freebsd-dev/sys/mips/sibyte/sb_scd.c

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/*-
* Copyright (c) 2009 Neelkanth Natu
* 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.
* 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 <sys/param.h>
#include <sys/kernel.h>
#include <sys/systm.h>
#include <sys/module.h>
#include <sys/bus.h>
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#include <sys/cpuset.h>
#include <machine/resource.h>
#include <machine/hwfunc.h>
#include "sb_scd.h"
/*
* We compile a 32-bit kernel to run on the SB-1 processor which is a 64-bit
* processor. It has some registers that must be accessed using 64-bit load
* and store instructions.
*
* We use the mips_ld() and mips_sd() functions to do this for us.
*/
#define sb_store64(addr, val) mips3_sd((uint64_t *)(uintptr_t)(addr), (val))
#define sb_load64(addr) mips3_ld((uint64_t *)(uintptr_t)(addr))
/*
* System Control and Debug (SCD) unit on the Sibyte ZBbus.
*/
/*
* Extract the value starting at bit position 'b' for 'n' bits from 'x'.
*/
#define GET_VAL_64(x, b, n) (((x) >> (b)) & ((1ULL << (n)) - 1))
#define SYSREV_ADDR MIPS_PHYS_TO_KSEG1(0x10020000)
#define SYSREV_NUM_PROCESSORS(x) GET_VAL_64((x), 24, 4)
#define SYSCFG_ADDR MIPS_PHYS_TO_KSEG1(0x10020008)
#define SYSCFG_PLLDIV(x) GET_VAL_64((x), 7, 5)
#define ZBBUS_CYCLE_COUNT_ADDR MIPS_PHYS_TO_KSEG1(0x10030000)
#define INTSRC_MASK_ADDR(cpu) \
(MIPS_PHYS_TO_KSEG1(0x10020028) | ((cpu) << 13))
#define INTSRC_MAP_ADDR(cpu, intsrc) \
(MIPS_PHYS_TO_KSEG1(0x10020200) | ((cpu) << 13)) + (intsrc * 8)
#define MAILBOX_SET_ADDR(cpu) \
(MIPS_PHYS_TO_KSEG1(0x100200C8) | ((cpu) << 13))
#define MAILBOX_CLEAR_ADDR(cpu) \
(MIPS_PHYS_TO_KSEG1(0x100200D0) | ((cpu) << 13))
static uint64_t
sb_read_syscfg(void)
{
return (sb_load64(SYSCFG_ADDR));
}
static void
sb_write_syscfg(uint64_t val)
{
sb_store64(SYSCFG_ADDR, val);
}
uint64_t
sb_zbbus_cycle_count(void)
{
return (sb_load64(ZBBUS_CYCLE_COUNT_ADDR));
}
uint64_t
sb_cpu_speed(void)
{
int plldiv;
const uint64_t MHZ = 1000000;
plldiv = SYSCFG_PLLDIV(sb_read_syscfg());
if (plldiv == 0) {
printf("PLL_DIV is 0 - assuming 6 (300MHz).\n");
plldiv = 6;
}
return (plldiv * 50 * MHZ);
}
void
sb_system_reset(void)
{
uint64_t syscfg;
const uint64_t SYSTEM_RESET = 1ULL << 60;
const uint64_t EXT_RESET = 1ULL << 59;
const uint64_t SOFT_RESET = 1ULL << 58;
syscfg = sb_read_syscfg();
syscfg &= ~SOFT_RESET;
syscfg |= SYSTEM_RESET | EXT_RESET;
sb_write_syscfg(syscfg);
}
void
sb_disable_intsrc(int cpu, int src)
{
int regaddr;
uint64_t val;
regaddr = INTSRC_MASK_ADDR(cpu);
val = sb_load64(regaddr);
val |= 1ULL << src;
sb_store64(regaddr, val);
}
void
sb_enable_intsrc(int cpu, int src)
{
int regaddr;
uint64_t val;
regaddr = INTSRC_MASK_ADDR(cpu);
val = sb_load64(regaddr);
val &= ~(1ULL << src);
sb_store64(regaddr, val);
}
void
sb_write_intsrc_mask(int cpu, uint64_t val)
{
int regaddr;
regaddr = INTSRC_MASK_ADDR(cpu);
sb_store64(regaddr, val);
}
uint64_t
sb_read_intsrc_mask(int cpu)
{
int regaddr;
uint64_t val;
regaddr = INTSRC_MASK_ADDR(cpu);
val = sb_load64(regaddr);
return (val);
}
void
sb_write_intmap(int cpu, int intsrc, int intrnum)
{
int regaddr;
regaddr = INTSRC_MAP_ADDR(cpu, intsrc);
sb_store64(regaddr, intrnum);
}
int
sb_read_intmap(int cpu, int intsrc)
{
int regaddr;
regaddr = INTSRC_MAP_ADDR(cpu, intsrc);
return (sb_load64(regaddr) & 0x7);
}
int
sb_route_intsrc(int intsrc)
{
int intrnum;
KASSERT(intsrc >= 0 && intsrc < NUM_INTSRC,
("Invalid interrupt source number (%d)", intsrc));
/*
* Interrupt 5 is used by sources internal to the CPU (e.g. timer).
* Use a deterministic mapping for the remaining sources.
*/
#ifdef SMP
KASSERT(platform_ipi_intrnum() == 4,
("Unexpected interrupt number used for IPI"));
intrnum = intsrc % 4;
#else
intrnum = intsrc % 5;
#endif
return (intrnum);
}
#ifdef SMP
static uint64_t
sb_read_sysrev(void)
{
return (sb_load64(SYSREV_ADDR));
}
void
sb_set_mailbox(int cpu, uint64_t val)
{
int regaddr;
regaddr = MAILBOX_SET_ADDR(cpu);
sb_store64(regaddr, val);
}
void
sb_clear_mailbox(int cpu, uint64_t val)
{
int regaddr;
regaddr = MAILBOX_CLEAR_ADDR(cpu);
sb_store64(regaddr, val);
}
void
platform_cpu_mask(cpuset_t *mask)
{
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int i, s;
CPU_ZERO(mask);
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s = SYSREV_NUM_PROCESSORS(sb_read_sysrev());
for (i = 0; i < s; i++)
CPU_SET(i, mask);
}
#endif /* SMP */
#define SCD_PHYSADDR 0x10000000
#define SCD_SIZE 0x00060000
static int
scd_probe(device_t dev)
{
device_set_desc(dev, "Broadcom/Sibyte System Control and Debug");
return (0);
}
static int
scd_attach(device_t dev)
{
int rid;
struct resource *res;
if (bootverbose)
device_printf(dev, "attached.\n");
rid = 0;
res = bus_alloc_resource(dev, SYS_RES_MEMORY, &rid, SCD_PHYSADDR,
SCD_PHYSADDR + SCD_SIZE - 1, SCD_SIZE, 0);
if (res == NULL)
panic("Cannot allocate resource for system control and debug.");
return (0);
}
static device_method_t scd_methods[] ={
/* Device interface */
DEVMETHOD(device_probe, scd_probe),
DEVMETHOD(device_attach, scd_attach),
DEVMETHOD(device_detach, bus_generic_detach),
DEVMETHOD(device_shutdown, bus_generic_shutdown),
DEVMETHOD(device_suspend, bus_generic_suspend),
DEVMETHOD(device_resume, bus_generic_resume),
{ 0, 0 }
};
static driver_t scd_driver = {
"scd",
scd_methods
};
static devclass_t scd_devclass;
DRIVER_MODULE(scd, zbbus, scd_driver, scd_devclass, 0, 0);