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memory: brcmstb: dpfe: prepare support for multiple API versions

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Extend the driver, so it can handle different API versions for
interacting with the DCPU. This is in preparation for the upcoming API
v3.

Signed-off-by: Markus Mayer <mmayer@broadcom.com>
Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
This commit is contained in:
Markus Mayer 2019-04-02 16:01:01 -07:00 committed by Florian Fainelli
parent a7c25759d8
commit 58a8499f43
1 changed files with 59 additions and 28 deletions
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87
drivers/memory/brcmstb_dpfe.c
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@ -35,10 +35,10 @@
#include <linux/io.h>
#include <linux/module.h>
#include <linux/of_address.h>
#include <linux/of_device.h>
#include <linux/platform_device.h>
#define DRVNAME "brcmstb-dpfe"
#define FIRMWARE_NAME "dpfe.bin"
/* DCPU register offsets */
#define REG_DCPU_RESET 0x0
@ -164,12 +164,20 @@ struct init_data {
bool is_big_endian;
};
/* API version and corresponding commands */
struct dpfe_api {
int version;
const char *fw_name;
u32 command[DPFE_CMD_MAX][MSG_FIELD_MAX];
};
/* Things we need for as long as we are active. */
struct private_data {
void __iomem *regs;
void __iomem *dmem;
void __iomem *imem;
struct device *dev;
const struct dpfe_api *dpfe_api;
struct mutex lock;
};
@ -178,29 +186,33 @@ static const char *error_text[] = {
"Incorrect checksum", "Malformed command", "Timed out",
};
/* List of supported firmware commands */
static const u32 dpfe_commands[DPFE_CMD_MAX][MSG_FIELD_MAX] = {
[DPFE_CMD_GET_INFO] = {
[MSG_HEADER] = DPFE_MSG_TYPE_COMMAND,
[MSG_COMMAND] = 1,
[MSG_ARG_COUNT] = 1,
[MSG_ARG0] = 1,
[MSG_CHKSUM] = 4,
},
[DPFE_CMD_GET_REFRESH] = {
[MSG_HEADER] = DPFE_MSG_TYPE_COMMAND,
[MSG_COMMAND] = 2,
[MSG_ARG_COUNT] = 1,
[MSG_ARG0] = 1,
[MSG_CHKSUM] = 5,
},
[DPFE_CMD_GET_VENDOR] = {
[MSG_HEADER] = DPFE_MSG_TYPE_COMMAND,
[MSG_COMMAND] = 2,
[MSG_ARG_COUNT] = 1,
[MSG_ARG0] = 2,
[MSG_CHKSUM] = 6,
},
/* API v2 firmware commands */
static const struct dpfe_api dpfe_api_v2 = {
.version = 2,
.fw_name = "dpfe.bin",
.command = {
[DPFE_CMD_GET_INFO] = {
[MSG_HEADER] = DPFE_MSG_TYPE_COMMAND,
[MSG_COMMAND] = 1,
[MSG_ARG_COUNT] = 1,
[MSG_ARG0] = 1,
[MSG_CHKSUM] = 4,
},
[DPFE_CMD_GET_REFRESH] = {
[MSG_HEADER] = DPFE_MSG_TYPE_COMMAND,
[MSG_COMMAND] = 2,
[MSG_ARG_COUNT] = 1,
[MSG_ARG0] = 1,
[MSG_CHKSUM] = 5,
},
[DPFE_CMD_GET_VENDOR] = {
[MSG_HEADER] = DPFE_MSG_TYPE_COMMAND,
[MSG_COMMAND] = 2,
[MSG_ARG_COUNT] = 1,
[MSG_ARG0] = 2,
[MSG_CHKSUM] = 6,
},
}
};
static bool is_dcpu_enabled(void __iomem *regs)
@ -293,7 +305,7 @@ static void __iomem *get_msg_ptr(struct private_data *priv, u32 response,
static int __send_command(struct private_data *priv, unsigned int cmd,
u32 result[])
{
const u32 *msg = dpfe_commands[cmd];
const u32 *msg = priv->dpfe_api->command[cmd];
void __iomem *regs = priv->regs;
unsigned int i, chksum;
int ret = 0;
@ -492,7 +504,15 @@ static int brcmstb_dpfe_download_firmware(struct platform_device *pdev,
return 0;
}
ret = request_firmware(&fw, FIRMWARE_NAME, dev);
/*
* If the firmware filename is NULL it means the boot firmware has to
* download the DCPU firmware for us. If that didn't work, we have to
* bail, since downloading it ourselves wouldn't work either.
*/
if (!priv->dpfe_api->fw_name)
return -ENODEV;
ret = request_firmware(&fw, priv->dpfe_api->fw_name, dev);
/* request_firmware() prints its own error messages. */
if (ret)
return ret;
@ -714,6 +734,16 @@ static int brcmstb_dpfe_probe(struct platform_device *pdev)
return -ENOENT;
}
priv->dpfe_api = of_device_get_match_data(dev);
if (unlikely(!priv->dpfe_api)) {
/*
* It should be impossible to end up here, but to be safe we
* check anyway.
*/
dev_err(dev, "Couldn't determine API\n");
return -ENOENT;
}
ret = brcmstb_dpfe_download_firmware(pdev, &init);
if (ret) {
dev_err(dev, "Couldn't download firmware -- %d\n", ret);
@ -722,7 +752,8 @@ static int brcmstb_dpfe_probe(struct platform_device *pdev)
ret = sysfs_create_groups(&pdev->dev.kobj, dpfe_groups);
if (!ret)
dev_info(dev, "registered.\n");
dev_info(dev, "registered with API v%d.\n",
priv->dpfe_api->version);
return ret;
}
@ -735,7 +766,7 @@ static int brcmstb_dpfe_remove(struct platform_device *pdev)
}
static const struct of_device_id brcmstb_dpfe_of_match[] = {
{ .compatible = "brcm,dpfe-cpu", },
{ .compatible = "brcm,dpfe-cpu", .data = &dpfe_api_v2 },
{}
};
MODULE_DEVICE_TABLE(of, brcmstb_dpfe_of_match);