Date:   Wed, 19 Oct 2022 17:29:37 +0200
From:   Arnd Bergmann <arnd@...nel.org>
To:     Sekhar Nori <nsekhar@...com>, Bartosz Golaszewski <brgl@...ev.pl>,
        linux-arm-kernel@...ts.infradead.org,
        Damien Le Moal <damien.lemoal@...nsource.wdc.com>
Cc:     linux-kernel@...r.kernel.org, Kevin Hilman <khilman@...libre.com>,
        Arnd Bergmann <arnd@...db.de>,
        Sergey Shtylyov <s.shtylyov@....ru>,
        Hannes Reinecke <hare@...e.de>, linux-ide@...r.kernel.org
Subject: [PATCH 11/14] pata: remove palmchip bk3710 driver

From: Arnd Bergmann <arnd@...db.de>

This device was used only on the davinci dm644x platform that
is now gone, and no references to the device remain in the
kernel.

Signed-off-by: Arnd Bergmann <arnd@...db.de>
---
 drivers/ata/Kconfig       |  10 -
 drivers/ata/Makefile      |   1 -
 drivers/ata/pata_bk3710.c | 380 --------------------------------------
 3 files changed, 391 deletions(-)
 delete mode 100644 drivers/ata/pata_bk3710.c

diff --git a/drivers/ata/Kconfig b/drivers/ata/Kconfig
index 36833a862998..2986fc9c797e 100644
--- a/drivers/ata/Kconfig
+++ b/drivers/ata/Kconfig
@@ -609,16 +609,6 @@ config PATA_ATP867X
 
 	  If unsure, say N.
 
-config PATA_BK3710
-	tristate "Palmchip BK3710 PATA support"
-	depends on ARCH_DAVINCI || COMPILE_TEST
-	select PATA_TIMINGS
-	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
diff --git a/drivers/ata/Makefile b/drivers/ata/Makefile
index 34623365d9a6..d2e36d367274 100644
--- a/drivers/ata/Makefile
+++ b/drivers/ata/Makefile
@@ -54,7 +54,6 @@ obj-$(CONFIG_PATA_AMD)		+= pata_amd.o
 obj-$(CONFIG_PATA_ARTOP)	+= pata_artop.o
 obj-$(CONFIG_PATA_ATIIXP)	+= pata_atiixp.o
 obj-$(CONFIG_PATA_ATP867X)	+= pata_atp867x.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
diff --git a/drivers/ata/pata_bk3710.c b/drivers/ata/pata_bk3710.c
deleted file mode 100644
index fad95cfecced..000000000000
--- a/drivers/ata/pata_bk3710.c
+++ /dev/null
@@ -1,380 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0
-
-/*
- * 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@...sta.com>
- */
-
-#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 v2");
-- 
2.29.2

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