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// SPDX-License-Identifier: (GPL-2.0 OR MIT)
/*
* SerDes PHY driver for Microsemi Ocelot
*
* Copyright (c) 2018 Microsemi
*
*/
#include <linux/err.h>
#include <linux/mfd/syscon.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_platform.h>
#include <linux/phy.h>
#include <linux/phy/phy.h>
#include <linux/platform_device.h>
#include <linux/regmap.h>
#include <soc/mscc/ocelot_hsio.h>
#include <dt-bindings/phy/phy-ocelot-serdes.h>
struct serdes_ctrl {
struct regmap *regs;
struct device *dev;
struct phy *phys[SERDES_MAX];
};
struct serdes_macro {
u8 idx;
/* Not used when in QSGMII or PCIe mode */
int port;
struct serdes_ctrl *ctrl;
};
#define MCB_S1G_CFG_TIMEOUT 50
static int __serdes_write_mcb_s1g(struct regmap *regmap, u8 macro, u32 op)
{
unsigned int regval;
regmap_write(regmap, HSIO_MCB_S1G_ADDR_CFG, op |
HSIO_MCB_S1G_ADDR_CFG_SERDES1G_ADDR(BIT(macro)));
return regmap_read_poll_timeout(regmap, HSIO_MCB_S1G_ADDR_CFG, regval,
(regval & op) != op, 100,
MCB_S1G_CFG_TIMEOUT * 1000);
}
static int serdes_commit_mcb_s1g(struct regmap *regmap, u8 macro)
{
return __serdes_write_mcb_s1g(regmap, macro,
HSIO_MCB_S1G_ADDR_CFG_SERDES1G_WR_ONE_SHOT);
}
static int serdes_update_mcb_s1g(struct regmap *regmap, u8 macro)
{
return __serdes_write_mcb_s1g(regmap, macro,
HSIO_MCB_S1G_ADDR_CFG_SERDES1G_RD_ONE_SHOT);
}
static int serdes_init_s1g(struct regmap *regmap, u8 serdes)
{
int ret;
ret = serdes_update_mcb_s1g(regmap, serdes);
if (ret)
return ret;
regmap_update_bits(regmap, HSIO_S1G_COMMON_CFG,
HSIO_S1G_COMMON_CFG_SYS_RST |
HSIO_S1G_COMMON_CFG_ENA_LANE |
HSIO_S1G_COMMON_CFG_ENA_ELOOP |
HSIO_S1G_COMMON_CFG_ENA_FLOOP,
HSIO_S1G_COMMON_CFG_ENA_LANE);
regmap_update_bits(regmap, HSIO_S1G_PLL_CFG,
HSIO_S1G_PLL_CFG_PLL_FSM_ENA |
HSIO_S1G_PLL_CFG_PLL_FSM_CTRL_DATA_M,
HSIO_S1G_PLL_CFG_PLL_FSM_CTRL_DATA(200) |
HSIO_S1G_PLL_CFG_PLL_FSM_ENA);
regmap_update_bits(regmap, HSIO_S1G_MISC_CFG,
HSIO_S1G_MISC_CFG_DES_100FX_CPMD_ENA |
HSIO_S1G_MISC_CFG_LANE_RST,
HSIO_S1G_MISC_CFG_LANE_RST);
ret = serdes_commit_mcb_s1g(regmap, serdes);
if (ret)
return ret;
regmap_update_bits(regmap, HSIO_S1G_COMMON_CFG,
HSIO_S1G_COMMON_CFG_SYS_RST,
HSIO_S1G_COMMON_CFG_SYS_RST);
regmap_update_bits(regmap, HSIO_S1G_MISC_CFG,
HSIO_S1G_MISC_CFG_LANE_RST, 0);
ret = serdes_commit_mcb_s1g(regmap, serdes);
if (ret)
return ret;
return 0;
}
struct serdes_mux {
u8 idx;
u8 port;
enum phy_mode mode;
int submode;
u32 mask;
u32 mux;
};
#define SERDES_MUX(_idx, _port, _mode, _submode, _mask, _mux) { \
.idx = _idx, \
.port = _port, \
.mode = _mode, \
.submode = _submode, \
.mask = _mask, \
.mux = _mux, \
}
#define SERDES_MUX_SGMII(i, p, m, c) \
SERDES_MUX(i, p, PHY_MODE_ETHERNET, PHY_INTERFACE_MODE_SGMII, m, c)
#define SERDES_MUX_QSGMII(i, p, m, c) \
SERDES_MUX(i, p, PHY_MODE_ETHERNET, PHY_INTERFACE_MODE_QSGMII, m, c)
static const struct serdes_mux ocelot_serdes_muxes[] = {
SERDES_MUX_SGMII(SERDES1G(0), 0, 0, 0),
SERDES_MUX_SGMII(SERDES1G(1), 1, HSIO_HW_CFG_DEV1G_5_MODE, 0),
SERDES_MUX_SGMII(SERDES1G(1), 5, HSIO_HW_CFG_QSGMII_ENA |
HSIO_HW_CFG_DEV1G_5_MODE, HSIO_HW_CFG_DEV1G_5_MODE),
SERDES_MUX_SGMII(SERDES1G(2), 2, HSIO_HW_CFG_DEV1G_4_MODE, 0),
SERDES_MUX_SGMII(SERDES1G(2), 4, HSIO_HW_CFG_QSGMII_ENA |
HSIO_HW_CFG_DEV1G_4_MODE, HSIO_HW_CFG_DEV1G_4_MODE),
SERDES_MUX_SGMII(SERDES1G(3), 3, HSIO_HW_CFG_DEV1G_6_MODE, 0),
SERDES_MUX_SGMII(SERDES1G(3), 6, HSIO_HW_CFG_QSGMII_ENA |
HSIO_HW_CFG_DEV1G_6_MODE, HSIO_HW_CFG_DEV1G_6_MODE),
SERDES_MUX_SGMII(SERDES1G(4), 4, HSIO_HW_CFG_QSGMII_ENA |
HSIO_HW_CFG_DEV1G_4_MODE | HSIO_HW_CFG_DEV1G_9_MODE,
0),
SERDES_MUX_SGMII(SERDES1G(4), 9, HSIO_HW_CFG_DEV1G_4_MODE |
HSIO_HW_CFG_DEV1G_9_MODE, HSIO_HW_CFG_DEV1G_4_MODE |
HSIO_HW_CFG_DEV1G_9_MODE),
SERDES_MUX_SGMII(SERDES1G(5), 5, HSIO_HW_CFG_QSGMII_ENA |
HSIO_HW_CFG_DEV1G_5_MODE | HSIO_HW_CFG_DEV2G5_10_MODE,
0),
SERDES_MUX_SGMII(SERDES1G(5), 10, HSIO_HW_CFG_PCIE_ENA |
HSIO_HW_CFG_DEV1G_5_MODE | HSIO_HW_CFG_DEV2G5_10_MODE,
HSIO_HW_CFG_DEV1G_5_MODE | HSIO_HW_CFG_DEV2G5_10_MODE),
SERDES_MUX_QSGMII(SERDES6G(0), 4, HSIO_HW_CFG_QSGMII_ENA,
HSIO_HW_CFG_QSGMII_ENA),
SERDES_MUX_QSGMII(SERDES6G(0), 5, HSIO_HW_CFG_QSGMII_ENA,
HSIO_HW_CFG_QSGMII_ENA),
SERDES_MUX_QSGMII(SERDES6G(0), 6, HSIO_HW_CFG_QSGMII_ENA,
HSIO_HW_CFG_QSGMII_ENA),
SERDES_MUX_SGMII(SERDES6G(0), 7, HSIO_HW_CFG_QSGMII_ENA, 0),
SERDES_MUX_QSGMII(SERDES6G(0), 7, HSIO_HW_CFG_QSGMII_ENA,
HSIO_HW_CFG_QSGMII_ENA),
SERDES_MUX_SGMII(SERDES6G(1), 8, 0, 0),
SERDES_MUX_SGMII(SERDES6G(2), 10, HSIO_HW_CFG_PCIE_ENA |
HSIO_HW_CFG_DEV2G5_10_MODE, 0),
SERDES_MUX(SERDES6G(2), 10, PHY_MODE_PCIE, 0, HSIO_HW_CFG_PCIE_ENA,
HSIO_HW_CFG_PCIE_ENA),
};
static int serdes_set_mode(struct phy *phy, enum phy_mode mode, int submode)
{
struct serdes_macro *macro = phy_get_drvdata(phy);
unsigned int i;
int ret;
/* As of now only PHY_MODE_ETHERNET is supported */
if (mode != PHY_MODE_ETHERNET)
return -EOPNOTSUPP;
for (i = 0; i < ARRAY_SIZE(ocelot_serdes_muxes); i++) {
if (macro->idx != ocelot_serdes_muxes[i].idx ||
mode != ocelot_serdes_muxes[i].mode ||
submode != ocelot_serdes_muxes[i].submode)
continue;
if (submode != PHY_INTERFACE_MODE_QSGMII &&
macro->port != ocelot_serdes_muxes[i].port)
continue;
ret = regmap_update_bits(macro->ctrl->regs, HSIO_HW_CFG,
ocelot_serdes_muxes[i].mask,
ocelot_serdes_muxes[i].mux);
if (ret)
return ret;
if (macro->idx <= SERDES1G_MAX)
return serdes_init_s1g(macro->ctrl->regs, macro->idx);
/* SERDES6G and PCIe not supported yet */
return -EOPNOTSUPP;
}
return -EINVAL;
}
static const struct phy_ops serdes_ops = {
.set_mode = serdes_set_mode,
.owner = THIS_MODULE,
};
static struct phy *serdes_simple_xlate(struct device *dev,
struct of_phandle_args *args)
{
struct serdes_ctrl *ctrl = dev_get_drvdata(dev);
unsigned int port, idx, i;
if (args->args_count != 2)
return ERR_PTR(-EINVAL);
port = args->args[0];
idx = args->args[1];
for (i = 0; i < SERDES_MAX; i++) {
struct serdes_macro *macro = phy_get_drvdata(ctrl->phys[i]);
if (idx != macro->idx)
continue;
/* SERDES6G(0) is the only SerDes capable of QSGMII */
if (idx != SERDES6G(0) && macro->port >= 0)
return ERR_PTR(-EBUSY);
macro->port = port;
return ctrl->phys[i];
}
return ERR_PTR(-ENODEV);
}
static int serdes_phy_create(struct serdes_ctrl *ctrl, u8 idx, struct phy **phy)
{
struct serdes_macro *macro;
*phy = devm_phy_create(ctrl->dev, NULL, &serdes_ops);
if (IS_ERR(*phy))
return PTR_ERR(*phy);
macro = devm_kzalloc(ctrl->dev, sizeof(*macro), GFP_KERNEL);
if (!macro)
return -ENOMEM;
macro->idx = idx;
macro->ctrl = ctrl;
macro->port = -1;
phy_set_drvdata(*phy, macro);
return 0;
}
static int serdes_probe(struct platform_device *pdev)
{
struct phy_provider *provider;
struct serdes_ctrl *ctrl;
unsigned int i;
int ret;
ctrl = devm_kzalloc(&pdev->dev, sizeof(*ctrl), GFP_KERNEL);
if (!ctrl)
return -ENOMEM;
ctrl->dev = &pdev->dev;
ctrl->regs = syscon_node_to_regmap(pdev->dev.parent->of_node);
if (IS_ERR(ctrl->regs))
return PTR_ERR(ctrl->regs);
for (i = 0; i < SERDES_MAX; i++) {
ret = serdes_phy_create(ctrl, i, &ctrl->phys[i]);
if (ret)
return ret;
}
dev_set_drvdata(&pdev->dev, ctrl);
provider = devm_of_phy_provider_register(ctrl->dev,
serdes_simple_xlate);
return PTR_ERR_OR_ZERO(provider);
}
static const struct of_device_id serdes_ids[] = {
{ .compatible = "mscc,vsc7514-serdes", },
{},
};
MODULE_DEVICE_TABLE(of, serdes_ids);
static struct platform_driver mscc_ocelot_serdes = {
.probe = serdes_probe,
.driver = {
.name = "mscc,ocelot-serdes",
.of_match_table = of_match_ptr(serdes_ids),
},
};
module_platform_driver(mscc_ocelot_serdes);
MODULE_AUTHOR("Quentin Schulz <quentin.schulz@bootlin.com>");
MODULE_DESCRIPTION("SerDes driver for Microsemi Ocelot");
MODULE_LICENSE("Dual MIT/GPL");
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