| /* |
| * 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.h" |
| #include "i2c.h" |
| #include "omap.h" |
| |
| struct omap_i2c_s { |
| qemu_irq irq; |
| qemu_irq drq[2]; |
| i2c_bus *bus; |
| |
| uint8_t revision; |
| 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; |
| }; |
| |
| #define OMAP2_INTR_REV 0x34 |
| #define OMAP2_GC_REV 0x34 |
| |
| static void omap_i2c_interrupts_update(struct omap_i2c_s *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(struct omap_i2c_s *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 */ |
| } |
| |
| void omap_i2c_reset(struct omap_i2c_s *s) |
| { |
| 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, target_phys_addr_t addr) |
| { |
| struct omap_i2c_s *s = (struct omap_i2c_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, target_phys_addr_t addr, |
| uint32_t value) |
| { |
| struct omap_i2c_s *s = (struct omap_i2c_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(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(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, target_phys_addr_t addr, |
| uint32_t value) |
| { |
| struct omap_i2c_s *s = (struct omap_i2c_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 CPUReadMemoryFunc * const omap_i2c_readfn[] = { |
| omap_badwidth_read16, |
| omap_i2c_read, |
| omap_badwidth_read16, |
| }; |
| |
| static CPUWriteMemoryFunc * const omap_i2c_writefn[] = { |
| omap_i2c_writeb, /* Only the last fifo write can be 8 bit. */ |
| omap_i2c_write, |
| omap_badwidth_write16, |
| }; |
| |
| struct omap_i2c_s *omap_i2c_init(target_phys_addr_t base, |
| qemu_irq irq, qemu_irq *dma, omap_clk clk) |
| { |
| int iomemtype; |
| struct omap_i2c_s *s = (struct omap_i2c_s *) |
| qemu_mallocz(sizeof(struct omap_i2c_s)); |
| |
| /* TODO: set a value greater or equal to real hardware */ |
| s->revision = 0x11; |
| s->irq = irq; |
| s->drq[0] = dma[0]; |
| s->drq[1] = dma[1]; |
| s->bus = i2c_init_bus(NULL, "i2c"); |
| omap_i2c_reset(s); |
| |
| iomemtype = cpu_register_io_memory(omap_i2c_readfn, |
| omap_i2c_writefn, s); |
| cpu_register_physical_memory(base, 0x800, iomemtype); |
| |
| return s; |
| } |
| |
| struct omap_i2c_s *omap2_i2c_init(struct omap_target_agent_s *ta, |
| qemu_irq irq, qemu_irq *dma, omap_clk fclk, omap_clk iclk) |
| { |
| int iomemtype; |
| struct omap_i2c_s *s = (struct omap_i2c_s *) |
| qemu_mallocz(sizeof(struct omap_i2c_s)); |
| |
| s->revision = 0x34; |
| s->irq = irq; |
| s->drq[0] = dma[0]; |
| s->drq[1] = dma[1]; |
| s->bus = i2c_init_bus(NULL, "i2c"); |
| omap_i2c_reset(s); |
| |
| iomemtype = l4_register_io_memory(omap_i2c_readfn, |
| omap_i2c_writefn, s); |
| omap_l4_attach(ta, 0, iomemtype); |
| |
| return s; |
| } |
| |
| i2c_bus *omap_i2c_bus(struct omap_i2c_s *s) |
| { |
| return s->bus; |
| } |
