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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* USB SD Host Controller (USHC) controller driver.
*
* Copyright (C) 2010 Cambridge Silicon Radio Ltd.
*
* 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
|