xtensa: s6000 variant
Support for the Stretch S6000 Xtensa core variant.
Signed-off-by: Johannes Weiner <jw@emlix.com>
Signed-off-by: Oskar Schirmer <os@emlix.com>
Signed-off-by: Chris Zankel <chris@zankel.net>
diff --git a/arch/xtensa/Kconfig b/arch/xtensa/Kconfig
index 705bb71..0b7cd52 100644
--- a/arch/xtensa/Kconfig
+++ b/arch/xtensa/Kconfig
@@ -32,6 +32,9 @@
config GENERIC_HARDIRQS
def_bool y
+config GENERIC_GPIO
+ def_bool y
+
config ARCH_HAS_ILOG2_U32
def_bool n
@@ -69,6 +72,11 @@
select MMU
help
This variant refers to Tensilica's Diamond 232L Standard core Rev.B (LE).
+
+config XTENSA_VARIANT_S6000
+ bool "s6000 - Stretch software configurable processor"
+ select VARIANT_IRQ_SWITCH
+ select ARCH_REQUIRE_GPIOLIB
endchoice
config XTENSA_UNALIGNED_USER
diff --git a/arch/xtensa/Makefile b/arch/xtensa/Makefile
index 6d7f60e..8f97a86 100644
--- a/arch/xtensa/Makefile
+++ b/arch/xtensa/Makefile
@@ -15,6 +15,7 @@
variant-$(CONFIG_XTENSA_VARIANT_FSF) := fsf
variant-$(CONFIG_XTENSA_VARIANT_DC232B) := dc232b
+variant-$(CONFIG_XTENSA_VARIANT_S6000) := s6000
variant-$(CONFIG_XTENSA_VARIANT_LINUX_CUSTOM) := custom
VARIANT = $(variant-y)
diff --git a/arch/xtensa/include/asm/gpio.h b/arch/xtensa/include/asm/gpio.h
new file mode 100644
index 0000000..0763b07
--- /dev/null
+++ b/arch/xtensa/include/asm/gpio.h
@@ -0,0 +1,56 @@
+/*
+ * Generic GPIO API implementation for xtensa.
+ *
+ * Stolen from x86, which is derived from the generic GPIO API for powerpc:
+ *
+ * Copyright (c) 2007-2008 MontaVista Software, Inc.
+ *
+ * Author: Anton Vorontsov <avorontsov@ru.mvista.com>
+ *
+ * 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.
+ */
+
+#ifndef _ASM_XTENSA_GPIO_H
+#define _ASM_XTENSA_GPIO_H
+
+#include <asm-generic/gpio.h>
+
+#ifdef CONFIG_GPIOLIB
+
+/*
+ * Just call gpiolib.
+ */
+static inline int gpio_get_value(unsigned int gpio)
+{
+ return __gpio_get_value(gpio);
+}
+
+static inline void gpio_set_value(unsigned int gpio, int value)
+{
+ __gpio_set_value(gpio, value);
+}
+
+static inline int gpio_cansleep(unsigned int gpio)
+{
+ return __gpio_cansleep(gpio);
+}
+
+/*
+ * Not implemented, yet.
+ */
+static inline int gpio_to_irq(unsigned int gpio)
+{
+ return -ENOSYS;
+}
+
+static inline int irq_to_gpio(unsigned int irq)
+{
+ return -EINVAL;
+}
+
+#endif /* CONFIG_GPIOLIB */
+
+#endif /* _ASM_XTENSA_GPIO_H */
diff --git a/arch/xtensa/variants/s6000/Makefile b/arch/xtensa/variants/s6000/Makefile
new file mode 100644
index 0000000..03b3975
--- /dev/null
+++ b/arch/xtensa/variants/s6000/Makefile
@@ -0,0 +1,3 @@
+# s6000 Makefile
+
+obj-y += irq.o gpio.o
diff --git a/arch/xtensa/variants/s6000/gpio.c b/arch/xtensa/variants/s6000/gpio.c
new file mode 100644
index 0000000..33a8d95
--- /dev/null
+++ b/arch/xtensa/variants/s6000/gpio.c
@@ -0,0 +1,71 @@
+/*
+ * s6000 gpio driver
+ *
+ * Copyright (c) 2009 emlix GmbH
+ * Authors: Oskar Schirmer <os@emlix.com>
+ * Johannes Weiner <jw@emlix.com>
+ */
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/io.h>
+#include <linux/gpio.h>
+
+#include <variant/hardware.h>
+
+#define S6_GPIO_DATA 0x000
+#define S6_GPIO_IS 0x404
+#define S6_GPIO_IBE 0x408
+#define S6_GPIO_IEV 0x40C
+#define S6_GPIO_IE 0x410
+#define S6_GPIO_RIS 0x414
+#define S6_GPIO_MIS 0x418
+#define S6_GPIO_IC 0x41C
+#define S6_GPIO_AFSEL 0x420
+#define S6_GPIO_DIR 0x800
+#define S6_GPIO_BANK(nr) ((nr) * 0x1000)
+#define S6_GPIO_MASK(nr) (4 << (nr))
+#define S6_GPIO_OFFSET(nr) \
+ (S6_GPIO_BANK((nr) >> 3) + S6_GPIO_MASK((nr) & 7))
+
+static int direction_input(struct gpio_chip *chip, unsigned int off)
+{
+ writeb(0, S6_REG_GPIO + S6_GPIO_DIR + S6_GPIO_OFFSET(off));
+ return 0;
+}
+
+static int get(struct gpio_chip *chip, unsigned int off)
+{
+ return readb(S6_REG_GPIO + S6_GPIO_DATA + S6_GPIO_OFFSET(off));
+}
+
+static int direction_output(struct gpio_chip *chip, unsigned int off, int val)
+{
+ unsigned rel = S6_GPIO_OFFSET(off);
+ writeb(~0, S6_REG_GPIO + S6_GPIO_DIR + rel);
+ writeb(val ? ~0 : 0, S6_REG_GPIO + S6_GPIO_DATA + rel);
+ return 0;
+}
+
+static void set(struct gpio_chip *chip, unsigned int off, int val)
+{
+ writeb(val ? ~0 : 0, S6_REG_GPIO + S6_GPIO_DATA + S6_GPIO_OFFSET(off));
+}
+
+static struct gpio_chip gpiochip = {
+ .owner = THIS_MODULE,
+ .direction_input = direction_input,
+ .get = get,
+ .direction_output = direction_output,
+ .set = set,
+ .base = 0,
+ .ngpio = 24,
+ .can_sleep = 0, /* no blocking io needed */
+ .exported = 0, /* no exporting to userspace */
+};
+
+static int gpio_init(void)
+{
+ return gpiochip_add(&gpiochip);
+}
+device_initcall(gpio_init);
diff --git a/arch/xtensa/variants/s6000/include/variant/hardware.h b/arch/xtensa/variants/s6000/include/variant/hardware.h
new file mode 100644
index 0000000..5d9ba09
--- /dev/null
+++ b/arch/xtensa/variants/s6000/include/variant/hardware.h
@@ -0,0 +1,259 @@
+#ifndef __XTENSA_S6000_HARDWARE_H
+#define __XTENSA_S6000_HARDWARE_H
+
+#define S6_SCLK 1843200
+
+#define S6_MEM_REG 0x20000000
+#define S6_MEM_EFI 0x33F00000
+#define S6_MEM_PCIE_DATARAM1 0x34000000
+#define S6_MEM_XLMI 0x37F80000
+#define S6_MEM_PIF_DATARAM1 0x37FFC000
+#define S6_MEM_GMAC 0x38000000
+#define S6_MEM_I2S 0x3A000000
+#define S6_MEM_EGIB 0x3C000000
+#define S6_MEM_PCIE_CFG 0x3E000000
+#define S6_MEM_PIF_DATARAM 0x3FFE0000
+#define S6_MEM_XLMI_DATARAM 0x3FFF0000
+#define S6_MEM_DDR 0x40000000
+#define S6_MEM_PCIE_APER 0xC0000000
+#define S6_MEM_AUX 0xF0000000
+
+/* Device addresses */
+
+#define S6_REG_SCB S6_MEM_REG
+#define S6_REG_NB (S6_REG_SCB + 0x10000)
+#define S6_REG_LMSDMA (S6_REG_SCB + 0x20000)
+#define S6_REG_NI (S6_REG_SCB + 0x30000)
+#define S6_REG_NIDMA (S6_REG_SCB + 0x40000)
+#define S6_REG_NS (S6_REG_SCB + 0x50000)
+#define S6_REG_DDR (S6_REG_SCB + 0x60000)
+#define S6_REG_GREG1 (S6_REG_SCB + 0x70000)
+#define S6_REG_DP (S6_REG_SCB + 0x80000)
+#define S6_REG_DPDMA (S6_REG_SCB + 0x90000)
+#define S6_REG_EGIB (S6_REG_SCB + 0xA0000)
+#define S6_REG_PCIE (S6_REG_SCB + 0xB0000)
+#define S6_REG_I2S (S6_REG_SCB + 0xC0000)
+#define S6_REG_GMAC (S6_REG_SCB + 0xD0000)
+#define S6_REG_HIFDMA (S6_REG_SCB + 0xE0000)
+#define S6_REG_GREG2 (S6_REG_SCB + 0xF0000)
+
+#define S6_REG_APB S6_REG_SCB
+#define S6_REG_UART (S6_REG_APB + 0x0000)
+#define S6_REG_INTC (S6_REG_APB + 0x2000)
+#define S6_REG_SPI (S6_REG_APB + 0x3000)
+#define S6_REG_I2C (S6_REG_APB + 0x4000)
+#define S6_REG_GPIO (S6_REG_APB + 0x8000)
+
+/* Global register block */
+
+#define S6_GREG1_PLL_LOCKCLEAR 0x000
+#define S6_GREG1_PLL_LOCK_SYS 0
+#define S6_GREG1_PLL_LOCK_IO 1
+#define S6_GREG1_PLL_LOCK_AIM 2
+#define S6_GREG1_PLL_LOCK_DP0 3
+#define S6_GREG1_PLL_LOCK_DP2 4
+#define S6_GREG1_PLL_LOCK_DDR 5
+#define S6_GREG1_PLL_LOCKSTAT 0x004
+#define S6_GREG1_PLL_LOCKSTAT_CURLOCK 0
+#define S6_GREG1_PLL_LOCKSTAT_EVERUNLCK 8
+#define S6_GREG1_PLLSEL 0x010
+#define S6_GREG1_PLLSEL_AIM 0
+#define S6_GREG1_PLLSEL_AIM_DDR2 0
+#define S6_GREG1_PLLSEL_AIM_300MHZ 1
+#define S6_GREG1_PLLSEL_AIM_240MHZ 2
+#define S6_GREG1_PLLSEL_AIM_200MHZ 3
+#define S6_GREG1_PLLSEL_AIM_150MHZ 4
+#define S6_GREG1_PLLSEL_AIM_120MHZ 5
+#define S6_GREG1_PLLSEL_AIM_40MHZ 6
+#define S6_GREG1_PLLSEL_AIM_PLLAIMREF 7
+#define S6_GREG1_PLLSEL_AIM_MASK 7
+#define S6_GREG1_PLLSEL_DDR 8
+#define S6_GREG1_PLLSEL_DDR_HS 0
+#define S6_GREG1_PLLSEL_DDR_333MHZ 1
+#define S6_GREG1_PLLSEL_DDR_250MHZ 2
+#define S6_GREG1_PLLSEL_DDR_200MHZ 3
+#define S6_GREG1_PLLSEL_DDR_167MHZ 4
+#define S6_GREG1_PLLSEL_DDR_100MHZ 5
+#define S6_GREG1_PLLSEL_DDR_33MHZ 6
+#define S6_GREG1_PLLSEL_DDR_PLLIOREF 7
+#define S6_GREG1_PLLSEL_DDR_MASK 7
+#define S6_GREG1_PLLSEL_GMAC 16
+#define S6_GREG1_PLLSEL_GMAC_125MHZ 0
+#define S6_GREG1_PLLSEL_GMAC_25MHZ 1
+#define S6_GREG1_PLLSEL_GMAC_2500KHZ 2
+#define S6_GREG1_PLLSEL_GMAC_EXTERN 3
+#define S6_GREG1_PLLSEL_GMAC_MASK 3
+#define S6_GREG1_PLLSEL_GMII 18
+#define S6_GREG1_PLLSEL_GMII_111MHZ 0
+#define S6_GREG1_PLLSEL_GMII_IOREF 1
+#define S6_GREG1_PLLSEL_GMII_NONE 2
+#define S6_GREG1_PLLSEL_GMII_125MHZ 3
+#define S6_GREG1_PLLSEL_GMII_MASK 3
+#define S6_GREG1_SYSUNLOCKCNT 0x020
+#define S6_GREG1_IOUNLOCKCNT 0x024
+#define S6_GREG1_AIMUNLOCKCNT 0x028
+#define S6_GREG1_DP0UNLOCKCNT 0x02C
+#define S6_GREG1_DP2UNLOCKCNT 0x030
+#define S6_GREG1_DDRUNLOCKCNT 0x034
+#define S6_GREG1_CLKBAL0 0x040
+#define S6_GREG1_CLKBAL0_LSGB 0
+#define S6_GREG1_CLKBAL0_LSPX 8
+#define S6_GREG1_CLKBAL0_MEMDO 16
+#define S6_GREG1_CLKBAL0_HSXT1 24
+#define S6_GREG1_CLKBAL1 0x044
+#define S6_GREG1_CLKBAL1_HSISEF 0
+#define S6_GREG1_CLKBAL1_HSNI 8
+#define S6_GREG1_CLKBAL1_HSNS 16
+#define S6_GREG1_CLKBAL1_HSISEFCFG 24
+#define S6_GREG1_CLKBAL2 0x048
+#define S6_GREG1_CLKBAL2_LSNB 0
+#define S6_GREG1_CLKBAL2_LSSB 8
+#define S6_GREG1_CLKBAL2_LSREST 24
+#define S6_GREG1_CLKBAL3 0x04C
+#define S6_GREG1_CLKBAL3_ISEFXAD 0
+#define S6_GREG1_CLKBAL3_ISEFLMS 8
+#define S6_GREG1_CLKBAL3_ISEFISEF 16
+#define S6_GREG1_CLKBAL3_DDRDD 24
+#define S6_GREG1_CLKBAL4 0x050
+#define S6_GREG1_CLKBAL4_DDRDP 0
+#define S6_GREG1_CLKBAL4_DDRDO 8
+#define S6_GREG1_CLKBAL4_DDRNB 16
+#define S6_GREG1_CLKBAL4_DDRLMS 24
+#define S6_GREG1_BLOCKENA 0x100
+#define S6_GREG1_BLOCK_DDR 0
+#define S6_GREG1_BLOCK_DP 1
+#define S6_GREG1_BLOCK_NSNI 2
+#define S6_GREG1_BLOCK_PCIE 3
+#define S6_GREG1_BLOCK_GMAC 4
+#define S6_GREG1_BLOCK_I2S 5
+#define S6_GREG1_BLOCK_EGIB 6
+#define S6_GREG1_BLOCK_SB 7
+#define S6_GREG1_BLOCK_XT1 8
+#define S6_GREG1_CLKGATE 0x104
+#define S6_GREG1_BGATE_AIMNORTH 9
+#define S6_GREG1_BGATE_AIMEAST 10
+#define S6_GREG1_BGATE_AIMWEST 11
+#define S6_GREG1_BGATE_AIMSOUTH 12
+#define S6_GREG1_CHIPRES 0x108
+#define S6_GREG1_CHIPRES_SOFTRES 0
+#define S6_GREG1_CHIPRES_LOSTLOCK 1
+#define S6_GREG1_RESETCAUSE 0x10C
+#define S6_GREG1_RESETCAUSE_RESETN 0
+#define S6_GREG1_RESETCAUSE_GLOBAL 1
+#define S6_GREG1_RESETCAUSE_WDOGTIMER 2
+#define S6_GREG1_RESETCAUSE_SWCHIP 3
+#define S6_GREG1_RESETCAUSE_PLLSYSLOSS 4
+#define S6_GREG1_RESETCAUSE_PCIE 5
+#define S6_GREG1_RESETCAUSE_CREATEDGLOB 6
+#define S6_GREG1_REFCLOCKCNT 0x110
+#define S6_GREG1_RESETTIMER 0x114
+#define S6_GREG1_NMITIMER 0x118
+#define S6_GREG1_GLOBAL_TIMER 0x11C
+#define S6_GREG1_TIMER0 0x180
+#define S6_GREG1_TIMER1 0x184
+#define S6_GREG1_UARTCLOCKSEL 0x204
+#define S6_GREG1_CHIPVERSPACKG 0x208
+#define S6_GREG1_CHIPVERSPACKG_CHIPVID 0
+#define S6_GREG1_CHIPVERSPACKG_PACKSEL 8
+#define S6_GREG1_ONDIETERMCTRL 0x20C
+#define S6_GREG1_ONDIETERMCTRL_WEST 0
+#define S6_GREG1_ONDIETERMCTRL_NORTH 2
+#define S6_GREG1_ONDIETERMCTRL_EAST 4
+#define S6_GREG1_ONDIETERMCTRL_SOUTH 6
+#define S6_GREG1_ONDIETERMCTRL_NONE 0
+#define S6_GREG1_ONDIETERMCTRL_75OHM 2
+#define S6_GREG1_ONDIETERMCTRL_MASK 3
+#define S6_GREG1_BOOT_CFG0 0x210
+#define S6_GREG1_BOOT_CFG0_AIMSTRONG 1
+#define S6_GREG1_BOOT_CFG0_MINIBOOTDL 2
+#define S6_GREG1_BOOT_CFG0_OCDGPIO8SET 5
+#define S6_GREG1_BOOT_CFG0_OCDGPIOENA 6
+#define S6_GREG1_BOOT_CFG0_DOWNSTREAM 7
+#define S6_GREG1_BOOT_CFG0_PLLSYSDIV 8
+#define S6_GREG1_BOOT_CFG0_PLLSYSDIV_300MHZ 1
+#define S6_GREG1_BOOT_CFG0_PLLSYSDIV_240MHZ 2
+#define S6_GREG1_BOOT_CFG0_PLLSYSDIV_200MHZ 3
+#define S6_GREG1_BOOT_CFG0_PLLSYSDIV_150MHZ 4
+#define S6_GREG1_BOOT_CFG0_PLLSYSDIV_120MHZ 5
+#define S6_GREG1_BOOT_CFG0_PLLSYSDIV_40MHZ 6
+#define S6_GREG1_BOOT_CFG0_PLLSYSDIV_MASK 7
+#define S6_GREG1_BOOT_CFG0_BALHSLMS 12
+#define S6_GREG1_BOOT_CFG0_BALHSNB 18
+#define S6_GREG1_BOOT_CFG0_BALHSXAD 24
+#define S6_GREG1_BOOT_CFG1 0x214
+#define S6_GREG1_BOOT_CFG1_PCIE1LANE 1
+#define S6_GREG1_BOOT_CFG1_MPLLPRESCALE 2
+#define S6_GREG1_BOOT_CFG1_MPLLNCY 4
+#define S6_GREG1_BOOT_CFG1_MPLLNCY5 9
+#define S6_GREG1_BOOT_CFG1_BALHSREST 14
+#define S6_GREG1_BOOT_CFG1_BALHSPSMEMS 20
+#define S6_GREG1_BOOT_CFG1_BALLSGI 26
+#define S6_GREG1_BOOT_CFG2 0x218
+#define S6_GREG1_BOOT_CFG2_PEID 0
+#define S6_GREG1_BOOT_CFG3 0x21C
+#define S6_GREG1_DRAMBUSYHOLDOF 0x220
+#define S6_GREG1_DRAMBUSYHOLDOF_XT0 0
+#define S6_GREG1_DRAMBUSYHOLDOF_XT1 4
+#define S6_GREG1_DRAMBUSYHOLDOF_XT_MASK 7
+#define S6_GREG1_PCIEBAR1SIZE 0x224
+#define S6_GREG1_PCIEBAR2SIZE 0x228
+#define S6_GREG1_PCIEVENDOR 0x22C
+#define S6_GREG1_PCIEDEVICE 0x230
+#define S6_GREG1_PCIEREV 0x234
+#define S6_GREG1_PCIECLASS 0x238
+#define S6_GREG1_XT1DCACHEMISS 0x240
+#define S6_GREG1_XT1ICACHEMISS 0x244
+#define S6_GREG1_HWSEMAPHORE(n) (0x400 + 4 * (n))
+#define S6_GREG1_HWSEMAPHORE_NB 16
+
+/* peripheral interrupt numbers */
+
+#define S6_INTC_GPIO(n) (n) /* 0..3 */
+#define S6_INTC_I2C 4
+#define S6_INTC_SPI 5
+#define S6_INTC_NB_ERR 6
+#define S6_INTC_DMA_LMSERR 7
+#define S6_INTC_DMA_LMSLOWWMRK(n) (8 + (n)) /* 0..11 */
+#define S6_INTC_DMA_LMSPENDCNT(n) (20 + (n)) /* 0..11 */
+#define S6_INTC_DMA HOSTLOWWMRK(n) (32 + (n)) /* 0..6 */
+#define S6_INTC_DMA_HOSTPENDCNT(n) (39 + (n)) /* 0..6 */
+#define S6_INTC_DMA_HOSTERR 46
+#define S6_INTC_UART(n) (47 + (n)) /* 0..1 */
+#define S6_INTC_XAD 49
+#define S6_INTC_NI_ERR 50
+#define S6_INTC_NI_INFIFOFULL 51
+#define S6_INTC_DMA_NIERR 52
+#define S6_INTC_DMA_NILOWWMRK(n) (53 + (n)) /* 0..3 */
+#define S6_INTC_DMA_NIPENDCNT(n) (57 + (n)) /* 0..3 */
+#define S6_INTC_DDR 61
+#define S6_INTC_NS_ERR 62
+#define S6_INTC_EFI_CFGERR 63
+#define S6_INTC_EFI_ISEFTEST 64
+#define S6_INTC_EFI_WRITEERR 65
+#define S6_INTC_NMI_TIMER 66
+#define S6_INTC_PLLLOCK_SYS 67
+#define S6_INTC_PLLLOCK_IO 68
+#define S6_INTC_PLLLOCK_AIM 69
+#define S6_INTC_PLLLOCK_DP0 70
+#define S6_INTC_PLLLOCK_DP2 71
+#define S6_INTC_I2S_ERR 72
+#define S6_INTC_GMAC_STAT 73
+#define S6_INTC_GMAC_ERR 74
+#define S6_INTC_GIB_ERR 75
+#define S6_INTC_PCIE_ERR 76
+#define S6_INTC_PCIE_MSI(n) (77 + (n)) /* 0..3 */
+#define S6_INTC_PCIE_INTA 81
+#define S6_INTC_PCIE_INTB 82
+#define S6_INTC_PCIE_INTC 83
+#define S6_INTC_PCIE_INTD 84
+#define S6_INTC_SW(n) (85 + (n)) /* 0..9 */
+#define S6_INTC_SW_ENABLE(n) (85 + 256 + (n))
+#define S6_INTC_DMA_DP_ERR 95
+#define S6_INTC_DMA_DPLOWWMRK(n) (96 + (n)) /* 0..3 */
+#define S6_INTC_DMA_DPPENDCNT(n) (100 + (n)) /* 0..3 */
+#define S6_INTC_DMA_DPTERMCNT(n) (104 + (n)) /* 0..3 */
+#define S6_INTC_TIMER0 108
+#define S6_INTC_TIMER1 109
+#define S6_INTC_DMA_HOSTTERMCNT(n) (110 + (n)) /* 0..6 */
+
+#endif /* __XTENSA_S6000_HARDWARE_H */
diff --git a/arch/xtensa/variants/s6000/include/variant/irq.h b/arch/xtensa/variants/s6000/include/variant/irq.h
new file mode 100644
index 0000000..fa031cb
--- /dev/null
+++ b/arch/xtensa/variants/s6000/include/variant/irq.h
@@ -0,0 +1,9 @@
+#ifndef __XTENSA_S6000_IRQ_H
+#define __XTENSA_S6000_IRQ_H
+
+#define NO_IRQ (-1)
+
+extern void variant_irq_enable(unsigned int irq);
+extern void variant_irq_disable(unsigned int irq);
+
+#endif /* __XTENSA_S6000_IRQ_H */
diff --git a/arch/xtensa/variants/s6000/irq.c b/arch/xtensa/variants/s6000/irq.c
new file mode 100644
index 0000000..6651e32
--- /dev/null
+++ b/arch/xtensa/variants/s6000/irq.c
@@ -0,0 +1,74 @@
+/*
+ * s6000 irq crossbar
+ *
+ * Copyright (c) 2009 emlix GmbH
+ * Authors: Johannes Weiner <jw@emlix.com>
+ * Oskar Schirmer <os@emlix.com>
+ */
+#include <linux/io.h>
+#include <asm/irq.h>
+#include <variant/hardware.h>
+
+/* S6_REG_INTC */
+#define INTC_STATUS 0x000
+#define INTC_RAW 0x010
+#define INTC_STATUS_AG 0x100
+#define INTC_CFG(n) (0x200 + 4 * (n))
+
+/*
+ * The s6000 has a crossbar that multiplexes interrupt output lines
+ * from the peripherals to input lines on the xtensa core.
+ *
+ * We leave the mapping decisions to the platform as it depends on the
+ * actually connected peripherals which distribution makes sense.
+ */
+extern const signed char *platform_irq_mappings[NR_IRQS];
+
+static unsigned long scp_to_intc_enable[] = {
+#define TO_INTC_ENABLE(n) (((n) << 1) + 1)
+ TO_INTC_ENABLE(0),
+ TO_INTC_ENABLE(1),
+ TO_INTC_ENABLE(2),
+ TO_INTC_ENABLE(3),
+ TO_INTC_ENABLE(4),
+ TO_INTC_ENABLE(5),
+ TO_INTC_ENABLE(6),
+ TO_INTC_ENABLE(7),
+ TO_INTC_ENABLE(8),
+ TO_INTC_ENABLE(9),
+ TO_INTC_ENABLE(10),
+ TO_INTC_ENABLE(11),
+ TO_INTC_ENABLE(12),
+ -1,
+ -1,
+ TO_INTC_ENABLE(13),
+ -1,
+ TO_INTC_ENABLE(14),
+ -1,
+ TO_INTC_ENABLE(15),
+#undef TO_INTC_ENABLE
+};
+
+static void irq_set(unsigned int irq, int enable)
+{
+ unsigned long en;
+ const signed char *m = platform_irq_mappings[irq];
+
+ if (!m)
+ return;
+ en = enable ? scp_to_intc_enable[irq] : 0;
+ while (*m >= 0) {
+ writel(en, S6_REG_INTC + INTC_CFG(*m));
+ m++;
+ }
+}
+
+void variant_irq_enable(unsigned int irq)
+{
+ irq_set(irq, 1);
+}
+
+void variant_irq_disable(unsigned int irq)
+{
+ irq_set(irq, 0);
+}