2 * Low-Level PCI Support for the SH7780
4 * Dustin McIntire (dustin@sensoria.com)
5 * Derived from arch/i386/kernel/pci-*.c which bore the message:
6 * (c) 1999--2000 Martin Mares <mj@ucw.cz>
8 * Ported to the new API by Paul Mundt <lethal@linux-sh.org>
9 * With cleanup by Paul van Gool <pvangool@mimotech.com>
11 * May be copied or modified under the terms of the GNU General Public
12 * License. See linux/COPYING for more information.
17 #include <linux/types.h>
18 #include <linux/kernel.h>
19 #include <linux/init.h>
20 #include <linux/pci.h>
21 #include <linux/errno.h>
22 #include <linux/delay.h>
26 * Initialization. Try all known PCI access methods. Note that we support
27 * using both PCI BIOS and direct access: in such cases, we use I/O ports
28 * to access config space.
30 * Note that the platform specific initialization (BSC registers, and memory
31 * space mapping) will be called via the platform defined function
32 * pcibios_init_platform().
34 static int __init sh7780_pci_init(void)
39 pr_debug("PCI: Starting intialization.\n");
41 outl(0x00000001, SH7780_PCI_VCR2); /* Enable PCIC */
43 /* check for SH7780/SH7780R hardware */
44 id = pci_read_reg(SH7780_PCIVID);
45 if ((id != ((SH7780_DEVICE_ID << 16) | SH7780_VENDOR_ID)) &&
46 (id != ((SH7781_DEVICE_ID << 16) | SH7780_VENDOR_ID))) {
47 printk(KERN_ERR "PCI: This is not an SH7780 (%x)\n", id);
52 ctrl_outl(0x00200000, INTC_ICR0); /* INTC SH-4 Mode */
53 ctrl_outl(0x00078000, INTC_INT2MSKCR); /* enable PCIINTA - PCIINTD */
54 ctrl_outl(0x40000000, INTC_INTMSK1); /* disable IRL4-7 Interrupt */
55 ctrl_outl(0x0000fffe, INTC_INTMSK2); /* disable IRL4-7 Interrupt */
56 ctrl_outl(0x80000000, INTC_INTMSKCLR1); /* enable IRL0-3 Interrupt */
57 ctrl_outl(0xfffe0000, INTC_INTMSKCLR2); /* enable IRL0-3 Interrupt */
59 if ((ret = sh4_pci_check_direct()) != 0)
62 return pcibios_init_platform();
64 core_initcall(sh7780_pci_init);
66 int __init sh7780_pcic_init(struct sh4_pci_address_map *map)
71 * This code is unused for some boards as it is done in the
72 * bootloader and doing it here means the MAC addresses loaded
73 * by the bootloader get lost.
75 if (!(map->flags & SH4_PCIC_NO_RESET)) {
76 /* toggle PCI reset pin */
77 word = SH4_PCICR_PREFIX | SH4_PCICR_PRST;
78 pci_write_reg(word, SH4_PCICR);
79 /* Wait for a long time... not 1 sec. but long enough */
81 word = SH4_PCICR_PREFIX;
82 pci_write_reg(word, SH4_PCICR);
85 /* set the command/status bits to:
86 * Wait Cycle Control + Parity Enable + Bus Master +
89 pci_write_reg(0x00000046, SH7780_PCICMD);
91 /* define this host as the host bridge */
92 word = PCI_BASE_CLASS_BRIDGE << 24;
93 pci_write_reg(word, SH7780_PCIRID);
95 /* Set IO and Mem windows to local address
96 * Make PCI and local address the same for easy 1 to 1 mapping
97 * Window0 = map->window0.size @ non-cached area base = SDRAM
98 * Window1 = map->window1.size @ cached area base = SDRAM
100 word = ((map->window0.size - 1) & 0x1ff00001) | 0x01;
101 pci_write_reg(0x07f00001, SH4_PCILSR0);
102 word = ((map->window1.size - 1) & 0x1ff00001) | 0x01;
103 pci_write_reg(0x00000001, SH4_PCILSR1);
104 /* Set the values on window 0 PCI config registers */
105 word = P2SEGADDR(map->window0.base);
106 pci_write_reg(0xa8000000, SH4_PCILAR0);
107 pci_write_reg(0x08000000, SH7780_PCIMBAR0);
108 /* Set the values on window 1 PCI config registers */
109 word = P2SEGADDR(map->window1.base);
110 pci_write_reg(0x00000000, SH4_PCILAR1);
111 pci_write_reg(0x00000000, SH7780_PCIMBAR1);
113 /* Map IO space into PCI IO window
114 * The IO window is 64K-PCIBIOS_MIN_IO in size
115 * IO addresses will be translated to the
116 * PCI IO window base address
118 pr_debug("PCI: Mapping IO address 0x%x - 0x%x to base 0x%x\n",
119 PCIBIOS_MIN_IO, (64 << 10),
120 SH7780_PCI_IO_BASE + PCIBIOS_MIN_IO);
122 /* NOTE: I'm ignoring the PCI error IRQs for now..
123 * TODO: add support for the internal error interrupts and
127 #ifdef CONFIG_SH_R7780RP
131 /* SH7780 init done, set central function init complete */
132 /* use round robin mode to stop a device starving/overruning */
133 word = SH4_PCICR_PREFIX | SH4_PCICR_CFIN | SH4_PCICR_FTO;
134 pci_write_reg(word, SH4_PCICR);