From 6b81f05a8755a63d1acbcc1604f1e0f4534d36d8 Mon Sep 17 00:00:00 2001 From: Swapnil Jakhade Date: Thu, 23 Dec 2021 07:01:34 +0100 Subject: phy: cadence: Sierra: Add support for PHY multilink configurations Add support for multilink configuration of Sierra PHY. Currently, maximum two links are supported. Signed-off-by: Swapnil Jakhade Reviewed-by: Aswath Govindraju Link: https://lore.kernel.org/r/20211223060137.9252-13-sjakhade@cadence.com Signed-off-by: Vinod Koul --- drivers/phy/cadence/phy-cadence-sierra.c | 198 +++++++++++++++++++++++++++++-- 1 file changed, 190 insertions(+), 8 deletions(-) (limited to 'drivers/phy') diff --git a/drivers/phy/cadence/phy-cadence-sierra.c b/drivers/phy/cadence/phy-cadence-sierra.c index abdbc6ebd5a8..8f356bf38be8 100644 --- a/drivers/phy/cadence/phy-cadence-sierra.c +++ b/drivers/phy/cadence/phy-cadence-sierra.c @@ -24,7 +24,7 @@ #include #define NUM_SSC_MODE 3 -#define NUM_PHY_TYPE 3 +#define NUM_PHY_TYPE 4 /* PHY register offsets */ #define SIERRA_COMMON_CDB_OFFSET 0x0 @@ -184,6 +184,13 @@ (0xE000 << (block_offset)) #define SIERRA_PHY_PMA_CMN_CTRL 0x000 +/* PHY PMA lane registers */ +#define SIERRA_PHY_PMA_LANE_CDB_OFFSET(ln, block_offset, reg_offset) \ + ((0xF000 << (block_offset)) + \ + (((ln) << 8) << (reg_offset))) + +#define SIERRA_PHY_PMA_XCVR_CTRL 0x000 + #define SIERRA_MACRO_ID 0x00007364 #define SIERRA_MAX_LANES 16 #define PLL_LOCK_TIME 100000 @@ -299,6 +306,8 @@ struct cdns_sierra_data { u8 reg_offset_shift; struct cdns_sierra_vals *pcs_cmn_vals[NUM_PHY_TYPE][NUM_PHY_TYPE] [NUM_SSC_MODE]; + struct cdns_sierra_vals *phy_pma_ln_vals[NUM_PHY_TYPE][NUM_PHY_TYPE] + [NUM_SSC_MODE]; struct cdns_sierra_vals *pma_cmn_vals[NUM_PHY_TYPE][NUM_PHY_TYPE] [NUM_SSC_MODE]; struct cdns_sierra_vals *pma_ln_vals[NUM_PHY_TYPE][NUM_PHY_TYPE] @@ -322,6 +331,7 @@ struct cdns_sierra_phy { struct regmap *regmap_phy_pcs_common_cdb; struct regmap *regmap_phy_pcs_lane_cdb[SIERRA_MAX_LANES]; struct regmap *regmap_phy_pma_common_cdb; + struct regmap *regmap_phy_pma_lane_cdb[SIERRA_MAX_LANES]; struct regmap *regmap_common_cdb; struct regmap_field *macro_id_type; struct regmap_field *phy_pll_cfg_1; @@ -438,6 +448,34 @@ static const struct regmap_config cdns_sierra_phy_pma_cmn_cdb_config = { .reg_read = cdns_regmap_read, }; +#define SIERRA_PHY_PMA_LANE_CDB_REGMAP_CONF(n) \ +{ \ + .name = "sierra_phy_pma_lane" n "_cdb", \ + .reg_stride = 1, \ + .fast_io = true, \ + .reg_write = cdns_regmap_write, \ + .reg_read = cdns_regmap_read, \ +} + +static const struct regmap_config cdns_sierra_phy_pma_lane_cdb_config[] = { + SIERRA_PHY_PMA_LANE_CDB_REGMAP_CONF("0"), + SIERRA_PHY_PMA_LANE_CDB_REGMAP_CONF("1"), + SIERRA_PHY_PMA_LANE_CDB_REGMAP_CONF("2"), + SIERRA_PHY_PMA_LANE_CDB_REGMAP_CONF("3"), + SIERRA_PHY_PMA_LANE_CDB_REGMAP_CONF("4"), + SIERRA_PHY_PMA_LANE_CDB_REGMAP_CONF("5"), + SIERRA_PHY_PMA_LANE_CDB_REGMAP_CONF("6"), + SIERRA_PHY_PMA_LANE_CDB_REGMAP_CONF("7"), + SIERRA_PHY_PMA_LANE_CDB_REGMAP_CONF("8"), + SIERRA_PHY_PMA_LANE_CDB_REGMAP_CONF("9"), + SIERRA_PHY_PMA_LANE_CDB_REGMAP_CONF("10"), + SIERRA_PHY_PMA_LANE_CDB_REGMAP_CONF("11"), + SIERRA_PHY_PMA_LANE_CDB_REGMAP_CONF("12"), + SIERRA_PHY_PMA_LANE_CDB_REGMAP_CONF("13"), + SIERRA_PHY_PMA_LANE_CDB_REGMAP_CONF("14"), + SIERRA_PHY_PMA_LANE_CDB_REGMAP_CONF("15"), +}; + static int cdns_sierra_phy_init(struct phy *gphy) { struct cdns_sierra_inst *ins = phy_get_drvdata(gphy); @@ -446,6 +484,7 @@ static int cdns_sierra_phy_init(struct phy *gphy) struct cdns_sierra_vals *pma_cmn_vals, *pma_ln_vals; enum cdns_sierra_phy_type phy_type = ins->phy_type; enum cdns_sierra_ssc_mode ssc = ins->ssc_mode; + struct cdns_sierra_vals *phy_pma_ln_vals; const struct cdns_reg_pairs *reg_pairs; struct cdns_sierra_vals *pcs_cmn_vals; struct regmap *regmap; @@ -453,7 +492,7 @@ static int cdns_sierra_phy_init(struct phy *gphy) int i, j; /* Initialise the PHY registers, unless auto configured */ - if (phy->autoconf) + if (phy->autoconf || phy->nsubnodes > 1) return 0; clk_set_rate(phy->input_clks[CMN_REFCLK_DIG_DIV], 25000000); @@ -469,6 +508,18 @@ static int cdns_sierra_phy_init(struct phy *gphy) regmap_write(regmap, reg_pairs[i].off, reg_pairs[i].val); } + /* PHY PMA lane registers configurations */ + phy_pma_ln_vals = init_data->phy_pma_ln_vals[phy_type][TYPE_NONE][ssc]; + if (phy_pma_ln_vals) { + reg_pairs = phy_pma_ln_vals->reg_pairs; + num_regs = phy_pma_ln_vals->num_regs; + for (i = 0; i < ins->num_lanes; i++) { + regmap = phy->regmap_phy_pma_lane_cdb[i + ins->mlane]; + for (j = 0; j < num_regs; j++) + regmap_write(regmap, reg_pairs[j].off, reg_pairs[j].val); + } + } + /* PMA common registers configurations */ pma_cmn_vals = init_data->pma_cmn_vals[phy_type][TYPE_NONE][ssc]; if (pma_cmn_vals) { @@ -502,10 +553,13 @@ static int cdns_sierra_phy_on(struct phy *gphy) u32 val; int ret; - ret = reset_control_deassert(sp->phy_rst); - if (ret) { - dev_err(dev, "Failed to take the PHY out of reset\n"); - return ret; + if (sp->nsubnodes == 1) { + /* Take the PHY out of reset */ + ret = reset_control_deassert(sp->phy_rst); + if (ret) { + dev_err(dev, "Failed to take the PHY out of reset\n"); + return ret; + } } /* Take the PHY lane group out of reset */ @@ -923,6 +977,19 @@ static int cdns_regmap_init_blocks(struct cdns_sierra_phy *sp, } sp->regmap_phy_pma_common_cdb = regmap; + for (i = 0; i < SIERRA_MAX_LANES; i++) { + block_offset = SIERRA_PHY_PMA_LANE_CDB_OFFSET(i, block_offset_shift, + reg_offset_shift); + regmap = cdns_regmap_init(dev, base, block_offset, + reg_offset_shift, + &cdns_sierra_phy_pma_lane_cdb_config[i]); + if (IS_ERR(regmap)) { + dev_err(dev, "Failed to init PHY PMA lane CDB regmap\n"); + return PTR_ERR(regmap); + } + sp->regmap_phy_pma_lane_cdb[i] = regmap; + } + return 0; } @@ -1030,6 +1097,118 @@ static int cdns_sierra_phy_get_resets(struct cdns_sierra_phy *sp, return 0; } +static int cdns_sierra_phy_configure_multilink(struct cdns_sierra_phy *sp) +{ + const struct cdns_sierra_data *init_data = sp->init_data; + struct cdns_sierra_vals *pma_cmn_vals, *pma_ln_vals; + enum cdns_sierra_phy_type phy_t1, phy_t2; + struct cdns_sierra_vals *phy_pma_ln_vals; + const struct cdns_reg_pairs *reg_pairs; + struct cdns_sierra_vals *pcs_cmn_vals; + int i, j, node, mlane, num_lanes, ret; + enum cdns_sierra_ssc_mode ssc; + struct regmap *regmap; + u32 num_regs; + + /* Maximum 2 links (subnodes) are supported */ + if (sp->nsubnodes != 2) + return -EINVAL; + + clk_set_rate(sp->input_clks[CMN_REFCLK_DIG_DIV], 25000000); + clk_set_rate(sp->input_clks[CMN_REFCLK1_DIG_DIV], 25000000); + + /* PHY configured to use both PLL LC and LC1 */ + regmap_field_write(sp->phy_pll_cfg_1, 0x1); + + phy_t1 = sp->phys[0].phy_type; + phy_t2 = sp->phys[1].phy_type; + + /* + * PHY configuration for multi-link operation is done in two steps. + * e.g. Consider a case for a 4 lane PHY with PCIe using 2 lanes and QSGMII other 2 lanes. + * Sierra PHY has 2 PLLs, viz. PLLLC and PLLLC1. So in this case, PLLLC is used for PCIe + * and PLLLC1 is used for QSGMII. PHY is configured in two steps as described below. + * + * [1] For first step, phy_t1 = TYPE_PCIE and phy_t2 = TYPE_QSGMII + * So the register values are selected as [TYPE_PCIE][TYPE_QSGMII][ssc]. + * This will configure PHY registers associated for PCIe (i.e. first protocol) + * involving PLLLC registers and registers for first 2 lanes of PHY. + * [2] In second step, the variables phy_t1 and phy_t2 are swapped. So now, + * phy_t1 = TYPE_QSGMII and phy_t2 = TYPE_PCIE. And the register values are selected as + * [TYPE_QSGMII][TYPE_PCIE][ssc]. + * This will configure PHY registers associated for QSGMII (i.e. second protocol) + * involving PLLLC1 registers and registers for other 2 lanes of PHY. + * + * This completes the PHY configuration for multilink operation. This approach enables + * dividing the large number of PHY register configurations into protocol specific + * smaller groups. + */ + for (node = 0; node < sp->nsubnodes; node++) { + if (node == 1) { + /* + * If first link with phy_t1 is configured, then configure the PHY for + * second link with phy_t2. Get the array values as [phy_t2][phy_t1][ssc]. + */ + swap(phy_t1, phy_t2); + } + + mlane = sp->phys[node].mlane; + ssc = sp->phys[node].ssc_mode; + num_lanes = sp->phys[node].num_lanes; + + /* PHY PCS common registers configurations */ + pcs_cmn_vals = init_data->pcs_cmn_vals[phy_t1][phy_t2][ssc]; + if (pcs_cmn_vals) { + reg_pairs = pcs_cmn_vals->reg_pairs; + num_regs = pcs_cmn_vals->num_regs; + regmap = sp->regmap_phy_pcs_common_cdb; + for (i = 0; i < num_regs; i++) + regmap_write(regmap, reg_pairs[i].off, reg_pairs[i].val); + } + + /* PHY PMA lane registers configurations */ + phy_pma_ln_vals = init_data->phy_pma_ln_vals[phy_t1][phy_t2][ssc]; + if (phy_pma_ln_vals) { + reg_pairs = phy_pma_ln_vals->reg_pairs; + num_regs = phy_pma_ln_vals->num_regs; + for (i = 0; i < num_lanes; i++) { + regmap = sp->regmap_phy_pma_lane_cdb[i + mlane]; + for (j = 0; j < num_regs; j++) + regmap_write(regmap, reg_pairs[j].off, reg_pairs[j].val); + } + } + + /* PMA common registers configurations */ + pma_cmn_vals = init_data->pma_cmn_vals[phy_t1][phy_t2][ssc]; + if (pma_cmn_vals) { + reg_pairs = pma_cmn_vals->reg_pairs; + num_regs = pma_cmn_vals->num_regs; + regmap = sp->regmap_common_cdb; + for (i = 0; i < num_regs; i++) + regmap_write(regmap, reg_pairs[i].off, reg_pairs[i].val); + } + + /* PMA lane registers configurations */ + pma_ln_vals = init_data->pma_ln_vals[phy_t1][phy_t2][ssc]; + if (pma_ln_vals) { + reg_pairs = pma_ln_vals->reg_pairs; + num_regs = pma_ln_vals->num_regs; + for (i = 0; i < num_lanes; i++) { + regmap = sp->regmap_lane_cdb[i + mlane]; + for (j = 0; j < num_regs; j++) + regmap_write(regmap, reg_pairs[j].off, reg_pairs[j].val); + } + } + } + + /* Take the PHY out of reset */ + ret = reset_control_deassert(sp->phy_rst); + if (ret) + return ret; + + return 0; +} + static int cdns_sierra_phy_probe(struct platform_device *pdev) { struct cdns_sierra_phy *sp; @@ -1149,8 +1328,11 @@ static int cdns_sierra_phy_probe(struct platform_device *pdev) } /* If more than one subnode, configure the PHY as multilink */ - if (!sp->autoconf && sp->nsubnodes > 1) - regmap_field_write(sp->phy_pll_cfg_1, 0x1); + if (!sp->autoconf && sp->nsubnodes > 1) { + ret = cdns_sierra_phy_configure_multilink(sp); + if (ret) + goto put_child2; + } pm_runtime_enable(dev); phy_provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate); -- cgit v1.2.3-58-ga151