xref: /openbmc/linux/drivers/pcmcia/o2micro.h (revision f3539c12)
1 /*
2  * o2micro.h 1.13 1999/10/25 20:03:34
3  *
4  * The contents of this file are subject to the Mozilla Public License
5  * Version 1.1 (the "License"); you may not use this file except in
6  * compliance with the License. You may obtain a copy of the License
7  * at http://www.mozilla.org/MPL/
8  *
9  * Software distributed under the License is distributed on an "AS IS"
10  * basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
11  * the License for the specific language governing rights and
12  * limitations under the License.
13  *
14  * The initial developer of the original code is David A. Hinds
15  * <dahinds@users.sourceforge.net>.  Portions created by David A. Hinds
16  * are Copyright (C) 1999 David A. Hinds.  All Rights Reserved.
17  *
18  * Alternatively, the contents of this file may be used under the
19  * terms of the GNU General Public License version 2 (the "GPL"), in which
20  * case the provisions of the GPL are applicable instead of the
21  * above.  If you wish to allow the use of your version of this file
22  * only under the terms of the GPL and not to allow others to use
23  * your version of this file under the MPL, indicate your decision by
24  * deleting the provisions above and replace them with the notice and
25  * other provisions required by the GPL.  If you do not delete the
26  * provisions above, a recipient may use your version of this file
27  * under either the MPL or the GPL.
28  */
29 
30 #ifndef _LINUX_O2MICRO_H
31 #define _LINUX_O2MICRO_H
32 
33 /* Additional PCI configuration registers */
34 
35 #define O2_MUX_CONTROL		0x90	/* 32 bit */
36 #define  O2_MUX_RING_OUT	0x0000000f
37 #define  O2_MUX_SKTB_ACTV	0x000000f0
38 #define  O2_MUX_SCTA_ACTV_ENA	0x00000100
39 #define  O2_MUX_SCTB_ACTV_ENA	0x00000200
40 #define  O2_MUX_SER_IRQ_ROUTE	0x0000e000
41 #define  O2_MUX_SER_PCI		0x00010000
42 
43 #define  O2_MUX_SKTA_TURBO	0x000c0000	/* for 6833, 6860 */
44 #define  O2_MUX_SKTB_TURBO	0x00300000
45 #define  O2_MUX_AUX_VCC_3V	0x00400000
46 #define  O2_MUX_PCI_VCC_5V	0x00800000
47 #define  O2_MUX_PME_MUX		0x0f000000
48 
49 /* Additional ExCA registers */
50 
51 #define O2_MODE_A		0x38
52 #define O2_MODE_A_2		0x26	/* for 6833B, 6860C */
53 #define  O2_MODE_A_CD_PULSE	0x04
54 #define  O2_MODE_A_SUSP_EDGE	0x08
55 #define  O2_MODE_A_HOST_SUSP	0x10
56 #define  O2_MODE_A_PWR_MASK	0x60
57 #define  O2_MODE_A_QUIET	0x80
58 
59 #define O2_MODE_B		0x39
60 #define O2_MODE_B_2		0x2e	/* for 6833B, 6860C */
61 #define  O2_MODE_B_IDENT	0x03
62 #define  O2_MODE_B_ID_BSTEP	0x00
63 #define  O2_MODE_B_ID_CSTEP	0x01
64 #define  O2_MODE_B_ID_O2	0x02
65 #define  O2_MODE_B_VS1		0x04
66 #define  O2_MODE_B_VS2		0x08
67 #define  O2_MODE_B_IRQ15_RI	0x80
68 
69 #define O2_MODE_C		0x3a
70 #define  O2_MODE_C_DREQ_MASK	0x03
71 #define  O2_MODE_C_DREQ_INPACK	0x01
72 #define  O2_MODE_C_DREQ_WP	0x02
73 #define  O2_MODE_C_DREQ_BVD2	0x03
74 #define  O2_MODE_C_ZVIDEO	0x08
75 #define  O2_MODE_C_IREQ_SEL	0x30
76 #define  O2_MODE_C_MGMT_SEL	0xc0
77 
78 #define O2_MODE_D		0x3b
79 #define  O2_MODE_D_IRQ_MODE	0x03
80 #define  O2_MODE_D_PCI_CLKRUN	0x04
81 #define  O2_MODE_D_CB_CLKRUN	0x08
82 #define  O2_MODE_D_SKT_ACTV	0x20
83 #define  O2_MODE_D_PCI_FIFO	0x40	/* for OZ6729, OZ6730 */
84 #define  O2_MODE_D_W97_IRQ	0x40
85 #define  O2_MODE_D_ISA_IRQ	0x80
86 
87 #define O2_MHPG_DMA		0x3c
88 #define  O2_MHPG_CHANNEL	0x07
89 #define  O2_MHPG_CINT_ENA	0x08
90 #define  O2_MHPG_CSC_ENA	0x10
91 
92 #define O2_FIFO_ENA		0x3d
93 #define  O2_FIFO_ZVIDEO_3	0x08
94 #define  O2_FIFO_PCI_FIFO	0x10
95 #define  O2_FIFO_POSTWR		0x40
96 #define  O2_FIFO_BUFFER		0x80
97 
98 #define O2_MODE_E		0x3e
99 #define  O2_MODE_E_MHPG_DMA	0x01
100 #define  O2_MODE_E_SPKR_OUT	0x02
101 #define  O2_MODE_E_LED_OUT	0x08
102 #define  O2_MODE_E_SKTA_ACTV	0x10
103 
104 #define O2_RESERVED1		0x94
105 #define O2_RESERVED2		0xD4
106 #define O2_RES_READ_PREFETCH	0x02
107 #define O2_RES_WRITE_BURST	0x08
108 
109 static int o2micro_override(struct yenta_socket *socket)
110 {
111 	/*
112 	 * 'reserved' register at 0x94/D4. allows setting read prefetch and write
113 	 * bursting. read prefetching for example makes the RME Hammerfall DSP
114 	 * working. for some bridges it is at 0x94, for others at 0xD4. it's
115 	 * ok to write to both registers on all O2 bridges.
116 	 * from Eric Still, 02Micro.
117 	 */
118 	u8 a, b;
119 	bool use_speedup;
120 
121 	if (PCI_FUNC(socket->dev->devfn) == 0) {
122 		a = config_readb(socket, O2_RESERVED1);
123 		b = config_readb(socket, O2_RESERVED2);
124 		dev_dbg(&socket->dev->dev, "O2: 0x94/0xD4: %02x/%02x\n", a, b);
125 
126 		switch (socket->dev->device) {
127 		/*
128 		 * older bridges have problems with both read prefetch and write
129 		 * bursting depending on the combination of the chipset, bridge
130 		 * and the cardbus card. so disable them to be on the safe side.
131 		 */
132 		case PCI_DEVICE_ID_O2_6729:
133 		case PCI_DEVICE_ID_O2_6730:
134 		case PCI_DEVICE_ID_O2_6812:
135 		case PCI_DEVICE_ID_O2_6832:
136 		case PCI_DEVICE_ID_O2_6836:
137 		case PCI_DEVICE_ID_O2_6933:
138 			use_speedup = false;
139 			break;
140 		default:
141 			use_speedup = true;
142 			break;
143 		}
144 
145 		/* the user may override our decision */
146 		if (strcasecmp(o2_speedup, "on") == 0)
147 			use_speedup = true;
148 		else if (strcasecmp(o2_speedup, "off") == 0)
149 			use_speedup = false;
150 		else if (strcasecmp(o2_speedup, "default") != 0)
151 			dev_warn(&socket->dev->dev,
152 				"O2: Unknown parameter, using 'default'");
153 
154 		if (use_speedup) {
155 			dev_info(&socket->dev->dev,
156 				"O2: enabling read prefetch/write burst. If you experience problems or performance issues, use the yenta_socket parameter 'o2_speedup=off'\n");
157 			config_writeb(socket, O2_RESERVED1,
158 				      a | O2_RES_READ_PREFETCH | O2_RES_WRITE_BURST);
159 			config_writeb(socket, O2_RESERVED2,
160 				      b | O2_RES_READ_PREFETCH | O2_RES_WRITE_BURST);
161 		} else {
162 			dev_info(&socket->dev->dev,
163 				"O2: disabling read prefetch/write burst. If you experience problems or performance issues, use the yenta_socket parameter 'o2_speedup=on'\n");
164 			config_writeb(socket, O2_RESERVED1,
165 				      a & ~(O2_RES_READ_PREFETCH | O2_RES_WRITE_BURST));
166 			config_writeb(socket, O2_RESERVED2,
167 				      b & ~(O2_RES_READ_PREFETCH | O2_RES_WRITE_BURST));
168 		}
169 	}
170 
171 	return 0;
172 }
173 
174 static void o2micro_restore_state(struct yenta_socket *socket)
175 {
176 	/*
177 	 * as long as read prefetch is the only thing in
178 	 * o2micro_override, it's safe to call it from here
179 	 */
180 	o2micro_override(socket);
181 }
182 
183 #endif /* _LINUX_O2MICRO_H */
184