diff options
Diffstat (limited to 'arch/arm/mach-iop32x/pci.c')
| -rw-r--r-- | arch/arm/mach-iop32x/pci.c | 401 |
1 files changed, 401 insertions, 0 deletions
diff --git a/arch/arm/mach-iop32x/pci.c b/arch/arm/mach-iop32x/pci.c new file mode 100644 index 000000000000..ab0010dc3145 --- /dev/null +++ b/arch/arm/mach-iop32x/pci.c @@ -0,0 +1,401 @@ +// 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); + |