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The PCI specifications don't explain the details on how to calculate

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the latency based on the Min_Gnt register so use the algorithm found
in OpenSolaris as they probably know how to interpret the value Sun
puts into these registers (previously, the latency calculated for
66MHz was most likely wrong) and for bridges additionally set up the
secondary latency register. Also set up the bridge control register
the way it's done in OpenSolaris. As the latency register don't apply
to PCI-Express and the bridge control setup wasn't tested on sun4v
(besides most likely not being needed), expand the #ifndef SUN4V
accordingly.

MFC after:	3 days
This commit is contained in:
Marius Strobl 2008-08-24 15:05:46 +00:00
parent 625451f9f4
commit c87ba3b18c
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=182108
1 changed files with 59 additions and 21 deletions
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80
sys/sparc64/pci/ofw_pcibus.c
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@ -61,7 +61,8 @@ __FBSDID("$FreeBSD$");
#include "pci_if.h"
/* Helper functions */
static void ofw_pcibus_setup_device(device_t, u_int, u_int, u_int);
static void ofw_pcibus_setup_device(device_t bridge, uint32_t clock,
u_int busno, u_int slot, u_int func);
/* Methods */
static device_probe_t ofw_pcibus_probe;
@ -118,8 +119,10 @@ ofw_pcibus_probe(device_t dev)
* Perform miscellaneous setups the firmware usually does not do for us.
*/
static void
ofw_pcibus_setup_device(device_t bridge, u_int busno, u_int slot, u_int func)
ofw_pcibus_setup_device(device_t bridge, uint32_t clock, u_int busno,
u_int slot, u_int func)
{
#ifndef SUN4V
uint32_t reg;
/*
@ -127,27 +130,59 @@ ofw_pcibus_setup_device(device_t bridge, u_int busno, u_int slot, u_int func)
* work properly. This is another task which the firmware doesn't
* always perform. The Min_Gnt register can be used to compute its
* recommended value: it contains the desired latency in units of
* 1/4 us. To calculate the correct latency timer value, the clock
* frequency of the bus (defaulting to 33MHz) and no wait states
* should be assumed.
* 1/4 us assuming a clock rate of 33MHz. To calculate the correct
* latency timer value, the clock frequency of the bus (defaulting
* to 33MHz) should be used and no wait states assumed.
* For bridges, we additionally set up the bridge control and the
* secondary latency registers.
*/
if (OF_getprop(ofw_bus_get_node(bridge), "clock-frequency", &reg,
sizeof(reg)) == -1)
reg = 33000000;
reg = PCIB_READ_CONFIG(bridge, busno, slot, func, PCIR_MINGNT, 1) *
reg / 1000000 / 4;
if (reg != 0) {
if ((PCIB_READ_CONFIG(bridge, busno, slot, func, PCIR_HDRTYPE, 1) &
PCIM_HDRTYPE) == PCIM_HDRTYPE_BRIDGE) {
reg = PCIB_READ_CONFIG(bridge, busno, slot, func,
PCIR_BRIDGECTL_1, 1);
reg |= PCIB_BCR_MASTER_ABORT_MODE | PCIB_BCR_SERR_ENABLE |
PCIB_BCR_PERR_ENABLE;
#ifdef OFW_PCI_DEBUG
device_printf(bridge, "device %d/%d/%d: latency timer %d -> "
"%d\n", busno, slot, func,
PCIB_READ_CONFIG(bridge, busno, slot, func,
PCIR_LATTIMER, 1), reg);
device_printf(bridge,
"bridge %d/%d/%d: control 0x%x -> 0x%x\n",
busno, slot, func, PCIB_READ_CONFIG(bridge, busno, slot,
func, PCIR_BRIDGECTL_1, 1), reg);
#endif /* OFW_PCI_DEBUG */
PCIB_WRITE_CONFIG(bridge, busno, slot, func,
PCIR_LATTIMER, min(reg, 255), 1);
}
PCIB_WRITE_CONFIG(bridge, busno, slot, func, PCIR_BRIDGECTL_1,
reg, 1);
reg = OFW_PCI_LATENCY;
#ifdef OFW_PCI_DEBUG
device_printf(bridge,
"bridge %d/%d/%d: latency timer %d -> %d\n",
busno, slot, func, PCIB_READ_CONFIG(bridge, busno, slot,
func, PCIR_SECLAT_1, 1), reg);
#endif /* OFW_PCI_DEBUG */
PCIB_WRITE_CONFIG(bridge, busno, slot, func, PCIR_SECLAT_1,
reg, 1);
} else {
reg = PCIB_READ_CONFIG(bridge, busno, slot, func,
PCIR_MINGNT, 1);
if (reg != 0) {
switch (clock) {
case 33000000:
reg *= 8;
break;
case 66000000:
reg *= 4;
break;
}
reg = min(reg, 255);
} else
reg = OFW_PCI_LATENCY;
}
#ifdef OFW_PCI_DEBUG
device_printf(bridge, "device %d/%d/%d: latency timer %d -> %d\n",
busno, slot, func, PCIB_READ_CONFIG(bridge, busno, slot, func,
PCIR_LATTIMER, 1), reg);
#endif /* OFW_PCI_DEBUG */
PCIB_WRITE_CONFIG(bridge, busno, slot, func, PCIR_LATTIMER, reg, 1);
#ifndef SUN4V
/*
* Compute a value to write into the cache line size register.
* The role of the streaming cache is unclear in write invalidate
@ -175,10 +210,10 @@ ofw_pcibus_attach(device_t dev)
struct ofw_pci_register pcir;
struct ofw_pcibus_devinfo *dinfo;
phandle_t node, child;
uint32_t clock;
u_int busno, domain, func, slot;
pcib = device_get_parent(dev);
domain = pcib_get_domain(dev);
busno = pcib_get_bus(dev);
if (bootverbose)
@ -198,6 +233,9 @@ ofw_pcibus_attach(device_t dev)
}
#endif
if (OF_getprop(ofw_bus_get_node(pcib), "clock-frequency", &clock,
sizeof(clock)) == -1)
clock = 33000000;
for (child = OF_child(node); child != 0; child = OF_peer(child)) {
if (OF_getprop(child, "reg", &pcir, sizeof(pcir)) == -1)
continue;
@ -206,7 +244,7 @@ ofw_pcibus_attach(device_t dev)
/* Some OFW device trees contain dupes. */
if (pci_find_dbsf(domain, busno, slot, func) != NULL)
continue;
ofw_pcibus_setup_device(pcib, busno, slot, func);
ofw_pcibus_setup_device(pcib, clock, busno, slot, func);
dinfo = (struct ofw_pcibus_devinfo *)pci_read_device(pcib,
domain, busno, slot, func, sizeof(*dinfo));
if (dinfo == NULL)