| /* |
| * TI OMAP processor's Multichannel SPI emulation. |
| * |
| * Copyright (C) 2007-2009 Nokia Corporation |
| * |
| * Original code for OMAP2 by Andrzej Zaborowski <andrew@openedhand.com> |
| * |
| * 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 or |
| * (at your option) any later version of the License. |
| * |
| * 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, write to the Free Software Foundation, Inc., |
| * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. |
| */ |
| #include "qemu/osdep.h" |
| #include "hw/hw.h" |
| #include "hw/arm/omap.h" |
| |
| /* Multichannel SPI */ |
| struct omap_mcspi_s { |
| MemoryRegion iomem; |
| qemu_irq irq; |
| int chnum; |
| |
| uint32_t sysconfig; |
| uint32_t systest; |
| uint32_t irqst; |
| uint32_t irqen; |
| uint32_t wken; |
| uint32_t control; |
| |
| struct omap_mcspi_ch_s { |
| qemu_irq txdrq; |
| qemu_irq rxdrq; |
| uint32_t (*txrx)(void *opaque, uint32_t, int); |
| void *opaque; |
| |
| uint32_t tx; |
| uint32_t rx; |
| |
| uint32_t config; |
| uint32_t status; |
| uint32_t control; |
| } ch[4]; |
| }; |
| |
| static inline void omap_mcspi_interrupt_update(struct omap_mcspi_s *s) |
| { |
| qemu_set_irq(s->irq, s->irqst & s->irqen); |
| } |
| |
| static inline void omap_mcspi_dmarequest_update(struct omap_mcspi_ch_s *ch) |
| { |
| qemu_set_irq(ch->txdrq, |
| (ch->control & 1) && /* EN */ |
| (ch->config & (1 << 14)) && /* DMAW */ |
| (ch->status & (1 << 1)) && /* TXS */ |
| ((ch->config >> 12) & 3) != 1); /* TRM */ |
| qemu_set_irq(ch->rxdrq, |
| (ch->control & 1) && /* EN */ |
| (ch->config & (1 << 15)) && /* DMAW */ |
| (ch->status & (1 << 0)) && /* RXS */ |
| ((ch->config >> 12) & 3) != 2); /* TRM */ |
| } |
| |
| static void omap_mcspi_transfer_run(struct omap_mcspi_s *s, int chnum) |
| { |
| struct omap_mcspi_ch_s *ch = s->ch + chnum; |
| |
| if (!(ch->control & 1)) /* EN */ |
| return; |
| if ((ch->status & (1 << 0)) && /* RXS */ |
| ((ch->config >> 12) & 3) != 2 && /* TRM */ |
| !(ch->config & (1 << 19))) /* TURBO */ |
| goto intr_update; |
| if ((ch->status & (1 << 1)) && /* TXS */ |
| ((ch->config >> 12) & 3) != 1) /* TRM */ |
| goto intr_update; |
| |
| if (!(s->control & 1) || /* SINGLE */ |
| (ch->config & (1 << 20))) { /* FORCE */ |
| if (ch->txrx) |
| ch->rx = ch->txrx(ch->opaque, ch->tx, /* WL */ |
| 1 + (0x1f & (ch->config >> 7))); |
| } |
| |
| ch->tx = 0; |
| ch->status |= 1 << 2; /* EOT */ |
| ch->status |= 1 << 1; /* TXS */ |
| if (((ch->config >> 12) & 3) != 2) /* TRM */ |
| ch->status |= 1 << 0; /* RXS */ |
| |
| intr_update: |
| if ((ch->status & (1 << 0)) && /* RXS */ |
| ((ch->config >> 12) & 3) != 2 && /* TRM */ |
| !(ch->config & (1 << 19))) /* TURBO */ |
| s->irqst |= 1 << (2 + 4 * chnum); /* RX_FULL */ |
| if ((ch->status & (1 << 1)) && /* TXS */ |
| ((ch->config >> 12) & 3) != 1) /* TRM */ |
| s->irqst |= 1 << (0 + 4 * chnum); /* TX_EMPTY */ |
| omap_mcspi_interrupt_update(s); |
| omap_mcspi_dmarequest_update(ch); |
| } |
| |
| void omap_mcspi_reset(struct omap_mcspi_s *s) |
| { |
| int ch; |
| |
| s->sysconfig = 0; |
| s->systest = 0; |
| s->irqst = 0; |
| s->irqen = 0; |
| s->wken = 0; |
| s->control = 4; |
| |
| for (ch = 0; ch < 4; ch ++) { |
| s->ch[ch].config = 0x060000; |
| s->ch[ch].status = 2; /* TXS */ |
| s->ch[ch].control = 0; |
| |
| omap_mcspi_dmarequest_update(s->ch + ch); |
| } |
| |
| omap_mcspi_interrupt_update(s); |
| } |
| |
| static uint64_t omap_mcspi_read(void *opaque, hwaddr addr, |
| unsigned size) |
| { |
| struct omap_mcspi_s *s = (struct omap_mcspi_s *) opaque; |
| int ch = 0; |
| uint32_t ret; |
| |
| if (size != 4) { |
| return omap_badwidth_read32(opaque, addr); |
| } |
| |
| switch (addr) { |
| case 0x00: /* MCSPI_REVISION */ |
| return 0x91; |
| |
| case 0x10: /* MCSPI_SYSCONFIG */ |
| return s->sysconfig; |
| |
| case 0x14: /* MCSPI_SYSSTATUS */ |
| return 1; /* RESETDONE */ |
| |
| case 0x18: /* MCSPI_IRQSTATUS */ |
| return s->irqst; |
| |
| case 0x1c: /* MCSPI_IRQENABLE */ |
| return s->irqen; |
| |
| case 0x20: /* MCSPI_WAKEUPENABLE */ |
| return s->wken; |
| |
| case 0x24: /* MCSPI_SYST */ |
| return s->systest; |
| |
| case 0x28: /* MCSPI_MODULCTRL */ |
| return s->control; |
| |
| case 0x68: ch ++; |
| /* fall through */ |
| case 0x54: ch ++; |
| /* fall through */ |
| case 0x40: ch ++; |
| /* fall through */ |
| case 0x2c: /* MCSPI_CHCONF */ |
| return s->ch[ch].config; |
| |
| case 0x6c: ch ++; |
| /* fall through */ |
| case 0x58: ch ++; |
| /* fall through */ |
| case 0x44: ch ++; |
| /* fall through */ |
| case 0x30: /* MCSPI_CHSTAT */ |
| return s->ch[ch].status; |
| |
| case 0x70: ch ++; |
| /* fall through */ |
| case 0x5c: ch ++; |
| /* fall through */ |
| case 0x48: ch ++; |
| /* fall through */ |
| case 0x34: /* MCSPI_CHCTRL */ |
| return s->ch[ch].control; |
| |
| case 0x74: ch ++; |
| /* fall through */ |
| case 0x60: ch ++; |
| /* fall through */ |
| case 0x4c: ch ++; |
| /* fall through */ |
| case 0x38: /* MCSPI_TX */ |
| return s->ch[ch].tx; |
| |
| case 0x78: ch ++; |
| /* fall through */ |
| case 0x64: ch ++; |
| /* fall through */ |
| case 0x50: ch ++; |
| /* fall through */ |
| case 0x3c: /* MCSPI_RX */ |
| s->ch[ch].status &= ~(1 << 0); /* RXS */ |
| ret = s->ch[ch].rx; |
| omap_mcspi_transfer_run(s, ch); |
| return ret; |
| } |
| |
| OMAP_BAD_REG(addr); |
| return 0; |
| } |
| |
| static void omap_mcspi_write(void *opaque, hwaddr addr, |
| uint64_t value, unsigned size) |
| { |
| struct omap_mcspi_s *s = (struct omap_mcspi_s *) opaque; |
| int ch = 0; |
| |
| if (size != 4) { |
| omap_badwidth_write32(opaque, addr, value); |
| return; |
| } |
| |
| switch (addr) { |
| case 0x00: /* MCSPI_REVISION */ |
| case 0x14: /* MCSPI_SYSSTATUS */ |
| case 0x30: /* MCSPI_CHSTAT0 */ |
| case 0x3c: /* MCSPI_RX0 */ |
| case 0x44: /* MCSPI_CHSTAT1 */ |
| case 0x50: /* MCSPI_RX1 */ |
| case 0x58: /* MCSPI_CHSTAT2 */ |
| case 0x64: /* MCSPI_RX2 */ |
| case 0x6c: /* MCSPI_CHSTAT3 */ |
| case 0x78: /* MCSPI_RX3 */ |
| OMAP_RO_REG(addr); |
| return; |
| |
| case 0x10: /* MCSPI_SYSCONFIG */ |
| if (value & (1 << 1)) /* SOFTRESET */ |
| omap_mcspi_reset(s); |
| s->sysconfig = value & 0x31d; |
| break; |
| |
| case 0x18: /* MCSPI_IRQSTATUS */ |
| if (!((s->control & (1 << 3)) && (s->systest & (1 << 11)))) { |
| s->irqst &= ~value; |
| omap_mcspi_interrupt_update(s); |
| } |
| break; |
| |
| case 0x1c: /* MCSPI_IRQENABLE */ |
| s->irqen = value & 0x1777f; |
| omap_mcspi_interrupt_update(s); |
| break; |
| |
| case 0x20: /* MCSPI_WAKEUPENABLE */ |
| s->wken = value & 1; |
| break; |
| |
| case 0x24: /* MCSPI_SYST */ |
| if (s->control & (1 << 3)) /* SYSTEM_TEST */ |
| if (value & (1 << 11)) { /* SSB */ |
| s->irqst |= 0x1777f; |
| omap_mcspi_interrupt_update(s); |
| } |
| s->systest = value & 0xfff; |
| break; |
| |
| case 0x28: /* MCSPI_MODULCTRL */ |
| if (value & (1 << 3)) /* SYSTEM_TEST */ |
| if (s->systest & (1 << 11)) { /* SSB */ |
| s->irqst |= 0x1777f; |
| omap_mcspi_interrupt_update(s); |
| } |
| s->control = value & 0xf; |
| break; |
| |
| case 0x68: ch ++; |
| /* fall through */ |
| case 0x54: ch ++; |
| /* fall through */ |
| case 0x40: ch ++; |
| /* fall through */ |
| case 0x2c: /* MCSPI_CHCONF */ |
| if ((value ^ s->ch[ch].config) & (3 << 14)) /* DMAR | DMAW */ |
| omap_mcspi_dmarequest_update(s->ch + ch); |
| if (((value >> 12) & 3) == 3) /* TRM */ |
| fprintf(stderr, "%s: invalid TRM value (3)\n", __FUNCTION__); |
| if (((value >> 7) & 0x1f) < 3) /* WL */ |
| fprintf(stderr, "%s: invalid WL value (%" PRIx64 ")\n", |
| __FUNCTION__, (value >> 7) & 0x1f); |
| s->ch[ch].config = value & 0x7fffff; |
| break; |
| |
| case 0x70: ch ++; |
| /* fall through */ |
| case 0x5c: ch ++; |
| /* fall through */ |
| case 0x48: ch ++; |
| /* fall through */ |
| case 0x34: /* MCSPI_CHCTRL */ |
| if (value & ~s->ch[ch].control & 1) { /* EN */ |
| s->ch[ch].control |= 1; |
| omap_mcspi_transfer_run(s, ch); |
| } else |
| s->ch[ch].control = value & 1; |
| break; |
| |
| case 0x74: ch ++; |
| /* fall through */ |
| case 0x60: ch ++; |
| /* fall through */ |
| case 0x4c: ch ++; |
| /* fall through */ |
| case 0x38: /* MCSPI_TX */ |
| s->ch[ch].tx = value; |
| s->ch[ch].status &= ~(1 << 1); /* TXS */ |
| omap_mcspi_transfer_run(s, ch); |
| break; |
| |
| default: |
| OMAP_BAD_REG(addr); |
| return; |
| } |
| } |
| |
| static const MemoryRegionOps omap_mcspi_ops = { |
| .read = omap_mcspi_read, |
| .write = omap_mcspi_write, |
| .endianness = DEVICE_NATIVE_ENDIAN, |
| }; |
| |
| struct omap_mcspi_s *omap_mcspi_init(struct omap_target_agent_s *ta, int chnum, |
| qemu_irq irq, qemu_irq *drq, omap_clk fclk, omap_clk iclk) |
| { |
| struct omap_mcspi_s *s = g_new0(struct omap_mcspi_s, 1); |
| struct omap_mcspi_ch_s *ch = s->ch; |
| |
| s->irq = irq; |
| s->chnum = chnum; |
| while (chnum --) { |
| ch->txdrq = *drq ++; |
| ch->rxdrq = *drq ++; |
| ch ++; |
| } |
| omap_mcspi_reset(s); |
| |
| memory_region_init_io(&s->iomem, NULL, &omap_mcspi_ops, s, "omap.mcspi", |
| omap_l4_region_size(ta, 0)); |
| omap_l4_attach(ta, 0, &s->iomem); |
| |
| return s; |
| } |
| |
| void omap_mcspi_attach(struct omap_mcspi_s *s, |
| uint32_t (*txrx)(void *opaque, uint32_t, int), void *opaque, |
| int chipselect) |
| { |
| if (chipselect < 0 || chipselect >= s->chnum) |
| hw_error("%s: Bad chipselect %i\n", __FUNCTION__, chipselect); |
| |
| s->ch[chipselect].txrx = txrx; |
| s->ch[chipselect].opaque = opaque; |
| } |
