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ata: add platform driver for Calxeda AHCI controller
Calxeda highbank SATA phy has intermittent problems bringing up a link with Gen3 drives. Retrying the phy hard reset can work-around this issue, but each reset also disables spread spectrum support. The reset function also needs to reprogram the phy to enable spread spectrum support. Create a new driver based on ahci_platform to support the Calxeda Highbank SATA controller. Signed-off-by: Mark Langsdorf <mark.langsdorf@calxeda.com> Signed-off-by: Rob Herring <rob.herring@calxeda.com> Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
This commit is contained in:
Mark Langsdorf
Jeff Garzik
parent
100f586bd0
commit
8996b89d6b
7 changed files with 501 additions and 1 deletions
17
Documentation/devicetree/bindings/arm/calxeda/combophy.txt
Normal file
17
Documentation/devicetree/bindings/arm/calxeda/combophy.txt
Normal file
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@ -0,0 +1,17 @@
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Calxeda Highbank Combination Phys for SATA
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Properties:
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- compatible : Should be "calxeda,hb-combophy"
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- #phy-cells: Should be 1.
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- reg : Address and size for Combination Phy registers.
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- phydev: device ID for programming the combophy.
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Example:
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combophy5: combo-phy@fff5d000 {
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compatible = "calxeda,hb-combophy";
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#phy-cells = <1>;
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reg = <0xfff5d000 0x1000>;
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phydev = <31>;
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};
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@ -8,9 +8,17 @@ Required properties:
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- interrupts : <interrupt mapping for SATA IRQ>
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- reg : <registers mapping>
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Optional properties:
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- calxeda,port-phys: phandle-combophy and lane assignment, which maps each
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SATA port to a combophy and a lane within that
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combophy
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Example:
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sata@ffe08000 {
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compatible = "calxeda,hb-ahci";
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reg = <0xffe08000 0x1000>;
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interrupts = <115>;
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calxeda,port-phys = <&combophy5 0 &combophy0 0 &combophy0 1
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&combophy0 2 &combophy0 3>;
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};
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@ -121,6 +121,9 @@ sata@ffe08000 {
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compatible = "calxeda,hb-ahci";
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reg = <0xffe08000 0x10000>;
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interrupts = <0 83 4>;
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calxeda,port-phys = <&combophy5 0 &combophy0 0
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&combophy0 1 &combophy0 2
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&combophy0 3>;
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};
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sdhci@ffe0e000 {
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@ -306,5 +309,19 @@ ethernet@fff51000 {
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reg = <0xfff51000 0x1000>;
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interrupts = <0 80 4 0 81 4 0 82 4>;
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};
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combophy0: combo-phy@fff58000 {
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compatible = "calxeda,hb-combophy";
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#phy-cells = <1>;
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reg = <0xfff58000 0x1000>;
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phydev = <5>;
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};
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combophy5: combo-phy@fff5d000 {
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compatible = "calxeda,hb-combophy";
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#phy-cells = <1>;
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reg = <0xfff5d000 0x1000>;
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phydev = <31>;
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};
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};
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};
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@ -214,6 +214,14 @@ config SATA_DWC_VDEBUG
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help
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This option enables the taskfile dumping and NCQ debugging.
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config SATA_HIGHBANK
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tristate "Calxeda Highbank SATA support"
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help
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This option enables support for the Calxeda Highbank SoC's
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onboard SATA.
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If unsure, say N.
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config SATA_MV
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tristate "Marvell SATA support"
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help
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@ -9,6 +9,7 @@ obj-$(CONFIG_SATA_FSL) += sata_fsl.o
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obj-$(CONFIG_SATA_INIC162X) += sata_inic162x.o
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obj-$(CONFIG_SATA_SIL24) += sata_sil24.o
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obj-$(CONFIG_SATA_DWC) += sata_dwc_460ex.o
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obj-$(CONFIG_SATA_HIGHBANK) += sata_highbank.o
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# SFF w/ custom DMA
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obj-$(CONFIG_PDC_ADMA) += pdc_adma.o
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@ -277,7 +277,6 @@ static int ahci_resume(struct device *dev)
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SIMPLE_DEV_PM_OPS(ahci_pm_ops, ahci_suspend, ahci_resume);
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static const struct of_device_id ahci_of_match[] = {
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{ .compatible = "calxeda,hb-ahci", },
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{ .compatible = "snps,spear-ahci", },
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{},
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};
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450
drivers/ata/sata_highbank.c
Normal file
450
drivers/ata/sata_highbank.c
Normal file
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@ -0,0 +1,450 @@
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/*
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* Calxeda Highbank AHCI SATA platform driver
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* Copyright 2012 Calxeda, Inc.
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*
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* based on the AHCI SATA platform driver by Jeff Garzik and Anton Vorontsov
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License along with
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* this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <linux/kernel.h>
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#include <linux/gfp.h>
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/types.h>
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#include <linux/err.h>
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#include <linux/io.h>
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#include <linux/spinlock.h>
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#include <linux/device.h>
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#include <linux/of_device.h>
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#include <linux/of_address.h>
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#include <linux/platform_device.h>
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#include <linux/libata.h>
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#include <linux/ahci_platform.h>
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#include <linux/interrupt.h>
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#include <linux/delay.h>
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#include <linux/export.h>
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#include "ahci.h"
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#define CPHY_MAP(dev, addr) ((((dev) & 0x1f) << 7) | (((addr) >> 9) & 0x7f))
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#define CPHY_ADDR(addr) (((addr) & 0x1ff) << 2)
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#define SERDES_CR_CTL 0x80a0
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#define SERDES_CR_ADDR 0x80a1
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#define SERDES_CR_DATA 0x80a2
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#define CR_BUSY 0x0001
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#define CR_START 0x0001
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#define CR_WR_RDN 0x0002
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#define CPHY_RX_INPUT_STS 0x2002
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#define CPHY_SATA_OVERRIDE 0x4000
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#define CPHY_OVERRIDE 0x2005
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#define SPHY_LANE 0x100
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#define SPHY_HALF_RATE 0x0001
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#define CPHY_SATA_DPLL_MODE 0x0700
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#define CPHY_SATA_DPLL_SHIFT 8
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#define CPHY_SATA_DPLL_RESET (1 << 11)
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#define CPHY_PHY_COUNT 6
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#define CPHY_LANE_COUNT 4
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#define CPHY_PORT_COUNT (CPHY_PHY_COUNT * CPHY_LANE_COUNT)
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static DEFINE_SPINLOCK(cphy_lock);
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/* Each of the 6 phys can have up to 4 sata ports attached to i. Map 0-based
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* sata ports to their phys and then to their lanes within the phys
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*/
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struct phy_lane_info {
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void __iomem *phy_base;
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u8 lane_mapping;
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u8 phy_devs;
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};
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static struct phy_lane_info port_data[CPHY_PORT_COUNT];
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static u32 __combo_phy_reg_read(u8 sata_port, u32 addr)
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{
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u32 data;
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u8 dev = port_data[sata_port].phy_devs;
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spin_lock(&cphy_lock);
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writel(CPHY_MAP(dev, addr), port_data[sata_port].phy_base + 0x800);
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data = readl(port_data[sata_port].phy_base + CPHY_ADDR(addr));
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spin_unlock(&cphy_lock);
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return data;
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}
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static void __combo_phy_reg_write(u8 sata_port, u32 addr, u32 data)
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{
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u8 dev = port_data[sata_port].phy_devs;
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spin_lock(&cphy_lock);
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writel(CPHY_MAP(dev, addr), port_data[sata_port].phy_base + 0x800);
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writel(data, port_data[sata_port].phy_base + CPHY_ADDR(addr));
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spin_unlock(&cphy_lock);
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}
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static void combo_phy_wait_for_ready(u8 sata_port)
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{
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while (__combo_phy_reg_read(sata_port, SERDES_CR_CTL) & CR_BUSY)
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udelay(5);
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}
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static u32 combo_phy_read(u8 sata_port, u32 addr)
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{
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combo_phy_wait_for_ready(sata_port);
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__combo_phy_reg_write(sata_port, SERDES_CR_ADDR, addr);
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__combo_phy_reg_write(sata_port, SERDES_CR_CTL, CR_START);
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combo_phy_wait_for_ready(sata_port);
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return __combo_phy_reg_read(sata_port, SERDES_CR_DATA);
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}
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static void combo_phy_write(u8 sata_port, u32 addr, u32 data)
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{
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combo_phy_wait_for_ready(sata_port);
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__combo_phy_reg_write(sata_port, SERDES_CR_ADDR, addr);
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__combo_phy_reg_write(sata_port, SERDES_CR_DATA, data);
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__combo_phy_reg_write(sata_port, SERDES_CR_CTL, CR_WR_RDN | CR_START);
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}
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static void highbank_cphy_disable_overrides(u8 sata_port)
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{
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u8 lane = port_data[sata_port].lane_mapping;
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u32 tmp;
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if (unlikely(port_data[sata_port].phy_base == NULL))
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return;
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tmp = combo_phy_read(sata_port, CPHY_RX_INPUT_STS + lane * SPHY_LANE);
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tmp &= ~CPHY_SATA_OVERRIDE;
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combo_phy_write(sata_port, CPHY_OVERRIDE + lane * SPHY_LANE, tmp);
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}
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static void cphy_override_rx_mode(u8 sata_port, u32 val)
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{
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u8 lane = port_data[sata_port].lane_mapping;
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u32 tmp;
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tmp = combo_phy_read(sata_port, CPHY_RX_INPUT_STS + lane * SPHY_LANE);
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tmp &= ~CPHY_SATA_OVERRIDE;
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combo_phy_write(sata_port, CPHY_OVERRIDE + lane * SPHY_LANE, tmp);
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tmp |= CPHY_SATA_OVERRIDE;
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combo_phy_write(sata_port, CPHY_OVERRIDE + lane * SPHY_LANE, tmp);
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tmp &= ~CPHY_SATA_DPLL_MODE;
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tmp |= val << CPHY_SATA_DPLL_SHIFT;
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combo_phy_write(sata_port, CPHY_OVERRIDE + lane * SPHY_LANE, tmp);
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tmp |= CPHY_SATA_DPLL_RESET;
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combo_phy_write(sata_port, CPHY_OVERRIDE + lane * SPHY_LANE, tmp);
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tmp &= ~CPHY_SATA_DPLL_RESET;
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combo_phy_write(sata_port, CPHY_OVERRIDE + lane * SPHY_LANE, tmp);
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msleep(15);
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}
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static void highbank_cphy_override_lane(u8 sata_port)
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{
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u8 lane = port_data[sata_port].lane_mapping;
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u32 tmp, k = 0;
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if (unlikely(port_data[sata_port].phy_base == NULL))
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return;
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do {
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tmp = combo_phy_read(sata_port, CPHY_RX_INPUT_STS +
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lane * SPHY_LANE);
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} while ((tmp & SPHY_HALF_RATE) && (k++ < 1000));
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cphy_override_rx_mode(sata_port, 3);
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}
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static int highbank_initialize_phys(struct device *dev, void __iomem *addr)
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{
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struct device_node *sata_node = dev->of_node;
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int phy_count = 0, phy, port = 0;
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void __iomem *cphy_base[CPHY_PHY_COUNT];
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struct device_node *phy_nodes[CPHY_PHY_COUNT];
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memset(port_data, 0, sizeof(struct phy_lane_info) * CPHY_PORT_COUNT);
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memset(phy_nodes, 0, sizeof(struct device_node*) * CPHY_PHY_COUNT);
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do {
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u32 tmp;
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struct of_phandle_args phy_data;
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if (of_parse_phandle_with_args(sata_node,
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"calxeda,port-phys", "#phy-cells",
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port, &phy_data))
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break;
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for (phy = 0; phy < phy_count; phy++) {
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if (phy_nodes[phy] == phy_data.np)
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break;
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}
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if (phy_nodes[phy] == NULL) {
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phy_nodes[phy] = phy_data.np;
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cphy_base[phy] = of_iomap(phy_nodes[phy], 0);
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if (cphy_base[phy] == NULL) {
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return 0;
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}
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phy_count += 1;
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}
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port_data[port].lane_mapping = phy_data.args[0];
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of_property_read_u32(phy_nodes[phy], "phydev", &tmp);
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port_data[port].phy_devs = tmp;
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port_data[port].phy_base = cphy_base[phy];
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of_node_put(phy_data.np);
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port += 1;
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} while (port < CPHY_PORT_COUNT);
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return 0;
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}
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static int ahci_highbank_hardreset(struct ata_link *link, unsigned int *class,
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unsigned long deadline)
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{
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const unsigned long *timing = sata_ehc_deb_timing(&link->eh_context);
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struct ata_port *ap = link->ap;
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struct ahci_port_priv *pp = ap->private_data;
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u8 *d2h_fis = pp->rx_fis + RX_FIS_D2H_REG;
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struct ata_taskfile tf;
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bool online;
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u32 sstatus;
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int rc;
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int retry = 10;
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ahci_stop_engine(ap);
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/* clear D2H reception area to properly wait for D2H FIS */
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ata_tf_init(link->device, &tf);
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tf.command = 0x80;
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ata_tf_to_fis(&tf, 0, 0, d2h_fis);
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do {
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highbank_cphy_disable_overrides(link->ap->port_no);
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rc = sata_link_hardreset(link, timing, deadline, &online, NULL);
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highbank_cphy_override_lane(link->ap->port_no);
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/* If the status is 1, we are connected, but the link did not
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* come up. So retry resetting the link again.
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*/
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if (sata_scr_read(link, SCR_STATUS, &sstatus))
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break;
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if (!(sstatus & 0x3))
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break;
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} while (!online && retry--);
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ahci_start_engine(ap);
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if (online)
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*class = ahci_dev_classify(ap);
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return rc;
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}
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static struct ata_port_operations ahci_highbank_ops = {
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.inherits = &ahci_ops,
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.hardreset = ahci_highbank_hardreset,
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};
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static const struct ata_port_info ahci_highbank_port_info = {
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.flags = AHCI_FLAG_COMMON,
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.pio_mask = ATA_PIO4,
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.udma_mask = ATA_UDMA6,
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.port_ops = &ahci_highbank_ops,
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};
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static struct scsi_host_template ahci_highbank_platform_sht = {
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AHCI_SHT("highbank-ahci"),
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};
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static const struct of_device_id ahci_of_match[] = {
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{ .compatible = "calxeda,hb-ahci" },
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{},
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};
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MODULE_DEVICE_TABLE(of, ahci_of_match);
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static int __init ahci_highbank_probe(struct platform_device *pdev)
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{
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struct device *dev = &pdev->dev;
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struct ahci_host_priv *hpriv;
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struct ata_host *host;
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struct resource *mem;
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int irq;
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int n_ports;
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int i;
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int rc;
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struct ata_port_info pi = ahci_highbank_port_info;
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const struct ata_port_info *ppi[] = { &pi, NULL };
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mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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if (!mem) {
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dev_err(dev, "no mmio space\n");
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return -EINVAL;
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}
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irq = platform_get_irq(pdev, 0);
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if (irq <= 0) {
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dev_err(dev, "no irq\n");
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return -EINVAL;
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}
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hpriv = devm_kzalloc(dev, sizeof(*hpriv), GFP_KERNEL);
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if (!hpriv) {
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dev_err(dev, "can't alloc ahci_host_priv\n");
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return -ENOMEM;
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}
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hpriv->flags |= (unsigned long)pi.private_data;
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hpriv->mmio = devm_ioremap(dev, mem->start, resource_size(mem));
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if (!hpriv->mmio) {
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dev_err(dev, "can't map %pR\n", mem);
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return -ENOMEM;
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}
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rc = highbank_initialize_phys(dev, hpriv->mmio);
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if (rc)
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return rc;
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ahci_save_initial_config(dev, hpriv, 0, 0);
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/* prepare host */
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if (hpriv->cap & HOST_CAP_NCQ)
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pi.flags |= ATA_FLAG_NCQ;
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if (hpriv->cap & HOST_CAP_PMP)
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pi.flags |= ATA_FLAG_PMP;
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ahci_set_em_messages(hpriv, &pi);
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|
||||
/* CAP.NP sometimes indicate the index of the last enabled
|
||||
* port, at other times, that of the last possible port, so
|
||||
* determining the maximum port number requires looking at
|
||||
* both CAP.NP and port_map.
|
||||
*/
|
||||
n_ports = max(ahci_nr_ports(hpriv->cap), fls(hpriv->port_map));
|
||||
|
||||
host = ata_host_alloc_pinfo(dev, ppi, n_ports);
|
||||
if (!host) {
|
||||
rc = -ENOMEM;
|
||||
goto err0;
|
||||
}
|
||||
|
||||
host->private_data = hpriv;
|
||||
|
||||
if (!(hpriv->cap & HOST_CAP_SSS) || ahci_ignore_sss)
|
||||
host->flags |= ATA_HOST_PARALLEL_SCAN;
|
||||
|
||||
if (pi.flags & ATA_FLAG_EM)
|
||||
ahci_reset_em(host);
|
||||
|
||||
for (i = 0; i < host->n_ports; i++) {
|
||||
struct ata_port *ap = host->ports[i];
|
||||
|
||||
ata_port_desc(ap, "mmio %pR", mem);
|
||||
ata_port_desc(ap, "port 0x%x", 0x100 + ap->port_no * 0x80);
|
||||
|
||||
/* set enclosure management message type */
|
||||
if (ap->flags & ATA_FLAG_EM)
|
||||
ap->em_message_type = hpriv->em_msg_type;
|
||||
|
||||
/* disabled/not-implemented port */
|
||||
if (!(hpriv->port_map & (1 << i)))
|
||||
ap->ops = &ata_dummy_port_ops;
|
||||
}
|
||||
|
||||
rc = ahci_reset_controller(host);
|
||||
if (rc)
|
||||
goto err0;
|
||||
|
||||
ahci_init_controller(host);
|
||||
ahci_print_info(host, "platform");
|
||||
|
||||
rc = ata_host_activate(host, irq, ahci_interrupt, 0,
|
||||
&ahci_highbank_platform_sht);
|
||||
if (rc)
|
||||
goto err0;
|
||||
|
||||
return 0;
|
||||
err0:
|
||||
return rc;
|
||||
}
|
||||
|
||||
static int __devexit ahci_highbank_remove(struct platform_device *pdev)
|
||||
{
|
||||
struct device *dev = &pdev->dev;
|
||||
struct ata_host *host = dev_get_drvdata(dev);
|
||||
|
||||
ata_host_detach(host);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
#ifdef CONFIG_PM
|
||||
static int ahci_highbank_suspend(struct device *dev)
|
||||
{
|
||||
struct ata_host *host = dev_get_drvdata(dev);
|
||||
struct ahci_host_priv *hpriv = host->private_data;
|
||||
void __iomem *mmio = hpriv->mmio;
|
||||
u32 ctl;
|
||||
int rc;
|
||||
|
||||
if (hpriv->flags & AHCI_HFLAG_NO_SUSPEND) {
|
||||
dev_err(dev, "firmware update required for suspend/resume\n");
|
||||
return -EIO;
|
||||
}
|
||||
|
||||
/*
|
||||
* AHCI spec rev1.1 section 8.3.3:
|
||||
* Software must disable interrupts prior to requesting a
|
||||
* transition of the HBA to D3 state.
|
||||
*/
|
||||
ctl = readl(mmio + HOST_CTL);
|
||||
ctl &= ~HOST_IRQ_EN;
|
||||
writel(ctl, mmio + HOST_CTL);
|
||||
readl(mmio + HOST_CTL); /* flush */
|
||||
|
||||
rc = ata_host_suspend(host, PMSG_SUSPEND);
|
||||
if (rc)
|
||||
return rc;
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int ahci_highbank_resume(struct device *dev)
|
||||
{
|
||||
struct ata_host *host = dev_get_drvdata(dev);
|
||||
int rc;
|
||||
|
||||
if (dev->power.power_state.event == PM_EVENT_SUSPEND) {
|
||||
rc = ahci_reset_controller(host);
|
||||
if (rc)
|
||||
return rc;
|
||||
|
||||
ahci_init_controller(host);
|
||||
}
|
||||
|
||||
ata_host_resume(host);
|
||||
|
||||
return 0;
|
||||
}
|
||||
#endif
|
||||
|
||||
SIMPLE_DEV_PM_OPS(ahci_highbank_pm_ops,
|
||||
ahci_highbank_suspend, ahci_highbank_resume);
|
||||
|
||||
static struct platform_driver ahci_highbank_driver = {
|
||||
.remove = __devexit_p(ahci_highbank_remove),
|
||||
.driver = {
|
||||
.name = "highbank-ahci",
|
||||
.owner = THIS_MODULE,
|
||||
.of_match_table = ahci_of_match,
|
||||
.pm = &ahci_highbank_pm_ops,
|
||||
},
|
||||
.probe = ahci_highbank_probe,
|
||||
};
|
||||
|
||||
module_platform_driver(ahci_highbank_driver);
|
||||
|
||||
MODULE_DESCRIPTION("Calxeda Highbank AHCI SATA platform driver");
|
||||
MODULE_AUTHOR("Mark Langsdorf <mark.langsdorf@calxeda.com>");
|
||||
MODULE_LICENSE("GPL");
|
||||
MODULE_ALIAS("sata:highbank");
|
||||
Loading…
Reference in a new issue