1 // SPDX-License-Identifier: GPL-2.0
2 /*
3  * SMC 37C93X initialization code
4  */
5 
6 #include <linux/kernel.h>
7 
8 #include <linux/mm.h>
9 #include <linux/init.h>
10 #include <linux/delay.h>
11 
12 #include <asm/hwrpb.h>
13 #include <asm/io.h>
14 
15 #define SMC_DEBUG 0
16 
17 #if SMC_DEBUG
18 # define DBG_DEVS(args)         printk args
19 #else
20 # define DBG_DEVS(args)
21 #endif
22 
23 #define KB              1024
24 #define MB              (1024*KB)
25 #define GB              (1024*MB)
26 
27 /* device "activate" register contents */
28 #define DEVICE_ON		1
29 #define DEVICE_OFF		0
30 
31 /* configuration on/off keys */
32 #define CONFIG_ON_KEY		0x55
33 #define CONFIG_OFF_KEY		0xaa
34 
35 /* configuration space device definitions */
36 #define FDC			0
37 #define IDE1			1
38 #define IDE2			2
39 #define PARP			3
40 #define SER1			4
41 #define SER2			5
42 #define RTCL			6
43 #define KYBD			7
44 #define AUXIO			8
45 
46 /* Chip register offsets from base */
47 #define CONFIG_CONTROL		0x02
48 #define INDEX_ADDRESS		0x03
49 #define LOGICAL_DEVICE_NUMBER	0x07
50 #define DEVICE_ID		0x20
51 #define DEVICE_REV		0x21
52 #define POWER_CONTROL		0x22
53 #define POWER_MGMT		0x23
54 #define OSC			0x24
55 
56 #define ACTIVATE		0x30
57 #define ADDR_HI			0x60
58 #define ADDR_LO			0x61
59 #define INTERRUPT_SEL		0x70
60 #define INTERRUPT_SEL_2		0x72 /* KYBD/MOUS only */
61 #define DMA_CHANNEL_SEL		0x74 /* FDC/PARP only */
62 
63 #define FDD_MODE_REGISTER	0x90
64 #define FDD_OPTION_REGISTER	0x91
65 
66 /* values that we read back that are expected ... */
67 #define VALID_DEVICE_ID		2
68 
69 /* default device addresses */
70 #define KYBD_INTERRUPT		1
71 #define MOUS_INTERRUPT		12
72 #define COM2_BASE		0x2f8
73 #define COM2_INTERRUPT		3
74 #define COM1_BASE		0x3f8
75 #define COM1_INTERRUPT		4
76 #define PARP_BASE		0x3bc
77 #define PARP_INTERRUPT		7
78 
SMCConfigState(unsigned long baseAddr)79 static unsigned long __init SMCConfigState(unsigned long baseAddr)
80 {
81 	unsigned char devId;
82 
83 	unsigned long configPort;
84 	unsigned long indexPort;
85 	unsigned long dataPort;
86 
87 	int i;
88 
89 	configPort = indexPort = baseAddr;
90 	dataPort = configPort + 1;
91 
92 #define NUM_RETRIES 5
93 
94 	for (i = 0; i < NUM_RETRIES; i++)
95 	{
96 		outb(CONFIG_ON_KEY, configPort);
97 		outb(CONFIG_ON_KEY, configPort);
98 		outb(DEVICE_ID, indexPort);
99 		devId = inb(dataPort);
100 		if (devId == VALID_DEVICE_ID) {
101 			outb(DEVICE_REV, indexPort);
102 			/* unsigned char devRev = */ inb(dataPort);
103 			break;
104 		}
105 		else
106 			udelay(100);
107 	}
108 	return (i != NUM_RETRIES) ? baseAddr : 0L;
109 }
110 
SMCRunState(unsigned long baseAddr)111 static void __init SMCRunState(unsigned long baseAddr)
112 {
113 	outb(CONFIG_OFF_KEY, baseAddr);
114 }
115 
SMCDetectUltraIO(void)116 static unsigned long __init SMCDetectUltraIO(void)
117 {
118 	unsigned long baseAddr;
119 
120 	baseAddr = 0x3F0;
121 	if ( ( baseAddr = SMCConfigState( baseAddr ) ) == 0x3F0 ) {
122 		return( baseAddr );
123 	}
124 	baseAddr = 0x370;
125 	if ( ( baseAddr = SMCConfigState( baseAddr ) ) == 0x370 ) {
126 		return( baseAddr );
127 	}
128 	return( ( unsigned long )0 );
129 }
130 
SMCEnableDevice(unsigned long baseAddr,unsigned long device,unsigned long portaddr,unsigned long interrupt)131 static void __init SMCEnableDevice(unsigned long baseAddr,
132 			    unsigned long device,
133 			    unsigned long portaddr,
134 			    unsigned long interrupt)
135 {
136 	unsigned long indexPort;
137 	unsigned long dataPort;
138 
139 	indexPort = baseAddr;
140 	dataPort = baseAddr + 1;
141 
142 	outb(LOGICAL_DEVICE_NUMBER, indexPort);
143 	outb(device, dataPort);
144 
145 	outb(ADDR_LO, indexPort);
146 	outb(( portaddr & 0xFF ), dataPort);
147 
148 	outb(ADDR_HI, indexPort);
149 	outb((portaddr >> 8) & 0xFF, dataPort);
150 
151 	outb(INTERRUPT_SEL, indexPort);
152 	outb(interrupt, dataPort);
153 
154 	outb(ACTIVATE, indexPort);
155 	outb(DEVICE_ON, dataPort);
156 }
157 
SMCEnableKYBD(unsigned long baseAddr)158 static void __init SMCEnableKYBD(unsigned long baseAddr)
159 {
160 	unsigned long indexPort;
161 	unsigned long dataPort;
162 
163 	indexPort = baseAddr;
164 	dataPort = baseAddr + 1;
165 
166 	outb(LOGICAL_DEVICE_NUMBER, indexPort);
167 	outb(KYBD, dataPort);
168 
169 	outb(INTERRUPT_SEL, indexPort); /* Primary interrupt select */
170 	outb(KYBD_INTERRUPT, dataPort);
171 
172 	outb(INTERRUPT_SEL_2, indexPort); /* Secondary interrupt select */
173 	outb(MOUS_INTERRUPT, dataPort);
174 
175 	outb(ACTIVATE, indexPort);
176 	outb(DEVICE_ON, dataPort);
177 }
178 
SMCEnableFDC(unsigned long baseAddr)179 static void __init SMCEnableFDC(unsigned long baseAddr)
180 {
181 	unsigned long indexPort;
182 	unsigned long dataPort;
183 
184 	unsigned char oldValue;
185 
186 	indexPort = baseAddr;
187 	dataPort = baseAddr + 1;
188 
189 	outb(LOGICAL_DEVICE_NUMBER, indexPort);
190 	outb(FDC, dataPort);
191 
192 	outb(FDD_MODE_REGISTER, indexPort);
193 	oldValue = inb(dataPort);
194 
195 	oldValue |= 0x0E;                   /* Enable burst mode */
196 	outb(oldValue, dataPort);
197 
198 	outb(INTERRUPT_SEL, indexPort);	    /* Primary interrupt select */
199 	outb(0x06, dataPort );
200 
201 	outb(DMA_CHANNEL_SEL, indexPort);   /* DMA channel select */
202 	outb(0x02, dataPort);
203 
204 	outb(ACTIVATE, indexPort);
205 	outb(DEVICE_ON, dataPort);
206 }
207 
208 #if SMC_DEBUG
SMCReportDeviceStatus(unsigned long baseAddr)209 static void __init SMCReportDeviceStatus(unsigned long baseAddr)
210 {
211 	unsigned long indexPort;
212 	unsigned long dataPort;
213 	unsigned char currentControl;
214 
215 	indexPort = baseAddr;
216 	dataPort = baseAddr + 1;
217 
218 	outb(POWER_CONTROL, indexPort);
219 	currentControl = inb(dataPort);
220 
221 	printk(currentControl & (1 << FDC)
222 	       ? "\t+FDC Enabled\n" : "\t-FDC Disabled\n");
223 	printk(currentControl & (1 << IDE1)
224 	       ? "\t+IDE1 Enabled\n" : "\t-IDE1 Disabled\n");
225 	printk(currentControl & (1 << IDE2)
226 	       ? "\t+IDE2 Enabled\n" : "\t-IDE2 Disabled\n");
227 	printk(currentControl & (1 << PARP)
228 	       ? "\t+PARP Enabled\n" : "\t-PARP Disabled\n");
229 	printk(currentControl & (1 << SER1)
230 	       ? "\t+SER1 Enabled\n" : "\t-SER1 Disabled\n");
231 	printk(currentControl & (1 << SER2)
232 	       ? "\t+SER2 Enabled\n" : "\t-SER2 Disabled\n");
233 
234 	printk( "\n" );
235 }
236 #endif
237 
SMC93x_Init(void)238 int __init SMC93x_Init(void)
239 {
240 	unsigned long SMCUltraBase;
241 	unsigned long flags;
242 
243 	local_irq_save(flags);
244 	if ((SMCUltraBase = SMCDetectUltraIO()) != 0UL) {
245 #if SMC_DEBUG
246 		SMCReportDeviceStatus(SMCUltraBase);
247 #endif
248 		SMCEnableDevice(SMCUltraBase, SER1, COM1_BASE, COM1_INTERRUPT);
249 		DBG_DEVS(("SMC FDC37C93X: SER1 done\n"));
250 		SMCEnableDevice(SMCUltraBase, SER2, COM2_BASE, COM2_INTERRUPT);
251 		DBG_DEVS(("SMC FDC37C93X: SER2 done\n"));
252 		SMCEnableDevice(SMCUltraBase, PARP, PARP_BASE, PARP_INTERRUPT);
253 		DBG_DEVS(("SMC FDC37C93X: PARP done\n"));
254 		/* On PC164, IDE on the SMC is not enabled;
255 		   CMD646 (PCI) on MB */
256 		SMCEnableKYBD(SMCUltraBase);
257 		DBG_DEVS(("SMC FDC37C93X: KYB done\n"));
258 		SMCEnableFDC(SMCUltraBase);
259 		DBG_DEVS(("SMC FDC37C93X: FDC done\n"));
260 #if SMC_DEBUG
261 		SMCReportDeviceStatus(SMCUltraBase);
262 #endif
263 		SMCRunState(SMCUltraBase);
264 		local_irq_restore(flags);
265 		printk("SMC FDC37C93X Ultra I/O Controller found @ 0x%lx\n",
266 		       SMCUltraBase);
267 		return 1;
268 	}
269 	else {
270 		local_irq_restore(flags);
271 		DBG_DEVS(("No SMC FDC37C93X Ultra I/O Controller found\n"));
272 		return 0;
273 	}
274 }
275