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Subject[PATCH 2/2] usb: typec: add PD sink port support for Intel Whiskey Cove PMIC Typc-C PHY driver
From: Chandra Sekhar Anagani <chandra.sekhar.anagani@intel.com>

This adds PD sink port support for the USB Type-C PHY on Intel WhiskeyCove
PMIC which is available on some of the Intel Broxton SoC based platforms.

This patch depends on these two patches:
https://lkml.org/lkml/2016/6/29/349
https://lkml.org/lkml/2016/6/29/350

Signed-off-by: Chandra Sekhar Anagani <chandra.sekhar.anagani@intel.com>
---
drivers/usb/typec/typec_wcove.c | 289 ++++++++++++++++++++++++++++++++++++----
1 file changed, 263 insertions(+), 26 deletions(-)

diff --git a/drivers/usb/typec/typec_wcove.c b/drivers/usb/typec/typec_wcove.c
index c7c2d28..a4250ba 100644
--- a/drivers/usb/typec/typec_wcove.c
+++ b/drivers/usb/typec/typec_wcove.c
@@ -3,6 +3,7 @@
*
* Copyright (C) 2016 Intel Corporation
* Author: Heikki Krogerus <heikki.krogerus@linux.intel.com>
+ * Author: Chandra Sekhar Anagani <chandra.sekhar.anagani@intel.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
@@ -10,9 +11,11 @@
*/

#include <linux/acpi.h>
+#include <linux/delay.h>
#include <linux/module.h>
#include <linux/interrupt.h>
#include <linux/usb/typec.h>
+#include <linux/usb/pd_sink.h>
#include <linux/platform_device.h>
#include <linux/mfd/intel_soc_pmic.h>

@@ -25,6 +28,7 @@
#define USBC_CONTROL3 0x7003
#define USBC_CC1_CTRL 0x7004
#define USBC_CC2_CTRL 0x7005
+#define USBC_CC_SEL 0x7006
#define USBC_STATUS1 0x7007
#define USBC_STATUS2 0x7008
#define USBC_STATUS3 0x7009
@@ -32,7 +36,16 @@
#define USBC_IRQ2 0x7016
#define USBC_IRQMASK1 0x7017
#define USBC_IRQMASK2 0x7018
-
+#define USBC_PD_CFG1 0x7019
+#define USBC_PD_CFG2 0x701a
+#define USBC_PD_CFG3 0x701b
+#define USBC_PD_STATUS 0x701c
+#define USBC_RX_STATUS 0x701d
+#define USBC_RX_INFO 0x701e
+#define USBC_TX_CMD 0x701f
+#define USBC_TX_INFO 0x7020
+#define USBC_RX_DATA_START 0x7028
+#define USBC_TX_DATA_START 0x7047
/* Register bits */

#define USBC_CONTROL1_MODE_DRP(r) ((r & ~0x7) | 4)
@@ -44,7 +57,9 @@
#define USBC_CONTROL3_PD_DIS BIT(1)

#define USBC_CC_CTRL_VCONN_EN BIT(1)
+#define USBC_CC_CTRL_TX_EN BIT(2)

+#define USBC_CC_SEL_CCSEL (BIT(0) | BIT(1))
#define USBC_STATUS1_DET_ONGOING BIT(6)
#define USBC_STATUS1_RSLT(r) (r & 0xf)
#define USBC_RSLT_NOTHING 0
@@ -79,11 +94,44 @@
USBC_IRQ2_RX_HR | USBC_IRQ2_RX_CR | \
USBC_IRQ2_TX_SUCCESS | USBC_IRQ2_TX_FAIL)

+#define USBC_PD_CFG1_ID_FILL BIT(7)
+
+#define USBC_PD_CFG2_SOP_RX BIT(0)
+
+#define USBC_PD_CFG3_SR_SOP2 (BIT(7) | BIT(6))
+#define USBC_PD_CFG3_SR_SOP1 (BIT(5) | BIT(4))
+#define USBC_PD_CFG3_SR_SOP0 (BIT(3) | BIT(2))
+#define USBC_PD_CFG3_DATAROLE BIT(1)
+#define USBC_PD_CFG3_PWRROLE BIT(0)
+
+#define USBC_TX_CMD_TXBUF_RDY BIT(0)
+#define USBC_TX_CMD_TX_START BIT(1)
+#define USBC_TX_CMD_TXBUF_CMD(r) ((r >> 5) & 0x7)
+
+#define USBC_TX_INFO_TX_SOP (BIT(0) | BIT(1) | BIT(2))
+#define USBC_TX_INFO_TX_RETRIES (BIT(3) | BIT(4) | BIT(5))
+
+#define USBC_RX_STATUS_RX_DATA BIT(7)
+#define USBC_RX_STATUS_RX_OVERRUN BIT(6)
+#define USBC_RX_STATUS_RX_CLEAR BIT(0)
+
+#define USBC_PD_STATUS_RX_RSLT(r) ((r >> 3) & 0x7)
+#define USBC_PD_STATUS_TX_RSLT(r) (r & 0x7)
+
+#define USBC_RX_INFO_RXBYTES(r) ((r >> 3) & 0x1f)
+#define USBC_RX_INFO_RX_SOP(r) (r & 0x7)
+
+#define USBC_PD_RX_BUF_LEN 30
+#define USBC_PD_TX_BUF_LEN 30
+
struct wcove_typec {
+ int pd_port_num;
struct mutex lock; /* device lock */
struct device *dev;
struct regmap *regmap;
struct typec_port *port;
+ struct pd_sink_port pd_port;
+ struct completion complete;
struct typec_capability cap;
struct typec_connection con;
struct typec_partner partner;
@@ -106,6 +154,50 @@ enum wcove_typec_role {
WCOVE_ROLE_DEVICE,
};

+static struct sink_ps profiles[] = {
+
+ {
+ .ps_type = PS_TYPE_FIXED,
+ .ps_fixed = {
+ .voltage_fixed = 100, /* 5V/50mV = 100 */
+ .current_default = 90, /* 900mA/10mA = 90 */
+ .current_max = 90, /* 900mA/10mA = 90 */
+ },
+
+ },
+
+ {
+ .ps_type = PS_TYPE_FIXED,
+ .ps_fixed = {
+ .voltage_fixed = 100,
+ .current_default = 300,
+ .current_max = 300,
+ },
+ },
+
+ {
+ .ps_type = PS_TYPE_FIXED,
+ .ps_fixed = {
+ .voltage_fixed = 240,
+ .current_default = 300,
+ .current_max = 300,
+ },
+ },
+
+};
+
+static struct pd_sink_profile profile = {
+ .hw_goodcrc_tx = true,
+ .hw_goodcrc_rx = true,
+ .gotomin = true,
+ .usb_comm = true,
+ .spec = USB_SPEC_3X,
+ .pd_rev = PD_REVISION_2,
+ .ps = profiles,
+ .nr_ps = ARRAY_SIZE(profiles),
+ .active_ps = 2, /* voltage = 5V, current = 3A */
+};
+
static uuid_le uuid = UUID_LE(0x482383f0, 0x2876, 0x4e49,
0x86, 0x85, 0xdb, 0x66, 0x21, 0x1a, 0xf0, 0x37);

@@ -140,7 +232,111 @@ static void wcove_typec_device_mode(struct wcove_typec *wcove)
typec_connect(wcove->port, &wcove->con);
}

-static irqreturn_t wcove_typec_irq(int irq, void *data)
+static int wcove_typec_pd_recv_pkt_handler(struct wcove_typec *wcove)
+{
+ unsigned int rx_status;
+ unsigned int rx_info;
+ unsigned int temp;
+ int len;
+ int ret, i;
+ struct pd_sink_msg *msg;
+ char buf[USBC_PD_RX_BUF_LEN];
+
+ ret = regmap_read(wcove->regmap, USBC_RX_STATUS, &rx_status);
+ if (ret)
+ goto err;
+
+ while (rx_status & USBC_RX_STATUS_RX_DATA) {
+ ret = regmap_read(wcove->regmap, USBC_RX_INFO, &rx_info);
+ if (ret)
+ goto err;
+
+ len = (USBC_RX_INFO_RXBYTES(rx_info));
+
+ for (i = 0; i < len; i++) {
+ ret = regmap_read(wcove->regmap, USBC_RX_DATA_START + i,
+ &temp);
+ buf[i] = (char)temp;
+ if (ret)
+ goto err;
+ }
+
+ msg = pd_sink_alloc_msg(wcove->pd_port_num, len);
+ memcpy(msg->buf, buf, len);
+
+ switch (USBC_RX_INFO_RX_SOP(rx_info)) {
+ case SOP:
+ msg->sop_type = SOP;
+ break;
+ case SOP_P:
+ msg->sop_type = SOP_P;
+ break;
+ case SOP_PP:
+ msg->sop_type = SOP_PP;
+ break;
+ default:
+ pr_warn("Packet type not supported\n");
+ }
+
+ pd_sink_queue_msg(msg);
+
+ /* Clear RX status */
+ regmap_update_bits(wcove->regmap, USBC_RX_STATUS,
+ USBC_RX_STATUS_RX_CLEAR, USBC_RX_STATUS_RX_CLEAR);
+
+ ret = regmap_read(wcove->regmap, USBC_RX_STATUS, &rx_status);
+ if (ret)
+ goto err;
+ }
+
+ return 0;
+
+err:
+ return ret;
+}
+
+static int wcove_typec_pd_tx_pkt_handler(int port_num, void *data,
+ void *buf, int len, enum sop_type pkt_type)
+{
+ unsigned int tx_cmd;
+ unsigned int val;
+ int ret, i;
+ char *buf1 = buf;
+ struct wcove_typec *wcove = data;
+
+ ret = regmap_read(wcove->regmap, USBC_TX_CMD, &tx_cmd);
+ if (ret)
+ goto err;
+
+ if (!(tx_cmd & USBC_TX_CMD_TXBUF_RDY))
+ return -EBUSY;
+
+ for (i = 0; i < len; i++)
+ ret = regmap_write(wcove->regmap, USBC_TX_DATA_START + i,
+ buf1[i]);
+ if (ret)
+ goto err;
+
+ regmap_read(wcove->regmap, USBC_TX_INFO, &val);
+ ret = regmap_write(wcove->regmap, USBC_TX_INFO, 0x71);
+ if (ret)
+ goto err;
+
+ ret = regmap_write(wcove->regmap, USBC_TX_CMD,
+ USBC_TX_CMD_TX_START | (1 << 5));
+ if (ret)
+ goto err;
+
+ ret = regmap_read(wcove->regmap, USBC_TX_CMD, &tx_cmd);
+ if (ret)
+ goto err;
+
+err:
+ kfree(buf1);
+ return ret;
+}
+
+static irqreturn_t wcove_typec_irq(int irq, void *data)
{
struct wcove_typec *wcove = data;
unsigned int cc1_ctrl;
@@ -149,10 +345,10 @@ static irqreturn_t wcove_typec_irq(int irq, void *data)
unsigned int cc_irq2;
unsigned int status1;
unsigned int status2;
+ unsigned int rx_status;
int ret;

mutex_lock(&wcove->lock);
-
ret = regmap_read(wcove->regmap, USBC_IRQ1, &cc_irq1);
if (ret)
goto err;
@@ -177,6 +373,10 @@ static irqreturn_t wcove_typec_irq(int irq, void *data)
if (ret)
goto err;

+ ret = regmap_read(wcove->regmap, USBC_RX_STATUS, &rx_status);
+ if (ret)
+ goto err;
+
if (cc_irq1) {
if (cc_irq1 & USBC_IRQ1_OVERTEMP)
dev_err(wcove->dev, "VCONN Switch Over Temperature!\n");
@@ -185,18 +385,6 @@ static irqreturn_t wcove_typec_irq(int irq, void *data)
regmap_write(wcove->regmap, USBC_IRQ1, cc_irq1);
}

- if (cc_irq2) {
- regmap_write(wcove->regmap, USBC_IRQ2, cc_irq2);
- /*
- * Ingoring any PD communication interrupts until the PD stack
- * is in place
- */
- if (cc_irq2 & ~USBC_IRQ2_CC_CHANGE) {
- dev_WARN(wcove->dev, "USB PD handling missing\n");
- goto err;
- }
- }
-
if (status1 & USBC_STATUS1_DET_ONGOING)
goto out;

@@ -211,24 +399,51 @@ static irqreturn_t wcove_typec_irq(int irq, void *data)
WCOVE_ORIENTATION_NORMAL);
/* Host mode by default */
wcove_typec_func(wcove, WCOVE_FUNC_ROLE, WCOVE_ROLE_HOST);
- goto out;
- }

- if (wcove->con.partner)
+ /* reset the pd sink state */
+ if (wcove->pd_port_num >= 0)
+ pd_sink_reset_state(wcove->pd_port_num);
+
goto out;
+ }

switch (USBC_STATUS1_ORIENT(status1)) {
case USBC_ORIENT_NORMAL:
wcove_typec_func(wcove, WCOVE_FUNC_ORIENTATION,
WCOVE_ORIENTATION_NORMAL);
+ regmap_update_bits(wcove->regmap, USBC_CC_SEL,
+ USBC_CC_SEL_CCSEL, 0x1);
break;
case USBC_ORIENT_REVERSE:
wcove_typec_func(wcove, WCOVE_FUNC_ORIENTATION,
WCOVE_ORIENTATION_REVERSE);
+ regmap_update_bits(wcove->regmap, USBC_CC_SEL,
+ USBC_CC_SEL_CCSEL, 0x2);
default:
break;
}

+ if (cc_irq2 & USBC_IRQ2_RX_PD ||
+ rx_status & USBC_RX_STATUS_RX_DATA)
+ wcove_typec_pd_recv_pkt_handler(wcove);
+
+ if (cc_irq2 & USBC_IRQ2_RX_HR)
+ pr_debug("RX HR not implemented\n");
+
+ if (cc_irq2 & USBC_IRQ2_RX_CR)
+ pr_debug("RX CR not implemented\n");
+
+ if (cc_irq2 & USBC_IRQ2_TX_SUCCESS) {
+ pd_sink_tx_complete(wcove->pd_port_num);
+ pr_debug("TX_SENT\n");
+ }
+
+ if (cc_irq2 & USBC_IRQ2_TX_FAIL)
+ pr_debug("TX_FAIL\n");
+
+ if (wcove->con.partner)
+ goto out;
+
switch (USBC_STATUS1_RSLT(status1)) {
case USBC_RSLT_SRC_DEFAULT:
wcove->con.pwr_opmode = TYPEC_PWR_MODE_USB;
@@ -267,6 +482,9 @@ static irqreturn_t wcove_typec_irq(int irq, void *data)
dev_WARN(wcove->dev, "%s Undefined result\n", __func__);
goto err;
}
+
+ if (!completion_done(&wcove->complete))
+ complete(&wcove->complete);
out:
/* If either CC pins is requesting VCONN, we turn it on */
if ((cc1_ctrl & USBC_CC_CTRL_VCONN_EN) ||
@@ -280,9 +498,12 @@ out:
!!(status2 & USBC_STATUS2_VBUS_REQ));
err:
/* REVISIT: Clear WhiskeyCove CHGR Type-C interrupt */
- regmap_write(wcove->regmap, WCOVE_CHGRIRQ0, BIT(5));
-
+ regmap_write(wcove->regmap, WCOVE_CHGRIRQ0,
+ BIT(5) | BIT(4) | BIT(3) | BIT(0));
+ regmap_write(wcove->regmap, USBC_IRQ1, cc_irq1);
+ regmap_write(wcove->regmap, USBC_IRQ2, cc_irq2);
mutex_unlock(&wcove->lock);
+
return IRQ_HANDLED;
}

@@ -297,6 +518,7 @@ static int wcove_typec_probe(struct platform_device *pdev)
if (!wcove)
return -ENOMEM;

+ init_completion(&wcove->complete);
mutex_init(&wcove->lock);
wcove->dev = &pdev->dev;
wcove->regmap = pmic->regmap;
@@ -307,26 +529,29 @@ static int wcove_typec_probe(struct platform_device *pdev)
return ret;

ret = devm_request_threaded_irq(&pdev->dev, ret, NULL,
- wcove_typec_irq, IRQF_ONESHOT,
+ wcove_typec_irq, IRQF_ONESHOT,
"wcove_typec", wcove);
if (ret)
return ret;

wcove->cap.type = TYPEC_PORT_DRP;
-
wcove->port = typec_register_port(&pdev->dev, &wcove->cap);
if (IS_ERR(wcove->port))
return PTR_ERR(wcove->port);

+ /* PD receive packet handler */
+ wcove->pd_port_num = pd_sink_register_port(&profile,
+ wcove_typec_pd_tx_pkt_handler, wcove);
+ if (wcove->pd_port_num) {
+ pr_err("Register pd sink port failed\n");
+ return -EIO;
+ }
+
if (!acpi_check_dsm(ACPI_HANDLE(&pdev->dev), uuid.b, 0, 0x1f)) {
dev_err(&pdev->dev, "Missing _DSM functions\n");
return -ENODEV;
}

- /* Make sure the PD PHY is disabled until PD stack is ready */
- regmap_read(wcove->regmap, USBC_CONTROL3, &val);
- regmap_write(wcove->regmap, USBC_CONTROL3, val | USBC_CONTROL3_PD_DIS);
-
/* DRP mode without accessory support */
regmap_read(wcove->regmap, USBC_CONTROL1, &val);
regmap_write(wcove->regmap, USBC_CONTROL1, USBC_CONTROL1_MODE_DRP(val));
@@ -337,6 +562,17 @@ static int wcove_typec_probe(struct platform_device *pdev)
regmap_read(wcove->regmap, USBC_IRQMASK2, &val);
regmap_write(wcove->regmap, USBC_IRQMASK2, val & ~USBC_IRQMASK2_ALL);

+ /*Set HW control the ID of outgoing messages*/
+ regmap_write(wcove->regmap, USBC_PD_CFG1, BIT(7));
+
+ /* Enable SOP messages for now */
+ regmap_write(wcove->regmap, USBC_PD_CFG2, BIT(0));
+
+ /*Set the PD revision */
+ regmap_read(wcove->regmap, USBC_PD_CFG3, &val);
+ val = 0x14;
+ regmap_write(wcove->regmap, USBC_PD_CFG3, val);
+
platform_set_drvdata(pdev, wcove);
return 0;
}
@@ -353,6 +589,7 @@ static int wcove_typec_remove(struct platform_device *pdev)
regmap_write(wcove->regmap, USBC_IRQMASK2, val | USBC_IRQMASK2_ALL);

typec_unregister_port(wcove->port);
+ pd_sink_unregister_port(wcove->pd_port_num);
return 0;
}

--
1.9.1

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