+++ /dev/null
-// 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@mvista.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");
git.samba.org / sfrench / cifs-2.6.git / commitdiff