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staging: mt7621-pci: use PERST_N instead of gpio control 

Driver is using gpio control instead of each port PERST_N
bit. Use PERST_N bit of each port cleaning all the ugly
gpio code in driver probe function.

Signed-off-by: Sergio Paracuellos <sergio.paracuellos@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Sergio Paracuellos 2018-11-04 11:49:54 +01:00 committed by Greg Kroah-Hartman
parent fb672b450c
commit bd1a05bd87
1 changed files with 24 additions and 22 deletions
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46
drivers/staging/mt7621-pci/pci-mt7621.c
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@ -18,6 +18,7 @@
#include <linux/bitops.h>
#include <linux/clk.h>
#include <linux/delay.h>
#include <linux/iopoll.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_address.h>
@ -36,7 +37,6 @@
#define MT7621_CHIP_REV_ID 0x0c
#define RALINK_CLKCFG1 0x30
#define RALINK_RSTCTRL 0x34
#define MT7621_GPIO_MODE 0x60
#define CHIP_REV_MT7621_E2 0x0101
/* RALINK_RSTCTRL bits */
@ -86,6 +86,8 @@
#define PCIE_BAR_ENABLE BIT(0)
#define PCIE_PORT_INT_EN(x) BIT(20 + (x))
#define PCIE_PORT_CLK_EN(x) BIT(24 + (x))
#define PCIE_PORT_PERST(x) BIT(1 + (x))
#define PCIE_PORT_LINKUP BIT(0)
#define PCIE_CLK_GEN_EN BIT(31)
#define PCIE_CLK_GEN_DIS 0
@ -638,12 +640,33 @@ static void mt7621_pcie_enable_ports(struct mt7621_pcie *pcie)
u32 offset;
u32 slot;
u32 val;
int err;
list_for_each_entry(port, &pcie->ports, list) {
slot = port->slot;
offset = MT7621_PCIE_OFFSET + (slot * MT7621_NEXT_PORT);
if (port->enabled) {
/* assert port PERST_N */
val = pcie_read(pcie, RALINK_PCI_PCICFG_ADDR);
val |= PCIE_PORT_PERST(slot);
pcie_write(pcie, val, RALINK_PCI_PCICFG_ADDR);
/* de-assert port PERST_N */
val = pcie_read(pcie, RALINK_PCI_PCICFG_ADDR);
val &= ~PCIE_PORT_PERST(slot);
pcie_write(pcie, val, RALINK_PCI_PCICFG_ADDR);
/* 100ms timeout value should be enough for Gen1 training */
err = readl_poll_timeout(port->base + RALINK_PCI_STATUS,
val,!!(val & PCIE_PORT_LINKUP),
20, 100 * USEC_PER_MSEC);
if (err) {
dev_err(dev, "de-assert port %d PERST_N\n",
slot);
continue;
}
/* map 2G DDR region */
pcie_write(pcie, PCIE_BAR_MAP_MAX | PCIE_BAR_ENABLE,
offset + RALINK_PCI_BAR0SETUP_ADDR);
@ -765,16 +788,6 @@ static int mt7621_pcie_register_host(struct pci_host_bridge *host,
return pci_host_probe(host);
}
static void mt7621_set_gpio_mode(struct mt7621_pcie *pcie)
{
u32 reg = ioread32(pcie->sysctl + MT7621_GPIO_MODE);
reg &= ~(0x3 << 10 | 0x3 << 3);
reg |= (BIT(10) | BIT(3));
iowrite32(reg, pcie->sysctl + MT7621_GPIO_MODE);
mdelay(100);
}
static int mt7621_pci_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
@ -807,13 +820,6 @@ static int mt7621_pci_probe(struct platform_device *pdev)
ioport_resource.start = 0;
ioport_resource.end = ~0UL; /* no limit */
mt7621_set_gpio_mode(pcie);
*(unsigned int *)(0xbe000600) |= BIT(19) | BIT(8) | BIT(7); // use GPIO19/GPIO8/GPIO7 (PERST_N/UART_RXD3/UART_TXD3)
mdelay(100);
*(unsigned int *)(0xbe000620) &= ~(BIT(19) | BIT(8) | BIT(7)); // clear DATA
mdelay(100);
mt7621_pcie_init_ports(pcie);
rt_sysc_m32(0, RALINK_PCIE_RST, RALINK_RSTCTRL);
@ -826,10 +832,6 @@ static int mt7621_pci_probe(struct platform_device *pdev)
mdelay(50);
rt_sysc_m32(RALINK_PCIE_RST, 0, RALINK_RSTCTRL);
/* Use GPIO control instead of PERST_N */
*(unsigned int *)(0xbe000620) |= BIT(19) | BIT(8) | BIT(7); // set DATA
mdelay(1000);
err = mt7621_pcie_init_virtual_bridges(pcie);
if (err) {
dev_err(dev, "Nothing is connected in virtual bridges. Exiting...");