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-rw-r--r--arch/arm/mach-rpc/Makefile11
-rw-r--r--arch/arm/mach-rpc/Makefile.boot4
-rw-r--r--arch/arm/mach-rpc/dma.c338
-rw-r--r--arch/arm/mach-rpc/irq.c162
-rw-r--r--arch/arm/mach-rpc/riscpc.c179
5 files changed, 694 insertions, 0 deletions
diff --git a/arch/arm/mach-rpc/Makefile b/arch/arm/mach-rpc/Makefile
new file mode 100644
index 00000000000..aa77bc9efbb
--- /dev/null
+++ b/arch/arm/mach-rpc/Makefile
@@ -0,0 +1,11 @@
+#
+# Makefile for the linux kernel.
+#
+
+# Object file lists.
+
+obj-y := dma.o irq.o riscpc.o
+obj-m :=
+obj-n :=
+obj- :=
+
diff --git a/arch/arm/mach-rpc/Makefile.boot b/arch/arm/mach-rpc/Makefile.boot
new file mode 100644
index 00000000000..9c9e7685ec7
--- /dev/null
+++ b/arch/arm/mach-rpc/Makefile.boot
@@ -0,0 +1,4 @@
+ zreladdr-y := 0x10008000
+params_phys-y := 0x10000100
+initrd_phys-y := 0x18000000
+
diff --git a/arch/arm/mach-rpc/dma.c b/arch/arm/mach-rpc/dma.c
new file mode 100644
index 00000000000..bc0747439fb
--- /dev/null
+++ b/arch/arm/mach-rpc/dma.c
@@ -0,0 +1,338 @@
+/*
+ * linux/arch/arm/mach-rpc/dma.c
+ *
+ * Copyright (C) 1998 Russell King
+ *
+ * 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.
+ *
+ * DMA functions specific to RiscPC architecture
+ */
+#include <linux/slab.h>
+#include <linux/mman.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/pci.h>
+
+#include <asm/page.h>
+#include <asm/dma.h>
+#include <asm/fiq.h>
+#include <asm/io.h>
+#include <asm/irq.h>
+#include <asm/hardware.h>
+#include <asm/uaccess.h>
+
+#include <asm/mach/dma.h>
+#include <asm/hardware/iomd.h>
+
+#if 0
+typedef enum {
+ dma_size_8 = 1,
+ dma_size_16 = 2,
+ dma_size_32 = 4,
+ dma_size_128 = 16
+} dma_size_t;
+#endif
+
+#define TRANSFER_SIZE 2
+
+#define CURA (0)
+#define ENDA (IOMD_IO0ENDA - IOMD_IO0CURA)
+#define CURB (IOMD_IO0CURB - IOMD_IO0CURA)
+#define ENDB (IOMD_IO0ENDB - IOMD_IO0CURA)
+#define CR (IOMD_IO0CR - IOMD_IO0CURA)
+#define ST (IOMD_IO0ST - IOMD_IO0CURA)
+
+static void iomd_get_next_sg(struct scatterlist *sg, dma_t *dma)
+{
+ unsigned long end, offset, flags = 0;
+
+ if (dma->sg) {
+ sg->dma_address = dma->sg->dma_address;
+ offset = sg->dma_address & ~PAGE_MASK;
+
+ end = offset + dma->sg->length;
+
+ if (end > PAGE_SIZE)
+ end = PAGE_SIZE;
+
+ if (offset + TRANSFER_SIZE >= end)
+ flags |= DMA_END_L;
+
+ sg->length = end - TRANSFER_SIZE;
+
+ dma->sg->length -= end - offset;
+ dma->sg->dma_address += end - offset;
+
+ if (dma->sg->length == 0) {
+ if (dma->sgcount > 1) {
+ dma->sg++;
+ dma->sgcount--;
+ } else {
+ dma->sg = NULL;
+ flags |= DMA_END_S;
+ }
+ }
+ } else {
+ flags = DMA_END_S | DMA_END_L;
+ sg->dma_address = 0;
+ sg->length = 0;
+ }
+
+ sg->length |= flags;
+}
+
+static irqreturn_t iomd_dma_handle(int irq, void *dev_id, struct pt_regs *regs)
+{
+ dma_t *dma = (dma_t *)dev_id;
+ unsigned long base = dma->dma_base;
+
+ do {
+ unsigned int status;
+
+ status = iomd_readb(base + ST);
+ if (!(status & DMA_ST_INT))
+ return IRQ_HANDLED;
+
+ if ((dma->state ^ status) & DMA_ST_AB)
+ iomd_get_next_sg(&dma->cur_sg, dma);
+
+ switch (status & (DMA_ST_OFL | DMA_ST_AB)) {
+ case DMA_ST_OFL: /* OIA */
+ case DMA_ST_AB: /* .IB */
+ iomd_writel(dma->cur_sg.dma_address, base + CURA);
+ iomd_writel(dma->cur_sg.length, base + ENDA);
+ dma->state = DMA_ST_AB;
+ break;
+
+ case DMA_ST_OFL | DMA_ST_AB: /* OIB */
+ case 0: /* .IA */
+ iomd_writel(dma->cur_sg.dma_address, base + CURB);
+ iomd_writel(dma->cur_sg.length, base + ENDB);
+ dma->state = 0;
+ break;
+ }
+
+ if (status & DMA_ST_OFL &&
+ dma->cur_sg.length == (DMA_END_S|DMA_END_L))
+ break;
+ } while (1);
+
+ dma->state = ~DMA_ST_AB;
+ disable_irq(irq);
+
+ return IRQ_HANDLED;
+}
+
+static int iomd_request_dma(dmach_t channel, dma_t *dma)
+{
+ return request_irq(dma->dma_irq, iomd_dma_handle,
+ SA_INTERRUPT, dma->device_id, dma);
+}
+
+static void iomd_free_dma(dmach_t channel, dma_t *dma)
+{
+ free_irq(dma->dma_irq, dma);
+}
+
+static void iomd_enable_dma(dmach_t channel, dma_t *dma)
+{
+ unsigned long dma_base = dma->dma_base;
+ unsigned int ctrl = TRANSFER_SIZE | DMA_CR_E;
+
+ if (dma->invalid) {
+ dma->invalid = 0;
+
+ /*
+ * Cope with ISA-style drivers which expect cache
+ * coherence.
+ */
+ if (!dma->using_sg) {
+ dma->buf.dma_address = pci_map_single(NULL,
+ dma->buf.__address, dma->buf.length,
+ dma->dma_mode == DMA_MODE_READ ?
+ PCI_DMA_FROMDEVICE : PCI_DMA_TODEVICE);
+ }
+
+ iomd_writeb(DMA_CR_C, dma_base + CR);
+ dma->state = DMA_ST_AB;
+ }
+
+ if (dma->dma_mode == DMA_MODE_READ)
+ ctrl |= DMA_CR_D;
+
+ iomd_writeb(ctrl, dma_base + CR);
+ enable_irq(dma->dma_irq);
+}
+
+static void iomd_disable_dma(dmach_t channel, dma_t *dma)
+{
+ unsigned long dma_base = dma->dma_base;
+ unsigned long flags;
+
+ local_irq_save(flags);
+ if (dma->state != ~DMA_ST_AB)
+ disable_irq(dma->dma_irq);
+ iomd_writeb(0, dma_base + CR);
+ local_irq_restore(flags);
+}
+
+static int iomd_set_dma_speed(dmach_t channel, dma_t *dma, int cycle)
+{
+ int tcr, speed;
+
+ if (cycle < 188)
+ speed = 3;
+ else if (cycle <= 250)
+ speed = 2;
+ else if (cycle < 438)
+ speed = 1;
+ else
+ speed = 0;
+
+ tcr = iomd_readb(IOMD_DMATCR);
+ speed &= 3;
+
+ switch (channel) {
+ case DMA_0:
+ tcr = (tcr & ~0x03) | speed;
+ break;
+
+ case DMA_1:
+ tcr = (tcr & ~0x0c) | (speed << 2);
+ break;
+
+ case DMA_2:
+ tcr = (tcr & ~0x30) | (speed << 4);
+ break;
+
+ case DMA_3:
+ tcr = (tcr & ~0xc0) | (speed << 6);
+ break;
+
+ default:
+ break;
+ }
+
+ iomd_writeb(tcr, IOMD_DMATCR);
+
+ return speed;
+}
+
+static struct dma_ops iomd_dma_ops = {
+ .type = "IOMD",
+ .request = iomd_request_dma,
+ .free = iomd_free_dma,
+ .enable = iomd_enable_dma,
+ .disable = iomd_disable_dma,
+ .setspeed = iomd_set_dma_speed,
+};
+
+static struct fiq_handler fh = {
+ .name = "floppydma"
+};
+
+static void floppy_enable_dma(dmach_t channel, dma_t *dma)
+{
+ void *fiqhandler_start;
+ unsigned int fiqhandler_length;
+ struct pt_regs regs;
+
+ if (dma->using_sg)
+ BUG();
+
+ if (dma->dma_mode == DMA_MODE_READ) {
+ extern unsigned char floppy_fiqin_start, floppy_fiqin_end;
+ fiqhandler_start = &floppy_fiqin_start;
+ fiqhandler_length = &floppy_fiqin_end - &floppy_fiqin_start;
+ } else {
+ extern unsigned char floppy_fiqout_start, floppy_fiqout_end;
+ fiqhandler_start = &floppy_fiqout_start;
+ fiqhandler_length = &floppy_fiqout_end - &floppy_fiqout_start;
+ }
+
+ regs.ARM_r9 = dma->buf.length;
+ regs.ARM_r10 = (unsigned long)dma->buf.__address;
+ regs.ARM_fp = (unsigned long)FLOPPYDMA_BASE;
+
+ if (claim_fiq(&fh)) {
+ printk("floppydma: couldn't claim FIQ.\n");
+ return;
+ }
+
+ set_fiq_handler(fiqhandler_start, fiqhandler_length);
+ set_fiq_regs(&regs);
+ enable_fiq(dma->dma_irq);
+}
+
+static void floppy_disable_dma(dmach_t channel, dma_t *dma)
+{
+ disable_fiq(dma->dma_irq);
+ release_fiq(&fh);
+}
+
+static int floppy_get_residue(dmach_t channel, dma_t *dma)
+{
+ struct pt_regs regs;
+ get_fiq_regs(&regs);
+ return regs.ARM_r9;
+}
+
+static struct dma_ops floppy_dma_ops = {
+ .type = "FIQDMA",
+ .enable = floppy_enable_dma,
+ .disable = floppy_disable_dma,
+ .residue = floppy_get_residue,
+};
+
+/*
+ * This is virtual DMA - we don't need anything here.
+ */
+static void sound_enable_disable_dma(dmach_t channel, dma_t *dma)
+{
+}
+
+static struct dma_ops sound_dma_ops = {
+ .type = "VIRTUAL",
+ .enable = sound_enable_disable_dma,
+ .disable = sound_enable_disable_dma,
+};
+
+void __init arch_dma_init(dma_t *dma)
+{
+ iomd_writeb(0, IOMD_IO0CR);
+ iomd_writeb(0, IOMD_IO1CR);
+ iomd_writeb(0, IOMD_IO2CR);
+ iomd_writeb(0, IOMD_IO3CR);
+
+ iomd_writeb(0xa0, IOMD_DMATCR);
+
+ dma[DMA_0].dma_base = IOMD_IO0CURA;
+ dma[DMA_0].dma_irq = IRQ_DMA0;
+ dma[DMA_0].d_ops = &iomd_dma_ops;
+ dma[DMA_1].dma_base = IOMD_IO1CURA;
+ dma[DMA_1].dma_irq = IRQ_DMA1;
+ dma[DMA_1].d_ops = &iomd_dma_ops;
+ dma[DMA_2].dma_base = IOMD_IO2CURA;
+ dma[DMA_2].dma_irq = IRQ_DMA2;
+ dma[DMA_2].d_ops = &iomd_dma_ops;
+ dma[DMA_3].dma_base = IOMD_IO3CURA;
+ dma[DMA_3].dma_irq = IRQ_DMA3;
+ dma[DMA_3].d_ops = &iomd_dma_ops;
+ dma[DMA_S0].dma_base = IOMD_SD0CURA;
+ dma[DMA_S0].dma_irq = IRQ_DMAS0;
+ dma[DMA_S0].d_ops = &iomd_dma_ops;
+ dma[DMA_S1].dma_base = IOMD_SD1CURA;
+ dma[DMA_S1].dma_irq = IRQ_DMAS1;
+ dma[DMA_S1].d_ops = &iomd_dma_ops;
+ dma[DMA_VIRTUAL_FLOPPY].dma_irq = FIQ_FLOPPYDATA;
+ dma[DMA_VIRTUAL_FLOPPY].d_ops = &floppy_dma_ops;
+ dma[DMA_VIRTUAL_SOUND].d_ops = &sound_dma_ops;
+
+ /*
+ * Setup DMA channels 2,3 to be for podules
+ * and channels 0,1 for internal devices
+ */
+ iomd_writeb(DMA_EXT_IO3|DMA_EXT_IO2, IOMD_DMAEXT);
+}
diff --git a/arch/arm/mach-rpc/irq.c b/arch/arm/mach-rpc/irq.c
new file mode 100644
index 00000000000..56b2716f8cf
--- /dev/null
+++ b/arch/arm/mach-rpc/irq.c
@@ -0,0 +1,162 @@
+#include <linux/init.h>
+#include <linux/list.h>
+
+#include <asm/mach/irq.h>
+#include <asm/hardware/iomd.h>
+#include <asm/irq.h>
+#include <asm/io.h>
+
+static void iomd_ack_irq_a(unsigned int irq)
+{
+ unsigned int val, mask;
+
+ mask = 1 << irq;
+ val = iomd_readb(IOMD_IRQMASKA);
+ iomd_writeb(val & ~mask, IOMD_IRQMASKA);
+ iomd_writeb(mask, IOMD_IRQCLRA);
+}
+
+static void iomd_mask_irq_a(unsigned int irq)
+{
+ unsigned int val, mask;
+
+ mask = 1 << irq;
+ val = iomd_readb(IOMD_IRQMASKA);
+ iomd_writeb(val & ~mask, IOMD_IRQMASKA);
+}
+
+static void iomd_unmask_irq_a(unsigned int irq)
+{
+ unsigned int val, mask;
+
+ mask = 1 << irq;
+ val = iomd_readb(IOMD_IRQMASKA);
+ iomd_writeb(val | mask, IOMD_IRQMASKA);
+}
+
+static struct irqchip iomd_a_chip = {
+ .ack = iomd_ack_irq_a,
+ .mask = iomd_mask_irq_a,
+ .unmask = iomd_unmask_irq_a,
+};
+
+static void iomd_mask_irq_b(unsigned int irq)
+{
+ unsigned int val, mask;
+
+ mask = 1 << (irq & 7);
+ val = iomd_readb(IOMD_IRQMASKB);
+ iomd_writeb(val & ~mask, IOMD_IRQMASKB);
+}
+
+static void iomd_unmask_irq_b(unsigned int irq)
+{
+ unsigned int val, mask;
+
+ mask = 1 << (irq & 7);
+ val = iomd_readb(IOMD_IRQMASKB);
+ iomd_writeb(val | mask, IOMD_IRQMASKB);
+}
+
+static struct irqchip iomd_b_chip = {
+ .ack = iomd_mask_irq_b,
+ .mask = iomd_mask_irq_b,
+ .unmask = iomd_unmask_irq_b,
+};
+
+static void iomd_mask_irq_dma(unsigned int irq)
+{
+ unsigned int val, mask;
+
+ mask = 1 << (irq & 7);
+ val = iomd_readb(IOMD_DMAMASK);
+ iomd_writeb(val & ~mask, IOMD_DMAMASK);
+}
+
+static void iomd_unmask_irq_dma(unsigned int irq)
+{
+ unsigned int val, mask;
+
+ mask = 1 << (irq & 7);
+ val = iomd_readb(IOMD_DMAMASK);
+ iomd_writeb(val | mask, IOMD_DMAMASK);
+}
+
+static struct irqchip iomd_dma_chip = {
+ .ack = iomd_mask_irq_dma,
+ .mask = iomd_mask_irq_dma,
+ .unmask = iomd_unmask_irq_dma,
+};
+
+static void iomd_mask_irq_fiq(unsigned int irq)
+{
+ unsigned int val, mask;
+
+ mask = 1 << (irq & 7);
+ val = iomd_readb(IOMD_FIQMASK);
+ iomd_writeb(val & ~mask, IOMD_FIQMASK);
+}
+
+static void iomd_unmask_irq_fiq(unsigned int irq)
+{
+ unsigned int val, mask;
+
+ mask = 1 << (irq & 7);
+ val = iomd_readb(IOMD_FIQMASK);
+ iomd_writeb(val | mask, IOMD_FIQMASK);
+}
+
+static struct irqchip iomd_fiq_chip = {
+ .ack = iomd_mask_irq_fiq,
+ .mask = iomd_mask_irq_fiq,
+ .unmask = iomd_unmask_irq_fiq,
+};
+
+void __init rpc_init_irq(void)
+{
+ unsigned int irq, flags;
+
+ iomd_writeb(0, IOMD_IRQMASKA);
+ iomd_writeb(0, IOMD_IRQMASKB);
+ iomd_writeb(0, IOMD_FIQMASK);
+ iomd_writeb(0, IOMD_DMAMASK);
+
+ for (irq = 0; irq < NR_IRQS; irq++) {
+ flags = IRQF_VALID;
+
+ if (irq <= 6 || (irq >= 9 && irq <= 15))
+ flags |= IRQF_PROBE;
+
+ if (irq == 21 || (irq >= 16 && irq <= 19) ||
+ irq == IRQ_KEYBOARDTX)
+ flags |= IRQF_NOAUTOEN;
+
+ switch (irq) {
+ case 0 ... 7:
+ set_irq_chip(irq, &iomd_a_chip);
+ set_irq_handler(irq, do_level_IRQ);
+ set_irq_flags(irq, flags);
+ break;
+
+ case 8 ... 15:
+ set_irq_chip(irq, &iomd_b_chip);
+ set_irq_handler(irq, do_level_IRQ);
+ set_irq_flags(irq, flags);
+ break;
+
+ case 16 ... 21:
+ set_irq_chip(irq, &iomd_dma_chip);
+ set_irq_handler(irq, do_level_IRQ);
+ set_irq_flags(irq, flags);
+ break;
+
+ case 64 ... 71:
+ set_irq_chip(irq, &iomd_fiq_chip);
+ set_irq_flags(irq, IRQF_VALID);
+ break;
+ }
+ }
+
+ init_FIQ();
+}
+
diff --git a/arch/arm/mach-rpc/riscpc.c b/arch/arm/mach-rpc/riscpc.c
new file mode 100644
index 00000000000..815c53225cd
--- /dev/null
+++ b/arch/arm/mach-rpc/riscpc.c
@@ -0,0 +1,179 @@
+/*
+ * linux/arch/arm/mach-rpc/riscpc.c
+ *
+ * Copyright (C) 1998-2001 Russell King
+ *
+ * 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.
+ *
+ * Architecture specific fixups.
+ */
+#include <linux/kernel.h>
+#include <linux/tty.h>
+#include <linux/delay.h>
+#include <linux/pm.h>
+#include <linux/init.h>
+#include <linux/sched.h>
+#include <linux/device.h>
+#include <linux/serial_8250.h>
+
+#include <asm/elf.h>
+#include <asm/io.h>
+#include <asm/mach-types.h>
+#include <asm/hardware.h>
+#include <asm/page.h>
+#include <asm/domain.h>
+#include <asm/setup.h>
+
+#include <asm/mach/map.h>
+#include <asm/mach/arch.h>
+#include <asm/mach/time.h>
+
+extern void rpc_init_irq(void);
+
+extern unsigned int vram_size;
+
+#if 0
+
+unsigned int memc_ctrl_reg;
+unsigned int number_mfm_drives;
+
+static int __init parse_tag_acorn(const struct tag *tag)
+{
+ memc_ctrl_reg = tag->u.acorn.memc_control_reg;
+ number_mfm_drives = tag->u.acorn.adfsdrives;
+
+ switch (tag->u.acorn.vram_pages) {
+ case 512:
+ vram_size += PAGE_SIZE * 256;
+ case 256:
+ vram_size += PAGE_SIZE * 256;
+ default:
+ break;
+ }
+#if 0
+ if (vram_size) {
+ desc->video_start = 0x02000000;
+ desc->video_end = 0x02000000 + vram_size;
+ }
+#endif
+ return 0;
+}
+
+__tagtable(ATAG_ACORN, parse_tag_acorn);
+
+#endif
+
+static struct map_desc rpc_io_desc[] __initdata = {
+ { SCREEN_BASE, SCREEN_START, 2*1048576, MT_DEVICE }, /* VRAM */
+ { (u32)IO_BASE, IO_START, IO_SIZE , MT_DEVICE }, /* IO space */
+ { EASI_BASE, EASI_START, EASI_SIZE, MT_DEVICE } /* EASI space */
+};
+
+static void __init rpc_map_io(void)
+{
+ iotable_init(rpc_io_desc, ARRAY_SIZE(rpc_io_desc));
+
+ /*
+ * Turn off floppy.
+ */
+ outb(0xc, 0x3f2);
+
+ /*
+ * RiscPC can't handle half-word loads and stores
+ */
+ elf_hwcap &= ~HWCAP_HALF;
+}
+
+static struct resource acornfb_resources[] = {
+ { /* VIDC */
+ .start = 0x03400000,
+ .end = 0x035fffff,
+ .flags = IORESOURCE_MEM,
+ }, {
+ .start = IRQ_VSYNCPULSE,
+ .end = IRQ_VSYNCPULSE,
+ .flags = IORESOURCE_IRQ,
+ },
+};
+
+static struct platform_device acornfb_device = {
+ .name = "acornfb",
+ .id = -1,
+ .dev = {
+ .coherent_dma_mask = 0xffffffff,
+ },
+ .num_resources = ARRAY_SIZE(acornfb_resources),
+ .resource = acornfb_resources,
+};
+
+static struct resource iomd_resources[] = {
+ {
+ .start = 0x03200000,
+ .end = 0x0320ffff,
+ .flags = IORESOURCE_MEM,
+ },
+};
+
+static struct platform_device iomd_device = {
+ .name = "iomd",
+ .id = -1,
+ .num_resources = ARRAY_SIZE(iomd_resources),
+ .resource = iomd_resources,
+};
+
+static struct platform_device kbd_device = {
+ .name = "kart",
+ .id = -1,
+ .dev = {
+ .parent = &iomd_device.dev,
+ },
+};
+
+static struct plat_serial8250_port serial_platform_data[] = {
+ {
+ .mapbase = 0x03010fe0,
+ .irq = 10,
+ .uartclk = 1843200,
+ .regshift = 2,
+ .iotype = UPIO_MEM,
+ .flags = UPF_BOOT_AUTOCONF | UPF_IOREMAP | UPF_SKIP_TEST,
+ },
+ { },
+};
+
+static struct platform_device serial_device = {
+ .name = "serial8250",
+ .id = 0,
+ .dev = {
+ .platform_data = serial_platform_data,
+ },
+};
+
+static struct platform_device *devs[] __initdata = {
+ &iomd_device,
+ &kbd_device,
+ &serial_device,
+ &acornfb_device,
+};
+
+static int __init rpc_init(void)
+{
+ return platform_add_devices(devs, ARRAY_SIZE(devs));
+}
+
+arch_initcall(rpc_init);
+
+extern struct sys_timer ioc_timer;
+
+MACHINE_START(RISCPC, "Acorn-RiscPC")
+ MAINTAINER("Russell King")
+ BOOT_MEM(0x10000000, 0x03000000, 0xe0000000)
+ BOOT_PARAMS(0x10000100)
+ DISABLE_PARPORT(0)
+ DISABLE_PARPORT(1)
+ MAPIO(rpc_map_io)
+ INITIRQ(rpc_init_irq)
+ .timer = &ioc_timer,
+MACHINE_END
generated by cgit v1.2.3 (git 2.25.1) at 2024-04-20 02:27:42 +0000