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Date: Sun, 21 Jul 2013 18:27:53 +0200
From: Peter Wu <lekensteyn@...il.com>
To: Ben Hutchings <bhutchings@...arflare.com>
Cc: Francois Romieu <romieu@...zoreil.com>, netdev@...r.kernel.org,
Realtek linux nic maintainers <nic_swsd@...ltek.com>
Subject: Re: [RFC] EEPROM dumping/changing code for r8169 driver
On Sunday 21 July 2013 17:01:54 Ben Hutchings wrote:
> On Fri, 2013-07-19 at 11:48 +0200, Peter Wu wrote:
> > Hi,
> >
> > As noted in another mail, I have been working on adding EEPROM reading
> > writing support for the r8169 driver. The below diff adds basic support,
> > but it
> > is not completely finished yet:
> [...]
>
> > --- a/drivers/net/ethernet/realtek/Kconfig
> > +++ b/drivers/net/ethernet/realtek/Kconfig
> > @@ -112,4 +112,13 @@ config R8169
> >
> > To compile this driver as a module, choose M here: the module
> > will be called r8169. This is recommended.
> >
> > +config R8169_93CX6
> > + bool "Realtek 8169 external 93CX6 EEPROM support"
> > + depends on R8169
> > + select EEPROM_93CX6
>
> [...]
>
> This select is wrong as it will cause EEPROM_93CX6=y even if R8169=m.
> But why make this an option at all?
For this, I got inspiration from drivers/ethernet/8390/Kconfig which had an
AX88796_93CX6 option. Reading EEPROM is currently not a critical piece of
functionality, so I decided to make this optional. There seem also to be newer
hardware that use a two-wired serial interface for accessing EEPROM instead of
93C46/93C56/93C66. Would you suggest always including this code (distro
kernels should typically enable this) or making it optional? If optional, what
is the correct way to depend on EEPROM_93CX6? I think that this option will
be hidden in the R8169 menu until EEPROM_93CX6 is selected which might be
confusing if looking for this option.
Newer patch follows, I still need to figure out why it reads FFs on my onboard
RTL8111E NIC. (observation: accessing PCI memory resource2 via sysfs gives an
EIO error, `ethtool -d eth0` fails too and reads FFs).
Thanks,
Peter
---
diff --git a/drivers/net/ethernet/realtek/Kconfig b/drivers/net/ethernet/realtek/Kconfig
index ae5d027..68a1317 100644
--- a/drivers/net/ethernet/realtek/Kconfig
+++ b/drivers/net/ethernet/realtek/Kconfig
@@ -112,4 +112,13 @@ config R8169
To compile this driver as a module, choose M here: the module
will be called r8169. This is recommended.
+config R8169_93CX6
+ bool "Realtek 8169 external 93CX6 EEPROM support"
+ depends on R8169
+ select EEPROM_93CX6
+ ---help---
+ Select this if your want to access the 93C46/93C56/93C66 EEPROM of the
+ Realtek 8169 PCI Gigabit Ethernet adapter. This is necessary for
+ dumping or changing EEPROM using ethtool. If unsure, say N.
+
endif # NET_VENDOR_REALTEK
diff --git a/drivers/net/ethernet/realtek/r8169.c b/drivers/net/ethernet/realtek/r8169.c
index 880015c..d03d2ee 100644
--- a/drivers/net/ethernet/realtek/r8169.c
+++ b/drivers/net/ethernet/realtek/r8169.c
@@ -28,6 +28,7 @@
#include <linux/firmware.h>
#include <linux/pci-aspm.h>
#include <linux/prefetch.h>
+#include <linux/eeprom_93cx6.h>
#include <asm/io.h>
#include <asm/irq.h>
@@ -348,6 +349,7 @@ enum rtl_registers {
#define RXCFG_DMA_SHIFT 8
/* Unlimited maximum PCI burst. */
#define RX_DMA_BURST (7 << RXCFG_DMA_SHIFT)
+#define RX_9356SEL (1 << 6) /* EEPROM type */
RxMissed = 0x4c,
Cfg9346 = 0x50,
@@ -412,7 +414,8 @@ enum rtl8168_8101_registers {
DBG_REG = 0xd1,
#define FIX_NAK_1 (1 << 4)
#define FIX_NAK_2 (1 << 3)
- TWSI = 0xd2,
+ TWSI = 0xd2, /* Two Wire Serial Interface */
+#define TWSI_TYPE_EEPROM (1 << 2)
MCU = 0xd3,
#define NOW_IS_OOB (1 << 7)
#define TX_EMPTY (1 << 5)
@@ -504,8 +507,14 @@ enum rtl_register_content {
FSWInt = 0x01, /* Forced software interrupt */
/* Cfg9346Bits */
- Cfg9346_Lock = 0x00,
- Cfg9346_Unlock = 0xc0,
+ Cfg9346_Lock = (0 << 6), /* Normal communication mode */
+ Cfg9346_Program = (2 << 6), /* Programming mode */
+ Cfg9346_Unlock = (3 << 6), /* config register write enable */
+
+ Cfg9346_EECS = (1 << 3), /* Chip select */
+ Cfg9346_EESK = (1 << 2), /* Serial data clock */
+ Cfg9346_EEDI = (1 << 1), /* Data input */
+ Cfg9346_EEDO = (1 << 0), /* Data output */
/* rx_mode_bits */
AcceptErr = 0x20,
@@ -1643,6 +1652,152 @@ static int rtl8169_get_regs_len(struct net_device *dev)
return R8169_REGS_SIZE;
}
+#ifdef CONFIG_R8169_93CX6
+static int rtl8169_get_eeprom_len(struct net_device *dev) {
+ struct rtl8169_private *tp = netdev_priv(dev);
+ void __iomem *ioaddr = tp->mmio_addr;
+
+ if (RTL_R8(TWSI) & TWSI_TYPE_EEPROM)
+ return 0; /* 2-Wire Interface is unsupported for now */
+
+ /* 3-Wire Interface */
+ if (RTL_R8(RxConfig) & RX_9356SEL)
+ return 256; /* 93C56/93C66 */
+ else
+ return 128; /* 93C46 */
+}
+
+static void rtl_eeprom_read(struct eeprom_93cx6 *eeprom)
+{
+ struct rtl8169_private *tp = eeprom->data;
+ void __iomem *ioaddr = tp->mmio_addr;
+ u8 reg = RTL_R8(Cfg9346);
+
+ eeprom->reg_data_in = reg & Cfg9346_EEDI;
+ eeprom->reg_data_out = reg & Cfg9346_EEDO;
+ eeprom->reg_data_clock = reg & Cfg9346_EESK;
+ eeprom->reg_chip_select = reg & Cfg9346_EECS;
+}
+
+static void rtl_eeprom_write(struct eeprom_93cx6 *eeprom)
+{
+ struct rtl8169_private *tp = eeprom->data;
+ void __iomem *ioaddr = tp->mmio_addr;
+ u8 reg = Cfg9346_Program;
+
+ if (eeprom->reg_data_in)
+ reg |= Cfg9346_EEDI;
+ if (eeprom->reg_data_clock)
+ reg |= Cfg9346_EESK;
+ if (eeprom->reg_chip_select)
+ reg |= Cfg9346_EECS;
+
+ RTL_W8(Cfg9346, reg);
+ udelay(3); /* matches RTL_CLOCK_RATE in r8168 */
+}
+
+static void rtl_init_93cx6(struct net_device *dev, struct eeprom_93cx6 *eeprom)
+{
+ struct rtl8169_private *tp = netdev_priv(dev);
+ void __iomem *ioaddr = tp->mmio_addr;
+
+ eeprom->data = tp;
+ eeprom->register_read = rtl_eeprom_read;
+ eeprom->register_write = rtl_eeprom_write;
+
+ /* assume 3-Wire Interface, not TWI */
+ if (RTL_R8(RxConfig) & RX_9356SEL)
+ eeprom->width = PCI_EEPROM_WIDTH_93C56;
+ else
+ eeprom->width = PCI_EEPROM_WIDTH_93C46;
+}
+
+/* semi-randomly chosen magic for ethtool --change-eeprom option */
+#define R8169_EEPROM_MAGIC (0x00008169)
+
+static int rtl8169_get_eeprom(struct net_device *dev,
+ struct ethtool_eeprom *ee_eeprom, u8 *data)
+{
+ struct rtl8169_private *tp = netdev_priv(dev);
+ void __iomem *ioaddr = tp->mmio_addr;
+ struct eeprom_93cx6 eeprom;
+ int i = 0;
+ u8 offset = ee_eeprom->offset >> 1;
+ u16 val;
+
+ ee_eeprom->magic = R8169_EEPROM_MAGIC;
+
+ rtl_lock_work(tp);
+ rtl_init_93cx6(dev, &eeprom);
+
+ /* Do not use eeprom_93cx6_multiread, that returns data in an array of
+ * little endian words which is not compatible with BE arches. */
+
+ if (ee_eeprom->offset & 1) {
+ eeprom_93cx6_read(&eeprom, offset++, &val);
+ data[i++] = val >> 8;
+ }
+
+ while (i < ee_eeprom->len - 1) {
+ eeprom_93cx6_read(&eeprom, offset++, &val);
+ data[i++] = val & 0xFF;
+ data[i++] = val >> 8;
+ }
+
+ if (i < ee_eeprom->len) {
+ eeprom_93cx6_read(&eeprom, offset, &val);
+ data[i] = val & 0xFF;
+ }
+
+ RTL_W8(Cfg9346, Cfg9346_Lock);
+ rtl_unlock_work(tp);
+ return 0;
+}
+
+static int rtl8169_set_eeprom(struct net_device *dev,
+ struct ethtool_eeprom *ee_eeprom, u8 *data)
+{
+ struct rtl8169_private *tp = netdev_priv(dev);
+ void __iomem *ioaddr = tp->mmio_addr;
+ struct eeprom_93cx6 eeprom;
+ int i = 0;
+ u8 offset = ee_eeprom->offset >> 1;
+ u16 val;
+
+ if (ee_eeprom->magic != R8169_EEPROM_MAGIC)
+ return -EINVAL;
+
+ rtl_lock_work(tp);
+ rtl_init_93cx6(dev, &eeprom);
+ eeprom_93cx6_wren(&eeprom, true);
+
+ if (ee_eeprom->offset & 1) {
+ eeprom_93cx6_read(&eeprom, offset, &val);
+ val &= 0xFF;
+ val |= ((u16)data[i++]) << 8;
+ eeprom_93cx6_write(&eeprom, offset++, val);
+ }
+
+ while (i < ee_eeprom->len - 1) {
+ val = data[i++];
+ val |= ((u16)data[i++]) << 8;
+ eeprom_93cx6_write(&eeprom, offset++, val);
+ }
+
+ if (i < ee_eeprom->len) {
+ eeprom_93cx6_read(&eeprom, offset, &val);
+ val &= 0xFF00;
+ val |= data[i++];
+ eeprom_93cx6_write(&eeprom, offset, val);
+ }
+
+ eeprom_93cx6_wren(&eeprom, false);
+ RTL_W8(Cfg9346, Cfg9346_Lock);
+ rtl_unlock_work(tp);
+ return 0;
+}
+#endif
+
static int rtl8169_set_speed_tbi(struct net_device *dev,
u8 autoneg, u16 speed, u8 duplex, u32 ignored)
{
@@ -2024,6 +2179,11 @@ static const struct ethtool_ops rtl8169_ethtool_ops = {
.get_drvinfo = rtl8169_get_drvinfo,
.get_regs_len = rtl8169_get_regs_len,
.get_link = ethtool_op_get_link,
+#ifdef CONFIG_R8169_93CX6
+ .get_eeprom_len = rtl8169_get_eeprom_len,
+ .get_eeprom = rtl8169_get_eeprom,
+ .set_eeprom = rtl8169_set_eeprom,
+#endif
.get_settings = rtl8169_get_settings,
.set_settings = rtl8169_set_settings,
.get_msglevel = rtl8169_get_msglevel,
--
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