drivers/ata/ahci_sunxi.c

   1 /*
   2  * Allwinner sunxi AHCI SATA platform driver
   3  * Copyright 2013 Olliver Schinagl <oliver@schinagl.nl>
   4  * Copyright 2014 Hans de Goede <hdegoede@redhat.com>
   5  *
   6  * based on the AHCI SATA platform driver by Jeff Garzik and Anton Vorontsov
   7  * Based on code from Allwinner Technology Co., Ltd. <www.allwinnertech.com>,
   8  * Daniel Wang <danielwang@allwinnertech.com>
   9  *
  10  * This program is free software; you can redistribute it and/or modify it
  11  * under the terms and conditions of the GNU General Public License,
  12  * version 2, as published by the Free Software Foundation.
  13  *
  14  * This program is distributed in the hope it will be useful, but WITHOUT
  15  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  16  * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
  17  * more details.
  18  */
  19
  20 #include <linux/ahci_platform.h>
  21 #include <linux/clk.h>
  22 #include <linux/errno.h>
  23 #include <linux/kernel.h>
  24 #include <linux/module.h>
  25 #include <linux/of_device.h>
  26 #include <linux/platform_device.h>
  27 #include <linux/regulator/consumer.h>
  28 #include "ahci.h"
  29
  30 #define DRV_NAME "ahci-sunxi"
  31
  32 /* Insmod parameters */
  33 static bool enable_pmp;
  34 module_param(enable_pmp, bool, 0);
  35 MODULE_PARM_DESC(enable_pmp,
  36         "Enable support for sata port multipliers, only use if you use a pmp!");
  37
  38 #define AHCI_BISTAFR    0x00a0
  39 #define AHCI_BISTCR     0x00a4
  40 #define AHCI_BISTFCTR   0x00a8
  41 #define AHCI_BISTSR     0x00ac
  42 #define AHCI_BISTDECR   0x00b0
  43 #define AHCI_DIAGNR0    0x00b4
  44 #define AHCI_DIAGNR1    0x00b8
  45 #define AHCI_OOBR       0x00bc
  46 #define AHCI_PHYCS0R    0x00c0
  47 #define AHCI_PHYCS1R    0x00c4
  48 #define AHCI_PHYCS2R    0x00c8
  49 #define AHCI_TIMER1MS   0x00e0
  50 #define AHCI_GPARAM1R   0x00e8
  51 #define AHCI_GPARAM2R   0x00ec
  52 #define AHCI_PPARAMR    0x00f0
  53 #define AHCI_TESTR      0x00f4
  54 #define AHCI_VERSIONR   0x00f8
  55 #define AHCI_IDR        0x00fc
  56 #define AHCI_RWCR       0x00fc
  57 #define AHCI_P0DMACR    0x0170
  58 #define AHCI_P0PHYCR    0x0178
  59 #define AHCI_P0PHYSR    0x017c
  60
  61 static void sunxi_clrbits(void __iomem *reg, u32 clr_val)
  62 {
  63         u32 reg_val;
  64
  65         reg_val = readl(reg);
  66         reg_val &= ~(clr_val);
  67         writel(reg_val, reg);
  68 }
  69
  70 static void sunxi_setbits(void __iomem *reg, u32 set_val)
  71 {
  72         u32 reg_val;
  73
  74         reg_val = readl(reg);
  75         reg_val |= set_val;
  76         writel(reg_val, reg);
  77 }
  78
  79 static void sunxi_clrsetbits(void __iomem *reg, u32 clr_val, u32 set_val)
  80 {
  81         u32 reg_val;
  82
  83         reg_val = readl(reg);
  84         reg_val &= ~(clr_val);
  85         reg_val |= set_val;
  86         writel(reg_val, reg);
  87 }
  88
  89 static u32 sunxi_getbits(void __iomem *reg, u8 mask, u8 shift)
  90 {
  91         return (readl(reg) >> shift) & mask;
  92 }
  93
  94 static int ahci_sunxi_phy_init(struct device *dev, void __iomem *reg_base)
  95 {
  96         u32 reg_val;
  97         int timeout;
  98
  99         /* This magic is from the original code */
 100         writel(0, reg_base + AHCI_RWCR);
 101         msleep(5);
 102
 103         sunxi_setbits(reg_base + AHCI_PHYCS1R, BIT(19));
 104         sunxi_clrsetbits(reg_base + AHCI_PHYCS0R,
 105                          (0x7 << 24),
 106                          (0x5 << 24) | BIT(23) | BIT(18));
 107         sunxi_clrsetbits(reg_base + AHCI_PHYCS1R,
 108                          (0x3 << 16) | (0x1f << 8) | (0x3 << 6),
 109                          (0x2 << 16) | (0x6 << 8) | (0x2 << 6));
 110         sunxi_setbits(reg_base + AHCI_PHYCS1R, BIT(28) | BIT(15));
 111         sunxi_clrbits(reg_base + AHCI_PHYCS1R, BIT(19));
 112         sunxi_clrsetbits(reg_base + AHCI_PHYCS0R,
 113                          (0x7 << 20), (0x3 << 20));
 114         sunxi_clrsetbits(reg_base + AHCI_PHYCS2R,
 115                          (0x1f << 5), (0x19 << 5));
 116         msleep(5);
 117
 118         sunxi_setbits(reg_base + AHCI_PHYCS0R, (0x1 << 19));
 119
 120         timeout = 250; /* Power up takes aprox 50 us */
 121         do {
 122                 reg_val = sunxi_getbits(reg_base + AHCI_PHYCS0R, 0x7, 28);
 123                 if (reg_val == 0x02)
 124                         break;
 125
 126                 if (--timeout == 0) {
 127                         dev_err(dev, "PHY power up failed.\n");
 128                         return -EIO;
 129                 }
 130                 udelay(1);
 131         } while (1);
 132
 133         sunxi_setbits(reg_base + AHCI_PHYCS2R, (0x1 << 24));
 134
 135         timeout = 100; /* Calibration takes aprox 10 us */
 136         do {
 137                 reg_val = sunxi_getbits(reg_base + AHCI_PHYCS2R, 0x1, 24);
 138                 if (reg_val == 0x00)
 139                         break;
 140
 141                 if (--timeout == 0) {
 142                         dev_err(dev, "PHY calibration failed.\n");
 143                         return -EIO;
 144                 }
 145                 udelay(1);
 146         } while (1);
 147
 148         msleep(15);
 149
 150         writel(0x7, reg_base + AHCI_RWCR);
 151
 152         return 0;
 153 }
 154
 155 static void ahci_sunxi_start_engine(struct ata_port *ap)
 156 {
 157         void __iomem *port_mmio = ahci_port_base(ap);
 158         struct ahci_host_priv *hpriv = ap->host->private_data;
 159
 160         /* Setup DMA before DMA start */
 161         sunxi_clrsetbits(hpriv->mmio + AHCI_P0DMACR, 0x0000ff00, 0x00004400);
 162
 163         /* Start DMA */
 164         sunxi_setbits(port_mmio + PORT_CMD, PORT_CMD_START);
 165 }
 166
 167 static const struct ata_port_info ahci_sunxi_port_info = {
 168         .flags          = AHCI_FLAG_COMMON | ATA_FLAG_NCQ,
 169         .pio_mask       = ATA_PIO4,
 170         .udma_mask      = ATA_UDMA6,
 171         .port_ops       = &ahci_platform_ops,
 172 };
 173
 174 static struct scsi_host_template ahci_platform_sht = {
 175         AHCI_SHT(DRV_NAME),
 176 };
 177
 178 static int ahci_sunxi_probe(struct platform_device *pdev)
 179 {
 180         struct device *dev = &pdev->dev;
 181         struct ahci_host_priv *hpriv;
 182         int rc;
 183
 184         hpriv = ahci_platform_get_resources(pdev, 0);
 185         if (IS_ERR(hpriv))
 186                 return PTR_ERR(hpriv);
 187
 188         hpriv->start_engine = ahci_sunxi_start_engine;
 189
 190         rc = ahci_platform_enable_resources(hpriv);
 191         if (rc)
 192                 return rc;
 193
 194         rc = ahci_sunxi_phy_init(dev, hpriv->mmio);
 195         if (rc)
 196                 goto disable_resources;
 197
 198         hpriv->flags = AHCI_HFLAG_32BIT_ONLY | AHCI_HFLAG_NO_MSI |
 199                        AHCI_HFLAG_YES_NCQ;
 200
 201         /*
 202          * The sunxi sata controller seems to be unable to successfully do a
 203          * soft reset if no pmp is attached, so disable pmp use unless
 204          * requested, otherwise directly attached disks do not work.
 205          */
 206         if (!enable_pmp)
 207                 hpriv->flags |= AHCI_HFLAG_NO_PMP;
 208
 209         rc = ahci_platform_init_host(pdev, hpriv, &ahci_sunxi_port_info,
 210                                      &ahci_platform_sht);
 211         if (rc)
 212                 goto disable_resources;
 213
 214         return 0;
 215
 216 disable_resources:
 217         ahci_platform_disable_resources(hpriv);
 218         return rc;
 219 }
 220
 221 #ifdef CONFIG_PM_SLEEP
 222 static int ahci_sunxi_resume(struct device *dev)
 223 {
 224         struct ata_host *host = dev_get_drvdata(dev);
 225         struct ahci_host_priv *hpriv = host->private_data;
 226         int rc;
 227
 228         rc = ahci_platform_enable_resources(hpriv);
 229         if (rc)
 230                 return rc;
 231
 232         rc = ahci_sunxi_phy_init(dev, hpriv->mmio);
 233         if (rc)
 234                 goto disable_resources;
 235
 236         rc = ahci_platform_resume_host(dev);
 237         if (rc)
 238                 goto disable_resources;
 239
 240         return 0;
 241
 242 disable_resources:
 243         ahci_platform_disable_resources(hpriv);
 244         return rc;
 245 }
 246 #endif
 247
 248 static SIMPLE_DEV_PM_OPS(ahci_sunxi_pm_ops, ahci_platform_suspend,
 249                          ahci_sunxi_resume);
 250
 251 static const struct of_device_id ahci_sunxi_of_match[] = {
 252         { .compatible = "allwinner,sun4i-a10-ahci", },
 253         { },
 254 };
 255 MODULE_DEVICE_TABLE(of, ahci_sunxi_of_match);
 256
 257 static struct platform_driver ahci_sunxi_driver = {
 258         .probe = ahci_sunxi_probe,
 259         .remove = ata_platform_remove_one,
 260         .driver = {
 261                 .name = DRV_NAME,
 262                 .of_match_table = ahci_sunxi_of_match,
 263                 .pm = &ahci_sunxi_pm_ops,
 264         },
 265 };
 266 module_platform_driver(ahci_sunxi_driver);
 267
 268 MODULE_DESCRIPTION("Allwinner sunxi AHCI SATA driver");
 269 MODULE_AUTHOR("Olliver Schinagl <oliver@schinagl.nl>");
 270 MODULE_LICENSE("GPL");