[natsemi] Replace driver for National Semicondutor NICs

Signed-off-by: Michael Brown <mcb30@ipxe.org>

1 files changed, 291 insertions, 194 deletions

diff --git a/src/drivers/net/natsemi.h b/src/drivers/net/natsemi.h
index ae827ba39..e3444712b 100644
--- a/src/drivers/net/natsemi.h
+++ b/src/drivers/net/natsemi.h
@@ -1,232 +1,329 @@
-FILE_LICENCE ( GPL_ANY );
+#ifndef _NATSEMI_H
+#define _NATSEMI_H
 
-#define NATSEMI_HW_TIMEOUT 400
+/** @file
+ *
+ * National Semiconductor "MacPhyter" network card driver
+ *
+ */
+
+FILE_LICENCE ( GPL2_OR_LATER );
 
-#define TX_RING_SIZE 4
-#define NUM_RX_DESC  4
-#define RX_BUF_SIZE 1536
-#define OWN       0x80000000
-#define DSIZE     0x00000FFF
-#define CRC_SIZE  4
+#include <stdint.h>
+#include <ipxe/spi.h>
+#include <ipxe/spi_bit.h>
 
-struct natsemi_tx {
+/** BAR size */
+#define NATSEMI_BAR_SIZE 0x100
+
+/** A 32-bit packet descriptor */
+struct natsemi_descriptor_32 {
+	/** Link to next descriptor */
 	uint32_t link;
+	/** Command / status */
 	uint32_t cmdsts;
+	/** Buffer pointer */
 	uint32_t bufptr;
-};
+} __attribute__ (( packed ));
 
-struct natsemi_rx {
-	uint32_t link;
+/** A 64-bit packet descriptor */
+struct natsemi_descriptor_64 {
+	/** Link to next descriptor */
+	uint64_t link;
+	/** Buffer pointer */
+	uint64_t bufptr;
+	/** Command / status */
 	uint32_t cmdsts;
-	uint32_t bufptr;
-};
+	/** Extended status */
+	uint32_t extsts;
+} __attribute__ (( packed ));
 
-struct natsemi_private {
-	unsigned short ioaddr;
-	unsigned short tx_cur;
-	unsigned short tx_dirty;
-	unsigned short rx_cur;
-	struct natsemi_tx tx[TX_RING_SIZE];
-	struct natsemi_rx rx[NUM_RX_DESC];
-
-	/* need to add iobuf as we cannot free iobuf->data in close without this 
-	 * alternatively substracting sizeof(head) and sizeof(list_head) can also 
-	 * give the same.
-	 */
-	struct io_buffer *iobuf[NUM_RX_DESC];
-
-	/* netdev_tx_complete needs pointer to the iobuf of the data so as to free 
-	 * it from the memory.
-	 */
-	struct io_buffer *tx_iobuf[TX_RING_SIZE];
-	struct spi_bit_basher spibit;
-	struct spi_device eeprom;
-	struct nvo_block nvo;
+/** A packet descriptor
+ *
+ * The 32-bit and 64-bit variants are overlaid such that "cmdsts" can
+ * be accessed as a common field, and the overall size is a power of
+ * two (to allow the descriptor ring length to be used as an
+ * alignment).
+ */
+union natsemi_descriptor {
+	/** Common fields */
+	struct {
+		/** Reserved */
+		uint8_t reserved_a[16];
+		/** Command / status */
+		uint32_t cmdsts;
+		/** Reserved */
+		uint8_t reserved_b[12];
+	} __attribute__ (( packed )) common;
+	/** 64-bit descriptor */
+	struct natsemi_descriptor_64 d64;
+	/** 32-bit descriptor */
+	struct {
+		/** Reserved */
+		uint8_t reserved[12];
+		/** Descriptor */
+		struct natsemi_descriptor_32 d32;
+	} __attribute__ (( packed )) d32pad;
 };
 
-/*
- * Support for fibre connections on Am79C874:
- * This phy needs a special setup when connected to a fibre cable.
- * http://www.amd.com/files/connectivitysolutions/networking/archivednetworking/22235.pdf
- */
-#define PHYID_AM79C874	0x0022561b
+/** Descriptor buffer size mask */
+#define NATSEMI_DESC_SIZE_MASK 0xfff
 
-enum {
-	MII_MCTRL	= 0x15,		/* mode control register */
-	MII_FX_SEL	= 0x0001,	/* 100BASE-FX (fiber) */
-	MII_EN_SCRM	= 0x0004,	/* enable scrambler (tp) */
+/** Packet descriptor flags */
+enum natsemi_descriptor_flags {
+	/** Descriptor is owned by NIC */
+	NATSEMI_DESC_OWN = 0x80000000UL,
+	/** Request descriptor interrupt */
+	NATSEMI_DESC_INTR = 0x20000000UL,
+	/** Packet OK */
+	NATSEMI_DESC_OK = 0x08000000UL,
 };
 
+/** Command Register */
+#define NATSEMI_CR 0x0000
+#define NATSEMI_CR_RST		0x00000100UL	/**< Reset */
+#define NATSEMI_CR_RXR		0x00000020UL	/**< Receiver reset */
+#define NATSEMI_CR_TXR		0x00000010UL	/**< Transmit reset */
+#define NATSEMI_CR_RXE		0x00000004UL	/**< Receiver enable */
+#define NATSEMI_CR_TXE		0x00000001UL	/**< Transmit enable */
+
+/** Maximum time to wait for a reset, in milliseconds */
+#define NATSEMI_RESET_MAX_WAIT_MS 100
+
+/** Configuration and Media Status Register */
+#define NATSEMI_CFG 0x0004
+#define NATSEMI_CFG_LNKSTS	0x80000000UL	/**< Link status */
+#define NATSEMI_CFG_SPDSTS1	0x40000000UL	/**< Speed status bit 1 */
+#define NATSEMI_CFG_MODE_1000	0x00400000UL	/**< 1000 Mb/s mode control */
+#define NATSEMI_CFG_PCI64_DET	0x00002000UL	/**< PCI 64-bit bus detected */
+#define NATSEMI_CFG_DATA64_EN	0x00001000UL	/**< 64-bit data enable */
+#define NATSEMI_CFG_M64ADDR	0x00000800UL	/**< 64-bit address enable */
+#define NATSEMI_CFG_EXTSTS_EN	0x00000100UL	/**< Extended status enable */
+
+/** EEPROM Access Register */
+#define NATSEMI_MEAR 0x0008
+#define NATSEMI_MEAR_EESEL	0x00000008UL	/**< EEPROM chip select */
+#define NATSEMI_MEAR_EECLK	0x00000004UL	/**< EEPROM serial clock */
+#define NATSEMI_MEAR_EEDO	0x00000002UL	/**< EEPROM data out */
+#define NATSEMI_MEAR_EEDI	0x00000001UL	/**< EEPROM data in */
+
+/** Size of EEPROM (in bytes) */
+#define NATSEMI_EEPROM_SIZE 32
+
+/** Word offset of MAC address within sane EEPROM layout */
+#define NATSEMI_EEPROM_MAC_SANE 0x0a
+
+/** Word offset of MAC address within insane EEPROM layout */
+#define NATSEMI_EEPROM_MAC_INSANE 0x06
+
+/** PCI Test Control Register */
+#define NATSEMI_PTSCR 0x000c
+#define NATSEMI_PTSCR_EELOAD_EN	0x00000004UL	/**< Enable EEPROM load */
+
+/** Maximum time to wait for a configuration reload, in milliseconds */
+#define NATSEMI_EELOAD_MAX_WAIT_MS 100
+
+/** Interrupt Status Register */
+#define NATSEMI_ISR 0x0010
+#define NATSEMI_IRQ_TXDESC	0x00000080UL	/**< TX descriptor */
+#define NATSEMI_IRQ_RXDESC	0x00000002UL	/**< RX descriptor */
+
+/** Interrupt Mask Register */
+#define NATSEMI_IMR 0x0014
+
+/** Interrupt Enable Register */
+#define NATSEMI_IER 0x0018
+#define NATSEMI_IER_IE		0x00000001UL	/**< Interrupt enable */
+
+/** Transmit Descriptor Pointer */
+#define NATSEMI_TXDP 0x0020
+
+/** Transmit Descriptor Pointer High Dword (64-bit) */
+#define NATSEMI_TXDP_HI_64 0x0024
+
+/** Number of transmit descriptors */
+#define NATSEMI_NUM_TX_DESC 4
 
+/** Transmit configuration register (32-bit) */
+#define NATSEMI_TXCFG_32 0x24
 
-/* values we might find in the silicon revision register */
-#define SRR_DP83815_C	0x0302
-#define SRR_DP83815_D	0x0403
-#define SRR_DP83816_A4	0x0504
-#define SRR_DP83816_A5	0x0505
+/** Transmit configuration register (64-bit) */
+#define NATSEMI_TXCFG_64 0x28
+#define NATSEMI_TXCFG_CSI	0x80000000UL	/**< Carrier sense ignore */
+#define NATSEMI_TXCFG_HBI	0x40000000UL	/**< Heartbeat ignore */
+#define NATSEMI_TXCFG_ATP	0x10000000UL	/**< Automatic padding */
+#define NATSEMI_TXCFG_ECRETRY	0x00800000UL	/**< Excess collision retry */
+#define NATSEMI_TXCFG_MXDMA(x)	( (x) << 20 )	/**< Max DMA burst size */
+#define NATSEMI_TXCFG_FLTH(x)	( (x) << 8 )	/**< Fill threshold */
+#define NATSEMI_TXCFG_DRTH(x)	( (x) << 0 )	/**< Drain threshold */
 
-/* NATSEMI: Offsets to the device registers.
- * Unlike software-only systems, device drivers interact with complex hardware.
- * It's not useful to define symbolic names for every register bit in the
- * device.
+/** Max DMA burst size (encoded value)
+ *
+ * This represents 256-byte bursts on 83815 controllers and 512-byte
+ * bursts on 83820 controllers.
  */
-enum register_offsets {
-    ChipCmd      = 0x00, 
-    ChipConfig   = 0x04, 
-    EECtrl       = 0x08, 
-    PCIBusCfg    = 0x0C,
-    IntrStatus   = 0x10, 
-    IntrMask     = 0x14, 
-    IntrEnable   = 0x18,
-    TxRingPtr    = 0x20, 
-    TxConfig     = 0x24,
-    RxRingPtr    = 0x30,
-    RxConfig     = 0x34, 
-    ClkRun       = 0x3C,
-    WOLCmd       = 0x40, 
-    PauseCmd     = 0x44,
-    RxFilterAddr = 0x48, 
-    RxFilterData = 0x4C,
-    BootRomAddr  = 0x50, 
-    BootRomData  = 0x54, 
-    SiliconRev   = 0x58, 
-    StatsCtrl    = 0x5C,
-    StatsData    = 0x60, 
-    RxPktErrs    = 0x60, 
-    RxMissed     = 0x68, 
-    RxCRCErrs    = 0x64,
-    PCIPM        = 0x44,
-    PhyStatus    = 0xC0, 
-    MIntrCtrl    = 0xC4, 
-    MIntrStatus  = 0xC8,
-
-    /* These are from the spec, around page 78... on a separate table. 
-     */
-    PGSEL        = 0xCC, 
-    PMDCSR       = 0xE4, 
-    TSTDAT       = 0xFC, 
-    DSPCFG       = 0xF4, 
-    SDCFG        = 0x8C,
-    BasicControl = 0x80,	
-    BasicStatus  = 0x84
-	    
-};
+#define NATSEMI_TXCFG_MXDMA_DEFAULT NATSEMI_TXCFG_MXDMA ( 0x7 )
 
-/* the values for the 'magic' registers above (PGSEL=1) */
-#define PMDCSR_VAL	0x189c	/* enable preferred adaptation circuitry */
-#define TSTDAT_VAL	0x0
-#define DSPCFG_VAL	0x5040
-#define SDCFG_VAL	0x008c	/* set voltage thresholds for Signal Detect */
-#define DSPCFG_LOCK	0x20	/* coefficient lock bit in DSPCFG */
-#define DSPCFG_COEF	0x1000	/* see coefficient (in TSTDAT) bit in DSPCFG */
-#define TSTDAT_FIXED	0xe8	/* magic number for bad coefficients */
+/** Fill threshold (in units of 32 bytes)
+ *
+ * Must be at least as large as the max DMA burst size, so use a value
+ * of 512 bytes.
+ */
+#define NATSEMI_TXCFG_FLTH_DEFAULT NATSEMI_TXCFG_FLTH ( 512 / 32 )
 
-/* Bit in ChipCmd.
+/** Drain threshold (in units of 32 bytes)
+ *
+ * Start transmission once we receive a conservative 1024 bytes, to
+ * avoid FIFO underrun errors.  (83815 does not allow us to specify a
+ * value of 0 for "wait until whole packet is present".)
+ *
+ * Fill threshold plus drain threshold must be less than the transmit
+ * FIFO size, which is 2kB on 83815 and 8kB on 83820.
  */
-enum ChipCmdBits {
-    ChipReset = 0x100, 
-    RxReset   = 0x20, 
-    TxReset   = 0x10, 
-    RxOff     = 0x08, 
-    RxOn      = 0x04,
-    TxOff     = 0x02, 
-    TxOn      = 0x01
-};
+#define NATSEMI_TXCFG_DRTH_DEFAULT NATSEMI_TXCFG_DRTH ( 1024 / 32 )
 
-enum ChipConfig_bits {
-	CfgPhyDis		= 0x200,
-	CfgPhyRst		= 0x400,
-	CfgExtPhy		= 0x1000,
-	CfgAnegEnable		= 0x2000,
-	CfgAneg100		= 0x4000,
-	CfgAnegFull		= 0x8000,
-	CfgAnegDone		= 0x8000000,
-	CfgFullDuplex		= 0x20000000,
-	CfgSpeed100		= 0x40000000,
-	CfgLink			= 0x80000000,
-};
+/** Receive Descriptor Pointer */
+#define NATSEMI_RXDP 0x0030
 
+/** Receive Descriptor Pointer High Dword (64-bit) */
+#define NATSEMI_RXDP_HI_64 0x0034
 
-/* Bits in the RxMode register.
- */
-enum rx_mode_bits {
-    AcceptErr          = 0x20,
-    AcceptRunt         = 0x10,
-    AcceptBroadcast    = 0xC0000000,
-    AcceptMulticast    = 0x00200000, 
-    AcceptAllMulticast = 0x20000000,
-    AcceptAllPhys      = 0x10000000, 
-    AcceptMyPhys       = 0x08000000,
-    RxFilterEnable     = 0x80000000
-};
+/** Number of receive descriptors */
+#define NATSEMI_NUM_RX_DESC 4
+
+/** Receive buffer length */
+#define NATSEMI_RX_MAX_LEN ( ETH_FRAME_LEN + 4 /* VLAN */ + 4 /* CRC */ )
 
-/* Bits in network_desc.status
+/** Receive configuration register (32-bit) */
+#define NATSEMI_RXCFG_32 0x34
+
+/** Receive configuration register (64-bit) */
+#define NATSEMI_RXCFG_64 0x38
+#define NATSEMI_RXCFG_ARP	0x40000000UL	/**< Accept runt packets */
+#define NATSEMI_RXCFG_ATX	0x10000000UL	/**< Accept transmit packets */
+#define NATSEMI_RXCFG_ALP	0x08000000UL	/**< Accept long packets */
+#define NATSEMI_RXCFG_MXDMA(x)	( (x) << 20 )	/**< Max DMA burst size */
+#define NATSEMI_RXCFG_DRTH(x)	( (x) << 1 )	/**< Drain threshold */
+
+/** Max DMA burst size (encoded value)
+ *
+ * This represents 256-byte bursts on 83815 controllers and 512-byte
+ * bursts on 83820 controllers.
  */
-enum desc_status_bits {
-    DescOwn   = 0x80000000, 
-    DescMore  = 0x40000000, 
-    DescIntr  = 0x20000000,
-    DescNoCRC = 0x10000000,
-    DescPktOK = 0x08000000, 
-    RxTooLong = 0x00400000
-};
+#define NATSEMI_RXCFG_MXDMA_DEFAULT NATSEMI_RXCFG_MXDMA ( 0x7 )
 
-/*Bits in Interrupt Mask register
+/** Drain threshold (in units of 8 bytes)
+ *
+ * Start draining after 64 bytes.
+ *
+ * Must be large enough to allow packet's accept/reject status to be
+ * determined before draining begins.
  */
-enum Intr_mask_register_bits {
-    RxOk       = 0x001,
-    RxErr      = 0x004,
-    TxOk       = 0x040,
-    TxErr      = 0x100 
-};	
-
-enum MIntrCtrl_bits {
-  MICRIntEn               = 0x2,
-};
+#define NATSEMI_RXCFG_DRTH_DEFAULT NATSEMI_RXCFG_DRTH ( 64 / 8 )
+
+/** Receive Filter/Match Control Register */
+#define NATSEMI_RFCR 0x0048
+#define NATSEMI_RFCR_RFEN	0x80000000UL	/**< RX filter enable */
+#define NATSEMI_RFCR_AAB	0x40000000UL	/**< Accept all broadcast */
+#define NATSEMI_RFCR_AAM	0x20000000UL	/**< Accept all multicast */
+#define NATSEMI_RFCR_AAU	0x10000000UL	/**< Accept all unicast */
+#define NATSEMI_RFCR_RFADDR( addr ) ( (addr) << 0 ) /**< Extended address */
+#define NATSEMI_RFCR_RFADDR_MASK NATSEMI_RFCR_RFADDR ( 0x3ff )
+
+/** Perfect match filter address base */
+#define NATSEMI_RFADDR_PMATCH_BASE 0x000
 
-/* CFG bits [13:16] [18:23] */
-#define CFG_RESET_SAVE 0xfde000
-/* WCSR bits [0:4] [9:10] */
-#define WCSR_RESET_SAVE 0x61f
-/* RFCR bits [20] [22] [27:31] */
-#define RFCR_RESET_SAVE 0xf8500000;
-
-/* Delay between EEPROM clock transitions.
-   No extra delay is needed with 33Mhz PCI, but future 66Mhz access may need
-   a delay. */
-#define eeprom_delay(ee_addr)   inl(ee_addr)
-
-enum EEPROM_Ctrl_Bits {
-	EE_ShiftClk   = 0x04,
-	EE_DataIn     = 0x01,
-	EE_ChipSelect = 0x08,
-	EE_DataOut    = 0x02
+/** Receive Filter/Match Data Register */
+#define NATSEMI_RFDR 0x004c
+#define NATSEMI_RFDR_BMASK	0x00030000UL	/**< Byte mask */
+#define NATSEMI_RFDR_DATA( value ) ( (value) & 0xffff ) /**< Filter data */
+
+/** National Semiconductor network card flags */
+enum natsemi_nic_flags {
+	/** EEPROM is little-endian */
+	NATSEMI_EEPROM_LITTLE_ENDIAN = 0x0001,
+	/** EEPROM layout is insane */
+	NATSEMI_EEPROM_INSANE = 0x0002,
+	/** Card supports 64-bit operation */
+	NATSEMI_64BIT = 0x0004,
+	/** Card supports 1000Mbps link */
+	NATSEMI_1000 = 0x0008,
 };
 
-#define EE_Write0 (EE_ChipSelect)
-#define EE_Write1 (EE_ChipSelect | EE_DataIn)
+/** A National Semiconductor descriptor ring */
+struct natsemi_ring {
+	/** Descriptors */
+	union natsemi_descriptor *desc;
+	/** Producer index */
+	unsigned int prod;
+	/** Consumer index */
+	unsigned int cons;
 
-/* The EEPROM commands include the alway-set leading bit. */
-enum EEPROM_Cmds {
-  EE_WriteCmd=(5 << 6), EE_ReadCmd=(6 << 6), EE_EraseCmd=(7 << 6),
+	/** Number of descriptors */
+	unsigned int count;
+	/** Descriptor start address register */
+	unsigned int reg;
 };
 
-/*  EEPROM access , values are devices specific
+/**
+ * Initialise descriptor ring
+ *
+ * @v ring		Descriptor ring
+ * @v count		Number of descriptors
+ * @v reg		Descriptor start address register
  */
-#define EE_CS		0x08	/* EEPROM chip select */
-#define EE_SK		0x04	/* EEPROM shift clock */
-#define EE_DI		0x01	/* Data in */
-#define EE_DO		0x02	/* Data out */
+static inline __attribute__ (( always_inline)) void
+natsemi_init_ring ( struct natsemi_ring *ring, unsigned int count,
+		    unsigned int reg ) {
+	ring->count = count;
+	ring->reg = reg;
+}
 
-/* Offsets within EEPROM (these are word offsets)
- */
-#define EE_MAC 7
-#define EE_REG  EECtrl
-
-static const uint8_t natsemi_ee_bits[] = {
-	[SPI_BIT_SCLK]	= EE_SK,
-	[SPI_BIT_MOSI]	= EE_DI,
-	[SPI_BIT_MISO]	= EE_DO,
-	[SPI_BIT_SS(0)]	= EE_CS,
+/** A National Semiconductor network card */
+struct natsemi_nic {
+	/** Flags */
+	unsigned int flags;
+	/** Registers */
+	void *regs;
+	/** SPI bit-bashing interface */
+	struct spi_bit_basher spibit;
+	/** EEPROM */
+	struct spi_device eeprom;
+
+	/** Transmit descriptor ring */
+	struct natsemi_ring tx;
+	/** Receive descriptor ring */
+	struct natsemi_ring rx;
+	/** Receive I/O buffers */
+	struct io_buffer *rx_iobuf[NATSEMI_NUM_RX_DESC];
+
+	/** Link status (cache) */
+	uint32_t cfg;
 };
 
+/**
+ * Check if card can access physical address
+ *
+ * @v natsemi		National Semiconductor device
+ * @v address		Physical address
+ * @v address_ok	Card can access physical address
+ */
+static inline __attribute__ (( always_inline )) int
+natsemi_address_ok ( struct natsemi_nic *natsemi, physaddr_t address ) {
+
+	/* In a 32-bit build, all addresses can be accessed */
+	if ( sizeof ( physaddr_t ) <= sizeof ( uint32_t ) )
+		return 1;
+
+	/* A 64-bit card can access all addresses */
+	if ( natsemi->flags & NATSEMI_64BIT )
+		return 1;
+
+	/* A 32-bit card can access all address below 4GB */
+	if ( ( address & 0xffffffffUL ) == 0 )
+		return 1;
+
+	return 0;
+}
+
+#endif /* _NATSEMI_H */