/*- * Copyright (c) 2015 Luiz Otavio O Souza All rights reserved. * Copyright (c) 2014-2015 M. Warner Losh * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * * The magic-bit-bang sequence used in this code may be based on a linux * platform driver in the Allwinner SDK from Allwinner Technology Co., Ltd. * www.allwinnertech.com, by Daniel Wang * though none of the original code was copied. */ #include "opt_bus.h" #include #include #include #include #include #include #include #include #include #include #include #include #include /* * Allwinner a1x/a2x/a8x SATA attachment. This is just the AHCI register * set with a few extra implementation-specific registers that need to * be accounted for. There's only one PHY in the system, and it needs * to be trained to bring the link up. In addition, there's some DMA * specific things that need to be done as well. These things are also * just about completely undocumented, except in ugly code in the Linux * SDK Allwinner releases. */ /* BITx -- Unknown bit that needs to be set/cleared at position x */ /* UFx -- Uknown multi-bit field frobbed during init */ #define AHCI_BISTAFR 0x00A0 #define AHCI_BISTCR 0x00A4 #define AHCI_BISTFCTR 0x00A8 #define AHCI_BISTSR 0x00AC #define AHCI_BISTDECR 0x00B0 #define AHCI_DIAGNR 0x00B4 #define AHCI_DIAGNR1 0x00B8 #define AHCI_OOBR 0x00BC #define AHCI_PHYCS0R 0x00C0 /* Bits 0..17 are a mystery */ #define PHYCS0R_BIT18 (1 << 18) #define PHYCS0R_POWER_ENABLE (1 << 19) #define PHYCS0R_UF1_MASK (7 << 20) /* Unknown Field 1 */ #define PHYCS0R_UF1_INIT (3 << 20) #define PHYCS0R_BIT23 (1 << 23) #define PHYCS0R_UF2_MASK (7 << 24) /* Uknown Field 2 */ #define PHYCS0R_UF2_INIT (5 << 24) /* Bit 27 mystery */ #define PHYCS0R_POWER_STATUS_MASK (7 << 28) #define PHYCS0R_PS_GOOD (2 << 28) /* Bit 31 mystery */ #define AHCI_PHYCS1R 0x00C4 /* Bits 0..5 are a mystery */ #define PHYCS1R_UF1_MASK (3 << 6) #define PHYCS1R_UF1_INIT (2 << 6) #define PHYCS1R_UF2_MASK (0x1f << 8) #define PHYCS1R_UF2_INIT (6 << 8) /* Bits 13..14 are a mystery */ #define PHYCS1R_BIT15 (1 << 15) #define PHYCS1R_UF3_MASK (3 << 16) #define PHYCS1R_UF3_INIT (2 << 16) /* Bit 18 mystery */ #define PHYCS1R_HIGHZ (1 << 19) /* Bits 20..27 mystery */ #define PHYCS1R_BIT28 (1 << 28) /* Bits 29..31 mystery */ #define AHCI_PHYCS2R 0x00C8 /* bits 0..4 mystery */ #define PHYCS2R_UF1_MASK (0x1f << 5) #define PHYCS2R_UF1_INIT (0x19 << 5) /* Bits 10..23 mystery */ #define PHYCS2R_CALIBRATE (1 << 24) /* Bits 25..31 mystery */ #define AHCI_TIMER1MS 0x00E0 #define AHCI_GPARAM1R 0x00E8 #define AHCI_GPARAM2R 0x00EC #define AHCI_PPARAMR 0x00F0 #define AHCI_TESTR 0x00F4 #define AHCI_VERSIONR 0x00F8 #define AHCI_IDR 0x00FC #define AHCI_RWCR 0x00FC #define AHCI_P0DMACR 0x0070 #define AHCI_P0PHYCR 0x0078 #define AHCI_P0PHYSR 0x007C #define PLL_FREQ 100000000 struct ahci_a10_softc { struct ahci_controller ahci_ctlr; regulator_t ahci_reg; clk_t clk_pll; clk_t clk_gate; }; static void inline ahci_set(struct resource *m, bus_size_t off, uint32_t set) { uint32_t val = ATA_INL(m, off); val |= set; ATA_OUTL(m, off, val); } static void inline ahci_clr(struct resource *m, bus_size_t off, uint32_t clr) { uint32_t val = ATA_INL(m, off); val &= ~clr; ATA_OUTL(m, off, val); } static void inline ahci_mask_set(struct resource *m, bus_size_t off, uint32_t mask, uint32_t set) { uint32_t val = ATA_INL(m, off); val &= mask; val |= set; ATA_OUTL(m, off, val); } /* * Should this be phy_reset or phy_init */ #define PHY_RESET_TIMEOUT 1000 static void ahci_a10_phy_reset(device_t dev) { uint32_t to, val; struct ahci_controller *ctlr = device_get_softc(dev); /* * Here starts the magic -- most of the comments are based * on guesswork, names of routines and printf error * messages. The code works, but it will do that even if the * comments are 100% BS. */ /* * Lock out other access while we initialize. Or at least that * seems to be the case based on Linux SDK #defines. Maybe this * put things into reset? */ ATA_OUTL(ctlr->r_mem, AHCI_RWCR, 0); DELAY(100); /* * Set bit 19 in PHYCS1R. Guessing this disables driving the PHY * port for a bit while we reset things. */ ahci_set(ctlr->r_mem, AHCI_PHYCS1R, PHYCS1R_HIGHZ); /* * Frob PHYCS0R... */ ahci_mask_set(ctlr->r_mem, AHCI_PHYCS0R, ~PHYCS0R_UF2_MASK, PHYCS0R_UF2_INIT | PHYCS0R_BIT23 | PHYCS0R_BIT18); /* * Set three fields in PHYCS1R */ ahci_mask_set(ctlr->r_mem, AHCI_PHYCS1R, ~(PHYCS1R_UF1_MASK | PHYCS1R_UF2_MASK | PHYCS1R_UF3_MASK), PHYCS1R_UF1_INIT | PHYCS1R_UF2_INIT | PHYCS1R_UF3_INIT); /* * Two more mystery bits in PHYCS1R. -- can these be combined above? */ ahci_set(ctlr->r_mem, AHCI_PHYCS1R, PHYCS1R_BIT15 | PHYCS1R_BIT28); /* * Now clear that first mysery bit. Perhaps this starts * driving the PHY again so we can power it up and start * talking to the SATA drive, if any below. */ ahci_clr(ctlr->r_mem, AHCI_PHYCS1R, PHYCS1R_HIGHZ); /* * Frob PHYCS0R again... */ ahci_mask_set(ctlr->r_mem, AHCI_PHYCS0R, ~PHYCS0R_UF1_MASK, PHYCS0R_UF1_INIT); /* * Frob PHYCS2R, because 25 means something? */ ahci_mask_set(ctlr->r_mem, AHCI_PHYCS2R, ~PHYCS2R_UF1_MASK, PHYCS2R_UF1_INIT); DELAY(100); /* WAG */ /* * Turn on the power to the PHY and wait for it to report back * good? */ ahci_set(ctlr->r_mem, AHCI_PHYCS0R, PHYCS0R_POWER_ENABLE); for (to = PHY_RESET_TIMEOUT; to > 0; to--) { val = ATA_INL(ctlr->r_mem, AHCI_PHYCS0R); if ((val & PHYCS0R_POWER_STATUS_MASK) == PHYCS0R_PS_GOOD) break; DELAY(10); } if (to == 0 && bootverbose) device_printf(dev, "PHY Power Failed PHYCS0R = %#x\n", val); /* * Calibrate the clocks between the device and the host. This appears * to be an automated process that clears the bit when it is done. */ ahci_set(ctlr->r_mem, AHCI_PHYCS2R, PHYCS2R_CALIBRATE); for (to = PHY_RESET_TIMEOUT; to > 0; to--) { val = ATA_INL(ctlr->r_mem, AHCI_PHYCS2R); if ((val & PHYCS2R_CALIBRATE) == 0) break; DELAY(10); } if (to == 0 && bootverbose) device_printf(dev, "PHY Cal Failed PHYCS2R %#x\n", val); /* * OK, let things settle down a bit. */ DELAY(1000); /* * Go back into normal mode now that we've calibrated the PHY. */ ATA_OUTL(ctlr->r_mem, AHCI_RWCR, 7); } static void ahci_a10_ch_start(struct ahci_channel *ch) { uint32_t reg; /* * Magical values from Allwinner SDK, setup the DMA before start * operations on this channel. */ reg = ATA_INL(ch->r_mem, AHCI_P0DMACR); reg &= ~0xff00; reg |= 0x4400; ATA_OUTL(ch->r_mem, AHCI_P0DMACR, reg); } static int ahci_a10_ctlr_reset(device_t dev) { ahci_a10_phy_reset(dev); return (ahci_ctlr_reset(dev)); } static int ahci_a10_probe(device_t dev) { if (!ofw_bus_is_compatible(dev, "allwinner,sun4i-a10-ahci")) return (ENXIO); device_set_desc(dev, "Allwinner Integrated AHCI controller"); return (BUS_PROBE_DEFAULT); } static int ahci_a10_attach(device_t dev) { int error; struct ahci_a10_softc *sc; struct ahci_controller *ctlr; sc = device_get_softc(dev); ctlr = &sc->ahci_ctlr; ctlr->quirks = AHCI_Q_NOPMP; ctlr->vendorid = 0; ctlr->deviceid = 0; ctlr->subvendorid = 0; ctlr->subdeviceid = 0; ctlr->r_rid = 0; if (!(ctlr->r_mem = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &ctlr->r_rid, RF_ACTIVE))) return (ENXIO); /* Enable the (optional) regulator */ if (regulator_get_by_ofw_property(dev, 0, "target-supply", &sc->ahci_reg) == 0) { error = regulator_enable(sc->ahci_reg); if (error != 0) { device_printf(dev, "Could not enable regulator\n"); goto fail; } } /* Enable clocks */ error = clk_get_by_ofw_index(dev, 0, 0, &sc->clk_gate); if (error != 0) { device_printf(dev, "Cannot get gate clock\n"); goto fail; } error = clk_get_by_ofw_index(dev, 0, 1, &sc->clk_pll); if (error != 0) { device_printf(dev, "Cannot get PLL clock\n"); goto fail; } error = clk_set_freq(sc->clk_pll, PLL_FREQ, CLK_SET_ROUND_DOWN); if (error != 0) { device_printf(dev, "Cannot set PLL frequency\n"); goto fail; } error = clk_enable(sc->clk_pll); if (error != 0) { device_printf(dev, "Cannot enable PLL\n"); goto fail; } error = clk_enable(sc->clk_gate); if (error != 0) { device_printf(dev, "Cannot enable clk gate\n"); goto fail; } /* Reset controller */ if ((error = ahci_a10_ctlr_reset(dev)) != 0) goto fail; /* * No MSI registers on this platform. */ ctlr->msi = 0; ctlr->numirqs = 1; /* Channel start callback(). */ ctlr->ch_start = ahci_a10_ch_start; /* * Note: ahci_attach will release ctlr->r_mem on errors automatically */ return (ahci_attach(dev)); fail: if (sc->ahci_reg != NULL) regulator_disable(sc->ahci_reg); if (sc->clk_gate != NULL) clk_release(sc->clk_gate); if (sc->clk_pll != NULL) clk_release(sc->clk_pll); bus_release_resource(dev, SYS_RES_MEMORY, ctlr->r_rid, ctlr->r_mem); return (error); } static int ahci_a10_detach(device_t dev) { struct ahci_a10_softc *sc; struct ahci_controller *ctlr; sc = device_get_softc(dev); ctlr = &sc->ahci_ctlr; if (sc->ahci_reg != NULL) regulator_disable(sc->ahci_reg); if (sc->clk_gate != NULL) clk_release(sc->clk_gate); if (sc->clk_pll != NULL) clk_release(sc->clk_pll); bus_release_resource(dev, SYS_RES_MEMORY, ctlr->r_rid, ctlr->r_mem); return (ahci_detach(dev)); } static device_method_t ahci_ata_methods[] = { DEVMETHOD(device_probe, ahci_a10_probe), DEVMETHOD(device_attach, ahci_a10_attach), DEVMETHOD(device_detach, ahci_a10_detach), DEVMETHOD(bus_print_child, ahci_print_child), DEVMETHOD(bus_alloc_resource, ahci_alloc_resource), DEVMETHOD(bus_release_resource, ahci_release_resource), DEVMETHOD(bus_setup_intr, ahci_setup_intr), DEVMETHOD(bus_teardown_intr,ahci_teardown_intr), DEVMETHOD(bus_child_location_str, ahci_child_location_str), DEVMETHOD_END }; static driver_t ahci_ata_driver = { "ahci", ahci_ata_methods, sizeof(struct ahci_a10_softc) }; DRIVER_MODULE(a10_ahci, simplebus, ahci_ata_driver, ahci_devclass, 0, 0);