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phy: cadence-torrent: Add support for subnode bindings
Implement single link subnode support to the phy driver. Add reset support including PHY reset and individual lane reset. Signed-off-by: Swapnil Jakhade <sjakhade@cadence.com> Signed-off-by: Yuti Amonkar <yamonkar@cadence.com> Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>
This commit is contained in:
Swapnil Jakhade
Kishon Vijay Abraham I
parent
597bf3f1a6
commit
afa4ba059f
1 changed files with 223 additions and 81 deletions
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@ -6,6 +6,7 @@
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*
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*/
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#include <dt-bindings/phy/phy.h>
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#include <linux/clk.h>
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#include <linux/delay.h>
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#include <linux/err.h>
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@ -18,6 +19,7 @@
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#include <linux/of_device.h>
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#include <linux/phy/phy.h>
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#include <linux/platform_device.h>
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#include <linux/reset.h>
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#include <linux/regmap.h>
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#define REF_CLK_19_2MHz 19200000
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@ -183,14 +185,24 @@ static const struct reg_field phy_reset_ctrl =
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static const struct of_device_id cdns_torrent_phy_of_match[];
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struct cdns_torrent_inst {
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struct phy *phy;
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u32 mlane;
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u32 phy_type;
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u32 num_lanes;
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struct reset_control *lnk_rst;
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};
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struct cdns_torrent_phy {
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void __iomem *base; /* DPTX registers base */
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void __iomem *sd_base; /* SD0801 registers base */
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u32 num_lanes; /* Number of lanes to use */
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u32 max_bit_rate; /* Maximum link bit rate to use (in Mbps) */
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struct reset_control *phy_rst;
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struct device *dev;
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struct clk *clk;
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unsigned long ref_clk_rate;
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struct cdns_torrent_inst phys[MAX_NUM_LANES];
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int nsubnodes;
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struct regmap *regmap;
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struct regmap *regmap_common_cdb;
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struct regmap *regmap_phy_pcs_common_cdb;
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@ -217,7 +229,8 @@ static int cdns_torrent_dp_run(struct cdns_torrent_phy *cdns_phy,
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u32 num_lanes);
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static
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int cdns_torrent_dp_wait_pma_cmn_ready(struct cdns_torrent_phy *cdns_phy);
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static void cdns_torrent_dp_pma_cfg(struct cdns_torrent_phy *cdns_phy);
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static void cdns_torrent_dp_pma_cfg(struct cdns_torrent_phy *cdns_phy,
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struct cdns_torrent_inst *inst);
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static
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void cdns_torrent_dp_pma_cmn_cfg_19_2mhz(struct cdns_torrent_phy *cdns_phy);
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static
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@ -237,11 +250,15 @@ static int cdns_torrent_dp_configure(struct phy *phy,
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static int cdns_torrent_dp_set_power_state(struct cdns_torrent_phy *cdns_phy,
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u32 num_lanes,
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enum phy_powerstate powerstate);
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static int cdns_torrent_phy_on(struct phy *phy);
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static int cdns_torrent_phy_off(struct phy *phy);
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static const struct phy_ops cdns_torrent_phy_ops = {
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.init = cdns_torrent_dp_init,
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.exit = cdns_torrent_dp_exit,
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.configure = cdns_torrent_dp_configure,
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.power_on = cdns_torrent_phy_on,
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.power_off = cdns_torrent_phy_off,
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.owner = THIS_MODULE,
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};
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@ -564,7 +581,7 @@ static int cdns_torrent_dp_configure_rate(struct cdns_torrent_phy *cdns_phy,
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/*
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* Verify, that parameters to configure PHY with are correct.
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*/
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static int cdns_torrent_dp_verify_config(struct cdns_torrent_phy *cdns_phy,
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static int cdns_torrent_dp_verify_config(struct cdns_torrent_inst *inst,
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struct phy_configure_opts_dp *dp)
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{
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u8 i;
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@ -599,7 +616,7 @@ static int cdns_torrent_dp_verify_config(struct cdns_torrent_phy *cdns_phy,
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}
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/* Check against actual number of PHY's lanes. */
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if (dp->lanes > cdns_phy->num_lanes)
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if (dp->lanes > inst->num_lanes)
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return -EINVAL;
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/*
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@ -791,10 +808,11 @@ static void cdns_torrent_dp_set_voltages(struct cdns_torrent_phy *cdns_phy,
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static int cdns_torrent_dp_configure(struct phy *phy,
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union phy_configure_opts *opts)
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{
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struct cdns_torrent_phy *cdns_phy = phy_get_drvdata(phy);
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struct cdns_torrent_inst *inst = phy_get_drvdata(phy);
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struct cdns_torrent_phy *cdns_phy = dev_get_drvdata(phy->dev.parent);
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int ret;
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ret = cdns_torrent_dp_verify_config(cdns_phy, &opts->dp);
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ret = cdns_torrent_dp_verify_config(inst, &opts->dp);
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if (ret) {
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dev_err(&phy->dev, "invalid params for phy configure\n");
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return ret;
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@ -826,8 +844,8 @@ static int cdns_torrent_dp_init(struct phy *phy)
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{
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unsigned char lane_bits;
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int ret;
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struct cdns_torrent_phy *cdns_phy = phy_get_drvdata(phy);
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struct cdns_torrent_inst *inst = phy_get_drvdata(phy);
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struct cdns_torrent_phy *cdns_phy = dev_get_drvdata(phy->dev.parent);
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struct regmap *regmap = cdns_phy->regmap_dptx_phy_reg;
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ret = clk_prepare_enable(cdns_phy->clk);
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@ -856,19 +874,19 @@ static int cdns_torrent_dp_init(struct phy *phy)
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cdns_torrent_dp_write(regmap, PHY_AUX_CTRL, 0x0003); /* enable AUX */
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/* PHY PMA registers configuration function */
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cdns_torrent_dp_pma_cfg(cdns_phy);
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cdns_torrent_dp_pma_cfg(cdns_phy, inst);
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/*
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* Set lines power state to A0
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* Set lines pll clk enable to 0
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*/
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cdns_torrent_dp_set_a0_pll(cdns_phy, cdns_phy->num_lanes);
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cdns_torrent_dp_set_a0_pll(cdns_phy, inst->num_lanes);
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/*
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* release phy_l0*_reset_n and pma_tx_elec_idle_ln_* based on
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* used lanes
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*/
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lane_bits = (1 << cdns_phy->num_lanes) - 1;
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lane_bits = (1 << inst->num_lanes) - 1;
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cdns_torrent_dp_write(regmap, PHY_RESET,
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((0xF & ~lane_bits) << 4) | (0xF & lane_bits));
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@ -886,23 +904,25 @@ static int cdns_torrent_dp_init(struct phy *phy)
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cdns_phy->max_bit_rate,
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false);
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cdns_torrent_dp_pma_cmn_rate(cdns_phy, cdns_phy->max_bit_rate,
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cdns_phy->num_lanes);
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inst->num_lanes);
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/* take out of reset */
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regmap_field_write(cdns_phy->phy_reset_ctrl, 0x1);
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cdns_torrent_phy_on(phy);
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ret = cdns_torrent_dp_wait_pma_cmn_ready(cdns_phy);
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if (ret)
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return ret;
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ret = cdns_torrent_dp_run(cdns_phy, cdns_phy->num_lanes);
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ret = cdns_torrent_dp_run(cdns_phy, inst->num_lanes);
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return ret;
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}
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static int cdns_torrent_dp_exit(struct phy *phy)
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{
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struct cdns_torrent_phy *cdns_phy = phy_get_drvdata(phy);
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struct cdns_torrent_phy *cdns_phy = dev_get_drvdata(phy->dev.parent);
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clk_disable_unprepare(cdns_phy->clk);
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return 0;
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@ -926,7 +946,8 @@ int cdns_torrent_dp_wait_pma_cmn_ready(struct cdns_torrent_phy *cdns_phy)
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return 0;
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}
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static void cdns_torrent_dp_pma_cfg(struct cdns_torrent_phy *cdns_phy)
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static void cdns_torrent_dp_pma_cfg(struct cdns_torrent_phy *cdns_phy,
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struct cdns_torrent_inst *inst)
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{
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unsigned int i;
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@ -938,7 +959,7 @@ static void cdns_torrent_dp_pma_cfg(struct cdns_torrent_phy *cdns_phy)
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cdns_torrent_dp_pma_cmn_cfg_25mhz(cdns_phy);
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/* PMA lane configuration to deal with multi-link operation */
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for (i = 0; i < cdns_phy->num_lanes; i++)
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for (i = 0; i < inst->num_lanes; i++)
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cdns_torrent_dp_pma_lane_cfg(cdns_phy, i);
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}
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@ -1518,6 +1539,33 @@ static int cdns_torrent_dp_run(struct cdns_torrent_phy *cdns_phy, u32 num_lanes)
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return ret;
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}
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static int cdns_torrent_phy_on(struct phy *phy)
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{
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struct cdns_torrent_inst *inst = phy_get_drvdata(phy);
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struct cdns_torrent_phy *cdns_phy = dev_get_drvdata(phy->dev.parent);
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int ret;
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/* Take the PHY out of reset */
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ret = reset_control_deassert(cdns_phy->phy_rst);
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if (ret)
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return ret;
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/* Take the PHY lane group out of reset */
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return reset_control_deassert(inst->lnk_rst);
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}
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static int cdns_torrent_phy_off(struct phy *phy)
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{
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struct cdns_torrent_inst *inst = phy_get_drvdata(phy);
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struct cdns_torrent_phy *cdns_phy = dev_get_drvdata(phy->dev.parent);
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int ret;
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ret = reset_control_assert(cdns_phy->phy_rst);
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if (ret)
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return ret;
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return reset_control_assert(inst->lnk_rst);
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}
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static struct regmap *cdns_regmap_init(struct device *dev, void __iomem *base,
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u32 block_offset,
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@ -1664,8 +1712,8 @@ static int cdns_torrent_phy_probe(struct platform_device *pdev)
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struct phy_provider *phy_provider;
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const struct of_device_id *match;
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struct cdns_torrent_data *data;
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struct phy *phy;
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int err, ret;
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struct device_node *child;
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int ret, subnodes, node = 0, i;
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/* Get init data for this PHY */
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match = of_match_device(cdns_torrent_phy_of_match, dev);
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@ -1678,62 +1726,14 @@ static int cdns_torrent_phy_probe(struct platform_device *pdev)
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if (!cdns_phy)
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return -ENOMEM;
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cdns_phy->dev = &pdev->dev;
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dev_set_drvdata(dev, cdns_phy);
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cdns_phy->dev = dev;
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phy = devm_phy_create(dev, NULL, &cdns_torrent_phy_ops);
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if (IS_ERR(phy)) {
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dev_err(dev, "failed to create Torrent PHY\n");
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return PTR_ERR(phy);
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}
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regs = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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cdns_phy->sd_base = devm_ioremap_resource(&pdev->dev, regs);
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if (IS_ERR(cdns_phy->sd_base))
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return PTR_ERR(cdns_phy->sd_base);
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regs = platform_get_resource(pdev, IORESOURCE_MEM, 1);
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cdns_phy->base = devm_ioremap_resource(&pdev->dev, regs);
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if (IS_ERR(cdns_phy->base))
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return PTR_ERR(cdns_phy->base);
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err = device_property_read_u32(dev, "num_lanes",
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&cdns_phy->num_lanes);
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if (err)
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cdns_phy->num_lanes = DEFAULT_NUM_LANES;
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switch (cdns_phy->num_lanes) {
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case 1:
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case 2:
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case 4:
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/* valid number of lanes */
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break;
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default:
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dev_err(dev, "unsupported number of lanes: %d\n",
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cdns_phy->num_lanes);
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return -EINVAL;
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}
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err = device_property_read_u32(dev, "max_bit_rate",
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&cdns_phy->max_bit_rate);
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if (err)
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cdns_phy->max_bit_rate = DEFAULT_MAX_BIT_RATE;
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switch (cdns_phy->max_bit_rate) {
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case 1620:
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case 2160:
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case 2430:
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case 2700:
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case 3240:
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case 4320:
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case 5400:
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case 8100:
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/* valid bit rate */
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break;
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default:
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dev_err(dev, "unsupported max bit rate: %dMbps\n",
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cdns_phy->max_bit_rate);
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return -EINVAL;
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cdns_phy->phy_rst = devm_reset_control_get_exclusive_by_index(dev, 0);
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if (IS_ERR(cdns_phy->phy_rst)) {
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dev_err(dev, "%s: failed to get reset\n",
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dev->of_node->full_name);
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return PTR_ERR(cdns_phy->phy_rst);
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}
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cdns_phy->clk = devm_clk_get(dev, "refclk");
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@ -1742,27 +1742,168 @@ static int cdns_torrent_phy_probe(struct platform_device *pdev)
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return PTR_ERR(cdns_phy->clk);
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}
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phy_set_drvdata(phy, cdns_phy);
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regs = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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cdns_phy->sd_base = devm_ioremap_resource(&pdev->dev, regs);
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if (IS_ERR(cdns_phy->sd_base))
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return PTR_ERR(cdns_phy->sd_base);
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subnodes = of_get_available_child_count(dev->of_node);
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if (subnodes == 0) {
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dev_err(dev, "No available link subnodes found\n");
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return -EINVAL;
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} else if (subnodes != 1) {
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dev_err(dev, "Driver supports only one link subnode.\n");
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return -EINVAL;
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}
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for_each_available_child_of_node(dev->of_node, child) {
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struct phy *gphy;
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cdns_phy->phys[node].lnk_rst =
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of_reset_control_array_get_exclusive(child);
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if (IS_ERR(cdns_phy->phys[node].lnk_rst)) {
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dev_err(dev, "%s: failed to get reset\n",
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child->full_name);
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ret = PTR_ERR(cdns_phy->phys[node].lnk_rst);
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goto put_lnk_rst;
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}
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if (of_property_read_u32(child, "reg",
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&cdns_phy->phys[node].mlane)) {
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dev_err(dev, "%s: No \"reg\"-property.\n",
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child->full_name);
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ret = -EINVAL;
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goto put_child;
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}
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if (cdns_phy->phys[node].mlane != 0) {
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dev_err(dev,
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"%s: Driver supports only lane-0 as master lane.\n",
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child->full_name);
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ret = -EINVAL;
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goto put_child;
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}
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if (of_property_read_u32(child, "cdns,phy-type",
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&cdns_phy->phys[node].phy_type)) {
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dev_err(dev, "%s: No \"cdns,phy-type\"-property.\n",
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child->full_name);
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ret = -EINVAL;
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goto put_child;
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}
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cdns_phy->phys[node].num_lanes = DEFAULT_NUM_LANES;
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of_property_read_u32(child, "cdns,num-lanes",
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&cdns_phy->phys[node].num_lanes);
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if (cdns_phy->phys[node].phy_type == PHY_TYPE_DP) {
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switch (cdns_phy->phys[node].num_lanes) {
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case 1:
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case 2:
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case 4:
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/* valid number of lanes */
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break;
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default:
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dev_err(dev, "unsupported number of lanes: %d\n",
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cdns_phy->phys[node].num_lanes);
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ret = -EINVAL;
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goto put_child;
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}
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cdns_phy->max_bit_rate = DEFAULT_MAX_BIT_RATE;
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of_property_read_u32(child, "cdns,max-bit-rate",
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&cdns_phy->max_bit_rate);
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switch (cdns_phy->max_bit_rate) {
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case 1620:
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case 2160:
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case 2430:
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case 2700:
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case 3240:
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case 4320:
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case 5400:
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case 8100:
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/* valid bit rate */
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break;
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default:
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dev_err(dev, "unsupported max bit rate: %dMbps\n",
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cdns_phy->max_bit_rate);
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ret = -EINVAL;
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goto put_child;
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}
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/* DPTX registers */
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regs = platform_get_resource(pdev, IORESOURCE_MEM, 1);
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cdns_phy->base = devm_ioremap_resource(&pdev->dev,
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regs);
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if (IS_ERR(cdns_phy->base)) {
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ret = PTR_ERR(cdns_phy->base);
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goto put_child;
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}
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gphy = devm_phy_create(dev, child,
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&cdns_torrent_phy_ops);
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if (IS_ERR(gphy)) {
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ret = PTR_ERR(gphy);
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goto put_child;
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}
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dev_info(dev, "%d lanes, max bit rate %d.%03d Gbps\n",
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cdns_phy->phys[node].num_lanes,
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cdns_phy->max_bit_rate / 1000,
|
||||
cdns_phy->max_bit_rate % 1000);
|
||||
} else {
|
||||
dev_err(dev, "Driver supports only PHY_TYPE_DP\n");
|
||||
ret = -ENOTSUPP;
|
||||
goto put_child;
|
||||
}
|
||||
cdns_phy->phys[node].phy = gphy;
|
||||
phy_set_drvdata(gphy, &cdns_phy->phys[node]);
|
||||
|
||||
node++;
|
||||
}
|
||||
cdns_phy->nsubnodes = node;
|
||||
|
||||
ret = cdns_regmap_init_torrent_dp(cdns_phy, cdns_phy->sd_base,
|
||||
cdns_phy->base,
|
||||
data->block_offset_shift,
|
||||
data->reg_offset_shift);
|
||||
if (ret)
|
||||
return ret;
|
||||
goto put_lnk_rst;
|
||||
|
||||
ret = cdns_regfield_init(cdns_phy);
|
||||
if (ret)
|
||||
return ret;
|
||||
goto put_lnk_rst;
|
||||
|
||||
phy_provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate);
|
||||
if (IS_ERR(phy_provider)) {
|
||||
ret = PTR_ERR(phy_provider);
|
||||
goto put_lnk_rst;
|
||||
}
|
||||
|
||||
dev_info(dev, "%d lanes, max bit rate %d.%03d Gbps\n",
|
||||
cdns_phy->num_lanes,
|
||||
cdns_phy->max_bit_rate / 1000,
|
||||
cdns_phy->max_bit_rate % 1000);
|
||||
return 0;
|
||||
|
||||
return PTR_ERR_OR_ZERO(phy_provider);
|
||||
put_child:
|
||||
node++;
|
||||
put_lnk_rst:
|
||||
for (i = 0; i < node; i++)
|
||||
reset_control_put(cdns_phy->phys[i].lnk_rst);
|
||||
of_node_put(child);
|
||||
return ret;
|
||||
}
|
||||
|
||||
static int cdns_torrent_phy_remove(struct platform_device *pdev)
|
||||
{
|
||||
struct cdns_torrent_phy *cdns_phy = platform_get_drvdata(pdev);
|
||||
int i;
|
||||
|
||||
reset_control_assert(cdns_phy->phy_rst);
|
||||
for (i = 0; i < cdns_phy->nsubnodes; i++) {
|
||||
reset_control_assert(cdns_phy->phys[i].lnk_rst);
|
||||
reset_control_put(cdns_phy->phys[i].lnk_rst);
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static const struct cdns_torrent_data cdns_map_torrent = {
|
||||
|
|
@ -1790,6 +1931,7 @@ MODULE_DEVICE_TABLE(of, cdns_torrent_phy_of_match);
|
|||
|
||||
static struct platform_driver cdns_torrent_phy_driver = {
|
||||
.probe = cdns_torrent_phy_probe,
|
||||
.remove = cdns_torrent_phy_remove,
|
||||
.driver = {
|
||||
.name = "cdns-torrent-phy",
|
||||
.of_match_table = cdns_torrent_phy_of_match,
|
||||
|
|
|
|||
Loading…
Reference in a new issue