patch-2.4.9 linux/arch/arm/mach-sa1100/assabet.c

• Lines: 309
• Date: Sun Aug 12 17:36:24 2001
• Orig file: v2.4.8/linux/arch/arm/mach-sa1100/assabet.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.4.8/linux/arch/arm/mach-sa1100/assabet.c linux/arch/arm/mach-sa1100/assabet.c
@@ -0,0 +1,308 @@
+/*
+ * linux/arch/arm/mach-sa1100/assabet.c
+ *
+ * Author: Nicolas Pitre
+ *
+ * This file contains all Assabet-specific tweaks.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/config.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/sched.h>
+#include <linux/tty.h>
+#include <linux/module.h>
+#include <linux/errno.h>
+
+#include <asm/hardware.h>
+#include <asm/setup.h>
+#include <asm/page.h>
+#include <asm/pgtable.h>
+
+#include <asm/mach/arch.h>
+#include <asm/mach/map.h>
+#include <asm/mach/serial_sa1100.h>
+#include <linux/serial_core.h>
+
+#include "generic.h"
+
+
+unsigned long BCR_value = BCR_DB1110;
+unsigned long SCR_value = SCR_INIT;
+EXPORT_SYMBOL(BCR_value);
+EXPORT_SYMBOL(SCR_value);
+
+
+static int __init assabet_init(void)
+{
+	if (machine_is_assabet() && machine_has_neponset()) {
+		/*
+		 * Angel sets this, but other bootloaders may not.
+		 *
+		 * This must precede any driver calls to BCR_set()
+		 * or BCR_clear().
+		 */
+		BCR = BCR_value = BCR_DB1111;
+
+#ifndef CONFIG_ASSABET_NEPONSET
+		printk( "Warning: Neponset detected but full support "
+			"hasn't been configured in the kernel\n" );
+#endif
+	}
+	return 0;
+}
+
+__initcall(assabet_init);
+
+
+/*
+ * On Assabet, we must probe for the Neponset board _before_
+ * paging_init() has occurred to actually determine the amount
+ * of RAM available.  To do so, we map the appropriate IO section
+ * in the page table here in order to access GPIO registers.
+ */
+static void __init map_sa1100_gpio_regs( void )
+{
+	unsigned long phys = _GPLR & PMD_MASK;
+	unsigned long virt = io_p2v(phys);
+	int prot = PMD_TYPE_SECT | PMD_SECT_AP_WRITE | PMD_DOMAIN(DOMAIN_IO);
+	pmd_t pmd;
+	pmd_val(pmd) = phys | prot;
+	set_pmd(pmd_offset(pgd_offset_k(virt), virt), pmd);
+}
+
+/*
+ * Read System Configuration "Register"
+ * (taken from "Intel StrongARM SA-1110 Microprocessor Development Board
+ * User's Guide", section 4.4.1)
+ *
+ * This same scan is performed in arch/arm/boot/compressed/head-sa1100.S
+ * to set up the serial port for decompression status messages. We
+ * repeat it here because the kernel may not be loaded as a zImage, and
+ * also because it's a hassle to communicate the SCR value to the kernel
+ * from the decompressor.
+ */
+static void __init get_assabet_scr(void)
+{
+	unsigned long flags, scr, i;
+
+	local_irq_save(flags);
+	GPDR |= 0x3fc;			/* Configure GPIO 9:2 as outputs */
+	GPSR = 0x3fc;			/* Write 0xFF to GPIO 9:2 */
+	GPDR &= ~(0x3fc);		/* Configure GPIO 9:2 as inputs */
+	for(i = 100; i--; scr = GPLR);	/* Read GPIO 9:2 */
+	GPDR |= 0x3fc;			/*  restore correct pin direction */
+	local_irq_restore(flags);
+	scr &= 0x3fc;			/* save as system configuration byte. */
+	SCR_value = scr;
+}
+
+static void __init
+fixup_assabet(struct machine_desc *desc, struct param_struct *params,
+	      char **cmdline, struct meminfo *mi)
+{
+	struct tag *t = (struct tag *)params;
+
+	/* This must be done before any call to machine_has_neponset() */
+	map_sa1100_gpio_regs();
+	get_assabet_scr();
+
+	if (machine_has_neponset())
+		printk("Neponset expansion board detected\n");
+
+	if (t->hdr.tag != ATAG_CORE) {
+		t->hdr.tag = ATAG_CORE;
+		t->hdr.size = tag_size(tag_core);
+		t->u.core.flags = 0;
+		t->u.core.pagesize = PAGE_SIZE;
+		t->u.core.rootdev = RAMDISK_MAJOR << 8 | 0;
+		t = tag_next(t);
+
+		t->hdr.tag = ATAG_MEM;
+		t->hdr.size = tag_size(tag_mem32);
+		t->u.mem.start = 0xc0000000;
+		t->u.mem.size  = 32 * 1024 * 1024;
+		t = tag_next(t);
+
+
+		/*
+		 * Note that Neponset RAM is slower...
+		 * and still untested.
+		 * This would be a candidate for
+		 * _real_ NUMA support.
+		 */
+		if (machine_has_neponset() && 0) {
+			t->hdr.tag = ATAG_MEM;
+			t->hdr.size = tag_size(tag_mem32);
+			t->u.mem.start = 0xd0000000;
+			t->u.mem.size  = 32 * 1024 * 1024;
+			t = tag_next(t);
+		}
+
+		t->hdr.tag = ATAG_RAMDISK;
+		t->hdr.size = tag_size(tag_ramdisk);
+		t->u.ramdisk.flags = 1;
+		t->u.ramdisk.size = 8192;
+		t->u.ramdisk.start = 0;
+		t = tag_next(t);
+
+		t->hdr.tag = ATAG_INITRD;
+		t->hdr.size = tag_size(tag_initrd);
+		t->u.initrd.start = 0xc0800000;
+		t->u.initrd.size = 3 * 1024 * 1024;
+		t = tag_next(t);
+
+		t->hdr.tag = ATAG_NONE;
+		t->hdr.size = 0;
+	}
+}
+
+
+static struct map_desc assabet_io_desc[] __initdata = {
+ /* virtual     physical    length      domain     r  w  c  b */
+  { 0xe8000000, 0x00000000, 0x02000000, DOMAIN_IO, 1, 1, 0, 0 }, /* Flash bank 0 */
+  { 0xf1000000, 0x12000000, 0x00100000, DOMAIN_IO, 1, 1, 0, 0 }, /* Board Control Register */
+  { 0xf2800000, 0x4b800000, 0x00800000, DOMAIN_IO, 1, 1, 0, 0 }, /* MQ200 */
+  /*  f3000000 - neponset system registers */
+  /*  f4000000 - neponset SA1111 registers */
+  LAST_DESC
+};
+
+static void assabet_uart_pm(struct uart_port *port, u_int state, u_int oldstate)
+{
+	if (port->mapbase == _Ser1UTCR0) {
+		if (state)
+			BCR_clear(BCR_RS232EN);
+		else
+			BCR_set(BCR_RS232EN);
+	}
+}
+
+/*
+ * Note! this can be called from IRQ context.
+ * FIXME: You _need_ to handle BCR carefully, which doesn't
+ * happen at the moment.  Suggest putting interrupt save/restore
+ * in BCR_set/clear.
+ *
+ * NB: Assabet uses COM_RTS and COM_DTR for both UART1 (com port)
+ * and UART3 (radio module).  We only handle them for UART1 here.
+ */
+static void assabet_set_mctrl(struct uart_port *port, u_int mctrl)
+{
+	if (port->mapbase == _Ser1UTCR0) {
+		u_int set = 0, clear = 0;
+
+		if (mctrl & TIOCM_RTS)
+			set |= BCR_COM_RTS;
+		else
+			clear |= BCR_COM_RTS;
+
+		if (mctrl & TIOCM_DTR)
+			set |= BCR_COM_DTR;
+		else
+			clear |= BCR_COM_DTR;
+
+		BCR_clear(clear);
+		BCR_set(set);
+	}
+}
+
+static int assabet_get_mctrl(struct uart_port *port)
+{
+	u_int ret = 0;
+	u_int bsr = BSR;
+
+	/* need 2 reads to read current value */
+	bsr = BSR;
+
+	if (port->mapbase == _Ser1UTCR0) {
+		if (bsr & BSR_COM_DCD)
+			ret |= TIOCM_CD;
+		if (bsr & BSR_COM_CTS)
+			ret |= TIOCM_CTS;
+		if (bsr & BSR_COM_DSR)
+			ret |= TIOCM_DSR;
+	} else if (port->mapbase == _Ser3UTCR0) {
+		if (bsr & BSR_RAD_DCD)
+			ret |= TIOCM_CD;
+		if (bsr & BSR_RAD_CTS)
+			ret |= TIOCM_CTS;
+		if (bsr & BSR_RAD_DSR)
+			ret |= TIOCM_DSR;
+		if (bsr & BSR_RAD_RI)
+			ret |= TIOCM_RI;
+	} else {
+		ret = TIOCM_CD | TIOCM_CTS | TIOCM_DSR;
+	}
+
+	return ret;
+}
+
+static struct sa1100_port_fns assabet_port_fns __initdata = {
+	set_mctrl:	assabet_set_mctrl,
+	get_mctrl:	assabet_get_mctrl,
+	pm:		assabet_uart_pm,
+};
+
+static void __init assabet_map_io(void)
+{
+	extern void neponset_map_io(void);
+
+	sa1100_map_io();
+	iotable_init(assabet_io_desc);
+
+#ifdef CONFIG_ASSABET_NEPONSET
+	/*
+	 * We map Neponset registers even if it isn't present since
+	 * many drivers will try to probe their stuff (and fail).
+	 * This is still more friendly than a kernel paging request
+	 * crash.
+	 */
+	neponset_map_io();
+#endif
+
+	sa1100_register_uart(1, 2);
+	if (machine_has_neponset()) {
+		/*
+		 * When Neponset is attached, the first UART should be
+		 * UART3.  That's what Angel is doing and many documents
+		 * are stating this.
+		 * We do the Neponset mapping even if Neponset support
+		 * isn't compiled in so the user will still get something on
+		 * the expected physical serial port.
+		 */
+		sa1100_register_uart(0, 3);
+		sa1100_register_uart(2, 1);
+		/*
+		 * Set SUS bit in SDCR0 so serial port 1 functions.
+		 * Its called GPCLKR0 in my SA1110 manual.
+		 */
+		Ser1SDCR0 |= SDCR0_SUS;
+	} else {
+		sa1100_register_uart_fns(&assabet_port_fns);
+		sa1100_register_uart(0, 1);	/* com port */
+		sa1100_register_uart(2, 3);	/* radio module */
+	}
+
+	/*
+	 * Ensure that these pins are set as outputs and are driving
+	 * logic 0.  This ensures that we won't inadvertently toggle
+	 * the WS latch in the CPLD, and we don't float causing
+	 * excessive power drain.  --rmk
+	 */
+	GPDR |= GPIO_SSP_TXD | GPIO_SSP_SCLK | GPIO_SSP_SFRM;
+	GPCR |= GPIO_SSP_TXD | GPIO_SSP_SCLK | GPIO_SSP_SFRM;
+}
+
+
+MACHINE_START(ASSABET, "Intel-Assabet")
+	BOOT_MEM(0xc0000000, 0x80000000, 0xf8000000)
+	BOOT_PARAMS(0xc0000100)
+	FIXUP(fixup_assabet)
+	MAPIO(assabet_map_io)
+	INITIRQ(sa1100_init_irq)
+MACHINE_END