Commit ae8723f8 authored by Bartlomiej Zolnierkiewicz's avatar Bartlomiej Zolnierkiewicz Committed by Tejun Heo
Browse files

ata: add new-style AHCI platform driver for DaVinci DA850 AHCI controller 



Add the new ahci_da850 host driver.

Platform changes needed to make DaVinci DA850 SATA AHCI support
fully functional are in the separate "ARM: davinci: da850: update
SATA AHCI support" commit.

Please note that this driver doesn't have the superfluous clock
control code as clock is already handled by the generic AHCI
platform library code.

Cc: Sekhar Nori <nsekhar@ti.com>
Cc: Kevin Hilman <khilman@deeprootsystems.com>
Cc: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: default avatarBartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
Signed-off-by: default avatarTejun Heo <tj@kernel.org>
parent fd990556

drivers/ata/Kconfig

+9 −0
Original line number Diff line number Diff line
@@ -97,6 +97,15 @@ config SATA_AHCI_PLATFORM 


	  If unsure, say N.



config AHCI_DA850

	tristate "DaVinci DA850 AHCI SATA support"

	depends on ARCH_DAVINCI_DA850

	help

	  This option enables support for the DaVinci DA850 SoC's

	  onboard AHCI SATA.



	  If unsure, say N.



config AHCI_ST

	tristate "ST AHCI SATA support"

	depends on ARCH_STI

drivers/ata/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -10,6 +10,7 @@ obj-$(CONFIG_SATA_INIC162X) += sata_inic162x.o 
obj-$(CONFIG_SATA_SIL24)	+= sata_sil24.o

obj-$(CONFIG_SATA_DWC)		+= sata_dwc_460ex.o

obj-$(CONFIG_SATA_HIGHBANK)	+= sata_highbank.o libahci.o

obj-$(CONFIG_AHCI_DA850)	+= ahci_da850.o libahci.o libahci_platform.o

obj-$(CONFIG_AHCI_IMX)		+= ahci_imx.o libahci.o libahci_platform.o

obj-$(CONFIG_AHCI_SUNXI)	+= ahci_sunxi.o libahci.o libahci_platform.o

obj-$(CONFIG_AHCI_ST)		+= ahci_st.o libahci.o libahci_platform.o

drivers/ata/ahci_da850.c

0 → 100644
+114 −0
Original line number Diff line number Diff line 
/*

 * DaVinci DA850 AHCI SATA platform driver

 *

 * 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, or (at your option)

 * any later version.

 */



#include <linux/kernel.h>

#include <linux/module.h>

#include <linux/pm.h>

#include <linux/device.h>

#include <linux/platform_device.h>

#include <linux/libata.h>

#include <linux/ahci_platform.h>

#include "ahci.h"



/* SATA PHY Control Register offset from AHCI base */

#define SATA_P0PHYCR_REG	0x178



#define SATA_PHY_MPY(x)		((x) << 0)

#define SATA_PHY_LOS(x)		((x) << 6)

#define SATA_PHY_RXCDR(x)	((x) << 10)

#define SATA_PHY_RXEQ(x)	((x) << 13)

#define SATA_PHY_TXSWING(x)	((x) << 19)

#define SATA_PHY_ENPLL(x)	((x) << 31)



/*

 * The multiplier needed for 1.5GHz PLL output.

 *

 * NOTE: This is currently hardcoded to be suitable for 100MHz crystal

 * frequency (which is used by DA850 EVM board) and may need to be changed

 * if you would like to use this driver on some other board.

 */

#define DA850_SATA_CLK_MULTIPLIER	7



static void da850_sata_init(struct device *dev, void __iomem *pwrdn_reg,

			    void __iomem *ahci_base)

{

	unsigned int val;



	/* Enable SATA clock receiver */

	val = readl(pwrdn_reg);

	val &= ~BIT(0);

	writel(val, pwrdn_reg);



	val = SATA_PHY_MPY(DA850_SATA_CLK_MULTIPLIER + 1) | SATA_PHY_LOS(1) |

	      SATA_PHY_RXCDR(4) | SATA_PHY_RXEQ(1) | SATA_PHY_TXSWING(3) |

	      SATA_PHY_ENPLL(1);



	writel(val, ahci_base + SATA_P0PHYCR_REG);

}



static const struct ata_port_info ahci_da850_port_info = {

	.flags		= AHCI_FLAG_COMMON,

	.pio_mask	= ATA_PIO4,

	.udma_mask	= ATA_UDMA6,

	.port_ops	= &ahci_platform_ops,

};



static int ahci_da850_probe(struct platform_device *pdev)

{

	struct device *dev = &pdev->dev;

	struct ahci_host_priv *hpriv;

	struct resource *res;

	void __iomem *pwrdn_reg;

	int rc;



	hpriv = ahci_platform_get_resources(pdev);

	if (IS_ERR(hpriv))

		return PTR_ERR(hpriv);



	rc = ahci_platform_enable_resources(hpriv);

	if (rc)

		return rc;



	res = platform_get_resource(pdev, IORESOURCE_MEM, 1);

	if (!res)

		goto disable_resources;



	pwrdn_reg = devm_ioremap(dev, res->start, resource_size(res));

	if (!pwrdn_reg)

		goto disable_resources;



	da850_sata_init(dev, pwrdn_reg, hpriv->mmio);



	rc = ahci_platform_init_host(pdev, hpriv, &ahci_da850_port_info, 0, 0);

	if (rc)

		goto disable_resources;



	return 0;

disable_resources:

	ahci_platform_disable_resources(hpriv);

	return rc;

}



static SIMPLE_DEV_PM_OPS(ahci_da850_pm_ops, ahci_platform_suspend,

			 ahci_platform_resume);



static struct platform_driver ahci_da850_driver = {

	.probe = ahci_da850_probe,

	.remove = ata_platform_remove_one,

	.driver = {

		.name = "ahci_da850",

		.owner = THIS_MODULE,

		.pm = &ahci_da850_pm_ops,

	},

};

module_platform_driver(ahci_da850_driver);



MODULE_DESCRIPTION("DaVinci DA850 AHCI SATA platform driver");

MODULE_AUTHOR("Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>");

MODULE_LICENSE("GPL");

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