phy: cdns-dphy: Add support for DPHY TX on J721e

Add support new compatible for dphy-tx on j721e
and implement dphy ops required.

Signed-off-by: Rahul T R <r-ravikumar@ti.com>
Reviewed-by: Pratyush Yadav <p.yadav@ti.com>
Link: https://lore.kernel.org/r/20220623125433.18467-4-r-ravikumar@ti.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>

diff --git a/drivers/phy/cadence/cdns-dphy.c b/drivers/phy/cadence/cdns-dphy.c
index 14f951013b4f929cba298cd6528a66ef1ff970cd..3dfdfb33cd0ac7378210fdeae231be6123253975 100644 (file)
--- a/drivers/phy/cadence/cdns-dphy.c
+++ b/drivers/phy/cadence/cdns-dphy.c
@@ -7,6 +7,7 @@
 #include <linux/bitops.h>
 #include <linux/clk.h>
 #include <linux/io.h>
+#include <linux/iopoll.h>
 #include <linux/module.h>
 #include <linux/of_address.h>
 #include <linux/of_device.h>
@@ -18,6 +19,7 @@
 
 #define REG_WAKEUP_TIME_NS             800
 #define DPHY_PLL_RATE_HZ               108000000
+#define POLL_TIMEOUT_US                        1000
 
 /* DPHY registers */
 #define DPHY_PMA_CMN(reg)              (reg)
@@ -62,6 +64,18 @@
 #define DSI_NULL_FRAME_OVERHEAD                6
 #define DSI_EOT_PKT_SIZE               4
 
+#define DPHY_TX_J721E_WIZ_PLL_CTRL     0xF04
+#define DPHY_TX_J721E_WIZ_STATUS       0xF08
+#define DPHY_TX_J721E_WIZ_RST_CTRL     0xF0C
+#define DPHY_TX_J721E_WIZ_PSM_FREQ     0xF10
+
+#define DPHY_TX_J721E_WIZ_IPDIV                GENMASK(4, 0)
+#define DPHY_TX_J721E_WIZ_OPDIV                GENMASK(13, 8)
+#define DPHY_TX_J721E_WIZ_FBDIV                GENMASK(25, 16)
+#define DPHY_TX_J721E_WIZ_LANE_RSTB    BIT(31)
+#define DPHY_TX_WIZ_PLL_LOCK           BIT(31)
+#define DPHY_TX_WIZ_O_CMN_READY                BIT(31)
+
 struct cdns_dphy_cfg {
        u8 pll_ipdiv;
        u8 pll_opdiv;
@@ -210,6 +224,46 @@ static void cdns_dphy_ref_set_psm_div(struct cdns_dphy *dphy, u8 div)
               dphy->regs + DPHY_PSM_CFG);
 }
 
+static unsigned long cdns_dphy_j721e_get_wakeup_time_ns(struct cdns_dphy *dphy)
+{
+       /* Minimum wakeup time as per MIPI D-PHY spec v1.2 */
+       return 1000000;
+}
+
+static void cdns_dphy_j721e_set_pll_cfg(struct cdns_dphy *dphy,
+                                       const struct cdns_dphy_cfg *cfg)
+{
+       u32 status;
+
+       /*
+        * set the PWM and PLL Byteclk divider settings to recommended values
+        * which is same as that of in ref ops
+        */
+       writel(DPHY_CMN_PWM_HIGH(6) | DPHY_CMN_PWM_LOW(0x101) |
+              DPHY_CMN_PWM_DIV(0x8),
+              dphy->regs + DPHY_CMN_PWM);
+
+       writel((FIELD_PREP(DPHY_TX_J721E_WIZ_IPDIV, cfg->pll_ipdiv) |
+               FIELD_PREP(DPHY_TX_J721E_WIZ_OPDIV, cfg->pll_opdiv) |
+               FIELD_PREP(DPHY_TX_J721E_WIZ_FBDIV, cfg->pll_fbdiv)),
+               dphy->regs + DPHY_TX_J721E_WIZ_PLL_CTRL);
+
+       writel(DPHY_TX_J721E_WIZ_LANE_RSTB,
+              dphy->regs + DPHY_TX_J721E_WIZ_RST_CTRL);
+
+       readl_poll_timeout(dphy->regs + DPHY_TX_J721E_WIZ_PLL_CTRL, status,
+                          (status & DPHY_TX_WIZ_PLL_LOCK), 0, POLL_TIMEOUT_US);
+
+       readl_poll_timeout(dphy->regs + DPHY_TX_J721E_WIZ_STATUS, status,
+                          (status & DPHY_TX_WIZ_O_CMN_READY), 0,
+                          POLL_TIMEOUT_US);
+}
+
+static void cdns_dphy_j721e_set_psm_div(struct cdns_dphy *dphy, u8 div)
+{
+       writel(div, dphy->regs + DPHY_TX_J721E_WIZ_PSM_FREQ);
+}
+
 /*
  * This is the reference implementation of DPHY hooks. Specific integration of
  * this IP may have to re-implement some of them depending on how they decided
@@ -221,6 +275,12 @@ static const struct cdns_dphy_ops ref_dphy_ops = {
        .set_psm_div = cdns_dphy_ref_set_psm_div,
 };
 
+static const struct cdns_dphy_ops j721e_dphy_ops = {
+       .get_wakeup_time_ns = cdns_dphy_j721e_get_wakeup_time_ns,
+       .set_pll_cfg = cdns_dphy_j721e_set_pll_cfg,
+       .set_psm_div = cdns_dphy_j721e_set_psm_div,
+};
+
 static int cdns_dphy_config_from_opts(struct phy *phy,
                                      struct phy_configure_opts_mipi_dphy *opts,
                                      struct cdns_dphy_cfg *cfg)
@@ -408,6 +468,7 @@ static int cdns_dphy_remove(struct platform_device *pdev)
 
 static const struct of_device_id cdns_dphy_of_match[] = {
        { .compatible = "cdns,dphy", .data = &ref_dphy_ops },
+       { .compatible = "ti,j721e-dphy", .data = &j721e_dphy_ops },
        { /* sentinel */ },
 };
 MODULE_DEVICE_TABLE(of, cdns_dphy_of_match);