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Message-ID: <0ef0473f-c0dc-9063-68b1-a7a956f638d0@csgroup.eu>
Date: Fri, 17 Feb 2023 16:28:15 +0000
From: Christophe Leroy <christophe.leroy@...roup.eu>
To: Herve Codina <herve.codina@...tlin.com>,
Li Yang <leoyang.li@....com>, Rob Herring <robh+dt@...nel.org>,
Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
Liam Girdwood <lgirdwood@...il.com>,
Mark Brown <broonie@...nel.org>,
Michael Ellerman <mpe@...erman.id.au>,
Nicholas Piggin <npiggin@...il.com>,
Qiang Zhao <qiang.zhao@....com>,
Jaroslav Kysela <perex@...ex.cz>,
Takashi Iwai <tiwai@...e.com>,
Shengjiu Wang <shengjiu.wang@...il.com>,
Xiubo Li <Xiubo.Lee@...il.com>,
Fabio Estevam <festevam@...il.com>,
Nicolin Chen <nicoleotsuka@...il.com>
CC: "linuxppc-dev@...ts.ozlabs.org" <linuxppc-dev@...ts.ozlabs.org>,
"linux-arm-kernel@...ts.infradead.org"
<linux-arm-kernel@...ts.infradead.org>,
"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
"alsa-devel@...a-project.org" <alsa-devel@...a-project.org>,
Thomas Petazzoni <thomas.petazzoni@...tlin.com>
Subject: Re: [PATCH v6 06/10] soc: fsl: cpm1: Add support for QMC
Le 17/02/2023 à 15:56, Herve Codina a écrit :
> The QMC (QUICC Multichannel Controller) emulates up to 64
> channels within one serial controller using the same TDM
> physical interface routed from the TSA.
>
> It is available in some PowerQUICC SoC such as the
> MPC885 or MPC866.
>
> It is also available on some Quicc Engine SoCs.
> This current version support CPM1 SoCs only and some
> enhancement are needed to support Quicc Engine SoCs.
>
> Signed-off-by: Herve Codina <herve.codina@...tlin.com>
> Acked-by: Li Yang <leoyang.li@....com>
Reviewed-by: Christophe Leroy <christophe.leroy@...roup.eu>
> ---
> drivers/soc/fsl/qe/Kconfig | 12 +
> drivers/soc/fsl/qe/Makefile | 1 +
> drivers/soc/fsl/qe/qmc.c | 1533 +++++++++++++++++++++++++++++++++++
> include/soc/fsl/qe/qmc.h | 71 ++
> 4 files changed, 1617 insertions(+)
> create mode 100644 drivers/soc/fsl/qe/qmc.c
> create mode 100644 include/soc/fsl/qe/qmc.h
>
> diff --git a/drivers/soc/fsl/qe/Kconfig b/drivers/soc/fsl/qe/Kconfig
> index b0088495c323..f90cfdf0c763 100644
> --- a/drivers/soc/fsl/qe/Kconfig
> +++ b/drivers/soc/fsl/qe/Kconfig
> @@ -44,6 +44,18 @@ config CPM_TSA
> This option enables support for this
> controller
>
> +config CPM_QMC
> + tristate "CPM QMC support"
> + depends on OF && HAS_IOMEM
> + depends on CPM1 || (SOC_FSL && COMPILE_TEST)
> + depends on CPM_TSA
> + help
> + Freescale CPM QUICC Multichannel Controller
> + (QMC)
> +
> + This option enables support for this
> + controller
> +
> config QE_TDM
> bool
> default y if FSL_UCC_HDLC
> diff --git a/drivers/soc/fsl/qe/Makefile b/drivers/soc/fsl/qe/Makefile
> index 45c961acc81b..ec8506e13113 100644
> --- a/drivers/soc/fsl/qe/Makefile
> +++ b/drivers/soc/fsl/qe/Makefile
> @@ -5,6 +5,7 @@
> obj-$(CONFIG_QUICC_ENGINE)+= qe.o qe_common.o qe_ic.o qe_io.o
> obj-$(CONFIG_CPM) += qe_common.o
> obj-$(CONFIG_CPM_TSA) += tsa.o
> +obj-$(CONFIG_CPM_QMC) += qmc.o
> obj-$(CONFIG_UCC) += ucc.o
> obj-$(CONFIG_UCC_SLOW) += ucc_slow.o
> obj-$(CONFIG_UCC_FAST) += ucc_fast.o
> diff --git a/drivers/soc/fsl/qe/qmc.c b/drivers/soc/fsl/qe/qmc.c
> new file mode 100644
> index 000000000000..cfa7207353e0
> --- /dev/null
> +++ b/drivers/soc/fsl/qe/qmc.c
> @@ -0,0 +1,1533 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * QMC driver
> + *
> + * Copyright 2022 CS GROUP France
> + *
> + * Author: Herve Codina <herve.codina@...tlin.com>
> + */
> +
> +#include <soc/fsl/qe/qmc.h>
> +#include <linux/dma-mapping.h>
> +#include <linux/hdlc.h>
> +#include <linux/interrupt.h>
> +#include <linux/io.h>
> +#include <linux/module.h>
> +#include <linux/of.h>
> +#include <linux/of_platform.h>
> +#include <linux/platform_device.h>
> +#include <linux/slab.h>
> +#include <soc/fsl/cpm.h>
> +#include <sysdev/fsl_soc.h>
> +#include "tsa.h"
> +
> +/* SCC general mode register high (32 bits) */
> +#define SCC_GSMRL 0x00
> +#define SCC_GSMRL_ENR (1 << 5)
> +#define SCC_GSMRL_ENT (1 << 4)
> +#define SCC_GSMRL_MODE_QMC (0x0A << 0)
> +
> +/* SCC general mode register low (32 bits) */
> +#define SCC_GSMRH 0x04
> +#define SCC_GSMRH_CTSS (1 << 7)
> +#define SCC_GSMRH_CDS (1 << 8)
> +#define SCC_GSMRH_CTSP (1 << 9)
> +#define SCC_GSMRH_CDP (1 << 10)
> +
> +/* SCC event register (16 bits) */
> +#define SCC_SCCE 0x10
> +#define SCC_SCCE_IQOV (1 << 3)
> +#define SCC_SCCE_GINT (1 << 2)
> +#define SCC_SCCE_GUN (1 << 1)
> +#define SCC_SCCE_GOV (1 << 0)
> +
> +/* SCC mask register (16 bits) */
> +#define SCC_SCCM 0x14
> +/* Multichannel base pointer (32 bits) */
> +#define QMC_GBL_MCBASE 0x00
> +/* Multichannel controller state (16 bits) */
> +#define QMC_GBL_QMCSTATE 0x04
> +/* Maximum receive buffer length (16 bits) */
> +#define QMC_GBL_MRBLR 0x06
> +/* Tx time-slot assignment table pointer (16 bits) */
> +#define QMC_GBL_TX_S_PTR 0x08
> +/* Rx pointer (16 bits) */
> +#define QMC_GBL_RXPTR 0x0A
> +/* Global receive frame threshold (16 bits) */
> +#define QMC_GBL_GRFTHR 0x0C
> +/* Global receive frame count (16 bits) */
> +#define QMC_GBL_GRFCNT 0x0E
> +/* Multichannel interrupt base address (32 bits) */
> +#define QMC_GBL_INTBASE 0x10
> +/* Multichannel interrupt pointer (32 bits) */
> +#define QMC_GBL_INTPTR 0x14
> +/* Rx time-slot assignment table pointer (16 bits) */
> +#define QMC_GBL_RX_S_PTR 0x18
> +/* Tx pointer (16 bits) */
> +#define QMC_GBL_TXPTR 0x1A
> +/* CRC constant (32 bits) */
> +#define QMC_GBL_C_MASK32 0x1C
> +/* Time slot assignment table Rx (32 x 16 bits) */
> +#define QMC_GBL_TSATRX 0x20
> +/* Time slot assignment table Tx (32 x 16 bits) */
> +#define QMC_GBL_TSATTX 0x60
> +/* CRC constant (16 bits) */
> +#define QMC_GBL_C_MASK16 0xA0
> +
> +/* TSA entry (16bit entry in TSATRX and TSATTX) */
> +#define QMC_TSA_VALID (1 << 15)
> +#define QMC_TSA_WRAP (1 << 14)
> +#define QMC_TSA_MASK (0x303F)
> +#define QMC_TSA_CHANNEL(x) ((x) << 6)
> +
> +/* Tx buffer descriptor base address (16 bits, offset from MCBASE) */
> +#define QMC_SPE_TBASE 0x00
> +
> +/* Channel mode register (16 bits) */
> +#define QMC_SPE_CHAMR 0x02
> +#define QMC_SPE_CHAMR_MODE_HDLC (1 << 15)
> +#define QMC_SPE_CHAMR_MODE_TRANSP ((0 << 15) | (1 << 13))
> +#define QMC_SPE_CHAMR_ENT (1 << 12)
> +#define QMC_SPE_CHAMR_POL (1 << 8)
> +#define QMC_SPE_CHAMR_HDLC_IDLM (1 << 13)
> +#define QMC_SPE_CHAMR_HDLC_CRC (1 << 7)
> +#define QMC_SPE_CHAMR_HDLC_NOF (0x0f << 0)
> +#define QMC_SPE_CHAMR_TRANSP_RD (1 << 14)
> +#define QMC_SPE_CHAMR_TRANSP_SYNC (1 << 10)
> +
> +/* Tx internal state (32 bits) */
> +#define QMC_SPE_TSTATE 0x04
> +/* Tx buffer descriptor pointer (16 bits) */
> +#define QMC_SPE_TBPTR 0x0C
> +/* Zero-insertion state (32 bits) */
> +#define QMC_SPE_ZISTATE 0x14
> +/* Channel’s interrupt mask flags (16 bits) */
> +#define QMC_SPE_INTMSK 0x1C
> +/* Rx buffer descriptor base address (16 bits, offset from MCBASE) */
> +#define QMC_SPE_RBASE 0x20
> +/* HDLC: Maximum frame length register (16 bits) */
> +#define QMC_SPE_MFLR 0x22
> +/* TRANSPARENT: Transparent maximum receive length (16 bits) */
> +#define QMC_SPE_TMRBLR 0x22
> +/* Rx internal state (32 bits) */
> +#define QMC_SPE_RSTATE 0x24
> +/* Rx buffer descriptor pointer (16 bits) */
> +#define QMC_SPE_RBPTR 0x2C
> +/* Packs 4 bytes to 1 long word before writing to buffer (32 bits) */
> +#define QMC_SPE_RPACK 0x30
> +/* Zero deletion state (32 bits) */
> +#define QMC_SPE_ZDSTATE 0x34
> +
> +/* Transparent synchronization (16 bits) */
> +#define QMC_SPE_TRNSYNC 0x3C
> +#define QMC_SPE_TRNSYNC_RX(x) ((x) << 8)
> +#define QMC_SPE_TRNSYNC_TX(x) ((x) << 0)
> +
> +/* Interrupt related registers bits */
> +#define QMC_INT_V (1 << 15)
> +#define QMC_INT_W (1 << 14)
> +#define QMC_INT_NID (1 << 13)
> +#define QMC_INT_IDL (1 << 12)
> +#define QMC_INT_GET_CHANNEL(x) (((x) & 0x0FC0) >> 6)
> +#define QMC_INT_MRF (1 << 5)
> +#define QMC_INT_UN (1 << 4)
> +#define QMC_INT_RXF (1 << 3)
> +#define QMC_INT_BSY (1 << 2)
> +#define QMC_INT_TXB (1 << 1)
> +#define QMC_INT_RXB (1 << 0)
> +
> +/* BD related registers bits */
> +#define QMC_BD_RX_E (1 << 15)
> +#define QMC_BD_RX_W (1 << 13)
> +#define QMC_BD_RX_I (1 << 12)
> +#define QMC_BD_RX_L (1 << 11)
> +#define QMC_BD_RX_F (1 << 10)
> +#define QMC_BD_RX_CM (1 << 9)
> +#define QMC_BD_RX_UB (1 << 7)
> +#define QMC_BD_RX_LG (1 << 5)
> +#define QMC_BD_RX_NO (1 << 4)
> +#define QMC_BD_RX_AB (1 << 3)
> +#define QMC_BD_RX_CR (1 << 2)
> +
> +#define QMC_BD_TX_R (1 << 15)
> +#define QMC_BD_TX_W (1 << 13)
> +#define QMC_BD_TX_I (1 << 12)
> +#define QMC_BD_TX_L (1 << 11)
> +#define QMC_BD_TX_TC (1 << 10)
> +#define QMC_BD_TX_CM (1 << 9)
> +#define QMC_BD_TX_UB (1 << 7)
> +#define QMC_BD_TX_PAD (0x0f << 0)
> +
> +/* Numbers of BDs and interrupt items */
> +#define QMC_NB_TXBDS 8
> +#define QMC_NB_RXBDS 8
> +#define QMC_NB_INTS 128
> +
> +struct qmc_xfer_desc {
> + union {
> + void (*tx_complete)(void *context);
> + void (*rx_complete)(void *context, size_t length);
> + };
> + void *context;
> +};
> +
> +struct qmc_chan {
> + struct list_head list;
> + unsigned int id;
> + struct qmc *qmc;
> + void *__iomem s_param;
> + enum qmc_mode mode;
> + u64 tx_ts_mask;
> + u64 rx_ts_mask;
> + bool is_reverse_data;
> +
> + spinlock_t tx_lock;
> + cbd_t __iomem *txbds;
> + cbd_t __iomem *txbd_free;
> + cbd_t __iomem *txbd_done;
> + struct qmc_xfer_desc tx_desc[QMC_NB_TXBDS];
> + u64 nb_tx_underrun;
> + bool is_tx_stopped;
> +
> + spinlock_t rx_lock;
> + cbd_t __iomem *rxbds;
> + cbd_t __iomem *rxbd_free;
> + cbd_t __iomem *rxbd_done;
> + struct qmc_xfer_desc rx_desc[QMC_NB_RXBDS];
> + u64 nb_rx_busy;
> + int rx_pending;
> + bool is_rx_halted;
> + bool is_rx_stopped;
> +};
> +
> +struct qmc {
> + struct device *dev;
> + struct tsa_serial *tsa_serial;
> + void *__iomem scc_regs;
> + void *__iomem scc_pram;
> + void *__iomem dpram;
> + u16 scc_pram_offset;
> + cbd_t __iomem *bd_table;
> + dma_addr_t bd_dma_addr;
> + size_t bd_size;
> + u16 __iomem *int_table;
> + u16 __iomem *int_curr;
> + dma_addr_t int_dma_addr;
> + size_t int_size;
> + struct list_head chan_head;
> + struct qmc_chan *chans[64];
> +};
> +
> +static inline void qmc_write16(void *__iomem addr, u16 val)
> +{
> + iowrite16be(val, addr);
> +}
> +
> +static inline u16 qmc_read16(void *__iomem addr)
> +{
> + return ioread16be(addr);
> +}
> +
> +static inline void qmc_setbits16(void *__iomem addr, u16 set)
> +{
> + qmc_write16(addr, qmc_read16(addr) | set);
> +}
> +
> +static inline void qmc_clrbits16(void *__iomem addr, u16 clr)
> +{
> + qmc_write16(addr, qmc_read16(addr) & ~clr);
> +}
> +
> +static inline void qmc_write32(void *__iomem addr, u32 val)
> +{
> + iowrite32be(val, addr);
> +}
> +
> +static inline u32 qmc_read32(void *__iomem addr)
> +{
> + return ioread32be(addr);
> +}
> +
> +static inline void qmc_setbits32(void *__iomem addr, u32 set)
> +{
> + qmc_write32(addr, qmc_read32(addr) | set);
> +}
> +
> +
> +int qmc_chan_get_info(struct qmc_chan *chan, struct qmc_chan_info *info)
> +{
> + struct tsa_serial_info tsa_info;
> + int ret;
> +
> + /* Retrieve info from the TSA related serial */
> + ret = tsa_serial_get_info(chan->qmc->tsa_serial, &tsa_info);
> + if (ret)
> + return ret;
> +
> + info->mode = chan->mode;
> + info->rx_fs_rate = tsa_info.rx_fs_rate;
> + info->rx_bit_rate = tsa_info.rx_bit_rate;
> + info->nb_tx_ts = hweight64(chan->tx_ts_mask);
> + info->tx_fs_rate = tsa_info.tx_fs_rate;
> + info->tx_bit_rate = tsa_info.tx_bit_rate;
> + info->nb_rx_ts = hweight64(chan->rx_ts_mask);
> +
> + return 0;
> +}
> +EXPORT_SYMBOL(qmc_chan_get_info);
> +
> +int qmc_chan_set_param(struct qmc_chan *chan, const struct qmc_chan_param *param)
> +{
> + if (param->mode != chan->mode)
> + return -EINVAL;
> +
> + switch (param->mode) {
> + case QMC_HDLC:
> + if ((param->hdlc.max_rx_buf_size % 4) ||
> + (param->hdlc.max_rx_buf_size < 8))
> + return -EINVAL;
> +
> + qmc_write16(chan->qmc->scc_pram + QMC_GBL_MRBLR,
> + param->hdlc.max_rx_buf_size - 8);
> + qmc_write16(chan->s_param + QMC_SPE_MFLR,
> + param->hdlc.max_rx_frame_size);
> + if (param->hdlc.is_crc32) {
> + qmc_setbits16(chan->s_param + QMC_SPE_CHAMR,
> + QMC_SPE_CHAMR_HDLC_CRC);
> + } else {
> + qmc_clrbits16(chan->s_param + QMC_SPE_CHAMR,
> + QMC_SPE_CHAMR_HDLC_CRC);
> + }
> + break;
> +
> + case QMC_TRANSPARENT:
> + qmc_write16(chan->s_param + QMC_SPE_TMRBLR,
> + param->transp.max_rx_buf_size);
> + break;
> +
> + default:
> + return -EINVAL;
> + }
> +
> + return 0;
> +}
> +EXPORT_SYMBOL(qmc_chan_set_param);
> +
> +int qmc_chan_write_submit(struct qmc_chan *chan, dma_addr_t addr, size_t length,
> + void (*complete)(void *context), void *context)
> +{
> + struct qmc_xfer_desc *xfer_desc;
> + unsigned long flags;
> + cbd_t *__iomem bd;
> + u16 ctrl;
> + int ret;
> +
> + /*
> + * R bit UB bit
> + * 0 0 : The BD is free
> + * 1 1 : The BD is in used, waiting for transfer
> + * 0 1 : The BD is in used, waiting for completion
> + * 1 0 : Should not append
> + */
> +
> + spin_lock_irqsave(&chan->tx_lock, flags);
> + bd = chan->txbd_free;
> +
> + ctrl = qmc_read16(&bd->cbd_sc);
> + if (ctrl & (QMC_BD_TX_R | QMC_BD_TX_UB)) {
> + /* We are full ... */
> + ret = -EBUSY;
> + goto end;
> + }
> +
> + qmc_write16(&bd->cbd_datlen, length);
> + qmc_write32(&bd->cbd_bufaddr, addr);
> +
> + xfer_desc = &chan->tx_desc[bd - chan->txbds];
> + xfer_desc->tx_complete = complete;
> + xfer_desc->context = context;
> +
> + /* Activate the descriptor */
> + ctrl |= (QMC_BD_TX_R | QMC_BD_TX_UB);
> + wmb(); /* Be sure to flush the descriptor before control update */
> + qmc_write16(&bd->cbd_sc, ctrl);
> +
> + if (!chan->is_tx_stopped)
> + qmc_setbits16(chan->s_param + QMC_SPE_CHAMR, QMC_SPE_CHAMR_POL);
> +
> + if (ctrl & QMC_BD_TX_W)
> + chan->txbd_free = chan->txbds;
> + else
> + chan->txbd_free++;
> +
> + ret = 0;
> +
> +end:
> + spin_unlock_irqrestore(&chan->tx_lock, flags);
> + return ret;
> +}
> +EXPORT_SYMBOL(qmc_chan_write_submit);
> +
> +static void qmc_chan_write_done(struct qmc_chan *chan)
> +{
> + struct qmc_xfer_desc *xfer_desc;
> + void (*complete)(void *context);
> + unsigned long flags;
> + void *context;
> + cbd_t *__iomem bd;
> + u16 ctrl;
> +
> + /*
> + * R bit UB bit
> + * 0 0 : The BD is free
> + * 1 1 : The BD is in used, waiting for transfer
> + * 0 1 : The BD is in used, waiting for completion
> + * 1 0 : Should not append
> + */
> +
> + spin_lock_irqsave(&chan->tx_lock, flags);
> + bd = chan->txbd_done;
> +
> + ctrl = qmc_read16(&bd->cbd_sc);
> + while (!(ctrl & QMC_BD_TX_R)) {
> + if (!(ctrl & QMC_BD_TX_UB))
> + goto end;
> +
> + xfer_desc = &chan->tx_desc[bd - chan->txbds];
> + complete = xfer_desc->tx_complete;
> + context = xfer_desc->context;
> + xfer_desc->tx_complete = NULL;
> + xfer_desc->context = NULL;
> +
> + qmc_write16(&bd->cbd_sc, ctrl & ~QMC_BD_TX_UB);
> +
> + if (ctrl & QMC_BD_TX_W)
> + chan->txbd_done = chan->txbds;
> + else
> + chan->txbd_done++;
> +
> + if (complete) {
> + spin_unlock_irqrestore(&chan->tx_lock, flags);
> + complete(context);
> + spin_lock_irqsave(&chan->tx_lock, flags);
> + }
> +
> + bd = chan->txbd_done;
> + ctrl = qmc_read16(&bd->cbd_sc);
> + }
> +
> +end:
> + spin_unlock_irqrestore(&chan->tx_lock, flags);
> +}
> +
> +int qmc_chan_read_submit(struct qmc_chan *chan, dma_addr_t addr, size_t length,
> + void (*complete)(void *context, size_t length), void *context)
> +{
> + struct qmc_xfer_desc *xfer_desc;
> + unsigned long flags;
> + cbd_t *__iomem bd;
> + u16 ctrl;
> + int ret;
> +
> + /*
> + * E bit UB bit
> + * 0 0 : The BD is free
> + * 1 1 : The BD is in used, waiting for transfer
> + * 0 1 : The BD is in used, waiting for completion
> + * 1 0 : Should not append
> + */
> +
> + spin_lock_irqsave(&chan->rx_lock, flags);
> + bd = chan->rxbd_free;
> +
> + ctrl = qmc_read16(&bd->cbd_sc);
> + if (ctrl & (QMC_BD_RX_E | QMC_BD_RX_UB)) {
> + /* We are full ... */
> + ret = -EBUSY;
> + goto end;
> + }
> +
> + qmc_write16(&bd->cbd_datlen, 0); /* data length is updated by the QMC */
> + qmc_write32(&bd->cbd_bufaddr, addr);
> +
> + xfer_desc = &chan->rx_desc[bd - chan->rxbds];
> + xfer_desc->rx_complete = complete;
> + xfer_desc->context = context;
> +
> + /* Activate the descriptor */
> + ctrl |= (QMC_BD_RX_E | QMC_BD_RX_UB);
> + wmb(); /* Be sure to flush data before descriptor activation */
> + qmc_write16(&bd->cbd_sc, ctrl);
> +
> + /* Restart receiver if needed */
> + if (chan->is_rx_halted && !chan->is_rx_stopped) {
> + /* Restart receiver */
> + if (chan->mode == QMC_TRANSPARENT)
> + qmc_write32(chan->s_param + QMC_SPE_ZDSTATE, 0x18000080);
> + else
> + qmc_write32(chan->s_param + QMC_SPE_ZDSTATE, 0x00000080);
> + qmc_write32(chan->s_param + QMC_SPE_RSTATE, 0x31000000);
> + chan->is_rx_halted = false;
> + }
> + chan->rx_pending++;
> +
> + if (ctrl & QMC_BD_RX_W)
> + chan->rxbd_free = chan->rxbds;
> + else
> + chan->rxbd_free++;
> +
> + ret = 0;
> +end:
> + spin_unlock_irqrestore(&chan->rx_lock, flags);
> + return ret;
> +}
> +EXPORT_SYMBOL(qmc_chan_read_submit);
> +
> +static void qmc_chan_read_done(struct qmc_chan *chan)
> +{
> + void (*complete)(void *context, size_t size);
> + struct qmc_xfer_desc *xfer_desc;
> + unsigned long flags;
> + cbd_t *__iomem bd;
> + void *context;
> + u16 datalen;
> + u16 ctrl;
> +
> + /*
> + * E bit UB bit
> + * 0 0 : The BD is free
> + * 1 1 : The BD is in used, waiting for transfer
> + * 0 1 : The BD is in used, waiting for completion
> + * 1 0 : Should not append
> + */
> +
> + spin_lock_irqsave(&chan->rx_lock, flags);
> + bd = chan->rxbd_done;
> +
> + ctrl = qmc_read16(&bd->cbd_sc);
> + while (!(ctrl & QMC_BD_RX_E)) {
> + if (!(ctrl & QMC_BD_RX_UB))
> + goto end;
> +
> + xfer_desc = &chan->rx_desc[bd - chan->rxbds];
> + complete = xfer_desc->rx_complete;
> + context = xfer_desc->context;
> + xfer_desc->rx_complete = NULL;
> + xfer_desc->context = NULL;
> +
> + datalen = qmc_read16(&bd->cbd_datlen);
> + qmc_write16(&bd->cbd_sc, ctrl & ~QMC_BD_RX_UB);
> +
> + if (ctrl & QMC_BD_RX_W)
> + chan->rxbd_done = chan->rxbds;
> + else
> + chan->rxbd_done++;
> +
> + chan->rx_pending--;
> +
> + if (complete) {
> + spin_unlock_irqrestore(&chan->rx_lock, flags);
> + complete(context, datalen);
> + spin_lock_irqsave(&chan->rx_lock, flags);
> + }
> +
> + bd = chan->rxbd_done;
> + ctrl = qmc_read16(&bd->cbd_sc);
> + }
> +
> +end:
> + spin_unlock_irqrestore(&chan->rx_lock, flags);
> +}
> +
> +static int qmc_chan_command(struct qmc_chan *chan, u8 qmc_opcode)
> +{
> + return cpm_command(chan->id << 2, (qmc_opcode << 4) | 0x0E);
> +}
> +
> +static int qmc_chan_stop_rx(struct qmc_chan *chan)
> +{
> + unsigned long flags;
> + int ret;
> +
> + spin_lock_irqsave(&chan->rx_lock, flags);
> +
> + /* Send STOP RECEIVE command */
> + ret = qmc_chan_command(chan, 0x0);
> + if (ret) {
> + dev_err(chan->qmc->dev, "chan %u: Send STOP RECEIVE failed (%d)\n",
> + chan->id, ret);
> + goto end;
> + }
> +
> + chan->is_rx_stopped = true;
> +
> +end:
> + spin_unlock_irqrestore(&chan->rx_lock, flags);
> + return ret;
> +}
> +
> +static int qmc_chan_stop_tx(struct qmc_chan *chan)
> +{
> + unsigned long flags;
> + int ret;
> +
> + spin_lock_irqsave(&chan->tx_lock, flags);
> +
> + /* Send STOP TRANSMIT command */
> + ret = qmc_chan_command(chan, 0x1);
> + if (ret) {
> + dev_err(chan->qmc->dev, "chan %u: Send STOP TRANSMIT failed (%d)\n",
> + chan->id, ret);
> + goto end;
> + }
> +
> + chan->is_tx_stopped = true;
> +
> +end:
> + spin_unlock_irqrestore(&chan->tx_lock, flags);
> + return ret;
> +}
> +
> +int qmc_chan_stop(struct qmc_chan *chan, int direction)
> +{
> + int ret;
> +
> + if (direction & QMC_CHAN_READ) {
> + ret = qmc_chan_stop_rx(chan);
> + if (ret)
> + return ret;
> + }
> +
> + if (direction & QMC_CHAN_WRITE) {
> + ret = qmc_chan_stop_tx(chan);
> + if (ret)
> + return ret;
> + }
> +
> + return 0;
> +}
> +EXPORT_SYMBOL(qmc_chan_stop);
> +
> +static void qmc_chan_start_rx(struct qmc_chan *chan)
> +{
> + unsigned long flags;
> +
> + spin_lock_irqsave(&chan->rx_lock, flags);
> +
> + /* Restart the receiver */
> + if (chan->mode == QMC_TRANSPARENT)
> + qmc_write32(chan->s_param + QMC_SPE_ZDSTATE, 0x18000080);
> + else
> + qmc_write32(chan->s_param + QMC_SPE_ZDSTATE, 0x00000080);
> + qmc_write32(chan->s_param + QMC_SPE_RSTATE, 0x31000000);
> + chan->is_rx_halted = false;
> +
> + chan->is_rx_stopped = false;
> +
> + spin_unlock_irqrestore(&chan->rx_lock, flags);
> +}
> +
> +static void qmc_chan_start_tx(struct qmc_chan *chan)
> +{
> + unsigned long flags;
> +
> + spin_lock_irqsave(&chan->tx_lock, flags);
> +
> + /*
> + * Enable channel transmitter as it could be disabled if
> + * qmc_chan_reset() was called.
> + */
> + qmc_setbits16(chan->s_param + QMC_SPE_CHAMR, QMC_SPE_CHAMR_ENT);
> +
> + /* Set the POL bit in the channel mode register */
> + qmc_setbits16(chan->s_param + QMC_SPE_CHAMR, QMC_SPE_CHAMR_POL);
> +
> + chan->is_tx_stopped = false;
> +
> + spin_unlock_irqrestore(&chan->tx_lock, flags);
> +}
> +
> +int qmc_chan_start(struct qmc_chan *chan, int direction)
> +{
> + if (direction & QMC_CHAN_READ)
> + qmc_chan_start_rx(chan);
> +
> + if (direction & QMC_CHAN_WRITE)
> + qmc_chan_start_tx(chan);
> +
> + return 0;
> +}
> +EXPORT_SYMBOL(qmc_chan_start);
> +
> +static void qmc_chan_reset_rx(struct qmc_chan *chan)
> +{
> + struct qmc_xfer_desc *xfer_desc;
> + unsigned long flags;
> + cbd_t *__iomem bd;
> + u16 ctrl;
> +
> + spin_lock_irqsave(&chan->rx_lock, flags);
> + bd = chan->rxbds;
> + do {
> + ctrl = qmc_read16(&bd->cbd_sc);
> + qmc_write16(&bd->cbd_sc, ctrl & ~(QMC_BD_RX_UB | QMC_BD_RX_E));
> +
> + xfer_desc = &chan->rx_desc[bd - chan->rxbds];
> + xfer_desc->rx_complete = NULL;
> + xfer_desc->context = NULL;
> +
> + bd++;
> + } while (!(ctrl & QMC_BD_RX_W));
> +
> + chan->rxbd_free = chan->rxbds;
> + chan->rxbd_done = chan->rxbds;
> + qmc_write16(chan->s_param + QMC_SPE_RBPTR,
> + qmc_read16(chan->s_param + QMC_SPE_RBASE));
> +
> + chan->rx_pending = 0;
> + chan->is_rx_stopped = false;
> +
> + spin_unlock_irqrestore(&chan->rx_lock, flags);
> +}
> +
> +static void qmc_chan_reset_tx(struct qmc_chan *chan)
> +{
> + struct qmc_xfer_desc *xfer_desc;
> + unsigned long flags;
> + cbd_t *__iomem bd;
> + u16 ctrl;
> +
> + spin_lock_irqsave(&chan->tx_lock, flags);
> +
> + /* Disable transmitter. It will be re-enable on qmc_chan_start() */
> + qmc_clrbits16(chan->s_param + QMC_SPE_CHAMR, QMC_SPE_CHAMR_ENT);
> +
> + bd = chan->txbds;
> + do {
> + ctrl = qmc_read16(&bd->cbd_sc);
> + qmc_write16(&bd->cbd_sc, ctrl & ~(QMC_BD_TX_UB | QMC_BD_TX_R));
> +
> + xfer_desc = &chan->tx_desc[bd - chan->txbds];
> + xfer_desc->tx_complete = NULL;
> + xfer_desc->context = NULL;
> +
> + bd++;
> + } while (!(ctrl & QMC_BD_TX_W));
> +
> + chan->txbd_free = chan->txbds;
> + chan->txbd_done = chan->txbds;
> + qmc_write16(chan->s_param + QMC_SPE_TBPTR,
> + qmc_read16(chan->s_param + QMC_SPE_TBASE));
> +
> + /* Reset TSTATE and ZISTATE to their initial value */
> + qmc_write32(chan->s_param + QMC_SPE_TSTATE, 0x30000000);
> + qmc_write32(chan->s_param + QMC_SPE_ZISTATE, 0x00000100);
> +
> + spin_unlock_irqrestore(&chan->tx_lock, flags);
> +}
> +
> +int qmc_chan_reset(struct qmc_chan *chan, int direction)
> +{
> + if (direction & QMC_CHAN_READ)
> + qmc_chan_reset_rx(chan);
> +
> + if (direction & QMC_CHAN_WRITE)
> + qmc_chan_reset_tx(chan);
> +
> + return 0;
> +}
> +EXPORT_SYMBOL(qmc_chan_reset);
> +
> +static int qmc_check_chans(struct qmc *qmc)
> +{
> + struct tsa_serial_info info;
> + bool is_one_table = false;
> + struct qmc_chan *chan;
> + u64 tx_ts_mask = 0;
> + u64 rx_ts_mask = 0;
> + u64 tx_ts_assigned_mask;
> + u64 rx_ts_assigned_mask;
> + int ret;
> +
> + /* Retrieve info from the TSA related serial */
> + ret = tsa_serial_get_info(qmc->tsa_serial, &info);
> + if (ret)
> + return ret;
> +
> + /*
> + * If more than 32 TS are assigned to this serial, one common table is
> + * used for Tx and Rx and so masks must be equal for all channels.
> + */
> + if ((info.nb_tx_ts > 32) || (info.nb_rx_ts > 32)) {
> + if (info.nb_tx_ts != info.nb_rx_ts) {
> + dev_err(qmc->dev, "Number of TSA Tx/Rx TS assigned are not equal\n");
> + return -EINVAL;
> + }
> + is_one_table = true;
> + }
> +
> +
> + tx_ts_assigned_mask = (((u64)1) << info.nb_tx_ts) - 1;
> + rx_ts_assigned_mask = (((u64)1) << info.nb_rx_ts) - 1;
> +
> + list_for_each_entry(chan, &qmc->chan_head, list) {
> + if (chan->tx_ts_mask > tx_ts_assigned_mask) {
> + dev_err(qmc->dev, "chan %u uses TSA unassigned Tx TS\n", chan->id);
> + return -EINVAL;
> + }
> + if (tx_ts_mask & chan->tx_ts_mask) {
> + dev_err(qmc->dev, "chan %u uses an already used Tx TS\n", chan->id);
> + return -EINVAL;
> + }
> +
> + if (chan->rx_ts_mask > rx_ts_assigned_mask) {
> + dev_err(qmc->dev, "chan %u uses TSA unassigned Rx TS\n", chan->id);
> + return -EINVAL;
> + }
> + if (rx_ts_mask & chan->rx_ts_mask) {
> + dev_err(qmc->dev, "chan %u uses an already used Rx TS\n", chan->id);
> + return -EINVAL;
> + }
> +
> + if (is_one_table && (chan->tx_ts_mask != chan->rx_ts_mask)) {
> + dev_err(qmc->dev, "chan %u uses different Rx and Tx TS\n", chan->id);
> + return -EINVAL;
> + }
> +
> + tx_ts_mask |= chan->tx_ts_mask;
> + rx_ts_mask |= chan->rx_ts_mask;
> + }
> +
> + return 0;
> +}
> +
> +static unsigned int qmc_nb_chans(struct qmc *qmc)
> +{
> + unsigned int count = 0;
> + struct qmc_chan *chan;
> +
> + list_for_each_entry(chan, &qmc->chan_head, list)
> + count++;
> +
> + return count;
> +}
> +
> +static int qmc_of_parse_chans(struct qmc *qmc, struct device_node *np)
> +{
> + struct device_node *chan_np;
> + struct qmc_chan *chan;
> + const char *mode;
> + u32 chan_id;
> + u64 ts_mask;
> + int ret;
> +
> + for_each_available_child_of_node(np, chan_np) {
> + ret = of_property_read_u32(chan_np, "reg", &chan_id);
> + if (ret) {
> + dev_err(qmc->dev, "%pOF: failed to read reg\n", chan_np);
> + of_node_put(chan_np);
> + return ret;
> + }
> + if (chan_id > 63) {
> + dev_err(qmc->dev, "%pOF: Invalid chan_id\n", chan_np);
> + of_node_put(chan_np);
> + return -EINVAL;
> + }
> +
> + chan = devm_kzalloc(qmc->dev, sizeof(*chan), GFP_KERNEL);
> + if (!chan) {
> + of_node_put(chan_np);
> + return -ENOMEM;
> + }
> +
> + chan->id = chan_id;
> + spin_lock_init(&chan->rx_lock);
> + spin_lock_init(&chan->tx_lock);
> +
> + ret = of_property_read_u64(chan_np, "fsl,tx-ts-mask", &ts_mask);
> + if (ret) {
> + dev_err(qmc->dev, "%pOF: failed to read fsl,tx-ts-mask\n",
> + chan_np);
> + of_node_put(chan_np);
> + return ret;
> + }
> + chan->tx_ts_mask = ts_mask;
> +
> + ret = of_property_read_u64(chan_np, "fsl,rx-ts-mask", &ts_mask);
> + if (ret) {
> + dev_err(qmc->dev, "%pOF: failed to read fsl,rx-ts-mask\n",
> + chan_np);
> + of_node_put(chan_np);
> + return ret;
> + }
> + chan->rx_ts_mask = ts_mask;
> +
> + mode = "transparent";
> + ret = of_property_read_string(chan_np, "fsl,operational-mode", &mode);
> + if (ret && ret != -EINVAL) {
> + dev_err(qmc->dev, "%pOF: failed to read fsl,operational-mode\n",
> + chan_np);
> + of_node_put(chan_np);
> + return ret;
> + }
> + if (!strcmp(mode, "transparent")) {
> + chan->mode = QMC_TRANSPARENT;
> + } else if (!strcmp(mode, "hdlc")) {
> + chan->mode = QMC_HDLC;
> + } else {
> + dev_err(qmc->dev, "%pOF: Invalid fsl,operational-mode (%s)\n",
> + chan_np, mode);
> + of_node_put(chan_np);
> + return -EINVAL;
> + }
> +
> + chan->is_reverse_data = of_property_read_bool(chan_np,
> + "fsl,reverse-data");
> +
> + list_add_tail(&chan->list, &qmc->chan_head);
> + qmc->chans[chan->id] = chan;
> + }
> +
> + return qmc_check_chans(qmc);
> +}
> +
> +static int qmc_setup_tsa_64rxtx(struct qmc *qmc, const struct tsa_serial_info *info)
> +{
> + struct qmc_chan *chan;
> + unsigned int i;
> + u16 val;
> +
> + /*
> + * Use a common Tx/Rx 64 entries table.
> + * Everything was previously checked, Tx and Rx related stuffs are
> + * identical -> Used Rx related stuff to build the table
> + */
> +
> + /* Invalidate all entries */
> + for (i = 0; i < 64; i++)
> + qmc_write16(qmc->scc_pram + QMC_GBL_TSATRX + (i * 2), 0x0000);
> +
> + /* Set entries based on Rx stuff*/
> + list_for_each_entry(chan, &qmc->chan_head, list) {
> + for (i = 0; i < info->nb_rx_ts; i++) {
> + if (!(chan->rx_ts_mask & (((u64)1) << i)))
> + continue;
> +
> + val = QMC_TSA_VALID | QMC_TSA_MASK |
> + QMC_TSA_CHANNEL(chan->id);
> + qmc_write16(qmc->scc_pram + QMC_GBL_TSATRX + (i * 2), val);
> + }
> + }
> +
> + /* Set Wrap bit on last entry */
> + qmc_setbits16(qmc->scc_pram + QMC_GBL_TSATRX + ((info->nb_rx_ts - 1) * 2),
> + QMC_TSA_WRAP);
> +
> + /* Init pointers to the table */
> + val = qmc->scc_pram_offset + QMC_GBL_TSATRX;
> + qmc_write16(qmc->scc_pram + QMC_GBL_RX_S_PTR, val);
> + qmc_write16(qmc->scc_pram + QMC_GBL_RXPTR, val);
> + qmc_write16(qmc->scc_pram + QMC_GBL_TX_S_PTR, val);
> + qmc_write16(qmc->scc_pram + QMC_GBL_TXPTR, val);
> +
> + return 0;
> +}
> +
> +static int qmc_setup_tsa_32rx_32tx(struct qmc *qmc, const struct tsa_serial_info *info)
> +{
> + struct qmc_chan *chan;
> + unsigned int i;
> + u16 val;
> +
> + /*
> + * Use a Tx 32 entries table and a Rx 32 entries table.
> + * Everything was previously checked.
> + */
> +
> + /* Invalidate all entries */
> + for (i = 0; i < 32; i++) {
> + qmc_write16(qmc->scc_pram + QMC_GBL_TSATRX + (i * 2), 0x0000);
> + qmc_write16(qmc->scc_pram + QMC_GBL_TSATTX + (i * 2), 0x0000);
> + }
> +
> + /* Set entries based on Rx and Tx stuff*/
> + list_for_each_entry(chan, &qmc->chan_head, list) {
> + /* Rx part */
> + for (i = 0; i < info->nb_rx_ts; i++) {
> + if (!(chan->rx_ts_mask & (((u64)1) << i)))
> + continue;
> +
> + val = QMC_TSA_VALID | QMC_TSA_MASK |
> + QMC_TSA_CHANNEL(chan->id);
> + qmc_write16(qmc->scc_pram + QMC_GBL_TSATRX + (i * 2), val);
> + }
> + /* Tx part */
> + for (i = 0; i < info->nb_tx_ts; i++) {
> + if (!(chan->tx_ts_mask & (((u64)1) << i)))
> + continue;
> +
> + val = QMC_TSA_VALID | QMC_TSA_MASK |
> + QMC_TSA_CHANNEL(chan->id);
> + qmc_write16(qmc->scc_pram + QMC_GBL_TSATTX + (i * 2), val);
> + }
> + }
> +
> + /* Set Wrap bit on last entries */
> + qmc_setbits16(qmc->scc_pram + QMC_GBL_TSATRX + ((info->nb_rx_ts - 1) * 2),
> + QMC_TSA_WRAP);
> + qmc_setbits16(qmc->scc_pram + QMC_GBL_TSATTX + ((info->nb_tx_ts - 1) * 2),
> + QMC_TSA_WRAP);
> +
> + /* Init Rx pointers ...*/
> + val = qmc->scc_pram_offset + QMC_GBL_TSATRX;
> + qmc_write16(qmc->scc_pram + QMC_GBL_RX_S_PTR, val);
> + qmc_write16(qmc->scc_pram + QMC_GBL_RXPTR, val);
> +
> + /* ... and Tx pointers */
> + val = qmc->scc_pram_offset + QMC_GBL_TSATTX;
> + qmc_write16(qmc->scc_pram + QMC_GBL_TX_S_PTR, val);
> + qmc_write16(qmc->scc_pram + QMC_GBL_TXPTR, val);
> +
> + return 0;
> +}
> +
> +static int qmc_setup_tsa(struct qmc *qmc)
> +{
> + struct tsa_serial_info info;
> + int ret;
> +
> + /* Retrieve info from the TSA related serial */
> + ret = tsa_serial_get_info(qmc->tsa_serial, &info);
> + if (ret)
> + return ret;
> +
> + /*
> + * Setup one common 64 entries table or two 32 entries (one for Tx and
> + * one for Tx) according to assigned TS numbers.
> + */
> + return ((info.nb_tx_ts > 32) || (info.nb_rx_ts > 32)) ?
> + qmc_setup_tsa_64rxtx(qmc, &info) :
> + qmc_setup_tsa_32rx_32tx(qmc, &info);
> +}
> +
> +static int qmc_setup_chan_trnsync(struct qmc *qmc, struct qmc_chan *chan)
> +{
> + struct tsa_serial_info info;
> + u16 first_rx, last_tx;
> + u16 trnsync;
> + int ret;
> +
> + /* Retrieve info from the TSA related serial */
> + ret = tsa_serial_get_info(chan->qmc->tsa_serial, &info);
> + if (ret)
> + return ret;
> +
> + /* Find the first Rx TS allocated to the channel */
> + first_rx = chan->rx_ts_mask ? __ffs64(chan->rx_ts_mask) + 1 : 0;
> +
> + /* Find the last Tx TS allocated to the channel */
> + last_tx = fls64(chan->tx_ts_mask);
> +
> + trnsync = 0;
> + if (info.nb_rx_ts)
> + trnsync |= QMC_SPE_TRNSYNC_RX((first_rx % info.nb_rx_ts) * 2);
> + if (info.nb_tx_ts)
> + trnsync |= QMC_SPE_TRNSYNC_TX((last_tx % info.nb_tx_ts) * 2);
> +
> + qmc_write16(chan->s_param + QMC_SPE_TRNSYNC, trnsync);
> +
> + dev_dbg(qmc->dev, "chan %u: trnsync=0x%04x, rx %u/%u 0x%llx, tx %u/%u 0x%llx\n",
> + chan->id, trnsync,
> + first_rx, info.nb_rx_ts, chan->rx_ts_mask,
> + last_tx, info.nb_tx_ts, chan->tx_ts_mask);
> +
> + return 0;
> +}
> +
> +static int qmc_setup_chan(struct qmc *qmc, struct qmc_chan *chan)
> +{
> + unsigned int i;
> + cbd_t __iomem *bd;
> + int ret;
> + u16 val;
> +
> + chan->qmc = qmc;
> +
> + /* Set channel specific parameter base address */
> + chan->s_param = qmc->dpram + (chan->id * 64);
> + /* 16 bd per channel (8 rx and 8 tx) */
> + chan->txbds = qmc->bd_table + (chan->id * (QMC_NB_TXBDS + QMC_NB_RXBDS));
> + chan->rxbds = qmc->bd_table + (chan->id * (QMC_NB_TXBDS + QMC_NB_RXBDS)) + QMC_NB_TXBDS;
> +
> + chan->txbd_free = chan->txbds;
> + chan->txbd_done = chan->txbds;
> + chan->rxbd_free = chan->rxbds;
> + chan->rxbd_done = chan->rxbds;
> +
> + /* TBASE and TBPTR*/
> + val = chan->id * (QMC_NB_TXBDS + QMC_NB_RXBDS) * sizeof(cbd_t);
> + qmc_write16(chan->s_param + QMC_SPE_TBASE, val);
> + qmc_write16(chan->s_param + QMC_SPE_TBPTR, val);
> +
> + /* RBASE and RBPTR*/
> + val = ((chan->id * (QMC_NB_TXBDS + QMC_NB_RXBDS)) + QMC_NB_TXBDS) * sizeof(cbd_t);
> + qmc_write16(chan->s_param + QMC_SPE_RBASE, val);
> + qmc_write16(chan->s_param + QMC_SPE_RBPTR, val);
> + qmc_write32(chan->s_param + QMC_SPE_TSTATE, 0x30000000);
> + qmc_write32(chan->s_param + QMC_SPE_RSTATE, 0x31000000);
> + qmc_write32(chan->s_param + QMC_SPE_ZISTATE, 0x00000100);
> + if (chan->mode == QMC_TRANSPARENT) {
> + qmc_write32(chan->s_param + QMC_SPE_ZDSTATE, 0x18000080);
> + qmc_write16(chan->s_param + QMC_SPE_TMRBLR, 60);
> + val = QMC_SPE_CHAMR_MODE_TRANSP | QMC_SPE_CHAMR_TRANSP_SYNC;
> + if (chan->is_reverse_data)
> + val |= QMC_SPE_CHAMR_TRANSP_RD;
> + qmc_write16(chan->s_param + QMC_SPE_CHAMR, val);
> + ret = qmc_setup_chan_trnsync(qmc, chan);
> + if (ret)
> + return ret;
> + } else {
> + qmc_write32(chan->s_param + QMC_SPE_ZDSTATE, 0x00000080);
> + qmc_write16(chan->s_param + QMC_SPE_MFLR, 60);
> + qmc_write16(chan->s_param + QMC_SPE_CHAMR,
> + QMC_SPE_CHAMR_MODE_HDLC | QMC_SPE_CHAMR_HDLC_IDLM);
> + }
> +
> + /* Do not enable interrupts now. They will be enabled later */
> + qmc_write16(chan->s_param + QMC_SPE_INTMSK, 0x0000);
> +
> + /* Init Rx BDs and set Wrap bit on last descriptor */
> + BUILD_BUG_ON(QMC_NB_RXBDS == 0);
> + val = QMC_BD_RX_I;
> + for (i = 0; i < QMC_NB_RXBDS; i++) {
> + bd = chan->rxbds + i;
> + qmc_write16(&bd->cbd_sc, val);
> + }
> + bd = chan->rxbds + QMC_NB_RXBDS - 1;
> + qmc_write16(&bd->cbd_sc, val | QMC_BD_RX_W);
> +
> + /* Init Tx BDs and set Wrap bit on last descriptor */
> + BUILD_BUG_ON(QMC_NB_TXBDS == 0);
> + val = QMC_BD_TX_I;
> + if (chan->mode == QMC_HDLC)
> + val |= QMC_BD_TX_L | QMC_BD_TX_TC;
> + for (i = 0; i < QMC_NB_TXBDS; i++) {
> + bd = chan->txbds + i;
> + qmc_write16(&bd->cbd_sc, val);
> + }
> + bd = chan->txbds + QMC_NB_TXBDS - 1;
> + qmc_write16(&bd->cbd_sc, val | QMC_BD_TX_W);
> +
> + return 0;
> +}
> +
> +static int qmc_setup_chans(struct qmc *qmc)
> +{
> + struct qmc_chan *chan;
> + int ret;
> +
> + list_for_each_entry(chan, &qmc->chan_head, list) {
> + ret = qmc_setup_chan(qmc, chan);
> + if (ret)
> + return ret;
> + }
> +
> + return 0;
> +}
> +
> +static int qmc_finalize_chans(struct qmc *qmc)
> +{
> + struct qmc_chan *chan;
> + int ret;
> +
> + list_for_each_entry(chan, &qmc->chan_head, list) {
> + /* Unmask channel interrupts */
> + if (chan->mode == QMC_HDLC) {
> + qmc_write16(chan->s_param + QMC_SPE_INTMSK,
> + QMC_INT_NID | QMC_INT_IDL | QMC_INT_MRF |
> + QMC_INT_UN | QMC_INT_RXF | QMC_INT_BSY |
> + QMC_INT_TXB | QMC_INT_RXB);
> + } else {
> + qmc_write16(chan->s_param + QMC_SPE_INTMSK,
> + QMC_INT_UN | QMC_INT_BSY |
> + QMC_INT_TXB | QMC_INT_RXB);
> + }
> +
> + /* Forced stop the channel */
> + ret = qmc_chan_stop(chan, QMC_CHAN_ALL);
> + if (ret)
> + return ret;
> + }
> +
> + return 0;
> +}
> +
> +static int qmc_setup_ints(struct qmc *qmc)
> +{
> + unsigned int i;
> + u16 __iomem *last;
> +
> + /* Raz all entries */
> + for (i = 0; i < (qmc->int_size / sizeof(u16)); i++)
> + qmc_write16(qmc->int_table + i, 0x0000);
> +
> + /* Set Wrap bit on last entry */
> + if (qmc->int_size >= sizeof(u16)) {
> + last = qmc->int_table + (qmc->int_size / sizeof(u16)) - 1;
> + qmc_write16(last, QMC_INT_W);
> + }
> +
> + return 0;
> +}
> +
> +static void qmc_irq_gint(struct qmc *qmc)
> +{
> + struct qmc_chan *chan;
> + unsigned int chan_id;
> + unsigned long flags;
> + u16 int_entry;
> +
> + int_entry = qmc_read16(qmc->int_curr);
> + while (int_entry & QMC_INT_V) {
> + /* Clear all but the Wrap bit */
> + qmc_write16(qmc->int_curr, int_entry & QMC_INT_W);
> +
> + chan_id = QMC_INT_GET_CHANNEL(int_entry);
> + chan = qmc->chans[chan_id];
> + if (!chan) {
> + dev_err(qmc->dev, "interrupt on invalid chan %u\n", chan_id);
> + goto int_next;
> + }
> +
> + if (int_entry & QMC_INT_TXB)
> + qmc_chan_write_done(chan);
> +
> + if (int_entry & QMC_INT_UN) {
> + dev_info(qmc->dev, "intr chan %u, 0x%04x (UN)\n", chan_id,
> + int_entry);
> + chan->nb_tx_underrun++;
> + }
> +
> + if (int_entry & QMC_INT_BSY) {
> + dev_info(qmc->dev, "intr chan %u, 0x%04x (BSY)\n", chan_id,
> + int_entry);
> + chan->nb_rx_busy++;
> + /* Restart the receiver if needed */
> + spin_lock_irqsave(&chan->rx_lock, flags);
> + if (chan->rx_pending && !chan->is_rx_stopped) {
> + if (chan->mode == QMC_TRANSPARENT)
> + qmc_write32(chan->s_param + QMC_SPE_ZDSTATE, 0x18000080);
> + else
> + qmc_write32(chan->s_param + QMC_SPE_ZDSTATE, 0x00000080);
> + qmc_write32(chan->s_param + QMC_SPE_RSTATE, 0x31000000);
> + chan->is_rx_halted = false;
> + } else {
> + chan->is_rx_halted = true;
> + }
> + spin_unlock_irqrestore(&chan->rx_lock, flags);
> + }
> +
> + if (int_entry & QMC_INT_RXB)
> + qmc_chan_read_done(chan);
> +
> +int_next:
> + if (int_entry & QMC_INT_W)
> + qmc->int_curr = qmc->int_table;
> + else
> + qmc->int_curr++;
> + int_entry = qmc_read16(qmc->int_curr);
> + }
> +}
> +
> +static irqreturn_t qmc_irq_handler(int irq, void *priv)
> +{
> + struct qmc *qmc = (struct qmc *)priv;
> + u16 scce;
> +
> + scce = qmc_read16(qmc->scc_regs + SCC_SCCE);
> + qmc_write16(qmc->scc_regs + SCC_SCCE, scce);
> +
> + if (unlikely(scce & SCC_SCCE_IQOV))
> + dev_info(qmc->dev, "IRQ queue overflow\n");
> +
> + if (unlikely(scce & SCC_SCCE_GUN))
> + dev_err(qmc->dev, "Global transmitter underrun\n");
> +
> + if (unlikely(scce & SCC_SCCE_GOV))
> + dev_err(qmc->dev, "Global receiver overrun\n");
> +
> + /* normal interrupt */
> + if (likely(scce & SCC_SCCE_GINT))
> + qmc_irq_gint(qmc);
> +
> + return IRQ_HANDLED;
> +}
> +
> +static int qmc_probe(struct platform_device *pdev)
> +{
> + struct device_node *np = pdev->dev.of_node;
> + unsigned int nb_chans;
> + struct resource *res;
> + struct qmc *qmc;
> + int irq;
> + int ret;
> +
> + qmc = devm_kzalloc(&pdev->dev, sizeof(*qmc), GFP_KERNEL);
> + if (!qmc)
> + return -ENOMEM;
> +
> + qmc->dev = &pdev->dev;
> + INIT_LIST_HEAD(&qmc->chan_head);
> +
> + qmc->scc_regs = devm_platform_ioremap_resource_byname(pdev, "scc_regs");
> + if (IS_ERR(qmc->scc_regs))
> + return PTR_ERR(qmc->scc_regs);
> +
> +
> + res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "scc_pram");
> + if (!res)
> + return -EINVAL;
> + qmc->scc_pram_offset = res->start - get_immrbase();
> + qmc->scc_pram = devm_ioremap_resource(qmc->dev, res);
> + if (IS_ERR(qmc->scc_pram))
> + return PTR_ERR(qmc->scc_pram);
> +
> + qmc->dpram = devm_platform_ioremap_resource_byname(pdev, "dpram");
> + if (IS_ERR(qmc->dpram))
> + return PTR_ERR(qmc->dpram);
> +
> + qmc->tsa_serial = devm_tsa_serial_get_byphandle(qmc->dev, np, "fsl,tsa-serial");
> + if (IS_ERR(qmc->tsa_serial)) {
> + return dev_err_probe(qmc->dev, PTR_ERR(qmc->tsa_serial),
> + "Failed to get TSA serial\n");
> + }
> +
> + /* Connect the serial (SCC) to TSA */
> + ret = tsa_serial_connect(qmc->tsa_serial);
> + if (ret) {
> + dev_err(qmc->dev, "Failed to connect TSA serial\n");
> + return ret;
> + }
> +
> + /* Parse channels informationss */
> + ret = qmc_of_parse_chans(qmc, np);
> + if (ret)
> + goto err_tsa_serial_disconnect;
> +
> + nb_chans = qmc_nb_chans(qmc);
> +
> + /* Init GMSR_H and GMSR_L registers */
> + qmc_write32(qmc->scc_regs + SCC_GSMRH,
> + SCC_GSMRH_CDS | SCC_GSMRH_CTSS | SCC_GSMRH_CDP | SCC_GSMRH_CTSP);
> +
> + /* enable QMC mode */
> + qmc_write32(qmc->scc_regs + SCC_GSMRL, SCC_GSMRL_MODE_QMC);
> +
> + /*
> + * Allocate the buffer descriptor table
> + * 8 rx and 8 tx descriptors per channel
> + */
> + qmc->bd_size = (nb_chans * (QMC_NB_TXBDS + QMC_NB_RXBDS)) * sizeof(cbd_t);
> + qmc->bd_table = dmam_alloc_coherent(qmc->dev, qmc->bd_size,
> + &qmc->bd_dma_addr, GFP_KERNEL);
> + if (!qmc->bd_table) {
> + dev_err(qmc->dev, "Failed to allocate bd table\n");
> + ret = -ENOMEM;
> + goto err_tsa_serial_disconnect;
> + }
> + memset(qmc->bd_table, 0, qmc->bd_size);
> +
> + qmc_write32(qmc->scc_pram + QMC_GBL_MCBASE, qmc->bd_dma_addr);
> +
> + /* Allocate the interrupt table */
> + qmc->int_size = QMC_NB_INTS * sizeof(u16);
> + qmc->int_table = dmam_alloc_coherent(qmc->dev, qmc->int_size,
> + &qmc->int_dma_addr, GFP_KERNEL);
> + if (!qmc->int_table) {
> + dev_err(qmc->dev, "Failed to allocate interrupt table\n");
> + ret = -ENOMEM;
> + goto err_tsa_serial_disconnect;
> + }
> + memset(qmc->int_table, 0, qmc->int_size);
> +
> + qmc->int_curr = qmc->int_table;
> + qmc_write32(qmc->scc_pram + QMC_GBL_INTBASE, qmc->int_dma_addr);
> + qmc_write32(qmc->scc_pram + QMC_GBL_INTPTR, qmc->int_dma_addr);
> +
> + /* Set MRBLR (valid for HDLC only) max MRU + max CRC */
> + qmc_write16(qmc->scc_pram + QMC_GBL_MRBLR, HDLC_MAX_MRU + 4);
> +
> + qmc_write16(qmc->scc_pram + QMC_GBL_GRFTHR, 1);
> + qmc_write16(qmc->scc_pram + QMC_GBL_GRFCNT, 1);
> +
> + qmc_write32(qmc->scc_pram + QMC_GBL_C_MASK32, 0xDEBB20E3);
> + qmc_write16(qmc->scc_pram + QMC_GBL_C_MASK16, 0xF0B8);
> +
> + ret = qmc_setup_tsa(qmc);
> + if (ret)
> + goto err_tsa_serial_disconnect;
> +
> + qmc_write16(qmc->scc_pram + QMC_GBL_QMCSTATE, 0x8000);
> +
> + ret = qmc_setup_chans(qmc);
> + if (ret)
> + goto err_tsa_serial_disconnect;
> +
> + /* Init interrupts table */
> + ret = qmc_setup_ints(qmc);
> + if (ret)
> + goto err_tsa_serial_disconnect;
> +
> + /* Disable and clear interrupts, set the irq handler */
> + qmc_write16(qmc->scc_regs + SCC_SCCM, 0x0000);
> + qmc_write16(qmc->scc_regs + SCC_SCCE, 0x000F);
> + irq = platform_get_irq(pdev, 0);
> + if (irq < 0)
> + goto err_tsa_serial_disconnect;
> + ret = devm_request_irq(qmc->dev, irq, qmc_irq_handler, 0, "qmc", qmc);
> + if (ret < 0)
> + goto err_tsa_serial_disconnect;
> +
> + /* Enable interrupts */
> + qmc_write16(qmc->scc_regs + SCC_SCCM,
> + SCC_SCCE_IQOV | SCC_SCCE_GINT | SCC_SCCE_GUN | SCC_SCCE_GOV);
> +
> + ret = qmc_finalize_chans(qmc);
> + if (ret < 0)
> + goto err_disable_intr;
> +
> + /* Enable transmiter and receiver */
> + qmc_setbits32(qmc->scc_regs + SCC_GSMRL, SCC_GSMRL_ENR | SCC_GSMRL_ENT);
> +
> + platform_set_drvdata(pdev, qmc);
> +
> + return 0;
> +
> +err_disable_intr:
> + qmc_write16(qmc->scc_regs + SCC_SCCM, 0);
> +
> +err_tsa_serial_disconnect:
> + tsa_serial_disconnect(qmc->tsa_serial);
> + return ret;
> +}
> +
> +static int qmc_remove(struct platform_device *pdev)
> +{
> + struct qmc *qmc = platform_get_drvdata(pdev);
> +
> + /* Disable transmiter and receiver */
> + qmc_setbits32(qmc->scc_regs + SCC_GSMRL, 0);
> +
> + /* Disable interrupts */
> + qmc_write16(qmc->scc_regs + SCC_SCCM, 0);
> +
> + /* Disconnect the serial from TSA */
> + tsa_serial_disconnect(qmc->tsa_serial);
> +
> + return 0;
> +}
> +
> +static const struct of_device_id qmc_id_table[] = {
> + { .compatible = "fsl,cpm1-scc-qmc" },
> + {} /* sentinel */
> +};
> +MODULE_DEVICE_TABLE(of, qmc_id_table);
> +
> +static struct platform_driver qmc_driver = {
> + .driver = {
> + .name = "fsl-qmc",
> + .of_match_table = of_match_ptr(qmc_id_table),
> + },
> + .probe = qmc_probe,
> + .remove = qmc_remove,
> +};
> +module_platform_driver(qmc_driver);
> +
> +struct qmc_chan *qmc_chan_get_byphandle(struct device_node *np, const char *phandle_name)
> +{
> + struct of_phandle_args out_args;
> + struct platform_device *pdev;
> + struct qmc_chan *qmc_chan;
> + struct qmc *qmc;
> + int ret;
> +
> + ret = of_parse_phandle_with_fixed_args(np, phandle_name, 1, 0,
> + &out_args);
> + if (ret < 0)
> + return ERR_PTR(ret);
> +
> + if (!of_match_node(qmc_driver.driver.of_match_table, out_args.np)) {
> + of_node_put(out_args.np);
> + return ERR_PTR(-EINVAL);
> + }
> +
> + pdev = of_find_device_by_node(out_args.np);
> + of_node_put(out_args.np);
> + if (!pdev)
> + return ERR_PTR(-ENODEV);
> +
> + qmc = platform_get_drvdata(pdev);
> + if (!qmc) {
> + platform_device_put(pdev);
> + return ERR_PTR(-EPROBE_DEFER);
> + }
> +
> + if (out_args.args_count != 1) {
> + platform_device_put(pdev);
> + return ERR_PTR(-EINVAL);
> + }
> +
> + if (out_args.args[0] >= ARRAY_SIZE(qmc->chans)) {
> + platform_device_put(pdev);
> + return ERR_PTR(-EINVAL);
> + }
> +
> + qmc_chan = qmc->chans[out_args.args[0]];
> + if (!qmc_chan) {
> + platform_device_put(pdev);
> + return ERR_PTR(-ENOENT);
> + }
> +
> + return qmc_chan;
> +}
> +EXPORT_SYMBOL(qmc_chan_get_byphandle);
> +
> +void qmc_chan_put(struct qmc_chan *chan)
> +{
> + put_device(chan->qmc->dev);
> +}
> +EXPORT_SYMBOL(qmc_chan_put);
> +
> +static void devm_qmc_chan_release(struct device *dev, void *res)
> +{
> + struct qmc_chan **qmc_chan = res;
> +
> + qmc_chan_put(*qmc_chan);
> +}
> +
> +struct qmc_chan *devm_qmc_chan_get_byphandle(struct device *dev,
> + struct device_node *np,
> + const char *phandle_name)
> +{
> + struct qmc_chan *qmc_chan;
> + struct qmc_chan **dr;
> +
> + dr = devres_alloc(devm_qmc_chan_release, sizeof(*dr), GFP_KERNEL);
> + if (!dr)
> + return ERR_PTR(-ENOMEM);
> +
> + qmc_chan = qmc_chan_get_byphandle(np, phandle_name);
> + if (!IS_ERR(qmc_chan)) {
> + *dr = qmc_chan;
> + devres_add(dev, dr);
> + } else {
> + devres_free(dr);
> + }
> +
> + return qmc_chan;
> +}
> +EXPORT_SYMBOL(devm_qmc_chan_get_byphandle);
> +
> +MODULE_AUTHOR("Herve Codina <herve.codina@...tlin.com>");
> +MODULE_DESCRIPTION("CPM QMC driver");
> +MODULE_LICENSE("GPL");
> diff --git a/include/soc/fsl/qe/qmc.h b/include/soc/fsl/qe/qmc.h
> new file mode 100644
> index 000000000000..3c61a50d2ae2
> --- /dev/null
> +++ b/include/soc/fsl/qe/qmc.h
> @@ -0,0 +1,71 @@
> +/* SPDX-License-Identifier: GPL-2.0-or-later */
> +/*
> + * QMC management
> + *
> + * Copyright 2022 CS GROUP France
> + *
> + * Author: Herve Codina <herve.codina@...tlin.com>
> + */
> +#ifndef __SOC_FSL_QMC_H__
> +#define __SOC_FSL_QMC_H__
> +
> +#include <linux/types.h>
> +
> +struct device_node;
> +struct device;
> +struct qmc_chan;
> +
> +struct qmc_chan *qmc_chan_get_byphandle(struct device_node *np, const char *phandle_name);
> +void qmc_chan_put(struct qmc_chan *chan);
> +struct qmc_chan *devm_qmc_chan_get_byphandle(struct device *dev, struct device_node *np,
> + const char *phandle_name);
> +
> +enum qmc_mode {
> + QMC_TRANSPARENT,
> + QMC_HDLC,
> +};
> +
> +struct qmc_chan_info {
> + enum qmc_mode mode;
> + unsigned long rx_fs_rate;
> + unsigned long rx_bit_rate;
> + u8 nb_rx_ts;
> + unsigned long tx_fs_rate;
> + unsigned long tx_bit_rate;
> + u8 nb_tx_ts;
> +};
> +
> +int qmc_chan_get_info(struct qmc_chan *chan, struct qmc_chan_info *info);
> +
> +struct qmc_chan_param {
> + enum qmc_mode mode;
> + union {
> + struct {
> + u16 max_rx_buf_size;
> + u16 max_rx_frame_size;
> + bool is_crc32;
> + } hdlc;
> + struct {
> + u16 max_rx_buf_size;
> + } transp;
> + };
> +};
> +
> +int qmc_chan_set_param(struct qmc_chan *chan, const struct qmc_chan_param *param);
> +
> +int qmc_chan_write_submit(struct qmc_chan *chan, dma_addr_t addr, size_t length,
> + void (*complete)(void *context), void *context);
> +
> +int qmc_chan_read_submit(struct qmc_chan *chan, dma_addr_t addr, size_t length,
> + void (*complete)(void *context, size_t length),
> + void *context);
> +
> +#define QMC_CHAN_READ (1<<0)
> +#define QMC_CHAN_WRITE (1<<1)
> +#define QMC_CHAN_ALL (QMC_CHAN_READ | QMC_CHAN_WRITE)
> +
> +int qmc_chan_start(struct qmc_chan *chan, int direction);
> +int qmc_chan_stop(struct qmc_chan *chan, int direction);
> +int qmc_chan_reset(struct qmc_chan *chan, int direction);
> +
> +#endif /* __SOC_FSL_QMC_H__ */
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