cxp_phys: low speed serial & GTX setup

downconn: add QPLL & GTX setup
downconn: add DRP to change linerate up to 12.5Gbps
downconn testing: add txuserclk config
upconn: add low speed serital setup
upconn & downconn: add linerate changer

src/libboard_artiq/src/cxp_phys.rs

@@ -0,0 +1,217 @@
+use embedded_hal::prelude::_embedded_hal_blocking_delay_DelayUs;
+use libboard_zynq::{println, timer::GlobalTimer};
+use log::info;
+
+use crate::pl::{csr, csr::CXP};
+
+pub const CXP_CHANNELS: usize = csr::CXP_LEN;
+
+#[derive(Clone, Copy, Debug)]
+#[allow(non_camel_case_types)]
+pub enum CXP_SPEED {
+    CXP_1,
+    CXP_2,
+    CXP_3,
+    CXP_5,
+    CXP_6,
+    CXP_10,
+    CXP_12,
+}
+
+pub fn setup(timer: &mut GlobalTimer) {
+    down_conn::setup(timer);
+    up_conn::setup();
+    change_linerate(CXP_SPEED::CXP_1);
+}
+
+pub fn change_linerate(speed: CXP_SPEED) {
+    info!("Changing all channels datarate to {:?}", speed);
+    down_conn::change_linerate(speed);
+    up_conn::change_linerate(speed);
+}
+
+mod up_conn {
+    use super::*;
+
+    pub fn setup() {
+        unsafe {
+            csr::cxp_phys::upconn_tx_enable_write(1);
+        }
+    }
+
+    pub fn change_linerate(speed: CXP_SPEED) {
+        unsafe {
+            match speed {
+                CXP_SPEED::CXP_1 | CXP_SPEED::CXP_2 | CXP_SPEED::CXP_3 | CXP_SPEED::CXP_5 | CXP_SPEED::CXP_6 => {
+                    csr::cxp_phys::upconn_bitrate2x_enable_write(0);
+                }
+                CXP_SPEED::CXP_10 | CXP_SPEED::CXP_12 => {
+                    csr::cxp_phys::upconn_bitrate2x_enable_write(1);
+                }
+            };
+            csr::cxp_phys::upconn_clk_reset_write(1);
+        }
+    }
+}
+
+mod down_conn {
+    use super::*;
+
+    pub fn setup(timer: &mut GlobalTimer) {
+        unsafe {
+            csr::cxp_phys::downconn_qpll_reset_write(1);
+            info!("waiting for QPLL/CPLL to lock...");
+            while csr::cxp_phys::downconn_qpll_locked_read() != 1 {}
+            info!("QPLL locked");
+
+            for channel in 0..CXP_CHANNELS {
+                (CXP[channel].downconn_rx_start_init_write)(1);
+            }
+
+            // DEBUG: printout
+            info!("waiting for rx setup...");
+            timer.delay_us(50_000);
+            for channel in 0..CXP_CHANNELS {
+                info!("rx_phaligndone = {}", (CXP[channel].downconn_rxinit_phaligndone_read)(),);
+            }
+        }
+    }
+
+    pub fn change_linerate(speed: CXP_SPEED) {
+        change_qpll_fb_divider(speed);
+        change_gtx_divider(speed);
+        change_cdr_cfg(speed);
+
+        unsafe {
+            csr::cxp_phys::downconn_qpll_reset_write(1);
+            info!("waiting for QPLL/CPLL to lock...");
+            while csr::cxp_phys::downconn_qpll_locked_read() != 1 {}
+            info!("QPLL locked");
+
+            for channel in 0..CXP_CHANNELS {
+                (CXP[channel].downconn_rx_restart_write)(1);
+            }
+        }
+    }
+
+    fn change_qpll_fb_divider(speed: CXP_SPEED) {
+        let qpll_div_reg = match speed {
+            CXP_SPEED::CXP_1 | CXP_SPEED::CXP_2 | CXP_SPEED::CXP_5 | CXP_SPEED::CXP_10 => 0x0120, // FB_Divider = 80
+            CXP_SPEED::CXP_3 | CXP_SPEED::CXP_6 | CXP_SPEED::CXP_12 => 0x0170,                    // FB_Divider = 100
+        };
+
+        // DEBUG:
+        println!("QPLL DRP:");
+        println!("0x36 = {:#06x}", qpll_read(0x36));
+        qpll_write(0x36, qpll_div_reg);
+        println!("0x36 = {:#06x}", qpll_read(0x36));
+    }
+
+    fn change_gtx_divider(speed: CXP_SPEED) {
+        let div_reg = match speed {
+            CXP_SPEED::CXP_1 => 0x33,                      // RXOUT_DIV = 8
+            CXP_SPEED::CXP_2 | CXP_SPEED::CXP_3 => 0x22,   // RXOUT_DIV = 4
+            CXP_SPEED::CXP_5 | CXP_SPEED::CXP_6 => 0x11,   // RXOUT_DIV = 2
+            CXP_SPEED::CXP_10 | CXP_SPEED::CXP_12 => 0x00, // RXOUT_DIV = 1
+        };
+
+        // DEBUG:
+        println!("RX GTX DRP:");
+        for channel in 0..CXP_CHANNELS {
+            println!("channel {}, 0x88 = {:#06x}", channel, gtx_read(channel, 0x88));
+            gtx_write(channel, 0x88, div_reg);
+            println!("channel {}, 0x88 = {:#06x}", channel, gtx_read(channel, 0x88));
+        }
+    }
+
+    fn change_cdr_cfg(speed: CXP_SPEED) {
+        struct CdrConfig {
+            pub cfg_reg0: u16, // addr = 0xA8
+            pub cfg_reg1: u16, // addr = 0xA9
+            pub cfg_reg2: u16, // addr = 0xAA
+            pub cfg_reg3: u16, // addr = 0xAB
+            pub cfg_reg4: u16, // addr = 0xAC
+        }
+
+        let cdr_cfg = match speed {
+            // when RXOUT_DIV = 8
+            CXP_SPEED::CXP_1 => CdrConfig {
+                cfg_reg0: 0x0020,
+                cfg_reg1: 0x1008,
+                cfg_reg2: 0x23FF,
+                cfg_reg3: 0x0000,
+                cfg_reg4: 0x0003,
+            },
+            // when RXOUT_DIV = 4
+            CXP_SPEED::CXP_2 | CXP_SPEED::CXP_5 => CdrConfig {
+                cfg_reg0: 0x0020,
+                cfg_reg1: 0x1010,
+                cfg_reg2: 0x23FF,
+                cfg_reg3: 0x0000,
+                cfg_reg4: 0x0003,
+            },
+            // when RXOUT_DIV= 2
+            CXP_SPEED::CXP_3 | CXP_SPEED::CXP_6 => CdrConfig {
+                cfg_reg0: 0x0020,
+                cfg_reg1: 0x1020,
+                cfg_reg2: 0x23FF,
+                cfg_reg3: 0x0000,
+                cfg_reg4: 0x0003,
+            },
+            // when RXOUT_DIV= 1
+            CXP_SPEED::CXP_10 | CXP_SPEED::CXP_12 => CdrConfig {
+                cfg_reg0: 0x0020,
+                cfg_reg1: 0x1040,
+                cfg_reg2: 0x23FF,
+                cfg_reg3: 0x0000,
+                cfg_reg4: 0x000B,
+            },
+        };
+
+        for channel in 0..CXP_CHANNELS {
+            gtx_write(channel, 0x0A8, cdr_cfg.cfg_reg0);
+            gtx_write(channel, 0x0A9, cdr_cfg.cfg_reg1);
+            gtx_write(channel, 0x0AA, cdr_cfg.cfg_reg2);
+            gtx_write(channel, 0x0AB, cdr_cfg.cfg_reg3);
+            gtx_write(channel, 0x0AC, cdr_cfg.cfg_reg4);
+        }
+    }
+
+    #[allow(dead_code)]
+    fn gtx_read(channel: usize, address: u16) -> u16 {
+        unsafe {
+            (CXP[channel].downconn_gtx_daddr_write)(address);
+            (CXP[channel].downconn_gtx_dread_write)(1);
+            while (CXP[channel].downconn_gtx_dready_read)() != 1 {}
+            (CXP[channel].downconn_gtx_dout_read)()
+        }
+    }
+
+    fn gtx_write(channel: usize, address: u16, value: u16) {
+        unsafe {
+            (CXP[channel].downconn_gtx_daddr_write)(address);
+            (CXP[channel].downconn_gtx_din_write)(value);
+            (CXP[channel].downconn_gtx_din_stb_write)(1);
+            while (CXP[channel].downconn_gtx_dready_read)() != 1 {}
+        }
+    }
+
+    #[allow(dead_code)]
+    fn qpll_read(address: u8) -> u16 {
+        unsafe {
+            csr::cxp_phys::downconn_qpll_daddr_write(address);
+            csr::cxp_phys::downconn_qpll_dread_write(1);
+            while csr::cxp_phys::downconn_qpll_dready_read() != 1 {}
+            csr::cxp_phys::downconn_qpll_dout_read()
+        }
+    }
+
+    fn qpll_write(address: u8, value: u16) {
+        unsafe {
+            csr::cxp_phys::downconn_qpll_daddr_write(address);
+            csr::cxp_phys::downconn_qpll_din_write(value);
+            csr::cxp_phys::downconn_qpll_din_stb_write(1);
+            while csr::cxp_phys::downconn_qpll_dready_read() != 1 {}
+        }
+    }
+}