1 /*
2  * PCIMT specific code
3  *
4  * This file is subject to the terms and conditions of the GNU General Public
5  * License.  See the file "COPYING" in the main directory of this archive
6  * for more details.
7  *
8  * Copyright (C) 1996, 97, 98, 2000, 03, 04, 06 Ralf Baechle (ralf@linux-mips.org)
9  * Copyright (C) 2006,2007 Thomas Bogendoerfer (tsbogend@alpha.franken.de)
10  */
11 
12 #include <linux/init.h>
13 #include <linux/interrupt.h>
14 #include <linux/irq.h>
15 #include <linux/pci.h>
16 #include <linux/serial_8250.h>
17 
18 #include <asm/sni.h>
19 #include <asm/time.h>
20 #include <asm/i8259.h>
21 #include <asm/irq_cpu.h>
22 
23 #define cacheconf (*(volatile unsigned int *)PCIMT_CACHECONF)
24 #define invspace (*(volatile unsigned int *)PCIMT_INVSPACE)
25 
sni_pcimt_sc_init(void)26 static void __init sni_pcimt_sc_init(void)
27 {
28 	unsigned int scsiz, sc_size;
29 
30 	scsiz = cacheconf & 7;
31 	if (scsiz == 0) {
32 		printk("Second level cache is deactivated.\n");
33 		return;
34 	}
35 	if (scsiz >= 6) {
36 		printk("Invalid second level cache size configured, "
37 		       "deactivating second level cache.\n");
38 		cacheconf = 0;
39 		return;
40 	}
41 
42 	sc_size = 128 << scsiz;
43 	printk("%dkb second level cache detected, deactivating.\n", sc_size);
44 	cacheconf = 0;
45 }
46 
47 
48 /*
49  * A bit more gossip about the iron we're running on ...
50  */
sni_pcimt_detect(void)51 static inline void sni_pcimt_detect(void)
52 {
53 	char boardtype[80];
54 	unsigned char csmsr;
55 	char *p = boardtype;
56 	unsigned int asic;
57 
58 	csmsr = *(volatile unsigned char *)PCIMT_CSMSR;
59 
60 	p += sprintf(p, "%s PCI", (csmsr & 0x80) ? "RM200" : "RM300");
61 	if ((csmsr & 0x80) == 0)
62 		p += sprintf(p, ", board revision %s",
63 			     (csmsr & 0x20) ? "D" : "C");
64 	asic = csmsr & 0x80;
65 	asic = (csmsr & 0x08) ? asic : !asic;
66 	p += sprintf(p, ", ASIC PCI Rev %s", asic ? "1.0" : "1.1");
67 	printk("%s.\n", boardtype);
68 }
69 
70 #define PORT(_base,_irq)				\
71 	{						\
72 		.iobase		= _base,		\
73 		.irq		= _irq,			\
74 		.uartclk	= 1843200,		\
75 		.iotype		= UPIO_PORT,		\
76 		.flags		= UPF_BOOT_AUTOCONF,	\
77 	}
78 
79 static struct plat_serial8250_port pcimt_data[] = {
80 	PORT(0x3f8, 4),
81 	PORT(0x2f8, 3),
82 	{ },
83 };
84 
85 static struct platform_device pcimt_serial8250_device = {
86 	.name			= "serial8250",
87 	.id			= PLAT8250_DEV_PLATFORM,
88 	.dev			= {
89 		.platform_data	= pcimt_data,
90 	},
91 };
92 
93 static struct resource pcimt_cmos_rsrc[] = {
94 	{
95 		.start = 0x70,
96 		.end   = 0x71,
97 		.flags = IORESOURCE_IO
98 	},
99 	{
100 		.start = 8,
101 		.end   = 8,
102 		.flags = IORESOURCE_IRQ
103 	}
104 };
105 
106 static struct platform_device pcimt_cmos_device = {
107 	.name		= "rtc_cmos",
108 	.num_resources	= ARRAY_SIZE(pcimt_cmos_rsrc),
109 	.resource	= pcimt_cmos_rsrc
110 };
111 
112 
113 static struct resource sni_io_resource = {
114 	.start	= 0x00000000UL,
115 	.end	= 0x03bfffffUL,
116 	.name	= "PCIMT IO MEM",
117 	.flags	= IORESOURCE_IO,
118 };
119 
120 static struct resource pcimt_io_resources[] = {
121 	{
122 		.start	= 0x00,
123 		.end	= 0x1f,
124 		.name	= "dma1",
125 		.flags	= IORESOURCE_BUSY
126 	}, {
127 		.start	=  0x40,
128 		.end	= 0x5f,
129 		.name	= "timer",
130 		.flags	= IORESOURCE_BUSY
131 	}, {
132 		.start	=  0x60,
133 		.end	= 0x6f,
134 		.name	= "keyboard",
135 		.flags	= IORESOURCE_BUSY
136 	}, {
137 		.start	=  0x80,
138 		.end	= 0x8f,
139 		.name	= "dma page reg",
140 		.flags	= IORESOURCE_BUSY
141 	}, {
142 		.start	=  0xc0,
143 		.end	= 0xdf,
144 		.name	= "dma2",
145 		.flags	= IORESOURCE_BUSY
146 	}, {
147 		.start	=  0xcfc,
148 		.end	= 0xcff,
149 		.name	= "PCI config data",
150 		.flags	= IORESOURCE_BUSY
151 	}
152 };
153 
154 static struct resource pcimt_mem_resources[] = {
155 	{
156 		/*
157 		 * this region should only be 4 bytes long,
158 		 * but it's 16MB on all RM300C I've checked
159 		 */
160 		.start	= 0x1a000000,
161 		.end	= 0x1affffff,
162 		.name	= "PCI INT ACK",
163 		.flags	= IORESOURCE_BUSY
164 	}
165 };
166 
167 static struct resource sni_mem_resource = {
168 	.start	= 0x18000000UL,
169 	.end	= 0x1fbfffffUL,
170 	.name	= "PCIMT PCI MEM",
171 	.flags	= IORESOURCE_MEM
172 };
173 
sni_pcimt_resource_init(void)174 static void __init sni_pcimt_resource_init(void)
175 {
176 	int i;
177 
178 	/* request I/O space for devices used on all i[345]86 PCs */
179 	for (i = 0; i < ARRAY_SIZE(pcimt_io_resources); i++)
180 		request_resource(&sni_io_resource, pcimt_io_resources + i);
181 	/* request MEM space for devices used on all i[345]86 PCs */
182 	for (i = 0; i < ARRAY_SIZE(pcimt_mem_resources); i++)
183 		request_resource(&sni_mem_resource, pcimt_mem_resources + i);
184 }
185 
186 extern struct pci_ops sni_pcimt_ops;
187 
188 #ifdef CONFIG_PCI
189 static struct pci_controller sni_controller = {
190 	.pci_ops	= &sni_pcimt_ops,
191 	.mem_resource	= &sni_mem_resource,
192 	.mem_offset	= 0x00000000UL,
193 	.io_resource	= &sni_io_resource,
194 	.io_offset	= 0x00000000UL,
195 	.io_map_base	= SNI_PORT_BASE
196 };
197 #endif
198 
enable_pcimt_irq(struct irq_data * d)199 static void enable_pcimt_irq(struct irq_data *d)
200 {
201 	unsigned int mask = 1 << (d->irq - PCIMT_IRQ_INT2);
202 
203 	*(volatile u8 *) PCIMT_IRQSEL |= mask;
204 }
205 
disable_pcimt_irq(struct irq_data * d)206 void disable_pcimt_irq(struct irq_data *d)
207 {
208 	unsigned int mask = ~(1 << (d->irq - PCIMT_IRQ_INT2));
209 
210 	*(volatile u8 *) PCIMT_IRQSEL &= mask;
211 }
212 
213 static struct irq_chip pcimt_irq_type = {
214 	.name = "PCIMT",
215 	.irq_mask = disable_pcimt_irq,
216 	.irq_unmask = enable_pcimt_irq,
217 };
218 
219 /*
220  * hwint0 should deal with MP agent, ASIC PCI, EISA NMI and debug
221  * button interrupts.  Later ...
222  */
pcimt_hwint0(void)223 static void pcimt_hwint0(void)
224 {
225 	panic("Received int0 but no handler yet ...");
226 }
227 
228 /*
229  * hwint 1 deals with EISA and SCSI interrupts,
230  *
231  * The EISA_INT bit in CSITPEND is high active, all others are low active.
232  */
pcimt_hwint1(void)233 static void pcimt_hwint1(void)
234 {
235 	u8 pend = *(volatile char *)PCIMT_CSITPEND;
236 	unsigned long flags;
237 
238 	if (pend & IT_EISA) {
239 		int irq;
240 		/*
241 		 * Note: ASIC PCI's builtin interrupt acknowledge feature is
242 		 * broken.  Using it may result in loss of some or all i8259
243 		 * interrupts, so don't use PCIMT_INT_ACKNOWLEDGE ...
244 		 */
245 		irq = i8259_irq();
246 		if (unlikely(irq < 0))
247 			return;
248 
249 		do_IRQ(irq);
250 	}
251 
252 	if (!(pend & IT_SCSI)) {
253 		flags = read_c0_status();
254 		clear_c0_status(ST0_IM);
255 		do_IRQ(PCIMT_IRQ_SCSI);
256 		write_c0_status(flags);
257 	}
258 }
259 
260 /*
261  * hwint 3 should deal with the PCI A - D interrupts,
262  */
pcimt_hwint3(void)263 static void pcimt_hwint3(void)
264 {
265 	u8 pend = *(volatile char *)PCIMT_CSITPEND;
266 	int irq;
267 
268 	pend &= (IT_INTA | IT_INTB | IT_INTC | IT_INTD);
269 	pend ^= (IT_INTA | IT_INTB | IT_INTC | IT_INTD);
270 	clear_c0_status(IE_IRQ3);
271 	irq = PCIMT_IRQ_INT2 + ffs(pend) - 1;
272 	do_IRQ(irq);
273 	set_c0_status(IE_IRQ3);
274 }
275 
sni_pcimt_hwint(void)276 static void sni_pcimt_hwint(void)
277 {
278 	u32 pending = read_c0_cause() & read_c0_status();
279 
280 	if (pending & C_IRQ5)
281 		do_IRQ(MIPS_CPU_IRQ_BASE + 7);
282 	else if (pending & C_IRQ4)
283 		do_IRQ(MIPS_CPU_IRQ_BASE + 6);
284 	else if (pending & C_IRQ3)
285 		pcimt_hwint3();
286 	else if (pending & C_IRQ1)
287 		pcimt_hwint1();
288 	else if (pending & C_IRQ0) {
289 		pcimt_hwint0();
290 	}
291 }
292 
sni_pcimt_irq_init(void)293 void __init sni_pcimt_irq_init(void)
294 {
295 	int i;
296 
297 	*(volatile u8 *) PCIMT_IRQSEL = IT_ETH | IT_EISA;
298 	mips_cpu_irq_init();
299 	/* Actually we've got more interrupts to handle ...  */
300 	for (i = PCIMT_IRQ_INT2; i <= PCIMT_IRQ_SCSI; i++)
301 		irq_set_chip_and_handler(i, &pcimt_irq_type, handle_level_irq);
302 	sni_hwint = sni_pcimt_hwint;
303 	change_c0_status(ST0_IM, IE_IRQ1|IE_IRQ3);
304 }
305 
sni_pcimt_init(void)306 void __init sni_pcimt_init(void)
307 {
308 	sni_pcimt_detect();
309 	sni_pcimt_sc_init();
310 	ioport_resource.end = sni_io_resource.end;
311 #ifdef CONFIG_PCI
312 	PCIBIOS_MIN_IO = 0x9000;
313 	register_pci_controller(&sni_controller);
314 #endif
315 	sni_pcimt_resource_init();
316 }
317 
snirm_pcimt_setup_devinit(void)318 static int __init snirm_pcimt_setup_devinit(void)
319 {
320 	switch (sni_brd_type) {
321 	case SNI_BRD_PCI_MTOWER:
322 	case SNI_BRD_PCI_DESKTOP:
323 	case SNI_BRD_PCI_MTOWER_CPLUS:
324 		platform_device_register(&pcimt_serial8250_device);
325 		platform_device_register(&pcimt_cmos_device);
326 		break;
327 	}
328 
329 	return 0;
330 }
331 
332 device_initcall(snirm_pcimt_setup_devinit);
333