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epca.c: reformat comments and coding style improvements
[linux-2.6/openmoko-kernel.git] / drivers / serial / mpsc.c
blob4d643c9266578d86defb7e9a5b05a138dd161a5b
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 #define MPSC_NUM_CTLRS 2
78
79 /*
80 * Descriptors and buffers must be cache line aligned.
81 * Buffers lengths must be multiple of cache line size.
82 * Number of Tx & Rx descriptors must be powers of 2.
83 */
84 #define MPSC_RXR_ENTRIES 32
85 #define MPSC_RXRE_SIZE dma_get_cache_alignment()
86 #define MPSC_RXR_SIZE (MPSC_RXR_ENTRIES * MPSC_RXRE_SIZE)
87 #define MPSC_RXBE_SIZE dma_get_cache_alignment()
88 #define MPSC_RXB_SIZE (MPSC_RXR_ENTRIES * MPSC_RXBE_SIZE)
89
90 #define MPSC_TXR_ENTRIES 32
91 #define MPSC_TXRE_SIZE dma_get_cache_alignment()
92 #define MPSC_TXR_SIZE (MPSC_TXR_ENTRIES * MPSC_TXRE_SIZE)
93 #define MPSC_TXBE_SIZE dma_get_cache_alignment()
94 #define MPSC_TXB_SIZE (MPSC_TXR_ENTRIES * MPSC_TXBE_SIZE)
95
96 #define MPSC_DMA_ALLOC_SIZE (MPSC_RXR_SIZE + MPSC_RXB_SIZE + MPSC_TXR_SIZE \
97 + MPSC_TXB_SIZE + dma_get_cache_alignment() /* for alignment */)
98
99 /* Rx and Tx Ring entry descriptors -- assume entry size is <= cacheline size */
100 struct mpsc_rx_desc {
101 u16 bufsize;
102 u16 bytecnt;
103 u32 cmdstat;
104 u32 link;
105 u32 buf_ptr;
106 } __attribute((packed));
107
108 struct mpsc_tx_desc {
109 u16 bytecnt;
110 u16 shadow;
111 u32 cmdstat;
112 u32 link;
113 u32 buf_ptr;
114 } __attribute((packed));
115
116 /*
117 * Some regs that have the erratum that you can't read them are are shared
118 * between the two MPSC controllers. This struct contains those shared regs.
119 */
120 struct mpsc_shared_regs {
121 phys_addr_t mpsc_routing_base_p;
122 phys_addr_t sdma_intr_base_p;
123
124 void __iomem *mpsc_routing_base;
125 void __iomem *sdma_intr_base;
126
127 u32 MPSC_MRR_m;
128 u32 MPSC_RCRR_m;
129 u32 MPSC_TCRR_m;
130 u32 SDMA_INTR_CAUSE_m;
131 u32 SDMA_INTR_MASK_m;
132 };
133
134 /* The main driver data structure */
135 struct mpsc_port_info {
136 struct uart_port port; /* Overlay uart_port structure */
137
138 /* Internal driver state for this ctlr */
139 u8 ready;
140 u8 rcv_data;
141 tcflag_t c_iflag; /* save termios->c_iflag */
142 tcflag_t c_cflag; /* save termios->c_cflag */
143
144 /* Info passed in from platform */
145 u8 mirror_regs; /* Need to mirror regs? */
146 u8 cache_mgmt; /* Need manual cache mgmt? */
147 u8 brg_can_tune; /* BRG has baud tuning? */
148 u32 brg_clk_src;
149 u16 mpsc_max_idle;
150 int default_baud;
151 int default_bits;
152 int default_parity;
153 int default_flow;
154
155 /* Physical addresses of various blocks of registers (from platform) */
156 phys_addr_t mpsc_base_p;
157 phys_addr_t sdma_base_p;
158 phys_addr_t brg_base_p;
159
160 /* Virtual addresses of various blocks of registers (from platform) */
161 void __iomem *mpsc_base;
162 void __iomem *sdma_base;
163 void __iomem *brg_base;
164
165 /* Descriptor ring and buffer allocations */
166 void *dma_region;
167 dma_addr_t dma_region_p;
168
169 dma_addr_t rxr; /* Rx descriptor ring */
170 dma_addr_t rxr_p; /* Phys addr of rxr */
171 u8 *rxb; /* Rx Ring I/O buf */
172 u8 *rxb_p; /* Phys addr of rxb */
173 u32 rxr_posn; /* First desc w/ Rx data */
174
175 dma_addr_t txr; /* Tx descriptor ring */
176 dma_addr_t txr_p; /* Phys addr of txr */
177 u8 *txb; /* Tx Ring I/O buf */
178 u8 *txb_p; /* Phys addr of txb */
179 int txr_head; /* Where new data goes */
180 int txr_tail; /* Where sent data comes off */
181 spinlock_t tx_lock; /* transmit lock */
182
183 /* Mirrored values of regs we can't read (if 'mirror_regs' set) */
184 u32 MPSC_MPCR_m;
185 u32 MPSC_CHR_1_m;
186 u32 MPSC_CHR_2_m;
187 u32 MPSC_CHR_10_m;
188 u32 BRG_BCR_m;
189 struct mpsc_shared_regs *shared_regs;
190 };
191
192 /* Hooks to platform-specific code */
193 int mpsc_platform_register_driver(void);
194 void mpsc_platform_unregister_driver(void);
195
196 /* Hooks back in to mpsc common to be called by platform-specific code */
197 struct mpsc_port_info *mpsc_device_probe(int index);
198 struct mpsc_port_info *mpsc_device_remove(int index);
199
200 /* Main MPSC Configuration Register Offsets */
201 #define MPSC_MMCRL 0x0000
202 #define MPSC_MMCRH 0x0004
203 #define MPSC_MPCR 0x0008
204 #define MPSC_CHR_1 0x000c
205 #define MPSC_CHR_2 0x0010
206 #define MPSC_CHR_3 0x0014
207 #define MPSC_CHR_4 0x0018
208 #define MPSC_CHR_5 0x001c
209 #define MPSC_CHR_6 0x0020
210 #define MPSC_CHR_7 0x0024
211 #define MPSC_CHR_8 0x0028
212 #define MPSC_CHR_9 0x002c
213 #define MPSC_CHR_10 0x0030
214 #define MPSC_CHR_11 0x0034
215
216 #define MPSC_MPCR_FRZ (1 << 9)
217 #define MPSC_MPCR_CL_5 0
218 #define MPSC_MPCR_CL_6 1
219 #define MPSC_MPCR_CL_7 2
220 #define MPSC_MPCR_CL_8 3
221 #define MPSC_MPCR_SBL_1 0
222 #define MPSC_MPCR_SBL_2 1
223
224 #define MPSC_CHR_2_TEV (1<<1)
225 #define MPSC_CHR_2_TA (1<<7)
226 #define MPSC_CHR_2_TTCS (1<<9)
227 #define MPSC_CHR_2_REV (1<<17)
228 #define MPSC_CHR_2_RA (1<<23)
229 #define MPSC_CHR_2_CRD (1<<25)
230 #define MPSC_CHR_2_EH (1<<31)
231 #define MPSC_CHR_2_PAR_ODD 0
232 #define MPSC_CHR_2_PAR_SPACE 1
233 #define MPSC_CHR_2_PAR_EVEN 2
234 #define MPSC_CHR_2_PAR_MARK 3
235
236 /* MPSC Signal Routing */
237 #define MPSC_MRR 0x0000
238 #define MPSC_RCRR 0x0004
239 #define MPSC_TCRR 0x0008
240
241 /* Serial DMA Controller Interface Registers */
242 #define SDMA_SDC 0x0000
243 #define SDMA_SDCM 0x0008
244 #define SDMA_RX_DESC 0x0800
245 #define SDMA_RX_BUF_PTR 0x0808
246 #define SDMA_SCRDP 0x0810
247 #define SDMA_TX_DESC 0x0c00
248 #define SDMA_SCTDP 0x0c10
249 #define SDMA_SFTDP 0x0c14
250
251 #define SDMA_DESC_CMDSTAT_PE (1<<0)
252 #define SDMA_DESC_CMDSTAT_CDL (1<<1)
253 #define SDMA_DESC_CMDSTAT_FR (1<<3)
254 #define SDMA_DESC_CMDSTAT_OR (1<<6)
255 #define SDMA_DESC_CMDSTAT_BR (1<<9)
256 #define SDMA_DESC_CMDSTAT_MI (1<<10)
257 #define SDMA_DESC_CMDSTAT_A (1<<11)
258 #define SDMA_DESC_CMDSTAT_AM (1<<12)
259 #define SDMA_DESC_CMDSTAT_CT (1<<13)
260 #define SDMA_DESC_CMDSTAT_C (1<<14)
261 #define SDMA_DESC_CMDSTAT_ES (1<<15)
262 #define SDMA_DESC_CMDSTAT_L (1<<16)
263 #define SDMA_DESC_CMDSTAT_F (1<<17)
264 #define SDMA_DESC_CMDSTAT_P (1<<18)
265 #define SDMA_DESC_CMDSTAT_EI (1<<23)
266 #define SDMA_DESC_CMDSTAT_O (1<<31)
267
268 #define SDMA_DESC_DFLT (SDMA_DESC_CMDSTAT_O \
269 | SDMA_DESC_CMDSTAT_EI)
270
271 #define SDMA_SDC_RFT (1<<0)
272 #define SDMA_SDC_SFM (1<<1)
273 #define SDMA_SDC_BLMR (1<<6)
274 #define SDMA_SDC_BLMT (1<<7)
275 #define SDMA_SDC_POVR (1<<8)
276 #define SDMA_SDC_RIFB (1<<9)
277
278 #define SDMA_SDCM_ERD (1<<7)
279 #define SDMA_SDCM_AR (1<<15)
280 #define SDMA_SDCM_STD (1<<16)
281 #define SDMA_SDCM_TXD (1<<23)
282 #define SDMA_SDCM_AT (1<<31)
283
284 #define SDMA_0_CAUSE_RXBUF (1<<0)
285 #define SDMA_0_CAUSE_RXERR (1<<1)
286 #define SDMA_0_CAUSE_TXBUF (1<<2)
287 #define SDMA_0_CAUSE_TXEND (1<<3)
288 #define SDMA_1_CAUSE_RXBUF (1<<8)
289 #define SDMA_1_CAUSE_RXERR (1<<9)
290 #define SDMA_1_CAUSE_TXBUF (1<<10)
291 #define SDMA_1_CAUSE_TXEND (1<<11)
292
293 #define SDMA_CAUSE_RX_MASK (SDMA_0_CAUSE_RXBUF | SDMA_0_CAUSE_RXERR \
294 | SDMA_1_CAUSE_RXBUF | SDMA_1_CAUSE_RXERR)
295 #define SDMA_CAUSE_TX_MASK (SDMA_0_CAUSE_TXBUF | SDMA_0_CAUSE_TXEND \
296 | SDMA_1_CAUSE_TXBUF | SDMA_1_CAUSE_TXEND)
297
298 /* SDMA Interrupt registers */
299 #define SDMA_INTR_CAUSE 0x0000
300 #define SDMA_INTR_MASK 0x0080
301
302 /* Baud Rate Generator Interface Registers */
303 #define BRG_BCR 0x0000
304 #define BRG_BTR 0x0004
305
306 /*
307 * Define how this driver is known to the outside (we've been assigned a
308 * range on the "Low-density serial ports" major).
309 */
310 #define MPSC_MAJOR 204
311 #define MPSC_MINOR_START 44
312 #define MPSC_DRIVER_NAME "MPSC"
313 #define MPSC_DEV_NAME "ttyMM"
314 #define MPSC_VERSION "1.00"
315
316 static struct mpsc_port_info mpsc_ports[MPSC_NUM_CTLRS];
317 static struct mpsc_shared_regs mpsc_shared_regs;
318 static struct uart_driver mpsc_reg;
319
320 static void mpsc_start_rx(struct mpsc_port_info *pi);
321 static void mpsc_free_ring_mem(struct mpsc_port_info *pi);
322 static void mpsc_release_port(struct uart_port *port);
323 /*
324 ******************************************************************************
325 *
326 * Baud Rate Generator Routines (BRG)
327 *
328 ******************************************************************************
329 */
330 static void mpsc_brg_init(struct mpsc_port_info *pi, u32 clk_src)
331 {
332 u32 v;
333
334 v = (pi->mirror_regs) ? pi->BRG_BCR_m : readl(pi->brg_base + BRG_BCR);
335 v = (v & ~(0xf << 18)) | ((clk_src & 0xf) << 18);
336
337 if (pi->brg_can_tune)
338 v &= ~(1 << 25);
339
340 if (pi->mirror_regs)
341 pi->BRG_BCR_m = v;
342 writel(v, pi->brg_base + BRG_BCR);
343
344 writel(readl(pi->brg_base + BRG_BTR) & 0xffff0000,
345 pi->brg_base + BRG_BTR);
346 }
347
348 static void mpsc_brg_enable(struct mpsc_port_info *pi)
349 {
350 u32 v;
351
352 v = (pi->mirror_regs) ? pi->BRG_BCR_m : readl(pi->brg_base + BRG_BCR);
353 v |= (1 << 16);
354
355 if (pi->mirror_regs)
356 pi->BRG_BCR_m = v;
357 writel(v, pi->brg_base + BRG_BCR);
358 }
359
360 static void mpsc_brg_disable(struct mpsc_port_info *pi)
361 {
362 u32 v;
363
364 v = (pi->mirror_regs) ? pi->BRG_BCR_m : readl(pi->brg_base + BRG_BCR);
365 v &= ~(1 << 16);
366
367 if (pi->mirror_regs)
368 pi->BRG_BCR_m = v;
369 writel(v, pi->brg_base + BRG_BCR);
370 }
371
372 /*
373 * To set the baud, we adjust the CDV field in the BRG_BCR reg.
374 * From manual: Baud = clk / ((CDV+1)*2) ==> CDV = (clk / (baud*2)) - 1.
375 * However, the input clock is divided by 16 in the MPSC b/c of how
376 * 'MPSC_MMCRH' was set up so we have to divide the 'clk' used in our
377 * calculation by 16 to account for that. So the real calculation
378 * that accounts for the way the mpsc is set up is:
379 * CDV = (clk / (baud*2*16)) - 1 ==> CDV = (clk / (baud << 5)) - 1.
380 */
381 static void mpsc_set_baudrate(struct mpsc_port_info *pi, u32 baud)
382 {
383 u32 cdv = (pi->port.uartclk / (baud << 5)) - 1;
384 u32 v;
385
386 mpsc_brg_disable(pi);
387 v = (pi->mirror_regs) ? pi->BRG_BCR_m : readl(pi->brg_base + BRG_BCR);
388 v = (v & 0xffff0000) | (cdv & 0xffff);
389
390 if (pi->mirror_regs)
391 pi->BRG_BCR_m = v;
392 writel(v, pi->brg_base + BRG_BCR);
393 mpsc_brg_enable(pi);
394 }
395
396 /*
397 ******************************************************************************
398 *
399 * Serial DMA Routines (SDMA)
400 *
401 ******************************************************************************
402 */
403
404 static void mpsc_sdma_burstsize(struct mpsc_port_info *pi, u32 burst_size)
405 {
406 u32 v;
407
408 pr_debug("mpsc_sdma_burstsize[%d]: burst_size: %d\n",
409 pi->port.line, burst_size);
410
411 burst_size >>= 3; /* Divide by 8 b/c reg values are 8-byte chunks */
412
413 if (burst_size < 2)
414 v = 0x0; /* 1 64-bit word */
415 else if (burst_size < 4)
416 v = 0x1; /* 2 64-bit words */
417 else if (burst_size < 8)
418 v = 0x2; /* 4 64-bit words */
419 else
420 v = 0x3; /* 8 64-bit words */
421
422 writel((readl(pi->sdma_base + SDMA_SDC) & (0x3 << 12)) | (v << 12),
423 pi->sdma_base + SDMA_SDC);
424 }
425
426 static void mpsc_sdma_init(struct mpsc_port_info *pi, u32 burst_size)
427 {
428 pr_debug("mpsc_sdma_init[%d]: burst_size: %d\n", pi->port.line,
429 burst_size);
430
431 writel((readl(pi->sdma_base + SDMA_SDC) & 0x3ff) | 0x03f,
432 pi->sdma_base + SDMA_SDC);
433 mpsc_sdma_burstsize(pi, burst_size);
434 }
435
436 static u32 mpsc_sdma_intr_mask(struct mpsc_port_info *pi, u32 mask)
437 {
438 u32 old, v;
439
440 pr_debug("mpsc_sdma_intr_mask[%d]: mask: 0x%x\n", pi->port.line, mask);
441
442 old = v = (pi->mirror_regs) ? pi->shared_regs->SDMA_INTR_MASK_m :
443 readl(pi->shared_regs->sdma_intr_base + SDMA_INTR_MASK);
444
445 mask &= 0xf;
446 if (pi->port.line)
447 mask <<= 8;
448 v &= ~mask;
449
450 if (pi->mirror_regs)
451 pi->shared_regs->SDMA_INTR_MASK_m = v;
452 writel(v, pi->shared_regs->sdma_intr_base + SDMA_INTR_MASK);
453
454 if (pi->port.line)
455 old >>= 8;
456 return old & 0xf;
457 }
458
459 static void mpsc_sdma_intr_unmask(struct mpsc_port_info *pi, u32 mask)
460 {
461 u32 v;
462
463 pr_debug("mpsc_sdma_intr_unmask[%d]: mask: 0x%x\n", pi->port.line,mask);
464
465 v = (pi->mirror_regs) ? pi->shared_regs->SDMA_INTR_MASK_m
466 : readl(pi->shared_regs->sdma_intr_base + SDMA_INTR_MASK);
467
468 mask &= 0xf;
469 if (pi->port.line)
470 mask <<= 8;
471 v |= mask;
472
473 if (pi->mirror_regs)
474 pi->shared_regs->SDMA_INTR_MASK_m = v;
475 writel(v, pi->shared_regs->sdma_intr_base + SDMA_INTR_MASK);
476 }
477
478 static void mpsc_sdma_intr_ack(struct mpsc_port_info *pi)
479 {
480 pr_debug("mpsc_sdma_intr_ack[%d]: Acknowledging IRQ\n", pi->port.line);
481
482 if (pi->mirror_regs)
483 pi->shared_regs->SDMA_INTR_CAUSE_m = 0;
484 writeb(0x00, pi->shared_regs->sdma_intr_base + SDMA_INTR_CAUSE
485 + pi->port.line);
486 }
487
488 static void mpsc_sdma_set_rx_ring(struct mpsc_port_info *pi,
489 struct mpsc_rx_desc *rxre_p)
490 {
491 pr_debug("mpsc_sdma_set_rx_ring[%d]: rxre_p: 0x%x\n",
492 pi->port.line, (u32)rxre_p);
493
494 writel((u32)rxre_p, pi->sdma_base + SDMA_SCRDP);
495 }
496
497 static void mpsc_sdma_set_tx_ring(struct mpsc_port_info *pi,
498 struct mpsc_tx_desc *txre_p)
499 {
500 writel((u32)txre_p, pi->sdma_base + SDMA_SFTDP);
501 writel((u32)txre_p, pi->sdma_base + SDMA_SCTDP);
502 }
503
504 static void mpsc_sdma_cmd(struct mpsc_port_info *pi, u32 val)
505 {
506 u32 v;
507
508 v = readl(pi->sdma_base + SDMA_SDCM);
509 if (val)
510 v |= val;
511 else
512 v = 0;
513 wmb();
514 writel(v, pi->sdma_base + SDMA_SDCM);
515 wmb();
516 }
517
518 static uint mpsc_sdma_tx_active(struct mpsc_port_info *pi)
519 {
520 return readl(pi->sdma_base + SDMA_SDCM) & SDMA_SDCM_TXD;
521 }
522
523 static void mpsc_sdma_start_tx(struct mpsc_port_info *pi)
524 {
525 struct mpsc_tx_desc *txre, *txre_p;
526
527 /* If tx isn't running & there's a desc ready to go, start it */
528 if (!mpsc_sdma_tx_active(pi)) {
529 txre = (struct mpsc_tx_desc *)(pi->txr
530 + (pi->txr_tail * MPSC_TXRE_SIZE));
531 dma_cache_sync(pi->port.dev, (void *)txre, MPSC_TXRE_SIZE,
532 DMA_FROM_DEVICE);
533 #if defined(CONFIG_PPC32) && !defined(CONFIG_NOT_COHERENT_CACHE)
534 if (pi->cache_mgmt) /* GT642[46]0 Res #COMM-2 */
535 invalidate_dcache_range((ulong)txre,
536 (ulong)txre + MPSC_TXRE_SIZE);
537 #endif
538
539 if (be32_to_cpu(txre->cmdstat) & SDMA_DESC_CMDSTAT_O) {
540 txre_p = (struct mpsc_tx_desc *)
541 (pi->txr_p + (pi->txr_tail * MPSC_TXRE_SIZE));
542
543 mpsc_sdma_set_tx_ring(pi, txre_p);
544 mpsc_sdma_cmd(pi, SDMA_SDCM_STD | SDMA_SDCM_TXD);
545 }
546 }
547 }
548
549 static void mpsc_sdma_stop(struct mpsc_port_info *pi)
550 {
551 pr_debug("mpsc_sdma_stop[%d]: Stopping SDMA\n", pi->port.line);
552
553 /* Abort any SDMA transfers */
554 mpsc_sdma_cmd(pi, 0);
555 mpsc_sdma_cmd(pi, SDMA_SDCM_AR | SDMA_SDCM_AT);
556
557 /* Clear the SDMA current and first TX and RX pointers */
558 mpsc_sdma_set_tx_ring(pi, NULL);
559 mpsc_sdma_set_rx_ring(pi, NULL);
560
561 /* Disable interrupts */
562 mpsc_sdma_intr_mask(pi, 0xf);
563 mpsc_sdma_intr_ack(pi);
564 }
565
566 /*
567 ******************************************************************************
568 *
569 * Multi-Protocol Serial Controller Routines (MPSC)
570 *
571 ******************************************************************************
572 */
573
574 static void mpsc_hw_init(struct mpsc_port_info *pi)
575 {
576 u32 v;
577
578 pr_debug("mpsc_hw_init[%d]: Initializing hardware\n", pi->port.line);
579
580 /* Set up clock routing */
581 if (pi->mirror_regs) {
582 v = pi->shared_regs->MPSC_MRR_m;
583 v &= ~0x1c7;
584 pi->shared_regs->MPSC_MRR_m = v;
585 writel(v, pi->shared_regs->mpsc_routing_base + MPSC_MRR);
586
587 v = pi->shared_regs->MPSC_RCRR_m;
588 v = (v & ~0xf0f) | 0x100;
589 pi->shared_regs->MPSC_RCRR_m = v;
590 writel(v, pi->shared_regs->mpsc_routing_base + MPSC_RCRR);
591
592 v = pi->shared_regs->MPSC_TCRR_m;
593 v = (v & ~0xf0f) | 0x100;
594 pi->shared_regs->MPSC_TCRR_m = v;
595 writel(v, pi->shared_regs->mpsc_routing_base + MPSC_TCRR);
596 } else {
597 v = readl(pi->shared_regs->mpsc_routing_base + MPSC_MRR);
598 v &= ~0x1c7;
599 writel(v, pi->shared_regs->mpsc_routing_base + MPSC_MRR);
600
601 v = readl(pi->shared_regs->mpsc_routing_base + MPSC_RCRR);
602 v = (v & ~0xf0f) | 0x100;
603 writel(v, pi->shared_regs->mpsc_routing_base + MPSC_RCRR);
604
605 v = readl(pi->shared_regs->mpsc_routing_base + MPSC_TCRR);
606 v = (v & ~0xf0f) | 0x100;
607 writel(v, pi->shared_regs->mpsc_routing_base + MPSC_TCRR);
608 }
609
610 /* Put MPSC in UART mode & enabel Tx/Rx egines */
611 writel(0x000004c4, pi->mpsc_base + MPSC_MMCRL);
612
613 /* No preamble, 16x divider, low-latency, */
614 writel(0x04400400, pi->mpsc_base + MPSC_MMCRH);
615
616 if (pi->mirror_regs) {
617 pi->MPSC_CHR_1_m = 0;
618 pi->MPSC_CHR_2_m = 0;
619 }
620 writel(0, pi->mpsc_base + MPSC_CHR_1);
621 writel(0, pi->mpsc_base + MPSC_CHR_2);
622 writel(pi->mpsc_max_idle, pi->mpsc_base + MPSC_CHR_3);
623 writel(0, pi->mpsc_base + MPSC_CHR_4);
624 writel(0, pi->mpsc_base + MPSC_CHR_5);
625 writel(0, pi->mpsc_base + MPSC_CHR_6);
626 writel(0, pi->mpsc_base + MPSC_CHR_7);
627 writel(0, pi->mpsc_base + MPSC_CHR_8);
628 writel(0, pi->mpsc_base + MPSC_CHR_9);
629 writel(0, pi->mpsc_base + MPSC_CHR_10);
630 }
631
632 static void mpsc_enter_hunt(struct mpsc_port_info *pi)
633 {
634 pr_debug("mpsc_enter_hunt[%d]: Hunting...\n", pi->port.line);
635
636 if (pi->mirror_regs) {
637 writel(pi->MPSC_CHR_2_m | MPSC_CHR_2_EH,
638 pi->mpsc_base + MPSC_CHR_2);
639 /* Erratum prevents reading CHR_2 so just delay for a while */
640 udelay(100);
641 } else {
642 writel(readl(pi->mpsc_base + MPSC_CHR_2) | MPSC_CHR_2_EH,
643 pi->mpsc_base + MPSC_CHR_2);
644
645 while (readl(pi->mpsc_base + MPSC_CHR_2) & MPSC_CHR_2_EH)
646 udelay(10);
647 }
648 }
649
650 static void mpsc_freeze(struct mpsc_port_info *pi)
651 {
652 u32 v;
653
654 pr_debug("mpsc_freeze[%d]: Freezing\n", pi->port.line);
655
656 v = (pi->mirror_regs) ? pi->MPSC_MPCR_m :
657 readl(pi->mpsc_base + MPSC_MPCR);
658 v |= MPSC_MPCR_FRZ;
659
660 if (pi->mirror_regs)
661 pi->MPSC_MPCR_m = v;
662 writel(v, pi->mpsc_base + MPSC_MPCR);
663 }
664
665 static void mpsc_unfreeze(struct mpsc_port_info *pi)
666 {
667 u32 v;
668
669 v = (pi->mirror_regs) ? pi->MPSC_MPCR_m :
670 readl(pi->mpsc_base + MPSC_MPCR);
671 v &= ~MPSC_MPCR_FRZ;
672
673 if (pi->mirror_regs)
674 pi->MPSC_MPCR_m = v;
675 writel(v, pi->mpsc_base + MPSC_MPCR);
676
677 pr_debug("mpsc_unfreeze[%d]: Unfrozen\n", pi->port.line);
678 }
679
680 static void mpsc_set_char_length(struct mpsc_port_info *pi, u32 len)
681 {
682 u32 v;
683
684 pr_debug("mpsc_set_char_length[%d]: char len: %d\n", pi->port.line,len);
685
686 v = (pi->mirror_regs) ? pi->MPSC_MPCR_m :
687 readl(pi->mpsc_base + MPSC_MPCR);
688 v = (v & ~(0x3 << 12)) | ((len & 0x3) << 12);
689
690 if (pi->mirror_regs)
691 pi->MPSC_MPCR_m = v;
692 writel(v, pi->mpsc_base + MPSC_MPCR);
693 }
694
695 static void mpsc_set_stop_bit_length(struct mpsc_port_info *pi, u32 len)
696 {
697 u32 v;
698
699 pr_debug("mpsc_set_stop_bit_length[%d]: stop bits: %d\n",
700 pi->port.line, len);
701
702 v = (pi->mirror_regs) ? pi->MPSC_MPCR_m :
703 readl(pi->mpsc_base + MPSC_MPCR);
704
705 v = (v & ~(1 << 14)) | ((len & 0x1) << 14);
706
707 if (pi->mirror_regs)
708 pi->MPSC_MPCR_m = v;
709 writel(v, pi->mpsc_base + MPSC_MPCR);
710 }
711
712 static void mpsc_set_parity(struct mpsc_port_info *pi, u32 p)
713 {
714 u32 v;
715
716 pr_debug("mpsc_set_parity[%d]: parity bits: 0x%x\n", pi->port.line, p);
717
718 v = (pi->mirror_regs) ? pi->MPSC_CHR_2_m :
719 readl(pi->mpsc_base + MPSC_CHR_2);
720
721 p &= 0x3;
722 v = (v & ~0xc000c) | (p << 18) | (p << 2);
723
724 if (pi->mirror_regs)
725 pi->MPSC_CHR_2_m = v;
726 writel(v, pi->mpsc_base + MPSC_CHR_2);
727 }
728
729 /*
730 ******************************************************************************
731 *
732 * Driver Init Routines
733 *
734 ******************************************************************************
735 */
736
737 static void mpsc_init_hw(struct mpsc_port_info *pi)
738 {
739 pr_debug("mpsc_init_hw[%d]: Initializing\n", pi->port.line);
740
741 mpsc_brg_init(pi, pi->brg_clk_src);
742 mpsc_brg_enable(pi);
743 mpsc_sdma_init(pi, dma_get_cache_alignment()); /* burst a cacheline */
744 mpsc_sdma_stop(pi);
745 mpsc_hw_init(pi);
746 }
747
748 static int mpsc_alloc_ring_mem(struct mpsc_port_info *pi)
749 {
750 int rc = 0;
751
752 pr_debug("mpsc_alloc_ring_mem[%d]: Allocating ring mem\n",
753 pi->port.line);
754
755 if (!pi->dma_region) {
756 if (!dma_supported(pi->port.dev, 0xffffffff)) {
757 printk(KERN_ERR "MPSC: Inadequate DMA support\n");
758 rc = -ENXIO;
759 } else if ((pi->dma_region = dma_alloc_noncoherent(pi->port.dev,
760 MPSC_DMA_ALLOC_SIZE,
761 &pi->dma_region_p, GFP_KERNEL))
762 == NULL) {
763 printk(KERN_ERR "MPSC: Can't alloc Desc region\n");
764 rc = -ENOMEM;
765 }
766 }
767
768 return rc;
769 }
770
771 static void mpsc_free_ring_mem(struct mpsc_port_info *pi)
772 {
773 pr_debug("mpsc_free_ring_mem[%d]: Freeing ring mem\n", pi->port.line);
774
775 if (pi->dma_region) {
776 dma_free_noncoherent(pi->port.dev, MPSC_DMA_ALLOC_SIZE,
777 pi->dma_region, pi->dma_region_p);
778 pi->dma_region = NULL;
779 pi->dma_region_p = (dma_addr_t)NULL;
780 }
781 }
782
783 static void mpsc_init_rings(struct mpsc_port_info *pi)
784 {
785 struct mpsc_rx_desc *rxre;
786 struct mpsc_tx_desc *txre;
787 dma_addr_t dp, dp_p;
788 u8 *bp, *bp_p;
789 int i;
790
791 pr_debug("mpsc_init_rings[%d]: Initializing rings\n", pi->port.line);
792
793 BUG_ON(pi->dma_region == NULL);
794
795 memset(pi->dma_region, 0, MPSC_DMA_ALLOC_SIZE);
796
797 /*
798 * Descriptors & buffers are multiples of cacheline size and must be
799 * cacheline aligned.
800 */
801 dp = ALIGN((u32)pi->dma_region, dma_get_cache_alignment());
802 dp_p = ALIGN((u32)pi->dma_region_p, dma_get_cache_alignment());
803
804 /*
805 * Partition dma region into rx ring descriptor, rx buffers,
806 * tx ring descriptors, and tx buffers.
807 */
808 pi->rxr = dp;
809 pi->rxr_p = dp_p;
810 dp += MPSC_RXR_SIZE;
811 dp_p += MPSC_RXR_SIZE;
812
813 pi->rxb = (u8 *)dp;
814 pi->rxb_p = (u8 *)dp_p;
815 dp += MPSC_RXB_SIZE;
816 dp_p += MPSC_RXB_SIZE;
817
818 pi->rxr_posn = 0;
819
820 pi->txr = dp;
821 pi->txr_p = dp_p;
822 dp += MPSC_TXR_SIZE;
823 dp_p += MPSC_TXR_SIZE;
824
825 pi->txb = (u8 *)dp;
826 pi->txb_p = (u8 *)dp_p;
827
828 pi->txr_head = 0;
829 pi->txr_tail = 0;
830
831 /* Init rx ring descriptors */
832 dp = pi->rxr;
833 dp_p = pi->rxr_p;
834 bp = pi->rxb;
835 bp_p = pi->rxb_p;
836
837 for (i = 0; i < MPSC_RXR_ENTRIES; i++) {
838 rxre = (struct mpsc_rx_desc *)dp;
839
840 rxre->bufsize = cpu_to_be16(MPSC_RXBE_SIZE);
841 rxre->bytecnt = cpu_to_be16(0);
842 rxre->cmdstat = cpu_to_be32(SDMA_DESC_CMDSTAT_O
843 | SDMA_DESC_CMDSTAT_EI | SDMA_DESC_CMDSTAT_F
844 | SDMA_DESC_CMDSTAT_L);
845 rxre->link = cpu_to_be32(dp_p + MPSC_RXRE_SIZE);
846 rxre->buf_ptr = cpu_to_be32(bp_p);
847
848 dp += MPSC_RXRE_SIZE;
849 dp_p += MPSC_RXRE_SIZE;
850 bp += MPSC_RXBE_SIZE;
851 bp_p += MPSC_RXBE_SIZE;
852 }
853 rxre->link = cpu_to_be32(pi->rxr_p); /* Wrap last back to first */
854
855 /* Init tx ring descriptors */
856 dp = pi->txr;
857 dp_p = pi->txr_p;
858 bp = pi->txb;
859 bp_p = pi->txb_p;
860
861 for (i = 0; i < MPSC_TXR_ENTRIES; i++) {
862 txre = (struct mpsc_tx_desc *)dp;
863
864 txre->link = cpu_to_be32(dp_p + MPSC_TXRE_SIZE);
865 txre->buf_ptr = cpu_to_be32(bp_p);
866
867 dp += MPSC_TXRE_SIZE;
868 dp_p += MPSC_TXRE_SIZE;
869 bp += MPSC_TXBE_SIZE;
870 bp_p += MPSC_TXBE_SIZE;
871 }
872 txre->link = cpu_to_be32(pi->txr_p); /* Wrap last back to first */
873
874 dma_cache_sync(pi->port.dev, (void *)pi->dma_region,
875 MPSC_DMA_ALLOC_SIZE, DMA_BIDIRECTIONAL);
876 #if defined(CONFIG_PPC32) && !defined(CONFIG_NOT_COHERENT_CACHE)
877 if (pi->cache_mgmt) /* GT642[46]0 Res #COMM-2 */
878 flush_dcache_range((ulong)pi->dma_region,
879 (ulong)pi->dma_region
880 + MPSC_DMA_ALLOC_SIZE);
881 #endif
882
883 return;
884 }
885
886 static void mpsc_uninit_rings(struct mpsc_port_info *pi)
887 {
888 pr_debug("mpsc_uninit_rings[%d]: Uninitializing rings\n",pi->port.line);
889
890 BUG_ON(pi->dma_region == NULL);
891
892 pi->rxr = 0;
893 pi->rxr_p = 0;
894 pi->rxb = NULL;
895 pi->rxb_p = NULL;
896 pi->rxr_posn = 0;
897
898 pi->txr = 0;
899 pi->txr_p = 0;
900 pi->txb = NULL;
901 pi->txb_p = NULL;
902 pi->txr_head = 0;
903 pi->txr_tail = 0;
904 }
905
906 static int mpsc_make_ready(struct mpsc_port_info *pi)
907 {
908 int rc;
909
910 pr_debug("mpsc_make_ready[%d]: Making cltr ready\n", pi->port.line);
911
912 if (!pi->ready) {
913 mpsc_init_hw(pi);
914 if ((rc = mpsc_alloc_ring_mem(pi)))
915 return rc;
916 mpsc_init_rings(pi);
917 pi->ready = 1;
918 }
919
920 return 0;
921 }
922
923 /*
924 ******************************************************************************
925 *
926 * Interrupt Handling Routines
927 *
928 ******************************************************************************
929 */
930
931 static int mpsc_rx_intr(struct mpsc_port_info *pi)
932 {
933 struct mpsc_rx_desc *rxre;
934 struct tty_struct *tty = pi->port.info->tty;
935 u32 cmdstat, bytes_in, i;
936 int rc = 0;
937 u8 *bp;
938 char flag = TTY_NORMAL;
939
940 pr_debug("mpsc_rx_intr[%d]: Handling Rx intr\n", pi->port.line);
941
942 rxre = (struct mpsc_rx_desc *)(pi->rxr + (pi->rxr_posn*MPSC_RXRE_SIZE));
943
944 dma_cache_sync(pi->port.dev, (void *)rxre, MPSC_RXRE_SIZE,
945 DMA_FROM_DEVICE);
946 #if defined(CONFIG_PPC32) && !defined(CONFIG_NOT_COHERENT_CACHE)
947 if (pi->cache_mgmt) /* GT642[46]0 Res #COMM-2 */
948 invalidate_dcache_range((ulong)rxre,
949 (ulong)rxre + MPSC_RXRE_SIZE);
950 #endif
951
952 /*
953 * Loop through Rx descriptors handling ones that have been completed.
954 */
955 while (!((cmdstat = be32_to_cpu(rxre->cmdstat))
956 & SDMA_DESC_CMDSTAT_O)) {
957 bytes_in = be16_to_cpu(rxre->bytecnt);
958
959 /* Following use of tty struct directly is deprecated */
960 if (unlikely(tty_buffer_request_room(tty, bytes_in)
961 < bytes_in)) {
962 if (tty->low_latency)
963 tty_flip_buffer_push(tty);
964 /*
965 * If this failed then we will throw away the bytes
966 * but must do so to clear interrupts.
967 */
968 }
969
970 bp = pi->rxb + (pi->rxr_posn * MPSC_RXBE_SIZE);
971 dma_cache_sync(pi->port.dev, (void *)bp, MPSC_RXBE_SIZE,
972 DMA_FROM_DEVICE);
973 #if defined(CONFIG_PPC32) && !defined(CONFIG_NOT_COHERENT_CACHE)
974 if (pi->cache_mgmt) /* GT642[46]0 Res #COMM-2 */
975 invalidate_dcache_range((ulong)bp,
976 (ulong)bp + MPSC_RXBE_SIZE);
977 #endif
978
979 /*
980 * Other than for parity error, the manual provides little
981 * info on what data will be in a frame flagged by any of
982 * these errors. For parity error, it is the last byte in
983 * the buffer that had the error. As for the rest, I guess
984 * we'll assume there is no data in the buffer.
985 * If there is...it gets lost.
986 */
987 if (unlikely(cmdstat & (SDMA_DESC_CMDSTAT_BR
988 | SDMA_DESC_CMDSTAT_FR
989 | SDMA_DESC_CMDSTAT_OR))) {
990
991 pi->port.icount.rx++;
992
993 if (cmdstat & SDMA_DESC_CMDSTAT_BR) { /* Break */
994 pi->port.icount.brk++;
995
996 if (uart_handle_break(&pi->port))
997 goto next_frame;
998 } else if (cmdstat & SDMA_DESC_CMDSTAT_FR) {
999 pi->port.icount.frame++;
1000 } else if (cmdstat & SDMA_DESC_CMDSTAT_OR) {
1001 pi->port.icount.overrun++;
1002 }
1003
1004 cmdstat &= pi->port.read_status_mask;
1005
1006 if (cmdstat & SDMA_DESC_CMDSTAT_BR)
1007 flag = TTY_BREAK;
1008 else if (cmdstat & SDMA_DESC_CMDSTAT_FR)
1009 flag = TTY_FRAME;
1010 else if (cmdstat & SDMA_DESC_CMDSTAT_OR)
1011 flag = TTY_OVERRUN;
1012 else if (cmdstat & SDMA_DESC_CMDSTAT_PE)
1013 flag = TTY_PARITY;
1014 }
1015
1016 if (uart_handle_sysrq_char(&pi->port, *bp)) {
1017 bp++;
1018 bytes_in--;
1019 goto next_frame;
1020 }
1021
1022 if ((unlikely(cmdstat & (SDMA_DESC_CMDSTAT_BR
1023 | SDMA_DESC_CMDSTAT_FR
1024 | SDMA_DESC_CMDSTAT_OR)))
1025 && !(cmdstat & pi->port.ignore_status_mask)) {
1026 tty_insert_flip_char(tty, *bp, flag);
1027 } else {
1028 for (i=0; i<bytes_in; i++)
1029 tty_insert_flip_char(tty, *bp++, TTY_NORMAL);
1030
1031 pi->port.icount.rx += bytes_in;
1032 }
1033
1034 next_frame:
1035 rxre->bytecnt = cpu_to_be16(0);
1036 wmb();
1037 rxre->cmdstat = cpu_to_be32(SDMA_DESC_CMDSTAT_O
1038 | SDMA_DESC_CMDSTAT_EI | SDMA_DESC_CMDSTAT_F
1039 | SDMA_DESC_CMDSTAT_L);
1040 wmb();
1041 dma_cache_sync(pi->port.dev, (void *)rxre, MPSC_RXRE_SIZE,
1042 DMA_BIDIRECTIONAL);
1043 #if defined(CONFIG_PPC32) && !defined(CONFIG_NOT_COHERENT_CACHE)
1044 if (pi->cache_mgmt) /* GT642[46]0 Res #COMM-2 */
1045 flush_dcache_range((ulong)rxre,
1046 (ulong)rxre + MPSC_RXRE_SIZE);
1047 #endif
1048
1049 /* Advance to next descriptor */
1050 pi->rxr_posn = (pi->rxr_posn + 1) & (MPSC_RXR_ENTRIES - 1);
1051 rxre = (struct mpsc_rx_desc *)
1052 (pi->rxr + (pi->rxr_posn * MPSC_RXRE_SIZE));
1053 dma_cache_sync(pi->port.dev, (void *)rxre, MPSC_RXRE_SIZE,
1054 DMA_FROM_DEVICE);
1055 #if defined(CONFIG_PPC32) && !defined(CONFIG_NOT_COHERENT_CACHE)
1056 if (pi->cache_mgmt) /* GT642[46]0 Res #COMM-2 */
1057 invalidate_dcache_range((ulong)rxre,
1058 (ulong)rxre + MPSC_RXRE_SIZE);
1059 #endif
1060 rc = 1;
1061 }
1062
1063 /* Restart rx engine, if its stopped */
1064 if ((readl(pi->sdma_base + SDMA_SDCM) & SDMA_SDCM_ERD) == 0)
1065 mpsc_start_rx(pi);
1066
1067 tty_flip_buffer_push(tty);
1068 return rc;
1069 }
1070
1071 static void mpsc_setup_tx_desc(struct mpsc_port_info *pi, u32 count, u32 intr)
1072 {
1073 struct mpsc_tx_desc *txre;
1074
1075 txre = (struct mpsc_tx_desc *)(pi->txr
1076 + (pi->txr_head * MPSC_TXRE_SIZE));
1077
1078 txre->bytecnt = cpu_to_be16(count);
1079 txre->shadow = txre->bytecnt;
1080 wmb(); /* ensure cmdstat is last field updated */
1081 txre->cmdstat = cpu_to_be32(SDMA_DESC_CMDSTAT_O | SDMA_DESC_CMDSTAT_F
1082 | SDMA_DESC_CMDSTAT_L
1083 | ((intr) ? SDMA_DESC_CMDSTAT_EI : 0));
1084 wmb();
1085 dma_cache_sync(pi->port.dev, (void *)txre, MPSC_TXRE_SIZE,
1086 DMA_BIDIRECTIONAL);
1087 #if defined(CONFIG_PPC32) && !defined(CONFIG_NOT_COHERENT_CACHE)
1088 if (pi->cache_mgmt) /* GT642[46]0 Res #COMM-2 */
1089 flush_dcache_range((ulong)txre,
1090 (ulong)txre + MPSC_TXRE_SIZE);
1091 #endif
1092 }
1093
1094 static void mpsc_copy_tx_data(struct mpsc_port_info *pi)
1095 {
1096 struct circ_buf *xmit = &pi->port.info->xmit;
1097 u8 *bp;
1098 u32 i;
1099
1100 /* Make sure the desc ring isn't full */
1101 while (CIRC_CNT(pi->txr_head, pi->txr_tail, MPSC_TXR_ENTRIES)
1102 < (MPSC_TXR_ENTRIES - 1)) {
1103 if (pi->port.x_char) {
1104 /*
1105 * Ideally, we should use the TCS field in
1106 * CHR_1 to put the x_char out immediately but
1107 * errata prevents us from being able to read
1108 * CHR_2 to know that its safe to write to
1109 * CHR_1. Instead, just put it in-band with
1110 * all the other Tx data.
1111 */
1112 bp = pi->txb + (pi->txr_head * MPSC_TXBE_SIZE);
1113 *bp = pi->port.x_char;
1114 pi->port.x_char = 0;
1115 i = 1;
1116 } else if (!uart_circ_empty(xmit)
1117 && !uart_tx_stopped(&pi->port)) {
1118 i = min((u32)MPSC_TXBE_SIZE,
1119 (u32)uart_circ_chars_pending(xmit));
1120 i = min(i, (u32)CIRC_CNT_TO_END(xmit->head, xmit->tail,
1121 UART_XMIT_SIZE));
1122 bp = pi->txb + (pi->txr_head * MPSC_TXBE_SIZE);
1123 memcpy(bp, &xmit->buf[xmit->tail], i);
1124 xmit->tail = (xmit->tail + i) & (UART_XMIT_SIZE - 1);
1125
1126 if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
1127 uart_write_wakeup(&pi->port);
1128 } else { /* All tx data copied into ring bufs */
1129 return;
1130 }
1131
1132 dma_cache_sync(pi->port.dev, (void *)bp, MPSC_TXBE_SIZE,
1133 DMA_BIDIRECTIONAL);
1134 #if defined(CONFIG_PPC32) && !defined(CONFIG_NOT_COHERENT_CACHE)
1135 if (pi->cache_mgmt) /* GT642[46]0 Res #COMM-2 */
1136 flush_dcache_range((ulong)bp,
1137 (ulong)bp + MPSC_TXBE_SIZE);
1138 #endif
1139 mpsc_setup_tx_desc(pi, i, 1);
1140
1141 /* Advance to next descriptor */
1142 pi->txr_head = (pi->txr_head + 1) & (MPSC_TXR_ENTRIES - 1);
1143 }
1144 }
1145
1146 static int mpsc_tx_intr(struct mpsc_port_info *pi)
1147 {
1148 struct mpsc_tx_desc *txre;
1149 int rc = 0;
1150 unsigned long iflags;
1151
1152 spin_lock_irqsave(&pi->tx_lock, iflags);
1153
1154 if (!mpsc_sdma_tx_active(pi)) {
1155 txre = (struct mpsc_tx_desc *)(pi->txr
1156 + (pi->txr_tail * MPSC_TXRE_SIZE));
1157
1158 dma_cache_sync(pi->port.dev, (void *)txre, MPSC_TXRE_SIZE,
1159 DMA_FROM_DEVICE);
1160 #if defined(CONFIG_PPC32) && !defined(CONFIG_NOT_COHERENT_CACHE)
1161 if (pi->cache_mgmt) /* GT642[46]0 Res #COMM-2 */
1162 invalidate_dcache_range((ulong)txre,
1163 (ulong)txre + MPSC_TXRE_SIZE);
1164 #endif
1165
1166 while (!(be32_to_cpu(txre->cmdstat) & SDMA_DESC_CMDSTAT_O)) {
1167 rc = 1;
1168 pi->port.icount.tx += be16_to_cpu(txre->bytecnt);
1169 pi->txr_tail = (pi->txr_tail+1) & (MPSC_TXR_ENTRIES-1);
1170
1171 /* If no more data to tx, fall out of loop */
1172 if (pi->txr_head == pi->txr_tail)
1173 break;
1174
1175 txre = (struct mpsc_tx_desc *)(pi->txr
1176 + (pi->txr_tail * MPSC_TXRE_SIZE));
1177 dma_cache_sync(pi->port.dev, (void *)txre,
1178 MPSC_TXRE_SIZE, DMA_FROM_DEVICE);
1179 #if defined(CONFIG_PPC32) && !defined(CONFIG_NOT_COHERENT_CACHE)
1180 if (pi->cache_mgmt) /* GT642[46]0 Res #COMM-2 */
1181 invalidate_dcache_range((ulong)txre,
1182 (ulong)txre + MPSC_TXRE_SIZE);
1183 #endif
1184 }
1185
1186 mpsc_copy_tx_data(pi);
1187 mpsc_sdma_start_tx(pi); /* start next desc if ready */
1188 }
1189
1190 spin_unlock_irqrestore(&pi->tx_lock, iflags);
1191 return rc;
1192 }
1193
1194 /*
1195 * This is the driver's interrupt handler. To avoid a race, we first clear
1196 * the interrupt, then handle any completed Rx/Tx descriptors. When done
1197 * handling those descriptors, we restart the Rx/Tx engines if they're stopped.
1198 */
1199 static irqreturn_t mpsc_sdma_intr(int irq, void *dev_id)
1200 {
1201 struct mpsc_port_info *pi = dev_id;
1202 ulong iflags;
1203 int rc = IRQ_NONE;
1204
1205 pr_debug("mpsc_sdma_intr[%d]: SDMA Interrupt Received\n",pi->port.line);
1206
1207 spin_lock_irqsave(&pi->port.lock, iflags);
1208 mpsc_sdma_intr_ack(pi);
1209 if (mpsc_rx_intr(pi))
1210 rc = IRQ_HANDLED;
1211 if (mpsc_tx_intr(pi))
1212 rc = IRQ_HANDLED;
1213 spin_unlock_irqrestore(&pi->port.lock, iflags);
1214
1215 pr_debug("mpsc_sdma_intr[%d]: SDMA Interrupt Handled\n", pi->port.line);
1216 return rc;
1217 }
1218
1219 /*
1220 ******************************************************************************
1221 *
1222 * serial_core.c Interface routines
1223 *
1224 ******************************************************************************
1225 */
1226 static uint mpsc_tx_empty(struct uart_port *port)
1227 {
1228 struct mpsc_port_info *pi = (struct mpsc_port_info *)port;
1229 ulong iflags;
1230 uint rc;
1231
1232 spin_lock_irqsave(&pi->port.lock, iflags);
1233 rc = mpsc_sdma_tx_active(pi) ? 0 : TIOCSER_TEMT;
1234 spin_unlock_irqrestore(&pi->port.lock, iflags);
1235
1236 return rc;
1237 }
1238
1239 static void mpsc_set_mctrl(struct uart_port *port, uint mctrl)
1240 {
1241 /* Have no way to set modem control lines AFAICT */
1242 }
1243
1244 static uint mpsc_get_mctrl(struct uart_port *port)
1245 {
1246 struct mpsc_port_info *pi = (struct mpsc_port_info *)port;
1247 u32 mflags, status;
1248
1249 status = (pi->mirror_regs) ? pi->MPSC_CHR_10_m
1250 : readl(pi->mpsc_base + MPSC_CHR_10);
1251
1252 mflags = 0;
1253 if (status & 0x1)
1254 mflags |= TIOCM_CTS;
1255 if (status & 0x2)
1256 mflags |= TIOCM_CAR;
1257
1258 return mflags | TIOCM_DSR; /* No way to tell if DSR asserted */
1259 }
1260
1261 static void mpsc_stop_tx(struct uart_port *port)
1262 {
1263 struct mpsc_port_info *pi = (struct mpsc_port_info *)port;
1264
1265 pr_debug("mpsc_stop_tx[%d]\n", port->line);
1266
1267 mpsc_freeze(pi);
1268 }
1269
1270 static void mpsc_start_tx(struct uart_port *port)
1271 {
1272 struct mpsc_port_info *pi = (struct mpsc_port_info *)port;
1273 unsigned long iflags;
1274
1275 spin_lock_irqsave(&pi->tx_lock, iflags);
1276
1277 mpsc_unfreeze(pi);
1278 mpsc_copy_tx_data(pi);
1279 mpsc_sdma_start_tx(pi);
1280
1281 spin_unlock_irqrestore(&pi->tx_lock, iflags);
1282
1283 pr_debug("mpsc_start_tx[%d]\n", port->line);
1284 }
1285
1286 static void mpsc_start_rx(struct mpsc_port_info *pi)
1287 {
1288 pr_debug("mpsc_start_rx[%d]: Starting...\n", pi->port.line);
1289
1290 if (pi->rcv_data) {
1291 mpsc_enter_hunt(pi);
1292 mpsc_sdma_cmd(pi, SDMA_SDCM_ERD);
1293 }
1294 }
1295
1296 static void mpsc_stop_rx(struct uart_port *port)
1297 {
1298 struct mpsc_port_info *pi = (struct mpsc_port_info *)port;
1299
1300 pr_debug("mpsc_stop_rx[%d]: Stopping...\n", port->line);
1301
1302 if (pi->mirror_regs) {
1303 writel(pi->MPSC_CHR_2_m | MPSC_CHR_2_RA,
1304 pi->mpsc_base + MPSC_CHR_2);
1305 /* Erratum prevents reading CHR_2 so just delay for a while */
1306 udelay(100);
1307 } else {
1308 writel(readl(pi->mpsc_base + MPSC_CHR_2) | MPSC_CHR_2_RA,
1309 pi->mpsc_base + MPSC_CHR_2);
1310
1311 while (readl(pi->mpsc_base + MPSC_CHR_2) & MPSC_CHR_2_RA)
1312 udelay(10);
1313 }
1314
1315 mpsc_sdma_cmd(pi, SDMA_SDCM_AR);
1316 }
1317
1318 static void mpsc_enable_ms(struct uart_port *port)
1319 {
1320 }
1321
1322 static void mpsc_break_ctl(struct uart_port *port, int ctl)
1323 {
1324 struct mpsc_port_info *pi = (struct mpsc_port_info *)port;
1325 ulong flags;
1326 u32 v;
1327
1328 v = ctl ? 0x00ff0000 : 0;
1329
1330 spin_lock_irqsave(&pi->port.lock, flags);
1331 if (pi->mirror_regs)
1332 pi->MPSC_CHR_1_m = v;
1333 writel(v, pi->mpsc_base + MPSC_CHR_1);
1334 spin_unlock_irqrestore(&pi->port.lock, flags);
1335 }
1336
1337 static int mpsc_startup(struct uart_port *port)
1338 {
1339 struct mpsc_port_info *pi = (struct mpsc_port_info *)port;
1340 u32 flag = 0;
1341 int rc;
1342
1343 pr_debug("mpsc_startup[%d]: Starting up MPSC, irq: %d\n",
1344 port->line, pi->port.irq);
1345
1346 if ((rc = mpsc_make_ready(pi)) == 0) {
1347 /* Setup IRQ handler */
1348 mpsc_sdma_intr_ack(pi);
1349
1350 /* If irq's are shared, need to set flag */
1351 if (mpsc_ports[0].port.irq == mpsc_ports[1].port.irq)
1352 flag = IRQF_SHARED;
1353
1354 if (request_irq(pi->port.irq, mpsc_sdma_intr, flag,
1355 "mpsc-sdma", pi))
1356 printk(KERN_ERR "MPSC: Can't get SDMA IRQ %d\n",
1357 pi->port.irq);
1358
1359 mpsc_sdma_intr_unmask(pi, 0xf);
1360 mpsc_sdma_set_rx_ring(pi, (struct mpsc_rx_desc *)(pi->rxr_p
1361 + (pi->rxr_posn * MPSC_RXRE_SIZE)));
1362 }
1363
1364 return rc;
1365 }
1366
1367 static void mpsc_shutdown(struct uart_port *port)
1368 {
1369 struct mpsc_port_info *pi = (struct mpsc_port_info *)port;
1370
1371 pr_debug("mpsc_shutdown[%d]: Shutting down MPSC\n", port->line);
1372
1373 mpsc_sdma_stop(pi);
1374 free_irq(pi->port.irq, pi);
1375 }
1376
1377 static void mpsc_set_termios(struct uart_port *port, struct ktermios *termios,
1378 struct ktermios *old)
1379 {
1380 struct mpsc_port_info *pi = (struct mpsc_port_info *)port;
1381 u32 baud;
1382 ulong flags;
1383 u32 chr_bits, stop_bits, par;
1384
1385 pi->c_iflag = termios->c_iflag;
1386 pi->c_cflag = termios->c_cflag;
1387
1388 switch (termios->c_cflag & CSIZE) {
1389 case CS5:
1390 chr_bits = MPSC_MPCR_CL_5;
1391 break;
1392 case CS6:
1393 chr_bits = MPSC_MPCR_CL_6;
1394 break;
1395 case CS7:
1396 chr_bits = MPSC_MPCR_CL_7;
1397 break;
1398 case CS8:
1399 default:
1400 chr_bits = MPSC_MPCR_CL_8;
1401 break;
1402 }
1403
1404 if (termios->c_cflag & CSTOPB)
1405 stop_bits = MPSC_MPCR_SBL_2;
1406 else
1407 stop_bits = MPSC_MPCR_SBL_1;
1408
1409 par = MPSC_CHR_2_PAR_EVEN;
1410 if (termios->c_cflag & PARENB)
1411 if (termios->c_cflag & PARODD)
1412 par = MPSC_CHR_2_PAR_ODD;
1413 #ifdef CMSPAR
1414 if (termios->c_cflag & CMSPAR) {
1415 if (termios->c_cflag & PARODD)
1416 par = MPSC_CHR_2_PAR_MARK;
1417 else
1418 par = MPSC_CHR_2_PAR_SPACE;
1419 }
1420 #endif
1421
1422 baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk);
1423
1424 spin_lock_irqsave(&pi->port.lock, flags);
1425
1426 uart_update_timeout(port, termios->c_cflag, baud);
1427
1428 mpsc_set_char_length(pi, chr_bits);
1429 mpsc_set_stop_bit_length(pi, stop_bits);
1430 mpsc_set_parity(pi, par);
1431 mpsc_set_baudrate(pi, baud);
1432
1433 /* Characters/events to read */
1434 pi->port.read_status_mask = SDMA_DESC_CMDSTAT_OR;
1435
1436 if (termios->c_iflag & INPCK)
1437 pi->port.read_status_mask |= SDMA_DESC_CMDSTAT_PE
1438 | SDMA_DESC_CMDSTAT_FR;
1439
1440 if (termios->c_iflag & (BRKINT | PARMRK))
1441 pi->port.read_status_mask |= SDMA_DESC_CMDSTAT_BR;
1442
1443 /* Characters/events to ignore */
1444 pi->port.ignore_status_mask = 0;
1445
1446 if (termios->c_iflag & IGNPAR)
1447 pi->port.ignore_status_mask |= SDMA_DESC_CMDSTAT_PE
1448 | SDMA_DESC_CMDSTAT_FR;
1449
1450 if (termios->c_iflag & IGNBRK) {
1451 pi->port.ignore_status_mask |= SDMA_DESC_CMDSTAT_BR;
1452
1453 if (termios->c_iflag & IGNPAR)
1454 pi->port.ignore_status_mask |= SDMA_DESC_CMDSTAT_OR;
1455 }
1456
1457 if ((termios->c_cflag & CREAD)) {
1458 if (!pi->rcv_data) {
1459 pi->rcv_data = 1;
1460 mpsc_start_rx(pi);
1461 }
1462 } else if (pi->rcv_data) {
1463 mpsc_stop_rx(port);
1464 pi->rcv_data = 0;
1465 }
1466
1467 spin_unlock_irqrestore(&pi->port.lock, flags);
1468 }
1469
1470 static const char *mpsc_type(struct uart_port *port)
1471 {
1472 pr_debug("mpsc_type[%d]: port type: %s\n", port->line,MPSC_DRIVER_NAME);
1473 return MPSC_DRIVER_NAME;
1474 }
1475
1476 static int mpsc_request_port(struct uart_port *port)
1477 {
1478 /* Should make chip/platform specific call */
1479 return 0;
1480 }
1481
1482 static void mpsc_release_port(struct uart_port *port)
1483 {
1484 struct mpsc_port_info *pi = (struct mpsc_port_info *)port;
1485
1486 if (pi->ready) {
1487 mpsc_uninit_rings(pi);
1488 mpsc_free_ring_mem(pi);
1489 pi->ready = 0;
1490 }
1491 }
1492
1493 static void mpsc_config_port(struct uart_port *port, int flags)
1494 {
1495 }
1496
1497 static int mpsc_verify_port(struct uart_port *port, struct serial_struct *ser)
1498 {
1499 struct mpsc_port_info *pi = (struct mpsc_port_info *)port;
1500 int rc = 0;
1501
1502 pr_debug("mpsc_verify_port[%d]: Verifying port data\n", pi->port.line);
1503
1504 if (ser->type != PORT_UNKNOWN && ser->type != PORT_MPSC)
1505 rc = -EINVAL;
1506 else if (pi->port.irq != ser->irq)
1507 rc = -EINVAL;
1508 else if (ser->io_type != SERIAL_IO_MEM)
1509 rc = -EINVAL;
1510 else if (pi->port.uartclk / 16 != ser->baud_base) /* Not sure */
1511 rc = -EINVAL;
1512 else if ((void *)pi->port.mapbase != ser->iomem_base)
1513 rc = -EINVAL;
1514 else if (pi->port.iobase != ser->port)
1515 rc = -EINVAL;
1516 else if (ser->hub6 != 0)
1517 rc = -EINVAL;
1518
1519 return rc;
1520 }
1521
1522 static struct uart_ops mpsc_pops = {
1523 .tx_empty = mpsc_tx_empty,
1524 .set_mctrl = mpsc_set_mctrl,
1525 .get_mctrl = mpsc_get_mctrl,
1526 .stop_tx = mpsc_stop_tx,
1527 .start_tx = mpsc_start_tx,
1528 .stop_rx = mpsc_stop_rx,
1529 .enable_ms = mpsc_enable_ms,
1530 .break_ctl = mpsc_break_ctl,
1531 .startup = mpsc_startup,
1532 .shutdown = mpsc_shutdown,
1533 .set_termios = mpsc_set_termios,
1534 .type = mpsc_type,
1535 .release_port = mpsc_release_port,
1536 .request_port = mpsc_request_port,
1537 .config_port = mpsc_config_port,
1538 .verify_port = mpsc_verify_port,
1539 };
1540
1541 /*
1542 ******************************************************************************
1543 *
1544 * Console Interface Routines
1545 *
1546 ******************************************************************************
1547 */
1548
1549 #ifdef CONFIG_SERIAL_MPSC_CONSOLE
1550 static void mpsc_console_write(struct console *co, const char *s, uint count)
1551 {
1552 struct mpsc_port_info *pi = &mpsc_ports[co->index];
1553 u8 *bp, *dp, add_cr = 0;
1554 int i;
1555 unsigned long iflags;
1556
1557 spin_lock_irqsave(&pi->tx_lock, iflags);
1558
1559 while (pi->txr_head != pi->txr_tail) {
1560 while (mpsc_sdma_tx_active(pi))
1561 udelay(100);
1562 mpsc_sdma_intr_ack(pi);
1563 mpsc_tx_intr(pi);
1564 }
1565
1566 while (mpsc_sdma_tx_active(pi))
1567 udelay(100);
1568
1569 while (count > 0) {
1570 bp = dp = pi->txb + (pi->txr_head * MPSC_TXBE_SIZE);
1571
1572 for (i = 0; i < MPSC_TXBE_SIZE; i++) {
1573 if (count == 0)
1574 break;
1575
1576 if (add_cr) {
1577 *(dp++) = '\r';
1578 add_cr = 0;
1579 } else {
1580 *(dp++) = *s;
1581
1582 if (*(s++) == '\n') { /* add '\r' after '\n' */
1583 add_cr = 1;
1584 count++;
1585 }
1586 }
1587
1588 count--;
1589 }
1590
1591 dma_cache_sync(pi->port.dev, (void *)bp, MPSC_TXBE_SIZE,
1592 DMA_BIDIRECTIONAL);
1593 #if defined(CONFIG_PPC32) && !defined(CONFIG_NOT_COHERENT_CACHE)
1594 if (pi->cache_mgmt) /* GT642[46]0 Res #COMM-2 */
1595 flush_dcache_range((ulong)bp,
1596 (ulong)bp + MPSC_TXBE_SIZE);
1597 #endif
1598 mpsc_setup_tx_desc(pi, i, 0);
1599 pi->txr_head = (pi->txr_head + 1) & (MPSC_TXR_ENTRIES - 1);
1600 mpsc_sdma_start_tx(pi);
1601
1602 while (mpsc_sdma_tx_active(pi))
1603 udelay(100);
1604
1605 pi->txr_tail = (pi->txr_tail + 1) & (MPSC_TXR_ENTRIES - 1);
1606 }
1607
1608 spin_unlock_irqrestore(&pi->tx_lock, iflags);
1609 }
1610
1611 static int __init mpsc_console_setup(struct console *co, char *options)
1612 {
1613 struct mpsc_port_info *pi;
1614 int baud, bits, parity, flow;
1615
1616 pr_debug("mpsc_console_setup[%d]: options: %s\n", co->index, options);
1617
1618 if (co->index >= MPSC_NUM_CTLRS)
1619 co->index = 0;
1620
1621 pi = &mpsc_ports[co->index];
1622
1623 baud = pi->default_baud;
1624 bits = pi->default_bits;
1625 parity = pi->default_parity;
1626 flow = pi->default_flow;
1627
1628 if (!pi->port.ops)
1629 return -ENODEV;
1630
1631 spin_lock_init(&pi->port.lock); /* Temporary fix--copied from 8250.c */
1632
1633 if (options)
1634 uart_parse_options(options, &baud, &parity, &bits, &flow);
1635
1636 return uart_set_options(&pi->port, co, baud, parity, bits, flow);
1637 }
1638
1639 static struct console mpsc_console = {
1640 .name = MPSC_DEV_NAME,
1641 .write = mpsc_console_write,
1642 .device = uart_console_device,
1643 .setup = mpsc_console_setup,
1644 .flags = CON_PRINTBUFFER,
1645 .index = -1,
1646 .data = &mpsc_reg,
1647 };
1648
1649 static int __init mpsc_late_console_init(void)
1650 {
1651 pr_debug("mpsc_late_console_init: Enter\n");
1652
1653 if (!(mpsc_console.flags & CON_ENABLED))
1654 register_console(&mpsc_console);
1655 return 0;
1656 }
1657
1658 late_initcall(mpsc_late_console_init);
1659
1660 #define MPSC_CONSOLE &mpsc_console
1661 #else
1662 #define MPSC_CONSOLE NULL
1663 #endif
1664 /*
1665 ******************************************************************************
1666 *
1667 * Dummy Platform Driver to extract & map shared register regions
1668 *
1669 ******************************************************************************
1670 */
1671 static void mpsc_resource_err(char *s)
1672 {
1673 printk(KERN_WARNING "MPSC: Platform device resource error in %s\n", s);
1674 }
1675
1676 static int mpsc_shared_map_regs(struct platform_device *pd)
1677 {
1678 struct resource *r;
1679
1680 if ((r = platform_get_resource(pd, IORESOURCE_MEM,
1681 MPSC_ROUTING_BASE_ORDER))
1682 && request_mem_region(r->start,
1683 MPSC_ROUTING_REG_BLOCK_SIZE,
1684 "mpsc_routing_regs")) {
1685 mpsc_shared_regs.mpsc_routing_base = ioremap(r->start,
1686 MPSC_ROUTING_REG_BLOCK_SIZE);
1687 mpsc_shared_regs.mpsc_routing_base_p = r->start;
1688 } else {
1689 mpsc_resource_err("MPSC routing base");
1690 return -ENOMEM;
1691 }
1692
1693 if ((r = platform_get_resource(pd, IORESOURCE_MEM,
1694 MPSC_SDMA_INTR_BASE_ORDER))
1695 && request_mem_region(r->start,
1696 MPSC_SDMA_INTR_REG_BLOCK_SIZE,
1697 "sdma_intr_regs")) {
1698 mpsc_shared_regs.sdma_intr_base = ioremap(r->start,
1699 MPSC_SDMA_INTR_REG_BLOCK_SIZE);
1700 mpsc_shared_regs.sdma_intr_base_p = r->start;
1701 } else {
1702 iounmap(mpsc_shared_regs.mpsc_routing_base);
1703 release_mem_region(mpsc_shared_regs.mpsc_routing_base_p,
1704 MPSC_ROUTING_REG_BLOCK_SIZE);
1705 mpsc_resource_err("SDMA intr base");
1706 return -ENOMEM;
1707 }
1708
1709 return 0;
1710 }
1711
1712 static void mpsc_shared_unmap_regs(void)
1713 {
1714 if (!mpsc_shared_regs.mpsc_routing_base) {
1715 iounmap(mpsc_shared_regs.mpsc_routing_base);
1716 release_mem_region(mpsc_shared_regs.mpsc_routing_base_p,
1717 MPSC_ROUTING_REG_BLOCK_SIZE);
1718 }
1719 if (!mpsc_shared_regs.sdma_intr_base) {
1720 iounmap(mpsc_shared_regs.sdma_intr_base);
1721 release_mem_region(mpsc_shared_regs.sdma_intr_base_p,
1722 MPSC_SDMA_INTR_REG_BLOCK_SIZE);
1723 }
1724
1725 mpsc_shared_regs.mpsc_routing_base = NULL;
1726 mpsc_shared_regs.sdma_intr_base = NULL;
1727
1728 mpsc_shared_regs.mpsc_routing_base_p = 0;
1729 mpsc_shared_regs.sdma_intr_base_p = 0;
1730 }
1731
1732 static int mpsc_shared_drv_probe(struct platform_device *dev)
1733 {
1734 struct mpsc_shared_pdata *pdata;
1735 int rc = -ENODEV;
1736
1737 if (dev->id == 0) {
1738 if (!(rc = mpsc_shared_map_regs(dev))) {
1739 pdata = (struct mpsc_shared_pdata *)
1740 dev->dev.platform_data;
1741
1742 mpsc_shared_regs.MPSC_MRR_m = pdata->mrr_val;
1743 mpsc_shared_regs.MPSC_RCRR_m= pdata->rcrr_val;
1744 mpsc_shared_regs.MPSC_TCRR_m= pdata->tcrr_val;
1745 mpsc_shared_regs.SDMA_INTR_CAUSE_m =
1746 pdata->intr_cause_val;
1747 mpsc_shared_regs.SDMA_INTR_MASK_m =
1748 pdata->intr_mask_val;
1749
1750 rc = 0;
1751 }
1752 }
1753
1754 return rc;
1755 }
1756
1757 static int mpsc_shared_drv_remove(struct platform_device *dev)
1758 {
1759 int rc = -ENODEV;
1760
1761 if (dev->id == 0) {
1762 mpsc_shared_unmap_regs();
1763 mpsc_shared_regs.MPSC_MRR_m = 0;
1764 mpsc_shared_regs.MPSC_RCRR_m = 0;
1765 mpsc_shared_regs.MPSC_TCRR_m = 0;
1766 mpsc_shared_regs.SDMA_INTR_CAUSE_m = 0;
1767 mpsc_shared_regs.SDMA_INTR_MASK_m = 0;
1768 rc = 0;
1769 }
1770
1771 return rc;
1772 }
1773
1774 static struct platform_driver mpsc_shared_driver = {
1775 .probe = mpsc_shared_drv_probe,
1776 .remove = mpsc_shared_drv_remove,
1777 .driver = {
1778 .name = MPSC_SHARED_NAME,
1779 },
1780 };
1781
1782 /*
1783 ******************************************************************************
1784 *
1785 * Driver Interface Routines
1786 *
1787 ******************************************************************************
1788 */
1789 static struct uart_driver mpsc_reg = {
1790 .owner = THIS_MODULE,
1791 .driver_name = MPSC_DRIVER_NAME,
1792 .dev_name = MPSC_DEV_NAME,
1793 .major = MPSC_MAJOR,
1794 .minor = MPSC_MINOR_START,
1795 .nr = MPSC_NUM_CTLRS,
1796 .cons = MPSC_CONSOLE,
1797 };
1798
1799 static int mpsc_drv_map_regs(struct mpsc_port_info *pi,
1800 struct platform_device *pd)
1801 {
1802 struct resource *r;
1803
1804 if ((r = platform_get_resource(pd, IORESOURCE_MEM, MPSC_BASE_ORDER))
1805 && request_mem_region(r->start, MPSC_REG_BLOCK_SIZE,
1806 "mpsc_regs")) {
1807 pi->mpsc_base = ioremap(r->start, MPSC_REG_BLOCK_SIZE);
1808 pi->mpsc_base_p = r->start;
1809 } else {
1810 mpsc_resource_err("MPSC base");
1811 goto err;
1812 }
1813
1814 if ((r = platform_get_resource(pd, IORESOURCE_MEM,
1815 MPSC_SDMA_BASE_ORDER))
1816 && request_mem_region(r->start,
1817 MPSC_SDMA_REG_BLOCK_SIZE, "sdma_regs")) {
1818 pi->sdma_base = ioremap(r->start,MPSC_SDMA_REG_BLOCK_SIZE);
1819 pi->sdma_base_p = r->start;
1820 } else {
1821 mpsc_resource_err("SDMA base");
1822 if (pi->mpsc_base) {
1823 iounmap(pi->mpsc_base);
1824 pi->mpsc_base = NULL;
1825 }
1826 goto err;
1827 }
1828
1829 if ((r = platform_get_resource(pd,IORESOURCE_MEM,MPSC_BRG_BASE_ORDER))
1830 && request_mem_region(r->start,
1831 MPSC_BRG_REG_BLOCK_SIZE, "brg_regs")) {
1832 pi->brg_base = ioremap(r->start, MPSC_BRG_REG_BLOCK_SIZE);
1833 pi->brg_base_p = r->start;
1834 } else {
1835 mpsc_resource_err("BRG base");
1836 if (pi->mpsc_base) {
1837 iounmap(pi->mpsc_base);
1838 pi->mpsc_base = NULL;
1839 }
1840 if (pi->sdma_base) {
1841 iounmap(pi->sdma_base);
1842 pi->sdma_base = NULL;
1843 }
1844 goto err;
1845 }
1846 return 0;
1847
1848 err:
1849 return -ENOMEM;
1850 }
1851
1852 static void mpsc_drv_unmap_regs(struct mpsc_port_info *pi)
1853 {
1854 if (!pi->mpsc_base) {
1855 iounmap(pi->mpsc_base);
1856 release_mem_region(pi->mpsc_base_p, MPSC_REG_BLOCK_SIZE);
1857 }
1858 if (!pi->sdma_base) {
1859 iounmap(pi->sdma_base);
1860 release_mem_region(pi->sdma_base_p, MPSC_SDMA_REG_BLOCK_SIZE);
1861 }
1862 if (!pi->brg_base) {
1863 iounmap(pi->brg_base);
1864 release_mem_region(pi->brg_base_p, MPSC_BRG_REG_BLOCK_SIZE);
1865 }
1866
1867 pi->mpsc_base = NULL;
1868 pi->sdma_base = NULL;
1869 pi->brg_base = NULL;
1870
1871 pi->mpsc_base_p = 0;
1872 pi->sdma_base_p = 0;
1873 pi->brg_base_p = 0;
1874 }
1875
1876 static void mpsc_drv_get_platform_data(struct mpsc_port_info *pi,
1877 struct platform_device *pd, int num)
1878 {
1879 struct mpsc_pdata *pdata;
1880
1881 pdata = (struct mpsc_pdata *)pd->dev.platform_data;
1882
1883 pi->port.uartclk = pdata->brg_clk_freq;
1884 pi->port.iotype = UPIO_MEM;
1885 pi->port.line = num;
1886 pi->port.type = PORT_MPSC;
1887 pi->port.fifosize = MPSC_TXBE_SIZE;
1888 pi->port.membase = pi->mpsc_base;
1889 pi->port.mapbase = (ulong)pi->mpsc_base;
1890 pi->port.ops = &mpsc_pops;
1891
1892 pi->mirror_regs = pdata->mirror_regs;
1893 pi->cache_mgmt = pdata->cache_mgmt;
1894 pi->brg_can_tune = pdata->brg_can_tune;
1895 pi->brg_clk_src = pdata->brg_clk_src;
1896 pi->mpsc_max_idle = pdata->max_idle;
1897 pi->default_baud = pdata->default_baud;
1898 pi->default_bits = pdata->default_bits;
1899 pi->default_parity = pdata->default_parity;
1900 pi->default_flow = pdata->default_flow;
1901
1902 /* Initial values of mirrored regs */
1903 pi->MPSC_CHR_1_m = pdata->chr_1_val;
1904 pi->MPSC_CHR_2_m = pdata->chr_2_val;
1905 pi->MPSC_CHR_10_m = pdata->chr_10_val;
1906 pi->MPSC_MPCR_m = pdata->mpcr_val;
1907 pi->BRG_BCR_m = pdata->bcr_val;
1908
1909 pi->shared_regs = &mpsc_shared_regs;
1910
1911 pi->port.irq = platform_get_irq(pd, 0);
1912 }
1913
1914 static int mpsc_drv_probe(struct platform_device *dev)
1915 {
1916 struct mpsc_port_info *pi;
1917 int rc = -ENODEV;
1918
1919 pr_debug("mpsc_drv_probe: Adding MPSC %d\n", dev->id);
1920
1921 if (dev->id < MPSC_NUM_CTLRS) {
1922 pi = &mpsc_ports[dev->id];
1923
1924 if (!(rc = mpsc_drv_map_regs(pi, dev))) {
1925 mpsc_drv_get_platform_data(pi, dev, dev->id);
1926
1927 if (!(rc = mpsc_make_ready(pi))) {
1928 spin_lock_init(&pi->tx_lock);
1929 if (!(rc = uart_add_one_port(&mpsc_reg,
1930 &pi->port))) {
1931 rc = 0;
1932 } else {
1933 mpsc_release_port((struct uart_port *)
1934 pi);
1935 mpsc_drv_unmap_regs(pi);
1936 }
1937 } else {
1938 mpsc_drv_unmap_regs(pi);
1939 }
1940 }
1941 }
1942
1943 return rc;
1944 }
1945
1946 static int mpsc_drv_remove(struct platform_device *dev)
1947 {
1948 pr_debug("mpsc_drv_exit: Removing MPSC %d\n", dev->id);
1949
1950 if (dev->id < MPSC_NUM_CTLRS) {
1951 uart_remove_one_port(&mpsc_reg, &mpsc_ports[dev->id].port);
1952 mpsc_release_port((struct uart_port *)
1953 &mpsc_ports[dev->id].port);
1954 mpsc_drv_unmap_regs(&mpsc_ports[dev->id]);
1955 return 0;
1956 } else {
1957 return -ENODEV;
1958 }
1959 }
1960
1961 static struct platform_driver mpsc_driver = {
1962 .probe = mpsc_drv_probe,
1963 .remove = mpsc_drv_remove,
1964 .driver = {
1965 .name = MPSC_CTLR_NAME,
1966 },
1967 };
1968
1969 static int __init mpsc_drv_init(void)
1970 {
1971 int rc;
1972
1973 printk(KERN_INFO "Serial: MPSC driver $Revision: 1.00 $\n");
1974
1975 memset(mpsc_ports, 0, sizeof(mpsc_ports));
1976 memset(&mpsc_shared_regs, 0, sizeof(mpsc_shared_regs));
1977
1978 if (!(rc = uart_register_driver(&mpsc_reg))) {
1979 if (!(rc = platform_driver_register(&mpsc_shared_driver))) {
1980 if ((rc = platform_driver_register(&mpsc_driver))) {
1981 platform_driver_unregister(&mpsc_shared_driver);
1982 uart_unregister_driver(&mpsc_reg);
1983 }
1984 } else {
1985 uart_unregister_driver(&mpsc_reg);
1986 }
1987 }
1988
1989 return rc;
1990 }
1991
1992 static void __exit mpsc_drv_exit(void)
1993 {
1994 platform_driver_unregister(&mpsc_driver);
1995 platform_driver_unregister(&mpsc_shared_driver);
1996 uart_unregister_driver(&mpsc_reg);
1997 memset(mpsc_ports, 0, sizeof(mpsc_ports));
1998 memset(&mpsc_shared_regs, 0, sizeof(mpsc_shared_regs));
1999 }
2000
2001 module_init(mpsc_drv_init);
2002 module_exit(mpsc_drv_exit);
2003
2004 MODULE_AUTHOR("Mark A. Greer <mgreer@mvista.com>");
2005 MODULE_DESCRIPTION("Generic Marvell MPSC serial/UART driver $Revision: 1.00 $");
2006 MODULE_VERSION(MPSC_VERSION);
2007 MODULE_LICENSE("GPL");
2008 MODULE_ALIAS_CHARDEV_MAJOR(MPSC_MAJOR);
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