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Date: Mon, 14 Feb 2022 16:10:10 +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 v3 1/4] can: rcar_canfd: Add support for r8a779a0 SoC
On Thu. 10 Feb 2022 at 02:06, Ulrich Hecht <uli+renesas@...nd.eu> 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 | 219 ++++++++++++++++++++----------
> 1 file changed, 146 insertions(+), 73 deletions(-)
>
> diff --git a/drivers/net/can/rcar/rcar_canfd.c b/drivers/net/can/rcar/rcar_canfd.c
> index b7dc1c32875f..3ad3a6f6a1dd 100644
> --- a/drivers/net/can/rcar/rcar_canfd.c
> +++ b/drivers/net/can/rcar/rcar_canfd.c
> @@ -44,6 +44,7 @@
> enum rcanfd_chip_id {
> RENESAS_RCAR_GEN3 = 0,
> RENESAS_RZG2L,
> + RENESAS_R8A779A0,
> };
>
> /* Global register bits */
> @@ -79,6 +80,7 @@ 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 +88,24 @@ enum rcanfd_chip_id {
> #define RCANFD_GERFL_MES BIT(1)
> #define RCANFD_GERFL_DEF BIT(0)
>
> -#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(x) ((x) & (reg_v3u(gpriv, RCANFD_GERFL_EEF0_7, \
> + RCANFD_GERFL_EEF0 | RCANFD_GERFL_EEF1) | \
> + RCANFD_GERFL_MES | ((gpriv)->fdmode ? \
> + RCANFD_GERFL_CMPOF : 0)))
Instead of packing everything on the right, I suggest putting in a bit more air.
Something like that:
#define RCANFD_GERFL_ERR(x) \
((x) & (reg_v3u(gpriv, RCANFD_GERFL_EEF0_7, \
RCANFD_GERFL_EEF0 | RCANFD_GERFL_EEF1) | \
RCANFD_GERFL_MES | \
((gpriv)->fdmode ? RCANFD_GERFL_CMPOF : 0)))
Same comment applies to other macros.
> /* 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) & reg_v3u(gpriv, 0x1ff, 0xff)) << \
> + (reg_v3u(gpriv, 16, 24) - \
> + (n) * reg_v3u(gpriv, 16, 8)))
> +#define RCANFD_GAFLCFG_GETRNC(n, x) (((x) >> (reg_v3u(gpriv, 16, 24) - \
> + (n) * reg_v3u(gpriv, 16, 8))) & \
> + reg_v3u(gpriv, 0x1ff, 0xff))
>
> /* RSCFDnCFDGAFLECTR / RSCFDnGAFLECTR */
> #define RCANFD_GAFLECTR_AFLDAE BIT(8)
> -#define RCANFD_GAFLECTR_AFLPN(x) ((x) & 0x1f)
> +#define RCANFD_GAFLECTR_AFLPN(x) ((x) & reg_v3u(gpriv, 0x7f, 0x1f))
>
> /* RSCFDnCFDGAFLIDj / RSCFDnGAFLIDj */
> #define RCANFD_GAFLID_GAFLLB BIT(29)
> @@ -116,9 +122,12 @@ 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) & reg_v3u(gpriv, 0x7f, 0x1f)) << \
> + reg_v3u(gpriv, 25, 24))
> +#define RCANFD_NCFG_NTSEG1(x) (((x) & reg_v3u(gpriv, 0xff, 0x7f)) << \
> + reg_v3u(gpriv, 17, 16))
> +#define RCANFD_NCFG_NSJW(x) (((x) & reg_v3u(gpriv, 0x7f, 0x1f)) << \
> + reg_v3u(gpriv, 10, 11))
> #define RCANFD_NCFG_NBRP(x) (((x) & 0x3ff) << 0)
>
> /* RSCFDnCFDCmCTR / RSCFDnCmCTR */
> @@ -180,11 +189,15 @@ 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) & reg_v3u(gpriv, 0x0f, 0x7)) << \
> + reg_v3u(gpriv, 16, 20))
> +#define RCANFD_DCFG_DTSEG1(x) (((x) & reg_v3u(gpriv, 0x1f, 0xf)) << \
> + reg_v3u(gpriv, 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 +232,10 @@ 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) << reg_v3u(gpriv, 16, 20))
> +#define RCANFD_CFCC_CFM(x) (((x) & 0x3) << reg_v3u(gpriv, 8, 16))
> #define RCANFD_CFCC_CFIM BIT(12)
> -#define RCANFD_CFCC_CFDC(x) (((x) & 0x7) << 8)
> +#define RCANFD_CFCC_CFDC(x) (((x) & 0x7) << reg_v3u(gpriv, 21, 8))
> #define RCANFD_CFCC_CFPLS(x) (((x) & 0x7) << 4)
> #define RCANFD_CFCC_CFTXIE BIT(2)
> #define RCANFD_CFCC_CFE BIT(0)
> @@ -282,33 +295,32 @@ 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) (reg_v3u(gpriv, 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) (reg_v3u(gpriv, 0x0120, 0x0118) + \
> + (0x0c * (ch)) + (0x04 * (idx)))
> /* RSCFDnCFDCFSTSx / RSCFDnCFSTSx */
> -#define RCANFD_CFSTS(ch, idx) (0x0178 + (0x0c * (ch)) + \
> - (0x04 * (idx)))
> +#define RCANFD_CFSTS(ch, idx) (reg_v3u(gpriv, 0x01e0, 0x0178) + \
> + (0x0c * (ch)) + (0x04 * (idx)))
> /* RSCFDnCFDCFPCTRx / RSCFDnCFPCTRx */
> -#define RCANFD_CFPCTR(ch, idx) (0x01d8 + (0x0c * (ch)) + \
> - (0x04 * (idx)))
> +#define RCANFD_CFPCTR(ch, idx) (reg_v3u(gpriv, 0x0240, 0x01d8) + \
> + (0x0c * (ch)) + (0x04 * (idx)))
>
> /* RSCFDnCFDFESTS / RSCFDnFESTS */
> #define RCANFD_FESTS (0x0238)
> @@ -415,6 +427,12 @@ 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 +452,7 @@ 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 reg_v3u(gpriv, 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 +462,7 @@ enum rcanfd_chip_id {
> (0x80 * (x)) + (0x04 * (df)))
>
> /* RSCFDnCFDCFXXk -> RCANFD_F_CFXX(ch, k) */
> -#define RCANFD_F_CFOFFSET (0x3400)
> +#define RCANFD_F_CFOFFSET reg_v3u(gpriv, 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 +488,7 @@ 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)
> @@ -521,6 +539,7 @@ 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 */
> @@ -563,6 +582,17 @@ static const struct can_bittiming_const rcar_canfd_bittiming_const = {
> };
>
> /* Helper functions */
> +static inline bool is_v3u(struct rcar_canfd_global *gpriv)
> +{
> + return gpriv->chip_id == RENESAS_R8A779A0;
> +}
> +
> +static inline u32 reg_v3u(struct rcar_canfd_global *gpriv,
> + u32 v3u, u32 not_v3u)
> +{
> + return is_v3u(gpriv) ? v3u : not_v3u;
> +}
Nitpick but I would personally prefer if is_v3u() and reg_v3u()
were declared before the macros in which they are being used.
> static inline void rcar_canfd_update(u32 mask, u32 val, u32 __iomem *reg)
> {
> u32 data = readl(reg);
> @@ -628,6 +658,25 @@ 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 (is_v3u(gpriv)) {
> + 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;
> @@ -660,15 +709,10 @@ 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);
>
> @@ -709,7 +753,7 @@ 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),
> @@ -729,7 +773,7 @@ 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);
> }
>
> @@ -740,12 +784,16 @@ 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 (is_v3u(gpriv)) {
> + 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);
> @@ -754,8 +802,8 @@ 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,
> @@ -1038,6 +1086,7 @@ 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;
> @@ -1082,7 +1131,7 @@ static void rcar_canfd_handle_global_err(struct rcar_canfd_global *gpriv, u32 ch
>
> /* Handle global error interrupts */
> gerfl = rcar_canfd_read(priv->base, RCANFD_GERFL);
> - if (unlikely(RCANFD_GERFL_ERR(gpriv, gerfl)))
> + if (unlikely(RCANFD_GERFL_ERR(gerfl)))
> rcar_canfd_global_error(ndev);
> }
>
> @@ -1091,7 +1140,7 @@ 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;
> @@ -1121,7 +1170,7 @@ 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;
> @@ -1135,7 +1184,7 @@ 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);
> }
> @@ -1191,7 +1240,7 @@ 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;
> @@ -1223,7 +1272,7 @@ 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;
> @@ -1235,7 +1284,7 @@ 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);
> }
> @@ -1246,6 +1295,7 @@ 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;
> @@ -1281,8 +1331,17 @@ 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 (is_v3u(gpriv)) {
> + 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));
> + }
Nitpick: can't you use one of your reg_v3u() functions here?
| cfg = reg_v3u(gpriv, ..., ...)?
> rcar_canfd_write(priv->base, RCANFD_CCFG(ch), cfg);
> netdev_dbg(priv->ndev,
> @@ -1294,6 +1353,7 @@ 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;
> @@ -1365,6 +1425,7 @@ 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;
> @@ -1408,6 +1469,7 @@ 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;
> @@ -1428,7 +1490,7 @@ 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) || is_v3u(gpriv)) {
> rcar_canfd_write(priv->base,
> RCANFD_F_CFID(ch, RCANFD_CFFIFO_IDX), id);
> rcar_canfd_write(priv->base,
> @@ -1480,18 +1542,21 @@ 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) || is_v3u(gpriv)) {
> 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)
> +
> + if ((priv->can.ctrlmode & CAN_CTRLMODE_FD) &&
> + sts & RCANFD_RFFDSTS_RFFDF)
> skb = alloc_canfd_skb(priv->ndev, &cf);
> else
> skb = alloc_can_skb(priv->ndev,
> @@ -1535,6 +1600,8 @@ static void rcar_canfd_rx_pkt(struct rcar_canfd_channel *priv)
> cf->len = can_cc_dlc2len(RCANFD_RFPTR_RFDLC(dlc));
> if (id & RCANFD_RFID_RFRTR)
> cf->can_id |= CAN_RTR_FLAG;
> + else if (is_v3u(gpriv))
> + rcar_canfd_get_data(priv, cf, RCANFD_F_RFDF(ridx, 0));
> else
> rcar_canfd_get_data(priv, cf, RCANFD_C_RFDF(ridx, 0));
> }
> @@ -1556,6 +1623,7 @@ 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;
> @@ -1756,21 +1824,24 @@ 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] = "channelX";
> + int i;
>
> chip_id = (uintptr_t)of_device_get_match_data(&pdev->dev);
> + max_channels = chip_id == RENESAS_R8A779A0 ? 8 : 2;
Another nitpick: can we move this line up:
| assigment gpriv->chip_id = chip_id;
and use instead is_v3u() here?
> 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 */
> + 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 */
> @@ -1806,6 +1877,7 @@ 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");
> @@ -1847,7 +1919,7 @@ 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;
>
> @@ -1859,7 +1931,7 @@ 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);
> @@ -1925,7 +1997,7 @@ 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);
>
> @@ -1951,7 +2023,7 @@ 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;
> @@ -1963,7 +2035,7 @@ 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);
> @@ -1984,7 +2056,7 @@ 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);
> }
> @@ -2014,6 +2086,7 @@ 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 },
> { }
> };
>
> --
> 2.20.1
>
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