_EXP_DEVCTL, PCI_EXP_DEVCTL_RELAX_EN); |
77ffc146 MR |
358 | } |
359 | DECLARE_PCI_FIXUP_FINAL(PCI_ANY_ID, PCI_ANY_ID, tegra_pcie_relax_enable); | |
360 | ||
361 | static int tegra_pcie_setup(int nr, struct pci_sys_data *sys) | |
362 | { | |
363 | struct tegra_pcie_port *pp; | |
364 | ||
365 | if (nr >= tegra_pcie.num_ports) | |
366 | return 0; | |
367 | ||
368 | pp = tegra_pcie.port + nr; | |
369 | pp->root_bus_nr = sys->busnr; | |
370 | ||
d94c7a04 | 371 | pci_ioremap_io(nr * SZ_64K, TEGRA_PCIE_IO_BASE); |
77ffc146 MR |
372 | |
373 | /* | |
374 | * IORESOURCE_MEM | |
375 | */ | |
376 | snprintf(pp->mem_space_name, sizeof(pp->mem_space_name), | |
377 | "PCIe %d MEM", pp->index); | |
378 | pp->mem_space_name[sizeof(pp->mem_space_name) - 1] = 0; | |
d94c7a04 | 379 | pp->res[0].name = pp->mem_space_name; |
77ffc146 | 380 | if (pp->index == 0) { |
d94c7a04 RH |
381 | pp->res[0].start = MEM_BASE_0; |
382 | pp->res[0].end = pp->res[0].start + MEM_SIZE_0 - 1; | |
77ffc146 | 383 | } else { |
d94c7a04 RH |
384 | pp->res[0].start = MEM_BASE_1; |
385 | pp->res[0].end = pp->res[0].start + MEM_SIZE_1 - 1; | |
77ffc146 | 386 | } |
d94c7a04 RH |
387 | pp->res[0].flags = IORESOURCE_MEM; |
388 | if (request_resource(&iomem_resource, &pp->res[0])) | |
77ffc146 | 389 | panic("Request PCIe Memory resource failed\n"); |
d94c7a04 | 390 | pci_add_resource_offset(&sys->resources, &pp->res[0], sys->mem_offset); |
77ffc146 MR |
391 | |
392 | /* | |
393 | * IORESOURCE_MEM | IORESOURCE_PREFETCH | |
394 | */ | |
395 | snprintf(pp->prefetch_space_name, sizeof(pp->prefetch_space_name), | |
396 | "PCIe %d PREFETCH MEM", pp->index); | |
397 | pp->prefetch_space_name[sizeof(pp->prefetch_space_name) - 1] = 0; | |
d94c7a04 | 398 | pp->res[1].name = pp->prefetch_space_name; |
77ffc146 | 399 | if (pp->index == 0) { |
d94c7a04 RH |
400 | pp->res[1].start = PREFETCH_MEM_BASE_0; |
401 | pp->res[1].end = pp->res[1].start + PREFETCH_MEM_SIZE_0 - 1; | |
77ffc146 | 402 | } else { |
d94c7a04 RH |
403 | pp->res[1].start = PREFETCH_MEM_BASE_1; |
404 | pp->res[1].end = pp->res[1].start + PREFETCH_MEM_SIZE_1 - 1; | |
77ffc146 | 405 | } |
d94c7a04 RH |
406 | pp->res[1].flags = IORESOURCE_MEM | IORESOURCE_PREFETCH; |
407 | if (request_resource(&iomem_resource, &pp->res[1])) | |
77ffc146 | 408 | panic("Request PCIe Prefetch Memory resource failed\n"); |
d94c7a04 | 409 | pci_add_resource_offset(&sys->resources, &pp->res[1], sys->mem_offset); |
77ffc146 MR |
410 | |
411 | return 1; | |
412 | } | |
413 | ||
d5341942 | 414 | static int tegra_pcie_map_irq(const struct pci_dev *dev, u8 slot, u8 pin) |
77ffc146 MR |
415 | { |
416 | return INT_PCIE_INTR; | |
417 | } | |
418 | ||
419 | static struct pci_bus __init *tegra_pcie_scan_bus(int nr, | |
420 | struct pci_sys_data *sys) | |
421 | { | |
422 | struct tegra_pcie_port *pp; | |
423 | ||
424 | if (nr >= tegra_pcie.num_ports) | |
31e66068 | 425 | return NULL; |
77ffc146 MR |
426 | |
427 | pp = tegra_pcie.port + nr; | |
428 | pp->root_bus_nr = sys->busnr; | |
429 | ||
37d15909 BH |
430 | return pci_scan_root_bus(NULL, sys->busnr, &tegra_pcie_ops, sys, |
431 | &sys->resources); | |
77ffc146 MR |
432 | } |
433 | ||
434 | static struct hw_pci tegra_pcie_hw __initdata = { | |
435 | .nr_controllers = 2, | |
436 | .setup = tegra_pcie_setup, | |
437 | .scan = tegra_pcie_scan_bus, | |
77ffc146 MR |
438 | .map_irq = tegra_pcie_map_irq, |
439 | }; | |
440 | ||
441 | ||
442 | static irqreturn_t tegra_pcie_isr(int irq, void *arg) | |
443 | { | |
444 | const char *err_msg[] = { | |
445 | "Unknown", | |
446 | "AXI slave error", | |
447 | "AXI decode error", | |
448 | "Target abort", | |
449 | "Master abort", | |
450 | "Invalid write", | |
451 | "Response decoding error", | |
452 | "AXI response decoding error", | |
453 | "Transcation timeout", | |
454 | }; | |
455 | ||
456 | u32 code, signature; | |
457 | ||
458 | code = afi_readl(AFI_INTR_CODE) & AFI_INTR_CODE_MASK; | |
459 | signature = afi_readl(AFI_INTR_SIGNATURE); | |
460 | afi_writel(0, AFI_INTR_CODE); | |
461 | ||
462 | if (code == AFI_INTR_LEGACY) | |
463 | return IRQ_NONE; | |
464 | ||
465 | if (code >= ARRAY_SIZE(err_msg)) | |
466 | code = 0; | |
467 | ||
468 | /* | |
469 | * do not pollute kernel log with master abort reports since they | |
470 | * happen a lot during enumeration | |
471 | */ | |
472 | if (code == AFI_INTR_MASTER_ABORT) | |
473 | pr_debug("PCIE: %s, signature: %08x\n", err_msg[code], signature); | |
474 | else | |
475 | pr_err("PCIE: %s, signature: %08x\n", err_msg[code], signature); | |
476 | ||
477 | return IRQ_HANDLED; | |
478 | } | |
479 | ||
480 | static void tegra_pcie_setup_translations(void) | |
481 | { | |
482 | u32 fpci_bar; | |
483 | u32 size; | |
484 | u32 axi_address; | |
485 | ||
486 | /* Bar 0: config Bar */ | |
487 | fpci_bar = ((u32)0xfdff << 16); | |
488 | size = PCIE_CFG_SZ; | |
489 | axi_address = TEGRA_PCIE_BASE + PCIE_CFG_OFF; | |
490 | afi_writel(axi_address, AFI_AXI_BAR0_START); | |
491 | afi_writel(size >> 12, AFI_AXI_BAR0_SZ); | |
492 | afi_writel(fpci_bar, AFI_FPCI_BAR0); | |
493 | ||
494 | /* Bar 1: extended config Bar */ | |
495 | fpci_bar = ((u32)0xfe1 << 20); | |
496 | size = PCIE_EXT_CFG_SZ; | |
497 | axi_address = TEGRA_PCIE_BASE + PCIE_EXT_CFG_OFF; | |
498 | afi_writel(axi_address, AFI_AXI_BAR1_START); | |
499 | afi_writel(size >> 12, AFI_AXI_BAR1_SZ); | |
500 | afi_writel(fpci_bar, AFI_FPCI_BAR1); | |
501 | ||
502 | /* Bar 2: downstream IO bar */ | |
503 | fpci_bar = ((__u32)0xfdfc << 16); | |
d94c7a04 RH |
504 | size = SZ_128K; |
505 | axi_address = TEGRA_PCIE_IO_BASE; | |
77ffc146 MR |
506 | afi_writel(axi_address, AFI_AXI_BAR2_START); |
507 | afi_writel(size >> 12, AFI_AXI_BAR2_SZ); | |
508 | afi_writel(fpci_bar, AFI_FPCI_BAR2); | |
509 | ||
510 | /* Bar 3: prefetchable memory BAR */ | |
511 | fpci_bar = (((PREFETCH_MEM_BASE_0 >> 12) & 0x0fffffff) << 4) | 0x1; | |
512 | size = PREFETCH_MEM_SIZE_0 + PREFETCH_MEM_SIZE_1; | |
513 | axi_address = PREFETCH_MEM_BASE_0; | |
514 | afi_writel(axi_address, AFI_AXI_BAR3_START); | |
515 | afi_writel(size >> 12, AFI_AXI_BAR3_SZ); | |
516 | afi_writel(fpci_bar, AFI_FPCI_BAR3); | |
517 | ||
518 | /* Bar 4: non prefetchable memory BAR */ | |
519 | fpci_bar = (((MEM_BASE_0 >> 12) & 0x0FFFFFFF) << 4) | 0x1; | |
520 | size = MEM_SIZE_0 + MEM_SIZE_1; | |
521 | axi_address = MEM_BASE_0; | |
522 | afi_writel(axi_address, AFI_AXI_BAR4_START); | |
523 | afi_writel(size >> 12, AFI_AXI_BAR4_SZ); | |
524 | afi_writel(fpci_bar, AFI_FPCI_BAR4); | |
525 | ||
526 | /* Bar 5: NULL out the remaining BAR as it is not used */ | |
527 | fpci_bar = 0; | |
528 | size = 0; | |
529 | axi_address = 0; | |
530 | afi_writel(axi_address, AFI_AXI_BAR5_START); | |
531 | afi_writel(size >> 12, AFI_AXI_BAR5_SZ); | |
532 | afi_writel(fpci_bar, AFI_FPCI_BAR5); | |
533 | ||
534 | /* map all upstream transactions as uncached */ | |
535 | afi_writel(PHYS_OFFSET, AFI_CACHE_BAR0_ST); | |
536 | afi_writel(0, AFI_CACHE_BAR0_SZ); | |
537 | afi_writel(0, AFI_CACHE_BAR1_ST); | |
538 | afi_writel(0, AFI_CACHE_BAR1_SZ); | |
539 | ||
540 | /* No MSI */ | |
541 | afi_writel(0, AFI_MSI_FPCI_BAR_ST); | |
542 | afi_writel(0, AFI_MSI_BAR_SZ); | |
543 | afi_writel(0, AFI_MSI_AXI_BAR_ST); | |
544 | afi_writel(0, AFI_MSI_BAR_SZ); | |
545 | } | |
546 | ||
795d5fd4 | 547 | static int tegra_pcie_enable_controller(void) |
77ffc146 MR |
548 | { |
549 | u32 val, reg; | |
795d5fd4 | 550 | int i, timeout; |
77ffc146 MR |
551 | |
552 | /* Enable slot clock and pulse the reset signals */ | |
553 | for (i = 0, reg = AFI_PEX0_CTRL; i < 2; i++, reg += 0x8) { | |
554 | val = afi_readl(reg) | AFI_PEX_CTRL_REFCLK_EN; | |
555 | afi_writel(val, reg); | |
556 | val &= ~AFI_PEX_CTRL_RST; | |
557 | afi_writel(val, reg); | |
558 | ||
559 | val = afi_readl(reg) | AFI_PEX_CTRL_RST; | |
560 | afi_writel(val, reg); | |
561 | } | |
562 | ||
563 | /* Enable dual controller and both ports */ | |
564 | val = afi_readl(AFI_PCIE_CONFIG); | |
565 | val &= ~(AFI_PCIE_CONFIG_PCIEC0_DISABLE_DEVICE | | |
566 | AFI_PCIE_CONFIG_PCIEC1_DISABLE_DEVICE | | |
567 | AFI_PCIE_CONFIG_SM2TMS0_XBAR_CONFIG_MASK); | |
568 | val |= AFI_PCIE_CONFIG_SM2TMS0_XBAR_CONFIG_DUAL; | |
569 | afi_writel(val, AFI_PCIE_CONFIG); | |
570 | ||
571 | val = afi_readl(AFI_FUSE) & ~AFI_FUSE_PCIE_T0_GEN2_DIS; | |
572 | afi_writel(val, AFI_FUSE); | |
573 | ||
574 | /* Initialze internal PHY, enable up to 16 PCIE lanes */ | |
575 | pads_writel(0x0, PADS_CTL_SEL); | |
576 | ||
577 | /* override IDDQ to 1 on all 4 lanes */ | |
578 | val = pads_readl(PADS_CTL) | PADS_CTL_IDDQ_1L; | |
579 | pads_writel(val, PADS_CTL); | |
580 | ||
581 | /* | |
582 | * set up PHY PLL inputs select PLLE output as refclock, | |
583 | * set TX ref sel to div10 (not div5) | |
584 | */ | |
585 | val = pads_readl(PADS_PLL_CTL); | |
586 | val &= ~(PADS_PLL_CTL_REFCLK_MASK | PADS_PLL_CTL_TXCLKREF_MASK); | |
587 | val |= (PADS_PLL_CTL_REFCLK_INTERNAL_CML | PADS_PLL_CTL_TXCLKREF_DIV10); | |
588 | pads_writel(val, PADS_PLL_CTL); | |
589 | ||
590 | /* take PLL out of reset */ | |
591 | val = pads_readl(PADS_PLL_CTL) | PADS_PLL_CTL_RST_B4SM; | |
592 | pads_writel(val, PADS_PLL_CTL); | |
593 | ||
594 | /* | |
595 | * Hack, set the clock voltage to the DEFAULT provided by hw folks. | |
596 | * This doesn't exist in the documentation | |
597 | */ | |
598 | pads_writel(0xfa5cfa5c, 0xc8); | |
599 | ||
600 | /* Wait for the PLL to lock */ | |
2f926eec | 601 | timeout = 300; |
77ffc146 MR |
602 | do { |
603 | val = pads_readl(PADS_PLL_CTL); | |
2f926eec | 604 | usleep_range(1000, 1000); |
795d5fd4 DA |
605 | if (--timeout == 0) { |
606 | pr_err("Tegra PCIe error: timeout waiting for PLL\n"); | |
607 | return -EBUSY; | |
608 | } | |
77ffc146 MR |
609 | } while (!(val & PADS_PLL_CTL_LOCKDET)); |
610 | ||
611 | /* turn off IDDQ override */ | |
612 | val = pads_readl(PADS_CTL) & ~PADS_CTL_IDDQ_1L; | |
613 | pads_writel(val, PADS_CTL); | |
614 | ||
615 | /* enable TX/RX data */ | |
616 | val = pads_readl(PADS_CTL); | |
617 | val |= (PADS_CTL_TX_DATA_EN_1L | PADS_CTL_RX_DATA_EN_1L); | |
618 | pads_writel(val, PADS_CTL); | |
619 | ||
620 | /* Take the PCIe interface module out of reset */ | |
621 | tegra_periph_reset_deassert(tegra_pcie.pcie_xclk); | |
622 | ||
623 | /* Finally enable PCIe */ | |
624 | val = afi_readl(AFI_CONFIGURATION) | AFI_CONFIGURATION_EN_FPCI; | |
625 | afi_writel(val, AFI_CONFIGURATION); | |
626 | ||
627 | val = (AFI_INTR_EN_INI_SLVERR | AFI_INTR_EN_INI_DECERR | | |
628 | AFI_INTR_EN_TGT_SLVERR | AFI_INTR_EN_TGT_DECERR | | |
629 | AFI_INTR_EN_TGT_WRERR | AFI_INTR_EN_DFPCI_DECERR); | |
630 | afi_writel(val, AFI_AFI_INTR_ENABLE); | |
631 | afi_writel(0xffffffff, AFI_SM_INTR_ENABLE); | |
632 | ||
633 | /* FIXME: No MSI for now, only INT */ | |
634 | afi_writel(AFI_INTR_MASK_INT_MASK, AFI_INTR_MASK); | |
635 | ||
636 | /* Disable all execptions */ | |
637 | afi_writel(0, AFI_FPCI_ERROR_MASKS); | |
638 | ||
2f926eec | 639 | return 0; |
77ffc146 MR |
640 | } |
641 | ||
642 | static void tegra_pcie_xclk_clamp(bool clamp) | |
643 | { | |
644 | u32 reg; | |
645 | ||
646 | reg = pmc_readl(PMC_SCRATCH42) & ~PMC_SCRATCH42_PCX_CLAMP; | |
647 | ||
648 | if (clamp) | |
649 | reg |= PMC_SCRATCH42_PCX_CLAMP; | |
650 | ||
651 | pmc_writel(reg, PMC_SCRATCH42); | |
652 | } | |
653 | ||
1e40a97e MR |
654 | static void tegra_pcie_power_off(void) |
655 | { | |
656 | tegra_periph_reset_assert(tegra_pcie.pcie_xclk); | |
657 | tegra_periph_reset_assert(tegra_pcie.afi_clk); | |
658 | tegra_periph_reset_assert(tegra_pcie.pex_clk); | |
659 | ||
b96cc7fe | 660 | tegra_powergate_power_off(TEGRA_POWERGATE_PCIE); |
1e40a97e MR |
661 | tegra_pcie_xclk_clamp(true); |
662 | } | |
663 | ||
b96cc7fe | 664 | static int tegra_pcie_power_regate(void) |
77ffc146 | 665 | { |
b96cc7fe MR |
666 | int err; |
667 | ||
668 | tegra_pcie_power_off(); | |
669 | ||
77ffc146 | 670 | tegra_pcie_xclk_clamp(true); |
b96cc7fe | 671 | |
77ffc146 | 672 | tegra_periph_reset_assert(tegra_pcie.pcie_xclk); |
b96cc7fe MR |
673 | tegra_periph_reset_assert(tegra_pcie.afi_clk); |
674 | ||
675 | err = tegra_powergate_sequence_power_up(TEGRA_POWERGATE_PCIE, | |
676 | tegra_pcie.pex_clk); | |
677 | if (err) { | |
678 | pr_err("PCIE: powerup sequence failed: %d\n", err); | |
679 | return err; | |
680 | } | |
681 | ||
682 | tegra_periph_reset_deassert(tegra_pcie.afi_clk); | |
683 | ||
77ffc146 MR |
684 | tegra_pcie_xclk_clamp(false); |
685 | ||
6a5278d0 PG |
686 | clk_prepare_enable(tegra_pcie.afi_clk); |
687 | clk_prepare_enable(tegra_pcie.pex_clk); | |
688 | return clk_prepare_enable(tegra_pcie.pll_e); | |
77ffc146 MR |
689 | } |
690 | ||
77ffc146 MR |
691 | static int tegra_pcie_clocks_get(void) |
692 | { | |
693 | int err; | |
694 | ||
695 | tegra_pcie.pex_clk = clk_get(NULL, "pex"); | |
696 | if (IS_ERR(tegra_pcie.pex_clk)) | |
697 | return PTR_ERR(tegra_pcie.pex_clk); | |
698 | ||
699 | tegra_pcie.afi_clk = clk_get(NULL, "afi"); | |
700 | if (IS_ERR(tegra_pcie.afi_clk)) { | |
701 | err = PTR_ERR(tegra_pcie.afi_clk); | |
702 | goto err_afi_clk; | |
703 | } | |
704 | ||
705 | tegra_pcie.pcie_xclk = clk_get(NULL, "pcie_xclk"); | |
706 | if (IS_ERR(tegra_pcie.pcie_xclk)) { | |
707 | err = PTR_ERR(tegra_pcie.pcie_xclk); | |
708 | goto err_pcie_xclk; | |
709 | } | |
710 | ||
711 | tegra_pcie.pll_e = clk_get_sys(NULL, "pll_e"); | |
712 | if (IS_ERR(tegra_pcie.pll_e)) { | |
713 | err = PTR_ERR(tegra_pcie.pll_e); | |
714 | goto err_pll_e; | |
715 | } | |
716 | ||
717 | return 0; | |
718 | ||
719 | err_pll_e: | |
720 | clk_put(tegra_pcie.pcie_xclk); | |
721 | err_pcie_xclk: | |
722 | clk_put(tegra_pcie.afi_clk); | |
723 | err_afi_clk: | |
724 | clk_put(tegra_pcie.pex_clk); | |
725 | ||
726 | return err; | |
727 | } | |
728 | ||
729 | static void tegra_pcie_clocks_put(void) | |
730 | { | |
731 | clk_put(tegra_pcie.pll_e); | |
732 | clk_put(tegra_pcie.pcie_xclk); | |
733 | clk_put(tegra_pcie.afi_clk); | |
734 | clk_put(tegra_pcie.pex_clk); | |
735 | } | |
736 | ||
737 | static int __init tegra_pcie_get_resources(void) | |
738 | { | |
77ffc146 MR |
739 | int err; |
740 | ||
741 | err = tegra_pcie_clocks_get(); | |
742 | if (err) { | |
743 | pr_err("PCIE: failed to get clocks: %d\n", err); | |
744 | return err; | |
745 | } | |
746 | ||
b96cc7fe | 747 | err = tegra_pcie_power_regate(); |
77ffc146 MR |
748 | if (err) { |
749 | pr_err("PCIE: failed to power up: %d\n", err); | |
750 | goto err_pwr_on; | |
751 | } | |
752 | ||
753 | tegra_pcie.regs = ioremap_nocache(TEGRA_PCIE_BASE, PCIE_IOMAP_SZ); | |
754 | if (tegra_pcie.regs == NULL) { | |
755 | pr_err("PCIE: Failed to map PCI/AFI registers\n"); | |
756 | err = -ENOMEM; | |
757 | goto err_map_reg; | |
758 | } | |
759 | ||
77ffc146 MR |
760 | err = request_irq(INT_PCIE_INTR, tegra_pcie_isr, |
761 | IRQF_SHARED, "PCIE", &tegra_pcie); | |
762 | if (err) { | |
763 | pr_err("PCIE: Failed to register IRQ: %d\n", err); | |
d94c7a04 | 764 | goto err_req_io; |
77ffc146 MR |
765 | } |
766 | set_irq_flags(INT_PCIE_INTR, IRQF_VALID); | |
767 | ||
768 | return 0; | |
769 | ||
77ffc146 MR |
770 | err_req_io: |
771 | iounmap(tegra_pcie.regs); | |
772 | err_map_reg: | |
773 | tegra_pcie_power_off(); | |
774 | err_pwr_on: | |
775 | tegra_pcie_clocks_put(); | |
776 | ||
777 | return err; | |
778 | } | |
779 | ||
780 | /* | |
781 | * FIXME: If there are no PCIe cards attached, then calling this function | |
782 | * can result in the increase of the bootup time as there are big timeout | |
783 | * loops. | |
784 | */ | |
785 | #define TEGRA_PCIE_LINKUP_TIMEOUT 200 /* up to 1.2 seconds */ | |
786 | static bool tegra_pcie_check_link(struct tegra_pcie_port *pp, int idx, | |
787 | u32 reset_reg) | |
788 | { | |
789 | u32 reg; | |
790 | int retries = 3; | |
791 | int timeout; | |
792 | ||
793 | do { | |
794 | timeout = TEGRA_PCIE_LINKUP_TIMEOUT; | |
795 | while (timeout) { | |
796 | reg = readl(pp->base + RP_VEND_XP); | |
797 | ||
798 | if (reg & RP_VEND_XP_DL_UP) | |
799 | break; | |
800 | ||
801 | mdelay(1); | |
802 | timeout--; | |
803 | } | |
804 | ||
805 | if (!timeout) { | |
806 | pr_err("PCIE: port %d: link down, retrying\n", idx); | |
807 | goto retry; | |
808 | } | |
809 | ||
810 | timeout = TEGRA_PCIE_LINKUP_TIMEOUT; | |
811 | while (timeout) { | |
812 | reg = readl(pp->base + RP_LINK_CONTROL_STATUS); | |
813 | ||
814 | if (reg & 0x20000000) | |
815 | return true; | |
816 | ||
817 | mdelay(1); | |
818 | timeout--; | |
819 | } | |
820 | ||
821 | retry: | |
822 | /* Pulse the PEX reset */ | |
823 | reg = afi_readl(reset_reg) | AFI_PEX_CTRL_RST; | |
824 | afi_writel(reg, reset_reg); | |
825 | mdelay(1); | |
826 | reg = afi_readl(reset_reg) & ~AFI_PEX_CTRL_RST; | |
827 | afi_writel(reg, reset_reg); | |
828 | ||
829 | retries--; | |
830 | } while (retries); | |
831 | ||
832 | return false; | |
833 | } | |
834 | ||
835 | static void __init tegra_pcie_add_port(int index, u32 offset, u32 reset_reg) | |
836 | { | |
837 | struct tegra_pcie_port *pp; | |
838 | ||
839 | pp = tegra_pcie.port + tegra_pcie.num_ports; | |
840 | ||
841 | pp->index = -1; | |
842 | pp->base = tegra_pcie.regs + offset; | |
843 | pp->link_up = tegra_pcie_check_link(pp, index, reset_reg); | |
844 | ||
845 | if (!pp->link_up) { | |
846 | pp->base = NULL; | |
847 | printk(KERN_INFO "PCIE: port %d: link down, ignoring\n", index); | |
848 | return; | |
849 | } | |
850 | ||
851 | tegra_pcie.num_ports++; | |
852 | pp->index = index; | |
853 | pp->root_bus_nr = -1; | |
854 | memset(pp->res, 0, sizeof(pp->res)); | |
855 | } | |
856 | ||
857 | int __init tegra_pcie_init(bool init_port0, bool init_port1) | |
858 | { | |
859 | int err; | |
860 | ||
861 | if (!(init_port0 || init_port1)) | |
862 | return -ENODEV; | |
863 | ||
c9d95fbe RH |
864 | pcibios_min_mem = 0; |
865 | ||
77ffc146 MR |
866 | err = tegra_pcie_get_resources(); |
867 | if (err) | |
868 | return err; | |
869 | ||
795d5fd4 DA |
870 | err = tegra_pcie_enable_controller(); |
871 | if (err) | |
872 | return err; | |
77ffc146 MR |
873 | |
874 | /* setup the AFI address translations */ | |
875 | tegra_pcie_setup_translations(); | |
876 | ||
877 | if (init_port0) | |
878 | tegra_pcie_add_port(0, RP0_OFFSET, AFI_PEX0_CTRL); | |
879 | ||
880 | if (init_port1) | |
881 | tegra_pcie_add_port(1, RP1_OFFSET, AFI_PEX1_CTRL); | |
882 | ||
883 | pci_common_init(&tegra_pcie_hw); | |
884 | ||
885 | return 0; | |
886 | } |