mirrors/linux-stable
1
0
Fork 0
mirror of https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git synced 2024-08-23 17:30:02 +00:00
Code Issues Releases Wiki Activity
linux-stable/arch/arm/mach-s3c/s3c64xx.c
Krzysztof Kozlowski 6a5e69c7dd ARM: s3c: mark as deprecated and schedule removal 
The Samsung S3C24xx and S3C64xx platforms are very old designs. S3C2416
was introduced in 2008 and S3C6410 in 2009/2010.  They are not widely
available anymore - out-of-stock on FriendlyArm (one of manufacturers of
boards) and only few specialist stores still offer them for quite a high
price.

The community around these platforms was not very active, so I suspect
no one really uses them anymore. Maintenance takes precious time so
there is little sense in keeping them alive if there are no real users.

Let's mark all S3C24xx and S3C64xx platforms as deprecated and mention
possible removal in after 2022 for the first and 2024 for the lattere.
The deprecation message will be as text in Kconfig, build message (not a
warning though) and runtime print error.

If there are any users, they might respond and postpone the removal.

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Acked-by: Heiko Stuebner <heiko@sntech.de>
Acked-by: Tomasz Figa <tomasz.figa@gmail.com>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Link: https://lore.kernel.org/r/20220407072319.75614-1-krzysztof.kozlowski@linaro.org
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
2022-04-21 15:11:40 +02:00

434 lines
10 KiB
C
Raw Blame History

// 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/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/gpio.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_s3c6400[] = "S3C6400";
static const char name_s3c6410[] = "S3C6410";
static struct cpu_table cpu_ids[] __initdata = {
{
.idcode = S3C6400_CPU_ID,
.idmask = S3C64XX_CPU_MASK,
.map_io = s3c6400_map_io,
.init_uarts = s3c64xx_init_uarts,
.init = s3c6400_init,
.name = name_s3c6400,
}, {
.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 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(unsigned int event, unsigned int 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
Reference in a new issue View git blame Copy permalink