1 /*
2 * General Purpose functions for the global management of the
3 * 8260 Communication Processor Module.
4 * Copyright (c) 1999-2001 Dan Malek <dan@embeddedalley.com>
5 * Copyright (c) 2000 MontaVista Software, Inc (source@mvista.com)
6 * 2.3.99 Updates
7 *
8 * 2006 (c) MontaVista Software, Inc.
9 * Vitaly Bordug <vbordug@ru.mvista.com>
10 * Merged to arch/powerpc from arch/ppc/syslib/cpm2_common.c
11 *
12 * This file is licensed under the terms of the GNU General Public License
13 * version 2. This program is licensed "as is" without any warranty of any
14 * kind, whether express or implied.
15 */
16
17 /*
18 *
19 * In addition to the individual control of the communication
20 * channels, there are a few functions that globally affect the
21 * communication processor.
22 *
23 * Buffer descriptors must be allocated from the dual ported memory
24 * space. The allocator for that is here. When the communication
25 * process is reset, we reclaim the memory available. There is
26 * currently no deallocator for this memory.
27 */
28 #include <linux/errno.h>
29 #include <linux/sched.h>
30 #include <linux/kernel.h>
31 #include <linux/param.h>
32 #include <linux/string.h>
33 #include <linux/mm.h>
34 #include <linux/interrupt.h>
35 #include <linux/module.h>
36 #include <linux/of.h>
37
38 #include <asm/io.h>
39 #include <asm/irq.h>
40 #include <asm/mpc8260.h>
41 #include <asm/page.h>
42 #include <asm/pgtable.h>
43 #include <asm/cpm2.h>
44 #include <asm/rheap.h>
45 #include <asm/fs_pd.h>
46
47 #include <sysdev/fsl_soc.h>
48
49 cpm_cpm2_t __iomem *cpmp; /* Pointer to comm processor space */
50
51 /* We allocate this here because it is used almost exclusively for
52 * the communication processor devices.
53 */
54 cpm2_map_t __iomem *cpm2_immr;
55 EXPORT_SYMBOL(cpm2_immr);
56
57 #define CPM_MAP_SIZE (0x40000) /* 256k - the PQ3 reserve this amount
58 of space for CPM as it is larger
59 than on PQ2 */
60
cpm2_reset(void)61 void __init cpm2_reset(void)
62 {
63 #ifdef CONFIG_PPC_85xx
64 cpm2_immr = ioremap(get_immrbase() + 0x80000, CPM_MAP_SIZE);
65 #else
66 cpm2_immr = ioremap(get_immrbase(), CPM_MAP_SIZE);
67 #endif
68
69 /* Reclaim the DP memory for our use.
70 */
71 cpm_muram_init();
72
73 /* Tell everyone where the comm processor resides.
74 */
75 cpmp = &cpm2_immr->im_cpm;
76
77 #ifndef CONFIG_PPC_EARLY_DEBUG_CPM
78 /* Reset the CPM.
79 */
80 cpm_command(CPM_CR_RST, 0);
81 #endif
82 }
83
84 static DEFINE_SPINLOCK(cmd_lock);
85
86 #define MAX_CR_CMD_LOOPS 10000
87
cpm_command(u32 command,u8 opcode)88 int cpm_command(u32 command, u8 opcode)
89 {
90 int i, ret;
91 unsigned long flags;
92
93 spin_lock_irqsave(&cmd_lock, flags);
94
95 ret = 0;
96 out_be32(&cpmp->cp_cpcr, command | opcode | CPM_CR_FLG);
97 for (i = 0; i < MAX_CR_CMD_LOOPS; i++)
98 if ((in_be32(&cpmp->cp_cpcr) & CPM_CR_FLG) == 0)
99 goto out;
100
101 printk(KERN_ERR "%s(): Not able to issue CPM command\n", __func__);
102 ret = -EIO;
103 out:
104 spin_unlock_irqrestore(&cmd_lock, flags);
105 return ret;
106 }
107 EXPORT_SYMBOL(cpm_command);
108
109 /* Set a baud rate generator. This needs lots of work. There are
110 * eight BRGs, which can be connected to the CPM channels or output
111 * as clocks. The BRGs are in two different block of internal
112 * memory mapped space.
113 * The baud rate clock is the system clock divided by something.
114 * It was set up long ago during the initial boot phase and is
115 * is given to us.
116 * Baud rate clocks are zero-based in the driver code (as that maps
117 * to port numbers). Documentation uses 1-based numbering.
118 */
__cpm2_setbrg(uint brg,uint rate,uint clk,int div16,int src)119 void __cpm2_setbrg(uint brg, uint rate, uint clk, int div16, int src)
120 {
121 u32 __iomem *bp;
122 u32 val;
123
124 /* This is good enough to get SMCs running.....
125 */
126 if (brg < 4) {
127 bp = cpm2_map_size(im_brgc1, 16);
128 } else {
129 bp = cpm2_map_size(im_brgc5, 16);
130 brg -= 4;
131 }
132 bp += brg;
133 /* Round the clock divider to the nearest integer. */
134 val = (((clk * 2 / rate) - 1) & ~1) | CPM_BRG_EN | src;
135 if (div16)
136 val |= CPM_BRG_DIV16;
137
138 out_be32(bp, val);
139 cpm2_unmap(bp);
140 }
141 EXPORT_SYMBOL(__cpm2_setbrg);
142
cpm2_clk_setup(enum cpm_clk_target target,int clock,int mode)143 int cpm2_clk_setup(enum cpm_clk_target target, int clock, int mode)
144 {
145 int ret = 0;
146 int shift;
147 int i, bits = 0;
148 cpmux_t __iomem *im_cpmux;
149 u32 __iomem *reg;
150 u32 mask = 7;
151
152 u8 clk_map[][3] = {
153 {CPM_CLK_FCC1, CPM_BRG5, 0},
154 {CPM_CLK_FCC1, CPM_BRG6, 1},
155 {CPM_CLK_FCC1, CPM_BRG7, 2},
156 {CPM_CLK_FCC1, CPM_BRG8, 3},
157 {CPM_CLK_FCC1, CPM_CLK9, 4},
158 {CPM_CLK_FCC1, CPM_CLK10, 5},
159 {CPM_CLK_FCC1, CPM_CLK11, 6},
160 {CPM_CLK_FCC1, CPM_CLK12, 7},
161 {CPM_CLK_FCC2, CPM_BRG5, 0},
162 {CPM_CLK_FCC2, CPM_BRG6, 1},
163 {CPM_CLK_FCC2, CPM_BRG7, 2},
164 {CPM_CLK_FCC2, CPM_BRG8, 3},
165 {CPM_CLK_FCC2, CPM_CLK13, 4},
166 {CPM_CLK_FCC2, CPM_CLK14, 5},
167 {CPM_CLK_FCC2, CPM_CLK15, 6},
168 {CPM_CLK_FCC2, CPM_CLK16, 7},
169 {CPM_CLK_FCC3, CPM_BRG5, 0},
170 {CPM_CLK_FCC3, CPM_BRG6, 1},
171 {CPM_CLK_FCC3, CPM_BRG7, 2},
172 {CPM_CLK_FCC3, CPM_BRG8, 3},
173 {CPM_CLK_FCC3, CPM_CLK13, 4},
174 {CPM_CLK_FCC3, CPM_CLK14, 5},
175 {CPM_CLK_FCC3, CPM_CLK15, 6},
176 {CPM_CLK_FCC3, CPM_CLK16, 7},
177 {CPM_CLK_SCC1, CPM_BRG1, 0},
178 {CPM_CLK_SCC1, CPM_BRG2, 1},
179 {CPM_CLK_SCC1, CPM_BRG3, 2},
180 {CPM_CLK_SCC1, CPM_BRG4, 3},
181 {CPM_CLK_SCC1, CPM_CLK11, 4},
182 {CPM_CLK_SCC1, CPM_CLK12, 5},
183 {CPM_CLK_SCC1, CPM_CLK3, 6},
184 {CPM_CLK_SCC1, CPM_CLK4, 7},
185 {CPM_CLK_SCC2, CPM_BRG1, 0},
186 {CPM_CLK_SCC2, CPM_BRG2, 1},
187 {CPM_CLK_SCC2, CPM_BRG3, 2},
188 {CPM_CLK_SCC2, CPM_BRG4, 3},
189 {CPM_CLK_SCC2, CPM_CLK11, 4},
190 {CPM_CLK_SCC2, CPM_CLK12, 5},
191 {CPM_CLK_SCC2, CPM_CLK3, 6},
192 {CPM_CLK_SCC2, CPM_CLK4, 7},
193 {CPM_CLK_SCC3, CPM_BRG1, 0},
194 {CPM_CLK_SCC3, CPM_BRG2, 1},
195 {CPM_CLK_SCC3, CPM_BRG3, 2},
196 {CPM_CLK_SCC3, CPM_BRG4, 3},
197 {CPM_CLK_SCC3, CPM_CLK5, 4},
198 {CPM_CLK_SCC3, CPM_CLK6, 5},
199 {CPM_CLK_SCC3, CPM_CLK7, 6},
200 {CPM_CLK_SCC3, CPM_CLK8, 7},
201 {CPM_CLK_SCC4, CPM_BRG1, 0},
202 {CPM_CLK_SCC4, CPM_BRG2, 1},
203 {CPM_CLK_SCC4, CPM_BRG3, 2},
204 {CPM_CLK_SCC4, CPM_BRG4, 3},
205 {CPM_CLK_SCC4, CPM_CLK5, 4},
206 {CPM_CLK_SCC4, CPM_CLK6, 5},
207 {CPM_CLK_SCC4, CPM_CLK7, 6},
208 {CPM_CLK_SCC4, CPM_CLK8, 7},
209 };
210
211 im_cpmux = cpm2_map(im_cpmux);
212
213 switch (target) {
214 case CPM_CLK_SCC1:
215 reg = &im_cpmux->cmx_scr;
216 shift = 24;
217 break;
218 case CPM_CLK_SCC2:
219 reg = &im_cpmux->cmx_scr;
220 shift = 16;
221 break;
222 case CPM_CLK_SCC3:
223 reg = &im_cpmux->cmx_scr;
224 shift = 8;
225 break;
226 case CPM_CLK_SCC4:
227 reg = &im_cpmux->cmx_scr;
228 shift = 0;
229 break;
230 case CPM_CLK_FCC1:
231 reg = &im_cpmux->cmx_fcr;
232 shift = 24;
233 break;
234 case CPM_CLK_FCC2:
235 reg = &im_cpmux->cmx_fcr;
236 shift = 16;
237 break;
238 case CPM_CLK_FCC3:
239 reg = &im_cpmux->cmx_fcr;
240 shift = 8;
241 break;
242 default:
243 printk(KERN_ERR "cpm2_clock_setup: invalid clock target\n");
244 return -EINVAL;
245 }
246
247 for (i = 0; i < ARRAY_SIZE(clk_map); i++) {
248 if (clk_map[i][0] == target && clk_map[i][1] == clock) {
249 bits = clk_map[i][2];
250 break;
251 }
252 }
253 if (i == ARRAY_SIZE(clk_map))
254 ret = -EINVAL;
255
256 bits <<= shift;
257 mask <<= shift;
258
259 if (mode == CPM_CLK_RTX) {
260 bits |= bits << 3;
261 mask |= mask << 3;
262 } else if (mode == CPM_CLK_RX) {
263 bits <<= 3;
264 mask <<= 3;
265 }
266
267 out_be32(reg, (in_be32(reg) & ~mask) | bits);
268
269 cpm2_unmap(im_cpmux);
270 return ret;
271 }
272
cpm2_smc_clk_setup(enum cpm_clk_target target,int clock)273 int cpm2_smc_clk_setup(enum cpm_clk_target target, int clock)
274 {
275 int ret = 0;
276 int shift;
277 int i, bits = 0;
278 cpmux_t __iomem *im_cpmux;
279 u8 __iomem *reg;
280 u8 mask = 3;
281
282 u8 clk_map[][3] = {
283 {CPM_CLK_SMC1, CPM_BRG1, 0},
284 {CPM_CLK_SMC1, CPM_BRG7, 1},
285 {CPM_CLK_SMC1, CPM_CLK7, 2},
286 {CPM_CLK_SMC1, CPM_CLK9, 3},
287 {CPM_CLK_SMC2, CPM_BRG2, 0},
288 {CPM_CLK_SMC2, CPM_BRG8, 1},
289 {CPM_CLK_SMC2, CPM_CLK4, 2},
290 {CPM_CLK_SMC2, CPM_CLK15, 3},
291 };
292
293 im_cpmux = cpm2_map(im_cpmux);
294
295 switch (target) {
296 case CPM_CLK_SMC1:
297 reg = &im_cpmux->cmx_smr;
298 mask = 3;
299 shift = 4;
300 break;
301 case CPM_CLK_SMC2:
302 reg = &im_cpmux->cmx_smr;
303 mask = 3;
304 shift = 0;
305 break;
306 default:
307 printk(KERN_ERR "cpm2_smc_clock_setup: invalid clock target\n");
308 return -EINVAL;
309 }
310
311 for (i = 0; i < ARRAY_SIZE(clk_map); i++) {
312 if (clk_map[i][0] == target && clk_map[i][1] == clock) {
313 bits = clk_map[i][2];
314 break;
315 }
316 }
317 if (i == ARRAY_SIZE(clk_map))
318 ret = -EINVAL;
319
320 bits <<= shift;
321 mask <<= shift;
322
323 out_8(reg, (in_8(reg) & ~mask) | bits);
324
325 cpm2_unmap(im_cpmux);
326 return ret;
327 }
328
329 struct cpm2_ioports {
330 u32 dir, par, sor, odr, dat;
331 u32 res[3];
332 };
333
cpm2_set_pin(int port,int pin,int flags)334 void cpm2_set_pin(int port, int pin, int flags)
335 {
336 struct cpm2_ioports __iomem *iop =
337 (struct cpm2_ioports __iomem *)&cpm2_immr->im_ioport;
338
339 pin = 1 << (31 - pin);
340
341 if (flags & CPM_PIN_OUTPUT)
342 setbits32(&iop[port].dir, pin);
343 else
344 clrbits32(&iop[port].dir, pin);
345
346 if (!(flags & CPM_PIN_GPIO))
347 setbits32(&iop[port].par, pin);
348 else
349 clrbits32(&iop[port].par, pin);
350
351 if (flags & CPM_PIN_SECONDARY)
352 setbits32(&iop[port].sor, pin);
353 else
354 clrbits32(&iop[port].sor, pin);
355
356 if (flags & CPM_PIN_OPENDRAIN)
357 setbits32(&iop[port].odr, pin);
358 else
359 clrbits32(&iop[port].odr, pin);
360 }
361
cpm_init_par_io(void)362 static int cpm_init_par_io(void)
363 {
364 struct device_node *np;
365
366 for_each_compatible_node(np, NULL, "fsl,cpm2-pario-bank")
367 cpm2_gpiochip_add32(np);
368 return 0;
369 }
370 arch_initcall(cpm_init_par_io);
371
372