/* $NetBSD: dwcmmc_fdt.c,v 1.24 2024/08/19 07:35:16 skrll Exp $ */

/*-
* Copyright (c) 2015-2018 Jared McNeill <[email protected]>
* 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 THE AUTHOR ``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 THE AUTHOR 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>
__KERNEL_RCSID(0, "$NetBSD: dwcmmc_fdt.c,v 1.24 2024/08/19 07:35:16 skrll Exp $");

#include <sys/param.h>
#include <sys/bus.h>
#include <sys/device.h>
#include <sys/intr.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/mutex.h>
#include <sys/condvar.h>
#include <sys/gpio.h>

#include <dev/ic/dwc_mmc_var.h>
#include <dev/sdmmc/sdmmcchip.h>
#include <dev/fdt/fdtvar.h>

static int      dwcmmc_fdt_match(device_t, cfdata_t, void *);
static void     dwcmmc_fdt_attach(device_t, device_t, void *);

static void     dwcmmc_fdt_pre_power_on(struct dwc_mmc_softc *);
static void     dwcmmc_fdt_post_power_on(struct dwc_mmc_softc *);

static int      dwcmmc_fdt_card_detect(struct dwc_mmc_softc *);
static int      dwcmmc_fdt_bus_clock(struct dwc_mmc_softc *, int);
static int      dwcmmc_fdt_signal_voltage(struct dwc_mmc_softc *, int);

struct dwcmmc_fdt_config {
       u_int           ciu_div;
       u_int           flags;
       uint32_t        intr_cardmask;
};

static const struct dwcmmc_fdt_config dwcmmc_rk3288_config = {
       .ciu_div = 2,
       .flags = DWC_MMC_F_USE_HOLD_REG |
                DWC_MMC_F_DMA,
       .intr_cardmask = __BIT(24),
};

static const struct dwcmmc_fdt_config dwmmc_default_config = {
       .flags = DWC_MMC_F_USE_HOLD_REG |
                DWC_MMC_F_DMA,
};

static const struct device_compatible_entry compat_data[] = {
       { .compat = "rockchip,rk3288-dw-mshc",  .data = &dwcmmc_rk3288_config },
       { .compat = "snps,dw-mshc",             .data = &dwmmc_default_config },
       { .compat = "starfive,jh7110-mmc",      .data = &dwmmc_default_config },
       DEVICE_COMPAT_EOL
};

struct dwcmmc_fdt_softc {
       struct dwc_mmc_softc    sc;
       struct clk              *sc_clk_biu;
       struct clk              *sc_clk_ciu;
       struct fdtbus_gpio_pin  *sc_pin_cd;
       const struct dwcmmc_fdt_config *sc_conf;
       u_int                   sc_ciu_div;
       struct fdtbus_regulator *sc_vqmmc;
       struct fdtbus_mmc_pwrseq *sc_pwrseq;
};

CFATTACH_DECL_NEW(dwcmmc_fdt, sizeof(struct dwcmmc_fdt_softc),
       dwcmmc_fdt_match, dwcmmc_fdt_attach, NULL, NULL);

static int
dwcmmc_fdt_match(device_t parent, cfdata_t cf, void *aux)
{
       struct fdt_attach_args * const faa = aux;

       return of_compatible_match(faa->faa_phandle, compat_data);
}

static void
dwcmmc_fdt_attach(device_t parent, device_t self, void *aux)
{
       struct dwcmmc_fdt_softc *esc = device_private(self);
       struct dwc_mmc_softc *sc = &esc->sc;
       struct fdt_attach_args * const faa = aux;
       const int phandle = faa->faa_phandle;
       char intrstr[128];
       u_int fifo_depth;
       bus_addr_t addr;
       bus_size_t size;
       int error;

       if (fdtbus_get_reg(phandle, 0, &addr, &size) != 0) {
               aprint_error(": couldn't get registers\n");
               return;
       }

       if (of_getprop_uint32(phandle, "fifo-depth", &fifo_depth))
               fifo_depth = 0;

       fdtbus_clock_assign(phandle);

       esc->sc_clk_biu = fdtbus_clock_get(phandle, "biu");
       if (esc->sc_clk_biu == NULL) {
               aprint_error(": couldn't get clock biu\n");
               return;
       }
       esc->sc_clk_ciu = fdtbus_clock_get(phandle, "ciu");
       if (esc->sc_clk_ciu == NULL) {
               aprint_error(": couldn't get clock ciu\n");
               return;
       }

       error = clk_enable(esc->sc_clk_biu);
       if (error) {
               aprint_error(": couldn't enable clock biu: %d\n", error);
               return;
       }
       error = clk_enable(esc->sc_clk_ciu);
       if (error) {
               aprint_error(": couldn't enable clock ciu: %d\n", error);
               return;
       }

       esc->sc_vqmmc = fdtbus_regulator_acquire(phandle, "vqmmc-supply");
       esc->sc_pwrseq = fdtbus_mmc_pwrseq_get(phandle);

       sc->sc_dev = self;
       sc->sc_bst = faa->faa_bst;
       sc->sc_dmat = faa->faa_dmat;
       error = bus_space_map(sc->sc_bst, addr, size, 0, &sc->sc_bsh);
       if (error) {
               aprint_error(": couldn't map %#" PRIx64 ": %d\n",
                   (uint64_t)addr, error);
               return;
       }
       esc->sc_conf = of_compatible_lookup(phandle, compat_data)->data;

       if (of_getprop_uint32(phandle, "max-frequency", &sc->sc_clock_freq) != 0)
               sc->sc_clock_freq = UINT_MAX;
       if (of_getprop_uint32(phandle, "bus-width", &sc->sc_bus_width) != 0)
               sc->sc_bus_width = 4;

       sc->sc_fifo_depth = fifo_depth;
       sc->sc_intr_cardmask = esc->sc_conf->intr_cardmask;
       sc->sc_ciu_div = esc->sc_conf->ciu_div;
       sc->sc_flags = esc->sc_conf->flags;
       if (of_getprop_bool(phandle, "non-removable")) {
               sc->sc_flags |= DWC_MMC_F_NON_REMOVABLE;
       }
       if (of_getprop_bool(phandle, "broken-cd")) {
               sc->sc_flags |= DWC_MMC_F_BROKEN_CD;
       }
       sc->sc_pre_power_on = dwcmmc_fdt_pre_power_on;
       sc->sc_post_power_on = dwcmmc_fdt_post_power_on;
       sc->sc_bus_clock = dwcmmc_fdt_bus_clock;
       sc->sc_signal_voltage = dwcmmc_fdt_signal_voltage;

       esc->sc_pin_cd = fdtbus_gpio_acquire(phandle, "cd-gpios",
           GPIO_PIN_INPUT);
       if (esc->sc_pin_cd)
               sc->sc_card_detect = dwcmmc_fdt_card_detect;

       aprint_naive("\n");
       aprint_normal(": DesignWare SD/MMC\n");

       if (!fdtbus_intr_str(phandle, 0, intrstr, sizeof(intrstr))) {
               aprint_error_dev(self, "failed to decode interrupt\n");
               return;
       }

       if (dwc_mmc_init(sc) != 0)
               return;

       sc->sc_ih = fdtbus_intr_establish_xname(phandle, 0, IPL_BIO, 0,
           dwc_mmc_intr, sc, device_xname(self));
       if (sc->sc_ih == NULL) {
               aprint_error_dev(self, "couldn't establish interrupt on %s\n",
                   intrstr);
               return;
       }
       aprint_normal_dev(self, "interrupting on %s\n", intrstr);
}

static void
dwcmmc_fdt_pre_power_on(struct dwc_mmc_softc *sc)
{
       struct dwcmmc_fdt_softc *esc = device_private(sc->sc_dev);

       if (esc->sc_pwrseq != NULL)
               fdtbus_mmc_pwrseq_pre_power_on(esc->sc_pwrseq);
}

static void
dwcmmc_fdt_post_power_on(struct dwc_mmc_softc *sc)
{
       struct dwcmmc_fdt_softc *esc = device_private(sc->sc_dev);

       if (esc->sc_pwrseq != NULL)
               fdtbus_mmc_pwrseq_post_power_on(esc->sc_pwrseq);
}

static int
dwcmmc_fdt_card_detect(struct dwc_mmc_softc *sc)
{
       struct dwcmmc_fdt_softc *esc = device_private(sc->sc_dev);

       KASSERT(esc->sc_pin_cd != NULL);

       return fdtbus_gpio_read(esc->sc_pin_cd);
}

static int
dwcmmc_fdt_bus_clock(struct dwc_mmc_softc *sc, int rate)
{
       struct dwcmmc_fdt_softc *esc = device_private(sc->sc_dev);
       const u_int ciu_div = sc->sc_ciu_div > 0 ? sc->sc_ciu_div : 1;
       int error;

       error = clk_set_rate(esc->sc_clk_ciu, 1000 * rate * ciu_div);
       if (error != 0) {
               aprint_error_dev(sc->sc_dev, "failed to set rate to %u kHz: %d\n",
                   rate * ciu_div, error);
               return error;
       }

       sc->sc_clock_freq = clk_get_rate(esc->sc_clk_ciu);

       aprint_debug_dev(sc->sc_dev, "set clock rate to %u kHz (target %u kHz)\n",
           sc->sc_clock_freq / 1000, rate);

       return 0;
}

static int
dwcmmc_fdt_signal_voltage(struct dwc_mmc_softc *sc, int signal_voltage)
{
       struct dwcmmc_fdt_softc *esc = device_private(sc->sc_dev);
       u_int uvol;
       int error;

       if (esc->sc_vqmmc == NULL)
               return 0;

       switch (signal_voltage) {
       case SDMMC_SIGNAL_VOLTAGE_180:
               uvol = 1800000;
               break;
       case SDMMC_SIGNAL_VOLTAGE_330:
               uvol = 3300000;
               break;
       default:
               return EINVAL;
       }

       error = fdtbus_regulator_supports_voltage(esc->sc_vqmmc, uvol, uvol);
       if (error != 0)
               return 0;

       error = fdtbus_regulator_set_voltage(esc->sc_vqmmc, uvol, uvol);
       if (error != 0)
               return error;

       return fdtbus_regulator_enable(esc->sc_vqmmc);
}

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