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Commit | Line | Data |
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d843fc6e FT |
1 | /* |
2 | * mfd.c: driver for High Speed UART device of Intel Medfield platform | |
3 | * | |
4 | * Refer pxa.c, 8250.c and some other drivers in drivers/serial/ | |
5 | * | |
06c77e21 | 6 | * (C) Copyright 2010 Intel Corporation |
d843fc6e FT |
7 | * |
8 | * This program is free software; you can redistribute it and/or | |
9 | * modify it under the terms of the GNU General Public License | |
10 | * as published by the Free Software Foundation; version 2 | |
11 | * of the License. | |
12 | */ | |
13 | ||
d843fc6e | 14 | /* Notes: |
06c77e21 FT |
15 | * 1. DMA channel allocation: 0/1 channel are assigned to port 0, |
16 | * 2/3 chan to port 1, 4/5 chan to port 3. Even number chans | |
17 | * are used for RX, odd chans for TX | |
d843fc6e | 18 | * |
06c77e21 | 19 | * 2. In A0 stepping, UART will not support TX half empty flag |
d843fc6e | 20 | * |
06c77e21 FT |
21 | * 3. The RI/DSR/DCD/DTR are not pinned out, DCD & DSR are always |
22 | * asserted, only when the HW is reset the DDCD and DDSR will | |
23 | * be triggered | |
d843fc6e FT |
24 | */ |
25 | ||
26 | #include <linux/module.h> | |
27 | #include <linux/init.h> | |
28 | #include <linux/console.h> | |
29 | #include <linux/sysrq.h> | |
63d66cab | 30 | #include <linux/slab.h> |
d843fc6e FT |
31 | #include <linux/serial_reg.h> |
32 | #include <linux/circ_buf.h> | |
33 | #include <linux/delay.h> | |
34 | #include <linux/interrupt.h> | |
35 | #include <linux/tty.h> | |
36 | #include <linux/tty_flip.h> | |
37 | #include <linux/serial_core.h> | |
38 | #include <linux/serial_mfd.h> | |
39 | #include <linux/dma-mapping.h> | |
40 | #include <linux/pci.h> | |
41 | #include <linux/io.h> | |
42 | #include <linux/debugfs.h> | |
43 | ||
44 | #define MFD_HSU_A0_STEPPING 1 | |
45 | ||
46 | #define HSU_DMA_BUF_SIZE 2048 | |
47 | ||
48 | #define chan_readl(chan, offset) readl(chan->reg + offset) | |
49 | #define chan_writel(chan, offset, val) writel(val, chan->reg + offset) | |
50 | ||
51 | #define mfd_readl(obj, offset) readl(obj->reg + offset) | |
52 | #define mfd_writel(obj, offset, val) writel(val, obj->reg + offset) | |
53 | ||
669b7a09 FT |
54 | #define HSU_DMA_TIMEOUT_CHECK_FREQ (HZ/10) |
55 | ||
d843fc6e FT |
56 | struct hsu_dma_buffer { |
57 | u8 *buf; | |
58 | dma_addr_t dma_addr; | |
59 | u32 dma_size; | |
60 | u32 ofs; | |
61 | }; | |
62 | ||
63 | struct hsu_dma_chan { | |
64 | u32 id; | |
06c77e21 | 65 | enum dma_data_direction dirt; |
d843fc6e | 66 | struct uart_hsu_port *uport; |
669b7a09 FT |
67 | void __iomem *reg; |
68 | struct timer_list rx_timer; /* only needed by RX channel */ | |
d843fc6e FT |
69 | }; |
70 | ||
71 | struct uart_hsu_port { | |
72 | struct uart_port port; | |
73 | unsigned char ier; | |
74 | unsigned char lcr; | |
75 | unsigned char mcr; | |
76 | unsigned int lsr_break_flag; | |
77 | char name[12]; | |
78 | int index; | |
79 | struct device *dev; | |
80 | ||
81 | struct hsu_dma_chan *txc; | |
82 | struct hsu_dma_chan *rxc; | |
83 | struct hsu_dma_buffer txbuf; | |
84 | struct hsu_dma_buffer rxbuf; | |
85 | int use_dma; /* flag for DMA/PIO */ | |
86 | int running; | |
87 | int dma_tx_on; | |
88 | }; | |
89 | ||
90 | /* Top level data structure of HSU */ | |
91 | struct hsu_port { | |
d843fc6e FT |
92 | void __iomem *reg; |
93 | unsigned long paddr; | |
94 | unsigned long iolen; | |
95 | u32 irq; | |
96 | ||
97 | struct uart_hsu_port port[3]; | |
98 | struct hsu_dma_chan chans[10]; | |
99 | ||
d843fc6e | 100 | struct dentry *debugfs; |
d843fc6e FT |
101 | }; |
102 | ||
d843fc6e FT |
103 | static inline unsigned int serial_in(struct uart_hsu_port *up, int offset) |
104 | { | |
105 | unsigned int val; | |
106 | ||
107 | if (offset > UART_MSR) { | |
108 | offset <<= 2; | |
109 | val = readl(up->port.membase + offset); | |
110 | } else | |
111 | val = (unsigned int)readb(up->port.membase + offset); | |
112 | ||
113 | return val; | |
114 | } | |
115 | ||
116 | static inline void serial_out(struct uart_hsu_port *up, int offset, int value) | |
117 | { | |
118 | if (offset > UART_MSR) { | |
119 | offset <<= 2; | |
120 | writel(value, up->port.membase + offset); | |
121 | } else { | |
122 | unsigned char val = value & 0xff; | |
123 | writeb(val, up->port.membase + offset); | |
124 | } | |
125 | } | |
126 | ||
127 | #ifdef CONFIG_DEBUG_FS | |
128 | ||
129 | #define HSU_REGS_BUFSIZE 1024 | |
130 | ||
131 | static int hsu_show_regs_open(struct inode *inode, struct file *file) | |
132 | { | |
133 | file->private_data = inode->i_private; | |
134 | return 0; | |
135 | } | |
136 | ||
137 | static ssize_t port_show_regs(struct file *file, char __user *user_buf, | |
138 | size_t count, loff_t *ppos) | |
139 | { | |
140 | struct uart_hsu_port *up = file->private_data; | |
141 | char *buf; | |
142 | u32 len = 0; | |
143 | ssize_t ret; | |
144 | ||
145 | buf = kzalloc(HSU_REGS_BUFSIZE, GFP_KERNEL); | |
146 | if (!buf) | |
147 | return 0; | |
148 | ||
149 | len += snprintf(buf + len, HSU_REGS_BUFSIZE - len, | |
150 | "MFD HSU port[%d] regs:\n", up->index); | |
151 | ||
152 | len += snprintf(buf + len, HSU_REGS_BUFSIZE - len, | |
153 | "=================================\n"); | |
154 | len += snprintf(buf + len, HSU_REGS_BUFSIZE - len, | |
155 | "IER: \t\t0x%08x\n", serial_in(up, UART_IER)); | |
156 | len += snprintf(buf + len, HSU_REGS_BUFSIZE - len, | |
157 | "IIR: \t\t0x%08x\n", serial_in(up, UART_IIR)); | |
158 | len += snprintf(buf + len, HSU_REGS_BUFSIZE - len, | |
159 | "LCR: \t\t0x%08x\n", serial_in(up, UART_LCR)); | |
160 | len += snprintf(buf + len, HSU_REGS_BUFSIZE - len, | |
161 | "MCR: \t\t0x%08x\n", serial_in(up, UART_MCR)); | |
162 | len += snprintf(buf + len, HSU_REGS_BUFSIZE - len, | |
163 | "LSR: \t\t0x%08x\n", serial_in(up, UART_LSR)); | |
164 | len += snprintf(buf + len, HSU_REGS_BUFSIZE - len, | |
165 | "MSR: \t\t0x%08x\n", serial_in(up, UART_MSR)); | |
166 | len += snprintf(buf + len, HSU_REGS_BUFSIZE - len, | |
167 | "FOR: \t\t0x%08x\n", serial_in(up, UART_FOR)); | |
168 | len += snprintf(buf + len, HSU_REGS_BUFSIZE - len, | |
169 | "PS: \t\t0x%08x\n", serial_in(up, UART_PS)); | |
170 | len += snprintf(buf + len, HSU_REGS_BUFSIZE - len, | |
171 | "MUL: \t\t0x%08x\n", serial_in(up, UART_MUL)); | |
172 | len += snprintf(buf + len, HSU_REGS_BUFSIZE - len, | |
173 | "DIV: \t\t0x%08x\n", serial_in(up, UART_DIV)); | |
174 | ||
a9589811 DC |
175 | if (len > HSU_REGS_BUFSIZE) |
176 | len = HSU_REGS_BUFSIZE; | |
177 | ||
d843fc6e FT |
178 | ret = simple_read_from_buffer(user_buf, count, ppos, buf, len); |
179 | kfree(buf); | |
180 | return ret; | |
181 | } | |
182 | ||
183 | static ssize_t dma_show_regs(struct file *file, char __user *user_buf, | |
184 | size_t count, loff_t *ppos) | |
185 | { | |
186 | struct hsu_dma_chan *chan = file->private_data; | |
187 | char *buf; | |
188 | u32 len = 0; | |
189 | ssize_t ret; | |
190 | ||
191 | buf = kzalloc(HSU_REGS_BUFSIZE, GFP_KERNEL); | |
192 | if (!buf) | |
193 | return 0; | |
194 | ||
195 | len += snprintf(buf + len, HSU_REGS_BUFSIZE - len, | |
196 | "MFD HSU DMA channel [%d] regs:\n", chan->id); | |
197 | ||
198 | len += snprintf(buf + len, HSU_REGS_BUFSIZE - len, | |
199 | "=================================\n"); | |
200 | len += snprintf(buf + len, HSU_REGS_BUFSIZE - len, | |
201 | "CR: \t\t0x%08x\n", chan_readl(chan, HSU_CH_CR)); | |
202 | len += snprintf(buf + len, HSU_REGS_BUFSIZE - len, | |
203 | "DCR: \t\t0x%08x\n", chan_readl(chan, HSU_CH_DCR)); | |
204 | len += snprintf(buf + len, HSU_REGS_BUFSIZE - len, | |
205 | "BSR: \t\t0x%08x\n", chan_readl(chan, HSU_CH_BSR)); | |
206 | len += snprintf(buf + len, HSU_REGS_BUFSIZE - len, | |
207 | "MOTSR: \t\t0x%08x\n", chan_readl(chan, HSU_CH_MOTSR)); | |
208 | len += snprintf(buf + len, HSU_REGS_BUFSIZE - len, | |
209 | "D0SAR: \t\t0x%08x\n", chan_readl(chan, HSU_CH_D0SAR)); | |
210 | len += snprintf(buf + len, HSU_REGS_BUFSIZE - len, | |
211 | "D0TSR: \t\t0x%08x\n", chan_readl(chan, HSU_CH_D0TSR)); | |
212 | len += snprintf(buf + len, HSU_REGS_BUFSIZE - len, | |
213 | "D0SAR: \t\t0x%08x\n", chan_readl(chan, HSU_CH_D1SAR)); | |
214 | len += snprintf(buf + len, HSU_REGS_BUFSIZE - len, | |
215 | "D0TSR: \t\t0x%08x\n", chan_readl(chan, HSU_CH_D1TSR)); | |
216 | len += snprintf(buf + len, HSU_REGS_BUFSIZE - len, | |
217 | "D0SAR: \t\t0x%08x\n", chan_readl(chan, HSU_CH_D2SAR)); | |
218 | len += snprintf(buf + len, HSU_REGS_BUFSIZE - len, | |
219 | "D0TSR: \t\t0x%08x\n", chan_readl(chan, HSU_CH_D2TSR)); | |
220 | len += snprintf(buf + len, HSU_REGS_BUFSIZE - len, | |
221 | "D0SAR: \t\t0x%08x\n", chan_readl(chan, HSU_CH_D3SAR)); | |
222 | len += snprintf(buf + len, HSU_REGS_BUFSIZE - len, | |
223 | "D0TSR: \t\t0x%08x\n", chan_readl(chan, HSU_CH_D3TSR)); | |
224 | ||
a9589811 DC |
225 | if (len > HSU_REGS_BUFSIZE) |
226 | len = HSU_REGS_BUFSIZE; | |
227 | ||
d843fc6e FT |
228 | ret = simple_read_from_buffer(user_buf, count, ppos, buf, len); |
229 | kfree(buf); | |
230 | return ret; | |
231 | } | |
232 | ||
233 | static const struct file_operations port_regs_ops = { | |
234 | .owner = THIS_MODULE, | |
235 | .open = hsu_show_regs_open, | |
236 | .read = port_show_regs, | |
6038f373 | 237 | .llseek = default_llseek, |
d843fc6e FT |
238 | }; |
239 | ||
240 | static const struct file_operations dma_regs_ops = { | |
241 | .owner = THIS_MODULE, | |
242 | .open = hsu_show_regs_open, | |
243 | .read = dma_show_regs, | |
6038f373 | 244 | .llseek = default_llseek, |
d843fc6e FT |
245 | }; |
246 | ||
247 | static int hsu_debugfs_init(struct hsu_port *hsu) | |
248 | { | |
249 | int i; | |
250 | char name[32]; | |
251 | ||
252 | hsu->debugfs = debugfs_create_dir("hsu", NULL); | |
253 | if (!hsu->debugfs) | |
254 | return -ENOMEM; | |
255 | ||
256 | for (i = 0; i < 3; i++) { | |
257 | snprintf(name, sizeof(name), "port_%d_regs", i); | |
258 | debugfs_create_file(name, S_IFREG | S_IRUGO, | |
259 | hsu->debugfs, (void *)(&hsu->port[i]), &port_regs_ops); | |
260 | } | |
261 | ||
262 | for (i = 0; i < 6; i++) { | |
263 | snprintf(name, sizeof(name), "dma_chan_%d_regs", i); | |
264 | debugfs_create_file(name, S_IFREG | S_IRUGO, | |
265 | hsu->debugfs, (void *)&hsu->chans[i], &dma_regs_ops); | |
266 | } | |
267 | ||
268 | return 0; | |
269 | } | |
270 | ||
271 | static void hsu_debugfs_remove(struct hsu_port *hsu) | |
272 | { | |
273 | if (hsu->debugfs) | |
274 | debugfs_remove_recursive(hsu->debugfs); | |
275 | } | |
276 | ||
277 | #else | |
278 | static inline int hsu_debugfs_init(struct hsu_port *hsu) | |
279 | { | |
280 | return 0; | |
281 | } | |
282 | ||
283 | static inline void hsu_debugfs_remove(struct hsu_port *hsu) | |
284 | { | |
285 | } | |
286 | #endif /* CONFIG_DEBUG_FS */ | |
287 | ||
288 | static void serial_hsu_enable_ms(struct uart_port *port) | |
289 | { | |
290 | struct uart_hsu_port *up = | |
291 | container_of(port, struct uart_hsu_port, port); | |
292 | ||
293 | up->ier |= UART_IER_MSI; | |
294 | serial_out(up, UART_IER, up->ier); | |
295 | } | |
296 | ||
297 | void hsu_dma_tx(struct uart_hsu_port *up) | |
298 | { | |
299 | struct circ_buf *xmit = &up->port.state->xmit; | |
300 | struct hsu_dma_buffer *dbuf = &up->txbuf; | |
301 | int count; | |
302 | ||
303 | /* test_and_set_bit may be better, but anyway it's in lock protected mode */ | |
304 | if (up->dma_tx_on) | |
305 | return; | |
306 | ||
307 | /* Update the circ buf info */ | |
308 | xmit->tail += dbuf->ofs; | |
309 | xmit->tail &= UART_XMIT_SIZE - 1; | |
310 | ||
311 | up->port.icount.tx += dbuf->ofs; | |
312 | dbuf->ofs = 0; | |
313 | ||
314 | /* Disable the channel */ | |
315 | chan_writel(up->txc, HSU_CH_CR, 0x0); | |
316 | ||
317 | if (!uart_circ_empty(xmit) && !uart_tx_stopped(&up->port)) { | |
318 | dma_sync_single_for_device(up->port.dev, | |
319 | dbuf->dma_addr, | |
320 | dbuf->dma_size, | |
321 | DMA_TO_DEVICE); | |
322 | ||
323 | count = CIRC_CNT_TO_END(xmit->head, xmit->tail, UART_XMIT_SIZE); | |
324 | dbuf->ofs = count; | |
325 | ||
326 | /* Reprogram the channel */ | |
327 | chan_writel(up->txc, HSU_CH_D0SAR, dbuf->dma_addr + xmit->tail); | |
328 | chan_writel(up->txc, HSU_CH_D0TSR, count); | |
329 | ||
330 | /* Reenable the channel */ | |
331 | chan_writel(up->txc, HSU_CH_DCR, 0x1 | |
332 | | (0x1 << 8) | |
333 | | (0x1 << 16) | |
334 | | (0x1 << 24)); | |
d843fc6e FT |
335 | up->dma_tx_on = 1; |
336 | chan_writel(up->txc, HSU_CH_CR, 0x1); | |
337 | } | |
338 | ||
339 | if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) | |
340 | uart_write_wakeup(&up->port); | |
341 | } | |
342 | ||
343 | /* The buffer is already cache coherent */ | |
344 | void hsu_dma_start_rx_chan(struct hsu_dma_chan *rxc, struct hsu_dma_buffer *dbuf) | |
345 | { | |
d843fc6e FT |
346 | dbuf->ofs = 0; |
347 | ||
348 | chan_writel(rxc, HSU_CH_BSR, 32); | |
349 | chan_writel(rxc, HSU_CH_MOTSR, 4); | |
350 | ||
351 | chan_writel(rxc, HSU_CH_D0SAR, dbuf->dma_addr); | |
352 | chan_writel(rxc, HSU_CH_D0TSR, dbuf->dma_size); | |
353 | chan_writel(rxc, HSU_CH_DCR, 0x1 | (0x1 << 8) | |
354 | | (0x1 << 16) | |
355 | | (0x1 << 24) /* timeout bit, see HSU Errata 1 */ | |
356 | ); | |
357 | chan_writel(rxc, HSU_CH_CR, 0x3); | |
669b7a09 FT |
358 | |
359 | mod_timer(&rxc->rx_timer, jiffies + HSU_DMA_TIMEOUT_CHECK_FREQ); | |
d843fc6e FT |
360 | } |
361 | ||
362 | /* Protected by spin_lock_irqsave(port->lock) */ | |
363 | static void serial_hsu_start_tx(struct uart_port *port) | |
364 | { | |
365 | struct uart_hsu_port *up = | |
366 | container_of(port, struct uart_hsu_port, port); | |
367 | ||
368 | if (up->use_dma) { | |
369 | hsu_dma_tx(up); | |
370 | } else if (!(up->ier & UART_IER_THRI)) { | |
371 | up->ier |= UART_IER_THRI; | |
372 | serial_out(up, UART_IER, up->ier); | |
373 | } | |
374 | } | |
375 | ||
376 | static void serial_hsu_stop_tx(struct uart_port *port) | |
377 | { | |
378 | struct uart_hsu_port *up = | |
379 | container_of(port, struct uart_hsu_port, port); | |
380 | struct hsu_dma_chan *txc = up->txc; | |
381 | ||
382 | if (up->use_dma) | |
383 | chan_writel(txc, HSU_CH_CR, 0x0); | |
384 | else if (up->ier & UART_IER_THRI) { | |
385 | up->ier &= ~UART_IER_THRI; | |
386 | serial_out(up, UART_IER, up->ier); | |
387 | } | |
388 | } | |
389 | ||
390 | /* This is always called in spinlock protected mode, so | |
391 | * modify timeout timer is safe here */ | |
392 | void hsu_dma_rx(struct uart_hsu_port *up, u32 int_sts) | |
393 | { | |
394 | struct hsu_dma_buffer *dbuf = &up->rxbuf; | |
395 | struct hsu_dma_chan *chan = up->rxc; | |
396 | struct uart_port *port = &up->port; | |
397 | struct tty_struct *tty = port->state->port.tty; | |
398 | int count; | |
399 | ||
400 | if (!tty) | |
401 | return; | |
402 | ||
403 | /* | |
06c77e21 | 404 | * First need to know how many is already transferred, |
d843fc6e FT |
405 | * then check if its a timeout DMA irq, and return |
406 | * the trail bytes out, push them up and reenable the | |
06c77e21 | 407 | * channel |
d843fc6e FT |
408 | */ |
409 | ||
06c77e21 | 410 | /* Timeout IRQ, need wait some time, see Errata 2 */ |
d843fc6e FT |
411 | if (int_sts & 0xf00) |
412 | udelay(2); | |
413 | ||
414 | /* Stop the channel */ | |
415 | chan_writel(chan, HSU_CH_CR, 0x0); | |
416 | ||
d843fc6e | 417 | count = chan_readl(chan, HSU_CH_D0SAR) - dbuf->dma_addr; |
669b7a09 | 418 | if (!count) { |
06c77e21 | 419 | /* Restart the channel before we leave */ |
669b7a09 | 420 | chan_writel(chan, HSU_CH_CR, 0x3); |
d843fc6e | 421 | return; |
669b7a09 | 422 | } |
669b7a09 | 423 | del_timer(&chan->rx_timer); |
d843fc6e FT |
424 | |
425 | dma_sync_single_for_cpu(port->dev, dbuf->dma_addr, | |
426 | dbuf->dma_size, DMA_FROM_DEVICE); | |
427 | ||
428 | /* | |
06c77e21 | 429 | * Head will only wrap around when we recycle |
d843fc6e FT |
430 | * the DMA buffer, and when that happens, we |
431 | * explicitly set tail to 0. So head will | |
432 | * always be greater than tail. | |
433 | */ | |
434 | tty_insert_flip_string(tty, dbuf->buf, count); | |
435 | port->icount.rx += count; | |
436 | ||
437 | dma_sync_single_for_device(up->port.dev, dbuf->dma_addr, | |
438 | dbuf->dma_size, DMA_FROM_DEVICE); | |
439 | ||
440 | /* Reprogram the channel */ | |
441 | chan_writel(chan, HSU_CH_D0SAR, dbuf->dma_addr); | |
442 | chan_writel(chan, HSU_CH_D0TSR, dbuf->dma_size); | |
443 | chan_writel(chan, HSU_CH_DCR, 0x1 | |
444 | | (0x1 << 8) | |
445 | | (0x1 << 16) | |
446 | | (0x1 << 24) /* timeout bit, see HSU Errata 1 */ | |
447 | ); | |
669b7a09 FT |
448 | tty_flip_buffer_push(tty); |
449 | ||
d843fc6e | 450 | chan_writel(chan, HSU_CH_CR, 0x3); |
669b7a09 FT |
451 | chan->rx_timer.expires = jiffies + HSU_DMA_TIMEOUT_CHECK_FREQ; |
452 | add_timer(&chan->rx_timer); | |
d843fc6e | 453 | |
d843fc6e FT |
454 | } |
455 | ||
456 | static void serial_hsu_stop_rx(struct uart_port *port) | |
457 | { | |
458 | struct uart_hsu_port *up = | |
459 | container_of(port, struct uart_hsu_port, port); | |
460 | struct hsu_dma_chan *chan = up->rxc; | |
461 | ||
462 | if (up->use_dma) | |
463 | chan_writel(chan, HSU_CH_CR, 0x2); | |
464 | else { | |
465 | up->ier &= ~UART_IER_RLSI; | |
466 | up->port.read_status_mask &= ~UART_LSR_DR; | |
467 | serial_out(up, UART_IER, up->ier); | |
468 | } | |
469 | } | |
470 | ||
d843fc6e FT |
471 | static inline void receive_chars(struct uart_hsu_port *up, int *status) |
472 | { | |
473 | struct tty_struct *tty = up->port.state->port.tty; | |
474 | unsigned int ch, flag; | |
475 | unsigned int max_count = 256; | |
476 | ||
477 | if (!tty) | |
478 | return; | |
479 | ||
480 | do { | |
481 | ch = serial_in(up, UART_RX); | |
482 | flag = TTY_NORMAL; | |
483 | up->port.icount.rx++; | |
484 | ||
485 | if (unlikely(*status & (UART_LSR_BI | UART_LSR_PE | | |
486 | UART_LSR_FE | UART_LSR_OE))) { | |
487 | ||
488 | dev_warn(up->dev, "We really rush into ERR/BI case" | |
489 | "status = 0x%02x", *status); | |
490 | /* For statistics only */ | |
491 | if (*status & UART_LSR_BI) { | |
492 | *status &= ~(UART_LSR_FE | UART_LSR_PE); | |
493 | up->port.icount.brk++; | |
494 | /* | |
495 | * We do the SysRQ and SAK checking | |
496 | * here because otherwise the break | |
497 | * may get masked by ignore_status_mask | |
498 | * or read_status_mask. | |
499 | */ | |
500 | if (uart_handle_break(&up->port)) | |
501 | goto ignore_char; | |
502 | } else if (*status & UART_LSR_PE) | |
503 | up->port.icount.parity++; | |
504 | else if (*status & UART_LSR_FE) | |
505 | up->port.icount.frame++; | |
506 | if (*status & UART_LSR_OE) | |
507 | up->port.icount.overrun++; | |
508 | ||
509 | /* Mask off conditions which should be ignored. */ | |
510 | *status &= up->port.read_status_mask; | |
511 | ||
512 | #ifdef CONFIG_SERIAL_MFD_HSU_CONSOLE | |
513 | if (up->port.cons && | |
514 | up->port.cons->index == up->port.line) { | |
515 | /* Recover the break flag from console xmit */ | |
516 | *status |= up->lsr_break_flag; | |
517 | up->lsr_break_flag = 0; | |
518 | } | |
519 | #endif | |
520 | if (*status & UART_LSR_BI) { | |
521 | flag = TTY_BREAK; | |
522 | } else if (*status & UART_LSR_PE) | |
523 | flag = TTY_PARITY; | |
524 | else if (*status & UART_LSR_FE) | |
525 | flag = TTY_FRAME; | |
526 | } | |
527 | ||
528 | if (uart_handle_sysrq_char(&up->port, ch)) | |
529 | goto ignore_char; | |
530 | ||
531 | uart_insert_char(&up->port, *status, UART_LSR_OE, ch, flag); | |
532 | ignore_char: | |
533 | *status = serial_in(up, UART_LSR); | |
534 | } while ((*status & UART_LSR_DR) && max_count--); | |
535 | tty_flip_buffer_push(tty); | |
536 | } | |
537 | ||
538 | static void transmit_chars(struct uart_hsu_port *up) | |
539 | { | |
540 | struct circ_buf *xmit = &up->port.state->xmit; | |
541 | int count; | |
d843fc6e FT |
542 | |
543 | if (up->port.x_char) { | |
544 | serial_out(up, UART_TX, up->port.x_char); | |
545 | up->port.icount.tx++; | |
546 | up->port.x_char = 0; | |
547 | return; | |
548 | } | |
549 | if (uart_circ_empty(xmit) || uart_tx_stopped(&up->port)) { | |
550 | serial_hsu_stop_tx(&up->port); | |
551 | return; | |
552 | } | |
553 | ||
554 | #ifndef MFD_HSU_A0_STEPPING | |
555 | count = up->port.fifosize / 2; | |
556 | #else | |
557 | /* | |
558 | * A0 only supports fully empty IRQ, and the first char written | |
559 | * into it won't clear the EMPT bit, so we may need be cautious | |
560 | * by useing a shorter buffer | |
561 | */ | |
d843fc6e FT |
562 | count = up->port.fifosize - 4; |
563 | #endif | |
564 | do { | |
565 | serial_out(up, UART_TX, xmit->buf[xmit->tail]); | |
566 | xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1); | |
d843fc6e FT |
567 | |
568 | up->port.icount.tx++; | |
569 | if (uart_circ_empty(xmit)) | |
570 | break; | |
571 | } while (--count > 0); | |
572 | ||
573 | if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) | |
574 | uart_write_wakeup(&up->port); | |
575 | ||
576 | if (uart_circ_empty(xmit)) | |
577 | serial_hsu_stop_tx(&up->port); | |
578 | } | |
579 | ||
580 | static inline void check_modem_status(struct uart_hsu_port *up) | |
581 | { | |
582 | int status; | |
583 | ||
584 | status = serial_in(up, UART_MSR); | |
585 | ||
586 | if ((status & UART_MSR_ANY_DELTA) == 0) | |
587 | return; | |
588 | ||
589 | if (status & UART_MSR_TERI) | |
590 | up->port.icount.rng++; | |
591 | if (status & UART_MSR_DDSR) | |
592 | up->port.icount.dsr++; | |
593 | /* We may only get DDCD when HW init and reset */ | |
594 | if (status & UART_MSR_DDCD) | |
595 | uart_handle_dcd_change(&up->port, status & UART_MSR_DCD); | |
06c77e21 | 596 | /* Will start/stop_tx accordingly */ |
d843fc6e FT |
597 | if (status & UART_MSR_DCTS) |
598 | uart_handle_cts_change(&up->port, status & UART_MSR_CTS); | |
599 | ||
600 | wake_up_interruptible(&up->port.state->port.delta_msr_wait); | |
601 | } | |
602 | ||
603 | /* | |
604 | * This handles the interrupt from one port. | |
605 | */ | |
606 | static irqreturn_t port_irq(int irq, void *dev_id) | |
607 | { | |
608 | struct uart_hsu_port *up = dev_id; | |
609 | unsigned int iir, lsr; | |
610 | unsigned long flags; | |
611 | ||
612 | if (unlikely(!up->running)) | |
613 | return IRQ_NONE; | |
614 | ||
06c77e21 | 615 | spin_lock_irqsave(&up->port.lock, flags); |
d843fc6e FT |
616 | if (up->use_dma) { |
617 | lsr = serial_in(up, UART_LSR); | |
618 | if (unlikely(lsr & (UART_LSR_BI | UART_LSR_PE | | |
619 | UART_LSR_FE | UART_LSR_OE))) | |
620 | dev_warn(up->dev, | |
621 | "Got lsr irq while using DMA, lsr = 0x%2x\n", | |
622 | lsr); | |
623 | check_modem_status(up); | |
06c77e21 | 624 | spin_unlock_irqrestore(&up->port.lock, flags); |
d843fc6e FT |
625 | return IRQ_HANDLED; |
626 | } | |
627 | ||
d843fc6e FT |
628 | iir = serial_in(up, UART_IIR); |
629 | if (iir & UART_IIR_NO_INT) { | |
630 | spin_unlock_irqrestore(&up->port.lock, flags); | |
631 | return IRQ_NONE; | |
632 | } | |
633 | ||
634 | lsr = serial_in(up, UART_LSR); | |
d843fc6e FT |
635 | if (lsr & UART_LSR_DR) |
636 | receive_chars(up, &lsr); | |
06c77e21 | 637 | check_modem_status(up); |
d843fc6e FT |
638 | |
639 | /* lsr will be renewed during the receive_chars */ | |
640 | if (lsr & UART_LSR_THRE) | |
641 | transmit_chars(up); | |
642 | ||
643 | spin_unlock_irqrestore(&up->port.lock, flags); | |
644 | return IRQ_HANDLED; | |
645 | } | |
646 | ||
647 | static inline void dma_chan_irq(struct hsu_dma_chan *chan) | |
648 | { | |
649 | struct uart_hsu_port *up = chan->uport; | |
650 | unsigned long flags; | |
651 | u32 int_sts; | |
652 | ||
653 | spin_lock_irqsave(&up->port.lock, flags); | |
654 | ||
655 | if (!up->use_dma || !up->running) | |
656 | goto exit; | |
657 | ||
658 | /* | |
659 | * No matter what situation, need read clear the IRQ status | |
660 | * There is a bug, see Errata 5, HSD 2900918 | |
661 | */ | |
662 | int_sts = chan_readl(chan, HSU_CH_SR); | |
663 | ||
664 | /* Rx channel */ | |
665 | if (chan->dirt == DMA_FROM_DEVICE) | |
666 | hsu_dma_rx(up, int_sts); | |
667 | ||
668 | /* Tx channel */ | |
669 | if (chan->dirt == DMA_TO_DEVICE) { | |
d843fc6e FT |
670 | chan_writel(chan, HSU_CH_CR, 0x0); |
671 | up->dma_tx_on = 0; | |
672 | hsu_dma_tx(up); | |
673 | } | |
674 | ||
675 | exit: | |
676 | spin_unlock_irqrestore(&up->port.lock, flags); | |
677 | return; | |
678 | } | |
679 | ||
680 | static irqreturn_t dma_irq(int irq, void *dev_id) | |
681 | { | |
682 | struct hsu_port *hsu = dev_id; | |
683 | u32 int_sts, i; | |
684 | ||
685 | int_sts = mfd_readl(hsu, HSU_GBL_DMAISR); | |
686 | ||
687 | /* Currently we only have 6 channels may be used */ | |
688 | for (i = 0; i < 6; i++) { | |
689 | if (int_sts & 0x1) | |
690 | dma_chan_irq(&hsu->chans[i]); | |
691 | int_sts >>= 1; | |
692 | } | |
693 | ||
694 | return IRQ_HANDLED; | |
695 | } | |
696 | ||
697 | static unsigned int serial_hsu_tx_empty(struct uart_port *port) | |
698 | { | |
699 | struct uart_hsu_port *up = | |
700 | container_of(port, struct uart_hsu_port, port); | |
701 | unsigned long flags; | |
702 | unsigned int ret; | |
703 | ||
704 | spin_lock_irqsave(&up->port.lock, flags); | |
705 | ret = serial_in(up, UART_LSR) & UART_LSR_TEMT ? TIOCSER_TEMT : 0; | |
706 | spin_unlock_irqrestore(&up->port.lock, flags); | |
707 | ||
708 | return ret; | |
709 | } | |
710 | ||
711 | static unsigned int serial_hsu_get_mctrl(struct uart_port *port) | |
712 | { | |
713 | struct uart_hsu_port *up = | |
714 | container_of(port, struct uart_hsu_port, port); | |
715 | unsigned char status; | |
716 | unsigned int ret; | |
717 | ||
718 | status = serial_in(up, UART_MSR); | |
719 | ||
720 | ret = 0; | |
721 | if (status & UART_MSR_DCD) | |
722 | ret |= TIOCM_CAR; | |
723 | if (status & UART_MSR_RI) | |
724 | ret |= TIOCM_RNG; | |
725 | if (status & UART_MSR_DSR) | |
726 | ret |= TIOCM_DSR; | |
727 | if (status & UART_MSR_CTS) | |
728 | ret |= TIOCM_CTS; | |
729 | return ret; | |
730 | } | |
731 | ||
732 | static void serial_hsu_set_mctrl(struct uart_port *port, unsigned int mctrl) | |
733 | { | |
734 | struct uart_hsu_port *up = | |
735 | container_of(port, struct uart_hsu_port, port); | |
736 | unsigned char mcr = 0; | |
737 | ||
738 | if (mctrl & TIOCM_RTS) | |
739 | mcr |= UART_MCR_RTS; | |
740 | if (mctrl & TIOCM_DTR) | |
741 | mcr |= UART_MCR_DTR; | |
742 | if (mctrl & TIOCM_OUT1) | |
743 | mcr |= UART_MCR_OUT1; | |
744 | if (mctrl & TIOCM_OUT2) | |
745 | mcr |= UART_MCR_OUT2; | |
746 | if (mctrl & TIOCM_LOOP) | |
747 | mcr |= UART_MCR_LOOP; | |
748 | ||
749 | mcr |= up->mcr; | |
750 | ||
751 | serial_out(up, UART_MCR, mcr); | |
752 | } | |
753 | ||
754 | static void serial_hsu_break_ctl(struct uart_port *port, int break_state) | |
755 | { | |
756 | struct uart_hsu_port *up = | |
757 | container_of(port, struct uart_hsu_port, port); | |
758 | unsigned long flags; | |
759 | ||
760 | spin_lock_irqsave(&up->port.lock, flags); | |
761 | if (break_state == -1) | |
762 | up->lcr |= UART_LCR_SBC; | |
763 | else | |
764 | up->lcr &= ~UART_LCR_SBC; | |
765 | serial_out(up, UART_LCR, up->lcr); | |
766 | spin_unlock_irqrestore(&up->port.lock, flags); | |
767 | } | |
768 | ||
769 | /* | |
770 | * What special to do: | |
771 | * 1. chose the 64B fifo mode | |
772 | * 2. make sure not to select half empty mode for A0 stepping | |
773 | * 3. start dma or pio depends on configuration | |
774 | * 4. we only allocate dma memory when needed | |
775 | */ | |
776 | static int serial_hsu_startup(struct uart_port *port) | |
777 | { | |
778 | struct uart_hsu_port *up = | |
779 | container_of(port, struct uart_hsu_port, port); | |
780 | unsigned long flags; | |
781 | ||
782 | /* | |
783 | * Clear the FIFO buffers and disable them. | |
784 | * (they will be reenabled in set_termios()) | |
785 | */ | |
786 | serial_out(up, UART_FCR, UART_FCR_ENABLE_FIFO); | |
787 | serial_out(up, UART_FCR, UART_FCR_ENABLE_FIFO | | |
788 | UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT); | |
789 | serial_out(up, UART_FCR, 0); | |
790 | ||
791 | /* Clear the interrupt registers. */ | |
792 | (void) serial_in(up, UART_LSR); | |
793 | (void) serial_in(up, UART_RX); | |
794 | (void) serial_in(up, UART_IIR); | |
795 | (void) serial_in(up, UART_MSR); | |
796 | ||
797 | /* Now, initialize the UART, default is 8n1 */ | |
798 | serial_out(up, UART_LCR, UART_LCR_WLEN8); | |
799 | ||
800 | spin_lock_irqsave(&up->port.lock, flags); | |
801 | ||
802 | up->port.mctrl |= TIOCM_OUT2; | |
803 | serial_hsu_set_mctrl(&up->port, up->port.mctrl); | |
804 | ||
805 | /* | |
806 | * Finally, enable interrupts. Note: Modem status interrupts | |
807 | * are set via set_termios(), which will be occurring imminently | |
808 | * anyway, so we don't enable them here. | |
809 | */ | |
810 | if (!up->use_dma) | |
811 | up->ier = UART_IER_RLSI | UART_IER_RDI | UART_IER_RTOIE; | |
812 | else | |
813 | up->ier = 0; | |
814 | serial_out(up, UART_IER, up->ier); | |
815 | ||
816 | spin_unlock_irqrestore(&up->port.lock, flags); | |
817 | ||
818 | /* DMA init */ | |
d843fc6e FT |
819 | if (up->use_dma) { |
820 | struct hsu_dma_buffer *dbuf; | |
821 | struct circ_buf *xmit = &port->state->xmit; | |
822 | ||
823 | up->dma_tx_on = 0; | |
824 | ||
825 | /* First allocate the RX buffer */ | |
826 | dbuf = &up->rxbuf; | |
827 | dbuf->buf = kzalloc(HSU_DMA_BUF_SIZE, GFP_KERNEL); | |
828 | if (!dbuf->buf) { | |
829 | up->use_dma = 0; | |
830 | goto exit; | |
831 | } | |
832 | dbuf->dma_addr = dma_map_single(port->dev, | |
833 | dbuf->buf, | |
834 | HSU_DMA_BUF_SIZE, | |
835 | DMA_FROM_DEVICE); | |
836 | dbuf->dma_size = HSU_DMA_BUF_SIZE; | |
837 | ||
838 | /* Start the RX channel right now */ | |
839 | hsu_dma_start_rx_chan(up->rxc, dbuf); | |
840 | ||
841 | /* Next init the TX DMA */ | |
842 | dbuf = &up->txbuf; | |
843 | dbuf->buf = xmit->buf; | |
844 | dbuf->dma_addr = dma_map_single(port->dev, | |
845 | dbuf->buf, | |
846 | UART_XMIT_SIZE, | |
847 | DMA_TO_DEVICE); | |
848 | dbuf->dma_size = UART_XMIT_SIZE; | |
849 | ||
850 | /* This should not be changed all around */ | |
851 | chan_writel(up->txc, HSU_CH_BSR, 32); | |
852 | chan_writel(up->txc, HSU_CH_MOTSR, 4); | |
853 | dbuf->ofs = 0; | |
854 | } | |
855 | ||
856 | exit: | |
857 | /* And clear the interrupt registers again for luck. */ | |
858 | (void) serial_in(up, UART_LSR); | |
859 | (void) serial_in(up, UART_RX); | |
860 | (void) serial_in(up, UART_IIR); | |
861 | (void) serial_in(up, UART_MSR); | |
862 | ||
863 | up->running = 1; | |
864 | return 0; | |
865 | } | |
866 | ||
867 | static void serial_hsu_shutdown(struct uart_port *port) | |
868 | { | |
869 | struct uart_hsu_port *up = | |
870 | container_of(port, struct uart_hsu_port, port); | |
871 | unsigned long flags; | |
872 | ||
669b7a09 FT |
873 | del_timer_sync(&up->rxc->rx_timer); |
874 | ||
d843fc6e FT |
875 | /* Disable interrupts from this port */ |
876 | up->ier = 0; | |
877 | serial_out(up, UART_IER, 0); | |
878 | up->running = 0; | |
879 | ||
880 | spin_lock_irqsave(&up->port.lock, flags); | |
881 | up->port.mctrl &= ~TIOCM_OUT2; | |
882 | serial_hsu_set_mctrl(&up->port, up->port.mctrl); | |
883 | spin_unlock_irqrestore(&up->port.lock, flags); | |
884 | ||
885 | /* Disable break condition and FIFOs */ | |
886 | serial_out(up, UART_LCR, serial_in(up, UART_LCR) & ~UART_LCR_SBC); | |
887 | serial_out(up, UART_FCR, UART_FCR_ENABLE_FIFO | | |
888 | UART_FCR_CLEAR_RCVR | | |
889 | UART_FCR_CLEAR_XMIT); | |
890 | serial_out(up, UART_FCR, 0); | |
891 | } | |
892 | ||
893 | static void | |
894 | serial_hsu_set_termios(struct uart_port *port, struct ktermios *termios, | |
895 | struct ktermios *old) | |
896 | { | |
897 | struct uart_hsu_port *up = | |
898 | container_of(port, struct uart_hsu_port, port); | |
899 | struct tty_struct *tty = port->state->port.tty; | |
900 | unsigned char cval, fcr = 0; | |
901 | unsigned long flags; | |
902 | unsigned int baud, quot; | |
903 | u32 mul = 0x3600; | |
904 | u32 ps = 0x10; | |
905 | ||
906 | switch (termios->c_cflag & CSIZE) { | |
907 | case CS5: | |
908 | cval = UART_LCR_WLEN5; | |
909 | break; | |
910 | case CS6: | |
911 | cval = UART_LCR_WLEN6; | |
912 | break; | |
913 | case CS7: | |
914 | cval = UART_LCR_WLEN7; | |
915 | break; | |
916 | default: | |
917 | case CS8: | |
918 | cval = UART_LCR_WLEN8; | |
919 | break; | |
920 | } | |
921 | ||
922 | /* CMSPAR isn't supported by this driver */ | |
923 | if (tty) | |
924 | tty->termios->c_cflag &= ~CMSPAR; | |
925 | ||
926 | if (termios->c_cflag & CSTOPB) | |
927 | cval |= UART_LCR_STOP; | |
928 | if (termios->c_cflag & PARENB) | |
929 | cval |= UART_LCR_PARITY; | |
930 | if (!(termios->c_cflag & PARODD)) | |
931 | cval |= UART_LCR_EPAR; | |
932 | ||
933 | /* | |
e5586ecc FT |
934 | * The base clk is 50Mhz, and the baud rate come from: |
935 | * baud = 50M * MUL / (DIV * PS * DLAB) | |
936 | * | |
d843fc6e | 937 | * For those basic low baud rate we can get the direct |
e5586ecc FT |
938 | * scalar from 2746800, like 115200 = 2746800/24. For those |
939 | * higher baud rate, we handle them case by case, mainly by | |
940 | * adjusting the MUL/PS registers, and DIV register is kept | |
941 | * as default value 0x3d09 to make things simple | |
d843fc6e FT |
942 | */ |
943 | baud = uart_get_baud_rate(port, termios, old, 0, 4000000); | |
d843fc6e | 944 | |
e5586ecc | 945 | quot = 1; |
d843fc6e FT |
946 | switch (baud) { |
947 | case 3500000: | |
948 | mul = 0x3345; | |
949 | ps = 0xC; | |
e5586ecc FT |
950 | break; |
951 | case 3000000: | |
952 | mul = 0x2EE0; | |
d843fc6e FT |
953 | break; |
954 | case 2500000: | |
955 | mul = 0x2710; | |
d843fc6e | 956 | break; |
e5586ecc FT |
957 | case 2000000: |
958 | mul = 0x1F40; | |
959 | break; | |
960 | case 1843200: | |
d843fc6e | 961 | mul = 0x2400; |
d843fc6e FT |
962 | break; |
963 | case 1500000: | |
e5586ecc FT |
964 | mul = 0x1770; |
965 | break; | |
966 | case 1000000: | |
967 | mul = 0xFA0; | |
968 | break; | |
969 | case 500000: | |
970 | mul = 0x7D0; | |
d843fc6e FT |
971 | break; |
972 | default: | |
e5586ecc FT |
973 | /* Use uart_get_divisor to get quot for other baud rates */ |
974 | quot = 0; | |
d843fc6e FT |
975 | } |
976 | ||
e5586ecc FT |
977 | if (!quot) |
978 | quot = uart_get_divisor(port, baud); | |
979 | ||
d843fc6e FT |
980 | if ((up->port.uartclk / quot) < (2400 * 16)) |
981 | fcr = UART_FCR_ENABLE_FIFO | UART_FCR_HSU_64_1B; | |
982 | else if ((up->port.uartclk / quot) < (230400 * 16)) | |
983 | fcr = UART_FCR_ENABLE_FIFO | UART_FCR_HSU_64_16B; | |
984 | else | |
985 | fcr = UART_FCR_ENABLE_FIFO | UART_FCR_HSU_64_32B; | |
986 | ||
987 | fcr |= UART_FCR_HSU_64B_FIFO; | |
988 | #ifdef MFD_HSU_A0_STEPPING | |
989 | /* A0 doesn't support half empty IRQ */ | |
990 | fcr |= UART_FCR_FULL_EMPT_TXI; | |
991 | #endif | |
992 | ||
993 | /* | |
994 | * Ok, we're now changing the port state. Do it with | |
995 | * interrupts disabled. | |
996 | */ | |
997 | spin_lock_irqsave(&up->port.lock, flags); | |
998 | ||
999 | /* Update the per-port timeout */ | |
1000 | uart_update_timeout(port, termios->c_cflag, baud); | |
1001 | ||
1002 | up->port.read_status_mask = UART_LSR_OE | UART_LSR_THRE | UART_LSR_DR; | |
1003 | if (termios->c_iflag & INPCK) | |
1004 | up->port.read_status_mask |= UART_LSR_FE | UART_LSR_PE; | |
1005 | if (termios->c_iflag & (BRKINT | PARMRK)) | |
1006 | up->port.read_status_mask |= UART_LSR_BI; | |
1007 | ||
1008 | /* Characters to ignore */ | |
1009 | up->port.ignore_status_mask = 0; | |
1010 | if (termios->c_iflag & IGNPAR) | |
1011 | up->port.ignore_status_mask |= UART_LSR_PE | UART_LSR_FE; | |
1012 | if (termios->c_iflag & IGNBRK) { | |
1013 | up->port.ignore_status_mask |= UART_LSR_BI; | |
1014 | /* | |
1015 | * If we're ignoring parity and break indicators, | |
1016 | * ignore overruns too (for real raw support). | |
1017 | */ | |
1018 | if (termios->c_iflag & IGNPAR) | |
1019 | up->port.ignore_status_mask |= UART_LSR_OE; | |
1020 | } | |
1021 | ||
1022 | /* Ignore all characters if CREAD is not set */ | |
1023 | if ((termios->c_cflag & CREAD) == 0) | |
1024 | up->port.ignore_status_mask |= UART_LSR_DR; | |
1025 | ||
1026 | /* | |
1027 | * CTS flow control flag and modem status interrupts, disable | |
1028 | * MSI by default | |
1029 | */ | |
1030 | up->ier &= ~UART_IER_MSI; | |
1031 | if (UART_ENABLE_MS(&up->port, termios->c_cflag)) | |
1032 | up->ier |= UART_IER_MSI; | |
1033 | ||
1034 | serial_out(up, UART_IER, up->ier); | |
1035 | ||
1036 | if (termios->c_cflag & CRTSCTS) | |
1037 | up->mcr |= UART_MCR_AFE | UART_MCR_RTS; | |
1038 | else | |
1039 | up->mcr &= ~UART_MCR_AFE; | |
1040 | ||
1041 | serial_out(up, UART_LCR, cval | UART_LCR_DLAB); /* set DLAB */ | |
1042 | serial_out(up, UART_DLL, quot & 0xff); /* LS of divisor */ | |
1043 | serial_out(up, UART_DLM, quot >> 8); /* MS of divisor */ | |
1044 | serial_out(up, UART_LCR, cval); /* reset DLAB */ | |
1045 | serial_out(up, UART_MUL, mul); /* set MUL */ | |
1046 | serial_out(up, UART_PS, ps); /* set PS */ | |
1047 | up->lcr = cval; /* Save LCR */ | |
1048 | serial_hsu_set_mctrl(&up->port, up->port.mctrl); | |
1049 | serial_out(up, UART_FCR, fcr); | |
1050 | spin_unlock_irqrestore(&up->port.lock, flags); | |
1051 | } | |
1052 | ||
1053 | static void | |
1054 | serial_hsu_pm(struct uart_port *port, unsigned int state, | |
1055 | unsigned int oldstate) | |
1056 | { | |
1057 | } | |
1058 | ||
1059 | static void serial_hsu_release_port(struct uart_port *port) | |
1060 | { | |
1061 | } | |
1062 | ||
1063 | static int serial_hsu_request_port(struct uart_port *port) | |
1064 | { | |
1065 | return 0; | |
1066 | } | |
1067 | ||
1068 | static void serial_hsu_config_port(struct uart_port *port, int flags) | |
1069 | { | |
d843fc6e FT |
1070 | struct uart_hsu_port *up = |
1071 | container_of(port, struct uart_hsu_port, port); | |
1072 | up->port.type = PORT_MFD; | |
d843fc6e FT |
1073 | } |
1074 | ||
1075 | static int | |
1076 | serial_hsu_verify_port(struct uart_port *port, struct serial_struct *ser) | |
1077 | { | |
1078 | /* We don't want the core code to modify any port params */ | |
1079 | return -EINVAL; | |
1080 | } | |
1081 | ||
1082 | static const char * | |
1083 | serial_hsu_type(struct uart_port *port) | |
1084 | { | |
1085 | struct uart_hsu_port *up = | |
1086 | container_of(port, struct uart_hsu_port, port); | |
1087 | return up->name; | |
1088 | } | |
1089 | ||
1090 | /* Mainly for uart console use */ | |
1091 | static struct uart_hsu_port *serial_hsu_ports[3]; | |
1092 | static struct uart_driver serial_hsu_reg; | |
1093 | ||
1094 | #ifdef CONFIG_SERIAL_MFD_HSU_CONSOLE | |
1095 | ||
1096 | #define BOTH_EMPTY (UART_LSR_TEMT | UART_LSR_THRE) | |
1097 | ||
1098 | /* Wait for transmitter & holding register to empty */ | |
1099 | static inline void wait_for_xmitr(struct uart_hsu_port *up) | |
1100 | { | |
1101 | unsigned int status, tmout = 1000; | |
1102 | ||
1103 | /* Wait up to 1ms for the character to be sent. */ | |
1104 | do { | |
1105 | status = serial_in(up, UART_LSR); | |
1106 | ||
1107 | if (status & UART_LSR_BI) | |
1108 | up->lsr_break_flag = UART_LSR_BI; | |
1109 | ||
1110 | if (--tmout == 0) | |
1111 | break; | |
1112 | udelay(1); | |
1113 | } while (!(status & BOTH_EMPTY)); | |
1114 | ||
1115 | /* Wait up to 1s for flow control if necessary */ | |
1116 | if (up->port.flags & UPF_CONS_FLOW) { | |
1117 | tmout = 1000000; | |
1118 | while (--tmout && | |
1119 | ((serial_in(up, UART_MSR) & UART_MSR_CTS) == 0)) | |
1120 | udelay(1); | |
1121 | } | |
1122 | } | |
1123 | ||
1124 | static void serial_hsu_console_putchar(struct uart_port *port, int ch) | |
1125 | { | |
1126 | struct uart_hsu_port *up = | |
1127 | container_of(port, struct uart_hsu_port, port); | |
1128 | ||
1129 | wait_for_xmitr(up); | |
1130 | serial_out(up, UART_TX, ch); | |
1131 | } | |
1132 | ||
1133 | /* | |
1134 | * Print a string to the serial port trying not to disturb | |
1135 | * any possible real use of the port... | |
1136 | * | |
1137 | * The console_lock must be held when we get here. | |
1138 | */ | |
1139 | static void | |
1140 | serial_hsu_console_write(struct console *co, const char *s, unsigned int count) | |
1141 | { | |
1142 | struct uart_hsu_port *up = serial_hsu_ports[co->index]; | |
1143 | unsigned long flags; | |
1144 | unsigned int ier; | |
1145 | int locked = 1; | |
1146 | ||
1147 | local_irq_save(flags); | |
1148 | if (up->port.sysrq) | |
1149 | locked = 0; | |
1150 | else if (oops_in_progress) { | |
1151 | locked = spin_trylock(&up->port.lock); | |
1152 | } else | |
1153 | spin_lock(&up->port.lock); | |
1154 | ||
1155 | /* First save the IER then disable the interrupts */ | |
1156 | ier = serial_in(up, UART_IER); | |
1157 | serial_out(up, UART_IER, 0); | |
1158 | ||
1159 | uart_console_write(&up->port, s, count, serial_hsu_console_putchar); | |
1160 | ||
1161 | /* | |
1162 | * Finally, wait for transmitter to become empty | |
1163 | * and restore the IER | |
1164 | */ | |
1165 | wait_for_xmitr(up); | |
1166 | serial_out(up, UART_IER, ier); | |
1167 | ||
1168 | if (locked) | |
1169 | spin_unlock(&up->port.lock); | |
1170 | local_irq_restore(flags); | |
1171 | } | |
1172 | ||
1173 | static struct console serial_hsu_console; | |
1174 | ||
1175 | static int __init | |
1176 | serial_hsu_console_setup(struct console *co, char *options) | |
1177 | { | |
1178 | struct uart_hsu_port *up; | |
1179 | int baud = 115200; | |
1180 | int bits = 8; | |
1181 | int parity = 'n'; | |
1182 | int flow = 'n'; | |
1183 | int ret; | |
1184 | ||
1185 | if (co->index == -1 || co->index >= serial_hsu_reg.nr) | |
1186 | co->index = 0; | |
1187 | up = serial_hsu_ports[co->index]; | |
1188 | if (!up) | |
1189 | return -ENODEV; | |
1190 | ||
1191 | if (options) | |
1192 | uart_parse_options(options, &baud, &parity, &bits, &flow); | |
1193 | ||
1194 | ret = uart_set_options(&up->port, co, baud, parity, bits, flow); | |
1195 | ||
1196 | return ret; | |
1197 | } | |
1198 | ||
1199 | static struct console serial_hsu_console = { | |
1200 | .name = "ttyMFD", | |
1201 | .write = serial_hsu_console_write, | |
1202 | .device = uart_console_device, | |
1203 | .setup = serial_hsu_console_setup, | |
1204 | .flags = CON_PRINTBUFFER, | |
1205 | .index = 2, | |
1206 | .data = &serial_hsu_reg, | |
1207 | }; | |
1208 | #endif | |
1209 | ||
1210 | struct uart_ops serial_hsu_pops = { | |
1211 | .tx_empty = serial_hsu_tx_empty, | |
1212 | .set_mctrl = serial_hsu_set_mctrl, | |
1213 | .get_mctrl = serial_hsu_get_mctrl, | |
1214 | .stop_tx = serial_hsu_stop_tx, | |
1215 | .start_tx = serial_hsu_start_tx, | |
1216 | .stop_rx = serial_hsu_stop_rx, | |
1217 | .enable_ms = serial_hsu_enable_ms, | |
1218 | .break_ctl = serial_hsu_break_ctl, | |
1219 | .startup = serial_hsu_startup, | |
1220 | .shutdown = serial_hsu_shutdown, | |
1221 | .set_termios = serial_hsu_set_termios, | |
1222 | .pm = serial_hsu_pm, | |
1223 | .type = serial_hsu_type, | |
1224 | .release_port = serial_hsu_release_port, | |
1225 | .request_port = serial_hsu_request_port, | |
1226 | .config_port = serial_hsu_config_port, | |
1227 | .verify_port = serial_hsu_verify_port, | |
1228 | }; | |
1229 | ||
1230 | static struct uart_driver serial_hsu_reg = { | |
1231 | .owner = THIS_MODULE, | |
1232 | .driver_name = "MFD serial", | |
1233 | .dev_name = "ttyMFD", | |
1234 | .major = TTY_MAJOR, | |
1235 | .minor = 128, | |
1236 | .nr = 3, | |
1237 | }; | |
1238 | ||
1239 | #ifdef CONFIG_PM | |
1240 | static int serial_hsu_suspend(struct pci_dev *pdev, pm_message_t state) | |
1241 | { | |
3c4108c8 | 1242 | void *priv = pci_get_drvdata(pdev); |
d843fc6e FT |
1243 | struct uart_hsu_port *up; |
1244 | ||
3c4108c8 FT |
1245 | /* Make sure this is not the internal dma controller */ |
1246 | if (priv && (pdev->device != 0x081E)) { | |
1247 | up = priv; | |
1248 | uart_suspend_port(&serial_hsu_reg, &up->port); | |
1249 | } | |
d843fc6e | 1250 | |
3c4108c8 FT |
1251 | pci_save_state(pdev); |
1252 | pci_set_power_state(pdev, pci_choose_state(pdev, state)); | |
d843fc6e FT |
1253 | return 0; |
1254 | } | |
1255 | ||
1256 | static int serial_hsu_resume(struct pci_dev *pdev) | |
1257 | { | |
3c4108c8 | 1258 | void *priv = pci_get_drvdata(pdev); |
d843fc6e | 1259 | struct uart_hsu_port *up; |
3c4108c8 | 1260 | int ret; |
d843fc6e | 1261 | |
3c4108c8 FT |
1262 | pci_set_power_state(pdev, PCI_D0); |
1263 | pci_restore_state(pdev); | |
1264 | ||
1265 | ret = pci_enable_device(pdev); | |
1266 | if (ret) | |
1267 | dev_warn(&pdev->dev, | |
1268 | "HSU: can't re-enable device, try to continue\n"); | |
1269 | ||
1270 | if (priv && (pdev->device != 0x081E)) { | |
1271 | up = priv; | |
1272 | uart_resume_port(&serial_hsu_reg, &up->port); | |
1273 | } | |
d843fc6e FT |
1274 | return 0; |
1275 | } | |
1276 | #else | |
1277 | #define serial_hsu_suspend NULL | |
1278 | #define serial_hsu_resume NULL | |
1279 | #endif | |
1280 | ||
1281 | /* temp global pointer before we settle down on using one or four PCI dev */ | |
1282 | static struct hsu_port *phsu; | |
1283 | ||
1284 | static int serial_hsu_probe(struct pci_dev *pdev, | |
1285 | const struct pci_device_id *ent) | |
1286 | { | |
1287 | struct uart_hsu_port *uport; | |
1288 | int index, ret; | |
1289 | ||
1290 | printk(KERN_INFO "HSU: found PCI Serial controller(ID: %04x:%04x)\n", | |
1291 | pdev->vendor, pdev->device); | |
1292 | ||
1293 | switch (pdev->device) { | |
1294 | case 0x081B: | |
1295 | index = 0; | |
1296 | break; | |
1297 | case 0x081C: | |
1298 | index = 1; | |
1299 | break; | |
1300 | case 0x081D: | |
1301 | index = 2; | |
1302 | break; | |
1303 | case 0x081E: | |
1304 | /* internal DMA controller */ | |
1305 | index = 3; | |
1306 | break; | |
1307 | default: | |
1308 | dev_err(&pdev->dev, "HSU: out of index!"); | |
1309 | return -ENODEV; | |
1310 | } | |
1311 | ||
1312 | ret = pci_enable_device(pdev); | |
1313 | if (ret) | |
1314 | return ret; | |
1315 | ||
1316 | if (index == 3) { | |
1317 | /* DMA controller */ | |
1318 | ret = request_irq(pdev->irq, dma_irq, 0, "hsu_dma", phsu); | |
1319 | if (ret) { | |
1320 | dev_err(&pdev->dev, "can not get IRQ\n"); | |
1321 | goto err_disable; | |
1322 | } | |
1323 | pci_set_drvdata(pdev, phsu); | |
1324 | } else { | |
1325 | /* UART port 0~2 */ | |
1326 | uport = &phsu->port[index]; | |
1327 | uport->port.irq = pdev->irq; | |
1328 | uport->port.dev = &pdev->dev; | |
1329 | uport->dev = &pdev->dev; | |
1330 | ||
1331 | ret = request_irq(pdev->irq, port_irq, 0, uport->name, uport); | |
1332 | if (ret) { | |
1333 | dev_err(&pdev->dev, "can not get IRQ\n"); | |
1334 | goto err_disable; | |
1335 | } | |
1336 | uart_add_one_port(&serial_hsu_reg, &uport->port); | |
1337 | ||
1338 | #ifdef CONFIG_SERIAL_MFD_HSU_CONSOLE | |
1339 | if (index == 2) { | |
1340 | register_console(&serial_hsu_console); | |
1341 | uport->port.cons = &serial_hsu_console; | |
1342 | } | |
1343 | #endif | |
1344 | pci_set_drvdata(pdev, uport); | |
1345 | } | |
1346 | ||
1347 | return 0; | |
1348 | ||
1349 | err_disable: | |
1350 | pci_disable_device(pdev); | |
1351 | return ret; | |
1352 | } | |
1353 | ||
669b7a09 FT |
1354 | static void hsu_dma_rx_timeout(unsigned long data) |
1355 | { | |
1356 | struct hsu_dma_chan *chan = (void *)data; | |
1357 | struct uart_hsu_port *up = chan->uport; | |
1358 | struct hsu_dma_buffer *dbuf = &up->rxbuf; | |
1359 | int count = 0; | |
1360 | unsigned long flags; | |
1361 | ||
1362 | spin_lock_irqsave(&up->port.lock, flags); | |
1363 | ||
1364 | count = chan_readl(chan, HSU_CH_D0SAR) - dbuf->dma_addr; | |
1365 | ||
1366 | if (!count) { | |
1367 | mod_timer(&chan->rx_timer, jiffies + HSU_DMA_TIMEOUT_CHECK_FREQ); | |
1368 | goto exit; | |
1369 | } | |
1370 | ||
1371 | hsu_dma_rx(up, 0); | |
1372 | exit: | |
1373 | spin_unlock_irqrestore(&up->port.lock, flags); | |
1374 | } | |
1375 | ||
d843fc6e FT |
1376 | static void hsu_global_init(void) |
1377 | { | |
1378 | struct hsu_port *hsu; | |
1379 | struct uart_hsu_port *uport; | |
1380 | struct hsu_dma_chan *dchan; | |
1381 | int i, ret; | |
1382 | ||
1383 | hsu = kzalloc(sizeof(struct hsu_port), GFP_KERNEL); | |
1384 | if (!hsu) | |
1385 | return; | |
1386 | ||
1387 | /* Get basic io resource and map it */ | |
1388 | hsu->paddr = 0xffa28000; | |
1389 | hsu->iolen = 0x1000; | |
1390 | ||
1391 | if (!(request_mem_region(hsu->paddr, hsu->iolen, "HSU global"))) | |
1392 | pr_warning("HSU: error in request mem region\n"); | |
1393 | ||
1394 | hsu->reg = ioremap_nocache((unsigned long)hsu->paddr, hsu->iolen); | |
1395 | if (!hsu->reg) { | |
1396 | pr_err("HSU: error in ioremap\n"); | |
1397 | ret = -ENOMEM; | |
1398 | goto err_free_region; | |
1399 | } | |
1400 | ||
1401 | /* Initialise the 3 UART ports */ | |
1402 | uport = hsu->port; | |
1403 | for (i = 0; i < 3; i++) { | |
1404 | uport->port.type = PORT_MFD; | |
1405 | uport->port.iotype = UPIO_MEM; | |
1406 | uport->port.mapbase = (resource_size_t)hsu->paddr | |
1407 | + HSU_PORT_REG_OFFSET | |
1408 | + i * HSU_PORT_REG_LENGTH; | |
1409 | uport->port.membase = hsu->reg + HSU_PORT_REG_OFFSET | |
1410 | + i * HSU_PORT_REG_LENGTH; | |
1411 | ||
1412 | sprintf(uport->name, "hsu_port%d", i); | |
1413 | uport->port.fifosize = 64; | |
1414 | uport->port.ops = &serial_hsu_pops; | |
1415 | uport->port.line = i; | |
1416 | uport->port.flags = UPF_IOREMAP; | |
06c77e21 | 1417 | /* set the scalable maxim support rate to 2746800 bps */ |
d843fc6e FT |
1418 | uport->port.uartclk = 115200 * 24 * 16; |
1419 | ||
1420 | uport->running = 0; | |
1421 | uport->txc = &hsu->chans[i * 2]; | |
1422 | uport->rxc = &hsu->chans[i * 2 + 1]; | |
1423 | ||
1424 | serial_hsu_ports[i] = uport; | |
1425 | uport->index = i; | |
1426 | uport++; | |
1427 | } | |
1428 | ||
1429 | /* Initialise 6 dma channels */ | |
1430 | dchan = hsu->chans; | |
1431 | for (i = 0; i < 6; i++) { | |
1432 | dchan->id = i; | |
1433 | dchan->dirt = (i & 0x1) ? DMA_FROM_DEVICE : DMA_TO_DEVICE; | |
1434 | dchan->uport = &hsu->port[i/2]; | |
1435 | dchan->reg = hsu->reg + HSU_DMA_CHANS_REG_OFFSET + | |
1436 | i * HSU_DMA_CHANS_REG_LENGTH; | |
669b7a09 FT |
1437 | |
1438 | /* Work around for RX */ | |
1439 | if (dchan->dirt == DMA_FROM_DEVICE) { | |
1440 | init_timer(&dchan->rx_timer); | |
1441 | dchan->rx_timer.function = hsu_dma_rx_timeout; | |
1442 | dchan->rx_timer.data = (unsigned long)dchan; | |
1443 | } | |
d843fc6e FT |
1444 | dchan++; |
1445 | } | |
1446 | ||
1447 | phsu = hsu; | |
d843fc6e FT |
1448 | hsu_debugfs_init(hsu); |
1449 | return; | |
1450 | ||
1451 | err_free_region: | |
1452 | release_mem_region(hsu->paddr, hsu->iolen); | |
1453 | kfree(hsu); | |
1454 | return; | |
1455 | } | |
1456 | ||
1457 | static void serial_hsu_remove(struct pci_dev *pdev) | |
1458 | { | |
e3671ac4 FT |
1459 | void *priv = pci_get_drvdata(pdev); |
1460 | struct uart_hsu_port *up; | |
d843fc6e | 1461 | |
e3671ac4 | 1462 | if (!priv) |
d843fc6e FT |
1463 | return; |
1464 | ||
e3671ac4 FT |
1465 | /* For port 0/1/2, priv is the address of uart_hsu_port */ |
1466 | if (pdev->device != 0x081E) { | |
1467 | up = priv; | |
1468 | uart_remove_one_port(&serial_hsu_reg, &up->port); | |
1469 | } | |
d843fc6e FT |
1470 | |
1471 | pci_set_drvdata(pdev, NULL); | |
e3671ac4 | 1472 | free_irq(pdev->irq, priv); |
d843fc6e FT |
1473 | pci_disable_device(pdev); |
1474 | } | |
1475 | ||
1476 | /* First 3 are UART ports, and the 4th is the DMA */ | |
1477 | static const struct pci_device_id pci_ids[] __devinitdata = { | |
1478 | { PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0x081B) }, | |
1479 | { PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0x081C) }, | |
1480 | { PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0x081D) }, | |
1481 | { PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0x081E) }, | |
1482 | {}, | |
1483 | }; | |
1484 | ||
1485 | static struct pci_driver hsu_pci_driver = { | |
1486 | .name = "HSU serial", | |
1487 | .id_table = pci_ids, | |
1488 | .probe = serial_hsu_probe, | |
1489 | .remove = __devexit_p(serial_hsu_remove), | |
1490 | .suspend = serial_hsu_suspend, | |
1491 | .resume = serial_hsu_resume, | |
1492 | }; | |
1493 | ||
1494 | static int __init hsu_pci_init(void) | |
1495 | { | |
1496 | int ret; | |
1497 | ||
1498 | hsu_global_init(); | |
1499 | ||
1500 | ret = uart_register_driver(&serial_hsu_reg); | |
1501 | if (ret) | |
1502 | return ret; | |
1503 | ||
1504 | return pci_register_driver(&hsu_pci_driver); | |
1505 | } | |
1506 | ||
1507 | static void __exit hsu_pci_exit(void) | |
1508 | { | |
1509 | pci_unregister_driver(&hsu_pci_driver); | |
1510 | uart_unregister_driver(&serial_hsu_reg); | |
1511 | ||
1512 | hsu_debugfs_remove(phsu); | |
1513 | ||
1514 | kfree(phsu); | |
1515 | } | |
1516 | ||
1517 | module_init(hsu_pci_init); | |
1518 | module_exit(hsu_pci_exit); | |
1519 | ||
1520 | MODULE_LICENSE("GPL v2"); | |
1521 | MODULE_ALIAS("platform:medfield-hsu"); |