2 * Low-Level PCI Support for the SH7751
4 * Dustin McIntire (dustin@sensoria.com)
5 * Derived from arch/i386/kernel/pci-*.c which bore the message:
6 * (c) 1999--2000 Martin Mares <mj@ucw.cz>
8 * Ported to the new API by Paul Mundt <lethal@linux-sh.org>
9 * With cleanup by Paul van Gool <pvangool@mimotech.com>
11 * May be copied or modified under the terms of the GNU General Public
12 * License. See linux/COPYING for more information.
18 #include <linux/types.h>
19 #include <linux/kernel.h>
20 #include <linux/init.h>
21 #include <linux/pci.h>
22 #include <linux/sched.h>
23 #include <linux/ioport.h>
24 #include <linux/errno.h>
25 #include <linux/irq.h>
26 #include <linux/delay.h>
28 #include <asm/machvec.h>
30 #include "pci-sh7751.h"
32 static unsigned int pci_probe = PCI_PROBE_CONF1;
33 extern int pci_fixup_pcic(void);
35 void pcibios_fixup_irqs(void) __attribute__ ((weak));
38 * Direct access to PCI hardware...
41 #define CONFIG_CMD(bus, devfn, where) (0x80000000 | (bus->number << 16) | (devfn << 8) | (where & ~3))
44 * Functions for accessing PCI configuration space with type 1 accesses
46 static int sh7751_pci_read(struct pci_bus *bus, unsigned int devfn,
47 int where, int size, u32 *val)
53 * PCIPDR may only be accessed as 32 bit words,
54 * so we must do byte alignment by hand
56 local_irq_save(flags);
57 outl(CONFIG_CMD(bus,devfn,where), PCI_REG(SH7751_PCIPAR));
58 data = inl(PCI_REG(SH7751_PCIPDR));
59 local_irq_restore(flags);
63 *val = (data >> ((where & 3) << 3)) & 0xff;
66 *val = (data >> ((where & 2) << 3)) & 0xffff;
72 return PCIBIOS_FUNC_NOT_SUPPORTED;
75 return PCIBIOS_SUCCESSFUL;
79 * Since SH7751 only does 32bit access we'll have to do a read,
80 * mask,write operation.
81 * We'll allow an odd byte offset, though it should be illegal.
83 static int sh7751_pci_write(struct pci_bus *bus, unsigned int devfn,
84 int where, int size, u32 val)
90 local_irq_save(flags);
91 outl(CONFIG_CMD(bus,devfn,where), PCI_REG(SH7751_PCIPAR));
92 data = inl(PCI_REG(SH7751_PCIPDR));
93 local_irq_restore(flags);
97 shift = (where & 3) << 3;
98 data &= ~(0xff << shift);
99 data |= ((val & 0xff) << shift);
102 shift = (where & 2) << 3;
103 data &= ~(0xffff << shift);
104 data |= ((val & 0xffff) << shift);
110 return PCIBIOS_FUNC_NOT_SUPPORTED;
113 outl(data, PCI_REG(SH7751_PCIPDR));
115 return PCIBIOS_SUCCESSFUL;
120 struct pci_ops sh7751_pci_ops = {
121 .read = sh7751_pci_read,
122 .write = sh7751_pci_write,
125 static int __init pci_check_direct(void)
127 unsigned int tmp, id;
129 /* check for SH7751/SH7751R hardware */
130 id = inl(SH7751_PCIREG_BASE+SH7751_PCICONF0);
131 if (id != ((SH7751_DEVICE_ID << 16) | SH7751_VENDOR_ID) &&
132 id != ((SH7751R_DEVICE_ID << 16) | SH7751_VENDOR_ID)) {
133 pr_debug("PCI: This is not an SH7751(R) (%x)\n", id);
138 * Check if configuration works.
140 if (pci_probe & PCI_PROBE_CONF1) {
141 tmp = inl (PCI_REG(SH7751_PCIPAR));
142 outl (0x80000000, PCI_REG(SH7751_PCIPAR));
143 if (inl (PCI_REG(SH7751_PCIPAR)) == 0x80000000) {
144 outl (tmp, PCI_REG(SH7751_PCIPAR));
145 printk(KERN_INFO "PCI: Using configuration type 1\n");
146 request_region(PCI_REG(SH7751_PCIPAR), 8, "PCI conf1");
149 outl (tmp, PCI_REG(SH7751_PCIPAR));
152 pr_debug("PCI: pci_check_direct failed\n");
156 /***************************************************************************************/
159 * Handle bus scanning and fixups ....
162 static void __init pci_fixup_ide_bases(struct pci_dev *d)
167 * PCI IDE controllers use non-standard I/O port decoding, respect it.
169 if ((d->class >> 8) != PCI_CLASS_STORAGE_IDE)
171 pr_debug("PCI: IDE base address fixup for %s\n", pci_name(d));
173 struct resource *r = &d->resource[i];
174 if ((r->start & ~0x80) == 0x374) {
181 DECLARE_PCI_FIXUP_HEADER(PCI_ANY_ID, PCI_ANY_ID, pci_fixup_ide_bases);
184 * Called after each bus is probed, but before its children
188 void __init pcibios_fixup_bus(struct pci_bus *b)
190 pci_read_bridge_bases(b);
194 * Initialization. Try all known PCI access methods. Note that we support
195 * using both PCI BIOS and direct access: in such cases, we use I/O ports
196 * to access config space.
198 * Note that the platform specific initialization (BSC registers, and memory
199 * space mapping) will be called via the machine vectors (sh_mv.mv_pci_init()) if it
200 * exitst and via the platform defined function pcibios_init_platform().
201 * See pci_bigsur.c for implementation;
203 * The BIOS version of the pci functions is not yet implemented but it is left
204 * in for completeness. Currently an error will be genereated at compile time.
207 static int __init sh7751_pci_init(void)
211 pr_debug("PCI: Starting intialization.\n");
212 if ((ret = pci_check_direct()) != 0)
215 return pcibios_init_platform();
218 subsys_initcall(sh7751_pci_init);
220 static int __init __area_sdram_check(unsigned int area)
224 word = inl(SH7751_BCR1);
225 /* check BCR for SDRAM in area */
226 if(((word >> area) & 1) == 0) {
227 printk("PCI: Area %d is not configured for SDRAM. BCR1=0x%x\n",
231 outl(word, PCI_REG(SH7751_PCIBCR1));
233 word = (u16)inw(SH7751_BCR2);
234 /* check BCR2 for 32bit SDRAM interface*/
235 if(((word >> (area << 1)) & 0x3) != 0x3) {
236 printk("PCI: Area %d is not 32 bit SDRAM. BCR2=0x%x\n",
240 outl(word, PCI_REG(SH7751_PCIBCR2));
245 int __init sh7751_pcic_init(struct sh7751_pci_address_map *map)
250 /* Set the BCR's to enable PCI access */
251 reg = inl(SH7751_BCR1);
253 outl(reg, SH7751_BCR1);
255 /* Turn the clocks back on (not done in reset)*/
256 outl(0, PCI_REG(SH7751_PCICLKR));
257 /* Clear Powerdown IRQ's (not done in reset) */
258 word = SH7751_PCIPINT_D3 | SH7751_PCIPINT_D0;
259 outl(word, PCI_REG(SH7751_PCIPINT));
262 * This code is unused for some boards as it is done in the
263 * bootloader and doing it here means the MAC addresses loaded
264 * by the bootloader get lost.
266 if (!(map->flags & SH7751_PCIC_NO_RESET)) {
267 /* toggle PCI reset pin */
268 word = SH7751_PCICR_PREFIX | SH7751_PCICR_PRST;
269 outl(word,PCI_REG(SH7751_PCICR));
270 /* Wait for a long time... not 1 sec. but long enough */
272 word = SH7751_PCICR_PREFIX;
273 outl(word,PCI_REG(SH7751_PCICR));
276 /* set the command/status bits to:
277 * Wait Cycle Control + Parity Enable + Bus Master +
280 word = SH7751_PCICONF1_WCC | SH7751_PCICONF1_PER |
281 SH7751_PCICONF1_BUM | SH7751_PCICONF1_MES;
282 outl(word, PCI_REG(SH7751_PCICONF1));
284 /* define this host as the host bridge */
285 word = SH7751_PCI_HOST_BRIDGE << 24;
286 outl(word, PCI_REG(SH7751_PCICONF2));
288 /* Set IO and Mem windows to local address
289 * Make PCI and local address the same for easy 1 to 1 mapping
290 * Window0 = map->window0.size @ non-cached area base = SDRAM
291 * Window1 = map->window1.size @ cached area base = SDRAM
293 word = map->window0.size - 1;
294 outl(word, PCI_REG(SH7751_PCILSR0));
295 word = map->window1.size - 1;
296 outl(word, PCI_REG(SH7751_PCILSR1));
297 /* Set the values on window 0 PCI config registers */
298 word = P2SEGADDR(map->window0.base);
299 outl(word, PCI_REG(SH7751_PCILAR0));
300 outl(word, PCI_REG(SH7751_PCICONF5));
301 /* Set the values on window 1 PCI config registers */
302 word = PHYSADDR(map->window1.base);
303 outl(word, PCI_REG(SH7751_PCILAR1));
304 outl(word, PCI_REG(SH7751_PCICONF6));
306 /* Set the local 16MB PCI memory space window to
307 * the lowest PCI mapped address
309 word = PCIBIOS_MIN_MEM & SH7751_PCIMBR_MASK;
310 PCIDBG(2,"PCI: Setting upper bits of Memory window to 0x%x\n", word);
311 outl(word , PCI_REG(SH7751_PCIMBR));
313 /* Map IO space into PCI IO window
314 * The IO window is 64K-PCIBIOS_MIN_IO in size
315 * IO addresses will be translated to the
316 * PCI IO window base address
318 PCIDBG(3,"PCI: Mapping IO address 0x%x - 0x%x to base 0x%x\n", PCIBIOS_MIN_IO,
319 (64*1024), SH7751_PCI_IO_BASE+PCIBIOS_MIN_IO);
322 * XXX: For now, leave this board-specific. In the event we have other
323 * boards that need to do similar work, this can be wrapped.
325 #ifdef CONFIG_SH_BIGSUR
326 bigsur_port_map(PCIBIOS_MIN_IO, (64*1024), SH7751_PCI_IO_BASE+PCIBIOS_MIN_IO,0);
329 /* Make sure the MSB's of IO window are set to access PCI space correctly */
330 word = PCIBIOS_MIN_IO & SH7751_PCIIOBR_MASK;
331 PCIDBG(2,"PCI: Setting upper bits of IO window to 0x%x\n", word);
332 outl(word, PCI_REG(SH7751_PCIIOBR));
334 /* Set PCI WCRx, BCRx's, copy from BSC locations */
336 /* check BCR for SDRAM in specified area */
337 switch (map->window0.base) {
338 case SH7751_CS0_BASE_ADDR: word = __area_sdram_check(0); break;
339 case SH7751_CS1_BASE_ADDR: word = __area_sdram_check(1); break;
340 case SH7751_CS2_BASE_ADDR: word = __area_sdram_check(2); break;
341 case SH7751_CS3_BASE_ADDR: word = __area_sdram_check(3); break;
342 case SH7751_CS4_BASE_ADDR: word = __area_sdram_check(4); break;
343 case SH7751_CS5_BASE_ADDR: word = __area_sdram_check(5); break;
344 case SH7751_CS6_BASE_ADDR: word = __area_sdram_check(6); break;
350 /* configure the wait control registers */
351 word = inl(SH7751_WCR1);
352 outl(word, PCI_REG(SH7751_PCIWCR1));
353 word = inl(SH7751_WCR2);
354 outl(word, PCI_REG(SH7751_PCIWCR2));
355 word = inl(SH7751_WCR3);
356 outl(word, PCI_REG(SH7751_PCIWCR3));
357 word = inl(SH7751_MCR);
358 outl(word, PCI_REG(SH7751_PCIMCR));
360 /* NOTE: I'm ignoring the PCI error IRQs for now..
361 * TODO: add support for the internal error interrupts and
365 #ifdef CONFIG_SH_RTS7751R2D
369 /* SH7751 init done, set central function init complete */
370 /* use round robin mode to stop a device starving/overruning */
371 word = SH7751_PCICR_PREFIX | SH7751_PCICR_CFIN | SH7751_PCICR_ARBM;
372 outl(word,PCI_REG(SH7751_PCICR));
377 char * __init pcibios_setup(char *str)
379 if (!strcmp(str, "off")) {
390 static u8 __init sh7751_no_swizzle(struct pci_dev *dev, u8 *pin)
393 return PCI_SLOT(dev->devfn);
396 static int sh7751_pci_lookup_irq(struct pci_dev *dev, u8 slot, u8 pin)
400 /* now lookup the actual IRQ on a platform specific basis (pci-'platform'.c) */
401 irq = pcibios_map_platform_irq(slot,pin);
403 pr_debug("PCI: Error mapping IRQ on device %s\n", pci_name(dev));
407 pr_debug("Setting IRQ for slot %s to %d\n", pci_name(dev), irq);
412 void __init pcibios_fixup_irqs(void)
414 pci_fixup_irqs(sh7751_no_swizzle, sh7751_pci_lookup_irq);