linux/drivers/pcmcia/db1xxx_ss.c

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/*
* PCMCIA socket code for the Alchemy Db1xxx/Pb1xxx boards.
*
* Copyright (c) 2009 Manuel Lauss <manuel.lauss@gmail.com>
*
*/
/* This is a fairly generic PCMCIA socket driver suitable for the
* following Alchemy Development boards:
* Db1000, Db/Pb1500, Db/Pb1100, Db/Pb1550, Db/Pb1200, Db1300
*
* The Db1000 is used as a reference: Per-socket card-, carddetect- and
* statuschange IRQs connected to SoC GPIOs, control and status register
* bits arranged in per-socket groups in an external PLD. All boards
* listed here use this layout, including bit positions and meanings.
* Of course there are exceptions in later boards:
*
* - Pb1100/Pb1500: single socket only; voltage key bits VS are
* at STATUS[5:4] (instead of STATUS[1:0]).
* - Au1200-based: additional card-eject irqs, irqs not gpios!
* - Db1300: Db1200-like, no pwr ctrl, single socket (#1).
*/
#include <linux/delay.h>
#include <linux/gpio.h>
#include <linux/interrupt.h>
#include <linux/pm.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/resource.h>
include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h percpu.h is included by sched.h and module.h and thus ends up being included when building most .c files. percpu.h includes slab.h which in turn includes gfp.h making everything defined by the two files universally available and complicating inclusion dependencies. percpu.h -> slab.h dependency is about to be removed. Prepare for this change by updating users of gfp and slab facilities include those headers directly instead of assuming availability. As this conversion needs to touch large number of source files, the following script is used as the basis of conversion. http://userweb.kernel.org/~tj/misc/slabh-sweep.py The script does the followings. * Scan files for gfp and slab usages and update includes such that only the necessary includes are there. ie. if only gfp is used, gfp.h, if slab is used, slab.h. * When the script inserts a new include, it looks at the include blocks and try to put the new include such that its order conforms to its surrounding. It's put in the include block which contains core kernel includes, in the same order that the rest are ordered - alphabetical, Christmas tree, rev-Xmas-tree or at the end if there doesn't seem to be any matching order. * If the script can't find a place to put a new include (mostly because the file doesn't have fitting include block), it prints out an error message indicating which .h file needs to be added to the file. The conversion was done in the following steps. 1. The initial automatic conversion of all .c files updated slightly over 4000 files, deleting around 700 includes and adding ~480 gfp.h and ~3000 slab.h inclusions. The script emitted errors for ~400 files. 2. Each error was manually checked. Some didn't need the inclusion, some needed manual addition while adding it to implementation .h or embedding .c file was more appropriate for others. This step added inclusions to around 150 files. 3. The script was run again and the output was compared to the edits from #2 to make sure no file was left behind. 4. Several build tests were done and a couple of problems were fixed. e.g. lib/decompress_*.c used malloc/free() wrappers around slab APIs requiring slab.h to be added manually. 5. The script was run on all .h files but without automatically editing them as sprinkling gfp.h and slab.h inclusions around .h files could easily lead to inclusion dependency hell. Most gfp.h inclusion directives were ignored as stuff from gfp.h was usually wildly available and often used in preprocessor macros. Each slab.h inclusion directive was examined and added manually as necessary. 6. percpu.h was updated not to include slab.h. 7. Build test were done on the following configurations and failures were fixed. CONFIG_GCOV_KERNEL was turned off for all tests (as my distributed build env didn't work with gcov compiles) and a few more options had to be turned off depending on archs to make things build (like ipr on powerpc/64 which failed due to missing writeq). * x86 and x86_64 UP and SMP allmodconfig and a custom test config. * powerpc and powerpc64 SMP allmodconfig * sparc and sparc64 SMP allmodconfig * ia64 SMP allmodconfig * s390 SMP allmodconfig * alpha SMP allmodconfig * um on x86_64 SMP allmodconfig 8. percpu.h modifications were reverted so that it could be applied as a separate patch and serve as bisection point. Given the fact that I had only a couple of failures from tests on step 6, I'm fairly confident about the coverage of this conversion patch. If there is a breakage, it's likely to be something in one of the arch headers which should be easily discoverable easily on most builds of the specific arch. Signed-off-by: Tejun Heo <tj@kernel.org> Guess-its-ok-by: Christoph Lameter <cl@linux-foundation.org> Cc: Ingo Molnar <mingo@redhat.com> Cc: Lee Schermerhorn <Lee.Schermerhorn@hp.com>
2010-03-24 08:04:11 +00:00
#include <linux/slab.h>
#include <linux/spinlock.h>
#include <pcmcia/ss.h>
#include <asm/mach-au1x00/au1000.h>
#include <asm/mach-db1x00/bcsr.h>
#define MEM_MAP_SIZE 0x400000
#define IO_MAP_SIZE 0x1000
struct db1x_pcmcia_sock {
struct pcmcia_socket socket;
int nr; /* socket number */
void *virt_io;
phys_addr_t phys_io;
phys_addr_t phys_attr;
phys_addr_t phys_mem;
/* previous flags for set_socket() */
unsigned int old_flags;
/* interrupt sources: linux irq numbers! */
int insert_irq; /* default carddetect irq */
int stschg_irq; /* card-status-change irq */
int card_irq; /* card irq */
int eject_irq; /* db1200/pb1200 have these */
#define BOARD_TYPE_DEFAULT 0 /* most boards */
#define BOARD_TYPE_DB1200 1 /* IRQs aren't gpios */
#define BOARD_TYPE_PB1100 2 /* VS bits slightly different */
#define BOARD_TYPE_DB1300 3 /* no power control */
int board_type;
};
#define to_db1x_socket(x) container_of(x, struct db1x_pcmcia_sock, socket)
static int db1300_card_inserted(struct db1x_pcmcia_sock *sock)
{
return bcsr_read(BCSR_SIGSTAT) & (1 << 8);
}
/* DB/PB1200: check CPLD SIGSTATUS register bit 10/12 */
static int db1200_card_inserted(struct db1x_pcmcia_sock *sock)
{
unsigned short sigstat;
sigstat = bcsr_read(BCSR_SIGSTAT);
return sigstat & 1 << (8 + 2 * sock->nr);
}
/* carddetect gpio: low-active */
static int db1000_card_inserted(struct db1x_pcmcia_sock *sock)
{
return !gpio_get_value(irq_to_gpio(sock->insert_irq));
}
static int db1x_card_inserted(struct db1x_pcmcia_sock *sock)
{
switch (sock->board_type) {
case BOARD_TYPE_DB1200:
return db1200_card_inserted(sock);
case BOARD_TYPE_DB1300:
return db1300_card_inserted(sock);
default:
return db1000_card_inserted(sock);
}
}
/* STSCHG tends to bounce heavily when cards are inserted/ejected.
* To avoid this, the interrupt is normally disabled and only enabled
* after reset to a card has been de-asserted.
*/
static inline void set_stschg(struct db1x_pcmcia_sock *sock, int en)
{
if (sock->stschg_irq != -1) {
if (en)
enable_irq(sock->stschg_irq);
else
disable_irq(sock->stschg_irq);
}
}
static irqreturn_t db1000_pcmcia_cdirq(int irq, void *data)
{
struct db1x_pcmcia_sock *sock = data;
pcmcia_parse_events(&sock->socket, SS_DETECT);
return IRQ_HANDLED;
}
static irqreturn_t db1000_pcmcia_stschgirq(int irq, void *data)
{
struct db1x_pcmcia_sock *sock = data;
pcmcia_parse_events(&sock->socket, SS_STSCHG);
return IRQ_HANDLED;
}
static irqreturn_t db1200_pcmcia_cdirq(int irq, void *data)
{
struct db1x_pcmcia_sock *sock = data;
/* Db/Pb1200 have separate per-socket insertion and ejection
* interrupts which stay asserted as long as the card is
* inserted/missing. The one which caused us to be called
* needs to be disabled and the other one enabled.
*/
if (irq == sock->insert_irq) {
disable_irq_nosync(sock->insert_irq);
enable_irq(sock->eject_irq);
} else {
disable_irq_nosync(sock->eject_irq);
enable_irq(sock->insert_irq);
}
pcmcia_parse_events(&sock->socket, SS_DETECT);
return IRQ_HANDLED;
}
static int db1x_pcmcia_setup_irqs(struct db1x_pcmcia_sock *sock)
{
int ret;
if (sock->stschg_irq != -1) {
ret = request_irq(sock->stschg_irq, db1000_pcmcia_stschgirq,
0, "pcmcia_stschg", sock);
if (ret)
return ret;
}
/* Db/Pb1200 have separate per-socket insertion and ejection
* interrupts, which should show edge behaviour but don't.
* So interrupts are disabled until both insertion and
* ejection handler have been registered and the currently
* active one disabled.
*/
if ((sock->board_type == BOARD_TYPE_DB1200) ||
(sock->board_type == BOARD_TYPE_DB1300)) {
ret = request_irq(sock->insert_irq, db1200_pcmcia_cdirq,
0, "pcmcia_insert", sock);
if (ret)
goto out1;
ret = request_irq(sock->eject_irq, db1200_pcmcia_cdirq,
0, "pcmcia_eject", sock);
if (ret) {
free_irq(sock->insert_irq, sock);
goto out1;
}
/* enable the currently silent one */
if (db1x_card_inserted(sock))
enable_irq(sock->eject_irq);
else
enable_irq(sock->insert_irq);
} else {
/* all other (older) Db1x00 boards use a GPIO to show
* card detection status: use both-edge triggers.
*/
irq_set_irq_type(sock->insert_irq, IRQ_TYPE_EDGE_BOTH);
ret = request_irq(sock->insert_irq, db1000_pcmcia_cdirq,
0, "pcmcia_carddetect", sock);
if (ret)
goto out1;
}
return 0; /* all done */
out1:
if (sock->stschg_irq != -1)
free_irq(sock->stschg_irq, sock);
return ret;
}
static void db1x_pcmcia_free_irqs(struct db1x_pcmcia_sock *sock)
{
if (sock->stschg_irq != -1)
free_irq(sock->stschg_irq, sock);
free_irq(sock->insert_irq, sock);
if (sock->eject_irq != -1)
free_irq(sock->eject_irq, sock);
}
/*
* configure a PCMCIA socket on the Db1x00 series of boards (and
* compatibles).
*
* 2 external registers are involved:
* pcmcia_status (offset 0x04): bits [0:1/2:3]: read card voltage id
* pcmcia_control(offset 0x10):
* bits[0:1] set vcc for card
* bits[2:3] set vpp for card
* bit 4: enable data buffers
* bit 7: reset# for card
* add 8 for second socket.
*/
static int db1x_pcmcia_configure(struct pcmcia_socket *skt,
struct socket_state_t *state)
{
struct db1x_pcmcia_sock *sock = to_db1x_socket(skt);
unsigned short cr_clr, cr_set;
unsigned int changed;
int v, p, ret;
/* card voltage setup */
cr_clr = (0xf << (sock->nr * 8)); /* clear voltage settings */
cr_set = 0;
v = p = ret = 0;
switch (state->Vcc) {
case 50:
++v;
case 33:
++v;
case 0:
break;
default:
printk(KERN_INFO "pcmcia%d unsupported Vcc %d\n",
sock->nr, state->Vcc);
}
switch (state->Vpp) {
case 12:
++p;
case 33:
case 50:
++p;
case 0:
break;
default:
printk(KERN_INFO "pcmcia%d unsupported Vpp %d\n",
sock->nr, state->Vpp);
}
/* sanity check: Vpp must be 0, 12, or Vcc */
if (((state->Vcc == 33) && (state->Vpp == 50)) ||
((state->Vcc == 50) && (state->Vpp == 33))) {
printk(KERN_INFO "pcmcia%d bad Vcc/Vpp combo (%d %d)\n",
sock->nr, state->Vcc, state->Vpp);
v = p = 0;
ret = -EINVAL;
}
/* create new voltage code */
if (sock->board_type != BOARD_TYPE_DB1300)
cr_set |= ((v << 2) | p) << (sock->nr * 8);
changed = state->flags ^ sock->old_flags;
if (changed & SS_RESET) {
if (state->flags & SS_RESET) {
set_stschg(sock, 0);
/* assert reset, disable io buffers */
cr_clr |= (1 << (7 + (sock->nr * 8)));
cr_clr |= (1 << (4 + (sock->nr * 8)));
} else {
/* de-assert reset, enable io buffers */
cr_set |= 1 << (7 + (sock->nr * 8));
cr_set |= 1 << (4 + (sock->nr * 8));
}
}
/* update PCMCIA configuration */
bcsr_mod(BCSR_PCMCIA, cr_clr, cr_set);
sock->old_flags = state->flags;
/* reset was taken away: give card time to initialize properly */
if ((changed & SS_RESET) && !(state->flags & SS_RESET)) {
msleep(500);
set_stschg(sock, 1);
}
return ret;
}
/* VCC bits at [3:2]/[11:10] */
#define GET_VCC(cr, socknr) \
((((cr) >> 2) >> ((socknr) * 8)) & 3)
/* VS bits at [0:1]/[3:2] */
#define GET_VS(sr, socknr) \
(((sr) >> (2 * (socknr))) & 3)
/* reset bits at [7]/[15] */
#define GET_RESET(cr, socknr) \
((cr) & (1 << (7 + (8 * (socknr)))))
static int db1x_pcmcia_get_status(struct pcmcia_socket *skt,
unsigned int *value)
{
struct db1x_pcmcia_sock *sock = to_db1x_socket(skt);
unsigned short cr, sr;
unsigned int status;
status = db1x_card_inserted(sock) ? SS_DETECT : 0;
cr = bcsr_read(BCSR_PCMCIA);
sr = bcsr_read(BCSR_STATUS);
/* PB1100/PB1500: voltage key bits are at [5:4] */
if (sock->board_type == BOARD_TYPE_PB1100)
sr >>= 4;
/* determine card type */
switch (GET_VS(sr, sock->nr)) {
case 0:
case 2:
status |= SS_3VCARD; /* 3V card */
case 3:
break; /* 5V card: set nothing */
default:
status |= SS_XVCARD; /* treated as unsupported in core */
}
/* if Vcc is not zero, we have applied power to a card */
status |= GET_VCC(cr, sock->nr) ? SS_POWERON : 0;
/* DB1300: power always on, but don't tell when no card present */
if ((sock->board_type == BOARD_TYPE_DB1300) && (status & SS_DETECT))
status = SS_POWERON | SS_3VCARD | SS_DETECT;
/* reset de-asserted? then we're ready */
status |= (GET_RESET(cr, sock->nr)) ? SS_READY : SS_RESET;
*value = status;
return 0;
}
static int db1x_pcmcia_sock_init(struct pcmcia_socket *skt)
{
return 0;
}
static int db1x_pcmcia_sock_suspend(struct pcmcia_socket *skt)
{
return 0;
}
static int au1x00_pcmcia_set_io_map(struct pcmcia_socket *skt,
struct pccard_io_map *map)
{
struct db1x_pcmcia_sock *sock = to_db1x_socket(skt);
map->start = (u32)sock->virt_io;
map->stop = map->start + IO_MAP_SIZE;
return 0;
}
static int au1x00_pcmcia_set_mem_map(struct pcmcia_socket *skt,
struct pccard_mem_map *map)
{
struct db1x_pcmcia_sock *sock = to_db1x_socket(skt);
if (map->flags & MAP_ATTRIB)
map->static_start = sock->phys_attr + map->card_start;
else
map->static_start = sock->phys_mem + map->card_start;
return 0;
}
static struct pccard_operations db1x_pcmcia_operations = {
.init = db1x_pcmcia_sock_init,
.suspend = db1x_pcmcia_sock_suspend,
.get_status = db1x_pcmcia_get_status,
.set_socket = db1x_pcmcia_configure,
.set_io_map = au1x00_pcmcia_set_io_map,
.set_mem_map = au1x00_pcmcia_set_mem_map,
};
static int db1x_pcmcia_socket_probe(struct platform_device *pdev)
{
struct db1x_pcmcia_sock *sock;
struct resource *r;
int ret, bid;
sock = kzalloc(sizeof(struct db1x_pcmcia_sock), GFP_KERNEL);
if (!sock)
return -ENOMEM;
sock->nr = pdev->id;
bid = BCSR_WHOAMI_BOARD(bcsr_read(BCSR_WHOAMI));
switch (bid) {
case BCSR_WHOAMI_PB1500:
case BCSR_WHOAMI_PB1500R2:
case BCSR_WHOAMI_PB1100:
sock->board_type = BOARD_TYPE_PB1100;
break;
case BCSR_WHOAMI_DB1000 ... BCSR_WHOAMI_PB1550_SDR:
sock->board_type = BOARD_TYPE_DEFAULT;
break;
case BCSR_WHOAMI_PB1200 ... BCSR_WHOAMI_DB1200:
sock->board_type = BOARD_TYPE_DB1200;
break;
case BCSR_WHOAMI_DB1300:
sock->board_type = BOARD_TYPE_DB1300;
break;
default:
printk(KERN_INFO "db1xxx-ss: unknown board %d!\n", bid);
ret = -ENODEV;
goto out0;
};
/*
* gather resources necessary and optional nice-to-haves to
* operate a socket:
* This includes IRQs for Carddetection/ejection, the card
* itself and optional status change detection.
* Also, the memory areas covered by a socket. For these
* we require the real 36bit addresses (see the au1000.h
* header for more information).
*/
/* card: irq assigned to the card itself. */
r = platform_get_resource_byname(pdev, IORESOURCE_IRQ, "card");
sock->card_irq = r ? r->start : 0;
/* insert: irq which triggers on card insertion/ejection */
r = platform_get_resource_byname(pdev, IORESOURCE_IRQ, "insert");
sock->insert_irq = r ? r->start : -1;
/* stschg: irq which trigger on card status change (optional) */
r = platform_get_resource_byname(pdev, IORESOURCE_IRQ, "stschg");
sock->stschg_irq = r ? r->start : -1;
/* eject: irq which triggers on ejection (DB1200/PB1200 only) */
r = platform_get_resource_byname(pdev, IORESOURCE_IRQ, "eject");
sock->eject_irq = r ? r->start : -1;
ret = -ENODEV;
/* 36bit PCMCIA Attribute area address */
r = platform_get_resource_byname(pdev, IORESOURCE_MEM, "pcmcia-attr");
if (!r) {
printk(KERN_ERR "pcmcia%d has no 'pseudo-attr' resource!\n",
sock->nr);
goto out0;
}
sock->phys_attr = r->start;
/* 36bit PCMCIA Memory area address */
r = platform_get_resource_byname(pdev, IORESOURCE_MEM, "pcmcia-mem");
if (!r) {
printk(KERN_ERR "pcmcia%d has no 'pseudo-mem' resource!\n",
sock->nr);
goto out0;
}
sock->phys_mem = r->start;
/* 36bit PCMCIA IO area address */
r = platform_get_resource_byname(pdev, IORESOURCE_MEM, "pcmcia-io");
if (!r) {
printk(KERN_ERR "pcmcia%d has no 'pseudo-io' resource!\n",
sock->nr);
goto out0;
}
sock->phys_io = r->start;
/*
* PCMCIA client drivers use the inb/outb macros to access
* the IO registers. Since mips_io_port_base is added
* to the access address of the mips implementation of
* inb/outb, we need to subtract it here because we want
* to access the I/O or MEM address directly, without
* going through this "mips_io_port_base" mechanism.
*/
sock->virt_io = (void *)(ioremap(sock->phys_io, IO_MAP_SIZE) -
mips_io_port_base);
if (!sock->virt_io) {
printk(KERN_ERR "pcmcia%d: cannot remap IO area\n",
sock->nr);
ret = -ENOMEM;
goto out0;
}
sock->socket.ops = &db1x_pcmcia_operations;
sock->socket.owner = THIS_MODULE;
sock->socket.pci_irq = sock->card_irq;
sock->socket.features = SS_CAP_STATIC_MAP | SS_CAP_PCCARD;
sock->socket.map_size = MEM_MAP_SIZE;
sock->socket.io_offset = (unsigned long)sock->virt_io;
sock->socket.dev.parent = &pdev->dev;
sock->socket.resource_ops = &pccard_static_ops;
platform_set_drvdata(pdev, sock);
ret = db1x_pcmcia_setup_irqs(sock);
if (ret) {
printk(KERN_ERR "pcmcia%d cannot setup interrupts\n",
sock->nr);
goto out1;
}
set_stschg(sock, 0);
ret = pcmcia_register_socket(&sock->socket);
if (ret) {
printk(KERN_ERR "pcmcia%d failed to register\n", sock->nr);
goto out2;
}
printk(KERN_INFO "Alchemy Db/Pb1xxx pcmcia%d @ io/attr/mem %09llx"
"(%p) %09llx %09llx card/insert/stschg/eject irqs @ %d "
"%d %d %d\n", sock->nr, sock->phys_io, sock->virt_io,
sock->phys_attr, sock->phys_mem, sock->card_irq,
sock->insert_irq, sock->stschg_irq, sock->eject_irq);
return 0;
out2:
db1x_pcmcia_free_irqs(sock);
out1:
iounmap((void *)(sock->virt_io + (u32)mips_io_port_base));
out0:
kfree(sock);
return ret;
}
static int db1x_pcmcia_socket_remove(struct platform_device *pdev)
{
struct db1x_pcmcia_sock *sock = platform_get_drvdata(pdev);
db1x_pcmcia_free_irqs(sock);
pcmcia_unregister_socket(&sock->socket);
iounmap((void *)(sock->virt_io + (u32)mips_io_port_base));
kfree(sock);
return 0;
}
static struct platform_driver db1x_pcmcia_socket_driver = {
.driver = {
.name = "db1xxx_pcmcia",
.owner = THIS_MODULE,
},
.probe = db1x_pcmcia_socket_probe,
.remove = db1x_pcmcia_socket_remove,
};
module_platform_driver(db1x_pcmcia_socket_driver);
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("PCMCIA Socket Services for Alchemy Db/Pb1x00 boards");
MODULE_AUTHOR("Manuel Lauss");