- 根目录:
- drivers
- pcmcia
- bcm63xx_pcmcia.c
/*
* 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/slab.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 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 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 = bcm63xx_drv_pcmcia_remove,
.driver = {
.name = "bcm63xx_pcmcia",
.owner = THIS_MODULE,
},
};
#ifdef CONFIG_CARDBUS
static int 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 bcm63xx_cb_exit(struct pci_dev *dev)
{
platform_driver_unregister(&bcm63xx_pcmcia_driver);
bcm63xx_cb_dev = NULL;
}
static DEFINE_PCI_DEVICE_TABLE(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 = 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");