1 /*
2 * linux/arch/arm/mach-sa1100/neponset.c
3 *
4 */
5 #include <linux/kernel.h>
6 #include <linux/init.h>
7 #include <linux/tty.h>
8 #include <linux/ioport.h>
9 #include <linux/serial_core.h>
10 #include <linux/platform_device.h>
11 #include <linux/slab.h>
12
13 #include <mach/hardware.h>
14 #include <asm/mach-types.h>
15 #include <asm/irq.h>
16 #include <asm/mach/map.h>
17 #include <asm/mach/irq.h>
18 #include <asm/mach/serial_sa1100.h>
19 #include <mach/assabet.h>
20 #include <mach/neponset.h>
21 #include <asm/hardware/sa1111.h>
22 #include <asm/sizes.h>
23
24 /*
25 * Install handler for Neponset IRQ. Note that we have to loop here
26 * since the ETHERNET and USAR IRQs are level based, and we need to
27 * ensure that the IRQ signal is deasserted before returning. This
28 * is rather unfortunate.
29 */
30 static void
31 neponset_irq_handler(unsigned int irq, struct irq_desc *desc)
32 {
33 unsigned int irr;
34
35 while (1) {
36 /*
37 * Acknowledge the parent IRQ.
38 */
39 desc->chip->ack(irq);
40
41 /*
42 * Read the interrupt reason register. Let's have all
43 * active IRQ bits high. Note: there is a typo in the
44 * Neponset user's guide for the SA1111 IRR level.
45 */
46 irr = IRR ^ (IRR_ETHERNET | IRR_USAR);
47
48 if ((irr & (IRR_ETHERNET | IRR_USAR | IRR_SA1111)) == 0)
49 break;
50
51 /*
52 * Since there is no individual mask, we have to
53 * mask the parent IRQ. This is safe, since we'll
54 * recheck the register for any pending IRQs.
55 */
56 if (irr & (IRR_ETHERNET | IRR_USAR)) {
57 desc->chip->mask(irq);
58
59 /*
60 * Ack the interrupt now to prevent re-entering
61 * this neponset handler. Again, this is safe
62 * since we'll check the IRR register prior to
63 * leaving.
64 */
65 desc->chip->ack(irq);
66
67 if (irr & IRR_ETHERNET) {
68 generic_handle_irq(IRQ_NEPONSET_SMC9196);
69 }
70
71 if (irr & IRR_USAR) {
72 generic_handle_irq(IRQ_NEPONSET_USAR);
73 }
74
75 desc->chip->unmask(irq);
76 }
77
78 if (irr & IRR_SA1111) {
79 generic_handle_irq(IRQ_NEPONSET_SA1111);
80 }
81 }
82 }
83
84 static void neponset_set_mctrl(struct uart_port *port, u_int mctrl)
85 {
86 u_int mdm_ctl0 = MDM_CTL_0;
87
88 if (port->mapbase == _Ser1UTCR0) {
89 if (mctrl & TIOCM_RTS)
90 mdm_ctl0 &= ~MDM_CTL0_RTS2;
91 else
92 mdm_ctl0 |= MDM_CTL0_RTS2;
93
94 if (mctrl & TIOCM_DTR)
95 mdm_ctl0 &= ~MDM_CTL0_DTR2;
96 else
97 mdm_ctl0 |= MDM_CTL0_DTR2;
98 } else if (port->mapbase == _Ser3UTCR0) {
99 if (mctrl & TIOCM_RTS)
100 mdm_ctl0 &= ~MDM_CTL0_RTS1;
101 else
102 mdm_ctl0 |= MDM_CTL0_RTS1;
103
104 if (mctrl & TIOCM_DTR)
105 mdm_ctl0 &= ~MDM_CTL0_DTR1;
106 else
107 mdm_ctl0 |= MDM_CTL0_DTR1;
108 }
109
110 MDM_CTL_0 = mdm_ctl0;
111 }
112
113 static u_int neponset_get_mctrl(struct uart_port *port)
114 {
115 u_int ret = TIOCM_CD | TIOCM_CTS | TIOCM_DSR;
116 u_int mdm_ctl1 = MDM_CTL_1;
117
118 if (port->mapbase == _Ser1UTCR0) {
119 if (mdm_ctl1 & MDM_CTL1_DCD2)
120 ret &= ~TIOCM_CD;
121 if (mdm_ctl1 & MDM_CTL1_CTS2)
122 ret &= ~TIOCM_CTS;
123 if (mdm_ctl1 & MDM_CTL1_DSR2)
124 ret &= ~TIOCM_DSR;
125 } else if (port->mapbase == _Ser3UTCR0) {
126 if (mdm_ctl1 & MDM_CTL1_DCD1)
127 ret &= ~TIOCM_CD;
128 if (mdm_ctl1 & MDM_CTL1_CTS1)
129 ret &= ~TIOCM_CTS;
130 if (mdm_ctl1 & MDM_CTL1_DSR1)
131 ret &= ~TIOCM_DSR;
132 }
133
134 return ret;
135 }
136
137 static struct sa1100_port_fns neponset_port_fns __devinitdata = {
138 .set_mctrl = neponset_set_mctrl,
139 .get_mctrl = neponset_get_mctrl,
140 };
141
142 static int __devinit neponset_probe(struct platform_device *dev)
143 {
144 sa1100_register_uart_fns(&neponset_port_fns);
145
146 /*
147 * Install handler for GPIO25.
148 */
149 set_irq_type(IRQ_GPIO25, IRQ_TYPE_EDGE_RISING);
150 set_irq_chained_handler(IRQ_GPIO25, neponset_irq_handler);
151
152 /*
153 * We would set IRQ_GPIO25 to be a wake-up IRQ, but
154 * unfortunately something on the Neponset activates
155 * this IRQ on sleep (ethernet?)
156 */
157 #if 0
158 enable_irq_wake(IRQ_GPIO25);
159 #endif
160
161 /*
162 * Setup other Neponset IRQs. SA1111 will be done by the
163 * generic SA1111 code.
164 */
165 set_irq_handler(IRQ_NEPONSET_SMC9196, handle_simple_irq);
166 set_irq_flags(IRQ_NEPONSET_SMC9196, IRQF_VALID | IRQF_PROBE);
167 set_irq_handler(IRQ_NEPONSET_USAR, handle_simple_irq);
168 set_irq_flags(IRQ_NEPONSET_USAR, IRQF_VALID | IRQF_PROBE);
169
170 /*
171 * Disable GPIO 0/1 drivers so the buttons work on the module.
172 */
173 NCR_0 = NCR_GP01_OFF;
174
175 return 0;
176 }
177
178 #ifdef CONFIG_PM
179
180 /*
181 * LDM power management.
182 */
183 static unsigned int neponset_saved_state;
184
185 static int neponset_suspend(struct platform_device *dev, pm_message_t state)
186 {
187 /*
188 * Save state.
189 */
190 neponset_saved_state = NCR_0;
191
192 return 0;
193 }
194
195 static int neponset_resume(struct platform_device *dev)
196 {
197 NCR_0 = neponset_saved_state;
198
199 return 0;
200 }
201
202 #else
203 #define neponset_suspend NULL
204 #define neponset_resume NULL
205 #endif
206
207 static struct platform_driver neponset_device_driver = {
208 .probe = neponset_probe,
209 .suspend = neponset_suspend,
210 .resume = neponset_resume,
211 .driver = {
212 .name = "neponset",
213 },
214 };
215
216 static struct resource neponset_resources[] = {
217 [0] = {
218 .start = 0x10000000,
219 .end = 0x17ffffff,
220 .flags = IORESOURCE_MEM,
221 },
222 };
223
224 static struct platform_device neponset_device = {
225 .name = "neponset",
226 .id = 0,
227 .num_resources = ARRAY_SIZE(neponset_resources),
228 .resource = neponset_resources,
229 };
230
231 static struct resource sa1111_resources[] = {
232 [0] = {
233 .start = 0x40000000,
234 .end = 0x40001fff,
235 .flags = IORESOURCE_MEM,
236 },
237 [1] = {
238 .start = IRQ_NEPONSET_SA1111,
239 .end = IRQ_NEPONSET_SA1111,
240 .flags = IORESOURCE_IRQ,
241 },
242 };
243
244 static u64 sa1111_dmamask = 0xffffffffUL;
245
246 static struct platform_device sa1111_device = {
247 .name = "sa1111",
248 .id = 0,
249 .dev = {
250 .dma_mask = &sa1111_dmamask,
251 .coherent_dma_mask = 0xffffffff,
252 },
253 .num_resources = ARRAY_SIZE(sa1111_resources),
254 .resource = sa1111_resources,
255 };
256
257 static struct resource smc91x_resources[] = {
258 [0] = {
259 .name = "smc91x-regs",
260 .start = SA1100_CS3_PHYS,
261 .end = SA1100_CS3_PHYS + 0x01ffffff,
262 .flags = IORESOURCE_MEM,
263 },
264 [1] = {
265 .start = IRQ_NEPONSET_SMC9196,
266 .end = IRQ_NEPONSET_SMC9196,
267 .flags = IORESOURCE_IRQ,
268 },
269 [2] = {
270 .name = "smc91x-attrib",
271 .start = SA1100_CS3_PHYS + 0x02000000,
272 .end = SA1100_CS3_PHYS + 0x03ffffff,
273 .flags = IORESOURCE_MEM,
274 },
275 };
276
277 static struct platform_device smc91x_device = {
278 .name = "smc91x",
279 .id = 0,
280 .num_resources = ARRAY_SIZE(smc91x_resources),
281 .resource = smc91x_resources,
282 };
283
284 static struct platform_device *devices[] __initdata = {
285 &neponset_device,
286 &sa1111_device,
287 &smc91x_device,
288 };
289
290 extern void sa1110_mb_disable(void);
291
292 static int __init neponset_init(void)
293 {
294 platform_driver_register(&neponset_device_driver);
295
296 /*
297 * The Neponset is only present on the Assabet machine type.
298 */
299 if (!machine_is_assabet())
300 return -ENODEV;
301
302 /*
303 * Ensure that the memory bus request/grant signals are setup,
304 * and the grant is held in its inactive state, whether or not
305 * we actually have a Neponset attached.
306 */
307 sa1110_mb_disable();
308
309 if (!machine_has_neponset()) {
310 printk(KERN_DEBUG "Neponset expansion board not present\n");
311 return -ENODEV;
312 }
313
314 if (WHOAMI != 0x11) {
315 printk(KERN_WARNING "Neponset board detected, but "
316 "wrong ID: %02x\n", WHOAMI);
317 return -ENODEV;
318 }
319
320 return platform_add_devices(devices, ARRAY_SIZE(devices));
321 }
322
323 subsys_initcall(neponset_init);
324
325 static struct map_desc neponset_io_desc[] __initdata = {
326 { /* System Registers */
327 .virtual = 0xf3000000,
328 .pfn = __phys_to_pfn(0x10000000),
329 .length = SZ_1M,
330 .type = MT_DEVICE
331 }, { /* SA-1111 */
332 .virtual = 0xf4000000,
333 .pfn = __phys_to_pfn(0x40000000),
334 .length = SZ_1M,
335 .type = MT_DEVICE
336 }
337 };
338
339 void __init neponset_map_io(void)
340 {
341 iotable_init(neponset_io_desc, ARRAY_SIZE(neponset_io_desc));
342 }
343
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