1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Allwinner sunxi AHCI SATA platform driver 4 * Copyright 2013 Olliver Schinagl <oliver@schinagl.nl> 5 * Copyright 2014 Hans de Goede <hdegoede@redhat.com> 6 * 7 * based on the AHCI SATA platform driver by Jeff Garzik and Anton Vorontsov 8 * Based on code from Allwinner Technology Co., Ltd. <www.allwinnertech.com>, 9 * Daniel Wang <danielwang@allwinnertech.com> 10 */ 11 12 #include <linux/ahci_platform.h> 13 #include <linux/clk.h> 14 #include <linux/errno.h> 15 #include <linux/kernel.h> 16 #include <linux/module.h> 17 #include <linux/of_device.h> 18 #include <linux/platform_device.h> 19 #include <linux/regulator/consumer.h> 20 #include "ahci.h" 21 22 #define DRV_NAME "ahci-sunxi" 23 24 /* Insmod parameters */ 25 static bool enable_pmp; 26 module_param(enable_pmp, bool, 0); 27 MODULE_PARM_DESC(enable_pmp, 28 "Enable support for sata port multipliers, only use if you use a pmp!"); 29 30 #define AHCI_BISTAFR 0x00a0 31 #define AHCI_BISTCR 0x00a4 32 #define AHCI_BISTFCTR 0x00a8 33 #define AHCI_BISTSR 0x00ac 34 #define AHCI_BISTDECR 0x00b0 35 #define AHCI_DIAGNR0 0x00b4 36 #define AHCI_DIAGNR1 0x00b8 37 #define AHCI_OOBR 0x00bc 38 #define AHCI_PHYCS0R 0x00c0 39 #define AHCI_PHYCS1R 0x00c4 40 #define AHCI_PHYCS2R 0x00c8 41 #define AHCI_TIMER1MS 0x00e0 42 #define AHCI_GPARAM1R 0x00e8 43 #define AHCI_GPARAM2R 0x00ec 44 #define AHCI_PPARAMR 0x00f0 45 #define AHCI_TESTR 0x00f4 46 #define AHCI_VERSIONR 0x00f8 47 #define AHCI_IDR 0x00fc 48 #define AHCI_RWCR 0x00fc 49 #define AHCI_P0DMACR 0x0170 50 #define AHCI_P0PHYCR 0x0178 51 #define AHCI_P0PHYSR 0x017c 52 53 static void sunxi_clrbits(void __iomem *reg, u32 clr_val) 54 { 55 u32 reg_val; 56 57 reg_val = readl(reg); 58 reg_val &= ~(clr_val); 59 writel(reg_val, reg); 60 } 61 62 static void sunxi_setbits(void __iomem *reg, u32 set_val) 63 { 64 u32 reg_val; 65 66 reg_val = readl(reg); 67 reg_val |= set_val; 68 writel(reg_val, reg); 69 } 70 71 static void sunxi_clrsetbits(void __iomem *reg, u32 clr_val, u32 set_val) 72 { 73 u32 reg_val; 74 75 reg_val = readl(reg); 76 reg_val &= ~(clr_val); 77 reg_val |= set_val; 78 writel(reg_val, reg); 79 } 80 81 static u32 sunxi_getbits(void __iomem *reg, u8 mask, u8 shift) 82 { 83 return (readl(reg) >> shift) & mask; 84 } 85 86 static int ahci_sunxi_phy_init(struct device *dev, void __iomem *reg_base) 87 { 88 u32 reg_val; 89 int timeout; 90 91 /* This magic is from the original code */ 92 writel(0, reg_base + AHCI_RWCR); 93 msleep(5); 94 95 sunxi_setbits(reg_base + AHCI_PHYCS1R, BIT(19)); 96 sunxi_clrsetbits(reg_base + AHCI_PHYCS0R, 97 (0x7 << 24), 98 (0x5 << 24) | BIT(23) | BIT(18)); 99 sunxi_clrsetbits(reg_base + AHCI_PHYCS1R, 100 (0x3 << 16) | (0x1f << 8) | (0x3 << 6), 101 (0x2 << 16) | (0x6 << 8) | (0x2 << 6)); 102 sunxi_setbits(reg_base + AHCI_PHYCS1R, BIT(28) | BIT(15)); 103 sunxi_clrbits(reg_base + AHCI_PHYCS1R, BIT(19)); 104 sunxi_clrsetbits(reg_base + AHCI_PHYCS0R, 105 (0x7 << 20), (0x3 << 20)); 106 sunxi_clrsetbits(reg_base + AHCI_PHYCS2R, 107 (0x1f << 5), (0x19 << 5)); 108 msleep(5); 109 110 sunxi_setbits(reg_base + AHCI_PHYCS0R, (0x1 << 19)); 111 112 timeout = 250; /* Power up takes aprox 50 us */ 113 do { 114 reg_val = sunxi_getbits(reg_base + AHCI_PHYCS0R, 0x7, 28); 115 if (reg_val == 0x02) 116 break; 117 118 if (--timeout == 0) { 119 dev_err(dev, "PHY power up failed.\n"); 120 return -EIO; 121 } 122 udelay(1); 123 } while (1); 124 125 sunxi_setbits(reg_base + AHCI_PHYCS2R, (0x1 << 24)); 126 127 timeout = 100; /* Calibration takes aprox 10 us */ 128 do { 129 reg_val = sunxi_getbits(reg_base + AHCI_PHYCS2R, 0x1, 24); 130 if (reg_val == 0x00) 131 break; 132 133 if (--timeout == 0) { 134 dev_err(dev, "PHY calibration failed.\n"); 135 return -EIO; 136 } 137 udelay(1); 138 } while (1); 139 140 msleep(15); 141 142 writel(0x7, reg_base + AHCI_RWCR); 143 144 return 0; 145 } 146 147 static void ahci_sunxi_start_engine(struct ata_port *ap) 148 { 149 void __iomem *port_mmio = ahci_port_base(ap); 150 struct ahci_host_priv *hpriv = ap->host->private_data; 151 152 /* Setup DMA before DMA start 153 * 154 * NOTE: A similar SoC with SATA/AHCI by Texas Instruments documents 155 * this Vendor Specific Port (P0DMACR, aka PxDMACR) in its 156 * User's Guide document (TMS320C674x/OMAP-L1x Processor 157 * Serial ATA (SATA) Controller, Literature Number: SPRUGJ8C, 158 * March 2011, Chapter 4.33 Port DMA Control Register (P0DMACR), 159 * p.68, https://www.ti.com/lit/ug/sprugj8c/sprugj8c.pdf) 160 * as equivalent to the following struct: 161 * 162 * struct AHCI_P0DMACR_t 163 * { 164 * unsigned TXTS : 4; 165 * unsigned RXTS : 4; 166 * unsigned TXABL : 4; 167 * unsigned RXABL : 4; 168 * unsigned Reserved : 16; 169 * }; 170 * 171 * TXTS: Transmit Transaction Size (TX_TRANSACTION_SIZE). 172 * This field defines the DMA transaction size in DWORDs for 173 * transmit (system bus read, device write) operation. [...] 174 * 175 * RXTS: Receive Transaction Size (RX_TRANSACTION_SIZE). 176 * This field defines the Port DMA transaction size in DWORDs 177 * for receive (system bus write, device read) operation. [...] 178 * 179 * TXABL: Transmit Burst Limit. 180 * This field allows software to limit the VBUSP master read 181 * burst size. [...] 182 * 183 * RXABL: Receive Burst Limit. 184 * Allows software to limit the VBUSP master write burst 185 * size. [...] 186 * 187 * Reserved: Reserved. 188 * 189 * 190 * NOTE: According to the above document, the following alternative 191 * to the code below could perhaps be a better option 192 * (or preparation) for possible further improvements later: 193 * sunxi_clrsetbits(hpriv->mmio + AHCI_P0DMACR, 0x0000ffff, 194 * 0x00000033); 195 */ 196 sunxi_clrsetbits(hpriv->mmio + AHCI_P0DMACR, 0x0000ffff, 0x00004433); 197 198 /* Start DMA */ 199 sunxi_setbits(port_mmio + PORT_CMD, PORT_CMD_START); 200 } 201 202 static const struct ata_port_info ahci_sunxi_port_info = { 203 .flags = AHCI_FLAG_COMMON | ATA_FLAG_NCQ | ATA_FLAG_NO_DIPM, 204 .pio_mask = ATA_PIO4, 205 .udma_mask = ATA_UDMA6, 206 .port_ops = &ahci_platform_ops, 207 }; 208 209 static struct scsi_host_template ahci_platform_sht = { 210 AHCI_SHT(DRV_NAME), 211 }; 212 213 static int ahci_sunxi_probe(struct platform_device *pdev) 214 { 215 struct device *dev = &pdev->dev; 216 struct ahci_host_priv *hpriv; 217 int rc; 218 219 hpriv = ahci_platform_get_resources(pdev, AHCI_PLATFORM_GET_RESETS); 220 if (IS_ERR(hpriv)) 221 return PTR_ERR(hpriv); 222 223 hpriv->start_engine = ahci_sunxi_start_engine; 224 225 rc = ahci_platform_enable_resources(hpriv); 226 if (rc) 227 return rc; 228 229 rc = ahci_sunxi_phy_init(dev, hpriv->mmio); 230 if (rc) 231 goto disable_resources; 232 233 hpriv->flags = AHCI_HFLAG_32BIT_ONLY | AHCI_HFLAG_NO_MSI | 234 AHCI_HFLAG_YES_NCQ; 235 236 /* 237 * The sunxi sata controller seems to be unable to successfully do a 238 * soft reset if no pmp is attached, so disable pmp use unless 239 * requested, otherwise directly attached disks do not work. 240 */ 241 if (!enable_pmp) 242 hpriv->flags |= AHCI_HFLAG_NO_PMP; 243 244 rc = ahci_platform_init_host(pdev, hpriv, &ahci_sunxi_port_info, 245 &ahci_platform_sht); 246 if (rc) 247 goto disable_resources; 248 249 return 0; 250 251 disable_resources: 252 ahci_platform_disable_resources(hpriv); 253 return rc; 254 } 255 256 #ifdef CONFIG_PM_SLEEP 257 static int ahci_sunxi_resume(struct device *dev) 258 { 259 struct ata_host *host = dev_get_drvdata(dev); 260 struct ahci_host_priv *hpriv = host->private_data; 261 int rc; 262 263 rc = ahci_platform_enable_resources(hpriv); 264 if (rc) 265 return rc; 266 267 rc = ahci_sunxi_phy_init(dev, hpriv->mmio); 268 if (rc) 269 goto disable_resources; 270 271 rc = ahci_platform_resume_host(dev); 272 if (rc) 273 goto disable_resources; 274 275 return 0; 276 277 disable_resources: 278 ahci_platform_disable_resources(hpriv); 279 return rc; 280 } 281 #endif 282 283 static SIMPLE_DEV_PM_OPS(ahci_sunxi_pm_ops, ahci_platform_suspend, 284 ahci_sunxi_resume); 285 286 static const struct of_device_id ahci_sunxi_of_match[] = { 287 { .compatible = "allwinner,sun4i-a10-ahci", }, 288 { .compatible = "allwinner,sun8i-r40-ahci", }, 289 { }, 290 }; 291 MODULE_DEVICE_TABLE(of, ahci_sunxi_of_match); 292 293 static struct platform_driver ahci_sunxi_driver = { 294 .probe = ahci_sunxi_probe, 295 .remove = ata_platform_remove_one, 296 .driver = { 297 .name = DRV_NAME, 298 .of_match_table = ahci_sunxi_of_match, 299 .pm = &ahci_sunxi_pm_ops, 300 }, 301 }; 302 module_platform_driver(ahci_sunxi_driver); 303 304 MODULE_DESCRIPTION("Allwinner sunxi AHCI SATA driver"); 305 MODULE_AUTHOR("Olliver Schinagl <oliver@schinagl.nl>"); 306 MODULE_LICENSE("GPL"); 307