diff options
Diffstat (limited to 'target/linux/pistachio/patches-4.14/102-spi-img-spfi-Implement-dual-and-quad-mode.patch')
| -rw-r--r-- | target/linux/pistachio/patches-4.14/102-spi-img-spfi-Implement-dual-and-quad-mode.patch | 198 |
1 files changed, 198 insertions, 0 deletions
diff --git a/target/linux/pistachio/patches-4.14/102-spi-img-spfi-Implement-dual-and-quad-mode.patch b/target/linux/pistachio/patches-4.14/102-spi-img-spfi-Implement-dual-and-quad-mode.patch new file mode 100644 index 0000000000..15a5d3c806 --- /dev/null +++ b/target/linux/pistachio/patches-4.14/102-spi-img-spfi-Implement-dual-and-quad-mode.patch @@ -0,0 +1,198 @@ +From cd2a6af51553d38072cd31699b58d16ca6176ef5 Mon Sep 17 00:00:00 2001 +From: Ionela Voinescu <ionela.voinescu@imgtec.com> +Date: Thu, 2 Feb 2017 16:46:14 +0000 +Subject: spi: img-spfi: Implement dual and quad mode + +For dual and quad modes to work the SPFI controller needs +to have information about command/address/dummy bytes in the +transaction register. This information is not relevant for +single mode, and therefore it can have any value in the +allowed range. Therefore, for any read or write transfers of less +than 8 bytes (cmd = 1 byte, addr up to 7 bytes), SPFI will be +configured, but not enabled (unless it is the last transfer in +the queue). The transfer will be enabled by the subsequent tranfer. +A pending transfer is determined by the content of the transaction +register: if command part is set and tsize is not. + +This way we ensure that for dual and quad transactions +the command request size will apear in the command/address part +of the transaction register, while the data size will be in +tsize, all data being sent/received in the same transaction (as +set up in the transaction register). + +Signed-off-by: Ionela Voinescu <ionela.voinescu@imgtec.com> +Signed-off-by: Ezequiel Garcia <ezequiel.garcia@imgtec.com> +--- + drivers/spi/spi-img-spfi.c | 96 ++++++++++++++++++++++++++++++++++++++++------ + 1 file changed, 85 insertions(+), 11 deletions(-) + +--- a/drivers/spi/spi-img-spfi.c ++++ b/drivers/spi/spi-img-spfi.c +@@ -40,7 +40,8 @@ + #define SPFI_CONTROL_SOFT_RESET BIT(11) + #define SPFI_CONTROL_SEND_DMA BIT(10) + #define SPFI_CONTROL_GET_DMA BIT(9) +-#define SPFI_CONTROL_SE BIT(8) ++#define SPFI_CONTROL_SE BIT(8) ++#define SPFI_CONTROL_TX_RX BIT(1) + #define SPFI_CONTROL_TMODE_SHIFT 5 + #define SPFI_CONTROL_TMODE_MASK 0x7 + #define SPFI_CONTROL_TMODE_SINGLE 0 +@@ -51,6 +52,10 @@ + #define SPFI_TRANSACTION 0x18 + #define SPFI_TRANSACTION_TSIZE_SHIFT 16 + #define SPFI_TRANSACTION_TSIZE_MASK 0xffff ++#define SPFI_TRANSACTION_CMD_SHIFT 13 ++#define SPFI_TRANSACTION_CMD_MASK 0x7 ++#define SPFI_TRANSACTION_ADDR_SHIFT 10 ++#define SPFI_TRANSACTION_ADDR_MASK 0x7 + + #define SPFI_PORT_STATE 0x1c + #define SPFI_PORT_STATE_DEV_SEL_SHIFT 20 +@@ -87,6 +92,7 @@ + */ + #define SPFI_32BIT_FIFO_SIZE 64 + #define SPFI_8BIT_FIFO_SIZE 16 ++#define SPFI_DATA_REQUEST_MAX_SIZE 8 + + struct img_spfi { + struct device *dev; +@@ -103,6 +109,8 @@ struct img_spfi { + struct dma_chan *tx_ch; + bool tx_dma_busy; + bool rx_dma_busy; ++ ++ bool complete; + }; + + struct img_spfi_device_data { +@@ -123,9 +131,11 @@ static inline void spfi_start(struct img + { + u32 val; + +- val = spfi_readl(spfi, SPFI_CONTROL); +- val |= SPFI_CONTROL_SPFI_EN; +- spfi_writel(spfi, val, SPFI_CONTROL); ++ if (spfi->complete) { ++ val = spfi_readl(spfi, SPFI_CONTROL); ++ val |= SPFI_CONTROL_SPFI_EN; ++ spfi_writel(spfi, val, SPFI_CONTROL); ++ } + } + + static inline void spfi_reset(struct img_spfi *spfi) +@@ -138,12 +148,21 @@ static int spfi_wait_all_done(struct img + { + unsigned long timeout = jiffies + msecs_to_jiffies(50); + ++ if (!(spfi->complete)) ++ return 0; ++ + while (time_before(jiffies, timeout)) { + u32 status = spfi_readl(spfi, SPFI_INTERRUPT_STATUS); + + if (status & SPFI_INTERRUPT_ALLDONETRIG) { + spfi_writel(spfi, SPFI_INTERRUPT_ALLDONETRIG, + SPFI_INTERRUPT_CLEAR); ++ /* ++ * Disable SPFI for it not to interfere with ++ * pending transactions ++ */ ++ spfi_writel(spfi, spfi_readl(spfi, SPFI_CONTROL) ++ & ~SPFI_CONTROL_SPFI_EN, SPFI_CONTROL); + return 0; + } + cpu_relax(); +@@ -494,9 +513,32 @@ static void img_spfi_config(struct spi_m + struct spi_transfer *xfer) + { + struct img_spfi *spfi = spi_master_get_devdata(spi->master); +- u32 val, div; ++ u32 val, div, transact; ++ bool is_pending; + + /* ++ * For read or write transfers of less than 8 bytes (cmd = 1 byte, ++ * addr up to 7 bytes), SPFI will be configured, but not enabled ++ * (unless it is the last transfer in the queue).The transfer will ++ * be enabled by the subsequent transfer. ++ * A pending transfer is determined by the content of the ++ * transaction register: if command part is set and tsize ++ * is not ++ */ ++ transact = spfi_readl(spfi, SPFI_TRANSACTION); ++ is_pending = ((transact >> SPFI_TRANSACTION_CMD_SHIFT) & ++ SPFI_TRANSACTION_CMD_MASK) && ++ (!((transact >> SPFI_TRANSACTION_TSIZE_SHIFT) & ++ SPFI_TRANSACTION_TSIZE_MASK)); ++ ++ /* If there are no pending transactions it's OK to soft reset */ ++ if (!is_pending) { ++ /* Start the transaction from a known (reset) state */ ++ spfi_reset(spfi); ++ } ++ ++ /* ++ * Before anything else, set up parameters. + * output = spfi_clk * (BITCLK / 512), where BITCLK must be a + * power of 2 up to 128 + */ +@@ -509,20 +551,52 @@ static void img_spfi_config(struct spi_m + val |= div << SPFI_DEVICE_PARAMETER_BITCLK_SHIFT; + spfi_writel(spfi, val, SPFI_DEVICE_PARAMETER(spi->chip_select)); + +- spfi_writel(spfi, xfer->len << SPFI_TRANSACTION_TSIZE_SHIFT, +- SPFI_TRANSACTION); ++ if (!list_is_last(&xfer->transfer_list, &master->cur_msg->transfers) && ++ /* ++ * For duplex mode (both the tx and rx buffers are !NULL) the ++ * CMD, ADDR, and DUMMY byte parts of the transaction register ++ * should always be 0 and therefore the pending transfer ++ * technique cannot be used. ++ */ ++ (xfer->tx_buf) && (!xfer->rx_buf) && ++ (xfer->len <= SPFI_DATA_REQUEST_MAX_SIZE) && !is_pending) { ++ transact = (1 & SPFI_TRANSACTION_CMD_MASK) << ++ SPFI_TRANSACTION_CMD_SHIFT; ++ transact |= ((xfer->len - 1) & SPFI_TRANSACTION_ADDR_MASK) << ++ SPFI_TRANSACTION_ADDR_SHIFT; ++ spfi->complete = false; ++ } else { ++ spfi->complete = true; ++ if (is_pending) { ++ /* Keep setup from pending transfer */ ++ transact |= ((xfer->len & SPFI_TRANSACTION_TSIZE_MASK) << ++ SPFI_TRANSACTION_TSIZE_SHIFT); ++ } else { ++ transact = ((xfer->len & SPFI_TRANSACTION_TSIZE_MASK) << ++ SPFI_TRANSACTION_TSIZE_SHIFT); ++ } ++ } ++ spfi_writel(spfi, transact, SPFI_TRANSACTION); + + val = spfi_readl(spfi, SPFI_CONTROL); + val &= ~(SPFI_CONTROL_SEND_DMA | SPFI_CONTROL_GET_DMA); +- if (xfer->tx_buf) ++ /* ++ * We set up send DMA for pending transfers also, as ++ * those are always send transfers ++ */ ++ if ((xfer->tx_buf) || is_pending) + val |= SPFI_CONTROL_SEND_DMA; +- if (xfer->rx_buf) ++ if (xfer->tx_buf) ++ val |= SPFI_CONTROL_TX_RX; ++ if (xfer->rx_buf) { + val |= SPFI_CONTROL_GET_DMA; ++ val &= ~SPFI_CONTROL_TX_RX; ++ } + val &= ~(SPFI_CONTROL_TMODE_MASK << SPFI_CONTROL_TMODE_SHIFT); +- if (xfer->tx_nbits == SPI_NBITS_DUAL && ++ if (xfer->tx_nbits == SPI_NBITS_DUAL || + xfer->rx_nbits == SPI_NBITS_DUAL) + val |= SPFI_CONTROL_TMODE_DUAL << SPFI_CONTROL_TMODE_SHIFT; +- else if (xfer->tx_nbits == SPI_NBITS_QUAD && ++ else if (xfer->tx_nbits == SPI_NBITS_QUAD || + xfer->rx_nbits == SPI_NBITS_QUAD) + val |= SPFI_CONTROL_TMODE_QUAD << SPFI_CONTROL_TMODE_SHIFT; + val |= SPFI_CONTROL_SE; |