From 50408712b50f51b086556a59aaae2078d0fa2094 Mon Sep 17 00:00:00 2001 From: John Garry Date: Tue, 31 May 2016 20:38:49 +0800 Subject: [PATCH] hisi_sas: add v2 hw ACPI support Add support in v2 hw driver for ACPI. A check on whether an ACPI handle is available for the device is used to decide on whether to use ACPI reset handler or syscon for hw reset. Signed-off-by: John Garry Signed-off-by: Wei Xu Reviewed-by: Zhangfei Gao Signed-off-by: Martin K. Petersen --- drivers/scsi/hisi_sas/hisi_sas_v2_hw.c | 68 ++++++++++++++++---------- 1 file changed, 43 insertions(+), 25 deletions(-) diff --git a/drivers/scsi/hisi_sas/hisi_sas_v2_hw.c b/drivers/scsi/hisi_sas/hisi_sas_v2_hw.c index bd20c5488768..7d5edd1f4bba 100644 --- a/drivers/scsi/hisi_sas/hisi_sas_v2_hw.c +++ b/drivers/scsi/hisi_sas/hisi_sas_v2_hw.c @@ -721,30 +721,41 @@ static int reset_hw_v2_hw(struct hisi_hba *hisi_hba) return -EIO; } - /* reset and disable clock*/ - regmap_write(hisi_hba->ctrl, hisi_hba->ctrl_reset_reg, - reset_val); - regmap_write(hisi_hba->ctrl, hisi_hba->ctrl_clock_ena_reg + 4, - reset_val); - msleep(1); - regmap_read(hisi_hba->ctrl, hisi_hba->ctrl_reset_sts_reg, &val); - if (reset_val != (val & reset_val)) { - dev_err(dev, "SAS reset fail.\n"); - return -EIO; - } + if (ACPI_HANDLE(dev)) { + acpi_status s; - /* De-reset and enable clock*/ - regmap_write(hisi_hba->ctrl, hisi_hba->ctrl_reset_reg + 4, - reset_val); - regmap_write(hisi_hba->ctrl, hisi_hba->ctrl_clock_ena_reg, - reset_val); - msleep(1); - regmap_read(hisi_hba->ctrl, hisi_hba->ctrl_reset_sts_reg, - &val); - if (val & reset_val) { - dev_err(dev, "SAS de-reset fail.\n"); - return -EIO; - } + s = acpi_evaluate_object(ACPI_HANDLE(dev), "_RST", NULL, NULL); + if (ACPI_FAILURE(s)) { + dev_err(dev, "Reset failed\n"); + return -EIO; + } + } else if (hisi_hba->ctrl) { + /* reset and disable clock*/ + regmap_write(hisi_hba->ctrl, hisi_hba->ctrl_reset_reg, + reset_val); + regmap_write(hisi_hba->ctrl, hisi_hba->ctrl_clock_ena_reg + 4, + reset_val); + msleep(1); + regmap_read(hisi_hba->ctrl, hisi_hba->ctrl_reset_sts_reg, &val); + if (reset_val != (val & reset_val)) { + dev_err(dev, "SAS reset fail.\n"); + return -EIO; + } + + /* De-reset and enable clock*/ + regmap_write(hisi_hba->ctrl, hisi_hba->ctrl_reset_reg + 4, + reset_val); + regmap_write(hisi_hba->ctrl, hisi_hba->ctrl_clock_ena_reg, + reset_val); + msleep(1); + regmap_read(hisi_hba->ctrl, hisi_hba->ctrl_reset_sts_reg, + &val); + if (val & reset_val) { + dev_err(dev, "SAS de-reset fail.\n"); + return -EIO; + } + } else + dev_warn(dev, "no reset method\n"); return 0; } @@ -752,13 +763,12 @@ static int reset_hw_v2_hw(struct hisi_hba *hisi_hba) static void init_reg_v2_hw(struct hisi_hba *hisi_hba) { struct device *dev = &hisi_hba->pdev->dev; - struct device_node *np = dev->of_node; int i; /* Global registers init */ /* Deal with am-max-transmissions quirk */ - if (of_get_property(np, "hip06-sas-v2-quirk-amt", NULL)) { + if (device_property_present(dev, "hip06-sas-v2-quirk-amt")) { hisi_sas_write32(hisi_hba, AM_CFG_MAX_TRANS, 0x2020); hisi_sas_write32(hisi_hba, AM_CFG_SINGLE_PORT_MAX_TRANS, 0x2020); @@ -2260,12 +2270,20 @@ static const struct of_device_id sas_v2_of_match[] = { }; MODULE_DEVICE_TABLE(of, sas_v2_of_match); +static const struct acpi_device_id sas_v2_acpi_match[] = { + { "HISI0162", 0 }, + { } +}; + +MODULE_DEVICE_TABLE(acpi, sas_v2_acpi_match); + static struct platform_driver hisi_sas_v2_driver = { .probe = hisi_sas_v2_probe, .remove = hisi_sas_v2_remove, .driver = { .name = DRV_NAME, .of_match_table = sas_v2_of_match, + .acpi_match_table = ACPI_PTR(sas_v2_acpi_match), }, }; -- 2.20.1