MIPS: BCM63xx: Add PCMCIA & Cardbus support.

Signed-off-by: Maxime Bizon <mbizon@freebox.fr>
Reviewed-by: Wolfram Sang <w.sang@pengutronix.de>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

1 files changed, 536 insertions, 0 deletions

diff --git a/drivers/pcmcia/bcm63xx_pcmcia.c b/drivers/pcmcia/bcm63xx_pcmcia.c
new file mode 100644
index 000000000000..bc88a3b19bb3
--- /dev/null
+++ b/drivers/pcmcia/bcm63xx_pcmcia.c
@@ -0,0 +1,536 @@
+/*
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * Copyright (C) 2008 Maxime Bizon <mbizon@freebox.fr>
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/ioport.h>
+#include <linux/timer.h>
+#include <linux/platform_device.h>
+#include <linux/delay.h>
+#include <linux/pci.h>
+#include <linux/gpio.h>
+
+#include <bcm63xx_regs.h>
+#include <bcm63xx_io.h>
+#include "bcm63xx_pcmcia.h"
+
+#define PFX     "bcm63xx_pcmcia: "
+
+#ifdef CONFIG_CARDBUS
+/* if cardbus is used, platform device needs reference to actual pci
+ * device */
+static struct pci_dev *bcm63xx_cb_dev;
+#endif
+
+/*
+ * read/write helper for pcmcia regs
+ */
+static inline u32 pcmcia_readl(struct bcm63xx_pcmcia_socket *skt, u32 off)
+{
+        return bcm_readl(skt->base + off);
+}
+
+static inline void pcmcia_writel(struct bcm63xx_pcmcia_socket *skt,
+                                 u32 val, u32 off)
+{
+        bcm_writel(val, skt->base + off);
+}
+
+/*
+ * This callback should (re-)initialise the socket, turn on status
+ * interrupts and PCMCIA bus, and wait for power to stabilise so that
+ * the card status signals report correctly.
+ *
+ * Hardware cannot do that.
+ */
+static int bcm63xx_pcmcia_sock_init(struct pcmcia_socket *sock)
+{
+        return 0;
+}
+
+/*
+ * This callback should remove power on the socket, disable IRQs from
+ * the card, turn off status interrupts, and disable the PCMCIA bus.
+ *
+ * Hardware cannot do that.
+ */
+static int bcm63xx_pcmcia_suspend(struct pcmcia_socket *sock)
+{
+        return 0;
+}
+
+/*
+ * Implements the set_socket() operation for the in-kernel PCMCIA
+ * service (formerly SS_SetSocket in Card Services). We more or
+ * less punt all of this work and let the kernel handle the details
+ * of power configuration, reset, &c. We also record the value of
+ * `state' in order to regurgitate it to the PCMCIA core later.
+ */
+static int bcm63xx_pcmcia_set_socket(struct pcmcia_socket *sock,
+                                     socket_state_t *state)
+{
+        struct bcm63xx_pcmcia_socket *skt;
+        unsigned long flags;
+        u32 val;
+
+        skt = sock->driver_data;
+
+        spin_lock_irqsave(&skt->lock, flags);
+
+        /* note: hardware cannot control socket power, so we will
+         * always report SS_POWERON */
+
+        /* apply socket reset */
+        val = pcmcia_readl(skt, PCMCIA_C1_REG);
+        if (state->flags & SS_RESET)
+                val |= PCMCIA_C1_RESET_MASK;
+        else
+                val &= ~PCMCIA_C1_RESET_MASK;
+
+        /* reverse reset logic for cardbus card */
+        if (skt->card_detected && (skt->card_type & CARD_CARDBUS))
+                val ^= PCMCIA_C1_RESET_MASK;
+
+        pcmcia_writel(skt, val, PCMCIA_C1_REG);
+
+        /* keep requested state for event reporting */
+        skt->requested_state = *state;
+
+        spin_unlock_irqrestore(&skt->lock, flags);
+
+        return 0;
+}
+
+/*
+ * identity cardtype from VS[12] input, CD[12] input while only VS2 is
+ * floating, and CD[12] input while only VS1 is floating
+ */
+enum {
+        IN_VS1 = (1 << 0),
+        IN_VS2 = (1 << 1),
+        IN_CD1_VS2H = (1 << 2),
+        IN_CD2_VS2H = (1 << 3),
+        IN_CD1_VS1H = (1 << 4),
+        IN_CD2_VS1H = (1 << 5),
+};
+
+static const u8 vscd_to_cardtype[] = {
+
+        /* VS1 float, VS2 float */
+        [IN_VS1 | IN_VS2] = (CARD_PCCARD | CARD_5V),
+
+        /* VS1 grounded, VS2 float */
+        [IN_VS2] = (CARD_PCCARD | CARD_5V | CARD_3V),
+
+        /* VS1 grounded, VS2 grounded */
+        [0] = (CARD_PCCARD | CARD_5V | CARD_3V | CARD_XV),
+
+        /* VS1 tied to CD1, VS2 float */
+        [IN_VS1 | IN_VS2 | IN_CD1_VS1H] = (CARD_CARDBUS | CARD_3V),
+
+        /* VS1 grounded, VS2 tied to CD2 */
+        [IN_VS2 | IN_CD2_VS2H] = (CARD_CARDBUS | CARD_3V | CARD_XV),
+
+        /* VS1 tied to CD2, VS2 grounded */
+        [IN_VS1 | IN_CD2_VS1H] = (CARD_CARDBUS | CARD_3V | CARD_XV | CARD_YV),
+
+        /* VS1 float, VS2 grounded */
+        [IN_VS1] = (CARD_PCCARD | CARD_XV),
+
+        /* VS1 float, VS2 tied to CD2 */
+        [IN_VS1 | IN_VS2 | IN_CD2_VS2H] = (CARD_CARDBUS | CARD_3V),
+
+        /* VS1 float, VS2 tied to CD1 */
+        [IN_VS1 | IN_VS2 | IN_CD1_VS2H] = (CARD_CARDBUS | CARD_XV | CARD_YV),
+
+        /* VS1 tied to CD2, VS2 float */
+        [IN_VS1 | IN_VS2 | IN_CD2_VS1H] = (CARD_CARDBUS | CARD_YV),
+
+        /* VS2 grounded, VS1 is tied to CD1, CD2 is grounded */
+        [IN_VS1 | IN_CD1_VS1H] = 0, /* ignore cardbay */
+};
+
+/*
+ * poll hardware to check card insertion status
+ */
+static unsigned int __get_socket_status(struct bcm63xx_pcmcia_socket *skt)
+{
+        unsigned int stat;
+        u32 val;
+
+        stat = 0;
+
+        /* check CD for card presence */
+        val = pcmcia_readl(skt, PCMCIA_C1_REG);
+
+        if (!(val & PCMCIA_C1_CD1_MASK) && !(val & PCMCIA_C1_CD2_MASK))
+                stat |= SS_DETECT;
+
+        /* if new insertion, detect cardtype */
+        if ((stat & SS_DETECT) && !skt->card_detected) {
+                unsigned int stat = 0;
+
+                /* float VS1, float VS2 */
+                val |= PCMCIA_C1_VS1OE_MASK;
+                val |= PCMCIA_C1_VS2OE_MASK;
+                pcmcia_writel(skt, val, PCMCIA_C1_REG);
+
+                /* wait for output to stabilize and read VS[12] */
+                udelay(10);
+                val = pcmcia_readl(skt, PCMCIA_C1_REG);
+                stat |= (val & PCMCIA_C1_VS1_MASK) ? IN_VS1 : 0;
+                stat |= (val & PCMCIA_C1_VS2_MASK) ? IN_VS2 : 0;
+
+                /* drive VS1 low, float VS2 */
+                val &= ~PCMCIA_C1_VS1OE_MASK;
+                val |= PCMCIA_C1_VS2OE_MASK;
+                pcmcia_writel(skt, val, PCMCIA_C1_REG);
+
+                /* wait for output to stabilize and read CD[12] */
+                udelay(10);
+                val = pcmcia_readl(skt, PCMCIA_C1_REG);
+                stat |= (val & PCMCIA_C1_CD1_MASK) ? IN_CD1_VS2H : 0;
+                stat |= (val & PCMCIA_C1_CD2_MASK) ? IN_CD2_VS2H : 0;
+
+                /* float VS1, drive VS2 low */
+                val |= PCMCIA_C1_VS1OE_MASK;
+                val &= ~PCMCIA_C1_VS2OE_MASK;
+                pcmcia_writel(skt, val, PCMCIA_C1_REG);
+
+                /* wait for output to stabilize and read CD[12] */
+                udelay(10);
+                val = pcmcia_readl(skt, PCMCIA_C1_REG);
+                stat |= (val & PCMCIA_C1_CD1_MASK) ? IN_CD1_VS1H : 0;
+                stat |= (val & PCMCIA_C1_CD2_MASK) ? IN_CD2_VS1H : 0;
+
+                /* guess cardtype from all this */
+                skt->card_type = vscd_to_cardtype[stat];
+                if (!skt->card_type)
+                        dev_err(&skt->socket.dev, "unsupported card type\n");
+
+                /* drive both VS pin to 0 again */
+                val &= ~(PCMCIA_C1_VS1OE_MASK | PCMCIA_C1_VS2OE_MASK);
+
+                /* enable correct logic */
+                val &= ~(PCMCIA_C1_EN_PCMCIA_MASK | PCMCIA_C1_EN_CARDBUS_MASK);
+                if (skt->card_type & CARD_PCCARD)
+                        val |= PCMCIA_C1_EN_PCMCIA_MASK;
+                else
+                        val |= PCMCIA_C1_EN_CARDBUS_MASK;
+
+                pcmcia_writel(skt, val, PCMCIA_C1_REG);
+        }
+        skt->card_detected = (stat & SS_DETECT) ? 1 : 0;
+
+        /* report card type/voltage */
+        if (skt->card_type & CARD_CARDBUS)
+                stat |= SS_CARDBUS;
+        if (skt->card_type & CARD_3V)
+                stat |= SS_3VCARD;
+        if (skt->card_type & CARD_XV)
+                stat |= SS_XVCARD;
+        stat |= SS_POWERON;
+
+        if (gpio_get_value(skt->pd->ready_gpio))
+                stat |= SS_READY;
+
+        return stat;
+}
+
+/*
+ * core request to get current socket status
+ */
+static int bcm63xx_pcmcia_get_status(struct pcmcia_socket *sock,
+                                     unsigned int *status)
+{
+        struct bcm63xx_pcmcia_socket *skt;
+
+        skt = sock->driver_data;
+
+        spin_lock_bh(&skt->lock);
+        *status = __get_socket_status(skt);
+        spin_unlock_bh(&skt->lock);
+
+        return 0;
+}
+
+/*
+ * socket polling timer callback
+ */
+static void bcm63xx_pcmcia_poll(unsigned long data)
+{
+        struct bcm63xx_pcmcia_socket *skt;
+        unsigned int stat, events;
+
+        skt = (struct bcm63xx_pcmcia_socket *)data;
+
+        spin_lock_bh(&skt->lock);
+
+        stat = __get_socket_status(skt);
+
+        /* keep only changed bits, and mask with required one from the
+         * core */
+        events = (stat ^ skt->old_status) & skt->requested_state.csc_mask;
+        skt->old_status = stat;
+        spin_unlock_bh(&skt->lock);
+
+        if (events)
+                pcmcia_parse_events(&skt->socket, events);
+
+        mod_timer(&skt->timer,
+                  jiffies + msecs_to_jiffies(BCM63XX_PCMCIA_POLL_RATE));
+}
+
+static int bcm63xx_pcmcia_set_io_map(struct pcmcia_socket *sock,
+                                     struct pccard_io_map *map)
+{
+        /* this doesn't seem to be called by pcmcia layer if static
+         * mapping is used */
+        return 0;
+}
+
+static int bcm63xx_pcmcia_set_mem_map(struct pcmcia_socket *sock,
+                                      struct pccard_mem_map *map)
+{
+        struct bcm63xx_pcmcia_socket *skt;
+        struct resource *res;
+
+        skt = sock->driver_data;
+        if (map->flags & MAP_ATTRIB)
+                res = skt->attr_res;
+        else
+                res = skt->common_res;
+
+        map->static_start = res->start + map->card_start;
+        return 0;
+}
+
+static struct pccard_operations bcm63xx_pcmcia_operations = {
+        .init                   = bcm63xx_pcmcia_sock_init,
+        .suspend                = bcm63xx_pcmcia_suspend,
+        .get_status             = bcm63xx_pcmcia_get_status,
+        .set_socket             = bcm63xx_pcmcia_set_socket,
+        .set_io_map             = bcm63xx_pcmcia_set_io_map,
+        .set_mem_map            = bcm63xx_pcmcia_set_mem_map,
+};
+
+/*
+ * register pcmcia socket to core
+ */
+static int __devinit bcm63xx_drv_pcmcia_probe(struct platform_device *pdev)
+{
+        struct bcm63xx_pcmcia_socket *skt;
+        struct pcmcia_socket *sock;
+        struct resource *res, *irq_res;
+        unsigned int regmem_size = 0, iomem_size = 0;
+        u32 val;
+        int ret;
+
+        skt = kzalloc(sizeof(*skt), GFP_KERNEL);
+        if (!skt)
+                return -ENOMEM;
+        spin_lock_init(&skt->lock);
+        sock = &skt->socket;
+        sock->driver_data = skt;
+
+        /* make sure we have all resources we need */
+        skt->common_res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
+        skt->attr_res = platform_get_resource(pdev, IORESOURCE_MEM, 2);
+        irq_res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
+        skt->pd = pdev->dev.platform_data;
+        if (!skt->common_res || !skt->attr_res || !irq_res || !skt->pd) {
+                ret = -EINVAL;
+                goto err;
+        }
+
+        /* remap pcmcia registers */
+        res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+        regmem_size = resource_size(res);
+        if (!request_mem_region(res->start, regmem_size, "bcm63xx_pcmcia")) {
+                ret = -EINVAL;
+                goto err;
+        }
+        skt->reg_res = res;
+
+        skt->base = ioremap(res->start, regmem_size);
+        if (!skt->base) {
+                ret = -ENOMEM;
+                goto err;
+        }
+
+        /* remap io registers */
+        res = platform_get_resource(pdev, IORESOURCE_MEM, 3);
+        iomem_size = resource_size(res);
+        skt->io_base = ioremap(res->start, iomem_size);
+        if (!skt->io_base) {
+                ret = -ENOMEM;
+                goto err;
+        }
+
+        /* resources are static */
+        sock->resource_ops = &pccard_static_ops;
+        sock->ops = &bcm63xx_pcmcia_operations;
+        sock->owner = THIS_MODULE;
+        sock->dev.parent = &pdev->dev;
+        sock->features = SS_CAP_STATIC_MAP | SS_CAP_PCCARD;
+        sock->io_offset = (unsigned long)skt->io_base;
+        sock->pci_irq = irq_res->start;
+
+#ifdef CONFIG_CARDBUS
+        sock->cb_dev = bcm63xx_cb_dev;
+        if (bcm63xx_cb_dev)
+                sock->features |= SS_CAP_CARDBUS;
+#endif
+
+        /* assume common & attribute memory have the same size */
+        sock->map_size = resource_size(skt->common_res);
+
+        /* initialize polling timer */
+        setup_timer(&skt->timer, bcm63xx_pcmcia_poll, (unsigned long)skt);
+
+        /* initialize  pcmcia  control register,  drive  VS[12] to  0,
+         * leave CB IDSEL to the old  value since it is set by the PCI
+         * layer */
+        val = pcmcia_readl(skt, PCMCIA_C1_REG);
+        val &= PCMCIA_C1_CBIDSEL_MASK;
+        val |= PCMCIA_C1_EN_PCMCIA_GPIO_MASK;
+        pcmcia_writel(skt, val, PCMCIA_C1_REG);
+
+        /*
+         * Hardware has only one set of timings registers, not one for
+         * each memory access type, so we configure them for the
+         * slowest one: attribute memory.
+         */
+        val = PCMCIA_C2_DATA16_MASK;
+        val |= 10 << PCMCIA_C2_RWCOUNT_SHIFT;
+        val |= 6 << PCMCIA_C2_INACTIVE_SHIFT;
+        val |= 3 << PCMCIA_C2_SETUP_SHIFT;
+        val |= 3 << PCMCIA_C2_HOLD_SHIFT;
+        pcmcia_writel(skt, val, PCMCIA_C2_REG);
+
+        ret = pcmcia_register_socket(sock);
+        if (ret)
+                goto err;
+
+        /* start polling socket */
+        mod_timer(&skt->timer,
+                  jiffies + msecs_to_jiffies(BCM63XX_PCMCIA_POLL_RATE));
+
+        platform_set_drvdata(pdev, skt);
+        return 0;
+
+err:
+        if (skt->io_base)
+                iounmap(skt->io_base);
+        if (skt->base)
+                iounmap(skt->base);
+        if (skt->reg_res)
+                release_mem_region(skt->reg_res->start, regmem_size);
+        kfree(skt);
+        return ret;
+}
+
+static int __devexit bcm63xx_drv_pcmcia_remove(struct platform_device *pdev)
+{
+        struct bcm63xx_pcmcia_socket *skt;
+        struct resource *res;
+
+        skt = platform_get_drvdata(pdev);
+        del_timer_sync(&skt->timer);
+        iounmap(skt->base);
+        iounmap(skt->io_base);
+        res = skt->reg_res;
+        release_mem_region(res->start, resource_size(res));
+        kfree(skt);
+        return 0;
+}
+
+struct platform_driver bcm63xx_pcmcia_driver = {
+        .probe  = bcm63xx_drv_pcmcia_probe,
+        .remove = __devexit_p(bcm63xx_drv_pcmcia_remove),
+        .driver = {
+                .name   = "bcm63xx_pcmcia",
+                .owner  = THIS_MODULE,
+        },
+};
+
+#ifdef CONFIG_CARDBUS
+static int __devinit bcm63xx_cb_probe(struct pci_dev *dev,
+                                      const struct pci_device_id *id)
+{
+        /* keep pci device */
+        bcm63xx_cb_dev = dev;
+        return platform_driver_register(&bcm63xx_pcmcia_driver);
+}
+
+static void __devexit bcm63xx_cb_exit(struct pci_dev *dev)
+{
+        platform_driver_unregister(&bcm63xx_pcmcia_driver);
+        bcm63xx_cb_dev = NULL;
+}
+
+static struct pci_device_id bcm63xx_cb_table[] = {
+        {
+                .vendor         = PCI_VENDOR_ID_BROADCOM,
+                .device         = BCM6348_CPU_ID,
+                .subvendor      = PCI_VENDOR_ID_BROADCOM,
+                .subdevice      = PCI_ANY_ID,
+                .class          = PCI_CLASS_BRIDGE_CARDBUS << 8,
+                .class_mask     = ~0,
+        },
+
+        {
+                .vendor         = PCI_VENDOR_ID_BROADCOM,
+                .device         = BCM6358_CPU_ID,
+                .subvendor      = PCI_VENDOR_ID_BROADCOM,
+                .subdevice      = PCI_ANY_ID,
+                .class          = PCI_CLASS_BRIDGE_CARDBUS << 8,
+                .class_mask     = ~0,
+        },
+
+        { },
+};
+
+MODULE_DEVICE_TABLE(pci, bcm63xx_cb_table);
+
+static struct pci_driver bcm63xx_cardbus_driver = {
+        .name           = "bcm63xx_cardbus",
+        .id_table       = bcm63xx_cb_table,
+        .probe          = bcm63xx_cb_probe,
+        .remove         = __devexit_p(bcm63xx_cb_exit),
+};
+#endif
+
+/*
+ * if cardbus support is enabled, register our platform device after
+ * our fake cardbus bridge has been registered
+ */
+static int __init bcm63xx_pcmcia_init(void)
+{
+#ifdef CONFIG_CARDBUS
+        return pci_register_driver(&bcm63xx_cardbus_driver);
+#else
+        return platform_driver_register(&bcm63xx_pcmcia_driver);
+#endif
+}
+
+static void __exit bcm63xx_pcmcia_exit(void)
+{
+#ifdef CONFIG_CARDBUS
+        return pci_unregister_driver(&bcm63xx_cardbus_driver);
+#else
+        platform_driver_unregister(&bcm63xx_pcmcia_driver);
+#endif
+}
+
+module_init(bcm63xx_pcmcia_init);
+module_exit(bcm63xx_pcmcia_exit);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Maxime Bizon <mbizon@freebox.fr>");
+MODULE_DESCRIPTION("Linux PCMCIA Card Services: bcm63xx Socket Controller");