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Date: Wed, 2 Apr 2014 17:50:16 +0200
From: Philipp Zabel <p.zabel@...gutronix.de>
To: netdev@...r.kernel.org
Cc: linux-kernel@...r.kernel.org,
"David S. Miller" <davem@...emloft.net>,
Frederic LAMBERT <frdrc66@...il.com>, kernel@...gutronix.de,
Philipp Zabel <p.zabel@...gutronix.de>
Subject: [PATCH] net: Micrel KSZ8864RMN 4-port managed switch support
This patch adds support for the Micrel KSZ8864RMN switch to the spi_ks8995
driver. The KSZ8864RMN switch has a wider 256-byte register space.
Signed-off-by: Philipp Zabel <p.zabel@...gutronix.de>
---
drivers/net/phy/spi_ks8995.c | 49 +++++++++++++++++++++++++++++++++++---------
1 file changed, 39 insertions(+), 10 deletions(-)
diff --git a/drivers/net/phy/spi_ks8995.c b/drivers/net/phy/spi_ks8995.c
index 4cf5fb9..ad4e028 100644
--- a/drivers/net/phy/spi_ks8995.c
+++ b/drivers/net/phy/spi_ks8995.c
@@ -1,5 +1,5 @@
/*
- * SPI driver for Micrel/Kendin KS8995M ethernet switch
+ * SPI driver for Micrel/Kendin KS8995M and KSZ8864RMN ethernet switches
*
* Copyright (C) 2008 Gabor Juhos <juhosg at openwrt.org>
*
@@ -70,7 +70,10 @@
#define KS8995_REG_IAD1 0x76 /* Indirect Access Data 1 */
#define KS8995_REG_IAD0 0x77 /* Indirect Access Data 0 */
+#define KSZ8864_REG_ID1 0xfe /* Chip ID in bit 7 */
+
#define KS8995_REGS_SIZE 0x80
+#define KSZ8864_REGS_SIZE 0x100
#define ID1_CHIPID_M 0xf
#define ID1_CHIPID_S 4
@@ -94,6 +97,7 @@ struct ks8995_switch {
struct spi_device *spi;
struct mutex lock;
struct ks8995_pdata *pdata;
+ unsigned int regs_size;
};
static inline u8 get_chip_id(u8 val)
@@ -216,11 +220,11 @@ static ssize_t ks8995_registers_read(struct file *filp, struct kobject *kobj,
dev = container_of(kobj, struct device, kobj);
ks8995 = dev_get_drvdata(dev);
- if (unlikely(off > KS8995_REGS_SIZE))
+ if (unlikely(off > ks8995->regs_size))
return 0;
- if ((off + count) > KS8995_REGS_SIZE)
- count = KS8995_REGS_SIZE - off;
+ if ((off + count) > ks8995->regs_size)
+ count = ks8995->regs_size - off;
if (unlikely(!count))
return count;
@@ -238,11 +242,11 @@ static ssize_t ks8995_registers_write(struct file *filp, struct kobject *kobj,
dev = container_of(kobj, struct device, kobj);
ks8995 = dev_get_drvdata(dev);
- if (unlikely(off >= KS8995_REGS_SIZE))
+ if (unlikely(off >= ks8995->regs_size))
return -EFBIG;
- if ((off + count) > KS8995_REGS_SIZE)
- count = KS8995_REGS_SIZE - off;
+ if ((off + count) > ks8995->regs_size)
+ count = ks8995->regs_size - off;
if (unlikely(!count))
return count;
@@ -306,6 +310,26 @@ static int ks8995_probe(struct spi_device *spi)
goto err_drvdata;
}
+ ks->regs_size = KS8995_REGS_SIZE;
+ if (get_chip_id(ids[1]) != CHIPID_M) {
+ u8 val;
+
+ /* Check if this is a KSZ8864RMN */
+ err = ks8995_read(ks, &val, KSZ8864_REG_ID1, sizeof(val));
+ if (err < 0) {
+ dev_err(&spi->dev,
+ "unable to read chip id register, err=%d\n",
+ err);
+ goto err_drvdata;
+ }
+ if ((val & 0x80) == 0) {
+ dev_err(&spi->dev, "unknown chip:%02x,0\n", ids[1]);
+ goto err_drvdata;
+ }
+ ks->regs_size = KSZ8864_REGS_SIZE;
+ ks8995_registers_attr.size = KSZ8864_REGS_SIZE;
+ }
+
err = ks8995_reset(ks);
if (err)
goto err_drvdata;
@@ -317,9 +341,14 @@ static int ks8995_probe(struct spi_device *spi)
goto err_drvdata;
}
- dev_info(&spi->dev, "KS89%02X device found, Chip ID:%01x, "
- "Revision:%01x\n", ids[0],
- get_chip_id(ids[1]), get_chip_rev(ids[1]));
+ if (get_chip_id(ids[1]) == CHIPID_M) {
+ dev_info(&spi->dev,
+ "KS8995 device found, Chip ID:%01x, Revision:%01x\n",
+ get_chip_id(ids[1]), get_chip_rev(ids[1]));
+ } else {
+ dev_info(&spi->dev, "KSZ8864 device found, Revision:%01x\n",
+ get_chip_rev(ids[1]));
+ }
return 0;
--
1.9.1
--
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