The Ethernet controller on the SiFive SoCs needs some special TX clock setup. Port the relevant Linux v5.12 bits to enable it. Tested on qemu-system-riscv64 -M sifive_u with dhcp. Signed-off-by: Ahmad Fatoum <a.fatoum@xxxxxxxxxxxxxx> --- drivers/net/macb.c | 113 +++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 113 insertions(+) diff --git a/drivers/net/macb.c b/drivers/net/macb.c index 14a0b45322bf..9c4fdbd5bc4f 100644 --- a/drivers/net/macb.c +++ b/drivers/net/macb.c @@ -52,6 +52,17 @@ #define TX_RING_BYTES (sizeof(struct macb_dma_desc) * TX_RING_SIZE) #define GEM_Q1_DESC_BYTES (sizeof(struct macb_dma_desc) * GEM_Q1_DESCS) +/* This structure is only used for MACB on SiFive FU540 devices */ +struct sifive_fu540_macb_mgmt { + void __iomem *reg; + unsigned long rate; + struct clk clk; +}; + +struct macb_config { + int (*txclk_init)(struct device_d *dev, struct clk **tx_clk); +}; + struct macb_device { void __iomem *regs; @@ -666,12 +677,101 @@ static void macb_init_rx_buffer_size(struct macb_device *bp, size_t size) size, bp->rx_buffer_size); } +static struct sifive_fu540_macb_mgmt *mgmt; + +static unsigned long fu540_macb_tx_recalc_rate(struct clk *clk, + unsigned long parent_rate) +{ + return mgmt->rate; +} + +static long fu540_macb_tx_round_rate(struct clk *clk, unsigned long rate, + unsigned long *parent_rate) +{ + if (WARN_ON(rate < 2500000)) + return 2500000; + else if (rate == 2500000) + return 2500000; + else if (WARN_ON(rate < 13750000)) + return 2500000; + else if (WARN_ON(rate < 25000000)) + return 25000000; + else if (rate == 25000000) + return 25000000; + else if (WARN_ON(rate < 75000000)) + return 25000000; + else if (WARN_ON(rate < 125000000)) + return 125000000; + else if (rate == 125000000) + return 125000000; + + WARN_ON(rate > 125000000); + + return 125000000; +} + +static int fu540_macb_tx_set_rate(struct clk *clk, unsigned long rate, + unsigned long parent_rate) +{ + rate = fu540_macb_tx_round_rate(clk, rate, &parent_rate); + if (rate != 125000000) + iowrite32(1, mgmt->reg); + else + iowrite32(0, mgmt->reg); + mgmt->rate = rate; + + return 0; +} + +static const struct clk_ops fu540_c000_ops = { + .recalc_rate = fu540_macb_tx_recalc_rate, + .round_rate = fu540_macb_tx_round_rate, + .set_rate = fu540_macb_tx_set_rate, +}; + +static int fu540_c000_txclk_init(struct device_d *dev, struct clk **tx_clk) +{ + struct clk *clk; + struct resource *res; + int err = 0; + + mgmt = xzalloc(sizeof(*mgmt)); + + res = dev_request_mem_resource(dev, 1); + if (IS_ERR(res)) + return PTR_ERR(res); + + mgmt->reg = IOMEM(res->start); + + clk = &mgmt->clk; + + clk->name = "sifive-gemgxl-mgmt"; + clk->ops = &fu540_c000_ops; + + err = clk_register(&mgmt->clk); + if (err) + return err; + + *tx_clk = &mgmt->clk; + + err = clk_enable(*tx_clk); + if (err) { + dev_err(dev, "failed to enable tx_clk (%u)\n", err); + *tx_clk = NULL; + return err; + } + + dev_info(dev, "Registered clk switch '%s'\n", clk->name); + return 0; +} + static int macb_probe(struct device_d *dev) { struct resource *iores; struct eth_device *edev; struct macb_device *macb; const char *pclk_name, *hclk_name; + const struct macb_config *config = NULL; u32 ncfgr; macb = xzalloc(sizeof(*macb)); @@ -725,6 +825,8 @@ static int macb_probe(struct device_d *dev) macb->phy_addr = -1; pclk_name = "pclk"; hclk_name = "hclk"; + + config = device_get_match_data(dev); } else { dev_err(dev, "macb: no platform_data\n"); return -ENODEV; @@ -767,6 +869,12 @@ static int macb_probe(struct device_d *dev) if (!IS_ERR(macb->rxclk)) clk_enable(macb->rxclk); + if (config) { + int ret = config->txclk_init(dev, &macb->txclk); + if (ret) + return ret; + } + macb->is_gem = read_is_gem(macb); if (macb_is_gem(macb)) @@ -808,12 +916,17 @@ static void macb_remove(struct device_d *dev) macb_halt(&macb->netdev); } +static const struct macb_config fu540_c000_config = { + .txclk_init = fu540_c000_txclk_init, +}; + static const struct of_device_id macb_dt_ids[] = { { .compatible = "cdns,at91sam9260-macb",}, { .compatible = "atmel,sama5d2-gem",}, { .compatible = "atmel,sama5d3-gem",}, { .compatible = "cdns,zynq-gem",}, { .compatible = "cdns,zynqmp-gem",}, + { .compatible = "sifive,fu540-c000-gem", .data = &fu540_c000_config }, { /* sentinel */ } }; -- 2.29.2 _______________________________________________ barebox mailing list barebox@xxxxxxxxxxxxxxxxxxx http://lists.infradead.org/mailman/listinfo/barebox