Blackfin arch: initial supporting for BF548-EZKIT

The ADSP-BF54x was specifically designed to meet the needs of convergent multimedia
applications where system performance and cost are essential ingredients. The
integration of multimedia, human interface, and connectivity peripherals combined
with increased system bandwidth and on-chip memory provides customers a platform to
design the most demanding applications.

Since now, ADSP-BF54x will be supported in the Linux kernel and bunch of related drivers
such as USB OTG, ATAPI, NAND flash controller, LCD framebuffer, sound, touch screen will
be submitted later.

Please enjoy the show.

Signed-off-by: Roy Huang <roy.huang@analog.com>
Signed-off-by: Bryan Wu <bryan.wu@analog.com>

1 files changed, 175 insertions, 0 deletions

diff --git a/arch/blackfin/mach-bf548/gpio.c b/arch/blackfin/mach-bf548/gpio.c
new file mode 100644
index 000000000000..854896d6ceda
--- /dev/null
+++ b/arch/blackfin/mach-bf548/gpio.c
@@ -0,0 +1,175 @@
+/*
+ * File:         arch/blackfin/mach-bf548/gpio.c
+ * Based on:
+ * Author:       Michael Hennerich (hennerich@blackfin.uclinux.org)
+ *
+ * Created:
+ * Description:  GPIO Abstraction Layer
+ *
+ * Modified:
+ *               Copyright 2007 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/err.h>
+#include <asm/blackfin.h>
+#include <asm/gpio.h>
+#include <linux/irq.h>
+
+static struct gpio_port_t *gpio_array[gpio_bank(MAX_BLACKFIN_GPIOS)] = {
+	(struct gpio_port_t *) PORTA_FER,
+	(struct gpio_port_t *) PORTB_FER,
+	(struct gpio_port_t *) PORTC_FER,
+	(struct gpio_port_t *) PORTD_FER,
+	(struct gpio_port_t *) PORTE_FER,
+	(struct gpio_port_t *) PORTF_FER,
+	(struct gpio_port_t *) PORTG_FER,
+	(struct gpio_port_t *) PORTH_FER,
+	(struct gpio_port_t *) PORTI_FER,
+	(struct gpio_port_t *) PORTJ_FER,
+};
+
+static unsigned short reserved_map[gpio_bank(MAX_BLACKFIN_GPIOS)];
+
+inline int check_gpio(unsigned short gpio)
+{
+	if (gpio == GPIO_PB15 || gpio == GPIO_PC14 || gpio == GPIO_PC15 \
+			|| gpio == GPIO_PH14 || gpio == GPIO_PH15 \
+			|| gpio > MAX_BLACKFIN_GPIOS)
+		return -EINVAL;
+	return 0;
+}
+
+static void port_setup(unsigned short gpio, unsigned short usage)
+{
+	if (usage == GPIO_USAGE) {
+		if (gpio_array[gpio_bank(gpio)]->port_fer & gpio_bit(gpio))
+			printk(KERN_WARNING "bfin-gpio: Possible Conflict with Peripheral "
+			       "usage and GPIO %d detected!\n", gpio);
+		gpio_array[gpio_bank(gpio)]->port_fer &= ~gpio_bit(gpio);
+	} else
+		gpio_array[gpio_bank(gpio)]->port_fer |= gpio_bit(gpio);
+	SSYNC();
+}
+
+static int __init bfin_gpio_init(void)
+{
+	int i;
+
+	printk(KERN_INFO "Blackfin GPIO Controller\n");
+
+	for (i = 0; i < MAX_BLACKFIN_GPIOS; i+=GPIO_BANKSIZE)
+		reserved_map[gpio_bank(i)] = 0;
+
+	return 0;
+}
+
+arch_initcall(bfin_gpio_init);
+
+
+/***********************************************************
+*
+* FUNCTIONS: Blackfin GPIO Driver
+*
+* INPUTS/OUTPUTS:
+* gpio - GPIO Number between 0 and MAX_BLACKFIN_GPIOS
+*
+*
+* DESCRIPTION: Blackfin GPIO Driver API
+*
+* CAUTION:
+*************************************************************
+* MODIFICATION HISTORY :
+**************************************************************/
+
+int gpio_request(unsigned short gpio, const char *label)
+{
+	unsigned long flags;
+
+	if (check_gpio(gpio) < 0)
+		return -EINVAL;
+
+	local_irq_save(flags);
+
+	if (unlikely(reserved_map[gpio_bank(gpio)] & gpio_bit(gpio))) {
+		printk(KERN_ERR "bfin-gpio: GPIO %d is already reserved!\n", gpio);
+		dump_stack();
+		local_irq_restore(flags);
+		return -EBUSY;
+	}
+	reserved_map[gpio_bank(gpio)] |= gpio_bit(gpio);
+
+	local_irq_restore(flags);
+
+	port_setup(gpio, GPIO_USAGE);
+
+	return 0;
+}
+EXPORT_SYMBOL(gpio_request);
+
+
+void gpio_free(unsigned short gpio)
+{
+	unsigned long flags;
+
+	if (check_gpio(gpio) < 0)
+		return;
+
+	local_irq_save(flags);
+
+	if (unlikely(!(reserved_map[gpio_bank(gpio)] & gpio_bit(gpio)))) {
+		printk(KERN_ERR "bfin-gpio: GPIO %d wasn't reserved!\n", gpio);
+		dump_stack();
+		local_irq_restore(flags);
+		return;
+	}
+
+	reserved_map[gpio_bank(gpio)] &= ~gpio_bit(gpio);
+
+	local_irq_restore(flags);
+}
+EXPORT_SYMBOL(gpio_free);
+
+
+void gpio_direction_input(unsigned short gpio)
+{
+	unsigned long flags;
+
+	BUG_ON(!(reserved_map[gpio_bank(gpio)] & gpio_bit(gpio)));
+
+	local_irq_save(flags);
+	gpio_array[gpio_bank(gpio)]->port_dir_clear = gpio_bit(gpio);
+	gpio_array[gpio_bank(gpio)]->port_inen |= gpio_bit(gpio);
+	local_irq_restore(flags);
+}
+EXPORT_SYMBOL(gpio_direction_input);
+
+void gpio_direction_output(unsigned short gpio)
+{
+	unsigned long flags;
+
+	BUG_ON(!(reserved_map[gpio_bank(gpio)] & gpio_bit(gpio)));
+
+	local_irq_save(flags);
+	gpio_array[gpio_bank(gpio)]->port_inen &= ~gpio_bit(gpio);
+	gpio_array[gpio_bank(gpio)]->port_dir_set = gpio_bit(gpio);
+	local_irq_restore(flags);
+}
+EXPORT_SYMBOL(gpio_direction_output);