3 * BRIEF MODULE DESCRIPTION
5 * 2.6 port, Embedded Alley Solutions, Inc
8 * Author: source@mvista.com
10 * This program is free software; you can distribute it and/or modify it
11 * under the terms of the GNU General Public License (Version 2) as
12 * published by the Free Software Foundation.
14 * This program is distributed in the hope it will be useful, but WITHOUT
15 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
16 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
19 * You should have received a copy of the GNU General Public License along
20 * with this program; if not, write to the Free Software Foundation, Inc.,
21 * 59 Temple Place - Suite 330, Boston MA 02111-1307, USA.
23 #include <linux/types.h>
24 #include <linux/pci.h>
25 #include <linux/kernel.h>
26 #include <linux/init.h>
27 #include <linux/vmalloc.h>
28 #include <linux/delay.h>
30 #include <asm/mach-pnx8550/pci.h>
31 #include <asm/mach-pnx8550/glb.h>
33 static inline void clear_status(void)
35 unsigned long pci_stat;
37 pci_stat = inl(PCI_BASE | PCI_GPPM_STATUS);
38 outl(pci_stat, PCI_BASE | PCI_GPPM_ICLR);
41 static inline unsigned int
42 calc_cfg_addr(struct pci_bus *bus, unsigned int devfn, int where)
46 addr = ((bus->number > 0) ? (((bus->number & 0xff) << PCI_CFG_BUS_SHIFT) | 1) : 0);
47 addr |= ((devfn & 0xff) << PCI_CFG_FUNC_SHIFT) | (where & 0xfc);
53 config_access(unsigned int pci_cmd, struct pci_bus *bus, unsigned int devfn, int where, unsigned int pci_mode, unsigned int *val)
56 unsigned long loops = 0;
57 unsigned long ioaddr = calc_cfg_addr(bus, devfn, where);
59 local_irq_save(flags);
60 /*Clear pending interrupt status */
61 if (inl(PCI_BASE | PCI_GPPM_STATUS)) {
63 while (!(inl(PCI_BASE | PCI_GPPM_STATUS) == 0)) ;
66 outl(ioaddr, PCI_BASE | PCI_GPPM_ADDR);
68 if ((pci_cmd == PCI_CMD_IOW) || (pci_cmd == PCI_CMD_CONFIG_WRITE))
69 outl(*val, PCI_BASE | PCI_GPPM_WDAT);
71 outl(INIT_PCI_CYCLE | pci_cmd | (pci_mode & PCI_BYTE_ENABLE_MASK),
72 PCI_BASE | PCI_GPPM_CTRL);
76 PCI_IO_JIFFIES_TIMEOUT) >> (PCI_IO_JIFFIES_SHIFT));
78 if (inl(PCI_BASE | PCI_GPPM_STATUS) & GPPM_DONE) {
79 if ((pci_cmd == PCI_CMD_IOR) ||
80 (pci_cmd == PCI_CMD_CONFIG_READ))
81 *val = inl(PCI_BASE | PCI_GPPM_RDAT);
83 local_irq_restore(flags);
84 return PCIBIOS_SUCCESSFUL;
85 } else if (inl(PCI_BASE | PCI_GPPM_STATUS) & GPPM_R_MABORT) {
91 printk("%s : Arbiter Locked.\n", __func__);
96 if ((pci_cmd == PCI_CMD_IOR) || (pci_cmd == PCI_CMD_IOW)) {
97 printk("%s timeout (GPPM_CTRL=%X) ioaddr %lX pci_cmd %X\n",
98 __func__, inl(PCI_BASE | PCI_GPPM_CTRL), ioaddr,
102 if ((pci_cmd == PCI_CMD_IOR) || (pci_cmd == PCI_CMD_CONFIG_READ))
104 local_irq_restore(flags);
105 return PCIBIOS_DEVICE_NOT_FOUND;
109 * We can't address 8 and 16 bit words directly. Instead we have to
110 * read/write a 32bit word and mask/modify the data we actually want.
113 read_config_byte(struct pci_bus *bus, unsigned int devfn, int where, u8 * val)
115 unsigned int data = 0;
121 err = config_access(PCI_CMD_CONFIG_READ, bus, devfn, where, ~(1 << (where & 3)), &data);
122 switch (where & 0x03) {
124 *val = (unsigned char)(data & 0x000000ff);
127 *val = (unsigned char)((data & 0x0000ff00) >> 8);
130 *val = (unsigned char)((data & 0x00ff0000) >> 16);
133 *val = (unsigned char)((data & 0xff000000) >> 24);
141 read_config_word(struct pci_bus *bus, unsigned int devfn, int where, u16 * val)
143 unsigned int data = 0;
150 return PCIBIOS_BAD_REGISTER_NUMBER;
152 err = config_access(PCI_CMD_CONFIG_READ, bus, devfn, where, ~(3 << (where & 3)), &data);
153 switch (where & 0x02) {
155 *val = (unsigned short)(data & 0x0000ffff);
158 *val = (unsigned short)((data & 0xffff0000) >> 16);
166 read_config_dword(struct pci_bus *bus, unsigned int devfn, int where, u32 * val)
173 return PCIBIOS_BAD_REGISTER_NUMBER;
175 err = config_access(PCI_CMD_CONFIG_READ, bus, devfn, where, 0, val);
181 write_config_byte(struct pci_bus *bus, unsigned int devfn, int where, u8 val)
183 unsigned int data = (unsigned int)val;
189 switch (where & 0x03) {
203 err = config_access(PCI_CMD_CONFIG_WRITE, bus, devfn, where, ~(1 << (where & 3)), &data);
209 write_config_word(struct pci_bus *bus, unsigned int devfn, int where, u16 val)
211 unsigned int data = (unsigned int)val;
218 return PCIBIOS_BAD_REGISTER_NUMBER;
220 switch (where & 0x02) {
227 err = config_access(PCI_CMD_CONFIG_WRITE, bus, devfn, where, ~(3 << (where & 3)), &data);
233 write_config_dword(struct pci_bus *bus, unsigned int devfn, int where, u32 val)
240 return PCIBIOS_BAD_REGISTER_NUMBER;
242 err = config_access(PCI_CMD_CONFIG_WRITE, bus, devfn, where, 0, &val);
247 static int config_read(struct pci_bus *bus, unsigned int devfn, int where, int size, u32 * val)
252 int rc = read_config_byte(bus, devfn, where, &_val);
258 int rc = read_config_word(bus, devfn, where, &_val);
263 return read_config_dword(bus, devfn, where, val);
267 static int config_write(struct pci_bus *bus, unsigned int devfn, int where, int size, u32 val)
271 return write_config_byte(bus, devfn, where, (u8) val);
273 return write_config_word(bus, devfn, where, (u16) val);
275 return write_config_dword(bus, devfn, where, val);
279 struct pci_ops pnx8550_pci_ops = {