xref: /freebsd/sys/dev/mmc/host/dwmmc_samsung.c (revision 031beb4e239bfce798af17f5fe8dba8bcaf13d99)
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 #include <sys/param.h>
29 #include <sys/kernel.h>
30 #include <sys/bus.h>
31 #include <sys/module.h>
32 #include <sys/queue.h>
33 #include <sys/taskqueue.h>
34 
35 #include <machine/bus.h>
36 
37 #include <dev/mmc/bridge.h>
38 #include <dev/mmc/mmc_fdt_helpers.h>
39 
40 #include <dev/ofw/ofw_bus.h>
41 #include <dev/ofw/ofw_bus_subr.h>
42 
43 #include <dev/mmc/host/dwmmc_var.h>
44 #include <dev/mmc/host/dwmmc_reg.h>
45 
46 #define	WRITE4(_sc, _reg, _val)		\
47 	bus_write_4((_sc)->res[0], _reg, _val)
48 
49 static struct ofw_compat_data compat_data[] = {
50 	{"samsung,exynos5420-dw-mshc",	1},
51 	{NULL,				0},
52 };
53 
54 static int
55 samsung_dwmmc_probe(device_t dev)
56 {
57 
58 	if (!ofw_bus_status_okay(dev))
59 		return (ENXIO);
60 
61 	if (ofw_bus_search_compatible(dev, compat_data)->ocd_data == 0)
62 		return (ENXIO);
63 
64 	device_set_desc(dev, "Synopsys DesignWare Mobile "
65 	    "Storage Host Controller (Samsung)");
66 
67 	return (BUS_PROBE_VENDOR);
68 }
69 
70 static int
71 samsung_dwmmc_attach(device_t dev)
72 {
73 	struct dwmmc_softc *sc;
74 	pcell_t dts_value[3];
75 	phandle_t node;
76 	int len;
77 
78 	sc = device_get_softc(dev);
79 	sc->hwtype = HWTYPE_EXYNOS;
80 
81 	if ((node = ofw_bus_get_node(sc->dev)) == -1)
82 		return (ENXIO);
83 
84 	if ((len = OF_getproplen(node, "samsung,dw-mshc-ciu-div")) <= 0)
85 		return (ENXIO);
86 	OF_getencprop(node, "samsung,dw-mshc-ciu-div", dts_value, len);
87 	sc->sdr_timing = (dts_value[0] << SDMMC_CLKSEL_DIVIDER_SHIFT);
88 	sc->ddr_timing = (dts_value[0] << SDMMC_CLKSEL_DIVIDER_SHIFT);
89 
90 	if ((len = OF_getproplen(node, "samsung,dw-mshc-sdr-timing")) <= 0)
91 		return (ENXIO);
92 	OF_getencprop(node, "samsung,dw-mshc-sdr-timing", dts_value, len);
93 	sc->sdr_timing |= ((dts_value[0] << SDMMC_CLKSEL_SAMPLE_SHIFT) |
94 			  (dts_value[1] << SDMMC_CLKSEL_DRIVE_SHIFT));
95 
96 	if ((len = OF_getproplen(node, "samsung,dw-mshc-ddr-timing")) <= 0)
97 		return (ENXIO);
98 	OF_getencprop(node, "samsung,dw-mshc-ddr-timing", dts_value, len);
99 	sc->ddr_timing |= ((dts_value[0] << SDMMC_CLKSEL_SAMPLE_SHIFT) |
100 			  (dts_value[1] << SDMMC_CLKSEL_DRIVE_SHIFT));
101 
102 	WRITE4(sc, EMMCP_MPSBEGIN0, 0);
103 	WRITE4(sc, EMMCP_SEND0, 0);
104 	WRITE4(sc, EMMCP_CTRL0, (MPSCTRL_SECURE_READ_BIT |
105 	    MPSCTRL_SECURE_WRITE_BIT |
106 	    MPSCTRL_NON_SECURE_READ_BIT |
107 	    MPSCTRL_NON_SECURE_WRITE_BIT |
108 	    MPSCTRL_VALID));
109 
110 	return (dwmmc_attach(dev));
111 }
112 
113 static device_method_t samsung_dwmmc_methods[] = {
114 	/* bus interface */
115 	DEVMETHOD(device_probe, samsung_dwmmc_probe),
116 	DEVMETHOD(device_attach, samsung_dwmmc_attach),
117 
118 	DEVMETHOD_END
119 };
120 
121 DEFINE_CLASS_1(samsung_dwmmc, samsung_dwmmc_driver, samsung_dwmmc_methods,
122     sizeof(struct dwmmc_softc), dwmmc_driver);
123 
124 DRIVER_MODULE(samsung_dwmmc, simplebus, samsung_dwmmc_driver, 0, 0);
125 DRIVER_MODULE(samsung_dwmmc, ofwbus, samsung_dwmmc_driver, NULL, NULL);
126 #ifndef MMCCAM
127 MMC_DECLARE_BRIDGE(samsung_dwmmc);
128 #endif
129