1 // SPDX-License-Identifier: GPL-2.0
3 * Copyright (c) 2018 MediaTek Inc.
5 #include <linux/bitfield.h>
7 #include <linux/mfd/syscon.h>
8 #include <linux/module.h>
10 #include <linux/of_device.h>
11 #include <linux/of_net.h>
12 #include <linux/pm_runtime.h>
13 #include <linux/regmap.h>
14 #include <linux/stmmac.h>
17 #include "stmmac_platform.h"
19 /* Peri Configuration register for mt2712 */
20 #define PERI_ETH_PHY_INTF_SEL 0x418
21 #define PHY_INTF_MII 0
22 #define PHY_INTF_RGMII 1
23 #define PHY_INTF_RMII 4
24 #define RMII_CLK_SRC_RXC BIT(4)
25 #define RMII_CLK_SRC_INTERNAL BIT(5)
27 #define PERI_ETH_DLY 0x428
28 #define ETH_DLY_GTXC_INV BIT(6)
29 #define ETH_DLY_GTXC_ENABLE BIT(5)
30 #define ETH_DLY_GTXC_STAGES GENMASK(4, 0)
31 #define ETH_DLY_TXC_INV BIT(20)
32 #define ETH_DLY_TXC_ENABLE BIT(19)
33 #define ETH_DLY_TXC_STAGES GENMASK(18, 14)
34 #define ETH_DLY_RXC_INV BIT(13)
35 #define ETH_DLY_RXC_ENABLE BIT(12)
36 #define ETH_DLY_RXC_STAGES GENMASK(11, 7)
38 #define PERI_ETH_DLY_FINE 0x800
39 #define ETH_RMII_DLY_TX_INV BIT(2)
40 #define ETH_FINE_DLY_GTXC BIT(1)
41 #define ETH_FINE_DLY_RXC BIT(0)
43 struct mac_delay_struct {
50 struct mediatek_dwmac_plat_data {
51 const struct mediatek_dwmac_variant *variant;
52 struct mac_delay_struct mac_delay;
53 struct clk_bulk_data *clks;
54 struct device_node *np;
55 struct regmap *peri_regmap;
61 struct mediatek_dwmac_variant {
62 int (*dwmac_set_phy_interface)(struct mediatek_dwmac_plat_data *plat);
63 int (*dwmac_set_delay)(struct mediatek_dwmac_plat_data *plat);
65 /* clock ids to be requested */
66 const char * const *clk_list;
74 /* list of clocks required for mac */
75 static const char * const mt2712_dwmac_clk_l[] = {
76 "axi", "apb", "mac_main", "ptp_ref"
79 static int mt2712_set_interface(struct mediatek_dwmac_plat_data *plat)
81 int rmii_rxc = plat->rmii_rxc ? RMII_CLK_SRC_RXC : 0;
84 /* select phy interface in top control domain */
85 switch (plat->phy_mode) {
86 case PHY_INTERFACE_MODE_MII:
87 intf_val |= PHY_INTF_MII;
89 case PHY_INTERFACE_MODE_RMII:
90 intf_val |= (PHY_INTF_RMII | rmii_rxc);
92 case PHY_INTERFACE_MODE_RGMII:
93 case PHY_INTERFACE_MODE_RGMII_TXID:
94 case PHY_INTERFACE_MODE_RGMII_RXID:
95 case PHY_INTERFACE_MODE_RGMII_ID:
96 intf_val |= PHY_INTF_RGMII;
99 dev_err(plat->dev, "phy interface not supported\n");
103 regmap_write(plat->peri_regmap, PERI_ETH_PHY_INTF_SEL, intf_val);
108 static void mt2712_delay_ps2stage(struct mediatek_dwmac_plat_data *plat)
110 struct mac_delay_struct *mac_delay = &plat->mac_delay;
112 switch (plat->phy_mode) {
113 case PHY_INTERFACE_MODE_MII:
114 case PHY_INTERFACE_MODE_RMII:
115 /* 550ps per stage for MII/RMII */
116 mac_delay->tx_delay /= 550;
117 mac_delay->rx_delay /= 550;
119 case PHY_INTERFACE_MODE_RGMII:
120 case PHY_INTERFACE_MODE_RGMII_TXID:
121 case PHY_INTERFACE_MODE_RGMII_RXID:
122 case PHY_INTERFACE_MODE_RGMII_ID:
123 /* 170ps per stage for RGMII */
124 mac_delay->tx_delay /= 170;
125 mac_delay->rx_delay /= 170;
128 dev_err(plat->dev, "phy interface not supported\n");
133 static int mt2712_set_delay(struct mediatek_dwmac_plat_data *plat)
135 struct mac_delay_struct *mac_delay = &plat->mac_delay;
136 u32 delay_val = 0, fine_val = 0;
138 mt2712_delay_ps2stage(plat);
140 switch (plat->phy_mode) {
141 case PHY_INTERFACE_MODE_MII:
142 delay_val |= FIELD_PREP(ETH_DLY_TXC_ENABLE, !!mac_delay->tx_delay);
143 delay_val |= FIELD_PREP(ETH_DLY_TXC_STAGES, mac_delay->tx_delay);
144 delay_val |= FIELD_PREP(ETH_DLY_TXC_INV, mac_delay->tx_inv);
146 delay_val |= FIELD_PREP(ETH_DLY_RXC_ENABLE, !!mac_delay->rx_delay);
147 delay_val |= FIELD_PREP(ETH_DLY_RXC_STAGES, mac_delay->rx_delay);
148 delay_val |= FIELD_PREP(ETH_DLY_RXC_INV, mac_delay->rx_inv);
150 case PHY_INTERFACE_MODE_RMII:
151 /* the rmii reference clock is from external phy,
152 * and the property "rmii_rxc" indicates which pin(TXC/RXC)
153 * the reference clk is connected to. The reference clock is a
154 * received signal, so rx_delay/rx_inv are used to indicate
155 * the reference clock timing adjustment
157 if (plat->rmii_rxc) {
158 /* the rmii reference clock from outside is connected
159 * to RXC pin, the reference clock will be adjusted
160 * by RXC delay macro circuit.
162 delay_val |= FIELD_PREP(ETH_DLY_RXC_ENABLE, !!mac_delay->rx_delay);
163 delay_val |= FIELD_PREP(ETH_DLY_RXC_STAGES, mac_delay->rx_delay);
164 delay_val |= FIELD_PREP(ETH_DLY_RXC_INV, mac_delay->rx_inv);
166 /* the rmii reference clock from outside is connected
167 * to TXC pin, the reference clock will be adjusted
168 * by TXC delay macro circuit.
170 delay_val |= FIELD_PREP(ETH_DLY_TXC_ENABLE, !!mac_delay->rx_delay);
171 delay_val |= FIELD_PREP(ETH_DLY_TXC_STAGES, mac_delay->rx_delay);
172 delay_val |= FIELD_PREP(ETH_DLY_TXC_INV, mac_delay->rx_inv);
174 /* tx_inv will inverse the tx clock inside mac relateive to
175 * reference clock from external phy,
176 * and this bit is located in the same register with fine-tune
178 if (mac_delay->tx_inv)
179 fine_val = ETH_RMII_DLY_TX_INV;
181 case PHY_INTERFACE_MODE_RGMII:
182 case PHY_INTERFACE_MODE_RGMII_TXID:
183 case PHY_INTERFACE_MODE_RGMII_RXID:
184 case PHY_INTERFACE_MODE_RGMII_ID:
185 fine_val = ETH_FINE_DLY_GTXC | ETH_FINE_DLY_RXC;
187 delay_val |= FIELD_PREP(ETH_DLY_GTXC_ENABLE, !!mac_delay->tx_delay);
188 delay_val |= FIELD_PREP(ETH_DLY_GTXC_STAGES, mac_delay->tx_delay);
189 delay_val |= FIELD_PREP(ETH_DLY_GTXC_INV, mac_delay->tx_inv);
191 delay_val |= FIELD_PREP(ETH_DLY_RXC_ENABLE, !!mac_delay->rx_delay);
192 delay_val |= FIELD_PREP(ETH_DLY_RXC_STAGES, mac_delay->rx_delay);
193 delay_val |= FIELD_PREP(ETH_DLY_RXC_INV, mac_delay->rx_inv);
196 dev_err(plat->dev, "phy interface not supported\n");
199 regmap_write(plat->peri_regmap, PERI_ETH_DLY, delay_val);
200 regmap_write(plat->peri_regmap, PERI_ETH_DLY_FINE, fine_val);
205 static const struct mediatek_dwmac_variant mt2712_gmac_variant = {
206 .dwmac_set_phy_interface = mt2712_set_interface,
207 .dwmac_set_delay = mt2712_set_delay,
208 .clk_list = mt2712_dwmac_clk_l,
209 .num_clks = ARRAY_SIZE(mt2712_dwmac_clk_l),
211 .rx_delay_max = 17600,
212 .tx_delay_max = 17600,
215 static int mediatek_dwmac_config_dt(struct mediatek_dwmac_plat_data *plat)
217 struct mac_delay_struct *mac_delay = &plat->mac_delay;
218 u32 tx_delay_ps, rx_delay_ps;
220 plat->peri_regmap = syscon_regmap_lookup_by_phandle(plat->np, "mediatek,pericfg");
221 if (IS_ERR(plat->peri_regmap)) {
222 dev_err(plat->dev, "Failed to get pericfg syscon\n");
223 return PTR_ERR(plat->peri_regmap);
226 plat->phy_mode = of_get_phy_mode(plat->np);
227 if (plat->phy_mode < 0) {
228 dev_err(plat->dev, "not find phy-mode\n");
232 if (!of_property_read_u32(plat->np, "mediatek,tx-delay-ps", &tx_delay_ps)) {
233 if (tx_delay_ps < plat->variant->tx_delay_max) {
234 mac_delay->tx_delay = tx_delay_ps;
236 dev_err(plat->dev, "Invalid TX clock delay: %dps\n", tx_delay_ps);
241 if (!of_property_read_u32(plat->np, "mediatek,rx-delay-ps", &rx_delay_ps)) {
242 if (rx_delay_ps < plat->variant->rx_delay_max) {
243 mac_delay->rx_delay = rx_delay_ps;
245 dev_err(plat->dev, "Invalid RX clock delay: %dps\n", rx_delay_ps);
250 mac_delay->tx_inv = of_property_read_bool(plat->np, "mediatek,txc-inverse");
251 mac_delay->rx_inv = of_property_read_bool(plat->np, "mediatek,rxc-inverse");
252 plat->rmii_rxc = of_property_read_bool(plat->np, "mediatek,rmii-rxc");
257 static int mediatek_dwmac_clk_init(struct mediatek_dwmac_plat_data *plat)
259 const struct mediatek_dwmac_variant *variant = plat->variant;
260 int i, num = variant->num_clks;
262 plat->clks = devm_kcalloc(plat->dev, num, sizeof(*plat->clks), GFP_KERNEL);
266 for (i = 0; i < num; i++)
267 plat->clks[i].id = variant->clk_list[i];
269 return devm_clk_bulk_get(plat->dev, num, plat->clks);
272 static int mediatek_dwmac_init(struct platform_device *pdev, void *priv)
274 struct mediatek_dwmac_plat_data *plat = priv;
275 const struct mediatek_dwmac_variant *variant = plat->variant;
278 ret = dma_set_mask_and_coherent(plat->dev, DMA_BIT_MASK(variant->dma_bit_mask));
280 dev_err(plat->dev, "No suitable DMA available, err = %d\n", ret);
284 ret = variant->dwmac_set_phy_interface(plat);
286 dev_err(plat->dev, "failed to set phy interface, err = %d\n", ret);
290 ret = variant->dwmac_set_delay(plat);
292 dev_err(plat->dev, "failed to set delay value, err = %d\n", ret);
296 ret = clk_bulk_prepare_enable(variant->num_clks, plat->clks);
298 dev_err(plat->dev, "failed to enable clks, err = %d\n", ret);
302 pm_runtime_enable(&pdev->dev);
303 pm_runtime_get_sync(&pdev->dev);
308 static void mediatek_dwmac_exit(struct platform_device *pdev, void *priv)
310 struct mediatek_dwmac_plat_data *plat = priv;
311 const struct mediatek_dwmac_variant *variant = plat->variant;
313 clk_bulk_disable_unprepare(variant->num_clks, plat->clks);
315 pm_runtime_put_sync(&pdev->dev);
316 pm_runtime_disable(&pdev->dev);
319 static int mediatek_dwmac_probe(struct platform_device *pdev)
321 struct mediatek_dwmac_plat_data *priv_plat;
322 struct plat_stmmacenet_data *plat_dat;
323 struct stmmac_resources stmmac_res;
326 priv_plat = devm_kzalloc(&pdev->dev, sizeof(*priv_plat), GFP_KERNEL);
330 priv_plat->variant = of_device_get_match_data(&pdev->dev);
331 if (!priv_plat->variant) {
332 dev_err(&pdev->dev, "Missing dwmac-mediatek variant\n");
336 priv_plat->dev = &pdev->dev;
337 priv_plat->np = pdev->dev.of_node;
339 ret = mediatek_dwmac_config_dt(priv_plat);
343 ret = mediatek_dwmac_clk_init(priv_plat);
347 ret = stmmac_get_platform_resources(pdev, &stmmac_res);
351 plat_dat = stmmac_probe_config_dt(pdev, &stmmac_res.mac);
352 if (IS_ERR(plat_dat))
353 return PTR_ERR(plat_dat);
355 plat_dat->interface = priv_plat->phy_mode;
356 plat_dat->has_gmac4 = 1;
357 plat_dat->has_gmac = 0;
359 plat_dat->riwt_off = 1;
360 plat_dat->maxmtu = ETH_DATA_LEN;
361 plat_dat->bsp_priv = priv_plat;
362 plat_dat->init = mediatek_dwmac_init;
363 plat_dat->exit = mediatek_dwmac_exit;
364 mediatek_dwmac_init(pdev, priv_plat);
366 ret = stmmac_dvr_probe(&pdev->dev, plat_dat, &stmmac_res);
368 stmmac_remove_config_dt(pdev, plat_dat);
375 static const struct of_device_id mediatek_dwmac_match[] = {
376 { .compatible = "mediatek,mt2712-gmac",
377 .data = &mt2712_gmac_variant },
381 MODULE_DEVICE_TABLE(of, mediatek_dwmac_match);
383 static struct platform_driver mediatek_dwmac_driver = {
384 .probe = mediatek_dwmac_probe,
385 .remove = stmmac_pltfr_remove,
387 .name = "dwmac-mediatek",
388 .pm = &stmmac_pltfr_pm_ops,
389 .of_match_table = mediatek_dwmac_match,
392 module_platform_driver(mediatek_dwmac_driver);
394 MODULE_AUTHOR("Biao Huang <biao.huang@mediatek.com>");
395 MODULE_DESCRIPTION("MediaTek DWMAC specific glue layer");
396 MODULE_LICENSE("GPL v2");