Commit f10e8bff authored by Olof Johansson's avatar Olof Johansson
Browse files

Merge tag 'davinci-for-v4.12/drivers' of... 

Merge tag 'davinci-for-v4.12/drivers' of git://git.kernel.org/pub/scm/linux/kernel/git/nsekhar/linux-davinci into next/drivers

This adds a new driver for PalmChip PATA controller found on DM6446 and
DM6467 SoCs. This should eventually replace the driver in IDE subsystem.

The patches have been acked by ATA maintainer.

* tag 'davinci-for-v4.12/drivers' of git://git.kernel.org/pub/scm/linux/kernel/git/nsekhar/linux-davinci

:
  pata_bk3710: clear status bits of BMISP on chipset initialization
  pata_bk3710: disable IORDY Timer on chipset initialization
  ata: add Palmchip BK3710 PATA controller driver

Signed-off-by: default avatarOlof Johansson <olof@lixom.net>
parents be6beaa8 396ff64d

drivers/ata/Kconfig

+9 −0
Original line number Diff line number Diff line
@@ -510,6 +510,15 @@ config PATA_BF54X 


	  If unsure, say N.



config PATA_BK3710

	tristate "Palmchip BK3710 PATA support"

	depends on ARCH_DAVINCI

	help

	  This option enables support for the integrated IDE controller on

	  the TI DaVinci SoC.



	  If unsure, say N.



config PATA_CMD64X

	tristate "CMD64x PATA support"

	depends on PCI

drivers/ata/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -50,6 +50,7 @@ obj-$(CONFIG_PATA_ARTOP) += pata_artop.o 
obj-$(CONFIG_PATA_ATIIXP)	+= pata_atiixp.o

obj-$(CONFIG_PATA_ATP867X)	+= pata_atp867x.o

obj-$(CONFIG_PATA_BF54X)	+= pata_bf54x.o

obj-$(CONFIG_PATA_BK3710)	+= pata_bk3710.o

obj-$(CONFIG_PATA_CMD64X)	+= pata_cmd64x.o

obj-$(CONFIG_PATA_CS5520)	+= pata_cs5520.o

obj-$(CONFIG_PATA_CS5530)	+= pata_cs5530.o

drivers/ata/pata_bk3710.c

0 → 100644
+382 −0
Original line number Diff line number Diff line 
/*

 * Palmchip BK3710 PATA controller driver

 *

 * Copyright (c) 2017 Samsung Electronics Co., Ltd.

 *		http://www.samsung.com

 *

 * Based on palm_bk3710.c:

 *

 * Copyright (C) 2006 Texas Instruments.

 * Copyright (C) 2007 MontaVista Software, Inc., <source@mvista.com>

 *

 * This file is subject to the terms and conditions of the GNU General Public

 * License.  See the file "COPYING" in the main directory of this archive

 * for more details.

 */



#include <linux/ata.h>

#include <linux/clk.h>

#include <linux/delay.h>

#include <linux/init.h>

#include <linux/ioport.h>

#include <linux/kernel.h>

#include <linux/libata.h>

#include <linux/module.h>

#include <linux/platform_device.h>

#include <linux/types.h>



#define DRV_NAME "pata_bk3710"



#define BK3710_TF_OFFSET	0x1F0

#define BK3710_CTL_OFFSET	0x3F6



#define BK3710_BMISP		0x02

#define BK3710_IDETIMP		0x40

#define BK3710_UDMACTL		0x48

#define BK3710_MISCCTL		0x50

#define BK3710_REGSTB		0x54

#define BK3710_REGRCVR		0x58

#define BK3710_DATSTB		0x5C

#define BK3710_DATRCVR		0x60

#define BK3710_DMASTB		0x64

#define BK3710_DMARCVR		0x68

#define BK3710_UDMASTB		0x6C

#define BK3710_UDMATRP		0x70

#define BK3710_UDMAENV		0x74

#define BK3710_IORDYTMP		0x78



static struct scsi_host_template pata_bk3710_sht = {

	ATA_BMDMA_SHT(DRV_NAME),

};



static unsigned int ideclk_period; /* in nanoseconds */



struct pata_bk3710_udmatiming {

	unsigned int rptime;	/* tRP -- Ready to pause time (nsec) */

	unsigned int cycletime;	/* tCYCTYP2/2 -- avg Cycle Time (nsec) */

				/* tENV is always a minimum of 20 nsec */

};



static const struct pata_bk3710_udmatiming pata_bk3710_udmatimings[6] = {

	{ 160, 240 / 2 },	/* UDMA Mode 0 */

	{ 125, 160 / 2 },	/* UDMA Mode 1 */

	{ 100, 120 / 2 },	/* UDMA Mode 2 */

	{ 100,  90 / 2 },	/* UDMA Mode 3 */

	{ 100,  60 / 2 },	/* UDMA Mode 4 */

	{  85,  40 / 2 },	/* UDMA Mode 5 */

};



static void pata_bk3710_setudmamode(void __iomem *base, unsigned int dev,

				    unsigned int mode)

{

	u32 val32;

	u16 val16;

	u8 tenv, trp, t0;



	/* DMA Data Setup */

	t0 = DIV_ROUND_UP(pata_bk3710_udmatimings[mode].cycletime,

			  ideclk_period) - 1;

	tenv = DIV_ROUND_UP(20, ideclk_period) - 1;

	trp = DIV_ROUND_UP(pata_bk3710_udmatimings[mode].rptime,

			   ideclk_period) - 1;



	/* udmastb Ultra DMA Access Strobe Width */

	val32 = ioread32(base + BK3710_UDMASTB) & (0xFF << (dev ? 0 : 8));

	val32 |= t0 << (dev ? 8 : 0);

	iowrite32(val32, base + BK3710_UDMASTB);



	/* udmatrp Ultra DMA Ready to Pause Time */

	val32 = ioread32(base + BK3710_UDMATRP) & (0xFF << (dev ? 0 : 8));

	val32 |= trp << (dev ? 8 : 0);

	iowrite32(val32, base + BK3710_UDMATRP);



	/* udmaenv Ultra DMA envelop Time */

	val32 = ioread32(base + BK3710_UDMAENV) & (0xFF << (dev ? 0 : 8));

	val32 |= tenv << (dev ? 8 : 0);

	iowrite32(val32, base + BK3710_UDMAENV);



	/* Enable UDMA for Device */

	val16 = ioread16(base + BK3710_UDMACTL) | (1 << dev);

	iowrite16(val16, base + BK3710_UDMACTL);

}



static void pata_bk3710_setmwdmamode(void __iomem *base, unsigned int dev,

				     unsigned short min_cycle,

				     unsigned int mode)

{

	const struct ata_timing *t;

	int cycletime;

	u32 val32;

	u16 val16;

	u8 td, tkw, t0;



	t = ata_timing_find_mode(mode);

	cycletime = max_t(int, t->cycle, min_cycle);



	/* DMA Data Setup */

	t0 = DIV_ROUND_UP(cycletime, ideclk_period);

	td = DIV_ROUND_UP(t->active, ideclk_period);

	tkw = t0 - td - 1;

	td--;



	val32 = ioread32(base + BK3710_DMASTB) & (0xFF << (dev ? 0 : 8));

	val32 |= td << (dev ? 8 : 0);

	iowrite32(val32, base + BK3710_DMASTB);



	val32 = ioread32(base + BK3710_DMARCVR) & (0xFF << (dev ? 0 : 8));

	val32 |= tkw << (dev ? 8 : 0);

	iowrite32(val32, base + BK3710_DMARCVR);



	/* Disable UDMA for Device */

	val16 = ioread16(base + BK3710_UDMACTL) & ~(1 << dev);

	iowrite16(val16, base + BK3710_UDMACTL);

}



static void pata_bk3710_set_dmamode(struct ata_port *ap,

				    struct ata_device *adev)

{

	void __iomem *base = (void __iomem *)ap->ioaddr.bmdma_addr;

	int is_slave = adev->devno;

	const u8 xferspeed = adev->dma_mode;



	if (xferspeed >= XFER_UDMA_0)

		pata_bk3710_setudmamode(base, is_slave,

					xferspeed - XFER_UDMA_0);

	else

		pata_bk3710_setmwdmamode(base, is_slave,

					 adev->id[ATA_ID_EIDE_DMA_MIN],

					 xferspeed);

}



static void pata_bk3710_setpiomode(void __iomem *base, struct ata_device *pair,

				   unsigned int dev, unsigned int cycletime,

				   unsigned int mode)

{

	const struct ata_timing *t;

	u32 val32;

	u8 t2, t2i, t0;



	t = ata_timing_find_mode(XFER_PIO_0 + mode);



	/* PIO Data Setup */

	t0 = DIV_ROUND_UP(cycletime, ideclk_period);

	t2 = DIV_ROUND_UP(t->active, ideclk_period);



	t2i = t0 - t2 - 1;

	t2--;



	val32 = ioread32(base + BK3710_DATSTB) & (0xFF << (dev ? 0 : 8));

	val32 |= t2 << (dev ? 8 : 0);

	iowrite32(val32, base + BK3710_DATSTB);



	val32 = ioread32(base + BK3710_DATRCVR) & (0xFF << (dev ? 0 : 8));

	val32 |= t2i << (dev ? 8 : 0);

	iowrite32(val32, base + BK3710_DATRCVR);



	/* FIXME: this is broken also in the old driver */

	if (pair) {

		u8 mode2 = pair->pio_mode - XFER_PIO_0;



		if (mode2 < mode)

			mode = mode2;

	}



	/* TASKFILE Setup */

	t0 = DIV_ROUND_UP(t->cyc8b, ideclk_period);

	t2 = DIV_ROUND_UP(t->act8b, ideclk_period);



	t2i = t0 - t2 - 1;

	t2--;



	val32 = ioread32(base + BK3710_REGSTB) & (0xFF << (dev ? 0 : 8));

	val32 |= t2 << (dev ? 8 : 0);

	iowrite32(val32, base + BK3710_REGSTB);



	val32 = ioread32(base + BK3710_REGRCVR) & (0xFF << (dev ? 0 : 8));

	val32 |= t2i << (dev ? 8 : 0);

	iowrite32(val32, base + BK3710_REGRCVR);

}



static void pata_bk3710_set_piomode(struct ata_port *ap,

				    struct ata_device *adev)

{

	void __iomem *base = (void __iomem *)ap->ioaddr.bmdma_addr;

	struct ata_device *pair = ata_dev_pair(adev);

	const struct ata_timing *t = ata_timing_find_mode(adev->pio_mode);

	const u16 *id = adev->id;

	unsigned int cycle_time = 0;

	int is_slave = adev->devno;

	const u8 pio = adev->pio_mode - XFER_PIO_0;



	if (id[ATA_ID_FIELD_VALID] & 2) {

		if (ata_id_has_iordy(id))

			cycle_time = id[ATA_ID_EIDE_PIO_IORDY];

		else

			cycle_time = id[ATA_ID_EIDE_PIO];



		/* conservative "downgrade" for all pre-ATA2 drives */

		if (pio < 3 && cycle_time < t->cycle)

			cycle_time = 0; /* use standard timing */

	}



	if (!cycle_time)

		cycle_time = t->cycle;



	pata_bk3710_setpiomode(base, pair, is_slave, cycle_time, pio);

}



static void pata_bk3710_chipinit(void __iomem *base)

{

	/*

	 * REVISIT:  the ATA reset signal needs to be managed through a

	 * GPIO, which means it should come from platform_data.  Until

	 * we get and use such information, we have to trust that things

	 * have been reset before we get here.

	 */



	/*

	 * Program the IDETIMP Register Value based on the following assumptions

	 *

	 * (ATA_IDETIMP_IDEEN		, ENABLE ) |

	 * (ATA_IDETIMP_PREPOST1	, DISABLE) |

	 * (ATA_IDETIMP_PREPOST0	, DISABLE) |

	 *

	 * DM6446 silicon rev 2.1 and earlier have no observed net benefit

	 * from enabling prefetch/postwrite.

	 */

	iowrite16(BIT(15), base + BK3710_IDETIMP);



	/*

	 * UDMACTL Ultra-ATA DMA Control

	 * (ATA_UDMACTL_UDMAP1	, 0 ) |

	 * (ATA_UDMACTL_UDMAP0	, 0 )

	 *

	 */

	iowrite16(0, base + BK3710_UDMACTL);



	/*

	 * MISCCTL Miscellaneous Conrol Register

	 * (ATA_MISCCTL_HWNHLD1P	, 1 cycle)

	 * (ATA_MISCCTL_HWNHLD0P	, 1 cycle)

	 * (ATA_MISCCTL_TIMORIDE	, 1)

	 */

	iowrite32(0x001, base + BK3710_MISCCTL);



	/*

	 * IORDYTMP IORDY Timer for Primary Register

	 * (ATA_IORDYTMP_IORDYTMP	, DISABLE)

	 */

	iowrite32(0, base + BK3710_IORDYTMP);



	/*

	 * Configure BMISP Register

	 * (ATA_BMISP_DMAEN1	, DISABLE )	|

	 * (ATA_BMISP_DMAEN0	, DISABLE )	|

	 * (ATA_BMISP_IORDYINT	, CLEAR)	|

	 * (ATA_BMISP_INTRSTAT	, CLEAR)	|

	 * (ATA_BMISP_DMAERROR	, CLEAR)

	 */

	iowrite16(0xE, base + BK3710_BMISP);



	pata_bk3710_setpiomode(base, NULL, 0, 600, 0);

	pata_bk3710_setpiomode(base, NULL, 1, 600, 0);

}



static struct ata_port_operations pata_bk3710_ports_ops = {

	.inherits		= &ata_bmdma_port_ops,

	.cable_detect		= ata_cable_80wire,



	.set_piomode		= pata_bk3710_set_piomode,

	.set_dmamode		= pata_bk3710_set_dmamode,

};



static int __init pata_bk3710_probe(struct platform_device *pdev)

{

	struct clk *clk;

	struct resource *mem;

	struct ata_host *host;

	struct ata_port *ap;

	void __iomem *base;

	unsigned long rate;

	int irq;



	clk = devm_clk_get(&pdev->dev, NULL);

	if (IS_ERR(clk))

		return -ENODEV;



	clk_enable(clk);

	rate = clk_get_rate(clk);

	if (!rate)

		return -EINVAL;



	/* NOTE:  round *down* to meet minimum timings; we count in clocks */

	ideclk_period = 1000000000UL / rate;



	mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);



	irq = platform_get_irq(pdev, 0);

	if (irq < 0) {

		pr_err(DRV_NAME ": failed to get IRQ resource\n");

		return irq;

	}



	base = devm_ioremap_resource(&pdev->dev, mem);

	if (IS_ERR(base))

		return PTR_ERR(base);



	/* configure the Palmchip controller */

	pata_bk3710_chipinit(base);



	/* allocate host */

	host = ata_host_alloc(&pdev->dev, 1);

	if (!host)

		return -ENOMEM;

	ap = host->ports[0];



	ap->ops = &pata_bk3710_ports_ops;

	ap->pio_mask = ATA_PIO4;

	ap->mwdma_mask = ATA_MWDMA2;

	ap->udma_mask = rate < 100000000 ? ATA_UDMA4 : ATA_UDMA5;

	ap->flags |= ATA_FLAG_SLAVE_POSS;



	ap->ioaddr.data_addr		= base + BK3710_TF_OFFSET;

	ap->ioaddr.error_addr		= base + BK3710_TF_OFFSET + 1;

	ap->ioaddr.feature_addr		= base + BK3710_TF_OFFSET + 1;

	ap->ioaddr.nsect_addr		= base + BK3710_TF_OFFSET + 2;

	ap->ioaddr.lbal_addr		= base + BK3710_TF_OFFSET + 3;

	ap->ioaddr.lbam_addr		= base + BK3710_TF_OFFSET + 4;

	ap->ioaddr.lbah_addr		= base + BK3710_TF_OFFSET + 5;

	ap->ioaddr.device_addr		= base + BK3710_TF_OFFSET + 6;

	ap->ioaddr.status_addr		= base + BK3710_TF_OFFSET + 7;

	ap->ioaddr.command_addr		= base + BK3710_TF_OFFSET + 7;



	ap->ioaddr.altstatus_addr	= base + BK3710_CTL_OFFSET;

	ap->ioaddr.ctl_addr		= base + BK3710_CTL_OFFSET;



	ap->ioaddr.bmdma_addr		= base;



	ata_port_desc(ap, "cmd 0x%lx ctl 0x%lx",

		      (unsigned long)base + BK3710_TF_OFFSET,

		      (unsigned long)base + BK3710_CTL_OFFSET);



	/* activate */

	return ata_host_activate(host, irq, ata_sff_interrupt, 0,

				 &pata_bk3710_sht);

}



/* work with hotplug and coldplug */

MODULE_ALIAS("platform:palm_bk3710");



static struct platform_driver pata_bk3710_driver = {

	.driver = {

		.name = "palm_bk3710",

	},

};



static int __init pata_bk3710_init(void)

{

	return platform_driver_probe(&pata_bk3710_driver, pata_bk3710_probe);

}



module_init(pata_bk3710_init);

MODULE_LICENSE("GPL");

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