// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* smssdio.c - Siano 1xxx SDIO interface driver
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*
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* Copyright 2008 Pierre Ossman
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*
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* Based on code by Siano Mobile Silicon, Inc.,
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* Copyright (C) 2006-2008, Uri Shkolnik
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*
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* This hardware is a bit odd in that all transfers should be done
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* to/from the SMSSDIO_DATA register, yet the "increase address" bit
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* always needs to be set.
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*
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* Also, buffers from the card are always aligned to 128 byte
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* boundaries.
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*/
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/*
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* General cleanup notes:
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*
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* - only typedefs should be name *_t
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*
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* - use ERR_PTR and friends for smscore_register_device()
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*
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* - smscore_getbuffer should zero fields
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*
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* Fix stop command
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*/
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#include "smscoreapi.h"
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#include <linux/moduleparam.h>
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#include <linux/slab.h>
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#include <linux/firmware.h>
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#include <linux/delay.h>
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#include <linux/mmc/card.h>
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#include <linux/mmc/sdio_func.h>
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#include <linux/mmc/sdio_ids.h>
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#include <linux/module.h>
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#include "sms-cards.h"
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#include "smsendian.h"
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/* Registers */
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#define SMSSDIO_DATA 0x00
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#define SMSSDIO_INT 0x04
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#define SMSSDIO_BLOCK_SIZE 128
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static const struct sdio_device_id smssdio_ids[] = {
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{SDIO_DEVICE(SDIO_VENDOR_ID_SIANO, SDIO_DEVICE_ID_SIANO_STELLAR),
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.driver_data = SMS1XXX_BOARD_SIANO_STELLAR},
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{SDIO_DEVICE(SDIO_VENDOR_ID_SIANO, SDIO_DEVICE_ID_SIANO_NOVA_A0),
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.driver_data = SMS1XXX_BOARD_SIANO_NOVA_A},
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{SDIO_DEVICE(SDIO_VENDOR_ID_SIANO, SDIO_DEVICE_ID_SIANO_NOVA_B0),
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.driver_data = SMS1XXX_BOARD_SIANO_NOVA_B},
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{SDIO_DEVICE(SDIO_VENDOR_ID_SIANO, SDIO_DEVICE_ID_SIANO_VEGA_A0),
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.driver_data = SMS1XXX_BOARD_SIANO_VEGA},
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{SDIO_DEVICE(SDIO_VENDOR_ID_SIANO, SDIO_DEVICE_ID_SIANO_VENICE),
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.driver_data = SMS1XXX_BOARD_SIANO_VEGA},
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{SDIO_DEVICE(SDIO_VENDOR_ID_SIANO, SDIO_DEVICE_ID_SIANO_MING),
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.driver_data = SMS1XXX_BOARD_SIANO_MING},
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{SDIO_DEVICE(SDIO_VENDOR_ID_SIANO, SDIO_DEVICE_ID_SIANO_PELE),
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.driver_data = SMS1XXX_BOARD_SIANO_PELE},
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{SDIO_DEVICE(SDIO_VENDOR_ID_SIANO, SDIO_DEVICE_ID_SIANO_RIO),
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.driver_data = SMS1XXX_BOARD_SIANO_RIO},
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{SDIO_DEVICE(SDIO_VENDOR_ID_SIANO, SDIO_DEVICE_ID_SIANO_DENVER_2160),
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.driver_data = SMS1XXX_BOARD_SIANO_DENVER_2160},
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{SDIO_DEVICE(SDIO_VENDOR_ID_SIANO, SDIO_DEVICE_ID_SIANO_DENVER_1530),
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.driver_data = SMS1XXX_BOARD_SIANO_DENVER_1530},
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{ /* end: all zeroes */ },
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};
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MODULE_DEVICE_TABLE(sdio, smssdio_ids);
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struct smssdio_device {
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struct sdio_func *func;
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struct smscore_device_t *coredev;
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struct smscore_buffer_t *split_cb;
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};
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/*******************************************************************/
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/* Siano core callbacks */
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/*******************************************************************/
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static int smssdio_sendrequest(void *context, void *buffer, size_t size)
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{
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int ret = 0;
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struct smssdio_device *smsdev;
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smsdev = context;
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sdio_claim_host(smsdev->func);
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smsendian_handle_tx_message((struct sms_msg_data *) buffer);
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while (size >= smsdev->func->cur_blksize) {
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ret = sdio_memcpy_toio(smsdev->func, SMSSDIO_DATA,
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buffer, smsdev->func->cur_blksize);
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if (ret)
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goto out;
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buffer += smsdev->func->cur_blksize;
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size -= smsdev->func->cur_blksize;
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}
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if (size) {
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ret = sdio_memcpy_toio(smsdev->func, SMSSDIO_DATA,
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buffer, size);
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}
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out:
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sdio_release_host(smsdev->func);
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return ret;
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}
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/*******************************************************************/
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/* SDIO callbacks */
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/*******************************************************************/
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static void smssdio_interrupt(struct sdio_func *func)
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{
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int ret;
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struct smssdio_device *smsdev;
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struct smscore_buffer_t *cb;
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struct sms_msg_hdr *hdr;
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size_t size;
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smsdev = sdio_get_drvdata(func);
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/*
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* The interrupt register has no defined meaning. It is just
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* a way of turning of the level triggered interrupt.
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*/
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(void)sdio_readb(func, SMSSDIO_INT, &ret);
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if (ret) {
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pr_err("Unable to read interrupt register!\n");
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return;
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}
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if (smsdev->split_cb == NULL) {
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cb = smscore_getbuffer(smsdev->coredev);
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if (!cb) {
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pr_err("Unable to allocate data buffer!\n");
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return;
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}
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ret = sdio_memcpy_fromio(smsdev->func,
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cb->p,
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SMSSDIO_DATA,
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SMSSDIO_BLOCK_SIZE);
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if (ret) {
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pr_err("Error %d reading initial block!\n", ret);
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return;
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}
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hdr = cb->p;
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if (hdr->msg_flags & MSG_HDR_FLAG_SPLIT_MSG) {
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smsdev->split_cb = cb;
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return;
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}
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if (hdr->msg_length > smsdev->func->cur_blksize)
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size = hdr->msg_length - smsdev->func->cur_blksize;
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else
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size = 0;
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} else {
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cb = smsdev->split_cb;
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hdr = cb->p;
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size = hdr->msg_length - sizeof(struct sms_msg_hdr);
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smsdev->split_cb = NULL;
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}
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if (size) {
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void *buffer;
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buffer = cb->p + (hdr->msg_length - size);
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size = ALIGN(size, SMSSDIO_BLOCK_SIZE);
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BUG_ON(smsdev->func->cur_blksize != SMSSDIO_BLOCK_SIZE);
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/*
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* First attempt to transfer all of it in one go...
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*/
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ret = sdio_memcpy_fromio(smsdev->func,
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buffer,
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SMSSDIO_DATA,
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size);
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if (ret && ret != -EINVAL) {
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smscore_putbuffer(smsdev->coredev, cb);
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pr_err("Error %d reading data from card!\n", ret);
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return;
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}
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/*
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* ..then fall back to one block at a time if that is
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* not possible...
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*
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* (we have to do this manually because of the
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* problem with the "increase address" bit)
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*/
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if (ret == -EINVAL) {
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while (size) {
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ret = sdio_memcpy_fromio(smsdev->func,
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buffer, SMSSDIO_DATA,
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smsdev->func->cur_blksize);
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if (ret) {
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smscore_putbuffer(smsdev->coredev, cb);
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pr_err("Error %d reading data from card!\n",
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ret);
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return;
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}
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buffer += smsdev->func->cur_blksize;
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if (size > smsdev->func->cur_blksize)
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size -= smsdev->func->cur_blksize;
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else
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size = 0;
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}
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}
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}
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cb->size = hdr->msg_length;
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cb->offset = 0;
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smsendian_handle_rx_message((struct sms_msg_data *) cb->p);
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smscore_onresponse(smsdev->coredev, cb);
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}
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static int smssdio_probe(struct sdio_func *func,
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const struct sdio_device_id *id)
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{
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int ret;
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int board_id;
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struct smssdio_device *smsdev;
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struct smsdevice_params_t params;
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board_id = id->driver_data;
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smsdev = kzalloc(sizeof(struct smssdio_device), GFP_KERNEL);
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if (!smsdev)
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return -ENOMEM;
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smsdev->func = func;
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memset(¶ms, 0, sizeof(struct smsdevice_params_t));
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params.device = &func->dev;
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params.buffer_size = 0x5000; /* ?? */
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params.num_buffers = 22; /* ?? */
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params.context = smsdev;
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snprintf(params.devpath, sizeof(params.devpath),
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"sdio\\%s", sdio_func_id(func));
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params.sendrequest_handler = smssdio_sendrequest;
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params.device_type = sms_get_board(board_id)->type;
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if (params.device_type != SMS_STELLAR)
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params.flags |= SMS_DEVICE_FAMILY2;
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else {
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/*
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* FIXME: Stellar needs special handling...
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*/
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ret = -ENODEV;
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goto free;
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}
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ret = smscore_register_device(¶ms, &smsdev->coredev, GFP_DMA, NULL);
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if (ret < 0)
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goto free;
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smscore_set_board_id(smsdev->coredev, board_id);
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sdio_claim_host(func);
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ret = sdio_enable_func(func);
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if (ret)
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goto release;
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ret = sdio_set_block_size(func, SMSSDIO_BLOCK_SIZE);
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if (ret)
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goto disable;
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ret = sdio_claim_irq(func, smssdio_interrupt);
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if (ret)
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goto disable;
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sdio_set_drvdata(func, smsdev);
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sdio_release_host(func);
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ret = smscore_start_device(smsdev->coredev);
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if (ret < 0)
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goto reclaim;
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return 0;
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reclaim:
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sdio_claim_host(func);
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sdio_release_irq(func);
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disable:
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sdio_disable_func(func);
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release:
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sdio_release_host(func);
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smscore_unregister_device(smsdev->coredev);
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free:
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kfree(smsdev);
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return ret;
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}
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static void smssdio_remove(struct sdio_func *func)
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{
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struct smssdio_device *smsdev;
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smsdev = sdio_get_drvdata(func);
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/* FIXME: racy! */
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if (smsdev->split_cb)
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smscore_putbuffer(smsdev->coredev, smsdev->split_cb);
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smscore_unregister_device(smsdev->coredev);
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sdio_claim_host(func);
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sdio_release_irq(func);
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sdio_disable_func(func);
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sdio_release_host(func);
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kfree(smsdev);
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}
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static struct sdio_driver smssdio_driver = {
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.name = "smssdio",
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.id_table = smssdio_ids,
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.probe = smssdio_probe,
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.remove = smssdio_remove,
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};
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/*******************************************************************/
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/* Module functions */
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/*******************************************************************/
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static int __init smssdio_module_init(void)
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{
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int ret = 0;
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printk(KERN_INFO "smssdio: Siano SMS1xxx SDIO driver\n");
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printk(KERN_INFO "smssdio: Copyright Pierre Ossman\n");
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ret = sdio_register_driver(&smssdio_driver);
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return ret;
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}
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static void __exit smssdio_module_exit(void)
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{
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sdio_unregister_driver(&smssdio_driver);
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}
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module_init(smssdio_module_init);
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module_exit(smssdio_module_exit);
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MODULE_DESCRIPTION("Siano SMS1xxx SDIO driver");
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MODULE_AUTHOR("Pierre Ossman");
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MODULE_LICENSE("GPL");
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