drivers/ata/pata_bk3710.c

   1 // SPDX-License-Identifier: GPL-2.0
   2
   3 /*
   4  * Palmchip BK3710 PATA controller driver
   5  *
   6  * Copyright (c) 2017 Samsung Electronics Co., Ltd.
   7  *              http://www.samsung.com
   8  *
   9  * Based on palm_bk3710.c:
  10  *
  11  * Copyright (C) 2006 Texas Instruments.
  12  * Copyright (C) 2007 MontaVista Software, Inc., <source@mvista.com>
  13  */
  14
  15 #include <linux/ata.h>
  16 #include <linux/clk.h>
  17 #include <linux/delay.h>
  18 #include <linux/init.h>
  19 #include <linux/ioport.h>
  20 #include <linux/kernel.h>
  21 #include <linux/libata.h>
  22 #include <linux/module.h>
  23 #include <linux/platform_device.h>
  24 #include <linux/types.h>
  25
  26 #define DRV_NAME "pata_bk3710"
  27
  28 #define BK3710_TF_OFFSET        0x1F0
  29 #define BK3710_CTL_OFFSET       0x3F6
  30
  31 #define BK3710_BMISP            0x02
  32 #define BK3710_IDETIMP          0x40
  33 #define BK3710_UDMACTL          0x48
  34 #define BK3710_MISCCTL          0x50
  35 #define BK3710_REGSTB           0x54
  36 #define BK3710_REGRCVR          0x58
  37 #define BK3710_DATSTB           0x5C
  38 #define BK3710_DATRCVR          0x60
  39 #define BK3710_DMASTB           0x64
  40 #define BK3710_DMARCVR          0x68
  41 #define BK3710_UDMASTB          0x6C
  42 #define BK3710_UDMATRP          0x70
  43 #define BK3710_UDMAENV          0x74
  44 #define BK3710_IORDYTMP         0x78
  45
  46 static struct scsi_host_template pata_bk3710_sht = {
  47         ATA_BMDMA_SHT(DRV_NAME),
  48 };
  49
  50 static unsigned int ideclk_period; /* in nanoseconds */
  51
  52 struct pata_bk3710_udmatiming {
  53         unsigned int rptime;    /* tRP -- Ready to pause time (nsec) */
  54         unsigned int cycletime; /* tCYCTYP2/2 -- avg Cycle Time (nsec) */
  55                                 /* tENV is always a minimum of 20 nsec */
  56 };
  57
  58 static const struct pata_bk3710_udmatiming pata_bk3710_udmatimings[6] = {
  59         { 160, 240 / 2 },       /* UDMA Mode 0 */
  60         { 125, 160 / 2 },       /* UDMA Mode 1 */
  61         { 100, 120 / 2 },       /* UDMA Mode 2 */
  62         { 100,  90 / 2 },       /* UDMA Mode 3 */
  63         { 100,  60 / 2 },       /* UDMA Mode 4 */
  64         {  85,  40 / 2 },       /* UDMA Mode 5 */
  65 };
  66
  67 static void pata_bk3710_setudmamode(void __iomem *base, unsigned int dev,
  68                                     unsigned int mode)
  69 {
  70         u32 val32;
  71         u16 val16;
  72         u8 tenv, trp, t0;
  73
  74         /* DMA Data Setup */
  75         t0 = DIV_ROUND_UP(pata_bk3710_udmatimings[mode].cycletime,
  76                           ideclk_period) - 1;
  77         tenv = DIV_ROUND_UP(20, ideclk_period) - 1;
  78         trp = DIV_ROUND_UP(pata_bk3710_udmatimings[mode].rptime,
  79                            ideclk_period) - 1;
  80
  81         /* udmastb Ultra DMA Access Strobe Width */
  82         val32 = ioread32(base + BK3710_UDMASTB) & (0xFF << (dev ? 0 : 8));
  83         val32 |= t0 << (dev ? 8 : 0);
  84         iowrite32(val32, base + BK3710_UDMASTB);
  85
  86         /* udmatrp Ultra DMA Ready to Pause Time */
  87         val32 = ioread32(base + BK3710_UDMATRP) & (0xFF << (dev ? 0 : 8));
  88         val32 |= trp << (dev ? 8 : 0);
  89         iowrite32(val32, base + BK3710_UDMATRP);
  90
  91         /* udmaenv Ultra DMA envelop Time */
  92         val32 = ioread32(base + BK3710_UDMAENV) & (0xFF << (dev ? 0 : 8));
  93         val32 |= tenv << (dev ? 8 : 0);
  94         iowrite32(val32, base + BK3710_UDMAENV);
  95
  96         /* Enable UDMA for Device */
  97         val16 = ioread16(base + BK3710_UDMACTL) | (1 << dev);
  98         iowrite16(val16, base + BK3710_UDMACTL);
  99 }
 100
 101 static void pata_bk3710_setmwdmamode(void __iomem *base, unsigned int dev,
 102                                      unsigned short min_cycle,
 103                                      unsigned int mode)
 104 {
 105         const struct ata_timing *t;
 106         int cycletime;
 107         u32 val32;
 108         u16 val16;
 109         u8 td, tkw, t0;
 110
 111         t = ata_timing_find_mode(mode);
 112         cycletime = max_t(int, t->cycle, min_cycle);
 113
 114         /* DMA Data Setup */
 115         t0 = DIV_ROUND_UP(cycletime, ideclk_period);
 116         td = DIV_ROUND_UP(t->active, ideclk_period);
 117         tkw = t0 - td - 1;
 118         td--;
 119
 120         val32 = ioread32(base + BK3710_DMASTB) & (0xFF << (dev ? 0 : 8));
 121         val32 |= td << (dev ? 8 : 0);
 122         iowrite32(val32, base + BK3710_DMASTB);
 123
 124         val32 = ioread32(base + BK3710_DMARCVR) & (0xFF << (dev ? 0 : 8));
 125         val32 |= tkw << (dev ? 8 : 0);
 126         iowrite32(val32, base + BK3710_DMARCVR);
 127
 128         /* Disable UDMA for Device */
 129         val16 = ioread16(base + BK3710_UDMACTL) & ~(1 << dev);
 130         iowrite16(val16, base + BK3710_UDMACTL);
 131 }
 132
 133 static void pata_bk3710_set_dmamode(struct ata_port *ap,
 134                                     struct ata_device *adev)
 135 {
 136         void __iomem *base = (void __iomem *)ap->ioaddr.bmdma_addr;
 137         int is_slave = adev->devno;
 138         const u8 xferspeed = adev->dma_mode;
 139
 140         if (xferspeed >= XFER_UDMA_0)
 141                 pata_bk3710_setudmamode(base, is_slave,
 142                                         xferspeed - XFER_UDMA_0);
 143         else
 144                 pata_bk3710_setmwdmamode(base, is_slave,
 145                                          adev->id[ATA_ID_EIDE_DMA_MIN],
 146                                          xferspeed);
 147 }
 148
 149 static void pata_bk3710_setpiomode(void __iomem *base, struct ata_device *pair,
 150                                    unsigned int dev, unsigned int cycletime,
 151                                    unsigned int mode)
 152 {
 153         const struct ata_timing *t;
 154         u32 val32;
 155         u8 t2, t2i, t0;
 156
 157         t = ata_timing_find_mode(XFER_PIO_0 + mode);
 158
 159         /* PIO Data Setup */
 160         t0 = DIV_ROUND_UP(cycletime, ideclk_period);
 161         t2 = DIV_ROUND_UP(t->active, ideclk_period);
 162
 163         t2i = t0 - t2 - 1;
 164         t2--;
 165
 166         val32 = ioread32(base + BK3710_DATSTB) & (0xFF << (dev ? 0 : 8));
 167         val32 |= t2 << (dev ? 8 : 0);
 168         iowrite32(val32, base + BK3710_DATSTB);
 169
 170         val32 = ioread32(base + BK3710_DATRCVR) & (0xFF << (dev ? 0 : 8));
 171         val32 |= t2i << (dev ? 8 : 0);
 172         iowrite32(val32, base + BK3710_DATRCVR);
 173
 174         /* FIXME: this is broken also in the old driver */
 175         if (pair) {
 176                 u8 mode2 = pair->pio_mode - XFER_PIO_0;
 177
 178                 if (mode2 < mode)
 179                         mode = mode2;
 180         }
 181
 182         /* TASKFILE Setup */
 183         t0 = DIV_ROUND_UP(t->cyc8b, ideclk_period);
 184         t2 = DIV_ROUND_UP(t->act8b, ideclk_period);
 185
 186         t2i = t0 - t2 - 1;
 187         t2--;
 188
 189         val32 = ioread32(base + BK3710_REGSTB) & (0xFF << (dev ? 0 : 8));
 190         val32 |= t2 << (dev ? 8 : 0);
 191         iowrite32(val32, base + BK3710_REGSTB);
 192
 193         val32 = ioread32(base + BK3710_REGRCVR) & (0xFF << (dev ? 0 : 8));
 194         val32 |= t2i << (dev ? 8 : 0);
 195         iowrite32(val32, base + BK3710_REGRCVR);
 196 }
 197
 198 static void pata_bk3710_set_piomode(struct ata_port *ap,
 199                                     struct ata_device *adev)
 200 {
 201         void __iomem *base = (void __iomem *)ap->ioaddr.bmdma_addr;
 202         struct ata_device *pair = ata_dev_pair(adev);
 203         const struct ata_timing *t = ata_timing_find_mode(adev->pio_mode);
 204         const u16 *id = adev->id;
 205         unsigned int cycle_time = 0;
 206         int is_slave = adev->devno;
 207         const u8 pio = adev->pio_mode - XFER_PIO_0;
 208
 209         if (id[ATA_ID_FIELD_VALID] & 2) {
 210                 if (ata_id_has_iordy(id))
 211                         cycle_time = id[ATA_ID_EIDE_PIO_IORDY];
 212                 else
 213                         cycle_time = id[ATA_ID_EIDE_PIO];
 214
 215                 /* conservative "downgrade" for all pre-ATA2 drives */
 216                 if (pio < 3 && cycle_time < t->cycle)
 217                         cycle_time = 0; /* use standard timing */
 218         }
 219
 220         if (!cycle_time)
 221                 cycle_time = t->cycle;
 222
 223         pata_bk3710_setpiomode(base, pair, is_slave, cycle_time, pio);
 224 }
 225
 226 static void pata_bk3710_chipinit(void __iomem *base)
 227 {
 228         /*
 229          * REVISIT:  the ATA reset signal needs to be managed through a
 230          * GPIO, which means it should come from platform_data.  Until
 231          * we get and use such information, we have to trust that things
 232          * have been reset before we get here.
 233          */
 234
 235         /*
 236          * Program the IDETIMP Register Value based on the following assumptions
 237          *
 238          * (ATA_IDETIMP_IDEEN           , ENABLE ) |
 239          * (ATA_IDETIMP_PREPOST1        , DISABLE) |
 240          * (ATA_IDETIMP_PREPOST0        , DISABLE) |
 241          *
 242          * DM6446 silicon rev 2.1 and earlier have no observed net benefit
 243          * from enabling prefetch/postwrite.
 244          */
 245         iowrite16(BIT(15), base + BK3710_IDETIMP);
 246
 247         /*
 248          * UDMACTL Ultra-ATA DMA Control
 249          * (ATA_UDMACTL_UDMAP1  , 0 ) |
 250          * (ATA_UDMACTL_UDMAP0  , 0 )
 251          *
 252          */
 253         iowrite16(0, base + BK3710_UDMACTL);
 254
 255         /*
 256          * MISCCTL Miscellaneous Conrol Register
 257          * (ATA_MISCCTL_HWNHLD1P        , 1 cycle)
 258          * (ATA_MISCCTL_HWNHLD0P        , 1 cycle)
 259          * (ATA_MISCCTL_TIMORIDE        , 1)
 260          */
 261         iowrite32(0x001, base + BK3710_MISCCTL);
 262
 263         /*
 264          * IORDYTMP IORDY Timer for Primary Register
 265          * (ATA_IORDYTMP_IORDYTMP       , DISABLE)
 266          */
 267         iowrite32(0, base + BK3710_IORDYTMP);
 268
 269         /*
 270          * Configure BMISP Register
 271          * (ATA_BMISP_DMAEN1    , DISABLE )     |
 272          * (ATA_BMISP_DMAEN0    , DISABLE )     |
 273          * (ATA_BMISP_IORDYINT  , CLEAR)        |
 274          * (ATA_BMISP_INTRSTAT  , CLEAR)        |
 275          * (ATA_BMISP_DMAERROR  , CLEAR)
 276          */
 277         iowrite16(0xE, base + BK3710_BMISP);
 278
 279         pata_bk3710_setpiomode(base, NULL, 0, 600, 0);
 280         pata_bk3710_setpiomode(base, NULL, 1, 600, 0);
 281 }
 282
 283 static struct ata_port_operations pata_bk3710_ports_ops = {
 284         .inherits               = &ata_bmdma_port_ops,
 285         .cable_detect           = ata_cable_80wire,
 286
 287         .set_piomode            = pata_bk3710_set_piomode,
 288         .set_dmamode            = pata_bk3710_set_dmamode,
 289 };
 290
 291 static int __init pata_bk3710_probe(struct platform_device *pdev)
 292 {
 293         struct clk *clk;
 294         struct resource *mem;
 295         struct ata_host *host;
 296         struct ata_port *ap;
 297         void __iomem *base;
 298         unsigned long rate;
 299         int irq;
 300
 301         clk = devm_clk_get(&pdev->dev, NULL);
 302         if (IS_ERR(clk))
 303                 return -ENODEV;
 304
 305         clk_enable(clk);
 306         rate = clk_get_rate(clk);
 307         if (!rate)
 308                 return -EINVAL;
 309
 310         /* NOTE:  round *down* to meet minimum timings; we count in clocks */
 311         ideclk_period = 1000000000UL / rate;
 312
 313         mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 314
 315         irq = platform_get_irq(pdev, 0);
 316         if (irq < 0) {
 317                 pr_err(DRV_NAME ": failed to get IRQ resource\n");
 318                 return irq;
 319         }
 320
 321         base = devm_ioremap_resource(&pdev->dev, mem);
 322         if (IS_ERR(base))
 323                 return PTR_ERR(base);
 324
 325         /* configure the Palmchip controller */
 326         pata_bk3710_chipinit(base);
 327
 328         /* allocate host */
 329         host = ata_host_alloc(&pdev->dev, 1);
 330         if (!host)
 331                 return -ENOMEM;
 332         ap = host->ports[0];
 333
 334         ap->ops = &pata_bk3710_ports_ops;
 335         ap->pio_mask = ATA_PIO4;
 336         ap->mwdma_mask = ATA_MWDMA2;
 337         ap->udma_mask = rate < 100000000 ? ATA_UDMA4 : ATA_UDMA5;
 338         ap->flags |= ATA_FLAG_SLAVE_POSS;
 339
 340         ap->ioaddr.data_addr            = base + BK3710_TF_OFFSET;
 341         ap->ioaddr.error_addr           = base + BK3710_TF_OFFSET + 1;
 342         ap->ioaddr.feature_addr         = base + BK3710_TF_OFFSET + 1;
 343         ap->ioaddr.nsect_addr           = base + BK3710_TF_OFFSET + 2;
 344         ap->ioaddr.lbal_addr            = base + BK3710_TF_OFFSET + 3;
 345         ap->ioaddr.lbam_addr            = base + BK3710_TF_OFFSET + 4;
 346         ap->ioaddr.lbah_addr            = base + BK3710_TF_OFFSET + 5;
 347         ap->ioaddr.device_addr          = base + BK3710_TF_OFFSET + 6;
 348         ap->ioaddr.status_addr          = base + BK3710_TF_OFFSET + 7;
 349         ap->ioaddr.command_addr         = base + BK3710_TF_OFFSET + 7;
 350
 351         ap->ioaddr.altstatus_addr       = base + BK3710_CTL_OFFSET;
 352         ap->ioaddr.ctl_addr             = base + BK3710_CTL_OFFSET;
 353
 354         ap->ioaddr.bmdma_addr           = base;
 355
 356         ata_port_desc(ap, "cmd 0x%lx ctl 0x%lx",
 357                       (unsigned long)base + BK3710_TF_OFFSET,
 358                       (unsigned long)base + BK3710_CTL_OFFSET);
 359
 360         /* activate */
 361         return ata_host_activate(host, irq, ata_sff_interrupt, 0,
 362                                  &pata_bk3710_sht);
 363 }
 364
 365 /* work with hotplug and coldplug */
 366 MODULE_ALIAS("platform:palm_bk3710");
 367
 368 static struct platform_driver pata_bk3710_driver = {
 369         .driver = {
 370                 .name = "palm_bk3710",
 371         },
 372 };
 373
 374 static int __init pata_bk3710_init(void)
 375 {
 376         return platform_driver_probe(&pata_bk3710_driver, pata_bk3710_probe);
 377 }
 378
 379 module_init(pata_bk3710_init);
 380 MODULE_LICENSE("GPL v2");