| 1 | /* |
| 2 | * Copyright 2010-2017 Intel Corporation. |
| 3 | * |
| 4 | * This program is free software; you can redistribute it and/or modify |
| 5 | * it under the terms of the GNU General Public License, version 2, |
| 6 | * as published by the Free Software Foundation. |
| 7 | * |
| 8 | * This program is distributed in the hope that it will be useful, |
| 9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 11 | * General Public License for more details. |
| 12 | * |
| 13 | * Disclaimer: The codes contained in these modules may be specific to |
| 14 | * the Intel Software Development Platform codenamed Knights Ferry, |
| 15 | * and the Intel product codenamed Knights Corner, and are not backward |
| 16 | * compatible with other Intel products. Additionally, Intel will NOT |
| 17 | * support the codes or instruction set in future products. |
| 18 | * |
| 19 | * Intel offers no warranty of any kind regarding the code. This code is |
| 20 | * licensed on an "AS IS" basis and Intel is not obligated to provide |
| 21 | * any support, assistance, installation, training, or other services |
| 22 | * of any kind. Intel is also not obligated to provide any updates, |
| 23 | * enhancements or extensions. Intel specifically disclaims any warranty |
| 24 | * of merchantability, non-infringement, fitness for any particular |
| 25 | * purpose, and any other warranty. |
| 26 | * |
| 27 | * Further, Intel disclaims all liability of any kind, including but |
| 28 | * not limited to liability for infringement of any proprietary rights, |
| 29 | * relating to the use of the code, even if Intel is notified of the |
| 30 | * possibility of such liability. Except as expressly stated in an Intel |
| 31 | * license agreement provided with this code and agreed upon with Intel, |
| 32 | * no license, express or implied, by estoppel or otherwise, to any |
| 33 | * intellectual property rights is granted herein. |
| 34 | */ |
| 35 | |
| 36 | #include <linux/module.h> |
| 37 | #include <linux/mm.h> |
| 38 | #include "hvc_console.h" |
| 39 | #include <mic/micscif_rb.h> |
| 40 | #include <mic/micvcons.h> |
| 41 | #include <asm/io.h> |
| 42 | #include <linux/errno.h> |
| 43 | #include <linux/hardirq.h> |
| 44 | #include <linux/types.h> |
| 45 | #include <linux/capability.h> |
| 46 | #include <linux/slab.h> |
| 47 | #include <linux/string.h> |
| 48 | #include <linux/gfp.h> |
| 49 | #include <linux/vmalloc.h> |
| 50 | #include <asm/io.h> |
| 51 | #include <linux/kernel.h> |
| 52 | #include <linux/mm_types.h> |
| 53 | #include <linux/jiffies.h> |
| 54 | #include <linux/timer.h> |
| 55 | #include <linux/irqflags.h> |
| 56 | #include <linux/time.h> |
| 57 | #include <linux/spinlock.h> |
| 58 | #include <linux/mutex.h> |
| 59 | #include <linux/semaphore.h> |
| 60 | #include <linux/kthread.h> |
| 61 | #include <linux/sched.h> |
| 62 | #include <linux/delay.h> |
| 63 | #include <linux/wait.h> |
| 64 | #include <asm/bug.h> |
| 65 | #include <linux/pci.h> |
| 66 | #include <linux/device.h> |
| 67 | #include <linux/fs.h> |
| 68 | #include <linux/list.h> |
| 69 | #include <linux/workqueue.h> |
| 70 | #include <linux/interrupt.h> |
| 71 | #include <asm/atomic.h> |
| 72 | #include <linux/netdevice.h> |
| 73 | #include <linux/debugfs.h> |
| 74 | #include <linux/interrupt.h> |
| 75 | #include <asm/mic/mic_common.h> |
| 76 | |
| 77 | #define MIC_COOKIE 0xc0c0 |
| 78 | #define MIC_KNC 1 |
| 79 | |
| 80 | static long vcons_hdr_addr; |
| 81 | static struct micscif_rb mic_out_buf; |
| 82 | static struct micscif_rb mic_in_buf; |
| 83 | |
| 84 | struct vcons_info { |
| 85 | struct vcons_buf *hdr; |
| 86 | struct vcons_mic_header *mic_hdr; |
| 87 | char *vcons_op_buf; |
| 88 | char *vcons_ip_buf; |
| 89 | }; |
| 90 | |
| 91 | static struct vcons_info vcons_info; |
| 92 | static int dbg = 0; |
| 93 | |
| 94 | /* Receive data from the host (mic i/p buffer) */ |
| 95 | static int hvc_mic_get_chars(uint32_t vt, char *buf, int count) |
| 96 | { |
| 97 | int ret, len, get_count; |
| 98 | |
| 99 | len = micscif_rb_count(&mic_in_buf, count); |
| 100 | get_count = min(len, count); |
| 101 | ret = micscif_rb_get_next(&mic_in_buf, buf, get_count); |
| 102 | if (ret == get_count) |
| 103 | micscif_rb_update_read_ptr(&mic_in_buf); |
| 104 | |
| 105 | return ret; |
| 106 | } |
| 107 | |
| 108 | /* Send data to the host (mic o/p buffer) */ |
| 109 | static int hvc_mic_put_chars(uint32_t vt, const char *buf, int count) |
| 110 | { |
| 111 | int ret; |
| 112 | int put_count; |
| 113 | volatile int *host_status = |
| 114 | (volatile int *)&vcons_info.mic_hdr->host_status; |
| 115 | |
| 116 | put_count = min(micscif_rb_space(&mic_out_buf), count); |
| 117 | if (put_count) { |
| 118 | ret = micscif_rb_write(&mic_out_buf, (void *)buf, put_count); |
| 119 | BUG_ON(ret); |
| 120 | micscif_rb_commit(&mic_out_buf); |
| 121 | } else if (*host_status != MIC_VCONS_HOST_OPEN) |
| 122 | return count; |
| 123 | return put_count; |
| 124 | } |
| 125 | |
| 126 | |
| 127 | static irqreturn_t hvc_mic_handle_interrupt(int irq, void *dev_id) |
| 128 | { |
| 129 | struct hvc_struct *hp = (struct hvc_struct *)dev_id; |
| 130 | if (hvc_poll(hp)) { |
| 131 | hvc_kick(); |
| 132 | return IRQ_HANDLED; |
| 133 | } |
| 134 | return IRQ_NONE; |
| 135 | } |
| 136 | |
| 137 | static int hvc_mic_notifier_add_irq(struct hvc_struct *hp, int irq) |
| 138 | { |
| 139 | int ret = request_irq(get_sbox_irq(HVC_SBOX_INT_IDX), |
| 140 | hvc_mic_handle_interrupt, IRQF_DISABLED, |
| 141 | "hvc intr", hp); |
| 142 | if (ret) { |
| 143 | printk("Unable to register interrupt\n"); |
| 144 | return ret; |
| 145 | } |
| 146 | hp->irq_requested = 1; |
| 147 | return 0; |
| 148 | } |
| 149 | |
| 150 | static void hvc_mic_notifier_del_irq(struct hvc_struct *hp, int irq) |
| 151 | { |
| 152 | if (hp->irq_requested) { |
| 153 | free_irq(get_sbox_irq(HVC_SBOX_INT_IDX), hp); |
| 154 | hp->irq_requested = 0; |
| 155 | } |
| 156 | } |
| 157 | |
| 158 | static void hvc_mic_notifier_hangup_irq(struct hvc_struct *hp, int irq) |
| 159 | { |
| 160 | hvc_mic_notifier_del_irq(hp, irq); |
| 161 | } |
| 162 | |
| 163 | static const struct hv_ops hvc_mic_ops = { |
| 164 | .get_chars = hvc_mic_get_chars, |
| 165 | .put_chars = hvc_mic_put_chars, |
| 166 | .notifier_add = hvc_mic_notifier_add_irq, |
| 167 | .notifier_del = hvc_mic_notifier_del_irq, |
| 168 | .notifier_hangup = hvc_mic_notifier_hangup_irq, |
| 169 | }; |
| 170 | |
| 171 | static void dump_vcons_hdr(struct vcons_buf *hdr) |
| 172 | { |
| 173 | printk(KERN_ERR "host_magic\t%x\n", readl(&hdr->host_magic)); |
| 174 | printk(KERN_ERR "mic_magic\t%x\n", readl(&hdr->mic_magic)); |
| 175 | printk(KERN_ERR "o_buf_dma_addr\t%x\n", readl(&hdr->o_buf_dma_addr)); |
| 176 | printk(KERN_ERR "o_wr\t%x\n", readl(&hdr->o_wr)); |
| 177 | printk(KERN_ERR "o_size\t%x\n", readl(&hdr->o_size)); |
| 178 | printk(KERN_ERR "i_hdr_addr\t%lx\n", readq(&hdr->i_hdr_addr)); |
| 179 | printk(KERN_ERR "i_buf_addr\t%lx\n", readq(&hdr->i_buf_addr)); |
| 180 | printk(KERN_ERR "i_rd\t%x\n", readl(&hdr->i_rd)); |
| 181 | } |
| 182 | |
| 183 | static int mic_cons_init(void) |
| 184 | { |
| 185 | int rc; |
| 186 | |
| 187 | if ((rc = hvc_instantiate(MIC_COOKIE, 0, &hvc_mic_ops))) |
| 188 | printk(KERN_ERR "error instantiating hvc console\n"); |
| 189 | |
| 190 | return rc; |
| 191 | } |
| 192 | |
| 193 | static struct hvc_struct *hp; |
| 194 | static int __init hvc_mic_init(void) |
| 195 | { |
| 196 | struct vcons_buf *hdr = NULL; |
| 197 | struct vcons_buf tmp_hdr; |
| 198 | int err = 0; |
| 199 | char *hvc_buf; |
| 200 | u8 card_type=0; |
| 201 | uint16_t host_rb_ver, mic_rb_ver; |
| 202 | |
| 203 | #if defined(CONFIG_MK1OM) |
| 204 | card_type = MIC_KNC; |
| 205 | #endif |
| 206 | hvc_buf = (char *)get_zeroed_page(GFP_KERNEL); |
| 207 | if (!hvc_buf) { |
| 208 | printk(KERN_ERR "unable to allocate vcons buffer\n"); |
| 209 | return -ENOMEM; |
| 210 | } |
| 211 | if (card_type == MIC_KNC) { |
| 212 | vcons_info.vcons_ip_buf = hvc_buf; |
| 213 | vcons_info.mic_hdr = (struct vcons_mic_header *)kzalloc(sizeof(struct vcons_mic_header), GFP_KERNEL); |
| 214 | if (!vcons_info.mic_hdr) { |
| 215 | free_page((unsigned long)hvc_buf); |
| 216 | printk(KERN_ERR "unable to allocate vcons header\n"); |
| 217 | return -ENOMEM; |
| 218 | } |
| 219 | } else { |
| 220 | vcons_info.vcons_ip_buf = hvc_buf + PAGE_SIZE/2; |
| 221 | vcons_info.mic_hdr = (struct vcons_mic_header *)hvc_buf; |
| 222 | } |
| 223 | |
| 224 | vcons_info.hdr = hdr = ioremap_nocache(vcons_hdr_addr, |
| 225 | sizeof(struct vcons_buf)); |
| 226 | if (!hdr) { |
| 227 | printk(KERN_ERR "unable to map vcons header\n"); |
| 228 | err = -ENOMEM; |
| 229 | goto error; |
| 230 | } |
| 231 | |
| 232 | if (dbg) |
| 233 | dump_vcons_hdr(hdr); |
| 234 | |
| 235 | if (readl(&hdr->host_magic) != MIC_HOST_VCONS_READY) { |
| 236 | printk(KERN_ERR "host not ready, giving up\n"); |
| 237 | err = -ENODEV; |
| 238 | goto error; |
| 239 | } |
| 240 | |
| 241 | host_rb_ver = readw(&hdr->host_rb_ver); |
| 242 | mic_rb_ver = micscif_rb_get_version(); |
| 243 | writew(mic_rb_ver, &hdr->mic_rb_ver); |
| 244 | if (host_rb_ver != mic_rb_ver) { |
| 245 | printk(KERN_ERR "Card and host ring buffer versions mismatch."); |
| 246 | printk(KERN_ERR "Card ver: %d, Host ver: %d \n", mic_rb_ver, |
| 247 | host_rb_ver); |
| 248 | writel(MIC_VCONS_RB_VER_ERR, &hdr->mic_magic); |
| 249 | err = -ENXIO; |
| 250 | goto error; |
| 251 | } |
| 252 | memcpy_fromio(&tmp_hdr, hdr, sizeof(struct vcons_buf)); |
| 253 | |
| 254 | if (!(vcons_info.vcons_op_buf = ioremap_nocache(tmp_hdr.o_buf_dma_addr, |
| 255 | tmp_hdr.o_size))) { |
| 256 | printk(KERN_ERR "unable to map vcons output buffer\n"); |
| 257 | err = -ENOMEM; |
| 258 | goto error; |
| 259 | } |
| 260 | |
| 261 | tmp_hdr.i_hdr_addr = virt_to_phys(vcons_info.mic_hdr); |
| 262 | tmp_hdr.i_buf_addr = virt_to_phys(vcons_info.vcons_ip_buf); |
| 263 | |
| 264 | if (card_type == MIC_KNC) |
| 265 | tmp_hdr.i_size = PAGE_SIZE; |
| 266 | else |
| 267 | tmp_hdr.i_size = PAGE_SIZE/2; |
| 268 | |
| 269 | micscif_rb_init(&mic_out_buf, (volatile uint32_t *)&vcons_info.mic_hdr->o_rd, |
| 270 | (volatile uint32_t *)&hdr->o_wr, |
| 271 | (volatile uint32_t *)vcons_info.vcons_op_buf, |
| 272 | tmp_hdr.o_size); |
| 273 | |
| 274 | micscif_rb_init(&mic_in_buf, |
| 275 | (volatile uint32_t *)&hdr->i_rd, |
| 276 | (volatile uint32_t *)&vcons_info.mic_hdr->i_wr, |
| 277 | (volatile uint32_t *)vcons_info.vcons_ip_buf, |
| 278 | tmp_hdr.i_size); |
| 279 | |
| 280 | mic_cons_init(); |
| 281 | hp = hvc_alloc(MIC_COOKIE, 2, &hvc_mic_ops, 128); |
| 282 | |
| 283 | if (IS_ERR(hp)) { |
| 284 | printk(KERN_ERR "unable to allocate hvc console\n"); |
| 285 | err = PTR_ERR(hp); |
| 286 | } else { |
| 287 | writeq(tmp_hdr.i_hdr_addr, &hdr->i_hdr_addr); |
| 288 | writeq(tmp_hdr.i_buf_addr, &hdr->i_buf_addr); |
| 289 | writel(tmp_hdr.i_size, &hdr->i_size); |
| 290 | writel(MIC_VCONS_READY, &hdr->mic_magic); |
| 291 | if (dbg) |
| 292 | dump_vcons_hdr(hdr); |
| 293 | |
| 294 | return 0; |
| 295 | } |
| 296 | error: |
| 297 | if (hdr) |
| 298 | iounmap(hdr); |
| 299 | if (vcons_info.vcons_op_buf) |
| 300 | iounmap(vcons_info.vcons_op_buf); |
| 301 | #if defined(CONFIG_MK1OM) |
| 302 | free_page((unsigned long)vcons_info.vcons_ip_buf); |
| 303 | kfree(vcons_info.mic_hdr); |
| 304 | #else |
| 305 | free_page((unsigned long)vcons_info.mic_hdr); |
| 306 | #endif |
| 307 | return err; |
| 308 | } |
| 309 | |
| 310 | static void __exit hvc_mic_exit(void) |
| 311 | { |
| 312 | char buf[8]; |
| 313 | int ret, len; |
| 314 | |
| 315 | writel(0, &vcons_info.hdr->mic_magic); |
| 316 | |
| 317 | do { |
| 318 | len = micscif_rb_count(&mic_in_buf, sizeof(buf)); |
| 319 | ret = micscif_rb_get_next(&mic_in_buf, buf, |
| 320 | min(len, (int)sizeof(buf))); |
| 321 | } while (ret > 0); |
| 322 | |
| 323 | iounmap(vcons_info.hdr); |
| 324 | iounmap(vcons_info.vcons_op_buf); |
| 325 | #if defined(CONFIG_MK1OM) |
| 326 | free_page((unsigned long)vcons_info.vcons_ip_buf); |
| 327 | kfree(vcons_info.mic_hdr); |
| 328 | #else |
| 329 | free_page((unsigned long)vcons_info.mic_hdr); |
| 330 | #endif |
| 331 | if (hp) |
| 332 | hvc_remove(hp); |
| 333 | } |
| 334 | |
| 335 | MODULE_PARM_DESC(vcons_hdr_addr, "mic address of vcons hdr"); |
| 336 | module_param(vcons_hdr_addr, long, S_IRUGO); |
| 337 | module_param(dbg, int, S_IRUGO); |
| 338 | MODULE_LICENSE("GPL"); |
| 339 | module_init(hvc_mic_init); |
| 340 | module_exit(hvc_mic_exit); |
| 341 | |