Commit 535dac4a authored by Brijesh Singh's avatar Brijesh Singh Committed by Tejun Heo
Browse files

ata: add AMD Seattle platform driver 



AMD Seattle SATA controller mostly conforms to AHCI interface with some
special register to control SGPIO interface. In the case of an AHCI
controller, the SGPIO feature is ideally implemented using the
"Enclosure Management" register of the AHCI controller, but those
registeres are not implemented in the Seattle SoC. Instead SoC
(Rev B0 onwards) provides a 32-bit SGPIO control register which should
be programmed to control the activity, locate and fault LEDs.

The driver is based on ahci_platform driver.

Signed-off-by: default avatarBrijesh Singh <brijesh.singh@amd.com>
Acked-by: default avatarHans de Goede <hdegoede@redhat.com>
CC: tj@kernel.org
CC: linux-ide@vger.kernel.org
Signed-off-by: default avatarTejun Heo <tj@kernel.org>
parent bb4add2c

drivers/ata/Kconfig

+8 −0
Original line number Diff line number Diff line
@@ -202,6 +202,14 @@ config SATA_FSL 


	  If unsure, say N.



config SATA_AHCI_SEATTLE

	tristate "AMD Seattle 6.0Gbps AHCI SATA host controller support"

	depends on ARCH_SEATTLE

	help

	 This option enables support for AMD Seattle SATA host controller.



	 If unsure, say N



config SATA_INIC162X

	tristate "Initio 162x SATA support (Very Experimental)"

	depends on PCI

drivers/ata/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -4,6 +4,7 @@ obj-$(CONFIG_ATA) += libata.o 
# non-SFF interface

obj-$(CONFIG_SATA_AHCI)		+= ahci.o libahci.o

obj-$(CONFIG_SATA_ACARD_AHCI)	+= acard-ahci.o libahci.o

obj-$(CONFIG_SATA_AHCI_SEATTLE)	+= ahci_seattle.o libahci.o libahci_platform.o

obj-$(CONFIG_SATA_AHCI_PLATFORM) += ahci_platform.o libahci.o libahci_platform.o

obj-$(CONFIG_SATA_FSL)		+= sata_fsl.o

obj-$(CONFIG_SATA_INIC162X)	+= sata_inic162x.o

drivers/ata/ahci_seattle.c

0 → 100644
+210 −0
Original line number Diff line number Diff line 
/*

 * 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

 *

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License as published by

 * the Free Software Foundation; either version 2 of the License.

 *

 * This program is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 * GNU General Public License for more details.

 */



#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 (IS_ERR(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);

	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);

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