2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
4 * Copyright (c) 2019 Michal Meloun <mmel@FreeBSD.org>
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
18 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 #include <sys/cdefs.h>
33 __FBSDID("$FreeBSD$");
35 #include <sys/param.h>
36 #include <sys/systm.h>
39 #include <sys/kernel.h>
40 #include <sys/module.h>
41 #include <sys/mutex.h>
43 #include <machine/bus.h>
45 #include <dev/fdt/fdt_common.h>
46 #include <dev/ofw/ofw_bus.h>
47 #include <dev/ofw/ofw_bus_subr.h>
48 #include <dev/ofw/ofw_subr.h>
50 #include <dev/extres/clk/clk.h>
51 #include <dev/extres/phy/phy.h>
52 #include <dev/extres/phy/phy_internal.h>
53 #include <dev/extres/syscon/syscon.h>
54 #include <dev/extres/hwreset/hwreset.h>
56 #include "syscon_if.h"
58 #define GRF_HIWORD_SHIFT 16
59 #define GRF_SOC_CON_5_PCIE 0xE214
60 #define CON_5_PCIE_IDLE_OFF(x) (1 <<(((x) & 0x3) + 3))
61 #define GRF_SOC_CON8 0xE220
62 #define GRF_SOC_STATUS1 0xE2A4
64 /* PHY config registers - write */
65 #define PHY_CFG_CLK_TEST 0x10
66 #define CLK_TEST_SEPE_RATE (1 << 3)
67 #define PHY_CFG_CLK_SCC 0x12
68 #define CLK_SCC_PLL_100M (1 << 3)
70 /* PHY config registers - read */
71 #define PHY_CFG_PLL_LOCK 0x10
72 #define CLK_PLL_LOCKED (1 << 1)
73 #define PHY_CFG_SCC_LOCK 0x12
74 #define CLK_SCC_100M_GATE (1 << 2)
76 #define STATUS1_PLL_LOCKED (1 << 9)
78 static struct ofw_compat_data compat_data[] = {
79 {"rockchip,rk3399-pcie-phy", 1},
83 struct rk_pcie_phy_softc {
85 struct syscon *syscon;
88 hwreset_t hwreset_phy;
92 #define PHY_LOCK(_sc) mtx_lock(&(_sc)->mtx)
93 #define PHY_UNLOCK(_sc) mtx_unlock(&(_sc)->mtx)
94 #define PHY_LOCK_INIT(_sc) mtx_init(&(_sc)->mtx, \
95 device_get_nameunit(_sc->dev), "rk_pcie_phyc", MTX_DEF)
96 #define PHY_LOCK_DESTROY(_sc) mtx_destroy(&(_sc)->mtx);
97 #define PHY_ASSERT_LOCKED(_sc) mtx_assert(&(_sc)->mtx, MA_OWNED);
98 #define PHY_ASSERT_UNLOCKED(_sc) mtx_assert(&(_sc)->mtx, MA_NOTOWNED);
100 #define RD4(sc, reg) SYSCON_READ_4((sc)->syscon, (reg))
101 #define WR4(sc, reg, mask, val) \
102 SYSCON_WRITE_4((sc)->syscon, (reg), ((mask) << GRF_HIWORD_SHIFT) | (val))
107 cfg_write(struct rk_pcie_phy_softc *sc, uint32_t reg, uint32_t data)
109 /* setup register address and data first */
110 WR4(sc, GRF_SOC_CON8, 0x7FF,
111 (reg & 0x3F) << 1 | (data & 0x0F) << 7);
112 /* dummy readback for sync */
113 RD4(sc, GRF_SOC_CON8);
116 WR4(sc, GRF_SOC_CON8, 1, 1);
117 RD4(sc, GRF_SOC_CON8);
119 WR4(sc, GRF_SOC_CON8, 1, 0);
120 RD4(sc, GRF_SOC_CON8);
125 cfg_read(struct rk_pcie_phy_softc *sc, uint32_t reg)
129 WR4(sc, GRF_SOC_CON8, 0x3FF, reg << 1);
130 RD4(sc, GRF_SOC_CON8);
132 val = RD4(sc, GRF_SOC_STATUS1);
133 return ((val >> 8) & 0x0f);
137 rk_pcie_phy_up(struct rk_pcie_phy_softc *sc, int id)
145 if (sc->enable_count != 1) {
150 rv = hwreset_deassert(sc->hwreset_phy);
152 device_printf(sc->dev, "Cannot deassert 'phy' reset\n");
156 /* Un-idle all lanes */
157 for (i = 0; i < MAX_LANE; i++)
158 WR4(sc, GRF_SOC_CON_5_PCIE, CON_5_PCIE_IDLE_OFF(i), 0);
160 /* Wait for PLL lock */
161 for (i = 100; i > 0; i--) {
162 val = cfg_read(sc, PHY_CFG_PLL_LOCK);
163 if (val & CLK_PLL_LOCKED)
168 device_printf(sc->dev, "PLL lock timeouted, 0x%02X\n", val);
172 /* Switch PLL to stable 5GHz, rate adjustment is done by divider */
173 cfg_write(sc, PHY_CFG_CLK_TEST, CLK_TEST_SEPE_RATE);
174 /* Enable 100MHz output for PCIe ref clock */
175 cfg_write(sc, PHY_CFG_CLK_SCC, CLK_SCC_PLL_100M);
177 /* Wait for ungating of ref clock */
178 for (i = 100; i > 0; i--) {
179 val = cfg_read(sc, PHY_CFG_SCC_LOCK);
180 if ((val & CLK_SCC_100M_GATE) == 0)
185 device_printf(sc->dev, "PLL output enable timeouted\n");
190 /* Wait for PLL relock (to 5GHz) */
191 for (i = 100; i > 0; i--) {
192 val = cfg_read(sc, PHY_CFG_PLL_LOCK);
193 if (val & CLK_PLL_LOCKED)
198 device_printf(sc->dev, "PLL relock timeouted\n");
208 rk_pcie_phy_down(struct rk_pcie_phy_softc *sc, int id)
215 if (sc->enable_count <= 0)
216 panic("unpaired enable/disable");
220 /* Idle given lane */
221 WR4(sc, GRF_SOC_CON_5_PCIE,
222 CON_5_PCIE_IDLE_OFF(id),
223 CON_5_PCIE_IDLE_OFF(id));
225 if (sc->enable_count == 0) {
226 rv = hwreset_assert(sc->hwreset_phy);
228 device_printf(sc->dev, "Cannot assert 'phy' reset\n");
235 rk_pcie_phy_enable(struct phynode *phynode, bool enable)
237 struct rk_pcie_phy_softc *sc;
242 dev = phynode_get_device(phynode);
243 phy = phynode_get_id(phynode);
244 sc = device_get_softc(dev);
247 rv = rk_pcie_phy_up(sc, (int)phy);
249 rv = rk_pcie_phy_down(sc, (int) phy);
254 /* Phy class and methods. */
255 static int rk_pcie_phy_enable(struct phynode *phynode, bool enable);
256 static phynode_method_t rk_pcie_phy_phynode_methods[] = {
257 PHYNODEMETHOD(phynode_enable, rk_pcie_phy_enable),
262 DEFINE_CLASS_1( rk_pcie_phy_phynode, rk_pcie_phy_phynode_class,
263 rk_pcie_phy_phynode_methods, 0, phynode_class);
266 rk_pcie_phy_probe(device_t dev)
269 if (!ofw_bus_status_okay(dev))
272 if (ofw_bus_search_compatible(dev, compat_data)->ocd_data == 0)
275 device_set_desc(dev, "Rockchip RK3399 PCIe PHY");
276 return (BUS_PROBE_DEFAULT);
280 rk_pcie_phy_attach(device_t dev)
282 struct rk_pcie_phy_softc *sc;
283 struct phynode_init_def phy_init;
284 struct phynode *phynode;
288 sc = device_get_softc(dev);
290 node = ofw_bus_get_node(dev);
293 if (SYSCON_GET_HANDLE(sc->dev, &sc->syscon) != 0 ||
294 sc->syscon == NULL) {
295 device_printf(dev, "cannot get syscon for device\n");
300 rv = clk_get_by_ofw_name(sc->dev, 0, "refclk", &sc->clk_ref);
302 device_printf(sc->dev, "Cannot get 'refclk' clock\n");
306 rv = hwreset_get_by_ofw_name(sc->dev, 0, "phy", &sc->hwreset_phy);
308 device_printf(sc->dev, "Cannot get 'phy' reset\n");
313 rv = hwreset_assert(sc->hwreset_phy);
315 device_printf(sc->dev, "Cannot assert 'phy' reset\n");
320 rv = clk_enable(sc->clk_ref);
322 device_printf(sc->dev, "Cannot enable 'ref' clock\n");
327 for (i = 0; i < MAX_LANE; i++) {
329 phy_init.ofw_node = node;
330 phynode = phynode_create(dev, &rk_pcie_phy_phynode_class,
332 if (phynode == NULL) {
333 device_printf(dev, "Cannot create phy[%d]\n", i);
337 if (phynode_register(phynode) == NULL) {
338 device_printf(dev, "Cannot register phy[%d]\n", i);
350 static device_method_t rk_pcie_phy_methods[] = {
351 /* Device interface */
352 DEVMETHOD(device_probe, rk_pcie_phy_probe),
353 DEVMETHOD(device_attach, rk_pcie_phy_attach),
358 DEFINE_CLASS_0(rk_pcie_phy, rk_pcie_phy_driver, rk_pcie_phy_methods,
359 sizeof(struct rk_pcie_phy_softc));
361 static devclass_t rk_pcie_phy_devclass;
362 EARLY_DRIVER_MODULE(rk_pcie_phy, simplebus, rk_pcie_phy_driver,
363 rk_pcie_phy_devclass, NULL, NULL,
364 BUS_PASS_SUPPORTDEV + BUS_PASS_ORDER_MIDDLE);