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openwrt/target/linux/ar71xx/files/drivers/spi/spi_vsc7385.c

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/*
* 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_BIT2 (1 << 2)
#define VSC73XX_MAC_CFG_CLK_SEL(x) ((x) & 0x3)
/* 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_ICPU_CHIPID_ID_SHIFT 12
#define VSC73XX_ICPU_CHIPID_ID_MASK 0xffff
#define VSC73XX_ICPU_CHIPID_REV_SHIFT 28
#define VSC73XX_ICPU_CHIPID_REV_MASK 0xf
#define VSC73XX_ICPU_CHIPID_ID_7385 0x7385
#define VSC73XX_ICPU_CHIPID_ID_7395 0x7395
#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 VSC73XX_MAC_CFG_INIT (VSC73XX_MAC_CFG_TX_EN | \
VSC73XX_MAC_CFG_FDX | \
VSC73XX_MAC_CFG_GIGE | \
VSC73XX_MAC_CFG_RX_EN)
#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)
{
struct vsc7385_platform_data *pdata = vsc->pdata;
u32 t;
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;
t = VSC73XX_MAC_CFG_INIT;
t |= VSC73XX_MAC_CFG_TX_IPG(pdata->mac_cfg.tx_ipg);
t |= VSC73XX_MAC_CFG_CLK_SEL(pdata->mac_cfg.clk_sel);
if (pdata->mac_cfg.bit2)
t |= VSC73XX_MAC_CFG_BIT2;
err = vsc7385_write(vsc, VSC73XX_BLOCK_MAC, VSC73XX_SUBBLOCK_PORT_MAC,
VSC73XX_MAC_CFG, t);
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 >> VSC73XX_ICPU_CHIPID_ID_SHIFT) & VSC73XX_ICPU_CHIPID_ID_MASK;
switch (id) {
case VSC73XX_ICPU_CHIPID_ID_7385:
case VSC73XX_ICPU_CHIPID_ID_7395:
break;
default:
dev_err(&spi->dev, "unsupported chip, id=%04x\n", id);
return -ENODEV;
}
rev = (t >> VSC73XX_ICPU_CHIPID_REV_SHIFT) &
VSC73XX_ICPU_CHIPID_REV_MASK;
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");
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