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/* $OpenBSD: amlusbphy.c,v 1.3 2022/01/09 05:42:37 jsg Exp $ */
/*
* Copyright (c) 2019 Mark Kettenis <kettenis@openbsd.org>
*
* 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/intr.h>
#include <machine/bus.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/ofw_regulator.h>
#include <dev/ofw/fdt.h>
/* Registers */
#define PHY_R3 0x0c
#define PHY_R3_SQUELCH_REF_SHIFT 0
#define PHY_R3_HDISC_REF_SHIFT 2
#define PHY_R3_DISC_THRESH_SHIFT 4
#define PHY_R4 0x10
#define PHY_R4_CALIB_CODE_SHIFT 0
#define PHY_R4_TEST_BYPASS_MODE_EN (1 << 27)
#define PHY_R4_I_C2L_BIAS_TRIM_SHIFT 28
#define PHY_R13 0x34
#define PHY_R13_UPDATE_PMA_SIGNALS (1 << 15)
#define PHY_R13_MIN_COUNT_FOR_SYNC_DET_SHIFT 16
#define PHY_R14 0x38
#define PHY_R16 0x40
#define PHY_R16_MPLL_M_SHIFT 0
#define PHY_R16_MPLL_N_SHIFT 10
#define PHY_R16_MPLL_LOAD (1 << 22)
#define PHY_R16_MPLL_LOCK_LONG_SHIFT 24
#define PHY_R16_MPLL_FAST_LOCK (1 << 27)
#define PHY_R16_MPLL_EN (1 << 28)
#define PHY_R16_MPLL_RESET (1 << 29)
#define PHY_R17 0x44
#define PHY_R17_MPLL_FRAC_IN_SHIFT 0
#define PHY_R17_MPLL_LAMBDA1_SHIFT 17
#define PHY_R17_MPLL_LAMBDA0_SHIFT 20
#define PHY_R17_MPLL_FILTER_PVT2_SHIFT 24
#define PHY_R17_MPLL_FILTER_PVT1_SHIFT 28
#define PHY_R18 0x48
#define PHY_R18_MPLL_LKW_SEL_SHIFT 0
#define PHY_R18_MPLL_LK_W_SHIFT 2
#define PHY_R18_MPLL_LK_S_SHIFT 6
#define PHY_R18_MPLL_PFD_GAIN_SHIFT 14
#define PHY_R18_MPLL_ROU_SHIFT 16
#define PHY_R18_MPLL_DATA_SEL_SHIFT 19
#define PHY_R18_MPLL_BIAS_ADJ_SHIFT 22
#define PHY_R18_MPLL_BB_MODE_SHIFT 24
#define PHY_R18_MPLL_ALPHA_SHIFT 26
#define PHY_R18_MPLL_ADJ_LDO_SHIFT 29
#define PHY_R18_MPLL_ACG_RANGE (1U << 31)
#define PHY_R20 0x50
#define PHY_R20_USB2_ITG_VBUS_TRIM_SHIFT 1
#define PHY_R20_USB2_OTG_VBUSDET_EN (1 << 4)
#define PHY_R20_USB2_DMON_SEL_SHIFT 9
#define PHY_R20_USB2_EDGE_DRV_EN (1 << 13)
#define PHY_R20_USB2_EDGE_DRV_TRIM_SHIFT 14
#define PHY_R20_USB2_BGR_ADJ_SHIFT 16
#define PHY_R20_USB2_BGR_VREF_SHIFT 24
#define PHY_R20_USB2_BGR_DBG_SHIFT 29
#define PHY_R21 0x54
#define PHY_R21_USB2_OTG_ACA_EN (1 << 2)
#define HREAD4(sc, reg) \
(bus_space_read_4((sc)->sc_iot, (sc)->sc_ioh, (reg)))
#define HWRITE4(sc, reg, val) \
bus_space_write_4((sc)->sc_iot, (sc)->sc_ioh, (reg), (val))
#define HSET4(sc, reg, bits) \
HWRITE4((sc), (reg), HREAD4((sc), (reg)) | (bits))
#define HCLR4(sc, reg, bits) \
HWRITE4((sc), (reg), HREAD4((sc), (reg)) & ~(bits))
struct amlusbphy_softc {
struct device sc_dev;
bus_space_tag_t sc_iot;
bus_space_handle_t sc_ioh;
struct phy_device sc_pd;
};
int amlusbphy_match(struct device *, void *, void *);
void amlusbphy_attach(struct device *, struct device *, void *);
const struct cfattach amlusbphy_ca = {
sizeof (struct amlusbphy_softc), amlusbphy_match, amlusbphy_attach
};
struct cfdriver amlusbphy_cd = {
NULL, "amlusbphy", DV_DULL
};
int amlusbphy_enable(void *, uint32_t *);
uint16_t amlusbphy_read(struct amlusbphy_softc *, bus_addr_t);
void amlusbphy_write(struct amlusbphy_softc *, bus_addr_t, uint16_t);
int
amlusbphy_match(struct device *parent, void *match, void *aux)
{
struct fdt_attach_args *faa = aux;
return OF_is_compatible(faa->fa_node, "amlogic,g12a-usb2-phy");
}
void
amlusbphy_attach(struct device *parent, struct device *self, void *aux)
{
struct amlusbphy_softc *sc = (struct amlusbphy_softc *)self;
struct fdt_attach_args *faa = aux;
if (faa->fa_nreg < 1) {
printf(": no registers\n");
return;
}
sc->sc_iot = faa->fa_iot;
if (bus_space_map(sc->sc_iot, faa->fa_reg[0].addr,
faa->fa_reg[0].size, 0, &sc->sc_ioh)) {
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 = amlusbphy_enable;
phy_register(&sc->sc_pd);
}
int
amlusbphy_enable(void *cookie, uint32_t *cells)
{
struct amlusbphy_softc *sc = cookie;
int node = sc->sc_pd.pd_node;
uint32_t phy_supply;
clock_enable_all(node);
reset_assert_all(node);
delay(10);
reset_deassert_all(node);
delay(1000);
phy_supply = OF_getpropint(node, "phy-supply", 0);
if (phy_supply)
regulator_enable(phy_supply);
HCLR4(sc, PHY_R21, PHY_R21_USB2_OTG_ACA_EN);
/* Set PLL to 480 MHz. */
HWRITE4(sc, PHY_R16, (20 << PHY_R16_MPLL_M_SHIFT) |
(1 << PHY_R16_MPLL_N_SHIFT) | PHY_R16_MPLL_LOAD |
(1 << PHY_R16_MPLL_LOCK_LONG_SHIFT) | PHY_R16_MPLL_FAST_LOCK |
PHY_R16_MPLL_EN | PHY_R16_MPLL_RESET);
HWRITE4(sc, PHY_R17, (0 << PHY_R17_MPLL_FRAC_IN_SHIFT) |
(7 << PHY_R17_MPLL_LAMBDA0_SHIFT) |
(7 << PHY_R17_MPLL_LAMBDA1_SHIFT) |
(9 << PHY_R17_MPLL_FILTER_PVT1_SHIFT) |
(2 << PHY_R17_MPLL_FILTER_PVT2_SHIFT));
HWRITE4(sc, PHY_R18, (1 << PHY_R18_MPLL_LKW_SEL_SHIFT) |
(9 << PHY_R18_MPLL_LK_W_SHIFT) | (39 << PHY_R18_MPLL_LK_S_SHIFT) |
(1 << PHY_R18_MPLL_PFD_GAIN_SHIFT) |
(7 << PHY_R18_MPLL_ROU_SHIFT) |
(3 << PHY_R18_MPLL_DATA_SEL_SHIFT) |
(1 << PHY_R18_MPLL_BIAS_ADJ_SHIFT) |
(0 << PHY_R18_MPLL_BB_MODE_SHIFT) |
(3 << PHY_R18_MPLL_ALPHA_SHIFT) |
(1 << PHY_R18_MPLL_ADJ_LDO_SHIFT) |
PHY_R18_MPLL_ACG_RANGE);
delay(100);
HWRITE4(sc, PHY_R16, (20 << PHY_R16_MPLL_M_SHIFT) |
(1 << PHY_R16_MPLL_N_SHIFT) | PHY_R16_MPLL_LOAD |
(1 << PHY_R16_MPLL_LOCK_LONG_SHIFT) | PHY_R16_MPLL_FAST_LOCK |
PHY_R16_MPLL_EN);
/* Tune PHY. */
HWRITE4(sc, PHY_R20, (4 << PHY_R20_USB2_ITG_VBUS_TRIM_SHIFT) |
PHY_R20_USB2_OTG_VBUSDET_EN | (15 << PHY_R20_USB2_DMON_SEL_SHIFT) |
PHY_R20_USB2_EDGE_DRV_EN |
(3 << PHY_R20_USB2_EDGE_DRV_TRIM_SHIFT) |
(0 << PHY_R20_USB2_BGR_ADJ_SHIFT) |
(0 << PHY_R20_USB2_BGR_VREF_SHIFT) |
(0 << PHY_R20_USB2_BGR_DBG_SHIFT));
HWRITE4(sc, PHY_R4, (0xfff << PHY_R4_CALIB_CODE_SHIFT) |
PHY_R4_TEST_BYPASS_MODE_EN |
(0 << PHY_R4_I_C2L_BIAS_TRIM_SHIFT));
/* Tune disconnect threshold. */
HWRITE4(sc, PHY_R3, (0 << PHY_R3_SQUELCH_REF_SHIFT) |
(1 << PHY_R3_HDISC_REF_SHIFT) | (3 << PHY_R3_DISC_THRESH_SHIFT));
/* Analog settings. */
HWRITE4(sc, PHY_R14, 0);
HWRITE4(sc, PHY_R13, PHY_R13_UPDATE_PMA_SIGNALS |
(7 << PHY_R13_MIN_COUNT_FOR_SYNC_DET_SHIFT));
return 0;
}
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