2 * linux/arch/arm/mach-versatile/pci.c
4 * (C) Copyright Koninklijke Philips Electronics NV 2004. All rights reserved.
5 * You can redistribute and/or modify this software under the terms of version 2
6 * of the GNU General Public License as published by the Free Software Foundation.
7 * THIS SOFTWARE IS PROVIDED "AS IS" WITHOUT ANY WARRANTY; WITHOUT EVEN THE IMPLIED
8 * WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. See the GNU
9 * General Public License for more details.
10 * Koninklijke Philips Electronics nor its subsidiaries is obligated to provide any support for this software.
12 * ARM Versatile PCI driver.
14 * 14/04/2005 Initial version, colin.king@philips.com
17 #include <linux/config.h>
18 #include <linux/kernel.h>
19 #include <linux/pci.h>
20 #include <linux/ptrace.h>
21 #include <linux/slab.h>
22 #include <linux/ioport.h>
23 #include <linux/interrupt.h>
24 #include <linux/spinlock.h>
25 #include <linux/init.h>
27 #include <asm/hardware.h>
30 #include <asm/system.h>
31 #include <asm/mach/pci.h>
32 #include <asm/mach-types.h>
35 * these spaces are mapped using the following base registers:
37 * Usage Local Bus Memory Base/Map registers used
39 * Mem 50000000 - 5FFFFFFF LB_BASE0/LB_MAP0, non prefetch
40 * Mem 60000000 - 6FFFFFFF LB_BASE1/LB_MAP1, prefetch
41 * IO 44000000 - 4FFFFFFF LB_BASE2/LB_MAP2, IO
42 * Cfg 42000000 - 42FFFFFF PCI config
45 #define SYS_PCICTL IO_ADDRESS(VERSATILE_SYS_PCICTL)
46 #define PCI_IMAP0 IO_ADDRESS(VERSATILE_PCI_CORE_BASE+0x0)
47 #define PCI_IMAP1 IO_ADDRESS(VERSATILE_PCI_CORE_BASE+0x4)
48 #define PCI_IMAP2 IO_ADDRESS(VERSATILE_PCI_CORE_BASE+0x8)
49 #define PCI_SMAP0 IO_ADDRESS(VERSATILE_PCI_CORE_BASE+0x10)
50 #define PCI_SMAP1 IO_ADDRESS(VERSATILE_PCI_CORE_BASE+0x14)
51 #define PCI_SMAP2 IO_ADDRESS(VERSATILE_PCI_CORE_BASE+0x18)
52 #define PCI_SELFID IO_ADDRESS(VERSATILE_PCI_CORE_BASE+0xc)
54 #define DEVICE_ID_OFFSET 0x00
55 #define CSR_OFFSET 0x04
56 #define CLASS_ID_OFFSET 0x08
58 #define VP_PCI_DEVICE_ID 0x030010ee
59 #define VP_PCI_CLASS_ID 0x0b400000
61 static unsigned long pci_slot_ignore = 0;
63 static int __init versatile_pci_slot_ignore(char *str)
68 while ((retval = get_option(&str,&slot))) {
69 if ((slot < 0) || (slot > 31)) {
70 printk("Illegal slot value: %d\n",slot);
72 pci_slot_ignore |= (1 << slot);
78 __setup("pci_slot_ignore=", versatile_pci_slot_ignore);
81 static unsigned long __pci_addr(struct pci_bus *bus,
82 unsigned int devfn, int offset)
84 unsigned int busnr = bus->number;
87 * Trap out illegal values
96 return (VERSATILE_PCI_CFG_VIRT_BASE | (busnr << 16) |
97 (PCI_SLOT(devfn) << 11) | (PCI_FUNC(devfn) << 8) | offset);
100 static int versatile_read_config(struct pci_bus *bus, unsigned int devfn, int where,
103 unsigned long addr = __pci_addr(bus, devfn, where);
105 int slot = PCI_SLOT(devfn);
107 if (pci_slot_ignore & (1 << slot)) {
108 /* Ignore this slot */
123 v = __raw_readb(addr);
127 v = __raw_readl(addr & ~3);
128 if (addr & 2) v >>= 16;
134 v = __raw_readl(addr);
140 return PCIBIOS_SUCCESSFUL;
143 static int versatile_write_config(struct pci_bus *bus, unsigned int devfn, int where,
146 unsigned long addr = __pci_addr(bus, devfn, where);
147 int slot = PCI_SLOT(devfn);
149 if (pci_slot_ignore & (1 << slot)) {
150 return PCIBIOS_SUCCESSFUL;
155 __raw_writeb((u8)val, addr);
159 __raw_writew((u16)val, addr);
163 __raw_writel(val, addr);
167 return PCIBIOS_SUCCESSFUL;
170 static struct pci_ops pci_versatile_ops = {
171 .read = versatile_read_config,
172 .write = versatile_write_config,
175 static struct resource io_mem = {
176 .name = "PCI I/O space",
177 .start = VERSATILE_PCI_MEM_BASE0,
178 .end = VERSATILE_PCI_MEM_BASE0+VERSATILE_PCI_MEM_BASE0_SIZE-1,
179 .flags = IORESOURCE_IO,
182 static struct resource non_mem = {
183 .name = "PCI non-prefetchable",
184 .start = VERSATILE_PCI_MEM_BASE1,
185 .end = VERSATILE_PCI_MEM_BASE1+VERSATILE_PCI_MEM_BASE1_SIZE-1,
186 .flags = IORESOURCE_MEM,
189 static struct resource pre_mem = {
190 .name = "PCI prefetchable",
191 .start = VERSATILE_PCI_MEM_BASE2,
192 .end = VERSATILE_PCI_MEM_BASE2+VERSATILE_PCI_MEM_BASE2_SIZE-1,
193 .flags = IORESOURCE_MEM | IORESOURCE_PREFETCH,
196 static int __init pci_versatile_setup_resources(struct resource **resource)
200 ret = request_resource(&iomem_resource, &io_mem);
202 printk(KERN_ERR "PCI: unable to allocate I/O "
203 "memory region (%d)\n", ret);
206 ret = request_resource(&iomem_resource, &non_mem);
208 printk(KERN_ERR "PCI: unable to allocate non-prefetchable "
209 "memory region (%d)\n", ret);
212 ret = request_resource(&iomem_resource, &pre_mem);
214 printk(KERN_ERR "PCI: unable to allocate prefetchable "
215 "memory region (%d)\n", ret);
216 goto release_non_mem;
220 * bus->resource[0] is the IO resource for this bus
221 * bus->resource[1] is the mem resource for this bus
222 * bus->resource[2] is the prefetch mem resource for this bus
224 resource[0] = &io_mem;
225 resource[1] = &non_mem;
226 resource[2] = &pre_mem;
231 release_resource(&non_mem);
233 release_resource(&io_mem);
238 int __init pci_versatile_setup(int nr, struct pci_sys_data *sys)
247 ret = pci_versatile_setup_resources(sys->resource);
249 printk("pci_versatile_setup: resources... oops?\n");
253 printk("pci_versatile_setup: resources... nr == 0??\n");
257 __raw_writel(VERSATILE_PCI_MEM_BASE0 >> 28,PCI_IMAP0);
258 __raw_writel(VERSATILE_PCI_MEM_BASE1 >> 28,PCI_IMAP1);
259 __raw_writel(VERSATILE_PCI_MEM_BASE2 >> 28,PCI_IMAP2);
261 __raw_writel(1, SYS_PCICTL);
263 val = __raw_readl(SYS_PCICTL);
265 printk("Not plugged into PCI backplane!\n");
271 * We need to discover the PCI core first to configure itself
272 * before the main PCI probing is performed
274 for (i=0; i<32; i++) {
275 if ((__raw_readl(VERSATILE_PCI_VIRT_BASE+(i<<11)+DEVICE_ID_OFFSET) == VP_PCI_DEVICE_ID) &&
276 (__raw_readl(VERSATILE_PCI_VIRT_BASE+(i<<11)+CLASS_ID_OFFSET) == VP_PCI_CLASS_ID)) {
279 __raw_writel(myslot, PCI_SELFID);
280 val = __raw_readl(VERSATILE_PCI_CFG_VIRT_BASE+(myslot<<11)+CSR_OFFSET);
282 __raw_writel(val, VERSATILE_PCI_CFG_VIRT_BASE+(myslot<<11)+CSR_OFFSET);
288 printk("Cannot find PCI core!\n");
291 printk("PCI core found (slot %d)\n",myslot);
292 /* Do not to map Versatile FPGA PCI device
293 into memory space as we are short of
295 pci_slot_ignore |= (1 << myslot);
304 struct pci_bus *pci_versatile_scan_bus(int nr, struct pci_sys_data *sys)
306 return pci_scan_bus(sys->busnr, &pci_versatile_ops, sys);
310 * V3_LB_BASE? - local bus address
311 * V3_LB_MAP? - pci bus address
313 void __init pci_versatile_preinit(void)
317 void __init pci_versatile_postinit(void)
323 * map the specified device/slot/pin to an IRQ. Different backplanes may need to modify this.
325 static int __init versatile_map_irq(struct pci_dev *dev, u8 slot, u8 pin)
328 int devslot = PCI_SLOT(dev->devfn);
337 irq = 27 + ((slot + pin + 2) % 3); /* Fudged */
339 printk("map irq: slot %d, pin %d, devslot %d, irq: %d\n",slot,pin,devslot,irq);
344 static struct hw_pci versatile_pci __initdata = {
346 .map_irq = versatile_map_irq,
348 .setup = pci_versatile_setup,
349 .scan = pci_versatile_scan_bus,
350 .preinit = pci_versatile_preinit,
351 .postinit = pci_versatile_postinit,
354 static int __init versatile_pci_init(void)
356 pci_common_init(&versatile_pci);
360 subsys_initcall(versatile_pci_init);