Commit | Line | Data |
---|---|---|
161e773c RW |
1 | /* |
2 | * Driver for CSR SiRFprimaII onboard UARTs. | |
3 | * | |
4 | * Copyright (c) 2011 Cambridge Silicon Radio Limited, a CSR plc group company. | |
5 | * | |
6 | * Licensed under GPLv2 or later. | |
7 | */ | |
8 | ||
9 | #include <linux/module.h> | |
10 | #include <linux/ioport.h> | |
11 | #include <linux/platform_device.h> | |
12 | #include <linux/init.h> | |
13 | #include <linux/sysrq.h> | |
14 | #include <linux/console.h> | |
15 | #include <linux/tty.h> | |
16 | #include <linux/tty_flip.h> | |
17 | #include <linux/serial_core.h> | |
18 | #include <linux/serial.h> | |
19 | #include <linux/clk.h> | |
20 | #include <linux/of.h> | |
21 | #include <linux/slab.h> | |
22 | #include <linux/io.h> | |
2eb5618d | 23 | #include <linux/of_gpio.h> |
8316d04c QL |
24 | #include <linux/dmaengine.h> |
25 | #include <linux/dma-direction.h> | |
26 | #include <linux/dma-mapping.h> | |
161e773c RW |
27 | #include <asm/irq.h> |
28 | #include <asm/mach/irq.h> | |
161e773c RW |
29 | |
30 | #include "sirfsoc_uart.h" | |
31 | ||
32 | static unsigned int | |
33 | sirfsoc_uart_pio_tx_chars(struct sirfsoc_uart_port *sirfport, int count); | |
34 | static unsigned int | |
35 | sirfsoc_uart_pio_rx_chars(struct uart_port *port, unsigned int max_rx_count); | |
36 | static struct uart_driver sirfsoc_uart_drv; | |
37 | ||
8316d04c | 38 | static void sirfsoc_uart_tx_dma_complete_callback(void *param); |
161e773c RW |
39 | static const struct sirfsoc_baudrate_to_regv baudrate_to_regv[] = { |
40 | {4000000, 2359296}, | |
41 | {3500000, 1310721}, | |
42 | {3000000, 1572865}, | |
43 | {2500000, 1245186}, | |
44 | {2000000, 1572866}, | |
45 | {1500000, 1245188}, | |
46 | {1152000, 1638404}, | |
47 | {1000000, 1572869}, | |
48 | {921600, 1114120}, | |
49 | {576000, 1245196}, | |
50 | {500000, 1245198}, | |
51 | {460800, 1572876}, | |
52 | {230400, 1310750}, | |
53 | {115200, 1310781}, | |
54 | {57600, 1310843}, | |
55 | {38400, 1114328}, | |
56 | {19200, 1114545}, | |
57 | {9600, 1114979}, | |
58 | }; | |
59 | ||
a6ffe896 | 60 | static struct sirfsoc_uart_port *sirf_ports[SIRFSOC_UART_NR]; |
161e773c RW |
61 | |
62 | static inline struct sirfsoc_uart_port *to_sirfport(struct uart_port *port) | |
63 | { | |
64 | return container_of(port, struct sirfsoc_uart_port, port); | |
65 | } | |
66 | ||
67 | static inline unsigned int sirfsoc_uart_tx_empty(struct uart_port *port) | |
68 | { | |
69 | unsigned long reg; | |
5df83111 QL |
70 | struct sirfsoc_uart_port *sirfport = to_sirfport(port); |
71 | struct sirfsoc_register *ureg = &sirfport->uart_reg->uart_reg; | |
72 | struct sirfsoc_fifo_status *ufifo_st = &sirfport->uart_reg->fifo_status; | |
73 | reg = rd_regl(port, ureg->sirfsoc_tx_fifo_status); | |
cb4595a2 | 74 | return (reg & ufifo_st->ff_empty(port)) ? TIOCSER_TEMT : 0; |
161e773c RW |
75 | } |
76 | ||
77 | static unsigned int sirfsoc_uart_get_mctrl(struct uart_port *port) | |
78 | { | |
79 | struct sirfsoc_uart_port *sirfport = to_sirfport(port); | |
5df83111 | 80 | struct sirfsoc_register *ureg = &sirfport->uart_reg->uart_reg; |
2eb5618d | 81 | if (!sirfport->hw_flow_ctrl || !sirfport->ms_enabled) |
161e773c | 82 | goto cts_asserted; |
2eb5618d | 83 | if (sirfport->uart_reg->uart_type == SIRF_REAL_UART) { |
5df83111 QL |
84 | if (!(rd_regl(port, ureg->sirfsoc_afc_ctrl) & |
85 | SIRFUART_AFC_CTS_STATUS)) | |
161e773c RW |
86 | goto cts_asserted; |
87 | else | |
88 | goto cts_deasserted; | |
2eb5618d QL |
89 | } else { |
90 | if (!gpio_get_value(sirfport->cts_gpio)) | |
91 | goto cts_asserted; | |
92 | else | |
93 | goto cts_deasserted; | |
161e773c RW |
94 | } |
95 | cts_deasserted: | |
96 | return TIOCM_CAR | TIOCM_DSR; | |
97 | cts_asserted: | |
98 | return TIOCM_CAR | TIOCM_DSR | TIOCM_CTS; | |
99 | } | |
100 | ||
101 | static void sirfsoc_uart_set_mctrl(struct uart_port *port, unsigned int mctrl) | |
102 | { | |
103 | struct sirfsoc_uart_port *sirfport = to_sirfport(port); | |
5df83111 | 104 | struct sirfsoc_register *ureg = &sirfport->uart_reg->uart_reg; |
161e773c RW |
105 | unsigned int assert = mctrl & TIOCM_RTS; |
106 | unsigned int val = assert ? SIRFUART_AFC_CTRL_RX_THD : 0x0; | |
107 | unsigned int current_val; | |
2eb5618d | 108 | |
7f60f2fe QL |
109 | if (mctrl & TIOCM_LOOP) { |
110 | if (sirfport->uart_reg->uart_type == SIRF_REAL_UART) | |
111 | wr_regl(port, ureg->sirfsoc_line_ctrl, | |
112 | rd_regl(port, ureg->sirfsoc_line_ctrl) | | |
113 | SIRFUART_LOOP_BACK); | |
114 | else | |
115 | wr_regl(port, ureg->sirfsoc_mode1, | |
116 | rd_regl(port, ureg->sirfsoc_mode1) | | |
117 | SIRFSOC_USP_LOOP_BACK_CTRL); | |
118 | } else { | |
119 | if (sirfport->uart_reg->uart_type == SIRF_REAL_UART) | |
120 | wr_regl(port, ureg->sirfsoc_line_ctrl, | |
121 | rd_regl(port, ureg->sirfsoc_line_ctrl) & | |
122 | ~SIRFUART_LOOP_BACK); | |
123 | else | |
124 | wr_regl(port, ureg->sirfsoc_mode1, | |
125 | rd_regl(port, ureg->sirfsoc_mode1) & | |
126 | ~SIRFSOC_USP_LOOP_BACK_CTRL); | |
127 | } | |
128 | ||
2eb5618d QL |
129 | if (!sirfport->hw_flow_ctrl || !sirfport->ms_enabled) |
130 | return; | |
131 | if (sirfport->uart_reg->uart_type == SIRF_REAL_UART) { | |
5df83111 | 132 | current_val = rd_regl(port, ureg->sirfsoc_afc_ctrl) & ~0xFF; |
161e773c | 133 | val |= current_val; |
5df83111 | 134 | wr_regl(port, ureg->sirfsoc_afc_ctrl, val); |
2eb5618d QL |
135 | } else { |
136 | if (!val) | |
137 | gpio_set_value(sirfport->rts_gpio, 1); | |
138 | else | |
139 | gpio_set_value(sirfport->rts_gpio, 0); | |
161e773c RW |
140 | } |
141 | } | |
142 | ||
143 | static void sirfsoc_uart_stop_tx(struct uart_port *port) | |
144 | { | |
909102db | 145 | struct sirfsoc_uart_port *sirfport = to_sirfport(port); |
5df83111 QL |
146 | struct sirfsoc_register *ureg = &sirfport->uart_reg->uart_reg; |
147 | struct sirfsoc_int_en *uint_en = &sirfport->uart_reg->uart_int_en; | |
909102db | 148 | |
9be16b38 | 149 | if (sirfport->tx_dma_chan) { |
8316d04c QL |
150 | if (sirfport->tx_dma_state == TX_DMA_RUNNING) { |
151 | dmaengine_pause(sirfport->tx_dma_chan); | |
152 | sirfport->tx_dma_state = TX_DMA_PAUSE; | |
153 | } else { | |
057badd6 | 154 | if (!sirfport->is_atlas7) |
8316d04c QL |
155 | wr_regl(port, ureg->sirfsoc_int_en_reg, |
156 | rd_regl(port, ureg->sirfsoc_int_en_reg) & | |
157 | ~uint_en->sirfsoc_txfifo_empty_en); | |
158 | else | |
c1b7ac6f | 159 | wr_regl(port, ureg->sirfsoc_int_en_clr_reg, |
8316d04c QL |
160 | uint_en->sirfsoc_txfifo_empty_en); |
161 | } | |
162 | } else { | |
c1b7ac6f QL |
163 | if (sirfport->uart_reg->uart_type == SIRF_USP_UART) |
164 | wr_regl(port, ureg->sirfsoc_tx_rx_en, rd_regl(port, | |
165 | ureg->sirfsoc_tx_rx_en) & ~SIRFUART_TX_EN); | |
057badd6 | 166 | if (!sirfport->is_atlas7) |
8316d04c QL |
167 | wr_regl(port, ureg->sirfsoc_int_en_reg, |
168 | rd_regl(port, ureg->sirfsoc_int_en_reg) & | |
169 | ~uint_en->sirfsoc_txfifo_empty_en); | |
170 | else | |
c1b7ac6f | 171 | wr_regl(port, ureg->sirfsoc_int_en_clr_reg, |
8316d04c QL |
172 | uint_en->sirfsoc_txfifo_empty_en); |
173 | } | |
174 | } | |
175 | ||
176 | static void sirfsoc_uart_tx_with_dma(struct sirfsoc_uart_port *sirfport) | |
177 | { | |
178 | struct uart_port *port = &sirfport->port; | |
179 | struct sirfsoc_register *ureg = &sirfport->uart_reg->uart_reg; | |
180 | struct sirfsoc_int_en *uint_en = &sirfport->uart_reg->uart_int_en; | |
181 | struct circ_buf *xmit = &port->state->xmit; | |
182 | unsigned long tran_size; | |
183 | unsigned long tran_start; | |
184 | unsigned long pio_tx_size; | |
185 | ||
186 | tran_size = CIRC_CNT_TO_END(xmit->head, xmit->tail, UART_XMIT_SIZE); | |
187 | tran_start = (unsigned long)(xmit->buf + xmit->tail); | |
188 | if (uart_circ_empty(xmit) || uart_tx_stopped(port) || | |
189 | !tran_size) | |
190 | return; | |
191 | if (sirfport->tx_dma_state == TX_DMA_PAUSE) { | |
192 | dmaengine_resume(sirfport->tx_dma_chan); | |
193 | return; | |
194 | } | |
195 | if (sirfport->tx_dma_state == TX_DMA_RUNNING) | |
196 | return; | |
057badd6 | 197 | if (!sirfport->is_atlas7) |
5df83111 | 198 | wr_regl(port, ureg->sirfsoc_int_en_reg, |
8316d04c QL |
199 | rd_regl(port, ureg->sirfsoc_int_en_reg)& |
200 | ~(uint_en->sirfsoc_txfifo_empty_en)); | |
201 | else | |
c1b7ac6f | 202 | wr_regl(port, ureg->sirfsoc_int_en_clr_reg, |
5df83111 | 203 | uint_en->sirfsoc_txfifo_empty_en); |
8316d04c QL |
204 | /* |
205 | * DMA requires buffer address and buffer length are both aligned with | |
206 | * 4 bytes, so we use PIO for | |
207 | * 1. if address is not aligned with 4bytes, use PIO for the first 1~3 | |
208 | * bytes, and move to DMA for the left part aligned with 4bytes | |
209 | * 2. if buffer length is not aligned with 4bytes, use DMA for aligned | |
210 | * part first, move to PIO for the left 1~3 bytes | |
211 | */ | |
212 | if (tran_size < 4 || BYTES_TO_ALIGN(tran_start)) { | |
213 | wr_regl(port, ureg->sirfsoc_tx_fifo_op, SIRFUART_FIFO_STOP); | |
214 | wr_regl(port, ureg->sirfsoc_tx_dma_io_ctrl, | |
215 | rd_regl(port, ureg->sirfsoc_tx_dma_io_ctrl)| | |
216 | SIRFUART_IO_MODE); | |
217 | if (BYTES_TO_ALIGN(tran_start)) { | |
218 | pio_tx_size = sirfsoc_uart_pio_tx_chars(sirfport, | |
219 | BYTES_TO_ALIGN(tran_start)); | |
220 | tran_size -= pio_tx_size; | |
221 | } | |
222 | if (tran_size < 4) | |
223 | sirfsoc_uart_pio_tx_chars(sirfport, tran_size); | |
057badd6 | 224 | if (!sirfport->is_atlas7) |
8316d04c QL |
225 | wr_regl(port, ureg->sirfsoc_int_en_reg, |
226 | rd_regl(port, ureg->sirfsoc_int_en_reg)| | |
227 | uint_en->sirfsoc_txfifo_empty_en); | |
228 | else | |
229 | wr_regl(port, ureg->sirfsoc_int_en_reg, | |
230 | uint_en->sirfsoc_txfifo_empty_en); | |
231 | wr_regl(port, ureg->sirfsoc_tx_fifo_op, SIRFUART_FIFO_START); | |
232 | } else { | |
233 | /* tx transfer mode switch into dma mode */ | |
234 | wr_regl(port, ureg->sirfsoc_tx_fifo_op, SIRFUART_FIFO_STOP); | |
235 | wr_regl(port, ureg->sirfsoc_tx_dma_io_ctrl, | |
236 | rd_regl(port, ureg->sirfsoc_tx_dma_io_ctrl)& | |
237 | ~SIRFUART_IO_MODE); | |
238 | wr_regl(port, ureg->sirfsoc_tx_fifo_op, SIRFUART_FIFO_START); | |
239 | tran_size &= ~(0x3); | |
240 | ||
241 | sirfport->tx_dma_addr = dma_map_single(port->dev, | |
242 | xmit->buf + xmit->tail, | |
243 | tran_size, DMA_TO_DEVICE); | |
244 | sirfport->tx_dma_desc = dmaengine_prep_slave_single( | |
245 | sirfport->tx_dma_chan, sirfport->tx_dma_addr, | |
246 | tran_size, DMA_MEM_TO_DEV, DMA_PREP_INTERRUPT); | |
247 | if (!sirfport->tx_dma_desc) { | |
248 | dev_err(port->dev, "DMA prep slave single fail\n"); | |
249 | return; | |
250 | } | |
251 | sirfport->tx_dma_desc->callback = | |
252 | sirfsoc_uart_tx_dma_complete_callback; | |
253 | sirfport->tx_dma_desc->callback_param = (void *)sirfport; | |
254 | sirfport->transfer_size = tran_size; | |
255 | ||
256 | dmaengine_submit(sirfport->tx_dma_desc); | |
257 | dma_async_issue_pending(sirfport->tx_dma_chan); | |
258 | sirfport->tx_dma_state = TX_DMA_RUNNING; | |
259 | } | |
161e773c RW |
260 | } |
261 | ||
ada1f443 | 262 | static void sirfsoc_uart_start_tx(struct uart_port *port) |
161e773c RW |
263 | { |
264 | struct sirfsoc_uart_port *sirfport = to_sirfport(port); | |
5df83111 QL |
265 | struct sirfsoc_register *ureg = &sirfport->uart_reg->uart_reg; |
266 | struct sirfsoc_int_en *uint_en = &sirfport->uart_reg->uart_int_en; | |
9be16b38 | 267 | if (sirfport->tx_dma_chan) |
8316d04c QL |
268 | sirfsoc_uart_tx_with_dma(sirfport); |
269 | else { | |
c1b7ac6f QL |
270 | if (sirfport->uart_reg->uart_type == SIRF_USP_UART) |
271 | wr_regl(port, ureg->sirfsoc_tx_rx_en, rd_regl(port, | |
272 | ureg->sirfsoc_tx_rx_en) | SIRFUART_TX_EN); | |
326707ed | 273 | wr_regl(port, ureg->sirfsoc_tx_fifo_op, SIRFUART_FIFO_STOP); |
cb4595a2 | 274 | sirfsoc_uart_pio_tx_chars(sirfport, port->fifosize); |
8316d04c | 275 | wr_regl(port, ureg->sirfsoc_tx_fifo_op, SIRFUART_FIFO_START); |
057badd6 | 276 | if (!sirfport->is_atlas7) |
8316d04c QL |
277 | wr_regl(port, ureg->sirfsoc_int_en_reg, |
278 | rd_regl(port, ureg->sirfsoc_int_en_reg)| | |
279 | uint_en->sirfsoc_txfifo_empty_en); | |
280 | else | |
281 | wr_regl(port, ureg->sirfsoc_int_en_reg, | |
282 | uint_en->sirfsoc_txfifo_empty_en); | |
283 | } | |
161e773c RW |
284 | } |
285 | ||
286 | static void sirfsoc_uart_stop_rx(struct uart_port *port) | |
287 | { | |
909102db | 288 | struct sirfsoc_uart_port *sirfport = to_sirfport(port); |
5df83111 QL |
289 | struct sirfsoc_register *ureg = &sirfport->uart_reg->uart_reg; |
290 | struct sirfsoc_int_en *uint_en = &sirfport->uart_reg->uart_int_en; | |
8316d04c | 291 | |
5df83111 | 292 | wr_regl(port, ureg->sirfsoc_rx_fifo_op, 0); |
9be16b38 | 293 | if (sirfport->rx_dma_chan) { |
057badd6 | 294 | if (!sirfport->is_atlas7) |
8316d04c QL |
295 | wr_regl(port, ureg->sirfsoc_int_en_reg, |
296 | rd_regl(port, ureg->sirfsoc_int_en_reg) & | |
c1b7ac6f QL |
297 | ~(SIRFUART_RX_DMA_INT_EN(uint_en, |
298 | sirfport->uart_reg->uart_type) | | |
8316d04c QL |
299 | uint_en->sirfsoc_rx_done_en)); |
300 | else | |
c1b7ac6f QL |
301 | wr_regl(port, ureg->sirfsoc_int_en_clr_reg, |
302 | SIRFUART_RX_DMA_INT_EN(uint_en, | |
303 | sirfport->uart_reg->uart_type)| | |
304 | uint_en->sirfsoc_rx_done_en); | |
8316d04c QL |
305 | dmaengine_terminate_all(sirfport->rx_dma_chan); |
306 | } else { | |
057badd6 | 307 | if (!sirfport->is_atlas7) |
8316d04c QL |
308 | wr_regl(port, ureg->sirfsoc_int_en_reg, |
309 | rd_regl(port, ureg->sirfsoc_int_en_reg)& | |
c1b7ac6f QL |
310 | ~(SIRFUART_RX_IO_INT_EN(uint_en, |
311 | sirfport->uart_reg->uart_type))); | |
8316d04c | 312 | else |
c1b7ac6f QL |
313 | wr_regl(port, ureg->sirfsoc_int_en_clr_reg, |
314 | SIRFUART_RX_IO_INT_EN(uint_en, | |
315 | sirfport->uart_reg->uart_type)); | |
8316d04c | 316 | } |
161e773c RW |
317 | } |
318 | ||
319 | static void sirfsoc_uart_disable_ms(struct uart_port *port) | |
320 | { | |
321 | struct sirfsoc_uart_port *sirfport = to_sirfport(port); | |
5df83111 QL |
322 | struct sirfsoc_register *ureg = &sirfport->uart_reg->uart_reg; |
323 | struct sirfsoc_int_en *uint_en = &sirfport->uart_reg->uart_int_en; | |
909102db | 324 | |
161e773c RW |
325 | if (!sirfport->hw_flow_ctrl) |
326 | return; | |
2eb5618d QL |
327 | sirfport->ms_enabled = false; |
328 | if (sirfport->uart_reg->uart_type == SIRF_REAL_UART) { | |
329 | wr_regl(port, ureg->sirfsoc_afc_ctrl, | |
330 | rd_regl(port, ureg->sirfsoc_afc_ctrl) & ~0x3FF); | |
057badd6 | 331 | if (!sirfport->is_atlas7) |
2eb5618d QL |
332 | wr_regl(port, ureg->sirfsoc_int_en_reg, |
333 | rd_regl(port, ureg->sirfsoc_int_en_reg)& | |
334 | ~uint_en->sirfsoc_cts_en); | |
335 | else | |
c1b7ac6f | 336 | wr_regl(port, ureg->sirfsoc_int_en_clr_reg, |
2eb5618d | 337 | uint_en->sirfsoc_cts_en); |
5df83111 | 338 | } else |
2eb5618d QL |
339 | disable_irq(gpio_to_irq(sirfport->cts_gpio)); |
340 | } | |
341 | ||
342 | static irqreturn_t sirfsoc_uart_usp_cts_handler(int irq, void *dev_id) | |
343 | { | |
344 | struct sirfsoc_uart_port *sirfport = (struct sirfsoc_uart_port *)dev_id; | |
345 | struct uart_port *port = &sirfport->port; | |
07d410e0 | 346 | spin_lock(&port->lock); |
2eb5618d QL |
347 | if (gpio_is_valid(sirfport->cts_gpio) && sirfport->ms_enabled) |
348 | uart_handle_cts_change(port, | |
349 | !gpio_get_value(sirfport->cts_gpio)); | |
07d410e0 | 350 | spin_unlock(&port->lock); |
2eb5618d | 351 | return IRQ_HANDLED; |
161e773c RW |
352 | } |
353 | ||
354 | static void sirfsoc_uart_enable_ms(struct uart_port *port) | |
355 | { | |
356 | struct sirfsoc_uart_port *sirfport = to_sirfport(port); | |
5df83111 QL |
357 | struct sirfsoc_register *ureg = &sirfport->uart_reg->uart_reg; |
358 | struct sirfsoc_int_en *uint_en = &sirfport->uart_reg->uart_int_en; | |
909102db | 359 | |
161e773c RW |
360 | if (!sirfport->hw_flow_ctrl) |
361 | return; | |
2eb5618d QL |
362 | sirfport->ms_enabled = true; |
363 | if (sirfport->uart_reg->uart_type == SIRF_REAL_UART) { | |
364 | wr_regl(port, ureg->sirfsoc_afc_ctrl, | |
365 | rd_regl(port, ureg->sirfsoc_afc_ctrl) | | |
eab192ae QL |
366 | SIRFUART_AFC_TX_EN | SIRFUART_AFC_RX_EN | |
367 | SIRFUART_AFC_CTRL_RX_THD); | |
057badd6 | 368 | if (!sirfport->is_atlas7) |
2eb5618d QL |
369 | wr_regl(port, ureg->sirfsoc_int_en_reg, |
370 | rd_regl(port, ureg->sirfsoc_int_en_reg) | |
371 | | uint_en->sirfsoc_cts_en); | |
372 | else | |
373 | wr_regl(port, ureg->sirfsoc_int_en_reg, | |
374 | uint_en->sirfsoc_cts_en); | |
5df83111 | 375 | } else |
2eb5618d | 376 | enable_irq(gpio_to_irq(sirfport->cts_gpio)); |
161e773c RW |
377 | } |
378 | ||
379 | static void sirfsoc_uart_break_ctl(struct uart_port *port, int break_state) | |
380 | { | |
5df83111 QL |
381 | struct sirfsoc_uart_port *sirfport = to_sirfport(port); |
382 | struct sirfsoc_register *ureg = &sirfport->uart_reg->uart_reg; | |
383 | if (sirfport->uart_reg->uart_type == SIRF_REAL_UART) { | |
384 | unsigned long ulcon = rd_regl(port, ureg->sirfsoc_line_ctrl); | |
385 | if (break_state) | |
386 | ulcon |= SIRFUART_SET_BREAK; | |
387 | else | |
388 | ulcon &= ~SIRFUART_SET_BREAK; | |
389 | wr_regl(port, ureg->sirfsoc_line_ctrl, ulcon); | |
390 | } | |
161e773c RW |
391 | } |
392 | ||
393 | static unsigned int | |
394 | sirfsoc_uart_pio_rx_chars(struct uart_port *port, unsigned int max_rx_count) | |
395 | { | |
5df83111 QL |
396 | struct sirfsoc_uart_port *sirfport = to_sirfport(port); |
397 | struct sirfsoc_register *ureg = &sirfport->uart_reg->uart_reg; | |
398 | struct sirfsoc_fifo_status *ufifo_st = &sirfport->uart_reg->fifo_status; | |
161e773c | 399 | unsigned int ch, rx_count = 0; |
5df83111 QL |
400 | struct tty_struct *tty; |
401 | tty = tty_port_tty_get(&port->state->port); | |
402 | if (!tty) | |
403 | return -ENODEV; | |
404 | while (!(rd_regl(port, ureg->sirfsoc_rx_fifo_status) & | |
cb4595a2 | 405 | ufifo_st->ff_empty(port))) { |
5df83111 QL |
406 | ch = rd_regl(port, ureg->sirfsoc_rx_fifo_data) | |
407 | SIRFUART_DUMMY_READ; | |
161e773c RW |
408 | if (unlikely(uart_handle_sysrq_char(port, ch))) |
409 | continue; | |
410 | uart_insert_char(port, 0, 0, ch, TTY_NORMAL); | |
411 | rx_count++; | |
412 | if (rx_count >= max_rx_count) | |
413 | break; | |
414 | } | |
415 | ||
8316d04c | 416 | sirfport->rx_io_count += rx_count; |
161e773c | 417 | port->icount.rx += rx_count; |
8b9ade9f | 418 | |
161e773c RW |
419 | return rx_count; |
420 | } | |
421 | ||
422 | static unsigned int | |
423 | sirfsoc_uart_pio_tx_chars(struct sirfsoc_uart_port *sirfport, int count) | |
424 | { | |
425 | struct uart_port *port = &sirfport->port; | |
5df83111 QL |
426 | struct sirfsoc_register *ureg = &sirfport->uart_reg->uart_reg; |
427 | struct sirfsoc_fifo_status *ufifo_st = &sirfport->uart_reg->fifo_status; | |
161e773c RW |
428 | struct circ_buf *xmit = &port->state->xmit; |
429 | unsigned int num_tx = 0; | |
430 | while (!uart_circ_empty(xmit) && | |
5df83111 | 431 | !(rd_regl(port, ureg->sirfsoc_tx_fifo_status) & |
cb4595a2 | 432 | ufifo_st->ff_full(port)) && |
161e773c | 433 | count--) { |
5df83111 QL |
434 | wr_regl(port, ureg->sirfsoc_tx_fifo_data, |
435 | xmit->buf[xmit->tail]); | |
161e773c RW |
436 | xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1); |
437 | port->icount.tx++; | |
438 | num_tx++; | |
439 | } | |
440 | if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) | |
441 | uart_write_wakeup(port); | |
442 | return num_tx; | |
443 | } | |
444 | ||
8316d04c QL |
445 | static void sirfsoc_uart_tx_dma_complete_callback(void *param) |
446 | { | |
447 | struct sirfsoc_uart_port *sirfport = (struct sirfsoc_uart_port *)param; | |
448 | struct uart_port *port = &sirfport->port; | |
449 | struct circ_buf *xmit = &port->state->xmit; | |
450 | unsigned long flags; | |
451 | ||
07d410e0 | 452 | spin_lock_irqsave(&port->lock, flags); |
8316d04c QL |
453 | xmit->tail = (xmit->tail + sirfport->transfer_size) & |
454 | (UART_XMIT_SIZE - 1); | |
455 | port->icount.tx += sirfport->transfer_size; | |
456 | if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) | |
457 | uart_write_wakeup(port); | |
458 | if (sirfport->tx_dma_addr) | |
459 | dma_unmap_single(port->dev, sirfport->tx_dma_addr, | |
460 | sirfport->transfer_size, DMA_TO_DEVICE); | |
8316d04c QL |
461 | sirfport->tx_dma_state = TX_DMA_IDLE; |
462 | sirfsoc_uart_tx_with_dma(sirfport); | |
07d410e0 | 463 | spin_unlock_irqrestore(&port->lock, flags); |
8316d04c QL |
464 | } |
465 | ||
161e773c RW |
466 | static irqreturn_t sirfsoc_uart_isr(int irq, void *dev_id) |
467 | { | |
468 | unsigned long intr_status; | |
469 | unsigned long cts_status; | |
470 | unsigned long flag = TTY_NORMAL; | |
471 | struct sirfsoc_uart_port *sirfport = (struct sirfsoc_uart_port *)dev_id; | |
472 | struct uart_port *port = &sirfport->port; | |
5df83111 QL |
473 | struct sirfsoc_register *ureg = &sirfport->uart_reg->uart_reg; |
474 | struct sirfsoc_fifo_status *ufifo_st = &sirfport->uart_reg->fifo_status; | |
475 | struct sirfsoc_int_status *uint_st = &sirfport->uart_reg->uart_int_st; | |
476 | struct sirfsoc_int_en *uint_en = &sirfport->uart_reg->uart_int_en; | |
161e773c RW |
477 | struct uart_state *state = port->state; |
478 | struct circ_buf *xmit = &port->state->xmit; | |
5425e03f | 479 | spin_lock(&port->lock); |
5df83111 QL |
480 | intr_status = rd_regl(port, ureg->sirfsoc_int_st_reg); |
481 | wr_regl(port, ureg->sirfsoc_int_st_reg, intr_status); | |
8316d04c | 482 | intr_status &= rd_regl(port, ureg->sirfsoc_int_en_reg); |
c1b7ac6f QL |
483 | if (unlikely(intr_status & (SIRFUART_ERR_INT_STAT(uint_st, |
484 | sirfport->uart_reg->uart_type)))) { | |
5df83111 QL |
485 | if (intr_status & uint_st->sirfsoc_rxd_brk) { |
486 | port->icount.brk++; | |
161e773c RW |
487 | if (uart_handle_break(port)) |
488 | goto recv_char; | |
161e773c | 489 | } |
d9e8e976 | 490 | if (intr_status & uint_st->sirfsoc_rx_oflow) { |
161e773c | 491 | port->icount.overrun++; |
d9e8e976 QL |
492 | flag = TTY_OVERRUN; |
493 | } | |
5df83111 | 494 | if (intr_status & uint_st->sirfsoc_frm_err) { |
161e773c RW |
495 | port->icount.frame++; |
496 | flag = TTY_FRAME; | |
497 | } | |
d9e8e976 QL |
498 | if (intr_status & uint_st->sirfsoc_parity_err) { |
499 | port->icount.parity++; | |
161e773c | 500 | flag = TTY_PARITY; |
d9e8e976 | 501 | } |
5df83111 QL |
502 | wr_regl(port, ureg->sirfsoc_rx_fifo_op, SIRFUART_FIFO_RESET); |
503 | wr_regl(port, ureg->sirfsoc_rx_fifo_op, 0); | |
504 | wr_regl(port, ureg->sirfsoc_rx_fifo_op, SIRFUART_FIFO_START); | |
161e773c RW |
505 | intr_status &= port->read_status_mask; |
506 | uart_insert_char(port, intr_status, | |
5df83111 | 507 | uint_en->sirfsoc_rx_oflow_en, 0, flag); |
161e773c RW |
508 | } |
509 | recv_char: | |
5df83111 | 510 | if ((sirfport->uart_reg->uart_type == SIRF_REAL_UART) && |
8316d04c QL |
511 | (intr_status & SIRFUART_CTS_INT_ST(uint_st)) && |
512 | !sirfport->tx_dma_state) { | |
5df83111 QL |
513 | cts_status = rd_regl(port, ureg->sirfsoc_afc_ctrl) & |
514 | SIRFUART_AFC_CTS_STATUS; | |
515 | if (cts_status != 0) | |
516 | cts_status = 0; | |
517 | else | |
518 | cts_status = 1; | |
519 | uart_handle_cts_change(port, cts_status); | |
520 | wake_up_interruptible(&state->port.delta_msr_wait); | |
161e773c | 521 | } |
0f17e3b4 QL |
522 | if (!sirfport->rx_dma_chan && |
523 | (intr_status & SIRFUART_RX_IO_INT_ST(uint_st))) { | |
c1b7ac6f QL |
524 | /* |
525 | * chip will trigger continuous RX_TIMEOUT interrupt | |
526 | * in RXFIFO empty and not trigger if RXFIFO recevice | |
527 | * data in limit time, original method use RX_TIMEOUT | |
528 | * will trigger lots of useless interrupt in RXFIFO | |
529 | * empty.RXFIFO received one byte will trigger RX_DONE | |
530 | * interrupt.use RX_DONE to wait for data received | |
531 | * into RXFIFO, use RX_THD/RX_FULL for lots data receive | |
532 | * and use RX_TIMEOUT for the last left data. | |
533 | */ | |
534 | if (intr_status & uint_st->sirfsoc_rx_done) { | |
535 | if (!sirfport->is_atlas7) { | |
536 | wr_regl(port, ureg->sirfsoc_int_en_reg, | |
537 | rd_regl(port, ureg->sirfsoc_int_en_reg) | |
538 | & ~(uint_en->sirfsoc_rx_done_en)); | |
539 | wr_regl(port, ureg->sirfsoc_int_en_reg, | |
540 | rd_regl(port, ureg->sirfsoc_int_en_reg) | |
541 | | (uint_en->sirfsoc_rx_timeout_en)); | |
542 | } else { | |
543 | wr_regl(port, ureg->sirfsoc_int_en_clr_reg, | |
544 | uint_en->sirfsoc_rx_done_en); | |
545 | wr_regl(port, ureg->sirfsoc_int_en_reg, | |
546 | uint_en->sirfsoc_rx_timeout_en); | |
547 | } | |
548 | } else { | |
549 | if (intr_status & uint_st->sirfsoc_rx_timeout) { | |
550 | if (!sirfport->is_atlas7) { | |
551 | wr_regl(port, ureg->sirfsoc_int_en_reg, | |
552 | rd_regl(port, ureg->sirfsoc_int_en_reg) | |
553 | & ~(uint_en->sirfsoc_rx_timeout_en)); | |
554 | wr_regl(port, ureg->sirfsoc_int_en_reg, | |
555 | rd_regl(port, ureg->sirfsoc_int_en_reg) | |
556 | | (uint_en->sirfsoc_rx_done_en)); | |
557 | } else { | |
558 | wr_regl(port, | |
559 | ureg->sirfsoc_int_en_clr_reg, | |
560 | uint_en->sirfsoc_rx_timeout_en); | |
561 | wr_regl(port, ureg->sirfsoc_int_en_reg, | |
562 | uint_en->sirfsoc_rx_done_en); | |
563 | } | |
564 | } | |
cb4595a2 | 565 | sirfsoc_uart_pio_rx_chars(port, port->fifosize); |
c1b7ac6f | 566 | } |
8316d04c | 567 | } |
07d410e0 QL |
568 | spin_unlock(&port->lock); |
569 | tty_flip_buffer_push(&state->port); | |
570 | spin_lock(&port->lock); | |
5df83111 | 571 | if (intr_status & uint_st->sirfsoc_txfifo_empty) { |
9be16b38 | 572 | if (sirfport->tx_dma_chan) |
8316d04c QL |
573 | sirfsoc_uart_tx_with_dma(sirfport); |
574 | else { | |
575 | if (uart_circ_empty(xmit) || uart_tx_stopped(port)) { | |
576 | spin_unlock(&port->lock); | |
577 | return IRQ_HANDLED; | |
578 | } else { | |
579 | sirfsoc_uart_pio_tx_chars(sirfport, | |
cb4595a2 | 580 | port->fifosize); |
8316d04c | 581 | if ((uart_circ_empty(xmit)) && |
5df83111 | 582 | (rd_regl(port, ureg->sirfsoc_tx_fifo_status) & |
cb4595a2 | 583 | ufifo_st->ff_empty(port))) |
8316d04c QL |
584 | sirfsoc_uart_stop_tx(port); |
585 | } | |
161e773c RW |
586 | } |
587 | } | |
5425e03f | 588 | spin_unlock(&port->lock); |
07d410e0 | 589 | |
161e773c RW |
590 | return IRQ_HANDLED; |
591 | } | |
592 | ||
8316d04c QL |
593 | static void sirfsoc_uart_rx_dma_complete_callback(void *param) |
594 | { | |
8316d04c QL |
595 | } |
596 | ||
597 | /* submit rx dma task into dmaengine */ | |
598 | static void sirfsoc_uart_start_next_rx_dma(struct uart_port *port) | |
161e773c | 599 | { |
909102db | 600 | struct sirfsoc_uart_port *sirfport = to_sirfport(port); |
5df83111 QL |
601 | struct sirfsoc_register *ureg = &sirfport->uart_reg->uart_reg; |
602 | struct sirfsoc_int_en *uint_en = &sirfport->uart_reg->uart_int_en; | |
8316d04c QL |
603 | sirfport->rx_io_count = 0; |
604 | wr_regl(port, ureg->sirfsoc_rx_dma_io_ctrl, | |
605 | rd_regl(port, ureg->sirfsoc_rx_dma_io_ctrl) & | |
606 | ~SIRFUART_IO_MODE); | |
0f17e3b4 QL |
607 | sirfport->rx_dma_items.xmit.tail = |
608 | sirfport->rx_dma_items.xmit.head = 0; | |
609 | sirfport->rx_dma_items.desc = | |
610 | dmaengine_prep_dma_cyclic(sirfport->rx_dma_chan, | |
611 | sirfport->rx_dma_items.dma_addr, SIRFSOC_RX_DMA_BUF_SIZE, | |
612 | SIRFSOC_RX_DMA_BUF_SIZE / 2, | |
613 | DMA_DEV_TO_MEM, DMA_PREP_INTERRUPT); | |
614 | if (IS_ERR_OR_NULL(sirfport->rx_dma_items.desc)) { | |
615 | dev_err(port->dev, "DMA slave single fail\n"); | |
616 | return; | |
617 | } | |
618 | sirfport->rx_dma_items.desc->callback = | |
619 | sirfsoc_uart_rx_dma_complete_callback; | |
620 | sirfport->rx_dma_items.desc->callback_param = sirfport; | |
621 | sirfport->rx_dma_items.cookie = | |
622 | dmaengine_submit(sirfport->rx_dma_items.desc); | |
623 | dma_async_issue_pending(sirfport->rx_dma_chan); | |
057badd6 | 624 | if (!sirfport->is_atlas7) |
5df83111 | 625 | wr_regl(port, ureg->sirfsoc_int_en_reg, |
8316d04c | 626 | rd_regl(port, ureg->sirfsoc_int_en_reg) | |
c1b7ac6f QL |
627 | SIRFUART_RX_DMA_INT_EN(uint_en, |
628 | sirfport->uart_reg->uart_type)); | |
8316d04c QL |
629 | else |
630 | wr_regl(port, ureg->sirfsoc_int_en_reg, | |
c1b7ac6f QL |
631 | SIRFUART_RX_DMA_INT_EN(uint_en, |
632 | sirfport->uart_reg->uart_type)); | |
8316d04c QL |
633 | } |
634 | ||
635 | static void sirfsoc_uart_start_rx(struct uart_port *port) | |
636 | { | |
637 | struct sirfsoc_uart_port *sirfport = to_sirfport(port); | |
638 | struct sirfsoc_register *ureg = &sirfport->uart_reg->uart_reg; | |
639 | struct sirfsoc_int_en *uint_en = &sirfport->uart_reg->uart_int_en; | |
640 | ||
641 | sirfport->rx_io_count = 0; | |
5df83111 QL |
642 | wr_regl(port, ureg->sirfsoc_rx_fifo_op, SIRFUART_FIFO_RESET); |
643 | wr_regl(port, ureg->sirfsoc_rx_fifo_op, 0); | |
644 | wr_regl(port, ureg->sirfsoc_rx_fifo_op, SIRFUART_FIFO_START); | |
9be16b38 | 645 | if (sirfport->rx_dma_chan) |
8316d04c QL |
646 | sirfsoc_uart_start_next_rx_dma(port); |
647 | else { | |
057badd6 | 648 | if (!sirfport->is_atlas7) |
8316d04c QL |
649 | wr_regl(port, ureg->sirfsoc_int_en_reg, |
650 | rd_regl(port, ureg->sirfsoc_int_en_reg) | | |
c1b7ac6f QL |
651 | SIRFUART_RX_IO_INT_EN(uint_en, |
652 | sirfport->uart_reg->uart_type)); | |
8316d04c QL |
653 | else |
654 | wr_regl(port, ureg->sirfsoc_int_en_reg, | |
c1b7ac6f QL |
655 | SIRFUART_RX_IO_INT_EN(uint_en, |
656 | sirfport->uart_reg->uart_type)); | |
8316d04c | 657 | } |
5df83111 QL |
658 | } |
659 | ||
660 | static unsigned int | |
661 | sirfsoc_usp_calc_sample_div(unsigned long set_rate, | |
662 | unsigned long ioclk_rate, unsigned long *sample_reg) | |
663 | { | |
664 | unsigned long min_delta = ~0UL; | |
665 | unsigned short sample_div; | |
666 | unsigned long ioclk_div = 0; | |
667 | unsigned long temp_delta; | |
668 | ||
cb4595a2 | 669 | for (sample_div = SIRF_USP_MIN_SAMPLE_DIV; |
5df83111 QL |
670 | sample_div <= SIRF_MAX_SAMPLE_DIV; sample_div++) { |
671 | temp_delta = ioclk_rate - | |
672 | (ioclk_rate + (set_rate * sample_div) / 2) | |
673 | / (set_rate * sample_div) * set_rate * sample_div; | |
909102db | 674 | |
5df83111 QL |
675 | temp_delta = (temp_delta > 0) ? temp_delta : -temp_delta; |
676 | if (temp_delta < min_delta) { | |
677 | ioclk_div = (2 * ioclk_rate / | |
678 | (set_rate * sample_div) + 1) / 2 - 1; | |
679 | if (ioclk_div > SIRF_IOCLK_DIV_MAX) | |
680 | continue; | |
681 | min_delta = temp_delta; | |
682 | *sample_reg = sample_div; | |
683 | if (!temp_delta) | |
684 | break; | |
685 | } | |
686 | } | |
687 | return ioclk_div; | |
161e773c RW |
688 | } |
689 | ||
690 | static unsigned int | |
5df83111 QL |
691 | sirfsoc_uart_calc_sample_div(unsigned long baud_rate, |
692 | unsigned long ioclk_rate, unsigned long *set_baud) | |
161e773c RW |
693 | { |
694 | unsigned long min_delta = ~0UL; | |
695 | unsigned short sample_div; | |
696 | unsigned int regv = 0; | |
697 | unsigned long ioclk_div; | |
698 | unsigned long baud_tmp; | |
699 | int temp_delta; | |
700 | ||
701 | for (sample_div = SIRF_MIN_SAMPLE_DIV; | |
702 | sample_div <= SIRF_MAX_SAMPLE_DIV; sample_div++) { | |
703 | ioclk_div = (ioclk_rate / (baud_rate * (sample_div + 1))) - 1; | |
704 | if (ioclk_div > SIRF_IOCLK_DIV_MAX) | |
705 | continue; | |
706 | baud_tmp = ioclk_rate / ((ioclk_div + 1) * (sample_div + 1)); | |
707 | temp_delta = baud_tmp - baud_rate; | |
708 | temp_delta = (temp_delta > 0) ? temp_delta : -temp_delta; | |
709 | if (temp_delta < min_delta) { | |
710 | regv = regv & (~SIRF_IOCLK_DIV_MASK); | |
711 | regv = regv | ioclk_div; | |
712 | regv = regv & (~SIRF_SAMPLE_DIV_MASK); | |
713 | regv = regv | (sample_div << SIRF_SAMPLE_DIV_SHIFT); | |
714 | min_delta = temp_delta; | |
5df83111 | 715 | *set_baud = baud_tmp; |
161e773c RW |
716 | } |
717 | } | |
718 | return regv; | |
719 | } | |
720 | ||
721 | static void sirfsoc_uart_set_termios(struct uart_port *port, | |
722 | struct ktermios *termios, | |
723 | struct ktermios *old) | |
724 | { | |
725 | struct sirfsoc_uart_port *sirfport = to_sirfport(port); | |
5df83111 QL |
726 | struct sirfsoc_register *ureg = &sirfport->uart_reg->uart_reg; |
727 | struct sirfsoc_int_en *uint_en = &sirfport->uart_reg->uart_int_en; | |
161e773c RW |
728 | unsigned long config_reg = 0; |
729 | unsigned long baud_rate; | |
5df83111 | 730 | unsigned long set_baud; |
161e773c RW |
731 | unsigned long flags; |
732 | unsigned long ic; | |
733 | unsigned int clk_div_reg = 0; | |
8316d04c | 734 | unsigned long txfifo_op_reg, ioclk_rate; |
161e773c RW |
735 | unsigned long rx_time_out; |
736 | int threshold_div; | |
5df83111 QL |
737 | u32 data_bit_len, stop_bit_len, len_val; |
738 | unsigned long sample_div_reg = 0xf; | |
739 | ioclk_rate = port->uartclk; | |
161e773c | 740 | |
161e773c RW |
741 | switch (termios->c_cflag & CSIZE) { |
742 | default: | |
743 | case CS8: | |
5df83111 | 744 | data_bit_len = 8; |
161e773c RW |
745 | config_reg |= SIRFUART_DATA_BIT_LEN_8; |
746 | break; | |
747 | case CS7: | |
5df83111 | 748 | data_bit_len = 7; |
161e773c RW |
749 | config_reg |= SIRFUART_DATA_BIT_LEN_7; |
750 | break; | |
751 | case CS6: | |
5df83111 | 752 | data_bit_len = 6; |
161e773c RW |
753 | config_reg |= SIRFUART_DATA_BIT_LEN_6; |
754 | break; | |
755 | case CS5: | |
5df83111 | 756 | data_bit_len = 5; |
161e773c RW |
757 | config_reg |= SIRFUART_DATA_BIT_LEN_5; |
758 | break; | |
759 | } | |
5df83111 | 760 | if (termios->c_cflag & CSTOPB) { |
161e773c | 761 | config_reg |= SIRFUART_STOP_BIT_LEN_2; |
5df83111 QL |
762 | stop_bit_len = 2; |
763 | } else | |
764 | stop_bit_len = 1; | |
765 | ||
161e773c | 766 | spin_lock_irqsave(&port->lock, flags); |
5df83111 | 767 | port->read_status_mask = uint_en->sirfsoc_rx_oflow_en; |
161e773c | 768 | port->ignore_status_mask = 0; |
5df83111 QL |
769 | if (sirfport->uart_reg->uart_type == SIRF_REAL_UART) { |
770 | if (termios->c_iflag & INPCK) | |
771 | port->read_status_mask |= uint_en->sirfsoc_frm_err_en | | |
772 | uint_en->sirfsoc_parity_err_en; | |
2eb5618d | 773 | } else { |
5df83111 QL |
774 | if (termios->c_iflag & INPCK) |
775 | port->read_status_mask |= uint_en->sirfsoc_frm_err_en; | |
776 | } | |
ef8b9ddc | 777 | if (termios->c_iflag & (IGNBRK | BRKINT | PARMRK)) |
5df83111 QL |
778 | port->read_status_mask |= uint_en->sirfsoc_rxd_brk_en; |
779 | if (sirfport->uart_reg->uart_type == SIRF_REAL_UART) { | |
780 | if (termios->c_iflag & IGNPAR) | |
781 | port->ignore_status_mask |= | |
782 | uint_en->sirfsoc_frm_err_en | | |
783 | uint_en->sirfsoc_parity_err_en; | |
784 | if (termios->c_cflag & PARENB) { | |
785 | if (termios->c_cflag & CMSPAR) { | |
786 | if (termios->c_cflag & PARODD) | |
787 | config_reg |= SIRFUART_STICK_BIT_MARK; | |
788 | else | |
789 | config_reg |= SIRFUART_STICK_BIT_SPACE; | |
5df83111 | 790 | } else { |
d9e8e976 QL |
791 | if (termios->c_cflag & PARODD) |
792 | config_reg |= SIRFUART_STICK_BIT_ODD; | |
793 | else | |
794 | config_reg |= SIRFUART_STICK_BIT_EVEN; | |
5df83111 QL |
795 | } |
796 | } | |
2eb5618d | 797 | } else { |
5df83111 QL |
798 | if (termios->c_iflag & IGNPAR) |
799 | port->ignore_status_mask |= | |
800 | uint_en->sirfsoc_frm_err_en; | |
801 | if (termios->c_cflag & PARENB) | |
802 | dev_warn(port->dev, | |
803 | "USP-UART not support parity err\n"); | |
804 | } | |
805 | if (termios->c_iflag & IGNBRK) { | |
161e773c | 806 | port->ignore_status_mask |= |
5df83111 QL |
807 | uint_en->sirfsoc_rxd_brk_en; |
808 | if (termios->c_iflag & IGNPAR) | |
809 | port->ignore_status_mask |= | |
810 | uint_en->sirfsoc_rx_oflow_en; | |
811 | } | |
161e773c RW |
812 | if ((termios->c_cflag & CREAD) == 0) |
813 | port->ignore_status_mask |= SIRFUART_DUMMY_READ; | |
161e773c RW |
814 | /* Hardware Flow Control Settings */ |
815 | if (UART_ENABLE_MS(port, termios->c_cflag)) { | |
816 | if (!sirfport->ms_enabled) | |
817 | sirfsoc_uart_enable_ms(port); | |
818 | } else { | |
819 | if (sirfport->ms_enabled) | |
820 | sirfsoc_uart_disable_ms(port); | |
821 | } | |
5df83111 QL |
822 | baud_rate = uart_get_baud_rate(port, termios, old, 0, 4000000); |
823 | if (ioclk_rate == 150000000) { | |
ac4ce718 BS |
824 | for (ic = 0; ic < SIRF_BAUD_RATE_SUPPORT_NR; ic++) |
825 | if (baud_rate == baudrate_to_regv[ic].baud_rate) | |
826 | clk_div_reg = baudrate_to_regv[ic].reg_val; | |
827 | } | |
5df83111 QL |
828 | set_baud = baud_rate; |
829 | if (sirfport->uart_reg->uart_type == SIRF_REAL_UART) { | |
830 | if (unlikely(clk_div_reg == 0)) | |
831 | clk_div_reg = sirfsoc_uart_calc_sample_div(baud_rate, | |
832 | ioclk_rate, &set_baud); | |
833 | wr_regl(port, ureg->sirfsoc_divisor, clk_div_reg); | |
2eb5618d | 834 | } else { |
5df83111 QL |
835 | clk_div_reg = sirfsoc_usp_calc_sample_div(baud_rate, |
836 | ioclk_rate, &sample_div_reg); | |
837 | sample_div_reg--; | |
838 | set_baud = ((ioclk_rate / (clk_div_reg+1) - 1) / | |
839 | (sample_div_reg + 1)); | |
840 | /* setting usp mode 2 */ | |
459f15c4 QL |
841 | len_val = ((1 << SIRFSOC_USP_MODE2_RXD_DELAY_OFFSET) | |
842 | (1 << SIRFSOC_USP_MODE2_TXD_DELAY_OFFSET)); | |
843 | len_val |= ((clk_div_reg & SIRFSOC_USP_MODE2_CLK_DIVISOR_MASK) | |
844 | << SIRFSOC_USP_MODE2_CLK_DIVISOR_OFFSET); | |
845 | wr_regl(port, ureg->sirfsoc_mode2, len_val); | |
5df83111 | 846 | } |
161e773c | 847 | if (tty_termios_baud_rate(termios)) |
5df83111 QL |
848 | tty_termios_encode_baud_rate(termios, set_baud, set_baud); |
849 | /* set receive timeout && data bits len */ | |
850 | rx_time_out = SIRFSOC_UART_RX_TIMEOUT(set_baud, 20000); | |
851 | rx_time_out = SIRFUART_RECV_TIMEOUT_VALUE(rx_time_out); | |
8316d04c | 852 | txfifo_op_reg = rd_regl(port, ureg->sirfsoc_tx_fifo_op); |
459f15c4 | 853 | wr_regl(port, ureg->sirfsoc_rx_fifo_op, SIRFUART_FIFO_STOP); |
5df83111 | 854 | wr_regl(port, ureg->sirfsoc_tx_fifo_op, |
8316d04c | 855 | (txfifo_op_reg & ~SIRFUART_FIFO_START)); |
5df83111 | 856 | if (sirfport->uart_reg->uart_type == SIRF_REAL_UART) { |
c1b7ac6f | 857 | config_reg |= SIRFUART_UART_RECV_TIMEOUT(rx_time_out); |
5df83111 | 858 | wr_regl(port, ureg->sirfsoc_line_ctrl, config_reg); |
2eb5618d | 859 | } else { |
5df83111 | 860 | /*tx frame ctrl*/ |
459f15c4 QL |
861 | len_val = (data_bit_len - 1) << SIRFSOC_USP_TX_DATA_LEN_OFFSET; |
862 | len_val |= (data_bit_len + 1 + stop_bit_len - 1) << | |
863 | SIRFSOC_USP_TX_FRAME_LEN_OFFSET; | |
864 | len_val |= ((data_bit_len - 1) << | |
865 | SIRFSOC_USP_TX_SHIFTER_LEN_OFFSET); | |
866 | len_val |= (((clk_div_reg & 0xc00) >> 10) << | |
867 | SIRFSOC_USP_TX_CLK_DIVISOR_OFFSET); | |
5df83111 QL |
868 | wr_regl(port, ureg->sirfsoc_tx_frame_ctrl, len_val); |
869 | /*rx frame ctrl*/ | |
459f15c4 QL |
870 | len_val = (data_bit_len - 1) << SIRFSOC_USP_RX_DATA_LEN_OFFSET; |
871 | len_val |= (data_bit_len + 1 + stop_bit_len - 1) << | |
872 | SIRFSOC_USP_RX_FRAME_LEN_OFFSET; | |
873 | len_val |= (data_bit_len - 1) << | |
874 | SIRFSOC_USP_RX_SHIFTER_LEN_OFFSET; | |
875 | len_val |= (((clk_div_reg & 0xf000) >> 12) << | |
876 | SIRFSOC_USP_RX_CLK_DIVISOR_OFFSET); | |
5df83111 QL |
877 | wr_regl(port, ureg->sirfsoc_rx_frame_ctrl, len_val); |
878 | /*async param*/ | |
879 | wr_regl(port, ureg->sirfsoc_async_param_reg, | |
c1b7ac6f | 880 | (SIRFUART_USP_RECV_TIMEOUT(rx_time_out)) | |
459f15c4 QL |
881 | (sample_div_reg & SIRFSOC_USP_ASYNC_DIV2_MASK) << |
882 | SIRFSOC_USP_ASYNC_DIV2_OFFSET); | |
5df83111 | 883 | } |
9be16b38 | 884 | if (sirfport->tx_dma_chan) |
8316d04c QL |
885 | wr_regl(port, ureg->sirfsoc_tx_dma_io_ctrl, SIRFUART_DMA_MODE); |
886 | else | |
887 | wr_regl(port, ureg->sirfsoc_tx_dma_io_ctrl, SIRFUART_IO_MODE); | |
9be16b38 | 888 | if (sirfport->rx_dma_chan) |
8316d04c QL |
889 | wr_regl(port, ureg->sirfsoc_rx_dma_io_ctrl, SIRFUART_DMA_MODE); |
890 | else | |
891 | wr_regl(port, ureg->sirfsoc_rx_dma_io_ctrl, SIRFUART_IO_MODE); | |
0f17e3b4 | 892 | sirfport->rx_period_time = 20000000; |
161e773c | 893 | /* Reset Rx/Tx FIFO Threshold level for proper baudrate */ |
5df83111 | 894 | if (set_baud < 1000000) |
161e773c RW |
895 | threshold_div = 1; |
896 | else | |
897 | threshold_div = 2; | |
8316d04c QL |
898 | wr_regl(port, ureg->sirfsoc_tx_fifo_ctrl, |
899 | SIRFUART_FIFO_THD(port) / threshold_div); | |
900 | wr_regl(port, ureg->sirfsoc_rx_fifo_ctrl, | |
901 | SIRFUART_FIFO_THD(port) / threshold_div); | |
902 | txfifo_op_reg |= SIRFUART_FIFO_START; | |
903 | wr_regl(port, ureg->sirfsoc_tx_fifo_op, txfifo_op_reg); | |
5df83111 | 904 | uart_update_timeout(port, termios->c_cflag, set_baud); |
161e773c | 905 | sirfsoc_uart_start_rx(port); |
5df83111 | 906 | wr_regl(port, ureg->sirfsoc_tx_rx_en, SIRFUART_TX_EN | SIRFUART_RX_EN); |
161e773c RW |
907 | spin_unlock_irqrestore(&port->lock, flags); |
908 | } | |
909 | ||
388faf9f QL |
910 | static void sirfsoc_uart_pm(struct uart_port *port, unsigned int state, |
911 | unsigned int oldstate) | |
912 | { | |
913 | struct sirfsoc_uart_port *sirfport = to_sirfport(port); | |
4b8038dc | 914 | if (!state) |
388faf9f | 915 | clk_prepare_enable(sirfport->clk); |
4b8038dc | 916 | else |
388faf9f QL |
917 | clk_disable_unprepare(sirfport->clk); |
918 | } | |
919 | ||
161e773c RW |
920 | static int sirfsoc_uart_startup(struct uart_port *port) |
921 | { | |
922 | struct sirfsoc_uart_port *sirfport = to_sirfport(port); | |
15cdcb12 | 923 | struct sirfsoc_register *ureg = &sirfport->uart_reg->uart_reg; |
161e773c RW |
924 | unsigned int index = port->line; |
925 | int ret; | |
2a446241 | 926 | irq_modify_status(port->irq, IRQ_NOREQUEST, IRQ_NOAUTOEN); |
161e773c RW |
927 | ret = request_irq(port->irq, |
928 | sirfsoc_uart_isr, | |
929 | 0, | |
930 | SIRFUART_PORT_NAME, | |
931 | sirfport); | |
932 | if (ret != 0) { | |
933 | dev_err(port->dev, "UART%d request IRQ line (%d) failed.\n", | |
934 | index, port->irq); | |
935 | goto irq_err; | |
936 | } | |
15cdcb12 QL |
937 | /* initial hardware settings */ |
938 | wr_regl(port, ureg->sirfsoc_tx_dma_io_ctrl, | |
939 | rd_regl(port, ureg->sirfsoc_tx_dma_io_ctrl) | | |
940 | SIRFUART_IO_MODE); | |
941 | wr_regl(port, ureg->sirfsoc_rx_dma_io_ctrl, | |
942 | rd_regl(port, ureg->sirfsoc_rx_dma_io_ctrl) | | |
943 | SIRFUART_IO_MODE); | |
0f17e3b4 QL |
944 | wr_regl(port, ureg->sirfsoc_rx_dma_io_ctrl, |
945 | rd_regl(port, ureg->sirfsoc_rx_dma_io_ctrl) & | |
946 | ~SIRFUART_RX_DMA_FLUSH); | |
15cdcb12 QL |
947 | wr_regl(port, ureg->sirfsoc_tx_dma_io_len, 0); |
948 | wr_regl(port, ureg->sirfsoc_rx_dma_io_len, 0); | |
949 | wr_regl(port, ureg->sirfsoc_tx_rx_en, SIRFUART_RX_EN | SIRFUART_TX_EN); | |
950 | if (sirfport->uart_reg->uart_type == SIRF_USP_UART) | |
951 | wr_regl(port, ureg->sirfsoc_mode1, | |
952 | SIRFSOC_USP_ENDIAN_CTRL_LSBF | | |
953 | SIRFSOC_USP_EN); | |
954 | wr_regl(port, ureg->sirfsoc_tx_fifo_op, SIRFUART_FIFO_RESET); | |
15cdcb12 QL |
955 | wr_regl(port, ureg->sirfsoc_rx_fifo_op, SIRFUART_FIFO_RESET); |
956 | wr_regl(port, ureg->sirfsoc_rx_fifo_op, 0); | |
957 | wr_regl(port, ureg->sirfsoc_tx_fifo_ctrl, SIRFUART_FIFO_THD(port)); | |
958 | wr_regl(port, ureg->sirfsoc_rx_fifo_ctrl, SIRFUART_FIFO_THD(port)); | |
9be16b38 | 959 | if (sirfport->rx_dma_chan) |
8316d04c | 960 | wr_regl(port, ureg->sirfsoc_rx_fifo_level_chk, |
9be16b38 QL |
961 | SIRFUART_RX_FIFO_CHK_SC(port->line, 0x4) | |
962 | SIRFUART_RX_FIFO_CHK_LC(port->line, 0xe) | | |
963 | SIRFUART_RX_FIFO_CHK_HC(port->line, 0x1b)); | |
964 | if (sirfport->tx_dma_chan) { | |
8316d04c QL |
965 | sirfport->tx_dma_state = TX_DMA_IDLE; |
966 | wr_regl(port, ureg->sirfsoc_tx_fifo_level_chk, | |
967 | SIRFUART_TX_FIFO_CHK_SC(port->line, 0x1b) | | |
968 | SIRFUART_TX_FIFO_CHK_LC(port->line, 0xe) | | |
969 | SIRFUART_TX_FIFO_CHK_HC(port->line, 0x4)); | |
970 | } | |
2eb5618d QL |
971 | sirfport->ms_enabled = false; |
972 | if (sirfport->uart_reg->uart_type == SIRF_USP_UART && | |
973 | sirfport->hw_flow_ctrl) { | |
2a446241 RH |
974 | irq_modify_status(gpio_to_irq(sirfport->cts_gpio), |
975 | IRQ_NOREQUEST, IRQ_NOAUTOEN); | |
2eb5618d QL |
976 | ret = request_irq(gpio_to_irq(sirfport->cts_gpio), |
977 | sirfsoc_uart_usp_cts_handler, IRQF_TRIGGER_FALLING | | |
978 | IRQF_TRIGGER_RISING, "usp_cts_irq", sirfport); | |
979 | if (ret != 0) { | |
980 | dev_err(port->dev, "UART-USP:request gpio irq fail\n"); | |
981 | goto init_rx_err; | |
982 | } | |
983 | } | |
161e773c | 984 | enable_irq(port->irq); |
0f17e3b4 QL |
985 | if (sirfport->rx_dma_chan && !sirfport->is_hrt_enabled) { |
986 | sirfport->is_hrt_enabled = true; | |
987 | sirfport->rx_period_time = 20000000; | |
988 | sirfport->rx_dma_items.xmit.tail = | |
989 | sirfport->rx_dma_items.xmit.head = 0; | |
990 | hrtimer_start(&sirfport->hrt, | |
991 | ns_to_ktime(sirfport->rx_period_time), | |
992 | HRTIMER_MODE_REL); | |
993 | } | |
2eb5618d | 994 | |
15cdcb12 | 995 | return 0; |
2eb5618d QL |
996 | init_rx_err: |
997 | free_irq(port->irq, sirfport); | |
161e773c RW |
998 | irq_err: |
999 | return ret; | |
1000 | } | |
1001 | ||
1002 | static void sirfsoc_uart_shutdown(struct uart_port *port) | |
1003 | { | |
1004 | struct sirfsoc_uart_port *sirfport = to_sirfport(port); | |
5df83111 | 1005 | struct sirfsoc_register *ureg = &sirfport->uart_reg->uart_reg; |
057badd6 | 1006 | if (!sirfport->is_atlas7) |
5df83111 | 1007 | wr_regl(port, ureg->sirfsoc_int_en_reg, 0); |
909102db | 1008 | else |
c1b7ac6f | 1009 | wr_regl(port, ureg->sirfsoc_int_en_clr_reg, ~0UL); |
909102db | 1010 | |
161e773c | 1011 | free_irq(port->irq, sirfport); |
2eb5618d | 1012 | if (sirfport->ms_enabled) |
161e773c | 1013 | sirfsoc_uart_disable_ms(port); |
2eb5618d QL |
1014 | if (sirfport->uart_reg->uart_type == SIRF_USP_UART && |
1015 | sirfport->hw_flow_ctrl) { | |
1016 | gpio_set_value(sirfport->rts_gpio, 1); | |
1017 | free_irq(gpio_to_irq(sirfport->cts_gpio), sirfport); | |
161e773c | 1018 | } |
9be16b38 | 1019 | if (sirfport->tx_dma_chan) |
8316d04c | 1020 | sirfport->tx_dma_state = TX_DMA_IDLE; |
0f17e3b4 QL |
1021 | if (sirfport->rx_dma_chan && sirfport->is_hrt_enabled) { |
1022 | while ((rd_regl(port, ureg->sirfsoc_rx_fifo_status) & | |
1023 | SIRFUART_RX_FIFO_MASK) > 0) | |
1024 | ; | |
1025 | sirfport->is_hrt_enabled = false; | |
1026 | hrtimer_cancel(&sirfport->hrt); | |
1027 | } | |
161e773c RW |
1028 | } |
1029 | ||
1030 | static const char *sirfsoc_uart_type(struct uart_port *port) | |
1031 | { | |
1032 | return port->type == SIRFSOC_PORT_TYPE ? SIRFUART_PORT_NAME : NULL; | |
1033 | } | |
1034 | ||
1035 | static int sirfsoc_uart_request_port(struct uart_port *port) | |
1036 | { | |
5df83111 QL |
1037 | struct sirfsoc_uart_port *sirfport = to_sirfport(port); |
1038 | struct sirfsoc_uart_param *uart_param = &sirfport->uart_reg->uart_param; | |
161e773c RW |
1039 | void *ret; |
1040 | ret = request_mem_region(port->mapbase, | |
5df83111 | 1041 | SIRFUART_MAP_SIZE, uart_param->port_name); |
161e773c RW |
1042 | return ret ? 0 : -EBUSY; |
1043 | } | |
1044 | ||
1045 | static void sirfsoc_uart_release_port(struct uart_port *port) | |
1046 | { | |
1047 | release_mem_region(port->mapbase, SIRFUART_MAP_SIZE); | |
1048 | } | |
1049 | ||
1050 | static void sirfsoc_uart_config_port(struct uart_port *port, int flags) | |
1051 | { | |
1052 | if (flags & UART_CONFIG_TYPE) { | |
1053 | port->type = SIRFSOC_PORT_TYPE; | |
1054 | sirfsoc_uart_request_port(port); | |
1055 | } | |
1056 | } | |
1057 | ||
1058 | static struct uart_ops sirfsoc_uart_ops = { | |
1059 | .tx_empty = sirfsoc_uart_tx_empty, | |
1060 | .get_mctrl = sirfsoc_uart_get_mctrl, | |
1061 | .set_mctrl = sirfsoc_uart_set_mctrl, | |
1062 | .stop_tx = sirfsoc_uart_stop_tx, | |
1063 | .start_tx = sirfsoc_uart_start_tx, | |
1064 | .stop_rx = sirfsoc_uart_stop_rx, | |
1065 | .enable_ms = sirfsoc_uart_enable_ms, | |
1066 | .break_ctl = sirfsoc_uart_break_ctl, | |
1067 | .startup = sirfsoc_uart_startup, | |
1068 | .shutdown = sirfsoc_uart_shutdown, | |
1069 | .set_termios = sirfsoc_uart_set_termios, | |
388faf9f | 1070 | .pm = sirfsoc_uart_pm, |
161e773c RW |
1071 | .type = sirfsoc_uart_type, |
1072 | .release_port = sirfsoc_uart_release_port, | |
1073 | .request_port = sirfsoc_uart_request_port, | |
1074 | .config_port = sirfsoc_uart_config_port, | |
1075 | }; | |
1076 | ||
1077 | #ifdef CONFIG_SERIAL_SIRFSOC_CONSOLE | |
5df83111 QL |
1078 | static int __init |
1079 | sirfsoc_uart_console_setup(struct console *co, char *options) | |
161e773c RW |
1080 | { |
1081 | unsigned int baud = 115200; | |
1082 | unsigned int bits = 8; | |
1083 | unsigned int parity = 'n'; | |
1084 | unsigned int flow = 'n'; | |
a6ffe896 QL |
1085 | struct sirfsoc_uart_port *sirfport; |
1086 | struct sirfsoc_register *ureg; | |
161e773c | 1087 | if (co->index < 0 || co->index >= SIRFSOC_UART_NR) |
c35b49b7 | 1088 | co->index = 1; |
a6ffe896 QL |
1089 | sirfport = sirf_ports[co->index]; |
1090 | if (!sirfport) | |
1091 | return -ENODEV; | |
1092 | ureg = &sirfport->uart_reg->uart_reg; | |
1093 | if (!sirfport->port.mapbase) | |
161e773c RW |
1094 | return -ENODEV; |
1095 | ||
5df83111 QL |
1096 | /* enable usp in mode1 register */ |
1097 | if (sirfport->uart_reg->uart_type == SIRF_USP_UART) | |
a6ffe896 | 1098 | wr_regl(&sirfport->port, ureg->sirfsoc_mode1, SIRFSOC_USP_EN | |
5df83111 | 1099 | SIRFSOC_USP_ENDIAN_CTRL_LSBF); |
161e773c RW |
1100 | if (options) |
1101 | uart_parse_options(options, &baud, &parity, &bits, &flow); | |
a6ffe896 | 1102 | sirfport->port.cons = co; |
5df83111 | 1103 | |
8316d04c | 1104 | /* default console tx/rx transfer using io mode */ |
9be16b38 QL |
1105 | sirfport->rx_dma_chan = NULL; |
1106 | sirfport->tx_dma_chan = NULL; | |
a6ffe896 | 1107 | return uart_set_options(&sirfport->port, co, baud, parity, bits, flow); |
161e773c RW |
1108 | } |
1109 | ||
1110 | static void sirfsoc_uart_console_putchar(struct uart_port *port, int ch) | |
1111 | { | |
5df83111 QL |
1112 | struct sirfsoc_uart_port *sirfport = to_sirfport(port); |
1113 | struct sirfsoc_register *ureg = &sirfport->uart_reg->uart_reg; | |
1114 | struct sirfsoc_fifo_status *ufifo_st = &sirfport->uart_reg->fifo_status; | |
cb4595a2 QL |
1115 | while (rd_regl(port, ureg->sirfsoc_tx_fifo_status) & |
1116 | ufifo_st->ff_full(port)) | |
161e773c | 1117 | cpu_relax(); |
205c384f | 1118 | wr_regl(port, ureg->sirfsoc_tx_fifo_data, ch); |
161e773c RW |
1119 | } |
1120 | ||
1121 | static void sirfsoc_uart_console_write(struct console *co, const char *s, | |
1122 | unsigned int count) | |
1123 | { | |
a6ffe896 QL |
1124 | struct sirfsoc_uart_port *sirfport = sirf_ports[co->index]; |
1125 | ||
1126 | uart_console_write(&sirfport->port, s, count, | |
1127 | sirfsoc_uart_console_putchar); | |
161e773c RW |
1128 | } |
1129 | ||
1130 | static struct console sirfsoc_uart_console = { | |
1131 | .name = SIRFSOC_UART_NAME, | |
1132 | .device = uart_console_device, | |
1133 | .flags = CON_PRINTBUFFER, | |
1134 | .index = -1, | |
1135 | .write = sirfsoc_uart_console_write, | |
1136 | .setup = sirfsoc_uart_console_setup, | |
1137 | .data = &sirfsoc_uart_drv, | |
1138 | }; | |
1139 | ||
1140 | static int __init sirfsoc_uart_console_init(void) | |
1141 | { | |
1142 | register_console(&sirfsoc_uart_console); | |
1143 | return 0; | |
1144 | } | |
1145 | console_initcall(sirfsoc_uart_console_init); | |
1146 | #endif | |
1147 | ||
1148 | static struct uart_driver sirfsoc_uart_drv = { | |
1149 | .owner = THIS_MODULE, | |
1150 | .driver_name = SIRFUART_PORT_NAME, | |
1151 | .nr = SIRFSOC_UART_NR, | |
1152 | .dev_name = SIRFSOC_UART_NAME, | |
1153 | .major = SIRFSOC_UART_MAJOR, | |
1154 | .minor = SIRFSOC_UART_MINOR, | |
1155 | #ifdef CONFIG_SERIAL_SIRFSOC_CONSOLE | |
1156 | .cons = &sirfsoc_uart_console, | |
1157 | #else | |
1158 | .cons = NULL, | |
1159 | #endif | |
1160 | }; | |
1161 | ||
0f17e3b4 QL |
1162 | static enum hrtimer_restart |
1163 | sirfsoc_uart_rx_dma_hrtimer_callback(struct hrtimer *hrt) | |
1164 | { | |
1165 | struct sirfsoc_uart_port *sirfport; | |
1166 | struct uart_port *port; | |
1167 | int count, inserted; | |
1168 | struct dma_tx_state tx_state; | |
1169 | struct tty_struct *tty; | |
1170 | struct sirfsoc_register *ureg; | |
1171 | struct circ_buf *xmit; | |
1172 | ||
1173 | sirfport = container_of(hrt, struct sirfsoc_uart_port, hrt); | |
1174 | port = &sirfport->port; | |
1175 | inserted = 0; | |
1176 | tty = port->state->port.tty; | |
1177 | ureg = &sirfport->uart_reg->uart_reg; | |
1178 | xmit = &sirfport->rx_dma_items.xmit; | |
1179 | dmaengine_tx_status(sirfport->rx_dma_chan, | |
1180 | sirfport->rx_dma_items.cookie, &tx_state); | |
1181 | xmit->head = SIRFSOC_RX_DMA_BUF_SIZE - tx_state.residue; | |
1182 | count = CIRC_CNT_TO_END(xmit->head, xmit->tail, | |
1183 | SIRFSOC_RX_DMA_BUF_SIZE); | |
1184 | while (count > 0) { | |
1185 | inserted = tty_insert_flip_string(tty->port, | |
1186 | (const unsigned char *)&xmit->buf[xmit->tail], count); | |
1187 | if (!inserted) | |
1188 | goto next_hrt; | |
1189 | port->icount.rx += inserted; | |
1190 | xmit->tail = (xmit->tail + inserted) & | |
1191 | (SIRFSOC_RX_DMA_BUF_SIZE - 1); | |
1192 | count = CIRC_CNT_TO_END(xmit->head, xmit->tail, | |
1193 | SIRFSOC_RX_DMA_BUF_SIZE); | |
1194 | tty_flip_buffer_push(tty->port); | |
1195 | } | |
1196 | /* | |
1197 | * if RX DMA buffer data have all push into tty buffer, and there is | |
1198 | * only little data(less than a dma transfer unit) left in rxfifo, | |
1199 | * fetch it out in pio mode and switch back to dma immediately | |
1200 | */ | |
1201 | if (!inserted && !count && | |
1202 | ((rd_regl(port, ureg->sirfsoc_rx_fifo_status) & | |
1203 | SIRFUART_RX_FIFO_MASK) > 0)) { | |
1204 | /* switch to pio mode */ | |
1205 | wr_regl(port, ureg->sirfsoc_rx_dma_io_ctrl, | |
1206 | rd_regl(port, ureg->sirfsoc_rx_dma_io_ctrl) | | |
1207 | SIRFUART_IO_MODE); | |
1208 | while ((rd_regl(port, ureg->sirfsoc_rx_fifo_status) & | |
1209 | SIRFUART_RX_FIFO_MASK) > 0) { | |
1210 | if (sirfsoc_uart_pio_rx_chars(port, 16) > 0) | |
1211 | tty_flip_buffer_push(tty->port); | |
1212 | } | |
1213 | wr_regl(port, ureg->sirfsoc_rx_fifo_op, SIRFUART_FIFO_RESET); | |
1214 | wr_regl(port, ureg->sirfsoc_rx_fifo_op, 0); | |
1215 | wr_regl(port, ureg->sirfsoc_rx_fifo_op, SIRFUART_FIFO_START); | |
1216 | /* switch back to dma mode */ | |
1217 | wr_regl(port, ureg->sirfsoc_rx_dma_io_ctrl, | |
1218 | rd_regl(port, ureg->sirfsoc_rx_dma_io_ctrl) & | |
1219 | ~SIRFUART_IO_MODE); | |
1220 | } | |
1221 | next_hrt: | |
1222 | hrtimer_forward_now(hrt, ns_to_ktime(sirfport->rx_period_time)); | |
1223 | return HRTIMER_RESTART; | |
1224 | } | |
1225 | ||
c1b7ac6f | 1226 | static struct of_device_id sirfsoc_uart_ids[] = { |
5df83111 | 1227 | { .compatible = "sirf,prima2-uart", .data = &sirfsoc_uart,}, |
057badd6 | 1228 | { .compatible = "sirf,atlas7-uart", .data = &sirfsoc_uart}, |
5df83111 | 1229 | { .compatible = "sirf,prima2-usp-uart", .data = &sirfsoc_usp}, |
c1b7ac6f | 1230 | { .compatible = "sirf,atlas7-usp-uart", .data = &sirfsoc_usp}, |
5df83111 QL |
1231 | {} |
1232 | }; | |
1233 | MODULE_DEVICE_TABLE(of, sirfsoc_uart_ids); | |
1234 | ||
ada1f443 | 1235 | static int sirfsoc_uart_probe(struct platform_device *pdev) |
161e773c RW |
1236 | { |
1237 | struct sirfsoc_uart_port *sirfport; | |
1238 | struct uart_port *port; | |
1239 | struct resource *res; | |
1240 | int ret; | |
9be16b38 QL |
1241 | struct dma_slave_config slv_cfg = { |
1242 | .src_maxburst = 2, | |
1243 | }; | |
1244 | struct dma_slave_config tx_slv_cfg = { | |
1245 | .dst_maxburst = 2, | |
1246 | }; | |
5df83111 | 1247 | const struct of_device_id *match; |
161e773c | 1248 | |
5df83111 | 1249 | match = of_match_node(sirfsoc_uart_ids, pdev->dev.of_node); |
a6ffe896 QL |
1250 | sirfport = devm_kzalloc(&pdev->dev, sizeof(*sirfport), GFP_KERNEL); |
1251 | if (!sirfport) { | |
1252 | ret = -ENOMEM; | |
161e773c RW |
1253 | goto err; |
1254 | } | |
a6ffe896 QL |
1255 | sirfport->port.line = of_alias_get_id(pdev->dev.of_node, "serial"); |
1256 | sirf_ports[sirfport->port.line] = sirfport; | |
1257 | sirfport->port.iotype = UPIO_MEM; | |
1258 | sirfport->port.flags = UPF_BOOT_AUTOCONF; | |
161e773c RW |
1259 | port = &sirfport->port; |
1260 | port->dev = &pdev->dev; | |
1261 | port->private_data = sirfport; | |
5df83111 | 1262 | sirfport->uart_reg = (struct sirfsoc_uart_register *)match->data; |
161e773c | 1263 | |
2eb5618d QL |
1264 | sirfport->hw_flow_ctrl = of_property_read_bool(pdev->dev.of_node, |
1265 | "sirf,uart-has-rtscts"); | |
c1b7ac6f QL |
1266 | if (of_device_is_compatible(pdev->dev.of_node, "sirf,prima2-uart") || |
1267 | of_device_is_compatible(pdev->dev.of_node, "sirf,atlas7-uart")) | |
5df83111 | 1268 | sirfport->uart_reg->uart_type = SIRF_REAL_UART; |
c1b7ac6f QL |
1269 | if (of_device_is_compatible(pdev->dev.of_node, |
1270 | "sirf,prima2-usp-uart") || of_device_is_compatible( | |
1271 | pdev->dev.of_node, "sirf,atlas7-usp-uart")) { | |
5df83111 | 1272 | sirfport->uart_reg->uart_type = SIRF_USP_UART; |
2eb5618d QL |
1273 | if (!sirfport->hw_flow_ctrl) |
1274 | goto usp_no_flow_control; | |
1275 | if (of_find_property(pdev->dev.of_node, "cts-gpios", NULL)) | |
1276 | sirfport->cts_gpio = of_get_named_gpio( | |
1277 | pdev->dev.of_node, "cts-gpios", 0); | |
1278 | else | |
1279 | sirfport->cts_gpio = -1; | |
1280 | if (of_find_property(pdev->dev.of_node, "rts-gpios", NULL)) | |
1281 | sirfport->rts_gpio = of_get_named_gpio( | |
1282 | pdev->dev.of_node, "rts-gpios", 0); | |
1283 | else | |
1284 | sirfport->rts_gpio = -1; | |
1285 | ||
1286 | if ((!gpio_is_valid(sirfport->cts_gpio) || | |
1287 | !gpio_is_valid(sirfport->rts_gpio))) { | |
1288 | ret = -EINVAL; | |
1289 | dev_err(&pdev->dev, | |
67bc306c | 1290 | "Usp flow control must have cts and rts gpio"); |
2eb5618d QL |
1291 | goto err; |
1292 | } | |
1293 | ret = devm_gpio_request(&pdev->dev, sirfport->cts_gpio, | |
67bc306c | 1294 | "usp-cts-gpio"); |
2eb5618d | 1295 | if (ret) { |
67bc306c | 1296 | dev_err(&pdev->dev, "Unable request cts gpio"); |
2eb5618d QL |
1297 | goto err; |
1298 | } | |
1299 | gpio_direction_input(sirfport->cts_gpio); | |
1300 | ret = devm_gpio_request(&pdev->dev, sirfport->rts_gpio, | |
67bc306c | 1301 | "usp-rts-gpio"); |
2eb5618d | 1302 | if (ret) { |
67bc306c | 1303 | dev_err(&pdev->dev, "Unable request rts gpio"); |
2eb5618d QL |
1304 | goto err; |
1305 | } | |
1306 | gpio_direction_output(sirfport->rts_gpio, 1); | |
1307 | } | |
1308 | usp_no_flow_control: | |
c1b7ac6f QL |
1309 | if (of_device_is_compatible(pdev->dev.of_node, "sirf,atlas7-uart") || |
1310 | of_device_is_compatible(pdev->dev.of_node, "sirf,atlas7-usp-uart")) | |
057badd6 | 1311 | sirfport->is_atlas7 = true; |
909102db | 1312 | |
161e773c RW |
1313 | if (of_property_read_u32(pdev->dev.of_node, |
1314 | "fifosize", | |
1315 | &port->fifosize)) { | |
1316 | dev_err(&pdev->dev, | |
1317 | "Unable to find fifosize in uart node.\n"); | |
1318 | ret = -EFAULT; | |
1319 | goto err; | |
1320 | } | |
1321 | ||
1322 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
1323 | if (res == NULL) { | |
1324 | dev_err(&pdev->dev, "Insufficient resources.\n"); | |
1325 | ret = -EFAULT; | |
1326 | goto err; | |
1327 | } | |
1328 | port->mapbase = res->start; | |
0f17e3b4 QL |
1329 | port->membase = devm_ioremap(&pdev->dev, |
1330 | res->start, resource_size(res)); | |
161e773c RW |
1331 | if (!port->membase) { |
1332 | dev_err(&pdev->dev, "Cannot remap resource.\n"); | |
1333 | ret = -ENOMEM; | |
1334 | goto err; | |
1335 | } | |
1336 | res = platform_get_resource(pdev, IORESOURCE_IRQ, 0); | |
1337 | if (res == NULL) { | |
1338 | dev_err(&pdev->dev, "Insufficient resources.\n"); | |
1339 | ret = -EFAULT; | |
9250dd57 | 1340 | goto err; |
161e773c RW |
1341 | } |
1342 | port->irq = res->start; | |
1343 | ||
adeede73 | 1344 | sirfport->clk = devm_clk_get(&pdev->dev, NULL); |
ac4ce718 BS |
1345 | if (IS_ERR(sirfport->clk)) { |
1346 | ret = PTR_ERR(sirfport->clk); | |
a343756e | 1347 | goto err; |
ac4ce718 | 1348 | } |
ac4ce718 BS |
1349 | port->uartclk = clk_get_rate(sirfport->clk); |
1350 | ||
161e773c RW |
1351 | port->ops = &sirfsoc_uart_ops; |
1352 | spin_lock_init(&port->lock); | |
1353 | ||
1354 | platform_set_drvdata(pdev, sirfport); | |
1355 | ret = uart_add_one_port(&sirfsoc_uart_drv, port); | |
1356 | if (ret != 0) { | |
1357 | dev_err(&pdev->dev, "Cannot add UART port(%d).\n", pdev->id); | |
adeede73 | 1358 | goto err; |
161e773c RW |
1359 | } |
1360 | ||
9be16b38 | 1361 | sirfport->rx_dma_chan = dma_request_slave_channel(port->dev, "rx"); |
0f17e3b4 QL |
1362 | sirfport->rx_dma_items.xmit.buf = |
1363 | dma_alloc_coherent(port->dev, SIRFSOC_RX_DMA_BUF_SIZE, | |
1364 | &sirfport->rx_dma_items.dma_addr, GFP_KERNEL); | |
1365 | if (!sirfport->rx_dma_items.xmit.buf) { | |
1366 | dev_err(port->dev, "Uart alloc bufa failed\n"); | |
1367 | ret = -ENOMEM; | |
1368 | goto alloc_coherent_err; | |
9be16b38 | 1369 | } |
0f17e3b4 QL |
1370 | sirfport->rx_dma_items.xmit.head = |
1371 | sirfport->rx_dma_items.xmit.tail = 0; | |
9be16b38 QL |
1372 | if (sirfport->rx_dma_chan) |
1373 | dmaengine_slave_config(sirfport->rx_dma_chan, &slv_cfg); | |
1374 | sirfport->tx_dma_chan = dma_request_slave_channel(port->dev, "tx"); | |
1375 | if (sirfport->tx_dma_chan) | |
1376 | dmaengine_slave_config(sirfport->tx_dma_chan, &tx_slv_cfg); | |
0f17e3b4 QL |
1377 | if (sirfport->rx_dma_chan) { |
1378 | hrtimer_init(&sirfport->hrt, CLOCK_MONOTONIC, HRTIMER_MODE_REL); | |
1379 | sirfport->hrt.function = sirfsoc_uart_rx_dma_hrtimer_callback; | |
1380 | sirfport->is_hrt_enabled = false; | |
1381 | } | |
161e773c | 1382 | |
9be16b38 QL |
1383 | return 0; |
1384 | alloc_coherent_err: | |
0f17e3b4 QL |
1385 | dma_free_coherent(port->dev, SIRFSOC_RX_DMA_BUF_SIZE, |
1386 | sirfport->rx_dma_items.xmit.buf, | |
1387 | sirfport->rx_dma_items.dma_addr); | |
9be16b38 | 1388 | dma_release_channel(sirfport->rx_dma_chan); |
161e773c RW |
1389 | err: |
1390 | return ret; | |
1391 | } | |
1392 | ||
1393 | static int sirfsoc_uart_remove(struct platform_device *pdev) | |
1394 | { | |
1395 | struct sirfsoc_uart_port *sirfport = platform_get_drvdata(pdev); | |
1396 | struct uart_port *port = &sirfport->port; | |
161e773c | 1397 | uart_remove_one_port(&sirfsoc_uart_drv, port); |
9be16b38 | 1398 | if (sirfport->rx_dma_chan) { |
9be16b38 QL |
1399 | dmaengine_terminate_all(sirfport->rx_dma_chan); |
1400 | dma_release_channel(sirfport->rx_dma_chan); | |
0f17e3b4 QL |
1401 | dma_free_coherent(port->dev, SIRFSOC_RX_DMA_BUF_SIZE, |
1402 | sirfport->rx_dma_items.xmit.buf, | |
1403 | sirfport->rx_dma_items.dma_addr); | |
9be16b38 QL |
1404 | } |
1405 | if (sirfport->tx_dma_chan) { | |
1406 | dmaengine_terminate_all(sirfport->tx_dma_chan); | |
1407 | dma_release_channel(sirfport->tx_dma_chan); | |
1408 | } | |
161e773c RW |
1409 | return 0; |
1410 | } | |
1411 | ||
99e626f5 | 1412 | #ifdef CONFIG_PM_SLEEP |
161e773c | 1413 | static int |
99e626f5 | 1414 | sirfsoc_uart_suspend(struct device *pdev) |
161e773c | 1415 | { |
99e626f5 | 1416 | struct sirfsoc_uart_port *sirfport = dev_get_drvdata(pdev); |
161e773c RW |
1417 | struct uart_port *port = &sirfport->port; |
1418 | uart_suspend_port(&sirfsoc_uart_drv, port); | |
1419 | return 0; | |
1420 | } | |
1421 | ||
99e626f5 | 1422 | static int sirfsoc_uart_resume(struct device *pdev) |
161e773c | 1423 | { |
99e626f5 | 1424 | struct sirfsoc_uart_port *sirfport = dev_get_drvdata(pdev); |
161e773c RW |
1425 | struct uart_port *port = &sirfport->port; |
1426 | uart_resume_port(&sirfsoc_uart_drv, port); | |
1427 | return 0; | |
1428 | } | |
99e626f5 QL |
1429 | #endif |
1430 | ||
1431 | static const struct dev_pm_ops sirfsoc_uart_pm_ops = { | |
1432 | SET_SYSTEM_SLEEP_PM_OPS(sirfsoc_uart_suspend, sirfsoc_uart_resume) | |
1433 | }; | |
161e773c | 1434 | |
161e773c RW |
1435 | static struct platform_driver sirfsoc_uart_driver = { |
1436 | .probe = sirfsoc_uart_probe, | |
2d47b716 | 1437 | .remove = sirfsoc_uart_remove, |
161e773c RW |
1438 | .driver = { |
1439 | .name = SIRFUART_PORT_NAME, | |
161e773c | 1440 | .of_match_table = sirfsoc_uart_ids, |
99e626f5 | 1441 | .pm = &sirfsoc_uart_pm_ops, |
161e773c RW |
1442 | }, |
1443 | }; | |
1444 | ||
1445 | static int __init sirfsoc_uart_init(void) | |
1446 | { | |
1447 | int ret = 0; | |
1448 | ||
1449 | ret = uart_register_driver(&sirfsoc_uart_drv); | |
1450 | if (ret) | |
1451 | goto out; | |
1452 | ||
1453 | ret = platform_driver_register(&sirfsoc_uart_driver); | |
1454 | if (ret) | |
1455 | uart_unregister_driver(&sirfsoc_uart_drv); | |
1456 | out: | |
1457 | return ret; | |
1458 | } | |
1459 | module_init(sirfsoc_uart_init); | |
1460 | ||
1461 | static void __exit sirfsoc_uart_exit(void) | |
1462 | { | |
1463 | platform_driver_unregister(&sirfsoc_uart_driver); | |
1464 | uart_unregister_driver(&sirfsoc_uart_drv); | |
1465 | } | |
1466 | module_exit(sirfsoc_uart_exit); | |
1467 | ||
1468 | MODULE_LICENSE("GPL v2"); | |
1469 | MODULE_AUTHOR("Bin Shi <Bin.Shi@csr.com>, Rong Wang<Rong.Wang@csr.com>"); | |
1470 | MODULE_DESCRIPTION("CSR SiRFprimaII Uart Driver"); |