From adb86c372e1596c07437682ff7aa71c905dbc14f Mon Sep 17 00:00:00 2001
From: balrog <balrog@c046a42c-6fe2-441c-8c8c-71466251a162>
Date: Wed, 23 May 2007 22:04:23 +0000
Subject: Add WM8750 and MAX7310 chips (I2C slaves). Wolfson Microsystems
 WM8750 audio chip and Maxim MAX7310 gpio expander chip are used in the Spitz.

git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@2854 c046a42c-6fe2-441c-8c8c-71466251a162
---
 hw/max7310.c | 188 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 188 insertions(+)
 create mode 100644 hw/max7310.c

(limited to 'hw/max7310.c')

diff --git a/hw/max7310.c b/hw/max7310.c
new file mode 100644
index 000000000..a4aaf17d2
--- /dev/null
+++ b/hw/max7310.c
@@ -0,0 +1,188 @@
+/*
+ * MAX7310 8-port GPIO expansion chip.
+ *
+ * Copyright (c) 2006 Openedhand Ltd.
+ * Written by Andrzej Zaborowski <balrog@zabor.org>
+ *
+ * This file is licensed under GNU GPL.
+ */
+
+#include "vl.h"
+
+struct max7310_s {
+    i2c_slave i2c;
+    int i2c_command_byte;
+    int len;
+
+    uint8_t level;
+    uint8_t direction;
+    uint8_t polarity;
+    uint8_t status;
+    uint8_t command;
+    qemu_irq handler[8];
+    qemu_irq *gpio_in;
+};
+
+void max7310_reset(i2c_slave *i2c)
+{
+    struct max7310_s *s = (struct max7310_s *) i2c;
+    s->level &= s->direction;
+    s->direction = 0xff;
+    s->polarity = 0xf0;
+    s->status = 0x01;
+    s->command = 0x00;
+}
+
+static int max7310_rx(i2c_slave *i2c)
+{
+    struct max7310_s *s = (struct max7310_s *) i2c;
+
+    switch (s->command) {
+    case 0x00:	/* Input port */
+        return s->level ^ s->polarity;
+        break;
+
+    case 0x01:	/* Output port */
+        return s->level & ~s->direction;
+        break;
+
+    case 0x02:	/* Polarity inversion */
+        return s->polarity;
+
+    case 0x03:	/* Configuration */
+        return s->direction;
+
+    case 0x04:	/* Timeout */
+        return s->status;
+        break;
+
+    case 0xff:	/* Reserved */
+        return 0xff;
+
+    default:
+#ifdef VERBOSE
+        printf("%s: unknown register %02x\n", __FUNCTION__, s->command);
+#endif
+        break;
+    }
+    return 0xff;
+}
+
+static int max7310_tx(i2c_slave *i2c, uint8_t data)
+{
+    struct max7310_s *s = (struct max7310_s *) i2c;
+    uint8_t diff;
+    int line;
+
+    if (s->len ++ > 1) {
+#ifdef VERBOSE
+        printf("%s: message too long (%i bytes)\n", __FUNCTION__, s->len);
+#endif
+        return 1;
+    }
+
+    if (s->i2c_command_byte) {
+        s->command = data;
+        s->i2c_command_byte = 0;
+        return 0;
+    }
+
+    switch (s->command) {
+    case 0x01:	/* Output port */
+        for (diff = (data ^ s->level) & ~s->direction; diff;
+                        diff &= ~(1 << line)) {
+            line = ffs(diff) - 1;
+            if (s->handler[line])
+                qemu_set_irq(s->handler[line], (data >> line) & 1);
+        }
+        s->level = (s->level & s->direction) | (data & ~s->direction);
+        break;
+
+    case 0x02:	/* Polarity inversion */
+        s->polarity = data;
+        break;
+
+    case 0x03:	/* Configuration */
+        s->level &= ~(s->direction ^ data);
+        s->direction = data;
+        break;
+
+    case 0x04:	/* Timeout */
+        s->status = data;
+        break;
+
+    case 0x00:	/* Input port - ignore writes */
+	break;
+    default:
+#ifdef VERBOSE
+        printf("%s: unknown register %02x\n", __FUNCTION__, s->command);
+#endif
+        return 1;
+    }
+
+    return 0;
+}
+
+static void max7310_event(i2c_slave *i2c, enum i2c_event event)
+{
+    struct max7310_s *s = (struct max7310_s *) i2c;
+    s->len = 0;
+
+    switch (event) {
+    case I2C_START_SEND:
+        s->i2c_command_byte = 1;
+        break;
+    case I2C_FINISH:
+        if (s->len == 1)
+#ifdef VERBOSE
+            printf("%s: message too short (%i bytes)\n", __FUNCTION__, s->len);
+#endif
+        break;
+    default:
+        break;
+    }
+}
+
+static void max7310_gpio_set(void *opaque, int line, int level)
+{
+    struct max7310_s *s = (struct max7310_s *) opaque;
+    if (line >= sizeof(s->handler) / sizeof(*s->handler) || line  < 0)
+        cpu_abort(cpu_single_env, "bad GPIO line");
+
+    if (level)
+        s->level |= s->direction & (1 << line);
+    else
+        s->level &= ~(s->direction & (1 << line));
+}
+
+/* MAX7310 is SMBus-compatible (can be used with only SMBus protocols),
+ * but also accepts sequences that are not SMBus so return an I2C device.  */
+struct i2c_slave *max7310_init(i2c_bus *bus)
+{
+    struct max7310_s *s = (struct max7310_s *)
+            i2c_slave_init(bus, 0, sizeof(struct max7310_s));
+    s->i2c.event = max7310_event;
+    s->i2c.recv = max7310_rx;
+    s->i2c.send = max7310_tx;
+    s->gpio_in = qemu_allocate_irqs(max7310_gpio_set, s,
+                    sizeof(s->handler) / sizeof(*s->handler));
+
+    max7310_reset(&s->i2c);
+
+    return &s->i2c;
+}
+
+qemu_irq *max7310_gpio_in_get(i2c_slave *i2c)
+{
+    struct max7310_s *s = (struct max7310_s *) i2c;
+    return s->gpio_in;
+}
+
+void max7310_gpio_out_set(i2c_slave *i2c, int line, qemu_irq handler)
+{
+    struct max7310_s *s = (struct max7310_s *) i2c;
+    if (line >= sizeof(s->handler) / sizeof(*s->handler) || line  < 0)
+        cpu_abort(cpu_single_env, "bad GPIO line");
+
+    s->handler[line] = handler;
+}
-- 
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