1 // SPDX-License-Identifier: GPL-2.0-only
3 * DDR PHY Front End (DPFE) driver for Broadcom set top box SoCs
5 * Copyright (c) 2017 Broadcom
9 * This driver provides access to the DPFE interface of Broadcom STB SoCs.
10 * The firmware running on the DCPU inside the DDR PHY can provide current
11 * information about the system's RAM, for instance the DRAM refresh rate.
12 * This can be used as an indirect indicator for the DRAM's temperature.
13 * Slower refresh rate means cooler RAM, higher refresh rate means hotter
16 * Throughout the driver, we use readl_relaxed() and writel_relaxed(), which
17 * already contain the appropriate le32_to_cpu()/cpu_to_le32() calls.
19 * Note regarding the loading of the firmware image: we use be32_to_cpu()
20 * and le_32_to_cpu(), so we can support the following four cases:
21 * - LE kernel + LE firmware image (the most common case)
22 * - LE kernel + BE firmware image
23 * - BE kernel + LE firmware image
24 * - BE kernel + BE firmware image
26 * The DPCU always runs in big endian mode. The firmware image, however, can
27 * be in either format. Also, communication between host CPU and DCPU is
28 * always in little endian.
31 #include <linux/delay.h>
32 #include <linux/firmware.h>
34 #include <linux/module.h>
36 #include <linux/platform_device.h>
38 #define DRVNAME "brcmstb-dpfe"
40 /* DCPU register offsets */
41 #define REG_DCPU_RESET 0x0
42 #define REG_TO_DCPU_MBOX 0x10
43 #define REG_TO_HOST_MBOX 0x14
45 /* Macros to process offsets returned by the DCPU */
46 #define DRAM_MSG_ADDR_OFFSET 0x0
47 #define DRAM_MSG_TYPE_OFFSET 0x1c
48 #define DRAM_MSG_ADDR_MASK ((1UL << DRAM_MSG_TYPE_OFFSET) - 1)
49 #define DRAM_MSG_TYPE_MASK ((1UL << \
50 (BITS_PER_LONG - DRAM_MSG_TYPE_OFFSET)) - 1)
53 #define DCPU_MSG_RAM_START 0x100
54 #define DCPU_MSG_RAM(x) (DCPU_MSG_RAM_START + (x) * sizeof(u32))
56 /* DRAM Info Offsets & Masks */
57 #define DRAM_INFO_INTERVAL 0x0
58 #define DRAM_INFO_MR4 0x4
59 #define DRAM_INFO_ERROR 0x8
60 #define DRAM_INFO_MR4_MASK 0xff
61 #define DRAM_INFO_MR4_SHIFT 24 /* We need to look at byte 3 */
63 /* DRAM MR4 Offsets & Masks */
64 #define DRAM_MR4_REFRESH 0x0 /* Refresh rate */
65 #define DRAM_MR4_SR_ABORT 0x3 /* Self Refresh Abort */
66 #define DRAM_MR4_PPRE 0x4 /* Post-package repair entry/exit */
67 #define DRAM_MR4_TH_OFFS 0x5 /* Thermal Offset; vendor specific */
68 #define DRAM_MR4_TUF 0x7 /* Temperature Update Flag */
70 #define DRAM_MR4_REFRESH_MASK 0x7
71 #define DRAM_MR4_SR_ABORT_MASK 0x1
72 #define DRAM_MR4_PPRE_MASK 0x1
73 #define DRAM_MR4_TH_OFFS_MASK 0x3
74 #define DRAM_MR4_TUF_MASK 0x1
76 /* DRAM Vendor Offsets & Masks (API v2) */
77 #define DRAM_VENDOR_MR5 0x0
78 #define DRAM_VENDOR_MR6 0x4
79 #define DRAM_VENDOR_MR7 0x8
80 #define DRAM_VENDOR_MR8 0xc
81 #define DRAM_VENDOR_ERROR 0x10
82 #define DRAM_VENDOR_MASK 0xff
83 #define DRAM_VENDOR_SHIFT 24 /* We need to look at byte 3 */
85 /* DRAM Information Offsets & Masks (API v3) */
86 #define DRAM_DDR_INFO_MR4 0x0
87 #define DRAM_DDR_INFO_MR5 0x4
88 #define DRAM_DDR_INFO_MR6 0x8
89 #define DRAM_DDR_INFO_MR7 0xc
90 #define DRAM_DDR_INFO_MR8 0x10
91 #define DRAM_DDR_INFO_ERROR 0x14
92 #define DRAM_DDR_INFO_MASK 0xff
94 /* Reset register bits & masks */
95 #define DCPU_RESET_SHIFT 0x0
96 #define DCPU_RESET_MASK 0x1
97 #define DCPU_CLK_DISABLE_SHIFT 0x2
99 /* DCPU return codes */
100 #define DCPU_RET_ERROR_BIT BIT(31)
101 #define DCPU_RET_SUCCESS 0x1
102 #define DCPU_RET_ERR_HEADER (DCPU_RET_ERROR_BIT | BIT(0))
103 #define DCPU_RET_ERR_INVAL (DCPU_RET_ERROR_BIT | BIT(1))
104 #define DCPU_RET_ERR_CHKSUM (DCPU_RET_ERROR_BIT | BIT(2))
105 #define DCPU_RET_ERR_COMMAND (DCPU_RET_ERROR_BIT | BIT(3))
106 /* This error code is not firmware defined and only used in the driver. */
107 #define DCPU_RET_ERR_TIMEDOUT (DCPU_RET_ERROR_BIT | BIT(4))
110 #define DPFE_BE_MAGIC 0xfe1010fe
111 #define DPFE_LE_MAGIC 0xfe0101fe
114 #define ERR_INVALID_MAGIC -1
115 #define ERR_INVALID_SIZE -2
116 #define ERR_INVALID_CHKSUM -3
119 #define DPFE_MSG_TYPE_COMMAND 1
120 #define DPFE_MSG_TYPE_RESPONSE 2
122 #define DELAY_LOOP_MAX 1000
124 enum dpfe_msg_fields {
129 MSG_FIELD_MAX = 16 /* Max number of arguments */
134 DPFE_CMD_GET_REFRESH,
136 DPFE_CMD_MAX /* Last entry */
140 * Format of the binary firmware file:
144 * value: 0xfe0101fe <== little endian
145 * 0xfe1010fe <== big endian
147 * [31:16] total segments on this build
148 * [15:0] this segment sequence.
154 * last checksum ==> sum of everything
156 struct dpfe_firmware_header {
164 /* Things we only need during initialization. */
166 unsigned int dmem_len;
167 unsigned int imem_len;
172 /* API version and corresponding commands */
176 const struct attribute_group **sysfs_attrs;
177 u32 command[DPFE_CMD_MAX][MSG_FIELD_MAX];
180 /* Things we need for as long as we are active. */
181 struct brcmstb_dpfe_priv {
186 const struct dpfe_api *dpfe_api;
191 * Forward declaration of our sysfs attribute functions, so we can declare the
192 * attribute data structures early.
194 static ssize_t show_info(struct device *, struct device_attribute *, char *);
195 static ssize_t show_refresh(struct device *, struct device_attribute *, char *);
196 static ssize_t store_refresh(struct device *, struct device_attribute *,
197 const char *, size_t);
198 static ssize_t show_vendor(struct device *, struct device_attribute *, char *);
199 static ssize_t show_dram(struct device *, struct device_attribute *, char *);
202 * Declare our attributes early, so they can be referenced in the API data
203 * structure. We need to do this, because the attributes depend on the API
206 static DEVICE_ATTR(dpfe_info, 0444, show_info, NULL);
207 static DEVICE_ATTR(dpfe_refresh, 0644, show_refresh, store_refresh);
208 static DEVICE_ATTR(dpfe_vendor, 0444, show_vendor, NULL);
209 static DEVICE_ATTR(dpfe_dram, 0444, show_dram, NULL);
211 /* API v2 sysfs attributes */
212 static struct attribute *dpfe_v2_attrs[] = {
213 &dev_attr_dpfe_info.attr,
214 &dev_attr_dpfe_refresh.attr,
215 &dev_attr_dpfe_vendor.attr,
218 ATTRIBUTE_GROUPS(dpfe_v2);
220 /* API v3 sysfs attributes */
221 static struct attribute *dpfe_v3_attrs[] = {
222 &dev_attr_dpfe_info.attr,
223 &dev_attr_dpfe_dram.attr,
226 ATTRIBUTE_GROUPS(dpfe_v3);
229 * Old API v2 firmware commands, as defined in the rev 0.61 specification, we
230 * use a version set to 1 to denote that it is not compatible with the new API
233 static const struct dpfe_api dpfe_api_old_v2 = {
235 .fw_name = "dpfe.bin",
236 .sysfs_attrs = dpfe_v2_groups,
238 [DPFE_CMD_GET_INFO] = {
239 [MSG_HEADER] = DPFE_MSG_TYPE_COMMAND,
244 [DPFE_CMD_GET_REFRESH] = {
245 [MSG_HEADER] = DPFE_MSG_TYPE_COMMAND,
250 [DPFE_CMD_GET_VENDOR] = {
251 [MSG_HEADER] = DPFE_MSG_TYPE_COMMAND,
260 * API v2 firmware commands, as defined in the rev 0.8 specification, named new
263 static const struct dpfe_api dpfe_api_new_v2 = {
265 .fw_name = NULL, /* We expect the firmware to have been downloaded! */
266 .sysfs_attrs = dpfe_v2_groups,
268 [DPFE_CMD_GET_INFO] = {
269 [MSG_HEADER] = DPFE_MSG_TYPE_COMMAND,
270 [MSG_COMMAND] = 0x101,
272 [DPFE_CMD_GET_REFRESH] = {
273 [MSG_HEADER] = DPFE_MSG_TYPE_COMMAND,
274 [MSG_COMMAND] = 0x201,
276 [DPFE_CMD_GET_VENDOR] = {
277 [MSG_HEADER] = DPFE_MSG_TYPE_COMMAND,
278 [MSG_COMMAND] = 0x202,
283 /* API v3 firmware commands */
284 static const struct dpfe_api dpfe_api_v3 = {
286 .fw_name = NULL, /* We expect the firmware to have been downloaded! */
287 .sysfs_attrs = dpfe_v3_groups,
289 [DPFE_CMD_GET_INFO] = {
290 [MSG_HEADER] = DPFE_MSG_TYPE_COMMAND,
291 [MSG_COMMAND] = 0x0101,
295 [DPFE_CMD_GET_REFRESH] = {
296 [MSG_HEADER] = DPFE_MSG_TYPE_COMMAND,
297 [MSG_COMMAND] = 0x0202,
300 /* There's no GET_VENDOR command in API v3. */
304 static const char *get_error_text(unsigned int i)
306 static const char * const error_text[] = {
307 "Success", "Header code incorrect",
308 "Unknown command or argument", "Incorrect checksum",
309 "Malformed command", "Timed out", "Unknown error",
312 if (unlikely(i >= ARRAY_SIZE(error_text)))
313 i = ARRAY_SIZE(error_text) - 1;
315 return error_text[i];
318 static bool is_dcpu_enabled(struct brcmstb_dpfe_priv *priv)
322 mutex_lock(&priv->lock);
323 val = readl_relaxed(priv->regs + REG_DCPU_RESET);
324 mutex_unlock(&priv->lock);
326 return !(val & DCPU_RESET_MASK);
329 static void __disable_dcpu(struct brcmstb_dpfe_priv *priv)
333 if (!is_dcpu_enabled(priv))
336 mutex_lock(&priv->lock);
338 /* Put DCPU in reset if it's running. */
339 val = readl_relaxed(priv->regs + REG_DCPU_RESET);
340 val |= (1 << DCPU_RESET_SHIFT);
341 writel_relaxed(val, priv->regs + REG_DCPU_RESET);
343 mutex_unlock(&priv->lock);
346 static void __enable_dcpu(struct brcmstb_dpfe_priv *priv)
348 void __iomem *regs = priv->regs;
351 mutex_lock(&priv->lock);
353 /* Clear mailbox registers. */
354 writel_relaxed(0, regs + REG_TO_DCPU_MBOX);
355 writel_relaxed(0, regs + REG_TO_HOST_MBOX);
357 /* Disable DCPU clock gating */
358 val = readl_relaxed(regs + REG_DCPU_RESET);
359 val &= ~(1 << DCPU_CLK_DISABLE_SHIFT);
360 writel_relaxed(val, regs + REG_DCPU_RESET);
362 /* Take DCPU out of reset */
363 val = readl_relaxed(regs + REG_DCPU_RESET);
364 val &= ~(1 << DCPU_RESET_SHIFT);
365 writel_relaxed(val, regs + REG_DCPU_RESET);
367 mutex_unlock(&priv->lock);
370 static unsigned int get_msg_chksum(const u32 msg[], unsigned int max)
372 unsigned int sum = 0;
375 /* Don't include the last field in the checksum. */
376 for (i = 0; i < max; i++)
382 static void __iomem *get_msg_ptr(struct brcmstb_dpfe_priv *priv, u32 response,
383 char *buf, ssize_t *size)
385 unsigned int msg_type;
387 void __iomem *ptr = NULL;
389 /* There is no need to use this function for API v3 or later. */
390 if (unlikely(priv->dpfe_api->version >= 3))
393 msg_type = (response >> DRAM_MSG_TYPE_OFFSET) & DRAM_MSG_TYPE_MASK;
394 offset = (response >> DRAM_MSG_ADDR_OFFSET) & DRAM_MSG_ADDR_MASK;
397 * msg_type == 1: the offset is relative to the message RAM
398 * msg_type == 0: the offset is relative to the data RAM (this is the
399 * previous way of passing data)
400 * msg_type is anything else: there's critical hardware problem
404 ptr = priv->regs + DCPU_MSG_RAM_START + offset;
407 ptr = priv->dmem + offset;
410 dev_emerg(priv->dev, "invalid message reply from DCPU: %#x\n",
414 "FATAL: communication error with DCPU\n");
420 static void __finalize_command(struct brcmstb_dpfe_priv *priv)
422 unsigned int release_mbox;
425 * It depends on the API version which MBOX register we have to write to
426 * signal we are done.
428 release_mbox = (priv->dpfe_api->version < 2)
429 ? REG_TO_HOST_MBOX : REG_TO_DCPU_MBOX;
430 writel_relaxed(0, priv->regs + release_mbox);
433 static int __send_command(struct brcmstb_dpfe_priv *priv, unsigned int cmd,
436 void __iomem *regs = priv->regs;
437 unsigned int i, chksum, chksum_idx;
442 if (cmd >= DPFE_CMD_MAX)
445 msg = priv->dpfe_api->command[cmd];
447 mutex_lock(&priv->lock);
449 /* Wait for DCPU to become ready */
450 for (i = 0; i < DELAY_LOOP_MAX; i++) {
451 resp = readl_relaxed(regs + REG_TO_HOST_MBOX);
457 mutex_unlock(&priv->lock);
458 return -ffs(DCPU_RET_ERR_TIMEDOUT);
461 /* Compute checksum over the message */
462 chksum_idx = msg[MSG_ARG_COUNT] + MSG_ARG_COUNT + 1;
463 chksum = get_msg_chksum(msg, chksum_idx);
465 /* Write command and arguments to message area */
466 for (i = 0; i < MSG_FIELD_MAX; i++) {
468 writel_relaxed(chksum, regs + DCPU_MSG_RAM(i));
470 writel_relaxed(msg[i], regs + DCPU_MSG_RAM(i));
473 /* Tell DCPU there is a command waiting */
474 writel_relaxed(1, regs + REG_TO_DCPU_MBOX);
476 /* Wait for DCPU to process the command */
477 for (i = 0; i < DELAY_LOOP_MAX; i++) {
478 /* Read response code */
479 resp = readl_relaxed(regs + REG_TO_HOST_MBOX);
485 if (i == DELAY_LOOP_MAX) {
486 resp = (DCPU_RET_ERR_TIMEDOUT & ~DCPU_RET_ERROR_BIT);
489 /* Read response data */
490 for (i = 0; i < MSG_FIELD_MAX; i++)
491 result[i] = readl_relaxed(regs + DCPU_MSG_RAM(i));
492 chksum_idx = result[MSG_ARG_COUNT] + MSG_ARG_COUNT + 1;
495 /* Tell DCPU we are done */
496 __finalize_command(priv);
498 mutex_unlock(&priv->lock);
503 /* Verify response */
504 chksum = get_msg_chksum(result, chksum_idx);
505 if (chksum != result[chksum_idx])
506 resp = DCPU_RET_ERR_CHKSUM;
508 if (resp != DCPU_RET_SUCCESS) {
509 resp &= ~DCPU_RET_ERROR_BIT;
516 /* Ensure that the firmware file loaded meets all the requirements. */
517 static int __verify_firmware(struct init_data *init,
518 const struct firmware *fw)
520 const struct dpfe_firmware_header *header = (void *)fw->data;
521 unsigned int dmem_size, imem_size, total_size;
522 bool is_big_endian = false;
523 const u32 *chksum_ptr;
525 if (header->magic == DPFE_BE_MAGIC)
526 is_big_endian = true;
527 else if (header->magic != DPFE_LE_MAGIC)
528 return ERR_INVALID_MAGIC;
531 dmem_size = be32_to_cpu(header->dmem_size);
532 imem_size = be32_to_cpu(header->imem_size);
534 dmem_size = le32_to_cpu(header->dmem_size);
535 imem_size = le32_to_cpu(header->imem_size);
538 /* Data and instruction sections are 32 bit words. */
539 if ((dmem_size % sizeof(u32)) != 0 || (imem_size % sizeof(u32)) != 0)
540 return ERR_INVALID_SIZE;
543 * The header + the data section + the instruction section + the
544 * checksum must be equal to the total firmware size.
546 total_size = dmem_size + imem_size + sizeof(*header) +
548 if (total_size != fw->size)
549 return ERR_INVALID_SIZE;
551 /* The checksum comes at the very end. */
552 chksum_ptr = (void *)fw->data + sizeof(*header) + dmem_size + imem_size;
554 init->is_big_endian = is_big_endian;
555 init->dmem_len = dmem_size;
556 init->imem_len = imem_size;
557 init->chksum = (is_big_endian)
558 ? be32_to_cpu(*chksum_ptr) : le32_to_cpu(*chksum_ptr);
563 /* Verify checksum by reading back the firmware from co-processor RAM. */
564 static int __verify_fw_checksum(struct init_data *init,
565 struct brcmstb_dpfe_priv *priv,
566 const struct dpfe_firmware_header *header,
569 u32 magic, sequence, version, sum;
570 u32 __iomem *dmem = priv->dmem;
571 u32 __iomem *imem = priv->imem;
574 if (init->is_big_endian) {
575 magic = be32_to_cpu(header->magic);
576 sequence = be32_to_cpu(header->sequence);
577 version = be32_to_cpu(header->version);
579 magic = le32_to_cpu(header->magic);
580 sequence = le32_to_cpu(header->sequence);
581 version = le32_to_cpu(header->version);
584 sum = magic + sequence + version + init->dmem_len + init->imem_len;
586 for (i = 0; i < init->dmem_len / sizeof(u32); i++)
587 sum += readl_relaxed(dmem + i);
589 for (i = 0; i < init->imem_len / sizeof(u32); i++)
590 sum += readl_relaxed(imem + i);
592 return (sum == checksum) ? 0 : -1;
595 static int __write_firmware(u32 __iomem *mem, const u32 *fw,
596 unsigned int size, bool is_big_endian)
600 /* Convert size to 32-bit words. */
603 /* It is recommended to clear the firmware area first. */
604 for (i = 0; i < size; i++)
605 writel_relaxed(0, mem + i);
609 for (i = 0; i < size; i++)
610 writel_relaxed(be32_to_cpu(fw[i]), mem + i);
612 for (i = 0; i < size; i++)
613 writel_relaxed(le32_to_cpu(fw[i]), mem + i);
619 static int brcmstb_dpfe_download_firmware(struct brcmstb_dpfe_priv *priv)
621 const struct dpfe_firmware_header *header;
622 unsigned int dmem_size, imem_size;
623 struct device *dev = priv->dev;
624 bool is_big_endian = false;
625 const struct firmware *fw;
626 const u32 *dmem, *imem;
627 struct init_data init;
632 * Skip downloading the firmware if the DCPU is already running and
633 * responding to commands.
635 if (is_dcpu_enabled(priv)) {
636 u32 response[MSG_FIELD_MAX];
638 ret = __send_command(priv, DPFE_CMD_GET_INFO, response);
644 * If the firmware filename is NULL it means the boot firmware has to
645 * download the DCPU firmware for us. If that didn't work, we have to
646 * bail, since downloading it ourselves wouldn't work either.
648 if (!priv->dpfe_api->fw_name)
651 ret = firmware_request_nowarn(&fw, priv->dpfe_api->fw_name, dev);
653 * Defer the firmware download if the firmware file couldn't be found.
654 * The root file system may not be available yet.
657 return (ret == -ENOENT) ? -EPROBE_DEFER : ret;
659 ret = __verify_firmware(&init, fw);
665 __disable_dcpu(priv);
667 is_big_endian = init.is_big_endian;
668 dmem_size = init.dmem_len;
669 imem_size = init.imem_len;
671 /* At the beginning of the firmware blob is a header. */
672 header = (struct dpfe_firmware_header *)fw->data;
673 /* Void pointer to the beginning of the actual firmware. */
674 fw_blob = fw->data + sizeof(*header);
675 /* IMEM comes right after the header. */
677 /* DMEM follows after IMEM. */
678 dmem = fw_blob + imem_size;
680 ret = __write_firmware(priv->dmem, dmem, dmem_size, is_big_endian);
683 ret = __write_firmware(priv->imem, imem, imem_size, is_big_endian);
687 ret = __verify_fw_checksum(&init, priv, header, init.chksum);
694 release_firmware(fw);
698 static ssize_t generic_show(unsigned int command, u32 response[],
699 struct brcmstb_dpfe_priv *priv, char *buf)
704 return sprintf(buf, "ERROR: driver private data not set\n");
706 ret = __send_command(priv, command, response);
708 return sprintf(buf, "ERROR: %s\n", get_error_text(-ret));
713 static ssize_t show_info(struct device *dev, struct device_attribute *devattr,
716 u32 response[MSG_FIELD_MAX];
717 struct brcmstb_dpfe_priv *priv;
721 priv = dev_get_drvdata(dev);
722 ret = generic_show(DPFE_CMD_GET_INFO, response, priv, buf);
726 info = response[MSG_ARG0];
728 return sprintf(buf, "%u.%u.%u.%u\n",
735 static ssize_t show_refresh(struct device *dev,
736 struct device_attribute *devattr, char *buf)
738 u32 response[MSG_FIELD_MAX];
740 struct brcmstb_dpfe_priv *priv;
741 u8 refresh, sr_abort, ppre, thermal_offs, tuf;
745 priv = dev_get_drvdata(dev);
746 ret = generic_show(DPFE_CMD_GET_REFRESH, response, priv, buf);
750 info = get_msg_ptr(priv, response[MSG_ARG0], buf, &ret);
754 mr4 = (readl_relaxed(info + DRAM_INFO_MR4) >> DRAM_INFO_MR4_SHIFT) &
757 refresh = (mr4 >> DRAM_MR4_REFRESH) & DRAM_MR4_REFRESH_MASK;
758 sr_abort = (mr4 >> DRAM_MR4_SR_ABORT) & DRAM_MR4_SR_ABORT_MASK;
759 ppre = (mr4 >> DRAM_MR4_PPRE) & DRAM_MR4_PPRE_MASK;
760 thermal_offs = (mr4 >> DRAM_MR4_TH_OFFS) & DRAM_MR4_TH_OFFS_MASK;
761 tuf = (mr4 >> DRAM_MR4_TUF) & DRAM_MR4_TUF_MASK;
763 return sprintf(buf, "%#x %#x %#x %#x %#x %#x %#x\n",
764 readl_relaxed(info + DRAM_INFO_INTERVAL),
765 refresh, sr_abort, ppre, thermal_offs, tuf,
766 readl_relaxed(info + DRAM_INFO_ERROR));
769 static ssize_t store_refresh(struct device *dev, struct device_attribute *attr,
770 const char *buf, size_t count)
772 u32 response[MSG_FIELD_MAX];
773 struct brcmstb_dpfe_priv *priv;
778 if (kstrtoul(buf, 0, &val) < 0)
781 priv = dev_get_drvdata(dev);
782 ret = __send_command(priv, DPFE_CMD_GET_REFRESH, response);
786 info = get_msg_ptr(priv, response[MSG_ARG0], NULL, NULL);
790 writel_relaxed(val, info + DRAM_INFO_INTERVAL);
795 static ssize_t show_vendor(struct device *dev, struct device_attribute *devattr,
798 u32 response[MSG_FIELD_MAX];
799 struct brcmstb_dpfe_priv *priv;
802 u32 mr5, mr6, mr7, mr8, err;
804 priv = dev_get_drvdata(dev);
805 ret = generic_show(DPFE_CMD_GET_VENDOR, response, priv, buf);
809 info = get_msg_ptr(priv, response[MSG_ARG0], buf, &ret);
813 mr5 = (readl_relaxed(info + DRAM_VENDOR_MR5) >> DRAM_VENDOR_SHIFT) &
815 mr6 = (readl_relaxed(info + DRAM_VENDOR_MR6) >> DRAM_VENDOR_SHIFT) &
817 mr7 = (readl_relaxed(info + DRAM_VENDOR_MR7) >> DRAM_VENDOR_SHIFT) &
819 mr8 = (readl_relaxed(info + DRAM_VENDOR_MR8) >> DRAM_VENDOR_SHIFT) &
821 err = readl_relaxed(info + DRAM_VENDOR_ERROR) & DRAM_VENDOR_MASK;
823 return sprintf(buf, "%#x %#x %#x %#x %#x\n", mr5, mr6, mr7, mr8, err);
826 static ssize_t show_dram(struct device *dev, struct device_attribute *devattr,
829 u32 response[MSG_FIELD_MAX];
830 struct brcmstb_dpfe_priv *priv;
832 u32 mr4, mr5, mr6, mr7, mr8, err;
834 priv = dev_get_drvdata(dev);
835 ret = generic_show(DPFE_CMD_GET_REFRESH, response, priv, buf);
839 mr4 = response[MSG_ARG0 + 0] & DRAM_INFO_MR4_MASK;
840 mr5 = response[MSG_ARG0 + 1] & DRAM_DDR_INFO_MASK;
841 mr6 = response[MSG_ARG0 + 2] & DRAM_DDR_INFO_MASK;
842 mr7 = response[MSG_ARG0 + 3] & DRAM_DDR_INFO_MASK;
843 mr8 = response[MSG_ARG0 + 4] & DRAM_DDR_INFO_MASK;
844 err = response[MSG_ARG0 + 5] & DRAM_DDR_INFO_MASK;
846 return sprintf(buf, "%#x %#x %#x %#x %#x %#x\n", mr4, mr5, mr6, mr7,
850 static int brcmstb_dpfe_resume(struct platform_device *pdev)
852 struct brcmstb_dpfe_priv *priv = platform_get_drvdata(pdev);
854 return brcmstb_dpfe_download_firmware(priv);
857 static int brcmstb_dpfe_probe(struct platform_device *pdev)
859 struct device *dev = &pdev->dev;
860 struct brcmstb_dpfe_priv *priv;
863 priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
869 mutex_init(&priv->lock);
870 platform_set_drvdata(pdev, priv);
872 priv->regs = devm_platform_ioremap_resource_byname(pdev, "dpfe-cpu");
873 if (IS_ERR(priv->regs)) {
874 dev_err(dev, "couldn't map DCPU registers\n");
878 priv->dmem = devm_platform_ioremap_resource_byname(pdev, "dpfe-dmem");
879 if (IS_ERR(priv->dmem)) {
880 dev_err(dev, "Couldn't map DCPU data memory\n");
884 priv->imem = devm_platform_ioremap_resource_byname(pdev, "dpfe-imem");
885 if (IS_ERR(priv->imem)) {
886 dev_err(dev, "Couldn't map DCPU instruction memory\n");
890 priv->dpfe_api = of_device_get_match_data(dev);
891 if (unlikely(!priv->dpfe_api)) {
893 * It should be impossible to end up here, but to be safe we
896 dev_err(dev, "Couldn't determine API\n");
900 ret = brcmstb_dpfe_download_firmware(priv);
902 return dev_err_probe(dev, ret, "Couldn't download firmware\n");
904 ret = sysfs_create_groups(&pdev->dev.kobj, priv->dpfe_api->sysfs_attrs);
906 dev_info(dev, "registered with API v%d.\n",
907 priv->dpfe_api->version);
912 static int brcmstb_dpfe_remove(struct platform_device *pdev)
914 struct brcmstb_dpfe_priv *priv = dev_get_drvdata(&pdev->dev);
916 sysfs_remove_groups(&pdev->dev.kobj, priv->dpfe_api->sysfs_attrs);
921 static const struct of_device_id brcmstb_dpfe_of_match[] = {
922 /* Use legacy API v2 for a select number of chips */
923 { .compatible = "brcm,bcm7268-dpfe-cpu", .data = &dpfe_api_old_v2 },
924 { .compatible = "brcm,bcm7271-dpfe-cpu", .data = &dpfe_api_old_v2 },
925 { .compatible = "brcm,bcm7278-dpfe-cpu", .data = &dpfe_api_old_v2 },
926 { .compatible = "brcm,bcm7211-dpfe-cpu", .data = &dpfe_api_new_v2 },
927 /* API v3 is the default going forward */
928 { .compatible = "brcm,dpfe-cpu", .data = &dpfe_api_v3 },
931 MODULE_DEVICE_TABLE(of, brcmstb_dpfe_of_match);
933 static struct platform_driver brcmstb_dpfe_driver = {
936 .of_match_table = brcmstb_dpfe_of_match,
938 .probe = brcmstb_dpfe_probe,
939 .remove = brcmstb_dpfe_remove,
940 .resume = brcmstb_dpfe_resume,
943 module_platform_driver(brcmstb_dpfe_driver);
945 MODULE_AUTHOR("Markus Mayer <mmayer@broadcom.com>");
946 MODULE_DESCRIPTION("BRCMSTB DDR PHY Front End Driver");
947 MODULE_LICENSE("GPL");