summaryrefslogtreecommitdiffstats
path: root/kernel/drivers/net/phy/spi_ks8995.c
diff options
context:
space:
mode:
authorYunhong Jiang <yunhong.jiang@intel.com>2015-08-04 12:17:53 -0700
committerYunhong Jiang <yunhong.jiang@intel.com>2015-08-04 15:44:42 -0700
commit9ca8dbcc65cfc63d6f5ef3312a33184e1d726e00 (patch)
tree1c9cafbcd35f783a87880a10f85d1a060db1a563 /kernel/drivers/net/phy/spi_ks8995.c
parent98260f3884f4a202f9ca5eabed40b1354c489b29 (diff)
Add the rt linux 4.1.3-rt3 as base
Import the rt linux 4.1.3-rt3 as OPNFV kvm base. It's from git://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git linux-4.1.y-rt and the base is: commit 0917f823c59692d751951bf5ea699a2d1e2f26a2 Author: Sebastian Andrzej Siewior <bigeasy@linutronix.de> Date: Sat Jul 25 12:13:34 2015 +0200 Prepare v4.1.3-rt3 Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de> We lose all the git history this way and it's not good. We should apply another opnfv project repo in future. Change-Id: I87543d81c9df70d99c5001fbdf646b202c19f423 Signed-off-by: Yunhong Jiang <yunhong.jiang@intel.com>
Diffstat (limited to 'kernel/drivers/net/phy/spi_ks8995.c')
-rw-r--r--kernel/drivers/net/phy/spi_ks8995.c379
1 files changed, 379 insertions, 0 deletions
diff --git a/kernel/drivers/net/phy/spi_ks8995.c b/kernel/drivers/net/phy/spi_ks8995.c
new file mode 100644
index 000000000..465301592
--- /dev/null
+++ b/kernel/drivers/net/phy/spi_ks8995.c
@@ -0,0 +1,379 @@
+/*
+ * SPI driver for Micrel/Kendin KS8995M and KSZ8864RMN ethernet switches
+ *
+ * Copyright (C) 2008 Gabor Juhos <juhosg at openwrt.org>
+ *
+ * This file was based on: drivers/spi/at25.c
+ * Copyright (C) 2006 David Brownell
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 as published
+ * by the Free Software Foundation.
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/delay.h>
+#include <linux/device.h>
+
+#include <linux/spi/spi.h>
+
+#define DRV_VERSION "0.1.1"
+#define DRV_DESC "Micrel KS8995 Ethernet switch SPI driver"
+
+/* ------------------------------------------------------------------------ */
+
+#define KS8995_REG_ID0 0x00 /* Chip ID0 */
+#define KS8995_REG_ID1 0x01 /* Chip ID1 */
+
+#define KS8995_REG_GC0 0x02 /* Global Control 0 */
+#define KS8995_REG_GC1 0x03 /* Global Control 1 */
+#define KS8995_REG_GC2 0x04 /* Global Control 2 */
+#define KS8995_REG_GC3 0x05 /* Global Control 3 */
+#define KS8995_REG_GC4 0x06 /* Global Control 4 */
+#define KS8995_REG_GC5 0x07 /* Global Control 5 */
+#define KS8995_REG_GC6 0x08 /* Global Control 6 */
+#define KS8995_REG_GC7 0x09 /* Global Control 7 */
+#define KS8995_REG_GC8 0x0a /* Global Control 8 */
+#define KS8995_REG_GC9 0x0b /* Global Control 9 */
+
+#define KS8995_REG_PC(p, r) ((0x10 * p) + r) /* Port Control */
+#define KS8995_REG_PS(p, r) ((0x10 * p) + r + 0xe) /* Port Status */
+
+#define KS8995_REG_TPC0 0x60 /* TOS Priority Control 0 */
+#define KS8995_REG_TPC1 0x61 /* TOS Priority Control 1 */
+#define KS8995_REG_TPC2 0x62 /* TOS Priority Control 2 */
+#define KS8995_REG_TPC3 0x63 /* TOS Priority Control 3 */
+#define KS8995_REG_TPC4 0x64 /* TOS Priority Control 4 */
+#define KS8995_REG_TPC5 0x65 /* TOS Priority Control 5 */
+#define KS8995_REG_TPC6 0x66 /* TOS Priority Control 6 */
+#define KS8995_REG_TPC7 0x67 /* TOS Priority Control 7 */
+
+#define KS8995_REG_MAC0 0x68 /* MAC address 0 */
+#define KS8995_REG_MAC1 0x69 /* MAC address 1 */
+#define KS8995_REG_MAC2 0x6a /* MAC address 2 */
+#define KS8995_REG_MAC3 0x6b /* MAC address 3 */
+#define KS8995_REG_MAC4 0x6c /* MAC address 4 */
+#define KS8995_REG_MAC5 0x6d /* MAC address 5 */
+
+#define KS8995_REG_IAC0 0x6e /* Indirect Access Control 0 */
+#define KS8995_REG_IAC1 0x6f /* Indirect Access Control 0 */
+#define KS8995_REG_IAD7 0x70 /* Indirect Access Data 7 */
+#define KS8995_REG_IAD6 0x71 /* Indirect Access Data 6 */
+#define KS8995_REG_IAD5 0x72 /* Indirect Access Data 5 */
+#define KS8995_REG_IAD4 0x73 /* Indirect Access Data 4 */
+#define KS8995_REG_IAD3 0x74 /* Indirect Access Data 3 */
+#define KS8995_REG_IAD2 0x75 /* Indirect Access Data 2 */
+#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
+#define ID1_REVISION_M 0x7
+#define ID1_REVISION_S 1
+#define ID1_START_SW 1 /* start the switch */
+
+#define FAMILY_KS8995 0x95
+#define CHIPID_M 0
+
+#define KS8995_CMD_WRITE 0x02U
+#define KS8995_CMD_READ 0x03U
+
+#define KS8995_RESET_DELAY 10 /* usec */
+
+struct ks8995_pdata {
+ /* not yet implemented */
+};
+
+struct ks8995_switch {
+ struct spi_device *spi;
+ struct mutex lock;
+ struct ks8995_pdata *pdata;
+ struct bin_attribute regs_attr;
+};
+
+static inline u8 get_chip_id(u8 val)
+{
+ return (val >> ID1_CHIPID_S) & ID1_CHIPID_M;
+}
+
+static inline u8 get_chip_rev(u8 val)
+{
+ return (val >> ID1_REVISION_S) & ID1_REVISION_M;
+}
+
+/* ------------------------------------------------------------------------ */
+static int ks8995_read(struct ks8995_switch *ks, char *buf,
+ unsigned offset, size_t count)
+{
+ u8 cmd[2];
+ struct spi_transfer t[2];
+ struct spi_message m;
+ int err;
+
+ spi_message_init(&m);
+
+ memset(&t, 0, sizeof(t));
+
+ t[0].tx_buf = cmd;
+ t[0].len = sizeof(cmd);
+ spi_message_add_tail(&t[0], &m);
+
+ t[1].rx_buf = buf;
+ t[1].len = count;
+ spi_message_add_tail(&t[1], &m);
+
+ cmd[0] = KS8995_CMD_READ;
+ cmd[1] = offset;
+
+ mutex_lock(&ks->lock);
+ err = spi_sync(ks->spi, &m);
+ mutex_unlock(&ks->lock);
+
+ return err ? err : count;
+}
+
+
+static int ks8995_write(struct ks8995_switch *ks, char *buf,
+ unsigned offset, size_t count)
+{
+ u8 cmd[2];
+ struct spi_transfer t[2];
+ struct spi_message m;
+ int err;
+
+ spi_message_init(&m);
+
+ memset(&t, 0, sizeof(t));
+
+ t[0].tx_buf = cmd;
+ t[0].len = sizeof(cmd);
+ spi_message_add_tail(&t[0], &m);
+
+ t[1].tx_buf = buf;
+ t[1].len = count;
+ spi_message_add_tail(&t[1], &m);
+
+ cmd[0] = KS8995_CMD_WRITE;
+ cmd[1] = offset;
+
+ mutex_lock(&ks->lock);
+ err = spi_sync(ks->spi, &m);
+ mutex_unlock(&ks->lock);
+
+ return err ? err : count;
+}
+
+static inline int ks8995_read_reg(struct ks8995_switch *ks, u8 addr, u8 *buf)
+{
+ return ks8995_read(ks, buf, addr, 1) != 1;
+}
+
+static inline int ks8995_write_reg(struct ks8995_switch *ks, u8 addr, u8 val)
+{
+ char buf = val;
+
+ return ks8995_write(ks, &buf, addr, 1) != 1;
+}
+
+/* ------------------------------------------------------------------------ */
+
+static int ks8995_stop(struct ks8995_switch *ks)
+{
+ return ks8995_write_reg(ks, KS8995_REG_ID1, 0);
+}
+
+static int ks8995_start(struct ks8995_switch *ks)
+{
+ return ks8995_write_reg(ks, KS8995_REG_ID1, 1);
+}
+
+static int ks8995_reset(struct ks8995_switch *ks)
+{
+ int err;
+
+ err = ks8995_stop(ks);
+ if (err)
+ return err;
+
+ udelay(KS8995_RESET_DELAY);
+
+ return ks8995_start(ks);
+}
+
+/* ------------------------------------------------------------------------ */
+
+static ssize_t ks8995_registers_read(struct file *filp, struct kobject *kobj,
+ struct bin_attribute *bin_attr, char *buf, loff_t off, size_t count)
+{
+ struct device *dev;
+ struct ks8995_switch *ks8995;
+
+ dev = container_of(kobj, struct device, kobj);
+ ks8995 = dev_get_drvdata(dev);
+
+ if (unlikely(off > ks8995->regs_attr.size))
+ return 0;
+
+ if ((off + count) > ks8995->regs_attr.size)
+ count = ks8995->regs_attr.size - off;
+
+ if (unlikely(!count))
+ return count;
+
+ return ks8995_read(ks8995, buf, off, count);
+}
+
+
+static ssize_t ks8995_registers_write(struct file *filp, struct kobject *kobj,
+ struct bin_attribute *bin_attr, char *buf, loff_t off, size_t count)
+{
+ struct device *dev;
+ struct ks8995_switch *ks8995;
+
+ dev = container_of(kobj, struct device, kobj);
+ ks8995 = dev_get_drvdata(dev);
+
+ if (unlikely(off >= ks8995->regs_attr.size))
+ return -EFBIG;
+
+ if ((off + count) > ks8995->regs_attr.size)
+ count = ks8995->regs_attr.size - off;
+
+ if (unlikely(!count))
+ return count;
+
+ return ks8995_write(ks8995, buf, off, count);
+}
+
+
+static const struct bin_attribute ks8995_registers_attr = {
+ .attr = {
+ .name = "registers",
+ .mode = S_IRUSR | S_IWUSR,
+ },
+ .size = KS8995_REGS_SIZE,
+ .read = ks8995_registers_read,
+ .write = ks8995_registers_write,
+};
+
+/* ------------------------------------------------------------------------ */
+
+static int ks8995_probe(struct spi_device *spi)
+{
+ struct ks8995_switch *ks;
+ struct ks8995_pdata *pdata;
+ u8 ids[2];
+ int err;
+
+ /* Chip description */
+ pdata = spi->dev.platform_data;
+
+ ks = devm_kzalloc(&spi->dev, sizeof(*ks), GFP_KERNEL);
+ if (!ks)
+ return -ENOMEM;
+
+ mutex_init(&ks->lock);
+ ks->pdata = pdata;
+ ks->spi = spi_dev_get(spi);
+ spi_set_drvdata(spi, ks);
+
+ spi->mode = SPI_MODE_0;
+ spi->bits_per_word = 8;
+ err = spi_setup(spi);
+ if (err) {
+ dev_err(&spi->dev, "spi_setup failed, err=%d\n", err);
+ return err;
+ }
+
+ err = ks8995_read(ks, ids, KS8995_REG_ID0, sizeof(ids));
+ if (err < 0) {
+ dev_err(&spi->dev, "unable to read id registers, err=%d\n",
+ err);
+ return err;
+ }
+
+ switch (ids[0]) {
+ case FAMILY_KS8995:
+ break;
+ default:
+ dev_err(&spi->dev, "unknown family id:%02x\n", ids[0]);
+ return -ENODEV;
+ }
+
+ memcpy(&ks->regs_attr, &ks8995_registers_attr, sizeof(ks->regs_attr));
+ 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);
+ return err;
+ }
+ if ((val & 0x80) == 0) {
+ dev_err(&spi->dev, "unknown chip:%02x,0\n", ids[1]);
+ return err;
+ }
+ ks->regs_attr.size = KSZ8864_REGS_SIZE;
+ }
+
+ err = ks8995_reset(ks);
+ if (err)
+ return err;
+
+ err = sysfs_create_bin_file(&spi->dev.kobj, &ks->regs_attr);
+ if (err) {
+ dev_err(&spi->dev, "unable to create sysfs file, err=%d\n",
+ err);
+ return err;
+ }
+
+ if (get_chip_id(ids[1]) == CHIPID_M) {
+ dev_info(&spi->dev,
+ "KS8995 device found, Chip ID:%x, Revision:%x\n",
+ get_chip_id(ids[1]), get_chip_rev(ids[1]));
+ } else {
+ dev_info(&spi->dev, "KSZ8864 device found, Revision:%x\n",
+ get_chip_rev(ids[1]));
+ }
+
+ return 0;
+}
+
+static int ks8995_remove(struct spi_device *spi)
+{
+ struct ks8995_switch *ks = spi_get_drvdata(spi);
+
+ sysfs_remove_bin_file(&spi->dev.kobj, &ks->regs_attr);
+
+ return 0;
+}
+
+/* ------------------------------------------------------------------------ */
+
+static struct spi_driver ks8995_driver = {
+ .driver = {
+ .name = "spi-ks8995",
+ .owner = THIS_MODULE,
+ },
+ .probe = ks8995_probe,
+ .remove = ks8995_remove,
+};
+
+module_spi_driver(ks8995_driver);
+
+MODULE_DESCRIPTION(DRV_DESC);
+MODULE_VERSION(DRV_VERSION);
+MODULE_AUTHOR("Gabor Juhos <juhosg at openwrt.org>");
+MODULE_LICENSE("GPL v2");