assabet.c
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上传日期:2013-04-10
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文件大小:9k
- /*
- * 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 <linux/serial_core.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 <asm/arch/assabet.h>
- #include "generic.h"
- #define ASSABET_BCR_DB1110
- (ASSABET_BCR_SPK_OFF | ASSABET_BCR_QMUTE |
- ASSABET_BCR_LED_GREEN | ASSABET_BCR_LED_RED |
- ASSABET_BCR_RS232EN | ASSABET_BCR_LCD_12RGB |
- ASSABET_BCR_IRDA_MD0)
- #define ASSABET_BCR_DB1111
- (ASSABET_BCR_SPK_OFF | ASSABET_BCR_QMUTE |
- ASSABET_BCR_LED_GREEN | ASSABET_BCR_LED_RED |
- ASSABET_BCR_RS232EN | ASSABET_BCR_LCD_12RGB |
- ASSABET_BCR_CF_BUS_OFF | ASSABET_BCR_STEREO_LB |
- ASSABET_BCR_IRDA_MD0 | ASSABET_BCR_CF_RST)
- unsigned long SCR_value = ASSABET_SCR_INIT;
- EXPORT_SYMBOL(SCR_value);
- static unsigned long BCR_value = ASSABET_BCR_DB1110;
- void ASSABET_BCR_frob(unsigned int mask, unsigned int val)
- {
- unsigned long flags;
- local_irq_save(flags);
- BCR_value = (BCR_value & ~mask) | val;
- ASSABET_BCR = BCR_value;
- local_irq_restore(flags);
- }
- EXPORT_SYMBOL(ASSABET_BCR_frob);
- static int __init assabet_init(void)
- {
- if (!machine_is_assabet())
- return -EINVAL;
- /*
- * Set the IRQ edges
- */
- set_GPIO_IRQ_edge(GPIO_GPIO23, GPIO_RISING_EDGE); /* UCB1300 */
- if (machine_has_neponset()) {
- /*
- * Angel sets this, but other bootloaders may not.
- *
- * This must precede any driver calls to BCR_set()
- * or BCR_clear().
- */
- ASSABET_BCR = BCR_value = ASSABET_BCR_DB1111;
- NCR_0 = 0;
- #ifndef CONFIG_ASSABET_NEPONSET
- printk( "Warning: Neponset detected but full support "
- "hasn't been configured in the kerneln" );
- #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 = __PREG(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.
- *
- * Note that IRQs are guaranteed to be disabled.
- */
- static void __init get_assabet_scr(void)
- {
- unsigned long scr, i;
- 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 */
- scr &= 0x3fc; /* save as system configuration byte. */
- SCR_value = scr;
- }
- extern void convert_to_tag_list(struct param_struct *params, int mem_init);
- 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 detectedn");
- /*
- * Apparantly bootldr uses a param_struct. Groan.
- */
- if (t->hdr.tag != ATAG_CORE)
- convert_to_tag_list(params, 1);
- 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, 0, 1, 0, 0 }, /* Flash bank 0 */
- { 0xf1000000, 0x12000000, 0x00100000, DOMAIN_IO, 0, 1, 0, 0 }, /* Board Control Register */
- { 0xf2800000, 0x4b800000, 0x00800000, DOMAIN_IO, 0, 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)
- ASSABET_BCR_clear(ASSABET_BCR_RS232EN |
- ASSABET_BCR_COM_RTS |
- ASSABET_BCR_COM_DTR);
- else
- ASSABET_BCR_set(ASSABET_BCR_RS232EN |
- ASSABET_BCR_COM_RTS |
- ASSABET_BCR_COM_DTR);
- }
- }
- /*
- * 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)
- clear |= ASSABET_BCR_COM_RTS;
- else
- set |= ASSABET_BCR_COM_RTS;
- if (mctrl & TIOCM_DTR)
- clear |= ASSABET_BCR_COM_DTR;
- else
- set |= ASSABET_BCR_COM_DTR;
- ASSABET_BCR_clear(clear);
- ASSABET_BCR_set(set);
- }
- }
- static u_int assabet_get_mctrl(struct uart_port *port)
- {
- u_int ret = 0;
- u_int bsr = ASSABET_BSR;
- /* need 2 reads to read current value */
- bsr = ASSABET_BSR;
- if (port->mapbase == _Ser1UTCR0) {
- if (bsr & ASSABET_BSR_COM_DCD)
- ret |= TIOCM_CD;
- if (bsr & ASSABET_BSR_COM_CTS)
- ret |= TIOCM_CTS;
- if (bsr & ASSABET_BSR_COM_DSR)
- ret |= TIOCM_DSR;
- } else if (port->mapbase == _Ser3UTCR0) {
- if (bsr & ASSABET_BSR_RAD_DCD)
- ret |= TIOCM_CD;
- if (bsr & ASSABET_BSR_RAD_CTS)
- ret |= TIOCM_CTS;
- if (bsr & ASSABET_BSR_RAD_DSR)
- ret |= TIOCM_DSR;
- if (bsr & ASSABET_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
- 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;
- /*
- * Set up registers for sleep mode.
- */
- PWER = PWER_GPIO0;
- PGSR = 0;
- PCFR = 0;
- PSDR = 0;
- }
- 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