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>
31 #define DBG(x...) printk(x)
33 #define DBG(x...) do { } while (0)
37 * This routine builds either a type0 or type1 configuration command. If the
38 * bus is on the 803xx then a type0 made, else a type1 is created.
40 static u32 iop3xx_cfg_address(struct pci_bus *bus, int devfn, int where)
42 struct pci_sys_data *sys = bus->sysdata;
45 if (sys->busnr == bus->number)
46 addr = 1 << (PCI_SLOT(devfn) + 16) | (PCI_SLOT(devfn) << 11);
48 addr = bus->number << 16 | PCI_SLOT(devfn) << 11 | 1;
50 addr |= PCI_FUNC(devfn) << 8 | (where & ~3);
56 * This routine checks the status of the last configuration cycle. If an error
57 * was detected it returns a 1, else it returns a 0. The errors being checked
58 * are parity, master abort, target abort (master and target). These types of
59 * errors occur during a config cycle where there is no device, like during
60 * the discovery stage.
62 static int iop3xx_pci_status(void)
68 * Check the status registers.
70 status = *IOP3XX_ATUSR;
71 if (status & 0xf900) {
72 DBG("\t\t\tPCI: P0 - status = 0x%08x\n", status);
73 *IOP3XX_ATUSR = status & 0xf900;
77 status = *IOP3XX_ATUISR;
78 if (status & 0x679f) {
79 DBG("\t\t\tPCI: P1 - status = 0x%08x\n", status);
80 *IOP3XX_ATUISR = status & 0x679f;
88 * Simply write the address register and read the configuration
89 * data. Note that the 4 nops ensure that we are able to handle
90 * a delayed abort (in theory.)
92 static u32 iop3xx_read(unsigned long addr)
104 : "r" (addr), "r" (IOP3XX_OCCAR), "r" (IOP3XX_OCCDR));
110 * The read routines must check the error status of the last configuration
111 * cycle. If there was an error, the routine returns all hex f's.
114 iop3xx_read_config(struct pci_bus *bus, unsigned int devfn, int where,
115 int size, u32 *value)
117 unsigned long addr = iop3xx_cfg_address(bus, devfn, where);
118 u32 val = iop3xx_read(addr) >> ((where & 3) * 8);
120 if (iop3xx_pci_status())
125 return PCIBIOS_SUCCESSFUL;
129 iop3xx_write_config(struct pci_bus *bus, unsigned int devfn, int where,
132 unsigned long addr = iop3xx_cfg_address(bus, devfn, where);
136 val = iop3xx_read(addr);
137 if (iop3xx_pci_status())
138 return PCIBIOS_SUCCESSFUL;
140 where = (where & 3) * 8;
143 val &= ~(0xff << where);
145 val &= ~(0xffff << where);
147 *IOP3XX_OCCDR = val | value << where;
157 : "r" (value), "r" (addr),
158 "r" (IOP3XX_OCCAR), "r" (IOP3XX_OCCDR));
161 return PCIBIOS_SUCCESSFUL;
164 static struct pci_ops iop3xx_ops = {
165 .read = iop3xx_read_config,
166 .write = iop3xx_write_config,
170 * When a PCI device does not exist during config cycles, the 80200 gets a
171 * bus error instead of returning 0xffffffff. This handler simply returns.
174 iop3xx_pci_abort(unsigned long addr, unsigned int fsr, struct pt_regs *regs)
176 DBG("PCI abort: address = 0x%08lx fsr = 0x%03x PC = 0x%08lx LR = 0x%08lx\n",
177 addr, fsr, regs->ARM_pc, regs->ARM_lr);
180 * If it was an imprecise abort, then we need to correct the
181 * return address to be _after_ the instruction.
189 int iop3xx_pci_setup(int nr, struct pci_sys_data *sys)
191 struct resource *res;
196 res = kzalloc(2 * sizeof(struct resource), GFP_KERNEL);
198 panic("PCI: unable to alloc resources");
200 res[0].start = IOP3XX_PCI_LOWER_IO_PA;
201 res[0].end = IOP3XX_PCI_LOWER_IO_PA + IOP3XX_PCI_IO_WINDOW_SIZE - 1;
202 res[0].name = "IOP3XX PCI I/O Space";
203 res[0].flags = IORESOURCE_IO;
204 request_resource(&ioport_resource, &res[0]);
206 res[1].start = IOP3XX_PCI_LOWER_MEM_PA;
207 res[1].end = IOP3XX_PCI_LOWER_MEM_PA + IOP3XX_PCI_MEM_WINDOW_SIZE - 1;
208 res[1].name = "IOP3XX PCI Memory Space";
209 res[1].flags = IORESOURCE_MEM;
210 request_resource(&iomem_resource, &res[1]);
212 sys->mem_offset = IOP3XX_PCI_LOWER_MEM_PA - IOP3XX_PCI_LOWER_MEM_BA;
213 sys->io_offset = IOP3XX_PCI_LOWER_IO_PA - IOP3XX_PCI_LOWER_IO_BA;
215 sys->resource[0] = &res[0];
216 sys->resource[1] = &res[1];
217 sys->resource[2] = NULL;
222 struct pci_bus *iop3xx_pci_scan_bus(int nr, struct pci_sys_data *sys)
224 return pci_scan_bus(sys->busnr, &iop3xx_ops, sys);
227 void __init iop3xx_atu_setup(void)
229 /* BAR 0 ( Disabled ) */
230 *IOP3XX_IAUBAR0 = 0x0;
231 *IOP3XX_IABAR0 = 0x0;
232 *IOP3XX_IATVR0 = 0x0;
235 /* BAR 1 ( Disabled ) */
236 *IOP3XX_IAUBAR1 = 0x0;
237 *IOP3XX_IABAR1 = 0x0;
240 /* BAR 2 (1:1 mapping with Physical RAM) */
241 /* Set limit and enable */
242 *IOP3XX_IALR2 = ~((u32)IOP3XX_MAX_RAM_SIZE - 1) & ~0x1;
243 *IOP3XX_IAUBAR2 = 0x0;
245 /* Align the inbound bar with the base of memory */
246 *IOP3XX_IABAR2 = PHYS_OFFSET |
247 PCI_BASE_ADDRESS_MEM_TYPE_64 |
248 PCI_BASE_ADDRESS_MEM_PREFETCH;
250 *IOP3XX_IATVR2 = PHYS_OFFSET;
252 /* Outbound window 0 */
253 *IOP3XX_OMWTVR0 = IOP3XX_PCI_LOWER_MEM_PA;
254 *IOP3XX_OUMWTVR0 = 0;
256 /* Outbound window 1 */
257 *IOP3XX_OMWTVR1 = IOP3XX_PCI_LOWER_MEM_PA + IOP3XX_PCI_MEM_WINDOW_SIZE;
258 *IOP3XX_OUMWTVR1 = 0;
260 /* BAR 3 ( Disabled ) */
261 *IOP3XX_IAUBAR3 = 0x0;
262 *IOP3XX_IABAR3 = 0x0;
263 *IOP3XX_IATVR3 = 0x0;
268 *IOP3XX_OIOWTVR = IOP3XX_PCI_LOWER_IO_PA;;
270 /* Enable inbound and outbound cycles
272 *IOP3XX_ATUCMD |= PCI_COMMAND_MEMORY | PCI_COMMAND_MASTER |
273 PCI_COMMAND_PARITY | PCI_COMMAND_SERR;
274 *IOP3XX_ATUCR |= IOP3XX_ATUCR_OUT_EN;
277 void __init iop3xx_atu_disable(void)
282 /* wait for cycles to quiesce */
283 while (*IOP3XX_PCSR & (IOP3XX_PCSR_OUT_Q_BUSY |
284 IOP3XX_PCSR_IN_Q_BUSY))
287 /* BAR 0 ( Disabled ) */
288 *IOP3XX_IAUBAR0 = 0x0;
289 *IOP3XX_IABAR0 = 0x0;
290 *IOP3XX_IATVR0 = 0x0;
293 /* BAR 1 ( Disabled ) */
294 *IOP3XX_IAUBAR1 = 0x0;
295 *IOP3XX_IABAR1 = 0x0;
298 /* BAR 2 ( Disabled ) */
299 *IOP3XX_IAUBAR2 = 0x0;
300 *IOP3XX_IABAR2 = 0x0;
301 *IOP3XX_IATVR2 = 0x0;
304 /* BAR 3 ( Disabled ) */
305 *IOP3XX_IAUBAR3 = 0x0;
306 *IOP3XX_IABAR3 = 0x0;
307 *IOP3XX_IATVR3 = 0x0;
310 /* Clear the outbound windows */
313 /* Outbound window 0 */
315 *IOP3XX_OUMWTVR0 = 0;
317 /* Outbound window 1 */
319 *IOP3XX_OUMWTVR1 = 0;
322 /* Flag to determine whether the ATU is initialized and the PCI bus scanned */
325 void __init iop3xx_pci_preinit(void)
327 if (iop3xx_get_init_atu() == IOP3XX_INIT_ATU_ENABLE) {
328 iop3xx_atu_disable();
332 DBG("PCI: Intel 803xx PCI init code.\n");
333 DBG("ATU: IOP3XX_ATUCMD=0x%04x\n", *IOP3XX_ATUCMD);
334 DBG("ATU: IOP3XX_OMWTVR0=0x%04x, IOP3XX_OIOWTVR=0x%04x\n",
337 DBG("ATU: IOP3XX_ATUCR=0x%08x\n", *IOP3XX_ATUCR);
338 DBG("ATU: IOP3XX_IABAR0=0x%08x IOP3XX_IALR0=0x%08x IOP3XX_IATVR0=%08x\n",
339 *IOP3XX_IABAR0, *IOP3XX_IALR0, *IOP3XX_IATVR0);
340 DBG("ATU: IOP3XX_OMWTVR0=0x%08x\n", *IOP3XX_OMWTVR0);
341 DBG("ATU: IOP3XX_IABAR1=0x%08x IOP3XX_IALR1=0x%08x\n",
342 *IOP3XX_IABAR1, *IOP3XX_IALR1);
343 DBG("ATU: IOP3XX_ERBAR=0x%08x IOP3XX_ERLR=0x%08x IOP3XX_ERTVR=%08x\n",
344 *IOP3XX_ERBAR, *IOP3XX_ERLR, *IOP3XX_ERTVR);
345 DBG("ATU: IOP3XX_IABAR2=0x%08x IOP3XX_IALR2=0x%08x IOP3XX_IATVR2=%08x\n",
346 *IOP3XX_IABAR2, *IOP3XX_IALR2, *IOP3XX_IATVR2);
347 DBG("ATU: IOP3XX_IABAR3=0x%08x IOP3XX_IALR3=0x%08x IOP3XX_IATVR3=%08x\n",
348 *IOP3XX_IABAR3, *IOP3XX_IALR3, *IOP3XX_IATVR3);
350 hook_fault_code(16+6, iop3xx_pci_abort, SIGBUS, "imprecise external abort");
353 /* allow init_atu to be user overridden */
354 static int __init iop3xx_init_atu_setup(char *str)
356 init_atu = IOP3XX_INIT_ATU_DEFAULT;
358 while (*str != '\0') {
362 init_atu = IOP3XX_INIT_ATU_ENABLE;
366 init_atu = IOP3XX_INIT_ATU_DISABLE;
372 printk(KERN_DEBUG "\"%s\" malformed at "
385 __setup("iop3xx_init_atu", iop3xx_init_atu_setup);