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PCI: mobiveil: Make some register updates more readable 

To make some register updates more readable use a temporary
value to hold the register value and carry out the update.

Change the register update sequence to:

- Read out the original value from the target register
- Update the value
- Program the updated value back to the register

Signed-off-by: Hou Zhiqiang <Zhiqiang.Hou@nxp.com>
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Reviewed-by: Minghuan Lian <Minghuan.Lian@nxp.com>
This commit is contained in:
Hou Zhiqiang 2019-07-05 17:56:42 +08:00 committed by Lorenzo Pieralisi
parent e369faf625
commit 91347af1c5
1 changed files with 25 additions and 18 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

43
drivers/pci/controller/pcie-mobiveil.c
View File

@ -299,6 +299,7 @@ static void __iomem *mobiveil_pcie_map_bus(struct pci_bus *bus,
unsigned int devfn, int where)
{
struct mobiveil_pcie *pcie = bus->sysdata;
u32 value;
if (!mobiveil_pcie_valid_device(bus, devfn))
return NULL;
@ -313,10 +314,12 @@ static void __iomem *mobiveil_pcie_map_bus(struct pci_bus *bus,
* (BDF) in PAB_AXI_AMAP_PEX_WIN_L0 Register.
* Relies on pci_lock serialization
*/
csr_writel(pcie, bus->number << PAB_BUS_SHIFT |
PCI_SLOT(devfn) << PAB_DEVICE_SHIFT |
PCI_FUNC(devfn) << PAB_FUNCTION_SHIFT,
PAB_AXI_AMAP_PEX_WIN_L(WIN_NUM_0));
value = bus->number << PAB_BUS_SHIFT |
PCI_SLOT(devfn) << PAB_DEVICE_SHIFT |
PCI_FUNC(devfn) << PAB_FUNCTION_SHIFT;
csr_writel(pcie, value, PAB_AXI_AMAP_PEX_WIN_L(WIN_NUM_0));
return pcie->config_axi_slave_base + where;
}
@ -463,19 +466,20 @@ static void program_ib_windows(struct mobiveil_pcie *pcie, int win_num,
}
pio_ctrl_val = csr_readl(pcie, PAB_PEX_PIO_CTRL);
csr_writel(pcie, pio_ctrl_val | (1 << PIO_ENABLE_SHIFT),
PAB_PEX_PIO_CTRL);
amap_ctrl_dw = csr_readl(pcie, PAB_PEX_AMAP_CTRL(win_num));
amap_ctrl_dw = (amap_ctrl_dw | (type << AMAP_CTRL_TYPE_SHIFT));
amap_ctrl_dw = (amap_ctrl_dw | (1 << AMAP_CTRL_EN_SHIFT));
pio_ctrl_val |= 1 << PIO_ENABLE_SHIFT;
csr_writel(pcie, pio_ctrl_val, PAB_PEX_PIO_CTRL);
csr_writel(pcie, amap_ctrl_dw | lower_32_bits(size64),
PAB_PEX_AMAP_CTRL(win_num));
amap_ctrl_dw = csr_readl(pcie, PAB_PEX_AMAP_CTRL(win_num));
amap_ctrl_dw |= (type << AMAP_CTRL_TYPE_SHIFT) |
(1 << AMAP_CTRL_EN_SHIFT) |
lower_32_bits(size64);
csr_writel(pcie, amap_ctrl_dw, PAB_PEX_AMAP_CTRL(win_num));
csr_writel(pcie, upper_32_bits(size64),
PAB_EXT_PEX_AMAP_SIZEN(win_num));
csr_writel(pcie, pci_addr, PAB_PEX_AMAP_AXI_WIN(win_num));
csr_writel(pcie, pci_addr, PAB_PEX_AMAP_PEX_WIN_L(win_num));
csr_writel(pcie, 0, PAB_PEX_AMAP_PEX_WIN_H(win_num));
}
@ -575,16 +579,16 @@ static int mobiveil_host_init(struct mobiveil_pcie *pcie)
* Space
*/
value = csr_readl(pcie, PCI_COMMAND);
csr_writel(pcie, value | PCI_COMMAND_IO | PCI_COMMAND_MEMORY |
PCI_COMMAND_MASTER, PCI_COMMAND);
value |= PCI_COMMAND_IO | PCI_COMMAND_MEMORY | PCI_COMMAND_MASTER;
csr_writel(pcie, value, PCI_COMMAND);
/*
* program PIO Enable Bit to 1 (and PEX PIO Enable to 1) in PAB_CTRL
* register
*/
pab_ctrl = csr_readl(pcie, PAB_CTRL);
csr_writel(pcie, pab_ctrl | (1 << AMBA_PIO_ENABLE_SHIFT) |
(1 << PEX_PIO_ENABLE_SHIFT), PAB_CTRL);
pab_ctrl |= (1 << AMBA_PIO_ENABLE_SHIFT) | (1 << PEX_PIO_ENABLE_SHIFT);
csr_writel(pcie, pab_ctrl, PAB_CTRL);
csr_writel(pcie, (PAB_INTP_INTX_MASK | PAB_INTP_MSI_MASK),
PAB_INTP_AMBA_MISC_ENB);
@ -594,7 +598,8 @@ static int mobiveil_host_init(struct mobiveil_pcie *pcie)
* PAB_AXI_PIO_CTRL Register
*/
value = csr_readl(pcie, PAB_AXI_PIO_CTRL);
csr_writel(pcie, value | APIO_EN_MASK, PAB_AXI_PIO_CTRL);
value |= APIO_EN_MASK;
csr_writel(pcie, value, PAB_AXI_PIO_CTRL);
/*
* we'll program one outbound window for config reads and
@ -649,7 +654,8 @@ static void mobiveil_mask_intx_irq(struct irq_data *data)
mask = 1 << ((data->hwirq + PAB_INTX_START) - 1);
raw_spin_lock_irqsave(&pcie->intx_mask_lock, flags);
shifted_val = csr_readl(pcie, PAB_INTP_AMBA_MISC_ENB);
csr_writel(pcie, (shifted_val & (~mask)), PAB_INTP_AMBA_MISC_ENB);
shifted_val &= ~mask;
csr_writel(pcie, shifted_val, PAB_INTP_AMBA_MISC_ENB);
raw_spin_unlock_irqrestore(&pcie->intx_mask_lock, flags);
}
@ -664,7 +670,8 @@ static void mobiveil_unmask_intx_irq(struct irq_data *data)
mask = 1 << ((data->hwirq + PAB_INTX_START) - 1);
raw_spin_lock_irqsave(&pcie->intx_mask_lock, flags);
shifted_val = csr_readl(pcie, PAB_INTP_AMBA_MISC_ENB);
csr_writel(pcie, (shifted_val | mask), PAB_INTP_AMBA_MISC_ENB);
shifted_val |= mask;
csr_writel(pcie, shifted_val, PAB_INTP_AMBA_MISC_ENB);
raw_spin_unlock_irqrestore(&pcie->intx_mask_lock, flags);
}