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authorDan Williams <dan.j.williams@intel.com>2011-09-01 21:18:20 -0700
committerJames Bottomley <JBottomley@Parallels.com>2011-09-22 14:59:09 +0400
commit8ec6552f4a77d15f446b00aed364e3c12d38aa6c (patch)
treeefaa0dfc6479d28a14e5e778e8eb246ff94c360f
parent9c224ac21506d29f5a6ff4df0c4cc9f97484fa25 (diff)
downloadlinux-8ec6552f4a77d15f446b00aed364e3c12d38aa6c.tar.bz2
[SCSI] libsas: sgpio write support
Add SFF-8485 v0.7 / SAS-1 smp-write-gpio register support to libsas. Defer SAS-2 support unless/until it defines an sgpio interface. Minimum implementation needed to get the lights blinking. try_test_sas_gpio_gp_bit() provides a common method to parse the incoming write data (raw bitstream), and the to_sas_gpio_gp_bit() helper routine can be used as a basis for the set/clear operations for the 'read' implementation. Host implementations parse as many bits (ODx.[012]) as are locally supported and report the number of registers successfully written. If the submitted data overruns the internal number of registers available report the write as a success with the number of bytes remaining reported in ->resid_len. Example (assuming an active backplane) set the "identify" pattern for the first 21 devices: smp_write_gpio --count=2 --data=92,49,24,92,24,92,49,24 -t 4 --index=1 /dev/bsg/sas_hostX Signed-off-by: Dan Williams <dan.j.williams@intel.com> Signed-off-by: James Bottomley <JBottomley@Parallels.com>
-rw-r--r--drivers/scsi/libsas/sas_host_smp.c103
-rw-r--r--include/scsi/libsas.h11
-rw-r--r--include/scsi/sas.h8
3 files changed, 120 insertions, 2 deletions
diff --git a/drivers/scsi/libsas/sas_host_smp.c b/drivers/scsi/libsas/sas_host_smp.c
index 04ad8dd1a74c..e1aa17840c5b 100644
--- a/drivers/scsi/libsas/sas_host_smp.c
+++ b/drivers/scsi/libsas/sas_host_smp.c
@@ -51,6 +51,91 @@ static void sas_host_smp_discover(struct sas_ha_struct *sas_ha, u8 *resp_data,
resp_data[15] = rphy->identify.target_port_protocols;
}
+/**
+ * to_sas_gpio_gp_bit - given the gpio frame data find the byte/bit position of 'od'
+ * @od: od bit to find
+ * @data: incoming bitstream (from frame)
+ * @index: requested data register index (from frame)
+ * @count: total number of registers in the bitstream (from frame)
+ * @bit: bit position of 'od' in the returned byte
+ *
+ * returns NULL if 'od' is not in 'data'
+ *
+ * From SFF-8485 v0.7:
+ * "In GPIO_TX[1], bit 0 of byte 3 contains the first bit (i.e., OD0.0)
+ * and bit 7 of byte 0 contains the 32nd bit (i.e., OD10.1).
+ *
+ * In GPIO_TX[2], bit 0 of byte 3 contains the 33rd bit (i.e., OD10.2)
+ * and bit 7 of byte 0 contains the 64th bit (i.e., OD21.0)."
+ *
+ * The general-purpose (raw-bitstream) RX registers have the same layout
+ * although 'od' is renamed 'id' for 'input data'.
+ *
+ * SFF-8489 defines the behavior of the LEDs in response to the 'od' values.
+ */
+static u8 *to_sas_gpio_gp_bit(unsigned int od, u8 *data, u8 index, u8 count, u8 *bit)
+{
+ unsigned int reg;
+ u8 byte;
+
+ /* gp registers start at index 1 */
+ if (index == 0)
+ return NULL;
+
+ index--; /* make index 0-based */
+ if (od < index * 32)
+ return NULL;
+
+ od -= index * 32;
+ reg = od >> 5;
+
+ if (reg >= count)
+ return NULL;
+
+ od &= (1 << 5) - 1;
+ byte = 3 - (od >> 3);
+ *bit = od & ((1 << 3) - 1);
+
+ return &data[reg * 4 + byte];
+}
+
+int try_test_sas_gpio_gp_bit(unsigned int od, u8 *data, u8 index, u8 count)
+{
+ u8 *byte;
+ u8 bit;
+
+ byte = to_sas_gpio_gp_bit(od, data, index, count, &bit);
+ if (!byte)
+ return -1;
+
+ return (*byte >> bit) & 1;
+}
+EXPORT_SYMBOL(try_test_sas_gpio_gp_bit);
+
+static int sas_host_smp_write_gpio(struct sas_ha_struct *sas_ha, u8 *resp_data,
+ u8 reg_type, u8 reg_index, u8 reg_count,
+ u8 *req_data)
+{
+ struct sas_internal *i = to_sas_internal(sas_ha->core.shost->transportt);
+ int written;
+
+ if (i->dft->lldd_write_gpio == NULL) {
+ resp_data[2] = SMP_RESP_FUNC_UNK;
+ return 0;
+ }
+
+ written = i->dft->lldd_write_gpio(sas_ha, reg_type, reg_index,
+ reg_count, req_data);
+
+ if (written < 0) {
+ resp_data[2] = SMP_RESP_FUNC_FAILED;
+ written = 0;
+ } else
+ resp_data[2] = SMP_RESP_FUNC_ACC;
+
+ return written;
+}
+
static void sas_report_phy_sata(struct sas_ha_struct *sas_ha, u8 *resp_data,
u8 phy_id)
{
@@ -230,9 +315,23 @@ int sas_smp_host_handler(struct Scsi_Host *shost, struct request *req,
/* Can't implement; hosts have no routes */
break;
- case SMP_WRITE_GPIO_REG:
- /* FIXME: need GPIO support in the transport class */
+ case SMP_WRITE_GPIO_REG: {
+ /* SFF-8485 v0.7 */
+ const int base_frame_size = 11;
+ int to_write = req_data[4];
+
+ if (blk_rq_bytes(req) < base_frame_size + to_write * 4 ||
+ req->resid_len < base_frame_size + to_write * 4) {
+ resp_data[2] = SMP_RESP_INV_FRM_LEN;
+ break;
+ }
+
+ to_write = sas_host_smp_write_gpio(sas_ha, resp_data, req_data[2],
+ req_data[3], to_write, &req_data[8]);
+ req->resid_len -= base_frame_size + to_write * 4;
+ rsp->resid_len -= 8;
break;
+ }
case SMP_CONF_ROUTE_INFO:
/* Can't implement; hosts have no routes */
diff --git a/include/scsi/libsas.h b/include/scsi/libsas.h
index 2517254b8403..af0a1deac930 100644
--- a/include/scsi/libsas.h
+++ b/include/scsi/libsas.h
@@ -405,6 +405,13 @@ static inline void sas_phy_disconnected(struct asd_sas_phy *phy)
phy->linkrate = SAS_LINK_RATE_UNKNOWN;
}
+static inline unsigned int to_sas_gpio_od(int device, int bit)
+{
+ return 3 * device + bit;
+}
+
+int try_test_sas_gpio_gp_bit(unsigned int od, u8 *data, u8 index, u8 count);
+
/* ---------- Tasks ---------- */
/*
service_response | SAS_TASK_COMPLETE | SAS_TASK_UNDELIVERED |
@@ -592,6 +599,10 @@ struct sas_domain_function_template {
/* Phy management */
int (*lldd_control_phy)(struct asd_sas_phy *, enum phy_func, void *);
+
+ /* GPIO support */
+ int (*lldd_write_gpio)(struct sas_ha_struct *, u8 reg_type,
+ u8 reg_index, u8 reg_count, u8 *write_data);
};
extern int sas_register_ha(struct sas_ha_struct *);
diff --git a/include/scsi/sas.h b/include/scsi/sas.h
index e9fd02281381..a3001add0c66 100644
--- a/include/scsi/sas.h
+++ b/include/scsi/sas.h
@@ -195,6 +195,14 @@ enum sas_open_rej_reason {
SAS_OREJ_RSVD_RETRY = 18,
};
+enum sas_gpio_reg_type {
+ SAS_GPIO_REG_CFG = 0,
+ SAS_GPIO_REG_RX = 1,
+ SAS_GPIO_REG_RX_GP = 2,
+ SAS_GPIO_REG_TX = 3,
+ SAS_GPIO_REG_TX_GP = 4,
+};
+
struct dev_to_host_fis {
u8 fis_type; /* 0x34 */
u8 flags;