/* $OpenBSD: glxpcib.c,v 1.5 2012/03/06 12:57:36 mikeb Exp $ */ /* * Copyright (c) 2007 Marc Balmer * Copyright (c) 2007 Michael Shalayeff * All rights reserved. * * Permission to use, copy, modify, and distribute this software for any * purpose with or without fee is hereby granted, provided that the above * copyright notice and this permission notice appear in all copies. * * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES * WHATSOEVER RESULTING FROM LOSS OF MIND, USE, DATA OR PROFITS, WHETHER IN * AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. */ /* * AMD CS5536 series LPC bridge also containing timer, watchdog, and GPIO. */ #include #include #include #include #include #include #include #include #ifdef __i386__ #include #endif #include #include #include #include #include #include #include #include "gpio.h" #define AMD5536_REV GLCP_CHIP_REV_ID #define AMD5536_REV_MASK 0xff #define AMD5536_TMC PMC_LTMR #define MSR_LBAR_ENABLE 0x100000000ULL /* Multi-Functional General Purpose Timer */ #define MSR_LBAR_MFGPT DIVIL_LBAR_MFGPT #define MSR_MFGPT_SIZE 0x40 #define MSR_MFGPT_ADDR_MASK 0xffc0 #define AMD5536_MFGPT0_CMP1 0x00000000 #define AMD5536_MFGPT0_CMP2 0x00000002 #define AMD5536_MFGPT0_CNT 0x00000004 #define AMD5536_MFGPT0_SETUP 0x00000006 #define AMD5536_MFGPT_DIV_MASK 0x000f /* div = 1 << mask */ #define AMD5536_MFGPT_CLKSEL 0x0010 #define AMD5536_MFGPT_REV_EN 0x0020 #define AMD5536_MFGPT_CMP1DIS 0x0000 #define AMD5536_MFGPT_CMP1EQ 0x0040 #define AMD5536_MFGPT_CMP1GE 0x0080 #define AMD5536_MFGPT_CMP1EV 0x00c0 #define AMD5536_MFGPT_CMP2DIS 0x0000 #define AMD5536_MFGPT_CMP2EQ 0x0100 #define AMD5536_MFGPT_CMP2GE 0x0200 #define AMD5536_MFGPT_CMP2EV 0x0300 #define AMD5536_MFGPT_STOP_EN 0x0800 #define AMD5536_MFGPT_SET 0x1000 #define AMD5536_MFGPT_CMP1 0x2000 #define AMD5536_MFGPT_CMP2 0x4000 #define AMD5536_MFGPT_CNT_EN 0x8000 #define AMD5536_MFGPT_IRQ MFGPT_IRQ #define AMD5536_MFGPT0_C1_IRQM 0x00000001 #define AMD5536_MFGPT1_C1_IRQM 0x00000002 #define AMD5536_MFGPT2_C1_IRQM 0x00000004 #define AMD5536_MFGPT3_C1_IRQM 0x00000008 #define AMD5536_MFGPT4_C1_IRQM 0x00000010 #define AMD5536_MFGPT5_C1_IRQM 0x00000020 #define AMD5536_MFGPT6_C1_IRQM 0x00000040 #define AMD5536_MFGPT7_C1_IRQM 0x00000080 #define AMD5536_MFGPT0_C2_IRQM 0x00000100 #define AMD5536_MFGPT1_C2_IRQM 0x00000200 #define AMD5536_MFGPT2_C2_IRQM 0x00000400 #define AMD5536_MFGPT3_C2_IRQM 0x00000800 #define AMD5536_MFGPT4_C2_IRQM 0x00001000 #define AMD5536_MFGPT5_C2_IRQM 0x00002000 #define AMD5536_MFGPT6_C2_IRQM 0x00004000 #define AMD5536_MFGPT7_C2_IRQM 0x00008000 #define AMD5536_MFGPT_NR MFGPT_NR #define AMD5536_MFGPT0_C1_NMIM 0x00000001 #define AMD5536_MFGPT1_C1_NMIM 0x00000002 #define AMD5536_MFGPT2_C1_NMIM 0x00000004 #define AMD5536_MFGPT3_C1_NMIM 0x00000008 #define AMD5536_MFGPT4_C1_NMIM 0x00000010 #define AMD5536_MFGPT5_C1_NMIM 0x00000020 #define AMD5536_MFGPT6_C1_NMIM 0x00000040 #define AMD5536_MFGPT7_C1_NMIM 0x00000080 #define AMD5536_MFGPT0_C2_NMIM 0x00000100 #define AMD5536_MFGPT1_C2_NMIM 0x00000200 #define AMD5536_MFGPT2_C2_NMIM 0x00000400 #define AMD5536_MFGPT3_C2_NMIM 0x00000800 #define AMD5536_MFGPT4_C2_NMIM 0x00001000 #define AMD5536_MFGPT5_C2_NMIM 0x00002000 #define AMD5536_MFGPT6_C2_NMIM 0x00004000 #define AMD5536_MFGPT7_C2_NMIM 0x00008000 #define AMD5536_NMI_LEG 0x00010000 #define AMD5536_MFGPT0_C2_RSTEN 0x01000000 #define AMD5536_MFGPT1_C2_RSTEN 0x02000000 #define AMD5536_MFGPT2_C2_RSTEN 0x04000000 #define AMD5536_MFGPT3_C2_RSTEN 0x08000000 #define AMD5536_MFGPT4_C2_RSTEN 0x10000000 #define AMD5536_MFGPT5_C2_RSTEN 0x20000000 #define AMD5536_MFGPT_SETUP MFGPT_SETUP /* GPIO */ #define MSR_LBAR_GPIO DIVIL_LBAR_GPIO #define MSR_GPIO_SIZE 0x100 #define MSR_GPIO_ADDR_MASK 0xff00 #define AMD5536_GPIO_NPINS 32 #define AMD5536_GPIOH_OFFSET 0x80 /* high bank register offset */ #define AMD5536_GPIO_OUT_VAL 0x00 /* output value */ #define AMD5536_GPIO_OUT_EN 0x04 /* output enable */ #define AMD5536_GPIO_OD_EN 0x08 /* open-drain enable */ #define AMD5536_GPIO_OUT_INVRT_EN 0x0c /* invert output */ #define AMD5536_GPIO_PU_EN 0x18 /* pull-up enable */ #define AMD5536_GPIO_PD_EN 0x1c /* pull-down enable */ #define AMD5536_GPIO_IN_EN 0x20 /* input enable */ #define AMD5536_GPIO_IN_INVRT_EN 0x24 /* invert input */ #define AMD5536_GPIO_READ_BACK 0x30 /* read back value */ /* SMB */ #define MSR_LBAR_SMB DIVIL_LBAR_SMB #define MSR_SMB_SIZE 0x08 #define MSR_SMB_ADDR_MASK 0xfff8 #define AMD5536_SMB_SDA 0x00 /* serial data */ #define AMD5536_SMB_STS 0x01 /* status */ #define AMD5536_SMB_STS_SLVSTOP 0x80 /* slave stop */ #define AMD5536_SMB_STS_SDAST 0x40 /* smb data status */ #define AMD5536_SMB_STS_BER 0x20 /* bus error */ #define AMD5536_SMB_STS_NEGACK 0x10 /* negative acknowledge */ #define AMD5536_SMB_STS_STASTR 0x08 /* stall after start */ #define AMD5536_SMB_STS_MASTER 0x02 /* master */ #define AMD5536_SMB_STS_XMIT 0x01 /* transmit or receive */ #define AMD5536_SMB_CST 0x02 /* control status */ #define AMD5536_SMB_CST_MATCH 0x04 /* address match */ #define AMD5536_SMB_CST_BB 0x02 /* bus busy */ #define AMD5536_SMB_CST_BUSY 0x01 /* busy */ #define AMD5536_SMB_CTL1 0x03 /* control 1 */ #define AMD5536_SMB_CTL1_STASTRE 0x80 /* stall after start enable */ #define AMD5536_SMB_CTL1_ACK 0x10 /* receive acknowledge */ #define AMD5536_SMB_CTL1_INTEN 0x04 /* interrupt enable */ #define AMD5536_SMB_CTL1_STOP 0x02 /* stop */ #define AMD5536_SMB_CTL1_START 0x01 /* start */ #define AMD5536_SMB_ADDR 0x04 /* serial address */ #define AMD5536_SMB_ADDR_SAEN 0x80 /* slave enable */ #define AMD5536_SMB_CTL2 0x05 /* control 2 */ #define AMD5536_SMB_CTL2_EN 0x01 /* enable clock */ #define AMD5536_SMB_CTL2_FREQ 0x78 /* 100 kHz */ #define AMD5536_SMB_CTL3 0x06 /* control 3 */ /* * MSR registers we want to preserve accross suspend/resume */ const uint32_t glxpcib_msrlist[] = { GLIU_PAE, GLCP_GLD_MSR_PM, DIVIL_BALL_OPTS }; struct glxpcib_softc { struct device sc_dev; struct timecounter sc_timecounter; bus_space_tag_t sc_iot; bus_space_handle_t sc_ioh; uint64_t sc_msrsave[nitems(glxpcib_msrlist)]; #ifndef SMALL_KERNEL #if NGPIO > 0 /* GPIO interface */ bus_space_tag_t sc_gpio_iot; bus_space_handle_t sc_gpio_ioh; struct gpio_chipset_tag sc_gpio_gc; gpio_pin_t sc_gpio_pins[AMD5536_GPIO_NPINS]; #endif /* I2C interface */ bus_space_tag_t sc_smb_iot; bus_space_handle_t sc_smb_ioh; struct i2c_controller sc_smb_ic; struct rwlock sc_smb_lck; /* Watchdog */ int sc_wdog; int sc_wdog_period; #endif }; struct cfdriver glxpcib_cd = { NULL, "glxpcib", DV_DULL }; int glxpcib_match(struct device *, void *, void *); void glxpcib_attach(struct device *, struct device *, void *); int glxpcib_activate(struct device *, int); struct cfattach glxpcib_ca = { sizeof(struct glxpcib_softc), glxpcib_match, glxpcib_attach, NULL, glxpcib_activate }; /* from arch/<*>/pci/pcib.c */ void pcibattach(struct device *parent, struct device *self, void *aux); u_int glxpcib_get_timecount(struct timecounter *tc); #ifndef SMALL_KERNEL int glxpcib_wdogctl_cb(void *, int); #if NGPIO > 0 void glxpcib_gpio_pin_ctl(void *, int, int); int glxpcib_gpio_pin_read(void *, int); void glxpcib_gpio_pin_write(void *, int, int); #endif int glxpcib_smb_acquire_bus(void *, int); void glxpcib_smb_release_bus(void *, int); int glxpcib_smb_send_start(void *, int); int glxpcib_smb_send_stop(void *, int); void glxpcib_smb_send_ack(void *, int); int glxpcib_smb_initiate_xfer(void *, i2c_addr_t, int); int glxpcib_smb_read_byte(void *, uint8_t *, int); int glxpcib_smb_write_byte(void *, uint8_t, int); void glxpcib_smb_reset(struct glxpcib_softc *); int glxpcib_smb_wait(struct glxpcib_softc *, int, int); #endif const struct pci_matchid glxpcib_devices[] = { { PCI_VENDOR_AMD, PCI_PRODUCT_AMD_CS5536_PCIB } }; int glxpcib_match(struct device *parent, void *match, void *aux) { if (pci_matchbyid((struct pci_attach_args *)aux, glxpcib_devices, nitems(glxpcib_devices))) { /* needs to win over pcib */ return 2; } return 0; } void glxpcib_attach(struct device *parent, struct device *self, void *aux) { struct glxpcib_softc *sc = (struct glxpcib_softc *)self; struct timecounter *tc = &sc->sc_timecounter; #ifndef SMALL_KERNEL struct pci_attach_args *pa = (struct pci_attach_args *)aux; u_int64_t wa; #if NGPIO > 0 u_int64_t ga; struct gpiobus_attach_args gba; int i, gpio = 0; #endif u_int64_t sa; struct i2cbus_attach_args iba; int i2c = 0; #endif tc->tc_get_timecount = glxpcib_get_timecount; tc->tc_counter_mask = 0xffffffff; tc->tc_frequency = 3579545; tc->tc_name = "CS5536"; #ifdef __loongson__ tc->tc_quality = 0; #else tc->tc_quality = 1000; #endif tc->tc_priv = sc; tc_init(tc); printf(": rev %d, 32-bit %lluHz timer", (int)rdmsr(AMD5536_REV) & AMD5536_REV_MASK, tc->tc_frequency); #ifndef SMALL_KERNEL /* Attach the watchdog timer */ sc->sc_iot = pa->pa_iot; wa = rdmsr(MSR_LBAR_MFGPT); if (wa & MSR_LBAR_ENABLE && !bus_space_map(sc->sc_iot, wa & MSR_MFGPT_ADDR_MASK, MSR_MFGPT_SIZE, 0, &sc->sc_ioh)) { /* count in seconds (as upper level desires) */ bus_space_write_2(sc->sc_iot, sc->sc_ioh, AMD5536_MFGPT0_SETUP, AMD5536_MFGPT_CNT_EN | AMD5536_MFGPT_CMP2EV | AMD5536_MFGPT_CMP2 | AMD5536_MFGPT_DIV_MASK); wdog_register(sc, glxpcib_wdogctl_cb); sc->sc_wdog = 1; printf(", watchdog"); } #if NGPIO > 0 /* map GPIO I/O space */ sc->sc_gpio_iot = pa->pa_iot; ga = rdmsr(MSR_LBAR_GPIO); if (ga & MSR_LBAR_ENABLE && !bus_space_map(sc->sc_gpio_iot, ga & MSR_GPIO_ADDR_MASK, MSR_GPIO_SIZE, 0, &sc->sc_gpio_ioh)) { printf(", gpio"); /* initialize pin array */ for (i = 0; i < AMD5536_GPIO_NPINS; i++) { sc->sc_gpio_pins[i].pin_num = i; sc->sc_gpio_pins[i].pin_caps = GPIO_PIN_INPUT | GPIO_PIN_OUTPUT | GPIO_PIN_OPENDRAIN | GPIO_PIN_PULLUP | GPIO_PIN_PULLDOWN | GPIO_PIN_INVIN | GPIO_PIN_INVOUT; /* read initial state */ sc->sc_gpio_pins[i].pin_state = glxpcib_gpio_pin_read(sc, i); } /* create controller tag */ sc->sc_gpio_gc.gp_cookie = sc; sc->sc_gpio_gc.gp_pin_read = glxpcib_gpio_pin_read; sc->sc_gpio_gc.gp_pin_write = glxpcib_gpio_pin_write; sc->sc_gpio_gc.gp_pin_ctl = glxpcib_gpio_pin_ctl; gba.gba_name = "gpio"; gba.gba_gc = &sc->sc_gpio_gc; gba.gba_pins = sc->sc_gpio_pins; gba.gba_npins = AMD5536_GPIO_NPINS; gpio = 1; } #endif /* NGPIO */ /* Map SMB I/O space */ sc->sc_smb_iot = pa->pa_iot; sa = rdmsr(MSR_LBAR_SMB); if (sa & MSR_LBAR_ENABLE && !bus_space_map(sc->sc_smb_iot, sa & MSR_SMB_ADDR_MASK, MSR_SMB_SIZE, 0, &sc->sc_smb_ioh)) { printf(", i2c"); /* Enable controller */ bus_space_write_1(sc->sc_smb_iot, sc->sc_smb_ioh, AMD5536_SMB_CTL2, AMD5536_SMB_CTL2_EN | AMD5536_SMB_CTL2_FREQ); /* Disable interrupts */ bus_space_write_1(sc->sc_smb_iot, sc->sc_smb_ioh, AMD5536_SMB_CTL1, 0); /* Disable slave address */ bus_space_write_1(sc->sc_smb_iot, sc->sc_smb_ioh, AMD5536_SMB_ADDR, 0); /* Stall the bus after start */ bus_space_write_1(sc->sc_smb_iot, sc->sc_smb_ioh, AMD5536_SMB_CTL1, AMD5536_SMB_CTL1_STASTRE); /* Attach I2C framework */ sc->sc_smb_ic.ic_cookie = sc; sc->sc_smb_ic.ic_acquire_bus = glxpcib_smb_acquire_bus; sc->sc_smb_ic.ic_release_bus = glxpcib_smb_release_bus; sc->sc_smb_ic.ic_send_start = glxpcib_smb_send_start; sc->sc_smb_ic.ic_send_stop = glxpcib_smb_send_stop; sc->sc_smb_ic.ic_initiate_xfer = glxpcib_smb_initiate_xfer; sc->sc_smb_ic.ic_read_byte = glxpcib_smb_read_byte; sc->sc_smb_ic.ic_write_byte = glxpcib_smb_write_byte; rw_init(&sc->sc_smb_lck, "iiclk"); bzero(&iba, sizeof(iba)); iba.iba_name = "iic"; iba.iba_tag = &sc->sc_smb_ic; i2c = 1; } #endif /* SMALL_KERNEL */ pcibattach(parent, self, aux); #ifndef SMALL_KERNEL #if NGPIO > 0 if (gpio) config_found(&sc->sc_dev, &gba, gpiobus_print); #endif if (i2c) config_found(&sc->sc_dev, &iba, iicbus_print); #endif } int glxpcib_activate(struct device *self, int act) { #ifndef SMALL_KERNEL struct glxpcib_softc *sc = (struct glxpcib_softc *)self; uint i; #endif int rv = 0; switch (act) { case DVACT_QUIESCE: rv = config_activate_children(self, act); break; case DVACT_SUSPEND: #ifndef SMALL_KERNEL if (sc->sc_wdog) { sc->sc_wdog_period = bus_space_read_2(sc->sc_iot, sc->sc_ioh, AMD5536_MFGPT0_CMP2); glxpcib_wdogctl_cb(sc, 0); } #endif rv = config_activate_children(self, act); #ifndef SMALL_KERNEL for (i = 0; i < nitems(glxpcib_msrlist); i++) sc->sc_msrsave[i] = rdmsr(glxpcib_msrlist[i]); #endif break; case DVACT_RESUME: #ifndef SMALL_KERNEL if (sc->sc_wdog) glxpcib_wdogctl_cb(sc, sc->sc_wdog_period); for (i = 0; i < nitems(glxpcib_msrlist); i++) wrmsr(glxpcib_msrlist[i], sc->sc_msrsave[i]); #endif rv = config_activate_children(self, act); break; } return (rv); } u_int glxpcib_get_timecount(struct timecounter *tc) { return rdmsr(AMD5536_TMC); } #ifndef SMALL_KERNEL int glxpcib_wdogctl_cb(void *v, int period) { struct glxpcib_softc *sc = v; if (period > 0xffff) period = 0xffff; bus_space_write_2(sc->sc_iot, sc->sc_ioh, AMD5536_MFGPT0_SETUP, AMD5536_MFGPT_CNT_EN | AMD5536_MFGPT_CMP2); bus_space_write_2(sc->sc_iot, sc->sc_ioh, AMD5536_MFGPT0_CNT, 0); bus_space_write_2(sc->sc_iot, sc->sc_ioh, AMD5536_MFGPT0_CMP2, period); if (period) wrmsr(AMD5536_MFGPT_NR, rdmsr(AMD5536_MFGPT_NR) | AMD5536_MFGPT0_C2_RSTEN); else wrmsr(AMD5536_MFGPT_NR, rdmsr(AMD5536_MFGPT_NR) & ~AMD5536_MFGPT0_C2_RSTEN); return period; } #if NGPIO > 0 int glxpcib_gpio_pin_read(void *arg, int pin) { struct glxpcib_softc *sc = arg; u_int32_t data; int reg, off = 0; reg = AMD5536_GPIO_IN_EN; if (pin > 15) { pin &= 0x0f; off = AMD5536_GPIOH_OFFSET; } reg += off; data = bus_space_read_4(sc->sc_gpio_iot, sc->sc_gpio_ioh, reg); if (data & (1 << pin)) reg = AMD5536_GPIO_READ_BACK + off; else reg = AMD5536_GPIO_OUT_VAL + off; data = bus_space_read_4(sc->sc_gpio_iot, sc->sc_gpio_ioh, reg); return data & 1 << pin ? GPIO_PIN_HIGH : GPIO_PIN_LOW; } void glxpcib_gpio_pin_write(void *arg, int pin, int value) { struct glxpcib_softc *sc = arg; u_int32_t data; int reg; reg = AMD5536_GPIO_OUT_VAL; if (pin > 15) { pin &= 0x0f; reg += AMD5536_GPIOH_OFFSET; } if (value == 1) data = 1 << pin; else data = 1 << (pin + 16); bus_space_write_4(sc->sc_gpio_iot, sc->sc_gpio_ioh, reg, data); } void glxpcib_gpio_pin_ctl(void *arg, int pin, int flags) { struct glxpcib_softc *sc = arg; int n, reg[7], val[7], nreg = 0, off = 0; if (pin > 15) { pin &= 0x0f; off = AMD5536_GPIOH_OFFSET; } reg[nreg] = AMD5536_GPIO_IN_EN + off; if (flags & GPIO_PIN_INPUT) val[nreg++] = 1 << pin; else val[nreg++] = 1 << (pin + 16); reg[nreg] = AMD5536_GPIO_OUT_EN + off; if (flags & GPIO_PIN_OUTPUT) val[nreg++] = 1 << pin; else val[nreg++] = 1 << (pin + 16); reg[nreg] = AMD5536_GPIO_OD_EN + off; if (flags & GPIO_PIN_OPENDRAIN) val[nreg++] = 1 << pin; else val[nreg++] = 1 << (pin + 16); reg[nreg] = AMD5536_GPIO_PU_EN + off; if (flags & GPIO_PIN_PULLUP) val[nreg++] = 1 << pin; else val[nreg++] = 1 << (pin + 16); reg[nreg] = AMD5536_GPIO_PD_EN + off; if (flags & GPIO_PIN_PULLDOWN) val[nreg++] = 1 << pin; else val[nreg++] = 1 << (pin + 16); reg[nreg] = AMD5536_GPIO_IN_INVRT_EN + off; if (flags & GPIO_PIN_INVIN) val[nreg++] = 1 << pin; else val[nreg++] = 1 << (pin + 16); reg[nreg] = AMD5536_GPIO_OUT_INVRT_EN + off; if (flags & GPIO_PIN_INVOUT) val[nreg++] = 1 << pin; else val[nreg++] = 1 << (pin + 16); /* set flags */ for (n = 0; n < nreg; n++) bus_space_write_4(sc->sc_gpio_iot, sc->sc_gpio_ioh, reg[n], val[n]); } #endif /* GPIO */ int glxpcib_smb_acquire_bus(void *arg, int flags) { struct glxpcib_softc *sc = arg; if (cold || flags & I2C_F_POLL) return (0); return (rw_enter(&sc->sc_smb_lck, RW_WRITE | RW_INTR)); } void glxpcib_smb_release_bus(void *arg, int flags) { struct glxpcib_softc *sc = arg; if (cold || flags & I2C_F_POLL) return; rw_exit(&sc->sc_smb_lck); } int glxpcib_smb_send_start(void *arg, int flags) { struct glxpcib_softc *sc = arg; u_int8_t ctl; ctl = bus_space_read_1(sc->sc_smb_iot, sc->sc_smb_ioh, AMD5536_SMB_CTL1); bus_space_write_1(sc->sc_smb_iot, sc->sc_smb_ioh, AMD5536_SMB_CTL1, ctl | AMD5536_SMB_CTL1_START); return (0); } int glxpcib_smb_send_stop(void *arg, int flags) { struct glxpcib_softc *sc = arg; u_int8_t ctl; ctl = bus_space_read_1(sc->sc_smb_iot, sc->sc_smb_ioh, AMD5536_SMB_CTL1); bus_space_write_1(sc->sc_smb_iot, sc->sc_smb_ioh, AMD5536_SMB_CTL1, ctl | AMD5536_SMB_CTL1_STOP); return (0); } void glxpcib_smb_send_ack(void *arg, int flags) { struct glxpcib_softc *sc = arg; u_int8_t ctl; ctl = bus_space_read_1(sc->sc_smb_iot, sc->sc_smb_ioh, AMD5536_SMB_CTL1); bus_space_write_1(sc->sc_smb_iot, sc->sc_smb_ioh, AMD5536_SMB_CTL1, ctl | AMD5536_SMB_CTL1_ACK); } int glxpcib_smb_initiate_xfer(void *arg, i2c_addr_t addr, int flags) { struct glxpcib_softc *sc = arg; int error, dir; /* Issue start condition */ glxpcib_smb_send_start(sc, flags); /* Wait for bus mastership */ if ((error = glxpcib_smb_wait(sc, AMD5536_SMB_STS_MASTER | AMD5536_SMB_STS_SDAST, flags)) != 0) return (error); /* Send address byte */ dir = (flags & I2C_F_READ ? 1 : 0); bus_space_write_1(sc->sc_smb_iot, sc->sc_smb_ioh, AMD5536_SMB_SDA, (addr << 1) | dir); return (0); } int glxpcib_smb_read_byte(void *arg, uint8_t *bytep, int flags) { struct glxpcib_softc *sc = arg; int error; /* Wait for the bus to be ready */ if ((error = glxpcib_smb_wait(sc, AMD5536_SMB_STS_SDAST, flags))) return (error); /* Acknowledge the last byte */ if (flags & I2C_F_LAST) glxpcib_smb_send_ack(sc, 0); /* Read data byte */ *bytep = bus_space_read_1(sc->sc_smb_iot, sc->sc_smb_ioh, AMD5536_SMB_SDA); return (0); } int glxpcib_smb_write_byte(void *arg, uint8_t byte, int flags) { struct glxpcib_softc *sc = arg; int error; /* Wait for the bus to be ready */ if ((error = glxpcib_smb_wait(sc, AMD5536_SMB_STS_SDAST, flags))) return (error); /* Send stop after the last byte */ if (flags & I2C_F_STOP) glxpcib_smb_send_stop(sc, 0); /* Write data byte */ bus_space_write_1(sc->sc_smb_iot, sc->sc_smb_ioh, AMD5536_SMB_SDA, byte); return (0); } void glxpcib_smb_reset(struct glxpcib_softc *sc) { u_int8_t st; /* Clear MASTER, NEGACK and BER */ st = bus_space_read_1(sc->sc_smb_iot, sc->sc_smb_ioh, AMD5536_SMB_STS); bus_space_write_1(sc->sc_smb_iot, sc->sc_smb_ioh, AMD5536_SMB_STS, st | AMD5536_SMB_STS_MASTER | AMD5536_SMB_STS_NEGACK | AMD5536_SMB_STS_BER); /* Disable and re-enable controller */ bus_space_write_1(sc->sc_smb_iot, sc->sc_smb_ioh, AMD5536_SMB_CTL2, 0); bus_space_write_1(sc->sc_smb_iot, sc->sc_smb_ioh, AMD5536_SMB_CTL2, AMD5536_SMB_CTL2_EN | AMD5536_SMB_CTL2_FREQ); /* Send stop */ glxpcib_smb_send_stop(sc, 0); } int glxpcib_smb_wait(struct glxpcib_softc *sc, int bits, int flags) { u_int8_t st; int i; for (i = 0; i < 100; i++) { st = bus_space_read_1(sc->sc_smb_iot, sc->sc_smb_ioh, AMD5536_SMB_STS); if (st & AMD5536_SMB_STS_BER) { printf("%s: bus error, bits=%#x st=%#x\n", sc->sc_dev.dv_xname, bits, st); glxpcib_smb_reset(sc); return (EIO); } if ((bits & AMD5536_SMB_STS_MASTER) == 0 && (st & AMD5536_SMB_STS_NEGACK)) { glxpcib_smb_reset(sc); return (EIO); } if (st & AMD5536_SMB_STS_STASTR) bus_space_write_1(sc->sc_smb_iot, sc->sc_smb_ioh, AMD5536_SMB_STS, AMD5536_SMB_STS_STASTR); if ((st & bits) == bits) break; delay(2); } if ((st & bits) != bits) { glxpcib_smb_reset(sc); return (ETIMEDOUT); } return (0); } #endif /* SMALL_KERNEL */