Re: [PATCH v2 2/5] can: rcar_canfd: Add support for RZ/G2L family
flat view
From: Geert Uytterhoeven <geert@linux-m68k.org>
Date: 2021-07-20 10:33:33
Also in:
linux-can, linux-clk, linux-devicetree, linux-renesas-soc, lkml
Hi Prabhakar, On Mon, Jul 19, 2021 at 4:39 PM Lad Prabhakar [off-list ref] wrote:
CANFD block on RZ/G2L SoC is almost identical to one found on R-Car Gen3 SoC's. On RZ/G2L SoC interrupt sources for each channel are split into different sources and the IP doesn't divide (1/2) CANFD clock within the IP. This patch adds compatible string for RZ/G2L family and registers the irq handlers required for CANFD operation. IRQ numbers are now fetched based on names instead of indices. For backward compatibility on non RZ/G2L SoC's we fallback reading based on indices. Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com> Reviewed-by: Biju Das <biju.das.jz@bp.renesas.com>
Thanks for your patch!
quoted hunk ↗ jump to hunk
--- a/drivers/net/can/rcar/rcar_canfd.c +++ b/drivers/net/can/rcar/rcar_canfd.c@@ -37,9 +37,15 @@ #include <linux/bitmap.h> #include <linux/bitops.h> #include <linux/iopoll.h> +#include <linux/reset.h> #define RCANFD_DRV_NAME "rcar_canfd" +enum rcanfd_chip_id { + RENESAS_RCAR_GEN3 = 0, + RENESAS_RZG2L, +}; + /* Global register bits */ /* RSCFDnCFDGRMCFG */@@ -513,6 +519,9 @@ struct rcar_canfd_global { enum rcar_canfd_fcanclk fcan; /* CANFD or Ext clock */ unsigned long channels_mask; /* Enabled channels mask */ bool fdmode; /* CAN FD or Classical CAN only mode */ + struct reset_control *rstc1; /* Pointer to reset source1 */ + struct reset_control *rstc2; /* Pointer to reset source2 */
Are these comments helpful? IMHO they're stating the obvious.
quoted hunk ↗ jump to hunk
+ enum rcanfd_chip_id chip_id; }; /* CAN FD mode nominal rate constants */@@ -1577,6 +1586,45 @@ static int rcar_canfd_channel_probe(struct rcar_canfd_global *gpriv, u32 ch, priv->can.clock.freq = fcan_freq; dev_info(&pdev->dev, "can_clk rate is %u\n", priv->can.clock.freq); + if (gpriv->chip_id == RENESAS_RZG2L) { + char *irq_name; + int err_irq; + int tx_irq; + + err_irq = platform_get_irq_byname(pdev, ch == 0 ? "can0_error" : "can1_error"); + if (err_irq < 0) { + err = err_irq; + goto fail; + } + + tx_irq = platform_get_irq_byname(pdev, ch == 0 ? "can0_tx" : "can1_tx"); + if (tx_irq < 0) { + err = tx_irq; + goto fail; + } + + irq_name = devm_kasprintf(&pdev->dev, GFP_KERNEL, + "canfd.chnerr%d", ch);
if (!irq_name) {
ret = -ENOMEM;
goto fail;
}
quoted hunk ↗ jump to hunk
+ err = devm_request_irq(&pdev->dev, err_irq, + rcar_canfd_channel_interrupt, 0, + irq_name, gpriv); + if (err) { + dev_err(&pdev->dev, "devm_request_irq CH Err(%d) failed, error %d\n", + err_irq, err); + goto fail; + } + irq_name = devm_kasprintf(&pdev->dev, GFP_KERNEL, + "canfd.chntx%d", ch);
Likewise.
quoted hunk ↗ jump to hunk
+ err = devm_request_irq(&pdev->dev, tx_irq, + rcar_canfd_channel_interrupt, 0, + irq_name, gpriv); + if (err) { + dev_err(&pdev->dev, "devm_request_irq Tx (%d) failed, error %d\n", + tx_irq, err); + goto fail; + } + } + if (gpriv->fdmode) { priv->can.bittiming_const = &rcar_canfd_nom_bittiming_const; priv->can.data_bittiming_const =
quoted hunk ↗ jump to hunk
@@ -1649,27 +1700,64 @@ static int rcar_canfd_probe(struct platform_device *pdev) if (of_child && of_device_is_available(of_child)) channels_mask |= BIT(1); /* Channel 1 */ - ch_irq = platform_get_irq(pdev, 0); - if (ch_irq < 0) { - err = ch_irq; - goto fail_dev; - } + if (chip_id == RENESAS_RCAR_GEN3) { + ch_irq = platform_get_irq_byname(pdev, "ch_int");
platform_get_irq_byname_optional()? Unless you want to urge people to update their DTB.
quoted hunk ↗ jump to hunk
+ if (ch_irq < 0) { + /* For backward compatibility get irq by index */ + ch_irq = platform_get_irq(pdev, 0); + if (ch_irq < 0) + return ch_irq; + } - g_irq = platform_get_irq(pdev, 1); - if (g_irq < 0) { - err = g_irq; - goto fail_dev; + g_irq = platform_get_irq_byname(pdev, "g_int");
Likewise,
quoted hunk ↗ jump to hunk
+ if (g_irq < 0) { + /* For backward compatibility get irq by index */ + g_irq = platform_get_irq(pdev, 1); + if (g_irq < 0) + return g_irq; + } + } else { + g_irq = platform_get_irq_byname(pdev, "g_error"); + if (g_irq < 0) + return g_irq; + + g_rx_irq = platform_get_irq_byname(pdev, "g_rx_fifo"); + if (g_rx_irq < 0) + return g_rx_irq; }
Gr{oetje,eeting}s,
Geert
--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org
In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
-- Linus Torvalds