This driver supports the A5PSW switch, which is embedded in Renesas
RZ/N1 SoC.
+config NET_DSA_KS8995
+ tristate "Micrel KS8995 family 5-ports 10/100 Ethernet switches"
+ depends on SPI
+ help
+ This driver supports the Micrel KS8995 family of 10/100 Mbit ethernet
+ switches, managed over SPI.
+
config NET_DSA_SMSC_LAN9303
tristate
select NET_DSA_TAG_LAN9303
ifdef CONFIG_NET_DSA_LOOP
obj-$(CONFIG_FIXED_PHY) += dsa_loop_bdinfo.o
endif
+obj-$(CONFIG_NET_DSA_KS8995) += ks8995.o
obj-$(CONFIG_NET_DSA_LANTIQ_GSWIP) += lantiq_gswip.o
obj-$(CONFIG_NET_DSA_MT7530) += mt7530.o
obj-$(CONFIG_NET_DSA_MT7530_MDIO) += mt7530-mdio.o
--- /dev/null
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * 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
+ */
+
+#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/gpio/consumer.h>
+#include <linux/of.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 KSZ8795_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 FAMILY_KSZ8795 0x87
+#define CHIPID_M 0
+#define KS8995_CHIP_ID 0x00
+#define KSZ8864_CHIP_ID 0x01
+#define KSZ8795_CHIP_ID 0x09
+
+#define KS8995_CMD_WRITE 0x02U
+#define KS8995_CMD_READ 0x03U
+
+#define KS8995_RESET_DELAY 10 /* usec */
+
+enum ks8995_chip_variant {
+ ks8995,
+ ksz8864,
+ ksz8795,
+ max_variant
+};
+
+struct ks8995_chip_params {
+ char *name;
+ int family_id;
+ int chip_id;
+ int regs_size;
+ int addr_width;
+ int addr_shift;
+};
+
+static const struct ks8995_chip_params ks8995_chip[] = {
+ [ks8995] = {
+ .name = "KS8995MA",
+ .family_id = FAMILY_KS8995,
+ .chip_id = KS8995_CHIP_ID,
+ .regs_size = KS8995_REGS_SIZE,
+ .addr_width = 8,
+ .addr_shift = 0,
+ },
+ [ksz8864] = {
+ .name = "KSZ8864RMN",
+ .family_id = FAMILY_KS8995,
+ .chip_id = KSZ8864_CHIP_ID,
+ .regs_size = KSZ8864_REGS_SIZE,
+ .addr_width = 8,
+ .addr_shift = 0,
+ },
+ [ksz8795] = {
+ .name = "KSZ8795CLX",
+ .family_id = FAMILY_KSZ8795,
+ .chip_id = KSZ8795_CHIP_ID,
+ .regs_size = KSZ8795_REGS_SIZE,
+ .addr_width = 12,
+ .addr_shift = 1,
+ },
+};
+
+struct ks8995_switch {
+ struct spi_device *spi;
+ struct mutex lock;
+ struct gpio_desc *reset_gpio;
+ struct bin_attribute regs_attr;
+ const struct ks8995_chip_params *chip;
+ int revision_id;
+};
+
+static const struct spi_device_id ks8995_id[] = {
+ {"ks8995", ks8995},
+ {"ksz8864", ksz8864},
+ {"ksz8795", ksz8795},
+ { }
+};
+MODULE_DEVICE_TABLE(spi, ks8995_id);
+
+static const struct of_device_id ks8895_spi_of_match[] = {
+ { .compatible = "micrel,ks8995" },
+ { .compatible = "micrel,ksz8864" },
+ { .compatible = "micrel,ksz8795" },
+ { },
+};
+MODULE_DEVICE_TABLE(of, ks8895_spi_of_match);
+
+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;
+}
+
+/* create_spi_cmd - create a chip specific SPI command header
+ * @ks: pointer to switch instance
+ * @cmd: SPI command for switch
+ * @address: register address for command
+ *
+ * Different chip families use different bit pattern to address the switches
+ * registers:
+ *
+ * KS8995: 8bit command + 8bit address
+ * KSZ8795: 3bit command + 12bit address + 1bit TR (?)
+ */
+static inline __be16 create_spi_cmd(struct ks8995_switch *ks, int cmd,
+ unsigned address)
+{
+ u16 result = cmd;
+
+ /* make room for address (incl. address shift) */
+ result <<= ks->chip->addr_width + ks->chip->addr_shift;
+ /* add address */
+ result |= address << ks->chip->addr_shift;
+ /* SPI protocol needs big endian */
+ return cpu_to_be16(result);
+}
+/* ------------------------------------------------------------------------ */
+static int ks8995_read(struct ks8995_switch *ks, char *buf,
+ unsigned offset, size_t count)
+{
+ __be16 cmd;
+ struct spi_transfer t[2];
+ struct spi_message m;
+ int err;
+
+ cmd = create_spi_cmd(ks, KS8995_CMD_READ, offset);
+ 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);
+
+ 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)
+{
+ __be16 cmd;
+ struct spi_transfer t[2];
+ struct spi_message m;
+ int err;
+
+ cmd = create_spi_cmd(ks, KS8995_CMD_WRITE, offset);
+ 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);
+
+ 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,
+ const struct bin_attribute *bin_attr, char *buf, loff_t off, size_t count)
+{
+ struct device *dev;
+ struct ks8995_switch *ks8995;
+
+ dev = kobj_to_dev(kobj);
+ ks8995 = dev_get_drvdata(dev);
+
+ return ks8995_read(ks8995, buf, off, count);
+}
+
+static ssize_t ks8995_registers_write(struct file *filp, struct kobject *kobj,
+ const struct bin_attribute *bin_attr, char *buf, loff_t off, size_t count)
+{
+ struct device *dev;
+ struct ks8995_switch *ks8995;
+
+ dev = kobj_to_dev(kobj);
+ ks8995 = dev_get_drvdata(dev);
+
+ return ks8995_write(ks8995, buf, off, count);
+}
+
+/* ks8995_get_revision - get chip revision
+ * @ks: pointer to switch instance
+ *
+ * Verify chip family and id and get chip revision.
+ */
+static int ks8995_get_revision(struct ks8995_switch *ks)
+{
+ int err;
+ u8 id0, id1, ksz8864_id;
+
+ /* read family id */
+ err = ks8995_read_reg(ks, KS8995_REG_ID0, &id0);
+ if (err) {
+ err = -EIO;
+ goto err_out;
+ }
+
+ /* verify family id */
+ if (id0 != ks->chip->family_id) {
+ dev_err(&ks->spi->dev, "chip family id mismatch: expected 0x%02x but 0x%02x read\n",
+ ks->chip->family_id, id0);
+ err = -ENODEV;
+ goto err_out;
+ }
+
+ switch (ks->chip->family_id) {
+ case FAMILY_KS8995:
+ /* try reading chip id at CHIP ID1 */
+ err = ks8995_read_reg(ks, KS8995_REG_ID1, &id1);
+ if (err) {
+ err = -EIO;
+ goto err_out;
+ }
+
+ /* verify chip id */
+ if ((get_chip_id(id1) == CHIPID_M) &&
+ (get_chip_id(id1) == ks->chip->chip_id)) {
+ /* KS8995MA */
+ ks->revision_id = get_chip_rev(id1);
+ } else if (get_chip_id(id1) != CHIPID_M) {
+ /* KSZ8864RMN */
+ err = ks8995_read_reg(ks, KS8995_REG_ID1, &ksz8864_id);
+ if (err) {
+ err = -EIO;
+ goto err_out;
+ }
+
+ if ((ksz8864_id & 0x80) &&
+ (ks->chip->chip_id == KSZ8864_CHIP_ID)) {
+ ks->revision_id = get_chip_rev(id1);
+ }
+
+ } else {
+ dev_err(&ks->spi->dev, "unsupported chip id for KS8995 family: 0x%02x\n",
+ id1);
+ err = -ENODEV;
+ }
+ break;
+ case FAMILY_KSZ8795:
+ /* try reading chip id at CHIP ID1 */
+ err = ks8995_read_reg(ks, KS8995_REG_ID1, &id1);
+ if (err) {
+ err = -EIO;
+ goto err_out;
+ }
+
+ if (get_chip_id(id1) == ks->chip->chip_id) {
+ ks->revision_id = get_chip_rev(id1);
+ } else {
+ dev_err(&ks->spi->dev, "unsupported chip id for KSZ8795 family: 0x%02x\n",
+ id1);
+ err = -ENODEV;
+ }
+ break;
+ default:
+ dev_err(&ks->spi->dev, "unsupported family id: 0x%02x\n", id0);
+ err = -ENODEV;
+ break;
+ }
+err_out:
+ return err;
+}
+
+static const struct bin_attribute ks8995_registers_attr = {
+ .attr = {
+ .name = "registers",
+ .mode = 0600,
+ },
+ .size = KS8995_REGS_SIZE,
+ .read = ks8995_registers_read,
+ .write = ks8995_registers_write,
+};
+
+/* ------------------------------------------------------------------------ */
+static int ks8995_probe(struct spi_device *spi)
+{
+ struct ks8995_switch *ks;
+ int err;
+ int variant = spi_get_device_id(spi)->driver_data;
+
+ if (variant >= max_variant) {
+ dev_err(&spi->dev, "bad chip variant %d\n", variant);
+ return -ENODEV;
+ }
+
+ ks = devm_kzalloc(&spi->dev, sizeof(*ks), GFP_KERNEL);
+ if (!ks)
+ return -ENOMEM;
+
+ mutex_init(&ks->lock);
+ ks->spi = spi;
+ ks->chip = &ks8995_chip[variant];
+
+ ks->reset_gpio = devm_gpiod_get_optional(&spi->dev, "reset",
+ GPIOD_OUT_HIGH);
+ err = PTR_ERR_OR_ZERO(ks->reset_gpio);
+ if (err) {
+ dev_err(&spi->dev,
+ "failed to get reset gpio: %d\n", err);
+ return err;
+ }
+
+ err = gpiod_set_consumer_name(ks->reset_gpio, "switch-reset");
+ if (err)
+ return err;
+
+ /* de-assert switch reset */
+ /* FIXME: this likely requires a delay */
+ gpiod_set_value_cansleep(ks->reset_gpio, 0);
+
+ 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_get_revision(ks);
+ if (err)
+ return err;
+
+ memcpy(&ks->regs_attr, &ks8995_registers_attr, sizeof(ks->regs_attr));
+ ks->regs_attr.size = ks->chip->regs_size;
+
+ err = ks8995_reset(ks);
+ if (err)
+ return err;
+
+ sysfs_attr_init(&ks->regs_attr.attr);
+ 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;
+ }
+
+ dev_info(&spi->dev, "%s device found, Chip ID:%x, Revision:%x\n",
+ ks->chip->name, ks->chip->chip_id, ks->revision_id);
+
+ return 0;
+}
+
+static void ks8995_remove(struct spi_device *spi)
+{
+ struct ks8995_switch *ks = spi_get_drvdata(spi);
+
+ sysfs_remove_bin_file(&spi->dev.kobj, &ks->regs_attr);
+
+ /* assert reset */
+ gpiod_set_value_cansleep(ks->reset_gpio, 1);
+}
+
+/* ------------------------------------------------------------------------ */
+static struct spi_driver ks8995_driver = {
+ .driver = {
+ .name = "spi-ks8995",
+ .of_match_table = ks8895_spi_of_match,
+ },
+ .probe = ks8995_probe,
+ .remove = ks8995_remove,
+ .id_table = ks8995_id,
+};
+
+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");
Ethernet physical media devices and the Gigabit Ethernet controller.
endif # PHYLIB
-
-config MICREL_KS8995MA
- tristate "Micrel KS8995MA 5-ports 10/100 managed Ethernet switch"
- depends on SPI
obj-$(CONFIG_MAXLINEAR_86110_PHY) += mxl-86110.o
obj-y += mediatek/
obj-$(CONFIG_MESON_GXL_PHY) += meson-gxl.o
-obj-$(CONFIG_MICREL_KS8995MA) += spi_ks8995.o
obj-$(CONFIG_MICREL_PHY) += micrel.o
obj-$(CONFIG_MICROCHIP_PHY) += microchip.o
obj-$(CONFIG_MICROCHIP_PHY_RDS_PTP) += microchip_rds_ptp.o
+++ /dev/null
-// SPDX-License-Identifier: GPL-2.0
-/*
- * 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
- */
-
-#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/gpio/consumer.h>
-#include <linux/of.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 KSZ8795_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 FAMILY_KSZ8795 0x87
-#define CHIPID_M 0
-#define KS8995_CHIP_ID 0x00
-#define KSZ8864_CHIP_ID 0x01
-#define KSZ8795_CHIP_ID 0x09
-
-#define KS8995_CMD_WRITE 0x02U
-#define KS8995_CMD_READ 0x03U
-
-#define KS8995_RESET_DELAY 10 /* usec */
-
-enum ks8995_chip_variant {
- ks8995,
- ksz8864,
- ksz8795,
- max_variant
-};
-
-struct ks8995_chip_params {
- char *name;
- int family_id;
- int chip_id;
- int regs_size;
- int addr_width;
- int addr_shift;
-};
-
-static const struct ks8995_chip_params ks8995_chip[] = {
- [ks8995] = {
- .name = "KS8995MA",
- .family_id = FAMILY_KS8995,
- .chip_id = KS8995_CHIP_ID,
- .regs_size = KS8995_REGS_SIZE,
- .addr_width = 8,
- .addr_shift = 0,
- },
- [ksz8864] = {
- .name = "KSZ8864RMN",
- .family_id = FAMILY_KS8995,
- .chip_id = KSZ8864_CHIP_ID,
- .regs_size = KSZ8864_REGS_SIZE,
- .addr_width = 8,
- .addr_shift = 0,
- },
- [ksz8795] = {
- .name = "KSZ8795CLX",
- .family_id = FAMILY_KSZ8795,
- .chip_id = KSZ8795_CHIP_ID,
- .regs_size = KSZ8795_REGS_SIZE,
- .addr_width = 12,
- .addr_shift = 1,
- },
-};
-
-struct ks8995_switch {
- struct spi_device *spi;
- struct mutex lock;
- struct gpio_desc *reset_gpio;
- struct bin_attribute regs_attr;
- const struct ks8995_chip_params *chip;
- int revision_id;
-};
-
-static const struct spi_device_id ks8995_id[] = {
- {"ks8995", ks8995},
- {"ksz8864", ksz8864},
- {"ksz8795", ksz8795},
- { }
-};
-MODULE_DEVICE_TABLE(spi, ks8995_id);
-
-static const struct of_device_id ks8895_spi_of_match[] = {
- { .compatible = "micrel,ks8995" },
- { .compatible = "micrel,ksz8864" },
- { .compatible = "micrel,ksz8795" },
- { },
-};
-MODULE_DEVICE_TABLE(of, ks8895_spi_of_match);
-
-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;
-}
-
-/* create_spi_cmd - create a chip specific SPI command header
- * @ks: pointer to switch instance
- * @cmd: SPI command for switch
- * @address: register address for command
- *
- * Different chip families use different bit pattern to address the switches
- * registers:
- *
- * KS8995: 8bit command + 8bit address
- * KSZ8795: 3bit command + 12bit address + 1bit TR (?)
- */
-static inline __be16 create_spi_cmd(struct ks8995_switch *ks, int cmd,
- unsigned address)
-{
- u16 result = cmd;
-
- /* make room for address (incl. address shift) */
- result <<= ks->chip->addr_width + ks->chip->addr_shift;
- /* add address */
- result |= address << ks->chip->addr_shift;
- /* SPI protocol needs big endian */
- return cpu_to_be16(result);
-}
-/* ------------------------------------------------------------------------ */
-static int ks8995_read(struct ks8995_switch *ks, char *buf,
- unsigned offset, size_t count)
-{
- __be16 cmd;
- struct spi_transfer t[2];
- struct spi_message m;
- int err;
-
- cmd = create_spi_cmd(ks, KS8995_CMD_READ, offset);
- 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);
-
- 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)
-{
- __be16 cmd;
- struct spi_transfer t[2];
- struct spi_message m;
- int err;
-
- cmd = create_spi_cmd(ks, KS8995_CMD_WRITE, offset);
- 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);
-
- 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,
- const struct bin_attribute *bin_attr, char *buf, loff_t off, size_t count)
-{
- struct device *dev;
- struct ks8995_switch *ks8995;
-
- dev = kobj_to_dev(kobj);
- ks8995 = dev_get_drvdata(dev);
-
- return ks8995_read(ks8995, buf, off, count);
-}
-
-static ssize_t ks8995_registers_write(struct file *filp, struct kobject *kobj,
- const struct bin_attribute *bin_attr, char *buf, loff_t off, size_t count)
-{
- struct device *dev;
- struct ks8995_switch *ks8995;
-
- dev = kobj_to_dev(kobj);
- ks8995 = dev_get_drvdata(dev);
-
- return ks8995_write(ks8995, buf, off, count);
-}
-
-/* ks8995_get_revision - get chip revision
- * @ks: pointer to switch instance
- *
- * Verify chip family and id and get chip revision.
- */
-static int ks8995_get_revision(struct ks8995_switch *ks)
-{
- int err;
- u8 id0, id1, ksz8864_id;
-
- /* read family id */
- err = ks8995_read_reg(ks, KS8995_REG_ID0, &id0);
- if (err) {
- err = -EIO;
- goto err_out;
- }
-
- /* verify family id */
- if (id0 != ks->chip->family_id) {
- dev_err(&ks->spi->dev, "chip family id mismatch: expected 0x%02x but 0x%02x read\n",
- ks->chip->family_id, id0);
- err = -ENODEV;
- goto err_out;
- }
-
- switch (ks->chip->family_id) {
- case FAMILY_KS8995:
- /* try reading chip id at CHIP ID1 */
- err = ks8995_read_reg(ks, KS8995_REG_ID1, &id1);
- if (err) {
- err = -EIO;
- goto err_out;
- }
-
- /* verify chip id */
- if ((get_chip_id(id1) == CHIPID_M) &&
- (get_chip_id(id1) == ks->chip->chip_id)) {
- /* KS8995MA */
- ks->revision_id = get_chip_rev(id1);
- } else if (get_chip_id(id1) != CHIPID_M) {
- /* KSZ8864RMN */
- err = ks8995_read_reg(ks, KS8995_REG_ID1, &ksz8864_id);
- if (err) {
- err = -EIO;
- goto err_out;
- }
-
- if ((ksz8864_id & 0x80) &&
- (ks->chip->chip_id == KSZ8864_CHIP_ID)) {
- ks->revision_id = get_chip_rev(id1);
- }
-
- } else {
- dev_err(&ks->spi->dev, "unsupported chip id for KS8995 family: 0x%02x\n",
- id1);
- err = -ENODEV;
- }
- break;
- case FAMILY_KSZ8795:
- /* try reading chip id at CHIP ID1 */
- err = ks8995_read_reg(ks, KS8995_REG_ID1, &id1);
- if (err) {
- err = -EIO;
- goto err_out;
- }
-
- if (get_chip_id(id1) == ks->chip->chip_id) {
- ks->revision_id = get_chip_rev(id1);
- } else {
- dev_err(&ks->spi->dev, "unsupported chip id for KSZ8795 family: 0x%02x\n",
- id1);
- err = -ENODEV;
- }
- break;
- default:
- dev_err(&ks->spi->dev, "unsupported family id: 0x%02x\n", id0);
- err = -ENODEV;
- break;
- }
-err_out:
- return err;
-}
-
-static const struct bin_attribute ks8995_registers_attr = {
- .attr = {
- .name = "registers",
- .mode = 0600,
- },
- .size = KS8995_REGS_SIZE,
- .read = ks8995_registers_read,
- .write = ks8995_registers_write,
-};
-
-/* ------------------------------------------------------------------------ */
-static int ks8995_probe(struct spi_device *spi)
-{
- struct ks8995_switch *ks;
- int err;
- int variant = spi_get_device_id(spi)->driver_data;
-
- if (variant >= max_variant) {
- dev_err(&spi->dev, "bad chip variant %d\n", variant);
- return -ENODEV;
- }
-
- ks = devm_kzalloc(&spi->dev, sizeof(*ks), GFP_KERNEL);
- if (!ks)
- return -ENOMEM;
-
- mutex_init(&ks->lock);
- ks->spi = spi;
- ks->chip = &ks8995_chip[variant];
-
- ks->reset_gpio = devm_gpiod_get_optional(&spi->dev, "reset",
- GPIOD_OUT_HIGH);
- err = PTR_ERR_OR_ZERO(ks->reset_gpio);
- if (err) {
- dev_err(&spi->dev,
- "failed to get reset gpio: %d\n", err);
- return err;
- }
-
- err = gpiod_set_consumer_name(ks->reset_gpio, "switch-reset");
- if (err)
- return err;
-
- /* de-assert switch reset */
- /* FIXME: this likely requires a delay */
- gpiod_set_value_cansleep(ks->reset_gpio, 0);
-
- 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_get_revision(ks);
- if (err)
- return err;
-
- memcpy(&ks->regs_attr, &ks8995_registers_attr, sizeof(ks->regs_attr));
- ks->regs_attr.size = ks->chip->regs_size;
-
- err = ks8995_reset(ks);
- if (err)
- return err;
-
- sysfs_attr_init(&ks->regs_attr.attr);
- 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;
- }
-
- dev_info(&spi->dev, "%s device found, Chip ID:%x, Revision:%x\n",
- ks->chip->name, ks->chip->chip_id, ks->revision_id);
-
- return 0;
-}
-
-static void ks8995_remove(struct spi_device *spi)
-{
- struct ks8995_switch *ks = spi_get_drvdata(spi);
-
- sysfs_remove_bin_file(&spi->dev.kobj, &ks->regs_attr);
-
- /* assert reset */
- gpiod_set_value_cansleep(ks->reset_gpio, 1);
-}
-
-/* ------------------------------------------------------------------------ */
-static struct spi_driver ks8995_driver = {
- .driver = {
- .name = "spi-ks8995",
- .of_match_table = ks8895_spi_of_match,
- },
- .probe = ks8995_probe,
- .remove = ks8995_remove,
- .id_table = ks8995_id,
-};
-
-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");
projects / linux-2.6-microblaze.git / commitdiff