freebsd-skq/sys/dev/bhnd/bhnd.c
adrian 240c5e5159 [bhnd] Clean up bhnd resource handling and inherited bus methods
To facilitate use by SoC implementors working with bhnd-inheriting fdt/nexus
drivers:

* Splits bhnd_bus method implementations into generic bus implementations
  (bhnd_bus_generic) and generic bhnd(4) driver implementations (bhnd_generic)
* Simplifies bhnd resource handling, allowing bhnd bus implementations to
  support bhnd resource activation by implementing the standard BUS_*
  resource APIs and BHND_BUS_ACTIVATE_RESOURCE().

Submitted by:	Landon Fuller <landonf@landonf.org>
Differential Revision:	https://reviews.freebsd.org/D5758
2016-04-19 15:53:57 +00:00

697 lines
19 KiB
C

/*-
* Copyright (c) 2015 Landon Fuller <landon@landonf.org>
* 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, this list of conditions and the following disclaimer,
* without modification.
* 2. Redistributions in binary form must reproduce at minimum a disclaimer
* similar to the "NO WARRANTY" disclaimer below ("Disclaimer") and any
* redistribution must be conditioned upon including a substantially
* similar Disclaimer requirement for further binary redistribution.
*
* NO WARRANTY
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF NONINFRINGEMENT, MERCHANTIBILITY
* AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
* THE COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR 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 DAMAGES.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
/*
* Broadcom Home Networking Division (HND) Bus Driver.
*
* The Broadcom HND family of devices consists of both SoCs and host-connected
* networking chipsets containing a common family of Broadcom IP cores,
* including an integrated MIPS and/or ARM cores.
*
* HND devices expose a nearly identical interface whether accessible over a
* native SoC interconnect, or when connected via a host interface such as
* PCIe. As a result, the majority of hardware support code should be re-usable
* across host drivers for HND networking chipsets, as well as FreeBSD support
* for Broadcom MIPS/ARM HND SoCs.
*
* Earlier HND models used the siba(4) on-chip interconnect, while later models
* use bcma(4); the programming model is almost entirely independent
* of the actual underlying interconect.
*/
#include <sys/param.h>
#include <sys/kernel.h>
#include <sys/bus.h>
#include <sys/module.h>
#include <sys/systm.h>
#include <machine/bus.h>
#include <sys/rman.h>
#include <machine/resource.h>
#include "bhnd.h"
#include "bhndvar.h"
#include "bhnd_nvram_if.h"
MALLOC_DEFINE(M_BHND, "bhnd", "bhnd bus data structures");
/**
* bhnd_generic_probe_nomatch() reporting configuration.
*/
static const struct bhnd_nomatch {
uint16_t vendor; /**< core designer */
uint16_t device; /**< core id */
bool if_verbose; /**< print when bootverbose is set. */
} bhnd_nomatch_table[] = {
{ BHND_MFGID_ARM, BHND_COREID_OOB_ROUTER, true },
{ BHND_MFGID_ARM, BHND_COREID_EROM, true },
{ BHND_MFGID_ARM, BHND_COREID_PL301, true },
{ BHND_MFGID_ARM, BHND_COREID_APB_BRIDGE, true },
{ BHND_MFGID_ARM, BHND_COREID_AXI_UNMAPPED, false },
{ BHND_MFGID_INVALID, BHND_COREID_INVALID, false }
};
static device_t find_nvram_child(device_t dev);
static int compare_ascending_probe_order(const void *lhs,
const void *rhs);
static int compare_descending_probe_order(const void *lhs,
const void *rhs);
/**
* Default bhnd(4) bus driver implementation of DEVICE_ATTACH().
*
* This implementation calls device_probe_and_attach() for each of the device's
* children, in bhnd probe order.
*/
int
bhnd_generic_attach(device_t dev)
{
device_t *devs;
int ndevs;
int error;
if (device_is_attached(dev))
return (EBUSY);
if ((error = device_get_children(dev, &devs, &ndevs)))
return (error);
qsort(devs, ndevs, sizeof(*devs), compare_ascending_probe_order);
for (int i = 0; i < ndevs; i++) {
device_t child = devs[i];
device_probe_and_attach(child);
}
free(devs, M_TEMP);
return (0);
}
/**
* Default bhnd(4) bus driver implementation of DEVICE_DETACH().
*
* This implementation calls device_detach() for each of the the device's
* children, in reverse bhnd probe order, terminating if any call to
* device_detach() fails.
*/
int
bhnd_generic_detach(device_t dev)
{
device_t *devs;
int ndevs;
int error;
if (!device_is_attached(dev))
return (EBUSY);
if ((error = device_get_children(dev, &devs, &ndevs)))
return (error);
/* Detach in the reverse of attach order */
qsort(devs, ndevs, sizeof(*devs), compare_descending_probe_order);
for (int i = 0; i < ndevs; i++) {
device_t child = devs[i];
/* Terminate on first error */
if ((error = device_detach(child)))
goto cleanup;
}
cleanup:
free(devs, M_TEMP);
return (error);
}
/**
* Default bhnd(4) bus driver implementation of DEVICE_SHUTDOWN().
*
* This implementation calls device_shutdown() for each of the device's
* children, in reverse bhnd probe order, terminating if any call to
* device_shutdown() fails.
*/
int
bhnd_generic_shutdown(device_t dev)
{
device_t *devs;
int ndevs;
int error;
if (!device_is_attached(dev))
return (EBUSY);
if ((error = device_get_children(dev, &devs, &ndevs)))
return (error);
/* Shutdown in the reverse of attach order */
qsort(devs, ndevs, sizeof(*devs), compare_descending_probe_order);
for (int i = 0; i < ndevs; i++) {
device_t child = devs[i];
/* Terminate on first error */
if ((error = device_shutdown(child)))
goto cleanup;
}
cleanup:
free(devs, M_TEMP);
return (error);
}
/**
* Default bhnd(4) bus driver implementation of DEVICE_RESUME().
*
* This implementation calls BUS_RESUME_CHILD() for each of the device's
* children in bhnd probe order, terminating if any call to BUS_RESUME_CHILD()
* fails.
*/
int
bhnd_generic_resume(device_t dev)
{
device_t *devs;
int ndevs;
int error;
if (!device_is_attached(dev))
return (EBUSY);
if ((error = device_get_children(dev, &devs, &ndevs)))
return (error);
qsort(devs, ndevs, sizeof(*devs), compare_ascending_probe_order);
for (int i = 0; i < ndevs; i++) {
device_t child = devs[i];
/* Terminate on first error */
if ((error = BUS_RESUME_CHILD(device_get_parent(child), child)))
goto cleanup;
}
cleanup:
free(devs, M_TEMP);
return (error);
}
/**
* Default bhnd(4) bus driver implementation of DEVICE_SUSPEND().
*
* This implementation calls BUS_SUSPEND_CHILD() for each of the device's
* children in reverse bhnd probe order. If any call to BUS_SUSPEND_CHILD()
* fails, the suspend operation is terminated and any devices that were
* suspended are resumed immediately by calling their BUS_RESUME_CHILD()
* methods.
*/
int
bhnd_generic_suspend(device_t dev)
{
device_t *devs;
int ndevs;
int error;
if (!device_is_attached(dev))
return (EBUSY);
if ((error = device_get_children(dev, &devs, &ndevs)))
return (error);
/* Suspend in the reverse of attach order */
qsort(devs, ndevs, sizeof(*devs), compare_descending_probe_order);
for (int i = 0; i < ndevs; i++) {
device_t child = devs[i];
error = BUS_SUSPEND_CHILD(device_get_parent(child), child);
/* On error, resume suspended devices and then terminate */
if (error) {
for (int j = 0; j < i; j++) {
BUS_RESUME_CHILD(device_get_parent(devs[j]),
devs[j]);
}
goto cleanup;
}
}
cleanup:
free(devs, M_TEMP);
return (error);
}
/*
* Ascending comparison of bhnd device's probe order.
*/
static int
compare_ascending_probe_order(const void *lhs, const void *rhs)
{
device_t ldev, rdev;
int lorder, rorder;
ldev = (*(const device_t *) lhs);
rdev = (*(const device_t *) rhs);
lorder = BHND_BUS_GET_PROBE_ORDER(device_get_parent(ldev), ldev);
rorder = BHND_BUS_GET_PROBE_ORDER(device_get_parent(rdev), rdev);
if (lorder < rorder) {
return (-1);
} else if (lorder > rorder) {
return (1);
} else {
return (0);
}
}
/*
* Descending comparison of bhnd device's probe order.
*/
static int
compare_descending_probe_order(const void *lhs, const void *rhs)
{
return (compare_ascending_probe_order(rhs, lhs));
}
/**
* Default bhnd(4) bus driver implementation of BHND_BUS_GET_PROBE_ORDER().
*
* This implementation determines probe ordering based on the device's class
* and other properties, including whether the device is serving as a host
* bridge.
*/
int
bhnd_generic_get_probe_order(device_t dev, device_t child)
{
switch (bhnd_get_class(child)) {
case BHND_DEVCLASS_CC:
return (BHND_PROBE_BUS + BHND_PROBE_ORDER_FIRST);
case BHND_DEVCLASS_CC_B:
/* fall through */
case BHND_DEVCLASS_PMU:
return (BHND_PROBE_BUS + BHND_PROBE_ORDER_EARLY);
case BHND_DEVCLASS_SOC_ROUTER:
return (BHND_PROBE_BUS + BHND_PROBE_ORDER_LATE);
case BHND_DEVCLASS_SOC_BRIDGE:
return (BHND_PROBE_BUS + BHND_PROBE_ORDER_LAST);
case BHND_DEVCLASS_CPU:
return (BHND_PROBE_CPU + BHND_PROBE_ORDER_FIRST);
case BHND_DEVCLASS_RAM:
/* fall through */
case BHND_DEVCLASS_MEMC:
return (BHND_PROBE_CPU + BHND_PROBE_ORDER_EARLY);
case BHND_DEVCLASS_NVRAM:
return (BHND_PROBE_RESOURCE + BHND_PROBE_ORDER_EARLY);
case BHND_DEVCLASS_PCI:
case BHND_DEVCLASS_PCIE:
case BHND_DEVCLASS_PCCARD:
case BHND_DEVCLASS_ENET:
case BHND_DEVCLASS_ENET_MAC:
case BHND_DEVCLASS_ENET_PHY:
case BHND_DEVCLASS_WLAN:
case BHND_DEVCLASS_WLAN_MAC:
case BHND_DEVCLASS_WLAN_PHY:
case BHND_DEVCLASS_EROM:
case BHND_DEVCLASS_OTHER:
case BHND_DEVCLASS_INVALID:
if (bhnd_is_hostb_device(child))
return (BHND_PROBE_ROOT + BHND_PROBE_ORDER_EARLY);
return (BHND_PROBE_DEFAULT);
}
}
/**
* Default bhnd(4) bus driver implementation of BHND_BUS_IS_REGION_VALID().
*
* This implementation assumes that port and region numbers are 0-indexed and
* are allocated non-sparsely, using BHND_BUS_GET_PORT_COUNT() and
* BHND_BUS_GET_REGION_COUNT() to determine if @p port and @p region fall
* within the defined range.
*/
static bool
bhnd_generic_is_region_valid(device_t dev, device_t child,
bhnd_port_type type, u_int port, u_int region)
{
if (port >= bhnd_get_port_count(child, type))
return (false);
if (region >= bhnd_get_region_count(child, type, port))
return (false);
return (true);
}
/**
* Find an NVRAM child device on @p dev, if any.
*
* @retval device_t An NVRAM device.
* @retval NULL If no NVRAM device is found.
*/
static device_t
find_nvram_child(device_t dev)
{
device_t chipc, nvram;
/* Look for a directly-attached NVRAM child */
nvram = device_find_child(dev, devclass_get_name(bhnd_nvram_devclass),
-1);
if (nvram == NULL)
return (NULL);
/* Further checks require a bhnd(4) bus */
if (device_get_devclass(dev) != bhnd_devclass)
return (NULL);
/* Look for a ChipCommon-attached OTP device */
if ((chipc = bhnd_find_child(dev, BHND_DEVCLASS_CC, -1)) != NULL) {
/* Recursively search the ChipCommon device */
if ((nvram = find_nvram_child(chipc)) != NULL)
return (nvram);
}
/* Not found */
return (NULL);
}
/**
* Default bhnd(4) bus driver implementation of BHND_BUS_READ_NVRAM_VAR().
*
* This implementation searches @p dev for a valid NVRAM device. If no NVRAM
* child device is found on @p dev, the request is delegated to the
* BHND_BUS_READ_NVRAM_VAR() method on the parent
* of @p dev.
*/
static int
bhnd_generic_read_nvram_var(device_t dev, device_t child, const char *name,
void *buf, size_t *size)
{
device_t nvram;
/* Try to find an NVRAM device applicable to @p child */
if ((nvram = find_nvram_child(dev)) == NULL)
return (BHND_BUS_READ_NVRAM_VAR(device_get_parent(dev), child,
name, buf, size));
return BHND_NVRAM_GETVAR(nvram, name, buf, size);
}
/**
* Default bhnd(4) bus driver implementation of BUS_PRINT_CHILD().
*
* This implementation requests the device's struct resource_list via
* BUS_GET_RESOURCE_LIST.
*/
int
bhnd_generic_print_child(device_t dev, device_t child)
{
struct resource_list *rl;
int retval = 0;
retval += bus_print_child_header(dev, child);
rl = BUS_GET_RESOURCE_LIST(dev, child);
if (rl != NULL) {
retval += resource_list_print_type(rl, "mem", SYS_RES_MEMORY,
"%#jx");
}
retval += printf(" at core %u", bhnd_get_core_index(child));
retval += bus_print_child_domain(dev, child);
retval += bus_print_child_footer(dev, child);
return (retval);
}
/**
* Default bhnd(4) bus driver implementation of BUS_PROBE_NOMATCH().
*
* This implementation requests the device's struct resource_list via
* BUS_GET_RESOURCE_LIST.
*/
void
bhnd_generic_probe_nomatch(device_t dev, device_t child)
{
struct resource_list *rl;
const struct bhnd_nomatch *nm;
bool report;
/* Fetch reporting configuration for this device */
report = true;
for (nm = bhnd_nomatch_table; nm->device != BHND_COREID_INVALID; nm++) {
if (nm->vendor != bhnd_get_vendor(child))
continue;
if (nm->device != bhnd_get_device(child))
continue;
report = false;
if (bootverbose && nm->if_verbose)
report = true;
break;
}
if (!report)
return;
/* Print the non-matched device info */
device_printf(dev, "<%s %s>", bhnd_get_vendor_name(child),
bhnd_get_device_name(child));
rl = BUS_GET_RESOURCE_LIST(dev, child);
if (rl != NULL)
resource_list_print_type(rl, "mem", SYS_RES_MEMORY, "%#jx");
printf(" at core %u (no driver attached)\n",
bhnd_get_core_index(child));
}
/**
* Default implementation of BUS_CHILD_PNPINFO_STR().
*/
static int
bhnd_child_pnpinfo_str(device_t dev, device_t child, char *buf,
size_t buflen)
{
if (device_get_parent(child) != dev) {
return (BUS_CHILD_PNPINFO_STR(device_get_parent(dev), child,
buf, buflen));
}
snprintf(buf, buflen, "vendor=0x%hx device=0x%hx rev=0x%hhx",
bhnd_get_vendor(child), bhnd_get_device(child),
bhnd_get_hwrev(child));
return (0);
}
/**
* Default implementation of BUS_CHILD_LOCATION_STR().
*/
static int
bhnd_child_location_str(device_t dev, device_t child, char *buf,
size_t buflen)
{
bhnd_addr_t addr;
bhnd_size_t size;
if (device_get_parent(child) != dev) {
return (BUS_CHILD_LOCATION_STR(device_get_parent(dev), child,
buf, buflen));
}
if (bhnd_get_region_addr(child, BHND_PORT_DEVICE, 0, 0, &addr, &size)) {
/* No device default port/region */
if (buflen > 0)
*buf = '\0';
return (0);
}
snprintf(buf, buflen, "port0.0=0x%llx", (unsigned long long) addr);
return (0);
}
/**
* Helper function for implementing BUS_SUSPEND_CHILD().
*
* TODO: Power management
*
* If @p child is not a direct child of @p dev, suspension is delegated to
* the @p dev parent.
*/
int
bhnd_generic_suspend_child(device_t dev, device_t child)
{
if (device_get_parent(child) != dev)
BUS_SUSPEND_CHILD(device_get_parent(dev), child);
return bus_generic_suspend_child(dev, child);
}
/**
* Helper function for implementing BUS_RESUME_CHILD().
*
* TODO: Power management
*
* If @p child is not a direct child of @p dev, suspension is delegated to
* the @p dev parent.
*/
int
bhnd_generic_resume_child(device_t dev, device_t child)
{
if (device_get_parent(child) != dev)
BUS_RESUME_CHILD(device_get_parent(dev), child);
return bus_generic_resume_child(dev, child);
}
/*
* Delegate all indirect I/O to the parent device. When inherited by
* non-bridged bus implementations, resources will never be marked as
* indirect, and these methods should never be called.
*/
static uint8_t
bhnd_read_1(device_t dev, device_t child, struct bhnd_resource *r,
bus_size_t offset)
{
return (BHND_BUS_READ_1(device_get_parent(dev), child, r, offset));
}
static uint16_t
bhnd_read_2(device_t dev, device_t child, struct bhnd_resource *r,
bus_size_t offset)
{
return (BHND_BUS_READ_2(device_get_parent(dev), child, r, offset));
}
static uint32_t
bhnd_read_4(device_t dev, device_t child, struct bhnd_resource *r,
bus_size_t offset)
{
return (BHND_BUS_READ_4(device_get_parent(dev), child, r, offset));
}
static void
bhnd_write_1(device_t dev, device_t child, struct bhnd_resource *r,
bus_size_t offset, uint8_t value)
{
BHND_BUS_WRITE_1(device_get_parent(dev), child, r, offset, value);
}
static void
bhnd_write_2(device_t dev, device_t child, struct bhnd_resource *r,
bus_size_t offset, uint16_t value)
{
BHND_BUS_WRITE_2(device_get_parent(dev), child, r, offset, value);
}
static void
bhnd_write_4(device_t dev, device_t child, struct bhnd_resource *r,
bus_size_t offset, uint32_t value)
{
BHND_BUS_WRITE_4(device_get_parent(dev), child, r, offset, value);
}
static void
bhnd_barrier(device_t dev, device_t child, struct bhnd_resource *r,
bus_size_t offset, bus_size_t length, int flags)
{
BHND_BUS_BARRIER(device_get_parent(dev), child, r, offset, length,
flags);
}
static device_method_t bhnd_methods[] = {
/* Device interface */ \
DEVMETHOD(device_attach, bhnd_generic_attach),
DEVMETHOD(device_detach, bhnd_generic_detach),
DEVMETHOD(device_shutdown, bhnd_generic_shutdown),
DEVMETHOD(device_suspend, bhnd_generic_suspend),
DEVMETHOD(device_resume, bhnd_generic_resume),
/* Bus interface */
DEVMETHOD(bus_probe_nomatch, bhnd_generic_probe_nomatch),
DEVMETHOD(bus_print_child, bhnd_generic_print_child),
DEVMETHOD(bus_child_pnpinfo_str, bhnd_child_pnpinfo_str),
DEVMETHOD(bus_child_location_str, bhnd_child_location_str),
DEVMETHOD(bus_suspend_child, bhnd_generic_suspend_child),
DEVMETHOD(bus_resume_child, bhnd_generic_resume_child),
DEVMETHOD(bus_set_resource, bus_generic_rl_set_resource),
DEVMETHOD(bus_get_resource, bus_generic_rl_get_resource),
DEVMETHOD(bus_delete_resource, bus_generic_rl_delete_resource),
DEVMETHOD(bus_alloc_resource, bus_generic_rl_alloc_resource),
DEVMETHOD(bus_adjust_resource, bus_generic_adjust_resource),
DEVMETHOD(bus_release_resource, bus_generic_rl_release_resource),
DEVMETHOD(bus_activate_resource, bus_generic_activate_resource),
DEVMETHOD(bus_deactivate_resource, bus_generic_deactivate_resource),
DEVMETHOD(bus_setup_intr, bus_generic_setup_intr),
DEVMETHOD(bus_teardown_intr, bus_generic_teardown_intr),
DEVMETHOD(bus_config_intr, bus_generic_config_intr),
DEVMETHOD(bus_bind_intr, bus_generic_bind_intr),
DEVMETHOD(bus_describe_intr, bus_generic_describe_intr),
DEVMETHOD(bus_get_dma_tag, bus_generic_get_dma_tag),
/* BHND interface */
DEVMETHOD(bhnd_bus_get_chipid, bhnd_bus_generic_get_chipid),
DEVMETHOD(bhnd_bus_get_probe_order, bhnd_generic_get_probe_order),
DEVMETHOD(bhnd_bus_is_region_valid, bhnd_generic_is_region_valid),
DEVMETHOD(bhnd_bus_is_hostb_device, bhnd_bus_generic_is_hostb_device),
DEVMETHOD(bhnd_bus_is_hw_disabled, bhnd_bus_generic_is_hw_disabled),
DEVMETHOD(bhnd_bus_read_nvram_var, bhnd_generic_read_nvram_var),
DEVMETHOD(bhnd_bus_read_1, bhnd_read_1),
DEVMETHOD(bhnd_bus_read_2, bhnd_read_2),
DEVMETHOD(bhnd_bus_read_4, bhnd_read_4),
DEVMETHOD(bhnd_bus_write_1, bhnd_write_1),
DEVMETHOD(bhnd_bus_write_2, bhnd_write_2),
DEVMETHOD(bhnd_bus_write_4, bhnd_write_4),
DEVMETHOD(bhnd_bus_barrier, bhnd_barrier),
DEVMETHOD_END
};
devclass_t bhnd_devclass; /**< bhnd bus. */
devclass_t bhnd_hostb_devclass; /**< bhnd bus host bridge. */
devclass_t bhnd_nvram_devclass; /**< bhnd NVRAM device */
DEFINE_CLASS_0(bhnd, bhnd_driver, bhnd_methods, sizeof(struct bhnd_softc));
MODULE_VERSION(bhnd, 1);