blackfin architecture

This adds support for the Analog Devices Blackfin processor architecture, and
currently supports the BF533, BF532, BF531, BF537, BF536, BF534, and BF561
(Dual Core) devices, with a variety of development platforms including those
avaliable from Analog Devices (BF533-EZKit, BF533-STAMP, BF537-STAMP,
BF561-EZKIT), and Bluetechnix!  Tinyboards.

The Blackfin architecture was jointly developed by Intel and Analog Devices
Inc.  (ADI) as the Micro Signal Architecture (MSA) core and introduced it in
December of 2000.  Since then ADI has put this core into its Blackfin
processor family of devices.  The Blackfin core has the advantages of a clean,
orthogonal,RISC-like microprocessor instruction set.  It combines a dual-MAC
(Multiply/Accumulate), state-of-the-art signal processing engine and
single-instruction, multiple-data (SIMD) multimedia capabilities into a single
instruction-set architecture.

The Blackfin architecture, including the instruction set, is described by the
ADSP-BF53x/BF56x Blackfin Processor Programming Reference
http://blackfin.uclinux.org/gf/download/frsrelease/29/2549/Blackfin_PRM.pdf

The Blackfin processor is already supported by major releases of gcc, and
there are binary and source rpms/tarballs for many architectures at:
http://blackfin.uclinux.org/gf/project/toolchain/frs There is complete
documentation, including "getting started" guides available at:
http://docs.blackfin.uclinux.org/ which provides links to the sources and
patches you will need in order to set up a cross-compiling environment for
bfin-linux-uclibc

This patch, as well as the other patches (toolchain, distribution,
uClibc) are actively supported by Analog Devices Inc, at:
http://blackfin.uclinux.org/

We have tested this on LTP, and our test plan (including pass/fails) can
be found at:
http://docs.blackfin.uclinux.org/doku.php?id=testing_the_linux_kernel

[m.kozlowski@tuxland.pl: balance parenthesis in blackfin header files]
Signed-off-by: Bryan Wu <bryan.wu@analog.com>
Signed-off-by: Mariusz Kozlowski <m.kozlowski@tuxland.pl>
Signed-off-by: Aubrey Li <aubrey.li@analog.com>
Signed-off-by: Jie Zhang <jie.zhang@analog.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 577 insertions, 0 deletions

diff --git a/arch/blackfin/mach-common/ints-priority-sc.c b/arch/blackfin/mach-common/ints-priority-sc.c
new file mode 100644
index 0000000..34b6228
--- /dev/null
+++ b/arch/blackfin/mach-common/ints-priority-sc.c
@@ -0,0 +1,577 @@
+/*
+ * File:         arch/blackfin/mach-common/ints-priority-sc.c
+ * Based on:
+ * Author:
+ *
+ * Created:      ?
+ * Description:  Set up the interupt priorities
+ *
+ * Modified:
+ *               1996 Roman Zippel
+ *               1999 D. Jeff Dionne <jeff@uclinux.org>
+ *               2000-2001 Lineo, Inc. D. Jefff Dionne <jeff@lineo.ca>
+ *               2002 Arcturus Networks Inc. MaTed <mated@sympatico.ca>
+ *               2003 Metrowerks/Motorola
+ *               2003 Bas Vermeulen <bas@buyways.nl>
+ *               Copyright 2004-2006 Analog Devices Inc.
+ *
+ * Bugs:         Enter bugs at http://blackfin.uclinux.org/
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, see the file COPYING, or write
+ * to the Free Software Foundation, Inc.,
+ * 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+
+#include <linux/module.h>
+#include <linux/kernel_stat.h>
+#include <linux/seq_file.h>
+#include <linux/irq.h>
+#ifdef CONFIG_KGDB
+#include <linux/kgdb.h>
+#endif
+#include <asm/traps.h>
+#include <asm/blackfin.h>
+#include <asm/gpio.h>
+#include <asm/irq_handler.h>
+
+#ifdef BF537_FAMILY
+# define BF537_GENERIC_ERROR_INT_DEMUX
+#else
+# undef BF537_GENERIC_ERROR_INT_DEMUX
+#endif
+
+/*
+ * NOTES:
+ * - we have separated the physical Hardware interrupt from the
+ * levels that the LINUX kernel sees (see the description in irq.h)
+ * -
+ */
+
+unsigned long irq_flags = 0;
+
+/* The number of spurious interrupts */
+atomic_t num_spurious;
+
+struct ivgx {
+	/* irq number for request_irq, available in mach-bf533/irq.h */
+	int irqno;
+	/* corresponding bit in the SIC_ISR register */
+	int isrflag;
+} ivg_table[NR_PERI_INTS];
+
+struct ivg_slice {
+	/* position of first irq in ivg_table for given ivg */
+	struct ivgx *ifirst;
+	struct ivgx *istop;
+} ivg7_13[IVG13 - IVG7 + 1];
+
+static void search_IAR(void);
+
+/*
+ * Search SIC_IAR and fill tables with the irqvalues
+ * and their positions in the SIC_ISR register.
+ */
+static void __init search_IAR(void)
+{
+	unsigned ivg, irq_pos = 0;
+	for (ivg = 0; ivg <= IVG13 - IVG7; ivg++) {
+		int irqn;
+
+		ivg7_13[ivg].istop = ivg7_13[ivg].ifirst =
+		    &ivg_table[irq_pos];
+
+		for (irqn = 0; irqn < NR_PERI_INTS; irqn++) {
+			int iar_shift = (irqn & 7) * 4;
+			if (ivg ==
+			    (0xf &
+			     bfin_read32((unsigned long *) SIC_IAR0 +
+					 (irqn >> 3)) >> iar_shift)) {
+				ivg_table[irq_pos].irqno = IVG7 + irqn;
+				ivg_table[irq_pos].isrflag = 1 << irqn;
+				ivg7_13[ivg].istop++;
+				irq_pos++;
+			}
+		}
+	}
+}
+
+/*
+ * This is for BF533 internal IRQs
+ */
+
+static void ack_noop(unsigned int irq)
+{
+	/* Dummy function.  */
+}
+
+static void bfin_core_mask_irq(unsigned int irq)
+{
+	irq_flags &= ~(1 << irq);
+	if (!irqs_disabled())
+		local_irq_enable();
+}
+
+static void bfin_core_unmask_irq(unsigned int irq)
+{
+	irq_flags |= 1 << irq;
+	/*
+	 * If interrupts are enabled, IMASK must contain the same value
+	 * as irq_flags.  Make sure that invariant holds.  If interrupts
+	 * are currently disabled we need not do anything; one of the
+	 * callers will take care of setting IMASK to the proper value
+	 * when reenabling interrupts.
+	 * local_irq_enable just does "STI irq_flags", so it's exactly
+	 * what we need.
+	 */
+	if (!irqs_disabled())
+		local_irq_enable();
+	return;
+}
+
+static void bfin_internal_mask_irq(unsigned int irq)
+{
+	bfin_write_SIC_IMASK(bfin_read_SIC_IMASK() &
+			     ~(1 << (irq - (IRQ_CORETMR + 1))));
+	SSYNC();
+}
+
+static void bfin_internal_unmask_irq(unsigned int irq)
+{
+	bfin_write_SIC_IMASK(bfin_read_SIC_IMASK() |
+			     (1 << (irq - (IRQ_CORETMR + 1))));
+	SSYNC();
+}
+
+static struct irq_chip bfin_core_irqchip = {
+	.ack = ack_noop,
+	.mask = bfin_core_mask_irq,
+	.unmask = bfin_core_unmask_irq,
+};
+
+static struct irq_chip bfin_internal_irqchip = {
+	.ack = ack_noop,
+	.mask = bfin_internal_mask_irq,
+	.unmask = bfin_internal_unmask_irq,
+};
+
+#ifdef BF537_GENERIC_ERROR_INT_DEMUX
+static int error_int_mask;
+
+static void bfin_generic_error_ack_irq(unsigned int irq)
+{
+
+}
+
+static void bfin_generic_error_mask_irq(unsigned int irq)
+{
+	error_int_mask &= ~(1L << (irq - IRQ_PPI_ERROR));
+
+	if (!error_int_mask) {
+		local_irq_disable();
+		bfin_write_SIC_IMASK(bfin_read_SIC_IMASK() &
+				     ~(1 <<
+				       (IRQ_GENERIC_ERROR -
+					(IRQ_CORETMR + 1))));
+		SSYNC();
+		local_irq_enable();
+	}
+}
+
+static void bfin_generic_error_unmask_irq(unsigned int irq)
+{
+	local_irq_disable();
+	bfin_write_SIC_IMASK(bfin_read_SIC_IMASK() | 1 <<
+			     (IRQ_GENERIC_ERROR - (IRQ_CORETMR + 1)));
+	SSYNC();
+	local_irq_enable();
+
+	error_int_mask |= 1L << (irq - IRQ_PPI_ERROR);
+}
+
+static struct irq_chip bfin_generic_error_irqchip = {
+	.ack = bfin_generic_error_ack_irq,
+	.mask = bfin_generic_error_mask_irq,
+	.unmask = bfin_generic_error_unmask_irq,
+};
+
+static void bfin_demux_error_irq(unsigned int int_err_irq,
+				  struct irq_desc *intb_desc)
+{
+	int irq = 0;
+
+	SSYNC();
+
+#if (defined(CONFIG_BF537) || defined(CONFIG_BF536))
+	if (bfin_read_EMAC_SYSTAT() & EMAC_ERR_MASK)
+		irq = IRQ_MAC_ERROR;
+	else
+#endif
+	if (bfin_read_SPORT0_STAT() & SPORT_ERR_MASK)
+		irq = IRQ_SPORT0_ERROR;
+	else if (bfin_read_SPORT1_STAT() & SPORT_ERR_MASK)
+		irq = IRQ_SPORT1_ERROR;
+	else if (bfin_read_PPI_STATUS() & PPI_ERR_MASK)
+		irq = IRQ_PPI_ERROR;
+	else if (bfin_read_CAN_GIF() & CAN_ERR_MASK)
+		irq = IRQ_CAN_ERROR;
+	else if (bfin_read_SPI_STAT() & SPI_ERR_MASK)
+		irq = IRQ_SPI_ERROR;
+	else if ((bfin_read_UART0_IIR() & UART_ERR_MASK_STAT1) &&
+		 (bfin_read_UART0_IIR() & UART_ERR_MASK_STAT0))
+		irq = IRQ_UART0_ERROR;
+	else if ((bfin_read_UART1_IIR() & UART_ERR_MASK_STAT1) &&
+		 (bfin_read_UART1_IIR() & UART_ERR_MASK_STAT0))
+		irq = IRQ_UART1_ERROR;
+
+	if (irq) {
+		if (error_int_mask & (1L << (irq - IRQ_PPI_ERROR))) {
+			struct irq_desc *desc = irq_desc + irq;
+			desc->handle_irq(irq, desc);
+		} else {
+
+			switch (irq) {
+			case IRQ_PPI_ERROR:
+				bfin_write_PPI_STATUS(PPI_ERR_MASK);
+				break;
+#if (defined(CONFIG_BF537) || defined(CONFIG_BF536))
+			case IRQ_MAC_ERROR:
+				bfin_write_EMAC_SYSTAT(EMAC_ERR_MASK);
+				break;
+#endif
+			case IRQ_SPORT0_ERROR:
+				bfin_write_SPORT0_STAT(SPORT_ERR_MASK);
+				break;
+
+			case IRQ_SPORT1_ERROR:
+				bfin_write_SPORT1_STAT(SPORT_ERR_MASK);
+				break;
+
+			case IRQ_CAN_ERROR:
+				bfin_write_CAN_GIS(CAN_ERR_MASK);
+				break;
+
+			case IRQ_SPI_ERROR:
+				bfin_write_SPI_STAT(SPI_ERR_MASK);
+				break;
+
+			default:
+				break;
+			}
+
+			pr_debug("IRQ %d:"
+				" MASKED PERIPHERAL ERROR INTERRUPT ASSERTED\n",
+				irq);
+		}
+	} else
+		printk(KERN_ERR
+		       "%s : %s : LINE %d :\nIRQ ?: PERIPHERAL ERROR"
+		       " INTERRUPT ASSERTED BUT NO SOURCE FOUND\n",
+		       __FUNCTION__, __FILE__, __LINE__);
+
+
+}
+#endif				/* BF537_GENERIC_ERROR_INT_DEMUX */
+
+#ifdef CONFIG_IRQCHIP_DEMUX_GPIO
+
+static unsigned short gpio_enabled[gpio_bank(MAX_BLACKFIN_GPIOS)];
+static unsigned short gpio_edge_triggered[gpio_bank(MAX_BLACKFIN_GPIOS)];
+
+static void bfin_gpio_ack_irq(unsigned int irq)
+{
+	u16 gpionr = irq - IRQ_PF0;
+
+	if (gpio_edge_triggered[gpio_bank(gpionr)] & gpio_bit(gpionr)) {
+		set_gpio_data(gpionr, 0);
+		SSYNC();
+	}
+}
+
+static void bfin_gpio_mask_ack_irq(unsigned int irq)
+{
+	u16 gpionr = irq - IRQ_PF0;
+
+	if (gpio_edge_triggered[gpio_bank(gpionr)] & gpio_bit(gpionr)) {
+		set_gpio_data(gpionr, 0);
+		SSYNC();
+	}
+
+	set_gpio_maska(gpionr, 0);
+	SSYNC();
+}
+
+static void bfin_gpio_mask_irq(unsigned int irq)
+{
+	set_gpio_maska(irq - IRQ_PF0, 0);
+	SSYNC();
+}
+
+static void bfin_gpio_unmask_irq(unsigned int irq)
+{
+	set_gpio_maska(irq - IRQ_PF0, 1);
+	SSYNC();
+}
+
+static unsigned int bfin_gpio_irq_startup(unsigned int irq)
+{
+	unsigned int ret;
+	u16 gpionr = irq - IRQ_PF0;
+
+	if (!(gpio_enabled[gpio_bank(gpionr)] & gpio_bit(gpionr))) {
+		ret = gpio_request(gpionr, NULL);
+		if (ret)
+			return ret;
+	}
+
+	gpio_enabled[gpio_bank(gpionr)] |= gpio_bit(gpionr);
+	bfin_gpio_unmask_irq(irq);
+
+	return ret;
+}
+
+static void bfin_gpio_irq_shutdown(unsigned int irq)
+{
+	bfin_gpio_mask_irq(irq);
+	gpio_free(irq - IRQ_PF0);
+	gpio_enabled[gpio_bank(irq - IRQ_PF0)] &= ~gpio_bit(irq - IRQ_PF0);
+}
+
+static int bfin_gpio_irq_type(unsigned int irq, unsigned int type)
+{
+
+	unsigned int ret;
+	u16 gpionr = irq - IRQ_PF0;
+
+	if (type == IRQ_TYPE_PROBE) {
+		/* only probe unenabled GPIO interrupt lines */
+		if (gpio_enabled[gpio_bank(gpionr)] & gpio_bit(gpionr))
+			return 0;
+		type = IRQ_TYPE_EDGE_RISING | IRQ_TYPE_EDGE_FALLING;
+	}
+
+	if (type & (IRQ_TYPE_EDGE_RISING | IRQ_TYPE_EDGE_FALLING |
+	            IRQ_TYPE_LEVEL_HIGH | IRQ_TYPE_LEVEL_LOW))
+	{
+		if (!(gpio_enabled[gpio_bank(gpionr)] & gpio_bit(gpionr))) {
+			ret = gpio_request(gpionr, NULL);
+			if (ret)
+				return ret;
+		}
+
+		gpio_enabled[gpio_bank(gpionr)] |= gpio_bit(gpionr);
+	} else {
+		gpio_enabled[gpio_bank(gpionr)] &= ~gpio_bit(gpionr);
+		return 0;
+	}
+
+	set_gpio_dir(gpionr, 0);
+	set_gpio_inen(gpionr, 1);
+
+	if (type & (IRQ_TYPE_EDGE_RISING | IRQ_TYPE_EDGE_FALLING)) {
+		gpio_edge_triggered[gpio_bank(gpionr)] |= gpio_bit(gpionr);
+		set_gpio_edge(gpionr, 1);
+	} else {
+		set_gpio_edge(gpionr, 0);
+		gpio_edge_triggered[gpio_bank(gpionr)] &= ~gpio_bit(gpionr);
+	}
+
+	if ((type & (IRQ_TYPE_EDGE_RISING | IRQ_TYPE_EDGE_FALLING))
+	    == (IRQ_TYPE_EDGE_RISING | IRQ_TYPE_EDGE_FALLING))
+		set_gpio_both(gpionr, 1);
+	else
+		set_gpio_both(gpionr, 0);
+
+	if ((type & (IRQ_TYPE_EDGE_FALLING | IRQ_TYPE_LEVEL_LOW)))
+		set_gpio_polar(gpionr, 1);	/* low or falling edge denoted by one */
+	else
+		set_gpio_polar(gpionr, 0);	/* high or rising edge denoted by zero */
+
+	SSYNC();
+
+	if (type & (IRQ_TYPE_EDGE_RISING | IRQ_TYPE_EDGE_FALLING))
+		set_irq_handler(irq, handle_edge_irq);
+	else
+		set_irq_handler(irq, handle_level_irq);
+
+	return 0;
+}
+
+
+static struct irq_chip bfin_gpio_irqchip = {
+	.ack = bfin_gpio_ack_irq,
+	.mask = bfin_gpio_mask_irq,
+	.mask_ack = bfin_gpio_mask_ack_irq,
+	.unmask = bfin_gpio_unmask_irq,
+	.set_type = bfin_gpio_irq_type,
+	.startup = bfin_gpio_irq_startup,
+	.shutdown = bfin_gpio_irq_shutdown
+};
+
+static void bfin_demux_gpio_irq(unsigned int intb_irq,
+				 struct irq_desc *intb_desc)
+{
+	u16 i;
+
+	for (i = 0; i < MAX_BLACKFIN_GPIOS; i+=16) {
+		int irq = IRQ_PF0 + i;
+		int flag_d = get_gpiop_data(i);
+		int mask =
+			flag_d & (gpio_enabled[gpio_bank(i)] &
+			      get_gpiop_maska(i));
+
+		while (mask) {
+			if (mask & 1) {
+				struct irq_desc *desc = irq_desc + irq;
+				desc->handle_irq(irq, desc);
+			}
+			irq++;
+			mask >>= 1;
+		}
+	}
+}
+
+#endif				/* CONFIG_IRQCHIP_DEMUX_GPIO */
+
+/*
+ * This function should be called during kernel startup to initialize
+ * the BFin IRQ handling routines.
+ */
+int __init init_arch_irq(void)
+{
+	int irq;
+	unsigned long ilat = 0;
+	/*  Disable all the peripheral intrs  - page 4-29 HW Ref manual */
+	bfin_write_SIC_IMASK(SIC_UNMASK_ALL);
+	SSYNC();
+
+	local_irq_disable();
+
+#ifndef CONFIG_KGDB
+	bfin_write_EVT0(evt_emulation);
+#endif
+	bfin_write_EVT2(evt_evt2);
+	bfin_write_EVT3(trap);
+	bfin_write_EVT5(evt_ivhw);
+	bfin_write_EVT6(evt_timer);
+	bfin_write_EVT7(evt_evt7);
+	bfin_write_EVT8(evt_evt8);
+	bfin_write_EVT9(evt_evt9);
+	bfin_write_EVT10(evt_evt10);
+	bfin_write_EVT11(evt_evt11);
+	bfin_write_EVT12(evt_evt12);
+	bfin_write_EVT13(evt_evt13);
+	bfin_write_EVT14(evt14_softirq);
+	bfin_write_EVT15(evt_system_call);
+	CSYNC();
+
+	for (irq = 0; irq < SYS_IRQS; irq++) {
+		if (irq <= IRQ_CORETMR)
+			set_irq_chip(irq, &bfin_core_irqchip);
+		else
+			set_irq_chip(irq, &bfin_internal_irqchip);
+#ifdef BF537_GENERIC_ERROR_INT_DEMUX
+		if (irq != IRQ_GENERIC_ERROR) {
+#endif
+
+#ifdef CONFIG_IRQCHIP_DEMUX_GPIO
+			if ((irq != IRQ_PROG_INTA) /*PORT F & G MASK_A Interrupt*/
+# if defined(BF537_FAMILY) && !(defined(CONFIG_BFIN_MAC) || defined(CONFIG_BFIN_MAC_MODULE))
+				&& (irq != IRQ_MAC_RX) /*PORT H MASK_A Interrupt*/
+# endif
+			    ) {
+#endif
+				set_irq_handler(irq, handle_simple_irq);
+#ifdef CONFIG_IRQCHIP_DEMUX_GPIO
+			} else {
+				set_irq_chained_handler(irq,
+							bfin_demux_gpio_irq);
+			}
+#endif
+
+#ifdef BF537_GENERIC_ERROR_INT_DEMUX
+		} else {
+			set_irq_handler(irq, bfin_demux_error_irq);
+		}
+#endif
+	}
+#ifdef BF537_GENERIC_ERROR_INT_DEMUX
+	for (irq = IRQ_PPI_ERROR; irq <= IRQ_UART1_ERROR; irq++) {
+		set_irq_chip(irq, &bfin_generic_error_irqchip);
+		set_irq_handler(irq, handle_level_irq);
+	}
+#endif
+
+#ifdef CONFIG_IRQCHIP_DEMUX_GPIO
+	for (irq = IRQ_PF0; irq < NR_IRQS; irq++) {
+		set_irq_chip(irq, &bfin_gpio_irqchip);
+		/* if configured as edge, then will be changed to do_edge_IRQ */
+		set_irq_handler(irq, handle_level_irq);
+	}
+#endif
+	bfin_write_IMASK(0);
+	CSYNC();
+	ilat = bfin_read_ILAT();
+	CSYNC();
+	bfin_write_ILAT(ilat);
+	CSYNC();
+
+	printk(KERN_INFO
+	       "Configuring Blackfin Priority Driven Interrupts\n");
+	/* IMASK=xxx is equivalent to STI xx or irq_flags=xx,
+	 * local_irq_enable()
+	 */
+	program_IAR();
+	/* Therefore it's better to setup IARs before interrupts enabled */
+	search_IAR();
+
+	/* Enable interrupts IVG7-15 */
+	irq_flags = irq_flags | IMASK_IVG15 |
+	    IMASK_IVG14 | IMASK_IVG13 | IMASK_IVG12 | IMASK_IVG11 |
+	    IMASK_IVG10 | IMASK_IVG9 | IMASK_IVG8 | IMASK_IVG7 |
+	    IMASK_IVGHW;
+
+	return 0;
+}
+
+#ifdef CONFIG_DO_IRQ_L1
+void do_irq(int vec, struct pt_regs *fp)__attribute__((l1_text));
+#endif
+
+void do_irq(int vec, struct pt_regs *fp)
+{
+	if (vec == EVT_IVTMR_P) {
+		vec = IRQ_CORETMR;
+	} else {
+		struct ivgx *ivg = ivg7_13[vec - IVG7].ifirst;
+		struct ivgx *ivg_stop = ivg7_13[vec - IVG7].istop;
+		unsigned long sic_status;
+
+		SSYNC();
+		sic_status = bfin_read_SIC_IMASK() & bfin_read_SIC_ISR();
+
+		for (;; ivg++) {
+			if (ivg >= ivg_stop) {
+				atomic_inc(&num_spurious);
+				return;
+			} else if (sic_status & ivg->isrflag)
+				break;
+		}
+		vec = ivg->irqno;
+	}
+	asm_do_IRQ(vec, fp);
+
+#ifdef CONFIG_KGDB
+	kgdb_process_breakpoint();
+#endif
+}