diff options
Diffstat (limited to 'arch/cris/arch-v32/drivers/mach-a3/gpio.c')
| -rw-r--r-- | arch/cris/arch-v32/drivers/mach-a3/gpio.c | 984 |
1 files changed, 984 insertions, 0 deletions
diff --git a/arch/cris/arch-v32/drivers/mach-a3/gpio.c b/arch/cris/arch-v32/drivers/mach-a3/gpio.c new file mode 100644 index 000000000000..de107dad9f4f --- /dev/null +++ b/arch/cris/arch-v32/drivers/mach-a3/gpio.c @@ -0,0 +1,984 @@ +/* + * Artec-3 general port I/O device + * + * Copyright (c) 2007 Axis Communications AB + * + * Authors: Bjorn Wesen (initial version) + * Ola Knutsson (LED handling) + * Johan Adolfsson (read/set directions, write, port G, + * port to ETRAX FS. + * Ricard Wanderlof (PWM for Artpec-3) + * + */ + +#include <linux/module.h> +#include <linux/sched.h> +#include <linux/slab.h> +#include <linux/ioport.h> +#include <linux/errno.h> +#include <linux/kernel.h> +#include <linux/fs.h> +#include <linux/string.h> +#include <linux/poll.h> +#include <linux/init.h> +#include <linux/interrupt.h> +#include <linux/spinlock.h> + +#include <asm/etraxgpio.h> +#include <hwregs/reg_map.h> +#include <hwregs/reg_rdwr.h> +#include <hwregs/gio_defs.h> +#include <hwregs/intr_vect_defs.h> +#include <asm/io.h> +#include <asm/system.h> +#include <asm/irq.h> +#include <asm/arch/mach/pinmux.h> + +#ifdef CONFIG_ETRAX_VIRTUAL_GPIO +#include "../i2c.h" + +#define VIRT_I2C_ADDR 0x40 +#endif + +/* The following gio ports on ARTPEC-3 is available: + * pa 32 bits + * pb 32 bits + * pc 16 bits + * each port has a rw_px_dout, r_px_din and rw_px_oe register. + */ + +#define GPIO_MAJOR 120 /* experimental MAJOR number */ + +#define I2C_INTERRUPT_BITS 0x300 /* i2c0_done and i2c1_done bits */ + +#define D(x) + +#if 0 +static int dp_cnt; +#define DP(x) \ + do { \ + dp_cnt++; \ + if (dp_cnt % 1000 == 0) \ + x; \ + } while (0) +#else +#define DP(x) +#endif + +static char gpio_name[] = "etrax gpio"; + +#ifdef CONFIG_ETRAX_VIRTUAL_GPIO +static int virtual_gpio_ioctl(struct file *file, unsigned int cmd, + unsigned long arg); +#endif +static int gpio_ioctl(struct inode *inode, struct file *file, + unsigned int cmd, unsigned long arg); +static ssize_t gpio_write(struct file *file, const char __user *buf, + size_t count, loff_t *off); +static int gpio_open(struct inode *inode, struct file *filp); +static int gpio_release(struct inode *inode, struct file *filp); +static unsigned int gpio_poll(struct file *filp, + struct poll_table_struct *wait); + +/* private data per open() of this driver */ + +struct gpio_private { + struct gpio_private *next; + /* The IO_CFG_WRITE_MODE_VALUE only support 8 bits: */ + unsigned char clk_mask; + unsigned char data_mask; + unsigned char write_msb; + unsigned char pad1; + /* These fields are generic */ + unsigned long highalarm, lowalarm; + wait_queue_head_t alarm_wq; + int minor; +}; + +static void gpio_set_alarm(struct gpio_private *priv); +static int gpio_leds_ioctl(unsigned int cmd, unsigned long arg); +static int gpio_pwm_ioctl(struct gpio_private *priv, unsigned int cmd, + unsigned long arg); + + +/* linked list of alarms to check for */ + +static struct gpio_private *alarmlist; + +static int wanted_interrupts; + +static DEFINE_SPINLOCK(gpio_lock); + +#define NUM_PORTS (GPIO_MINOR_LAST+1) +#define GIO_REG_RD_ADDR(reg) \ + (unsigned long *)(regi_gio + REG_RD_ADDR_gio_##reg) +#define GIO_REG_WR_ADDR(reg) \ + (unsigned long *)(regi_gio + REG_WR_ADDR_gio_##reg) +static unsigned long led_dummy; +static unsigned long port_d_dummy; /* Only input on Artpec-3 */ +#ifdef CONFIG_ETRAX_VIRTUAL_GPIO +static unsigned long port_e_dummy; /* Non existent on Artpec-3 */ +static unsigned long virtual_dummy; +static unsigned long virtual_rw_pv_oe = CONFIG_ETRAX_DEF_GIO_PV_OE; +static unsigned short cached_virtual_gpio_read; +#endif + +static unsigned long *data_out[NUM_PORTS] = { + GIO_REG_WR_ADDR(rw_pa_dout), + GIO_REG_WR_ADDR(rw_pb_dout), + &led_dummy, + GIO_REG_WR_ADDR(rw_pc_dout), + &port_d_dummy, +#ifdef CONFIG_ETRAX_VIRTUAL_GPIO + &port_e_dummy, + &virtual_dummy, +#endif +}; + +static unsigned long *data_in[NUM_PORTS] = { + GIO_REG_RD_ADDR(r_pa_din), + GIO_REG_RD_ADDR(r_pb_din), + &led_dummy, + GIO_REG_RD_ADDR(r_pc_din), + GIO_REG_RD_ADDR(r_pd_din), +#ifdef CONFIG_ETRAX_VIRTUAL_GPIO + &port_e_dummy, + &virtual_dummy, +#endif +}; + +static unsigned long changeable_dir[NUM_PORTS] = { + CONFIG_ETRAX_PA_CHANGEABLE_DIR, + CONFIG_ETRAX_PB_CHANGEABLE_DIR, + 0, + CONFIG_ETRAX_PC_CHANGEABLE_DIR, + 0, +#ifdef CONFIG_ETRAX_VIRTUAL_GPIO + 0, + CONFIG_ETRAX_PV_CHANGEABLE_DIR, +#endif +}; + +static unsigned long changeable_bits[NUM_PORTS] = { + CONFIG_ETRAX_PA_CHANGEABLE_BITS, + CONFIG_ETRAX_PB_CHANGEABLE_BITS, + 0, + CONFIG_ETRAX_PC_CHANGEABLE_BITS, + 0, +#ifdef CONFIG_ETRAX_VIRTUAL_GPIO + 0, + CONFIG_ETRAX_PV_CHANGEABLE_BITS, +#endif +}; + +static unsigned long *dir_oe[NUM_PORTS] = { + GIO_REG_WR_ADDR(rw_pa_oe), + GIO_REG_WR_ADDR(rw_pb_oe), + &led_dummy, + GIO_REG_WR_ADDR(rw_pc_oe), + &port_d_dummy, +#ifdef CONFIG_ETRAX_VIRTUAL_GPIO + &port_e_dummy, + &virtual_rw_pv_oe, +#endif +}; + +static void gpio_set_alarm(struct gpio_private *priv) +{ + int bit; + int intr_cfg; + int mask; + int pins; + unsigned long flags; + + spin_lock_irqsave(&gpio_lock, flags); + intr_cfg = REG_RD_INT(gio, regi_gio, rw_intr_cfg); + pins = REG_RD_INT(gio, regi_gio, rw_intr_pins); + mask = REG_RD_INT(gio, regi_gio, rw_intr_mask) & I2C_INTERRUPT_BITS; + + for (bit = 0; bit < 32; bit++) { + int intr = bit % 8; + int pin = bit / 8; + if (priv->minor < GPIO_MINOR_LEDS) + pin += priv->minor * 4; + else + pin += (priv->minor - 1) * 4; + + if (priv->highalarm & (1<<bit)) { + intr_cfg |= (regk_gio_hi << (intr * 3)); + mask |= 1 << intr; + wanted_interrupts = mask & 0xff; + pins |= pin << (intr * 4); + } else if (priv->lowalarm & (1<<bit)) { + intr_cfg |= (regk_gio_lo << (intr * 3)); + mask |= 1 << intr; + wanted_interrupts = mask & 0xff; + pins |= pin << (intr * 4); + } + } + + REG_WR_INT(gio, regi_gio, rw_intr_cfg, intr_cfg); + REG_WR_INT(gio, regi_gio, rw_intr_pins, pins); + REG_WR_INT(gio, regi_gio, rw_intr_mask, mask); + + spin_unlock_irqrestore(&gpio_lock, flags); +} + +static unsigned int gpio_poll(struct file *file, struct poll_table_struct *wait) +{ + unsigned int mask = 0; + struct gpio_private *priv = file->private_data; + unsigned long data; + unsigned long tmp; + + if (priv->minor >= GPIO_MINOR_PWM0 && + priv->minor <= GPIO_MINOR_LAST_PWM) + return 0; + + poll_wait(file, &priv->alarm_wq, wait); + if (priv->minor <= GPIO_MINOR_D) { + data = readl(data_in[priv->minor]); + REG_WR_INT(gio, regi_gio, rw_ack_intr, wanted_interrupts); + tmp = REG_RD_INT(gio, regi_gio, rw_intr_mask); + tmp &= I2C_INTERRUPT_BITS; + tmp |= wanted_interrupts; + REG_WR_INT(gio, regi_gio, rw_intr_mask, tmp); + } else + return 0; + + if ((data & priv->highalarm) || (~data & priv->lowalarm)) + mask = POLLIN|POLLRDNORM; + + DP(printk(KERN_DEBUG "gpio_poll ready: mask 0x%08X\n", mask)); + return mask; +} + +static irqreturn_t gpio_interrupt(int irq, void *dev_id) +{ + reg_gio_rw_intr_mask intr_mask; + reg_gio_r_masked_intr masked_intr; + reg_gio_rw_ack_intr ack_intr; + unsigned long flags; + unsigned long tmp; + unsigned long tmp2; +#ifdef CONFIG_ETRAX_VIRTUAL_GPIO + unsigned char enable_gpiov_ack = 0; +#endif + + /* Find what PA interrupts are active */ + masked_intr = REG_RD(gio, regi_gio, r_masked_intr); + tmp = REG_TYPE_CONV(unsigned long, reg_gio_r_masked_intr, masked_intr); + + /* Find those that we have enabled */ + spin_lock_irqsave(&gpio_lock, flags); + tmp &= wanted_interrupts; + spin_unlock_irqrestore(&gpio_lock, flags); + +#ifdef CONFIG_ETRAX_VIRTUAL_GPIO + /* Something changed on virtual GPIO. Interrupt is acked by + * reading the device. + */ + if (tmp & (1 << CONFIG_ETRAX_VIRTUAL_GPIO_INTERRUPT_PA_PIN)) { + i2c_read(VIRT_I2C_ADDR, (void *)&cached_virtual_gpio_read, + sizeof(cached_virtual_gpio_read)); + enable_gpiov_ack = 1; + } +#endif + + /* Ack them */ + ack_intr = REG_TYPE_CONV(reg_gio_rw_ack_intr, unsigned long, tmp); + REG_WR(gio, regi_gio, rw_ack_intr, ack_intr); + + /* Disable those interrupts.. */ + intr_mask = REG_RD(gio, regi_gio, rw_intr_mask); + tmp2 = REG_TYPE_CONV(unsigned long, reg_gio_rw_intr_mask, intr_mask); + tmp2 &= ~tmp; +#ifdef CONFIG_ETRAX_VIRTUAL_GPIO + /* Do not disable interrupt on virtual GPIO. Changes on virtual + * pins are only noticed by an interrupt. + */ + if (enable_gpiov_ack) + tmp2 |= (1 << CONFIG_ETRAX_VIRTUAL_GPIO_INTERRUPT_PA_PIN); +#endif + intr_mask = REG_TYPE_CONV(reg_gio_rw_intr_mask, unsigned long, tmp2); + REG_WR(gio, regi_gio, rw_intr_mask, intr_mask); + + return IRQ_RETVAL(tmp); +} + +static void gpio_write_bit(unsigned long *port, unsigned char data, int bit, + unsigned char clk_mask, unsigned char data_mask) +{ + unsigned long shadow = readl(port) & ~clk_mask; + writel(shadow, port); + if (data & 1 << bit) + shadow |= data_mask; + else + shadow &= ~data_mask; + writel(shadow, port); + /* For FPGA: min 5.0ns (DCC) before CCLK high */ + shadow |= clk_mask; + writel(shadow, port); +} + +static void gpio_write_byte(struct gpio_private *priv, unsigned long *port, + unsigned char data) +{ + int i; + + if (priv->write_msb) + for (i = 7; i >= 0; i--) + gpio_write_bit(port, data, i, priv->clk_mask, + priv->data_mask); + else + for (i = 0; i <= 7; i++) + gpio_write_bit(port, data, i, priv->clk_mask, + priv->data_mask); +} + + +static ssize_t gpio_write(struct file *file, const char __user *buf, + size_t count, loff_t *off) +{ + struct gpio_private *priv = file->private_data; + unsigned long flags; + ssize_t retval = count; + /* Only bits 0-7 may be used for write operations but allow all + devices except leds... */ +#ifdef CONFIG_ETRAX_VIRTUAL_GPIO + if (priv->minor == GPIO_MINOR_V) + return -EFAULT; +#endif + if (priv->minor == GPIO_MINOR_LEDS) + return -EFAULT; + + if (priv->minor >= GPIO_MINOR_PWM0 && + priv->minor <= GPIO_MINOR_LAST_PWM) + return -EFAULT; + + if (!access_ok(VERIFY_READ, buf, count)) + return -EFAULT; + + /* It must have been configured using the IO_CFG_WRITE_MODE */ + /* Perhaps a better error code? */ + if (priv->clk_mask == 0 || priv->data_mask == 0) + return -EPERM; + + D(printk(KERN_DEBUG "gpio_write: %lu to data 0x%02X clk 0x%02X " + "msb: %i\n", + count, priv->data_mask, priv->clk_mask, priv->write_msb)); + + spin_lock_irqsave(&gpio_lock, flags); + + while (count--) + gpio_write_byte(priv, data_out[priv->minor], *buf++); + + spin_unlock_irqrestore(&gpio_lock, flags); + return retval; +} + +static int gpio_open(struct inode *inode, struct file *filp) +{ + struct gpio_private *priv; + int p = iminor(inode); + + if (p > GPIO_MINOR_LAST_PWM || + (p > GPIO_MINOR_LAST && p < GPIO_MINOR_PWM0)) + return -EINVAL; + + priv = kmalloc(sizeof(struct gpio_private), GFP_KERNEL); + + if (!priv) + return -ENOMEM; + memset(priv, 0, sizeof(*priv)); + + priv->minor = p; + filp->private_data = priv; + + /* initialize the io/alarm struct, not for PWM ports though */ + if (p <= GPIO_MINOR_LAST) { + + priv->clk_mask = 0; + priv->data_mask = 0; + priv->highalarm = 0; + priv->lowalarm = 0; + + init_waitqueue_head(&priv->alarm_wq); + + /* link it into our alarmlist */ + spin_lock_irq(&gpio_lock); + priv->next = alarmlist; + alarmlist = priv; + spin_unlock_irq(&gpio_lock); + } + + return 0; +} + +static int gpio_release(struct inode *inode, struct file *filp) +{ + struct gpio_private *p; + struct gpio_private *todel; + /* local copies while updating them: */ + unsigned long a_high, a_low; + + /* prepare to free private structure */ + todel = filp->private_data; + + /* unlink from alarmlist - only for non-PWM ports though */ + if (todel->minor <= GPIO_MINOR_LAST) { + spin_lock_irq(&gpio_lock); + p = alarmlist; + + if (p == todel) + alarmlist = todel->next; + else { + while (p->next != todel) + p = p->next; + p->next = todel->next; + } + + /* Check if there are still any alarms set */ + p = alarmlist; + a_high = 0; + a_low = 0; + while (p) { + if (p->minor == GPIO_MINOR_A) { +#ifdef CONFIG_ETRAX_VIRTUAL_GPIO + p->lowalarm |= (1 << CONFIG_ETRAX_VIRTUAL_GPIO_INTERRUPT_PA_PIN); +#endif + a_high |= p->highalarm; + a_low |= p->lowalarm; + } + + p = p->next; + } + +#ifdef CONFIG_ETRAX_VIRTUAL_GPIO + /* Variable 'a_low' needs to be set here again + * to ensure that interrupt for virtual GPIO is handled. + */ + a_low |= (1 << CONFIG_ETRAX_VIRTUAL_GPIO_INTERRUPT_PA_PIN); +#endif + + spin_unlock_irq(&gpio_lock); + } + kfree(todel); + + return 0; +} + +/* Main device API. ioctl's to read/set/clear bits, as well as to + * set alarms to wait for using a subsequent select(). + */ + +inline unsigned long setget_input(struct gpio_private *priv, unsigned long arg) +{ + /* Set direction 0=unchanged 1=input, + * return mask with 1=input + */ + unsigned long flags; + unsigned long dir_shadow; + + spin_lock_irqsave(&gpio_lock, flags); + + dir_shadow = readl(dir_oe[priv->minor]) & + ~(arg & changeable_dir[priv->minor]); + writel(dir_shadow, dir_oe[priv->minor]); + + spin_unlock_irqrestore(&gpio_lock, flags); + + if (priv->minor == GPIO_MINOR_C) + dir_shadow ^= 0xFFFF; /* Only 16 bits */ +#ifdef CONFIG_ETRAX_VIRTUAL_GPIO + else if (priv->minor == GPIO_MINOR_V) + dir_shadow ^= 0xFFFF; /* Only 16 bits */ +#endif + else + dir_shadow ^= 0xFFFFFFFF; /* PA, PB and PD 32 bits */ + + return dir_shadow; + +} /* setget_input */ + +static inline unsigned long setget_output(struct gpio_private *priv, + unsigned long arg) +{ + unsigned long flags; + unsigned long dir_shadow; + + spin_lock_irqsave(&gpio_lock, flags); + + dir_shadow = readl(dir_oe[priv->minor]) | + (arg & changeable_dir[priv->minor]); + writel(dir_shadow, dir_oe[priv->minor]); + + spin_unlock_irqrestore(&gpio_lock, flags); + return dir_shadow; +} /* setget_output */ + +static int gpio_ioctl(struct inode *inode, struct file *file, + unsigned int cmd, unsigned long arg) +{ + unsigned long flags; + unsigned long val; + unsigned long shadow; + struct gpio_private *priv = file->private_data; + + if (_IOC_TYPE(cmd) != ETRAXGPIO_IOCTYPE) + return -ENOTTY; + + /* Check for special ioctl handlers first */ + +#ifdef CONFIG_ETRAX_VIRTUAL_GPIO + if (priv->minor == GPIO_MINOR_V) + return virtual_gpio_ioctl(file, cmd, arg); +#endif + + if (priv->minor == GPIO_MINOR_LEDS) + return gpio_leds_ioctl(cmd, arg); + + if (priv->minor >= GPIO_MINOR_PWM0 && + priv->minor <= GPIO_MINOR_LAST_PWM) + return gpio_pwm_ioctl(priv, cmd, arg); + + switch (_IOC_NR(cmd)) { + case IO_READBITS: /* Use IO_READ_INBITS and IO_READ_OUTBITS instead */ + /* Read the port. */ + return readl(data_in[priv->minor]); + case IO_SETBITS: + spin_lock_irqsave(&gpio_lock, flags); + /* Set changeable bits with a 1 in arg. */ + shadow = readl(data_out[priv->minor]) | + (arg & changeable_bits[priv->minor]); + writel(shadow, data_out[priv->minor]); + spin_unlock_irqrestore(&gpio_lock, flags); + break; + case IO_CLRBITS: + spin_lock_irqsave(&gpio_lock, flags); + /* Clear changeable bits with a 1 in arg. */ + shadow = readl(data_out[priv->minor]) & + ~(arg & changeable_bits[priv->minor]); + writel(shadow, data_out[priv->minor]); + spin_unlock_irqrestore(&gpio_lock, flags); + break; + case IO_HIGHALARM: + /* Set alarm when bits with 1 in arg go high. */ + priv->highalarm |= arg; + gpio_set_alarm(priv); + break; + case IO_LOWALARM: + /* Set alarm when bits with 1 in arg go low. */ + priv->lowalarm |= arg; + gpio_set_alarm(priv); + break; + case IO_CLRALARM: + /* Clear alarm for bits with 1 in arg. */ + priv->highalarm &= ~arg; + priv->lowalarm &= ~arg; + gpio_set_alarm(priv); + break; + case IO_READDIR: /* Use IO_SETGET_INPUT/OUTPUT instead! */ + /* Read direction 0=input 1=output */ + return readl(dir_oe[priv->minor]); + + case IO_SETINPUT: /* Use IO_SETGET_INPUT instead! */ + /* Set direction 0=unchanged 1=input, + * return mask with 1=input + */ + return setget_input(priv, arg); + + case IO_SETOUTPUT: /* Use IO_SETGET_OUTPUT instead! */ + /* Set direction 0=unchanged 1=output, + * return mask with 1=output + */ + return setget_output(priv, arg); + + case IO_CFG_WRITE_MODE: + { + int res = -EPERM; + unsigned long dir_shadow, clk_mask, data_mask, write_msb; + + clk_mask = arg & 0xFF; + data_mask = (arg >> 8) & 0xFF; + write_msb = (arg >> 16) & 0x01; + + /* Check if we're allowed to change the bits and + * the direction is correct + */ + spin_lock_irqsave(&gpio_lock, flags); + dir_shadow = readl(dir_oe[priv->minor]); + if ((clk_mask & changeable_bits[priv->minor]) && + (data_mask & changeable_bits[priv->minor]) && + (clk_mask & dir_shadow) && + (data_mask & dir_shadow)) { + priv->clk_mask = clk_mask; + priv->data_mask = data_mask; + priv->write_msb = write_msb; + res = 0; + } + spin_unlock_irqrestore(&gpio_lock, flags); + + return res; + } + case IO_READ_INBITS: + /* *arg is result of reading the input pins */ + val = readl(data_in[priv->minor]); + if (copy_to_user((void __user *)arg, &val, sizeof(val))) + return -EFAULT; + return 0; + case IO_READ_OUTBITS: + /* *arg is result of reading the output shadow */ + val = *data_out[priv->minor]; + if (copy_to_user((void __user *)arg, &val, sizeof(val))) + return -EFAULT; + break; + case IO_SETGET_INPUT: + /* bits set in *arg is set to input, + * *arg updated with current input pins. + */ + if (copy_from_user(&val, (void __user *)arg, sizeof(val))) + return -EFAULT; + val = setget_input(priv, val); + if (copy_to_user((void __user *)arg, &val, sizeof(val))) + return -EFAULT; + break; + case IO_SETGET_OUTPUT: + /* bits set in *arg is set to output, + * *arg updated with current output pins. + */ + if (copy_from_user(&val, (void __user *)arg, sizeof(val))) + return -EFAULT; + val = setget_output(priv, val); + if (copy_to_user((void __user *)arg, &val, sizeof(val))) + return -EFAULT; + break; + default: + return -EINVAL; + } /* switch */ + + return 0; +} + +#ifdef CONFIG_ETRAX_VIRTUAL_GPIO +static int virtual_gpio_ioctl(struct file *file, unsigned int cmd, + unsigned long arg) +{ + unsigned long flags; + unsigned short val; + unsigned short shadow; + struct gpio_private *priv = file->private_data; + + switch (_IOC_NR(cmd)) { + case IO_SETBITS: + spin_lock_irqsave(&gpio_lock, flags); + /* Set changeable bits with a 1 in arg. */ + i2c_read(VIRT_I2C_ADDR, (void *)&shadow, sizeof(shadow)); + shadow |= ~readl(dir_oe[priv->minor]) | + (arg & changeable_bits[priv->minor]); + i2c_write(VIRT_I2C_ADDR, (void *)&shadow, sizeof(shadow)); + spin_lock_irqrestore(&gpio_lock, flags); + break; + case IO_CLRBITS: + spin_lock_irqsave(&gpio_lock, flags); + /* Clear changeable bits with a 1 in arg. */ + i2c_read(VIRT_I2C_ADDR, (void *)&shadow, sizeof(shadow)); + shadow |= ~readl(dir_oe[priv->minor]) & + ~(arg & changeable_bits[priv->minor]); + i2c_write(VIRT_I2C_ADDR, (void *)&shadow, sizeof(shadow)); + spin_lock_irqrestore(&gpio_lock, flags); + break; + case IO_HIGHALARM: + /* Set alarm when bits with 1 in arg go high. */ + priv->highalarm |= arg; + break; + case IO_LOWALARM: + /* Set alarm when bits with 1 in arg go low. */ + priv->lowalarm |= arg; + break; + case IO_CLRALARM: + /* Clear alarm for bits with 1 in arg. */ + priv->highalarm &= ~arg; + priv->lowalarm &= ~arg; + break; + case IO_CFG_WRITE_MODE: + { + unsigned long dir_shadow; + dir_shadow = readl(dir_oe[priv->minor]); + + priv->clk_mask = arg & 0xFF; + priv->data_mask = (arg >> 8) & 0xFF; + priv->write_msb = (arg >> 16) & 0x01; + /* Check if we're allowed to change the bits and + * the direction is correct + */ + if (!((priv->clk_mask & changeable_bits[priv->minor]) && + (priv->data_mask & changeable_bits[priv->minor]) && + (priv->clk_mask & dir_shadow) && + (priv->data_mask & dir_shadow))) { + priv->clk_mask = 0; + priv->data_mask = 0; + return -EPERM; + } + break; + } + case IO_READ_INBITS: + /* *arg is result of reading the input pins */ + val = cached_virtual_gpio_read & ~readl(dir_oe[priv->minor]); + if (copy_to_user((void __user *)arg, &val, sizeof(val))) + return -EFAULT; + return 0; + + case IO_READ_OUTBITS: + /* *arg is result of reading the output shadow */ + i2c_read(VIRT_I2C_ADDR, (void *)&val, sizeof(val)); + val &= readl(dir_oe[priv->minor]); + if (copy_to_user((void __user *)arg, &val, sizeof(val))) + return -EFAULT; + break; + case IO_SETGET_INPUT: + { + /* bits set in *arg is set to input, + * *arg updated with current input pins. + */ + unsigned short input_mask = ~readl(dir_oe[priv->minor]); + if (copy_from_user(&val, (void __user *)arg, sizeof(val))) + return -EFAULT; + val = setget_input(priv, val); + if (copy_to_user((void __user *)arg, &val, sizeof(val))) + return -EFAULT; + if ((input_mask & val) != input_mask) { + /* Input pins changed. All ports desired as input + * should be set to logic 1. + */ + unsigned short change = input_mask ^ val; + i2c_read(VIRT_I2C_ADDR, (void *)&shadow, + sizeof(shadow)); + shadow &= ~change; + shadow |= val; + i2c_write(VIRT_I2C_ADDR, (void *)&shadow, + sizeof(shadow)); + } + break; + } + case IO_SETGET_OUTPUT: + /* bits set in *arg is set to output, + * *arg updated with current output pins. + */ + if (copy_from_user(&val, (void __user *)arg, sizeof(val))) + return -EFAULT; + val = setget_output(priv, val); + if (copy_to_user((void __user *)arg, &val, sizeof(val))) + return -EFAULT; + break; + default: + return -EINVAL; + } /* switch */ + return 0; +} +#endif /* CONFIG_ETRAX_VIRTUAL_GPIO */ + +static int gpio_leds_ioctl(unsigned int cmd, unsigned long arg) +{ + unsigned char green; + unsigned char red; + + switch (_IOC_NR(cmd)) { + case IO_LEDACTIVE_SET: + green = ((unsigned char) arg) & 1; + red = (((unsigned char) arg) >> 1) & 1; + CRIS_LED_ACTIVE_SET_G(green); + CRIS_LED_ACTIVE_SET_R(red); + break; + + default: + return -EINVAL; + } /* switch */ + + return 0; +} + +static int gpio_pwm_set_mode(unsigned long arg, int pwm_port) +{ + int pinmux_pwm = pinmux_pwm0 + pwm_port; + int mode; + reg_gio_rw_pwm0_ctrl rw_pwm_ctrl = { + .ccd_val = 0, + .ccd_override = regk_gio_no, + .mode = regk_gio_no + }; + int allocstatus; + + if (get_user(mode, &((struct io_pwm_set_mode *) arg)->mode)) + return -EFAULT; + rw_pwm_ctrl.mode = mode; + if (mode != PWM_OFF) + allocstatus = crisv32_pinmux_alloc_fixed(pinmux_pwm); + else + allocstatus = crisv32_pinmux_dealloc_fixed(pinmux_pwm); + if (allocstatus) + return allocstatus; + REG_WRITE(reg_gio_rw_pwm0_ctrl, REG_ADDR(gio, regi_gio, rw_pwm0_ctrl) + + 12 * pwm_port, rw_pwm_ctrl); + return 0; +} + +static int gpio_pwm_set_period(unsigned long arg, int pwm_port) +{ + struct io_pwm_set_period periods; + reg_gio_rw_pwm0_var rw_pwm_widths; + + if (copy_from_user(&periods, (void __user *)arg, sizeof(periods))) + return -EFAULT; + if (periods.lo > 8191 || periods.hi > 8191) + return -EINVAL; + rw_pwm_widths.lo = periods.lo; + rw_pwm_widths.hi = periods.hi; + REG_WRITE(reg_gio_rw_pwm0_var, REG_ADDR(gio, regi_gio, rw_pwm0_var) + + 12 * pwm_port, rw_pwm_widths); + return 0; +} + +static int gpio_pwm_set_duty(unsigned long arg, int pwm_port) +{ + unsigned int duty; + reg_gio_rw_pwm0_data rw_pwm_duty; + + if (get_user(duty, &((struct io_pwm_set_duty *) arg)->duty)) + return -EFAULT; + if (duty > 255) + return -EINVAL; + rw_pwm_duty.data = duty; + REG_WRITE(reg_gio_rw_pwm0_data, REG_ADDR(gio, regi_gio, rw_pwm0_data) + + 12 * pwm_port, rw_pwm_duty); + return 0; +} + +static int gpio_pwm_ioctl(struct gpio_private *priv, unsigned int cmd, + unsigned long arg) +{ + int pwm_port = priv->minor - GPIO_MINOR_PWM0; + + switch (_IOC_NR(cmd)) { + case IO_PWM_SET_MODE: + return gpio_pwm_set_mode(arg, pwm_port); + case IO_PWM_SET_PERIOD: + return gpio_pwm_set_period(arg, pwm_port); + case IO_PWM_SET_DUTY: + return gpio_pwm_set_duty(arg, pwm_port); + default: + return -EINVAL; + } + return 0; +} + +static const struct file_operations gpio_fops = { + .owner = THIS_MODULE, + .poll = gpio_poll, + .ioctl = gpio_ioctl, + .write = gpio_write, + .open = gpio_open, + .release = gpio_release, +}; + +#ifdef CONFIG_ETRAX_VIRTUAL_GPIO +static void __init virtual_gpio_init(void) +{ + reg_gio_rw_intr_cfg intr_cfg; + reg_gio_rw_intr_mask intr_mask; + unsigned short shadow; + + shadow = ~virtual_rw_pv_oe; /* Input ports should be set to logic 1 */ + shadow |= CONFIG_ETRAX_DEF_GIO_PV_OUT; + i2c_write(VIRT_I2C_ADDR, (void *)&shadow, sizeof(shadow)); + + /* Set interrupt mask and on what state the interrupt shall trigger. + * For virtual gpio the interrupt shall trigger on logic '0'. + */ + intr_cfg = REG_RD(gio, regi_gio, rw_intr_cfg); + intr_mask = REG_RD(gio, regi_gio, rw_intr_mask); + + switch (CONFIG_ETRAX_VIRTUAL_GPIO_INTERRUPT_PA_PIN) { + case 0: + intr_cfg.pa0 = regk_gio_lo; + intr_mask.pa0 = regk_gio_yes; + break; + case 1: + intr_cfg.pa1 = regk_gio_lo; + intr_mask.pa1 = regk_gio_yes; + break; + case 2: + intr_cfg.pa2 = regk_gio_lo; + intr_mask.pa2 = regk_gio_yes; + break; + case 3: + intr_cfg.pa3 = regk_gio_lo; + intr_mask.pa3 = regk_gio_yes; + break; + case 4: + intr_cfg.pa4 = regk_gio_lo; + intr_mask.pa4 = regk_gio_yes; + break; + case 5: + intr_cfg.pa5 = regk_gio_lo; + intr_mask.pa5 = regk_gio_yes; + break; + case 6: + intr_cfg.pa6 = regk_gio_lo; + intr_mask.pa6 = regk_gio_yes; + break; + case 7: + intr_cfg.pa7 = regk_gio_lo; + intr_mask.pa7 = regk_gio_yes; + break; + } + + REG_WR(gio, regi_gio, rw_intr_cfg, intr_cfg); + REG_WR(gio, regi_gio, rw_intr_mask, intr_mask); +} +#endif + +/* main driver initialization routine, called from mem.c */ + +static int __init gpio_init(void) +{ + int res; + + printk(KERN_INFO "ETRAX FS GPIO driver v2.7, (c) 2003-2008 " + "Axis Communications AB\n"); + + /* do the formalities */ + + res = register_chrdev(GPIO_MAJOR, gpio_name, &gpio_fops); + if (res < 0) { + printk(KERN_ERR "gpio: couldn't get a major number.\n"); + return res; + } + + /* Clear all leds */ + CRIS_LED_NETWORK_GRP0_SET(0); + CRIS_LED_NETWORK_GRP1_SET(0); + CRIS_LED_ACTIVE_SET(0); + CRIS_LED_DISK_READ(0); + CRIS_LED_DISK_WRITE(0); + + int res2 = request_irq(GIO_INTR_VECT, gpio_interrupt, + IRQF_SHARED | IRQF_DISABLED, "gpio", &alarmlist); + if (res2) { + printk(KERN_ERR "err: irq for gpio\n"); + return res2; + } + + /* No IRQs by default. */ + REG_WR_INT(gio, regi_gio, rw_intr_pins, 0); + +#ifdef CONFIG_ETRAX_VIRTUAL_GPIO + virtual_gpio_init(); +#endif + + return res; +} + +/* this makes sure that gpio_init is called during kernel boot */ + +module_init(gpio_init); |