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 ctrl_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 SH7763_DEVICE_ID: 62 case SH7780_DEVICE_ID: 63 case SH7781_DEVICE_ID: 64 case SH7785_DEVICE_ID: 65 match = 1; 66 break; 67 } 68 } 69 70 if (unlikely(!match)) { 71 printk(KERN_ERR "PCI: This is not an SH7780 (%x)\n", id); 72 return -ENODEV; 73 } 74 75 /* Setup the INTC */ 76 if (mach_is_7780se()) { 77 /* ICR0: IRL=use separately */ 78 ctrl_outl(0x00C00020, INTC_ICR0); 79 /* ICR1: detect low level(for 2ndcut) */ 80 ctrl_outl(0xAAAA0000, INTC_ICR1); 81 /* INTPRI: priority=3(all) */ 82 ctrl_outl(0x33333333, INTC_INTPRI); 83 } 84 85 if ((ret = sh4_pci_check_direct()) != 0) 86 return ret; 87 88 return pcibios_init_platform(); 89 } 90 core_initcall(sh7780_pci_init); 91 92 int __init sh7780_pcic_init(struct sh4_pci_address_map *map) 93 { 94 u32 word; 95 96 /* 97 * This code is unused for some boards as it is done in the 98 * bootloader and doing it here means the MAC addresses loaded 99 * by the bootloader get lost. 100 */ 101 if (!(map->flags & SH4_PCIC_NO_RESET)) { 102 /* toggle PCI reset pin */ 103 word = SH4_PCICR_PREFIX | SH4_PCICR_PRST; 104 pci_write_reg(word, SH4_PCICR); 105 /* Wait for a long time... not 1 sec. but long enough */ 106 mdelay(100); 107 word = SH4_PCICR_PREFIX; 108 pci_write_reg(word, SH4_PCICR); 109 } 110 111 /* set the command/status bits to: 112 * Wait Cycle Control + Parity Enable + Bus Master + 113 * Mem space enable 114 */ 115 pci_write_reg(0x00000046, SH7780_PCICMD); 116 117 /* define this host as the host bridge */ 118 word = PCI_BASE_CLASS_BRIDGE << 24; 119 pci_write_reg(word, SH7780_PCIRID); 120 121 /* Set IO and Mem windows to local address 122 * Make PCI and local address the same for easy 1 to 1 mapping 123 * Window0 = map->window0.size @ non-cached area base = SDRAM 124 * Window1 = map->window1.size @ cached area base = SDRAM 125 */ 126 word = ((map->window0.size - 1) & 0x1ff00001) | 0x01; 127 pci_write_reg(0x07f00001, SH4_PCILSR0); 128 word = ((map->window1.size - 1) & 0x1ff00001) | 0x01; 129 pci_write_reg(0x00000001, SH4_PCILSR1); 130 /* Set the values on window 0 PCI config registers */ 131 word = P2SEGADDR(map->window0.base); 132 pci_write_reg(0xa8000000, SH4_PCILAR0); 133 pci_write_reg(0x08000000, SH7780_PCIMBAR0); 134 /* Set the values on window 1 PCI config registers */ 135 word = P2SEGADDR(map->window1.base); 136 pci_write_reg(0x00000000, SH4_PCILAR1); 137 pci_write_reg(0x00000000, SH7780_PCIMBAR1); 138 139 /* Map IO space into PCI IO window 140 * The IO window is 64K-PCIBIOS_MIN_IO in size 141 * IO addresses will be translated to the 142 * PCI IO window base address 143 */ 144 pr_debug("PCI: Mapping IO address 0x%x - 0x%x to base 0x%x\n", 145 PCIBIOS_MIN_IO, (64 << 10), 146 SH7780_PCI_IO_BASE + PCIBIOS_MIN_IO); 147 148 /* NOTE: I'm ignoring the PCI error IRQs for now.. 149 * TODO: add support for the internal error interrupts and 150 * DMA interrupts... 151 */ 152 153 /* Apply any last-minute PCIC fixups */ 154 pci_fixup_pcic(); 155 156 /* SH7780 init done, set central function init complete */ 157 /* use round robin mode to stop a device starving/overruning */ 158 word = SH4_PCICR_PREFIX | SH4_PCICR_CFIN | SH4_PCICR_FTO; 159 pci_write_reg(word, SH4_PCICR); 160 161 return 1; 162 } 163