| /* Copyright (c) 2011-2013, The Linux Foundation. All rights reserved. |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License version 2 and |
| * only version 2 as published by the Free Software Foundation. |
| * |
| * 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. |
| */ |
| |
| #include <linux/init.h> |
| #include <linux/module.h> |
| #include <linux/fs.h> |
| #include <linux/slab.h> |
| #include <linux/miscdevice.h> |
| #include <linux/spinlock.h> |
| #include <linux/uaccess.h> |
| #include <linux/io.h> |
| #include <linux/irq.h> |
| #include <linux/interrupt.h> |
| #include <linux/sched.h> |
| #include <linux/wait.h> |
| #include <linux/poll.h> |
| #include <mach/msm_iomap.h> |
| |
| #include <linux/fsm_dfe_hh.h> |
| |
| /* |
| * DFE of FSM9XXX |
| */ |
| |
| #define HH_ADDR_MASK 0x000ffffc |
| #define HH_OFFSET_VALID(offset) (((offset) & ~HH_ADDR_MASK) == 0) |
| #define HH_REG_IOADDR(offset) ((uint8_t *) MSM_HH_BASE + (offset)) |
| #define HH_MAKE_OFFSET(blk, adr) (((blk)&0x1F)<<15|((adr)&0x1FFF)<<2) |
| |
| #define HH_REG_SCPN_IREQ_MASK HH_REG_IOADDR(HH_MAKE_OFFSET(5, 0x12)) |
| #define HH_REG_SCPN_IREQ_FLAG HH_REG_IOADDR(HH_MAKE_OFFSET(5, 0x13)) |
| |
| /* |
| * Device private information per device node |
| */ |
| |
| #define HH_IRQ_FIFO_SIZE 64 |
| #define HH_IRQ_FIFO_EMPTY(pdev) ((pdev)->irq_fifo_head == \ |
| (pdev)->irq_fifo_tail) |
| #define HH_IRQ_FIFO_FULL(pdev) ((((pdev)->irq_fifo_tail + 1) % \ |
| HH_IRQ_FIFO_SIZE) == \ |
| (pdev)->irq_fifo_head) |
| |
| #define UINT32_MAX (0xFFFFFFFFU) |
| |
| static struct hh_dev_node_info { |
| spinlock_t hh_lock; |
| char irq_fifo[HH_IRQ_FIFO_SIZE]; |
| unsigned int irq_fifo_head, irq_fifo_tail; |
| wait_queue_head_t wq; |
| } hh_dev_info; |
| |
| /* |
| * Device private information per file |
| */ |
| |
| struct hh_dev_file_info { |
| /* Buffer */ |
| unsigned int *parray; |
| unsigned int array_num; |
| |
| struct dfe_command_entry *pcmd; |
| unsigned int cmd_num; |
| }; |
| |
| /* |
| * File interface |
| */ |
| |
| static int hh_open(struct inode *inode, struct file *file) |
| { |
| struct hh_dev_file_info *pdfi; |
| |
| /* private data allocation */ |
| pdfi = kmalloc(sizeof(*pdfi), GFP_KERNEL); |
| if (pdfi == NULL) |
| return -ENOMEM; |
| file->private_data = pdfi; |
| |
| /* buffer initialization */ |
| pdfi->parray = NULL; |
| pdfi->array_num = 0; |
| pdfi->pcmd = NULL; |
| pdfi->cmd_num = 0; |
| |
| return 0; |
| } |
| |
| static int hh_release(struct inode *inode, struct file *file) |
| { |
| struct hh_dev_file_info *pdfi; |
| |
| pdfi = (struct hh_dev_file_info *) file->private_data; |
| |
| kfree(pdfi->parray); |
| pdfi->parray = NULL; |
| pdfi->array_num = 0; |
| |
| kfree(pdfi->pcmd); |
| pdfi->pcmd = NULL; |
| pdfi->cmd_num = 0; |
| |
| kfree(file->private_data); |
| file->private_data = NULL; |
| |
| return 0; |
| } |
| |
| static ssize_t hh_read(struct file *filp, char __user *buf, size_t count, |
| loff_t *f_pos) |
| { |
| signed char irq = -1; |
| unsigned long irq_flags; |
| |
| do { |
| spin_lock_irqsave(&hh_dev_info.hh_lock, irq_flags); |
| if (!HH_IRQ_FIFO_EMPTY(&hh_dev_info)) { |
| irq = hh_dev_info.irq_fifo[hh_dev_info.irq_fifo_head]; |
| if (++hh_dev_info.irq_fifo_head == HH_IRQ_FIFO_SIZE) |
| hh_dev_info.irq_fifo_head = 0; |
| } |
| spin_unlock_irqrestore(&hh_dev_info.hh_lock, irq_flags); |
| |
| if (irq < 0) |
| if (wait_event_interruptible(hh_dev_info.wq, |
| !HH_IRQ_FIFO_EMPTY(&hh_dev_info)) < 0) |
| break; |
| } while (irq < 0); |
| |
| if (irq < 0) { |
| /* No pending interrupt */ |
| return 0; |
| } else { |
| put_user(irq, buf); |
| return 1; |
| } |
| |
| return 0; |
| } |
| |
| static ssize_t hh_write(struct file *file, const char __user *buffer, |
| size_t count, loff_t *ppos) |
| { |
| return 0; |
| } |
| |
| static long hh_ioctl(struct file *file, |
| unsigned int cmd, unsigned long arg) |
| { |
| unsigned int __user *argp = (unsigned int __user *) arg; |
| struct hh_dev_file_info *pdfi = |
| (struct hh_dev_file_info *) file->private_data; |
| |
| switch (cmd) { |
| case DFE_IOCTL_READ_REGISTER: |
| { |
| unsigned int offset, value; |
| |
| if (get_user(offset, argp)) |
| return -EFAULT; |
| if (!HH_OFFSET_VALID(offset)) |
| return -EINVAL; |
| value = __raw_readl(HH_REG_IOADDR(offset)); |
| if (put_user(value, argp)) |
| return -EFAULT; |
| } |
| break; |
| |
| case DFE_IOCTL_WRITE_REGISTER: |
| { |
| struct dfe_write_register_param param; |
| |
| if (copy_from_user(¶m, argp, sizeof param)) |
| return -EFAULT; |
| if (!HH_OFFSET_VALID(param.offset)) |
| return -EINVAL; |
| __raw_writel(param.value, |
| HH_REG_IOADDR(param.offset)); |
| } |
| break; |
| |
| case DFE_IOCTL_WRITE_REGISTER_WITH_MASK: |
| { |
| struct dfe_write_register_mask_param param; |
| unsigned int value; |
| unsigned long irq_flags; |
| |
| if (copy_from_user(¶m, argp, sizeof param)) |
| return -EFAULT; |
| if (!HH_OFFSET_VALID(param.offset)) |
| return -EINVAL; |
| spin_lock_irqsave(&hh_dev_info.hh_lock, |
| irq_flags); |
| value = __raw_readl(HH_REG_IOADDR(param.offset)); |
| value &= ~param.mask; |
| value |= param.value & param.mask; |
| __raw_writel(value, HH_REG_IOADDR(param.offset)); |
| spin_unlock_irqrestore(&hh_dev_info.hh_lock, |
| irq_flags); |
| } |
| break; |
| |
| case DFE_IOCTL_READ_REGISTER_ARRAY: |
| case DFE_IOCTL_WRITE_REGISTER_ARRAY: |
| { |
| struct dfe_read_write_array_param param; |
| unsigned int req_sz; |
| unsigned long irq_flags; |
| unsigned int i; |
| void *addr; |
| |
| if (copy_from_user(¶m, argp, sizeof param)) |
| return -EFAULT; |
| if (!HH_OFFSET_VALID(param.offset)) |
| return -EINVAL; |
| if (param.num == 0) |
| break; |
| req_sz = sizeof(unsigned int) * param.num; |
| |
| if (pdfi->array_num < param.num) { |
| void *pmem; |
| |
| pmem = kmalloc(req_sz, GFP_KERNEL); |
| if (pmem == NULL) |
| return -ENOMEM; |
| pdfi->parray = (unsigned int *) pmem; |
| pdfi->array_num = param.num; |
| } |
| |
| if (cmd == DFE_IOCTL_WRITE_REGISTER_ARRAY) |
| if (copy_from_user(pdfi->parray, |
| param.pArray, req_sz)) |
| return -EFAULT; |
| |
| addr = HH_REG_IOADDR(param.offset); |
| |
| spin_lock_irqsave(&hh_dev_info.hh_lock, |
| irq_flags); |
| for (i = 0; i < param.num; ++i, addr += 4) { |
| if (cmd == DFE_IOCTL_READ_REGISTER_ARRAY) |
| pdfi->parray[i] = __raw_readl(addr); |
| else |
| __raw_writel(pdfi->parray[i], addr); |
| } |
| spin_unlock_irqrestore(&hh_dev_info.hh_lock, |
| irq_flags); |
| |
| if (cmd == DFE_IOCTL_READ_REGISTER_ARRAY) |
| if (copy_to_user(pdfi->parray, |
| param.pArray, req_sz)) |
| return -EFAULT; |
| } |
| break; |
| |
| case DFE_IOCTL_COMMAND: |
| { |
| struct dfe_command_param param; |
| unsigned int req_sz; |
| unsigned long irq_flags; |
| unsigned int i, value; |
| struct dfe_command_entry *pcmd; |
| void *addr; |
| |
| if (copy_from_user(¶m, argp, sizeof param)) |
| return -EFAULT; |
| if ((param.num == 0) || |
| (param.num >= (UINT32_MAX / |
| sizeof(struct dfe_command_entry)))) |
| return -EINVAL; |
| req_sz = sizeof(struct dfe_command_entry) * param.num; |
| |
| if (pdfi->cmd_num < param.num) { |
| void *pmem; |
| |
| pmem = kmalloc(req_sz, GFP_KERNEL); |
| if (pmem == NULL) |
| return -ENOMEM; |
| pdfi->pcmd = (struct dfe_command_entry *) pmem; |
| pdfi->cmd_num = param.num; |
| } |
| |
| if (copy_from_user(pdfi->pcmd, param.pEntry, req_sz)) |
| return -EFAULT; |
| |
| pcmd = pdfi->pcmd; |
| |
| spin_lock_irqsave(&hh_dev_info.hh_lock, |
| irq_flags); |
| for (i = 0; i < param.num; ++i, ++pcmd) { |
| if (!HH_OFFSET_VALID(pcmd->offset)) |
| return -EINVAL; |
| addr = HH_REG_IOADDR(pcmd->offset); |
| |
| switch (pcmd->code) { |
| case DFE_IOCTL_COMMAND_CODE_WRITE: |
| __raw_writel(pcmd->value, addr); |
| break; |
| case DFE_IOCTL_COMMAND_CODE_WRITE_WITH_MASK: |
| value = __raw_readl(addr); |
| value &= ~pcmd->mask; |
| value |= pcmd->value & pcmd->mask; |
| __raw_writel(value, addr); |
| break; |
| } |
| } |
| spin_unlock_irqrestore(&hh_dev_info.hh_lock, |
| irq_flags); |
| } |
| break; |
| |
| default: |
| return -EINVAL; |
| } |
| |
| return 0; |
| } |
| |
| static unsigned int hh_poll(struct file *filp, |
| struct poll_table_struct *wait) |
| { |
| unsigned mask = 0; |
| |
| if (!HH_IRQ_FIFO_EMPTY(&hh_dev_info)) |
| mask |= POLLIN; |
| |
| if (mask == 0) { |
| poll_wait(filp, &hh_dev_info.wq, wait); |
| if (!HH_IRQ_FIFO_EMPTY(&hh_dev_info)) |
| mask |= POLLIN; |
| } |
| |
| return mask; |
| } |
| |
| static const struct file_operations hh_fops = { |
| .owner = THIS_MODULE, |
| .open = hh_open, |
| .release = hh_release, |
| .read = hh_read, |
| .write = hh_write, |
| .unlocked_ioctl = hh_ioctl, |
| .poll = hh_poll, |
| }; |
| |
| /* |
| * Interrupt handling |
| */ |
| |
| static irqreturn_t hh_irq_handler(int irq, void *data) |
| { |
| unsigned int irq_enable, irq_flag, irq_mask; |
| int i; |
| |
| irq_enable = __raw_readl(HH_REG_SCPN_IREQ_MASK); |
| irq_flag = __raw_readl(HH_REG_SCPN_IREQ_FLAG); |
| irq_flag &= irq_enable; |
| |
| /* Disables interrupts */ |
| irq_enable &= ~irq_flag; |
| __raw_writel(irq_enable, HH_REG_SCPN_IREQ_MASK); |
| |
| /* Adds the pending interrupts to irq_fifo */ |
| spin_lock(&hh_dev_info.hh_lock); |
| for (i = 0, irq_mask = 1; i < 32; ++i, irq_mask <<= 1) { |
| if (HH_IRQ_FIFO_FULL(&hh_dev_info)) |
| break; |
| if (irq_flag & irq_mask) { |
| hh_dev_info.irq_fifo[hh_dev_info.irq_fifo_tail] = \ |
| (char) i; |
| if (++hh_dev_info.irq_fifo_tail == HH_IRQ_FIFO_SIZE) |
| hh_dev_info.irq_fifo_tail = 0; |
| } |
| } |
| spin_unlock(&hh_dev_info.hh_lock); |
| |
| /* Wakes up pending processes */ |
| wake_up_interruptible(&hh_dev_info.wq); |
| |
| return IRQ_HANDLED; |
| } |
| |
| /* |
| * Driver initialization & cleanup |
| */ |
| |
| static struct miscdevice hh_misc_dev = { |
| .minor = MISC_DYNAMIC_MINOR, |
| .name = DFE_HH_DEVICE_NAME, |
| .fops = &hh_fops, |
| }; |
| |
| static int __init hh_init(void) |
| { |
| int ret; |
| |
| /* lock initialization */ |
| spin_lock_init(&hh_dev_info.hh_lock); |
| |
| /* interrupt handler */ |
| hh_dev_info.irq_fifo_head = 0; |
| hh_dev_info.irq_fifo_tail = 0; |
| ret = request_irq(INT_HH_SUPSS_IRQ, hh_irq_handler, |
| IRQF_TRIGGER_RISING, "hh_dev", 0); |
| if (ret < 0) { |
| pr_err("Cannot register HH interrupt handler.\n"); |
| return ret; |
| } |
| |
| /* wait queue */ |
| init_waitqueue_head(&hh_dev_info.wq); |
| |
| return misc_register(&hh_misc_dev); |
| } |
| |
| static void __exit hh_exit(void) |
| { |
| misc_deregister(&hh_misc_dev); |
| free_irq(INT_HH_SUPSS_IRQ, 0); |
| } |
| |
| MODULE_LICENSE("GPL v2"); |
| MODULE_AUTHOR("Rohit Vaswani <rvaswani@codeaurora.org>"); |
| MODULE_DESCRIPTION("Qualcomm Hammerhead Digital Front End driver"); |
| MODULE_VERSION("1.0"); |
| |
| module_init(hh_init); |
| module_exit(hh_exit); |
| |