[OpenWrt-Devel] [PATCH v2] ar71xx: add support for qca955x sgmii/serdes calibration

[Chris Blake]

This patch is to add support for sgmii/serdes calibration from within the
OpenWRT environment. This is needed on boards that do not use u-boot or do
not have a pre-init process that runs calibration.

Signed-off-by: Chris R Blake <chrisrblake93 at gmail.com>

---

diff -rupN
a/target/linux/ar71xx/patches-4.1/743-MIPS-ath79-add-qca955x-mac-sgmii-calibration.patch
b/target/linux/ar71xx/patches-4.1/743-MIPS-ath79-add-qca955x-mac-sgmii-calibration.patch
---
a/target/linux/ar71xx/patches-4.1/743-MIPS-ath79-add-qca955x-mac-sgmii-calibration.patch
1969-12-31 18:00:00.000000000 -0600
+++
b/target/linux/ar71xx/patches-4.1/743-MIPS-ath79-add-qca955x-mac-sgmii-calibration.patch
2015-09-17 07:49:54.000000000 -0500
@@ -0,0 +1,82 @@
+--- a/arch/mips/include/asm/mach-ath79/ar71xx_regs.h 2015-08-05
12:58:15.580496899 +0200
++++ b/arch/mips/include/asm/mach-ath79/ar71xx_regs.h 2015-08-05
13:52:32.590857293 +0200
+@@ -360,6 +360,7 @@
+ #define QCA955X_PLL_CLK_CTRL_REG 0x08
+ #define QCA955X_PLL_ETH_XMII_CONTROL_REG 0x28
+ #define QCA955X_PLL_ETH_SGMII_CONTROL_REG 0x48
++#define QCA955X_PLL_ETH_SGMII_SERDES_REG 0x4c
+
+ #define QCA955X_PLL_CPU_CONFIG_NFRAC_SHIFT 0
+ #define QCA955X_PLL_CPU_CONFIG_NFRAC_MASK 0x3f
+@@ -392,6 +393,10 @@
+ #define QCA955X_PLL_CLK_CTRL_DDRCLK_FROM_DDRPLL BIT(21)
+ #define QCA955X_PLL_CLK_CTRL_AHBCLK_FROM_DDRPLL BIT(24)
+
++#define QCA955X_PLL_ETH_SGMII_SERDES_LOCK_DETECT BIT(2)
++#define QCA955X_PLL_ETH_SGMII_SERDES_PLL_REFCLK BIT(1)
++#define QCA955X_PLL_ETH_SGMII_SERDES_EN_PLL BIT(0)
++
+ #define QCA956X_PLL_CPU_CONFIG_REG 0x00
+ #define QCA956X_PLL_CPU_CONFIG1_REG 0x04
+ #define QCA956X_PLL_DDR_CONFIG_REG 0x08
+@@ -1104,5 +1109,11 @@
+ #define QCA955X_ETH_CFG_RDV_DELAY BIT(16)
+ #define QCA955X_ETH_CFG_RDV_DELAY_MASK 0x3
+ #define QCA955X_ETH_CFG_RDV_DELAY_SHIFT 16
++
++#define QCA955X_GMAC_REG_SGMII_SERDES 0x0018
++#define QCA955X_SGMII_SERDES_RES_CALIBRATION BIT(23)
++#define QCA955X_SGMII_SERDES_RES_CALIBRATION_MASK 0xf
++#define QCA955X_SGMII_SERDES_RES_CALIBRATION_SHIFT 23
++#define QCA955X_SGMII_SERDES_LOCK_DETECT_STATUS BIT(15)
+
+ #endif /* __ASM_MACH_AR71XX_REGS_H */
+--- a/arch/mips/ath79/dev-eth.c 2015-08-05 14:17:25.757504251 +0200
++++ b/arch/mips/ath79/dev-eth.c 2015-08-05 14:09:54.716333554 +0200
+@@ -849,6 +849,37 @@ void __init ath79_setup_qca955x_eth_rx_d
+ iounmap(base);
+ }
+
++void __init ath79_setup_qca955x_eth_serdes_cal(unsigned int sgmii_value)
++{
++ void __iomem *ethbase, *pllbase;
++ u32 t;
++
++ ethbase = ioremap_nocache(QCA955X_GMAC_BASE, QCA955X_GMAC_SIZE);
++ pllbase = ioremap_nocache(AR71XX_PLL_BASE, AR71XX_PLL_SIZE);
++
++ /* To Check the locking of the SGMII PLL */
++ t = __raw_readl(ethbase + QCA955X_GMAC_REG_SGMII_SERDES);
++ t &= ~(QCA955X_SGMII_SERDES_RES_CALIBRATION_MASK <<
++       QCA955X_SGMII_SERDES_RES_CALIBRATION_SHIFT);
++ t |= (sgmii_value & QCA955X_SGMII_SERDES_RES_CALIBRATION_MASK) <<
++     QCA955X_SGMII_SERDES_RES_CALIBRATION_SHIFT;
++ __raw_writel(t, ethbase + QCA955X_GMAC_REG_SGMII_SERDES);
++
++ __raw_writel(QCA955X_PLL_ETH_SGMII_SERDES_LOCK_DETECT |
++     QCA955X_PLL_ETH_SGMII_SERDES_PLL_REFCLK |
++     QCA955X_PLL_ETH_SGMII_SERDES_EN_PLL,
++     pllbase + QCA955X_PLL_ETH_SGMII_SERDES_REG);
++
++ ath79_device_reset_clear(QCA955X_RESET_SGMII_ANALOG);
++ ath79_device_reset_clear(QCA955X_RESET_SGMII);
++
++ while (!(__raw_readl(ethbase + QCA955X_GMAC_REG_SGMII_SERDES) &
++ QCA955X_SGMII_SERDES_LOCK_DETECT_STATUS));
++
++ iounmap(ethbase);
++ iounmap(pllbase);
++}
++
+ static int ath79_eth_instance __initdata;
+ void __init ath79_register_eth(unsigned int id)
+ {
+--- a/arch/mips/ath79/dev-eth.h 2015-08-05 14:17:25.757504251 +0200
++++ b/arch/mips/ath79/dev-eth.h 2015-08-05 13:58:20.292866210 +0200
+@@ -50,5 +50,6 @@ void ath79_setup_ar934x_eth_cfg(u32 mask
+ void ath79_setup_ar934x_eth_rx_delay(unsigned int rxd, unsigned int rxdv);
+ void ath79_setup_qca955x_eth_cfg(u32 mask);
+ void ath79_setup_qca955x_eth_rx_delay(unsigned int rxd, unsigned int
rxdv);
++void ath79_setup_qca955x_eth_serdes_cal(unsigned int sgmii_value);
+
+ #endif /* _ATH79_DEV_ETH_H */
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.infradead.org/pipermail/openwrt-devel/attachments/20150917/e8155cc1/attachment.htm>
-------------- next part --------------
_______________________________________________
openwrt-devel mailing list
openwrt-devel at lists.openwrt.org
https://lists.openwrt.org/cgi-bin/mailman/listinfo/openwrt-devel