1 /* $OpenBSD: sdhc_pci.c,v 1.7 2007/10/30 18:13:45 chl 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
sdhc_pci_match(struct device * parent,void * match,void * aux)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
sdhc_pci_attach(struct device * parent,struct device * self,void * aux)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 /* ENE controllers break if set to 0V bus power */
89 if (PCI_VENDOR(pa->pa_id) == PCI_VENDOR_ENE &&
90 PCI_PRODUCT(pa->pa_id) == PCI_PRODUCT_ENE_SDCARD)
91 sc->sc.sc_flags |= SDHC_F_NOPWR0;
92
93 if (pci_intr_map(pa, &ih)) {
94 printf(": can't map interrupt\n");
95 return;
96 }
97
98 intrstr = pci_intr_string(pa->pa_pc, ih);
99 sc->sc_ih = pci_intr_establish(pa->pa_pc, ih, IPL_SDMMC,
100 sdhc_intr, sc, sc->sc.sc_dev.dv_xname);
101 if (sc->sc_ih == NULL) {
102 printf(": can't establish interrupt\n");
103 return;
104 }
105 printf(": %s\n", intrstr);
106
107 /* Enable use of DMA if supported by the interface. */
108 usedma = PCI_INTERFACE(pa->pa_class) == SDHC_PCI_INTERFACE_DMA;
109
110 /*
111 * Map and attach all hosts supported by the host controller.
112 */
113 slotinfo = pci_conf_read(pa->pa_pc, pa->pa_tag,
114 SDHC_PCI_CONF_SLOT_INFO);
115 nslots = SDHC_PCI_NUM_SLOTS(slotinfo);
116
117 /* Allocate an array big enough to hold all the possible hosts */
118 sc->sc.sc_host = malloc(sizeof(struct sdhc_host *) * nslots, M_DEVBUF,
119 M_WAITOK);
120
121 /* XXX: handle 64-bit BARs */
122 for (reg = SDHC_PCI_BAR_START + SDHC_PCI_FIRST_BAR(slotinfo) *
123 sizeof(u_int32_t);
124 reg < SDHC_PCI_BAR_END && nslots > 0;
125 reg += sizeof(u_int32_t), nslots--) {
126
127 if (pci_mem_find(pa->pa_pc, pa->pa_tag, reg,
128 NULL, NULL, NULL) != 0)
129 continue;
130
131 if (pci_mapreg_map(pa, reg, PCI_MAPREG_TYPE_MEM, 0,
132 &iot, &ioh, NULL, &size, 0)) {
133 printf("%s at 0x%x: can't map registers\n",
134 sc->sc.sc_dev.dv_xname, reg);
135 continue;
136 }
137
138 if (sdhc_host_found(&sc->sc, iot, ioh, size, usedma) != 0)
139 /* XXX: sc->sc_host leak */
140 printf("%s at 0x%x: can't initialize host\n",
141 sc->sc.sc_dev.dv_xname, reg);
142 }
143
144 /*
145 * Establish power and shutdown hooks.
146 */
147 (void)powerhook_establish(sdhc_power, &sc->sc);
148 (void)shutdownhook_establish(sdhc_shutdown, &sc->sc);
149 }
150
151 void
sdhc_takecontroller(struct pci_attach_args * pa)152 sdhc_takecontroller(struct pci_attach_args *pa)
153 {
154 pcitag_t tag;
155 pcireg_t id, reg;
156
157 /* Look at func 3 for the flash device */
158 tag = pci_make_tag(pa->pa_pc, pa->pa_bus, pa->pa_device, 3);
159 id = pci_conf_read(pa->pa_pc, tag, PCI_ID_REG);
160 if (PCI_PRODUCT(id) != PCI_PRODUCT_TI_PCI7XX1_FLASH)
161 return;
162
163 /*
164 * Disable MMC/SD on the flash media controller so the
165 * SD host takes over.
166 */
167 reg = pci_conf_read(pa->pa_pc, tag, SDHC_PCI_GENERAL_CTL);
168 reg |= MMC_SD_DIS;
169 pci_conf_write(pa->pa_pc, tag, SDHC_PCI_GENERAL_CTL, reg);
170 }
171