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/tty.h>
59 #include <linux/tty_flip.h>
60 #include <linux/ioport.h>
61 #include <linux/init.h>
62 #include <linux/console.h>
63 #include <linux/sysrq.h>
64 #include <linux/serial.h>
65 #include <linux/serial_core.h>
66 #include <linux/delay.h>
67 #include <linux/device.h>
68 #include <linux/dma-mapping.h>
69 #include <linux/mv643xx.h>
70 #include <linux/platform_device.h>
71 #include <linux/gfp.h>
72
73 #include <asm/io.h>
74 #include <asm/irq.h>
75
76 #define MPSC_NUM_CTLRS 2
77
78 /*
79 * Descriptors and buffers must be cache line aligned.
80 * Buffers lengths must be multiple of cache line size.
81 * Number of Tx & Rx descriptors must be powers of 2.
82 */
83 #define MPSC_RXR_ENTRIES 32
84 #define MPSC_RXRE_SIZE dma_get_cache_alignment()
85 #define MPSC_RXR_SIZE (MPSC_RXR_ENTRIES * MPSC_RXRE_SIZE)
86 #define MPSC_RXBE_SIZE dma_get_cache_alignment()
87 #define MPSC_RXB_SIZE (MPSC_RXR_ENTRIES * MPSC_RXBE_SIZE)
88
89 #define MPSC_TXR_ENTRIES 32
90 #define MPSC_TXRE_SIZE dma_get_cache_alignment()
91 #define MPSC_TXR_SIZE (MPSC_TXR_ENTRIES * MPSC_TXRE_SIZE)
92 #define MPSC_TXBE_SIZE dma_get_cache_alignment()
93 #define MPSC_TXB_SIZE (MPSC_TXR_ENTRIES * MPSC_TXBE_SIZE)
94
95 #define MPSC_DMA_ALLOC_SIZE (MPSC_RXR_SIZE + MPSC_RXB_SIZE + MPSC_TXR_SIZE \
96 + MPSC_TXB_SIZE + dma_get_cache_alignment() /* for alignment */)
97
98 /* Rx and Tx Ring entry descriptors -- assume entry size is <= cacheline size */
99 struct mpsc_rx_desc {
100 u16 bufsize;
101 u16 bytecnt;
102 u32 cmdstat;
103 u32 link;
104 u32 buf_ptr;
105 } __attribute((packed));
106
107 struct mpsc_tx_desc {
108 u16 bytecnt;
109 u16 shadow;
110 u32 cmdstat;
111 u32 link;
112 u32 buf_ptr;
113 } __attribute((packed));
114
115 /*
116 * Some regs that have the erratum that you can't read them are are shared
117 * between the two MPSC controllers. This struct contains those shared regs.
118 */
119 struct mpsc_shared_regs {
120 phys_addr_t mpsc_routing_base_p;
121 phys_addr_t sdma_intr_base_p;
122
123 void __iomem *mpsc_routing_base;
124 void __iomem *sdma_intr_base;
125
126 u32 MPSC_MRR_m;
127 u32 MPSC_RCRR_m;
128 u32 MPSC_TCRR_m;
129 u32 SDMA_INTR_CAUSE_m;
130 u32 SDMA_INTR_MASK_m;
131 };
132
133 /* The main driver data structure */
134 struct mpsc_port_info {
135 struct uart_port port; /* Overlay uart_port structure */
136
137 /* Internal driver state for this ctlr */
138 u8 ready;
139 u8 rcv_data;
140
141 /* Info passed in from platform */
142 u8 mirror_regs; /* Need to mirror regs? */
143 u8 cache_mgmt; /* Need manual cache mgmt? */
144 u8 brg_can_tune; /* BRG has baud tuning? */
145 u32 brg_clk_src;
146 u16 mpsc_max_idle;
147 int default_baud;
148 int default_bits;
149 int default_parity;
150 int default_flow;
151
152 /* Physical addresses of various blocks of registers (from platform) */
153 phys_addr_t mpsc_base_p;
154 phys_addr_t sdma_base_p;
155 phys_addr_t brg_base_p;
156
157 /* Virtual addresses of various blocks of registers (from platform) */
158 void __iomem *mpsc_base;
159 void __iomem *sdma_base;
160 void __iomem *brg_base;
161
162 /* Descriptor ring and buffer allocations */
163 void *dma_region;
164 dma_addr_t dma_region_p;
165
166 dma_addr_t rxr; /* Rx descriptor ring */
167 dma_addr_t rxr_p; /* Phys addr of rxr */
168 u8 *rxb; /* Rx Ring I/O buf */
169 u8 *rxb_p; /* Phys addr of rxb */
170 u32 rxr_posn; /* First desc w/ Rx data */
171
172 dma_addr_t txr; /* Tx descriptor ring */
173 dma_addr_t txr_p; /* Phys addr of txr */
174 u8 *txb; /* Tx Ring I/O buf */
175 u8 *txb_p; /* Phys addr of txb */
176 int txr_head; /* Where new data goes */
177 int txr_tail; /* Where sent data comes off */
178 spinlock_t tx_lock; /* transmit lock */
179
180 /* Mirrored values of regs we can't read (if 'mirror_regs' set) */
181 u32 MPSC_MPCR_m;
182 u32 MPSC_CHR_1_m;
183 u32 MPSC_CHR_2_m;
184 u32 MPSC_CHR_10_m;
185 u32 BRG_BCR_m;
186 struct mpsc_shared_regs *shared_regs;
187 };
188
189 /* Hooks to platform-specific code */
190 int mpsc_platform_register_driver(void);
191 void mpsc_platform_unregister_driver(void);
192
193 /* Hooks back in to mpsc common to be called by platform-specific code */
194 struct mpsc_port_info *mpsc_device_probe(int index);
195 struct mpsc_port_info *mpsc_device_remove(int index);
196
197 /* Main MPSC Configuration Register Offsets */
198 #define MPSC_MMCRL 0x0000
199 #define MPSC_MMCRH 0x0004
200 #define MPSC_MPCR 0x0008
201 #define MPSC_CHR_1 0x000c
202 #define MPSC_CHR_2 0x0010
203 #define MPSC_CHR_3 0x0014
204 #define MPSC_CHR_4 0x0018
205 #define MPSC_CHR_5 0x001c
206 #define MPSC_CHR_6 0x0020
207 #define MPSC_CHR_7 0x0024
208 #define MPSC_CHR_8 0x0028
209 #define MPSC_CHR_9 0x002c
210 #define MPSC_CHR_10 0x0030
211 #define MPSC_CHR_11 0x0034
212
213 #define MPSC_MPCR_FRZ (1 << 9)
214 #define MPSC_MPCR_CL_5 0
215 #define MPSC_MPCR_CL_6 1
216 #define MPSC_MPCR_CL_7 2
217 #define MPSC_MPCR_CL_8 3
218 #define MPSC_MPCR_SBL_1 0
219 #define MPSC_MPCR_SBL_2 1
220
221 #define MPSC_CHR_2_TEV (1<<1)
222 #define MPSC_CHR_2_TA (1<<7)
223 #define MPSC_CHR_2_TTCS (1<<9)
224 #define MPSC_CHR_2_REV (1<<17)
225 #define MPSC_CHR_2_RA (1<<23)
226 #define MPSC_CHR_2_CRD (1<<25)
227 #define MPSC_CHR_2_EH (1<<31)
228 #define MPSC_CHR_2_PAR_ODD 0
229 #define MPSC_CHR_2_PAR_SPACE 1
230 #define MPSC_CHR_2_PAR_EVEN 2
231 #define MPSC_CHR_2_PAR_MARK 3
232
233 /* MPSC Signal Routing */
234 #define MPSC_MRR 0x0000
235 #define MPSC_RCRR 0x0004
236 #define MPSC_TCRR 0x0008
237
238 /* Serial DMA Controller Interface Registers */
239 #define SDMA_SDC 0x0000
240 #define SDMA_SDCM 0x0008
241 #define SDMA_RX_DESC 0x0800
242 #define SDMA_RX_BUF_PTR 0x0808
243 #define SDMA_SCRDP 0x0810
244 #define SDMA_TX_DESC 0x0c00
245 #define SDMA_SCTDP 0x0c10
246 #define SDMA_SFTDP 0x0c14
247
248 #define SDMA_DESC_CMDSTAT_PE (1<<0)
249 #define SDMA_DESC_CMDSTAT_CDL (1<<1)
250 #define SDMA_DESC_CMDSTAT_FR (1<<3)
251 #define SDMA_DESC_CMDSTAT_OR (1<<6)
252 #define SDMA_DESC_CMDSTAT_BR (1<<9)
253 #define SDMA_DESC_CMDSTAT_MI (1<<10)
254 #define SDMA_DESC_CMDSTAT_A (1<<11)
255 #define SDMA_DESC_CMDSTAT_AM (1<<12)
256 #define SDMA_DESC_CMDSTAT_CT (1<<13)
257 #define SDMA_DESC_CMDSTAT_C (1<<14)
258 #define SDMA_DESC_CMDSTAT_ES (1<<15)
259 #define SDMA_DESC_CMDSTAT_L (1<<16)
260 #define SDMA_DESC_CMDSTAT_F (1<<17)
261 #define SDMA_DESC_CMDSTAT_P (1<<18)
262 #define SDMA_DESC_CMDSTAT_EI (1<<23)
263 #define SDMA_DESC_CMDSTAT_O (1<<31)
264
265 #define SDMA_DESC_DFLT (SDMA_DESC_CMDSTAT_O \
266 | SDMA_DESC_CMDSTAT_EI)
267
268 #define SDMA_SDC_RFT (1<<0)
269 #define SDMA_SDC_SFM (1<<1)
270 #define SDMA_SDC_BLMR (1<<6)
271 #define SDMA_SDC_BLMT (1<<7)
272 #define SDMA_SDC_POVR (1<<8)
273 #define SDMA_SDC_RIFB (1<<9)
274
275 #define SDMA_SDCM_ERD (1<<7)
276 #define SDMA_SDCM_AR (1<<15)
277 #define SDMA_SDCM_STD (1<<16)
278 #define SDMA_SDCM_TXD (1<<23)
279 #define SDMA_SDCM_AT (1<<31)
280
281 #define SDMA_0_CAUSE_RXBUF (1<<0)
282 #define SDMA_0_CAUSE_RXERR (1<<1)
283 #define SDMA_0_CAUSE_TXBUF (1<<2)
284 #define SDMA_0_CAUSE_TXEND (1<<3)
285 #define SDMA_1_CAUSE_RXBUF (1<<8)
286 #define SDMA_1_CAUSE_RXERR (1<<9)
287 #define SDMA_1_CAUSE_TXBUF (1<<10)
288 #define SDMA_1_CAUSE_TXEND (1<<11)
289
290 #define SDMA_CAUSE_RX_MASK (SDMA_0_CAUSE_RXBUF | SDMA_0_CAUSE_RXERR \
291 | SDMA_1_CAUSE_RXBUF | SDMA_1_CAUSE_RXERR)
292 #define SDMA_CAUSE_TX_MASK (SDMA_0_CAUSE_TXBUF | SDMA_0_CAUSE_TXEND \
293 | SDMA_1_CAUSE_TXBUF | SDMA_1_CAUSE_TXEND)
294
295 /* SDMA Interrupt registers */
296 #define SDMA_INTR_CAUSE 0x0000
297 #define SDMA_INTR_MASK 0x0080
298
299 /* Baud Rate Generator Interface Registers */
300 #define BRG_BCR 0x0000
301 #define BRG_BTR 0x0004
302
303 /*
304 * Define how this driver is known to the outside (we've been assigned a
305 * range on the "Low-density serial ports" major).
306 */
307 #define MPSC_MAJOR 204
308 #define MPSC_MINOR_START 44
309 #define MPSC_DRIVER_NAME "MPSC"
310 #define MPSC_DEV_NAME "ttyMM"
311 #define MPSC_VERSION "1.00"
312
313 static struct mpsc_port_info mpsc_ports[MPSC_NUM_CTLRS];
314 static struct mpsc_shared_regs mpsc_shared_regs;
315 static struct uart_driver mpsc_reg;
316
317 static void mpsc_start_rx(struct mpsc_port_info *pi);
318 static void mpsc_free_ring_mem(struct mpsc_port_info *pi);
319 static void mpsc_release_port(struct uart_port *port);
320 /*
321 ******************************************************************************
322 *
323 * Baud Rate Generator Routines (BRG)
324 *
325 ******************************************************************************
326 */
mpsc_brg_init(struct mpsc_port_info * pi,u32 clk_src)327 static void mpsc_brg_init(struct mpsc_port_info *pi, u32 clk_src)
328 {
329 u32 v;
330
331 v = (pi->mirror_regs) ? pi->BRG_BCR_m : readl(pi->brg_base + BRG_BCR);
332 v = (v & ~(0xf << 18)) | ((clk_src & 0xf) << 18);
333
334 if (pi->brg_can_tune)
335 v &= ~(1 << 25);
336
337 if (pi->mirror_regs)
338 pi->BRG_BCR_m = v;
339 writel(v, pi->brg_base + BRG_BCR);
340
341 writel(readl(pi->brg_base + BRG_BTR) & 0xffff0000,
342 pi->brg_base + BRG_BTR);
343 }
344
mpsc_brg_enable(struct mpsc_port_info * pi)345 static void mpsc_brg_enable(struct mpsc_port_info *pi)
346 {
347 u32 v;
348
349 v = (pi->mirror_regs) ? pi->BRG_BCR_m : readl(pi->brg_base + BRG_BCR);
350 v |= (1 << 16);
351
352 if (pi->mirror_regs)
353 pi->BRG_BCR_m = v;
354 writel(v, pi->brg_base + BRG_BCR);
355 }
356
mpsc_brg_disable(struct mpsc_port_info * pi)357 static void mpsc_brg_disable(struct mpsc_port_info *pi)
358 {
359 u32 v;
360
361 v = (pi->mirror_regs) ? pi->BRG_BCR_m : readl(pi->brg_base + BRG_BCR);
362 v &= ~(1 << 16);
363
364 if (pi->mirror_regs)
365 pi->BRG_BCR_m = v;
366 writel(v, pi->brg_base + BRG_BCR);
367 }
368
369 /*
370 * To set the baud, we adjust the CDV field in the BRG_BCR reg.
371 * From manual: Baud = clk / ((CDV+1)*2) ==> CDV = (clk / (baud*2)) - 1.
372 * However, the input clock is divided by 16 in the MPSC b/c of how
373 * 'MPSC_MMCRH' was set up so we have to divide the 'clk' used in our
374 * calculation by 16 to account for that. So the real calculation
375 * that accounts for the way the mpsc is set up is:
376 * CDV = (clk / (baud*2*16)) - 1 ==> CDV = (clk / (baud << 5)) - 1.
377 */
mpsc_set_baudrate(struct mpsc_port_info * pi,u32 baud)378 static void mpsc_set_baudrate(struct mpsc_port_info *pi, u32 baud)
379 {
380 u32 cdv = (pi->port.uartclk / (baud << 5)) - 1;
381 u32 v;
382
383 mpsc_brg_disable(pi);
384 v = (pi->mirror_regs) ? pi->BRG_BCR_m : readl(pi->brg_base + BRG_BCR);
385 v = (v & 0xffff0000) | (cdv & 0xffff);
386
387 if (pi->mirror_regs)
388 pi->BRG_BCR_m = v;
389 writel(v, pi->brg_base + BRG_BCR);
390 mpsc_brg_enable(pi);
391 }
392
393 /*
394 ******************************************************************************
395 *
396 * Serial DMA Routines (SDMA)
397 *
398 ******************************************************************************
399 */
400
mpsc_sdma_burstsize(struct mpsc_port_info * pi,u32 burst_size)401 static void mpsc_sdma_burstsize(struct mpsc_port_info *pi, u32 burst_size)
402 {
403 u32 v;
404
405 pr_debug("mpsc_sdma_burstsize[%d]: burst_size: %d\n",
406 pi->port.line, burst_size);
407
408 burst_size >>= 3; /* Divide by 8 b/c reg values are 8-byte chunks */
409
410 if (burst_size < 2)
411 v = 0x0; /* 1 64-bit word */
412 else if (burst_size < 4)
413 v = 0x1; /* 2 64-bit words */
414 else if (burst_size < 8)
415 v = 0x2; /* 4 64-bit words */
416 else
417 v = 0x3; /* 8 64-bit words */
418
419 writel((readl(pi->sdma_base + SDMA_SDC) & (0x3 << 12)) | (v << 12),
420 pi->sdma_base + SDMA_SDC);
421 }
422
mpsc_sdma_init(struct mpsc_port_info * pi,u32 burst_size)423 static void mpsc_sdma_init(struct mpsc_port_info *pi, u32 burst_size)
424 {
425 pr_debug("mpsc_sdma_init[%d]: burst_size: %d\n", pi->port.line,
426 burst_size);
427
428 writel((readl(pi->sdma_base + SDMA_SDC) & 0x3ff) | 0x03f,
429 pi->sdma_base + SDMA_SDC);
430 mpsc_sdma_burstsize(pi, burst_size);
431 }
432
mpsc_sdma_intr_mask(struct mpsc_port_info * pi,u32 mask)433 static u32 mpsc_sdma_intr_mask(struct mpsc_port_info *pi, u32 mask)
434 {
435 u32 old, v;
436
437 pr_debug("mpsc_sdma_intr_mask[%d]: mask: 0x%x\n", pi->port.line, mask);
438
439 old = v = (pi->mirror_regs) ? pi->shared_regs->SDMA_INTR_MASK_m :
440 readl(pi->shared_regs->sdma_intr_base + SDMA_INTR_MASK);
441
442 mask &= 0xf;
443 if (pi->port.line)
444 mask <<= 8;
445 v &= ~mask;
446
447 if (pi->mirror_regs)
448 pi->shared_regs->SDMA_INTR_MASK_m = v;
449 writel(v, pi->shared_regs->sdma_intr_base + SDMA_INTR_MASK);
450
451 if (pi->port.line)
452 old >>= 8;
453 return old & 0xf;
454 }
455
mpsc_sdma_intr_unmask(struct mpsc_port_info * pi,u32 mask)456 static void mpsc_sdma_intr_unmask(struct mpsc_port_info *pi, u32 mask)
457 {
458 u32 v;
459
460 pr_debug("mpsc_sdma_intr_unmask[%d]: mask: 0x%x\n", pi->port.line,mask);
461
462 v = (pi->mirror_regs) ? pi->shared_regs->SDMA_INTR_MASK_m
463 : readl(pi->shared_regs->sdma_intr_base + SDMA_INTR_MASK);
464
465 mask &= 0xf;
466 if (pi->port.line)
467 mask <<= 8;
468 v |= mask;
469
470 if (pi->mirror_regs)
471 pi->shared_regs->SDMA_INTR_MASK_m = v;
472 writel(v, pi->shared_regs->sdma_intr_base + SDMA_INTR_MASK);
473 }
474
mpsc_sdma_intr_ack(struct mpsc_port_info * pi)475 static void mpsc_sdma_intr_ack(struct mpsc_port_info *pi)
476 {
477 pr_debug("mpsc_sdma_intr_ack[%d]: Acknowledging IRQ\n", pi->port.line);
478
479 if (pi->mirror_regs)
480 pi->shared_regs->SDMA_INTR_CAUSE_m = 0;
481 writeb(0x00, pi->shared_regs->sdma_intr_base + SDMA_INTR_CAUSE
482 + pi->port.line);
483 }
484
mpsc_sdma_set_rx_ring(struct mpsc_port_info * pi,struct mpsc_rx_desc * rxre_p)485 static void mpsc_sdma_set_rx_ring(struct mpsc_port_info *pi,
486 struct mpsc_rx_desc *rxre_p)
487 {
488 pr_debug("mpsc_sdma_set_rx_ring[%d]: rxre_p: 0x%x\n",
489 pi->port.line, (u32)rxre_p);
490
491 writel((u32)rxre_p, pi->sdma_base + SDMA_SCRDP);
492 }
493
mpsc_sdma_set_tx_ring(struct mpsc_port_info * pi,struct mpsc_tx_desc * txre_p)494 static void mpsc_sdma_set_tx_ring(struct mpsc_port_info *pi,
495 struct mpsc_tx_desc *txre_p)
496 {
497 writel((u32)txre_p, pi->sdma_base + SDMA_SFTDP);
498 writel((u32)txre_p, pi->sdma_base + SDMA_SCTDP);
499 }
500
mpsc_sdma_cmd(struct mpsc_port_info * pi,u32 val)501 static void mpsc_sdma_cmd(struct mpsc_port_info *pi, u32 val)
502 {
503 u32 v;
504
505 v = readl(pi->sdma_base + SDMA_SDCM);
506 if (val)
507 v |= val;
508 else
509 v = 0;
510 wmb();
511 writel(v, pi->sdma_base + SDMA_SDCM);
512 wmb();
513 }
514
mpsc_sdma_tx_active(struct mpsc_port_info * pi)515 static uint mpsc_sdma_tx_active(struct mpsc_port_info *pi)
516 {
517 return readl(pi->sdma_base + SDMA_SDCM) & SDMA_SDCM_TXD;
518 }
519
mpsc_sdma_start_tx(struct mpsc_port_info * pi)520 static void mpsc_sdma_start_tx(struct mpsc_port_info *pi)
521 {
522 struct mpsc_tx_desc *txre, *txre_p;
523
524 /* If tx isn't running & there's a desc ready to go, start it */
525 if (!mpsc_sdma_tx_active(pi)) {
526 txre = (struct mpsc_tx_desc *)(pi->txr
527 + (pi->txr_tail * MPSC_TXRE_SIZE));
528 dma_cache_sync(pi->port.dev, (void *)txre, MPSC_TXRE_SIZE,
529 DMA_FROM_DEVICE);
530 #if defined(CONFIG_PPC32) && !defined(CONFIG_NOT_COHERENT_CACHE)
531 if (pi->cache_mgmt) /* GT642[46]0 Res #COMM-2 */
532 invalidate_dcache_range((ulong)txre,
533 (ulong)txre + MPSC_TXRE_SIZE);
534 #endif
535
536 if (be32_to_cpu(txre->cmdstat) & SDMA_DESC_CMDSTAT_O) {
537 txre_p = (struct mpsc_tx_desc *)
538 (pi->txr_p + (pi->txr_tail * MPSC_TXRE_SIZE));
539
540 mpsc_sdma_set_tx_ring(pi, txre_p);
541 mpsc_sdma_cmd(pi, SDMA_SDCM_STD | SDMA_SDCM_TXD);
542 }
543 }
544 }
545
mpsc_sdma_stop(struct mpsc_port_info * pi)546 static void mpsc_sdma_stop(struct mpsc_port_info *pi)
547 {
548 pr_debug("mpsc_sdma_stop[%d]: Stopping SDMA\n", pi->port.line);
549
550 /* Abort any SDMA transfers */
551 mpsc_sdma_cmd(pi, 0);
552 mpsc_sdma_cmd(pi, SDMA_SDCM_AR | SDMA_SDCM_AT);
553
554 /* Clear the SDMA current and first TX and RX pointers */
555 mpsc_sdma_set_tx_ring(pi, NULL);
556 mpsc_sdma_set_rx_ring(pi, NULL);
557
558 /* Disable interrupts */
559 mpsc_sdma_intr_mask(pi, 0xf);
560 mpsc_sdma_intr_ack(pi);
561 }
562
563 /*
564 ******************************************************************************
565 *
566 * Multi-Protocol Serial Controller Routines (MPSC)
567 *
568 ******************************************************************************
569 */
570
mpsc_hw_init(struct mpsc_port_info * pi)571 static void mpsc_hw_init(struct mpsc_port_info *pi)
572 {
573 u32 v;
574
575 pr_debug("mpsc_hw_init[%d]: Initializing hardware\n", pi->port.line);
576
577 /* Set up clock routing */
578 if (pi->mirror_regs) {
579 v = pi->shared_regs->MPSC_MRR_m;
580 v &= ~0x1c7;
581 pi->shared_regs->MPSC_MRR_m = v;
582 writel(v, pi->shared_regs->mpsc_routing_base + MPSC_MRR);
583
584 v = pi->shared_regs->MPSC_RCRR_m;
585 v = (v & ~0xf0f) | 0x100;
586 pi->shared_regs->MPSC_RCRR_m = v;
587 writel(v, pi->shared_regs->mpsc_routing_base + MPSC_RCRR);
588
589 v = pi->shared_regs->MPSC_TCRR_m;
590 v = (v & ~0xf0f) | 0x100;
591 pi->shared_regs->MPSC_TCRR_m = v;
592 writel(v, pi->shared_regs->mpsc_routing_base + MPSC_TCRR);
593 } else {
594 v = readl(pi->shared_regs->mpsc_routing_base + MPSC_MRR);
595 v &= ~0x1c7;
596 writel(v, pi->shared_regs->mpsc_routing_base + MPSC_MRR);
597
598 v = readl(pi->shared_regs->mpsc_routing_base + MPSC_RCRR);
599 v = (v & ~0xf0f) | 0x100;
600 writel(v, pi->shared_regs->mpsc_routing_base + MPSC_RCRR);
601
602 v = readl(pi->shared_regs->mpsc_routing_base + MPSC_TCRR);
603 v = (v & ~0xf0f) | 0x100;
604 writel(v, pi->shared_regs->mpsc_routing_base + MPSC_TCRR);
605 }
606
607 /* Put MPSC in UART mode & enabel Tx/Rx egines */
608 writel(0x000004c4, pi->mpsc_base + MPSC_MMCRL);
609
610 /* No preamble, 16x divider, low-latency, */
611 writel(0x04400400, pi->mpsc_base + MPSC_MMCRH);
612 mpsc_set_baudrate(pi, pi->default_baud);
613
614 if (pi->mirror_regs) {
615 pi->MPSC_CHR_1_m = 0;
616 pi->MPSC_CHR_2_m = 0;
617 }
618 writel(0, pi->mpsc_base + MPSC_CHR_1);
619 writel(0, pi->mpsc_base + MPSC_CHR_2);
620 writel(pi->mpsc_max_idle, pi->mpsc_base + MPSC_CHR_3);
621 writel(0, pi->mpsc_base + MPSC_CHR_4);
622 writel(0, pi->mpsc_base + MPSC_CHR_5);
623 writel(0, pi->mpsc_base + MPSC_CHR_6);
624 writel(0, pi->mpsc_base + MPSC_CHR_7);
625 writel(0, pi->mpsc_base + MPSC_CHR_8);
626 writel(0, pi->mpsc_base + MPSC_CHR_9);
627 writel(0, pi->mpsc_base + MPSC_CHR_10);
628 }
629
mpsc_enter_hunt(struct mpsc_port_info * pi)630 static void mpsc_enter_hunt(struct mpsc_port_info *pi)
631 {
632 pr_debug("mpsc_enter_hunt[%d]: Hunting...\n", pi->port.line);
633
634 if (pi->mirror_regs) {
635 writel(pi->MPSC_CHR_2_m | MPSC_CHR_2_EH,
636 pi->mpsc_base + MPSC_CHR_2);
637 /* Erratum prevents reading CHR_2 so just delay for a while */
638 udelay(100);
639 } else {
640 writel(readl(pi->mpsc_base + MPSC_CHR_2) | MPSC_CHR_2_EH,
641 pi->mpsc_base + MPSC_CHR_2);
642
643 while (readl(pi->mpsc_base + MPSC_CHR_2) & MPSC_CHR_2_EH)
644 udelay(10);
645 }
646 }
647
mpsc_freeze(struct mpsc_port_info * pi)648 static void mpsc_freeze(struct mpsc_port_info *pi)
649 {
650 u32 v;
651
652 pr_debug("mpsc_freeze[%d]: Freezing\n", pi->port.line);
653
654 v = (pi->mirror_regs) ? pi->MPSC_MPCR_m :
655 readl(pi->mpsc_base + MPSC_MPCR);
656 v |= MPSC_MPCR_FRZ;
657
658 if (pi->mirror_regs)
659 pi->MPSC_MPCR_m = v;
660 writel(v, pi->mpsc_base + MPSC_MPCR);
661 }
662
mpsc_unfreeze(struct mpsc_port_info * pi)663 static void mpsc_unfreeze(struct mpsc_port_info *pi)
664 {
665 u32 v;
666
667 v = (pi->mirror_regs) ? pi->MPSC_MPCR_m :
668 readl(pi->mpsc_base + MPSC_MPCR);
669 v &= ~MPSC_MPCR_FRZ;
670
671 if (pi->mirror_regs)
672 pi->MPSC_MPCR_m = v;
673 writel(v, pi->mpsc_base + MPSC_MPCR);
674
675 pr_debug("mpsc_unfreeze[%d]: Unfrozen\n", pi->port.line);
676 }
677
mpsc_set_char_length(struct mpsc_port_info * pi,u32 len)678 static void mpsc_set_char_length(struct mpsc_port_info *pi, u32 len)
679 {
680 u32 v;
681
682 pr_debug("mpsc_set_char_length[%d]: char len: %d\n", pi->port.line,len);
683
684 v = (pi->mirror_regs) ? pi->MPSC_MPCR_m :
685 readl(pi->mpsc_base + MPSC_MPCR);
686 v = (v & ~(0x3 << 12)) | ((len & 0x3) << 12);
687
688 if (pi->mirror_regs)
689 pi->MPSC_MPCR_m = v;
690 writel(v, pi->mpsc_base + MPSC_MPCR);
691 }
692
mpsc_set_stop_bit_length(struct mpsc_port_info * pi,u32 len)693 static void mpsc_set_stop_bit_length(struct mpsc_port_info *pi, u32 len)
694 {
695 u32 v;
696
697 pr_debug("mpsc_set_stop_bit_length[%d]: stop bits: %d\n",
698 pi->port.line, len);
699
700 v = (pi->mirror_regs) ? pi->MPSC_MPCR_m :
701 readl(pi->mpsc_base + MPSC_MPCR);
702
703 v = (v & ~(1 << 14)) | ((len & 0x1) << 14);
704
705 if (pi->mirror_regs)
706 pi->MPSC_MPCR_m = v;
707 writel(v, pi->mpsc_base + MPSC_MPCR);
708 }
709
mpsc_set_parity(struct mpsc_port_info * pi,u32 p)710 static void mpsc_set_parity(struct mpsc_port_info *pi, u32 p)
711 {
712 u32 v;
713
714 pr_debug("mpsc_set_parity[%d]: parity bits: 0x%x\n", pi->port.line, p);
715
716 v = (pi->mirror_regs) ? pi->MPSC_CHR_2_m :
717 readl(pi->mpsc_base + MPSC_CHR_2);
718
719 p &= 0x3;
720 v = (v & ~0xc000c) | (p << 18) | (p << 2);
721
722 if (pi->mirror_regs)
723 pi->MPSC_CHR_2_m = v;
724 writel(v, pi->mpsc_base + MPSC_CHR_2);
725 }
726
727 /*
728 ******************************************************************************
729 *
730 * Driver Init Routines
731 *
732 ******************************************************************************
733 */
734
mpsc_init_hw(struct mpsc_port_info * pi)735 static void mpsc_init_hw(struct mpsc_port_info *pi)
736 {
737 pr_debug("mpsc_init_hw[%d]: Initializing\n", pi->port.line);
738
739 mpsc_brg_init(pi, pi->brg_clk_src);
740 mpsc_brg_enable(pi);
741 mpsc_sdma_init(pi, dma_get_cache_alignment()); /* burst a cacheline */
742 mpsc_sdma_stop(pi);
743 mpsc_hw_init(pi);
744 }
745
mpsc_alloc_ring_mem(struct mpsc_port_info * pi)746 static int mpsc_alloc_ring_mem(struct mpsc_port_info *pi)
747 {
748 int rc = 0;
749
750 pr_debug("mpsc_alloc_ring_mem[%d]: Allocating ring mem\n",
751 pi->port.line);
752
753 if (!pi->dma_region) {
754 if (!dma_set_mask(pi->port.dev, 0xffffffff)) {
755 printk(KERN_ERR "MPSC: Inadequate DMA support\n");
756 rc = -ENXIO;
757 } else if ((pi->dma_region = dma_alloc_noncoherent(pi->port.dev,
758 MPSC_DMA_ALLOC_SIZE,
759 &pi->dma_region_p, GFP_KERNEL))
760 == NULL) {
761 printk(KERN_ERR "MPSC: Can't alloc Desc region\n");
762 rc = -ENOMEM;
763 }
764 }
765
766 return rc;
767 }
768
mpsc_free_ring_mem(struct mpsc_port_info * pi)769 static void mpsc_free_ring_mem(struct mpsc_port_info *pi)
770 {
771 pr_debug("mpsc_free_ring_mem[%d]: Freeing ring mem\n", pi->port.line);
772
773 if (pi->dma_region) {
774 dma_free_noncoherent(pi->port.dev, MPSC_DMA_ALLOC_SIZE,
775 pi->dma_region, pi->dma_region_p);
776 pi->dma_region = NULL;
777 pi->dma_region_p = (dma_addr_t)NULL;
778 }
779 }
780
mpsc_init_rings(struct mpsc_port_info * pi)781 static void mpsc_init_rings(struct mpsc_port_info *pi)
782 {
783 struct mpsc_rx_desc *rxre;
784 struct mpsc_tx_desc *txre;
785 dma_addr_t dp, dp_p;
786 u8 *bp, *bp_p;
787 int i;
788
789 pr_debug("mpsc_init_rings[%d]: Initializing rings\n", pi->port.line);
790
791 BUG_ON(pi->dma_region == NULL);
792
793 memset(pi->dma_region, 0, MPSC_DMA_ALLOC_SIZE);
794
795 /*
796 * Descriptors & buffers are multiples of cacheline size and must be
797 * cacheline aligned.
798 */
799 dp = ALIGN((u32)pi->dma_region, dma_get_cache_alignment());
800 dp_p = ALIGN((u32)pi->dma_region_p, dma_get_cache_alignment());
801
802 /*
803 * Partition dma region into rx ring descriptor, rx buffers,
804 * tx ring descriptors, and tx buffers.
805 */
806 pi->rxr = dp;
807 pi->rxr_p = dp_p;
808 dp += MPSC_RXR_SIZE;
809 dp_p += MPSC_RXR_SIZE;
810
811 pi->rxb = (u8 *)dp;
812 pi->rxb_p = (u8 *)dp_p;
813 dp += MPSC_RXB_SIZE;
814 dp_p += MPSC_RXB_SIZE;
815
816 pi->rxr_posn = 0;
817
818 pi->txr = dp;
819 pi->txr_p = dp_p;
820 dp += MPSC_TXR_SIZE;
821 dp_p += MPSC_TXR_SIZE;
822
823 pi->txb = (u8 *)dp;
824 pi->txb_p = (u8 *)dp_p;
825
826 pi->txr_head = 0;
827 pi->txr_tail = 0;
828
829 /* Init rx ring descriptors */
830 dp = pi->rxr;
831 dp_p = pi->rxr_p;
832 bp = pi->rxb;
833 bp_p = pi->rxb_p;
834
835 for (i = 0; i < MPSC_RXR_ENTRIES; i++) {
836 rxre = (struct mpsc_rx_desc *)dp;
837
838 rxre->bufsize = cpu_to_be16(MPSC_RXBE_SIZE);
839 rxre->bytecnt = cpu_to_be16(0);
840 rxre->cmdstat = cpu_to_be32(SDMA_DESC_CMDSTAT_O
841 | SDMA_DESC_CMDSTAT_EI | SDMA_DESC_CMDSTAT_F
842 | SDMA_DESC_CMDSTAT_L);
843 rxre->link = cpu_to_be32(dp_p + MPSC_RXRE_SIZE);
844 rxre->buf_ptr = cpu_to_be32(bp_p);
845
846 dp += MPSC_RXRE_SIZE;
847 dp_p += MPSC_RXRE_SIZE;
848 bp += MPSC_RXBE_SIZE;
849 bp_p += MPSC_RXBE_SIZE;
850 }
851 rxre->link = cpu_to_be32(pi->rxr_p); /* Wrap last back to first */
852
853 /* Init tx ring descriptors */
854 dp = pi->txr;
855 dp_p = pi->txr_p;
856 bp = pi->txb;
857 bp_p = pi->txb_p;
858
859 for (i = 0; i < MPSC_TXR_ENTRIES; i++) {
860 txre = (struct mpsc_tx_desc *)dp;
861
862 txre->link = cpu_to_be32(dp_p + MPSC_TXRE_SIZE);
863 txre->buf_ptr = cpu_to_be32(bp_p);
864
865 dp += MPSC_TXRE_SIZE;
866 dp_p += MPSC_TXRE_SIZE;
867 bp += MPSC_TXBE_SIZE;
868 bp_p += MPSC_TXBE_SIZE;
869 }
870 txre->link = cpu_to_be32(pi->txr_p); /* Wrap last back to first */
871
872 dma_cache_sync(pi->port.dev, (void *)pi->dma_region,
873 MPSC_DMA_ALLOC_SIZE, DMA_BIDIRECTIONAL);
874 #if defined(CONFIG_PPC32) && !defined(CONFIG_NOT_COHERENT_CACHE)
875 if (pi->cache_mgmt) /* GT642[46]0 Res #COMM-2 */
876 flush_dcache_range((ulong)pi->dma_region,
877 (ulong)pi->dma_region
878 + MPSC_DMA_ALLOC_SIZE);
879 #endif
880
881 return;
882 }
883
mpsc_uninit_rings(struct mpsc_port_info * pi)884 static void mpsc_uninit_rings(struct mpsc_port_info *pi)
885 {
886 pr_debug("mpsc_uninit_rings[%d]: Uninitializing rings\n",pi->port.line);
887
888 BUG_ON(pi->dma_region == NULL);
889
890 pi->rxr = 0;
891 pi->rxr_p = 0;
892 pi->rxb = NULL;
893 pi->rxb_p = NULL;
894 pi->rxr_posn = 0;
895
896 pi->txr = 0;
897 pi->txr_p = 0;
898 pi->txb = NULL;
899 pi->txb_p = NULL;
900 pi->txr_head = 0;
901 pi->txr_tail = 0;
902 }
903
mpsc_make_ready(struct mpsc_port_info * pi)904 static int mpsc_make_ready(struct mpsc_port_info *pi)
905 {
906 int rc;
907
908 pr_debug("mpsc_make_ready[%d]: Making cltr ready\n", pi->port.line);
909
910 if (!pi->ready) {
911 mpsc_init_hw(pi);
912 rc = mpsc_alloc_ring_mem(pi);
913 if (rc)
914 return rc;
915 mpsc_init_rings(pi);
916 pi->ready = 1;
917 }
918
919 return 0;
920 }
921
922 #ifdef CONFIG_CONSOLE_POLL
923 static int serial_polled;
924 #endif
925
926 /*
927 ******************************************************************************
928 *
929 * Interrupt Handling Routines
930 *
931 ******************************************************************************
932 */
933
mpsc_rx_intr(struct mpsc_port_info * pi,unsigned long * flags)934 static int mpsc_rx_intr(struct mpsc_port_info *pi, unsigned long *flags)
935 {
936 struct mpsc_rx_desc *rxre;
937 struct tty_port *port = &pi->port.state->port;
938 u32 cmdstat, bytes_in, i;
939 int rc = 0;
940 u8 *bp;
941 char flag = TTY_NORMAL;
942
943 pr_debug("mpsc_rx_intr[%d]: Handling Rx intr\n", pi->port.line);
944
945 rxre = (struct mpsc_rx_desc *)(pi->rxr + (pi->rxr_posn*MPSC_RXRE_SIZE));
946
947 dma_cache_sync(pi->port.dev, (void *)rxre, MPSC_RXRE_SIZE,
948 DMA_FROM_DEVICE);
949 #if defined(CONFIG_PPC32) && !defined(CONFIG_NOT_COHERENT_CACHE)
950 if (pi->cache_mgmt) /* GT642[46]0 Res #COMM-2 */
951 invalidate_dcache_range((ulong)rxre,
952 (ulong)rxre + MPSC_RXRE_SIZE);
953 #endif
954
955 /*
956 * Loop through Rx descriptors handling ones that have been completed.
957 */
958 while (!((cmdstat = be32_to_cpu(rxre->cmdstat))
959 & SDMA_DESC_CMDSTAT_O)) {
960 bytes_in = be16_to_cpu(rxre->bytecnt);
961 #ifdef CONFIG_CONSOLE_POLL
962 if (unlikely(serial_polled)) {
963 serial_polled = 0;
964 return 0;
965 }
966 #endif
967 /* Following use of tty struct directly is deprecated */
968 if (tty_buffer_request_room(port, bytes_in) < bytes_in) {
969 if (port->low_latency) {
970 spin_unlock_irqrestore(&pi->port.lock, *flags);
971 tty_flip_buffer_push(port);
972 spin_lock_irqsave(&pi->port.lock, *flags);
973 }
974 /*
975 * If this failed then we will throw away the bytes
976 * but must do so to clear interrupts.
977 */
978 }
979
980 bp = pi->rxb + (pi->rxr_posn * MPSC_RXBE_SIZE);
981 dma_cache_sync(pi->port.dev, (void *)bp, MPSC_RXBE_SIZE,
982 DMA_FROM_DEVICE);
983 #if defined(CONFIG_PPC32) && !defined(CONFIG_NOT_COHERENT_CACHE)
984 if (pi->cache_mgmt) /* GT642[46]0 Res #COMM-2 */
985 invalidate_dcache_range((ulong)bp,
986 (ulong)bp + MPSC_RXBE_SIZE);
987 #endif
988
989 /*
990 * Other than for parity error, the manual provides little
991 * info on what data will be in a frame flagged by any of
992 * these errors. For parity error, it is the last byte in
993 * the buffer that had the error. As for the rest, I guess
994 * we'll assume there is no data in the buffer.
995 * If there is...it gets lost.
996 */
997 if (unlikely(cmdstat & (SDMA_DESC_CMDSTAT_BR
998 | SDMA_DESC_CMDSTAT_FR
999 | SDMA_DESC_CMDSTAT_OR))) {
1000
1001 pi->port.icount.rx++;
1002
1003 if (cmdstat & SDMA_DESC_CMDSTAT_BR) { /* Break */
1004 pi->port.icount.brk++;
1005
1006 if (uart_handle_break(&pi->port))
1007 goto next_frame;
1008 } else if (cmdstat & SDMA_DESC_CMDSTAT_FR) {
1009 pi->port.icount.frame++;
1010 } else if (cmdstat & SDMA_DESC_CMDSTAT_OR) {
1011 pi->port.icount.overrun++;
1012 }
1013
1014 cmdstat &= pi->port.read_status_mask;
1015
1016 if (cmdstat & SDMA_DESC_CMDSTAT_BR)
1017 flag = TTY_BREAK;
1018 else if (cmdstat & SDMA_DESC_CMDSTAT_FR)
1019 flag = TTY_FRAME;
1020 else if (cmdstat & SDMA_DESC_CMDSTAT_OR)
1021 flag = TTY_OVERRUN;
1022 else if (cmdstat & SDMA_DESC_CMDSTAT_PE)
1023 flag = TTY_PARITY;
1024 }
1025
1026 if (uart_handle_sysrq_char(&pi->port, *bp)) {
1027 bp++;
1028 bytes_in--;
1029 #ifdef CONFIG_CONSOLE_POLL
1030 if (unlikely(serial_polled)) {
1031 serial_polled = 0;
1032 return 0;
1033 }
1034 #endif
1035 goto next_frame;
1036 }
1037
1038 if ((unlikely(cmdstat & (SDMA_DESC_CMDSTAT_BR
1039 | SDMA_DESC_CMDSTAT_FR
1040 | SDMA_DESC_CMDSTAT_OR)))
1041 && !(cmdstat & pi->port.ignore_status_mask)) {
1042 tty_insert_flip_char(port, *bp, flag);
1043 } else {
1044 for (i=0; i<bytes_in; i++)
1045 tty_insert_flip_char(port, *bp++, TTY_NORMAL);
1046
1047 pi->port.icount.rx += bytes_in;
1048 }
1049
1050 next_frame:
1051 rxre->bytecnt = cpu_to_be16(0);
1052 wmb();
1053 rxre->cmdstat = cpu_to_be32(SDMA_DESC_CMDSTAT_O
1054 | SDMA_DESC_CMDSTAT_EI | SDMA_DESC_CMDSTAT_F
1055 | SDMA_DESC_CMDSTAT_L);
1056 wmb();
1057 dma_cache_sync(pi->port.dev, (void *)rxre, MPSC_RXRE_SIZE,
1058 DMA_BIDIRECTIONAL);
1059 #if defined(CONFIG_PPC32) && !defined(CONFIG_NOT_COHERENT_CACHE)
1060 if (pi->cache_mgmt) /* GT642[46]0 Res #COMM-2 */
1061 flush_dcache_range((ulong)rxre,
1062 (ulong)rxre + MPSC_RXRE_SIZE);
1063 #endif
1064
1065 /* Advance to next descriptor */
1066 pi->rxr_posn = (pi->rxr_posn + 1) & (MPSC_RXR_ENTRIES - 1);
1067 rxre = (struct mpsc_rx_desc *)
1068 (pi->rxr + (pi->rxr_posn * MPSC_RXRE_SIZE));
1069 dma_cache_sync(pi->port.dev, (void *)rxre, MPSC_RXRE_SIZE,
1070 DMA_FROM_DEVICE);
1071 #if defined(CONFIG_PPC32) && !defined(CONFIG_NOT_COHERENT_CACHE)
1072 if (pi->cache_mgmt) /* GT642[46]0 Res #COMM-2 */
1073 invalidate_dcache_range((ulong)rxre,
1074 (ulong)rxre + MPSC_RXRE_SIZE);
1075 #endif
1076 rc = 1;
1077 }
1078
1079 /* Restart rx engine, if its stopped */
1080 if ((readl(pi->sdma_base + SDMA_SDCM) & SDMA_SDCM_ERD) == 0)
1081 mpsc_start_rx(pi);
1082
1083 spin_unlock_irqrestore(&pi->port.lock, *flags);
1084 tty_flip_buffer_push(port);
1085 spin_lock_irqsave(&pi->port.lock, *flags);
1086 return rc;
1087 }
1088
mpsc_setup_tx_desc(struct mpsc_port_info * pi,u32 count,u32 intr)1089 static void mpsc_setup_tx_desc(struct mpsc_port_info *pi, u32 count, u32 intr)
1090 {
1091 struct mpsc_tx_desc *txre;
1092
1093 txre = (struct mpsc_tx_desc *)(pi->txr
1094 + (pi->txr_head * MPSC_TXRE_SIZE));
1095
1096 txre->bytecnt = cpu_to_be16(count);
1097 txre->shadow = txre->bytecnt;
1098 wmb(); /* ensure cmdstat is last field updated */
1099 txre->cmdstat = cpu_to_be32(SDMA_DESC_CMDSTAT_O | SDMA_DESC_CMDSTAT_F
1100 | SDMA_DESC_CMDSTAT_L
1101 | ((intr) ? SDMA_DESC_CMDSTAT_EI : 0));
1102 wmb();
1103 dma_cache_sync(pi->port.dev, (void *)txre, MPSC_TXRE_SIZE,
1104 DMA_BIDIRECTIONAL);
1105 #if defined(CONFIG_PPC32) && !defined(CONFIG_NOT_COHERENT_CACHE)
1106 if (pi->cache_mgmt) /* GT642[46]0 Res #COMM-2 */
1107 flush_dcache_range((ulong)txre,
1108 (ulong)txre + MPSC_TXRE_SIZE);
1109 #endif
1110 }
1111
mpsc_copy_tx_data(struct mpsc_port_info * pi)1112 static void mpsc_copy_tx_data(struct mpsc_port_info *pi)
1113 {
1114 struct circ_buf *xmit = &pi->port.state->xmit;
1115 u8 *bp;
1116 u32 i;
1117
1118 /* Make sure the desc ring isn't full */
1119 while (CIRC_CNT(pi->txr_head, pi->txr_tail, MPSC_TXR_ENTRIES)
1120 < (MPSC_TXR_ENTRIES - 1)) {
1121 if (pi->port.x_char) {
1122 /*
1123 * Ideally, we should use the TCS field in
1124 * CHR_1 to put the x_char out immediately but
1125 * errata prevents us from being able to read
1126 * CHR_2 to know that its safe to write to
1127 * CHR_1. Instead, just put it in-band with
1128 * all the other Tx data.
1129 */
1130 bp = pi->txb + (pi->txr_head * MPSC_TXBE_SIZE);
1131 *bp = pi->port.x_char;
1132 pi->port.x_char = 0;
1133 i = 1;
1134 } else if (!uart_circ_empty(xmit)
1135 && !uart_tx_stopped(&pi->port)) {
1136 i = min((u32)MPSC_TXBE_SIZE,
1137 (u32)uart_circ_chars_pending(xmit));
1138 i = min(i, (u32)CIRC_CNT_TO_END(xmit->head, xmit->tail,
1139 UART_XMIT_SIZE));
1140 bp = pi->txb + (pi->txr_head * MPSC_TXBE_SIZE);
1141 memcpy(bp, &xmit->buf[xmit->tail], i);
1142 xmit->tail = (xmit->tail + i) & (UART_XMIT_SIZE - 1);
1143
1144 if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
1145 uart_write_wakeup(&pi->port);
1146 } else { /* All tx data copied into ring bufs */
1147 return;
1148 }
1149
1150 dma_cache_sync(pi->port.dev, (void *)bp, MPSC_TXBE_SIZE,
1151 DMA_BIDIRECTIONAL);
1152 #if defined(CONFIG_PPC32) && !defined(CONFIG_NOT_COHERENT_CACHE)
1153 if (pi->cache_mgmt) /* GT642[46]0 Res #COMM-2 */
1154 flush_dcache_range((ulong)bp,
1155 (ulong)bp + MPSC_TXBE_SIZE);
1156 #endif
1157 mpsc_setup_tx_desc(pi, i, 1);
1158
1159 /* Advance to next descriptor */
1160 pi->txr_head = (pi->txr_head + 1) & (MPSC_TXR_ENTRIES - 1);
1161 }
1162 }
1163
mpsc_tx_intr(struct mpsc_port_info * pi)1164 static int mpsc_tx_intr(struct mpsc_port_info *pi)
1165 {
1166 struct mpsc_tx_desc *txre;
1167 int rc = 0;
1168 unsigned long iflags;
1169
1170 spin_lock_irqsave(&pi->tx_lock, iflags);
1171
1172 if (!mpsc_sdma_tx_active(pi)) {
1173 txre = (struct mpsc_tx_desc *)(pi->txr
1174 + (pi->txr_tail * MPSC_TXRE_SIZE));
1175
1176 dma_cache_sync(pi->port.dev, (void *)txre, MPSC_TXRE_SIZE,
1177 DMA_FROM_DEVICE);
1178 #if defined(CONFIG_PPC32) && !defined(CONFIG_NOT_COHERENT_CACHE)
1179 if (pi->cache_mgmt) /* GT642[46]0 Res #COMM-2 */
1180 invalidate_dcache_range((ulong)txre,
1181 (ulong)txre + MPSC_TXRE_SIZE);
1182 #endif
1183
1184 while (!(be32_to_cpu(txre->cmdstat) & SDMA_DESC_CMDSTAT_O)) {
1185 rc = 1;
1186 pi->port.icount.tx += be16_to_cpu(txre->bytecnt);
1187 pi->txr_tail = (pi->txr_tail+1) & (MPSC_TXR_ENTRIES-1);
1188
1189 /* If no more data to tx, fall out of loop */
1190 if (pi->txr_head == pi->txr_tail)
1191 break;
1192
1193 txre = (struct mpsc_tx_desc *)(pi->txr
1194 + (pi->txr_tail * MPSC_TXRE_SIZE));
1195 dma_cache_sync(pi->port.dev, (void *)txre,
1196 MPSC_TXRE_SIZE, DMA_FROM_DEVICE);
1197 #if defined(CONFIG_PPC32) && !defined(CONFIG_NOT_COHERENT_CACHE)
1198 if (pi->cache_mgmt) /* GT642[46]0 Res #COMM-2 */
1199 invalidate_dcache_range((ulong)txre,
1200 (ulong)txre + MPSC_TXRE_SIZE);
1201 #endif
1202 }
1203
1204 mpsc_copy_tx_data(pi);
1205 mpsc_sdma_start_tx(pi); /* start next desc if ready */
1206 }
1207
1208 spin_unlock_irqrestore(&pi->tx_lock, iflags);
1209 return rc;
1210 }
1211
1212 /*
1213 * This is the driver's interrupt handler. To avoid a race, we first clear
1214 * the interrupt, then handle any completed Rx/Tx descriptors. When done
1215 * handling those descriptors, we restart the Rx/Tx engines if they're stopped.
1216 */
mpsc_sdma_intr(int irq,void * dev_id)1217 static irqreturn_t mpsc_sdma_intr(int irq, void *dev_id)
1218 {
1219 struct mpsc_port_info *pi = dev_id;
1220 ulong iflags;
1221 int rc = IRQ_NONE;
1222
1223 pr_debug("mpsc_sdma_intr[%d]: SDMA Interrupt Received\n",pi->port.line);
1224
1225 spin_lock_irqsave(&pi->port.lock, iflags);
1226 mpsc_sdma_intr_ack(pi);
1227 if (mpsc_rx_intr(pi, &iflags))
1228 rc = IRQ_HANDLED;
1229 if (mpsc_tx_intr(pi))
1230 rc = IRQ_HANDLED;
1231 spin_unlock_irqrestore(&pi->port.lock, iflags);
1232
1233 pr_debug("mpsc_sdma_intr[%d]: SDMA Interrupt Handled\n", pi->port.line);
1234 return rc;
1235 }
1236
1237 /*
1238 ******************************************************************************
1239 *
1240 * serial_core.c Interface routines
1241 *
1242 ******************************************************************************
1243 */
mpsc_tx_empty(struct uart_port * port)1244 static uint mpsc_tx_empty(struct uart_port *port)
1245 {
1246 struct mpsc_port_info *pi =
1247 container_of(port, struct mpsc_port_info, port);
1248 ulong iflags;
1249 uint rc;
1250
1251 spin_lock_irqsave(&pi->port.lock, iflags);
1252 rc = mpsc_sdma_tx_active(pi) ? 0 : TIOCSER_TEMT;
1253 spin_unlock_irqrestore(&pi->port.lock, iflags);
1254
1255 return rc;
1256 }
1257
mpsc_set_mctrl(struct uart_port * port,uint mctrl)1258 static void mpsc_set_mctrl(struct uart_port *port, uint mctrl)
1259 {
1260 /* Have no way to set modem control lines AFAICT */
1261 }
1262
mpsc_get_mctrl(struct uart_port * port)1263 static uint mpsc_get_mctrl(struct uart_port *port)
1264 {
1265 struct mpsc_port_info *pi =
1266 container_of(port, struct mpsc_port_info, port);
1267 u32 mflags, status;
1268
1269 status = (pi->mirror_regs) ? pi->MPSC_CHR_10_m
1270 : readl(pi->mpsc_base + MPSC_CHR_10);
1271
1272 mflags = 0;
1273 if (status & 0x1)
1274 mflags |= TIOCM_CTS;
1275 if (status & 0x2)
1276 mflags |= TIOCM_CAR;
1277
1278 return mflags | TIOCM_DSR; /* No way to tell if DSR asserted */
1279 }
1280
mpsc_stop_tx(struct uart_port * port)1281 static void mpsc_stop_tx(struct uart_port *port)
1282 {
1283 struct mpsc_port_info *pi =
1284 container_of(port, struct mpsc_port_info, port);
1285
1286 pr_debug("mpsc_stop_tx[%d]\n", port->line);
1287
1288 mpsc_freeze(pi);
1289 }
1290
mpsc_start_tx(struct uart_port * port)1291 static void mpsc_start_tx(struct uart_port *port)
1292 {
1293 struct mpsc_port_info *pi =
1294 container_of(port, struct mpsc_port_info, port);
1295 unsigned long iflags;
1296
1297 spin_lock_irqsave(&pi->tx_lock, iflags);
1298
1299 mpsc_unfreeze(pi);
1300 mpsc_copy_tx_data(pi);
1301 mpsc_sdma_start_tx(pi);
1302
1303 spin_unlock_irqrestore(&pi->tx_lock, iflags);
1304
1305 pr_debug("mpsc_start_tx[%d]\n", port->line);
1306 }
1307
mpsc_start_rx(struct mpsc_port_info * pi)1308 static void mpsc_start_rx(struct mpsc_port_info *pi)
1309 {
1310 pr_debug("mpsc_start_rx[%d]: Starting...\n", pi->port.line);
1311
1312 if (pi->rcv_data) {
1313 mpsc_enter_hunt(pi);
1314 mpsc_sdma_cmd(pi, SDMA_SDCM_ERD);
1315 }
1316 }
1317
mpsc_stop_rx(struct uart_port * port)1318 static void mpsc_stop_rx(struct uart_port *port)
1319 {
1320 struct mpsc_port_info *pi =
1321 container_of(port, struct mpsc_port_info, port);
1322
1323 pr_debug("mpsc_stop_rx[%d]: Stopping...\n", port->line);
1324
1325 if (pi->mirror_regs) {
1326 writel(pi->MPSC_CHR_2_m | MPSC_CHR_2_RA,
1327 pi->mpsc_base + MPSC_CHR_2);
1328 /* Erratum prevents reading CHR_2 so just delay for a while */
1329 udelay(100);
1330 } else {
1331 writel(readl(pi->mpsc_base + MPSC_CHR_2) | MPSC_CHR_2_RA,
1332 pi->mpsc_base + MPSC_CHR_2);
1333
1334 while (readl(pi->mpsc_base + MPSC_CHR_2) & MPSC_CHR_2_RA)
1335 udelay(10);
1336 }
1337
1338 mpsc_sdma_cmd(pi, SDMA_SDCM_AR);
1339 }
1340
mpsc_break_ctl(struct uart_port * port,int ctl)1341 static void mpsc_break_ctl(struct uart_port *port, int ctl)
1342 {
1343 struct mpsc_port_info *pi =
1344 container_of(port, struct mpsc_port_info, port);
1345 ulong flags;
1346 u32 v;
1347
1348 v = ctl ? 0x00ff0000 : 0;
1349
1350 spin_lock_irqsave(&pi->port.lock, flags);
1351 if (pi->mirror_regs)
1352 pi->MPSC_CHR_1_m = v;
1353 writel(v, pi->mpsc_base + MPSC_CHR_1);
1354 spin_unlock_irqrestore(&pi->port.lock, flags);
1355 }
1356
mpsc_startup(struct uart_port * port)1357 static int mpsc_startup(struct uart_port *port)
1358 {
1359 struct mpsc_port_info *pi =
1360 container_of(port, struct mpsc_port_info, port);
1361 u32 flag = 0;
1362 int rc;
1363
1364 pr_debug("mpsc_startup[%d]: Starting up MPSC, irq: %d\n",
1365 port->line, pi->port.irq);
1366
1367 if ((rc = mpsc_make_ready(pi)) == 0) {
1368 /* Setup IRQ handler */
1369 mpsc_sdma_intr_ack(pi);
1370
1371 /* If irq's are shared, need to set flag */
1372 if (mpsc_ports[0].port.irq == mpsc_ports[1].port.irq)
1373 flag = IRQF_SHARED;
1374
1375 if (request_irq(pi->port.irq, mpsc_sdma_intr, flag,
1376 "mpsc-sdma", pi))
1377 printk(KERN_ERR "MPSC: Can't get SDMA IRQ %d\n",
1378 pi->port.irq);
1379
1380 mpsc_sdma_intr_unmask(pi, 0xf);
1381 mpsc_sdma_set_rx_ring(pi, (struct mpsc_rx_desc *)(pi->rxr_p
1382 + (pi->rxr_posn * MPSC_RXRE_SIZE)));
1383 }
1384
1385 return rc;
1386 }
1387
mpsc_shutdown(struct uart_port * port)1388 static void mpsc_shutdown(struct uart_port *port)
1389 {
1390 struct mpsc_port_info *pi =
1391 container_of(port, struct mpsc_port_info, port);
1392
1393 pr_debug("mpsc_shutdown[%d]: Shutting down MPSC\n", port->line);
1394
1395 mpsc_sdma_stop(pi);
1396 free_irq(pi->port.irq, pi);
1397 }
1398
mpsc_set_termios(struct uart_port * port,struct ktermios * termios,struct ktermios * old)1399 static void mpsc_set_termios(struct uart_port *port, struct ktermios *termios,
1400 struct ktermios *old)
1401 {
1402 struct mpsc_port_info *pi =
1403 container_of(port, struct mpsc_port_info, port);
1404 u32 baud;
1405 ulong flags;
1406 u32 chr_bits, stop_bits, par;
1407
1408 switch (termios->c_cflag & CSIZE) {
1409 case CS5:
1410 chr_bits = MPSC_MPCR_CL_5;
1411 break;
1412 case CS6:
1413 chr_bits = MPSC_MPCR_CL_6;
1414 break;
1415 case CS7:
1416 chr_bits = MPSC_MPCR_CL_7;
1417 break;
1418 case CS8:
1419 default:
1420 chr_bits = MPSC_MPCR_CL_8;
1421 break;
1422 }
1423
1424 if (termios->c_cflag & CSTOPB)
1425 stop_bits = MPSC_MPCR_SBL_2;
1426 else
1427 stop_bits = MPSC_MPCR_SBL_1;
1428
1429 par = MPSC_CHR_2_PAR_EVEN;
1430 if (termios->c_cflag & PARENB)
1431 if (termios->c_cflag & PARODD)
1432 par = MPSC_CHR_2_PAR_ODD;
1433 #ifdef CMSPAR
1434 if (termios->c_cflag & CMSPAR) {
1435 if (termios->c_cflag & PARODD)
1436 par = MPSC_CHR_2_PAR_MARK;
1437 else
1438 par = MPSC_CHR_2_PAR_SPACE;
1439 }
1440 #endif
1441
1442 baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk);
1443
1444 spin_lock_irqsave(&pi->port.lock, flags);
1445
1446 uart_update_timeout(port, termios->c_cflag, baud);
1447
1448 mpsc_set_char_length(pi, chr_bits);
1449 mpsc_set_stop_bit_length(pi, stop_bits);
1450 mpsc_set_parity(pi, par);
1451 mpsc_set_baudrate(pi, baud);
1452
1453 /* Characters/events to read */
1454 pi->port.read_status_mask = SDMA_DESC_CMDSTAT_OR;
1455
1456 if (termios->c_iflag & INPCK)
1457 pi->port.read_status_mask |= SDMA_DESC_CMDSTAT_PE
1458 | SDMA_DESC_CMDSTAT_FR;
1459
1460 if (termios->c_iflag & (IGNBRK | BRKINT | PARMRK))
1461 pi->port.read_status_mask |= SDMA_DESC_CMDSTAT_BR;
1462
1463 /* Characters/events to ignore */
1464 pi->port.ignore_status_mask = 0;
1465
1466 if (termios->c_iflag & IGNPAR)
1467 pi->port.ignore_status_mask |= SDMA_DESC_CMDSTAT_PE
1468 | SDMA_DESC_CMDSTAT_FR;
1469
1470 if (termios->c_iflag & IGNBRK) {
1471 pi->port.ignore_status_mask |= SDMA_DESC_CMDSTAT_BR;
1472
1473 if (termios->c_iflag & IGNPAR)
1474 pi->port.ignore_status_mask |= SDMA_DESC_CMDSTAT_OR;
1475 }
1476
1477 if ((termios->c_cflag & CREAD)) {
1478 if (!pi->rcv_data) {
1479 pi->rcv_data = 1;
1480 mpsc_start_rx(pi);
1481 }
1482 } else if (pi->rcv_data) {
1483 mpsc_stop_rx(port);
1484 pi->rcv_data = 0;
1485 }
1486
1487 spin_unlock_irqrestore(&pi->port.lock, flags);
1488 }
1489
mpsc_type(struct uart_port * port)1490 static const char *mpsc_type(struct uart_port *port)
1491 {
1492 pr_debug("mpsc_type[%d]: port type: %s\n", port->line,MPSC_DRIVER_NAME);
1493 return MPSC_DRIVER_NAME;
1494 }
1495
mpsc_request_port(struct uart_port * port)1496 static int mpsc_request_port(struct uart_port *port)
1497 {
1498 /* Should make chip/platform specific call */
1499 return 0;
1500 }
1501
mpsc_release_port(struct uart_port * port)1502 static void mpsc_release_port(struct uart_port *port)
1503 {
1504 struct mpsc_port_info *pi =
1505 container_of(port, struct mpsc_port_info, port);
1506
1507 if (pi->ready) {
1508 mpsc_uninit_rings(pi);
1509 mpsc_free_ring_mem(pi);
1510 pi->ready = 0;
1511 }
1512 }
1513
mpsc_config_port(struct uart_port * port,int flags)1514 static void mpsc_config_port(struct uart_port *port, int flags)
1515 {
1516 }
1517
mpsc_verify_port(struct uart_port * port,struct serial_struct * ser)1518 static int mpsc_verify_port(struct uart_port *port, struct serial_struct *ser)
1519 {
1520 struct mpsc_port_info *pi =
1521 container_of(port, struct mpsc_port_info, port);
1522 int rc = 0;
1523
1524 pr_debug("mpsc_verify_port[%d]: Verifying port data\n", pi->port.line);
1525
1526 if (ser->type != PORT_UNKNOWN && ser->type != PORT_MPSC)
1527 rc = -EINVAL;
1528 else if (pi->port.irq != ser->irq)
1529 rc = -EINVAL;
1530 else if (ser->io_type != SERIAL_IO_MEM)
1531 rc = -EINVAL;
1532 else if (pi->port.uartclk / 16 != ser->baud_base) /* Not sure */
1533 rc = -EINVAL;
1534 else if ((void *)pi->port.mapbase != ser->iomem_base)
1535 rc = -EINVAL;
1536 else if (pi->port.iobase != ser->port)
1537 rc = -EINVAL;
1538 else if (ser->hub6 != 0)
1539 rc = -EINVAL;
1540
1541 return rc;
1542 }
1543 #ifdef CONFIG_CONSOLE_POLL
1544 /* Serial polling routines for writing and reading from the uart while
1545 * in an interrupt or debug context.
1546 */
1547
1548 static char poll_buf[2048];
1549 static int poll_ptr;
1550 static int poll_cnt;
1551 static void mpsc_put_poll_char(struct uart_port *port,
1552 unsigned char c);
1553
mpsc_get_poll_char(struct uart_port * port)1554 static int mpsc_get_poll_char(struct uart_port *port)
1555 {
1556 struct mpsc_port_info *pi =
1557 container_of(port, struct mpsc_port_info, port);
1558 struct mpsc_rx_desc *rxre;
1559 u32 cmdstat, bytes_in, i;
1560 u8 *bp;
1561
1562 if (!serial_polled)
1563 serial_polled = 1;
1564
1565 pr_debug("mpsc_rx_intr[%d]: Handling Rx intr\n", pi->port.line);
1566
1567 if (poll_cnt) {
1568 poll_cnt--;
1569 return poll_buf[poll_ptr++];
1570 }
1571 poll_ptr = 0;
1572 poll_cnt = 0;
1573
1574 while (poll_cnt == 0) {
1575 rxre = (struct mpsc_rx_desc *)(pi->rxr +
1576 (pi->rxr_posn*MPSC_RXRE_SIZE));
1577 dma_cache_sync(pi->port.dev, (void *)rxre,
1578 MPSC_RXRE_SIZE, DMA_FROM_DEVICE);
1579 #if defined(CONFIG_PPC32) && !defined(CONFIG_NOT_COHERENT_CACHE)
1580 if (pi->cache_mgmt) /* GT642[46]0 Res #COMM-2 */
1581 invalidate_dcache_range((ulong)rxre,
1582 (ulong)rxre + MPSC_RXRE_SIZE);
1583 #endif
1584 /*
1585 * Loop through Rx descriptors handling ones that have
1586 * been completed.
1587 */
1588 while (poll_cnt == 0 &&
1589 !((cmdstat = be32_to_cpu(rxre->cmdstat)) &
1590 SDMA_DESC_CMDSTAT_O)){
1591 bytes_in = be16_to_cpu(rxre->bytecnt);
1592 bp = pi->rxb + (pi->rxr_posn * MPSC_RXBE_SIZE);
1593 dma_cache_sync(pi->port.dev, (void *) bp,
1594 MPSC_RXBE_SIZE, DMA_FROM_DEVICE);
1595 #if defined(CONFIG_PPC32) && !defined(CONFIG_NOT_COHERENT_CACHE)
1596 if (pi->cache_mgmt) /* GT642[46]0 Res #COMM-2 */
1597 invalidate_dcache_range((ulong)bp,
1598 (ulong)bp + MPSC_RXBE_SIZE);
1599 #endif
1600 if ((unlikely(cmdstat & (SDMA_DESC_CMDSTAT_BR |
1601 SDMA_DESC_CMDSTAT_FR | SDMA_DESC_CMDSTAT_OR))) &&
1602 !(cmdstat & pi->port.ignore_status_mask)) {
1603 poll_buf[poll_cnt] = *bp;
1604 poll_cnt++;
1605 } else {
1606 for (i = 0; i < bytes_in; i++) {
1607 poll_buf[poll_cnt] = *bp++;
1608 poll_cnt++;
1609 }
1610 pi->port.icount.rx += bytes_in;
1611 }
1612 rxre->bytecnt = cpu_to_be16(0);
1613 wmb();
1614 rxre->cmdstat = cpu_to_be32(SDMA_DESC_CMDSTAT_O |
1615 SDMA_DESC_CMDSTAT_EI |
1616 SDMA_DESC_CMDSTAT_F |
1617 SDMA_DESC_CMDSTAT_L);
1618 wmb();
1619 dma_cache_sync(pi->port.dev, (void *)rxre,
1620 MPSC_RXRE_SIZE, DMA_BIDIRECTIONAL);
1621 #if defined(CONFIG_PPC32) && !defined(CONFIG_NOT_COHERENT_CACHE)
1622 if (pi->cache_mgmt) /* GT642[46]0 Res #COMM-2 */
1623 flush_dcache_range((ulong)rxre,
1624 (ulong)rxre + MPSC_RXRE_SIZE);
1625 #endif
1626
1627 /* Advance to next descriptor */
1628 pi->rxr_posn = (pi->rxr_posn + 1) &
1629 (MPSC_RXR_ENTRIES - 1);
1630 rxre = (struct mpsc_rx_desc *)(pi->rxr +
1631 (pi->rxr_posn * MPSC_RXRE_SIZE));
1632 dma_cache_sync(pi->port.dev, (void *)rxre,
1633 MPSC_RXRE_SIZE, DMA_FROM_DEVICE);
1634 #if defined(CONFIG_PPC32) && !defined(CONFIG_NOT_COHERENT_CACHE)
1635 if (pi->cache_mgmt) /* GT642[46]0 Res #COMM-2 */
1636 invalidate_dcache_range((ulong)rxre,
1637 (ulong)rxre + MPSC_RXRE_SIZE);
1638 #endif
1639 }
1640
1641 /* Restart rx engine, if its stopped */
1642 if ((readl(pi->sdma_base + SDMA_SDCM) & SDMA_SDCM_ERD) == 0)
1643 mpsc_start_rx(pi);
1644 }
1645 if (poll_cnt) {
1646 poll_cnt--;
1647 return poll_buf[poll_ptr++];
1648 }
1649
1650 return 0;
1651 }
1652
1653
mpsc_put_poll_char(struct uart_port * port,unsigned char c)1654 static void mpsc_put_poll_char(struct uart_port *port,
1655 unsigned char c)
1656 {
1657 struct mpsc_port_info *pi =
1658 container_of(port, struct mpsc_port_info, port);
1659 u32 data;
1660
1661 data = readl(pi->mpsc_base + MPSC_MPCR);
1662 writeb(c, pi->mpsc_base + MPSC_CHR_1);
1663 mb();
1664 data = readl(pi->mpsc_base + MPSC_CHR_2);
1665 data |= MPSC_CHR_2_TTCS;
1666 writel(data, pi->mpsc_base + MPSC_CHR_2);
1667 mb();
1668
1669 while (readl(pi->mpsc_base + MPSC_CHR_2) & MPSC_CHR_2_TTCS);
1670 }
1671 #endif
1672
1673 static struct uart_ops mpsc_pops = {
1674 .tx_empty = mpsc_tx_empty,
1675 .set_mctrl = mpsc_set_mctrl,
1676 .get_mctrl = mpsc_get_mctrl,
1677 .stop_tx = mpsc_stop_tx,
1678 .start_tx = mpsc_start_tx,
1679 .stop_rx = mpsc_stop_rx,
1680 .break_ctl = mpsc_break_ctl,
1681 .startup = mpsc_startup,
1682 .shutdown = mpsc_shutdown,
1683 .set_termios = mpsc_set_termios,
1684 .type = mpsc_type,
1685 .release_port = mpsc_release_port,
1686 .request_port = mpsc_request_port,
1687 .config_port = mpsc_config_port,
1688 .verify_port = mpsc_verify_port,
1689 #ifdef CONFIG_CONSOLE_POLL
1690 .poll_get_char = mpsc_get_poll_char,
1691 .poll_put_char = mpsc_put_poll_char,
1692 #endif
1693 };
1694
1695 /*
1696 ******************************************************************************
1697 *
1698 * Console Interface Routines
1699 *
1700 ******************************************************************************
1701 */
1702
1703 #ifdef CONFIG_SERIAL_MPSC_CONSOLE
mpsc_console_write(struct console * co,const char * s,uint count)1704 static void mpsc_console_write(struct console *co, const char *s, uint count)
1705 {
1706 struct mpsc_port_info *pi = &mpsc_ports[co->index];
1707 u8 *bp, *dp, add_cr = 0;
1708 int i;
1709 unsigned long iflags;
1710
1711 spin_lock_irqsave(&pi->tx_lock, iflags);
1712
1713 while (pi->txr_head != pi->txr_tail) {
1714 while (mpsc_sdma_tx_active(pi))
1715 udelay(100);
1716 mpsc_sdma_intr_ack(pi);
1717 mpsc_tx_intr(pi);
1718 }
1719
1720 while (mpsc_sdma_tx_active(pi))
1721 udelay(100);
1722
1723 while (count > 0) {
1724 bp = dp = pi->txb + (pi->txr_head * MPSC_TXBE_SIZE);
1725
1726 for (i = 0; i < MPSC_TXBE_SIZE; i++) {
1727 if (count == 0)
1728 break;
1729
1730 if (add_cr) {
1731 *(dp++) = '\r';
1732 add_cr = 0;
1733 } else {
1734 *(dp++) = *s;
1735
1736 if (*(s++) == '\n') { /* add '\r' after '\n' */
1737 add_cr = 1;
1738 count++;
1739 }
1740 }
1741
1742 count--;
1743 }
1744
1745 dma_cache_sync(pi->port.dev, (void *)bp, MPSC_TXBE_SIZE,
1746 DMA_BIDIRECTIONAL);
1747 #if defined(CONFIG_PPC32) && !defined(CONFIG_NOT_COHERENT_CACHE)
1748 if (pi->cache_mgmt) /* GT642[46]0 Res #COMM-2 */
1749 flush_dcache_range((ulong)bp,
1750 (ulong)bp + MPSC_TXBE_SIZE);
1751 #endif
1752 mpsc_setup_tx_desc(pi, i, 0);
1753 pi->txr_head = (pi->txr_head + 1) & (MPSC_TXR_ENTRIES - 1);
1754 mpsc_sdma_start_tx(pi);
1755
1756 while (mpsc_sdma_tx_active(pi))
1757 udelay(100);
1758
1759 pi->txr_tail = (pi->txr_tail + 1) & (MPSC_TXR_ENTRIES - 1);
1760 }
1761
1762 spin_unlock_irqrestore(&pi->tx_lock, iflags);
1763 }
1764
mpsc_console_setup(struct console * co,char * options)1765 static int __init mpsc_console_setup(struct console *co, char *options)
1766 {
1767 struct mpsc_port_info *pi;
1768 int baud, bits, parity, flow;
1769
1770 pr_debug("mpsc_console_setup[%d]: options: %s\n", co->index, options);
1771
1772 if (co->index >= MPSC_NUM_CTLRS)
1773 co->index = 0;
1774
1775 pi = &mpsc_ports[co->index];
1776
1777 baud = pi->default_baud;
1778 bits = pi->default_bits;
1779 parity = pi->default_parity;
1780 flow = pi->default_flow;
1781
1782 if (!pi->port.ops)
1783 return -ENODEV;
1784
1785 spin_lock_init(&pi->port.lock); /* Temporary fix--copied from 8250.c */
1786
1787 if (options)
1788 uart_parse_options(options, &baud, &parity, &bits, &flow);
1789
1790 return uart_set_options(&pi->port, co, baud, parity, bits, flow);
1791 }
1792
1793 static struct console mpsc_console = {
1794 .name = MPSC_DEV_NAME,
1795 .write = mpsc_console_write,
1796 .device = uart_console_device,
1797 .setup = mpsc_console_setup,
1798 .flags = CON_PRINTBUFFER,
1799 .index = -1,
1800 .data = &mpsc_reg,
1801 };
1802
mpsc_late_console_init(void)1803 static int __init mpsc_late_console_init(void)
1804 {
1805 pr_debug("mpsc_late_console_init: Enter\n");
1806
1807 if (!(mpsc_console.flags & CON_ENABLED))
1808 register_console(&mpsc_console);
1809 return 0;
1810 }
1811
1812 late_initcall(mpsc_late_console_init);
1813
1814 #define MPSC_CONSOLE &mpsc_console
1815 #else
1816 #define MPSC_CONSOLE NULL
1817 #endif
1818 /*
1819 ******************************************************************************
1820 *
1821 * Dummy Platform Driver to extract & map shared register regions
1822 *
1823 ******************************************************************************
1824 */
mpsc_resource_err(char * s)1825 static void mpsc_resource_err(char *s)
1826 {
1827 printk(KERN_WARNING "MPSC: Platform device resource error in %s\n", s);
1828 }
1829
mpsc_shared_map_regs(struct platform_device * pd)1830 static int mpsc_shared_map_regs(struct platform_device *pd)
1831 {
1832 struct resource *r;
1833
1834 if ((r = platform_get_resource(pd, IORESOURCE_MEM,
1835 MPSC_ROUTING_BASE_ORDER))
1836 && request_mem_region(r->start,
1837 MPSC_ROUTING_REG_BLOCK_SIZE,
1838 "mpsc_routing_regs")) {
1839 mpsc_shared_regs.mpsc_routing_base = ioremap(r->start,
1840 MPSC_ROUTING_REG_BLOCK_SIZE);
1841 mpsc_shared_regs.mpsc_routing_base_p = r->start;
1842 } else {
1843 mpsc_resource_err("MPSC routing base");
1844 return -ENOMEM;
1845 }
1846
1847 if ((r = platform_get_resource(pd, IORESOURCE_MEM,
1848 MPSC_SDMA_INTR_BASE_ORDER))
1849 && request_mem_region(r->start,
1850 MPSC_SDMA_INTR_REG_BLOCK_SIZE,
1851 "sdma_intr_regs")) {
1852 mpsc_shared_regs.sdma_intr_base = ioremap(r->start,
1853 MPSC_SDMA_INTR_REG_BLOCK_SIZE);
1854 mpsc_shared_regs.sdma_intr_base_p = r->start;
1855 } else {
1856 iounmap(mpsc_shared_regs.mpsc_routing_base);
1857 release_mem_region(mpsc_shared_regs.mpsc_routing_base_p,
1858 MPSC_ROUTING_REG_BLOCK_SIZE);
1859 mpsc_resource_err("SDMA intr base");
1860 return -ENOMEM;
1861 }
1862
1863 return 0;
1864 }
1865
mpsc_shared_unmap_regs(void)1866 static void mpsc_shared_unmap_regs(void)
1867 {
1868 if (mpsc_shared_regs.mpsc_routing_base) {
1869 iounmap(mpsc_shared_regs.mpsc_routing_base);
1870 release_mem_region(mpsc_shared_regs.mpsc_routing_base_p,
1871 MPSC_ROUTING_REG_BLOCK_SIZE);
1872 }
1873 if (mpsc_shared_regs.sdma_intr_base) {
1874 iounmap(mpsc_shared_regs.sdma_intr_base);
1875 release_mem_region(mpsc_shared_regs.sdma_intr_base_p,
1876 MPSC_SDMA_INTR_REG_BLOCK_SIZE);
1877 }
1878
1879 mpsc_shared_regs.mpsc_routing_base = NULL;
1880 mpsc_shared_regs.sdma_intr_base = NULL;
1881
1882 mpsc_shared_regs.mpsc_routing_base_p = 0;
1883 mpsc_shared_regs.sdma_intr_base_p = 0;
1884 }
1885
mpsc_shared_drv_probe(struct platform_device * dev)1886 static int mpsc_shared_drv_probe(struct platform_device *dev)
1887 {
1888 struct mpsc_shared_pdata *pdata;
1889 int rc;
1890
1891 if (dev->id != 0)
1892 return -ENODEV;
1893
1894 rc = mpsc_shared_map_regs(dev);
1895 if (rc)
1896 return rc;
1897
1898 pdata = dev_get_platdata(&dev->dev);
1899
1900 mpsc_shared_regs.MPSC_MRR_m = pdata->mrr_val;
1901 mpsc_shared_regs.MPSC_RCRR_m= pdata->rcrr_val;
1902 mpsc_shared_regs.MPSC_TCRR_m= pdata->tcrr_val;
1903 mpsc_shared_regs.SDMA_INTR_CAUSE_m = pdata->intr_cause_val;
1904 mpsc_shared_regs.SDMA_INTR_MASK_m = pdata->intr_mask_val;
1905
1906 return 0;
1907 }
1908
mpsc_shared_drv_remove(struct platform_device * dev)1909 static int mpsc_shared_drv_remove(struct platform_device *dev)
1910 {
1911 if (dev->id != 0)
1912 return -ENODEV;
1913
1914 mpsc_shared_unmap_regs();
1915 mpsc_shared_regs.MPSC_MRR_m = 0;
1916 mpsc_shared_regs.MPSC_RCRR_m = 0;
1917 mpsc_shared_regs.MPSC_TCRR_m = 0;
1918 mpsc_shared_regs.SDMA_INTR_CAUSE_m = 0;
1919 mpsc_shared_regs.SDMA_INTR_MASK_m = 0;
1920
1921 return 0;
1922 }
1923
1924 static struct platform_driver mpsc_shared_driver = {
1925 .probe = mpsc_shared_drv_probe,
1926 .remove = mpsc_shared_drv_remove,
1927 .driver = {
1928 .name = MPSC_SHARED_NAME,
1929 },
1930 };
1931
1932 /*
1933 ******************************************************************************
1934 *
1935 * Driver Interface Routines
1936 *
1937 ******************************************************************************
1938 */
1939 static struct uart_driver mpsc_reg = {
1940 .owner = THIS_MODULE,
1941 .driver_name = MPSC_DRIVER_NAME,
1942 .dev_name = MPSC_DEV_NAME,
1943 .major = MPSC_MAJOR,
1944 .minor = MPSC_MINOR_START,
1945 .nr = MPSC_NUM_CTLRS,
1946 .cons = MPSC_CONSOLE,
1947 };
1948
mpsc_drv_map_regs(struct mpsc_port_info * pi,struct platform_device * pd)1949 static int mpsc_drv_map_regs(struct mpsc_port_info *pi,
1950 struct platform_device *pd)
1951 {
1952 struct resource *r;
1953
1954 if ((r = platform_get_resource(pd, IORESOURCE_MEM, MPSC_BASE_ORDER))
1955 && request_mem_region(r->start, MPSC_REG_BLOCK_SIZE,
1956 "mpsc_regs")) {
1957 pi->mpsc_base = ioremap(r->start, MPSC_REG_BLOCK_SIZE);
1958 pi->mpsc_base_p = r->start;
1959 } else {
1960 mpsc_resource_err("MPSC base");
1961 goto err;
1962 }
1963
1964 if ((r = platform_get_resource(pd, IORESOURCE_MEM,
1965 MPSC_SDMA_BASE_ORDER))
1966 && request_mem_region(r->start,
1967 MPSC_SDMA_REG_BLOCK_SIZE, "sdma_regs")) {
1968 pi->sdma_base = ioremap(r->start,MPSC_SDMA_REG_BLOCK_SIZE);
1969 pi->sdma_base_p = r->start;
1970 } else {
1971 mpsc_resource_err("SDMA base");
1972 goto err;
1973 }
1974
1975 if ((r = platform_get_resource(pd,IORESOURCE_MEM,MPSC_BRG_BASE_ORDER))
1976 && request_mem_region(r->start,
1977 MPSC_BRG_REG_BLOCK_SIZE, "brg_regs")) {
1978 pi->brg_base = ioremap(r->start, MPSC_BRG_REG_BLOCK_SIZE);
1979 pi->brg_base_p = r->start;
1980 } else {
1981 mpsc_resource_err("BRG base");
1982 goto err;
1983 }
1984 return 0;
1985
1986 err:
1987 if (pi->sdma_base) {
1988 iounmap(pi->sdma_base);
1989 pi->sdma_base = NULL;
1990 }
1991 if (pi->mpsc_base) {
1992 iounmap(pi->mpsc_base);
1993 pi->mpsc_base = NULL;
1994 }
1995 return -ENOMEM;
1996 }
1997
mpsc_drv_unmap_regs(struct mpsc_port_info * pi)1998 static void mpsc_drv_unmap_regs(struct mpsc_port_info *pi)
1999 {
2000 if (pi->mpsc_base) {
2001 iounmap(pi->mpsc_base);
2002 release_mem_region(pi->mpsc_base_p, MPSC_REG_BLOCK_SIZE);
2003 }
2004 if (pi->sdma_base) {
2005 iounmap(pi->sdma_base);
2006 release_mem_region(pi->sdma_base_p, MPSC_SDMA_REG_BLOCK_SIZE);
2007 }
2008 if (pi->brg_base) {
2009 iounmap(pi->brg_base);
2010 release_mem_region(pi->brg_base_p, MPSC_BRG_REG_BLOCK_SIZE);
2011 }
2012
2013 pi->mpsc_base = NULL;
2014 pi->sdma_base = NULL;
2015 pi->brg_base = NULL;
2016
2017 pi->mpsc_base_p = 0;
2018 pi->sdma_base_p = 0;
2019 pi->brg_base_p = 0;
2020 }
2021
mpsc_drv_get_platform_data(struct mpsc_port_info * pi,struct platform_device * pd,int num)2022 static void mpsc_drv_get_platform_data(struct mpsc_port_info *pi,
2023 struct platform_device *pd, int num)
2024 {
2025 struct mpsc_pdata *pdata;
2026
2027 pdata = dev_get_platdata(&pd->dev);
2028
2029 pi->port.uartclk = pdata->brg_clk_freq;
2030 pi->port.iotype = UPIO_MEM;
2031 pi->port.line = num;
2032 pi->port.type = PORT_MPSC;
2033 pi->port.fifosize = MPSC_TXBE_SIZE;
2034 pi->port.membase = pi->mpsc_base;
2035 pi->port.mapbase = (ulong)pi->mpsc_base;
2036 pi->port.ops = &mpsc_pops;
2037
2038 pi->mirror_regs = pdata->mirror_regs;
2039 pi->cache_mgmt = pdata->cache_mgmt;
2040 pi->brg_can_tune = pdata->brg_can_tune;
2041 pi->brg_clk_src = pdata->brg_clk_src;
2042 pi->mpsc_max_idle = pdata->max_idle;
2043 pi->default_baud = pdata->default_baud;
2044 pi->default_bits = pdata->default_bits;
2045 pi->default_parity = pdata->default_parity;
2046 pi->default_flow = pdata->default_flow;
2047
2048 /* Initial values of mirrored regs */
2049 pi->MPSC_CHR_1_m = pdata->chr_1_val;
2050 pi->MPSC_CHR_2_m = pdata->chr_2_val;
2051 pi->MPSC_CHR_10_m = pdata->chr_10_val;
2052 pi->MPSC_MPCR_m = pdata->mpcr_val;
2053 pi->BRG_BCR_m = pdata->bcr_val;
2054
2055 pi->shared_regs = &mpsc_shared_regs;
2056
2057 pi->port.irq = platform_get_irq(pd, 0);
2058 }
2059
mpsc_drv_probe(struct platform_device * dev)2060 static int mpsc_drv_probe(struct platform_device *dev)
2061 {
2062 struct mpsc_port_info *pi;
2063 int rc;
2064
2065 dev_dbg(&dev->dev, "mpsc_drv_probe: Adding MPSC %d\n", dev->id);
2066
2067 if (dev->id >= MPSC_NUM_CTLRS)
2068 return -ENODEV;
2069
2070 pi = &mpsc_ports[dev->id];
2071
2072 rc = mpsc_drv_map_regs(pi, dev);
2073 if (rc)
2074 return rc;
2075
2076 mpsc_drv_get_platform_data(pi, dev, dev->id);
2077 pi->port.dev = &dev->dev;
2078
2079 rc = mpsc_make_ready(pi);
2080 if (rc)
2081 goto err_unmap;
2082
2083 spin_lock_init(&pi->tx_lock);
2084 rc = uart_add_one_port(&mpsc_reg, &pi->port);
2085 if (rc)
2086 goto err_relport;
2087
2088 return 0;
2089 err_relport:
2090 mpsc_release_port(&pi->port);
2091 err_unmap:
2092 mpsc_drv_unmap_regs(pi);
2093 return rc;
2094 }
2095
2096 static struct platform_driver mpsc_driver = {
2097 .probe = mpsc_drv_probe,
2098 .driver = {
2099 .name = MPSC_CTLR_NAME,
2100 .suppress_bind_attrs = true,
2101 },
2102 };
2103
mpsc_drv_init(void)2104 static int __init mpsc_drv_init(void)
2105 {
2106 int rc;
2107
2108 printk(KERN_INFO "Serial: MPSC driver\n");
2109
2110 memset(mpsc_ports, 0, sizeof(mpsc_ports));
2111 memset(&mpsc_shared_regs, 0, sizeof(mpsc_shared_regs));
2112
2113 rc = uart_register_driver(&mpsc_reg);
2114 if (rc)
2115 return rc;
2116
2117 rc = platform_driver_register(&mpsc_shared_driver);
2118 if (rc)
2119 goto err_unreg_uart;
2120
2121 rc = platform_driver_register(&mpsc_driver);
2122 if (rc)
2123 goto err_unreg_plat;
2124
2125 return 0;
2126 err_unreg_plat:
2127 platform_driver_unregister(&mpsc_shared_driver);
2128 err_unreg_uart:
2129 uart_unregister_driver(&mpsc_reg);
2130 return rc;
2131 }
2132 device_initcall(mpsc_drv_init);
2133
2134 /*
2135 MODULE_AUTHOR("Mark A. Greer <mgreer@mvista.com>");
2136 MODULE_DESCRIPTION("Generic Marvell MPSC serial/UART driver");
2137 MODULE_LICENSE("GPL");
2138 */
2139