xref: /openbsd-src/sys/dev/pci/sdhc_pci.c (revision daf88648c0e349d5c02e1504293082072c981640)
1 /*	$OpenBSD: sdhc_pci.c,v 1.5 2006/07/19 20:58:45 fgsch Exp $	*/
2 
3 /*
4  * Copyright (c) 2006 Uwe Stuehler <uwe@openbsd.org>
5  *
6  * Permission to use, copy, modify, and distribute this software for any
7  * purpose with or without fee is hereby granted, provided that the above
8  * copyright notice and this permission notice appear in all copies.
9  *
10  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
11  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
12  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
13  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
14  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
15  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
16  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
17  */
18 
19 #include <sys/param.h>
20 #include <sys/device.h>
21 #include <sys/systm.h>
22 #include <sys/malloc.h>
23 
24 #include <dev/pci/pcivar.h>
25 #include <dev/pci/pcidevs.h>
26 #include <dev/sdmmc/sdhcreg.h>
27 #include <dev/sdmmc/sdhcvar.h>
28 #include <dev/sdmmc/sdmmcvar.h>
29 
30 /*
31  * 8-bit PCI configuration register that tells us how many slots there
32  * are and which BAR entry corresponds to the first slot.
33  */
34 #define SDHC_PCI_CONF_SLOT_INFO		0x40
35 #define SDHC_PCI_NUM_SLOTS(info)	((((info) >> 4) & 0x7) + 1)
36 #define SDHC_PCI_FIRST_BAR(info)	((info) & 0x7)
37 
38 /* TI specific register */
39 #define SDHC_PCI_GENERAL_CTL		0x4c
40 #define  MMC_SD_DIS			0x02
41 
42 struct sdhc_pci_softc {
43 	struct sdhc_softc sc;
44 	void *sc_ih;
45 };
46 
47 int	sdhc_pci_match(struct device *, void *, void *);
48 void	sdhc_pci_attach(struct device *, struct device *, void *);
49 void	sdhc_takecontroller(struct pci_attach_args *);
50 
51 struct cfattach sdhc_pci_ca = {
52 	sizeof(struct sdhc_pci_softc), sdhc_pci_match, sdhc_pci_attach
53 };
54 
55 int
56 sdhc_pci_match(struct device *parent, void *match, void *aux)
57 {
58 	struct pci_attach_args *pa = aux;
59 
60 	if (PCI_CLASS(pa->pa_class) == PCI_CLASS_SYSTEM &&
61 	    PCI_SUBCLASS(pa->pa_class) == PCI_SUBCLASS_SYSTEM_SDHC)
62 		return 1;
63 
64 	return 0;
65 }
66 
67 void
68 sdhc_pci_attach(struct device *parent, struct device *self, void *aux)
69 {
70 	struct sdhc_pci_softc *sc = (struct sdhc_pci_softc *)self;
71 	struct pci_attach_args *pa = aux;
72 	pci_intr_handle_t ih;
73 	char const *intrstr;
74 	int slotinfo;
75 	int nslots;
76 	int usedma;
77 	int reg;
78 	bus_space_tag_t iot;
79 	bus_space_handle_t ioh;
80 	bus_size_t size;
81 
82 	/* Some TI controllers needs special treatment. */
83 	if (PCI_VENDOR(pa->pa_id) == PCI_VENDOR_TI &&
84 	    PCI_PRODUCT(pa->pa_id) == PCI_PRODUCT_TI_PCI7XX1_SD &&
85             pa->pa_function == 4)
86 		sdhc_takecontroller(pa);
87 
88 	if (pci_intr_map(pa, &ih)) {
89 		printf(": can't map interrupt\n");
90 		return;
91 	}
92 
93 	intrstr = pci_intr_string(pa->pa_pc, ih);
94 	sc->sc_ih = pci_intr_establish(pa->pa_pc, ih, IPL_SDMMC,
95 	    sdhc_intr, sc, sc->sc.sc_dev.dv_xname);
96 	if (sc->sc_ih == NULL) {
97 		printf(": can't establish interrupt\n");
98 		return;
99 	}
100 	printf(": %s\n", intrstr);
101 
102 	/* Enable use of DMA if supported by the interface. */
103 	usedma = PCI_INTERFACE(pa->pa_class) == SDHC_PCI_INTERFACE_DMA;
104 
105 	/*
106 	 * Map and attach all hosts supported by the host controller.
107 	 */
108 	slotinfo = pci_conf_read(pa->pa_pc, pa->pa_tag,
109 	    SDHC_PCI_CONF_SLOT_INFO);
110 	nslots = SDHC_PCI_NUM_SLOTS(slotinfo);
111 
112 	/* Allocate an array big enough to hold all the possible hosts */
113 	MALLOC(sc->sc.sc_host, struct sdhc_host **,
114 	    sizeof(struct sdhc_host *) * nslots, M_DEVBUF, M_WAITOK);
115 
116 	/* XXX: handle 64-bit BARs */
117 	for (reg = SDHC_PCI_BAR_START + SDHC_PCI_FIRST_BAR(slotinfo) *
118 		 sizeof(u_int32_t);
119 	     reg < SDHC_PCI_BAR_END && nslots > 0;
120 	     reg += sizeof(u_int32_t), nslots--) {
121 
122 		if (pci_mem_find(pa->pa_pc, pa->pa_tag, reg,
123 		    NULL, NULL, NULL) != 0)
124 			continue;
125 
126 		if (pci_mapreg_map(pa, reg, PCI_MAPREG_TYPE_MEM, 0,
127 		    &iot, &ioh, NULL, &size, 0)) {
128 			printf("%s at 0x%x: can't map registers\n",
129 			    sc->sc.sc_dev.dv_xname, reg);
130 			continue;
131 		}
132 
133 		if (sdhc_host_found(&sc->sc, iot, ioh, size, usedma) != 0)
134 			/* XXX: sc->sc_host leak */
135 			printf("%s at 0x%x: can't initialize host\n",
136 			    sc->sc.sc_dev.dv_xname, reg);
137 	}
138 
139 	/*
140 	 * Establish power and shutdown hooks.
141 	 */
142 	(void)powerhook_establish(sdhc_power, &sc->sc);
143 	(void)shutdownhook_establish(sdhc_shutdown, &sc->sc);
144 }
145 
146 void
147 sdhc_takecontroller(struct pci_attach_args *pa)
148 {
149 	pcitag_t tag;
150 	pcireg_t id, reg;
151 
152 	/* Look at func 3 for the flash device */
153 	tag = pci_make_tag(pa->pa_pc, pa->pa_bus, pa->pa_device, 3);
154 	id = pci_conf_read(pa->pa_pc, tag, PCI_ID_REG);
155 	if (PCI_PRODUCT(id) != PCI_PRODUCT_TI_PCI7XX1_FLASH)
156 		return;
157 
158 	/*
159 	 * Disable MMC/SD on the flash media controller so the
160 	 * SD host takes over.
161 	 */
162 	reg = pci_conf_read(pa->pa_pc, tag, SDHC_PCI_GENERAL_CTL);
163 	reg |= MMC_SD_DIS;
164 	pci_conf_write(pa->pa_pc, tag, SDHC_PCI_GENERAL_CTL, reg);
165 }
166