From f20136eb03a1dbdfb04f3c62fd11c0d02d02b726 Mon Sep 17 00:00:00 2001 From: Cyril Chemparathy Date: Wed, 15 Sep 2010 10:11:21 -0400 Subject: net: davinci_emac: separate out davinci mdio Davinci's MDIO controller is present on other TI devices, without an accompanying EMAC. For example, on tnetv107x, the same MDIO module is used in conjunction with a 3-port switch hardware. By separating the MDIO controller code into its own platform driver, this patch allows common logic to be reused on such platforms. Signed-off-by: Cyril Chemparathy Tested-by: Michael Williamson Tested-by: Caglar Akyuz Signed-off-by: Kevin Hilman --- drivers/net/Kconfig | 10 ++++++++++ 1 file changed, 10 insertions(+) (limited to 'drivers/net/Kconfig') diff --git a/drivers/net/Kconfig b/drivers/net/Kconfig index 2cc81a54cbf3..c5c86e0e14a1 100644 --- a/drivers/net/Kconfig +++ b/drivers/net/Kconfig @@ -958,6 +958,16 @@ config TI_DAVINCI_EMAC To compile this driver as a module, choose M here: the module will be called davinci_emac_driver. This is recommended. +config TI_DAVINCI_MDIO + tristate "TI DaVinci MDIO Support" + depends on ARM && ( ARCH_DAVINCI || ARCH_OMAP3 ) + select PHYLIB + help + This driver supports TI's DaVinci MDIO module. + + To compile this driver as a module, choose M here: the module + will be called davinci_mdio. This is recommended. + config DM9000 tristate "DM9000 support" depends on ARM || BLACKFIN || MIPS -- cgit v1.2.3-58-ga151 From 5d69e0076a726588265af040b21ac3f8266856d1 Mon Sep 17 00:00:00 2001 From: Cyril Chemparathy Date: Wed, 15 Sep 2010 10:11:24 -0400 Subject: net: davinci_emac: switch to new mdio This patch switches the emac implementation over to the newly separated MDIO driver. With this, the mdio bus frequency defaults to a safe 2.2MHz. Boards may optionally specify a bus frequency via platform data. The phy identification scheme has been modified to use a phy bus id instead of a mask. This largely serves to eliminate the "phy search" code in emac init. Signed-off-by: Cyril Chemparathy Acked-by: David S. Miller Tested-by: Michael Williamson Tested-by: Caglar Akyuz Signed-off-by: Kevin Hilman --- drivers/net/Kconfig | 1 + drivers/net/davinci_emac.c | 88 +++++++++++++++----------------------------- include/linux/davinci_emac.h | 9 +++++ 3 files changed, 40 insertions(+), 58 deletions(-) (limited to 'drivers/net/Kconfig') diff --git a/drivers/net/Kconfig b/drivers/net/Kconfig index c5c86e0e14a1..911e7f148107 100644 --- a/drivers/net/Kconfig +++ b/drivers/net/Kconfig @@ -951,6 +951,7 @@ config NET_NETX config TI_DAVINCI_EMAC tristate "TI DaVinci EMAC Support" depends on ARM && ( ARCH_DAVINCI || ARCH_OMAP3 ) + select TI_DAVINCI_MDIO select PHYLIB help This driver supports TI's DaVinci Ethernet . diff --git a/drivers/net/davinci_emac.c b/drivers/net/davinci_emac.c index 7fbd052ddb0a..997f5995fce1 100644 --- a/drivers/net/davinci_emac.c +++ b/drivers/net/davinci_emac.c @@ -500,6 +500,7 @@ struct emac_priv { u32 phy_mask; /* mii_bus,phy members */ struct mii_bus *mii_bus; + const char *phy_id; struct phy_device *phydev; spinlock_t lock; /*platform specific members*/ @@ -686,7 +687,7 @@ static int emac_get_settings(struct net_device *ndev, struct ethtool_cmd *ecmd) { struct emac_priv *priv = netdev_priv(ndev); - if (priv->phy_mask) + if (priv->phydev) return phy_ethtool_gset(priv->phydev, ecmd); else return -EOPNOTSUPP; @@ -704,7 +705,7 @@ static int emac_get_settings(struct net_device *ndev, static int emac_set_settings(struct net_device *ndev, struct ethtool_cmd *ecmd) { struct emac_priv *priv = netdev_priv(ndev); - if (priv->phy_mask) + if (priv->phydev) return phy_ethtool_sset(priv->phydev, ecmd); else return -EOPNOTSUPP; @@ -841,7 +842,7 @@ static void emac_update_phystatus(struct emac_priv *priv) mac_control = emac_read(EMAC_MACCONTROL); cur_duplex = (mac_control & EMAC_MACCONTROL_FULLDUPLEXEN) ? DUPLEX_FULL : DUPLEX_HALF; - if (priv->phy_mask) + if (priv->phydev) new_duplex = priv->phydev->duplex; else new_duplex = DUPLEX_FULL; @@ -2485,6 +2486,11 @@ static int emac_devioctl(struct net_device *ndev, struct ifreq *ifrq, int cmd) return -EOPNOTSUPP; } +static int match_first_device(struct device *dev, void *data) +{ + return 1; +} + /** * emac_dev_open: EMAC device open * @ndev: The DaVinci EMAC network adapter @@ -2499,7 +2505,6 @@ static int emac_dev_open(struct net_device *ndev) { struct device *emac_dev = &ndev->dev; u32 rc, cnt, ch; - int phy_addr; struct resource *res; int q, m; int i = 0; @@ -2560,28 +2565,26 @@ static int emac_dev_open(struct net_device *ndev) emac_set_coalesce(ndev, &coal); } - /* find the first phy */ priv->phydev = NULL; - if (priv->phy_mask) { - emac_mii_reset(priv->mii_bus); - for (phy_addr = 0; phy_addr < PHY_MAX_ADDR; phy_addr++) { - if (priv->mii_bus->phy_map[phy_addr]) { - priv->phydev = priv->mii_bus->phy_map[phy_addr]; - break; - } - } + /* use the first phy on the bus if pdata did not give us a phy id */ + if (!priv->phy_id) { + struct device *phy; - if (!priv->phydev) { - printk(KERN_ERR "%s: no PHY found\n", ndev->name); - return -1; - } + phy = bus_find_device(&mdio_bus_type, NULL, NULL, + match_first_device); + if (phy) + priv->phy_id = dev_name(phy); + } - priv->phydev = phy_connect(ndev, dev_name(&priv->phydev->dev), - &emac_adjust_link, 0, PHY_INTERFACE_MODE_MII); + if (priv->phy_id && *priv->phy_id) { + priv->phydev = phy_connect(ndev, priv->phy_id, + &emac_adjust_link, 0, + PHY_INTERFACE_MODE_MII); if (IS_ERR(priv->phydev)) { - printk(KERN_ERR "%s: Could not attach to PHY\n", - ndev->name); + dev_err(emac_dev, "could not connect to phy %s\n", + priv->phy_id); + priv->phydev = NULL; return PTR_ERR(priv->phydev); } @@ -2589,12 +2592,13 @@ static int emac_dev_open(struct net_device *ndev) priv->speed = 0; priv->duplex = ~0; - printk(KERN_INFO "%s: attached PHY driver [%s] " - "(mii_bus:phy_addr=%s, id=%x)\n", ndev->name, + dev_info(emac_dev, "attached PHY driver [%s] " + "(mii_bus:phy_addr=%s, id=%x)\n", priv->phydev->drv->name, dev_name(&priv->phydev->dev), priv->phydev->phy_id); - } else{ + } else { /* No PHY , fix the link, speed and duplex settings */ + dev_notice(emac_dev, "no phy, defaulting to 100/full\n"); priv->link = 1; priv->speed = SPEED_100; priv->duplex = DUPLEX_FULL; @@ -2607,7 +2611,7 @@ static int emac_dev_open(struct net_device *ndev) if (netif_msg_drv(priv)) dev_notice(emac_dev, "DaVinci EMAC: Opened %s\n", ndev->name); - if (priv->phy_mask) + if (priv->phydev) phy_start(priv->phydev); return 0; @@ -2794,7 +2798,7 @@ static int __devinit davinci_emac_probe(struct platform_device *pdev) /* MAC addr and PHY mask , RMII enable info from platform_data */ memcpy(priv->mac_addr, pdata->mac_addr, 6); - priv->phy_mask = pdata->phy_mask; + priv->phy_id = pdata->phy_id; priv->rmii_en = pdata->rmii_en; priv->version = pdata->version; priv->int_enable = pdata->interrupt_enable; @@ -2871,32 +2875,6 @@ static int __devinit davinci_emac_probe(struct platform_device *pdev) } - /* MII/Phy intialisation, mdio bus registration */ - emac_mii = mdiobus_alloc(); - if (emac_mii == NULL) { - dev_err(emac_dev, "DaVinci EMAC: Error allocating mii_bus\n"); - rc = -ENOMEM; - goto mdio_alloc_err; - } - - priv->mii_bus = emac_mii; - emac_mii->name = "emac-mii", - emac_mii->read = emac_mii_read, - emac_mii->write = emac_mii_write, - emac_mii->reset = emac_mii_reset, - emac_mii->irq = mii_irqs, - emac_mii->phy_mask = ~(priv->phy_mask); - emac_mii->parent = &pdev->dev; - emac_mii->priv = priv->remap_addr + pdata->mdio_reg_offset; - snprintf(priv->mii_bus->id, MII_BUS_ID_SIZE, "%x", priv->pdev->id); - mdio_max_freq = pdata->mdio_max_freq; - emac_mii->reset(emac_mii); - - /* Register the MII bus */ - rc = mdiobus_register(emac_mii); - if (rc) - goto mdiobus_quit; - if (netif_msg_probe(priv)) { dev_notice(emac_dev, "DaVinci EMAC Probe found device "\ "(regs: %p, irq: %d)\n", @@ -2904,11 +2882,7 @@ static int __devinit davinci_emac_probe(struct platform_device *pdev) } return 0; -mdiobus_quit: - mdiobus_free(emac_mii); - netdev_reg_err: -mdio_alloc_err: clk_disable(emac_clk); no_irq_res: res = platform_get_resource(pdev, IORESOURCE_MEM, 0); @@ -2938,8 +2912,6 @@ static int __devexit davinci_emac_remove(struct platform_device *pdev) platform_set_drvdata(pdev, NULL); res = platform_get_resource(pdev, IORESOURCE_MEM, 0); - mdiobus_unregister(priv->mii_bus); - mdiobus_free(priv->mii_bus); release_mem_region(res->start, res->end - res->start + 1); diff --git a/include/linux/davinci_emac.h b/include/linux/davinci_emac.h index a04fd8c9fbdf..46a759f0c082 100644 --- a/include/linux/davinci_emac.h +++ b/include/linux/davinci_emac.h @@ -28,6 +28,15 @@ struct emac_platform_data { u32 ctrl_ram_size; u32 phy_mask; u32 mdio_max_freq; + + /* + * phy_id can be one of the following: + * - NULL : use the first phy on the bus, + * - "" : force to 100/full, no mdio control + * - ":" : use the specified bus and phy + */ + const char *phy_id; + u8 rmii_en; u8 version; void (*interrupt_enable) (void); -- cgit v1.2.3-58-ga151 From ef8c2dab01b6e30c4b2ca3ea3b8db33430493589 Mon Sep 17 00:00:00 2001 From: Cyril Chemparathy Date: Wed, 15 Sep 2010 10:11:28 -0400 Subject: net: davinci_emac: separate out cpdma code In addition to being embedded into the EMAC controller, the CPDMA hardware block is used in TI's CPSW switch controller. Fortunately, the programming interface to this hardware block remains pretty nicely consistent across these devices. This patch adds a new CPDMA services layer, which can then be reused across EMAC and CPSW drivers. Signed-off-by: Cyril Chemparathy Tested-by: Michael Williamson Tested-by: Caglar Akyuz Signed-off-by: Kevin Hilman --- drivers/net/Kconfig | 10 + drivers/net/Makefile | 1 + drivers/net/davinci_cpdma.c | 965 ++++++++++++++++++++++++++++++++++++++++++++ drivers/net/davinci_cpdma.h | 108 +++++ 4 files changed, 1084 insertions(+) create mode 100644 drivers/net/davinci_cpdma.c create mode 100644 drivers/net/davinci_cpdma.h (limited to 'drivers/net/Kconfig') diff --git a/drivers/net/Kconfig b/drivers/net/Kconfig index 911e7f148107..775fd8797c2a 100644 --- a/drivers/net/Kconfig +++ b/drivers/net/Kconfig @@ -952,6 +952,7 @@ config TI_DAVINCI_EMAC tristate "TI DaVinci EMAC Support" depends on ARM && ( ARCH_DAVINCI || ARCH_OMAP3 ) select TI_DAVINCI_MDIO + select TI_DAVINCI_CPDMA select PHYLIB help This driver supports TI's DaVinci Ethernet . @@ -969,6 +970,15 @@ config TI_DAVINCI_MDIO To compile this driver as a module, choose M here: the module will be called davinci_mdio. This is recommended. +config TI_DAVINCI_CPDMA + tristate "TI DaVinci CPDMA Support" + depends on ARM && ( ARCH_DAVINCI || ARCH_OMAP3 ) + help + This driver supports TI's DaVinci CPDMA dma engine. + + To compile this driver as a module, choose M here: the module + will be called davinci_cpdma. This is recommended. + config DM9000 tristate "DM9000 support" depends on ARM || BLACKFIN || MIPS diff --git a/drivers/net/Makefile b/drivers/net/Makefile index d38a7aba179c..65da885a3c0c 100644 --- a/drivers/net/Makefile +++ b/drivers/net/Makefile @@ -8,6 +8,7 @@ obj-$(CONFIG_PHYLIB) += phy/ obj-$(CONFIG_TI_DAVINCI_EMAC) += davinci_emac.o obj-$(CONFIG_TI_DAVINCI_MDIO) += davinci_mdio.o +obj-$(CONFIG_TI_DAVINCI_CPDMA) += davinci_cpdma.o obj-$(CONFIG_E1000) += e1000/ obj-$(CONFIG_E1000E) += e1000e/ diff --git a/drivers/net/davinci_cpdma.c b/drivers/net/davinci_cpdma.c new file mode 100644 index 000000000000..e92b2b6cd8c4 --- /dev/null +++ b/drivers/net/davinci_cpdma.c @@ -0,0 +1,965 @@ +/* + * Texas Instruments CPDMA Driver + * + * Copyright (C) 2010 Texas Instruments + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License as + * published by the Free Software Foundation version 2. + * + * This program is distributed "as is" WITHOUT ANY WARRANTY of any + * kind, whether express or implied; without even the implied warranty + * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + */ +#include +#include +#include +#include +#include +#include +#include + +#include "davinci_cpdma.h" + +/* DMA Registers */ +#define CPDMA_TXIDVER 0x00 +#define CPDMA_TXCONTROL 0x04 +#define CPDMA_TXTEARDOWN 0x08 +#define CPDMA_RXIDVER 0x10 +#define CPDMA_RXCONTROL 0x14 +#define CPDMA_SOFTRESET 0x1c +#define CPDMA_RXTEARDOWN 0x18 +#define CPDMA_TXINTSTATRAW 0x80 +#define CPDMA_TXINTSTATMASKED 0x84 +#define CPDMA_TXINTMASKSET 0x88 +#define CPDMA_TXINTMASKCLEAR 0x8c +#define CPDMA_MACINVECTOR 0x90 +#define CPDMA_MACEOIVECTOR 0x94 +#define CPDMA_RXINTSTATRAW 0xa0 +#define CPDMA_RXINTSTATMASKED 0xa4 +#define CPDMA_RXINTMASKSET 0xa8 +#define CPDMA_RXINTMASKCLEAR 0xac +#define CPDMA_DMAINTSTATRAW 0xb0 +#define CPDMA_DMAINTSTATMASKED 0xb4 +#define CPDMA_DMAINTMASKSET 0xb8 +#define CPDMA_DMAINTMASKCLEAR 0xbc +#define CPDMA_DMAINT_HOSTERR BIT(1) + +/* the following exist only if has_ext_regs is set */ +#define CPDMA_DMACONTROL 0x20 +#define CPDMA_DMASTATUS 0x24 +#define CPDMA_RXBUFFOFS 0x28 +#define CPDMA_EM_CONTROL 0x2c + +/* Descriptor mode bits */ +#define CPDMA_DESC_SOP BIT(31) +#define CPDMA_DESC_EOP BIT(30) +#define CPDMA_DESC_OWNER BIT(29) +#define CPDMA_DESC_EOQ BIT(28) +#define CPDMA_DESC_TD_COMPLETE BIT(27) +#define CPDMA_DESC_PASS_CRC BIT(26) + +#define CPDMA_TEARDOWN_VALUE 0xfffffffc + +struct cpdma_desc { + /* hardware fields */ + u32 hw_next; + u32 hw_buffer; + u32 hw_len; + u32 hw_mode; + /* software fields */ + void *sw_token; + u32 sw_buffer; + u32 sw_len; +}; + +struct cpdma_desc_pool { + u32 phys; + void __iomem *iomap; /* ioremap map */ + void *cpumap; /* dma_alloc map */ + int desc_size, mem_size; + int num_desc, used_desc; + unsigned long *bitmap; + struct device *dev; + spinlock_t lock; +}; + +enum cpdma_state { + CPDMA_STATE_IDLE, + CPDMA_STATE_ACTIVE, + CPDMA_STATE_TEARDOWN, +}; + +const char *cpdma_state_str[] = { "idle", "active", "teardown" }; + +struct cpdma_ctlr { + enum cpdma_state state; + struct cpdma_params params; + struct device *dev; + struct cpdma_desc_pool *pool; + spinlock_t lock; + struct cpdma_chan *channels[2 * CPDMA_MAX_CHANNELS]; +}; + +struct cpdma_chan { + enum cpdma_state state; + struct cpdma_ctlr *ctlr; + int chan_num; + spinlock_t lock; + struct cpdma_desc __iomem *head, *tail; + int count; + void __iomem *hdp, *cp, *rxfree; + u32 mask; + cpdma_handler_fn handler; + enum dma_data_direction dir; + struct cpdma_chan_stats stats; + /* offsets into dmaregs */ + int int_set, int_clear, td; +}; + +/* The following make access to common cpdma_ctlr params more readable */ +#define dmaregs params.dmaregs +#define num_chan params.num_chan + +/* various accessors */ +#define dma_reg_read(ctlr, ofs) __raw_readl((ctlr)->dmaregs + (ofs)) +#define chan_read(chan, fld) __raw_readl((chan)->fld) +#define desc_read(desc, fld) __raw_readl(&(desc)->fld) +#define dma_reg_write(ctlr, ofs, v) __raw_writel(v, (ctlr)->dmaregs + (ofs)) +#define chan_write(chan, fld, v) __raw_writel(v, (chan)->fld) +#define desc_write(desc, fld, v) __raw_writel((u32)(v), &(desc)->fld) + +/* + * Utility constructs for a cpdma descriptor pool. Some devices (e.g. davinci + * emac) have dedicated on-chip memory for these descriptors. Some other + * devices (e.g. cpsw switches) use plain old memory. Descriptor pools + * abstract out these details + */ +static struct cpdma_desc_pool * +cpdma_desc_pool_create(struct device *dev, u32 phys, int size, int align) +{ + int bitmap_size; + struct cpdma_desc_pool *pool; + + pool = kzalloc(sizeof(*pool), GFP_KERNEL); + if (!pool) + return NULL; + + spin_lock_init(&pool->lock); + + pool->dev = dev; + pool->mem_size = size; + pool->desc_size = ALIGN(sizeof(struct cpdma_desc), align); + pool->num_desc = size / pool->desc_size; + + bitmap_size = (pool->num_desc / BITS_PER_LONG) * sizeof(long); + pool->bitmap = kzalloc(bitmap_size, GFP_KERNEL); + if (!pool->bitmap) + goto fail; + + if (phys) { + pool->phys = phys; + pool->iomap = ioremap(phys, size); + } else { + pool->cpumap = dma_alloc_coherent(dev, size, &pool->phys, + GFP_KERNEL); + pool->iomap = (void __force __iomem *)pool->cpumap; + } + + if (pool->iomap) + return pool; + +fail: + kfree(pool->bitmap); + kfree(pool); + return NULL; +} + +static void cpdma_desc_pool_destroy(struct cpdma_desc_pool *pool) +{ + unsigned long flags; + + if (!pool) + return; + + spin_lock_irqsave(&pool->lock, flags); + WARN_ON(pool->used_desc); + kfree(pool->bitmap); + if (pool->cpumap) { + dma_free_coherent(pool->dev, pool->mem_size, pool->cpumap, + pool->phys); + } else { + iounmap(pool->iomap); + } + spin_unlock_irqrestore(&pool->lock, flags); + kfree(pool); +} + +static inline dma_addr_t desc_phys(struct cpdma_desc_pool *pool, + struct cpdma_desc __iomem *desc) +{ + if (!desc) + return 0; + return pool->phys + (__force dma_addr_t)desc - + (__force dma_addr_t)pool->iomap; +} + +static inline struct cpdma_desc __iomem * +desc_from_phys(struct cpdma_desc_pool *pool, dma_addr_t dma) +{ + return dma ? pool->iomap + dma - pool->phys : NULL; +} + +static struct cpdma_desc __iomem * +cpdma_desc_alloc(struct cpdma_desc_pool *pool, int num_desc) +{ + unsigned long flags; + int index; + struct cpdma_desc __iomem *desc = NULL; + + spin_lock_irqsave(&pool->lock, flags); + + index = bitmap_find_next_zero_area(pool->bitmap, pool->num_desc, 0, + num_desc, 0); + if (index < pool->num_desc) { + bitmap_set(pool->bitmap, index, num_desc); + desc = pool->iomap + pool->desc_size * index; + pool->used_desc++; + } + + spin_unlock_irqrestore(&pool->lock, flags); + return desc; +} + +static void cpdma_desc_free(struct cpdma_desc_pool *pool, + struct cpdma_desc __iomem *desc, int num_desc) +{ + unsigned long flags, index; + + index = ((unsigned long)desc - (unsigned long)pool->iomap) / + pool->desc_size; + spin_lock_irqsave(&pool->lock, flags); + bitmap_clear(pool->bitmap, index, num_desc); + pool->used_desc--; + spin_unlock_irqrestore(&pool->lock, flags); +} + +struct cpdma_ctlr *cpdma_ctlr_create(struct cpdma_params *params) +{ + struct cpdma_ctlr *ctlr; + + ctlr = kzalloc(sizeof(*ctlr), GFP_KERNEL); + if (!ctlr) + return NULL; + + ctlr->state = CPDMA_STATE_IDLE; + ctlr->params = *params; + ctlr->dev = params->dev; + spin_lock_init(&ctlr->lock); + + ctlr->pool = cpdma_desc_pool_create(ctlr->dev, + ctlr->params.desc_mem_phys, + ctlr->params.desc_mem_size, + ctlr->params.desc_align); + if (!ctlr->pool) { + kfree(ctlr); + return NULL; + } + + if (WARN_ON(ctlr->num_chan > CPDMA_MAX_CHANNELS)) + ctlr->num_chan = CPDMA_MAX_CHANNELS; + return ctlr; +} + +int cpdma_ctlr_start(struct cpdma_ctlr *ctlr) +{ + unsigned long flags; + int i; + + spin_lock_irqsave(&ctlr->lock, flags); + if (ctlr->state != CPDMA_STATE_IDLE) { + spin_unlock_irqrestore(&ctlr->lock, flags); + return -EBUSY; + } + + if (ctlr->params.has_soft_reset) { + unsigned long timeout = jiffies + HZ/10; + + dma_reg_write(ctlr, CPDMA_SOFTRESET, 1); + while (time_before(jiffies, timeout)) { + if (dma_reg_read(ctlr, CPDMA_SOFTRESET) == 0) + break; + } + WARN_ON(!time_before(jiffies, timeout)); + } + + for (i = 0; i < ctlr->num_chan; i++) { + __raw_writel(0, ctlr->params.txhdp + 4 * i); + __raw_writel(0, ctlr->params.rxhdp + 4 * i); + __raw_writel(0, ctlr->params.txcp + 4 * i); + __raw_writel(0, ctlr->params.rxcp + 4 * i); + } + + dma_reg_write(ctlr, CPDMA_RXINTMASKCLEAR, 0xffffffff); + dma_reg_write(ctlr, CPDMA_TXINTMASKCLEAR, 0xffffffff); + + dma_reg_write(ctlr, CPDMA_TXCONTROL, 1); + dma_reg_write(ctlr, CPDMA_RXCONTROL, 1); + + ctlr->state = CPDMA_STATE_ACTIVE; + + for (i = 0; i < ARRAY_SIZE(ctlr->channels); i++) { + if (ctlr->channels[i]) + cpdma_chan_start(ctlr->channels[i]); + } + spin_unlock_irqrestore(&ctlr->lock, flags); + return 0; +} + +int cpdma_ctlr_stop(struct cpdma_ctlr *ctlr) +{ + unsigned long flags; + int i; + + spin_lock_irqsave(&ctlr->lock, flags); + if (ctlr->state != CPDMA_STATE_ACTIVE) { + spin_unlock_irqrestore(&ctlr->lock, flags); + return -EINVAL; + } + + ctlr->state = CPDMA_STATE_TEARDOWN; + + for (i = 0; i < ARRAY_SIZE(ctlr->channels); i++) { + if (ctlr->channels[i]) + cpdma_chan_stop(ctlr->channels[i]); + } + + dma_reg_write(ctlr, CPDMA_RXINTMASKCLEAR, 0xffffffff); + dma_reg_write(ctlr, CPDMA_TXINTMASKCLEAR, 0xffffffff); + + dma_reg_write(ctlr, CPDMA_TXCONTROL, 0); + dma_reg_write(ctlr, CPDMA_RXCONTROL, 0); + + ctlr->state = CPDMA_STATE_IDLE; + + spin_unlock_irqrestore(&ctlr->lock, flags); + return 0; +} + +int cpdma_ctlr_dump(struct cpdma_ctlr *ctlr) +{ + struct device *dev = ctlr->dev; + unsigned long flags; + int i; + + spin_lock_irqsave(&ctlr->lock, flags); + + dev_info(dev, "CPDMA: state: %s", cpdma_state_str[ctlr->state]); + + dev_info(dev, "CPDMA: txidver: %x", + dma_reg_read(ctlr, CPDMA_TXIDVER)); + dev_info(dev, "CPDMA: txcontrol: %x", + dma_reg_read(ctlr, CPDMA_TXCONTROL)); + dev_info(dev, "CPDMA: txteardown: %x", + dma_reg_read(ctlr, CPDMA_TXTEARDOWN)); + dev_info(dev, "CPDMA: rxidver: %x", + dma_reg_read(ctlr, CPDMA_RXIDVER)); + dev_info(dev, "CPDMA: rxcontrol: %x", + dma_reg_read(ctlr, CPDMA_RXCONTROL)); + dev_info(dev, "CPDMA: softreset: %x", + dma_reg_read(ctlr, CPDMA_SOFTRESET)); + dev_info(dev, "CPDMA: rxteardown: %x", + dma_reg_read(ctlr, CPDMA_RXTEARDOWN)); + dev_info(dev, "CPDMA: txintstatraw: %x", + dma_reg_read(ctlr, CPDMA_TXINTSTATRAW)); + dev_info(dev, "CPDMA: txintstatmasked: %x", + dma_reg_read(ctlr, CPDMA_TXINTSTATMASKED)); + dev_info(dev, "CPDMA: txintmaskset: %x", + dma_reg_read(ctlr, CPDMA_TXINTMASKSET)); + dev_info(dev, "CPDMA: txintmaskclear: %x", + dma_reg_read(ctlr, CPDMA_TXINTMASKCLEAR)); + dev_info(dev, "CPDMA: macinvector: %x", + dma_reg_read(ctlr, CPDMA_MACINVECTOR)); + dev_info(dev, "CPDMA: maceoivector: %x", + dma_reg_read(ctlr, CPDMA_MACEOIVECTOR)); + dev_info(dev, "CPDMA: rxintstatraw: %x", + dma_reg_read(ctlr, CPDMA_RXINTSTATRAW)); + dev_info(dev, "CPDMA: rxintstatmasked: %x", + dma_reg_read(ctlr, CPDMA_RXINTSTATMASKED)); + dev_info(dev, "CPDMA: rxintmaskset: %x", + dma_reg_read(ctlr, CPDMA_RXINTMASKSET)); + dev_info(dev, "CPDMA: rxintmaskclear: %x", + dma_reg_read(ctlr, CPDMA_RXINTMASKCLEAR)); + dev_info(dev, "CPDMA: dmaintstatraw: %x", + dma_reg_read(ctlr, CPDMA_DMAINTSTATRAW)); + dev_info(dev, "CPDMA: dmaintstatmasked: %x", + dma_reg_read(ctlr, CPDMA_DMAINTSTATMASKED)); + dev_info(dev, "CPDMA: dmaintmaskset: %x", + dma_reg_read(ctlr, CPDMA_DMAINTMASKSET)); + dev_info(dev, "CPDMA: dmaintmaskclear: %x", + dma_reg_read(ctlr, CPDMA_DMAINTMASKCLEAR)); + + if (!ctlr->params.has_ext_regs) { + dev_info(dev, "CPDMA: dmacontrol: %x", + dma_reg_read(ctlr, CPDMA_DMACONTROL)); + dev_info(dev, "CPDMA: dmastatus: %x", + dma_reg_read(ctlr, CPDMA_DMASTATUS)); + dev_info(dev, "CPDMA: rxbuffofs: %x", + dma_reg_read(ctlr, CPDMA_RXBUFFOFS)); + } + + for (i = 0; i < ARRAY_SIZE(ctlr->channels); i++) + if (ctlr->channels[i]) + cpdma_chan_dump(ctlr->channels[i]); + + spin_unlock_irqrestore(&ctlr->lock, flags); + return 0; +} + +int cpdma_ctlr_destroy(struct cpdma_ctlr *ctlr) +{ + unsigned long flags; + int ret = 0, i; + + if (!ctlr) + return -EINVAL; + + spin_lock_irqsave(&ctlr->lock, flags); + if (ctlr->state != CPDMA_STATE_IDLE) + cpdma_ctlr_stop(ctlr); + + for (i = 0; i < ARRAY_SIZE(ctlr->channels); i++) { + if (ctlr->channels[i]) + cpdma_chan_destroy(ctlr->channels[i]); + } + + cpdma_desc_pool_destroy(ctlr->pool); + spin_unlock_irqrestore(&ctlr->lock, flags); + kfree(ctlr); + return ret; +} + +int cpdma_ctlr_int_ctrl(struct cpdma_ctlr *ctlr, bool enable) +{ + unsigned long flags; + int i, reg; + + spin_lock_irqsave(&ctlr->lock, flags); + if (ctlr->state != CPDMA_STATE_ACTIVE) { + spin_unlock_irqrestore(&ctlr->lock, flags); + return -EINVAL; + } + + reg = enable ? CPDMA_DMAINTMASKSET : CPDMA_DMAINTMASKCLEAR; + dma_reg_write(ctlr, reg, CPDMA_DMAINT_HOSTERR); + + for (i = 0; i < ARRAY_SIZE(ctlr->channels); i++) { + if (ctlr->channels[i]) + cpdma_chan_int_ctrl(ctlr->channels[i], enable); + } + + spin_unlock_irqrestore(&ctlr->lock, flags); + return 0; +} + +void cpdma_ctlr_eoi(struct cpdma_ctlr *ctlr) +{ + dma_reg_write(ctlr, CPDMA_MACEOIVECTOR, 0); +} + +struct cpdma_chan *cpdma_chan_create(struct cpdma_ctlr *ctlr, int chan_num, + cpdma_handler_fn handler) +{ + struct cpdma_chan *chan; + int ret, offset = (chan_num % CPDMA_MAX_CHANNELS) * 4; + unsigned long flags; + + if (__chan_linear(chan_num) >= ctlr->num_chan) + return NULL; + + ret = -ENOMEM; + chan = kzalloc(sizeof(*chan), GFP_KERNEL); + if (!chan) + goto err_chan_alloc; + + spin_lock_irqsave(&ctlr->lock, flags); + ret = -EBUSY; + if (ctlr->channels[chan_num]) + goto err_chan_busy; + + chan->ctlr = ctlr; + chan->state = CPDMA_STATE_IDLE; + chan->chan_num = chan_num; + chan->handler = handler; + + if (is_rx_chan(chan)) { + chan->hdp = ctlr->params.rxhdp + offset; + chan->cp = ctlr->params.rxcp + offset; + chan->rxfree = ctlr->params.rxfree + offset; + chan->int_set = CPDMA_RXINTMASKSET; + chan->int_clear = CPDMA_RXINTMASKCLEAR; + chan->td = CPDMA_RXTEARDOWN; + chan->dir = DMA_FROM_DEVICE; + } else { + chan->hdp = ctlr->params.txhdp + offset; + chan->cp = ctlr->params.txcp + offset; + chan->int_set = CPDMA_TXINTMASKSET; + chan->int_clear = CPDMA_TXINTMASKCLEAR; + chan->td = CPDMA_TXTEARDOWN; + chan->dir = DMA_TO_DEVICE; + } + chan->mask = BIT(chan_linear(chan)); + + spin_lock_init(&chan->lock); + + ctlr->channels[chan_num] = chan; + spin_unlock_irqrestore(&ctlr->lock, flags); + return chan; + +err_chan_busy: + spin_unlock_irqrestore(&ctlr->lock, flags); + kfree(chan); +err_chan_alloc: + return ERR_PTR(ret); +} + +int cpdma_chan_destroy(struct cpdma_chan *chan) +{ + struct cpdma_ctlr *ctlr = chan->ctlr; + unsigned long flags; + + if (!chan) + return -EINVAL; + + spin_lock_irqsave(&ctlr->lock, flags); + if (chan->state != CPDMA_STATE_IDLE) + cpdma_chan_stop(chan); + ctlr->channels[chan->chan_num] = NULL; + spin_unlock_irqrestore(&ctlr->lock, flags); + kfree(chan); + return 0; +} + +int cpdma_chan_get_stats(struct cpdma_chan *chan, + struct cpdma_chan_stats *stats) +{ + unsigned long flags; + if (!chan) + return -EINVAL; + spin_lock_irqsave(&chan->lock, flags); + memcpy(stats, &chan->stats, sizeof(*stats)); + spin_unlock_irqrestore(&chan->lock, flags); + return 0; +} + +int cpdma_chan_dump(struct cpdma_chan *chan) +{ + unsigned long flags; + struct device *dev = chan->ctlr->dev; + + spin_lock_irqsave(&chan->lock, flags); + + dev_info(dev, "channel %d (%s %d) state %s", + chan->chan_num, is_rx_chan(chan) ? "rx" : "tx", + chan_linear(chan), cpdma_state_str[chan->state]); + dev_info(dev, "\thdp: %x\n", chan_read(chan, hdp)); + dev_info(dev, "\tcp: %x\n", chan_read(chan, cp)); + if (chan->rxfree) { + dev_info(dev, "\trxfree: %x\n", + chan_read(chan, rxfree)); + } + + dev_info(dev, "\tstats head_enqueue: %d\n", + chan->stats.head_enqueue); + dev_info(dev, "\tstats tail_enqueue: %d\n", + chan->stats.tail_enqueue); + dev_info(dev, "\tstats pad_enqueue: %d\n", + chan->stats.pad_enqueue); + dev_info(dev, "\tstats misqueued: %d\n", + chan->stats.misqueued); + dev_info(dev, "\tstats desc_alloc_fail: %d\n", + chan->stats.desc_alloc_fail); + dev_info(dev, "\tstats pad_alloc_fail: %d\n", + chan->stats.pad_alloc_fail); + dev_info(dev, "\tstats runt_receive_buff: %d\n", + chan->stats.runt_receive_buff); + dev_info(dev, "\tstats runt_transmit_buff: %d\n", + chan->stats.runt_transmit_buff); + dev_info(dev, "\tstats empty_dequeue: %d\n", + chan->stats.empty_dequeue); + dev_info(dev, "\tstats busy_dequeue: %d\n", + chan->stats.busy_dequeue); + dev_info(dev, "\tstats good_dequeue: %d\n", + chan->stats.good_dequeue); + dev_info(dev, "\tstats requeue: %d\n", + chan->stats.requeue); + dev_info(dev, "\tstats teardown_dequeue: %d\n", + chan->stats.teardown_dequeue); + + spin_unlock_irqrestore(&chan->lock, flags); + return 0; +} + +static void __cpdma_chan_submit(struct cpdma_chan *chan, + struct cpdma_desc __iomem *desc) +{ + struct cpdma_ctlr *ctlr = chan->ctlr; + struct cpdma_desc __iomem *prev = chan->tail; + struct cpdma_desc_pool *pool = ctlr->pool; + dma_addr_t desc_dma; + u32 mode; + + desc_dma = desc_phys(pool, desc); + + /* simple case - idle channel */ + if (!chan->head) { + chan->stats.head_enqueue++; + chan->head = desc; + chan->tail = desc; + if (chan->state == CPDMA_STATE_ACTIVE) + chan_write(chan, hdp, desc_dma); + return; + } + + /* first chain the descriptor at the tail of the list */ + desc_write(prev, hw_next, desc_dma); + chan->tail = desc; + chan->stats.tail_enqueue++; + + /* next check if EOQ has been triggered already */ + mode = desc_read(prev, hw_mode); + if (((mode & (CPDMA_DESC_EOQ | CPDMA_DESC_OWNER)) == CPDMA_DESC_EOQ) && + (chan->state == CPDMA_STATE_ACTIVE)) { + desc_write(prev, hw_mode, mode & ~CPDMA_DESC_EOQ); + chan_write(chan, hdp, desc_dma); + chan->stats.misqueued++; + } +} + +int cpdma_chan_submit(struct cpdma_chan *chan, void *token, void *data, + int len, gfp_t gfp_mask) +{ + struct cpdma_ctlr *ctlr = chan->ctlr; + struct cpdma_desc __iomem *desc; + dma_addr_t buffer; + unsigned long flags; + u32 mode; + int ret = 0; + + spin_lock_irqsave(&chan->lock, flags); + + if (chan->state == CPDMA_STATE_TEARDOWN) { + ret = -EINVAL; + goto unlock_ret; + } + + desc = cpdma_desc_alloc(ctlr->pool, 1); + if (!desc) { + chan->stats.desc_alloc_fail++; + ret = -ENOMEM; + goto unlock_ret; + } + + if (len < ctlr->params.min_packet_size) { + len = ctlr->params.min_packet_size; + chan->stats.runt_transmit_buff++; + } + + buffer = dma_map_single(ctlr->dev, data, len, chan->dir); + mode = CPDMA_DESC_OWNER | CPDMA_DESC_SOP | CPDMA_DESC_EOP; + + desc_write(desc, hw_next, 0); + desc_write(desc, hw_buffer, buffer); + desc_write(desc, hw_len, len); + desc_write(desc, hw_mode, mode | len); + desc_write(desc, sw_token, token); + desc_write(desc, sw_buffer, buffer); + desc_write(desc, sw_len, len); + + __cpdma_chan_submit(chan, desc); + + if (chan->state == CPDMA_STATE_ACTIVE && chan->rxfree) + chan_write(chan, rxfree, 1); + + chan->count++; + +unlock_ret: + spin_unlock_irqrestore(&chan->lock, flags); + return ret; +} + +static void __cpdma_chan_free(struct cpdma_chan *chan, + struct cpdma_desc __iomem *desc, + int outlen, int status) +{ + struct cpdma_ctlr *ctlr = chan->ctlr; + struct cpdma_desc_pool *pool = ctlr->pool; + dma_addr_t buff_dma; + int origlen; + void *token; + + token = (void *)desc_read(desc, sw_token); + buff_dma = desc_read(desc, sw_buffer); + origlen = desc_read(desc, sw_len); + + dma_unmap_single(ctlr->dev, buff_dma, origlen, chan->dir); + cpdma_desc_free(pool, desc, 1); + (*chan->handler)(token, outlen, status); +} + +static int __cpdma_chan_process(struct cpdma_chan *chan) +{ + struct cpdma_ctlr *ctlr = chan->ctlr; + struct cpdma_desc __iomem *desc; + int status, outlen; + struct cpdma_desc_pool *pool = ctlr->pool; + dma_addr_t desc_dma; + unsigned long flags; + + spin_lock_irqsave(&chan->lock, flags); + + desc = chan->head; + if (!desc) { + chan->stats.empty_dequeue++; + status = -ENOENT; + goto unlock_ret; + } + desc_dma = desc_phys(pool, desc); + + status = __raw_readl(&desc->hw_mode); + outlen = status & 0x7ff; + if (status & CPDMA_DESC_OWNER) { + chan->stats.busy_dequeue++; + status = -EBUSY; + goto unlock_ret; + } + status = status & (CPDMA_DESC_EOQ | CPDMA_DESC_TD_COMPLETE); + + chan->head = desc_from_phys(pool, desc_read(desc, hw_next)); + chan_write(chan, cp, desc_dma); + chan->count--; + chan->stats.good_dequeue++; + + if (status & CPDMA_DESC_EOQ) { + chan->stats.requeue++; + chan_write(chan, hdp, desc_phys(pool, chan->head)); + } + + spin_unlock_irqrestore(&chan->lock, flags); + + __cpdma_chan_free(chan, desc, outlen, status); + return status; + +unlock_ret: + spin_unlock_irqrestore(&chan->lock, flags); + return status; +} + +int cpdma_chan_process(struct cpdma_chan *chan, int quota) +{ + int used = 0, ret = 0; + + if (chan->state != CPDMA_STATE_ACTIVE) + return -EINVAL; + + while (used < quota) { + ret = __cpdma_chan_process(chan); + if (ret < 0) + break; + used++; + } + return used; +} + +int cpdma_chan_start(struct cpdma_chan *chan) +{ + struct cpdma_ctlr *ctlr = chan->ctlr; + struct cpdma_desc_pool *pool = ctlr->pool; + unsigned long flags; + + spin_lock_irqsave(&chan->lock, flags); + if (chan->state != CPDMA_STATE_IDLE) { + spin_unlock_irqrestore(&chan->lock, flags); + return -EBUSY; + } + if (ctlr->state != CPDMA_STATE_ACTIVE) { + spin_unlock_irqrestore(&chan->lock, flags); + return -EINVAL; + } + dma_reg_write(ctlr, chan->int_set, chan->mask); + chan->state = CPDMA_STATE_ACTIVE; + if (chan->head) { + chan_write(chan, hdp, desc_phys(pool, chan->head)); + if (chan->rxfree) + chan_write(chan, rxfree, chan->count); + } + + spin_unlock_irqrestore(&chan->lock, flags); + return 0; +} + +int cpdma_chan_stop(struct cpdma_chan *chan) +{ + struct cpdma_ctlr *ctlr = chan->ctlr; + struct cpdma_desc_pool *pool = ctlr->pool; + unsigned long flags; + int ret; + unsigned long timeout; + + spin_lock_irqsave(&chan->lock, flags); + if (chan->state != CPDMA_STATE_ACTIVE) { + spin_unlock_irqrestore(&chan->lock, flags); + return -EINVAL; + } + + chan->state = CPDMA_STATE_TEARDOWN; + dma_reg_write(ctlr, chan->int_clear, chan->mask); + + /* trigger teardown */ + dma_reg_write(ctlr, chan->td, chan->chan_num); + + /* wait for teardown complete */ + timeout = jiffies + HZ/10; /* 100 msec */ + while (time_before(jiffies, timeout)) { + u32 cp = chan_read(chan, cp); + if ((cp & CPDMA_TEARDOWN_VALUE) == CPDMA_TEARDOWN_VALUE) + break; + cpu_relax(); + } + WARN_ON(!time_before(jiffies, timeout)); + chan_write(chan, cp, CPDMA_TEARDOWN_VALUE); + + /* handle completed packets */ + do { + ret = __cpdma_chan_process(chan); + if (ret < 0) + break; + } while ((ret & CPDMA_DESC_TD_COMPLETE) == 0); + + /* remaining packets haven't been tx/rx'ed, clean them up */ + while (chan->head) { + struct cpdma_desc __iomem *desc = chan->head; + dma_addr_t next_dma; + + next_dma = desc_read(desc, hw_next); + chan->head = desc_from_phys(pool, next_dma); + chan->stats.teardown_dequeue++; + + /* issue callback without locks held */ + spin_unlock_irqrestore(&chan->lock, flags); + __cpdma_chan_free(chan, desc, 0, -ENOSYS); + spin_lock_irqsave(&chan->lock, flags); + } + + chan->state = CPDMA_STATE_IDLE; + spin_unlock_irqrestore(&chan->lock, flags); + return 0; +} + +int cpdma_chan_int_ctrl(struct cpdma_chan *chan, bool enable) +{ + unsigned long flags; + + spin_lock_irqsave(&chan->lock, flags); + if (chan->state != CPDMA_STATE_ACTIVE) { + spin_unlock_irqrestore(&chan->lock, flags); + return -EINVAL; + } + + dma_reg_write(chan->ctlr, enable ? chan->int_set : chan->int_clear, + chan->mask); + spin_unlock_irqrestore(&chan->lock, flags); + + return 0; +} + +struct cpdma_control_info { + u32 reg; + u32 shift, mask; + int access; +#define ACCESS_RO BIT(0) +#define ACCESS_WO BIT(1) +#define ACCESS_RW (ACCESS_RO | ACCESS_WO) +}; + +struct cpdma_control_info controls[] = { + [CPDMA_CMD_IDLE] = {CPDMA_DMACONTROL, 3, 1, ACCESS_WO}, + [CPDMA_COPY_ERROR_FRAMES] = {CPDMA_DMACONTROL, 4, 1, ACCESS_RW}, + [CPDMA_RX_OFF_LEN_UPDATE] = {CPDMA_DMACONTROL, 2, 1, ACCESS_RW}, + [CPDMA_RX_OWNERSHIP_FLIP] = {CPDMA_DMACONTROL, 1, 1, ACCESS_RW}, + [CPDMA_TX_PRIO_FIXED] = {CPDMA_DMACONTROL, 0, 1, ACCESS_RW}, + [CPDMA_STAT_IDLE] = {CPDMA_DMASTATUS, 31, 1, ACCESS_RO}, + [CPDMA_STAT_TX_ERR_CODE] = {CPDMA_DMASTATUS, 20, 0xf, ACCESS_RW}, + [CPDMA_STAT_TX_ERR_CHAN] = {CPDMA_DMASTATUS, 16, 0x7, ACCESS_RW}, + [CPDMA_STAT_RX_ERR_CODE] = {CPDMA_DMASTATUS, 12, 0xf, ACCESS_RW}, + [CPDMA_STAT_RX_ERR_CHAN] = {CPDMA_DMASTATUS, 8, 0x7, ACCESS_RW}, + [CPDMA_RX_BUFFER_OFFSET] = {CPDMA_RXBUFFOFS, 0, 0xffff, ACCESS_RW}, +}; + +int cpdma_control_get(struct cpdma_ctlr *ctlr, int control) +{ + unsigned long flags; + struct cpdma_control_info *info = &controls[control]; + int ret; + + spin_lock_irqsave(&ctlr->lock, flags); + + ret = -ENOTSUPP; + if (!ctlr->params.has_ext_regs) + goto unlock_ret; + + ret = -EINVAL; + if (ctlr->state != CPDMA_STATE_ACTIVE) + goto unlock_ret; + + ret = -ENOENT; + if (control < 0 || control >= ARRAY_SIZE(controls)) + goto unlock_ret; + + ret = -EPERM; + if ((info->access & ACCESS_RO) != ACCESS_RO) + goto unlock_ret; + + ret = (dma_reg_read(ctlr, info->reg) >> info->shift) & info->mask; + +unlock_ret: + spin_unlock_irqrestore(&ctlr->lock, flags); + return ret; +} + +int cpdma_control_set(struct cpdma_ctlr *ctlr, int control, int value) +{ + unsigned long flags; + struct cpdma_control_info *info = &controls[control]; + int ret; + u32 val; + + spin_lock_irqsave(&ctlr->lock, flags); + + ret = -ENOTSUPP; + if (!ctlr->params.has_ext_regs) + goto unlock_ret; + + ret = -EINVAL; + if (ctlr->state != CPDMA_STATE_ACTIVE) + goto unlock_ret; + + ret = -ENOENT; + if (control < 0 || control >= ARRAY_SIZE(controls)) + goto unlock_ret; + + ret = -EPERM; + if ((info->access & ACCESS_WO) != ACCESS_WO) + goto unlock_ret; + + val = dma_reg_read(ctlr, info->reg); + val &= ~(info->mask << info->shift); + val |= (value & info->mask) << info->shift; + dma_reg_write(ctlr, info->reg, val); + ret = 0; + +unlock_ret: + spin_unlock_irqrestore(&ctlr->lock, flags); + return ret; +} diff --git a/drivers/net/davinci_cpdma.h b/drivers/net/davinci_cpdma.h new file mode 100644 index 000000000000..868e50ebde45 --- /dev/null +++ b/drivers/net/davinci_cpdma.h @@ -0,0 +1,108 @@ +/* + * Texas Instruments CPDMA Driver + * + * Copyright (C) 2010 Texas Instruments + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License as + * published by the Free Software Foundation version 2. + * + * This program is distributed "as is" WITHOUT ANY WARRANTY of any + * kind, whether express or implied; without even the implied warranty + * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + */ +#ifndef __DAVINCI_CPDMA_H__ +#define __DAVINCI_CPDMA_H__ + +#define CPDMA_MAX_CHANNELS BITS_PER_LONG + +#define tx_chan_num(chan) (chan) +#define rx_chan_num(chan) ((chan) + CPDMA_MAX_CHANNELS) +#define is_rx_chan(chan) ((chan)->chan_num >= CPDMA_MAX_CHANNELS) +#define is_tx_chan(chan) (!is_rx_chan(chan)) +#define __chan_linear(chan_num) ((chan_num) & (CPDMA_MAX_CHANNELS - 1)) +#define chan_linear(chan) __chan_linear((chan)->chan_num) + +struct cpdma_params { + struct device *dev; + void __iomem *dmaregs; + void __iomem *txhdp, *rxhdp, *txcp, *rxcp; + void __iomem *rxthresh, *rxfree; + int num_chan; + bool has_soft_reset; + int min_packet_size; + u32 desc_mem_phys; + int desc_mem_size; + int desc_align; + + /* + * Some instances of embedded cpdma controllers have extra control and + * status registers. The following flag enables access to these + * "extended" registers. + */ + bool has_ext_regs; +}; + +struct cpdma_chan_stats { + u32 head_enqueue; + u32 tail_enqueue; + u32 pad_enqueue; + u32 misqueued; + u32 desc_alloc_fail; + u32 pad_alloc_fail; + u32 runt_receive_buff; + u32 runt_transmit_buff; + u32 empty_dequeue; + u32 busy_dequeue; + u32 good_dequeue; + u32 requeue; + u32 teardown_dequeue; +}; + +struct cpdma_ctlr; +struct cpdma_chan; + +typedef void (*cpdma_handler_fn)(void *token, int len, int status); + +struct cpdma_ctlr *cpdma_ctlr_create(struct cpdma_params *params); +int cpdma_ctlr_destroy(struct cpdma_ctlr *ctlr); +int cpdma_ctlr_start(struct cpdma_ctlr *ctlr); +int cpdma_ctlr_stop(struct cpdma_ctlr *ctlr); +int cpdma_ctlr_dump(struct cpdma_ctlr *ctlr); + +struct cpdma_chan *cpdma_chan_create(struct cpdma_ctlr *ctlr, int chan_num, + cpdma_handler_fn handler); +int cpdma_chan_destroy(struct cpdma_chan *chan); +int cpdma_chan_start(struct cpdma_chan *chan); +int cpdma_chan_stop(struct cpdma_chan *chan); +int cpdma_chan_dump(struct cpdma_chan *chan); + +int cpdma_chan_get_stats(struct cpdma_chan *chan, + struct cpdma_chan_stats *stats); +int cpdma_chan_submit(struct cpdma_chan *chan, void *token, void *data, + int len, gfp_t gfp_mask); +int cpdma_chan_process(struct cpdma_chan *chan, int quota); + +int cpdma_ctlr_int_ctrl(struct cpdma_ctlr *ctlr, bool enable); +void cpdma_ctlr_eoi(struct cpdma_ctlr *ctlr); +int cpdma_chan_int_ctrl(struct cpdma_chan *chan, bool enable); + +enum cpdma_control { + CPDMA_CMD_IDLE, /* write-only */ + CPDMA_COPY_ERROR_FRAMES, /* read-write */ + CPDMA_RX_OFF_LEN_UPDATE, /* read-write */ + CPDMA_RX_OWNERSHIP_FLIP, /* read-write */ + CPDMA_TX_PRIO_FIXED, /* read-write */ + CPDMA_STAT_IDLE, /* read-only */ + CPDMA_STAT_TX_ERR_CHAN, /* read-only */ + CPDMA_STAT_TX_ERR_CODE, /* read-only */ + CPDMA_STAT_RX_ERR_CHAN, /* read-only */ + CPDMA_STAT_RX_ERR_CODE, /* read-only */ + CPDMA_RX_BUFFER_OFFSET, /* read-write */ +}; + +int cpdma_control_get(struct cpdma_ctlr *ctlr, int control); +int cpdma_control_set(struct cpdma_ctlr *ctlr, int control, int value); + +#endif -- cgit v1.2.3-58-ga151