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Subject[PATCH v2 4/7] PCI/switchtec: Separate out gen3 register structures into unionse
Since the sys_info and flash_info registers differ significantly in
gen4 hardware, separate out the gen3 registers into their own structure
with a union in the main structure.

No functions changes intended.

Signed-off-by: Logan Gunthorpe <logang@deltatee.com>
---
drivers/pci/switch/switchtec.c | 38 ++++++++++++++++++++++---------
include/linux/switchtec.h | 41 ++++++++++++++++++++++------------
2 files changed, 54 insertions(+), 25 deletions(-)

diff --git a/drivers/pci/switch/switchtec.c b/drivers/pci/switch/switchtec.c
index fe0b7d96c36a..3bdec509f948 100644
--- a/drivers/pci/switch/switchtec.c
+++ b/drivers/pci/switch/switchtec.c
@@ -317,8 +317,12 @@ static ssize_t field ## _show(struct device *dev, \
struct device_attribute *attr, char *buf) \
{ \
struct switchtec_dev *stdev = to_stdev(dev); \
- return io_string_show(buf, &stdev->mmio_sys_info->field, \
- sizeof(stdev->mmio_sys_info->field)); \
+ struct sys_info_regs __iomem *si = stdev->mmio_sys_info; \
+ if (stdev->gen == SWITCHTEC_GEN3) \
+ return io_string_show(buf, &si->gen3.field, \
+ sizeof(si->gen3.field)); \
+ else \
+ return -ENOTSUPP; \
} \
\
static DEVICE_ATTR_RO(field)
@@ -337,8 +341,8 @@ static ssize_t component_vendor_show(struct device *dev,
if (stdev->gen != SWITCHTEC_GEN3)
return sprintf(buf, "none\n");

- return io_string_show(buf, &si->component_vendor,
- sizeof(si->component_vendor));
+ return io_string_show(buf, &si->gen3.component_vendor,
+ sizeof(si->gen3.component_vendor));
}
static DEVICE_ATTR_RO(component_vendor);

@@ -346,7 +350,7 @@ static ssize_t component_id_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct switchtec_dev *stdev = to_stdev(dev);
- int id = ioread16(&stdev->mmio_sys_info->component_id);
+ int id = ioread16(&stdev->mmio_sys_info->gen3.component_id);

/* component_id field not supported after gen3 */
if (stdev->gen != SWITCHTEC_GEN3)
@@ -360,7 +364,7 @@ static ssize_t component_revision_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct switchtec_dev *stdev = to_stdev(dev);
- int rev = ioread8(&stdev->mmio_sys_info->component_revision);
+ int rev = ioread8(&stdev->mmio_sys_info->gen3.component_revision);

/* component_revision field not supported after gen3 */
if (stdev->gen != SWITCHTEC_GEN3)
@@ -596,8 +600,12 @@ static int ioctl_flash_info(struct switchtec_dev *stdev,
struct switchtec_ioctl_flash_info info = {0};
struct flash_info_regs __iomem *fi = stdev->mmio_flash_info;

- info.flash_length = ioread32(&fi->flash_length);
- info.num_partitions = SWITCHTEC_NUM_PARTITIONS_GEN3;
+ if (stdev->gen == SWITCHTEC_GEN3) {
+ info.flash_length = ioread32(&fi->gen3.flash_length);
+ info.num_partitions = SWITCHTEC_NUM_PARTITIONS_GEN3;
+ } else {
+ return -ENOTSUPP;
+ }

if (copy_to_user(uinfo, &info, sizeof(info)))
return -EFAULT;
@@ -615,8 +623,9 @@ static void set_fw_info_part(struct switchtec_ioctl_flash_part_info *info,
static int flash_part_info_gen3(struct switchtec_dev *stdev,
struct switchtec_ioctl_flash_part_info *info)
{
- struct flash_info_regs __iomem *fi = stdev->mmio_flash_info;
- struct sys_info_regs __iomem *si = stdev->mmio_sys_info;
+ struct flash_info_regs_gen3 __iomem *fi =
+ &stdev->mmio_flash_info->gen3;
+ struct sys_info_regs_gen3 __iomem *si = &stdev->mmio_sys_info->gen3;
u32 active_addr = -1;

switch (info->flash_partition) {
@@ -1388,6 +1397,7 @@ static int switchtec_init_pci(struct switchtec_dev *stdev,
int rc;
void __iomem *map;
unsigned long res_start, res_len;
+ u32 __iomem *part_id;

rc = pcim_enable_device(pdev);
if (rc)
@@ -1422,7 +1432,13 @@ static int switchtec_init_pci(struct switchtec_dev *stdev,
stdev->mmio_sys_info = stdev->mmio + SWITCHTEC_GAS_SYS_INFO_OFFSET;
stdev->mmio_flash_info = stdev->mmio + SWITCHTEC_GAS_FLASH_INFO_OFFSET;
stdev->mmio_ntb = stdev->mmio + SWITCHTEC_GAS_NTB_OFFSET;
- stdev->partition = ioread8(&stdev->mmio_sys_info->partition_id);
+
+ if (stdev->gen == SWITCHTEC_GEN3)
+ part_id = &stdev->mmio_sys_info->gen3.partition_id;
+ else
+ return -ENOTSUPP;
+
+ stdev->partition = ioread8(part_id);
stdev->partition_count = ioread8(&stdev->mmio_ntb->partition_count);
stdev->mmio_part_cfg_all = stdev->mmio + SWITCHTEC_GAS_PART_CFG_OFFSET;
stdev->mmio_part_cfg = &stdev->mmio_part_cfg_all[stdev->partition];
diff --git a/include/linux/switchtec.h b/include/linux/switchtec.h
index 5d985947bf82..73817d02db1e 100644
--- a/include/linux/switchtec.h
+++ b/include/linux/switchtec.h
@@ -113,10 +113,7 @@ enum {
SWITCHTEC_GEN3_IMG1_RUNNING = 0x07,
};

-struct sys_info_regs {
- u32 device_id;
- u32 device_version;
- u32 firmware_version;
+struct sys_info_regs_gen3 {
u32 reserved1;
u32 vendor_table_revision;
u32 table_format_version;
@@ -133,26 +130,36 @@ struct sys_info_regs {
u8 component_revision;
} __packed;

-struct flash_info_regs {
+struct sys_info_regs {
+ u32 device_id;
+ u32 device_version;
+ u32 firmware_version;
+ union {
+ struct sys_info_regs_gen3 gen3;
+ };
+} __packed;
+
+struct partition_info {
+ u32 address;
+ u32 length;
+};
+
+struct flash_info_regs_gen3 {
u32 flash_part_map_upd_idx;

- struct active_partition_info {
+ struct active_partition_info_gen3 {
u32 address;
u32 build_version;
u32 build_string;
} active_img;

- struct active_partition_info active_cfg;
- struct active_partition_info inactive_img;
- struct active_partition_info inactive_cfg;
+ struct active_partition_info_gen3 active_cfg;
+ struct active_partition_info_gen3 inactive_img;
+ struct active_partition_info_gen3 inactive_cfg;

u32 flash_length;

- struct partition_info {
- u32 address;
- u32 length;
- } cfg0;
-
+ struct partition_info cfg0;
struct partition_info cfg1;
struct partition_info img0;
struct partition_info img1;
@@ -160,6 +167,12 @@ struct flash_info_regs {
struct partition_info vendor[8];
};

+struct flash_info_regs {
+ union {
+ struct flash_info_regs_gen3 gen3;
+ };
+};
+
enum {
SWITCHTEC_NTB_REG_INFO_OFFSET = 0x0000,
SWITCHTEC_NTB_REG_CTRL_OFFSET = 0x4000,
--
2.20.1
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