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f-stack/freebsd/mips/atheros/ar724x_pci.c

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/*-
* Copyright (c) 2009, Oleksandr Tymoshenko <gonzo@FreeBSD.org>
* Copyright (c) 2011, Luiz Otavio O Souza.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice unmodified, this list of conditions, and the following
* disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include "opt_ar71xx.h"
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/bus.h>
#include <sys/interrupt.h>
#include <sys/malloc.h>
#include <sys/kernel.h>
#include <sys/module.h>
#include <sys/rman.h>
#include <vm/vm.h>
#include <vm/pmap.h>
#include <vm/vm_extern.h>
#include <machine/bus.h>
#include <machine/cpu.h>
#include <machine/intr_machdep.h>
#include <dev/pci/pcivar.h>
#include <dev/pci/pcireg.h>
#include <dev/pci/pcib_private.h>
#include "pcib_if.h"
#include <mips/atheros/ar71xxreg.h>
#include <mips/atheros/ar724xreg.h>
#include <mips/atheros/ar71xx_setup.h>
#include <mips/atheros/ar71xx_pci_bus_space.h>
#include <mips/atheros/ar71xx_cpudef.h>
#ifdef AR71XX_ATH_EEPROM
#include <mips/atheros/ar71xx_fixup.h>
#endif /* AR71XX_ATH_EEPROM */
#undef AR724X_PCI_DEBUG
#ifdef AR724X_PCI_DEBUG
#define dprintf printf
#else
#define dprintf(x, arg...)
#endif
struct ar71xx_pci_softc {
device_t sc_dev;
int sc_busno;
struct rman sc_mem_rman;
struct rman sc_irq_rman;
struct intr_event *sc_eventstab[AR71XX_PCI_NIRQS];
mips_intrcnt_t sc_intr_counter[AR71XX_PCI_NIRQS];
struct resource *sc_irq;
void *sc_ih;
};
static int ar724x_pci_setup_intr(device_t, device_t, struct resource *, int,
driver_filter_t *, driver_intr_t *, void *, void **);
static int ar724x_pci_teardown_intr(device_t, device_t, struct resource *,
void *);
static int ar724x_pci_intr(void *);
static void
ar724x_pci_write(uint32_t reg, uint32_t offset, uint32_t data, int bytes)
{
uint32_t val, mask, shift;
/* Register access is 32-bit aligned */
shift = (offset & 3) * 8;
if (bytes % 4)
mask = (1 << (bytes * 8)) - 1;
else
mask = 0xffffffff;
val = ATH_READ_REG(reg + (offset & ~3));
val &= ~(mask << shift);
val |= ((data & mask) << shift);
ATH_WRITE_REG(reg + (offset & ~3), val);
dprintf("%s: %#x/%#x addr=%#x, data=%#x(%#x), bytes=%d\n", __func__,
reg, reg + (offset & ~3), offset, data, val, bytes);
}
static uint32_t
ar724x_pci_read_config(device_t dev, u_int bus, u_int slot, u_int func,
u_int reg, int bytes)
{
uint32_t data, shift, mask;
/* Register access is 32-bit aligned */
shift = (reg & 3) * 8;
/* Create a mask based on the width, post-shift */
if (bytes == 2)
mask = 0xffff;
else if (bytes == 1)
mask = 0xff;
else
mask = 0xffffffff;
dprintf("%s: tag (%x, %x, %x) reg %d(%d)\n", __func__, bus, slot,
func, reg, bytes);
if ((bus == 0) && (slot == 0) && (func == 0))
data = ATH_READ_REG(AR724X_PCI_CFG_BASE + (reg & ~3));
else
data = -1;
/* Get request bytes from 32-bit word */
data = (data >> shift) & mask;
dprintf("%s: read 0x%x\n", __func__, data);
return (data);
}
static void
ar724x_pci_write_config(device_t dev, u_int bus, u_int slot, u_int func,
u_int reg, uint32_t data, int bytes)
{
dprintf("%s: tag (%x, %x, %x) reg %d(%d): %x\n", __func__, bus, slot,
func, reg, bytes, data);
if ((bus != 0) || (slot != 0) || (func != 0))
return;
/*
* WAR for BAR issue on AR7240 - We are unable to access the PCI
* device space if we set the BAR with proper base address.
*
* However, we _do_ want to allow programming in the probe value
* (0xffffffff) so the PCI code can find out how big the memory
* map is for this device. Without it, it'll think the memory
* map is 32 bits wide, the PCI code will then end up thinking
* the register window is '0' and fail to allocate resources.
*/
if (reg == PCIR_BAR(0) && bytes == 4
&& ar71xx_soc == AR71XX_SOC_AR7240
&& data != 0xffffffff)
ar724x_pci_write(AR724X_PCI_CFG_BASE, reg, 0xffff, bytes);
else
ar724x_pci_write(AR724X_PCI_CFG_BASE, reg, data, bytes);
}
static void
ar724x_pci_mask_irq(void *source)
{
uint32_t reg;
unsigned int irq = (unsigned int)source;
/* XXX - Only one interrupt ? Only one device ? */
if (irq != AR71XX_PCI_IRQ_START)
return;
/* Update the interrupt mask reg */
reg = ATH_READ_REG(AR724X_PCI_INTR_MASK);
ATH_WRITE_REG(AR724X_PCI_INTR_MASK,
reg & ~AR724X_PCI_INTR_DEV0);
/* Clear any pending interrupt */
reg = ATH_READ_REG(AR724X_PCI_INTR_STATUS);
ATH_WRITE_REG(AR724X_PCI_INTR_STATUS,
reg | AR724X_PCI_INTR_DEV0);
}
static void
ar724x_pci_unmask_irq(void *source)
{
uint32_t reg;
unsigned int irq = (unsigned int)source;
/* XXX */
if (irq != AR71XX_PCI_IRQ_START)
return;
/* Update the interrupt mask reg */
reg = ATH_READ_REG(AR724X_PCI_INTR_MASK);
ATH_WRITE_REG(AR724X_PCI_INTR_MASK,
reg | AR724X_PCI_INTR_DEV0);
}
static int
ar724x_pci_setup(device_t dev)
{
uint32_t reg;
/* setup COMMAND register */
reg = PCIM_CMD_BUSMASTEREN | PCIM_CMD_MEMEN | PCIM_CMD_SERRESPEN |
PCIM_CMD_BACKTOBACK | PCIM_CMD_PERRESPEN | PCIM_CMD_MWRICEN;
ar724x_pci_write(AR724X_PCI_CRP_BASE, PCIR_COMMAND, reg, 2);
ar724x_pci_write(AR724X_PCI_CRP_BASE, 0x20, 0x1ff01000, 4);
ar724x_pci_write(AR724X_PCI_CRP_BASE, 0x24, 0x1ff01000, 4);
reg = ATH_READ_REG(AR724X_PCI_RESET);
if (reg != 0x7) {
DELAY(100000);
ATH_WRITE_REG(AR724X_PCI_RESET, 0);
DELAY(100);
ATH_WRITE_REG(AR724X_PCI_RESET, 4);
DELAY(100000);
}
if (ar71xx_soc == AR71XX_SOC_AR7240)
reg = AR724X_PCI_APP_LTSSM_ENABLE;
else
reg = 0x1ffc1;
ATH_WRITE_REG(AR724X_PCI_APP, reg);
/* Flush write */
(void) ATH_READ_REG(AR724X_PCI_APP);
DELAY(1000);
reg = ATH_READ_REG(AR724X_PCI_RESET);
if ((reg & AR724X_PCI_RESET_LINK_UP) == 0) {
device_printf(dev, "no PCIe controller found\n");
return (ENXIO);
}
if (ar71xx_soc == AR71XX_SOC_AR7241 ||
ar71xx_soc == AR71XX_SOC_AR7242) {
reg = ATH_READ_REG(AR724X_PCI_APP);
reg |= (1 << 16);
ATH_WRITE_REG(AR724X_PCI_APP, reg);
}
return (0);
}
#ifdef AR71XX_ATH_EEPROM
#define AR5416_EEPROM_MAGIC 0xa55a
/*
* XXX - This should not be here ! And this looks like Atheros (if_ath) only.
*/
static void
ar724x_pci_fixup(device_t dev, long flash_addr, int len)
{
uint32_t bar0, reg, val;
uint16_t *cal_data = (uint16_t *) MIPS_PHYS_TO_KSEG1(flash_addr);
#if 0
if (cal_data[0] != AR5416_EEPROM_MAGIC) {
device_printf(dev, "%s: Invalid calibration data from 0x%x\n",
__func__, (uintptr_t) flash_addr);
return;
}
#endif
/* Save bar(0) address - just to flush bar(0) (SoC WAR) ? */
bar0 = ar724x_pci_read_config(dev, 0, 0, 0, PCIR_BAR(0), 4);
/* Write temporary BAR0 to map the NIC into a fixed location */
ar724x_pci_write_config(dev, 0, 0, 0, PCIR_BAR(0),
AR71XX_PCI_MEM_BASE, 4);
val = ar724x_pci_read_config(dev, 0, 0, 0, PCIR_COMMAND, 2);
val |= (PCIM_CMD_BUSMASTEREN | PCIM_CMD_MEMEN);
ar724x_pci_write_config(dev, 0, 0, 0, PCIR_COMMAND, val, 2);
/* set pointer to first reg address */
cal_data += 3;
while (*cal_data != 0xffff) {
reg = *cal_data++;
val = *cal_data++;
val |= (*cal_data++) << 16;
if (bootverbose)
printf(" 0x%08x=0x%04x\n", reg, val);
/* Write eeprom fixup data to device memory */
ATH_WRITE_REG(AR71XX_PCI_MEM_BASE + reg, val);
DELAY(100);
}
val = ar724x_pci_read_config(dev, 0, 0, 0, PCIR_COMMAND, 2);
val &= ~(PCIM_CMD_BUSMASTEREN | PCIM_CMD_MEMEN);
ar724x_pci_write_config(dev, 0, 0, 0, PCIR_COMMAND, val, 2);
/* Write the saved bar(0) address */
ar724x_pci_write_config(dev, 0, 0, 0, PCIR_BAR(0), bar0, 4);
}
#undef AR5416_EEPROM_MAGIC
/*
* XXX This is (mostly) duplicated with ar71xx_pci.c.
* It should at some point be fixed.
*/
static void
ar724x_pci_slot_fixup(device_t dev)
{
long int flash_addr;
char buf[64];
int size;
/*
* Check whether the given slot has a hint to poke.
*/
if (bootverbose)
device_printf(dev, "%s: checking dev %s, %d/%d/%d\n",
__func__, device_get_nameunit(dev), 0, 0, 0);
snprintf(buf, sizeof(buf), "bus.%d.%d.%d.ath_fixup_addr",
0, 0, 0);
if (resource_long_value(device_get_name(dev), device_get_unit(dev),
buf, &flash_addr) == 0) {
snprintf(buf, sizeof(buf), "bus.%d.%d.%d.ath_fixup_size",
0, 0, 0);
if (resource_int_value(device_get_name(dev),
device_get_unit(dev), buf, &size) != 0) {
device_printf(dev,
"%s: missing hint '%s', aborting EEPROM\n",
__func__, buf);
return;
}
device_printf(dev, "found EEPROM at 0x%lx on %d.%d.%d\n",
flash_addr, 0, 0, 0);
ar724x_pci_fixup(dev, flash_addr, size);
ar71xx_pci_slot_create_eeprom_firmware(dev, 0, 0, 0,
flash_addr, size);
}
}
#endif /* AR71XX_ATH_EEPROM */
static int
ar724x_pci_probe(device_t dev)
{
return (BUS_PROBE_NOWILDCARD);
}
static int
ar724x_pci_attach(device_t dev)
{
struct ar71xx_pci_softc *sc = device_get_softc(dev);
int rid = 0;
sc->sc_mem_rman.rm_type = RMAN_ARRAY;
sc->sc_mem_rman.rm_descr = "ar724x PCI memory window";
if (rman_init(&sc->sc_mem_rman) != 0 ||
rman_manage_region(&sc->sc_mem_rman, AR71XX_PCI_MEM_BASE,
AR71XX_PCI_MEM_BASE + AR71XX_PCI_MEM_SIZE - 1) != 0) {
panic("ar724x_pci_attach: failed to set up I/O rman");
}
sc->sc_irq_rman.rm_type = RMAN_ARRAY;
sc->sc_irq_rman.rm_descr = "ar724x PCI IRQs";
if (rman_init(&sc->sc_irq_rman) != 0 ||
rman_manage_region(&sc->sc_irq_rman, AR71XX_PCI_IRQ_START,
AR71XX_PCI_IRQ_END) != 0)
panic("ar724x_pci_attach: failed to set up IRQ rman");
/* Disable interrupts */
ATH_WRITE_REG(AR724X_PCI_INTR_STATUS, 0);
ATH_WRITE_REG(AR724X_PCI_INTR_MASK, 0);
/* Hook up our interrupt handler. */
if ((sc->sc_irq = bus_alloc_resource_any(dev, SYS_RES_IRQ, &rid,
RF_SHAREABLE | RF_ACTIVE)) == NULL) {
device_printf(dev, "unable to allocate IRQ resource\n");
return (ENXIO);
}
if ((bus_setup_intr(dev, sc->sc_irq, INTR_TYPE_MISC,
ar724x_pci_intr, NULL, sc, &sc->sc_ih))) {
device_printf(dev,
"WARNING: unable to register interrupt handler\n");
return (ENXIO);
}
/* Reset PCIe core and PCIe PHY */
ar71xx_device_stop(AR724X_RESET_PCIE);
ar71xx_device_stop(AR724X_RESET_PCIE_PHY);
ar71xx_device_stop(AR724X_RESET_PCIE_PHY_SERIAL);
DELAY(100);
ar71xx_device_start(AR724X_RESET_PCIE_PHY_SERIAL);
DELAY(100);
ar71xx_device_start(AR724X_RESET_PCIE_PHY);
ar71xx_device_start(AR724X_RESET_PCIE);
if (ar724x_pci_setup(dev))
return (ENXIO);
#ifdef AR71XX_ATH_EEPROM
ar724x_pci_slot_fixup(dev);
#endif /* AR71XX_ATH_EEPROM */
/* Fixup internal PCI bridge */
ar724x_pci_write_config(dev, 0, 0, 0, PCIR_COMMAND,
PCIM_CMD_BUSMASTEREN | PCIM_CMD_MEMEN
| PCIM_CMD_SERRESPEN | PCIM_CMD_BACKTOBACK
| PCIM_CMD_PERRESPEN | PCIM_CMD_MWRICEN, 2);
device_add_child(dev, "pci", -1);
return (bus_generic_attach(dev));
}
static int
ar724x_pci_read_ivar(device_t dev, device_t child, int which, uintptr_t *result)
{
struct ar71xx_pci_softc *sc = device_get_softc(dev);
switch (which) {
case PCIB_IVAR_DOMAIN:
*result = 0;
return (0);
case PCIB_IVAR_BUS:
*result = sc->sc_busno;
return (0);
}
return (ENOENT);
}
static int
ar724x_pci_write_ivar(device_t dev, device_t child, int which, uintptr_t result)
{
struct ar71xx_pci_softc * sc = device_get_softc(dev);
switch (which) {
case PCIB_IVAR_BUS:
sc->sc_busno = result;
return (0);
}
return (ENOENT);
}
static struct resource *
ar724x_pci_alloc_resource(device_t bus, device_t child, int type, int *rid,
rman_res_t start, rman_res_t end, rman_res_t count, u_int flags)
{
struct ar71xx_pci_softc *sc = device_get_softc(bus);
struct resource *rv;
struct rman *rm;
switch (type) {
case SYS_RES_IRQ:
rm = &sc->sc_irq_rman;
break;
case SYS_RES_MEMORY:
rm = &sc->sc_mem_rman;
break;
default:
return (NULL);
}
rv = rman_reserve_resource(rm, start, end, count, flags, child);
if (rv == NULL)
return (NULL);
rman_set_rid(rv, *rid);
if (flags & RF_ACTIVE) {
if (bus_activate_resource(child, type, *rid, rv)) {
rman_release_resource(rv);
return (NULL);
}
}
return (rv);
}
static int
ar724x_pci_activate_resource(device_t bus, device_t child, int type, int rid,
struct resource *r)
{
int res = (BUS_ACTIVATE_RESOURCE(device_get_parent(bus),
child, type, rid, r));
if (!res) {
switch(type) {
case SYS_RES_MEMORY:
case SYS_RES_IOPORT:
rman_set_bustag(r, ar71xx_bus_space_pcimem);
break;
}
}
return (res);
}
static int
ar724x_pci_setup_intr(device_t bus, device_t child, struct resource *ires,
int flags, driver_filter_t *filt, driver_intr_t *handler,
void *arg, void **cookiep)
{
struct ar71xx_pci_softc *sc = device_get_softc(bus);
struct intr_event *event;
int irq, error;
irq = rman_get_start(ires);
if (irq > AR71XX_PCI_IRQ_END)
panic("%s: bad irq %d", __func__, irq);
event = sc->sc_eventstab[irq];
if (event == NULL) {
error = intr_event_create(&event, (void *)irq, 0, irq,
ar724x_pci_mask_irq, ar724x_pci_unmask_irq, NULL, NULL,
"pci intr%d:", irq);
if (error == 0) {
sc->sc_eventstab[irq] = event;
sc->sc_intr_counter[irq] =
mips_intrcnt_create(event->ie_name);
}
else
return error;
}
intr_event_add_handler(event, device_get_nameunit(child), filt,
handler, arg, intr_priority(flags), flags, cookiep);
mips_intrcnt_setname(sc->sc_intr_counter[irq], event->ie_fullname);
ar724x_pci_unmask_irq((void*)irq);
return (0);
}
static int
ar724x_pci_teardown_intr(device_t dev, device_t child, struct resource *ires,
void *cookie)
{
struct ar71xx_pci_softc *sc = device_get_softc(dev);
int irq, result;
irq = rman_get_start(ires);
if (irq > AR71XX_PCI_IRQ_END)
panic("%s: bad irq %d", __func__, irq);
if (sc->sc_eventstab[irq] == NULL)
panic("Trying to teardown unoccupied IRQ");
ar724x_pci_mask_irq((void*)irq);
result = intr_event_remove_handler(cookie);
if (!result)
sc->sc_eventstab[irq] = NULL;
return (result);
}
static int
ar724x_pci_intr(void *arg)
{
struct ar71xx_pci_softc *sc = arg;
struct intr_event *event;
uint32_t reg, irq, mask;
reg = ATH_READ_REG(AR724X_PCI_INTR_STATUS);
mask = ATH_READ_REG(AR724X_PCI_INTR_MASK);
/*
* Handle only unmasked interrupts
*/
reg &= mask;
if (reg & AR724X_PCI_INTR_DEV0) {
irq = AR71XX_PCI_IRQ_START;
event = sc->sc_eventstab[irq];
if (!event || TAILQ_EMPTY(&event->ie_handlers)) {
printf("Stray IRQ %d\n", irq);
return (FILTER_STRAY);
}
/* Flush pending memory transactions */
ar71xx_device_flush_ddr(AR71XX_CPU_DDR_FLUSH_PCIE);
/* TODO: frame instead of NULL? */
intr_event_handle(event, NULL);
mips_intrcnt_inc(sc->sc_intr_counter[irq]);
}
return (FILTER_HANDLED);
}
static int
ar724x_pci_maxslots(device_t dev)
{
return (PCI_SLOTMAX);
}
static int
ar724x_pci_route_interrupt(device_t pcib, device_t device, int pin)
{
return (pci_get_slot(device));
}
static device_method_t ar724x_pci_methods[] = {
/* Device interface */
DEVMETHOD(device_probe, ar724x_pci_probe),
DEVMETHOD(device_attach, ar724x_pci_attach),
DEVMETHOD(device_shutdown, bus_generic_shutdown),
DEVMETHOD(device_suspend, bus_generic_suspend),
DEVMETHOD(device_resume, bus_generic_resume),
/* Bus interface */
DEVMETHOD(bus_read_ivar, ar724x_pci_read_ivar),
DEVMETHOD(bus_write_ivar, ar724x_pci_write_ivar),
DEVMETHOD(bus_alloc_resource, ar724x_pci_alloc_resource),
DEVMETHOD(bus_release_resource, bus_generic_release_resource),
DEVMETHOD(bus_activate_resource, ar724x_pci_activate_resource),
DEVMETHOD(bus_deactivate_resource, bus_generic_deactivate_resource),
DEVMETHOD(bus_setup_intr, ar724x_pci_setup_intr),
DEVMETHOD(bus_teardown_intr, ar724x_pci_teardown_intr),
/* pcib interface */
DEVMETHOD(pcib_maxslots, ar724x_pci_maxslots),
DEVMETHOD(pcib_read_config, ar724x_pci_read_config),
DEVMETHOD(pcib_write_config, ar724x_pci_write_config),
DEVMETHOD(pcib_route_interrupt, ar724x_pci_route_interrupt),
DEVMETHOD_END
};
static driver_t ar724x_pci_driver = {
"pcib",
ar724x_pci_methods,
sizeof(struct ar71xx_pci_softc),
};
static devclass_t ar724x_pci_devclass;
DRIVER_MODULE(ar724x_pci, nexus, ar724x_pci_driver, ar724x_pci_devclass, 0, 0);
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