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5713e602 PM |
1 | /* |
2 | * Low-Level PCI Express Support for the SH7786 | |
3 | * | |
7561f2dd | 4 | * Copyright (C) 2009 - 2010 Paul Mundt |
5713e602 PM |
5 | * |
6 | * This file is subject to the terms and conditions of the GNU General Public | |
7 | * License. See the file "COPYING" in the main directory of this archive | |
8 | * for more details. | |
9 | */ | |
10 | #include <linux/pci.h> | |
11 | #include <linux/init.h> | |
12 | #include <linux/kernel.h> | |
13 | #include <linux/io.h> | |
14 | #include <linux/delay.h> | |
5a0e3ad6 | 15 | #include <linux/slab.h> |
5713e602 PM |
16 | #include "pcie-sh7786.h" |
17 | #include <asm/sizes.h> | |
18 | ||
19 | struct sh7786_pcie_port { | |
20 | struct pci_channel *hose; | |
21 | unsigned int index; | |
22 | int endpoint; | |
23 | int link; | |
24 | }; | |
25 | ||
26 | static struct sh7786_pcie_port *sh7786_pcie_ports; | |
27 | static unsigned int nr_ports; | |
28 | ||
29 | static struct sh7786_pcie_hwops { | |
30 | int (*core_init)(void); | |
31 | int (*port_init_hw)(struct sh7786_pcie_port *port); | |
32 | } *sh7786_pcie_hwops; | |
33 | ||
7561f2dd | 34 | static struct resource sh7786_pci0_resources[] = { |
5713e602 | 35 | { |
7561f2dd PM |
36 | .name = "PCIe0 IO", |
37 | .start = 0xfd000000, | |
38 | .end = 0xfd000000 + SZ_8M - 1, | |
39 | .flags = IORESOURCE_IO, | |
5713e602 | 40 | }, { |
7561f2dd PM |
41 | .name = "PCIe0 MEM 0", |
42 | .start = 0xc0000000, | |
43 | .end = 0xc0000000 + SZ_512M - 1, | |
44 | .flags = IORESOURCE_MEM | IORESOURCE_MEM_32BIT, | |
5713e602 | 45 | }, { |
7561f2dd PM |
46 | .name = "PCIe0 MEM 1", |
47 | .start = 0x10000000, | |
48 | .end = 0x10000000 + SZ_64M - 1, | |
5713e602 | 49 | .flags = IORESOURCE_MEM, |
7561f2dd PM |
50 | }, { |
51 | .name = "PCIe0 MEM 2", | |
52 | .start = 0xfe100000, | |
53 | .end = 0xfe100000 + SZ_1M - 1, | |
5713e602 PM |
54 | }, |
55 | }; | |
56 | ||
7561f2dd PM |
57 | static struct resource sh7786_pci1_resources[] = { |
58 | { | |
59 | .name = "PCIe1 IO", | |
60 | .start = 0xfd800000, | |
61 | .end = 0xfd800000 + SZ_8M - 1, | |
62 | .flags = IORESOURCE_IO, | |
63 | }, { | |
64 | .name = "PCIe1 MEM 0", | |
65 | .start = 0xa0000000, | |
66 | .end = 0xa0000000 + SZ_512M - 1, | |
67 | .flags = IORESOURCE_MEM | IORESOURCE_MEM_32BIT, | |
68 | }, { | |
69 | .name = "PCIe1 MEM 1", | |
70 | .start = 0x30000000, | |
71 | .end = 0x30000000 + SZ_256M - 1, | |
72 | .flags = IORESOURCE_MEM | IORESOURCE_MEM_32BIT, | |
73 | }, { | |
74 | .name = "PCIe1 MEM 2", | |
75 | .start = 0xfe300000, | |
76 | .end = 0xfe300000 + SZ_1M - 1, | |
77 | }, | |
5713e602 PM |
78 | }; |
79 | ||
7561f2dd | 80 | static struct resource sh7786_pci2_resources[] = { |
5713e602 | 81 | { |
7561f2dd PM |
82 | .name = "PCIe2 IO", |
83 | .start = 0xfc800000, | |
84 | .end = 0xfc800000 + SZ_4M - 1, | |
5713e602 | 85 | }, { |
7561f2dd PM |
86 | .name = "PCIe2 MEM 0", |
87 | .start = 0x80000000, | |
88 | .end = 0x80000000 + SZ_512M - 1, | |
89 | .flags = IORESOURCE_MEM | IORESOURCE_MEM_32BIT, | |
5713e602 | 90 | }, { |
7561f2dd PM |
91 | .name = "PCIe2 MEM 1", |
92 | .start = 0x20000000, | |
93 | .end = 0x20000000 + SZ_256M - 1, | |
94 | .flags = IORESOURCE_MEM | IORESOURCE_MEM_32BIT, | |
95 | }, { | |
96 | .name = "PCIe2 MEM 2", | |
97 | .start = 0xfcd00000, | |
98 | .end = 0xfcd00000 + SZ_1M - 1, | |
5713e602 PM |
99 | }, |
100 | }; | |
101 | ||
102 | extern struct pci_ops sh7786_pci_ops; | |
103 | ||
7561f2dd PM |
104 | #define DEFINE_CONTROLLER(start, idx) \ |
105 | { \ | |
106 | .pci_ops = &sh7786_pci_ops, \ | |
107 | .resources = sh7786_pci##idx##_resources, \ | |
108 | .nr_resources = ARRAY_SIZE(sh7786_pci##idx##_resources), \ | |
109 | .reg_base = start, \ | |
110 | .mem_offset = 0, \ | |
111 | .io_offset = 0, \ | |
5713e602 PM |
112 | } |
113 | ||
114 | static struct pci_channel sh7786_pci_channels[] = { | |
115 | DEFINE_CONTROLLER(0xfe000000, 0), | |
116 | DEFINE_CONTROLLER(0xfe200000, 1), | |
117 | DEFINE_CONTROLLER(0xfcc00000, 2), | |
118 | }; | |
119 | ||
120 | static int phy_wait_for_ack(struct pci_channel *chan) | |
121 | { | |
122 | unsigned int timeout = 100; | |
123 | ||
124 | while (timeout--) { | |
125 | if (pci_read_reg(chan, SH4A_PCIEPHYADRR) & (1 << BITS_ACK)) | |
126 | return 0; | |
127 | ||
128 | udelay(100); | |
129 | } | |
130 | ||
131 | return -ETIMEDOUT; | |
132 | } | |
133 | ||
134 | static int pci_wait_for_irq(struct pci_channel *chan, unsigned int mask) | |
135 | { | |
136 | unsigned int timeout = 100; | |
137 | ||
138 | while (timeout--) { | |
139 | if ((pci_read_reg(chan, SH4A_PCIEINTR) & mask) == mask) | |
140 | return 0; | |
141 | ||
142 | udelay(100); | |
143 | } | |
144 | ||
145 | return -ETIMEDOUT; | |
146 | } | |
147 | ||
148 | static void phy_write_reg(struct pci_channel *chan, unsigned int addr, | |
149 | unsigned int lane, unsigned int data) | |
150 | { | |
151 | unsigned long phyaddr, ctrl; | |
152 | ||
153 | phyaddr = (1 << BITS_CMD) + ((lane & 0xf) << BITS_LANE) + | |
154 | ((addr & 0xff) << BITS_ADR); | |
155 | ||
156 | /* Enable clock */ | |
157 | ctrl = pci_read_reg(chan, SH4A_PCIEPHYCTLR); | |
158 | ctrl |= (1 << BITS_CKE); | |
159 | pci_write_reg(chan, ctrl, SH4A_PCIEPHYCTLR); | |
160 | ||
161 | /* Set write data */ | |
162 | pci_write_reg(chan, data, SH4A_PCIEPHYDOUTR); | |
163 | pci_write_reg(chan, phyaddr, SH4A_PCIEPHYADRR); | |
164 | ||
165 | phy_wait_for_ack(chan); | |
166 | ||
167 | /* Clear command */ | |
168 | pci_write_reg(chan, 0, SH4A_PCIEPHYADRR); | |
169 | ||
170 | phy_wait_for_ack(chan); | |
171 | ||
172 | /* Disable clock */ | |
173 | ctrl = pci_read_reg(chan, SH4A_PCIEPHYCTLR); | |
174 | ctrl &= ~(1 << BITS_CKE); | |
175 | pci_write_reg(chan, ctrl, SH4A_PCIEPHYCTLR); | |
176 | } | |
177 | ||
178 | static int phy_init(struct pci_channel *chan) | |
179 | { | |
180 | unsigned int timeout = 100; | |
181 | ||
182 | /* Initialize the phy */ | |
183 | phy_write_reg(chan, 0x60, 0xf, 0x004b008b); | |
184 | phy_write_reg(chan, 0x61, 0xf, 0x00007b41); | |
185 | phy_write_reg(chan, 0x64, 0xf, 0x00ff4f00); | |
186 | phy_write_reg(chan, 0x65, 0xf, 0x09070907); | |
187 | phy_write_reg(chan, 0x66, 0xf, 0x00000010); | |
188 | phy_write_reg(chan, 0x74, 0xf, 0x0007001c); | |
189 | phy_write_reg(chan, 0x79, 0xf, 0x01fc000d); | |
190 | ||
191 | /* Deassert Standby */ | |
192 | phy_write_reg(chan, 0x67, 0xf, 0x00000400); | |
193 | ||
194 | while (timeout--) { | |
195 | if (pci_read_reg(chan, SH4A_PCIEPHYSR)) | |
196 | return 0; | |
197 | ||
198 | udelay(100); | |
199 | } | |
200 | ||
201 | return -ETIMEDOUT; | |
202 | } | |
203 | ||
204 | static int pcie_init(struct sh7786_pcie_port *port) | |
205 | { | |
206 | struct pci_channel *chan = port->hose; | |
207 | unsigned int data; | |
7578a4c6 PM |
208 | phys_addr_t memphys; |
209 | size_t memsize; | |
210 | int ret, i; | |
5713e602 PM |
211 | |
212 | /* Begin initialization */ | |
213 | pci_write_reg(chan, 0, SH4A_PCIETCTLR); | |
214 | ||
215 | /* Initialize as type1. */ | |
216 | data = pci_read_reg(chan, SH4A_PCIEPCICONF3); | |
217 | data &= ~(0x7f << 16); | |
218 | data |= PCI_HEADER_TYPE_BRIDGE << 16; | |
219 | pci_write_reg(chan, data, SH4A_PCIEPCICONF3); | |
220 | ||
221 | /* Initialize default capabilities. */ | |
222 | data = pci_read_reg(chan, SH4A_PCIEEXPCAP0); | |
223 | data &= ~(PCI_EXP_FLAGS_TYPE << 16); | |
224 | ||
225 | if (port->endpoint) | |
226 | data |= PCI_EXP_TYPE_ENDPOINT << 20; | |
227 | else | |
228 | data |= PCI_EXP_TYPE_ROOT_PORT << 20; | |
229 | ||
230 | data |= PCI_CAP_ID_EXP; | |
231 | pci_write_reg(chan, data, SH4A_PCIEEXPCAP0); | |
232 | ||
7578a4c6 PM |
233 | /* Enable data link layer active state reporting */ |
234 | pci_write_reg(chan, PCI_EXP_LNKCAP_DLLLARC, SH4A_PCIEEXPCAP3); | |
235 | ||
236 | /* Enable extended sync and ASPM L0s support */ | |
5713e602 | 237 | data = pci_read_reg(chan, SH4A_PCIEEXPCAP4); |
7578a4c6 PM |
238 | data &= ~PCI_EXP_LNKCTL_ASPMC; |
239 | data |= PCI_EXP_LNKCTL_ES | 1; | |
5713e602 PM |
240 | pci_write_reg(chan, data, SH4A_PCIEEXPCAP4); |
241 | ||
7578a4c6 PM |
242 | /* Write out the physical slot number */ |
243 | data = pci_read_reg(chan, SH4A_PCIEEXPCAP5); | |
244 | data &= ~PCI_EXP_SLTCAP_PSN; | |
245 | data |= (port->index + 1) << 19; | |
246 | pci_write_reg(chan, data, SH4A_PCIEEXPCAP5); | |
247 | ||
5713e602 PM |
248 | /* Set the completion timer timeout to the maximum 32ms. */ |
249 | data = pci_read_reg(chan, SH4A_PCIETLCTLR); | |
7578a4c6 | 250 | data &= ~0x3f00; |
5713e602 PM |
251 | data |= 0x32 << 8; |
252 | pci_write_reg(chan, data, SH4A_PCIETLCTLR); | |
253 | ||
254 | /* | |
255 | * Set fast training sequences to the maximum 255, | |
256 | * and enable MAC data scrambling. | |
257 | */ | |
258 | data = pci_read_reg(chan, SH4A_PCIEMACCTLR); | |
259 | data &= ~PCIEMACCTLR_SCR_DIS; | |
260 | data |= (0xff << 16); | |
261 | pci_write_reg(chan, data, SH4A_PCIEMACCTLR); | |
262 | ||
7578a4c6 PM |
263 | memphys = __pa(memory_start); |
264 | memsize = roundup_pow_of_two(memory_end - memory_start); | |
265 | ||
266 | /* | |
267 | * If there's more than 512MB of memory, we need to roll over to | |
268 | * LAR1/LAMR1. | |
269 | */ | |
270 | if (memsize > SZ_512M) { | |
271 | __raw_writel(memphys + SZ_512M, chan->reg_base + SH4A_PCIELAR1); | |
272 | __raw_writel(((memsize - SZ_512M) - SZ_256) | 1, | |
273 | chan->reg_base + SH4A_PCIELAMR1); | |
274 | memsize = SZ_512M; | |
275 | } else { | |
276 | /* | |
277 | * Otherwise just zero it out and disable it. | |
278 | */ | |
279 | __raw_writel(0, chan->reg_base + SH4A_PCIELAR1); | |
280 | __raw_writel(0, chan->reg_base + SH4A_PCIELAMR1); | |
281 | } | |
282 | ||
283 | /* | |
284 | * LAR0/LAMR0 covers up to the first 512MB, which is enough to | |
285 | * cover all of lowmem on most platforms. | |
286 | */ | |
287 | __raw_writel(memphys, chan->reg_base + SH4A_PCIELAR0); | |
288 | __raw_writel((memsize - SZ_256) | 1, chan->reg_base + SH4A_PCIELAMR0); | |
289 | ||
5713e602 PM |
290 | /* Finish initialization */ |
291 | data = pci_read_reg(chan, SH4A_PCIETCTLR); | |
292 | data |= 0x1; | |
293 | pci_write_reg(chan, data, SH4A_PCIETCTLR); | |
294 | ||
295 | /* Enable DL_Active Interrupt generation */ | |
296 | data = pci_read_reg(chan, SH4A_PCIEDLINTENR); | |
297 | data |= PCIEDLINTENR_DLL_ACT_ENABLE; | |
298 | pci_write_reg(chan, data, SH4A_PCIEDLINTENR); | |
299 | ||
300 | /* Disable MAC data scrambling. */ | |
301 | data = pci_read_reg(chan, SH4A_PCIEMACCTLR); | |
302 | data |= PCIEMACCTLR_SCR_DIS | (0xff << 16); | |
303 | pci_write_reg(chan, data, SH4A_PCIEMACCTLR); | |
304 | ||
305 | ret = pci_wait_for_irq(chan, MASK_INT_TX_CTRL); | |
306 | if (unlikely(ret != 0)) | |
307 | return -ENODEV; | |
308 | ||
7578a4c6 PM |
309 | data = pci_read_reg(chan, SH4A_PCIEPCICONF1); |
310 | data &= ~(PCI_STATUS_DEVSEL_MASK << 16); | |
311 | data |= PCI_COMMAND_IO | PCI_COMMAND_MEMORY | PCI_COMMAND_MASTER | | |
312 | (PCI_STATUS_CAP_LIST | PCI_STATUS_DEVSEL_FAST) << 16; | |
313 | pci_write_reg(chan, data, SH4A_PCIEPCICONF1); | |
314 | ||
5713e602 PM |
315 | pci_write_reg(chan, 0x80888000, SH4A_PCIETXVC0DCTLR); |
316 | pci_write_reg(chan, 0x00222000, SH4A_PCIERXVC0DCTLR); | |
5713e602 PM |
317 | |
318 | wmb(); | |
319 | ||
320 | data = pci_read_reg(chan, SH4A_PCIEMACSR); | |
321 | printk(KERN_NOTICE "PCI: PCIe#%d link width %d\n", | |
322 | port->index, (data >> 20) & 0x3f); | |
323 | ||
5713e602 | 324 | |
7578a4c6 PM |
325 | for (i = 0; i < chan->nr_resources; i++) { |
326 | struct resource *res = chan->resources + i; | |
327 | resource_size_t size; | |
328 | u32 enable_mask; | |
329 | ||
330 | pci_write_reg(chan, 0x00000000, SH4A_PCIEPTCTLR(i)); | |
331 | ||
332 | size = resource_size(res); | |
333 | ||
334 | /* | |
335 | * The PAMR mask is calculated in units of 256kB, which | |
336 | * keeps things pretty simple. | |
337 | */ | |
338 | __raw_writel(((roundup_pow_of_two(size) / SZ_256K) - 1) << 18, | |
339 | chan->reg_base + SH4A_PCIEPAMR(i)); | |
340 | ||
341 | pci_write_reg(chan, 0x00000000, SH4A_PCIEPARH(i)); | |
342 | pci_write_reg(chan, 0x00000000, SH4A_PCIEPARL(i)); | |
343 | ||
344 | enable_mask = MASK_PARE; | |
345 | if (res->flags & IORESOURCE_IO) | |
346 | enable_mask |= MASK_SPC; | |
347 | ||
348 | pci_write_reg(chan, enable_mask, SH4A_PCIEPTCTLR(i)); | |
349 | } | |
5713e602 PM |
350 | |
351 | return 0; | |
352 | } | |
353 | ||
354 | int __init pcibios_map_platform_irq(struct pci_dev *pdev, u8 slot, u8 pin) | |
355 | { | |
356 | return 71; | |
357 | } | |
358 | ||
359 | static int sh7786_pcie_core_init(void) | |
360 | { | |
361 | /* Return the number of ports */ | |
362 | return test_mode_pin(MODE_PIN12) ? 3 : 2; | |
363 | } | |
364 | ||
365 | static int __devinit sh7786_pcie_init_hw(struct sh7786_pcie_port *port) | |
366 | { | |
367 | int ret; | |
368 | ||
369 | ret = phy_init(port->hose); | |
370 | if (unlikely(ret < 0)) | |
371 | return ret; | |
372 | ||
373 | /* | |
374 | * Check if we are configured in endpoint or root complex mode, | |
375 | * this is a fixed pin setting that applies to all PCIe ports. | |
376 | */ | |
377 | port->endpoint = test_mode_pin(MODE_PIN11); | |
378 | ||
379 | ret = pcie_init(port); | |
380 | if (unlikely(ret < 0)) | |
381 | return ret; | |
382 | ||
bcf39352 | 383 | return register_pci_controller(port->hose); |
5713e602 PM |
384 | } |
385 | ||
386 | static struct sh7786_pcie_hwops sh7786_65nm_pcie_hwops __initdata = { | |
387 | .core_init = sh7786_pcie_core_init, | |
388 | .port_init_hw = sh7786_pcie_init_hw, | |
389 | }; | |
390 | ||
391 | static int __init sh7786_pcie_init(void) | |
392 | { | |
393 | int ret = 0, i; | |
394 | ||
395 | printk(KERN_NOTICE "PCI: Starting intialization.\n"); | |
396 | ||
397 | sh7786_pcie_hwops = &sh7786_65nm_pcie_hwops; | |
398 | ||
399 | nr_ports = sh7786_pcie_hwops->core_init(); | |
400 | BUG_ON(nr_ports > ARRAY_SIZE(sh7786_pci_channels)); | |
401 | ||
402 | if (unlikely(nr_ports == 0)) | |
403 | return -ENODEV; | |
404 | ||
405 | sh7786_pcie_ports = kzalloc(nr_ports * sizeof(struct sh7786_pcie_port), | |
406 | GFP_KERNEL); | |
407 | if (unlikely(!sh7786_pcie_ports)) | |
408 | return -ENOMEM; | |
409 | ||
410 | printk(KERN_NOTICE "PCI: probing %d ports.\n", nr_ports); | |
411 | ||
412 | for (i = 0; i < nr_ports; i++) { | |
413 | struct sh7786_pcie_port *port = sh7786_pcie_ports + i; | |
414 | ||
415 | port->index = i; | |
416 | port->hose = sh7786_pci_channels + i; | |
7561f2dd | 417 | port->hose->io_map_base = port->hose->resources[0].start; |
5713e602 PM |
418 | |
419 | ret |= sh7786_pcie_hwops->port_init_hw(port); | |
420 | } | |
421 | ||
422 | if (unlikely(ret)) | |
423 | return ret; | |
424 | ||
425 | return 0; | |
426 | } | |
427 | arch_initcall(sh7786_pcie_init); |