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>
25 #define INTC_BASE 0xffd00000
26 #define INTC_ICR0 (INTC_BASE+0x0)
27 #define INTC_ICR1 (INTC_BASE+0x1c)
28 #define INTC_INTPRI (INTC_BASE+0x10)
29 #define INTC_INTREQ (INTC_BASE+0x24)
30 #define INTC_INTMSK0 (INTC_BASE+0x44)
31 #define INTC_INTMSK1 (INTC_BASE+0x48)
32 #define INTC_INTMSK2 (INTC_BASE+0x40080)
33 #define INTC_INTMSKCLR0 (INTC_BASE+0x64)
34 #define INTC_INTMSKCLR1 (INTC_BASE+0x68)
35 #define INTC_INTMSKCLR2 (INTC_BASE+0x40084)
36 #define INTC_INT2MSKR (INTC_BASE+0x40038)
37 #define INTC_INT2MSKCR (INTC_BASE+0x4003c)
40 * Initialization. Try all known PCI access methods. Note that we support
41 * using both PCI BIOS and direct access: in such cases, we use I/O ports
42 * to access config space.
44 * Note that the platform specific initialization (BSC registers, and memory
45 * space mapping) will be called via the platform defined function
46 * pcibios_init_platform().
48 static int __init sh7780_pci_init(void)
53 pr_debug("PCI: Starting intialization.\n");
55 outl(0x00000001, SH7780_PCI_VCR2); /* Enable PCIC */
57 /* check for SH7780/SH7780R hardware */
58 id = pci_read_reg(SH7780_PCIVID);
59 if ((id != ((SH7780_DEVICE_ID << 16) | SH7780_VENDOR_ID)) &&
60 (id != ((SH7781_DEVICE_ID << 16) | SH7780_VENDOR_ID))) {
61 printk(KERN_ERR "PCI: This is not an SH7780 (%x)\n", id);
66 ctrl_outl(0x00200000, INTC_ICR0); /* INTC SH-4 Mode */
67 ctrl_outl(0x00078000, INTC_INT2MSKCR); /* enable PCIINTA - PCIINTD */
68 ctrl_outl(0x40000000, INTC_INTMSK1); /* disable IRL4-7 Interrupt */
69 ctrl_outl(0x0000fffe, INTC_INTMSK2); /* disable IRL4-7 Interrupt */
70 ctrl_outl(0x80000000, INTC_INTMSKCLR1); /* enable IRL0-3 Interrupt */
71 ctrl_outl(0xfffe0000, INTC_INTMSKCLR2); /* enable IRL0-3 Interrupt */
73 if ((ret = sh4_pci_check_direct()) != 0)
76 return pcibios_init_platform();
78 core_initcall(sh7780_pci_init);
80 int __init sh7780_pcic_init(struct sh4_pci_address_map *map)
85 * This code is unused for some boards as it is done in the
86 * bootloader and doing it here means the MAC addresses loaded
87 * by the bootloader get lost.
89 if (!(map->flags & SH4_PCIC_NO_RESET)) {
90 /* toggle PCI reset pin */
91 word = SH4_PCICR_PREFIX | SH4_PCICR_PRST;
92 pci_write_reg(word, SH4_PCICR);
93 /* Wait for a long time... not 1 sec. but long enough */
95 word = SH4_PCICR_PREFIX;
96 pci_write_reg(word, SH4_PCICR);
99 /* set the command/status bits to:
100 * Wait Cycle Control + Parity Enable + Bus Master +
103 pci_write_reg(0x00000046, SH7780_PCICMD);
105 /* define this host as the host bridge */
106 word = PCI_BASE_CLASS_BRIDGE << 24;
107 pci_write_reg(word, SH7780_PCIRID);
109 /* Set IO and Mem windows to local address
110 * Make PCI and local address the same for easy 1 to 1 mapping
111 * Window0 = map->window0.size @ non-cached area base = SDRAM
112 * Window1 = map->window1.size @ cached area base = SDRAM
114 word = ((map->window0.size - 1) & 0x1ff00001) | 0x01;
115 pci_write_reg(0x07f00001, SH4_PCILSR0);
116 word = ((map->window1.size - 1) & 0x1ff00001) | 0x01;
117 pci_write_reg(0x00000001, SH4_PCILSR1);
118 /* Set the values on window 0 PCI config registers */
119 word = P2SEGADDR(map->window0.base);
120 pci_write_reg(0xa8000000, SH4_PCILAR0);
121 pci_write_reg(0x08000000, SH7780_PCIMBAR0);
122 /* Set the values on window 1 PCI config registers */
123 word = P2SEGADDR(map->window1.base);
124 pci_write_reg(0x00000000, SH4_PCILAR1);
125 pci_write_reg(0x00000000, SH7780_PCIMBAR1);
127 /* Map IO space into PCI IO window
128 * The IO window is 64K-PCIBIOS_MIN_IO in size
129 * IO addresses will be translated to the
130 * PCI IO window base address
132 pr_debug("PCI: Mapping IO address 0x%x - 0x%x to base 0x%x\n",
133 PCIBIOS_MIN_IO, (64 << 10),
134 SH7780_PCI_IO_BASE + PCIBIOS_MIN_IO);
136 /* NOTE: I'm ignoring the PCI error IRQs for now..
137 * TODO: add support for the internal error interrupts and
141 #ifdef CONFIG_SH_R7780RP
145 /* SH7780 init done, set central function init complete */
146 /* use round robin mode to stop a device starving/overruning */
147 word = SH4_PCICR_PREFIX | SH4_PCICR_CFIN | SH4_PCICR_FTO;
148 pci_write_reg(word, SH4_PCICR);