tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1/*****************************************************************************
2 * *
3 * File: espi.c *
4 * $Revision: 1.14 $ *
5 * $Date: 2005/05/14 00:59:32 $ *
6 * Description: *
7 * Ethernet SPI functionality. *
8 * part of the Chelsio 10Gb Ethernet Driver. *
9 * *
10 * This program is free software; you can redistribute it and/or modify *
11 * it under the terms of the GNU General Public License, version 2, as *
12 * published by the Free Software Foundation. *
13 * *
14 * You should have received a copy of the GNU General Public License along *
15 * with this program; if not, write to the Free Software Foundation, Inc., *
16 * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. *
17 * *
18 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED *
19 * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF *
20 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. *
21 * *
22 * http://www.chelsio.com *
23 * *
24 * Copyright (c) 2003 - 2005 Chelsio Communications, Inc. *
25 * All rights reserved. *
26 * *
27 * Maintainers: maintainers@chelsio.com *
28 * *
29 * Authors: Dimitrios Michailidis <dm@chelsio.com> *
30 * Tina Yang <tainay@chelsio.com> *
31 * Felix Marti <felix@chelsio.com> *
32 * Scott Bardone <sbardone@chelsio.com> *
33 * Kurt Ottaway <kottaway@chelsio.com> *
34 * Frank DiMambro <frank@chelsio.com> *
35 * *
36 * History: *
37 * *
38 ****************************************************************************/
39
40#include "common.h"
41#include "regs.h"
42#include "espi.h"
43
44struct peespi {
45 adapter_t *adapter;
46 struct espi_intr_counts intr_cnt;
47 u32 misc_ctrl;
48 spinlock_t lock;
49};
50
51#define ESPI_INTR_MASK (F_DIP4ERR | F_RXDROP | F_TXDROP | F_RXOVERFLOW | \
52 F_RAMPARITYERR | F_DIP2PARITYERR)
53#define MON_MASK (V_MONITORED_PORT_NUM(3) | F_MONITORED_DIRECTION \
54 | F_MONITORED_INTERFACE)
55
56#define TRICN_CNFG 14
57#define TRICN_CMD_READ 0x11
58#define TRICN_CMD_WRITE 0x21
59#define TRICN_CMD_ATTEMPTS 10
60
61static int tricn_write(adapter_t *adapter, int bundle_addr, int module_addr,
62 int ch_addr, int reg_offset, u32 wr_data)
63{
64 int busy, attempts = TRICN_CMD_ATTEMPTS;
65
66 writel(V_WRITE_DATA(wr_data) |
67 V_REGISTER_OFFSET(reg_offset) |
68 V_CHANNEL_ADDR(ch_addr) | V_MODULE_ADDR(module_addr) |
69 V_BUNDLE_ADDR(bundle_addr) |
70 V_SPI4_COMMAND(TRICN_CMD_WRITE),
71 adapter->regs + A_ESPI_CMD_ADDR);
72 writel(0, adapter->regs + A_ESPI_GOSTAT);
73
74 do {
75 busy = readl(adapter->regs + A_ESPI_GOSTAT) & F_ESPI_CMD_BUSY;
76 } while (busy && --attempts);
77
78 if (busy)
79 CH_ERR("%s: TRICN write timed out\n", adapter->name);
80
81 return busy;
82}
83
84/* 1. Deassert rx_reset_core. */
85/* 2. Program TRICN_CNFG registers. */
86/* 3. Deassert rx_reset_link */
87static int tricn_init(adapter_t *adapter)
88{
89 int i = 0;
90 int sme = 1;
91 int stat = 0;
92 int timeout = 0;
93 int is_ready = 0;
94 int dynamic_deskew = 0;
95
96 if (dynamic_deskew)
97 sme = 0;
98
99
100 /* 1 */
101 timeout=1000;
102 do {
103 stat = readl(adapter->regs + A_ESPI_RX_RESET);
104 is_ready = (stat & 0x4);
105 timeout--;
106 udelay(5);
107 } while (!is_ready || (timeout==0));
108 writel(0x2, adapter->regs + A_ESPI_RX_RESET);
109 if (timeout==0)
110 {
111 CH_ERR("ESPI : ERROR : Timeout tricn_init() \n");
112 t1_fatal_err(adapter);
113 }
114
115 /* 2 */
116 if (sme) {
117 tricn_write(adapter, 0, 0, 0, TRICN_CNFG, 0x81);
118 tricn_write(adapter, 0, 1, 0, TRICN_CNFG, 0x81);
119 tricn_write(adapter, 0, 2, 0, TRICN_CNFG, 0x81);
120 }
121 for (i=1; i<= 8; i++) tricn_write(adapter, 0, 0, i, TRICN_CNFG, 0xf1);
122 for (i=1; i<= 2; i++) tricn_write(adapter, 0, 1, i, TRICN_CNFG, 0xf1);
123 for (i=1; i<= 3; i++) tricn_write(adapter, 0, 2, i, TRICN_CNFG, 0xe1);
124 for (i=4; i<= 4; i++) tricn_write(adapter, 0, 2, i, TRICN_CNFG, 0xf1);
125 for (i=5; i<= 5; i++) tricn_write(adapter, 0, 2, i, TRICN_CNFG, 0xe1);
126 for (i=6; i<= 6; i++) tricn_write(adapter, 0, 2, i, TRICN_CNFG, 0xf1);
127 for (i=7; i<= 7; i++) tricn_write(adapter, 0, 2, i, TRICN_CNFG, 0x80);
128 for (i=8; i<= 8; i++) tricn_write(adapter, 0, 2, i, TRICN_CNFG, 0xf1);
129
130 /* 3 */
131 writel(0x3, adapter->regs + A_ESPI_RX_RESET);
132
133 return 0;
134}
135
136void t1_espi_intr_enable(struct peespi *espi)
137{
138 u32 enable, pl_intr = readl(espi->adapter->regs + A_PL_ENABLE);
139
140 /*
141 * Cannot enable ESPI interrupts on T1B because HW asserts the
142 * interrupt incorrectly, namely the driver gets ESPI interrupts
143 * but no data is actually dropped (can verify this reading the ESPI
144 * drop registers). Also, once the ESPI interrupt is asserted it
145 * cannot be cleared (HW bug).
146 */
147 enable = t1_is_T1B(espi->adapter) ? 0 : ESPI_INTR_MASK;
148 writel(enable, espi->adapter->regs + A_ESPI_INTR_ENABLE);
149 writel(pl_intr | F_PL_INTR_ESPI, espi->adapter->regs + A_PL_ENABLE);
150}
151
152void t1_espi_intr_clear(struct peespi *espi)
153{
154 writel(0xffffffff, espi->adapter->regs + A_ESPI_INTR_STATUS);
155 writel(F_PL_INTR_ESPI, espi->adapter->regs + A_PL_CAUSE);
156}
157
158void t1_espi_intr_disable(struct peespi *espi)
159{
160 u32 pl_intr = readl(espi->adapter->regs + A_PL_ENABLE);
161
162 writel(0, espi->adapter->regs + A_ESPI_INTR_ENABLE);
163 writel(pl_intr & ~F_PL_INTR_ESPI, espi->adapter->regs + A_PL_ENABLE);
164}
165
166int t1_espi_intr_handler(struct peespi *espi)
167{
168 u32 cnt;
169 u32 status = readl(espi->adapter->regs + A_ESPI_INTR_STATUS);
170
171 if (status & F_DIP4ERR)
172 espi->intr_cnt.DIP4_err++;
173 if (status & F_RXDROP)
174 espi->intr_cnt.rx_drops++;
175 if (status & F_TXDROP)
176 espi->intr_cnt.tx_drops++;
177 if (status & F_RXOVERFLOW)
178 espi->intr_cnt.rx_ovflw++;
179 if (status & F_RAMPARITYERR)
180 espi->intr_cnt.parity_err++;
181 if (status & F_DIP2PARITYERR) {
182 espi->intr_cnt.DIP2_parity_err++;
183
184 /*
185 * Must read the error count to clear the interrupt
186 * that it causes.
187 */
188 cnt = readl(espi->adapter->regs + A_ESPI_DIP2_ERR_COUNT);
189 }
190
191 /*
192 * For T1B we need to write 1 to clear ESPI interrupts. For T2+ we
193 * write the status as is.
194 */
195 if (status && t1_is_T1B(espi->adapter))
196 status = 1;
197 writel(status, espi->adapter->regs + A_ESPI_INTR_STATUS);
198 return 0;
199}
200
201const struct espi_intr_counts *t1_espi_get_intr_counts(struct peespi *espi)
202{
203 return &espi->intr_cnt;
204}
205
206static void espi_setup_for_pm3393(adapter_t *adapter)
207{
208 u32 wmark = t1_is_T1B(adapter) ? 0x4000 : 0x3200;
209
210 writel(0x1f4, adapter->regs + A_ESPI_SCH_TOKEN0);
211 writel(0x1f4, adapter->regs + A_ESPI_SCH_TOKEN1);
212 writel(0x1f4, adapter->regs + A_ESPI_SCH_TOKEN2);
213 writel(0x1f4, adapter->regs + A_ESPI_SCH_TOKEN3);
214 writel(0x100, adapter->regs + A_ESPI_RX_FIFO_ALMOST_EMPTY_WATERMARK);
215 writel(wmark, adapter->regs + A_ESPI_RX_FIFO_ALMOST_FULL_WATERMARK);
216 writel(3, adapter->regs + A_ESPI_CALENDAR_LENGTH);
217 writel(0x08000008, adapter->regs + A_ESPI_TRAIN);
218 writel(V_RX_NPORTS(1) | V_TX_NPORTS(1), adapter->regs + A_PORT_CONFIG);
219}
220
221/* T2 Init part -- */
222/* 1. Set T_ESPI_MISCCTRL_ADDR */
223/* 2. Init ESPI registers. */
224/* 3. Init TriCN Hard Macro */
225int t1_espi_init(struct peespi *espi, int mac_type, int nports)
226{
227 u32 cnt;
228
229 u32 status_enable_extra = 0;
230 adapter_t *adapter = espi->adapter;
231 u32 status, burstval = 0x800100;
232
233 /* Disable ESPI training. MACs that can handle it enable it below. */
234 writel(0, adapter->regs + A_ESPI_TRAIN);
235
236 if (is_T2(adapter)) {
237 writel(V_OUT_OF_SYNC_COUNT(4) |
238 V_DIP2_PARITY_ERR_THRES(3) |
239 V_DIP4_THRES(1), adapter->regs + A_ESPI_MISC_CONTROL);
240 if (nports == 4) {
241 /* T204: maxburst1 = 0x40, maxburst2 = 0x20 */
242 burstval = 0x200040;
243 }
244 }
245 writel(burstval, adapter->regs + A_ESPI_MAXBURST1_MAXBURST2);
246
247 switch (mac_type) {
248 case CHBT_MAC_PM3393:
249 espi_setup_for_pm3393(adapter);
250 break;
251 default:
252 return -1;
253 }
254
255 /*
256 * Make sure any pending interrupts from the SPI are
257 * Cleared before enabling the interrupt.
258 */
259 writel(ESPI_INTR_MASK, espi->adapter->regs + A_ESPI_INTR_ENABLE);
260 status = readl(espi->adapter->regs + A_ESPI_INTR_STATUS);
261 if (status & F_DIP2PARITYERR) {
262 cnt = readl(espi->adapter->regs + A_ESPI_DIP2_ERR_COUNT);
263 }
264
265 /*
266 * For T1B we need to write 1 to clear ESPI interrupts. For T2+ we
267 * write the status as is.
268 */
269 if (status && t1_is_T1B(espi->adapter))
270 status = 1;
271 writel(status, espi->adapter->regs + A_ESPI_INTR_STATUS);
272
273 writel(status_enable_extra | F_RXSTATUSENABLE,
274 adapter->regs + A_ESPI_FIFO_STATUS_ENABLE);
275
276 if (is_T2(adapter)) {
277 tricn_init(adapter);
278 /*
279 * Always position the control at the 1st port egress IN
280 * (sop,eop) counter to reduce PIOs for T/N210 workaround.
281 */
282 espi->misc_ctrl = (readl(adapter->regs + A_ESPI_MISC_CONTROL)
283 & ~MON_MASK) | (F_MONITORED_DIRECTION
284 | F_MONITORED_INTERFACE);
285 writel(espi->misc_ctrl, adapter->regs + A_ESPI_MISC_CONTROL);
286 spin_lock_init(&espi->lock);
287 }
288
289 return 0;
290}
291
292void t1_espi_destroy(struct peespi *espi)
293{
294 kfree(espi);
295}
296
297struct peespi *t1_espi_create(adapter_t *adapter)
298{
299 struct peespi *espi = kmalloc(sizeof(*espi), GFP_KERNEL);
300
301 memset(espi, 0, sizeof(*espi));
302
303 if (espi)
304 espi->adapter = adapter;
305 return espi;
306}
307
308void t1_espi_set_misc_ctrl(adapter_t *adapter, u32 val)
309{
310 struct peespi *espi = adapter->espi;
311
312 if (!is_T2(adapter))
313 return;
314 spin_lock(&espi->lock);
315 espi->misc_ctrl = (val & ~MON_MASK) |
316 (espi->misc_ctrl & MON_MASK);
317 writel(espi->misc_ctrl, adapter->regs + A_ESPI_MISC_CONTROL);
318 spin_unlock(&espi->lock);
319}
320
321u32 t1_espi_get_mon(adapter_t *adapter, u32 addr, u8 wait)
322{
323 u32 sel;
324
325 struct peespi *espi = adapter->espi;
326
327 if (!is_T2(adapter))
328 return 0;
329 sel = V_MONITORED_PORT_NUM((addr & 0x3c) >> 2);
330 if (!wait) {
331 if (!spin_trylock(&espi->lock))
332 return 0;
333 }
334 else
335 spin_lock(&espi->lock);
336 if ((sel != (espi->misc_ctrl & MON_MASK))) {
337 writel(((espi->misc_ctrl & ~MON_MASK) | sel),
338 adapter->regs + A_ESPI_MISC_CONTROL);
339 sel = readl(adapter->regs + A_ESPI_SCH_TOKEN3);
340 writel(espi->misc_ctrl, adapter->regs + A_ESPI_MISC_CONTROL);
341 }
342 else
343 sel = readl(adapter->regs + A_ESPI_SCH_TOKEN3);
344 spin_unlock(&espi->lock);
345 return sel;
346}