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7#include <linux/bitops.h>
8#include <linux/log2.h>
9#include <linux/hrtimer.h>
10struct sirfsoc_uart_param {
11 const char *uart_name;
12 const char *port_name;
13};
14
15struct sirfsoc_register {
16
17 u32 sirfsoc_line_ctrl;
18 u32 sirfsoc_divisor;
19
20 u32 sirfsoc_tx_rx_en;
21 u32 sirfsoc_int_en_reg;
22 u32 sirfsoc_int_st_reg;
23 u32 sirfsoc_int_en_clr_reg;
24 u32 sirfsoc_tx_dma_io_ctrl;
25 u32 sirfsoc_tx_dma_io_len;
26 u32 sirfsoc_tx_fifo_ctrl;
27 u32 sirfsoc_tx_fifo_level_chk;
28 u32 sirfsoc_tx_fifo_op;
29 u32 sirfsoc_tx_fifo_status;
30 u32 sirfsoc_tx_fifo_data;
31 u32 sirfsoc_rx_dma_io_ctrl;
32 u32 sirfsoc_rx_dma_io_len;
33 u32 sirfsoc_rx_fifo_ctrl;
34 u32 sirfsoc_rx_fifo_level_chk;
35 u32 sirfsoc_rx_fifo_op;
36 u32 sirfsoc_rx_fifo_status;
37 u32 sirfsoc_rx_fifo_data;
38 u32 sirfsoc_afc_ctrl;
39 u32 sirfsoc_swh_dma_io;
40
41 u32 sirfsoc_mode1;
42 u32 sirfsoc_mode2;
43 u32 sirfsoc_tx_frame_ctrl;
44 u32 sirfsoc_rx_frame_ctrl;
45 u32 sirfsoc_async_param_reg;
46};
47
48typedef u32 (*fifo_full_mask)(struct uart_port *port);
49typedef u32 (*fifo_empty_mask)(struct uart_port *port);
50
51struct sirfsoc_fifo_status {
52 fifo_full_mask ff_full;
53 fifo_empty_mask ff_empty;
54};
55
56struct sirfsoc_int_en {
57 u32 sirfsoc_rx_done_en;
58 u32 sirfsoc_tx_done_en;
59 u32 sirfsoc_rx_oflow_en;
60 u32 sirfsoc_tx_allout_en;
61 u32 sirfsoc_rx_io_dma_en;
62 u32 sirfsoc_tx_io_dma_en;
63 u32 sirfsoc_rxfifo_full_en;
64 u32 sirfsoc_txfifo_empty_en;
65 u32 sirfsoc_rxfifo_thd_en;
66 u32 sirfsoc_txfifo_thd_en;
67 u32 sirfsoc_frm_err_en;
68 u32 sirfsoc_rxd_brk_en;
69 u32 sirfsoc_rx_timeout_en;
70 u32 sirfsoc_parity_err_en;
71 u32 sirfsoc_cts_en;
72 u32 sirfsoc_rts_en;
73};
74
75struct sirfsoc_int_status {
76 u32 sirfsoc_rx_done;
77 u32 sirfsoc_tx_done;
78 u32 sirfsoc_rx_oflow;
79 u32 sirfsoc_tx_allout;
80 u32 sirfsoc_rx_io_dma;
81 u32 sirfsoc_tx_io_dma;
82 u32 sirfsoc_rxfifo_full;
83 u32 sirfsoc_txfifo_empty;
84 u32 sirfsoc_rxfifo_thd;
85 u32 sirfsoc_txfifo_thd;
86 u32 sirfsoc_frm_err;
87 u32 sirfsoc_rxd_brk;
88 u32 sirfsoc_rx_timeout;
89 u32 sirfsoc_parity_err;
90 u32 sirfsoc_cts;
91 u32 sirfsoc_rts;
92};
93
94enum sirfsoc_uart_type {
95 SIRF_REAL_UART,
96 SIRF_USP_UART,
97};
98
99struct sirfsoc_uart_register {
100 struct sirfsoc_register uart_reg;
101 struct sirfsoc_int_en uart_int_en;
102 struct sirfsoc_int_status uart_int_st;
103 struct sirfsoc_fifo_status fifo_status;
104 struct sirfsoc_uart_param uart_param;
105 enum sirfsoc_uart_type uart_type;
106};
107
108static u32 uart_usp_ff_full_mask(struct uart_port *port)
109{
110 u32 full_bit;
111
112 full_bit = ilog2(port->fifosize);
113 return (1 << full_bit);
114}
115
116static u32 uart_usp_ff_empty_mask(struct uart_port *port)
117{
118 u32 empty_bit;
119
120 empty_bit = ilog2(port->fifosize) + 1;
121 return (1 << empty_bit);
122}
123
124static struct sirfsoc_uart_register sirfsoc_usp = {
125 .uart_reg = {
126 .sirfsoc_mode1 = 0x0000,
127 .sirfsoc_mode2 = 0x0004,
128 .sirfsoc_tx_frame_ctrl = 0x0008,
129 .sirfsoc_rx_frame_ctrl = 0x000c,
130 .sirfsoc_tx_rx_en = 0x0010,
131 .sirfsoc_int_en_reg = 0x0014,
132 .sirfsoc_int_st_reg = 0x0018,
133 .sirfsoc_async_param_reg = 0x0024,
134 .sirfsoc_tx_dma_io_ctrl = 0x0100,
135 .sirfsoc_tx_dma_io_len = 0x0104,
136 .sirfsoc_tx_fifo_ctrl = 0x0108,
137 .sirfsoc_tx_fifo_level_chk = 0x010c,
138 .sirfsoc_tx_fifo_op = 0x0110,
139 .sirfsoc_tx_fifo_status = 0x0114,
140 .sirfsoc_tx_fifo_data = 0x0118,
141 .sirfsoc_rx_dma_io_ctrl = 0x0120,
142 .sirfsoc_rx_dma_io_len = 0x0124,
143 .sirfsoc_rx_fifo_ctrl = 0x0128,
144 .sirfsoc_rx_fifo_level_chk = 0x012c,
145 .sirfsoc_rx_fifo_op = 0x0130,
146 .sirfsoc_rx_fifo_status = 0x0134,
147 .sirfsoc_rx_fifo_data = 0x0138,
148 .sirfsoc_int_en_clr_reg = 0x140,
149 },
150 .uart_int_en = {
151 .sirfsoc_rx_done_en = BIT(0),
152 .sirfsoc_tx_done_en = BIT(1),
153 .sirfsoc_rx_oflow_en = BIT(2),
154 .sirfsoc_tx_allout_en = BIT(3),
155 .sirfsoc_rx_io_dma_en = BIT(4),
156 .sirfsoc_tx_io_dma_en = BIT(5),
157 .sirfsoc_rxfifo_full_en = BIT(6),
158 .sirfsoc_txfifo_empty_en = BIT(7),
159 .sirfsoc_rxfifo_thd_en = BIT(8),
160 .sirfsoc_txfifo_thd_en = BIT(9),
161 .sirfsoc_frm_err_en = BIT(10),
162 .sirfsoc_rx_timeout_en = BIT(11),
163 .sirfsoc_rxd_brk_en = BIT(15),
164 },
165 .uart_int_st = {
166 .sirfsoc_rx_done = BIT(0),
167 .sirfsoc_tx_done = BIT(1),
168 .sirfsoc_rx_oflow = BIT(2),
169 .sirfsoc_tx_allout = BIT(3),
170 .sirfsoc_rx_io_dma = BIT(4),
171 .sirfsoc_tx_io_dma = BIT(5),
172 .sirfsoc_rxfifo_full = BIT(6),
173 .sirfsoc_txfifo_empty = BIT(7),
174 .sirfsoc_rxfifo_thd = BIT(8),
175 .sirfsoc_txfifo_thd = BIT(9),
176 .sirfsoc_frm_err = BIT(10),
177 .sirfsoc_rx_timeout = BIT(11),
178 .sirfsoc_rxd_brk = BIT(15),
179 },
180 .fifo_status = {
181 .ff_full = uart_usp_ff_full_mask,
182 .ff_empty = uart_usp_ff_empty_mask,
183 },
184 .uart_param = {
185 .uart_name = "ttySiRF",
186 .port_name = "sirfsoc-uart",
187 },
188};
189
190static struct sirfsoc_uart_register sirfsoc_uart = {
191 .uart_reg = {
192 .sirfsoc_line_ctrl = 0x0040,
193 .sirfsoc_tx_rx_en = 0x004c,
194 .sirfsoc_divisor = 0x0050,
195 .sirfsoc_int_en_reg = 0x0054,
196 .sirfsoc_int_st_reg = 0x0058,
197 .sirfsoc_int_en_clr_reg = 0x0060,
198 .sirfsoc_tx_dma_io_ctrl = 0x0100,
199 .sirfsoc_tx_dma_io_len = 0x0104,
200 .sirfsoc_tx_fifo_ctrl = 0x0108,
201 .sirfsoc_tx_fifo_level_chk = 0x010c,
202 .sirfsoc_tx_fifo_op = 0x0110,
203 .sirfsoc_tx_fifo_status = 0x0114,
204 .sirfsoc_tx_fifo_data = 0x0118,
205 .sirfsoc_rx_dma_io_ctrl = 0x0120,
206 .sirfsoc_rx_dma_io_len = 0x0124,
207 .sirfsoc_rx_fifo_ctrl = 0x0128,
208 .sirfsoc_rx_fifo_level_chk = 0x012c,
209 .sirfsoc_rx_fifo_op = 0x0130,
210 .sirfsoc_rx_fifo_status = 0x0134,
211 .sirfsoc_rx_fifo_data = 0x0138,
212 .sirfsoc_afc_ctrl = 0x0140,
213 .sirfsoc_swh_dma_io = 0x0148,
214 },
215 .uart_int_en = {
216 .sirfsoc_rx_done_en = BIT(0),
217 .sirfsoc_tx_done_en = BIT(1),
218 .sirfsoc_rx_oflow_en = BIT(2),
219 .sirfsoc_tx_allout_en = BIT(3),
220 .sirfsoc_rx_io_dma_en = BIT(4),
221 .sirfsoc_tx_io_dma_en = BIT(5),
222 .sirfsoc_rxfifo_full_en = BIT(6),
223 .sirfsoc_txfifo_empty_en = BIT(7),
224 .sirfsoc_rxfifo_thd_en = BIT(8),
225 .sirfsoc_txfifo_thd_en = BIT(9),
226 .sirfsoc_frm_err_en = BIT(10),
227 .sirfsoc_rxd_brk_en = BIT(11),
228 .sirfsoc_rx_timeout_en = BIT(12),
229 .sirfsoc_parity_err_en = BIT(13),
230 .sirfsoc_cts_en = BIT(14),
231 .sirfsoc_rts_en = BIT(15),
232 },
233 .uart_int_st = {
234 .sirfsoc_rx_done = BIT(0),
235 .sirfsoc_tx_done = BIT(1),
236 .sirfsoc_rx_oflow = BIT(2),
237 .sirfsoc_tx_allout = BIT(3),
238 .sirfsoc_rx_io_dma = BIT(4),
239 .sirfsoc_tx_io_dma = BIT(5),
240 .sirfsoc_rxfifo_full = BIT(6),
241 .sirfsoc_txfifo_empty = BIT(7),
242 .sirfsoc_rxfifo_thd = BIT(8),
243 .sirfsoc_txfifo_thd = BIT(9),
244 .sirfsoc_frm_err = BIT(10),
245 .sirfsoc_rxd_brk = BIT(11),
246 .sirfsoc_rx_timeout = BIT(12),
247 .sirfsoc_parity_err = BIT(13),
248 .sirfsoc_cts = BIT(14),
249 .sirfsoc_rts = BIT(15),
250 },
251 .fifo_status = {
252 .ff_full = uart_usp_ff_full_mask,
253 .ff_empty = uart_usp_ff_empty_mask,
254 },
255 .uart_param = {
256 .uart_name = "ttySiRF",
257 .port_name = "sirfsoc_uart",
258 },
259};
260
261#define SIRFUART_DATA_BIT_LEN_MASK 0x3
262#define SIRFUART_DATA_BIT_LEN_5 BIT(0)
263#define SIRFUART_DATA_BIT_LEN_6 1
264#define SIRFUART_DATA_BIT_LEN_7 2
265#define SIRFUART_DATA_BIT_LEN_8 3
266#define SIRFUART_STOP_BIT_LEN_1 0
267#define SIRFUART_STOP_BIT_LEN_2 BIT(2)
268#define SIRFUART_PARITY_EN BIT(3)
269#define SIRFUART_EVEN_BIT BIT(4)
270#define SIRFUART_STICK_BIT_MASK (7 << 3)
271#define SIRFUART_STICK_BIT_NONE (0 << 3)
272#define SIRFUART_STICK_BIT_EVEN BIT(3)
273#define SIRFUART_STICK_BIT_ODD (3 << 3)
274#define SIRFUART_STICK_BIT_MARK (5 << 3)
275#define SIRFUART_STICK_BIT_SPACE (7 << 3)
276#define SIRFUART_SET_BREAK BIT(6)
277#define SIRFUART_LOOP_BACK BIT(7)
278#define SIRFUART_PARITY_MASK (7 << 3)
279#define SIRFUART_DUMMY_READ BIT(16)
280#define SIRFUART_AFC_CTRL_RX_THD 0x70
281#define SIRFUART_AFC_RX_EN BIT(8)
282#define SIRFUART_AFC_TX_EN BIT(9)
283#define SIRFUART_AFC_CTS_CTRL BIT(10)
284#define SIRFUART_AFC_RTS_CTRL BIT(11)
285#define SIRFUART_AFC_CTS_STATUS BIT(12)
286#define SIRFUART_AFC_RTS_STATUS BIT(13)
287
288#define SIRFUART_FIFO_STOP 0x0
289#define SIRFUART_FIFO_RESET BIT(0)
290#define SIRFUART_FIFO_START BIT(1)
291
292#define SIRFUART_RX_EN BIT(0)
293#define SIRFUART_TX_EN BIT(1)
294
295#define SIRFUART_IO_MODE BIT(0)
296#define SIRFUART_DMA_MODE 0x0
297#define SIRFUART_RX_DMA_FLUSH 0x4
298
299#define SIRFUART_CLEAR_RX_ADDR_EN 0x2
300
301#define SIRF_USP_MIN_SAMPLE_DIV 0x1
302#define SIRF_MIN_SAMPLE_DIV 0xf
303#define SIRF_MAX_SAMPLE_DIV 0x3f
304#define SIRF_IOCLK_DIV_MAX 0xffff
305#define SIRF_SAMPLE_DIV_SHIFT 16
306#define SIRF_IOCLK_DIV_MASK 0xffff
307#define SIRF_SAMPLE_DIV_MASK 0x3f0000
308#define SIRF_BAUD_RATE_SUPPORT_NR 18
309
310
311#define SIRFSOC_USP_ENDIAN_CTRL_LSBF BIT(4)
312#define SIRFSOC_USP_EN BIT(5)
313#define SIRFSOC_USP_MODE2_RXD_DELAY_OFFSET 0
314#define SIRFSOC_USP_MODE2_TXD_DELAY_OFFSET 8
315#define SIRFSOC_USP_MODE2_CLK_DIVISOR_MASK 0x3ff
316#define SIRFSOC_USP_MODE2_CLK_DIVISOR_OFFSET 21
317#define SIRFSOC_USP_TX_DATA_LEN_OFFSET 0
318#define SIRFSOC_USP_TX_SYNC_LEN_OFFSET 8
319#define SIRFSOC_USP_TX_FRAME_LEN_OFFSET 16
320#define SIRFSOC_USP_TX_SHIFTER_LEN_OFFSET 24
321#define SIRFSOC_USP_TX_CLK_DIVISOR_OFFSET 30
322#define SIRFSOC_USP_RX_DATA_LEN_OFFSET 0
323#define SIRFSOC_USP_RX_FRAME_LEN_OFFSET 8
324#define SIRFSOC_USP_RX_SHIFTER_LEN_OFFSET 16
325#define SIRFSOC_USP_RX_CLK_DIVISOR_OFFSET 24
326#define SIRFSOC_USP_ASYNC_DIV2_MASK 0x3f
327#define SIRFSOC_USP_ASYNC_DIV2_OFFSET 16
328#define SIRFSOC_USP_LOOP_BACK_CTRL BIT(2)
329#define SIRFSOC_USP_FRADDR_CLR_EN BIT(1)
330
331#define SIRFSOC_UART_RX_TIMEOUT(br, to) (((br) * (((to) + 999) / 1000)) / 1000)
332#define SIRFUART_RECV_TIMEOUT_VALUE(x) \
333 (((x) > 0xFFFF) ? 0xFFFF : ((x) & 0xFFFF))
334#define SIRFUART_USP_RECV_TIMEOUT(x) (x & 0xFFFF)
335#define SIRFUART_UART_RECV_TIMEOUT(x) ((x & 0xFFFF) << 16)
336
337#define SIRFUART_FIFO_THD(port) (port->fifosize >> 1)
338#define SIRFUART_ERR_INT_STAT(unit_st, uart_type) \
339 (uint_st->sirfsoc_rx_oflow | \
340 uint_st->sirfsoc_frm_err | \
341 uint_st->sirfsoc_rxd_brk | \
342 ((uart_type != SIRF_REAL_UART) ? \
343 0 : uint_st->sirfsoc_parity_err))
344#define SIRFUART_RX_IO_INT_EN(uint_en, uart_type) \
345 (uint_en->sirfsoc_rx_done_en |\
346 uint_en->sirfsoc_rxfifo_thd_en |\
347 uint_en->sirfsoc_rxfifo_full_en |\
348 uint_en->sirfsoc_frm_err_en |\
349 uint_en->sirfsoc_rx_oflow_en |\
350 uint_en->sirfsoc_rxd_brk_en |\
351 ((uart_type != SIRF_REAL_UART) ? \
352 0 : uint_en->sirfsoc_parity_err_en))
353#define SIRFUART_RX_IO_INT_ST(uint_st) \
354 (uint_st->sirfsoc_rxfifo_thd |\
355 uint_st->sirfsoc_rxfifo_full|\
356 uint_st->sirfsoc_rx_done |\
357 uint_st->sirfsoc_rx_timeout)
358#define SIRFUART_CTS_INT_ST(uint_st) (uint_st->sirfsoc_cts)
359#define SIRFUART_RX_DMA_INT_EN(uint_en, uart_type) \
360 (uint_en->sirfsoc_frm_err_en |\
361 uint_en->sirfsoc_rx_oflow_en |\
362 uint_en->sirfsoc_rxd_brk_en |\
363 ((uart_type != SIRF_REAL_UART) ? \
364 0 : uint_en->sirfsoc_parity_err_en))
365
366#define SIRFSOC_UART_NAME "ttySiRF"
367#define SIRFSOC_UART_MAJOR 0
368#define SIRFSOC_UART_MINOR 0
369#define SIRFUART_PORT_NAME "sirfsoc-uart"
370#define SIRFUART_MAP_SIZE 0x200
371#define SIRFSOC_UART_NR 11
372#define SIRFSOC_PORT_TYPE 0xa5
373
374
375#define SIRFSOC_RX_DMA_BUF_SIZE (1024 * 32)
376#define BYTES_TO_ALIGN(dma_addr) ((unsigned long)(dma_addr) & 0x3)
377
378#define SIRFUART_TX_FIFO_SC_OFFSET 0
379#define SIRFUART_TX_FIFO_LC_OFFSET 10
380#define SIRFUART_TX_FIFO_HC_OFFSET 20
381#define SIRFUART_TX_FIFO_CHK_SC(line, value) ((((line) == 1) ? (value & 0x3) :\
382 (value & 0x1f)) << SIRFUART_TX_FIFO_SC_OFFSET)
383#define SIRFUART_TX_FIFO_CHK_LC(line, value) ((((line) == 1) ? (value & 0x3) :\
384 (value & 0x1f)) << SIRFUART_TX_FIFO_LC_OFFSET)
385#define SIRFUART_TX_FIFO_CHK_HC(line, value) ((((line) == 1) ? (value & 0x3) :\
386 (value & 0x1f)) << SIRFUART_TX_FIFO_HC_OFFSET)
387
388#define SIRFUART_RX_FIFO_CHK_SC SIRFUART_TX_FIFO_CHK_SC
389#define SIRFUART_RX_FIFO_CHK_LC SIRFUART_TX_FIFO_CHK_LC
390#define SIRFUART_RX_FIFO_CHK_HC SIRFUART_TX_FIFO_CHK_HC
391#define SIRFUART_RX_FIFO_MASK 0x7f
392
393
394
395struct sirfsoc_baudrate_to_regv {
396 unsigned int baud_rate;
397 unsigned int reg_val;
398};
399
400enum sirfsoc_tx_state {
401 TX_DMA_IDLE,
402 TX_DMA_RUNNING,
403 TX_DMA_PAUSE,
404};
405
406struct sirfsoc_rx_buffer {
407 struct circ_buf xmit;
408 dma_cookie_t cookie;
409 struct dma_async_tx_descriptor *desc;
410 dma_addr_t dma_addr;
411};
412
413struct sirfsoc_uart_port {
414 bool hw_flow_ctrl;
415 bool ms_enabled;
416
417 struct uart_port port;
418 struct clk *clk;
419
420 bool is_atlas7;
421 struct sirfsoc_uart_register *uart_reg;
422 struct dma_chan *rx_dma_chan;
423 struct dma_chan *tx_dma_chan;
424 dma_addr_t tx_dma_addr;
425 struct dma_async_tx_descriptor *tx_dma_desc;
426 unsigned long transfer_size;
427 enum sirfsoc_tx_state tx_dma_state;
428 unsigned int cts_gpio;
429 unsigned int rts_gpio;
430
431 struct sirfsoc_rx_buffer rx_dma_items;
432 struct hrtimer hrt;
433 bool is_hrt_enabled;
434 unsigned long rx_period_time;
435 unsigned long rx_last_pos;
436 unsigned long pio_fetch_cnt;
437};
438
439
440#define portaddr(port, reg) ((port)->membase + (reg))
441#define rd_regl(port, reg) (__raw_readl(portaddr(port, reg)))
442#define wr_regl(port, reg, val) __raw_writel(val, portaddr(port, reg))
443
444
445#define SIRFUART_FIFOLEVEL_MASK(port) ((port->fifosize - 1) & 0xFFF)
446#define SIRFUART_FIFOFULL_MASK(port) (port->fifosize & 0xFFF)
447#define SIRFUART_FIFOEMPTY_MASK(port) ((port->fifosize & 0xFFF) << 1)
448
