diff options
Diffstat (limited to 'drivers/staging/poch/poch.c')
| -rw-r--r-- | drivers/staging/poch/poch.c | 1443 |
1 files changed, 0 insertions, 1443 deletions
diff --git a/drivers/staging/poch/poch.c b/drivers/staging/poch/poch.c deleted file mode 100644 index f940a34c1a0c..000000000000 --- a/drivers/staging/poch/poch.c +++ /dev/null @@ -1,1443 +0,0 @@ -/* - * User-space DMA and UIO based Redrapids Pocket Change CardBus driver - * - * Copyright 2008 Vijay Kumar <vijaykumar@bravegnu.org> - * - * Licensed under GPL version 2 only. - */ - -#include <linux/device.h> -#include <linux/module.h> -#include <linux/pci.h> -#include <linux/uio_driver.h> -#include <linux/spinlock.h> -#include <linux/cdev.h> -#include <linux/delay.h> -#include <linux/sysfs.h> -#include <linux/poll.h> -#include <linux/idr.h> -#include <linux/interrupt.h> -#include <linux/init.h> -#include <linux/ioctl.h> -#include <linux/io.h> -#include <linux/sched.h> -#include <linux/slab.h> - -#include "poch.h" - -#include <asm/cacheflush.h> - -#ifndef PCI_VENDOR_ID_RRAPIDS -#define PCI_VENDOR_ID_RRAPIDS 0x17D2 -#endif - -#ifndef PCI_DEVICE_ID_RRAPIDS_POCKET_CHANGE -#define PCI_DEVICE_ID_RRAPIDS_POCKET_CHANGE 0x0351 -#endif - -#define POCH_NCHANNELS 2 - -#define MAX_POCH_CARDS 8 -#define MAX_POCH_DEVICES (MAX_POCH_CARDS * POCH_NCHANNELS) - -#define DRV_NAME "poch" -#define PFX DRV_NAME ": " - -/* - * BAR0 Bridge Register Definitions - */ - -#define BRIDGE_REV_REG 0x0 -#define BRIDGE_INT_MASK_REG 0x4 -#define BRIDGE_INT_STAT_REG 0x8 - -#define BRIDGE_INT_ACTIVE (0x1 << 31) -#define BRIDGE_INT_FPGA (0x1 << 2) -#define BRIDGE_INT_TEMP_FAIL (0x1 << 1) -#define BRIDGE_INT_TEMP_WARN (0x1 << 0) - -#define BRIDGE_FPGA_RESET_REG 0xC - -#define BRIDGE_CARD_POWER_REG 0x10 -#define BRIDGE_CARD_POWER_EN (0x1 << 0) -#define BRIDGE_CARD_POWER_PROG_DONE (0x1 << 31) - -#define BRIDGE_JTAG_REG 0x14 -#define BRIDGE_DMA_GO_REG 0x18 -#define BRIDGE_STAT_0_REG 0x1C -#define BRIDGE_STAT_1_REG 0x20 -#define BRIDGE_STAT_2_REG 0x24 -#define BRIDGE_STAT_3_REG 0x28 -#define BRIDGE_TEMP_STAT_REG 0x2C -#define BRIDGE_TEMP_THRESH_REG 0x30 -#define BRIDGE_EEPROM_REVSEL_REG 0x34 -#define BRIDGE_CIS_STRUCT_REG 0x100 -#define BRIDGE_BOARDREV_REG 0x124 - -/* - * BAR1 FPGA Register Definitions - */ - -#define FPGA_IFACE_REV_REG 0x0 -#define FPGA_RX_BLOCK_SIZE_REG 0x8 -#define FPGA_TX_BLOCK_SIZE_REG 0xC -#define FPGA_RX_BLOCK_COUNT_REG 0x10 -#define FPGA_TX_BLOCK_COUNT_REG 0x14 -#define FPGA_RX_CURR_DMA_BLOCK_REG 0x18 -#define FPGA_TX_CURR_DMA_BLOCK_REG 0x1C -#define FPGA_RX_GROUP_COUNT_REG 0x20 -#define FPGA_TX_GROUP_COUNT_REG 0x24 -#define FPGA_RX_CURR_GROUP_REG 0x28 -#define FPGA_TX_CURR_GROUP_REG 0x2C -#define FPGA_RX_CURR_PCI_REG 0x38 -#define FPGA_TX_CURR_PCI_REG 0x3C -#define FPGA_RX_GROUP0_START_REG 0x40 -#define FPGA_TX_GROUP0_START_REG 0xC0 -#define FPGA_DMA_DESC_1_REG 0x140 -#define FPGA_DMA_DESC_2_REG 0x144 -#define FPGA_DMA_DESC_3_REG 0x148 -#define FPGA_DMA_DESC_4_REG 0x14C - -#define FPGA_DMA_INT_STAT_REG 0x150 -#define FPGA_DMA_INT_MASK_REG 0x154 -#define FPGA_DMA_INT_RX (1 << 0) -#define FPGA_DMA_INT_TX (1 << 1) - -#define FPGA_RX_GROUPS_PER_INT_REG 0x158 -#define FPGA_TX_GROUPS_PER_INT_REG 0x15C -#define FPGA_DMA_ADR_PAGE_REG 0x160 -#define FPGA_FPGA_REV_REG 0x200 - -#define FPGA_ADC_CLOCK_CTL_REG 0x204 -#define FPGA_ADC_CLOCK_CTL_OSC_EN (0x1 << 3) -#define FPGA_ADC_CLOCK_LOCAL_CLK (0x1 | FPGA_ADC_CLOCK_CTL_OSC_EN) -#define FPGA_ADC_CLOCK_EXT_SAMP_CLK 0X0 - -#define FPGA_ADC_DAC_EN_REG 0x208 -#define FPGA_ADC_DAC_EN_DAC_OFF (0x1 << 1) -#define FPGA_ADC_DAC_EN_ADC_OFF (0x1 << 0) - -#define FPGA_INT_STAT_REG 0x20C -#define FPGA_INT_MASK_REG 0x210 -#define FPGA_INT_PLL_UNLOCKED (0x1 << 9) -#define FPGA_INT_DMA_CORE (0x1 << 8) -#define FPGA_INT_TX_FF_EMPTY (0x1 << 7) -#define FPGA_INT_RX_FF_EMPTY (0x1 << 6) -#define FPGA_INT_TX_FF_OVRFLW (0x1 << 3) -#define FPGA_INT_RX_FF_OVRFLW (0x1 << 2) -#define FPGA_INT_TX_ACQ_DONE (0x1 << 1) -#define FPGA_INT_RX_ACQ_DONE (0x1) - -#define FPGA_RX_CTL_REG 0x214 -#define FPGA_RX_CTL_FIFO_FLUSH (0x1 << 9) -#define FPGA_RX_CTL_SYNTH_DATA (0x1 << 8) -#define FPGA_RX_CTL_CONT_CAP (0x0 << 1) -#define FPGA_RX_CTL_SNAP_CAP (0x1 << 1) - -#define FPGA_RX_ARM_REG 0x21C - -#define FPGA_DOM_REG 0x224 -#define FPGA_DOM_DCM_RESET (0x1 << 5) -#define FPGA_DOM_SOFT_RESET (0x1 << 4) -#define FPGA_DOM_DUAL_M_SG_DMA (0x0) -#define FPGA_DOM_TARGET_ACCESS (0x1) - -#define FPGA_TX_CTL_REG 0x228 -#define FPGA_TX_CTL_FIFO_FLUSH (0x1 << 9) -#define FPGA_TX_CTL_OUTPUT_ZERO (0x0 << 2) -#define FPGA_TX_CTL_OUTPUT_CARDBUS (0x1 << 2) -#define FPGA_TX_CTL_OUTPUT_ADC (0x2 << 2) -#define FPGA_TX_CTL_OUTPUT_SNAPSHOT (0x3 << 2) -#define FPGA_TX_CTL_LOOPBACK (0x1 << 0) - -#define FPGA_ENDIAN_MODE_REG 0x22C -#define FPGA_RX_FIFO_COUNT_REG 0x28C -#define FPGA_TX_ENABLE_REG 0x298 -#define FPGA_TX_TRIGGER_REG 0x29C -#define FPGA_TX_DATAMEM_COUNT_REG 0x2A8 -#define FPGA_CAP_FIFO_REG 0x300 -#define FPGA_TX_SNAPSHOT_REG 0x8000 - -/* - * Channel Index Definitions - */ - -enum { - CHNO_RX_CHANNEL, - CHNO_TX_CHANNEL, -}; - -struct poch_dev; - -enum channel_dir { - CHANNEL_DIR_RX, - CHANNEL_DIR_TX, -}; - -struct poch_group_info { - struct page *pg; - dma_addr_t dma_addr; - unsigned long user_offset; -}; - -struct channel_info { - unsigned int chno; - - atomic_t sys_block_size; - atomic_t sys_group_size; - atomic_t sys_group_count; - - enum channel_dir dir; - - unsigned long block_size; - unsigned long group_size; - unsigned long group_count; - - /* Contains the DMA address and VM offset of each group. */ - struct poch_group_info *groups; - - /* Contains the header and circular buffer exported to userspace. */ - spinlock_t group_offsets_lock; - - /* Last group consumed by user space. */ - unsigned int consumed; - /* Last group indicated as 'complete' to user space. */ - unsigned int transfer; - - wait_queue_head_t wq; - - union { - unsigned int data_available; - unsigned int space_available; - }; - - void __iomem *bridge_iomem; - void __iomem *fpga_iomem; - spinlock_t *iomem_lock; - - atomic_t free; - atomic_t inited; - - /* Error counters */ - struct poch_counters counters; - spinlock_t counters_lock; - - struct device *dev; -}; - -struct poch_dev { - struct uio_info uio; - struct pci_dev *pci_dev; - unsigned int nchannels; - struct channel_info channels[POCH_NCHANNELS]; - struct cdev cdev; - - /* Counts the no. of channels that have been opened. On first - * open, the card is powered on. On last channel close, the - * card is powered off. - */ - atomic_t usage; - - void __iomem *bridge_iomem; - void __iomem *fpga_iomem; - spinlock_t iomem_lock; - - struct device *dev; -}; - -static int synth_rx; -module_param(synth_rx, bool, 0600); -MODULE_PARM_DESC(synth_rx, - "Synthesize received values using a counter. Default: No"); - -static int loopback; -module_param(loopback, bool, 0600); -MODULE_PARM_DESC(loopback, - "Enable hardware loopback of trasnmitted data. Default: No"); - -static dev_t poch_first_dev; -static struct class *poch_cls; -static DEFINE_IDR(poch_ids); - -static ssize_t store_block_size(struct device *dev, - struct device_attribute *attr, - const char *buf, size_t count) -{ - struct channel_info *channel = dev_get_drvdata(dev); - unsigned long block_size; - - sscanf(buf, "%lu", &block_size); - atomic_set(&channel->sys_block_size, block_size); - - return count; -} -static DEVICE_ATTR(block_size, S_IWUSR|S_IWGRP, NULL, store_block_size); - -static ssize_t store_group_size(struct device *dev, - struct device_attribute *attr, - const char *buf, size_t count) -{ - struct channel_info *channel = dev_get_drvdata(dev); - unsigned long group_size; - - sscanf(buf, "%lu", &group_size); - atomic_set(&channel->sys_group_size, group_size); - - return count; -} -static DEVICE_ATTR(group_size, S_IWUSR|S_IWGRP, NULL, store_group_size); - -static ssize_t store_group_count(struct device *dev, - struct device_attribute *attr, - const char *buf, size_t count) -{ - struct channel_info *channel = dev_get_drvdata(dev); - unsigned long group_count; - - sscanf(buf, "%lu", &group_count); - atomic_set(&channel->sys_group_count, group_count); - - return count; -} -static DEVICE_ATTR(group_count, S_IWUSR|S_IWGRP, NULL, store_group_count); - -static ssize_t show_direction(struct device *dev, - struct device_attribute *attr, char *buf) -{ - struct channel_info *channel = dev_get_drvdata(dev); - int len; - - len = sprintf(buf, "%s\n", (channel->dir ? "tx" : "rx")); - return len; -} -static DEVICE_ATTR(dir, S_IRUSR|S_IRGRP, show_direction, NULL); - -static unsigned long npages(unsigned long bytes) -{ - if (bytes % PAGE_SIZE == 0) - return bytes / PAGE_SIZE; - else - return (bytes / PAGE_SIZE) + 1; -} - -static ssize_t show_mmap_size(struct device *dev, - struct device_attribute *attr, char *buf) -{ - struct channel_info *channel = dev_get_drvdata(dev); - int len; - unsigned long mmap_size; - unsigned long group_pages; - unsigned long total_group_pages; - - group_pages = npages(channel->group_size); - total_group_pages = group_pages * channel->group_count; - - mmap_size = total_group_pages * PAGE_SIZE; - len = sprintf(buf, "%lu\n", mmap_size); - return len; -} -static DEVICE_ATTR(mmap_size, S_IRUSR|S_IRGRP, show_mmap_size, NULL); - -static struct device_attribute *poch_class_attrs[] = { - &dev_attr_block_size, - &dev_attr_group_size, - &dev_attr_group_count, - &dev_attr_dir, - &dev_attr_mmap_size, -}; - -static void poch_channel_free_groups(struct channel_info *channel) -{ - unsigned long i; - - for (i = 0; i < channel->group_count; i++) { - struct poch_group_info *group; - unsigned int order; - - group = &channel->groups[i]; - order = get_order(channel->group_size); - if (group->pg) - __free_pages(group->pg, order); - } -} - -static int poch_channel_alloc_groups(struct channel_info *channel) -{ - unsigned long i; - unsigned long group_pages; - - group_pages = npages(channel->group_size); - - for (i = 0; i < channel->group_count; i++) { - struct poch_group_info *group; - unsigned int order; - gfp_t gfp_mask; - - group = &channel->groups[i]; - order = get_order(channel->group_size); - - /* - * __GFP_COMP is required here since we are going to - * perform non-linear mapping to userspace. For more - * information read the vm_insert_page() function - * comments. - */ - - gfp_mask = GFP_KERNEL | GFP_DMA32 | __GFP_ZERO; - group->pg = alloc_pages(gfp_mask, order); - if (!group->pg) { - poch_channel_free_groups(channel); - return -ENOMEM; - } - - /* FIXME: This is the physical address not the bus - * address! This won't work in architectures that - * have an IOMMU. Can we use pci_map_single() for - * this? - */ - group->dma_addr = page_to_pfn(group->pg) * PAGE_SIZE; - group->user_offset = (i * group_pages) * PAGE_SIZE; - - printk(KERN_INFO PFX "%ld: user_offset: 0x%lx\n", i, - group->user_offset); - } - - return 0; -} - -static int channel_latch_attr(struct channel_info *channel) -{ - channel->group_count = atomic_read(&channel->sys_group_count); - channel->group_size = atomic_read(&channel->sys_group_size); - channel->block_size = atomic_read(&channel->sys_block_size); - - if (channel->group_count == 0) { - printk(KERN_ERR PFX "invalid group count %lu", - channel->group_count); - return -EINVAL; - } - - if (channel->group_size == 0 || - channel->group_size < channel->block_size) { - printk(KERN_ERR PFX "invalid group size %lu", - channel->group_size); - return -EINVAL; - } - - if (channel->block_size == 0 || (channel->block_size % 8) != 0) { - printk(KERN_ERR PFX "invalid block size %lu", - channel->block_size); - return -EINVAL; - } - - if (channel->group_size % channel->block_size != 0) { - printk(KERN_ERR PFX - "group size should be multiple of block size"); - return -EINVAL; - } - - return 0; -} - -/* - * Configure DMA group registers - */ -static void channel_dma_init(struct channel_info *channel) -{ - void __iomem *fpga = channel->fpga_iomem; - u32 group_regs_base; - u32 group_reg; - unsigned int page; - unsigned int group_in_page; - unsigned long i; - u32 block_size_reg; - u32 block_count_reg; - u32 group_count_reg; - u32 groups_per_int_reg; - u32 curr_pci_reg; - - if (channel->chno == CHNO_RX_CHANNEL) { - group_regs_base = FPGA_RX_GROUP0_START_REG; - block_size_reg = FPGA_RX_BLOCK_SIZE_REG; - block_count_reg = FPGA_RX_BLOCK_COUNT_REG; - group_count_reg = FPGA_RX_GROUP_COUNT_REG; - groups_per_int_reg = FPGA_RX_GROUPS_PER_INT_REG; - curr_pci_reg = FPGA_RX_CURR_PCI_REG; - } else { - group_regs_base = FPGA_TX_GROUP0_START_REG; - block_size_reg = FPGA_TX_BLOCK_SIZE_REG; - block_count_reg = FPGA_TX_BLOCK_COUNT_REG; - group_count_reg = FPGA_TX_GROUP_COUNT_REG; - groups_per_int_reg = FPGA_TX_GROUPS_PER_INT_REG; - curr_pci_reg = FPGA_TX_CURR_PCI_REG; - } - - printk(KERN_WARNING "block_size, group_size, group_count\n"); - /* - * Block size is represented in no. of 64 bit transfers. - */ - iowrite32(channel->block_size / 8, fpga + block_size_reg); - iowrite32(channel->group_size / channel->block_size, - fpga + block_count_reg); - iowrite32(channel->group_count, fpga + group_count_reg); - /* FIXME: Hardcoded groups per int. Get it from sysfs? */ - iowrite32(16, fpga + groups_per_int_reg); - - /* Unlock PCI address? Not defined in the data sheet, but used - * in the reference code by Redrapids. - */ - iowrite32(0x1, fpga + curr_pci_reg); - - /* The DMA address page register is shared between the RX and - * TX channels, so acquire lock. - */ - for (i = 0; i < channel->group_count; i++) { - page = i / 32; - group_in_page = i % 32; - - group_reg = group_regs_base + (group_in_page * 4); - - spin_lock(channel->iomem_lock); - iowrite32(page, fpga + FPGA_DMA_ADR_PAGE_REG); - iowrite32(channel->groups[i].dma_addr, fpga + group_reg); - spin_unlock(channel->iomem_lock); - } - - for (i = 0; i < channel->group_count; i++) { - page = i / 32; - group_in_page = i % 32; - - group_reg = group_regs_base + (group_in_page * 4); - - spin_lock(channel->iomem_lock); - iowrite32(page, fpga + FPGA_DMA_ADR_PAGE_REG); - printk(KERN_INFO PFX "%ld: read dma_addr: 0x%x\n", i, - ioread32(fpga + group_reg)); - spin_unlock(channel->iomem_lock); - } - -} - -static void __poch_channel_clear_counters(struct channel_info *channel) -{ - channel->counters.pll_unlock = 0; - channel->counters.fifo_empty = 0; - channel->counters.fifo_overflow = 0; -} - -static int poch_channel_init(struct channel_info *channel, - struct poch_dev *poch_dev) -{ - struct pci_dev *pdev = poch_dev->pci_dev; - struct device *dev = &pdev->dev; - unsigned long alloc_size; - int ret; - - printk(KERN_WARNING "channel_latch_attr\n"); - - ret = channel_latch_attr(channel); - if (ret != 0) - goto out; - - channel->consumed = 0; - channel->transfer = 0; - - /* Allocate memory to hold group information. */ - alloc_size = channel->group_count * sizeof(struct poch_group_info); - channel->groups = kzalloc(alloc_size, GFP_KERNEL); - if (!channel->groups) { - dev_err(dev, "error allocating memory for group info\n"); - ret = -ENOMEM; - goto out; - } - - printk(KERN_WARNING "poch_channel_alloc_groups\n"); - - ret = poch_channel_alloc_groups(channel); - if (ret) { - dev_err(dev, "error allocating groups of order %d\n", - get_order(channel->group_size)); - goto out_free_group_info; - } - - channel->fpga_iomem = poch_dev->fpga_iomem; - channel->bridge_iomem = poch_dev->bridge_iomem; - channel->iomem_lock = &poch_dev->iomem_lock; - spin_lock_init(&channel->counters_lock); - - __poch_channel_clear_counters(channel); - - return 0; - - out_free_group_info: - kfree(channel->groups); - out: - return ret; -} - -static int poch_wait_fpga_prog(void __iomem *bridge) -{ - unsigned long total_wait; - const unsigned long wait_period = 100; - /* FIXME: Get the actual timeout */ - const unsigned long prog_timeo = 10000; /* 10 Seconds */ - u32 card_power; - - printk(KERN_WARNING "poch_wait_fpg_prog\n"); - - printk(KERN_INFO PFX "programming fpga ...\n"); - total_wait = 0; - while (1) { - msleep(wait_period); - total_wait += wait_period; - - card_power = ioread32(bridge + BRIDGE_CARD_POWER_REG); - if (card_power & BRIDGE_CARD_POWER_PROG_DONE) { - printk(KERN_INFO PFX "programming done\n"); - return 0; - } - if (total_wait > prog_timeo) { - printk(KERN_ERR PFX - "timed out while programming FPGA\n"); - return -EIO; - } - } -} - -static void poch_card_power_off(struct poch_dev *poch_dev) -{ - void __iomem *bridge = poch_dev->bridge_iomem; - u32 card_power; - - iowrite32(0, bridge + BRIDGE_INT_MASK_REG); - iowrite32(0, bridge + BRIDGE_DMA_GO_REG); - - card_power = ioread32(bridge + BRIDGE_CARD_POWER_REG); - iowrite32(card_power & ~BRIDGE_CARD_POWER_EN, - bridge + BRIDGE_CARD_POWER_REG); -} - -enum clk_src { - CLK_SRC_ON_BOARD, - CLK_SRC_EXTERNAL -}; - -static void poch_card_clock_on(void __iomem *fpga) -{ - /* FIXME: Get this data through sysfs? */ - enum clk_src clk_src = CLK_SRC_ON_BOARD; - - if (clk_src == CLK_SRC_ON_BOARD) { - iowrite32(FPGA_ADC_CLOCK_LOCAL_CLK | FPGA_ADC_CLOCK_CTL_OSC_EN, - fpga + FPGA_ADC_CLOCK_CTL_REG); - } else if (clk_src == CLK_SRC_EXTERNAL) { - iowrite32(FPGA_ADC_CLOCK_EXT_SAMP_CLK, - fpga + FPGA_ADC_CLOCK_CTL_REG); - } -} - -static int poch_card_power_on(struct poch_dev *poch_dev) -{ - void __iomem *bridge = poch_dev->bridge_iomem; - void __iomem *fpga = poch_dev->fpga_iomem; - - iowrite32(BRIDGE_CARD_POWER_EN, bridge + BRIDGE_CARD_POWER_REG); - - if (poch_wait_fpga_prog(bridge) != 0) { - poch_card_power_off(poch_dev); - return -EIO; - } - - poch_card_clock_on(fpga); - - /* Sync to new clock, reset state machines, set DMA mode. */ - iowrite32(FPGA_DOM_DCM_RESET | FPGA_DOM_SOFT_RESET - | FPGA_DOM_DUAL_M_SG_DMA, fpga + FPGA_DOM_REG); - - /* FIXME: The time required for sync. needs to be tuned. */ - msleep(1000); - - return 0; -} - -static void poch_channel_analog_on(struct channel_info *channel) -{ - void __iomem *fpga = channel->fpga_iomem; - u32 adc_dac_en; - - spin_lock(channel->iomem_lock); - adc_dac_en = ioread32(fpga + FPGA_ADC_DAC_EN_REG); - switch (channel->chno) { - case CHNO_RX_CHANNEL: - iowrite32(adc_dac_en & ~FPGA_ADC_DAC_EN_ADC_OFF, - fpga + FPGA_ADC_DAC_EN_REG); - break; - case CHNO_TX_CHANNEL: - iowrite32(adc_dac_en & ~FPGA_ADC_DAC_EN_DAC_OFF, - fpga + FPGA_ADC_DAC_EN_REG); - break; - } - spin_unlock(channel->iomem_lock); -} - -static int poch_open(struct inode *inode, struct file *filp) -{ - struct poch_dev *poch_dev; - struct channel_info *channel; - void __iomem *bridge; - void __iomem *fpga; - int chno; - int usage; - int ret; - - poch_dev = container_of(inode->i_cdev, struct poch_dev, cdev); - bridge = poch_dev->bridge_iomem; - fpga = poch_dev->fpga_iomem; - - chno = iminor(inode) % poch_dev->nchannels; - channel = &poch_dev->channels[chno]; - - if (!atomic_dec_and_test(&channel->free)) { - atomic_inc(&channel->free); - ret = -EBUSY; - goto out; - } - - usage = atomic_inc_return(&poch_dev->usage); - - printk(KERN_WARNING "poch_card_power_on\n"); - - if (usage == 1) { - ret = poch_card_power_on(poch_dev); - if (ret) - goto out_dec_usage; - } - - printk(KERN_INFO "CardBus Bridge Revision: %x\n", - ioread32(bridge + BRIDGE_REV_REG)); - printk(KERN_INFO "CardBus Interface Revision: %x\n", - ioread32(fpga + FPGA_IFACE_REV_REG)); - - channel->chno = chno; - filp->private_data = channel; - - printk(KERN_WARNING "poch_channel_init\n"); - - ret = poch_channel_init(channel, poch_dev); - if (ret) - goto out_power_off; - - poch_channel_analog_on(channel); - - printk(KERN_WARNING "channel_dma_init\n"); - - channel_dma_init(channel); - - printk(KERN_WARNING "poch_channel_analog_on\n"); - - if (usage == 1) { - printk(KERN_WARNING "setting up DMA\n"); - - /* Initialize DMA Controller. */ - iowrite32(FPGA_CAP_FIFO_REG, bridge + BRIDGE_STAT_2_REG); - iowrite32(FPGA_DMA_DESC_1_REG, bridge + BRIDGE_STAT_3_REG); - - ioread32(fpga + FPGA_DMA_INT_STAT_REG); - ioread32(fpga + FPGA_INT_STAT_REG); - ioread32(bridge + BRIDGE_INT_STAT_REG); - - /* Initialize Interrupts. FIXME: Enable temperature - * handling We are enabling both Tx and Rx channel - * interrupts here. Do we need to enable interrupts - * only for the current channel? Anyways we won't get - * the interrupt unless the DMA is activated. - */ - iowrite32(BRIDGE_INT_FPGA, bridge + BRIDGE_INT_MASK_REG); - iowrite32(FPGA_INT_DMA_CORE - | FPGA_INT_PLL_UNLOCKED - | FPGA_INT_TX_FF_EMPTY - | FPGA_INT_RX_FF_EMPTY - | FPGA_INT_TX_FF_OVRFLW - | FPGA_INT_RX_FF_OVRFLW, - fpga + FPGA_INT_MASK_REG); - iowrite32(FPGA_DMA_INT_RX | FPGA_DMA_INT_TX, - fpga + FPGA_DMA_INT_MASK_REG); - } - - if (channel->dir == CHANNEL_DIR_TX) { - /* Flush TX FIFO and output data from cardbus. */ - u32 ctl_val = 0; - - ctl_val |= FPGA_TX_CTL_FIFO_FLUSH; - ctl_val |= FPGA_TX_CTL_OUTPUT_CARDBUS; - if (loopback) - ctl_val |= FPGA_TX_CTL_LOOPBACK; - - iowrite32(ctl_val, fpga + FPGA_TX_CTL_REG); - } else { - /* Flush RX FIFO and output data to cardbus. */ - u32 ctl_val = FPGA_RX_CTL_CONT_CAP | FPGA_RX_CTL_FIFO_FLUSH; - if (synth_rx) - ctl_val |= FPGA_RX_CTL_SYNTH_DATA; - - iowrite32(ctl_val, fpga + FPGA_RX_CTL_REG); - } - - atomic_inc(&channel->inited); - - return 0; - - out_power_off: - if (usage == 1) - poch_card_power_off(poch_dev); - out_dec_usage: - atomic_dec(&poch_dev->usage); - atomic_inc(&channel->free); - out: - return ret; -} - -static int poch_release(struct inode *inode, struct file *filp) -{ - struct channel_info *channel = filp->private_data; - struct poch_dev *poch_dev; - int usage; - - poch_dev = container_of(inode->i_cdev, struct poch_dev, cdev); - - usage = atomic_dec_return(&poch_dev->usage); - if (usage == 0) { - printk(KERN_WARNING "poch_card_power_off\n"); - poch_card_power_off(poch_dev); - } - - atomic_dec(&channel->inited); - poch_channel_free_groups(channel); - kfree(channel->groups); - atomic_inc(&channel->free); - - return 0; -} - -/* - * Map the the group buffers, to user space. - */ -static int poch_mmap(struct file *filp, struct vm_area_struct *vma) -{ - struct channel_info *channel = filp->private_data; - - unsigned long start; - unsigned long size; - - unsigned long group_pages; - unsigned long total_group_pages; - - int pg_num; - struct page *pg; - - int i; - int ret; - - printk(KERN_WARNING "poch_mmap\n"); - - if (vma->vm_pgoff) { - printk(KERN_WARNING PFX "page offset: %lu\n", vma->vm_pgoff); - return -EINVAL; - } - - group_pages = npages(channel->group_size); - total_group_pages = group_pages * channel->group_count; - - size = vma->vm_end - vma->vm_start; - if (size != total_group_pages * PAGE_SIZE) { - printk(KERN_WARNING PFX "required %lu bytes\n", size); - return -EINVAL; - } - - start = vma->vm_start; - - for (i = 0; i < channel->group_count; i++) { - pg = channel->groups[i].pg; - for (pg_num = 0; pg_num < group_pages; pg_num++, pg++) { - printk(KERN_DEBUG PFX "%d: group %d: 0x%lx\n", - pg_num, i, start); - ret = vm_insert_page(vma, start, pg); - if (ret) { - printk(KERN_DEBUG PFX - "vm_insert 2 failed at %d\n", pg_num); - return ret; - } - start += PAGE_SIZE; - } - } - - return 0; -} - -/* - * Check whether there is some group that the user space has not - * consumed yet. When the user space consumes a group, it sets it to - * -1. Cosuming could be reading data in case of RX and filling a - * buffer in case of TX. - */ -static int poch_channel_available(struct channel_info *channel) -{ - int available = 0; - - spin_lock_irq(&channel->group_offsets_lock); - - if (channel->consumed != channel->transfer) - available = 1; - - spin_unlock_irq(&channel->group_offsets_lock); - - return available; -} - -static unsigned int poch_poll(struct file *filp, poll_table *pt) -{ - struct channel_info *channel = filp->private_data; - unsigned int ret = 0; - - poll_wait(filp, &channel->wq, pt); - - if (poch_channel_available(channel)) { - if (channel->dir == CHANNEL_DIR_RX) - ret = POLLIN | POLLRDNORM; - else - ret = POLLOUT | POLLWRNORM; - } - - return ret; -} - -static int poch_ioctl(struct inode *inode, struct file *filp, - unsigned int cmd, unsigned long arg) -{ - struct channel_info *channel = filp->private_data; - void __iomem *fpga = channel->fpga_iomem; - void __iomem *bridge = channel->bridge_iomem; - void __user *argp = (void __user *)arg; - struct vm_area_struct *vms; - struct poch_counters counters; - int ret; - - switch (cmd) { - case POCH_IOC_TRANSFER_START: - switch (channel->chno) { - case CHNO_TX_CHANNEL: - printk(KERN_INFO PFX "ioctl: Tx start\n"); - iowrite32(0x1, fpga + FPGA_TX_TRIGGER_REG); - iowrite32(0x1, fpga + FPGA_TX_ENABLE_REG); - - /* FIXME: Does it make sense to do a DMA GO - * twice, once in Tx and once in Rx. - */ - iowrite32(0x1, bridge + BRIDGE_DMA_GO_REG); - break; - case CHNO_RX_CHANNEL: - printk(KERN_INFO PFX "ioctl: Rx start\n"); - iowrite32(0x1, fpga + FPGA_RX_ARM_REG); - iowrite32(0x1, bridge + BRIDGE_DMA_GO_REG); - break; - } - break; - case POCH_IOC_TRANSFER_STOP: - switch (channel->chno) { - case CHNO_TX_CHANNEL: - printk(KERN_INFO PFX "ioctl: Tx stop\n"); - iowrite32(0x0, fpga + FPGA_TX_ENABLE_REG); - iowrite32(0x0, fpga + FPGA_TX_TRIGGER_REG); - iowrite32(0x0, bridge + BRIDGE_DMA_GO_REG); - break; - case CHNO_RX_CHANNEL: - printk(KERN_INFO PFX "ioctl: Rx stop\n"); - iowrite32(0x0, fpga + FPGA_RX_ARM_REG); - iowrite32(0x0, bridge + BRIDGE_DMA_GO_REG); - break; - } - break; - case POCH_IOC_CONSUME: - { - int available; - int nfetch; - unsigned int from; - unsigned int count; - unsigned int i, j; - struct poch_consume consume; - struct poch_consume *uconsume; - - uconsume = argp; - ret = copy_from_user(&consume, uconsume, sizeof(consume)); - if (ret) - return ret; - - spin_lock_irq(&channel->group_offsets_lock); - - channel->consumed += consume.nflush; - channel->consumed %= channel->group_count; - - available = channel->transfer - channel->consumed; - if (available < 0) - available += channel->group_count; - - from = channel->consumed; - - spin_unlock_irq(&channel->group_offsets_lock); - - nfetch = consume.nfetch; - count = min(available, nfetch); - - for (i = 0; i < count; i++) { - j = (from + i) % channel->group_count; - ret = put_user(channel->groups[j].user_offset, - &consume.offsets[i]); - if (ret) - return -EFAULT; - } - - ret = put_user(count, &uconsume->nfetch); - if (ret) - return -EFAULT; - - break; - } - case POCH_IOC_GET_COUNTERS: - if (!access_ok(VERIFY_WRITE, argp, sizeof(struct poch_counters))) - return -EFAULT; - - spin_lock_irq(&channel->counters_lock); - counters = channel->counters; - __poch_channel_clear_counters(channel); - spin_unlock_irq(&channel->counters_lock); - - ret = copy_to_user(argp, &counters, - sizeof(struct poch_counters)); - if (ret) - return ret; - - break; - case POCH_IOC_SYNC_GROUP_FOR_USER: - case POCH_IOC_SYNC_GROUP_FOR_DEVICE: - vms = find_vma(current->mm, arg); - if (!vms) - /* Address not mapped. */ - return -EINVAL; - if (vms->vm_file != filp) - /* Address mapped from different device/file. */ - return -EINVAL; - - flush_cache_range(vms, arg, arg + channel->group_size); - break; - } - return 0; -} - -static struct file_operations poch_fops = { - .owner = THIS_MODULE, - .open = poch_open, - .release = poch_release, - .ioctl = poch_ioctl, - .poll = poch_poll, - .mmap = poch_mmap -}; - -static void poch_irq_dma(struct channel_info *channel) -{ - u32 prev_transfer; - u32 curr_transfer; - long groups_done; - unsigned long i, j; - struct poch_group_info *groups; - u32 curr_group_reg; - - if (!atomic_read(&channel->inited)) - return; - - prev_transfer = channel->transfer; - - if (channel->chno == CHNO_RX_CHANNEL) - curr_group_reg = FPGA_RX_CURR_GROUP_REG; - else - curr_group_reg = FPGA_TX_CURR_GROUP_REG; - - curr_transfer = ioread32(channel->fpga_iomem + curr_group_reg); - - groups_done = curr_transfer - prev_transfer; - /* Check wrap over, and handle it. */ - if (groups_done <= 0) - groups_done += channel->group_count; - - groups = channel->groups; - - spin_lock(&channel->group_offsets_lock); - - for (i = 0; i < groups_done; i++) { - j = (prev_transfer + i) % channel->group_count; - - channel->transfer += 1; - channel->transfer %= channel->group_count; - - if (channel->transfer == channel->consumed) { - channel->consumed += 1; - channel->consumed %= channel->group_count; - } - } - - spin_unlock(&channel->group_offsets_lock); - - wake_up_interruptible(&channel->wq); -} - -static irqreturn_t poch_irq_handler(int irq, void *p) -{ - struct poch_dev *poch_dev = p; - void __iomem *bridge = poch_dev->bridge_iomem; - void __iomem *fpga = poch_dev->fpga_iomem; - struct channel_info *channel_rx = &poch_dev->channels[CHNO_RX_CHANNEL]; - struct channel_info *channel_tx = &poch_dev->channels[CHNO_TX_CHANNEL]; - u32 bridge_stat; - u32 fpga_stat; - u32 dma_stat; - - bridge_stat = ioread32(bridge + BRIDGE_INT_STAT_REG); - fpga_stat = ioread32(fpga + FPGA_INT_STAT_REG); - dma_stat = ioread32(fpga + FPGA_DMA_INT_STAT_REG); - - ioread32(fpga + FPGA_DMA_INT_STAT_REG); - ioread32(fpga + FPGA_INT_STAT_REG); - ioread32(bridge + BRIDGE_INT_STAT_REG); - - if (bridge_stat & BRIDGE_INT_FPGA) { - if (fpga_stat & FPGA_INT_DMA_CORE) { - if (dma_stat & FPGA_DMA_INT_RX) - poch_irq_dma(channel_rx); - if (dma_stat & FPGA_DMA_INT_TX) - poch_irq_dma(channel_tx); - } - if (fpga_stat & FPGA_INT_PLL_UNLOCKED) { - channel_tx->counters.pll_unlock++; - channel_rx->counters.pll_unlock++; - if (printk_ratelimit()) - printk(KERN_WARNING PFX "PLL unlocked\n"); - } - if (fpga_stat & FPGA_INT_TX_FF_EMPTY) - channel_tx->counters.fifo_empty++; - if (fpga_stat & FPGA_INT_TX_FF_OVRFLW) - channel_tx->counters.fifo_overflow++; - if (fpga_stat & FPGA_INT_RX_FF_EMPTY) - channel_rx->counters.fifo_empty++; - if (fpga_stat & FPGA_INT_RX_FF_OVRFLW) - channel_rx->counters.fifo_overflow++; - - /* - * FIXME: These errors should be notified through the - * poll interface as POLLERR. - */ - - /* Re-enable interrupts. */ - iowrite32(BRIDGE_INT_FPGA, bridge + BRIDGE_INT_MASK_REG); - - return IRQ_HANDLED; - } - - return IRQ_NONE; -} - -static void poch_class_dev_unregister(struct poch_dev *poch_dev, int id) -{ - int i, j; - int nattrs; - struct channel_info *channel; - dev_t devno; - - if (poch_dev->dev == NULL) - return; - - for (i = 0; i < poch_dev->nchannels; i++) { - channel = &poch_dev->channels[i]; - devno = poch_first_dev + (id * poch_dev->nchannels) + i; - - if (!channel->dev) - continue; - - nattrs = sizeof(poch_class_attrs)/sizeof(poch_class_attrs[0]); - for (j = 0; j < nattrs; j++) - device_remove_file(channel->dev, poch_class_attrs[j]); - - device_unregister(channel->dev); - } - - device_unregister(poch_dev->dev); -} - -static int __devinit poch_class_dev_register(struct poch_dev *poch_dev, - int id) -{ - struct device *dev = &poch_dev->pci_dev->dev; - int i, j; - int nattrs; - int ret; - struct channel_info *channel; - dev_t devno; - - poch_dev->dev = device_create(poch_cls, &poch_dev->pci_dev->dev, - MKDEV(0, 0), NULL, "poch%d", id); - if (IS_ERR(poch_dev->dev)) { - dev_err(dev, "error creating parent class device"); - ret = PTR_ERR(poch_dev->dev); - poch_dev->dev = NULL; - return ret; - } - - for (i = 0; i < poch_dev->nchannels; i++) { - channel = &poch_dev->channels[i]; - - devno = poch_first_dev + (id * poch_dev->nchannels) + i; - channel->dev = device_create(poch_cls, poch_dev->dev, devno, - NULL, "ch%d", i); - if (IS_ERR(channel->dev)) { - dev_err(dev, "error creating channel class device"); - ret = PTR_ERR(channel->dev); - channel->dev = NULL; - poch_class_dev_unregister(poch_dev, id); - return ret; - } - - dev_set_drvdata(channel->dev, channel); - nattrs = sizeof(poch_class_attrs)/sizeof(poch_class_attrs[0]); - for (j = 0; j < nattrs; j++) { - ret = device_create_file(channel->dev, - poch_class_attrs[j]); - if (ret) { - dev_err(dev, "error creating attribute file"); - poch_class_dev_unregister(poch_dev, id); - return ret; - } - } - } - - return 0; -} - -static int __devinit poch_pci_probe(struct pci_dev *pdev, - const struct pci_device_id *pci_id) -{ - struct device *dev = &pdev->dev; - struct poch_dev *poch_dev; - struct uio_info *uio; - int ret; - int id; - int i; - - poch_dev = kzalloc(sizeof(struct poch_dev), GFP_KERNEL); - if (!poch_dev) { - dev_err(dev, "error allocating priv. data memory\n"); - return -ENOMEM; - } - - poch_dev->pci_dev = pdev; - uio = &poch_dev->uio; - - pci_set_drvdata(pdev, poch_dev); - - spin_lock_init(&poch_dev->iomem_lock); - - poch_dev->nchannels = POCH_NCHANNELS; - poch_dev->channels[CHNO_RX_CHANNEL].dir = CHANNEL_DIR_RX; - poch_dev->channels[CHNO_TX_CHANNEL].dir = CHANNEL_DIR_TX; - - for (i = 0; i < poch_dev->nchannels; i++) { - init_waitqueue_head(&poch_dev->channels[i].wq); - atomic_set(&poch_dev->channels[i].free, 1); - atomic_set(&poch_dev->channels[i].inited, 0); - } - - ret = pci_enable_device(pdev); - if (ret) { - dev_err(dev, "error enabling device\n"); - goto out_free; - } - - ret = pci_request_regions(pdev, "poch"); - if (ret) { - dev_err(dev, "error requesting resources\n"); - goto out_disable; - } - - uio->mem[0].addr = pci_resource_start(pdev, 1); - if (!uio->mem[0].addr) { - dev_err(dev, "invalid BAR1\n"); - ret = -ENODEV; - goto out_release; - } - - uio->mem[0].size = pci_resource_len(pdev, 1); - uio->mem[0].memtype = UIO_MEM_PHYS; - - uio->name = "poch"; - uio->version = "0.0.1"; - uio->irq = -1; - ret = uio_register_device(dev, uio); - if (ret) { - dev_err(dev, "error register UIO device: %d\n", ret); - goto out_release; - } - - poch_dev->bridge_iomem = ioremap(pci_resource_start(pdev, 0), - pci_resource_len(pdev, 0)); - if (poch_dev->bridge_iomem == NULL) { - dev_err(dev, "error mapping bridge (bar0) registers\n"); - ret = -ENOMEM; - goto out_uio_unreg; - } - - poch_dev->fpga_iomem = ioremap(pci_resource_start(pdev, 1), - pci_resource_len(pdev, 1)); - if (poch_dev->fpga_iomem == NULL) { - dev_err(dev, "error mapping fpga (bar1) registers\n"); - ret = -ENOMEM; - goto out_bar0_unmap; - } - - ret = request_irq(pdev->irq, poch_irq_handler, IRQF_SHARED, - dev_name(dev), poch_dev); - if (ret) { - dev_err(dev, "error requesting IRQ %u\n", pdev->irq); - ret = -ENOMEM; - goto out_bar1_unmap; - } - - if (!idr_pre_get(&poch_ids, GFP_KERNEL)) { - dev_err(dev, "error allocating memory ids\n"); - ret = -ENOMEM; - goto out_free_irq; - } - - idr_get_new(&poch_ids, poch_dev, &id); - if (id >= MAX_POCH_CARDS) { - dev_err(dev, "minors exhausted\n"); - ret = -EBUSY; - goto out_free_irq; - } - - cdev_init(&poch_dev->cdev, &poch_fops); - poch_dev->cdev.owner = THIS_MODULE; - ret = cdev_add(&poch_dev->cdev, - poch_first_dev + (id * poch_dev->nchannels), - poch_dev->nchannels); - if (ret) { - dev_err(dev, "error register character device\n"); - goto out_idr_remove; - } - - ret = poch_class_dev_register(poch_dev, id); - if (ret) - goto out_cdev_del; - - return 0; - - out_cdev_del: - cdev_del(&poch_dev->cdev); - out_idr_remove: - idr_remove(&poch_ids, id); - out_free_irq: - free_irq(pdev->irq, poch_dev); - out_bar1_unmap: - iounmap(poch_dev->fpga_iomem); - out_bar0_unmap: - iounmap(poch_dev->bridge_iomem); - out_uio_unreg: - uio_unregister_device(uio); - out_release: - pci_release_regions(pdev); - out_disable: - pci_disable_device(pdev); - out_free: - kfree(poch_dev); - return ret; -} - -/* - * FIXME: We are yet to handle the hot unplug case. - */ -static void poch_pci_remove(struct pci_dev *pdev) -{ - struct poch_dev *poch_dev = pci_get_drvdata(pdev); - struct uio_info *uio = &poch_dev->uio; - unsigned int minor = MINOR(poch_dev->cdev.dev); - unsigned int id = minor / poch_dev->nchannels; - - poch_class_dev_unregister(poch_dev, id); - cdev_del(&poch_dev->cdev); - idr_remove(&poch_ids, id); - free_irq(pdev->irq, poch_dev); - iounmap(poch_dev->fpga_iomem); - iounmap(poch_dev->bridge_iomem); - uio_unregister_device(uio); - pci_release_regions(pdev); - pci_disable_device(pdev); - pci_set_drvdata(pdev, NULL); - iounmap(uio->mem[0].internal_addr); - - kfree(poch_dev); -} - -static const struct pci_device_id poch_pci_ids[] /* __devinitconst */ = { - { PCI_DEVICE(PCI_VENDOR_ID_RRAPIDS, - PCI_DEVICE_ID_RRAPIDS_POCKET_CHANGE) }, - { 0, } -}; - -static struct pci_driver poch_pci_driver = { - .name = DRV_NAME, - .id_table = poch_pci_ids, - .probe = poch_pci_probe, - .remove = poch_pci_remove, -}; - -static int __init poch_init_module(void) -{ - int ret = 0; - - ret = alloc_chrdev_region(&poch_first_dev, 0, - MAX_POCH_DEVICES, DRV_NAME); - if (ret) { - printk(KERN_ERR PFX "error allocating device no."); - return ret; - } - - poch_cls = class_create(THIS_MODULE, "pocketchange"); - if (IS_ERR(poch_cls)) { - ret = PTR_ERR(poch_cls); - goto out_unreg_chrdev; - } - - ret = pci_register_driver(&poch_pci_driver); - if (ret) { - printk(KERN_ERR PFX "error register PCI device"); - goto out_class_destroy; - } - - return 0; - - out_class_destroy: - class_destroy(poch_cls); - - out_unreg_chrdev: - unregister_chrdev_region(poch_first_dev, MAX_POCH_DEVICES); - - return ret; -} - -static void __exit poch_exit_module(void) -{ - pci_unregister_driver(&poch_pci_driver); - class_destroy(poch_cls); - unregister_chrdev_region(poch_first_dev, MAX_POCH_DEVICES); -} - -module_init(poch_init_module); -module_exit(poch_exit_module); - -MODULE_LICENSE("GPL v2"); |