This patch implements the AHCI suspend/resume.
It integrates the suspend/resume operations with Power Management
framework.
Signed-off-by: Forrest Zhao <forrest.zhaot@xxxxxxxxx>
Signed-off-by: Hannes Reinecke <hare@xxxxxxx>
Signed-off-by: Jens Axboe <axboe@xxxxxxx>
---
drivers/scsi/ahci.c | 129 ++++++++++++++++++++++++++++++++++++++++++++
+++++++
1 files changed, 129 insertions(+), 0 deletions(-)
6fd581dceefd2f40212c468a3e0c7c49c60c0500
diff --git a/drivers/scsi/ahci.c b/drivers/scsi/ahci.c
index dc76798..28e1419 100644
--- a/drivers/scsi/ahci.c
+++ b/drivers/scsi/ahci.c
@@ -221,9 +221,12 @@ static void ahci_freeze(struct ata_port
static void ahci_thaw(struct ata_port *ap);
static void ahci_error_handler(struct ata_port *ap);
static void ahci_post_internal_cmd(struct ata_queued_cmd *qc);
+static int ahci_pci_device_suspend(struct pci_dev *pdev, pm_message_t
state);
+static int ahci_pci_device_resume(struct pci_dev *pdev);
static int ahci_port_standby(void __iomem *port_mmio, u32 cap);
static int ahci_port_spinup(void __iomem *port_mmio, u32 cap);
static int ahci_port_suspend(struct ata_port *ap, pm_message_t state);
+static int ahci_port_resume(struct ata_port *ap);
static void ahci_remove_one (struct pci_dev *pdev);
static struct scsi_host_template ahci_sht = {
@@ -243,6 +246,8 @@ static struct scsi_host_template ahci_sh
.slave_configure = ata_scsi_slave_config,
.slave_destroy = ata_scsi_slave_destroy,
.bios_param = ata_std_bios_param,
+ .resume = ata_scsi_device_resume,
+ .suspend = ata_scsi_device_suspend,
};
static const struct ata_port_operations ahci_ops = {
@@ -371,6 +376,8 @@ static struct pci_driver ahci_pci_driver
.id_table = ahci_pci_tbl,
.probe = ahci_init_one,
.remove = ahci_remove_one,
+ .suspend = ahci_pci_device_suspend,
+ .resume = ahci_pci_device_resume,
};
@@ -507,6 +514,57 @@ static int ahci_port_suspend(struct ata_
return rc;
}
+static int ahci_port_resume(struct ata_port *ap)
+{
+ void __iomem *mmio = ap->host_set->mmio_base;
+ void __iomem *port_mmio = ahci_port_base(mmio, ap->port_no);
+ struct ahci_host_priv *hpriv = ap->host_set->private_data;
+ struct ahci_port_priv *pp = ap->private_data;
+ int rc;
+ u32 tmp;
+
+ /*
+ * Enable FIS reception
+ */
+ ahci_start_fis_rx(port_mmio, pp, hpriv);
+
+ rc = ahci_port_spinup(port_mmio, hpriv->cap);
+ if (rc)
+ ata_port_printk(ap, KERN_WARNING, "Could not spinup device"
+ " (%d)\n", rc);
+
+ /*
+ * Clear error status
+ */
+ tmp = readl(port_mmio + PORT_SCR_ERR);
+ writel(tmp, port_mmio + PORT_SCR_ERR);
+ /*
+ * Clear interrupt status
+ */
+ tmp = readl(mmio + HOST_CTL);
+ if (!(tmp & HOST_IRQ_EN)) {
+ u32 irq_stat;
+
+ /* ack any pending irq events for this port */
+ irq_stat = readl(port_mmio + PORT_IRQ_STAT);
+ if (irq_stat)
+ writel(irq_stat, port_mmio + PORT_IRQ_STAT);
+
+ /* set irq mask (enables interrupts) */
+ writel(DEF_PORT_IRQ, port_mmio + PORT_IRQ_MASK);
+ }
+
+ /*
+ * Enable DMA
+ */
+ rc = ahci_start_engine(port_mmio);
+ if (rc)
+ ata_port_printk(ap, KERN_WARNING, "Can't start DMA engine"
+ " (%d)\n", rc);
+
+ return rc;
+}
+
static u32 ahci_scr_read (struct ata_port *ap, unsigned int sc_reg_in)
{
unsigned int sc_reg;
@@ -1022,6 +1080,77 @@ static unsigned int ahci_fill_sg(struct
return n_sg;
}
+int ahci_pci_device_suspend(struct pci_dev *pdev, pm_message_t state)
+{
+ struct ata_host_set *host_set = dev_get_drvdata(&pdev->dev);
+ void __iomem *mmio = host_set->mmio_base;
+ u32 tmp;
+ int i;
+
+ /* First suspend all ports */
+ for (i = 0; i < host_set->n_ports; i++) {
+ struct ata_port *ap;
+
+ ap = host_set->ports[i];
+ ahci_port_suspend(ap, state);
+ }
+
+ /*
+ * AHCI spec rev1.1 section 8.3.3:
+ * Software must disable interrupts prior to
+ * requesting a transition of the HBA to
+ * D3 state.
+ */
+ tmp = readl(mmio + HOST_CTL);
+ tmp &= ~HOST_IRQ_EN;
+ writel(tmp, mmio + HOST_CTL);
+ tmp = readl(mmio + HOST_CTL); /* flush */
+
+ ata_pci_device_do_suspend(pdev, state);
+
+ return 0;
+}
+
+int ahci_pci_device_resume(struct pci_dev *pdev)
+{
+ struct device *dev = pci_dev_to_dev(pdev);
+ struct ata_host_set *host_set = dev_get_drvdata(dev);
+ void __iomem *mmio = host_set->mmio_base;
+ struct ata_port *ap;
+ u32 i, tmp, irq_stat;
+
+ tmp = readl(mmio + HOST_CTL);
+ if (!(tmp & HOST_AHCI_EN)) {
+ tmp |= HOST_AHCI_EN;
+ writel(tmp, mmio + HOST_CTL);
+ tmp = readl(mmio + HOST_CTL);
+ }
+
+ ata_pci_device_do_resume(pdev);
+
+ /* Resume all ports */
+ for (i = 0; i < host_set->n_ports; i++) {
+ ap = host_set->ports[i];
+ ahci_port_resume(ap);
+ }
+
+ /*
+ * Clear interrupt status and enable interrupt
+ */
+ if (!(tmp & HOST_IRQ_EN)) {
+ irq_stat = readl(mmio + HOST_IRQ_STAT);
+ if (irq_stat)
+ writel(irq_stat, mmio + HOST_IRQ_STAT);
+ tmp |= HOST_IRQ_EN;
+ writel(tmp, mmio + HOST_CTL);
+ tmp = readl(mmio + HOST_CTL);
+ }
+
+ ata_host_set_resume(host_set);
+
+ return 0;
+}
+
static void ahci_qc_prep(struct ata_queued_cmd *qc)
{
struct ata_port *ap = qc->ap;
--
1.2.6
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