1/*
2 * Copyright 2017 Emmanuel Vadot <manu@freebsd.org>
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions are
6 * met:
7 *
8 *  1. Redistributions of source code must retain the above copyright
9 *     notice, this list of conditions and the following disclaimer.
10 *  2. Redistributions in binary form must reproduce the above copyright
11 *     notice, this list of conditions and the following disclaimer in the
12 *     documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
17 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE
18 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
19 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
20 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
21 * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
22 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
23 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
24 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
25 */
26
27#include <sys/cdefs.h>
28__FBSDID("$FreeBSD$");
29
30#include <sys/param.h>
31#include <sys/kernel.h>
32#include <sys/bus.h>
33#include <sys/module.h>
34#include <sys/queue.h>
35#include <sys/taskqueue.h>
36
37#include <machine/bus.h>
38
39#include <dev/mmc/bridge.h>
40#include <dev/mmc/mmc_fdt_helpers.h>
41
42#include <dev/ofw/ofw_bus.h>
43#include <dev/ofw/ofw_bus_subr.h>
44
45#include <dev/mmc/host/dwmmc_var.h>
46#include <dev/mmc/host/dwmmc_reg.h>
47
48#define	WRITE4(_sc, _reg, _val)		\
49	bus_write_4((_sc)->res[0], _reg, _val)
50
51static struct ofw_compat_data compat_data[] = {
52	{"samsung,exynos5420-dw-mshc",	1},
53	{NULL,				0},
54};
55
56static int
57samsung_dwmmc_probe(device_t dev)
58{
59
60	if (!ofw_bus_status_okay(dev))
61		return (ENXIO);
62
63	if (ofw_bus_search_compatible(dev, compat_data)->ocd_data == 0)
64		return (ENXIO);
65
66	device_set_desc(dev, "Synopsys DesignWare Mobile "
67	    "Storage Host Controller (Samsung)");
68
69	return (BUS_PROBE_VENDOR);
70}
71
72static int
73samsung_dwmmc_attach(device_t dev)
74{
75	struct dwmmc_softc *sc;
76	pcell_t dts_value[3];
77	phandle_t node;
78	int len;
79
80	sc = device_get_softc(dev);
81	sc->hwtype = HWTYPE_EXYNOS;
82
83	if ((node = ofw_bus_get_node(sc->dev)) == -1)
84		return (ENXIO);
85
86	if ((len = OF_getproplen(node, "samsung,dw-mshc-ciu-div")) <= 0)
87		return (ENXIO);
88	OF_getencprop(node, "samsung,dw-mshc-ciu-div", dts_value, len);
89	sc->sdr_timing = (dts_value[0] << SDMMC_CLKSEL_DIVIDER_SHIFT);
90	sc->ddr_timing = (dts_value[0] << SDMMC_CLKSEL_DIVIDER_SHIFT);
91
92	if ((len = OF_getproplen(node, "samsung,dw-mshc-sdr-timing")) <= 0)
93		return (ENXIO);
94	OF_getencprop(node, "samsung,dw-mshc-sdr-timing", dts_value, len);
95	sc->sdr_timing |= ((dts_value[0] << SDMMC_CLKSEL_SAMPLE_SHIFT) |
96			  (dts_value[1] << SDMMC_CLKSEL_DRIVE_SHIFT));
97
98	if ((len = OF_getproplen(node, "samsung,dw-mshc-ddr-timing")) <= 0)
99		return (ENXIO);
100	OF_getencprop(node, "samsung,dw-mshc-ddr-timing", dts_value, len);
101	sc->ddr_timing |= ((dts_value[0] << SDMMC_CLKSEL_SAMPLE_SHIFT) |
102			  (dts_value[1] << SDMMC_CLKSEL_DRIVE_SHIFT));
103
104	WRITE4(sc, EMMCP_MPSBEGIN0, 0);
105	WRITE4(sc, EMMCP_SEND0, 0);
106	WRITE4(sc, EMMCP_CTRL0, (MPSCTRL_SECURE_READ_BIT |
107	    MPSCTRL_SECURE_WRITE_BIT |
108	    MPSCTRL_NON_SECURE_READ_BIT |
109	    MPSCTRL_NON_SECURE_WRITE_BIT |
110	    MPSCTRL_VALID));
111
112	return (dwmmc_attach(dev));
113}
114
115static device_method_t samsung_dwmmc_methods[] = {
116	/* bus interface */
117	DEVMETHOD(device_probe, samsung_dwmmc_probe),
118	DEVMETHOD(device_attach, samsung_dwmmc_attach),
119
120	DEVMETHOD_END
121};
122
123static devclass_t samsung_dwmmc_devclass;
124
125DEFINE_CLASS_1(samsung_dwmmc, samsung_dwmmc_driver, samsung_dwmmc_methods,
126    sizeof(struct dwmmc_softc), dwmmc_driver);
127
128DRIVER_MODULE(samsung_dwmmc, simplebus, samsung_dwmmc_driver,
129    samsung_dwmmc_devclass, 0, 0);
130DRIVER_MODULE(samsung_dwmmc, ofwbus, samsung_dwmmc_driver, samsung_dwmmc_devclass
131    , NULL, NULL);
132#ifndef MMCCAM
133MMC_DECLARE_BRIDGE(samsung_dwmmc);
134#endif
135