cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
Log | Files | Refs | README | LICENSE | sfeed.txt

cx25840-firmware.c (3842B)

      1// SPDX-License-Identifier: GPL-2.0-or-later
      2/* cx25840 firmware functions
      3 */
      4
      5#include <linux/module.h>
      6#include <linux/i2c.h>
      7#include <linux/firmware.h>
      8#include <media/v4l2-common.h>
      9#include <media/drv-intf/cx25840.h>
     10
     11#include "cx25840-core.h"
     12
     13/*
     14 * Mike Isely <isely@pobox.com> - The FWSEND parameter controls the
     15 * size of the firmware chunks sent down the I2C bus to the chip.
     16 * Previously this had been set to 1024 but unfortunately some I2C
     17 * implementations can't transfer data in such big gulps.
     18 * Specifically, the pvrusb2 driver has a hard limit of around 60
     19 * bytes, due to the encapsulation there of I2C traffic into USB
     20 * messages.  So we have to significantly reduce this parameter.
     21 */
     22#define FWSEND 48
     23
     24#define FWDEV(x) &((x)->dev)
     25
     26static char *firmware = "";
     27
     28module_param(firmware, charp, 0444);
     29
     30MODULE_PARM_DESC(firmware, "Firmware image to load");
     31
     32static void start_fw_load(struct i2c_client *client)
     33{
     34	/* DL_ADDR_LB=0 DL_ADDR_HB=0 */
     35	cx25840_write(client, 0x800, 0x00);
     36	cx25840_write(client, 0x801, 0x00);
     37	// DL_MAP=3 DL_AUTO_INC=0 DL_ENABLE=1
     38	cx25840_write(client, 0x803, 0x0b);
     39	/* AUTO_INC_DIS=1 */
     40	cx25840_write(client, 0x000, 0x20);
     41}
     42
     43static void end_fw_load(struct i2c_client *client)
     44{
     45	/* AUTO_INC_DIS=0 */
     46	cx25840_write(client, 0x000, 0x00);
     47	/* DL_ENABLE=0 */
     48	cx25840_write(client, 0x803, 0x03);
     49}
     50
     51#define CX2388x_FIRMWARE "v4l-cx23885-avcore-01.fw"
     52#define CX231xx_FIRMWARE "v4l-cx231xx-avcore-01.fw"
     53#define CX25840_FIRMWARE "v4l-cx25840.fw"
     54
     55static const char *get_fw_name(struct i2c_client *client)
     56{
     57	struct cx25840_state *state = to_state(i2c_get_clientdata(client));
     58
     59	if (firmware[0])
     60		return firmware;
     61	if (is_cx2388x(state))
     62		return CX2388x_FIRMWARE;
     63	if (is_cx231xx(state))
     64		return CX231xx_FIRMWARE;
     65	return CX25840_FIRMWARE;
     66}
     67
     68static int check_fw_load(struct i2c_client *client, int size)
     69{
     70	/* DL_ADDR_HB DL_ADDR_LB */
     71	int s = cx25840_read(client, 0x801) << 8;
     72	s |= cx25840_read(client, 0x800);
     73
     74	if (size != s) {
     75		v4l_err(client, "firmware %s load failed\n",
     76				get_fw_name(client));
     77		return -EINVAL;
     78	}
     79
     80	v4l_info(client, "loaded %s firmware (%d bytes)\n",
     81			get_fw_name(client), size);
     82	return 0;
     83}
     84
     85static int fw_write(struct i2c_client *client, const u8 *data, int size)
     86{
     87	if (i2c_master_send(client, data, size) < size) {
     88		v4l_err(client, "firmware load i2c failure\n");
     89		return -ENOSYS;
     90	}
     91
     92	return 0;
     93}
     94
     95int cx25840_loadfw(struct i2c_client *client)
     96{
     97	struct cx25840_state *state = to_state(i2c_get_clientdata(client));
     98	const struct firmware *fw = NULL;
     99	u8 buffer[FWSEND];
    100	const u8 *ptr;
    101	const char *fwname = get_fw_name(client);
    102	int size, retval;
    103	int max_buf_size = FWSEND;
    104	u32 gpio_oe = 0, gpio_da = 0;
    105
    106	if (is_cx2388x(state)) {
    107		/* Preserve the GPIO OE and output bits */
    108		gpio_oe = cx25840_read(client, 0x160);
    109		gpio_da = cx25840_read(client, 0x164);
    110	}
    111
    112	/* cx231xx cannot accept more than 16 bytes at a time */
    113	if (is_cx231xx(state) && max_buf_size > 16)
    114		max_buf_size = 16;
    115
    116	if (request_firmware(&fw, fwname, FWDEV(client)) != 0) {
    117		v4l_err(client, "unable to open firmware %s\n", fwname);
    118		return -EINVAL;
    119	}
    120
    121	start_fw_load(client);
    122
    123	buffer[0] = 0x08;
    124	buffer[1] = 0x02;
    125
    126	size = fw->size;
    127	ptr = fw->data;
    128	while (size > 0) {
    129		int len = min(max_buf_size - 2, size);
    130
    131		memcpy(buffer + 2, ptr, len);
    132
    133		retval = fw_write(client, buffer, len + 2);
    134
    135		if (retval < 0) {
    136			release_firmware(fw);
    137			return retval;
    138		}
    139
    140		size -= len;
    141		ptr += len;
    142	}
    143
    144	end_fw_load(client);
    145
    146	size = fw->size;
    147	release_firmware(fw);
    148
    149	if (is_cx2388x(state)) {
    150		/* Restore GPIO configuration after f/w load */
    151		cx25840_write(client, 0x160, gpio_oe);
    152		cx25840_write(client, 0x164, gpio_da);
    153	}
    154
    155	return check_fw_load(client, size);
    156}
    157
    158MODULE_FIRMWARE(CX2388x_FIRMWARE);
    159MODULE_FIRMWARE(CX231xx_FIRMWARE);
    160MODULE_FIRMWARE(CX25840_FIRMWARE);
    161