a10_ahci.c revision 309753
1/*- 2 * Copyright (c) 2014-2015 M. Warner Losh <imp@freebsd.org> 3 * Copyright (c) 2015 Luiz Otavio O Souza <loos@freebsd.org> 4 * All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 18 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 25 * SUCH DAMAGE. 26 * 27 * The magic-bit-bang sequence used in this code may be based on a linux 28 * platform driver in the Allwinner SDK from Allwinner Technology Co., Ltd. 29 * www.allwinnertech.com, by Daniel Wang <danielwang@allwinnertech.com> 30 * though none of the original code was copied. 31 */ 32 33#include "opt_bus.h" 34 35#include <sys/cdefs.h> 36__FBSDID("$FreeBSD: stable/11/sys/arm/allwinner/a10_ahci.c 309753 2016-12-09 19:36:13Z manu $"); 37 38#include <sys/param.h> 39#include <sys/systm.h> 40#include <sys/bus.h> 41#include <sys/rman.h> 42#include <sys/kernel.h> 43#include <sys/module.h> 44 45#include <machine/bus.h> 46#include <dev/ofw/ofw_bus.h> 47#include <dev/ofw/ofw_bus_subr.h> 48 49#include <dev/ahci/ahci.h> 50#include <dev/extres/clk/clk.h> 51 52/* 53 * Allwinner a1x/a2x/a8x SATA attachment. This is just the AHCI register 54 * set with a few extra implementation-specific registers that need to 55 * be accounted for. There's only one PHY in the system, and it needs 56 * to be trained to bring the link up. In addition, there's some DMA 57 * specific things that need to be done as well. These things are also 58 * just about completely undocumented, except in ugly code in the Linux 59 * SDK Allwinner releases. 60 */ 61 62/* BITx -- Unknown bit that needs to be set/cleared at position x */ 63/* UFx -- Uknown multi-bit field frobbed during init */ 64#define AHCI_BISTAFR 0x00A0 65#define AHCI_BISTCR 0x00A4 66#define AHCI_BISTFCTR 0x00A8 67#define AHCI_BISTSR 0x00AC 68#define AHCI_BISTDECR 0x00B0 69#define AHCI_DIAGNR 0x00B4 70#define AHCI_DIAGNR1 0x00B8 71#define AHCI_OOBR 0x00BC 72#define AHCI_PHYCS0R 0x00C0 73/* Bits 0..17 are a mystery */ 74#define PHYCS0R_BIT18 (1 << 18) 75#define PHYCS0R_POWER_ENABLE (1 << 19) 76#define PHYCS0R_UF1_MASK (7 << 20) /* Unknown Field 1 */ 77#define PHYCS0R_UF1_INIT (3 << 20) 78#define PHYCS0R_BIT23 (1 << 23) 79#define PHYCS0R_UF2_MASK (7 << 24) /* Uknown Field 2 */ 80#define PHYCS0R_UF2_INIT (5 << 24) 81/* Bit 27 mystery */ 82#define PHYCS0R_POWER_STATUS_MASK (7 << 28) 83#define PHYCS0R_PS_GOOD (2 << 28) 84/* Bit 31 mystery */ 85#define AHCI_PHYCS1R 0x00C4 86/* Bits 0..5 are a mystery */ 87#define PHYCS1R_UF1_MASK (3 << 6) 88#define PHYCS1R_UF1_INIT (2 << 6) 89#define PHYCS1R_UF2_MASK (0x1f << 8) 90#define PHYCS1R_UF2_INIT (6 << 8) 91/* Bits 13..14 are a mystery */ 92#define PHYCS1R_BIT15 (1 << 15) 93#define PHYCS1R_UF3_MASK (3 << 16) 94#define PHYCS1R_UF3_INIT (2 << 16) 95/* Bit 18 mystery */ 96#define PHYCS1R_HIGHZ (1 << 19) 97/* Bits 20..27 mystery */ 98#define PHYCS1R_BIT28 (1 << 28) 99/* Bits 29..31 mystery */ 100#define AHCI_PHYCS2R 0x00C8 101/* bits 0..4 mystery */ 102#define PHYCS2R_UF1_MASK (0x1f << 5) 103#define PHYCS2R_UF1_INIT (0x19 << 5) 104/* Bits 10..23 mystery */ 105#define PHYCS2R_CALIBRATE (1 << 24) 106/* Bits 25..31 mystery */ 107#define AHCI_TIMER1MS 0x00E0 108#define AHCI_GPARAM1R 0x00E8 109#define AHCI_GPARAM2R 0x00EC 110#define AHCI_PPARAMR 0x00F0 111#define AHCI_TESTR 0x00F4 112#define AHCI_VERSIONR 0x00F8 113#define AHCI_IDR 0x00FC 114#define AHCI_RWCR 0x00FC 115 116#define AHCI_P0DMACR 0x0070 117#define AHCI_P0PHYCR 0x0078 118#define AHCI_P0PHYSR 0x007C 119 120#define PLL_FREQ 100000000 121 122static void inline 123ahci_set(struct resource *m, bus_size_t off, uint32_t set) 124{ 125 uint32_t val = ATA_INL(m, off); 126 127 val |= set; 128 ATA_OUTL(m, off, val); 129} 130 131static void inline 132ahci_clr(struct resource *m, bus_size_t off, uint32_t clr) 133{ 134 uint32_t val = ATA_INL(m, off); 135 136 val &= ~clr; 137 ATA_OUTL(m, off, val); 138} 139 140static void inline 141ahci_mask_set(struct resource *m, bus_size_t off, uint32_t mask, uint32_t set) 142{ 143 uint32_t val = ATA_INL(m, off); 144 145 val &= mask; 146 val |= set; 147 ATA_OUTL(m, off, val); 148} 149 150/* 151 * Should this be phy_reset or phy_init 152 */ 153#define PHY_RESET_TIMEOUT 1000 154static void 155ahci_a10_phy_reset(device_t dev) 156{ 157 uint32_t to, val; 158 struct ahci_controller *ctlr = device_get_softc(dev); 159 160 /* 161 * Here starts the magic -- most of the comments are based 162 * on guesswork, names of routines and printf error 163 * messages. The code works, but it will do that even if the 164 * comments are 100% BS. 165 */ 166 167 /* 168 * Lock out other access while we initialize. Or at least that 169 * seems to be the case based on Linux SDK #defines. Maybe this 170 * put things into reset? 171 */ 172 ATA_OUTL(ctlr->r_mem, AHCI_RWCR, 0); 173 DELAY(100); 174 175 /* 176 * Set bit 19 in PHYCS1R. Guessing this disables driving the PHY 177 * port for a bit while we reset things. 178 */ 179 ahci_set(ctlr->r_mem, AHCI_PHYCS1R, PHYCS1R_HIGHZ); 180 181 /* 182 * Frob PHYCS0R... 183 */ 184 ahci_mask_set(ctlr->r_mem, AHCI_PHYCS0R, 185 ~PHYCS0R_UF2_MASK, 186 PHYCS0R_UF2_INIT | PHYCS0R_BIT23 | PHYCS0R_BIT18); 187 188 /* 189 * Set three fields in PHYCS1R 190 */ 191 ahci_mask_set(ctlr->r_mem, AHCI_PHYCS1R, 192 ~(PHYCS1R_UF1_MASK | PHYCS1R_UF2_MASK | PHYCS1R_UF3_MASK), 193 PHYCS1R_UF1_INIT | PHYCS1R_UF2_INIT | PHYCS1R_UF3_INIT); 194 195 /* 196 * Two more mystery bits in PHYCS1R. -- can these be combined above? 197 */ 198 ahci_set(ctlr->r_mem, AHCI_PHYCS1R, PHYCS1R_BIT15 | PHYCS1R_BIT28); 199 200 /* 201 * Now clear that first mysery bit. Perhaps this starts 202 * driving the PHY again so we can power it up and start 203 * talking to the SATA drive, if any below. 204 */ 205 ahci_clr(ctlr->r_mem, AHCI_PHYCS1R, PHYCS1R_HIGHZ); 206 207 /* 208 * Frob PHYCS0R again... 209 */ 210 ahci_mask_set(ctlr->r_mem, AHCI_PHYCS0R, 211 ~PHYCS0R_UF1_MASK, PHYCS0R_UF1_INIT); 212 213 /* 214 * Frob PHYCS2R, because 25 means something? 215 */ 216 ahci_mask_set(ctlr->r_mem, AHCI_PHYCS2R, ~PHYCS2R_UF1_MASK, 217 PHYCS2R_UF1_INIT); 218 219 DELAY(100); /* WAG */ 220 221 /* 222 * Turn on the power to the PHY and wait for it to report back 223 * good? 224 */ 225 ahci_set(ctlr->r_mem, AHCI_PHYCS0R, PHYCS0R_POWER_ENABLE); 226 for (to = PHY_RESET_TIMEOUT; to > 0; to--) { 227 val = ATA_INL(ctlr->r_mem, AHCI_PHYCS0R); 228 if ((val & PHYCS0R_POWER_STATUS_MASK) == PHYCS0R_PS_GOOD) 229 break; 230 DELAY(10); 231 } 232 if (to == 0 && bootverbose) 233 device_printf(dev, "PHY Power Failed PHYCS0R = %#x\n", val); 234 235 /* 236 * Calibrate the clocks between the device and the host. This appears 237 * to be an automated process that clears the bit when it is done. 238 */ 239 ahci_set(ctlr->r_mem, AHCI_PHYCS2R, PHYCS2R_CALIBRATE); 240 for (to = PHY_RESET_TIMEOUT; to > 0; to--) { 241 val = ATA_INL(ctlr->r_mem, AHCI_PHYCS2R); 242 if ((val & PHYCS2R_CALIBRATE) == 0) 243 break; 244 DELAY(10); 245 } 246 if (to == 0 && bootverbose) 247 device_printf(dev, "PHY Cal Failed PHYCS2R %#x\n", val); 248 249 /* 250 * OK, let things settle down a bit. 251 */ 252 DELAY(1000); 253 254 /* 255 * Go back into normal mode now that we've calibrated the PHY. 256 */ 257 ATA_OUTL(ctlr->r_mem, AHCI_RWCR, 7); 258} 259 260static void 261ahci_a10_ch_start(struct ahci_channel *ch) 262{ 263 uint32_t reg; 264 265 /* 266 * Magical values from Allwinner SDK, setup the DMA before start 267 * operations on this channel. 268 */ 269 reg = ATA_INL(ch->r_mem, AHCI_P0DMACR); 270 reg &= ~0xff00; 271 reg |= 0x4400; 272 ATA_OUTL(ch->r_mem, AHCI_P0DMACR, reg); 273} 274 275static int 276ahci_a10_ctlr_reset(device_t dev) 277{ 278 279 ahci_a10_phy_reset(dev); 280 281 return (ahci_ctlr_reset(dev)); 282} 283 284static int 285ahci_a10_probe(device_t dev) 286{ 287 288 if (!ofw_bus_is_compatible(dev, "allwinner,sun4i-a10-ahci")) 289 return (ENXIO); 290 device_set_desc(dev, "Allwinner Integrated AHCI controller"); 291 292 return (BUS_PROBE_DEFAULT); 293} 294 295static int 296ahci_a10_attach(device_t dev) 297{ 298 int error; 299 struct ahci_controller *ctlr; 300 clk_t clk_pll, clk_gate; 301 302 ctlr = device_get_softc(dev); 303 clk_pll = clk_gate = NULL; 304 305 ctlr->quirks = AHCI_Q_NOPMP; 306 ctlr->vendorid = 0; 307 ctlr->deviceid = 0; 308 ctlr->subvendorid = 0; 309 ctlr->subdeviceid = 0; 310 ctlr->r_rid = 0; 311 if (!(ctlr->r_mem = bus_alloc_resource_any(dev, SYS_RES_MEMORY, 312 &ctlr->r_rid, RF_ACTIVE))) 313 return (ENXIO); 314 315 /* Enable clocks */ 316 error = clk_get_by_ofw_index(dev, 0, 0, &clk_pll); 317 if (error != 0) { 318 device_printf(dev, "Cannot get PLL clock\n"); 319 goto fail; 320 } 321 error = clk_get_by_ofw_index(dev, 0, 1, &clk_gate); 322 if (error != 0) { 323 device_printf(dev, "Cannot get gate clock\n"); 324 goto fail; 325 } 326 error = clk_set_freq(clk_pll, PLL_FREQ, CLK_SET_ROUND_DOWN); 327 if (error != 0) { 328 device_printf(dev, "Cannot set PLL frequency\n"); 329 goto fail; 330 } 331 error = clk_enable(clk_pll); 332 if (error != 0) { 333 device_printf(dev, "Cannot enable PLL\n"); 334 goto fail; 335 } 336 error = clk_enable(clk_gate); 337 if (error != 0) { 338 device_printf(dev, "Cannot enable clk gate\n"); 339 goto fail; 340 } 341 342 /* Reset controller */ 343 if ((error = ahci_a10_ctlr_reset(dev)) != 0) 344 goto fail; 345 346 /* 347 * No MSI registers on this platform. 348 */ 349 ctlr->msi = 0; 350 ctlr->numirqs = 1; 351 352 /* Channel start callback(). */ 353 ctlr->ch_start = ahci_a10_ch_start; 354 355 /* 356 * Note: ahci_attach will release ctlr->r_mem on errors automatically 357 */ 358 return (ahci_attach(dev)); 359 360fail: 361 if (clk_gate != NULL) 362 clk_release(clk_gate); 363 if (clk_pll != NULL) 364 clk_release(clk_pll); 365 bus_release_resource(dev, SYS_RES_MEMORY, ctlr->r_rid, ctlr->r_mem); 366 return (error); 367} 368 369static int 370ahci_a10_detach(device_t dev) 371{ 372 373 return (ahci_detach(dev)); 374} 375 376static devclass_t ahci_devclass; 377 378static device_method_t ahci_ata_methods[] = { 379 DEVMETHOD(device_probe, ahci_a10_probe), 380 DEVMETHOD(device_attach, ahci_a10_attach), 381 DEVMETHOD(device_detach, ahci_a10_detach), 382 DEVMETHOD(bus_print_child, ahci_print_child), 383 DEVMETHOD(bus_alloc_resource, ahci_alloc_resource), 384 DEVMETHOD(bus_release_resource, ahci_release_resource), 385 DEVMETHOD(bus_setup_intr, ahci_setup_intr), 386 DEVMETHOD(bus_teardown_intr,ahci_teardown_intr), 387 DEVMETHOD(bus_child_location_str, ahci_child_location_str), 388 DEVMETHOD_END 389}; 390 391static driver_t ahci_ata_driver = { 392 "ahci", 393 ahci_ata_methods, 394 sizeof(struct ahci_controller) 395}; 396 397DRIVER_MODULE(ahci, simplebus, ahci_ata_driver, ahci_devclass, 0, 0); 398