From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Google-Smtp-Source: AG47ELuO1jpRJWR+2otCAOwmKiiAT/ottBeoxkTzBeth+hCwx1IBnPwmEd2I8WTCx6M77OpK+I0R ARC-Seal: i=1; a=rsa-sha256; t=1520333309; cv=none; d=google.com; s=arc-20160816; b=lQO+s1ZIVTQEhjwcBgNnb6BmYLtc6yHjrm9qtkpPR1Qv94BWKbCJlPIAaXAWipLSR7 VwwuRgP7rhP5MeM5ZJ2yH0b6QHrQleNWZhgoHK6JFLps8xfQBjLvczjSTCNl+YgHdy6N tsPoGDSo4T+Qybc3CtWtuPbBBa//PdIz7OyHKtlFpFPfPr9JKworWx71bJec/Otiyub+ bG57PE+eIiP3lG6RZ14q/SMm7QSGFTE6Xrt9WBfJuhILIF7QBSBL7fXh8qr8Nwfps1yM TXZw1YlTE2unWkJHYQuda1MWMSnW0ILCXbE7lfyV+9kD7iBqdYHAE/rBngchJJ5J0jAY Nr3Q== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=mime-version:references:in-reply-to:message-id:date:subject:cc:to :from:arc-authentication-results; bh=u5tlPEl92qBaHHaVFmr0JXx5hr8xJngcDkNjXZTR7aY=; b=LD8Wvkinvu5+Bu92w4/PYQ2yPLWYRgxSCUe3BcRLqE0xzUlYEPdxMSi8cr5H7OQu4P FYhe1ituCutrn9IRltVoo9bjD7cOlexHKaTNsDAXLjQvxF3nmBA5uwG7c0QNuPzYmbux B+6wTq/6bTei/WmBZ8b+SZRnxWqNtdBUJahfKUxtsQZ0/2XQngI+ZvvzEW4nUYuLesLd eNZ8btYNd7ENREU5mXs3YvgMe9ExB7OPSKFaZZi0LSSafEt+MLrGPVrvNIHD5MS6xQgk mSnMxGhqOUpWl3haWdQPh7g8keX2FzKn7D6FA8F43bqbw1h0D5x3XsgkVslMMzzR0ajo iatQ== ARC-Authentication-Results: i=1; mx.google.com; spf=pass (google.com: domain of john.garry@huawei.com designates 45.249.212.190 as permitted sender) smtp.mailfrom=john.garry@huawei.com Authentication-Results: mx.google.com; spf=pass (google.com: domain of john.garry@huawei.com designates 45.249.212.190 as permitted sender) smtp.mailfrom=john.garry@huawei.com From: John Garry To: , , , , , , , , , , , , , CC: , , , , , , , , , , , , , Subject: [PATCH v16 8/9] HISI LPC: Add ACPI support Date: Tue, 6 Mar 2018 18:47:47 +0800 Message-ID: <1520333268-82754-9-git-send-email-john.garry@huawei.com> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1520333268-82754-1-git-send-email-john.garry@huawei.com> References: <1520333268-82754-1-git-send-email-john.garry@huawei.com> MIME-Version: 1.0 Content-Type: text/plain X-Originating-IP: [10.67.212.75] X-CFilter-Loop: Reflected X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-THRID: =?utf-8?q?1594185020569420960?= X-GMAIL-MSGID: =?utf-8?q?1594185020569420960?= X-Mailing-List: linux-kernel@vger.kernel.org List-ID: Based on the previous patches, this patch supports the LPC host on hip06/hip07 for ACPI FW. It is the responsibility of the LPC host driver to enumerate the child devices, as the ACPI scan code will not enumerate children of "indirect IO" hosts. The ACPI table for the LPC host controller and the child devices is in the following format: Device (LPC0) { Name (_HID, "HISI0191") // HiSi LPC Name (_CRS, ResourceTemplate () { Memory32Fixed (ReadWrite, 0xa01b0000, 0x1000) }) } Device (LPC0.IPMI) { Name (_HID, "IPI0001") Name (LORS, ResourceTemplate() { QWordIO ( ResourceConsumer, MinNotFixed, // _MIF MaxNotFixed, // _MAF PosDecode, EntireRange, 0x0, // _GRA 0xe4, // _MIN 0x3fff, // _MAX 0x0, // _TRA 0x04, // _LEN , , BTIO ) }) Since the IO resources of the child devices need to be translated from LPC bus addresses to logical PIO addresses, and we shouldn't modify the resources of the devices generated in the FW scan, a per-child MFD is created as a substitute. The MFD IO resources will be the translated bus addresses of the ACPI child. Signed-off-by: John Garry Signed-off-by: Zhichang Yuan Signed-off-by: Gabriele Paoloni Reviewed-by: Andy Shevchenko Tested-by: dann frazier --- drivers/bus/hisi_lpc.c | 202 +++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 202 insertions(+) diff --git a/drivers/bus/hisi_lpc.c b/drivers/bus/hisi_lpc.c index c331609..9d38cfa 100644 --- a/drivers/bus/hisi_lpc.c +++ b/drivers/bus/hisi_lpc.c @@ -12,6 +12,7 @@ #include #include #include +#include #include #include #include @@ -346,6 +347,204 @@ static void hisi_lpc_comm_out(void *hostdata, unsigned long pio, .outs = hisi_lpc_comm_outs, }; +#ifdef CONFIG_ACPI +#define MFD_CHILD_NAME_PREFIX DRV_NAME"-" +#define MFD_CHILD_NAME_LEN (ACPI_ID_LEN + sizeof(MFD_CHILD_NAME_PREFIX) - 1) + +struct hisi_lpc_mfd_cell { + struct mfd_cell_acpi_match acpi_match; + char name[MFD_CHILD_NAME_LEN]; + char pnpid[ACPI_ID_LEN]; +}; + +static int hisi_lpc_acpi_xlat_io_res(struct acpi_device *adev, + struct acpi_device *host, + struct resource *res) +{ + unsigned long sys_port; + resource_size_t len = resource_size(res); + + sys_port = logic_pio_trans_hwaddr(&host->fwnode, res->start, len); + if (sys_port == ~0UL) + return -EFAULT; + + res->start = sys_port; + res->end = sys_port + len; + + return 0; +} + +/* + * hisi_lpc_acpi_set_io_res - set the resources for a child's MFD + * @child: the device node to be updated the I/O resource + * @hostdev: the device node associated with host controller + * @res: double pointer to be set to the address of translated resources + * @num_res: pointer to variable to hold the number of translated resources + * + * Returns 0 when successful, and a negative value for failure. + * + * For a given host controller, each child device will have an associated + * host-relative address resource. This function will return the translated + * logical PIO addresses for each child devices resources. + */ +static int hisi_lpc_acpi_set_io_res(struct device *child, + struct device *hostdev, + const struct resource **res, + int *num_res) +{ + struct acpi_device *adev; + struct acpi_device *host; + struct resource_entry *rentry; + LIST_HEAD(resource_list); + struct resource *resources; + int count; + int i; + + if (!child || !hostdev) + return -EINVAL; + + host = to_acpi_device(hostdev); + adev = to_acpi_device(child); + + /* check the device state */ + if (!adev->status.present) { + dev_dbg(child, "device is not present\n"); + return -EIO; + } + /* whether the child had been enumerated? */ + if (acpi_device_enumerated(adev)) { + dev_dbg(child, "has been enumerated\n"); + return -EIO; + } + + /* + * The following code segment to retrieve the resources is common to + * acpi_create_platform_device(), so consider a common helper function + * in future. + */ + count = acpi_dev_get_resources(adev, &resource_list, NULL, NULL); + if (count <= 0) { + dev_dbg(child, "failed to get resources\n"); + return count ? count : -EIO; + } + + resources = devm_kcalloc(hostdev, count, sizeof(*resources), + GFP_KERNEL); + if (!resources) { + dev_warn(hostdev, "could not allocate memory for %d resources\n", + count); + acpi_dev_free_resource_list(&resource_list); + return -ENOMEM; + } + count = 0; + list_for_each_entry(rentry, &resource_list, node) + resources[count++] = *rentry->res; + + acpi_dev_free_resource_list(&resource_list); + + /* translate the I/O resources */ + for (i = 0; i < count; i++) { + int ret; + + if (!(resources[i].flags & IORESOURCE_IO)) + continue; + ret = hisi_lpc_acpi_xlat_io_res(adev, host, &resources[i]); + if (ret) { + dev_err(child, "translate IO range failed(%d)\n", ret); + return ret; + } + } + *res = resources; + *num_res = count; + + return 0; +} + +/* + * hisi_lpc_acpi_probe - probe children for ACPI FW + * @hostdev: LPC host device pointer + * + * Returns 0 when successful, and a negative value for failure. + * + * Scan all child devices and create a per-device MFD with + * logical PIO translated IO resources. + */ +static int hisi_lpc_acpi_probe(struct device *hostdev) +{ + struct acpi_device *adev = ACPI_COMPANION(hostdev); + struct hisi_lpc_mfd_cell *hisi_lpc_mfd_cells; + struct mfd_cell *mfd_cells; + struct acpi_device *child; + int size, ret, count = 0, cell_num = 0; + + list_for_each_entry(child, &adev->children, node) + cell_num++; + + /* allocate the mfd cell and companion ACPI info, one per child */ + size = sizeof(*mfd_cells) + sizeof(*hisi_lpc_mfd_cells); + mfd_cells = devm_kcalloc(hostdev, cell_num, size, GFP_KERNEL); + if (!mfd_cells) + return -ENOMEM; + + hisi_lpc_mfd_cells = (struct hisi_lpc_mfd_cell *)&mfd_cells[cell_num]; + /* Only consider the children of the host */ + list_for_each_entry(child, &adev->children, node) { + struct mfd_cell *mfd_cell = &mfd_cells[count]; + struct hisi_lpc_mfd_cell *hisi_lpc_mfd_cell = + &hisi_lpc_mfd_cells[count]; + struct mfd_cell_acpi_match *acpi_match = + &hisi_lpc_mfd_cell->acpi_match; + char *name = hisi_lpc_mfd_cell[count].name; + char *pnpid = hisi_lpc_mfd_cell[count].pnpid; + struct mfd_cell_acpi_match match = { + .pnpid = pnpid, + }; + + /* + * For any instances of this host controller (hip06 and hip07 + * are the only chipsets), we would not have multiple slaves + * with the same HID. And in any system we would have just one + * controller active. So don't worrry about MFD name clashes. + */ + snprintf(name, MFD_CHILD_NAME_LEN, MFD_CHILD_NAME_PREFIX"%s", + acpi_device_hid(child)); + snprintf(pnpid, ACPI_ID_LEN, "%s", acpi_device_hid(child)); + + memcpy(acpi_match, &match, sizeof(*acpi_match)); + mfd_cell->name = name; + mfd_cell->acpi_match = acpi_match; + + ret = hisi_lpc_acpi_set_io_res(&child->dev, &adev->dev, + &mfd_cell->resources, + &mfd_cell->num_resources); + if (ret) { + dev_warn(&child->dev, "set resource fail(%d)\n", ret); + return ret; + } + count++; + } + + ret = mfd_add_devices(hostdev, PLATFORM_DEVID_NONE, + mfd_cells, cell_num, NULL, 0, NULL); + if (ret) { + dev_err(hostdev, "failed to add mfd cells (%d)\n", ret); + return ret; + } + + return 0; +} + +static const struct acpi_device_id hisi_lpc_acpi_match[] = { + {"HISI0191"}, + {} +}; +#else +static int hisi_lpc_acpi_probe(struct device *dev) +{ + return -ENODEV; +} +#endif // CONFIG_ACPI + /* * hisi_lpc_probe - the probe callback function for hisi lpc host, * will finish all the initialization. @@ -391,6 +590,8 @@ static int hisi_lpc_probe(struct platform_device *pdev) /* register the LPC host PIO resources */ if (!acpi_device) ret = of_platform_populate(dev->of_node, NULL, NULL, dev); + else + ret = hisi_lpc_acpi_probe(dev); if (ret) return ret; @@ -414,6 +615,7 @@ static int hisi_lpc_probe(struct platform_device *pdev) .driver = { .name = DRV_NAME, .of_match_table = hisi_lpc_of_match, + .acpi_match_table = ACPI_PTR(hisi_lpc_acpi_match), }, .probe = hisi_lpc_probe, }; -- 1.9.1