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| Current File : //sys/arm/at91/at91_pmc.c |
/*-
* Copyright (c) 2006 M. Warner Losh. All rights reserved.
* Copyright (c) 2010 Greg Ansley. 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 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 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: release/9.1.0/sys/arm/at91/at91_pmc.c 236081 2012-05-26 09:05:45Z marius $");
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/malloc.h>
#include <sys/module.h>
#include <sys/time.h>
#include <sys/bus.h>
#include <sys/resource.h>
#include <sys/rman.h>
#include <sys/timetc.h>
#include <machine/bus.h>
#include <machine/cpu.h>
#include <machine/cpufunc.h>
#include <machine/resource.h>
#include <machine/frame.h>
#include <machine/intr.h>
#include <arm/at91/at91reg.h>
#include <arm/at91/at91var.h>
#include <arm/at91/at91_pmcreg.h>
#include <arm/at91/at91_pmcvar.h>
static struct at91_pmc_softc {
bus_space_tag_t sc_st;
bus_space_handle_t sc_sh;
struct resource *mem_res; /* Memory resource */
device_t dev;
unsigned int main_clock_hz;
uint32_t pllb_init;
} *pmc_softc;
MALLOC_DECLARE(M_PMC);
MALLOC_DEFINE(M_PMC, "at91_pmc_clocks", "AT91 PMC Clock descriptors");
static void at91_pmc_set_pllb_mode(struct at91_pmc_clock *, int);
static void at91_pmc_set_sys_mode(struct at91_pmc_clock *, int);
static void at91_pmc_set_periph_mode(struct at91_pmc_clock *, int);
static void at91_pmc_clock_alias(const char *name, const char *alias);
static struct at91_pmc_clock slck = {
.name = "slck", // 32,768 Hz slow clock
.hz = 32768,
.refcnt = 1,
.id = 0,
.primary = 1,
};
/*
* NOTE: Clocks for "ordinary peripheral" devices e.g. spi0, udp0, uhp0 etc.
* are now created automatically. Only "system" clocks need be defined here.
*/
static struct at91_pmc_clock main_ck = {
.name = "main", // Main clock
.refcnt = 0,
.id = 1,
.primary = 1,
.pmc_mask = PMC_IER_MOSCS,
};
static struct at91_pmc_clock plla = {
.name = "plla", // PLLA Clock, used for CPU clocking
.parent = &main_ck,
.refcnt = 1,
.id = 0,
.primary = 1,
.pll = 1,
.pmc_mask = PMC_IER_LOCKA,
};
static struct at91_pmc_clock pllb = {
.name = "pllb", // PLLB Clock, used for USB functions
.parent = &main_ck,
.refcnt = 0,
.id = 0,
.primary = 1,
.pll = 1,
.pmc_mask = PMC_IER_LOCKB,
.set_mode = &at91_pmc_set_pllb_mode,
};
static struct at91_pmc_clock udpck = {
.name = "udpck",
.parent = &pllb,
.pmc_mask = PMC_SCER_UDP,
.set_mode = at91_pmc_set_sys_mode
};
static struct at91_pmc_clock uhpck = {
.name = "uhpck",
.parent = &pllb,
.pmc_mask = PMC_SCER_UHP,
.set_mode = at91_pmc_set_sys_mode
};
static struct at91_pmc_clock mck = {
.name = "mck", // Master (Peripheral) Clock
.pmc_mask = PMC_IER_MCKRDY,
.refcnt = 0,
};
static struct at91_pmc_clock cpu = {
.name = "cpu", // CPU Clock
.parent = &plla,
.pmc_mask = PMC_SCER_PCK,
.refcnt = 0,
};
/* "+32" or the automatic peripheral clocks */
static struct at91_pmc_clock *clock_list[16+32] = {
&slck,
&main_ck,
&plla,
&pllb,
&udpck,
&uhpck,
&mck,
&cpu
};
#if !defined(AT91C_MAIN_CLOCK)
static const unsigned int at91_mainf_tbl[] = {
3000000, 3276800, 3686400, 3840000, 4000000,
4433619, 4915200, 5000000, 5242880, 6000000,
6144000, 6400000, 6553600, 7159090, 7372800,
7864320, 8000000, 9830400, 10000000, 11059200,
12000000, 12288000, 13560000, 14318180, 14745600,
16000000, 17344700, 18432000, 20000000
};
#define MAINF_TBL_LEN (sizeof(at91_mainf_tbl) / sizeof(*at91_mainf_tbl))
#endif
static inline uint32_t
RD4(struct at91_pmc_softc *sc, bus_size_t off)
{
return (bus_read_4(sc->mem_res, off));
}
static inline void
WR4(struct at91_pmc_softc *sc, bus_size_t off, uint32_t val)
{
bus_write_4(sc->mem_res, off, val);
}
void
at91_pmc_set_pllb_mode(struct at91_pmc_clock *clk, int on)
{
struct at91_pmc_softc *sc = pmc_softc;
uint32_t value;
if (on) {
on = PMC_IER_LOCKB;
value = sc->pllb_init;
} else
value = 0;
/* Workaround RM9200 Errata #26 */
if (at91_is_rm92() &&
((value ^ RD4(sc, CKGR_PLLBR)) & 0x03f0ff) != 0) {
WR4(sc, CKGR_PLLBR, value ^ 1);
while ((RD4(sc, PMC_SR) & PMC_IER_LOCKB) != on)
continue;
}
WR4(sc, CKGR_PLLBR, value);
while ((RD4(sc, PMC_SR) & PMC_IER_LOCKB) != on)
continue;
}
static void
at91_pmc_set_sys_mode(struct at91_pmc_clock *clk, int on)
{
struct at91_pmc_softc *sc = pmc_softc;
WR4(sc, on ? PMC_SCER : PMC_SCDR, clk->pmc_mask);
if (on)
while ((RD4(sc, PMC_SCSR) & clk->pmc_mask) != clk->pmc_mask)
continue;
else
while ((RD4(sc, PMC_SCSR) & clk->pmc_mask) == clk->pmc_mask)
continue;
}
static void
at91_pmc_set_periph_mode(struct at91_pmc_clock *clk, int on)
{
struct at91_pmc_softc *sc = pmc_softc;
WR4(sc, on ? PMC_PCER : PMC_PCDR, clk->pmc_mask);
if (on)
while ((RD4(sc, PMC_PCSR) & clk->pmc_mask) != clk->pmc_mask)
continue;
else
while ((RD4(sc, PMC_PCSR) & clk->pmc_mask) == clk->pmc_mask)
continue;
}
struct at91_pmc_clock *
at91_pmc_clock_add(const char *name, uint32_t irq,
struct at91_pmc_clock *parent)
{
struct at91_pmc_clock *clk;
int i, buflen;
clk = malloc(sizeof(*clk), M_PMC, M_NOWAIT | M_ZERO);
if (clk == NULL)
goto err;
buflen = strlen(name) + 1;
clk->name = malloc(buflen, M_PMC, M_NOWAIT);
if (clk->name == NULL)
goto err;
strlcpy(clk->name, name, buflen);
clk->pmc_mask = 1 << irq;
clk->set_mode = &at91_pmc_set_periph_mode;
if (parent == NULL)
clk->parent = &mck;
else
clk->parent = parent;
for (i = 0; i < sizeof(clock_list) / sizeof(clock_list[0]); i++) {
if (clock_list[i] == NULL) {
clock_list[i] = clk;
return (clk);
}
}
err:
if (clk != NULL) {
if (clk->name != NULL)
free(clk->name, M_PMC);
free(clk, M_PMC);
}
panic("could not allocate pmc clock '%s'", name);
return (NULL);
}
static void
at91_pmc_clock_alias(const char *name, const char *alias)
{
struct at91_pmc_clock *clk, *alias_clk;
clk = at91_pmc_clock_ref(name);
if (clk)
alias_clk = at91_pmc_clock_add(alias, 0, clk->parent);
if (clk && alias_clk) {
alias_clk->hz = clk->hz;
alias_clk->pmc_mask = clk->pmc_mask;
alias_clk->set_mode = clk->set_mode;
}
}
struct at91_pmc_clock *
at91_pmc_clock_ref(const char *name)
{
int i;
for (i = 0; i < sizeof(clock_list) / sizeof(clock_list[0]); i++) {
if (clock_list[i] == NULL)
break;
if (strcmp(name, clock_list[i]->name) == 0)
return (clock_list[i]);
}
//printf("at91_pmc: Warning - did not find clock '%s'", name);
return (NULL);
}
void
at91_pmc_clock_deref(struct at91_pmc_clock *clk)
{
}
void
at91_pmc_clock_enable(struct at91_pmc_clock *clk)
{
/* XXX LOCKING? XXX */
if (clk->parent)
at91_pmc_clock_enable(clk->parent);
if (clk->refcnt++ == 0 && clk->set_mode)
clk->set_mode(clk, 1);
}
void
at91_pmc_clock_disable(struct at91_pmc_clock *clk)
{
/* XXX LOCKING? XXX */
if (--clk->refcnt == 0 && clk->set_mode)
clk->set_mode(clk, 0);
if (clk->parent)
at91_pmc_clock_disable(clk->parent);
}
static int
at91_pmc_pll_rate(struct at91_pmc_clock *clk, uint32_t reg)
{
uint32_t mul, div, freq;
freq = clk->parent->hz;
div = (reg >> clk->pll_div_shift) & clk->pll_div_mask;
mul = (reg >> clk->pll_mul_shift) & clk->pll_mul_mask;
#if 0
printf("pll = (%d / %d) * %d = %d\n",
freq, div, mul + 1, (freq/div) * (mul+1));
#endif
if (div != 0 && mul != 0) {
freq /= div;
freq *= mul + 1;
} else
freq = 0;
clk->hz = freq;
return (freq);
}
static uint32_t
at91_pmc_pll_calc(struct at91_pmc_clock *clk, uint32_t out_freq)
{
uint32_t i, div = 0, mul = 0, diff = 1 << 30;
unsigned ret = 0x3e00;
if (out_freq > clk->pll_max_out)
goto fail;
for (i = 1; i < 256; i++) {
int32_t diff1;
uint32_t input, mul1;
input = clk->parent->hz / i;
if (input < clk->pll_min_in)
break;
if (input > clk->pll_max_in)
continue;
mul1 = out_freq / input;
if (mul1 > (clk->pll_mul_mask + 1))
continue;
if (mul1 == 0)
break;
diff1 = out_freq - input * mul1;
if (diff1 < 0)
diff1 = -diff1;
if (diff > diff1) {
diff = diff1;
div = i;
mul = mul1;
if (diff == 0)
break;
}
}
if (diff > (out_freq >> PMC_PLL_SHIFT_TOL))
goto fail;
if (clk->set_outb != NULL)
ret |= clk->set_outb(out_freq);
return (ret |
((mul - 1) << clk->pll_mul_shift) |
(div << clk->pll_div_shift));
fail:
return (0);
}
static void
at91_pmc_init_clock(struct at91_pmc_softc *sc, unsigned int main_clock)
{
uint32_t mckr;
uint32_t mdiv;
if (at91_is_sam9() || at91_is_sam9xe()) {
uhpck.pmc_mask = PMC_SCER_UHP_SAM9;
udpck.pmc_mask = PMC_SCER_UDP_SAM9;
}
mckr = RD4(sc, PMC_MCKR);
sc->main_clock_hz = main_clock;
main_ck.hz = main_clock;
at91_pmc_pll_rate(&plla, RD4(sc, CKGR_PLLAR));
if (at91_cpu_is(AT91_CPU_SAM9G45) && (mckr & PMC_MCKR_PLLADIV2))
plla.hz /= 2;
/*
* Initialize the usb clock. This sets up pllb, but disables the
* actual clock.
*/
sc->pllb_init = at91_pmc_pll_calc(&pllb, 48000000 * 2) | 0x10000000;
at91_pmc_pll_rate(&pllb, sc->pllb_init);
#if 0
/* Turn off USB clocks */
at91_pmc_set_periph_mode(&ohci_clk, 0);
at91_pmc_set_periph_mode(&udc_clk, 0);
#endif
if (at91_is_rm92()) {
WR4(sc, PMC_SCDR, PMC_SCER_UHP | PMC_SCER_UDP);
WR4(sc, PMC_SCER, PMC_SCER_MCKUDP);
} else
WR4(sc, PMC_SCDR, PMC_SCER_UHP_SAM9 | PMC_SCER_UDP_SAM9);
WR4(sc, CKGR_PLLBR, 0);
/*
* MCK and PCU derive from one of the primary clocks. Initialize
* this relationship.
*/
mck.parent = clock_list[mckr & 0x3];
mck.parent->refcnt++;
cpu.hz = mck.hz = mck.parent->hz /
(1 << ((mckr & PMC_MCKR_PRES_MASK) >> 2));
mdiv = (mckr & PMC_MCKR_MDIV_MASK) >> 8;
if (at91_is_sam9() || at91_is_sam9xe()) {
if (mdiv > 0)
mck.hz /= mdiv * 2;
} else
mck.hz /= (1 + mdiv);
/* Only found on SAM9G20 */
if (at91_cpu_is(AT91_CPU_SAM9G20))
cpu.hz /= (mckr & PMC_MCKR_PDIV) ? 2 : 1;
at91_master_clock = mck.hz;
device_printf(sc->dev,
"Primary: %d Hz PLLA: %d MHz CPU: %d MHz MCK: %d MHz\n",
sc->main_clock_hz,
plla.hz / 1000000,
cpu.hz / 1000000, mck.hz / 1000000);
/* Turn off "Progamable" clocks */
WR4(sc, PMC_SCDR, PMC_SCER_PCK0 | PMC_SCER_PCK1 | PMC_SCER_PCK2 |
PMC_SCER_PCK3);
/* XXX kludge, turn on all peripherals */
WR4(sc, PMC_PCER, 0xffffffff);
/* Disable all interrupts for PMC */
WR4(sc, PMC_IDR, 0xffffffff);
}
static void
at91_pmc_deactivate(device_t dev)
{
struct at91_pmc_softc *sc;
sc = device_get_softc(dev);
bus_generic_detach(sc->dev);
if (sc->mem_res)
bus_release_resource(dev, SYS_RES_IOPORT,
rman_get_rid(sc->mem_res), sc->mem_res);
sc->mem_res = 0;
}
static int
at91_pmc_activate(device_t dev)
{
struct at91_pmc_softc *sc;
int rid;
sc = device_get_softc(dev);
rid = 0;
sc->mem_res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &rid,
RF_ACTIVE);
if (sc->mem_res == NULL)
goto errout;
return (0);
errout:
at91_pmc_deactivate(dev);
return (ENOMEM);
}
static int
at91_pmc_probe(device_t dev)
{
device_set_desc(dev, "PMC");
return (0);
}
#if !defined(AT91C_MAIN_CLOCK)
static unsigned int
at91_pmc_sense_mainf(struct at91_pmc_softc *sc)
{
unsigned int ckgr_val;
unsigned int diff, matchdiff;
int i, match;
ckgr_val = (RD4(sc, CKGR_MCFR) & CKGR_MCFR_MAINF_MASK) << 11;
/*
* Try to find the standard frequency that match best.
*/
match = 0;
matchdiff = abs(ckgr_val - at91_mainf_tbl[0]);
for (i = 1; i < MAINF_TBL_LEN; i++) {
diff = abs(ckgr_val - at91_mainf_tbl[i]);
if (diff < matchdiff) {
match = i;
matchdiff = diff;
}
}
return (at91_mainf_tbl[match]);
}
#endif
static int
at91_pmc_attach(device_t dev)
{
unsigned int mainf;
int err;
pmc_softc = device_get_softc(dev);
pmc_softc->dev = dev;
if ((err = at91_pmc_activate(dev)) != 0)
return (err);
/*
* Configure main clock frequency.
*/
#if !defined(AT91C_MAIN_CLOCK)
mainf = at91_pmc_sense_mainf(pmc_softc);
#else
mainf = AT91C_MAIN_CLOCK;
#endif
at91_pmc_init_clock(pmc_softc, mainf);
/* These clocks refrenced by "special" names */
at91_pmc_clock_alias("ohci0", "ohci_clk");
at91_pmc_clock_alias("udp0", "udp_clk");
return (0);
}
static device_method_t at91_pmc_methods[] = {
DEVMETHOD(device_probe, at91_pmc_probe),
DEVMETHOD(device_attach, at91_pmc_attach),
DEVMETHOD_END
};
static driver_t at91_pmc_driver = {
"at91_pmc",
at91_pmc_methods,
sizeof(struct at91_pmc_softc),
};
static devclass_t at91_pmc_devclass;
DRIVER_MODULE(at91_pmc, atmelarm, at91_pmc_driver, at91_pmc_devclass, NULL,
NULL);