MIPS: Add support for Texas Instruments AR7 System-on-a-Chip

This patch adds support for the Texas Instruments AR7 System-on-a-Chip.
It supports the TNETD7100, 7200 and 7300 versions of the SoC.

Signed-off-by: Matteo Croce <matteo@openwrt.org>
Signed-off-by: Felix Fietkau <nbd@openwrt.org>
Signed-off-by: Eugene Konev <ejka@openwrt.org>
Signed-off-by: Nicolas Thill <nico@openwrt.org>
Signed-off-by: Florian Fainelli <florian@openwrt.org>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

6 files changed, 376 insertions, 0 deletions

diff --git a/arch/mips/include/asm/mach-ar7/ar7.h b/arch/mips/include/asm/mach-ar7/ar7.h
new file mode 100644
index 000000000000..de71694614de
--- /dev/null
+++ b/arch/mips/include/asm/mach-ar7/ar7.h
@@ -0,0 +1,178 @@
+/*
+ * Copyright (C) 2006,2007 Felix Fietkau <nbd@openwrt.org>
+ * Copyright (C) 2006,2007 Eugene Konev <ejka@openwrt.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, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+
+#ifndef __AR7_H__
+#define __AR7_H__
+
+#include <linux/delay.h>
+#include <linux/io.h>
+#include <linux/errno.h>
+
+#include <asm/addrspace.h>
+
+#define AR7_SDRAM_BASE  0x14000000
+
+#define AR7_REGS_BASE   0x08610000
+
+#define AR7_REGS_MAC0   (AR7_REGS_BASE + 0x0000)
+#define AR7_REGS_GPIO   (AR7_REGS_BASE + 0x0900)
+/* 0x08610A00 - 0x08610BFF (512 bytes, 128 bytes / clock) */
+#define AR7_REGS_POWER  (AR7_REGS_BASE + 0x0a00)
+#define AR7_REGS_CLOCKS (AR7_REGS_POWER + 0x80)
+#define UR8_REGS_CLOCKS (AR7_REGS_POWER + 0x20)
+#define AR7_REGS_UART0  (AR7_REGS_BASE + 0x0e00)
+#define AR7_REGS_USB    (AR7_REGS_BASE + 0x1200)
+#define AR7_REGS_RESET  (AR7_REGS_BASE + 0x1600)
+#define AR7_REGS_VLYNQ0 (AR7_REGS_BASE + 0x1800)
+#define AR7_REGS_DCL    (AR7_REGS_BASE + 0x1a00)
+#define AR7_REGS_VLYNQ1 (AR7_REGS_BASE + 0x1c00)
+#define AR7_REGS_MDIO   (AR7_REGS_BASE + 0x1e00)
+#define AR7_REGS_IRQ    (AR7_REGS_BASE + 0x2400)
+#define AR7_REGS_MAC1   (AR7_REGS_BASE + 0x2800)
+
+#define AR7_REGS_WDT    (AR7_REGS_BASE + 0x1f00)
+#define UR8_REGS_WDT    (AR7_REGS_BASE + 0x0b00)
+#define UR8_REGS_UART1  (AR7_REGS_BASE + 0x0f00)
+
+#define AR7_RESET_PEREPHERIAL   0x0
+#define AR7_RESET_SOFTWARE      0x4
+#define AR7_RESET_STATUS        0x8
+
+#define AR7_RESET_BIT_CPMAC_LO  17
+#define AR7_RESET_BIT_CPMAC_HI  21
+#define AR7_RESET_BIT_MDIO      22
+#define AR7_RESET_BIT_EPHY      26
+
+/* GPIO control registers */
+#define AR7_GPIO_INPUT  0x0
+#define AR7_GPIO_OUTPUT 0x4
+#define AR7_GPIO_DIR    0x8
+#define AR7_GPIO_ENABLE 0xc
+
+#define AR7_CHIP_7100   0x18
+#define AR7_CHIP_7200   0x2b
+#define AR7_CHIP_7300   0x05
+
+/* Interrupts */
+#define AR7_IRQ_UART0   15
+#define AR7_IRQ_UART1   16
+
+/* Clocks */
+#define AR7_AFE_CLOCK   35328000
+#define AR7_REF_CLOCK   25000000
+#define AR7_XTAL_CLOCK  24000000
+
+struct plat_cpmac_data {
+        int reset_bit;
+        int power_bit;
+        u32 phy_mask;
+        char dev_addr[6];
+};
+
+struct plat_dsl_data {
+        int reset_bit_dsl;
+        int reset_bit_sar;
+};
+
+extern int ar7_cpu_clock, ar7_bus_clock, ar7_dsp_clock;
+
+static inline u16 ar7_chip_id(void)
+{
+        return readl((void *)KSEG1ADDR(AR7_REGS_GPIO + 0x14)) & 0xffff;
+}
+
+static inline u8 ar7_chip_rev(void)
+{
+        return (readl((void *)KSEG1ADDR(AR7_REGS_GPIO + 0x14)) >> 16) & 0xff;
+}
+
+static inline int ar7_cpu_freq(void)
+{
+        return ar7_cpu_clock;
+}
+
+static inline int ar7_bus_freq(void)
+{
+        return ar7_bus_clock;
+}
+
+static inline int ar7_vbus_freq(void)
+{
+        return ar7_bus_clock / 2;
+}
+#define ar7_cpmac_freq ar7_vbus_freq
+
+static inline int ar7_dsp_freq(void)
+{
+        return ar7_dsp_clock;
+}
+
+static inline int ar7_has_high_cpmac(void)
+{
+        u16 chip_id = ar7_chip_id();
+        switch (chip_id) {
+        case AR7_CHIP_7100:
+        case AR7_CHIP_7200:
+                return 0;
+        case AR7_CHIP_7300:
+                return 1;
+        default:
+                return -ENXIO;
+        }
+}
+#define ar7_has_high_vlynq ar7_has_high_cpmac
+#define ar7_has_second_uart ar7_has_high_cpmac
+
+static inline void ar7_device_enable(u32 bit)
+{
+        void *reset_reg =
+                (void *)KSEG1ADDR(AR7_REGS_RESET + AR7_RESET_PEREPHERIAL);
+        writel(readl(reset_reg) | (1 << bit), reset_reg);
+        msleep(20);
+}
+
+static inline void ar7_device_disable(u32 bit)
+{
+        void *reset_reg =
+                (void *)KSEG1ADDR(AR7_REGS_RESET + AR7_RESET_PEREPHERIAL);
+        writel(readl(reset_reg) & ~(1 << bit), reset_reg);
+        msleep(20);
+}
+
+static inline void ar7_device_reset(u32 bit)
+{
+        ar7_device_disable(bit);
+        ar7_device_enable(bit);
+}
+
+static inline void ar7_device_on(u32 bit)
+{
+        void *power_reg = (void *)KSEG1ADDR(AR7_REGS_POWER);
+        writel(readl(power_reg) | (1 << bit), power_reg);
+        msleep(20);
+}
+
+static inline void ar7_device_off(u32 bit)
+{
+        void *power_reg = (void *)KSEG1ADDR(AR7_REGS_POWER);
+        writel(readl(power_reg) & ~(1 << bit), power_reg);
+        msleep(20);
+}
+
+#endif /* __AR7_H__ */
diff --git a/arch/mips/include/asm/mach-ar7/gpio.h b/arch/mips/include/asm/mach-ar7/gpio.h
new file mode 100644
index 000000000000..cbe9c4f126df
--- /dev/null
+++ b/arch/mips/include/asm/mach-ar7/gpio.h
@@ -0,0 +1,110 @@
+/*
+ * Copyright (C) 2007 Florian Fainelli <florian@openwrt.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, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+
+#ifndef __AR7_GPIO_H__
+#define __AR7_GPIO_H__
+
+#include <asm/mach-ar7/ar7.h>
+
+#define AR7_GPIO_MAX 32
+
+extern int gpio_request(unsigned gpio, const char *label);
+extern void gpio_free(unsigned gpio);
+
+/* Common GPIO layer */
+static inline int gpio_get_value(unsigned gpio)
+{
+        void __iomem *gpio_in =
+                (void __iomem *)KSEG1ADDR(AR7_REGS_GPIO + AR7_GPIO_INPUT);
+
+        return readl(gpio_in) & (1 << gpio);
+}
+
+static inline void gpio_set_value(unsigned gpio, int value)
+{
+        void __iomem *gpio_out =
+                (void __iomem *)KSEG1ADDR(AR7_REGS_GPIO + AR7_GPIO_OUTPUT);
+        unsigned tmp;
+
+        tmp = readl(gpio_out) & ~(1 << gpio);
+        if (value)
+                tmp |= 1 << gpio;
+        writel(tmp, gpio_out);
+}
+
+static inline int gpio_direction_input(unsigned gpio)
+{
+        void __iomem *gpio_dir =
+                (void __iomem *)KSEG1ADDR(AR7_REGS_GPIO + AR7_GPIO_DIR);
+
+        if (gpio >= AR7_GPIO_MAX)
+                return -EINVAL;
+
+        writel(readl(gpio_dir) | (1 << gpio), gpio_dir);
+
+        return 0;
+}
+
+static inline int gpio_direction_output(unsigned gpio, int value)
+{
+        void __iomem *gpio_dir =
+                (void __iomem *)KSEG1ADDR(AR7_REGS_GPIO + AR7_GPIO_DIR);
+
+        if (gpio >= AR7_GPIO_MAX)
+                return -EINVAL;
+
+        gpio_set_value(gpio, value);
+        writel(readl(gpio_dir) & ~(1 << gpio), gpio_dir);
+
+        return 0;
+}
+
+static inline int gpio_to_irq(unsigned gpio)
+{
+        return -EINVAL;
+}
+
+static inline int irq_to_gpio(unsigned irq)
+{
+        return -EINVAL;
+}
+
+/* Board specific GPIO functions */
+static inline int ar7_gpio_enable(unsigned gpio)
+{
+        void __iomem *gpio_en =
+                (void __iomem *)KSEG1ADDR(AR7_REGS_GPIO + AR7_GPIO_ENABLE);
+
+        writel(readl(gpio_en) | (1 << gpio), gpio_en);
+
+        return 0;
+}
+
+static inline int ar7_gpio_disable(unsigned gpio)
+{
+        void __iomem *gpio_en =
+                (void __iomem *)KSEG1ADDR(AR7_REGS_GPIO + AR7_GPIO_ENABLE);
+
+        writel(readl(gpio_en) & ~(1 << gpio), gpio_en);
+
+        return 0;
+}
+
+#include <asm-generic/gpio.h>
+
+#endif
diff --git a/arch/mips/include/asm/mach-ar7/irq.h b/arch/mips/include/asm/mach-ar7/irq.h
new file mode 100644
index 000000000000..39e9757e3d93
--- /dev/null
+++ b/arch/mips/include/asm/mach-ar7/irq.h
@@ -0,0 +1,16 @@
+/*
+ * 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.
+ *
+ * Shamelessly copied from asm-mips/mach-emma2rh/
+ * Copyright (C) 2003 by Ralf Baechle
+ */
+#ifndef __ASM_AR7_IRQ_H
+#define __ASM_AR7_IRQ_H
+
+#define NR_IRQS 256
+
+#include_next <irq.h>
+
+#endif /* __ASM_AR7_IRQ_H */
diff --git a/arch/mips/include/asm/mach-ar7/prom.h b/arch/mips/include/asm/mach-ar7/prom.h
new file mode 100644
index 000000000000..088f61fe85ea
--- /dev/null
+++ b/arch/mips/include/asm/mach-ar7/prom.h
@@ -0,0 +1,25 @@
+/*
+ * Copyright (C) 2006, 2007 Florian Fainelli <florian@openwrt.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, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+
+#ifndef __PROM_H__
+#define __PROM_H__
+
+extern char *prom_getenv(const char *name);
+extern void prom_meminit(void);
+
+#endif /* __PROM_H__ */
diff --git a/arch/mips/include/asm/mach-ar7/spaces.h b/arch/mips/include/asm/mach-ar7/spaces.h
new file mode 100644
index 000000000000..ac28f273449c
--- /dev/null
+++ b/arch/mips/include/asm/mach-ar7/spaces.h
@@ -0,0 +1,22 @@
+/*
+ * 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) 1994 - 1999, 2000, 03, 04 Ralf Baechle
+ * Copyright (C) 2000, 2002  Maciej W. Rozycki
+ * Copyright (C) 1990, 1999, 2000 Silicon Graphics, Inc.
+ */
+#ifndef _ASM_AR7_SPACES_H
+#define _ASM_AR7_SPACES_H
+
+/*
+ * This handles the memory map.
+ * We handle pages at KSEG0 for kernels with 32 bit address space.
+ */
+#define PAGE_OFFSET             0x94000000UL
+#define PHYS_OFFSET             0x14000000UL
+
+#include <asm/mach-generic/spaces.h>
+
+#endif /* __ASM_AR7_SPACES_H */
diff --git a/arch/mips/include/asm/mach-ar7/war.h b/arch/mips/include/asm/mach-ar7/war.h
new file mode 100644
index 000000000000..f4862b563080
--- /dev/null
+++ b/arch/mips/include/asm/mach-ar7/war.h
@@ -0,0 +1,25 @@
+/*
+ * 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) 2002, 2004, 2007 by Ralf Baechle <ralf@linux-mips.org>
+ */
+#ifndef __ASM_MIPS_MACH_AR7_WAR_H
+#define __ASM_MIPS_MACH_AR7_WAR_H
+
+#define R4600_V1_INDEX_ICACHEOP_WAR     0
+#define R4600_V1_HIT_CACHEOP_WAR        0
+#define R4600_V2_HIT_CACHEOP_WAR        0
+#define R5432_CP0_INTERRUPT_WAR         0
+#define BCM1250_M3_WAR                  0
+#define SIBYTE_1956_WAR                 0
+#define MIPS4K_ICACHE_REFILL_WAR        0
+#define MIPS_CACHE_SYNC_WAR             0
+#define TX49XX_ICACHE_INDEX_INV_WAR     0
+#define RM9000_CDEX_SMP_WAR             0
+#define ICACHE_REFILLS_WORKAROUND_WAR   0
+#define R10000_LLSC_WAR                 0
+#define MIPS34K_MISSED_ITLB_WAR         0
+
+#endif /* __ASM_MIPS_MACH_AR7_WAR_H */