linux-kernel - [PATCH v4 3/3] phy: cdns-dphy: Add support for DPHY TX on J721e

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Message-ID: <20220623125433.18467-4-r-ravikumar@ti.com>
Date:   Thu, 23 Jun 2022 18:24:33 +0530
From:   Rahul T R <r-ravikumar@...com>
To:     <linux-phy@...ts.infradead.org>, <kishon@...com>,
        <vkoul@...nel.org>, <robh+dt@...nel.org>,
        <krzysztof.kozlowski+dt@...aro.org>
CC:     <p.yadav@...com>, <tomi.valkeinen@...asonboard.com>,
        <laurent.pinchart@...asonboard.com>,
        <linux-kernel@...r.kernel.org>, <jpawar@...ence.com>,
        <sjakhade@...ence.com>, <mparab@...ence.com>,
        <devicetree@...r.kernel.org>, <vigneshr@...com>,
        <lee.jones@...aro.org>, Rahul T R <r-ravikumar@...com>
Subject: [PATCH v4 3/3] 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@...com>
---
 drivers/phy/cadence/cdns-dphy.c | 61 +++++++++++++++++++++++++++++++++
 1 file changed, 61 insertions(+)

diff --git a/drivers/phy/cadence/cdns-dphy.c b/drivers/phy/cadence/cdns-dphy.c
index 14f951013b4f..3dfdfb33cd0a 100644
--- 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);
-- 
2.36.1