1 // SPDX-License-Identifier: GPL-2.0-or-later
3  * dwmac-sti.c - STMicroelectronics DWMAC Specific Glue layer
5  * Copyright (C) 2003-2014 STMicroelectronics (R&D) Limited
18 #include <linux/clk.h>
40  * ------------------------------------------------
43  * ------------------------------------------------
45  *|		|  clk-125/txclk |	txclk	   |
46  * ------------------------------------------------
48  *|		|  clk-125/txclk |	clkgen     |
50  * ------------------------------------------------
51  *|	RMII	|	n/a	 |	25Mhz	   |
52  *|		|		 |clkgen/phyclk-in |
53  * ------------------------------------------------
56  *-------------------------------
58  *-------------------------------
60  *-------------------------------
62  *-------------------------------
64  *-------------------------------
66  *-------------------------------
81  *	000-GMII/MII
82  *	001-RGMII
83  *	010-SGMII
84  *	100-RMII
97 	struct clk *clk;	/* PHY clock */  member
98 	u32 ctrl_reg;		/* GMAC glue-logic control register */
99 	int clk_sel_reg;	/* GMAC ext clk selection register */
138 	u32 src = dwmac->tx_retime_src;  in stih4xx_fix_retime_src()
139 	u32 reg = dwmac->ctrl_reg;  in stih4xx_fix_retime_src()
142 	if (dwmac->interface == PHY_INTERFACE_MODE_MII) {  in stih4xx_fix_retime_src()
144 	} else if (dwmac->interface == PHY_INTERFACE_MODE_RMII) {  in stih4xx_fix_retime_src()
145 		if (dwmac->ext_phyclk) {  in stih4xx_fix_retime_src()
151 	} else if (IS_PHY_IF_MODE_RGMII(dwmac->interface)) {  in stih4xx_fix_retime_src()
152 		/* On GiGa clk source can be either ext or from clkgen */  in stih4xx_fix_retime_src()
161 		clk_set_rate(dwmac->clk, freq);  in stih4xx_fix_retime_src()
163 	regmap_update_bits(dwmac->regmap, reg, STIH4XX_RETIME_SRC_MASK,  in stih4xx_fix_retime_src()
169 	struct regmap *regmap = dwmac->regmap;  in sti_dwmac_set_mode()
170 	int iface = dwmac->interface;  in sti_dwmac_set_mode()
171 	u32 reg = dwmac->ctrl_reg;  in sti_dwmac_set_mode()
174 	if (dwmac->gmac_en)  in sti_dwmac_set_mode()
182 	dwmac->fix_retime_src(dwmac, dwmac->speed, 0);  in sti_dwmac_set_mode()
191 	struct device *dev = &pdev->dev;  in sti_dwmac_parse_data()
192 	struct device_node *np = dev->of_node;  in sti_dwmac_parse_data()
196 	/* clk selection from extra syscfg register */  in sti_dwmac_parse_data()
197 	dwmac->clk_sel_reg = -ENXIO;  in sti_dwmac_parse_data()
198 	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "sti-clkconf");  in sti_dwmac_parse_data()
200 		dwmac->clk_sel_reg = res->start;  in sti_dwmac_parse_data()
203 						      1, &dwmac->ctrl_reg);  in sti_dwmac_parse_data()
207 	err = of_get_phy_mode(np, &dwmac->interface);  in sti_dwmac_parse_data()
208 	if (err && err != -ENODEV) {  in sti_dwmac_parse_data()
209 		dev_err(dev, "Can't get phy-mode\n");  in sti_dwmac_parse_data()
213 	dwmac->regmap = regmap;  in sti_dwmac_parse_data()
214 	dwmac->gmac_en = of_property_read_bool(np, "st,gmac_en");  in sti_dwmac_parse_data()
215 	dwmac->ext_phyclk = of_property_read_bool(np, "st,ext-phyclk");  in sti_dwmac_parse_data()
216 	dwmac->tx_retime_src = TX_RETIME_SRC_NA;  in sti_dwmac_parse_data()
217 	dwmac->speed = SPEED_100;  in sti_dwmac_parse_data()
219 	if (IS_PHY_IF_MODE_GBIT(dwmac->interface)) {  in sti_dwmac_parse_data()
222 		dwmac->tx_retime_src = TX_RETIME_SRC_CLKGEN;  in sti_dwmac_parse_data()
224 		err = of_property_read_string(np, "st,tx-retime-src", &rs);  in sti_dwmac_parse_data()
226 			dev_warn(dev, "Use internal clock source\n");  in sti_dwmac_parse_data()
229 				dwmac->tx_retime_src = TX_RETIME_SRC_CLK_125;  in sti_dwmac_parse_data()
231 				dwmac->tx_retime_src = TX_RETIME_SRC_TXCLK;  in sti_dwmac_parse_data()
233 		dwmac->speed = SPEED_1000;  in sti_dwmac_parse_data()
236 	dwmac->clk = devm_clk_get(dev, "sti-ethclk");  in sti_dwmac_parse_data()
237 	if (IS_ERR(dwmac->clk)) {  in sti_dwmac_parse_data()
239 		dwmac->clk = NULL;  in sti_dwmac_parse_data()
253 	data = of_device_get_match_data(&pdev->dev);  in sti_dwmac_probe()
255 		dev_err(&pdev->dev, "No OF match data provided\n");  in sti_dwmac_probe()
256 		return -EINVAL;  in sti_dwmac_probe()
267 	dwmac = devm_kzalloc(&pdev->dev, sizeof(*dwmac), GFP_KERNEL);  in sti_dwmac_probe()
269 		return -ENOMEM;  in sti_dwmac_probe()
273 		dev_err(&pdev->dev, "Unable to parse OF data\n");  in sti_dwmac_probe()
277 	dwmac->fix_retime_src = data->fix_retime_src;  in sti_dwmac_probe()
279 	plat_dat->bsp_priv = dwmac;  in sti_dwmac_probe()
280 	plat_dat->fix_mac_speed = data->fix_retime_src;  in sti_dwmac_probe()
282 	ret = clk_prepare_enable(dwmac->clk);  in sti_dwmac_probe()
290 	ret = stmmac_dvr_probe(&pdev->dev, plat_dat, &stmmac_res);  in sti_dwmac_probe()
297 	clk_disable_unprepare(dwmac->clk);  in sti_dwmac_probe()
304 	struct sti_dwmac *dwmac = get_stmmac_bsp_priv(&pdev->dev);  in sti_dwmac_remove()
306 	stmmac_dvr_remove(&pdev->dev);  in sti_dwmac_remove()
308 	clk_disable_unprepare(dwmac->clk);  in sti_dwmac_remove()
316 	clk_disable_unprepare(dwmac->clk);  in sti_dwmac_suspend()
325 	clk_prepare_enable(dwmac->clk);  in sti_dwmac_resume()
339 	{ .compatible = "st,stih407-dwmac", .data = &stih4xx_dwmac_data},
348 		.name           = "sti-dwmac",