summaryrefslogtreecommitdiff
path: root/drivers/i2c/busses/scx200_acb.c
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/i2c/busses/scx200_acb.c')
-rw-r--r--drivers/i2c/busses/scx200_acb.c608
1 files changed, 608 insertions, 0 deletions
diff --git a/drivers/i2c/busses/scx200_acb.c b/drivers/i2c/busses/scx200_acb.c
new file mode 100644
index 000000000..0a7e410b6
--- /dev/null
+++ b/drivers/i2c/busses/scx200_acb.c
@@ -0,0 +1,608 @@
+/*
+ Copyright (c) 2001,2002 Christer Weinigel <wingel@nano-system.com>
+
+ National Semiconductor SCx200 ACCESS.bus support
+ Also supports the AMD CS5535 and AMD CS5536
+
+ Based on i2c-keywest.c which is:
+ Copyright (c) 2001 Benjamin Herrenschmidt <benh@kernel.crashing.org>
+ Copyright (c) 2000 Philip Edelbrock <phil@stimpy.netroedge.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 of the
+ License, or (at your option) any later version.
+
+ 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.
+*/
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/module.h>
+#include <linux/errno.h>
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/i2c.h>
+#include <linux/pci.h>
+#include <linux/platform_device.h>
+#include <linux/delay.h>
+#include <linux/mutex.h>
+#include <linux/slab.h>
+#include <linux/io.h>
+
+#include <linux/scx200.h>
+
+MODULE_AUTHOR("Christer Weinigel <wingel@nano-system.com>");
+MODULE_DESCRIPTION("NatSemi SCx200 ACCESS.bus Driver");
+MODULE_ALIAS("platform:cs5535-smb");
+MODULE_LICENSE("GPL");
+
+#define MAX_DEVICES 4
+static int base[MAX_DEVICES] = { 0x820, 0x840 };
+module_param_array(base, int, NULL, 0);
+MODULE_PARM_DESC(base, "Base addresses for the ACCESS.bus controllers");
+
+#define POLL_TIMEOUT (HZ/5)
+
+enum scx200_acb_state {
+ state_idle,
+ state_address,
+ state_command,
+ state_repeat_start,
+ state_quick,
+ state_read,
+ state_write,
+};
+
+static const char *scx200_acb_state_name[] = {
+ "idle",
+ "address",
+ "command",
+ "repeat_start",
+ "quick",
+ "read",
+ "write",
+};
+
+/* Physical interface */
+struct scx200_acb_iface {
+ struct scx200_acb_iface *next;
+ struct i2c_adapter adapter;
+ unsigned base;
+ struct mutex mutex;
+
+ /* State machine data */
+ enum scx200_acb_state state;
+ int result;
+ u8 address_byte;
+ u8 command;
+ u8 *ptr;
+ char needs_reset;
+ unsigned len;
+};
+
+/* Register Definitions */
+#define ACBSDA (iface->base + 0)
+#define ACBST (iface->base + 1)
+#define ACBST_SDAST 0x40 /* SDA Status */
+#define ACBST_BER 0x20
+#define ACBST_NEGACK 0x10 /* Negative Acknowledge */
+#define ACBST_STASTR 0x08 /* Stall After Start */
+#define ACBST_MASTER 0x02
+#define ACBCST (iface->base + 2)
+#define ACBCST_BB 0x02
+#define ACBCTL1 (iface->base + 3)
+#define ACBCTL1_STASTRE 0x80
+#define ACBCTL1_NMINTE 0x40
+#define ACBCTL1_ACK 0x10
+#define ACBCTL1_STOP 0x02
+#define ACBCTL1_START 0x01
+#define ACBADDR (iface->base + 4)
+#define ACBCTL2 (iface->base + 5)
+#define ACBCTL2_ENABLE 0x01
+
+/************************************************************************/
+
+static void scx200_acb_machine(struct scx200_acb_iface *iface, u8 status)
+{
+ const char *errmsg;
+
+ dev_dbg(&iface->adapter.dev, "state %s, status = 0x%02x\n",
+ scx200_acb_state_name[iface->state], status);
+
+ if (status & ACBST_BER) {
+ errmsg = "bus error";
+ goto error;
+ }
+ if (!(status & ACBST_MASTER)) {
+ errmsg = "not master";
+ goto error;
+ }
+ if (status & ACBST_NEGACK) {
+ dev_dbg(&iface->adapter.dev, "negative ack in state %s\n",
+ scx200_acb_state_name[iface->state]);
+
+ iface->state = state_idle;
+ iface->result = -ENXIO;
+
+ outb(inb(ACBCTL1) | ACBCTL1_STOP, ACBCTL1);
+ outb(ACBST_STASTR | ACBST_NEGACK, ACBST);
+
+ /* Reset the status register */
+ outb(0, ACBST);
+ return;
+ }
+
+ switch (iface->state) {
+ case state_idle:
+ dev_warn(&iface->adapter.dev, "interrupt in idle state\n");
+ break;
+
+ case state_address:
+ /* Do a pointer write first */
+ outb(iface->address_byte & ~1, ACBSDA);
+
+ iface->state = state_command;
+ break;
+
+ case state_command:
+ outb(iface->command, ACBSDA);
+
+ if (iface->address_byte & 1)
+ iface->state = state_repeat_start;
+ else
+ iface->state = state_write;
+ break;
+
+ case state_repeat_start:
+ outb(inb(ACBCTL1) | ACBCTL1_START, ACBCTL1);
+ /* fallthrough */
+
+ case state_quick:
+ if (iface->address_byte & 1) {
+ if (iface->len == 1)
+ outb(inb(ACBCTL1) | ACBCTL1_ACK, ACBCTL1);
+ else
+ outb(inb(ACBCTL1) & ~ACBCTL1_ACK, ACBCTL1);
+ outb(iface->address_byte, ACBSDA);
+
+ iface->state = state_read;
+ } else {
+ outb(iface->address_byte, ACBSDA);
+
+ iface->state = state_write;
+ }
+ break;
+
+ case state_read:
+ /* Set ACK if _next_ byte will be the last one */
+ if (iface->len == 2)
+ outb(inb(ACBCTL1) | ACBCTL1_ACK, ACBCTL1);
+ else
+ outb(inb(ACBCTL1) & ~ACBCTL1_ACK, ACBCTL1);
+
+ if (iface->len == 1) {
+ iface->result = 0;
+ iface->state = state_idle;
+ outb(inb(ACBCTL1) | ACBCTL1_STOP, ACBCTL1);
+ }
+
+ *iface->ptr++ = inb(ACBSDA);
+ --iface->len;
+
+ break;
+
+ case state_write:
+ if (iface->len == 0) {
+ iface->result = 0;
+ iface->state = state_idle;
+ outb(inb(ACBCTL1) | ACBCTL1_STOP, ACBCTL1);
+ break;
+ }
+
+ outb(*iface->ptr++, ACBSDA);
+ --iface->len;
+
+ break;
+ }
+
+ return;
+
+ error:
+ dev_err(&iface->adapter.dev,
+ "%s in state %s (addr=0x%02x, len=%d, status=0x%02x)\n", errmsg,
+ scx200_acb_state_name[iface->state], iface->address_byte,
+ iface->len, status);
+
+ iface->state = state_idle;
+ iface->result = -EIO;
+ iface->needs_reset = 1;
+}
+
+static void scx200_acb_poll(struct scx200_acb_iface *iface)
+{
+ u8 status;
+ unsigned long timeout;
+
+ timeout = jiffies + POLL_TIMEOUT;
+ while (1) {
+ status = inb(ACBST);
+
+ /* Reset the status register to avoid the hang */
+ outb(0, ACBST);
+
+ if ((status & (ACBST_SDAST|ACBST_BER|ACBST_NEGACK)) != 0) {
+ scx200_acb_machine(iface, status);
+ return;
+ }
+ if (time_after(jiffies, timeout))
+ break;
+ cpu_relax();
+ cond_resched();
+ }
+
+ dev_err(&iface->adapter.dev, "timeout in state %s\n",
+ scx200_acb_state_name[iface->state]);
+
+ iface->state = state_idle;
+ iface->result = -EIO;
+ iface->needs_reset = 1;
+}
+
+static void scx200_acb_reset(struct scx200_acb_iface *iface)
+{
+ /* Disable the ACCESS.bus device and Configure the SCL
+ frequency: 16 clock cycles */
+ outb(0x70, ACBCTL2);
+ /* Polling mode */
+ outb(0, ACBCTL1);
+ /* Disable slave address */
+ outb(0, ACBADDR);
+ /* Enable the ACCESS.bus device */
+ outb(inb(ACBCTL2) | ACBCTL2_ENABLE, ACBCTL2);
+ /* Free STALL after START */
+ outb(inb(ACBCTL1) & ~(ACBCTL1_STASTRE | ACBCTL1_NMINTE), ACBCTL1);
+ /* Send a STOP */
+ outb(inb(ACBCTL1) | ACBCTL1_STOP, ACBCTL1);
+ /* Clear BER, NEGACK and STASTR bits */
+ outb(ACBST_BER | ACBST_NEGACK | ACBST_STASTR, ACBST);
+ /* Clear BB bit */
+ outb(inb(ACBCST) | ACBCST_BB, ACBCST);
+}
+
+static s32 scx200_acb_smbus_xfer(struct i2c_adapter *adapter,
+ u16 address, unsigned short flags,
+ char rw, u8 command, int size,
+ union i2c_smbus_data *data)
+{
+ struct scx200_acb_iface *iface = i2c_get_adapdata(adapter);
+ int len;
+ u8 *buffer;
+ u16 cur_word;
+ int rc;
+
+ switch (size) {
+ case I2C_SMBUS_QUICK:
+ len = 0;
+ buffer = NULL;
+ break;
+
+ case I2C_SMBUS_BYTE:
+ len = 1;
+ buffer = rw ? &data->byte : &command;
+ break;
+
+ case I2C_SMBUS_BYTE_DATA:
+ len = 1;
+ buffer = &data->byte;
+ break;
+
+ case I2C_SMBUS_WORD_DATA:
+ len = 2;
+ cur_word = cpu_to_le16(data->word);
+ buffer = (u8 *)&cur_word;
+ break;
+
+ case I2C_SMBUS_I2C_BLOCK_DATA:
+ len = data->block[0];
+ if (len == 0 || len > I2C_SMBUS_BLOCK_MAX)
+ return -EINVAL;
+ buffer = &data->block[1];
+ break;
+
+ default:
+ return -EINVAL;
+ }
+
+ dev_dbg(&adapter->dev,
+ "size=%d, address=0x%x, command=0x%x, len=%d, read=%d\n",
+ size, address, command, len, rw);
+
+ if (!len && rw == I2C_SMBUS_READ) {
+ dev_dbg(&adapter->dev, "zero length read\n");
+ return -EINVAL;
+ }
+
+ mutex_lock(&iface->mutex);
+
+ iface->address_byte = (address << 1) | rw;
+ iface->command = command;
+ iface->ptr = buffer;
+ iface->len = len;
+ iface->result = -EINVAL;
+ iface->needs_reset = 0;
+
+ outb(inb(ACBCTL1) | ACBCTL1_START, ACBCTL1);
+
+ if (size == I2C_SMBUS_QUICK || size == I2C_SMBUS_BYTE)
+ iface->state = state_quick;
+ else
+ iface->state = state_address;
+
+ while (iface->state != state_idle)
+ scx200_acb_poll(iface);
+
+ if (iface->needs_reset)
+ scx200_acb_reset(iface);
+
+ rc = iface->result;
+
+ mutex_unlock(&iface->mutex);
+
+ if (rc == 0 && size == I2C_SMBUS_WORD_DATA && rw == I2C_SMBUS_READ)
+ data->word = le16_to_cpu(cur_word);
+
+#ifdef DEBUG
+ dev_dbg(&adapter->dev, "transfer done, result: %d", rc);
+ if (buffer) {
+ int i;
+ printk(" data:");
+ for (i = 0; i < len; ++i)
+ printk(" %02x", buffer[i]);
+ }
+ printk("\n");
+#endif
+
+ return rc;
+}
+
+static u32 scx200_acb_func(struct i2c_adapter *adapter)
+{
+ return I2C_FUNC_SMBUS_QUICK | I2C_FUNC_SMBUS_BYTE |
+ I2C_FUNC_SMBUS_BYTE_DATA | I2C_FUNC_SMBUS_WORD_DATA |
+ I2C_FUNC_SMBUS_I2C_BLOCK;
+}
+
+/* For now, we only handle combined mode (smbus) */
+static const struct i2c_algorithm scx200_acb_algorithm = {
+ .smbus_xfer = scx200_acb_smbus_xfer,
+ .functionality = scx200_acb_func,
+};
+
+static struct scx200_acb_iface *scx200_acb_list;
+static DEFINE_MUTEX(scx200_acb_list_mutex);
+
+static int scx200_acb_probe(struct scx200_acb_iface *iface)
+{
+ u8 val;
+
+ /* Disable the ACCESS.bus device and Configure the SCL
+ frequency: 16 clock cycles */
+ outb(0x70, ACBCTL2);
+
+ if (inb(ACBCTL2) != 0x70) {
+ pr_debug("ACBCTL2 readback failed\n");
+ return -ENXIO;
+ }
+
+ outb(inb(ACBCTL1) | ACBCTL1_NMINTE, ACBCTL1);
+
+ val = inb(ACBCTL1);
+ if (val) {
+ pr_debug("disabled, but ACBCTL1=0x%02x\n", val);
+ return -ENXIO;
+ }
+
+ outb(inb(ACBCTL2) | ACBCTL2_ENABLE, ACBCTL2);
+
+ outb(inb(ACBCTL1) | ACBCTL1_NMINTE, ACBCTL1);
+
+ val = inb(ACBCTL1);
+ if ((val & ACBCTL1_NMINTE) != ACBCTL1_NMINTE) {
+ pr_debug("enabled, but NMINTE won't be set, ACBCTL1=0x%02x\n",
+ val);
+ return -ENXIO;
+ }
+
+ return 0;
+}
+
+static struct scx200_acb_iface *scx200_create_iface(const char *text,
+ struct device *dev, int index)
+{
+ struct scx200_acb_iface *iface;
+ struct i2c_adapter *adapter;
+
+ iface = kzalloc(sizeof(*iface), GFP_KERNEL);
+ if (!iface)
+ return NULL;
+
+ adapter = &iface->adapter;
+ i2c_set_adapdata(adapter, iface);
+ snprintf(adapter->name, sizeof(adapter->name), "%s ACB%d", text, index);
+ adapter->owner = THIS_MODULE;
+ adapter->algo = &scx200_acb_algorithm;
+ adapter->class = I2C_CLASS_HWMON | I2C_CLASS_SPD;
+ adapter->dev.parent = dev;
+
+ mutex_init(&iface->mutex);
+
+ return iface;
+}
+
+static int scx200_acb_create(struct scx200_acb_iface *iface)
+{
+ struct i2c_adapter *adapter;
+ int rc;
+
+ adapter = &iface->adapter;
+
+ rc = scx200_acb_probe(iface);
+ if (rc) {
+ pr_warn("probe failed\n");
+ return rc;
+ }
+
+ scx200_acb_reset(iface);
+
+ if (i2c_add_adapter(adapter) < 0) {
+ pr_err("failed to register\n");
+ return -ENODEV;
+ }
+
+ if (!adapter->dev.parent) {
+ /* If there's no dev, we're tracking (ISA) ifaces manually */
+ mutex_lock(&scx200_acb_list_mutex);
+ iface->next = scx200_acb_list;
+ scx200_acb_list = iface;
+ mutex_unlock(&scx200_acb_list_mutex);
+ }
+
+ return 0;
+}
+
+static struct scx200_acb_iface *scx200_create_dev(const char *text,
+ unsigned long base, int index, struct device *dev)
+{
+ struct scx200_acb_iface *iface;
+ int rc;
+
+ iface = scx200_create_iface(text, dev, index);
+
+ if (iface == NULL)
+ return NULL;
+
+ if (!request_region(base, 8, iface->adapter.name)) {
+ pr_err("can't allocate io 0x%lx-0x%lx\n", base, base + 8 - 1);
+ goto errout_free;
+ }
+
+ iface->base = base;
+ rc = scx200_acb_create(iface);
+
+ if (rc == 0)
+ return iface;
+
+ release_region(base, 8);
+ errout_free:
+ kfree(iface);
+ return NULL;
+}
+
+static int scx200_probe(struct platform_device *pdev)
+{
+ struct scx200_acb_iface *iface;
+ struct resource *res;
+
+ res = platform_get_resource(pdev, IORESOURCE_IO, 0);
+ if (!res) {
+ dev_err(&pdev->dev, "can't fetch device resource info\n");
+ return -ENODEV;
+ }
+
+ iface = scx200_create_dev("CS5535", res->start, 0, &pdev->dev);
+ if (!iface)
+ return -EIO;
+
+ dev_info(&pdev->dev, "SCx200 device '%s' registered\n",
+ iface->adapter.name);
+ platform_set_drvdata(pdev, iface);
+
+ return 0;
+}
+
+static void scx200_cleanup_iface(struct scx200_acb_iface *iface)
+{
+ i2c_del_adapter(&iface->adapter);
+ release_region(iface->base, 8);
+ kfree(iface);
+}
+
+static int scx200_remove(struct platform_device *pdev)
+{
+ struct scx200_acb_iface *iface;
+
+ iface = platform_get_drvdata(pdev);
+ scx200_cleanup_iface(iface);
+
+ return 0;
+}
+
+static struct platform_driver scx200_pci_driver = {
+ .driver = {
+ .name = "cs5535-smb",
+ },
+ .probe = scx200_probe,
+ .remove = scx200_remove,
+};
+
+static const struct pci_device_id scx200_isa[] = {
+ { PCI_DEVICE(PCI_VENDOR_ID_NS, PCI_DEVICE_ID_NS_SCx200_BRIDGE) },
+ { PCI_DEVICE(PCI_VENDOR_ID_NS, PCI_DEVICE_ID_NS_SC1100_BRIDGE) },
+ { 0, }
+};
+
+static __init void scx200_scan_isa(void)
+{
+ int i;
+
+ if (!pci_dev_present(scx200_isa))
+ return;
+
+ for (i = 0; i < MAX_DEVICES; ++i) {
+ if (base[i] == 0)
+ continue;
+
+ /* XXX: should we care about failures? */
+ scx200_create_dev("SCx200", base[i], i, NULL);
+ }
+}
+
+static int __init scx200_acb_init(void)
+{
+ pr_debug("NatSemi SCx200 ACCESS.bus Driver\n");
+
+ /* First scan for ISA-based devices */
+ scx200_scan_isa(); /* XXX: should we care about errors? */
+
+ /* If at least one bus was created, init must succeed */
+ if (scx200_acb_list)
+ return 0;
+
+ /* No ISA devices; register the platform driver for PCI-based devices */
+ return platform_driver_register(&scx200_pci_driver);
+}
+
+static void __exit scx200_acb_cleanup(void)
+{
+ struct scx200_acb_iface *iface;
+
+ platform_driver_unregister(&scx200_pci_driver);
+
+ mutex_lock(&scx200_acb_list_mutex);
+ while ((iface = scx200_acb_list) != NULL) {
+ scx200_acb_list = iface->next;
+ mutex_unlock(&scx200_acb_list_mutex);
+
+ scx200_cleanup_iface(iface);
+
+ mutex_lock(&scx200_acb_list_mutex);
+ }
+ mutex_unlock(&scx200_acb_list_mutex);
+}
+
+module_init(scx200_acb_init);
+module_exit(scx200_acb_cleanup);
generated by cgit v1.2.3-54-g00ecf (git 2.45.2) at 2024-11-12 13:20:00 +0000