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Diffstat (limited to 'drivers/mmc/host/sdricoh_cs.c')
-rw-r--r--drivers/mmc/host/sdricoh_cs.c528
1 files changed, 528 insertions, 0 deletions
diff --git a/drivers/mmc/host/sdricoh_cs.c b/drivers/mmc/host/sdricoh_cs.c
new file mode 100644
index 0000000000..57b8c1a967
--- /dev/null
+++ b/drivers/mmc/host/sdricoh_cs.c
@@ -0,0 +1,528 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * sdricoh_cs.c - driver for Ricoh Secure Digital Card Readers that can be
+ * found on some Ricoh RL5c476 II cardbus bridge
+ *
+ * Copyright (C) 2006 - 2008 Sascha Sommer <saschasommer@freenet.de>
+ */
+
+/*
+#define DEBUG
+#define VERBOSE_DEBUG
+*/
+#include <linux/delay.h>
+#include <linux/highmem.h>
+#include <linux/module.h>
+#include <linux/pci.h>
+#include <linux/ioport.h>
+#include <linux/iopoll.h>
+#include <linux/scatterlist.h>
+
+#include <pcmcia/cistpl.h>
+#include <pcmcia/ds.h>
+#include <linux/io.h>
+
+#include <linux/mmc/host.h>
+#include <linux/mmc/mmc.h>
+
+#define DRIVER_NAME "sdricoh_cs"
+
+static unsigned int switchlocked;
+
+/* i/o region */
+#define SDRICOH_PCI_REGION 0
+#define SDRICOH_PCI_REGION_SIZE 0x1000
+
+/* registers */
+#define R104_VERSION 0x104
+#define R200_CMD 0x200
+#define R204_CMD_ARG 0x204
+#define R208_DATAIO 0x208
+#define R20C_RESP 0x20c
+#define R21C_STATUS 0x21c
+#define R2E0_INIT 0x2e0
+#define R2E4_STATUS_RESP 0x2e4
+#define R2F0_RESET 0x2f0
+#define R224_MODE 0x224
+#define R226_BLOCKSIZE 0x226
+#define R228_POWER 0x228
+#define R230_DATA 0x230
+
+/* flags for the R21C_STATUS register */
+#define STATUS_CMD_FINISHED 0x00000001
+#define STATUS_TRANSFER_FINISHED 0x00000004
+#define STATUS_CARD_INSERTED 0x00000020
+#define STATUS_CARD_LOCKED 0x00000080
+#define STATUS_CMD_TIMEOUT 0x00400000
+#define STATUS_READY_TO_READ 0x01000000
+#define STATUS_READY_TO_WRITE 0x02000000
+#define STATUS_BUSY 0x40000000
+
+/* timeouts */
+#define SDRICOH_CMD_TIMEOUT_US 1000000
+#define SDRICOH_DATA_TIMEOUT_US 1000000
+
+/* list of supported pcmcia devices */
+static const struct pcmcia_device_id pcmcia_ids[] = {
+ /* vendor and device strings followed by their crc32 hashes */
+ PCMCIA_DEVICE_PROD_ID12("RICOH", "Bay1Controller", 0xd9f522ed,
+ 0xc3901202),
+ PCMCIA_DEVICE_PROD_ID12("RICOH", "Bay Controller", 0xd9f522ed,
+ 0xace80909),
+ PCMCIA_DEVICE_NULL,
+};
+
+MODULE_DEVICE_TABLE(pcmcia, pcmcia_ids);
+
+/* mmc privdata */
+struct sdricoh_host {
+ struct device *dev;
+ struct mmc_host *mmc; /* MMC structure */
+ unsigned char __iomem *iobase;
+ struct pci_dev *pci_dev;
+ int app_cmd;
+};
+
+/***************** register i/o helper functions *****************************/
+
+static inline unsigned int sdricoh_readl(struct sdricoh_host *host,
+ unsigned int reg)
+{
+ unsigned int value = readl(host->iobase + reg);
+ dev_vdbg(host->dev, "rl %x 0x%x\n", reg, value);
+ return value;
+}
+
+static inline void sdricoh_writel(struct sdricoh_host *host, unsigned int reg,
+ unsigned int value)
+{
+ writel(value, host->iobase + reg);
+ dev_vdbg(host->dev, "wl %x 0x%x\n", reg, value);
+
+}
+
+static inline void sdricoh_writew(struct sdricoh_host *host, unsigned int reg,
+ unsigned short value)
+{
+ writew(value, host->iobase + reg);
+ dev_vdbg(host->dev, "ww %x 0x%x\n", reg, value);
+}
+
+static inline unsigned int sdricoh_readb(struct sdricoh_host *host,
+ unsigned int reg)
+{
+ unsigned int value = readb(host->iobase + reg);
+ dev_vdbg(host->dev, "rb %x 0x%x\n", reg, value);
+ return value;
+}
+
+static bool sdricoh_status_ok(struct sdricoh_host *host, unsigned int status,
+ unsigned int wanted)
+{
+ sdricoh_writel(host, R2E4_STATUS_RESP, status);
+ return status & wanted;
+}
+
+static int sdricoh_query_status(struct sdricoh_host *host, unsigned int wanted)
+{
+ int ret;
+ unsigned int status = 0;
+ struct device *dev = host->dev;
+
+ ret = read_poll_timeout(sdricoh_readl, status,
+ sdricoh_status_ok(host, status, wanted),
+ 32, SDRICOH_DATA_TIMEOUT_US, false,
+ host, R21C_STATUS);
+ if (ret) {
+ dev_err(dev, "query_status: timeout waiting for %x\n", wanted);
+ return -ETIMEDOUT;
+ }
+
+ /* do not do this check in the loop as some commands fail otherwise */
+ if (status & 0x7F0000) {
+ dev_err(dev, "waiting for status bit %x failed\n", wanted);
+ return -EINVAL;
+ }
+ return 0;
+
+}
+
+static int sdricoh_mmc_cmd(struct sdricoh_host *host, struct mmc_command *cmd)
+{
+ unsigned int status, timeout_us;
+ int ret;
+ unsigned char opcode = cmd->opcode;
+
+ /* reset status reg? */
+ sdricoh_writel(host, R21C_STATUS, 0x18);
+
+ /* MMC_APP_CMDs need some special handling */
+ if (host->app_cmd) {
+ opcode |= 64;
+ host->app_cmd = 0;
+ } else if (opcode == MMC_APP_CMD)
+ host->app_cmd = 1;
+
+ /* fill parameters */
+ sdricoh_writel(host, R204_CMD_ARG, cmd->arg);
+ sdricoh_writel(host, R200_CMD, (0x10000 << 8) | opcode);
+
+ /* wait for command completion */
+ if (!opcode)
+ return 0;
+
+ timeout_us = cmd->busy_timeout ? cmd->busy_timeout * 1000 :
+ SDRICOH_CMD_TIMEOUT_US;
+
+ ret = read_poll_timeout(sdricoh_readl, status,
+ sdricoh_status_ok(host, status, STATUS_CMD_FINISHED),
+ 32, timeout_us, false,
+ host, R21C_STATUS);
+
+ /*
+ * Don't check for timeout status in the loop, as it's not always reset
+ * correctly.
+ */
+ if (ret || status & STATUS_CMD_TIMEOUT)
+ return -ETIMEDOUT;
+
+ return 0;
+}
+
+static int sdricoh_reset(struct sdricoh_host *host)
+{
+ dev_dbg(host->dev, "reset\n");
+ sdricoh_writel(host, R2F0_RESET, 0x10001);
+ sdricoh_writel(host, R2E0_INIT, 0x10000);
+ if (sdricoh_readl(host, R2E0_INIT) != 0x10000)
+ return -EIO;
+ sdricoh_writel(host, R2E0_INIT, 0x10007);
+
+ sdricoh_writel(host, R224_MODE, 0x2000000);
+ sdricoh_writel(host, R228_POWER, 0xe0);
+
+
+ /* status register ? */
+ sdricoh_writel(host, R21C_STATUS, 0x18);
+
+ return 0;
+}
+
+static int sdricoh_blockio(struct sdricoh_host *host, int read,
+ u8 *buf, int len)
+{
+ int size;
+ u32 data = 0;
+ /* wait until the data is available */
+ if (read) {
+ if (sdricoh_query_status(host, STATUS_READY_TO_READ))
+ return -ETIMEDOUT;
+ sdricoh_writel(host, R21C_STATUS, 0x18);
+ /* read data */
+ while (len) {
+ data = sdricoh_readl(host, R230_DATA);
+ size = min(len, 4);
+ len -= size;
+ while (size) {
+ *buf = data & 0xFF;
+ buf++;
+ data >>= 8;
+ size--;
+ }
+ }
+ } else {
+ if (sdricoh_query_status(host, STATUS_READY_TO_WRITE))
+ return -ETIMEDOUT;
+ sdricoh_writel(host, R21C_STATUS, 0x18);
+ /* write data */
+ while (len) {
+ size = min(len, 4);
+ len -= size;
+ while (size) {
+ data >>= 8;
+ data |= (u32)*buf << 24;
+ buf++;
+ size--;
+ }
+ sdricoh_writel(host, R230_DATA, data);
+ }
+ }
+
+ return 0;
+}
+
+static void sdricoh_request(struct mmc_host *mmc, struct mmc_request *mrq)
+{
+ struct sdricoh_host *host = mmc_priv(mmc);
+ struct mmc_command *cmd = mrq->cmd;
+ struct mmc_data *data = cmd->data;
+ struct device *dev = host->dev;
+ int i;
+
+ dev_dbg(dev, "=============================\n");
+ dev_dbg(dev, "sdricoh_request opcode=%i\n", cmd->opcode);
+
+ sdricoh_writel(host, R21C_STATUS, 0x18);
+
+ /* read/write commands seem to require this */
+ if (data) {
+ sdricoh_writew(host, R226_BLOCKSIZE, data->blksz);
+ sdricoh_writel(host, R208_DATAIO, 0);
+ }
+
+ cmd->error = sdricoh_mmc_cmd(host, cmd);
+
+ /* read response buffer */
+ if (cmd->flags & MMC_RSP_PRESENT) {
+ if (cmd->flags & MMC_RSP_136) {
+ /* CRC is stripped so we need to do some shifting. */
+ for (i = 0; i < 4; i++) {
+ cmd->resp[i] =
+ sdricoh_readl(host,
+ R20C_RESP + (3 - i) * 4) << 8;
+ if (i != 3)
+ cmd->resp[i] |=
+ sdricoh_readb(host, R20C_RESP +
+ (3 - i) * 4 - 1);
+ }
+ } else
+ cmd->resp[0] = sdricoh_readl(host, R20C_RESP);
+ }
+
+ /* transfer data */
+ if (data && cmd->error == 0) {
+ dev_dbg(dev, "transfer: blksz %i blocks %i sg_len %i "
+ "sg length %i\n", data->blksz, data->blocks,
+ data->sg_len, data->sg->length);
+
+ /* enter data reading mode */
+ sdricoh_writel(host, R21C_STATUS, 0x837f031e);
+ for (i = 0; i < data->blocks; i++) {
+ size_t len = data->blksz;
+ u8 *buf;
+ struct page *page;
+ int result;
+ page = sg_page(data->sg);
+
+ buf = kmap(page) + data->sg->offset + (len * i);
+ result =
+ sdricoh_blockio(host,
+ data->flags & MMC_DATA_READ, buf, len);
+ kunmap(page);
+ flush_dcache_page(page);
+ if (result) {
+ dev_err(dev, "sdricoh_request: cmd %i "
+ "block transfer failed\n", cmd->opcode);
+ cmd->error = result;
+ break;
+ } else
+ data->bytes_xfered += len;
+ }
+
+ sdricoh_writel(host, R208_DATAIO, 1);
+
+ if (sdricoh_query_status(host, STATUS_TRANSFER_FINISHED)) {
+ dev_err(dev, "sdricoh_request: transfer end error\n");
+ cmd->error = -EINVAL;
+ }
+ }
+ /* FIXME check busy flag */
+
+ mmc_request_done(mmc, mrq);
+ dev_dbg(dev, "=============================\n");
+}
+
+static void sdricoh_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
+{
+ struct sdricoh_host *host = mmc_priv(mmc);
+ dev_dbg(host->dev, "set_ios\n");
+
+ if (ios->power_mode == MMC_POWER_ON) {
+ sdricoh_writel(host, R228_POWER, 0xc0e0);
+
+ if (ios->bus_width == MMC_BUS_WIDTH_4) {
+ sdricoh_writel(host, R224_MODE, 0x2000300);
+ sdricoh_writel(host, R228_POWER, 0x40e0);
+ } else {
+ sdricoh_writel(host, R224_MODE, 0x2000340);
+ }
+
+ } else if (ios->power_mode == MMC_POWER_UP) {
+ sdricoh_writel(host, R224_MODE, 0x2000320);
+ sdricoh_writel(host, R228_POWER, 0xe0);
+ }
+}
+
+static int sdricoh_get_ro(struct mmc_host *mmc)
+{
+ struct sdricoh_host *host = mmc_priv(mmc);
+ unsigned int status;
+
+ status = sdricoh_readl(host, R21C_STATUS);
+ sdricoh_writel(host, R2E4_STATUS_RESP, status);
+
+ /* some notebooks seem to have the locked flag switched */
+ if (switchlocked)
+ return !(status & STATUS_CARD_LOCKED);
+
+ return (status & STATUS_CARD_LOCKED);
+}
+
+static const struct mmc_host_ops sdricoh_ops = {
+ .request = sdricoh_request,
+ .set_ios = sdricoh_set_ios,
+ .get_ro = sdricoh_get_ro,
+};
+
+/* initialize the control and register it to the mmc framework */
+static int sdricoh_init_mmc(struct pci_dev *pci_dev,
+ struct pcmcia_device *pcmcia_dev)
+{
+ int result;
+ void __iomem *iobase;
+ struct mmc_host *mmc;
+ struct sdricoh_host *host;
+ struct device *dev = &pcmcia_dev->dev;
+ /* map iomem */
+ if (pci_resource_len(pci_dev, SDRICOH_PCI_REGION) !=
+ SDRICOH_PCI_REGION_SIZE) {
+ dev_dbg(dev, "unexpected pci resource len\n");
+ return -ENODEV;
+ }
+ iobase =
+ pci_iomap(pci_dev, SDRICOH_PCI_REGION, SDRICOH_PCI_REGION_SIZE);
+ if (!iobase) {
+ dev_err(dev, "unable to map iobase\n");
+ return -ENODEV;
+ }
+ /* check version? */
+ if (readl(iobase + R104_VERSION) != 0x4000) {
+ dev_dbg(dev, "no supported mmc controller found\n");
+ result = -ENODEV;
+ goto unmap_io;
+ }
+ /* allocate privdata */
+ mmc = pcmcia_dev->priv =
+ mmc_alloc_host(sizeof(struct sdricoh_host), &pcmcia_dev->dev);
+ if (!mmc) {
+ dev_err(dev, "mmc_alloc_host failed\n");
+ result = -ENOMEM;
+ goto unmap_io;
+ }
+ host = mmc_priv(mmc);
+
+ host->iobase = iobase;
+ host->dev = dev;
+ host->pci_dev = pci_dev;
+
+ mmc->ops = &sdricoh_ops;
+
+ /* FIXME: frequency and voltage handling is done by the controller
+ */
+ mmc->f_min = 450000;
+ mmc->f_max = 24000000;
+ mmc->ocr_avail = MMC_VDD_32_33 | MMC_VDD_33_34;
+ mmc->caps |= MMC_CAP_4_BIT_DATA;
+
+ mmc->max_seg_size = 1024 * 512;
+ mmc->max_blk_size = 512;
+
+ /* reset the controller */
+ if (sdricoh_reset(host)) {
+ dev_dbg(dev, "could not reset\n");
+ result = -EIO;
+ goto free_host;
+ }
+
+ result = mmc_add_host(mmc);
+
+ if (!result) {
+ dev_dbg(dev, "mmc host registered\n");
+ return 0;
+ }
+free_host:
+ mmc_free_host(mmc);
+unmap_io:
+ pci_iounmap(pci_dev, iobase);
+ return result;
+}
+
+/* search for supported mmc controllers */
+static int sdricoh_pcmcia_probe(struct pcmcia_device *pcmcia_dev)
+{
+ struct pci_dev *pci_dev = NULL;
+
+ dev_info(&pcmcia_dev->dev, "Searching MMC controller for pcmcia device"
+ " %s %s ...\n", pcmcia_dev->prod_id[0], pcmcia_dev->prod_id[1]);
+
+ /* search pci cardbus bridge that contains the mmc controller */
+ /* the io region is already claimed by yenta_socket... */
+ while ((pci_dev =
+ pci_get_device(PCI_VENDOR_ID_RICOH, PCI_DEVICE_ID_RICOH_RL5C476,
+ pci_dev))) {
+ /* try to init the device */
+ if (!sdricoh_init_mmc(pci_dev, pcmcia_dev)) {
+ dev_info(&pcmcia_dev->dev, "MMC controller found\n");
+ return 0;
+ }
+
+ }
+ dev_err(&pcmcia_dev->dev, "No MMC controller was found.\n");
+ return -ENODEV;
+}
+
+static void sdricoh_pcmcia_detach(struct pcmcia_device *link)
+{
+ struct mmc_host *mmc = link->priv;
+
+ dev_dbg(&link->dev, "detach\n");
+
+ /* remove mmc host */
+ if (mmc) {
+ struct sdricoh_host *host = mmc_priv(mmc);
+ mmc_remove_host(mmc);
+ pci_iounmap(host->pci_dev, host->iobase);
+ pci_dev_put(host->pci_dev);
+ mmc_free_host(mmc);
+ }
+ pcmcia_disable_device(link);
+
+}
+
+#ifdef CONFIG_PM
+static int sdricoh_pcmcia_suspend(struct pcmcia_device *link)
+{
+ dev_dbg(&link->dev, "suspend\n");
+ return 0;
+}
+
+static int sdricoh_pcmcia_resume(struct pcmcia_device *link)
+{
+ struct mmc_host *mmc = link->priv;
+ dev_dbg(&link->dev, "resume\n");
+ sdricoh_reset(mmc_priv(mmc));
+ return 0;
+}
+#else
+#define sdricoh_pcmcia_suspend NULL
+#define sdricoh_pcmcia_resume NULL
+#endif
+
+static struct pcmcia_driver sdricoh_driver = {
+ .name = DRIVER_NAME,
+ .probe = sdricoh_pcmcia_probe,
+ .remove = sdricoh_pcmcia_detach,
+ .id_table = pcmcia_ids,
+ .suspend = sdricoh_pcmcia_suspend,
+ .resume = sdricoh_pcmcia_resume,
+};
+module_pcmcia_driver(sdricoh_driver);
+
+module_param(switchlocked, uint, 0444);
+
+MODULE_AUTHOR("Sascha Sommer <saschasommer@freenet.de>");
+MODULE_DESCRIPTION("Ricoh PCMCIA Secure Digital Interface driver");
+MODULE_LICENSE("GPL");
+
+MODULE_PARM_DESC(switchlocked, "Switch the cards locked status."
+ "Use this when unlocked cards are shown readonly (default 0)");
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-02 02:28:23 +0000