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linux/arch/arm/mach-s3c/s3c64xx.c
Ricardo B. Marliere a3891621d4 ARM: s3c64xx: make bus_type const 
Since commit d492cc2573 ("driver core: device.h: make struct bus_type
a const *"), the driver core can properly handle constant struct
bus_type, move the s3c6410_subsys variable to be a constant structure as
well, placing it into read-only memory which can not be modified at
runtime.

Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Suggested-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Ricardo B. Marliere <ricardo@marliere.net>
Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Link: https://lore.kernel.org/r/20240204-bus_cleanup-arm-v1-1-41d651dd8411@marliere.net
Link: https://lore.kernel.org/r/20240211-bus_cleanup-arm-v2-1-3de9e8af7cbd@marliere.net
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
2024-02-12 08:28:44 +01:00

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// SPDX-License-Identifier: GPL-2.0
//
// Copyright (c) 2011 Samsung Electronics Co., Ltd.
// http://www.samsung.com
//
// Copyright 2008 Openmoko, Inc.
// Copyright 2008 Simtec Electronics
// Ben Dooks <ben@simtec.co.uk>
// http://armlinux.simtec.co.uk/
//
// Common Codes for S3C64XX machines
/*
* NOTE: Code in this file is not used when booting with Device Tree support.
*/
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/interrupt.h>
#include <linux/ioport.h>
#include <linux/serial_core.h>
#include <linux/serial_s3c.h>
#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/reboot.h>
#include <linux/io.h>
#include <linux/clk/samsung.h>
#include <linux/dma-mapping.h>
#include <linux/irq.h>
#include <linux/irqchip/arm-vic.h>
#include <clocksource/samsung_pwm.h>
#include <asm/mach/arch.h>
#include <asm/mach/map.h>
#include <asm/system_misc.h>
#include "map.h"
#include "irqs.h"
#include "regs-gpio.h"
#include "gpio-samsung.h"
#include "cpu.h"
#include "devs.h"
#include "pm.h"
#include "gpio-cfg.h"
#include "pwm-core.h"
#include "regs-irqtype.h"
#include "s3c64xx.h"
#include "irq-uart-s3c64xx.h"
/* External clock frequency */
static unsigned long xtal_f __ro_after_init = 12000000;
static unsigned long xusbxti_f __ro_after_init = 48000000;
void __init s3c64xx_set_xtal_freq(unsigned long freq)
{
xtal_f = freq;
}
void __init s3c64xx_set_xusbxti_freq(unsigned long freq)
{
xusbxti_f = freq;
}
/* uart registration process */
static void __init s3c64xx_init_uarts(struct s3c2410_uartcfg *cfg, int no)
{
s3c24xx_init_uartdevs("s3c6400-uart", s3c64xx_uart_resources, cfg, no);
}
/* table of supported CPUs */
static const char name_s3c6410[] = "S3C6410";
static struct cpu_table cpu_ids[] __initdata = {
{
.idcode = S3C6410_CPU_ID,
.idmask = S3C64XX_CPU_MASK,
.map_io = s3c6410_map_io,
.init_uarts = s3c64xx_init_uarts,
.init = s3c6410_init,
.name = name_s3c6410,
},
};
/* minimal IO mapping */
/*
* note, for the boot process to work we have to keep the UART
* virtual address aligned to an 1MiB boundary for the L1
* mapping the head code makes. We keep the UART virtual address
* aligned and add in the offset when we load the value here.
*/
#define UART_OFFS (S3C_PA_UART & 0xfffff)
static struct map_desc s3c_iodesc[] __initdata = {
{
.virtual = (unsigned long)S3C_VA_SYS,
.pfn = __phys_to_pfn(S3C64XX_PA_SYSCON),
.length = SZ_4K,
.type = MT_DEVICE,
}, {
.virtual = (unsigned long)S3C_VA_MEM,
.pfn = __phys_to_pfn(S3C64XX_PA_SROM),
.length = SZ_4K,
.type = MT_DEVICE,
}, {
.virtual = (unsigned long)(S3C_VA_UART + UART_OFFS),
.pfn = __phys_to_pfn(S3C_PA_UART),
.length = SZ_4K,
.type = MT_DEVICE,
}, {
.virtual = (unsigned long)VA_VIC0,
.pfn = __phys_to_pfn(S3C64XX_PA_VIC0),
.length = SZ_16K,
.type = MT_DEVICE,
}, {
.virtual = (unsigned long)VA_VIC1,
.pfn = __phys_to_pfn(S3C64XX_PA_VIC1),
.length = SZ_16K,
.type = MT_DEVICE,
}, {
.virtual = (unsigned long)S3C_VA_TIMER,
.pfn = __phys_to_pfn(S3C_PA_TIMER),
.length = SZ_16K,
.type = MT_DEVICE,
}, {
.virtual = (unsigned long)S3C64XX_VA_GPIO,
.pfn = __phys_to_pfn(S3C64XX_PA_GPIO),
.length = SZ_4K,
.type = MT_DEVICE,
}, {
.virtual = (unsigned long)S3C64XX_VA_MODEM,
.pfn = __phys_to_pfn(S3C64XX_PA_MODEM),
.length = SZ_4K,
.type = MT_DEVICE,
}, {
.virtual = (unsigned long)S3C_VA_WATCHDOG,
.pfn = __phys_to_pfn(S3C64XX_PA_WATCHDOG),
.length = SZ_4K,
.type = MT_DEVICE,
}, {
.virtual = (unsigned long)S3C_VA_USB_HSPHY,
.pfn = __phys_to_pfn(S3C64XX_PA_USB_HSPHY),
.length = SZ_1K,
.type = MT_DEVICE,
},
};
static const struct bus_type s3c64xx_subsys = {
.name = "s3c64xx-core",
.dev_name = "s3c64xx-core",
};
static struct device s3c64xx_dev = {
.bus = &s3c64xx_subsys,
};
static struct samsung_pwm_variant s3c64xx_pwm_variant = {
.bits = 32,
.div_base = 0,
.has_tint_cstat = true,
.tclk_mask = (1 << 7) | (1 << 6) | (1 << 5),
};
void __init s3c64xx_set_timer_source(enum s3c64xx_timer_mode event,
enum s3c64xx_timer_mode source)
{
s3c64xx_pwm_variant.output_mask = BIT(SAMSUNG_PWM_NUM) - 1;
s3c64xx_pwm_variant.output_mask &= ~(BIT(event) | BIT(source));
}
void __init s3c64xx_timer_init(void)
{
unsigned int timer_irqs[SAMSUNG_PWM_NUM] = {
IRQ_TIMER0_VIC, IRQ_TIMER1_VIC, IRQ_TIMER2_VIC,
IRQ_TIMER3_VIC, IRQ_TIMER4_VIC,
};
samsung_pwm_clocksource_init(S3C_VA_TIMER,
timer_irqs, &s3c64xx_pwm_variant);
}
/* read cpu identification code */
void __init s3c64xx_init_io(struct map_desc *mach_desc, int size)
{
/* initialise the io descriptors we need for initialisation */
iotable_init(s3c_iodesc, ARRAY_SIZE(s3c_iodesc));
iotable_init(mach_desc, size);
/* detect cpu id */
s3c64xx_init_cpu();
s3c_init_cpu(samsung_cpu_id, cpu_ids, ARRAY_SIZE(cpu_ids));
samsung_pwm_set_platdata(&s3c64xx_pwm_variant);
}
static __init int s3c64xx_dev_init(void)
{
/* Not applicable when using DT. */
if (of_have_populated_dt() || !soc_is_s3c64xx())
return 0;
subsys_system_register(&s3c64xx_subsys, NULL);
return device_register(&s3c64xx_dev);
}
core_initcall(s3c64xx_dev_init);
/*
* setup the sources the vic should advertise resume
* for, even though it is not doing the wake
* (set_irq_wake needs to be valid)
*/
#define IRQ_VIC0_RESUME (1 << (IRQ_RTC_TIC - IRQ_VIC0_BASE))
#define IRQ_VIC1_RESUME (1 << (IRQ_RTC_ALARM - IRQ_VIC1_BASE) | \
1 << (IRQ_PENDN - IRQ_VIC1_BASE) | \
1 << (IRQ_HSMMC0 - IRQ_VIC1_BASE) | \
1 << (IRQ_HSMMC1 - IRQ_VIC1_BASE) | \
1 << (IRQ_HSMMC2 - IRQ_VIC1_BASE))
void __init s3c64xx_init_irq(u32 vic0_valid, u32 vic1_valid)
{
s3c64xx_clk_init(NULL, xtal_f, xusbxti_f, soc_is_s3c6400(), S3C_VA_SYS);
printk(KERN_DEBUG "%s: initialising interrupts\n", __func__);
/* initialise the pair of VICs */
vic_init(VA_VIC0, IRQ_VIC0_BASE, vic0_valid, IRQ_VIC0_RESUME);
vic_init(VA_VIC1, IRQ_VIC1_BASE, vic1_valid, IRQ_VIC1_RESUME);
}
#define eint_offset(irq) ((irq) - IRQ_EINT(0))
#define eint_irq_to_bit(irq) ((u32)(1 << eint_offset(irq)))
static inline void s3c_irq_eint_mask(struct irq_data *data)
{
u32 mask;
mask = __raw_readl(S3C64XX_EINT0MASK);
mask |= (u32)data->chip_data;
__raw_writel(mask, S3C64XX_EINT0MASK);
}
static void s3c_irq_eint_unmask(struct irq_data *data)
{
u32 mask;
mask = __raw_readl(S3C64XX_EINT0MASK);
mask &= ~((u32)data->chip_data);
__raw_writel(mask, S3C64XX_EINT0MASK);
}
static inline void s3c_irq_eint_ack(struct irq_data *data)
{
__raw_writel((u32)data->chip_data, S3C64XX_EINT0PEND);
}
static void s3c_irq_eint_maskack(struct irq_data *data)
{
/* compiler should in-line these */
s3c_irq_eint_mask(data);
s3c_irq_eint_ack(data);
}
static int s3c_irq_eint_set_type(struct irq_data *data, unsigned int type)
{
int offs = eint_offset(data->irq);
int pin, pin_val;
int shift;
u32 ctrl, mask;
u32 newvalue = 0;
void __iomem *reg;
if (offs > 27)
return -EINVAL;
if (offs <= 15)
reg = S3C64XX_EINT0CON0;
else
reg = S3C64XX_EINT0CON1;
switch (type) {
case IRQ_TYPE_NONE:
printk(KERN_WARNING "No edge setting!\n");
break;
case IRQ_TYPE_EDGE_RISING:
newvalue = S3C2410_EXTINT_RISEEDGE;
break;
case IRQ_TYPE_EDGE_FALLING:
newvalue = S3C2410_EXTINT_FALLEDGE;
break;
case IRQ_TYPE_EDGE_BOTH:
newvalue = S3C2410_EXTINT_BOTHEDGE;
break;
case IRQ_TYPE_LEVEL_LOW:
newvalue = S3C2410_EXTINT_LOWLEV;
break;
case IRQ_TYPE_LEVEL_HIGH:
newvalue = S3C2410_EXTINT_HILEV;
break;
default:
printk(KERN_ERR "No such irq type %d", type);
return -1;
}
if (offs <= 15)
shift = (offs / 2) * 4;
else
shift = ((offs - 16) / 2) * 4;
mask = 0x7 << shift;
ctrl = __raw_readl(reg);
ctrl &= ~mask;
ctrl |= newvalue << shift;
__raw_writel(ctrl, reg);
/* set the GPIO pin appropriately */
if (offs < 16) {
pin = S3C64XX_GPN(offs);
pin_val = S3C_GPIO_SFN(2);
} else if (offs < 23) {
pin = S3C64XX_GPL(offs + 8 - 16);
pin_val = S3C_GPIO_SFN(3);
} else {
pin = S3C64XX_GPM(offs - 23);
pin_val = S3C_GPIO_SFN(3);
}
s3c_gpio_cfgpin(pin, pin_val);
return 0;
}
static struct irq_chip s3c_irq_eint = {
.name = "s3c-eint",
.irq_mask = s3c_irq_eint_mask,
.irq_unmask = s3c_irq_eint_unmask,
.irq_mask_ack = s3c_irq_eint_maskack,
.irq_ack = s3c_irq_eint_ack,
.irq_set_type = s3c_irq_eint_set_type,
.irq_set_wake = s3c_irqext_wake,
};
/* s3c_irq_demux_eint
*
* This function demuxes the IRQ from the group0 external interrupts,
* from IRQ_EINT(0) to IRQ_EINT(27). It is designed to be inlined into
* the specific handlers s3c_irq_demux_eintX_Y.
*/
static inline void s3c_irq_demux_eint(unsigned int start, unsigned int end)
{
u32 status = __raw_readl(S3C64XX_EINT0PEND);
u32 mask = __raw_readl(S3C64XX_EINT0MASK);
unsigned int irq;
status &= ~mask;
status >>= start;
status &= (1 << (end - start + 1)) - 1;
for (irq = IRQ_EINT(start); irq <= IRQ_EINT(end); irq++) {
if (status & 1)
generic_handle_irq(irq);
status >>= 1;
}
}
static void s3c_irq_demux_eint0_3(struct irq_desc *desc)
{
s3c_irq_demux_eint(0, 3);
}
static void s3c_irq_demux_eint4_11(struct irq_desc *desc)
{
s3c_irq_demux_eint(4, 11);
}
static void s3c_irq_demux_eint12_19(struct irq_desc *desc)
{
s3c_irq_demux_eint(12, 19);
}
static void s3c_irq_demux_eint20_27(struct irq_desc *desc)
{
s3c_irq_demux_eint(20, 27);
}
static int __init s3c64xx_init_irq_eint(void)
{
int irq;
/* On DT-enabled systems EINTs are handled by pinctrl-s3c64xx driver. */
if (of_have_populated_dt() || !soc_is_s3c64xx())
return -ENODEV;
for (irq = IRQ_EINT(0); irq <= IRQ_EINT(27); irq++) {
irq_set_chip_and_handler(irq, &s3c_irq_eint, handle_level_irq);
irq_set_chip_data(irq, (void *)eint_irq_to_bit(irq));
irq_clear_status_flags(irq, IRQ_NOREQUEST);
}
irq_set_chained_handler(IRQ_EINT0_3, s3c_irq_demux_eint0_3);
irq_set_chained_handler(IRQ_EINT4_11, s3c_irq_demux_eint4_11);
irq_set_chained_handler(IRQ_EINT12_19, s3c_irq_demux_eint12_19);
irq_set_chained_handler(IRQ_EINT20_27, s3c_irq_demux_eint20_27);
return 0;
}
arch_initcall(s3c64xx_init_irq_eint);
#ifndef CONFIG_COMPILE_TEST
#pragma message "The platform is deprecated and scheduled for removal. " \
"Please reach to the maintainers of the platform " \
"and linux-samsung-soc@vger.kernel.org if you still use it." \
"Without such feedback, the platform will be removed after 2024."
#endif
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