| Author | Tokens | Token Proportion | Commits | Commit Proportion |
|---|---|---|---|---|
| Girish Mahadevan | 2500 | 100.00% | 1 | 100.00% |
| Total | 2500 | 1 |
// SPDX-License-Identifier: GPL-2.0 // Copyright (c) 2017-2018, The Linux foundation. All rights reserved. #include <linux/clk.h> #include <linux/interrupt.h> #include <linux/io.h> #include <linux/module.h> #include <linux/of.h> #include <linux/of_platform.h> #include <linux/pm_runtime.h> #include <linux/spi/spi.h> #include <linux/spi/spi-mem.h> #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_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_CFG 0x0028 #define CONTINUOUS_MODE 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[QSPI_NUM_CLKS]; struct qspi_xfer xfer; /* 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_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; /* In regular operation (SBL_EN=1) core must be 4x transfer clock */ ret = clk_set_rate(ctrl->clks[QSPI_CLK_CORE].clk, speed_hz * 4); if (ret) { dev_err(ctrl->dev, "Failed to set core clk %d\n", 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; unsigned long flags; spin_lock_irqsave(&ctrl->lock, flags); 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_irqrestore(&ctrl->lock, flags); return ret; } static int qcom_qspi_probe(struct platform_device *pdev) { int ret; struct device *dev; struct resource *res; struct spi_master *master; struct qcom_qspi *ctrl; dev = &pdev->dev; master = 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; res = platform_get_resource(pdev, IORESOURCE_MEM, 0); ctrl->base = devm_ioremap_resource(dev, res); if (IS_ERR(ctrl->base)) { ret = PTR_ERR(ctrl->base); goto exit_probe_master_put; } 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) goto exit_probe_master_put; ret = platform_get_irq(pdev, 0); if (ret < 0) { dev_err(dev, "Failed to get irq %d\n", ret); goto exit_probe_master_put; } ret = devm_request_irq(dev, ret, qcom_qspi_irq, IRQF_TRIGGER_HIGH, dev_name(dev), ctrl); if (ret) { dev_err(dev, "Failed to request irq %d\n", ret); goto exit_probe_master_put; } 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; pm_runtime_enable(dev); ret = spi_register_master(master); if (!ret) return 0; pm_runtime_disable(dev); exit_probe_master_put: spi_master_put(master); 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); clk_bulk_disable_unprepare(QSPI_NUM_CLKS, ctrl->clks); 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); return clk_bulk_prepare_enable(QSPI_NUM_CLKS, ctrl->clks); } 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");
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