| /* |
| * TI OMAP on-chip I2C controller. Only "new I2C" mode supported. |
| * |
| * Copyright (C) 2007 Andrzej Zaborowski <balrog@zabor.org> |
| * |
| * This program is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU General Public License as |
| * published by the Free Software Foundation; either version 2 of |
| * the License, or (at your option) any later version. |
| * |
| * This program is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| * GNU General Public License for more details. |
| * |
| * You should have received a copy of the GNU General Public License along |
| * with this program; if not, see <http://www.gnu.org/licenses/>. |
| */ |
| #include "hw/hw.h" |
| #include "hw/i2c/i2c.h" |
| #include "hw/arm/omap.h" |
| #include "hw/sysbus.h" |
| |
| #define TYPE_OMAP_I2C "omap_i2c" |
| #define OMAP_I2C(obj) OBJECT_CHECK(OMAPI2CState, (obj), TYPE_OMAP_I2C) |
| |
| typedef struct OMAPI2CState { |
| SysBusDevice parent_obj; |
| |
| MemoryRegion iomem; |
| qemu_irq irq; |
| qemu_irq drq[2]; |
| I2CBus *bus; |
| |
| uint8_t revision; |
| void *iclk; |
| void *fclk; |
| |
| uint8_t mask; |
| uint16_t stat; |
| uint16_t dma; |
| uint16_t count; |
| int count_cur; |
| uint32_t fifo; |
| int rxlen; |
| int txlen; |
| uint16_t control; |
| uint16_t addr[2]; |
| uint8_t divider; |
| uint8_t times[2]; |
| uint16_t test; |
| } OMAPI2CState; |
| |
| #define OMAP2_INTR_REV 0x34 |
| #define OMAP2_GC_REV 0x34 |
| |
| static void omap_i2c_interrupts_update(OMAPI2CState *s) |
| { |
| qemu_set_irq(s->irq, s->stat & s->mask); |
| if ((s->dma >> 15) & 1) /* RDMA_EN */ |
| qemu_set_irq(s->drq[0], (s->stat >> 3) & 1); /* RRDY */ |
| if ((s->dma >> 7) & 1) /* XDMA_EN */ |
| qemu_set_irq(s->drq[1], (s->stat >> 4) & 1); /* XRDY */ |
| } |
| |
| static void omap_i2c_fifo_run(OMAPI2CState *s) |
| { |
| int ack = 1; |
| |
| if (!i2c_bus_busy(s->bus)) |
| return; |
| |
| if ((s->control >> 2) & 1) { /* RM */ |
| if ((s->control >> 1) & 1) { /* STP */ |
| i2c_end_transfer(s->bus); |
| s->control &= ~(1 << 1); /* STP */ |
| s->count_cur = s->count; |
| s->txlen = 0; |
| } else if ((s->control >> 9) & 1) { /* TRX */ |
| while (ack && s->txlen) |
| ack = (i2c_send(s->bus, |
| (s->fifo >> ((-- s->txlen) << 3)) & |
| 0xff) >= 0); |
| s->stat |= 1 << 4; /* XRDY */ |
| } else { |
| while (s->rxlen < 4) |
| s->fifo |= i2c_recv(s->bus) << ((s->rxlen ++) << 3); |
| s->stat |= 1 << 3; /* RRDY */ |
| } |
| } else { |
| if ((s->control >> 9) & 1) { /* TRX */ |
| while (ack && s->count_cur && s->txlen) { |
| ack = (i2c_send(s->bus, |
| (s->fifo >> ((-- s->txlen) << 3)) & |
| 0xff) >= 0); |
| s->count_cur --; |
| } |
| if (ack && s->count_cur) |
| s->stat |= 1 << 4; /* XRDY */ |
| else |
| s->stat &= ~(1 << 4); /* XRDY */ |
| if (!s->count_cur) { |
| s->stat |= 1 << 2; /* ARDY */ |
| s->control &= ~(1 << 10); /* MST */ |
| } |
| } else { |
| while (s->count_cur && s->rxlen < 4) { |
| s->fifo |= i2c_recv(s->bus) << ((s->rxlen ++) << 3); |
| s->count_cur --; |
| } |
| if (s->rxlen) |
| s->stat |= 1 << 3; /* RRDY */ |
| else |
| s->stat &= ~(1 << 3); /* RRDY */ |
| } |
| if (!s->count_cur) { |
| if ((s->control >> 1) & 1) { /* STP */ |
| i2c_end_transfer(s->bus); |
| s->control &= ~(1 << 1); /* STP */ |
| s->count_cur = s->count; |
| s->txlen = 0; |
| } else { |
| s->stat |= 1 << 2; /* ARDY */ |
| s->control &= ~(1 << 10); /* MST */ |
| } |
| } |
| } |
| |
| s->stat |= (!ack) << 1; /* NACK */ |
| if (!ack) |
| s->control &= ~(1 << 1); /* STP */ |
| } |
| |
| static void omap_i2c_reset(DeviceState *dev) |
| { |
| OMAPI2CState *s = OMAP_I2C(dev); |
| |
| s->mask = 0; |
| s->stat = 0; |
| s->dma = 0; |
| s->count = 0; |
| s->count_cur = 0; |
| s->fifo = 0; |
| s->rxlen = 0; |
| s->txlen = 0; |
| s->control = 0; |
| s->addr[0] = 0; |
| s->addr[1] = 0; |
| s->divider = 0; |
| s->times[0] = 0; |
| s->times[1] = 0; |
| s->test = 0; |
| } |
| |
| static uint32_t omap_i2c_read(void *opaque, hwaddr addr) |
| { |
| OMAPI2CState *s = opaque; |
| int offset = addr & OMAP_MPUI_REG_MASK; |
| uint16_t ret; |
| |
| switch (offset) { |
| case 0x00: /* I2C_REV */ |
| return s->revision; /* REV */ |
| |
| case 0x04: /* I2C_IE */ |
| return s->mask; |
| |
| case 0x08: /* I2C_STAT */ |
| return s->stat | (i2c_bus_busy(s->bus) << 12); |
| |
| case 0x0c: /* I2C_IV */ |
| if (s->revision >= OMAP2_INTR_REV) |
| break; |
| ret = ffs(s->stat & s->mask); |
| if (ret) |
| s->stat ^= 1 << (ret - 1); |
| omap_i2c_interrupts_update(s); |
| return ret; |
| |
| case 0x10: /* I2C_SYSS */ |
| return (s->control >> 15) & 1; /* I2C_EN */ |
| |
| case 0x14: /* I2C_BUF */ |
| return s->dma; |
| |
| case 0x18: /* I2C_CNT */ |
| return s->count_cur; /* DCOUNT */ |
| |
| case 0x1c: /* I2C_DATA */ |
| ret = 0; |
| if (s->control & (1 << 14)) { /* BE */ |
| ret |= ((s->fifo >> 0) & 0xff) << 8; |
| ret |= ((s->fifo >> 8) & 0xff) << 0; |
| } else { |
| ret |= ((s->fifo >> 8) & 0xff) << 8; |
| ret |= ((s->fifo >> 0) & 0xff) << 0; |
| } |
| if (s->rxlen == 1) { |
| s->stat |= 1 << 15; /* SBD */ |
| s->rxlen = 0; |
| } else if (s->rxlen > 1) { |
| if (s->rxlen > 2) |
| s->fifo >>= 16; |
| s->rxlen -= 2; |
| } else { |
| /* XXX: remote access (qualifier) error - what's that? */ |
| } |
| if (!s->rxlen) { |
| s->stat &= ~(1 << 3); /* RRDY */ |
| if (((s->control >> 10) & 1) && /* MST */ |
| ((~s->control >> 9) & 1)) { /* TRX */ |
| s->stat |= 1 << 2; /* ARDY */ |
| s->control &= ~(1 << 10); /* MST */ |
| } |
| } |
| s->stat &= ~(1 << 11); /* ROVR */ |
| omap_i2c_fifo_run(s); |
| omap_i2c_interrupts_update(s); |
| return ret; |
| |
| case 0x20: /* I2C_SYSC */ |
| return 0; |
| |
| case 0x24: /* I2C_CON */ |
| return s->control; |
| |
| case 0x28: /* I2C_OA */ |
| return s->addr[0]; |
| |
| case 0x2c: /* I2C_SA */ |
| return s->addr[1]; |
| |
| case 0x30: /* I2C_PSC */ |
| return s->divider; |
| |
| case 0x34: /* I2C_SCLL */ |
| return s->times[0]; |
| |
| case 0x38: /* I2C_SCLH */ |
| return s->times[1]; |
| |
| case 0x3c: /* I2C_SYSTEST */ |
| if (s->test & (1 << 15)) { /* ST_EN */ |
| s->test ^= 0xa; |
| return s->test; |
| } else |
| return s->test & ~0x300f; |
| } |
| |
| OMAP_BAD_REG(addr); |
| return 0; |
| } |
| |
| static void omap_i2c_write(void *opaque, hwaddr addr, |
| uint32_t value) |
| { |
| OMAPI2CState *s = opaque; |
| int offset = addr & OMAP_MPUI_REG_MASK; |
| int nack; |
| |
| switch (offset) { |
| case 0x00: /* I2C_REV */ |
| case 0x0c: /* I2C_IV */ |
| case 0x10: /* I2C_SYSS */ |
| OMAP_RO_REG(addr); |
| return; |
| |
| case 0x04: /* I2C_IE */ |
| s->mask = value & (s->revision < OMAP2_GC_REV ? 0x1f : 0x3f); |
| break; |
| |
| case 0x08: /* I2C_STAT */ |
| if (s->revision < OMAP2_INTR_REV) { |
| OMAP_RO_REG(addr); |
| return; |
| } |
| |
| /* RRDY and XRDY are reset by hardware. (in all versions???) */ |
| s->stat &= ~(value & 0x27); |
| omap_i2c_interrupts_update(s); |
| break; |
| |
| case 0x14: /* I2C_BUF */ |
| s->dma = value & 0x8080; |
| if (value & (1 << 15)) /* RDMA_EN */ |
| s->mask &= ~(1 << 3); /* RRDY_IE */ |
| if (value & (1 << 7)) /* XDMA_EN */ |
| s->mask &= ~(1 << 4); /* XRDY_IE */ |
| break; |
| |
| case 0x18: /* I2C_CNT */ |
| s->count = value; /* DCOUNT */ |
| break; |
| |
| case 0x1c: /* I2C_DATA */ |
| if (s->txlen > 2) { |
| /* XXX: remote access (qualifier) error - what's that? */ |
| break; |
| } |
| s->fifo <<= 16; |
| s->txlen += 2; |
| if (s->control & (1 << 14)) { /* BE */ |
| s->fifo |= ((value >> 8) & 0xff) << 8; |
| s->fifo |= ((value >> 0) & 0xff) << 0; |
| } else { |
| s->fifo |= ((value >> 0) & 0xff) << 8; |
| s->fifo |= ((value >> 8) & 0xff) << 0; |
| } |
| s->stat &= ~(1 << 10); /* XUDF */ |
| if (s->txlen > 2) |
| s->stat &= ~(1 << 4); /* XRDY */ |
| omap_i2c_fifo_run(s); |
| omap_i2c_interrupts_update(s); |
| break; |
| |
| case 0x20: /* I2C_SYSC */ |
| if (s->revision < OMAP2_INTR_REV) { |
| OMAP_BAD_REG(addr); |
| return; |
| } |
| |
| if (value & 2) { |
| omap_i2c_reset(DEVICE(s)); |
| } |
| break; |
| |
| case 0x24: /* I2C_CON */ |
| s->control = value & 0xcf87; |
| if (~value & (1 << 15)) { /* I2C_EN */ |
| if (s->revision < OMAP2_INTR_REV) { |
| omap_i2c_reset(DEVICE(s)); |
| } |
| break; |
| } |
| if ((value & (1 << 15)) && !(value & (1 << 10))) { /* MST */ |
| fprintf(stderr, "%s: I^2C slave mode not supported\n", |
| __FUNCTION__); |
| break; |
| } |
| if ((value & (1 << 15)) && value & (1 << 8)) { /* XA */ |
| fprintf(stderr, "%s: 10-bit addressing mode not supported\n", |
| __FUNCTION__); |
| break; |
| } |
| if ((value & (1 << 15)) && value & (1 << 0)) { /* STT */ |
| nack = !!i2c_start_transfer(s->bus, s->addr[1], /* SA */ |
| (~value >> 9) & 1); /* TRX */ |
| s->stat |= nack << 1; /* NACK */ |
| s->control &= ~(1 << 0); /* STT */ |
| s->fifo = 0; |
| if (nack) |
| s->control &= ~(1 << 1); /* STP */ |
| else { |
| s->count_cur = s->count; |
| omap_i2c_fifo_run(s); |
| } |
| omap_i2c_interrupts_update(s); |
| } |
| break; |
| |
| case 0x28: /* I2C_OA */ |
| s->addr[0] = value & 0x3ff; |
| break; |
| |
| case 0x2c: /* I2C_SA */ |
| s->addr[1] = value & 0x3ff; |
| break; |
| |
| case 0x30: /* I2C_PSC */ |
| s->divider = value; |
| break; |
| |
| case 0x34: /* I2C_SCLL */ |
| s->times[0] = value; |
| break; |
| |
| case 0x38: /* I2C_SCLH */ |
| s->times[1] = value; |
| break; |
| |
| case 0x3c: /* I2C_SYSTEST */ |
| s->test = value & 0xf80f; |
| if (value & (1 << 11)) /* SBB */ |
| if (s->revision >= OMAP2_INTR_REV) { |
| s->stat |= 0x3f; |
| omap_i2c_interrupts_update(s); |
| } |
| if (value & (1 << 15)) /* ST_EN */ |
| fprintf(stderr, "%s: System Test not supported\n", __FUNCTION__); |
| break; |
| |
| default: |
| OMAP_BAD_REG(addr); |
| return; |
| } |
| } |
| |
| static void omap_i2c_writeb(void *opaque, hwaddr addr, |
| uint32_t value) |
| { |
| OMAPI2CState *s = opaque; |
| int offset = addr & OMAP_MPUI_REG_MASK; |
| |
| switch (offset) { |
| case 0x1c: /* I2C_DATA */ |
| if (s->txlen > 2) { |
| /* XXX: remote access (qualifier) error - what's that? */ |
| break; |
| } |
| s->fifo <<= 8; |
| s->txlen += 1; |
| s->fifo |= value & 0xff; |
| s->stat &= ~(1 << 10); /* XUDF */ |
| if (s->txlen > 2) |
| s->stat &= ~(1 << 4); /* XRDY */ |
| omap_i2c_fifo_run(s); |
| omap_i2c_interrupts_update(s); |
| break; |
| |
| default: |
| OMAP_BAD_REG(addr); |
| return; |
| } |
| } |
| |
| static const MemoryRegionOps omap_i2c_ops = { |
| .old_mmio = { |
| .read = { |
| omap_badwidth_read16, |
| omap_i2c_read, |
| omap_badwidth_read16, |
| }, |
| .write = { |
| omap_i2c_writeb, /* Only the last fifo write can be 8 bit. */ |
| omap_i2c_write, |
| omap_badwidth_write16, |
| }, |
| }, |
| .endianness = DEVICE_NATIVE_ENDIAN, |
| }; |
| |
| static int omap_i2c_init(SysBusDevice *sbd) |
| { |
| DeviceState *dev = DEVICE(sbd); |
| OMAPI2CState *s = OMAP_I2C(dev); |
| |
| if (!s->fclk) { |
| hw_error("omap_i2c: fclk not connected\n"); |
| } |
| if (s->revision >= OMAP2_INTR_REV && !s->iclk) { |
| /* Note that OMAP1 doesn't have a separate interface clock */ |
| hw_error("omap_i2c: iclk not connected\n"); |
| } |
| sysbus_init_irq(sbd, &s->irq); |
| sysbus_init_irq(sbd, &s->drq[0]); |
| sysbus_init_irq(sbd, &s->drq[1]); |
| memory_region_init_io(&s->iomem, OBJECT(s), &omap_i2c_ops, s, "omap.i2c", |
| (s->revision < OMAP2_INTR_REV) ? 0x800 : 0x1000); |
| sysbus_init_mmio(sbd, &s->iomem); |
| s->bus = i2c_init_bus(dev, NULL); |
| return 0; |
| } |
| |
| static Property omap_i2c_properties[] = { |
| DEFINE_PROP_UINT8("revision", OMAPI2CState, revision, 0), |
| DEFINE_PROP_PTR("iclk", OMAPI2CState, iclk), |
| DEFINE_PROP_PTR("fclk", OMAPI2CState, fclk), |
| DEFINE_PROP_END_OF_LIST(), |
| }; |
| |
| static void omap_i2c_class_init(ObjectClass *klass, void *data) |
| { |
| DeviceClass *dc = DEVICE_CLASS(klass); |
| SysBusDeviceClass *k = SYS_BUS_DEVICE_CLASS(klass); |
| k->init = omap_i2c_init; |
| dc->props = omap_i2c_properties; |
| dc->reset = omap_i2c_reset; |
| /* Reason: pointer properties "iclk", "fclk" */ |
| dc->cannot_instantiate_with_device_add_yet = true; |
| } |
| |
| static const TypeInfo omap_i2c_info = { |
| .name = TYPE_OMAP_I2C, |
| .parent = TYPE_SYS_BUS_DEVICE, |
| .instance_size = sizeof(OMAPI2CState), |
| .class_init = omap_i2c_class_init, |
| }; |
| |
| static void omap_i2c_register_types(void) |
| { |
| type_register_static(&omap_i2c_info); |
| } |
| |
| I2CBus *omap_i2c_bus(DeviceState *omap_i2c) |
| { |
| OMAPI2CState *s = OMAP_I2C(omap_i2c); |
| return s->bus; |
| } |
| |
| type_init(omap_i2c_register_types) |
