1 // SPDX-License-Identifier: GPL-2.0
3  * PCIe host controller driver for Mobiveil PCIe Host controller
18 #include "pcie-mobiveil.h"
21  * mobiveil_pcie_sel_page - routine to access paged register
28 static void mobiveil_pcie_sel_page(struct mobiveil_pcie *pcie, u8 pg_idx)  in mobiveil_pcie_sel_page()  argument
32 	val = readl(pcie->csr_axi_slave_base + PAB_CTRL);  in mobiveil_pcie_sel_page()
36 	writel(val, pcie->csr_axi_slave_base + PAB_CTRL);  in mobiveil_pcie_sel_page()
39 static void __iomem *mobiveil_pcie_comp_addr(struct mobiveil_pcie *pcie,  in mobiveil_pcie_comp_addr()  argument
44 		mobiveil_pcie_sel_page(pcie, 0);  in mobiveil_pcie_comp_addr()
45 		return pcie->csr_axi_slave_base + off;  in mobiveil_pcie_comp_addr()
48 	mobiveil_pcie_sel_page(pcie, OFFSET_TO_PAGE_IDX(off));  in mobiveil_pcie_comp_addr()
49 	return pcie->csr_axi_slave_base + OFFSET_TO_PAGE_ADDR(off);  in mobiveil_pcie_comp_addr()
54 	if ((uintptr_t)addr & (size - 1)) {  in mobiveil_pcie_read()
66 	case 1:  in mobiveil_pcie_read()
79 	if ((uintptr_t)addr & (size - 1))  in mobiveil_pcie_write()
89 	case 1:  in mobiveil_pcie_write()
99 u32 mobiveil_csr_read(struct mobiveil_pcie *pcie, u32 off, size_t size)  in mobiveil_csr_read()  argument
105 	addr = mobiveil_pcie_comp_addr(pcie, off);  in mobiveil_csr_read()
109 		dev_err(&pcie->pdev->dev, "read CSR address failed\n");  in mobiveil_csr_read()
114 void mobiveil_csr_write(struct mobiveil_pcie *pcie, u32 val, u32 off,  in mobiveil_csr_write()  argument
120 	addr = mobiveil_pcie_comp_addr(pcie, off);  in mobiveil_csr_write()
124 		dev_err(&pcie->pdev->dev, "write CSR address failed\n");  in mobiveil_csr_write()
127 bool mobiveil_pcie_link_up(struct mobiveil_pcie *pcie)  in mobiveil_pcie_link_up()  argument
129 	if (pcie->ops->link_up)  in mobiveil_pcie_link_up()
130 		return pcie->ops->link_up(pcie);  in mobiveil_pcie_link_up()
132 	return (mobiveil_csr_readl(pcie, LTSSM_STATUS) &  in mobiveil_pcie_link_up()
136 void program_ib_windows(struct mobiveil_pcie *pcie, int win_num,  in program_ib_windows()  argument
140 	u64 size64 = ~(size - 1);  in program_ib_windows()
142 	if (win_num >= pcie->ppio_wins) {  in program_ib_windows()
143 		dev_err(&pcie->pdev->dev,  in program_ib_windows()
148 	value = mobiveil_csr_readl(pcie, PAB_PEX_AMAP_CTRL(win_num));  in program_ib_windows()
150 	value |= type << AMAP_CTRL_TYPE_SHIFT | 1 << AMAP_CTRL_EN_SHIFT |  in program_ib_windows()
152 	mobiveil_csr_writel(pcie, value, PAB_PEX_AMAP_CTRL(win_num));  in program_ib_windows()
154 	mobiveil_csr_writel(pcie, upper_32_bits(size64),  in program_ib_windows()
157 	mobiveil_csr_writel(pcie, lower_32_bits(cpu_addr),  in program_ib_windows()
159 	mobiveil_csr_writel(pcie, upper_32_bits(cpu_addr),  in program_ib_windows()
162 	mobiveil_csr_writel(pcie, lower_32_bits(pci_addr),  in program_ib_windows()
164 	mobiveil_csr_writel(pcie, upper_32_bits(pci_addr),  in program_ib_windows()
167 	pcie->ib_wins_configured++;  in program_ib_windows()
173 void program_ob_windows(struct mobiveil_pcie *pcie, int win_num,  in program_ob_windows()  argument
177 	u64 size64 = ~(size - 1);  in program_ob_windows()
179 	if (win_num >= pcie->apio_wins) {  in program_ob_windows()
180 		dev_err(&pcie->pdev->dev,  in program_ob_windows()
186 	 * program Enable Bit to 1, Type Bit to (00) base 2, AXI Window Size Bit  in program_ob_windows()
189 	value = mobiveil_csr_readl(pcie, PAB_AXI_AMAP_CTRL(win_num));  in program_ob_windows()
191 	value |= 1 << WIN_ENABLE_SHIFT | type << WIN_TYPE_SHIFT |  in program_ob_windows()
193 	mobiveil_csr_writel(pcie, value, PAB_AXI_AMAP_CTRL(win_num));  in program_ob_windows()
195 	mobiveil_csr_writel(pcie, upper_32_bits(size64),  in program_ob_windows()
199 	 * program AXI window base with appropriate value in  in program_ob_windows()
202 	mobiveil_csr_writel(pcie,  in program_ob_windows()
205 	mobiveil_csr_writel(pcie, upper_32_bits(cpu_addr),  in program_ob_windows()
208 	mobiveil_csr_writel(pcie, lower_32_bits(pci_addr),  in program_ob_windows()
210 	mobiveil_csr_writel(pcie, upper_32_bits(pci_addr),  in program_ob_windows()
213 	pcie->ob_wins_configured++;  in program_ob_windows()
216 int mobiveil_bringup_link(struct mobiveil_pcie *pcie)  in mobiveil_bringup_link()  argument
222 		if (mobiveil_pcie_link_up(pcie))  in mobiveil_bringup_link()
228 	dev_err(&pcie->pdev->dev, "link never came up\n");  in mobiveil_bringup_link()
230 	return -ETIMEDOUT;  in mobiveil_bringup_link()