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-rw-r--r--drivers/spi/amba-pl022.c250
1 files changed, 187 insertions, 63 deletions
diff --git a/drivers/spi/amba-pl022.c b/drivers/spi/amba-pl022.c
index e9aeee16d922..f0a1418ce660 100644
--- a/drivers/spi/amba-pl022.c
+++ b/drivers/spi/amba-pl022.c
@@ -102,13 +102,21 @@
/*
* SSP Control Register 0 - SSP_CR0
*/
-#define SSP_CR0_MASK_DSS (0x1FUL << 0)
-#define SSP_CR0_MASK_HALFDUP (0x1UL << 5)
+#define SSP_CR0_MASK_DSS (0x0FUL << 0)
+#define SSP_CR0_MASK_FRF (0x3UL << 4)
#define SSP_CR0_MASK_SPO (0x1UL << 6)
#define SSP_CR0_MASK_SPH (0x1UL << 7)
#define SSP_CR0_MASK_SCR (0xFFUL << 8)
-#define SSP_CR0_MASK_CSS (0x1FUL << 16)
-#define SSP_CR0_MASK_FRF (0x3UL << 21)
+
+/*
+ * The ST version of this block moves som bits
+ * in SSP_CR0 and extends it to 32 bits
+ */
+#define SSP_CR0_MASK_DSS_ST (0x1FUL << 0)
+#define SSP_CR0_MASK_HALFDUP_ST (0x1UL << 5)
+#define SSP_CR0_MASK_CSS_ST (0x1FUL << 16)
+#define SSP_CR0_MASK_FRF_ST (0x3UL << 21)
+
/*
* SSP Control Register 0 - SSP_CR1
@@ -117,16 +125,18 @@
#define SSP_CR1_MASK_SSE (0x1UL << 1)
#define SSP_CR1_MASK_MS (0x1UL << 2)
#define SSP_CR1_MASK_SOD (0x1UL << 3)
-#define SSP_CR1_MASK_RENDN (0x1UL << 4)
-#define SSP_CR1_MASK_TENDN (0x1UL << 5)
-#define SSP_CR1_MASK_MWAIT (0x1UL << 6)
-#define SSP_CR1_MASK_RXIFLSEL (0x7UL << 7)
-#define SSP_CR1_MASK_TXIFLSEL (0x7UL << 10)
/*
- * SSP Data Register - SSP_DR
+ * The ST version of this block adds some bits
+ * in SSP_CR1
*/
-#define SSP_DR_MASK_DATA 0xFFFFFFFF
+#define SSP_CR1_MASK_RENDN_ST (0x1UL << 4)
+#define SSP_CR1_MASK_TENDN_ST (0x1UL << 5)
+#define SSP_CR1_MASK_MWAIT_ST (0x1UL << 6)
+#define SSP_CR1_MASK_RXIFLSEL_ST (0x7UL << 7)
+#define SSP_CR1_MASK_TXIFLSEL_ST (0x7UL << 10)
+/* This one is only in the PL023 variant */
+#define SSP_CR1_MASK_FBCLKDEL_ST (0x7UL << 13)
/*
* SSP Status Register - SSP_SR
@@ -134,7 +144,7 @@
#define SSP_SR_MASK_TFE (0x1UL << 0) /* Transmit FIFO empty */
#define SSP_SR_MASK_TNF (0x1UL << 1) /* Transmit FIFO not full */
#define SSP_SR_MASK_RNE (0x1UL << 2) /* Receive FIFO not empty */
-#define SSP_SR_MASK_RFF (0x1UL << 3) /* Receive FIFO full */
+#define SSP_SR_MASK_RFF (0x1UL << 3) /* Receive FIFO full */
#define SSP_SR_MASK_BSY (0x1UL << 4) /* Busy Flag */
/*
@@ -227,7 +237,7 @@
/*
* SSP Test Data Register - SSP_TDR
*/
-#define TDR_MASK_TESTDATA (0xFFFFFFFF)
+#define TDR_MASK_TESTDATA (0xFFFFFFFF)
/*
* Message State
@@ -235,33 +245,33 @@
* hold a single state value, that's why all this
* (void *) casting is done here.
*/
-#define STATE_START ((void *) 0)
-#define STATE_RUNNING ((void *) 1)
-#define STATE_DONE ((void *) 2)
-#define STATE_ERROR ((void *) -1)
+#define STATE_START ((void *) 0)
+#define STATE_RUNNING ((void *) 1)
+#define STATE_DONE ((void *) 2)
+#define STATE_ERROR ((void *) -1)
/*
* Queue State
*/
-#define QUEUE_RUNNING (0)
-#define QUEUE_STOPPED (1)
+#define QUEUE_RUNNING (0)
+#define QUEUE_STOPPED (1)
/*
* SSP State - Whether Enabled or Disabled
*/
-#define SSP_DISABLED (0)
-#define SSP_ENABLED (1)
+#define SSP_DISABLED (0)
+#define SSP_ENABLED (1)
/*
* SSP DMA State - Whether DMA Enabled or Disabled
*/
-#define SSP_DMA_DISABLED (0)
-#define SSP_DMA_ENABLED (1)
+#define SSP_DMA_DISABLED (0)
+#define SSP_DMA_ENABLED (1)
/*
* SSP Clock Defaults
*/
-#define NMDK_SSP_DEFAULT_CLKRATE 0x2
-#define NMDK_SSP_DEFAULT_PRESCALE 0x40
+#define SSP_DEFAULT_CLKRATE 0x2
+#define SSP_DEFAULT_PRESCALE 0x40
/*
* SSP Clock Parameter ranges
@@ -307,16 +317,22 @@ enum ssp_writing {
* @fifodepth: depth of FIFOs (both)
* @max_bpw: maximum number of bits per word
* @unidir: supports unidirection transfers
+ * @extended_cr: 32 bit wide control register 0 with extra
+ * features and extra features in CR1 as found in the ST variants
+ * @pl023: supports a subset of the ST extensions called "PL023"
*/
struct vendor_data {
int fifodepth;
int max_bpw;
bool unidir;
+ bool extended_cr;
+ bool pl023;
};
/**
* struct pl022 - This is the private SSP driver data structure
* @adev: AMBA device model hookup
+ * @vendor: Vendor data for the IP block
* @phybase: The physical memory where the SSP device resides
* @virtbase: The virtual memory where the SSP is mapped
* @master: SPI framework hookup
@@ -369,7 +385,8 @@ struct pl022 {
/**
* struct chip_data - To maintain runtime state of SSP for each client chip
- * @cr0: Value of control register CR0 of SSP
+ * @cr0: Value of control register CR0 of SSP - on later ST variants this
+ * register is 32 bits wide rather than just 16
* @cr1: Value of control register CR1 of SSP
* @dmacr: Value of DMA control Register of SSP
* @cpsr: Value of Clock prescale register
@@ -384,7 +401,7 @@ struct pl022 {
* This would be set according to the current message that would be served
*/
struct chip_data {
- u16 cr0;
+ u32 cr0;
u16 cr1;
u16 dmacr;
u16 cpsr;
@@ -517,7 +534,10 @@ static void restore_state(struct pl022 *pl022)
{
struct chip_data *chip = pl022->cur_chip;
- writew(chip->cr0, SSP_CR0(pl022->virtbase));
+ if (pl022->vendor->extended_cr)
+ writel(chip->cr0, SSP_CR0(pl022->virtbase));
+ else
+ writew(chip->cr0, SSP_CR0(pl022->virtbase));
writew(chip->cr1, SSP_CR1(pl022->virtbase));
writew(chip->dmacr, SSP_DMACR(pl022->virtbase));
writew(chip->cpsr, SSP_CPSR(pl022->virtbase));
@@ -525,38 +545,70 @@ static void restore_state(struct pl022 *pl022)
writew(CLEAR_ALL_INTERRUPTS, SSP_ICR(pl022->virtbase));
}
-/**
- * load_ssp_default_config - Load default configuration for SSP
- * @pl022: SSP driver private data structure
- */
-
/*
* Default SSP Register Values
*/
#define DEFAULT_SSP_REG_CR0 ( \
GEN_MASK_BITS(SSP_DATA_BITS_12, SSP_CR0_MASK_DSS, 0) | \
- GEN_MASK_BITS(SSP_MICROWIRE_CHANNEL_FULL_DUPLEX, SSP_CR0_MASK_HALFDUP, 5) | \
+ GEN_MASK_BITS(SSP_INTERFACE_MOTOROLA_SPI, SSP_CR0_MASK_FRF, 4) | \
GEN_MASK_BITS(SSP_CLK_POL_IDLE_LOW, SSP_CR0_MASK_SPO, 6) | \
GEN_MASK_BITS(SSP_CLK_SECOND_EDGE, SSP_CR0_MASK_SPH, 7) | \
- GEN_MASK_BITS(NMDK_SSP_DEFAULT_CLKRATE, SSP_CR0_MASK_SCR, 8) | \
- GEN_MASK_BITS(SSP_BITS_8, SSP_CR0_MASK_CSS, 16) | \
- GEN_MASK_BITS(SSP_INTERFACE_MOTOROLA_SPI, SSP_CR0_MASK_FRF, 21) \
+ GEN_MASK_BITS(SSP_DEFAULT_CLKRATE, SSP_CR0_MASK_SCR, 8) \
+)
+
+/* ST versions have slightly different bit layout */
+#define DEFAULT_SSP_REG_CR0_ST ( \
+ GEN_MASK_BITS(SSP_DATA_BITS_12, SSP_CR0_MASK_DSS_ST, 0) | \
+ GEN_MASK_BITS(SSP_MICROWIRE_CHANNEL_FULL_DUPLEX, SSP_CR0_MASK_HALFDUP_ST, 5) | \
+ GEN_MASK_BITS(SSP_CLK_POL_IDLE_LOW, SSP_CR0_MASK_SPO, 6) | \
+ GEN_MASK_BITS(SSP_CLK_SECOND_EDGE, SSP_CR0_MASK_SPH, 7) | \
+ GEN_MASK_BITS(SSP_DEFAULT_CLKRATE, SSP_CR0_MASK_SCR, 8) | \
+ GEN_MASK_BITS(SSP_BITS_8, SSP_CR0_MASK_CSS_ST, 16) | \
+ GEN_MASK_BITS(SSP_INTERFACE_MOTOROLA_SPI, SSP_CR0_MASK_FRF_ST, 21) \
+)
+
+/* The PL023 version is slightly different again */
+#define DEFAULT_SSP_REG_CR0_ST_PL023 ( \
+ GEN_MASK_BITS(SSP_DATA_BITS_12, SSP_CR0_MASK_DSS_ST, 0) | \
+ GEN_MASK_BITS(SSP_CLK_POL_IDLE_LOW, SSP_CR0_MASK_SPO, 6) | \
+ GEN_MASK_BITS(SSP_CLK_SECOND_EDGE, SSP_CR0_MASK_SPH, 7) | \
+ GEN_MASK_BITS(SSP_DEFAULT_CLKRATE, SSP_CR0_MASK_SCR, 8) \
)
#define DEFAULT_SSP_REG_CR1 ( \
GEN_MASK_BITS(LOOPBACK_DISABLED, SSP_CR1_MASK_LBM, 0) | \
GEN_MASK_BITS(SSP_DISABLED, SSP_CR1_MASK_SSE, 1) | \
GEN_MASK_BITS(SSP_MASTER, SSP_CR1_MASK_MS, 2) | \
+ GEN_MASK_BITS(DO_NOT_DRIVE_TX, SSP_CR1_MASK_SOD, 3) \
+)
+
+/* ST versions extend this register to use all 16 bits */
+#define DEFAULT_SSP_REG_CR1_ST ( \
+ DEFAULT_SSP_REG_CR1 | \
+ GEN_MASK_BITS(SSP_RX_MSB, SSP_CR1_MASK_RENDN_ST, 4) | \
+ GEN_MASK_BITS(SSP_TX_MSB, SSP_CR1_MASK_TENDN_ST, 5) | \
+ GEN_MASK_BITS(SSP_MWIRE_WAIT_ZERO, SSP_CR1_MASK_MWAIT_ST, 6) |\
+ GEN_MASK_BITS(SSP_RX_1_OR_MORE_ELEM, SSP_CR1_MASK_RXIFLSEL_ST, 7) | \
+ GEN_MASK_BITS(SSP_TX_1_OR_MORE_EMPTY_LOC, SSP_CR1_MASK_TXIFLSEL_ST, 10) \
+)
+
+/*
+ * The PL023 variant has further differences: no loopback mode, no microwire
+ * support, and a new clock feedback delay setting.
+ */
+#define DEFAULT_SSP_REG_CR1_ST_PL023 ( \
+ GEN_MASK_BITS(SSP_DISABLED, SSP_CR1_MASK_SSE, 1) | \
+ GEN_MASK_BITS(SSP_MASTER, SSP_CR1_MASK_MS, 2) | \
GEN_MASK_BITS(DO_NOT_DRIVE_TX, SSP_CR1_MASK_SOD, 3) | \
- GEN_MASK_BITS(SSP_RX_MSB, SSP_CR1_MASK_RENDN, 4) | \
- GEN_MASK_BITS(SSP_TX_MSB, SSP_CR1_MASK_TENDN, 5) | \
- GEN_MASK_BITS(SSP_MWIRE_WAIT_ZERO, SSP_CR1_MASK_MWAIT, 6) |\
- GEN_MASK_BITS(SSP_RX_1_OR_MORE_ELEM, SSP_CR1_MASK_RXIFLSEL, 7) | \
- GEN_MASK_BITS(SSP_TX_1_OR_MORE_EMPTY_LOC, SSP_CR1_MASK_TXIFLSEL, 10) \
+ GEN_MASK_BITS(SSP_RX_MSB, SSP_CR1_MASK_RENDN_ST, 4) | \
+ GEN_MASK_BITS(SSP_TX_MSB, SSP_CR1_MASK_TENDN_ST, 5) | \
+ GEN_MASK_BITS(SSP_RX_1_OR_MORE_ELEM, SSP_CR1_MASK_RXIFLSEL_ST, 7) | \
+ GEN_MASK_BITS(SSP_TX_1_OR_MORE_EMPTY_LOC, SSP_CR1_MASK_TXIFLSEL_ST, 10) | \
+ GEN_MASK_BITS(SSP_FEEDBACK_CLK_DELAY_NONE, SSP_CR1_MASK_FBCLKDEL_ST, 13) \
)
#define DEFAULT_SSP_REG_CPSR ( \
- GEN_MASK_BITS(NMDK_SSP_DEFAULT_PRESCALE, SSP_CPSR_MASK_CPSDVSR, 0) \
+ GEN_MASK_BITS(SSP_DEFAULT_PRESCALE, SSP_CPSR_MASK_CPSDVSR, 0) \
)
#define DEFAULT_SSP_REG_DMACR (\
@@ -564,11 +616,22 @@ static void restore_state(struct pl022 *pl022)
GEN_MASK_BITS(SSP_DMA_DISABLED, SSP_DMACR_MASK_TXDMAE, 1) \
)
-
+/**
+ * load_ssp_default_config - Load default configuration for SSP
+ * @pl022: SSP driver private data structure
+ */
static void load_ssp_default_config(struct pl022 *pl022)
{
- writew(DEFAULT_SSP_REG_CR0, SSP_CR0(pl022->virtbase));
- writew(DEFAULT_SSP_REG_CR1, SSP_CR1(pl022->virtbase));
+ if (pl022->vendor->pl023) {
+ writel(DEFAULT_SSP_REG_CR0_ST_PL023, SSP_CR0(pl022->virtbase));
+ writew(DEFAULT_SSP_REG_CR1_ST_PL023, SSP_CR1(pl022->virtbase));
+ } else if (pl022->vendor->extended_cr) {
+ writel(DEFAULT_SSP_REG_CR0_ST, SSP_CR0(pl022->virtbase));
+ writew(DEFAULT_SSP_REG_CR1_ST, SSP_CR1(pl022->virtbase));
+ } else {
+ writew(DEFAULT_SSP_REG_CR0, SSP_CR0(pl022->virtbase));
+ writew(DEFAULT_SSP_REG_CR1, SSP_CR1(pl022->virtbase));
+ }
writew(DEFAULT_SSP_REG_DMACR, SSP_DMACR(pl022->virtbase));
writew(DEFAULT_SSP_REG_CPSR, SSP_CPSR(pl022->virtbase));
writew(DISABLE_ALL_INTERRUPTS, SSP_IMSC(pl022->virtbase));
@@ -1008,7 +1071,7 @@ static void do_polling_transfer(void *data)
writew((readw(SSP_CR1(pl022->virtbase)) | SSP_CR1_MASK_SSE),
SSP_CR1(pl022->virtbase));
- dev_dbg(&pl022->adev->dev, "POLLING TRANSFER ONGOING ... \n");
+ dev_dbg(&pl022->adev->dev, "polling transfer ongoing ...\n");
/* FIXME: insert a timeout so we don't hang here indefinately */
while (pl022->tx < pl022->tx_end || pl022->rx < pl022->rx_end)
readwriter(pl022);
@@ -1148,7 +1211,6 @@ static int stop_queue(struct pl022 *pl022)
* A wait_queue on the pl022->busy could be used, but then the common
* execution path (pump_messages) would be required to call wake_up or
* friends on every SPI message. Do this instead */
- pl022->run = QUEUE_STOPPED;
while (!list_empty(&pl022->queue) && pl022->busy && limit--) {
spin_unlock_irqrestore(&pl022->queue_lock, flags);
msleep(10);
@@ -1157,6 +1219,7 @@ static int stop_queue(struct pl022 *pl022)
if (!list_empty(&pl022->queue) || pl022->busy)
status = -EBUSY;
+ else pl022->run = QUEUE_STOPPED;
spin_unlock_irqrestore(&pl022->queue_lock, flags);
@@ -1280,11 +1343,21 @@ static int verify_controller_parameters(struct pl022 *pl022,
"Wait State is configured incorrectly\n");
return -EINVAL;
}
- if ((chip_info->duplex != SSP_MICROWIRE_CHANNEL_FULL_DUPLEX)
- && (chip_info->duplex !=
- SSP_MICROWIRE_CHANNEL_HALF_DUPLEX)) {
- dev_err(chip_info->dev,
- "DUPLEX is configured incorrectly\n");
+ /* Half duplex is only available in the ST Micro version */
+ if (pl022->vendor->extended_cr) {
+ if ((chip_info->duplex !=
+ SSP_MICROWIRE_CHANNEL_FULL_DUPLEX)
+ && (chip_info->duplex !=
+ SSP_MICROWIRE_CHANNEL_HALF_DUPLEX))
+ dev_err(chip_info->dev,
+ "Microwire duplex mode is configured incorrectly\n");
+ return -EINVAL;
+ } else {
+ if (chip_info->duplex != SSP_MICROWIRE_CHANNEL_FULL_DUPLEX)
+ dev_err(chip_info->dev,
+ "Microwire half duplex mode requested,"
+ " but this is only available in the"
+ " ST version of PL022\n");
return -EINVAL;
}
}
@@ -1581,22 +1654,49 @@ static int pl022_setup(struct spi_device *spi)
chip->cpsr = chip_info->clk_freq.cpsdvsr;
- SSP_WRITE_BITS(chip->cr0, chip_info->data_size, SSP_CR0_MASK_DSS, 0);
- SSP_WRITE_BITS(chip->cr0, chip_info->duplex, SSP_CR0_MASK_HALFDUP, 5);
+ /* Special setup for the ST micro extended control registers */
+ if (pl022->vendor->extended_cr) {
+ if (pl022->vendor->pl023) {
+ /* These bits are only in the PL023 */
+ SSP_WRITE_BITS(chip->cr1, chip_info->clkdelay,
+ SSP_CR1_MASK_FBCLKDEL_ST, 13);
+ } else {
+ /* These bits are in the PL022 but not PL023 */
+ SSP_WRITE_BITS(chip->cr0, chip_info->duplex,
+ SSP_CR0_MASK_HALFDUP_ST, 5);
+ SSP_WRITE_BITS(chip->cr0, chip_info->ctrl_len,
+ SSP_CR0_MASK_CSS_ST, 16);
+ SSP_WRITE_BITS(chip->cr0, chip_info->iface,
+ SSP_CR0_MASK_FRF_ST, 21);
+ SSP_WRITE_BITS(chip->cr1, chip_info->wait_state,
+ SSP_CR1_MASK_MWAIT_ST, 6);
+ }
+ SSP_WRITE_BITS(chip->cr0, chip_info->data_size,
+ SSP_CR0_MASK_DSS_ST, 0);
+ SSP_WRITE_BITS(chip->cr1, chip_info->endian_rx,
+ SSP_CR1_MASK_RENDN_ST, 4);
+ SSP_WRITE_BITS(chip->cr1, chip_info->endian_tx,
+ SSP_CR1_MASK_TENDN_ST, 5);
+ SSP_WRITE_BITS(chip->cr1, chip_info->rx_lev_trig,
+ SSP_CR1_MASK_RXIFLSEL_ST, 7);
+ SSP_WRITE_BITS(chip->cr1, chip_info->tx_lev_trig,
+ SSP_CR1_MASK_TXIFLSEL_ST, 10);
+ } else {
+ SSP_WRITE_BITS(chip->cr0, chip_info->data_size,
+ SSP_CR0_MASK_DSS, 0);
+ SSP_WRITE_BITS(chip->cr0, chip_info->iface,
+ SSP_CR0_MASK_FRF, 4);
+ }
+ /* Stuff that is common for all versions */
SSP_WRITE_BITS(chip->cr0, chip_info->clk_pol, SSP_CR0_MASK_SPO, 6);
SSP_WRITE_BITS(chip->cr0, chip_info->clk_phase, SSP_CR0_MASK_SPH, 7);
SSP_WRITE_BITS(chip->cr0, chip_info->clk_freq.scr, SSP_CR0_MASK_SCR, 8);
- SSP_WRITE_BITS(chip->cr0, chip_info->ctrl_len, SSP_CR0_MASK_CSS, 16);
- SSP_WRITE_BITS(chip->cr0, chip_info->iface, SSP_CR0_MASK_FRF, 21);
- SSP_WRITE_BITS(chip->cr1, chip_info->lbm, SSP_CR1_MASK_LBM, 0);
+ /* Loopback is available on all versions except PL023 */
+ if (!pl022->vendor->pl023)
+ SSP_WRITE_BITS(chip->cr1, chip_info->lbm, SSP_CR1_MASK_LBM, 0);
SSP_WRITE_BITS(chip->cr1, SSP_DISABLED, SSP_CR1_MASK_SSE, 1);
SSP_WRITE_BITS(chip->cr1, chip_info->hierarchy, SSP_CR1_MASK_MS, 2);
SSP_WRITE_BITS(chip->cr1, chip_info->slave_tx_disable, SSP_CR1_MASK_SOD, 3);
- SSP_WRITE_BITS(chip->cr1, chip_info->endian_rx, SSP_CR1_MASK_RENDN, 4);
- SSP_WRITE_BITS(chip->cr1, chip_info->endian_tx, SSP_CR1_MASK_TENDN, 5);
- SSP_WRITE_BITS(chip->cr1, chip_info->wait_state, SSP_CR1_MASK_MWAIT, 6);
- SSP_WRITE_BITS(chip->cr1, chip_info->rx_lev_trig, SSP_CR1_MASK_RXIFLSEL, 7);
- SSP_WRITE_BITS(chip->cr1, chip_info->tx_lev_trig, SSP_CR1_MASK_TXIFLSEL, 10);
/* Save controller_state */
spi_set_ctldata(spi, chip);
@@ -1809,6 +1909,8 @@ static struct vendor_data vendor_arm = {
.fifodepth = 8,
.max_bpw = 16,
.unidir = false,
+ .extended_cr = false,
+ .pl023 = false,
};
@@ -1816,6 +1918,16 @@ static struct vendor_data vendor_st = {
.fifodepth = 32,
.max_bpw = 32,
.unidir = false,
+ .extended_cr = true,
+ .pl023 = false,
+};
+
+static struct vendor_data vendor_st_pl023 = {
+ .fifodepth = 32,
+ .max_bpw = 32,
+ .unidir = false,
+ .extended_cr = true,
+ .pl023 = true,
};
static struct amba_id pl022_ids[] = {
@@ -1837,6 +1949,18 @@ static struct amba_id pl022_ids[] = {
.mask = 0xffffffff,
.data = &vendor_st,
},
+ {
+ /*
+ * ST-Ericsson derivative "PL023" (this is not
+ * an official ARM number), this is a PL022 SSP block
+ * stripped to SPI mode only, it has 32bit wide
+ * and 32 locations deep TX/RX FIFO but no extended
+ * CR0/CR1 register
+ */
+ .id = 0x00080023,
+ .mask = 0xffffffff,
+ .data = &vendor_st_pl023,
+ },
{ 0, 0 },
};
generated by cgit v1.2.3 (git 2.25.1) at 2024-12-17 10:44:19 +0000