ahci_seattle.c
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// SPDX-License-Identifier: GPL-2.0-only
/*
* AMD Seattle AHCI SATA driver
*
* Copyright (c) 2015, Advanced Micro Devices
* Author: Brijesh Singh <brijesh.singh@amd.com>
*
* based on the AHCI SATA platform driver by Jeff Garzik and Anton Vorontsov
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/pm.h>
#include <linux/device.h>
#include <linux/of_device.h>
#include <linux/platform_device.h>
#include <linux/libata.h>
#include <linux/ahci_platform.h>
#include <linux/acpi.h>
#include <linux/pci_ids.h>
#include "ahci.h"
/* SGPIO Control Register definition
*
* Bit Type Description
* 31 RW OD7.2 (activity)
* 30 RW OD7.1 (locate)
* 29 RW OD7.0 (fault)
* 28...8 RW OD6.2...OD0.0 (3bits per port, 1 bit per LED)
* 7 RO SGPIO feature flag
* 6:4 RO Reserved
* 3:0 RO Number of ports (0 means no port supported)
*/
#define ACTIVITY_BIT_POS(x) (8 + (3 * x))
#define LOCATE_BIT_POS(x) (ACTIVITY_BIT_POS(x) + 1)
#define FAULT_BIT_POS(x) (LOCATE_BIT_POS(x) + 1)
#define ACTIVITY_MASK 0x00010000
#define LOCATE_MASK 0x00080000
#define FAULT_MASK 0x00400000
#define DRV_NAME "ahci-seattle"
static ssize_t seattle_transmit_led_message(struct ata_port *ap, u32 state,
ssize_t size);
struct seattle_plat_data {
void __iomem *sgpio_ctrl;
};
static struct ata_port_operations ahci_port_ops = {
.inherits = &ahci_ops,
};
static const struct ata_port_info ahci_port_info = {
.flags = AHCI_FLAG_COMMON,
.pio_mask = ATA_PIO4,
.udma_mask = ATA_UDMA6,
.port_ops = &ahci_port_ops,
};
static struct ata_port_operations ahci_seattle_ops = {
.inherits = &ahci_ops,
.transmit_led_message = seattle_transmit_led_message,
};
static const struct ata_port_info ahci_port_seattle_info = {
.flags = AHCI_FLAG_COMMON | ATA_FLAG_EM | ATA_FLAG_SW_ACTIVITY,
.link_flags = ATA_LFLAG_SW_ACTIVITY,
.pio_mask = ATA_PIO4,
.udma_mask = ATA_UDMA6,
.port_ops = &ahci_seattle_ops,
};
static struct scsi_host_template ahci_platform_sht = {
AHCI_SHT(DRV_NAME),
};
static ssize_t seattle_transmit_led_message(struct ata_port *ap, u32 state,
ssize_t size)
{
struct ahci_host_priv *hpriv = ap->host->private_data;
struct ahci_port_priv *pp = ap->private_data;
struct seattle_plat_data *plat_data = hpriv->plat_data;
unsigned long flags;
int pmp;
struct ahci_em_priv *emp;
u32 val;
/* get the slot number from the message */
pmp = (state & EM_MSG_LED_PMP_SLOT) >> 8;
if (pmp >= EM_MAX_SLOTS)
return -EINVAL;
emp = &pp->em_priv[pmp];
val = ioread32(plat_data->sgpio_ctrl);
if (state & ACTIVITY_MASK)
val |= 1 << ACTIVITY_BIT_POS((ap->port_no));
else
val &= ~(1 << ACTIVITY_BIT_POS((ap->port_no)));
if (state & LOCATE_MASK)
val |= 1 << LOCATE_BIT_POS((ap->port_no));
else
val &= ~(1 << LOCATE_BIT_POS((ap->port_no)));
if (state & FAULT_MASK)
val |= 1 << FAULT_BIT_POS((ap->port_no));
else
val &= ~(1 << FAULT_BIT_POS((ap->port_no)));
iowrite32(val, plat_data->sgpio_ctrl);
spin_lock_irqsave(ap->lock, flags);
/* save off new led state for port/slot */
emp->led_state = state;
spin_unlock_irqrestore(ap->lock, flags);
return size;
}
static const struct ata_port_info *ahci_seattle_get_port_info(
struct platform_device *pdev, struct ahci_host_priv *hpriv)
{
struct device *dev = &pdev->dev;
struct seattle_plat_data *plat_data;
u32 val;
plat_data = devm_kzalloc(dev, sizeof(*plat_data), GFP_KERNEL);
if (!plat_data)
return &ahci_port_info;
plat_data->sgpio_ctrl = devm_ioremap_resource(dev,
platform_get_resource(pdev, IORESOURCE_MEM, 1));
if (IS_ERR(plat_data->sgpio_ctrl))
return &ahci_port_info;
val = ioread32(plat_data->sgpio_ctrl);
if (!(val & 0xf))
return &ahci_port_info;
hpriv->em_loc = 0;
hpriv->em_buf_sz = 4;
hpriv->em_msg_type = EM_MSG_TYPE_LED;
hpriv->plat_data = plat_data;
dev_info(dev, "SGPIO LED control is enabled.\n");
return &ahci_port_seattle_info;
}
static int ahci_seattle_probe(struct platform_device *pdev)
{
int rc;
struct ahci_host_priv *hpriv;
hpriv = ahci_platform_get_resources(pdev, 0);
if (IS_ERR(hpriv))
return PTR_ERR(hpriv);
rc = ahci_platform_enable_resources(hpriv);
if (rc)
return rc;
rc = ahci_platform_init_host(pdev, hpriv,
ahci_seattle_get_port_info(pdev, hpriv),
&ahci_platform_sht);
if (rc)
goto disable_resources;
return 0;
disable_resources:
ahci_platform_disable_resources(hpriv);
return rc;
}
static SIMPLE_DEV_PM_OPS(ahci_pm_ops, ahci_platform_suspend,
ahci_platform_resume);
static const struct acpi_device_id ahci_acpi_match[] = {
{ "AMDI0600", 0 },
{}
};
MODULE_DEVICE_TABLE(acpi, ahci_acpi_match);
static struct platform_driver ahci_seattle_driver = {
.probe = ahci_seattle_probe,
.remove = ata_platform_remove_one,
.driver = {
.name = DRV_NAME,
.acpi_match_table = ahci_acpi_match,
.pm = &ahci_pm_ops,
},
};
module_platform_driver(ahci_seattle_driver);
MODULE_DESCRIPTION("Seattle AHCI SATA platform driver");
MODULE_AUTHOR("Brijesh Singh <brijesh.singh@amd.com>");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:" DRV_NAME);