hw/omap2.c : separate spi module

Signed-off-by: cmchao <cmchao@gmail.com>
Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>

1 files changed, 346 insertions, 0 deletions

diff --git a/hw/omap_spi.c b/hw/omap_spi.c
new file mode 100644
index 0000000..a6b0349
--- /dev/null
+++ b/hw/omap_spi.c
@@ -0,0 +1,346 @@
+/*
+ * 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 "hw.h"
+#include "omap.h"
+
+/* Multichannel SPI */
+struct omap_mcspi_s {
+    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 uint32_t omap_mcspi_read(void *opaque, target_phys_addr_t addr)
+{
+    struct omap_mcspi_s *s = (struct omap_mcspi_s *) opaque;
+    int ch = 0;
+    uint32_t ret;
+
+    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 ++;
+    case 0x54: ch ++;
+    case 0x40: ch ++;
+    case 0x2c:	/* MCSPI_CHCONF */
+        return s->ch[ch].config;
+
+    case 0x6c: ch ++;
+    case 0x58: ch ++;
+    case 0x44: ch ++;
+    case 0x30:	/* MCSPI_CHSTAT */
+        return s->ch[ch].status;
+
+    case 0x70: ch ++;
+    case 0x5c: ch ++;
+    case 0x48: ch ++;
+    case 0x34:	/* MCSPI_CHCTRL */
+        return s->ch[ch].control;
+
+    case 0x74: ch ++;
+    case 0x60: ch ++;
+    case 0x4c: ch ++;
+    case 0x38:	/* MCSPI_TX */
+        return s->ch[ch].tx;
+
+    case 0x78: ch ++;
+    case 0x64: ch ++;
+    case 0x50: ch ++;
+    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, target_phys_addr_t addr,
+                uint32_t value)
+{
+    struct omap_mcspi_s *s = (struct omap_mcspi_s *) opaque;
+    int ch = 0;
+
+    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 ++;
+    case 0x54: ch ++;
+    case 0x40: ch ++;
+    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 (%i)\n",
+                            __FUNCTION__, (value >> 7) & 0x1f);
+        s->ch[ch].config = value & 0x7fffff;
+        break;
+
+    case 0x70: ch ++;
+    case 0x5c: ch ++;
+    case 0x48: ch ++;
+    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 ++;
+    case 0x60: ch ++;
+    case 0x4c: ch ++;
+    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 CPUReadMemoryFunc * const omap_mcspi_readfn[] = {
+    omap_badwidth_read32,
+    omap_badwidth_read32,
+    omap_mcspi_read,
+};
+
+static CPUWriteMemoryFunc * const omap_mcspi_writefn[] = {
+    omap_badwidth_write32,
+    omap_badwidth_write32,
+    omap_mcspi_write,
+};
+
+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)
+{
+    int iomemtype;
+    struct omap_mcspi_s *s = (struct omap_mcspi_s *)
+            qemu_mallocz(sizeof(struct omap_mcspi_s));
+    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);
+
+    iomemtype = l4_register_io_memory(omap_mcspi_readfn,
+                    omap_mcspi_writefn, s);
+    omap_l4_attach(ta, 0, iomemtype);
+
+    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;
+}