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author | Steven J. Hill <steven.hill@cavium.com> | 2016-07-26 10:26:26 -0500 |
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committer | Ralf Baechle <ralf@linux-mips.org> | 2016-07-28 12:01:53 +0200 |
commit | 7e78db997547470445c6e323a0b4b7a8c81f2baa (patch) | |
tree | 3f25972843162be0a017d23d6cf176e941a83f79 /arch/mips/cavium-octeon | |
parent | 8552b5b4da3191bdf73132958f62bab75837175c (diff) | |
download | linux-7e78db997547470445c6e323a0b4b7a8c81f2baa.tar.gz linux-7e78db997547470445c6e323a0b4b7a8c81f2baa.tar.bz2 linux-7e78db997547470445c6e323a0b4b7a8c81f2baa.zip |
MIPS: Octeon: Improve USB reset code for OCTEON II.
At boot time, do a better job of resetting the USB host controller
to make the frequency "eye" diagram more compliant with the USB
standard while making the controller more reliable.
Signed-off-by: Steven J. Hill <steven.hill@cavium.com>
Acked-by: David Daney <david.daney@cavium.com>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/13831/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Diffstat (limited to 'arch/mips/cavium-octeon')
-rw-r--r-- | arch/mips/cavium-octeon/octeon-platform.c | 108 |
1 files changed, 60 insertions, 48 deletions
diff --git a/arch/mips/cavium-octeon/octeon-platform.c b/arch/mips/cavium-octeon/octeon-platform.c index c9359fdae44b..eeda3739f55f 100644 --- a/arch/mips/cavium-octeon/octeon-platform.c +++ b/arch/mips/cavium-octeon/octeon-platform.c @@ -3,33 +3,27 @@ * License. See the file "COPYING" in the main directory of this archive * for more details. * - * Copyright (C) 2004-2011 Cavium Networks + * Copyright (C) 2004-2016 Cavium Networks * Copyright (C) 2008 Wind River Systems */ -#include <linux/delay.h> #include <linux/init.h> -#include <linux/irq.h> -#include <linux/i2c.h> -#include <linux/usb.h> -#include <linux/dma-mapping.h> +#include <linux/delay.h> #include <linux/etherdevice.h> -#include <linux/module.h> -#include <linux/mutex.h> -#include <linux/slab.h> -#include <linux/platform_device.h> #include <linux/of_platform.h> #include <linux/of_fdt.h> #include <linux/libfdt.h> +#include <linux/usb/ehci_def.h> #include <linux/usb/ehci_pdriver.h> #include <linux/usb/ohci_pdriver.h> #include <asm/octeon/octeon.h> -#include <asm/octeon/cvmx-rnm-defs.h> -#include <asm/octeon/cvmx-helper.h> #include <asm/octeon/cvmx-helper-board.h> #include <asm/octeon/cvmx-uctlx-defs.h> +#define CVMX_UAHCX_EHCI_USBCMD (CVMX_ADD_IO_SEG(0x00016F0000000010ull)) +#define CVMX_UAHCX_OHCI_USBCMD (CVMX_ADD_IO_SEG(0x00016F0000000408ull)) + /* Octeon Random Number Generator. */ static int __init octeon_rng_device_init(void) { @@ -78,12 +72,36 @@ static DEFINE_MUTEX(octeon2_usb_clocks_mutex); static int octeon2_usb_clock_start_cnt; +static int __init octeon2_usb_reset(void) +{ + union cvmx_uctlx_clk_rst_ctl clk_rst_ctl; + u32 ucmd; + + if (!OCTEON_IS_OCTEON2()) + return 0; + + clk_rst_ctl.u64 = cvmx_read_csr(CVMX_UCTLX_CLK_RST_CTL(0)); + if (clk_rst_ctl.s.hrst) { + ucmd = cvmx_read64_uint32(CVMX_UAHCX_EHCI_USBCMD); + ucmd &= ~CMD_RUN; + cvmx_write64_uint32(CVMX_UAHCX_EHCI_USBCMD, ucmd); + mdelay(2); + ucmd |= CMD_RESET; + cvmx_write64_uint32(CVMX_UAHCX_EHCI_USBCMD, ucmd); + ucmd = cvmx_read64_uint32(CVMX_UAHCX_OHCI_USBCMD); + ucmd |= CMD_RUN; + cvmx_write64_uint32(CVMX_UAHCX_OHCI_USBCMD, ucmd); + } + + return 0; +} +arch_initcall(octeon2_usb_reset); + static void octeon2_usb_clocks_start(struct device *dev) { u64 div; union cvmx_uctlx_if_ena if_ena; union cvmx_uctlx_clk_rst_ctl clk_rst_ctl; - union cvmx_uctlx_uphy_ctl_status uphy_ctl_status; union cvmx_uctlx_uphy_portx_ctl_status port_ctl_status; int i; unsigned long io_clk_64_to_ns; @@ -131,6 +149,17 @@ static void octeon2_usb_clocks_start(struct device *dev) if_ena.s.en = 1; cvmx_write_csr(CVMX_UCTLX_IF_ENA(0), if_ena.u64); + for (i = 0; i <= 1; i++) { + port_ctl_status.u64 = + cvmx_read_csr(CVMX_UCTLX_UPHY_PORTX_CTL_STATUS(i, 0)); + /* Set txvreftune to 15 to obtain compliant 'eye' diagram. */ + port_ctl_status.s.txvreftune = 15; + port_ctl_status.s.txrisetune = 1; + port_ctl_status.s.txpreemphasistune = 1; + cvmx_write_csr(CVMX_UCTLX_UPHY_PORTX_CTL_STATUS(i, 0), + port_ctl_status.u64); + } + /* Step 3: Configure the reference clock, PHY, and HCLK */ clk_rst_ctl.u64 = cvmx_read_csr(CVMX_UCTLX_CLK_RST_CTL(0)); @@ -218,29 +247,10 @@ static void octeon2_usb_clocks_start(struct device *dev) clk_rst_ctl.s.p_por = 0; cvmx_write_csr(CVMX_UCTLX_CLK_RST_CTL(0), clk_rst_ctl.u64); - /* Step 5: Wait 1 ms for the PHY clock to start. */ - mdelay(1); - - /* - * Step 6: Program the reset input from automatic test - * equipment field in the UPHY CSR - */ - uphy_ctl_status.u64 = cvmx_read_csr(CVMX_UCTLX_UPHY_CTL_STATUS(0)); - uphy_ctl_status.s.ate_reset = 1; - cvmx_write_csr(CVMX_UCTLX_UPHY_CTL_STATUS(0), uphy_ctl_status.u64); - - /* Step 7: Wait for at least 10ns. */ - ndelay(10); + /* Step 5: Wait 3 ms for the PHY clock to start. */ + mdelay(3); - /* Step 8: Clear the ATE_RESET field in the UPHY CSR. */ - uphy_ctl_status.s.ate_reset = 0; - cvmx_write_csr(CVMX_UCTLX_UPHY_CTL_STATUS(0), uphy_ctl_status.u64); - - /* - * Step 9: Wait for at least 20ns for UPHY to output PHY clock - * signals and OHCI_CLK48 - */ - ndelay(20); + /* Steps 6..9 for ATE only, are skipped. */ /* Step 10: Configure the OHCI_CLK48 and OHCI_CLK12 clocks. */ /* 10a */ @@ -261,6 +271,20 @@ static void octeon2_usb_clocks_start(struct device *dev) clk_rst_ctl.s.p_prst = 1; cvmx_write_csr(CVMX_UCTLX_CLK_RST_CTL(0), clk_rst_ctl.u64); + /* Step 11b */ + udelay(1); + + /* Step 11c */ + clk_rst_ctl.s.p_prst = 0; + cvmx_write_csr(CVMX_UCTLX_CLK_RST_CTL(0), clk_rst_ctl.u64); + + /* Step 11d */ + mdelay(1); + + /* Step 11e */ + clk_rst_ctl.s.p_prst = 1; + cvmx_write_csr(CVMX_UCTLX_CLK_RST_CTL(0), clk_rst_ctl.u64); + /* Step 12: Wait 1 uS. */ udelay(1); @@ -269,21 +293,9 @@ static void octeon2_usb_clocks_start(struct device *dev) cvmx_write_csr(CVMX_UCTLX_CLK_RST_CTL(0), clk_rst_ctl.u64); end_clock: - /* Now we can set some other registers. */ - - for (i = 0; i <= 1; i++) { - port_ctl_status.u64 = - cvmx_read_csr(CVMX_UCTLX_UPHY_PORTX_CTL_STATUS(i, 0)); - /* Set txvreftune to 15 to obtain compliant 'eye' diagram. */ - port_ctl_status.s.txvreftune = 15; - port_ctl_status.s.txrisetune = 1; - port_ctl_status.s.txpreemphasistune = 1; - cvmx_write_csr(CVMX_UCTLX_UPHY_PORTX_CTL_STATUS(i, 0), - port_ctl_status.u64); - } - /* Set uSOF cycle period to 60,000 bits. */ cvmx_write_csr(CVMX_UCTLX_EHCI_FLA(0), 0x20ull); + exit: mutex_unlock(&octeon2_usb_clocks_mutex); } |