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Linux 2.6.21-rc3
[linux/fpc-iii.git] / drivers / serial / mpsc.c
blob3d2fcc57b1ced216ec9d6702f5c10a73edd8631f
1 /*
2 * Generic driver for the MPSC (UART mode) on Marvell parts (e.g., GT64240,
3 * GT64260, MV64340, MV64360, GT96100, ... ).
4 *
5 * Author: Mark A. Greer <mgreer@mvista.com>
6 *
7 * Based on an old MPSC driver that was in the linuxppc tree. It appears to
8 * have been created by Chris Zankel (formerly of MontaVista) but there
9 * is no proper Copyright so I'm not sure. Apparently, parts were also
10 * taken from PPCBoot (now U-Boot). Also based on drivers/serial/8250.c
11 * by Russell King.
12 *
13 * 2004 (c) MontaVista, Software, Inc. This file is licensed under
14 * the terms of the GNU General Public License version 2. This program
15 * is licensed "as is" without any warranty of any kind, whether express
16 * or implied.
17 */
18 /*
19 * The MPSC interface is much like a typical network controller's interface.
20 * That is, you set up separate rings of descriptors for transmitting and
21 * receiving data. There is also a pool of buffers with (one buffer per
22 * descriptor) that incoming data are dma'd into or outgoing data are dma'd
23 * out of.
24 *
25 * The MPSC requires two other controllers to be able to work. The Baud Rate
26 * Generator (BRG) provides a clock at programmable frequencies which determines
27 * the baud rate. The Serial DMA Controller (SDMA) takes incoming data from the
28 * MPSC and DMA's it into memory or DMA's outgoing data and passes it to the
29 * MPSC. It is actually the SDMA interrupt that the driver uses to keep the
30 * transmit and receive "engines" going (i.e., indicate data has been
31 * transmitted or received).
32 *
33 * NOTES:
34 *
35 * 1) Some chips have an erratum where several regs cannot be
36 * read. To work around that, we keep a local copy of those regs in
37 * 'mpsc_port_info'.
38 *
39 * 2) Some chips have an erratum where the ctlr will hang when the SDMA ctlr
40 * accesses system mem with coherency enabled. For that reason, the driver
41 * assumes that coherency for that ctlr has been disabled. This means
42 * that when in a cache coherent system, the driver has to manually manage
43 * the data cache on the areas that it touches because the dma_* macro are
44 * basically no-ops.
45 *
46 * 3) There is an erratum (on PPC) where you can't use the instruction to do
47 * a DMA_TO_DEVICE/cache clean so DMA_BIDIRECTIONAL/flushes are used in places
48 * where a DMA_TO_DEVICE/clean would have [otherwise] sufficed.
49 *
50 * 4) AFAICT, hardware flow control isn't supported by the controller --MAG.
51 */
52
53
54 #if defined(CONFIG_SERIAL_MPSC_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
55 #define SUPPORT_SYSRQ
56 #endif
57
58 #include <linux/module.h>
59 #include <linux/moduleparam.h>
60 #include <linux/tty.h>
61 #include <linux/tty_flip.h>
62 #include <linux/ioport.h>
63 #include <linux/init.h>
64 #include <linux/console.h>
65 #include <linux/sysrq.h>
66 #include <linux/serial.h>
67 #include <linux/serial_core.h>
68 #include <linux/delay.h>
69 #include <linux/device.h>
70 #include <linux/dma-mapping.h>
71 #include <linux/mv643xx.h>
72 #include <linux/platform_device.h>
73
74 #include <asm/io.h>
75 #include <asm/irq.h>
76
77 #if defined(CONFIG_SERIAL_MPSC_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
78 #define SUPPORT_SYSRQ
79 #endif
80
81 #define MPSC_NUM_CTLRS 2
82
83 /*
84 * Descriptors and buffers must be cache line aligned.
85 * Buffers lengths must be multiple of cache line size.
86 * Number of Tx & Rx descriptors must be powers of 2.
87 */
88 #define MPSC_RXR_ENTRIES 32
89 #define MPSC_RXRE_SIZE dma_get_cache_alignment()
90 #define MPSC_RXR_SIZE (MPSC_RXR_ENTRIES * MPSC_RXRE_SIZE)
91 #define MPSC_RXBE_SIZE dma_get_cache_alignment()
92 #define MPSC_RXB_SIZE (MPSC_RXR_ENTRIES * MPSC_RXBE_SIZE)
93
94 #define MPSC_TXR_ENTRIES 32
95 #define MPSC_TXRE_SIZE dma_get_cache_alignment()
96 #define MPSC_TXR_SIZE (MPSC_TXR_ENTRIES * MPSC_TXRE_SIZE)
97 #define MPSC_TXBE_SIZE dma_get_cache_alignment()
98 #define MPSC_TXB_SIZE (MPSC_TXR_ENTRIES * MPSC_TXBE_SIZE)
99
100 #define MPSC_DMA_ALLOC_SIZE (MPSC_RXR_SIZE + MPSC_RXB_SIZE + \
101 MPSC_TXR_SIZE + MPSC_TXB_SIZE + \
102 dma_get_cache_alignment() /* for alignment */)
103
104 /* Rx and Tx Ring entry descriptors -- assume entry size is <= cacheline size */
105 struct mpsc_rx_desc {
106 u16 bufsize;
107 u16 bytecnt;
108 u32 cmdstat;
109 u32 link;
110 u32 buf_ptr;
111 } __attribute((packed));
112
113 struct mpsc_tx_desc {
114 u16 bytecnt;
115 u16 shadow;
116 u32 cmdstat;
117 u32 link;
118 u32 buf_ptr;
119 } __attribute((packed));
120
121 /*
122 * Some regs that have the erratum that you can't read them are are shared
123 * between the two MPSC controllers. This struct contains those shared regs.
124 */
125 struct mpsc_shared_regs {
126 phys_addr_t mpsc_routing_base_p;
127 phys_addr_t sdma_intr_base_p;
128
129 void __iomem *mpsc_routing_base;
130 void __iomem *sdma_intr_base;
131
132 u32 MPSC_MRR_m;
133 u32 MPSC_RCRR_m;
134 u32 MPSC_TCRR_m;
135 u32 SDMA_INTR_CAUSE_m;
136 u32 SDMA_INTR_MASK_m;
137 };
138
139 /* The main driver data structure */
140 struct mpsc_port_info {
141 struct uart_port port; /* Overlay uart_port structure */
142
143 /* Internal driver state for this ctlr */
144 u8 ready;
145 u8 rcv_data;
146 tcflag_t c_iflag; /* save termios->c_iflag */
147 tcflag_t c_cflag; /* save termios->c_cflag */
148
149 /* Info passed in from platform */
150 u8 mirror_regs; /* Need to mirror regs? */
151 u8 cache_mgmt; /* Need manual cache mgmt? */
152 u8 brg_can_tune; /* BRG has baud tuning? */
153 u32 brg_clk_src;
154 u16 mpsc_max_idle;
155 int default_baud;
156 int default_bits;
157 int default_parity;
158 int default_flow;
159
160 /* Physical addresses of various blocks of registers (from platform) */
161 phys_addr_t mpsc_base_p;
162 phys_addr_t sdma_base_p;
163 phys_addr_t brg_base_p;
164
165 /* Virtual addresses of various blocks of registers (from platform) */
166 void __iomem *mpsc_base;
167 void __iomem *sdma_base;
168 void __iomem *brg_base;
169
170 /* Descriptor ring and buffer allocations */
171 void *dma_region;
172 dma_addr_t dma_region_p;
173
174 dma_addr_t rxr; /* Rx descriptor ring */
175 dma_addr_t rxr_p; /* Phys addr of rxr */
176 u8 *rxb; /* Rx Ring I/O buf */
177 u8 *rxb_p; /* Phys addr of rxb */
178 u32 rxr_posn; /* First desc w/ Rx data */
179
180 dma_addr_t txr; /* Tx descriptor ring */
181 dma_addr_t txr_p; /* Phys addr of txr */
182 u8 *txb; /* Tx Ring I/O buf */
183 u8 *txb_p; /* Phys addr of txb */
184 int txr_head; /* Where new data goes */
185 int txr_tail; /* Where sent data comes off */
186
187 /* Mirrored values of regs we can't read (if 'mirror_regs' set) */
188 u32 MPSC_MPCR_m;
189 u32 MPSC_CHR_1_m;
190 u32 MPSC_CHR_2_m;
191 u32 MPSC_CHR_10_m;
192 u32 BRG_BCR_m;
193 struct mpsc_shared_regs *shared_regs;
194 };
195
196 /* Hooks to platform-specific code */
197 int mpsc_platform_register_driver(void);
198 void mpsc_platform_unregister_driver(void);
199
200 /* Hooks back in to mpsc common to be called by platform-specific code */
201 struct mpsc_port_info *mpsc_device_probe(int index);
202 struct mpsc_port_info *mpsc_device_remove(int index);
203
204 /* Main MPSC Configuration Register Offsets */
205 #define MPSC_MMCRL 0x0000
206 #define MPSC_MMCRH 0x0004
207 #define MPSC_MPCR 0x0008
208 #define MPSC_CHR_1 0x000c
209 #define MPSC_CHR_2 0x0010
210 #define MPSC_CHR_3 0x0014
211 #define MPSC_CHR_4 0x0018
212 #define MPSC_CHR_5 0x001c
213 #define MPSC_CHR_6 0x0020
214 #define MPSC_CHR_7 0x0024
215 #define MPSC_CHR_8 0x0028
216 #define MPSC_CHR_9 0x002c
217 #define MPSC_CHR_10 0x0030
218 #define MPSC_CHR_11 0x0034
219
220 #define MPSC_MPCR_FRZ (1 << 9)
221 #define MPSC_MPCR_CL_5 0
222 #define MPSC_MPCR_CL_6 1
223 #define MPSC_MPCR_CL_7 2
224 #define MPSC_MPCR_CL_8 3
225 #define MPSC_MPCR_SBL_1 0
226 #define MPSC_MPCR_SBL_2 1
227
228 #define MPSC_CHR_2_TEV (1<<1)
229 #define MPSC_CHR_2_TA (1<<7)
230 #define MPSC_CHR_2_TTCS (1<<9)
231 #define MPSC_CHR_2_REV (1<<17)
232 #define MPSC_CHR_2_RA (1<<23)
233 #define MPSC_CHR_2_CRD (1<<25)
234 #define MPSC_CHR_2_EH (1<<31)
235 #define MPSC_CHR_2_PAR_ODD 0
236 #define MPSC_CHR_2_PAR_SPACE 1
237 #define MPSC_CHR_2_PAR_EVEN 2
238 #define MPSC_CHR_2_PAR_MARK 3
239
240 /* MPSC Signal Routing */
241 #define MPSC_MRR 0x0000
242 #define MPSC_RCRR 0x0004
243 #define MPSC_TCRR 0x0008
244
245 /* Serial DMA Controller Interface Registers */
246 #define SDMA_SDC 0x0000
247 #define SDMA_SDCM 0x0008
248 #define SDMA_RX_DESC 0x0800
249 #define SDMA_RX_BUF_PTR 0x0808
250 #define SDMA_SCRDP 0x0810
251 #define SDMA_TX_DESC 0x0c00
252 #define SDMA_SCTDP 0x0c10
253 #define SDMA_SFTDP 0x0c14
254
255 #define SDMA_DESC_CMDSTAT_PE (1<<0)
256 #define SDMA_DESC_CMDSTAT_CDL (1<<1)
257 #define SDMA_DESC_CMDSTAT_FR (1<<3)
258 #define SDMA_DESC_CMDSTAT_OR (1<<6)
259 #define SDMA_DESC_CMDSTAT_BR (1<<9)
260 #define SDMA_DESC_CMDSTAT_MI (1<<10)
261 #define SDMA_DESC_CMDSTAT_A (1<<11)
262 #define SDMA_DESC_CMDSTAT_AM (1<<12)
263 #define SDMA_DESC_CMDSTAT_CT (1<<13)
264 #define SDMA_DESC_CMDSTAT_C (1<<14)
265 #define SDMA_DESC_CMDSTAT_ES (1<<15)
266 #define SDMA_DESC_CMDSTAT_L (1<<16)
267 #define SDMA_DESC_CMDSTAT_F (1<<17)
268 #define SDMA_DESC_CMDSTAT_P (1<<18)
269 #define SDMA_DESC_CMDSTAT_EI (1<<23)
270 #define SDMA_DESC_CMDSTAT_O (1<<31)
271
272 #define SDMA_DESC_DFLT (SDMA_DESC_CMDSTAT_O | \
273 SDMA_DESC_CMDSTAT_EI)
274
275 #define SDMA_SDC_RFT (1<<0)
276 #define SDMA_SDC_SFM (1<<1)
277 #define SDMA_SDC_BLMR (1<<6)
278 #define SDMA_SDC_BLMT (1<<7)
279 #define SDMA_SDC_POVR (1<<8)
280 #define SDMA_SDC_RIFB (1<<9)
281
282 #define SDMA_SDCM_ERD (1<<7)
283 #define SDMA_SDCM_AR (1<<15)
284 #define SDMA_SDCM_STD (1<<16)
285 #define SDMA_SDCM_TXD (1<<23)
286 #define SDMA_SDCM_AT (1<<31)
287
288 #define SDMA_0_CAUSE_RXBUF (1<<0)
289 #define SDMA_0_CAUSE_RXERR (1<<1)
290 #define SDMA_0_CAUSE_TXBUF (1<<2)
291 #define SDMA_0_CAUSE_TXEND (1<<3)
292 #define SDMA_1_CAUSE_RXBUF (1<<8)
293 #define SDMA_1_CAUSE_RXERR (1<<9)
294 #define SDMA_1_CAUSE_TXBUF (1<<10)
295 #define SDMA_1_CAUSE_TXEND (1<<11)
296
297 #define SDMA_CAUSE_RX_MASK (SDMA_0_CAUSE_RXBUF | SDMA_0_CAUSE_RXERR | \
298 SDMA_1_CAUSE_RXBUF | SDMA_1_CAUSE_RXERR)
299 #define SDMA_CAUSE_TX_MASK (SDMA_0_CAUSE_TXBUF | SDMA_0_CAUSE_TXEND | \
300 SDMA_1_CAUSE_TXBUF | SDMA_1_CAUSE_TXEND)
301
302 /* SDMA Interrupt registers */
303 #define SDMA_INTR_CAUSE 0x0000
304 #define SDMA_INTR_MASK 0x0080
305
306 /* Baud Rate Generator Interface Registers */
307 #define BRG_BCR 0x0000
308 #define BRG_BTR 0x0004
309
310 /*
311 * Define how this driver is known to the outside (we've been assigned a
312 * range on the "Low-density serial ports" major).
313 */
314 #define MPSC_MAJOR 204
315 #define MPSC_MINOR_START 44
316 #define MPSC_DRIVER_NAME "MPSC"
317 #define MPSC_DEV_NAME "ttyMM"
318 #define MPSC_VERSION "1.00"
319
320 static struct mpsc_port_info mpsc_ports[MPSC_NUM_CTLRS];
321 static struct mpsc_shared_regs mpsc_shared_regs;
322 static struct uart_driver mpsc_reg;
323
324 static void mpsc_start_rx(struct mpsc_port_info *pi);
325 static void mpsc_free_ring_mem(struct mpsc_port_info *pi);
326 static void mpsc_release_port(struct uart_port *port);
327 /*
328 ******************************************************************************
329 *
330 * Baud Rate Generator Routines (BRG)
331 *
332 ******************************************************************************
333 */
334 static void
335 mpsc_brg_init(struct mpsc_port_info *pi, u32 clk_src)
336 {
337 u32 v;
338
339 v = (pi->mirror_regs) ? pi->BRG_BCR_m : readl(pi->brg_base + BRG_BCR);
340 v = (v & ~(0xf << 18)) | ((clk_src & 0xf) << 18);
341
342 if (pi->brg_can_tune)
343 v &= ~(1 << 25);
344
345 if (pi->mirror_regs)
346 pi->BRG_BCR_m = v;
347 writel(v, pi->brg_base + BRG_BCR);
348
349 writel(readl(pi->brg_base + BRG_BTR) & 0xffff0000,
350 pi->brg_base + BRG_BTR);
351 return;
352 }
353
354 static void
355 mpsc_brg_enable(struct mpsc_port_info *pi)
356 {
357 u32 v;
358
359 v = (pi->mirror_regs) ? pi->BRG_BCR_m : readl(pi->brg_base + BRG_BCR);
360 v |= (1 << 16);
361
362 if (pi->mirror_regs)
363 pi->BRG_BCR_m = v;
364 writel(v, pi->brg_base + BRG_BCR);
365 return;
366 }
367
368 static void
369 mpsc_brg_disable(struct mpsc_port_info *pi)
370 {
371 u32 v;
372
373 v = (pi->mirror_regs) ? pi->BRG_BCR_m : readl(pi->brg_base + BRG_BCR);
374 v &= ~(1 << 16);
375
376 if (pi->mirror_regs)
377 pi->BRG_BCR_m = v;
378 writel(v, pi->brg_base + BRG_BCR);
379 return;
380 }
381
382 static inline void
383 mpsc_set_baudrate(struct mpsc_port_info *pi, u32 baud)
384 {
385 /*
386 * To set the baud, we adjust the CDV field in the BRG_BCR reg.
387 * From manual: Baud = clk / ((CDV+1)*2) ==> CDV = (clk / (baud*2)) - 1.
388 * However, the input clock is divided by 16 in the MPSC b/c of how
389 * 'MPSC_MMCRH' was set up so we have to divide the 'clk' used in our
390 * calculation by 16 to account for that. So the real calculation
391 * that accounts for the way the mpsc is set up is:
392 * CDV = (clk / (baud*2*16)) - 1 ==> CDV = (clk / (baud << 5)) - 1.
393 */
394 u32 cdv = (pi->port.uartclk / (baud << 5)) - 1;
395 u32 v;
396
397 mpsc_brg_disable(pi);
398 v = (pi->mirror_regs) ? pi->BRG_BCR_m : readl(pi->brg_base + BRG_BCR);
399 v = (v & 0xffff0000) | (cdv & 0xffff);
400
401 if (pi->mirror_regs)
402 pi->BRG_BCR_m = v;
403 writel(v, pi->brg_base + BRG_BCR);
404 mpsc_brg_enable(pi);
405
406 return;
407 }
408
409 /*
410 ******************************************************************************
411 *
412 * Serial DMA Routines (SDMA)
413 *
414 ******************************************************************************
415 */
416
417 static void
418 mpsc_sdma_burstsize(struct mpsc_port_info *pi, u32 burst_size)
419 {
420 u32 v;
421
422 pr_debug("mpsc_sdma_burstsize[%d]: burst_size: %d\n",
423 pi->port.line, burst_size);
424
425 burst_size >>= 3; /* Divide by 8 b/c reg values are 8-byte chunks */
426
427 if (burst_size < 2)
428 v = 0x0; /* 1 64-bit word */
429 else if (burst_size < 4)
430 v = 0x1; /* 2 64-bit words */
431 else if (burst_size < 8)
432 v = 0x2; /* 4 64-bit words */
433 else
434 v = 0x3; /* 8 64-bit words */
435
436 writel((readl(pi->sdma_base + SDMA_SDC) & (0x3 << 12)) | (v << 12),
437 pi->sdma_base + SDMA_SDC);
438 return;
439 }
440
441 static void
442 mpsc_sdma_init(struct mpsc_port_info *pi, u32 burst_size)
443 {
444 pr_debug("mpsc_sdma_init[%d]: burst_size: %d\n", pi->port.line,
445 burst_size);
446
447 writel((readl(pi->sdma_base + SDMA_SDC) & 0x3ff) | 0x03f,
448 pi->sdma_base + SDMA_SDC);
449 mpsc_sdma_burstsize(pi, burst_size);
450 return;
451 }
452
453 static inline u32
454 mpsc_sdma_intr_mask(struct mpsc_port_info *pi, u32 mask)
455 {
456 u32 old, v;
457
458 pr_debug("mpsc_sdma_intr_mask[%d]: mask: 0x%x\n", pi->port.line, mask);
459
460 old = v = (pi->mirror_regs) ? pi->shared_regs->SDMA_INTR_MASK_m :
461 readl(pi->shared_regs->sdma_intr_base + SDMA_INTR_MASK);
462
463 mask &= 0xf;
464 if (pi->port.line)
465 mask <<= 8;
466 v &= ~mask;
467
468 if (pi->mirror_regs)
469 pi->shared_regs->SDMA_INTR_MASK_m = v;
470 writel(v, pi->shared_regs->sdma_intr_base + SDMA_INTR_MASK);
471
472 if (pi->port.line)
473 old >>= 8;
474 return old & 0xf;
475 }
476
477 static inline void
478 mpsc_sdma_intr_unmask(struct mpsc_port_info *pi, u32 mask)
479 {
480 u32 v;
481
482 pr_debug("mpsc_sdma_intr_unmask[%d]: mask: 0x%x\n", pi->port.line,mask);
483
484 v = (pi->mirror_regs) ? pi->shared_regs->SDMA_INTR_MASK_m :
485 readl(pi->shared_regs->sdma_intr_base + SDMA_INTR_MASK);
486
487 mask &= 0xf;
488 if (pi->port.line)
489 mask <<= 8;
490 v |= mask;
491
492 if (pi->mirror_regs)
493 pi->shared_regs->SDMA_INTR_MASK_m = v;
494 writel(v, pi->shared_regs->sdma_intr_base + SDMA_INTR_MASK);
495 return;
496 }
497
498 static inline void
499 mpsc_sdma_intr_ack(struct mpsc_port_info *pi)
500 {
501 pr_debug("mpsc_sdma_intr_ack[%d]: Acknowledging IRQ\n", pi->port.line);
502
503 if (pi->mirror_regs)
504 pi->shared_regs->SDMA_INTR_CAUSE_m = 0;
505 writel(0, pi->shared_regs->sdma_intr_base + SDMA_INTR_CAUSE);
506 return;
507 }
508
509 static inline void
510 mpsc_sdma_set_rx_ring(struct mpsc_port_info *pi, struct mpsc_rx_desc *rxre_p)
511 {
512 pr_debug("mpsc_sdma_set_rx_ring[%d]: rxre_p: 0x%x\n",
513 pi->port.line, (u32) rxre_p);
514
515 writel((u32)rxre_p, pi->sdma_base + SDMA_SCRDP);
516 return;
517 }
518
519 static inline void
520 mpsc_sdma_set_tx_ring(struct mpsc_port_info *pi, struct mpsc_tx_desc *txre_p)
521 {
522 writel((u32)txre_p, pi->sdma_base + SDMA_SFTDP);
523 writel((u32)txre_p, pi->sdma_base + SDMA_SCTDP);
524 return;
525 }
526
527 static inline void
528 mpsc_sdma_cmd(struct mpsc_port_info *pi, u32 val)
529 {
530 u32 v;
531
532 v = readl(pi->sdma_base + SDMA_SDCM);
533 if (val)
534 v |= val;
535 else
536 v = 0;
537 wmb();
538 writel(v, pi->sdma_base + SDMA_SDCM);
539 wmb();
540 return;
541 }
542
543 static inline uint
544 mpsc_sdma_tx_active(struct mpsc_port_info *pi)
545 {
546 return readl(pi->sdma_base + SDMA_SDCM) & SDMA_SDCM_TXD;
547 }
548
549 static inline void
550 mpsc_sdma_start_tx(struct mpsc_port_info *pi)
551 {
552 struct mpsc_tx_desc *txre, *txre_p;
553
554 /* If tx isn't running & there's a desc ready to go, start it */
555 if (!mpsc_sdma_tx_active(pi)) {
556 txre = (struct mpsc_tx_desc *)(pi->txr +
557 (pi->txr_tail * MPSC_TXRE_SIZE));
558 dma_cache_sync(pi->port.dev, (void *) txre, MPSC_TXRE_SIZE, DMA_FROM_DEVICE);
559 #if defined(CONFIG_PPC32) && !defined(CONFIG_NOT_COHERENT_CACHE)
560 if (pi->cache_mgmt) /* GT642[46]0 Res #COMM-2 */
561 invalidate_dcache_range((ulong)txre,
562 (ulong)txre + MPSC_TXRE_SIZE);
563 #endif
564
565 if (be32_to_cpu(txre->cmdstat) & SDMA_DESC_CMDSTAT_O) {
566 txre_p = (struct mpsc_tx_desc *)(pi->txr_p +
567 (pi->txr_tail *
568 MPSC_TXRE_SIZE));
569
570 mpsc_sdma_set_tx_ring(pi, txre_p);
571 mpsc_sdma_cmd(pi, SDMA_SDCM_STD | SDMA_SDCM_TXD);
572 }
573 }
574
575 return;
576 }
577
578 static inline void
579 mpsc_sdma_stop(struct mpsc_port_info *pi)
580 {
581 pr_debug("mpsc_sdma_stop[%d]: Stopping SDMA\n", pi->port.line);
582
583 /* Abort any SDMA transfers */
584 mpsc_sdma_cmd(pi, 0);
585 mpsc_sdma_cmd(pi, SDMA_SDCM_AR | SDMA_SDCM_AT);
586
587 /* Clear the SDMA current and first TX and RX pointers */
588 mpsc_sdma_set_tx_ring(pi, NULL);
589 mpsc_sdma_set_rx_ring(pi, NULL);
590
591 /* Disable interrupts */
592 mpsc_sdma_intr_mask(pi, 0xf);
593 mpsc_sdma_intr_ack(pi);
594
595 return;
596 }
597
598 /*
599 ******************************************************************************
600 *
601 * Multi-Protocol Serial Controller Routines (MPSC)
602 *
603 ******************************************************************************
604 */
605
606 static void
607 mpsc_hw_init(struct mpsc_port_info *pi)
608 {
609 u32 v;
610
611 pr_debug("mpsc_hw_init[%d]: Initializing hardware\n", pi->port.line);
612
613 /* Set up clock routing */
614 if (pi->mirror_regs) {
615 v = pi->shared_regs->MPSC_MRR_m;
616 v &= ~0x1c7;
617 pi->shared_regs->MPSC_MRR_m = v;
618 writel(v, pi->shared_regs->mpsc_routing_base + MPSC_MRR);
619
620 v = pi->shared_regs->MPSC_RCRR_m;
621 v = (v & ~0xf0f) | 0x100;
622 pi->shared_regs->MPSC_RCRR_m = v;
623 writel(v, pi->shared_regs->mpsc_routing_base + MPSC_RCRR);
624
625 v = pi->shared_regs->MPSC_TCRR_m;
626 v = (v & ~0xf0f) | 0x100;
627 pi->shared_regs->MPSC_TCRR_m = v;
628 writel(v, pi->shared_regs->mpsc_routing_base + MPSC_TCRR);
629 }
630 else {
631 v = readl(pi->shared_regs->mpsc_routing_base + MPSC_MRR);
632 v &= ~0x1c7;
633 writel(v, pi->shared_regs->mpsc_routing_base + MPSC_MRR);
634
635 v = readl(pi->shared_regs->mpsc_routing_base + MPSC_RCRR);
636 v = (v & ~0xf0f) | 0x100;
637 writel(v, pi->shared_regs->mpsc_routing_base + MPSC_RCRR);
638
639 v = readl(pi->shared_regs->mpsc_routing_base + MPSC_TCRR);
640 v = (v & ~0xf0f) | 0x100;
641 writel(v, pi->shared_regs->mpsc_routing_base + MPSC_TCRR);
642 }
643
644 /* Put MPSC in UART mode & enabel Tx/Rx egines */
645 writel(0x000004c4, pi->mpsc_base + MPSC_MMCRL);
646
647 /* No preamble, 16x divider, low-latency, */
648 writel(0x04400400, pi->mpsc_base + MPSC_MMCRH);
649
650 if (pi->mirror_regs) {
651 pi->MPSC_CHR_1_m = 0;
652 pi->MPSC_CHR_2_m = 0;
653 }
654 writel(0, pi->mpsc_base + MPSC_CHR_1);
655 writel(0, pi->mpsc_base + MPSC_CHR_2);
656 writel(pi->mpsc_max_idle, pi->mpsc_base + MPSC_CHR_3);
657 writel(0, pi->mpsc_base + MPSC_CHR_4);
658 writel(0, pi->mpsc_base + MPSC_CHR_5);
659 writel(0, pi->mpsc_base + MPSC_CHR_6);
660 writel(0, pi->mpsc_base + MPSC_CHR_7);
661 writel(0, pi->mpsc_base + MPSC_CHR_8);
662 writel(0, pi->mpsc_base + MPSC_CHR_9);
663 writel(0, pi->mpsc_base + MPSC_CHR_10);
664
665 return;
666 }
667
668 static inline void
669 mpsc_enter_hunt(struct mpsc_port_info *pi)
670 {
671 pr_debug("mpsc_enter_hunt[%d]: Hunting...\n", pi->port.line);
672
673 if (pi->mirror_regs) {
674 writel(pi->MPSC_CHR_2_m | MPSC_CHR_2_EH,
675 pi->mpsc_base + MPSC_CHR_2);
676 /* Erratum prevents reading CHR_2 so just delay for a while */
677 udelay(100);
678 }
679 else {
680 writel(readl(pi->mpsc_base + MPSC_CHR_2) | MPSC_CHR_2_EH,
681 pi->mpsc_base + MPSC_CHR_2);
682
683 while (readl(pi->mpsc_base + MPSC_CHR_2) & MPSC_CHR_2_EH)
684 udelay(10);
685 }
686
687 return;
688 }
689
690 static inline void
691 mpsc_freeze(struct mpsc_port_info *pi)
692 {
693 u32 v;
694
695 pr_debug("mpsc_freeze[%d]: Freezing\n", pi->port.line);
696
697 v = (pi->mirror_regs) ? pi->MPSC_MPCR_m :
698 readl(pi->mpsc_base + MPSC_MPCR);
699 v |= MPSC_MPCR_FRZ;
700
701 if (pi->mirror_regs)
702 pi->MPSC_MPCR_m = v;
703 writel(v, pi->mpsc_base + MPSC_MPCR);
704 return;
705 }
706
707 static inline void
708 mpsc_unfreeze(struct mpsc_port_info *pi)
709 {
710 u32 v;
711
712 v = (pi->mirror_regs) ? pi->MPSC_MPCR_m :
713 readl(pi->mpsc_base + MPSC_MPCR);
714 v &= ~MPSC_MPCR_FRZ;
715
716 if (pi->mirror_regs)
717 pi->MPSC_MPCR_m = v;
718 writel(v, pi->mpsc_base + MPSC_MPCR);
719
720 pr_debug("mpsc_unfreeze[%d]: Unfrozen\n", pi->port.line);
721 return;
722 }
723
724 static inline void
725 mpsc_set_char_length(struct mpsc_port_info *pi, u32 len)
726 {
727 u32 v;
728
729 pr_debug("mpsc_set_char_length[%d]: char len: %d\n", pi->port.line,len);
730
731 v = (pi->mirror_regs) ? pi->MPSC_MPCR_m :
732 readl(pi->mpsc_base + MPSC_MPCR);
733 v = (v & ~(0x3 << 12)) | ((len & 0x3) << 12);
734
735 if (pi->mirror_regs)
736 pi->MPSC_MPCR_m = v;
737 writel(v, pi->mpsc_base + MPSC_MPCR);
738 return;
739 }
740
741 static inline void
742 mpsc_set_stop_bit_length(struct mpsc_port_info *pi, u32 len)
743 {
744 u32 v;
745
746 pr_debug("mpsc_set_stop_bit_length[%d]: stop bits: %d\n",
747 pi->port.line, len);
748
749 v = (pi->mirror_regs) ? pi->MPSC_MPCR_m :
750 readl(pi->mpsc_base + MPSC_MPCR);
751
752 v = (v & ~(1 << 14)) | ((len & 0x1) << 14);
753
754 if (pi->mirror_regs)
755 pi->MPSC_MPCR_m = v;
756 writel(v, pi->mpsc_base + MPSC_MPCR);
757 return;
758 }
759
760 static inline void
761 mpsc_set_parity(struct mpsc_port_info *pi, u32 p)
762 {
763 u32 v;
764
765 pr_debug("mpsc_set_parity[%d]: parity bits: 0x%x\n", pi->port.line, p);
766
767 v = (pi->mirror_regs) ? pi->MPSC_CHR_2_m :
768 readl(pi->mpsc_base + MPSC_CHR_2);
769
770 p &= 0x3;
771 v = (v & ~0xc000c) | (p << 18) | (p << 2);
772
773 if (pi->mirror_regs)
774 pi->MPSC_CHR_2_m = v;
775 writel(v, pi->mpsc_base + MPSC_CHR_2);
776 return;
777 }
778
779 /*
780 ******************************************************************************
781 *
782 * Driver Init Routines
783 *
784 ******************************************************************************
785 */
786
787 static void
788 mpsc_init_hw(struct mpsc_port_info *pi)
789 {
790 pr_debug("mpsc_init_hw[%d]: Initializing\n", pi->port.line);
791
792 mpsc_brg_init(pi, pi->brg_clk_src);
793 mpsc_brg_enable(pi);
794 mpsc_sdma_init(pi, dma_get_cache_alignment()); /* burst a cacheline */
795 mpsc_sdma_stop(pi);
796 mpsc_hw_init(pi);
797
798 return;
799 }
800
801 static int
802 mpsc_alloc_ring_mem(struct mpsc_port_info *pi)
803 {
804 int rc = 0;
805
806 pr_debug("mpsc_alloc_ring_mem[%d]: Allocating ring mem\n",
807 pi->port.line);
808
809 if (!pi->dma_region) {
810 if (!dma_supported(pi->port.dev, 0xffffffff)) {
811 printk(KERN_ERR "MPSC: Inadequate DMA support\n");
812 rc = -ENXIO;
813 }
814 else if ((pi->dma_region = dma_alloc_noncoherent(pi->port.dev,
815 MPSC_DMA_ALLOC_SIZE, &pi->dma_region_p, GFP_KERNEL))
816 == NULL) {
817
818 printk(KERN_ERR "MPSC: Can't alloc Desc region\n");
819 rc = -ENOMEM;
820 }
821 }
822
823 return rc;
824 }
825
826 static void
827 mpsc_free_ring_mem(struct mpsc_port_info *pi)
828 {
829 pr_debug("mpsc_free_ring_mem[%d]: Freeing ring mem\n", pi->port.line);
830
831 if (pi->dma_region) {
832 dma_free_noncoherent(pi->port.dev, MPSC_DMA_ALLOC_SIZE,
833 pi->dma_region, pi->dma_region_p);
834 pi->dma_region = NULL;
835 pi->dma_region_p = (dma_addr_t) NULL;
836 }
837
838 return;
839 }
840
841 static void
842 mpsc_init_rings(struct mpsc_port_info *pi)
843 {
844 struct mpsc_rx_desc *rxre;
845 struct mpsc_tx_desc *txre;
846 dma_addr_t dp, dp_p;
847 u8 *bp, *bp_p;
848 int i;
849
850 pr_debug("mpsc_init_rings[%d]: Initializing rings\n", pi->port.line);
851
852 BUG_ON(pi->dma_region == NULL);
853
854 memset(pi->dma_region, 0, MPSC_DMA_ALLOC_SIZE);
855
856 /*
857 * Descriptors & buffers are multiples of cacheline size and must be
858 * cacheline aligned.
859 */
860 dp = ALIGN((u32) pi->dma_region, dma_get_cache_alignment());
861 dp_p = ALIGN((u32) pi->dma_region_p, dma_get_cache_alignment());
862
863 /*
864 * Partition dma region into rx ring descriptor, rx buffers,
865 * tx ring descriptors, and tx buffers.
866 */
867 pi->rxr = dp;
868 pi->rxr_p = dp_p;
869 dp += MPSC_RXR_SIZE;
870 dp_p += MPSC_RXR_SIZE;
871
872 pi->rxb = (u8 *) dp;
873 pi->rxb_p = (u8 *) dp_p;
874 dp += MPSC_RXB_SIZE;
875 dp_p += MPSC_RXB_SIZE;
876
877 pi->rxr_posn = 0;
878
879 pi->txr = dp;
880 pi->txr_p = dp_p;
881 dp += MPSC_TXR_SIZE;
882 dp_p += MPSC_TXR_SIZE;
883
884 pi->txb = (u8 *) dp;
885 pi->txb_p = (u8 *) dp_p;
886
887 pi->txr_head = 0;
888 pi->txr_tail = 0;
889
890 /* Init rx ring descriptors */
891 dp = pi->rxr;
892 dp_p = pi->rxr_p;
893 bp = pi->rxb;
894 bp_p = pi->rxb_p;
895
896 for (i = 0; i < MPSC_RXR_ENTRIES; i++) {
897 rxre = (struct mpsc_rx_desc *)dp;
898
899 rxre->bufsize = cpu_to_be16(MPSC_RXBE_SIZE);
900 rxre->bytecnt = cpu_to_be16(0);
901 rxre->cmdstat = cpu_to_be32(SDMA_DESC_CMDSTAT_O |
902 SDMA_DESC_CMDSTAT_EI |
903 SDMA_DESC_CMDSTAT_F |
904 SDMA_DESC_CMDSTAT_L);
905 rxre->link = cpu_to_be32(dp_p + MPSC_RXRE_SIZE);
906 rxre->buf_ptr = cpu_to_be32(bp_p);
907
908 dp += MPSC_RXRE_SIZE;
909 dp_p += MPSC_RXRE_SIZE;
910 bp += MPSC_RXBE_SIZE;
911 bp_p += MPSC_RXBE_SIZE;
912 }
913 rxre->link = cpu_to_be32(pi->rxr_p); /* Wrap last back to first */
914
915 /* Init tx ring descriptors */
916 dp = pi->txr;
917 dp_p = pi->txr_p;
918 bp = pi->txb;
919 bp_p = pi->txb_p;
920
921 for (i = 0; i < MPSC_TXR_ENTRIES; i++) {
922 txre = (struct mpsc_tx_desc *)dp;
923
924 txre->link = cpu_to_be32(dp_p + MPSC_TXRE_SIZE);
925 txre->buf_ptr = cpu_to_be32(bp_p);
926
927 dp += MPSC_TXRE_SIZE;
928 dp_p += MPSC_TXRE_SIZE;
929 bp += MPSC_TXBE_SIZE;
930 bp_p += MPSC_TXBE_SIZE;
931 }
932 txre->link = cpu_to_be32(pi->txr_p); /* Wrap last back to first */
933
934 dma_cache_sync(pi->port.dev, (void *) pi->dma_region, MPSC_DMA_ALLOC_SIZE,
935 DMA_BIDIRECTIONAL);
936 #if defined(CONFIG_PPC32) && !defined(CONFIG_NOT_COHERENT_CACHE)
937 if (pi->cache_mgmt) /* GT642[46]0 Res #COMM-2 */
938 flush_dcache_range((ulong)pi->dma_region,
939 (ulong)pi->dma_region + MPSC_DMA_ALLOC_SIZE);
940 #endif
941
942 return;
943 }
944
945 static void
946 mpsc_uninit_rings(struct mpsc_port_info *pi)
947 {
948 pr_debug("mpsc_uninit_rings[%d]: Uninitializing rings\n",pi->port.line);
949
950 BUG_ON(pi->dma_region == NULL);
951
952 pi->rxr = 0;
953 pi->rxr_p = 0;
954 pi->rxb = NULL;
955 pi->rxb_p = NULL;
956 pi->rxr_posn = 0;
957
958 pi->txr = 0;
959 pi->txr_p = 0;
960 pi->txb = NULL;
961 pi->txb_p = NULL;
962 pi->txr_head = 0;
963 pi->txr_tail = 0;
964
965 return;
966 }
967
968 static int
969 mpsc_make_ready(struct mpsc_port_info *pi)
970 {
971 int rc;
972
973 pr_debug("mpsc_make_ready[%d]: Making cltr ready\n", pi->port.line);
974
975 if (!pi->ready) {
976 mpsc_init_hw(pi);
977 if ((rc = mpsc_alloc_ring_mem(pi)))
978 return rc;
979 mpsc_init_rings(pi);
980 pi->ready = 1;
981 }
982
983 return 0;
984 }
985
986 /*
987 ******************************************************************************
988 *
989 * Interrupt Handling Routines
990 *
991 ******************************************************************************
992 */
993
994 static inline int
995 mpsc_rx_intr(struct mpsc_port_info *pi)
996 {
997 struct mpsc_rx_desc *rxre;
998 struct tty_struct *tty = pi->port.info->tty;
999 u32 cmdstat, bytes_in, i;
1000 int rc = 0;
1001 u8 *bp;
1002 char flag = TTY_NORMAL;
1003
1004 pr_debug("mpsc_rx_intr[%d]: Handling Rx intr\n", pi->port.line);
1005
1006 rxre = (struct mpsc_rx_desc *)(pi->rxr + (pi->rxr_posn*MPSC_RXRE_SIZE));
1007
1008 dma_cache_sync(pi->port.dev, (void *)rxre, MPSC_RXRE_SIZE, DMA_FROM_DEVICE);
1009 #if defined(CONFIG_PPC32) && !defined(CONFIG_NOT_COHERENT_CACHE)
1010 if (pi->cache_mgmt) /* GT642[46]0 Res #COMM-2 */
1011 invalidate_dcache_range((ulong)rxre,
1012 (ulong)rxre + MPSC_RXRE_SIZE);
1013 #endif
1014
1015 /*
1016 * Loop through Rx descriptors handling ones that have been completed.
1017 */
1018 while (!((cmdstat = be32_to_cpu(rxre->cmdstat)) & SDMA_DESC_CMDSTAT_O)){
1019 bytes_in = be16_to_cpu(rxre->bytecnt);
1020
1021 /* Following use of tty struct directly is deprecated */
1022 if (unlikely(tty_buffer_request_room(tty, bytes_in) < bytes_in)) {
1023 if (tty->low_latency)
1024 tty_flip_buffer_push(tty);
1025 /*
1026 * If this failed then we will throw away the bytes
1027 * but must do so to clear interrupts.
1028 */
1029 }
1030
1031 bp = pi->rxb + (pi->rxr_posn * MPSC_RXBE_SIZE);
1032 dma_cache_sync(pi->port.dev, (void *) bp, MPSC_RXBE_SIZE, DMA_FROM_DEVICE);
1033 #if defined(CONFIG_PPC32) && !defined(CONFIG_NOT_COHERENT_CACHE)
1034 if (pi->cache_mgmt) /* GT642[46]0 Res #COMM-2 */
1035 invalidate_dcache_range((ulong)bp,
1036 (ulong)bp + MPSC_RXBE_SIZE);
1037 #endif
1038
1039 /*
1040 * Other than for parity error, the manual provides little
1041 * info on what data will be in a frame flagged by any of
1042 * these errors. For parity error, it is the last byte in
1043 * the buffer that had the error. As for the rest, I guess
1044 * we'll assume there is no data in the buffer.
1045 * If there is...it gets lost.
1046 */
1047 if (unlikely(cmdstat & (SDMA_DESC_CMDSTAT_BR |
1048 SDMA_DESC_CMDSTAT_FR | SDMA_DESC_CMDSTAT_OR))) {
1049
1050 pi->port.icount.rx++;
1051
1052 if (cmdstat & SDMA_DESC_CMDSTAT_BR) { /* Break */
1053 pi->port.icount.brk++;
1054
1055 if (uart_handle_break(&pi->port))
1056 goto next_frame;
1057 }
1058 else if (cmdstat & SDMA_DESC_CMDSTAT_FR)/* Framing */
1059 pi->port.icount.frame++;
1060 else if (cmdstat & SDMA_DESC_CMDSTAT_OR) /* Overrun */
1061 pi->port.icount.overrun++;
1062
1063 cmdstat &= pi->port.read_status_mask;
1064
1065 if (cmdstat & SDMA_DESC_CMDSTAT_BR)
1066 flag = TTY_BREAK;
1067 else if (cmdstat & SDMA_DESC_CMDSTAT_FR)
1068 flag = TTY_FRAME;
1069 else if (cmdstat & SDMA_DESC_CMDSTAT_OR)
1070 flag = TTY_OVERRUN;
1071 else if (cmdstat & SDMA_DESC_CMDSTAT_PE)
1072 flag = TTY_PARITY;
1073 }
1074
1075 if (uart_handle_sysrq_char(&pi->port, *bp)) {
1076 bp++;
1077 bytes_in--;
1078 goto next_frame;
1079 }
1080
1081 if ((unlikely(cmdstat & (SDMA_DESC_CMDSTAT_BR |
1082 SDMA_DESC_CMDSTAT_FR | SDMA_DESC_CMDSTAT_OR))) &&
1083 !(cmdstat & pi->port.ignore_status_mask))
1084
1085 tty_insert_flip_char(tty, *bp, flag);
1086 else {
1087 for (i=0; i<bytes_in; i++)
1088 tty_insert_flip_char(tty, *bp++, TTY_NORMAL);
1089
1090 pi->port.icount.rx += bytes_in;
1091 }
1092
1093 next_frame:
1094 rxre->bytecnt = cpu_to_be16(0);
1095 wmb();
1096 rxre->cmdstat = cpu_to_be32(SDMA_DESC_CMDSTAT_O |
1097 SDMA_DESC_CMDSTAT_EI |
1098 SDMA_DESC_CMDSTAT_F |
1099 SDMA_DESC_CMDSTAT_L);
1100 wmb();
1101 dma_cache_sync(pi->port.dev, (void *)rxre, MPSC_RXRE_SIZE, DMA_BIDIRECTIONAL);
1102 #if defined(CONFIG_PPC32) && !defined(CONFIG_NOT_COHERENT_CACHE)
1103 if (pi->cache_mgmt) /* GT642[46]0 Res #COMM-2 */
1104 flush_dcache_range((ulong)rxre,
1105 (ulong)rxre + MPSC_RXRE_SIZE);
1106 #endif
1107
1108 /* Advance to next descriptor */
1109 pi->rxr_posn = (pi->rxr_posn + 1) & (MPSC_RXR_ENTRIES - 1);
1110 rxre = (struct mpsc_rx_desc *)(pi->rxr +
1111 (pi->rxr_posn * MPSC_RXRE_SIZE));
1112 dma_cache_sync(pi->port.dev, (void *)rxre, MPSC_RXRE_SIZE, DMA_FROM_DEVICE);
1113 #if defined(CONFIG_PPC32) && !defined(CONFIG_NOT_COHERENT_CACHE)
1114 if (pi->cache_mgmt) /* GT642[46]0 Res #COMM-2 */
1115 invalidate_dcache_range((ulong)rxre,
1116 (ulong)rxre + MPSC_RXRE_SIZE);
1117 #endif
1118
1119 rc = 1;
1120 }
1121
1122 /* Restart rx engine, if its stopped */
1123 if ((readl(pi->sdma_base + SDMA_SDCM) & SDMA_SDCM_ERD) == 0)
1124 mpsc_start_rx(pi);
1125
1126 tty_flip_buffer_push(tty);
1127 return rc;
1128 }
1129
1130 static inline void
1131 mpsc_setup_tx_desc(struct mpsc_port_info *pi, u32 count, u32 intr)
1132 {
1133 struct mpsc_tx_desc *txre;
1134
1135 txre = (struct mpsc_tx_desc *)(pi->txr +
1136 (pi->txr_head * MPSC_TXRE_SIZE));
1137
1138 txre->bytecnt = cpu_to_be16(count);
1139 txre->shadow = txre->bytecnt;
1140 wmb(); /* ensure cmdstat is last field updated */
1141 txre->cmdstat = cpu_to_be32(SDMA_DESC_CMDSTAT_O | SDMA_DESC_CMDSTAT_F |
1142 SDMA_DESC_CMDSTAT_L | ((intr) ?
1143 SDMA_DESC_CMDSTAT_EI
1144 : 0));
1145 wmb();
1146 dma_cache_sync(pi->port.dev, (void *) txre, MPSC_TXRE_SIZE, DMA_BIDIRECTIONAL);
1147 #if defined(CONFIG_PPC32) && !defined(CONFIG_NOT_COHERENT_CACHE)
1148 if (pi->cache_mgmt) /* GT642[46]0 Res #COMM-2 */
1149 flush_dcache_range((ulong)txre,
1150 (ulong)txre + MPSC_TXRE_SIZE);
1151 #endif
1152
1153 return;
1154 }
1155
1156 static inline void
1157 mpsc_copy_tx_data(struct mpsc_port_info *pi)
1158 {
1159 struct circ_buf *xmit = &pi->port.info->xmit;
1160 u8 *bp;
1161 u32 i;
1162
1163 /* Make sure the desc ring isn't full */
1164 while (CIRC_CNT(pi->txr_head, pi->txr_tail, MPSC_TXR_ENTRIES) <
1165 (MPSC_TXR_ENTRIES - 1)) {
1166 if (pi->port.x_char) {
1167 /*
1168 * Ideally, we should use the TCS field in
1169 * CHR_1 to put the x_char out immediately but
1170 * errata prevents us from being able to read
1171 * CHR_2 to know that its safe to write to
1172 * CHR_1. Instead, just put it in-band with
1173 * all the other Tx data.
1174 */
1175 bp = pi->txb + (pi->txr_head * MPSC_TXBE_SIZE);
1176 *bp = pi->port.x_char;
1177 pi->port.x_char = 0;
1178 i = 1;
1179 }
1180 else if (!uart_circ_empty(xmit) && !uart_tx_stopped(&pi->port)){
1181 i = min((u32) MPSC_TXBE_SIZE,
1182 (u32) uart_circ_chars_pending(xmit));
1183 i = min(i, (u32) CIRC_CNT_TO_END(xmit->head, xmit->tail,
1184 UART_XMIT_SIZE));
1185 bp = pi->txb + (pi->txr_head * MPSC_TXBE_SIZE);
1186 memcpy(bp, &xmit->buf[xmit->tail], i);
1187 xmit->tail = (xmit->tail + i) & (UART_XMIT_SIZE - 1);
1188
1189 if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
1190 uart_write_wakeup(&pi->port);
1191 }
1192 else /* All tx data copied into ring bufs */
1193 return;
1194
1195 dma_cache_sync(pi->port.dev, (void *) bp, MPSC_TXBE_SIZE, DMA_BIDIRECTIONAL);
1196 #if defined(CONFIG_PPC32) && !defined(CONFIG_NOT_COHERENT_CACHE)
1197 if (pi->cache_mgmt) /* GT642[46]0 Res #COMM-2 */
1198 flush_dcache_range((ulong)bp,
1199 (ulong)bp + MPSC_TXBE_SIZE);
1200 #endif
1201 mpsc_setup_tx_desc(pi, i, 1);
1202
1203 /* Advance to next descriptor */
1204 pi->txr_head = (pi->txr_head + 1) & (MPSC_TXR_ENTRIES - 1);
1205 }
1206
1207 return;
1208 }
1209
1210 static inline int
1211 mpsc_tx_intr(struct mpsc_port_info *pi)
1212 {
1213 struct mpsc_tx_desc *txre;
1214 int rc = 0;
1215
1216 if (!mpsc_sdma_tx_active(pi)) {
1217 txre = (struct mpsc_tx_desc *)(pi->txr +
1218 (pi->txr_tail * MPSC_TXRE_SIZE));
1219
1220 dma_cache_sync(pi->port.dev, (void *) txre, MPSC_TXRE_SIZE, DMA_FROM_DEVICE);
1221 #if defined(CONFIG_PPC32) && !defined(CONFIG_NOT_COHERENT_CACHE)
1222 if (pi->cache_mgmt) /* GT642[46]0 Res #COMM-2 */
1223 invalidate_dcache_range((ulong)txre,
1224 (ulong)txre + MPSC_TXRE_SIZE);
1225 #endif
1226
1227 while (!(be32_to_cpu(txre->cmdstat) & SDMA_DESC_CMDSTAT_O)) {
1228 rc = 1;
1229 pi->port.icount.tx += be16_to_cpu(txre->bytecnt);
1230 pi->txr_tail = (pi->txr_tail+1) & (MPSC_TXR_ENTRIES-1);
1231
1232 /* If no more data to tx, fall out of loop */
1233 if (pi->txr_head == pi->txr_tail)
1234 break;
1235
1236 txre = (struct mpsc_tx_desc *)(pi->txr +
1237 (pi->txr_tail * MPSC_TXRE_SIZE));
1238 dma_cache_sync(pi->port.dev, (void *) txre, MPSC_TXRE_SIZE,
1239 DMA_FROM_DEVICE);
1240 #if defined(CONFIG_PPC32) && !defined(CONFIG_NOT_COHERENT_CACHE)
1241 if (pi->cache_mgmt) /* GT642[46]0 Res #COMM-2 */
1242 invalidate_dcache_range((ulong)txre,
1243 (ulong)txre + MPSC_TXRE_SIZE);
1244 #endif
1245 }
1246
1247 mpsc_copy_tx_data(pi);
1248 mpsc_sdma_start_tx(pi); /* start next desc if ready */
1249 }
1250
1251 return rc;
1252 }
1253
1254 /*
1255 * This is the driver's interrupt handler. To avoid a race, we first clear
1256 * the interrupt, then handle any completed Rx/Tx descriptors. When done
1257 * handling those descriptors, we restart the Rx/Tx engines if they're stopped.
1258 */
1259 static irqreturn_t
1260 mpsc_sdma_intr(int irq, void *dev_id)
1261 {
1262 struct mpsc_port_info *pi = dev_id;
1263 ulong iflags;
1264 int rc = IRQ_NONE;
1265
1266 pr_debug("mpsc_sdma_intr[%d]: SDMA Interrupt Received\n",pi->port.line);
1267
1268 spin_lock_irqsave(&pi->port.lock, iflags);
1269 mpsc_sdma_intr_ack(pi);
1270 if (mpsc_rx_intr(pi))
1271 rc = IRQ_HANDLED;
1272 if (mpsc_tx_intr(pi))
1273 rc = IRQ_HANDLED;
1274 spin_unlock_irqrestore(&pi->port.lock, iflags);
1275
1276 pr_debug("mpsc_sdma_intr[%d]: SDMA Interrupt Handled\n", pi->port.line);
1277 return rc;
1278 }
1279
1280 /*
1281 ******************************************************************************
1282 *
1283 * serial_core.c Interface routines
1284 *
1285 ******************************************************************************
1286 */
1287 static uint
1288 mpsc_tx_empty(struct uart_port *port)
1289 {
1290 struct mpsc_port_info *pi = (struct mpsc_port_info *)port;
1291 ulong iflags;
1292 uint rc;
1293
1294 spin_lock_irqsave(&pi->port.lock, iflags);
1295 rc = mpsc_sdma_tx_active(pi) ? 0 : TIOCSER_TEMT;
1296 spin_unlock_irqrestore(&pi->port.lock, iflags);
1297
1298 return rc;
1299 }
1300
1301 static void
1302 mpsc_set_mctrl(struct uart_port *port, uint mctrl)
1303 {
1304 /* Have no way to set modem control lines AFAICT */
1305 return;
1306 }
1307
1308 static uint
1309 mpsc_get_mctrl(struct uart_port *port)
1310 {
1311 struct mpsc_port_info *pi = (struct mpsc_port_info *)port;
1312 u32 mflags, status;
1313
1314 status = (pi->mirror_regs) ? pi->MPSC_CHR_10_m :
1315 readl(pi->mpsc_base + MPSC_CHR_10);
1316
1317 mflags = 0;
1318 if (status & 0x1)
1319 mflags |= TIOCM_CTS;
1320 if (status & 0x2)
1321 mflags |= TIOCM_CAR;
1322
1323 return mflags | TIOCM_DSR; /* No way to tell if DSR asserted */
1324 }
1325
1326 static void
1327 mpsc_stop_tx(struct uart_port *port)
1328 {
1329 struct mpsc_port_info *pi = (struct mpsc_port_info *)port;
1330
1331 pr_debug("mpsc_stop_tx[%d]\n", port->line);
1332
1333 mpsc_freeze(pi);
1334 return;
1335 }
1336
1337 static void
1338 mpsc_start_tx(struct uart_port *port)
1339 {
1340 struct mpsc_port_info *pi = (struct mpsc_port_info *)port;
1341
1342 mpsc_unfreeze(pi);
1343 mpsc_copy_tx_data(pi);
1344 mpsc_sdma_start_tx(pi);
1345
1346 pr_debug("mpsc_start_tx[%d]\n", port->line);
1347 return;
1348 }
1349
1350 static void
1351 mpsc_start_rx(struct mpsc_port_info *pi)
1352 {
1353 pr_debug("mpsc_start_rx[%d]: Starting...\n", pi->port.line);
1354
1355 /* Issue a Receive Abort to clear any receive errors */
1356 writel(MPSC_CHR_2_RA, pi->mpsc_base + MPSC_CHR_2);
1357 if (pi->rcv_data) {
1358 mpsc_enter_hunt(pi);
1359 mpsc_sdma_cmd(pi, SDMA_SDCM_ERD);
1360 }
1361 return;
1362 }
1363
1364 static void
1365 mpsc_stop_rx(struct uart_port *port)
1366 {
1367 struct mpsc_port_info *pi = (struct mpsc_port_info *)port;
1368
1369 pr_debug("mpsc_stop_rx[%d]: Stopping...\n", port->line);
1370
1371 mpsc_sdma_cmd(pi, SDMA_SDCM_AR);
1372 return;
1373 }
1374
1375 static void
1376 mpsc_enable_ms(struct uart_port *port)
1377 {
1378 return; /* Not supported */
1379 }
1380
1381 static void
1382 mpsc_break_ctl(struct uart_port *port, int ctl)
1383 {
1384 struct mpsc_port_info *pi = (struct mpsc_port_info *)port;
1385 ulong flags;
1386 u32 v;
1387
1388 v = ctl ? 0x00ff0000 : 0;
1389
1390 spin_lock_irqsave(&pi->port.lock, flags);
1391 if (pi->mirror_regs)
1392 pi->MPSC_CHR_1_m = v;
1393 writel(v, pi->mpsc_base + MPSC_CHR_1);
1394 spin_unlock_irqrestore(&pi->port.lock, flags);
1395
1396 return;
1397 }
1398
1399 static int
1400 mpsc_startup(struct uart_port *port)
1401 {
1402 struct mpsc_port_info *pi = (struct mpsc_port_info *)port;
1403 u32 flag = 0;
1404 int rc;
1405
1406 pr_debug("mpsc_startup[%d]: Starting up MPSC, irq: %d\n",
1407 port->line, pi->port.irq);
1408
1409 if ((rc = mpsc_make_ready(pi)) == 0) {
1410 /* Setup IRQ handler */
1411 mpsc_sdma_intr_ack(pi);
1412
1413 /* If irq's are shared, need to set flag */
1414 if (mpsc_ports[0].port.irq == mpsc_ports[1].port.irq)
1415 flag = IRQF_SHARED;
1416
1417 if (request_irq(pi->port.irq, mpsc_sdma_intr, flag,
1418 "mpsc-sdma", pi))
1419 printk(KERN_ERR "MPSC: Can't get SDMA IRQ %d\n",
1420 pi->port.irq);
1421
1422 mpsc_sdma_intr_unmask(pi, 0xf);
1423 mpsc_sdma_set_rx_ring(pi, (struct mpsc_rx_desc *)(pi->rxr_p +
1424 (pi->rxr_posn * MPSC_RXRE_SIZE)));
1425 }
1426
1427 return rc;
1428 }
1429
1430 static void
1431 mpsc_shutdown(struct uart_port *port)
1432 {
1433 struct mpsc_port_info *pi = (struct mpsc_port_info *)port;
1434
1435 pr_debug("mpsc_shutdown[%d]: Shutting down MPSC\n", port->line);
1436
1437 mpsc_sdma_stop(pi);
1438 free_irq(pi->port.irq, pi);
1439 return;
1440 }
1441
1442 static void
1443 mpsc_set_termios(struct uart_port *port, struct ktermios *termios,
1444 struct ktermios *old)
1445 {
1446 struct mpsc_port_info *pi = (struct mpsc_port_info *)port;
1447 u32 baud;
1448 ulong flags;
1449 u32 chr_bits, stop_bits, par;
1450
1451 pi->c_iflag = termios->c_iflag;
1452 pi->c_cflag = termios->c_cflag;
1453
1454 switch (termios->c_cflag & CSIZE) {
1455 case CS5:
1456 chr_bits = MPSC_MPCR_CL_5;
1457 break;
1458 case CS6:
1459 chr_bits = MPSC_MPCR_CL_6;
1460 break;
1461 case CS7:
1462 chr_bits = MPSC_MPCR_CL_7;
1463 break;
1464 case CS8:
1465 default:
1466 chr_bits = MPSC_MPCR_CL_8;
1467 break;
1468 }
1469
1470 if (termios->c_cflag & CSTOPB)
1471 stop_bits = MPSC_MPCR_SBL_2;
1472 else
1473 stop_bits = MPSC_MPCR_SBL_1;
1474
1475 par = MPSC_CHR_2_PAR_EVEN;
1476 if (termios->c_cflag & PARENB)
1477 if (termios->c_cflag & PARODD)
1478 par = MPSC_CHR_2_PAR_ODD;
1479 #ifdef CMSPAR
1480 if (termios->c_cflag & CMSPAR) {
1481 if (termios->c_cflag & PARODD)
1482 par = MPSC_CHR_2_PAR_MARK;
1483 else
1484 par = MPSC_CHR_2_PAR_SPACE;
1485 }
1486 #endif
1487
1488 baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk);
1489
1490 spin_lock_irqsave(&pi->port.lock, flags);
1491
1492 uart_update_timeout(port, termios->c_cflag, baud);
1493
1494 mpsc_set_char_length(pi, chr_bits);
1495 mpsc_set_stop_bit_length(pi, stop_bits);
1496 mpsc_set_parity(pi, par);
1497 mpsc_set_baudrate(pi, baud);
1498
1499 /* Characters/events to read */
1500 pi->rcv_data = 1;
1501 pi->port.read_status_mask = SDMA_DESC_CMDSTAT_OR;
1502
1503 if (termios->c_iflag & INPCK)
1504 pi->port.read_status_mask |= SDMA_DESC_CMDSTAT_PE |
1505 SDMA_DESC_CMDSTAT_FR;
1506
1507 if (termios->c_iflag & (BRKINT | PARMRK))
1508 pi->port.read_status_mask |= SDMA_DESC_CMDSTAT_BR;
1509
1510 /* Characters/events to ignore */
1511 pi->port.ignore_status_mask = 0;
1512
1513 if (termios->c_iflag & IGNPAR)
1514 pi->port.ignore_status_mask |= SDMA_DESC_CMDSTAT_PE |
1515 SDMA_DESC_CMDSTAT_FR;
1516
1517 if (termios->c_iflag & IGNBRK) {
1518 pi->port.ignore_status_mask |= SDMA_DESC_CMDSTAT_BR;
1519
1520 if (termios->c_iflag & IGNPAR)
1521 pi->port.ignore_status_mask |= SDMA_DESC_CMDSTAT_OR;
1522 }
1523
1524 /* Ignore all chars if CREAD not set */
1525 if (!(termios->c_cflag & CREAD))
1526 pi->rcv_data = 0;
1527 else
1528 mpsc_start_rx(pi);
1529
1530 spin_unlock_irqrestore(&pi->port.lock, flags);
1531 return;
1532 }
1533
1534 static const char *
1535 mpsc_type(struct uart_port *port)
1536 {
1537 pr_debug("mpsc_type[%d]: port type: %s\n", port->line,MPSC_DRIVER_NAME);
1538 return MPSC_DRIVER_NAME;
1539 }
1540
1541 static int
1542 mpsc_request_port(struct uart_port *port)
1543 {
1544 /* Should make chip/platform specific call */
1545 return 0;
1546 }
1547
1548 static void
1549 mpsc_release_port(struct uart_port *port)
1550 {
1551 struct mpsc_port_info *pi = (struct mpsc_port_info *)port;
1552
1553 if (pi->ready) {
1554 mpsc_uninit_rings(pi);
1555 mpsc_free_ring_mem(pi);
1556 pi->ready = 0;
1557 }
1558
1559 return;
1560 }
1561
1562 static void
1563 mpsc_config_port(struct uart_port *port, int flags)
1564 {
1565 return;
1566 }
1567
1568 static int
1569 mpsc_verify_port(struct uart_port *port, struct serial_struct *ser)
1570 {
1571 struct mpsc_port_info *pi = (struct mpsc_port_info *)port;
1572 int rc = 0;
1573
1574 pr_debug("mpsc_verify_port[%d]: Verifying port data\n", pi->port.line);
1575
1576 if (ser->type != PORT_UNKNOWN && ser->type != PORT_MPSC)
1577 rc = -EINVAL;
1578 else if (pi->port.irq != ser->irq)
1579 rc = -EINVAL;
1580 else if (ser->io_type != SERIAL_IO_MEM)
1581 rc = -EINVAL;
1582 else if (pi->port.uartclk / 16 != ser->baud_base) /* Not sure */
1583 rc = -EINVAL;
1584 else if ((void *)pi->port.mapbase != ser->iomem_base)
1585 rc = -EINVAL;
1586 else if (pi->port.iobase != ser->port)
1587 rc = -EINVAL;
1588 else if (ser->hub6 != 0)
1589 rc = -EINVAL;
1590
1591 return rc;
1592 }
1593
1594 static struct uart_ops mpsc_pops = {
1595 .tx_empty = mpsc_tx_empty,
1596 .set_mctrl = mpsc_set_mctrl,
1597 .get_mctrl = mpsc_get_mctrl,
1598 .stop_tx = mpsc_stop_tx,
1599 .start_tx = mpsc_start_tx,
1600 .stop_rx = mpsc_stop_rx,
1601 .enable_ms = mpsc_enable_ms,
1602 .break_ctl = mpsc_break_ctl,
1603 .startup = mpsc_startup,
1604 .shutdown = mpsc_shutdown,
1605 .set_termios = mpsc_set_termios,
1606 .type = mpsc_type,
1607 .release_port = mpsc_release_port,
1608 .request_port = mpsc_request_port,
1609 .config_port = mpsc_config_port,
1610 .verify_port = mpsc_verify_port,
1611 };
1612
1613 /*
1614 ******************************************************************************
1615 *
1616 * Console Interface Routines
1617 *
1618 ******************************************************************************
1619 */
1620
1621 #ifdef CONFIG_SERIAL_MPSC_CONSOLE
1622 static void
1623 mpsc_console_write(struct console *co, const char *s, uint count)
1624 {
1625 struct mpsc_port_info *pi = &mpsc_ports[co->index];
1626 u8 *bp, *dp, add_cr = 0;
1627 int i;
1628
1629 while (mpsc_sdma_tx_active(pi))
1630 udelay(100);
1631
1632 while (count > 0) {
1633 bp = dp = pi->txb + (pi->txr_head * MPSC_TXBE_SIZE);
1634
1635 for (i = 0; i < MPSC_TXBE_SIZE; i++) {
1636 if (count == 0)
1637 break;
1638
1639 if (add_cr) {
1640 *(dp++) = '\r';
1641 add_cr = 0;
1642 }
1643 else {
1644 *(dp++) = *s;
1645
1646 if (*(s++) == '\n') { /* add '\r' after '\n' */
1647 add_cr = 1;
1648 count++;
1649 }
1650 }
1651
1652 count--;
1653 }
1654
1655 dma_cache_sync(pi->port.dev, (void *) bp, MPSC_TXBE_SIZE, DMA_BIDIRECTIONAL);
1656 #if defined(CONFIG_PPC32) && !defined(CONFIG_NOT_COHERENT_CACHE)
1657 if (pi->cache_mgmt) /* GT642[46]0 Res #COMM-2 */
1658 flush_dcache_range((ulong)bp,
1659 (ulong)bp + MPSC_TXBE_SIZE);
1660 #endif
1661 mpsc_setup_tx_desc(pi, i, 0);
1662 pi->txr_head = (pi->txr_head + 1) & (MPSC_TXR_ENTRIES - 1);
1663 mpsc_sdma_start_tx(pi);
1664
1665 while (mpsc_sdma_tx_active(pi))
1666 udelay(100);
1667
1668 pi->txr_tail = (pi->txr_tail + 1) & (MPSC_TXR_ENTRIES - 1);
1669 }
1670
1671 return;
1672 }
1673
1674 static int __init
1675 mpsc_console_setup(struct console *co, char *options)
1676 {
1677 struct mpsc_port_info *pi;
1678 int baud, bits, parity, flow;
1679
1680 pr_debug("mpsc_console_setup[%d]: options: %s\n", co->index, options);
1681
1682 if (co->index >= MPSC_NUM_CTLRS)
1683 co->index = 0;
1684
1685 pi = &mpsc_ports[co->index];
1686
1687 baud = pi->default_baud;
1688 bits = pi->default_bits;
1689 parity = pi->default_parity;
1690 flow = pi->default_flow;
1691
1692 if (!pi->port.ops)
1693 return -ENODEV;
1694
1695 spin_lock_init(&pi->port.lock); /* Temporary fix--copied from 8250.c */
1696
1697 if (options)
1698 uart_parse_options(options, &baud, &parity, &bits, &flow);
1699
1700 return uart_set_options(&pi->port, co, baud, parity, bits, flow);
1701 }
1702
1703 static struct console mpsc_console = {
1704 .name = MPSC_DEV_NAME,
1705 .write = mpsc_console_write,
1706 .device = uart_console_device,
1707 .setup = mpsc_console_setup,
1708 .flags = CON_PRINTBUFFER,
1709 .index = -1,
1710 .data = &mpsc_reg,
1711 };
1712
1713 static int __init
1714 mpsc_late_console_init(void)
1715 {
1716 pr_debug("mpsc_late_console_init: Enter\n");
1717
1718 if (!(mpsc_console.flags & CON_ENABLED))
1719 register_console(&mpsc_console);
1720 return 0;
1721 }
1722
1723 late_initcall(mpsc_late_console_init);
1724
1725 #define MPSC_CONSOLE &mpsc_console
1726 #else
1727 #define MPSC_CONSOLE NULL
1728 #endif
1729 /*
1730 ******************************************************************************
1731 *
1732 * Dummy Platform Driver to extract & map shared register regions
1733 *
1734 ******************************************************************************
1735 */
1736 static void
1737 mpsc_resource_err(char *s)
1738 {
1739 printk(KERN_WARNING "MPSC: Platform device resource error in %s\n", s);
1740 return;
1741 }
1742
1743 static int
1744 mpsc_shared_map_regs(struct platform_device *pd)
1745 {
1746 struct resource *r;
1747
1748 if ((r = platform_get_resource(pd, IORESOURCE_MEM,
1749 MPSC_ROUTING_BASE_ORDER)) && request_mem_region(r->start,
1750 MPSC_ROUTING_REG_BLOCK_SIZE, "mpsc_routing_regs")) {
1751
1752 mpsc_shared_regs.mpsc_routing_base = ioremap(r->start,
1753 MPSC_ROUTING_REG_BLOCK_SIZE);
1754 mpsc_shared_regs.mpsc_routing_base_p = r->start;
1755 }
1756 else {
1757 mpsc_resource_err("MPSC routing base");
1758 return -ENOMEM;
1759 }
1760
1761 if ((r = platform_get_resource(pd, IORESOURCE_MEM,
1762 MPSC_SDMA_INTR_BASE_ORDER)) && request_mem_region(r->start,
1763 MPSC_SDMA_INTR_REG_BLOCK_SIZE, "sdma_intr_regs")) {
1764
1765 mpsc_shared_regs.sdma_intr_base = ioremap(r->start,
1766 MPSC_SDMA_INTR_REG_BLOCK_SIZE);
1767 mpsc_shared_regs.sdma_intr_base_p = r->start;
1768 }
1769 else {
1770 iounmap(mpsc_shared_regs.mpsc_routing_base);
1771 release_mem_region(mpsc_shared_regs.mpsc_routing_base_p,
1772 MPSC_ROUTING_REG_BLOCK_SIZE);
1773 mpsc_resource_err("SDMA intr base");
1774 return -ENOMEM;
1775 }
1776
1777 return 0;
1778 }
1779
1780 static void
1781 mpsc_shared_unmap_regs(void)
1782 {
1783 if (!mpsc_shared_regs.mpsc_routing_base) {
1784 iounmap(mpsc_shared_regs.mpsc_routing_base);
1785 release_mem_region(mpsc_shared_regs.mpsc_routing_base_p,
1786 MPSC_ROUTING_REG_BLOCK_SIZE);
1787 }
1788 if (!mpsc_shared_regs.sdma_intr_base) {
1789 iounmap(mpsc_shared_regs.sdma_intr_base);
1790 release_mem_region(mpsc_shared_regs.sdma_intr_base_p,
1791 MPSC_SDMA_INTR_REG_BLOCK_SIZE);
1792 }
1793
1794 mpsc_shared_regs.mpsc_routing_base = NULL;
1795 mpsc_shared_regs.sdma_intr_base = NULL;
1796
1797 mpsc_shared_regs.mpsc_routing_base_p = 0;
1798 mpsc_shared_regs.sdma_intr_base_p = 0;
1799
1800 return;
1801 }
1802
1803 static int
1804 mpsc_shared_drv_probe(struct platform_device *dev)
1805 {
1806 struct mpsc_shared_pdata *pdata;
1807 int rc = -ENODEV;
1808
1809 if (dev->id == 0) {
1810 if (!(rc = mpsc_shared_map_regs(dev))) {
1811 pdata = (struct mpsc_shared_pdata *)dev->dev.platform_data;
1812
1813 mpsc_shared_regs.MPSC_MRR_m = pdata->mrr_val;
1814 mpsc_shared_regs.MPSC_RCRR_m= pdata->rcrr_val;
1815 mpsc_shared_regs.MPSC_TCRR_m= pdata->tcrr_val;
1816 mpsc_shared_regs.SDMA_INTR_CAUSE_m =
1817 pdata->intr_cause_val;
1818 mpsc_shared_regs.SDMA_INTR_MASK_m =
1819 pdata->intr_mask_val;
1820
1821 rc = 0;
1822 }
1823 }
1824
1825 return rc;
1826 }
1827
1828 static int
1829 mpsc_shared_drv_remove(struct platform_device *dev)
1830 {
1831 int rc = -ENODEV;
1832
1833 if (dev->id == 0) {
1834 mpsc_shared_unmap_regs();
1835 mpsc_shared_regs.MPSC_MRR_m = 0;
1836 mpsc_shared_regs.MPSC_RCRR_m = 0;
1837 mpsc_shared_regs.MPSC_TCRR_m = 0;
1838 mpsc_shared_regs.SDMA_INTR_CAUSE_m = 0;
1839 mpsc_shared_regs.SDMA_INTR_MASK_m = 0;
1840 rc = 0;
1841 }
1842
1843 return rc;
1844 }
1845
1846 static struct platform_driver mpsc_shared_driver = {
1847 .probe = mpsc_shared_drv_probe,
1848 .remove = mpsc_shared_drv_remove,
1849 .driver = {
1850 .name = MPSC_SHARED_NAME,
1851 },
1852 };
1853
1854 /*
1855 ******************************************************************************
1856 *
1857 * Driver Interface Routines
1858 *
1859 ******************************************************************************
1860 */
1861 static struct uart_driver mpsc_reg = {
1862 .owner = THIS_MODULE,
1863 .driver_name = MPSC_DRIVER_NAME,
1864 .dev_name = MPSC_DEV_NAME,
1865 .major = MPSC_MAJOR,
1866 .minor = MPSC_MINOR_START,
1867 .nr = MPSC_NUM_CTLRS,
1868 .cons = MPSC_CONSOLE,
1869 };
1870
1871 static int
1872 mpsc_drv_map_regs(struct mpsc_port_info *pi, struct platform_device *pd)
1873 {
1874 struct resource *r;
1875
1876 if ((r = platform_get_resource(pd, IORESOURCE_MEM, MPSC_BASE_ORDER)) &&
1877 request_mem_region(r->start, MPSC_REG_BLOCK_SIZE, "mpsc_regs")){
1878
1879 pi->mpsc_base = ioremap(r->start, MPSC_REG_BLOCK_SIZE);
1880 pi->mpsc_base_p = r->start;
1881 }
1882 else {
1883 mpsc_resource_err("MPSC base");
1884 return -ENOMEM;
1885 }
1886
1887 if ((r = platform_get_resource(pd, IORESOURCE_MEM,
1888 MPSC_SDMA_BASE_ORDER)) && request_mem_region(r->start,
1889 MPSC_SDMA_REG_BLOCK_SIZE, "sdma_regs")) {
1890
1891 pi->sdma_base = ioremap(r->start,MPSC_SDMA_REG_BLOCK_SIZE);
1892 pi->sdma_base_p = r->start;
1893 }
1894 else {
1895 mpsc_resource_err("SDMA base");
1896 if (pi->mpsc_base) {
1897 iounmap(pi->mpsc_base);
1898 pi->mpsc_base = NULL;
1899 }
1900 return -ENOMEM;
1901 }
1902
1903 if ((r = platform_get_resource(pd,IORESOURCE_MEM,MPSC_BRG_BASE_ORDER))
1904 && request_mem_region(r->start, MPSC_BRG_REG_BLOCK_SIZE,
1905 "brg_regs")) {
1906
1907 pi->brg_base = ioremap(r->start, MPSC_BRG_REG_BLOCK_SIZE);
1908 pi->brg_base_p = r->start;
1909 }
1910 else {
1911 mpsc_resource_err("BRG base");
1912 if (pi->mpsc_base) {
1913 iounmap(pi->mpsc_base);
1914 pi->mpsc_base = NULL;
1915 }
1916 if (pi->sdma_base) {
1917 iounmap(pi->sdma_base);
1918 pi->sdma_base = NULL;
1919 }
1920 return -ENOMEM;
1921 }
1922
1923 return 0;
1924 }
1925
1926 static void
1927 mpsc_drv_unmap_regs(struct mpsc_port_info *pi)
1928 {
1929 if (!pi->mpsc_base) {
1930 iounmap(pi->mpsc_base);
1931 release_mem_region(pi->mpsc_base_p, MPSC_REG_BLOCK_SIZE);
1932 }
1933 if (!pi->sdma_base) {
1934 iounmap(pi->sdma_base);
1935 release_mem_region(pi->sdma_base_p, MPSC_SDMA_REG_BLOCK_SIZE);
1936 }
1937 if (!pi->brg_base) {
1938 iounmap(pi->brg_base);
1939 release_mem_region(pi->brg_base_p, MPSC_BRG_REG_BLOCK_SIZE);
1940 }
1941
1942 pi->mpsc_base = NULL;
1943 pi->sdma_base = NULL;
1944 pi->brg_base = NULL;
1945
1946 pi->mpsc_base_p = 0;
1947 pi->sdma_base_p = 0;
1948 pi->brg_base_p = 0;
1949
1950 return;
1951 }
1952
1953 static void
1954 mpsc_drv_get_platform_data(struct mpsc_port_info *pi,
1955 struct platform_device *pd, int num)
1956 {
1957 struct mpsc_pdata *pdata;
1958
1959 pdata = (struct mpsc_pdata *)pd->dev.platform_data;
1960
1961 pi->port.uartclk = pdata->brg_clk_freq;
1962 pi->port.iotype = UPIO_MEM;
1963 pi->port.line = num;
1964 pi->port.type = PORT_MPSC;
1965 pi->port.fifosize = MPSC_TXBE_SIZE;
1966 pi->port.membase = pi->mpsc_base;
1967 pi->port.mapbase = (ulong)pi->mpsc_base;
1968 pi->port.ops = &mpsc_pops;
1969
1970 pi->mirror_regs = pdata->mirror_regs;
1971 pi->cache_mgmt = pdata->cache_mgmt;
1972 pi->brg_can_tune = pdata->brg_can_tune;
1973 pi->brg_clk_src = pdata->brg_clk_src;
1974 pi->mpsc_max_idle = pdata->max_idle;
1975 pi->default_baud = pdata->default_baud;
1976 pi->default_bits = pdata->default_bits;
1977 pi->default_parity = pdata->default_parity;
1978 pi->default_flow = pdata->default_flow;
1979
1980 /* Initial values of mirrored regs */
1981 pi->MPSC_CHR_1_m = pdata->chr_1_val;
1982 pi->MPSC_CHR_2_m = pdata->chr_2_val;
1983 pi->MPSC_CHR_10_m = pdata->chr_10_val;
1984 pi->MPSC_MPCR_m = pdata->mpcr_val;
1985 pi->BRG_BCR_m = pdata->bcr_val;
1986
1987 pi->shared_regs = &mpsc_shared_regs;
1988
1989 pi->port.irq = platform_get_irq(pd, 0);
1990
1991 return;
1992 }
1993
1994 static int
1995 mpsc_drv_probe(struct platform_device *dev)
1996 {
1997 struct mpsc_port_info *pi;
1998 int rc = -ENODEV;
1999
2000 pr_debug("mpsc_drv_probe: Adding MPSC %d\n", dev->id);
2001
2002 if (dev->id < MPSC_NUM_CTLRS) {
2003 pi = &mpsc_ports[dev->id];
2004
2005 if (!(rc = mpsc_drv_map_regs(pi, dev))) {
2006 mpsc_drv_get_platform_data(pi, dev, dev->id);
2007
2008 if (!(rc = mpsc_make_ready(pi)))
2009 if (!(rc = uart_add_one_port(&mpsc_reg,
2010 &pi->port)))
2011 rc = 0;
2012 else {
2013 mpsc_release_port(
2014 (struct uart_port *)pi);
2015 mpsc_drv_unmap_regs(pi);
2016 }
2017 else
2018 mpsc_drv_unmap_regs(pi);
2019 }
2020 }
2021
2022 return rc;
2023 }
2024
2025 static int
2026 mpsc_drv_remove(struct platform_device *dev)
2027 {
2028 pr_debug("mpsc_drv_exit: Removing MPSC %d\n", dev->id);
2029
2030 if (dev->id < MPSC_NUM_CTLRS) {
2031 uart_remove_one_port(&mpsc_reg, &mpsc_ports[dev->id].port);
2032 mpsc_release_port((struct uart_port *)&mpsc_ports[dev->id].port);
2033 mpsc_drv_unmap_regs(&mpsc_ports[dev->id]);
2034 return 0;
2035 }
2036 else
2037 return -ENODEV;
2038 }
2039
2040 static struct platform_driver mpsc_driver = {
2041 .probe = mpsc_drv_probe,
2042 .remove = mpsc_drv_remove,
2043 .driver = {
2044 .name = MPSC_CTLR_NAME,
2045 },
2046 };
2047
2048 static int __init
2049 mpsc_drv_init(void)
2050 {
2051 int rc;
2052
2053 printk(KERN_INFO "Serial: MPSC driver $Revision: 1.00 $\n");
2054
2055 memset(mpsc_ports, 0, sizeof(mpsc_ports));
2056 memset(&mpsc_shared_regs, 0, sizeof(mpsc_shared_regs));
2057
2058 if (!(rc = uart_register_driver(&mpsc_reg))) {
2059 if (!(rc = platform_driver_register(&mpsc_shared_driver))) {
2060 if ((rc = platform_driver_register(&mpsc_driver))) {
2061 platform_driver_unregister(&mpsc_shared_driver);
2062 uart_unregister_driver(&mpsc_reg);
2063 }
2064 }
2065 else
2066 uart_unregister_driver(&mpsc_reg);
2067 }
2068
2069 return rc;
2070
2071 }
2072
2073 static void __exit
2074 mpsc_drv_exit(void)
2075 {
2076 platform_driver_unregister(&mpsc_driver);
2077 platform_driver_unregister(&mpsc_shared_driver);
2078 uart_unregister_driver(&mpsc_reg);
2079 memset(mpsc_ports, 0, sizeof(mpsc_ports));
2080 memset(&mpsc_shared_regs, 0, sizeof(mpsc_shared_regs));
2081 return;
2082 }
2083
2084 module_init(mpsc_drv_init);
2085 module_exit(mpsc_drv_exit);
2086
2087 MODULE_AUTHOR("Mark A. Greer <mgreer@mvista.com>");
2088 MODULE_DESCRIPTION("Generic Marvell MPSC serial/UART driver $Revision: 1.00 $");
2089 MODULE_VERSION(MPSC_VERSION);
2090 MODULE_LICENSE("GPL");
2091 MODULE_ALIAS_CHARDEV_MAJOR(MPSC_MAJOR);
Linux with added FPC-III support