Merge tag 'samsung-soc-s3c-5.10' of https://git.kernel.org/pub/scm/linux/kernel/git/krzk/linux into arm/soc

Samsung S3C24xx and S3C64xx machine code cleanup for v5.10

Big cleanup for the Samsung S3C24xx and S3C64xx platforms, although it
also touches files shared with S5Pv210 and Exynos.  This is mostly Arnd
Bergmann work which Krzysztof Kozlowski took over, rebased and polished.

The goal is to cleanup, merge and finally make the Samsung S3C24xx and
S3C64xx architectures multiplatform.  The multiplatform did not happen
yet here - just cleaning up and merging into one arch/arm/mach-s3c
directory.  However this is step forward for multiplatform or at least
to keep this code still maintainable.

This pulls also branch with changes for Samsung SoC sound drivers from
broonie/sound because the cleanups there were part of this series and
all further patches depend on them.

* tag 'samsung-soc-s3c-5.10' of https://git.kernel.org/pub/scm/linux/kernel/git/krzk/linux: (62 commits)
  ARM: s3c: Avoid naming clash of S3C24xx and S3C64xx timer setup
  ARM: s3c: Cleanup from old plat-samsung include
  ARM: s3c: make headers local if possible
  ARM: s3c: move into a common directory
  ARM: s3c24xx: stop including mach/hardware.h from mach/io.h
  cpufreq: s3c24xx: move low-level clk reg access into platform code
  cpufreq: s3c2412: use global s3c2412_cpufreq_setrefresh
  ARM: s3c: remove cpufreq header dependencies
  cpufreq: s3c24xx: split out registers
  fbdev: s3c2410fb: remove mach header dependency
  ARM: s3c24xx: bast: avoid irq_desc array usage
  ARM: s3c24xx: spi: avoid hardcoding fiq number in driver
  ARM: s3c24xx: include mach/irqs.h where needed
  ARM: s3c24xx: move s3cmci pinctrl handling into board files
  ARM: s3c24xx: move iis pinctrl config into boards
  ARM: s3c24xx: move spi fiq handler into platform
  ARM: s3c: adc: move header to linux/soc/samsung
  ARM: s3c24xx: move irqchip driver back into platform
  ARM: s3c24xx: move regs-spi.h into spi driver
  ARM: s3c64xx: remove mach/hardware.h
  ...

Link: https://lore.kernel.org/r/20200831154751.7551-1-krzk@kernel.org
Signed-off-by: Olof Johansson <olof@lixom.net>

1 files changed, 173 insertions, 0 deletions

diff --git a/arch/arm/mach-s3c/init.c b/arch/arm/mach-s3c/init.c
new file mode 100644
index 000000000000..9d92f03e9bc1
--- /dev/null
+++ b/arch/arm/mach-s3c/init.c
@@ -0,0 +1,173 @@
+// SPDX-License-Identifier: GPL-2.0
+//
+// Copyright (c) 2008 Simtec Electronics
+//	Ben Dooks <ben@simtec.co.uk>
+//	http://armlinux.simtec.co.uk/
+//
+// S3C series CPU initialisation
+
+/*
+ * NOTE: Code in this file is not used on S3C64xx when booting with
+ * Device Tree support.
+ */
+
+#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/of.h>
+
+#include <asm/mach/arch.h>
+#include <asm/mach/map.h>
+
+#include "cpu.h"
+#include "devs.h"
+
+static struct cpu_table *cpu;
+
+static struct cpu_table * __init s3c_lookup_cpu(unsigned long idcode,
+						struct cpu_table *tab,
+						unsigned int count)
+{
+	for (; count != 0; count--, tab++) {
+		if ((idcode & tab->idmask) == (tab->idcode & tab->idmask))
+			return tab;
+	}
+
+	return NULL;
+}
+
+void __init s3c_init_cpu(unsigned long idcode,
+			 struct cpu_table *cputab, unsigned int cputab_size)
+{
+	cpu = s3c_lookup_cpu(idcode, cputab, cputab_size);
+
+	if (cpu == NULL) {
+		printk(KERN_ERR "Unknown CPU type 0x%08lx\n", idcode);
+		panic("Unknown S3C24XX CPU");
+	}
+
+	printk("CPU %s (id 0x%08lx)\n", cpu->name, idcode);
+
+	if (cpu->init == NULL) {
+		printk(KERN_ERR "CPU %s support not enabled\n", cpu->name);
+		panic("Unsupported Samsung CPU");
+	}
+
+	if (cpu->map_io)
+		cpu->map_io();
+}
+
+/* s3c24xx_init_clocks
+ *
+ * Initialise the clock subsystem and associated information from the
+ * given master crystal value.
+ *
+ * xtal  = 0 -> use default PLL crystal value (normally 12MHz)
+ *      != 0 -> PLL crystal value in Hz
+*/
+
+void __init s3c24xx_init_clocks(int xtal)
+{
+	if (xtal == 0)
+		xtal = 12*1000*1000;
+
+	if (cpu == NULL)
+		panic("s3c24xx_init_clocks: no cpu setup?\n");
+
+	if (cpu->init_clocks == NULL)
+		panic("s3c24xx_init_clocks: cpu has no clock init\n");
+	else
+		(cpu->init_clocks)(xtal);
+}
+
+/* uart management */
+#if IS_ENABLED(CONFIG_SAMSUNG_ATAGS)
+static int nr_uarts __initdata = 0;
+
+#ifdef CONFIG_SERIAL_SAMSUNG_UARTS
+static struct s3c2410_uartcfg uart_cfgs[CONFIG_SERIAL_SAMSUNG_UARTS];
+#endif
+
+/* s3c24xx_init_uartdevs
+ *
+ * copy the specified platform data and configuration into our central
+ * set of devices, before the data is thrown away after the init process.
+ *
+ * This also fills in the array passed to the serial driver for the
+ * early initialisation of the console.
+*/
+
+void __init s3c24xx_init_uartdevs(char *name,
+				  struct s3c24xx_uart_resources *res,
+				  struct s3c2410_uartcfg *cfg, int no)
+{
+#ifdef CONFIG_SERIAL_SAMSUNG_UARTS
+	struct platform_device *platdev;
+	struct s3c2410_uartcfg *cfgptr = uart_cfgs;
+	struct s3c24xx_uart_resources *resp;
+	int uart;
+
+	memcpy(cfgptr, cfg, sizeof(struct s3c2410_uartcfg) * no);
+
+	for (uart = 0; uart < no; uart++, cfg++, cfgptr++) {
+		platdev = s3c24xx_uart_src[cfgptr->hwport];
+
+		resp = res + cfgptr->hwport;
+
+		s3c24xx_uart_devs[uart] = platdev;
+
+		platdev->name = name;
+		platdev->resource = resp->resources;
+		platdev->num_resources = resp->nr_resources;
+
+		platdev->dev.platform_data = cfgptr;
+	}
+
+	nr_uarts = no;
+#endif
+}
+
+void __init s3c24xx_init_uarts(struct s3c2410_uartcfg *cfg, int no)
+{
+	if (cpu == NULL)
+		return;
+
+	if (cpu->init_uarts == NULL && IS_ENABLED(CONFIG_SAMSUNG_ATAGS)) {
+		printk(KERN_ERR "s3c24xx_init_uarts: cpu has no uart init\n");
+	} else
+		(cpu->init_uarts)(cfg, no);
+}
+#endif
+
+static int __init s3c_arch_init(void)
+{
+	int ret;
+
+	/* init is only needed for ATAGS based platforms */
+	if (!IS_ENABLED(CONFIG_ATAGS) ||
+	    (!soc_is_s3c24xx() && !soc_is_s3c64xx()))
+		return 0;
+
+	// do the correct init for cpu
+
+	if (cpu == NULL) {
+		/* Not needed when booting with device tree. */
+		if (of_have_populated_dt())
+			return 0;
+		panic("s3c_arch_init: NULL cpu\n");
+	}
+
+	ret = (cpu->init)();
+	if (ret != 0)
+		return ret;
+#if IS_ENABLED(CONFIG_SAMSUNG_ATAGS)
+	ret = platform_add_devices(s3c24xx_uart_devs, nr_uarts);
+#endif
+	return ret;
+}
+
+arch_initcall(s3c_arch_init);