/* Wait for SPI command completion */
static int falcon_spi_wait(struct efx_nic *efx)
{
+ unsigned long timeout = jiffies + DIV_ROUND_UP(HZ, 10);
efx_oword_t reg;
- int cmd_en, timer_active;
- int count;
+ bool cmd_en, timer_active;
- count = 0;
- do {
+ for (;;) {
falcon_read(efx, ®, EE_SPI_HCMD_REG_KER);
cmd_en = EFX_OWORD_FIELD(reg, EE_SPI_HCMD_CMD_EN);
timer_active = EFX_OWORD_FIELD(reg, EE_WR_TIMER_ACTIVE);
if (!cmd_en && !timer_active)
return 0;
- udelay(10);
- } while (++count < 10000); /* wait upto 100msec */
- EFX_ERR(efx, "timed out waiting for SPI\n");
- return -ETIMEDOUT;
+ if (time_after_eq(jiffies, timeout)) {
+ EFX_ERR(efx, "timed out waiting for SPI\n");
+ return -ETIMEDOUT;
+ }
+ cpu_relax();
+ }
}
-static int
-falcon_spi_read(struct efx_nic *efx, int device_id, unsigned int command,
- unsigned int address, unsigned int addr_len,
- void *data, unsigned int len)
+static int falcon_spi_cmd(const struct efx_spi_device *spi,
+ unsigned int command, int address,
+ const void *in, void *out, unsigned int len)
{
+ struct efx_nic *efx = spi->efx;
+ bool addressed = (address >= 0);
+ bool reading = (out != NULL);
efx_oword_t reg;
int rc;
- BUG_ON(len > FALCON_SPI_MAX_LEN);
+ /* Input validation */
+ if (len > FALCON_SPI_MAX_LEN)
+ return -EINVAL;
/* Check SPI not currently being accessed */
rc = falcon_spi_wait(efx);
if (rc)
return rc;
- /* Program address register */
- EFX_POPULATE_OWORD_1(reg, EE_SPI_HADR_ADR, address);
- falcon_write(efx, ®, EE_SPI_HADR_REG_KER);
+ /* Program address register, if we have an address */
+ if (addressed) {
+ EFX_POPULATE_OWORD_1(reg, EE_SPI_HADR_ADR, address);
+ falcon_write(efx, ®, EE_SPI_HADR_REG_KER);
+ }
+
+ /* Program data register, if we have data */
+ if (in != NULL) {
+ memcpy(®, in, len);
+ falcon_write(efx, ®, EE_SPI_HDATA_REG_KER);
+ }
- /* Issue read command */
+ /* Issue read/write command */
EFX_POPULATE_OWORD_7(reg,
EE_SPI_HCMD_CMD_EN, 1,
- EE_SPI_HCMD_SF_SEL, device_id,
+ EE_SPI_HCMD_SF_SEL, spi->device_id,
EE_SPI_HCMD_DABCNT, len,
- EE_SPI_HCMD_READ, EE_SPI_READ,
+ EE_SPI_HCMD_READ, reading,
EE_SPI_HCMD_DUBCNT, 0,
- EE_SPI_HCMD_ADBCNT, addr_len,
+ EE_SPI_HCMD_ADBCNT,
+ (addressed ? spi->addr_len : 0),
EE_SPI_HCMD_ENC, command);
falcon_write(efx, ®, EE_SPI_HCMD_REG_KER);
- /* Wait for read to complete */
+ /* Wait for read/write to complete */
rc = falcon_spi_wait(efx);
if (rc)
return rc;
/* Read data */
- falcon_read(efx, ®, EE_SPI_HDATA_REG_KER);
- memcpy(data, ®, len);
+ if (out != NULL) {
+ falcon_read(efx, ®, EE_SPI_HDATA_REG_KER);
+ memcpy(out, ®, len);
+ }
+
return 0;
}
+static unsigned int
+falcon_spi_write_limit(const struct efx_spi_device *spi, unsigned int start)
+{
+ return min(FALCON_SPI_MAX_LEN,
+ (spi->block_size - (start & (spi->block_size - 1))));
+}
+
+static inline u8
+efx_spi_munge_command(const struct efx_spi_device *spi,
+ const u8 command, const unsigned int address)
+{
+ return command | (((address >> 8) & spi->munge_address) << 3);
+}
+
+
+static int falcon_spi_fast_wait(const struct efx_spi_device *spi)
+{
+ u8 status;
+ int i, rc;
+
+ /* Wait up to 1000us for flash/EEPROM to finish a fast operation. */
+ for (i = 0; i < 50; i++) {
+ udelay(20);
+
+ rc = falcon_spi_cmd(spi, SPI_RDSR, -1, NULL,
+ &status, sizeof(status));
+ if (rc)
+ return rc;
+ if (!(status & SPI_STATUS_NRDY))
+ return 0;
+ }
+ EFX_ERR(spi->efx,
+ "timed out waiting for device %d last status=0x%02x\n",
+ spi->device_id, status);
+ return -ETIMEDOUT;
+}
+
+int falcon_spi_read(const struct efx_spi_device *spi, loff_t start,
+ size_t len, size_t *retlen, u8 *buffer)
+{
+ unsigned int command, block_len, pos = 0;
+ int rc = 0;
+
+ while (pos < len) {
+ block_len = min((unsigned int)len - pos,
+ FALCON_SPI_MAX_LEN);
+
+ command = efx_spi_munge_command(spi, SPI_READ, start + pos);
+ rc = falcon_spi_cmd(spi, command, start + pos, NULL,
+ buffer + pos, block_len);
+ if (rc)
+ break;
+ pos += block_len;
+
+ /* Avoid locking up the system */
+ cond_resched();
+ if (signal_pending(current)) {
+ rc = -EINTR;
+ break;
+ }
+ }
+
+ if (retlen)
+ *retlen = pos;
+ return rc;
+}
+
+int falcon_spi_write(const struct efx_spi_device *spi, loff_t start,
+ size_t len, size_t *retlen, const u8 *buffer)
+{
+ u8 verify_buffer[FALCON_SPI_MAX_LEN];
+ unsigned int command, block_len, pos = 0;
+ int rc = 0;
+
+ while (pos < len) {
+ rc = falcon_spi_cmd(spi, SPI_WREN, -1, NULL, NULL, 0);
+ if (rc)
+ break;
+
+ block_len = min((unsigned int)len - pos,
+ falcon_spi_write_limit(spi, start + pos));
+ command = efx_spi_munge_command(spi, SPI_WRITE, start + pos);
+ rc = falcon_spi_cmd(spi, command, start + pos,
+ buffer + pos, NULL, block_len);
+ if (rc)
+ break;
+
+ rc = falcon_spi_fast_wait(spi);
+ if (rc)
+ break;
+
+ command = efx_spi_munge_command(spi, SPI_READ, start + pos);
+ rc = falcon_spi_cmd(spi, command, start + pos,
+ NULL, verify_buffer, block_len);
+ if (memcmp(verify_buffer, buffer + pos, block_len)) {
+ rc = -EIO;
+ break;
+ }
+
+ pos += block_len;
+
+ /* Avoid locking up the system */
+ cond_resched();
+ if (signal_pending(current)) {
+ rc = -EINTR;
+ break;
+ }
+ }
+
+ if (retlen)
+ *retlen = pos;
+ return rc;
+}
+
/**************************************************************************
*
* MAC wrapper
return -ETIMEDOUT;
}
+static int falcon_spi_device_init(struct efx_nic *efx,
+ struct efx_spi_device **spi_device_ret,
+ unsigned int device_id, u32 device_type)
+{
+ struct efx_spi_device *spi_device;
+
+ if (device_type != 0) {
+ spi_device = kmalloc(sizeof(*spi_device), GFP_KERNEL);
+ if (!spi_device)
+ return -ENOMEM;
+ spi_device->device_id = device_id;
+ spi_device->size =
+ 1 << SPI_DEV_TYPE_FIELD(device_type, SPI_DEV_TYPE_SIZE);
+ spi_device->addr_len =
+ SPI_DEV_TYPE_FIELD(device_type, SPI_DEV_TYPE_ADDR_LEN);
+ spi_device->munge_address = (spi_device->size == 1 << 9 &&
+ spi_device->addr_len == 1);
+ spi_device->block_size =
+ 1 << SPI_DEV_TYPE_FIELD(device_type,
+ SPI_DEV_TYPE_BLOCK_SIZE);
+
+ spi_device->efx = efx;
+ } else {
+ spi_device = NULL;
+ }
+
+ kfree(*spi_device_ret);
+ *spi_device_ret = spi_device;
+ return 0;
+}
+
+
+static void falcon_remove_spi_devices(struct efx_nic *efx)
+{
+ kfree(efx->spi_eeprom);
+ efx->spi_eeprom = NULL;
+ kfree(efx->spi_flash);
+ efx->spi_flash = NULL;
+}
+
/* Extract non-volatile configuration */
static int falcon_probe_nvconfig(struct efx_nic *efx)
{
struct falcon_nvconfig *nvconfig;
- efx_oword_t nic_stat;
- int device_id;
- unsigned addr_len;
- size_t offset, len;
+ struct efx_spi_device *spi;
int magic_num, struct_ver, board_rev;
int rc;
- /* Find the boot device. */
- falcon_read(efx, &nic_stat, NIC_STAT_REG);
- if (EFX_OWORD_FIELD(nic_stat, SF_PRST)) {
- device_id = EE_SPI_FLASH;
- addr_len = 3;
- } else if (EFX_OWORD_FIELD(nic_stat, EE_PRST)) {
- device_id = EE_SPI_EEPROM;
- addr_len = 2;
- } else {
- return -ENODEV;
- }
-
nvconfig = kmalloc(sizeof(*nvconfig), GFP_KERNEL);
+ if (!nvconfig)
+ return -ENOMEM;
/* Read the whole configuration structure into memory. */
- for (offset = 0; offset < sizeof(*nvconfig); offset += len) {
- len = min(sizeof(*nvconfig) - offset,
- (size_t) FALCON_SPI_MAX_LEN);
- rc = falcon_spi_read(efx, device_id, SPI_READ,
- NVCONFIG_BASE + offset, addr_len,
- (char *)nvconfig + offset, len);
- if (rc)
- goto out;
+ spi = efx->spi_flash ? efx->spi_flash : efx->spi_eeprom;
+ rc = falcon_spi_read(spi, NVCONFIG_BASE, sizeof(*nvconfig),
+ NULL, (char *)nvconfig);
+ if (rc) {
+ EFX_ERR(efx, "Failed to read %s\n", efx->spi_flash ? "flash" :
+ "EEPROM");
+ goto fail1;
}
/* Read the MAC addresses */
board_rev = 0;
} else {
struct falcon_nvconfig_board_v2 *v2 = &nvconfig->board_v2;
+ struct falcon_nvconfig_board_v3 *v3 = &nvconfig->board_v3;
efx->phy_type = v2->port0_phy_type;
efx->mii.phy_id = v2->port0_phy_addr;
board_rev = le16_to_cpu(v2->board_revision);
+
+ if (struct_ver >= 3) {
+ __le32 fl = v3->spi_device_type[EE_SPI_FLASH];
+ __le32 ee = v3->spi_device_type[EE_SPI_EEPROM];
+ rc = falcon_spi_device_init(efx, &efx->spi_flash,
+ EE_SPI_FLASH,
+ le32_to_cpu(fl));
+ if (rc)
+ goto fail2;
+ rc = falcon_spi_device_init(efx, &efx->spi_eeprom,
+ EE_SPI_EEPROM,
+ le32_to_cpu(ee));
+ if (rc)
+ goto fail2;
+ }
}
EFX_LOG(efx, "PHY is %d phy_id %d\n", efx->phy_type, efx->mii.phy_id);
efx_set_board_info(efx, board_rev);
- out:
+ kfree(nvconfig);
+ return 0;
+
+ fail2:
+ falcon_remove_spi_devices(efx);
+ fail1:
kfree(nvconfig);
return rc;
}
return 0;
}
+/* Probe all SPI devices on the NIC */
+static void falcon_probe_spi_devices(struct efx_nic *efx)
+{
+ efx_oword_t nic_stat, gpio_ctl, ee_vpd_cfg;
+ bool has_flash, has_eeprom, boot_is_external;
+
+ falcon_read(efx, &gpio_ctl, GPIO_CTL_REG_KER);
+ falcon_read(efx, &nic_stat, NIC_STAT_REG);
+ falcon_read(efx, &ee_vpd_cfg, EE_VPD_CFG_REG_KER);
+
+ has_flash = EFX_OWORD_FIELD(nic_stat, SF_PRST);
+ has_eeprom = EFX_OWORD_FIELD(nic_stat, EE_PRST);
+ boot_is_external = EFX_OWORD_FIELD(gpio_ctl, BOOTED_USING_NVDEVICE);
+
+ if (has_flash) {
+ /* Default flash SPI device: Atmel AT25F1024
+ * 128 KB, 24-bit address, 32 KB erase block,
+ * 256 B write block
+ */
+ u32 flash_device_type =
+ (17 << SPI_DEV_TYPE_SIZE_LBN)
+ | (3 << SPI_DEV_TYPE_ADDR_LEN_LBN)
+ | (0x52 << SPI_DEV_TYPE_ERASE_CMD_LBN)
+ | (15 << SPI_DEV_TYPE_ERASE_SIZE_LBN)
+ | (8 << SPI_DEV_TYPE_BLOCK_SIZE_LBN);
+
+ falcon_spi_device_init(efx, &efx->spi_flash,
+ EE_SPI_FLASH, flash_device_type);
+
+ if (!boot_is_external) {
+ /* Disable VPD and set clock dividers to safe
+ * values for initial programming.
+ */
+ EFX_LOG(efx, "Booted from internal ASIC settings;"
+ " setting SPI config\n");
+ EFX_POPULATE_OWORD_3(ee_vpd_cfg, EE_VPD_EN, 0,
+ /* 125 MHz / 7 ~= 20 MHz */
+ EE_SF_CLOCK_DIV, 7,
+ /* 125 MHz / 63 ~= 2 MHz */
+ EE_EE_CLOCK_DIV, 63);
+ falcon_write(efx, &ee_vpd_cfg, EE_VPD_CFG_REG_KER);
+ }
+ }
+
+ if (has_eeprom) {
+ u32 eeprom_device_type;
+
+ /* If it has no flash, it must have a large EEPROM
+ * for chip config; otherwise check whether 9-bit
+ * addressing is used for VPD configuration
+ */
+ if (has_flash &&
+ (!boot_is_external ||
+ EFX_OWORD_FIELD(ee_vpd_cfg, EE_VPD_EN_AD9_MODE))) {
+ /* Default SPI device: Atmel AT25040 or similar
+ * 512 B, 9-bit address, 8 B write block
+ */
+ eeprom_device_type =
+ (9 << SPI_DEV_TYPE_SIZE_LBN)
+ | (1 << SPI_DEV_TYPE_ADDR_LEN_LBN)
+ | (3 << SPI_DEV_TYPE_BLOCK_SIZE_LBN);
+ } else {
+ /* "Large" SPI device: Atmel AT25640 or similar
+ * 8 KB, 16-bit address, 32 B write block
+ */
+ eeprom_device_type =
+ (13 << SPI_DEV_TYPE_SIZE_LBN)
+ | (2 << SPI_DEV_TYPE_ADDR_LEN_LBN)
+ | (5 << SPI_DEV_TYPE_BLOCK_SIZE_LBN);
+ }
+
+ falcon_spi_device_init(efx, &efx->spi_eeprom,
+ EE_SPI_EEPROM, eeprom_device_type);
+ }
+
+ EFX_LOG(efx, "flash is %s, EEPROM is %s\n",
+ (has_flash ? "present" : "absent"),
+ (has_eeprom ? "present" : "absent"));
+}
+
int falcon_probe_nic(struct efx_nic *efx)
{
struct falcon_nic_data *nic_data;
(unsigned long long)efx->irq_status.dma_addr,
efx->irq_status.addr, virt_to_phys(efx->irq_status.addr));
+ falcon_probe_spi_devices(efx);
+
/* Read in the non-volatile configuration */
rc = falcon_probe_nvconfig(efx);
if (rc)
return 0;
fail5:
+ falcon_remove_spi_devices(efx);
falcon_free_buffer(efx, &efx->irq_status);
fail4:
fail3:
rc = i2c_del_adapter(&efx->i2c_adap);
BUG_ON(rc);
+ falcon_remove_spi_devices(efx);
falcon_free_buffer(efx, &efx->irq_status);
falcon_reset_hw(efx, RESET_TYPE_ALL);
*
*************************************************************************/
-/*
- * Commands common to all known devices.
- *
+#define SPI_WRSR 0x01 /* Write status register */
+#define SPI_WRITE 0x02 /* Write data to memory array */
+#define SPI_READ 0x03 /* Read data from memory array */
+#define SPI_WRDI 0x04 /* Reset write enable latch */
+#define SPI_RDSR 0x05 /* Read status register */
+#define SPI_WREN 0x06 /* Set write enable latch */
+
+#define SPI_STATUS_WPEN 0x80 /* Write-protect pin enabled */
+#define SPI_STATUS_BP2 0x10 /* Block protection bit 2 */
+#define SPI_STATUS_BP1 0x08 /* Block protection bit 1 */
+#define SPI_STATUS_BP0 0x04 /* Block protection bit 0 */
+#define SPI_STATUS_WEN 0x02 /* State of the write enable latch */
+#define SPI_STATUS_NRDY 0x01 /* Device busy flag */
+
+/**
+ * struct efx_spi_device - an Efx SPI (Serial Peripheral Interface) device
+ * @efx: The Efx controller that owns this device
+ * @device_id: Controller's id for the device
+ * @size: Size (in bytes)
+ * @addr_len: Number of address bytes in read/write commands
+ * @munge_address: Flag whether addresses should be munged.
+ * Some devices with 9-bit addresses (e.g. AT25040A EEPROM)
+ * use bit 3 of the command byte as address bit A8, rather
+ * than having a two-byte address. If this flag is set, then
+ * commands should be munged in this way.
+ * @block_size: Write block size (in bytes).
+ * Write commands are limited to blocks with this size and alignment.
+ * @read: Read function for the device
+ * @write: Write function for the device
*/
-
-/* Write status register */
-#define SPI_WRSR 0x01
-
-/* Write data to memory array */
-#define SPI_WRITE 0x02
-
-/* Read data from memory array */
-#define SPI_READ 0x03
-
-/* Reset write enable latch */
-#define SPI_WRDI 0x04
-
-/* Read status register */
-#define SPI_RDSR 0x05
-
-/* Set write enable latch */
-#define SPI_WREN 0x06
-
-/* SST: Enable write to status register */
-#define SPI_SST_EWSR 0x50
-
-/*
- * Status register bits. Not all bits are supported on all devices.
- *
- */
-
-/* Write-protect pin enabled */
-#define SPI_STATUS_WPEN 0x80
-
-/* Block protection bit 2 */
-#define SPI_STATUS_BP2 0x10
-
-/* Block protection bit 1 */
-#define SPI_STATUS_BP1 0x08
-
-/* Block protection bit 0 */
-#define SPI_STATUS_BP0 0x04
-
-/* State of the write enable latch */
-#define SPI_STATUS_WEN 0x02
-
-/* Device busy flag */
-#define SPI_STATUS_NRDY 0x01
+struct efx_spi_device {
+ struct efx_nic *efx;
+ int device_id;
+ unsigned int size;
+ unsigned int addr_len;
+ unsigned int munge_address:1;
+ unsigned int block_size;
+};
+
+int falcon_spi_read(const struct efx_spi_device *spi, loff_t start,
+ size_t len, size_t *retlen, u8 *buffer);
+int falcon_spi_write(const struct efx_spi_device *spi, loff_t start,
+ size_t len, size_t *retlen, const u8 *buffer);
#endif /* EFX_SPI_H */
projects / platform / kernel / linux-3.10.git / commitdiff