// SPDX-License-Identifier: GPL-2.0-or-later /* * AppliedMicro X-Gene Multi-purpose PHY driver * * Copyright (c) 2014, Applied Micro Circuits Corporation * Author: Loc Ho <lho@apm.com> * Tuan Phan <tphan@apm.com> * Suman Tripathi <stripathi@apm.com> * * The APM X-Gene PHY consists of two PLL clock macro's (CMU) and lanes. * The first PLL clock macro is used for internal reference clock. The second * PLL clock macro is used to generate the clock for the PHY. This driver * configures the first PLL CMU, the second PLL CMU, and programs the PHY to * operate according to the mode of operation. The first PLL CMU is only * required if internal clock is enabled. * * Logical Layer Out Of HW module units: * * ----------------- * | Internal | |------| * | Ref PLL CMU |----| | ------------- --------- * ------------ ---- | MUX |-----|PHY PLL CMU|----| Serdes| * | | | | --------- * External Clock ------| | ------------- * |------| * * The Ref PLL CMU CSR (Configuration System Registers) is accessed * indirectly from the SDS offset at 0x2000. It is only required for * internal reference clock. * The PHY PLL CMU CSR is accessed indirectly from the SDS offset at 0x0000. * The Serdes CSR is accessed indirectly from the SDS offset at 0x0400. * * The Ref PLL CMU can be located within the same PHY IP or outside the PHY IP * due to shared Ref PLL CMU. For PHY with Ref PLL CMU shared with another IP, * it is located outside the PHY IP. This is the case for the PHY located * at 0x1f23a000 (SATA Port 4/5). For such PHY, another resource is required * to located the SDS/Ref PLL CMU module and its clock for that IP enabled. * * Currently, this driver only supports Gen3 SATA mode with external clock.
*/ #include <linux/module.h> #include <linux/of.h> #include <linux/platform_device.h> #include <linux/io.h> #include <linux/delay.h> #include <linux/phy/phy.h> #include <linux/clk.h>
/* Max 2 lanes per a PHY unit */ #define MAX_LANE 2
/* Clock macro type */ enum cmu_type_t {
REF_CMU = 0, /* Clock macro is the internal reference clock */
PHY_CMU = 1, /* Clock macro is the PLL for the Serdes */
};
enum mux_type_t {
MUX_SELECT_ATA = 0, /* Switch the MUX to ATA */
MUX_SELECT_SGMMII = 0, /* Switch the MUX to SGMII */
};
/* Configure lane for 20-bits */ if (cmu_type == PHY_CMU) {
cmu_rd(ctx, cmu_type, CMU_REG9, &val);
val = CMU_REG9_TX_WORD_MODE_CH1_SET(val,
CMU_REG9_WORD_LEN_20BIT);
val = CMU_REG9_TX_WORD_MODE_CH0_SET(val,
CMU_REG9_WORD_LEN_20BIT);
val = CMU_REG9_PLL_POST_DIVBY2_SET(val, 0x1); if (!preA3Chip) {
val = CMU_REG9_VBG_BYPASSB_SET(val, 0x0);
val = CMU_REG9_IGEN_BYPASS_SET(val , 0x0);
}
cmu_wr(ctx, cmu_type, CMU_REG9, val);
if (!preA3Chip) {
cmu_rd(ctx, cmu_type, CMU_REG10, &val);
val = CMU_REG10_VREG_REFSEL_SET(val, 0x1);
cmu_wr(ctx, cmu_type, CMU_REG10, val);
}
}
cmu_rd(ctx, cmu_type, CMU_REG16, &val);
val = CMU_REG16_CALIBRATION_DONE_OVERRIDE_SET(val, 0x1);
val = CMU_REG16_BYPASS_PLL_LOCK_SET(val, 0x1); if (cmu_type == REF_CMU || preA3Chip)
val = CMU_REG16_VCOCAL_WAIT_BTW_CODE_SET(val, 0x4); else
val = CMU_REG16_VCOCAL_WAIT_BTW_CODE_SET(val, 0x7);
cmu_wr(ctx, cmu_type, CMU_REG16, val);
/* Configure for SATA */
cmu_rd(ctx, cmu_type, CMU_REG30, &val);
val = CMU_REG30_PCIE_MODE_SET(val, 0x0);
val = CMU_REG30_LOCK_COUNT_SET(val, 0x3);
cmu_wr(ctx, cmu_type, CMU_REG30, val);
/* Disable state machine bypass */
cmu_wr(ctx, cmu_type, CMU_REG31, 0xF);
cmu_rd(ctx, cmu_type, CMU_REG32, &val);
val = CMU_REG32_PVT_CAL_WAIT_SEL_SET(val, 0x3); if (cmu_type == REF_CMU || preA3Chip)
val = CMU_REG32_IREF_ADJ_SET(val, 0x3); else
val = CMU_REG32_IREF_ADJ_SET(val, 0x1);
cmu_wr(ctx, cmu_type, CMU_REG32, val);
/* Set SSC modulation value */
cmu_rd(ctx, cmu_type, CMU_REG35, &val);
val = CMU_REG35_PLL_SSC_MOD_SET(val, 98);
cmu_wr(ctx, cmu_type, CMU_REG35, val);
/* Enable SSC, set vertical step and DSM value */
cmu_rd(ctx, cmu_type, CMU_REG36, &val);
val = CMU_REG36_PLL_SSC_VSTEP_SET(val, 30);
val = CMU_REG36_PLL_SSC_EN_SET(val, 1);
val = CMU_REG36_PLL_SSC_DSMSEL_SET(val, 1);
cmu_wr(ctx, cmu_type, CMU_REG36, val);
/* Force VCO calibration to restart */
cmu_toggle1to0(ctx, cmu_type, CMU_REG32,
CMU_REG32_FORCE_VCOCAL_START_MASK);
}
staticvoid xgene_phy_sata_cfg_lanes(struct xgene_phy_ctx *ctx)
{
u32 val;
u32 reg; int i; int lane;
for (lane = 0; lane < MAX_LANE; lane++) {
serdes_wr(ctx, lane, RXTX_REG147, 0x6);
/* Set boost control for quarter, half, and full rate */
serdes_rd(ctx, lane, RXTX_REG0, &val);
val = RXTX_REG0_CTLE_EQ_HR_SET(val, 0x10);
val = RXTX_REG0_CTLE_EQ_QR_SET(val, 0x10);
val = RXTX_REG0_CTLE_EQ_FR_SET(val, 0x10);
serdes_wr(ctx, lane, RXTX_REG0, val);
/* Set boost control value */
serdes_rd(ctx, lane, RXTX_REG1, &val);
val = RXTX_REG1_RXACVCM_SET(val, 0x7);
val = RXTX_REG1_CTLE_EQ_SET(val,
ctx->sata_param.txboostgain[lane * 3 +
ctx->sata_param.speed[lane]]);
serdes_wr(ctx, lane, RXTX_REG1, val);
/* Latch VTT value based on the termination to ground and * enable TX FIFO
*/
serdes_rd(ctx, lane, RXTX_REG2, &val);
val = RXTX_REG2_VTT_ENA_SET(val, 0x1);
val = RXTX_REG2_VTT_SEL_SET(val, 0x1);
val = RXTX_REG2_TX_FIFO_ENA_SET(val, 0x1);
serdes_wr(ctx, lane, RXTX_REG2, val);
/* Configure Tx for 20-bits */
serdes_rd(ctx, lane, RXTX_REG4, &val);
val = RXTX_REG4_TX_WORD_MODE_SET(val, CMU_REG9_WORD_LEN_20BIT);
serdes_wr(ctx, lane, RXTX_REG4, val);
if (!preA3Chip) {
serdes_rd(ctx, lane, RXTX_REG1, &val);
val = RXTX_REG1_RXVREG1_SET(val, 0x2);
val = RXTX_REG1_RXIREF_ADJ_SET(val, 0x2);
serdes_wr(ctx, lane, RXTX_REG1, val);
}
/* Set pre-emphasis first 1 and 2, and post-emphasis values */
serdes_rd(ctx, lane, RXTX_REG5, &val);
val = RXTX_REG5_TX_CN1_SET(val,
ctx->sata_param.txprecursor_cn1[lane * 3 +
ctx->sata_param.speed[lane]]);
val = RXTX_REG5_TX_CP1_SET(val,
ctx->sata_param.txpostcursor_cp1[lane * 3 +
ctx->sata_param.speed[lane]]);
val = RXTX_REG5_TX_CN2_SET(val,
ctx->sata_param.txprecursor_cn2[lane * 3 +
ctx->sata_param.speed[lane]]);
serdes_wr(ctx, lane, RXTX_REG5, val);
/* Set TX amplitude value */
serdes_rd(ctx, lane, RXTX_REG6, &val);
val = RXTX_REG6_TXAMP_CNTL_SET(val,
ctx->sata_param.txamplitude[lane * 3 +
ctx->sata_param.speed[lane]]);
val = RXTX_REG6_TXAMP_ENA_SET(val, 0x1);
val = RXTX_REG6_TX_IDLE_SET(val, 0x0);
val = RXTX_REG6_RX_BIST_RESYNC_SET(val, 0x0);
val = RXTX_REG6_RX_BIST_ERRCNT_RD_SET(val, 0x0);
serdes_wr(ctx, lane, RXTX_REG6, val);
/* Configure Rx for 20-bits */
serdes_rd(ctx, lane, RXTX_REG7, &val);
val = RXTX_REG7_BIST_ENA_RX_SET(val, 0x0);
val = RXTX_REG7_RX_WORD_MODE_SET(val, CMU_REG9_WORD_LEN_20BIT);
serdes_wr(ctx, lane, RXTX_REG7, val);
/* Set CDR and LOS values and enable Rx SSC */
serdes_rd(ctx, lane, RXTX_REG8, &val);
val = RXTX_REG8_CDR_LOOP_ENA_SET(val, 0x1);
val = RXTX_REG8_CDR_BYPASS_RXLOS_SET(val, 0x0);
val = RXTX_REG8_SSC_ENABLE_SET(val, 0x1);
val = RXTX_REG8_SD_DISABLE_SET(val, 0x0);
val = RXTX_REG8_SD_VREF_SET(val, 0x4);
serdes_wr(ctx, lane, RXTX_REG8, val);
/* Set phase adjust upper/lower limits */
serdes_rd(ctx, lane, RXTX_REG11, &val);
val = RXTX_REG11_PHASE_ADJUST_LIMIT_SET(val, 0x0);
serdes_wr(ctx, lane, RXTX_REG11, val);
/* Enable Latch Off; disable SUMOS and Tx termination */
serdes_rd(ctx, lane, RXTX_REG12, &val);
val = RXTX_REG12_LATCH_OFF_ENA_SET(val, 0x1);
val = RXTX_REG12_SUMOS_ENABLE_SET(val, 0x0);
val = RXTX_REG12_RX_DET_TERM_ENABLE_SET(val, 0x0);
serdes_wr(ctx, lane, RXTX_REG12, val);
/* Set period error latch to 512T and enable BWL */
serdes_rd(ctx, lane, RXTX_REG26, &val);
val = RXTX_REG26_PERIOD_ERROR_LATCH_SET(val, 0x0);
val = RXTX_REG26_BLWC_ENA_SET(val, 0x1);
serdes_wr(ctx, lane, RXTX_REG26, val);
serdes_wr(ctx, lane, RXTX_REG28, 0x0);
/* Set DFE loop preset value */
serdes_wr(ctx, lane, RXTX_REG31, 0x0);
/* Set Eye Monitor counter width to 12-bit */
serdes_rd(ctx, lane, RXTX_REG61, &val);
val = RXTX_REG61_ISCAN_INBERT_SET(val, 0x1);
val = RXTX_REG61_LOADFREQ_SHIFT_SET(val, 0x0);
val = RXTX_REG61_EYE_COUNT_WIDTH_SEL_SET(val, 0x0);
serdes_wr(ctx, lane, RXTX_REG61, val);
/* Set BW select tap X for DFE loop */ for (i = 0; i < 9; i++) {
reg = RXTX_REG81 + i * 2;
serdes_rd(ctx, lane, reg, &val);
val = RXTX_REG89_MU_TH7_SET(val, 0xe);
val = RXTX_REG89_MU_TH8_SET(val, 0xe);
val = RXTX_REG89_MU_TH9_SET(val, 0xe);
serdes_wr(ctx, lane, reg, val);
}
/* Set BW select tap X for frequency adjust loop */ for (i = 0; i < 3; i++) {
reg = RXTX_REG96 + i * 2;
serdes_rd(ctx, lane, reg, &val);
val = RXTX_REG96_MU_FREQ1_SET(val, 0x10);
val = RXTX_REG96_MU_FREQ2_SET(val, 0x10);
val = RXTX_REG96_MU_FREQ3_SET(val, 0x10);
serdes_wr(ctx, lane, reg, val);
}
/* Set BW select tap X for phase adjust loop */ for (i = 0; i < 3; i++) {
reg = RXTX_REG99 + i * 2;
serdes_rd(ctx, lane, reg, &val);
val = RXTX_REG99_MU_PHASE1_SET(val, 0x7);
val = RXTX_REG99_MU_PHASE2_SET(val, 0x7);
val = RXTX_REG99_MU_PHASE3_SET(val, 0x7);
serdes_wr(ctx, lane, reg, val);
}
serdes_rd(ctx, lane, RXTX_REG145, &val);
val = RXTX_REG145_RXDFE_CONFIG_SET(val, 0x3);
val = RXTX_REG145_TX_IDLE_SATA_SET(val, 0x0); if (preA3Chip) {
val = RXTX_REG145_RXES_ENA_SET(val, 0x1);
val = RXTX_REG145_RXVWES_LATENA_SET(val, 0x1);
} else {
val = RXTX_REG145_RXES_ENA_SET(val, 0x0);
val = RXTX_REG145_RXVWES_LATENA_SET(val, 0x0);
}
serdes_wr(ctx, lane, RXTX_REG145, val);
/* * Set Rx LOS filter clock rate, sample rate, and threshold * windows
*/ for (i = 0; i < 4; i++) {
reg = RXTX_REG148 + i * 2;
serdes_wr(ctx, lane, reg, 0xFFFF);
}
}
}
/* Release PHY main reset */
writel(0xdf, csr_serdes + SATA_ENET_SDS_RST_CTL);
readl(csr_serdes + SATA_ENET_SDS_RST_CTL); /* Force a barrier */
if (cmu_type != REF_CMU) {
cmu_setbits(ctx, cmu_type, CMU_REG5, CMU_REG5_PLL_RESETB_MASK); /* * As per PHY design spec, the PLL reset requires a minimum * of 800us.
*/
usleep_range(800, 1000);
cmu_rd(ctx, cmu_type, CMU_REG1, &val);
val = CMU_REG1_PLL_MANUALCAL_SET(val, 0x0);
cmu_wr(ctx, cmu_type, CMU_REG1, val); /* * As per PHY design spec, the PLL auto calibration requires * a minimum of 800us.
*/
usleep_range(800, 1000);
cmu_toggle1to0(ctx, cmu_type, CMU_REG32,
CMU_REG32_FORCE_VCOCAL_START_MASK); /* * As per PHY design spec, the PLL requires a minimum of * 800us to settle.
*/
usleep_range(800, 1000);
}
if (!preA3Chip) goto skip_manual_cal;
/* * Configure the termination resister calibration * The serial receive pins, RXP/RXN, have TERMination resistor * that is required to be calibrated.
*/
cmu_rd(ctx, cmu_type, CMU_REG17, &val);
val = CMU_REG17_PVT_CODE_R2A_SET(val, 0x12);
val = CMU_REG17_RESERVED_7_SET(val, 0x0);
cmu_wr(ctx, cmu_type, CMU_REG17, val);
cmu_toggle1to0(ctx, cmu_type, CMU_REG17,
CMU_REG17_PVT_TERM_MAN_ENA_MASK); /* * The serial transmit pins, TXP/TXN, have Pull-UP and Pull-DOWN * resistors that are required to the calibrated. * Configure the pull DOWN calibration
*/
cmu_rd(ctx, cmu_type, CMU_REG17, &val);
val = CMU_REG17_PVT_CODE_R2A_SET(val, 0x29);
val = CMU_REG17_RESERVED_7_SET(val, 0x0);
cmu_wr(ctx, cmu_type, CMU_REG17, val);
cmu_toggle1to0(ctx, cmu_type, CMU_REG16,
CMU_REG16_PVT_DN_MAN_ENA_MASK); /* Configure the pull UP calibration */
cmu_rd(ctx, cmu_type, CMU_REG17, &val);
val = CMU_REG17_PVT_CODE_R2A_SET(val, 0x28);
val = CMU_REG17_RESERVED_7_SET(val, 0x0);
cmu_wr(ctx, cmu_type, CMU_REG17, val);
cmu_toggle1to0(ctx, cmu_type, CMU_REG16,
CMU_REG16_PVT_UP_MAN_ENA_MASK);
skip_manual_cal: /* Poll the PLL calibration completion status for at least 1 ms */
loop = 100; do {
cmu_rd(ctx, cmu_type, CMU_REG7, &val); if (CMU_REG7_PLL_CALIB_DONE_RD(val)) break; /* * As per PHY design spec, PLL calibration status requires * a minimum of 10us to be updated.
*/
usleep_range(10, 100);
} while (--loop > 0);
staticint xgene_phy_hw_init_sata(struct xgene_phy_ctx *ctx, enum clk_type_t clk_type, int ssc_enable)
{ void __iomem *sds_base = ctx->sds_base;
u32 val; int i;
/* Configure the PHY for operation */
dev_dbg(ctx->dev, "Reset PHY\n"); /* Place PHY into reset */
writel(0x0, sds_base + SATA_ENET_SDS_RST_CTL);
val = readl(sds_base + SATA_ENET_SDS_RST_CTL); /* Force a barrier */ /* Release PHY lane from reset (active high) */
writel(0x20, sds_base + SATA_ENET_SDS_RST_CTL);
readl(sds_base + SATA_ENET_SDS_RST_CTL); /* Force a barrier */ /* Release all PHY module out of reset except PHY main reset */
writel(0xde, sds_base + SATA_ENET_SDS_RST_CTL);
readl(sds_base + SATA_ENET_SDS_RST_CTL); /* Force a barrier */
/* Set the operation speed */
val = readl(sds_base + SATA_ENET_SDS_CTL1);
val = CFG_I_SPD_SEL_CDR_OVR1_SET(val,
ctx->sata_param.txspeed[ctx->sata_param.speed[0]]);
writel(val, sds_base + SATA_ENET_SDS_CTL1);
dev_dbg(ctx->dev, "Set the customer pin mode to SATA\n");
val = readl(sds_base + SATA_ENET_SDS_CTL0);
val = REGSPEC_CFG_I_CUSTOMER_PIN_MODE0_SET(val, 0x4421);
writel(val, sds_base + SATA_ENET_SDS_CTL0);
/* Configure the clock macro unit (CMU) clock type */
xgene_phy_cfg_cmu_clk_type(ctx, PHY_CMU, clk_type);
/* Configure the clock macro */
xgene_phy_sata_cfg_cmu_core(ctx, PHY_CMU, clk_type);
/* Enable SSC if enabled */ if (ssc_enable)
xgene_phy_ssc_enable(ctx, PHY_CMU);
/* Set Rx/Tx 20-bit */
val = readl(sds_base + SATA_ENET_SDS_PCS_CTL0);
val = REGSPEC_CFG_I_RX_WORDMODE0_SET(val, 0x3);
val = REGSPEC_CFG_I_TX_WORDMODE0_SET(val, 0x3);
writel(val, sds_base + SATA_ENET_SDS_PCS_CTL0);
/* Start PLL calibration and try for three times */
i = 10; do { if (!xgene_phy_cal_rdy_chk(ctx, PHY_CMU, clk_type)) break; /* If failed, toggle the VCO power signal and start again */
xgene_phy_pdwn_force_vco(ctx, PHY_CMU, clk_type);
} while (--i > 0); /* Even on failure, allow to continue any way */ if (i <= 0)
dev_err(ctx->dev, "PLL calibration failed\n");
return 0;
}
staticint xgene_phy_hw_initialize(struct xgene_phy_ctx *ctx, enum clk_type_t clk_type, int ssc_enable)
{ int rc;
dev_dbg(ctx->dev, "PHY init clk type %d\n", clk_type);
/* Start SUMMER calibration */
serdes_setbits(ctx, lane, RXTX_REG127,
RXTX_REG127_FORCE_SUM_CAL_START_MASK); /* * As per PHY design spec, the Summer calibration requires a minimum * of 100us to complete.
*/
usleep_range(100, 500);
serdes_clrbits(ctx, lane, RXTX_REG127,
RXTX_REG127_FORCE_SUM_CAL_START_MASK); /* * As per PHY design spec, the auto calibration requires a minimum * of 100us to complete.
*/
usleep_range(100, 500);
/* Start latch calibration */
serdes_setbits(ctx, lane, RXTX_REG127,
RXTX_REG127_FORCE_LAT_CAL_START_MASK); /* * As per PHY design spec, the latch calibration requires a minimum * of 100us to complete.
*/
usleep_range(100, 500);
serdes_clrbits(ctx, lane, RXTX_REG127,
RXTX_REG127_FORCE_LAT_CAL_START_MASK);
/* Configure the PHY lane for calibration */
serdes_wr(ctx, lane, RXTX_REG28, 0x7);
serdes_wr(ctx, lane, RXTX_REG31, 0x7e00);
serdes_clrbits(ctx, lane, RXTX_REG4,
RXTX_REG4_TX_LOOPBACK_BUF_EN_MASK);
serdes_clrbits(ctx, lane, RXTX_REG7,
RXTX_REG7_LOOP_BACK_ENA_CTLE_MASK); for (i = 0; i < ARRAY_SIZE(serdes_reg); i++)
serdes_wr(ctx, lane, serdes_reg[i].reg,
serdes_reg[i].val);
}
staticvoid xgene_phy_reset_rxd(struct xgene_phy_ctx *ctx, int lane)
{ /* Reset digital Rx */
serdes_clrbits(ctx, lane, RXTX_REG7, RXTX_REG7_RESETB_RXD_MASK); /* As per PHY design spec, the reset requires a minimum of 100us. */
usleep_range(100, 150);
serdes_setbits(ctx, lane, RXTX_REG7, RXTX_REG7_RESETB_RXD_MASK);
}
staticvoid xgene_phy_gen_avg_val(struct xgene_phy_ctx *ctx, int lane)
{ int max_loop = 10; int avg_loop = 0; int lat_do = 0, lat_xo = 0, lat_eo = 0, lat_so = 0; int lat_de = 0, lat_xe = 0, lat_ee = 0, lat_se = 0; int sum_cal = 0; int lat_do_itr, lat_xo_itr, lat_eo_itr, lat_so_itr; int lat_de_itr, lat_xe_itr, lat_ee_itr, lat_se_itr; int sum_cal_itr; int fail_even; int fail_odd;
u32 val;
dev_dbg(ctx->dev, "Generating avg calibration value for lane %d\n",
lane);
/* Enable RX Hi-Z termination */
serdes_setbits(ctx, lane, RXTX_REG12,
RXTX_REG12_RX_DET_TERM_ENABLE_MASK); /* Turn off DFE */
serdes_wr(ctx, lane, RXTX_REG28, 0x0000); /* DFE Presets to zero */
serdes_wr(ctx, lane, RXTX_REG31, 0x0000);
/* * Receiver Offset Calibration: * Calibrate the receiver signal path offset in two steps - summar * and latch calibration. * Runs the "Receiver Offset Calibration multiple times to determine * the average value to use.
*/ while (avg_loop < max_loop) { /* Start the calibration */
xgene_phy_force_lat_summer_cal(ctx, lane);
/* Setup clock properly after PHY configuration */ if (!IS_ERR(ctx->clk)) { /* HW requires an toggle of the clock */
clk_prepare_enable(ctx->clk);
clk_disable_unprepare(ctx->clk);
clk_prepare_enable(ctx->clk);
}
/* Compute average value */ for (i = 0; i < MAX_LANE; i++)
xgene_phy_gen_avg_val(ctx, i);
if (args->args_count <= 0) return ERR_PTR(-EINVAL); if (args->args[0] >= MODE_MAX) return ERR_PTR(-EINVAL);
ctx->mode = args->args[0]; return ctx->phy;
}
staticvoid xgene_phy_get_param(struct platform_device *pdev, constchar *name, u32 *buffer, int count, u32 *default_val,
u32 conv_factor)
{ int i;
if (!of_property_read_u32_array(pdev->dev.of_node, name, buffer,
count)) { for (i = 0; i < count; i++)
buffer[i] /= conv_factor; return;
} /* Does not exist, load default */ for (i = 0; i < count; i++)
buffer[i] = default_val[i % 3];
}
Die Informationen auf dieser Webseite wurden
nach bestem Wissen sorgfältig zusammengestellt. Es wird jedoch weder Vollständigkeit, noch Richtigkeit,
noch Qualität der bereit gestellten Informationen zugesichert.
Bemerkung:
Die farbliche Syntaxdarstellung und die Messung sind noch experimentell.