1 // SPDX-License-Identifier: GPL-2.0+
6 #include <linux/bitfield.h>
8 #include <linux/delay.h>
10 #include <linux/iopoll.h>
11 #include <linux/mfd/syscon.h>
12 #include <linux/mfd/syscon/imx7-iomuxc-gpr.h>
13 #include <linux/module.h>
15 #include <linux/phy/phy.h>
16 #include <linux/platform_device.h>
17 #include <linux/regmap.h>
18 #include <linux/reset.h>
20 #include <dt-bindings/phy/phy-imx8-pcie.h>
22 #define IMX8MM_PCIE_PHY_CMN_REG061 0x184
23 #define ANA_PLL_CLK_OUT_TO_EXT_IO_EN BIT(0)
24 #define IMX8MM_PCIE_PHY_CMN_REG062 0x188
25 #define ANA_PLL_CLK_OUT_TO_EXT_IO_SEL BIT(3)
26 #define IMX8MM_PCIE_PHY_CMN_REG063 0x18C
27 #define AUX_PLL_REFCLK_SEL_SYS_PLL GENMASK(7, 6)
28 #define IMX8MM_PCIE_PHY_CMN_REG064 0x190
29 #define ANA_AUX_RX_TX_SEL_TX BIT(7)
30 #define ANA_AUX_RX_TERM_GND_EN BIT(3)
31 #define ANA_AUX_TX_TERM BIT(2)
32 #define IMX8MM_PCIE_PHY_CMN_REG065 0x194
33 #define ANA_AUX_RX_TERM (BIT(7) | BIT(4))
34 #define ANA_AUX_TX_LVL GENMASK(3, 0)
35 #define IMX8MM_PCIE_PHY_CMN_REG075 0x1D4
36 #define ANA_PLL_DONE 0x3
37 #define PCIE_PHY_TRSV_REG5 0x414
38 #define PCIE_PHY_TRSV_REG6 0x418
40 #define IMX8MM_GPR_PCIE_REF_CLK_SEL GENMASK(25, 24)
41 #define IMX8MM_GPR_PCIE_REF_CLK_PLL FIELD_PREP(IMX8MM_GPR_PCIE_REF_CLK_SEL, 0x3)
42 #define IMX8MM_GPR_PCIE_REF_CLK_EXT FIELD_PREP(IMX8MM_GPR_PCIE_REF_CLK_SEL, 0x2)
43 #define IMX8MM_GPR_PCIE_AUX_EN BIT(19)
44 #define IMX8MM_GPR_PCIE_CMN_RST BIT(18)
45 #define IMX8MM_GPR_PCIE_POWER_OFF BIT(17)
46 #define IMX8MM_GPR_PCIE_SSC_EN BIT(16)
47 #define IMX8MM_GPR_PCIE_AUX_EN_OVERRIDE BIT(9)
49 enum imx8_pcie_phy_type {
54 struct imx8_pcie_phy_drvdata {
56 enum imx8_pcie_phy_type variant;
59 struct imx8_pcie_phy {
63 struct regmap *iomuxc_gpr;
64 struct reset_control *perst;
65 struct reset_control *reset;
70 const struct imx8_pcie_phy_drvdata *drvdata;
73 static int imx8_pcie_phy_power_on(struct phy *phy)
77 struct imx8_pcie_phy *imx8_phy = phy_get_drvdata(phy);
79 pad_mode = imx8_phy->refclk_pad_mode;
80 switch (imx8_phy->drvdata->variant) {
82 reset_control_assert(imx8_phy->reset);
84 /* Tune PHY de-emphasis setting to pass PCIe compliance. */
85 if (imx8_phy->tx_deemph_gen1)
86 writel(imx8_phy->tx_deemph_gen1,
87 imx8_phy->base + PCIE_PHY_TRSV_REG5);
88 if (imx8_phy->tx_deemph_gen2)
89 writel(imx8_phy->tx_deemph_gen2,
90 imx8_phy->base + PCIE_PHY_TRSV_REG6);
92 case IMX8MP: /* Do nothing. */
96 if (pad_mode == IMX8_PCIE_REFCLK_PAD_INPUT ||
97 pad_mode == IMX8_PCIE_REFCLK_PAD_UNUSED) {
98 /* Configure the pad as input */
99 val = readl(imx8_phy->base + IMX8MM_PCIE_PHY_CMN_REG061);
100 writel(val & ~ANA_PLL_CLK_OUT_TO_EXT_IO_EN,
101 imx8_phy->base + IMX8MM_PCIE_PHY_CMN_REG061);
103 /* Configure the PHY to output the refclock via pad */
104 writel(ANA_PLL_CLK_OUT_TO_EXT_IO_EN,
105 imx8_phy->base + IMX8MM_PCIE_PHY_CMN_REG061);
108 if (pad_mode == IMX8_PCIE_REFCLK_PAD_OUTPUT ||
109 pad_mode == IMX8_PCIE_REFCLK_PAD_UNUSED) {
110 /* Source clock from SoC internal PLL */
111 writel(ANA_PLL_CLK_OUT_TO_EXT_IO_SEL,
112 imx8_phy->base + IMX8MM_PCIE_PHY_CMN_REG062);
113 writel(AUX_PLL_REFCLK_SEL_SYS_PLL,
114 imx8_phy->base + IMX8MM_PCIE_PHY_CMN_REG063);
115 val = ANA_AUX_RX_TX_SEL_TX | ANA_AUX_TX_TERM;
116 writel(val | ANA_AUX_RX_TERM_GND_EN,
117 imx8_phy->base + IMX8MM_PCIE_PHY_CMN_REG064);
118 writel(ANA_AUX_RX_TERM | ANA_AUX_TX_LVL,
119 imx8_phy->base + IMX8MM_PCIE_PHY_CMN_REG065);
122 /* Set AUX_EN_OVERRIDE 1'b0, when the CLKREQ# isn't hooked */
123 regmap_update_bits(imx8_phy->iomuxc_gpr, IOMUXC_GPR14,
124 IMX8MM_GPR_PCIE_AUX_EN_OVERRIDE,
125 imx8_phy->clkreq_unused ?
126 0 : IMX8MM_GPR_PCIE_AUX_EN_OVERRIDE);
127 regmap_update_bits(imx8_phy->iomuxc_gpr, IOMUXC_GPR14,
128 IMX8MM_GPR_PCIE_AUX_EN,
129 IMX8MM_GPR_PCIE_AUX_EN);
130 regmap_update_bits(imx8_phy->iomuxc_gpr, IOMUXC_GPR14,
131 IMX8MM_GPR_PCIE_POWER_OFF, 0);
132 regmap_update_bits(imx8_phy->iomuxc_gpr, IOMUXC_GPR14,
133 IMX8MM_GPR_PCIE_SSC_EN, 0);
135 regmap_update_bits(imx8_phy->iomuxc_gpr, IOMUXC_GPR14,
136 IMX8MM_GPR_PCIE_REF_CLK_SEL,
137 pad_mode == IMX8_PCIE_REFCLK_PAD_INPUT ?
138 IMX8MM_GPR_PCIE_REF_CLK_EXT :
139 IMX8MM_GPR_PCIE_REF_CLK_PLL);
140 usleep_range(100, 200);
142 /* Do the PHY common block reset */
143 regmap_update_bits(imx8_phy->iomuxc_gpr, IOMUXC_GPR14,
144 IMX8MM_GPR_PCIE_CMN_RST,
145 IMX8MM_GPR_PCIE_CMN_RST);
147 switch (imx8_phy->drvdata->variant) {
149 reset_control_deassert(imx8_phy->perst);
152 reset_control_deassert(imx8_phy->reset);
153 usleep_range(200, 500);
157 /* Polling to check the phy is ready or not. */
158 ret = readl_poll_timeout(imx8_phy->base + IMX8MM_PCIE_PHY_CMN_REG075,
159 val, val == ANA_PLL_DONE, 10, 20000);
163 static int imx8_pcie_phy_init(struct phy *phy)
165 struct imx8_pcie_phy *imx8_phy = phy_get_drvdata(phy);
167 return clk_prepare_enable(imx8_phy->clk);
170 static int imx8_pcie_phy_exit(struct phy *phy)
172 struct imx8_pcie_phy *imx8_phy = phy_get_drvdata(phy);
174 clk_disable_unprepare(imx8_phy->clk);
179 static const struct phy_ops imx8_pcie_phy_ops = {
180 .init = imx8_pcie_phy_init,
181 .exit = imx8_pcie_phy_exit,
182 .power_on = imx8_pcie_phy_power_on,
183 .owner = THIS_MODULE,
186 static const struct imx8_pcie_phy_drvdata imx8mm_drvdata = {
187 .gpr = "fsl,imx8mm-iomuxc-gpr",
191 static const struct imx8_pcie_phy_drvdata imx8mp_drvdata = {
192 .gpr = "fsl,imx8mp-iomuxc-gpr",
196 static const struct of_device_id imx8_pcie_phy_of_match[] = {
197 {.compatible = "fsl,imx8mm-pcie-phy", .data = &imx8mm_drvdata, },
198 {.compatible = "fsl,imx8mp-pcie-phy", .data = &imx8mp_drvdata, },
201 MODULE_DEVICE_TABLE(of, imx8_pcie_phy_of_match);
203 static int imx8_pcie_phy_probe(struct platform_device *pdev)
205 struct phy_provider *phy_provider;
206 struct device *dev = &pdev->dev;
207 struct device_node *np = dev->of_node;
208 struct imx8_pcie_phy *imx8_phy;
210 imx8_phy = devm_kzalloc(dev, sizeof(*imx8_phy), GFP_KERNEL);
214 imx8_phy->drvdata = of_device_get_match_data(dev);
216 /* get PHY refclk pad mode */
217 of_property_read_u32(np, "fsl,refclk-pad-mode",
218 &imx8_phy->refclk_pad_mode);
220 if (of_property_read_u32(np, "fsl,tx-deemph-gen1",
221 &imx8_phy->tx_deemph_gen1))
222 imx8_phy->tx_deemph_gen1 = 0;
224 if (of_property_read_u32(np, "fsl,tx-deemph-gen2",
225 &imx8_phy->tx_deemph_gen2))
226 imx8_phy->tx_deemph_gen2 = 0;
228 if (of_property_read_bool(np, "fsl,clkreq-unsupported"))
229 imx8_phy->clkreq_unused = true;
231 imx8_phy->clkreq_unused = false;
233 imx8_phy->clk = devm_clk_get(dev, "ref");
234 if (IS_ERR(imx8_phy->clk)) {
235 dev_err(dev, "failed to get imx pcie phy clock\n");
236 return PTR_ERR(imx8_phy->clk);
239 /* Grab GPR config register range */
240 imx8_phy->iomuxc_gpr =
241 syscon_regmap_lookup_by_compatible(imx8_phy->drvdata->gpr);
242 if (IS_ERR(imx8_phy->iomuxc_gpr)) {
243 dev_err(dev, "unable to find iomuxc registers\n");
244 return PTR_ERR(imx8_phy->iomuxc_gpr);
247 imx8_phy->reset = devm_reset_control_get_exclusive(dev, "pciephy");
248 if (IS_ERR(imx8_phy->reset)) {
249 dev_err(dev, "Failed to get PCIEPHY reset control\n");
250 return PTR_ERR(imx8_phy->reset);
253 if (imx8_phy->drvdata->variant == IMX8MP) {
255 devm_reset_control_get_exclusive(dev, "perst");
256 if (IS_ERR(imx8_phy->perst))
257 return dev_err_probe(dev, PTR_ERR(imx8_phy->perst),
258 "Failed to get PCIE PHY PERST control\n");
261 imx8_phy->base = devm_platform_ioremap_resource(pdev, 0);
262 if (IS_ERR(imx8_phy->base))
263 return PTR_ERR(imx8_phy->base);
265 imx8_phy->phy = devm_phy_create(dev, NULL, &imx8_pcie_phy_ops);
266 if (IS_ERR(imx8_phy->phy))
267 return PTR_ERR(imx8_phy->phy);
269 phy_set_drvdata(imx8_phy->phy, imx8_phy);
271 phy_provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate);
273 return PTR_ERR_OR_ZERO(phy_provider);
276 static struct platform_driver imx8_pcie_phy_driver = {
277 .probe = imx8_pcie_phy_probe,
279 .name = "imx8-pcie-phy",
280 .of_match_table = imx8_pcie_phy_of_match,
283 module_platform_driver(imx8_pcie_phy_driver);
285 MODULE_DESCRIPTION("FSL IMX8 PCIE PHY driver");
286 MODULE_LICENSE("GPL v2");