2 * Amlogic Meson8b and GXBB DWMAC glue layer
4 * Copyright (C) 2016 Martin Blumenstingl <martin.blumenstingl@googlemail.com>
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
10 * You should have received a copy of the GNU General Public License
11 * along with this program. If not, see <http://www.gnu.org/licenses/>.
14 #include <linux/clk.h>
15 #include <linux/clk-provider.h>
16 #include <linux/device.h>
17 #include <linux/ethtool.h>
19 #include <linux/ioport.h>
20 #include <linux/module.h>
21 #include <linux/of_net.h>
22 #include <linux/mfd/syscon.h>
23 #include <linux/platform_device.h>
24 #include <linux/stmmac.h>
26 #include "stmmac_platform.h"
30 #define PRG_ETH0_RGMII_MODE BIT(0)
32 /* mux to choose between fclk_div2 (bit unset) and mpll2 (bit set) */
33 #define PRG_ETH0_CLK_M250_SEL_SHIFT 4
34 #define PRG_ETH0_CLK_M250_SEL_MASK GENMASK(4, 4)
36 #define PRG_ETH0_TXDLY_SHIFT 5
37 #define PRG_ETH0_TXDLY_MASK GENMASK(6, 5)
38 #define PRG_ETH0_TXDLY_OFF (0x0 << PRG_ETH0_TXDLY_SHIFT)
39 #define PRG_ETH0_TXDLY_QUARTER (0x1 << PRG_ETH0_TXDLY_SHIFT)
40 #define PRG_ETH0_TXDLY_HALF (0x2 << PRG_ETH0_TXDLY_SHIFT)
41 #define PRG_ETH0_TXDLY_THREE_QUARTERS (0x3 << PRG_ETH0_TXDLY_SHIFT)
43 /* divider for the result of m250_sel */
44 #define PRG_ETH0_CLK_M250_DIV_SHIFT 7
45 #define PRG_ETH0_CLK_M250_DIV_WIDTH 3
47 /* divides the result of m25_sel by either 5 (bit unset) or 10 (bit set) */
48 #define PRG_ETH0_CLK_M25_DIV_SHIFT 10
49 #define PRG_ETH0_CLK_M25_DIV_WIDTH 1
51 #define PRG_ETH0_INVERTED_RMII_CLK BIT(11)
52 #define PRG_ETH0_TX_AND_PHY_REF_CLK BIT(12)
54 #define MUX_CLK_NUM_PARENTS 2
56 struct meson8b_dwmac {
57 struct platform_device *pdev;
61 phy_interface_t phy_mode;
63 struct clk_mux m250_mux;
64 struct clk *m250_mux_clk;
65 struct clk *m250_mux_parent[MUX_CLK_NUM_PARENTS];
67 struct clk_divider m250_div;
68 struct clk *m250_div_clk;
70 struct clk_divider m25_div;
71 struct clk *m25_div_clk;
74 static void meson8b_dwmac_mask_bits(struct meson8b_dwmac *dwmac, u32 reg,
79 data = readl(dwmac->regs + reg);
81 data |= (value & mask);
83 writel(data, dwmac->regs + reg);
86 static int meson8b_init_clk(struct meson8b_dwmac *dwmac)
88 struct clk_init_data init;
90 struct device *dev = &dwmac->pdev->dev;
92 const char *clk_div_parents[1];
93 const char *mux_parent_names[MUX_CLK_NUM_PARENTS];
94 static struct clk_div_table clk_25m_div_table[] = {
95 { .val = 0, .div = 5 },
96 { .val = 1, .div = 10 },
100 /* get the mux parents from DT */
101 for (i = 0; i < MUX_CLK_NUM_PARENTS; i++) {
104 snprintf(name, sizeof(name), "clkin%d", i);
105 dwmac->m250_mux_parent[i] = devm_clk_get(dev, name);
106 if (IS_ERR(dwmac->m250_mux_parent[i])) {
107 ret = PTR_ERR(dwmac->m250_mux_parent[i]);
108 if (ret != -EPROBE_DEFER)
109 dev_err(dev, "Missing clock %s\n", name);
113 mux_parent_names[i] =
114 __clk_get_name(dwmac->m250_mux_parent[i]);
117 /* create the m250_mux */
118 snprintf(clk_name, sizeof(clk_name), "%s#m250_sel", dev_name(dev));
119 init.name = clk_name;
120 init.ops = &clk_mux_ops;
122 init.parent_names = mux_parent_names;
123 init.num_parents = MUX_CLK_NUM_PARENTS;
125 dwmac->m250_mux.reg = dwmac->regs + PRG_ETH0;
126 dwmac->m250_mux.shift = PRG_ETH0_CLK_M250_SEL_SHIFT;
127 dwmac->m250_mux.mask = PRG_ETH0_CLK_M250_SEL_MASK;
128 dwmac->m250_mux.flags = 0;
129 dwmac->m250_mux.table = NULL;
130 dwmac->m250_mux.hw.init = &init;
132 dwmac->m250_mux_clk = devm_clk_register(dev, &dwmac->m250_mux.hw);
133 if (WARN_ON(IS_ERR(dwmac->m250_mux_clk)))
134 return PTR_ERR(dwmac->m250_mux_clk);
136 /* create the m250_div */
137 snprintf(clk_name, sizeof(clk_name), "%s#m250_div", dev_name(dev));
138 init.name = devm_kstrdup(dev, clk_name, GFP_KERNEL);
139 init.ops = &clk_divider_ops;
140 init.flags = CLK_SET_RATE_PARENT;
141 clk_div_parents[0] = __clk_get_name(dwmac->m250_mux_clk);
142 init.parent_names = clk_div_parents;
143 init.num_parents = ARRAY_SIZE(clk_div_parents);
145 dwmac->m250_div.reg = dwmac->regs + PRG_ETH0;
146 dwmac->m250_div.shift = PRG_ETH0_CLK_M250_DIV_SHIFT;
147 dwmac->m250_div.width = PRG_ETH0_CLK_M250_DIV_WIDTH;
148 dwmac->m250_div.hw.init = &init;
149 dwmac->m250_div.flags = CLK_DIVIDER_ONE_BASED | CLK_DIVIDER_ALLOW_ZERO;
151 dwmac->m250_div_clk = devm_clk_register(dev, &dwmac->m250_div.hw);
152 if (WARN_ON(IS_ERR(dwmac->m250_div_clk)))
153 return PTR_ERR(dwmac->m250_div_clk);
155 /* create the m25_div */
156 snprintf(clk_name, sizeof(clk_name), "%s#m25_div", dev_name(dev));
157 init.name = devm_kstrdup(dev, clk_name, GFP_KERNEL);
158 init.ops = &clk_divider_ops;
159 init.flags = CLK_IS_BASIC | CLK_SET_RATE_PARENT;
160 clk_div_parents[0] = __clk_get_name(dwmac->m250_div_clk);
161 init.parent_names = clk_div_parents;
162 init.num_parents = ARRAY_SIZE(clk_div_parents);
164 dwmac->m25_div.reg = dwmac->regs + PRG_ETH0;
165 dwmac->m25_div.shift = PRG_ETH0_CLK_M25_DIV_SHIFT;
166 dwmac->m25_div.width = PRG_ETH0_CLK_M25_DIV_WIDTH;
167 dwmac->m25_div.table = clk_25m_div_table;
168 dwmac->m25_div.hw.init = &init;
169 dwmac->m25_div.flags = CLK_DIVIDER_ALLOW_ZERO;
171 dwmac->m25_div_clk = devm_clk_register(dev, &dwmac->m25_div.hw);
172 if (WARN_ON(IS_ERR(dwmac->m25_div_clk)))
173 return PTR_ERR(dwmac->m25_div_clk);
178 static int meson8b_init_prg_eth(struct meson8b_dwmac *dwmac)
181 unsigned long clk_rate;
183 switch (dwmac->phy_mode) {
184 case PHY_INTERFACE_MODE_RGMII:
185 case PHY_INTERFACE_MODE_RGMII_ID:
186 case PHY_INTERFACE_MODE_RGMII_RXID:
187 case PHY_INTERFACE_MODE_RGMII_TXID:
188 /* Generate a 25MHz clock for the PHY */
189 clk_rate = 25 * 1000 * 1000;
191 /* enable RGMII mode */
192 meson8b_dwmac_mask_bits(dwmac, PRG_ETH0, PRG_ETH0_RGMII_MODE,
193 PRG_ETH0_RGMII_MODE);
195 /* only relevant for RMII mode -> disable in RGMII mode */
196 meson8b_dwmac_mask_bits(dwmac, PRG_ETH0,
197 PRG_ETH0_INVERTED_RMII_CLK, 0);
199 /* TX clock delay - all known boards use a 1/4 cycle delay */
200 meson8b_dwmac_mask_bits(dwmac, PRG_ETH0, PRG_ETH0_TXDLY_MASK,
201 PRG_ETH0_TXDLY_QUARTER);
204 case PHY_INTERFACE_MODE_RMII:
205 /* Use the rate of the mux clock for the internal RMII PHY */
206 clk_rate = clk_get_rate(dwmac->m250_mux_clk);
208 /* disable RGMII mode -> enables RMII mode */
209 meson8b_dwmac_mask_bits(dwmac, PRG_ETH0, PRG_ETH0_RGMII_MODE,
212 /* invert internal clk_rmii_i to generate 25/2.5 tx_rx_clk */
213 meson8b_dwmac_mask_bits(dwmac, PRG_ETH0,
214 PRG_ETH0_INVERTED_RMII_CLK,
215 PRG_ETH0_INVERTED_RMII_CLK);
217 /* TX clock delay cannot be configured in RMII mode */
218 meson8b_dwmac_mask_bits(dwmac, PRG_ETH0, PRG_ETH0_TXDLY_MASK,
224 dev_err(&dwmac->pdev->dev, "unsupported phy-mode %s\n",
225 phy_modes(dwmac->phy_mode));
229 ret = clk_prepare_enable(dwmac->m25_div_clk);
231 dev_err(&dwmac->pdev->dev, "failed to enable the PHY clock\n");
235 ret = clk_set_rate(dwmac->m25_div_clk, clk_rate);
237 clk_disable_unprepare(dwmac->m25_div_clk);
239 dev_err(&dwmac->pdev->dev, "failed to set PHY clock\n");
243 /* enable TX_CLK and PHY_REF_CLK generator */
244 meson8b_dwmac_mask_bits(dwmac, PRG_ETH0, PRG_ETH0_TX_AND_PHY_REF_CLK,
245 PRG_ETH0_TX_AND_PHY_REF_CLK);
250 static int meson8b_dwmac_probe(struct platform_device *pdev)
252 struct plat_stmmacenet_data *plat_dat;
253 struct stmmac_resources stmmac_res;
254 struct resource *res;
255 struct meson8b_dwmac *dwmac;
258 ret = stmmac_get_platform_resources(pdev, &stmmac_res);
262 plat_dat = stmmac_probe_config_dt(pdev, &stmmac_res.mac);
263 if (IS_ERR(plat_dat))
264 return PTR_ERR(plat_dat);
266 dwmac = devm_kzalloc(&pdev->dev, sizeof(*dwmac), GFP_KERNEL);
269 goto err_remove_config_dt;
272 res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
273 dwmac->regs = devm_ioremap_resource(&pdev->dev, res);
274 if (IS_ERR(dwmac->regs)) {
275 ret = PTR_ERR(dwmac->regs);
276 goto err_remove_config_dt;
280 dwmac->phy_mode = of_get_phy_mode(pdev->dev.of_node);
281 if (dwmac->phy_mode < 0) {
282 dev_err(&pdev->dev, "missing phy-mode property\n");
284 goto err_remove_config_dt;
287 ret = meson8b_init_clk(dwmac);
289 goto err_remove_config_dt;
291 ret = meson8b_init_prg_eth(dwmac);
293 goto err_remove_config_dt;
295 plat_dat->bsp_priv = dwmac;
297 ret = stmmac_dvr_probe(&pdev->dev, plat_dat, &stmmac_res);
299 goto err_clk_disable;
304 clk_disable_unprepare(dwmac->m25_div_clk);
305 err_remove_config_dt:
306 stmmac_remove_config_dt(pdev, plat_dat);
311 static int meson8b_dwmac_remove(struct platform_device *pdev)
313 struct meson8b_dwmac *dwmac = get_stmmac_bsp_priv(&pdev->dev);
315 clk_disable_unprepare(dwmac->m25_div_clk);
317 return stmmac_pltfr_remove(pdev);
320 static const struct of_device_id meson8b_dwmac_match[] = {
321 { .compatible = "amlogic,meson8b-dwmac" },
322 { .compatible = "amlogic,meson-gxbb-dwmac" },
325 MODULE_DEVICE_TABLE(of, meson8b_dwmac_match);
327 static struct platform_driver meson8b_dwmac_driver = {
328 .probe = meson8b_dwmac_probe,
329 .remove = meson8b_dwmac_remove,
331 .name = "meson8b-dwmac",
332 .pm = &stmmac_pltfr_pm_ops,
333 .of_match_table = meson8b_dwmac_match,
336 module_platform_driver(meson8b_dwmac_driver);
338 MODULE_AUTHOR("Martin Blumenstingl <martin.blumenstingl@googlemail.com>");
339 MODULE_DESCRIPTION("Amlogic Meson8b and GXBB DWMAC glue layer");
340 MODULE_LICENSE("GPL v2");