| Author | Tokens | Token Proportion | Commits | Commit Proportion |
|---|---|---|---|---|
| Pierre Ossman | 6347 | 92.19% | 25 | 36.76% |
| Christoph Hellwig | 107 | 1.55% | 1 | 1.47% |
| Alex Dubov | 75 | 1.09% | 1 | 1.47% |
| Emil Renner Berthing | 65 | 0.94% | 1 | 1.47% |
| Russell King | 31 | 0.45% | 7 | 10.29% |
| Alexey Khoroshilov | 29 | 0.42% | 2 | 2.94% |
| Dmitry Torokhov | 28 | 0.41% | 2 | 2.94% |
| Ulf Hansson | 27 | 0.39% | 2 | 2.94% |
| Tomas Winkler | 21 | 0.31% | 1 | 1.47% |
| Chuck Ebbert | 21 | 0.31% | 1 | 1.47% |
| Girish K.S | 19 | 0.28% | 1 | 1.47% |
| Yang Yingliang | 16 | 0.23% | 1 | 1.47% |
| Kees Cook | 14 | 0.20% | 1 | 1.47% |
| David Howells | 12 | 0.17% | 1 | 1.47% |
| Joe Perches | 10 | 0.15% | 1 | 1.47% |
| Greg Kroah-Hartman | 9 | 0.13% | 1 | 1.47% |
| Marc Zyngier | 8 | 0.12% | 1 | 1.47% |
| Doug Anderson | 5 | 0.07% | 1 | 1.47% |
| Adrian Hunter | 5 | 0.07% | 1 | 1.47% |
| Anton Vorontsov | 4 | 0.06% | 1 | 1.47% |
| Allen Pais | 4 | 0.06% | 1 | 1.47% |
| Pavel Pisa | 4 | 0.06% | 1 | 1.47% |
| Adrian Bunk | 4 | 0.06% | 1 | 1.47% |
| Jens Axboe | 3 | 0.04% | 1 | 1.47% |
| Lucas De Marchi | 3 | 0.04% | 1 | 1.47% |
| Pavel Machek | 2 | 0.03% | 1 | 1.47% |
| Linus Torvalds (pre-git) | 2 | 0.03% | 1 | 1.47% |
| Yangtao Li | 2 | 0.03% | 1 | 1.47% |
| Thomas Gleixner | 2 | 0.03% | 1 | 1.47% |
| Jesper Juhl | 1 | 0.01% | 1 | 1.47% |
| Martin K. Petersen | 1 | 0.01% | 1 | 1.47% |
| Richard Purdie | 1 | 0.01% | 1 | 1.47% |
| Michal Hocko | 1 | 0.01% | 1 | 1.47% |
| David Brownell | 1 | 0.01% | 1 | 1.47% |
| Linus Torvalds | 1 | 0.01% | 1 | 1.47% |
| Total | 6885 | 68 |
// SPDX-License-Identifier: GPL-2.0-or-later /* * linux/drivers/mmc/host/wbsd.c - Winbond W83L51xD SD/MMC driver * * Copyright (C) 2004-2007 Pierre Ossman, All Rights Reserved. * * Warning! * * Changes to the FIFO system should be done with extreme care since * the hardware is full of bugs related to the FIFO. Known issues are: * * - FIFO size field in FSR is always zero. * * - FIFO interrupts tend not to work as they should. Interrupts are * triggered only for full/empty events, not for threshold values. * * - On APIC systems the FIFO empty interrupt is sometimes lost. */ #include <linux/module.h> #include <linux/moduleparam.h> #include <linux/init.h> #include <linux/ioport.h> #include <linux/platform_device.h> #include <linux/interrupt.h> #include <linux/dma-mapping.h> #include <linux/delay.h> #include <linux/pnp.h> #include <linux/highmem.h> #include <linux/mmc/host.h> #include <linux/mmc/mmc.h> #include <linux/mmc/sd.h> #include <linux/scatterlist.h> #include <linux/slab.h> #include <asm/io.h> #include <asm/dma.h> #include "wbsd.h" #define DRIVER_NAME "wbsd" #define DBG(x...) \ pr_debug(DRIVER_NAME ": " x) #define DBGF(f, x...) \ pr_debug(DRIVER_NAME " [%s()]: " f, __func__ , ##x) /* * Device resources */ #ifdef CONFIG_PNP static const struct pnp_device_id pnp_dev_table[] = { { "WEC0517", 0 }, { "WEC0518", 0 }, { "", 0 }, }; MODULE_DEVICE_TABLE(pnp, pnp_dev_table); #endif /* CONFIG_PNP */ static const int config_ports[] = { 0x2E, 0x4E }; static const int unlock_codes[] = { 0x83, 0x87 }; static const int valid_ids[] = { 0x7112, }; #ifdef CONFIG_PNP static unsigned int param_nopnp = 0; #else static const unsigned int param_nopnp = 1; #endif static unsigned int param_io = 0x248; static unsigned int param_irq = 6; static int param_dma = 2; /* * Basic functions */ static inline void wbsd_unlock_config(struct wbsd_host *host) { BUG_ON(host->config == 0); outb(host->unlock_code, host->config); outb(host->unlock_code, host->config); } static inline void wbsd_lock_config(struct wbsd_host *host) { BUG_ON(host->config == 0); outb(LOCK_CODE, host->config); } static inline void wbsd_write_config(struct wbsd_host *host, u8 reg, u8 value) { BUG_ON(host->config == 0); outb(reg, host->config); outb(value, host->config + 1); } static inline u8 wbsd_read_config(struct wbsd_host *host, u8 reg) { BUG_ON(host->config == 0); outb(reg, host->config); return inb(host->config + 1); } static inline void wbsd_write_index(struct wbsd_host *host, u8 index, u8 value) { outb(index, host->base + WBSD_IDXR); outb(value, host->base + WBSD_DATAR); } static inline u8 wbsd_read_index(struct wbsd_host *host, u8 index) { outb(index, host->base + WBSD_IDXR); return inb(host->base + WBSD_DATAR); } /* * Common routines */ static void wbsd_init_device(struct wbsd_host *host) { u8 setup, ier; /* * Reset chip (SD/MMC part) and fifo. */ setup = wbsd_read_index(host, WBSD_IDX_SETUP); setup |= WBSD_FIFO_RESET | WBSD_SOFT_RESET; wbsd_write_index(host, WBSD_IDX_SETUP, setup); /* * Set DAT3 to input */ setup &= ~WBSD_DAT3_H; wbsd_write_index(host, WBSD_IDX_SETUP, setup); host->flags &= ~WBSD_FIGNORE_DETECT; /* * Read back default clock. */ host->clk = wbsd_read_index(host, WBSD_IDX_CLK); /* * Power down port. */ outb(WBSD_POWER_N, host->base + WBSD_CSR); /* * Set maximum timeout. */ wbsd_write_index(host, WBSD_IDX_TAAC, 0x7F); /* * Test for card presence */ if (inb(host->base + WBSD_CSR) & WBSD_CARDPRESENT) host->flags |= WBSD_FCARD_PRESENT; else host->flags &= ~WBSD_FCARD_PRESENT; /* * Enable interesting interrupts. */ ier = 0; ier |= WBSD_EINT_CARD; ier |= WBSD_EINT_FIFO_THRE; ier |= WBSD_EINT_CRC; ier |= WBSD_EINT_TIMEOUT; ier |= WBSD_EINT_TC; outb(ier, host->base + WBSD_EIR); /* * Clear interrupts. */ inb(host->base + WBSD_ISR); } static void wbsd_reset(struct wbsd_host *host) { u8 setup; pr_err("%s: Resetting chip\n", mmc_hostname(host->mmc)); /* * Soft reset of chip (SD/MMC part). */ setup = wbsd_read_index(host, WBSD_IDX_SETUP); setup |= WBSD_SOFT_RESET; wbsd_write_index(host, WBSD_IDX_SETUP, setup); } static void wbsd_request_end(struct wbsd_host *host, struct mmc_request *mrq) { unsigned long dmaflags; if (host->dma >= 0) { /* * Release ISA DMA controller. */ dmaflags = claim_dma_lock(); disable_dma(host->dma); clear_dma_ff(host->dma); release_dma_lock(dmaflags); /* * Disable DMA on host. */ wbsd_write_index(host, WBSD_IDX_DMA, 0); } host->mrq = NULL; /* * MMC layer might call back into the driver so first unlock. */ spin_unlock(&host->lock); mmc_request_done(host->mmc, mrq); spin_lock(&host->lock); } /* * Scatter/gather functions */ static inline void wbsd_init_sg(struct wbsd_host *host, struct mmc_data *data) { /* * Get info. about SG list from data structure. */ host->cur_sg = data->sg; host->num_sg = data->sg_len; host->offset = 0; host->remain = host->cur_sg->length; } static inline int wbsd_next_sg(struct wbsd_host *host) { /* * Skip to next SG entry. */ host->cur_sg++; host->num_sg--; /* * Any entries left? */ if (host->num_sg > 0) { host->offset = 0; host->remain = host->cur_sg->length; } return host->num_sg; } static inline char *wbsd_map_sg(struct wbsd_host *host) { return kmap_local_page(sg_page(host->cur_sg)) + host->cur_sg->offset; } static inline void wbsd_sg_to_dma(struct wbsd_host *host, struct mmc_data *data) { size_t len = 0; int i; for (i = 0; i < data->sg_len; i++) len += data->sg[i].length; sg_copy_to_buffer(data->sg, data->sg_len, host->dma_buffer, len); } static inline void wbsd_dma_to_sg(struct wbsd_host *host, struct mmc_data *data) { size_t len = 0; int i; for (i = 0; i < data->sg_len; i++) len += data->sg[i].length; sg_copy_from_buffer(data->sg, data->sg_len, host->dma_buffer, len); } /* * Command handling */ static inline void wbsd_get_short_reply(struct wbsd_host *host, struct mmc_command *cmd) { /* * Correct response type? */ if (wbsd_read_index(host, WBSD_IDX_RSPLEN) != WBSD_RSP_SHORT) { cmd->error = -EILSEQ; return; } cmd->resp[0] = wbsd_read_index(host, WBSD_IDX_RESP12) << 24; cmd->resp[0] |= wbsd_read_index(host, WBSD_IDX_RESP13) << 16; cmd->resp[0] |= wbsd_read_index(host, WBSD_IDX_RESP14) << 8; cmd->resp[0] |= wbsd_read_index(host, WBSD_IDX_RESP15) << 0; cmd->resp[1] = wbsd_read_index(host, WBSD_IDX_RESP16) << 24; } static inline void wbsd_get_long_reply(struct wbsd_host *host, struct mmc_command *cmd) { int i; /* * Correct response type? */ if (wbsd_read_index(host, WBSD_IDX_RSPLEN) != WBSD_RSP_LONG) { cmd->error = -EILSEQ; return; } for (i = 0; i < 4; i++) { cmd->resp[i] = wbsd_read_index(host, WBSD_IDX_RESP1 + i * 4) << 24; cmd->resp[i] |= wbsd_read_index(host, WBSD_IDX_RESP2 + i * 4) << 16; cmd->resp[i] |= wbsd_read_index(host, WBSD_IDX_RESP3 + i * 4) << 8; cmd->resp[i] |= wbsd_read_index(host, WBSD_IDX_RESP4 + i * 4) << 0; } } static void wbsd_send_command(struct wbsd_host *host, struct mmc_command *cmd) { int i; u8 status, isr; /* * Clear accumulated ISR. The interrupt routine * will fill this one with events that occur during * transfer. */ host->isr = 0; /* * Send the command (CRC calculated by host). */ outb(cmd->opcode, host->base + WBSD_CMDR); for (i = 3; i >= 0; i--) outb((cmd->arg >> (i * 8)) & 0xff, host->base + WBSD_CMDR); cmd->error = 0; /* * Wait for the request to complete. */ do { status = wbsd_read_index(host, WBSD_IDX_STATUS); } while (status & WBSD_CARDTRAFFIC); /* * Do we expect a reply? */ if (cmd->flags & MMC_RSP_PRESENT) { /* * Read back status. */ isr = host->isr; /* Card removed? */ if (isr & WBSD_INT_CARD) cmd->error = -ENOMEDIUM; /* Timeout? */ else if (isr & WBSD_INT_TIMEOUT) cmd->error = -ETIMEDOUT; /* CRC? */ else if ((cmd->flags & MMC_RSP_CRC) && (isr & WBSD_INT_CRC)) cmd->error = -EILSEQ; /* All ok */ else { if (cmd->flags & MMC_RSP_136) wbsd_get_long_reply(host, cmd); else wbsd_get_short_reply(host, cmd); } } } /* * Data functions */ static void wbsd_empty_fifo(struct wbsd_host *host) { struct mmc_data *data = host->mrq->cmd->data; char *buffer; int i, idx, fsr, fifo; /* * Handle excessive data. */ if (host->num_sg == 0) return; buffer = wbsd_map_sg(host) + host->offset; idx = 0; /* * Drain the fifo. This has a tendency to loop longer * than the FIFO length (usually one block). */ while (!((fsr = inb(host->base + WBSD_FSR)) & WBSD_FIFO_EMPTY)) { /* * The size field in the FSR is broken so we have to * do some guessing. */ if (fsr & WBSD_FIFO_FULL) fifo = 16; else if (fsr & WBSD_FIFO_FUTHRE) fifo = 8; else fifo = 1; for (i = 0; i < fifo; i++) { buffer[idx++] = inb(host->base + WBSD_DFR); host->offset++; host->remain--; data->bytes_xfered++; /* * End of scatter list entry? */ if (host->remain == 0) { kunmap_local(buffer); /* * Get next entry. Check if last. */ if (!wbsd_next_sg(host)) return; buffer = wbsd_map_sg(host); idx = 0; } } } kunmap_local(buffer); /* * This is a very dirty hack to solve a * hardware problem. The chip doesn't trigger * FIFO threshold interrupts properly. */ if ((data->blocks * data->blksz - data->bytes_xfered) < 16) tasklet_schedule(&host->fifo_tasklet); } static void wbsd_fill_fifo(struct wbsd_host *host) { struct mmc_data *data = host->mrq->cmd->data; char *buffer; int i, idx, fsr, fifo; /* * Check that we aren't being called after the * entire buffer has been transferred. */ if (host->num_sg == 0) return; buffer = wbsd_map_sg(host) + host->offset; idx = 0; /* * Fill the fifo. This has a tendency to loop longer * than the FIFO length (usually one block). */ while (!((fsr = inb(host->base + WBSD_FSR)) & WBSD_FIFO_FULL)) { /* * The size field in the FSR is broken so we have to * do some guessing. */ if (fsr & WBSD_FIFO_EMPTY) fifo = 0; else if (fsr & WBSD_FIFO_EMTHRE) fifo = 8; else fifo = 15; for (i = 16; i > fifo; i--) { outb(buffer[idx], host->base + WBSD_DFR); host->offset++; host->remain--; data->bytes_xfered++; /* * End of scatter list entry? */ if (host->remain == 0) { kunmap_local(buffer); /* * Get next entry. Check if last. */ if (!wbsd_next_sg(host)) return; buffer = wbsd_map_sg(host); idx = 0; } } } kunmap_local(buffer); /* * The controller stops sending interrupts for * 'FIFO empty' under certain conditions. So we * need to be a bit more pro-active. */ tasklet_schedule(&host->fifo_tasklet); } static void wbsd_prepare_data(struct wbsd_host *host, struct mmc_data *data) { u16 blksize; u8 setup; unsigned long dmaflags; unsigned int size; /* * Calculate size. */ size = data->blocks * data->blksz; /* * Check timeout values for overflow. * (Yes, some cards cause this value to overflow). */ if (data->timeout_ns > 127000000) wbsd_write_index(host, WBSD_IDX_TAAC, 127); else { wbsd_write_index(host, WBSD_IDX_TAAC, data->timeout_ns / 1000000); } if (data->timeout_clks > 255) wbsd_write_index(host, WBSD_IDX_NSAC, 255); else wbsd_write_index(host, WBSD_IDX_NSAC, data->timeout_clks); /* * Inform the chip of how large blocks will be * sent. It needs this to determine when to * calculate CRC. * * Space for CRC must be included in the size. * Two bytes are needed for each data line. */ if (host->bus_width == MMC_BUS_WIDTH_1) { blksize = data->blksz + 2; wbsd_write_index(host, WBSD_IDX_PBSMSB, (blksize >> 4) & 0xF0); wbsd_write_index(host, WBSD_IDX_PBSLSB, blksize & 0xFF); } else if (host->bus_width == MMC_BUS_WIDTH_4) { blksize = data->blksz + 2 * 4; wbsd_write_index(host, WBSD_IDX_PBSMSB, ((blksize >> 4) & 0xF0) | WBSD_DATA_WIDTH); wbsd_write_index(host, WBSD_IDX_PBSLSB, blksize & 0xFF); } else { data->error = -EINVAL; return; } /* * Clear the FIFO. This is needed even for DMA * transfers since the chip still uses the FIFO * internally. */ setup = wbsd_read_index(host, WBSD_IDX_SETUP); setup |= WBSD_FIFO_RESET; wbsd_write_index(host, WBSD_IDX_SETUP, setup); /* * DMA transfer? */ if (host->dma >= 0) { /* * The buffer for DMA is only 64 kB. */ BUG_ON(size > 0x10000); if (size > 0x10000) { data->error = -EINVAL; return; } /* * Transfer data from the SG list to * the DMA buffer. */ if (data->flags & MMC_DATA_WRITE) wbsd_sg_to_dma(host, data); /* * Initialise the ISA DMA controller. */ dmaflags = claim_dma_lock(); disable_dma(host->dma); clear_dma_ff(host->dma); if (data->flags & MMC_DATA_READ) set_dma_mode(host->dma, DMA_MODE_READ & ~0x40); else set_dma_mode(host->dma, DMA_MODE_WRITE & ~0x40); set_dma_addr(host->dma, host->dma_addr); set_dma_count(host->dma, size); enable_dma(host->dma); release_dma_lock(dmaflags); /* * Enable DMA on the host. */ wbsd_write_index(host, WBSD_IDX_DMA, WBSD_DMA_ENABLE); } else { /* * This flag is used to keep printk * output to a minimum. */ host->firsterr = 1; /* * Initialise the SG list. */ wbsd_init_sg(host, data); /* * Turn off DMA. */ wbsd_write_index(host, WBSD_IDX_DMA, 0); /* * Set up FIFO threshold levels (and fill * buffer if doing a write). */ if (data->flags & MMC_DATA_READ) { wbsd_write_index(host, WBSD_IDX_FIFOEN, WBSD_FIFOEN_FULL | 8); } else { wbsd_write_index(host, WBSD_IDX_FIFOEN, WBSD_FIFOEN_EMPTY | 8); wbsd_fill_fifo(host); } } data->error = 0; } static void wbsd_finish_data(struct wbsd_host *host, struct mmc_data *data) { unsigned long dmaflags; int count; u8 status; WARN_ON(host->mrq == NULL); /* * Send a stop command if needed. */ if (data->stop) wbsd_send_command(host, data->stop); /* * Wait for the controller to leave data * transfer state. */ do { status = wbsd_read_index(host, WBSD_IDX_STATUS); } while (status & (WBSD_BLOCK_READ | WBSD_BLOCK_WRITE)); /* * DMA transfer? */ if (host->dma >= 0) { /* * Disable DMA on the host. */ wbsd_write_index(host, WBSD_IDX_DMA, 0); /* * Turn of ISA DMA controller. */ dmaflags = claim_dma_lock(); disable_dma(host->dma); clear_dma_ff(host->dma); count = get_dma_residue(host->dma); release_dma_lock(dmaflags); data->bytes_xfered = host->mrq->data->blocks * host->mrq->data->blksz - count; data->bytes_xfered -= data->bytes_xfered % data->blksz; /* * Any leftover data? */ if (count) { pr_err("%s: Incomplete DMA transfer. " "%d bytes left.\n", mmc_hostname(host->mmc), count); if (!data->error) data->error = -EIO; } else { /* * Transfer data from DMA buffer to * SG list. */ if (data->flags & MMC_DATA_READ) wbsd_dma_to_sg(host, data); } if (data->error) { if (data->bytes_xfered) data->bytes_xfered -= data->blksz; } } wbsd_request_end(host, host->mrq); } /*****************************************************************************\ * * * MMC layer callbacks * * * \*****************************************************************************/ static void wbsd_request(struct mmc_host *mmc, struct mmc_request *mrq) { struct wbsd_host *host = mmc_priv(mmc); struct mmc_command *cmd; /* * Disable tasklets to avoid a deadlock. */ spin_lock_bh(&host->lock); BUG_ON(host->mrq != NULL); cmd = mrq->cmd; host->mrq = mrq; /* * Check that there is actually a card in the slot. */ if (!(host->flags & WBSD_FCARD_PRESENT)) { cmd->error = -ENOMEDIUM; goto done; } if (cmd->data) { /* * The hardware is so delightfully stupid that it has a list * of "data" commands. If a command isn't on this list, it'll * just go back to the idle state and won't send any data * interrupts. */ switch (cmd->opcode) { case SD_SWITCH_VOLTAGE: case MMC_READ_SINGLE_BLOCK: case MMC_READ_MULTIPLE_BLOCK: case MMC_WRITE_DAT_UNTIL_STOP: case MMC_WRITE_BLOCK: case MMC_WRITE_MULTIPLE_BLOCK: case MMC_PROGRAM_CID: case MMC_PROGRAM_CSD: case MMC_SEND_WRITE_PROT: case MMC_LOCK_UNLOCK: case MMC_GEN_CMD: break; /* ACMDs. We don't keep track of state, so we just treat them * like any other command. */ case SD_APP_SEND_SCR: break; default: pr_warn("%s: Data command %d is not supported by this controller\n", mmc_hostname(host->mmc), cmd->opcode); cmd->error = -EINVAL; goto done; } } /* * Does the request include data? */ if (cmd->data) { wbsd_prepare_data(host, cmd->data); if (cmd->data->error) goto done; } wbsd_send_command(host, cmd); /* * If this is a data transfer the request * will be finished after the data has * transferred. */ if (cmd->data && !cmd->error) { /* * Dirty fix for hardware bug. */ if (host->dma == -1) tasklet_schedule(&host->fifo_tasklet); spin_unlock_bh(&host->lock); return; } done: wbsd_request_end(host, mrq); spin_unlock_bh(&host->lock); } static void wbsd_set_ios(struct mmc_host *mmc, struct mmc_ios *ios) { struct wbsd_host *host = mmc_priv(mmc); u8 clk, setup, pwr; spin_lock_bh(&host->lock); /* * Reset the chip on each power off. * Should clear out any weird states. */ if (ios->power_mode == MMC_POWER_OFF) wbsd_init_device(host); if (ios->clock >= 24000000) clk = WBSD_CLK_24M; else if (ios->clock >= 16000000) clk = WBSD_CLK_16M; else if (ios->clock >= 12000000) clk = WBSD_CLK_12M; else clk = WBSD_CLK_375K; /* * Only write to the clock register when * there is an actual change. */ if (clk != host->clk) { wbsd_write_index(host, WBSD_IDX_CLK, clk); host->clk = clk; } /* * Power up card. */ if (ios->power_mode != MMC_POWER_OFF) { pwr = inb(host->base + WBSD_CSR); pwr &= ~WBSD_POWER_N; outb(pwr, host->base + WBSD_CSR); } /* * MMC cards need to have pin 1 high during init. * It wreaks havoc with the card detection though so * that needs to be disabled. */ setup = wbsd_read_index(host, WBSD_IDX_SETUP); if (ios->chip_select == MMC_CS_HIGH) { BUG_ON(ios->bus_width != MMC_BUS_WIDTH_1); setup |= WBSD_DAT3_H; host->flags |= WBSD_FIGNORE_DETECT; } else { if (setup & WBSD_DAT3_H) { setup &= ~WBSD_DAT3_H; /* * We cannot resume card detection immediately * because of capacitance and delays in the chip. */ mod_timer(&host->ignore_timer, jiffies + HZ / 100); } } wbsd_write_index(host, WBSD_IDX_SETUP, setup); /* * Store bus width for later. Will be used when * setting up the data transfer. */ host->bus_width = ios->bus_width; spin_unlock_bh(&host->lock); } static int wbsd_get_ro(struct mmc_host *mmc) { struct wbsd_host *host = mmc_priv(mmc); u8 csr; spin_lock_bh(&host->lock); csr = inb(host->base + WBSD_CSR); csr |= WBSD_MSLED; outb(csr, host->base + WBSD_CSR); mdelay(1); csr = inb(host->base + WBSD_CSR); csr &= ~WBSD_MSLED; outb(csr, host->base + WBSD_CSR); spin_unlock_bh(&host->lock); return !!(csr & WBSD_WRPT); } static const struct mmc_host_ops wbsd_ops = { .request = wbsd_request, .set_ios = wbsd_set_ios, .get_ro = wbsd_get_ro, }; /*****************************************************************************\ * * * Interrupt handling * * * \*****************************************************************************/ /* * Helper function to reset detection ignore */ static void wbsd_reset_ignore(struct timer_list *t) { struct wbsd_host *host = from_timer(host, t, ignore_timer); BUG_ON(host == NULL); DBG("Resetting card detection ignore\n"); spin_lock_bh(&host->lock); host->flags &= ~WBSD_FIGNORE_DETECT; /* * Card status might have changed during the * blackout. */ tasklet_schedule(&host->card_tasklet); spin_unlock_bh(&host->lock); } /* * Tasklets */ static inline struct mmc_data *wbsd_get_data(struct wbsd_host *host) { WARN_ON(!host->mrq); if (!host->mrq) return NULL; WARN_ON(!host->mrq->cmd); if (!host->mrq->cmd) return NULL; WARN_ON(!host->mrq->cmd->data); if (!host->mrq->cmd->data) return NULL; return host->mrq->cmd->data; } static void wbsd_tasklet_card(struct tasklet_struct *t) { struct wbsd_host *host = from_tasklet(host, t, card_tasklet); u8 csr; int delay = -1; spin_lock(&host->lock); if (host->flags & WBSD_FIGNORE_DETECT) { spin_unlock(&host->lock); return; } csr = inb(host->base + WBSD_CSR); WARN_ON(csr == 0xff); if (csr & WBSD_CARDPRESENT) { if (!(host->flags & WBSD_FCARD_PRESENT)) { DBG("Card inserted\n"); host->flags |= WBSD_FCARD_PRESENT; delay = 500; } } else if (host->flags & WBSD_FCARD_PRESENT) { DBG("Card removed\n"); host->flags &= ~WBSD_FCARD_PRESENT; if (host->mrq) { pr_err("%s: Card removed during transfer!\n", mmc_hostname(host->mmc)); wbsd_reset(host); host->mrq->cmd->error = -ENOMEDIUM; tasklet_schedule(&host->finish_tasklet); } delay = 0; } /* * Unlock first since we might get a call back. */ spin_unlock(&host->lock); if (delay != -1) mmc_detect_change(host->mmc, msecs_to_jiffies(delay)); } static void wbsd_tasklet_fifo(struct tasklet_struct *t) { struct wbsd_host *host = from_tasklet(host, t, fifo_tasklet); struct mmc_data *data; spin_lock(&host->lock); if (!host->mrq) goto end; data = wbsd_get_data(host); if (!data) goto end; if (data->flags & MMC_DATA_WRITE) wbsd_fill_fifo(host); else wbsd_empty_fifo(host); /* * Done? */ if (host->num_sg == 0) { wbsd_write_index(host, WBSD_IDX_FIFOEN, 0); tasklet_schedule(&host->finish_tasklet); } end: spin_unlock(&host->lock); } static void wbsd_tasklet_crc(struct tasklet_struct *t) { struct wbsd_host *host = from_tasklet(host, t, crc_tasklet); struct mmc_data *data; spin_lock(&host->lock); if (!host->mrq) goto end; data = wbsd_get_data(host); if (!data) goto end; DBGF("CRC error\n"); data->error = -EILSEQ; tasklet_schedule(&host->finish_tasklet); end: spin_unlock(&host->lock); } static void wbsd_tasklet_timeout(struct tasklet_struct *t) { struct wbsd_host *host = from_tasklet(host, t, timeout_tasklet); struct mmc_data *data; spin_lock(&host->lock); if (!host->mrq) goto end; data = wbsd_get_data(host); if (!data) goto end; DBGF("Timeout\n"); data->error = -ETIMEDOUT; tasklet_schedule(&host->finish_tasklet); end: spin_unlock(&host->lock); } static void wbsd_tasklet_finish(struct tasklet_struct *t) { struct wbsd_host *host = from_tasklet(host, t, finish_tasklet); struct mmc_data *data; spin_lock(&host->lock); WARN_ON(!host->mrq); if (!host->mrq) goto end; data = wbsd_get_data(host); if (!data) goto end; wbsd_finish_data(host, data); end: spin_unlock(&host->lock); } /* * Interrupt handling */ static irqreturn_t wbsd_irq(int irq, void *dev_id) { struct wbsd_host *host = dev_id; int isr; isr = inb(host->base + WBSD_ISR); /* * Was it actually our hardware that caused the interrupt? */ if (isr == 0xff || isr == 0x00) return IRQ_NONE; host->isr |= isr; /* * Schedule tasklets as needed. */ if (isr & WBSD_INT_CARD) tasklet_schedule(&host->card_tasklet); if (isr & WBSD_INT_FIFO_THRE) tasklet_schedule(&host->fifo_tasklet); if (isr & WBSD_INT_CRC) tasklet_hi_schedule(&host->crc_tasklet); if (isr & WBSD_INT_TIMEOUT) tasklet_hi_schedule(&host->timeout_tasklet); if (isr & WBSD_INT_TC) tasklet_schedule(&host->finish_tasklet); return IRQ_HANDLED; } /*****************************************************************************\ * * * Device initialisation and shutdown * * * \*****************************************************************************/ /* * Allocate/free MMC structure. */ static int wbsd_alloc_mmc(struct device *dev) { struct mmc_host *mmc; struct wbsd_host *host; /* * Allocate MMC structure. */ mmc = mmc_alloc_host(sizeof(struct wbsd_host), dev); if (!mmc) return -ENOMEM; host = mmc_priv(mmc); host->mmc = mmc; host->dma = -1; /* * Set host parameters. */ mmc->ops = &wbsd_ops; mmc->f_min = 375000; mmc->f_max = 24000000; mmc->ocr_avail = MMC_VDD_32_33 | MMC_VDD_33_34; mmc->caps = MMC_CAP_4_BIT_DATA; spin_lock_init(&host->lock); /* * Set up timers */ timer_setup(&host->ignore_timer, wbsd_reset_ignore, 0); /* * Maximum number of segments. Worst case is one sector per segment * so this will be 64kB/512. */ mmc->max_segs = 128; /* * Maximum request size. Also limited by 64KiB buffer. */ mmc->max_req_size = 65536; /* * Maximum segment size. Could be one segment with the maximum number * of bytes. */ mmc->max_seg_size = mmc->max_req_size; /* * Maximum block size. We have 12 bits (= 4095) but have to subtract * space for CRC. So the maximum is 4095 - 4*2 = 4087. */ mmc->max_blk_size = 4087; /* * Maximum block count. There is no real limit so the maximum * request size will be the only restriction. */ mmc->max_blk_count = mmc->max_req_size; dev_set_drvdata(dev, mmc); return 0; } static void wbsd_free_mmc(struct device *dev) { struct mmc_host *mmc; struct wbsd_host *host; mmc = dev_get_drvdata(dev); if (!mmc) return; host = mmc_priv(mmc); BUG_ON(host == NULL); del_timer_sync(&host->ignore_timer); mmc_free_host(mmc); } /* * Scan for known chip id:s */ static int wbsd_scan(struct wbsd_host *host) { int i, j, k; int id; /* * Iterate through all ports, all codes to * find hardware that is in our known list. */ for (i = 0; i < ARRAY_SIZE(config_ports); i++) { if (!request_region(config_ports[i], 2, DRIVER_NAME)) continue; for (j = 0; j < ARRAY_SIZE(unlock_codes); j++) { id = 0xFFFF; host->config = config_ports[i]; host->unlock_code = unlock_codes[j]; wbsd_unlock_config(host); outb(WBSD_CONF_ID_HI, config_ports[i]); id = inb(config_ports[i] + 1) << 8; outb(WBSD_CONF_ID_LO, config_ports[i]); id |= inb(config_ports[i] + 1); wbsd_lock_config(host); for (k = 0; k < ARRAY_SIZE(valid_ids); k++) { if (id == valid_ids[k]) { host->chip_id = id; return 0; } } if (id != 0xFFFF) { DBG("Unknown hardware (id %x) found at %x\n", id, config_ports[i]); } } release_region(config_ports[i], 2); } host->config = 0; host->unlock_code = 0; return -ENODEV; } /* * Allocate/free io port ranges */ static int wbsd_request_region(struct wbsd_host *host, int base) { if (base & 0x7) return -EINVAL; if (!request_region(base, 8, DRIVER_NAME)) return -EIO; host->base = base; return 0; } static void wbsd_release_regions(struct wbsd_host *host) { if (host->base) release_region(host->base, 8); host->base = 0; if (host->config) release_region(host->config, 2); host->config = 0; } /* * Allocate/free DMA port and buffer */ static void wbsd_request_dma(struct wbsd_host *host, int dma) { if (dma < 0) return; if (request_dma(dma, DRIVER_NAME)) goto err; /* * We need to allocate a special buffer in * order for ISA to be able to DMA to it. */ host->dma_buffer = kmalloc(WBSD_DMA_SIZE, GFP_NOIO | GFP_DMA | __GFP_RETRY_MAYFAIL | __GFP_NOWARN); if (!host->dma_buffer) goto free; /* * Translate the address to a physical address. */ host->dma_addr = dma_map_single(mmc_dev(host->mmc), host->dma_buffer, WBSD_DMA_SIZE, DMA_BIDIRECTIONAL); if (dma_mapping_error(mmc_dev(host->mmc), host->dma_addr)) goto kfree; /* * ISA DMA must be aligned on a 64k basis. */ if ((host->dma_addr & 0xffff) != 0) goto unmap; /* * ISA cannot access memory above 16 MB. */ else if (host->dma_addr >= 0x1000000) goto unmap; host->dma = dma; return; unmap: /* * If we've gotten here then there is some kind of alignment bug */ BUG_ON(1); dma_unmap_single(mmc_dev(host->mmc), host->dma_addr, WBSD_DMA_SIZE, DMA_BIDIRECTIONAL); host->dma_addr = 0; kfree: kfree(host->dma_buffer); host->dma_buffer = NULL; free: free_dma(dma); err: pr_warn(DRIVER_NAME ": Unable to allocate DMA %d - falling back on FIFO\n", dma); } static void wbsd_release_dma(struct wbsd_host *host) { /* * host->dma_addr is valid here iff host->dma_buffer is not NULL. */ if (host->dma_buffer) { dma_unmap_single(mmc_dev(host->mmc), host->dma_addr, WBSD_DMA_SIZE, DMA_BIDIRECTIONAL); kfree(host->dma_buffer); } if (host->dma >= 0) free_dma(host->dma); host->dma = -1; host->dma_buffer = NULL; host->dma_addr = 0; } /* * Allocate/free IRQ. */ static int wbsd_request_irq(struct wbsd_host *host, int irq) { int ret; /* * Set up tasklets. Must be done before requesting interrupt. */ tasklet_setup(&host->card_tasklet, wbsd_tasklet_card); tasklet_setup(&host->fifo_tasklet, wbsd_tasklet_fifo); tasklet_setup(&host->crc_tasklet, wbsd_tasklet_crc); tasklet_setup(&host->timeout_tasklet, wbsd_tasklet_timeout); tasklet_setup(&host->finish_tasklet, wbsd_tasklet_finish); /* * Allocate interrupt. */ ret = request_irq(irq, wbsd_irq, IRQF_SHARED, DRIVER_NAME, host); if (ret) return ret; host->irq = irq; return 0; } static void wbsd_release_irq(struct wbsd_host *host) { if (!host->irq) return; free_irq(host->irq, host); host->irq = 0; tasklet_kill(&host->card_tasklet); tasklet_kill(&host->fifo_tasklet); tasklet_kill(&host->crc_tasklet); tasklet_kill(&host->timeout_tasklet); tasklet_kill(&host->finish_tasklet); } /* * Allocate all resources for the host. */ static int wbsd_request_resources(struct wbsd_host *host, int base, int irq, int dma) { int ret; /* * Allocate I/O ports. */ ret = wbsd_request_region(host, base); if (ret) return ret; /* * Allocate interrupt. */ ret = wbsd_request_irq(host, irq); if (ret) return ret; /* * Allocate DMA. */ wbsd_request_dma(host, dma); return 0; } /* * Release all resources for the host. */ static void wbsd_release_resources(struct wbsd_host *host) { wbsd_release_dma(host); wbsd_release_irq(host); wbsd_release_regions(host); } /* * Configure the resources the chip should use. */ static void wbsd_chip_config(struct wbsd_host *host) { wbsd_unlock_config(host); /* * Reset the chip. */ wbsd_write_config(host, WBSD_CONF_SWRST, 1); wbsd_write_config(host, WBSD_CONF_SWRST, 0); /* * Select SD/MMC function. */ wbsd_write_config(host, WBSD_CONF_DEVICE, DEVICE_SD); /* * Set up card detection. */ wbsd_write_config(host, WBSD_CONF_PINS, WBSD_PINS_DETECT_GP11); /* * Configure chip */ wbsd_write_config(host, WBSD_CONF_PORT_HI, host->base >> 8); wbsd_write_config(host, WBSD_CONF_PORT_LO, host->base & 0xff); wbsd_write_config(host, WBSD_CONF_IRQ, host->irq); if (host->dma >= 0) wbsd_write_config(host, WBSD_CONF_DRQ, host->dma); /* * Enable and power up chip. */ wbsd_write_config(host, WBSD_CONF_ENABLE, 1); wbsd_write_config(host, WBSD_CONF_POWER, 0x20); wbsd_lock_config(host); } /* * Check that configured resources are correct. */ static int wbsd_chip_validate(struct wbsd_host *host) { int base, irq, dma; wbsd_unlock_config(host); /* * Select SD/MMC function. */ wbsd_write_config(host, WBSD_CONF_DEVICE, DEVICE_SD); /* * Read configuration. */ base = wbsd_read_config(host, WBSD_CONF_PORT_HI) << 8; base |= wbsd_read_config(host, WBSD_CONF_PORT_LO); irq = wbsd_read_config(host, WBSD_CONF_IRQ); dma = wbsd_read_config(host, WBSD_CONF_DRQ); wbsd_lock_config(host); /* * Validate against given configuration. */ if (base != host->base) return 0; if (irq != host->irq) return 0; if ((dma != host->dma) && (host->dma != -1)) return 0; return 1; } /* * Powers down the SD function */ static void wbsd_chip_poweroff(struct wbsd_host *host) { wbsd_unlock_config(host); wbsd_write_config(host, WBSD_CONF_DEVICE, DEVICE_SD); wbsd_write_config(host, WBSD_CONF_ENABLE, 0); wbsd_lock_config(host); } /*****************************************************************************\ * * * Devices setup and shutdown * * * \*****************************************************************************/ static int wbsd_init(struct device *dev, int base, int irq, int dma, int pnp) { struct wbsd_host *host = NULL; struct mmc_host *mmc = NULL; int ret; ret = wbsd_alloc_mmc(dev); if (ret) return ret; mmc = dev_get_drvdata(dev); host = mmc_priv(mmc); /* * Scan for hardware. */ ret = wbsd_scan(host); if (ret) { if (pnp && (ret == -ENODEV)) { pr_warn(DRIVER_NAME ": Unable to confirm device presence - you may experience lock-ups\n"); } else { wbsd_free_mmc(dev); return ret; } } /* * Request resources. */ ret = wbsd_request_resources(host, base, irq, dma); if (ret) { wbsd_release_resources(host); wbsd_free_mmc(dev); return ret; } /* * See if chip needs to be configured. */ if (pnp) { if ((host->config != 0) && !wbsd_chip_validate(host)) { pr_warn(DRIVER_NAME ": PnP active but chip not configured! You probably have a buggy BIOS. Configuring chip manually.\n"); wbsd_chip_config(host); } } else wbsd_chip_config(host); /* * Power Management stuff. No idea how this works. * Not tested. */ #ifdef CONFIG_PM if (host->config) { wbsd_unlock_config(host); wbsd_write_config(host, WBSD_CONF_PME, 0xA0); wbsd_lock_config(host); } #endif /* * Allow device to initialise itself properly. */ mdelay(5); /* * Reset the chip into a known state. */ wbsd_init_device(host); ret = mmc_add_host(mmc); if (ret) { if (!pnp) wbsd_chip_poweroff(host); wbsd_release_resources(host); wbsd_free_mmc(dev); return ret; } pr_info("%s: W83L51xD", mmc_hostname(mmc)); if (host->chip_id != 0) printk(" id %x", (int)host->chip_id); printk(" at 0x%x irq %d", (int)host->base, (int)host->irq); if (host->dma >= 0) printk(" dma %d", (int)host->dma); else printk(" FIFO"); if (pnp) printk(" PnP"); printk("\n"); return 0; } static void wbsd_shutdown(struct device *dev, int pnp) { struct mmc_host *mmc = dev_get_drvdata(dev); struct wbsd_host *host; if (!mmc) return; host = mmc_priv(mmc); mmc_remove_host(mmc); /* * Power down the SD/MMC function. */ if (!pnp) wbsd_chip_poweroff(host); wbsd_release_resources(host); wbsd_free_mmc(dev); } /* * Non-PnP */ static int wbsd_probe(struct platform_device *dev) { /* Use the module parameters for resources */ return wbsd_init(&dev->dev, param_io, param_irq, param_dma, 0); } static void wbsd_remove(struct platform_device *dev) { wbsd_shutdown(&dev->dev, 0); } /* * PnP */ #ifdef CONFIG_PNP static int wbsd_pnp_probe(struct pnp_dev *pnpdev, const struct pnp_device_id *dev_id) { int io, irq, dma; /* * Get resources from PnP layer. */ io = pnp_port_start(pnpdev, 0); irq = pnp_irq(pnpdev, 0); if (pnp_dma_valid(pnpdev, 0)) dma = pnp_dma(pnpdev, 0); else dma = -1; DBGF("PnP resources: port %3x irq %d dma %d\n", io, irq, dma); return wbsd_init(&pnpdev->dev, io, irq, dma, 1); } static void wbsd_pnp_remove(struct pnp_dev *dev) { wbsd_shutdown(&dev->dev, 1); } #endif /* CONFIG_PNP */ /* * Power management */ #ifdef CONFIG_PM static int wbsd_platform_suspend(struct platform_device *dev, pm_message_t state) { struct mmc_host *mmc = platform_get_drvdata(dev); struct wbsd_host *host; if (mmc == NULL) return 0; DBGF("Suspending...\n"); host = mmc_priv(mmc); wbsd_chip_poweroff(host); return 0; } static int wbsd_platform_resume(struct platform_device *dev) { struct mmc_host *mmc = platform_get_drvdata(dev); struct wbsd_host *host; if (mmc == NULL) return 0; DBGF("Resuming...\n"); host = mmc_priv(mmc); wbsd_chip_config(host); /* * Allow device to initialise itself properly. */ mdelay(5); wbsd_init_device(host); return 0; } #ifdef CONFIG_PNP static int wbsd_pnp_suspend(struct pnp_dev *pnp_dev, pm_message_t state) { struct mmc_host *mmc = dev_get_drvdata(&pnp_dev->dev); if (mmc == NULL) return 0; DBGF("Suspending...\n"); return 0; } static int wbsd_pnp_resume(struct pnp_dev *pnp_dev) { struct mmc_host *mmc = dev_get_drvdata(&pnp_dev->dev); struct wbsd_host *host; if (mmc == NULL) return 0; DBGF("Resuming...\n"); host = mmc_priv(mmc); /* * See if chip needs to be configured. */ if (host->config != 0) { if (!wbsd_chip_validate(host)) { pr_warn(DRIVER_NAME ": PnP active but chip not configured! You probably have a buggy BIOS. Configuring chip manually.\n"); wbsd_chip_config(host); } } /* * Allow device to initialise itself properly. */ mdelay(5); wbsd_init_device(host); return 0; } #endif /* CONFIG_PNP */ #else /* CONFIG_PM */ #define wbsd_platform_suspend NULL #define wbsd_platform_resume NULL #define wbsd_pnp_suspend NULL #define wbsd_pnp_resume NULL #endif /* CONFIG_PM */ static struct platform_device *wbsd_device; static struct platform_driver wbsd_driver = { .probe = wbsd_probe, .remove_new = wbsd_remove, .suspend = wbsd_platform_suspend, .resume = wbsd_platform_resume, .driver = { .name = DRIVER_NAME, .probe_type = PROBE_PREFER_ASYNCHRONOUS, }, }; #ifdef CONFIG_PNP static struct pnp_driver wbsd_pnp_driver = { .name = DRIVER_NAME, .id_table = pnp_dev_table, .probe = wbsd_pnp_probe, .remove = wbsd_pnp_remove, .suspend = wbsd_pnp_suspend, .resume = wbsd_pnp_resume, }; #endif /* CONFIG_PNP */ /* * Module loading/unloading */ static int __init wbsd_drv_init(void) { int result; pr_info(DRIVER_NAME ": Winbond W83L51xD SD/MMC card interface driver\n"); pr_info(DRIVER_NAME ": Copyright(c) Pierre Ossman\n"); #ifdef CONFIG_PNP if (!param_nopnp) { result = pnp_register_driver(&wbsd_pnp_driver); if (result < 0) return result; } #endif /* CONFIG_PNP */ if (param_nopnp) { result = platform_driver_register(&wbsd_driver); if (result < 0) return result; wbsd_device = platform_device_alloc(DRIVER_NAME, -1); if (!wbsd_device) { platform_driver_unregister(&wbsd_driver); return -ENOMEM; } result = platform_device_add(wbsd_device); if (result) { platform_device_put(wbsd_device); platform_driver_unregister(&wbsd_driver); return result; } } return 0; } static void __exit wbsd_drv_exit(void) { #ifdef CONFIG_PNP if (!param_nopnp) pnp_unregister_driver(&wbsd_pnp_driver); #endif /* CONFIG_PNP */ if (param_nopnp) { platform_device_unregister(wbsd_device); platform_driver_unregister(&wbsd_driver); } DBG("unloaded\n"); } module_init(wbsd_drv_init); module_exit(wbsd_drv_exit); #ifdef CONFIG_PNP module_param_hw_named(nopnp, param_nopnp, uint, other, 0444); #endif module_param_hw_named(io, param_io, uint, ioport, 0444); module_param_hw_named(irq, param_irq, uint, irq, 0444); module_param_hw_named(dma, param_dma, int, dma, 0444); MODULE_LICENSE("GPL"); MODULE_AUTHOR("Pierre Ossman <pierre@ossman.eu>"); MODULE_DESCRIPTION("Winbond W83L51xD SD/MMC card interface driver"); #ifdef CONFIG_PNP MODULE_PARM_DESC(nopnp, "Scan for device instead of relying on PNP. (default 0)"); #endif MODULE_PARM_DESC(io, "I/O base to allocate. Must be 8 byte aligned. (default 0x248)"); MODULE_PARM_DESC(irq, "IRQ to allocate. (default 6)"); MODULE_PARM_DESC(dma, "DMA channel to allocate. -1 for no DMA. (default 2)");
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