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linux/arch/arm/mach-ixp4xx/common.c
Deepak Saxena 54e269ead6 [ARM] 3226/1: IXP4xx runtime expansion bus window size configuration 
Patch from Deepak Saxena

The expansion bus on the IXP46x NPU can be configured for either 32MiB or
16MiB windows and changing the configuration causes the base address for
each chip select for each region to change. Because of this, we cannot
hardcode the physical base as we currently do. This patch checks the
expansion bus configuration registers at runtime to determine the
appropriate window size. Note that this requires that the bootloader
already configured the device sizes appropriately, but I feel that is
valid assumption to make as the bootloader must configure and access
the flash window, the output display (LCD, LEDs, etc) window, and
other expansion bus devices.

Signed-off-by: Deepak Saxena <dsaxena@plexity.net>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2006-01-05 20:59:29 +00:00

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/*
* arch/arm/mach-ixp4xx/common.c
*
* Generic code shared across all IXP4XX platforms
*
* Maintainer: Deepak Saxena <dsaxena@plexity.net>
*
* Copyright 2002 (c) Intel Corporation
* Copyright 2003-2004 (c) MontaVista, Software, Inc.
*
* This file is licensed under the terms of the GNU General Public
* License version 2. This program is licensed "as is" without any
* warranty of any kind, whether express or implied.
*/
#include <linux/config.h>
#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/init.h>
#include <linux/serial.h>
#include <linux/sched.h>
#include <linux/tty.h>
#include <linux/platform_device.h>
#include <linux/serial_core.h>
#include <linux/bootmem.h>
#include <linux/interrupt.h>
#include <linux/bitops.h>
#include <linux/time.h>
#include <linux/timex.h>
#include <asm/hardware.h>
#include <asm/uaccess.h>
#include <asm/io.h>
#include <asm/pgtable.h>
#include <asm/page.h>
#include <asm/irq.h>
#include <asm/mach/map.h>
#include <asm/mach/irq.h>
#include <asm/mach/time.h>
/*************************************************************************
* IXP4xx chipset I/O mapping
*************************************************************************/
static struct map_desc ixp4xx_io_desc[] __initdata = {
{ /* UART, Interrupt ctrl, GPIO, timers, NPEs, MACs, USB .... */
.virtual = IXP4XX_PERIPHERAL_BASE_VIRT,
.pfn = __phys_to_pfn(IXP4XX_PERIPHERAL_BASE_PHYS),
.length = IXP4XX_PERIPHERAL_REGION_SIZE,
.type = MT_DEVICE
}, { /* Expansion Bus Config Registers */
.virtual = IXP4XX_EXP_CFG_BASE_VIRT,
.pfn = __phys_to_pfn(IXP4XX_EXP_CFG_BASE_PHYS),
.length = IXP4XX_EXP_CFG_REGION_SIZE,
.type = MT_DEVICE
}, { /* PCI Registers */
.virtual = IXP4XX_PCI_CFG_BASE_VIRT,
.pfn = __phys_to_pfn(IXP4XX_PCI_CFG_BASE_PHYS),
.length = IXP4XX_PCI_CFG_REGION_SIZE,
.type = MT_DEVICE
},
#ifdef CONFIG_DEBUG_LL
{ /* Debug UART mapping */
.virtual = IXP4XX_DEBUG_UART_BASE_VIRT,
.pfn = __phys_to_pfn(IXP4XX_DEBUG_UART_BASE_PHYS),
.length = IXP4XX_DEBUG_UART_REGION_SIZE,
.type = MT_DEVICE
}
#endif
};
void __init ixp4xx_map_io(void)
{
iotable_init(ixp4xx_io_desc, ARRAY_SIZE(ixp4xx_io_desc));
}
/*************************************************************************
* IXP4xx chipset IRQ handling
*
* TODO: GPIO IRQs should be marked invalid until the user of the IRQ
* (be it PCI or something else) configures that GPIO line
* as an IRQ.
**************************************************************************/
enum ixp4xx_irq_type {
IXP4XX_IRQ_LEVEL, IXP4XX_IRQ_EDGE
};
static void ixp4xx_config_irq(unsigned irq, enum ixp4xx_irq_type type);
/*
* IRQ -> GPIO mapping table
*/
static int irq2gpio[32] = {
-1, -1, -1, -1, -1, -1, 0, 1,
-1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, 2, 3, 4, 5, 6,
7, 8, 9, 10, 11, 12, -1, -1,
};
static int ixp4xx_set_irq_type(unsigned int irq, unsigned int type)
{
int line = irq2gpio[irq];
u32 int_style;
enum ixp4xx_irq_type irq_type;
volatile u32 *int_reg;
/*
* Only for GPIO IRQs
*/
if (line < 0)
return -EINVAL;
if (type & IRQT_BOTHEDGE) {
int_style = IXP4XX_GPIO_STYLE_TRANSITIONAL;
irq_type = IXP4XX_IRQ_EDGE;
} else if (type & IRQT_RISING) {
int_style = IXP4XX_GPIO_STYLE_RISING_EDGE;
irq_type = IXP4XX_IRQ_EDGE;
} else if (type & IRQT_FALLING) {
int_style = IXP4XX_GPIO_STYLE_FALLING_EDGE;
irq_type = IXP4XX_IRQ_EDGE;
} else if (type & IRQT_HIGH) {
int_style = IXP4XX_GPIO_STYLE_ACTIVE_HIGH;
irq_type = IXP4XX_IRQ_LEVEL;
} else if (type & IRQT_LOW) {
int_style = IXP4XX_GPIO_STYLE_ACTIVE_LOW;
irq_type = IXP4XX_IRQ_LEVEL;
} else
return -EINVAL;
ixp4xx_config_irq(irq, irq_type);
if (line >= 8) { /* pins 8-15 */
line -= 8;
int_reg = IXP4XX_GPIO_GPIT2R;
} else { /* pins 0-7 */
int_reg = IXP4XX_GPIO_GPIT1R;
}
/* Clear the style for the appropriate pin */
*int_reg &= ~(IXP4XX_GPIO_STYLE_CLEAR <<
(line * IXP4XX_GPIO_STYLE_SIZE));
*IXP4XX_GPIO_GPISR = (1 << line);
/* Set the new style */
*int_reg |= (int_style << (line * IXP4XX_GPIO_STYLE_SIZE));
return 0;
}
static void ixp4xx_irq_mask(unsigned int irq)
{
if (cpu_is_ixp46x() && irq >= 32)
*IXP4XX_ICMR2 &= ~(1 << (irq - 32));
else
*IXP4XX_ICMR &= ~(1 << irq);
}
static void ixp4xx_irq_unmask(unsigned int irq)
{
if (cpu_is_ixp46x() && irq >= 32)
*IXP4XX_ICMR2 |= (1 << (irq - 32));
else
*IXP4XX_ICMR |= (1 << irq);
}
static void ixp4xx_irq_ack(unsigned int irq)
{
int line = (irq < 32) ? irq2gpio[irq] : -1;
if (line >= 0)
*IXP4XX_GPIO_GPISR = (1 << line);
}
/*
* Level triggered interrupts on GPIO lines can only be cleared when the
* interrupt condition disappears.
*/
static void ixp4xx_irq_level_unmask(unsigned int irq)
{
ixp4xx_irq_ack(irq);
ixp4xx_irq_unmask(irq);
}
static struct irqchip ixp4xx_irq_level_chip = {
.ack = ixp4xx_irq_mask,
.mask = ixp4xx_irq_mask,
.unmask = ixp4xx_irq_level_unmask,
.set_type = ixp4xx_set_irq_type,
};
static struct irqchip ixp4xx_irq_edge_chip = {
.ack = ixp4xx_irq_ack,
.mask = ixp4xx_irq_mask,
.unmask = ixp4xx_irq_unmask,
.set_type = ixp4xx_set_irq_type,
};
static void ixp4xx_config_irq(unsigned irq, enum ixp4xx_irq_type type)
{
switch (type) {
case IXP4XX_IRQ_LEVEL:
set_irq_chip(irq, &ixp4xx_irq_level_chip);
set_irq_handler(irq, do_level_IRQ);
break;
case IXP4XX_IRQ_EDGE:
set_irq_chip(irq, &ixp4xx_irq_edge_chip);
set_irq_handler(irq, do_edge_IRQ);
break;
}
set_irq_flags(irq, IRQF_VALID);
}
void __init ixp4xx_init_irq(void)
{
int i = 0;
/* Route all sources to IRQ instead of FIQ */
*IXP4XX_ICLR = 0x0;
/* Disable all interrupt */
*IXP4XX_ICMR = 0x0;
if (cpu_is_ixp46x()) {
/* Route upper 32 sources to IRQ instead of FIQ */
*IXP4XX_ICLR2 = 0x00;
/* Disable upper 32 interrupts */
*IXP4XX_ICMR2 = 0x00;
}
/* Default to all level triggered */
for(i = 0; i < NR_IRQS; i++)
ixp4xx_config_irq(i, IXP4XX_IRQ_LEVEL);
}
/*************************************************************************
* IXP4xx timer tick
* We use OS timer1 on the CPU for the timer tick and the timestamp
* counter as a source of real clock ticks to account for missed jiffies.
*************************************************************************/
static unsigned volatile last_jiffy_time;
#define CLOCK_TICKS_PER_USEC ((CLOCK_TICK_RATE + USEC_PER_SEC/2) / USEC_PER_SEC)
/* IRQs are disabled before entering here from do_gettimeofday() */
static unsigned long ixp4xx_gettimeoffset(void)
{
u32 elapsed;
elapsed = *IXP4XX_OSTS - last_jiffy_time;
return elapsed / CLOCK_TICKS_PER_USEC;
}
static irqreturn_t ixp4xx_timer_interrupt(int irq, void *dev_id, struct pt_regs *regs)
{
write_seqlock(&xtime_lock);
/* Clear Pending Interrupt by writing '1' to it */
*IXP4XX_OSST = IXP4XX_OSST_TIMER_1_PEND;
/*
* Catch up with the real idea of time
*/
while ((*IXP4XX_OSTS - last_jiffy_time) > LATCH) {
timer_tick(regs);
last_jiffy_time += LATCH;
}
write_sequnlock(&xtime_lock);
return IRQ_HANDLED;
}
static struct irqaction ixp4xx_timer_irq = {
.name = "IXP4xx Timer Tick",
.flags = SA_INTERRUPT | SA_TIMER,
.handler = ixp4xx_timer_interrupt,
};
static void __init ixp4xx_timer_init(void)
{
/* Clear Pending Interrupt by writing '1' to it */
*IXP4XX_OSST = IXP4XX_OSST_TIMER_1_PEND;
/* Setup the Timer counter value */
*IXP4XX_OSRT1 = (LATCH & ~IXP4XX_OST_RELOAD_MASK) | IXP4XX_OST_ENABLE;
/* Reset time-stamp counter */
*IXP4XX_OSTS = 0;
last_jiffy_time = 0;
/* Connect the interrupt handler and enable the interrupt */
setup_irq(IRQ_IXP4XX_TIMER1, &ixp4xx_timer_irq);
}
struct sys_timer ixp4xx_timer = {
.init = ixp4xx_timer_init,
.offset = ixp4xx_gettimeoffset,
};
static struct resource ixp46x_i2c_resources[] = {
[0] = {
.start = 0xc8011000,
.end = 0xc801101c,
.flags = IORESOURCE_MEM,
},
[1] = {
.start = IRQ_IXP4XX_I2C,
.end = IRQ_IXP4XX_I2C,
.flags = IORESOURCE_IRQ
}
};
/*
* I2C controller. The IXP46x uses the same block as the IOP3xx, so
* we just use the same device name.
*/
static struct platform_device ixp46x_i2c_controller = {
.name = "IOP3xx-I2C",
.id = 0,
.num_resources = 2,
.resource = ixp46x_i2c_resources
};
static struct platform_device *ixp46x_devices[] __initdata = {
&ixp46x_i2c_controller
};
unsigned long ixp4xx_exp_bus_size;
void __init ixp4xx_sys_init(void)
{
ixp4xx_exp_bus_size = SZ_16M;
if (cpu_is_ixp46x()) {
int region;
platform_add_devices(ixp46x_devices,
ARRAY_SIZE(ixp46x_devices));
for (region = 0; region < 7; region++) {
if((*(IXP4XX_EXP_REG(0x4 * region)) & 0x200)) {
ixp4xx_exp_bus_size = SZ_32M;
break;
}
}
}
printk("IXP4xx: Using %uMiB expansion bus window size\n",
ixp4xx_exp_bus_size >> 20);
}
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