[PATCH] USB: add sl811_cs support

This adds support for a CF-card USB Host adapter, the Ratoc REX-CFU1U, by
wrapping a PCMCIA driver around the existing "sl811-hcd" platform driver.

This CF card is especially useful for PDAs, which currently tend to have
no other solution for USB host capability.

From: Botond Botyanszki <boti@rocketmail.com>
Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

3 files changed, 454 insertions, 0 deletions

diff --git a/drivers/usb/host/Kconfig b/drivers/usb/host/Kconfig
index 3196c3265ff5..19e598c9641f 100644
--- a/drivers/usb/host/Kconfig
+++ b/drivers/usb/host/Kconfig
@@ -124,3 +124,14 @@ config USB_SL811_HCD
           To compile this driver as a module, choose M here: the
           module will be called sl811-hcd.
 
+config USB_SL811_CS
+        tristate "CF/PCMCIA support for SL811HS HCD"
+        depends on USB_SL811_HCD && PCMCIA
+        default N
+        help
+          Wraps a PCMCIA driver around the SL811HS HCD, supporting the RATOC
+          REX-CFU1U CF card (often used with PDAs).  If unsure, say N.
+
+          To compile this driver as a module, choose M here: the
+          module will be called "sl811_cs".
+
diff --git a/drivers/usb/host/Makefile b/drivers/usb/host/Makefile
index a574ca06cf6b..5dbd3e7a27c7 100644
--- a/drivers/usb/host/Makefile
+++ b/drivers/usb/host/Makefile
@@ -7,4 +7,5 @@ obj-$(CONFIG_USB_EHCI_HCD)	+= ehci-hcd.o
 obj-$(CONFIG_USB_OHCI_HCD)      += ohci-hcd.o
 obj-$(CONFIG_USB_UHCI_HCD)      += uhci-hcd.o
 obj-$(CONFIG_USB_SL811_HCD)     += sl811-hcd.o
+obj-$(CONFIG_USB_SL811_CS)      += sl811_cs.o
 obj-$(CONFIG_ETRAX_ARCH_V10)    += hc_crisv10.o
diff --git a/drivers/usb/host/sl811_cs.c b/drivers/usb/host/sl811_cs.c
new file mode 100644
index 000000000000..6e173265095c
--- /dev/null
+++ b/drivers/usb/host/sl811_cs.c
@@ -0,0 +1,442 @@
+/*
+ * PCMCIA driver for SL811HS (as found in REX-CFU1U)
+ * Filename: sl811_cs.c
+ * Author:   Yukio Yamamoto
+ *
+ *  Port to sl811-hcd and 2.6.x by
+ *    Botond Botyanszki <boti@rocketmail.com>
+ *    Simon Pickering
+ *
+ *  Last update: 2005-05-12
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/sched.h>
+#include <linux/ptrace.h>
+#include <linux/slab.h>
+#include <linux/string.h>
+#include <linux/timer.h>
+#include <linux/ioport.h>
+
+#include <pcmcia/version.h>
+#include <pcmcia/cs_types.h>
+#include <pcmcia/cs.h>
+#include <pcmcia/cistpl.h>
+#include <pcmcia/cisreg.h>
+#include <pcmcia/ds.h>
+
+#include <linux/usb_sl811.h>
+
+MODULE_AUTHOR("Botond Botyanszki");
+MODULE_DESCRIPTION("REX-CFU1U PCMCIA driver for 2.6");
+MODULE_LICENSE("GPL");
+
+
+/*====================================================================*/
+/* MACROS                                                             */
+/*====================================================================*/
+
+#if defined(DEBUG) || defined(CONFIG_USB_DEBUG) || defined(PCMCIA_DEBUG)
+
+static int pc_debug = 0;
+module_param(pc_debug, int, 0644);
+
+#define DBG(n, args...) if (pc_debug>(n)) printk(KERN_DEBUG "sl811_cs: " args)
+
+#else
+#define DBG(n, args...) do{}while(0)
+#endif  /* no debugging */
+
+#define INFO(args...) printk(KERN_INFO "sl811_cs: " args)
+
+#define INT_MODULE_PARM(n, v) static int n = v; module_param(n, int, 0444)
+
+#define CS_CHECK(fn, ret) \
+        do { \
+                last_fn = (fn); \
+                if ((last_ret = (ret)) != 0) \
+                        goto cs_failed; \
+        } while (0)
+
+/*====================================================================*/
+/* VARIABLES                                                          */
+/*====================================================================*/
+
+static const char driver_name[DEV_NAME_LEN]  = "sl811_cs";
+
+static dev_link_t *dev_list = NULL;
+
+static int irq_list[4] = { -1 };
+static int irq_list_count;
+
+module_param_array(irq_list, int, &irq_list_count, 0444);
+
+INT_MODULE_PARM(irq_mask, 0xdeb8);
+
+typedef struct local_info_t {
+        dev_link_t              link;
+        dev_node_t              node;
+} local_info_t;
+
+/*====================================================================*/
+
+static void release_platform_dev(struct device * dev)
+{
+        DBG(0, "sl811_cs platform_dev release\n");
+        dev->parent = NULL;
+}
+
+static struct sl811_platform_data platform_data = {
+        .potpg          = 100,
+        .power          = 50,           /* == 100mA */
+        // .reset       = ... FIXME:  invoke CF reset on the card
+};
+
+static struct resource resources[] = {
+        [0] = {
+                .flags  = IORESOURCE_IRQ,
+        },
+        [1] = {
+                // .name   = "address",
+                .flags  = IORESOURCE_IO,
+        },
+        [2] = {
+                // .name   = "data",
+                .flags  = IORESOURCE_IO,
+        },
+};
+
+extern struct device_driver sl811h_driver;
+
+static struct platform_device platform_dev = {
+        .id                     = -1,
+        .dev = {
+                .platform_data = &platform_data,
+                .release       = release_platform_dev,
+        },
+        .resource               = resources,
+        .num_resources          = ARRAY_SIZE(resources),
+};
+
+static int sl811_hc_init(struct device *parent, ioaddr_t base_addr, int irq)
+{
+        if (platform_dev.dev.parent)
+                return -EBUSY;
+        platform_dev.dev.parent = parent;
+
+        /* finish seting up the platform device */
+        resources[0].start = irq;
+
+        resources[1].start = base_addr;
+        resources[1].end = base_addr;
+
+        resources[2].start = base_addr + 1;
+        resources[2].end   = base_addr + 1;
+
+        /* The driver core will probe for us.  We know sl811-hcd has been
+         * initialized already because of the link order dependency.
+         */
+        platform_dev.name = sl811h_driver.name;
+        return platform_device_register(&platform_dev);
+}
+
+/*====================================================================*/
+
+static void sl811_cs_detach(dev_link_t *link)
+{
+        dev_link_t **linkp;
+
+        DBG(0, "sl811_cs_detach(0x%p)\n", link);
+
+        /* Locate device structure */
+        for (linkp = &dev_list; *linkp; linkp = &(*linkp)->next) {
+                if (*linkp == link)
+                        break;
+        }
+        if (*linkp == NULL)
+                return;
+
+        /* Break the link with Card Services */
+        if (link->handle)
+                pcmcia_deregister_client(link->handle);
+
+        /* Unlink device structure, and free it */
+        *linkp = link->next;
+        /* This points to the parent local_info_t struct */
+        kfree(link->priv);
+}
+
+static void sl811_cs_release(dev_link_t * link)
+{
+
+        DBG(0, "sl811_cs_release(0x%p)\n", link);
+
+        if (link->open) {
+                DBG(1, "sl811_cs: release postponed, '%s' still open\n",
+                    link->dev->dev_name);
+                link->state |= DEV_STALE_CONFIG;
+                return;
+        }
+
+        /* Unlink the device chain */
+        link->dev = NULL;
+
+        platform_device_unregister(&platform_dev);
+        pcmcia_release_configuration(link->handle);
+        if (link->io.NumPorts1)
+                pcmcia_release_io(link->handle, &link->io);
+        if (link->irq.AssignedIRQ)
+                pcmcia_release_irq(link->handle, &link->irq);
+        link->state &= ~DEV_CONFIG;
+
+        if (link->state & DEV_STALE_LINK)
+                sl811_cs_detach(link);
+}
+
+static void sl811_cs_config(dev_link_t *link)
+{
+        client_handle_t         handle = link->handle;
+        struct device           *parent = &handle_to_dev(handle);
+        local_info_t            *dev = link->priv;
+        tuple_t                 tuple;
+        cisparse_t              parse;
+        int                     last_fn, last_ret;
+        u_char                  buf[64];
+        config_info_t           conf;
+        cistpl_cftable_entry_t  dflt = { 0 };
+
+        DBG(0, "sl811_cs_config(0x%p)\n", link);
+
+        tuple.DesiredTuple = CISTPL_CONFIG;
+        tuple.Attributes = 0;
+        tuple.TupleData = buf;
+        tuple.TupleDataMax = sizeof(buf);
+        tuple.TupleOffset = 0;
+        CS_CHECK(GetFirstTuple, pcmcia_get_first_tuple(handle, &tuple));
+        CS_CHECK(GetTupleData, pcmcia_get_tuple_data(handle, &tuple));
+        CS_CHECK(ParseTuple, pcmcia_parse_tuple(handle, &tuple, &parse));
+        link->conf.ConfigBase = parse.config.base;
+        link->conf.Present = parse.config.rmask[0];
+
+        /* Configure card */
+        link->state |= DEV_CONFIG;
+
+        /* Look up the current Vcc */
+        CS_CHECK(GetConfigurationInfo,
+                        pcmcia_get_configuration_info(handle, &conf));
+        link->conf.Vcc = conf.Vcc;
+
+        tuple.DesiredTuple = CISTPL_CFTABLE_ENTRY;
+        CS_CHECK(GetFirstTuple, pcmcia_get_first_tuple(handle, &tuple));
+        while (1) {
+                cistpl_cftable_entry_t  *cfg = &(parse.cftable_entry);
+
+                if (pcmcia_get_tuple_data(handle, &tuple) != 0
+                                || pcmcia_parse_tuple(handle, &tuple, &parse)
+                                                != 0)
+                        goto next_entry;
+
+                if (cfg->flags & CISTPL_CFTABLE_DEFAULT) {
+                        dflt = *cfg;
+                }
+
+                if (cfg->index == 0)
+                        goto next_entry;
+
+                link->conf.ConfigIndex = cfg->index;
+
+                /* Use power settings for Vcc and Vpp if present */
+                /*  Note that the CIS values need to be rescaled */
+                if (cfg->vcc.present & (1<<CISTPL_POWER_VNOM)) {
+                        if (cfg->vcc.param[CISTPL_POWER_VNOM]/10000
+                                        != conf.Vcc)
+                                goto next_entry;
+                } else if (dflt.vcc.present & (1<<CISTPL_POWER_VNOM)) {
+                        if (dflt.vcc.param[CISTPL_POWER_VNOM]/10000
+                                        != conf.Vcc)
+                                goto next_entry;
+                }
+
+                if (cfg->vpp1.present & (1<<CISTPL_POWER_VNOM))
+                        link->conf.Vpp1 = link->conf.Vpp2 =
+                                cfg->vpp1.param[CISTPL_POWER_VNOM]/10000;
+                else if (dflt.vpp1.present & (1<<CISTPL_POWER_VNOM))
+                        link->conf.Vpp1 = link->conf.Vpp2 =
+                                dflt.vpp1.param[CISTPL_POWER_VNOM]/10000;
+
+                /* we need an interrupt */
+                if (cfg->irq.IRQInfo1 || dflt.irq.IRQInfo1)
+                        link->conf.Attributes |= CONF_ENABLE_IRQ;
+
+                /* IO window settings */
+                link->io.NumPorts1 = link->io.NumPorts2 = 0;
+                if ((cfg->io.nwin > 0) || (dflt.io.nwin > 0)) {
+                        cistpl_io_t *io = (cfg->io.nwin) ? &cfg->io : &dflt.io;
+
+                        link->io.Attributes1 = IO_DATA_PATH_WIDTH_8;
+                        link->io.IOAddrLines = io->flags & CISTPL_IO_LINES_MASK;
+                        link->io.BasePort1 = io->win[0].base;
+                        link->io.NumPorts1 = io->win[0].len;
+
+                        if (pcmcia_request_io(link->handle, &link->io) != 0)
+                                goto next_entry;
+                }
+                break;
+
+next_entry:
+                if (link->io.NumPorts1)
+                        pcmcia_release_io(link->handle, &link->io);
+                last_ret = pcmcia_get_next_tuple(handle, &tuple);
+        }
+
+        /* require an IRQ and two registers */
+        if (!link->io.NumPorts1 || link->io.NumPorts1 < 2)
+                goto cs_failed;
+        if (link->conf.Attributes & CONF_ENABLE_IRQ)
+                CS_CHECK(RequestIRQ,
+                        pcmcia_request_irq(link->handle, &link->irq));
+        else
+                goto cs_failed;
+
+        CS_CHECK(RequestConfiguration,
+                pcmcia_request_configuration(link->handle, &link->conf));
+
+        sprintf(dev->node.dev_name, driver_name);
+        dev->node.major = dev->node.minor = 0;
+        link->dev = &dev->node;
+
+        printk(KERN_INFO "%s: index 0x%02x: Vcc %d.%d",
+               dev->node.dev_name, link->conf.ConfigIndex,
+               link->conf.Vcc/10, link->conf.Vcc%10);
+        if (link->conf.Vpp1)
+                printk(", Vpp %d.%d", link->conf.Vpp1/10, link->conf.Vpp1%10);
+        printk(", irq %d", link->irq.AssignedIRQ);
+        printk(", io 0x%04x-0x%04x", link->io.BasePort1,
+               link->io.BasePort1+link->io.NumPorts1-1);
+        printk("\n");
+
+        link->state &= ~DEV_CONFIG_PENDING;
+
+        if (sl811_hc_init(parent, link->io.BasePort1, link->irq.AssignedIRQ)
+                        < 0) {
+cs_failed:
+                printk("sl811_cs_config failed\n");
+                cs_error(link->handle, last_fn, last_ret);
+                sl811_cs_release(link);
+                link->state &= ~DEV_CONFIG_PENDING;
+        }
+}
+
+static int
+sl811_cs_event(event_t event, int priority, event_callback_args_t *args)
+{
+        dev_link_t *link = args->client_data;
+
+        DBG(1, "sl811_cs_event(0x%06x)\n", event);
+
+        switch (event) {
+        case CS_EVENT_CARD_REMOVAL:
+                link->state &= ~DEV_PRESENT;
+                if (link->state & DEV_CONFIG)
+                        sl811_cs_release(link);
+                break;
+
+        case CS_EVENT_CARD_INSERTION:
+                link->state |= DEV_PRESENT | DEV_CONFIG_PENDING;
+                sl811_cs_config(link);
+                break;
+
+        case CS_EVENT_PM_SUSPEND:
+                link->state |= DEV_SUSPEND;
+                /* Fall through... */
+        case CS_EVENT_RESET_PHYSICAL:
+                if (link->state & DEV_CONFIG)
+                        pcmcia_release_configuration(link->handle);
+                break;
+
+        case CS_EVENT_PM_RESUME:
+                link->state &= ~DEV_SUSPEND;
+                /* Fall through... */
+        case CS_EVENT_CARD_RESET:
+                if (link->state & DEV_CONFIG)
+                        pcmcia_request_configuration(link->handle, &link->conf);
+                DBG(0, "reset sl811-hcd here?\n");
+                break;
+        }
+        return 0;
+}
+
+static dev_link_t *sl811_cs_attach(void)
+{
+        local_info_t *local;
+        dev_link_t *link;
+        client_reg_t client_reg;
+        int ret, i;
+
+        local = kmalloc(sizeof(local_info_t), GFP_KERNEL);
+        if (!local)
+                return NULL;
+        memset(local, 0, sizeof(local_info_t));
+        link = &local->link;
+        link->priv = local;
+
+        /* Initialize */
+        link->irq.Attributes = IRQ_TYPE_EXCLUSIVE;
+        link->irq.IRQInfo1 = IRQ_INFO2_VALID|IRQ_LEVEL_ID;
+        if (irq_list[0] == -1)
+                link->irq.IRQInfo2 = irq_mask;
+        else
+                for (i = 0; i < irq_list_count; i++)
+                        link->irq.IRQInfo2 |= 1 << irq_list[i];
+        link->irq.Handler = NULL;
+
+        link->conf.Attributes = 0;
+        link->conf.Vcc = 33;
+        link->conf.IntType = INT_MEMORY_AND_IO;
+
+        /* Register with Card Services */
+        link->next = dev_list;
+        dev_list = link;
+        client_reg.dev_info = (dev_info_t *) &driver_name;
+        client_reg.Attributes = INFO_IO_CLIENT | INFO_CARD_SHARE;
+        client_reg.EventMask =
+                CS_EVENT_CARD_INSERTION | CS_EVENT_CARD_REMOVAL |
+                CS_EVENT_RESET_PHYSICAL | CS_EVENT_CARD_RESET |
+                CS_EVENT_PM_SUSPEND | CS_EVENT_PM_RESUME;
+        client_reg.event_handler = &sl811_cs_event;
+        client_reg.Version = 0x0210;
+        client_reg.event_callback_args.client_data = link;
+        ret = pcmcia_register_client(&link->handle, &client_reg);
+        if (ret != CS_SUCCESS) {
+                cs_error(link->handle, RegisterClient, ret);
+                sl811_cs_detach(link);
+                return NULL;
+        }
+
+        return link;
+}
+
+static struct pcmcia_driver sl811_cs_driver = {
+        .owner          = THIS_MODULE,
+        .drv            = {
+                .name   = (char *)driver_name,
+        },
+        .attach         = sl811_cs_attach,
+        .detach         = sl811_cs_detach,
+};
+
+/*====================================================================*/
+
+static int __init init_sl811_cs(void)
+{
+        return pcmcia_register_driver(&sl811_cs_driver);
+}
+module_init(init_sl811_cs);
+
+static void __exit exit_sl811_cs(void)
+{
+        pcmcia_unregister_driver(&sl811_cs_driver);
+}
+module_exit(exit_sl811_cs);