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>
32 #include <asm/debug.h>
35 static inline void clear_status(void)
37 unsigned long pci_stat;
39 pci_stat = inl(PCI_BASE | PCI_GPPM_STATUS);
40 outl(pci_stat, PCI_BASE | PCI_GPPM_ICLR);
43 static inline unsigned int
44 calc_cfg_addr(struct pci_bus *bus, unsigned int devfn, int where)
48 addr = ((bus->number > 0) ? (((bus->number & 0xff) << PCI_CFG_BUS_SHIFT) | 1) : 0);
49 addr |= ((devfn & 0xff) << PCI_CFG_FUNC_SHIFT) | (where & 0xfc);
55 config_access(unsigned int pci_cmd, struct pci_bus *bus, unsigned int devfn, int where, unsigned int pci_mode, unsigned int *val)
58 unsigned long loops = 0;
59 unsigned long ioaddr = calc_cfg_addr(bus, devfn, where);
61 local_irq_save(flags);
62 /*Clear pending interrupt status */
63 if (inl(PCI_BASE | PCI_GPPM_STATUS)) {
65 while (!(inl(PCI_BASE | PCI_GPPM_STATUS) == 0)) ;
68 outl(ioaddr, PCI_BASE | PCI_GPPM_ADDR);
70 if ((pci_cmd == PCI_CMD_IOW) || (pci_cmd == PCI_CMD_CONFIG_WRITE))
71 outl(*val, PCI_BASE | PCI_GPPM_WDAT);
73 outl(INIT_PCI_CYCLE | pci_cmd | (pci_mode & PCI_BYTE_ENABLE_MASK),
74 PCI_BASE | PCI_GPPM_CTRL);
78 PCI_IO_JIFFIES_TIMEOUT) >> (PCI_IO_JIFFIES_SHIFT));
80 if (inl(PCI_BASE | PCI_GPPM_STATUS) & GPPM_DONE) {
81 if ((pci_cmd == PCI_CMD_IOR) ||
82 (pci_cmd == PCI_CMD_CONFIG_READ))
83 *val = inl(PCI_BASE | PCI_GPPM_RDAT);
85 local_irq_restore(flags);
86 return PCIBIOS_SUCCESSFUL;
87 } else if (inl(PCI_BASE | PCI_GPPM_STATUS) & GPPM_R_MABORT) {
93 printk("%s : Arbiter Locked.\n", __func__);
98 if ((pci_cmd == PCI_CMD_IOR) || (pci_cmd == PCI_CMD_IOW)) {
99 printk("%s timeout (GPPM_CTRL=%X) ioaddr %lX pci_cmd %X\n",
100 __func__, inl(PCI_BASE | PCI_GPPM_CTRL), ioaddr,
104 if ((pci_cmd == PCI_CMD_IOR) || (pci_cmd == PCI_CMD_CONFIG_READ))
106 local_irq_restore(flags);
107 return PCIBIOS_DEVICE_NOT_FOUND;
111 * We can't address 8 and 16 bit words directly. Instead we have to
112 * read/write a 32bit word and mask/modify the data we actually want.
115 read_config_byte(struct pci_bus *bus, unsigned int devfn, int where, u8 * val)
117 unsigned int data = 0;
123 err = config_access(PCI_CMD_CONFIG_READ, bus, devfn, where, ~(1 << (where & 3)), &data);
124 switch (where & 0x03) {
126 *val = (unsigned char)(data & 0x000000ff);
129 *val = (unsigned char)((data & 0x0000ff00) >> 8);
132 *val = (unsigned char)((data & 0x00ff0000) >> 16);
135 *val = (unsigned char)((data & 0xff000000) >> 24);
143 read_config_word(struct pci_bus *bus, unsigned int devfn, int where, u16 * val)
145 unsigned int data = 0;
152 return PCIBIOS_BAD_REGISTER_NUMBER;
154 err = config_access(PCI_CMD_CONFIG_READ, bus, devfn, where, ~(3 << (where & 3)), &data);
155 switch (where & 0x02) {
157 *val = (unsigned short)(data & 0x0000ffff);
160 *val = (unsigned short)((data & 0xffff0000) >> 16);
168 read_config_dword(struct pci_bus *bus, unsigned int devfn, int where, u32 * val)
175 return PCIBIOS_BAD_REGISTER_NUMBER;
177 err = config_access(PCI_CMD_CONFIG_READ, bus, devfn, where, 0, val);
183 write_config_byte(struct pci_bus *bus, unsigned int devfn, int where, u8 val)
185 unsigned int data = (unsigned int)val;
191 switch (where & 0x03) {
205 err = config_access(PCI_CMD_CONFIG_WRITE, bus, devfn, where, ~(1 << (where & 3)), &data);
211 write_config_word(struct pci_bus *bus, unsigned int devfn, int where, u16 val)
213 unsigned int data = (unsigned int)val;
220 return PCIBIOS_BAD_REGISTER_NUMBER;
222 switch (where & 0x02) {
229 err = config_access(PCI_CMD_CONFIG_WRITE, bus, devfn, where, ~(3 << (where & 3)), &data);
235 write_config_dword(struct pci_bus *bus, unsigned int devfn, int where, u32 val)
242 return PCIBIOS_BAD_REGISTER_NUMBER;
244 err = config_access(PCI_CMD_CONFIG_WRITE, bus, devfn, where, 0, &val);
249 static int config_read(struct pci_bus *bus, unsigned int devfn, int where, int size, u32 * val)
254 int rc = read_config_byte(bus, devfn, where, &_val);
260 int rc = read_config_word(bus, devfn, where, &_val);
265 return read_config_dword(bus, devfn, where, val);
269 static int config_write(struct pci_bus *bus, unsigned int devfn, int where, int size, u32 val)
273 return write_config_byte(bus, devfn, where, (u8) val);
275 return write_config_word(bus, devfn, where, (u16) val);
277 return write_config_dword(bus, devfn, where, val);
281 struct pci_ops pnx8550_pci_ops = {