// SPDX-License-Identifier: GPL-2.0-only /* * arch/arm/plat-iop/pci.c * * PCI support for the Intel IOP32X and IOP33X processors * * Author: Rory Bolt <rorybolt@pacbell.net> * Copyright (C) 2002 Rory Bolt */ #include <linux/kernel.h> #include <linux/pci.h> #include <linux/slab.h> #include <linux/mm.h> #include <linux/init.h> #include <linux/ioport.h> #include <linux/io.h> #include <asm/irq.h> #include <asm/signal.h> #include <asm/mach/pci.h> #include "hardware.h" #include "iop3xx.h" // #define DEBUG #ifdef DEBUG #define DBG(x...) printk(x) #else #define DBG(x...) do { } while (0) #endif /* * This routine builds either a type0 or type1 configuration command. If the * bus is on the 803xx then a type0 made, else a type1 is created. */ static u32 iop3xx_cfg_address(struct pci_bus *bus, int devfn, int where) { struct pci_sys_data *sys = bus->sysdata; u32 addr; if (sys->busnr == bus->number) addr = 1 << (PCI_SLOT(devfn) + 16) | (PCI_SLOT(devfn) << 11); else addr = bus->number << 16 | PCI_SLOT(devfn) << 11 | 1; addr |= PCI_FUNC(devfn) << 8 | (where & ~3); return addr; } /* * This routine checks the status of the last configuration cycle. If an error * was detected it returns a 1, else it returns a 0. The errors being checked * are parity, master abort, target abort (master and target). These types of * errors occur during a config cycle where there is no device, like during * the discovery stage. */ static int iop3xx_pci_status(void) { unsigned int status; int ret = 0; /* * Check the status registers. */ status = *IOP3XX_ATUSR; if (status & 0xf900) { DBG("\t\t\tPCI: P0 - status = 0x%08x\n", status); *IOP3XX_ATUSR = status & 0xf900; ret = 1; } status = *IOP3XX_ATUISR; if (status & 0x679f) { DBG("\t\t\tPCI: P1 - status = 0x%08x\n", status); *IOP3XX_ATUISR = status & 0x679f; ret = 1; } return ret; } /* * Simply write the address register and read the configuration * data. Note that the 4 nops ensure that we are able to handle * a delayed abort (in theory.) */ static u32 iop3xx_read(unsigned long addr) { u32 val; __asm__ __volatile__( "str %1, [%2]\n\t" "ldr %0, [%3]\n\t" "nop\n\t" "nop\n\t" "nop\n\t" "nop\n\t" : "=r" (val) : "r" (addr), "r" (IOP3XX_OCCAR), "r" (IOP3XX_OCCDR)); return val; } /* * The read routines must check the error status of the last configuration * cycle. If there was an error, the routine returns all hex f's. */ static int iop3xx_read_config(struct pci_bus *bus, unsigned int devfn, int where, int size, u32 *value) { unsigned long addr = iop3xx_cfg_address(bus, devfn, where); u32 val = iop3xx_read(addr) >> ((where & 3) * 8); if (iop3xx_pci_status()) val = 0xffffffff; *value = val; return PCIBIOS_SUCCESSFUL; } static int iop3xx_write_config(struct pci_bus *bus, unsigned int devfn, int where, int size, u32 value) { unsigned long addr = iop3xx_cfg_address(bus, devfn, where); u32 val; if (size != 4) { val = iop3xx_read(addr); if (iop3xx_pci_status()) return PCIBIOS_SUCCESSFUL; where = (where & 3) * 8; if (size == 1) val &= ~(0xff << where); else val &= ~(0xffff << where); *IOP3XX_OCCDR = val | value << where; } else { asm volatile( "str %1, [%2]\n\t" "str %0, [%3]\n\t" "nop\n\t" "nop\n\t" "nop\n\t" "nop\n\t" : : "r" (value), "r" (addr), "r" (IOP3XX_OCCAR), "r" (IOP3XX_OCCDR)); } return PCIBIOS_SUCCESSFUL; } struct pci_ops iop3xx_ops = { .read = iop3xx_read_config, .write = iop3xx_write_config, }; /* * When a PCI device does not exist during config cycles, the 80200 gets a * bus error instead of returning 0xffffffff. This handler simply returns. */ static int iop3xx_pci_abort(unsigned long addr, unsigned int fsr, struct pt_regs *regs) { DBG("PCI abort: address = 0x%08lx fsr = 0x%03x PC = 0x%08lx LR = 0x%08lx\n", addr, fsr, regs->ARM_pc, regs->ARM_lr); /* * If it was an imprecise abort, then we need to correct the * return address to be _after_ the instruction. */ if (fsr & (1 << 10)) regs->ARM_pc += 4; return 0; } int iop3xx_pci_setup(int nr, struct pci_sys_data *sys) { struct resource *res; if (nr != 0) return 0; res = kzalloc(sizeof(struct resource), GFP_KERNEL); if (!res) panic("PCI: unable to alloc resources"); res->start = IOP3XX_PCI_LOWER_MEM_PA; res->end = IOP3XX_PCI_LOWER_MEM_PA + IOP3XX_PCI_MEM_WINDOW_SIZE - 1; res->name = "IOP3XX PCI Memory Space"; res->flags = IORESOURCE_MEM; request_resource(&iomem_resource, res); /* * Use whatever translation is already setup. */ sys->mem_offset = IOP3XX_PCI_LOWER_MEM_PA - *IOP3XX_OMWTVR0; pci_add_resource_offset(&sys->resources, res, sys->mem_offset); pci_ioremap_io(0, IOP3XX_PCI_LOWER_IO_PA); return 1; } void __init iop3xx_atu_setup(void) { /* BAR 0 ( Disabled ) */ *IOP3XX_IAUBAR0 = 0x0; *IOP3XX_IABAR0 = 0x0; *IOP3XX_IATVR0 = 0x0; *IOP3XX_IALR0 = 0x0; /* BAR 1 ( Disabled ) */ *IOP3XX_IAUBAR1 = 0x0; *IOP3XX_IABAR1 = 0x0; *IOP3XX_IALR1 = 0x0; /* BAR 2 (1:1 mapping with Physical RAM) */ /* Set limit and enable */ *IOP3XX_IALR2 = ~((u32)IOP3XX_MAX_RAM_SIZE - 1) & ~0x1; *IOP3XX_IAUBAR2 = 0x0; /* Align the inbound bar with the base of memory */ *IOP3XX_IABAR2 = PHYS_OFFSET | PCI_BASE_ADDRESS_MEM_TYPE_64 | PCI_BASE_ADDRESS_MEM_PREFETCH; *IOP3XX_IATVR2 = PHYS_OFFSET; /* Outbound window 0 */ *IOP3XX_OMWTVR0 = IOP3XX_PCI_LOWER_MEM_BA; *IOP3XX_OUMWTVR0 = 0; /* Outbound window 1 */ *IOP3XX_OMWTVR1 = IOP3XX_PCI_LOWER_MEM_BA + IOP3XX_PCI_MEM_WINDOW_SIZE / 2; *IOP3XX_OUMWTVR1 = 0; /* BAR 3 ( Disabled ) */ *IOP3XX_IAUBAR3 = 0x0; *IOP3XX_IABAR3 = 0x0; *IOP3XX_IATVR3 = 0x0; *IOP3XX_IALR3 = 0x0; /* Setup the I/O Bar */ *IOP3XX_OIOWTVR = IOP3XX_PCI_LOWER_IO_BA; /* Enable inbound and outbound cycles */ *IOP3XX_ATUCMD |= PCI_COMMAND_MEMORY | PCI_COMMAND_MASTER | PCI_COMMAND_PARITY | PCI_COMMAND_SERR; *IOP3XX_ATUCR |= IOP3XX_ATUCR_OUT_EN; } void __init iop3xx_atu_disable(void) { *IOP3XX_ATUCMD = 0; *IOP3XX_ATUCR = 0; /* wait for cycles to quiesce */ while (*IOP3XX_PCSR & (IOP3XX_PCSR_OUT_Q_BUSY | IOP3XX_PCSR_IN_Q_BUSY)) cpu_relax(); /* BAR 0 ( Disabled ) */ *IOP3XX_IAUBAR0 = 0x0; *IOP3XX_IABAR0 = 0x0; *IOP3XX_IATVR0 = 0x0; *IOP3XX_IALR0 = 0x0; /* BAR 1 ( Disabled ) */ *IOP3XX_IAUBAR1 = 0x0; *IOP3XX_IABAR1 = 0x0; *IOP3XX_IALR1 = 0x0; /* BAR 2 ( Disabled ) */ *IOP3XX_IAUBAR2 = 0x0; *IOP3XX_IABAR2 = 0x0; *IOP3XX_IATVR2 = 0x0; *IOP3XX_IALR2 = 0x0; /* BAR 3 ( Disabled ) */ *IOP3XX_IAUBAR3 = 0x0; *IOP3XX_IABAR3 = 0x0; *IOP3XX_IATVR3 = 0x0; *IOP3XX_IALR3 = 0x0; /* Clear the outbound windows */ *IOP3XX_OIOWTVR = 0; /* Outbound window 0 */ *IOP3XX_OMWTVR0 = 0; *IOP3XX_OUMWTVR0 = 0; /* Outbound window 1 */ *IOP3XX_OMWTVR1 = 0; *IOP3XX_OUMWTVR1 = 0; } /* Flag to determine whether the ATU is initialized and the PCI bus scanned */ int init_atu; int iop3xx_get_init_atu(void) { /* check if default has been overridden */ if (init_atu != IOP3XX_INIT_ATU_DEFAULT) return init_atu; else return IOP3XX_INIT_ATU_DISABLE; } static void __init iop3xx_atu_debug(void) { DBG("PCI: Intel IOP3xx PCI init.\n"); DBG("PCI: Outbound memory window 0: PCI 0x%08x%08x\n", *IOP3XX_OUMWTVR0, *IOP3XX_OMWTVR0); DBG("PCI: Outbound memory window 1: PCI 0x%08x%08x\n", *IOP3XX_OUMWTVR1, *IOP3XX_OMWTVR1); DBG("PCI: Outbound IO window: PCI 0x%08x\n", *IOP3XX_OIOWTVR); DBG("PCI: Inbound memory window 0: PCI 0x%08x%08x 0x%08x -> 0x%08x\n", *IOP3XX_IAUBAR0, *IOP3XX_IABAR0, *IOP3XX_IALR0, *IOP3XX_IATVR0); DBG("PCI: Inbound memory window 1: PCI 0x%08x%08x 0x%08x\n", *IOP3XX_IAUBAR1, *IOP3XX_IABAR1, *IOP3XX_IALR1); DBG("PCI: Inbound memory window 2: PCI 0x%08x%08x 0x%08x -> 0x%08x\n", *IOP3XX_IAUBAR2, *IOP3XX_IABAR2, *IOP3XX_IALR2, *IOP3XX_IATVR2); DBG("PCI: Inbound memory window 3: PCI 0x%08x%08x 0x%08x -> 0x%08x\n", *IOP3XX_IAUBAR3, *IOP3XX_IABAR3, *IOP3XX_IALR3, *IOP3XX_IATVR3); DBG("PCI: Expansion ROM window: PCI 0x%08x%08x 0x%08x -> 0x%08x\n", 0, *IOP3XX_ERBAR, *IOP3XX_ERLR, *IOP3XX_ERTVR); DBG("ATU: IOP3XX_ATUCMD=0x%04x\n", *IOP3XX_ATUCMD); DBG("ATU: IOP3XX_ATUCR=0x%08x\n", *IOP3XX_ATUCR); hook_fault_code(16+6, iop3xx_pci_abort, SIGBUS, 0, "imprecise external abort"); } /* for platforms that might be host-bus-adapters */ void __init iop3xx_pci_preinit_cond(void) { if (iop3xx_get_init_atu() == IOP3XX_INIT_ATU_ENABLE) { iop3xx_atu_disable(); iop3xx_atu_setup(); iop3xx_atu_debug(); } } void __init iop3xx_pci_preinit(void) { pcibios_min_mem = 0; iop3xx_atu_disable(); iop3xx_atu_setup(); iop3xx_atu_debug(); } /* allow init_atu to be user overridden */ static int __init iop3xx_init_atu_setup(char *str) { init_atu = IOP3XX_INIT_ATU_DEFAULT; if (str) { while (*str != '\0') { switch (*str) { case 'y': case 'Y': init_atu = IOP3XX_INIT_ATU_ENABLE; break; case 'n': case 'N': init_atu = IOP3XX_INIT_ATU_DISABLE; break; case ',': case '=': break; default: printk(KERN_DEBUG "\"%s\" malformed at " "character: \'%c\'", __func__, *str); *(str + 1) = '\0'; } str++; } } return 1; } __setup("iop3xx_init_atu", iop3xx_init_atu_setup);