system3.c
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上传日期:2013-04-10
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- /*
- * linux/arch/arm/mach-sa1100/system3.c
- *
- * Copyright (C) 2001 Stefan Eletzhofer <stefan.eletzhofer@eletztrick.de>
- *
- * $Id: system3.c,v 1.1.6.1 2001/12/04 17:28:06 seletz Exp $
- *
- * This file contains all PT Sytsem 3 tweaks. Based on original work from
- * Nicolas Pitre's assabet fixes
- *
- * 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.
- *
- * $Log: system3.c,v $
- * Revision 1.1.6.1 2001/12/04 17:28:06 seletz
- * - merged from previous branch
- *
- * Revision 1.1.4.3 2001/12/04 15:16:31 seletz
- * - merged from linux_2_4_13_ac5_rmk2
- *
- * Revision 1.1.4.2 2001/11/19 17:18:57 seletz
- * - more code cleanups
- *
- * Revision 1.1.4.1 2001/11/16 13:52:05 seletz
- * - PT Digital Board Support Code
- *
- * Revision 1.1.2.2 2001/11/05 16:46:18 seletz
- * - cleanups
- *
- * Revision 1.1.2.1 2001/10/15 16:00:43 seletz
- * - first revision working with new board
- *
- *
- */
- #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 <linux/cpufreq.h>
- #include <asm/hardware.h>
- #include <asm/setup.h>
- #include <asm/page.h>
- #include <asm/pgtable.h>
- #include <asm/irq.h>
- #include <asm/mach/arch.h>
- #include <asm/mach/map.h>
- #include <asm/mach/irq.h>
- #include <asm/mach/serial_sa1100.h>
- #include <asm/arch/irq.h>
- #include <linux/serial_core.h>
- #include "generic.h"
- #include "sa1111.h"
- #define DEBUG 1
- #ifdef DEBUG
- # define DPRINTK( x, args... ) printk( "%s: line %d: "x, __FUNCTION__, __LINE__, ## args );
- #else
- # define DPRINTK( x, args... ) /* nix */
- #endif
- /**********************************************************************
- * prototypes
- */
- /* init funcs */
- static void __init fixup_system3(struct machine_desc *desc,
- struct param_struct *params, char **cmdline, struct meminfo *mi);
- static void __init get_system3_scr(void);
- static int __init system3_init(void);
- static void __init system3_init_irq(void);
- static void __init system3_map_io(void);
- static void system3_IRQ_demux( int irq, void *dev_id, struct pt_regs *regs );
- static int system3_get_mctrl(struct uart_port *port);
- static void system3_set_mctrl(struct uart_port *port, u_int mctrl);
- static void system3_uart_pm(struct uart_port *port, u_int state, u_int oldstate);
- static int sdram_notifier(struct notifier_block *nb, unsigned long event, void *data);
- extern void convert_to_tag_list(struct param_struct *params, int mem_init);
- /**********************************************************************
- * global data
- */
- /**********************************************************************
- * static data
- */
- static struct map_desc system3_io_desc[] __initdata = {
- /* virtual physical length domain r w c b */
- { 0xe8000000, 0x00000000, 0x01000000, DOMAIN_IO, 0, 1, 0, 0 }, /* Flash bank 0 */
- { 0xf3000000, 0x10000000, 0x00100000, DOMAIN_IO, 0, 1, 0, 0 }, /* System Registers */
- { 0xf4000000, 0x40000000, 0x00100000, DOMAIN_IO, 0, 1, 0, 0 }, /* SA-1111 */
- LAST_DESC
- };
- static struct sa1100_port_fns system3_port_fns __initdata = {
- set_mctrl: system3_set_mctrl,
- get_mctrl: system3_get_mctrl,
- pm: system3_uart_pm,
- };
- static struct irqaction system3_irq = {
- name: "PT Digital Board SA1111 IRQ",
- handler: system3_IRQ_demux,
- flags: SA_INTERRUPT
- };
- static struct notifier_block system3_clkchg_block = {
- notifier_call: sdram_notifier,
- };
- /**********************************************************************
- * Static functions
- */
- static void __init system3_map_io(void)
- {
- DPRINTK( "%sn", "START" );
- sa1100_map_io();
- iotable_init(system3_io_desc);
- sa1100_register_uart_fns(&system3_port_fns);
- sa1100_register_uart(0, 1); /* com port */
- sa1100_register_uart(1, 2);
- sa1100_register_uart(2, 3); /* radio module */
- Ser1SDCR0 |= SDCR0_SUS;
- }
- /*********************************************************************
- * Install IRQ handler
- */
- static void system3_IRQ_demux( int irq, void *dev_id, struct pt_regs *regs )
- {
- u_char irr;
- for(;;){
- //irr = PTCPLD_REG_IRQSR & (PT_IRQ_LAN | PT_IRQ_USAR | PT_IRQ_SA1111);
- irr = PT_IRQSR & (PT_IRQ_LAN | PT_IRQ_SA1111);
- irr ^= (PT_IRQ_LAN);
- if (!irr) break;
- if( irr & PT_IRQ_LAN )
- do_IRQ(IRQ_SYSTEM3_SMC9196, regs);
- #if 0
- /* Highspeed Serial Bus not yet used */
- if( irr & PT_IRQ_USAR )
- do_IRQ(PT_USAR_IRQ, regs);
- #endif
- if( irr & PT_IRQ_SA1111 )
- sa1111_IRQ_demux(irq, dev_id, regs);
- }
- }
- static void __init system3_init_irq(void)
- {
- int irq;
- DPRINTK( "%sn", "START" );
- /* SA1111 IRQ not routed to a GPIO. */
- sa1111_init_irq(-1);
- /* setup extra IRQs */
- irq = IRQ_SYSTEM3_SMC9196;
- irq_desc[irq].valid = 1;
- irq_desc[irq].probe_ok = 1;
- #if 0
- /* Highspeed Serial Bus not yet used */
- irq = PT_USAR_IRQ;
- irq_desc[irq].valid = 1;
- irq_desc[irq].probe_ok = 1;
- #endif
- /* IRQ by CPLD */
- set_GPIO_IRQ_edge( GPIO_GPIO(25), GPIO_RISING_EDGE );
- setup_arm_irq( IRQ_GPIO25, &system3_irq );
- }
- /**********************************************************************
- * On system 3 limit cpu frequency to 206 Mhz
- */
- static int sdram_notifier(struct notifier_block *nb, unsigned long event,
- void *data)
- {
- switch (event) {
- case CPUFREQ_MINMAX:
- cpufreq_updateminmax(data, 147500, 206000);
- break;
- }
- return 0;
- }
- /**
- * fixup_system3 - fixup function for system 3 board
- * @desc: machine description
- * @param: kernel params
- * @cmdline: kernel cmdline
- * @mi: memory info struct
- *
- */
- static void __init fixup_system3(struct machine_desc *desc,
- struct param_struct *params, char **cmdline, struct meminfo *mi)
- {
- DPRINTK( "%sn", "START" );
- ROOT_DEV = MKDEV(RAMDISK_MAJOR,0);
- setup_ramdisk( 1, 0, 0, 8192 );
- setup_initrd( 0xc0800000, 8*1024*1024 );
- }
- /**
- * system3_uart_pm - powermgmt callback function for system 3 UART
- * @port: uart port structure
- * @state: pm state
- * @oldstate: old pm state
- *
- */
- static void system3_uart_pm(struct uart_port *port, u_int state, u_int oldstate)
- {
- /* TODO: switch on/off uart in powersave mode */
- }
- /*
- * Note! this can be called from IRQ context.
- * FIXME: Handle PT Digital Board CTRL regs irq-safe.
- *
- * NB: system3 uses COM_RTS and COM_DTR for both UART1 (com port)
- * and UART3 (radio module). We only handle them for UART1 here.
- */
- static void system3_set_mctrl(struct uart_port *port, u_int mctrl)
- {
- if (port->mapbase == _Ser1UTCR0) {
- u_int set = 0, clear = 0;
- if (mctrl & TIOCM_RTS)
- set |= PT_CTRL2_RS1_RTS;
- else
- clear |= PT_CTRL2_RS1_RTS;
- if (mctrl & TIOCM_DTR)
- set |= PT_CTRL2_RS1_DTR;
- else
- clear |= PT_CTRL2_RS1_DTR;
- PTCTRL2_clear(clear);
- PTCTRL2_set(set);
- }
- }
- static int system3_get_mctrl(struct uart_port *port)
- {
- u_int ret = 0;
- u_int irqsr = PT_IRQSR;
- /* need 2 reads to read current value */
- irqsr = PT_IRQSR;
- /* TODO: check IRQ source register for modem/com
- status lines and set them correctly. */
- ret = TIOCM_CD | TIOCM_CTS | TIOCM_DSR;
- return ret;
- }
- static int __init system3_init(void)
- {
- int ret = 0;
- DPRINTK( "%sn", "START" );
- if ( !machine_is_pt_system3() ) {
- ret = -EINVAL;
- goto DONE;
- }
- /* init control register */
- PT_CTRL0 = PT_CTRL0_INIT;
- PT_CTRL1 = 0x02;
- PT_CTRL2 = 0x00;
- DPRINTK( "CTRL[0]=0x%02xn", PT_CTRL0 );
- DPRINTK( "CTRL[1]=0x%02xn", PT_CTRL1 );
- DPRINTK( "CTRL[2]=0x%02xn", PT_CTRL2 );
- /*
- * Ensure that the memory bus request/grant signals are setup,
- * and the grant is held in its inactive state.
- */
- sa1110_mb_disable();
- /*
- * Probe for a SA1111.
- */
- ret = sa1111_probe(PT_SA1111_BASE);
- if (ret < 0) {
- printk( KERN_WARNING"PT Digital Board: no SA1111 found!n" );
- goto DONE;
- }
- /*
- * We found it. Wake the chip up.
- */
- sa1111_wake();
- /*
- * The SDRAM configuration of the SA1110 and the SA1111 must
- * match. This is very important to ensure that SA1111 accesses
- * don't corrupt the SDRAM. Note that this ungates the SA1111's
- * MBGNT signal, so we must have called sa1110_mb_disable()
- * beforehand.
- */
- sa1111_configure_smc(1,
- FExtr(MDCNFG, MDCNFG_SA1110_DRAC0),
- FExtr(MDCNFG, MDCNFG_SA1110_TDL0));
- /*
- * We only need to turn on DCLK whenever we want to use the
- * DMA. It can otherwise be held firmly in the off position.
- */
- SKPCR |= SKPCR_DCLKEN;
- /*
- * Enable the SA1110 memory bus request and grant signals.
- */
- sa1110_mb_enable();
- system3_init_irq();
- #if defined( CONFIG_CPU_FREQ )
- ret = cpufreq_register_notifier(&system3_clkchg_block);
- if ( ret != 0 ) {
- printk( KERN_WARNING"PT Digital Board: could not register clock scale callbackn" );
- goto DONE;
- }
- #endif
- ret = 0;
- DONE:
- DPRINTK( "ret=%dn", ret );
- return ret;
- }
- /**********************************************************************
- * Exported Functions
- */
- /**********************************************************************
- * kernel magic macros
- */
- __initcall(system3_init);
- MACHINE_START(PT_SYSTEM3, "PT System 3")
- BOOT_MEM(0xc0000000, 0x80000000, 0xf8000000)
- BOOT_PARAMS(0xc0000100)
- FIXUP(fixup_system3)
- MAPIO(system3_map_io)
- INITIRQ(sa1100_init_irq)
- MACHINE_END