diff options
Diffstat (limited to 'drivers/dma/ste_dma40.c')
| -rw-r--r-- | drivers/dma/ste_dma40.c | 2596 |
1 files changed, 2596 insertions, 0 deletions
diff --git a/drivers/dma/ste_dma40.c b/drivers/dma/ste_dma40.c new file mode 100644 index 000000000000..e4295a27672b --- /dev/null +++ b/drivers/dma/ste_dma40.c @@ -0,0 +1,2596 @@ +/* + * driver/dma/ste_dma40.c + * + * Copyright (C) ST-Ericsson 2007-2010 + * License terms: GNU General Public License (GPL) version 2 + * Author: Per Friden <per.friden@stericsson.com> + * Author: Jonas Aaberg <jonas.aberg@stericsson.com> + * + */ + +#include <linux/kernel.h> +#include <linux/slab.h> +#include <linux/dmaengine.h> +#include <linux/platform_device.h> +#include <linux/clk.h> +#include <linux/delay.h> + +#include <plat/ste_dma40.h> + +#include "ste_dma40_ll.h" + +#define D40_NAME "dma40" + +#define D40_PHY_CHAN -1 + +/* For masking out/in 2 bit channel positions */ +#define D40_CHAN_POS(chan) (2 * (chan / 2)) +#define D40_CHAN_POS_MASK(chan) (0x3 << D40_CHAN_POS(chan)) + +/* Maximum iterations taken before giving up suspending a channel */ +#define D40_SUSPEND_MAX_IT 500 + +#define D40_ALLOC_FREE (1 << 31) +#define D40_ALLOC_PHY (1 << 30) +#define D40_ALLOC_LOG_FREE 0 + +/* The number of free d40_desc to keep in memory before starting + * to kfree() them */ +#define D40_DESC_CACHE_SIZE 50 + +/* Hardware designer of the block */ +#define D40_PERIPHID2_DESIGNER 0x8 + +/** + * enum 40_command - The different commands and/or statuses. + * + * @D40_DMA_STOP: DMA channel command STOP or status STOPPED, + * @D40_DMA_RUN: The DMA channel is RUNNING of the command RUN. + * @D40_DMA_SUSPEND_REQ: Request the DMA to SUSPEND as soon as possible. + * @D40_DMA_SUSPENDED: The DMA channel is SUSPENDED. + */ +enum d40_command { + D40_DMA_STOP = 0, + D40_DMA_RUN = 1, + D40_DMA_SUSPEND_REQ = 2, + D40_DMA_SUSPENDED = 3 +}; + +/** + * struct d40_lli_pool - Structure for keeping LLIs in memory + * + * @base: Pointer to memory area when the pre_alloc_lli's are not large + * enough, IE bigger than the most common case, 1 dst and 1 src. NULL if + * pre_alloc_lli is used. + * @size: The size in bytes of the memory at base or the size of pre_alloc_lli. + * @pre_alloc_lli: Pre allocated area for the most common case of transfers, + * one buffer to one buffer. + */ +struct d40_lli_pool { + void *base; + int size; + /* Space for dst and src, plus an extra for padding */ + u8 pre_alloc_lli[3 * sizeof(struct d40_phy_lli)]; +}; + +/** + * struct d40_desc - A descriptor is one DMA job. + * + * @lli_phy: LLI settings for physical channel. Both src and dst= + * points into the lli_pool, to base if lli_len > 1 or to pre_alloc_lli if + * lli_len equals one. + * @lli_log: Same as above but for logical channels. + * @lli_pool: The pool with two entries pre-allocated. + * @lli_len: Number of LLI's in lli_pool + * @lli_tcount: Number of LLIs processed in the transfer. When equals lli_len + * then this transfer job is done. + * @txd: DMA engine struct. Used for among other things for communication + * during a transfer. + * @node: List entry. + * @dir: The transfer direction of this job. + * @is_in_client_list: true if the client owns this descriptor. + * + * This descriptor is used for both logical and physical transfers. + */ + +struct d40_desc { + /* LLI physical */ + struct d40_phy_lli_bidir lli_phy; + /* LLI logical */ + struct d40_log_lli_bidir lli_log; + + struct d40_lli_pool lli_pool; + u32 lli_len; + u32 lli_tcount; + + struct dma_async_tx_descriptor txd; + struct list_head node; + + enum dma_data_direction dir; + bool is_in_client_list; +}; + +/** + * struct d40_lcla_pool - LCLA pool settings and data. + * + * @base: The virtual address of LCLA. + * @phy: Physical base address of LCLA. + * @base_size: size of lcla. + * @lock: Lock to protect the content in this struct. + * @alloc_map: Mapping between physical channel and LCLA entries. + * @num_blocks: The number of entries of alloc_map. Equals to the + * number of physical channels. + */ +struct d40_lcla_pool { + void *base; + dma_addr_t phy; + resource_size_t base_size; + spinlock_t lock; + u32 *alloc_map; + int num_blocks; +}; + +/** + * struct d40_phy_res - struct for handling eventlines mapped to physical + * channels. + * + * @lock: A lock protection this entity. + * @num: The physical channel number of this entity. + * @allocated_src: Bit mapped to show which src event line's are mapped to + * this physical channel. Can also be free or physically allocated. + * @allocated_dst: Same as for src but is dst. + * allocated_dst and allocated_src uses the D40_ALLOC* defines as well as + * event line number. Both allocated_src and allocated_dst can not be + * allocated to a physical channel, since the interrupt handler has then + * no way of figure out which one the interrupt belongs to. + */ +struct d40_phy_res { + spinlock_t lock; + int num; + u32 allocated_src; + u32 allocated_dst; +}; + +struct d40_base; + +/** + * struct d40_chan - Struct that describes a channel. + * + * @lock: A spinlock to protect this struct. + * @log_num: The logical number, if any of this channel. + * @completed: Starts with 1, after first interrupt it is set to dma engine's + * current cookie. + * @pending_tx: The number of pending transfers. Used between interrupt handler + * and tasklet. + * @busy: Set to true when transfer is ongoing on this channel. + * @phy_chan: Pointer to physical channel which this instance runs on. + * @chan: DMA engine handle. + * @tasklet: Tasklet that gets scheduled from interrupt context to complete a + * transfer and call client callback. + * @client: Cliented owned descriptor list. + * @active: Active descriptor. + * @queue: Queued jobs. + * @free: List of free descripts, ready to be reused. + * @free_len: Number of descriptors in the free list. + * @dma_cfg: The client configuration of this dma channel. + * @base: Pointer to the device instance struct. + * @src_def_cfg: Default cfg register setting for src. + * @dst_def_cfg: Default cfg register setting for dst. + * @log_def: Default logical channel settings. + * @lcla: Space for one dst src pair for logical channel transfers. + * @lcpa: Pointer to dst and src lcpa settings. + * + * This struct can either "be" a logical or a physical channel. + */ +struct d40_chan { + spinlock_t lock; + int log_num; + /* ID of the most recent completed transfer */ + int completed; + int pending_tx; + bool busy; + struct d40_phy_res *phy_chan; + struct dma_chan chan; + struct tasklet_struct tasklet; + struct list_head client; + struct list_head active; + struct list_head queue; + struct list_head free; + int free_len; + struct stedma40_chan_cfg dma_cfg; + struct d40_base *base; + /* Default register configurations */ + u32 src_def_cfg; + u32 dst_def_cfg; + struct d40_def_lcsp log_def; + struct d40_lcla_elem lcla; + struct d40_log_lli_full *lcpa; +}; + +/** + * struct d40_base - The big global struct, one for each probe'd instance. + * + * @interrupt_lock: Lock used to make sure one interrupt is handle a time. + * @execmd_lock: Lock for execute command usage since several channels share + * the same physical register. + * @dev: The device structure. + * @virtbase: The virtual base address of the DMA's register. + * @clk: Pointer to the DMA clock structure. + * @phy_start: Physical memory start of the DMA registers. + * @phy_size: Size of the DMA register map. + * @irq: The IRQ number. + * @num_phy_chans: The number of physical channels. Read from HW. This + * is the number of available channels for this driver, not counting "Secure + * mode" allocated physical channels. + * @num_log_chans: The number of logical channels. Calculated from + * num_phy_chans. + * @dma_both: dma_device channels that can do both memcpy and slave transfers. + * @dma_slave: dma_device channels that can do only do slave transfers. + * @dma_memcpy: dma_device channels that can do only do memcpy transfers. + * @phy_chans: Room for all possible physical channels in system. + * @log_chans: Room for all possible logical channels in system. + * @lookup_log_chans: Used to map interrupt number to logical channel. Points + * to log_chans entries. + * @lookup_phy_chans: Used to map interrupt number to physical channel. Points + * to phy_chans entries. + * @plat_data: Pointer to provided platform_data which is the driver + * configuration. + * @phy_res: Vector containing all physical channels. + * @lcla_pool: lcla pool settings and data. + * @lcpa_base: The virtual mapped address of LCPA. + * @phy_lcpa: The physical address of the LCPA. + * @lcpa_size: The size of the LCPA area. + */ +struct d40_base { + spinlock_t interrupt_lock; + spinlock_t execmd_lock; + struct device *dev; + void __iomem *virtbase; + struct clk *clk; + phys_addr_t phy_start; + resource_size_t phy_size; + int irq; + int num_phy_chans; + int num_log_chans; + struct dma_device dma_both; + struct dma_device dma_slave; + struct dma_device dma_memcpy; + struct d40_chan *phy_chans; + struct d40_chan *log_chans; + struct d40_chan **lookup_log_chans; + struct d40_chan **lookup_phy_chans; + struct stedma40_platform_data *plat_data; + /* Physical half channels */ + struct d40_phy_res *phy_res; + struct d40_lcla_pool lcla_pool; + void *lcpa_base; + dma_addr_t phy_lcpa; + resource_size_t lcpa_size; +}; + +/** + * struct d40_interrupt_lookup - lookup table for interrupt handler + * + * @src: Interrupt mask register. + * @clr: Interrupt clear register. + * @is_error: true if this is an error interrupt. + * @offset: start delta in the lookup_log_chans in d40_base. If equals to + * D40_PHY_CHAN, the lookup_phy_chans shall be used instead. + */ +struct d40_interrupt_lookup { + u32 src; + u32 clr; + bool is_error; + int offset; +}; + +/** + * struct d40_reg_val - simple lookup struct + * + * @reg: The register. + * @val: The value that belongs to the register in reg. + */ +struct d40_reg_val { + unsigned int reg; + unsigned int val; +}; + +static int d40_pool_lli_alloc(struct d40_desc *d40d, + int lli_len, bool is_log) +{ + u32 align; + void *base; + + if (is_log) + align = sizeof(struct d40_log_lli); + else + align = sizeof(struct d40_phy_lli); + + if (lli_len == 1) { + base = d40d->lli_pool.pre_alloc_lli; + d40d->lli_pool.size = sizeof(d40d->lli_pool.pre_alloc_lli); + d40d->lli_pool.base = NULL; + } else { + d40d->lli_pool.size = ALIGN(lli_len * 2 * align, align); + + base = kmalloc(d40d->lli_pool.size + align, GFP_NOWAIT); + d40d->lli_pool.base = base; + + if (d40d->lli_pool.base == NULL) + return -ENOMEM; + } + + if (is_log) { + d40d->lli_log.src = PTR_ALIGN((struct d40_log_lli *) base, + align); + d40d->lli_log.dst = PTR_ALIGN(d40d->lli_log.src + lli_len, + align); + } else { + d40d->lli_phy.src = PTR_ALIGN((struct d40_phy_lli *)base, + align); + d40d->lli_phy.dst = PTR_ALIGN(d40d->lli_phy.src + lli_len, + align); + + d40d->lli_phy.src_addr = virt_to_phys(d40d->lli_phy.src); + d40d->lli_phy.dst_addr = virt_to_phys(d40d->lli_phy.dst); + } + + return 0; +} + +static void d40_pool_lli_free(struct d40_desc *d40d) +{ + kfree(d40d->lli_pool.base); + d40d->lli_pool.base = NULL; + d40d->lli_pool.size = 0; + d40d->lli_log.src = NULL; + d40d->lli_log.dst = NULL; + d40d->lli_phy.src = NULL; + d40d->lli_phy.dst = NULL; + d40d->lli_phy.src_addr = 0; + d40d->lli_phy.dst_addr = 0; +} + +static dma_cookie_t d40_assign_cookie(struct d40_chan *d40c, + struct d40_desc *desc) +{ + dma_cookie_t cookie = d40c->chan.cookie; + + if (++cookie < 0) + cookie = 1; + + d40c->chan.cookie = cookie; + desc->txd.cookie = cookie; + + return cookie; +} + +static void d40_desc_reset(struct d40_desc *d40d) +{ + d40d->lli_tcount = 0; +} + +static void d40_desc_remove(struct d40_desc *d40d) +{ + list_del(&d40d->node); +} + +static struct d40_desc *d40_desc_get(struct d40_chan *d40c) +{ + struct d40_desc *desc; + struct d40_desc *d; + struct d40_desc *_d; + + if (!list_empty(&d40c->client)) { + list_for_each_entry_safe(d, _d, &d40c->client, node) + if (async_tx_test_ack(&d->txd)) { + d40_pool_lli_free(d); + d40_desc_remove(d); + desc = d; + goto out; + } + } + + if (list_empty(&d40c->free)) { + /* Alloc new desc because we're out of used ones */ + desc = kzalloc(sizeof(struct d40_desc), GFP_NOWAIT); + if (desc == NULL) + goto out; + INIT_LIST_HEAD(&desc->node); + } else { + /* Reuse an old desc. */ + desc = list_first_entry(&d40c->free, + struct d40_desc, + node); + list_del(&desc->node); + d40c->free_len--; + } +out: + return desc; +} + +static void d40_desc_free(struct d40_chan *d40c, struct d40_desc *d40d) +{ + if (d40c->free_len < D40_DESC_CACHE_SIZE) { + list_add_tail(&d40d->node, &d40c->free); + d40c->free_len++; + } else + kfree(d40d); +} + +static void d40_desc_submit(struct d40_chan *d40c, struct d40_desc *desc) +{ + list_add_tail(&desc->node, &d40c->active); +} + +static struct d40_desc *d40_first_active_get(struct d40_chan *d40c) +{ + struct d40_desc *d; + + if (list_empty(&d40c->active)) + return NULL; + + d = list_first_entry(&d40c->active, + struct d40_desc, + node); + return d; +} + +static void d40_desc_queue(struct d40_chan *d40c, struct d40_desc *desc) +{ + list_add_tail(&desc->node, &d40c->queue); +} + +static struct d40_desc *d40_first_queued(struct d40_chan *d40c) +{ + struct d40_desc *d; + + if (list_empty(&d40c->queue)) + return NULL; + + d = list_first_entry(&d40c->queue, + struct d40_desc, + node); + return d; +} + +/* Support functions for logical channels */ + +static int d40_lcla_id_get(struct d40_chan *d40c, + struct d40_lcla_pool *pool) +{ + int src_id = 0; + int dst_id = 0; + struct d40_log_lli *lcla_lidx_base = + pool->base + d40c->phy_chan->num * 1024; + int i; + int lli_per_log = d40c->base->plat_data->llis_per_log; + + if (d40c->lcla.src_id >= 0 && d40c->lcla.dst_id >= 0) + return 0; + + if (pool->num_blocks > 32) + return -EINVAL; + + spin_lock(&pool->lock); + + for (i = 0; i < pool->num_blocks; i++) { + if (!(pool->alloc_map[d40c->phy_chan->num] & (0x1 << i))) { + pool->alloc_map[d40c->phy_chan->num] |= (0x1 << i); + break; + } + } + src_id = i; + if (src_id >= pool->num_blocks) + goto err; + + for (; i < pool->num_blocks; i++) { + if (!(pool->alloc_map[d40c->phy_chan->num] & (0x1 << i))) { + pool->alloc_map[d40c->phy_chan->num] |= (0x1 << i); + break; + } + } + + dst_id = i; + if (dst_id == src_id) + goto err; + + d40c->lcla.src_id = src_id; + d40c->lcla.dst_id = dst_id; + d40c->lcla.dst = lcla_lidx_base + dst_id * lli_per_log + 1; + d40c->lcla.src = lcla_lidx_base + src_id * lli_per_log + 1; + + + spin_unlock(&pool->lock); + return 0; +err: + spin_unlock(&pool->lock); + return -EINVAL; +} + +static void d40_lcla_id_put(struct d40_chan *d40c, + struct d40_lcla_pool *pool, + int id) +{ + if (id < 0) + return; + + d40c->lcla.src_id = -1; + d40c->lcla.dst_id = -1; + + spin_lock(&pool->lock); + pool->alloc_map[d40c->phy_chan->num] &= (~(0x1 << id)); + spin_unlock(&pool->lock); +} + +static int d40_channel_execute_command(struct d40_chan *d40c, + enum d40_command command) +{ + int status, i; + void __iomem *active_reg; + int ret = 0; + unsigned long flags; + + spin_lock_irqsave(&d40c->base->execmd_lock, flags); + + if (d40c->phy_chan->num % 2 == 0) + active_reg = d40c->base->virtbase + D40_DREG_ACTIVE; + else + active_reg = d40c->base->virtbase + D40_DREG_ACTIVO; + + if (command == D40_DMA_SUSPEND_REQ) { + status = (readl(active_reg) & + D40_CHAN_POS_MASK(d40c->phy_chan->num)) >> + D40_CHAN_POS(d40c->phy_chan->num); + + if (status == D40_DMA_SUSPENDED || status == D40_DMA_STOP) + goto done; + } + + writel(command << D40_CHAN_POS(d40c->phy_chan->num), active_reg); + + if (command == D40_DMA_SUSPEND_REQ) { + + for (i = 0 ; i < D40_SUSPEND_MAX_IT; i++) { + status = (readl(active_reg) & + D40_CHAN_POS_MASK(d40c->phy_chan->num)) >> + D40_CHAN_POS(d40c->phy_chan->num); + + cpu_relax(); + /* + * Reduce the number of bus accesses while + * waiting for the DMA to suspend. + */ + udelay(3); + + if (status == D40_DMA_STOP || + status == D40_DMA_SUSPENDED) + break; + } + + if (i == D40_SUSPEND_MAX_IT) { + dev_err(&d40c->chan.dev->device, + "[%s]: unable to suspend the chl %d (log: %d) status %x\n", + __func__, d40c->phy_chan->num, d40c->log_num, + status); + dump_stack(); + ret = -EBUSY; + } + + } +done: + spin_unlock_irqrestore(&d40c->base->execmd_lock, flags); + return ret; +} + +static void d40_term_all(struct d40_chan *d40c) +{ + struct d40_desc *d40d; + struct d40_desc *d; + struct d40_desc *_d; + + /* Release active descriptors */ + while ((d40d = d40_first_active_get(d40c))) { + d40_desc_remove(d40d); + + /* Return desc to free-list */ + d40_desc_free(d40c, d40d); + } + + /* Release queued descriptors waiting for transfer */ + while ((d40d = d40_first_queued(d40c))) { + d40_desc_remove(d40d); + + /* Return desc to free-list */ + d40_desc_free(d40c, d40d); + } + + /* Release client owned descriptors */ + if (!list_empty(&d40c->client)) + list_for_each_entry_safe(d, _d, &d40c->client, node) { + d40_pool_lli_free(d); + d40_desc_remove(d); + /* Return desc to free-list */ + d40_desc_free(d40c, d40d); + } + + d40_lcla_id_put(d40c, &d40c->base->lcla_pool, + d40c->lcla.src_id); + d40_lcla_id_put(d40c, &d40c->base->lcla_pool, + d40c->lcla.dst_id); + + d40c->pending_tx = 0; + d40c->busy = false; +} + +static void d40_config_set_event(struct d40_chan *d40c, bool do_enable) +{ + u32 val; + unsigned long flags; + + if (do_enable) + val = D40_ACTIVATE_EVENTLINE; + else + val = D40_DEACTIVATE_EVENTLINE; + + spin_lock_irqsave(&d40c->phy_chan->lock, flags); + + /* Enable event line connected to device (or memcpy) */ + if ((d40c->dma_cfg.dir == STEDMA40_PERIPH_TO_MEM) || + (d40c->dma_cfg.dir == STEDMA40_PERIPH_TO_PERIPH)) { + u32 event = D40_TYPE_TO_EVENT(d40c->dma_cfg.src_dev_type); + + writel((val << D40_EVENTLINE_POS(event)) | + ~D40_EVENTLINE_MASK(event), + d40c->base->virtbase + D40_DREG_PCBASE + + d40c->phy_chan->num * D40_DREG_PCDELTA + + D40_CHAN_REG_SSLNK); + } + if (d40c->dma_cfg.dir != STEDMA40_PERIPH_TO_MEM) { + u32 event = D40_TYPE_TO_EVENT(d40c->dma_cfg.dst_dev_type); + + writel((val << D40_EVENTLINE_POS(event)) | + ~D40_EVENTLINE_MASK(event), + d40c->base->virtbase + D40_DREG_PCBASE + + d40c->phy_chan->num * D40_DREG_PCDELTA + + D40_CHAN_REG_SDLNK); + } + + spin_unlock_irqrestore(&d40c->phy_chan->lock, flags); +} + +static bool d40_chan_has_events(struct d40_chan *d40c) +{ + u32 val = 0; + + /* If SSLNK or SDLNK is zero all events are disabled */ + if ((d40c->dma_cfg.dir == STEDMA40_PERIPH_TO_MEM) || + (d40c->dma_cfg.dir == STEDMA40_PERIPH_TO_PERIPH)) + val = readl(d40c->base->virtbase + D40_DREG_PCBASE + + d40c->phy_chan->num * D40_DREG_PCDELTA + + D40_CHAN_REG_SSLNK); + + if (d40c->dma_cfg.dir != STEDMA40_PERIPH_TO_MEM) + val = readl(d40c->base->virtbase + D40_DREG_PCBASE + + d40c->phy_chan->num * D40_DREG_PCDELTA + + D40_CHAN_REG_SDLNK); + return (bool) val; +} + +static void d40_config_enable_lidx(struct d40_chan *d40c) +{ + /* Set LIDX for lcla */ + writel((d40c->phy_chan->num << D40_SREG_ELEM_LOG_LIDX_POS) & + D40_SREG_ELEM_LOG_LIDX_MASK, + d40c->base->virtbase + D40_DREG_PCBASE + + d40c->phy_chan->num * D40_DREG_PCDELTA + D40_CHAN_REG_SDELT); + + writel((d40c->phy_chan->num << D40_SREG_ELEM_LOG_LIDX_POS) & + D40_SREG_ELEM_LOG_LIDX_MASK, + d40c->base->virtbase + D40_DREG_PCBASE + + d40c->phy_chan->num * D40_DREG_PCDELTA + D40_CHAN_REG_SSELT); +} + +static int d40_config_write(struct d40_chan *d40c) +{ + u32 addr_base; + u32 var; + int res; + + res = d40_channel_execute_command(d40c, D40_DMA_SUSPEND_REQ); + if (res) + return res; + + /* Odd addresses are even addresses + 4 */ + addr_base = (d40c->phy_chan->num % 2) * 4; + /* Setup channel mode to logical or physical */ + var = ((u32)(d40c->log_num != D40_PHY_CHAN) + 1) << + D40_CHAN_POS(d40c->phy_chan->num); + writel(var, d40c->base->virtbase + D40_DREG_PRMSE + addr_base); + + /* Setup operational mode option register */ + var = ((d40c->dma_cfg.channel_type >> STEDMA40_INFO_CH_MODE_OPT_POS) & + 0x3) << D40_CHAN_POS(d40c->phy_chan->num); + + writel(var, d40c->base->virtbase + D40_DREG_PRMOE + addr_base); + + if (d40c->log_num != D40_PHY_CHAN) { + /* Set default config for CFG reg */ + writel(d40c->src_def_cfg, + d40c->base->virtbase + D40_DREG_PCBASE + + d40c->phy_chan->num * D40_DREG_PCDELTA + + D40_CHAN_REG_SSCFG); + writel(d40c->dst_def_cfg, + d40c->base->virtbase + D40_DREG_PCBASE + + d40c->phy_chan->num * D40_DREG_PCDELTA + + D40_CHAN_REG_SDCFG); + + d40_config_enable_lidx(d40c); + } + return res; +} + +static void d40_desc_load(struct d40_chan *d40c, struct d40_desc *d40d) +{ + + if (d40d->lli_phy.dst && d40d->lli_phy.src) { + d40_phy_lli_write(d40c->base->virtbase, + d40c->phy_chan->num, + d40d->lli_phy.dst, + d40d->lli_phy.src); + d40d->lli_tcount = d40d->lli_len; + } else if (d40d->lli_log.dst && d40d->lli_log.src) { + u32 lli_len; + struct d40_log_lli *src = d40d->lli_log.src; + struct d40_log_lli *dst = d40d->lli_log.dst; + + src += d40d->lli_tcount; + dst += d40d->lli_tcount; + + if (d40d->lli_len <= d40c->base->plat_data->llis_per_log) + lli_len = d40d->lli_len; + else + lli_len = d40c->base->plat_data->llis_per_log; + d40d->lli_tcount += lli_len; + d40_log_lli_write(d40c->lcpa, d40c->lcla.src, + d40c->lcla.dst, + dst, src, + d40c->base->plat_data->llis_per_log); + } +} + +static dma_cookie_t d40_tx_submit(struct dma_async_tx_descriptor *tx) +{ + struct d40_chan *d40c = container_of(tx->chan, + struct d40_chan, + chan); + struct d40_desc *d40d = container_of(tx, struct d40_desc, txd); + unsigned long flags; + + spin_lock_irqsave(&d40c->lock, flags); + + tx->cookie = d40_assign_cookie(d40c, d40d); + + d40_desc_queue(d40c, d40d); + + spin_unlock_irqrestore(&d40c->lock, flags); + + return tx->cookie; +} + +static int d40_start(struct d40_chan *d40c) +{ + int err; + + if (d40c->log_num != D40_PHY_CHAN) { + err = d40_channel_execute_command(d40c, D40_DMA_SUSPEND_REQ); + if (err) + return err; + d40_config_set_event(d40c, true); + } + + err = d40_channel_execute_command(d40c, D40_DMA_RUN); + + return err; +} + +static struct d40_desc *d40_queue_start(struct d40_chan *d40c) +{ + struct d40_desc *d40d; + int err; + + /* Start queued jobs, if any */ + d40d = d40_first_queued(d40c); + + if (d40d != NULL) { + d40c->busy = true; + + /* Remove from queue */ + d40_desc_remove(d40d); + + /* Add to active queue */ + d40_desc_submit(d40c, d40d); + + /* Initiate DMA job */ + d40_desc_load(d40c, d40d); + + /* Start dma job */ + err = d40_start(d40c); + + if (err) + return NULL; + } + + return d40d; +} + +/* called from interrupt context */ +static void dma_tc_handle(struct d40_chan *d40c) +{ + struct d40_desc *d40d; + + if (!d40c->phy_chan) + return; + + /* Get first active entry from list */ + d40d = d40_first_active_get(d40c); + + if (d40d == NULL) + return; + + if (d40d->lli_tcount < d40d->lli_len) { + + d40_desc_load(d40c, d40d); + /* Start dma job */ + (void) d40_start(d40c); + return; + } + + if (d40_queue_start(d40c) == NULL) + d40c->busy = false; + + d40c->pending_tx++; + tasklet_schedule(&d40c->tasklet); + +} + +static void dma_tasklet(unsigned long data) +{ + struct d40_chan *d40c = (struct d40_chan *) data; + struct d40_desc *d40d_fin; + unsigned long flags; + dma_async_tx_callback callback; + void *callback_param; + + spin_lock_irqsave(&d40c->lock, flags); + + /* Get first active entry from list */ + d40d_fin = d40_first_active_get(d40c); + + if (d40d_fin == NULL) + goto err; + + d40c->completed = d40d_fin->txd.cookie; + + /* + * If terminating a channel pending_tx is set to zero. + * This prevents any finished active jobs to return to the client. + */ + if (d40c->pending_tx == 0) { + spin_unlock_irqrestore(&d40c->lock, flags); + return; + } + + /* Callback to client */ + callback = d40d_fin->txd.callback; + callback_param = d40d_fin->txd.callback_param; + + if (async_tx_test_ack(&d40d_fin->txd)) { + d40_pool_lli_free(d40d_fin); + d40_desc_remove(d40d_fin); + /* Return desc to free-list */ + d40_desc_free(d40c, d40d_fin); + } else { + d40_desc_reset(d40d_fin); + if (!d40d_fin->is_in_client_list) { + d40_desc_remove(d40d_fin); + list_add_tail(&d40d_fin->node, &d40c->client); + d40d_fin->is_in_client_list = true; + } + } + + d40c->pending_tx--; + + if (d40c->pending_tx) + tasklet_schedule(&d40c->tasklet); + + spin_unlock_irqrestore(&d40c->lock, flags); + + if (callback) + callback(callback_param); + + return; + + err: + /* Rescue manouver if receiving double interrupts */ + if (d40c->pending_tx > 0) + d40c->pending_tx--; + spin_unlock_irqrestore(&d40c->lock, flags); +} + +static irqreturn_t d40_handle_interrupt(int irq, void *data) +{ + static const struct d40_interrupt_lookup il[] = { + {D40_DREG_LCTIS0, D40_DREG_LCICR0, false, 0}, + {D40_DREG_LCTIS1, D40_DREG_LCICR1, false, 32}, + {D40_DREG_LCTIS2, D40_DREG_LCICR2, false, 64}, + {D40_DREG_LCTIS3, D40_DREG_LCICR3, false, 96}, + {D40_DREG_LCEIS0, D40_DREG_LCICR0, true, 0}, + {D40_DREG_LCEIS1, D40_DREG_LCICR1, true, 32}, + {D40_DREG_LCEIS2, D40_DREG_LCICR2, true, 64}, + {D40_DREG_LCEIS3, D40_DREG_LCICR3, true, 96}, + {D40_DREG_PCTIS, D40_DREG_PCICR, false, D40_PHY_CHAN}, + {D40_DREG_PCEIS, D40_DREG_PCICR, true, D40_PHY_CHAN}, + }; + + int i; + u32 regs[ARRAY_SIZE(il)]; + u32 tmp; + u32 idx; + u32 row; + long chan = -1; + struct d40_chan *d40c; + unsigned long flags; + struct d40_base *base = data; + + spin_lock_irqsave(&base->interrupt_lock, flags); + + /* Read interrupt status of both logical and physical channels */ + for (i = 0; i < ARRAY_SIZE(il); i++) + regs[i] = readl(base->virtbase + il[i].src); + + for (;;) { + + chan = find_next_bit((unsigned long *)regs, + BITS_PER_LONG * ARRAY_SIZE(il), chan + 1); + + /* No more set bits found? */ + if (chan == BITS_PER_LONG * ARRAY_SIZE(il)) + break; + + row = chan / BITS_PER_LONG; + idx = chan & (BITS_PER_LONG - 1); + + /* ACK interrupt */ + tmp = readl(base->virtbase + il[row].clr); + tmp |= 1 << idx; + writel(tmp, base->virtbase + il[row].clr); + + if (il[row].offset == D40_PHY_CHAN) + d40c = base->lookup_phy_chans[idx]; + else + d40c = base->lookup_log_chans[il[row].offset + idx]; + spin_lock(&d40c->lock); + + if (!il[row].is_error) + dma_tc_handle(d40c); + else + dev_err(base->dev, "[%s] IRQ chan: %ld offset %d idx %d\n", + __func__, chan, il[row].offset, idx); + + spin_unlock(&d40c->lock); + } + + spin_unlock_irqrestore(&base->interrupt_lock, flags); + + return IRQ_HANDLED; +} + + +static int d40_validate_conf(struct d40_chan *d40c, + struct stedma40_chan_cfg *conf) +{ + int res = 0; + u32 dst_event_group = D40_TYPE_TO_GROUP(conf->dst_dev_type); + u32 src_event_group = D40_TYPE_TO_GROUP(conf->src_dev_type); + bool is_log = (conf->channel_type & STEDMA40_CHANNEL_IN_OPER_MODE) + == STEDMA40_CHANNEL_IN_LOG_MODE; + + if (d40c->dma_cfg.dir == STEDMA40_MEM_TO_PERIPH && + dst_event_group == STEDMA40_DEV_DST_MEMORY) { + dev_err(&d40c->chan.dev->device, "[%s] Invalid dst\n", + __func__); + res = -EINVAL; + } + + if (d40c->dma_cfg.dir == STEDMA40_PERIPH_TO_MEM && + src_event_group == STEDMA40_DEV_SRC_MEMORY) { + dev_err(&d40c->chan.dev->device, "[%s] Invalid src\n", + __func__); + res = -EINVAL; + } + + if (src_event_group == STEDMA40_DEV_SRC_MEMORY && + dst_event_group == STEDMA40_DEV_DST_MEMORY && is_log) { + dev_err(&d40c->chan.dev->device, + "[%s] No event line\n", __func__); + res = -EINVAL; + } + + if (conf->dir == STEDMA40_PERIPH_TO_PERIPH && + (src_event_group != dst_event_group)) { + dev_err(&d40c->chan.dev->device, + "[%s] Invalid event group\n", __func__); + res = -EINVAL; + } + + if (conf->dir == STEDMA40_PERIPH_TO_PERIPH) { + /* + * DMAC HW supports it. Will be added to this driver, + * in case any dma client requires it. + */ + dev_err(&d40c->chan.dev->device, + "[%s] periph to periph not supported\n", + __func__); + res = -EINVAL; + } + + return res; +} + +static bool d40_alloc_mask_set(struct d40_phy_res *phy, bool is_src, + int log_event_line) +{ + unsigned long flags; + spin_lock_irqsave(&phy->lock, flags); + if (!log_event_line) { + /* Physical interrupts are masked per physical full channel */ + if (phy->allocated_src == D40_ALLOC_FREE && + phy->allocated_dst == D40_ALLOC_FREE) { + phy->allocated_dst = D40_ALLOC_PHY; + phy->allocated_src = D40_ALLOC_PHY; + goto found; + } else + goto not_found; + } + + /* Logical channel */ + if (is_src) { + if (phy->allocated_src == D40_ALLOC_PHY) + goto not_found; + + if (phy->allocated_src == D40_ALLOC_FREE) + phy->allocated_src = D40_ALLOC_LOG_FREE; + + if (!(phy->allocated_src & (1 << log_event_line))) { + phy->allocated_src |= 1 << log_event_line; + goto found; + } else + goto not_found; + } else { + if (phy->allocated_dst == D40_ALLOC_PHY) + goto not_found; + + if (phy->allocated_dst == D40_ALLOC_FREE) + phy->allocated_dst = D40_ALLOC_LOG_FREE; + + if (!(phy->allocated_dst & (1 << log_event_line))) { + phy->allocated_dst |= 1 << log_event_line; + goto found; + } else + goto not_found; + } + +not_found: + spin_unlock_irqrestore(&phy->lock, flags); + return false; +found: + spin_unlock_irqrestore(&phy->lock, flags); + return true; +} + +static bool d40_alloc_mask_free(struct d40_phy_res *phy, bool is_src, + int log_event_line) +{ + unsigned long flags; + bool is_free = false; + + spin_lock_irqsave(&phy->lock, flags); + if (!log_event_line) { + /* Physical interrupts are masked per physical full channel */ + phy->allocated_dst = D40_ALLOC_FREE; + phy->allocated_src = D40_ALLOC_FREE; + is_free = true; + goto out; + } + + /* Logical channel */ + if (is_src) { + phy->allocated_src &= ~(1 << log_event_line); + if (phy->allocated_src == D40_ALLOC_LOG_FREE) + phy->allocated_src = D40_ALLOC_FREE; + } else { + phy->allocated_dst &= ~(1 << log_event_line); + if (phy->allocated_dst == D40_ALLOC_LOG_FREE) + phy->allocated_dst = D40_ALLOC_FREE; + } + + is_free = ((phy->allocated_src | phy->allocated_dst) == + D40_ALLOC_FREE); + +out: + spin_unlock_irqrestore(&phy->lock, flags); + + return is_free; +} + +static int d40_allocate_channel(struct d40_chan *d40c) +{ + int dev_type; + int event_group; + int event_line; + struct d40_phy_res *phys; + int i; + int j; + int log_num; + bool is_src; + bool is_log = (d40c->dma_cfg.channel_type & STEDMA40_CHANNEL_IN_OPER_MODE) + == STEDMA40_CHANNEL_IN_LOG_MODE; + + + phys = d40c->base->phy_res; + + if (d40c->dma_cfg.dir == STEDMA40_PERIPH_TO_MEM) { + dev_type = d40c->dma_cfg.src_dev_type; + log_num = 2 * dev_type; + is_src = true; + } else if (d40c->dma_cfg.dir == STEDMA40_MEM_TO_PERIPH || + d40c->dma_cfg.dir == STEDMA40_MEM_TO_MEM) { + /* dst event lines are used for logical memcpy */ + dev_type = d40c->dma_cfg.dst_dev_type; + log_num = 2 * dev_type + 1; + is_src = false; + } else + return -EINVAL; + + event_group = D40_TYPE_TO_GROUP(dev_type); + event_line = D40_TYPE_TO_EVENT(dev_type); + + if (!is_log) { + if (d40c->dma_cfg.dir == STEDMA40_MEM_TO_MEM) { + /* Find physical half channel */ + for (i = 0; i < d40c->base->num_phy_chans; i++) { + + if (d40_alloc_mask_set(&phys[i], is_src, 0)) + goto found_phy; + } + } else + for (j = 0; j < d40c->base->num_phy_chans; j += 8) { + int phy_num = j + event_group * 2; + for (i = phy_num; i < phy_num + 2; i++) { + if (d40_alloc_mask_set(&phys[i], + is_src, 0)) + goto found_phy; + } + } + return -EINVAL; +found_phy: + d40c->phy_chan = &phys[i]; + d40c->log_num = D40_PHY_CHAN; + goto out; + } + if (dev_type == -1) + return -EINVAL; + + /* Find logical channel */ + for (j = 0; j < d40c->base->num_phy_chans; j += 8) { + int phy_num = j + event_group * 2; + /* + * Spread logical channels across all available physical rather + * than pack every logical channel at the first available phy + * channels. + */ + if (is_src) { + for (i = phy_num; i < phy_num + 2; i++) { + if (d40_alloc_mask_set(&phys[i], is_src, + event_line)) + goto found_log; + } + } else { + for (i = phy_num + 1; i >= phy_num; i--) { + if (d40_alloc_mask_set(&phys[i], is_src, + event_line)) + goto found_log; + } + } + } + return -EINVAL; + +found_log: + d40c->phy_chan = &phys[i]; + d40c->log_num = log_num; +out: + + if (is_log) + d40c->base->lookup_log_chans[d40c->log_num] = d40c; + else + d40c->base->lookup_phy_chans[d40c->phy_chan->num] = d40c; + + return 0; + +} + +static int d40_config_chan(struct d40_chan *d40c, + struct stedma40_chan_cfg *info) +{ + + /* Fill in basic CFG register values */ + d40_phy_cfg(&d40c->dma_cfg, &d40c->src_def_cfg, + &d40c->dst_def_cfg, d40c->log_num != D40_PHY_CHAN); + + if (d40c->log_num != D40_PHY_CHAN) { + d40_log_cfg(&d40c->dma_cfg, + &d40c->log_def.lcsp1, &d40c->log_def.lcsp3); + + if (d40c->dma_cfg.dir == STEDMA40_PERIPH_TO_MEM) + d40c->lcpa = d40c->base->lcpa_base + + d40c->dma_cfg.src_dev_type * 32; + else + d40c->lcpa = d40c->base->lcpa_base + + d40c->dma_cfg.dst_dev_type * 32 + 16; + } + + /* Write channel configuration to the DMA */ + return d40_config_write(d40c); +} + +static int d40_config_memcpy(struct d40_chan *d40c) +{ + dma_cap_mask_t cap = d40c->chan.device->cap_mask; + + if (dma_has_cap(DMA_MEMCPY, cap) && !dma_has_cap(DMA_SLAVE, cap)) { + d40c->dma_cfg = *d40c->base->plat_data->memcpy_conf_log; + d40c->dma_cfg.src_dev_type = STEDMA40_DEV_SRC_MEMORY; + d40c->dma_cfg.dst_dev_type = d40c->base->plat_data-> + memcpy[d40c->chan.chan_id]; + + } else if (dma_has_cap(DMA_MEMCPY, cap) && + dma_has_cap(DMA_SLAVE, cap)) { + d40c->dma_cfg = *d40c->base->plat_data->memcpy_conf_phy; + } else { + dev_err(&d40c->chan.dev->device, "[%s] No memcpy\n", + __func__); + return -EINVAL; + } + + return 0; +} + + +static int d40_free_dma(struct d40_chan *d40c) +{ + + int res = 0; + u32 event, dir; + struct d40_phy_res *phy = d40c->phy_chan; + bool is_src; + + /* Terminate all queued and active transfers */ + d40_term_all(d40c); + + if (phy == NULL) { + dev_err(&d40c->chan.dev->device, "[%s] phy == null\n", + __func__); + return -EINVAL; + } + + if (phy->allocated_src == D40_ALLOC_FREE && + phy->allocated_dst == D40_ALLOC_FREE) { + dev_err(&d40c->chan.dev->device, "[%s] channel already free\n", + __func__); + return -EINVAL; + } + + + res = d40_channel_execute_command(d40c, D40_DMA_SUSPEND_REQ); + if (res) { + dev_err(&d40c->chan.dev->device, "[%s] suspend\n", + __func__); + return res; + } + + if (d40c->dma_cfg.dir == STEDMA40_MEM_TO_PERIPH || + d40c->dma_cfg.dir == STEDMA40_MEM_TO_MEM) { + event = D40_TYPE_TO_EVENT(d40c->dma_cfg.dst_dev_type); + dir = D40_CHAN_REG_SDLNK; + is_src = false; + } else if (d40c->dma_cfg.dir == STEDMA40_PERIPH_TO_MEM) { + event = D40_TYPE_TO_EVENT(d40c->dma_cfg.src_dev_type); + dir = D40_CHAN_REG_SSLNK; + is_src = true; + } else { + dev_err(&d40c->chan.dev->device, + "[%s] Unknown direction\n", __func__); + return -EINVAL; + } + + if (d40c->log_num != D40_PHY_CHAN) { + /* + * Release logical channel, deactivate the event line during + * the time physical res is suspended. + */ + writel((D40_DEACTIVATE_EVENTLINE << D40_EVENTLINE_POS(event)) & + D40_EVENTLINE_MASK(event), + d40c->base->virtbase + D40_DREG_PCBASE + + phy->num * D40_DREG_PCDELTA + dir); + + d40c->base->lookup_log_chans[d40c->log_num] = NULL; + + /* + * Check if there are more logical allocation + * on this phy channel. + */ + if (!d40_alloc_mask_free(phy, is_src, event)) { + /* Resume the other logical channels if any */ + if (d40_chan_has_events(d40c)) { + res = d40_channel_execute_command(d40c, + D40_DMA_RUN); + if (res) { + dev_err(&d40c->chan.dev->device, + "[%s] Executing RUN command\n", + __func__); + return res; + } + } + return 0; + } + } else + d40_alloc_mask_free(phy, is_src, 0); + + /* Release physical channel */ + res = d40_channel_execute_command(d40c, D40_DMA_STOP); + if (res) { + dev_err(&d40c->chan.dev->device, + "[%s] Failed to stop channel\n", __func__); + return res; + } + d40c->phy_chan = NULL; + /* Invalidate channel type */ + d40c->dma_cfg.channel_type = 0; + d40c->base->lookup_phy_chans[phy->num] = NULL; + + return 0; + + +} + +static int d40_pause(struct dma_chan *chan) +{ + struct d40_chan *d40c = + container_of(chan, struct d40_chan, chan); + int res; + + unsigned long flags; + + spin_lock_irqsave(&d40c->lock, flags); + + res = d40_channel_execute_command(d40c, D40_DMA_SUSPEND_REQ); + if (res == 0) { + if (d40c->log_num != D40_PHY_CHAN) { + d40_config_set_event(d40c, false); + /* Resume the other logical channels if any */ + if (d40_chan_has_events(d40c)) + res = d40_channel_execute_command(d40c, + D40_DMA_RUN); + } + } + + spin_unlock_irqrestore(&d40c->lock, flags); + return res; +} + +static bool d40_tx_is_linked(struct d40_chan *d40c) +{ + bool is_link; + + if (d40c->log_num != D40_PHY_CHAN) + is_link = readl(&d40c->lcpa->lcsp3) & D40_MEM_LCSP3_DLOS_MASK; + else + is_link = readl(d40c->base->virtbase + D40_DREG_PCBASE + + d40c->phy_chan->num * D40_DREG_PCDELTA + + D40_CHAN_REG_SDLNK) & + D40_SREG_LNK_PHYS_LNK_MASK; + return is_link; +} + +static u32 d40_residue(struct d40_chan *d40c) +{ + u32 num_elt; + + if (d40c->log_num != D40_PHY_CHAN) + num_elt = (readl(&d40c->lcpa->lcsp2) & D40_MEM_LCSP2_ECNT_MASK) + >> D40_MEM_LCSP2_ECNT_POS; + else + num_elt = (readl(d40c->base->virtbase + D40_DREG_PCBASE + + d40c->phy_chan->num * D40_DREG_PCDELTA + + D40_CHAN_REG_SDELT) & + D40_SREG_ELEM_PHY_ECNT_MASK) >> D40_SREG_ELEM_PHY_ECNT_POS; + return num_elt * (1 << d40c->dma_cfg.dst_info.data_width); +} + +static int d40_resume(struct dma_chan *chan) +{ + struct d40_chan *d40c = + container_of(chan, struct d40_chan, chan); + int res = 0; + unsigned long flags; + + spin_lock_irqsave(&d40c->lock, flags); + + if (d40c->log_num != D40_PHY_CHAN) { + res = d40_channel_execute_command(d40c, D40_DMA_SUSPEND_REQ); + if (res) + goto out; + + /* If bytes left to transfer or linked tx resume job */ + if (d40_residue(d40c) || d40_tx_is_linked(d40c)) { + d40_config_set_event(d40c, true); + res = d40_channel_execute_command(d40c, D40_DMA_RUN); + } + } else if (d40_residue(d40c) || d40_tx_is_linked(d40c)) + res = d40_channel_execute_command(d40c, D40_DMA_RUN); + +out: + spin_unlock_irqrestore(&d40c->lock, flags); + return res; +} + +static u32 stedma40_residue(struct dma_chan *chan) +{ + struct d40_chan *d40c = + container_of(chan, struct d40_chan, chan); + u32 bytes_left; + unsigned long flags; + + spin_lock_irqsave(&d40c->lock, flags); + bytes_left = d40_residue(d40c); + spin_unlock_irqrestore(&d40c->lock, flags); + + return bytes_left; +} + +/* Public DMA functions in addition to the DMA engine framework */ + +int stedma40_set_psize(struct dma_chan *chan, + int src_psize, + int dst_psize) +{ + struct d40_chan *d40c = + container_of(chan, struct d40_chan, chan); + unsigned long flags; + + spin_lock_irqsave(&d40c->lock, flags); + + if (d40c->log_num != D40_PHY_CHAN) { + d40c->log_def.lcsp1 &= ~D40_MEM_LCSP1_SCFG_PSIZE_MASK; + d40c->log_def.lcsp3 &= ~D40_MEM_LCSP1_SCFG_PSIZE_MASK; + d40c->log_def.lcsp1 |= src_psize << D40_MEM_LCSP1_SCFG_PSIZE_POS; + d40c->log_def.lcsp3 |= dst_psize << D40_MEM_LCSP1_SCFG_PSIZE_POS; + goto out; + } + + if (src_psize == STEDMA40_PSIZE_PHY_1) + d40c->src_def_cfg &= ~(1 << D40_SREG_CFG_PHY_PEN_POS); + else { + d40c->src_def_cfg |= 1 << D40_SREG_CFG_PHY_PEN_POS; + d40c->src_def_cfg &= ~(STEDMA40_PSIZE_PHY_16 << + D40_SREG_CFG_PSIZE_POS); + d40c->src_def_cfg |= src_psize << D40_SREG_CFG_PSIZE_POS; + } + + if (dst_psize == STEDMA40_PSIZE_PHY_1) + d40c->dst_def_cfg &= ~(1 << D40_SREG_CFG_PHY_PEN_POS); + else { + d40c->dst_def_cfg |= 1 << D40_SREG_CFG_PHY_PEN_POS; + d40c->dst_def_cfg &= ~(STEDMA40_PSIZE_PHY_16 << + D40_SREG_CFG_PSIZE_POS); + d40c->dst_def_cfg |= dst_psize << D40_SREG_CFG_PSIZE_POS; + } +out: + spin_unlock_irqrestore(&d40c->lock, flags); + return 0; +} +EXPORT_SYMBOL(stedma40_set_psize); + +struct dma_async_tx_descriptor *stedma40_memcpy_sg(struct dma_chan *chan, + struct scatterlist *sgl_dst, + struct scatterlist *sgl_src, + unsigned int sgl_len, + unsigned long flags) +{ + int res; + struct d40_desc *d40d; + struct d40_chan *d40c = container_of(chan, struct d40_chan, + chan); + unsigned long flg; + int lli_max = d40c->base->plat_data->llis_per_log; + + + spin_lock_irqsave(&d40c->lock, flg); + d40d = d40_desc_get(d40c); + + if (d40d == NULL) + goto err; + + memset(d40d, 0, sizeof(struct d40_desc)); + d40d->lli_len = sgl_len; + + d40d->txd.flags = flags; + + if (d40c->log_num != D40_PHY_CHAN) { + if (sgl_len > 1) + /* + * Check if there is space available in lcla. If not, + * split list into 1-length and run only in lcpa + * space. + */ + if (d40_lcla_id_get(d40c, + &d40c->base->lcla_pool) != 0) + lli_max = 1; + + if (d40_pool_lli_alloc(d40d, sgl_len, true) < 0) { + dev_err(&d40c->chan.dev->device, + "[%s] Out of memory\n", __func__); + goto err; + } + + (void) d40_log_sg_to_lli(d40c->lcla.src_id, + sgl_src, + sgl_len, + d40d->lli_log.src, + d40c->log_def.lcsp1, + d40c->dma_cfg.src_info.data_width, + flags & DMA_PREP_INTERRUPT, lli_max, + d40c->base->plat_data->llis_per_log); + + (void) d40_log_sg_to_lli(d40c->lcla.dst_id, + sgl_dst, + sgl_len, + d40d->lli_log.dst, + d40c->log_def.lcsp3, + d40c->dma_cfg.dst_info.data_width, + flags & DMA_PREP_INTERRUPT, lli_max, + d40c->base->plat_data->llis_per_log); + + + } else { + if (d40_pool_lli_alloc(d40d, sgl_len, false) < 0) { + dev_err(&d40c->chan.dev->device, + "[%s] Out of memory\n", __func__); + goto err; + } + + res = d40_phy_sg_to_lli(sgl_src, + sgl_len, + 0, + d40d->lli_phy.src, + d40d->lli_phy.src_addr, + d40c->src_def_cfg, + d40c->dma_cfg.src_info.data_width, + d40c->dma_cfg.src_info.psize, + true); + + if (res < 0) + goto err; + + res = d40_phy_sg_to_lli(sgl_dst, + sgl_len, + 0, + d40d->lli_phy.dst, + d40d->lli_phy.dst_addr, + d40c->dst_def_cfg, + d40c->dma_cfg.dst_info.data_width, + d40c->dma_cfg.dst_info.psize, + true); + + if (res < 0) + goto err; + + (void) dma_map_single(d40c->base->dev, d40d->lli_phy.src, + d40d->lli_pool.size, DMA_TO_DEVICE); + } + + dma_async_tx_descriptor_init(&d40d->txd, chan); + + d40d->txd.tx_submit = d40_tx_submit; + + spin_unlock_irqrestore(&d40c->lock, flg); + + return &d40d->txd; +err: + spin_unlock_irqrestore(&d40c->lock, flg); + return NULL; +} +EXPORT_SYMBOL(stedma40_memcpy_sg); + +bool stedma40_filter(struct dma_chan *chan, void *data) +{ + struct stedma40_chan_cfg *info = data; + struct d40_chan *d40c = + container_of(chan, struct d40_chan, chan); + int err; + + if (data) { + err = d40_validate_conf(d40c, info); + if (!err) + d40c->dma_cfg = *info; + } else + err = d40_config_memcpy(d40c); + + return err == 0; +} +EXPORT_SYMBOL(stedma40_filter); + +/* DMA ENGINE functions */ +static int d40_alloc_chan_resources(struct dma_chan *chan) +{ + int err; + unsigned long flags; + struct d40_chan *d40c = + container_of(chan, struct d40_chan, chan); + + spin_lock_irqsave(&d40c->lock, flags); + + d40c->completed = chan->cookie = 1; + + /* + * If no dma configuration is set (channel_type == 0) + * use default configuration + */ + if (d40c->dma_cfg.channel_type == 0) { + err = d40_config_memcpy(d40c); + if (err) + goto err_alloc; + } + + err = d40_allocate_channel(d40c); + if (err) { + dev_err(&d40c->chan.dev->device, + "[%s] Failed to allocate channel\n", __func__); + goto err_alloc; + } + + err = d40_config_chan(d40c, &d40c->dma_cfg); + if (err) { + dev_err(&d40c->chan.dev->device, + "[%s] Failed to configure channel\n", + __func__); + goto err_config; + } + + spin_unlock_irqrestore(&d40c->lock, flags); + return 0; + + err_config: + (void) d40_free_dma(d40c); + err_alloc: + spin_unlock_irqrestore(&d40c->lock, flags); + dev_err(&d40c->chan.dev->device, + "[%s] Channel allocation failed\n", __func__); + return -EINVAL; +} + +static void d40_free_chan_resources(struct dma_chan *chan) +{ + struct d40_chan *d40c = + container_of(chan, struct d40_chan, chan); + int err; + unsigned long flags; + + spin_lock_irqsave(&d40c->lock, flags); + + err = d40_free_dma(d40c); + + if (err) + dev_err(&d40c->chan.dev->device, + "[%s] Failed to free channel\n", __func__); + spin_unlock_irqrestore(&d40c->lock, flags); +} + +static struct dma_async_tx_descriptor *d40_prep_memcpy(struct dma_chan *chan, + dma_addr_t dst, + dma_addr_t src, + size_t size, + unsigned long flags) +{ + struct d40_desc *d40d; + struct d40_chan *d40c = container_of(chan, struct d40_chan, + chan); + unsigned long flg; + int err = 0; + + spin_lock_irqsave(&d40c->lock, flg); + d40d = d40_desc_get(d40c); + + if (d40d == NULL) { + dev_err(&d40c->chan.dev->device, + "[%s] Descriptor is NULL\n", __func__); + goto err; + } + + memset(d40d, 0, sizeof(struct d40_desc)); + + d40d->txd.flags = flags; + + dma_async_tx_descriptor_init(&d40d->txd, chan); + + d40d->txd.tx_submit = d40_tx_submit; + + if (d40c->log_num != D40_PHY_CHAN) { + + if (d40_pool_lli_alloc(d40d, 1, true) < 0) { + dev_err(&d40c->chan.dev->device, + "[%s] Out of memory\n", __func__); + goto err; + } + d40d->lli_len = 1; + + d40_log_fill_lli(d40d->lli_log.src, + src, + size, + 0, + d40c->log_def.lcsp1, + d40c->dma_cfg.src_info.data_width, + true, true); + + d40_log_fill_lli(d40d->lli_log.dst, + dst, + size, + 0, + d40c->log_def.lcsp3, + d40c->dma_cfg.dst_info.data_width, + true, true); + + } else { + + if (d40_pool_lli_alloc(d40d, 1, false) < 0) { + dev_err(&d40c->chan.dev->device, + "[%s] Out of memory\n", __func__); + goto err; + } + + err = d40_phy_fill_lli(d40d->lli_phy.src, + src, + size, + d40c->dma_cfg.src_info.psize, + 0, + d40c->src_def_cfg, + true, + d40c->dma_cfg.src_info.data_width, + false); + if (err) + goto err_fill_lli; + + err = d40_phy_fill_lli(d40d->lli_phy.dst, + dst, + size, + d40c->dma_cfg.dst_info.psize, + 0, + d40c->dst_def_cfg, + true, + d40c->dma_cfg.dst_info.data_width, + false); + + if (err) + goto err_fill_lli; + + (void) dma_map_single(d40c->base->dev, d40d->lli_phy.src, + d40d->lli_pool.size, DMA_TO_DEVICE); + } + + spin_unlock_irqrestore(&d40c->lock, flg); + return &d40d->txd; + +err_fill_lli: + dev_err(&d40c->chan.dev->device, + "[%s] Failed filling in PHY LLI\n", __func__); + d40_pool_lli_free(d40d); +err: + spin_unlock_irqrestore(&d40c->lock, flg); + return NULL; +} + +static int d40_prep_slave_sg_log(struct d40_desc *d40d, + struct d40_chan *d40c, + struct scatterlist *sgl, + unsigned int sg_len, + enum dma_data_direction direction, + unsigned long flags) +{ + dma_addr_t dev_addr = 0; + int total_size; + int lli_max = d40c->base->plat_data->llis_per_log; + + if (d40_pool_lli_alloc(d40d, sg_len, true) < 0) { + dev_err(&d40c->chan.dev->device, + "[%s] Out of memory\n", __func__); + return -ENOMEM; + } + + d40d->lli_len = sg_len; + d40d->lli_tcount = 0; + + if (sg_len > 1) + /* + * Check if there is space available in lcla. + * If not, split list into 1-length and run only + * in lcpa space. + */ + if (d40_lcla_id_get(d40c, &d40c->base->lcla_pool) != 0) + lli_max = 1; + + if (direction == DMA_FROM_DEVICE) { + dev_addr = d40c->base->plat_data->dev_rx[d40c->dma_cfg.src_dev_type]; + total_size = d40_log_sg_to_dev(&d40c->lcla, + sgl, sg_len, + &d40d->lli_log, + &d40c->log_def, + d40c->dma_cfg.src_info.data_width, + d40c->dma_cfg.dst_info.data_width, + direction, + flags & DMA_PREP_INTERRUPT, + dev_addr, lli_max, + d40c->base->plat_data->llis_per_log); + } else if (direction == DMA_TO_DEVICE) { + dev_addr = d40c->base->plat_data->dev_tx[d40c->dma_cfg.dst_dev_type]; + total_size = d40_log_sg_to_dev(&d40c->lcla, + sgl, sg_len, + &d40d->lli_log, + &d40c->log_def, + d40c->dma_cfg.src_info.data_width, + d40c->dma_cfg.dst_info.data_width, + direction, + flags & DMA_PREP_INTERRUPT, + dev_addr, lli_max, + d40c->base->plat_data->llis_per_log); + } else + return -EINVAL; + if (total_size < 0) + return -EINVAL; + + return 0; +} + +static int d40_prep_slave_sg_phy(struct d40_desc *d40d, + struct d40_chan *d40c, + struct scatterlist *sgl, + unsigned int sgl_len, + enum dma_data_direction direction, + unsigned long flags) +{ + dma_addr_t src_dev_addr; + dma_addr_t dst_dev_addr; + int res; + + if (d40_pool_lli_alloc(d40d, sgl_len, false) < 0) { + dev_err(&d40c->chan.dev->device, + "[%s] Out of memory\n", __func__); + return -ENOMEM; + } + + d40d->lli_len = sgl_len; + d40d->lli_tcount = 0; + + if (direction == DMA_FROM_DEVICE) { + dst_dev_addr = 0; + src_dev_addr = d40c->base->plat_data->dev_rx[d40c->dma_cfg.src_dev_type]; + } else if (direction == DMA_TO_DEVICE) { + dst_dev_addr = d40c->base->plat_data->dev_tx[d40c->dma_cfg.dst_dev_type]; + src_dev_addr = 0; + } else + return -EINVAL; + + res = d40_phy_sg_to_lli(sgl, + sgl_len, + src_dev_addr, + d40d->lli_phy.src, + d40d->lli_phy.src_addr, + d40c->src_def_cfg, + d40c->dma_cfg.src_info.data_width, + d40c->dma_cfg.src_info.psize, + true); + if (res < 0) + return res; + + res = d40_phy_sg_to_lli(sgl, + sgl_len, + dst_dev_addr, + d40d->lli_phy.dst, + d40d->lli_phy.dst_addr, + d40c->dst_def_cfg, + d40c->dma_cfg.dst_info.data_width, + d40c->dma_cfg.dst_info.psize, + true); + if (res < 0) + return res; + + (void) dma_map_single(d40c->base->dev, d40d->lli_phy.src, + d40d->lli_pool.size, DMA_TO_DEVICE); + return 0; +} + +static struct dma_async_tx_descriptor *d40_prep_slave_sg(struct dma_chan *chan, + struct scatterlist *sgl, + unsigned int sg_len, + enum dma_data_direction direction, + unsigned long flags) +{ + struct d40_desc *d40d; + struct d40_chan *d40c = container_of(chan, struct d40_chan, + chan); + unsigned long flg; + int err; + + if (d40c->dma_cfg.pre_transfer) + d40c->dma_cfg.pre_transfer(chan, + d40c->dma_cfg.pre_transfer_data, + sg_dma_len(sgl)); + + spin_lock_irqsave(&d40c->lock, flg); + d40d = d40_desc_get(d40c); + spin_unlock_irqrestore(&d40c->lock, flg); + + if (d40d == NULL) + return NULL; + + memset(d40d, 0, sizeof(struct d40_desc)); + + if (d40c->log_num != D40_PHY_CHAN) + err = d40_prep_slave_sg_log(d40d, d40c, sgl, sg_len, + direction, flags); + else + err = d40_prep_slave_sg_phy(d40d, d40c, sgl, sg_len, + direction, flags); + if (err) { + dev_err(&d40c->chan.dev->device, + "[%s] Failed to prepare %s slave sg job: %d\n", + __func__, + d40c->log_num != D40_PHY_CHAN ? "log" : "phy", err); + return NULL; + } + + d40d->txd.flags = flags; + + dma_async_tx_descriptor_init(&d40d->txd, chan); + + d40d->txd.tx_submit = d40_tx_submit; + + return &d40d->txd; +} + +static enum dma_status d40_tx_status(struct dma_chan *chan, + dma_cookie_t cookie, + struct dma_tx_state *txstate) +{ + struct d40_chan *d40c = container_of(chan, struct d40_chan, chan); + dma_cookie_t last_used; + dma_cookie_t last_complete; + int ret; + + last_complete = d40c->completed; + last_used = chan->cookie; + + ret = dma_async_is_complete(cookie, last_complete, last_used); + + if (txstate) { + txstate->last = last_complete; + txstate->used = last_used; + txstate->residue = stedma40_residue(chan); + } + + return ret; +} + +static void d40_issue_pending(struct dma_chan *chan) +{ + struct d40_chan *d40c = container_of(chan, struct d40_chan, chan); + unsigned long flags; + + spin_lock_irqsave(&d40c->lock, flags); + + /* Busy means that pending jobs are already being processed */ + if (!d40c->busy) + (void) d40_queue_start(d40c); + + spin_unlock_irqrestore(&d40c->lock, flags); +} + +static int d40_control(struct dma_chan *chan, enum dma_ctrl_cmd cmd) +{ + unsigned long flags; + struct d40_chan *d40c = container_of(chan, struct d40_chan, chan); + + switch (cmd) { + case DMA_TERMINATE_ALL: + spin_lock_irqsave(&d40c->lock, flags); + d40_term_all(d40c); + spin_unlock_irqrestore(&d40c->lock, flags); + return 0; + case DMA_PAUSE: + return d40_pause(chan); + case DMA_RESUME: + return d40_resume(chan); + } + + /* Other commands are unimplemented */ + return -ENXIO; +} + +/* Initialization functions */ + +static void __init d40_chan_init(struct d40_base *base, struct dma_device *dma, + struct d40_chan *chans, int offset, + int num_chans) +{ + int i = 0; + struct d40_chan *d40c; + + INIT_LIST_HEAD(&dma->channels); + + for (i = offset; i < offset + num_chans; i++) { + d40c = &chans[i]; + d40c->base = base; + d40c->chan.device = dma; + + /* Invalidate lcla element */ + d40c->lcla.src_id = -1; + d40c->lcla.dst_id = -1; + + spin_lock_init(&d40c->lock); + + d40c->log_num = D40_PHY_CHAN; + + INIT_LIST_HEAD(&d40c->free); + INIT_LIST_HEAD(&d40c->active); + INIT_LIST_HEAD(&d40c->queue); + INIT_LIST_HEAD(&d40c->client); + + d40c->free_len = 0; + + tasklet_init(&d40c->tasklet, dma_tasklet, + (unsigned long) d40c); + + list_add_tail(&d40c->chan.device_node, + &dma->channels); + } +} + +static int __init d40_dmaengine_init(struct d40_base *base, + int num_reserved_chans) +{ + int err ; + + d40_chan_init(base, &base->dma_slave, base->log_chans, + 0, base->num_log_chans); + + dma_cap_zero(base->dma_slave.cap_mask); + dma_cap_set(DMA_SLAVE, base->dma_slave.cap_mask); + + base->dma_slave.device_alloc_chan_resources = d40_alloc_chan_resources; + base->dma_slave.device_free_chan_resources = d40_free_chan_resources; + base->dma_slave.device_prep_dma_memcpy = d40_prep_memcpy; + base->dma_slave.device_prep_slave_sg = d40_prep_slave_sg; + base->dma_slave.device_tx_status = d40_tx_status; + base->dma_slave.device_issue_pending = d40_issue_pending; + base->dma_slave.device_control = d40_control; + base->dma_slave.dev = base->dev; + + err = dma_async_device_register(&base->dma_slave); + + if (err) { + dev_err(base->dev, + "[%s] Failed to register slave channels\n", + __func__); + goto failure1; + } + + d40_chan_init(base, &base->dma_memcpy, base->log_chans, + base->num_log_chans, base->plat_data->memcpy_len); + + dma_cap_zero(base->dma_memcpy.cap_mask); + dma_cap_set(DMA_MEMCPY, base->dma_memcpy.cap_mask); + + base->dma_memcpy.device_alloc_chan_resources = d40_alloc_chan_resources; + base->dma_memcpy.device_free_chan_resources = d40_free_chan_resources; + base->dma_memcpy.device_prep_dma_memcpy = d40_prep_memcpy; + base->dma_memcpy.device_prep_slave_sg = d40_prep_slave_sg; + base->dma_memcpy.device_tx_status = d40_tx_status; + base->dma_memcpy.device_issue_pending = d40_issue_pending; + base->dma_memcpy.device_control = d40_control; + base->dma_memcpy.dev = base->dev; + /* + * This controller can only access address at even + * 32bit boundaries, i.e. 2^2 + */ + base->dma_memcpy.copy_align = 2; + + err = dma_async_device_register(&base->dma_memcpy); + + if (err) { + dev_err(base->dev, + "[%s] Failed to regsiter memcpy only channels\n", + __func__); + goto failure2; + } + + d40_chan_init(base, &base->dma_both, base->phy_chans, + 0, num_reserved_chans); + + dma_cap_zero(base->dma_both.cap_mask); + dma_cap_set(DMA_SLAVE, base->dma_both.cap_mask); + dma_cap_set(DMA_MEMCPY, base->dma_both.cap_mask); + + base->dma_both.device_alloc_chan_resources = d40_alloc_chan_resources; + base->dma_both.device_free_chan_resources = d40_free_chan_resources; + base->dma_both.device_prep_dma_memcpy = d40_prep_memcpy; + base->dma_both.device_prep_slave_sg = d40_prep_slave_sg; + base->dma_both.device_tx_status = d40_tx_status; + base->dma_both.device_issue_pending = d40_issue_pending; + base->dma_both.device_control = d40_control; + base->dma_both.dev = base->dev; + base->dma_both.copy_align = 2; + err = dma_async_device_register(&base->dma_both); + + if (err) { + dev_err(base->dev, + "[%s] Failed to register logical and physical capable channels\n", + __func__); + goto failure3; + } + return 0; +failure3: + dma_async_device_unregister(&base->dma_memcpy); +failure2: + dma_async_device_unregister(&base->dma_slave); +failure1: + return err; +} + +/* Initialization functions. */ + +static int __init d40_phy_res_init(struct d40_base *base) +{ + int i; + int num_phy_chans_avail = 0; + u32 val[2]; + int odd_even_bit = -2; + + val[0] = readl(base->virtbase + D40_DREG_PRSME); + val[1] = readl(base->virtbase + D40_DREG_PRSMO); + + for (i = 0; i < base->num_phy_chans; i++) { + base->phy_res[i].num = i; + odd_even_bit += 2 * ((i % 2) == 0); + if (((val[i % 2] >> odd_even_bit) & 3) == 1) { + /* Mark security only channels as occupied */ + base->phy_res[i].allocated_src = D40_ALLOC_PHY; + base->phy_res[i].allocated_dst = D40_ALLOC_PHY; + } else { + base->phy_res[i].allocated_src = D40_ALLOC_FREE; + base->phy_res[i].allocated_dst = D40_ALLOC_FREE; + num_phy_chans_avail++; + } + spin_lock_init(&base->phy_res[i].lock); + } + dev_info(base->dev, "%d of %d physical DMA channels available\n", + num_phy_chans_avail, base->num_phy_chans); + + /* Verify settings extended vs standard */ + val[0] = readl(base->virtbase + D40_DREG_PRTYP); + + for (i = 0; i < base->num_phy_chans; i++) { + + if (base->phy_res[i].allocated_src == D40_ALLOC_FREE && + (val[0] & 0x3) != 1) + dev_info(base->dev, + "[%s] INFO: channel %d is misconfigured (%d)\n", + __func__, i, val[0] & 0x3); + + val[0] = val[0] >> 2; + } + + return num_phy_chans_avail; +} + +static struct d40_base * __init d40_hw_detect_init(struct platform_device *pdev) +{ + static const struct d40_reg_val dma_id_regs[] = { + /* Peripheral Id */ + { .reg = D40_DREG_PERIPHID0, .val = 0x0040}, + { .reg = D40_DREG_PERIPHID1, .val = 0x0000}, + /* + * D40_DREG_PERIPHID2 Depends on HW revision: + * MOP500/HREF ED has 0x0008, + * ? has 0x0018, + * HREF V1 has 0x0028 + */ + { .reg = D40_DREG_PERIPHID3, .val = 0x0000}, + + /* PCell Id */ + { .reg = D40_DREG_CELLID0, .val = 0x000d}, + { .reg = D40_DREG_CELLID1, .val = 0x00f0}, + { .reg = D40_DREG_CELLID2, .val = 0x0005}, + { .reg = D40_DREG_CELLID3, .val = 0x00b1} + }; + struct stedma40_platform_data *plat_data; + struct clk *clk = NULL; + void __iomem *virtbase = NULL; + struct resource *res = NULL; + struct d40_base *base = NULL; + int num_log_chans = 0; + int num_phy_chans; + int i; + + clk = clk_get(&pdev->dev, NULL); + + if (IS_ERR(clk)) { + dev_err(&pdev->dev, "[%s] No matching clock found\n", + __func__); + goto failure; + } + + clk_enable(clk); + + /* Get IO for DMAC base address */ + res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "base"); + if (!res) + goto failure; + + if (request_mem_region(res->start, resource_size(res), + D40_NAME " I/O base") == NULL) + goto failure; + + virtbase = ioremap(res->start, resource_size(res)); + if (!virtbase) + goto failure; + + /* HW version check */ + for (i = 0; i < ARRAY_SIZE(dma_id_regs); i++) { + if (dma_id_regs[i].val != + readl(virtbase + dma_id_regs[i].reg)) { + dev_err(&pdev->dev, + "[%s] Unknown hardware! Expected 0x%x at 0x%x but got 0x%x\n", + __func__, + dma_id_regs[i].val, + dma_id_regs[i].reg, + readl(virtbase + dma_id_regs[i].reg)); + goto failure; + } + } + + i = readl(virtbase + D40_DREG_PERIPHID2); + + if ((i & 0xf) != D40_PERIPHID2_DESIGNER) { + dev_err(&pdev->dev, + "[%s] Unknown designer! Got %x wanted %x\n", + __func__, i & 0xf, D40_PERIPHID2_DESIGNER); + goto failure; + } + + /* The number of physical channels on this HW */ + num_phy_chans = 4 * (readl(virtbase + D40_DREG_ICFG) & 0x7) + 4; + + dev_info(&pdev->dev, "hardware revision: %d @ 0x%x\n", + (i >> 4) & 0xf, res->start); + + plat_data = pdev->dev.platform_data; + + /* Count the number of logical channels in use */ + for (i = 0; i < plat_data->dev_len; i++) + if (plat_data->dev_rx[i] != 0) + num_log_chans++; + + for (i = 0; i < plat_data->dev_len; i++) + if (plat_data->dev_tx[i] != 0) + num_log_chans++; + + base = kzalloc(ALIGN(sizeof(struct d40_base), 4) + + (num_phy_chans + num_log_chans + plat_data->memcpy_len) * + sizeof(struct d40_chan), GFP_KERNEL); + + if (base == NULL) { + dev_err(&pdev->dev, "[%s] Out of memory\n", __func__); + goto failure; + } + + base->clk = clk; + base->num_phy_chans = num_phy_chans; + base->num_log_chans = num_log_chans; + base->phy_start = res->start; + base->phy_size = resource_size(res); + base->virtbase = virtbase; + base->plat_data = plat_data; + base->dev = &pdev->dev; + base->phy_chans = ((void *)base) + ALIGN(sizeof(struct d40_base), 4); + base->log_chans = &base->phy_chans[num_phy_chans]; + + base->phy_res = kzalloc(num_phy_chans * sizeof(struct d40_phy_res), + GFP_KERNEL); + if (!base->phy_res) + goto failure; + + base->lookup_phy_chans = kzalloc(num_phy_chans * + sizeof(struct d40_chan *), + GFP_KERNEL); + if (!base->lookup_phy_chans) + goto failure; + + if (num_log_chans + plat_data->memcpy_len) { + /* + * The max number of logical channels are event lines for all + * src devices and dst devices + */ + base->lookup_log_chans = kzalloc(plat_data->dev_len * 2 * + sizeof(struct d40_chan *), + GFP_KERNEL); + if (!base->lookup_log_chans) + goto failure; + } + base->lcla_pool.alloc_map = kzalloc(num_phy_chans * sizeof(u32), + GFP_KERNEL); + if (!base->lcla_pool.alloc_map) + goto failure; + + return base; + +failure: + if (clk) { + clk_disable(clk); + clk_put(clk); + } + if (virtbase) + iounmap(virtbase); + if (res) + release_mem_region(res->start, + resource_size(res)); + if (virtbase) + iounmap(virtbase); + + if (base) { + kfree(base->lcla_pool.alloc_map); + kfree(base->lookup_log_chans); + kfree(base->lookup_phy_chans); + kfree(base->phy_res); + kfree(base); + } + + return NULL; +} + +static void __init d40_hw_init(struct d40_base *base) +{ + + static const struct d40_reg_val dma_init_reg[] = { + /* Clock every part of the DMA block from start */ + { .reg = D40_DREG_GCC, .val = 0x0000ff01}, + + /* Interrupts on all logical channels */ + { .reg = D40_DREG_LCMIS0, .val = 0xFFFFFFFF}, + { .reg = D40_DREG_LCMIS1, .val = 0xFFFFFFFF}, + { .reg = D40_DREG_LCMIS2, .val = 0xFFFFFFFF}, + { .reg = D40_DREG_LCMIS3, .val = 0xFFFFFFFF}, + { .reg = D40_DREG_LCICR0, .val = 0xFFFFFFFF}, + { .reg = D40_DREG_LCICR1, .val = 0xFFFFFFFF}, + { .reg = D40_DREG_LCICR2, .val = 0xFFFFFFFF}, + { .reg = D40_DREG_LCICR3, .val = 0xFFFFFFFF}, + { .reg = D40_DREG_LCTIS0, .val = 0xFFFFFFFF}, + { .reg = D40_DREG_LCTIS1, .val = 0xFFFFFFFF}, + { .reg = D40_DREG_LCTIS2, .val = 0xFFFFFFFF}, + { .reg = D40_DREG_LCTIS3, .val = 0xFFFFFFFF} + }; + int i; + u32 prmseo[2] = {0, 0}; + u32 activeo[2] = {0xFFFFFFFF, 0xFFFFFFFF}; + u32 pcmis = 0; + u32 pcicr = 0; + + for (i = 0; i < ARRAY_SIZE(dma_init_reg); i++) + writel(dma_init_reg[i].val, + base->virtbase + dma_init_reg[i].reg); + + /* Configure all our dma channels to default settings */ + for (i = 0; i < base->num_phy_chans; i++) { + + activeo[i % 2] = activeo[i % 2] << 2; + + if (base->phy_res[base->num_phy_chans - i - 1].allocated_src + == D40_ALLOC_PHY) { + activeo[i % 2] |= 3; + continue; + } + + /* Enable interrupt # */ + pcmis = (pcmis << 1) | 1; + + /* Clear interrupt # */ + pcicr = (pcicr << 1) | 1; + + /* Set channel to physical mode */ + prmseo[i % 2] = prmseo[i % 2] << 2; + prmseo[i % 2] |= 1; + + } + + writel(prmseo[1], base->virtbase + D40_DREG_PRMSE); + writel(prmseo[0], base->virtbase + D40_DREG_PRMSO); + writel(activeo[1], base->virtbase + D40_DREG_ACTIVE); + writel(activeo[0], base->virtbase + D40_DREG_ACTIVO); + + /* Write which interrupt to enable */ + writel(pcmis, base->virtbase + D40_DREG_PCMIS); + + /* Write which interrupt to clear */ + writel(pcicr, base->virtbase + D40_DREG_PCICR); + +} + +static int __init d40_probe(struct platform_device *pdev) +{ + int err; + int ret = -ENOENT; + struct d40_base *base; + struct resource *res = NULL; + int num_reserved_chans; + u32 val; + + base = d40_hw_detect_init(pdev); + + if (!base) + goto failure; + + num_reserved_chans = d40_phy_res_init(base); + + platform_set_drvdata(pdev, base); + + spin_lock_init(&base->interrupt_lock); + spin_lock_init(&base->execmd_lock); + + /* Get IO for logical channel parameter address */ + res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "lcpa"); + if (!res) { + ret = -ENOENT; + dev_err(&pdev->dev, + "[%s] No \"lcpa\" memory resource\n", + __func__); + goto failure; + } + base->lcpa_size = resource_size(res); + base->phy_lcpa = res->start; + + if (request_mem_region(res->start, resource_size(res), + D40_NAME " I/O lcpa") == NULL) { + ret = -EBUSY; + dev_err(&pdev->dev, + "[%s] Failed to request LCPA region 0x%x-0x%x\n", + __func__, res->start, res->end); + goto failure; + } + + /* We make use of ESRAM memory for this. */ + val = readl(base->virtbase + D40_DREG_LCPA); + if (res->start != val && val != 0) { + dev_warn(&pdev->dev, + "[%s] Mismatch LCPA dma 0x%x, def 0x%x\n", + __func__, val, res->start); + } else + writel(res->start, base->virtbase + D40_DREG_LCPA); + + base->lcpa_base = ioremap(res->start, resource_size(res)); + if (!base->lcpa_base) { + ret = -ENOMEM; + dev_err(&pdev->dev, + "[%s] Failed to ioremap LCPA region\n", + __func__); + goto failure; + } + /* Get IO for logical channel link address */ + res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "lcla"); + if (!res) { + ret = -ENOENT; + dev_err(&pdev->dev, + "[%s] No \"lcla\" resource defined\n", + __func__); + goto failure; + } + + base->lcla_pool.base_size = resource_size(res); + base->lcla_pool.phy = res->start; + + if (request_mem_region(res->start, resource_size(res), + D40_NAME " I/O lcla") == NULL) { + ret = -EBUSY; + dev_err(&pdev->dev, + "[%s] Failed to request LCLA region 0x%x-0x%x\n", + __func__, res->start, res->end); + goto failure; + } + val = readl(base->virtbase + D40_DREG_LCLA); + if (res->start != val && val != 0) { + dev_warn(&pdev->dev, + "[%s] Mismatch LCLA dma 0x%x, def 0x%x\n", + __func__, val, res->start); + } else + writel(res->start, base->virtbase + D40_DREG_LCLA); + + base->lcla_pool.base = ioremap(res->start, resource_size(res)); + if (!base->lcla_pool.base) { + ret = -ENOMEM; + dev_err(&pdev->dev, + "[%s] Failed to ioremap LCLA 0x%x-0x%x\n", + __func__, res->start, res->end); + goto failure; + } + + spin_lock_init(&base->lcla_pool.lock); + + base->lcla_pool.num_blocks = base->num_phy_chans; + + base->irq = platform_get_irq(pdev, 0); + + ret = request_irq(base->irq, d40_handle_interrupt, 0, D40_NAME, base); + + if (ret) { + dev_err(&pdev->dev, "[%s] No IRQ defined\n", __func__); + goto failure; + } + + err = d40_dmaengine_init(base, num_reserved_chans); + if (err) + goto failure; + + d40_hw_init(base); + + dev_info(base->dev, "initialized\n"); + return 0; + +failure: + if (base) { + if (base->virtbase) + iounmap(base->virtbase); + if (base->lcla_pool.phy) + release_mem_region(base->lcla_pool.phy, + base->lcla_pool.base_size); + if (base->phy_lcpa) + release_mem_region(base->phy_lcpa, + base->lcpa_size); + if (base->phy_start) + release_mem_region(base->phy_start, + base->phy_size); + if (base->clk) { + clk_disable(base->clk); + clk_put(base->clk); + } + + kfree(base->lcla_pool.alloc_map); + kfree(base->lookup_log_chans); + kfree(base->lookup_phy_chans); + kfree(base->phy_res); + kfree(base); + } + + dev_err(&pdev->dev, "[%s] probe failed\n", __func__); + return ret; +} + +static struct platform_driver d40_driver = { + .driver = { + .owner = THIS_MODULE, + .name = D40_NAME, + }, +}; + +int __init stedma40_init(void) +{ + return platform_driver_probe(&d40_driver, d40_probe); +} +arch_initcall(stedma40_init); |