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Qualcomm ARM Based SoC Updates for 4.3
* Add SMEM driver * Add SMD driver * Add RPM over SMD driver * Select QCOM_SCM by default -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.11 (GNU/Linux) iQIcBAABAgAGBQJVuSZxAAoJEFKiBbHx2RXVtmsP/i7em4uhfDnj7cwoJ0pYbCRx ZkbuBFPC6OdUut9Lq7Wj9b9/cGtZIKhDptyvVic0eWE26u39o2JctnqKQ2bw/uu/ MwhTWBll6jPguY4Xb8kM0dbccPkq2vKWLu1VWwqeW4VhlB7QYYLOKaNELhW3nfPv y5q9qp+ykko0I7VUXNRSxI3kzbIhDKNaKlS4KupTdLRA6d7xl8PAc9O6/qEZAcK0 S7vBlpvsAyLiGXW35bg6Oi+mGOqgfFFi1z4L9oW1UgXeMcslJ5EBWg4CvJMjb48y PTSlMZ+2QZTbJj7fcc7Sj/FgKrWXiFpcsxfXaSdeywlIQvvZcPAf6vuXTVHcHx32 0AoWpsm9vW0N1tWtstoj0Lvs2A8ewQxkQyflYX+J1G0+JCZ22PbPiG7lUAVLV17u fTOAPp2Vcw/5v5jnpAzECp5CH9SGUuv/3yfwoN7spb+ODOOWqzYGFRCnycTTeuxo QYkjrUr4i/fbPsJiK3TZalZzm7X6ZI3Y1FZyiCGN/1b8XmZm7PfSB7Uf/YLFbQXM WuEepT3GoR17SMyApN09uV0kJXA+TSFBpY5A89QgfzjkBbOyK+dsZ3GnUuoWyjof G/swXEVzk7SX8LBXwBg7/BIHVWVARiedTLzvn383C/7BShO9ME/pdGHaYAjVHq8r BCTszTpelZ9p1qkI5hlN =ic0y -----END PGP SIGNATURE----- Merge tag 'qcom-soc-for-4.3' of git://codeaurora.org/quic/kernel/agross-msm into next/drivers Qualcomm ARM Based SoC Updates for 4.3 * Add SMEM driver * Add SMD driver * Add RPM over SMD driver * Select QCOM_SCM by default * tag 'qcom-soc-for-4.3' of git://codeaurora.org/quic/kernel/agross-msm: devicetree: soc: Add Qualcomm SMD based RPM DT binding soc: qcom: Driver for the Qualcomm RPM over SMD soc: qcom: Add Shared Memory Driver soc: qcom: Add device tree binding for Shared Memory Device drivers: qcom: Select QCOM_SCM unconditionally for QCOM_PM soc: qcom: Add Shared Memory Manager driver Signed-off-by: Olof Johansson <[email protected]>
This commit is contained in:
Olof Johansson
commit
0bf413558e
10 changed files with 2660 additions and 0 deletions
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@ -13,7 +13,38 @@ config QCOM_GSBI
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config QCOM_PM
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bool "Qualcomm Power Management"
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depends on ARCH_QCOM && !ARM64
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select QCOM_SCM
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help
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QCOM Platform specific power driver to manage cores and L2 low power
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modes. It interface with various system drivers to put the cores in
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low power modes.
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config QCOM_SMD
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tristate "Qualcomm Shared Memory Driver (SMD)"
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depends on QCOM_SMEM
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help
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Say y here to enable support for the Qualcomm Shared Memory Driver
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providing communication channels to remote processors in Qualcomm
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platforms.
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config QCOM_SMD_RPM
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tristate "Qualcomm Resource Power Manager (RPM) over SMD"
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depends on QCOM_SMD && OF
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help
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If you say yes to this option, support will be included for the
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Resource Power Manager system found in the Qualcomm 8974 based
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devices.
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This is required to access many regulators, clocks and bus
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frequencies controlled by the RPM on these devices.
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Say M here if you want to include support for the Qualcomm RPM as a
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module. This will build a module called "qcom-smd-rpm".
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config QCOM_SMEM
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tristate "Qualcomm Shared Memory Manager (SMEM)"
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depends on ARCH_QCOM
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help
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Say y here to enable support for the Qualcomm Shared Memory Manager.
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The driver provides an interface to items in a heap shared among all
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processors in a Qualcomm platform.
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@ -1,2 +1,5 @@
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obj-$(CONFIG_QCOM_GSBI) += qcom_gsbi.o
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obj-$(CONFIG_QCOM_PM) += spm.o
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obj-$(CONFIG_QCOM_SMD) += smd.o
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obj-$(CONFIG_QCOM_SMD_RPM) += smd-rpm.o
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obj-$(CONFIG_QCOM_SMEM) += smem.o
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244
drivers/soc/qcom/smd-rpm.c
Normal file
244
drivers/soc/qcom/smd-rpm.c
Normal file
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@ -0,0 +1,244 @@
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/*
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* Copyright (c) 2015, Sony Mobile Communications AB.
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* Copyright (c) 2012-2013, The Linux Foundation. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 and
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* only version 2 as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#include <linux/module.h>
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#include <linux/platform_device.h>
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#include <linux/of_platform.h>
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#include <linux/io.h>
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#include <linux/interrupt.h>
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#include <linux/soc/qcom/smd.h>
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#include <linux/soc/qcom/smd-rpm.h>
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#define RPM_REQUEST_TIMEOUT (5 * HZ)
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/**
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* struct qcom_smd_rpm - state of the rpm device driver
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* @rpm_channel: reference to the smd channel
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* @ack: completion for acks
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* @lock: mutual exclusion around the send/complete pair
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* @ack_status: result of the rpm request
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*/
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struct qcom_smd_rpm {
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struct qcom_smd_channel *rpm_channel;
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struct completion ack;
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struct mutex lock;
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int ack_status;
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};
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/**
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* struct qcom_rpm_header - header for all rpm requests and responses
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* @service_type: identifier of the service
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* @length: length of the payload
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*/
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struct qcom_rpm_header {
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u32 service_type;
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u32 length;
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};
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/**
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* struct qcom_rpm_request - request message to the rpm
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* @msg_id: identifier of the outgoing message
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* @flags: active/sleep state flags
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* @type: resource type
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* @id: resource id
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* @data_len: length of the payload following this header
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*/
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struct qcom_rpm_request {
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u32 msg_id;
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u32 flags;
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u32 type;
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u32 id;
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u32 data_len;
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};
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/**
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* struct qcom_rpm_message - response message from the rpm
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* @msg_type: indicator of the type of message
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* @length: the size of this message, including the message header
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* @msg_id: message id
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* @message: textual message from the rpm
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*
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* Multiple of these messages can be stacked in an rpm message.
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*/
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struct qcom_rpm_message {
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u32 msg_type;
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u32 length;
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union {
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u32 msg_id;
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u8 message[0];
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};
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};
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#define RPM_SERVICE_TYPE_REQUEST 0x00716572 /* "req\0" */
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#define RPM_MSG_TYPE_ERR 0x00727265 /* "err\0" */
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#define RPM_MSG_TYPE_MSG_ID 0x2367736d /* "msg#" */
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/**
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* qcom_rpm_smd_write - write @buf to @type:@id
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* @rpm: rpm handle
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* @type: resource type
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* @id: resource identifier
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* @buf: the data to be written
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* @count: number of bytes in @buf
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*/
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int qcom_rpm_smd_write(struct qcom_smd_rpm *rpm,
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int state,
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u32 type, u32 id,
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void *buf,
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size_t count)
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{
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static unsigned msg_id = 1;
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int left;
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int ret;
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struct {
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struct qcom_rpm_header hdr;
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struct qcom_rpm_request req;
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u8 payload[count];
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} pkt;
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/* SMD packets to the RPM may not exceed 256 bytes */
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if (WARN_ON(sizeof(pkt) >= 256))
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return -EINVAL;
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mutex_lock(&rpm->lock);
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pkt.hdr.service_type = RPM_SERVICE_TYPE_REQUEST;
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pkt.hdr.length = sizeof(struct qcom_rpm_request) + count;
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pkt.req.msg_id = msg_id++;
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pkt.req.flags = BIT(state);
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pkt.req.type = type;
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pkt.req.id = id;
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pkt.req.data_len = count;
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memcpy(pkt.payload, buf, count);
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ret = qcom_smd_send(rpm->rpm_channel, &pkt, sizeof(pkt));
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if (ret)
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goto out;
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left = wait_for_completion_timeout(&rpm->ack, RPM_REQUEST_TIMEOUT);
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if (!left)
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ret = -ETIMEDOUT;
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else
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ret = rpm->ack_status;
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out:
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mutex_unlock(&rpm->lock);
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return ret;
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}
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EXPORT_SYMBOL(qcom_rpm_smd_write);
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static int qcom_smd_rpm_callback(struct qcom_smd_device *qsdev,
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const void *data,
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size_t count)
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{
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const struct qcom_rpm_header *hdr = data;
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const struct qcom_rpm_message *msg;
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struct qcom_smd_rpm *rpm = dev_get_drvdata(&qsdev->dev);
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const u8 *buf = data + sizeof(struct qcom_rpm_header);
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const u8 *end = buf + hdr->length;
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char msgbuf[32];
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int status = 0;
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u32 len;
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if (hdr->service_type != RPM_SERVICE_TYPE_REQUEST ||
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hdr->length < sizeof(struct qcom_rpm_message)) {
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dev_err(&qsdev->dev, "invalid request\n");
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return 0;
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}
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while (buf < end) {
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msg = (struct qcom_rpm_message *)buf;
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switch (msg->msg_type) {
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case RPM_MSG_TYPE_MSG_ID:
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break;
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case RPM_MSG_TYPE_ERR:
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len = min_t(u32, ALIGN(msg->length, 4), sizeof(msgbuf));
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memcpy_fromio(msgbuf, msg->message, len);
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msgbuf[len - 1] = 0;
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if (!strcmp(msgbuf, "resource does not exist"))
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status = -ENXIO;
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else
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status = -EINVAL;
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break;
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}
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buf = PTR_ALIGN(buf + 2 * sizeof(u32) + msg->length, 4);
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}
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rpm->ack_status = status;
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complete(&rpm->ack);
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return 0;
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}
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static int qcom_smd_rpm_probe(struct qcom_smd_device *sdev)
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{
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struct qcom_smd_rpm *rpm;
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rpm = devm_kzalloc(&sdev->dev, sizeof(*rpm), GFP_KERNEL);
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if (!rpm)
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return -ENOMEM;
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mutex_init(&rpm->lock);
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init_completion(&rpm->ack);
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rpm->rpm_channel = sdev->channel;
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dev_set_drvdata(&sdev->dev, rpm);
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return of_platform_populate(sdev->dev.of_node, NULL, NULL, &sdev->dev);
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}
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static void qcom_smd_rpm_remove(struct qcom_smd_device *sdev)
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{
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of_platform_depopulate(&sdev->dev);
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}
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static const struct of_device_id qcom_smd_rpm_of_match[] = {
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{ .compatible = "qcom,rpm-msm8974" },
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{}
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};
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MODULE_DEVICE_TABLE(of, qcom_smd_rpm_of_match);
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static struct qcom_smd_driver qcom_smd_rpm_driver = {
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.probe = qcom_smd_rpm_probe,
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.remove = qcom_smd_rpm_remove,
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.callback = qcom_smd_rpm_callback,
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.driver = {
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.name = "qcom_smd_rpm",
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.owner = THIS_MODULE,
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.of_match_table = qcom_smd_rpm_of_match,
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},
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};
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static int __init qcom_smd_rpm_init(void)
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{
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return qcom_smd_driver_register(&qcom_smd_rpm_driver);
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}
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arch_initcall(qcom_smd_rpm_init);
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static void __exit qcom_smd_rpm_exit(void)
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{
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qcom_smd_driver_unregister(&qcom_smd_rpm_driver);
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}
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module_exit(qcom_smd_rpm_exit);
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MODULE_AUTHOR("Bjorn Andersson <[email protected]>");
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MODULE_DESCRIPTION("Qualcomm SMD backed RPM driver");
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MODULE_LICENSE("GPL v2");
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1319
drivers/soc/qcom/smd.c
Normal file
1319
drivers/soc/qcom/smd.c
Normal file
File diff suppressed because it is too large
Load diff
775
drivers/soc/qcom/smem.c
Normal file
775
drivers/soc/qcom/smem.c
Normal file
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@ -0,0 +1,775 @@
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/*
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* Copyright (c) 2015, Sony Mobile Communications AB.
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* Copyright (c) 2012-2013, The Linux Foundation. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 and
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* only version 2 as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#include <linux/hwspinlock.h>
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#include <linux/io.h>
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#include <linux/module.h>
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#include <linux/of.h>
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#include <linux/of_address.h>
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#include <linux/platform_device.h>
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#include <linux/slab.h>
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#include <linux/soc/qcom/smem.h>
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/*
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* The Qualcomm shared memory system is a allocate only heap structure that
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* consists of one of more memory areas that can be accessed by the processors
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* in the SoC.
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*
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* All systems contains a global heap, accessible by all processors in the SoC,
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* with a table of contents data structure (@smem_header) at the beginning of
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* the main shared memory block.
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*
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* The global header contains meta data for allocations as well as a fixed list
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* of 512 entries (@smem_global_entry) that can be initialized to reference
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* parts of the shared memory space.
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*
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*
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* In addition to this global heap a set of "private" heaps can be set up at
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* boot time with access restrictions so that only certain processor pairs can
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* access the data.
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*
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* These partitions are referenced from an optional partition table
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* (@smem_ptable), that is found 4kB from the end of the main smem region. The
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* partition table entries (@smem_ptable_entry) lists the involved processors
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* (or hosts) and their location in the main shared memory region.
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*
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* Each partition starts with a header (@smem_partition_header) that identifies
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* the partition and holds properties for the two internal memory regions. The
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* two regions are cached and non-cached memory respectively. Each region
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* contain a link list of allocation headers (@smem_private_entry) followed by
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* their data.
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*
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* Items in the non-cached region are allocated from the start of the partition
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* while items in the cached region are allocated from the end. The free area
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* is hence the region between the cached and non-cached offsets.
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*
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*
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* To synchronize allocations in the shared memory heaps a remote spinlock must
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* be held - currently lock number 3 of the sfpb or tcsr is used for this on all
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* platforms.
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*
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*/
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/*
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* Item 3 of the global heap contains an array of versions for the various
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* software components in the SoC. We verify that the boot loader version is
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* what the expected version (SMEM_EXPECTED_VERSION) as a sanity check.
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*/
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#define SMEM_ITEM_VERSION 3
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#define SMEM_MASTER_SBL_VERSION_INDEX 7
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#define SMEM_EXPECTED_VERSION 11
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/*
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||||
* The first 8 items are only to be allocated by the boot loader while
|
||||
* initializing the heap.
|
||||
*/
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#define SMEM_ITEM_LAST_FIXED 8
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/* Highest accepted item number, for both global and private heaps */
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#define SMEM_ITEM_COUNT 512
|
||||
|
||||
/* Processor/host identifier for the application processor */
|
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#define SMEM_HOST_APPS 0
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|
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/* Max number of processors/hosts in a system */
|
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#define SMEM_HOST_COUNT 9
|
||||
|
||||
/**
|
||||
* struct smem_proc_comm - proc_comm communication struct (legacy)
|
||||
* @command: current command to be executed
|
||||
* @status: status of the currently requested command
|
||||
* @params: parameters to the command
|
||||
*/
|
||||
struct smem_proc_comm {
|
||||
u32 command;
|
||||
u32 status;
|
||||
u32 params[2];
|
||||
};
|
||||
|
||||
/**
|
||||
* struct smem_global_entry - entry to reference smem items on the heap
|
||||
* @allocated: boolean to indicate if this entry is used
|
||||
* @offset: offset to the allocated space
|
||||
* @size: size of the allocated space, 8 byte aligned
|
||||
* @aux_base: base address for the memory region used by this unit, or 0 for
|
||||
* the default region. bits 0,1 are reserved
|
||||
*/
|
||||
struct smem_global_entry {
|
||||
u32 allocated;
|
||||
u32 offset;
|
||||
u32 size;
|
||||
u32 aux_base; /* bits 1:0 reserved */
|
||||
};
|
||||
#define AUX_BASE_MASK 0xfffffffc
|
||||
|
||||
/**
|
||||
* struct smem_header - header found in beginning of primary smem region
|
||||
* @proc_comm: proc_comm communication interface (legacy)
|
||||
* @version: array of versions for the various subsystems
|
||||
* @initialized: boolean to indicate that smem is initialized
|
||||
* @free_offset: index of the first unallocated byte in smem
|
||||
* @available: number of bytes available for allocation
|
||||
* @reserved: reserved field, must be 0
|
||||
* toc: array of references to items
|
||||
*/
|
||||
struct smem_header {
|
||||
struct smem_proc_comm proc_comm[4];
|
||||
u32 version[32];
|
||||
u32 initialized;
|
||||
u32 free_offset;
|
||||
u32 available;
|
||||
u32 reserved;
|
||||
struct smem_global_entry toc[SMEM_ITEM_COUNT];
|
||||
};
|
||||
|
||||
/**
|
||||
* struct smem_ptable_entry - one entry in the @smem_ptable list
|
||||
* @offset: offset, within the main shared memory region, of the partition
|
||||
* @size: size of the partition
|
||||
* @flags: flags for the partition (currently unused)
|
||||
* @host0: first processor/host with access to this partition
|
||||
* @host1: second processor/host with access to this partition
|
||||
* @reserved: reserved entries for later use
|
||||
*/
|
||||
struct smem_ptable_entry {
|
||||
u32 offset;
|
||||
u32 size;
|
||||
u32 flags;
|
||||
u16 host0;
|
||||
u16 host1;
|
||||
u32 reserved[8];
|
||||
};
|
||||
|
||||
/**
|
||||
* struct smem_ptable - partition table for the private partitions
|
||||
* @magic: magic number, must be SMEM_PTABLE_MAGIC
|
||||
* @version: version of the partition table
|
||||
* @num_entries: number of partitions in the table
|
||||
* @reserved: for now reserved entries
|
||||
* @entry: list of @smem_ptable_entry for the @num_entries partitions
|
||||
*/
|
||||
struct smem_ptable {
|
||||
u32 magic;
|
||||
u32 version;
|
||||
u32 num_entries;
|
||||
u32 reserved[5];
|
||||
struct smem_ptable_entry entry[];
|
||||
};
|
||||
#define SMEM_PTABLE_MAGIC 0x434f5424 /* "$TOC" */
|
||||
|
||||
/**
|
||||
* struct smem_partition_header - header of the partitions
|
||||
* @magic: magic number, must be SMEM_PART_MAGIC
|
||||
* @host0: first processor/host with access to this partition
|
||||
* @host1: second processor/host with access to this partition
|
||||
* @size: size of the partition
|
||||
* @offset_free_uncached: offset to the first free byte of uncached memory in
|
||||
* this partition
|
||||
* @offset_free_cached: offset to the first free byte of cached memory in this
|
||||
* partition
|
||||
* @reserved: for now reserved entries
|
||||
*/
|
||||
struct smem_partition_header {
|
||||
u32 magic;
|
||||
u16 host0;
|
||||
u16 host1;
|
||||
u32 size;
|
||||
u32 offset_free_uncached;
|
||||
u32 offset_free_cached;
|
||||
u32 reserved[3];
|
||||
};
|
||||
#define SMEM_PART_MAGIC 0x54525024 /* "$PRT" */
|
||||
|
||||
/**
|
||||
* struct smem_private_entry - header of each item in the private partition
|
||||
* @canary: magic number, must be SMEM_PRIVATE_CANARY
|
||||
* @item: identifying number of the smem item
|
||||
* @size: size of the data, including padding bytes
|
||||
* @padding_data: number of bytes of padding of data
|
||||
* @padding_hdr: number of bytes of padding between the header and the data
|
||||
* @reserved: for now reserved entry
|
||||
*/
|
||||
struct smem_private_entry {
|
||||
u16 canary;
|
||||
u16 item;
|
||||
u32 size; /* includes padding bytes */
|
||||
u16 padding_data;
|
||||
u16 padding_hdr;
|
||||
u32 reserved;
|
||||
};
|
||||
#define SMEM_PRIVATE_CANARY 0xa5a5
|
||||
|
||||
/**
|
||||
* struct smem_region - representation of a chunk of memory used for smem
|
||||
* @aux_base: identifier of aux_mem base
|
||||
* @virt_base: virtual base address of memory with this aux_mem identifier
|
||||
* @size: size of the memory region
|
||||
*/
|
||||
struct smem_region {
|
||||
u32 aux_base;
|
||||
void __iomem *virt_base;
|
||||
size_t size;
|
||||
};
|
||||
|
||||
/**
|
||||
* struct qcom_smem - device data for the smem device
|
||||
* @dev: device pointer
|
||||
* @hwlock: reference to a hwspinlock
|
||||
* @partitions: list of pointers to partitions affecting the current
|
||||
* processor/host
|
||||
* @num_regions: number of @regions
|
||||
* @regions: list of the memory regions defining the shared memory
|
||||
*/
|
||||
struct qcom_smem {
|
||||
struct device *dev;
|
||||
|
||||
struct hwspinlock *hwlock;
|
||||
|
||||
struct smem_partition_header *partitions[SMEM_HOST_COUNT];
|
||||
|
||||
unsigned num_regions;
|
||||
struct smem_region regions[0];
|
||||
};
|
||||
|
||||
/* Pointer to the one and only smem handle */
|
||||
static struct qcom_smem *__smem;
|
||||
|
||||
/* Timeout (ms) for the trylock of remote spinlocks */
|
||||
#define HWSPINLOCK_TIMEOUT 1000
|
||||
|
||||
static int qcom_smem_alloc_private(struct qcom_smem *smem,
|
||||
unsigned host,
|
||||
unsigned item,
|
||||
size_t size)
|
||||
{
|
||||
struct smem_partition_header *phdr;
|
||||
struct smem_private_entry *hdr;
|
||||
size_t alloc_size;
|
||||
void *p;
|
||||
|
||||
/* We're not going to find it if there's no matching partition */
|
||||
if (host >= SMEM_HOST_COUNT || !smem->partitions[host])
|
||||
return -ENOENT;
|
||||
|
||||
phdr = smem->partitions[host];
|
||||
|
||||
p = (void *)phdr + sizeof(*phdr);
|
||||
while (p < (void *)phdr + phdr->offset_free_uncached) {
|
||||
hdr = p;
|
||||
|
||||
if (hdr->canary != SMEM_PRIVATE_CANARY) {
|
||||
dev_err(smem->dev,
|
||||
"Found invalid canary in host %d partition\n",
|
||||
host);
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
if (hdr->item == item)
|
||||
return -EEXIST;
|
||||
|
||||
p += sizeof(*hdr) + hdr->padding_hdr + hdr->size;
|
||||
}
|
||||
|
||||
/* Check that we don't grow into the cached region */
|
||||
alloc_size = sizeof(*hdr) + ALIGN(size, 8);
|
||||
if (p + alloc_size >= (void *)phdr + phdr->offset_free_cached) {
|
||||
dev_err(smem->dev, "Out of memory\n");
|
||||
return -ENOSPC;
|
||||
}
|
||||
|
||||
hdr = p;
|
||||
hdr->canary = SMEM_PRIVATE_CANARY;
|
||||
hdr->item = item;
|
||||
hdr->size = ALIGN(size, 8);
|
||||
hdr->padding_data = hdr->size - size;
|
||||
hdr->padding_hdr = 0;
|
||||
|
||||
/*
|
||||
* Ensure the header is written before we advance the free offset, so
|
||||
* that remote processors that does not take the remote spinlock still
|
||||
* gets a consistent view of the linked list.
|
||||
*/
|
||||
wmb();
|
||||
phdr->offset_free_uncached += alloc_size;
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int qcom_smem_alloc_global(struct qcom_smem *smem,
|
||||
unsigned item,
|
||||
size_t size)
|
||||
{
|
||||
struct smem_header *header;
|
||||
struct smem_global_entry *entry;
|
||||
|
||||
if (WARN_ON(item >= SMEM_ITEM_COUNT))
|
||||
return -EINVAL;
|
||||
|
||||
header = smem->regions[0].virt_base;
|
||||
entry = &header->toc[item];
|
||||
if (entry->allocated)
|
||||
return -EEXIST;
|
||||
|
||||
size = ALIGN(size, 8);
|
||||
if (WARN_ON(size > header->available))
|
||||
return -ENOMEM;
|
||||
|
||||
entry->offset = header->free_offset;
|
||||
entry->size = size;
|
||||
|
||||
/*
|
||||
* Ensure the header is consistent before we mark the item allocated,
|
||||
* so that remote processors will get a consistent view of the item
|
||||
* even though they do not take the spinlock on read.
|
||||
*/
|
||||
wmb();
|
||||
entry->allocated = 1;
|
||||
|
||||
header->free_offset += size;
|
||||
header->available -= size;
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
/**
|
||||
* qcom_smem_alloc() - allocate space for a smem item
|
||||
* @host: remote processor id, or -1
|
||||
* @item: smem item handle
|
||||
* @size: number of bytes to be allocated
|
||||
*
|
||||
* Allocate space for a given smem item of size @size, given that the item is
|
||||
* not yet allocated.
|
||||
*/
|
||||
int qcom_smem_alloc(unsigned host, unsigned item, size_t size)
|
||||
{
|
||||
unsigned long flags;
|
||||
int ret;
|
||||
|
||||
if (!__smem)
|
||||
return -EPROBE_DEFER;
|
||||
|
||||
if (item < SMEM_ITEM_LAST_FIXED) {
|
||||
dev_err(__smem->dev,
|
||||
"Rejecting allocation of static entry %d\n", item);
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
ret = hwspin_lock_timeout_irqsave(__smem->hwlock,
|
||||
HWSPINLOCK_TIMEOUT,
|
||||
&flags);
|
||||
if (ret)
|
||||
return ret;
|
||||
|
||||
ret = qcom_smem_alloc_private(__smem, host, item, size);
|
||||
if (ret == -ENOENT)
|
||||
ret = qcom_smem_alloc_global(__smem, item, size);
|
||||
|
||||
hwspin_unlock_irqrestore(__smem->hwlock, &flags);
|
||||
|
||||
return ret;
|
||||
}
|
||||
EXPORT_SYMBOL(qcom_smem_alloc);
|
||||
|
||||
static int qcom_smem_get_global(struct qcom_smem *smem,
|
||||
unsigned item,
|
||||
void **ptr,
|
||||
size_t *size)
|
||||
{
|
||||
struct smem_header *header;
|
||||
struct smem_region *area;
|
||||
struct smem_global_entry *entry;
|
||||
u32 aux_base;
|
||||
unsigned i;
|
||||
|
||||
if (WARN_ON(item >= SMEM_ITEM_COUNT))
|
||||
return -EINVAL;
|
||||
|
||||
header = smem->regions[0].virt_base;
|
||||
entry = &header->toc[item];
|
||||
if (!entry->allocated)
|
||||
return -ENXIO;
|
||||
|
||||
if (ptr != NULL) {
|
||||
aux_base = entry->aux_base & AUX_BASE_MASK;
|
||||
|
||||
for (i = 0; i < smem->num_regions; i++) {
|
||||
area = &smem->regions[i];
|
||||
|
||||
if (area->aux_base == aux_base || !aux_base) {
|
||||
*ptr = area->virt_base + entry->offset;
|
||||
break;
|
||||
}
|
||||
}
|
||||
}
|
||||
if (size != NULL)
|
||||
*size = entry->size;
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int qcom_smem_get_private(struct qcom_smem *smem,
|
||||
unsigned host,
|
||||
unsigned item,
|
||||
void **ptr,
|
||||
size_t *size)
|
||||
{
|
||||
struct smem_partition_header *phdr;
|
||||
struct smem_private_entry *hdr;
|
||||
void *p;
|
||||
|
||||
/* We're not going to find it if there's no matching partition */
|
||||
if (host >= SMEM_HOST_COUNT || !smem->partitions[host])
|
||||
return -ENOENT;
|
||||
|
||||
phdr = smem->partitions[host];
|
||||
|
||||
p = (void *)phdr + sizeof(*phdr);
|
||||
while (p < (void *)phdr + phdr->offset_free_uncached) {
|
||||
hdr = p;
|
||||
|
||||
if (hdr->canary != SMEM_PRIVATE_CANARY) {
|
||||
dev_err(smem->dev,
|
||||
"Found invalid canary in host %d partition\n",
|
||||
host);
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
if (hdr->item == item) {
|
||||
if (ptr != NULL)
|
||||
*ptr = p + sizeof(*hdr) + hdr->padding_hdr;
|
||||
|
||||
if (size != NULL)
|
||||
*size = hdr->size - hdr->padding_data;
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
p += sizeof(*hdr) + hdr->padding_hdr + hdr->size;
|
||||
}
|
||||
|
||||
return -ENOENT;
|
||||
}
|
||||
|
||||
/**
|
||||
* qcom_smem_get() - resolve ptr of size of a smem item
|
||||
* @host: the remote processor, or -1
|
||||
* @item: smem item handle
|
||||
* @ptr: pointer to be filled out with address of the item
|
||||
* @size: pointer to be filled out with size of the item
|
||||
*
|
||||
* Looks up pointer and size of a smem item.
|
||||
*/
|
||||
int qcom_smem_get(unsigned host, unsigned item, void **ptr, size_t *size)
|
||||
{
|
||||
unsigned long flags;
|
||||
int ret;
|
||||
|
||||
if (!__smem)
|
||||
return -EPROBE_DEFER;
|
||||
|
||||
ret = hwspin_lock_timeout_irqsave(__smem->hwlock,
|
||||
HWSPINLOCK_TIMEOUT,
|
||||
&flags);
|
||||
if (ret)
|
||||
return ret;
|
||||
|
||||
ret = qcom_smem_get_private(__smem, host, item, ptr, size);
|
||||
if (ret == -ENOENT)
|
||||
ret = qcom_smem_get_global(__smem, item, ptr, size);
|
||||
|
||||
hwspin_unlock_irqrestore(__smem->hwlock, &flags);
|
||||
return ret;
|
||||
|
||||
}
|
||||
EXPORT_SYMBOL(qcom_smem_get);
|
||||
|
||||
/**
|
||||
* qcom_smem_get_free_space() - retrieve amount of free space in a partition
|
||||
* @host: the remote processor identifying a partition, or -1
|
||||
*
|
||||
* To be used by smem clients as a quick way to determine if any new
|
||||
* allocations has been made.
|
||||
*/
|
||||
int qcom_smem_get_free_space(unsigned host)
|
||||
{
|
||||
struct smem_partition_header *phdr;
|
||||
struct smem_header *header;
|
||||
unsigned ret;
|
||||
|
||||
if (!__smem)
|
||||
return -EPROBE_DEFER;
|
||||
|
||||
if (host < SMEM_HOST_COUNT && __smem->partitions[host]) {
|
||||
phdr = __smem->partitions[host];
|
||||
ret = phdr->offset_free_cached - phdr->offset_free_uncached;
|
||||
} else {
|
||||
header = __smem->regions[0].virt_base;
|
||||
ret = header->available;
|
||||
}
|
||||
|
||||
return ret;
|
||||
}
|
||||
EXPORT_SYMBOL(qcom_smem_get_free_space);
|
||||
|
||||
static int qcom_smem_get_sbl_version(struct qcom_smem *smem)
|
||||
{
|
||||
unsigned *versions;
|
||||
size_t size;
|
||||
int ret;
|
||||
|
||||
ret = qcom_smem_get_global(smem, SMEM_ITEM_VERSION,
|
||||
(void **)&versions, &size);
|
||||
if (ret < 0) {
|
||||
dev_err(smem->dev, "Unable to read the version item\n");
|
||||
return -ENOENT;
|
||||
}
|
||||
|
||||
if (size < sizeof(unsigned) * SMEM_MASTER_SBL_VERSION_INDEX) {
|
||||
dev_err(smem->dev, "Version item is too small\n");
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
return versions[SMEM_MASTER_SBL_VERSION_INDEX];
|
||||
}
|
||||
|
||||
static int qcom_smem_enumerate_partitions(struct qcom_smem *smem,
|
||||
unsigned local_host)
|
||||
{
|
||||
struct smem_partition_header *header;
|
||||
struct smem_ptable_entry *entry;
|
||||
struct smem_ptable *ptable;
|
||||
unsigned remote_host;
|
||||
int i;
|
||||
|
||||
ptable = smem->regions[0].virt_base + smem->regions[0].size - SZ_4K;
|
||||
if (ptable->magic != SMEM_PTABLE_MAGIC)
|
||||
return 0;
|
||||
|
||||
if (ptable->version != 1) {
|
||||
dev_err(smem->dev,
|
||||
"Unsupported partition header version %d\n",
|
||||
ptable->version);
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
for (i = 0; i < ptable->num_entries; i++) {
|
||||
entry = &ptable->entry[i];
|
||||
|
||||
if (entry->host0 != local_host && entry->host1 != local_host)
|
||||
continue;
|
||||
|
||||
if (!entry->offset)
|
||||
continue;
|
||||
|
||||
if (!entry->size)
|
||||
continue;
|
||||
|
||||
if (entry->host0 == local_host)
|
||||
remote_host = entry->host1;
|
||||
else
|
||||
remote_host = entry->host0;
|
||||
|
||||
if (remote_host >= SMEM_HOST_COUNT) {
|
||||
dev_err(smem->dev,
|
||||
"Invalid remote host %d\n",
|
||||
remote_host);
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
if (smem->partitions[remote_host]) {
|
||||
dev_err(smem->dev,
|
||||
"Already found a partition for host %d\n",
|
||||
remote_host);
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
header = smem->regions[0].virt_base + entry->offset;
|
||||
|
||||
if (header->magic != SMEM_PART_MAGIC) {
|
||||
dev_err(smem->dev,
|
||||
"Partition %d has invalid magic\n", i);
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
if (header->host0 != local_host && header->host1 != local_host) {
|
||||
dev_err(smem->dev,
|
||||
"Partition %d hosts are invalid\n", i);
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
if (header->host0 != remote_host && header->host1 != remote_host) {
|
||||
dev_err(smem->dev,
|
||||
"Partition %d hosts are invalid\n", i);
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
if (header->size != entry->size) {
|
||||
dev_err(smem->dev,
|
||||
"Partition %d has invalid size\n", i);
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
if (header->offset_free_uncached > header->size) {
|
||||
dev_err(smem->dev,
|
||||
"Partition %d has invalid free pointer\n", i);
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
smem->partitions[remote_host] = header;
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int qcom_smem_count_mem_regions(struct platform_device *pdev)
|
||||
{
|
||||
struct resource *res;
|
||||
int num_regions = 0;
|
||||
int i;
|
||||
|
||||
for (i = 0; i < pdev->num_resources; i++) {
|
||||
res = &pdev->resource[i];
|
||||
|
||||
if (resource_type(res) == IORESOURCE_MEM)
|
||||
num_regions++;
|
||||
}
|
||||
|
||||
return num_regions;
|
||||
}
|
||||
|
||||
static int qcom_smem_probe(struct platform_device *pdev)
|
||||
{
|
||||
struct smem_header *header;
|
||||
struct device_node *np;
|
||||
struct qcom_smem *smem;
|
||||
struct resource *res;
|
||||
struct resource r;
|
||||
size_t array_size;
|
||||
int num_regions = 0;
|
||||
int hwlock_id;
|
||||
u32 version;
|
||||
int ret;
|
||||
int i;
|
||||
|
||||
num_regions = qcom_smem_count_mem_regions(pdev) + 1;
|
||||
|
||||
array_size = num_regions * sizeof(struct smem_region);
|
||||
smem = devm_kzalloc(&pdev->dev, sizeof(*smem) + array_size, GFP_KERNEL);
|
||||
if (!smem)
|
||||
return -ENOMEM;
|
||||
|
||||
smem->dev = &pdev->dev;
|
||||
smem->num_regions = num_regions;
|
||||
|
||||
np = of_parse_phandle(pdev->dev.of_node, "memory-region", 0);
|
||||
if (!np) {
|
||||
dev_err(&pdev->dev, "No memory-region specified\n");
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
ret = of_address_to_resource(np, 0, &r);
|
||||
of_node_put(np);
|
||||
if (ret)
|
||||
return ret;
|
||||
|
||||
smem->regions[0].aux_base = (u32)r.start;
|
||||
smem->regions[0].size = resource_size(&r);
|
||||
smem->regions[0].virt_base = devm_ioremap_nocache(&pdev->dev,
|
||||
r.start,
|
||||
resource_size(&r));
|
||||
if (!smem->regions[0].virt_base)
|
||||
return -ENOMEM;
|
||||
|
||||
for (i = 1; i < num_regions; i++) {
|
||||
res = platform_get_resource(pdev, IORESOURCE_MEM, i - 1);
|
||||
|
||||
smem->regions[i].aux_base = (u32)res->start;
|
||||
smem->regions[i].size = resource_size(res);
|
||||
smem->regions[i].virt_base = devm_ioremap_nocache(&pdev->dev,
|
||||
res->start,
|
||||
resource_size(res));
|
||||
if (!smem->regions[i].virt_base)
|
||||
return -ENOMEM;
|
||||
}
|
||||
|
||||
header = smem->regions[0].virt_base;
|
||||
if (header->initialized != 1 || header->reserved) {
|
||||
dev_err(&pdev->dev, "SMEM is not initialized by SBL\n");
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
version = qcom_smem_get_sbl_version(smem);
|
||||
if (version >> 16 != SMEM_EXPECTED_VERSION) {
|
||||
dev_err(&pdev->dev, "Unsupported SMEM version 0x%x\n", version);
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
ret = qcom_smem_enumerate_partitions(smem, SMEM_HOST_APPS);
|
||||
if (ret < 0)
|
||||
return ret;
|
||||
|
||||
hwlock_id = of_hwspin_lock_get_id(pdev->dev.of_node, 0);
|
||||
if (hwlock_id < 0) {
|
||||
dev_err(&pdev->dev, "failed to retrieve hwlock\n");
|
||||
return hwlock_id;
|
||||
}
|
||||
|
||||
smem->hwlock = hwspin_lock_request_specific(hwlock_id);
|
||||
if (!smem->hwlock)
|
||||
return -ENXIO;
|
||||
|
||||
__smem = smem;
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int qcom_smem_remove(struct platform_device *pdev)
|
||||
{
|
||||
__smem = NULL;
|
||||
hwspin_lock_free(__smem->hwlock);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static const struct of_device_id qcom_smem_of_match[] = {
|
||||
{ .compatible = "qcom,smem" },
|
||||
{}
|
||||
};
|
||||
MODULE_DEVICE_TABLE(of, qcom_smem_of_match);
|
||||
|
||||
static struct platform_driver qcom_smem_driver = {
|
||||
.probe = qcom_smem_probe,
|
||||
.remove = qcom_smem_remove,
|
||||
.driver = {
|
||||
.name = "qcom-smem",
|
||||
.of_match_table = qcom_smem_of_match,
|
||||
.suppress_bind_attrs = true,
|
||||
},
|
||||
};
|
||||
|
||||
static int __init qcom_smem_init(void)
|
||||
{
|
||||
return platform_driver_register(&qcom_smem_driver);
|
||||
}
|
||||
arch_initcall(qcom_smem_init);
|
||||
|
||||
static void __exit qcom_smem_exit(void)
|
||||
{
|
||||
platform_driver_unregister(&qcom_smem_driver);
|
||||
}
|
||||
module_exit(qcom_smem_exit)
|
||||
|
||||
MODULE_AUTHOR("Bjorn Andersson <[email protected]>");
|
||||
MODULE_DESCRIPTION("Qualcomm Shared Memory Manager");
|
||||
MODULE_LICENSE("GPL v2");
|
||||
Loading…
Reference in a new issue