2 * arch/ppc/syslib/mpc52xx_pci.c
4 * PCI code for the Freescale MPC52xx embedded CPU.
7 * Maintainer : Sylvain Munaut <tnt@246tNt.com>
9 * Copyright (C) 2004 Sylvain Munaut <tnt@246tNt.com>
11 * This file is licensed under the terms of the GNU General Public License
12 * version 2. This program is licensed "as is" without any warranty of any
13 * kind, whether express or implied.
16 #include <linux/config.h>
20 #include <asm/mpc52xx.h>
21 #include "mpc52xx_pci.h"
23 #include <asm/delay.h>
27 mpc52xx_pci_read_config(struct pci_bus *bus, unsigned int devfn,
28 int offset, int len, u32 *val)
30 struct pci_controller *hose = bus->sysdata;
33 if (ppc_md.pci_exclude_device)
34 if (ppc_md.pci_exclude_device(bus->number, devfn))
35 return PCIBIOS_DEVICE_NOT_FOUND;
37 out_be32(hose->cfg_addr,
39 ((bus->number - hose->bus_offset) << 16) |
43 value = in_le32(hose->cfg_data);
46 value >>= ((offset & 0x3) << 3);
47 value &= 0xffffffff >> (32 - (len << 3));
52 out_be32(hose->cfg_addr, 0);
54 return PCIBIOS_SUCCESSFUL;
58 mpc52xx_pci_write_config(struct pci_bus *bus, unsigned int devfn,
59 int offset, int len, u32 val)
61 struct pci_controller *hose = bus->sysdata;
64 if (ppc_md.pci_exclude_device)
65 if (ppc_md.pci_exclude_device(bus->number, devfn))
66 return PCIBIOS_DEVICE_NOT_FOUND;
68 out_be32(hose->cfg_addr,
70 ((bus->number - hose->bus_offset) << 16) |
75 value = in_le32(hose->cfg_data);
77 offset = (offset & 0x3) << 3;
78 mask = (0xffffffff >> (32 - (len << 3)));
82 val = value | ((val << offset) & mask);
85 out_le32(hose->cfg_data, val);
87 out_be32(hose->cfg_addr, 0);
89 return PCIBIOS_SUCCESSFUL;
92 static struct pci_ops mpc52xx_pci_ops = {
93 .read = mpc52xx_pci_read_config,
94 .write = mpc52xx_pci_write_config
99 mpc52xx_pci_setup(struct mpc52xx_pci __iomem *pci_regs)
102 /* Setup control regs */
103 /* Nothing to do afaik */
106 out_be32(&pci_regs->iw0btar, MPC52xx_PCI_IWBTAR_TRANSLATION(
107 MPC52xx_PCI_MEM_START + MPC52xx_PCI_MEM_OFFSET,
108 MPC52xx_PCI_MEM_START,
109 MPC52xx_PCI_MEM_SIZE ));
111 out_be32(&pci_regs->iw1btar, MPC52xx_PCI_IWBTAR_TRANSLATION(
112 MPC52xx_PCI_MMIO_START + MPC52xx_PCI_MEM_OFFSET,
113 MPC52xx_PCI_MMIO_START,
114 MPC52xx_PCI_MMIO_SIZE ));
116 out_be32(&pci_regs->iw2btar, MPC52xx_PCI_IWBTAR_TRANSLATION(
118 MPC52xx_PCI_IO_START,
119 MPC52xx_PCI_IO_SIZE ));
121 out_be32(&pci_regs->iwcr, MPC52xx_PCI_IWCR_PACK(
122 ( MPC52xx_PCI_IWCR_ENABLE | /* iw0btar */
123 MPC52xx_PCI_IWCR_READ_MULTI |
124 MPC52xx_PCI_IWCR_MEM ),
125 ( MPC52xx_PCI_IWCR_ENABLE | /* iw1btar */
126 MPC52xx_PCI_IWCR_READ |
127 MPC52xx_PCI_IWCR_MEM ),
128 ( MPC52xx_PCI_IWCR_ENABLE | /* iw2btar */
129 MPC52xx_PCI_IWCR_IO )
133 out_be32(&pci_regs->tbatr0,
134 MPC52xx_PCI_TBATR_ENABLE | MPC52xx_PCI_TARGET_IO );
135 out_be32(&pci_regs->tbatr1,
136 MPC52xx_PCI_TBATR_ENABLE | MPC52xx_PCI_TARGET_MEM );
138 out_be32(&pci_regs->tcr, MPC52xx_PCI_TCR_LD);
140 /* Reset the exteral bus ( internal PCI controller is NOT resetted ) */
141 /* Not necessary and can be a bad thing if for example the bootloader
142 is displaying a splash screen or ... Just left here for
143 documentation purpose if anyone need it */
146 tmp = in_be32(&pci_regs->gscr);
147 out_be32(&pci_regs->gscr, tmp | MPC52xx_PCI_GSCR_PR);
149 out_be32(&pci_regs->gscr, tmp);
154 mpc52xx_pci_fixup_resources(struct pci_dev *dev)
158 /* We don't rely on boot loader for PCI and resets all
160 for (i = 0; i < DEVICE_COUNT_RESOURCE; i++) {
161 struct resource *res = &dev->resource[i];
162 if (res->end > res->start) { /* Only valid resources */
163 res->end -= res->start;
165 res->flags |= IORESOURCE_UNSET;
169 /* The PCI Host bridge of MPC52xx has a prefetch memory resource
170 fixed to 1Gb. Doesn't fit in the resource system so we remove it */
171 if ( (dev->vendor == PCI_VENDOR_ID_MOTOROLA) &&
172 (dev->device == PCI_DEVICE_ID_MOTOROLA_MPC5200) ) {
173 struct resource *res = &dev->resource[1];
174 res->start = res->end = res->flags = 0;
179 mpc52xx_find_bridges(void)
181 struct mpc52xx_pci __iomem *pci_regs;
182 struct pci_controller *hose;
184 pci_assign_all_busses = 1;
186 pci_regs = ioremap(MPC52xx_PA(MPC52xx_PCI_OFFSET), MPC52xx_PCI_SIZE);
190 hose = pcibios_alloc_controller();
196 ppc_md.pci_swizzle = common_swizzle;
197 ppc_md.pcibios_fixup_resources = mpc52xx_pci_fixup_resources;
199 hose->first_busno = 0;
200 hose->last_busno = 0xff;
201 hose->bus_offset = 0;
202 hose->ops = &mpc52xx_pci_ops;
204 mpc52xx_pci_setup(pci_regs);
206 hose->pci_mem_offset = MPC52xx_PCI_MEM_OFFSET;
208 hose->io_base_virt = ioremap(MPC52xx_PCI_IO_BASE, MPC52xx_PCI_IO_SIZE);
209 isa_io_base = (unsigned long) hose->io_base_virt;
211 hose->cfg_addr = &pci_regs->car;
212 hose->cfg_data = hose->io_base_virt;
214 /* Setup resources */
215 pci_init_resource(&hose->mem_resources[0],
216 MPC52xx_PCI_MEM_START,
217 MPC52xx_PCI_MEM_STOP,
218 IORESOURCE_MEM|IORESOURCE_PREFETCH,
219 "PCI prefetchable memory");
221 pci_init_resource(&hose->mem_resources[1],
222 MPC52xx_PCI_MMIO_START,
223 MPC52xx_PCI_MMIO_STOP,
227 pci_init_resource(&hose->io_resource,
228 MPC52xx_PCI_IO_START,