- 根目录:
- drivers
- mmc
- host
- ushc.c
/*
* USB SD Host Controller (USHC) controller driver.
*
* Copyright (C) 2010 Cambridge Silicon Radio Ltd.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or (at
* your option) any later version.
*
* Notes:
* - Only version 2 devices are supported.
* - Version 2 devices only support SDIO cards/devices (R2 response is
* unsupported).
*
* References:
* [USHC] USB SD Host Controller specification (CS-118793-SP)
*/
#include <linux/module.h>
#include <linux/usb.h>
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/dma-mapping.h>
#include <linux/mmc/host.h>
enum ushc_request {
USHC_GET_CAPS = 0x00,
USHC_HOST_CTRL = 0x01,
USHC_PWR_CTRL = 0x02,
USHC_CLK_FREQ = 0x03,
USHC_EXEC_CMD = 0x04,
USHC_READ_RESP = 0x05,
USHC_RESET = 0x06,
};
enum ushc_request_type {
USHC_GET_CAPS_TYPE = USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
USHC_HOST_CTRL_TYPE = USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
USHC_PWR_CTRL_TYPE = USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
USHC_CLK_FREQ_TYPE = USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
USHC_EXEC_CMD_TYPE = USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
USHC_READ_RESP_TYPE = USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
USHC_RESET_TYPE = USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
};
#define USHC_GET_CAPS_VERSION_MASK 0xff
#define USHC_GET_CAPS_3V3 (1 << 8)
#define USHC_GET_CAPS_3V0 (1 << 9)
#define USHC_GET_CAPS_1V8 (1 << 10)
#define USHC_GET_CAPS_HIGH_SPD (1 << 16)
#define USHC_HOST_CTRL_4BIT (1 << 1)
#define USHC_HOST_CTRL_HIGH_SPD (1 << 0)
#define USHC_PWR_CTRL_OFF 0x00
#define USHC_PWR_CTRL_3V3 0x01
#define USHC_PWR_CTRL_3V0 0x02
#define USHC_PWR_CTRL_1V8 0x03
#define USHC_READ_RESP_BUSY (1 << 4)
#define USHC_READ_RESP_ERR_TIMEOUT (1 << 3)
#define USHC_READ_RESP_ERR_CRC (1 << 2)
#define USHC_READ_RESP_ERR_DAT (1 << 1)
#define USHC_READ_RESP_ERR_CMD (1 << 0)
#define USHC_READ_RESP_ERR_MASK 0x0f
struct ushc_cbw {
__u8 signature;
__u8 cmd_idx;
__le16 block_size;
__le32 arg;
} __attribute__((packed));
#define USHC_CBW_SIGNATURE 'C'
struct ushc_csw {
__u8 signature;
__u8 status;
__le32 response;
} __attribute__((packed));
#define USHC_CSW_SIGNATURE 'S'
struct ushc_int_data {
u8 status;
u8 reserved[3];
};
#define USHC_INT_STATUS_SDIO_INT (1 << 1)
#define USHC_INT_STATUS_CARD_PRESENT (1 << 0)
struct ushc_data {
struct usb_device *usb_dev;
struct mmc_host *mmc;
struct urb *int_urb;
struct ushc_int_data *int_data;
struct urb *cbw_urb;
struct ushc_cbw *cbw;
struct urb *data_urb;
struct urb *csw_urb;
struct ushc_csw *csw;
spinlock_t lock;
struct mmc_request *current_req;
u32 caps;
u16 host_ctrl;
unsigned long flags;
u8 last_status;
int clock_freq;
};
#define DISCONNECTED 0
#define INT_EN 1
#define IGNORE_NEXT_INT 2
static void data_callback(struct urb *urb);
static int ushc_hw_reset(struct ushc_data *ushc)
{
return usb_control_msg(ushc->usb_dev, usb_sndctrlpipe(ushc->usb_dev, 0),
USHC_RESET, USHC_RESET_TYPE,
0, 0, NULL, 0, 100);
}
static int ushc_hw_get_caps(struct ushc_data *ushc)
{
int ret;
int version;
ret = usb_control_msg(ushc->usb_dev, usb_rcvctrlpipe(ushc->usb_dev, 0),
USHC_GET_CAPS, USHC_GET_CAPS_TYPE,
0, 0, &ushc->caps, sizeof(ushc->caps), 100);
if (ret < 0)
return ret;
ushc->caps = le32_to_cpu(ushc->caps);
version = ushc->caps & USHC_GET_CAPS_VERSION_MASK;
if (version != 0x02) {
dev_err(&ushc->usb_dev->dev, "controller version %d is not supported\n", version);
return -EINVAL;
}
return 0;
}
static int ushc_hw_set_host_ctrl(struct ushc_data *ushc, u16 mask, u16 val)
{
u16 host_ctrl;
int ret;
host_ctrl = (ushc->host_ctrl & ~mask) | val;
ret = usb_control_msg(ushc->usb_dev, usb_sndctrlpipe(ushc->usb_dev, 0),
USHC_HOST_CTRL, USHC_HOST_CTRL_TYPE,
host_ctrl, 0, NULL, 0, 100);
if (ret < 0)
return ret;
ushc->host_ctrl = host_ctrl;
return 0;
}
static void int_callback(struct urb *urb)
{
struct ushc_data *ushc = urb->context;
u8 status, last_status;
if (urb->status < 0)
return;
status = ushc->int_data->status;
last_status = ushc->last_status;
ushc->last_status = status;
/*
* Ignore the card interrupt status on interrupt transfers that
* were submitted while card interrupts where disabled.
*
* This avoid occasional spurious interrupts when enabling
* interrupts immediately after clearing the source on the card.
*/
if (!test_and_clear_bit(IGNORE_NEXT_INT, &ushc->flags)
&& test_bit(INT_EN, &ushc->flags)
&& status & USHC_INT_STATUS_SDIO_INT) {
mmc_signal_sdio_irq(ushc->mmc);
}
if ((status ^ last_status) & USHC_INT_STATUS_CARD_PRESENT)
mmc_detect_change(ushc->mmc, msecs_to_jiffies(100));
if (!test_bit(INT_EN, &ushc->flags))
set_bit(IGNORE_NEXT_INT, &ushc->flags);
usb_submit_urb(ushc->int_urb, GFP_ATOMIC);
}
static void cbw_callback(struct urb *urb)
{
struct ushc_data *ushc = urb->context;
if (urb->status != 0) {
usb_unlink_urb(ushc->data_urb);
usb_unlink_urb(ushc->csw_urb);
}
}
static void data_callback(struct urb *urb)
{
struct ushc_data *ushc = urb->context;
if (urb->status != 0)
usb_unlink_urb(ushc->csw_urb);
}
static void csw_callback(struct urb *urb)
{
struct ushc_data *ushc = urb->context;
struct mmc_request *req = ushc->current_req;
int status;
status = ushc->csw->status;
if (urb->status != 0) {
req->cmd->error = urb->status;
} else if (status & USHC_READ_RESP_ERR_CMD) {
if (status & USHC_READ_RESP_ERR_CRC)
req->cmd->error = -EIO;
else
req->cmd->error = -ETIMEDOUT;
}
if (req->data) {
if (status & USHC_READ_RESP_ERR_DAT) {
if (status & USHC_READ_RESP_ERR_CRC)
req->data->error = -EIO;
else
req->data->error = -ETIMEDOUT;
req->data->bytes_xfered = 0;
} else {
req->data->bytes_xfered = req->data->blksz * req->data->blocks;
}
}
req->cmd->resp[0] = le32_to_cpu(ushc->csw->response);
mmc_request_done(ushc->mmc, req);
}
static void ushc_request(struct mmc_host *mmc, struct mmc_request *req)
{
struct ushc_data *ushc = mmc_priv(mmc);
int ret;
unsigned long flags;
spin_lock_irqsave(&ushc->lock, flags);
if (test_bit(DISCONNECTED, &ushc->flags)) {
ret = -ENODEV;
goto out;
}
/* Version 2 firmware doesn't support the R2 response format. */
if (req->cmd->flags & MMC_RSP_136) {
ret = -EINVAL;
goto out;
}
/* The Astoria's data FIFOs don't work with clock speeds < 5MHz so
limit commands with data to 6MHz or more. */
if (req->data && ushc->clock_freq < 6000000) {
ret = -EINVAL;
goto out;
}
ushc->current_req = req;
/* Start cmd with CBW. */
ushc->cbw->cmd_idx = cpu_to_le16(req->cmd->opcode);
if (req->data)
ushc->cbw->block_size = cpu_to_le16(req->data->blksz);
else
ushc->cbw->block_size = 0;
ushc->cbw->arg = cpu_to_le32(req->cmd->arg);
ret = usb_submit_urb(ushc->cbw_urb, GFP_ATOMIC);
if (ret < 0)
goto out;
/* Submit data (if any). */
if (req->data) {
struct mmc_data *data = req->data;
int pipe;
if (data->flags & MMC_DATA_READ)
pipe = usb_rcvbulkpipe(ushc->usb_dev, 6);
else
pipe = usb_sndbulkpipe(ushc->usb_dev, 2);
usb_fill_bulk_urb(ushc->data_urb, ushc->usb_dev, pipe,
sg_virt(data->sg), data->sg->length,
data_callback, ushc);
ret = usb_submit_urb(ushc->data_urb, GFP_ATOMIC);
if (ret < 0)
goto out;
}
/* Submit CSW. */
ret = usb_submit_urb(ushc->csw_urb, GFP_ATOMIC);
if (ret < 0)
goto out;
out:
spin_unlock_irqrestore(&ushc->lock, flags);
if (ret < 0) {
usb_unlink_urb(ushc->cbw_urb);
usb_unlink_urb(ushc->data_urb);
req->cmd->error = ret;
mmc_request_done(mmc, req);
}
}
static int ushc_set_power(struct ushc_data *ushc, unsigned char power_mode)
{
u16 voltage;
switch (power_mode) {
case MMC_POWER_OFF:
voltage = USHC_PWR_CTRL_OFF;
break;
case MMC_POWER_UP:
case MMC_POWER_ON:
voltage = USHC_PWR_CTRL_3V3;
break;
default:
return -EINVAL;
}
return usb_control_msg(ushc->usb_dev, usb_sndctrlpipe(ushc->usb_dev, 0),
USHC_PWR_CTRL, USHC_PWR_CTRL_TYPE,
voltage, 0, NULL, 0, 100);
}
static int ushc_set_bus_width(struct ushc_data *ushc, int bus_width)
{
return ushc_hw_set_host_ctrl(ushc, USHC_HOST_CTRL_4BIT,
bus_width == 4 ? USHC_HOST_CTRL_4BIT : 0);
}
static int ushc_set_bus_freq(struct ushc_data *ushc, int clk, bool enable_hs)
{
int ret;
/* Hardware can't detect interrupts while the clock is off. */
if (clk == 0)
clk = 400000;
ret = ushc_hw_set_host_ctrl(ushc, USHC_HOST_CTRL_HIGH_SPD,
enable_hs ? USHC_HOST_CTRL_HIGH_SPD : 0);
if (ret < 0)
return ret;
ret = usb_control_msg(ushc->usb_dev, usb_sndctrlpipe(ushc->usb_dev, 0),
USHC_CLK_FREQ, USHC_CLK_FREQ_TYPE,
clk & 0xffff, (clk >> 16) & 0xffff, NULL, 0, 100);
if (ret < 0)
return ret;
ushc->clock_freq = clk;
return 0;
}
static void ushc_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
{
struct ushc_data *ushc = mmc_priv(mmc);
ushc_set_power(ushc, ios->power_mode);
ushc_set_bus_width(ushc, 1 << ios->bus_width);
ushc_set_bus_freq(ushc, ios->clock, ios->timing == MMC_TIMING_SD_HS);
}
static int ushc_get_cd(struct mmc_host *mmc)
{
struct ushc_data *ushc = mmc_priv(mmc);
return !!(ushc->last_status & USHC_INT_STATUS_CARD_PRESENT);
}
static void ushc_enable_sdio_irq(struct mmc_host *mmc, int enable)
{
struct ushc_data *ushc = mmc_priv(mmc);
if (enable)
set_bit(INT_EN, &ushc->flags);
else
clear_bit(INT_EN, &ushc->flags);
}
static void ushc_clean_up(struct ushc_data *ushc)
{
usb_free_urb(ushc->int_urb);
usb_free_urb(ushc->csw_urb);
usb_free_urb(ushc->data_urb);
usb_free_urb(ushc->cbw_urb);
kfree(ushc->int_data);
kfree(ushc->cbw);
kfree(ushc->csw);
mmc_free_host(ushc->mmc);
}
static const struct mmc_host_ops ushc_ops = {
.request = ushc_request,
.set_ios = ushc_set_ios,
.get_cd = ushc_get_cd,
.enable_sdio_irq = ushc_enable_sdio_irq,
};
static int ushc_probe(struct usb_interface *intf, const struct usb_device_id *id)
{
struct usb_device *usb_dev = interface_to_usbdev(intf);
struct mmc_host *mmc;
struct ushc_data *ushc;
int ret;
mmc = mmc_alloc_host(sizeof(struct ushc_data), &intf->dev);
if (mmc == NULL)
return -ENOMEM;
ushc = mmc_priv(mmc);
usb_set_intfdata(intf, ushc);
ushc->usb_dev = usb_dev;
ushc->mmc = mmc;
spin_lock_init(&ushc->lock);
ret = ushc_hw_reset(ushc);
if (ret < 0)
goto err;
/* Read capabilities. */
ret = ushc_hw_get_caps(ushc);
if (ret < 0)
goto err;
mmc->ops = &ushc_ops;
mmc->f_min = 400000;
mmc->f_max = 50000000;
mmc->ocr_avail = MMC_VDD_32_33 | MMC_VDD_33_34;
mmc->caps = MMC_CAP_4_BIT_DATA | MMC_CAP_SDIO_IRQ;
mmc->caps |= (ushc->caps & USHC_GET_CAPS_HIGH_SPD) ? MMC_CAP_SD_HIGHSPEED : 0;
mmc->max_seg_size = 512*511;
mmc->max_segs = 1;
mmc->max_req_size = 512*511;
mmc->max_blk_size = 512;
mmc->max_blk_count = 511;
ushc->int_urb = usb_alloc_urb(0, GFP_KERNEL);
if (ushc->int_urb == NULL) {
ret = -ENOMEM;
goto err;
}
ushc->int_data = kzalloc(sizeof(struct ushc_int_data), GFP_KERNEL);
if (ushc->int_data == NULL) {
ret = -ENOMEM;
goto err;
}
usb_fill_int_urb(ushc->int_urb, ushc->usb_dev,
usb_rcvintpipe(usb_dev,
intf->cur_altsetting->endpoint[0].desc.bEndpointAddress),
ushc->int_data, sizeof(struct ushc_int_data),
int_callback, ushc,
intf->cur_altsetting->endpoint[0].desc.bInterval);
ushc->cbw_urb = usb_alloc_urb(0, GFP_KERNEL);
if (ushc->cbw_urb == NULL) {
ret = -ENOMEM;
goto err;
}
ushc->cbw = kzalloc(sizeof(struct ushc_cbw), GFP_KERNEL);
if (ushc->cbw == NULL) {
ret = -ENOMEM;
goto err;
}
ushc->cbw->signature = USHC_CBW_SIGNATURE;
usb_fill_bulk_urb(ushc->cbw_urb, ushc->usb_dev, usb_sndbulkpipe(usb_dev, 2),
ushc->cbw, sizeof(struct ushc_cbw),
cbw_callback, ushc);
ushc->data_urb = usb_alloc_urb(0, GFP_KERNEL);
if (ushc->data_urb == NULL) {
ret = -ENOMEM;
goto err;
}
ushc->csw_urb = usb_alloc_urb(0, GFP_KERNEL);
if (ushc->csw_urb == NULL) {
ret = -ENOMEM;
goto err;
}
ushc->csw = kzalloc(sizeof(struct ushc_csw), GFP_KERNEL);
if (ushc->csw == NULL) {
ret = -ENOMEM;
goto err;
}
usb_fill_bulk_urb(ushc->csw_urb, ushc->usb_dev, usb_rcvbulkpipe(usb_dev, 6),
ushc->csw, sizeof(struct ushc_csw),
csw_callback, ushc);
ret = mmc_add_host(ushc->mmc);
if (ret)
goto err;
ret = usb_submit_urb(ushc->int_urb, GFP_KERNEL);
if (ret < 0) {
mmc_remove_host(ushc->mmc);
goto err;
}
return 0;
err:
ushc_clean_up(ushc);
return ret;
}
static void ushc_disconnect(struct usb_interface *intf)
{
struct ushc_data *ushc = usb_get_intfdata(intf);
spin_lock_irq(&ushc->lock);
set_bit(DISCONNECTED, &ushc->flags);
spin_unlock_irq(&ushc->lock);
usb_kill_urb(ushc->int_urb);
usb_kill_urb(ushc->cbw_urb);
usb_kill_urb(ushc->data_urb);
usb_kill_urb(ushc->csw_urb);
mmc_remove_host(ushc->mmc);
ushc_clean_up(ushc);
}
static struct usb_device_id ushc_id_table[] = {
/* CSR USB SD Host Controller */
{ USB_DEVICE(0x0a12, 0x5d10) },
{ },
};
MODULE_DEVICE_TABLE(usb, ushc_id_table);
static struct usb_driver ushc_driver = {
.name = "ushc",
.id_table = ushc_id_table,
.probe = ushc_probe,
.disconnect = ushc_disconnect,
};
module_usb_driver(ushc_driver);
MODULE_DESCRIPTION("USB SD Host Controller driver");
MODULE_AUTHOR("David Vrabel <david.vrabel@csr.com>");
MODULE_LICENSE("GPL");