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Message-Id: <1288114871-805-4-git-send-email-oakad@yahoo.com>
Date: Wed, 27 Oct 2010 04:41:10 +1100
From: "Alex Dubov" <oakad@...oo.com>
To: "LKML" <linux-kernel@...r.kernel.org>
Cc: "Andrew Morton" <akpm@...ux-foundation.org>,
"Maxim Levitsky" <maximlevitsky@...il.com>,
Alex Dubov <oakad@...oo.com>
Subject: [PATCH 3/4] memstick: factor out transfer initiating functionality in mspro_block.c
From: Alex Dubov <oakad@...oo.com>
Apart from currently used standard memstick data transfer method, Sony
introduced several newer ones, to uncover full bandwidth/capacity of its
Pro, HG and XC media formats. This patch lays a foundation to enable
those methods as made possible by host/media capabilities.
As a side effect of this patch, mspro_block_read_attributes became more
streamlined and readable.
Signed-off-by: Alex Dubov <oakad@...oo.com>
---
drivers/memstick/core/mspro_block.c | 136 +++++++++++++++++++----------------
1 files changed, 74 insertions(+), 62 deletions(-)
diff --git a/drivers/memstick/core/mspro_block.c b/drivers/memstick/core/mspro_block.c
index b11b2b8..ef7679b 100644
--- a/drivers/memstick/core/mspro_block.c
+++ b/drivers/memstick/core/mspro_block.c
@@ -159,6 +159,13 @@ struct mspro_block_data {
int (*mrq_handler)(struct memstick_dev *card,
struct memstick_request **mrq);
+
+ /* Default request setup function for data access method preferred by
+ * this host instance.
+ */
+ void (*setup_transfer)(struct memstick_dev *card,
+ u64 offset, size_t length);
+
struct attribute_group attr_group;
struct scatterlist req_sg[MSPRO_BLOCK_MAX_SEGS];
@@ -656,14 +663,43 @@ has_int_reg:
}
}
+/*** Transfer setup functions for different access methods. ***/
+
+/** Setup data transfer request for SET_CMD TPC with arguments in card
+ * registers.
+ *
+ * @card Current media instance
+ * @offset Target data offset in bytes
+ * @length Required transfer length in bytes.
+ */
+static void h_mspro_block_setup_cmd(struct memstick_dev *card, u64 offset,
+ size_t length)
+{
+ struct mspro_block_data *msb = memstick_get_drvdata(card);
+ struct mspro_param_register param = {
+ .system = msb->system,
+ .data_count = cpu_to_be16((uint16_t)(length / msb->page_size)),
+ /* ISO C90 warning precludes direct initialization for now. */
+ .data_address = 0,
+ .tpc_param = 0
+ };
+
+ do_div(offset, msb->page_size);
+ param.data_address = cpu_to_be32((uint32_t)offset);
+
+ card->next_request = h_mspro_block_req_init;
+ msb->mrq_handler = h_mspro_block_transfer_data;
+ memstick_init_req(&card->current_mrq, MS_TPC_WRITE_REG,
+ ¶m, sizeof(param));
+}
+
/*** Data transfer ***/
static int mspro_block_issue_req(struct memstick_dev *card, int chunk)
{
struct mspro_block_data *msb = memstick_get_drvdata(card);
- sector_t t_sec;
+ u64 t_off;
unsigned int count;
- struct mspro_param_register param;
try_again:
while (chunk) {
@@ -678,30 +714,17 @@ try_again:
continue;
}
- t_sec = blk_rq_pos(msb->block_req) << 9;
- sector_div(t_sec, msb->page_size);
-
+ t_off = blk_rq_pos(msb->block_req);
+ t_off <<= 9;
count = blk_rq_bytes(msb->block_req);
- count /= msb->page_size;
- param.system = msb->system;
- param.data_count = cpu_to_be16(count);
- param.data_address = cpu_to_be32((uint32_t)t_sec);
- param.tpc_param = 0;
+ msb->setup_transfer(card, t_off, count);
msb->data_dir = rq_data_dir(msb->block_req);
msb->transfer_cmd = msb->data_dir == READ
? MSPRO_CMD_READ_DATA
: MSPRO_CMD_WRITE_DATA;
- dev_dbg(&card->dev, "data transfer: cmd %x, "
- "lba %x, count %x\n", msb->transfer_cmd,
- be32_to_cpu(param.data_address), count);
-
- card->next_request = h_mspro_block_req_init;
- msb->mrq_handler = h_mspro_block_transfer_data;
- memstick_init_req(&card->current_mrq, MS_TPC_WRITE_REG,
- ¶m, sizeof(param));
memstick_new_req(card->host);
return 0;
}
@@ -956,18 +979,16 @@ try_again:
static int mspro_block_read_attributes(struct memstick_dev *card)
{
struct mspro_block_data *msb = memstick_get_drvdata(card);
- struct mspro_param_register param = {
- .system = msb->system,
- .data_count = cpu_to_be16(1),
- .data_address = 0,
- .tpc_param = 0
- };
struct mspro_attribute *attr = NULL;
struct mspro_sys_attr *s_attr = NULL;
unsigned char *buffer = NULL;
int cnt, rc, attr_count;
- unsigned int addr;
- unsigned short page_count;
+ /* While normally physical device offsets, represented here by
+ * attr_offset and attr_len will be of large numeric types, we can be
+ * sure, that attributes are close enough to the beginning of the
+ * device, to save ourselves some trouble.
+ */
+ unsigned int addr, attr_offset = 0, attr_len = msb->page_size;
attr = kmalloc(msb->page_size, GFP_KERNEL);
if (!attr)
@@ -980,10 +1001,8 @@ static int mspro_block_read_attributes(struct memstick_dev *card)
msb->data_dir = READ;
msb->transfer_cmd = MSPRO_CMD_READ_ATRB;
- card->next_request = h_mspro_block_req_init;
- msb->mrq_handler = h_mspro_block_transfer_data;
- memstick_init_req(&card->current_mrq, MS_TPC_WRITE_REG, ¶m,
- sizeof(param));
+ msb->setup_transfer(card, attr_offset, attr_len);
+
memstick_new_req(card->host);
wait_for_completion(&card->mrq_complete);
if (card->current_mrq.error) {
@@ -1014,13 +1033,12 @@ static int mspro_block_read_attributes(struct memstick_dev *card)
}
msb->attr_group.name = "media_attributes";
- buffer = kmalloc(msb->page_size, GFP_KERNEL);
+ buffer = kmalloc(attr_len, GFP_KERNEL);
if (!buffer) {
rc = -ENOMEM;
goto out_free_attr;
}
- memcpy(buffer, (char *)attr, msb->page_size);
- page_count = 1;
+ memcpy(buffer, (char *)attr, attr_len);
for (cnt = 0; cnt < attr_count; ++cnt) {
s_attr = kzalloc(sizeof(struct mspro_sys_attr), GFP_KERNEL);
@@ -1031,9 +1049,10 @@ static int mspro_block_read_attributes(struct memstick_dev *card)
msb->attr_group.attrs[cnt] = &s_attr->dev_attr.attr;
addr = be32_to_cpu(attr->entries[cnt].address);
- rc = be32_to_cpu(attr->entries[cnt].size);
+ s_attr->size = be32_to_cpu(attr->entries[cnt].size);
dev_dbg(&card->dev, "adding attribute %d: id %x, address %x, "
- "size %x\n", cnt, attr->entries[cnt].id, addr, rc);
+ "size %x\n", cnt, attr->entries[cnt].id, addr,
+ s_attr->size);
s_attr->id = attr->entries[cnt].id;
if (mspro_block_attr_name(s_attr->id))
snprintf(s_attr->name, sizeof(s_attr->name), "%s",
@@ -1047,57 +1066,47 @@ static int mspro_block_read_attributes(struct memstick_dev *card)
s_attr->dev_attr.attr.mode = S_IRUGO;
s_attr->dev_attr.show = mspro_block_attr_show(s_attr->id);
- if (!rc)
+ if (!s_attr->size)
continue;
- s_attr->size = rc;
- s_attr->data = kmalloc(rc, GFP_KERNEL);
+ s_attr->data = kmalloc(s_attr->size, GFP_KERNEL);
if (!s_attr->data) {
rc = -ENOMEM;
goto out_free_buffer;
}
- if (((addr / msb->page_size)
- == be32_to_cpu(param.data_address))
- && (((addr + rc - 1) / msb->page_size)
- == be32_to_cpu(param.data_address))) {
+ if (((addr / msb->page_size) == (attr_offset / msb->page_size))
+ && (((addr + s_attr->size - 1) / msb->page_size)
+ == (attr_offset / msb->page_size))) {
memcpy(s_attr->data, buffer + addr % msb->page_size,
- rc);
+ s_attr->size);
continue;
}
- if (page_count <= (rc / msb->page_size)) {
+ attr_offset = (addr / msb->page_size) * msb->page_size;
+
+ if ((attr_offset + attr_len) < (addr + s_attr->size)) {
kfree(buffer);
- page_count = (rc / msb->page_size) + 1;
- buffer = kmalloc(page_count * msb->page_size,
- GFP_KERNEL);
+ attr_len = (((addr + s_attr->size) / msb->page_size)
+ + 1 ) * msb->page_size - attr_offset;
+ buffer = kmalloc(attr_len, GFP_KERNEL);
if (!buffer) {
rc = -ENOMEM;
goto out_free_attr;
}
}
- param.system = msb->system;
- param.data_count = cpu_to_be16((rc / msb->page_size) + 1);
- param.data_address = cpu_to_be32(addr / msb->page_size);
- param.tpc_param = 0;
-
- sg_init_one(&msb->req_sg[0], buffer,
- be16_to_cpu(param.data_count) * msb->page_size);
+ sg_init_one(&msb->req_sg[0], buffer, attr_len);
msb->seg_count = 1;
msb->current_seg = 0;
msb->current_page = 0;
msb->data_dir = READ;
msb->transfer_cmd = MSPRO_CMD_READ_ATRB;
- dev_dbg(&card->dev, "reading attribute pages %x, %x\n",
- be32_to_cpu(param.data_address),
- be16_to_cpu(param.data_count));
+ dev_dbg(&card->dev, "reading attribute range %x, %x\n",
+ attr_offset, attr_len);
- card->next_request = h_mspro_block_req_init;
- msb->mrq_handler = h_mspro_block_transfer_data;
- memstick_init_req(&card->current_mrq, MS_TPC_WRITE_REG,
- (char *)¶m, sizeof(param));
+ msb->setup_transfer(card, attr_offset, attr_len);
memstick_new_req(card->host);
wait_for_completion(&card->mrq_complete);
if (card->current_mrq.error) {
@@ -1105,7 +1114,8 @@ static int mspro_block_read_attributes(struct memstick_dev *card)
goto out_free_buffer;
}
- memcpy(s_attr->data, buffer + addr % msb->page_size, rc);
+ memcpy(s_attr->data, buffer + addr % msb->page_size,
+ s_attr->size);
}
rc = 0;
@@ -1123,6 +1133,8 @@ static int mspro_block_init_card(struct memstick_dev *card)
int rc = 0;
msb->system = MEMSTICK_SYS_SERIAL;
+ msb->setup_transfer = h_mspro_block_setup_cmd;
+
card->reg_addr.r_offset = offsetof(struct mspro_register, status);
card->reg_addr.r_length = sizeof(struct ms_status_register);
card->reg_addr.w_offset = offsetof(struct mspro_register, param);
--
1.6.5.1
--
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