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/* $OpenBSD: imxsrc.c,v 1.1 2019/01/11 08:02:19 patrick 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/types.h>
#include <sys/systm.h>
#include <sys/device.h>
#include <sys/malloc.h>
#include <machine/cpufunc.h>
#include <machine/fdt.h>
#include <dev/ofw/openfirm.h>
#include <dev/ofw/ofw_clock.h>
#include <dev/ofw/fdt.h>
#define IMX8M_RESET_PCIEPHY 20
#define IMX8M_RESET_PCIEPHY_PERST 21
#define IMX8M_RESET_PCIE_CTRL_APPS_EN 22
#define IMX8M_RESET_PCIE_CTRL_APPS_TURNOFF 25
#define IMX8M_RESET_PCIE_CTRL_APPS_CLK_REQ 26
#define IMX8M_RESET_PCIE2PHY 33
#define IMX8M_RESET_PCIE2PHY_PERST 34
#define IMX8M_RESET_PCIE2_CTRL_APPS_EN 35
#define IMX8M_RESET_PCIE2_CTRL_APPS_CLK_REQ 36
#define IMX8M_RESET_PCIE2_CTRL_APPS_TURNOFF 37
#define SRC_PCIE1_RCR 0x2c
#define SRC_PCIE2_RCR 0x48
#define SRC_PCIE_RCR_PCIEPHY_G_RST (1 << 1)
#define SRC_PCIE_RCR_PCIEPHY_BTN (1 << 2)
#define SRC_PCIE_RCR_PCIEPHY_PERST (1 << 3)
#define SRC_PCIE_RCR_PCIE_CTRL_APPS_CLK_REQ (1 << 4)
#define SRC_PCIE_RCR_PCIE_CTRL_APPS_EN (1 << 6)
#define SRC_PCIE_RCR_PCIE_CTRL_APPS_TURNOFF (1 << 11)
struct imxsrc_reset {
uint32_t reg;
uint32_t bit;
};
struct imxsrc_reset imx8m_resets[] = {
[IMX8M_RESET_PCIEPHY] = { SRC_PCIE1_RCR, SRC_PCIE_RCR_PCIEPHY_G_RST | SRC_PCIE_RCR_PCIEPHY_BTN },
[IMX8M_RESET_PCIEPHY_PERST] = { SRC_PCIE1_RCR, SRC_PCIE_RCR_PCIEPHY_PERST },
[IMX8M_RESET_PCIE_CTRL_APPS_EN] = { SRC_PCIE1_RCR, SRC_PCIE_RCR_PCIE_CTRL_APPS_EN },
[IMX8M_RESET_PCIE_CTRL_APPS_TURNOFF] = { SRC_PCIE1_RCR, SRC_PCIE_RCR_PCIE_CTRL_APPS_TURNOFF },
[IMX8M_RESET_PCIE_CTRL_APPS_CLK_REQ] = { SRC_PCIE1_RCR, SRC_PCIE_RCR_PCIE_CTRL_APPS_CLK_REQ },
[IMX8M_RESET_PCIE2PHY] = { SRC_PCIE2_RCR, SRC_PCIE_RCR_PCIEPHY_G_RST | SRC_PCIE_RCR_PCIEPHY_BTN },
[IMX8M_RESET_PCIE2PHY_PERST] = { SRC_PCIE2_RCR, SRC_PCIE_RCR_PCIEPHY_PERST },
[IMX8M_RESET_PCIE2_CTRL_APPS_EN] = { SRC_PCIE2_RCR, SRC_PCIE_RCR_PCIE_CTRL_APPS_EN },
[IMX8M_RESET_PCIE2_CTRL_APPS_CLK_REQ] = { SRC_PCIE2_RCR, SRC_PCIE_RCR_PCIE_CTRL_APPS_CLK_REQ },
[IMX8M_RESET_PCIE2_CTRL_APPS_TURNOFF] = { SRC_PCIE2_RCR, SRC_PCIE_RCR_PCIE_CTRL_APPS_TURNOFF },
};
#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 imxsrc_softc {
struct device sc_dev;
bus_space_tag_t sc_iot;
bus_space_handle_t sc_ioh;
struct reset_device sc_rd;
struct imxsrc_reset *sc_resets;
int sc_nresets;
};
int imxsrc_match(struct device *, void *, void *);
void imxsrc_attach(struct device *, struct device *, void *);
void imxsrc_reset(void *, uint32_t *, int);
struct cfattach imxsrc_ca = {
sizeof (struct imxsrc_softc), imxsrc_match, imxsrc_attach
};
struct cfdriver imxsrc_cd = {
NULL, "imxsrc", DV_DULL
};
int
imxsrc_match(struct device *parent, void *match, void *aux)
{
struct fdt_attach_args *faa = aux;
return OF_is_compatible(faa->fa_node, "fsl,imx8mq-src");
}
void
imxsrc_attach(struct device *parent, struct device *self, void *aux)
{
struct imxsrc_softc *sc = (struct imxsrc_softc *)self;
struct fdt_attach_args *faa = aux;
KASSERT(faa->fa_nreg >= 1);
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))
panic("%s: bus_space_map failed!", __func__);
sc->sc_resets = imx8m_resets;
sc->sc_nresets = nitems(imx8m_resets);
sc->sc_rd.rd_node = faa->fa_node;
sc->sc_rd.rd_cookie = sc;
sc->sc_rd.rd_reset = imxsrc_reset;
reset_register(&sc->sc_rd);
printf("\n");
}
void
imxsrc_reset(void *cookie, uint32_t *cells, int assert)
{
struct imxsrc_softc *sc = cookie;
int idx = cells[0];
uint32_t reg;
if (idx >= sc->sc_nresets || sc->sc_resets[idx].bit == 0) {
printf("%s: 0x%08x\n", __func__, idx);
return;
}
switch (idx) {
case IMX8M_RESET_PCIEPHY:
case IMX8M_RESET_PCIE2PHY:
if (!assert)
delay(10);
break;
case IMX8M_RESET_PCIE_CTRL_APPS_EN:
case IMX8M_RESET_PCIE2_CTRL_APPS_EN:
assert = !assert;
break;
}
reg = HREAD4(sc, sc->sc_resets[idx].reg);
if (assert)
reg |= sc->sc_resets[idx].bit;
else
reg &= ~sc->sc_resets[idx].bit;
HWRITE4(sc, sc->sc_resets[idx].reg, reg);
}
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