PIIX4 SMBus host, EEPROM device emulation, by Ed Swierk.

git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@2379 c046a42c-6fe2-441c-8c8c-71466251a162

4 files changed, 323 insertions, 0 deletions

diff --git a/hw/acpi.c b/hw/acpi.c
index ce16531fbf..78c4feabbf 100644
--- a/hw/acpi.c
+++ b/hw/acpi.c
@@ -24,6 +24,7 @@
 #define PM_FREQ 3579545
 
 #define ACPI_DBG_IO_ADDR  0xb044
+#define SMB_IO_BASE       0xb100
 
 typedef struct PIIX4PMState {
     PCIDevice dev;
@@ -34,6 +35,15 @@ typedef struct PIIX4PMState {
     uint8_t apms;
     QEMUTimer *tmr_timer;
     int64_t tmr_overflow_time;
+    SMBusDevice *smb_dev[128];
+    uint8_t smb_stat;
+    uint8_t smb_ctl;
+    uint8_t smb_cmd;
+    uint8_t smb_addr;
+    uint8_t smb_data0;
+    uint8_t smb_data1;
+    uint8_t smb_data[32];
+    uint8_t smb_index;
 } PIIX4PMState;
 
 #define RTC_EN (1 << 10)
@@ -45,6 +55,17 @@ typedef struct PIIX4PMState {
 
 #define SUS_EN (1 << 13)
 
+#define SMBHSTSTS 0x00
+#define SMBHSTCNT 0x02
+#define SMBHSTCMD 0x03
+#define SMBHSTADD 0x04
+#define SMBHSTDAT0 0x05
+#define SMBHSTDAT1 0x06
+#define SMBBLKDAT 0x07
+
+/* Note: only used for piix4_smbus_register_device */
+static PIIX4PMState *piix4_pm_state;
+
 static uint32_t get_pmtmr(PIIX4PMState *s)
 {
     uint32_t d;
@@ -231,6 +252,156 @@ static void acpi_dbg_writel(void *opaque, uint32_t addr, uint32_t val)
 #endif
 }
 
+static void smb_transaction(PIIX4PMState *s)
+{
+    uint8_t prot = (s->smb_ctl >> 2) & 0x07;
+    uint8_t read = s->smb_addr & 0x01;
+    uint8_t cmd = s->smb_cmd;
+    uint8_t addr = s->smb_addr >> 1;
+    SMBusDevice *dev = s->smb_dev[addr];
+
+#ifdef DEBUG
+    printf("SMBus trans addr=0x%02x prot=0x%02x\n", addr, prot);
+#endif
+    if (!dev) goto error;
+
+    switch(prot) {
+    case 0x0:
+        if (!dev->quick_cmd) goto error;
+        (*dev->quick_cmd)(dev, read);
+        break;
+    case 0x1:
+        if (read) {
+            if (!dev->receive_byte) goto error;
+            s->smb_data0 = (*dev->receive_byte)(dev);
+        }
+        else {
+            if (!dev->send_byte) goto error;
+            (*dev->send_byte)(dev, cmd);
+        }
+        break;
+    case 0x2:
+        if (read) {
+            if (!dev->read_byte) goto error;
+            s->smb_data0 = (*dev->read_byte)(dev, cmd);
+        }
+        else {
+            if (!dev->write_byte) goto error;
+            (*dev->write_byte)(dev, cmd, s->smb_data0);
+        }
+        break;
+    case 0x3:
+        if (read) {
+            uint16_t val;
+            if (!dev->read_word) goto error;
+            val = (*dev->read_word)(dev, cmd);
+            s->smb_data0 = val;
+            s->smb_data1 = val >> 8;
+        }
+        else {
+            if (!dev->write_word) goto error;
+            (*dev->write_word)(dev, cmd, (s->smb_data1 << 8) | s->smb_data0);
+        }
+        break;
+    case 0x5:
+        if (read) {
+            if (!dev->read_block) goto error;
+            s->smb_data0 = (*dev->read_block)(dev, cmd, s->smb_data);
+        }
+        else {
+            if (!dev->write_block) goto error;
+            (*dev->write_block)(dev, cmd, s->smb_data0, s->smb_data);
+        }
+        break;
+    default:
+        goto error;
+    }
+    return;
+
+  error:
+    s->smb_stat |= 0x04;
+}
+
+static void smb_ioport_writeb(void *opaque, uint32_t addr, uint32_t val)
+{
+    PIIX4PMState *s = opaque;
+    addr &= 0x3f;
+#ifdef DEBUG
+    printf("SMB writeb port=0x%04x val=0x%02x\n", addr, val);
+#endif
+    switch(addr) {
+    case SMBHSTSTS:
+        s->smb_stat = 0;
+        s->smb_index = 0;
+        break;
+    case SMBHSTCNT:
+        s->smb_ctl = val;
+        if (val & 0x40)
+            smb_transaction(s);
+        break;
+    case SMBHSTCMD:
+        s->smb_cmd = val;
+        break;
+    case SMBHSTADD:
+        s->smb_addr = val;
+        break;
+    case SMBHSTDAT0:
+        s->smb_data0 = val;
+        break;
+    case SMBHSTDAT1:
+        s->smb_data1 = val;
+        break;
+    case SMBBLKDAT:
+        s->smb_data[s->smb_index++] = val;
+        if (s->smb_index > 31)
+            s->smb_index = 0;
+        break;
+    default:
+        break;
+    }
+}
+
+static uint32_t smb_ioport_readb(void *opaque, uint32_t addr)
+{
+    PIIX4PMState *s = opaque;
+    uint32_t val;
+
+    addr &= 0x3f;
+    switch(addr) {
+    case SMBHSTSTS:
+        val = s->smb_stat;
+        break;
+    case SMBHSTCNT:
+        s->smb_index = 0;
+        val = s->smb_ctl & 0x1f;
+        break;
+    case SMBHSTCMD:
+        val = s->smb_cmd;
+        break;
+    case SMBHSTADD:
+        val = s->smb_addr;
+        break;
+    case SMBHSTDAT0:
+        val = s->smb_data0;
+        break;
+    case SMBHSTDAT1:
+        val = s->smb_data1;
+        break;
+    case SMBBLKDAT:
+        val = s->smb_data[s->smb_index++];
+        if (s->smb_index > 31)
+            s->smb_index = 0;
+        break;
+    default:
+        val = 0;
+        break;
+    }
+#ifdef DEBUG
+    printf("SMB readb port=0x%04x val=0x%02x\n", addr, val);
+#endif
+    return val;
+}
+
 static void pm_io_space_update(PIIX4PMState *s)
 {
     uint32_t pm_io_base;
@@ -302,6 +473,7 @@ void piix4_pm_init(PCIBus *bus, int devfn)
 {
     PIIX4PMState *s;
     uint8_t *pci_conf;
+    uint32_t pm_io_base, smb_io_base;
 
     s = (PIIX4PMState *)pci_register_device(bus,
                                          "PM", sizeof(PIIX4PMState),
@@ -332,7 +504,20 @@ void piix4_pm_init(PCIBus *bus, int devfn)
     pci_conf[0x67] = (serial_hds[0] != NULL ? 0x08 : 0) |
 	(serial_hds[1] != NULL ? 0x90 : 0);
 
+    smb_io_base = SMB_IO_BASE;
+    pci_conf[0x90] = smb_io_base | 1;
+    pci_conf[0x91] = smb_io_base >> 8;
+    pci_conf[0xd2] = 0x09;
+    register_ioport_write(smb_io_base, 64, 1, smb_ioport_writeb, s);
+    register_ioport_read(smb_io_base, 64, 1, smb_ioport_readb, s);
+
     s->tmr_timer = qemu_new_timer(vm_clock, pm_tmr_timer, s);
 
     register_savevm("piix4_pm", 0, 1, pm_save, pm_load, s);
+    piix4_pm_state = s;
+}
+
+void piix4_smbus_register_device(SMBusDevice *dev, uint8_t addr)
+{
+    piix4_pm_state->smb_dev[addr] = dev;
 }
diff --git a/hw/pc.c b/hw/pc.c
index 73f7609ae9..05802bca97 100644
--- a/hw/pc.c
+++ b/hw/pc.c
@@ -699,7 +699,13 @@ static void pc_init1(int ram_size, int vga_ram_size, int boot_device,
     }
 
     if (pci_enabled && acpi_enabled) {
+        uint8_t *eeprom_buf = qemu_mallocz(8 * 256); /* XXX: make this persistent */
         piix4_pm_init(pci_bus, piix3_devfn + 3);
+        for (i = 0; i < 8; i++) {
+            SMBusDevice *eeprom = smbus_eeprom_device_init(0x50 + i,
+                eeprom_buf + (i * 256));
+            piix4_smbus_register_device(eeprom, 0x50 + i);
+        }
     }
     
     if (i440fx_state) {
diff --git a/hw/smbus.h b/hw/smbus.h
new file mode 100644
index 0000000000..76fc3c8395
--- /dev/null
+++ b/hw/smbus.h
@@ -0,0 +1,38 @@
+/*
+ * QEMU SMBus API
+ * 
+ * Copyright (c) 2007 Arastra, Inc.
+ * 
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+typedef struct SMBusDevice SMBusDevice;
+
+struct SMBusDevice {
+    uint8_t addr;
+    void (*quick_cmd)(SMBusDevice *dev, uint8_t read);
+    void (*send_byte)(SMBusDevice *dev, uint8_t val);
+    uint8_t (*receive_byte)(SMBusDevice *dev);
+    void (*write_byte)(SMBusDevice *dev, uint8_t cmd, uint8_t val);
+    uint8_t (*read_byte)(SMBusDevice *dev, uint8_t cmd);
+    void (*write_word)(SMBusDevice *dev, uint8_t cmd, uint16_t val);
+    uint16_t (*read_word)(SMBusDevice *dev, uint8_t cmd);
+    void (*write_block)(SMBusDevice *dev, uint8_t cmd, uint8_t len, uint8_t *buf);
+    uint8_t (*read_block)(SMBusDevice *dev, uint8_t cmd, uint8_t *buf);
+};
diff --git a/hw/smbus_eeprom.c b/hw/smbus_eeprom.c
new file mode 100644
index 0000000000..d401b17565
--- /dev/null
+++ b/hw/smbus_eeprom.c
@@ -0,0 +1,94 @@
+/*
+ * QEMU SMBus EEPROM device
+ * 
+ * Copyright (c) 2007 Arastra, Inc.
+ * 
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#include "vl.h"
+
+//#define DEBUG
+
+typedef struct SMBusEEPROMDevice {
+    SMBusDevice dev;
+    uint8_t *data;
+    uint8_t offset;
+} SMBusEEPROMDevice;
+
+static void eeprom_quick_cmd(SMBusDevice *dev, uint8_t read)
+{
+#ifdef DEBUG
+    printf("eeprom_quick_cmd: addr=0x%02x read=%d\n", dev->addr, read);
+#endif
+}
+
+static void eeprom_send_byte(SMBusDevice *dev, uint8_t val)
+{
+    SMBusEEPROMDevice *eeprom = (SMBusEEPROMDevice *) dev;
+#ifdef DEBUG
+    printf("eeprom_send_byte: addr=0x%02x val=0x%02x\n", dev->addr, val);
+#endif
+    eeprom->offset = val;
+}
+
+static uint8_t eeprom_receive_byte(SMBusDevice *dev)
+{
+    SMBusEEPROMDevice *eeprom = (SMBusEEPROMDevice *) dev;
+    uint8_t val = eeprom->data[eeprom->offset++];
+#ifdef DEBUG
+    printf("eeprom_receive_byte: addr=0x%02x val=0x%02x\n", dev->addr, val);
+#endif
+    return val;
+}
+
+static void eeprom_write_byte(SMBusDevice *dev, uint8_t cmd, uint8_t val)
+{
+    SMBusEEPROMDevice *eeprom = (SMBusEEPROMDevice *) dev;
+#ifdef DEBUG
+    printf("eeprom_write_byte: addr=0x%02x cmd=0x%02x val=0x%02x\n", dev->addr,
+           cmd, val);
+#endif
+    eeprom->data[cmd] = val;
+}
+
+static uint8_t eeprom_read_byte(SMBusDevice *dev, uint8_t cmd)
+{
+    SMBusEEPROMDevice *eeprom = (SMBusEEPROMDevice *) dev;
+    uint8_t val = eeprom->data[cmd];
+#ifdef DEBUG
+    printf("eeprom_read_byte: addr=0x%02x cmd=0x%02x val=0x%02x\n", dev->addr,
+           cmd, val);
+#endif
+    return val;
+}
+
+SMBusDevice *smbus_eeprom_device_init(uint8_t addr, uint8_t *buf)
+{
+    SMBusEEPROMDevice *eeprom = qemu_mallocz(sizeof(SMBusEEPROMDevice));
+    eeprom->dev.addr = addr;
+    eeprom->dev.quick_cmd = eeprom_quick_cmd;
+    eeprom->dev.send_byte = eeprom_send_byte;
+    eeprom->dev.receive_byte = eeprom_receive_byte;
+    eeprom->dev.write_byte = eeprom_write_byte;
+    eeprom->dev.read_byte = eeprom_read_byte;
+    eeprom->data = buf;
+    eeprom->offset = 0;
+    return (SMBusDevice *) eeprom;
+}