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bfin_serial.h
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1 /*
2  * bfin_serial.h - Blackfin UART/Serial definitions
3  *
4  * Copyright 2006-2010 Analog Devices Inc.
5  *
6  * Licensed under the GPL-2 or later.
7  */
8 
9 #ifndef __BFIN_ASM_SERIAL_H__
10 #define __BFIN_ASM_SERIAL_H__
11 
12 #include <linux/serial_core.h>
13 #include <linux/spinlock.h>
14 #include <mach/anomaly.h>
15 #include <mach/bfin_serial.h>
16 
17 #if defined(CONFIG_BFIN_UART0_CTSRTS) || \
18  defined(CONFIG_BFIN_UART1_CTSRTS) || \
19  defined(CONFIG_BFIN_UART2_CTSRTS) || \
20  defined(CONFIG_BFIN_UART3_CTSRTS)
21 # if defined(BFIN_UART_BF54X_STYLE) || defined(BFIN_UART_BF60X_STYLE)
22 # define CONFIG_SERIAL_BFIN_HARD_CTSRTS
23 # else
24 # define CONFIG_SERIAL_BFIN_CTSRTS
25 # endif
26 #endif
27 
28 struct circ_buf;
29 struct timer_list;
30 struct work_struct;
31 
32 struct bfin_serial_port {
33  struct uart_port port;
34  unsigned int old_status;
35  int tx_irq;
36  int rx_irq;
37  int status_irq;
38 #ifndef BFIN_UART_BF54X_STYLE
39  unsigned int lsr;
40 #endif
41 #ifdef CONFIG_SERIAL_BFIN_DMA
42  int tx_done;
43  int tx_count;
44  struct circ_buf rx_dma_buf;
45  struct timer_list rx_dma_timer;
46  int rx_dma_nrows;
47  spinlock_t rx_lock;
48  unsigned int tx_dma_channel;
49  unsigned int rx_dma_channel;
50  struct work_struct tx_dma_workqueue;
51 #elif ANOMALY_05000363
52  unsigned int anomaly_threshold;
53 #endif
54 #if defined(CONFIG_SERIAL_BFIN_CTSRTS) || \
55  defined(CONFIG_SERIAL_BFIN_HARD_CTSRTS)
56  int cts_pin;
57  int rts_pin;
58 #endif
59 };
60 
61 #ifdef BFIN_UART_BF60X_STYLE
62 
63 /* UART_CTL Masks */
64 #define UCEN 0x1 /* Enable UARTx Clocks */
65 #define LOOP_ENA 0x2 /* Loopback Mode Enable */
66 #define UMOD_MDB 0x10 /* Enable MDB Mode */
67 #define UMOD_IRDA 0x20 /* Enable IrDA Mode */
68 #define UMOD_MASK 0x30 /* Uart Mode Mask */
69 #define WLS(x) (((x-5) & 0x03) << 8) /* Word Length Select */
70 #define WLS_MASK 0x300 /* Word length Select Mask */
71 #define WLS_OFFSET 8 /* Word length Select Offset */
72 #define STB 0x1000 /* Stop Bits */
73 #define STBH 0x2000 /* Half Stop Bits */
74 #define PEN 0x4000 /* Parity Enable */
75 #define EPS 0x8000 /* Even Parity Select */
76 #define STP 0x10000 /* Stick Parity */
77 #define FPE 0x20000 /* Force Parity Error On Transmit */
78 #define FFE 0x40000 /* Force Framing Error On Transmit */
79 #define SB 0x80000 /* Set Break */
80 #define LCR_MASK (SB | STP | EPS | PEN | STB | WLS_MASK)
81 #define FCPOL 0x400000 /* Flow Control Pin Polarity */
82 #define RPOLC 0x800000 /* IrDA RX Polarity Change */
83 #define TPOLC 0x1000000 /* IrDA TX Polarity Change */
84 #define MRTS 0x2000000 /* Manual Request To Send */
85 #define XOFF 0x4000000 /* Transmitter Off */
86 #define ARTS 0x8000000 /* Automatic Request To Send */
87 #define ACTS 0x10000000 /* Automatic Clear To Send */
88 #define RFIT 0x20000000 /* Receive FIFO IRQ Threshold */
89 #define RFRT 0x40000000 /* Receive FIFO RTS Threshold */
90 
91 /* UART_STAT Masks */
92 #define DR 0x01 /* Data Ready */
93 #define OE 0x02 /* Overrun Error */
94 #define PE 0x04 /* Parity Error */
95 #define FE 0x08 /* Framing Error */
96 #define BI 0x10 /* Break Interrupt */
97 #define THRE 0x20 /* THR Empty */
98 #define TEMT 0x80 /* TSR and UART_THR Empty */
99 #define TFI 0x100 /* Transmission Finished Indicator */
100 
101 #define ASTKY 0x200 /* Address Sticky */
102 #define ADDR 0x400 /* Address bit status */
103 #define RO 0x800 /* Reception Ongoing */
104 #define SCTS 0x1000 /* Sticky CTS */
105 #define CTS 0x10000 /* Clear To Send */
106 #define RFCS 0x20000 /* Receive FIFO Count Status */
107 
108 /* UART_CLOCK Masks */
109 #define EDBO 0x80000000 /* Enable Devide by One */
110 
111 #else /* BFIN_UART_BF60X_STYLE */
112 
113 /* UART_LCR Masks */
114 #define WLS(x) (((x)-5) & 0x03) /* Word Length Select */
115 #define WLS_MASK 0x03 /* Word length Select Mask */
116 #define WLS_OFFSET 0 /* Word length Select Offset */
117 #define STB 0x04 /* Stop Bits */
118 #define PEN 0x08 /* Parity Enable */
119 #define EPS 0x10 /* Even Parity Select */
120 #define STP 0x20 /* Stick Parity */
121 #define SB 0x40 /* Set Break */
122 #define DLAB 0x80 /* Divisor Latch Access */
123 #define LCR_MASK (SB | STP | EPS | PEN | STB | WLS_MASK)
124 
125 /* UART_LSR Masks */
126 #define DR 0x01 /* Data Ready */
127 #define OE 0x02 /* Overrun Error */
128 #define PE 0x04 /* Parity Error */
129 #define FE 0x08 /* Framing Error */
130 #define BI 0x10 /* Break Interrupt */
131 #define THRE 0x20 /* THR Empty */
132 #define TEMT 0x40 /* TSR and UART_THR Empty */
133 #define TFI 0x80 /* Transmission Finished Indicator */
134 
135 /* UART_MCR Masks */
136 #define XOFF 0x01 /* Transmitter Off */
137 #define MRTS 0x02 /* Manual Request To Send */
138 #define RFIT 0x04 /* Receive FIFO IRQ Threshold */
139 #define RFRT 0x08 /* Receive FIFO RTS Threshold */
140 #define LOOP_ENA 0x10 /* Loopback Mode Enable */
141 #define FCPOL 0x20 /* Flow Control Pin Polarity */
142 #define ARTS 0x40 /* Automatic Request To Send */
143 #define ACTS 0x80 /* Automatic Clear To Send */
144 
145 /* UART_MSR Masks */
146 #define SCTS 0x01 /* Sticky CTS */
147 #define CTS 0x10 /* Clear To Send */
148 #define RFCS 0x20 /* Receive FIFO Count Status */
149 
150 /* UART_GCTL Masks */
151 #define UCEN 0x01 /* Enable UARTx Clocks */
152 #define UMOD_IRDA 0x02 /* Enable IrDA Mode */
153 #define UMOD_MASK 0x02 /* Uart Mode Mask */
154 #define TPOLC 0x04 /* IrDA TX Polarity Change */
155 #define RPOLC 0x08 /* IrDA RX Polarity Change */
156 #define FPE 0x10 /* Force Parity Error On Transmit */
157 #define FFE 0x20 /* Force Framing Error On Transmit */
158 
159 #endif /* BFIN_UART_BF60X_STYLE */
160 
161 /* UART_IER Masks */
162 #define ERBFI 0x01 /* Enable Receive Buffer Full Interrupt */
163 #define ETBEI 0x02 /* Enable Transmit Buffer Empty Interrupt */
164 #define ELSI 0x04 /* Enable RX Status Interrupt */
165 #define EDSSI 0x08 /* Enable Modem Status Interrupt */
166 #define EDTPTI 0x10 /* Enable DMA Transmit PIRQ Interrupt */
167 #define ETFI 0x20 /* Enable Transmission Finished Interrupt */
168 #define ERFCI 0x40 /* Enable Receive FIFO Count Interrupt */
169 
170 #if defined(BFIN_UART_BF60X_STYLE)
171 # define OFFSET_REDIV 0x00 /* Version ID Register */
172 # define OFFSET_CTL 0x04 /* Control Register */
173 # define OFFSET_STAT 0x08 /* Status Register */
174 # define OFFSET_SCR 0x0C /* SCR Scratch Register */
175 # define OFFSET_CLK 0x10 /* Clock Rate Register */
176 # define OFFSET_IER 0x14 /* Interrupt Enable Register */
177 # define OFFSET_IER_SET 0x18 /* Set Interrupt Enable Register */
178 # define OFFSET_IER_CLEAR 0x1C /* Clear Interrupt Enable Register */
179 # define OFFSET_RBR 0x20 /* Receive Buffer register */
180 # define OFFSET_THR 0x24 /* Transmit Holding register */
181 #elif defined(BFIN_UART_BF54X_STYLE)
182 # define OFFSET_DLL 0x00 /* Divisor Latch (Low-Byte) */
183 # define OFFSET_DLH 0x04 /* Divisor Latch (High-Byte) */
184 # define OFFSET_GCTL 0x08 /* Global Control Register */
185 # define OFFSET_LCR 0x0C /* Line Control Register */
186 # define OFFSET_MCR 0x10 /* Modem Control Register */
187 # define OFFSET_LSR 0x14 /* Line Status Register */
188 # define OFFSET_MSR 0x18 /* Modem Status Register */
189 # define OFFSET_SCR 0x1C /* SCR Scratch Register */
190 # define OFFSET_IER_SET 0x20 /* Set Interrupt Enable Register */
191 # define OFFSET_IER_CLEAR 0x24 /* Clear Interrupt Enable Register */
192 # define OFFSET_THR 0x28 /* Transmit Holding register */
193 # define OFFSET_RBR 0x2C /* Receive Buffer register */
194 #else /* BF533 style */
195 # define OFFSET_THR 0x00 /* Transmit Holding register */
196 # define OFFSET_RBR 0x00 /* Receive Buffer register */
197 # define OFFSET_DLL 0x00 /* Divisor Latch (Low-Byte) */
198 # define OFFSET_DLH 0x04 /* Divisor Latch (High-Byte) */
199 # define OFFSET_IER 0x04 /* Interrupt Enable Register */
200 # define OFFSET_IIR 0x08 /* Interrupt Identification Register */
201 # define OFFSET_LCR 0x0C /* Line Control Register */
202 # define OFFSET_MCR 0x10 /* Modem Control Register */
203 # define OFFSET_LSR 0x14 /* Line Status Register */
204 # define OFFSET_MSR 0x18 /* Modem Status Register */
205 # define OFFSET_SCR 0x1C /* SCR Scratch Register */
206 # define OFFSET_GCTL 0x24 /* Global Control Register */
207 /* code should not need IIR, so force build error if they use it */
208 # undef OFFSET_IIR
209 #endif
210 
211 /*
212  * All Blackfin system MMRs are padded to 32bits even if the register
213  * itself is only 16bits. So use a helper macro to streamline this.
214  */
215 #define __BFP(m) u16 m; u16 __pad_##m
216 struct bfin_uart_regs {
217 #if defined(BFIN_UART_BF60X_STYLE)
218  u32 revid;
219  u32 ctl;
220  u32 stat;
221  u32 scr;
222  u32 clk;
223  u32 ier;
224  u32 ier_set;
225  u32 ier_clear;
226  u32 rbr;
227  u32 thr;
228  u32 taip;
229  u32 tsr;
230  u32 rsr;
231  u32 txdiv;
232  u32 rxdiv;
233 #elif defined(BFIN_UART_BF54X_STYLE)
234  __BFP(dll);
235  __BFP(dlh);
236  __BFP(gctl);
237  __BFP(lcr);
238  __BFP(mcr);
239  __BFP(lsr);
240  __BFP(msr);
241  __BFP(scr);
242  __BFP(ier_set);
243  __BFP(ier_clear);
244  __BFP(thr);
245  __BFP(rbr);
246 #else
247  union {
248  u16 dll;
249  u16 thr;
250  const u16 rbr;
251  };
252  const u16 __pad0;
253  union {
254  u16 dlh;
255  u16 ier;
256  };
257  const u16 __pad1;
258  const __BFP(iir);
259  __BFP(lcr);
260  __BFP(mcr);
261  __BFP(lsr);
262  __BFP(msr);
263  __BFP(scr);
264  const u32 __pad2;
265  __BFP(gctl);
266 #endif
267 };
268 #undef __BFP
269 
270 #define port_membase(uart) (((struct bfin_serial_port *)(uart))->port.membase)
271 
272 /*
273 #ifndef port_membase
274 # define port_membase(p) 0
275 #endif
276 */
277 #ifdef BFIN_UART_BF60X_STYLE
278 
279 #define UART_GET_CHAR(p) bfin_read32(port_membase(p) + OFFSET_RBR)
280 #define UART_GET_CLK(p) bfin_read32(port_membase(p) + OFFSET_CLK)
281 #define UART_GET_CTL(p) bfin_read32(port_membase(p) + OFFSET_CTL)
282 #define UART_GET_GCTL(p) UART_GET_CTL(p)
283 #define UART_GET_LCR(p) UART_GET_CTL(p)
284 #define UART_GET_MCR(p) UART_GET_CTL(p)
285 #if ANOMALY_16000030
286 #define UART_GET_STAT(p) \
287 ({ \
288  u32 __ret; \
289  unsigned long flags; \
290  flags = hard_local_irq_save(); \
291  __ret = bfin_read32(port_membase(p) + OFFSET_STAT); \
292  hard_local_irq_restore(flags); \
293  __ret; \
294 })
295 #else
296 #define UART_GET_STAT(p) bfin_read32(port_membase(p) + OFFSET_STAT)
297 #endif
298 #define UART_GET_MSR(p) UART_GET_STAT(p)
299 
300 #define UART_PUT_CHAR(p, v) bfin_write32(port_membase(p) + OFFSET_THR, v)
301 #define UART_PUT_CLK(p, v) bfin_write32(port_membase(p) + OFFSET_CLK, v)
302 #define UART_PUT_CTL(p, v) bfin_write32(port_membase(p) + OFFSET_CTL, v)
303 #define UART_PUT_GCTL(p, v) UART_PUT_CTL(p, v)
304 #define UART_PUT_LCR(p, v) UART_PUT_CTL(p, v)
305 #define UART_PUT_MCR(p, v) UART_PUT_CTL(p, v)
306 #define UART_PUT_STAT(p, v) bfin_write32(port_membase(p) + OFFSET_STAT, v)
307 
308 #define UART_CLEAR_IER(p, v) bfin_write32(port_membase(p) + OFFSET_IER_CLEAR, v)
309 #define UART_GET_IER(p) bfin_read32(port_membase(p) + OFFSET_IER)
310 #define UART_SET_IER(p, v) bfin_write32(port_membase(p) + OFFSET_IER_SET, v)
311 
312 #define UART_CLEAR_DLAB(p) /* MMRs not muxed on BF60x */
313 #define UART_SET_DLAB(p) /* MMRs not muxed on BF60x */
314 
315 #define UART_CLEAR_LSR(p) UART_PUT_STAT(p, -1)
316 #define UART_GET_LSR(p) UART_GET_STAT(p)
317 #define UART_PUT_LSR(p, v) UART_PUT_STAT(p, v)
318 
319 /* This handles hard CTS/RTS */
320 #define BFIN_UART_CTSRTS_HARD
321 #define UART_CLEAR_SCTS(p) UART_PUT_STAT(p, SCTS)
322 #define UART_GET_CTS(x) (UART_GET_MSR(x) & CTS)
323 #define UART_DISABLE_RTS(x) UART_PUT_MCR(x, UART_GET_MCR(x) & ~(ARTS | MRTS))
324 #define UART_ENABLE_RTS(x) UART_PUT_MCR(x, UART_GET_MCR(x) | MRTS | ARTS)
325 #define UART_ENABLE_INTS(x, v) UART_SET_IER(x, v)
326 #define UART_DISABLE_INTS(x) UART_CLEAR_IER(x, 0xF)
327 
328 #else /* BFIN_UART_BF60X_STYLE */
329 
330 #define UART_GET_CHAR(p) bfin_read16(port_membase(p) + OFFSET_RBR)
331 #define UART_GET_DLL(p) bfin_read16(port_membase(p) + OFFSET_DLL)
332 #define UART_GET_DLH(p) bfin_read16(port_membase(p) + OFFSET_DLH)
333 #define UART_GET_CLK(p) ((UART_GET_DLH(p) << 8) | UART_GET_DLL(p))
334 #define UART_GET_GCTL(p) bfin_read16(port_membase(p) + OFFSET_GCTL)
335 #define UART_GET_LCR(p) bfin_read16(port_membase(p) + OFFSET_LCR)
336 #define UART_GET_MCR(p) bfin_read16(port_membase(p) + OFFSET_MCR)
337 #define UART_GET_MSR(p) bfin_read16(port_membase(p) + OFFSET_MSR)
338 
339 #define UART_PUT_CHAR(p, v) bfin_write16(port_membase(p) + OFFSET_THR, v)
340 #define UART_PUT_DLL(p, v) bfin_write16(port_membase(p) + OFFSET_DLL, v)
341 #define UART_PUT_DLH(p, v) bfin_write16(port_membase(p) + OFFSET_DLH, v)
342 #define UART_PUT_CLK(p, v) do \
343 {\
344 UART_PUT_DLL(p, v & 0xFF); \
345 UART_PUT_DLH(p, (v >> 8) & 0xFF); } while (0);
346 
347 #define UART_PUT_GCTL(p, v) bfin_write16(port_membase(p) + OFFSET_GCTL, v)
348 #define UART_PUT_LCR(p, v) bfin_write16(port_membase(p) + OFFSET_LCR, v)
349 #define UART_PUT_MCR(p, v) bfin_write16(port_membase(p) + OFFSET_MCR, v)
350 
351 #ifdef BFIN_UART_BF54X_STYLE
352 
353 #define UART_CLEAR_IER(p, v) bfin_write16(port_membase(p) + OFFSET_IER_CLEAR, v)
354 #define UART_GET_IER(p) bfin_read16(port_membase(p) + OFFSET_IER_SET)
355 #define UART_SET_IER(p, v) bfin_write16(port_membase(p) + OFFSET_IER_SET, v)
356 
357 #define UART_CLEAR_DLAB(p) /* MMRs not muxed on BF54x */
358 #define UART_SET_DLAB(p) /* MMRs not muxed on BF54x */
359 
360 #define UART_CLEAR_LSR(p) bfin_write16(port_membase(p) + OFFSET_LSR, -1)
361 #define UART_GET_LSR(p) bfin_read16(port_membase(p) + OFFSET_LSR)
362 #define UART_PUT_LSR(p, v) bfin_write16(port_membase(p) + OFFSET_LSR, v)
363 
364 /* This handles hard CTS/RTS */
365 #define BFIN_UART_CTSRTS_HARD
366 #define UART_CLEAR_SCTS(p) bfin_write16((port_membase(p) + OFFSET_MSR), SCTS)
367 #define UART_GET_CTS(x) (UART_GET_MSR(x) & CTS)
368 #define UART_DISABLE_RTS(x) UART_PUT_MCR(x, UART_GET_MCR(x) & ~(ARTS | MRTS))
369 #define UART_ENABLE_RTS(x) UART_PUT_MCR(x, UART_GET_MCR(x) | MRTS | ARTS)
370 #define UART_ENABLE_INTS(x, v) UART_SET_IER(x, v)
371 #define UART_DISABLE_INTS(x) UART_CLEAR_IER(x, 0xF)
372 
373 #else /* BF533 style */
374 
375 #define UART_CLEAR_IER(p, v) UART_PUT_IER(p, UART_GET_IER(p) & ~(v))
376 #define UART_GET_IER(p) bfin_read16(port_membase(p) + OFFSET_IER)
377 #define UART_PUT_IER(p, v) bfin_write16(port_membase(p) + OFFSET_IER, v)
378 #define UART_SET_IER(p, v) UART_PUT_IER(p, UART_GET_IER(p) | (v))
379 
380 #define UART_CLEAR_DLAB(p) do { UART_PUT_LCR(p, UART_GET_LCR(p) & ~DLAB); SSYNC(); } while (0)
381 #define UART_SET_DLAB(p) do { UART_PUT_LCR(p, UART_GET_LCR(p) | DLAB); SSYNC(); } while (0)
382 
383 #define get_lsr_cache(uart) (((struct bfin_serial_port *)(uart))->lsr)
384 #define put_lsr_cache(uart, v) (((struct bfin_serial_port *)(uart))->lsr = (v))
385 
386 /*
387 #ifndef put_lsr_cache
388 # define put_lsr_cache(p, v)
389 #endif
390 #ifndef get_lsr_cache
391 # define get_lsr_cache(p) 0
392 #endif
393 */
394 
395 /* The hardware clears the LSR bits upon read, so we need to cache
396  * some of the more fun bits in software so they don't get lost
397  * when checking the LSR in other code paths (TX).
398  */
399 static inline void UART_CLEAR_LSR(void *p)
400 {
401  put_lsr_cache(p, 0);
402  bfin_write16(port_membase(p) + OFFSET_LSR, -1);
403 }
404 static inline unsigned int UART_GET_LSR(void *p)
405 {
406  unsigned int lsr = bfin_read16(port_membase(p) + OFFSET_LSR);
407  put_lsr_cache(p, get_lsr_cache(p) | (lsr & (BI|FE|PE|OE)));
408  return lsr | get_lsr_cache(p);
409 }
410 static inline void UART_PUT_LSR(void *p, uint16_t val)
411 {
412  put_lsr_cache(p, get_lsr_cache(p) & ~val);
413 }
414 
415 /* This handles soft CTS/RTS */
416 #define UART_GET_CTS(x) gpio_get_value((x)->cts_pin)
417 #define UART_DISABLE_RTS(x) gpio_set_value((x)->rts_pin, 1)
418 #define UART_ENABLE_RTS(x) gpio_set_value((x)->rts_pin, 0)
419 #define UART_ENABLE_INTS(x, v) UART_PUT_IER(x, v)
420 #define UART_DISABLE_INTS(x) UART_PUT_IER(x, 0)
421 
422 #endif /* BFIN_UART_BF54X_STYLE */
423 
424 #endif /* BFIN_UART_BF60X_STYLE */
425 
426 #ifndef BFIN_UART_TX_FIFO_SIZE
427 # define BFIN_UART_TX_FIFO_SIZE 2
428 #endif
429 
430 #endif /* __BFIN_ASM_SERIAL_H__ */
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