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linux-stable/arch/powerpc/sysdev/tsi108_pci.c
Michael Ellerman 19fc65b525 powerpc: Fix irq_alloc_host() reference counting and callers 
When I changed irq_alloc_host() to take an of_node
(52964f87c6: "Add an optional
device_node pointer to the irq_host"), I botched the reference
counting semantics.

Stephen pointed out that it's irq_alloc_host()'s business if
it needs to take an additional reference to the device_node,
the caller shouldn't need to care.

Signed-off-by: Michael Ellerman <michael@ellerman.id.au>
Signed-off-by: Paul Mackerras <paulus@samba.org>
2008-06-09 13:51:16 +10:00

445 lines
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/*
* Common routines for Tundra Semiconductor TSI108 host bridge.
*
* 2004-2005 (c) Tundra Semiconductor Corp.
* Author: Alex Bounine (alexandreb@tundra.com)
* Author: Roy Zang (tie-fei.zang@freescale.com)
* Add pci interrupt router host
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the Free
* Software Foundation; either version 2 of the License, or (at your option)
* any later version.
*
* This program is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License along with
* this program; if not, write to the Free Software Foundation, Inc., 59
* Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/pci.h>
#include <linux/slab.h>
#include <linux/irq.h>
#include <linux/interrupt.h>
#include <asm/byteorder.h>
#include <asm/io.h>
#include <asm/irq.h>
#include <asm/uaccess.h>
#include <asm/machdep.h>
#include <asm/pci-bridge.h>
#include <asm/tsi108.h>
#include <asm/tsi108_pci.h>
#include <asm/tsi108_irq.h>
#include <asm/prom.h>
#undef DEBUG
#ifdef DEBUG
#define DBG(x...) printk(x)
#else
#define DBG(x...)
#endif
#define tsi_mk_config_addr(bus, devfunc, offset) \
((((bus)<<16) | ((devfunc)<<8) | (offset & 0xfc)) + tsi108_pci_cfg_base)
u32 tsi108_pci_cfg_base;
static u32 tsi108_pci_cfg_phys;
u32 tsi108_csr_vir_base;
static struct irq_host *pci_irq_host;
extern u32 get_vir_csrbase(void);
extern u32 tsi108_read_reg(u32 reg_offset);
extern void tsi108_write_reg(u32 reg_offset, u32 val);
int
tsi108_direct_write_config(struct pci_bus *bus, unsigned int devfunc,
int offset, int len, u32 val)
{
volatile unsigned char *cfg_addr;
struct pci_controller *hose = bus->sysdata;
if (ppc_md.pci_exclude_device)
if (ppc_md.pci_exclude_device(hose, bus->number, devfunc))
return PCIBIOS_DEVICE_NOT_FOUND;
cfg_addr = (unsigned char *)(tsi_mk_config_addr(bus->number,
devfunc, offset) |
(offset & 0x03));
#ifdef DEBUG
printk("PCI CFG write : ");
printk("%d:0x%x:0x%x ", bus->number, devfunc, offset);
printk("%d ADDR=0x%08x ", len, (uint) cfg_addr);
printk("data = 0x%08x\n", val);
#endif
switch (len) {
case 1:
out_8((u8 *) cfg_addr, val);
break;
case 2:
out_le16((u16 *) cfg_addr, val);
break;
default:
out_le32((u32 *) cfg_addr, val);
break;
}
return PCIBIOS_SUCCESSFUL;
}
void tsi108_clear_pci_error(u32 pci_cfg_base)
{
u32 err_stat, err_addr, pci_stat;
/*
* Quietly clear PB and PCI error flags set as result
* of PCI/X configuration read requests.
*/
/* Read PB Error Log Registers */
err_stat = tsi108_read_reg(TSI108_PB_OFFSET + TSI108_PB_ERRCS);
err_addr = tsi108_read_reg(TSI108_PB_OFFSET + TSI108_PB_AERR);
if (err_stat & TSI108_PB_ERRCS_ES) {
/* Clear error flag */
tsi108_write_reg(TSI108_PB_OFFSET + TSI108_PB_ERRCS,
TSI108_PB_ERRCS_ES);
/* Clear read error reported in PB_ISR */
tsi108_write_reg(TSI108_PB_OFFSET + TSI108_PB_ISR,
TSI108_PB_ISR_PBS_RD_ERR);
/* Clear PCI/X bus cfg errors if applicable */
if ((err_addr & 0xFF000000) == pci_cfg_base) {
pci_stat =
tsi108_read_reg(TSI108_PCI_OFFSET + TSI108_PCI_CSR);
tsi108_write_reg(TSI108_PCI_OFFSET + TSI108_PCI_CSR,
pci_stat);
}
}
return;
}
#define __tsi108_read_pci_config(x, addr, op) \
__asm__ __volatile__( \
" "op" %0,0,%1\n" \
"1: eieio\n" \
"2:\n" \
".section .fixup,\"ax\"\n" \
"3: li %0,-1\n" \
" b 2b\n" \
".section __ex_table,\"a\"\n" \
" .align 2\n" \
" .long 1b,3b\n" \
".text" \
: "=r"(x) : "r"(addr))
int
tsi108_direct_read_config(struct pci_bus *bus, unsigned int devfn, int offset,
int len, u32 * val)
{
volatile unsigned char *cfg_addr;
struct pci_controller *hose = bus->sysdata;
u32 temp;
if (ppc_md.pci_exclude_device)
if (ppc_md.pci_exclude_device(hose, bus->number, devfn))
return PCIBIOS_DEVICE_NOT_FOUND;
cfg_addr = (unsigned char *)(tsi_mk_config_addr(bus->number,
devfn,
offset) | (offset &
0x03));
switch (len) {
case 1:
__tsi108_read_pci_config(temp, cfg_addr, "lbzx");
break;
case 2:
__tsi108_read_pci_config(temp, cfg_addr, "lhbrx");
break;
default:
__tsi108_read_pci_config(temp, cfg_addr, "lwbrx");
break;
}
*val = temp;
#ifdef DEBUG
if ((0xFFFFFFFF != temp) && (0xFFFF != temp) && (0xFF != temp)) {
printk("PCI CFG read : ");
printk("%d:0x%x:0x%x ", bus->number, devfn, offset);
printk("%d ADDR=0x%08x ", len, (uint) cfg_addr);
printk("data = 0x%x\n", *val);
}
#endif
return PCIBIOS_SUCCESSFUL;
}
void tsi108_clear_pci_cfg_error(void)
{
tsi108_clear_pci_error(tsi108_pci_cfg_phys);
}
static struct pci_ops tsi108_direct_pci_ops = {
.read = tsi108_direct_read_config,
.write = tsi108_direct_write_config,
};
int __init tsi108_setup_pci(struct device_node *dev, u32 cfg_phys, int primary)
{
int len;
struct pci_controller *hose;
struct resource rsrc;
const int *bus_range;
int has_address = 0;
/* PCI Config mapping */
tsi108_pci_cfg_base = (u32)ioremap(cfg_phys, TSI108_PCI_CFG_SIZE);
tsi108_pci_cfg_phys = cfg_phys;
DBG("TSI_PCI: %s tsi108_pci_cfg_base=0x%x\n", __func__,
tsi108_pci_cfg_base);
/* Fetch host bridge registers address */
has_address = (of_address_to_resource(dev, 0, &rsrc) == 0);
/* Get bus range if any */
bus_range = of_get_property(dev, "bus-range", &len);
if (bus_range == NULL || len < 2 * sizeof(int)) {
printk(KERN_WARNING "Can't get bus-range for %s, assume"
" bus 0\n", dev->full_name);
}
hose = pcibios_alloc_controller(dev);
if (!hose) {
printk("PCI Host bridge init failed\n");
return -ENOMEM;
}
hose->first_busno = bus_range ? bus_range[0] : 0;
hose->last_busno = bus_range ? bus_range[1] : 0xff;
(hose)->ops = &tsi108_direct_pci_ops;
printk(KERN_INFO "Found tsi108 PCI host bridge at 0x%08x. "
"Firmware bus number: %d->%d\n",
rsrc.start, hose->first_busno, hose->last_busno);
/* Interpret the "ranges" property */
/* This also maps the I/O region and sets isa_io/mem_base */
pci_process_bridge_OF_ranges(hose, dev, primary);
return 0;
}
/*
* Low level utility functions
*/
static void tsi108_pci_int_mask(u_int irq)
{
u_int irp_cfg;
int int_line = (irq - IRQ_PCI_INTAD_BASE);
irp_cfg = tsi108_read_reg(TSI108_PCI_OFFSET + TSI108_PCI_IRP_CFG_CTL);
mb();
irp_cfg |= (1 << int_line); /* INTx_DIR = output */
irp_cfg &= ~(3 << (8 + (int_line * 2))); /* INTx_TYPE = unused */
tsi108_write_reg(TSI108_PCI_OFFSET + TSI108_PCI_IRP_CFG_CTL, irp_cfg);
mb();
irp_cfg = tsi108_read_reg(TSI108_PCI_OFFSET + TSI108_PCI_IRP_CFG_CTL);
}
static void tsi108_pci_int_unmask(u_int irq)
{
u_int irp_cfg;
int int_line = (irq - IRQ_PCI_INTAD_BASE);
irp_cfg = tsi108_read_reg(TSI108_PCI_OFFSET + TSI108_PCI_IRP_CFG_CTL);
mb();
irp_cfg &= ~(1 << int_line);
irp_cfg |= (3 << (8 + (int_line * 2)));
tsi108_write_reg(TSI108_PCI_OFFSET + TSI108_PCI_IRP_CFG_CTL, irp_cfg);
mb();
}
static void init_pci_source(void)
{
tsi108_write_reg(TSI108_PCI_OFFSET + TSI108_PCI_IRP_CFG_CTL,
0x0000ff00);
tsi108_write_reg(TSI108_PCI_OFFSET + TSI108_PCI_IRP_ENABLE,
TSI108_PCI_IRP_ENABLE_P_INT);
mb();
}
static inline unsigned int get_pci_source(void)
{
u_int temp = 0;
int irq = -1;
int i;
u_int pci_irp_stat;
static int mask = 0;
/* Read PCI/X block interrupt status register */
pci_irp_stat = tsi108_read_reg(TSI108_PCI_OFFSET + TSI108_PCI_IRP_STAT);
mb();
if (pci_irp_stat & TSI108_PCI_IRP_STAT_P_INT) {
/* Process Interrupt from PCI bus INTA# - INTD# lines */
temp =
tsi108_read_reg(TSI108_PCI_OFFSET +
TSI108_PCI_IRP_INTAD) & 0xf;
mb();
for (i = 0; i < 4; i++, mask++) {
if (temp & (1 << mask % 4)) {
irq = IRQ_PCI_INTA + mask % 4;
mask++;
break;
}
}
/* Disable interrupts from PCI block */
temp = tsi108_read_reg(TSI108_PCI_OFFSET + TSI108_PCI_IRP_ENABLE);
tsi108_write_reg(TSI108_PCI_OFFSET + TSI108_PCI_IRP_ENABLE,
temp & ~TSI108_PCI_IRP_ENABLE_P_INT);
mb();
(void)tsi108_read_reg(TSI108_PCI_OFFSET + TSI108_PCI_IRP_ENABLE);
mb();
}
#ifdef DEBUG
else {
printk("TSI108_PIC: error in TSI108_PCI_IRP_STAT\n");
pci_irp_stat =
tsi108_read_reg(TSI108_PCI_OFFSET + TSI108_PCI_IRP_STAT);
temp =
tsi108_read_reg(TSI108_PCI_OFFSET + TSI108_PCI_IRP_INTAD);
mb();
printk(">> stat=0x%08x intad=0x%08x ", pci_irp_stat, temp);
temp =
tsi108_read_reg(TSI108_PCI_OFFSET + TSI108_PCI_IRP_CFG_CTL);
mb();
printk("cfg_ctl=0x%08x ", temp);
temp =
tsi108_read_reg(TSI108_PCI_OFFSET + TSI108_PCI_IRP_ENABLE);
mb();
printk("irp_enable=0x%08x\n", temp);
}
#endif /* end of DEBUG */
return irq;
}
/*
* Linux descriptor level callbacks
*/
static void tsi108_pci_irq_enable(u_int irq)
{
tsi108_pci_int_unmask(irq);
}
static void tsi108_pci_irq_disable(u_int irq)
{
tsi108_pci_int_mask(irq);
}
static void tsi108_pci_irq_ack(u_int irq)
{
tsi108_pci_int_mask(irq);
}
static void tsi108_pci_irq_end(u_int irq)
{
tsi108_pci_int_unmask(irq);
/* Enable interrupts from PCI block */
tsi108_write_reg(TSI108_PCI_OFFSET + TSI108_PCI_IRP_ENABLE,
tsi108_read_reg(TSI108_PCI_OFFSET +
TSI108_PCI_IRP_ENABLE) |
TSI108_PCI_IRP_ENABLE_P_INT);
mb();
}
/*
* Interrupt controller descriptor for cascaded PCI interrupt controller.
*/
static struct irq_chip tsi108_pci_irq = {
.typename = "tsi108_PCI_int",
.mask = tsi108_pci_irq_disable,
.ack = tsi108_pci_irq_ack,
.end = tsi108_pci_irq_end,
.unmask = tsi108_pci_irq_enable,
};
static int pci_irq_host_xlate(struct irq_host *h, struct device_node *ct,
u32 *intspec, unsigned int intsize,
irq_hw_number_t *out_hwirq, unsigned int *out_flags)
{
*out_hwirq = intspec[0];
*out_flags = IRQ_TYPE_LEVEL_HIGH;
return 0;
}
static int pci_irq_host_map(struct irq_host *h, unsigned int virq,
irq_hw_number_t hw)
{ unsigned int irq;
DBG("%s(%d, 0x%lx)\n", __func__, virq, hw);
if ((virq >= 1) && (virq <= 4)){
irq = virq + IRQ_PCI_INTAD_BASE - 1;
get_irq_desc(irq)->status |= IRQ_LEVEL;
set_irq_chip(irq, &tsi108_pci_irq);
}
return 0;
}
static struct irq_host_ops pci_irq_host_ops = {
.map = pci_irq_host_map,
.xlate = pci_irq_host_xlate,
};
/*
* Exported functions
*/
/*
* The Tsi108 PCI interrupts initialization routine.
*
* The INTA# - INTD# interrupts on the PCI bus are reported by the PCI block
* to the MPIC using single interrupt source (IRQ_TSI108_PCI). Therefore the
* PCI block has to be treated as a cascaded interrupt controller connected
* to the MPIC.
*/
void __init tsi108_pci_int_init(struct device_node *node)
{
DBG("Tsi108_pci_int_init: initializing PCI interrupts\n");
pci_irq_host = irq_alloc_host(node, IRQ_HOST_MAP_LEGACY,
0, &pci_irq_host_ops, 0);
if (pci_irq_host == NULL) {
printk(KERN_ERR "pci_irq_host: failed to allocate irq host !\n");
return;
}
init_pci_source();
}
void tsi108_irq_cascade(unsigned int irq, struct irq_desc *desc)
{
unsigned int cascade_irq = get_pci_source();
if (cascade_irq != NO_IRQ)
generic_handle_irq(cascade_irq);
desc->chip->eoi(irq);
}
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