[ar71xx] add SPI driver for the Vitesse VSC7385 switch

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@16324 3c298f89-4303-0410-b956-a3cf2f4a3e73

1 files changed, 604 insertions, 0 deletions

diff --git a/target/linux/ar71xx/files/drivers/spi/spi_vsc7385.c b/target/linux/ar71xx/files/drivers/spi/spi_vsc7385.c
new file mode 100644
index 000000000..c270b0f05
--- /dev/null
+++ b/target/linux/ar71xx/files/drivers/spi/spi_vsc7385.c
@@ -0,0 +1,604 @@
+/*
+ * SPI driver for the Vitesse VSC7385 ethernet switch
+ *
+ * Copyright (C) 2009 Gabor Juhos <juhosg@openwrt.org>
+ *
+ * Parts of this file are based on Atheros' 2.6.15 BSP
+ *
+ * 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.
+ */
+
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/delay.h>
+#include <linux/device.h>
+#include <linux/bitops.h>
+#include <linux/firmware.h>
+#include <linux/spi/spi.h>
+#include <linux/spi/vsc7385.h>
+
+#define DRV_NAME	"spi-vsc7385"
+#define DRV_DESC	"Vitesse VSC7385 Gbit ethernet switch driver"
+#define DRV_VERSION	"0.1.0"
+
+#define VSC73XX_BLOCK_MAC	0x1
+#define VSC73XX_BLOCK_2		0x2
+#define VSC73XX_BLOCK_MII	0x3
+#define VSC73XX_BLOCK_4		0x4
+#define VSC73XX_BLOCK_5		0x5
+#define VSC73XX_BLOCK_SYSTEM	0x7
+
+#define VSC73XX_SUBBLOCK_PORT_0		0
+#define VSC73XX_SUBBLOCK_PORT_1		1
+#define VSC73XX_SUBBLOCK_PORT_2		2
+#define VSC73XX_SUBBLOCK_PORT_3		3
+#define VSC73XX_SUBBLOCK_PORT_4		4
+#define VSC73XX_SUBBLOCK_PORT_MAC	6
+
+/* MAC Block registers */
+#define VSC73XX_MAC_CFG		0x0
+#define VSC73XX_ADVPORTM	0x19
+#define VSC73XX_RXOCT		0x50
+#define VSC73XX_TXOCT		0x51
+#define VSC73XX_C_RX0		0x52
+#define VSC73XX_C_RX1		0x53
+#define VSC73XX_C_RX2		0x54
+#define VSC73XX_C_TX0		0x55
+#define VSC73XX_C_TX1		0x56
+#define VSC73XX_C_TX2		0x57
+#define VSC73XX_C_CFG		0x58
+
+/* MAC_CFG register bits */
+#define VSC73XX_MAC_CFG_WEXC_DIS	(1 << 31)
+#define VSC73XX_MAC_CFG_PORT_RST	(1 << 29)
+#define VSC73XX_MAC_CFG_TX_EN		(1 << 28)
+#define VSC73XX_MAC_CFG_SEED_LOAD      	(1 << 27)
+#define VSC73XX_MAC_CFG_FDX	        (1 << 18)
+#define VSC73XX_MAC_CFG_GIGE		(1 << 17)
+#define VSC73XX_MAC_CFG_RX_EN		(1 << 16)
+#define VSC73XX_MAC_CFG_VLAN_DBLAWR	(1 << 15)
+#define VSC73XX_MAC_CFG_VLAN_AWR	(1 << 14)
+#define VSC73XX_MAC_CFG_100_BASE_T	(1 << 13)
+#define VSC73XX_MAC_CFG_TX_IPG(x)	((x & 0x1f) << 6)
+#define VSC73XX_MAC_CFG_MAC_RX_RST	(1 << 5)
+#define VSC73XX_MAC_CFG_MAC_TX_RST	(1 << 4)
+#define VSC73XX_MAC_CFG_CLK_SEL(x)	((x & 0x3) << 0)
+
+/* ADVPORTM register bits */
+#define VSC73XX_ADVPORTM_IFG_PPM	(1 << 7)
+#define VSC73XX_ADVPORTM_EXC_COL_CONT	(1 << 6)
+#define VSC73XX_ADVPORTM_EXT_PORT	(1 << 5)
+#define VSC73XX_ADVPORTM_INV_GTX	(1 << 4)
+#define VSC73XX_ADVPORTM_ENA_GTX	(1 << 3)
+#define VSC73XX_ADVPORTM_DDR_MODE	(1 << 2)
+#define VSC73XX_ADVPORTM_IO_LOOPBACK	(1 << 1)
+#define VSC73XX_ADVPORTM_HOST_LOOPBACK	(1 << 0)
+
+/* MII Block registers */
+#define VSC73XX_MII_STAT	0x0
+#define VSC73XX_MII_CMD		0x1
+#define VSC73XX_MII_DATA	0x2
+
+/* System Block registers */
+#define VSC73XX_ICPU_SIPAD		0x01
+#define VSC73XX_ICPU_CLOCK_DELAY	0x05
+#define VSC73XX_ICPU_CTRL		0x10
+#define VSC73XX_ICPU_ADDR		0x11
+#define VSC73XX_ICPU_SRAM		0x12
+#define VSC73XX_ICPU_MBOX_VAL		0x15
+#define VSC73XX_ICPU_MBOX_SET		0x16
+#define VSC73XX_ICPU_MBOX_CLR		0x17
+#define VSC73XX_ICPU_CHIPID		0x18
+#define VSC73XX_ICPU_GPIO		0x34
+
+#define VSC73XX_ICPU_CTRL_CLK_DIV	(1 << 8)
+#define VSC73XX_ICPU_CTRL_SRST_HOLD	(1 << 7)
+#define VSC73XX_ICPU_CTRL_BOOT_EN	(1 << 3)
+#define VSC73XX_ICPU_CTRL_EXT_ACC_EN	(1 << 2)
+#define VSC73XX_ICPU_CTRL_CLK_EN	(1 << 1)
+#define VSC73XX_ICPU_CTRL_SRST		(1 << 0)
+
+#define VSC73XX_CMD_MODE_READ		0
+#define VSC73XX_CMD_MODE_WRITE		1
+#define VSC73XX_CMD_MODE_SHIFT		4
+#define VSC73XX_CMD_BLOCK_SHIFT		5
+#define VSC73XX_CMD_BLOCK_MASK		0x7
+#define VSC73XX_CMD_SUBBLOCK_MASK	0xf
+
+#define VSC7385_CLOCK_DELAY		((3 << 4) | 3)
+#define VSC7385_CLOCK_DELAY_MASK	((3 << 4) | 3)
+
+#define VSC73XX_ICPU_CTRL_STOP	(VSC73XX_ICPU_CTRL_SRST_HOLD | \
+				 VSC73XX_ICPU_CTRL_BOOT_EN | \
+				 VSC73XX_ICPU_CTRL_EXT_ACC_EN)
+
+#define VSC73XX_ICPU_CTRL_START	(VSC73XX_ICPU_CTRL_CLK_DIV | \
+				 VSC73XX_ICPU_CTRL_BOOT_EN | \
+				 VSC73XX_ICPU_CTRL_CLK_EN | \
+				 VSC73XX_ICPU_CTRL_SRST)
+
+#define VSC7385_ADVPORTM_MASK	(VSC73XX_ADVPORTM_IFG_PPM | \
+				 VSC73XX_ADVPORTM_EXC_COL_CONT | \
+				 VSC73XX_ADVPORTM_EXT_PORT | \
+				 VSC73XX_ADVPORTM_INV_GTX | \
+				 VSC73XX_ADVPORTM_ENA_GTX | \
+				 VSC73XX_ADVPORTM_DDR_MODE | \
+				 VSC73XX_ADVPORTM_IO_LOOPBACK | \
+				 VSC73XX_ADVPORTM_HOST_LOOPBACK)
+
+#define VSC7385_ADVPORTM_INIT	(VSC73XX_ADVPORTM_EXT_PORT | \
+				 VSC73XX_ADVPORTM_ENA_GTX | \
+				 VSC73XX_ADVPORTM_DDR_MODE)
+
+#define VSC7385_MAC_CFG_RESET	(VSC73XX_MAC_CFG_PORT_RST | \
+				 VSC73XX_MAC_CFG_MAC_RX_RST | \
+				 VSC73XX_MAC_CFG_MAC_TX_RST)
+
+#define VSC7385_MAC_CFG_INIT	(VSC73XX_MAC_CFG_TX_EN | \
+				 VSC73XX_MAC_CFG_FDX | \
+				 VSC73XX_MAC_CFG_GIGE | \
+				 VSC73XX_MAC_CFG_RX_EN | \
+				 VSC73XX_MAC_CFG_TX_IPG(6) | \
+				 4)
+
+#define VSC73XX_RESET_DELAY	100
+
+struct vsc7385 {
+	struct spi_device		*spi;
+	struct mutex			lock;
+	struct vsc7385_platform_data	*pdata;
+};
+
+static int vsc7385_is_addr_valid(u8 block, u8 subblock)
+{
+	switch (block) {
+	case VSC73XX_BLOCK_MAC:
+		switch (subblock) {
+		case 0 ... 4:
+		case 6:
+			return 1;
+		}
+		break;
+
+	case VSC73XX_BLOCK_2:
+	case VSC73XX_BLOCK_SYSTEM:
+		switch (subblock) {
+		case 0:
+			return 1;
+		}
+		break;
+
+	case VSC73XX_BLOCK_MII:
+	case VSC73XX_BLOCK_4:
+	case VSC73XX_BLOCK_5:
+		switch (subblock) {
+		case 0 ... 1:
+			return 1;
+		}
+		break;
+	}
+
+	return 0;
+}
+
+static inline u8 vsc7385_make_addr(u8 mode, u8 block, u8 subblock)
+{
+	u8 ret;
+
+	ret = (block & VSC73XX_CMD_BLOCK_MASK) << VSC73XX_CMD_BLOCK_SHIFT;
+	ret |= (mode & 1) << VSC73XX_CMD_MODE_SHIFT;
+	ret |= subblock & VSC73XX_CMD_SUBBLOCK_MASK;
+
+	return ret;
+}
+
+static int vsc7385_read(struct vsc7385 *vsc, u8 block, u8 subblock, u8 reg,
+			u32 *value)
+{
+	u8 cmd[4];
+	u8 buf[4];
+	struct spi_transfer t[2];
+	struct spi_message m;
+	int err;
+
+	if (!vsc7385_is_addr_valid(block, subblock))
+		return -EINVAL;
+
+	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 = sizeof(buf);
+	spi_message_add_tail(&t[1], &m);
+
+	cmd[0] = vsc7385_make_addr(VSC73XX_CMD_MODE_READ, block, subblock);
+	cmd[1] = reg;
+	cmd[2] = 0;
+	cmd[3] = 0;
+
+	mutex_lock(&vsc->lock);
+	err = spi_sync(vsc->spi, &m);
+	mutex_unlock(&vsc->lock);
+
+	if (err)
+		return err;
+
+	*value = (((u32) buf[0]) << 24) | (((u32) buf[1]) << 16) |
+		 (((u32) buf[2]) << 8) | ((u32) buf[3]);
+
+	return 0;
+}
+
+
+static int vsc7385_write(struct vsc7385 *vsc, u8 block, u8 subblock, u8 reg,
+			 u32 value)
+{
+	u8 cmd[2];
+	u8 buf[4];
+	struct spi_transfer t[2];
+	struct spi_message m;
+	int err;
+
+	if (!vsc7385_is_addr_valid(block, subblock))
+		return -EINVAL;
+
+	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 = sizeof(buf);
+	spi_message_add_tail(&t[1], &m);
+
+	cmd[0] = vsc7385_make_addr(VSC73XX_CMD_MODE_WRITE, block, subblock);
+	cmd[1] = reg;
+
+	buf[0] = (value >> 24) & 0xff;
+	buf[1] = (value >> 16) & 0xff;
+	buf[2] = (value >> 8) & 0xff;
+	buf[3] = value & 0xff;
+
+	mutex_lock(&vsc->lock);
+	err = spi_sync(vsc->spi, &m);
+	mutex_unlock(&vsc->lock);
+
+	return err;
+}
+
+static inline int vsc7385_write_verify(struct vsc7385 *vsc, u8 block,
+				       u8 subblock, u8 reg, u32 value,
+				       u32 read_mask, u32 read_val)
+{
+	struct spi_device *spi = vsc->spi;
+	u32 t;
+	int err;
+
+	err = vsc7385_write(vsc, block, subblock, reg, value);
+	if (err)
+		return err;
+
+	err = vsc7385_read(vsc, block, subblock, reg, &t);
+	if (err)
+		return err;
+
+	if ((t & read_mask) != read_val) {
+		dev_err(&spi->dev, "register write error\n");
+		return -EIO;
+	}
+
+	return 0;
+}
+
+static inline int vsc7385_set_clock_delay(struct vsc7385 *vsc, u32 val)
+{
+	return vsc7385_write(vsc, VSC73XX_BLOCK_SYSTEM, 0,
+			     VSC73XX_ICPU_CLOCK_DELAY, val);
+}
+
+static inline int vsc7385_get_clock_delay(struct vsc7385 *vsc, u32 *val)
+{
+	return vsc7385_read(vsc, VSC73XX_BLOCK_SYSTEM, 0,
+			    VSC73XX_ICPU_CLOCK_DELAY, val);
+}
+
+static inline int vsc7385_icpu_stop(struct vsc7385 *vsc)
+{
+	return vsc7385_write(vsc, VSC73XX_BLOCK_SYSTEM, 0, VSC73XX_ICPU_CTRL,
+			     VSC73XX_ICPU_CTRL_STOP);
+}
+
+static inline int vsc7385_icpu_start(struct vsc7385 *vsc)
+{
+	return vsc7385_write(vsc, VSC73XX_BLOCK_SYSTEM, 0, VSC73XX_ICPU_CTRL,
+			     VSC73XX_ICPU_CTRL_START);
+}
+
+static inline int vsc7385_icpu_reset(struct vsc7385 *vsc)
+{
+	int rc;
+
+	rc = vsc7385_write(vsc, VSC73XX_BLOCK_SYSTEM, 0, VSC73XX_ICPU_ADDR,
+			   0x0000);
+	if (rc)
+		dev_err(&vsc->spi->dev,
+			"could not reset microcode, err=%d\n", rc);
+
+	return rc;
+}
+
+static int vsc7385_upload_ucode(struct vsc7385 *vsc)
+{
+	struct spi_device *spi = vsc->spi;
+	const struct firmware *firmware;
+	char *ucode_name;
+	unsigned char *dp;
+	unsigned int curVal;
+	int i;
+	int diffs;
+	int rc;
+
+	ucode_name = (vsc->pdata->ucode_name) ? vsc->pdata->ucode_name
+					      : "vsc7385_ucode.bin";
+	rc = request_firmware(&firmware, ucode_name, &spi->dev);
+	if (rc) {
+		dev_err(&spi->dev, "request_firmware failed, err=%d\n",
+			rc);
+		return rc;
+	}
+
+	rc = vsc7385_icpu_stop(vsc);
+	if (rc)
+		goto out;
+
+	rc = vsc7385_icpu_reset(vsc);
+	if (rc)
+		goto out;
+
+	dev_info(&spi->dev, "uploading microcode...\n");
+
+	dp = (unsigned char *) firmware->data;
+	for (i = 0; i < firmware->size; i++) {
+		rc = vsc7385_write(vsc, VSC73XX_BLOCK_SYSTEM, 0,
+				   VSC73XX_ICPU_SRAM, *dp++);
+		if (rc) {
+			dev_err(&spi->dev, "could not load microcode, err=%d\n",
+				rc);
+			goto out;
+		}
+	}
+
+	rc = vsc7385_icpu_reset(vsc);
+	if (rc)
+		goto out;
+
+	dev_info(&spi->dev, "verifying microcode...\n");
+
+	dp = (unsigned char *) firmware->data;
+	diffs = 0;
+	for (i = 0; i < firmware->size; i++) {
+		rc = vsc7385_read(vsc, VSC73XX_BLOCK_SYSTEM, 0,
+				  VSC73XX_ICPU_SRAM, &curVal);
+		if (rc) {
+			dev_err(&spi->dev, "could not read microcode %d\n",rc);
+			goto out;
+		}
+
+		if (curVal > 0xff) {
+			dev_err(&spi->dev, "bad val read: %04x : %02x  %02x\n",
+				i, *dp, curVal);
+			rc = -EIO;
+			goto out;
+		}
+
+		if ((curVal & 0xff) != *dp) {
+			diffs++;
+			dev_err(&spi->dev, "verify error: %04x : %02x  %02x\n",
+				i, *dp, curVal);
+
+			if (diffs > 4)
+				break;
+			}
+		dp++;
+	}
+
+	if (diffs) {
+		dev_err(&spi->dev, "microcode verification failed\n");
+		rc = -EIO;
+		goto out;
+	}
+
+	dev_info(&spi->dev, "microcode uploaded\n");
+
+	rc = vsc7385_icpu_start(vsc);
+
+ out:
+	release_firmware(firmware);
+	return rc;
+}
+
+static int vsc7385_setup(struct vsc7385 *vsc)
+{
+	int err;
+
+	err = vsc7385_write_verify(vsc, VSC73XX_BLOCK_SYSTEM, 0,
+				   VSC73XX_ICPU_CLOCK_DELAY,
+				   VSC7385_CLOCK_DELAY,
+				   VSC7385_CLOCK_DELAY_MASK,
+				   VSC7385_CLOCK_DELAY);
+	if (err)
+		goto err;
+
+	err = vsc7385_write_verify(vsc, VSC73XX_BLOCK_MAC,
+				   VSC73XX_SUBBLOCK_PORT_MAC, VSC73XX_ADVPORTM,
+				   VSC7385_ADVPORTM_INIT,
+				   VSC7385_ADVPORTM_MASK,
+				   VSC7385_ADVPORTM_INIT);
+	if (err)
+		goto err;
+
+	err = vsc7385_write(vsc, VSC73XX_BLOCK_MAC, VSC73XX_SUBBLOCK_PORT_MAC,
+			    VSC73XX_MAC_CFG, VSC7385_MAC_CFG_RESET);
+	if (err)
+		goto err;
+
+	err = vsc7385_write(vsc, VSC73XX_BLOCK_MAC, VSC73XX_SUBBLOCK_PORT_MAC,
+			    VSC73XX_MAC_CFG, VSC7385_MAC_CFG_INIT);
+	if (err)
+		goto err;
+
+	return 0;
+
+ err:
+	return err;
+}
+
+static int vsc7385_detect(struct vsc7385 *vsc)
+{
+	struct spi_device *spi = vsc->spi;
+	u32 t;
+	u32 id;
+	u32 rev;
+	int err;
+
+	err = vsc7385_read(vsc, VSC73XX_BLOCK_SYSTEM, 0,
+				VSC73XX_ICPU_MBOX_VAL, &t);
+	if (err) {
+		dev_err(&spi->dev, "unable to read mailbox, err=%d\n", err);
+		return err;
+	}
+
+	if (t == 0xffffffff) {
+		dev_dbg(&spi->dev, "assert chip reset\n");
+		if (vsc->pdata->reset)
+			vsc->pdata->reset();
+
+	}
+
+	err = vsc7385_read(vsc, VSC73XX_BLOCK_SYSTEM, 0,
+				VSC73XX_ICPU_CHIPID, &t);
+	if (err) {
+		dev_err(&spi->dev, "unable to read chip id, err=%d\n", err);
+		return err;
+	}
+
+	id = (t >> 12) & 0xffff;
+	switch (id) {
+	case 0x7385:
+		break;
+	default:
+		dev_err(&spi->dev, "unsupported chip, id=%04x\n", id);
+		return -ENODEV;
+	}
+
+	rev = (t >> 28) & 0xf;
+	dev_info(&spi->dev, "VSC%04X (rev. %d) switch found \n", id, rev);
+
+	return 0;
+}
+
+static int __devinit vsc7385_probe(struct spi_device *spi)
+{
+	struct vsc7385 *vsc;
+	struct vsc7385_platform_data *pdata;
+	int	err;
+
+	printk(KERN_INFO DRV_DESC " version " DRV_VERSION"\n");
+
+	pdata = spi->dev.platform_data;
+	if (!pdata) {
+		dev_err(&spi->dev, "no platform data specified\n");
+		return-ENODEV;
+	}
+
+	vsc = kzalloc(sizeof(*vsc), GFP_KERNEL);
+	if (!vsc) {
+		dev_err(&spi->dev, "no memory for private data\n");
+		return-ENOMEM;
+	}
+
+	mutex_init(&vsc->lock);
+	vsc->pdata = pdata;
+	vsc->spi = spi_dev_get(spi);
+	dev_set_drvdata(&spi->dev, vsc);
+
+	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);
+		goto err_drvdata;
+	}
+
+	err = vsc7385_detect(vsc);
+	if (err) {
+		dev_err(&spi->dev, "no chip found, err=%d \n", err);
+		goto err_drvdata;
+	}
+
+	err = vsc7385_upload_ucode(vsc);
+	if (err)
+		goto err_drvdata;
+
+	err = vsc7385_setup(vsc);
+	if (err)
+		goto err_drvdata;
+
+	return 0;
+
+ err_drvdata:
+	dev_set_drvdata(&spi->dev, NULL);
+	kfree(vsc);
+	return err;
+}
+
+static int __devexit vsc7385_remove(struct spi_device *spi)
+{
+	struct vsc7385_data	*vsc;
+
+	vsc = dev_get_drvdata(&spi->dev);
+	dev_set_drvdata(&spi->dev, NULL);
+	kfree(vsc);
+
+	return 0;
+}
+
+static struct spi_driver vsc7385_driver = {
+	.driver = {
+		.name		= DRV_NAME,
+		.bus		= &spi_bus_type,
+		.owner		= THIS_MODULE,
+	},
+	.probe		= vsc7385_probe,
+	.remove		= __devexit_p(vsc7385_remove),
+};
+
+static int __init vsc7385_init(void)
+{
+	return spi_register_driver(&vsc7385_driver);
+}
+module_init(vsc7385_init);
+
+static void __exit vsc7385_exit(void)
+{
+	spi_unregister_driver(&vsc7385_driver);
+}
+module_exit(vsc7385_exit);
+
+MODULE_DESCRIPTION(DRV_DESC);
+MODULE_VERSION(DRV_VERSION);
+MODULE_AUTHOR("Gabor Juhos <juhosg@openwrt.org>");
+MODULE_LICENSE("GPL v2");
+