1 // SPDX-License-Identifier: GPL-2.0-only
3 * Amlogic Meson8b, Meson8m2 and GXBB DWMAC glue layer
5 * Copyright (C) 2016 Martin Blumenstingl <martin.blumenstingl@googlemail.com>
9 #include <linux/clk-provider.h>
10 #include <linux/device.h>
11 #include <linux/ethtool.h>
13 #include <linux/ioport.h>
14 #include <linux/module.h>
15 #include <linux/of_device.h>
16 #include <linux/of_net.h>
17 #include <linux/mfd/syscon.h>
18 #include <linux/platform_device.h>
19 #include <linux/stmmac.h>
21 #include "stmmac_platform.h"
25 #define PRG_ETH0_RGMII_MODE BIT(0)
27 #define PRG_ETH0_EXT_PHY_MODE_MASK GENMASK(2, 0)
28 #define PRG_ETH0_EXT_RGMII_MODE 1
29 #define PRG_ETH0_EXT_RMII_MODE 4
31 /* mux to choose between fclk_div2 (bit unset) and mpll2 (bit set) */
32 #define PRG_ETH0_CLK_M250_SEL_SHIFT 4
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 #define PRG_ETH0_RGMII_TX_CLK_EN 10
44 #define PRG_ETH0_INVERTED_RMII_CLK BIT(11)
45 #define PRG_ETH0_TX_AND_PHY_REF_CLK BIT(12)
47 #define MUX_CLK_NUM_PARENTS 2
51 struct meson8b_dwmac_data {
52 int (*set_phy_mode)(struct meson8b_dwmac *dwmac);
55 struct meson8b_dwmac {
59 const struct meson8b_dwmac_data *data;
60 phy_interface_t phy_mode;
61 struct clk *rgmii_tx_clk;
65 struct meson8b_dwmac_clk_configs {
66 struct clk_mux m250_mux;
67 struct clk_divider m250_div;
68 struct clk_fixed_factor fixed_div2;
69 struct clk_gate rgmii_tx_en;
72 static void meson8b_dwmac_mask_bits(struct meson8b_dwmac *dwmac, u32 reg,
77 data = readl(dwmac->regs + reg);
79 data |= (value & mask);
81 writel(data, dwmac->regs + reg);
84 static struct clk *meson8b_dwmac_register_clk(struct meson8b_dwmac *dwmac,
85 const char *name_suffix,
86 const char **parent_names,
88 const struct clk_ops *ops,
91 struct clk_init_data init;
94 snprintf(clk_name, sizeof(clk_name), "%s#%s", dev_name(dwmac->dev),
99 init.flags = CLK_SET_RATE_PARENT;
100 init.parent_names = parent_names;
101 init.num_parents = num_parents;
105 return devm_clk_register(dwmac->dev, hw);
108 static int meson8b_init_rgmii_tx_clk(struct meson8b_dwmac *dwmac)
112 struct device *dev = dwmac->dev;
113 const char *parent_name, *mux_parent_names[MUX_CLK_NUM_PARENTS];
114 struct meson8b_dwmac_clk_configs *clk_configs;
116 clk_configs = devm_kzalloc(dev, sizeof(*clk_configs), GFP_KERNEL);
120 /* get the mux parents from DT */
121 for (i = 0; i < MUX_CLK_NUM_PARENTS; i++) {
124 snprintf(name, sizeof(name), "clkin%d", i);
125 clk = devm_clk_get(dev, name);
128 if (ret != -EPROBE_DEFER)
129 dev_err(dev, "Missing clock %s\n", name);
133 mux_parent_names[i] = __clk_get_name(clk);
136 clk_configs->m250_mux.reg = dwmac->regs + PRG_ETH0;
137 clk_configs->m250_mux.shift = PRG_ETH0_CLK_M250_SEL_SHIFT;
138 clk_configs->m250_mux.mask = PRG_ETH0_CLK_M250_SEL_MASK;
139 clk = meson8b_dwmac_register_clk(dwmac, "m250_sel", mux_parent_names,
140 MUX_CLK_NUM_PARENTS, &clk_mux_ops,
141 &clk_configs->m250_mux.hw);
142 if (WARN_ON(IS_ERR(clk)))
145 parent_name = __clk_get_name(clk);
146 clk_configs->m250_div.reg = dwmac->regs + PRG_ETH0;
147 clk_configs->m250_div.shift = PRG_ETH0_CLK_M250_DIV_SHIFT;
148 clk_configs->m250_div.width = PRG_ETH0_CLK_M250_DIV_WIDTH;
149 clk_configs->m250_div.flags = CLK_DIVIDER_ONE_BASED |
150 CLK_DIVIDER_ALLOW_ZERO |
151 CLK_DIVIDER_ROUND_CLOSEST;
152 clk = meson8b_dwmac_register_clk(dwmac, "m250_div", &parent_name, 1,
154 &clk_configs->m250_div.hw);
155 if (WARN_ON(IS_ERR(clk)))
158 parent_name = __clk_get_name(clk);
159 clk_configs->fixed_div2.mult = 1;
160 clk_configs->fixed_div2.div = 2;
161 clk = meson8b_dwmac_register_clk(dwmac, "fixed_div2", &parent_name, 1,
162 &clk_fixed_factor_ops,
163 &clk_configs->fixed_div2.hw);
164 if (WARN_ON(IS_ERR(clk)))
167 parent_name = __clk_get_name(clk);
168 clk_configs->rgmii_tx_en.reg = dwmac->regs + PRG_ETH0;
169 clk_configs->rgmii_tx_en.bit_idx = PRG_ETH0_RGMII_TX_CLK_EN;
170 clk = meson8b_dwmac_register_clk(dwmac, "rgmii_tx_en", &parent_name, 1,
172 &clk_configs->rgmii_tx_en.hw);
173 if (WARN_ON(IS_ERR(clk)))
176 dwmac->rgmii_tx_clk = clk;
181 static int meson8b_set_phy_mode(struct meson8b_dwmac *dwmac)
183 switch (dwmac->phy_mode) {
184 case PHY_INTERFACE_MODE_RGMII:
185 case PHY_INTERFACE_MODE_RGMII_RXID:
186 case PHY_INTERFACE_MODE_RGMII_ID:
187 case PHY_INTERFACE_MODE_RGMII_TXID:
188 /* enable RGMII mode */
189 meson8b_dwmac_mask_bits(dwmac, PRG_ETH0,
191 PRG_ETH0_RGMII_MODE);
193 case PHY_INTERFACE_MODE_RMII:
194 /* disable RGMII mode -> enables RMII mode */
195 meson8b_dwmac_mask_bits(dwmac, PRG_ETH0,
196 PRG_ETH0_RGMII_MODE, 0);
199 dev_err(dwmac->dev, "fail to set phy-mode %s\n",
200 phy_modes(dwmac->phy_mode));
207 static int meson_axg_set_phy_mode(struct meson8b_dwmac *dwmac)
209 switch (dwmac->phy_mode) {
210 case PHY_INTERFACE_MODE_RGMII:
211 case PHY_INTERFACE_MODE_RGMII_RXID:
212 case PHY_INTERFACE_MODE_RGMII_ID:
213 case PHY_INTERFACE_MODE_RGMII_TXID:
214 /* enable RGMII mode */
215 meson8b_dwmac_mask_bits(dwmac, PRG_ETH0,
216 PRG_ETH0_EXT_PHY_MODE_MASK,
217 PRG_ETH0_EXT_RGMII_MODE);
219 case PHY_INTERFACE_MODE_RMII:
220 /* disable RGMII mode -> enables RMII mode */
221 meson8b_dwmac_mask_bits(dwmac, PRG_ETH0,
222 PRG_ETH0_EXT_PHY_MODE_MASK,
223 PRG_ETH0_EXT_RMII_MODE);
226 dev_err(dwmac->dev, "fail to set phy-mode %s\n",
227 phy_modes(dwmac->phy_mode));
234 static int meson8b_init_prg_eth(struct meson8b_dwmac *dwmac)
239 switch (dwmac->phy_mode) {
240 case PHY_INTERFACE_MODE_RGMII:
241 case PHY_INTERFACE_MODE_RGMII_RXID:
242 /* TX clock delay in ns = "8ns / 4 * tx_dly_val" (where
243 * 8ns are exactly one cycle of the 125MHz RGMII TX clock):
244 * 0ns = 0x0, 2ns = 0x1, 4ns = 0x2, 6ns = 0x3
246 tx_dly_val = dwmac->tx_delay_ns >> 1;
249 case PHY_INTERFACE_MODE_RGMII_ID:
250 case PHY_INTERFACE_MODE_RGMII_TXID:
251 /* only relevant for RMII mode -> disable in RGMII mode */
252 meson8b_dwmac_mask_bits(dwmac, PRG_ETH0,
253 PRG_ETH0_INVERTED_RMII_CLK, 0);
255 meson8b_dwmac_mask_bits(dwmac, PRG_ETH0, PRG_ETH0_TXDLY_MASK,
256 tx_dly_val << PRG_ETH0_TXDLY_SHIFT);
258 /* Configure the 125MHz RGMII TX clock, the IP block changes
259 * the output automatically (= without us having to configure
260 * a register) based on the line-speed (125MHz for Gbit speeds,
261 * 25MHz for 100Mbit/s and 2.5MHz for 10Mbit/s).
263 ret = clk_set_rate(dwmac->rgmii_tx_clk, 125 * 1000 * 1000);
266 "failed to set RGMII TX clock\n");
270 ret = clk_prepare_enable(dwmac->rgmii_tx_clk);
273 "failed to enable the RGMII TX clock\n");
277 devm_add_action_or_reset(dwmac->dev,
278 (void(*)(void *))clk_disable_unprepare,
279 dwmac->rgmii_tx_clk);
282 case PHY_INTERFACE_MODE_RMII:
283 /* invert internal clk_rmii_i to generate 25/2.5 tx_rx_clk */
284 meson8b_dwmac_mask_bits(dwmac, PRG_ETH0,
285 PRG_ETH0_INVERTED_RMII_CLK,
286 PRG_ETH0_INVERTED_RMII_CLK);
288 /* TX clock delay cannot be configured in RMII mode */
289 meson8b_dwmac_mask_bits(dwmac, PRG_ETH0, PRG_ETH0_TXDLY_MASK,
295 dev_err(dwmac->dev, "unsupported phy-mode %s\n",
296 phy_modes(dwmac->phy_mode));
300 /* enable TX_CLK and PHY_REF_CLK generator */
301 meson8b_dwmac_mask_bits(dwmac, PRG_ETH0, PRG_ETH0_TX_AND_PHY_REF_CLK,
302 PRG_ETH0_TX_AND_PHY_REF_CLK);
307 static int meson8b_dwmac_probe(struct platform_device *pdev)
309 struct plat_stmmacenet_data *plat_dat;
310 struct stmmac_resources stmmac_res;
311 struct meson8b_dwmac *dwmac;
314 ret = stmmac_get_platform_resources(pdev, &stmmac_res);
318 plat_dat = stmmac_probe_config_dt(pdev, &stmmac_res.mac);
319 if (IS_ERR(plat_dat))
320 return PTR_ERR(plat_dat);
322 dwmac = devm_kzalloc(&pdev->dev, sizeof(*dwmac), GFP_KERNEL);
325 goto err_remove_config_dt;
328 dwmac->data = (const struct meson8b_dwmac_data *)
329 of_device_get_match_data(&pdev->dev);
332 goto err_remove_config_dt;
334 dwmac->regs = devm_platform_ioremap_resource(pdev, 1);
335 if (IS_ERR(dwmac->regs)) {
336 ret = PTR_ERR(dwmac->regs);
337 goto err_remove_config_dt;
340 dwmac->dev = &pdev->dev;
341 dwmac->phy_mode = of_get_phy_mode(pdev->dev.of_node);
342 if (dwmac->phy_mode < 0) {
343 dev_err(&pdev->dev, "missing phy-mode property\n");
345 goto err_remove_config_dt;
348 /* use 2ns as fallback since this value was previously hardcoded */
349 if (of_property_read_u32(pdev->dev.of_node, "amlogic,tx-delay-ns",
350 &dwmac->tx_delay_ns))
351 dwmac->tx_delay_ns = 2;
353 ret = meson8b_init_rgmii_tx_clk(dwmac);
355 goto err_remove_config_dt;
357 ret = dwmac->data->set_phy_mode(dwmac);
359 goto err_remove_config_dt;
361 ret = meson8b_init_prg_eth(dwmac);
363 goto err_remove_config_dt;
365 plat_dat->bsp_priv = dwmac;
367 ret = stmmac_dvr_probe(&pdev->dev, plat_dat, &stmmac_res);
369 goto err_remove_config_dt;
373 err_remove_config_dt:
374 stmmac_remove_config_dt(pdev, plat_dat);
379 static const struct meson8b_dwmac_data meson8b_dwmac_data = {
380 .set_phy_mode = meson8b_set_phy_mode,
383 static const struct meson8b_dwmac_data meson_axg_dwmac_data = {
384 .set_phy_mode = meson_axg_set_phy_mode,
387 static const struct of_device_id meson8b_dwmac_match[] = {
389 .compatible = "amlogic,meson8b-dwmac",
390 .data = &meson8b_dwmac_data,
393 .compatible = "amlogic,meson8m2-dwmac",
394 .data = &meson8b_dwmac_data,
397 .compatible = "amlogic,meson-gxbb-dwmac",
398 .data = &meson8b_dwmac_data,
401 .compatible = "amlogic,meson-axg-dwmac",
402 .data = &meson_axg_dwmac_data,
406 MODULE_DEVICE_TABLE(of, meson8b_dwmac_match);
408 static struct platform_driver meson8b_dwmac_driver = {
409 .probe = meson8b_dwmac_probe,
410 .remove = stmmac_pltfr_remove,
412 .name = "meson8b-dwmac",
413 .pm = &stmmac_pltfr_pm_ops,
414 .of_match_table = meson8b_dwmac_match,
417 module_platform_driver(meson8b_dwmac_driver);
419 MODULE_AUTHOR("Martin Blumenstingl <martin.blumenstingl@googlemail.com>");
420 MODULE_DESCRIPTION("Amlogic Meson8b, Meson8m2 and GXBB DWMAC glue layer");
421 MODULE_LICENSE("GPL v2");