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173 lines
3.9 KiB
173 lines
3.9 KiB
// SPDX-License-Identifier: GPL-2.0 |
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// |
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// Copyright (c) 2008 Simtec Electronics |
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// Ben Dooks <[email protected]> |
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// http://armlinux.simtec.co.uk/ |
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// |
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// S3C series CPU initialisation |
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/* |
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* NOTE: Code in this file is not used on S3C64xx when booting with |
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* Device Tree support. |
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*/ |
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#include <linux/init.h> |
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#include <linux/module.h> |
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#include <linux/interrupt.h> |
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#include <linux/ioport.h> |
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#include <linux/serial_core.h> |
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#include <linux/serial_s3c.h> |
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#include <linux/platform_device.h> |
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#include <linux/of.h> |
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#include <asm/mach/arch.h> |
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#include <asm/mach/map.h> |
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#include "cpu.h" |
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#include "devs.h" |
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static struct cpu_table *cpu; |
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static struct cpu_table * __init s3c_lookup_cpu(unsigned long idcode, |
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struct cpu_table *tab, |
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unsigned int count) |
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{ |
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for (; count != 0; count--, tab++) { |
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if ((idcode & tab->idmask) == (tab->idcode & tab->idmask)) |
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return tab; |
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} |
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return NULL; |
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} |
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void __init s3c_init_cpu(unsigned long idcode, |
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struct cpu_table *cputab, unsigned int cputab_size) |
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{ |
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cpu = s3c_lookup_cpu(idcode, cputab, cputab_size); |
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if (cpu == NULL) { |
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printk(KERN_ERR "Unknown CPU type 0x%08lx\n", idcode); |
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panic("Unknown S3C24XX CPU"); |
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} |
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printk("CPU %s (id 0x%08lx)\n", cpu->name, idcode); |
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if (cpu->init == NULL) { |
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printk(KERN_ERR "CPU %s support not enabled\n", cpu->name); |
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panic("Unsupported Samsung CPU"); |
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} |
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if (cpu->map_io) |
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cpu->map_io(); |
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} |
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/* s3c24xx_init_clocks |
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* |
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* Initialise the clock subsystem and associated information from the |
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* given master crystal value. |
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* |
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* xtal = 0 -> use default PLL crystal value (normally 12MHz) |
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* != 0 -> PLL crystal value in Hz |
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*/ |
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void __init s3c24xx_init_clocks(int xtal) |
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{ |
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if (xtal == 0) |
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xtal = 12*1000*1000; |
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if (cpu == NULL) |
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panic("s3c24xx_init_clocks: no cpu setup?\n"); |
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if (cpu->init_clocks == NULL) |
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panic("s3c24xx_init_clocks: cpu has no clock init\n"); |
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else |
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(cpu->init_clocks)(xtal); |
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} |
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/* uart management */ |
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#if IS_ENABLED(CONFIG_SAMSUNG_ATAGS) |
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static int nr_uarts __initdata = 0; |
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#ifdef CONFIG_SERIAL_SAMSUNG_UARTS |
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static struct s3c2410_uartcfg uart_cfgs[CONFIG_SERIAL_SAMSUNG_UARTS]; |
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#endif |
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/* s3c24xx_init_uartdevs |
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* |
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* copy the specified platform data and configuration into our central |
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* set of devices, before the data is thrown away after the init process. |
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* |
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* This also fills in the array passed to the serial driver for the |
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* early initialisation of the console. |
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*/ |
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void __init s3c24xx_init_uartdevs(char *name, |
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struct s3c24xx_uart_resources *res, |
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struct s3c2410_uartcfg *cfg, int no) |
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{ |
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#ifdef CONFIG_SERIAL_SAMSUNG_UARTS |
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struct platform_device *platdev; |
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struct s3c2410_uartcfg *cfgptr = uart_cfgs; |
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struct s3c24xx_uart_resources *resp; |
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int uart; |
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memcpy(cfgptr, cfg, sizeof(struct s3c2410_uartcfg) * no); |
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for (uart = 0; uart < no; uart++, cfg++, cfgptr++) { |
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platdev = s3c24xx_uart_src[cfgptr->hwport]; |
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resp = res + cfgptr->hwport; |
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s3c24xx_uart_devs[uart] = platdev; |
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platdev->name = name; |
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platdev->resource = resp->resources; |
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platdev->num_resources = resp->nr_resources; |
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platdev->dev.platform_data = cfgptr; |
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} |
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nr_uarts = no; |
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#endif |
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} |
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void __init s3c24xx_init_uarts(struct s3c2410_uartcfg *cfg, int no) |
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{ |
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if (cpu == NULL) |
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return; |
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if (cpu->init_uarts == NULL && IS_ENABLED(CONFIG_SAMSUNG_ATAGS)) { |
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printk(KERN_ERR "s3c24xx_init_uarts: cpu has no uart init\n"); |
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} else |
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(cpu->init_uarts)(cfg, no); |
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} |
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#endif |
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static int __init s3c_arch_init(void) |
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{ |
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int ret; |
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/* init is only needed for ATAGS based platforms */ |
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if (!IS_ENABLED(CONFIG_ATAGS) || |
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(!soc_is_s3c24xx() && !soc_is_s3c64xx())) |
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return 0; |
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// do the correct init for cpu |
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if (cpu == NULL) { |
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/* Not needed when booting with device tree. */ |
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if (of_have_populated_dt()) |
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return 0; |
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panic("s3c_arch_init: NULL cpu\n"); |
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} |
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ret = (cpu->init)(); |
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if (ret != 0) |
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return ret; |
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#if IS_ENABLED(CONFIG_SAMSUNG_ATAGS) |
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ret = platform_add_devices(s3c24xx_uart_devs, nr_uarts); |
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#endif |
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return ret; |
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} |
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arch_initcall(s3c_arch_init);
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