1// SPDX-License-Identifier: GPL-2.0-only
2/* 10G controller driver for Samsung SoCs
3 *
4 * Copyright (C) 2013 Samsung Electronics Co., Ltd.
5 * http://www.samsung.com
6 *
7 * Author: Siva Reddy Kallam <siva.kallam@samsung.com>
8 */
9
10#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
11
12#include <linux/export.h>
13#include <linux/io.h>
14#include <linux/netdevice.h>
15#include <linux/phy.h>
16
17#include "sxgbe_common.h"
18#include "sxgbe_reg.h"
19
20/* MAC core initialization */
21static void sxgbe_core_init(void __iomem *ioaddr)
22{
23 u32 regval;
24
25 /* TX configuration */
26 regval = readl(addr: ioaddr + SXGBE_CORE_TX_CONFIG_REG);
27 /* Other configurable parameters IFP, IPG, ISR, ISM
28 * needs to be set if needed
29 */
30 regval |= SXGBE_TX_JABBER_DISABLE;
31 writel(val: regval, addr: ioaddr + SXGBE_CORE_TX_CONFIG_REG);
32
33 /* RX configuration */
34 regval = readl(addr: ioaddr + SXGBE_CORE_RX_CONFIG_REG);
35 /* Other configurable parameters CST, SPEN, USP, GPSLCE
36 * WD, LM, S2KP, HDSMS, GPSL, ELEN, ARPEN needs to be
37 * set if needed
38 */
39 regval |= SXGBE_RX_JUMBPKT_ENABLE | SXGBE_RX_ACS_ENABLE;
40 writel(val: regval, addr: ioaddr + SXGBE_CORE_RX_CONFIG_REG);
41}
42
43/* Dump MAC registers */
44static void sxgbe_core_dump_regs(void __iomem *ioaddr)
45{
46}
47
48static int sxgbe_get_lpi_status(void __iomem *ioaddr, const u32 irq_status)
49{
50 int status = 0;
51 int lpi_status;
52
53 /* Reading this register shall clear all the LPI status bits */
54 lpi_status = readl(addr: ioaddr + SXGBE_CORE_LPI_CTRL_STATUS);
55
56 if (lpi_status & LPI_CTRL_STATUS_TLPIEN)
57 status |= TX_ENTRY_LPI_MODE;
58 if (lpi_status & LPI_CTRL_STATUS_TLPIEX)
59 status |= TX_EXIT_LPI_MODE;
60 if (lpi_status & LPI_CTRL_STATUS_RLPIEN)
61 status |= RX_ENTRY_LPI_MODE;
62 if (lpi_status & LPI_CTRL_STATUS_RLPIEX)
63 status |= RX_EXIT_LPI_MODE;
64
65 return status;
66}
67
68/* Handle extra events on specific interrupts hw dependent */
69static int sxgbe_core_host_irq_status(void __iomem *ioaddr,
70 struct sxgbe_extra_stats *x)
71{
72 int irq_status, status = 0;
73
74 irq_status = readl(addr: ioaddr + SXGBE_CORE_INT_STATUS_REG);
75
76 if (unlikely(irq_status & LPI_INT_STATUS))
77 status |= sxgbe_get_lpi_status(ioaddr, irq_status);
78
79 return status;
80}
81
82/* Set power management mode (e.g. magic frame) */
83static void sxgbe_core_pmt(void __iomem *ioaddr, unsigned long mode)
84{
85}
86
87/* Set/Get Unicast MAC addresses */
88static void sxgbe_core_set_umac_addr(void __iomem *ioaddr,
89 const unsigned char *addr,
90 unsigned int reg_n)
91{
92 u32 high_word, low_word;
93
94 high_word = (addr[5] << 8) | (addr[4]);
95 low_word = (addr[3] << 24) | (addr[2] << 16) |
96 (addr[1] << 8) | (addr[0]);
97 writel(val: high_word, addr: ioaddr + SXGBE_CORE_ADD_HIGHOFFSET(reg_n));
98 writel(val: low_word, addr: ioaddr + SXGBE_CORE_ADD_LOWOFFSET(reg_n));
99}
100
101static void sxgbe_core_get_umac_addr(void __iomem *ioaddr, unsigned char *addr,
102 unsigned int reg_n)
103{
104 u32 high_word, low_word;
105
106 high_word = readl(addr: ioaddr + SXGBE_CORE_ADD_HIGHOFFSET(reg_n));
107 low_word = readl(addr: ioaddr + SXGBE_CORE_ADD_LOWOFFSET(reg_n));
108
109 /* extract and assign address */
110 addr[5] = (high_word & 0x0000FF00) >> 8;
111 addr[4] = (high_word & 0x000000FF);
112 addr[3] = (low_word & 0xFF000000) >> 24;
113 addr[2] = (low_word & 0x00FF0000) >> 16;
114 addr[1] = (low_word & 0x0000FF00) >> 8;
115 addr[0] = (low_word & 0x000000FF);
116}
117
118static void sxgbe_enable_tx(void __iomem *ioaddr, bool enable)
119{
120 u32 tx_config;
121
122 tx_config = readl(addr: ioaddr + SXGBE_CORE_TX_CONFIG_REG);
123 tx_config &= ~SXGBE_TX_ENABLE;
124
125 if (enable)
126 tx_config |= SXGBE_TX_ENABLE;
127 writel(val: tx_config, addr: ioaddr + SXGBE_CORE_TX_CONFIG_REG);
128}
129
130static void sxgbe_enable_rx(void __iomem *ioaddr, bool enable)
131{
132 u32 rx_config;
133
134 rx_config = readl(addr: ioaddr + SXGBE_CORE_RX_CONFIG_REG);
135 rx_config &= ~SXGBE_RX_ENABLE;
136
137 if (enable)
138 rx_config |= SXGBE_RX_ENABLE;
139 writel(val: rx_config, addr: ioaddr + SXGBE_CORE_RX_CONFIG_REG);
140}
141
142static int sxgbe_get_controller_version(void __iomem *ioaddr)
143{
144 return readl(addr: ioaddr + SXGBE_CORE_VERSION_REG);
145}
146
147/* If supported then get the optional core features */
148static unsigned int sxgbe_get_hw_feature(void __iomem *ioaddr,
149 unsigned char feature_index)
150{
151 return readl(addr: ioaddr + (SXGBE_CORE_HW_FEA_REG(feature_index)));
152}
153
154static void sxgbe_core_set_speed(void __iomem *ioaddr, unsigned char speed)
155{
156 u32 tx_cfg = readl(addr: ioaddr + SXGBE_CORE_TX_CONFIG_REG);
157
158 /* clear the speed bits */
159 tx_cfg &= ~0x60000000;
160 tx_cfg |= (speed << SXGBE_SPEED_LSHIFT);
161
162 /* set the speed */
163 writel(val: tx_cfg, addr: ioaddr + SXGBE_CORE_TX_CONFIG_REG);
164}
165
166static void sxgbe_core_enable_rxqueue(void __iomem *ioaddr, int queue_num)
167{
168 u32 reg_val;
169
170 reg_val = readl(addr: ioaddr + SXGBE_CORE_RX_CTL0_REG);
171 reg_val &= ~(SXGBE_CORE_RXQ_ENABLE_MASK << queue_num);
172 reg_val |= SXGBE_CORE_RXQ_ENABLE;
173 writel(val: reg_val, addr: ioaddr + SXGBE_CORE_RX_CTL0_REG);
174}
175
176static void sxgbe_core_disable_rxqueue(void __iomem *ioaddr, int queue_num)
177{
178 u32 reg_val;
179
180 reg_val = readl(addr: ioaddr + SXGBE_CORE_RX_CTL0_REG);
181 reg_val &= ~(SXGBE_CORE_RXQ_ENABLE_MASK << queue_num);
182 reg_val |= SXGBE_CORE_RXQ_DISABLE;
183 writel(val: reg_val, addr: ioaddr + SXGBE_CORE_RX_CTL0_REG);
184}
185
186static void sxgbe_set_eee_mode(void __iomem *ioaddr)
187{
188 u32 ctrl;
189
190 /* Enable the LPI mode for transmit path with Tx automate bit set.
191 * When Tx Automate bit is set, MAC internally handles the entry
192 * to LPI mode after all outstanding and pending packets are
193 * transmitted.
194 */
195 ctrl = readl(addr: ioaddr + SXGBE_CORE_LPI_CTRL_STATUS);
196 ctrl |= LPI_CTRL_STATUS_LPIEN | LPI_CTRL_STATUS_TXA;
197 writel(val: ctrl, addr: ioaddr + SXGBE_CORE_LPI_CTRL_STATUS);
198}
199
200static void sxgbe_reset_eee_mode(void __iomem *ioaddr)
201{
202 u32 ctrl;
203
204 ctrl = readl(addr: ioaddr + SXGBE_CORE_LPI_CTRL_STATUS);
205 ctrl &= ~(LPI_CTRL_STATUS_LPIEN | LPI_CTRL_STATUS_TXA);
206 writel(val: ctrl, addr: ioaddr + SXGBE_CORE_LPI_CTRL_STATUS);
207}
208
209static void sxgbe_set_eee_pls(void __iomem *ioaddr, const int link)
210{
211 u32 ctrl;
212
213 ctrl = readl(addr: ioaddr + SXGBE_CORE_LPI_CTRL_STATUS);
214
215 /* If the PHY link status is UP then set PLS */
216 if (link)
217 ctrl |= LPI_CTRL_STATUS_PLS;
218 else
219 ctrl &= ~LPI_CTRL_STATUS_PLS;
220
221 writel(val: ctrl, addr: ioaddr + SXGBE_CORE_LPI_CTRL_STATUS);
222}
223
224static void sxgbe_set_eee_timer(void __iomem *ioaddr,
225 const int ls, const int tw)
226{
227 int value = ((tw & 0xffff)) | ((ls & 0x7ff) << 16);
228
229 /* Program the timers in the LPI timer control register:
230 * LS: minimum time (ms) for which the link
231 * status from PHY should be ok before transmitting
232 * the LPI pattern.
233 * TW: minimum time (us) for which the core waits
234 * after it has stopped transmitting the LPI pattern.
235 */
236 writel(val: value, addr: ioaddr + SXGBE_CORE_LPI_TIMER_CTRL);
237}
238
239static void sxgbe_enable_rx_csum(void __iomem *ioaddr)
240{
241 u32 ctrl;
242
243 ctrl = readl(addr: ioaddr + SXGBE_CORE_RX_CONFIG_REG);
244 ctrl |= SXGBE_RX_CSUMOFFLOAD_ENABLE;
245 writel(val: ctrl, addr: ioaddr + SXGBE_CORE_RX_CONFIG_REG);
246}
247
248static void sxgbe_disable_rx_csum(void __iomem *ioaddr)
249{
250 u32 ctrl;
251
252 ctrl = readl(addr: ioaddr + SXGBE_CORE_RX_CONFIG_REG);
253 ctrl &= ~SXGBE_RX_CSUMOFFLOAD_ENABLE;
254 writel(val: ctrl, addr: ioaddr + SXGBE_CORE_RX_CONFIG_REG);
255}
256
257static const struct sxgbe_core_ops core_ops = {
258 .core_init = sxgbe_core_init,
259 .dump_regs = sxgbe_core_dump_regs,
260 .host_irq_status = sxgbe_core_host_irq_status,
261 .pmt = sxgbe_core_pmt,
262 .set_umac_addr = sxgbe_core_set_umac_addr,
263 .get_umac_addr = sxgbe_core_get_umac_addr,
264 .enable_rx = sxgbe_enable_rx,
265 .enable_tx = sxgbe_enable_tx,
266 .get_controller_version = sxgbe_get_controller_version,
267 .get_hw_feature = sxgbe_get_hw_feature,
268 .set_speed = sxgbe_core_set_speed,
269 .set_eee_mode = sxgbe_set_eee_mode,
270 .reset_eee_mode = sxgbe_reset_eee_mode,
271 .set_eee_timer = sxgbe_set_eee_timer,
272 .set_eee_pls = sxgbe_set_eee_pls,
273 .enable_rx_csum = sxgbe_enable_rx_csum,
274 .disable_rx_csum = sxgbe_disable_rx_csum,
275 .enable_rxqueue = sxgbe_core_enable_rxqueue,
276 .disable_rxqueue = sxgbe_core_disable_rxqueue,
277};
278
279const struct sxgbe_core_ops *sxgbe_get_core_ops(void)
280{
281 return &core_ops;
282}
283

source code of linux/drivers/net/ethernet/samsung/sxgbe/sxgbe_core.c