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-rw-r--r--arch/mips/sni/a20r.c227
1 files changed, 227 insertions, 0 deletions
diff --git a/arch/mips/sni/a20r.c b/arch/mips/sni/a20r.c
new file mode 100644
index 000000000000..31ab80f1befa
--- /dev/null
+++ b/arch/mips/sni/a20r.c
@@ -0,0 +1,227 @@
+/*
+ * A20R specific code
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License. See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * Copyright (C) 2006 Thomas Bogendoerfer (tsbogend@alpha.franken.de)
+ */
+
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/platform_device.h>
+#include <linux/serial_8250.h>
+
+#include <asm/sni.h>
+#include <asm/time.h>
+#include <asm/ds1216.h>
+
+#define PORT(_base,_irq) \
+ { \
+ .iobase = _base, \
+ .irq = _irq, \
+ .uartclk = 1843200, \
+ .iotype = UPIO_PORT, \
+ .flags = UPF_BOOT_AUTOCONF, \
+ }
+
+static struct plat_serial8250_port a20r_data[] = {
+ PORT(0x3f8, 4),
+ PORT(0x2f8, 3),
+ { },
+};
+
+static struct platform_device a20r_serial8250_device = {
+ .name = "serial8250",
+ .id = PLAT8250_DEV_PLATFORM,
+ .dev = {
+ .platform_data = a20r_data,
+ },
+};
+
+static struct resource snirm_82596_rsrc[] = {
+ {
+ .start = 0xb8000000,
+ .end = 0xb8000004,
+ .flags = IORESOURCE_MEM
+ },
+ {
+ .start = 0xb8010000,
+ .end = 0xb8010004,
+ .flags = IORESOURCE_MEM
+ },
+ {
+ .start = 0xbff00000,
+ .end = 0xbff00020,
+ .flags = IORESOURCE_MEM
+ },
+ {
+ .start = 22,
+ .end = 22,
+ .flags = IORESOURCE_IRQ
+ },
+ {
+ .flags = 0x01 /* 16bit mpu port access */
+ }
+};
+
+static struct platform_device snirm_82596_pdev = {
+ .name = "snirm_82596",
+ .num_resources = ARRAY_SIZE(snirm_82596_rsrc),
+ .resource = snirm_82596_rsrc
+};
+
+static struct resource snirm_53c710_rsrc[] = {
+ {
+ .start = 0xb9000000,
+ .end = 0xb90fffff,
+ .flags = IORESOURCE_MEM
+ },
+ {
+ .start = 19,
+ .end = 19,
+ .flags = IORESOURCE_IRQ
+ }
+};
+
+static struct platform_device snirm_53c710_pdev = {
+ .name = "snirm_53c710",
+ .num_resources = ARRAY_SIZE(snirm_53c710_rsrc),
+ .resource = snirm_53c710_rsrc
+};
+
+static struct resource sc26xx_rsrc[] = {
+ {
+ .start = 0xbc070000,
+ .end = 0xbc0700ff,
+ .flags = IORESOURCE_MEM
+ },
+ {
+ .start = 20,
+ .end = 20,
+ .flags = IORESOURCE_IRQ
+ }
+};
+
+static struct platform_device sc26xx_pdev = {
+ .name = "SC26xx",
+ .num_resources = ARRAY_SIZE(sc26xx_rsrc),
+ .resource = sc26xx_rsrc
+};
+
+static u32 a20r_ack_hwint(void)
+{
+ u32 status = read_c0_status();
+
+ write_c0_status (status | 0x00010000);
+ asm volatile(
+ " .set push \n"
+ " .set noat \n"
+ " .set noreorder \n"
+ " lw $1, 0(%0) \n"
+ " sb $0, 0(%1) \n"
+ " sync \n"
+ " lb %1, 0(%1) \n"
+ " b 1f \n"
+ " ori %1, $1, 2 \n"
+ " .align 8 \n"
+ "1: \n"
+ " nop \n"
+ " sw %1, 0(%0) \n"
+ " sync \n"
+ " li %1, 0x20 \n"
+ "2: \n"
+ " nop \n"
+ " bnez %1,2b \n"
+ " addiu %1, -1 \n"
+ " sw $1, 0(%0) \n"
+ " sync \n"
+ ".set pop \n"
+ :
+ : "Jr" (PCIMT_UCONF), "Jr" (0xbc000000));
+ write_c0_status(status);
+
+ return status;
+}
+
+static inline void unmask_a20r_irq(unsigned int irq)
+{
+ set_c0_status(0x100 << (irq - SNI_A20R_IRQ_BASE));
+ irq_enable_hazard();
+}
+
+static inline void mask_a20r_irq(unsigned int irq)
+{
+ clear_c0_status(0x100 << (irq - SNI_A20R_IRQ_BASE));
+ irq_disable_hazard();
+}
+
+static void end_a20r_irq(unsigned int irq)
+{
+ if (!(irq_desc[irq].status & (IRQ_DISABLED | IRQ_INPROGRESS))) {
+ a20r_ack_hwint();
+ unmask_a20r_irq(irq);
+ }
+}
+
+static struct irq_chip a20r_irq_type = {
+ .typename = "A20R",
+ .ack = mask_a20r_irq,
+ .mask = mask_a20r_irq,
+ .mask_ack = mask_a20r_irq,
+ .unmask = unmask_a20r_irq,
+ .end = end_a20r_irq,
+};
+
+/*
+ * hwint 0 receive all interrupts
+ */
+static void a20r_hwint(void)
+{
+ u32 cause, status;
+ int irq;
+
+ clear_c0_status (IE_IRQ0);
+ status = a20r_ack_hwint();
+ cause = read_c0_cause();
+
+ irq = ffs(((cause & status) >> 8) & 0xf8);
+ if (likely(irq > 0))
+ do_IRQ(SNI_A20R_IRQ_BASE + irq - 1);
+ set_c0_status(IE_IRQ0);
+}
+
+void __init sni_a20r_irq_init(void)
+{
+ int i;
+
+ for (i = SNI_A20R_IRQ_BASE + 2 ; i < SNI_A20R_IRQ_BASE + 8; i++)
+ set_irq_chip(i, &a20r_irq_type);
+ sni_hwint = a20r_hwint;
+ change_c0_status(ST0_IM, IE_IRQ0);
+ setup_irq (SNI_A20R_IRQ_BASE + 3, &sni_isa_irq);
+}
+
+void sni_a20r_init(void)
+{
+ ds1216_base = (volatile unsigned char *) SNI_DS1216_A20R_BASE;
+ rtc_mips_get_time = ds1216_get_cmos_time;
+}
+
+static int __init snirm_a20r_setup_devinit(void)
+{
+ switch (sni_brd_type) {
+ case SNI_BRD_TOWER_OASIC:
+ case SNI_BRD_MINITOWER:
+ platform_device_register(&snirm_82596_pdev);
+ platform_device_register(&snirm_53c710_pdev);
+ platform_device_register(&sc26xx_pdev);
+ platform_device_register(&a20r_serial8250_device);
+ break;
+ }
+
+ return 0;
+}
+
+device_initcall(snirm_a20r_setup_devinit);