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Wed, 01 Oct 2025 07:38:14 -0700 (PDT) From: "Markus Schneider-Pargmann (TI.com)" Date: Wed, 01 Oct 2025 16:37:40 +0200 Subject: [PATCH v8 3/3] firmware: ti_sci: Partial-IO support Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20251001-topic-am62-partialio-v6-12-b4-v8-3-76a742605110@baylibre.com> References: <20251001-topic-am62-partialio-v6-12-b4-v8-0-76a742605110@baylibre.com> In-Reply-To: <20251001-topic-am62-partialio-v6-12-b4-v8-0-76a742605110@baylibre.com> To: Nishanth Menon , Tero Kristo , Santosh Shilimkar Cc: Vishal Mahaveer , Kevin Hilman , Dhruva Gole , Sebin Francis , Kendall Willis , Akashdeep Kaur , linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, "Markus Schneider-Pargmann (TI.com)" X-Mailer: b4 0.14.2 X-Developer-Signature: v=1; a=openpgp-sha256; l=7001; i=msp@baylibre.com; h=from:subject:message-id; bh=26F0Bvu56G754C2jeroEex8fImMoz0+Y7BY0qxomFcU=; b=owGbwMvMwCXWejAsc4KoVzDjabUkhoy7Nme6LR9Mm8jepaJtdpuDzyVKLWeh2pQnN1obzItsO rrfftDsKGVhEONikBVTZOlMDE37L7/zWPKiZZth5rAygQxh4OIUgIkcKGRk+MNx876kxQbP6JKW dg2zOX9/8f59tqXEVKR5bnnCfAbZEoZfTLZCGgFqS2xVmiWc7gZvtNmgcjvj3nrxqZt+RDV9903 iAwA= X-Developer-Key: i=msp@baylibre.com; a=openpgp; fpr=BADD88DB889FDC3E8A3D5FE612FA6A01E0A45B41 Add support for Partial-IO poweroff. In Partial-IO pins of a few hardware units can generate system wakeups while DDR memory is not powered resulting in a fresh boot of the system. These hardware units in the SoC are always powered so that some logic can detect pin activity. If the system supports Partial-IO as described in the fw capabilities, a sys_off handler is added. This sys_off handler decides if the poweroff is executed by entering normal poweroff or Partial-IO instead. The decision is made by checking if wakeup is enabled on all devices that may wake up the SoC from Partial-IO. The possible wakeup devices are found by checking which devices reference a "Partial-IO" system state in the list of wakeup-source system states. Only devices that are actually enabled by the user will be considered as an active wakeup source. If none of the wakeup sources is enabled the system will do a normal poweroff. If at least one wakeup source is enabled it will instead send a TI_SCI_MSG_PREPARE_SLEEP message from the sys_off handler. Sending this message will result in an immediate shutdown of the system. No execution is expected after this point. The code will wait for 5s and do an emergency_restart afterwards if Partial-IO wasn't entered at that point. A short documentation about Partial-IO can be found in section 6.2.4.5 of the TRM at https://www.ti.com/lit/pdf/spruiv7 Signed-off-by: Markus Schneider-Pargmann (TI.com) --- drivers/firmware/ti_sci.c | 132 ++++++++++++++++++++++++++++++++++++++++++= +++- drivers/firmware/ti_sci.h | 5 ++ 2 files changed, 136 insertions(+), 1 deletion(-) diff --git a/drivers/firmware/ti_sci.c b/drivers/firmware/ti_sci.c index 4db84a92a517b0aa7bb8d47e809d9848a16e2cc4..f2922fccfbe748a436cb9aa0a8c= 8e5f48db02ef9 100644 --- a/drivers/firmware/ti_sci.c +++ b/drivers/firmware/ti_sci.c @@ -6,6 +6,7 @@ * Nishanth Menon */ =20 +#include "linux/dev_printk.h" #define pr_fmt(fmt) "%s: " fmt, __func__ =20 #include @@ -3663,6 +3664,116 @@ devm_ti_sci_get_resource(const struct ti_sci_handle= *handle, struct device *dev, } EXPORT_SYMBOL_GPL(devm_ti_sci_get_resource); =20 +/* + * Enter Partial-IO, which disables everything including DDR with only a s= mall + * logic being active for wakeup. + */ +static int ti_sci_enter_partial_io(struct ti_sci_info *info) +{ + struct ti_sci_msg_req_prepare_sleep *req; + struct ti_sci_xfer *xfer; + struct device *dev =3D info->dev; + int ret =3D 0; + + xfer =3D ti_sci_get_one_xfer(info, TI_SCI_MSG_PREPARE_SLEEP, + TI_SCI_FLAG_REQ_GENERIC_NORESPONSE, + sizeof(*req), sizeof(struct ti_sci_msg_hdr)); + if (IS_ERR(xfer)) { + ret =3D PTR_ERR(xfer); + dev_err(dev, "Message alloc failed(%d)\n", ret); + return ret; + } + + req =3D (struct ti_sci_msg_req_prepare_sleep *)xfer->xfer_buf; + req->mode =3D TISCI_MSG_VALUE_SLEEP_MODE_PARTIAL_IO; + req->ctx_lo =3D 0; + req->ctx_hi =3D 0; + req->debug_flags =3D 0; + + ret =3D ti_sci_do_xfer(info, xfer); + if (ret) { + dev_err(dev, "Mbox send fail %d\n", ret); + goto fail; + } + +fail: + ti_sci_put_one_xfer(&info->minfo, xfer); + + return ret; +} + +/* + * Iterate all device nodes that have a wakeup-source property and check i= f one + * of the possible phandles points to a Partial-IO system state. If it + * does resolve the device node to an actual device and check if wakeup is + * enabled. + */ +static bool ti_sci_partial_io_wakeup_enabled(struct ti_sci_info *info) +{ + struct device_node *wakeup_node =3D NULL; + + for_each_node_with_property(wakeup_node, "wakeup-source") { + struct of_phandle_iterator it; + int err; + + of_for_each_phandle(&it, err, wakeup_node, "wakeup-source", NULL, 0) { + struct platform_device *pdev; + bool may_wakeup; + + /* + * Continue if idle-state-name is not off-wake. Return + * value is the index of the string which should be 0 if + * off-wake is present. + */ + if (of_property_match_string(it.node, "idle-state-name", "off-wake")) + continue; + + pdev =3D of_find_device_by_node(wakeup_node); + if (!pdev) + continue; + + may_wakeup =3D device_may_wakeup(&pdev->dev); + put_device(&pdev->dev); + + if (may_wakeup) { + dev_dbg(info->dev, "%pOF identified as wakeup source for Partial-IO\n", + wakeup_node); + of_node_put(it.node); + of_node_put(wakeup_node); + return true; + } + } + } + + return false; +} + +static int ti_sci_sys_off_handler(struct sys_off_data *data) +{ + struct ti_sci_info *info =3D data->cb_data; + bool enter_partial_io =3D ti_sci_partial_io_wakeup_enabled(info); + int ret; + + if (!enter_partial_io) + return NOTIFY_DONE; + + dev_info(info->dev, "Entering Partial-IO because a powered wakeup-enabled= device was found.\n"); + + ret =3D ti_sci_enter_partial_io(info); + + if (ret) { + dev_err(info->dev, + "Failed to enter Partial-IO %pe, trying to do an emergency restart\n", + ERR_PTR(ret)); + emergency_restart(); + } + + mdelay(5000); + emergency_restart(); + + return NOTIFY_DONE; +} + static int tisci_reboot_handler(struct sys_off_data *data) { struct ti_sci_info *info =3D data->cb_data; @@ -3941,6 +4052,19 @@ static int ti_sci_probe(struct platform_device *pdev) goto out; } =20 + if (info->fw_caps & MSG_FLAG_CAPS_LPM_PARTIAL_IO) { + ret =3D devm_register_sys_off_handler(dev, + SYS_OFF_MODE_POWER_OFF, + SYS_OFF_PRIO_FIRMWARE, + ti_sci_sys_off_handler, + info); + if (ret) { + dev_err(dev, "Failed to register sys_off_handler %pe\n", + ERR_PTR(ret)); + goto out; + } + } + dev_info(dev, "ABI: %d.%d (firmware rev 0x%04x '%s')\n", info->handle.version.abi_major, info->handle.version.abi_minor, info->handle.version.firmware_revision, @@ -3950,7 +4074,13 @@ static int ti_sci_probe(struct platform_device *pdev) list_add_tail(&info->node, &ti_sci_list); mutex_unlock(&ti_sci_list_mutex); =20 - return of_platform_populate(dev->of_node, NULL, NULL, dev); + ret =3D of_platform_populate(dev->of_node, NULL, NULL, dev); + if (ret) { + dev_err(dev, "platform_populate failed %pe\n", ERR_PTR(ret)); + goto out; + } + return 0; + out: if (!IS_ERR(info->chan_tx)) mbox_free_channel(info->chan_tx); diff --git a/drivers/firmware/ti_sci.h b/drivers/firmware/ti_sci.h index 701c416b2e78f8ef20ce6741a88ffa6fd4853b2d..09eaea54dd5cabce72dd1652c96= 03e3ab446b60c 100644 --- a/drivers/firmware/ti_sci.h +++ b/drivers/firmware/ti_sci.h @@ -595,6 +595,11 @@ struct ti_sci_msg_resp_get_clock_freq { struct ti_sci_msg_req_prepare_sleep { struct ti_sci_msg_hdr hdr; =20 +/* + * When sending prepare_sleep with MODE_PARTIAL_IO no response will be sen= t, + * no further steps are required. + */ +#define TISCI_MSG_VALUE_SLEEP_MODE_PARTIAL_IO 0x03 #define TISCI_MSG_VALUE_SLEEP_MODE_DM_MANAGED 0xfd u8 mode; u32 ctx_lo; --=20 2.51.0