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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* linux/arch/arm/mach-integrator/integrator_ap.c
*
* Copyright (C) 2000-2003 Deep Blue Solutions Ltd
*/
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/syscore_ops.h>
#include <linux/amba/bus.h>
#include <linux/io.h>
#include <linux/irqchip.h>
#include <linux/of_irq.h>
#include <linux/of_address.h>
#include <linux/of_platform.h>
#include <linux/termios.h>
#include <linux/mfd/syscon.h>
#include <linux/regmap.h>
#include <asm/mach/arch.h>
#include <asm/mach/map.h>
#include "hardware.h"
#include "cm.h"
#include "common.h"
/* Regmap to the AP system controller */
static struct regmap *ap_syscon_map;
/*
* All IO addresses are mapped onto VA 0xFFFx.xxxx, where x.xxxx
* is the (PA >> 12).
*
* Setup a VA for the Integrator interrupt controller (for header #0,
* just for now).
*/
#define VA_IC_BASE __io_address(INTEGRATOR_IC_BASE)
/*
* Logical Physical
* f1400000 14000000 Interrupt controller
* f1600000 16000000 UART 0
*/
static struct map_desc ap_io_desc[] __initdata __maybe_unused = {
{
.virtual = IO_ADDRESS(INTEGRATOR_IC_BASE),
.pfn = __phys_to_pfn(INTEGRATOR_IC_BASE),
.length = SZ_4K,
.type = MT_DEVICE
}, {
.virtual = IO_ADDRESS(INTEGRATOR_UART0_BASE),
.pfn = __phys_to_pfn(INTEGRATOR_UART0_BASE),
.length = SZ_4K,
.type = MT_DEVICE
}
};
static void __init ap_map_io(void)
{
iotable_init(ap_io_desc, ARRAY_SIZE(ap_io_desc));
}
#ifdef CONFIG_PM
static unsigned long ic_irq_enable;
static int irq_suspend(void)
{
ic_irq_enable = readl(VA_IC_BASE + IRQ_ENABLE);
return 0;
}
static void irq_resume(void)
{
/* disable all irq sources */
cm_clear_irqs();
writel(-1, VA_IC_BASE + IRQ_ENABLE_CLEAR);
writel(-1, VA_IC_BASE + FIQ_ENABLE_CLEAR);
writel(ic_irq_enable, VA_IC_BASE + IRQ_ENABLE_SET);
}
#else
#define irq_suspend NULL
#define irq_resume NULL
#endif
static struct syscore_ops irq_syscore_ops = {
.suspend = irq_suspend,
.resume = irq_resume,
};
static int __init irq_syscore_init(void)
{
register_syscore_ops(&irq_syscore_ops);
return 0;
}
device_initcall(irq_syscore_init);
/*
* For the PL010 found in the Integrator/AP some of the UART control is
* implemented in the system controller and accessed using a callback
* from the driver.
*/
static void integrator_uart_set_mctrl(struct amba_device *dev,
void __iomem *base, unsigned int mctrl)
{
unsigned int ctrls = 0, ctrlc = 0, rts_mask, dtr_mask;
u32 phybase = dev->res.start;
int ret;
if (phybase == INTEGRATOR_UART0_BASE) {
/* UART0 */
rts_mask = 1 << 4;
dtr_mask = 1 << 5;
} else {
/* UART1 */
rts_mask = 1 << 6;
dtr_mask = 1 << 7;
}
if (mctrl & TIOCM_RTS)
ctrlc |= rts_mask;
else
ctrls |= rts_mask;
if (mctrl & TIOCM_DTR)
ctrlc |= dtr_mask;
else
ctrls |= dtr_mask;
ret = regmap_write(ap_syscon_map,
INTEGRATOR_SC_CTRLS_OFFSET,
ctrls);
if (ret)
pr_err("MODEM: unable to write PL010 UART CTRLS\n");
ret = regmap_write(ap_syscon_map,
INTEGRATOR_SC_CTRLC_OFFSET,
ctrlc);
if (ret)
pr_err("MODEM: unable to write PL010 UART CRTLC\n");
}
struct amba_pl010_data ap_uart_data = {
.set_mctrl = integrator_uart_set_mctrl,
};
void __init ap_init_early(void)
{
}
static void __init ap_init_irq_of(void)
{
cm_init();
irqchip_init();
}
/* For the Device Tree, add in the UART callbacks as AUXDATA */
static struct of_dev_auxdata ap_auxdata_lookup[] __initdata = {
OF_DEV_AUXDATA("arm,primecell", INTEGRATOR_UART0_BASE,
"uart0", &ap_uart_data),
OF_DEV_AUXDATA("arm,primecell", INTEGRATOR_UART1_BASE,
"uart1", &ap_uart_data),
{ /* sentinel */ },
};
static const struct of_device_id ap_syscon_match[] = {
{ .compatible = "arm,integrator-ap-syscon"},
{ },
};
static void __init ap_init_of(void)
{
struct device_node *syscon;
of_platform_default_populate(NULL, ap_auxdata_lookup, NULL);
syscon = of_find_matching_node(NULL, ap_syscon_match);
if (!syscon)
return;
ap_syscon_map = syscon_node_to_regmap(syscon);
if (IS_ERR(ap_syscon_map)) {
pr_crit("could not find Integrator/AP system controller\n");
return;
}
}
static const char * ap_dt_board_compat[] = {
"arm,integrator-ap",
NULL,
};
DT_MACHINE_START(INTEGRATOR_AP_DT, "ARM Integrator/AP (Device Tree)")
.reserve = integrator_reserve,
.map_io = ap_map_io,
.init_early = ap_init_early,
.init_irq = ap_init_irq_of,
.init_machine = ap_init_of,
.dt_compat = ap_dt_board_compat,
MACHINE_END
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