David Vrabel | 7e6133a | 2008-09-17 16:34:28 +0100 | [diff] [blame] | 1 | /* |
| 2 | * Wireless Host Controller (WHC) hardware access helpers. |
| 3 | * |
| 4 | * Copyright (C) 2007 Cambridge Silicon Radio Ltd. |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or |
| 7 | * modify it under the terms of the GNU General Public License version |
| 8 | * 2 as published by the Free Software Foundation. |
| 9 | * |
| 10 | * This program is distributed in the hope that it will be useful, |
| 11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 13 | * GNU General Public License for more details. |
| 14 | * |
| 15 | * You should have received a copy of the GNU General Public License |
| 16 | * along with this program. If not, see <http://www.gnu.org/licenses/>. |
| 17 | */ |
| 18 | #include <linux/kernel.h> |
| 19 | #include <linux/dma-mapping.h> |
| 20 | #include <linux/uwb/umc.h> |
| 21 | |
| 22 | #include "../../wusbcore/wusbhc.h" |
| 23 | |
| 24 | #include "whcd.h" |
| 25 | |
| 26 | void whc_write_wusbcmd(struct whc *whc, u32 mask, u32 val) |
| 27 | { |
| 28 | unsigned long flags; |
| 29 | u32 cmd; |
| 30 | |
| 31 | spin_lock_irqsave(&whc->lock, flags); |
| 32 | |
| 33 | cmd = le_readl(whc->base + WUSBCMD); |
| 34 | cmd = (cmd & ~mask) | val; |
| 35 | le_writel(cmd, whc->base + WUSBCMD); |
| 36 | |
| 37 | spin_unlock_irqrestore(&whc->lock, flags); |
| 38 | } |
| 39 | |
| 40 | /** |
| 41 | * whc_do_gencmd - start a generic command via the WUSBGENCMDSTS register |
| 42 | * @whc: the WHCI HC |
| 43 | * @cmd: command to start. |
| 44 | * @params: parameters for the command (the WUSBGENCMDPARAMS register value). |
| 45 | * @addr: pointer to any data for the command (may be NULL). |
| 46 | * @len: length of the data (if any). |
| 47 | */ |
| 48 | int whc_do_gencmd(struct whc *whc, u32 cmd, u32 params, void *addr, size_t len) |
| 49 | { |
| 50 | unsigned long flags; |
| 51 | dma_addr_t dma_addr; |
| 52 | int t; |
David Vrabel | b09ac64 | 2008-10-27 15:14:03 +0000 | [diff] [blame] | 53 | int ret = 0; |
David Vrabel | 7e6133a | 2008-09-17 16:34:28 +0100 | [diff] [blame] | 54 | |
| 55 | mutex_lock(&whc->mutex); |
| 56 | |
| 57 | /* Wait for previous command to complete. */ |
| 58 | t = wait_event_timeout(whc->cmd_wq, |
| 59 | (le_readl(whc->base + WUSBGENCMDSTS) & WUSBGENCMDSTS_ACTIVE) == 0, |
| 60 | WHC_GENCMD_TIMEOUT_MS); |
| 61 | if (t == 0) { |
| 62 | dev_err(&whc->umc->dev, "generic command timeout (%04x/%04x)\n", |
| 63 | le_readl(whc->base + WUSBGENCMDSTS), |
| 64 | le_readl(whc->base + WUSBGENCMDPARAMS)); |
David Vrabel | b09ac64 | 2008-10-27 15:14:03 +0000 | [diff] [blame] | 65 | ret = -ETIMEDOUT; |
| 66 | goto out; |
David Vrabel | 7e6133a | 2008-09-17 16:34:28 +0100 | [diff] [blame] | 67 | } |
| 68 | |
| 69 | if (addr) { |
| 70 | memcpy(whc->gen_cmd_buf, addr, len); |
| 71 | dma_addr = whc->gen_cmd_buf_dma; |
| 72 | } else |
| 73 | dma_addr = 0; |
| 74 | |
| 75 | /* Poke registers to start cmd. */ |
| 76 | spin_lock_irqsave(&whc->lock, flags); |
| 77 | |
| 78 | le_writel(params, whc->base + WUSBGENCMDPARAMS); |
| 79 | le_writeq(dma_addr, whc->base + WUSBGENADDR); |
| 80 | |
| 81 | le_writel(WUSBGENCMDSTS_ACTIVE | WUSBGENCMDSTS_IOC | cmd, |
| 82 | whc->base + WUSBGENCMDSTS); |
| 83 | |
| 84 | spin_unlock_irqrestore(&whc->lock, flags); |
David Vrabel | b09ac64 | 2008-10-27 15:14:03 +0000 | [diff] [blame] | 85 | out: |
David Vrabel | 7e6133a | 2008-09-17 16:34:28 +0100 | [diff] [blame] | 86 | mutex_unlock(&whc->mutex); |
| 87 | |
David Vrabel | b09ac64 | 2008-10-27 15:14:03 +0000 | [diff] [blame] | 88 | return ret; |
David Vrabel | 7e6133a | 2008-09-17 16:34:28 +0100 | [diff] [blame] | 89 | } |
David Vrabel | a5e6ced | 2009-01-07 10:54:22 +0000 | [diff] [blame] | 90 | |
| 91 | /** |
| 92 | * whc_hw_error - recover from a hardware error |
| 93 | * @whc: the WHCI HC that broke. |
| 94 | * @reason: a description of the failure. |
| 95 | * |
| 96 | * Recover from broken hardware with a full reset. |
| 97 | */ |
| 98 | void whc_hw_error(struct whc *whc, const char *reason) |
| 99 | { |
| 100 | struct wusbhc *wusbhc = &whc->wusbhc; |
| 101 | |
| 102 | dev_err(&whc->umc->dev, "hardware error: %s\n", reason); |
| 103 | wusbhc_reset_all(wusbhc); |
| 104 | } |