From: Denis Efremov <efremov@linux.com>
To: Bjorn Helgaas <bhelgaas@google.com>
Cc: Lukas Wunner <lukas@wunner.de>,
linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org,
Denis Efremov <efremov@linux.com>
Subject: [PATCH v2 1/4] PCI: pciehp: Add pciehp_set_indicators() to jointly set LED indicators
Date: Sun, 11 Aug 2019 22:59:41 +0300 [thread overview]
Message-ID: <20190811195944.23765-2-efremov@linux.com> (raw)
In-Reply-To: <20190811195944.23765-1-efremov@linux.com>
Add pciehp_set_indicators() to set power and attention indicators with a
single register write. Thus, avoiding waiting twice for Command Complete.
enum pciehp_indicator introduced to switch between the indicators statuses.
Signed-off-by: Denis Efremov <efremov@linux.com>
---
drivers/pci/hotplug/pciehp.h | 14 ++++++++++++
drivers/pci/hotplug/pciehp_hpc.c | 38 ++++++++++++++++++++++++++++++++
include/uapi/linux/pci_regs.h | 2 ++
3 files changed, 54 insertions(+)
diff --git a/drivers/pci/hotplug/pciehp.h b/drivers/pci/hotplug/pciehp.h
index 8c51a04b8083..17305a6f01f1 100644
--- a/drivers/pci/hotplug/pciehp.h
+++ b/drivers/pci/hotplug/pciehp.h
@@ -150,6 +150,17 @@ struct controller {
#define NO_CMD_CMPL(ctrl) ((ctrl)->slot_cap & PCI_EXP_SLTCAP_NCCS)
#define PSN(ctrl) (((ctrl)->slot_cap & PCI_EXP_SLTCAP_PSN) >> 19)
+enum pciehp_indicator {
+ ATTN_NONE = -1,
+ ATTN_ON = 1,
+ ATTN_BLINK = 2,
+ ATTN_OFF = 3,
+ PWR_NONE = -1,
+ PWR_ON = 1,
+ PWR_BLINK = 2,
+ PWR_OFF = 3,
+};
+
void pciehp_request(struct controller *ctrl, int action);
void pciehp_handle_button_press(struct controller *ctrl);
void pciehp_handle_disable_request(struct controller *ctrl);
@@ -167,6 +178,9 @@ int pciehp_power_on_slot(struct controller *ctrl);
void pciehp_power_off_slot(struct controller *ctrl);
void pciehp_get_power_status(struct controller *ctrl, u8 *status);
+void pciehp_set_indicators(struct controller *ctrl,
+ enum pciehp_indicator pwr,
+ enum pciehp_indicator attn);
void pciehp_set_attention_status(struct controller *ctrl, u8 status);
void pciehp_get_latch_status(struct controller *ctrl, u8 *status);
int pciehp_query_power_fault(struct controller *ctrl);
diff --git a/drivers/pci/hotplug/pciehp_hpc.c b/drivers/pci/hotplug/pciehp_hpc.c
index bd990e3371e3..5a690b1579ec 100644
--- a/drivers/pci/hotplug/pciehp_hpc.c
+++ b/drivers/pci/hotplug/pciehp_hpc.c
@@ -443,6 +443,44 @@ void pciehp_set_attention_status(struct controller *ctrl, u8 value)
pci_pcie_cap(ctrl->pcie->port) + PCI_EXP_SLTCTL, slot_cmd);
}
+void pciehp_set_indicators(struct controller *ctrl,
+ enum pciehp_indicator pwr,
+ enum pciehp_indicator attn)
+{
+ u16 cmd = 0, mask = 0;
+
+ if ((!PWR_LED(ctrl) || pwr == PWR_NONE) &&
+ (!ATTN_LED(ctrl) || attn == ATTN_NONE))
+ return;
+
+ switch (pwr) {
+ case PWR_ON:
+ case PWR_BLINK:
+ case PWR_OFF:
+ cmd = pwr << PCI_EXP_SLTCTL_PWR_IND_OFFSET;
+ mask = PCI_EXP_SLTCTL_PIC;
+ break;
+ default:
+ break;
+ }
+
+ switch (attn) {
+ case ATTN_ON:
+ case ATTN_BLINK:
+ case ATTN_OFF:
+ cmd |= attn << PCI_EXP_SLTCTL_ATTN_IND_OFFSET;
+ mask |= PCI_EXP_SLTCTL_AIC;
+ break;
+ default:
+ break;
+ }
+
+ pcie_write_cmd_nowait(ctrl, cmd, mask);
+ ctrl_dbg(ctrl, "%s: SLOTCTRL %x write cmd %x\n", __func__,
+ pci_pcie_cap(ctrl->pcie->port) + PCI_EXP_SLTCTL,
+ cmd);
+}
+
void pciehp_green_led_on(struct controller *ctrl)
{
if (!PWR_LED(ctrl))
diff --git a/include/uapi/linux/pci_regs.h b/include/uapi/linux/pci_regs.h
index f28e562d7ca8..18722d1f54a0 100644
--- a/include/uapi/linux/pci_regs.h
+++ b/include/uapi/linux/pci_regs.h
@@ -591,10 +591,12 @@
#define PCI_EXP_SLTCTL_CCIE 0x0010 /* Command Completed Interrupt Enable */
#define PCI_EXP_SLTCTL_HPIE 0x0020 /* Hot-Plug Interrupt Enable */
#define PCI_EXP_SLTCTL_AIC 0x00c0 /* Attention Indicator Control */
+#define PCI_EXP_SLTCTL_ATTN_IND_OFFSET 0x6 /* Attention Indicator Offset */
#define PCI_EXP_SLTCTL_ATTN_IND_ON 0x0040 /* Attention Indicator on */
#define PCI_EXP_SLTCTL_ATTN_IND_BLINK 0x0080 /* Attention Indicator blinking */
#define PCI_EXP_SLTCTL_ATTN_IND_OFF 0x00c0 /* Attention Indicator off */
#define PCI_EXP_SLTCTL_PIC 0x0300 /* Power Indicator Control */
+#define PCI_EXP_SLTCTL_PWR_IND_OFFSET 0x8 /* Power Indicator Offset */
#define PCI_EXP_SLTCTL_PWR_IND_ON 0x0100 /* Power Indicator on */
#define PCI_EXP_SLTCTL_PWR_IND_BLINK 0x0200 /* Power Indicator blinking */
#define PCI_EXP_SLTCTL_PWR_IND_OFF 0x0300 /* Power Indicator off */
--
2.21.0
next prev parent reply other threads:[~2019-08-11 20:00 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-08-11 19:59 [PATCH v2 0/4] Simplify PCIe hotplug indicator control Denis Efremov
2019-08-11 19:59 ` Denis Efremov [this message]
2019-08-12 6:30 ` [PATCH v2 1/4] PCI: pciehp: Add pciehp_set_indicators() to jointly set LED indicators Lukas Wunner
2019-08-12 18:25 ` sathyanarayanan kuppuswamy
2019-08-12 18:49 ` sathyanarayanan kuppuswamy
2019-08-12 20:40 ` Lukas Wunner
2019-08-12 21:03 ` sathyanarayanan kuppuswamy
2019-08-12 20:03 ` Bjorn Helgaas
2019-08-11 19:59 ` [PATCH v2 2/4] PCI: pciehp: Switch LED indicators with a single write Denis Efremov
2019-08-12 18:27 ` sathyanarayanan kuppuswamy
2019-08-11 19:59 ` [PATCH v2 3/4] PCI: pciehp: Replace pciehp_set_attention_status() Denis Efremov
2019-08-12 6:32 ` Lukas Wunner
2019-08-12 18:28 ` sathyanarayanan kuppuswamy
2019-08-11 19:59 ` [PATCH v2 4/4] PCI: pciehp: Replace pciehp_green_led_{on,off,blink}() Denis Efremov
2019-08-12 18:45 ` sathyanarayanan kuppuswamy
2019-08-12 20:03 ` Bjorn Helgaas
2019-08-12 21:14 ` Denis Efremov
2019-08-12 22:12 ` Bjorn Helgaas
2019-08-12 20:02 ` [PATCH v2 0/4] Simplify PCIe hotplug indicator control Bjorn Helgaas
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