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/*

 *  tifm_7xx1.c - TI FlashMedia driver

 *

 *  Copyright (C) 2006 Alex Dubov <oakad@yahoo.com>

 *

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License version 2 as

 * published by the Free Software Foundation.

 *

 */

#include <linux/tifm.h>

#include <linux/dma-mapping.h>

#define DRIVER_NAME "tifm_7xx1"

#define DRIVER_VERSION "0.8"

#define TIFM_IRQ_ENABLE           0x80000000

#define TIFM_IRQ_SOCKMASK(x)      (x)

#define TIFM_IRQ_CARDMASK(x)      ((x) << 8)

#define TIFM_IRQ_FIFOMASK(x)      ((x) << 16)

#define TIFM_IRQ_SETALL           0xffffffff

static void tifm_7xx1_dummy_eject(struct tifm_adapter *fm,

                                  struct tifm_dev *sock)

{

}

static void tifm_7xx1_eject(struct tifm_adapter *fm, struct tifm_dev *sock)

{

        unsigned long flags;

        spin_lock_irqsave(&fm->lock, flags);

        fm->socket_change_set |= 1 << sock->socket_id;

        tifm_queue_work(&fm->media_switcher);

        spin_unlock_irqrestore(&fm->lock, flags);

}

static irqreturn_t tifm_7xx1_isr(int irq, void *dev_id)

{

        struct tifm_adapter *fm = dev_id;

        struct tifm_dev *sock;

        unsigned int irq_status, cnt;

        spin_lock(&fm->lock);

        irq_status = readl(fm->addr + FM_INTERRUPT_STATUS);

        if (irq_status == 0 || irq_status == (~0)) {

                spin_unlock(&fm->lock);

                return IRQ_NONE;

        }

        if (irq_status & TIFM_IRQ_ENABLE) {

                writel(TIFM_IRQ_ENABLE, fm->addr + FM_CLEAR_INTERRUPT_ENABLE);

                for (cnt = 0; cnt < fm->num_sockets; cnt++) {

                        sock = fm->sockets[cnt];

                        if (sock) {

                                if ((irq_status >> cnt) & TIFM_IRQ_FIFOMASK(1))

                                        sock->data_event(sock);

                                if ((irq_status >> cnt) & TIFM_IRQ_CARDMASK(1))

                                        sock->card_event(sock);

                        }

                }

                fm->socket_change_set |= irq_status

                                         & ((1 << fm->num_sockets) - 1);

        }

        writel(irq_status, fm->addr + FM_INTERRUPT_STATUS);

        if (fm->finish_me)

                complete_all(fm->finish_me);

        else if (!fm->socket_change_set)

                writel(TIFM_IRQ_ENABLE, fm->addr + FM_SET_INTERRUPT_ENABLE);

        else

                tifm_queue_work(&fm->media_switcher);

        spin_unlock(&fm->lock);

        return IRQ_HANDLED;

}

static unsigned char tifm_7xx1_toggle_sock_power(char __iomem *sock_addr)

{

        unsigned int s_state;

        int cnt;

        writel(0x0e00, sock_addr + SOCK_CONTROL);

        for (cnt = 16; cnt <= 256; cnt <<= 1) {

                if (!(TIFM_SOCK_STATE_POWERED

                      & readl(sock_addr + SOCK_PRESENT_STATE)))

                        break;

                msleep(cnt);

        }

        s_state = readl(sock_addr + SOCK_PRESENT_STATE);

        if (!(TIFM_SOCK_STATE_OCCUPIED & s_state))

                return 0;

        writel(readl(sock_addr + SOCK_CONTROL) | TIFM_CTRL_LED,

               sock_addr + SOCK_CONTROL);

        /* xd needs some extra time before power on */

        if (((readl(sock_addr + SOCK_PRESENT_STATE) >> 4) & 7)

            == TIFM_TYPE_XD)

                msleep(40);

        writel((s_state & TIFM_CTRL_POWER_MASK) | 0x0c00,

               sock_addr + SOCK_CONTROL);

        /* wait for power to stabilize */

        msleep(20);

        for (cnt = 16; cnt <= 256; cnt <<= 1) {

                if ((TIFM_SOCK_STATE_POWERED

                     & readl(sock_addr + SOCK_PRESENT_STATE)))

                        break;

                msleep(cnt);

        }

        writel(readl(sock_addr + SOCK_CONTROL) & (~TIFM_CTRL_LED),

               sock_addr + SOCK_CONTROL);

        return (readl(sock_addr + SOCK_PRESENT_STATE) >> 4) & 7;

}

inline static void tifm_7xx1_sock_power_off(char __iomem *sock_addr)

{

        writel((~TIFM_CTRL_POWER_MASK) & readl(sock_addr + SOCK_CONTROL),

               sock_addr + SOCK_CONTROL);

}

inline static char __iomem *

tifm_7xx1_sock_addr(char __iomem *base_addr, unsigned int sock_num)

{

        return base_addr + ((sock_num + 1) << 10);

}

static void tifm_7xx1_switch_media(struct work_struct *work)

{

        struct tifm_adapter *fm = container_of(work, struct tifm_adapter,

                                               media_switcher);

        struct tifm_dev *sock;

        char __iomem *sock_addr;

        unsigned long flags;

        unsigned char media_id;

        unsigned int socket_change_set, cnt;

        spin_lock_irqsave(&fm->lock, flags);

        socket_change_set = fm->socket_change_set;

        fm->socket_change_set = 0;

        dev_dbg(fm->cdev.dev, "checking media set %x\n",

                socket_change_set);

        if (!socket_change_set) {

                spin_unlock_irqrestore(&fm->lock, flags);

                return;

        }

        for (cnt = 0; cnt < fm->num_sockets; cnt++) {

                if (!(socket_change_set & (1 << cnt)))

                        continue;

                sock = fm->sockets[cnt];

                if (sock) {

                        printk(KERN_INFO

                               "%s : demand removing card from socket %u:%u\n",

                               fm->cdev.class_id, fm->id, cnt);

                        fm->sockets[cnt] = NULL;

                        sock_addr = sock->addr;

                        spin_unlock_irqrestore(&fm->lock, flags);

                        device_unregister(&sock->dev);

                        spin_lock_irqsave(&fm->lock, flags);

                        tifm_7xx1_sock_power_off(sock_addr);

                        writel(0x0e00, sock_addr + SOCK_CONTROL);

                }

                spin_unlock_irqrestore(&fm->lock, flags);

                media_id = tifm_7xx1_toggle_sock_power(

                                tifm_7xx1_sock_addr(fm->addr, cnt));

                // tifm_alloc_device will check if media_id is valid

                sock = tifm_alloc_device(fm, cnt, media_id);

                if (sock) {

                        sock->addr = tifm_7xx1_sock_addr(fm->addr, cnt);

                        if (!device_register(&sock->dev)) {

                                spin_lock_irqsave(&fm->lock, flags);

                                if (!fm->sockets[cnt]) {

                                        fm->sockets[cnt] = sock;

                                        sock = NULL;

                                }

                                spin_unlock_irqrestore(&fm->lock, flags);

                        }

                        if (sock)

                                tifm_free_device(&sock->dev);

                }

                spin_lock_irqsave(&fm->lock, flags);

        }

        writel(TIFM_IRQ_FIFOMASK(socket_change_set)

               | TIFM_IRQ_CARDMASK(socket_change_set),

               fm->addr + FM_CLEAR_INTERRUPT_ENABLE);

        writel(TIFM_IRQ_FIFOMASK(socket_change_set)

               | TIFM_IRQ_CARDMASK(socket_change_set),

               fm->addr + FM_SET_INTERRUPT_ENABLE);

        writel(TIFM_IRQ_ENABLE, fm->addr + FM_SET_INTERRUPT_ENABLE);

        spin_unlock_irqrestore(&fm->lock, flags);

}

#ifdef CONFIG_PM

static int tifm_7xx1_suspend(struct pci_dev *dev, pm_message_t state)

{

        struct tifm_adapter *fm = pci_get_drvdata(dev);

        int cnt;

        dev_dbg(&dev->dev, "suspending host\n");

        for (cnt = 0; cnt < fm->num_sockets; cnt++) {

                if (fm->sockets[cnt])

                        tifm_7xx1_sock_power_off(fm->sockets[cnt]->addr);

        }

        pci_save_state(dev);

        pci_enable_wake(dev, pci_choose_state(dev, state), 0);

        pci_disable_device(dev);

        pci_set_power_state(dev, pci_choose_state(dev, state));

        return 0;

}

static int tifm_7xx1_resume(struct pci_dev *dev)

{

        struct tifm_adapter *fm = pci_get_drvdata(dev);

        int rc;

        unsigned int good_sockets = 0, bad_sockets = 0;

        unsigned long flags;

        unsigned char new_ids[fm->num_sockets];

        DECLARE_COMPLETION_ONSTACK(finish_resume);

        pci_set_power_state(dev, PCI_D0);

        pci_restore_state(dev);

        rc = pci_enable_device(dev);

        if (rc)

                return rc;

        pci_set_master(dev);

        dev_dbg(&dev->dev, "resuming host\n");

        for (rc = 0; rc < fm->num_sockets; rc++)

                new_ids[rc] = tifm_7xx1_toggle_sock_power(

                                        tifm_7xx1_sock_addr(fm->addr, rc));

        spin_lock_irqsave(&fm->lock, flags);

        for (rc = 0; rc < fm->num_sockets; rc++) {

                if (fm->sockets[rc]) {

                        if (fm->sockets[rc]->type == new_ids[rc])

                                good_sockets |= 1 << rc;

                        else

                                bad_sockets |= 1 << rc;

                }

        }

        writel(TIFM_IRQ_ENABLE | TIFM_IRQ_SOCKMASK((1 << fm->num_sockets) - 1),

               fm->addr + FM_SET_INTERRUPT_ENABLE);

        dev_dbg(&dev->dev, "change sets on resume: good %x, bad %x\n",

                good_sockets, bad_sockets);

        fm->socket_change_set = 0;

        if (good_sockets) {

                fm->finish_me = &finish_resume;

                spin_unlock_irqrestore(&fm->lock, flags);

                rc = wait_for_completion_timeout(&finish_resume, HZ);

                dev_dbg(&dev->dev, "wait returned %d\n", rc);

                writel(TIFM_IRQ_FIFOMASK(good_sockets)

                       | TIFM_IRQ_CARDMASK(good_sockets),

                       fm->addr + FM_CLEAR_INTERRUPT_ENABLE);

                writel(TIFM_IRQ_FIFOMASK(good_sockets)

                       | TIFM_IRQ_CARDMASK(good_sockets),

                       fm->addr + FM_SET_INTERRUPT_ENABLE);

                spin_lock_irqsave(&fm->lock, flags);

                fm->finish_me = NULL;

                fm->socket_change_set ^= good_sockets & fm->socket_change_set;

        }

        fm->socket_change_set |= bad_sockets;

        if (fm->socket_change_set)

                tifm_queue_work(&fm->media_switcher);

        spin_unlock_irqrestore(&fm->lock, flags);

        writel(TIFM_IRQ_ENABLE,

               fm->addr + FM_SET_INTERRUPT_ENABLE);

        return 0;

}

#else

#define tifm_7xx1_suspend NULL

#define tifm_7xx1_resume NULL

#endif /* CONFIG_PM */

static int tifm_7xx1_probe(struct pci_dev *dev,

                           const struct pci_device_id *dev_id)

{

        struct tifm_adapter *fm;

        int pci_dev_busy = 0;

        int rc;

        rc = pci_set_dma_mask(dev, DMA_32BIT_MASK);

        if (rc)

                return rc;

        rc = pci_enable_device(dev);

        if (rc)

                return rc;

        pci_set_master(dev);

        rc = pci_request_regions(dev, DRIVER_NAME);

        if (rc) {

                pci_dev_busy = 1;

                goto err_out;

        }

        pci_intx(dev, 1);

        fm = tifm_alloc_adapter(dev->device == PCI_DEVICE_ID_TI_XX21_XX11_FM

                                ? 4 : 2, &dev->dev);

        if (!fm) {

                rc = -ENOMEM;

                goto err_out_int;

        }

        INIT_WORK(&fm->media_switcher, tifm_7xx1_switch_media);

        fm->eject = tifm_7xx1_eject;

        pci_set_drvdata(dev, fm);

        fm->addr = ioremap(pci_resource_start(dev, 0),

                           pci_resource_len(dev, 0));

        if (!fm->addr)

                goto err_out_free;

        rc = request_irq(dev->irq, tifm_7xx1_isr, IRQF_SHARED, DRIVER_NAME, fm);

        if (rc)

                goto err_out_unmap;

        rc = tifm_add_adapter(fm);

        if (rc)

                goto err_out_irq;

        writel(TIFM_IRQ_ENABLE | TIFM_IRQ_SOCKMASK((1 << fm->num_sockets) - 1),

               fm->addr + FM_SET_INTERRUPT_ENABLE);

        return 0;

err_out_irq:

        free_irq(dev->irq, fm);

err_out_unmap:

        iounmap(fm->addr);

err_out_free:

        pci_set_drvdata(dev, NULL);

        tifm_free_adapter(fm);

err_out_int:

        pci_intx(dev, 0);

        pci_release_regions(dev);

err_out:

        if (!pci_dev_busy)

                pci_disable_device(dev);

        return rc;

}

static void tifm_7xx1_remove(struct pci_dev *dev)

{

        struct tifm_adapter *fm = pci_get_drvdata(dev);

        int cnt;

        fm->eject = tifm_7xx1_dummy_eject;

        writel(TIFM_IRQ_SETALL, fm->addr + FM_CLEAR_INTERRUPT_ENABLE);

        mmiowb();

        free_irq(dev->irq, fm);

        tifm_remove_adapter(fm);

        for (cnt = 0; cnt < fm->num_sockets; cnt++)

                tifm_7xx1_sock_power_off(tifm_7xx1_sock_addr(fm->addr, cnt));

        pci_set_drvdata(dev, NULL);

        iounmap(fm->addr);

        pci_intx(dev, 0);

        pci_release_regions(dev);

        pci_disable_device(dev);

        tifm_free_adapter(fm);

}

static struct pci_device_id tifm_7xx1_pci_tbl [] = {

        { PCI_VENDOR_ID_TI, PCI_DEVICE_ID_TI_XX21_XX11_FM, PCI_ANY_ID,

          PCI_ANY_ID, 0, 0, 0 }, /* xx21 - the one I have */

        { PCI_VENDOR_ID_TI, PCI_DEVICE_ID_TI_XX12_FM, PCI_ANY_ID,

          PCI_ANY_ID, 0, 0, 0 },

        { PCI_VENDOR_ID_TI, PCI_DEVICE_ID_TI_XX20_FM, PCI_ANY_ID,

          PCI_ANY_ID, 0, 0, 0 },

        { }

};

static struct pci_driver tifm_7xx1_driver = {

        .name = DRIVER_NAME,

        .id_table = tifm_7xx1_pci_tbl,

        .probe = tifm_7xx1_probe,

        .remove = tifm_7xx1_remove,

        .suspend = tifm_7xx1_suspend,

        .resume = tifm_7xx1_resume,

};

static int __init tifm_7xx1_init(void)

{

        return pci_register_driver(&tifm_7xx1_driver);

}

static void __exit tifm_7xx1_exit(void)

{

        pci_unregister_driver(&tifm_7xx1_driver);

}

MODULE_AUTHOR("Alex Dubov");

MODULE_DESCRIPTION("TI FlashMedia host driver");

MODULE_LICENSE("GPL");

MODULE_DEVICE_TABLE(pci, tifm_7xx1_pci_tbl);

MODULE_VERSION(DRIVER_VERSION);

module_init(tifm_7xx1_init);

module_exit(tifm_7xx1_exit);