pci_gt64120.c
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/*
* Copyright (C) 2013 Gabor Juhos <juhosg@openwrt.org>
*
* Based on the Linux implementation.
* Copyright (C) 1999, 2000, 2004 MIPS Technologies, Inc.
* Authors: Carsten Langgaard <carstenl@mips.com>
* Maciej W. Rozycki <macro@mips.com>
*
* SPDX-License-Identifier: GPL-2.0
*/
#include <common.h>
#include <gt64120.h>
#include <pci.h>
#include <pci_gt64120.h>
#include <asm/io.h>
#define PCI_ACCESS_READ 0
#define PCI_ACCESS_WRITE 1
struct gt64120_regs {
u8 unused_000[0xc18];
u32 intrcause;
u8 unused_c1c[0x0dc];
u32 pci0_cfgaddr;
u32 pci0_cfgdata;
};
struct gt64120_pci_controller {
struct pci_controller hose;
struct gt64120_regs *regs;
};
static inline struct gt64120_pci_controller *
hose_to_gt64120(struct pci_controller *hose)
{
return container_of(hose, struct gt64120_pci_controller, hose);
}
#define GT_INTRCAUSE_ABORT_BITS \
(GT_INTRCAUSE_MASABORT0_BIT | GT_INTRCAUSE_TARABORT0_BIT)
static int gt_config_access(struct gt64120_pci_controller *gt,
unsigned char access_type, pci_dev_t bdf,
int where, u32 *data)
{
unsigned int bus = PCI_BUS(bdf);
unsigned int dev = PCI_DEV(bdf);
unsigned int devfn = PCI_DEV(bdf) << 3 | PCI_FUNC(bdf);
u32 intr;
u32 addr;
u32 val;
if (bus == 0 && dev >= 31) {
/* Because of a bug in the galileo (for slot 31). */
return -1;
}
if (access_type == PCI_ACCESS_WRITE)
debug("PCI WR %02x:%02x.%x reg:%02d data:%08x\n",
PCI_BUS(bdf), PCI_DEV(bdf), PCI_FUNC(bdf), where, *data);
/* Clear cause register bits */
writel(~GT_INTRCAUSE_ABORT_BITS, >->regs->intrcause);
addr = GT_PCI0_CFGADDR_CONFIGEN_BIT;
addr |= bus << GT_PCI0_CFGADDR_BUSNUM_SHF;
addr |= devfn << GT_PCI0_CFGADDR_FUNCTNUM_SHF;
addr |= (where / 4) << GT_PCI0_CFGADDR_REGNUM_SHF;
/* Setup address */
writel(addr, >->regs->pci0_cfgaddr);
if (access_type == PCI_ACCESS_WRITE) {
if (bus == 0 && dev == 0) {
/*
* The Galileo system controller is acting
* differently than other devices.
*/
val = *data;
} else {
val = cpu_to_le32(*data);
}
writel(val, >->regs->pci0_cfgdata);
} else {
val = readl(>->regs->pci0_cfgdata);
if (bus == 0 && dev == 0) {
/*
* The Galileo system controller is acting
* differently than other devices.
*/
*data = val;
} else {
*data = le32_to_cpu(val);
}
}
/* Check for master or target abort */
intr = readl(>->regs->intrcause);
if (intr & GT_INTRCAUSE_ABORT_BITS) {
/* Error occurred, clear abort bits */
writel(~GT_INTRCAUSE_ABORT_BITS, >->regs->intrcause);
return -1;
}
if (access_type == PCI_ACCESS_READ)
debug("PCI RD %02x:%02x.%x reg:%02d data:%08x\n",
PCI_BUS(bdf), PCI_DEV(bdf), PCI_FUNC(bdf), where, *data);
return 0;
}
static int gt_read_config_dword(struct pci_controller *hose, pci_dev_t dev,
int where, u32 *value)
{
struct gt64120_pci_controller *gt = hose_to_gt64120(hose);
*value = 0xffffffff;
return gt_config_access(gt, PCI_ACCESS_READ, dev, where, value);
}
static int gt_write_config_dword(struct pci_controller *hose, pci_dev_t dev,
int where, u32 value)
{
struct gt64120_pci_controller *gt = hose_to_gt64120(hose);
u32 data = value;
return gt_config_access(gt, PCI_ACCESS_WRITE, dev, where, &data);
}
void gt64120_pci_init(void *regs, unsigned long sys_bus, unsigned long sys_phys,
unsigned long sys_size, unsigned long mem_bus,
unsigned long mem_phys, unsigned long mem_size,
unsigned long io_bus, unsigned long io_phys,
unsigned long io_size)
{
static struct gt64120_pci_controller global_gt;
struct gt64120_pci_controller *gt;
struct pci_controller *hose;
gt = &global_gt;
gt->regs = regs;
hose = >->hose;
hose->first_busno = 0;
hose->last_busno = 0;
/* System memory space */
pci_set_region(&hose->regions[0], sys_bus, sys_phys, sys_size,
PCI_REGION_MEM | PCI_REGION_SYS_MEMORY);
/* PCI memory space */
pci_set_region(&hose->regions[1], mem_bus, mem_phys, mem_size,
PCI_REGION_MEM);
/* PCI I/O space */
pci_set_region(&hose->regions[2], io_bus, io_phys, io_size,
PCI_REGION_IO);
hose->region_count = 3;
pci_set_ops(hose,
pci_hose_read_config_byte_via_dword,
pci_hose_read_config_word_via_dword,
gt_read_config_dword,
pci_hose_write_config_byte_via_dword,
pci_hose_write_config_word_via_dword,
gt_write_config_dword);
pci_register_hose(hose);
hose->last_busno = pci_hose_scan(hose);
}