2 * Copyright (C) 2000 David J. Mckay (david.mckay@st.com)
4 * May be copied or modified under the terms of the GNU General Public
5 * License. See linux/COPYING for more information.
7 * This file contains the PCI routines required for the Galileo GT6411
8 * PCI bridge as used on the Orion and Overdrive boards.
12 #include <linux/config.h>
13 #include <linux/kernel.h>
14 #include <linux/smp.h>
15 #include <linux/smp_lock.h>
16 #include <linux/init.h>
17 #include <linux/errno.h>
18 #include <linux/pci.h>
19 #include <linux/delay.h>
20 #include <linux/types.h>
21 #include <linux/ioport.h>
23 #include <asm/overdrive/overdrive.h>
24 #include <asm/overdrive/gt64111.h>
27 /* After boot, we shift the Galileo registers so that they appear
28 * in BANK6, along with IO space. This means we can have one contingous
29 * lump of PCI address space without these registers appearing in the
33 #define GT64111_BASE_ADDRESS 0xbb000000
34 #define GT64111_IO_BASE_ADDRESS 0x1000
35 /* The GT64111 registers appear at this address to the SH4 after reset */
36 #define RESET_GT64111_BASE_ADDRESS 0xb4000000
38 /* Macros used to access the Galileo registers */
39 #define RESET_GT64111_REG(x) (RESET_GT64111_BASE_ADDRESS+x)
40 #define GT64111_REG(x) (GT64111_BASE_ADDRESS+x)
42 #define RESET_GT_WRITE(x,v) writel((v),RESET_GT64111_REG(x))
44 #define RESET_GT_READ(x) readl(RESET_GT64111_REG(x))
46 #define GT_WRITE(x,v) writel((v),GT64111_REG(x))
47 #define GT_WRITE_BYTE(x,v) writeb((v),GT64111_REG(x))
48 #define GT_WRITE_SHORT(x,v) writew((v),GT64111_REG(x))
50 #define GT_READ(x) readl(GT64111_REG(x))
51 #define GT_READ_BYTE(x) readb(GT64111_REG(x))
52 #define GT_READ_SHORT(x) readw(GT64111_REG(x))
55 /* Where the various SH banks start at */
56 #define SH_BANK4_ADR 0xb0000000
57 #define SH_BANK5_ADR 0xb4000000
58 #define SH_BANK6_ADR 0xb8000000
60 /* Masks out everything but lines 28,27,26 */
61 #define BANK_SELECT_MASK 0x1c000000
63 #define SH4_TO_BANK(x) ( (x) & BANK_SELECT_MASK)
66 * Masks used for address conversaion. Bank 6 is used for IO and
67 * has all the address bits zeroed by the FPGA. Special case this
69 #define MEMORY_BANK_MASK 0x1fffffff
70 #define IO_BANK_MASK 0x03ffffff
72 /* Mark bank 6 as the bank used for IO. You can change this in the FPGA code
75 #define IO_BANK_ADR PCI_GTIO_BASE
77 /* Will select the correct mask to apply depending on the SH$ address */
78 #define SELECT_BANK_MASK(x) \
79 ( (SH4_TO_BANK(x)==SH4_TO_BANK(IO_BANK_ADR)) ? IO_BANK_MASK : MEMORY_BANK_MASK)
81 /* Converts between PCI space and P2 region */
82 #define SH4_TO_PCI(x) ((x)&SELECT_BANK_MASK(x))
84 /* Various macros for figuring out what to stick in the Galileo registers.
85 * You *really* don't want to figure this stuff out by hand, you always get
88 #define GT_MEM_LO_ADR(x) ((((unsigned)((x)&SELECT_BANK_MASK(x)))>>21)&0x7ff)
89 #define GT_MEM_HI_ADR(x) ((((unsigned)((x)&SELECT_BANK_MASK(x)))>>21)&0x7f)
90 #define GT_MEM_SUB_ADR(x) ((((unsigned)((x)&SELECT_BANK_MASK(x)))>>20)&0xff)
92 #define PROGRAM_HI_LO(block,a,s) \
93 GT_WRITE(block##_LO_DEC_ADR,GT_MEM_LO_ADR(a));\
94 GT_WRITE(block##_HI_DEC_ADR,GT_MEM_HI_ADR(a+s-1))
96 #define PROGRAM_SUB_HI_LO(block,a,s) \
97 GT_WRITE(block##_LO_DEC_ADR,GT_MEM_SUB_ADR(a));\
98 GT_WRITE(block##_HI_DEC_ADR,GT_MEM_SUB_ADR(a+s-1))
100 /* We need to set the size, and the offset register */
102 #define GT_BAR_MASK(x) ((x)&~0xfff)
104 /* Macro to set up the BAR in the Galileo. Essentially used for the DRAM */
105 #define PROGRAM_GT_BAR(block,a,s) \
106 GT_WRITE(PCI_##block##_BANK_SIZE,GT_BAR_MASK((s-1)));\
107 write_config_to_galileo(PCI_CONFIG_##block##_BASE_ADR,\
110 #define DISABLE_GT_BAR(block) \
111 GT_WRITE(PCI_##block##_BANK_SIZE,0),\
112 GT_CONFIG_WRITE(PCI_CONFIG_##block##_BASE_ADR,\
115 /* Macros to disable things we are not going to use */
116 #define DISABLE_DECODE(x) GT_WRITE(x##_LO_DEC_ADR,0x7ff);\
117 GT_WRITE(x##_HI_DEC_ADR,0x00)
119 #define DISABLE_SUB_DECODE(x) GT_WRITE(x##_LO_DEC_ADR,0xff);\
120 GT_WRITE(x##_HI_DEC_ADR,0x00)
122 static void __init reset_pci(void)
124 /* Set RESET_PCI bit high */
125 writeb(readb(OVERDRIVE_CTRL) | ENABLE_PCI_BIT, OVERDRIVE_CTRL);
128 /* Set RESET_PCI bit low */
129 writeb(readb(OVERDRIVE_CTRL) & RESET_PCI_MASK, OVERDRIVE_CTRL);
132 writeb(readb(OVERDRIVE_CTRL) | ENABLE_PCI_BIT, OVERDRIVE_CTRL);
136 static int write_config_to_galileo(int where, u32 val);
137 #define GT_CONFIG_WRITE(where,val) write_config_to_galileo(where,val)
139 #define ENABLE_PCI_DRAM
143 /* Test function to check out if the PCI DRAM is working OK */
144 static int /* __init */ test_dram(unsigned *base, unsigned size)
147 unsigned *end = (unsigned *) (((unsigned) base) + size);
150 for (p = base; p < end; p++) {
152 if (*p != 0xffffffff) {
153 printk("AAARGH -write failed!!! at %p is %x\n", p,
159 printk("AAARGH -write failed!!!\n");
164 for (p = base; p < end; p++) {
166 if (*p != (unsigned) p) {
167 printk("Failed at 0x%p, actually is 0x%x\n", p,
173 for (p = base; p < end; p++) {
174 w = ((unsigned) p & 0xffff0000);
178 for (p = base; p < end; p++) {
179 w = ((unsigned) p & 0xffff0000);
183 ("Failed at 0x%p, should be 0x%x actually is 0x%x\n",
194 /* Function to set up and initialise the galileo. This sets up the BARS,
195 * maps the DRAM into the address space etc,etc
197 int __init galileo_init(void)
201 /* Now shift the galileo regs into this block */
202 RESET_GT_WRITE(INTERNAL_SPACE_DEC,
203 GT_MEM_LO_ADR(GT64111_BASE_ADDRESS));
205 /* Should have a sanity check here, that you can read back at the new
206 * address what you just wrote
209 /* Disable decode for all regions */
210 DISABLE_DECODE(RAS10);
211 DISABLE_DECODE(RAS32);
212 DISABLE_DECODE(CS20);
214 DISABLE_DECODE(PCI_IO);
215 DISABLE_DECODE(PCI_MEM0);
216 DISABLE_DECODE(PCI_MEM1);
218 /* Disable all BARS */
219 GT_WRITE(BAR_ENABLE_ADR, 0x1ff);
220 DISABLE_GT_BAR(RAS10);
221 DISABLE_GT_BAR(RAS32);
222 DISABLE_GT_BAR(CS20);
225 /* Tell the BAR where the IO registers now are */
226 GT_CONFIG_WRITE(PCI_CONFIG_INT_REG_IO_ADR,GT_BAR_MASK(
227 (GT64111_IO_BASE_ADDRESS &
229 /* set up a 112 Mb decode */
230 PROGRAM_HI_LO(PCI_MEM0, SH_BANK4_ADR, 112 * 1024 * 1024);
232 /* Set up a 32 MB io space decode */
233 PROGRAM_HI_LO(PCI_IO, IO_BANK_ADR, 32 * 1024 * 1024);
235 #ifdef ENABLE_PCI_DRAM
236 /* Program up the DRAM configuration - there is DRAM only in bank 0 */
237 /* Now set up the DRAM decode */
238 PROGRAM_HI_LO(RAS10, PCI_DRAM_BASE, PCI_DRAM_SIZE);
239 /* And the sub decode */
240 PROGRAM_SUB_HI_LO(RAS0, PCI_DRAM_BASE, PCI_DRAM_SIZE);
242 DISABLE_SUB_DECODE(RAS1);
244 /* Set refresh rate */
245 GT_WRITE(DRAM_BANK0_PARMS, 0x3f);
246 GT_WRITE(DRAM_CFG, 0x100);
248 /* we have to lob off the top bits rememeber!! */
249 PROGRAM_GT_BAR(RAS10, SH4_TO_PCI(PCI_DRAM_BASE), PCI_DRAM_SIZE);
253 /* We are only interested in decoding RAS10 and the Galileo's internal
254 * registers (as IO) on the PCI bus
256 #ifdef ENABLE_PCI_DRAM
257 GT_WRITE(BAR_ENABLE_ADR, (~((1 << 8) | (1 << 3))) & 0x1ff);
259 GT_WRITE(BAR_ENABLE_ADR, (~(1 << 3)) & 0x1ff);
262 /* Change the class code to host bridge, it actually powers up
263 * as a memory controller
265 GT_CONFIG_WRITE(8, 0x06000011);
267 /* Allow the galileo to master the PCI bus */
268 GT_CONFIG_WRITE(PCI_COMMAND,
269 PCI_COMMAND_MEMORY | PCI_COMMAND_MASTER |
274 printk("Testing PCI DRAM - ");
275 if(test_dram(PCI_DRAM_BASE,PCI_DRAM_SIZE)) {
286 #define SET_CONFIG_BITS(bus,devfn,where)\
287 ((1<<31) | ((bus) << 16) | ((devfn) << 8) | ((where) & ~3))
289 #define CONFIG_CMD(dev, where) SET_CONFIG_BITS((dev)->bus->number,(dev)->devfn,where)
291 /* This write to the galileo config registers, unlike the functions below, can
292 * be used before the PCI subsystem has started up
294 static int __init write_config_to_galileo(int where, u32 val)
296 GT_WRITE(PCI_CFG_ADR, SET_CONFIG_BITS(0, 0, where));
298 GT_WRITE(PCI_CFG_DATA, val);
302 /* We exclude the galileo and slot 31, the galileo because I don't know how to stop
303 * the setup code shagging up the setup I have done on it, and 31 because the whole
304 * thing locks up if you try to access that slot (which doesn't exist of course anyway
307 #define EXCLUDED_DEV(dev) ((dev->bus->number==0) && ((PCI_SLOT(dev->devfn)==0) || (PCI_SLOT(dev->devfn) == 31)))
309 static int galileo_read_config_byte(struct pci_dev *dev, int where,
314 /* I suspect this doesn't work because this drives a special cycle ? */
315 if (EXCLUDED_DEV(dev)) {
317 return PCIBIOS_SUCCESSFUL;
319 /* Start the config cycle */
320 GT_WRITE(PCI_CFG_ADR, CONFIG_CMD(dev, where));
321 /* Read back the result */
322 *val = GT_READ_BYTE(PCI_CFG_DATA + (where & 3));
324 return PCIBIOS_SUCCESSFUL;
328 static int galileo_read_config_word(struct pci_dev *dev, int where,
332 if (EXCLUDED_DEV(dev)) {
334 return PCIBIOS_SUCCESSFUL;
337 GT_WRITE(PCI_CFG_ADR, CONFIG_CMD(dev, where));
338 *val = GT_READ_SHORT(PCI_CFG_DATA + (where & 2));
340 return PCIBIOS_SUCCESSFUL;
344 static int galileo_read_config_dword(struct pci_dev *dev, int where,
347 if (EXCLUDED_DEV(dev)) {
349 return PCIBIOS_SUCCESSFUL;
352 GT_WRITE(PCI_CFG_ADR, CONFIG_CMD(dev, where));
353 *val = GT_READ(PCI_CFG_DATA);
355 return PCIBIOS_SUCCESSFUL;
358 static int galileo_write_config_byte(struct pci_dev *dev, int where,
361 GT_WRITE(PCI_CFG_ADR, CONFIG_CMD(dev, where));
363 GT_WRITE_BYTE(PCI_CFG_DATA + (where & 3), val);
365 return PCIBIOS_SUCCESSFUL;
369 static int galileo_write_config_word(struct pci_dev *dev, int where,
372 GT_WRITE(PCI_CFG_ADR, CONFIG_CMD(dev, where));
374 GT_WRITE_SHORT(PCI_CFG_DATA + (where & 2), val);
376 return PCIBIOS_SUCCESSFUL;
379 static int galileo_write_config_dword(struct pci_dev *dev, int where,
382 GT_WRITE(PCI_CFG_ADR, CONFIG_CMD(dev, where));
384 GT_WRITE(PCI_CFG_DATA, val);
386 return PCIBIOS_SUCCESSFUL;
389 static struct pci_ops pci_config_ops = {
390 galileo_read_config_byte,
391 galileo_read_config_word,
392 galileo_read_config_dword,
393 galileo_write_config_byte,
394 galileo_write_config_word,
395 galileo_write_config_dword
399 /* Everything hangs off this */
400 static struct pci_bus *pci_root_bus;
403 static u8 __init no_swizzle(struct pci_dev *dev, u8 * pin)
405 return PCI_SLOT(dev->devfn);
408 static int __init map_od_irq(struct pci_dev *dev, u8 slot, u8 pin)
417 return OVERDRIVE_PCI_IRQ1;
419 /* Note this assumes you have a hacked card in slot 2 */
420 return OVERDRIVE_PCI_IRQ2;
422 return OVERDRIVE_ESS_IRQ;
424 /* printk("PCI: Unexpected IRQ mapping request for slot %d\n", slot); */
432 pcibios_fixup_pbus_ranges(struct pci_bus *bus, struct pbus_set_ranges_data *ranges)
434 ranges->io_start -= bus->resource[0]->start;
435 ranges->io_end -= bus->resource[0]->start;
436 ranges->mem_start -= bus->resource[1]->start;
437 ranges->mem_end -= bus->resource[1]->start;
440 static void __init pci_fixup_ide_bases(struct pci_dev *d)
445 * PCI IDE controllers use non-standard I/O port decoding, respect it.
447 if ((d->class >> 8) != PCI_CLASS_STORAGE_IDE)
449 printk("PCI: IDE base address fixup for %s\n", pci_name(d));
451 struct resource *r = &d->resource[i];
452 if ((r->start & ~0x80) == 0x374) {
458 DECLARE_PCI_FIXUP_HEADER(PCI_ANY_ID, PCI_ANY_ID, pci_fixup_ide_bases);
460 void __init pcibios_init(void)
462 static struct resource galio,galmem;
464 /* Allocate the registers used by the Galileo */
465 galio.flags = IORESOURCE_IO;
466 galio.name = "Galileo GT64011";
467 galmem.flags = IORESOURCE_MEM|IORESOURCE_PREFETCH;
468 galmem.name = "Galileo GT64011 DRAM";
470 allocate_resource(&ioport_resource, &galio, 256,
471 GT64111_IO_BASE_ADDRESS,GT64111_IO_BASE_ADDRESS+256, 256, NULL, NULL);
472 allocate_resource(&iomem_resource, &galmem,PCI_DRAM_SIZE,
473 PHYSADDR(PCI_DRAM_BASE), PHYSADDR(PCI_DRAM_BASE)+PCI_DRAM_SIZE,
474 PCI_DRAM_SIZE, NULL, NULL);
476 /* ok, do the scan man */
477 pci_root_bus = pci_scan_bus(0, &pci_config_ops, NULL);
479 pci_assign_unassigned_resources();
480 pci_fixup_irqs(no_swizzle, map_od_irq);
483 printk("Testing PCI DRAM - ");
484 if(test_dram(PCI_DRAM_BASE,PCI_DRAM_SIZE)) {
493 char * __init pcibios_setup(char *str)
500 int pcibios_enable_device(struct pci_dev *dev)
507 pci_read_config_word(dev, PCI_COMMAND, &cmd);
509 for (idx = 0; idx < 6; idx++) {
510 r = dev->resource + idx;
511 if (!r->start && r->end) {
513 "PCI: Device %s not available because"
514 " of resource collisions\n",
518 if (r->flags & IORESOURCE_IO)
519 cmd |= PCI_COMMAND_IO;
520 if (r->flags & IORESOURCE_MEM)
521 cmd |= PCI_COMMAND_MEMORY;
523 if (cmd != old_cmd) {
524 printk("PCI: enabling device %s (%04x -> %04x)\n",
525 pci_name(dev), old_cmd, cmd);
526 pci_write_config_word(dev, PCI_COMMAND, cmd);
532 /* We should do some optimisation work here I think. Ok for now though */
533 void __init pcibios_fixup_bus(struct pci_bus *bus)
538 void pcibios_align_resource(void *data, struct resource *res,
543 void __init pcibios_update_resource(struct pci_dev *dev, struct resource *root,
544 struct resource *res, int resource)
547 unsigned long where, size;
551 printk("PCI: Assigning %3s %08lx to %s\n",
552 res->flags & IORESOURCE_IO ? "IO" : "MEM",
553 res->start, dev->name);
555 where = PCI_BASE_ADDRESS_0 + resource * 4;
556 size = res->end - res->start;
558 pci_read_config_dword(dev, where, ®);
559 reg = (reg & size) | (((u32) (res->start - root->start)) & ~size);
560 pci_write_config_dword(dev, where, reg);
564 void __init pcibios_update_irq(struct pci_dev *dev, int irq)
566 printk("PCI: Assigning IRQ %02d to %s\n", irq, dev->name);
567 pci_write_config_byte(dev, PCI_INTERRUPT_LINE, irq);
571 * If we set up a device for bus mastering, we need to check the latency
572 * timer as certain crappy BIOSes forget to set it properly.
574 unsigned int pcibios_max_latency = 255;
576 void pcibios_set_master(struct pci_dev *dev)
579 pci_read_config_byte(dev, PCI_LATENCY_TIMER, &lat);
581 lat = (64 <= pcibios_max_latency) ? 64 : pcibios_max_latency;
582 else if (lat > pcibios_max_latency)
583 lat = pcibios_max_latency;
586 printk("PCI: Setting latency timer of device %s to %d\n", pci_name(dev), lat);
587 pci_write_config_byte(dev, PCI_LATENCY_TIMER, lat);