From b2e4c7b94e2826bea435aa3107e7c44f3e68515b Mon Sep 17 00:00:00 2001 From: Mark Langsdorf Date: Wed, 14 Aug 2013 13:23:31 -0500 Subject: [PATCH] sata, highbank: set tx_atten override bits Some board designs do not drive the SATA transmit lines within the specification. The ECME can provide override settings, on a per board basis, to bring the transmit lines within spec. Read those settings from the DTB and program them in. At the time of submission, no production hardware requires this patch. Signed-off-by: Mark Langsdorf Signed-off-by: Tejun Heo --- .../devicetree/bindings/ata/sata_highbank.txt | 4 ++ drivers/ata/sata_highbank.c | 58 ++++++++++++++----- 2 files changed, 49 insertions(+), 13 deletions(-) diff --git a/Documentation/devicetree/bindings/ata/sata_highbank.txt b/Documentation/devicetree/bindings/ata/sata_highbank.txt index e7a6f2864f8b..c84833e13363 100644 --- a/Documentation/devicetree/bindings/ata/sata_highbank.txt +++ b/Documentation/devicetree/bindings/ata/sata_highbank.txt @@ -20,6 +20,9 @@ Optional properties: indicator lights using the indicated GPIOs - calxeda,led-order : a u32 array that map port numbers to offsets within the SGPIO bitstream. +- calxeda,tx-atten : a u32 array that contains TX attenuation override + codes, one per port. The upper 3 bytes are always + 0 and thus ignored. Example: sata@ffe08000 { @@ -31,4 +34,5 @@ Example: &combophy0 2 &combophy0 3>; calxeda,sgpio-gpio =<&gpioh 5 1 &gpioh 6 1 &gpioh 7 1>; calxeda,led-order = <4 0 1 2 3>; + calxeda,tx-atten = <0xff 22 0xff 0xff 23>; }; diff --git a/drivers/ata/sata_highbank.c b/drivers/ata/sata_highbank.c index 5eb93de75e43..ba43c7217545 100644 --- a/drivers/ata/sata_highbank.c +++ b/drivers/ata/sata_highbank.c @@ -46,14 +46,19 @@ #define CR_BUSY 0x0001 #define CR_START 0x0001 #define CR_WR_RDN 0x0002 +#define CPHY_TX_INPUT_STS 0x2001 #define CPHY_RX_INPUT_STS 0x2002 -#define CPHY_SATA_OVERRIDE 0x4000 -#define CPHY_OVERRIDE 0x2005 +#define CPHY_SATA_TX_OVERRIDE 0x8000 +#define CPHY_SATA_RX_OVERRIDE 0x4000 +#define CPHY_TX_OVERRIDE 0x2004 +#define CPHY_RX_OVERRIDE 0x2005 #define SPHY_LANE 0x100 #define SPHY_HALF_RATE 0x0001 #define CPHY_SATA_DPLL_MODE 0x0700 #define CPHY_SATA_DPLL_SHIFT 8 #define CPHY_SATA_DPLL_RESET (1 << 11) +#define CPHY_SATA_TX_ATTEN 0x1c00 +#define CPHY_SATA_TX_ATTEN_SHIFT 10 #define CPHY_PHY_COUNT 6 #define CPHY_LANE_COUNT 4 #define CPHY_PORT_COUNT (CPHY_PHY_COUNT * CPHY_LANE_COUNT) @@ -66,6 +71,7 @@ struct phy_lane_info { void __iomem *phy_base; u8 lane_mapping; u8 phy_devs; + u8 tx_atten; }; static struct phy_lane_info port_data[CPHY_PORT_COUNT]; @@ -76,7 +82,6 @@ static DEFINE_SPINLOCK(sgpio_lock); #define SGPIO_PINS 3 #define SGPIO_PORTS 8 -/* can be cast as an ahci_host_priv for compatibility with most functions */ struct ecx_plat_data { u32 n_ports; unsigned sgpio_gpio[SGPIO_PINS]; @@ -259,8 +264,27 @@ static void highbank_cphy_disable_overrides(u8 sata_port) if (unlikely(port_data[sata_port].phy_base == NULL)) return; tmp = combo_phy_read(sata_port, CPHY_RX_INPUT_STS + lane * SPHY_LANE); - tmp &= ~CPHY_SATA_OVERRIDE; - combo_phy_write(sata_port, CPHY_OVERRIDE + lane * SPHY_LANE, tmp); + tmp &= ~CPHY_SATA_RX_OVERRIDE; + combo_phy_write(sata_port, CPHY_RX_OVERRIDE + lane * SPHY_LANE, tmp); +} + +static void cphy_override_tx_attenuation(u8 sata_port, u32 val) +{ + u8 lane = port_data[sata_port].lane_mapping; + u32 tmp; + + if (val & 0x8) + return; + + tmp = combo_phy_read(sata_port, CPHY_TX_INPUT_STS + lane * SPHY_LANE); + tmp &= ~CPHY_SATA_TX_OVERRIDE; + combo_phy_write(sata_port, CPHY_TX_OVERRIDE + lane * SPHY_LANE, tmp); + + tmp |= CPHY_SATA_TX_OVERRIDE; + combo_phy_write(sata_port, CPHY_TX_OVERRIDE + lane * SPHY_LANE, tmp); + + tmp |= (val << CPHY_SATA_TX_ATTEN_SHIFT) & CPHY_SATA_TX_ATTEN; + combo_phy_write(sata_port, CPHY_TX_OVERRIDE + lane * SPHY_LANE, tmp); } static void cphy_override_rx_mode(u8 sata_port, u32 val) @@ -268,21 +292,21 @@ static void cphy_override_rx_mode(u8 sata_port, u32 val) u8 lane = port_data[sata_port].lane_mapping; u32 tmp; tmp = combo_phy_read(sata_port, CPHY_RX_INPUT_STS + lane * SPHY_LANE); - tmp &= ~CPHY_SATA_OVERRIDE; - combo_phy_write(sata_port, CPHY_OVERRIDE + lane * SPHY_LANE, tmp); + tmp &= ~CPHY_SATA_RX_OVERRIDE; + combo_phy_write(sata_port, CPHY_RX_OVERRIDE + lane * SPHY_LANE, tmp); - tmp |= CPHY_SATA_OVERRIDE; - combo_phy_write(sata_port, CPHY_OVERRIDE + lane * SPHY_LANE, tmp); + tmp |= CPHY_SATA_RX_OVERRIDE; + combo_phy_write(sata_port, CPHY_RX_OVERRIDE + lane * SPHY_LANE, tmp); tmp &= ~CPHY_SATA_DPLL_MODE; tmp |= val << CPHY_SATA_DPLL_SHIFT; - combo_phy_write(sata_port, CPHY_OVERRIDE + lane * SPHY_LANE, tmp); + combo_phy_write(sata_port, CPHY_RX_OVERRIDE + lane * SPHY_LANE, tmp); tmp |= CPHY_SATA_DPLL_RESET; - combo_phy_write(sata_port, CPHY_OVERRIDE + lane * SPHY_LANE, tmp); + combo_phy_write(sata_port, CPHY_RX_OVERRIDE + lane * SPHY_LANE, tmp); tmp &= ~CPHY_SATA_DPLL_RESET; - combo_phy_write(sata_port, CPHY_OVERRIDE + lane * SPHY_LANE, tmp); + combo_phy_write(sata_port, CPHY_RX_OVERRIDE + lane * SPHY_LANE, tmp); msleep(15); } @@ -299,16 +323,20 @@ static void highbank_cphy_override_lane(u8 sata_port) lane * SPHY_LANE); } while ((tmp & SPHY_HALF_RATE) && (k++ < 1000)); cphy_override_rx_mode(sata_port, 3); + cphy_override_tx_attenuation(sata_port, port_data[sata_port].tx_atten); } static int highbank_initialize_phys(struct device *dev, void __iomem *addr) { struct device_node *sata_node = dev->of_node; - int phy_count = 0, phy, port = 0; + int phy_count = 0, phy, port = 0, i; void __iomem *cphy_base[CPHY_PHY_COUNT]; struct device_node *phy_nodes[CPHY_PHY_COUNT]; + u32 tx_atten[CPHY_PORT_COUNT]; + memset(port_data, 0, sizeof(struct phy_lane_info) * CPHY_PORT_COUNT); memset(phy_nodes, 0, sizeof(struct device_node*) * CPHY_PHY_COUNT); + memset(tx_atten, 0xff, CPHY_PORT_COUNT); do { u32 tmp; @@ -336,6 +364,10 @@ static int highbank_initialize_phys(struct device *dev, void __iomem *addr) of_node_put(phy_data.np); port += 1; } while (port < CPHY_PORT_COUNT); + of_property_read_u32_array(sata_node, "calxeda,tx-atten", + tx_atten, port); + for (i = 0; i < port; i++) + port_data[i].tx_atten = (u8) tx_atten[i]; return 0; } -- 2.20.1