1 /*
2 * PCI code for the Freescale MPC52xx embedded CPU.
3 *
4 * Copyright (C) 2006 Secret Lab Technologies Ltd.
5 * Grant Likely <grant.likely@secretlab.ca>
6 * Copyright (C) 2004 Sylvain Munaut <tnt@246tNt.com>
7 *
8 * This file is licensed under the terms of the GNU General Public License
9 * version 2. This program is licensed "as is" without any warranty of any
10 * kind, whether express or implied.
11 */
12
13 #undef DEBUG
14
15 #include <linux/pci.h>
16 #include <asm/mpc52xx.h>
17 #include <asm/delay.h>
18 #include <asm/machdep.h>
19 #include <linux/kernel.h>
20
21
22 /* ======================================================================== */
23 /* Structures mapping & Defines for PCI Unit */
24 /* ======================================================================== */
25
26 #define MPC52xx_PCI_GSCR_BM 0x40000000
27 #define MPC52xx_PCI_GSCR_PE 0x20000000
28 #define MPC52xx_PCI_GSCR_SE 0x10000000
29 #define MPC52xx_PCI_GSCR_XLB2PCI_MASK 0x07000000
30 #define MPC52xx_PCI_GSCR_XLB2PCI_SHIFT 24
31 #define MPC52xx_PCI_GSCR_IPG2PCI_MASK 0x00070000
32 #define MPC52xx_PCI_GSCR_IPG2PCI_SHIFT 16
33 #define MPC52xx_PCI_GSCR_BME 0x00004000
34 #define MPC52xx_PCI_GSCR_PEE 0x00002000
35 #define MPC52xx_PCI_GSCR_SEE 0x00001000
36 #define MPC52xx_PCI_GSCR_PR 0x00000001
37
38
39 #define MPC52xx_PCI_IWBTAR_TRANSLATION(proc_ad,pci_ad,size) \
40 ( ( (proc_ad) & 0xff000000 ) | \
41 ( (((size) - 1) >> 8) & 0x00ff0000 ) | \
42 ( ((pci_ad) >> 16) & 0x0000ff00 ) )
43
44 #define MPC52xx_PCI_IWCR_PACK(win0,win1,win2) (((win0) << 24) | \
45 ((win1) << 16) | \
46 ((win2) << 8))
47
48 #define MPC52xx_PCI_IWCR_DISABLE 0x0
49 #define MPC52xx_PCI_IWCR_ENABLE 0x1
50 #define MPC52xx_PCI_IWCR_READ 0x0
51 #define MPC52xx_PCI_IWCR_READ_LINE 0x2
52 #define MPC52xx_PCI_IWCR_READ_MULTI 0x4
53 #define MPC52xx_PCI_IWCR_MEM 0x0
54 #define MPC52xx_PCI_IWCR_IO 0x8
55
56 #define MPC52xx_PCI_TCR_P 0x01000000
57 #define MPC52xx_PCI_TCR_LD 0x00010000
58 #define MPC52xx_PCI_TCR_WCT8 0x00000008
59
60 #define MPC52xx_PCI_TBATR_DISABLE 0x0
61 #define MPC52xx_PCI_TBATR_ENABLE 0x1
62
63 struct mpc52xx_pci {
64 u32 idr; /* PCI + 0x00 */
65 u32 scr; /* PCI + 0x04 */
66 u32 ccrir; /* PCI + 0x08 */
67 u32 cr1; /* PCI + 0x0C */
68 u32 bar0; /* PCI + 0x10 */
69 u32 bar1; /* PCI + 0x14 */
70 u8 reserved1[16]; /* PCI + 0x18 */
71 u32 ccpr; /* PCI + 0x28 */
72 u32 sid; /* PCI + 0x2C */
73 u32 erbar; /* PCI + 0x30 */
74 u32 cpr; /* PCI + 0x34 */
75 u8 reserved2[4]; /* PCI + 0x38 */
76 u32 cr2; /* PCI + 0x3C */
77 u8 reserved3[32]; /* PCI + 0x40 */
78 u32 gscr; /* PCI + 0x60 */
79 u32 tbatr0; /* PCI + 0x64 */
80 u32 tbatr1; /* PCI + 0x68 */
81 u32 tcr; /* PCI + 0x6C */
82 u32 iw0btar; /* PCI + 0x70 */
83 u32 iw1btar; /* PCI + 0x74 */
84 u32 iw2btar; /* PCI + 0x78 */
85 u8 reserved4[4]; /* PCI + 0x7C */
86 u32 iwcr; /* PCI + 0x80 */
87 u32 icr; /* PCI + 0x84 */
88 u32 isr; /* PCI + 0x88 */
89 u32 arb; /* PCI + 0x8C */
90 u8 reserved5[104]; /* PCI + 0x90 */
91 u32 car; /* PCI + 0xF8 */
92 u8 reserved6[4]; /* PCI + 0xFC */
93 };
94
95 /* MPC5200 device tree match tables */
96 const struct of_device_id mpc52xx_pci_ids[] __initconst = {
97 { .type = "pci", .compatible = "fsl,mpc5200-pci", },
98 { .type = "pci", .compatible = "mpc5200-pci", },
99 {}
100 };
101
102 /* ======================================================================== */
103 /* PCI configuration access */
104 /* ======================================================================== */
105
106 static int
mpc52xx_pci_read_config(struct pci_bus * bus,unsigned int devfn,int offset,int len,u32 * val)107 mpc52xx_pci_read_config(struct pci_bus *bus, unsigned int devfn,
108 int offset, int len, u32 *val)
109 {
110 struct pci_controller *hose = pci_bus_to_host(bus);
111 u32 value;
112
113 if (ppc_md.pci_exclude_device)
114 if (ppc_md.pci_exclude_device(hose, bus->number, devfn))
115 return PCIBIOS_DEVICE_NOT_FOUND;
116
117 out_be32(hose->cfg_addr,
118 (1 << 31) |
119 (bus->number << 16) |
120 (devfn << 8) |
121 (offset & 0xfc));
122 mb();
123
124 #if defined(CONFIG_PPC_MPC5200_BUGFIX)
125 if (bus->number) {
126 /* workaround for the bug 435 of the MPC5200 (L25R);
127 * Don't do 32 bits config access during type-1 cycles */
128 switch (len) {
129 case 1:
130 value = in_8(((u8 __iomem *)hose->cfg_data) +
131 (offset & 3));
132 break;
133 case 2:
134 value = in_le16(((u16 __iomem *)hose->cfg_data) +
135 ((offset>>1) & 1));
136 break;
137
138 default:
139 value = in_le16((u16 __iomem *)hose->cfg_data) |
140 (in_le16(((u16 __iomem *)hose->cfg_data) + 1) << 16);
141 break;
142 }
143 }
144 else
145 #endif
146 {
147 value = in_le32(hose->cfg_data);
148
149 if (len != 4) {
150 value >>= ((offset & 0x3) << 3);
151 value &= 0xffffffff >> (32 - (len << 3));
152 }
153 }
154
155 *val = value;
156
157 out_be32(hose->cfg_addr, 0);
158 mb();
159
160 return PCIBIOS_SUCCESSFUL;
161 }
162
163 static int
mpc52xx_pci_write_config(struct pci_bus * bus,unsigned int devfn,int offset,int len,u32 val)164 mpc52xx_pci_write_config(struct pci_bus *bus, unsigned int devfn,
165 int offset, int len, u32 val)
166 {
167 struct pci_controller *hose = pci_bus_to_host(bus);
168 u32 value, mask;
169
170 if (ppc_md.pci_exclude_device)
171 if (ppc_md.pci_exclude_device(hose, bus->number, devfn))
172 return PCIBIOS_DEVICE_NOT_FOUND;
173
174 out_be32(hose->cfg_addr,
175 (1 << 31) |
176 (bus->number << 16) |
177 (devfn << 8) |
178 (offset & 0xfc));
179 mb();
180
181 #if defined(CONFIG_PPC_MPC5200_BUGFIX)
182 if (bus->number) {
183 /* workaround for the bug 435 of the MPC5200 (L25R);
184 * Don't do 32 bits config access during type-1 cycles */
185 switch (len) {
186 case 1:
187 out_8(((u8 __iomem *)hose->cfg_data) +
188 (offset & 3), val);
189 break;
190 case 2:
191 out_le16(((u16 __iomem *)hose->cfg_data) +
192 ((offset>>1) & 1), val);
193 break;
194
195 default:
196 out_le16((u16 __iomem *)hose->cfg_data,
197 (u16)val);
198 out_le16(((u16 __iomem *)hose->cfg_data) + 1,
199 (u16)(val>>16));
200 break;
201 }
202 }
203 else
204 #endif
205 {
206 if (len != 4) {
207 value = in_le32(hose->cfg_data);
208
209 offset = (offset & 0x3) << 3;
210 mask = (0xffffffff >> (32 - (len << 3)));
211 mask <<= offset;
212
213 value &= ~mask;
214 val = value | ((val << offset) & mask);
215 }
216
217 out_le32(hose->cfg_data, val);
218 }
219 mb();
220
221 out_be32(hose->cfg_addr, 0);
222 mb();
223
224 return PCIBIOS_SUCCESSFUL;
225 }
226
227 static struct pci_ops mpc52xx_pci_ops = {
228 .read = mpc52xx_pci_read_config,
229 .write = mpc52xx_pci_write_config
230 };
231
232
233 /* ======================================================================== */
234 /* PCI setup */
235 /* ======================================================================== */
236
237 static void __init
mpc52xx_pci_setup(struct pci_controller * hose,struct mpc52xx_pci __iomem * pci_regs,phys_addr_t pci_phys)238 mpc52xx_pci_setup(struct pci_controller *hose,
239 struct mpc52xx_pci __iomem *pci_regs, phys_addr_t pci_phys)
240 {
241 struct resource *res;
242 u32 tmp;
243 int iwcr0 = 0, iwcr1 = 0, iwcr2 = 0;
244
245 pr_debug("mpc52xx_pci_setup(hose=%p, pci_regs=%p)\n", hose, pci_regs);
246
247 /* pci_process_bridge_OF_ranges() found all our addresses for us;
248 * now store them in the right places */
249 hose->cfg_addr = &pci_regs->car;
250 hose->cfg_data = hose->io_base_virt;
251
252 /* Control regs */
253 tmp = in_be32(&pci_regs->scr);
254 tmp |= PCI_COMMAND_MASTER | PCI_COMMAND_MEMORY;
255 out_be32(&pci_regs->scr, tmp);
256
257 /* Memory windows */
258 res = &hose->mem_resources[0];
259 if (res->flags) {
260 pr_debug("mem_resource[0] = "
261 "{.start=%llx, .end=%llx, .flags=%llx}\n",
262 (unsigned long long)res->start,
263 (unsigned long long)res->end,
264 (unsigned long long)res->flags);
265 out_be32(&pci_regs->iw0btar,
266 MPC52xx_PCI_IWBTAR_TRANSLATION(res->start, res->start,
267 resource_size(res)));
268 iwcr0 = MPC52xx_PCI_IWCR_ENABLE | MPC52xx_PCI_IWCR_MEM;
269 if (res->flags & IORESOURCE_PREFETCH)
270 iwcr0 |= MPC52xx_PCI_IWCR_READ_MULTI;
271 else
272 iwcr0 |= MPC52xx_PCI_IWCR_READ;
273 }
274
275 res = &hose->mem_resources[1];
276 if (res->flags) {
277 pr_debug("mem_resource[1] = {.start=%x, .end=%x, .flags=%lx}\n",
278 res->start, res->end, res->flags);
279 out_be32(&pci_regs->iw1btar,
280 MPC52xx_PCI_IWBTAR_TRANSLATION(res->start, res->start,
281 resource_size(res)));
282 iwcr1 = MPC52xx_PCI_IWCR_ENABLE | MPC52xx_PCI_IWCR_MEM;
283 if (res->flags & IORESOURCE_PREFETCH)
284 iwcr1 |= MPC52xx_PCI_IWCR_READ_MULTI;
285 else
286 iwcr1 |= MPC52xx_PCI_IWCR_READ;
287 }
288
289 /* IO resources */
290 res = &hose->io_resource;
291 if (!res) {
292 printk(KERN_ERR "%s: Didn't find IO resources\n", __FILE__);
293 return;
294 }
295 pr_debug(".io_resource={.start=%llx,.end=%llx,.flags=%llx} "
296 ".io_base_phys=0x%p\n",
297 (unsigned long long)res->start,
298 (unsigned long long)res->end,
299 (unsigned long long)res->flags, (void*)hose->io_base_phys);
300 out_be32(&pci_regs->iw2btar,
301 MPC52xx_PCI_IWBTAR_TRANSLATION(hose->io_base_phys,
302 res->start,
303 resource_size(res)));
304 iwcr2 = MPC52xx_PCI_IWCR_ENABLE | MPC52xx_PCI_IWCR_IO;
305
306 /* Set all the IWCR fields at once; they're in the same reg */
307 out_be32(&pci_regs->iwcr, MPC52xx_PCI_IWCR_PACK(iwcr0, iwcr1, iwcr2));
308
309 /* Map IMMR onto PCI bus */
310 pci_phys &= 0xfffc0000; /* bar0 has only 14 significant bits */
311 out_be32(&pci_regs->tbatr0, MPC52xx_PCI_TBATR_ENABLE | pci_phys);
312 out_be32(&pci_regs->bar0, PCI_BASE_ADDRESS_MEM_PREFETCH | pci_phys);
313
314 /* Map memory onto PCI bus */
315 out_be32(&pci_regs->tbatr1, MPC52xx_PCI_TBATR_ENABLE);
316 out_be32(&pci_regs->bar1, PCI_BASE_ADDRESS_MEM_PREFETCH);
317
318 out_be32(&pci_regs->tcr, MPC52xx_PCI_TCR_LD | MPC52xx_PCI_TCR_WCT8);
319
320 tmp = in_be32(&pci_regs->gscr);
321 #if 0
322 /* Reset the exteral bus ( internal PCI controller is NOT reset ) */
323 /* Not necessary and can be a bad thing if for example the bootloader
324 is displaying a splash screen or ... Just left here for
325 documentation purpose if anyone need it */
326 out_be32(&pci_regs->gscr, tmp | MPC52xx_PCI_GSCR_PR);
327 udelay(50);
328 #endif
329
330 /* Make sure the PCI bridge is out of reset */
331 out_be32(&pci_regs->gscr, tmp & ~MPC52xx_PCI_GSCR_PR);
332 }
333
334 static void
mpc52xx_pci_fixup_resources(struct pci_dev * dev)335 mpc52xx_pci_fixup_resources(struct pci_dev *dev)
336 {
337 int i;
338
339 pr_debug("mpc52xx_pci_fixup_resources() %.4x:%.4x\n",
340 dev->vendor, dev->device);
341
342 /* We don't rely on boot loader for PCI and resets all
343 devices */
344 for (i = 0; i < DEVICE_COUNT_RESOURCE; i++) {
345 struct resource *res = &dev->resource[i];
346 if (res->end > res->start) { /* Only valid resources */
347 res->end -= res->start;
348 res->start = 0;
349 res->flags |= IORESOURCE_UNSET;
350 }
351 }
352
353 /* The PCI Host bridge of MPC52xx has a prefetch memory resource
354 fixed to 1Gb. Doesn't fit in the resource system so we remove it */
355 if ( (dev->vendor == PCI_VENDOR_ID_MOTOROLA) &&
356 ( dev->device == PCI_DEVICE_ID_MOTOROLA_MPC5200
357 || dev->device == PCI_DEVICE_ID_MOTOROLA_MPC5200B) ) {
358 struct resource *res = &dev->resource[1];
359 res->start = res->end = res->flags = 0;
360 }
361 }
362
363 int __init
mpc52xx_add_bridge(struct device_node * node)364 mpc52xx_add_bridge(struct device_node *node)
365 {
366 int len;
367 struct mpc52xx_pci __iomem *pci_regs;
368 struct pci_controller *hose;
369 const int *bus_range;
370 struct resource rsrc;
371
372 pr_debug("Adding MPC52xx PCI host bridge %pOF\n", node);
373
374 pci_add_flags(PCI_REASSIGN_ALL_BUS);
375
376 if (of_address_to_resource(node, 0, &rsrc) != 0) {
377 printk(KERN_ERR "Can't get %pOF resources\n", node);
378 return -EINVAL;
379 }
380
381 bus_range = of_get_property(node, "bus-range", &len);
382 if (bus_range == NULL || len < 2 * sizeof(int)) {
383 printk(KERN_WARNING "Can't get %pOF bus-range, assume bus 0\n",
384 node);
385 bus_range = NULL;
386 }
387
388 /* There are some PCI quirks on the 52xx, register the hook to
389 * fix them. */
390 ppc_md.pcibios_fixup_resources = mpc52xx_pci_fixup_resources;
391
392 /* Alloc and initialize the pci controller. Values in the device
393 * tree are needed to configure the 52xx PCI controller. Rather
394 * than parse the tree here, let pci_process_bridge_OF_ranges()
395 * do it for us and extract the values after the fact */
396 hose = pcibios_alloc_controller(node);
397 if (!hose)
398 return -ENOMEM;
399
400 hose->first_busno = bus_range ? bus_range[0] : 0;
401 hose->last_busno = bus_range ? bus_range[1] : 0xff;
402
403 hose->ops = &mpc52xx_pci_ops;
404
405 pci_regs = ioremap(rsrc.start, resource_size(&rsrc));
406 if (!pci_regs)
407 return -ENOMEM;
408
409 pci_process_bridge_OF_ranges(hose, node, 1);
410
411 /* Finish setting up PCI using values obtained by
412 * pci_proces_bridge_OF_ranges */
413 mpc52xx_pci_setup(hose, pci_regs, rsrc.start);
414
415 return 0;
416 }
417
mpc52xx_setup_pci(void)418 void __init mpc52xx_setup_pci(void)
419 {
420 struct device_node *pci;
421
422 pci = of_find_matching_node(NULL, mpc52xx_pci_ids);
423 if (!pci)
424 return;
425
426 mpc52xx_add_bridge(pci);
427 of_node_put(pci);
428 }
429