Home Home > GIT Browse
summaryrefslogtreecommitdiff
diff options
context:
space:
mode:
authorAbhishek Sahu <absahu@codeaurora.org>2017-09-25 13:21:26 +0530
committerBoris Brezillon <boris.brezillon@free-electrons.com>2017-10-07 11:28:05 +0200
commit8d6b6d7e135e9bbfc923d34a45cb0e72695e63ed (patch)
tree7c3a94a47bd8928d03d6ceb36b52724d1ca7f0c7
parent8c4cdce8b1ab044a2ee1d86d5a086f67e32b3c10 (diff)
mtd: nand: qcom: support for command descriptor formation
1. Add the function for command descriptor preparation which will be used only by BAM DMA and it will form the DMA descriptors containing command elements 2. DMA_PREP_CMD flag should be used for forming command DMA descriptors Reviewed-by: Archit Taneja <architt@codeaurora.org> Signed-off-by: Abhishek Sahu <absahu@codeaurora.org> Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
-rw-r--r--drivers/mtd/nand/qcom_nandc.c108
1 files changed, 92 insertions, 16 deletions
diff --git a/drivers/mtd/nand/qcom_nandc.c b/drivers/mtd/nand/qcom_nandc.c
index 3d1d506d3d18..2656c1ac5646 100644
--- a/drivers/mtd/nand/qcom_nandc.c
+++ b/drivers/mtd/nand/qcom_nandc.c
@@ -200,6 +200,14 @@ nandc_set_reg(nandc, NAND_READ_LOCATION_##reg, \
*/
#define dev_cmd_reg_addr(nandc, reg) ((nandc)->props->dev_cmd_reg_start + (reg))
+/* Returns the NAND register physical address */
+#define nandc_reg_phys(chip, offset) ((chip)->base_phys + (offset))
+
+/* Returns the dma address for reg read buffer */
+#define reg_buf_dma_addr(chip, vaddr) \
+ ((chip)->reg_read_dma + \
+ ((uint8_t *)(vaddr) - (uint8_t *)(chip)->reg_read_buf))
+
#define QPIC_PER_CW_CMD_ELEMENTS 32
#define QPIC_PER_CW_CMD_SGL 32
#define QPIC_PER_CW_DATA_SGL 8
@@ -317,7 +325,8 @@ struct nandc_regs {
* controller
* @dev: parent device
* @base: MMIO base
- * @base_dma: physical base address of controller registers
+ * @base_phys: physical base address of controller registers
+ * @base_dma: dma base address of controller registers
* @core_clk: controller clock
* @aon_clk: another controller clock
*
@@ -350,6 +359,7 @@ struct qcom_nand_controller {
struct device *dev;
void __iomem *base;
+ phys_addr_t base_phys;
dma_addr_t base_dma;
struct clk *core_clk;
@@ -751,6 +761,66 @@ static int prepare_bam_async_desc(struct qcom_nand_controller *nandc,
}
/*
+ * Prepares the command descriptor for BAM DMA which will be used for NAND
+ * register reads and writes. The command descriptor requires the command
+ * to be formed in command element type so this function uses the command
+ * element from bam transaction ce array and fills the same with required
+ * data. A single SGL can contain multiple command elements so
+ * NAND_BAM_NEXT_SGL will be used for starting the separate SGL
+ * after the current command element.
+ */
+static int prep_bam_dma_desc_cmd(struct qcom_nand_controller *nandc, bool read,
+ int reg_off, const void *vaddr,
+ int size, unsigned int flags)
+{
+ int bam_ce_size;
+ int i, ret;
+ struct bam_cmd_element *bam_ce_buffer;
+ struct bam_transaction *bam_txn = nandc->bam_txn;
+
+ bam_ce_buffer = &bam_txn->bam_ce[bam_txn->bam_ce_pos];
+
+ /* fill the command desc */
+ for (i = 0; i < size; i++) {
+ if (read)
+ bam_prep_ce(&bam_ce_buffer[i],
+ nandc_reg_phys(nandc, reg_off + 4 * i),
+ BAM_READ_COMMAND,
+ reg_buf_dma_addr(nandc,
+ (__le32 *)vaddr + i));
+ else
+ bam_prep_ce_le32(&bam_ce_buffer[i],
+ nandc_reg_phys(nandc, reg_off + 4 * i),
+ BAM_WRITE_COMMAND,
+ *((__le32 *)vaddr + i));
+ }
+
+ bam_txn->bam_ce_pos += size;
+
+ /* use the separate sgl after this command */
+ if (flags & NAND_BAM_NEXT_SGL) {
+ bam_ce_buffer = &bam_txn->bam_ce[bam_txn->bam_ce_start];
+ bam_ce_size = (bam_txn->bam_ce_pos -
+ bam_txn->bam_ce_start) *
+ sizeof(struct bam_cmd_element);
+ sg_set_buf(&bam_txn->cmd_sgl[bam_txn->cmd_sgl_pos],
+ bam_ce_buffer, bam_ce_size);
+ bam_txn->cmd_sgl_pos++;
+ bam_txn->bam_ce_start = bam_txn->bam_ce_pos;
+
+ if (flags & NAND_BAM_NWD) {
+ ret = prepare_bam_async_desc(nandc, nandc->cmd_chan,
+ DMA_PREP_FENCE |
+ DMA_PREP_CMD);
+ if (ret)
+ return ret;
+ }
+ }
+
+ return 0;
+}
+
+/*
* Prepares the data descriptor for BAM DMA which will be used for NAND
* data reads and writes.
*/
@@ -868,19 +938,22 @@ static int read_reg_dma(struct qcom_nand_controller *nandc, int first,
{
bool flow_control = false;
void *vaddr;
- int size;
- if (first == NAND_READ_ID || first == NAND_FLASH_STATUS)
- flow_control = true;
+ vaddr = nandc->reg_read_buf + nandc->reg_read_pos;
+ nandc->reg_read_pos += num_regs;
if (first == NAND_DEV_CMD_VLD || first == NAND_DEV_CMD1)
first = dev_cmd_reg_addr(nandc, first);
- size = num_regs * sizeof(u32);
- vaddr = nandc->reg_read_buf + nandc->reg_read_pos;
- nandc->reg_read_pos += num_regs;
+ if (nandc->props->is_bam)
+ return prep_bam_dma_desc_cmd(nandc, true, first, vaddr,
+ num_regs, flags);
- return prep_adm_dma_desc(nandc, true, first, vaddr, size, flow_control);
+ if (first == NAND_READ_ID || first == NAND_FLASH_STATUS)
+ flow_control = true;
+
+ return prep_adm_dma_desc(nandc, true, first, vaddr,
+ num_regs * sizeof(u32), flow_control);
}
/*
@@ -897,13 +970,9 @@ static int write_reg_dma(struct qcom_nand_controller *nandc, int first,
bool flow_control = false;
struct nandc_regs *regs = nandc->regs;
void *vaddr;
- int size;
vaddr = offset_to_nandc_reg(regs, first);
- if (first == NAND_FLASH_CMD)
- flow_control = true;
-
if (first == NAND_ERASED_CW_DETECT_CFG) {
if (flags & NAND_ERASED_CW_SET)
vaddr = &regs->erased_cw_detect_cfg_set;
@@ -920,10 +989,15 @@ static int write_reg_dma(struct qcom_nand_controller *nandc, int first,
if (first == NAND_DEV_CMD_VLD_RESTORE || first == NAND_DEV_CMD_VLD)
first = dev_cmd_reg_addr(nandc, NAND_DEV_CMD_VLD);
- size = num_regs * sizeof(u32);
+ if (nandc->props->is_bam)
+ return prep_bam_dma_desc_cmd(nandc, false, first, vaddr,
+ num_regs, flags);
+
+ if (first == NAND_FLASH_CMD)
+ flow_control = true;
- return prep_adm_dma_desc(nandc, false, first, vaddr, size,
- flow_control);
+ return prep_adm_dma_desc(nandc, false, first, vaddr,
+ num_regs * sizeof(u32), flow_control);
}
/*
@@ -1187,7 +1261,8 @@ static int submit_descs(struct qcom_nand_controller *nandc)
}
if (bam_txn->cmd_sgl_pos > bam_txn->cmd_sgl_start) {
- r = prepare_bam_async_desc(nandc, nandc->cmd_chan, 0);
+ r = prepare_bam_async_desc(nandc, nandc->cmd_chan,
+ DMA_PREP_CMD);
if (r)
return r;
}
@@ -2722,6 +2797,7 @@ static int qcom_nandc_probe(struct platform_device *pdev)
if (IS_ERR(nandc->base))
return PTR_ERR(nandc->base);
+ nandc->base_phys = res->start;
nandc->base_dma = phys_to_dma(dev, (phys_addr_t)res->start);
nandc->core_clk = devm_clk_get(dev, "core");