1 /* 2 * Low-Level PCI Support for the SH7780 3 * 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> 7 * 8 * Ported to the new API by Paul Mundt <lethal@linux-sh.org> 9 * With cleanup by Paul van Gool <pvangool@mimotech.com> 10 * 11 * May be copied or modified under the terms of the GNU General Public 12 * License. See linux/COPYING for more information. 13 * 14 */ 15 #undef DEBUG 16 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> 23 #include "pci-sh4.h" 24 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) 38 39 /* 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. 43 * 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(). 47 */ 48 static int __init sh7780_pci_init(void) 49 { 50 unsigned int id; 51 int ret, match = 0; 52 53 pr_debug("PCI: Starting intialization.\n"); 54 55 outl(0x00000001, SH7780_PCI_VCR2); /* Enable PCIC */ 56 57 /* check for SH7780/SH7780R hardware */ 58 id = pci_read_reg(SH7780_PCIVID); 59 if ((id & 0xffff) == SH7780_VENDOR_ID) { 60 switch ((id >> 16) & 0xffff) { 61 case SH7780_DEVICE_ID: 62 case SH7781_DEVICE_ID: 63 case SH7785_DEVICE_ID: 64 match = 1; 65 break; 66 } 67 } 68 69 if (unlikely(!match)) { 70 printk(KERN_ERR "PCI: This is not an SH7780 (%x)\n", id); 71 return -ENODEV; 72 } 73 74 /* Setup the INTC */ 75 if (mach_is_7780se()) { 76 /* ICR0: IRL=use separately */ 77 ctrl_outl(0x00C00020, INTC_ICR0); 78 /* ICR1: detect low level(for 2ndcut) */ 79 ctrl_outl(0xAAAA0000, INTC_ICR1); 80 /* INTPRI: priority=3(all) */ 81 ctrl_outl(0x33333333, INTC_INTPRI); 82 } else { 83 /* INTC SH-4 Mode */ 84 ctrl_outl(0x00200000, INTC_ICR0); 85 /* enable PCIINTA - PCIINTD */ 86 ctrl_outl(0x00078000, INTC_INT2MSKCR); 87 /* disable IRL4-7 Interrupt */ 88 ctrl_outl(0x40000000, INTC_INTMSK1); 89 /* disable IRL4-7 Interrupt */ 90 ctrl_outl(0x0000fffe, INTC_INTMSK2); 91 /* enable IRL0-3 Interrupt */ 92 ctrl_outl(0x80000000, INTC_INTMSKCLR1); 93 /* enable IRL0-3 Interrupt */ 94 ctrl_outl(0xfffe0000, INTC_INTMSKCLR2); 95 } 96 97 if ((ret = sh4_pci_check_direct()) != 0) 98 return ret; 99 100 return pcibios_init_platform(); 101 } 102 core_initcall(sh7780_pci_init); 103 104 int __init sh7780_pcic_init(struct sh4_pci_address_map *map) 105 { 106 u32 word; 107 108 /* 109 * This code is unused for some boards as it is done in the 110 * bootloader and doing it here means the MAC addresses loaded 111 * by the bootloader get lost. 112 */ 113 if (!(map->flags & SH4_PCIC_NO_RESET)) { 114 /* toggle PCI reset pin */ 115 word = SH4_PCICR_PREFIX | SH4_PCICR_PRST; 116 pci_write_reg(word, SH4_PCICR); 117 /* Wait for a long time... not 1 sec. but long enough */ 118 mdelay(100); 119 word = SH4_PCICR_PREFIX; 120 pci_write_reg(word, SH4_PCICR); 121 } 122 123 /* set the command/status bits to: 124 * Wait Cycle Control + Parity Enable + Bus Master + 125 * Mem space enable 126 */ 127 pci_write_reg(0x00000046, SH7780_PCICMD); 128 129 /* define this host as the host bridge */ 130 word = PCI_BASE_CLASS_BRIDGE << 24; 131 pci_write_reg(word, SH7780_PCIRID); 132 133 /* Set IO and Mem windows to local address 134 * Make PCI and local address the same for easy 1 to 1 mapping 135 * Window0 = map->window0.size @ non-cached area base = SDRAM 136 * Window1 = map->window1.size @ cached area base = SDRAM 137 */ 138 word = ((map->window0.size - 1) & 0x1ff00001) | 0x01; 139 pci_write_reg(0x07f00001, SH4_PCILSR0); 140 word = ((map->window1.size - 1) & 0x1ff00001) | 0x01; 141 pci_write_reg(0x00000001, SH4_PCILSR1); 142 /* Set the values on window 0 PCI config registers */ 143 word = P2SEGADDR(map->window0.base); 144 pci_write_reg(0xa8000000, SH4_PCILAR0); 145 pci_write_reg(0x08000000, SH7780_PCIMBAR0); 146 /* Set the values on window 1 PCI config registers */ 147 word = P2SEGADDR(map->window1.base); 148 pci_write_reg(0x00000000, SH4_PCILAR1); 149 pci_write_reg(0x00000000, SH7780_PCIMBAR1); 150 151 /* Map IO space into PCI IO window 152 * The IO window is 64K-PCIBIOS_MIN_IO in size 153 * IO addresses will be translated to the 154 * PCI IO window base address 155 */ 156 pr_debug("PCI: Mapping IO address 0x%x - 0x%x to base 0x%x\n", 157 PCIBIOS_MIN_IO, (64 << 10), 158 SH7780_PCI_IO_BASE + PCIBIOS_MIN_IO); 159 160 /* NOTE: I'm ignoring the PCI error IRQs for now.. 161 * TODO: add support for the internal error interrupts and 162 * DMA interrupts... 163 */ 164 165 /* Apply any last-minute PCIC fixups */ 166 pci_fixup_pcic(); 167 168 /* SH7780 init done, set central function init complete */ 169 /* use round robin mode to stop a device starving/overruning */ 170 word = SH4_PCICR_PREFIX | SH4_PCICR_CFIN | SH4_PCICR_FTO; 171 pci_write_reg(word, SH4_PCICR); 172 173 return 1; 174 } 175