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1 From: Lorenzo Bianconi <lorenzo@kernel.org>
2 Date: Sat, 14 Jan 2023 18:01:30 +0100
3 Subject: [PATCH] net: ethernet: mtk_eth_soc: align reset procedure to vendor
4 sdk
5
6 Avoid to power-down the ethernet chip during hw reset and align reset
7 procedure to vendor sdk.
8
9 Reviewed-by: Leon Romanovsky <leonro@nvidia.com>
10 Tested-by: Daniel Golle <daniel@makrotopia.org>
11 Co-developed-by: Sujuan Chen <sujuan.chen@mediatek.com>
12 Signed-off-by: Sujuan Chen <sujuan.chen@mediatek.com>
13 Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org>
14 Signed-off-by: Paolo Abeni <pabeni@redhat.com>
15 ---
16
17 --- a/drivers/net/ethernet/mediatek/mtk_eth_soc.c
18 +++ b/drivers/net/ethernet/mediatek/mtk_eth_soc.c
19 @@ -2842,14 +2842,29 @@ static void mtk_dma_free(struct mtk_eth
20 kfree(eth->scratch_head);
21 }
22
23 +static bool mtk_hw_reset_check(struct mtk_eth *eth)
24 +{
25 + u32 val = mtk_r32(eth, MTK_INT_STATUS2);
26 +
27 + return (val & MTK_FE_INT_FQ_EMPTY) || (val & MTK_FE_INT_RFIFO_UF) ||
28 + (val & MTK_FE_INT_RFIFO_OV) || (val & MTK_FE_INT_TSO_FAIL) ||
29 + (val & MTK_FE_INT_TSO_ALIGN) || (val & MTK_FE_INT_TSO_ILLEGAL);
30 +}
31 +
32 static void mtk_tx_timeout(struct net_device *dev, unsigned int txqueue)
33 {
34 struct mtk_mac *mac = netdev_priv(dev);
35 struct mtk_eth *eth = mac->hw;
36
37 + if (test_bit(MTK_RESETTING, &eth->state))
38 + return;
39 +
40 + if (!mtk_hw_reset_check(eth))
41 + return;
42 +
43 eth->netdev[mac->id]->stats.tx_errors++;
44 - netif_err(eth, tx_err, dev,
45 - "transmit timed out\n");
46 + netif_err(eth, tx_err, dev, "transmit timed out\n");
47 +
48 schedule_work(&eth->pending_work);
49 }
50
51 @@ -3329,15 +3344,17 @@ static int mtk_hw_init(struct mtk_eth *e
52 const struct mtk_reg_map *reg_map = eth->soc->reg_map;
53 int i, val, ret;
54
55 - if (test_and_set_bit(MTK_HW_INIT, &eth->state))
56 + if (!reset && test_and_set_bit(MTK_HW_INIT, &eth->state))
57 return 0;
58
59 - pm_runtime_enable(eth->dev);
60 - pm_runtime_get_sync(eth->dev);
61 + if (!reset) {
62 + pm_runtime_enable(eth->dev);
63 + pm_runtime_get_sync(eth->dev);
64
65 - ret = mtk_clk_enable(eth);
66 - if (ret)
67 - goto err_disable_pm;
68 + ret = mtk_clk_enable(eth);
69 + if (ret)
70 + goto err_disable_pm;
71 + }
72
73 if (eth->ethsys)
74 regmap_update_bits(eth->ethsys, ETHSYS_DMA_AG_MAP, dma_mask,
75 @@ -3466,8 +3483,10 @@ static int mtk_hw_init(struct mtk_eth *e
76 return 0;
77
78 err_disable_pm:
79 - pm_runtime_put_sync(eth->dev);
80 - pm_runtime_disable(eth->dev);
81 + if (!reset) {
82 + pm_runtime_put_sync(eth->dev);
83 + pm_runtime_disable(eth->dev);
84 + }
85
86 return ret;
87 }
88 @@ -3529,30 +3548,53 @@ static int mtk_do_ioctl(struct net_devic
89 return -EOPNOTSUPP;
90 }
91
92 +static void mtk_prepare_for_reset(struct mtk_eth *eth)
93 +{
94 + u32 val;
95 + int i;
96 +
97 + /* disabe FE P3 and P4 */
98 + val = mtk_r32(eth, MTK_FE_GLO_CFG) | MTK_FE_LINK_DOWN_P3;
99 + if (MTK_HAS_CAPS(eth->soc->caps, MTK_RSTCTRL_PPE1))
100 + val |= MTK_FE_LINK_DOWN_P4;
101 + mtk_w32(eth, val, MTK_FE_GLO_CFG);
102 +
103 + /* adjust PPE configurations to prepare for reset */
104 + for (i = 0; i < ARRAY_SIZE(eth->ppe); i++)
105 + mtk_ppe_prepare_reset(eth->ppe[i]);
106 +
107 + /* disable NETSYS interrupts */
108 + mtk_w32(eth, 0, MTK_FE_INT_ENABLE);
109 +
110 + /* force link down GMAC */
111 + for (i = 0; i < 2; i++) {
112 + val = mtk_r32(eth, MTK_MAC_MCR(i)) & ~MAC_MCR_FORCE_LINK;
113 + mtk_w32(eth, val, MTK_MAC_MCR(i));
114 + }
115 +}
116 +
117 static void mtk_pending_work(struct work_struct *work)
118 {
119 struct mtk_eth *eth = container_of(work, struct mtk_eth, pending_work);
120 - int err, i;
121 unsigned long restart = 0;
122 + u32 val;
123 + int i;
124
125 rtnl_lock();
126 -
127 - dev_dbg(eth->dev, "[%s][%d] reset\n", __func__, __LINE__);
128 set_bit(MTK_RESETTING, &eth->state);
129
130 + mtk_prepare_for_reset(eth);
131 +
132 /* stop all devices to make sure that dma is properly shut down */
133 for (i = 0; i < MTK_MAC_COUNT; i++) {
134 - if (!eth->netdev[i])
135 + if (!eth->netdev[i] || !netif_running(eth->netdev[i]))
136 continue;
137 +
138 mtk_stop(eth->netdev[i]);
139 __set_bit(i, &restart);
140 }
141 - dev_dbg(eth->dev, "[%s][%d] mtk_stop ends\n", __func__, __LINE__);
142
143 - /* restart underlying hardware such as power, clock, pin mux
144 - * and the connected phy
145 - */
146 - mtk_hw_deinit(eth);
147 + usleep_range(15000, 16000);
148
149 if (eth->dev->pins)
150 pinctrl_select_state(eth->dev->pins->p,
151 @@ -3563,15 +3605,19 @@ static void mtk_pending_work(struct work
152 for (i = 0; i < MTK_MAC_COUNT; i++) {
153 if (!test_bit(i, &restart))
154 continue;
155 - err = mtk_open(eth->netdev[i]);
156 - if (err) {
157 +
158 + if (mtk_open(eth->netdev[i])) {
159 netif_alert(eth, ifup, eth->netdev[i],
160 - "Driver up/down cycle failed, closing device.\n");
161 + "Driver up/down cycle failed\n");
162 dev_close(eth->netdev[i]);
163 }
164 }
165
166 - dev_dbg(eth->dev, "[%s][%d] reset done\n", __func__, __LINE__);
167 + /* enabe FE P3 and P4 */
168 + val = mtk_r32(eth, MTK_FE_GLO_CFG) & ~MTK_FE_LINK_DOWN_P3;
169 + if (MTK_HAS_CAPS(eth->soc->caps, MTK_RSTCTRL_PPE1))
170 + val &= ~MTK_FE_LINK_DOWN_P4;
171 + mtk_w32(eth, val, MTK_FE_GLO_CFG);
172
173 clear_bit(MTK_RESETTING, &eth->state);
174
175 --- a/drivers/net/ethernet/mediatek/mtk_eth_soc.h
176 +++ b/drivers/net/ethernet/mediatek/mtk_eth_soc.h
177 @@ -72,12 +72,24 @@
178 #define MTK_HW_LRO_REPLACE_DELTA 1000
179 #define MTK_HW_LRO_SDL_REMAIN_ROOM 1522
180
181 +/* Frame Engine Global Configuration */
182 +#define MTK_FE_GLO_CFG 0x00
183 +#define MTK_FE_LINK_DOWN_P3 BIT(11)
184 +#define MTK_FE_LINK_DOWN_P4 BIT(12)
185 +
186 /* Frame Engine Global Reset Register */
187 #define MTK_RST_GL 0x04
188 #define RST_GL_PSE BIT(0)
189
190 /* Frame Engine Interrupt Status Register */
191 #define MTK_INT_STATUS2 0x08
192 +#define MTK_FE_INT_ENABLE 0x0c
193 +#define MTK_FE_INT_FQ_EMPTY BIT(8)
194 +#define MTK_FE_INT_TSO_FAIL BIT(12)
195 +#define MTK_FE_INT_TSO_ILLEGAL BIT(13)
196 +#define MTK_FE_INT_TSO_ALIGN BIT(14)
197 +#define MTK_FE_INT_RFIFO_OV BIT(18)
198 +#define MTK_FE_INT_RFIFO_UF BIT(19)
199 #define MTK_GDM1_AF BIT(28)
200 #define MTK_GDM2_AF BIT(29)
201
202 --- a/drivers/net/ethernet/mediatek/mtk_ppe.c
203 +++ b/drivers/net/ethernet/mediatek/mtk_ppe.c
204 @@ -710,6 +710,33 @@ int mtk_foe_entry_idle_time(struct mtk_p
205 return __mtk_foe_entry_idle_time(ppe, entry->data.ib1);
206 }
207
208 +int mtk_ppe_prepare_reset(struct mtk_ppe *ppe)
209 +{
210 + if (!ppe)
211 + return -EINVAL;
212 +
213 + /* disable KA */
214 + ppe_clear(ppe, MTK_PPE_TB_CFG, MTK_PPE_TB_CFG_KEEPALIVE);
215 + ppe_clear(ppe, MTK_PPE_BIND_LMT1, MTK_PPE_NTU_KEEPALIVE);
216 + ppe_w32(ppe, MTK_PPE_KEEPALIVE, 0);
217 + usleep_range(10000, 11000);
218 +
219 + /* set KA timer to maximum */
220 + ppe_set(ppe, MTK_PPE_BIND_LMT1, MTK_PPE_NTU_KEEPALIVE);
221 + ppe_w32(ppe, MTK_PPE_KEEPALIVE, 0xffffffff);
222 +
223 + /* set KA tick select */
224 + ppe_set(ppe, MTK_PPE_TB_CFG, MTK_PPE_TB_TICK_SEL);
225 + ppe_set(ppe, MTK_PPE_TB_CFG, MTK_PPE_TB_CFG_KEEPALIVE);
226 + usleep_range(10000, 11000);
227 +
228 + /* disable scan mode */
229 + ppe_clear(ppe, MTK_PPE_TB_CFG, MTK_PPE_TB_CFG_SCAN_MODE);
230 + usleep_range(10000, 11000);
231 +
232 + return mtk_ppe_wait_busy(ppe);
233 +}
234 +
235 struct mtk_ppe *mtk_ppe_init(struct mtk_eth *eth, void __iomem *base,
236 int version, int index)
237 {
238 --- a/drivers/net/ethernet/mediatek/mtk_ppe.h
239 +++ b/drivers/net/ethernet/mediatek/mtk_ppe.h
240 @@ -306,6 +306,7 @@ struct mtk_ppe *mtk_ppe_init(struct mtk_
241 void mtk_ppe_deinit(struct mtk_eth *eth);
242 void mtk_ppe_start(struct mtk_ppe *ppe);
243 int mtk_ppe_stop(struct mtk_ppe *ppe);
244 +int mtk_ppe_prepare_reset(struct mtk_ppe *ppe);
245
246 void __mtk_ppe_check_skb(struct mtk_ppe *ppe, struct sk_buff *skb, u16 hash);
247
248 --- a/drivers/net/ethernet/mediatek/mtk_ppe_regs.h
249 +++ b/drivers/net/ethernet/mediatek/mtk_ppe_regs.h
250 @@ -58,6 +58,12 @@
251 #define MTK_PPE_TB_CFG_SCAN_MODE GENMASK(17, 16)
252 #define MTK_PPE_TB_CFG_HASH_DEBUG GENMASK(19, 18)
253 #define MTK_PPE_TB_CFG_INFO_SEL BIT(20)
254 +#define MTK_PPE_TB_TICK_SEL BIT(24)
255 +
256 +#define MTK_PPE_BIND_LMT1 0x230
257 +#define MTK_PPE_NTU_KEEPALIVE GENMASK(23, 16)
258 +
259 +#define MTK_PPE_KEEPALIVE 0x234
260
261 enum {
262 MTK_PPE_SCAN_MODE_DISABLED,
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