1 // SPDX-License-Identifier: GPL-2.0+
3 * PCIe SERDES driver for AM654x SoC
5 * Copyright (C) 2018 Texas Instruments
10 #include <clk-uclass.h>
13 #include <dm/device.h>
14 #include <dm/device_compat.h>
16 #include <dt-bindings/phy/phy.h>
17 #include <generic-phy.h>
19 #include <asm/arch/sys_proto.h>
20 #include <power-domain.h>
23 #include <linux/err.h>
26 #define CMU_MASTER_CDN_O BIT(24)
28 #define COMLANE_R138 0xb38
29 #define CONFIG_VERSION_REG_MASK GENMASK(23, 16)
30 #define CONFIG_VERSION_REG_SHIFT 16
33 #define COMLANE_R190 0xb90
34 #define L1_MASTER_CDN_O BIT(9)
36 #define COMLANE_R194 0xb94
37 #define CMU_OK_I_0 BIT(19)
39 #define SERDES_CTRL 0x1fd0
40 #define POR_EN BIT(29)
42 #define WIZ_LANEXCTL_STS 0x1fe0
43 #define TX0_ENABLE_OVL BIT(31)
44 #define TX0_ENABLE_MASK GENMASK(30, 29)
45 #define TX0_ENABLE_SHIFT 29
46 #define TX0_DISABLE_STATE 0x0
47 #define TX0_SLEEP_STATE 0x1
48 #define TX0_SNOOZE_STATE 0x2
49 #define TX0_ENABLE_STATE 0x3
50 #define RX0_ENABLE_OVL BIT(15)
51 #define RX0_ENABLE_MASK GENMASK(14, 13)
52 #define RX0_ENABLE_SHIFT 13
53 #define RX0_DISABLE_STATE 0x0
54 #define RX0_SLEEP_STATE 0x1
55 #define RX0_SNOOZE_STATE 0x2
56 #define RX0_ENABLE_STATE 0x3
58 #define WIZ_PLL_CTRL 0x1ff4
59 #define PLL_ENABLE_OVL BIT(31)
60 #define PLL_ENABLE_MASK GENMASK(30, 29)
61 #define PLL_ENABLE_SHIFT 29
62 #define PLL_DISABLE_STATE 0x0
63 #define PLL_SLEEP_STATE 0x1
64 #define PLL_SNOOZE_STATE 0x2
65 #define PLL_ENABLE_STATE 0x3
66 #define PLL_OK BIT(28)
68 #define PLL_LOCK_TIME 1000 /* in milliseconds */
69 #define SLEEP_TIME 100 /* in microseconds */
72 #define LANE_PCIE0_LANE0 0x1
74 #define LANE_PCIE1_LANE0 0x0
75 #define LANE_PCIE0_LANE1 0x1
77 #define SERDES_NUM_CLOCKS 3
79 /* SERDES control MMR bit offsets */
80 #define SERDES_CTL_LANE_FUNC_SEL_SHIFT 0
81 #define SERDES_CTL_LANE_FUNC_SEL_MASK GENMASK(1, 0)
82 #define SERDES_CTL_CLK_SEL_SHIFT 4
83 #define SERDES_CTL_CLK_SEL_MASK GENMASK(7, 4)
86 * struct serdes_am654_mux_clk_data - clock controller information structure
88 struct serdes_am654_mux_clk_data {
89 struct regmap *regmap;
90 struct clk_bulk parents;
93 static int serdes_am654_mux_clk_probe(struct udevice *dev)
95 struct serdes_am654_mux_clk_data *data = dev_get_priv(dev);
96 struct udevice *syscon;
97 struct regmap *regmap;
100 debug("%s(dev=%s)\n", __func__, dev->name);
105 ret = uclass_get_device_by_phandle(UCLASS_SYSCON, dev,
106 "ti,serdes-clk", &syscon);
108 dev_err(dev, "unable to find syscon device\n");
112 regmap = syscon_get_regmap(syscon);
113 if (IS_ERR(regmap)) {
114 dev_err(dev, "Fail to get Syscon regmap\n");
115 return PTR_ERR(regmap);
118 data->regmap = regmap;
120 ret = clk_get_bulk(dev, &data->parents);
122 dev_err(dev, "Failed to obtain parent clocks\n");
129 static int mux_table[SERDES_NUM_CLOCKS][3] = {
131 * The entries represent values for selecting between
132 * {left input, external reference clock, right input}
133 * Only one of Left Output or Right Output should be used since
134 * both left and right output clock uses the same bits and modifying
135 * one clock will impact the other.
137 { BIT(2), 0, BIT(0) }, /* Mux of CMU refclk */
138 { -1, BIT(3), BIT(1) }, /* Mux of Left Output */
139 { BIT(1), BIT(3) | BIT(1), -1 }, /* Mux of Right Output */
142 static int serdes_am654_mux_clk_set_parent(struct clk *clk, struct clk *parent)
144 struct serdes_am654_mux_clk_data *data = dev_get_priv(clk->dev);
148 debug("%s(clk=%s, parent=%s)\n", __func__, clk->dev->name,
152 * Since we have the same device-tree node represent both the
153 * clock and serdes device, we have two devices associated with
154 * the serdes node. assigned-clocks for this node is processed twice,
155 * once for the clock device and another time for the serdes
156 * device. When it is processed for the clock device, it is before
157 * the probe for clock device has been called. We ignore this case
158 * and rely on assigned-clocks to be processed correctly for the
164 for (i = 0; i < data->parents.count; i++) {
165 if (clk_is_match(&data->parents.clks[i], parent))
169 if (i >= data->parents.count)
172 val = mux_table[clk->id][i];
173 val <<= SERDES_CTL_CLK_SEL_SHIFT;
175 regmap_update_bits(data->regmap, 0, SERDES_CTL_CLK_SEL_MASK, val);
180 static struct clk_ops serdes_am654_mux_clk_ops = {
181 .set_parent = serdes_am654_mux_clk_set_parent,
184 U_BOOT_DRIVER(serdes_am654_mux_clk) = {
185 .name = "ti-serdes-am654-mux-clk",
187 .probe = serdes_am654_mux_clk_probe,
188 .priv_auto_alloc_size = sizeof(struct serdes_am654_mux_clk_data),
189 .ops = &serdes_am654_mux_clk_ops,
192 struct serdes_am654 {
193 struct regmap *regmap;
194 struct regmap *serdes_ctl;
197 static int serdes_am654_enable_pll(struct serdes_am654 *phy)
199 u32 mask = PLL_ENABLE_OVL | PLL_ENABLE_MASK;
200 u32 val = PLL_ENABLE_OVL | (PLL_ENABLE_STATE << PLL_ENABLE_SHIFT);
202 regmap_update_bits(phy->regmap, WIZ_PLL_CTRL, mask, val);
204 return regmap_read_poll_timeout(phy->regmap, WIZ_PLL_CTRL, val,
205 val & PLL_OK, 1000, PLL_LOCK_TIME);
208 static void serdes_am654_disable_pll(struct serdes_am654 *phy)
210 u32 mask = PLL_ENABLE_OVL | PLL_ENABLE_MASK;
212 regmap_update_bits(phy->regmap, WIZ_PLL_CTRL, mask, 0);
215 static int serdes_am654_enable_txrx(struct serdes_am654 *phy)
221 mask = TX0_ENABLE_OVL | TX0_ENABLE_MASK;
222 val = TX0_ENABLE_OVL | (TX0_ENABLE_STATE << TX0_ENABLE_SHIFT);
223 regmap_update_bits(phy->regmap, WIZ_LANEXCTL_STS, mask, val);
226 mask = RX0_ENABLE_OVL | RX0_ENABLE_MASK;
227 val = RX0_ENABLE_OVL | (RX0_ENABLE_STATE << RX0_ENABLE_SHIFT);
228 regmap_update_bits(phy->regmap, WIZ_LANEXCTL_STS, mask, val);
233 static int serdes_am654_disable_txrx(struct serdes_am654 *phy)
238 mask = TX0_ENABLE_OVL | TX0_ENABLE_MASK;
239 regmap_update_bits(phy->regmap, WIZ_LANEXCTL_STS, mask, 0);
242 mask = RX0_ENABLE_OVL | RX0_ENABLE_MASK;
243 regmap_update_bits(phy->regmap, WIZ_LANEXCTL_STS, mask, 0);
248 static int serdes_am654_power_on(struct phy *x)
250 struct serdes_am654 *phy = dev_get_priv(x->dev);
254 ret = serdes_am654_enable_pll(phy);
256 dev_err(x->dev, "Failed to enable PLL\n");
260 ret = serdes_am654_enable_txrx(phy);
262 dev_err(x->dev, "Failed to enable TX RX\n");
266 return regmap_read_poll_timeout(phy->regmap, COMLANE_R194, val,
267 val & CMU_OK_I_0, SLEEP_TIME,
271 static int serdes_am654_power_off(struct phy *x)
273 struct serdes_am654 *phy = dev_get_priv(x->dev);
275 serdes_am654_disable_txrx(phy);
276 serdes_am654_disable_pll(phy);
281 static int serdes_am654_init(struct phy *x)
283 struct serdes_am654 *phy = dev_get_priv(x->dev);
287 mask = CONFIG_VERSION_REG_MASK;
288 val = VERSION << CONFIG_VERSION_REG_SHIFT;
289 regmap_update_bits(phy->regmap, COMLANE_R138, mask, val);
291 val = CMU_MASTER_CDN_O;
292 regmap_update_bits(phy->regmap, CMU_R07C, val, val);
294 val = L1_MASTER_CDN_O;
295 regmap_update_bits(phy->regmap, COMLANE_R190, val, val);
300 static int serdes_am654_reset(struct phy *x)
302 struct serdes_am654 *phy = dev_get_priv(x->dev);
306 regmap_update_bits(phy->regmap, SERDES_CTRL, val, val);
308 regmap_update_bits(phy->regmap, SERDES_CTRL, val, 0);
313 static int serdes_am654_of_xlate(struct phy *x,
314 struct ofnode_phandle_args *args)
316 struct serdes_am654 *phy = dev_get_priv(x->dev);
318 if (args->args_count != 2) {
319 dev_err(phy->dev, "Invalid DT PHY argument count: %d\n",
324 if (args->args[0] != PHY_TYPE_PCIE) {
325 dev_err(phy->dev, "Unrecognized PHY type: %d\n",
330 x->id = args->args[0] | (args->args[1] << 16);
332 /* Setup mux mode using second argument */
333 regmap_update_bits(phy->serdes_ctl, 0, SERDES_CTL_LANE_FUNC_SEL_MASK,
339 static int serdes_am654_bind(struct udevice *dev)
343 ret = device_bind_driver_to_node(dev->parent,
344 "ti-serdes-am654-mux-clk",
345 dev_read_name(dev), dev->node,
348 dev_err(dev, "%s: not able to bind clock driver\n", __func__);
355 static int serdes_am654_probe(struct udevice *dev)
357 struct serdes_am654 *phy = dev_get_priv(dev);
358 struct power_domain serdes_pwrdmn;
359 struct regmap *serdes_ctl;
363 ret = regmap_init_mem(dev_ofnode(dev), &map);
369 serdes_ctl = syscon_regmap_lookup_by_phandle(dev, "ti,serdes-clk");
370 if (IS_ERR(serdes_ctl)) {
371 dev_err(dev, "unable to find syscon device\n");
372 return PTR_ERR(serdes_ctl);
375 phy->serdes_ctl = serdes_ctl;
377 ret = power_domain_get_by_index(dev, &serdes_pwrdmn, 0);
379 dev_err(dev, "failed to get power domain\n");
383 ret = power_domain_on(&serdes_pwrdmn);
385 dev_err(dev, "Power domain on failed\n");
392 static const struct udevice_id serdes_am654_phy_ids[] = {
394 .compatible = "ti,phy-am654-serdes",
398 static const struct phy_ops serdes_am654_phy_ops = {
399 .reset = serdes_am654_reset,
400 .init = serdes_am654_init,
401 .power_on = serdes_am654_power_on,
402 .power_off = serdes_am654_power_off,
403 .of_xlate = serdes_am654_of_xlate,
406 U_BOOT_DRIVER(am654_serdes_phy) = {
407 .name = "am654_serdes_phy",
409 .of_match = serdes_am654_phy_ids,
410 .bind = serdes_am654_bind,
411 .ops = &serdes_am654_phy_ops,
412 .probe = serdes_am654_probe,
413 .priv_auto_alloc_size = sizeof(struct serdes_am654),