2 * arch/arm/plat-iop/pci.c
4 * PCI support for the Intel IOP32X and IOP33X processors
6 * Author: Rory Bolt <rorybolt@pacbell.net>
7 * Copyright (C) 2002 Rory Bolt
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License version 2 as
11 * published by the Free Software Foundation.
14 #include <linux/kernel.h>
15 #include <linux/pci.h>
16 #include <linux/slab.h>
18 #include <linux/init.h>
19 #include <linux/ioport.h>
22 #include <asm/signal.h>
23 #include <asm/system.h>
24 #include <asm/hardware.h>
25 #include <asm/mach/pci.h>
26 #include <asm/hardware/iop3xx.h>
27 #include <asm/mach-types.h>
32 #define DBG(x...) printk(x)
34 #define DBG(x...) do { } while (0)
38 * This routine builds either a type0 or type1 configuration command. If the
39 * bus is on the 803xx then a type0 made, else a type1 is created.
41 static u32 iop3xx_cfg_address(struct pci_bus *bus, int devfn, int where)
43 struct pci_sys_data *sys = bus->sysdata;
46 if (sys->busnr == bus->number)
47 addr = 1 << (PCI_SLOT(devfn) + 16) | (PCI_SLOT(devfn) << 11);
49 addr = bus->number << 16 | PCI_SLOT(devfn) << 11 | 1;
51 addr |= PCI_FUNC(devfn) << 8 | (where & ~3);
57 * This routine checks the status of the last configuration cycle. If an error
58 * was detected it returns a 1, else it returns a 0. The errors being checked
59 * are parity, master abort, target abort (master and target). These types of
60 * errors occur during a config cycle where there is no device, like during
61 * the discovery stage.
63 static int iop3xx_pci_status(void)
69 * Check the status registers.
71 status = *IOP3XX_ATUSR;
72 if (status & 0xf900) {
73 DBG("\t\t\tPCI: P0 - status = 0x%08x\n", status);
74 *IOP3XX_ATUSR = status & 0xf900;
78 status = *IOP3XX_ATUISR;
79 if (status & 0x679f) {
80 DBG("\t\t\tPCI: P1 - status = 0x%08x\n", status);
81 *IOP3XX_ATUISR = status & 0x679f;
89 * Simply write the address register and read the configuration
90 * data. Note that the 4 nops ensure that we are able to handle
91 * a delayed abort (in theory.)
93 static u32 iop3xx_read(unsigned long addr)
105 : "r" (addr), "r" (IOP3XX_OCCAR), "r" (IOP3XX_OCCDR));
111 * The read routines must check the error status of the last configuration
112 * cycle. If there was an error, the routine returns all hex f's.
115 iop3xx_read_config(struct pci_bus *bus, unsigned int devfn, int where,
116 int size, u32 *value)
118 unsigned long addr = iop3xx_cfg_address(bus, devfn, where);
119 u32 val = iop3xx_read(addr) >> ((where & 3) * 8);
121 if (iop3xx_pci_status())
126 return PCIBIOS_SUCCESSFUL;
130 iop3xx_write_config(struct pci_bus *bus, unsigned int devfn, int where,
133 unsigned long addr = iop3xx_cfg_address(bus, devfn, where);
137 val = iop3xx_read(addr);
138 if (iop3xx_pci_status())
139 return PCIBIOS_SUCCESSFUL;
141 where = (where & 3) * 8;
144 val &= ~(0xff << where);
146 val &= ~(0xffff << where);
148 *IOP3XX_OCCDR = val | value << where;
158 : "r" (value), "r" (addr),
159 "r" (IOP3XX_OCCAR), "r" (IOP3XX_OCCDR));
162 return PCIBIOS_SUCCESSFUL;
165 static struct pci_ops iop3xx_ops = {
166 .read = iop3xx_read_config,
167 .write = iop3xx_write_config,
171 * When a PCI device does not exist during config cycles, the 80200 gets a
172 * bus error instead of returning 0xffffffff. This handler simply returns.
175 iop3xx_pci_abort(unsigned long addr, unsigned int fsr, struct pt_regs *regs)
177 DBG("PCI abort: address = 0x%08lx fsr = 0x%03x PC = 0x%08lx LR = 0x%08lx\n",
178 addr, fsr, regs->ARM_pc, regs->ARM_lr);
181 * If it was an imprecise abort, then we need to correct the
182 * return address to be _after_ the instruction.
190 int iop3xx_pci_setup(int nr, struct pci_sys_data *sys)
192 struct resource *res;
197 res = kzalloc(2 * sizeof(struct resource), GFP_KERNEL);
199 panic("PCI: unable to alloc resources");
201 res[0].start = IOP3XX_PCI_LOWER_IO_PA;
202 res[0].end = IOP3XX_PCI_LOWER_IO_PA + IOP3XX_PCI_IO_WINDOW_SIZE - 1;
203 res[0].name = "IOP3XX PCI I/O Space";
204 res[0].flags = IORESOURCE_IO;
205 request_resource(&ioport_resource, &res[0]);
207 res[1].start = IOP3XX_PCI_LOWER_MEM_PA;
208 res[1].end = IOP3XX_PCI_LOWER_MEM_PA + IOP3XX_PCI_MEM_WINDOW_SIZE - 1;
209 res[1].name = "IOP3XX PCI Memory Space";
210 res[1].flags = IORESOURCE_MEM;
211 request_resource(&iomem_resource, &res[1]);
214 * Use whatever translation is already setup.
216 sys->mem_offset = IOP3XX_PCI_LOWER_MEM_PA - *IOP3XX_OMWTVR0;
217 sys->io_offset = IOP3XX_PCI_LOWER_IO_PA - *IOP3XX_OIOWTVR;
219 sys->resource[0] = &res[0];
220 sys->resource[1] = &res[1];
221 sys->resource[2] = NULL;
226 struct pci_bus *iop3xx_pci_scan_bus(int nr, struct pci_sys_data *sys)
228 return pci_scan_bus(sys->busnr, &iop3xx_ops, sys);
231 void __init iop3xx_atu_setup(void)
233 /* BAR 0 ( Disabled ) */
234 *IOP3XX_IAUBAR0 = 0x0;
235 *IOP3XX_IABAR0 = 0x0;
236 *IOP3XX_IATVR0 = 0x0;
239 /* BAR 1 ( Disabled ) */
240 *IOP3XX_IAUBAR1 = 0x0;
241 *IOP3XX_IABAR1 = 0x0;
244 /* BAR 2 (1:1 mapping with Physical RAM) */
245 /* Set limit and enable */
246 *IOP3XX_IALR2 = ~((u32)IOP3XX_MAX_RAM_SIZE - 1) & ~0x1;
247 *IOP3XX_IAUBAR2 = 0x0;
249 /* Align the inbound bar with the base of memory */
250 *IOP3XX_IABAR2 = PHYS_OFFSET |
251 PCI_BASE_ADDRESS_MEM_TYPE_64 |
252 PCI_BASE_ADDRESS_MEM_PREFETCH;
254 *IOP3XX_IATVR2 = PHYS_OFFSET;
256 /* Outbound window 0 */
257 *IOP3XX_OMWTVR0 = IOP3XX_PCI_LOWER_MEM_BA;
258 *IOP3XX_OUMWTVR0 = 0;
260 /* Outbound window 1 */
261 *IOP3XX_OMWTVR1 = IOP3XX_PCI_LOWER_MEM_BA + IOP3XX_PCI_MEM_WINDOW_SIZE;
262 *IOP3XX_OUMWTVR1 = 0;
264 /* BAR 3 ( Disabled ) */
265 *IOP3XX_IAUBAR3 = 0x0;
266 *IOP3XX_IABAR3 = 0x0;
267 *IOP3XX_IATVR3 = 0x0;
272 *IOP3XX_OIOWTVR = IOP3XX_PCI_LOWER_IO_BA;
274 /* Enable inbound and outbound cycles
276 *IOP3XX_ATUCMD |= PCI_COMMAND_MEMORY | PCI_COMMAND_MASTER |
277 PCI_COMMAND_PARITY | PCI_COMMAND_SERR;
278 *IOP3XX_ATUCR |= IOP3XX_ATUCR_OUT_EN;
281 void __init iop3xx_atu_disable(void)
286 /* wait for cycles to quiesce */
287 while (*IOP3XX_PCSR & (IOP3XX_PCSR_OUT_Q_BUSY |
288 IOP3XX_PCSR_IN_Q_BUSY))
291 /* BAR 0 ( Disabled ) */
292 *IOP3XX_IAUBAR0 = 0x0;
293 *IOP3XX_IABAR0 = 0x0;
294 *IOP3XX_IATVR0 = 0x0;
297 /* BAR 1 ( Disabled ) */
298 *IOP3XX_IAUBAR1 = 0x0;
299 *IOP3XX_IABAR1 = 0x0;
302 /* BAR 2 ( Disabled ) */
303 *IOP3XX_IAUBAR2 = 0x0;
304 *IOP3XX_IABAR2 = 0x0;
305 *IOP3XX_IATVR2 = 0x0;
308 /* BAR 3 ( Disabled ) */
309 *IOP3XX_IAUBAR3 = 0x0;
310 *IOP3XX_IABAR3 = 0x0;
311 *IOP3XX_IATVR3 = 0x0;
314 /* Clear the outbound windows */
317 /* Outbound window 0 */
319 *IOP3XX_OUMWTVR0 = 0;
321 /* Outbound window 1 */
323 *IOP3XX_OUMWTVR1 = 0;
326 /* Flag to determine whether the ATU is initialized and the PCI bus scanned */
329 int iop3xx_get_init_atu(void) {
330 /* check if default has been overridden */
331 if (init_atu != IOP3XX_INIT_ATU_DEFAULT)
334 return IOP3XX_INIT_ATU_DISABLE;
337 static void __init iop3xx_atu_debug(void)
339 DBG("PCI: Intel IOP3xx PCI init.\n");
340 DBG("PCI: Outbound memory window 0: PCI 0x%08x%08x\n",
341 *IOP3XX_OUMWTVR0, *IOP3XX_OMWTVR0);
342 DBG("PCI: Outbound memory window 1: PCI 0x%08x%08x\n",
343 *IOP3XX_OUMWTVR1, *IOP3XX_OMWTVR1);
344 DBG("PCI: Outbound IO window: PCI 0x%08x\n",
347 DBG("PCI: Inbound memory window 0: PCI 0x%08x%08x 0x%08x -> 0x%08x\n",
348 *IOP3XX_IAUBAR0, *IOP3XX_IABAR0, *IOP3XX_IALR0, *IOP3XX_IATVR0);
349 DBG("PCI: Inbound memory window 1: PCI 0x%08x%08x 0x%08x\n",
350 *IOP3XX_IAUBAR1, *IOP3XX_IABAR1, *IOP3XX_IALR1);
351 DBG("PCI: Inbound memory window 2: PCI 0x%08x%08x 0x%08x -> 0x%08x\n",
352 *IOP3XX_IAUBAR2, *IOP3XX_IABAR2, *IOP3XX_IALR2, *IOP3XX_IATVR2);
353 DBG("PCI: Inbound memory window 3: PCI 0x%08x%08x 0x%08x -> 0x%08x\n",
354 *IOP3XX_IAUBAR3, *IOP3XX_IABAR3, *IOP3XX_IALR3, *IOP3XX_IATVR3);
356 DBG("PCI: Expansion ROM window: PCI 0x%08x%08x 0x%08x -> 0x%08x\n",
357 0, *IOP3XX_ERBAR, *IOP3XX_ERLR, *IOP3XX_ERTVR);
359 DBG("ATU: IOP3XX_ATUCMD=0x%04x\n", *IOP3XX_ATUCMD);
360 DBG("ATU: IOP3XX_ATUCR=0x%08x\n", *IOP3XX_ATUCR);
362 hook_fault_code(16+6, iop3xx_pci_abort, SIGBUS, "imprecise external abort");
365 /* for platforms that might be host-bus-adapters */
366 void __init iop3xx_pci_preinit_cond(void)
368 if (iop3xx_get_init_atu() == IOP3XX_INIT_ATU_ENABLE) {
369 iop3xx_atu_disable();
375 void __init iop3xx_pci_preinit(void)
377 iop3xx_atu_disable();
382 /* allow init_atu to be user overridden */
383 static int __init iop3xx_init_atu_setup(char *str)
385 init_atu = IOP3XX_INIT_ATU_DEFAULT;
387 while (*str != '\0') {
391 init_atu = IOP3XX_INIT_ATU_ENABLE;
395 init_atu = IOP3XX_INIT_ATU_DISABLE;
401 printk(KERN_DEBUG "\"%s\" malformed at "
414 __setup("iop3xx_init_atu", iop3xx_init_atu_setup);