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)
37 #define PRG_ETH0_TXDLY_OFF (0x0 << PRG_ETH0_TXDLY_SHIFT)
38 #define PRG_ETH0_TXDLY_QUARTER (0x1 << PRG_ETH0_TXDLY_SHIFT)
39 #define PRG_ETH0_TXDLY_HALF (0x2 << PRG_ETH0_TXDLY_SHIFT)
40 #define PRG_ETH0_TXDLY_THREE_QUARTERS (0x3 << PRG_ETH0_TXDLY_SHIFT)
42 /* divider for the result of m250_sel */
43 #define PRG_ETH0_CLK_M250_DIV_SHIFT 7
44 #define PRG_ETH0_CLK_M250_DIV_WIDTH 3
46 /* divides the result of m25_sel by either 5 (bit unset) or 10 (bit set) */
47 #define PRG_ETH0_CLK_M25_DIV_SHIFT 10
48 #define PRG_ETH0_CLK_M25_DIV_WIDTH 1
50 #define PRG_ETH0_INVERTED_RMII_CLK BIT(11)
51 #define PRG_ETH0_TX_AND_PHY_REF_CLK BIT(12)
53 #define MUX_CLK_NUM_PARENTS 2
55 struct meson8b_dwmac {
56 struct platform_device *pdev;
60 phy_interface_t phy_mode;
62 struct clk_mux m250_mux;
63 struct clk *m250_mux_clk;
64 struct clk *m250_mux_parent[MUX_CLK_NUM_PARENTS];
66 struct clk_divider m250_div;
67 struct clk *m250_div_clk;
69 struct clk_divider m25_div;
70 struct clk *m25_div_clk;
73 static void meson8b_dwmac_mask_bits(struct meson8b_dwmac *dwmac, u32 reg,
78 data = readl(dwmac->regs + reg);
80 data |= (value & mask);
82 writel(data, dwmac->regs + reg);
85 static int meson8b_init_clk(struct meson8b_dwmac *dwmac)
87 struct clk_init_data init;
89 struct device *dev = &dwmac->pdev->dev;
91 const char *clk_div_parents[1];
92 const char *mux_parent_names[MUX_CLK_NUM_PARENTS];
93 static struct clk_div_table clk_25m_div_table[] = {
94 { .val = 0, .div = 5 },
95 { .val = 1, .div = 10 },
99 /* get the mux parents from DT */
100 for (i = 0; i < MUX_CLK_NUM_PARENTS; i++) {
103 snprintf(name, sizeof(name), "clkin%d", i);
104 dwmac->m250_mux_parent[i] = devm_clk_get(dev, name);
105 if (IS_ERR(dwmac->m250_mux_parent[i])) {
106 ret = PTR_ERR(dwmac->m250_mux_parent[i]);
107 if (ret != -EPROBE_DEFER)
108 dev_err(dev, "Missing clock %s\n", name);
112 mux_parent_names[i] =
113 __clk_get_name(dwmac->m250_mux_parent[i]);
116 /* create the m250_mux */
117 snprintf(clk_name, sizeof(clk_name), "%s#m250_sel", dev_name(dev));
118 init.name = clk_name;
119 init.ops = &clk_mux_ops;
120 init.flags = CLK_SET_RATE_PARENT;
121 init.parent_names = mux_parent_names;
122 init.num_parents = MUX_CLK_NUM_PARENTS;
124 dwmac->m250_mux.reg = dwmac->regs + PRG_ETH0;
125 dwmac->m250_mux.shift = __ffs(PRG_ETH0_CLK_M250_SEL_MASK);
126 dwmac->m250_mux.mask = PRG_ETH0_CLK_M250_SEL_MASK >>
127 dwmac->m250_mux.shift;
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 |
150 CLK_DIVIDER_ALLOW_ZERO |
151 CLK_DIVIDER_ROUND_CLOSEST;
153 dwmac->m250_div_clk = devm_clk_register(dev, &dwmac->m250_div.hw);
154 if (WARN_ON(IS_ERR(dwmac->m250_div_clk)))
155 return PTR_ERR(dwmac->m250_div_clk);
157 /* create the m25_div */
158 snprintf(clk_name, sizeof(clk_name), "%s#m25_div", dev_name(dev));
159 init.name = devm_kstrdup(dev, clk_name, GFP_KERNEL);
160 init.ops = &clk_divider_ops;
161 init.flags = CLK_IS_BASIC | CLK_SET_RATE_PARENT;
162 clk_div_parents[0] = __clk_get_name(dwmac->m250_div_clk);
163 init.parent_names = clk_div_parents;
164 init.num_parents = ARRAY_SIZE(clk_div_parents);
166 dwmac->m25_div.reg = dwmac->regs + PRG_ETH0;
167 dwmac->m25_div.shift = PRG_ETH0_CLK_M25_DIV_SHIFT;
168 dwmac->m25_div.width = PRG_ETH0_CLK_M25_DIV_WIDTH;
169 dwmac->m25_div.table = clk_25m_div_table;
170 dwmac->m25_div.hw.init = &init;
171 dwmac->m25_div.flags = CLK_DIVIDER_ALLOW_ZERO;
173 dwmac->m25_div_clk = devm_clk_register(dev, &dwmac->m25_div.hw);
174 if (WARN_ON(IS_ERR(dwmac->m25_div_clk)))
175 return PTR_ERR(dwmac->m25_div_clk);
180 static int meson8b_init_prg_eth(struct meson8b_dwmac *dwmac)
183 unsigned long clk_rate;
185 switch (dwmac->phy_mode) {
186 case PHY_INTERFACE_MODE_RGMII:
187 case PHY_INTERFACE_MODE_RGMII_ID:
188 case PHY_INTERFACE_MODE_RGMII_RXID:
189 case PHY_INTERFACE_MODE_RGMII_TXID:
190 /* Generate a 25MHz clock for the PHY */
191 clk_rate = 25 * 1000 * 1000;
193 /* enable RGMII mode */
194 meson8b_dwmac_mask_bits(dwmac, PRG_ETH0, PRG_ETH0_RGMII_MODE,
195 PRG_ETH0_RGMII_MODE);
197 /* only relevant for RMII mode -> disable in RGMII mode */
198 meson8b_dwmac_mask_bits(dwmac, PRG_ETH0,
199 PRG_ETH0_INVERTED_RMII_CLK, 0);
201 /* TX clock delay - all known boards use a 1/4 cycle delay */
202 meson8b_dwmac_mask_bits(dwmac, PRG_ETH0, PRG_ETH0_TXDLY_MASK,
203 PRG_ETH0_TXDLY_QUARTER);
206 case PHY_INTERFACE_MODE_RMII:
207 /* Use the rate of the mux clock for the internal RMII PHY */
208 clk_rate = clk_get_rate(dwmac->m250_mux_clk);
210 /* disable RGMII mode -> enables RMII mode */
211 meson8b_dwmac_mask_bits(dwmac, PRG_ETH0, PRG_ETH0_RGMII_MODE,
214 /* invert internal clk_rmii_i to generate 25/2.5 tx_rx_clk */
215 meson8b_dwmac_mask_bits(dwmac, PRG_ETH0,
216 PRG_ETH0_INVERTED_RMII_CLK,
217 PRG_ETH0_INVERTED_RMII_CLK);
219 /* TX clock delay cannot be configured in RMII mode */
220 meson8b_dwmac_mask_bits(dwmac, PRG_ETH0, PRG_ETH0_TXDLY_MASK,
226 dev_err(&dwmac->pdev->dev, "unsupported phy-mode %s\n",
227 phy_modes(dwmac->phy_mode));
231 ret = clk_prepare_enable(dwmac->m25_div_clk);
233 dev_err(&dwmac->pdev->dev, "failed to enable the PHY clock\n");
237 ret = clk_set_rate(dwmac->m25_div_clk, clk_rate);
239 clk_disable_unprepare(dwmac->m25_div_clk);
241 dev_err(&dwmac->pdev->dev, "failed to set PHY clock\n");
245 /* enable TX_CLK and PHY_REF_CLK generator */
246 meson8b_dwmac_mask_bits(dwmac, PRG_ETH0, PRG_ETH0_TX_AND_PHY_REF_CLK,
247 PRG_ETH0_TX_AND_PHY_REF_CLK);
252 static int meson8b_dwmac_probe(struct platform_device *pdev)
254 struct plat_stmmacenet_data *plat_dat;
255 struct stmmac_resources stmmac_res;
256 struct resource *res;
257 struct meson8b_dwmac *dwmac;
260 ret = stmmac_get_platform_resources(pdev, &stmmac_res);
264 plat_dat = stmmac_probe_config_dt(pdev, &stmmac_res.mac);
265 if (IS_ERR(plat_dat))
266 return PTR_ERR(plat_dat);
268 dwmac = devm_kzalloc(&pdev->dev, sizeof(*dwmac), GFP_KERNEL);
271 goto err_remove_config_dt;
274 res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
275 dwmac->regs = devm_ioremap_resource(&pdev->dev, res);
276 if (IS_ERR(dwmac->regs)) {
277 ret = PTR_ERR(dwmac->regs);
278 goto err_remove_config_dt;
282 dwmac->phy_mode = of_get_phy_mode(pdev->dev.of_node);
283 if ((int)dwmac->phy_mode < 0) {
284 dev_err(&pdev->dev, "missing phy-mode property\n");
286 goto err_remove_config_dt;
289 ret = meson8b_init_clk(dwmac);
291 goto err_remove_config_dt;
293 ret = meson8b_init_prg_eth(dwmac);
295 goto err_remove_config_dt;
297 plat_dat->bsp_priv = dwmac;
299 ret = stmmac_dvr_probe(&pdev->dev, plat_dat, &stmmac_res);
301 goto err_clk_disable;
306 clk_disable_unprepare(dwmac->m25_div_clk);
307 err_remove_config_dt:
308 stmmac_remove_config_dt(pdev, plat_dat);
313 static int meson8b_dwmac_remove(struct platform_device *pdev)
315 struct meson8b_dwmac *dwmac = get_stmmac_bsp_priv(&pdev->dev);
317 clk_disable_unprepare(dwmac->m25_div_clk);
319 return stmmac_pltfr_remove(pdev);
322 static const struct of_device_id meson8b_dwmac_match[] = {
323 { .compatible = "amlogic,meson8b-dwmac" },
324 { .compatible = "amlogic,meson-gxbb-dwmac" },
327 MODULE_DEVICE_TABLE(of, meson8b_dwmac_match);
329 static struct platform_driver meson8b_dwmac_driver = {
330 .probe = meson8b_dwmac_probe,
331 .remove = meson8b_dwmac_remove,
333 .name = "meson8b-dwmac",
334 .pm = &stmmac_pltfr_pm_ops,
335 .of_match_table = meson8b_dwmac_match,
338 module_platform_driver(meson8b_dwmac_driver);
340 MODULE_AUTHOR("Martin Blumenstingl <martin.blumenstingl@googlemail.com>");
341 MODULE_DESCRIPTION("Amlogic Meson8b and GXBB DWMAC glue layer");
342 MODULE_LICENSE("GPL v2");