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sifive_prci: Add reset support for the FU540 and FU740

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This is needed for FU740 PCIe support. Whilst we don't need the FU540's
resets they are also defined for completeness.

Reviewed by:	manu
MFC after:	1 week
Differential Revision:	https://reviews.freebsd.org/D31024
This commit is contained in:
Jessica Clarke 2021-08-07 19:27:29 +01:00
parent dcbea9a2f4
commit 8e7e0690ec
2 changed files with 58 additions and 0 deletions
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1
sys/riscv/conf/GENERIC
View file

@ -82,6 +82,7 @@ device rcons
# EXT_RESOURCES pseudo devices
options EXT_RESOURCES
device clk
device hwreset
device syscon
device syscon_power
device riscv_syscon

57
sys/riscv/sifive/sifive_prci.c
View file

@ -54,6 +54,7 @@ __FBSDID("$FreeBSD$");
#include <dev/ofw/openfirm.h>
#include "clkdev_if.h"
#include "hwreset_if.h"
static struct resource_spec prci_spec[] = {
{ SYS_RES_MEMORY, 0, RF_ACTIVE },
@ -69,6 +70,8 @@ struct prci_softc {
struct resource *res;
bus_space_tag_t bst;
bus_space_handle_t bsh;
int nresets;
};
struct prci_clk_pll_sc {
@ -94,6 +97,9 @@ struct prci_clk_div_sc {
#define PRCI_PLL_DIVQ_MASK 0x38000
#define PRCI_PLL_DIVQ_SHIFT 15
/* Called devicesresetreg on the FU540 */
#define PRCI_DEVICES_RESET_N 0x28
#define PRCI_READ(_sc, _reg) \
bus_space_read_4((_sc)->bst, (_sc)->bsh, (_reg))
#define PRCI_WRITE(_sc, _reg, _val) \
@ -155,6 +161,7 @@ struct prci_config {
struct prci_div_def *div_clks;
struct prci_gate_def *gate_clks;
struct clk_fixed_def *tlclk_def;
int nresets;
};
/* FU540 clock numbers */
@ -191,6 +198,7 @@ static struct clk_fixed_def fu540_tlclk_def = {
struct prci_config fu540_prci_config = {
.pll_clks = fu540_pll_clks,
.tlclk_def = &fu540_tlclk_def,
.nresets = 6,
};
/* FU740 clock numbers */
@ -254,6 +262,7 @@ struct prci_config fu740_prci_config = {
.div_clks = fu740_div_clks,
.gate_clks = fu740_gate_clks,
.tlclk_def = &fu740_tlclk_def,
.nresets = 7,
};
static struct ofw_compat_data compat_data[] = {
@ -547,6 +556,8 @@ prci_attach(device_t dev)
if (error)
panic("Couldn't finalise clock domain");
sc->nresets = cfg->nresets;
return (0);
fail1:
@ -616,6 +627,48 @@ prci_device_unlock(device_t dev)
PRCI_UNLOCK(sc);
}
static int
prci_reset_assert(device_t dev, intptr_t id, bool reset)
{
struct prci_softc *sc;
uint32_t reg;
sc = device_get_softc(dev);
if (id >= sc->nresets)
return (ENXIO);
PRCI_LOCK(sc);
reg = PRCI_READ(sc, PRCI_DEVICES_RESET_N);
if (reset)
reg &= ~(1u << id);
else
reg |= (1u << id);
PRCI_WRITE(sc, PRCI_DEVICES_RESET_N, reg);
PRCI_UNLOCK(sc);
return (0);
}
static int
prci_reset_is_asserted(device_t dev, intptr_t id, bool *reset)
{
struct prci_softc *sc;
uint32_t reg;
sc = device_get_softc(dev);
if (id >= sc->nresets)
return (ENXIO);
PRCI_LOCK(sc);
reg = PRCI_READ(sc, PRCI_DEVICES_RESET_N);
*reset = (reg & (1u << id)) == 0;
PRCI_UNLOCK(sc);
return (0);
}
static device_method_t prci_methods[] = {
DEVMETHOD(device_probe, prci_probe),
DEVMETHOD(device_attach, prci_attach),
@ -627,6 +680,10 @@ static device_method_t prci_methods[] = {
DEVMETHOD(clkdev_device_lock, prci_device_lock),
DEVMETHOD(clkdev_device_unlock, prci_device_unlock),
/* Reset interface */
DEVMETHOD(hwreset_assert, prci_reset_assert),
DEVMETHOD(hwreset_is_asserted, prci_reset_is_asserted),
DEVMETHOD_END
};