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>
14 #include <dt-bindings/phy/phy.h>
15 #include <generic-phy.h>
17 #include <asm/arch/sys_proto.h>
18 #include <power-domain.h>
21 #include <linux/err.h>
24 #define CMU_MASTER_CDN_O BIT(24)
26 #define COMLANE_R138 0xb38
27 #define CONFIG_VERSION_REG_MASK GENMASK(23, 16)
28 #define CONFIG_VERSION_REG_SHIFT 16
31 #define COMLANE_R190 0xb90
32 #define L1_MASTER_CDN_O BIT(9)
34 #define COMLANE_R194 0xb94
35 #define CMU_OK_I_0 BIT(19)
37 #define SERDES_CTRL 0x1fd0
38 #define POR_EN BIT(29)
40 #define WIZ_LANEXCTL_STS 0x1fe0
41 #define TX0_ENABLE_OVL BIT(31)
42 #define TX0_ENABLE_MASK GENMASK(30, 29)
43 #define TX0_ENABLE_SHIFT 29
44 #define TX0_DISABLE_STATE 0x0
45 #define TX0_SLEEP_STATE 0x1
46 #define TX0_SNOOZE_STATE 0x2
47 #define TX0_ENABLE_STATE 0x3
48 #define RX0_ENABLE_OVL BIT(15)
49 #define RX0_ENABLE_MASK GENMASK(14, 13)
50 #define RX0_ENABLE_SHIFT 13
51 #define RX0_DISABLE_STATE 0x0
52 #define RX0_SLEEP_STATE 0x1
53 #define RX0_SNOOZE_STATE 0x2
54 #define RX0_ENABLE_STATE 0x3
56 #define WIZ_PLL_CTRL 0x1ff4
57 #define PLL_ENABLE_OVL BIT(31)
58 #define PLL_ENABLE_MASK GENMASK(30, 29)
59 #define PLL_ENABLE_SHIFT 29
60 #define PLL_DISABLE_STATE 0x0
61 #define PLL_SLEEP_STATE 0x1
62 #define PLL_SNOOZE_STATE 0x2
63 #define PLL_ENABLE_STATE 0x3
64 #define PLL_OK BIT(28)
66 #define PLL_LOCK_TIME 1000 /* in milliseconds */
67 #define SLEEP_TIME 100 /* in microseconds */
70 #define LANE_PCIE0_LANE0 0x1
72 #define LANE_PCIE1_LANE0 0x0
73 #define LANE_PCIE0_LANE1 0x1
75 #define SERDES_NUM_CLOCKS 3
77 /* SERDES control MMR bit offsets */
78 #define SERDES_CTL_LANE_FUNC_SEL_SHIFT 0
79 #define SERDES_CTL_LANE_FUNC_SEL_MASK GENMASK(1, 0)
80 #define SERDES_CTL_CLK_SEL_SHIFT 4
81 #define SERDES_CTL_CLK_SEL_MASK GENMASK(7, 4)
84 * struct serdes_am654_mux_clk_data - clock controller information structure
86 struct serdes_am654_mux_clk_data {
87 struct regmap *regmap;
88 struct clk_bulk parents;
91 static int serdes_am654_mux_clk_probe(struct udevice *dev)
93 struct serdes_am654_mux_clk_data *data = dev_get_priv(dev);
94 struct udevice *syscon;
95 struct regmap *regmap;
98 debug("%s(dev=%s)\n", __func__, dev->name);
103 ret = uclass_get_device_by_phandle(UCLASS_SYSCON, dev,
104 "ti,serdes-clk", &syscon);
106 dev_err(dev, "unable to find syscon device\n");
110 regmap = syscon_get_regmap(syscon);
111 if (IS_ERR(regmap)) {
112 dev_err(dev, "Fail to get Syscon regmap\n");
113 return PTR_ERR(regmap);
116 data->regmap = regmap;
118 ret = clk_get_bulk(dev, &data->parents);
120 dev_err(dev, "Failed to obtain parent clocks\n");
127 static int mux_table[SERDES_NUM_CLOCKS][3] = {
129 * The entries represent values for selecting between
130 * {left input, external reference clock, right input}
131 * Only one of Left Output or Right Output should be used since
132 * both left and right output clock uses the same bits and modifying
133 * one clock will impact the other.
135 { BIT(2), 0, BIT(0) }, /* Mux of CMU refclk */
136 { -1, BIT(3), BIT(1) }, /* Mux of Left Output */
137 { BIT(1), BIT(3) | BIT(1), -1 }, /* Mux of Right Output */
140 static int serdes_am654_mux_clk_set_parent(struct clk *clk, struct clk *parent)
142 struct serdes_am654_mux_clk_data *data = dev_get_priv(clk->dev);
146 debug("%s(clk=%s, parent=%s)\n", __func__, clk->dev->name,
150 * Since we have the same device-tree node represent both the
151 * clock and serdes device, we have two devices associated with
152 * the serdes node. assigned-clocks for this node is processed twice,
153 * once for the clock device and another time for the serdes
154 * device. When it is processed for the clock device, it is before
155 * the probe for clock device has been called. We ignore this case
156 * and rely on assigned-clocks to be processed correctly for the
162 for (i = 0; i < data->parents.count; i++) {
163 if (clk_is_match(&data->parents.clks[i], parent))
167 if (i >= data->parents.count)
170 val = mux_table[clk->id][i];
171 val <<= SERDES_CTL_CLK_SEL_SHIFT;
173 regmap_update_bits(data->regmap, 0, SERDES_CTL_CLK_SEL_MASK, val);
178 static struct clk_ops serdes_am654_mux_clk_ops = {
179 .set_parent = serdes_am654_mux_clk_set_parent,
182 U_BOOT_DRIVER(serdes_am654_mux_clk) = {
183 .name = "ti-serdes-am654-mux-clk",
185 .probe = serdes_am654_mux_clk_probe,
186 .priv_auto_alloc_size = sizeof(struct serdes_am654_mux_clk_data),
187 .ops = &serdes_am654_mux_clk_ops,
190 struct serdes_am654 {
191 struct regmap *regmap;
192 struct regmap *serdes_ctl;
195 static int serdes_am654_enable_pll(struct serdes_am654 *phy)
197 u32 mask = PLL_ENABLE_OVL | PLL_ENABLE_MASK;
198 u32 val = PLL_ENABLE_OVL | (PLL_ENABLE_STATE << PLL_ENABLE_SHIFT);
200 regmap_update_bits(phy->regmap, WIZ_PLL_CTRL, mask, val);
202 return regmap_read_poll_timeout(phy->regmap, WIZ_PLL_CTRL, val,
203 val & PLL_OK, 1000, PLL_LOCK_TIME);
206 static void serdes_am654_disable_pll(struct serdes_am654 *phy)
208 u32 mask = PLL_ENABLE_OVL | PLL_ENABLE_MASK;
210 regmap_update_bits(phy->regmap, WIZ_PLL_CTRL, mask, 0);
213 static int serdes_am654_enable_txrx(struct serdes_am654 *phy)
219 mask = TX0_ENABLE_OVL | TX0_ENABLE_MASK;
220 val = TX0_ENABLE_OVL | (TX0_ENABLE_STATE << TX0_ENABLE_SHIFT);
221 regmap_update_bits(phy->regmap, WIZ_LANEXCTL_STS, mask, val);
224 mask = RX0_ENABLE_OVL | RX0_ENABLE_MASK;
225 val = RX0_ENABLE_OVL | (RX0_ENABLE_STATE << RX0_ENABLE_SHIFT);
226 regmap_update_bits(phy->regmap, WIZ_LANEXCTL_STS, mask, val);
231 static int serdes_am654_disable_txrx(struct serdes_am654 *phy)
236 mask = TX0_ENABLE_OVL | TX0_ENABLE_MASK;
237 regmap_update_bits(phy->regmap, WIZ_LANEXCTL_STS, mask, 0);
240 mask = RX0_ENABLE_OVL | RX0_ENABLE_MASK;
241 regmap_update_bits(phy->regmap, WIZ_LANEXCTL_STS, mask, 0);
246 static int serdes_am654_power_on(struct phy *x)
248 struct serdes_am654 *phy = dev_get_priv(x->dev);
252 ret = serdes_am654_enable_pll(phy);
254 dev_err(x->dev, "Failed to enable PLL\n");
258 ret = serdes_am654_enable_txrx(phy);
260 dev_err(x->dev, "Failed to enable TX RX\n");
264 return regmap_read_poll_timeout(phy->regmap, COMLANE_R194, val,
265 val & CMU_OK_I_0, SLEEP_TIME,
269 static int serdes_am654_power_off(struct phy *x)
271 struct serdes_am654 *phy = dev_get_priv(x->dev);
273 serdes_am654_disable_txrx(phy);
274 serdes_am654_disable_pll(phy);
279 static int serdes_am654_init(struct phy *x)
281 struct serdes_am654 *phy = dev_get_priv(x->dev);
285 mask = CONFIG_VERSION_REG_MASK;
286 val = VERSION << CONFIG_VERSION_REG_SHIFT;
287 regmap_update_bits(phy->regmap, COMLANE_R138, mask, val);
289 val = CMU_MASTER_CDN_O;
290 regmap_update_bits(phy->regmap, CMU_R07C, val, val);
292 val = L1_MASTER_CDN_O;
293 regmap_update_bits(phy->regmap, COMLANE_R190, val, val);
298 static int serdes_am654_reset(struct phy *x)
300 struct serdes_am654 *phy = dev_get_priv(x->dev);
304 regmap_update_bits(phy->regmap, SERDES_CTRL, val, val);
306 regmap_update_bits(phy->regmap, SERDES_CTRL, val, 0);
311 static int serdes_am654_of_xlate(struct phy *x,
312 struct ofnode_phandle_args *args)
314 struct serdes_am654 *phy = dev_get_priv(x->dev);
316 if (args->args_count != 2) {
317 dev_err(phy->dev, "Invalid DT PHY argument count: %d\n",
322 if (args->args[0] != PHY_TYPE_PCIE) {
323 dev_err(phy->dev, "Unrecognized PHY type: %d\n",
328 x->id = args->args[0] | (args->args[1] << 16);
330 /* Setup mux mode using second argument */
331 regmap_update_bits(phy->serdes_ctl, 0, SERDES_CTL_LANE_FUNC_SEL_MASK,
337 static int serdes_am654_bind(struct udevice *dev)
341 ret = device_bind_driver_to_node(dev->parent,
342 "ti-serdes-am654-mux-clk",
343 dev_read_name(dev), dev->node,
346 dev_err(dev, "%s: not able to bind clock driver\n", __func__);
353 static int serdes_am654_probe(struct udevice *dev)
355 struct serdes_am654 *phy = dev_get_priv(dev);
356 struct power_domain serdes_pwrdmn;
357 struct regmap *serdes_ctl;
361 ret = regmap_init_mem(dev_ofnode(dev), &map);
367 serdes_ctl = syscon_regmap_lookup_by_phandle(dev, "ti,serdes-clk");
368 if (IS_ERR(serdes_ctl)) {
369 dev_err(dev, "unable to find syscon device\n");
370 return PTR_ERR(serdes_ctl);
373 phy->serdes_ctl = serdes_ctl;
375 ret = power_domain_get_by_index(dev, &serdes_pwrdmn, 0);
377 dev_err(dev, "failed to get power domain\n");
381 ret = power_domain_on(&serdes_pwrdmn);
383 dev_err(dev, "Power domain on failed\n");
390 static const struct udevice_id serdes_am654_phy_ids[] = {
392 .compatible = "ti,phy-am654-serdes",
396 static const struct phy_ops serdes_am654_phy_ops = {
397 .reset = serdes_am654_reset,
398 .init = serdes_am654_init,
399 .power_on = serdes_am654_power_on,
400 .power_off = serdes_am654_power_off,
401 .of_xlate = serdes_am654_of_xlate,
404 U_BOOT_DRIVER(am654_serdes_phy) = {
405 .name = "am654_serdes_phy",
407 .of_match = serdes_am654_phy_ids,
408 .bind = serdes_am654_bind,
409 .ops = &serdes_am654_phy_ops,
410 .probe = serdes_am654_probe,
411 .priv_auto_alloc_size = sizeof(struct serdes_am654),