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_MASK GENMASK(4, 4)
35 #define PRG_ETH0_TXDLY_SHIFT 5
36 #define PRG_ETH0_TXDLY_MASK GENMASK(6, 5)
38 /* divider for the result of m250_sel */
39 #define PRG_ETH0_CLK_M250_DIV_SHIFT 7
40 #define PRG_ETH0_CLK_M250_DIV_WIDTH 3
42 /* divides the result of m25_sel by either 5 (bit unset) or 10 (bit set) */
43 #define PRG_ETH0_CLK_M25_DIV_SHIFT 10
44 #define PRG_ETH0_CLK_M25_DIV_WIDTH 1
46 #define PRG_ETH0_INVERTED_RMII_CLK BIT(11)
47 #define PRG_ETH0_TX_AND_PHY_REF_CLK BIT(12)
49 #define MUX_CLK_NUM_PARENTS 2
51 struct meson8b_dwmac {
52 struct platform_device *pdev;
56 phy_interface_t phy_mode;
58 struct clk_mux m250_mux;
59 struct clk *m250_mux_clk;
60 struct clk *m250_mux_parent[MUX_CLK_NUM_PARENTS];
62 struct clk_divider m250_div;
63 struct clk *m250_div_clk;
65 struct clk_divider m25_div;
66 struct clk *m25_div_clk;
71 static void meson8b_dwmac_mask_bits(struct meson8b_dwmac *dwmac, u32 reg,
76 data = readl(dwmac->regs + reg);
78 data |= (value & mask);
80 writel(data, dwmac->regs + reg);
83 static int meson8b_init_clk(struct meson8b_dwmac *dwmac)
85 struct clk_init_data init;
87 struct device *dev = &dwmac->pdev->dev;
89 const char *clk_div_parents[1];
90 const char *mux_parent_names[MUX_CLK_NUM_PARENTS];
91 static const struct clk_div_table clk_25m_div_table[] = {
92 { .val = 0, .div = 5 },
93 { .val = 1, .div = 10 },
97 /* get the mux parents from DT */
98 for (i = 0; i < MUX_CLK_NUM_PARENTS; i++) {
101 snprintf(name, sizeof(name), "clkin%d", i);
102 dwmac->m250_mux_parent[i] = devm_clk_get(dev, name);
103 if (IS_ERR(dwmac->m250_mux_parent[i])) {
104 ret = PTR_ERR(dwmac->m250_mux_parent[i]);
105 if (ret != -EPROBE_DEFER)
106 dev_err(dev, "Missing clock %s\n", name);
110 mux_parent_names[i] =
111 __clk_get_name(dwmac->m250_mux_parent[i]);
114 /* create the m250_mux */
115 snprintf(clk_name, sizeof(clk_name), "%s#m250_sel", dev_name(dev));
116 init.name = clk_name;
117 init.ops = &clk_mux_ops;
118 init.flags = CLK_SET_RATE_PARENT;
119 init.parent_names = mux_parent_names;
120 init.num_parents = MUX_CLK_NUM_PARENTS;
122 dwmac->m250_mux.reg = dwmac->regs + PRG_ETH0;
123 dwmac->m250_mux.shift = __ffs(PRG_ETH0_CLK_M250_SEL_MASK);
124 dwmac->m250_mux.mask = PRG_ETH0_CLK_M250_SEL_MASK >>
125 dwmac->m250_mux.shift;
126 dwmac->m250_mux.flags = 0;
127 dwmac->m250_mux.table = NULL;
128 dwmac->m250_mux.hw.init = &init;
130 dwmac->m250_mux_clk = devm_clk_register(dev, &dwmac->m250_mux.hw);
131 if (WARN_ON(IS_ERR(dwmac->m250_mux_clk)))
132 return PTR_ERR(dwmac->m250_mux_clk);
134 /* create the m250_div */
135 snprintf(clk_name, sizeof(clk_name), "%s#m250_div", dev_name(dev));
136 init.name = devm_kstrdup(dev, clk_name, GFP_KERNEL);
137 init.ops = &clk_divider_ops;
138 init.flags = CLK_SET_RATE_PARENT;
139 clk_div_parents[0] = __clk_get_name(dwmac->m250_mux_clk);
140 init.parent_names = clk_div_parents;
141 init.num_parents = ARRAY_SIZE(clk_div_parents);
143 dwmac->m250_div.reg = dwmac->regs + PRG_ETH0;
144 dwmac->m250_div.shift = PRG_ETH0_CLK_M250_DIV_SHIFT;
145 dwmac->m250_div.width = PRG_ETH0_CLK_M250_DIV_WIDTH;
146 dwmac->m250_div.hw.init = &init;
147 dwmac->m250_div.flags = CLK_DIVIDER_ONE_BASED |
148 CLK_DIVIDER_ALLOW_ZERO |
149 CLK_DIVIDER_ROUND_CLOSEST;
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;
184 switch (dwmac->phy_mode) {
185 case PHY_INTERFACE_MODE_RGMII:
186 case PHY_INTERFACE_MODE_RGMII_RXID:
187 /* TX clock delay in ns = "8ns / 4 * tx_dly_val" (where
188 * 8ns are exactly one cycle of the 125MHz RGMII TX clock):
189 * 0ns = 0x0, 2ns = 0x1, 4ns = 0x2, 6ns = 0x3
191 tx_dly_val = dwmac->tx_delay_ns >> 1;
194 case PHY_INTERFACE_MODE_RGMII_ID:
195 case PHY_INTERFACE_MODE_RGMII_TXID:
196 /* Generate a 25MHz clock for the PHY */
197 clk_rate = 25 * 1000 * 1000;
199 /* enable RGMII mode */
200 meson8b_dwmac_mask_bits(dwmac, PRG_ETH0, PRG_ETH0_RGMII_MODE,
201 PRG_ETH0_RGMII_MODE);
203 /* only relevant for RMII mode -> disable in RGMII mode */
204 meson8b_dwmac_mask_bits(dwmac, PRG_ETH0,
205 PRG_ETH0_INVERTED_RMII_CLK, 0);
207 meson8b_dwmac_mask_bits(dwmac, PRG_ETH0, PRG_ETH0_TXDLY_MASK,
208 tx_dly_val << PRG_ETH0_TXDLY_SHIFT);
211 case PHY_INTERFACE_MODE_RMII:
212 /* Use the rate of the mux clock for the internal RMII PHY */
213 clk_rate = clk_get_rate(dwmac->m250_mux_clk);
215 /* disable RGMII mode -> enables RMII mode */
216 meson8b_dwmac_mask_bits(dwmac, PRG_ETH0, PRG_ETH0_RGMII_MODE,
219 /* invert internal clk_rmii_i to generate 25/2.5 tx_rx_clk */
220 meson8b_dwmac_mask_bits(dwmac, PRG_ETH0,
221 PRG_ETH0_INVERTED_RMII_CLK,
222 PRG_ETH0_INVERTED_RMII_CLK);
224 /* TX clock delay cannot be configured in RMII mode */
225 meson8b_dwmac_mask_bits(dwmac, PRG_ETH0, PRG_ETH0_TXDLY_MASK,
231 dev_err(&dwmac->pdev->dev, "unsupported phy-mode %s\n",
232 phy_modes(dwmac->phy_mode));
236 ret = clk_prepare_enable(dwmac->m25_div_clk);
238 dev_err(&dwmac->pdev->dev, "failed to enable the PHY clock\n");
242 ret = clk_set_rate(dwmac->m25_div_clk, clk_rate);
244 clk_disable_unprepare(dwmac->m25_div_clk);
246 dev_err(&dwmac->pdev->dev, "failed to set PHY clock\n");
250 /* enable TX_CLK and PHY_REF_CLK generator */
251 meson8b_dwmac_mask_bits(dwmac, PRG_ETH0, PRG_ETH0_TX_AND_PHY_REF_CLK,
252 PRG_ETH0_TX_AND_PHY_REF_CLK);
257 static int meson8b_dwmac_probe(struct platform_device *pdev)
259 struct plat_stmmacenet_data *plat_dat;
260 struct stmmac_resources stmmac_res;
261 struct resource *res;
262 struct meson8b_dwmac *dwmac;
265 ret = stmmac_get_platform_resources(pdev, &stmmac_res);
269 plat_dat = stmmac_probe_config_dt(pdev, &stmmac_res.mac);
270 if (IS_ERR(plat_dat))
271 return PTR_ERR(plat_dat);
273 dwmac = devm_kzalloc(&pdev->dev, sizeof(*dwmac), GFP_KERNEL);
276 goto err_remove_config_dt;
279 res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
280 dwmac->regs = devm_ioremap_resource(&pdev->dev, res);
281 if (IS_ERR(dwmac->regs)) {
282 ret = PTR_ERR(dwmac->regs);
283 goto err_remove_config_dt;
287 dwmac->phy_mode = of_get_phy_mode(pdev->dev.of_node);
288 if ((int)dwmac->phy_mode < 0) {
289 dev_err(&pdev->dev, "missing phy-mode property\n");
291 goto err_remove_config_dt;
294 /* use 2ns as fallback since this value was previously hardcoded */
295 if (of_property_read_u32(pdev->dev.of_node, "amlogic,tx-delay-ns",
296 &dwmac->tx_delay_ns))
297 dwmac->tx_delay_ns = 2;
299 ret = meson8b_init_clk(dwmac);
301 goto err_remove_config_dt;
303 ret = meson8b_init_prg_eth(dwmac);
305 goto err_remove_config_dt;
307 plat_dat->bsp_priv = dwmac;
309 ret = stmmac_dvr_probe(&pdev->dev, plat_dat, &stmmac_res);
311 goto err_clk_disable;
316 clk_disable_unprepare(dwmac->m25_div_clk);
317 err_remove_config_dt:
318 stmmac_remove_config_dt(pdev, plat_dat);
323 static int meson8b_dwmac_remove(struct platform_device *pdev)
325 struct meson8b_dwmac *dwmac = get_stmmac_bsp_priv(&pdev->dev);
327 clk_disable_unprepare(dwmac->m25_div_clk);
329 return stmmac_pltfr_remove(pdev);
332 static const struct of_device_id meson8b_dwmac_match[] = {
333 { .compatible = "amlogic,meson8b-dwmac" },
334 { .compatible = "amlogic,meson-gxbb-dwmac" },
337 MODULE_DEVICE_TABLE(of, meson8b_dwmac_match);
339 static struct platform_driver meson8b_dwmac_driver = {
340 .probe = meson8b_dwmac_probe,
341 .remove = meson8b_dwmac_remove,
343 .name = "meson8b-dwmac",
344 .pm = &stmmac_pltfr_pm_ops,
345 .of_match_table = meson8b_dwmac_match,
348 module_platform_driver(meson8b_dwmac_driver);
350 MODULE_AUTHOR("Martin Blumenstingl <martin.blumenstingl@googlemail.com>");
351 MODULE_DESCRIPTION("Amlogic Meson8b and GXBB DWMAC glue layer");
352 MODULE_LICENSE("GPL v2");