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driver_pcie2.c
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driver_pcie2.c
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/*
* Broadcom specific AMBA
* PCIe Gen 2 Core
*
* Copyright 2014, Broadcom Corporation
* Copyright 2014, Rafał Miłecki <[email protected]>
*
* Licensed under the GNU/GPL. See COPYING for details.
*/
#include "bcma_private.h"
#include <linux/bcma/bcma.h>
#include <linux/pci.h>
/**************************************************
* R/W ops.
**************************************************/
#if 0
static u32 bcma_core_pcie2_cfg_read(struct bcma_drv_pcie2 *pcie2, u32 addr)
{
pcie2_write32(pcie2, BCMA_CORE_PCIE2_CONFIGINDADDR, addr);
pcie2_read32(pcie2, BCMA_CORE_PCIE2_CONFIGINDADDR);
return pcie2_read32(pcie2, BCMA_CORE_PCIE2_CONFIGINDDATA);
}
#endif
static void bcma_core_pcie2_cfg_write(struct bcma_drv_pcie2 *pcie2, u32 addr,
u32 val)
{
pcie2_write32(pcie2, BCMA_CORE_PCIE2_CONFIGINDADDR, addr);
pcie2_write32(pcie2, BCMA_CORE_PCIE2_CONFIGINDDATA, val);
}
/**************************************************
* Init.
**************************************************/
static u32 bcma_core_pcie2_war_delay_perst_enab(struct bcma_drv_pcie2 *pcie2,
bool enable)
{
u32 val;
/* restore back to default */
val = pcie2_read32(pcie2, BCMA_CORE_PCIE2_CLK_CONTROL);
val |= PCIE2_CLKC_DLYPERST;
val &= ~PCIE2_CLKC_DISSPROMLD;
if (enable) {
val &= ~PCIE2_CLKC_DLYPERST;
val |= PCIE2_CLKC_DISSPROMLD;
}
pcie2_write32(pcie2, (BCMA_CORE_PCIE2_CLK_CONTROL), val);
/* flush */
return pcie2_read32(pcie2, BCMA_CORE_PCIE2_CLK_CONTROL);
}
static void bcma_core_pcie2_set_ltr_vals(struct bcma_drv_pcie2 *pcie2)
{
/* LTR0 */
pcie2_write32(pcie2, BCMA_CORE_PCIE2_CONFIGINDADDR, 0x844);
pcie2_write32(pcie2, BCMA_CORE_PCIE2_CONFIGINDDATA, 0x883c883c);
/* LTR1 */
pcie2_write32(pcie2, BCMA_CORE_PCIE2_CONFIGINDADDR, 0x848);
pcie2_write32(pcie2, BCMA_CORE_PCIE2_CONFIGINDDATA, 0x88648864);
/* LTR2 */
pcie2_write32(pcie2, BCMA_CORE_PCIE2_CONFIGINDADDR, 0x84C);
pcie2_write32(pcie2, BCMA_CORE_PCIE2_CONFIGINDDATA, 0x90039003);
}
static void bcma_core_pcie2_hw_ltr_war(struct bcma_drv_pcie2 *pcie2)
{
u8 core_rev = pcie2->core->id.rev;
u32 devstsctr2;
if (core_rev < 2 || core_rev == 10 || core_rev > 13)
return;
pcie2_write32(pcie2, BCMA_CORE_PCIE2_CONFIGINDADDR,
PCIE2_CAP_DEVSTSCTRL2_OFFSET);
devstsctr2 = pcie2_read32(pcie2, BCMA_CORE_PCIE2_CONFIGINDDATA);
if (devstsctr2 & PCIE2_CAP_DEVSTSCTRL2_LTRENAB) {
/* force the right LTR values */
bcma_core_pcie2_set_ltr_vals(pcie2);
/* TODO:
*si_core_wrapperreg(pcie2, 3, 0x60, 0x8080, 0);
*/
/* enable the LTR */
devstsctr2 |= PCIE2_CAP_DEVSTSCTRL2_LTRENAB;
pcie2_write32(pcie2, BCMA_CORE_PCIE2_CONFIGINDADDR,
PCIE2_CAP_DEVSTSCTRL2_OFFSET);
pcie2_write32(pcie2, BCMA_CORE_PCIE2_CONFIGINDDATA, devstsctr2);
/* set the LTR state to be active */
pcie2_write32(pcie2, BCMA_CORE_PCIE2_LTR_STATE,
PCIE2_LTR_ACTIVE);
usleep_range(1000, 2000);
/* set the LTR state to be sleep */
pcie2_write32(pcie2, BCMA_CORE_PCIE2_LTR_STATE,
PCIE2_LTR_SLEEP);
usleep_range(1000, 2000);
}
}
static void pciedev_crwlpciegen2(struct bcma_drv_pcie2 *pcie2)
{
u8 core_rev = pcie2->core->id.rev;
bool pciewar160, pciewar162;
pciewar160 = core_rev == 7 || core_rev == 9 || core_rev == 11;
pciewar162 = core_rev == 5 || core_rev == 7 || core_rev == 8 ||
core_rev == 9 || core_rev == 11;
if (!pciewar160 && !pciewar162)
return;
/* TODO */
#if 0
pcie2_set32(pcie2, BCMA_CORE_PCIE2_CLK_CONTROL,
PCIE_DISABLE_L1CLK_GATING);
#if 0
pcie2_write32(pcie2, BCMA_CORE_PCIE2_CONFIGINDADDR,
PCIEGEN2_COE_PVT_TL_CTRL_0);
pcie2_mask32(pcie2, BCMA_CORE_PCIE2_CONFIGINDDATA,
~(1 << COE_PVT_TL_CTRL_0_PM_DIS_L1_REENTRY_BIT));
#endif
#endif
}
static void pciedev_crwlpciegen2_180(struct bcma_drv_pcie2 *pcie2)
{
pcie2_write32(pcie2, BCMA_CORE_PCIE2_CONFIGINDADDR, PCIE2_PMCR_REFUP);
pcie2_set32(pcie2, BCMA_CORE_PCIE2_CONFIGINDDATA, 0x1f);
}
static void pciedev_crwlpciegen2_182(struct bcma_drv_pcie2 *pcie2)
{
pcie2_write32(pcie2, BCMA_CORE_PCIE2_CONFIGINDADDR, PCIE2_SBMBX);
pcie2_write32(pcie2, BCMA_CORE_PCIE2_CONFIGINDDATA, 1 << 0);
}
static void pciedev_reg_pm_clk_period(struct bcma_drv_pcie2 *pcie2)
{
struct bcma_drv_cc *drv_cc = &pcie2->core->bus->drv_cc;
u8 core_rev = pcie2->core->id.rev;
u32 alp_khz, pm_value;
if (core_rev <= 13) {
alp_khz = bcma_pmu_get_alp_clock(drv_cc) / 1000;
pm_value = (1000000 * 2) / alp_khz;
pcie2_write32(pcie2, BCMA_CORE_PCIE2_CONFIGINDADDR,
PCIE2_PVT_REG_PM_CLK_PERIOD);
pcie2_write32(pcie2, BCMA_CORE_PCIE2_CONFIGINDDATA, pm_value);
}
}
void bcma_core_pcie2_init(struct bcma_drv_pcie2 *pcie2)
{
struct bcma_bus *bus = pcie2->core->bus;
struct bcma_chipinfo *ci = &bus->chipinfo;
u32 tmp;
tmp = pcie2_read32(pcie2, BCMA_CORE_PCIE2_SPROM(54));
if ((tmp & 0xe) >> 1 == 2)
bcma_core_pcie2_cfg_write(pcie2, 0x4e0, 0x17);
switch (bus->chipinfo.id) {
case BCMA_CHIP_ID_BCM4360:
case BCMA_CHIP_ID_BCM4352:
pcie2->reqsize = 1024;
break;
default:
pcie2->reqsize = 128;
break;
}
if (ci->id == BCMA_CHIP_ID_BCM4360 && ci->rev > 3)
bcma_core_pcie2_war_delay_perst_enab(pcie2, true);
bcma_core_pcie2_hw_ltr_war(pcie2);
pciedev_crwlpciegen2(pcie2);
pciedev_reg_pm_clk_period(pcie2);
pciedev_crwlpciegen2_180(pcie2);
pciedev_crwlpciegen2_182(pcie2);
}
/**************************************************
* Runtime ops.
**************************************************/
void bcma_core_pcie2_up(struct bcma_drv_pcie2 *pcie2)
{
struct bcma_bus *bus = pcie2->core->bus;
struct pci_dev *dev = bus->host_pci;
int err;
err = pcie_set_readrq(dev, pcie2->reqsize);
if (err)
bcma_err(bus, "Error setting PCI_EXP_DEVCTL_READRQ: %d\n", err);
}