diff options
Diffstat (limited to 'kernel/arch/cris/arch-v32/mach-fs/pinmux.c')
| -rw-r--r-- | kernel/arch/cris/arch-v32/mach-fs/pinmux.c | 323 |
1 files changed, 323 insertions, 0 deletions
diff --git a/kernel/arch/cris/arch-v32/mach-fs/pinmux.c b/kernel/arch/cris/arch-v32/mach-fs/pinmux.c new file mode 100644 index 000000000..05a04708b --- /dev/null +++ b/kernel/arch/cris/arch-v32/mach-fs/pinmux.c @@ -0,0 +1,323 @@ +/* + * Allocator for I/O pins. All pins are allocated to GPIO at bootup. + * Unassigned pins and GPIO pins can be allocated to a fixed interface + * or the I/O processor instead. + * + * Copyright (c) 2004-2007 Axis Communications AB. + */ + +#include <linux/init.h> +#include <linux/errno.h> +#include <linux/kernel.h> +#include <linux/string.h> +#include <linux/spinlock.h> +#include <hwregs/reg_map.h> +#include <hwregs/reg_rdwr.h> +#include <pinmux.h> +#include <hwregs/pinmux_defs.h> + +#undef DEBUG + +#define PORT_PINS 18 +#define PORTS 4 + +static char pins[PORTS][PORT_PINS]; +static DEFINE_SPINLOCK(pinmux_lock); + +static void crisv32_pinmux_set(int port); + +static int __crisv32_pinmux_alloc(int port, int first_pin, int last_pin, + enum pin_mode mode) +{ + int i; + + for (i = first_pin; i <= last_pin; i++) { + if ((pins[port][i] != pinmux_none) + && (pins[port][i] != pinmux_gpio) + && (pins[port][i] != mode)) { +#ifdef DEBUG + panic("Pinmux alloc failed!\n"); +#endif + return -EPERM; + } + } + + for (i = first_pin; i <= last_pin; i++) + pins[port][i] = mode; + + crisv32_pinmux_set(port); +} + +static int crisv32_pinmux_init(void) +{ + static int initialized; + + if (!initialized) { + reg_pinmux_rw_pa pa = REG_RD(pinmux, regi_pinmux, rw_pa); + initialized = 1; + REG_WR_INT(pinmux, regi_pinmux, rw_hwprot, 0); + pa.pa0 = pa.pa1 = pa.pa2 = pa.pa3 = + pa.pa4 = pa.pa5 = pa.pa6 = pa.pa7 = regk_pinmux_yes; + REG_WR(pinmux, regi_pinmux, rw_pa, pa); + __crisv32_pinmux_alloc(PORT_B, 0, PORT_PINS - 1, pinmux_gpio); + __crisv32_pinmux_alloc(PORT_C, 0, PORT_PINS - 1, pinmux_gpio); + __crisv32_pinmux_alloc(PORT_D, 0, PORT_PINS - 1, pinmux_gpio); + __crisv32_pinmux_alloc(PORT_E, 0, PORT_PINS - 1, pinmux_gpio); + } + + return 0; +} + +int crisv32_pinmux_alloc(int port, int first_pin, int last_pin, + enum pin_mode mode) +{ + unsigned long flags; + int ret; + + crisv32_pinmux_init(); + + if (port > PORTS || port < 0) + return -EINVAL; + + spin_lock_irqsave(&pinmux_lock, flags); + + ret = __crisv32_pinmux_alloc(port, first_pin, last_pin, mode); + + spin_unlock_irqrestore(&pinmux_lock, flags); + + return ret; +} + +int crisv32_pinmux_alloc_fixed(enum fixed_function function) +{ + int ret = -EINVAL; + char saved[sizeof pins]; + unsigned long flags; + + spin_lock_irqsave(&pinmux_lock, flags); + + /* Save internal data for recovery */ + memcpy(saved, pins, sizeof pins); + + crisv32_pinmux_init(); /* Must be done before we read rw_hwprot */ + + reg_pinmux_rw_hwprot hwprot = REG_RD(pinmux, regi_pinmux, rw_hwprot); + + switch (function) { + case pinmux_ser1: + ret = __crisv32_pinmux_alloc(PORT_C, 4, 7, pinmux_fixed); + hwprot.ser1 = regk_pinmux_yes; + break; + case pinmux_ser2: + ret = __crisv32_pinmux_alloc(PORT_C, 8, 11, pinmux_fixed); + hwprot.ser2 = regk_pinmux_yes; + break; + case pinmux_ser3: + ret = __crisv32_pinmux_alloc(PORT_C, 12, 15, pinmux_fixed); + hwprot.ser3 = regk_pinmux_yes; + break; + case pinmux_sser0: + ret = __crisv32_pinmux_alloc(PORT_C, 0, 3, pinmux_fixed); + ret |= __crisv32_pinmux_alloc(PORT_C, 16, 16, pinmux_fixed); + hwprot.sser0 = regk_pinmux_yes; + break; + case pinmux_sser1: + ret = __crisv32_pinmux_alloc(PORT_D, 0, 4, pinmux_fixed); + hwprot.sser1 = regk_pinmux_yes; + break; + case pinmux_ata0: + ret = __crisv32_pinmux_alloc(PORT_D, 5, 7, pinmux_fixed); + ret |= __crisv32_pinmux_alloc(PORT_D, 15, 17, pinmux_fixed); + hwprot.ata0 = regk_pinmux_yes; + break; + case pinmux_ata1: + ret = __crisv32_pinmux_alloc(PORT_D, 0, 4, pinmux_fixed); + ret |= __crisv32_pinmux_alloc(PORT_E, 17, 17, pinmux_fixed); + hwprot.ata1 = regk_pinmux_yes; + break; + case pinmux_ata2: + ret = __crisv32_pinmux_alloc(PORT_C, 11, 15, pinmux_fixed); + ret |= __crisv32_pinmux_alloc(PORT_E, 3, 3, pinmux_fixed); + hwprot.ata2 = regk_pinmux_yes; + break; + case pinmux_ata3: + ret = __crisv32_pinmux_alloc(PORT_C, 8, 10, pinmux_fixed); + ret |= __crisv32_pinmux_alloc(PORT_C, 0, 2, pinmux_fixed); + hwprot.ata2 = regk_pinmux_yes; + break; + case pinmux_ata: + ret = __crisv32_pinmux_alloc(PORT_B, 0, 15, pinmux_fixed); + ret |= __crisv32_pinmux_alloc(PORT_D, 8, 15, pinmux_fixed); + hwprot.ata = regk_pinmux_yes; + break; + case pinmux_eth1: + ret = __crisv32_pinmux_alloc(PORT_E, 0, 17, pinmux_fixed); + hwprot.eth1 = regk_pinmux_yes; + hwprot.eth1_mgm = regk_pinmux_yes; + break; + case pinmux_timer: + ret = __crisv32_pinmux_alloc(PORT_C, 16, 16, pinmux_fixed); + hwprot.timer = regk_pinmux_yes; + spin_unlock_irqrestore(&pinmux_lock, flags); + return ret; + } + + if (!ret) + REG_WR(pinmux, regi_pinmux, rw_hwprot, hwprot); + else + memcpy(pins, saved, sizeof pins); + + spin_unlock_irqrestore(&pinmux_lock, flags); + + return ret; +} + +void crisv32_pinmux_set(int port) +{ + int i; + int gpio_val = 0; + int iop_val = 0; + + for (i = 0; i < PORT_PINS; i++) { + if (pins[port][i] == pinmux_gpio) + gpio_val |= (1 << i); + else if (pins[port][i] == pinmux_iop) + iop_val |= (1 << i); + } + + REG_WRITE(int, regi_pinmux + REG_RD_ADDR_pinmux_rw_pb_gio + 8 * port, + gpio_val); + REG_WRITE(int, regi_pinmux + REG_RD_ADDR_pinmux_rw_pb_iop + 8 * port, + iop_val); + +#ifdef DEBUG + crisv32_pinmux_dump(); +#endif +} + +static int __crisv32_pinmux_dealloc(int port, int first_pin, int last_pin) +{ + int i; + + for (i = first_pin; i <= last_pin; i++) + pins[port][i] = pinmux_none; + + crisv32_pinmux_set(port); + return 0; +} + +int crisv32_pinmux_dealloc(int port, int first_pin, int last_pin) +{ + unsigned long flags; + + crisv32_pinmux_init(); + + if (port > PORTS || port < 0) + return -EINVAL; + + spin_lock_irqsave(&pinmux_lock, flags); + __crisv32_pinmux_dealloc(port, first_pin, last_pin); + spin_unlock_irqrestore(&pinmux_lock, flags); + + return 0; +} + +int crisv32_pinmux_dealloc_fixed(enum fixed_function function) +{ + int ret = -EINVAL; + char saved[sizeof pins]; + unsigned long flags; + + spin_lock_irqsave(&pinmux_lock, flags); + + /* Save internal data for recovery */ + memcpy(saved, pins, sizeof pins); + + crisv32_pinmux_init(); /* Must be done before we read rw_hwprot */ + + reg_pinmux_rw_hwprot hwprot = REG_RD(pinmux, regi_pinmux, rw_hwprot); + + switch (function) { + case pinmux_ser1: + ret = __crisv32_pinmux_dealloc(PORT_C, 4, 7); + hwprot.ser1 = regk_pinmux_no; + break; + case pinmux_ser2: + ret = __crisv32_pinmux_dealloc(PORT_C, 8, 11); + hwprot.ser2 = regk_pinmux_no; + break; + case pinmux_ser3: + ret = __crisv32_pinmux_dealloc(PORT_C, 12, 15); + hwprot.ser3 = regk_pinmux_no; + break; + case pinmux_sser0: + ret = __crisv32_pinmux_dealloc(PORT_C, 0, 3); + ret |= __crisv32_pinmux_dealloc(PORT_C, 16, 16); + hwprot.sser0 = regk_pinmux_no; + break; + case pinmux_sser1: + ret = __crisv32_pinmux_dealloc(PORT_D, 0, 4); + hwprot.sser1 = regk_pinmux_no; + break; + case pinmux_ata0: + ret = __crisv32_pinmux_dealloc(PORT_D, 5, 7); + ret |= __crisv32_pinmux_dealloc(PORT_D, 15, 17); + hwprot.ata0 = regk_pinmux_no; + break; + case pinmux_ata1: + ret = __crisv32_pinmux_dealloc(PORT_D, 0, 4); + ret |= __crisv32_pinmux_dealloc(PORT_E, 17, 17); + hwprot.ata1 = regk_pinmux_no; + break; + case pinmux_ata2: + ret = __crisv32_pinmux_dealloc(PORT_C, 11, 15); + ret |= __crisv32_pinmux_dealloc(PORT_E, 3, 3); + hwprot.ata2 = regk_pinmux_no; + break; + case pinmux_ata3: + ret = __crisv32_pinmux_dealloc(PORT_C, 8, 10); + ret |= __crisv32_pinmux_dealloc(PORT_C, 0, 2); + hwprot.ata2 = regk_pinmux_no; + break; + case pinmux_ata: + ret = __crisv32_pinmux_dealloc(PORT_B, 0, 15); + ret |= __crisv32_pinmux_dealloc(PORT_D, 8, 15); + hwprot.ata = regk_pinmux_no; + break; + case pinmux_eth1: + ret = __crisv32_pinmux_dealloc(PORT_E, 0, 17); + hwprot.eth1 = regk_pinmux_no; + hwprot.eth1_mgm = regk_pinmux_no; + break; + case pinmux_timer: + ret = __crisv32_pinmux_dealloc(PORT_C, 16, 16); + hwprot.timer = regk_pinmux_no; + spin_unlock_irqrestore(&pinmux_lock, flags); + return ret; + } + + if (!ret) + REG_WR(pinmux, regi_pinmux, rw_hwprot, hwprot); + else + memcpy(pins, saved, sizeof pins); + + spin_unlock_irqrestore(&pinmux_lock, flags); + + return ret; +} + +#ifdef DEBUG +static void crisv32_pinmux_dump(void) +{ + int i, j; + + crisv32_pinmux_init(); + + for (i = 0; i < PORTS; i++) { + printk(KERN_DEBUG "Port %c\n", 'B' + i); + for (j = 0; j < PORT_PINS; j++) + printk(KERN_DEBUG " Pin %d = %d\n", j, pins[i][j]); + } +} +#endif +__initcall(crisv32_pinmux_init); |