Change in osmo-e1-hardware[master]: icE1usb fw: Add multi-port support for e1.{c,h}

12 Jan 2022

laforge has submitted this change. ( https://gerrit.osmocom.org/c/osmo-e1-hardware/+/26839
)

Change subject: icE1usb fw: Add multi-port support for e1.{c,h}
......................................................................

icE1usb fw: Add multi-port support for e1.{c,h}

Currently all the users of those function just statically use port 0
only.

Signed-off-by: Sylvain Munaut &lt;tnt(a)246tNt.com&gt;
Change-Id: I17671be65543f5a2bf3d16ba2b5a5081eb38ebdf
---
M firmware/ice40-riscv/icE1usb/e1.c
M firmware/ice40-riscv/icE1usb/e1.h
M firmware/ice40-riscv/icE1usb/fw_app.c
M firmware/ice40-riscv/icE1usb/usb_e1.c
4 files changed, 151 insertions(+), 110 deletions(-)

Approvals:
  Jenkins Builder: Verified
  laforge: Looks good to me, approved

diff --git a/firmware/ice40-riscv/icE1usb/e1.c b/firmware/ice40-riscv/icE1usb/e1.c
index 6a4c73c..6a87c12 100644
--- a/firmware/ice40-riscv/icE1usb/e1.c
+++ b/firmware/ice40-riscv/icE1usb/e1.c
@@ -16,12 +16,13 @@
 
 #include "dma.h"
 #include "led.h" // FIXME
+#include "utils.h"
 
 
 // HW access
 // ---------
 
-static volatile struct e1_core * const e1_regs = (void *)(E1_CORE_BASE);
+static volatile struct e1_core * const e1_regs_base = (void *)(E1_CORE_BASE);
 static volatile uint8_t * const e1_data = (void *)(E1_DATA_BASE);
 
 
@@ -224,7 +225,7 @@
 	RECOVER	= 3,	/* after underflow, overflow or alignment  error */
 };
 
-static struct {
+struct e1_state {
 	struct {
 		uint32_t cr;
 		struct e1_fifo fifo;
@@ -240,30 +241,52 @@
 	} tx;
 
 	struct e1_error_count errors;
-} g_e1;
+};
+
+static struct e1_state g_e1[2];
+
+
+static volatile struct e1_core *
+_get_regs(int port)
+{
+	if ((port < 0) || (port > 1))
+		panic("_get_regs invalid port %d", port);
+	return &e1_regs_base[port];
+}
+
+static struct e1_state *
+_get_state(int port)
+{
+	if ((port < 0) || (port > 1))
+		panic("_get_state invalid port %d", port);
+	return &g_e1[port];
+}
 
 
 void
-e1_init(uint16_t rx_cr, uint16_t tx_cr)
+e1_init(int port, uint16_t rx_cr, uint16_t tx_cr)
 {
+	volatile struct e1_core *e1_regs = _get_regs(port);
+	struct e1_state *e1 = _get_state(port);
+
 	/* Global state init */
-	memset(&g_e1, 0x00, sizeof(g_e1));
+	memset(e1, 0x00, sizeof(struct e1_state));
 
 	/* Reset FIFOs */
-	e1f_reset(&g_e1.rx.fifo,   0, 128);
-	e1f_reset(&g_e1.tx.fifo, 128, 128);
+	e1f_reset(&e1->rx.fifo, (256 * port) +   0, 128);
+	e1f_reset(&e1->tx.fifo, (256 * port) + 128, 128);
 
 	/* Enable Rx */
-	g_e1.rx.cr = E1_RX_CR_ENABLE | rx_cr;
-	e1_regs->rx.csr = E1_RX_CR_OVFL_CLR | g_e1.rx.cr;
+	e1->rx.cr = E1_RX_CR_ENABLE | rx_cr;
+	e1_regs->rx.csr = E1_RX_CR_OVFL_CLR | e1->rx.cr;
 
 	/* Enable Tx */
-	g_e1.tx.cr = E1_TX_CR_ENABLE | tx_cr;
-	e1_regs->tx.csr = E1_TX_CR_UNFL_CLR | g_e1.tx.cr;
+	e1->tx.cr = E1_TX_CR_ENABLE | tx_cr;
+	e1_regs->tx.csr = E1_TX_CR_UNFL_CLR | e1->tx.cr;
 
 	/* State */
-	g_e1.rx.state = BOOT;
-	g_e1.tx.state = BOOT;
+	e1->rx.state = BOOT;
+	e1->tx.state = BOOT;
 }
 
 #define TXCR_PERMITTED (			\
@@ -274,25 +297,30 @@
 		E1_TX_CR_LOOPBACK_CROSS	)
 
 void
-e1_tx_config(uint16_t cr)
+e1_tx_config(int port, uint16_t cr)
 {
-	g_e1.tx.cr = (g_e1.tx.cr & ~TXCR_PERMITTED) | (cr & TXCR_PERMITTED);
-	e1_regs->tx.csr = g_e1.tx.cr;
+	volatile struct e1_core *e1_regs = _get_regs(port);
+	struct e1_state *e1 = _get_state(port);
+	e1->tx.cr = (e1->tx.cr & ~TXCR_PERMITTED) | (cr & TXCR_PERMITTED);
+	e1_regs->tx.csr = e1->tx.cr;
 }
 
 #define RXCR_PERMITTED (			\
 		E1_RX_CR_MODE_MFA )
 
 void
-e1_rx_config(uint16_t cr)
+e1_rx_config(int port, uint16_t cr)
 {
-	g_e1.rx.cr = (g_e1.rx.cr & ~RXCR_PERMITTED) | (cr & RXCR_PERMITTED);
-	e1_regs->rx.csr = g_e1.rx.cr;
+	volatile struct e1_core *e1_regs = _get_regs(port);
+	struct e1_state *e1 = _get_state(port);
+	e1->rx.cr = (e1->rx.cr & ~RXCR_PERMITTED) | (cr & RXCR_PERMITTED);
+	e1_regs->rx.csr = e1->rx.cr;
 }
 
 unsigned int
-e1_rx_need_data(unsigned int usb_addr, unsigned int max_frames, unsigned int *pos)
+e1_rx_need_data(int port, unsigned int usb_addr, unsigned int max_frames, unsigned int
*pos)
 {
+	struct e1_state *e1 = _get_state(port);
 	bool rai_received = false;
 	bool rai_possible = false;
 	unsigned int ofs;
@@ -301,13 +329,13 @@
 
 	while (max_frames) {
 		/* Get some data from the FIFO */
-		n_frames = e1f_frame_read(&g_e1.rx.fifo, &ofs, max_frames);
+		n_frames = e1f_frame_read(&e1->rx.fifo, &ofs, max_frames);
 		if (!n_frames)
 			break;
 
 		/* Give pos */
 		if (pos) {
-			*pos = ofs & g_e1.rx.fifo.mask;
+			*pos = ofs & e1->rx.fifo.mask;
 			pos = NULL;
 		}
 
@@ -339,11 +367,11 @@
 
 	if (rai_possible) {
 		if (rai_received) {
-			g_e1.errors.flags |= E1_ERR_F_RAI;
-			e1_platform_led_set(0, E1P_LED_YELLOW, E1P_LED_ST_ON);
+			e1->errors.flags |= E1_ERR_F_RAI;
+			e1_platform_led_set(port, E1P_LED_YELLOW, E1P_LED_ST_ON);
 		} else {
-			g_e1.errors.flags &= ~E1_ERR_F_RAI;
-			e1_platform_led_set(0, E1P_LED_YELLOW, E1P_LED_ST_OFF);
+			e1->errors.flags &= ~E1_ERR_F_RAI;
+			e1_platform_led_set(port, E1P_LED_YELLOW, E1P_LED_ST_OFF);
 		}
 	}
 
@@ -351,16 +379,18 @@
 }
 
 unsigned int
-e1_tx_feed_data(unsigned int usb_addr, unsigned int frames)
+e1_tx_feed_data(int port, unsigned int usb_addr, unsigned int frames)
 {
+	struct e1_state *e1 = _get_state(port);
 	unsigned int ofs;
 	int n_frames;
 
 	while (frames) {
 		/* Get some space in FIFO */
-		n_frames = e1f_frame_write(&g_e1.tx.fifo, &ofs, frames);
+		n_frames = e1f_frame_write(&e1->tx.fifo, &ofs, frames);
 		if (!n_frames) {
-			printf("[!] TX FIFO Overflow %d %d\n", frames, n_frames);
+			printf("[!] TX FIFO Overflow (port=%d, req=%d, done=%d)\n", port, frames,
n_frames);
+			e1f_debug(&e1->tx.fifo, "TX");
 			break;
 		}
 
@@ -379,65 +409,70 @@
 }
 
 unsigned int
-e1_tx_level(void)
+e1_tx_level(int port)
 {
-	return e1f_valid_frames(&g_e1.tx.fifo);
+	struct e1_state *e1 = _get_state(port);
+	return e1f_valid_frames(&e1->tx.fifo);
 }
 
 unsigned int
-e1_rx_level(void)
+e1_rx_level(int port)
 {
-	return e1f_valid_frames(&g_e1.rx.fifo);
+	struct e1_state *e1 = _get_state(port);
+	return e1f_valid_frames(&e1->rx.fifo);
 }
 
 const struct e1_error_count *
-e1_get_error_count(void)
+e1_get_error_count(int port)
 {
-	return &g_e1.errors;
+	struct e1_state *e1 = _get_state(port);
+	return &e1->errors;
 }
 
 void
-e1_poll(void)
+e1_poll(int port)
 {
+	volatile struct e1_core *e1_regs = _get_regs(port);
+	struct e1_state *e1 = _get_state(port);
 	uint32_t bd;
 	unsigned int ofs;
 
 	/* Active ? */
-	if ((g_e1.rx.state == IDLE) && (g_e1.tx.state == IDLE))
+	if ((e1->rx.state == IDLE) && (e1->tx.state == IDLE))
 		return;
 
 	/* HACK: LED link status */
 	if (e1_regs->rx.csr & E1_RX_SR_ALIGNED) {
-		e1_platform_led_set(0, E1P_LED_GREEN, E1P_LED_ST_ON);
+		e1_platform_led_set(port, E1P_LED_GREEN, E1P_LED_ST_ON);
 		led_color(0, 48, 0);
-		g_e1.errors.flags &= ~(E1_ERR_F_LOS|E1_ERR_F_ALIGN_ERR);
+		e1->errors.flags &= ~(E1_ERR_F_LOS|E1_ERR_F_ALIGN_ERR);
 	} else {
-		e1_platform_led_set(0, E1P_LED_GREEN, E1P_LED_ST_BLINK);
+		e1_platform_led_set(port, E1P_LED_GREEN, E1P_LED_ST_BLINK);
 		led_color(48, 0, 0);
-		g_e1.errors.flags |= E1_ERR_F_ALIGN_ERR;
+		e1->errors.flags |= E1_ERR_F_ALIGN_ERR;
 		/* TODO: completely off if rx tick counter not incrementing */
 	}
 
 	/* Recover any done TX BD */
 	while ( (bd = e1_regs->tx.bd) & E1_BD_VALID ) {
-		e1f_multiframe_read_discard(&g_e1.tx.fifo);
-		g_e1.tx.in_flight--;
+		e1f_multiframe_read_discard(&e1->tx.fifo);
+		e1->tx.in_flight--;
 	}
 
 	/* Recover any done RX BD */
 	while ( (bd = e1_regs->rx.bd) & E1_BD_VALID ) {
 		/* FIXME: CRC status ? */
-		e1f_multiframe_write_commit(&g_e1.rx.fifo);
+		e1f_multiframe_write_commit(&e1->rx.fifo);
 		if ((bd & (E1_BD_CRC0 | E1_BD_CRC1)) != (E1_BD_CRC0 | E1_BD_CRC1)) {
-			printf("b: %03x\n", bd);
-			g_e1.errors.crc++;
+			printf("[!] E1 crc err (port=%d, bd=%03x)\n", port, bd);
+			e1->errors.crc++;
 		}
-		g_e1.rx.in_flight--;
+		e1->rx.in_flight--;
 	}
 
 	/* Boot procedure */
-	if (g_e1.tx.state == BOOT) {
-		if (e1f_unseen_frames(&g_e1.tx.fifo) < (16 * 5))
+	if (e1->tx.state == BOOT) {
+		if (e1f_unseen_frames(&e1->tx.fifo) < (16 * 5))
 			return;
 		/* HACK: LED flow status */
 		led_blink(true, 200, 1000);
@@ -446,88 +481,90 @@
 
 	/* Handle RX */
 		/* Misalign ? */
-	if (g_e1.rx.state == RUN) {
+	if (e1->rx.state == RUN) {
 		if (!(e1_regs->rx.csr & E1_RX_SR_ALIGNED)) {
-			printf("[!] E1 rx misalign\n");
-			g_e1.rx.state = RECOVER;
-			g_e1.errors.align++;
+			printf("[!] E1 rx misalign (port=%d)\n", port);
+			e1->rx.state = RECOVER;
+			e1->errors.align++;
 		}
 	}
 
 		/* Overflow ? */
-	if (g_e1.rx.state == RUN) {
+	if (e1->rx.state == RUN) {
 		if (e1_regs->rx.csr & E1_RX_SR_OVFL) {
-			printf("[!] E1 overflow %d\n", g_e1.rx.in_flight);
-			g_e1.rx.state = RECOVER;
-			g_e1.errors.ovfl++;
+			printf("[!] E1 overflow (port=%d, inf=%d)\n", port, e1->rx.in_flight);
+			e1->rx.state = RECOVER;
+			e1->errors.ovfl++;
 		}
 	}
 
 		/* Recover ready ? */
-	if (g_e1.rx.state == RECOVER) {
-		if (g_e1.rx.in_flight != 0)
+	if (e1->rx.state == RECOVER) {
+		if (e1->rx.in_flight != 0)
 			goto done_rx;
-		e1f_multiframe_empty(&g_e1.rx.fifo);
+		e1f_multiframe_empty(&e1->rx.fifo);
 	}
 
 		/* Fill new RX BD */
-	while (g_e1.rx.in_flight < 4) {
-		if (!e1f_multiframe_write_prepare(&g_e1.rx.fifo, &ofs))
+	while (e1->rx.in_flight < 4) {
+		if (!e1f_multiframe_write_prepare(&e1->rx.fifo, &ofs))
 			break;
 		e1_regs->rx.bd = e1f_ofs_to_mf(ofs);
-		g_e1.rx.in_flight++;
+		e1->rx.in_flight++;
 	}
 
 		/* Clear overflow if needed */
-	if (g_e1.rx.state != RUN) {
-		e1_regs->rx.csr = g_e1.rx.cr | E1_RX_CR_OVFL_CLR;
-		g_e1.rx.state = RUN;
+	if (e1->rx.state != RUN) {
+		e1_regs->rx.csr = e1->rx.cr | E1_RX_CR_OVFL_CLR;
+		e1->rx.state = RUN;
 	}
 done_rx:
 
 	/* Handle TX */
 		/* Underflow ? */
-	if (g_e1.tx.state == RUN) {
+	if (e1->tx.state == RUN) {
 		if (e1_regs->tx.csr & E1_TX_SR_UNFL) {
-			printf("[!] E1 underflow %d\n", g_e1.tx.in_flight);
-			g_e1.tx.state = RECOVER;
-			g_e1.errors.unfl++;
+			printf("[!] E1 underflow (port=%d, inf=%d)\n", port, e1->tx.in_flight);
+			e1->tx.state = RECOVER;
+			e1->errors.unfl++;
 		}
 	}
 
 		/* Recover ready ? */
-	if (g_e1.tx.state == RECOVER) {
-		if (e1f_unseen_frames(&g_e1.tx.fifo) < (16 * 5))
+	if (e1->tx.state == RECOVER) {
+		if (e1f_unseen_frames(&e1->tx.fifo) < (16 * 5))
 			return;
 	}
 
 		/* Fill new TX BD */
-	while (g_e1.tx.in_flight < 4) {
-		if (!e1f_multiframe_read_peek(&g_e1.tx.fifo, &ofs))
+	while (e1->tx.in_flight < 4) {
+		if (!e1f_multiframe_read_peek(&e1->tx.fifo, &ofs))
 			break;
 		e1_regs->tx.bd = e1f_ofs_to_mf(ofs);
-		g_e1.tx.in_flight++;
+		e1->tx.in_flight++;
 	}
 
 		/* Clear underflow if needed */
-	if (g_e1.tx.state != RUN) {
-		e1_regs->tx.csr = g_e1.tx.cr | E1_TX_CR_UNFL_CLR;
-		g_e1.tx.state = RUN;
+	if (e1->tx.state != RUN) {
+		e1_regs->tx.csr = e1->tx.cr | E1_TX_CR_UNFL_CLR;
+		e1->tx.state = RUN;
 	}
 }
 
 void
-e1_debug_print(bool data)
+e1_debug_print(int port, bool data)
 {
+	volatile struct e1_core *e1_regs = _get_regs(port);
+	struct e1_state *e1 = _get_state(port);
 	volatile uint8_t *p;
 
-	puts("E1\n");
+	printf("E1 port %d\n", port);
 	printf("CSR: Rx %04x / Tx %04x\n", e1_regs->rx.csr, e1_regs->tx.csr);
-	printf("InF: Rx %d / Tx %d\n", g_e1.rx.in_flight, g_e1.tx.in_flight);
-	printf("Sta: Rx %d / Tx %d\n", g_e1.rx.state, g_e1.tx.state);
+	printf("InF: Rx %d / Tx %d\n", e1->rx.in_flight, e1->tx.in_flight);
+	printf("Sta: Rx %d / Tx %d\n", e1->rx.state, e1->tx.state);
 
-	e1f_debug(&g_e1.rx.fifo, "Rx FIFO");
-	e1f_debug(&g_e1.tx.fifo, "Tx FIFO");
+	e1f_debug(&e1->rx.fifo, "Rx FIFO");
+	e1f_debug(&e1->tx.fifo, "Tx FIFO");
 
 	if (data) {
 		puts("\nE1 Data\n");
diff --git a/firmware/ice40-riscv/icE1usb/e1.h b/firmware/ice40-riscv/icE1usb/e1.h
index 862d568..a93a881 100644
--- a/firmware/ice40-riscv/icE1usb/e1.h
+++ b/firmware/ice40-riscv/icE1usb/e1.h
@@ -10,20 +10,20 @@
 
 /* control */
 
-void e1_init(uint16_t rx_cr, uint16_t tx_cr);
-void e1_poll(void);
-void e1_debug_print(bool data);
+void e1_init(int port, uint16_t rx_cr, uint16_t tx_cr);
+void e1_poll(int port);
+void e1_debug_print(int port, bool data);
 
-void e1_tx_config(uint16_t cr);
-void e1_rx_config(uint16_t cr);
+void e1_tx_config(int port, uint16_t cr);
+void e1_rx_config(int port, uint16_t cr);
 
 
 /* data flow */
 
-unsigned int e1_rx_need_data(unsigned int usb_addr, unsigned int max_len, unsigned int
*pos);
-unsigned int e1_tx_feed_data(unsigned int usb_addr, unsigned int len);
-unsigned int e1_tx_level(void);
-unsigned int e1_rx_level(void);
+unsigned int e1_rx_need_data(int port, unsigned int usb_addr, unsigned int max_len,
unsigned int *pos);
+unsigned int e1_tx_feed_data(int port, unsigned int usb_addr, unsigned int len);
+unsigned int e1_tx_level(int port);
+unsigned int e1_rx_level(int port);
 
 
 /* error reporting */
@@ -40,7 +40,7 @@
 	uint8_t flags;
 };
 
-const struct e1_error_count *e1_get_error_count(void);
+const struct e1_error_count *e1_get_error_count(int port);
 
 
 /* external function provided by the platform; used by E1 driver to control LEDs */
diff --git a/firmware/ice40-riscv/icE1usb/fw_app.c
b/firmware/ice40-riscv/icE1usb/fw_app.c
index 39173f2..3340f4a 100644
--- a/firmware/ice40-riscv/icE1usb/fw_app.c
+++ b/firmware/ice40-riscv/icE1usb/fw_app.c
@@ -101,7 +101,7 @@
 	usb_e1_init();
 
 	/* Start */
-	e1_init(0, 0);
+	e1_init(0, 0, 0);
 	led_state(true);
 	usb_connect();
 
@@ -131,10 +131,10 @@
 				boot_dfu();
 				break;
 			case 'o':
-				e1_debug_print(false);
+				e1_debug_print(0, false);
 				break;
 			case 'O':
-				e1_debug_print(true);
+				e1_debug_print(0, true);
 				break;
 			case 'c':
 				usb_connect();
@@ -151,7 +151,7 @@
 		usb_poll();
 
 		/* E1 poll */
-		e1_poll();
+		e1_poll(0);
 		usb_e1_run();
 	}
 }
diff --git a/firmware/ice40-riscv/icE1usb/usb_e1.c
b/firmware/ice40-riscv/icE1usb/usb_e1.c
index fe94698..8e78ffa 100644
--- a/firmware/ice40-riscv/icE1usb/usb_e1.c
+++ b/firmware/ice40-riscv/icE1usb/usb_e1.c
@@ -64,7 +64,7 @@
 		val = 8192;
 
 	/* Bias depending on TX fifo level */
-	level = e1_tx_level();
+	level = e1_tx_level(0);
 	if (level < (3 * 16))
 		val += 256;
 	else if (level > (8 * 16))
@@ -90,7 +90,7 @@
 	ep_regs = _get_ep_regs(USB_EP_E1_INT(0));
 
 	if ((ep_regs->bd[0].csr & USB_BD_STATE_MSK) != USB_BD_STATE_RDY_DATA) {
-		const struct e1_error_count *cur_err = e1_get_error_count();
+		const struct e1_error_count *cur_err = e1_get_error_count(0);
 		if (memcmp(cur_err, &g_usb_e1.last_err, sizeof(*cur_err))) {
 			struct ice1usb_irq errmsg = {
 				.type = ICE1USB_IRQ_T_ERRCNT,
@@ -126,7 +126,7 @@
 			puts("Err EP IN\n");
 
 		/* Get some data from E1 */
-		int n = e1_rx_level();
+		int n = e1_rx_level(0);
 
 		if (n > 64)
 			n = 12;
@@ -137,7 +137,7 @@
 		else if (!n)
 			break;
 
-		n = e1_rx_need_data((ptr >> 2) + 1, n, &pos);
+		n = e1_rx_need_data(0, (ptr >> 2) + 1, n, &pos);
 
 		/* Write header: currently version and pos (mfr/fr number) */
 		hdr = (0 << 28) | (pos & 0xff);
@@ -173,7 +173,7 @@
 		/* Empty data into the FIFO */
 		int n = ((int)(csr & USB_BD_LEN_MSK) - 6) / 32;
 		if (n > 0)
-			e1_tx_feed_data((ptr >> 2) + 1, n);
+			e1_tx_feed_data(0, (ptr >> 2) + 1, n);
 
 refill:
 		/* Refill it */
@@ -223,16 +223,20 @@
 static void _perform_tx_config(void)
 {
 	const struct ice1usb_tx_config *cfg = &g_usb_e1.tx_cfg;
-	e1_tx_config(   ((cfg->mode & 3) << 1) |
-			((cfg->timing & 1) << 3) |
-			((cfg->alarm & 1) << 4) |
-			((cfg->ext_loopback & 3) << 5) );
+	e1_tx_config(0,
+		((cfg->mode & 3) << 1) |
+		((cfg->timing & 1) << 3) |
+		((cfg->alarm & 1) << 4) |
+		((cfg->ext_loopback & 3) << 5)
+	);
 }
 
 static void _perform_rx_config(void)
 {
 	const struct ice1usb_rx_config *cfg = &g_usb_e1.rx_cfg;
-	e1_rx_config((cfg->mode << 1));
+	e1_rx_config(0,
+		(cfg->mode << 1)
+	);
 }
 
 static enum usb_fnd_resp
@@ -263,12 +267,12 @@
 	switch (g_usb_e1.running) {
 	case false:
 		/* Disable E1 rx/tx */
-		e1_init(0, 0);
+		e1_init(0, 0, 0);
 		break;
 
 	case true:
 		/* Reset and Re-Enable E1 */
-		e1_init(0, 0);
+		e1_init(0, 0, 0);
 		_perform_rx_config();
 		_perform_tx_config();
 

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Gerrit-Project: osmo-e1-hardware
Gerrit-Branch: master
Gerrit-Change-Id: I17671be65543f5a2bf3d16ba2b5a5081eb38ebdf
Gerrit-Change-Number: 26839
Gerrit-PatchSet: 1
Gerrit-Owner: tnt &lt;tnt(a)246tNt.com&gt;
Gerrit-Reviewer: Jenkins Builder
Gerrit-Reviewer: laforge &lt;laforge(a)osmocom.org&gt;
Gerrit-MessageType: merged



    

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Change in osmo-e1-hardware[master]: icE1usb fw: Add multi-port support for e1.{c,h}