diff options
Diffstat (limited to 'drivers/staging/media/solo6x10/solo6x10-p2m.c')
| -rw-r--r-- | drivers/staging/media/solo6x10/solo6x10-p2m.c | 333 |
1 files changed, 333 insertions, 0 deletions
diff --git a/drivers/staging/media/solo6x10/solo6x10-p2m.c b/drivers/staging/media/solo6x10/solo6x10-p2m.c new file mode 100644 index 000000000000..333594189b81 --- /dev/null +++ b/drivers/staging/media/solo6x10/solo6x10-p2m.c @@ -0,0 +1,333 @@ +/* + * Copyright (C) 2010-2013 Bluecherry, LLC <http://www.bluecherrydvr.com> + * + * Original author: + * Ben Collins <bcollins@ubuntu.com> + * + * Additional work by: + * John Brooks <john.brooks@bluecherry.net> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. + */ + +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/slab.h> + +#include "solo6x10.h" + +static int multi_p2m; +module_param(multi_p2m, uint, 0644); +MODULE_PARM_DESC(multi_p2m, + "Use multiple P2M DMA channels (default: no, 6010-only)"); + +static int desc_mode; +module_param(desc_mode, uint, 0644); +MODULE_PARM_DESC(desc_mode, + "Allow use of descriptor mode DMA (default: no, 6010-only)"); + +int solo_p2m_dma(struct solo_dev *solo_dev, int wr, + void *sys_addr, u32 ext_addr, u32 size, + int repeat, u32 ext_size) +{ + dma_addr_t dma_addr; + int ret; + + if (WARN_ON_ONCE((unsigned long)sys_addr & 0x03)) + return -EINVAL; + if (WARN_ON_ONCE(!size)) + return -EINVAL; + + dma_addr = pci_map_single(solo_dev->pdev, sys_addr, size, + wr ? PCI_DMA_TODEVICE : PCI_DMA_FROMDEVICE); + if (pci_dma_mapping_error(solo_dev->pdev, dma_addr)) + return -ENOMEM; + + ret = solo_p2m_dma_t(solo_dev, wr, dma_addr, ext_addr, size, + repeat, ext_size); + + pci_unmap_single(solo_dev->pdev, dma_addr, size, + wr ? PCI_DMA_TODEVICE : PCI_DMA_FROMDEVICE); + + return ret; +} + +/* Mutex must be held for p2m_id before calling this!! */ +int solo_p2m_dma_desc(struct solo_dev *solo_dev, + struct solo_p2m_desc *desc, dma_addr_t desc_dma, + int desc_cnt) +{ + struct solo_p2m_dev *p2m_dev; + unsigned int timeout; + unsigned int config = 0; + int ret = 0; + int p2m_id = 0; + + /* Get next ID. According to Softlogic, 6110 has problems on !=0 P2M */ + if (solo_dev->type != SOLO_DEV_6110 && multi_p2m) { + p2m_id = atomic_inc_return(&solo_dev->p2m_count) % SOLO_NR_P2M; + if (p2m_id < 0) + p2m_id = -p2m_id; + } + + p2m_dev = &solo_dev->p2m_dev[p2m_id]; + + if (mutex_lock_interruptible(&p2m_dev->mutex)) + return -EINTR; + + INIT_COMPLETION(p2m_dev->completion); + p2m_dev->error = 0; + + if (desc_cnt > 1 && solo_dev->type != SOLO_DEV_6110 && desc_mode) { + /* For 6010 with more than one desc, we can do a one-shot */ + p2m_dev->desc_count = p2m_dev->desc_idx = 0; + config = solo_reg_read(solo_dev, SOLO_P2M_CONFIG(p2m_id)); + + solo_reg_write(solo_dev, SOLO_P2M_DES_ADR(p2m_id), desc_dma); + solo_reg_write(solo_dev, SOLO_P2M_DESC_ID(p2m_id), desc_cnt); + solo_reg_write(solo_dev, SOLO_P2M_CONFIG(p2m_id), config | + SOLO_P2M_DESC_MODE); + } else { + /* For single descriptors and 6110, we need to run each desc */ + p2m_dev->desc_count = desc_cnt; + p2m_dev->desc_idx = 1; + p2m_dev->descs = desc; + + solo_reg_write(solo_dev, SOLO_P2M_TAR_ADR(p2m_id), + desc[1].dma_addr); + solo_reg_write(solo_dev, SOLO_P2M_EXT_ADR(p2m_id), + desc[1].ext_addr); + solo_reg_write(solo_dev, SOLO_P2M_EXT_CFG(p2m_id), + desc[1].cfg); + solo_reg_write(solo_dev, SOLO_P2M_CONTROL(p2m_id), + desc[1].ctrl); + } + + timeout = wait_for_completion_timeout(&p2m_dev->completion, + solo_dev->p2m_jiffies); + + if (WARN_ON_ONCE(p2m_dev->error)) + ret = -EIO; + else if (timeout == 0) { + solo_dev->p2m_timeouts++; + ret = -EAGAIN; + } + + solo_reg_write(solo_dev, SOLO_P2M_CONTROL(p2m_id), 0); + + /* Don't write here for the no_desc_mode case, because config is 0. + * We can't test no_desc_mode again, it might race. */ + if (desc_cnt > 1 && solo_dev->type != SOLO_DEV_6110 && config) + solo_reg_write(solo_dev, SOLO_P2M_CONFIG(p2m_id), config); + + mutex_unlock(&p2m_dev->mutex); + + return ret; +} + +void solo_p2m_fill_desc(struct solo_p2m_desc *desc, int wr, + dma_addr_t dma_addr, u32 ext_addr, u32 size, + int repeat, u32 ext_size) +{ + WARN_ON_ONCE(dma_addr & 0x03); + WARN_ON_ONCE(!size); + + desc->cfg = SOLO_P2M_COPY_SIZE(size >> 2); + desc->ctrl = SOLO_P2M_BURST_SIZE(SOLO_P2M_BURST_256) | + (wr ? SOLO_P2M_WRITE : 0) | SOLO_P2M_TRANS_ON; + + if (repeat) { + desc->cfg |= SOLO_P2M_EXT_INC(ext_size >> 2); + desc->ctrl |= SOLO_P2M_PCI_INC(size >> 2) | + SOLO_P2M_REPEAT(repeat); + } + + desc->dma_addr = dma_addr; + desc->ext_addr = ext_addr; +} + +int solo_p2m_dma_t(struct solo_dev *solo_dev, int wr, + dma_addr_t dma_addr, u32 ext_addr, u32 size, + int repeat, u32 ext_size) +{ + struct solo_p2m_desc desc[2]; + + solo_p2m_fill_desc(&desc[1], wr, dma_addr, ext_addr, size, repeat, + ext_size); + + /* No need for desc_dma since we know it is a single-shot */ + return solo_p2m_dma_desc(solo_dev, desc, 0, 1); +} + +void solo_p2m_isr(struct solo_dev *solo_dev, int id) +{ + struct solo_p2m_dev *p2m_dev = &solo_dev->p2m_dev[id]; + struct solo_p2m_desc *desc; + + if (p2m_dev->desc_count <= p2m_dev->desc_idx) { + complete(&p2m_dev->completion); + return; + } + + /* Setup next descriptor */ + p2m_dev->desc_idx++; + desc = &p2m_dev->descs[p2m_dev->desc_idx]; + + solo_reg_write(solo_dev, SOLO_P2M_CONTROL(id), 0); + solo_reg_write(solo_dev, SOLO_P2M_TAR_ADR(id), desc->dma_addr); + solo_reg_write(solo_dev, SOLO_P2M_EXT_ADR(id), desc->ext_addr); + solo_reg_write(solo_dev, SOLO_P2M_EXT_CFG(id), desc->cfg); + solo_reg_write(solo_dev, SOLO_P2M_CONTROL(id), desc->ctrl); +} + +void solo_p2m_error_isr(struct solo_dev *solo_dev) +{ + unsigned int err = solo_reg_read(solo_dev, SOLO_PCI_ERR); + struct solo_p2m_dev *p2m_dev; + int i; + + if (!(err & (SOLO_PCI_ERR_P2M | SOLO_PCI_ERR_P2M_DESC))) + return; + + for (i = 0; i < SOLO_NR_P2M; i++) { + p2m_dev = &solo_dev->p2m_dev[i]; + p2m_dev->error = 1; + solo_reg_write(solo_dev, SOLO_P2M_CONTROL(i), 0); + complete(&p2m_dev->completion); + } +} + +void solo_p2m_exit(struct solo_dev *solo_dev) +{ + int i; + + for (i = 0; i < SOLO_NR_P2M; i++) + solo_irq_off(solo_dev, SOLO_IRQ_P2M(i)); +} + +static int solo_p2m_test(struct solo_dev *solo_dev, int base, int size) +{ + u32 *wr_buf; + u32 *rd_buf; + int i; + int ret = -EIO; + int order = get_order(size); + + wr_buf = (u32 *)__get_free_pages(GFP_KERNEL, order); + if (wr_buf == NULL) + return -1; + + rd_buf = (u32 *)__get_free_pages(GFP_KERNEL, order); + if (rd_buf == NULL) { + free_pages((unsigned long)wr_buf, order); + return -1; + } + + for (i = 0; i < (size >> 3); i++) + *(wr_buf + i) = (i << 16) | (i + 1); + + for (i = (size >> 3); i < (size >> 2); i++) + *(wr_buf + i) = ~((i << 16) | (i + 1)); + + memset(rd_buf, 0x55, size); + + if (solo_p2m_dma(solo_dev, 1, wr_buf, base, size, 0, 0)) + goto test_fail; + + if (solo_p2m_dma(solo_dev, 0, rd_buf, base, size, 0, 0)) + goto test_fail; + + for (i = 0; i < (size >> 2); i++) { + if (*(wr_buf + i) != *(rd_buf + i)) + goto test_fail; + } + + ret = 0; + +test_fail: + free_pages((unsigned long)wr_buf, order); + free_pages((unsigned long)rd_buf, order); + + return ret; +} + +int solo_p2m_init(struct solo_dev *solo_dev) +{ + struct solo_p2m_dev *p2m_dev; + int i; + + for (i = 0; i < SOLO_NR_P2M; i++) { + p2m_dev = &solo_dev->p2m_dev[i]; + + mutex_init(&p2m_dev->mutex); + init_completion(&p2m_dev->completion); + + solo_reg_write(solo_dev, SOLO_P2M_CONTROL(i), 0); + solo_reg_write(solo_dev, SOLO_P2M_CONFIG(i), + SOLO_P2M_CSC_16BIT_565 | + SOLO_P2M_DESC_INTR_OPT | + SOLO_P2M_DMA_INTERVAL(0) | + SOLO_P2M_PCI_MASTER_MODE); + solo_irq_on(solo_dev, SOLO_IRQ_P2M(i)); + } + + /* Find correct SDRAM size */ + for (solo_dev->sdram_size = 0, i = 2; i >= 0; i--) { + solo_reg_write(solo_dev, SOLO_DMA_CTRL, + SOLO_DMA_CTRL_REFRESH_CYCLE(1) | + SOLO_DMA_CTRL_SDRAM_SIZE(i) | + SOLO_DMA_CTRL_SDRAM_CLK_INVERT | + SOLO_DMA_CTRL_READ_CLK_SELECT | + SOLO_DMA_CTRL_LATENCY(1)); + + solo_reg_write(solo_dev, SOLO_SYS_CFG, solo_dev->sys_config | + SOLO_SYS_CFG_RESET); + solo_reg_write(solo_dev, SOLO_SYS_CFG, solo_dev->sys_config); + + switch (i) { + case 2: + if (solo_p2m_test(solo_dev, 0x07ff0000, 0x00010000) || + solo_p2m_test(solo_dev, 0x05ff0000, 0x00010000)) + continue; + break; + + case 1: + if (solo_p2m_test(solo_dev, 0x03ff0000, 0x00010000)) + continue; + break; + + default: + if (solo_p2m_test(solo_dev, 0x01ff0000, 0x00010000)) + continue; + } + + solo_dev->sdram_size = (32 << 20) << i; + break; + } + + if (!solo_dev->sdram_size) { + dev_err(&solo_dev->pdev->dev, "Error detecting SDRAM size\n"); + return -EIO; + } + + if (SOLO_SDRAM_END(solo_dev) > solo_dev->sdram_size) { + dev_err(&solo_dev->pdev->dev, + "SDRAM is not large enough (%u < %u)\n", + solo_dev->sdram_size, SOLO_SDRAM_END(solo_dev)); + return -EIO; + } + + return 0; +} |