xref: /freebsd/sys/dev/mmc/host/dwmmc_rockchip.c (revision 271171e0d97b88ba2a7c3bf750c9672b484c1c13)
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_subr.h>
43 
44 #include <dev/extres/clk/clk.h>
45 
46 #include <dev/mmc/host/dwmmc_var.h>
47 
48 #include "opt_mmccam.h"
49 
50 enum RKTYPE {
51 	RK2928 = 1,
52 	RK3288,
53 };
54 
55 static struct ofw_compat_data compat_data[] = {
56 	{"rockchip,rk2928-dw-mshc",	RK2928},
57 	{"rockchip,rk3288-dw-mshc",	RK3288},
58 	{NULL,				0},
59 };
60 
61 static int dwmmc_rockchip_update_ios(struct dwmmc_softc *sc, struct mmc_ios *ios);
62 
63 static int
64 rockchip_dwmmc_probe(device_t dev)
65 {
66 
67 	if (!ofw_bus_status_okay(dev))
68 		return (ENXIO);
69 
70 	if (ofw_bus_search_compatible(dev, compat_data)->ocd_data == 0)
71 		return (ENXIO);
72 
73 	device_set_desc(dev, "Synopsys DesignWare Mobile "
74 	    "Storage Host Controller (RockChip)");
75 
76 	return (BUS_PROBE_VENDOR);
77 }
78 
79 static int
80 rockchip_dwmmc_attach(device_t dev)
81 {
82 	struct dwmmc_softc *sc;
83 	int type;
84 
85 	sc = device_get_softc(dev);
86 	sc->hwtype = HWTYPE_ROCKCHIP;
87 	type = ofw_bus_search_compatible(dev, compat_data)->ocd_data;
88 
89 	switch (type) {
90 	case RK2928:
91 		sc->use_pio = 1;
92 		break;
93 	}
94 
95 	sc->update_ios = &dwmmc_rockchip_update_ios;
96 
97 	return (dwmmc_attach(dev));
98 }
99 
100 static int
101 dwmmc_rockchip_update_ios(struct dwmmc_softc *sc, struct mmc_ios *ios)
102 {
103 	unsigned int clock;
104 	int error;
105 
106 	if (ios->clock && ios->clock != sc->bus_hz) {
107 		sc->bus_hz = clock = ios->clock;
108 		/* Set the MMC clock. */
109 		if (sc->ciu) {
110 			/*
111 			 * Apparently you need to set the ciu clock to
112 			 * the double of bus_hz
113 			 */
114 			error = clk_set_freq(sc->ciu, clock * 2,
115 			    CLK_SET_ROUND_DOWN);
116 			if (error != 0) {
117 				device_printf(sc->dev,
118 				    "failed to set frequency to %u Hz: %d\n",
119 				    clock, error);
120 				return (error);
121 			}
122 		}
123 	}
124 	return (0);
125 }
126 
127 static device_method_t rockchip_dwmmc_methods[] = {
128 	/* bus interface */
129 	DEVMETHOD(device_probe, rockchip_dwmmc_probe),
130 	DEVMETHOD(device_attach, rockchip_dwmmc_attach),
131 	DEVMETHOD(device_detach, dwmmc_detach),
132 
133 	DEVMETHOD_END
134 };
135 
136 DEFINE_CLASS_1(rockchip_dwmmc, rockchip_dwmmc_driver, rockchip_dwmmc_methods,
137     sizeof(struct dwmmc_softc), dwmmc_driver);
138 
139 DRIVER_MODULE(rockchip_dwmmc, simplebus, rockchip_dwmmc_driver, 0, 0);
140 DRIVER_MODULE(rockchip_dwmmc, ofwbus, rockchip_dwmmc_driver, NULL, NULL);
141 #ifndef MMCCAM
142 MMC_DECLARE_BRIDGE(rockchip_dwmmc);
143 #endif
144