| lists.openwall.net | lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC | |
|
Open Source and information security mailing list archives
| ||
|
Message-Id: <1269886638-11025-3-git-send-email-s-jan@ti.com>
Date: Mon, 29 Mar 2010 20:17:18 +0200
From: Sebastien Jan <s-jan@...com>
To: netdev@...r.kernel.org, Ben Dooks <ben@...tec.co.uk>
Cc: Abraham Arce <x0066660@...com>, Sebastien Jan <s-jan@...com>
Subject: [RFC PATCH 2/2] ks8851: Support MAC address read from companion EEPROM
The patch adds the capability to read the MAC address stored in the
ks8851 companion EEPROM (if any) through debugfs.
cat <debugfs path>/ks8851/mac_eeprom
=> will output the MAC address stored in EEPROM
Note that this feature is supported from ks8851 controller revisions
greater than 0.
Signed-off-by: Sebastien Jan <s-jan@...com>
---
drivers/net/ks8851.c | 167 +++++++++++++++++++++++++++++++++++++++++++++++++-
1 files changed, 165 insertions(+), 2 deletions(-)
diff --git a/drivers/net/ks8851.c b/drivers/net/ks8851.c
index 4708598..187fb70 100644
--- a/drivers/net/ks8851.c
+++ b/drivers/net/ks8851.c
@@ -1271,6 +1271,116 @@ enum { /* EEPROM programming states */
};
/**
+ * ks8851_eeprom_read - read a 16bits word in ks8851 companion EEPROM
+ * @dev: The network device the PHY is on.
+ * addr: EEPROM address to read
+ *
+ * ks8851_eeprom_size: used to define the data coding length. Can be changed
+ * through debug-fs.
+ *
+ * Programs a read on the EEPROM using ks8851 EEPROM SW access feature.
+ * Warning: The READ feature is is not supported on ks8851 revision 0.
+ *
+ * Rough programming model:
+ * - on period start: set clock high and read value on bus
+ * - on period / 2: set clock low and program value on bus
+ * - start on period / 2
+ */
+unsigned int ks8851_eeprom_read(struct net_device *dev, unsigned int addr)
+{
+ struct ks8851_net *ks = netdev_priv(dev);
+ int eepcr;
+ int ctrl = EEPROM_OP_READ;
+ int state = EEPROM_CONTROL;
+ int bit_count = EEPROM_OP_LEN - 1;
+ unsigned int data = 0;
+ int dummy;
+ unsigned int addr_len;
+
+ addr_len = (ks8851_eeprom_size == 1) ? 6 : 8;
+
+ /* start transaction: chip select high, authorize write */
+ mutex_lock(&ks->lock);
+ eepcr = EEPCR_EESA | EEPCR_EESRWA;
+ ks8851_wrreg16(ks, KS_EEPCR, eepcr);
+ eepcr |= EEPCR_EECS;
+ ks8851_wrreg16(ks, KS_EEPCR, eepcr);
+ mutex_unlock(&ks->lock);
+
+ while (state != EEPROM_COMPLETE) {
+ /* falling clock period starts... */
+ /* set EED_IO pin for control and address */
+ eepcr &= ~EEPCR_EEDO;
+ switch (state) {
+ case EEPROM_CONTROL:
+ eepcr |= ((ctrl >> bit_count) & 1) << 2;
+ if (bit_count-- <= 0) {
+ bit_count = addr_len - 1;
+ state = EEPROM_ADDRESS;
+ }
+ break;
+ case EEPROM_ADDRESS:
+ eepcr |= ((addr >> bit_count) & 1) << 2;
+ bit_count--;
+ break;
+ case EEPROM_DATA:
+ /* Change to receive mode */
+ eepcr &= ~EEPCR_EESRWA;
+ break;
+ }
+
+ /* lower clock */
+ eepcr &= ~EEPCR_EESCK;
+
+ mutex_lock(&ks->lock);
+ ks8851_wrreg16(ks, KS_EEPCR, eepcr);
+ mutex_unlock(&ks->lock);
+
+ /* waitread period / 2 */
+ udelay(EEPROM_SK_PERIOD / 2);
+
+ /* rising clock period starts... */
+
+ /* raise clock */
+ mutex_lock(&ks->lock);
+ eepcr |= EEPCR_EESCK;
+ ks8851_wrreg16(ks, KS_EEPCR, eepcr);
+ mutex_unlock(&ks->lock);
+
+ /* Manage read */
+ switch (state) {
+ case EEPROM_ADDRESS:
+ if (bit_count < 0) {
+ bit_count = EEPROM_DATA_LEN - 1;
+ state = EEPROM_DATA;
+ }
+ break;
+ case EEPROM_DATA:
+ mutex_lock(&ks->lock);
+ dummy = ks8851_rdreg16(ks, KS_EEPCR);
+ mutex_unlock(&ks->lock);
+ data |= ((dummy >> EEPCR_EESB_OFFSET) & 1) << bit_count;
+ if (bit_count-- <= 0)
+ state = EEPROM_COMPLETE;
+ break;
+ }
+
+ /* wait period / 2 */
+ udelay(EEPROM_SK_PERIOD / 2);
+ }
+
+ /* close transaction */
+ mutex_lock(&ks->lock);
+ eepcr &= ~EEPCR_EECS;
+ ks8851_wrreg16(ks, KS_EEPCR, eepcr);
+ eepcr = 0;
+ ks8851_wrreg16(ks, KS_EEPCR, eepcr);
+ mutex_unlock(&ks->lock);
+
+ return data;
+}
+
+/**
* ks8851_eeprom_write - write a 16bits word in ks8851 companion EEPROM
* @dev: The network device the PHY is on.
* op: operand (can be WRITE, EWEN, EWDS)
@@ -1379,6 +1489,52 @@ void ks8851_eeprom_write(struct net_device *dev, unsigned int op,
}
+/**
+ * ks8851_mac_eeprom_read - Read a MAC address in ks8851 companion EEPROM
+ *
+ * Warning: The READ feature is is not supported on ks8851 revision 0.
+ */
+static ssize_t ks8851_mac_eeprom_read(struct file *filep, char __user *buff,
+ size_t count, loff_t *offp)
+{
+ ssize_t ret;
+ struct net_device *dev = filep->private_data;
+ char str[50];
+ unsigned int data;
+ unsigned char mac_addr[6];
+
+ if (*offp > 0) {
+ ret = 0;
+ goto ks8851_cnt_rd_bk;
+ }
+
+ data = ks8851_eeprom_read(dev, 1);
+ mac_addr[5] = data & 0xFF;
+ mac_addr[4] = (data >> 8) & 0xFF;
+ data = ks8851_eeprom_read(dev, 2);
+ mac_addr[3] = data & 0xFF;
+ mac_addr[2] = (data >> 8) & 0xFF;
+ data = ks8851_eeprom_read(dev, 3);
+ mac_addr[1] = data & 0xFF;
+ mac_addr[0] = (data >> 8) & 0xFF;
+
+ sprintf(str, "%02x:%02x:%02x:%02x:%02x:%02x\n", mac_addr[0],
+ mac_addr[1], mac_addr[2], mac_addr[3], mac_addr[4],
+ mac_addr[5]);
+
+ ret = strlen(str);
+
+ if (copy_to_user((void __user *)buff, str, ret)) {
+ dev_err(&dev->dev, "ks8851 - copy_to_user failed\n");
+ ret = 0;
+ } else {
+ *offp = ret;
+ }
+
+ks8851_cnt_rd_bk:
+ return ret;
+}
+
/*
* Split the buffer `buf' into ':'-separated words.
* Return the number of words or <0 on error.
@@ -1473,7 +1629,7 @@ static ssize_t ks8851_mac_eeprom_write(struct file *filep,
static const struct file_operations ks8851_mac_eeprom_fops = {
.open = ks8851_mac_eeprom_open,
- .read = NULL,
+ .read = ks8851_mac_eeprom_read,
.write = ks8851_mac_eeprom_write,
.llseek = ks8851_mac_eeprom_seek,
.release = ks8851_mac_eeprom_release,
@@ -1482,13 +1638,20 @@ static const struct file_operations ks8851_mac_eeprom_fops = {
int __init ks8851_debug_init(struct net_device *dev)
{
struct ks8851_net *ks = netdev_priv(dev);
+ mode_t mac_access = S_IWUGO;
if (ks->rc_ccr & CCR_EEPROM) {
ks8851_dir = debugfs_create_dir("ks8851", NULL);
if (IS_ERR(ks8851_dir))
return PTR_ERR(ks8851_dir);
- debugfs_create_file("mac_eeprom", S_IWUGO, ks8851_dir, dev,
+ /* Check ks8851 version and features */
+ mutex_lock(&ks->lock);
+ if (CIDER_REV_GET(ks8851_rdreg16(ks, KS_CIDER)) > 0)
+ mac_access |= S_IRUGO;
+ mutex_unlock(&ks->lock);
+
+ debugfs_create_file("mac_eeprom", mac_access, ks8851_dir, dev,
&ks8851_mac_eeprom_fops);
debugfs_create_u32("eeprom_size", S_IRUGO | S_IWUGO,
ks8851_dir, &ks8851_eeprom_size);
--
1.6.3.3
--
To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Powered by blists - more mailing lists