/* * Hitachi SCA HD64570 driver for Linux * * Copyright (C) 1998-2003 Krzysztof Halasa <khc@pm.waw.pl> * * This program is free software; you can redistribute it and/or modify it * under the terms of version 2 of the GNU General Public License * as published by the Free Software Foundation. * * Source of information: Hitachi HD64570 SCA User's Manual * * We use the following SCA memory map: * * Packet buffer descriptor rings - starting from winbase or win0base: * rx_ring_buffers * sizeof(pkt_desc) = logical channel #0 RX ring * tx_ring_buffers * sizeof(pkt_desc) = logical channel #0 TX ring * rx_ring_buffers * sizeof(pkt_desc) = logical channel #1 RX ring (if used) * tx_ring_buffers * sizeof(pkt_desc) = logical channel #1 TX ring (if used) * * Packet data buffers - starting from winbase + buff_offset: * rx_ring_buffers * HDLC_MAX_MRU = logical channel #0 RX buffers * tx_ring_buffers * HDLC_MAX_MRU = logical channel #0 TX buffers * rx_ring_buffers * HDLC_MAX_MRU = logical channel #0 RX buffers (if used) * tx_ring_buffers * HDLC_MAX_MRU = logical channel #0 TX buffers (if used) */ #include <linux/bitops.h> #include <linux/errno.h> #include <linux/fcntl.h> #include <linux/hdlc.h> #include <linux/in.h> #include <linux/interrupt.h> #include <linux/ioport.h> #include <linux/jiffies.h> #include <linux/kernel.h> #include <linux/module.h> #include <linux/netdevice.h> #include <linux/skbuff.h> #include <linux/string.h> #include <linux/types.h> #include <asm/io.h> #include <linux/uaccess.h> #include "hd64570.h" #define get_msci(port) (phy_node(port) ? MSCI1_OFFSET : MSCI0_OFFSET) #define get_dmac_rx(port) (phy_node(port) ? DMAC1RX_OFFSET : DMAC0RX_OFFSET) #define get_dmac_tx(port) (phy_node(port) ? DMAC1TX_OFFSET : DMAC0TX_OFFSET) #define SCA_INTR_MSCI(node) (node ? 0x10 : 0x01) #define SCA_INTR_DMAC_RX(node) (node ? 0x20 : 0x02) #define SCA_INTR_DMAC_TX(node) (node ? 0x40 : 0x04) static inline struct net_device *port_to_dev(port_t *port) { return port->dev; } static inline int sca_intr_status(card_t *card) { u8 result = 0; u8 isr0 = sca_in(ISR0, card); u8 isr1 = sca_in(ISR1, card); if (isr1 & 0x03) result |= SCA_INTR_DMAC_RX(0); if (isr1 & 0x0C) result |= SCA_INTR_DMAC_TX(0); if (isr1 & 0x30) result |= SCA_INTR_DMAC_RX(1); if (isr1 & 0xC0) result |= SCA_INTR_DMAC_TX(1); if (isr0 & 0x0F) result |= SCA_INTR_MSCI(0); if (isr0 & 0xF0) result |= SCA_INTR_MSCI(1); if (!(result & SCA_INTR_DMAC_TX(0))) if (sca_in(DSR_TX(0), card) & DSR_EOM) result |= SCA_INTR_DMAC_TX(0); if (!(result & SCA_INTR_DMAC_TX(1))) if (sca_in(DSR_TX(1), card) & DSR_EOM) result |= SCA_INTR_DMAC_TX(1); return result; } static inline port_t* dev_to_port(struct net_device *dev) { return dev_to_hdlc(dev)->priv; } static inline u16 next_desc(port_t *port, u16 desc, int transmit) { return (desc + 1) % (transmit ? port_to_card(port)->tx_ring_buffers : port_to_card(port)->rx_ring_buffers); } static inline u16 desc_abs_number(port_t *port, u16 desc, int transmit) { u16 rx_buffs = port_to_card(port)->rx_ring_buffers; u16 tx_buffs = port_to_card(port)->tx_ring_buffers; desc %= (transmit ? tx_buffs : rx_buffs); // called with "X + 1" etc. return log_node(port) * (rx_buffs + tx_buffs) + transmit * rx_buffs + desc; } static inline u16 desc_offset(port_t *port, u16 desc, int transmit) { /* Descriptor offset always fits in 16 bits */ return desc_abs_number(port, desc, transmit) * sizeof(pkt_desc); } static inline pkt_desc __iomem *desc_address(port_t *port, u16 desc, int transmit) { #ifdef PAGE0_ALWAYS_MAPPED return (pkt_desc __iomem *)(win0base(port_to_card(port)) + desc_offset(port, desc, transmit)); #else return (pkt_desc __iomem *)(winbase(port_to_card(port)) + desc_offset(port, desc, transmit)); #endif } static inline u32 buffer_offset(port_t *port, u16 desc, int transmit) { return port_to_card(port)->buff_offset + desc_abs_number(port, desc, transmit) * (u32)HDLC_MAX_MRU; } static inline void sca_set_carrier(port_t *port) { if (!(sca_in(get_msci(port) + ST3, port_to_card(port)) & ST3_DCD)) { #ifdef DEBUG_LINK printk(KERN_DEBUG "%s: sca_set_carrier on\n", port_to_dev(port)->name); #endif netif_carrier_on(port_to_dev(port)); } else { #ifdef DEBUG_LINK printk(KERN_DEBUG "%s: sca_set_carrier off\n", port_to_dev(port)->name); #endif netif_carrier_off(port_to_dev(port)); } } static void sca_init_port(port_t *port) { card_t *card = port_to_card(port); int transmit, i; port->rxin = 0; port->txin = 0; port->txlast = 0; #ifndef PAGE0_ALWAYS_MAPPED openwin(card, 0); #endif for (transmit = 0; transmit < 2; transmit++) { u16 dmac = transmit ? get_dmac_tx(port) : get_dmac_rx(port); u16 buffs = transmit ? card->tx_ring_buffers : card->rx_ring_buffers; for (i = 0; i < buffs; i++) { pkt_desc __iomem *desc = desc_address(port, i, transmit); u16 chain_off = desc_offset(port, i + 1, transmit); u32 buff_off = buffer_offset(port, i, transmit); writew(chain_off, &desc->cp); writel(buff_off, &desc->bp); writew(0, &desc->len); writeb(0, &desc->stat); } /* DMA disable - to halt state */ sca_out(0, transmit ? DSR_TX(phy_node(port)) : DSR_RX(phy_node(port)), card); /* software ABORT - to initial state */ sca_out(DCR_ABORT, transmit ? DCR_TX(phy_node(port)) : DCR_RX(phy_node(port)), card); /* current desc addr */ sca_out(0, dmac + CPB, card); /* pointer base */ sca_outw(desc_offset(port, 0, transmit), dmac + CDAL, card); if (!transmit) sca_outw(desc_offset(port, buffs - 1, transmit), dmac + EDAL, card); else sca_outw(desc_offset(port, 0, transmit), dmac + EDAL, card); /* clear frame end interrupt counter */ sca_out(DCR_CLEAR_EOF, transmit ? DCR_TX(phy_node(port)) : DCR_RX(phy_node(port)), card); if (!transmit) { /* Receive */ /* set buffer length */ sca_outw(HDLC_MAX_MRU, dmac + BFLL, card); /* Chain mode, Multi-frame */ sca_out(0x14, DMR_RX(phy_node(port)), card); sca_out(DIR_EOME | DIR_BOFE, DIR_RX(phy_node(port)), card); /* DMA enable */ sca_out(DSR_DE, DSR_RX(phy_node(port)), card); } else { /* Transmit */ /* Chain mode, Multi-frame */ sca_out(0x14, DMR_TX(phy_node(port)), card); /* enable underflow interrupts */ sca_out(DIR_BOFE, DIR_TX(phy_node(port)), card); } } sca_set_carrier(port); } #ifdef NEED_SCA_MSCI_INTR /* MSCI interrupt service */ static inline void sca_msci_intr(port_t *port) { u16 msci = get_msci(port); card_t* card = port_to_card(port); u8 stat = sca_in(msci + ST1, card); /* read MSCI ST1 status */ /* Reset MSCI TX underrun and CDCD status bit */ sca_out(stat & (ST1_UDRN | ST1_CDCD), msci + ST1, card); if (stat & ST1_UDRN) { /* TX Underrun error detected */ port_to_dev(port)->stats.tx_errors++; port_to_dev(port)->stats.tx_fifo_errors++; } if (stat & ST1_CDCD) sca_set_carrier(port); } #endif static inline void sca_rx(card_t *card, port_t *port, pkt_desc __iomem *desc, u16 rxin) { struct net_device *dev = port_to_dev(port); struct sk_buff *skb; u16 len; u32 buff; u32 maxlen; u8 page; len = readw(&desc->len); skb = dev_alloc_skb(len); if (!skb) { dev->stats.rx_dropped++; return; } buff = buffer_offset(port, rxin, 0); page = buff / winsize(card); buff = buff % winsize(card); maxlen = winsize(card) - buff; openwin(card, page); if (len > maxlen) { memcpy_fromio(skb->data, winbase(card) + buff, maxlen); openwin(card, page + 1); memcpy_fromio(skb->data + maxlen, winbase(card), len - maxlen); } else memcpy_fromio(skb->data, winbase(card) + buff, len); #ifndef PAGE0_ALWAYS_MAPPED openwin(card, 0); /* select pkt_desc table page back */ #endif skb_put(skb, len); #ifdef DEBUG_PKT printk(KERN_DEBUG "%s RX(%i):", dev->name, skb->len); debug_frame(skb); #endif dev->stats.rx_packets++; dev->stats.rx_bytes += skb->len; skb->protocol = hdlc_type_trans(skb, dev); netif_rx(skb); } /* Receive DMA interrupt service */ static inline void sca_rx_intr(port_t *port) { struct net_device *dev = port_to_dev(port); u16 dmac = get_dmac_rx(port); card_t *card = port_to_card(port); u8 stat = sca_in(DSR_RX(phy_node(port)), card); /* read DMA Status */ /* Reset DSR status bits */ sca_out((stat & (DSR_EOT | DSR_EOM | DSR_BOF | DSR_COF)) | DSR_DWE, DSR_RX(phy_node(port)), card); if (stat & DSR_BOF) /* Dropped one or more frames */ dev->stats.rx_over_errors++; while (1) { u32 desc_off = desc_offset(port, port->rxin, 0); pkt_desc __iomem *desc; u32 cda = sca_inw(dmac + CDAL, card); if ((cda >= desc_off) && (cda < desc_off + sizeof(pkt_desc))) break; /* No frame received */ desc = desc_address(port, port->rxin, 0); stat = readb(&desc->stat); if (!(stat & ST_RX_EOM)) port->rxpart = 1; /* partial frame received */ else if ((stat & ST_ERROR_MASK) || port->rxpart) { dev->stats.rx_errors++; if (stat & ST_RX_OVERRUN) dev->stats.rx_fifo_errors++; else if ((stat & (ST_RX_SHORT | ST_RX_ABORT | ST_RX_RESBIT)) || port->rxpart) dev->stats.rx_frame_errors++; else if (stat & ST_RX_CRC) dev->stats.rx_crc_errors++; if (stat & ST_RX_EOM) port->rxpart = 0; /* received last fragment */ } else sca_rx(card, port, desc, port->rxin); /* Set new error descriptor address */ sca_outw(desc_off, dmac + EDAL, card); port->rxin = next_desc(port, port->rxin, 0); } /* make sure RX DMA is enabled */ sca_out(DSR_DE, DSR_RX(phy_node(port)), card); } /* Transmit DMA interrupt service */ static inline void sca_tx_intr(port_t *port) { struct net_device *dev = port_to_dev(port); u16 dmac = get_dmac_tx(port); card_t* card = port_to_card(port); u8 stat; spin_lock(&port->lock); stat = sca_in(DSR_TX(phy_node(port)), card); /* read DMA Status */ /* Reset DSR status bits */ sca_out((stat & (DSR_EOT | DSR_EOM | DSR_BOF | DSR_COF)) | DSR_DWE, DSR_TX(phy_node(port)), card); while (1) { pkt_desc __iomem *desc; u32 desc_off = desc_offset(port, port->txlast, 1); u32 cda = sca_inw(dmac + CDAL, card); if ((cda >= desc_off) && (cda < desc_off + sizeof(pkt_desc))) break; /* Transmitter is/will_be sending this frame */ desc = desc_address(port, port->txlast, 1); dev->stats.tx_packets++; dev->stats.tx_bytes += readw(&desc->len); writeb(0, &desc->stat); /* Free descriptor */ port->txlast = next_desc(port, port->txlast, 1); } netif_wake_queue(dev); spin_unlock(&port->lock); } static irqreturn_t sca_intr(int irq, void* dev_id) { card_t *card = dev_id; int i; u8 stat; int handled = 0; u8 page = sca_get_page(card); while((stat = sca_intr_status(card)) != 0) { handled = 1; for (i = 0; i < 2; i++) { port_t *port = get_port(card, i); if (port) { if (stat & SCA_INTR_MSCI(i)) sca_msci_intr(port); if (stat & SCA_INTR_DMAC_RX(i)) sca_rx_intr(port); if (stat & SCA_INTR_DMAC_TX(i)) sca_tx_intr(port); } } } openwin(card, page); /* Restore original page */ return IRQ_RETVAL(handled); } static void sca_set_port(port_t *port) { card_t* card = port_to_card(port); u16 msci = get_msci(port); u8 md2 = sca_in(msci + MD2, card); unsigned int tmc, br = 10, brv = 1024; if (port->settings.clock_rate > 0) { /* Try lower br for better accuracy*/ do { br--; brv >>= 1; /* brv = 2^9 = 512 max in specs */ /* Baud Rate = CLOCK_BASE / TMC / 2^BR */ tmc = CLOCK_BASE / brv / port->settings.clock_rate; }while (br > 1 && tmc <= 128); if (tmc < 1) { tmc = 1; br = 0; /* For baud=CLOCK_BASE we use tmc=1 br=0 */ brv = 1; } else if (tmc > 255) tmc = 256; /* tmc=0 means 256 - low baud rates */ port->settings.clock_rate = CLOCK_BASE / brv / tmc; } else { br = 9; /* Minimum clock rate */ tmc = 256; /* 8bit = 0 */ port->settings.clock_rate = CLOCK_BASE / (256 * 512); } port->rxs = (port->rxs & ~CLK_BRG_MASK) | br; port->txs = (port->txs & ~CLK_BRG_MASK) | br; port->tmc = tmc; /* baud divisor - time constant*/ sca_out(port->tmc, msci + TMC, card); /* Set BRG bits */ sca_out(port->rxs, msci + RXS, card); sca_out(port->txs, msci + TXS, card); if (port->settings.loopback) md2 |= MD2_LOOPBACK; else md2 &= ~MD2_LOOPBACK; sca_out(md2, msci + MD2, card); } static void sca_open(struct net_device *dev) { port_t *port = dev_to_port(dev); card_t* card = port_to_card(port); u16 msci = get_msci(port); u8 md0, md2; switch(port->encoding) { case ENCODING_NRZ: md2 = MD2_NRZ; break; case ENCODING_NRZI: md2 = MD2_NRZI; break; case ENCODING_FM_MARK: md2 = MD2_FM_MARK; break; case ENCODING_FM_SPACE: md2 = MD2_FM_SPACE; break; default: md2 = MD2_MANCHESTER; } if (port->settings.loopback) md2 |= MD2_LOOPBACK; switch(port->parity) { case PARITY_CRC16_PR0: md0 = MD0_HDLC | MD0_CRC_16_0; break; case PARITY_CRC16_PR1: md0 = MD0_HDLC | MD0_CRC_16; break; case PARITY_CRC16_PR0_CCITT: md0 = MD0_HDLC | MD0_CRC_ITU_0; break; case PARITY_CRC16_PR1_CCITT: md0 = MD0_HDLC | MD0_CRC_ITU; break; default: md0 = MD0_HDLC | MD0_CRC_NONE; } sca_out(CMD_RESET, msci + CMD, card); sca_out(md0, msci + MD0, card); sca_out(0x00, msci + MD1, card); /* no address field check */ sca_out(md2, msci + MD2, card); sca_out(0x7E, msci + IDL, card); /* flag character 0x7E */ sca_out(CTL_IDLE, msci + CTL, card); /* Allow at least 8 bytes before requesting RX DMA operation */ /* TX with higher priority and possibly with shorter transfers */ sca_out(0x07, msci + RRC, card); /* +1=RXRDY/DMA activation condition*/ sca_out(0x10, msci + TRC0, card); /* = TXRDY/DMA activation condition*/ sca_out(0x14, msci + TRC1, card); /* +1=TXRDY/DMA deactiv condition */ /* We're using the following interrupts: - TXINT (DMAC completed all transmisions, underrun or DCD change) - all DMA interrupts */ sca_set_carrier(port); /* MSCI TX INT and RX INT A IRQ enable */ sca_out(IE0_TXINT | IE0_RXINTA, msci + IE0, card); sca_out(IE1_UDRN | IE1_CDCD, msci + IE1, card); sca_out(sca_in(IER0, card) | (phy_node(port) ? 0xC0 : 0x0C), IER0, card); /* TXINT and RXINT */ /* enable DMA IRQ */ sca_out(sca_in(IER1, card) | (phy_node(port) ? 0xF0 : 0x0F), IER1, card); sca_out(port->tmc, msci + TMC, card); /* Restore registers */ sca_out(port->rxs, msci + RXS, card); sca_out(port->txs, msci + TXS, card); sca_out(CMD_TX_ENABLE, msci + CMD, card); sca_out(CMD_RX_ENABLE, msci + CMD, card); netif_start_queue(dev); } static void sca_close(struct net_device *dev) { port_t *port = dev_to_port(dev); card_t* card = port_to_card(port); /* reset channel */ sca_out(CMD_RESET, get_msci(port) + CMD, port_to_card(port)); /* disable MSCI interrupts */ sca_out(sca_in(IER0, card) & (phy_node(port) ? 0x0F : 0xF0), IER0, card); /* disable DMA interrupts */ sca_out(sca_in(IER1, card) & (phy_node(port) ? 0x0F : 0xF0), IER1, card); netif_stop_queue(dev); } static int sca_attach(struct net_device *dev, unsigned short encoding, unsigned short parity) { if (encoding != ENCODING_NRZ && encoding != ENCODING_NRZI && encoding != ENCODING_FM_MARK && encoding != ENCODING_FM_SPACE && encoding != ENCODING_MANCHESTER) return -EINVAL; if (parity != PARITY_NONE && parity != PARITY_CRC16_PR0 && parity != PARITY_CRC16_PR1 && parity != PARITY_CRC16_PR0_CCITT && parity != PARITY_CRC16_PR1_CCITT) return -EINVAL; dev_to_port(dev)->encoding = encoding; dev_to_port(dev)->parity = parity; return 0; } #ifdef DEBUG_RINGS static void sca_dump_rings(struct net_device *dev) { port_t *port = dev_to_port(dev); card_t *card = port_to_card(port); u16 cnt; #ifndef PAGE0_ALWAYS_MAPPED u8 page = sca_get_page(card); openwin(card, 0); #endif printk(KERN_DEBUG "RX ring: CDA=%u EDA=%u DSR=%02X in=%u %sactive", sca_inw(get_dmac_rx(port) + CDAL, card), sca_inw(get_dmac_rx(port) + EDAL, card), sca_in(DSR_RX(phy_node(port)), card), port->rxin, sca_in(DSR_RX(phy_node(port)), card) & DSR_DE ? "" : "in"); for (cnt = 0; cnt < port_to_card(port)->rx_ring_buffers; cnt++) pr_cont(" %02X", readb(&(desc_address(port, cnt, 0)->stat))); pr_cont("\n"); printk(KERN_DEBUG "TX ring: CDA=%u EDA=%u DSR=%02X in=%u " "last=%u %sactive", sca_inw(get_dmac_tx(port) + CDAL, card), sca_inw(get_dmac_tx(port) + EDAL, card), sca_in(DSR_TX(phy_node(port)), card), port->txin, port->txlast, sca_in(DSR_TX(phy_node(port)), card) & DSR_DE ? "" : "in"); for (cnt = 0; cnt < port_to_card(port)->tx_ring_buffers; cnt++) pr_cont(" %02X", readb(&(desc_address(port, cnt, 1)->stat))); pr_cont("\n"); printk(KERN_DEBUG "MSCI: MD: %02x %02x %02x, ST: %02x %02x %02x %02x," " FST: %02x CST: %02x %02x\n", sca_in(get_msci(port) + MD0, card), sca_in(get_msci(port) + MD1, card), sca_in(get_msci(port) + MD2, card), sca_in(get_msci(port) + ST0, card), sca_in(get_msci(port) + ST1, card), sca_in(get_msci(port) + ST2, card), sca_in(get_msci(port) + ST3, card), sca_in(get_msci(port) + FST, card), sca_in(get_msci(port) + CST0, card), sca_in(get_msci(port) + CST1, card)); printk(KERN_DEBUG "ISR: %02x %02x %02x\n", sca_in(ISR0, card), sca_in(ISR1, card), sca_in(ISR2, card)); #ifndef PAGE0_ALWAYS_MAPPED openwin(card, page); /* Restore original page */ #endif } #endif /* DEBUG_RINGS */ static netdev_tx_t sca_xmit(struct sk_buff *skb, struct net_device *dev) { port_t *port = dev_to_port(dev); card_t *card = port_to_card(port); pkt_desc __iomem *desc; u32 buff, len; u8 page; u32 maxlen; spin_lock_irq(&port->lock); desc = desc_address(port, port->txin + 1, 1); BUG_ON(readb(&desc->stat)); /* previous xmit should stop queue */ #ifdef DEBUG_PKT printk(KERN_DEBUG "%s TX(%i):", dev->name, skb->len); debug_frame(skb); #endif desc = desc_address(port, port->txin, 1); buff = buffer_offset(port, port->txin, 1); len = skb->len; page = buff / winsize(card); buff = buff % winsize(card); maxlen = winsize(card) - buff; openwin(card, page); if (len > maxlen) { memcpy_toio(winbase(card) + buff, skb->data, maxlen); openwin(card, page + 1); memcpy_toio(winbase(card), skb->data + maxlen, len - maxlen); } else memcpy_toio(winbase(card) + buff, skb->data, len); #ifndef PAGE0_ALWAYS_MAPPED openwin(card, 0); /* select pkt_desc table page back */ #endif writew(len, &desc->len); writeb(ST_TX_EOM, &desc->stat); port->txin = next_desc(port, port->txin, 1); sca_outw(desc_offset(port, port->txin, 1), get_dmac_tx(port) + EDAL, card); sca_out(DSR_DE, DSR_TX(phy_node(port)), card); /* Enable TX DMA */ desc = desc_address(port, port->txin + 1, 1); if (readb(&desc->stat)) /* allow 1 packet gap */ netif_stop_queue(dev); spin_unlock_irq(&port->lock); dev_kfree_skb(skb); return NETDEV_TX_OK; } #ifdef NEED_DETECT_RAM static u32 sca_detect_ram(card_t *card, u8 __iomem *rambase, u32 ramsize) { /* Round RAM size to 32 bits, fill from end to start */ u32 i = ramsize &= ~3; u32 size = winsize(card); openwin(card, (i - 4) / size); /* select last window */ do { i -= 4; if ((i + 4) % size == 0) openwin(card, i / size); writel(i ^ 0x12345678, rambase + i % size); } while (i > 0); for (i = 0; i < ramsize ; i += 4) { if (i % size == 0) openwin(card, i / size); if (readl(rambase + i % size) != (i ^ 0x12345678)) break; } return i; } #endif /* NEED_DETECT_RAM */ static void sca_init(card_t *card, int wait_states) { sca_out(wait_states, WCRL, card); /* Wait Control */ sca_out(wait_states, WCRM, card); sca_out(wait_states, WCRH, card); sca_out(0, DMER, card); /* DMA Master disable */ sca_out(0x03, PCR, card); /* DMA priority */ sca_out(0, DSR_RX(0), card); /* DMA disable - to halt state */ sca_out(0, DSR_TX(0), card); sca_out(0, DSR_RX(1), card); sca_out(0, DSR_TX(1), card); sca_out(DMER_DME, DMER, card); /* DMA Master enable */ }