1 // SPDX-License-Identifier: GPL-2.0+
3 * PCIe SERDES driver for AM654x SoC
5 * Copyright (C) 2018 Texas Instruments
6 * Author: Kishon Vijay Abraham I <kishon@ti.com>
10 #include <clk-uclass.h>
12 #include <dm/device.h>
13 #include <dm/device_compat.h>
15 #include <dt-bindings/phy/phy.h>
16 #include <generic-phy.h>
18 #include <asm/arch/sys_proto.h>
19 #include <power-domain.h>
22 #include <linux/err.h>
25 #define CMU_MASTER_CDN_O BIT(24)
27 #define COMLANE_R138 0xb38
28 #define CONFIG_VERSION_REG_MASK GENMASK(23, 16)
29 #define CONFIG_VERSION_REG_SHIFT 16
32 #define COMLANE_R190 0xb90
33 #define L1_MASTER_CDN_O BIT(9)
35 #define COMLANE_R194 0xb94
36 #define CMU_OK_I_0 BIT(19)
38 #define SERDES_CTRL 0x1fd0
39 #define POR_EN BIT(29)
41 #define WIZ_LANEXCTL_STS 0x1fe0
42 #define TX0_ENABLE_OVL BIT(31)
43 #define TX0_ENABLE_MASK GENMASK(30, 29)
44 #define TX0_ENABLE_SHIFT 29
45 #define TX0_DISABLE_STATE 0x0
46 #define TX0_SLEEP_STATE 0x1
47 #define TX0_SNOOZE_STATE 0x2
48 #define TX0_ENABLE_STATE 0x3
49 #define RX0_ENABLE_OVL BIT(15)
50 #define RX0_ENABLE_MASK GENMASK(14, 13)
51 #define RX0_ENABLE_SHIFT 13
52 #define RX0_DISABLE_STATE 0x0
53 #define RX0_SLEEP_STATE 0x1
54 #define RX0_SNOOZE_STATE 0x2
55 #define RX0_ENABLE_STATE 0x3
57 #define WIZ_PLL_CTRL 0x1ff4
58 #define PLL_ENABLE_OVL BIT(31)
59 #define PLL_ENABLE_MASK GENMASK(30, 29)
60 #define PLL_ENABLE_SHIFT 29
61 #define PLL_DISABLE_STATE 0x0
62 #define PLL_SLEEP_STATE 0x1
63 #define PLL_SNOOZE_STATE 0x2
64 #define PLL_ENABLE_STATE 0x3
65 #define PLL_OK BIT(28)
67 #define PLL_LOCK_TIME 1000 /* in milliseconds */
68 #define SLEEP_TIME 100 /* in microseconds */
71 #define LANE_PCIE0_LANE0 0x1
73 #define LANE_PCIE1_LANE0 0x0
74 #define LANE_PCIE0_LANE1 0x1
76 #define SERDES_NUM_CLOCKS 3
78 /* SERDES control MMR bit offsets */
79 #define SERDES_CTL_LANE_FUNC_SEL_SHIFT 0
80 #define SERDES_CTL_LANE_FUNC_SEL_MASK GENMASK(1, 0)
81 #define SERDES_CTL_CLK_SEL_SHIFT 4
82 #define SERDES_CTL_CLK_SEL_MASK GENMASK(7, 4)
85 * struct serdes_am654_mux_clk_data - clock controller information structure
87 struct serdes_am654_mux_clk_data {
88 struct regmap *regmap;
89 struct clk_bulk parents;
92 static int serdes_am654_mux_clk_probe(struct udevice *dev)
94 struct serdes_am654_mux_clk_data *data = dev_get_priv(dev);
95 struct udevice *syscon;
96 struct regmap *regmap;
99 debug("%s(dev=%s)\n", __func__, dev->name);
104 ret = uclass_get_device_by_phandle(UCLASS_SYSCON, dev,
105 "ti,serdes-clk", &syscon);
107 dev_err(dev, "unable to find syscon device\n");
111 regmap = syscon_get_regmap(syscon);
112 if (IS_ERR(regmap)) {
113 dev_err(dev, "Fail to get Syscon regmap\n");
114 return PTR_ERR(regmap);
117 data->regmap = regmap;
119 ret = clk_get_bulk(dev, &data->parents);
121 dev_err(dev, "Failed to obtain parent clocks\n");
128 static int mux_table[SERDES_NUM_CLOCKS][3] = {
130 * The entries represent values for selecting between
131 * {left input, external reference clock, right input}
132 * Only one of Left Output or Right Output should be used since
133 * both left and right output clock uses the same bits and modifying
134 * one clock will impact the other.
136 { BIT(2), 0, BIT(0) }, /* Mux of CMU refclk */
137 { -1, BIT(3), BIT(1) }, /* Mux of Left Output */
138 { BIT(1), BIT(3) | BIT(1), -1 }, /* Mux of Right Output */
141 static int serdes_am654_mux_clk_set_parent(struct clk *clk, struct clk *parent)
143 struct serdes_am654_mux_clk_data *data = dev_get_priv(clk->dev);
147 debug("%s(clk=%s, parent=%s)\n", __func__, clk->dev->name,
151 * Since we have the same device-tree node represent both the
152 * clock and serdes device, we have two devices associated with
153 * the serdes node. assigned-clocks for this node is processed twice,
154 * once for the clock device and another time for the serdes
155 * device. When it is processed for the clock device, it is before
156 * the probe for clock device has been called. We ignore this case
157 * and rely on assigned-clocks to be processed correctly for the
163 for (i = 0; i < data->parents.count; i++) {
164 if (clk_is_match(&data->parents.clks[i], parent))
168 if (i >= data->parents.count)
171 val = mux_table[clk->id][i];
172 val <<= SERDES_CTL_CLK_SEL_SHIFT;
174 regmap_update_bits(data->regmap, 0, SERDES_CTL_CLK_SEL_MASK, val);
179 static struct clk_ops serdes_am654_mux_clk_ops = {
180 .set_parent = serdes_am654_mux_clk_set_parent,
183 U_BOOT_DRIVER(serdes_am654_mux_clk) = {
184 .name = "ti-serdes-am654-mux-clk",
186 .probe = serdes_am654_mux_clk_probe,
187 .priv_auto_alloc_size = sizeof(struct serdes_am654_mux_clk_data),
188 .ops = &serdes_am654_mux_clk_ops,
191 struct serdes_am654 {
192 struct regmap *regmap;
193 struct regmap *serdes_ctl;
196 static int serdes_am654_enable_pll(struct serdes_am654 *phy)
198 u32 mask = PLL_ENABLE_OVL | PLL_ENABLE_MASK;
199 u32 val = PLL_ENABLE_OVL | (PLL_ENABLE_STATE << PLL_ENABLE_SHIFT);
201 regmap_update_bits(phy->regmap, WIZ_PLL_CTRL, mask, val);
203 return regmap_read_poll_timeout(phy->regmap, WIZ_PLL_CTRL, val,
204 val & PLL_OK, 1000, PLL_LOCK_TIME);
207 static void serdes_am654_disable_pll(struct serdes_am654 *phy)
209 u32 mask = PLL_ENABLE_OVL | PLL_ENABLE_MASK;
211 regmap_update_bits(phy->regmap, WIZ_PLL_CTRL, mask, 0);
214 static int serdes_am654_enable_txrx(struct serdes_am654 *phy)
220 mask = TX0_ENABLE_OVL | TX0_ENABLE_MASK;
221 val = TX0_ENABLE_OVL | (TX0_ENABLE_STATE << TX0_ENABLE_SHIFT);
222 regmap_update_bits(phy->regmap, WIZ_LANEXCTL_STS, mask, val);
225 mask = RX0_ENABLE_OVL | RX0_ENABLE_MASK;
226 val = RX0_ENABLE_OVL | (RX0_ENABLE_STATE << RX0_ENABLE_SHIFT);
227 regmap_update_bits(phy->regmap, WIZ_LANEXCTL_STS, mask, val);
232 static int serdes_am654_disable_txrx(struct serdes_am654 *phy)
237 mask = TX0_ENABLE_OVL | TX0_ENABLE_MASK;
238 regmap_update_bits(phy->regmap, WIZ_LANEXCTL_STS, mask, 0);
241 mask = RX0_ENABLE_OVL | RX0_ENABLE_MASK;
242 regmap_update_bits(phy->regmap, WIZ_LANEXCTL_STS, mask, 0);
247 static int serdes_am654_power_on(struct phy *x)
249 struct serdes_am654 *phy = dev_get_priv(x->dev);
253 ret = serdes_am654_enable_pll(phy);
255 dev_err(x->dev, "Failed to enable PLL\n");
259 ret = serdes_am654_enable_txrx(phy);
261 dev_err(x->dev, "Failed to enable TX RX\n");
265 return regmap_read_poll_timeout(phy->regmap, COMLANE_R194, val,
266 val & CMU_OK_I_0, SLEEP_TIME,
270 static int serdes_am654_power_off(struct phy *x)
272 struct serdes_am654 *phy = dev_get_priv(x->dev);
274 serdes_am654_disable_txrx(phy);
275 serdes_am654_disable_pll(phy);
280 static int serdes_am654_init(struct phy *x)
282 struct serdes_am654 *phy = dev_get_priv(x->dev);
286 mask = CONFIG_VERSION_REG_MASK;
287 val = VERSION << CONFIG_VERSION_REG_SHIFT;
288 regmap_update_bits(phy->regmap, COMLANE_R138, mask, val);
290 val = CMU_MASTER_CDN_O;
291 regmap_update_bits(phy->regmap, CMU_R07C, val, val);
293 val = L1_MASTER_CDN_O;
294 regmap_update_bits(phy->regmap, COMLANE_R190, val, val);
299 static int serdes_am654_reset(struct phy *x)
301 struct serdes_am654 *phy = dev_get_priv(x->dev);
305 regmap_update_bits(phy->regmap, SERDES_CTRL, val, val);
307 regmap_update_bits(phy->regmap, SERDES_CTRL, val, 0);
312 static int serdes_am654_of_xlate(struct phy *x,
313 struct ofnode_phandle_args *args)
315 struct serdes_am654 *phy = dev_get_priv(x->dev);
317 if (args->args_count != 2) {
318 dev_err(phy->dev, "Invalid DT PHY argument count: %d\n",
323 if (args->args[0] != PHY_TYPE_PCIE) {
324 dev_err(phy->dev, "Unrecognized PHY type: %d\n",
329 x->id = args->args[0] | (args->args[1] << 16);
331 /* Setup mux mode using second argument */
332 regmap_update_bits(phy->serdes_ctl, 0, SERDES_CTL_LANE_FUNC_SEL_MASK,
338 static int serdes_am654_bind(struct udevice *dev)
342 ret = device_bind_driver_to_node(dev->parent,
343 "ti-serdes-am654-mux-clk",
344 dev_read_name(dev), dev->node,
347 dev_err(dev, "%s: not able to bind clock driver\n", __func__);
354 static int serdes_am654_probe(struct udevice *dev)
356 struct serdes_am654 *phy = dev_get_priv(dev);
357 struct power_domain serdes_pwrdmn;
358 struct regmap *serdes_ctl;
362 ret = regmap_init_mem(dev_ofnode(dev), &map);
368 serdes_ctl = syscon_regmap_lookup_by_phandle(dev, "ti,serdes-clk");
369 if (IS_ERR(serdes_ctl)) {
370 dev_err(dev, "unable to find syscon device\n");
371 return PTR_ERR(serdes_ctl);
374 phy->serdes_ctl = serdes_ctl;
376 ret = power_domain_get_by_index(dev, &serdes_pwrdmn, 0);
378 dev_err(dev, "failed to get power domain\n");
382 ret = power_domain_on(&serdes_pwrdmn);
384 dev_err(dev, "Power domain on failed\n");
391 static const struct udevice_id serdes_am654_phy_ids[] = {
393 .compatible = "ti,phy-am654-serdes",
397 static const struct phy_ops serdes_am654_phy_ops = {
398 .reset = serdes_am654_reset,
399 .init = serdes_am654_init,
400 .power_on = serdes_am654_power_on,
401 .power_off = serdes_am654_power_off,
402 .of_xlate = serdes_am654_of_xlate,
405 U_BOOT_DRIVER(am654_serdes_phy) = {
406 .name = "am654_serdes_phy",
408 .of_match = serdes_am654_phy_ids,
409 .bind = serdes_am654_bind,
410 .ops = &serdes_am654_phy_ops,
411 .probe = serdes_am654_probe,
412 .priv_auto_alloc_size = sizeof(struct serdes_am654),