From 5b7c4cabbb65f5c469464da6c5f614cbd7f730f2 Mon Sep 17 00:00:00 2001 From: Linus Torvalds Date: Tue, 21 Feb 2023 18:24:12 -0800 Subject: Merge tag 'net-next-6.3' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next Pull networking updates from Jakub Kicinski: "Core: - Add dedicated kmem_cache for typical/small skb->head, avoid having to access struct page at kfree time, and improve memory use. - Introduce sysctl to set default RPS configuration for new netdevs. - Define Netlink protocol specification format which can be used to describe messages used by each family and auto-generate parsers. Add tools for generating kernel data structures and uAPI headers. - Expose all net/core sysctls inside netns. - Remove 4s sleep in netpoll if carrier is instantly detected on boot. - Add configurable limit of MDB entries per port, and port-vlan. - Continue populating drop reasons throughout the stack. - Retire a handful of legacy Qdiscs and classifiers. Protocols: - Support IPv4 big TCP (TSO frames larger than 64kB). - Add IP_LOCAL_PORT_RANGE socket option, to control local port range on socket by socket basis. - Track and report in procfs number of MPTCP sockets used. - Support mixing IPv4 and IPv6 flows in the in-kernel MPTCP path manager. - IPv6: don't check net.ipv6.route.max_size and rely on garbage collection to free memory (similarly to IPv4). - Support Penultimate Segment Pop (PSP) flavor in SRv6 (RFC8986). - ICMP: add per-rate limit counters. - Add support for user scanning requests in ieee802154. - Remove static WEP support. - Support minimal Wi-Fi 7 Extremely High Throughput (EHT) rate reporting. - WiFi 7 EHT channel puncturing support (client & AP). BPF: - Add a rbtree data structure following the "next-gen data structure" precedent set by recently added linked list, that is, by using kfunc + kptr instead of adding a new BPF map type. - Expose XDP hints via kfuncs with initial support for RX hash and timestamp metadata. - Add BPF_F_NO_TUNNEL_KEY extension to bpf_skb_set_tunnel_key to better support decap on GRE tunnel devices not operating in collect metadata. - Improve x86 JIT's codegen for PROBE_MEM runtime error checks. - Remove the need for trace_printk_lock for bpf_trace_printk and bpf_trace_vprintk helpers. - Extend libbpf's bpf_tracing.h support for tracing arguments of kprobes/uprobes and syscall as a special case. - Significantly reduce the search time for module symbols by livepatch and BPF. - Enable cpumasks to be used as kptrs, which is useful for tracing programs tracking which tasks end up running on which CPUs in different time intervals. - Add support for BPF trampoline on s390x and riscv64. - Add capability to export the XDP features supported by the NIC. - Add __bpf_kfunc tag for marking kernel functions as kfuncs. - Add cgroup.memory=nobpf kernel parameter option to disable BPF memory accounting for container environments. Netfilter: - Remove the CLUSTERIP target. It has been marked as obsolete for years, and we still have WARN splats wrt races of the out-of-band /proc interface installed by this target. - Add 'destroy' commands to nf_tables. They are identical to the existing 'delete' commands, but do not return an error if the referenced object (set, chain, rule...) did not exist. Driver API: - Improve cpumask_local_spread() locality to help NICs set the right IRQ affinity on AMD platforms. - Separate C22 and C45 MDIO bus transactions more clearly. - Introduce new DCB table to control DSCP rewrite on egress. - Support configuration of Physical Layer Collision Avoidance (PLCA) Reconciliation Sublayer (RS) (802.3cg-2019). Modern version of shared medium Ethernet. - Support for MAC Merge layer (IEEE 802.3-2018 clause 99). Allowing preemption of low priority frames by high priority frames. - Add support for controlling MACSec offload using netlink SET. - Rework devlink instance refcounts to allow registration and de-registration under the instance lock. Split the code into multiple files, drop some of the unnecessarily granular locks and factor out common parts of netlink operation handling. - Add TX frame aggregation parameters (for USB drivers). - Add a new attr TCA_EXT_WARN_MSG to report TC (offload) warning messages with notifications for debug. - Allow offloading of UDP NEW connections via act_ct. - Add support for per action HW stats in TC. - Support hardware miss to TC action (continue processing in SW from a specific point in the action chain). - Warn if old Wireless Extension user space interface is used with modern cfg80211/mac80211 drivers. Do not support Wireless Extensions for Wi-Fi 7 devices at all. Everyone should switch to using nl80211 interface instead. - Improve the CAN bit timing configuration. Use extack to return error messages directly to user space, update the SJW handling, including the definition of a new default value that will benefit CAN-FD controllers, by increasing their oscillator tolerance. New hardware / drivers: - Ethernet: - nVidia BlueField-3 support (control traffic driver) - Ethernet support for imx93 SoCs - Motorcomm yt8531 gigabit Ethernet PHY - onsemi NCN26000 10BASE-T1S PHY (with support for PLCA) - Microchip LAN8841 PHY (incl. cable diagnostics and PTP) - Amlogic gxl MDIO mux - WiFi: - RealTek RTL8188EU (rtl8xxxu) - Qualcomm Wi-Fi 7 devices (ath12k) - CAN: - Renesas R-Car V4H Drivers: - Bluetooth: - Set Per Platform Antenna Gain (PPAG) for Intel controllers. - Ethernet NICs: - Intel (1G, igc): - support TSN / Qbv / packet scheduling features of i226 model - Intel (100G, ice): - use GNSS subsystem instead of TTY - multi-buffer XDP support - extend support for GPIO pins to E823 devices - nVidia/Mellanox: - update the shared buffer configuration on PFC commands - implement PTP adjphase function for HW offset control - TC support for Geneve and GRE with VF tunnel offload - more efficient crypto key management method - multi-port eswitch support - Netronome/Corigine: - add DCB IEEE support - support IPsec offloading for NFP3800 - Freescale/NXP (enetc): - support XDP_REDIRECT for XDP non-linear buffers - improve reconfig, avoid link flap and waiting for idle - support MAC Merge layer - Other NICs: - sfc/ef100: add basic devlink support for ef100 - ionic: rx_push mode operation (writing descriptors via MMIO) - bnxt: use the auxiliary bus abstraction for RDMA - r8169: disable ASPM and reset bus in case of tx timeout - cpsw: support QSGMII mode for J721e CPSW9G - cpts: support pulse-per-second output - ngbe: add an mdio bus driver - usbnet: optimize usbnet_bh() by avoiding unnecessary queuing - r8152: handle devices with FW with NCM support - amd-xgbe: support 10Mbps, 2.5GbE speeds and rx-adaptation - virtio-net: support multi buffer XDP - virtio/vsock: replace virtio_vsock_pkt with sk_buff - tsnep: XDP support - Ethernet high-speed switches: - nVidia/Mellanox (mlxsw): - add support for latency TLV (in FW control messages) - Microchip (sparx5): - separate explicit and implicit traffic forwarding rules, make the implicit rules always active - add support for egress DSCP rewrite - IS0 VCAP support (Ingress Classification) - IS2 VCAP filters (protos, L3 addrs, L4 ports, flags, ToS etc.) - ES2 VCAP support (Egress Access Control) - support for Per-Stream Filtering and Policing (802.1Q, 8.6.5.1) - Ethernet embedded switches: - Marvell (mv88e6xxx): - add MAB (port auth) offload support - enable PTP receive for mv88e6390 - NXP (ocelot): - support MAC Merge layer - support for the the vsc7512 internal copper phys - Microchip: - lan9303: convert to PHYLINK - lan966x: support TC flower filter statistics - lan937x: PTP support for KSZ9563/KSZ8563 and LAN937x - lan937x: support Credit Based Shaper configuration - ksz9477: support Energy Efficient Ethernet - other: - qca8k: convert to regmap read/write API, use bulk operations - rswitch: Improve TX timestamp accuracy - Intel WiFi (iwlwifi): - EHT (Wi-Fi 7) rate reporting - STEP equalizer support: transfer some STEP (connection to radio on platforms with integrated wifi) related parameters from the BIOS to the firmware. - Qualcomm 802.11ax WiFi (ath11k): - IPQ5018 support - Fine Timing Measurement (FTM) responder role support - channel 177 support - MediaTek WiFi (mt76): - per-PHY LED support - mt7996: EHT (Wi-Fi 7) support - Wireless Ethernet Dispatch (WED) reset support - switch to using page pool allocator - RealTek WiFi (rtw89): - support new version of Bluetooth co-existance - Mobile: - rmnet: support TX aggregation" * tag 'net-next-6.3' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next: (1872 commits) page_pool: add a comment explaining the fragment counter usage net: ethtool: fix __ethtool_dev_mm_supported() implementation ethtool: pse-pd: Fix double word in comments xsk: add linux/vmalloc.h to xsk.c sefltests: netdevsim: wait for devlink instance after netns removal selftest: fib_tests: Always cleanup before exit net/mlx5e: Align IPsec ASO result memory to be as required by hardware net/mlx5e: TC, Set CT miss to the specific ct action instance net/mlx5e: Rename CHAIN_TO_REG to MAPPED_OBJ_TO_REG net/mlx5: Refactor tc miss handling to a single function net/mlx5: Kconfig: Make tc offload depend on tc skb extension net/sched: flower: Support hardware miss to tc action net/sched: flower: Move filter handle initialization earlier net/sched: cls_api: Support hardware miss to tc action net/sched: Rename user cookie and act cookie sfc: fix builds without CONFIG_RTC_LIB sfc: clean up some inconsistent indentings net/mlx4_en: Introduce flexible array to silence overflow warning net: lan966x: Fix possible deadlock inside PTP net/ulp: Remove redundant ->clone() test in inet_clone_ulp(). ... --- drivers/spi/spi-qcom-qspi.c | 663 ++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 663 insertions(+) create mode 100644 drivers/spi/spi-qcom-qspi.c (limited to 'drivers/spi/spi-qcom-qspi.c') diff --git a/drivers/spi/spi-qcom-qspi.c b/drivers/spi/spi-qcom-qspi.c new file mode 100644 index 000000000..c334dfec4 --- /dev/null +++ b/drivers/spi/spi-qcom-qspi.c @@ -0,0 +1,663 @@ +// SPDX-License-Identifier: GPL-2.0 +// Copyright (c) 2017-2018, The Linux foundation. All rights reserved. + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + + +#define QSPI_NUM_CS 2 +#define QSPI_BYTES_PER_WORD 4 + +#define MSTR_CONFIG 0x0000 +#define FULL_CYCLE_MODE BIT(3) +#define FB_CLK_EN BIT(4) +#define PIN_HOLDN BIT(6) +#define PIN_WPN BIT(7) +#define DMA_ENABLE BIT(8) +#define BIG_ENDIAN_MODE BIT(9) +#define SPI_MODE_MSK 0xc00 +#define SPI_MODE_SHFT 10 +#define CHIP_SELECT_NUM BIT(12) +#define SBL_EN BIT(13) +#define LPA_BASE_MSK 0x3c000 +#define LPA_BASE_SHFT 14 +#define TX_DATA_DELAY_MSK 0xc0000 +#define TX_DATA_DELAY_SHFT 18 +#define TX_CLK_DELAY_MSK 0x300000 +#define TX_CLK_DELAY_SHFT 20 +#define TX_CS_N_DELAY_MSK 0xc00000 +#define TX_CS_N_DELAY_SHFT 22 +#define TX_DATA_OE_DELAY_MSK 0x3000000 +#define TX_DATA_OE_DELAY_SHFT 24 + +#define AHB_MASTER_CFG 0x0004 +#define HMEM_TYPE_START_MID_TRANS_MSK 0x7 +#define HMEM_TYPE_START_MID_TRANS_SHFT 0 +#define HMEM_TYPE_LAST_TRANS_MSK 0x38 +#define HMEM_TYPE_LAST_TRANS_SHFT 3 +#define USE_HMEMTYPE_LAST_ON_DESC_OR_CHAIN_MSK 0xc0 +#define USE_HMEMTYPE_LAST_ON_DESC_OR_CHAIN_SHFT 6 +#define HMEMTYPE_READ_TRANS_MSK 0x700 +#define HMEMTYPE_READ_TRANS_SHFT 8 +#define HSHARED BIT(11) +#define HINNERSHARED BIT(12) + +#define MSTR_INT_EN 0x000C +#define MSTR_INT_STATUS 0x0010 +#define RESP_FIFO_UNDERRUN BIT(0) +#define RESP_FIFO_NOT_EMPTY BIT(1) +#define RESP_FIFO_RDY BIT(2) +#define HRESP_FROM_NOC_ERR BIT(3) +#define WR_FIFO_EMPTY BIT(9) +#define WR_FIFO_FULL BIT(10) +#define WR_FIFO_OVERRUN BIT(11) +#define TRANSACTION_DONE BIT(16) +#define QSPI_ERR_IRQS (RESP_FIFO_UNDERRUN | HRESP_FROM_NOC_ERR | \ + WR_FIFO_OVERRUN) +#define QSPI_ALL_IRQS (QSPI_ERR_IRQS | RESP_FIFO_RDY | \ + WR_FIFO_EMPTY | WR_FIFO_FULL | \ + TRANSACTION_DONE) + +#define PIO_XFER_CTRL 0x0014 +#define REQUEST_COUNT_MSK 0xffff + +#define PIO_XFER_CFG 0x0018 +#define TRANSFER_DIRECTION BIT(0) +#define MULTI_IO_MODE_MSK 0xe +#define MULTI_IO_MODE_SHFT 1 +#define TRANSFER_FRAGMENT BIT(8) +#define SDR_1BIT 1 +#define SDR_2BIT 2 +#define SDR_4BIT 3 +#define DDR_1BIT 5 +#define DDR_2BIT 6 +#define DDR_4BIT 7 +#define DMA_DESC_SINGLE_SPI 1 +#define DMA_DESC_DUAL_SPI 2 +#define DMA_DESC_QUAD_SPI 3 + +#define PIO_XFER_STATUS 0x001c +#define WR_FIFO_BYTES_MSK 0xffff0000 +#define WR_FIFO_BYTES_SHFT 16 + +#define PIO_DATAOUT_1B 0x0020 +#define PIO_DATAOUT_4B 0x0024 + +#define RD_FIFO_CFG 0x0028 +#define CONTINUOUS_MODE BIT(0) + +#define RD_FIFO_STATUS 0x002c +#define FIFO_EMPTY BIT(11) +#define WR_CNTS_MSK 0x7f0 +#define WR_CNTS_SHFT 4 +#define RDY_64BYTE BIT(3) +#define RDY_32BYTE BIT(2) +#define RDY_16BYTE BIT(1) +#define FIFO_RDY BIT(0) + +#define RD_FIFO_RESET 0x0030 +#define RESET_FIFO BIT(0) + +#define CUR_MEM_ADDR 0x0048 +#define HW_VERSION 0x004c +#define RD_FIFO 0x0050 +#define SAMPLING_CLK_CFG 0x0090 +#define SAMPLING_CLK_STATUS 0x0094 + + +enum qspi_dir { + QSPI_READ, + QSPI_WRITE, +}; + +struct qspi_xfer { + union { + const void *tx_buf; + void *rx_buf; + }; + unsigned int rem_bytes; + unsigned int buswidth; + enum qspi_dir dir; + bool is_last; +}; + +enum qspi_clocks { + QSPI_CLK_CORE, + QSPI_CLK_IFACE, + QSPI_NUM_CLKS +}; + +struct qcom_qspi { + void __iomem *base; + struct device *dev; + struct clk_bulk_data *clks; + struct qspi_xfer xfer; + struct icc_path *icc_path_cpu_to_qspi; + unsigned long last_speed; + /* Lock to protect data accessed by IRQs */ + spinlock_t lock; +}; + +static u32 qspi_buswidth_to_iomode(struct qcom_qspi *ctrl, + unsigned int buswidth) +{ + switch (buswidth) { + case 1: + return SDR_1BIT << MULTI_IO_MODE_SHFT; + case 2: + return SDR_2BIT << MULTI_IO_MODE_SHFT; + case 4: + return SDR_4BIT << MULTI_IO_MODE_SHFT; + default: + dev_warn_once(ctrl->dev, + "Unexpected bus width: %u\n", buswidth); + return SDR_1BIT << MULTI_IO_MODE_SHFT; + } +} + +static void qcom_qspi_pio_xfer_cfg(struct qcom_qspi *ctrl) +{ + u32 pio_xfer_cfg; + const struct qspi_xfer *xfer; + + xfer = &ctrl->xfer; + pio_xfer_cfg = readl(ctrl->base + PIO_XFER_CFG); + pio_xfer_cfg &= ~TRANSFER_DIRECTION; + pio_xfer_cfg |= xfer->dir; + if (xfer->is_last) + pio_xfer_cfg &= ~TRANSFER_FRAGMENT; + else + pio_xfer_cfg |= TRANSFER_FRAGMENT; + pio_xfer_cfg &= ~MULTI_IO_MODE_MSK; + pio_xfer_cfg |= qspi_buswidth_to_iomode(ctrl, xfer->buswidth); + + writel(pio_xfer_cfg, ctrl->base + PIO_XFER_CFG); +} + +static void qcom_qspi_pio_xfer_ctrl(struct qcom_qspi *ctrl) +{ + u32 pio_xfer_ctrl; + + pio_xfer_ctrl = readl(ctrl->base + PIO_XFER_CTRL); + pio_xfer_ctrl &= ~REQUEST_COUNT_MSK; + pio_xfer_ctrl |= ctrl->xfer.rem_bytes; + writel(pio_xfer_ctrl, ctrl->base + PIO_XFER_CTRL); +} + +static void qcom_qspi_pio_xfer(struct qcom_qspi *ctrl) +{ + u32 ints; + + qcom_qspi_pio_xfer_cfg(ctrl); + + /* Ack any previous interrupts that might be hanging around */ + writel(QSPI_ALL_IRQS, ctrl->base + MSTR_INT_STATUS); + + /* Setup new interrupts */ + if (ctrl->xfer.dir == QSPI_WRITE) + ints = QSPI_ERR_IRQS | WR_FIFO_EMPTY; + else + ints = QSPI_ERR_IRQS | RESP_FIFO_RDY; + writel(ints, ctrl->base + MSTR_INT_EN); + + /* Kick off the transfer */ + qcom_qspi_pio_xfer_ctrl(ctrl); +} + +static void qcom_qspi_handle_err(struct spi_master *master, + struct spi_message *msg) +{ + struct qcom_qspi *ctrl = spi_master_get_devdata(master); + unsigned long flags; + + spin_lock_irqsave(&ctrl->lock, flags); + writel(0, ctrl->base + MSTR_INT_EN); + ctrl->xfer.rem_bytes = 0; + spin_unlock_irqrestore(&ctrl->lock, flags); +} + +static int qcom_qspi_set_speed(struct qcom_qspi *ctrl, unsigned long speed_hz) +{ + int ret; + unsigned int avg_bw_cpu; + + if (speed_hz == ctrl->last_speed) + return 0; + + /* In regular operation (SBL_EN=1) core must be 4x transfer clock */ + ret = dev_pm_opp_set_rate(ctrl->dev, speed_hz * 4); + if (ret) { + dev_err(ctrl->dev, "Failed to set core clk %d\n", ret); + return ret; + } + + /* + * Set BW quota for CPU as driver supports FIFO mode only. + * We don't have explicit peak requirement so keep it equal to avg_bw. + */ + avg_bw_cpu = Bps_to_icc(speed_hz); + ret = icc_set_bw(ctrl->icc_path_cpu_to_qspi, avg_bw_cpu, avg_bw_cpu); + if (ret) { + dev_err(ctrl->dev, "%s: ICC BW voting failed for cpu: %d\n", + __func__, ret); + return ret; + } + + ctrl->last_speed = speed_hz; + + return 0; +} + +static int qcom_qspi_transfer_one(struct spi_master *master, + struct spi_device *slv, + struct spi_transfer *xfer) +{ + struct qcom_qspi *ctrl = spi_master_get_devdata(master); + int ret; + unsigned long speed_hz; + unsigned long flags; + + speed_hz = slv->max_speed_hz; + if (xfer->speed_hz) + speed_hz = xfer->speed_hz; + + ret = qcom_qspi_set_speed(ctrl, speed_hz); + if (ret) + return ret; + + spin_lock_irqsave(&ctrl->lock, flags); + + /* We are half duplex, so either rx or tx will be set */ + if (xfer->rx_buf) { + ctrl->xfer.dir = QSPI_READ; + ctrl->xfer.buswidth = xfer->rx_nbits; + ctrl->xfer.rx_buf = xfer->rx_buf; + } else { + ctrl->xfer.dir = QSPI_WRITE; + ctrl->xfer.buswidth = xfer->tx_nbits; + ctrl->xfer.tx_buf = xfer->tx_buf; + } + ctrl->xfer.is_last = list_is_last(&xfer->transfer_list, + &master->cur_msg->transfers); + ctrl->xfer.rem_bytes = xfer->len; + qcom_qspi_pio_xfer(ctrl); + + spin_unlock_irqrestore(&ctrl->lock, flags); + + /* We'll call spi_finalize_current_transfer() when done */ + return 1; +} + +static int qcom_qspi_prepare_message(struct spi_master *master, + struct spi_message *message) +{ + u32 mstr_cfg; + struct qcom_qspi *ctrl; + int tx_data_oe_delay = 1; + int tx_data_delay = 1; + unsigned long flags; + + ctrl = spi_master_get_devdata(master); + spin_lock_irqsave(&ctrl->lock, flags); + + mstr_cfg = readl(ctrl->base + MSTR_CONFIG); + mstr_cfg &= ~CHIP_SELECT_NUM; + if (message->spi->chip_select) + mstr_cfg |= CHIP_SELECT_NUM; + + mstr_cfg |= FB_CLK_EN | PIN_WPN | PIN_HOLDN | SBL_EN | FULL_CYCLE_MODE; + mstr_cfg &= ~(SPI_MODE_MSK | TX_DATA_OE_DELAY_MSK | TX_DATA_DELAY_MSK); + mstr_cfg |= message->spi->mode << SPI_MODE_SHFT; + mstr_cfg |= tx_data_oe_delay << TX_DATA_OE_DELAY_SHFT; + mstr_cfg |= tx_data_delay << TX_DATA_DELAY_SHFT; + mstr_cfg &= ~DMA_ENABLE; + + writel(mstr_cfg, ctrl->base + MSTR_CONFIG); + spin_unlock_irqrestore(&ctrl->lock, flags); + + return 0; +} + +static irqreturn_t pio_read(struct qcom_qspi *ctrl) +{ + u32 rd_fifo_status; + u32 rd_fifo; + unsigned int wr_cnts; + unsigned int bytes_to_read; + unsigned int words_to_read; + u32 *word_buf; + u8 *byte_buf; + int i; + + rd_fifo_status = readl(ctrl->base + RD_FIFO_STATUS); + + if (!(rd_fifo_status & FIFO_RDY)) { + dev_dbg(ctrl->dev, "Spurious IRQ %#x\n", rd_fifo_status); + return IRQ_NONE; + } + + wr_cnts = (rd_fifo_status & WR_CNTS_MSK) >> WR_CNTS_SHFT; + wr_cnts = min(wr_cnts, ctrl->xfer.rem_bytes); + + words_to_read = wr_cnts / QSPI_BYTES_PER_WORD; + bytes_to_read = wr_cnts % QSPI_BYTES_PER_WORD; + + if (words_to_read) { + word_buf = ctrl->xfer.rx_buf; + ctrl->xfer.rem_bytes -= words_to_read * QSPI_BYTES_PER_WORD; + ioread32_rep(ctrl->base + RD_FIFO, word_buf, words_to_read); + ctrl->xfer.rx_buf = word_buf + words_to_read; + } + + if (bytes_to_read) { + byte_buf = ctrl->xfer.rx_buf; + rd_fifo = readl(ctrl->base + RD_FIFO); + ctrl->xfer.rem_bytes -= bytes_to_read; + for (i = 0; i < bytes_to_read; i++) + *byte_buf++ = rd_fifo >> (i * BITS_PER_BYTE); + ctrl->xfer.rx_buf = byte_buf; + } + + return IRQ_HANDLED; +} + +static irqreturn_t pio_write(struct qcom_qspi *ctrl) +{ + const void *xfer_buf = ctrl->xfer.tx_buf; + const int *word_buf; + const char *byte_buf; + unsigned int wr_fifo_bytes; + unsigned int wr_fifo_words; + unsigned int wr_size; + unsigned int rem_words; + + wr_fifo_bytes = readl(ctrl->base + PIO_XFER_STATUS); + wr_fifo_bytes >>= WR_FIFO_BYTES_SHFT; + + if (ctrl->xfer.rem_bytes < QSPI_BYTES_PER_WORD) { + /* Process the last 1-3 bytes */ + wr_size = min(wr_fifo_bytes, ctrl->xfer.rem_bytes); + ctrl->xfer.rem_bytes -= wr_size; + + byte_buf = xfer_buf; + while (wr_size--) + writel(*byte_buf++, + ctrl->base + PIO_DATAOUT_1B); + ctrl->xfer.tx_buf = byte_buf; + } else { + /* + * Process all the whole words; to keep things simple we'll + * just wait for the next interrupt to handle the last 1-3 + * bytes if we don't have an even number of words. + */ + rem_words = ctrl->xfer.rem_bytes / QSPI_BYTES_PER_WORD; + wr_fifo_words = wr_fifo_bytes / QSPI_BYTES_PER_WORD; + + wr_size = min(rem_words, wr_fifo_words); + ctrl->xfer.rem_bytes -= wr_size * QSPI_BYTES_PER_WORD; + + word_buf = xfer_buf; + iowrite32_rep(ctrl->base + PIO_DATAOUT_4B, word_buf, wr_size); + ctrl->xfer.tx_buf = word_buf + wr_size; + + } + + return IRQ_HANDLED; +} + +static irqreturn_t qcom_qspi_irq(int irq, void *dev_id) +{ + u32 int_status; + struct qcom_qspi *ctrl = dev_id; + irqreturn_t ret = IRQ_NONE; + + spin_lock(&ctrl->lock); + + int_status = readl(ctrl->base + MSTR_INT_STATUS); + writel(int_status, ctrl->base + MSTR_INT_STATUS); + + if (ctrl->xfer.dir == QSPI_WRITE) { + if (int_status & WR_FIFO_EMPTY) + ret = pio_write(ctrl); + } else { + if (int_status & RESP_FIFO_RDY) + ret = pio_read(ctrl); + } + + if (int_status & QSPI_ERR_IRQS) { + if (int_status & RESP_FIFO_UNDERRUN) + dev_err(ctrl->dev, "IRQ error: FIFO underrun\n"); + if (int_status & WR_FIFO_OVERRUN) + dev_err(ctrl->dev, "IRQ error: FIFO overrun\n"); + if (int_status & HRESP_FROM_NOC_ERR) + dev_err(ctrl->dev, "IRQ error: NOC response error\n"); + ret = IRQ_HANDLED; + } + + if (!ctrl->xfer.rem_bytes) { + writel(0, ctrl->base + MSTR_INT_EN); + spi_finalize_current_transfer(dev_get_drvdata(ctrl->dev)); + } + + spin_unlock(&ctrl->lock); + return ret; +} + +static int qcom_qspi_probe(struct platform_device *pdev) +{ + int ret; + struct device *dev; + struct spi_master *master; + struct qcom_qspi *ctrl; + + dev = &pdev->dev; + + master = devm_spi_alloc_master(dev, sizeof(*ctrl)); + if (!master) + return -ENOMEM; + + platform_set_drvdata(pdev, master); + + ctrl = spi_master_get_devdata(master); + + spin_lock_init(&ctrl->lock); + ctrl->dev = dev; + ctrl->base = devm_platform_ioremap_resource(pdev, 0); + if (IS_ERR(ctrl->base)) + return PTR_ERR(ctrl->base); + + ctrl->clks = devm_kcalloc(dev, QSPI_NUM_CLKS, + sizeof(*ctrl->clks), GFP_KERNEL); + if (!ctrl->clks) + return -ENOMEM; + + ctrl->clks[QSPI_CLK_CORE].id = "core"; + ctrl->clks[QSPI_CLK_IFACE].id = "iface"; + ret = devm_clk_bulk_get(dev, QSPI_NUM_CLKS, ctrl->clks); + if (ret) + return ret; + + ctrl->icc_path_cpu_to_qspi = devm_of_icc_get(dev, "qspi-config"); + if (IS_ERR(ctrl->icc_path_cpu_to_qspi)) + return dev_err_probe(dev, PTR_ERR(ctrl->icc_path_cpu_to_qspi), + "Failed to get cpu path\n"); + + /* Set BW vote for register access */ + ret = icc_set_bw(ctrl->icc_path_cpu_to_qspi, Bps_to_icc(1000), + Bps_to_icc(1000)); + if (ret) { + dev_err(ctrl->dev, "%s: ICC BW voting failed for cpu: %d\n", + __func__, ret); + return ret; + } + + ret = icc_disable(ctrl->icc_path_cpu_to_qspi); + if (ret) { + dev_err(ctrl->dev, "%s: ICC disable failed for cpu: %d\n", + __func__, ret); + return ret; + } + + ret = platform_get_irq(pdev, 0); + if (ret < 0) + return ret; + ret = devm_request_irq(dev, ret, qcom_qspi_irq, 0, dev_name(dev), ctrl); + if (ret) { + dev_err(dev, "Failed to request irq %d\n", ret); + return ret; + } + + master->max_speed_hz = 300000000; + master->num_chipselect = QSPI_NUM_CS; + master->bus_num = -1; + master->dev.of_node = pdev->dev.of_node; + master->mode_bits = SPI_MODE_0 | + SPI_TX_DUAL | SPI_RX_DUAL | + SPI_TX_QUAD | SPI_RX_QUAD; + master->flags = SPI_MASTER_HALF_DUPLEX; + master->prepare_message = qcom_qspi_prepare_message; + master->transfer_one = qcom_qspi_transfer_one; + master->handle_err = qcom_qspi_handle_err; + master->auto_runtime_pm = true; + + ret = devm_pm_opp_set_clkname(&pdev->dev, "core"); + if (ret) + return ret; + /* OPP table is optional */ + ret = devm_pm_opp_of_add_table(&pdev->dev); + if (ret && ret != -ENODEV) { + dev_err(&pdev->dev, "invalid OPP table in device tree\n"); + return ret; + } + + pm_runtime_use_autosuspend(dev); + pm_runtime_set_autosuspend_delay(dev, 250); + pm_runtime_enable(dev); + + ret = spi_register_master(master); + if (!ret) + return 0; + + pm_runtime_disable(dev); + + return ret; +} + +static int qcom_qspi_remove(struct platform_device *pdev) +{ + struct spi_master *master = platform_get_drvdata(pdev); + + /* Unregister _before_ disabling pm_runtime() so we stop transfers */ + spi_unregister_master(master); + + pm_runtime_disable(&pdev->dev); + + return 0; +} + +static int __maybe_unused qcom_qspi_runtime_suspend(struct device *dev) +{ + struct spi_master *master = dev_get_drvdata(dev); + struct qcom_qspi *ctrl = spi_master_get_devdata(master); + int ret; + + /* Drop the performance state vote */ + dev_pm_opp_set_rate(dev, 0); + clk_bulk_disable_unprepare(QSPI_NUM_CLKS, ctrl->clks); + + ret = icc_disable(ctrl->icc_path_cpu_to_qspi); + if (ret) { + dev_err_ratelimited(ctrl->dev, "%s: ICC disable failed for cpu: %d\n", + __func__, ret); + return ret; + } + + return 0; +} + +static int __maybe_unused qcom_qspi_runtime_resume(struct device *dev) +{ + struct spi_master *master = dev_get_drvdata(dev); + struct qcom_qspi *ctrl = spi_master_get_devdata(master); + int ret; + + ret = icc_enable(ctrl->icc_path_cpu_to_qspi); + if (ret) { + dev_err_ratelimited(ctrl->dev, "%s: ICC enable failed for cpu: %d\n", + __func__, ret); + return ret; + } + + ret = clk_bulk_prepare_enable(QSPI_NUM_CLKS, ctrl->clks); + if (ret) + return ret; + + return dev_pm_opp_set_rate(dev, ctrl->last_speed * 4); +} + +static int __maybe_unused qcom_qspi_suspend(struct device *dev) +{ + struct spi_master *master = dev_get_drvdata(dev); + int ret; + + ret = spi_master_suspend(master); + if (ret) + return ret; + + ret = pm_runtime_force_suspend(dev); + if (ret) + spi_master_resume(master); + + return ret; +} + +static int __maybe_unused qcom_qspi_resume(struct device *dev) +{ + struct spi_master *master = dev_get_drvdata(dev); + int ret; + + ret = pm_runtime_force_resume(dev); + if (ret) + return ret; + + ret = spi_master_resume(master); + if (ret) + pm_runtime_force_suspend(dev); + + return ret; +} + +static const struct dev_pm_ops qcom_qspi_dev_pm_ops = { + SET_RUNTIME_PM_OPS(qcom_qspi_runtime_suspend, + qcom_qspi_runtime_resume, NULL) + SET_SYSTEM_SLEEP_PM_OPS(qcom_qspi_suspend, qcom_qspi_resume) +}; + +static const struct of_device_id qcom_qspi_dt_match[] = { + { .compatible = "qcom,qspi-v1", }, + { } +}; +MODULE_DEVICE_TABLE(of, qcom_qspi_dt_match); + +static struct platform_driver qcom_qspi_driver = { + .driver = { + .name = "qcom_qspi", + .pm = &qcom_qspi_dev_pm_ops, + .of_match_table = qcom_qspi_dt_match, + }, + .probe = qcom_qspi_probe, + .remove = qcom_qspi_remove, +}; +module_platform_driver(qcom_qspi_driver); + +MODULE_DESCRIPTION("SPI driver for QSPI cores"); +MODULE_LICENSE("GPL v2"); -- cgit v1.2.3