1// SPDX-License-Identifier: GPL-2.0
2/*
3 * This file is based on code from OCTEON SDK by Cavium Networks.
4 *
5 * Copyright (c) 2003-2007 Cavium Networks
6 */
7
8#include <linux/kernel.h>
9#include <linux/netdevice.h>
10#include <linux/interrupt.h>
11#include <net/dst.h>
12
13#include "octeon-ethernet.h"
14#include "ethernet-defines.h"
15#include "ethernet-util.h"
16
17static int number_spi_ports;
18static int need_retrain[2] = { 0, 0 };
19
20static void cvm_oct_spxx_int_pr(union cvmx_spxx_int_reg spx_int_reg, int index)
21{
22 if (spx_int_reg.s.spf)
23 pr_err("SPI%d: SRX Spi4 interface down\n", index);
24 if (spx_int_reg.s.calerr)
25 pr_err("SPI%d: SRX Spi4 Calendar table parity error\n", index);
26 if (spx_int_reg.s.syncerr)
27 pr_err("SPI%d: SRX Consecutive Spi4 DIP4 errors have exceeded SPX_ERR_CTL[ERRCNT]\n",
28 index);
29 if (spx_int_reg.s.diperr)
30 pr_err("SPI%d: SRX Spi4 DIP4 error\n", index);
31 if (spx_int_reg.s.tpaovr)
32 pr_err("SPI%d: SRX Selected port has hit TPA overflow\n",
33 index);
34 if (spx_int_reg.s.rsverr)
35 pr_err("SPI%d: SRX Spi4 reserved control word detected\n",
36 index);
37 if (spx_int_reg.s.drwnng)
38 pr_err("SPI%d: SRX Spi4 receive FIFO drowning/overflow\n",
39 index);
40 if (spx_int_reg.s.clserr)
41 pr_err("SPI%d: SRX Spi4 packet closed on non-16B alignment without EOP\n",
42 index);
43 if (spx_int_reg.s.spiovr)
44 pr_err("SPI%d: SRX Spi4 async FIFO overflow\n", index);
45 if (spx_int_reg.s.abnorm)
46 pr_err("SPI%d: SRX Abnormal packet termination (ERR bit)\n",
47 index);
48 if (spx_int_reg.s.prtnxa)
49 pr_err("SPI%d: SRX Port out of range\n", index);
50}
51
52static void cvm_oct_stxx_int_pr(union cvmx_stxx_int_reg stx_int_reg, int index)
53{
54 if (stx_int_reg.s.syncerr)
55 pr_err("SPI%d: STX Interface encountered a fatal error\n",
56 index);
57 if (stx_int_reg.s.frmerr)
58 pr_err("SPI%d: STX FRMCNT has exceeded STX_DIP_CNT[MAXFRM]\n",
59 index);
60 if (stx_int_reg.s.unxfrm)
61 pr_err("SPI%d: STX Unexpected framing sequence\n", index);
62 if (stx_int_reg.s.nosync)
63 pr_err("SPI%d: STX ERRCNT has exceeded STX_DIP_CNT[MAXDIP]\n",
64 index);
65 if (stx_int_reg.s.diperr)
66 pr_err("SPI%d: STX DIP2 error on the Spi4 Status channel\n",
67 index);
68 if (stx_int_reg.s.datovr)
69 pr_err("SPI%d: STX Spi4 FIFO overflow error\n", index);
70 if (stx_int_reg.s.ovrbst)
71 pr_err("SPI%d: STX Transmit packet burst too big\n", index);
72 if (stx_int_reg.s.calpar1)
73 pr_err("SPI%d: STX Calendar Table Parity Error Bank%d\n",
74 index, 1);
75 if (stx_int_reg.s.calpar0)
76 pr_err("SPI%d: STX Calendar Table Parity Error Bank%d\n",
77 index, 0);
78}
79
80static irqreturn_t cvm_oct_spi_spx_int(int index)
81{
82 union cvmx_spxx_int_reg spx_int_reg;
83 union cvmx_stxx_int_reg stx_int_reg;
84
85 spx_int_reg.u64 = cvmx_read_csr(CVMX_SPXX_INT_REG(index));
86 cvmx_write_csr(CVMX_SPXX_INT_REG(index), val: spx_int_reg.u64);
87 if (!need_retrain[index]) {
88 spx_int_reg.u64 &= cvmx_read_csr(CVMX_SPXX_INT_MSK(index));
89 cvm_oct_spxx_int_pr(spx_int_reg, index);
90 }
91
92 stx_int_reg.u64 = cvmx_read_csr(CVMX_STXX_INT_REG(index));
93 cvmx_write_csr(CVMX_STXX_INT_REG(index), val: stx_int_reg.u64);
94 if (!need_retrain[index]) {
95 stx_int_reg.u64 &= cvmx_read_csr(CVMX_STXX_INT_MSK(index));
96 cvm_oct_stxx_int_pr(stx_int_reg, index);
97 }
98
99 cvmx_write_csr(CVMX_SPXX_INT_MSK(index), val: 0);
100 cvmx_write_csr(CVMX_STXX_INT_MSK(index), val: 0);
101 need_retrain[index] = 1;
102
103 return IRQ_HANDLED;
104}
105
106static irqreturn_t cvm_oct_spi_rml_interrupt(int cpl, void *dev_id)
107{
108 irqreturn_t return_status = IRQ_NONE;
109 union cvmx_npi_rsl_int_blocks rsl_int_blocks;
110
111 /* Check and see if this interrupt was caused by the GMX block */
112 rsl_int_blocks.u64 = cvmx_read_csr(CVMX_NPI_RSL_INT_BLOCKS);
113 if (rsl_int_blocks.s.spx1) /* 19 - SPX1_INT_REG & STX1_INT_REG */
114 return_status = cvm_oct_spi_spx_int(index: 1);
115
116 if (rsl_int_blocks.s.spx0) /* 18 - SPX0_INT_REG & STX0_INT_REG */
117 return_status = cvm_oct_spi_spx_int(index: 0);
118
119 return return_status;
120}
121
122static void cvm_oct_spi_enable_error_reporting(int interface)
123{
124 union cvmx_spxx_int_msk spxx_int_msk;
125 union cvmx_stxx_int_msk stxx_int_msk;
126
127 spxx_int_msk.u64 = cvmx_read_csr(CVMX_SPXX_INT_MSK(interface));
128 spxx_int_msk.s.calerr = 1;
129 spxx_int_msk.s.syncerr = 1;
130 spxx_int_msk.s.diperr = 1;
131 spxx_int_msk.s.tpaovr = 1;
132 spxx_int_msk.s.rsverr = 1;
133 spxx_int_msk.s.drwnng = 1;
134 spxx_int_msk.s.clserr = 1;
135 spxx_int_msk.s.spiovr = 1;
136 spxx_int_msk.s.abnorm = 1;
137 spxx_int_msk.s.prtnxa = 1;
138 cvmx_write_csr(CVMX_SPXX_INT_MSK(interface), val: spxx_int_msk.u64);
139
140 stxx_int_msk.u64 = cvmx_read_csr(CVMX_STXX_INT_MSK(interface));
141 stxx_int_msk.s.frmerr = 1;
142 stxx_int_msk.s.unxfrm = 1;
143 stxx_int_msk.s.nosync = 1;
144 stxx_int_msk.s.diperr = 1;
145 stxx_int_msk.s.datovr = 1;
146 stxx_int_msk.s.ovrbst = 1;
147 stxx_int_msk.s.calpar1 = 1;
148 stxx_int_msk.s.calpar0 = 1;
149 cvmx_write_csr(CVMX_STXX_INT_MSK(interface), val: stxx_int_msk.u64);
150}
151
152static void cvm_oct_spi_poll(struct net_device *dev)
153{
154 static int spi4000_port;
155 struct octeon_ethernet *priv = netdev_priv(dev);
156 int interface;
157
158 for (interface = 0; interface < 2; interface++) {
159 if ((priv->port == interface * 16) && need_retrain[interface]) {
160 if (cvmx_spi_restart_interface
161 (interface, mode: CVMX_SPI_MODE_DUPLEX, timeout: 10) == 0) {
162 need_retrain[interface] = 0;
163 cvm_oct_spi_enable_error_reporting(interface);
164 }
165 }
166
167 /*
168 * The SPI4000 TWSI interface is very slow. In order
169 * not to bring the system to a crawl, we only poll a
170 * single port every second. This means negotiation
171 * speed changes take up to 10 seconds, but at least
172 * we don't waste absurd amounts of time waiting for
173 * TWSI.
174 */
175 if (priv->port == spi4000_port) {
176 /*
177 * This function does nothing if it is called on an
178 * interface without a SPI4000.
179 */
180 cvmx_spi4000_check_speed(interface, port: priv->port);
181 /*
182 * Normal ordering increments. By decrementing
183 * we only match once per iteration.
184 */
185 spi4000_port--;
186 if (spi4000_port < 0)
187 spi4000_port = 10;
188 }
189 }
190}
191
192int cvm_oct_spi_init(struct net_device *dev)
193{
194 int r;
195 struct octeon_ethernet *priv = netdev_priv(dev);
196
197 if (number_spi_ports == 0) {
198 r = request_irq(OCTEON_IRQ_RML, handler: cvm_oct_spi_rml_interrupt,
199 IRQF_SHARED, name: "SPI", dev: &number_spi_ports);
200 if (r)
201 return r;
202 }
203 number_spi_ports++;
204
205 if (priv->port == 0 || priv->port == 16) {
206 cvm_oct_spi_enable_error_reporting(interface: INTERFACE(ipd_port: priv->port));
207 priv->poll = cvm_oct_spi_poll;
208 }
209 cvm_oct_common_init(dev);
210 return 0;
211}
212
213void cvm_oct_spi_uninit(struct net_device *dev)
214{
215 int interface;
216
217 cvm_oct_common_uninit(dev);
218 number_spi_ports--;
219 if (number_spi_ports == 0) {
220 for (interface = 0; interface < 2; interface++) {
221 cvmx_write_csr(CVMX_SPXX_INT_MSK(interface), val: 0);
222 cvmx_write_csr(CVMX_STXX_INT_MSK(interface), val: 0);
223 }
224 free_irq(OCTEON_IRQ_RML, &number_spi_ports);
225 }
226}
227

source code of linux/drivers/staging/octeon/ethernet-spi.c