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c4f52879 KR |
1 | // SPDX-License-Identifier: GPL-2.0 |
2 | // Copyright (c) 2017-2018, The Linux foundation. All rights reserved. | |
3 | ||
4 | #include <linux/clk.h> | |
5 | #include <linux/console.h> | |
6 | #include <linux/io.h> | |
7 | #include <linux/iopoll.h> | |
8 | #include <linux/module.h> | |
9 | #include <linux/of.h> | |
10 | #include <linux/of_device.h> | |
11 | #include <linux/platform_device.h> | |
12 | #include <linux/qcom-geni-se.h> | |
13 | #include <linux/serial.h> | |
14 | #include <linux/serial_core.h> | |
15 | #include <linux/slab.h> | |
16 | #include <linux/tty.h> | |
17 | #include <linux/tty_flip.h> | |
18 | ||
19 | /* UART specific GENI registers */ | |
20 | #define SE_UART_TX_TRANS_CFG 0x25c | |
21 | #define SE_UART_TX_WORD_LEN 0x268 | |
22 | #define SE_UART_TX_STOP_BIT_LEN 0x26c | |
23 | #define SE_UART_TX_TRANS_LEN 0x270 | |
24 | #define SE_UART_RX_TRANS_CFG 0x280 | |
25 | #define SE_UART_RX_WORD_LEN 0x28c | |
26 | #define SE_UART_RX_STALE_CNT 0x294 | |
27 | #define SE_UART_TX_PARITY_CFG 0x2a4 | |
28 | #define SE_UART_RX_PARITY_CFG 0x2a8 | |
29 | ||
30 | /* SE_UART_TRANS_CFG */ | |
31 | #define UART_TX_PAR_EN BIT(0) | |
32 | #define UART_CTS_MASK BIT(1) | |
33 | ||
34 | /* SE_UART_TX_WORD_LEN */ | |
35 | #define TX_WORD_LEN_MSK GENMASK(9, 0) | |
36 | ||
37 | /* SE_UART_TX_STOP_BIT_LEN */ | |
38 | #define TX_STOP_BIT_LEN_MSK GENMASK(23, 0) | |
39 | #define TX_STOP_BIT_LEN_1 0 | |
40 | #define TX_STOP_BIT_LEN_1_5 1 | |
41 | #define TX_STOP_BIT_LEN_2 2 | |
42 | ||
43 | /* SE_UART_TX_TRANS_LEN */ | |
44 | #define TX_TRANS_LEN_MSK GENMASK(23, 0) | |
45 | ||
46 | /* SE_UART_RX_TRANS_CFG */ | |
47 | #define UART_RX_INS_STATUS_BIT BIT(2) | |
48 | #define UART_RX_PAR_EN BIT(3) | |
49 | ||
50 | /* SE_UART_RX_WORD_LEN */ | |
51 | #define RX_WORD_LEN_MASK GENMASK(9, 0) | |
52 | ||
53 | /* SE_UART_RX_STALE_CNT */ | |
54 | #define RX_STALE_CNT GENMASK(23, 0) | |
55 | ||
56 | /* SE_UART_TX_PARITY_CFG/RX_PARITY_CFG */ | |
57 | #define PAR_CALC_EN BIT(0) | |
58 | #define PAR_MODE_MSK GENMASK(2, 1) | |
59 | #define PAR_MODE_SHFT 1 | |
60 | #define PAR_EVEN 0x00 | |
61 | #define PAR_ODD 0x01 | |
62 | #define PAR_SPACE 0x10 | |
63 | #define PAR_MARK 0x11 | |
64 | ||
65 | /* UART M_CMD OP codes */ | |
66 | #define UART_START_TX 0x1 | |
67 | #define UART_START_BREAK 0x4 | |
68 | #define UART_STOP_BREAK 0x5 | |
69 | /* UART S_CMD OP codes */ | |
70 | #define UART_START_READ 0x1 | |
71 | #define UART_PARAM 0x1 | |
72 | ||
73 | #define UART_OVERSAMPLING 32 | |
74 | #define STALE_TIMEOUT 16 | |
75 | #define DEFAULT_BITS_PER_CHAR 10 | |
76 | #define GENI_UART_CONS_PORTS 1 | |
77 | #define DEF_FIFO_DEPTH_WORDS 16 | |
78 | #define DEF_TX_WM 2 | |
79 | #define DEF_FIFO_WIDTH_BITS 32 | |
80 | #define UART_CONSOLE_RX_WM 2 | |
81 | ||
82 | #ifdef CONFIG_CONSOLE_POLL | |
83 | #define RX_BYTES_PW 1 | |
84 | #else | |
85 | #define RX_BYTES_PW 4 | |
86 | #endif | |
87 | ||
88 | struct qcom_geni_serial_port { | |
89 | struct uart_port uport; | |
90 | struct geni_se se; | |
91 | char name[20]; | |
92 | u32 tx_fifo_depth; | |
93 | u32 tx_fifo_width; | |
94 | u32 rx_fifo_depth; | |
95 | u32 tx_wm; | |
96 | u32 rx_wm; | |
97 | u32 rx_rfr; | |
98 | enum geni_se_xfer_mode xfer_mode; | |
99 | bool setup; | |
100 | int (*handle_rx)(struct uart_port *uport, u32 bytes, bool drop); | |
c4f52879 KR |
101 | unsigned int baud; |
102 | unsigned int tx_bytes_pw; | |
103 | unsigned int rx_bytes_pw; | |
104 | bool brk; | |
105 | }; | |
106 | ||
f7371750 | 107 | static const struct uart_ops qcom_geni_console_pops; |
c4f52879 KR |
108 | static struct uart_driver qcom_geni_console_driver; |
109 | static int handle_rx_console(struct uart_port *uport, u32 bytes, bool drop); | |
110 | static unsigned int qcom_geni_serial_tx_empty(struct uart_port *port); | |
111 | static void qcom_geni_serial_stop_rx(struct uart_port *uport); | |
112 | ||
113 | static const unsigned long root_freq[] = {7372800, 14745600, 19200000, 29491200, | |
114 | 32000000, 48000000, 64000000, 80000000, | |
115 | 96000000, 100000000}; | |
116 | ||
117 | #define to_dev_port(ptr, member) \ | |
118 | container_of(ptr, struct qcom_geni_serial_port, member) | |
119 | ||
f7371750 KR |
120 | static struct qcom_geni_serial_port qcom_geni_console_port = { |
121 | .uport = { | |
122 | .iotype = UPIO_MEM, | |
123 | .ops = &qcom_geni_console_pops, | |
124 | .flags = UPF_BOOT_AUTOCONF, | |
125 | .line = 0, | |
126 | }, | |
127 | }; | |
c4f52879 KR |
128 | |
129 | static int qcom_geni_serial_request_port(struct uart_port *uport) | |
130 | { | |
131 | struct platform_device *pdev = to_platform_device(uport->dev); | |
132 | struct qcom_geni_serial_port *port = to_dev_port(uport, uport); | |
133 | struct resource *res; | |
134 | ||
135 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
136 | uport->membase = devm_ioremap_resource(&pdev->dev, res); | |
137 | if (IS_ERR(uport->membase)) | |
138 | return PTR_ERR(uport->membase); | |
139 | port->se.base = uport->membase; | |
140 | return 0; | |
141 | } | |
142 | ||
143 | static void qcom_geni_serial_config_port(struct uart_port *uport, int cfg_flags) | |
144 | { | |
145 | if (cfg_flags & UART_CONFIG_TYPE) { | |
146 | uport->type = PORT_MSM; | |
147 | qcom_geni_serial_request_port(uport); | |
148 | } | |
149 | } | |
150 | ||
151 | static unsigned int qcom_geni_cons_get_mctrl(struct uart_port *uport) | |
152 | { | |
153 | return TIOCM_DSR | TIOCM_CAR | TIOCM_CTS; | |
154 | } | |
155 | ||
156 | static void qcom_geni_cons_set_mctrl(struct uart_port *uport, | |
157 | unsigned int mctrl) | |
158 | { | |
159 | } | |
160 | ||
161 | static const char *qcom_geni_serial_get_type(struct uart_port *uport) | |
162 | { | |
163 | return "MSM"; | |
164 | } | |
165 | ||
166 | static struct qcom_geni_serial_port *get_port_from_line(int line) | |
167 | { | |
168 | if (line < 0 || line >= GENI_UART_CONS_PORTS) | |
169 | return ERR_PTR(-ENXIO); | |
170 | return &qcom_geni_console_port; | |
171 | } | |
172 | ||
173 | static bool qcom_geni_serial_poll_bit(struct uart_port *uport, | |
174 | int offset, int field, bool set) | |
175 | { | |
176 | u32 reg; | |
177 | struct qcom_geni_serial_port *port; | |
178 | unsigned int baud; | |
179 | unsigned int fifo_bits; | |
180 | unsigned long timeout_us = 20000; | |
181 | ||
182 | /* Ensure polling is not re-ordered before the prior writes/reads */ | |
183 | mb(); | |
184 | ||
185 | if (uport->private_data) { | |
186 | port = to_dev_port(uport, uport); | |
187 | baud = port->baud; | |
188 | if (!baud) | |
189 | baud = 115200; | |
190 | fifo_bits = port->tx_fifo_depth * port->tx_fifo_width; | |
191 | /* | |
192 | * Total polling iterations based on FIFO worth of bytes to be | |
193 | * sent at current baud. Add a little fluff to the wait. | |
194 | */ | |
195 | timeout_us = ((fifo_bits * USEC_PER_SEC) / baud) + 500; | |
196 | } | |
197 | ||
43f1831b KR |
198 | /* |
199 | * Use custom implementation instead of readl_poll_atomic since ktimer | |
200 | * is not ready at the time of early console. | |
201 | */ | |
202 | timeout_us = DIV_ROUND_UP(timeout_us, 10) * 10; | |
203 | while (timeout_us) { | |
204 | reg = readl_relaxed(uport->membase + offset); | |
205 | if ((bool)(reg & field) == set) | |
206 | return true; | |
207 | udelay(10); | |
208 | timeout_us -= 10; | |
209 | } | |
210 | return false; | |
c4f52879 KR |
211 | } |
212 | ||
213 | static void qcom_geni_serial_setup_tx(struct uart_port *uport, u32 xmit_size) | |
214 | { | |
215 | u32 m_cmd; | |
216 | ||
217 | writel_relaxed(xmit_size, uport->membase + SE_UART_TX_TRANS_LEN); | |
218 | m_cmd = UART_START_TX << M_OPCODE_SHFT; | |
219 | writel(m_cmd, uport->membase + SE_GENI_M_CMD0); | |
220 | } | |
221 | ||
222 | static void qcom_geni_serial_poll_tx_done(struct uart_port *uport) | |
223 | { | |
224 | int done; | |
225 | u32 irq_clear = M_CMD_DONE_EN; | |
226 | ||
227 | done = qcom_geni_serial_poll_bit(uport, SE_GENI_M_IRQ_STATUS, | |
228 | M_CMD_DONE_EN, true); | |
229 | if (!done) { | |
230 | writel_relaxed(M_GENI_CMD_ABORT, uport->membase + | |
231 | SE_GENI_M_CMD_CTRL_REG); | |
232 | irq_clear |= M_CMD_ABORT_EN; | |
233 | qcom_geni_serial_poll_bit(uport, SE_GENI_M_IRQ_STATUS, | |
234 | M_CMD_ABORT_EN, true); | |
235 | } | |
236 | writel_relaxed(irq_clear, uport->membase + SE_GENI_M_IRQ_CLEAR); | |
237 | } | |
238 | ||
239 | static void qcom_geni_serial_abort_rx(struct uart_port *uport) | |
240 | { | |
241 | u32 irq_clear = S_CMD_DONE_EN | S_CMD_ABORT_EN; | |
242 | ||
243 | writel(S_GENI_CMD_ABORT, uport->membase + SE_GENI_S_CMD_CTRL_REG); | |
244 | qcom_geni_serial_poll_bit(uport, SE_GENI_S_CMD_CTRL_REG, | |
245 | S_GENI_CMD_ABORT, false); | |
246 | writel_relaxed(irq_clear, uport->membase + SE_GENI_S_IRQ_CLEAR); | |
247 | writel_relaxed(FORCE_DEFAULT, uport->membase + GENI_FORCE_DEFAULT_REG); | |
248 | } | |
249 | ||
250 | #ifdef CONFIG_CONSOLE_POLL | |
251 | static int qcom_geni_serial_get_char(struct uart_port *uport) | |
252 | { | |
253 | u32 rx_fifo; | |
254 | u32 status; | |
255 | ||
256 | status = readl_relaxed(uport->membase + SE_GENI_M_IRQ_STATUS); | |
257 | writel_relaxed(status, uport->membase + SE_GENI_M_IRQ_CLEAR); | |
258 | ||
259 | status = readl_relaxed(uport->membase + SE_GENI_S_IRQ_STATUS); | |
260 | writel_relaxed(status, uport->membase + SE_GENI_S_IRQ_CLEAR); | |
261 | ||
262 | /* | |
263 | * Ensure the writes to clear interrupts is not re-ordered after | |
264 | * reading the data. | |
265 | */ | |
266 | mb(); | |
267 | ||
268 | status = readl_relaxed(uport->membase + SE_GENI_RX_FIFO_STATUS); | |
269 | if (!(status & RX_FIFO_WC_MSK)) | |
270 | return NO_POLL_CHAR; | |
271 | ||
272 | rx_fifo = readl(uport->membase + SE_GENI_RX_FIFOn); | |
273 | return rx_fifo & 0xff; | |
274 | } | |
275 | ||
276 | static void qcom_geni_serial_poll_put_char(struct uart_port *uport, | |
277 | unsigned char c) | |
278 | { | |
279 | struct qcom_geni_serial_port *port = to_dev_port(uport, uport); | |
280 | ||
281 | writel_relaxed(port->tx_wm, uport->membase + SE_GENI_TX_WATERMARK_REG); | |
282 | qcom_geni_serial_setup_tx(uport, 1); | |
283 | WARN_ON(!qcom_geni_serial_poll_bit(uport, SE_GENI_M_IRQ_STATUS, | |
284 | M_TX_FIFO_WATERMARK_EN, true)); | |
285 | writel_relaxed(c, uport->membase + SE_GENI_TX_FIFOn); | |
286 | writel_relaxed(M_TX_FIFO_WATERMARK_EN, uport->membase + | |
287 | SE_GENI_M_IRQ_CLEAR); | |
288 | qcom_geni_serial_poll_tx_done(uport); | |
289 | } | |
290 | #endif | |
291 | ||
292 | #ifdef CONFIG_SERIAL_QCOM_GENI_CONSOLE | |
293 | static void qcom_geni_serial_wr_char(struct uart_port *uport, int ch) | |
294 | { | |
295 | writel_relaxed(ch, uport->membase + SE_GENI_TX_FIFOn); | |
296 | } | |
297 | ||
298 | static void | |
299 | __qcom_geni_serial_console_write(struct uart_port *uport, const char *s, | |
300 | unsigned int count) | |
301 | { | |
302 | int i; | |
303 | u32 bytes_to_send = count; | |
304 | ||
305 | for (i = 0; i < count; i++) { | |
f0262568 KR |
306 | /* |
307 | * uart_console_write() adds a carriage return for each newline. | |
308 | * Account for additional bytes to be written. | |
309 | */ | |
c4f52879 KR |
310 | if (s[i] == '\n') |
311 | bytes_to_send++; | |
312 | } | |
313 | ||
314 | writel_relaxed(DEF_TX_WM, uport->membase + SE_GENI_TX_WATERMARK_REG); | |
315 | qcom_geni_serial_setup_tx(uport, bytes_to_send); | |
316 | for (i = 0; i < count; ) { | |
317 | size_t chars_to_write = 0; | |
318 | size_t avail = DEF_FIFO_DEPTH_WORDS - DEF_TX_WM; | |
319 | ||
320 | /* | |
321 | * If the WM bit never set, then the Tx state machine is not | |
322 | * in a valid state, so break, cancel/abort any existing | |
323 | * command. Unfortunately the current data being written is | |
324 | * lost. | |
325 | */ | |
326 | if (!qcom_geni_serial_poll_bit(uport, SE_GENI_M_IRQ_STATUS, | |
327 | M_TX_FIFO_WATERMARK_EN, true)) | |
328 | break; | |
6a10635e | 329 | chars_to_write = min_t(size_t, count - i, avail / 2); |
c4f52879 KR |
330 | uart_console_write(uport, s + i, chars_to_write, |
331 | qcom_geni_serial_wr_char); | |
332 | writel_relaxed(M_TX_FIFO_WATERMARK_EN, uport->membase + | |
333 | SE_GENI_M_IRQ_CLEAR); | |
334 | i += chars_to_write; | |
335 | } | |
336 | qcom_geni_serial_poll_tx_done(uport); | |
337 | } | |
338 | ||
339 | static void qcom_geni_serial_console_write(struct console *co, const char *s, | |
340 | unsigned int count) | |
341 | { | |
342 | struct uart_port *uport; | |
343 | struct qcom_geni_serial_port *port; | |
344 | bool locked = true; | |
345 | unsigned long flags; | |
346 | ||
347 | WARN_ON(co->index < 0 || co->index >= GENI_UART_CONS_PORTS); | |
348 | ||
349 | port = get_port_from_line(co->index); | |
350 | if (IS_ERR(port)) | |
351 | return; | |
352 | ||
353 | uport = &port->uport; | |
354 | if (oops_in_progress) | |
355 | locked = spin_trylock_irqsave(&uport->lock, flags); | |
356 | else | |
357 | spin_lock_irqsave(&uport->lock, flags); | |
358 | ||
359 | /* Cancel the current write to log the fault */ | |
360 | if (!locked) { | |
361 | geni_se_cancel_m_cmd(&port->se); | |
362 | if (!qcom_geni_serial_poll_bit(uport, SE_GENI_M_IRQ_STATUS, | |
363 | M_CMD_CANCEL_EN, true)) { | |
364 | geni_se_abort_m_cmd(&port->se); | |
365 | qcom_geni_serial_poll_bit(uport, SE_GENI_M_IRQ_STATUS, | |
366 | M_CMD_ABORT_EN, true); | |
367 | writel_relaxed(M_CMD_ABORT_EN, uport->membase + | |
368 | SE_GENI_M_IRQ_CLEAR); | |
369 | } | |
370 | writel_relaxed(M_CMD_CANCEL_EN, uport->membase + | |
371 | SE_GENI_M_IRQ_CLEAR); | |
372 | } | |
373 | ||
374 | __qcom_geni_serial_console_write(uport, s, count); | |
375 | if (locked) | |
376 | spin_unlock_irqrestore(&uport->lock, flags); | |
377 | } | |
378 | ||
379 | static int handle_rx_console(struct uart_port *uport, u32 bytes, bool drop) | |
380 | { | |
381 | u32 i; | |
382 | unsigned char buf[sizeof(u32)]; | |
383 | struct tty_port *tport; | |
384 | struct qcom_geni_serial_port *port = to_dev_port(uport, uport); | |
385 | ||
386 | tport = &uport->state->port; | |
387 | for (i = 0; i < bytes; ) { | |
388 | int c; | |
389 | int chunk = min_t(int, bytes - i, port->rx_bytes_pw); | |
390 | ||
391 | ioread32_rep(uport->membase + SE_GENI_RX_FIFOn, buf, 1); | |
392 | i += chunk; | |
393 | if (drop) | |
394 | continue; | |
395 | ||
396 | for (c = 0; c < chunk; c++) { | |
397 | int sysrq; | |
398 | ||
399 | uport->icount.rx++; | |
400 | if (port->brk && buf[c] == 0) { | |
401 | port->brk = false; | |
402 | if (uart_handle_break(uport)) | |
403 | continue; | |
404 | } | |
405 | ||
406 | sysrq = uart_handle_sysrq_char(uport, buf[c]); | |
407 | if (!sysrq) | |
408 | tty_insert_flip_char(tport, buf[c], TTY_NORMAL); | |
409 | } | |
410 | } | |
411 | if (!drop) | |
412 | tty_flip_buffer_push(tport); | |
413 | return 0; | |
414 | } | |
415 | #else | |
416 | static int handle_rx_console(struct uart_port *uport, u32 bytes, bool drop) | |
417 | { | |
418 | return -EPERM; | |
419 | } | |
420 | ||
421 | #endif /* CONFIG_SERIAL_QCOM_GENI_CONSOLE */ | |
422 | ||
423 | static void qcom_geni_serial_start_tx(struct uart_port *uport) | |
424 | { | |
425 | u32 irq_en; | |
426 | struct qcom_geni_serial_port *port = to_dev_port(uport, uport); | |
427 | u32 status; | |
428 | ||
429 | if (port->xfer_mode == GENI_SE_FIFO) { | |
7fb5b880 KR |
430 | /* |
431 | * readl ensures reading & writing of IRQ_EN register | |
432 | * is not re-ordered before checking the status of the | |
433 | * Serial Engine. | |
434 | */ | |
435 | status = readl(uport->membase + SE_GENI_STATUS); | |
c4f52879 KR |
436 | if (status & M_GENI_CMD_ACTIVE) |
437 | return; | |
438 | ||
439 | if (!qcom_geni_serial_tx_empty(uport)) | |
440 | return; | |
441 | ||
c4f52879 KR |
442 | irq_en = readl_relaxed(uport->membase + SE_GENI_M_IRQ_EN); |
443 | irq_en |= M_TX_FIFO_WATERMARK_EN | M_CMD_DONE_EN; | |
444 | ||
445 | writel_relaxed(port->tx_wm, uport->membase + | |
446 | SE_GENI_TX_WATERMARK_REG); | |
447 | writel_relaxed(irq_en, uport->membase + SE_GENI_M_IRQ_EN); | |
448 | } | |
449 | } | |
450 | ||
451 | static void qcom_geni_serial_stop_tx(struct uart_port *uport) | |
452 | { | |
453 | u32 irq_en; | |
454 | u32 status; | |
455 | struct qcom_geni_serial_port *port = to_dev_port(uport, uport); | |
456 | ||
457 | irq_en = readl_relaxed(uport->membase + SE_GENI_M_IRQ_EN); | |
458 | irq_en &= ~M_CMD_DONE_EN; | |
459 | if (port->xfer_mode == GENI_SE_FIFO) { | |
460 | irq_en &= ~M_TX_FIFO_WATERMARK_EN; | |
461 | writel_relaxed(0, uport->membase + | |
462 | SE_GENI_TX_WATERMARK_REG); | |
463 | } | |
c4f52879 KR |
464 | writel_relaxed(irq_en, uport->membase + SE_GENI_M_IRQ_EN); |
465 | status = readl_relaxed(uport->membase + SE_GENI_STATUS); | |
466 | /* Possible stop tx is called multiple times. */ | |
467 | if (!(status & M_GENI_CMD_ACTIVE)) | |
468 | return; | |
469 | ||
470 | /* | |
471 | * Ensure cancel command write is not re-ordered before checking | |
472 | * the status of the Primary Sequencer. | |
473 | */ | |
474 | mb(); | |
475 | ||
476 | geni_se_cancel_m_cmd(&port->se); | |
477 | if (!qcom_geni_serial_poll_bit(uport, SE_GENI_M_IRQ_STATUS, | |
478 | M_CMD_CANCEL_EN, true)) { | |
479 | geni_se_abort_m_cmd(&port->se); | |
480 | qcom_geni_serial_poll_bit(uport, SE_GENI_M_IRQ_STATUS, | |
481 | M_CMD_ABORT_EN, true); | |
482 | writel_relaxed(M_CMD_ABORT_EN, uport->membase + | |
483 | SE_GENI_M_IRQ_CLEAR); | |
484 | } | |
485 | writel_relaxed(M_CMD_CANCEL_EN, uport->membase + SE_GENI_M_IRQ_CLEAR); | |
486 | } | |
487 | ||
488 | static void qcom_geni_serial_start_rx(struct uart_port *uport) | |
489 | { | |
490 | u32 irq_en; | |
491 | u32 status; | |
492 | struct qcom_geni_serial_port *port = to_dev_port(uport, uport); | |
493 | ||
494 | status = readl_relaxed(uport->membase + SE_GENI_STATUS); | |
495 | if (status & S_GENI_CMD_ACTIVE) | |
496 | qcom_geni_serial_stop_rx(uport); | |
497 | ||
498 | /* | |
499 | * Ensure setup command write is not re-ordered before checking | |
500 | * the status of the Secondary Sequencer. | |
501 | */ | |
502 | mb(); | |
503 | ||
504 | geni_se_setup_s_cmd(&port->se, UART_START_READ, 0); | |
505 | ||
506 | if (port->xfer_mode == GENI_SE_FIFO) { | |
507 | irq_en = readl_relaxed(uport->membase + SE_GENI_S_IRQ_EN); | |
508 | irq_en |= S_RX_FIFO_WATERMARK_EN | S_RX_FIFO_LAST_EN; | |
509 | writel_relaxed(irq_en, uport->membase + SE_GENI_S_IRQ_EN); | |
510 | ||
511 | irq_en = readl_relaxed(uport->membase + SE_GENI_M_IRQ_EN); | |
512 | irq_en |= M_RX_FIFO_WATERMARK_EN | M_RX_FIFO_LAST_EN; | |
513 | writel_relaxed(irq_en, uport->membase + SE_GENI_M_IRQ_EN); | |
514 | } | |
515 | } | |
516 | ||
517 | static void qcom_geni_serial_stop_rx(struct uart_port *uport) | |
518 | { | |
519 | u32 irq_en; | |
520 | u32 status; | |
521 | struct qcom_geni_serial_port *port = to_dev_port(uport, uport); | |
522 | u32 irq_clear = S_CMD_DONE_EN; | |
523 | ||
524 | if (port->xfer_mode == GENI_SE_FIFO) { | |
525 | irq_en = readl_relaxed(uport->membase + SE_GENI_S_IRQ_EN); | |
526 | irq_en &= ~(S_RX_FIFO_WATERMARK_EN | S_RX_FIFO_LAST_EN); | |
527 | writel_relaxed(irq_en, uport->membase + SE_GENI_S_IRQ_EN); | |
528 | ||
529 | irq_en = readl_relaxed(uport->membase + SE_GENI_M_IRQ_EN); | |
530 | irq_en &= ~(M_RX_FIFO_WATERMARK_EN | M_RX_FIFO_LAST_EN); | |
531 | writel_relaxed(irq_en, uport->membase + SE_GENI_M_IRQ_EN); | |
532 | } | |
533 | ||
534 | status = readl_relaxed(uport->membase + SE_GENI_STATUS); | |
535 | /* Possible stop rx is called multiple times. */ | |
536 | if (!(status & S_GENI_CMD_ACTIVE)) | |
537 | return; | |
538 | ||
539 | /* | |
540 | * Ensure cancel command write is not re-ordered before checking | |
541 | * the status of the Secondary Sequencer. | |
542 | */ | |
543 | mb(); | |
544 | ||
545 | geni_se_cancel_s_cmd(&port->se); | |
546 | qcom_geni_serial_poll_bit(uport, SE_GENI_S_CMD_CTRL_REG, | |
547 | S_GENI_CMD_CANCEL, false); | |
548 | status = readl_relaxed(uport->membase + SE_GENI_STATUS); | |
549 | writel_relaxed(irq_clear, uport->membase + SE_GENI_S_IRQ_CLEAR); | |
550 | if (status & S_GENI_CMD_ACTIVE) | |
551 | qcom_geni_serial_abort_rx(uport); | |
552 | } | |
553 | ||
554 | static void qcom_geni_serial_handle_rx(struct uart_port *uport, bool drop) | |
555 | { | |
556 | u32 status; | |
557 | u32 word_cnt; | |
558 | u32 last_word_byte_cnt; | |
559 | u32 last_word_partial; | |
560 | u32 total_bytes; | |
561 | struct qcom_geni_serial_port *port = to_dev_port(uport, uport); | |
562 | ||
563 | status = readl_relaxed(uport->membase + SE_GENI_RX_FIFO_STATUS); | |
564 | word_cnt = status & RX_FIFO_WC_MSK; | |
565 | last_word_partial = status & RX_LAST; | |
566 | last_word_byte_cnt = (status & RX_LAST_BYTE_VALID_MSK) >> | |
567 | RX_LAST_BYTE_VALID_SHFT; | |
568 | ||
569 | if (!word_cnt) | |
570 | return; | |
571 | total_bytes = port->rx_bytes_pw * (word_cnt - 1); | |
572 | if (last_word_partial && last_word_byte_cnt) | |
573 | total_bytes += last_word_byte_cnt; | |
574 | else | |
575 | total_bytes += port->rx_bytes_pw; | |
576 | port->handle_rx(uport, total_bytes, drop); | |
577 | } | |
578 | ||
579 | static void qcom_geni_serial_handle_tx(struct uart_port *uport) | |
580 | { | |
581 | struct qcom_geni_serial_port *port = to_dev_port(uport, uport); | |
582 | struct circ_buf *xmit = &uport->state->xmit; | |
583 | size_t avail; | |
584 | size_t remaining; | |
585 | int i; | |
586 | u32 status; | |
587 | unsigned int chunk; | |
588 | int tail; | |
589 | ||
590 | chunk = uart_circ_chars_pending(xmit); | |
591 | status = readl_relaxed(uport->membase + SE_GENI_TX_FIFO_STATUS); | |
592 | /* Both FIFO and framework buffer are drained */ | |
638a6f4e | 593 | if (!chunk && !status) { |
c4f52879 KR |
594 | qcom_geni_serial_stop_tx(uport); |
595 | goto out_write_wakeup; | |
596 | } | |
c4f52879 KR |
597 | |
598 | avail = (port->tx_fifo_depth - port->tx_wm) * port->tx_bytes_pw; | |
638a6f4e | 599 | tail = xmit->tail; |
8e70c47c | 600 | chunk = min3((size_t)chunk, (size_t)(UART_XMIT_SIZE - tail), avail); |
c4f52879 KR |
601 | if (!chunk) |
602 | goto out_write_wakeup; | |
603 | ||
604 | qcom_geni_serial_setup_tx(uport, chunk); | |
605 | ||
606 | remaining = chunk; | |
607 | for (i = 0; i < chunk; ) { | |
608 | unsigned int tx_bytes; | |
69736b57 | 609 | u8 buf[sizeof(u32)]; |
c4f52879 KR |
610 | int c; |
611 | ||
69736b57 | 612 | memset(buf, 0, ARRAY_SIZE(buf)); |
6a10635e | 613 | tx_bytes = min_t(size_t, remaining, port->tx_bytes_pw); |
c4f52879 | 614 | for (c = 0; c < tx_bytes ; c++) |
69736b57 | 615 | buf[c] = xmit->buf[tail + c]; |
c4f52879 | 616 | |
69736b57 | 617 | iowrite32_rep(uport->membase + SE_GENI_TX_FIFOn, buf, 1); |
c4f52879 KR |
618 | |
619 | i += tx_bytes; | |
638a6f4e | 620 | tail += tx_bytes; |
c4f52879 KR |
621 | uport->icount.tx += tx_bytes; |
622 | remaining -= tx_bytes; | |
623 | } | |
638a6f4e EG |
624 | |
625 | xmit->tail = tail & (UART_XMIT_SIZE - 1); | |
c4f52879 | 626 | qcom_geni_serial_poll_tx_done(uport); |
c4f52879 | 627 | out_write_wakeup: |
638a6f4e EG |
628 | if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) |
629 | uart_write_wakeup(uport); | |
c4f52879 KR |
630 | } |
631 | ||
632 | static irqreturn_t qcom_geni_serial_isr(int isr, void *dev) | |
633 | { | |
634 | unsigned int m_irq_status; | |
635 | unsigned int s_irq_status; | |
636 | struct uart_port *uport = dev; | |
637 | unsigned long flags; | |
638 | unsigned int m_irq_en; | |
639 | bool drop_rx = false; | |
640 | struct tty_port *tport = &uport->state->port; | |
641 | struct qcom_geni_serial_port *port = to_dev_port(uport, uport); | |
642 | ||
643 | if (uport->suspended) | |
ec91df8d | 644 | return IRQ_NONE; |
c4f52879 KR |
645 | |
646 | spin_lock_irqsave(&uport->lock, flags); | |
647 | m_irq_status = readl_relaxed(uport->membase + SE_GENI_M_IRQ_STATUS); | |
648 | s_irq_status = readl_relaxed(uport->membase + SE_GENI_S_IRQ_STATUS); | |
649 | m_irq_en = readl_relaxed(uport->membase + SE_GENI_M_IRQ_EN); | |
650 | writel_relaxed(m_irq_status, uport->membase + SE_GENI_M_IRQ_CLEAR); | |
651 | writel_relaxed(s_irq_status, uport->membase + SE_GENI_S_IRQ_CLEAR); | |
652 | ||
653 | if (WARN_ON(m_irq_status & M_ILLEGAL_CMD_EN)) | |
654 | goto out_unlock; | |
655 | ||
656 | if (s_irq_status & S_RX_FIFO_WR_ERR_EN) { | |
657 | uport->icount.overrun++; | |
658 | tty_insert_flip_char(tport, 0, TTY_OVERRUN); | |
659 | } | |
660 | ||
661 | if (m_irq_status & (M_TX_FIFO_WATERMARK_EN | M_CMD_DONE_EN) && | |
662 | m_irq_en & (M_TX_FIFO_WATERMARK_EN | M_CMD_DONE_EN)) | |
663 | qcom_geni_serial_handle_tx(uport); | |
664 | ||
665 | if (s_irq_status & S_GP_IRQ_0_EN || s_irq_status & S_GP_IRQ_1_EN) { | |
666 | if (s_irq_status & S_GP_IRQ_0_EN) | |
667 | uport->icount.parity++; | |
668 | drop_rx = true; | |
669 | } else if (s_irq_status & S_GP_IRQ_2_EN || | |
670 | s_irq_status & S_GP_IRQ_3_EN) { | |
671 | uport->icount.brk++; | |
672 | port->brk = true; | |
673 | } | |
674 | ||
675 | if (s_irq_status & S_RX_FIFO_WATERMARK_EN || | |
676 | s_irq_status & S_RX_FIFO_LAST_EN) | |
677 | qcom_geni_serial_handle_rx(uport, drop_rx); | |
678 | ||
679 | out_unlock: | |
680 | spin_unlock_irqrestore(&uport->lock, flags); | |
681 | return IRQ_HANDLED; | |
682 | } | |
683 | ||
6a10635e | 684 | static void get_tx_fifo_size(struct qcom_geni_serial_port *port) |
c4f52879 KR |
685 | { |
686 | struct uart_port *uport; | |
687 | ||
c4f52879 KR |
688 | uport = &port->uport; |
689 | port->tx_fifo_depth = geni_se_get_tx_fifo_depth(&port->se); | |
690 | port->tx_fifo_width = geni_se_get_tx_fifo_width(&port->se); | |
691 | port->rx_fifo_depth = geni_se_get_rx_fifo_depth(&port->se); | |
692 | uport->fifosize = | |
693 | (port->tx_fifo_depth * port->tx_fifo_width) / BITS_PER_BYTE; | |
c4f52879 KR |
694 | } |
695 | ||
696 | static void set_rfr_wm(struct qcom_geni_serial_port *port) | |
697 | { | |
698 | /* | |
699 | * Set RFR (Flow off) to FIFO_DEPTH - 2. | |
700 | * RX WM level at 10% RX_FIFO_DEPTH. | |
701 | * TX WM level at 10% TX_FIFO_DEPTH. | |
702 | */ | |
703 | port->rx_rfr = port->rx_fifo_depth - 2; | |
704 | port->rx_wm = UART_CONSOLE_RX_WM; | |
705 | port->tx_wm = DEF_TX_WM; | |
706 | } | |
707 | ||
708 | static void qcom_geni_serial_shutdown(struct uart_port *uport) | |
709 | { | |
710 | unsigned long flags; | |
711 | ||
712 | /* Stop the console before stopping the current tx */ | |
713 | console_stop(uport->cons); | |
714 | ||
c4f52879 KR |
715 | free_irq(uport->irq, uport); |
716 | spin_lock_irqsave(&uport->lock, flags); | |
717 | qcom_geni_serial_stop_tx(uport); | |
718 | qcom_geni_serial_stop_rx(uport); | |
719 | spin_unlock_irqrestore(&uport->lock, flags); | |
720 | } | |
721 | ||
722 | static int qcom_geni_serial_port_setup(struct uart_port *uport) | |
723 | { | |
724 | struct qcom_geni_serial_port *port = to_dev_port(uport, uport); | |
725 | unsigned int rxstale = DEFAULT_BITS_PER_CHAR * STALE_TIMEOUT; | |
726 | ||
727 | set_rfr_wm(port); | |
728 | writel_relaxed(rxstale, uport->membase + SE_UART_RX_STALE_CNT); | |
729 | /* | |
730 | * Make an unconditional cancel on the main sequencer to reset | |
731 | * it else we could end up in data loss scenarios. | |
732 | */ | |
733 | port->xfer_mode = GENI_SE_FIFO; | |
734 | qcom_geni_serial_poll_tx_done(uport); | |
735 | geni_se_config_packing(&port->se, BITS_PER_BYTE, port->tx_bytes_pw, | |
736 | false, true, false); | |
737 | geni_se_config_packing(&port->se, BITS_PER_BYTE, port->rx_bytes_pw, | |
738 | false, false, true); | |
739 | geni_se_init(&port->se, port->rx_wm, port->rx_rfr); | |
740 | geni_se_select_mode(&port->se, port->xfer_mode); | |
741 | port->setup = true; | |
742 | return 0; | |
743 | } | |
744 | ||
745 | static int qcom_geni_serial_startup(struct uart_port *uport) | |
746 | { | |
747 | int ret; | |
748 | u32 proto; | |
749 | struct qcom_geni_serial_port *port = to_dev_port(uport, uport); | |
750 | ||
751 | scnprintf(port->name, sizeof(port->name), | |
752 | "qcom_serial_geni%d", uport->line); | |
753 | ||
754 | proto = geni_se_read_proto(&port->se); | |
755 | if (proto != GENI_SE_UART) { | |
756 | dev_err(uport->dev, "Invalid FW loaded, proto: %d\n", proto); | |
757 | return -ENXIO; | |
758 | } | |
759 | ||
760 | get_tx_fifo_size(port); | |
761 | if (!port->setup) { | |
762 | ret = qcom_geni_serial_port_setup(uport); | |
763 | if (ret) | |
764 | return ret; | |
765 | } | |
766 | ||
767 | ret = request_irq(uport->irq, qcom_geni_serial_isr, IRQF_TRIGGER_HIGH, | |
768 | port->name, uport); | |
769 | if (ret) | |
770 | dev_err(uport->dev, "Failed to get IRQ ret %d\n", ret); | |
771 | return ret; | |
772 | } | |
773 | ||
774 | static unsigned long get_clk_cfg(unsigned long clk_freq) | |
775 | { | |
776 | int i; | |
777 | ||
778 | for (i = 0; i < ARRAY_SIZE(root_freq); i++) { | |
779 | if (!(root_freq[i] % clk_freq)) | |
780 | return root_freq[i]; | |
781 | } | |
782 | return 0; | |
783 | } | |
784 | ||
785 | static unsigned long get_clk_div_rate(unsigned int baud, unsigned int *clk_div) | |
786 | { | |
787 | unsigned long ser_clk; | |
788 | unsigned long desired_clk; | |
789 | ||
790 | desired_clk = baud * UART_OVERSAMPLING; | |
791 | ser_clk = get_clk_cfg(desired_clk); | |
792 | if (!ser_clk) { | |
793 | pr_err("%s: Can't find matching DFS entry for baud %d\n", | |
794 | __func__, baud); | |
795 | return ser_clk; | |
796 | } | |
797 | ||
798 | *clk_div = ser_clk / desired_clk; | |
799 | return ser_clk; | |
800 | } | |
801 | ||
802 | static void qcom_geni_serial_set_termios(struct uart_port *uport, | |
803 | struct ktermios *termios, struct ktermios *old) | |
804 | { | |
805 | unsigned int baud; | |
806 | unsigned int bits_per_char; | |
807 | unsigned int tx_trans_cfg; | |
808 | unsigned int tx_parity_cfg; | |
809 | unsigned int rx_trans_cfg; | |
810 | unsigned int rx_parity_cfg; | |
811 | unsigned int stop_bit_len; | |
812 | unsigned int clk_div; | |
813 | unsigned long ser_clk_cfg; | |
814 | struct qcom_geni_serial_port *port = to_dev_port(uport, uport); | |
815 | unsigned long clk_rate; | |
816 | ||
817 | qcom_geni_serial_stop_rx(uport); | |
818 | /* baud rate */ | |
819 | baud = uart_get_baud_rate(uport, termios, old, 300, 4000000); | |
820 | port->baud = baud; | |
821 | clk_rate = get_clk_div_rate(baud, &clk_div); | |
822 | if (!clk_rate) | |
823 | goto out_restart_rx; | |
824 | ||
825 | uport->uartclk = clk_rate; | |
826 | clk_set_rate(port->se.clk, clk_rate); | |
827 | ser_clk_cfg = SER_CLK_EN; | |
828 | ser_clk_cfg |= clk_div << CLK_DIV_SHFT; | |
829 | ||
830 | /* parity */ | |
831 | tx_trans_cfg = readl_relaxed(uport->membase + SE_UART_TX_TRANS_CFG); | |
832 | tx_parity_cfg = readl_relaxed(uport->membase + SE_UART_TX_PARITY_CFG); | |
833 | rx_trans_cfg = readl_relaxed(uport->membase + SE_UART_RX_TRANS_CFG); | |
834 | rx_parity_cfg = readl_relaxed(uport->membase + SE_UART_RX_PARITY_CFG); | |
835 | if (termios->c_cflag & PARENB) { | |
836 | tx_trans_cfg |= UART_TX_PAR_EN; | |
837 | rx_trans_cfg |= UART_RX_PAR_EN; | |
838 | tx_parity_cfg |= PAR_CALC_EN; | |
839 | rx_parity_cfg |= PAR_CALC_EN; | |
840 | if (termios->c_cflag & PARODD) { | |
841 | tx_parity_cfg |= PAR_ODD; | |
842 | rx_parity_cfg |= PAR_ODD; | |
843 | } else if (termios->c_cflag & CMSPAR) { | |
844 | tx_parity_cfg |= PAR_SPACE; | |
845 | rx_parity_cfg |= PAR_SPACE; | |
846 | } else { | |
847 | tx_parity_cfg |= PAR_EVEN; | |
848 | rx_parity_cfg |= PAR_EVEN; | |
849 | } | |
850 | } else { | |
851 | tx_trans_cfg &= ~UART_TX_PAR_EN; | |
852 | rx_trans_cfg &= ~UART_RX_PAR_EN; | |
853 | tx_parity_cfg &= ~PAR_CALC_EN; | |
854 | rx_parity_cfg &= ~PAR_CALC_EN; | |
855 | } | |
856 | ||
857 | /* bits per char */ | |
858 | switch (termios->c_cflag & CSIZE) { | |
859 | case CS5: | |
860 | bits_per_char = 5; | |
861 | break; | |
862 | case CS6: | |
863 | bits_per_char = 6; | |
864 | break; | |
865 | case CS7: | |
866 | bits_per_char = 7; | |
867 | break; | |
868 | case CS8: | |
869 | default: | |
870 | bits_per_char = 8; | |
871 | break; | |
872 | } | |
873 | ||
874 | /* stop bits */ | |
875 | if (termios->c_cflag & CSTOPB) | |
876 | stop_bit_len = TX_STOP_BIT_LEN_2; | |
877 | else | |
878 | stop_bit_len = TX_STOP_BIT_LEN_1; | |
879 | ||
880 | /* flow control, clear the CTS_MASK bit if using flow control. */ | |
881 | if (termios->c_cflag & CRTSCTS) | |
882 | tx_trans_cfg &= ~UART_CTS_MASK; | |
883 | else | |
884 | tx_trans_cfg |= UART_CTS_MASK; | |
885 | ||
886 | if (baud) | |
887 | uart_update_timeout(uport, termios->c_cflag, baud); | |
888 | ||
889 | writel_relaxed(tx_trans_cfg, uport->membase + SE_UART_TX_TRANS_CFG); | |
890 | writel_relaxed(tx_parity_cfg, uport->membase + SE_UART_TX_PARITY_CFG); | |
891 | writel_relaxed(rx_trans_cfg, uport->membase + SE_UART_RX_TRANS_CFG); | |
892 | writel_relaxed(rx_parity_cfg, uport->membase + SE_UART_RX_PARITY_CFG); | |
893 | writel_relaxed(bits_per_char, uport->membase + SE_UART_TX_WORD_LEN); | |
894 | writel_relaxed(bits_per_char, uport->membase + SE_UART_RX_WORD_LEN); | |
895 | writel_relaxed(stop_bit_len, uport->membase + SE_UART_TX_STOP_BIT_LEN); | |
896 | writel_relaxed(ser_clk_cfg, uport->membase + GENI_SER_M_CLK_CFG); | |
897 | writel_relaxed(ser_clk_cfg, uport->membase + GENI_SER_S_CLK_CFG); | |
898 | out_restart_rx: | |
899 | qcom_geni_serial_start_rx(uport); | |
900 | } | |
901 | ||
902 | static unsigned int qcom_geni_serial_tx_empty(struct uart_port *uport) | |
903 | { | |
7fb5b880 | 904 | return !readl(uport->membase + SE_GENI_TX_FIFO_STATUS); |
c4f52879 KR |
905 | } |
906 | ||
907 | #ifdef CONFIG_SERIAL_QCOM_GENI_CONSOLE | |
908 | static int __init qcom_geni_console_setup(struct console *co, char *options) | |
909 | { | |
910 | struct uart_port *uport; | |
911 | struct qcom_geni_serial_port *port; | |
912 | int baud; | |
913 | int bits = 8; | |
914 | int parity = 'n'; | |
915 | int flow = 'n'; | |
916 | ||
917 | if (co->index >= GENI_UART_CONS_PORTS || co->index < 0) | |
918 | return -ENXIO; | |
919 | ||
920 | port = get_port_from_line(co->index); | |
921 | if (IS_ERR(port)) { | |
6a10635e | 922 | pr_err("Invalid line %d\n", co->index); |
c4f52879 KR |
923 | return PTR_ERR(port); |
924 | } | |
925 | ||
926 | uport = &port->uport; | |
927 | ||
928 | if (unlikely(!uport->membase)) | |
929 | return -ENXIO; | |
930 | ||
931 | if (geni_se_resources_on(&port->se)) { | |
932 | dev_err(port->se.dev, "Error turning on resources\n"); | |
933 | return -ENXIO; | |
934 | } | |
935 | ||
936 | if (unlikely(geni_se_read_proto(&port->se) != GENI_SE_UART)) { | |
937 | geni_se_resources_off(&port->se); | |
938 | return -ENXIO; | |
939 | } | |
940 | ||
941 | if (!port->setup) { | |
942 | port->tx_bytes_pw = 1; | |
943 | port->rx_bytes_pw = RX_BYTES_PW; | |
944 | qcom_geni_serial_stop_rx(uport); | |
945 | qcom_geni_serial_port_setup(uport); | |
946 | } | |
947 | ||
948 | if (options) | |
949 | uart_parse_options(options, &baud, &parity, &bits, &flow); | |
950 | ||
951 | return uart_set_options(uport, co, baud, parity, bits, flow); | |
952 | } | |
953 | ||
43f1831b KR |
954 | static void qcom_geni_serial_earlycon_write(struct console *con, |
955 | const char *s, unsigned int n) | |
956 | { | |
957 | struct earlycon_device *dev = con->data; | |
958 | ||
959 | __qcom_geni_serial_console_write(&dev->port, s, n); | |
960 | } | |
961 | ||
962 | static int __init qcom_geni_serial_earlycon_setup(struct earlycon_device *dev, | |
963 | const char *opt) | |
964 | { | |
965 | struct uart_port *uport = &dev->port; | |
966 | u32 tx_trans_cfg; | |
967 | u32 tx_parity_cfg = 0; /* Disable Tx Parity */ | |
968 | u32 rx_trans_cfg = 0; | |
969 | u32 rx_parity_cfg = 0; /* Disable Rx Parity */ | |
970 | u32 stop_bit_len = 0; /* Default stop bit length - 1 bit */ | |
971 | u32 bits_per_char; | |
972 | struct geni_se se; | |
973 | ||
974 | if (!uport->membase) | |
975 | return -EINVAL; | |
976 | ||
977 | memset(&se, 0, sizeof(se)); | |
978 | se.base = uport->membase; | |
979 | if (geni_se_read_proto(&se) != GENI_SE_UART) | |
980 | return -ENXIO; | |
981 | /* | |
982 | * Ignore Flow control. | |
983 | * n = 8. | |
984 | */ | |
985 | tx_trans_cfg = UART_CTS_MASK; | |
986 | bits_per_char = BITS_PER_BYTE; | |
987 | ||
988 | /* | |
989 | * Make an unconditional cancel on the main sequencer to reset | |
990 | * it else we could end up in data loss scenarios. | |
991 | */ | |
992 | qcom_geni_serial_poll_tx_done(uport); | |
993 | qcom_geni_serial_abort_rx(uport); | |
994 | geni_se_config_packing(&se, BITS_PER_BYTE, 1, false, true, false); | |
995 | geni_se_init(&se, DEF_FIFO_DEPTH_WORDS / 2, DEF_FIFO_DEPTH_WORDS - 2); | |
996 | geni_se_select_mode(&se, GENI_SE_FIFO); | |
997 | ||
998 | writel_relaxed(tx_trans_cfg, uport->membase + SE_UART_TX_TRANS_CFG); | |
999 | writel_relaxed(tx_parity_cfg, uport->membase + SE_UART_TX_PARITY_CFG); | |
1000 | writel_relaxed(rx_trans_cfg, uport->membase + SE_UART_RX_TRANS_CFG); | |
1001 | writel_relaxed(rx_parity_cfg, uport->membase + SE_UART_RX_PARITY_CFG); | |
1002 | writel_relaxed(bits_per_char, uport->membase + SE_UART_TX_WORD_LEN); | |
1003 | writel_relaxed(bits_per_char, uport->membase + SE_UART_RX_WORD_LEN); | |
1004 | writel_relaxed(stop_bit_len, uport->membase + SE_UART_TX_STOP_BIT_LEN); | |
1005 | ||
1006 | dev->con->write = qcom_geni_serial_earlycon_write; | |
1007 | dev->con->setup = NULL; | |
1008 | return 0; | |
1009 | } | |
1010 | OF_EARLYCON_DECLARE(qcom_geni, "qcom,geni-debug-uart", | |
1011 | qcom_geni_serial_earlycon_setup); | |
1012 | ||
c4f52879 KR |
1013 | static int __init console_register(struct uart_driver *drv) |
1014 | { | |
1015 | return uart_register_driver(drv); | |
1016 | } | |
1017 | ||
1018 | static void console_unregister(struct uart_driver *drv) | |
1019 | { | |
1020 | uart_unregister_driver(drv); | |
1021 | } | |
1022 | ||
1023 | static struct console cons_ops = { | |
1024 | .name = "ttyMSM", | |
1025 | .write = qcom_geni_serial_console_write, | |
1026 | .device = uart_console_device, | |
1027 | .setup = qcom_geni_console_setup, | |
1028 | .flags = CON_PRINTBUFFER, | |
1029 | .index = -1, | |
1030 | .data = &qcom_geni_console_driver, | |
1031 | }; | |
1032 | ||
1033 | static struct uart_driver qcom_geni_console_driver = { | |
1034 | .owner = THIS_MODULE, | |
1035 | .driver_name = "qcom_geni_console", | |
1036 | .dev_name = "ttyMSM", | |
1037 | .nr = GENI_UART_CONS_PORTS, | |
1038 | .cons = &cons_ops, | |
1039 | }; | |
1040 | #else | |
1041 | static int console_register(struct uart_driver *drv) | |
1042 | { | |
1043 | return 0; | |
1044 | } | |
1045 | ||
1046 | static void console_unregister(struct uart_driver *drv) | |
1047 | { | |
1048 | } | |
1049 | #endif /* CONFIG_SERIAL_QCOM_GENI_CONSOLE */ | |
1050 | ||
1051 | static void qcom_geni_serial_cons_pm(struct uart_port *uport, | |
1052 | unsigned int new_state, unsigned int old_state) | |
1053 | { | |
1054 | struct qcom_geni_serial_port *port = to_dev_port(uport, uport); | |
1055 | ||
1056 | if (unlikely(!uart_console(uport))) | |
1057 | return; | |
1058 | ||
1059 | if (new_state == UART_PM_STATE_ON && old_state == UART_PM_STATE_OFF) | |
1060 | geni_se_resources_on(&port->se); | |
1061 | else if (new_state == UART_PM_STATE_OFF && | |
1062 | old_state == UART_PM_STATE_ON) | |
1063 | geni_se_resources_off(&port->se); | |
1064 | } | |
1065 | ||
1066 | static const struct uart_ops qcom_geni_console_pops = { | |
1067 | .tx_empty = qcom_geni_serial_tx_empty, | |
1068 | .stop_tx = qcom_geni_serial_stop_tx, | |
1069 | .start_tx = qcom_geni_serial_start_tx, | |
1070 | .stop_rx = qcom_geni_serial_stop_rx, | |
1071 | .set_termios = qcom_geni_serial_set_termios, | |
1072 | .startup = qcom_geni_serial_startup, | |
1073 | .request_port = qcom_geni_serial_request_port, | |
1074 | .config_port = qcom_geni_serial_config_port, | |
1075 | .shutdown = qcom_geni_serial_shutdown, | |
1076 | .type = qcom_geni_serial_get_type, | |
1077 | .set_mctrl = qcom_geni_cons_set_mctrl, | |
1078 | .get_mctrl = qcom_geni_cons_get_mctrl, | |
1079 | #ifdef CONFIG_CONSOLE_POLL | |
1080 | .poll_get_char = qcom_geni_serial_get_char, | |
1081 | .poll_put_char = qcom_geni_serial_poll_put_char, | |
1082 | #endif | |
1083 | .pm = qcom_geni_serial_cons_pm, | |
1084 | }; | |
1085 | ||
1086 | static int qcom_geni_serial_probe(struct platform_device *pdev) | |
1087 | { | |
1088 | int ret = 0; | |
1089 | int line = -1; | |
1090 | struct qcom_geni_serial_port *port; | |
1091 | struct uart_port *uport; | |
1092 | struct resource *res; | |
066cd1c4 | 1093 | int irq; |
c4f52879 KR |
1094 | |
1095 | if (pdev->dev.of_node) | |
1096 | line = of_alias_get_id(pdev->dev.of_node, "serial"); | |
c4f52879 KR |
1097 | |
1098 | if (line < 0 || line >= GENI_UART_CONS_PORTS) | |
1099 | return -ENXIO; | |
1100 | port = get_port_from_line(line); | |
1101 | if (IS_ERR(port)) { | |
6a10635e KR |
1102 | dev_err(&pdev->dev, "Invalid line %d\n", line); |
1103 | return PTR_ERR(port); | |
c4f52879 KR |
1104 | } |
1105 | ||
1106 | uport = &port->uport; | |
1107 | /* Don't allow 2 drivers to access the same port */ | |
1108 | if (uport->private_data) | |
1109 | return -ENODEV; | |
1110 | ||
1111 | uport->dev = &pdev->dev; | |
1112 | port->se.dev = &pdev->dev; | |
1113 | port->se.wrapper = dev_get_drvdata(pdev->dev.parent); | |
1114 | port->se.clk = devm_clk_get(&pdev->dev, "se"); | |
1115 | if (IS_ERR(port->se.clk)) { | |
1116 | ret = PTR_ERR(port->se.clk); | |
1117 | dev_err(&pdev->dev, "Err getting SE Core clk %d\n", ret); | |
1118 | return ret; | |
1119 | } | |
1120 | ||
1121 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
7693b331 WY |
1122 | if (!res) |
1123 | return -EINVAL; | |
c4f52879 KR |
1124 | uport->mapbase = res->start; |
1125 | ||
1126 | port->tx_fifo_depth = DEF_FIFO_DEPTH_WORDS; | |
1127 | port->rx_fifo_depth = DEF_FIFO_DEPTH_WORDS; | |
1128 | port->tx_fifo_width = DEF_FIFO_WIDTH_BITS; | |
1129 | ||
066cd1c4 KR |
1130 | irq = platform_get_irq(pdev, 0); |
1131 | if (irq < 0) { | |
1132 | dev_err(&pdev->dev, "Failed to get IRQ %d\n", irq); | |
1133 | return irq; | |
c4f52879 | 1134 | } |
066cd1c4 | 1135 | uport->irq = irq; |
c4f52879 KR |
1136 | |
1137 | uport->private_data = &qcom_geni_console_driver; | |
1138 | platform_set_drvdata(pdev, port); | |
1139 | port->handle_rx = handle_rx_console; | |
c4f52879 KR |
1140 | return uart_add_one_port(&qcom_geni_console_driver, uport); |
1141 | } | |
1142 | ||
1143 | static int qcom_geni_serial_remove(struct platform_device *pdev) | |
1144 | { | |
1145 | struct qcom_geni_serial_port *port = platform_get_drvdata(pdev); | |
1146 | struct uart_driver *drv = port->uport.private_data; | |
1147 | ||
1148 | uart_remove_one_port(drv, &port->uport); | |
1149 | return 0; | |
1150 | } | |
1151 | ||
1152 | static int __maybe_unused qcom_geni_serial_sys_suspend_noirq(struct device *dev) | |
1153 | { | |
a406c4b8 | 1154 | struct qcom_geni_serial_port *port = dev_get_drvdata(dev); |
c4f52879 KR |
1155 | struct uart_port *uport = &port->uport; |
1156 | ||
1157 | uart_suspend_port(uport->private_data, uport); | |
1158 | return 0; | |
1159 | } | |
1160 | ||
1161 | static int __maybe_unused qcom_geni_serial_sys_resume_noirq(struct device *dev) | |
1162 | { | |
a406c4b8 | 1163 | struct qcom_geni_serial_port *port = dev_get_drvdata(dev); |
c4f52879 KR |
1164 | struct uart_port *uport = &port->uport; |
1165 | ||
1166 | if (console_suspend_enabled && uport->suspended) { | |
1167 | uart_resume_port(uport->private_data, uport); | |
f0262568 KR |
1168 | /* |
1169 | * uart_suspend_port() invokes port shutdown which in turn | |
1170 | * frees the irq. uart_resume_port invokes port startup which | |
1171 | * performs request_irq. The request_irq auto-enables the IRQ. | |
1172 | * In addition, resume_noirq implicitly enables the IRQ and | |
1173 | * leads to an unbalanced IRQ enable warning. Disable the IRQ | |
1174 | * before returning so that the warning is suppressed. | |
1175 | */ | |
c4f52879 KR |
1176 | disable_irq(uport->irq); |
1177 | } | |
1178 | return 0; | |
1179 | } | |
1180 | ||
1181 | static const struct dev_pm_ops qcom_geni_serial_pm_ops = { | |
1182 | SET_NOIRQ_SYSTEM_SLEEP_PM_OPS(qcom_geni_serial_sys_suspend_noirq, | |
1183 | qcom_geni_serial_sys_resume_noirq) | |
1184 | }; | |
1185 | ||
1186 | static const struct of_device_id qcom_geni_serial_match_table[] = { | |
1187 | { .compatible = "qcom,geni-debug-uart", }, | |
1188 | {} | |
1189 | }; | |
1190 | MODULE_DEVICE_TABLE(of, qcom_geni_serial_match_table); | |
1191 | ||
1192 | static struct platform_driver qcom_geni_serial_platform_driver = { | |
1193 | .remove = qcom_geni_serial_remove, | |
1194 | .probe = qcom_geni_serial_probe, | |
1195 | .driver = { | |
1196 | .name = "qcom_geni_serial", | |
1197 | .of_match_table = qcom_geni_serial_match_table, | |
1198 | .pm = &qcom_geni_serial_pm_ops, | |
1199 | }, | |
1200 | }; | |
1201 | ||
1202 | static int __init qcom_geni_serial_init(void) | |
1203 | { | |
1204 | int ret; | |
1205 | ||
c4f52879 KR |
1206 | ret = console_register(&qcom_geni_console_driver); |
1207 | if (ret) | |
1208 | return ret; | |
1209 | ||
1210 | ret = platform_driver_register(&qcom_geni_serial_platform_driver); | |
1211 | if (ret) | |
1212 | console_unregister(&qcom_geni_console_driver); | |
1213 | return ret; | |
1214 | } | |
1215 | module_init(qcom_geni_serial_init); | |
1216 | ||
1217 | static void __exit qcom_geni_serial_exit(void) | |
1218 | { | |
1219 | platform_driver_unregister(&qcom_geni_serial_platform_driver); | |
1220 | console_unregister(&qcom_geni_console_driver); | |
1221 | } | |
1222 | module_exit(qcom_geni_serial_exit); | |
1223 | ||
1224 | MODULE_DESCRIPTION("Serial driver for GENI based QUP cores"); | |
1225 | MODULE_LICENSE("GPL v2"); |