root / hw / omap_spi.c @ 0d09e41a
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/*
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* TI OMAP processor's Multichannel SPI emulation.
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*
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* Copyright (C) 2007-2009 Nokia Corporation
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*
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* Original code for OMAP2 by Andrzej Zaborowski <andrew@openedhand.com>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 or
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* (at your option) any later version of the License.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#include "hw/hw.h" |
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#include "hw/arm/omap.h" |
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/* Multichannel SPI */
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struct omap_mcspi_s {
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MemoryRegion iomem; |
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qemu_irq irq; |
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int chnum;
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uint32_t sysconfig; |
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uint32_t systest; |
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uint32_t irqst; |
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uint32_t irqen; |
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uint32_t wken; |
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uint32_t control; |
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struct omap_mcspi_ch_s {
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qemu_irq txdrq; |
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qemu_irq rxdrq; |
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uint32_t (*txrx)(void *opaque, uint32_t, int); |
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void *opaque;
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uint32_t tx; |
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uint32_t rx; |
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uint32_t config; |
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uint32_t status; |
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uint32_t control; |
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} ch[4];
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}; |
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static inline void omap_mcspi_interrupt_update(struct omap_mcspi_s *s) |
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{
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qemu_set_irq(s->irq, s->irqst & s->irqen); |
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} |
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static inline void omap_mcspi_dmarequest_update(struct omap_mcspi_ch_s *ch) |
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{
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qemu_set_irq(ch->txdrq, |
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(ch->control & 1) && /* EN */ |
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(ch->config & (1 << 14)) && /* DMAW */ |
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(ch->status & (1 << 1)) && /* TXS */ |
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((ch->config >> 12) & 3) != 1); /* TRM */ |
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qemu_set_irq(ch->rxdrq, |
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(ch->control & 1) && /* EN */ |
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(ch->config & (1 << 15)) && /* DMAW */ |
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(ch->status & (1 << 0)) && /* RXS */ |
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((ch->config >> 12) & 3) != 2); /* TRM */ |
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} |
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static void omap_mcspi_transfer_run(struct omap_mcspi_s *s, int chnum) |
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{
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struct omap_mcspi_ch_s *ch = s->ch + chnum;
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if (!(ch->control & 1)) /* EN */ |
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return;
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if ((ch->status & (1 << 0)) && /* RXS */ |
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((ch->config >> 12) & 3) != 2 && /* TRM */ |
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!(ch->config & (1 << 19))) /* TURBO */ |
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goto intr_update;
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if ((ch->status & (1 << 1)) && /* TXS */ |
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((ch->config >> 12) & 3) != 1) /* TRM */ |
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goto intr_update;
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if (!(s->control & 1) || /* SINGLE */ |
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(ch->config & (1 << 20))) { /* FORCE */ |
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if (ch->txrx)
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ch->rx = ch->txrx(ch->opaque, ch->tx, /* WL */
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1 + (0x1f & (ch->config >> 7))); |
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} |
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ch->tx = 0;
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ch->status |= 1 << 2; /* EOT */ |
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ch->status |= 1 << 1; /* TXS */ |
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if (((ch->config >> 12) & 3) != 2) /* TRM */ |
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ch->status |= 1 << 0; /* RXS */ |
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intr_update:
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if ((ch->status & (1 << 0)) && /* RXS */ |
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((ch->config >> 12) & 3) != 2 && /* TRM */ |
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!(ch->config & (1 << 19))) /* TURBO */ |
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s->irqst |= 1 << (2 + 4 * chnum); /* RX_FULL */ |
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if ((ch->status & (1 << 1)) && /* TXS */ |
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((ch->config >> 12) & 3) != 1) /* TRM */ |
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s->irqst |= 1 << (0 + 4 * chnum); /* TX_EMPTY */ |
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omap_mcspi_interrupt_update(s); |
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omap_mcspi_dmarequest_update(ch); |
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} |
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void omap_mcspi_reset(struct omap_mcspi_s *s) |
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{
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int ch;
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s->sysconfig = 0;
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s->systest = 0;
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s->irqst = 0;
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s->irqen = 0;
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s->wken = 0;
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s->control = 4;
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for (ch = 0; ch < 4; ch ++) { |
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s->ch[ch].config = 0x060000;
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s->ch[ch].status = 2; /* TXS */ |
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s->ch[ch].control = 0;
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omap_mcspi_dmarequest_update(s->ch + ch); |
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} |
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omap_mcspi_interrupt_update(s); |
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} |
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static uint64_t omap_mcspi_read(void *opaque, hwaddr addr, |
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unsigned size)
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{
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struct omap_mcspi_s *s = (struct omap_mcspi_s *) opaque; |
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int ch = 0; |
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uint32_t ret; |
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if (size != 4) { |
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return omap_badwidth_read32(opaque, addr);
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} |
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switch (addr) {
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case 0x00: /* MCSPI_REVISION */ |
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return 0x91; |
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case 0x10: /* MCSPI_SYSCONFIG */ |
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return s->sysconfig;
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case 0x14: /* MCSPI_SYSSTATUS */ |
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return 1; /* RESETDONE */ |
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case 0x18: /* MCSPI_IRQSTATUS */ |
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return s->irqst;
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case 0x1c: /* MCSPI_IRQENABLE */ |
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return s->irqen;
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case 0x20: /* MCSPI_WAKEUPENABLE */ |
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return s->wken;
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case 0x24: /* MCSPI_SYST */ |
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return s->systest;
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case 0x28: /* MCSPI_MODULCTRL */ |
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return s->control;
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case 0x68: ch ++; |
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/* fall through */
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case 0x54: ch ++; |
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/* fall through */
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case 0x40: ch ++; |
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/* fall through */
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case 0x2c: /* MCSPI_CHCONF */ |
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return s->ch[ch].config;
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case 0x6c: ch ++; |
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/* fall through */
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case 0x58: ch ++; |
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/* fall through */
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case 0x44: ch ++; |
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/* fall through */
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case 0x30: /* MCSPI_CHSTAT */ |
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return s->ch[ch].status;
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case 0x70: ch ++; |
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/* fall through */
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case 0x5c: ch ++; |
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/* fall through */
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case 0x48: ch ++; |
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/* fall through */
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case 0x34: /* MCSPI_CHCTRL */ |
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return s->ch[ch].control;
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case 0x74: ch ++; |
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/* fall through */
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case 0x60: ch ++; |
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/* fall through */
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case 0x4c: ch ++; |
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/* fall through */
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case 0x38: /* MCSPI_TX */ |
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return s->ch[ch].tx;
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case 0x78: ch ++; |
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/* fall through */
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case 0x64: ch ++; |
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/* fall through */
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case 0x50: ch ++; |
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/* fall through */
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case 0x3c: /* MCSPI_RX */ |
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s->ch[ch].status &= ~(1 << 0); /* RXS */ |
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ret = s->ch[ch].rx; |
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omap_mcspi_transfer_run(s, ch); |
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return ret;
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} |
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OMAP_BAD_REG(addr); |
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return 0; |
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} |
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static void omap_mcspi_write(void *opaque, hwaddr addr, |
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uint64_t value, unsigned size)
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{
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struct omap_mcspi_s *s = (struct omap_mcspi_s *) opaque; |
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int ch = 0; |
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if (size != 4) { |
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return omap_badwidth_write32(opaque, addr, value);
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} |
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switch (addr) {
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case 0x00: /* MCSPI_REVISION */ |
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case 0x14: /* MCSPI_SYSSTATUS */ |
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case 0x30: /* MCSPI_CHSTAT0 */ |
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case 0x3c: /* MCSPI_RX0 */ |
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case 0x44: /* MCSPI_CHSTAT1 */ |
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case 0x50: /* MCSPI_RX1 */ |
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case 0x58: /* MCSPI_CHSTAT2 */ |
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case 0x64: /* MCSPI_RX2 */ |
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case 0x6c: /* MCSPI_CHSTAT3 */ |
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case 0x78: /* MCSPI_RX3 */ |
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OMAP_RO_REG(addr); |
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return;
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case 0x10: /* MCSPI_SYSCONFIG */ |
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if (value & (1 << 1)) /* SOFTRESET */ |
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omap_mcspi_reset(s); |
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s->sysconfig = value & 0x31d;
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break;
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case 0x18: /* MCSPI_IRQSTATUS */ |
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if (!((s->control & (1 << 3)) && (s->systest & (1 << 11)))) { |
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s->irqst &= ~value; |
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omap_mcspi_interrupt_update(s); |
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} |
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break;
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case 0x1c: /* MCSPI_IRQENABLE */ |
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s->irqen = value & 0x1777f;
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omap_mcspi_interrupt_update(s); |
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break;
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case 0x20: /* MCSPI_WAKEUPENABLE */ |
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s->wken = value & 1;
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break;
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case 0x24: /* MCSPI_SYST */ |
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if (s->control & (1 << 3)) /* SYSTEM_TEST */ |
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if (value & (1 << 11)) { /* SSB */ |
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s->irqst |= 0x1777f;
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omap_mcspi_interrupt_update(s); |
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} |
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s->systest = value & 0xfff;
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break;
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case 0x28: /* MCSPI_MODULCTRL */ |
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if (value & (1 << 3)) /* SYSTEM_TEST */ |
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if (s->systest & (1 << 11)) { /* SSB */ |
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s->irqst |= 0x1777f;
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omap_mcspi_interrupt_update(s); |
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} |
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s->control = value & 0xf;
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break;
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case 0x68: ch ++; |
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/* fall through */
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case 0x54: ch ++; |
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/* fall through */
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case 0x40: ch ++; |
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/* fall through */
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case 0x2c: /* MCSPI_CHCONF */ |
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if ((value ^ s->ch[ch].config) & (3 << 14)) /* DMAR | DMAW */ |
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omap_mcspi_dmarequest_update(s->ch + ch); |
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if (((value >> 12) & 3) == 3) /* TRM */ |
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fprintf(stderr, "%s: invalid TRM value (3)\n", __FUNCTION__);
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if (((value >> 7) & 0x1f) < 3) /* WL */ |
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fprintf(stderr, "%s: invalid WL value (%" PRIx64 ")\n", |
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__FUNCTION__, (value >> 7) & 0x1f); |
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s->ch[ch].config = value & 0x7fffff;
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break;
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case 0x70: ch ++; |
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/* fall through */
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case 0x5c: ch ++; |
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/* fall through */
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case 0x48: ch ++; |
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/* fall through */
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case 0x34: /* MCSPI_CHCTRL */ |
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if (value & ~s->ch[ch].control & 1) { /* EN */ |
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s->ch[ch].control |= 1;
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omap_mcspi_transfer_run(s, ch); |
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} else
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s->ch[ch].control = value & 1;
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break;
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case 0x74: ch ++; |
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/* fall through */
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case 0x60: ch ++; |
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/* fall through */
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case 0x4c: ch ++; |
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/* fall through */
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case 0x38: /* MCSPI_TX */ |
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s->ch[ch].tx = value; |
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s->ch[ch].status &= ~(1 << 1); /* TXS */ |
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omap_mcspi_transfer_run(s, ch); |
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break;
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default:
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OMAP_BAD_REG(addr); |
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return;
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} |
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} |
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static const MemoryRegionOps omap_mcspi_ops = { |
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.read = omap_mcspi_read, |
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.write = omap_mcspi_write, |
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.endianness = DEVICE_NATIVE_ENDIAN, |
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}; |
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struct omap_mcspi_s *omap_mcspi_init(struct omap_target_agent_s *ta, int chnum, |
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qemu_irq irq, qemu_irq *drq, omap_clk fclk, omap_clk iclk) |
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{
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struct omap_mcspi_s *s = (struct omap_mcspi_s *) |
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g_malloc0(sizeof(struct omap_mcspi_s)); |
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struct omap_mcspi_ch_s *ch = s->ch;
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s->irq = irq; |
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s->chnum = chnum; |
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while (chnum --) {
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ch->txdrq = *drq ++; |
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ch->rxdrq = *drq ++; |
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ch ++; |
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} |
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omap_mcspi_reset(s); |
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memory_region_init_io(&s->iomem, &omap_mcspi_ops, s, "omap.mcspi",
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omap_l4_region_size(ta, 0));
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omap_l4_attach(ta, 0, &s->iomem);
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return s;
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} |
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void omap_mcspi_attach(struct omap_mcspi_s *s, |
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uint32_t (*txrx)(void *opaque, uint32_t, int), void *opaque, |
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int chipselect)
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{
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if (chipselect < 0 || chipselect >= s->chnum) |
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hw_error("%s: Bad chipselect %i\n", __FUNCTION__, chipselect);
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s->ch[chipselect].txrx = txrx; |
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s->ch[chipselect].opaque = opaque; |
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} |