| Author | Tokens | Token Proportion | Commits | Commit Proportion |
|---|---|---|---|---|
| Herve Codina | 7057 | 99.31% | 1 | 50.00% |
| Herve Codina via Alsa-devel | 49 | 0.69% | 1 | 50.00% |
| Total | 7106 | 2 |
// SPDX-License-Identifier: GPL-2.0 /* * QMC driver * * Copyright 2022 CS GROUP France * * Author: Herve Codina <herve.codina@bootlin.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 ((info.nb_tx_ts > 64) || (info.nb_rx_ts > 64)) { dev_err(qmc->dev, "Number of TSA Tx/Rx TS assigned not supported\n"); return -EINVAL; } /* * 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 = info.nb_tx_ts == 64 ? U64_MAX : (((u64)1) << info.nb_tx_ts) - 1; rx_ts_assigned_mask = info.nb_rx_ts == 64 ? U64_MAX : (((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@bootlin.com>"); MODULE_DESCRIPTION("CPM QMC driver"); MODULE_LICENSE("GPL");
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