2 * Generic library functions for the microengines found on the Intel
3 * IXP2000 series of network processors.
5 * Copyright (C) 2004, 2005 Lennert Buytenhek <buytenh@wantstofly.org>
6 * Dedicated to Marija Kulikova.
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU Lesser General Public License as
10 * published by the Free Software Foundation; either version 2.1 of the
11 * License, or (at your option) any later version.
14 #include <linux/kernel.h>
15 #include <linux/init.h>
16 #include <linux/slab.h>
17 #include <linux/module.h>
18 #include <linux/string.h>
19 #include <mach/hardware.h>
20 #include <asm/hardware/uengine.h>
23 #if defined(CONFIG_ARCH_IXP2000)
24 #define IXP_UENGINE_CSR_VIRT_BASE IXP2000_UENGINE_CSR_VIRT_BASE
25 #define IXP_PRODUCT_ID IXP2000_PRODUCT_ID
26 #define IXP_MISC_CONTROL IXP2000_MISC_CONTROL
27 #define IXP_RESET1 IXP2000_RESET1
29 #if defined(CONFIG_ARCH_IXP23XX)
30 #define IXP_UENGINE_CSR_VIRT_BASE IXP23XX_UENGINE_CSR_VIRT_BASE
31 #define IXP_PRODUCT_ID IXP23XX_PRODUCT_ID
32 #define IXP_MISC_CONTROL IXP23XX_MISC_CONTROL
33 #define IXP_RESET1 IXP23XX_RESET1
35 #error unknown platform
39 #define USTORE_ADDRESS 0x000
40 #define USTORE_DATA_LOWER 0x004
41 #define USTORE_DATA_UPPER 0x008
42 #define CTX_ENABLES 0x018
43 #define CC_ENABLE 0x01c
44 #define CSR_CTX_POINTER 0x020
45 #define INDIRECT_CTX_STS 0x040
46 #define ACTIVE_CTX_STS 0x044
47 #define INDIRECT_CTX_SIG_EVENTS 0x048
48 #define INDIRECT_CTX_WAKEUP_EVENTS 0x050
51 #define TIMESTAMP_LOW 0x0c0
52 #define TIMESTAMP_HIGH 0x0c4
53 #define T_INDEX_BYTE_INDEX 0x0f4
54 #define LOCAL_CSR_STATUS 0x180
56 u32 ixp2000_uengine_mask;
58 static void *ixp2000_uengine_csr_area(int uengine)
60 return ((void *)IXP_UENGINE_CSR_VIRT_BASE) + (uengine << 10);
64 * LOCAL_CSR_STATUS=1 after a read or write to a microengine's CSR
65 * space means that the microengine we tried to access was also trying
66 * to access its own CSR space on the same clock cycle as we did. When
67 * this happens, we lose the arbitration process by default, and the
68 * read or write we tried to do was not actually performed, so we try
69 * again until it succeeds.
71 u32 ixp2000_uengine_csr_read(int uengine, int offset)
74 u32 *local_csr_status;
78 uebase = ixp2000_uengine_csr_area(uengine);
80 local_csr_status = (u32 *)(uebase + LOCAL_CSR_STATUS);
81 reg = (u32 *)(uebase + offset);
83 value = ixp2000_reg_read(reg);
84 } while (ixp2000_reg_read(local_csr_status) & 1);
88 EXPORT_SYMBOL(ixp2000_uengine_csr_read);
90 void ixp2000_uengine_csr_write(int uengine, int offset, u32 value)
93 u32 *local_csr_status;
96 uebase = ixp2000_uengine_csr_area(uengine);
98 local_csr_status = (u32 *)(uebase + LOCAL_CSR_STATUS);
99 reg = (u32 *)(uebase + offset);
101 ixp2000_reg_write(reg, value);
102 } while (ixp2000_reg_read(local_csr_status) & 1);
104 EXPORT_SYMBOL(ixp2000_uengine_csr_write);
106 void ixp2000_uengine_reset(u32 uengine_mask)
110 value = ixp2000_reg_read(IXP_RESET1) & ~ixp2000_uengine_mask;
112 uengine_mask &= ixp2000_uengine_mask;
113 ixp2000_reg_wrb(IXP_RESET1, value | uengine_mask);
114 ixp2000_reg_wrb(IXP_RESET1, value);
116 EXPORT_SYMBOL(ixp2000_uengine_reset);
118 void ixp2000_uengine_set_mode(int uengine, u32 mode)
121 * CTL_STR_PAR_EN: unconditionally enable parity checking on
125 ixp2000_uengine_csr_write(uengine, CTX_ENABLES, mode);
128 * Enable updating of condition codes.
130 ixp2000_uengine_csr_write(uengine, CC_ENABLE, 0x00002000);
133 * Initialise other per-microengine registers.
135 ixp2000_uengine_csr_write(uengine, NN_PUT, 0x00);
136 ixp2000_uengine_csr_write(uengine, NN_GET, 0x00);
137 ixp2000_uengine_csr_write(uengine, T_INDEX_BYTE_INDEX, 0);
139 EXPORT_SYMBOL(ixp2000_uengine_set_mode);
141 static int make_even_parity(u32 x)
143 return hweight32(x) & 1;
146 static void ustore_write(int uengine, u64 insn)
149 * Generate even parity for top and bottom 20 bits.
151 insn |= (u64)make_even_parity((insn >> 20) & 0x000fffff) << 41;
152 insn |= (u64)make_even_parity(insn & 0x000fffff) << 40;
155 * Write to microstore. The second write auto-increments
156 * the USTORE_ADDRESS index register.
158 ixp2000_uengine_csr_write(uengine, USTORE_DATA_LOWER, (u32)insn);
159 ixp2000_uengine_csr_write(uengine, USTORE_DATA_UPPER, (u32)(insn >> 32));
162 void ixp2000_uengine_load_microcode(int uengine, u8 *ucode, int insns)
167 * Start writing to microstore at address 0.
169 ixp2000_uengine_csr_write(uengine, USTORE_ADDRESS, 0x80000000);
170 for (i = 0; i < insns; i++) {
173 insn = (((u64)ucode[0]) << 32) |
174 (((u64)ucode[1]) << 24) |
175 (((u64)ucode[2]) << 16) |
176 (((u64)ucode[3]) << 8) |
180 ustore_write(uengine, insn);
184 * Pad with a few NOPs at the end (to avoid the microengine
185 * aborting as it prefetches beyond the last instruction), unless
186 * we run off the end of the instruction store first, at which
187 * point the address register will wrap back to zero.
189 for (i = 0; i < 4; i++) {
192 addr = ixp2000_uengine_csr_read(uengine, USTORE_ADDRESS);
193 if (addr == 0x80000000)
195 ustore_write(uengine, 0xf0000c0300ULL);
201 ixp2000_uengine_csr_write(uengine, USTORE_ADDRESS, 0x00000000);
203 EXPORT_SYMBOL(ixp2000_uengine_load_microcode);
205 void ixp2000_uengine_init_context(int uengine, int context, int pc)
208 * Select the right context for indirect access.
210 ixp2000_uengine_csr_write(uengine, CSR_CTX_POINTER, context);
213 * Initialise signal masks to immediately go to Ready state.
215 ixp2000_uengine_csr_write(uengine, INDIRECT_CTX_SIG_EVENTS, 1);
216 ixp2000_uengine_csr_write(uengine, INDIRECT_CTX_WAKEUP_EVENTS, 1);
219 * Set program counter.
221 ixp2000_uengine_csr_write(uengine, INDIRECT_CTX_STS, pc);
223 EXPORT_SYMBOL(ixp2000_uengine_init_context);
225 void ixp2000_uengine_start_contexts(int uengine, u8 ctx_mask)
230 * Enable the specified context to go to Executing state.
232 mask = ixp2000_uengine_csr_read(uengine, CTX_ENABLES);
233 mask |= ctx_mask << 8;
234 ixp2000_uengine_csr_write(uengine, CTX_ENABLES, mask);
236 EXPORT_SYMBOL(ixp2000_uengine_start_contexts);
238 void ixp2000_uengine_stop_contexts(int uengine, u8 ctx_mask)
243 * Disable the Ready->Executing transition. Note that this
244 * does not stop the context until it voluntarily yields.
246 mask = ixp2000_uengine_csr_read(uengine, CTX_ENABLES);
247 mask &= ~(ctx_mask << 8);
248 ixp2000_uengine_csr_write(uengine, CTX_ENABLES, mask);
250 EXPORT_SYMBOL(ixp2000_uengine_stop_contexts);
252 static int check_ixp_type(struct ixp2000_uengine_code *c)
257 product_id = ixp2000_reg_read(IXP_PRODUCT_ID);
258 if (((product_id >> 16) & 0x1f) != 0)
261 switch ((product_id >> 8) & 0xff) {
262 #ifdef CONFIG_ARCH_IXP2000
263 case 0: /* IXP2800 */
264 if (!(c->cpu_model_bitmask & 4))
268 case 1: /* IXP2850 */
269 if (!(c->cpu_model_bitmask & 8))
273 case 2: /* IXP2400 */
274 if (!(c->cpu_model_bitmask & 2))
279 #ifdef CONFIG_ARCH_IXP23XX
280 case 4: /* IXP23xx */
281 if (!(c->cpu_model_bitmask & 0x3f0))
290 rev = product_id & 0xff;
291 if (rev < c->cpu_min_revision || rev > c->cpu_max_revision)
297 static void generate_ucode(u8 *ucode, u32 *gpr_a, u32 *gpr_b)
304 for (i = 0; i < 128; i++) {
310 b3 = (gpr_a[i] >> 24) & 0xff;
311 b2 = (gpr_a[i] >> 16) & 0xff;
312 b1 = (gpr_a[i] >> 8) & 0xff;
313 b0 = gpr_a[i] & 0xff;
315 // immed[@ai, (b1 << 8) | b0]
316 // 11110000 0000VVVV VVVV11VV VVVVVV00 1IIIIIII
317 ucode[offset++] = 0xf0;
318 ucode[offset++] = (b1 >> 4);
319 ucode[offset++] = (b1 << 4) | 0x0c | (b0 >> 6);
320 ucode[offset++] = (b0 << 2);
321 ucode[offset++] = 0x80 | i;
323 // immed_w1[@ai, (b3 << 8) | b2]
324 // 11110100 0100VVVV VVVV11VV VVVVVV00 1IIIIIII
325 ucode[offset++] = 0xf4;
326 ucode[offset++] = 0x40 | (b3 >> 4);
327 ucode[offset++] = (b3 << 4) | 0x0c | (b2 >> 6);
328 ucode[offset++] = (b2 << 2);
329 ucode[offset++] = 0x80 | i;
332 for (i = 0; i < 128; i++) {
338 b3 = (gpr_b[i] >> 24) & 0xff;
339 b2 = (gpr_b[i] >> 16) & 0xff;
340 b1 = (gpr_b[i] >> 8) & 0xff;
341 b0 = gpr_b[i] & 0xff;
343 // immed[@bi, (b1 << 8) | b0]
344 // 11110000 0000VVVV VVVV001I IIIIII11 VVVVVVVV
345 ucode[offset++] = 0xf0;
346 ucode[offset++] = (b1 >> 4);
347 ucode[offset++] = (b1 << 4) | 0x02 | (i >> 6);
348 ucode[offset++] = (i << 2) | 0x03;
349 ucode[offset++] = b0;
351 // immed_w1[@bi, (b3 << 8) | b2]
352 // 11110100 0100VVVV VVVV001I IIIIII11 VVVVVVVV
353 ucode[offset++] = 0xf4;
354 ucode[offset++] = 0x40 | (b3 >> 4);
355 ucode[offset++] = (b3 << 4) | 0x02 | (i >> 6);
356 ucode[offset++] = (i << 2) | 0x03;
357 ucode[offset++] = b2;
361 ucode[offset++] = 0xe0;
362 ucode[offset++] = 0x00;
363 ucode[offset++] = 0x01;
364 ucode[offset++] = 0x00;
365 ucode[offset++] = 0x00;
368 static int set_initial_registers(int uengine, struct ixp2000_uengine_code *c)
376 gpr_a = kzalloc(128 * sizeof(u32), GFP_KERNEL);
377 gpr_b = kzalloc(128 * sizeof(u32), GFP_KERNEL);
378 ucode = kmalloc(513 * 5, GFP_KERNEL);
379 if (gpr_a == NULL || gpr_b == NULL || ucode == NULL) {
387 if (c->uengine_parameters & IXP2000_UENGINE_4_CONTEXTS)
390 for (i = 0; i < 256; i++) {
391 struct ixp2000_reg_value *r = c->initial_reg_values + i;
399 bank = (r->reg & 0x400) ? gpr_b : gpr_a;
400 inc = (r->reg & 0x80) ? 128 : per_ctx_regs;
409 generate_ucode(ucode, gpr_a, gpr_b);
410 ixp2000_uengine_load_microcode(uengine, ucode, 513);
411 ixp2000_uengine_init_context(uengine, 0, 0);
412 ixp2000_uengine_start_contexts(uengine, 0x01);
413 for (i = 0; i < 100; i++) {
416 status = ixp2000_uengine_csr_read(uengine, ACTIVE_CTX_STS);
417 if (!(status & 0x80000000))
420 ixp2000_uengine_stop_contexts(uengine, 0x01);
429 int ixp2000_uengine_load(int uengine, struct ixp2000_uengine_code *c)
433 if (!check_ixp_type(c))
436 if (!(ixp2000_uengine_mask & (1 << uengine)))
439 ixp2000_uengine_reset(1 << uengine);
440 ixp2000_uengine_set_mode(uengine, c->uengine_parameters);
441 if (set_initial_registers(uengine, c))
443 ixp2000_uengine_load_microcode(uengine, c->insns, c->num_insns);
445 for (ctx = 0; ctx < 8; ctx++)
446 ixp2000_uengine_init_context(uengine, ctx, 0);
450 EXPORT_SYMBOL(ixp2000_uengine_load);
453 static int __init ixp2000_uengine_init(void)
459 * Determine number of microengines present.
461 switch ((ixp2000_reg_read(IXP_PRODUCT_ID) >> 8) & 0x1fff) {
462 #ifdef CONFIG_ARCH_IXP2000
463 case 0: /* IXP2800 */
464 case 1: /* IXP2850 */
465 ixp2000_uengine_mask = 0x00ff00ff;
468 case 2: /* IXP2400 */
469 ixp2000_uengine_mask = 0x000f000f;
473 #ifdef CONFIG_ARCH_IXP23XX
474 case 4: /* IXP23xx */
475 ixp2000_uengine_mask = (*IXP23XX_EXP_CFG_FUSE >> 8) & 0xf;
480 printk(KERN_INFO "Detected unknown IXP2000 model (%.8x)\n",
481 (unsigned int)ixp2000_reg_read(IXP_PRODUCT_ID));
482 ixp2000_uengine_mask = 0x00000000;
487 * Reset microengines.
489 ixp2000_uengine_reset(ixp2000_uengine_mask);
492 * Synchronise timestamp counters across all microengines.
494 value = ixp2000_reg_read(IXP_MISC_CONTROL);
495 ixp2000_reg_wrb(IXP_MISC_CONTROL, value & ~0x80);
496 for (uengine = 0; uengine < 32; uengine++) {
497 if (ixp2000_uengine_mask & (1 << uengine)) {
498 ixp2000_uengine_csr_write(uengine, TIMESTAMP_LOW, 0);
499 ixp2000_uengine_csr_write(uengine, TIMESTAMP_HIGH, 0);
502 ixp2000_reg_wrb(IXP_MISC_CONTROL, value | 0x80);
507 subsys_initcall(ixp2000_uengine_init);