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phy: cadence-torrent: Add support to drive refclk out

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cmn_refclk_<p/m> lines in Torrent SERDES is used for connecting external
reference clock. cmn_refclk_<p/m> can also be configured to output the
reference clock. Model this derived reference clock as a "clock" so that
platforms like AM642 EVM can enable it.

This is used by PCIe to use the same refclk both in local SERDES
and remote device. Add support here to drive refclk out.

Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>
Reviewed-by: Swapnil Jakhade <sjakhade@cadence.com>
Link: https://lore.kernel.org/r/20210310120840.16447-7-kishon@ti.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
This commit is contained in:
Kishon Vijay Abraham I 2021-03-10 17:38:40 +05:30 committed by Vinod Koul
parent 9e405f87b6
commit 2cca0228f3
2 changed files with 186 additions and 3 deletions
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1
drivers/phy/cadence/Kconfig
View File

@ -7,6 +7,7 @@ config PHY_CADENCE_TORRENT
tristate "Cadence Torrent PHY driver"
depends on OF
depends on HAS_IOMEM
depends on COMMON_CLK
select GENERIC_PHY
help
Support for Cadence Torrent PHY.

188
drivers/phy/cadence/phy-cadence-torrent.c
View File

@ -7,7 +7,9 @@
*/
#include <dt-bindings/phy/phy.h>
#include <dt-bindings/phy/phy-cadence-torrent.h>
#include <linux/clk.h>
#include <linux/clk-provider.h>
#include <linux/delay.h>
#include <linux/err.h>
#include <linux/io.h>
@ -84,6 +86,8 @@
#define CMN_PLLSM1_PLLLOCK_TMR 0x0034U
#define CMN_CDIAG_CDB_PWRI_OVRD 0x0041U
#define CMN_CDIAG_XCVRC_PWRI_OVRD 0x0047U
#define CMN_CDIAG_REFCLK_OVRD 0x004CU
#define CMN_CDIAG_REFCLK_DRV0_CTRL 0x0050U
#define CMN_BGCAL_INIT_TMR 0x0064U
#define CMN_BGCAL_ITER_TMR 0x0065U
#define CMN_IBCAL_INIT_TMR 0x0074U
@ -206,6 +210,7 @@
#define RX_DIAG_ACYA 0x01FFU
/* PHY PCS common registers */
#define PHY_PIPE_CMN_CTRL1 0x0000U
#define PHY_PLL_CFG 0x000EU
#define PHY_PIPE_USB3_GEN2_PRE_CFG0 0x0020U
#define PHY_PIPE_USB3_GEN2_POST_CFG0 0x0022U
@ -216,6 +221,10 @@
#define PHY_PMA_CMN_CTRL2 0x0001U
#define PHY_PMA_PLL_RAW_CTRL 0x0003U
static const char * const clk_names[] = {
[CDNS_TORRENT_REFCLK_DRIVER] = "refclk-driver",
};
static const struct reg_field phy_pll_cfg =
REG_FIELD(PHY_PLL_CFG, 0, 1);
@ -231,6 +240,26 @@ static const struct reg_field phy_pma_pll_raw_ctrl =
static const struct reg_field phy_reset_ctrl =
REG_FIELD(PHY_RESET, 8, 8);
static const struct reg_field phy_pipe_cmn_ctrl1_0 = REG_FIELD(PHY_PIPE_CMN_CTRL1, 0, 0);
#define REFCLK_OUT_NUM_CMN_CONFIG 5
enum cdns_torrent_refclk_out_cmn {
CMN_CDIAG_REFCLK_OVRD_4,
CMN_CDIAG_REFCLK_DRV0_CTRL_1,
CMN_CDIAG_REFCLK_DRV0_CTRL_4,
CMN_CDIAG_REFCLK_DRV0_CTRL_5,
CMN_CDIAG_REFCLK_DRV0_CTRL_6,
};
static const struct reg_field refclk_out_cmn_cfg[] = {
[CMN_CDIAG_REFCLK_OVRD_4] = REG_FIELD(CMN_CDIAG_REFCLK_OVRD, 4, 4),
[CMN_CDIAG_REFCLK_DRV0_CTRL_1] = REG_FIELD(CMN_CDIAG_REFCLK_DRV0_CTRL, 1, 1),
[CMN_CDIAG_REFCLK_DRV0_CTRL_4] = REG_FIELD(CMN_CDIAG_REFCLK_DRV0_CTRL, 4, 4),
[CMN_CDIAG_REFCLK_DRV0_CTRL_5] = REG_FIELD(CMN_CDIAG_REFCLK_DRV0_CTRL, 5, 5),
[CMN_CDIAG_REFCLK_DRV0_CTRL_6] = REG_FIELD(CMN_CDIAG_REFCLK_DRV0_CTRL, 6, 6),
};
enum cdns_torrent_phy_type {
TYPE_NONE,
TYPE_DP,
@ -279,6 +308,8 @@ struct cdns_torrent_phy {
struct regmap_field *phy_pma_cmn_ctrl_2;
struct regmap_field *phy_pma_pll_raw_ctrl;
struct regmap_field *phy_reset_ctrl;
struct clk *clks[CDNS_TORRENT_REFCLK_DRIVER + 1];
struct clk_onecell_data clk_data;
};
enum phy_powerstate {
@ -288,6 +319,16 @@ enum phy_powerstate {
POWERSTATE_A3 = 3,
};
struct cdns_torrent_derived_refclk {
struct clk_hw hw;
struct regmap_field *phy_pipe_cmn_ctrl1_0;
struct regmap_field *cmn_fields[REFCLK_OUT_NUM_CMN_CONFIG];
struct clk_init_data clk_data;
};
#define to_cdns_torrent_derived_refclk(_hw) \
container_of(_hw, struct cdns_torrent_derived_refclk, hw)
static int cdns_torrent_phy_init(struct phy *phy);
static int cdns_torrent_dp_init(struct phy *phy);
static int cdns_torrent_dp_run(struct cdns_torrent_phy *cdns_phy,
@ -1604,6 +1645,108 @@ static int cdns_torrent_dp_run(struct cdns_torrent_phy *cdns_phy, u32 num_lanes)
return ret;
}
static int cdns_torrent_derived_refclk_enable(struct clk_hw *hw)
{
struct cdns_torrent_derived_refclk *derived_refclk = to_cdns_torrent_derived_refclk(hw);
regmap_field_write(derived_refclk->cmn_fields[CMN_CDIAG_REFCLK_DRV0_CTRL_6], 0);
regmap_field_write(derived_refclk->cmn_fields[CMN_CDIAG_REFCLK_DRV0_CTRL_4], 1);
regmap_field_write(derived_refclk->cmn_fields[CMN_CDIAG_REFCLK_DRV0_CTRL_5], 1);
regmap_field_write(derived_refclk->cmn_fields[CMN_CDIAG_REFCLK_DRV0_CTRL_1], 0);
regmap_field_write(derived_refclk->cmn_fields[CMN_CDIAG_REFCLK_OVRD_4], 1);
regmap_field_write(derived_refclk->phy_pipe_cmn_ctrl1_0, 1);
return 0;
}
static void cdns_torrent_derived_refclk_disable(struct clk_hw *hw)
{
struct cdns_torrent_derived_refclk *derived_refclk = to_cdns_torrent_derived_refclk(hw);
regmap_field_write(derived_refclk->phy_pipe_cmn_ctrl1_0, 0);
}
static int cdns_torrent_derived_refclk_is_enabled(struct clk_hw *hw)
{
struct cdns_torrent_derived_refclk *derived_refclk = to_cdns_torrent_derived_refclk(hw);
int val;
regmap_field_read(derived_refclk->phy_pipe_cmn_ctrl1_0, &val);
return !!val;
}
static const struct clk_ops cdns_torrent_derived_refclk_ops = {
.enable = cdns_torrent_derived_refclk_enable,
.disable = cdns_torrent_derived_refclk_disable,
.is_enabled = cdns_torrent_derived_refclk_is_enabled,
};
static int cdns_torrent_derived_refclk_register(struct cdns_torrent_phy *cdns_phy)
{
struct cdns_torrent_derived_refclk *derived_refclk;
struct device *dev = cdns_phy->dev;
struct regmap_field *field;
struct clk_init_data *init;
const char *parent_name;
struct regmap *regmap;
char clk_name[100];
struct clk *clk;
int i;
derived_refclk = devm_kzalloc(dev, sizeof(*derived_refclk), GFP_KERNEL);
if (!derived_refclk)
return -ENOMEM;
snprintf(clk_name, sizeof(clk_name), "%s_%s", dev_name(dev),
clk_names[CDNS_TORRENT_REFCLK_DRIVER]);
clk = devm_clk_get_optional(dev, "phy_en_refclk");
if (IS_ERR(clk)) {
dev_err(dev, "No parent clock for derived_refclk\n");
return PTR_ERR(clk);
}
init = &derived_refclk->clk_data;
if (clk) {
parent_name = __clk_get_name(clk);
init->parent_names = &parent_name;
init->num_parents = 1;
}
init->ops = &cdns_torrent_derived_refclk_ops;
init->flags = 0;
init->name = clk_name;
regmap = cdns_phy->regmap_phy_pcs_common_cdb;
field = devm_regmap_field_alloc(dev, regmap, phy_pipe_cmn_ctrl1_0);
if (IS_ERR(field)) {
dev_err(dev, "phy_pipe_cmn_ctrl1_0 reg field init failed\n");
return PTR_ERR(field);
}
derived_refclk->phy_pipe_cmn_ctrl1_0 = field;
regmap = cdns_phy->regmap_common_cdb;
for (i = 0; i < REFCLK_OUT_NUM_CMN_CONFIG; i++) {
field = devm_regmap_field_alloc(dev, regmap, refclk_out_cmn_cfg[i]);
if (IS_ERR(field)) {
dev_err(dev, "CMN reg field init failed\n");
return PTR_ERR(field);
}
derived_refclk->cmn_fields[i] = field;
}
derived_refclk->hw.init = init;
clk = devm_clk_register(dev, &derived_refclk->hw);
if (IS_ERR(clk))
return PTR_ERR(clk);
cdns_phy->clks[CDNS_TORRENT_REFCLK_DRIVER] = clk;
return 0;
}
static int cdns_torrent_phy_on(struct phy *phy)
{
struct cdns_torrent_inst *inst = phy_get_drvdata(phy);
@ -2071,6 +2214,37 @@ int cdns_torrent_phy_configure_multilink(struct cdns_torrent_phy *cdns_phy)
return 0;
}
static void cdns_torrent_clk_cleanup(struct cdns_torrent_phy *cdns_phy)
{
struct device *dev = cdns_phy->dev;
of_clk_del_provider(dev->of_node);
}
static int cdns_torrent_clk_register(struct cdns_torrent_phy *cdns_phy)
{
struct device *dev = cdns_phy->dev;
struct device_node *node = dev->of_node;
int ret;
ret = cdns_torrent_derived_refclk_register(cdns_phy);
if (ret) {
dev_err(dev, "failed to register derived refclk\n");
return ret;
}
cdns_phy->clk_data.clks = cdns_phy->clks;
cdns_phy->clk_data.clk_num = CDNS_TORRENT_REFCLK_DRIVER + 1;
ret = of_clk_add_provider(node, of_clk_src_onecell_get, &cdns_phy->clk_data);
if (ret) {
dev_err(dev, "Failed to add clock provider: %s\n", node->name);
return ret;
}
return 0;
}
static int cdns_torrent_phy_probe(struct platform_device *pdev)
{
struct cdns_torrent_phy *cdns_phy;
@ -2134,17 +2308,21 @@ static int cdns_torrent_phy_probe(struct platform_device *pdev)
if (ret)
return ret;
ret = cdns_torrent_clk_register(cdns_phy);
if (ret)
return ret;
ret = clk_prepare_enable(cdns_phy->clk);
if (ret) {
dev_err(cdns_phy->dev, "Failed to prepare ref clock\n");
return ret;
goto clk_cleanup;
}
cdns_phy->ref_clk_rate = clk_get_rate(cdns_phy->clk);
if (!(cdns_phy->ref_clk_rate)) {
dev_err(cdns_phy->dev, "Failed to get ref clock rate\n");
clk_disable_unprepare(cdns_phy->clk);
return -EINVAL;
ret = -EINVAL;
goto clk_disable;
}
/* Enable APB */
@ -2323,7 +2501,10 @@ put_lnk_rst:
reset_control_put(cdns_phy->phys[i].lnk_rst);
of_node_put(child);
reset_control_assert(cdns_phy->apb_rst);
clk_disable:
clk_disable_unprepare(cdns_phy->clk);
clk_cleanup:
cdns_torrent_clk_cleanup(cdns_phy);
return ret;
}
@ -2340,6 +2521,7 @@ static int cdns_torrent_phy_remove(struct platform_device *pdev)
}
clk_disable_unprepare(cdns_phy->clk);
cdns_torrent_clk_cleanup(cdns_phy);
return 0;
}