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Release 4.14 drivers/ata/pata_bk3710.c

Directory: drivers/ata
/*
 * 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); }

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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); }

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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); }

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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); }

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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); }

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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); }

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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); }

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/* 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); }

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module_init(pata_bk3710_init); MODULE_LICENSE("GPL");

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Directory: drivers/ata
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