Commit | Line | Data |
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1da177e4 | 1 | /* |
1da177e4 LT |
2 | * Bootloader version of the embedded MPSC/UART driver for the Marvell 64x60. |
3 | * Note: Due to a GT64260A erratum, DMA will be used for UART input (via SDMA). | |
4 | * | |
5 | * Author: Mark A. Greer <mgreer@mvista.com> | |
6 | * | |
7 | * 2001 (c) MontaVista Software, Inc. This file is licensed under | |
8 | * the terms of the GNU General Public License version 2. This program | |
9 | * is licensed "as is" without any warranty of any kind, whether express | |
10 | * or implied. | |
11 | */ | |
12 | ||
13 | /* This code assumes that the data cache has been disabled (L1, L2, L3). */ | |
14 | ||
15 | #include <linux/config.h> | |
16 | #include <linux/types.h> | |
17 | #include <linux/serial_reg.h> | |
18 | #include <asm/serial.h> | |
19 | #include <asm/io.h> | |
20 | #include <asm/mv64x60_defs.h> | |
21 | #include <mpsc_defs.h> | |
22 | ||
3acb2344 LN |
23 | #ifdef CONFIG_EV64360 |
24 | #include <platforms/ev64360.h> | |
25 | u32 mv64x60_console_baud = EV64360_DEFAULT_BAUD; | |
26 | u32 mv64x60_mpsc_clk_src = EV64360_MPSC_CLK_SRC; /* TCLK */ | |
27 | u32 mv64x60_mpsc_clk_freq = EV64360_MPSC_CLK_FREQ; | |
28 | #else | |
1da177e4 LT |
29 | u32 mv64x60_console_baud = 9600; |
30 | u32 mv64x60_mpsc_clk_src = 8; /* TCLK */ | |
31 | u32 mv64x60_mpsc_clk_freq = 100000000; | |
3acb2344 | 32 | #endif |
1da177e4 LT |
33 | |
34 | extern void udelay(long); | |
35 | static void stop_dma(int chan); | |
36 | ||
37 | static void __iomem *mv64x60_base = (void __iomem *)CONFIG_MV64X60_NEW_BASE; | |
38 | ||
39 | struct sdma_regs { | |
40 | u32 sdc; | |
41 | u32 sdcm; | |
42 | u32 rx_desc; | |
43 | u32 rx_buf_ptr; | |
44 | u32 scrdp; | |
45 | u32 tx_desc; | |
46 | u32 sctdp; | |
47 | u32 sftdp; | |
48 | }; | |
49 | ||
50 | static struct sdma_regs sdma_regs[2]; | |
51 | ||
52 | #define SDMA_REGS_INIT(s, reg_base) { \ | |
53 | (s)->sdc = (reg_base) + SDMA_SDC; \ | |
54 | (s)->sdcm = (reg_base) + SDMA_SDCM; \ | |
55 | (s)->rx_desc = (reg_base) + SDMA_RX_DESC; \ | |
56 | (s)->rx_buf_ptr = (reg_base) + SDMA_RX_BUF_PTR; \ | |
57 | (s)->scrdp = (reg_base) + SDMA_SCRDP; \ | |
58 | (s)->tx_desc = (reg_base) + SDMA_TX_DESC; \ | |
59 | (s)->sctdp = (reg_base) + SDMA_SCTDP; \ | |
60 | (s)->sftdp = (reg_base) + SDMA_SFTDP; \ | |
61 | } | |
62 | ||
63 | static u32 mpsc_base[2] = { MV64x60_MPSC_0_OFFSET, MV64x60_MPSC_1_OFFSET }; | |
64 | ||
65 | struct mv64x60_rx_desc { | |
66 | u16 bufsize; | |
67 | u16 bytecnt; | |
68 | u32 cmd_stat; | |
69 | u32 next_desc_ptr; | |
70 | u32 buffer; | |
71 | }; | |
72 | ||
73 | struct mv64x60_tx_desc { | |
74 | u16 bytecnt; | |
75 | u16 shadow; | |
76 | u32 cmd_stat; | |
77 | u32 next_desc_ptr; | |
78 | u32 buffer; | |
79 | }; | |
80 | ||
81 | #define MAX_RESET_WAIT 10000 | |
82 | #define MAX_TX_WAIT 10000 | |
83 | ||
84 | #define RX_NUM_DESC 2 | |
85 | #define TX_NUM_DESC 2 | |
86 | ||
87 | #define RX_BUF_SIZE 32 | |
88 | #define TX_BUF_SIZE 32 | |
89 | ||
90 | static struct mv64x60_rx_desc rd[2][RX_NUM_DESC] __attribute__ ((aligned(32))); | |
91 | static struct mv64x60_tx_desc td[2][TX_NUM_DESC] __attribute__ ((aligned(32))); | |
92 | ||
93 | static char rx_buf[2][RX_NUM_DESC * RX_BUF_SIZE] __attribute__ ((aligned(32))); | |
94 | static char tx_buf[2][TX_NUM_DESC * TX_BUF_SIZE] __attribute__ ((aligned(32))); | |
95 | ||
96 | static int cur_rd[2] = { 0, 0 }; | |
97 | static int cur_td[2] = { 0, 0 }; | |
98 | ||
99 | static char chan_initialized[2] = { 0, 0 }; | |
100 | ||
101 | ||
102 | #define RX_INIT_RDP(rdp) { \ | |
103 | (rdp)->bufsize = 2; \ | |
104 | (rdp)->bytecnt = 0; \ | |
105 | (rdp)->cmd_stat = SDMA_DESC_CMDSTAT_L | SDMA_DESC_CMDSTAT_F | \ | |
106 | SDMA_DESC_CMDSTAT_O; \ | |
107 | } | |
108 | ||
109 | #ifdef CONFIG_MV64360 | |
110 | static u32 cpu2mem_tab[MV64x60_CPU2MEM_WINDOWS][2] = { | |
111 | { MV64x60_CPU2MEM_0_BASE, MV64x60_CPU2MEM_0_SIZE }, | |
112 | { MV64x60_CPU2MEM_1_BASE, MV64x60_CPU2MEM_1_SIZE }, | |
113 | { MV64x60_CPU2MEM_2_BASE, MV64x60_CPU2MEM_2_SIZE }, | |
114 | { MV64x60_CPU2MEM_3_BASE, MV64x60_CPU2MEM_3_SIZE } | |
115 | }; | |
116 | ||
117 | static u32 com2mem_tab[MV64x60_CPU2MEM_WINDOWS][2] = { | |
118 | { MV64360_MPSC2MEM_0_BASE, MV64360_MPSC2MEM_0_SIZE }, | |
119 | { MV64360_MPSC2MEM_1_BASE, MV64360_MPSC2MEM_1_SIZE }, | |
120 | { MV64360_MPSC2MEM_2_BASE, MV64360_MPSC2MEM_2_SIZE }, | |
121 | { MV64360_MPSC2MEM_3_BASE, MV64360_MPSC2MEM_3_SIZE } | |
122 | }; | |
123 | ||
124 | static u32 dram_selects[MV64x60_CPU2MEM_WINDOWS] = { 0xe, 0xd, 0xb, 0x7 }; | |
125 | #endif | |
126 | ||
127 | unsigned long | |
128 | serial_init(int chan, void *ignored) | |
129 | { | |
130 | u32 mpsc_routing_base, sdma_base, brg_bcr, cdv; | |
131 | int i; | |
132 | ||
133 | chan = (chan == 1); /* default to chan 0 if anything but 1 */ | |
134 | ||
135 | if (chan_initialized[chan]) | |
136 | return chan; | |
137 | ||
138 | chan_initialized[chan] = 1; | |
139 | ||
140 | if (chan == 0) { | |
141 | sdma_base = MV64x60_SDMA_0_OFFSET; | |
142 | brg_bcr = MV64x60_BRG_0_OFFSET + BRG_BCR; | |
143 | SDMA_REGS_INIT(&sdma_regs[0], MV64x60_SDMA_0_OFFSET); | |
144 | } else { | |
145 | sdma_base = MV64x60_SDMA_1_OFFSET; | |
146 | brg_bcr = MV64x60_BRG_1_OFFSET + BRG_BCR; | |
147 | SDMA_REGS_INIT(&sdma_regs[0], MV64x60_SDMA_1_OFFSET); | |
148 | } | |
149 | ||
150 | mpsc_routing_base = MV64x60_MPSC_ROUTING_OFFSET; | |
151 | ||
152 | stop_dma(chan); | |
153 | ||
154 | /* Set up ring buffers */ | |
155 | for (i=0; i<RX_NUM_DESC; i++) { | |
156 | RX_INIT_RDP(&rd[chan][i]); | |
157 | rd[chan][i].buffer = (u32)&rx_buf[chan][i * RX_BUF_SIZE]; | |
158 | rd[chan][i].next_desc_ptr = (u32)&rd[chan][i+1]; | |
159 | } | |
160 | rd[chan][RX_NUM_DESC - 1].next_desc_ptr = (u32)&rd[chan][0]; | |
161 | ||
162 | for (i=0; i<TX_NUM_DESC; i++) { | |
163 | td[chan][i].bytecnt = 0; | |
164 | td[chan][i].shadow = 0; | |
165 | td[chan][i].buffer = (u32)&tx_buf[chan][i * TX_BUF_SIZE]; | |
166 | td[chan][i].cmd_stat = SDMA_DESC_CMDSTAT_F|SDMA_DESC_CMDSTAT_L; | |
167 | td[chan][i].next_desc_ptr = (u32)&td[chan][i+1]; | |
168 | } | |
169 | td[chan][TX_NUM_DESC - 1].next_desc_ptr = (u32)&td[chan][0]; | |
170 | ||
171 | /* Set MPSC Routing */ | |
172 | out_le32(mv64x60_base + mpsc_routing_base + MPSC_MRR, 0x3ffffe38); | |
173 | ||
174 | #ifdef CONFIG_GT64260 | |
175 | out_le32(mv64x60_base + GT64260_MPP_SERIAL_PORTS_MULTIPLEX, 0x00001102); | |
176 | #else /* Must be MV64360 or MV64460 */ | |
177 | { | |
178 | u32 enables, prot_bits, v; | |
179 | ||
180 | /* Set up comm unit to memory mapping windows */ | |
181 | /* Note: Assumes MV64x60_CPU2MEM_WINDOWS == 4 */ | |
182 | ||
183 | enables = in_le32(mv64x60_base + MV64360_CPU_BAR_ENABLE) & 0xf; | |
184 | prot_bits = 0; | |
185 | ||
186 | for (i=0; i<MV64x60_CPU2MEM_WINDOWS; i++) { | |
187 | if (!(enables & (1 << i))) { | |
188 | v = in_le32(mv64x60_base + cpu2mem_tab[i][0]); | |
189 | v = ((v & 0xffff) << 16) | (dram_selects[i] << 8); | |
190 | out_le32(mv64x60_base + com2mem_tab[i][0], v); | |
191 | ||
192 | v = in_le32(mv64x60_base + cpu2mem_tab[i][1]); | |
193 | v = (v & 0xffff) << 16; | |
194 | out_le32(mv64x60_base + com2mem_tab[i][1], v); | |
195 | ||
196 | prot_bits |= (0x3 << (i << 1)); /* r/w access */ | |
197 | } | |
198 | } | |
199 | ||
200 | out_le32(mv64x60_base + MV64360_MPSC_0_REMAP, 0); | |
201 | out_le32(mv64x60_base + MV64360_MPSC_1_REMAP, 0); | |
202 | out_le32(mv64x60_base + MV64360_MPSC2MEM_ACC_PROT_0, prot_bits); | |
203 | out_le32(mv64x60_base + MV64360_MPSC2MEM_ACC_PROT_1, prot_bits); | |
204 | out_le32(mv64x60_base + MV64360_MPSC2MEM_BAR_ENABLE, enables); | |
205 | } | |
206 | #endif | |
207 | ||
208 | /* MPSC 0/1 Rx & Tx get clocks BRG0/1 */ | |
209 | out_le32(mv64x60_base + mpsc_routing_base + MPSC_RCRR, 0x00000100); | |
210 | out_le32(mv64x60_base + mpsc_routing_base + MPSC_TCRR, 0x00000100); | |
211 | ||
212 | /* clear pending interrupts */ | |
213 | out_le32(mv64x60_base + MV64x60_SDMA_INTR_OFFSET + SDMA_INTR_MASK, 0); | |
214 | ||
215 | out_le32(mv64x60_base + SDMA_SCRDP + sdma_base, (int)&rd[chan][0]); | |
216 | out_le32(mv64x60_base + SDMA_SCTDP + sdma_base, | |
217 | (int)&td[chan][TX_NUM_DESC - 1]); | |
218 | out_le32(mv64x60_base + SDMA_SFTDP + sdma_base, | |
219 | (int)&td[chan][TX_NUM_DESC - 1]); | |
220 | ||
221 | out_le32(mv64x60_base + SDMA_SDC + sdma_base, | |
222 | SDMA_SDC_RFT | SDMA_SDC_SFM | SDMA_SDC_BLMR | SDMA_SDC_BLMT | | |
223 | (3 << 12)); | |
224 | ||
225 | cdv = ((mv64x60_mpsc_clk_freq/(32*mv64x60_console_baud))-1); | |
226 | out_le32(mv64x60_base + brg_bcr, | |
227 | ((mv64x60_mpsc_clk_src << 18) | (1 << 16) | cdv)); | |
228 | ||
229 | /* Put MPSC into UART mode, no null modem, 16x clock mode */ | |
230 | out_le32(mv64x60_base + MPSC_MMCRL + mpsc_base[chan], 0x000004c4); | |
231 | out_le32(mv64x60_base + MPSC_MMCRH + mpsc_base[chan], 0x04400400); | |
232 | ||
233 | out_le32(mv64x60_base + MPSC_CHR_1 + mpsc_base[chan], 0); | |
234 | out_le32(mv64x60_base + MPSC_CHR_9 + mpsc_base[chan], 0); | |
235 | out_le32(mv64x60_base + MPSC_CHR_10 + mpsc_base[chan], 0); | |
236 | out_le32(mv64x60_base + MPSC_CHR_3 + mpsc_base[chan], 4); | |
237 | out_le32(mv64x60_base + MPSC_CHR_4 + mpsc_base[chan], 0); | |
238 | out_le32(mv64x60_base + MPSC_CHR_5 + mpsc_base[chan], 0); | |
239 | out_le32(mv64x60_base + MPSC_CHR_6 + mpsc_base[chan], 0); | |
240 | out_le32(mv64x60_base + MPSC_CHR_7 + mpsc_base[chan], 0); | |
241 | out_le32(mv64x60_base + MPSC_CHR_8 + mpsc_base[chan], 0); | |
242 | ||
243 | /* 8 data bits, 1 stop bit */ | |
244 | out_le32(mv64x60_base + MPSC_MPCR + mpsc_base[chan], (3 << 12)); | |
245 | out_le32(mv64x60_base + SDMA_SDCM + sdma_base, SDMA_SDCM_ERD); | |
246 | out_le32(mv64x60_base + MPSC_CHR_2 + mpsc_base[chan], MPSC_CHR_2_EH); | |
247 | ||
248 | udelay(100); | |
249 | ||
250 | return chan; | |
251 | } | |
252 | ||
253 | static void | |
254 | stop_dma(int chan) | |
255 | { | |
256 | int i; | |
257 | ||
258 | /* Abort MPSC Rx (aborting Tx messes things up) */ | |
259 | out_le32(mv64x60_base + MPSC_CHR_2 + mpsc_base[chan], MPSC_CHR_2_RA); | |
260 | ||
261 | /* Abort SDMA Rx, Tx */ | |
262 | out_le32(mv64x60_base + sdma_regs[chan].sdcm, | |
263 | SDMA_SDCM_AR | SDMA_SDCM_STD); | |
264 | ||
265 | for (i=0; i<MAX_RESET_WAIT; i++) { | |
266 | if ((in_le32(mv64x60_base + sdma_regs[chan].sdcm) & | |
267 | (SDMA_SDCM_AR | SDMA_SDCM_AT)) == 0) | |
268 | break; | |
269 | ||
270 | udelay(100); | |
271 | } | |
272 | } | |
273 | ||
274 | static int | |
275 | wait_for_ownership(int chan) | |
276 | { | |
277 | int i; | |
278 | ||
279 | for (i=0; i<MAX_TX_WAIT; i++) { | |
280 | if ((in_le32(mv64x60_base + sdma_regs[chan].sdcm) & | |
281 | SDMA_SDCM_TXD) == 0) | |
282 | break; | |
283 | ||
284 | udelay(1000); | |
285 | } | |
286 | ||
287 | return (i < MAX_TX_WAIT); | |
288 | } | |
289 | ||
290 | void | |
291 | serial_putc(unsigned long com_port, unsigned char c) | |
292 | { | |
293 | struct mv64x60_tx_desc *tdp; | |
294 | ||
295 | if (wait_for_ownership(com_port) == 0) | |
296 | return; | |
297 | ||
298 | tdp = &td[com_port][cur_td[com_port]]; | |
299 | if (++cur_td[com_port] >= TX_NUM_DESC) | |
300 | cur_td[com_port] = 0; | |
301 | ||
302 | *(unchar *)(tdp->buffer ^ 7) = c; | |
303 | tdp->bytecnt = 1; | |
304 | tdp->shadow = 1; | |
305 | tdp->cmd_stat = SDMA_DESC_CMDSTAT_L | SDMA_DESC_CMDSTAT_F | | |
306 | SDMA_DESC_CMDSTAT_O; | |
307 | ||
308 | out_le32(mv64x60_base + sdma_regs[com_port].sctdp, (int)tdp); | |
309 | out_le32(mv64x60_base + sdma_regs[com_port].sftdp, (int)tdp); | |
310 | out_le32(mv64x60_base + sdma_regs[com_port].sdcm, | |
311 | in_le32(mv64x60_base + sdma_regs[com_port].sdcm) | | |
312 | SDMA_SDCM_TXD); | |
313 | } | |
314 | ||
315 | unsigned char | |
316 | serial_getc(unsigned long com_port) | |
317 | { | |
318 | struct mv64x60_rx_desc *rdp; | |
319 | unchar c = '\0'; | |
320 | ||
321 | rdp = &rd[com_port][cur_rd[com_port]]; | |
322 | ||
323 | if ((rdp->cmd_stat & (SDMA_DESC_CMDSTAT_O|SDMA_DESC_CMDSTAT_ES)) == 0) { | |
324 | c = *(unchar *)(rdp->buffer ^ 7); | |
325 | RX_INIT_RDP(rdp); | |
326 | if (++cur_rd[com_port] >= RX_NUM_DESC) | |
327 | cur_rd[com_port] = 0; | |
328 | } | |
329 | ||
330 | return c; | |
331 | } | |
332 | ||
333 | int | |
334 | serial_tstc(unsigned long com_port) | |
335 | { | |
336 | struct mv64x60_rx_desc *rdp; | |
337 | int loop_count = 0; | |
338 | int rc = 0; | |
339 | ||
340 | rdp = &rd[com_port][cur_rd[com_port]]; | |
341 | ||
342 | /* Go thru rcv desc's until empty looking for one with data (no error)*/ | |
343 | while (((rdp->cmd_stat & SDMA_DESC_CMDSTAT_O) == 0) && | |
344 | (loop_count++ < RX_NUM_DESC)) { | |
345 | ||
346 | /* If there was an error, reinit the desc & continue */ | |
347 | if ((rdp->cmd_stat & SDMA_DESC_CMDSTAT_ES) != 0) { | |
348 | RX_INIT_RDP(rdp); | |
349 | if (++cur_rd[com_port] >= RX_NUM_DESC) | |
350 | cur_rd[com_port] = 0; | |
351 | rdp = (struct mv64x60_rx_desc *)rdp->next_desc_ptr; | |
352 | } else { | |
353 | rc = 1; | |
354 | break; | |
355 | } | |
356 | } | |
357 | ||
358 | return rc; | |
359 | } | |
360 | ||
361 | void | |
362 | serial_close(unsigned long com_port) | |
363 | { | |
364 | stop_dma(com_port); | |
365 | } |