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/* $OpenBSD: rkemmcphy.c,v 1.2 2020/01/11 10:32:16 kettenis Exp $ */
/*
* Copyright (c) 2019 Patrick Wildt <patrick@blueri.se>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/device.h>
#include <machine/fdt.h>
#include <dev/ofw/openfirm.h>
#include <dev/ofw/ofw_clock.h>
#include <dev/ofw/ofw_misc.h>
#include <dev/ofw/fdt.h>
/* Registers */
#define GRF_EMMCPHY_CON0 0x00
#define GRF_EMMCPHY_CON0_OTAPDLYSEL_4 (0x4 << 7)
#define GRF_EMMCPHY_CON0_OTAPDLYENA_EN (1 << 11)
#define GRF_EMMCPHY_CON0_FREQSEL_200M (0x0 << 12)
#define GRF_EMMCPHY_CON0_FREQSEL_50M (0x1 << 12)
#define GRF_EMMCPHY_CON0_FREQSEL_100M (0x2 << 12)
#define GRF_EMMCPHY_CON0_FREQSEL_150M (0x3 << 12)
#define GRF_EMMCPHY_CON0_OTAPDLYSEL_CLR (0xf << 23)
#define GRF_EMMCPHY_CON0_OTAPDLYENA_CLR (1 << 27)
#define GRF_EMMCPHY_CON0_FREQSEL_CLR (0x3 << 28)
#define GRF_EMMCPHY_CON1 0x04
#define GRF_EMMCPHY_CON2 0x08
#define GRF_EMMCPHY_CON3 0x0c
#define GRF_EMMCPHY_CON4 0x10
#define GRF_EMMCPHY_CON5 0x14
#define GRF_EMMCPHY_CON6 0x18
#define GRF_EMMCPHY_CON6_PDB_OFF (0 << 0)
#define GRF_EMMCPHY_CON6_PDB_ON (1 << 0)
#define GRF_EMMCPHY_CON6_ENDLL_OFF (0 << 1)
#define GRF_EMMCPHY_CON6_ENDLL_ON (1 << 1)
#define GRF_EMMCPHY_CON6_DR_50OHM (0x0 << 4)
#define GRF_EMMCPHY_CON6_DR_33OHM (0x1 << 4)
#define GRF_EMMCPHY_CON6_DR_66OHM (0x2 << 4)
#define GRF_EMMCPHY_CON6_DR_100OHM (0x3 << 4)
#define GRF_EMMCPHY_CON6_DR_40OHM (0x4 << 4)
#define GRF_EMMCPHY_CON6_PDB_CLR (1 << 16)
#define GRF_EMMCPHY_CON6_ENDLL_CLR (1 << 17)
#define GRF_EMMCPHY_CON6_DR_CLR (0x7 << 20)
#define GRF_EMMCPHY_STATUS 0x20
#define GRF_EMMCPHY_STATUS_DLLRDY (1 << 5)
#define GRF_EMMCPHY_STATUS_CALDONE (1 << 6)
#define HREAD4(sc, reg) \
(regmap_read_4((sc)->sc_rm, (sc)->sc_off + (reg)))
#define HWRITE4(sc, reg, val) \
regmap_write_4((sc)->sc_rm, (sc)->sc_off + (reg), (val))
struct rkemmcphy_softc {
struct device sc_dev;
struct regmap *sc_rm;
bus_size_t sc_off;
struct phy_device sc_pd;
};
int rkemmcphy_match(struct device *, void *, void *);
void rkemmcphy_attach(struct device *, struct device *, void *);
struct cfattach rkemmcphy_ca = {
sizeof (struct rkemmcphy_softc), rkemmcphy_match, rkemmcphy_attach
};
struct cfdriver rkemmcphy_cd = {
NULL, "rkemmcphy", DV_DULL
};
int rkemmcphy_enable(void *, uint32_t *);
int
rkemmcphy_match(struct device *parent, void *match, void *aux)
{
struct fdt_attach_args *faa = aux;
return OF_is_compatible(faa->fa_node, "rockchip,rk3399-emmc-phy");
}
void
rkemmcphy_attach(struct device *parent, struct device *self, void *aux)
{
struct rkemmcphy_softc *sc = (struct rkemmcphy_softc *)self;
struct fdt_attach_args *faa = aux;
if (faa->fa_nreg < 1) {
printf(": no registers\n");
return;
}
sc->sc_off = faa->fa_reg[0].addr;
sc->sc_rm = regmap_bynode(OF_parent(faa->fa_node));
if (sc->sc_rm == NULL) {
printf(": can't map registers\n");
return;
}
printf("\n");
sc->sc_pd.pd_node = faa->fa_node;
sc->sc_pd.pd_cookie = sc;
sc->sc_pd.pd_enable = rkemmcphy_enable;
phy_register(&sc->sc_pd);
}
int
rkemmcphy_enable(void *cookie, uint32_t *cells)
{
struct rkemmcphy_softc *sc = cookie;
uint32_t impedance, freqsel, freq, reg;
int node = sc->sc_pd.pd_node;
int i;
impedance = OF_getpropint(node, "drive-impedance-ohm", 0);
freq = clock_get_frequency(node, "emmcclk");
switch (impedance) {
case 100:
impedance = GRF_EMMCPHY_CON6_DR_100OHM;
break;
case 66:
impedance = GRF_EMMCPHY_CON6_DR_66OHM;
break;
case 50:
impedance = GRF_EMMCPHY_CON6_DR_50OHM;
break;
case 40:
impedance = GRF_EMMCPHY_CON6_DR_40OHM;
break;
case 33:
impedance = GRF_EMMCPHY_CON6_DR_33OHM;
break;
default:
impedance = GRF_EMMCPHY_CON6_DR_50OHM;
break;
}
if (freq == 0) {
freqsel = GRF_EMMCPHY_CON0_FREQSEL_200M;
} else if (freq < 75000000) {
freqsel = GRF_EMMCPHY_CON0_FREQSEL_50M;
} else if (freq < 125000000) {
freqsel = GRF_EMMCPHY_CON0_FREQSEL_100M;
} else if (freq < 175000000) {
freqsel = GRF_EMMCPHY_CON0_FREQSEL_150M;
} else {
freqsel = GRF_EMMCPHY_CON0_FREQSEL_200M;
}
HWRITE4(sc, GRF_EMMCPHY_CON6, GRF_EMMCPHY_CON6_DR_CLR | impedance);
HWRITE4(sc, GRF_EMMCPHY_CON6,
GRF_EMMCPHY_CON6_PDB_CLR | GRF_EMMCPHY_CON6_PDB_OFF |
GRF_EMMCPHY_CON6_ENDLL_CLR | GRF_EMMCPHY_CON6_ENDLL_OFF);
delay(3);
HWRITE4(sc, GRF_EMMCPHY_CON6, GRF_EMMCPHY_CON6_PDB_CLR |
GRF_EMMCPHY_CON6_PDB_ON);
for (i = 5; i > 0; i--) {
reg = HREAD4(sc, GRF_EMMCPHY_STATUS);
if (reg & GRF_EMMCPHY_STATUS_CALDONE)
break;
delay(10);
}
if (i == 0)
printf("%s: timeout\n", sc->sc_dev.dv_xname);
HWRITE4(sc, GRF_EMMCPHY_CON0, GRF_EMMCPHY_CON0_FREQSEL_CLR | freqsel);
HWRITE4(sc, GRF_EMMCPHY_CON6, GRF_EMMCPHY_CON6_ENDLL_CLR |
GRF_EMMCPHY_CON6_ENDLL_ON);
if (freq != 0) {
for (i = 5; i > 0; i--) {
reg = HREAD4(sc, GRF_EMMCPHY_STATUS);
if (reg & GRF_EMMCPHY_STATUS_DLLRDY)
break;
delay(10 * 1000);
}
if (i == 0)
printf("%s: timeout\n", sc->sc_dev.dv_xname);
}
return 0;
}
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