| Author | Tokens | Token Proportion | Commits | Commit Proportion |
|---|---|---|---|---|
| Jonas Gorski | 1587 | 54.93% | 18 | 50.00% |
| Florian Fainelli | 1241 | 42.96% | 6 | 16.67% |
| Axel Lin | 11 | 0.38% | 2 | 5.56% |
| Julia Lawall | 11 | 0.38% | 1 | 2.78% |
| Jingoo Han | 10 | 0.35% | 2 | 5.56% |
| Stephen Warren | 9 | 0.31% | 1 | 2.78% |
| Mark Brown | 6 | 0.21% | 1 | 2.78% |
| Geert Uytterhoeven | 5 | 0.17% | 1 | 2.78% |
| Gustavo A. R. Silva | 4 | 0.14% | 1 | 2.78% |
| Aravind Thokala | 2 | 0.07% | 1 | 2.78% |
| Thomas Gleixner | 2 | 0.07% | 1 | 2.78% |
| Arnd Bergmann | 1 | 0.03% | 1 | 2.78% |
| Total | 2889 | 36 |
// SPDX-License-Identifier: GPL-2.0-or-later /* * Broadcom BCM63xx SPI controller support * * Copyright (C) 2009-2012 Florian Fainelli <florian@openwrt.org> * Copyright (C) 2010 Tanguy Bouzeloc <tanguy.bouzeloc@efixo.com> */ #include <linux/kernel.h> #include <linux/clk.h> #include <linux/io.h> #include <linux/module.h> #include <linux/platform_device.h> #include <linux/delay.h> #include <linux/interrupt.h> #include <linux/spi/spi.h> #include <linux/completion.h> #include <linux/err.h> #include <linux/pm_runtime.h> #include <linux/of.h> /* BCM 6338/6348 SPI core */ #define SPI_6348_RSET_SIZE 64 #define SPI_6348_CMD 0x00 /* 16-bits register */ #define SPI_6348_INT_STATUS 0x02 #define SPI_6348_INT_MASK_ST 0x03 #define SPI_6348_INT_MASK 0x04 #define SPI_6348_ST 0x05 #define SPI_6348_CLK_CFG 0x06 #define SPI_6348_FILL_BYTE 0x07 #define SPI_6348_MSG_TAIL 0x09 #define SPI_6348_RX_TAIL 0x0b #define SPI_6348_MSG_CTL 0x40 /* 8-bits register */ #define SPI_6348_MSG_CTL_WIDTH 8 #define SPI_6348_MSG_DATA 0x41 #define SPI_6348_MSG_DATA_SIZE 0x3f #define SPI_6348_RX_DATA 0x80 #define SPI_6348_RX_DATA_SIZE 0x3f /* BCM 3368/6358/6262/6368 SPI core */ #define SPI_6358_RSET_SIZE 1804 #define SPI_6358_MSG_CTL 0x00 /* 16-bits register */ #define SPI_6358_MSG_CTL_WIDTH 16 #define SPI_6358_MSG_DATA 0x02 #define SPI_6358_MSG_DATA_SIZE 0x21e #define SPI_6358_RX_DATA 0x400 #define SPI_6358_RX_DATA_SIZE 0x220 #define SPI_6358_CMD 0x700 /* 16-bits register */ #define SPI_6358_INT_STATUS 0x702 #define SPI_6358_INT_MASK_ST 0x703 #define SPI_6358_INT_MASK 0x704 #define SPI_6358_ST 0x705 #define SPI_6358_CLK_CFG 0x706 #define SPI_6358_FILL_BYTE 0x707 #define SPI_6358_MSG_TAIL 0x709 #define SPI_6358_RX_TAIL 0x70B /* Shared SPI definitions */ /* Message configuration */ #define SPI_FD_RW 0x00 #define SPI_HD_W 0x01 #define SPI_HD_R 0x02 #define SPI_BYTE_CNT_SHIFT 0 #define SPI_6348_MSG_TYPE_SHIFT 6 #define SPI_6358_MSG_TYPE_SHIFT 14 /* Command */ #define SPI_CMD_NOOP 0x00 #define SPI_CMD_SOFT_RESET 0x01 #define SPI_CMD_HARD_RESET 0x02 #define SPI_CMD_START_IMMEDIATE 0x03 #define SPI_CMD_COMMAND_SHIFT 0 #define SPI_CMD_COMMAND_MASK 0x000f #define SPI_CMD_DEVICE_ID_SHIFT 4 #define SPI_CMD_PREPEND_BYTE_CNT_SHIFT 8 #define SPI_CMD_ONE_BYTE_SHIFT 11 #define SPI_CMD_ONE_WIRE_SHIFT 12 #define SPI_DEV_ID_0 0 #define SPI_DEV_ID_1 1 #define SPI_DEV_ID_2 2 #define SPI_DEV_ID_3 3 /* Interrupt mask */ #define SPI_INTR_CMD_DONE 0x01 #define SPI_INTR_RX_OVERFLOW 0x02 #define SPI_INTR_TX_UNDERFLOW 0x04 #define SPI_INTR_TX_OVERFLOW 0x08 #define SPI_INTR_RX_UNDERFLOW 0x10 #define SPI_INTR_CLEAR_ALL 0x1f /* Status */ #define SPI_RX_EMPTY 0x02 #define SPI_CMD_BUSY 0x04 #define SPI_SERIAL_BUSY 0x08 /* Clock configuration */ #define SPI_CLK_20MHZ 0x00 #define SPI_CLK_0_391MHZ 0x01 #define SPI_CLK_0_781MHZ 0x02 /* default */ #define SPI_CLK_1_563MHZ 0x03 #define SPI_CLK_3_125MHZ 0x04 #define SPI_CLK_6_250MHZ 0x05 #define SPI_CLK_12_50MHZ 0x06 #define SPI_CLK_MASK 0x07 #define SPI_SSOFFTIME_MASK 0x38 #define SPI_SSOFFTIME_SHIFT 3 #define SPI_BYTE_SWAP 0x80 enum bcm63xx_regs_spi { SPI_CMD, SPI_INT_STATUS, SPI_INT_MASK_ST, SPI_INT_MASK, SPI_ST, SPI_CLK_CFG, SPI_FILL_BYTE, SPI_MSG_TAIL, SPI_RX_TAIL, SPI_MSG_CTL, SPI_MSG_DATA, SPI_RX_DATA, SPI_MSG_TYPE_SHIFT, SPI_MSG_CTL_WIDTH, SPI_MSG_DATA_SIZE, }; #define BCM63XX_SPI_MAX_PREPEND 15 #define BCM63XX_SPI_MAX_CS 8 #define BCM63XX_SPI_BUS_NUM 0 struct bcm63xx_spi { struct completion done; void __iomem *regs; int irq; /* Platform data */ const unsigned long *reg_offsets; unsigned int fifo_size; unsigned int msg_type_shift; unsigned int msg_ctl_width; /* data iomem */ u8 __iomem *tx_io; const u8 __iomem *rx_io; struct clk *clk; struct platform_device *pdev; }; static inline u8 bcm_spi_readb(struct bcm63xx_spi *bs, unsigned int offset) { return readb(bs->regs + bs->reg_offsets[offset]); } static inline u16 bcm_spi_readw(struct bcm63xx_spi *bs, unsigned int offset) { #ifdef CONFIG_CPU_BIG_ENDIAN return ioread16be(bs->regs + bs->reg_offsets[offset]); #else return readw(bs->regs + bs->reg_offsets[offset]); #endif } static inline void bcm_spi_writeb(struct bcm63xx_spi *bs, u8 value, unsigned int offset) { writeb(value, bs->regs + bs->reg_offsets[offset]); } static inline void bcm_spi_writew(struct bcm63xx_spi *bs, u16 value, unsigned int offset) { #ifdef CONFIG_CPU_BIG_ENDIAN iowrite16be(value, bs->regs + bs->reg_offsets[offset]); #else writew(value, bs->regs + bs->reg_offsets[offset]); #endif } static const unsigned int bcm63xx_spi_freq_table[SPI_CLK_MASK][2] = { { 20000000, SPI_CLK_20MHZ }, { 12500000, SPI_CLK_12_50MHZ }, { 6250000, SPI_CLK_6_250MHZ }, { 3125000, SPI_CLK_3_125MHZ }, { 1563000, SPI_CLK_1_563MHZ }, { 781000, SPI_CLK_0_781MHZ }, { 391000, SPI_CLK_0_391MHZ } }; static void bcm63xx_spi_setup_transfer(struct spi_device *spi, struct spi_transfer *t) { struct bcm63xx_spi *bs = spi_master_get_devdata(spi->master); u8 clk_cfg, reg; int i; /* Default to lowest clock configuration */ clk_cfg = SPI_CLK_0_391MHZ; /* Find the closest clock configuration */ for (i = 0; i < SPI_CLK_MASK; i++) { if (t->speed_hz >= bcm63xx_spi_freq_table[i][0]) { clk_cfg = bcm63xx_spi_freq_table[i][1]; break; } } /* clear existing clock configuration bits of the register */ reg = bcm_spi_readb(bs, SPI_CLK_CFG); reg &= ~SPI_CLK_MASK; reg |= clk_cfg; bcm_spi_writeb(bs, reg, SPI_CLK_CFG); dev_dbg(&spi->dev, "Setting clock register to %02x (hz %d)\n", clk_cfg, t->speed_hz); } /* the spi->mode bits understood by this driver: */ #define MODEBITS (SPI_CPOL | SPI_CPHA) static int bcm63xx_txrx_bufs(struct spi_device *spi, struct spi_transfer *first, unsigned int num_transfers) { struct bcm63xx_spi *bs = spi_master_get_devdata(spi->master); u16 msg_ctl; u16 cmd; unsigned int i, timeout = 0, prepend_len = 0, len = 0; struct spi_transfer *t = first; bool do_rx = false; bool do_tx = false; /* Disable the CMD_DONE interrupt */ bcm_spi_writeb(bs, 0, SPI_INT_MASK); dev_dbg(&spi->dev, "txrx: tx %p, rx %p, len %d\n", t->tx_buf, t->rx_buf, t->len); if (num_transfers > 1 && t->tx_buf && t->len <= BCM63XX_SPI_MAX_PREPEND) prepend_len = t->len; /* prepare the buffer */ for (i = 0; i < num_transfers; i++) { if (t->tx_buf) { do_tx = true; memcpy_toio(bs->tx_io + len, t->tx_buf, t->len); /* don't prepend more than one tx */ if (t != first) prepend_len = 0; } if (t->rx_buf) { do_rx = true; /* prepend is half-duplex write only */ if (t == first) prepend_len = 0; } len += t->len; t = list_entry(t->transfer_list.next, struct spi_transfer, transfer_list); } reinit_completion(&bs->done); /* Fill in the Message control register */ msg_ctl = (len << SPI_BYTE_CNT_SHIFT); if (do_rx && do_tx && prepend_len == 0) msg_ctl |= (SPI_FD_RW << bs->msg_type_shift); else if (do_rx) msg_ctl |= (SPI_HD_R << bs->msg_type_shift); else if (do_tx) msg_ctl |= (SPI_HD_W << bs->msg_type_shift); switch (bs->msg_ctl_width) { case 8: bcm_spi_writeb(bs, msg_ctl, SPI_MSG_CTL); break; case 16: bcm_spi_writew(bs, msg_ctl, SPI_MSG_CTL); break; } /* Issue the transfer */ cmd = SPI_CMD_START_IMMEDIATE; cmd |= (prepend_len << SPI_CMD_PREPEND_BYTE_CNT_SHIFT); cmd |= (spi->chip_select << SPI_CMD_DEVICE_ID_SHIFT); bcm_spi_writew(bs, cmd, SPI_CMD); /* Enable the CMD_DONE interrupt */ bcm_spi_writeb(bs, SPI_INTR_CMD_DONE, SPI_INT_MASK); timeout = wait_for_completion_timeout(&bs->done, HZ); if (!timeout) return -ETIMEDOUT; if (!do_rx) return 0; len = 0; t = first; /* Read out all the data */ for (i = 0; i < num_transfers; i++) { if (t->rx_buf) memcpy_fromio(t->rx_buf, bs->rx_io + len, t->len); if (t != first || prepend_len == 0) len += t->len; t = list_entry(t->transfer_list.next, struct spi_transfer, transfer_list); } return 0; } static int bcm63xx_spi_transfer_one(struct spi_master *master, struct spi_message *m) { struct bcm63xx_spi *bs = spi_master_get_devdata(master); struct spi_transfer *t, *first = NULL; struct spi_device *spi = m->spi; int status = 0; unsigned int n_transfers = 0, total_len = 0; bool can_use_prepend = false; /* * This SPI controller does not support keeping CS active after a * transfer. * Work around this by merging as many transfers we can into one big * full-duplex transfers. */ list_for_each_entry(t, &m->transfers, transfer_list) { if (!first) first = t; n_transfers++; total_len += t->len; if (n_transfers == 2 && !first->rx_buf && !t->tx_buf && first->len <= BCM63XX_SPI_MAX_PREPEND) can_use_prepend = true; else if (can_use_prepend && t->tx_buf) can_use_prepend = false; /* we can only transfer one fifo worth of data */ if ((can_use_prepend && total_len > (bs->fifo_size + BCM63XX_SPI_MAX_PREPEND)) || (!can_use_prepend && total_len > bs->fifo_size)) { dev_err(&spi->dev, "unable to do transfers larger than FIFO size (%i > %i)\n", total_len, bs->fifo_size); status = -EINVAL; goto exit; } /* all combined transfers have to have the same speed */ if (t->speed_hz != first->speed_hz) { dev_err(&spi->dev, "unable to change speed between transfers\n"); status = -EINVAL; goto exit; } /* CS will be deasserted directly after transfer */ if (t->delay_usecs) { dev_err(&spi->dev, "unable to keep CS asserted after transfer\n"); status = -EINVAL; goto exit; } if (t->cs_change || list_is_last(&t->transfer_list, &m->transfers)) { /* configure adapter for a new transfer */ bcm63xx_spi_setup_transfer(spi, first); /* send the data */ status = bcm63xx_txrx_bufs(spi, first, n_transfers); if (status) goto exit; m->actual_length += total_len; first = NULL; n_transfers = 0; total_len = 0; can_use_prepend = false; } } exit: m->status = status; spi_finalize_current_message(master); return 0; } /* This driver supports single master mode only. Hence * CMD_DONE is the only interrupt we care about */ static irqreturn_t bcm63xx_spi_interrupt(int irq, void *dev_id) { struct spi_master *master = (struct spi_master *)dev_id; struct bcm63xx_spi *bs = spi_master_get_devdata(master); u8 intr; /* Read interupts and clear them immediately */ intr = bcm_spi_readb(bs, SPI_INT_STATUS); bcm_spi_writeb(bs, SPI_INTR_CLEAR_ALL, SPI_INT_STATUS); bcm_spi_writeb(bs, 0, SPI_INT_MASK); /* A transfer completed */ if (intr & SPI_INTR_CMD_DONE) complete(&bs->done); return IRQ_HANDLED; } static size_t bcm63xx_spi_max_length(struct spi_device *spi) { struct bcm63xx_spi *bs = spi_master_get_devdata(spi->master); return bs->fifo_size; } static const unsigned long bcm6348_spi_reg_offsets[] = { [SPI_CMD] = SPI_6348_CMD, [SPI_INT_STATUS] = SPI_6348_INT_STATUS, [SPI_INT_MASK_ST] = SPI_6348_INT_MASK_ST, [SPI_INT_MASK] = SPI_6348_INT_MASK, [SPI_ST] = SPI_6348_ST, [SPI_CLK_CFG] = SPI_6348_CLK_CFG, [SPI_FILL_BYTE] = SPI_6348_FILL_BYTE, [SPI_MSG_TAIL] = SPI_6348_MSG_TAIL, [SPI_RX_TAIL] = SPI_6348_RX_TAIL, [SPI_MSG_CTL] = SPI_6348_MSG_CTL, [SPI_MSG_DATA] = SPI_6348_MSG_DATA, [SPI_RX_DATA] = SPI_6348_RX_DATA, [SPI_MSG_TYPE_SHIFT] = SPI_6348_MSG_TYPE_SHIFT, [SPI_MSG_CTL_WIDTH] = SPI_6348_MSG_CTL_WIDTH, [SPI_MSG_DATA_SIZE] = SPI_6348_MSG_DATA_SIZE, }; static const unsigned long bcm6358_spi_reg_offsets[] = { [SPI_CMD] = SPI_6358_CMD, [SPI_INT_STATUS] = SPI_6358_INT_STATUS, [SPI_INT_MASK_ST] = SPI_6358_INT_MASK_ST, [SPI_INT_MASK] = SPI_6358_INT_MASK, [SPI_ST] = SPI_6358_ST, [SPI_CLK_CFG] = SPI_6358_CLK_CFG, [SPI_FILL_BYTE] = SPI_6358_FILL_BYTE, [SPI_MSG_TAIL] = SPI_6358_MSG_TAIL, [SPI_RX_TAIL] = SPI_6358_RX_TAIL, [SPI_MSG_CTL] = SPI_6358_MSG_CTL, [SPI_MSG_DATA] = SPI_6358_MSG_DATA, [SPI_RX_DATA] = SPI_6358_RX_DATA, [SPI_MSG_TYPE_SHIFT] = SPI_6358_MSG_TYPE_SHIFT, [SPI_MSG_CTL_WIDTH] = SPI_6358_MSG_CTL_WIDTH, [SPI_MSG_DATA_SIZE] = SPI_6358_MSG_DATA_SIZE, }; static const struct platform_device_id bcm63xx_spi_dev_match[] = { { .name = "bcm6348-spi", .driver_data = (unsigned long)bcm6348_spi_reg_offsets, }, { .name = "bcm6358-spi", .driver_data = (unsigned long)bcm6358_spi_reg_offsets, }, { }, }; static const struct of_device_id bcm63xx_spi_of_match[] = { { .compatible = "brcm,bcm6348-spi", .data = &bcm6348_spi_reg_offsets }, { .compatible = "brcm,bcm6358-spi", .data = &bcm6358_spi_reg_offsets }, { }, }; static int bcm63xx_spi_probe(struct platform_device *pdev) { struct resource *r; const unsigned long *bcm63xx_spireg; struct device *dev = &pdev->dev; int irq, bus_num; struct spi_master *master; struct clk *clk; struct bcm63xx_spi *bs; int ret; u32 num_cs = BCM63XX_SPI_MAX_CS; if (dev->of_node) { const struct of_device_id *match; match = of_match_node(bcm63xx_spi_of_match, dev->of_node); if (!match) return -EINVAL; bcm63xx_spireg = match->data; of_property_read_u32(dev->of_node, "num-cs", &num_cs); if (num_cs > BCM63XX_SPI_MAX_CS) { dev_warn(dev, "unsupported number of cs (%i), reducing to 8\n", num_cs); num_cs = BCM63XX_SPI_MAX_CS; } bus_num = -1; } else if (pdev->id_entry->driver_data) { const struct platform_device_id *match = pdev->id_entry; bcm63xx_spireg = (const unsigned long *)match->driver_data; bus_num = BCM63XX_SPI_BUS_NUM; } else { return -EINVAL; } irq = platform_get_irq(pdev, 0); if (irq < 0) { dev_err(dev, "no irq: %d\n", irq); return irq; } clk = devm_clk_get(dev, "spi"); if (IS_ERR(clk)) { dev_err(dev, "no clock for device\n"); return PTR_ERR(clk); } master = spi_alloc_master(dev, sizeof(*bs)); if (!master) { dev_err(dev, "out of memory\n"); return -ENOMEM; } bs = spi_master_get_devdata(master); init_completion(&bs->done); platform_set_drvdata(pdev, master); bs->pdev = pdev; r = platform_get_resource(pdev, IORESOURCE_MEM, 0); bs->regs = devm_ioremap_resource(&pdev->dev, r); if (IS_ERR(bs->regs)) { ret = PTR_ERR(bs->regs); goto out_err; } bs->irq = irq; bs->clk = clk; bs->reg_offsets = bcm63xx_spireg; bs->fifo_size = bs->reg_offsets[SPI_MSG_DATA_SIZE]; ret = devm_request_irq(&pdev->dev, irq, bcm63xx_spi_interrupt, 0, pdev->name, master); if (ret) { dev_err(dev, "unable to request irq\n"); goto out_err; } master->dev.of_node = dev->of_node; master->bus_num = bus_num; master->num_chipselect = num_cs; master->transfer_one_message = bcm63xx_spi_transfer_one; master->mode_bits = MODEBITS; master->bits_per_word_mask = SPI_BPW_MASK(8); master->max_transfer_size = bcm63xx_spi_max_length; master->max_message_size = bcm63xx_spi_max_length; master->auto_runtime_pm = true; bs->msg_type_shift = bs->reg_offsets[SPI_MSG_TYPE_SHIFT]; bs->msg_ctl_width = bs->reg_offsets[SPI_MSG_CTL_WIDTH]; bs->tx_io = (u8 *)(bs->regs + bs->reg_offsets[SPI_MSG_DATA]); bs->rx_io = (const u8 *)(bs->regs + bs->reg_offsets[SPI_RX_DATA]); /* Initialize hardware */ ret = clk_prepare_enable(bs->clk); if (ret) goto out_err; bcm_spi_writeb(bs, SPI_INTR_CLEAR_ALL, SPI_INT_STATUS); /* register and we are done */ ret = devm_spi_register_master(dev, master); if (ret) { dev_err(dev, "spi register failed\n"); goto out_clk_disable; } dev_info(dev, "at %pr (irq %d, FIFOs size %d)\n", r, irq, bs->fifo_size); return 0; out_clk_disable: clk_disable_unprepare(clk); out_err: spi_master_put(master); return ret; } static int bcm63xx_spi_remove(struct platform_device *pdev) { struct spi_master *master = platform_get_drvdata(pdev); struct bcm63xx_spi *bs = spi_master_get_devdata(master); /* reset spi block */ bcm_spi_writeb(bs, 0, SPI_INT_MASK); /* HW shutdown */ clk_disable_unprepare(bs->clk); return 0; } #ifdef CONFIG_PM_SLEEP static int bcm63xx_spi_suspend(struct device *dev) { struct spi_master *master = dev_get_drvdata(dev); struct bcm63xx_spi *bs = spi_master_get_devdata(master); spi_master_suspend(master); clk_disable_unprepare(bs->clk); return 0; } static int bcm63xx_spi_resume(struct device *dev) { struct spi_master *master = dev_get_drvdata(dev); struct bcm63xx_spi *bs = spi_master_get_devdata(master); int ret; ret = clk_prepare_enable(bs->clk); if (ret) return ret; spi_master_resume(master); return 0; } #endif static const struct dev_pm_ops bcm63xx_spi_pm_ops = { SET_SYSTEM_SLEEP_PM_OPS(bcm63xx_spi_suspend, bcm63xx_spi_resume) }; static struct platform_driver bcm63xx_spi_driver = { .driver = { .name = "bcm63xx-spi", .pm = &bcm63xx_spi_pm_ops, .of_match_table = bcm63xx_spi_of_match, }, .id_table = bcm63xx_spi_dev_match, .probe = bcm63xx_spi_probe, .remove = bcm63xx_spi_remove, }; module_platform_driver(bcm63xx_spi_driver); MODULE_ALIAS("platform:bcm63xx_spi"); MODULE_AUTHOR("Florian Fainelli <florian@openwrt.org>"); MODULE_AUTHOR("Tanguy Bouzeloc <tanguy.bouzeloc@efixo.com>"); MODULE_DESCRIPTION("Broadcom BCM63xx SPI Controller driver"); MODULE_LICENSE("GPL");
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