Re: [U-Boot] [PATCH v2 1/3] net: Adds Fast Ethernet Controller driver for Armada100

----- "Marek Vasut" marek.vasut@gmail.com wrote:

On Wednesday, August 24, 2011 03:07:18 PM Ajay Bhargav wrote:

...

This patch adds support for Fast Ethernet Controller driver for Armada100 series.

Signed-off-by: Ajay Bhargav ajay.bhargav@einfochips.com

[...]

[...]

...

+static int armdfec_phy_timeout(u32 reg, u32 flag, int cond) +{

• u32 timeout = PHY_WAIT_ITERATIONS;
• while (--timeout) {

• if (cond && (readl(reg) & flag))
  

• 	break;
  

• else if (!cond && !(readl(reg) & flag))
  

You can read the register into some temporary variable so you don't need the readl() at two places.

readl will be called only once... do i really need a temp var?

...

• 	break;
  

• udelay(PHY_WAIT_MICRO_SECONDS);
  

• }
• return !timeout;

+}

+static int smi_reg_read(const char *devname, u8 phy_addr, u8

phy_reg,

...

• 	u16 *value)
  

+{

• struct eth_device *dev = eth_get_dev_by_name(devname);
• struct armdfec_device *darmdfec = to_darmdfec(dev);
• struct armdfec_reg *regs = darmdfec->regs;
• u32 val, reg_data;
• if (phy_addr == PHY_ADR_REQ && phy_reg == PHY_ADR_REQ) {

• reg_data = readl(&regs->phyadr);
  

• *value = (u16) (reg_data & 0x1f);
  

• return 0;
  

• }
• /* check parameters */
• if (phy_addr > PHY_MASK) {

• printf("Err..(%s) Invalid phy address: 0x%X\n",
  

• 		__func__, phy_addr);
  

• return -EINVAL;
  

• }
• if (phy_reg > PHY_MASK) {

• printf("Err..(%s) Invalid register offset: 0x%X\n",
  

• 		__func__, phy_reg);
  

• return -EINVAL;
  

• }
• /* wait for the SMI register to become available */
• if (armdfec_phy_timeout((u32)&regs->smi, SMI_BUSY, FALSE)) {

Adjust the function so you don't need the cast.

okay...

...

• printf("Error (%s) PHY busy timeout\n",	__func__);
  

• return -1;
  

• }
• writel(phy_addr << 16 | phy_reg << 21 | SMI_OP_R, &regs->smi);

Parentheses missing maybe ?

:) okay..

...

• /* now wait for the data to be valid */
• if (armdfec_phy_timeout((u32)&regs->smi, SMI_R_VALID, TRUE)) {

• val = readl(&regs->smi);
  

• printf("Err (%s) PHY Read timeout, val=0x%x\n", __func__, val);
  

• return -1;
  

• }
• val = readl(&regs->smi);
• *value = val & 0xffff;
• return 0;

+}

+static int smi_reg_write(const char *devname,

• u8 phy_addr, u8 phy_reg, u16 value)
  

+{

• struct eth_device *dev = eth_get_dev_by_name(devname);
• struct armdfec_device *darmdfec = to_darmdfec(dev);
• struct armdfec_reg *regs = darmdfec->regs;
• if (phy_addr == PHY_ADR_REQ && phy_reg == PHY_ADR_REQ) {

• clrsetbits_le32(&regs->phyadr, 0x1f, value & 0x1f);
  

• return 0;
  

• }
• /* check parameters */
• if (phy_addr > PHY_MASK) {

• printf("Err..(%s) Invalid phy address\n", __func__);
  

• return -EINVAL;
  

• }
• if (phy_reg > PHY_MASK) {

• printf("Err..(%s) Invalid register offset\n", __func__);
  

• return -EINVAL;
  

• }
• /* wait for the SMI register to become available */
• if (armdfec_phy_timeout((u32)&regs->smi, SMI_BUSY, FALSE)) {

• printf("Error (%s) PHY busy timeout\n",	__func__);
  

• return -1;
  

• }
• writel(phy_addr << 16 | phy_reg << 21 | SMI_OP_W | (value &

0xffff),

...

• 	&regs->smi);
  

• return 0;

+}

+/*

• • Abort any transmit and receive operations and put DMA
• • in idle state. AT and AR bits are cleared upon entering
• • in IDLE state. So poll those bits to verify operation.
• */

+static void abortdma(struct eth_device *dev) +{

• struct armdfec_device *darmdfec = to_darmdfec(dev);
• struct armdfec_reg *regs = darmdfec->regs;
• int delay;
• int maxretries = 40;
• do {

• writel(SDMA_CMD_AR | SDMA_CMD_AT, &regs->sdma_cmd);
  

• udelay(100);
  

• delay = 10;
  

• while ((readl(&regs->sdma_cmd) &
  

• 	(SDMA_CMD_AR | SDMA_CMD_AT))
  

• 	&& delay-- > 0) {
  

• 	udelay(10);
  

• }
  

• } while (maxretries-- > 0 && delay <= 0);

Didn't I comment on this one in V1?

Yes you did...

...

• if (maxretries <= 0)

• printf("%s : DMA Stuck\n", __func__);
  

+}

[...]

...

+int armada100_fec_register() +{

• struct armdfec_device *darmdfec;
• struct eth_device *dev;
• int phy_adr;
• darmdfec = malloc(sizeof(struct armdfec_device));
• if (!darmdfec)

• goto error;
  

• memset(darmdfec, 0, sizeof(struct armdfec_device));
• darmdfec->htpr = memalign(8, HASH_ADDR_TABLE_SIZE);
• if (!darmdfec->htpr)

• goto error;
  

• darmdfec->p_rxdesc = (struct rx_desc *) memalign(PKTALIGN,

• 	ARMDFEC_RXQ_DESC_ALIGNED_SIZE * RINGSZ + 1);
  

• if (!darmdfec->p_rxdesc)

• goto error;
  

• darmdfec->p_rxbuf = (u8 *) memalign(PKTALIGN,

• 	RINGSZ * PKTSIZE_ALIGN + 1);
  

Is the cast needed ? You should review your casts, most of them can be solved by using proper type!

Thats a serious issue with me I guess :)

...

• if (!darmdfec->p_rxbuf)

• goto error;
  

• darmdfec->p_aligned_txbuf = memalign(8, PKTSIZE_ALIGN);
• if (!darmdfec->p_aligned_txbuf)

• goto error;
  

• darmdfec->p_txdesc = (struct tx_desc *)

• memalign(PKTALIGN, sizeof(struct tx_desc) + 1);
  

• if (!darmdfec->p_txdesc)

• goto error;
  

• dev = &darmdfec->dev;
• /* Assign ARMADA100 Fast Ethernet Controller Base Address */
• darmdfec->regs = (void *) ARMD1_FEC_BASE;

Cheers!

Thanks, Ajay Bhargav