| Author | Tokens | Token Proportion | Commits | Commit Proportion |
|---|---|---|---|---|
| Samuel Ortiz | 2401 | 32.17% | 1 | 0.85% |
| Vignesh R | 591 | 7.92% | 6 | 5.13% |
| Roman Tereshonkov | 485 | 6.50% | 4 | 3.42% |
| Illia Smyrnov | 475 | 6.36% | 3 | 2.56% |
| Russell King | 411 | 5.51% | 4 | 3.42% |
| Shubhrajyoti Datta | 300 | 4.02% | 12 | 10.26% |
| Benoît Cousson | 232 | 3.11% | 2 | 1.71% |
| Tony Lindgren | 232 | 3.11% | 5 | 4.27% |
| Franklin S Cooper Jr | 192 | 2.57% | 2 | 1.71% |
| Stefan Sörensen | 181 | 2.42% | 2 | 1.71% |
| Vaishnav Achath | 181 | 2.42% | 3 | 2.56% |
| Yang Yingliang | 169 | 2.26% | 1 | 0.85% |
| Louis Chauvet | 152 | 2.04% | 1 | 0.85% |
| Eero Nurkkala | 133 | 1.78% | 1 | 0.85% |
| Gregory CLEMENT | 127 | 1.70% | 1 | 0.85% |
| Hemanth V | 106 | 1.42% | 1 | 0.85% |
| Michael Welling | 95 | 1.27% | 5 | 4.27% |
| Tero Kristo | 90 | 1.21% | 1 | 0.85% |
| Govindraj Raja | 74 | 0.99% | 1 | 0.85% |
| Daniel Mack | 72 | 0.96% | 2 | 1.71% |
| Herve Codina via Alsa-devel | 60 | 0.80% | 1 | 0.85% |
| Lukas Wunner | 59 | 0.79% | 1 | 0.85% |
| Aswath Govindraju | 56 | 0.75% | 1 | 0.85% |
| Neil Armstrong | 48 | 0.64% | 1 | 0.85% |
| Peter Ujfalusi | 47 | 0.63% | 1 | 0.85% |
| Sebastian Reichel | 39 | 0.52% | 1 | 0.85% |
| Ilkka Koskinen | 36 | 0.48% | 1 | 0.85% |
| Matt Porter | 35 | 0.47% | 2 | 1.71% |
| Andrea Zanotti | 33 | 0.44% | 1 | 0.85% |
| Mark A. Greer | 31 | 0.42% | 1 | 0.85% |
| Axel Lin | 26 | 0.35% | 2 | 1.71% |
| Jouni Högander | 26 | 0.35% | 2 | 1.71% |
| Varadarajan, Charulatha | 22 | 0.29% | 1 | 0.85% |
| Alexander Sverdlin | 20 | 0.27% | 1 | 0.85% |
| Victor Kamensky | 18 | 0.24% | 1 | 0.85% |
| Akinobu Mita | 17 | 0.23% | 1 | 0.85% |
| Vikram N | 16 | 0.21% | 1 | 0.85% |
| Jingoo Han | 16 | 0.21% | 3 | 2.56% |
| Felipe Balbi | 15 | 0.20% | 3 | 2.56% |
| Michael Jones | 13 | 0.17% | 1 | 0.85% |
| David Brownell | 12 | 0.16% | 2 | 1.71% |
| Pascal Huerst | 11 | 0.15% | 1 | 0.85% |
| Stephen Warren | 10 | 0.13% | 1 | 0.85% |
| Wei Yongjun | 9 | 0.12% | 1 | 0.85% |
| Matthias Brugger | 9 | 0.12% | 1 | 0.85% |
| Jorge A. Ventura | 8 | 0.11% | 1 | 0.85% |
| Hui Wang | 8 | 0.11% | 1 | 0.85% |
| Kalle Valo | 8 | 0.11% | 1 | 0.85% |
| Thierry Reding | 8 | 0.11% | 1 | 0.85% |
| Jarkko Nikula | 6 | 0.08% | 2 | 1.71% |
| Hannu Heikkinen | 5 | 0.07% | 1 | 0.85% |
| Mark Brown | 4 | 0.05% | 2 | 1.71% |
| Linus Walleij | 4 | 0.05% | 1 | 0.85% |
| Kay Sievers | 4 | 0.05% | 1 | 0.85% |
| Li Yang | 4 | 0.05% | 1 | 0.85% |
| Uwe Kleine-König | 3 | 0.04% | 2 | 1.71% |
| Zhiqi Song | 3 | 0.04% | 1 | 0.85% |
| Chi Minghao | 3 | 0.04% | 1 | 0.85% |
| Scott Ellis | 2 | 0.03% | 1 | 0.85% |
| Dan Carpenter | 2 | 0.03% | 1 | 0.85% |
| Linus Torvalds (pre-git) | 2 | 0.03% | 1 | 0.85% |
| Linus Torvalds | 1 | 0.01% | 1 | 0.85% |
| Rob Herring | 1 | 0.01% | 1 | 0.85% |
| Arnd Bergmann | 1 | 0.01% | 1 | 0.85% |
| Mauro Carvalho Chehab | 1 | 0.01% | 1 | 0.85% |
| Joe Perches | 1 | 0.01% | 1 | 0.85% |
| Thomas Gleixner | 1 | 0.01% | 1 | 0.85% |
| Sebastian Andrzej Siewior | 1 | 0.01% | 1 | 0.85% |
| Total | 7464 | 117 |
// SPDX-License-Identifier: GPL-2.0-or-later /* * OMAP2 McSPI controller driver * * Copyright (C) 2005, 2006 Nokia Corporation * Author: Samuel Ortiz <samuel.ortiz@nokia.com> and * Juha Yrjola <juha.yrjola@nokia.com> */ #include <linux/kernel.h> #include <linux/interrupt.h> #include <linux/module.h> #include <linux/device.h> #include <linux/delay.h> #include <linux/dma-mapping.h> #include <linux/dmaengine.h> #include <linux/pinctrl/consumer.h> #include <linux/platform_device.h> #include <linux/err.h> #include <linux/clk.h> #include <linux/io.h> #include <linux/slab.h> #include <linux/pm_runtime.h> #include <linux/of.h> #include <linux/of_device.h> #include <linux/gcd.h> #include <linux/spi/spi.h> #include <linux/platform_data/spi-omap2-mcspi.h> #define OMAP2_MCSPI_MAX_FREQ 48000000 #define OMAP2_MCSPI_MAX_DIVIDER 4096 #define OMAP2_MCSPI_MAX_FIFODEPTH 64 #define OMAP2_MCSPI_MAX_FIFOWCNT 0xFFFF #define SPI_AUTOSUSPEND_TIMEOUT 2000 #define OMAP2_MCSPI_REVISION 0x00 #define OMAP2_MCSPI_SYSSTATUS 0x14 #define OMAP2_MCSPI_IRQSTATUS 0x18 #define OMAP2_MCSPI_IRQENABLE 0x1c #define OMAP2_MCSPI_WAKEUPENABLE 0x20 #define OMAP2_MCSPI_SYST 0x24 #define OMAP2_MCSPI_MODULCTRL 0x28 #define OMAP2_MCSPI_XFERLEVEL 0x7c /* per-channel banks, 0x14 bytes each, first is: */ #define OMAP2_MCSPI_CHCONF0 0x2c #define OMAP2_MCSPI_CHSTAT0 0x30 #define OMAP2_MCSPI_CHCTRL0 0x34 #define OMAP2_MCSPI_TX0 0x38 #define OMAP2_MCSPI_RX0 0x3c /* per-register bitmasks: */ #define OMAP2_MCSPI_IRQSTATUS_EOW BIT(17) #define OMAP2_MCSPI_MODULCTRL_SINGLE BIT(0) #define OMAP2_MCSPI_MODULCTRL_MS BIT(2) #define OMAP2_MCSPI_MODULCTRL_STEST BIT(3) #define OMAP2_MCSPI_CHCONF_PHA BIT(0) #define OMAP2_MCSPI_CHCONF_POL BIT(1) #define OMAP2_MCSPI_CHCONF_CLKD_MASK (0x0f << 2) #define OMAP2_MCSPI_CHCONF_EPOL BIT(6) #define OMAP2_MCSPI_CHCONF_WL_MASK (0x1f << 7) #define OMAP2_MCSPI_CHCONF_TRM_RX_ONLY BIT(12) #define OMAP2_MCSPI_CHCONF_TRM_TX_ONLY BIT(13) #define OMAP2_MCSPI_CHCONF_TRM_MASK (0x03 << 12) #define OMAP2_MCSPI_CHCONF_DMAW BIT(14) #define OMAP2_MCSPI_CHCONF_DMAR BIT(15) #define OMAP2_MCSPI_CHCONF_DPE0 BIT(16) #define OMAP2_MCSPI_CHCONF_DPE1 BIT(17) #define OMAP2_MCSPI_CHCONF_IS BIT(18) #define OMAP2_MCSPI_CHCONF_TURBO BIT(19) #define OMAP2_MCSPI_CHCONF_FORCE BIT(20) #define OMAP2_MCSPI_CHCONF_FFET BIT(27) #define OMAP2_MCSPI_CHCONF_FFER BIT(28) #define OMAP2_MCSPI_CHCONF_CLKG BIT(29) #define OMAP2_MCSPI_CHSTAT_RXS BIT(0) #define OMAP2_MCSPI_CHSTAT_TXS BIT(1) #define OMAP2_MCSPI_CHSTAT_EOT BIT(2) #define OMAP2_MCSPI_CHSTAT_TXFFE BIT(3) #define OMAP2_MCSPI_CHCTRL_EN BIT(0) #define OMAP2_MCSPI_CHCTRL_EXTCLK_MASK (0xff << 8) #define OMAP2_MCSPI_WAKEUPENABLE_WKEN BIT(0) /* We have 2 DMA channels per CS, one for RX and one for TX */ struct omap2_mcspi_dma { struct dma_chan *dma_tx; struct dma_chan *dma_rx; struct completion dma_tx_completion; struct completion dma_rx_completion; char dma_rx_ch_name[14]; char dma_tx_ch_name[14]; }; /* use PIO for small transfers, avoiding DMA setup/teardown overhead and * cache operations; better heuristics consider wordsize and bitrate. */ #define DMA_MIN_BYTES 160 /* * Used for context save and restore, structure members to be updated whenever * corresponding registers are modified. */ struct omap2_mcspi_regs { u32 modulctrl; u32 wakeupenable; struct list_head cs; }; struct omap2_mcspi { struct completion txdone; struct spi_controller *ctlr; /* Virtual base address of the controller */ void __iomem *base; unsigned long phys; /* SPI1 has 4 channels, while SPI2 has 2 */ struct omap2_mcspi_dma *dma_channels; struct device *dev; struct omap2_mcspi_regs ctx; struct clk *ref_clk; int fifo_depth; bool target_aborted; unsigned int pin_dir:1; size_t max_xfer_len; u32 ref_clk_hz; bool use_multi_mode; }; struct omap2_mcspi_cs { void __iomem *base; unsigned long phys; int word_len; u16 mode; struct list_head node; /* Context save and restore shadow register */ u32 chconf0, chctrl0; }; static inline void mcspi_write_reg(struct spi_controller *ctlr, int idx, u32 val) { struct omap2_mcspi *mcspi = spi_controller_get_devdata(ctlr); writel_relaxed(val, mcspi->base + idx); } static inline u32 mcspi_read_reg(struct spi_controller *ctlr, int idx) { struct omap2_mcspi *mcspi = spi_controller_get_devdata(ctlr); return readl_relaxed(mcspi->base + idx); } static inline void mcspi_write_cs_reg(const struct spi_device *spi, int idx, u32 val) { struct omap2_mcspi_cs *cs = spi->controller_state; writel_relaxed(val, cs->base + idx); } static inline u32 mcspi_read_cs_reg(const struct spi_device *spi, int idx) { struct omap2_mcspi_cs *cs = spi->controller_state; return readl_relaxed(cs->base + idx); } static inline u32 mcspi_cached_chconf0(const struct spi_device *spi) { struct omap2_mcspi_cs *cs = spi->controller_state; return cs->chconf0; } static inline void mcspi_write_chconf0(const struct spi_device *spi, u32 val) { struct omap2_mcspi_cs *cs = spi->controller_state; cs->chconf0 = val; mcspi_write_cs_reg(spi, OMAP2_MCSPI_CHCONF0, val); mcspi_read_cs_reg(spi, OMAP2_MCSPI_CHCONF0); } static inline int mcspi_bytes_per_word(int word_len) { if (word_len <= 8) return 1; else if (word_len <= 16) return 2; else /* word_len <= 32 */ return 4; } static void omap2_mcspi_set_dma_req(const struct spi_device *spi, int is_read, int enable) { u32 l, rw; l = mcspi_cached_chconf0(spi); if (is_read) /* 1 is read, 0 write */ rw = OMAP2_MCSPI_CHCONF_DMAR; else rw = OMAP2_MCSPI_CHCONF_DMAW; if (enable) l |= rw; else l &= ~rw; mcspi_write_chconf0(spi, l); } static void omap2_mcspi_set_enable(const struct spi_device *spi, int enable) { struct omap2_mcspi_cs *cs = spi->controller_state; u32 l; l = cs->chctrl0; if (enable) l |= OMAP2_MCSPI_CHCTRL_EN; else l &= ~OMAP2_MCSPI_CHCTRL_EN; cs->chctrl0 = l; mcspi_write_cs_reg(spi, OMAP2_MCSPI_CHCTRL0, cs->chctrl0); /* Flash post-writes */ mcspi_read_cs_reg(spi, OMAP2_MCSPI_CHCTRL0); } static void omap2_mcspi_set_cs(struct spi_device *spi, bool enable) { struct omap2_mcspi *mcspi = spi_controller_get_devdata(spi->controller); u32 l; /* The controller handles the inverted chip selects * using the OMAP2_MCSPI_CHCONF_EPOL bit so revert * the inversion from the core spi_set_cs function. */ if (spi->mode & SPI_CS_HIGH) enable = !enable; if (spi->controller_state) { int err = pm_runtime_resume_and_get(mcspi->dev); if (err < 0) { dev_err(mcspi->dev, "failed to get sync: %d\n", err); return; } l = mcspi_cached_chconf0(spi); /* Only enable chip select manually if single mode is used */ if (mcspi->use_multi_mode) { l &= ~OMAP2_MCSPI_CHCONF_FORCE; } else { if (enable) l &= ~OMAP2_MCSPI_CHCONF_FORCE; else l |= OMAP2_MCSPI_CHCONF_FORCE; } mcspi_write_chconf0(spi, l); pm_runtime_mark_last_busy(mcspi->dev); pm_runtime_put_autosuspend(mcspi->dev); } } static void omap2_mcspi_set_mode(struct spi_controller *ctlr) { struct omap2_mcspi *mcspi = spi_controller_get_devdata(ctlr); struct omap2_mcspi_regs *ctx = &mcspi->ctx; u32 l; /* * Choose host or target mode */ l = mcspi_read_reg(ctlr, OMAP2_MCSPI_MODULCTRL); l &= ~(OMAP2_MCSPI_MODULCTRL_STEST); if (spi_controller_is_target(ctlr)) { l |= (OMAP2_MCSPI_MODULCTRL_MS); } else { l &= ~(OMAP2_MCSPI_MODULCTRL_MS); /* Enable single mode if needed */ if (mcspi->use_multi_mode) l &= ~OMAP2_MCSPI_MODULCTRL_SINGLE; else l |= OMAP2_MCSPI_MODULCTRL_SINGLE; } mcspi_write_reg(ctlr, OMAP2_MCSPI_MODULCTRL, l); ctx->modulctrl = l; } static void omap2_mcspi_set_fifo(const struct spi_device *spi, struct spi_transfer *t, int enable) { struct spi_controller *ctlr = spi->controller; struct omap2_mcspi_cs *cs = spi->controller_state; struct omap2_mcspi *mcspi; unsigned int wcnt; int max_fifo_depth, bytes_per_word; u32 chconf, xferlevel; mcspi = spi_controller_get_devdata(ctlr); chconf = mcspi_cached_chconf0(spi); if (enable) { bytes_per_word = mcspi_bytes_per_word(cs->word_len); if (t->len % bytes_per_word != 0) goto disable_fifo; if (t->rx_buf != NULL && t->tx_buf != NULL) max_fifo_depth = OMAP2_MCSPI_MAX_FIFODEPTH / 2; else max_fifo_depth = OMAP2_MCSPI_MAX_FIFODEPTH; wcnt = t->len / bytes_per_word; if (wcnt > OMAP2_MCSPI_MAX_FIFOWCNT) goto disable_fifo; xferlevel = wcnt << 16; if (t->rx_buf != NULL) { chconf |= OMAP2_MCSPI_CHCONF_FFER; xferlevel |= (bytes_per_word - 1) << 8; } if (t->tx_buf != NULL) { chconf |= OMAP2_MCSPI_CHCONF_FFET; xferlevel |= bytes_per_word - 1; } mcspi_write_reg(ctlr, OMAP2_MCSPI_XFERLEVEL, xferlevel); mcspi_write_chconf0(spi, chconf); mcspi->fifo_depth = max_fifo_depth; return; } disable_fifo: if (t->rx_buf != NULL) chconf &= ~OMAP2_MCSPI_CHCONF_FFER; if (t->tx_buf != NULL) chconf &= ~OMAP2_MCSPI_CHCONF_FFET; mcspi_write_chconf0(spi, chconf); mcspi->fifo_depth = 0; } static int mcspi_wait_for_reg_bit(void __iomem *reg, unsigned long bit) { unsigned long timeout; timeout = jiffies + msecs_to_jiffies(1000); while (!(readl_relaxed(reg) & bit)) { if (time_after(jiffies, timeout)) { if (!(readl_relaxed(reg) & bit)) return -ETIMEDOUT; else return 0; } cpu_relax(); } return 0; } static int mcspi_wait_for_completion(struct omap2_mcspi *mcspi, struct completion *x) { if (spi_controller_is_target(mcspi->ctlr)) { if (wait_for_completion_interruptible(x) || mcspi->target_aborted) return -EINTR; } else { wait_for_completion(x); } return 0; } static void omap2_mcspi_rx_callback(void *data) { struct spi_device *spi = data; struct omap2_mcspi *mcspi = spi_controller_get_devdata(spi->controller); struct omap2_mcspi_dma *mcspi_dma = &mcspi->dma_channels[spi_get_chipselect(spi, 0)]; /* We must disable the DMA RX request */ omap2_mcspi_set_dma_req(spi, 1, 0); complete(&mcspi_dma->dma_rx_completion); } static void omap2_mcspi_tx_callback(void *data) { struct spi_device *spi = data; struct omap2_mcspi *mcspi = spi_controller_get_devdata(spi->controller); struct omap2_mcspi_dma *mcspi_dma = &mcspi->dma_channels[spi_get_chipselect(spi, 0)]; /* We must disable the DMA TX request */ omap2_mcspi_set_dma_req(spi, 0, 0); complete(&mcspi_dma->dma_tx_completion); } static void omap2_mcspi_tx_dma(struct spi_device *spi, struct spi_transfer *xfer, struct dma_slave_config cfg) { struct omap2_mcspi *mcspi; struct omap2_mcspi_dma *mcspi_dma; struct dma_async_tx_descriptor *tx; mcspi = spi_controller_get_devdata(spi->controller); mcspi_dma = &mcspi->dma_channels[spi_get_chipselect(spi, 0)]; dmaengine_slave_config(mcspi_dma->dma_tx, &cfg); tx = dmaengine_prep_slave_sg(mcspi_dma->dma_tx, xfer->tx_sg.sgl, xfer->tx_sg.nents, DMA_MEM_TO_DEV, DMA_PREP_INTERRUPT | DMA_CTRL_ACK); if (tx) { tx->callback = omap2_mcspi_tx_callback; tx->callback_param = spi; dmaengine_submit(tx); } else { /* FIXME: fall back to PIO? */ } dma_async_issue_pending(mcspi_dma->dma_tx); omap2_mcspi_set_dma_req(spi, 0, 1); } static unsigned omap2_mcspi_rx_dma(struct spi_device *spi, struct spi_transfer *xfer, struct dma_slave_config cfg, unsigned es) { struct omap2_mcspi *mcspi; struct omap2_mcspi_dma *mcspi_dma; unsigned int count, transfer_reduction = 0; struct scatterlist *sg_out[2]; int nb_sizes = 0, out_mapped_nents[2], ret, x; size_t sizes[2]; u32 l; int elements = 0; int word_len, element_count; struct omap2_mcspi_cs *cs = spi->controller_state; void __iomem *chstat_reg = cs->base + OMAP2_MCSPI_CHSTAT0; struct dma_async_tx_descriptor *tx; mcspi = spi_controller_get_devdata(spi->controller); mcspi_dma = &mcspi->dma_channels[spi_get_chipselect(spi, 0)]; count = xfer->len; /* * In the "End-of-Transfer Procedure" section for DMA RX in OMAP35x TRM * it mentions reducing DMA transfer length by one element in host * normal mode. */ if (mcspi->fifo_depth == 0) transfer_reduction = es; word_len = cs->word_len; l = mcspi_cached_chconf0(spi); if (word_len <= 8) element_count = count; else if (word_len <= 16) element_count = count >> 1; else /* word_len <= 32 */ element_count = count >> 2; dmaengine_slave_config(mcspi_dma->dma_rx, &cfg); /* * Reduce DMA transfer length by one more if McSPI is * configured in turbo mode. */ if ((l & OMAP2_MCSPI_CHCONF_TURBO) && mcspi->fifo_depth == 0) transfer_reduction += es; if (transfer_reduction) { /* Split sgl into two. The second sgl won't be used. */ sizes[0] = count - transfer_reduction; sizes[1] = transfer_reduction; nb_sizes = 2; } else { /* * Don't bother splitting the sgl. This essentially * clones the original sgl. */ sizes[0] = count; nb_sizes = 1; } ret = sg_split(xfer->rx_sg.sgl, xfer->rx_sg.nents, 0, nb_sizes, sizes, sg_out, out_mapped_nents, GFP_KERNEL); if (ret < 0) { dev_err(&spi->dev, "sg_split failed\n"); return 0; } tx = dmaengine_prep_slave_sg(mcspi_dma->dma_rx, sg_out[0], out_mapped_nents[0], DMA_DEV_TO_MEM, DMA_PREP_INTERRUPT | DMA_CTRL_ACK); if (tx) { tx->callback = omap2_mcspi_rx_callback; tx->callback_param = spi; dmaengine_submit(tx); } else { /* FIXME: fall back to PIO? */ } dma_async_issue_pending(mcspi_dma->dma_rx); omap2_mcspi_set_dma_req(spi, 1, 1); ret = mcspi_wait_for_completion(mcspi, &mcspi_dma->dma_rx_completion); if (ret || mcspi->target_aborted) { dmaengine_terminate_sync(mcspi_dma->dma_rx); omap2_mcspi_set_dma_req(spi, 1, 0); return 0; } for (x = 0; x < nb_sizes; x++) kfree(sg_out[x]); if (mcspi->fifo_depth > 0) return count; /* * Due to the DMA transfer length reduction the missing bytes must * be read manually to receive all of the expected data. */ omap2_mcspi_set_enable(spi, 0); elements = element_count - 1; if (l & OMAP2_MCSPI_CHCONF_TURBO) { elements--; if (!mcspi_wait_for_reg_bit(chstat_reg, OMAP2_MCSPI_CHSTAT_RXS)) { u32 w; w = mcspi_read_cs_reg(spi, OMAP2_MCSPI_RX0); if (word_len <= 8) ((u8 *)xfer->rx_buf)[elements++] = w; else if (word_len <= 16) ((u16 *)xfer->rx_buf)[elements++] = w; else /* word_len <= 32 */ ((u32 *)xfer->rx_buf)[elements++] = w; } else { int bytes_per_word = mcspi_bytes_per_word(word_len); dev_err(&spi->dev, "DMA RX penultimate word empty\n"); count -= (bytes_per_word << 1); omap2_mcspi_set_enable(spi, 1); return count; } } if (!mcspi_wait_for_reg_bit(chstat_reg, OMAP2_MCSPI_CHSTAT_RXS)) { u32 w; w = mcspi_read_cs_reg(spi, OMAP2_MCSPI_RX0); if (word_len <= 8) ((u8 *)xfer->rx_buf)[elements] = w; else if (word_len <= 16) ((u16 *)xfer->rx_buf)[elements] = w; else /* word_len <= 32 */ ((u32 *)xfer->rx_buf)[elements] = w; } else { dev_err(&spi->dev, "DMA RX last word empty\n"); count -= mcspi_bytes_per_word(word_len); } omap2_mcspi_set_enable(spi, 1); return count; } static unsigned omap2_mcspi_txrx_dma(struct spi_device *spi, struct spi_transfer *xfer) { struct omap2_mcspi *mcspi; struct omap2_mcspi_cs *cs = spi->controller_state; struct omap2_mcspi_dma *mcspi_dma; unsigned int count; u8 *rx; const u8 *tx; struct dma_slave_config cfg; enum dma_slave_buswidth width; unsigned es; void __iomem *chstat_reg; void __iomem *irqstat_reg; int wait_res; mcspi = spi_controller_get_devdata(spi->controller); mcspi_dma = &mcspi->dma_channels[spi_get_chipselect(spi, 0)]; if (cs->word_len <= 8) { width = DMA_SLAVE_BUSWIDTH_1_BYTE; es = 1; } else if (cs->word_len <= 16) { width = DMA_SLAVE_BUSWIDTH_2_BYTES; es = 2; } else { width = DMA_SLAVE_BUSWIDTH_4_BYTES; es = 4; } count = xfer->len; memset(&cfg, 0, sizeof(cfg)); cfg.src_addr = cs->phys + OMAP2_MCSPI_RX0; cfg.dst_addr = cs->phys + OMAP2_MCSPI_TX0; cfg.src_addr_width = width; cfg.dst_addr_width = width; cfg.src_maxburst = 1; cfg.dst_maxburst = 1; rx = xfer->rx_buf; tx = xfer->tx_buf; mcspi->target_aborted = false; reinit_completion(&mcspi_dma->dma_tx_completion); reinit_completion(&mcspi_dma->dma_rx_completion); reinit_completion(&mcspi->txdone); if (tx) { /* Enable EOW IRQ to know end of tx in target mode */ if (spi_controller_is_target(spi->controller)) mcspi_write_reg(spi->controller, OMAP2_MCSPI_IRQENABLE, OMAP2_MCSPI_IRQSTATUS_EOW); omap2_mcspi_tx_dma(spi, xfer, cfg); } if (rx != NULL) count = omap2_mcspi_rx_dma(spi, xfer, cfg, es); if (tx != NULL) { int ret; ret = mcspi_wait_for_completion(mcspi, &mcspi_dma->dma_tx_completion); if (ret || mcspi->target_aborted) { dmaengine_terminate_sync(mcspi_dma->dma_tx); omap2_mcspi_set_dma_req(spi, 0, 0); return 0; } if (spi_controller_is_target(mcspi->ctlr)) { ret = mcspi_wait_for_completion(mcspi, &mcspi->txdone); if (ret || mcspi->target_aborted) return 0; } if (mcspi->fifo_depth > 0) { irqstat_reg = mcspi->base + OMAP2_MCSPI_IRQSTATUS; if (mcspi_wait_for_reg_bit(irqstat_reg, OMAP2_MCSPI_IRQSTATUS_EOW) < 0) dev_err(&spi->dev, "EOW timed out\n"); mcspi_write_reg(mcspi->ctlr, OMAP2_MCSPI_IRQSTATUS, OMAP2_MCSPI_IRQSTATUS_EOW); } /* for TX_ONLY mode, be sure all words have shifted out */ if (rx == NULL) { chstat_reg = cs->base + OMAP2_MCSPI_CHSTAT0; if (mcspi->fifo_depth > 0) { wait_res = mcspi_wait_for_reg_bit(chstat_reg, OMAP2_MCSPI_CHSTAT_TXFFE); if (wait_res < 0) dev_err(&spi->dev, "TXFFE timed out\n"); } else { wait_res = mcspi_wait_for_reg_bit(chstat_reg, OMAP2_MCSPI_CHSTAT_TXS); if (wait_res < 0) dev_err(&spi->dev, "TXS timed out\n"); } if (wait_res >= 0 && (mcspi_wait_for_reg_bit(chstat_reg, OMAP2_MCSPI_CHSTAT_EOT) < 0)) dev_err(&spi->dev, "EOT timed out\n"); } } return count; } static unsigned omap2_mcspi_txrx_pio(struct spi_device *spi, struct spi_transfer *xfer) { struct omap2_mcspi_cs *cs = spi->controller_state; unsigned int count, c; u32 l; void __iomem *base = cs->base; void __iomem *tx_reg; void __iomem *rx_reg; void __iomem *chstat_reg; int word_len; count = xfer->len; c = count; word_len = cs->word_len; l = mcspi_cached_chconf0(spi); /* We store the pre-calculated register addresses on stack to speed * up the transfer loop. */ tx_reg = base + OMAP2_MCSPI_TX0; rx_reg = base + OMAP2_MCSPI_RX0; chstat_reg = base + OMAP2_MCSPI_CHSTAT0; if (c < (word_len>>3)) return 0; if (word_len <= 8) { u8 *rx; const u8 *tx; rx = xfer->rx_buf; tx = xfer->tx_buf; do { c -= 1; if (tx != NULL) { if (mcspi_wait_for_reg_bit(chstat_reg, OMAP2_MCSPI_CHSTAT_TXS) < 0) { dev_err(&spi->dev, "TXS timed out\n"); goto out; } dev_vdbg(&spi->dev, "write-%d %02x\n", word_len, *tx); writel_relaxed(*tx++, tx_reg); } if (rx != NULL) { if (mcspi_wait_for_reg_bit(chstat_reg, OMAP2_MCSPI_CHSTAT_RXS) < 0) { dev_err(&spi->dev, "RXS timed out\n"); goto out; } if (c == 1 && tx == NULL && (l & OMAP2_MCSPI_CHCONF_TURBO)) { omap2_mcspi_set_enable(spi, 0); *rx++ = readl_relaxed(rx_reg); dev_vdbg(&spi->dev, "read-%d %02x\n", word_len, *(rx - 1)); if (mcspi_wait_for_reg_bit(chstat_reg, OMAP2_MCSPI_CHSTAT_RXS) < 0) { dev_err(&spi->dev, "RXS timed out\n"); goto out; } c = 0; } else if (c == 0 && tx == NULL) { omap2_mcspi_set_enable(spi, 0); } *rx++ = readl_relaxed(rx_reg); dev_vdbg(&spi->dev, "read-%d %02x\n", word_len, *(rx - 1)); } /* Add word delay between each word */ spi_delay_exec(&xfer->word_delay, xfer); } while (c); } else if (word_len <= 16) { u16 *rx; const u16 *tx; rx = xfer->rx_buf; tx = xfer->tx_buf; do { c -= 2; if (tx != NULL) { if (mcspi_wait_for_reg_bit(chstat_reg, OMAP2_MCSPI_CHSTAT_TXS) < 0) { dev_err(&spi->dev, "TXS timed out\n"); goto out; } dev_vdbg(&spi->dev, "write-%d %04x\n", word_len, *tx); writel_relaxed(*tx++, tx_reg); } if (rx != NULL) { if (mcspi_wait_for_reg_bit(chstat_reg, OMAP2_MCSPI_CHSTAT_RXS) < 0) { dev_err(&spi->dev, "RXS timed out\n"); goto out; } if (c == 2 && tx == NULL && (l & OMAP2_MCSPI_CHCONF_TURBO)) { omap2_mcspi_set_enable(spi, 0); *rx++ = readl_relaxed(rx_reg); dev_vdbg(&spi->dev, "read-%d %04x\n", word_len, *(rx - 1)); if (mcspi_wait_for_reg_bit(chstat_reg, OMAP2_MCSPI_CHSTAT_RXS) < 0) { dev_err(&spi->dev, "RXS timed out\n"); goto out; } c = 0; } else if (c == 0 && tx == NULL) { omap2_mcspi_set_enable(spi, 0); } *rx++ = readl_relaxed(rx_reg); dev_vdbg(&spi->dev, "read-%d %04x\n", word_len, *(rx - 1)); } /* Add word delay between each word */ spi_delay_exec(&xfer->word_delay, xfer); } while (c >= 2); } else if (word_len <= 32) { u32 *rx; const u32 *tx; rx = xfer->rx_buf; tx = xfer->tx_buf; do { c -= 4; if (tx != NULL) { if (mcspi_wait_for_reg_bit(chstat_reg, OMAP2_MCSPI_CHSTAT_TXS) < 0) { dev_err(&spi->dev, "TXS timed out\n"); goto out; } dev_vdbg(&spi->dev, "write-%d %08x\n", word_len, *tx); writel_relaxed(*tx++, tx_reg); } if (rx != NULL) { if (mcspi_wait_for_reg_bit(chstat_reg, OMAP2_MCSPI_CHSTAT_RXS) < 0) { dev_err(&spi->dev, "RXS timed out\n"); goto out; } if (c == 4 && tx == NULL && (l & OMAP2_MCSPI_CHCONF_TURBO)) { omap2_mcspi_set_enable(spi, 0); *rx++ = readl_relaxed(rx_reg); dev_vdbg(&spi->dev, "read-%d %08x\n", word_len, *(rx - 1)); if (mcspi_wait_for_reg_bit(chstat_reg, OMAP2_MCSPI_CHSTAT_RXS) < 0) { dev_err(&spi->dev, "RXS timed out\n"); goto out; } c = 0; } else if (c == 0 && tx == NULL) { omap2_mcspi_set_enable(spi, 0); } *rx++ = readl_relaxed(rx_reg); dev_vdbg(&spi->dev, "read-%d %08x\n", word_len, *(rx - 1)); } /* Add word delay between each word */ spi_delay_exec(&xfer->word_delay, xfer); } while (c >= 4); } /* for TX_ONLY mode, be sure all words have shifted out */ if (xfer->rx_buf == NULL) { if (mcspi_wait_for_reg_bit(chstat_reg, OMAP2_MCSPI_CHSTAT_TXS) < 0) { dev_err(&spi->dev, "TXS timed out\n"); } else if (mcspi_wait_for_reg_bit(chstat_reg, OMAP2_MCSPI_CHSTAT_EOT) < 0) dev_err(&spi->dev, "EOT timed out\n"); /* disable chan to purge rx datas received in TX_ONLY transfer, * otherwise these rx datas will affect the direct following * RX_ONLY transfer. */ omap2_mcspi_set_enable(spi, 0); } out: omap2_mcspi_set_enable(spi, 1); return count - c; } static u32 omap2_mcspi_calc_divisor(u32 speed_hz, u32 ref_clk_hz) { u32 div; for (div = 0; div < 15; div++) if (speed_hz >= (ref_clk_hz >> div)) return div; return 15; } /* called only when no transfer is active to this device */ static int omap2_mcspi_setup_transfer(struct spi_device *spi, struct spi_transfer *t) { struct omap2_mcspi_cs *cs = spi->controller_state; struct omap2_mcspi *mcspi; u32 ref_clk_hz, l = 0, clkd = 0, div, extclk = 0, clkg = 0; u8 word_len = spi->bits_per_word; u32 speed_hz = spi->max_speed_hz; mcspi = spi_controller_get_devdata(spi->controller); if (t != NULL && t->bits_per_word) word_len = t->bits_per_word; cs->word_len = word_len; if (t && t->speed_hz) speed_hz = t->speed_hz; ref_clk_hz = mcspi->ref_clk_hz; speed_hz = min_t(u32, speed_hz, ref_clk_hz); if (speed_hz < (ref_clk_hz / OMAP2_MCSPI_MAX_DIVIDER)) { clkd = omap2_mcspi_calc_divisor(speed_hz, ref_clk_hz); speed_hz = ref_clk_hz >> clkd; clkg = 0; } else { div = (ref_clk_hz + speed_hz - 1) / speed_hz; speed_hz = ref_clk_hz / div; clkd = (div - 1) & 0xf; extclk = (div - 1) >> 4; clkg = OMAP2_MCSPI_CHCONF_CLKG; } l = mcspi_cached_chconf0(spi); /* standard 4-wire host mode: SCK, MOSI/out, MISO/in, nCS * REVISIT: this controller could support SPI_3WIRE mode. */ if (mcspi->pin_dir == MCSPI_PINDIR_D0_IN_D1_OUT) { l &= ~OMAP2_MCSPI_CHCONF_IS; l &= ~OMAP2_MCSPI_CHCONF_DPE1; l |= OMAP2_MCSPI_CHCONF_DPE0; } else { l |= OMAP2_MCSPI_CHCONF_IS; l |= OMAP2_MCSPI_CHCONF_DPE1; l &= ~OMAP2_MCSPI_CHCONF_DPE0; } /* wordlength */ l &= ~OMAP2_MCSPI_CHCONF_WL_MASK; l |= (word_len - 1) << 7; /* set chipselect polarity; manage with FORCE */ if (!(spi->mode & SPI_CS_HIGH)) l |= OMAP2_MCSPI_CHCONF_EPOL; /* active-low; normal */ else l &= ~OMAP2_MCSPI_CHCONF_EPOL; /* set clock divisor */ l &= ~OMAP2_MCSPI_CHCONF_CLKD_MASK; l |= clkd << 2; /* set clock granularity */ l &= ~OMAP2_MCSPI_CHCONF_CLKG; l |= clkg; if (clkg) { cs->chctrl0 &= ~OMAP2_MCSPI_CHCTRL_EXTCLK_MASK; cs->chctrl0 |= extclk << 8; mcspi_write_cs_reg(spi, OMAP2_MCSPI_CHCTRL0, cs->chctrl0); } /* set SPI mode 0..3 */ if (spi->mode & SPI_CPOL) l |= OMAP2_MCSPI_CHCONF_POL; else l &= ~OMAP2_MCSPI_CHCONF_POL; if (spi->mode & SPI_CPHA) l |= OMAP2_MCSPI_CHCONF_PHA; else l &= ~OMAP2_MCSPI_CHCONF_PHA; mcspi_write_chconf0(spi, l); cs->mode = spi->mode; dev_dbg(&spi->dev, "setup: speed %d, sample %s edge, clk %s\n", speed_hz, (spi->mode & SPI_CPHA) ? "trailing" : "leading", (spi->mode & SPI_CPOL) ? "inverted" : "normal"); return 0; } /* * Note that we currently allow DMA only if we get a channel * for both rx and tx. Otherwise we'll do PIO for both rx and tx. */ static int omap2_mcspi_request_dma(struct omap2_mcspi *mcspi, struct omap2_mcspi_dma *mcspi_dma) { int ret = 0; mcspi_dma->dma_rx = dma_request_chan(mcspi->dev, mcspi_dma->dma_rx_ch_name); if (IS_ERR(mcspi_dma->dma_rx)) { ret = PTR_ERR(mcspi_dma->dma_rx); mcspi_dma->dma_rx = NULL; goto no_dma; } mcspi_dma->dma_tx = dma_request_chan(mcspi->dev, mcspi_dma->dma_tx_ch_name); if (IS_ERR(mcspi_dma->dma_tx)) { ret = PTR_ERR(mcspi_dma->dma_tx); mcspi_dma->dma_tx = NULL; dma_release_channel(mcspi_dma->dma_rx); mcspi_dma->dma_rx = NULL; } init_completion(&mcspi_dma->dma_rx_completion); init_completion(&mcspi_dma->dma_tx_completion); no_dma: return ret; } static void omap2_mcspi_release_dma(struct spi_controller *ctlr) { struct omap2_mcspi *mcspi = spi_controller_get_devdata(ctlr); struct omap2_mcspi_dma *mcspi_dma; int i; for (i = 0; i < ctlr->num_chipselect; i++) { mcspi_dma = &mcspi->dma_channels[i]; if (mcspi_dma->dma_rx) { dma_release_channel(mcspi_dma->dma_rx); mcspi_dma->dma_rx = NULL; } if (mcspi_dma->dma_tx) { dma_release_channel(mcspi_dma->dma_tx); mcspi_dma->dma_tx = NULL; } } } static void omap2_mcspi_cleanup(struct spi_device *spi) { struct omap2_mcspi_cs *cs; if (spi->controller_state) { /* Unlink controller state from context save list */ cs = spi->controller_state; list_del(&cs->node); kfree(cs); } } static int omap2_mcspi_setup(struct spi_device *spi) { bool initial_setup = false; int ret; struct omap2_mcspi *mcspi = spi_controller_get_devdata(spi->controller); struct omap2_mcspi_regs *ctx = &mcspi->ctx; struct omap2_mcspi_cs *cs = spi->controller_state; if (!cs) { cs = kzalloc(sizeof(*cs), GFP_KERNEL); if (!cs) return -ENOMEM; cs->base = mcspi->base + spi_get_chipselect(spi, 0) * 0x14; cs->phys = mcspi->phys + spi_get_chipselect(spi, 0) * 0x14; cs->mode = 0; cs->chconf0 = 0; cs->chctrl0 = 0; spi->controller_state = cs; /* Link this to context save list */ list_add_tail(&cs->node, &ctx->cs); initial_setup = true; } ret = pm_runtime_resume_and_get(mcspi->dev); if (ret < 0) { if (initial_setup) omap2_mcspi_cleanup(spi); return ret; } ret = omap2_mcspi_setup_transfer(spi, NULL); if (ret && initial_setup) omap2_mcspi_cleanup(spi); pm_runtime_mark_last_busy(mcspi->dev); pm_runtime_put_autosuspend(mcspi->dev); return ret; } static irqreturn_t omap2_mcspi_irq_handler(int irq, void *data) { struct omap2_mcspi *mcspi = data; u32 irqstat; irqstat = mcspi_read_reg(mcspi->ctlr, OMAP2_MCSPI_IRQSTATUS); if (!irqstat) return IRQ_NONE; /* Disable IRQ and wakeup target xfer task */ mcspi_write_reg(mcspi->ctlr, OMAP2_MCSPI_IRQENABLE, 0); if (irqstat & OMAP2_MCSPI_IRQSTATUS_EOW) complete(&mcspi->txdone); return IRQ_HANDLED; } static int omap2_mcspi_target_abort(struct spi_controller *ctlr) { struct omap2_mcspi *mcspi = spi_controller_get_devdata(ctlr); struct omap2_mcspi_dma *mcspi_dma = mcspi->dma_channels; mcspi->target_aborted = true; complete(&mcspi_dma->dma_rx_completion); complete(&mcspi_dma->dma_tx_completion); complete(&mcspi->txdone); return 0; } static int omap2_mcspi_transfer_one(struct spi_controller *ctlr, struct spi_device *spi, struct spi_transfer *t) { /* We only enable one channel at a time -- the one whose message is * -- although this controller would gladly * arbitrate among multiple channels. This corresponds to "single * channel" host mode. As a side effect, we need to manage the * chipselect with the FORCE bit ... CS != channel enable. */ struct omap2_mcspi *mcspi; struct omap2_mcspi_dma *mcspi_dma; struct omap2_mcspi_cs *cs; struct omap2_mcspi_device_config *cd; int par_override = 0; int status = 0; u32 chconf; mcspi = spi_controller_get_devdata(ctlr); mcspi_dma = mcspi->dma_channels + spi_get_chipselect(spi, 0); cs = spi->controller_state; cd = spi->controller_data; /* * The target driver could have changed spi->mode in which case * it will be different from cs->mode (the current hardware setup). * If so, set par_override (even though its not a parity issue) so * omap2_mcspi_setup_transfer will be called to configure the hardware * with the correct mode on the first iteration of the loop below. */ if (spi->mode != cs->mode) par_override = 1; omap2_mcspi_set_enable(spi, 0); if (spi_get_csgpiod(spi, 0)) omap2_mcspi_set_cs(spi, spi->mode & SPI_CS_HIGH); if (par_override || (t->speed_hz != spi->max_speed_hz) || (t->bits_per_word != spi->bits_per_word)) { par_override = 1; status = omap2_mcspi_setup_transfer(spi, t); if (status < 0) goto out; if (t->speed_hz == spi->max_speed_hz && t->bits_per_word == spi->bits_per_word) par_override = 0; } chconf = mcspi_cached_chconf0(spi); chconf &= ~OMAP2_MCSPI_CHCONF_TRM_MASK; chconf &= ~OMAP2_MCSPI_CHCONF_TURBO; if (t->tx_buf == NULL) chconf |= OMAP2_MCSPI_CHCONF_TRM_RX_ONLY; else if (t->rx_buf == NULL) chconf |= OMAP2_MCSPI_CHCONF_TRM_TX_ONLY; if (cd && cd->turbo_mode && t->tx_buf == NULL) { /* Turbo mode is for more than one word */ if (t->len > ((cs->word_len + 7) >> 3)) chconf |= OMAP2_MCSPI_CHCONF_TURBO; } mcspi_write_chconf0(spi, chconf); if (t->len) { unsigned count; if ((mcspi_dma->dma_rx && mcspi_dma->dma_tx) && ctlr->cur_msg_mapped && ctlr->can_dma(ctlr, spi, t)) omap2_mcspi_set_fifo(spi, t, 1); omap2_mcspi_set_enable(spi, 1); /* RX_ONLY mode needs dummy data in TX reg */ if (t->tx_buf == NULL) writel_relaxed(0, cs->base + OMAP2_MCSPI_TX0); if ((mcspi_dma->dma_rx && mcspi_dma->dma_tx) && ctlr->cur_msg_mapped && ctlr->can_dma(ctlr, spi, t)) count = omap2_mcspi_txrx_dma(spi, t); else count = omap2_mcspi_txrx_pio(spi, t); if (count != t->len) { status = -EIO; goto out; } } omap2_mcspi_set_enable(spi, 0); if (mcspi->fifo_depth > 0) omap2_mcspi_set_fifo(spi, t, 0); out: /* Restore defaults if they were overriden */ if (par_override) { par_override = 0; status = omap2_mcspi_setup_transfer(spi, NULL); } omap2_mcspi_set_enable(spi, 0); if (spi_get_csgpiod(spi, 0)) omap2_mcspi_set_cs(spi, !(spi->mode & SPI_CS_HIGH)); if (mcspi->fifo_depth > 0 && t) omap2_mcspi_set_fifo(spi, t, 0); return status; } static int omap2_mcspi_prepare_message(struct spi_controller *ctlr, struct spi_message *msg) { struct omap2_mcspi *mcspi = spi_controller_get_devdata(ctlr); struct omap2_mcspi_regs *ctx = &mcspi->ctx; struct omap2_mcspi_cs *cs; struct spi_transfer *tr; u8 bits_per_word; /* * The conditions are strict, it is mandatory to check each transfer of the list to see if * multi-mode is applicable. */ mcspi->use_multi_mode = true; list_for_each_entry(tr, &msg->transfers, transfer_list) { if (!tr->bits_per_word) bits_per_word = msg->spi->bits_per_word; else bits_per_word = tr->bits_per_word; /* * Check if this transfer contains only one word; */ if (bits_per_word < 8 && tr->len == 1) { /* multi-mode is applicable, only one word (1..7 bits) */ } else if (bits_per_word >= 8 && tr->len == bits_per_word / 8) { /* multi-mode is applicable, only one word (8..32 bits) */ } else { /* multi-mode is not applicable: more than one word in the transfer */ mcspi->use_multi_mode = false; } /* Check if transfer asks to change the CS status after the transfer */ if (!tr->cs_change) mcspi->use_multi_mode = false; /* * If at least one message is not compatible, switch back to single mode * * The bits_per_word of certain transfer can be different, but it will have no * impact on the signal itself. */ if (!mcspi->use_multi_mode) break; } omap2_mcspi_set_mode(ctlr); /* In single mode only a single channel can have the FORCE bit enabled * in its chconf0 register. * Scan all channels and disable them except the current one. * A FORCE can remain from a last transfer having cs_change enabled * * In multi mode all FORCE bits must be disabled. */ list_for_each_entry(cs, &ctx->cs, node) { if (msg->spi->controller_state == cs && !mcspi->use_multi_mode) { continue; } if ((cs->chconf0 & OMAP2_MCSPI_CHCONF_FORCE)) { cs->chconf0 &= ~OMAP2_MCSPI_CHCONF_FORCE; writel_relaxed(cs->chconf0, cs->base + OMAP2_MCSPI_CHCONF0); readl_relaxed(cs->base + OMAP2_MCSPI_CHCONF0); } } return 0; } static bool omap2_mcspi_can_dma(struct spi_controller *ctlr, struct spi_device *spi, struct spi_transfer *xfer) { struct omap2_mcspi *mcspi = spi_controller_get_devdata(spi->controller); struct omap2_mcspi_dma *mcspi_dma = &mcspi->dma_channels[spi_get_chipselect(spi, 0)]; if (!mcspi_dma->dma_rx || !mcspi_dma->dma_tx) return false; if (spi_controller_is_target(ctlr)) return true; ctlr->dma_rx = mcspi_dma->dma_rx; ctlr->dma_tx = mcspi_dma->dma_tx; return (xfer->len >= DMA_MIN_BYTES); } static size_t omap2_mcspi_max_xfer_size(struct spi_device *spi) { struct omap2_mcspi *mcspi = spi_controller_get_devdata(spi->controller); struct omap2_mcspi_dma *mcspi_dma = &mcspi->dma_channels[spi_get_chipselect(spi, 0)]; if (mcspi->max_xfer_len && mcspi_dma->dma_rx) return mcspi->max_xfer_len; return SIZE_MAX; } static int omap2_mcspi_controller_setup(struct omap2_mcspi *mcspi) { struct spi_controller *ctlr = mcspi->ctlr; struct omap2_mcspi_regs *ctx = &mcspi->ctx; int ret = 0; ret = pm_runtime_resume_and_get(mcspi->dev); if (ret < 0) return ret; mcspi_write_reg(ctlr, OMAP2_MCSPI_WAKEUPENABLE, OMAP2_MCSPI_WAKEUPENABLE_WKEN); ctx->wakeupenable = OMAP2_MCSPI_WAKEUPENABLE_WKEN; omap2_mcspi_set_mode(ctlr); pm_runtime_mark_last_busy(mcspi->dev); pm_runtime_put_autosuspend(mcspi->dev); return 0; } static int omap_mcspi_runtime_suspend(struct device *dev) { int error; error = pinctrl_pm_select_idle_state(dev); if (error) dev_warn(dev, "%s: failed to set pins: %i\n", __func__, error); return 0; } /* * When SPI wake up from off-mode, CS is in activate state. If it was in * inactive state when driver was suspend, then force it to inactive state at * wake up. */ static int omap_mcspi_runtime_resume(struct device *dev) { struct spi_controller *ctlr = dev_get_drvdata(dev); struct omap2_mcspi *mcspi = spi_controller_get_devdata(ctlr); struct omap2_mcspi_regs *ctx = &mcspi->ctx; struct omap2_mcspi_cs *cs; int error; error = pinctrl_pm_select_default_state(dev); if (error) dev_warn(dev, "%s: failed to set pins: %i\n", __func__, error); /* McSPI: context restore */ mcspi_write_reg(ctlr, OMAP2_MCSPI_MODULCTRL, ctx->modulctrl); mcspi_write_reg(ctlr, OMAP2_MCSPI_WAKEUPENABLE, ctx->wakeupenable); list_for_each_entry(cs, &ctx->cs, node) { /* * We need to toggle CS state for OMAP take this * change in account. */ if ((cs->chconf0 & OMAP2_MCSPI_CHCONF_FORCE) == 0) { cs->chconf0 |= OMAP2_MCSPI_CHCONF_FORCE; writel_relaxed(cs->chconf0, cs->base + OMAP2_MCSPI_CHCONF0); cs->chconf0 &= ~OMAP2_MCSPI_CHCONF_FORCE; writel_relaxed(cs->chconf0, cs->base + OMAP2_MCSPI_CHCONF0); } else { writel_relaxed(cs->chconf0, cs->base + OMAP2_MCSPI_CHCONF0); } } return 0; } static struct omap2_mcspi_platform_config omap2_pdata = { .regs_offset = 0, }; static struct omap2_mcspi_platform_config omap4_pdata = { .regs_offset = OMAP4_MCSPI_REG_OFFSET, }; static struct omap2_mcspi_platform_config am654_pdata = { .regs_offset = OMAP4_MCSPI_REG_OFFSET, .max_xfer_len = SZ_4K - 1, }; static const struct of_device_id omap_mcspi_of_match[] = { { .compatible = "ti,omap2-mcspi", .data = &omap2_pdata, }, { .compatible = "ti,omap4-mcspi", .data = &omap4_pdata, }, { .compatible = "ti,am654-mcspi", .data = &am654_pdata, }, { }, }; MODULE_DEVICE_TABLE(of, omap_mcspi_of_match); static int omap2_mcspi_probe(struct platform_device *pdev) { struct spi_controller *ctlr; const struct omap2_mcspi_platform_config *pdata; struct omap2_mcspi *mcspi; struct resource *r; int status = 0, i; u32 regs_offset = 0; struct device_node *node = pdev->dev.of_node; const struct of_device_id *match; if (of_property_read_bool(node, "spi-slave")) ctlr = spi_alloc_target(&pdev->dev, sizeof(*mcspi)); else ctlr = spi_alloc_host(&pdev->dev, sizeof(*mcspi)); if (!ctlr) return -ENOMEM; /* the spi->mode bits understood by this driver: */ ctlr->mode_bits = SPI_CPOL | SPI_CPHA | SPI_CS_HIGH; ctlr->bits_per_word_mask = SPI_BPW_RANGE_MASK(4, 32); ctlr->setup = omap2_mcspi_setup; ctlr->auto_runtime_pm = true; ctlr->prepare_message = omap2_mcspi_prepare_message; ctlr->can_dma = omap2_mcspi_can_dma; ctlr->transfer_one = omap2_mcspi_transfer_one; ctlr->set_cs = omap2_mcspi_set_cs; ctlr->cleanup = omap2_mcspi_cleanup; ctlr->target_abort = omap2_mcspi_target_abort; ctlr->dev.of_node = node; ctlr->use_gpio_descriptors = true; platform_set_drvdata(pdev, ctlr); mcspi = spi_controller_get_devdata(ctlr); mcspi->ctlr = ctlr; match = of_match_device(omap_mcspi_of_match, &pdev->dev); if (match) { u32 num_cs = 1; /* default number of chipselect */ pdata = match->data; of_property_read_u32(node, "ti,spi-num-cs", &num_cs); ctlr->num_chipselect = num_cs; if (of_property_read_bool(node, "ti,pindir-d0-out-d1-in")) mcspi->pin_dir = MCSPI_PINDIR_D0_OUT_D1_IN; } else { pdata = dev_get_platdata(&pdev->dev); ctlr->num_chipselect = pdata->num_cs; mcspi->pin_dir = pdata->pin_dir; } regs_offset = pdata->regs_offset; if (pdata->max_xfer_len) { mcspi->max_xfer_len = pdata->max_xfer_len; ctlr->max_transfer_size = omap2_mcspi_max_xfer_size; } mcspi->base = devm_platform_get_and_ioremap_resource(pdev, 0, &r); if (IS_ERR(mcspi->base)) { status = PTR_ERR(mcspi->base); goto free_ctlr; } mcspi->phys = r->start + regs_offset; mcspi->base += regs_offset; mcspi->dev = &pdev->dev; INIT_LIST_HEAD(&mcspi->ctx.cs); mcspi->dma_channels = devm_kcalloc(&pdev->dev, ctlr->num_chipselect, sizeof(struct omap2_mcspi_dma), GFP_KERNEL); if (mcspi->dma_channels == NULL) { status = -ENOMEM; goto free_ctlr; } for (i = 0; i < ctlr->num_chipselect; i++) { sprintf(mcspi->dma_channels[i].dma_rx_ch_name, "rx%d", i); sprintf(mcspi->dma_channels[i].dma_tx_ch_name, "tx%d", i); status = omap2_mcspi_request_dma(mcspi, &mcspi->dma_channels[i]); if (status == -EPROBE_DEFER) goto free_ctlr; } status = platform_get_irq(pdev, 0); if (status < 0) goto free_ctlr; init_completion(&mcspi->txdone); status = devm_request_irq(&pdev->dev, status, omap2_mcspi_irq_handler, 0, pdev->name, mcspi); if (status) { dev_err(&pdev->dev, "Cannot request IRQ"); goto free_ctlr; } mcspi->ref_clk = devm_clk_get_optional_enabled(&pdev->dev, NULL); if (mcspi->ref_clk) mcspi->ref_clk_hz = clk_get_rate(mcspi->ref_clk); else mcspi->ref_clk_hz = OMAP2_MCSPI_MAX_FREQ; ctlr->max_speed_hz = mcspi->ref_clk_hz; ctlr->min_speed_hz = mcspi->ref_clk_hz >> 15; pm_runtime_use_autosuspend(&pdev->dev); pm_runtime_set_autosuspend_delay(&pdev->dev, SPI_AUTOSUSPEND_TIMEOUT); pm_runtime_enable(&pdev->dev); status = omap2_mcspi_controller_setup(mcspi); if (status < 0) goto disable_pm; status = devm_spi_register_controller(&pdev->dev, ctlr); if (status < 0) goto disable_pm; return status; disable_pm: pm_runtime_dont_use_autosuspend(&pdev->dev); pm_runtime_put_sync(&pdev->dev); pm_runtime_disable(&pdev->dev); free_ctlr: omap2_mcspi_release_dma(ctlr); spi_controller_put(ctlr); return status; } static void omap2_mcspi_remove(struct platform_device *pdev) { struct spi_controller *ctlr = platform_get_drvdata(pdev); struct omap2_mcspi *mcspi = spi_controller_get_devdata(ctlr); omap2_mcspi_release_dma(ctlr); pm_runtime_dont_use_autosuspend(mcspi->dev); pm_runtime_put_sync(mcspi->dev); pm_runtime_disable(&pdev->dev); } /* work with hotplug and coldplug */ MODULE_ALIAS("platform:omap2_mcspi"); static int __maybe_unused omap2_mcspi_suspend(struct device *dev) { struct spi_controller *ctlr = dev_get_drvdata(dev); struct omap2_mcspi *mcspi = spi_controller_get_devdata(ctlr); int error; error = pinctrl_pm_select_sleep_state(dev); if (error) dev_warn(mcspi->dev, "%s: failed to set pins: %i\n", __func__, error); error = spi_controller_suspend(ctlr); if (error) dev_warn(mcspi->dev, "%s: controller suspend failed: %i\n", __func__, error); return pm_runtime_force_suspend(dev); } static int __maybe_unused omap2_mcspi_resume(struct device *dev) { struct spi_controller *ctlr = dev_get_drvdata(dev); struct omap2_mcspi *mcspi = spi_controller_get_devdata(ctlr); int error; error = spi_controller_resume(ctlr); if (error) dev_warn(mcspi->dev, "%s: controller resume failed: %i\n", __func__, error); return pm_runtime_force_resume(dev); } static const struct dev_pm_ops omap2_mcspi_pm_ops = { SET_SYSTEM_SLEEP_PM_OPS(omap2_mcspi_suspend, omap2_mcspi_resume) .runtime_suspend = omap_mcspi_runtime_suspend, .runtime_resume = omap_mcspi_runtime_resume, }; static struct platform_driver omap2_mcspi_driver = { .driver = { .name = "omap2_mcspi", .pm = &omap2_mcspi_pm_ops, .of_match_table = omap_mcspi_of_match, }, .probe = omap2_mcspi_probe, .remove_new = omap2_mcspi_remove, }; module_platform_driver(omap2_mcspi_driver); MODULE_LICENSE("GPL");
Information contained on this website is for historical information purposes only and does not indicate or represent copyright ownership.
Created with Cregit http://github.com/cregit/cregit
Version 2.0-RC1