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sh: pci: clock framework support for SH7786 PCIe. 

This gets each port handling its MSTP bit, as well as moving the PHY
clock management in to the clock framework.

Signed-off-by: Paul Mundt <lethal@linux-sh.org>
This commit is contained in:
Paul Mundt 2010-09-20 18:45:11 +09:00
parent cecf48e23f
commit c524ebf5a6
1 changed files with 86 additions and 21 deletions
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107
arch/sh/drivers/pci/pcie-sh7786.c
View File

@ -13,11 +13,15 @@
#include <linux/io.h>
#include <linux/delay.h>
#include <linux/slab.h>
#include <linux/clk.h>
#include <linux/sh_clk.h>
#include "pcie-sh7786.h"
#include <asm/sizes.h>
#include <asm/clock.h>
struct sh7786_pcie_port {
struct pci_channel *hose;
struct clk *fclk, phy_clk;
unsigned int index;
int endpoint;
int link;
@ -121,6 +125,10 @@ static struct pci_channel sh7786_pci_channels[] = {
DEFINE_CONTROLLER(0xfcc00000, 2),
};
static struct clk fixed_pciexclkp = {
.rate = 100000000, /* 100 MHz reference clock */
};
static void __devinit sh7786_pci_fixup(struct pci_dev *dev)
{
/*
@ -139,7 +147,7 @@ static void __devinit sh7786_pci_fixup(struct pci_dev *dev)
DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_RENESAS, PCI_DEVICE_ID_RENESAS_SH7786,
sh7786_pci_fixup);
static int phy_wait_for_ack(struct pci_channel *chan)
static int __init phy_wait_for_ack(struct pci_channel *chan)
{
unsigned int timeout = 100;
@ -153,7 +161,7 @@ static int phy_wait_for_ack(struct pci_channel *chan)
return -ETIMEDOUT;
}
static int pci_wait_for_irq(struct pci_channel *chan, unsigned int mask)
static int __init pci_wait_for_irq(struct pci_channel *chan, unsigned int mask)
{
unsigned int timeout = 100;
@ -167,8 +175,8 @@ static int pci_wait_for_irq(struct pci_channel *chan, unsigned int mask)
return -ETIMEDOUT;
}
static void phy_write_reg(struct pci_channel *chan, unsigned int addr,
unsigned int lane, unsigned int data)
static void __init phy_write_reg(struct pci_channel *chan, unsigned int addr,
unsigned int lane, unsigned int data)
{
unsigned long phyaddr;
@ -188,15 +196,67 @@ static void phy_write_reg(struct pci_channel *chan, unsigned int addr,
phy_wait_for_ack(chan);
}
static int phy_init(struct pci_channel *chan)
static int __init pcie_clk_init(struct sh7786_pcie_port *port)
{
unsigned long ctrl;
struct pci_channel *chan = port->hose;
struct clk *clk;
char fclk_name[16];
int ret;
/*
* First register the fixed clock
*/
ret = clk_register(&fixed_pciexclkp);
if (unlikely(ret != 0))
return ret;
/*
* Grab the port's function clock, which the PHY clock depends
* on. clock lookups don't help us much at this point, since no
* dev_id is available this early. Lame.
*/
snprintf(fclk_name, sizeof(fclk_name), "pcie%d_fck", port->index);
port->fclk = clk_get(NULL, fclk_name);
if (IS_ERR(port->fclk)) {
ret = PTR_ERR(port->fclk);
goto err_fclk;
}
clk_enable(port->fclk);
/*
* And now, set up the PHY clock
*/
clk = &port->phy_clk;
memset(clk, 0, sizeof(struct clk));
clk->parent = &fixed_pciexclkp;
clk->enable_reg = (void __iomem *)(chan->reg_base + SH4A_PCIEPHYCTLR);
clk->enable_bit = BITS_CKE;
ret = sh_clk_mstp32_register(clk, 1);
if (unlikely(ret < 0))
goto err_phy;
return 0;
err_phy:
clk_disable(port->fclk);
clk_put(port->fclk);
err_fclk:
clk_unregister(&fixed_pciexclkp);
return ret;
}
static int __init phy_init(struct sh7786_pcie_port *port)
{
struct pci_channel *chan = port->hose;
unsigned int timeout = 100;
/* Enable clock */
ctrl = pci_read_reg(chan, SH4A_PCIEPHYCTLR);
ctrl |= (1 << BITS_CKE);
pci_write_reg(chan, ctrl, SH4A_PCIEPHYCTLR);
clk_enable(&port->phy_clk);
/* Initialize the phy */
phy_write_reg(chan, 0x60, 0xf, 0x004b008b);
@ -212,9 +272,7 @@ static int phy_init(struct pci_channel *chan)
phy_write_reg(chan, 0x67, 0x1, 0x00000400);
/* Disable clock */
ctrl = pci_read_reg(chan, SH4A_PCIEPHYCTLR);
ctrl &= ~(1 << BITS_CKE);
pci_write_reg(chan, ctrl, SH4A_PCIEPHYCTLR);
clk_disable(&port->phy_clk);
while (timeout--) {
if (pci_read_reg(chan, SH4A_PCIEPHYSR))
@ -226,7 +284,7 @@ static int phy_init(struct pci_channel *chan)
return -ETIMEDOUT;
}
static void pcie_reset(struct sh7786_pcie_port *port)
static void __init pcie_reset(struct sh7786_pcie_port *port)
{
struct pci_channel *chan = port->hose;
@ -236,7 +294,7 @@ static void pcie_reset(struct sh7786_pcie_port *port)
pci_write_reg(chan, 0, SH4A_PCIETXVC0SR);
}
static int pcie_init(struct sh7786_pcie_port *port)
static int __init pcie_init(struct sh7786_pcie_port *port)
{
struct pci_channel *chan = port->hose;
unsigned int data;
@ -411,26 +469,33 @@ int __init pcibios_map_platform_irq(struct pci_dev *pdev, u8 slot, u8 pin)
return 71;
}
static int sh7786_pcie_core_init(void)
static int __init sh7786_pcie_core_init(void)
{
/* Return the number of ports */
return test_mode_pin(MODE_PIN12) ? 3 : 2;
}
static int __devinit sh7786_pcie_init_hw(struct sh7786_pcie_port *port)
static int __init sh7786_pcie_init_hw(struct sh7786_pcie_port *port)
{
int ret;
ret = phy_init(port->hose);
if (unlikely(ret < 0))
return ret;
/*
* Check if we are configured in endpoint or root complex mode,
* this is a fixed pin setting that applies to all PCIe ports.
*/
port->endpoint = test_mode_pin(MODE_PIN11);
/*
* Setup clocks, needed both for PHY and PCIe registers.
*/
ret = pcie_clk_init(port);
if (unlikely(ret < 0))
return ret;
ret = phy_init(port);
if (unlikely(ret < 0))
return ret;
ret = pcie_init(port);
if (unlikely(ret < 0))
return ret;