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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> |
77ffc146 MR |
36 | |
37 | #include <asm/sizes.h> | |
38 | #include <asm/mach/pci.h> | |
39 | ||
77ffc146 | 40 | #include <mach/clk.h> |
b96cc7fe | 41 | #include <mach/powergate.h> |
77ffc146 | 42 | |
3ead5137 | 43 | #include "board.h" |
2be39c07 | 44 | #include "iomap.h" |
3ead5137 | 45 | |
c5a4d6b0 SW |
46 | /* Hack - need to parse this from DT */ |
47 | #define INT_PCIE_INTR 130 | |
48 | ||
77ffc146 MR |
49 | /* register definitions */ |
50 | #define AFI_OFFSET 0x3800 | |
51 | #define PADS_OFFSET 0x3000 | |
52 | #define RP0_OFFSET 0x0000 | |
53 | #define RP1_OFFSET 0x1000 | |
54 | ||
55 | #define AFI_AXI_BAR0_SZ 0x00 | |
56 | #define AFI_AXI_BAR1_SZ 0x04 | |
57 | #define AFI_AXI_BAR2_SZ 0x08 | |
58 | #define AFI_AXI_BAR3_SZ 0x0c | |
59 | #define AFI_AXI_BAR4_SZ 0x10 | |
60 | #define AFI_AXI_BAR5_SZ 0x14 | |
61 | ||
62 | #define AFI_AXI_BAR0_START 0x18 | |
63 | #define AFI_AXI_BAR1_START 0x1c | |
64 | #define AFI_AXI_BAR2_START 0x20 | |
65 | #define AFI_AXI_BAR3_START 0x24 | |
66 | #define AFI_AXI_BAR4_START 0x28 | |
67 | #define AFI_AXI_BAR5_START 0x2c | |
68 | ||
69 | #define AFI_FPCI_BAR0 0x30 | |
70 | #define AFI_FPCI_BAR1 0x34 | |
71 | #define AFI_FPCI_BAR2 0x38 | |
72 | #define AFI_FPCI_BAR3 0x3c | |
73 | #define AFI_FPCI_BAR4 0x40 | |
74 | #define AFI_FPCI_BAR5 0x44 | |
75 | ||
76 | #define AFI_CACHE_BAR0_SZ 0x48 | |
77 | #define AFI_CACHE_BAR0_ST 0x4c | |
78 | #define AFI_CACHE_BAR1_SZ 0x50 | |
79 | #define AFI_CACHE_BAR1_ST 0x54 | |
80 | ||
81 | #define AFI_MSI_BAR_SZ 0x60 | |
82 | #define AFI_MSI_FPCI_BAR_ST 0x64 | |
83 | #define AFI_MSI_AXI_BAR_ST 0x68 | |
84 | ||
85 | #define AFI_CONFIGURATION 0xac | |
86 | #define AFI_CONFIGURATION_EN_FPCI (1 << 0) | |
87 | ||
88 | #define AFI_FPCI_ERROR_MASKS 0xb0 | |
89 | ||
90 | #define AFI_INTR_MASK 0xb4 | |
91 | #define AFI_INTR_MASK_INT_MASK (1 << 0) | |
92 | #define AFI_INTR_MASK_MSI_MASK (1 << 8) | |
93 | ||
94 | #define AFI_INTR_CODE 0xb8 | |
95 | #define AFI_INTR_CODE_MASK 0xf | |
96 | #define AFI_INTR_MASTER_ABORT 4 | |
97 | #define AFI_INTR_LEGACY 6 | |
98 | ||
99 | #define AFI_INTR_SIGNATURE 0xbc | |
100 | #define AFI_SM_INTR_ENABLE 0xc4 | |
101 | ||
102 | #define AFI_AFI_INTR_ENABLE 0xc8 | |
103 | #define AFI_INTR_EN_INI_SLVERR (1 << 0) | |
104 | #define AFI_INTR_EN_INI_DECERR (1 << 1) | |
105 | #define AFI_INTR_EN_TGT_SLVERR (1 << 2) | |
106 | #define AFI_INTR_EN_TGT_DECERR (1 << 3) | |
107 | #define AFI_INTR_EN_TGT_WRERR (1 << 4) | |
108 | #define AFI_INTR_EN_DFPCI_DECERR (1 << 5) | |
109 | #define AFI_INTR_EN_AXI_DECERR (1 << 6) | |
110 | #define AFI_INTR_EN_FPCI_TIMEOUT (1 << 7) | |
111 | ||
112 | #define AFI_PCIE_CONFIG 0x0f8 | |
113 | #define AFI_PCIE_CONFIG_PCIEC0_DISABLE_DEVICE (1 << 1) | |
114 | #define AFI_PCIE_CONFIG_PCIEC1_DISABLE_DEVICE (1 << 2) | |
115 | #define AFI_PCIE_CONFIG_SM2TMS0_XBAR_CONFIG_MASK (0xf << 20) | |
116 | #define AFI_PCIE_CONFIG_SM2TMS0_XBAR_CONFIG_SINGLE (0x0 << 20) | |
117 | #define AFI_PCIE_CONFIG_SM2TMS0_XBAR_CONFIG_DUAL (0x1 << 20) | |
118 | ||
119 | #define AFI_FUSE 0x104 | |
120 | #define AFI_FUSE_PCIE_T0_GEN2_DIS (1 << 2) | |
121 | ||
122 | #define AFI_PEX0_CTRL 0x110 | |
123 | #define AFI_PEX1_CTRL 0x118 | |
124 | #define AFI_PEX_CTRL_RST (1 << 0) | |
125 | #define AFI_PEX_CTRL_REFCLK_EN (1 << 3) | |
126 | ||
127 | #define RP_VEND_XP 0x00000F00 | |
128 | #define RP_VEND_XP_DL_UP (1 << 30) | |
129 | ||
130 | #define RP_LINK_CONTROL_STATUS 0x00000090 | |
131 | #define RP_LINK_CONTROL_STATUS_LINKSTAT_MASK 0x3fff0000 | |
132 | ||
133 | #define PADS_CTL_SEL 0x0000009C | |
134 | ||
135 | #define PADS_CTL 0x000000A0 | |
136 | #define PADS_CTL_IDDQ_1L (1 << 0) | |
137 | #define PADS_CTL_TX_DATA_EN_1L (1 << 6) | |
138 | #define PADS_CTL_RX_DATA_EN_1L (1 << 10) | |
139 | ||
140 | #define PADS_PLL_CTL 0x000000B8 | |
141 | #define PADS_PLL_CTL_RST_B4SM (1 << 1) | |
142 | #define PADS_PLL_CTL_LOCKDET (1 << 8) | |
143 | #define PADS_PLL_CTL_REFCLK_MASK (0x3 << 16) | |
144 | #define PADS_PLL_CTL_REFCLK_INTERNAL_CML (0 << 16) | |
145 | #define PADS_PLL_CTL_REFCLK_INTERNAL_CMOS (1 << 16) | |
146 | #define PADS_PLL_CTL_REFCLK_EXTERNAL (2 << 16) | |
147 | #define PADS_PLL_CTL_TXCLKREF_MASK (0x1 << 20) | |
148 | #define PADS_PLL_CTL_TXCLKREF_DIV10 (0 << 20) | |
149 | #define PADS_PLL_CTL_TXCLKREF_DIV5 (1 << 20) | |
150 | ||
151 | /* PMC access is required for PCIE xclk (un)clamping */ | |
152 | #define PMC_SCRATCH42 0x144 | |
153 | #define PMC_SCRATCH42_PCX_CLAMP (1 << 0) | |
154 | ||
155 | static void __iomem *reg_pmc_base = IO_ADDRESS(TEGRA_PMC_BASE); | |
156 | ||
157 | #define pmc_writel(value, reg) \ | |
efaa19a5 | 158 | __raw_writel(value, reg_pmc_base + (reg)) |
77ffc146 | 159 | #define pmc_readl(reg) \ |
efaa19a5 | 160 | __raw_readl(reg_pmc_base + (reg)) |
77ffc146 MR |
161 | |
162 | /* | |
163 | * Tegra2 defines 1GB in the AXI address map for PCIe. | |
164 | * | |
165 | * That address space is split into different regions, with sizes and | |
166 | * offsets as follows: | |
167 | * | |
168 | * 0x80000000 - 0x80003fff - PCI controller registers | |
169 | * 0x80004000 - 0x80103fff - PCI configuration space | |
170 | * 0x80104000 - 0x80203fff - PCI extended configuration space | |
171 | * 0x80203fff - 0x803fffff - unused | |
172 | * 0x80400000 - 0x8040ffff - downstream IO | |
173 | * 0x80410000 - 0x8fffffff - unused | |
174 | * 0x90000000 - 0x9fffffff - non-prefetchable memory | |
175 | * 0xa0000000 - 0xbfffffff - prefetchable memory | |
176 | */ | |
77ffc146 MR |
177 | #define PCIE_REGS_SZ SZ_16K |
178 | #define PCIE_CFG_OFF PCIE_REGS_SZ | |
179 | #define PCIE_CFG_SZ SZ_1M | |
180 | #define PCIE_EXT_CFG_OFF (PCIE_CFG_SZ + PCIE_CFG_OFF) | |
181 | #define PCIE_EXT_CFG_SZ SZ_1M | |
182 | #define PCIE_IOMAP_SZ (PCIE_REGS_SZ + PCIE_CFG_SZ + PCIE_EXT_CFG_SZ) | |
183 | ||
77ffc146 MR |
184 | #define MEM_BASE_0 (TEGRA_PCIE_BASE + SZ_256M) |
185 | #define MEM_SIZE_0 SZ_128M | |
186 | #define MEM_BASE_1 (MEM_BASE_0 + MEM_SIZE_0) | |
187 | #define MEM_SIZE_1 SZ_128M | |
188 | #define PREFETCH_MEM_BASE_0 (MEM_BASE_1 + MEM_SIZE_1) | |
189 | #define PREFETCH_MEM_SIZE_0 SZ_128M | |
190 | #define PREFETCH_MEM_BASE_1 (PREFETCH_MEM_BASE_0 + PREFETCH_MEM_SIZE_0) | |
191 | #define PREFETCH_MEM_SIZE_1 SZ_128M | |
192 | ||
193 | #define PCIE_CONF_BUS(b) ((b) << 16) | |
194 | #define PCIE_CONF_DEV(d) ((d) << 11) | |
195 | #define PCIE_CONF_FUNC(f) ((f) << 8) | |
196 | #define PCIE_CONF_REG(r) \ | |
197 | (((r) & ~0x3) | (((r) < 256) ? PCIE_CFG_OFF : PCIE_EXT_CFG_OFF)) | |
198 | ||
199 | struct tegra_pcie_port { | |
200 | int index; | |
201 | u8 root_bus_nr; | |
202 | void __iomem *base; | |
203 | ||
204 | bool link_up; | |
205 | ||
77ffc146 MR |
206 | char mem_space_name[16]; |
207 | char prefetch_space_name[20]; | |
d94c7a04 | 208 | struct resource res[2]; |
77ffc146 MR |
209 | }; |
210 | ||
211 | struct tegra_pcie_info { | |
212 | struct tegra_pcie_port port[2]; | |
213 | int num_ports; | |
214 | ||
215 | void __iomem *regs; | |
216 | struct resource res_mmio; | |
217 | ||
218 | struct clk *pex_clk; | |
219 | struct clk *afi_clk; | |
220 | struct clk *pcie_xclk; | |
221 | struct clk *pll_e; | |
222 | }; | |
223 | ||
d94c7a04 | 224 | static struct tegra_pcie_info tegra_pcie; |
77ffc146 MR |
225 | |
226 | static inline void afi_writel(u32 value, unsigned long offset) | |
227 | { | |
228 | writel(value, offset + AFI_OFFSET + tegra_pcie.regs); | |
229 | } | |
230 | ||
231 | static inline u32 afi_readl(unsigned long offset) | |
232 | { | |
233 | return readl(offset + AFI_OFFSET + tegra_pcie.regs); | |
234 | } | |
235 | ||
236 | static inline void pads_writel(u32 value, unsigned long offset) | |
237 | { | |
238 | writel(value, offset + PADS_OFFSET + tegra_pcie.regs); | |
239 | } | |
240 | ||
241 | static inline u32 pads_readl(unsigned long offset) | |
242 | { | |
243 | return readl(offset + PADS_OFFSET + tegra_pcie.regs); | |
244 | } | |
245 | ||
246 | static struct tegra_pcie_port *bus_to_port(int bus) | |
247 | { | |
248 | int i; | |
249 | ||
250 | for (i = tegra_pcie.num_ports - 1; i >= 0; i--) { | |
251 | int rbus = tegra_pcie.port[i].root_bus_nr; | |
252 | if (rbus != -1 && rbus == bus) | |
253 | break; | |
254 | } | |
255 | ||
256 | return i >= 0 ? tegra_pcie.port + i : NULL; | |
257 | } | |
258 | ||
259 | static int tegra_pcie_read_conf(struct pci_bus *bus, unsigned int devfn, | |
260 | int where, int size, u32 *val) | |
261 | { | |
262 | struct tegra_pcie_port *pp = bus_to_port(bus->number); | |
263 | void __iomem *addr; | |
264 | ||
265 | if (pp) { | |
266 | if (devfn != 0) { | |
267 | *val = 0xffffffff; | |
268 | return PCIBIOS_DEVICE_NOT_FOUND; | |
269 | } | |
270 | ||
271 | addr = pp->base + (where & ~0x3); | |
272 | } else { | |
273 | addr = tegra_pcie.regs + (PCIE_CONF_BUS(bus->number) + | |
274 | PCIE_CONF_DEV(PCI_SLOT(devfn)) + | |
275 | PCIE_CONF_FUNC(PCI_FUNC(devfn)) + | |
276 | PCIE_CONF_REG(where)); | |
277 | } | |
278 | ||
279 | *val = readl(addr); | |
280 | ||
281 | if (size == 1) | |
282 | *val = (*val >> (8 * (where & 3))) & 0xff; | |
283 | else if (size == 2) | |
284 | *val = (*val >> (8 * (where & 3))) & 0xffff; | |
285 | ||
286 | return PCIBIOS_SUCCESSFUL; | |
287 | } | |
288 | ||
289 | static int tegra_pcie_write_conf(struct pci_bus *bus, unsigned int devfn, | |
290 | int where, int size, u32 val) | |
291 | { | |
292 | struct tegra_pcie_port *pp = bus_to_port(bus->number); | |
293 | void __iomem *addr; | |
294 | ||
295 | u32 mask; | |
296 | u32 tmp; | |
297 | ||
298 | if (pp) { | |
299 | if (devfn != 0) | |
300 | return PCIBIOS_DEVICE_NOT_FOUND; | |
301 | ||
302 | addr = pp->base + (where & ~0x3); | |
303 | } else { | |
304 | addr = tegra_pcie.regs + (PCIE_CONF_BUS(bus->number) + | |
305 | PCIE_CONF_DEV(PCI_SLOT(devfn)) + | |
306 | PCIE_CONF_FUNC(PCI_FUNC(devfn)) + | |
307 | PCIE_CONF_REG(where)); | |
308 | } | |
309 | ||
310 | if (size == 4) { | |
311 | writel(val, addr); | |
312 | return PCIBIOS_SUCCESSFUL; | |
313 | } | |
314 | ||
315 | if (size == 2) | |
316 | mask = ~(0xffff << ((where & 0x3) * 8)); | |
317 | else if (size == 1) | |
318 | mask = ~(0xff << ((where & 0x3) * 8)); | |
319 | else | |
320 | return PCIBIOS_BAD_REGISTER_NUMBER; | |
321 | ||
322 | tmp = readl(addr) & mask; | |
323 | tmp |= val << ((where & 0x3) * 8); | |
324 | writel(tmp, addr); | |
325 | ||
326 | return PCIBIOS_SUCCESSFUL; | |
327 | } | |
328 | ||
329 | static struct pci_ops tegra_pcie_ops = { | |
330 | .read = tegra_pcie_read_conf, | |
331 | .write = tegra_pcie_write_conf, | |
332 | }; | |
333 | ||
351a102d | 334 | static void tegra_pcie_fixup_bridge(struct pci_dev *dev) |
77ffc146 MR |
335 | { |
336 | u16 reg; | |
337 | ||
338 | if ((dev->class >> 16) == PCI_BASE_CLASS_BRIDGE) { | |
339 | pci_read_config_word(dev, PCI_COMMAND, ®); | |
340 | reg |= (PCI_COMMAND_IO | PCI_COMMAND_MEMORY | | |
341 | PCI_COMMAND_MASTER | PCI_COMMAND_SERR); | |
342 | pci_write_config_word(dev, PCI_COMMAND, reg); | |
343 | } | |
344 | } | |
345 | DECLARE_PCI_FIXUP_FINAL(PCI_ANY_ID, PCI_ANY_ID, tegra_pcie_fixup_bridge); | |
346 | ||
347 | /* Tegra PCIE root complex wrongly reports device class */ | |
351a102d | 348 | static void tegra_pcie_fixup_class(struct pci_dev *dev) |
77ffc146 MR |
349 | { |
350 | dev->class = PCI_CLASS_BRIDGE_PCI << 8; | |
351 | } | |
352 | DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_NVIDIA, 0x0bf0, tegra_pcie_fixup_class); | |
353 | DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_NVIDIA, 0x0bf1, tegra_pcie_fixup_class); | |
354 | ||
355 | /* Tegra PCIE requires relaxed ordering */ | |
351a102d | 356 | static void tegra_pcie_relax_enable(struct pci_dev *dev) |
77ffc146 | 357 | { |
3b87011d | 358 | pcie_capability_set_word(dev, PCI_EXP_DEVCTL, PCI_EXP_DEVCTL_RELAX_EN); |
77ffc146 MR |
359 | } |
360 | DECLARE_PCI_FIXUP_FINAL(PCI_ANY_ID, PCI_ANY_ID, tegra_pcie_relax_enable); | |
361 | ||
362 | static int tegra_pcie_setup(int nr, struct pci_sys_data *sys) | |
363 | { | |
364 | struct tegra_pcie_port *pp; | |
365 | ||
366 | if (nr >= tegra_pcie.num_ports) | |
367 | return 0; | |
368 | ||
369 | pp = tegra_pcie.port + nr; | |
370 | pp->root_bus_nr = sys->busnr; | |
371 | ||
d94c7a04 | 372 | pci_ioremap_io(nr * SZ_64K, TEGRA_PCIE_IO_BASE); |
77ffc146 MR |
373 | |
374 | /* | |
375 | * IORESOURCE_MEM | |
376 | */ | |
377 | snprintf(pp->mem_space_name, sizeof(pp->mem_space_name), | |
378 | "PCIe %d MEM", pp->index); | |
379 | pp->mem_space_name[sizeof(pp->mem_space_name) - 1] = 0; | |
d94c7a04 | 380 | pp->res[0].name = pp->mem_space_name; |
77ffc146 | 381 | if (pp->index == 0) { |
d94c7a04 RH |
382 | pp->res[0].start = MEM_BASE_0; |
383 | pp->res[0].end = pp->res[0].start + MEM_SIZE_0 - 1; | |
77ffc146 | 384 | } else { |
d94c7a04 RH |
385 | pp->res[0].start = MEM_BASE_1; |
386 | pp->res[0].end = pp->res[0].start + MEM_SIZE_1 - 1; | |
77ffc146 | 387 | } |
d94c7a04 RH |
388 | pp->res[0].flags = IORESOURCE_MEM; |
389 | if (request_resource(&iomem_resource, &pp->res[0])) | |
77ffc146 | 390 | panic("Request PCIe Memory resource failed\n"); |
d94c7a04 | 391 | pci_add_resource_offset(&sys->resources, &pp->res[0], sys->mem_offset); |
77ffc146 MR |
392 | |
393 | /* | |
394 | * IORESOURCE_MEM | IORESOURCE_PREFETCH | |
395 | */ | |
396 | snprintf(pp->prefetch_space_name, sizeof(pp->prefetch_space_name), | |
397 | "PCIe %d PREFETCH MEM", pp->index); | |
398 | pp->prefetch_space_name[sizeof(pp->prefetch_space_name) - 1] = 0; | |
d94c7a04 | 399 | pp->res[1].name = pp->prefetch_space_name; |
77ffc146 | 400 | if (pp->index == 0) { |
d94c7a04 RH |
401 | pp->res[1].start = PREFETCH_MEM_BASE_0; |
402 | pp->res[1].end = pp->res[1].start + PREFETCH_MEM_SIZE_0 - 1; | |
77ffc146 | 403 | } else { |
d94c7a04 RH |
404 | pp->res[1].start = PREFETCH_MEM_BASE_1; |
405 | pp->res[1].end = pp->res[1].start + PREFETCH_MEM_SIZE_1 - 1; | |
77ffc146 | 406 | } |
d94c7a04 RH |
407 | pp->res[1].flags = IORESOURCE_MEM | IORESOURCE_PREFETCH; |
408 | if (request_resource(&iomem_resource, &pp->res[1])) | |
77ffc146 | 409 | panic("Request PCIe Prefetch Memory resource failed\n"); |
d94c7a04 | 410 | pci_add_resource_offset(&sys->resources, &pp->res[1], sys->mem_offset); |
77ffc146 MR |
411 | |
412 | return 1; | |
413 | } | |
414 | ||
d5341942 | 415 | static int tegra_pcie_map_irq(const struct pci_dev *dev, u8 slot, u8 pin) |
77ffc146 MR |
416 | { |
417 | return INT_PCIE_INTR; | |
418 | } | |
419 | ||
420 | static struct pci_bus __init *tegra_pcie_scan_bus(int nr, | |
421 | struct pci_sys_data *sys) | |
422 | { | |
423 | struct tegra_pcie_port *pp; | |
424 | ||
425 | if (nr >= tegra_pcie.num_ports) | |
31e66068 | 426 | return NULL; |
77ffc146 MR |
427 | |
428 | pp = tegra_pcie.port + nr; | |
429 | pp->root_bus_nr = sys->busnr; | |
430 | ||
37d15909 BH |
431 | return pci_scan_root_bus(NULL, sys->busnr, &tegra_pcie_ops, sys, |
432 | &sys->resources); | |
77ffc146 MR |
433 | } |
434 | ||
435 | static struct hw_pci tegra_pcie_hw __initdata = { | |
436 | .nr_controllers = 2, | |
437 | .setup = tegra_pcie_setup, | |
438 | .scan = tegra_pcie_scan_bus, | |
77ffc146 MR |
439 | .map_irq = tegra_pcie_map_irq, |
440 | }; | |
441 | ||
442 | ||
443 | static irqreturn_t tegra_pcie_isr(int irq, void *arg) | |
444 | { | |
445 | const char *err_msg[] = { | |
446 | "Unknown", | |
447 | "AXI slave error", | |
448 | "AXI decode error", | |
449 | "Target abort", | |
450 | "Master abort", | |
451 | "Invalid write", | |
452 | "Response decoding error", | |
453 | "AXI response decoding error", | |
454 | "Transcation timeout", | |
455 | }; | |
456 | ||
457 | u32 code, signature; | |
458 | ||
459 | code = afi_readl(AFI_INTR_CODE) & AFI_INTR_CODE_MASK; | |
460 | signature = afi_readl(AFI_INTR_SIGNATURE); | |
461 | afi_writel(0, AFI_INTR_CODE); | |
462 | ||
463 | if (code == AFI_INTR_LEGACY) | |
464 | return IRQ_NONE; | |
465 | ||
466 | if (code >= ARRAY_SIZE(err_msg)) | |
467 | code = 0; | |
468 | ||
469 | /* | |
470 | * do not pollute kernel log with master abort reports since they | |
471 | * happen a lot during enumeration | |
472 | */ | |
473 | if (code == AFI_INTR_MASTER_ABORT) | |
474 | pr_debug("PCIE: %s, signature: %08x\n", err_msg[code], signature); | |
475 | else | |
476 | pr_err("PCIE: %s, signature: %08x\n", err_msg[code], signature); | |
477 | ||
478 | return IRQ_HANDLED; | |
479 | } | |
480 | ||
481 | static void tegra_pcie_setup_translations(void) | |
482 | { | |
483 | u32 fpci_bar; | |
484 | u32 size; | |
485 | u32 axi_address; | |
486 | ||
487 | /* Bar 0: config Bar */ | |
488 | fpci_bar = ((u32)0xfdff << 16); | |
489 | size = PCIE_CFG_SZ; | |
490 | axi_address = TEGRA_PCIE_BASE + PCIE_CFG_OFF; | |
491 | afi_writel(axi_address, AFI_AXI_BAR0_START); | |
492 | afi_writel(size >> 12, AFI_AXI_BAR0_SZ); | |
493 | afi_writel(fpci_bar, AFI_FPCI_BAR0); | |
494 | ||
495 | /* Bar 1: extended config Bar */ | |
496 | fpci_bar = ((u32)0xfe1 << 20); | |
497 | size = PCIE_EXT_CFG_SZ; | |
498 | axi_address = TEGRA_PCIE_BASE + PCIE_EXT_CFG_OFF; | |
499 | afi_writel(axi_address, AFI_AXI_BAR1_START); | |
500 | afi_writel(size >> 12, AFI_AXI_BAR1_SZ); | |
501 | afi_writel(fpci_bar, AFI_FPCI_BAR1); | |
502 | ||
503 | /* Bar 2: downstream IO bar */ | |
504 | fpci_bar = ((__u32)0xfdfc << 16); | |
d94c7a04 RH |
505 | size = SZ_128K; |
506 | axi_address = TEGRA_PCIE_IO_BASE; | |
77ffc146 MR |
507 | afi_writel(axi_address, AFI_AXI_BAR2_START); |
508 | afi_writel(size >> 12, AFI_AXI_BAR2_SZ); | |
509 | afi_writel(fpci_bar, AFI_FPCI_BAR2); | |
510 | ||
511 | /* Bar 3: prefetchable memory BAR */ | |
512 | fpci_bar = (((PREFETCH_MEM_BASE_0 >> 12) & 0x0fffffff) << 4) | 0x1; | |
513 | size = PREFETCH_MEM_SIZE_0 + PREFETCH_MEM_SIZE_1; | |
514 | axi_address = PREFETCH_MEM_BASE_0; | |
515 | afi_writel(axi_address, AFI_AXI_BAR3_START); | |
516 | afi_writel(size >> 12, AFI_AXI_BAR3_SZ); | |
517 | afi_writel(fpci_bar, AFI_FPCI_BAR3); | |
518 | ||
519 | /* Bar 4: non prefetchable memory BAR */ | |
520 | fpci_bar = (((MEM_BASE_0 >> 12) & 0x0FFFFFFF) << 4) | 0x1; | |
521 | size = MEM_SIZE_0 + MEM_SIZE_1; | |
522 | axi_address = MEM_BASE_0; | |
523 | afi_writel(axi_address, AFI_AXI_BAR4_START); | |
524 | afi_writel(size >> 12, AFI_AXI_BAR4_SZ); | |
525 | afi_writel(fpci_bar, AFI_FPCI_BAR4); | |
526 | ||
527 | /* Bar 5: NULL out the remaining BAR as it is not used */ | |
528 | fpci_bar = 0; | |
529 | size = 0; | |
530 | axi_address = 0; | |
531 | afi_writel(axi_address, AFI_AXI_BAR5_START); | |
532 | afi_writel(size >> 12, AFI_AXI_BAR5_SZ); | |
533 | afi_writel(fpci_bar, AFI_FPCI_BAR5); | |
534 | ||
535 | /* map all upstream transactions as uncached */ | |
536 | afi_writel(PHYS_OFFSET, AFI_CACHE_BAR0_ST); | |
537 | afi_writel(0, AFI_CACHE_BAR0_SZ); | |
538 | afi_writel(0, AFI_CACHE_BAR1_ST); | |
539 | afi_writel(0, AFI_CACHE_BAR1_SZ); | |
540 | ||
541 | /* No MSI */ | |
542 | afi_writel(0, AFI_MSI_FPCI_BAR_ST); | |
543 | afi_writel(0, AFI_MSI_BAR_SZ); | |
544 | afi_writel(0, AFI_MSI_AXI_BAR_ST); | |
545 | afi_writel(0, AFI_MSI_BAR_SZ); | |
546 | } | |
547 | ||
795d5fd4 | 548 | static int tegra_pcie_enable_controller(void) |
77ffc146 MR |
549 | { |
550 | u32 val, reg; | |
795d5fd4 | 551 | int i, timeout; |
77ffc146 MR |
552 | |
553 | /* Enable slot clock and pulse the reset signals */ | |
554 | for (i = 0, reg = AFI_PEX0_CTRL; i < 2; i++, reg += 0x8) { | |
555 | val = afi_readl(reg) | AFI_PEX_CTRL_REFCLK_EN; | |
556 | afi_writel(val, reg); | |
557 | val &= ~AFI_PEX_CTRL_RST; | |
558 | afi_writel(val, reg); | |
559 | ||
560 | val = afi_readl(reg) | AFI_PEX_CTRL_RST; | |
561 | afi_writel(val, reg); | |
562 | } | |
563 | ||
564 | /* Enable dual controller and both ports */ | |
565 | val = afi_readl(AFI_PCIE_CONFIG); | |
566 | val &= ~(AFI_PCIE_CONFIG_PCIEC0_DISABLE_DEVICE | | |
567 | AFI_PCIE_CONFIG_PCIEC1_DISABLE_DEVICE | | |
568 | AFI_PCIE_CONFIG_SM2TMS0_XBAR_CONFIG_MASK); | |
569 | val |= AFI_PCIE_CONFIG_SM2TMS0_XBAR_CONFIG_DUAL; | |
570 | afi_writel(val, AFI_PCIE_CONFIG); | |
571 | ||
572 | val = afi_readl(AFI_FUSE) & ~AFI_FUSE_PCIE_T0_GEN2_DIS; | |
573 | afi_writel(val, AFI_FUSE); | |
574 | ||
575 | /* Initialze internal PHY, enable up to 16 PCIE lanes */ | |
576 | pads_writel(0x0, PADS_CTL_SEL); | |
577 | ||
578 | /* override IDDQ to 1 on all 4 lanes */ | |
579 | val = pads_readl(PADS_CTL) | PADS_CTL_IDDQ_1L; | |
580 | pads_writel(val, PADS_CTL); | |
581 | ||
582 | /* | |
583 | * set up PHY PLL inputs select PLLE output as refclock, | |
584 | * set TX ref sel to div10 (not div5) | |
585 | */ | |
586 | val = pads_readl(PADS_PLL_CTL); | |
587 | val &= ~(PADS_PLL_CTL_REFCLK_MASK | PADS_PLL_CTL_TXCLKREF_MASK); | |
588 | val |= (PADS_PLL_CTL_REFCLK_INTERNAL_CML | PADS_PLL_CTL_TXCLKREF_DIV10); | |
589 | pads_writel(val, PADS_PLL_CTL); | |
590 | ||
591 | /* take PLL out of reset */ | |
592 | val = pads_readl(PADS_PLL_CTL) | PADS_PLL_CTL_RST_B4SM; | |
593 | pads_writel(val, PADS_PLL_CTL); | |
594 | ||
595 | /* | |
596 | * Hack, set the clock voltage to the DEFAULT provided by hw folks. | |
597 | * This doesn't exist in the documentation | |
598 | */ | |
599 | pads_writel(0xfa5cfa5c, 0xc8); | |
600 | ||
601 | /* Wait for the PLL to lock */ | |
2f926eec | 602 | timeout = 300; |
77ffc146 MR |
603 | do { |
604 | val = pads_readl(PADS_PLL_CTL); | |
2f926eec | 605 | usleep_range(1000, 1000); |
795d5fd4 DA |
606 | if (--timeout == 0) { |
607 | pr_err("Tegra PCIe error: timeout waiting for PLL\n"); | |
608 | return -EBUSY; | |
609 | } | |
77ffc146 MR |
610 | } while (!(val & PADS_PLL_CTL_LOCKDET)); |
611 | ||
612 | /* turn off IDDQ override */ | |
613 | val = pads_readl(PADS_CTL) & ~PADS_CTL_IDDQ_1L; | |
614 | pads_writel(val, PADS_CTL); | |
615 | ||
616 | /* enable TX/RX data */ | |
617 | val = pads_readl(PADS_CTL); | |
618 | val |= (PADS_CTL_TX_DATA_EN_1L | PADS_CTL_RX_DATA_EN_1L); | |
619 | pads_writel(val, PADS_CTL); | |
620 | ||
621 | /* Take the PCIe interface module out of reset */ | |
622 | tegra_periph_reset_deassert(tegra_pcie.pcie_xclk); | |
623 | ||
624 | /* Finally enable PCIe */ | |
625 | val = afi_readl(AFI_CONFIGURATION) | AFI_CONFIGURATION_EN_FPCI; | |
626 | afi_writel(val, AFI_CONFIGURATION); | |
627 | ||
628 | val = (AFI_INTR_EN_INI_SLVERR | AFI_INTR_EN_INI_DECERR | | |
629 | AFI_INTR_EN_TGT_SLVERR | AFI_INTR_EN_TGT_DECERR | | |
630 | AFI_INTR_EN_TGT_WRERR | AFI_INTR_EN_DFPCI_DECERR); | |
631 | afi_writel(val, AFI_AFI_INTR_ENABLE); | |
632 | afi_writel(0xffffffff, AFI_SM_INTR_ENABLE); | |
633 | ||
634 | /* FIXME: No MSI for now, only INT */ | |
635 | afi_writel(AFI_INTR_MASK_INT_MASK, AFI_INTR_MASK); | |
636 | ||
637 | /* Disable all execptions */ | |
638 | afi_writel(0, AFI_FPCI_ERROR_MASKS); | |
639 | ||
2f926eec | 640 | return 0; |
77ffc146 MR |
641 | } |
642 | ||
643 | static void tegra_pcie_xclk_clamp(bool clamp) | |
644 | { | |
645 | u32 reg; | |
646 | ||
647 | reg = pmc_readl(PMC_SCRATCH42) & ~PMC_SCRATCH42_PCX_CLAMP; | |
648 | ||
649 | if (clamp) | |
650 | reg |= PMC_SCRATCH42_PCX_CLAMP; | |
651 | ||
652 | pmc_writel(reg, PMC_SCRATCH42); | |
653 | } | |
654 | ||
1e40a97e MR |
655 | static void tegra_pcie_power_off(void) |
656 | { | |
657 | tegra_periph_reset_assert(tegra_pcie.pcie_xclk); | |
658 | tegra_periph_reset_assert(tegra_pcie.afi_clk); | |
659 | tegra_periph_reset_assert(tegra_pcie.pex_clk); | |
660 | ||
b96cc7fe | 661 | tegra_powergate_power_off(TEGRA_POWERGATE_PCIE); |
1e40a97e MR |
662 | tegra_pcie_xclk_clamp(true); |
663 | } | |
664 | ||
b96cc7fe | 665 | static int tegra_pcie_power_regate(void) |
77ffc146 | 666 | { |
b96cc7fe MR |
667 | int err; |
668 | ||
669 | tegra_pcie_power_off(); | |
670 | ||
77ffc146 | 671 | tegra_pcie_xclk_clamp(true); |
b96cc7fe | 672 | |
77ffc146 | 673 | tegra_periph_reset_assert(tegra_pcie.pcie_xclk); |
b96cc7fe MR |
674 | tegra_periph_reset_assert(tegra_pcie.afi_clk); |
675 | ||
676 | err = tegra_powergate_sequence_power_up(TEGRA_POWERGATE_PCIE, | |
677 | tegra_pcie.pex_clk); | |
678 | if (err) { | |
679 | pr_err("PCIE: powerup sequence failed: %d\n", err); | |
680 | return err; | |
681 | } | |
682 | ||
683 | tegra_periph_reset_deassert(tegra_pcie.afi_clk); | |
684 | ||
77ffc146 MR |
685 | tegra_pcie_xclk_clamp(false); |
686 | ||
6a5278d0 PG |
687 | clk_prepare_enable(tegra_pcie.afi_clk); |
688 | clk_prepare_enable(tegra_pcie.pex_clk); | |
689 | return clk_prepare_enable(tegra_pcie.pll_e); | |
77ffc146 MR |
690 | } |
691 | ||
77ffc146 MR |
692 | static int tegra_pcie_clocks_get(void) |
693 | { | |
694 | int err; | |
695 | ||
696 | tegra_pcie.pex_clk = clk_get(NULL, "pex"); | |
697 | if (IS_ERR(tegra_pcie.pex_clk)) | |
698 | return PTR_ERR(tegra_pcie.pex_clk); | |
699 | ||
700 | tegra_pcie.afi_clk = clk_get(NULL, "afi"); | |
701 | if (IS_ERR(tegra_pcie.afi_clk)) { | |
702 | err = PTR_ERR(tegra_pcie.afi_clk); | |
703 | goto err_afi_clk; | |
704 | } | |
705 | ||
706 | tegra_pcie.pcie_xclk = clk_get(NULL, "pcie_xclk"); | |
707 | if (IS_ERR(tegra_pcie.pcie_xclk)) { | |
708 | err = PTR_ERR(tegra_pcie.pcie_xclk); | |
709 | goto err_pcie_xclk; | |
710 | } | |
711 | ||
712 | tegra_pcie.pll_e = clk_get_sys(NULL, "pll_e"); | |
713 | if (IS_ERR(tegra_pcie.pll_e)) { | |
714 | err = PTR_ERR(tegra_pcie.pll_e); | |
715 | goto err_pll_e; | |
716 | } | |
717 | ||
718 | return 0; | |
719 | ||
720 | err_pll_e: | |
721 | clk_put(tegra_pcie.pcie_xclk); | |
722 | err_pcie_xclk: | |
723 | clk_put(tegra_pcie.afi_clk); | |
724 | err_afi_clk: | |
725 | clk_put(tegra_pcie.pex_clk); | |
726 | ||
727 | return err; | |
728 | } | |
729 | ||
730 | static void tegra_pcie_clocks_put(void) | |
731 | { | |
732 | clk_put(tegra_pcie.pll_e); | |
733 | clk_put(tegra_pcie.pcie_xclk); | |
734 | clk_put(tegra_pcie.afi_clk); | |
735 | clk_put(tegra_pcie.pex_clk); | |
736 | } | |
737 | ||
738 | static int __init tegra_pcie_get_resources(void) | |
739 | { | |
77ffc146 MR |
740 | int err; |
741 | ||
742 | err = tegra_pcie_clocks_get(); | |
743 | if (err) { | |
744 | pr_err("PCIE: failed to get clocks: %d\n", err); | |
745 | return err; | |
746 | } | |
747 | ||
b96cc7fe | 748 | err = tegra_pcie_power_regate(); |
77ffc146 MR |
749 | if (err) { |
750 | pr_err("PCIE: failed to power up: %d\n", err); | |
751 | goto err_pwr_on; | |
752 | } | |
753 | ||
754 | tegra_pcie.regs = ioremap_nocache(TEGRA_PCIE_BASE, PCIE_IOMAP_SZ); | |
755 | if (tegra_pcie.regs == NULL) { | |
756 | pr_err("PCIE: Failed to map PCI/AFI registers\n"); | |
757 | err = -ENOMEM; | |
758 | goto err_map_reg; | |
759 | } | |
760 | ||
77ffc146 MR |
761 | err = request_irq(INT_PCIE_INTR, tegra_pcie_isr, |
762 | IRQF_SHARED, "PCIE", &tegra_pcie); | |
763 | if (err) { | |
764 | pr_err("PCIE: Failed to register IRQ: %d\n", err); | |
d94c7a04 | 765 | goto err_req_io; |
77ffc146 MR |
766 | } |
767 | set_irq_flags(INT_PCIE_INTR, IRQF_VALID); | |
768 | ||
769 | return 0; | |
770 | ||
77ffc146 MR |
771 | err_req_io: |
772 | iounmap(tegra_pcie.regs); | |
773 | err_map_reg: | |
774 | tegra_pcie_power_off(); | |
775 | err_pwr_on: | |
776 | tegra_pcie_clocks_put(); | |
777 | ||
778 | return err; | |
779 | } | |
780 | ||
781 | /* | |
782 | * FIXME: If there are no PCIe cards attached, then calling this function | |
783 | * can result in the increase of the bootup time as there are big timeout | |
784 | * loops. | |
785 | */ | |
786 | #define TEGRA_PCIE_LINKUP_TIMEOUT 200 /* up to 1.2 seconds */ | |
787 | static bool tegra_pcie_check_link(struct tegra_pcie_port *pp, int idx, | |
788 | u32 reset_reg) | |
789 | { | |
790 | u32 reg; | |
791 | int retries = 3; | |
792 | int timeout; | |
793 | ||
794 | do { | |
795 | timeout = TEGRA_PCIE_LINKUP_TIMEOUT; | |
796 | while (timeout) { | |
797 | reg = readl(pp->base + RP_VEND_XP); | |
798 | ||
799 | if (reg & RP_VEND_XP_DL_UP) | |
800 | break; | |
801 | ||
802 | mdelay(1); | |
803 | timeout--; | |
804 | } | |
805 | ||
806 | if (!timeout) { | |
807 | pr_err("PCIE: port %d: link down, retrying\n", idx); | |
808 | goto retry; | |
809 | } | |
810 | ||
811 | timeout = TEGRA_PCIE_LINKUP_TIMEOUT; | |
812 | while (timeout) { | |
813 | reg = readl(pp->base + RP_LINK_CONTROL_STATUS); | |
814 | ||
815 | if (reg & 0x20000000) | |
816 | return true; | |
817 | ||
818 | mdelay(1); | |
819 | timeout--; | |
820 | } | |
821 | ||
822 | retry: | |
823 | /* Pulse the PEX reset */ | |
824 | reg = afi_readl(reset_reg) | AFI_PEX_CTRL_RST; | |
825 | afi_writel(reg, reset_reg); | |
826 | mdelay(1); | |
827 | reg = afi_readl(reset_reg) & ~AFI_PEX_CTRL_RST; | |
828 | afi_writel(reg, reset_reg); | |
829 | ||
830 | retries--; | |
831 | } while (retries); | |
832 | ||
833 | return false; | |
834 | } | |
835 | ||
836 | static void __init tegra_pcie_add_port(int index, u32 offset, u32 reset_reg) | |
837 | { | |
838 | struct tegra_pcie_port *pp; | |
839 | ||
840 | pp = tegra_pcie.port + tegra_pcie.num_ports; | |
841 | ||
842 | pp->index = -1; | |
843 | pp->base = tegra_pcie.regs + offset; | |
844 | pp->link_up = tegra_pcie_check_link(pp, index, reset_reg); | |
845 | ||
846 | if (!pp->link_up) { | |
847 | pp->base = NULL; | |
848 | printk(KERN_INFO "PCIE: port %d: link down, ignoring\n", index); | |
849 | return; | |
850 | } | |
851 | ||
852 | tegra_pcie.num_ports++; | |
853 | pp->index = index; | |
854 | pp->root_bus_nr = -1; | |
855 | memset(pp->res, 0, sizeof(pp->res)); | |
856 | } | |
857 | ||
858 | int __init tegra_pcie_init(bool init_port0, bool init_port1) | |
859 | { | |
860 | int err; | |
861 | ||
862 | if (!(init_port0 || init_port1)) | |
863 | return -ENODEV; | |
864 | ||
c9d95fbe RH |
865 | pcibios_min_mem = 0; |
866 | ||
77ffc146 MR |
867 | err = tegra_pcie_get_resources(); |
868 | if (err) | |
869 | return err; | |
870 | ||
795d5fd4 DA |
871 | err = tegra_pcie_enable_controller(); |
872 | if (err) | |
873 | return err; | |
77ffc146 MR |
874 | |
875 | /* setup the AFI address translations */ | |
876 | tegra_pcie_setup_translations(); | |
877 | ||
878 | if (init_port0) | |
879 | tegra_pcie_add_port(0, RP0_OFFSET, AFI_PEX0_CTRL); | |
880 | ||
881 | if (init_port1) | |
882 | tegra_pcie_add_port(1, RP1_OFFSET, AFI_PEX1_CTRL); | |
883 | ||
884 | pci_common_init(&tegra_pcie_hw); | |
885 | ||
886 | return 0; | |
887 | } |