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linux_dsm_epyc7002/arch/arm/mach-sa1100/neponset.c
Russell King ced8d21cf1 ARM: sa11x0: neponset: implement support for sparse IRQs 
Implement the necessary allocation/freeing functionality to support
sparse IRQs with the Neponset device.  On non-sparse IRQ platforms,
this allows us to dynamically allocate from within the available IRQ
number space.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2012-02-09 15:34:16 +00:00

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9.1 KiB
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/*
* linux/arch/arm/mach-sa1100/neponset.c
*/
#include <linux/err.h>
#include <linux/init.h>
#include <linux/ioport.h>
#include <linux/irq.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/serial_core.h>
#include <linux/slab.h>
#include <asm/mach-types.h>
#include <asm/mach/map.h>
#include <asm/mach/serial_sa1100.h>
#include <asm/hardware/sa1111.h>
#include <asm/sizes.h>
#include <mach/hardware.h>
#include <mach/assabet.h>
#include <mach/neponset.h>
#define NEP_IRQ_SMC91X 0
#define NEP_IRQ_USAR 1
#define NEP_IRQ_SA1111 2
#define NEP_IRQ_NR 3
struct neponset_drvdata {
struct platform_device *sa1111;
struct platform_device *smc91x;
unsigned irq_base;
#ifdef CONFIG_PM_SLEEP
u32 ncr0;
u32 mdm_ctl_0;
#endif
};
void neponset_ncr_frob(unsigned int mask, unsigned int val)
{
unsigned long flags;
local_irq_save(flags);
NCR_0 = (NCR_0 & ~mask) | val;
local_irq_restore(flags);
}
static void neponset_set_mctrl(struct uart_port *port, u_int mctrl)
{
u_int mdm_ctl0 = MDM_CTL_0;
if (port->mapbase == _Ser1UTCR0) {
if (mctrl & TIOCM_RTS)
mdm_ctl0 &= ~MDM_CTL0_RTS2;
else
mdm_ctl0 |= MDM_CTL0_RTS2;
if (mctrl & TIOCM_DTR)
mdm_ctl0 &= ~MDM_CTL0_DTR2;
else
mdm_ctl0 |= MDM_CTL0_DTR2;
} else if (port->mapbase == _Ser3UTCR0) {
if (mctrl & TIOCM_RTS)
mdm_ctl0 &= ~MDM_CTL0_RTS1;
else
mdm_ctl0 |= MDM_CTL0_RTS1;
if (mctrl & TIOCM_DTR)
mdm_ctl0 &= ~MDM_CTL0_DTR1;
else
mdm_ctl0 |= MDM_CTL0_DTR1;
}
MDM_CTL_0 = mdm_ctl0;
}
static u_int neponset_get_mctrl(struct uart_port *port)
{
u_int ret = TIOCM_CD | TIOCM_CTS | TIOCM_DSR;
u_int mdm_ctl1 = MDM_CTL_1;
if (port->mapbase == _Ser1UTCR0) {
if (mdm_ctl1 & MDM_CTL1_DCD2)
ret &= ~TIOCM_CD;
if (mdm_ctl1 & MDM_CTL1_CTS2)
ret &= ~TIOCM_CTS;
if (mdm_ctl1 & MDM_CTL1_DSR2)
ret &= ~TIOCM_DSR;
} else if (port->mapbase == _Ser3UTCR0) {
if (mdm_ctl1 & MDM_CTL1_DCD1)
ret &= ~TIOCM_CD;
if (mdm_ctl1 & MDM_CTL1_CTS1)
ret &= ~TIOCM_CTS;
if (mdm_ctl1 & MDM_CTL1_DSR1)
ret &= ~TIOCM_DSR;
}
return ret;
}
static struct sa1100_port_fns neponset_port_fns __devinitdata = {
.set_mctrl = neponset_set_mctrl,
.get_mctrl = neponset_get_mctrl,
};
/*
* Install handler for Neponset IRQ. Note that we have to loop here
* since the ETHERNET and USAR IRQs are level based, and we need to
* ensure that the IRQ signal is deasserted before returning. This
* is rather unfortunate.
*/
static void neponset_irq_handler(unsigned int irq, struct irq_desc *desc)
{
struct neponset_drvdata *d = irq_desc_get_handler_data(desc);
unsigned int irr;
while (1) {
/*
* Acknowledge the parent IRQ.
*/
desc->irq_data.chip->irq_ack(&desc->irq_data);
/*
* Read the interrupt reason register. Let's have all
* active IRQ bits high. Note: there is a typo in the
* Neponset user's guide for the SA1111 IRR level.
*/
irr = IRR ^ (IRR_ETHERNET | IRR_USAR);
if ((irr & (IRR_ETHERNET | IRR_USAR | IRR_SA1111)) == 0)
break;
/*
* Since there is no individual mask, we have to
* mask the parent IRQ. This is safe, since we'll
* recheck the register for any pending IRQs.
*/
if (irr & (IRR_ETHERNET | IRR_USAR)) {
desc->irq_data.chip->irq_mask(&desc->irq_data);
/*
* Ack the interrupt now to prevent re-entering
* this neponset handler. Again, this is safe
* since we'll check the IRR register prior to
* leaving.
*/
desc->irq_data.chip->irq_ack(&desc->irq_data);
if (irr & IRR_ETHERNET)
generic_handle_irq(d->irq_base + NEP_IRQ_SMC91X);
if (irr & IRR_USAR)
generic_handle_irq(d->irq_base + NEP_IRQ_USAR);
desc->irq_data.chip->irq_unmask(&desc->irq_data);
}
if (irr & IRR_SA1111)
generic_handle_irq(d->irq_base + NEP_IRQ_SA1111);
}
}
/* Yes, we really do not have any kind of masking or unmasking */
static void nochip_noop(struct irq_data *irq)
{
}
static struct irq_chip nochip = {
.name = "neponset",
.irq_ack = nochip_noop,
.irq_mask = nochip_noop,
.irq_unmask = nochip_noop,
};
static struct sa1111_platform_data sa1111_info = {
.irq_base = IRQ_BOARD_END,
};
static int __devinit neponset_probe(struct platform_device *dev)
{
struct neponset_drvdata *d;
struct resource sa1111_resources[] = {
DEFINE_RES_MEM(0x40000000, SZ_8K),
{ .flags = IORESOURCE_IRQ },
};
struct platform_device_info sa1111_devinfo = {
.parent = &dev->dev,
.name = "sa1111",
.id = 0,
.res = sa1111_resources,
.num_res = ARRAY_SIZE(sa1111_resources),
.data = &sa1111_info,
.size_data = sizeof(sa1111_info),
.dma_mask = 0xffffffffUL,
};
struct resource smc91x_resources[] = {
DEFINE_RES_MEM_NAMED(SA1100_CS3_PHYS,
0x02000000, "smc91x-regs"),
DEFINE_RES_MEM_NAMED(SA1100_CS3_PHYS + 0x02000000,
0x02000000, "smc91x-attrib"),
{ .flags = IORESOURCE_IRQ },
};
struct platform_device_info smc91x_devinfo = {
.parent = &dev->dev,
.name = "smc91x",
.id = 0,
.res = smc91x_resources,
.num_res = ARRAY_SIZE(smc91x_resources),
};
int ret;
d = kzalloc(sizeof(*d), GFP_KERNEL);
if (!d) {
ret = -ENOMEM;
goto err_alloc;
}
ret = irq_alloc_descs(-1, IRQ_BOARD_START, NEP_IRQ_NR, -1);
if (ret <= 0) {
dev_err(&dev->dev, "unable to allocate %u irqs: %d\n",
NEP_IRQ_NR, ret);
if (ret == 0)
ret = -ENOMEM;
goto err_irq_alloc;
}
d->irq_base = ret;
irq_set_chip_and_handler(d->irq_base + NEP_IRQ_SMC91X, &nochip,
handle_simple_irq);
set_irq_flags(d->irq_base + NEP_IRQ_SMC91X, IRQF_VALID | IRQF_PROBE);
irq_set_chip_and_handler(d->irq_base + NEP_IRQ_USAR, &nochip,
handle_simple_irq);
set_irq_flags(d->irq_base + NEP_IRQ_USAR, IRQF_VALID | IRQF_PROBE);
irq_set_chip(d->irq_base + NEP_IRQ_SA1111, &nochip);
irq_set_irq_type(IRQ_GPIO25, IRQ_TYPE_EDGE_RISING);
irq_set_handler_data(IRQ_GPIO25, d);
irq_set_chained_handler(IRQ_GPIO25, neponset_irq_handler);
/*
* We would set IRQ_GPIO25 to be a wake-up IRQ, but unfortunately
* something on the Neponset activates this IRQ on sleep (eth?)
*/
#if 0
enable_irq_wake(IRQ_GPIO25);
#endif
dev_info(&dev->dev, "Neponset daughter board, providing IRQ%u-%u\n",
d->irq_base, d->irq_base + NEP_IRQ_NR - 1);
sa1100_register_uart_fns(&neponset_port_fns);
/* Disable GPIO 0/1 drivers so the buttons work on the Assabet */
NCR_0 = NCR_GP01_OFF;
sa1111_resources[1].start = d->irq_base + NEP_IRQ_SA1111;
sa1111_resources[1].end = d->irq_base + NEP_IRQ_SA1111;
d->sa1111 = platform_device_register_full(&sa1111_devinfo);
smc91x_resources[2].start = d->irq_base + NEP_IRQ_SMC91X;
smc91x_resources[2].end = d->irq_base + NEP_IRQ_SMC91X;
d->smc91x = platform_device_register_full(&smc91x_devinfo);
platform_set_drvdata(dev, d);
return 0;
err_irq_alloc:
kfree(d);
err_alloc:
return ret;
}
static int __devexit neponset_remove(struct platform_device *dev)
{
struct neponset_drvdata *d = platform_get_drvdata(dev);
if (!IS_ERR(d->sa1111))
platform_device_unregister(d->sa1111);
if (!IS_ERR(d->smc91x))
platform_device_unregister(d->smc91x);
irq_set_chained_handler(IRQ_GPIO25, NULL);
irq_free_descs(d->irq_base, NEP_IRQ_NR);
kfree(d);
return 0;
}
#ifdef CONFIG_PM
static int neponset_suspend(struct platform_device *dev, pm_message_t state)
{
struct neponset_drvdata *d = platform_get_drvdata(dev);
d->ncr0 = NCR_0;
d->mdm_ctl_0 = MDM_CTL_0;
return 0;
}
static int neponset_resume(struct platform_device *dev)
{
struct neponset_drvdata *d = platform_get_drvdata(dev);
NCR_0 = d->ncr0;
MDM_CTL_0 = d->mdm_ctl_0;
return 0;
}
#else
#define neponset_suspend NULL
#define neponset_resume NULL
#endif
static struct platform_driver neponset_device_driver = {
.probe = neponset_probe,
.remove = __devexit_p(neponset_remove),
.suspend = neponset_suspend,
.resume = neponset_resume,
.driver = {
.name = "neponset",
.owner = THIS_MODULE,
},
};
static struct resource neponset_resources[] = {
[0] = DEFINE_RES_MEM(0x10000000, 0x08000000),
};
static struct platform_device neponset_device = {
.name = "neponset",
.id = 0,
.num_resources = ARRAY_SIZE(neponset_resources),
.resource = neponset_resources,
};
extern void sa1110_mb_disable(void);
static int __init neponset_init(void)
{
platform_driver_register(&neponset_device_driver);
/*
* The Neponset is only present on the Assabet machine type.
*/
if (!machine_is_assabet())
return -ENODEV;
/*
* Ensure that the memory bus request/grant signals are setup,
* and the grant is held in its inactive state, whether or not
* we actually have a Neponset attached.
*/
sa1110_mb_disable();
if (!machine_has_neponset()) {
printk(KERN_DEBUG "Neponset expansion board not present\n");
return -ENODEV;
}
if (WHOAMI != 0x11) {
printk(KERN_WARNING "Neponset board detected, but "
"wrong ID: %02x\n", WHOAMI);
return -ENODEV;
}
return platform_device_register(&neponset_device);
}
subsys_initcall(neponset_init);
static struct map_desc neponset_io_desc[] __initdata = {
{ /* System Registers */
.virtual = 0xf3000000,
.pfn = __phys_to_pfn(0x10000000),
.length = SZ_1M,
.type = MT_DEVICE
}, { /* SA-1111 */
.virtual = 0xf4000000,
.pfn = __phys_to_pfn(0x40000000),
.length = SZ_1M,
.type = MT_DEVICE
}
};
void __init neponset_map_io(void)
{
iotable_init(neponset_io_desc, ARRAY_SIZE(neponset_io_desc));
}
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