2010-10-09 04:47:52 +07:00
|
|
|
/*
|
|
|
|
* This file is subject to the terms and conditions of the GNU General Public
|
|
|
|
* License. See the file "COPYING" in the main directory of this archive
|
|
|
|
* for more details.
|
|
|
|
*
|
2011-04-28 00:54:20 +07:00
|
|
|
* Copyright (C) 2010, 2011 Cavium Networks
|
2010-10-09 04:47:52 +07:00
|
|
|
*/
|
|
|
|
|
|
|
|
#include <linux/module.h>
|
2011-04-28 00:54:20 +07:00
|
|
|
#include <linux/mutex.h>
|
2010-10-09 04:47:52 +07:00
|
|
|
#include <linux/delay.h>
|
|
|
|
|
|
|
|
#include <asm/octeon/octeon.h>
|
|
|
|
#include <asm/octeon/cvmx-uctlx-defs.h>
|
|
|
|
|
2011-04-28 00:54:20 +07:00
|
|
|
static DEFINE_MUTEX(octeon2_usb_clocks_mutex);
|
|
|
|
|
|
|
|
static int octeon2_usb_clock_start_cnt;
|
2010-10-09 04:47:52 +07:00
|
|
|
|
|
|
|
void octeon2_usb_clocks_start(void)
|
|
|
|
{
|
|
|
|
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;
|
|
|
|
|
2011-04-28 00:54:20 +07:00
|
|
|
|
|
|
|
mutex_lock(&octeon2_usb_clocks_mutex);
|
|
|
|
|
|
|
|
octeon2_usb_clock_start_cnt++;
|
|
|
|
if (octeon2_usb_clock_start_cnt != 1)
|
|
|
|
goto exit;
|
2010-10-09 04:47:52 +07:00
|
|
|
|
|
|
|
io_clk_64_to_ns = 64000000000ull / octeon_get_io_clock_rate();
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Step 1: Wait for voltages stable. That surely happened
|
|
|
|
* before starting the kernel.
|
|
|
|
*
|
|
|
|
* Step 2: Enable SCLK of UCTL by writing UCTL0_IF_ENA[EN] = 1
|
|
|
|
*/
|
|
|
|
if_ena.u64 = 0;
|
|
|
|
if_ena.s.en = 1;
|
|
|
|
cvmx_write_csr(CVMX_UCTLX_IF_ENA(0), if_ena.u64);
|
|
|
|
|
|
|
|
/* Step 3: Configure the reference clock, PHY, and HCLK */
|
|
|
|
clk_rst_ctl.u64 = cvmx_read_csr(CVMX_UCTLX_CLK_RST_CTL(0));
|
2011-04-28 00:54:20 +07:00
|
|
|
|
|
|
|
/*
|
|
|
|
* If the UCTL looks like it has already been started, skip
|
|
|
|
* the initialization, otherwise bus errors are obtained.
|
|
|
|
*/
|
|
|
|
if (clk_rst_ctl.s.hrst)
|
|
|
|
goto end_clock;
|
2010-10-09 04:47:52 +07:00
|
|
|
/* 3a */
|
|
|
|
clk_rst_ctl.s.p_por = 1;
|
|
|
|
clk_rst_ctl.s.hrst = 0;
|
|
|
|
clk_rst_ctl.s.p_prst = 0;
|
|
|
|
clk_rst_ctl.s.h_clkdiv_rst = 0;
|
|
|
|
clk_rst_ctl.s.o_clkdiv_rst = 0;
|
|
|
|
clk_rst_ctl.s.h_clkdiv_en = 0;
|
|
|
|
clk_rst_ctl.s.o_clkdiv_en = 0;
|
|
|
|
cvmx_write_csr(CVMX_UCTLX_CLK_RST_CTL(0), clk_rst_ctl.u64);
|
|
|
|
|
|
|
|
/* 3b */
|
|
|
|
/* 12MHz crystal. */
|
|
|
|
clk_rst_ctl.s.p_refclk_sel = 0;
|
|
|
|
clk_rst_ctl.s.p_refclk_div = 0;
|
|
|
|
cvmx_write_csr(CVMX_UCTLX_CLK_RST_CTL(0), clk_rst_ctl.u64);
|
|
|
|
|
|
|
|
/* 3c */
|
|
|
|
div = octeon_get_io_clock_rate() / 130000000ull;
|
|
|
|
|
|
|
|
switch (div) {
|
|
|
|
case 0:
|
|
|
|
div = 1;
|
|
|
|
break;
|
|
|
|
case 1:
|
|
|
|
case 2:
|
|
|
|
case 3:
|
|
|
|
case 4:
|
|
|
|
break;
|
|
|
|
case 5:
|
|
|
|
div = 4;
|
|
|
|
break;
|
|
|
|
case 6:
|
|
|
|
case 7:
|
|
|
|
div = 6;
|
|
|
|
break;
|
|
|
|
case 8:
|
|
|
|
case 9:
|
|
|
|
case 10:
|
|
|
|
case 11:
|
|
|
|
div = 8;
|
|
|
|
break;
|
|
|
|
default:
|
|
|
|
div = 12;
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
clk_rst_ctl.s.h_div = div;
|
|
|
|
cvmx_write_csr(CVMX_UCTLX_CLK_RST_CTL(0), clk_rst_ctl.u64);
|
|
|
|
/* Read it back, */
|
|
|
|
clk_rst_ctl.u64 = cvmx_read_csr(CVMX_UCTLX_CLK_RST_CTL(0));
|
|
|
|
clk_rst_ctl.s.h_clkdiv_en = 1;
|
|
|
|
cvmx_write_csr(CVMX_UCTLX_CLK_RST_CTL(0), clk_rst_ctl.u64);
|
|
|
|
/* 3d */
|
|
|
|
clk_rst_ctl.s.h_clkdiv_rst = 1;
|
|
|
|
cvmx_write_csr(CVMX_UCTLX_CLK_RST_CTL(0), clk_rst_ctl.u64);
|
|
|
|
|
|
|
|
/* 3e: delay 64 io clocks */
|
|
|
|
ndelay(io_clk_64_to_ns);
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Step 4: Program the power-on reset field in the UCTL
|
|
|
|
* clock-reset-control register.
|
|
|
|
*/
|
|
|
|
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 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);
|
|
|
|
|
|
|
|
/* Step 10: Configure the OHCI_CLK48 and OHCI_CLK12 clocks. */
|
|
|
|
/* 10a */
|
|
|
|
clk_rst_ctl.s.o_clkdiv_rst = 1;
|
|
|
|
cvmx_write_csr(CVMX_UCTLX_CLK_RST_CTL(0), clk_rst_ctl.u64);
|
|
|
|
|
|
|
|
/* 10b */
|
|
|
|
clk_rst_ctl.s.o_clkdiv_en = 1;
|
|
|
|
cvmx_write_csr(CVMX_UCTLX_CLK_RST_CTL(0), clk_rst_ctl.u64);
|
|
|
|
|
|
|
|
/* 10c */
|
|
|
|
ndelay(io_clk_64_to_ns);
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Step 11: Program the PHY reset field:
|
|
|
|
* UCTL0_CLK_RST_CTL[P_PRST] = 1
|
|
|
|
*/
|
|
|
|
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);
|
|
|
|
|
|
|
|
/* Step 13: Program the HRESET_N field: UCTL0_CLK_RST_CTL[HRST] = 1 */
|
|
|
|
clk_rst_ctl.s.hrst = 1;
|
|
|
|
cvmx_write_csr(CVMX_UCTLX_CLK_RST_CTL(0), clk_rst_ctl.u64);
|
|
|
|
|
2011-04-28 00:54:20 +07:00
|
|
|
end_clock:
|
2010-10-09 04:47:52 +07:00
|
|
|
/* 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));
|
2011-04-28 00:54:21 +07:00
|
|
|
/* Set txvreftune to 15 to obtain compliant 'eye' diagram. */
|
2010-10-09 04:47:52 +07:00
|
|
|
port_ctl_status.s.txvreftune = 15;
|
2011-04-28 00:54:21 +07:00
|
|
|
port_ctl_status.s.txrisetune = 1;
|
|
|
|
port_ctl_status.s.txpreemphasistune = 1;
|
2010-10-09 04:47:52 +07:00
|
|
|
cvmx_write_csr(CVMX_UCTLX_UPHY_PORTX_CTL_STATUS(i, 0),
|
|
|
|
port_ctl_status.u64);
|
|
|
|
}
|
2011-04-28 00:54:22 +07:00
|
|
|
|
|
|
|
/* Set uSOF cycle period to 60,000 bits. */
|
|
|
|
cvmx_write_csr(CVMX_UCTLX_EHCI_FLA(0), 0x20ull);
|
2011-04-28 00:54:20 +07:00
|
|
|
exit:
|
|
|
|
mutex_unlock(&octeon2_usb_clocks_mutex);
|
2010-10-09 04:47:52 +07:00
|
|
|
}
|
|
|
|
EXPORT_SYMBOL(octeon2_usb_clocks_start);
|
|
|
|
|
|
|
|
void octeon2_usb_clocks_stop(void)
|
|
|
|
{
|
2011-04-28 00:54:20 +07:00
|
|
|
mutex_lock(&octeon2_usb_clocks_mutex);
|
|
|
|
octeon2_usb_clock_start_cnt--;
|
|
|
|
mutex_unlock(&octeon2_usb_clocks_mutex);
|
2010-10-09 04:47:52 +07:00
|
|
|
}
|
|
|
|
EXPORT_SYMBOL(octeon2_usb_clocks_stop);
|