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Message-ID: <CAMZ6RqKr06KSMrKaB2h7iSDzOtgVKS+grPtf+bVrfpFaBai74w@mail.gmail.com>
Date: Mon, 31 Jan 2022 11:08:12 +0900
From: Vincent MAILHOL <mailhol.vincent@...adoo.fr>
To: Ulrich Hecht <uli+renesas@...nd.eu>
Cc: linux-renesas-soc@...r.kernel.org, netdev@...r.kernel.org,
davem@...emloft.net, linux-can@...r.kernel.org,
prabhakar.mahadev-lad.rj@...renesas.com,
biju.das.jz@...renesas.com, wsa@...nel.org,
yoshihiro.shimoda.uh@...esas.com, wg@...ndegger.com,
mkl@...gutronix.de, kuba@...nel.org, socketcan@...tkopp.net,
geert@...ux-m68k.org, kieran.bingham@...asonboard.com
Subject: Re: [PATCH v2 2/5] can: rcar_canfd: Add support for r8a779a0 SoC
Hi Ulrich,
On Wed. 12 Jan 2022 at 01:22, Ulrich Hecht <uli+renesas@...nd.eu> a wrote:
>
> Adds support for the CANFD IP variant in the V3U SoC.
>
> Differences to controllers in other SoCs are limited to an increase in
> the number of channels from two to eight, an absence of dedicated
> registers for "classic" CAN mode, and a number of differences in magic
> numbers (register offsets and layouts).
>
> Inspired by BSP patch by Kazuya Mizuguchi.
>
> Signed-off-by: Ulrich Hecht <uli+renesas@...nd.eu>
> ---
> drivers/net/can/rcar/rcar_canfd.c | 231 ++++++++++++++++++++----------
> 1 file changed, 153 insertions(+), 78 deletions(-)
>
> diff --git a/drivers/net/can/rcar/rcar_canfd.c b/drivers/net/can/rcar/rcar_canfd.c
> index ff9d0f5ae0dd..b1c9870d2a82 100644
> --- a/drivers/net/can/rcar/rcar_canfd.c
> +++ b/drivers/net/can/rcar/rcar_canfd.c
> @@ -44,10 +44,13 @@
> enum rcanfd_chip_id {
> RENESAS_RCAR_GEN3 = 0,
> RENESAS_RZG2L,
> + RENESAS_R8A779A0,
> };
>
> /* Global register bits */
>
> +#define IS_V3U (gpriv->chip_id == RENESAS_R8A779A0)
> +
> /* RSCFDnCFDGRMCFG */
> #define RCANFD_GRMCFG_RCMC BIT(0)
>
> @@ -79,6 +82,7 @@ enum rcanfd_chip_id {
> #define RCANFD_GSTS_GNOPM (BIT(0) | BIT(1) | BIT(2) | BIT(3))
>
> /* RSCFDnCFDGERFL / RSCFDnGERFL */
> +#define RCANFD_GERFL_EEF0_7 GENMASK(23, 16)
> #define RCANFD_GERFL_EEF1 BIT(17)
> #define RCANFD_GERFL_EEF0 BIT(16)
> #define RCANFD_GERFL_CMPOF BIT(3) /* CAN FD only */
> @@ -86,20 +90,24 @@ enum rcanfd_chip_id {
> #define RCANFD_GERFL_MES BIT(1)
> #define RCANFD_GERFL_DEF BIT(0)
>
I have a couple of comments *in addition* to Mark’s one on the IS_V3U.
>
> -#define RCANFD_GERFL_ERR(gpriv, x) ((x) & (RCANFD_GERFL_EEF1 |\
> - RCANFD_GERFL_EEF0 | RCANFD_GERFL_MES |\
> - (gpriv->fdmode ?\
> - RCANFD_GERFL_CMPOF : 0)))
> +#define RCANFD_GERFL_ERR(gpriv, x) ((x) & ((IS_V3U ? RCANFD_GERFL_EEF0_7 : \
> + (RCANFD_GERFL_EEF0 | RCANFD_GERFL_EEF1)) | \
> + RCANFD_GERFL_MES | ((gpriv)->fdmode ? \
> + RCANFD_GERFL_CMPOF : 0)))
The indentation is hard to read. Here you follow the 80
characters per line, but the indentation does not highlight
the logic of the different branches of the ternary operator.
Does something in this fashion make more sense?
+#define RCANFD_GERFL_ERR(gpriv, x) \
+( \
+ (x) & ((IS_V3U ? RCANFD_GERFL_EEF0_7 : \
+ RCANFD_GERFL_EEF0 | RCANFD_GERFL_EEF1) | \
+ RCANFD_GERFL_MES | \
+ ((gpriv)->fdmode ? RCANFD_GERFL_CMPOF : 0)) \
+)
(I guess that my mailer will break all the tabulations, sorry for that).
> /* AFL Rx rules registers */
>
> /* RSCFDnCFDGAFLCFG0 / RSCFDnGAFLCFG0 */
> -#define RCANFD_GAFLCFG_SETRNC(n, x) (((x) & 0xff) << (24 - n * 8))
> -#define RCANFD_GAFLCFG_GETRNC(n, x) (((x) >> (24 - n * 8)) & 0xff)
> +#define RCANFD_GAFLCFG_SETRNC(n, x) (((x) & (IS_V3U ? 0x1ff : 0xff)) << \
> + ((IS_V3U ? 16 : 24) - (n) * (IS_V3U ? \
> + 16 : 8)))
> +#define RCANFD_GAFLCFG_GETRNC(n, x) (((x) >> ((IS_V3U ? 16 : 24) - (n) * \
> + (IS_V3U ? 16 : 8))) & \
> + (IS_V3U ? 0x1ff : 0xff))
Similarly, here, you try to factorize all the code, but this is not
helping readability.
What do you think of doing this instead:
+/* RSCFDnCFDGAFLCFG0 / RSCFDnGAFLCFG0 */
+#define RCANFD_GAFLCFG_SETRNC(n, x) \
+ (IS_V3U ? \
+ ((x) & 0x1ff) << (16 - n * 16) : \
+ ((x) & 0xff) << (24 - n * 8))
Same comments apply to other macros as well.
> /* RSCFDnCFDGAFLECTR / RSCFDnGAFLECTR */
> #define RCANFD_GAFLECTR_AFLDAE BIT(8)
> -#define RCANFD_GAFLECTR_AFLPN(x) ((x) & 0x1f)
> +#define RCANFD_GAFLECTR_AFLPN(x) ((x) & (IS_V3U ? 0x7f : 0x1f))
>
> /* RSCFDnCFDGAFLIDj / RSCFDnGAFLIDj */
> #define RCANFD_GAFLID_GAFLLB BIT(29)
> @@ -116,9 +124,12 @@ enum rcanfd_chip_id {
> #define RCANFD_CFG_BRP(x) (((x) & 0x3ff) << 0)
>
> /* RSCFDnCFDCmNCFG - CAN FD only */
> -#define RCANFD_NCFG_NTSEG2(x) (((x) & 0x1f) << 24)
> -#define RCANFD_NCFG_NTSEG1(x) (((x) & 0x7f) << 16)
> -#define RCANFD_NCFG_NSJW(x) (((x) & 0x1f) << 11)
> +#define RCANFD_NCFG_NTSEG2(x) (((x) & (IS_V3U ? 0x7f : 0x1f)) << \
> + (IS_V3U ? 25 : 24))
> +#define RCANFD_NCFG_NTSEG1(x) (((x) & (IS_V3U ? 0xff : 0x7f)) << \
> + (IS_V3U ? 17 : 16))
> +#define RCANFD_NCFG_NSJW(x) (((x) & (IS_V3U ? 0x7f : 0x1f)) << \
> + (IS_V3U ? 10 : 11))
> #define RCANFD_NCFG_NBRP(x) (((x) & 0x3ff) << 0)
>
> /* RSCFDnCFDCmCTR / RSCFDnCmCTR */
> @@ -180,11 +191,15 @@ enum rcanfd_chip_id {
>
> /* RSCFDnCFDCmDCFG */
> #define RCANFD_DCFG_DSJW(x) (((x) & 0x7) << 24)
> -#define RCANFD_DCFG_DTSEG2(x) (((x) & 0x7) << 20)
> -#define RCANFD_DCFG_DTSEG1(x) (((x) & 0xf) << 16)
> +#define RCANFD_DCFG_DTSEG2(x) (((x) & (IS_V3U ? 0x0f : 0x7)) << \
> + (IS_V3U ? 16 : 20))
> +#define RCANFD_DCFG_DTSEG1(x) (((x) & (IS_V3U ? 0x1f : 0xf)) << \
> + (IS_V3U ? 8 : 16))
> #define RCANFD_DCFG_DBRP(x) (((x) & 0xff) << 0)
>
> /* RSCFDnCFDCmFDCFG */
> +#define RCANFD_FDCFG_CLOE BIT(30)
> +#define RCANFD_FDCFG_FDOE BIT(28)
> #define RCANFD_FDCFG_TDCE BIT(9)
> #define RCANFD_FDCFG_TDCOC BIT(8)
> #define RCANFD_FDCFG_TDCO(x) (((x) & 0x7f) >> 16)
> @@ -219,10 +234,10 @@ enum rcanfd_chip_id {
> /* Common FIFO bits */
>
> /* RSCFDnCFDCFCCk */
> -#define RCANFD_CFCC_CFTML(x) (((x) & 0xf) << 20)
> -#define RCANFD_CFCC_CFM(x) (((x) & 0x3) << 16)
> +#define RCANFD_CFCC_CFTML(x) (((x) & 0xf) << (IS_V3U ? 16 : 20))
> +#define RCANFD_CFCC_CFM(x) (((x) & 0x3) << (IS_V3U ? 8 : 16))
> #define RCANFD_CFCC_CFIM BIT(12)
> -#define RCANFD_CFCC_CFDC(x) (((x) & 0x7) << 8)
> +#define RCANFD_CFCC_CFDC(x) (((x) & 0x7) << (IS_V3U ? 21 : 8))
> #define RCANFD_CFCC_CFPLS(x) (((x) & 0x7) << 4)
> #define RCANFD_CFCC_CFTXIE BIT(2)
> #define RCANFD_CFCC_CFE BIT(0)
> @@ -282,33 +297,32 @@ enum rcanfd_chip_id {
> #define RCANFD_GTSC (0x0094)
> /* RSCFDnCFDGAFLECTR / RSCFDnGAFLECTR */
> #define RCANFD_GAFLECTR (0x0098)
> -/* RSCFDnCFDGAFLCFG0 / RSCFDnGAFLCFG0 */
> -#define RCANFD_GAFLCFG0 (0x009c)
> -/* RSCFDnCFDGAFLCFG1 / RSCFDnGAFLCFG1 */
> -#define RCANFD_GAFLCFG1 (0x00a0)
> +/* RSCFDnCFDGAFLCFG / RSCFDnGAFLCFG */
> +#define RCANFD_GAFLCFG(ch) (0x009c + (0x04 * ((ch) / 2)))
> /* RSCFDnCFDRMNB / RSCFDnRMNB */
> #define RCANFD_RMNB (0x00a4)
> /* RSCFDnCFDRMND / RSCFDnRMND */
> #define RCANFD_RMND(y) (0x00a8 + (0x04 * (y)))
>
> /* RSCFDnCFDRFCCx / RSCFDnRFCCx */
> -#define RCANFD_RFCC(x) (0x00b8 + (0x04 * (x)))
> +#define RCANFD_RFCC(x) ((IS_V3U ? 0x00c0 : 0x00b8) + \
> + (0x04 * (x)))
> /* RSCFDnCFDRFSTSx / RSCFDnRFSTSx */
> -#define RCANFD_RFSTS(x) (0x00d8 + (0x04 * (x)))
> +#define RCANFD_RFSTS(x) (RCANFD_RFCC(x) + 0x20)
> /* RSCFDnCFDRFPCTRx / RSCFDnRFPCTRx */
> -#define RCANFD_RFPCTR(x) (0x00f8 + (0x04 * (x)))
> +#define RCANFD_RFPCTR(x) (RCANFD_RFCC(x) + 0x40)
>
> /* Common FIFO Control registers */
>
> /* RSCFDnCFDCFCCx / RSCFDnCFCCx */
> -#define RCANFD_CFCC(ch, idx) (0x0118 + (0x0c * (ch)) + \
> - (0x04 * (idx)))
> +#define RCANFD_CFCC(ch, idx) ((IS_V3U ? 0x0120 : 0x0118) + \
> + (0x0c * (ch)) + (0x04 * (idx)))
> /* RSCFDnCFDCFSTSx / RSCFDnCFSTSx */
> -#define RCANFD_CFSTS(ch, idx) (0x0178 + (0x0c * (ch)) + \
> - (0x04 * (idx)))
> +#define RCANFD_CFSTS(ch, idx) ((IS_V3U ? 0x01e0 : 0x0178) + \
> + (0x0c * (ch)) + (0x04 * (idx)))
> /* RSCFDnCFDCFPCTRx / RSCFDnCFPCTRx */
> -#define RCANFD_CFPCTR(ch, idx) (0x01d8 + (0x0c * (ch)) + \
> - (0x04 * (idx)))
> +#define RCANFD_CFPCTR(ch, idx) ((IS_V3U ? 0x0240 : 0x01d8) + \
> + (0x0c * (ch)) + (0x04 * (idx)))
>
> /* RSCFDnCFDFESTS / RSCFDnFESTS */
> #define RCANFD_FESTS (0x0238)
> @@ -415,6 +429,12 @@ enum rcanfd_chip_id {
> /* RSCFDnRPGACCr */
> #define RCANFD_C_RPGACC(r) (0x1900 + (0x04 * (r)))
>
> +/* R-Car V3U Classical and CAN FD mode specific register map */
> +#define RCANFD_V3U_CFDCFG (0x1314)
> +#define RCANFD_V3U_DCFG(m) (0x1400 + (0x20 * (m)))
> +
> +#define RCANFD_V3U_GAFL_OFFSET (0x1800)
> +
> /* CAN FD mode specific register map */
>
> /* RSCFDnCFDCmXXX -> RCANFD_F_XXX(m) */
> @@ -434,7 +454,7 @@ enum rcanfd_chip_id {
> #define RCANFD_F_RMDF(q, b) (0x200c + (0x04 * (b)) + (0x20 * (q)))
>
> /* RSCFDnCFDRFXXx -> RCANFD_F_RFXX(x) */
> -#define RCANFD_F_RFOFFSET (0x3000)
> +#define RCANFD_F_RFOFFSET (IS_V3U ? 0x6000 : 0x3000)
> #define RCANFD_F_RFID(x) (RCANFD_F_RFOFFSET + (0x80 * (x)))
> #define RCANFD_F_RFPTR(x) (RCANFD_F_RFOFFSET + 0x04 + \
> (0x80 * (x)))
> @@ -444,7 +464,7 @@ enum rcanfd_chip_id {
> (0x80 * (x)) + (0x04 * (df)))
>
> /* RSCFDnCFDCFXXk -> RCANFD_F_CFXX(ch, k) */
> -#define RCANFD_F_CFOFFSET (0x3400)
> +#define RCANFD_F_CFOFFSET (IS_V3U ? 0x6400 : 0x3400)
> #define RCANFD_F_CFID(ch, idx) (RCANFD_F_CFOFFSET + (0x180 * (ch)) + \
> (0x80 * (idx)))
> #define RCANFD_F_CFPTR(ch, idx) (RCANFD_F_CFOFFSET + 0x04 + \
> @@ -470,7 +490,7 @@ enum rcanfd_chip_id {
> #define RCANFD_FIFO_DEPTH 8 /* Tx FIFO depth */
> #define RCANFD_NAPI_WEIGHT 8 /* Rx poll quota */
>
> -#define RCANFD_NUM_CHANNELS 2 /* Two channels max */
> +#define RCANFD_NUM_CHANNELS 8 /* Eight channels max */
> #define RCANFD_CHANNELS_MASK BIT((RCANFD_NUM_CHANNELS) - 1)
>
> #define RCANFD_GAFL_PAGENUM(entry) ((entry) / 16)
> @@ -522,6 +542,7 @@ struct rcar_canfd_global {
> struct reset_control *rstc1;
> struct reset_control *rstc2;
> enum rcanfd_chip_id chip_id;
> + u32 max_channels;
> };
>
> /* CAN FD mode nominal rate constants */
> @@ -629,6 +650,25 @@ static void rcar_canfd_tx_failure_cleanup(struct net_device *ndev)
> can_free_echo_skb(ndev, i, NULL);
> }
>
> +static void rcar_canfd_set_mode(struct rcar_canfd_global *gpriv)
> +{
> + if (gpriv->chip_id == RENESAS_R8A779A0) {
> + if (gpriv->fdmode)
> + rcar_canfd_set_bit(gpriv->base, RCANFD_V3U_CFDCFG,
> + RCANFD_FDCFG_FDOE);
> + else
> + rcar_canfd_set_bit(gpriv->base, RCANFD_V3U_CFDCFG,
> + RCANFD_FDCFG_CLOE);
> + } else {
> + if (gpriv->fdmode)
> + rcar_canfd_set_bit(gpriv->base, RCANFD_GRMCFG,
> + RCANFD_GRMCFG_RCMC);
> + else
> + rcar_canfd_clear_bit(gpriv->base, RCANFD_GRMCFG,
> + RCANFD_GRMCFG_RCMC);
> + }
> +}
> +
> static int rcar_canfd_reset_controller(struct rcar_canfd_global *gpriv)
> {
> u32 sts, ch;
> @@ -661,15 +701,10 @@ static int rcar_canfd_reset_controller(struct rcar_canfd_global *gpriv)
> rcar_canfd_write(gpriv->base, RCANFD_GERFL, 0x0);
>
> /* Set the controller into appropriate mode */
> - if (gpriv->fdmode)
> - rcar_canfd_set_bit(gpriv->base, RCANFD_GRMCFG,
> - RCANFD_GRMCFG_RCMC);
> - else
> - rcar_canfd_clear_bit(gpriv->base, RCANFD_GRMCFG,
> - RCANFD_GRMCFG_RCMC);
> + rcar_canfd_set_mode(gpriv);
>
> /* Transition all Channels to reset mode */
> - for_each_set_bit(ch, &gpriv->channels_mask, RCANFD_NUM_CHANNELS) {
> + for_each_set_bit(ch, &gpriv->channels_mask, gpriv->max_channels) {
> rcar_canfd_clear_bit(gpriv->base,
> RCANFD_CCTR(ch), RCANFD_CCTR_CSLPR);
>
> @@ -710,7 +745,7 @@ static void rcar_canfd_configure_controller(struct rcar_canfd_global *gpriv)
> rcar_canfd_set_bit(gpriv->base, RCANFD_GCFG, cfg);
>
> /* Channel configuration settings */
> - for_each_set_bit(ch, &gpriv->channels_mask, RCANFD_NUM_CHANNELS) {
> + for_each_set_bit(ch, &gpriv->channels_mask, gpriv->max_channels) {
> rcar_canfd_set_bit(gpriv->base, RCANFD_CCTR(ch),
> RCANFD_CCTR_ERRD);
> rcar_canfd_update_bit(gpriv->base, RCANFD_CCTR(ch),
> @@ -730,7 +765,7 @@ static void rcar_canfd_configure_afl_rules(struct rcar_canfd_global *gpriv,
> start = 0; /* Channel 0 always starts from 0th rule */
> } else {
> /* Get number of Channel 0 rules and adjust */
> - cfg = rcar_canfd_read(gpriv->base, RCANFD_GAFLCFG0);
> + cfg = rcar_canfd_read(gpriv->base, RCANFD_GAFLCFG(ch));
> start = RCANFD_GAFLCFG_GETRNC(0, cfg);
> }
>
> @@ -741,12 +776,16 @@ static void rcar_canfd_configure_afl_rules(struct rcar_canfd_global *gpriv,
> RCANFD_GAFLECTR_AFLDAE));
>
> /* Write number of rules for channel */
> - rcar_canfd_set_bit(gpriv->base, RCANFD_GAFLCFG0,
> + rcar_canfd_set_bit(gpriv->base, RCANFD_GAFLCFG(ch),
> RCANFD_GAFLCFG_SETRNC(ch, num_rules));
> - if (gpriv->fdmode)
> - offset = RCANFD_F_GAFL_OFFSET;
> - else
> - offset = RCANFD_C_GAFL_OFFSET;
> + if (gpriv->chip_id == RENESAS_R8A779A0) {
> + offset = RCANFD_V3U_GAFL_OFFSET;
> + } else {
> + if (gpriv->fdmode)
> + offset = RCANFD_F_GAFL_OFFSET;
> + else
> + offset = RCANFD_C_GAFL_OFFSET;
> + }
>
> /* Accept all IDs */
> rcar_canfd_write(gpriv->base, RCANFD_GAFLID(offset, start), 0);
> @@ -755,8 +794,8 @@ static void rcar_canfd_configure_afl_rules(struct rcar_canfd_global *gpriv,
> /* Any data length accepted */
> rcar_canfd_write(gpriv->base, RCANFD_GAFLP0(offset, start), 0);
> /* Place the msg in corresponding Rx FIFO entry */
> - rcar_canfd_write(gpriv->base, RCANFD_GAFLP1(offset, start),
> - RCANFD_GAFLP1_GAFLFDP(ridx));
> + rcar_canfd_set_bit(gpriv->base, RCANFD_GAFLP1(offset, start),
> + RCANFD_GAFLP1_GAFLFDP(ridx));
>
> /* Disable write access to page */
> rcar_canfd_clear_bit(gpriv->base,
> @@ -1041,6 +1080,7 @@ static void rcar_canfd_error(struct net_device *ndev, u32 cerfl,
> static void rcar_canfd_tx_done(struct net_device *ndev)
> {
> struct rcar_canfd_channel *priv = netdev_priv(ndev);
> + struct rcar_canfd_global *gpriv = priv->gpriv;
> struct net_device_stats *stats = &ndev->stats;
> u32 sts;
> unsigned long flags;
> @@ -1096,7 +1136,7 @@ static irqreturn_t rcar_canfd_global_err_interrupt(int irq, void *dev_id)
> struct rcar_canfd_global *gpriv = dev_id;
> u32 ch;
>
> - for_each_set_bit(ch, &gpriv->channels_mask, RCANFD_NUM_CHANNELS)
> + for_each_set_bit(ch, &gpriv->channels_mask, gpriv->max_channels)
> rcar_canfd_handle_global_err(gpriv, ch);
>
> return IRQ_HANDLED;
> @@ -1126,7 +1166,7 @@ static irqreturn_t rcar_canfd_global_receive_fifo_interrupt(int irq, void *dev_i
> struct rcar_canfd_global *gpriv = dev_id;
> u32 ch;
>
> - for_each_set_bit(ch, &gpriv->channels_mask, RCANFD_NUM_CHANNELS)
> + for_each_set_bit(ch, &gpriv->channels_mask, gpriv->max_channels)
> rcar_canfd_handle_global_receive(gpriv, ch);
>
> return IRQ_HANDLED;
> @@ -1140,7 +1180,7 @@ static irqreturn_t rcar_canfd_global_interrupt(int irq, void *dev_id)
> /* Global error interrupts still indicate a condition specific
> * to a channel. RxFIFO interrupt is a global interrupt.
> */
> - for_each_set_bit(ch, &gpriv->channels_mask, RCANFD_NUM_CHANNELS) {
> + for_each_set_bit(ch, &gpriv->channels_mask, gpriv->max_channels) {
> rcar_canfd_handle_global_err(gpriv, ch);
> rcar_canfd_handle_global_receive(gpriv, ch);
> }
> @@ -1198,7 +1238,7 @@ static irqreturn_t rcar_canfd_channel_tx_interrupt(int irq, void *dev_id)
> struct rcar_canfd_global *gpriv = dev_id;
> u32 ch;
>
> - for_each_set_bit(ch, &gpriv->channels_mask, RCANFD_NUM_CHANNELS)
> + for_each_set_bit(ch, &gpriv->channels_mask, gpriv->max_channels)
> rcar_canfd_handle_channel_tx(gpriv, ch);
>
> return IRQ_HANDLED;
> @@ -1230,7 +1270,7 @@ static irqreturn_t rcar_canfd_channel_err_interrupt(int irq, void *dev_id)
> struct rcar_canfd_global *gpriv = dev_id;
> u32 ch;
>
> - for_each_set_bit(ch, &gpriv->channels_mask, RCANFD_NUM_CHANNELS)
> + for_each_set_bit(ch, &gpriv->channels_mask, gpriv->max_channels)
> rcar_canfd_handle_channel_err(gpriv, ch);
>
> return IRQ_HANDLED;
> @@ -1242,7 +1282,7 @@ static irqreturn_t rcar_canfd_channel_interrupt(int irq, void *dev_id)
> u32 ch;
>
> /* Common FIFO is a per channel resource */
> - for_each_set_bit(ch, &gpriv->channels_mask, RCANFD_NUM_CHANNELS) {
> + for_each_set_bit(ch, &gpriv->channels_mask, gpriv->max_channels) {
> rcar_canfd_handle_channel_err(gpriv, ch);
> rcar_canfd_handle_channel_tx(gpriv, ch);
> }
> @@ -1253,6 +1293,7 @@ static irqreturn_t rcar_canfd_channel_interrupt(int irq, void *dev_id)
> static void rcar_canfd_set_bittiming(struct net_device *dev)
> {
> struct rcar_canfd_channel *priv = netdev_priv(dev);
> + struct rcar_canfd_global *gpriv = priv->gpriv;
> const struct can_bittiming *bt = &priv->can.bittiming;
> const struct can_bittiming *dbt = &priv->can.data_bittiming;
> u16 brp, sjw, tseg1, tseg2;
> @@ -1288,8 +1329,17 @@ static void rcar_canfd_set_bittiming(struct net_device *dev)
> brp, sjw, tseg1, tseg2);
> } else {
> /* Classical CAN only mode */
> - cfg = (RCANFD_CFG_TSEG1(tseg1) | RCANFD_CFG_BRP(brp) |
> - RCANFD_CFG_SJW(sjw) | RCANFD_CFG_TSEG2(tseg2));
> + if (gpriv->chip_id == RENESAS_R8A779A0) {
> + cfg = (RCANFD_NCFG_NTSEG1(tseg1) |
> + RCANFD_NCFG_NBRP(brp) |
> + RCANFD_NCFG_NSJW(sjw) |
> + RCANFD_NCFG_NTSEG2(tseg2));
> + } else {
> + cfg = (RCANFD_CFG_TSEG1(tseg1) |
> + RCANFD_CFG_BRP(brp) |
> + RCANFD_CFG_SJW(sjw) |
> + RCANFD_CFG_TSEG2(tseg2));
> + }
>
> rcar_canfd_write(priv->base, RCANFD_CCFG(ch), cfg);
> netdev_dbg(priv->ndev,
> @@ -1301,6 +1351,7 @@ static void rcar_canfd_set_bittiming(struct net_device *dev)
> static int rcar_canfd_start(struct net_device *ndev)
> {
> struct rcar_canfd_channel *priv = netdev_priv(ndev);
> + struct rcar_canfd_global *gpriv = priv->gpriv;
> int err = -EOPNOTSUPP;
> u32 sts, ch = priv->channel;
> u32 ridx = ch + RCANFD_RFFIFO_IDX;
> @@ -1372,6 +1423,7 @@ static int rcar_canfd_open(struct net_device *ndev)
> static void rcar_canfd_stop(struct net_device *ndev)
> {
> struct rcar_canfd_channel *priv = netdev_priv(ndev);
> + struct rcar_canfd_global *gpriv = priv->gpriv;
> int err;
> u32 sts, ch = priv->channel;
> u32 ridx = ch + RCANFD_RFFIFO_IDX;
> @@ -1415,6 +1467,7 @@ static netdev_tx_t rcar_canfd_start_xmit(struct sk_buff *skb,
> struct net_device *ndev)
> {
> struct rcar_canfd_channel *priv = netdev_priv(ndev);
> + struct rcar_canfd_global *gpriv = priv->gpriv;
> struct canfd_frame *cf = (struct canfd_frame *)skb->data;
> u32 sts = 0, id, dlc;
> unsigned long flags;
> @@ -1435,13 +1488,15 @@ static netdev_tx_t rcar_canfd_start_xmit(struct sk_buff *skb,
>
> dlc = RCANFD_CFPTR_CFDLC(can_fd_len2dlc(cf->len));
>
> - if (priv->can.ctrlmode & CAN_CTRLMODE_FD) {
> + if ((priv->can.ctrlmode & CAN_CTRLMODE_FD) ||
> + gpriv->chip_id == RENESAS_R8A779A0) {
> rcar_canfd_write(priv->base,
> RCANFD_F_CFID(ch, RCANFD_CFFIFO_IDX), id);
> rcar_canfd_write(priv->base,
> RCANFD_F_CFPTR(ch, RCANFD_CFFIFO_IDX), dlc);
>
> - if (can_is_canfd_skb(skb)) {
> + if ((priv->can.ctrlmode & CAN_CTRLMODE_FD) &&
> + can_is_canfd_skb(skb)) {
Could you explain why this additional check is needed?
My understanding is that can_is_canfd_skb(skb) being true implies
that the CAN_CTRLMODE_FD flag is set.
> /* CAN FD frame format */
> sts |= RCANFD_CFFDCSTS_CFFDF;
> if (cf->flags & CANFD_BRS)
> @@ -1488,22 +1543,29 @@ static netdev_tx_t rcar_canfd_start_xmit(struct sk_buff *skb,
> static void rcar_canfd_rx_pkt(struct rcar_canfd_channel *priv)
> {
> struct net_device_stats *stats = &priv->ndev->stats;
> + struct rcar_canfd_global *gpriv = priv->gpriv;
> struct canfd_frame *cf;
> struct sk_buff *skb;
> u32 sts = 0, id, dlc;
> u32 ch = priv->channel;
> u32 ridx = ch + RCANFD_RFFIFO_IDX;
>
> - if (priv->can.ctrlmode & CAN_CTRLMODE_FD) {
> + if ((priv->can.ctrlmode & CAN_CTRLMODE_FD) ||
> + gpriv->chip_id == RENESAS_R8A779A0) {
I guess that this is linked to the above comment. Does the
R8A779A0 chip support CAN-FD? If yes, why not simply use the
CAN_CTRLMODE_FD instead of adding this additional check?
> id = rcar_canfd_read(priv->base, RCANFD_F_RFID(ridx));
> dlc = rcar_canfd_read(priv->base, RCANFD_F_RFPTR(ridx));
>
> sts = rcar_canfd_read(priv->base, RCANFD_F_RFFDSTS(ridx));
> - if (sts & RCANFD_RFFDSTS_RFFDF)
> - skb = alloc_canfd_skb(priv->ndev, &cf);
> - else
> + if (priv->can.ctrlmode & CAN_CTRLMODE_FD) {
> + if (sts & RCANFD_RFFDSTS_RFFDF)
> + skb = alloc_canfd_skb(priv->ndev, &cf);
> + else
> + skb = alloc_can_skb(priv->ndev,
> + (struct can_frame **)&cf);
> + } else {
> skb = alloc_can_skb(priv->ndev,
> (struct can_frame **)&cf);
> + }
> } else {
> id = rcar_canfd_read(priv->base, RCANFD_C_RFID(ridx));
> dlc = rcar_canfd_read(priv->base, RCANFD_C_RFPTR(ridx));
> @@ -1541,10 +1603,16 @@ static void rcar_canfd_rx_pkt(struct rcar_canfd_channel *priv)
> }
> } else {
> cf->len = can_cc_dlc2len(RCANFD_RFPTR_RFDLC(dlc));
> - if (id & RCANFD_RFID_RFRTR)
> + if (id & RCANFD_RFID_RFRTR) {
> cf->can_id |= CAN_RTR_FLAG;
> - else
> - rcar_canfd_get_data(priv, cf, RCANFD_C_RFDF(ridx, 0));
> + } else {
> + if (gpriv->chip_id == RENESAS_R8A779A0)
> + rcar_canfd_get_data(priv, cf,
> + RCANFD_F_RFDF(ridx, 0));
> + else
> + rcar_canfd_get_data(priv, cf,
> + RCANFD_C_RFDF(ridx, 0));
> + }
> }
>
> /* Write 0xff to RFPC to increment the CPU-side
> @@ -1563,6 +1631,7 @@ static int rcar_canfd_rx_poll(struct napi_struct *napi, int quota)
> {
> struct rcar_canfd_channel *priv =
> container_of(napi, struct rcar_canfd_channel, napi);
> + struct rcar_canfd_global *gpriv = priv->gpriv;
> int num_pkts;
> u32 sts;
> u32 ch = priv->channel;
> @@ -1762,21 +1831,25 @@ static int rcar_canfd_probe(struct platform_device *pdev)
> int g_err_irq, g_recc_irq;
> bool fdmode = true; /* CAN FD only mode - default */
> enum rcanfd_chip_id chip_id;
> + int max_channels;
> + char name[9];
> + int i;
>
> chip_id = (uintptr_t)of_device_get_match_data(&pdev->dev);
> + max_channels = chip_id == RENESAS_R8A779A0 ? 8 : 2;
>
> if (of_property_read_bool(pdev->dev.of_node, "renesas,no-can-fd"))
> fdmode = false; /* Classical CAN only mode */
>
> - of_child = of_get_child_by_name(pdev->dev.of_node, "channel0");
> - if (of_child && of_device_is_available(of_child))
> - channels_mask |= BIT(0); /* Channel 0 */
> -
> - of_child = of_get_child_by_name(pdev->dev.of_node, "channel1");
> - if (of_child && of_device_is_available(of_child))
> - channels_mask |= BIT(1); /* Channel 1 */
> + strcpy(name, "channelX");
> + for (i = 0; i < max_channels; ++i) {
> + name[7] = '0' + i;
> + of_child = of_get_child_by_name(pdev->dev.of_node, name);
> + if (of_child && of_device_is_available(of_child))
> + channels_mask |= BIT(i);
> + }
>
> - if (chip_id == RENESAS_RCAR_GEN3) {
> + if (chip_id != RENESAS_RZG2L) {
> ch_irq = platform_get_irq_byname_optional(pdev, "ch_int");
> if (ch_irq < 0) {
> /* For backward compatibility get irq by index */
> @@ -1812,6 +1885,7 @@ static int rcar_canfd_probe(struct platform_device *pdev)
> gpriv->channels_mask = channels_mask;
> gpriv->fdmode = fdmode;
> gpriv->chip_id = chip_id;
> + gpriv->max_channels = max_channels;
>
> if (gpriv->chip_id == RENESAS_RZG2L) {
> gpriv->rstc1 = devm_reset_control_get_exclusive(&pdev->dev, "rstp_n");
> @@ -1853,7 +1927,7 @@ static int rcar_canfd_probe(struct platform_device *pdev)
> }
> fcan_freq = clk_get_rate(gpriv->can_clk);
>
> - if (gpriv->fcan == RCANFD_CANFDCLK && gpriv->chip_id == RENESAS_RCAR_GEN3)
> + if (gpriv->fcan == RCANFD_CANFDCLK && gpriv->chip_id != RENESAS_RZG2L)
> /* CANFD clock is further divided by (1/2) within the IP */
> fcan_freq /= 2;
>
> @@ -1865,7 +1939,7 @@ static int rcar_canfd_probe(struct platform_device *pdev)
> gpriv->base = addr;
>
> /* Request IRQ that's common for both channels */
> - if (gpriv->chip_id == RENESAS_RCAR_GEN3) {
> + if (gpriv->chip_id != RENESAS_RZG2L) {
> err = devm_request_irq(&pdev->dev, ch_irq,
> rcar_canfd_channel_interrupt, 0,
> "canfd.ch_int", gpriv);
> @@ -1931,7 +2005,7 @@ static int rcar_canfd_probe(struct platform_device *pdev)
> rcar_canfd_configure_controller(gpriv);
>
> /* Configure per channel attributes */
> - for_each_set_bit(ch, &gpriv->channels_mask, RCANFD_NUM_CHANNELS) {
> + for_each_set_bit(ch, &gpriv->channels_mask, max_channels) {
> /* Configure Channel's Rx fifo */
> rcar_canfd_configure_rx(gpriv, ch);
>
> @@ -1957,7 +2031,7 @@ static int rcar_canfd_probe(struct platform_device *pdev)
> goto fail_mode;
> }
>
> - for_each_set_bit(ch, &gpriv->channels_mask, RCANFD_NUM_CHANNELS) {
> + for_each_set_bit(ch, &gpriv->channels_mask, max_channels) {
> err = rcar_canfd_channel_probe(gpriv, ch, fcan_freq);
> if (err)
> goto fail_channel;
> @@ -1969,7 +2043,7 @@ static int rcar_canfd_probe(struct platform_device *pdev)
> return 0;
>
> fail_channel:
> - for_each_set_bit(ch, &gpriv->channels_mask, RCANFD_NUM_CHANNELS)
> + for_each_set_bit(ch, &gpriv->channels_mask, max_channels)
> rcar_canfd_channel_remove(gpriv, ch);
> fail_mode:
> rcar_canfd_disable_global_interrupts(gpriv);
> @@ -1990,7 +2064,7 @@ static int rcar_canfd_remove(struct platform_device *pdev)
> rcar_canfd_reset_controller(gpriv);
> rcar_canfd_disable_global_interrupts(gpriv);
>
> - for_each_set_bit(ch, &gpriv->channels_mask, RCANFD_NUM_CHANNELS) {
> + for_each_set_bit(ch, &gpriv->channels_mask, gpriv->max_channels) {
> rcar_canfd_disable_channel_interrupts(gpriv->ch[ch]);
> rcar_canfd_channel_remove(gpriv, ch);
> }
> @@ -2020,6 +2094,7 @@ static SIMPLE_DEV_PM_OPS(rcar_canfd_pm_ops, rcar_canfd_suspend,
> static const __maybe_unused struct of_device_id rcar_canfd_of_table[] = {
> { .compatible = "renesas,rcar-gen3-canfd", .data = (void *)RENESAS_RCAR_GEN3 },
> { .compatible = "renesas,rzg2l-canfd", .data = (void *)RENESAS_RZG2L },
> + { .compatible = "renesas,r8a779a0-canfd", .data = (void *)RENESAS_R8A779A0 },
> { }
> };
Yours sincerely,
Vincent Mailhol
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