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authorMikael Starvik <mikael.starvik@axis.com>2005-07-27 14:44:35 -0400
committerLinus Torvalds <torvalds@g5.osdl.org>2005-07-27 19:26:00 -0400
commit63245d2cde2be64f172388c2c50862f233c05700 (patch)
treec5f41dca80044bf4820e9c65eaa9844eb89493f6 /arch/cris
parent7e9204265b4ec6680fad9abc7a78b94087983916 (diff)
[PATCH] CRIS update: I/O and DMA allocator
Added I/O and DMA allocators to be used by drivers. Signed-off-by: Mikael Starvik <starvik@axis.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'arch/cris')
-rw-r--r--arch/cris/arch-v10/kernel/dma.c287
-rw-r--r--arch/cris/arch-v10/kernel/head.S126
-rw-r--r--arch/cris/arch-v10/kernel/io_interface_mux.c879
-rw-r--r--arch/cris/arch-v10/kernel/shadows.c3
4 files changed, 1223 insertions, 72 deletions
diff --git a/arch/cris/arch-v10/kernel/dma.c b/arch/cris/arch-v10/kernel/dma.c
new file mode 100644
index 000000000000..e9a0311b141d
--- /dev/null
+++ b/arch/cris/arch-v10/kernel/dma.c
@@ -0,0 +1,287 @@
1/* Wrapper for DMA channel allocator that updates DMA client muxing.
2 * Copyright 2004, Axis Communications AB
3 * $Id: dma.c,v 1.1 2004/12/13 12:21:51 starvik Exp $
4 */
5
6#include <linux/kernel.h>
7#include <linux/module.h>
8#include <linux/errno.h>
9
10#include <asm/dma.h>
11#include <asm/arch/svinto.h>
12
13/* Macro to access ETRAX 100 registers */
14#define SETS(var, reg, field, val) var = (var & ~IO_MASK_(reg##_, field##_)) | \
15 IO_STATE_(reg##_, field##_, _##val)
16
17
18static char used_dma_channels[MAX_DMA_CHANNELS];
19static const char * used_dma_channels_users[MAX_DMA_CHANNELS];
20
21int cris_request_dma(unsigned int dmanr, const char * device_id,
22 unsigned options, enum dma_owner owner)
23{
24 unsigned long flags;
25 unsigned long int gens;
26 int fail = -EINVAL;
27
28 if ((dmanr < 0) || (dmanr >= MAX_DMA_CHANNELS)) {
29 printk(KERN_CRIT "cris_request_dma: invalid DMA channel %u\n", dmanr);
30 return -EINVAL;
31 }
32
33 local_irq_save(flags);
34 if (used_dma_channels[dmanr]) {
35 local_irq_restore(flags);
36 if (options & DMA_VERBOSE_ON_ERROR) {
37 printk(KERN_CRIT "Failed to request DMA %i for %s, already allocated by %s\n", dmanr, device_id, used_dma_channels_users[dmanr]);
38 }
39 if (options & DMA_PANIC_ON_ERROR) {
40 panic("request_dma error!");
41 }
42 return -EBUSY;
43 }
44
45 gens = genconfig_shadow;
46
47 switch(owner)
48 {
49 case dma_eth:
50 if ((dmanr != NETWORK_TX_DMA_NBR) &&
51 (dmanr != NETWORK_RX_DMA_NBR)) {
52 printk(KERN_CRIT "Invalid DMA channel for eth\n");
53 goto bail;
54 }
55 break;
56 case dma_ser0:
57 if (dmanr == SER0_TX_DMA_NBR) {
58 SETS(gens, R_GEN_CONFIG, dma6, serial0);
59 } else if (dmanr == SER0_RX_DMA_NBR) {
60 SETS(gens, R_GEN_CONFIG, dma7, serial0);
61 } else {
62 printk(KERN_CRIT "Invalid DMA channel for ser0\n");
63 goto bail;
64 }
65 break;
66 case dma_ser1:
67 if (dmanr == SER1_TX_DMA_NBR) {
68 SETS(gens, R_GEN_CONFIG, dma8, serial1);
69 } else if (dmanr == SER1_RX_DMA_NBR) {
70 SETS(gens, R_GEN_CONFIG, dma9, serial1);
71 } else {
72 printk(KERN_CRIT "Invalid DMA channel for ser1\n");
73 goto bail;
74 }
75 break;
76 case dma_ser2:
77 if (dmanr == SER2_TX_DMA_NBR) {
78 SETS(gens, R_GEN_CONFIG, dma2, serial2);
79 } else if (dmanr == SER2_RX_DMA_NBR) {
80 SETS(gens, R_GEN_CONFIG, dma3, serial2);
81 } else {
82 printk(KERN_CRIT "Invalid DMA channel for ser2\n");
83 goto bail;
84 }
85 break;
86 case dma_ser3:
87 if (dmanr == SER3_TX_DMA_NBR) {
88 SETS(gens, R_GEN_CONFIG, dma4, serial3);
89 } else if (dmanr == SER3_RX_DMA_NBR) {
90 SETS(gens, R_GEN_CONFIG, dma5, serial3);
91 } else {
92 printk(KERN_CRIT "Invalid DMA channel for ser3\n");
93 goto bail;
94 }
95 break;
96 case dma_ata:
97 if (dmanr == ATA_TX_DMA_NBR) {
98 SETS(gens, R_GEN_CONFIG, dma2, ata);
99 } else if (dmanr == ATA_RX_DMA_NBR) {
100 SETS(gens, R_GEN_CONFIG, dma3, ata);
101 } else {
102 printk(KERN_CRIT "Invalid DMA channel for ata\n");
103 goto bail;
104 }
105 break;
106 case dma_ext0:
107 if (dmanr == EXTDMA0_TX_DMA_NBR) {
108 SETS(gens, R_GEN_CONFIG, dma4, extdma0);
109 } else if (dmanr == EXTDMA0_RX_DMA_NBR) {
110 SETS(gens, R_GEN_CONFIG, dma5, extdma0);
111 } else {
112 printk(KERN_CRIT "Invalid DMA channel for ext0\n");
113 goto bail;
114 }
115 break;
116 case dma_ext1:
117 if (dmanr == EXTDMA1_TX_DMA_NBR) {
118 SETS(gens, R_GEN_CONFIG, dma6, extdma1);
119 } else if (dmanr == EXTDMA1_RX_DMA_NBR) {
120 SETS(gens, R_GEN_CONFIG, dma7, extdma1);
121 } else {
122 printk(KERN_CRIT "Invalid DMA channel for ext1\n");
123 goto bail;
124 }
125 break;
126 case dma_int6:
127 if (dmanr == MEM2MEM_RX_DMA_NBR) {
128 SETS(gens, R_GEN_CONFIG, dma7, intdma6);
129 } else {
130 printk(KERN_CRIT "Invalid DMA channel for int6\n");
131 goto bail;
132 }
133 break;
134 case dma_int7:
135 if (dmanr == MEM2MEM_TX_DMA_NBR) {
136 SETS(gens, R_GEN_CONFIG, dma6, intdma7);
137 } else {
138 printk(KERN_CRIT "Invalid DMA channel for int7\n");
139 goto bail;
140 }
141 break;
142 case dma_usb:
143 if (dmanr == USB_TX_DMA_NBR) {
144 SETS(gens, R_GEN_CONFIG, dma8, usb);
145 } else if (dmanr == USB_RX_DMA_NBR) {
146 SETS(gens, R_GEN_CONFIG, dma9, usb);
147 } else {
148 printk(KERN_CRIT "Invalid DMA channel for usb\n");
149 goto bail;
150 }
151 break;
152 case dma_scsi0:
153 if (dmanr == SCSI0_TX_DMA_NBR) {
154 SETS(gens, R_GEN_CONFIG, dma2, scsi0);
155 } else if (dmanr == SCSI0_RX_DMA_NBR) {
156 SETS(gens, R_GEN_CONFIG, dma3, scsi0);
157 } else {
158 printk(KERN_CRIT "Invalid DMA channel for scsi0\n");
159 goto bail;
160 }
161 break;
162 case dma_scsi1:
163 if (dmanr == SCSI1_TX_DMA_NBR) {
164 SETS(gens, R_GEN_CONFIG, dma4, scsi1);
165 } else if (dmanr == SCSI1_RX_DMA_NBR) {
166 SETS(gens, R_GEN_CONFIG, dma5, scsi1);
167 } else {
168 printk(KERN_CRIT "Invalid DMA channel for scsi1\n");
169 goto bail;
170 }
171 break;
172 case dma_par0:
173 if (dmanr == PAR0_TX_DMA_NBR) {
174 SETS(gens, R_GEN_CONFIG, dma2, par0);
175 } else if (dmanr == PAR0_RX_DMA_NBR) {
176 SETS(gens, R_GEN_CONFIG, dma3, par0);
177 } else {
178 printk(KERN_CRIT "Invalid DMA channel for par0\n");
179 goto bail;
180 }
181 break;
182 case dma_par1:
183 if (dmanr == PAR1_TX_DMA_NBR) {
184 SETS(gens, R_GEN_CONFIG, dma4, par1);
185 } else if (dmanr == PAR1_RX_DMA_NBR) {
186 SETS(gens, R_GEN_CONFIG, dma5, par1);
187 } else {
188 printk(KERN_CRIT "Invalid DMA channel for par1\n");
189 goto bail;
190 }
191 break;
192 default:
193 printk(KERN_CRIT "Invalid DMA owner.\n");
194 goto bail;
195 }
196
197 used_dma_channels[dmanr] = 1;
198 used_dma_channels_users[dmanr] = device_id;
199
200 {
201 volatile int i;
202 genconfig_shadow = gens;
203 *R_GEN_CONFIG = genconfig_shadow;
204 /* Wait 12 cycles before doing any DMA command */
205 for(i = 6; i > 0; i--)
206 nop();
207 }
208 fail = 0;
209 bail:
210 local_irq_restore(flags);
211 return fail;
212}
213
214void cris_free_dma(unsigned int dmanr, const char * device_id)
215{
216 unsigned long flags;
217 if ((dmanr < 0) || (dmanr >= MAX_DMA_CHANNELS)) {
218 printk(KERN_CRIT "cris_free_dma: invalid DMA channel %u\n", dmanr);
219 return;
220 }
221
222 local_irq_save(flags);
223 if (!used_dma_channels[dmanr]) {
224 printk(KERN_CRIT "cris_free_dma: DMA channel %u not allocated\n", dmanr);
225 } else if (device_id != used_dma_channels_users[dmanr]) {
226 printk(KERN_CRIT "cris_free_dma: DMA channel %u not allocated by device\n", dmanr);
227 } else {
228 switch(dmanr)
229 {
230 case 0:
231 *R_DMA_CH0_CMD = IO_STATE(R_DMA_CH0_CMD, cmd, reset);
232 while (IO_EXTRACT(R_DMA_CH0_CMD, cmd, *R_DMA_CH0_CMD) ==
233 IO_STATE_VALUE(R_DMA_CH0_CMD, cmd, reset));
234 break;
235 case 1:
236 *R_DMA_CH1_CMD = IO_STATE(R_DMA_CH1_CMD, cmd, reset);
237 while (IO_EXTRACT(R_DMA_CH1_CMD, cmd, *R_DMA_CH1_CMD) ==
238 IO_STATE_VALUE(R_DMA_CH1_CMD, cmd, reset));
239 break;
240 case 2:
241 *R_DMA_CH2_CMD = IO_STATE(R_DMA_CH2_CMD, cmd, reset);
242 while (IO_EXTRACT(R_DMA_CH2_CMD, cmd, *R_DMA_CH2_CMD) ==
243 IO_STATE_VALUE(R_DMA_CH2_CMD, cmd, reset));
244 break;
245 case 3:
246 *R_DMA_CH3_CMD = IO_STATE(R_DMA_CH3_CMD, cmd, reset);
247 while (IO_EXTRACT(R_DMA_CH3_CMD, cmd, *R_DMA_CH3_CMD) ==
248 IO_STATE_VALUE(R_DMA_CH3_CMD, cmd, reset));
249 break;
250 case 4:
251 *R_DMA_CH4_CMD = IO_STATE(R_DMA_CH4_CMD, cmd, reset);
252 while (IO_EXTRACT(R_DMA_CH4_CMD, cmd, *R_DMA_CH4_CMD) ==
253 IO_STATE_VALUE(R_DMA_CH4_CMD, cmd, reset));
254 break;
255 case 5:
256 *R_DMA_CH5_CMD = IO_STATE(R_DMA_CH5_CMD, cmd, reset);
257 while (IO_EXTRACT(R_DMA_CH5_CMD, cmd, *R_DMA_CH5_CMD) ==
258 IO_STATE_VALUE(R_DMA_CH5_CMD, cmd, reset));
259 break;
260 case 6:
261 *R_DMA_CH6_CMD = IO_STATE(R_DMA_CH6_CMD, cmd, reset);
262 while (IO_EXTRACT(R_DMA_CH6_CMD, cmd, *R_DMA_CH6_CMD) ==
263 IO_STATE_VALUE(R_DMA_CH6_CMD, cmd, reset));
264 break;
265 case 7:
266 *R_DMA_CH7_CMD = IO_STATE(R_DMA_CH7_CMD, cmd, reset);
267 while (IO_EXTRACT(R_DMA_CH7_CMD, cmd, *R_DMA_CH7_CMD) ==
268 IO_STATE_VALUE(R_DMA_CH7_CMD, cmd, reset));
269 break;
270 case 8:
271 *R_DMA_CH8_CMD = IO_STATE(R_DMA_CH8_CMD, cmd, reset);
272 while (IO_EXTRACT(R_DMA_CH8_CMD, cmd, *R_DMA_CH8_CMD) ==
273 IO_STATE_VALUE(R_DMA_CH8_CMD, cmd, reset));
274 break;
275 case 9:
276 *R_DMA_CH9_CMD = IO_STATE(R_DMA_CH9_CMD, cmd, reset);
277 while (IO_EXTRACT(R_DMA_CH9_CMD, cmd, *R_DMA_CH9_CMD) ==
278 IO_STATE_VALUE(R_DMA_CH9_CMD, cmd, reset));
279 break;
280 }
281 used_dma_channels[dmanr] = 0;
282 }
283 local_irq_restore(flags);
284}
285
286EXPORT_SYMBOL(cris_request_dma);
287EXPORT_SYMBOL(cris_free_dma);
diff --git a/arch/cris/arch-v10/kernel/head.S b/arch/cris/arch-v10/kernel/head.S
index 2c1dd1184a8f..f00c145b43f1 100644
--- a/arch/cris/arch-v10/kernel/head.S
+++ b/arch/cris/arch-v10/kernel/head.S
@@ -1,4 +1,4 @@
1/* $Id: head.S,v 1.7 2004/05/14 07:58:01 starvik Exp $ 1/* $Id: head.S,v 1.10 2005/06/20 05:12:54 starvik Exp $
2 * 2 *
3 * Head of the kernel - alter with care 3 * Head of the kernel - alter with care
4 * 4 *
@@ -7,6 +7,16 @@
7 * Authors: Bjorn Wesen (bjornw@axis.com) 7 * Authors: Bjorn Wesen (bjornw@axis.com)
8 * 8 *
9 * $Log: head.S,v $ 9 * $Log: head.S,v $
10 * Revision 1.10 2005/06/20 05:12:54 starvik
11 * Remove unnecessary diff to kernel.org tree
12 *
13 * Revision 1.9 2004/12/13 12:21:51 starvik
14 * Added I/O and DMA allocators from Linux 2.4
15 *
16 * Revision 1.8 2004/11/22 11:41:14 starvik
17 * Kernel command line may be supplied to kernel. Not used by Axis but may
18 * be used by customers.
19 *
10 * Revision 1.7 2004/05/14 07:58:01 starvik 20 * Revision 1.7 2004/05/14 07:58:01 starvik
11 * Merge of changes from 2.4 21 * Merge of changes from 2.4
12 * 22 *
@@ -181,6 +191,7 @@
181 191
182#define CRAMFS_MAGIC 0x28cd3d45 192#define CRAMFS_MAGIC 0x28cd3d45
183#define RAM_INIT_MAGIC 0x56902387 193#define RAM_INIT_MAGIC 0x56902387
194#define COMMAND_LINE_MAGIC 0x87109563
184 195
185#define START_ETHERNET_CLOCK IO_STATE(R_NETWORK_GEN_CONFIG, enable, on) |\ 196#define START_ETHERNET_CLOCK IO_STATE(R_NETWORK_GEN_CONFIG, enable, on) |\
186 IO_STATE(R_NETWORK_GEN_CONFIG, phy, mii_clk) 197 IO_STATE(R_NETWORK_GEN_CONFIG, phy, mii_clk)
@@ -490,6 +501,23 @@ _no_romfs_in_flash:
490 501
491_start_it: 502_start_it:
492 503
504 ;; Check if kernel command line is supplied
505 cmp.d COMMAND_LINE_MAGIC, $r10
506 bne no_command_line
507 nop
508
509 move.d 256, $r13
510 move.d cris_command_line, $r10
511 or.d 0x80000000, $r11 ; Make it virtual
5121:
513 move.b [$r11+], $r12
514 move.b $r12, [$r10+]
515 subq 1, $r13
516 bne 1b
517 nop
518
519no_command_line:
520
493 ;; the kernel stack is overlayed with the task structure for each 521 ;; the kernel stack is overlayed with the task structure for each
494 ;; task. thus the initial kernel stack is in the same page as the 522 ;; task. thus the initial kernel stack is in the same page as the
495 ;; init_task (but starts in the top of the page, size 8192) 523 ;; init_task (but starts in the top of the page, size 8192)
@@ -567,76 +595,32 @@ _start_it:
567 ;; Etrax product HW genconfig setup 595 ;; Etrax product HW genconfig setup
568 596
569 moveq 0,$r0 597 moveq 0,$r0
570#if (!defined(CONFIG_ETRAX_KGDB) || !defined(CONFIG_ETRAX_DEBUG_PORT0)) \ 598
571 && !defined(CONFIG_DMA_MEMCPY) 599 ;; Init interfaces (disable them).
572 ; DMA channels 6 and 7 to ser0, kgdb doesnt want DMA 600 or.d IO_STATE (R_GEN_CONFIG, scsi0, disable) \
573 or.d IO_STATE (R_GEN_CONFIG, dma7, serial0) \ 601 | IO_STATE (R_GEN_CONFIG, ata, disable) \
574 | IO_STATE (R_GEN_CONFIG, dma6, serial0),$r0 602 | IO_STATE (R_GEN_CONFIG, par0, disable) \
575#endif 603 | IO_STATE (R_GEN_CONFIG, ser2, disable) \
576#if !defined(CONFIG_ETRAX_KGDB) || !defined(CONFIG_ETRAX_DEBUG_PORT1) 604 | IO_STATE (R_GEN_CONFIG, mio, disable) \
577 ; DMA channels 8 and 9 to ser1, kgdb doesnt want DMA 605 | IO_STATE (R_GEN_CONFIG, scsi1, disable) \
578 or.d IO_STATE (R_GEN_CONFIG, dma9, serial1) \ 606 | IO_STATE (R_GEN_CONFIG, scsi0w, disable) \
579 | IO_STATE (R_GEN_CONFIG, dma8, serial1),$r0 607 | IO_STATE (R_GEN_CONFIG, par1, disable) \
580#endif 608 | IO_STATE (R_GEN_CONFIG, ser3, disable) \
581#ifdef CONFIG_DMA_MEMCPY 609 | IO_STATE (R_GEN_CONFIG, mio_w, disable) \
582 ; 6/7 memory-memory DMA 610 | IO_STATE (R_GEN_CONFIG, usb1, disable) \
583 or.d IO_STATE (R_GEN_CONFIG, dma7, intdma6) \ 611 | IO_STATE (R_GEN_CONFIG, usb2, disable) \
584 | IO_STATE (R_GEN_CONFIG, dma6, intdma7),$r0 612 | IO_STATE (R_GEN_CONFIG, par_w, disable),$r0
585#endif 613
586#ifdef CONFIG_ETRAX_SERIAL_PORT2 614 ;; Init DMA channel muxing (set to unused clients).
587 ; Enable serial port 2 615 or.d IO_STATE (R_GEN_CONFIG, dma2, ata) \
588 or.w IO_STATE (R_GEN_CONFIG, ser2, select),$r0 616 | IO_STATE (R_GEN_CONFIG, dma3, ata) \
589#if !defined(CONFIG_ETRAX_KGDB) || !defined(CONFIG_ETRAX_DEBUG_PORT2) 617 | IO_STATE (R_GEN_CONFIG, dma4, scsi1) \
590 ; DMA channels 2 and 3 to ser2, kgdb doesnt want DMA 618 | IO_STATE (R_GEN_CONFIG, dma5, scsi1) \
591 or.d IO_STATE (R_GEN_CONFIG, dma3, serial2) \ 619 | IO_STATE (R_GEN_CONFIG, dma6, unused) \
592 | IO_STATE (R_GEN_CONFIG, dma2, serial2),$r0 620 | IO_STATE (R_GEN_CONFIG, dma7, unused) \
593#endif 621 | IO_STATE (R_GEN_CONFIG, dma8, usb) \
594#endif 622 | IO_STATE (R_GEN_CONFIG, dma9, usb),$r0
595#if defined(CONFIG_ETRAX_SERIAL_PORT3) || defined(CONFIG_ETRAX_SYNCHRONOUS_SERIAL_PORT1) 623
596 ; Enable serial port 3
597 or.w IO_STATE (R_GEN_CONFIG, ser3, select),$r0
598#if !defined(CONFIG_ETRAX_KGDB) || !defined(CONFIG_ETRAX_DEBUG_PORT3)
599 ; DMA channels 4 and 5 to ser3, kgdb doesnt want DMA
600 or.d IO_STATE (R_GEN_CONFIG, dma5, serial3) \
601 | IO_STATE (R_GEN_CONFIG, dma4, serial3),$r0
602#endif
603#endif
604#if defined(CONFIG_ETRAX_PARALLEL_PORT0) || defined(CONFIG_ETRAX_ETHERNET_LPSLAVE)
605 ; parport 0 enabled using DMA 2/3
606 or.w IO_STATE (R_GEN_CONFIG, par0, select),$r0
607#endif
608#if defined(CONFIG_ETRAX_PARALLEL_PORT1) || defined(CONFIG_ETRAX_ETHERNET_LPSLAVE)
609 ; parport 1 enabled using DMA 4/5
610 or.w IO_STATE (R_GEN_CONFIG, par1, select),$r0
611#endif
612#ifdef CONFIG_ETRAX_IDE
613 ; DMA channels 2 and 3 to ATA, ATA enabled
614 or.d IO_STATE (R_GEN_CONFIG, dma3, ata) \
615 | IO_STATE (R_GEN_CONFIG, dma2, ata) \
616 | IO_STATE (R_GEN_CONFIG, ata, select),$r0
617#endif
618
619#ifdef CONFIG_ETRAX_USB_HOST_PORT1
620 ; Set the USB port 1 enable bit
621 or.d IO_STATE (R_GEN_CONFIG, usb1, select),$r0
622#endif
623#ifdef CONFIG_ETRAX_USB_HOST_PORT2
624 ; Set the USB port 2 enable bit
625 or.d IO_STATE (R_GEN_CONFIG, usb2, select),$r0
626#endif
627#ifdef CONFIG_ETRAX_USB_HOST
628 ; Connect DMA channels 8 and 9 to USB
629 and.d (~(IO_MASK (R_GEN_CONFIG, dma9) \
630 | IO_MASK (R_GEN_CONFIG, dma8))) \
631 | IO_STATE (R_GEN_CONFIG, dma9, usb) \
632 | IO_STATE (R_GEN_CONFIG, dma8, usb),$r0
633#endif
634
635#ifdef CONFIG_JULIETTE
636 ; DMA channels 4 and 5 to EXTDMA0, for Juliette
637 or.d IO_STATE (R_GEN_CONFIG, dma5, extdma0) \
638 | IO_STATE (R_GEN_CONFIG, dma4, extdma0),$r0
639#endif
640 624
641#if defined(CONFIG_ETRAX_DEF_R_PORT_G0_DIR_OUT) 625#if defined(CONFIG_ETRAX_DEF_R_PORT_G0_DIR_OUT)
642 or.d IO_STATE (R_GEN_CONFIG, g0dir, out),$r0 626 or.d IO_STATE (R_GEN_CONFIG, g0dir, out),$r0
diff --git a/arch/cris/arch-v10/kernel/io_interface_mux.c b/arch/cris/arch-v10/kernel/io_interface_mux.c
new file mode 100644
index 000000000000..29d48ad00df9
--- /dev/null
+++ b/arch/cris/arch-v10/kernel/io_interface_mux.c
@@ -0,0 +1,879 @@
1/* IO interface mux allocator for ETRAX100LX.
2 * Copyright 2004, Axis Communications AB
3 * $Id: io_interface_mux.c,v 1.2 2004/12/21 12:08:38 starvik Exp $
4 */
5
6
7/* C.f. ETRAX100LX Designer's Reference 20.9 */
8
9#include <linux/kernel.h>
10#include <linux/slab.h>
11#include <linux/errno.h>
12#include <linux/module.h>
13#include <linux/init.h>
14
15#include <asm/arch/svinto.h>
16#include <asm/io.h>
17#include <asm/arch/io_interface_mux.h>
18
19
20#define DBG(s)
21
22/* Macro to access ETRAX 100 registers */
23#define SETS(var, reg, field, val) var = (var & ~IO_MASK_(reg##_, field##_)) | \
24 IO_STATE_(reg##_, field##_, _##val)
25
26enum io_if_group {
27 group_a = (1<<0),
28 group_b = (1<<1),
29 group_c = (1<<2),
30 group_d = (1<<3),
31 group_e = (1<<4),
32 group_f = (1<<5)
33};
34
35struct watcher
36{
37 void (*notify)(const unsigned int gpio_in_available,
38 const unsigned int gpio_out_available,
39 const unsigned char pa_available,
40 const unsigned char pb_available);
41 struct watcher *next;
42};
43
44
45struct if_group
46{
47 enum io_if_group group;
48 unsigned char used;
49 enum cris_io_interface owner;
50};
51
52
53struct interface
54{
55 enum cris_io_interface ioif;
56 unsigned char groups;
57 unsigned char used;
58 char *owner;
59 unsigned int gpio_g_in;
60 unsigned int gpio_g_out;
61 unsigned char gpio_b;
62};
63
64static struct if_group if_groups[6] = {
65 {
66 .group = group_a,
67 .used = 0,
68 },
69 {
70 .group = group_b,
71 .used = 0,
72 },
73 {
74 .group = group_c,
75 .used = 0,
76 },
77 {
78 .group = group_d,
79 .used = 0,
80 },
81 {
82 .group = group_e,
83 .used = 0,
84 },
85 {
86 .group = group_f,
87 .used = 0,
88 }
89};
90
91/* The order in the array must match the order of enum
92 * cris_io_interface in io_interface_mux.h */
93static struct interface interfaces[] = {
94 /* Begin Non-multiplexed interfaces */
95 {
96 .ioif = if_eth,
97 .groups = 0,
98 .gpio_g_in = 0,
99 .gpio_g_out = 0,
100 .gpio_b = 0
101 },
102 {
103 .ioif = if_serial_0,
104 .groups = 0,
105 .gpio_g_in = 0,
106 .gpio_g_out = 0,
107 .gpio_b = 0
108 },
109 /* End Non-multiplexed interfaces */
110 {
111 .ioif = if_serial_1,
112 .groups = group_e,
113 .gpio_g_in = 0x00000000,
114 .gpio_g_out = 0x00000000,
115 .gpio_b = 0x00
116 },
117 {
118 .ioif = if_serial_2,
119 .groups = group_b,
120 .gpio_g_in = 0x000000c0,
121 .gpio_g_out = 0x000000c0,
122 .gpio_b = 0x00
123 },
124 {
125 .ioif = if_serial_3,
126 .groups = group_c,
127 .gpio_g_in = 0xc0000000,
128 .gpio_g_out = 0xc0000000,
129 .gpio_b = 0x00
130 },
131 {
132 .ioif = if_sync_serial_1,
133 .groups = group_e | group_f, /* if_sync_serial_1 and if_sync_serial_3
134 can be used simultaneously */
135 .gpio_g_in = 0x00000000,
136 .gpio_g_out = 0x00000000,
137 .gpio_b = 0x10
138 },
139 {
140 .ioif = if_sync_serial_3,
141 .groups = group_c | group_f,
142 .gpio_g_in = 0xc0000000,
143 .gpio_g_out = 0xc0000000,
144 .gpio_b = 0x80
145 },
146 {
147 .ioif = if_shared_ram,
148 .groups = group_a,
149 .gpio_g_in = 0x0000ff3e,
150 .gpio_g_out = 0x0000ff38,
151 .gpio_b = 0x00
152 },
153 {
154 .ioif = if_shared_ram_w,
155 .groups = group_a | group_d,
156 .gpio_g_in = 0x00ffff3e,
157 .gpio_g_out = 0x00ffff38,
158 .gpio_b = 0x00
159 },
160 {
161 .ioif = if_par_0,
162 .groups = group_a,
163 .gpio_g_in = 0x0000ff3e,
164 .gpio_g_out = 0x0000ff3e,
165 .gpio_b = 0x00
166 },
167 {
168 .ioif = if_par_1,
169 .groups = group_d,
170 .gpio_g_in = 0x3eff0000,
171 .gpio_g_out = 0x3eff0000,
172 .gpio_b = 0x00
173 },
174 {
175 .ioif = if_par_w,
176 .groups = group_a | group_d,
177 .gpio_g_in = 0x00ffff3e,
178 .gpio_g_out = 0x00ffff3e,
179 .gpio_b = 0x00
180 },
181 {
182 .ioif = if_scsi8_0,
183 .groups = group_a | group_b | group_f, /* if_scsi8_0 and if_scsi8_1
184 can be used simultaneously */
185 .gpio_g_in = 0x0000ffff,
186 .gpio_g_out = 0x0000ffff,
187 .gpio_b = 0x10
188 },
189 {
190 .ioif = if_scsi8_1,
191 .groups = group_c | group_d | group_f, /* if_scsi8_0 and if_scsi8_1
192 can be used simultaneously */
193 .gpio_g_in = 0xffff0000,
194 .gpio_g_out = 0xffff0000,
195 .gpio_b = 0x80
196 },
197 {
198 .ioif = if_scsi_w,
199 .groups = group_a | group_b | group_d | group_f,
200 .gpio_g_in = 0x01ffffff,
201 .gpio_g_out = 0x07ffffff,
202 .gpio_b = 0x80
203 },
204 {
205 .ioif = if_ata,
206 .groups = group_a | group_b | group_c | group_d,
207 .gpio_g_in = 0xf9ffffff,
208 .gpio_g_out = 0xffffffff,
209 .gpio_b = 0x80
210 },
211 {
212 .ioif = if_csp,
213 .groups = group_f, /* if_csp and if_i2c can be used simultaneously */
214 .gpio_g_in = 0x00000000,
215 .gpio_g_out = 0x00000000,
216 .gpio_b = 0xfc
217 },
218 {
219 .ioif = if_i2c,
220 .groups = group_f, /* if_csp and if_i2c can be used simultaneously */
221 .gpio_g_in = 0x00000000,
222 .gpio_g_out = 0x00000000,
223 .gpio_b = 0x03
224 },
225 {
226 .ioif = if_usb_1,
227 .groups = group_e | group_f,
228 .gpio_g_in = 0x00000000,
229 .gpio_g_out = 0x00000000,
230 .gpio_b = 0x2c
231 },
232 {
233 .ioif = if_usb_2,
234 .groups = group_d,
235 .gpio_g_in = 0x0e000000,
236 .gpio_g_out = 0x3c000000,
237 .gpio_b = 0x00
238 },
239 /* GPIO pins */
240 {
241 .ioif = if_gpio_grp_a,
242 .groups = group_a,
243 .gpio_g_in = 0x0000ff3f,
244 .gpio_g_out = 0x0000ff3f,
245 .gpio_b = 0x00
246 },
247 {
248 .ioif = if_gpio_grp_b,
249 .groups = group_b,
250 .gpio_g_in = 0x000000c0,
251 .gpio_g_out = 0x000000c0,
252 .gpio_b = 0x00
253 },
254 {
255 .ioif = if_gpio_grp_c,
256 .groups = group_c,
257 .gpio_g_in = 0xc0000000,
258 .gpio_g_out = 0xc0000000,
259 .gpio_b = 0x00
260 },
261 {
262 .ioif = if_gpio_grp_d,
263 .groups = group_d,
264 .gpio_g_in = 0x3fff0000,
265 .gpio_g_out = 0x3fff0000,
266 .gpio_b = 0x00
267 },
268 {
269 .ioif = if_gpio_grp_e,
270 .groups = group_e,
271 .gpio_g_in = 0x00000000,
272 .gpio_g_out = 0x00000000,
273 .gpio_b = 0x00
274 },
275 {
276 .ioif = if_gpio_grp_f,
277 .groups = group_f,
278 .gpio_g_in = 0x00000000,
279 .gpio_g_out = 0x00000000,
280 .gpio_b = 0xff
281 }
282 /* Array end */
283};
284
285static struct watcher *watchers = NULL;
286
287static unsigned int gpio_in_pins = 0xffffffff;
288static unsigned int gpio_out_pins = 0xffffffff;
289static unsigned char gpio_pb_pins = 0xff;
290static unsigned char gpio_pa_pins = 0xff;
291
292static enum cris_io_interface gpio_pa_owners[8];
293static enum cris_io_interface gpio_pb_owners[8];
294static enum cris_io_interface gpio_pg_owners[32];
295
296static int cris_io_interface_init(void);
297
298static unsigned char clear_group_from_set(const unsigned char groups, struct if_group *group)
299{
300 return (groups & ~group->group);
301}
302
303
304static struct if_group *get_group(const unsigned char groups)
305{
306 int i;
307 for (i = 0; i < sizeof(if_groups)/sizeof(struct if_group); i++) {
308 if (groups & if_groups[i].group) {
309 return &if_groups[i];
310 }
311 }
312 return NULL;
313}
314
315
316static void notify_watchers(void)
317{
318 struct watcher *w = watchers;
319
320 DBG(printk("io_interface_mux: notifying watchers\n"));
321
322 while (NULL != w) {
323 w->notify((const unsigned int)gpio_in_pins,
324 (const unsigned int)gpio_out_pins,
325 (const unsigned char)gpio_pa_pins,
326 (const unsigned char)gpio_pb_pins);
327 w = w->next;
328 }
329}
330
331
332int cris_request_io_interface(enum cris_io_interface ioif, const char *device_id)
333{
334 int set_gen_config = 0;
335 int set_gen_config_ii = 0;
336 unsigned long int gens;
337 unsigned long int gens_ii;
338 struct if_group *grp;
339 unsigned char group_set;
340 unsigned long flags;
341
342 (void)cris_io_interface_init();
343
344 DBG(printk("cris_request_io_interface(%d, \"%s\")\n", ioif, device_id));
345
346 if ((ioif >= if_max_interfaces) || (ioif < 0)) {
347 printk(KERN_CRIT "cris_request_io_interface: Bad interface %u submitted for %s\n",
348 ioif,
349 device_id);
350 return -EINVAL;
351 }
352
353 local_irq_save(flags);
354
355 if (interfaces[ioif].used) {
356 local_irq_restore(flags);
357 printk(KERN_CRIT "cris_io_interface: Cannot allocate interface for %s, in use by %s\n",
358 device_id,
359 interfaces[ioif].owner);
360 return -EBUSY;
361 }
362
363 /* Check that all required groups are free before allocating, */
364 group_set = interfaces[ioif].groups;
365 while (NULL != (grp = get_group(group_set))) {
366 if (grp->used) {
367 if (grp->group == group_f) {
368 if ((if_sync_serial_1 == ioif) ||
369 (if_sync_serial_3 == ioif)) {
370 if ((grp->owner != if_sync_serial_1) &&
371 (grp->owner != if_sync_serial_3)) {
372 local_irq_restore(flags);
373 return -EBUSY;
374 }
375 } else if ((if_scsi8_0 == ioif) ||
376 (if_scsi8_1 == ioif)) {
377 if ((grp->owner != if_scsi8_0) &&
378 (grp->owner != if_scsi8_1)) {
379 local_irq_restore(flags);
380 return -EBUSY;
381 }
382 }
383 } else {
384 local_irq_restore(flags);
385 return -EBUSY;
386 }
387 }
388 group_set = clear_group_from_set(group_set, grp);
389 }
390
391 /* Are the required GPIO pins available too? */
392 if (((interfaces[ioif].gpio_g_in & gpio_in_pins) != interfaces[ioif].gpio_g_in) ||
393 ((interfaces[ioif].gpio_g_out & gpio_out_pins) != interfaces[ioif].gpio_g_out) ||
394 ((interfaces[ioif].gpio_b & gpio_pb_pins) != interfaces[ioif].gpio_b)) {
395 printk(KERN_CRIT "cris_request_io_interface: Could not get required pins for interface %u\n",
396 ioif);
397 return -EBUSY;
398 }
399
400 /* All needed I/O pins and pin groups are free, allocate. */
401 group_set = interfaces[ioif].groups;
402 while (NULL != (grp = get_group(group_set))) {
403 grp->used = 1;
404 grp->owner = ioif;
405 group_set = clear_group_from_set(group_set, grp);
406 }
407
408 gens = genconfig_shadow;
409 gens_ii = gen_config_ii_shadow;
410
411 set_gen_config = 1;
412 switch (ioif)
413 {
414 /* Begin Non-multiplexed interfaces */
415 case if_eth:
416 /* fall through */
417 case if_serial_0:
418 set_gen_config = 0;
419 break;
420 /* End Non-multiplexed interfaces */
421 case if_serial_1:
422 set_gen_config_ii = 1;
423 SETS(gens_ii, R_GEN_CONFIG_II, sermode1, async);
424 break;
425 case if_serial_2:
426 SETS(gens, R_GEN_CONFIG, ser2, select);
427 break;
428 case if_serial_3:
429 SETS(gens, R_GEN_CONFIG, ser3, select);
430 set_gen_config_ii = 1;
431 SETS(gens_ii, R_GEN_CONFIG_II, sermode3, async);
432 break;
433 case if_sync_serial_1:
434 set_gen_config_ii = 1;
435 SETS(gens_ii, R_GEN_CONFIG_II, sermode1, sync);
436 break;
437 case if_sync_serial_3:
438 SETS(gens, R_GEN_CONFIG, ser3, select);
439 set_gen_config_ii = 1;
440 SETS(gens_ii, R_GEN_CONFIG_II, sermode3, sync);
441 break;
442 case if_shared_ram:
443 SETS(gens, R_GEN_CONFIG, mio, select);
444 break;
445 case if_shared_ram_w:
446 SETS(gens, R_GEN_CONFIG, mio_w, select);
447 break;
448 case if_par_0:
449 SETS(gens, R_GEN_CONFIG, par0, select);
450 break;
451 case if_par_1:
452 SETS(gens, R_GEN_CONFIG, par1, select);
453 break;
454 case if_par_w:
455 SETS(gens, R_GEN_CONFIG, par0, select);
456 SETS(gens, R_GEN_CONFIG, par_w, select);
457 break;
458 case if_scsi8_0:
459 SETS(gens, R_GEN_CONFIG, scsi0, select);
460 break;
461 case if_scsi8_1:
462 SETS(gens, R_GEN_CONFIG, scsi1, select);
463 break;
464 case if_scsi_w:
465 SETS(gens, R_GEN_CONFIG, scsi0, select);
466 SETS(gens, R_GEN_CONFIG, scsi0w, select);
467 break;
468 case if_ata:
469 SETS(gens, R_GEN_CONFIG, ata, select);
470 break;
471 case if_csp:
472 /* fall through */
473 case if_i2c:
474 set_gen_config = 0;
475 break;
476 case if_usb_1:
477 SETS(gens, R_GEN_CONFIG, usb1, select);
478 break;
479 case if_usb_2:
480 SETS(gens, R_GEN_CONFIG, usb2, select);
481 break;
482 case if_gpio_grp_a:
483 /* GPIO groups are only accounted, don't do configuration changes. */
484 /* fall through */
485 case if_gpio_grp_b:
486 /* fall through */
487 case if_gpio_grp_c:
488 /* fall through */
489 case if_gpio_grp_d:
490 /* fall through */
491 case if_gpio_grp_e:
492 /* fall through */
493 case if_gpio_grp_f:
494 set_gen_config = 0;
495 break;
496 default:
497 panic("cris_request_io_interface: Bad interface %u submitted for %s\n",
498 ioif,
499 device_id);
500 }
501
502 interfaces[ioif].used = 1;
503 interfaces[ioif].owner = (char*)device_id;
504
505 if (set_gen_config) {
506 volatile int i;
507 genconfig_shadow = gens;
508 *R_GEN_CONFIG = genconfig_shadow;
509 /* Wait 12 cycles before doing any DMA command */
510 for(i = 6; i > 0; i--)
511 nop();
512 }
513 if (set_gen_config_ii) {
514 gen_config_ii_shadow = gens_ii;
515 *R_GEN_CONFIG_II = gen_config_ii_shadow;
516 }
517
518 DBG(printk("GPIO pins: available before: g_in=0x%08x g_out=0x%08x pb=0x%02x\n",
519 gpio_in_pins, gpio_out_pins, gpio_pb_pins));
520 DBG(printk("grabbing pins: g_in=0x%08x g_out=0x%08x pb=0x%02x\n",
521 interfaces[ioif].gpio_g_in,
522 interfaces[ioif].gpio_g_out,
523 interfaces[ioif].gpio_b));
524
525 gpio_in_pins &= ~interfaces[ioif].gpio_g_in;
526 gpio_out_pins &= ~interfaces[ioif].gpio_g_out;
527 gpio_pb_pins &= ~interfaces[ioif].gpio_b;
528
529 DBG(printk("GPIO pins: available after: g_in=0x%08x g_out=0x%08x pb=0x%02x\n",
530 gpio_in_pins, gpio_out_pins, gpio_pb_pins));
531
532 local_irq_restore(flags);
533
534 notify_watchers();
535
536 return 0;
537}
538
539
540void cris_free_io_interface(enum cris_io_interface ioif)
541{
542 struct if_group *grp;
543 unsigned char group_set;
544 unsigned long flags;
545
546 (void)cris_io_interface_init();
547
548 if ((ioif >= if_max_interfaces) || (ioif < 0)) {
549 printk(KERN_CRIT "cris_free_io_interface: Bad interface %u\n",
550 ioif);
551 return;
552 }
553 local_irq_save(flags);
554 if (!interfaces[ioif].used) {
555 printk(KERN_CRIT "cris_free_io_interface: Freeing free interface %u\n",
556 ioif);
557 local_irq_restore(flags);
558 return;
559 }
560 group_set = interfaces[ioif].groups;
561 while (NULL != (grp = get_group(group_set))) {
562 if (grp->group == group_f) {
563 switch (ioif)
564 {
565 case if_sync_serial_1:
566 if ((grp->owner == if_sync_serial_1) &&
567 interfaces[if_sync_serial_3].used) {
568 grp->owner = if_sync_serial_3;
569 } else
570 grp->used = 0;
571 break;
572 case if_sync_serial_3:
573 if ((grp->owner == if_sync_serial_3) &&
574 interfaces[if_sync_serial_1].used) {
575 grp->owner = if_sync_serial_1;
576 } else
577 grp->used = 0;
578 break;
579 case if_scsi8_0:
580 if ((grp->owner == if_scsi8_0) &&
581 interfaces[if_scsi8_1].used) {
582 grp->owner = if_scsi8_1;
583 } else
584 grp->used = 0;
585 break;
586 case if_scsi8_1:
587 if ((grp->owner == if_scsi8_1) &&
588 interfaces[if_scsi8_0].used) {
589 grp->owner = if_scsi8_0;
590 } else
591 grp->used = 0;
592 break;
593 default:
594 grp->used = 0;
595 }
596 } else {
597 grp->used = 0;
598 }
599 group_set = clear_group_from_set(group_set, grp);
600 }
601 interfaces[ioif].used = 0;
602 interfaces[ioif].owner = NULL;
603
604 DBG(printk("GPIO pins: available before: g_in=0x%08x g_out=0x%08x pb=0x%02x\n",
605 gpio_in_pins, gpio_out_pins, gpio_pb_pins));
606 DBG(printk("freeing pins: g_in=0x%08x g_out=0x%08x pb=0x%02x\n",
607 interfaces[ioif].gpio_g_in,
608 interfaces[ioif].gpio_g_out,
609 interfaces[ioif].gpio_b));
610
611 gpio_in_pins |= interfaces[ioif].gpio_g_in;
612 gpio_out_pins |= interfaces[ioif].gpio_g_out;
613 gpio_pb_pins |= interfaces[ioif].gpio_b;
614
615 DBG(printk("GPIO pins: available after: g_in=0x%08x g_out=0x%08x pb=0x%02x\n",
616 gpio_in_pins, gpio_out_pins, gpio_pb_pins));
617
618 local_irq_restore(flags);
619
620 notify_watchers();
621}
622
623/* Create a bitmask from bit 0 (inclusive) to bit stop_bit
624 (non-inclusive). stop_bit == 0 returns 0x0 */
625static inline unsigned int create_mask(const unsigned stop_bit)
626{
627 /* Avoid overflow */
628 if (stop_bit >= 32) {
629 return 0xffffffff;
630 }
631 return (1<<stop_bit)-1;
632}
633
634
635/* port can be 'a', 'b' or 'g' */
636int cris_io_interface_allocate_pins(const enum cris_io_interface ioif,
637 const char port,
638 const unsigned start_bit,
639 const unsigned stop_bit)
640{
641 unsigned int i;
642 unsigned int mask = 0;
643 unsigned int tmp_mask;
644 unsigned long int flags;
645 enum cris_io_interface *owners;
646
647 (void)cris_io_interface_init();
648
649 DBG(printk("cris_io_interface_allocate_pins: if=%d port=%c start=%u stop=%u\n",
650 ioif, port, start_bit, stop_bit));
651
652 if (!((start_bit <= stop_bit) &&
653 ((((port == 'a') || (port == 'b')) && (stop_bit < 8)) ||
654 ((port == 'g') && (stop_bit < 32))))) {
655 return -EINVAL;
656 }
657
658 mask = create_mask(stop_bit + 1);
659 tmp_mask = create_mask(start_bit);
660 mask &= ~tmp_mask;
661
662 DBG(printk("cris_io_interface_allocate_pins: port=%c start=%u stop=%u mask=0x%08x\n",
663 port, start_bit, stop_bit, mask));
664
665 local_irq_save(flags);
666
667 switch (port) {
668 case 'a':
669 if ((gpio_pa_pins & mask) != mask) {
670 local_irq_restore(flags);
671 return -EBUSY;
672 }
673 owners = gpio_pa_owners;
674 gpio_pa_pins &= ~mask;
675 break;
676 case 'b':
677 if ((gpio_pb_pins & mask) != mask) {
678 local_irq_restore(flags);
679 return -EBUSY;
680 }
681 owners = gpio_pb_owners;
682 gpio_pb_pins &= ~mask;
683 break;
684 case 'g':
685 if (((gpio_in_pins & mask) != mask) ||
686 ((gpio_out_pins & mask) != mask)) {
687 local_irq_restore(flags);
688 return -EBUSY;
689 }
690 owners = gpio_pg_owners;
691 gpio_in_pins &= ~mask;
692 gpio_out_pins &= ~mask;
693 break;
694 default:
695 local_irq_restore(flags);
696 return -EINVAL;
697 }
698
699 for (i = start_bit; i <= stop_bit; i++) {
700 owners[i] = ioif;
701 }
702 local_irq_restore(flags);
703
704 notify_watchers();
705 return 0;
706}
707
708
709/* port can be 'a', 'b' or 'g' */
710int cris_io_interface_free_pins(const enum cris_io_interface ioif,
711 const char port,
712 const unsigned start_bit,
713 const unsigned stop_bit)
714{
715 unsigned int i;
716 unsigned int mask = 0;
717 unsigned int tmp_mask;
718 unsigned long int flags;
719 enum cris_io_interface *owners;
720
721 (void)cris_io_interface_init();
722
723 if (!((start_bit <= stop_bit) &&
724 ((((port == 'a') || (port == 'b')) && (stop_bit < 8)) ||
725 ((port == 'g') && (stop_bit < 32))))) {
726 return -EINVAL;
727 }
728
729 mask = create_mask(stop_bit + 1);
730 tmp_mask = create_mask(start_bit);
731 mask &= ~tmp_mask;
732
733 DBG(printk("cris_io_interface_free_pins: port=%c start=%u stop=%u mask=0x%08x\n",
734 port, start_bit, stop_bit, mask));
735
736 local_irq_save(flags);
737
738 switch (port) {
739 case 'a':
740 if ((~gpio_pa_pins & mask) != mask) {
741 local_irq_restore(flags);
742 printk(KERN_CRIT "cris_io_interface_free_pins: Freeing free pins");
743 }
744 owners = gpio_pa_owners;
745 break;
746 case 'b':
747 if ((~gpio_pb_pins & mask) != mask) {
748 local_irq_restore(flags);
749 printk(KERN_CRIT "cris_io_interface_free_pins: Freeing free pins");
750 }
751 owners = gpio_pb_owners;
752 break;
753 case 'g':
754 if (((~gpio_in_pins & mask) != mask) ||
755 ((~gpio_out_pins & mask) != mask)) {
756 local_irq_restore(flags);
757 printk(KERN_CRIT "cris_io_interface_free_pins: Freeing free pins");
758 }
759 owners = gpio_pg_owners;
760 break;
761 default:
762 owners = NULL; /* Cannot happen. Shut up, gcc! */
763 }
764
765 for (i = start_bit; i <= stop_bit; i++) {
766 if (owners[i] != ioif) {
767 printk(KERN_CRIT "cris_io_interface_free_pins: Freeing unowned pins");
768 }
769 }
770
771 /* All was ok, change data. */
772 switch (port) {
773 case 'a':
774 gpio_pa_pins |= mask;
775 break;
776 case 'b':
777 gpio_pb_pins |= mask;
778 break;
779 case 'g':
780 gpio_in_pins |= mask;
781 gpio_out_pins |= mask;
782 break;
783 }
784
785 for (i = start_bit; i <= stop_bit; i++) {
786 owners[i] = if_unclaimed;
787 }
788 local_irq_restore(flags);
789 notify_watchers();
790
791 return 0;
792}
793
794
795int cris_io_interface_register_watcher(void (*notify)(const unsigned int gpio_in_available,
796 const unsigned int gpio_out_available,
797 const unsigned char pa_available,
798 const unsigned char pb_available))
799{
800 struct watcher *w;
801
802 (void)cris_io_interface_init();
803
804 if (NULL == notify) {
805 return -EINVAL;
806 }
807 w = kmalloc(sizeof(*w), GFP_KERNEL);
808 if (!w) {
809 return -ENOMEM;
810 }
811 w->notify = notify;
812 w->next = watchers;
813 watchers = w;
814
815 w->notify((const unsigned int)gpio_in_pins,
816 (const unsigned int)gpio_out_pins,
817 (const unsigned char)gpio_pa_pins,
818 (const unsigned char)gpio_pb_pins);
819
820 return 0;
821}
822
823void cris_io_interface_delete_watcher(void (*notify)(const unsigned int gpio_in_available,
824 const unsigned int gpio_out_available,
825 const unsigned char pa_available,
826 const unsigned char pb_available))
827{
828 struct watcher *w = watchers, *prev = NULL;
829
830 (void)cris_io_interface_init();
831
832 while ((NULL != w) && (w->notify != notify)){
833 prev = w;
834 w = w->next;
835 }
836 if (NULL != w) {
837 if (NULL != prev) {
838 prev->next = w->next;
839 } else {
840 watchers = w->next;
841 }
842 kfree(w);
843 return;
844 }
845 printk(KERN_WARNING "cris_io_interface_delete_watcher: Deleting unknown watcher 0x%p\n", notify);
846}
847
848
849static int cris_io_interface_init(void)
850{
851 static int first = 1;
852 int i;
853
854 if (!first) {
855 return 0;
856 }
857 first = 0;
858
859 for (i = 0; i<8; i++) {
860 gpio_pa_owners[i] = if_unclaimed;
861 gpio_pb_owners[i] = if_unclaimed;
862 gpio_pg_owners[i] = if_unclaimed;
863 }
864 for (; i<32; i++) {
865 gpio_pg_owners[i] = if_unclaimed;
866 }
867 return 0;
868}
869
870
871module_init(cris_io_interface_init);
872
873
874EXPORT_SYMBOL(cris_request_io_interface);
875EXPORT_SYMBOL(cris_free_io_interface);
876EXPORT_SYMBOL(cris_io_interface_allocate_pins);
877EXPORT_SYMBOL(cris_io_interface_free_pins);
878EXPORT_SYMBOL(cris_io_interface_register_watcher);
879EXPORT_SYMBOL(cris_io_interface_delete_watcher);
diff --git a/arch/cris/arch-v10/kernel/shadows.c b/arch/cris/arch-v10/kernel/shadows.c
index 561a890a8e4c..38fd44dfbc5b 100644
--- a/arch/cris/arch-v10/kernel/shadows.c
+++ b/arch/cris/arch-v10/kernel/shadows.c
@@ -1,4 +1,4 @@
1/* $Id: shadows.c,v 1.1 2001/12/17 13:59:27 bjornw Exp $ 1/* $Id: shadows.c,v 1.2 2004/12/13 12:21:51 starvik Exp $
2 * 2 *
3 * Various shadow registers. Defines for these are in include/asm-etrax100/io.h 3 * Various shadow registers. Defines for these are in include/asm-etrax100/io.h
4 */ 4 */
@@ -6,6 +6,7 @@
6/* Shadows for internal Etrax-registers */ 6/* Shadows for internal Etrax-registers */
7 7
8unsigned long genconfig_shadow; 8unsigned long genconfig_shadow;
9unsigned long gen_config_ii_shadow;
9unsigned long port_g_data_shadow; 10unsigned long port_g_data_shadow;
10unsigned char port_pa_dir_shadow; 11unsigned char port_pa_dir_shadow;
11unsigned char port_pa_data_shadow; 12unsigned char port_pa_data_shadow;
generated by cgit v1.2.2 (git 2.25.0) at 2024-11-14 19:07:44 -0500